JP4865879B2 - Pulse tube refrigerator - Google Patents

Description

  The present invention relates to a pulse tube refrigerator, and more particularly to a pulse tube refrigerator having a filter for removing abrasion powder.

  In recent years, cryogenic refrigerators are used to cool superconducting magnets to cryogenic temperatures in systems equipped with superconducting magnets such as a magnetic resonance imaging (MRI) apparatus. As the cryogenic refrigerator, for example, a refrigerator such as a Gifford-McMahon (GM) refrigerator or a pulse tube refrigerator is used. These refrigerators are regenerative refrigerators that perform refrigerating and cooling by adiabatically expanding refrigerant gas and storing cold heat generated at that time in a regenerator material.

  The regenerative refrigerator is a regenerative expander equipped with a regenerative tube that stores cold heat generated when the refrigerant gas adiabatically expands, collects the refrigerant gas from the regenerator expander, compresses the recovered refrigerant gas, And a compressor that supplies the compressed refrigerant gas to the regenerator-type expander again. The compressor includes a pipe on the suction side for sucking the collected refrigerant gas and on the discharge side for discharging the collected and compressed refrigerant gas. The regenerator tube is alternately communicated or cut off with the discharge side or the supply side of the compressor.

  A rotary valve is used as a valve for alternately connecting the regenerator tube to the discharge side or the supply side of the compressor. The rotary valve is for periodically communicating or blocking two pipes. The rotary valve includes a rotatable disk having communication holes for periodically switching between a communication state and a blocking state, and a fixed seal material for receiving the disk while sliding.

  However, the seal material is worn by sliding between the disc and the seal material, and wear powder is generated. Therefore, when the pulse tube refrigerator is operated for a long time, the wear powder flows into the regenerator tube, the regenerator material becomes dirty, and the refrigerating capacity is reduced. In such a case, the cold storage material must be replaced. In addition, when the wear powder is sucked into the compressor, the compression capacity of the compressor is lowered.

  Therefore, it is necessary to remove the abrasion powder generated in the rotary valve. In order to remove the abrasion powder, a removal method in which a filter is provided between the rotary valve and the cold storage tube has been performed. Patent Document 1 discloses an example of a pulse tube refrigerator in which filters are provided between a rotary valve and a regenerator tube and between a rotary valve and a pulse tube.

JP 2001-241793 A

  However, when operating a pulse tube refrigerator equipped with a filter for removing abrasion powder, there are the following problems.

  In the pulse tube refrigerator disclosed in Patent Document 1, although a partition member is provided between the filter and the regenerator tube and between the filter and the pulse tube, between the filter and the regenerator tube, In addition, the filter and the pulse tube cannot be easily separated while ensuring airtightness, and there is a problem that it takes time for maintenance work including separation work and filter replacement work. Specifically, before separation, the entire pulse tube refrigerator including the regenerator tube and pulse tube is heated to room temperature, the pulse tube refrigerator is disassembled and the filter is separated from the pulse tube refrigerator, and the separated filter After the maintenance work, such as replacement, is performed, the filter after the maintenance work is completed, the pulse tube refrigerator is reassembled, and the inside of the regenerator tube, the pulse tube and the pipe connecting them are mixed with the refrigerant gas. For example, replacement work with helium gas must be performed.

  Moreover, in the pulse tube refrigerator disclosed in Patent Document 1, since the partition portion is not provided on the compressor side of the filter, the filter and the compressor are easily separated while ensuring airtightness. There is a problem that it takes time for maintenance work including separation work and filter replacement work. Specifically, before separation, the filter is separated from the compressor, the filter is replaced, the filter is connected to the compressor, and the inside of the discharge side and suction side pipes of the compressor mixed with air is then connected to the refrigerant gas. For example, replacement work with helium gas must be performed.

  Furthermore, even if the above-described maintenance work can be easily performed, there is a problem that the entire pulse tube refrigerator including the valve unit and the expander must be downsized in order to be used in the MRI apparatus. there were.

  The present invention has been made in view of the above points, and is a filter that removes abrasion powder without performing a temperature raising operation for raising the temperature of the refrigerator to room temperature and a gas replacement operation for replacing the gas inside the refrigerator. An object of the present invention is to provide a pulse tube refrigerator and a regenerative refrigerator that can perform maintenance work.

  In order to solve the above-described problems, the present invention is characterized by the following measures.

  A pulse tube refrigerator according to a first aspect of the present invention is connected to a first pulse tube for adiabatically expanding a refrigerant gas and the first pulse tube, and the first pulse tube is adiabatically expanded with the refrigerant gas. A first regenerator tube for regenerating cold energy generated in the pulse tube, a compressor for compressing the refrigerant gas, a discharge side of the compressor and a high temperature end side of the first regenerator tube for communicating or blocking. Of the first regenerator tube through a first coupling point that is an intermediate point between the discharge side valve of the first discharge valve and the discharge side of the first discharge valve and the high temperature end side of the first regenerator tube. A first suction side valve coupled to the high temperature end side to communicate or block the high temperature end side of the first regenerative tube and the suction side of the compressor; the discharge side of the compressor; A first self-sealing joint provided between the discharge side valve of the first discharge side valve and the first suction side bar; The first self-sealing joint provided between the discharge side of the valve and the suction side of the compressor, the first pulse tube, and the first regenerator tube without raising the temperature to room temperature. In order to remove the wear powder around the first discharge side valve and the first suction side valve by separating the connection point between the first regenerator tube and the high temperature end side of the first regenerator tube, A third self-sealing joint provided so as to be separably connected between the first coupling point and the high temperature end side of the first regenerator tube; and a high temperature end side of the first pulse tube; A first buffer provided so as to be connected; a fourth self-sealing joint provided between the high-temperature end side of the first pulse tube and the first buffer; and the first discharge-side valve. And a valve unit for storing the first suction side valve, The first buffer, characterized in that it is stored in the valve unit.

  According to a second aspect of the present invention, in the pulse tube refrigerator according to the first aspect of the present invention, a second coupling point that is an intermediate point between the suction side of the first discharge side valve and the first self-sealing joint is provided. A second discharge side valve coupled to the discharge side of the compressor to communicate or block the discharge side of the compressor and the high temperature end side of the first pulse tube; and the first suction The high-pressure end side of the first pulse tube is coupled to the suction side of the compressor through a third coupling point that is an intermediate point between the discharge side of the side valve and the second self-sealing joint. And a second suction side valve for communicating or blocking between the suction side and the suction side of the compressor, and a discharge side of the second discharge side valve and the high temperature end side of the first pulse tube. A second self-sealing joint, and the second discharge side valve and the second suction side Lube is characterized in that it is stored in the valve unit.

  A third aspect of the present invention is the pulse tube refrigerator according to the second aspect, wherein the first buffer is an intermediate point between the discharge side of the second discharge side valve and the fifth self-seal joint. It is provided so as to be coupled to the high temperature end side of the first pulse tube through a fourth coupling point, and is provided between the fourth coupling point and the first buffer. It is characterized by having an orifice to be stored.

  4th invention is the pulse tube refrigerator which concerns on 3rd invention, The 2nd pulse tube for carrying out adiabatic expansion of the said refrigerant gas, the low temperature end side of the said 2nd pulse tube, and the said 1st cold storage A second regenerative tube provided between the low temperature end of the tube and a fifth coupling point that is an intermediate point between the suction side of the first discharge side valve and the first self-sealing joint. A third discharge side valve coupled to the discharge side of the compressor and communicating or blocking the discharge side of the compressor and the high temperature end side of the second pulse tube; and the first suction side Coupled to the suction side of the compressor through a sixth coupling point, which is an intermediate point between the discharge side of the valve and the second self-sealing joint, and the high temperature end side of the second pulse tube; A third suction side valve for communicating or blocking the suction side of the compressor; and the third discharge side bar. A sixth self-seal joint provided between the discharge side of the valve and the high temperature end side of the second pulse tube, and the third discharge side valve and the third suction side valve are It is stored in a valve unit.

  According to a fifth aspect of the present invention, in the pulse tube refrigerator according to the fourth aspect of the present invention, a seventh coupling point that is an intermediate point between the discharge side of the third discharge side valve and the sixth self-seal joint is provided. And a second buffer provided so as to be coupled to the high temperature end side of the second pulse tube, and the second buffer is stored in the valve unit.

  ADVANTAGE OF THE INVENTION According to this invention, the maintenance operation | work of the filter which removes abrasion powder can be performed, without performing the temperature rising operation which heats up a refrigerator to normal temperature, and the gas replacement operation which gas-replaces the inside of a refrigerator.

It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 1st modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 2nd modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 3rd modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 4th modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 5th modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 6th modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 7th modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 8th modification of the 1st Embodiment of this invention. It is a figure which shows typically the structure of the cool storage type refrigerator which concerns on the 2nd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 1st modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 2nd modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 3rd modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 4th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 5th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 6th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 7th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 8th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 9th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 10th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 11th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 12th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 13th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 14th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 15th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 16th modification of the 3rd Embodiment of this invention. It is a figure which shows typically the structure of the pulse tube refrigerator which concerns on the 17th modification of the 3rd Embodiment of this invention.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
(First embodiment)
A pulse tube refrigerator according to a first embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a diagram schematically showing a configuration of a pulse tube refrigerator according to the present embodiment.

  As shown in FIG. 1, the pulse tube refrigerator 100 according to the present embodiment includes a compressor 10, a valve unit 20, an expander 40, and a first buffer 60. The pulse tube refrigerator 10 is a one-stage pulse tube refrigerator.

  The compressor 10 has a high-pressure pipe 11 on the discharge side and a low-pressure pipe 12 on the suction side. The compressor 10 collects the refrigerant gas from the expander 40 through the low-pressure pipe 12, sucks the collected refrigerant gas from the low-pressure pipe 12, compresses the drawn refrigerant gas, and discharges the compressed refrigerant gas to the high-pressure pipe 11. The refrigerant gas is supplied to the expander 40 through the high-pressure pipe 11.

  The valve unit 20 includes a first discharge side valve 21, a first suction side valve 22, and a first filter 23. The valve unit 20 is connected between the compressor 10 and the expander 40, and alternately communicates the high pressure pipe 11 on the discharge side of the compressor 10 and the low pressure pipe 12 on the suction side of the compressor 10 to the expander 40 alternately. Let The first discharge-side valve 21 communicates or blocks the high-pressure pipe 11 on the discharge side of the compressor 10 and the expander 40. The first suction side valve 22 communicates or blocks the low pressure pipe 12 on the suction side of the compressor 10 and the expander 40.

  The expander 40 includes a first regenerative tube 41, a first pulse tube 42, a cryogenic vessel 43, a flange / pipe unit 44, a first orifice 51, and a second orifice 52.

  The first regenerator tube 41 stores the cold generated by the adiabatic expansion of the helium gas that is the refrigerant gas. The first cold storage tube 41 has a high temperature end connected to the flange / pipe unit 44 and a low temperature end connected to the low temperature end of the first pulse tube 42. In the first pulse tube 42, helium gas, which is a refrigerant gas supplied through the first cold storage tube 41, repeats adiabatic expansion to generate cold. The first pulse tube 42 has a high temperature end connected to the flange / pipe unit 44 and a low temperature end connected to the low temperature end of the first regenerator tube 41.

  The first pulse tube 42 has rectifiers 45 and 46 at the high temperature end and the low temperature end, respectively. The rectifiers 45 and 46 are for stabilizing the flow of the refrigerant gas in the first pulse tube 42.

  The cryogenic vessel 43 accommodates a first regenerator tube 41 and a first pulse tube 42 connected to the flange / pipe unit 44.

  The flange / pipe unit 44 has a first orifice 51 and a second orifice 52. The flange / pipe unit 44 has a function as a flange for sealing the low-temperature vessel 43 in a state where the first regenerator tube 41 and the first pulse tube 42 are accommodated in the low-temperature vessel 43, and the first regenerator tube 41, and also has a function as a piping unit for connecting the first pulse tube 42 and the valve unit 20.

  The first buffer 60 is connected to the flange / pipe unit 44. The first buffer 60 accommodates the refrigerant gas flowing out from the first pulse tube 42 and functions as a phase control mechanism that controls the phase difference between the pressure fluctuation and the flow velocity fluctuation of the refrigerant gas in the first pulse tube 42. Have.

  Next, the arrangement of refrigerant gas piping and the self-sealing joint arrangement in the valve unit 20 and the flange / piping unit 44 will be described.

  In the valve unit 20, a first filter 23 is provided between the discharge side of the first discharge side valve 21 and the high temperature end side of the first cold storage pipe 42. Further, the first suction side valve 22 is coupled to the first filter 23 via a first coupling point P1 that is an intermediate point between the discharge side of the first discharge side valve 21 and the first filter 23. Is provided. Therefore, the first filter 23 is also provided between the high temperature end side of the first regenerative tube 41 and the suction side of the first suction side valve 22. With such a pipe structure, the refrigerant gas flows from the high pressure pipe 11 to the high temperature end side of the first regenerator pipe 41 in a state where the first discharge side valve 21 is opened and the first suction side valve 22 is closed. In the discharged state, a filter can be provided between the first discharge side valve 21 and the high temperature end side of the first regenerator tube 41. In a state where the first discharge side valve 21 is closed and the first suction side valve 22 is opened, that is, in a state where the refrigerant gas is sucked into the low pressure pipe 12 from the high temperature end side of the first cold storage pipe 41, A filter can be provided between the high temperature end side of the first regenerative tube 41 and the first suction side valve 22. Accordingly, as shown in FIG. 1, the valve unit 20 is connected to the compressor 10 at two locations, that is, the suction side of the first discharge side valve 21 and the discharge side of the first suction side valve 22. The filter 23 is connected to the expander 40 at one location on the first cold storage tube 41 side.

  In the flange / pipe unit 44, the first orifice 51 includes a coupling point P 2 that is an intermediate point between the first filter 23 and the high temperature end side of the first regenerative tube 41, and a high temperature end of the first pulse tube 42. Between the side. In the flange / pipe unit 44, the second orifice 52 is located between the fourth coupling point P 3, which is an intermediate point between the first orifice 51 and the second pulse tube 42, and the first buffer 60. Is provided. Therefore, a part of the refrigerant gas flowing in and out from the first filter 23 to the high temperature end side of the first regenerative tube 41 is limited in flow rate by the first orifice 51, and the high temperature end side of the first pulse tube 42. Flows in and out. Further, a part of the refrigerant gas flowing in and out from the first filter 23 to the high temperature end side of the first pulse tube 42 is restricted in flow rate by the second orifice 52 and flows into and out of the first buffer 60.

