JP3333776B2 - Pulsating tube refrigerator cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulsating tube refrigerator, and more particularly, to a refrigerant compression refrigeration cycle having a precooler for pre-cooling a high-temperature and high-pressure working gas as an evaporator. The present invention also relates to a cooling device for a pulsating tube refrigerator that can smoothly release heat generated by a drive unit and improve the overall performance of the refrigerator.

[0002]

2. Description of the Related Art Generally, cryogenic refrigerators are low-vibration and high-reliability refrigerators used for cooling with small electronic components or superconductors. GM refrigerators and Joule Thomson refrigerators are widely used.

In a conventional pulsating tube refrigerator, as shown in FIG. 4, a driving unit 100 performs a reciprocating motion for pumping a working gas, and after being pumped by the driving unit 100, reciprocating motion in a pulsating tube. Part 200 forming a cryogenic part by the thermodynamic cycle of the working gas to be heated, and a pre-cooler 300 engaged between the driving part 100 and the freezing part 200 to pre-cool the pumped high-temperature and high-pressure working gas. And is provided.

In the drive unit 100, a sealed case 110, an upper frame 111 connected to an upper part of the sealed case 110, and a fastening housing accommodated in the sealed case 110 below the upper frame 111. An intermediate frame 112, a drive motor 120 mounted on the intermediate frame 112 inside the sealed case 110 via a drive shaft 130, a cylinder portion 110a cut and formed at the center of the upper frame 111, And a lower frame 113 coupled below the lower end 112 of the drive shaft 130 and connected to the front end of the drive shaft 130.
0a, and a piston 140 for pumping the working gas by reciprocating motion, the intermediate frame 112 and the lower frame 113 on both upper and lower sides of the drive shaft 130.
And a guide support member 151 and an elastic support member 152 that induce the resonance motion of the drive motor 120 and guide the straightness of the piston 140.

In the refrigeration section 200, the internal working gas is compressed and expanded at both ends by the pumped working gas, and the heat is released from the warm side heat exchanger 211 in the compression section, and the cold side heat exchanger in the expansion section is released. At 212, a phase difference is generated between the pulsating tube 210 that absorbs external heat, the mass flow of the working gas that is connected to the warm-side heat exchanger 211 of the compression section of the pulsating tube 210, and the pressure pulsation, and A phase controller 220 for maintaining the balance, a storage container 230 connected to the phase controller 220, and a cold-side heat exchanger 212 at the expansion part of the pulsating tube 210 are pumped to the pulsating tube 210. After storing the sensible heat of the working gas, the regenerator 240 for compensating the temperature of the returning working gas, and shielding the pulsating tube 210, the phase controller 220, the storage container 230 and the regenerator 240 from the outside. Second sealing shell 25 to to closed
0.

The precooler 300 is roughly classified into an air-cooled type and a water-cooled type. In the air-cooled type, heat transmitted to the wall surface of the precooler 300 is brought into contact with the outer wall of the precooler 300. The water-cooled type is a system in which heat is exchanged with the outside by using the pump and a separate heat exchanger that dissipates heat.

Hereinafter, the structure of the precooler 300 will be described in more detail. First, as shown in FIG. 5, the air-cooling type pre-cooler 300 is formed in a hollow cylindrical shape using a material having a high thermal conductivity such as copper, and an upper end surface thereof is formed in the second sealing shell 250 ( 4), and is fixed to the base plate P on the lower side of the upper frame 11.
1, a pre-cooler body 310 fastened to the upper surface of the pre-cooler body 310, and a heat exchange area between the pre-cooler body 310 and the gas when the generated heat of the working gas to be pumped is absorbed. As such, the internal heat exchanger 320 formed in a mesh shape is engaged with the outer peripheral surface of the precooler main body 310,
A hollow cylindrical external heat exchanger 330 having a plurality of cooling pins for dissipating heat transmitted from the internal heat exchanger 320 to the precooler main body 310 to the outside.

