JP3395489B2 - Thermal expansion valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a refrigeration cycle,
The present invention relates to a temperature type expansion valve that decompresses and expands the refrigerant flowing from the high pressure side liquid refrigerant circuit in response to the degree of superheat of the refrigerant at the evaporator outlet, and is suitable for use in, for example, an automobile air conditioner.

[0002]

2. Description of the Related Art Conventionally, as a thermal expansion valve of this type,
As described in JP-A-6-26741,
It is known that a temperature-sensing mechanism that senses the temperature of the refrigerant at the outlet of the evaporator is also housed in a housing that houses the expansion mechanism. The diaphragm case of the temperature sensing mechanism is fixed to the housing, and the valve element of the expansion mechanism is actuated in response to the displacement of the diaphragm provided in the diaphragm case of the temperature sensing mechanism.

[0003]

By the way, experiments and studies by the present inventors have revealed that the operation of the expansion valve causes noise due to the following causes. That is,
Since the valve body of the expansion mechanism is for adjusting the opening degree of the throttle passage for rapidly depressurizing and expanding the high-pressure liquid refrigerant flowing from the high-pressure side liquid refrigerant circuit, the rapid depressurization and expansion of the refrigerant in the throttle passage. Under the influence of the action, the valve body repeats minute vibrations.

The vibration of the valve disc is caused by a valve rod connected to the valve disc, a metal contact member in contact with the valve rod, a metal diaphragm in contact with the contact member, and the diaphragm. It is transmitted to the housing through the diaphragm case of the temperature-sensitive mechanism that holds and fixes the outer peripheral part of the. Therefore, there arises a problem that noise due to the vibration of the valve body is emitted to the outside from the housing and the refrigerant pipe connected to the housing.

The present invention has been made in view of the above points,
The purpose is to reduce noise due to vibration of the thermal expansion valve.

[0006]

In order to achieve the above object, the present invention employs the following technical means. That is, the invention according to claim 1 includes the throttle passage (39) for decompressing and expanding the refrigerant flowing from the high pressure side refrigerant circuit, and the valve body (49) for adjusting the opening degree of the throttle passage (39). An expansion mechanism (47) and a temperature sensing mechanism (35) having a pressure responsive member (38) that is displaced according to the refrigerant temperature at the outlet of the evaporator (21) and the refrigerant pressure at the outlet of the evaporator (21). In the temperature type expansion valve that displaces the valve element (49) according to the displacement of the pressure responsive member (38), the expansion mechanism (47) and the temperature sensing mechanism (35) are provided with a rubber support member (54). ), The housing member (31,
32) is elastically supported.

Therefore, according to the first aspect of the invention, even if the valve body (49) of the expansion mechanism (47) vibrates due to the rapid pressure reduction and expansion of the refrigerant in the throttle passage (39),
This vibration can be absorbed by the rubber support member (54),
Therefore, the vibration of the valve body (49) or the like may cause the vibration of the housing member (3
It is possible to significantly reduce the generation of noise by propagating to the (1, 32) side.

According to the second aspect of the invention, the throttle passage (39) for depressurizing and expanding the refrigerant flowing from the high pressure side refrigerant circuit into the housing member (31, 32), and the throttle passage (39). A valve body (49) for adjusting the opening is provided, and the temperature sensing mechanism (35) is movably accommodated in the housing member (31, 32) separately from the housing member (31, 32). Case (3) of temperature mechanism (35)
6, 37) has a built-in pressure responsive member (38) that is displaced according to the refrigerant temperature at the outlet of the evaporator (21) and the refrigerant pressure at the outlet of the evaporator (21), and the case of the temperature sensing mechanism (35) ( 36, 37), the valve body (49) is integrally connected to the temperature sensing mechanism (3) according to the displacement of the pressure responsive member (38).
5) and the valve body (49) are configured to move integrally, and further, an expansion mechanism (47) including the throttle passage (39) and the valve body (49) is provided with a rubber support member (54). It is characterized in that it is elastically supported by the housing member (31, 32) with the interposition of.

Therefore, according to the second aspect of the invention, the opening degree of the throttle passage (39) can be adjusted by moving the temperature sensing mechanism (35) and the valve body (49) integrally. it can. Moreover, even if the valve body (49) or the like of the expansion mechanism (47) vibrates, this vibration can be absorbed by the rubber support member (54). It is possible to significantly reduce the generation of noise by the vibration propagating to the housing member (31, 32) side.