  The pulse tube refrigerator 100 includes a first self-sealing joint 31, a second self-sealing joint 32, and a third self-sealing joint 33 in the middle of the pipe having such an arrangement. The first self-sealing joint 31 is provided between the discharge side of the compressor 10 and the suction side of the first discharge side valve 21. In the present embodiment, the first self-sealing joint 31 is provided at a position where the high-pressure pipe 11 that is the discharge side of the compressor 10 and the valve unit 20 that houses the first discharge-side valve 21 are connected. It is done.

  The second self-sealing joint 32 is provided between the discharge side of the first suction side valve 22 and the suction side of the compressor 10. In the present embodiment, the second self-sealing joint 32 is provided at a position where the valve unit 20 in which the first suction side valve 22 is accommodated and the low pressure pipe 12 on the suction side of the compressor 10 is connected. It is done.

  The third self-sealing joint 33 is provided between the first cool storage tube 41 side of the first filter 23 and the high temperature end side of the first cool storage tube 41. In the present embodiment, the third self-sealing joint 33 is provided between the valve unit 20 in which the first filter 23 is accommodated and the flange / pipe unit 44.

  Self-sealing joint means a joint for pipes consisting of two members, a male half and a female half, each of which can be shielded at the tip of the pipe and connected to each other when connected to each other. To do. When the self-sealing joint is used, the tip of each pipe can be automatically shielded again by releasing the connection of the two members even after the two pipes are once communicated. That is, when the self-sealing joint is used, the two pipes can be attached and detached freely without causing the refrigerant gas, which is the fluid in the pipe, to flow out.

  Specifically, as a pipe, for example, a male half and a female half are fixed directly or via a short connecting pipe to the tip of a Cu tube, a SUS tube, or a resin tube having an outer diameter of 6.35 mm and an inner diameter of 4.35 mm. Things can be used.

  The first filter 23 is not particularly limited. For example, a column filter using a material such as sintered metal or resin, a mesh filter using a material such as resin or metal, or a felt may be used. it can. The column filter mesh diameter and the mesh filter mesh diameter may be, for example, 1 to 50 μm.

  Next, there will be described an operation of performing cooling and cooling of the pulse tube refrigerator, an operation of removing the abrasion powder by the filter, and an operation of performing the maintenance work of the filter without increasing the temperature of the refrigerator.

  First, the effect | action which performs the freezing cooling of a pulse tube refrigerator is demonstrated.

  In the pulse tube refrigerator 100 having the above-described configuration, the operation for connecting the first discharge side valve 21 and the first suction side valve 22 accommodated in the valve unit 20 and the operation for blocking the operation are opposite to each other. Repeat. Then, the high temperature end side of the first cold storage pipe 41 is switched and communicated with the high pressure pipe 11 or the low pressure pipe 12. As a result, since the refrigerant gas is periodically supplied / recovered to the first pulse tube 42 communicated with the low temperature end side of the first regenerator tube 41, the refrigerant gas is compressed in the first pulse tube 42. The low temperature end side of the first cold storage tube 41 is cooled by repeating the expansion and storing cold heat generated by adiabatic expansion in the first cold storage tube 41 at that time.

  Further, in the pulse tube refrigerator 100 in the present embodiment, the first regenerator tube 41 is switched to the high pressure pipe 11 and communicated with the refrigerant gas to the high temperature end side of the first pulse tube 42 through the first orifice 51. The refrigerant gas is allowed to flow in, and the refrigerant gas is prevented from flowing in from the low temperature end side of the first pulse tube 42. Thereafter, when the pressure in the first pulse tube 42 becomes higher than the pressure in the first buffer 60, the refrigerant gas in the first pulse tube 42 passes through the second orifice 52 and enters the first buffer 60. The refrigerant gas in the first pulse tube 42 moves to the high temperature end side of the first pulse tube 42.

  Next, the first regenerative tube 41 is switched to and communicated with the low-pressure pipe 12, and the refrigerant gas is allowed to flow out from the high temperature end side of the first pulse tube 42 through the first orifice 51. Controls the outflow of refrigerant gas from the end side. Thereafter, when the pressure in the first pulse tube 42 becomes lower than the pressure in the first buffer 60, the refrigerant gas in the first buffer 60 passes through the second orifice 52 and enters the first pulse tube 42. It flows out, and the refrigerant gas in the first pulse tube 42 moves to the low temperature end side of the first pulse tube 42.

  As a result, the timing of the pressure change in the first pulse tube 42 and the flow velocity change are shifted and the phase difference increases, so that the amount of work in which the refrigerator generates cold when the compression / expansion of the refrigerant gas is repeated is large. Thus, the refrigerating capacity is improved. In the pulse tube refrigerator 100 according to the present embodiment, for example, helium (He) gas having a pressure of, for example, 0.5 to 2.5 MPa is used as the refrigerant gas. For example, the refrigerant gas is heated at a repetition rate of about 2 Hz. By repeating the compression / expansion, a low temperature of, for example, about 50 K can be obtained on the low temperature end side of the first pulse tube 42.

  Next, the effect | action which a filter removes abrasion powder is demonstrated.

  As described above, the first discharge side valve 21 and the first suction side valve 22 repeat the communication state and the cutoff state at a speed of about 2 Hz. A known rotary valve can be used for the first discharge side valve 21 and the first suction side valve 22. The rotary valve includes a rotatable disk having communication holes for periodically switching between a communication state and a blocking state, and a fixed seal material for receiving the disk while sliding. The seal material is worn by sliding between the disc and the seal material, and wear powder is generated. The material of the disk is not particularly limited. For example, an aluminum material whose sliding surface is anodized can be used. The material of the sealing material is not particularly limited, and for example, a fluororesin material or a ceramic material can be used. When the disk is made of an anodized aluminum material and the seal material is a fluororesin material, the Young's modulus of the anodized aluminum material is larger than the Young's modulus of aluminum of 70 GPa, although it depends on the anodizing method. Since the Young's modulus of the resin material is about 0.5 to 1.0 GPa, the fluororesin material of the sealing material is unilaterally worn, and wear powder of fluororesin powder is generated. The size of the wear powder is not particularly limited because it depends on the weight and rotation speed of the disk, but is, for example, 1 to 50 μm.

  The abrasion powder generated in the first discharge side valve 21 moves along the flow direction of the refrigerant gas, and moves from the discharge side of the first discharge side valve 21 to the high temperature end side of the first cold storage pipe 41. To do. The inside of the first regenerator tube 41 is filled with, for example, a copper net or a lead ball as a regenerator, and when wear powder accumulates in the gaps between the regenerators, the contact area between the refrigerant gas and the regenerator is reduced. In addition, the ability of the first regenerator 41 to store the cold is reduced, and the refrigerating capacity of the pulse tube refrigerator 100 is reduced.

  However, when the first filter 23 is provided between the discharge side of the first discharge side valve 21 and the high temperature end side of the first regenerative tube 41, the wear powder is removed by the first filter 23. The wear powder does not enter the first regenerative tube 41.

  The wear powder generated in the first suction side valve 22 hardly moves to the first regenerator 41 side because the refrigerant gas flows in the reverse direction, but partially moves in the reverse direction. Even if there is, wear powder is removed by the first filter 23. Further, in the first filter 23, since the refrigerant gas flows in both directions, there is little possibility that the abrasion powder clogs the filter.

  Next, the effect | action which can perform the maintenance work of a filter, without heating up a refrigerator is demonstrated.

  First, the operation of the pulse tube refrigerator 100 is stopped. Next, the coupling of the first self-sealing joint 31 provided between the discharge side of the compressor 10 and the suction side of the first discharge side valve 21 is released. Further, the coupling of the second self-sealing joint 32 provided between the discharge side of the first suction side valve 22 and the suction side of the compressor 10 is released. Further, the coupling of the third self-seal joint 33 provided between the first cool storage tube 41 side of the first filter 23 and the high temperature end side of the first cool storage tube 41 is released. As a result, it is possible to separate only the valve unit 20 from the compressor 10 and the expander 40 in a state where the refrigerant gas is held without allowing air and impurities to enter the compressor 10 and the expander 40.

  Next, the valve unit 20 is disassembled, and the first filter 23 is taken out. Next, a new first filter 23 is attached and the valve unit 20 is assembled. Thereafter, the inside of the valve unit 20 is replaced with the refrigerant gas from the atmosphere, and the first self-sealing joint 31, the second self-sealing joint 32, and the third self-sealing joint 33 are coupled. As a result, the valve unit 20 is connected to the compressor 10 and the expander 40. Also at this time, the valve unit 20 can be connected in a state in which the refrigerant gas is held without allowing air and impurities to enter the compressor 10 and the expander 40.

  Here, when the valve unit 20 is separated from the expander 40 without using the third self-sealing joint 33, if the atmosphere enters the expander 40 in a state where the expander 40 is cooled, water vapor, nitrogen in the atmosphere Gas or oxygen gas or the like condenses or solidifies in the pipe connecting the low temperature end side of the first regenerative tube 41 and the low temperature end side of the first pulse tube 42, and the first regenerative tube 41 and the first The pulse tube 42 is not in communication and the expander 40 becomes inoperable. Therefore, when the valve unit 20 is separated from the expander 40 without using the third self-sealing joint 33, the separation operation cannot be performed immediately after the operation of the pulse tube refrigerator 100 is stopped. You have to wait until the temperature of 40 rises to room temperature. The time for the temperature of the expander 40 to rise to room temperature is 20 hours, for example, although it depends on the configuration of the entire system using the pulse tube refrigerator 100.

  On the other hand, when the valve unit 20 is separated from the expander 40 using the third self-sealing joint 33, it is not necessary to raise the temperature of the expander 40 to room temperature. This can be done in two hours, and the time required for maintenance work can be shortened.

  Further, when the valve unit 20 and the compressor 10 are connected without using the first self-sealing joint 31 and the second self-sealing joint 32, if the atmosphere enters the compressor 10, impurities in the atmosphere are compressed into the compressor. 10 and causes a failure of the compressor 10. Furthermore, when connecting using a normal valve and a normal joint instead of the first self-sealing joint 31 and the second self-sealing joint 32, there is no fear that the atmosphere will enter the compressor 10, but the first As compared with the case where the self-sealing joint 31 and the second self-sealing joint 32 are used, the opening / closing operation of the valve and the operation of releasing the connection of the joint are necessary. You have to do complicated work.

  On the other hand, when the valve unit 20 is separated from the compressor 10 using the first self-sealing joint 31 and the second self-sealing joint 32, the maintenance work of the first filter 23 without introducing impurities into the compressor 10 is performed. Can be easily performed.

  As described above, according to the pulse tube refrigerator according to the present embodiment, the filter for removing the abrasion powder generated in the valve is connected between the compressor and the expander using the self-sealing joint. The maintenance work of the filter can be performed without performing the temperature raising operation for raising the temperature of the machine to room temperature or the gas replacement operation for replacing the gas.

In the present embodiment, the first filter 23 is configured to be disposed outside the valve unit 20 if it is disposed closer to the compressor 10 than the third self-sealing joint 33. Also good.
(First modification of the first embodiment)
Next, a pulse tube refrigerator according to a first modification of the first embodiment of the present invention will be described with reference to FIG.

  FIG. 2 is a diagram schematically showing the configuration of the pulse tube refrigerator according to this modification. However, in the following text, the same reference numerals are given to the parts described above, and the description may be omitted (the same applies to the following modified examples and embodiments).

  The pulse tube refrigerator according to the present modification has the pulse tube according to the first embodiment in that the first orifice is connected to the valve unit so as to be separable from the expander using a self-sealing joint. It differs from the refrigerator.

  Referring to FIG. 2, in the first embodiment, the first orifice is provided in the flange / pipe unit of the expander and cannot be separated from the expander. In the pulse tube refrigerator 100a, the first orifice 51a is provided in the valve unit 20a, and is connected to the expander 40a in a separable manner using the self-sealing joint 34.

  As shown in FIG. 2, the pulse tube refrigerator 100a according to the present modification has the same configuration as the first embodiment except for the valve unit 20a, the self-sealing joint 34, and the flange / pipe unit 44a.

  Unlike the first embodiment, the valve unit 20a has a first orifice 51a. The first orifice 51 a is provided between a coupling point P 2, which is an intermediate point between the first filter 23 and the third self-sealing joint 33, and the high temperature end side of the first pulse tube 42. Since the first orifice 51a is provided in the valve unit 20a, the coupling point P2 is also provided in the valve unit 20a. The function of the first orifice 51a is the same as that of the first embodiment, and restricts the flow rate of the refrigerant gas flowing in and out from the first filter 23 to the high temperature end side of the first pulse tube 42.

  The self seal joint 34 is provided between the first pulse tube 42 side of the first orifice 51 a and the high temperature end side of the first pulse tube 42. In this modification, the self-sealing joint 34 is provided between the valve unit 20a in which the first orifice 51a is accommodated and the flange / pipe unit 44a.

  The flange / pipe unit 44a has the second orifice 52 as in the first embodiment, but does not include the first orifice 51a unlike the first embodiment. In the flange / pipe unit 44 a, the second orifice 52 is formed between the fourth coupling point P 3, which is an intermediate point between the self-sealing joint 34 and the high temperature end side of the first pulse tube 42, and the first buffer 60. What is provided between them is the same as that of the first embodiment.

  In this modification, the effect | action which performs the freezing cooling of the pulse tube refrigerator 100a, and the effect | action that a filter removes abrasion powder are the same as 1st Embodiment. However, in the present modification, the function of performing the maintenance work of the filter without raising the temperature of the refrigerator is different from that of the first embodiment in the following points.

  The first orifice 51a is for limiting the flow rate of the refrigerant gas flowing in and out from the first filter 23 to the high temperature end side of the first pulse tube 42, and is, for example, a thin orifice having a diameter of 0.01 to 2 mm. A tube can be used. Although most of the abrasion powder generated in the first discharge valve 21 is removed when passing through the first filter 23, some of the abrasion powder smaller than the diameter of the first filter 23 is not removed. If it passes, it may accumulate in the vicinity of the first orifice 51a. Therefore, in addition to the first filter 23, the first orifice 51a also requires periodic maintenance work, for example, once every 10,000 hours.