On the other hand, the water-cooled type precooler 300a is shown in FIG.
As shown in FIG. 2, the air conditioner includes a precooler body 310 similar to the air-cooled precooler, an internal heat exchanger 320 similar to the air-cooled type mounted inside the precooler body 310, and a plurality of cooling pins. A hollow cylindrical external heat exchanger 330a engaged with the outer peripheral surface of the precooler main body 310; a heat insulating member 340 covered with a closed space S on the outer peripheral surface of the external heat exchanger 330a; It comprises a pump 350 and a heat exchanger 360 for supplying and circulating cooling water to the closed space S so as to form a closed cycle via the member 340. In the figure, reference numerals 341 and 342 denote a lid formed with a plurality of holes so that gas can flow in / out, 370 denotes a bubble discharge pipe, and F denotes a blower pipe.

Hereinafter, the operation process of the conventional pulsating tube refrigerator configured as described above will be described with reference to FIG. Drive motor 1
When power is applied to the drive motor 20 and a mover (not shown) of the drive motor 120 performs a linear reciprocating motion, the drive shaft 130 coupled to the mover performs a linear reciprocal motion, and the drive shaft 130 The piston 140, which is integrally engaged with the pump, pumps the working gas of the refrigeration unit 200 while performing a linear reciprocating motion inside the cylinder unit 110a.

The working gas pumped in this way is:
The heat of the cold-side heat exchanger 212 is moved to the warm-side heat exchanger 211 while reciprocating between the cold-side heat exchanger 212 side and the warm-side heat exchanger 211 side of the pulsation tube 210, and the cold-side heat exchanger 212 side is moved. To form a cryogenic part. At this time, during the compression stroke of the piston 140, the compressed working gas moved from the cylinder 110a to the refrigerating unit 200 is cooled to a predetermined temperature through the precooler 300,
The heat flows into the regenerator 240, passes through the regenerator 240, is heat-exchanged, and flows into the cold-side heat exchanger 212 of the pulsating tube 210 in a state where sensible heat is hidden.

Therefore, by the flowing working gas,
The working gas filled in the pulsation tube 210 is moved to the warm side heat exchanger 211 and the phase controller 220 side and compressed, and then, during the suction stroke of the piston 140, the cold side heat exchanger of the pulsation tube 210 It moves to the 212 side and is rapidly adiabatically expanded to form a cryogenic portion. As described above, the working gas released from the pulsating tube 210 is again supplied to the regenerator 240
Through the pre-cooler 300 and then into the cylinder 110a.

At this time, when the precooler is an air-cooled type, the external heat exchanger 330 to which the heat of the working gas is transmitted.
Each cooling pin comes into contact with air blown from a separate fan F shown in FIG. 5 and dissipates heat. When the precooler is a water-cooled type, it is pumped by a pump as shown in FIG. After the cooling water is cooled via the external heat exchanger 360, the internal heat of the precooler main body 310 is radiated while being circulated / supplied to the closed space S.

[0013]

However, in such a conventional precooler of a pulsating tube refrigerator, a mesh-shaped internal heat exchanger is installed inside, and an air-cooled or water-cooled external heat exchanger is installed outside. In order to dissipate the working gas and the heat generated by the drive unit, the air-cooled external heat exchanger and the water-cooled external heat exchanger, when the actual outside air temperature is high, have a reduced heat radiation effect and flow into the refrigerating unit. However, if the temperature of the working gas rises, the refrigeration effect decreases, and if this is attempted to be compensated, the required power of the drive unit is increased, and the overall performance of the refrigerator is increased. There was an inconvenience of lowering.

In particular, in the water-cooled external heat exchanger, it is difficult to completely fill the water-cooling cycle with cooling water, it is difficult to form a closed cycle, and a separate bubble discharge pipe for discharging generated bubbles is provided. Since the cooling water circulating in the cycle needs to be discharged through the bubble discharge pipe, the cooling water must be resupplied at any time. There is an inconvenience that substances are generated and a separate filter or a rust preventive agent is required, which complicates the operation.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a refrigerant compression refrigeration cycle having a precooler as an evaporator, and working gas and drive gas. An object of the present invention is to provide a cooling device for a pulsating tube refrigerator, which can smoothly radiate heat generated in a portion and further improve the overall performance of the refrigerator.