The invention according to claim 3 is characterized in that a portion supporting the expansion mechanism (47) and a portion supporting the temperature sensing mechanism (35) are integrally formed on the rubber supporting member (54). . In the invention according to claim 4, the high-pressure side refrigerant passage (54a) into which the refrigerant from the high-pressure side refrigerant circuit flows into the throttle passage (39), and the low-pressure side into which the low-pressure side refrigerant passing through the throttle passage (39) flows. It is characterized in that the refrigerant passage (54b) is formed in a rubber support member (54).

As described above, in the third and fourth aspects of the invention, since the rubber supporting member (54) is formed as an integrally molded product, the structure of the expansion valve can be simplified. Further, the invention according to claim 5 is characterized in that the rubber hardness of the rubber support member (54) is in the range of Hs 50 to 70. Thus, by setting the rubber hardness to Hs 70 or less, noise can be reduced particularly effectively, as shown in experimental data described later. Further, by setting the rubber hardness to Hs50 or more, it is possible to realize stable support of both mechanisms (35, 47) and secure the sealing property of the passage connecting portion.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 4 show the first embodiment, and FIG. 4 is a diagram showing an outline of the overall configuration of an air conditioner for an automobile. , Roughly, a condensing device group 1 installed in the engine room E of the automobile, a cooling unit 2 installed in the vehicle interior R of the automobile, and a dashboard D separating the engine room E and the vehicle interior R from each other. The thermal expansion valve 3 is arranged and also serves as a connecting member for the refrigerant pipes on the engine room E side and the vehicle room R side.

The condensing device group 1 is, as is well known, a compressor 10 driven by an automobile engine, and the compressor 1
It comprises a condenser 11 that cools and condenses the discharged refrigerant gas of 0, a receiver 12 that stores the condensed refrigerant from the condenser 11 and draws only the liquid refrigerant to the downstream side. The operation of the compressor 10 can be interrupted by the electromagnetic clutch 10a.

The cooling unit 2 has a resin cooling unit case 20, and an evaporator 21 is built in the case 20. The cooling unit 2 is sucked from an inside / outside air switching box 22 of an air conditioner for an automobile and is of a centrifugal type. The air blown by the multiblade blower 23 is cooled and dehumidified. A heater unit 2 is provided on the air downstream side of the cooling unit 2.
8 are provided. In this heater unit 28,
As is well known, a warm water type heater core 24, a temperature control air mix damper 25, three blower outlet switching dampers 26,
Various air outlets 27 and the like are provided.

FIG. 3 is a diagram showing an outline of a pipe connection configuration between the evaporator 21 and the expansion valve 3, wherein 70 to 73 are pipes and 63 is a pipe joint member. The suction side refrigerant pipe 71 and the discharge side refrigerant pipe 72 of the compressor 10 are connected to the pipe joint member 6
2 and the second housing 3 of the expansion valve 3
It is screwed and fixed to 2. The low-pressure refrigerant pipes 70 and 73 exiting from the evaporator 21 are connected to the first housing 31 of the expansion valve 3 by brazing or the like.

The essential part of the present invention is the thermal expansion valve 3 described above, and its specific structure will be described in detail below with reference to FIGS. The first and second housings 31 and 32 are made of a metal such as aluminum which is lightweight and has excellent corrosion resistance. As shown in FIG. 1, the first housing 31 has a cylindrical shape and has a bottom portion. At the bottom, the low-pressure pipe 7
A first coolant outflow hole 311 and a first coolant inflow hole 312, which are connected to 0 and 73, are formed.

On the other hand, as shown in FIG. 1, the second housing 32 has a cylindrical shape and can be inserted into the first housing 31, and is connected to the suction and discharge refrigerant pipes 71 and 72. Two refrigerant inflow holes 321 and a second refrigerant outflow hole 322 are formed. Then, the first and second
The housings 31 and 32 of 1 are screwed by a lid 33 so as not to come off.

On the other hand, in the first housing 31,
A low-pressure side refrigerant passage 34 is formed at a portion between the first refrigerant inflow hole 312 and the second refrigerant outflow hole 322.
A temperature-sensing mechanism 35 is provided in the inside of the unit 4. The temperature-sensing mechanism 35 includes an upper metal diaphragm case 36, a lower metal diaphragm case 37, and both cases 3
It has a metal diaphragm 38 which is sandwiched and fixed between 6 and 37.