  The maintenance work of the pulse tube refrigerator 100a stops the operation of the pulse tube refrigerator 100a and releases the coupling of the first self-sealing joint 31, the second self-sealing joint 32, and the third self-sealing joint 33. In addition, the coupling of the self-sealing joint 34 is released, and the valve unit 20a is separated from the compressor 10 and the expander 40a. At this time, as in the first embodiment, only the valve unit 20a can be separated without allowing air and impurities to enter the compressor 10 and the expander 40a.

  Next, the valve unit 20a is disassembled, the first filter 23 and the first orifice 51a are taken out, and a new first filter 23 and a new or first orifice 51a that has been separately cleaned are mounted. 20a is assembled, the inside of the valve unit 20a is replaced with a refrigerant gas, and the first self-sealing joint 31, the second self-sealing joint 32, the third self-sealing joint 33, and the self-sealing joint 34 are coupled, and the valve unit 20a Are connected to the compressor 10 and the expander 40a. Also at this time, similarly to the first embodiment, the valve unit 20a can be connected without allowing air and impurities to enter the compressor 10 and the expander 40a.

  In addition, by using the third self-sealing joint 33 and the self-sealing joint 34, the maintenance work of the first filter 23 and the first orifice 51a is not required without increasing the temperature of the expander 40a to room temperature. It can be performed. Further, by using the first self-sealing joint 31 and the second self-sealing joint 32, maintenance work of the first filter 23 and the first orifice 51a can be performed without introducing impurities into the compressor 10. it can.

  As described above, according to the pulse tube refrigerator according to the present modification, the filter for removing the wear powder and the orifice on which the wear powder easily accumulates are connected between the compressor and the expander using the self-sealing joint. The maintenance work of the filter and the orifice can be performed without performing the temperature raising operation for raising the temperature of the pulse tube refrigerator to room temperature and the gas replacement operation for replacing the gas.

In the present modification, the first orifice 51a may be configured to be disposed outside the valve unit 20a as long as it is disposed closer to the compressor 10 than the self-sealing joint 34.
(Second modification of the first embodiment)
Next, a pulse tube refrigerator according to a second modification of the first embodiment of the present invention will be described with reference to FIG.

  FIG. 3 is a diagram schematically showing the configuration of the pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the first embodiment in that the second orifice is connected to the valve unit so as to be separable from the expander and the first buffer using a self-sealing joint. This is different from the pulse tube refrigerator according to the first modification of the embodiment.

  Referring to FIG. 3, in the first modification of the first embodiment, the second orifice is provided in the flange / pipe unit of the expander and cannot be separated from the expander. In the pulse tube refrigerator 100b according to the present modification, the second orifice 52a is provided in the valve unit 20b and is separably connected to the first buffer 60 using the fourth self-sealing joint 35. The

  As shown in FIG. 3, the pulse tube refrigerator 100b according to the present modification has the same configuration as that of the first embodiment except for the valve unit 20b, the fourth self-seal joint 35, and the flange / pipe unit 44b. This is the same as the first modification.

  Unlike the first modification of the first embodiment, the valve unit 20b has a second orifice 52a. The second orifice 52 a is provided between the first buffer 60 and the fourth coupling point P 3, which is an intermediate point between the first orifice 51 a and the self-sealing joint 34. Since the second orifice 52a is provided in the valve unit 20b, the fourth coupling point P3 is also provided in the valve unit 20b. The function of the second orifice 52a is the same as that of the first modification of the first embodiment, and a part of the refrigerant gas flowing in and out from the first filter 23 to the high temperature end side of the first pulse tube 42. Thus, the flow rate of the refrigerant gas flowing into and out of the first buffer 60 is limited.

  The fourth self-sealing joint 35 is provided between the first buffer 60 side of the second orifice 52 a and the first buffer 60. In the present modification, the fourth self-seal joint 35 is provided between the valve unit 20 b that houses the second orifice 52 a and the first buffer 60.

  Unlike the first embodiment, the flange / pipe unit 44b does not include the second orifice.

  In this modification, the effect | action which performs the freezing cooling of the pulse tube refrigerator 100b, and the effect | action that a filter removes abrasion powder are the same as the 1st modification of 1st Embodiment. However, in the present modification, the function of performing the maintenance work of the filter without raising the temperature of the refrigerator is different from the first modification of the first embodiment in the following points.

  The second orifice 52a limits the flow rate of the refrigerant gas that flows into the first buffer 60 and is part of the refrigerant gas that flows into and out of the first pulse tube 42 from the first filter 23 toward the high temperature end side. For example, a thin orifice tube having a diameter of 0.01 to 2 mm can be used. A part of the abrasion powder generated in the first discharge valve 21 is removed when passing through the first filter 23, and a part of the wear powder is deposited when passing through the first orifice 51a. It may be deposited near the second orifice 52a. Therefore, in addition to the first filter 23 and the first orifice 51a, the second orifice 52a also requires periodic maintenance work, for example, once every 10,000 hours.

  The maintenance work of the pulse tube refrigerator 100b stops the operation of the pulse tube refrigerator 100b, and the first self seal joint 31, the second self seal joint 32, the third self seal joint 33, and the self seal joint 34 are stopped. In addition to releasing the connection, the connection of the fourth self-sealing joint 35 is released, and the valve unit 20b is separated from the compressor 10 and the expander 40b. At this time, as in the first embodiment, only the valve unit 20b can be separated without allowing air and impurities to enter the compressor 10 and the expander 40b.

  Next, the valve unit 20b is disassembled, the first filter 23, the first orifice 51a, and the second orifice 52a are taken out, and the new first filter 23 and the new or first orifice 51a that has been separately cleaned. The second orifice 52a is mounted, the valve unit 20b is assembled, the inside of the valve unit 20b is replaced with the refrigerant gas, the first self-sealing joint 31, the second self-sealing joint 32, and the third self-sealing joint 33. Then, the self-sealing joint 34 and the fourth self-sealing joint 35 are coupled, and the valve unit 20b is connected to the compressor 10 and the expander 40b. Also at this time, similarly to the first embodiment, the valve unit 20b can be connected without allowing air and impurities to enter the compressor 10 and the expander 40b.

  Further, by using the third self-seal joint 33, the self-seal joint 34, and the fourth self-seal joint 35, the first filter 23, without requiring time to raise the temperature of the expander 40b to room temperature, Maintenance work of the first orifice 51a and the second orifice 52a can be performed. Further, by using the first self-sealing joint 31 and the second self-sealing joint 32, maintenance work of the first filter 23 and the first orifice 51a can be performed without introducing impurities into the compressor 10. it can.

  As described above, according to the pulse tube refrigerator according to the present modification, the filter for removing the wear powder and the orifice on which the wear powder easily accumulates are connected between the compressor and the expander using the self-sealing joint. The maintenance work of the filter and the orifice can be performed without performing the temperature raising operation for raising the temperature of the pulse tube refrigerator to room temperature and the gas replacement operation for replacing the gas.

In the present modification, the second orifice 52a may be arranged outside the valve unit 20b as long as it is arranged closer to the compressor 10 than the fourth self-sealing joint 35. Good.
(Third modification of the first embodiment)
Next, with reference to FIG. 4, the pulse tube refrigerator which concerns on the 3rd modification of the 1st Embodiment of this invention is demonstrated.

  FIG. 4 is a diagram schematically showing the configuration of the pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is a four-valve type one-stage pulse tube refrigerator, which is different from the pulse tube refrigerator according to the first embodiment.

  Referring to FIG. 4, in the first embodiment, the high temperature end side of the first pulse tube is connected to the first discharge side valve and the first suction through the first orifice and the first filter. Unlike the connection to the side valve, the pulse tube refrigerator 100c according to the present modification has a second discharge side valve 21a in which the high temperature end side of the first pulse tube 42 is different from the first discharge side valve 21. , And a second suction side valve 22 a different from the first suction side valve 22, and is connected to the discharge side and the suction side of the compressor 10.

  As shown in FIG. 4, the pulse tube refrigerator 100c according to this modification is the same as that of the first embodiment except for the valve unit 20c, the fifth self-seal joint 36, and the flange / pipe unit 44c. It is.

  Unlike the first embodiment, the valve unit 20c includes a second discharge side valve 21a, a second suction side valve 22a, a second filter 23a, and first orifices 51b and 51c.

  The second discharge side valve 21a is connected to the discharge side of the compressor 10 via a second coupling point P4 that is an intermediate point between the suction side of the first discharge side valve 21 and the first self-sealing joint 31. It connects, and the discharge side of the compressor 10 and the high temperature end side of the 1st pulse tube 42 are connected or interrupted | blocked. The second suction side valve 22a is coupled to the suction side of the compressor 10 via a third coupling point P5 which is an intermediate point between the discharge side of the first suction side valve 22 and the second self-sealing joint 32. Then, the high temperature end side of the first pulse tube 42 and the suction side of the compressor 10 are communicated or blocked. The second filter 23 a is provided between the discharge side of the second discharge side valve 21 a and the high temperature end side of the first pulse tube 42.

  Further, in the present modification, the second suction side valve 22a is connected to the second suction point P8 via an eighth coupling point P8 that is an intermediate point between the discharge side of the second discharge side valve 21a and the second filter 23a. It is provided so as to be coupled with the filter 23a. Accordingly, the second filter 23a is also provided between the high temperature end side of the first pulse tube 42 and the suction side of the second suction side valve 22a. With such a pipe structure, the second discharge side valve 21a is opened and the second suction side valve 22a is closed, that is, the refrigerant gas flows from the high pressure pipe 11 to the high temperature end side of the first pulse tube 42. In the discharged state, a filter can be provided between the second discharge side valve 21 a and the high temperature end side of the first pulse tube 42. In the state where the second discharge side valve 21a is closed and the second suction side valve 22a is opened, that is, in the state where the refrigerant gas is sucked into the low pressure pipe 12 from the high temperature end side of the first pulse tube 42, A filter can be provided between the high temperature end side of the first pulse tube 42 and the second suction side valve 22a.

  The first orifice 51b is provided between the discharge side of the second discharge side valve 21a and the eighth connection point P8, and the first orifice 51c is connected to the eighth connection point P8 and the second connection point P8. It is provided between the suction side of the suction side valve 22a. Therefore, the flow rate of the refrigerant gas flowing from the second discharge side valve 21a to the high temperature end side of the first pulse tube 42 is limited by the first orifice 51b, and the refrigerant gas flows from the high temperature end side of the first pulse tube 42 to the The flow rate of the refrigerant gas flowing out to the second suction side valve 22a is limited by the first orifice 51c.

  The fifth self-sealing joint 36 is provided between the first pulse tube 42 side of the second filter 23 a and the high temperature end side of the first pulse tube 42. In this modification, the fifth self-seal joint 36 is provided between the valve unit 20c in which the second filter 23a is accommodated and the flange / pipe unit 44c.

  The flange / pipe unit 44c has the second orifice 52 as in the first embodiment, but does not include the first orifice unlike the first embodiment. This is the same as the first modification of the first embodiment.

  In the present modification, the effect of performing the cooling and cooling of the pulse tube refrigerator 100c, the effect of removing the abrasion powder by the filter, and the effect of performing the maintenance work of the filter without increasing the temperature of the refrigerator are as follows. This is different from the first embodiment.

  First, the effect | action which performs the freezing cooling of a pulse tube refrigerator is demonstrated focusing on a different point from 1st Embodiment.

  In the pulse tube refrigerator 100c having the above-described configuration, the refrigerant gas repeatedly compresses and expands in the first pulse tube 42 as the refrigerant gas is supplied / recovered from the high temperature end side of the first regenerator tube 41. The cold heat generated by the adiabatic expansion is stored in the first regenerator tube 41, and the low temperature end side of the first regenerator tube 41 is cooled, as in the first embodiment.

  In addition, the first orifices 51 b and 51 c, the second orifice 52, and the first buffer 60 are used to cause the refrigerant gas to flow in and out from the high temperature end side of the first pulse tube 42. As in the first embodiment, the phase difference between the pressure change and the flow velocity change is increased to improve the refrigerating capacity.

  However, in the pulse tube refrigerator 100c in the present embodiment, the high temperature end of the first pulse tube 42 allows the second discharge side valve 21a and the second suction side valve 22a accommodated in the valve unit 20 to communicate with each other. By repeating the operation and the blocking operation so as to be opposite to each other, the high-pressure pipe 11 or the low-pressure pipe 12 is switched and communicated. Since the timing for switching the second discharge side valve 21a and the second suction side valve 22a can be shifted from the timing for switching the first discharge side valve 21 and the first suction side valve 22, the first Compared to the embodiment, the phase difference between the pressure change and the flow rate change in the first pulse tube 42 can be further increased, and the refrigerating capacity of the pulse tube refrigerator 100c can be improved. The timing for switching the second discharge side valve 21a and the second suction side valve 22a can be shifted by, for example, 1 to 60 ° from the timing for switching the first discharge side valve 21 and the first suction side valve 22. Further, as the refrigerant gas, for example, helium (He) gas having a pressure of 0.5 to 2.5 MPa is used. For example, the refrigerant gas can be repeatedly compressed and expanded at a repetition rate of about 2 Hz. Although it is the same as the first embodiment, a low temperature of, for example, about 40 K, which is a lower temperature than the first embodiment, can be obtained on the low temperature end side of the first pulse tube 42.

  Next, the effect | action which a filter removes abrasion powder is demonstrated.

  The operation of the first filter 23 to remove the wear powder generated in the first discharge side valve 21 and the first suction side valve 22 is the same as that in the first embodiment.

  On the other hand, since the second discharge side valve 21a and the second suction side valve 22a also use rotary valves like the first discharge side valve 21 and the first suction side valve 22, wear powder is generated. The abrasion powder generated in the second discharge side valve 21a moves along the flow direction of the refrigerant gas, and from the discharge side of the second discharge side valve 21a to the high temperature end side of the first pulse tube 42, the first The low-temperature end side of the pulse tube 42 and the low-temperature end side of the first cold storage tube 41 move into the first cold storage tube 41. At this time, the wear powder accumulates on the rectifiers 45 and 46 and increases the possibility of clogging the flow path. Moreover, there is a possibility that the wear powder accumulates in the gap of the regenerator material in the first regenerator tube 41, and the refrigerating capacity of the pulse tube refrigerator 100c is reduced as in the first embodiment.