[0016]

[SUMMARY OF] To achieve the above object, in the cooling apparatus of the pulse tube refrigerator according to the present invention, the drive unit and the drive unit you pumping a working gas
Frozen section that form a cryogenic portion of the working gas to be pumped
A precooler body engaged between, inside the precooler body
The attached internal heat exchanger and the outer peripheral surface of the precooler body
External heat exchanger having a plurality of cooling fins
A sealed space having a predetermined width is provided on the outer peripheral surface of the external heat exchanger.
Penetrates both sides of the insulation member covered with
And a refrigerant pipe communicated with both sides of the closed space,
Compressor installed at the outlet side of refrigerant pipe to compress refrigerant gas
And installed in the rear refrigerant pipe of the compressor,
A condensing heat exchanger for performing a heat exchange action;
Installed in the refrigerant pipe between the exchange and the inlet side of the enclosed space.
And an expansion valve .

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment of the pulsating tube refrigerator according to the present invention, as shown in FIG. 1, a driving unit 100 that performs a reciprocating motion to pump a working gas, and pumping is performed by the driving unit 100. A refrigeration unit 200 having a pulsating tube in which a cryogenic portion is formed by operation of a working gas;
0a and a refrigerant compression type cooling means which is engaged between the regenerator 240 of the refrigeration unit 200 and cools the pumped high-temperature and high-pressure working gas.

The driving unit 100 and the freezing unit 20
The structure of No. 0 is the same as that of the related art, so that the detailed description is omitted, and the structure of the refrigerant compression type cooling means is as follows. That is, in the refrigerant compression type cooling means, the upper end is engaged with the base plate P at the lower end of the sealing shell 250, and the lower end surface is connected to the cylinder 11 of the drive unit 100.
A hollow cylindrical precooler body 410 engaged with the upper surface of the upper frame 111 provided with
0, a hollow cylindrical external heat exchanger 430 having a plurality of cooling pins and engaged with the outer peripheral surface of the precooler main body 410; A pre-cooler 400 having a heat insulating member 440 spaced apart from the heat exchanger 430 with a predetermined width of a closed space S provided therebetween, and communicating with both sides of the closed space S via the heat insulating member 440. A refrigerant pipe 450 and a compressor 460 connected to an outlet side of the refrigerant pipe 450 for compressing refrigerant gas;
And a condenser 470 connected to the compressor 460 by the refrigerant pipe 450 and serving as a heat exchanger for condensation. A refrigerant pipe 450 is provided between the condenser 470 and the inlet side of the closed space S.
And an expansion valve 480 connected by the

The refrigerant pipe 450 is connected to the compressor 4
60, the condenser 470 and the expansion valve 4
One end is communicated with the outlet side of the expansion valve 480 through the heat insulating member 440 so that the refrigerant sequentially passing through 80 flows into the closed space S, and the other end is connected to the external heat exchanger 430. The heat insulating member 4 is provided so that the heat-exchanged refrigerant flows out of the closed space S to the compressor 460.
It is in communication with the compressor 460 via 40. Therefore, in the present invention, in the structure of the conventional water-cooled precooler, a refrigerant compression refrigeration cycle that uses the precooler as an evaporator is configured to radiate the working gas and the heat generated by the drive unit. I have.

The operation of the refrigeration system for a pulsating tube refrigerator according to the first embodiment of the present invention will now be described. That is, when power is applied to the drive motor 120 and a mover (not shown) reciprocates linearly, the drive shaft 130 supported by the mover also linearly reciprocates, and The piston 140 integrally engaged performs a linear reciprocating motion inside the cylinder part 110a to pump the working gas of the refrigeration part 200. The working gas thus pumped moves the heat of the cold-side heat exchanger 212 side to the warm-side heat exchanger 211 side while reciprocating between the cold-side heat exchanger 212 side and the warm-side heat exchanger 211 side of the pulsating tube 210. Thus, a cryogenic portion is formed on the cold side heat exchanger 212 side.

At this time, during the compression stroke of the piston 140, the working gas which has been moved from the cylinder portion 110a to the refrigerating portion 200 and compressed is cooled to a predetermined temperature via the refrigerant compression type cooling means. After flowing into the regenerator 240 and undergoing heat exchange through the regenerator 240, the heat flows into the pulsating tube 210 on the side of the cold-side heat exchanger 212 while containing sensible heat.