The lower diaphragm case 37 has a cup-shaped portion 37a that hangs downward in FIG. 1, and a throttle passage 39 for the refrigerant is formed at the bottom of the cup-shaped portion 37a. In addition, the side surface (circumferential surface) of the cup-shaped portion 37a
A coolant outflow hole 40 is formed in the. Further, in the lower diaphragm case 37, the refrigerant pressure (low pressure) in the low pressure side refrigerant passage 34 is introduced into a pressure chamber 43a between the diaphragm case 37 and the diaphragm 38 at a portion located below the diaphragm 38. Low pressure introduction hole 41
Are formed.

On the other hand, an activated carbon 42 is enclosed in a greenhouse 43 formed between the upper diaphragm case 36 and the diaphragm 38, and the same greenhouse gas as the refrigerant in the refrigeration cycle is enclosed in the greenhouse 43. After that, the opening of the upper diaphragm case 36 is sealed by brazing the lid 44 or the like. Further, in the pressure chamber 43a in the lower diaphragm case 37, a metal contact member 45 that is displaced according to the displacement of the diaphragm 38 is disposed, and the contact member 45 has a shaft portion 45a, The shaft portion 45a is held so as to slide along a resin guide 46 press-fitted and fixed to the inner wall surface of the cup-shaped portion 37a of the lower diaphragm case 37.

The shaft portion 45a of the contact member 45 and the cup-shaped portion 3
An air-tightness is maintained between O and 7a by an O-ring (elastic sealing material) 45b. Then, the contact member 45
One end of a valve rod 48 of the expansion mechanism 47 is in contact with the.
The valve rod 48 has a through hole 46 a formed in the guide 46.
It is slidably fitted to. A spherical valve body 49 is in contact with the other end of the valve rod 48, and the opening degree of the throttle passage 39 is adjusted by the valve body 49. Disc 4
9 is joined to the spring seat plate 50.
The spring force of the coil spring 51 acts on the valve element 49 via 0. The coil spring 51 is
One end thereof is held by the seat plate 50, and the other end is held by the spring holding cylinder 52.

A passage cylinder 53 is integrally joined to the bottom outer wall surface of the cup-shaped portion 37a of the lower diaphragm case 37, and the spring holding cylinder 52 is fixed to the passage cylinder 53 with a screw. Then, by adjusting the mounting position of the spring holding cylinder 52 with this screw, the spring force acting on the valve element 49 is adjusted and the valve opening characteristic of the valve element 49 is adjusted. As a result, the degree of superheat of the outlet refrigerant of the evaporator 21 can be adjusted.

On the side surface (circumferential surface) of the passage tube 53,
A passage hole 53a is formed, and this passage hole 53a is
The high pressure space 55 formed in the spring holding cylinder 52 is communicated with the passage cylinder 53. The temperature sensing mechanism 35 and the entire expansion mechanism 47 are integrally joined to the rubber body (support member) 54 by press fitting or baking. More specifically, among the temperature sensing mechanism 35 and the expansion mechanism 47, the cup-shaped portion 37a of the lower diaphragm case 37, the passage cylinder 53, and the spring holding cylinder 52.
Are integrally joined to the rubber body 54 by press fitting or baking, and the temperature sensing mechanism 35 and the expansion mechanism 47 are all supported by the rubber body 54.

Here, since the body 54 is used in a refrigerant atmosphere containing compressor lubricating oil, its rubber material has properties such that it is not easily deteriorated by the lubricating oil and the refrigerant, and is unlikely to swell or shrink. Preferably, ethylene propylene (EPDM) rubber is preferable.
A high pressure side refrigerant passage 54a and a low pressure side refrigerant passage 54b are formed in the body 54, and the high pressure side refrigerant passage 54
a connects the second refrigerant inflow hole 321 provided in the second housing 32 to the high pressure space 55. Therefore, the high-pressure liquid refrigerant from the high-pressure-side refrigerant pipe 72 is transferred to the second refrigerant inflow hole 32.
1, the high-pressure-side refrigerant inflow path 54a, the high-pressure space 55, and the passage hole 53a reach the space in the passage cylinder 53 (the space around the valve body 49).