  However, when the second filter 23a is provided between the discharge side of the second discharge side valve 21a and the high temperature end side of the first pulse tube 42, the wear powder is removed by the second filter 23a. The wear powder does not enter the first pulse tube 42.

  Note that the wear powder generated in the second suction side valve 22a hardly moves to the first pulse tube 42 side because the refrigerant gas flows in the reverse direction, but partially moves in the reverse direction. Even if there is, wear powder is removed by the second filter 23a. Further, in the second filter 23a, since the refrigerant gas flows in both directions, there is little possibility that the wear powder clogs the filter.

  Next, the effect | action which can perform the maintenance work of a filter, without heating up a refrigerator is demonstrated.

  The maintenance work of the pulse tube refrigerator 100c is to stop the operation of the pulse tube refrigerator 100c and release the coupling of the first self-sealing joint 31, the second self-sealing joint 32, and the third self-sealing joint 33. In addition, the coupling of the fifth self-sealing joint 36 is released, and the valve unit 20c is separated from the compressor 10 and the expander 40c. At this time, as in the first embodiment, only the valve unit 20c can be separated without allowing air and impurities to enter the compressor 10 and the expander 40c.

  Next, the valve unit 20c is disassembled, the first filter 23, the second filter 23a, and the first orifices 51b and 51c are taken out, and the new first filter 23, the new second filter 23a, and The first orifices 51b and 51c which are new or have been separately cleaned are mounted, the valve unit 20c is assembled, the inside of the valve unit 20c is replaced with a refrigerant gas, the first self-sealing joint 31 and the second self-sealing joint 32. The third self-seal joint 33 and the fifth self-seal joint 36 are coupled, and the valve unit 20c is connected to the compressor 10 and the expander 40c. Also at this time, similarly to the first embodiment, the valve unit 20c can be connected without allowing air and impurities to enter the compressor 10 and the expander 40c.

  Further, by using the third self-sealing joint 33 and the fifth self-sealing joint 36, the first filter 23 and the second filter 23a are not required to increase the temperature of the expander 40c to room temperature. And maintenance work of the first orifices 51b and 51c can be performed. Further, by using the first self-sealing joint 31 and the second self-sealing joint 32, the first filter 23, the second filter 23a, and the first orifice 51b can be obtained without introducing impurities into the compressor 10. , 51c can be performed.

  As described above, according to the pulse tube refrigerator according to the present modification, the filter for removing the wear powder and the orifice on which the wear powder easily accumulates are connected between the compressor and the expander using the self-sealing joint. The maintenance work of the filter and the orifice can be performed without performing the temperature raising operation for raising the temperature of the pulse tube refrigerator to room temperature and the gas replacement operation for replacing the gas.

In the present modification, if the second filter 23a and the first orifices 51b and 51c are arranged closer to the compressor 10 than the fifth self-sealing joint 36, they are arranged outside the valve unit 20c. It may be configured to be.
(Fourth modification of the first embodiment)
Next, with reference to FIG. 5, the pulse tube refrigerator which concerns on the 4th modification of the 1st Embodiment of this invention is demonstrated.

  FIG. 5 is a diagram schematically showing the configuration of the pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification differs from the pulse tube refrigerator according to the third modification of the first embodiment in that the second filter is connected only to the second discharge side valve. To do.

  Referring to FIG. 5, in the third modification of the first embodiment, the second filter is different from being switched and communicated with the second discharge side valve and the second suction side valve. In the pulse tube refrigerator 100d according to this modification, the second filter 23a is not connected to the second suction side valve 22a, but is connected only to the second discharge side valve 21a.

  As shown in FIG. 5, the pulse tube refrigerator 100d according to the present modification has the same configuration as the first embodiment except for the valve unit 20d, the fifth self-seal joints 36 and 36a, and the flange / pipe unit 44d. This is the same as the third modification.

  Unlike the third modification of the first embodiment, the valve unit 20d does not include the first orifices 51b and 51c. Instead, the flange / pipe unit 44d has first orifices 51b and 51c. In the present modification, the eighth coupling point P8, the first orifice 51b, and the first orifice 51c are arranged in the flange / pipe unit 44d.

  The fifth self-sealing joint 36 has two places, that is, fifth self-sealing joints 36 and 36a, which is one place in the third modification of the first embodiment. In the present modification, the fifth self-seal joint 36 is provided between the discharge side of the second filter 23a and the suction side of the first orifice 51b. The fifth self-seal joint 36a is provided between the discharge side of the second orifice 51c and the suction side of the second suction side valve 22a.

  In the present modification, the action of performing the refrigeration cooling of the pulse tube refrigerator 100d, the action of removing the abrasion powder by the filter, and the action of performing the maintenance work of the filter without raising the temperature of the refrigerator are as follows. This is the same as the third modification of the embodiment.

  However, in the present modification, the second filter 23a is provided between the discharge side of the second discharge side valve 21a and the compressor 10 side of the first orifice 51b. Therefore, it is possible to reduce the possibility that the abrasion powder generated in the second discharge side valve 21a accumulates on the first orifice 51b and the rectifiers 45 and 46 and clogs the flow path. Further, in the third modification of the first embodiment, the direction of the refrigerant gas flowing through the second filter 23a is different from that periodically reversed, and in the present modification, the refrigerant gas flows through the second filter 23a. Since the direction of the refrigerant gas is constant, there is a high possibility that the wear powder accumulates on the first orifice 51b and clogs the piping. Therefore, the effect of removing the wear powder by providing the second filter 23a is greater than that of the third modification of the first embodiment.

  As described above, according to the pulse tube refrigerator according to the present modification, the filter for removing the wear powder and the orifice on which the wear powder easily accumulates are connected between the compressor and the expander using the self-sealing joint. The maintenance work of the filter and the orifice can be performed without performing the temperature raising operation for raising the temperature of the pulse tube refrigerator to room temperature and the gas replacement operation for replacing the gas.

In the present modification, the second filter 23a may be arranged outside the valve unit 20d as long as it is arranged closer to the compressor 10 than the fifth self-sealing joint 36. Good.
(Fifth modification of the first embodiment)
Next, a pulse tube refrigerator according to a fifth modification of the first embodiment of the present invention will be described with reference to FIG.

  FIG. 6 is a diagram schematically showing the configuration of the pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is a four-valve type two-stage pulse tube refrigerator, and is different from the pulse tube refrigerator according to the third modification of the first embodiment.

  Referring to FIG. 6, in the third modification of the first embodiment, the pulse tube refrigerator is different from the one in which each of the regenerator tube and the pulse tube is provided in one stage. The machine 100e includes two stages of cold storage tubes and pulse tubes.

  As shown in FIG. 6, the pulse tube refrigerator 100e according to the present modification has the same configuration as that of the first embodiment except for the expander 40e, the valve unit 20e, and the sixth self-sealing joint 37. This is the same as the modification.

  The expander 40e includes a first regenerator tube 41, a second regenerator tube 41a, a first pulse tube 42, a second pulse tube 42a, a cryogenic vessel 43e, a flange / pipe unit 44e, and second orifices 52 and 52b. Have

  In the second regenerator 41a, similarly to the first regenerator 41, helium gas, which is a refrigerant gas, refrigerates cold heat generated by repeated adiabatic expansion. The second cold storage tube 41a has a high temperature end side connected to the low temperature end side of the first cold storage tube 41 and a low temperature end side connected to the low temperature end side of the second pulse tube 42a. Similarly to the first pulse tube 42, the second pulse tube 42a generates cold by repeating adiabatic expansion of helium gas, which is a refrigerant gas supplied through the second regenerator tube 41a. The second pulse tube 42a has a high temperature end side connected to the flange / pipe unit 44e, and a low temperature end side connected to the low temperature end side of the second regenerator tube 41a.

  Similarly to the first pulse tube 42, the second pulse tube 42a has rectifiers 45a and 46a at the high temperature end and the low temperature end, respectively. The rectifiers 45a and 46a are for stabilizing the flow of the refrigerant gas in the second pulse tube 42a, similarly to the rectifiers 45 and 46 in the first pulse tube 42.

  The cryogenic vessel 43e is connected to the flange / pipe unit 44e via the first regenerative tube 41, the first pulse tube 42, the second pulse tube 42a, and the first cool storage tube 41. The second regenerator tube 41a connected to the is housed. The flange / pipe unit 44e has second orifices 52 and 52b. Furthermore, the first buffer 60 and the second buffer 60b are connected to the second orifices 52 and 52b of the flange / pipe unit 44e. The first buffer 60 and the second buffer 60b each have a function of a phase control mechanism that controls the phase difference between the refrigerant gas pressure fluctuation and the flow velocity fluctuation in the first pulse tube 42 and the second pulse tube 42a, respectively. .

  Unlike the third modification of the first embodiment, the valve unit 20c includes a third discharge side valve 21b, a third suction side valve 22b, a third filter 23b, and first orifices 51d and 51e. Have.

  The third discharge side valve 21b is coupled to the discharge side of the compressor 10 via a fifth coupling point P6 that is an intermediate point between the suction side of the first discharge side valve 21 and the first self-sealing joint 31. Then, the discharge side of the compressor 10 and the high temperature end side of the second pulse tube 42a are communicated or blocked. The third suction side valve 22b is coupled to the suction side of the compressor 10 via a sixth coupling point P7 which is an intermediate point between the discharge side of the first suction side valve 22 and the second self-sealing joint 32. Then, the high temperature end side of the second pulse tube 42a and the suction side of the compressor 10 are communicated or blocked. The third filter 23 b is provided between the discharge side of the third discharge side valve 21 b and the high temperature end side of the first pulse tube 42.

  Further, in the present modification, the third suction side valve 22b is connected to the third through a ninth coupling point P9 that is an intermediate point between the discharge side of the third discharge side valve 21b and the third filter 23b. It is provided to be coupled with the filter 23b. Accordingly, the third filter 23b is also provided between the high temperature end side of the second pulse tube 42a and the suction side of the third suction side valve 22b. With such a piping structure, the third discharge side valve 21b is opened and the third suction side valve 22b is closed, that is, the refrigerant gas flows from the high pressure pipe 11 to the high temperature end side of the second pulse tube 42a. In the discharged state, a filter can be provided between the third discharge side valve 21b and the high temperature end side of the second pulse tube 42a. In the state where the third discharge side valve 21b is closed and the third suction side valve 22b is opened, that is, in the state where the refrigerant gas is sucked into the low pressure pipe 12 from the low temperature end side of the second pulse tube 42a. A filter can be provided between the high temperature end side of the second pulse tube 42a and the third suction side valve 22b.

  The first orifice 51d is provided between the discharge side of the third discharge valve 21b and the ninth coupling point P9, and the first orifice 51e is connected to the ninth coupling point P9 and the third coupling point P9. It is provided between the suction side of the suction side valve 22b. Therefore, the flow rate of the refrigerant gas flowing from the third discharge side valve 21b to the high temperature end side of the second pulse tube 42a is limited by the first orifice 51d, and the refrigerant gas flows from the high temperature end side of the second pulse tube 42a to the second temperature. The flow rate of the refrigerant gas flowing out to the three suction side valves 22b is restricted by the first orifice 51e.

  In the flange / pipe unit 44e, the second orifice 52b includes a seventh coupling point P10, which is an intermediate point between the third filter 23b and the high temperature end side of the second pulse tube 42a, and a second buffer 60b. Between. Therefore, a part of the refrigerant gas flowing in and out from the third filter 23b to the high temperature end side of the second pulse tube 42a is limited in flow rate by the second orifice 52b and flows into and out of the second buffer 60b.

  The sixth self-sealing joint 37 is provided between the second pulse tube 42a side of the third filter 23b and the high temperature end side of the second pulse tube 42a. In this modification, the sixth self-sealing joint 37 is provided between the valve unit 20e in which the third filter 23b is accommodated and the flange / pipe unit 44e.

  In the present modification, the effect of performing the refrigeration cooling of the pulse tube refrigerator 100e, the effect of removing the abrasion powder by the filter, and the effect of performing the maintenance work of the filter without increasing the temperature of the refrigerator are as follows. This is different from the third modification of the first embodiment.

  First, the effect | action which performs the freezing cooling of a pulse tube refrigerator is demonstrated focusing on a different point from the 3rd modification of 1st Embodiment.

  In the pulse tube refrigerator 100e having the above configuration, cold heat generated by adiabatic expansion of the refrigerant gas in the first pulse tube 42 as the refrigerant gas is supplied / recovered from the high temperature end side of the first cold storage tube 41. Is stored in the first regenerator tube 41, the low temperature end side of the first regenerator tube 41 is cooled, and the first orifices 51b and 51c, the second orifice 52, the first buffer 60, the second The discharge side valve 21a and the second suction side valve 22a can be used to increase the phase difference between the pressure change and the flow rate change in the first pulse tube 42, thereby improving the refrigerating capacity. This is the same as the third modification of the embodiment. As a result, a low temperature of, for example, about 40 K can be obtained on the low temperature end side of the first regenerator tube 41.

  Furthermore, in this modification, since it is a two-stage pulse tube refrigerator, for example, the high temperature end side of the second regenerative tube 41a connected to the low temperature end side of the first regenerative tube 41 that has reached a low temperature of about 40K. The refrigerant gas is supplied / recovered from the refrigerant, the cold heat generated by the adiabatic expansion of the refrigerant gas in the second pulse tube 42a is stored in the second cold storage tube 41a, and the low temperature end side of the second cold storage tube 41a is cooled. . Similarly to the third modification of the first embodiment, the first orifices 51d and 51e, the second orifice 52b, the second buffer 60b, the third discharge side valve 21b, and the third suction port. The side valve 22b is used to increase the phase difference between the pressure change and the flow rate change in the second pulse tube 42a, and the amount of work in which the refrigerator generates cold when the refrigerant gas is repeatedly compressed and expanded is increased. , Refrigeration capacity can be improved. As a result, a low temperature of, for example, about 4K can be obtained on the low temperature end side of the second regenerative tube 41a.