Thereafter, the working gas that has been filled in the pulsating tube 210 by the working gas thus introduced is moved to the warm side heat exchanger 211 and the phase controller 220 side and compressed. During the suction stroke of the piston 140, the pulsation tube 210 is moved to the cold side heat exchanger 212 side,
It is rapidly adiabatically expanded to form a cryogenic part. The working gas discharged from the pulsating tube 210 is again heated to a predetermined temperature through the regenerator 240, radiated through the refrigerant compression cooling means, and then flows into the cylinder 110a.

As described above, in the first embodiment according to the present invention, the heat of the working gas is supplied to the internal heat exchanger
The heat transferred to the pre-cooler main body 410 is transferred to the external heat exchanger 430, and the heat transferred to the external heat exchanger 430 is transferred to the compressor 460. The low temperature and low pressure liquid refrigerant flowing into the closed space S through the condenser 470 and the expansion valve 480 comes into surface contact with the liquid refrigerant, and is cooled while evaporating the refrigerant liquid.

That is, an external heat exchanger 430 is formed on the outer peripheral surface of the precooler main body 410, a predetermined closed space S is formed outside the external heat exchanger 430, and a refrigerant compression refrigeration cycle is formed in the closed space S. Because the refrigerant pipe 450 of the
The refrigerant is brought into contact with the external heat exchanger 430 and the pre-cooler body 41
Allow 0 to cool.

Hereinafter, a second embodiment of the refrigerating apparatus for a pulsating tube refrigerator according to the present invention may be configured as follows. In the second embodiment of the refrigerating device of the pulsating tube refrigerator according to the present invention, as shown in FIG.
0 is formed by winding a refrigerant pipe 550 around the outer peripheral surface. That is, the refrigerant pipe 550 is wound around the outer peripheral surface of the precooler body 410 a plurality of times, and then the expansion valve 4
80 and the compressor 460, and the refrigerant pipe 550
Is covered with a heat insulating member 540. At this time, silver plating is applied to the precooler body 410 and the refrigerant pipe 550 in order to smoothly transfer heat.

Hereinafter, a refrigeration system for a pulsating tube refrigerator according to a third embodiment of the present invention may be configured as follows. In the third embodiment of the pulsating tube refrigerator according to the present invention, as shown in FIG. 3, the refrigerator is formed in a hollow cylindrical shape, and an upper end thereof is connected to a base plate P at a lower end of the sealing shell 250. The lower end face is engaged with the drive unit 1.
Upper frame 1 provided with a 00 cylinder portion 110a
11, a pre-cooler main body 610 engaged with the upper surface of the pre-cooler main body 610, and a net-like internal heat exchanger 62 mounted inside the pre-cooler main body 610.
0, and a heat insulating member 640 covered by the outer peripheral surface of the precooler main body 610.

The operation of the refrigeration system for a pulsating tube refrigerator according to the third embodiment of the present invention will now be described.
A refrigerant pipe 650 is formed so that the working gas discharged from the compressor 460 is changed into a low-temperature and low-pressure refrigerant liquid through the condenser 470 and the expansion valve 480 and flows into the precooler main body 610. The working gas inside the precooler main body 610 is in direct contact with the refrigerant pipe 650 because the working gas is penetrated into the precooler main body 610 through the heat insulating member 640 and is extended to the inside of the internal heat exchanger 620. .

As described above, in each embodiment of the cooling device for the pulsating tube refrigerator according to the present invention, a refrigerant compression refrigeration cycle is provided which includes a separate bubble discharge pipe and uses a precooling means as an evaporator. However, it is not necessary to re-supply the cooling water at any time, and even when the actual outside air temperature of the refrigerator is high, the working gas and the heat of the drive unit are smoothly radiated, and the overall performance of the refrigerator is improved. Can be improved. Further, the present invention is not limited to such an embodiment, and can be used in various forms within the scope of the claims.