On the other hand, the low pressure side refrigerant passage 54b of the body 54
Makes the refrigerant outflow hole 40 provided in the cup-shaped portion 37 a of the lower diaphragm case 37 communicate with the first refrigerant outflow hole 311 provided in the first housing 31. And
The body 54 is compressed by the first and second housings 31, 32 by a predetermined amount, and the first and second housings 3
It is sandwiched between 1 and 32. As a result, the temperature sensitive mechanism 35 and the entire expansion mechanism 47 are elastically supported (rubber floating) in the housings 31 and 32 by the rubber body 54.

The first of the second housings 32
In the portion to be inserted into the housing 31 of the
2a is formed, and the O-ring 56 is fitted in the groove 32a. The screw hole 57 shown in FIG. 2 is a screw hole of the bolt 67 for screwing the pipe joint member 63 shown in FIG. As shown in FIGS. 3 and 4, the thermal expansion valve 3 is also connected to the refrigerant pipes 70 to 73 so as to also serve as a connecting member that connects the refrigerant pipes on the engine room E side and the vehicle compartment R side. There is.

Further, a circular through hole 74 is formed in the dashboard D, and a rubber-made grommet 75 having a high elasticity is fitted in the through hole 74, and a central hole of the grommet 75. The first housing 31 having the cylindrical outer surface shape of the thermal expansion valve 3 is press-fitted and held therein. Next, to explain the operation in the above configuration, the gas refrigerant evaporated in the evaporator 21 of the cooling unit 2 flows into the low pressure side refrigerant passage 34 from the refrigerant inflow hole 312 of the first housing 31 via the refrigerant pipe 70, It passes through this passage 34. At this time, the temperature of the refrigerant passing through the passage 34 is sensed by the greenhouse 43, and the pressure inside the greenhouse 43 becomes a pressure corresponding to the temperature of the refrigerant.

On the other hand, the pressure chamber 4 below the diaphragm 38
The refrigerant pressure in the low-pressure side refrigerant passage 34 is introduced into 3a through the low-pressure introduction hole 41, and the spring force of the spring 51 acts on the diaphragm 38 via the valve body 49, the valve rod 48, the contact member 45, and the like. As a result, the diaphragm 38 exhibits a displacement corresponding to these forces, the valve body 49 moves to a position corresponding to the displacement of the diaphragm 38, and the opening degree of the throttle passage 39 is adjusted.

By adjusting the opening degree by the valve body 49, the refrigerant at the outlet of the evaporator is maintained at a predetermined degree of superheat determined by the spring force of the spring 51. By the way, when the high-pressure liquid refrigerant from the high-pressure chamber 55 passes through the throttle passage 39 during the above operation, the high-pressure refrigerant is rapidly depressurized and expanded. Then, under the influence of the rapid pressure reduction and expansion of the refrigerant in the throttle passage 39, the valve body 49 repeats minute vibrations.

The vibration of the valve element 49 is caused by the valve rod 48 connected to the valve element 49, the metal contact member 45 contacting the valve rod 48, and the metal contact member contacting the contact member 45. The diaphragm 38 and the diaphragm cases 36 and 37 holding and fixing the outer peripheral portion of the diaphragm 38. However, the temperature sensing mechanism 35 and the expansion mechanism 47 as a whole are
Since the rubber body 54 elastically supports (rubber floating) the housings 31 and 32, the vibration can be absorbed by the rubber body 54.
It is possible to effectively reduce the transmission of the vibration to the housings 31 and 32.

Therefore, it is possible to effectively reduce the vehicle interior noise caused by the vibrations of the housings 31 and 32 propagating to the evaporator 21 through the refrigerant pipes and the like, and the refrigerant pipes themselves vibrating. Further, since the diaphragm cases 36 and 37, which are most problematic for the transmitted sound, are housed in the housings 31 and 32, the vehicle interior noise due to the transmitted sound can be effectively reduced. This makes it possible to provide a very low noise thermal expansion valve.