  Next, the effect | action which a filter removes abrasion powder is demonstrated focusing on a different point from the 3rd modification of 1st Embodiment.

  The first filter 23 and the second filter 23a generate wear powder generated in the first discharge side valve 21, the first suction side valve 22, the second discharge side valve 21a, and the second suction side valve 22a. The removing action is the same as that of the third modification of the first embodiment.

  On the other hand, a third filter 23b is provided between the discharge side of the third discharge side valve 21b and the high temperature end side of the second pulse tube 42a, and wear powder is removed by the third filter 23b. No wear powder enters the second pulse tube 42a.

  Note that the wear powder generated in the third suction side valve 22b hardly moves to the second pulse tube 42a side because the flow direction of the refrigerant gas is reverse, but partially moves in the reverse direction. Even if there is, the abrasion powder is removed by the third filter 23b. Further, in the third filter 23b, since the refrigerant gas flows in both directions, there is little possibility that the abrasion powder will clog the filter.

  Next, an operation capable of performing the filter maintenance operation without raising the temperature of the refrigerator will be described focusing on differences from the third modification of the first embodiment.

  The maintenance work of the pulse tube refrigerator 100e stops the operation of the pulse tube refrigerator 100e, and the first self-sealing joint 31, the second self-sealing joint 32, the third self-sealing joint 33, and the fifth self-sealing. In addition to releasing the coupling of the joint 36, the coupling of the sixth self-sealing joint 37 is released, and the valve unit 20e is separated from the compressor 10 and the expander 40e. At this time, similarly to the third modification of the first embodiment, only the valve unit 20e can be separated without allowing air and impurities to enter the compressor 10 and the expander 40e.

  Next, the valve unit 20e is disassembled, and the first filter 23, the second filter 23a, the third filter 23b, and the first orifices 51b, 51c, 51d, 51e are taken out and are new or have been cleaned. The valve unit 20e is assembled, the valve unit 20e is replaced with refrigerant gas, the first self-sealing joint 31, the second self-sealing joint 32, the third self-sealing joint 33, and the fifth self-sealing. The joint 36 and the sixth self-sealing joint 37 are joined, and the valve unit 20e is connected to the compressor 10 and the expander 40e. At this time, similarly to the third modification of the first embodiment, the valve unit 20e can be connected without allowing air and impurities to enter the compressor 10 and the expander 40e.

  In addition, the first filter 23, the second filter 23 a, the third filter 23 b, and the second filter 23 e are not required to increase the temperature of the expander 40 e to room temperature, and without introducing impurities into the compressor 10. The maintenance work for one orifice 51b, 51c, 51d, 51e can be performed in the same manner as the third modification of the first embodiment.

  As described above, according to the pulse tube refrigerator according to the present modified example, a filter that removes wear powder and an orifice on which wear powder easily accumulates can be used in a two-stage pulse tube refrigerator using a self-sealing joint. Therefore, the maintenance work for the filter and the orifice can be performed without performing the temperature raising operation for raising the temperature of the pulse tube refrigerator to room temperature and the gas replacement operation for replacing the gas.

In the present modification, the third filter 23b and the first orifices 51d and 51e are arranged outside the valve unit 20e if they are arranged on the compressor 10 side from the sixth self-sealing joint 37. It may be configured to be.
(Sixth modification of the first embodiment)
Next, a pulse tube refrigerator according to a sixth modification of the first embodiment of the present invention will be described with reference to FIG.

  FIG. 7 is a diagram schematically showing the configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the first embodiment in that the first filter is detachably connected to the valve unit using a self-sealing joint.

  Referring to FIG. 7, in the first embodiment, the first filter is different from the valve unit that cannot be separated using a self-sealing joint, and the pulse tube refrigerator 100f according to the present modification is different. The first filter 23 is provided outside the valve unit 20f and is detachably connected from the valve unit 20f using the eighth self-sealing joint 38.

  As shown in FIG. 7, the configuration of the pulse tube refrigerator 100f according to this modification is the same as that of the first embodiment except for the valve unit 20f and the eighth self-sealing joint 38.

  Unlike the first embodiment, the valve unit 20f does not include the first filter 23 inside. The first filter 23 is disposed outside the valve unit 20f.

  The eighth self-sealing joint 38 is provided between the first coupling point P1 and the first filter 23 on the compressor 10 side. In the present modification, the eighth self-sealing joint 38 is provided between the valve unit 20f and the first filter 23 on the compressor 10 side.

  In this modification, the effect | action which performs the freezing cooling of the pulse tube refrigerator 100f, and the effect | action that a filter removes abrasion powder are the same as 1st Embodiment. However, the operation capable of performing the maintenance work of the filter without raising the temperature of the refrigerator is different from that of the first embodiment in the following points.

  Maintenance work of the pulse tube refrigerator 100f stops the operation of the pulse tube refrigerator 100f and releases the coupling of the first self-sealing joint 31, the second self-sealing joint 32, and the third self-sealing joint 33. In addition, the coupling of the eighth self-sealing joint 38 is released, and the valve unit 20f and the first filter 23 are independently separated from the compressor 10 and the expander 40f. Thereafter, without disassembling the valve unit 20f, only the first filter 23 is replaced with a new one, the inside of the first filter 23 is replaced with refrigerant gas, and the first self-sealing joint 31 and the second self-sealing joint are replaced. 32, the third self-sealing joint 33 and the eighth self-sealing joint 38 are coupled, and the valve unit 20f and the first filter 23 are connected to the compressor 10 and the expander 40f.

  Therefore, by separating the first filter 23 alone, the operation of disassembling, assembling, and replacing the gas of the valve unit 20f becomes unnecessary, and the time required for filter maintenance can be further reduced.

In the present modification, the first filter 23 may be arranged inside the valve unit 20f together with the eighth self-sealing joint 38.
(Seventh Modification of First Embodiment)
Next, with reference to FIG. 8, a pulse tube refrigerator according to a seventh modification of the first embodiment of the present invention will be described.

  FIG. 8 is a diagram schematically showing the configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is the first embodiment in that the first filter, the first orifice, and the second orifice are detachably connected to the valve unit using a self-sealing joint. This is different from the pulse tube refrigerator according to the second modification.

  Referring to FIG. 8, in the second modification of the first embodiment, the first filter, the first orifice, and the second orifice may be separated from the valve unit using a self-sealing joint. Unlike the case where the pulse tube refrigerator 100g according to the present modification is not capable, the first filter 23, the first orifice 51a and the second orifice 52a are provided outside the valve unit 20g, and the eighth self A seal joint 38 is used so as to be separable from the valve unit 20g.

  As shown in FIG. 8, the pulse tube refrigerator 100g according to the present modification has the same configuration as the second modification of the first embodiment except for the valve unit 20g and the eighth self-sealing joint 38. It is.

  Unlike the second modification of the first embodiment, the valve unit 20g does not include the first filter 23, the first orifice 51a, and the second orifice 52a inside. The first filter 23, the first orifice 51a, and the second orifice 52a are disposed outside the valve unit 20g.

  The eighth self-sealing joint 38 is between the first coupling point P1 and the compressor 10 side of the first filter 23, and between the valve unit 20g and the compressor 10 side of the first filter 23. Is provided in the same manner as the sixth modification of the first embodiment.

  In this modification, the effect | action which performs the freezing cooling of the pulse tube refrigerator 100g, and the effect | action that a filter removes abrasion powder are the same as the 2nd modification of 1st Embodiment. However, the operation capable of performing the maintenance work of the filter without raising the temperature of the refrigerator is different from the second modification of the first embodiment in the following points.

  The maintenance work of the pulse tube refrigerator 100g stops the operation of the pulse tube refrigerator 100g, the first self seal joint 31, the second self seal joint 32, the third self seal joint 33, the self seal joint 34, and In addition to releasing the connection of the fourth self-seal joint 35, the connection of the eighth self-seal joint 38 is also released, and the valve unit 20g, the first filter 23, the first filter from the compressor 10 and the expander 40g are released. The orifice 51a and the second orifice 52a are separated independently. Thereafter, without disassembling the valve unit 20, the first filter 23, the first orifice 51a and the second orifice 52a are replaced with new ones, replaced with refrigerant gas, and the first self-sealing joint 31, second The self-sealing joint 32, the third self-sealing joint 33, the self-sealing joint 34, the fourth self-sealing joint 35, and the eighth self-sealing joint 38 are combined, and the valve unit 20g is connected to the compressor 10 and the expander 40g. Connecting.

  Accordingly, by separating the first filter 23, the first orifice 51a, and the second orifice 52a independently, it is not necessary to disassemble, assemble, or replace the gas of the valve unit 20g. Can be shortened.

In this modification, the first filter 23, the first orifice 51a, and the second orifice 52a may be arranged inside the valve unit 20g together with the eighth self-sealing joint 38. Good.
(Eighth modification of the first embodiment)
Next, a pulse tube refrigerator according to an eighth modification of the first embodiment of the present invention will be described with reference to FIG.

  FIG. 9 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is the fourth modification of the first embodiment in that the first filter and the second filter are detachably connected to the valve unit using a self-sealing joint. It differs from the pulse tube refrigerator according to the example.

  Referring to FIG. 9, in the fourth modification of the first embodiment, the first filter and the second filter are different from the valve unit that cannot be separated using a self-sealing joint. In the pulse tube refrigerator 100h according to this modification, the first filter 23 and the second filter 23a are provided outside the valve unit 20h, and separated from the valve unit 20h using the eighth self-sealing joint 38. Connected as possible.

  As shown in FIG. 7, the pulse tube refrigerator 100h according to the present modification has the same configuration as the first embodiment except for the valve unit 20h, the eighth self-seal joint 38, and the ninth self-seal joint 39. This is the same as the fourth modification.

  Unlike the first embodiment, the valve unit 20h does not include the first filter 23 and the second filter 23a inside. The first filter 23 and the second filter 23a are disposed outside the valve unit 20h.

  The eighth self-sealing joint 38 is between the first coupling point P1 and the compressor 10 side of the first filter 23, and between the valve unit 20h and the compressor 10 side of the first filter 23. Is provided in the same manner as the sixth modification of the first embodiment. The ninth self-sealing joint 39 is provided between the discharge side of the second discharge side valve 21a and the suction side of the second filter 23a.

  In this modification, the effect | action which performs the freezing cooling of the pulse tube refrigerator 100h, and the effect | action that a filter removes abrasion powder are the same as the 4th modification of 1st Embodiment. However, the operation capable of performing the filter maintenance work without raising the temperature of the refrigerator is different from the fourth modification of the first embodiment in the following points.

  Maintenance work of the pulse tube refrigerator 100h stops the operation of the pulse tube refrigerator 100h, and the first self seal joint 31, the second self seal joint 32, the third self seal joint 33, and the fifth self seal. In addition to releasing the coupling of the couplings 36 and 36a, the coupling of the eighth self-sealing coupling 38 and the ninth self-sealing coupling 39 is also released, and the valve unit 20h and the first filter from the compressor 10 and the expander 40h are released. 23 and the second filter 23a are separated independently. After that, without disassembling the valve unit 20h, the first filter 23 and the second filter 23a are replaced with new ones and replaced with refrigerant gas, the first self-sealing joint 31, the second self-sealing joint 32, The third self-seal joint 33, the fifth self-seal joint 36, 36a, the eighth self-seal joint 38, and the ninth self-seal joint 39 are coupled, and the valve unit 20h is connected to the compressor 10 and the expander 40h. To do.

  Accordingly, by separating the first filter 23, the first orifice 51a, and the second orifice 52a independently, it is not necessary to disassemble, assemble, or replace the gas of the valve unit 20h. Can be shortened.

In the present embodiment, the first filter 23 and the second filter 23a are arranged inside the valve unit 20h together with the eighth self-sealing joint 38 and the ninth self-sealing joint 39. May be.
(Second Embodiment)
With reference to FIG. 10, the cool storage type refrigerator which concerns on the 2nd Embodiment of this invention is demonstrated.

  FIG. 10 is a diagram schematically showing the configuration of the cold storage type refrigerator according to the present embodiment.

  As shown in FIG. 10, the regenerative refrigerator 110 according to the present embodiment includes a compressor 10, a valve unit 20, and an expander 70. The regenerative refrigerator 110 is a one-stage GM refrigerator.

  The compressor 10 is the same as that of the first embodiment. That is, the high pressure pipe 11 is provided on the discharge side, and the low pressure pipe 12 is provided on the suction side. After the refrigerant gas is recovered from the expander 70 through the low pressure pipe 12 and compressed, the refrigerant gas is supplied to the expander 70 through the high pressure pipe 11. .

  The valve unit 20 is the same as that in the first embodiment. That is, the discharge side valve 21 that communicates or blocks the discharge side of the compressor 10 and the high temperature end side of the cold storage pipe 71, and the first provided between the discharge side of the discharge side valve 21 and the high temperature end side of the cold storage pipe 71 The first filter 23 is coupled to the first filter 23 through a coupling point P1 that is an intermediate point between the discharge side of the first filter 23 and the discharge side valve 21 and the first filter 23, and the compressor 10 A suction side valve 22 that communicates with or shuts off the suction side, and is connected between the compressor 10 and the expander 40 to alternately connect the high pressure pipe 11 and the low pressure pipe 12 to the expander 70.

  The expander 70 includes a cold storage pipe 71, a cylinder 72, a cryogenic container 73, and a flange / power chamber unit 74.

  The cold storage pipe 71 stores cold heat generated by repeated adiabatic expansion of helium gas, which is a refrigerant gas, and functions as a displacer because it is a cold storage pipe for a GM refrigerator. The cold storage pipe 71 is connected to the motor 76 of the flange / pipe unit 74 at the high temperature end side using the connecting member 75 and is inserted into the cylinder 72.

  The cylinder 72 is connected to the flange / power chamber unit 74 at the high temperature end side and is accommodated in the low temperature container 73. The cylinder 72 is for adiabatic expansion of the refrigerant gas. The cylinder 72 forms a first expansion space 77 between the high temperature end side of the cylinder 72 and the high temperature end side of the cold storage pipe 71, and the low temperature end side of the cylinder 72. And a second expansion space 78 is formed between the cold storage pipe 71 and the low temperature end side. The first expansion space 77 communicates with the second expansion space 78 through the inside of the cold storage pipe 71. The first expansion space 77 is connected to the third filter 23 through a pipe in the flange / power chamber unit 74.