[0029]

As described above, in the refrigerating apparatus of the pulsating tube refrigerator according to the present invention, the working gas to be compressed and the heat generated from the driving section, which are connected between the driving section and the refrigerating section, are cooled. The pre-cooler to be used is an evaporator, and a compressor-compression-type cooling cycle comprising a compressor, a condenser, and an expansion valve simplifies the overall structure, so that even when the actual outside air temperature is high, it is smooth. There is an effect that the heat is dissipated, the temperature of the working gas is prevented from rising, and the overall performance of the refrigerator can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a refrigerating device of a pulsating tube refrigerator according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the refrigerating device of the pulsating tube refrigerator according to the present invention.

FIG. 3 is a longitudinal sectional view showing a refrigeration apparatus for a pulsating tube refrigerator according to a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing an example of a conventional pulsating tube refrigerator.

FIG. 5 is a longitudinal sectional view showing an example of an air-cooled precooler of a conventional pulsating tube refrigerator.

FIG. 6 is a longitudinal sectional view showing an example of a conventional water-cooled precooler of a pulsating tube refrigerator.

[Explanation of symbols]

 400: Precooler 410, 610: Precooler body 420, 620: Internal heat exchanger 430: External heat exchanger 440, 540, 640: Heat insulating member 450, 550, 650: Refrigerant tube 460: Compressor 470: Condenser 480: Expansion valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 9/00 311 F25B 25/00

Claims (3)

(57) [Claims] 1. A form a very low temperature portion of the working gas which is pumped by the drive unit and the drive unit you pumping a working gas
A precooler body engaged between the refrigeration unit you, and an internal heat exchanger mounted inside the precooler body, the outer peripheral surface of the precooler body, a plurality of cooling fins
With the external heat exchanger engaged, a sealed space with a predetermined width is placed on the outer peripheral surface of the external heat exchanger.
A covered heat insulating member, and both sides of the closed space penetrating both sides of the heat insulating member
And a pressure that is provided at an outlet side of the refrigerant pipe and compresses refrigerant gas.
A compressor, and a heat exchanger for cooling the refrigerant, which is provided in a refrigerant pipe on the rear side of the compressor.
A condensing heat exchanger for performing a heat exchange operation, and the cooling between the condensing heat exchanger and an inlet side of the closed space.
A cooling device for a pulsating tube refrigerator , comprising: an expansion valve installed in a medium pipe . 2. A drive unit for pumping a working gas and the drive unit.
Cryogenic part of working gas pumped by moving part
A precooler body engaged between the refrigeration unit to the an internal heat exchanger mounted inside the precooler body, a heat insulating member is covered at the enclosed space of a predetermined width on the outer peripheral surface of the external heat exchanger And penetrating both sides of the heat insulating member and inside the closed space
Positioned and wound multiple times around the outer peripheral surface of the precooler body
A refrigerant pipe, and a pressure installed at an outlet side of the refrigerant pipe for compressing the refrigerant gas.
A compressor, and a heat exchanger for cooling the refrigerant, which is provided in a refrigerant pipe on the rear side of the compressor.
A condensing heat exchanger for performing a heat exchange operation, and the cooling between the condensing heat exchanger and an inlet side of the closed space.
Cooling system pulse tube refrigerator of the expansion valve installed in the medium tube, characterized in Rukoto is configured with a. 3. A drive unit for pumping a working gas and the drive unit.
Cryogenic part of working gas pumped by moving part
A precooler body engaged between the refrigeration unit to the internal heat exchanger mounted inside the precooler body, the outer peripheral surface of the precooler body, a plurality of cooling fins
Engaged with an external heat exchanger, and the heat insulating member wound around the outer peripheral surface of the external heat exchanger, the working gas through the both side of the heat insulating member to pass
The working gas is installed inside the precooler main body.
A refrigerant pipe that is in direct contact with the refrigerant pipe and a pressure that is provided at an outlet side of the refrigerant pipe and compresses a refrigerant gas;
A compressor, and a heat exchanger for cooling the refrigerant, which is provided in a refrigerant pipe on the rear side of the compressor.
A condensing heat exchanger for performing a heat exchange operation, and the cooling between the condensing heat exchanger and an inlet side of the closed space.
A cooling device for a pulsating tube refrigerator , comprising: an expansion valve installed in a medium pipe .