In the first embodiment, the temperature sensing mechanism 3
5, upper diaphragm case 36 and first housing 31
Between the inner wall surface of the spring holding cylinder 52 of the expansion mechanism 47
A rubber body is additionally installed between, for example, the inner wall surface of the first housing 31 and the temperature sensing mechanism 35 and the expansion mechanism 47.
May be stabilized. FIG. 5 is a graph of experimental results showing the relationship between the hardness of the rubber material used for the rubber body 54 and the expansion valve noise. The experimental conditions are conditions equivalent to when the refrigeration cycle is started, and the cycle high pressure is 12
kg / cm ² , the cycle low pressure is 3 kg / cm ² , and the subcool of the liquid refrigerant flowing into the expansion valve 3 is 15 ° C.

As a condition for noise measurement, a microphone is installed at a position 120 mm away from the expansion valve 3 in the soundproof room, the sound level meter is set to A characteristic, and 20 Hz to 20 Hz.
The average value of noise in the audible frequency range of KHz was measured. As understood from this graph, the hardness of the rubber material is Hs7.
A value of 0 or less is effective for enhancing the noise reduction effect.

However, if the hardness of the rubber material used for the rubber body 54 is extremely low, the support of the temperature sensing mechanism 35 and the expansion mechanism 47 becomes unstable, and the rubber body 5 is not supported.
4, the refrigerant passages 54a, 54b and the housing 3
Since the sealing function of the connection portion with the refrigerant passage holes 311 and 321 on the side of 1 and 32 is deteriorated, the lower limit of the hardness of the rubber material is H.
S50 or more is preferable in order to stabilize the support of both mechanisms 35 and 47 and to secure the sealing property of the passage connecting portion.

Therefore, in practice, the hardness of the rubber material used for the rubber body 54 is preferably set in the range of Hs 50 to 70. In FIG. 5, the noise figure of the aluminum body is the data of the comparative example in which the rubber body 54 is replaced with the aluminum body. (Second Embodiment) FIG. 6 shows a temperature sensing mechanism 35 and a spring 5.
2 shows the second embodiment in which the temperature sensing mechanism 35 itself is configured to be movable by changing the arrangement configuration of the first component and the like. In the lower pressure chamber 43a formed by the lower diaphragm case 37 and the diaphragm 38, a plurality of through holes 37b provided in the diaphragm case 37 (the low-pressure introduction hole 41 of the first embodiment).
The pressure of the refrigerant in the low pressure side refrigerant passage 34 (that is, the pressure of the refrigerant on the outlet side of the evaporator) is introduced through

Further, inside the pressure chamber 43a, there is disposed a contact member 45 which is displaced in accordance with the displacement of the diaphragm 38. The contact member 45 is made of a metal such as stainless steel or aluminum and has a disc shape. The disk-shaped one surface (upper surface) is in contact with the diaphragm 38. Further, a plurality of columnar leg portions 45c are integrally formed from the other surface (lower surface) of the disc portion of the contact member 45.

Through-hole 37 of lower diaphragm case 37
The columnar leg portion 45c is slidably fitted to b, and the tip (lower end) of the columnar leg portion 45c of the abutting member 45 is baked onto the rubber body 54. Pedestal 460 of metal press-molded product joined by
It comes into contact with. More specifically,
The length of the columnar leg portion 45c of the contact member 45 is set so that the tip of the columnar leg portion 45c contacts the pedestal 460 before the lower diaphragm case 37 contacts the pedestal 460.

The valve body 49 is formed of a metal such as stainless steel in a spherical shape. One end of a valve rod 48 formed of a metal such as stainless steel is integrally formed on the spherical valve body 49 by welding or the like. It is joined. The other end of the valve rod 48 is
It is integrally connected to the lower diaphragm case 37 described above by welding, caulking or the like. Here, the lower diaphragm case 37 and the valve rod 48 may be formed as an integral part by cutting instead of having a structure in which separate parts are connected.

The pedestal 460 has a cup-shaped portion 460a that hangs downward from the center of the disc. The valve rod 48 is slidably fitted to the inner wall surface of the cup-shaped portion 460a. The fitting portion between the valve rod 48 and the cup-shaped portion 460a is kept airtight by an O-ring (elastic sealing material) 460b. Further, a throttle passage 39 is formed in the bottom of the cup-shaped portion 460a of the pedestal 460, and a refrigerant outlet hole 40 is formed in the side surface portion (circular wall portion) thereof.