  The first self-sealing joint 31 is provided between the discharge side of the compressor 10 and the suction side of the discharge side valve 21. In the present embodiment, the first self-sealing joint 31 is provided at a position where the high-pressure pipe 11 on the discharge side of the compressor 10 and the valve unit 20 in which the discharge-side valve 21 is accommodated are connected.

  The second self-sealing joint 32 is provided between the discharge side of the suction side valve 22 and the suction side of the compressor 10. In the present embodiment, the second self-sealing joint 32 is provided at a position where the valve unit 20 in which the suction side valve 22 is accommodated and the low pressure pipe 12 on the suction side of the compressor 10 are connected.

  The third self-sealing joint 33 is provided between the cold storage tube 71 side of the first filter 23 and the high temperature end side of the cold storage tube 71. In the present embodiment, the third self-sealing joint 33 is provided between the valve unit 20 in which the first filter 23 is accommodated and the flange / power chamber unit 74.

  Next, the effect | action which performs the freezing cooling of the cool storage type | mold refrigerator 110, the effect | action which a filter removes abrasion powder, and the effect | action which can perform the maintenance operation | work of a filter, without heating up a refrigerator are demonstrated.

  First, the effect | action which performs the refrigerating cooling of the cool storage type refrigerator 110 is demonstrated.

  The regenerative refrigerator 110 having the above-described configuration repeats the operation of connecting the discharge side valve 21 and the suction side valve 22 accommodated in the valve unit 20 and the operation of shutting it off so that the operations are opposite to each other. Then, the first expansion space 77 and the second expansion space 78 are switched and communicated with the high pressure pipe 11 or the low pressure pipe 12, and a pressure change is generated. Further, the regenerator tube 71 is moved up and down via the connecting member 75 using the motor 76. Then, a volume change occurs in the first expansion space 77 and the second expansion space 78. As a result, the adiabatic expansion of the refrigerant gas occurs in the first expansion space 77 and the second expansion space 78, and the cold heat generated at that time is stored in the regenerator tube 71, so that the low temperature end side of the regenerator tube 71 is To be cooled.

  Further, the action of the filter for removing the wear powder and the action of performing the maintenance work of the filter without raising the temperature of the refrigerator are the same as those in the first embodiment. That is, the maintenance work of the first filter 23 can be performed without requiring time to raise the temperature of the expander 70 to room temperature and without introducing impurities into the compressor 10.

  As described above, according to the regenerative refrigerator according to the present embodiment, the filter that removes the abrasion powder generated in the valve is connected between the compressor and the expander using the self-sealing joint. As in the case of the machine, the maintenance work of the filter can be performed without performing the temperature raising operation for raising the temperature of the regenerative refrigerator to room temperature and the gas substitution operation for replacing the gas.

Also in the present embodiment, the first filter 23 is configured to be disposed outside the valve unit 20 as long as it is disposed closer to the compressor 10 than the third self-sealing joint 33. May be.
(Third embodiment)
Next, a pulse tube refrigerator according to a third embodiment of the present invention will be described with reference to FIG.

  FIG. 11 is a diagram schematically showing the configuration of the pulse tube refrigerator according to the present embodiment.

  The pulse tube refrigerator according to the present embodiment is different from the pulse tube refrigerator according to the first embodiment in that the first buffer is stored in the valve unit.

  Referring to FIG. 11, the first embodiment is different from the first embodiment in that the first buffer is separated from the parts other than the first buffer including the valve unit of the pulse tube refrigerator. In the pulse tube refrigerator 300 according to the above, the first buffer is stored in the valve unit and integrated.

  The pulse tube refrigerator 300 is a one-stage pulse tube refrigerator, and includes a compressor 10, a valve unit 120, and an expander 40.

  The compressor 10 is the same as that of the first embodiment. That is, the high pressure pipe 11 is provided on the discharge side and the low pressure pipe 12 is provided on the suction side. After the refrigerant gas is recovered from the expander 40 through the low pressure pipe 12 and compressed, the refrigerant gas is supplied to the expander 40 through the high pressure pipe 11. .

  The expander 40 is also the same as that in the first embodiment. That is, the first regenerative tube 41, the first pulse tube 42, the cryogenic vessel 43, the flange / pipe unit 44, the first orifice 51, and the second orifice 52 are provided.

  On the other hand, the valve unit 120 is different from that of the first embodiment. That is, the first discharge side valve 21 that connects or blocks the discharge side of the compressor 10 and the high temperature end side of the first regenerator tube 41, the discharge side of the first discharge side valve 21, and the first regenerator tube 41. The first filter 23 is provided between the first filter 23 and the first filter 23 provided between the first filter 23 and the first filter 23, which is an intermediate point between the discharge side of the discharge side valve 21 and the first filter 23. The suction side valve 22 is connected to the high temperature end side of the first regenerative tube 41 and the suction side of the compressor 10 is connected or cut off, which is the same as in the first embodiment. The first buffer 60 is provided for controlling the phase difference between the pressure fluctuation and the flow speed fluctuation of the refrigerant gas in the first pulse tube 42 by allowing the refrigerant gas to flow into and out of the first pulse tube 42.

  The valve unit 120 uses four self-seal joints of a first self-seal joint 31, a second self-seal joint 32, a third self-seal joint 33, and a fourth self-seal joint 35. It is connected so as to be separable from the machine 40. The first self-sealing joint 31, the second self-sealing joint 32, and the third self-sealing joint 33 are the same as those in the first embodiment. The first buffer 60 stored in the valve unit 120 is detachably connected to the flange / pipe unit 44 through the fourth self-sealing joint 35.

  The action of performing the freezing and cooling of the pulse tube refrigerator 300 in the present embodiment, the action of removing the wear powder by the first filter 23, and the action of performing the maintenance work of the filter without raising the temperature of the refrigerator. Is the same as in the first embodiment.

  In addition, the pulse tube refrigerator 300 according to the present embodiment has a structure in which the first buffer 60 is housed in the valve unit 120 and integrated. Although the volume of the 1st buffer 60 is not specifically limited, For example, it can be set as 0.5-1.0L. Therefore, compared to the structure in which the first buffer 60 is integrated with the flange / pipe unit 44 of the expander 40, the expander 40 can be reduced in size, particularly reduced in height. In addition, the pulse tube refrigerator 300 according to the present embodiment has an effect of reducing the installation area as compared with the pulse tube refrigerator according to the first embodiment in which the first buffer and the expander are separated. Have.

  Specifically, when the first buffer 60 is installed separately from the valve unit 20 in the first embodiment, the first buffer 60 having an installation area of 300 mm × 150 mm and the installation area of 300 mm × 150 mm. Therefore, a total installation area of 600 mm × 150 mm is required. However, when the first buffer 60 is stored in a configuration in which the first buffer 60 is stacked above the valve unit 120, the installation area is 300 mm. Only an installation area of × 150 mm is required, and the installation area is reduced.

As described above, according to the pulse tube refrigerator according to the present embodiment, the filter maintenance operation is performed without performing the temperature raising operation for raising the temperature of the pulse tube refrigerator to room temperature or the gas replacement operation for replacing the gas. In addition, the pulse tube refrigerator can be miniaturized.
(First modification of the third embodiment)
Next, a pulse tube refrigerator according to a first modification of the third embodiment of the present invention will be described with reference to FIG.

  FIG. 12 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is a four-valve type one-stage pulse tube refrigerator, which is different from the pulse tube refrigerator according to the third embodiment.

  Referring to FIG. 12, in the third embodiment, the high-temperature end side of the first pulse tube is different from being connected to the first discharge side valve and the first suction side valve. In the pulse tube refrigerator 300a according to the example, the high temperature end side of the first pulse tube 42 is connected to the second discharge side valve 21a and the second suction side valve 22a.

  That is, the pulse tube refrigerator 300a according to this modification corresponds to a configuration in which the first buffer is stored in the valve unit in the pulse tube refrigerator 100c according to the third modification of the first embodiment. Therefore, the valve unit 120a in the present modification has a structure in which the first buffer 60 is stored and integrated in the valve unit 20c in the third modification of the first embodiment. Is connected to the flange / pipe unit 44 through a fourth self-sealing joint 35 provided between the valve unit 120a and the expander 44c in a separable manner.

  In addition, the expander which comprises the pulse tube refrigerator 300a which concerns on this modification is the same as the expander 40c which comprises the pulse tube refrigerator 100c which concerns on the 3rd modification of 1st Embodiment.

Also in the pulse tube refrigerator 300a according to the present modification, the first buffer 60 is housed in the valve unit 120a and integrated, as in the pulse tube refrigerator 300 according to the third embodiment. Therefore, it is possible to perform maintenance work of the filter without raising the temperature of the pulse tube refrigerator to room temperature and performing the gas replacement operation of replacing the gas, and downsize the pulse tube refrigerator. be able to.
(Second modification of the third embodiment)
Next, with reference to FIG. 13, the pulse tube refrigerator which concerns on the 2nd modification of the 3rd Embodiment of this invention is demonstrated.

  FIG. 13 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the first modification of the third embodiment in that the second filter is connected only to the second discharge side valve. To do.

  Referring to FIG. 13, in the first modification of the third embodiment, the second filter is different from being switched and communicated with the second discharge side valve and the second suction side valve. In the pulse tube refrigerator 300b according to this modification, the second filter 23a is not connected to the second suction side valve 22a, but is connected only to the second discharge side valve 21a.

  That is, the pulse tube refrigerator 300b according to this modification corresponds to a configuration in which the first buffer is stored in the valve unit in the pulse tube refrigerator 100d according to the fourth modification of the first embodiment. Therefore, the valve unit 120b in the present modification has a structure in which the first buffer 60 is integrated with the valve unit 20d in the fourth modification of the first embodiment. Is connected to the flange / pipe unit 44 through a fourth self-sealing joint 35 provided between the valve unit 120b and the expander 44d in a separable manner.

  In addition, the expander which comprises the pulse tube refrigerator 300b which concerns on this modification is the same as the expander 40d which comprises the pulse tube refrigerator 100d which concerns on the 4th modification of 1st Embodiment.

Also in the pulse tube refrigerator 300b according to the present modification, the first buffer 60 is stored in the valve unit 120b and integrated with the pulse tube refrigerator 300 according to the third embodiment. Therefore, it is possible to perform maintenance work of the filter without raising the temperature of the pulse tube refrigerator to room temperature and performing the gas replacement operation of replacing the gas, and downsize the pulse tube refrigerator. be able to.
(Third Modification of Third Embodiment)
Next, with reference to FIG. 14, the pulse tube refrigerator which concerns on the 3rd modification of the 3rd Embodiment of this invention is demonstrated.

  FIG. 14 is a diagram schematically showing the configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the first modification of the third embodiment in that the fourth coupling point is inside the valve unit.

  Referring to FIG. 14, in the first modification of the third embodiment, the fourth coupling point is different from that in the flange / piping unit 44, and the pulse tube refrigerator according to this modification is different. In 300c, the fourth coupling point P3 is inside the valve unit 120c.

  Specifically, the first buffer 60 is provided by being coupled at a fourth coupling point P3 that is an intermediate point between the ejection side of the second ejection side valve 21a and the second filter 23a. Along with the second orifice 52 provided between the coupling point P3 and the first buffer 60, it is stored inside the valve unit 120c.

  In addition, the expander which comprises the pulse tube refrigerator 300c which concerns on this modification is the same as the expander 40b which comprises the pulse tube refrigerator 100b which concerns on the 2nd modification of 1st Embodiment.

  Also in the pulse tube refrigerator 300c according to this modification, the first buffer 60 is housed in the valve unit 120c and integrated with the same as in the pulse tube refrigerator 300 according to the third embodiment. Therefore, it is possible to perform maintenance work of the filter without raising the temperature of the pulse tube refrigerator to room temperature and performing the gas replacement operation of replacing the gas, and downsize the pulse tube refrigerator. be able to.

In this modification, the fourth coupling point P3 is located between the eighth coupling point P8 and the second filter 23a on the compressor 10 side, but the first pulse tube of the second filter 23a. It may be between the high temperature end side of 42 and the compressor 10 side of the fifth self-sealing joint 36. In this case, the first buffer can be joined at the fourth joining point.
(Fourth modification of the third embodiment)
Next, with reference to FIG. 15, the pulse tube refrigerator which concerns on the 4th modification of the 3rd Embodiment of this invention is demonstrated.

  FIG. 15 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is a four-valve type two-stage pulse tube refrigerator, and is different from the pulse tube refrigerator according to the third modification of the third embodiment.

  Referring to FIG. 15, in the third modification of the third embodiment, the pulse tube refrigerator is different from that provided with one stage each of the regenerator tube and the pulse tube, and the pulse tube refrigeration according to the present modification example. The machine 300d includes two stages of cold storage tubes and pulse tubes.

  Specifically, the first buffer 60 is provided by being coupled at a fourth coupling point P3 that is an intermediate point between the ejection side of the second ejection side valve 21a and the second filter 23a. Along with the second orifice 52 provided between the coupling point P3 and the first buffer 60, it is stored inside the valve unit 120d.

In the pulse tube refrigerator 300d according to the present modification, as in the pulse tube refrigerator 300 according to the third embodiment, the first buffer 60 is stored in the valve unit 120d and integrated. Therefore, it is possible to perform maintenance work of the filter without raising the temperature of the pulse tube refrigerator to room temperature and performing the gas replacement operation of replacing the gas, and downsize the pulse tube refrigerator. be able to.
(Fifth modification of the third embodiment)
Next, with reference to FIG. 16, a pulse tube refrigerator according to a fifth modification of the third embodiment of the present invention will be described.

  FIG. 16 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the fourth modification of the third embodiment in that the second buffer is also stored in the valve unit.

  Referring to FIG. 16, in the fourth modification example of the third embodiment, the second buffer corresponding to the second pulse tube is different from the outside of the valve unit, and according to this modification example. In the pulse tube refrigerator 300e, the second buffer 60b corresponding to the second pulse tube 42a is stored in the valve unit 120e.

  Specifically, the first buffer 60 is provided by being coupled at a fourth coupling point P3 that is an intermediate point between the ejection side of the second ejection side valve 21a and the second filter 23a. Along with the second orifice 52 provided between the coupling point P3 and the first buffer 60, it is stored inside the valve unit 120d. Similarly, the second buffer 60b is provided by being coupled at a seventh coupling point P10 that is an intermediate point between the ejection side of the third ejection side valve 21b and the third filter 23b. Along with the second orifice 52b provided between P10 and the second buffer 60b, the valve unit 120e is stored.

In the pulse tube refrigerator 300e according to this modification, the first buffer 60 is housed in the valve unit 120e together with the second buffer 60b so that the temperature is raised to room temperature. The filter maintenance operation can be performed without performing the temperature raising operation for heating and the gas replacement operation for replacing gas, and the pulse tube refrigerator can be miniaturized.
(Sixth modification of the third embodiment)
Next, with reference to FIG. 17, the pulse tube refrigerator which concerns on the 6th modification of the 3rd Embodiment of this invention is demonstrated.

  FIG. 17 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the third embodiment in that the first filter is detachably connected to the valve unit using a self-sealing joint.

  Referring to FIG. 17, in the third embodiment, the first filter is different from the valve unit that cannot be separated using a self-sealing joint, and the pulse tube refrigerator 300f according to the present modification is different. The first filter 23 is provided outside the valve unit 120f and is detachably connected from the valve unit 120f using the eighth self-sealing joint 38.

  The configuration of the pulse tube refrigerator 300f according to this modification is the same as that of the third embodiment except for the valve unit 120f and the eighth self-sealing joint 38.

  Unlike the third embodiment, the valve unit 120f does not include the first filter 23 inside. The first filter 23 is disposed outside the valve unit 120f.

  The eighth self-sealing joint 38 is provided between the first coupling point P1 and the first filter 23 on the compressor 10 side. In the present modification, the eighth self-sealing joint 38 is provided between the valve unit 120f and the compressor 10 side of the first filter 23.

In the pulse tube refrigerator 300f according to this modification, the first filter 23 is separated separately, so that the operation of disassembling, assembling, and replacing the gas of the valve unit 120f becomes unnecessary. The time can be shortened and the pulse tube refrigerator can be miniaturized by storing the first buffer 60 in the valve unit 120f.
(Seventh Modification of Third Embodiment)
Next, with reference to FIG. 18, the pulse tube refrigerator which concerns on the 7th modification of the 3rd Embodiment of this invention is demonstrated.

  FIG. 18 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is the first modification of the third embodiment in that the first filter and the second filter are detachably connected to the valve unit using a self-sealing joint. It differs from the pulse tube refrigerator according to the example.

  Referring to FIG. 18, in the first modification of the third embodiment, the first filter and the second filter are different from those stored in the valve unit, and the pulse tube refrigeration according to this modification is used. In the machine 300g, the first filter 23 and the second filter 23a are provided outside the valve unit 120g, and can be separated from the valve unit 120g using the eighth self-sealing joint 38 and the ninth self-sealing joint 39. Connected to.

  As shown in FIG. 18, the pulse tube refrigerator 300g according to the present modification has the same configuration as that of the third embodiment except for the valve unit 120g, the eighth self-seal joint 38, and the ninth self-seal joint 39. This is the same as the first modification.

  Unlike the first modification of the third embodiment, the valve unit 120g does not include the first filter 23 and the second filter 23a inside. The first filter 23 and the second filter 23a are disposed outside the valve unit 120g.

  The eighth self-sealing joint 38 is between the first coupling point P1 and the compressor 10 side of the first filter 23, and between the valve unit 120g and the compressor 10 side of the first filter 23. Is provided in the same manner as the sixth modification of the third embodiment. The ninth self-sealing joint 39 is provided between the eighth coupling point P8 and the second filter 23a on the compressor 10 side.

In the pulse tube refrigerator 300g according to this modification, the first filter 23 and the second filter 23a are separated separately, so that the operation of disassembling, assembling, and replacing the gas of the valve unit 120g is unnecessary. Furthermore, the filter maintenance time can be shortened, and the pulse tube refrigerator can be reduced in size by storing the first buffer 60 in the valve unit 120g.
(Eighth modification of the third embodiment)
Next, with reference to FIG. 19, the pulse tube refrigerator which concerns on the 8th modification of the 3rd Embodiment of this invention is demonstrated.

  FIG. 19 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is the second modification of the third embodiment in that the first filter and the second filter are detachably connected to the valve unit using a self-sealing joint. It differs from the pulse tube refrigerator according to the example.

  Referring to FIG. 19, in the second modification of the third embodiment, the first filter and the second filter are different from the valve unit that cannot be separated using a self-sealing joint. In the pulse tube refrigerator 300h according to this modification, the first filter 23 and the second filter 23a are provided outside the valve unit 120h, and the eighth self-seal joint 38 and the ninth self-seal joint 39 are provided. Is connected to the valve unit 120h in a separable manner.

  As shown in FIG. 19, the pulse tube refrigerator 300h according to the present modification has the same configuration as that of the third embodiment except for the valve unit 120h, the eighth self-sealing joint 38, and the ninth self-sealing joint 39. This is the same as the second modified example.

  Unlike the second modification of the third embodiment, the valve unit 120h does not include the first filter 23 and the second filter 23a inside. The first filter 23 and the second filter 23a are provided outside the valve unit 120h.

  The eighth self-sealing joint 38 is between the first coupling point P1 and the compressor 10 side of the first filter 23, and between the valve unit 120h and the compressor 10 side of the first filter 23. Is provided in the same manner as the sixth modification of the third embodiment. Further, the ninth self-sealing joint 39 is provided between the discharge side of the second discharge side valve 21a and the suction side of the second filter 23a, as in the seventh modification of the third embodiment. Provided.

In the pulse tube refrigerator 300h according to this modification, the first filter 23 and the second filter 23a are separated separately, so that the operation of disassembling, assembling, and replacing the gas of the valve unit 120h is unnecessary. Furthermore, the time required for filter maintenance can be shortened, and the pulse tube refrigerator can be reduced in size by storing the first buffer 60 in the valve unit 120h.
(Ninth Modification of Third Embodiment)
Next, with reference to FIG. 20, the pulse tube refrigerator which concerns on the 9th modification of the 3rd Embodiment of this invention is demonstrated.

  FIG. 20 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is the third modification of the third embodiment in that the first filter and the second filter are separably connected to the valve unit using a self-sealing joint. It differs from the pulse tube refrigerator according to the example.

  Referring to FIG. 20, in the third modification of the third embodiment, the first filter and the second filter are different from the valve unit that cannot be separated using a self-sealing joint. In the pulse tube refrigerator 300i according to this modification, the first filter 23 and the second filter 23a are provided outside the valve unit 120i, and the eighth self-seal joint 38 and the ninth self-seal joint 39 are provided. Is separably connected from the valve unit 120i.

  As shown in FIG. 20, the pulse tube refrigerator 300i according to the present modification has the same configuration as that of the third embodiment except for the valve unit 120i, the eighth self-sealing joint 38, and the ninth self-sealing joint 39. This is the same as the third modification.

  Unlike the third modification of the third embodiment, the valve unit 120i does not include the first filter 23 and the second filter 23a inside. The first filter 23 and the second filter 23a are provided outside the valve unit 120i.

  The eighth self-sealing joint 38 is between the first coupling point P1 and the compressor 10 side of the first filter 23, and between the valve unit 120i and the compressor 10 side of the first filter 23. Is provided in the same manner as the sixth modification of the third embodiment. The ninth self-sealing joint 39 is provided between the fourth coupling point P3 and the suction side of the second filter 23a.

In the pulse tube refrigerator 300i according to this modification, the first filter 23 and the second filter 23a are separated separately, so that the operation of disassembling, assembling, and replacing the gas of the valve unit 120i becomes unnecessary. Furthermore, the time required for filter maintenance can be shortened, and the pulse tube refrigerator can be downsized by storing the first buffer 60 in the valve unit 120i.
(10th modification of 3rd Embodiment)
Next, with reference to FIG. 21, a pulse tube refrigerator according to a tenth modification of the third embodiment of the present invention will be described.

  FIG. 21 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is the third embodiment in that the first filter, the second filter, and the third filter are detachably connected to the valve unit using a self-sealing joint. This is different from the pulse tube refrigerator according to the fourth modification.

  Referring to FIG. 21, in the fourth modification of the third embodiment, the first filter, the second filter, and the third filter may be separated from the valve unit using a self-sealing joint. Unlike the above, the pulse tube refrigerator 300j according to the present modification includes the first filter 23, the second filter 23a, and the third filter 23b provided outside the valve unit 120j, and an eighth self The seal joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a are detachably connected from the valve unit 120j.

  As shown in FIG. 21, the pulse tube refrigerator 300j according to the present modification has a third configuration other than the eighth self-sealing joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a. This is the same as the fourth modification of the embodiment.

  Unlike the fourth modification of the third embodiment, the valve unit 120j does not include the eighth self-sealing joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a. The eighth self-sealing joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a are provided outside the valve unit 120i.

  The eighth self-sealing joint 38 is between the first coupling point P1 and the compressor 10 side of the first filter 23, and between the valve unit 120j and the compressor 10 side of the first filter 23. Is provided in the same manner as the sixth modification of the third embodiment. The ninth self-sealing joint 39 is provided between the fourth coupling point P3 and the compressor 10 side of the second filter 23a. Further, the tenth self-sealing joint 39a is provided between the ninth coupling point P9 and the third filter 23b on the compressor 10 side.

In the pulse tube refrigerator 300j according to this modification, the first filter 23, the second filter 23a, and the third filter 23b are separated separately, so that the valve unit 120j is disassembled, assembled, and replaced with gas. Therefore, the filter maintenance operation time can be further reduced, and the pulse tube refrigerator can be downsized by storing the first buffer 60 in the valve unit 120j.
(Eleventh modification of the third embodiment)
Next, with reference to FIG. 22, a pulse tube refrigerator according to an eleventh modification of the third embodiment of the present invention will be described.

  FIG. 22 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is the third embodiment in that the first filter, the second filter, and the third filter are detachably connected to the valve unit using a self-sealing joint. This is different from the pulse tube refrigerator according to the fifth modification.

  Referring to FIG. 22, in the fifth modification of the third embodiment, the first filter, the second filter, and the third filter may be separated from the valve unit using a self-sealing joint. Unlike the case where the pulse tube refrigerator 300k according to this modification is not possible, the first filter 23, the second filter 23a, and the third filter 23b are provided outside the valve unit 120k, and the eighth self The valve unit 120k is separably connected using the seal joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a.

  As shown in FIG. 22, the pulse tube refrigerator 300k according to the present modification includes a third configuration other than the eighth self-sealing joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a. This is the same as the fifth modification of the embodiment.

  Unlike the fifth modification of the third embodiment, the valve unit 120k does not include the eighth self-sealing joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a. The eighth self-sealing joint 38, the ninth self-sealing joint 39, and the tenth self-sealing joint 39a are provided outside the valve unit 120k.

  An eighth self-sealing joint 38 is provided between the first coupling point P1 and the compressor 10 side of the first filter 23, and a ninth self-sealing joint 39 is provided between the fourth coupling point P3 and the second coupling point P3. The tenth self-sealing joint 39a is provided between the ninth coupling point P9 and the third filter 23b on the compressor 10 side. This is the same as the tenth modification of the third embodiment.

In the pulse tube refrigerator 300k according to this modification, the first filter 23, the second filter 22, and the third filter are separated separately, so that the valve unit 120k can be disassembled, assembled, and replaced with gas. Since it becomes unnecessary, the maintenance work time of the filter can be further shortened, and the pulse tube refrigerator can be miniaturized by storing the first buffer 60 in the valve unit 120k.
(Twelfth modification of the third embodiment)
Next, a pulse tube refrigerator according to a twelfth modification of the third embodiment of the present invention will be described with reference to FIG.

  FIG. 23 is a diagram schematically showing the configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the third embodiment in that it does not include the first filter.

  Referring to FIG. 23, unlike the third embodiment including the first filter, the pulse tube refrigerator 300l according to the present modification does not include the first filter 23.

  As shown in FIG. 23, the configuration of the pulse tube refrigerator 300l according to this modification is the same as that of the third embodiment except for the valve unit 120l.

  Unlike the third embodiment, the valve unit 120l does not include the first filter inside. Accordingly, the first discharge side valve 21 and the first suction side valve 22 stored in the valve unit 120l are detachably connected to the expander 40 via the third self-sealing joint 33.

  Since the first filter is not included in the pulse tube refrigerator 300l according to this modification, the expander includes the abrasion powder generated in the first discharge side valve 21 and the first suction side valve 22. It is difficult to remove completely before reaching the pulse tube or the cold storage tube. However, the valve unit 120l uses the four self seal joints of the first self seal joint 31, the second self seal joint 32, the third self seal joint 33, and the fourth self seal joint 35 to compress the compressor 10. In addition, the first regenerator tube 41 and the first pulse tube 42 of the expander 40 do not need to be heated to room temperature during the separation. Therefore, even during the cooling operation, the valve unit 120l is frequently separated from the compressor 10 and the expander 40, and maintenance is performed to remove the wear powder around the first discharge side valve 21 and the first suction side valve 22. There is an effect that the operation can be easily performed.

  Furthermore, in the pulse tube refrigerator 300l according to this modification, the first buffer 60 is housed in the valve unit 120 and has an integral structure, so that the expander 40 can be reduced in size and height. The installation area of the pulse tube refrigerator 300l can be reduced.

As described above, according to the pulse tube refrigerator 300l according to the present modification, it is possible to easily perform the maintenance work for removing the wear powder and to reduce the size of the pulse tube refrigerator.
(13th modification of 3rd Embodiment)
Next, with reference to FIG. 24, a pulse tube refrigerator according to a thirteenth modification of the third embodiment of the present invention will be described.

  FIG. 24 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the first modification of the third embodiment in that it does not include the first filter and the second filter.

  Referring to FIG. 24, unlike the first modification of the third embodiment, which includes the first filter and the second filter, the pulse tube refrigerator 300m according to the present modification includes a first filter and a second filter. 1 filter and 2nd filter are not included.

  As shown in FIG. 24, the configuration of the pulse tube refrigerator 300m according to this modification is the same as that of the first modification of the third embodiment except for the valve unit 120m.

  Unlike the first modification of the third embodiment, the valve unit 120m does not include the first filter and the second filter inside. Accordingly, each of the first discharge side valve 21 and the first suction side valve 22 and the second discharge side valve 21a and the second suction side valve 22a stored in the valve unit 120m has a third self-sealing joint. 33 and the fifth self-sealing joint 36 are detachably connected to the expander 40c.

  In the pulse tube refrigerator 300m according to this modification, as in the twelfth modification of the third embodiment, the valve unit 120m is frequently separated from the compressor 10 and the expander 40c, and the first discharge Maintenance work for removing the wear powder around the side valve 21, the first suction side valve 22, the second discharge side valve 21a, and the second suction side valve 22a can be easily performed.

  Furthermore, in the pulse tube refrigerator 300m according to this modification, the first buffer 60 is housed in the valve unit 120m so as to be integrated, so that the expander 40c can be reduced in size and height. The installation area of the pulse tube refrigerator 300m can be reduced.

As described above, according to the pulse tube refrigerator 300m according to the present modification, it is possible to easily perform the maintenance work for removing the abrasion powder and to reduce the size of the pulse tube refrigerator.
(14th modification of 3rd Embodiment)
Next, a pulse tube refrigerator according to a fourteenth modification of the third embodiment of the present invention will be described with reference to FIG.

  FIG. 25 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the second modification of the third embodiment in that it does not include the first filter and the second filter.

  Referring to FIG. 25, unlike the second modification of the third embodiment, which includes the first filter and the second filter, the pulse tube refrigerator 300n according to the present modification includes the first filter and the second filter. 1 filter and 2nd filter are not included.

  As shown in FIG. 25, the configuration of the pulse tube refrigerator 300n according to this modification is the same as that of the second modification of the third embodiment except for the valve unit 120n.

  Unlike the second modification of the third embodiment, the valve unit 120n does not include the first filter and the second filter inside. Accordingly, each of the first discharge side valve 21, the first suction side valve 22, the second discharge side valve 21a, and the second suction side valve 22a stored in the valve unit 120n has a third self-sealing joint. 33 and the fifth self-sealing joint 36, 36a, and is connected to the expander 40d in a separable manner.

  In the pulse tube refrigerator 300n according to the present modification, as in the twelfth modification of the third embodiment, the valve unit 120n is frequently separated from the compressor 10 and the expander 40d, and the first discharge Maintenance work for removing the wear powder around the side valve 21, the first suction side valve 22, the second discharge side valve 21a, and the second suction side valve 22a can be easily performed.

  Furthermore, in the pulse tube refrigerator 300n according to this modification, the first buffer 60 is housed in the valve unit 120n so as to be integrated, so that the expander 40d can be reduced in size and height. The installation area of the pulse tube refrigerator 300n can be reduced.

As described above, according to the pulse tube refrigerator 300n according to the present modification, it is possible to easily perform the maintenance work for removing the abrasion powder and to reduce the size of the pulse tube refrigerator.
(Fifteenth modification of the third embodiment)
Next, with reference to FIG. 26, a pulse tube refrigerator according to a fifteenth modification of the third embodiment of the present invention will be described.

  FIG. 26 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification is different from the pulse tube refrigerator according to the third modification of the third embodiment in that it does not include the first filter and the second filter.

  Referring to FIG. 26, the third modification of the third embodiment is different from including the first filter and the second filter, and the pulse tube refrigerator 300o according to this modification includes the first filter and the second filter. 1 filter and 2nd filter are not included.

  As shown in FIG. 26, the configuration of the pulse tube refrigerator 300o according to this modification is the same as that of the third modification of the third embodiment except for the valve unit 120o.

  Unlike the third modification of the third embodiment, the valve unit 120o does not include the first filter and the second filter inside. Accordingly, each of the first discharge side valve 21, the first suction side valve 22, the second discharge side valve 21a, and the second suction side valve 22a stored in the valve unit 120o has a third self-sealing joint. 33 and the fifth self-sealing joint 36 are detachably connected to the expander 40b.

  Also in the pulse tube refrigerator 300o according to the present modification, the valve unit 120o is frequently separated from the compressor 10 and the expander 40b as in the twelfth modification of the third embodiment, and the first discharge is performed. Maintenance work for removing the wear powder around the side valve 21, the first suction side valve 22, the second discharge side valve 21a, and the second suction side valve 22a can be easily performed.

  Furthermore, in the pulse tube refrigerator 300o according to this modification, the first buffer 60 is housed in the valve unit 120o so as to be integrated, so that the expander 40b can be reduced in size and height. The installation area of the pulse tube refrigerator 300o can be reduced.

As described above, according to the pulse tube refrigerator 300o according to this modification, it is possible to easily perform the maintenance work for removing the abrasion powder and to reduce the size of the pulse tube refrigerator.
(16th modification of 3rd Embodiment)
Next, a pulse tube refrigerator according to a sixteenth modification of the third embodiment of the present invention will be described with reference to FIG.

  FIG. 27 is a diagram schematically showing the configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification includes the pulse tube refrigerator according to the fourth modification of the third embodiment in that it does not include the first filter, the second filter, and the third filter. Is different.

  Referring to FIG. 27, the fourth modification of the third embodiment is different from the first modification, including the first filter, the second filter, and the third filter, and the pulse tube refrigeration according to the present modification. The machine 300p does not include the first filter, the second filter, and the third filter.

  As shown in FIG. 27, the configuration of the pulse tube refrigerator 300p according to this modification is the same as that of the fourth modification of the third embodiment except for the valve unit 120p.

  Unlike the fourth modification of the third embodiment, the valve unit 120p does not include the first filter, the second filter, and the third filter inside. Accordingly, the first discharge-side valve 21, the first suction-side valve 22, the second discharge-side valve 21a, the second suction-side valve 22a, the third discharge-side valve 21b, the second discharge-side valve 21b, which are stored in the valve unit 120p. Each of the three suction side valves 22b is detachably connected to the expander 40j via a third self-sealing joint 33, a fifth self-sealing joint 36, and a sixth self-sealing joint 37.

  Also in the pulse tube refrigerator 300p according to the present modification, the valve unit 120p is frequently separated from the compressor 10 and the expander 40j as in the twelfth modification of the third embodiment, and the first discharge Wear particles around the side valve 21, the first suction side valve 22, the second discharge side valve 21a, the second suction side valve 22a, the third discharge side valve 21b, and the third suction side valve 22b are removed. Maintenance work can be easily performed.

  Furthermore, in the pulse tube refrigerator 300p according to this modification, the first buffer 60 is housed in the valve unit 120p so as to be integrated, so that the expander 40j can be reduced in size and height. The installation area of the pulse tube refrigerator 300p can be reduced.

As described above, according to the pulse tube refrigerator 300p according to the present modification, it is possible to easily perform the maintenance work for removing the wear powder and to reduce the size of the pulse tube refrigerator.
(Seventeenth Modification of Third Embodiment)
Next, a pulse tube refrigerator according to a seventeenth modification of the third embodiment of the present invention will be described with reference to FIG.

  FIG. 28 is a diagram schematically showing a configuration of a pulse tube refrigerator according to this modification.

  The pulse tube refrigerator according to this modification includes the pulse tube refrigerator according to the fifth modification of the third embodiment in that it does not include the first filter, the second filter, and the third filter. Is different.

  Referring to FIG. 28, the fifth modification of the third embodiment is different from the first modification, including the first filter, the second filter, and the third filter, and the pulse tube refrigeration according to the present modification. The machine 300q does not include the first filter, the second filter, and the third filter.

  As shown in FIG. 28, the configuration of the pulse tube refrigerator 300q according to this modification is the same as that of the fifth modification of the third embodiment except for the valve unit 120q.

  Unlike the fifth modification of the third embodiment, the valve unit 120q does not include the first filter, the second filter, and the third filter inside. Accordingly, the first discharge-side valve 21, the first suction-side valve 22, the second discharge-side valve 21a, the second suction-side valve 22a, the third discharge-side valve 21b, the second discharge-side valve 21b, which are stored in the valve unit 120p. Each of the three suction side valves 22b is detachably connected to the expander 40k via a third self-sealing joint 33, a fifth self-sealing joint 36, and a sixth self-sealing joint 37.

  Also in the pulse tube refrigerator 300q according to this modification, as in the twelfth modification of the third embodiment, the valve unit 120q is frequently separated from the compressor 10 and the expander 40k, and the first discharge Wear particles around the side valve 21, the first suction side valve 22, the second discharge side valve 21a, the second suction side valve 22a, the third discharge side valve 21b, and the third suction side valve 22b are removed. Maintenance work can be easily performed.

  Furthermore, in the pulse tube refrigerator 300q according to this modification, the first buffer 60 is housed in the valve unit 120q and integrated, so that the expander 40k can be reduced in size and height. The installation area of the pulse tube refrigerator 300q can be reduced.

  As described above, according to the pulse tube refrigerator 300q according to the present modification, it is possible to easily perform the maintenance work for removing the abrasion powder and to reduce the size of the pulse tube refrigerator.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be modified or changed.

DESCRIPTION OF SYMBOLS 10 Compressor 11 High pressure piping 12 Low pressure piping 20, 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h Valve unit 21 1st discharge side valve 21a 2nd discharge side valve 21b 3rd discharge side valve 22 First suction valve 22a Second suction valve 22b Third suction valve 23 First filter 23a Second filter 23b Third filter 31 First self-seal joint 32 Second self-seal joint 33 Third self-seal joint 34 Self-seal joint 35 Fourth self-seal joint 36, 36a Fifth self-seal joint 37 Sixth self-seal joint 38 Eighth self-seal joint 39 Ninth self-seal joint 40, 40a 40b, 40c, 40d, 40e, 40f, 40g, 40h, 40j, 40k expander 41 first Cold tube 42 First pulse tube 41a Second regenerative tube 42a Second pulse tube 43, 43e Cold vessel 44, 44a, 44b, 44c, 44d, 44e, 44f, 44g, 44h, 44j, 44k Flange / Piping unit 51, 51a, 51b, 51c, 51d, 51e First orifice 52, 52b Second orifice 60 First buffer 60b Second buffer 70 Expander 71 Cold storage tube 72 Cylinder 73 Cold vessel 74 Flange / Power chamber unit 75 Connecting member 76 Motor 77 First expansion space 78 Second expansion space 100, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h Pulse tube refrigerator 110 Regenerative refrigerator 120, 120a to 120q Valve unit 300 300a ~ 300q Pulse tube refrigerator P1, P2 P3, P4, P5, P6, P7, P8, P9, P10 the point of attachment

Claims (5)

A first pulse tube for adiabatic expansion of the refrigerant gas;
A first regenerative tube that is connected to the first pulse tube and stores cold heat generated in the first pulse tube with adiabatic expansion of the refrigerant gas;
A compressor for compressing the refrigerant gas;
A first discharge side valve for communicating or blocking the discharge side of the compressor and the high temperature end side of the first regenerative tube;
It couple | bonds with the said high temperature end side of the said 1st cool storage pipe via the 1st coupling point which is an intermediate point of the discharge side of the said 1st discharge side valve | bulb, and the said high temperature end side of the said 1st cool storage pipe. A first suction side valve for communicating or blocking the high temperature end side of the first regenerator tube and the suction side of the compressor;
A first self-sealing joint provided between the discharge side of the compressor and the suction side of the first discharge side valve;
A second self-sealing joint provided between a discharge side of the first suction side valve and the suction side of the compressor;
By separating the first coupling point and the high temperature end side of the first regenerative tube without increasing the temperature of the first pulse tube and the first regenerative tube to room temperature, In order to remove the wear powder around the first discharge side valve and the first suction side valve, the first coupling point and the high temperature end side of the first regenerator tube are separably connected. A third self-sealing joint provided to
A first buffer provided so as to be connected to a high temperature end side of the first pulse tube;
A fourth self-sealing joint provided between the high temperature end side of the first pulse tube and the first buffer;
A valve unit for storing the first discharge side valve and the first suction side valve;
The pulse tube refrigerator, wherein the first buffer is stored in the valve unit. The discharge side of the compressor is coupled to the discharge side of the compressor via a second coupling point that is an intermediate point between the suction side of the first discharge side valve and the first self-sealing joint. A second discharge side valve for communicating or blocking a side and the high temperature end side of the first pulse tube;
The first pulse tube is coupled to the suction side of the compressor via a third coupling point that is an intermediate point between the discharge side of the first suction side valve and the second self-sealing joint. A second suction side valve for communicating or blocking between the high temperature end side of the compressor and the suction side of the compressor;
A fifth self-sealing joint provided between the discharge side of the second discharge side valve and the high temperature end side of the first pulse tube;
The pulse tube refrigerator according to claim 1, wherein the second discharge side valve and the second suction side valve are stored in the valve unit. The first buffer includes the high-temperature end of the first pulse tube via a fourth coupling point that is an intermediate point between the discharge side of the second discharge-side valve and the fifth self-seal joint. Provided to connect with the side,
The pulse tube refrigerator according to claim 2, further comprising an orifice provided between the fourth coupling point and the first buffer and housed in the valve unit. A second pulse tube for adiabatic expansion of the refrigerant gas;
A second regenerative tube provided between a low temperature end side of the second pulse tube and a low temperature end side of the first regenerative tube;
The discharge side of the compressor is coupled to the discharge side of the compressor via a fifth coupling point that is an intermediate point between the suction side of the first discharge side valve and the first self-sealing joint. A third discharge side valve for communicating or blocking the side and the high temperature end side of the second pulse tube;
The second pulse tube is coupled to the suction side of the compressor via a sixth coupling point that is an intermediate point between the discharge side of the first suction side valve and the second self-sealing joint. A third suction side valve for communicating or blocking the high temperature end side of the compressor and the suction side of the compressor;
A sixth self-sealing joint provided between a discharge side of the third discharge side valve and the high temperature end side of the second pulse tube;
The pulse tube refrigerator according to claim 3, wherein the third discharge side valve and the third suction side valve are stored in the valve unit. Provided to be coupled to the high temperature end side of the second pulse tube via a seventh coupling point that is an intermediate point between the discharge side of the third discharge side valve and the sixth self-sealing joint. A second buffer to be provided,
The pulse tube refrigerator according to claim 4, wherein the second buffer is stored in the valve unit.

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