By the way, a metal cover 52a is fixed to the pedestal 460 by caulking, and the metal cover 52a has a plurality of communication holes 52 for communicating the inside and outside thereof.
1 is provided, and the low-pressure refrigerant in the low-pressure side refrigerant passage 34 passes through the communication hole 521 and the diaphragm cases 36, 3
It is designed to flow around 7. A coil spring 51 is arranged on the upper diaphragm case 36, and the upper end of the coil spring 51 is supported by a spring retainer 52c. The spring retainer 52c is configured so that its position can be adjusted by using a screw 52b screwed into the metal cover 52a with the metal cover 52a as a reference plane.

In this embodiment, since the temperature sensing mechanism 35 is configured to be movable separately from the housings 31 and 32, the expansion mechanism 47 is elastically moved into the housings 31 and 32 by the rubber body 54. Supported (rubber floating). To explain the operation of the second embodiment in such a configuration, the gas refrigerant evaporated in the evaporator 21 of the cooling unit 2 flows into the low pressure side refrigerant passage 34 from the refrigerant inflow hole 312 of the first housing 31, Pass through passage 34. At this time, the temperature of the refrigerant passing through the passage 34 is transmitted to the greenhouse 43 through the communication hole 521, and the pressure in the greenhouse 43 becomes a pressure corresponding to the temperature of the refrigerant.

On the other hand, the pressure chamber 4 below the diaphragm 38
The refrigerant pressure in the low-pressure side refrigerant passage 34 is in the through hole 3a.
It is introduced via 7b. Now, when the refrigerant temperature in the low pressure side refrigerant passage 34 rises and the pressure in the greenhouse 43 rises, the diaphragm 38 pushes the upper surface of the contact member 45 downward in FIG. However, the leg portion 45 of the contact member 45
Since c is already in contact with the pedestal 460, the contact member 45
Cannot move downward in FIG. Since the leg portion 45c of the abutting member 45 is slidably fitted in the through hole 37a of the tire flam case 37, the "diaphragm 38 to the abutting member 45 is caused by the pressure increase in the greenhouse 43 described above.
“Pressing force on the contact member 45” means that the leg portion 45c of the contact member 45 and the pedestal 46 are
The entire temperature-sensing mechanism 35 is shown in FIG.
It will act as a force pushing up.

Since the coil spring 51 exerts a spring force downward in FIG. 6 on the temperature-sensing mechanism 35, the coil spring 5 moves when the temperature-sensing mechanism 35 moves upward in FIG.
1 is compressed, its spring force increases, and the temperature-sensing mechanism 35 moves upward in FIG. 6 to a position where this spring force balances with the "pressing force from the diaphragm 38 to the contact member 45".

Since the valve body 49 is integrally connected to the diaphragm case 37 below the temperature sensing mechanism 35 via the valve rod 48, the valve body 48 and the valve body 49 are integrated with the temperature sensing mechanism 35. 6, the valve body 49 moves upward in FIG. 6 to increase the opening degree of the throttle passage 39, increase the flow rate of the refrigerant passing through the throttle passage 39, and increase the superheat degree of the gas refrigerant at the outlet of the evaporator 21. Maintain a predetermined value.

On the contrary, when the temperature of the refrigerant in the low pressure side refrigerant passage 34 decreases and the pressure in the greenhouse 43 decreases, the "pressing force from the diaphragm 38 to the contact member 45" decreases. The entire temperature sensing mechanism 35 is pushed downward in FIG. 6 by the spring force of the coil spring 51, and the valve body 49 reduces the opening degree of the throttle passage 39. The target degree of superheat of the gas refrigerant at the outlet of the evaporator 21 can be changed by adjusting the spring force of the coil spring 51.

Also in this embodiment, the expansion mechanism 47 is elastically supported (rubber floating) in the housings 31 and 32 by the rubber body 54.
Noise reduction of the expansion valve can be realized. In the second embodiment, the metal cover 52a is fixed to the pedestal 460 by caulking, and the spring retainer 52 is fixed by the cover 52a.
c is held and the upper end of the coil spring 51 is supported by the spring retainer 52c.
The cover 52a is not the base 460 but the first housing 31
You may make it support by.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a thermal expansion valve showing a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an exploded perspective view showing a connection structure of the thermal expansion valve shown in FIGS. 1 and 2 with a refrigerant pipe.

FIG. 4 is an overall schematic configuration diagram of an automobile air conditioner using the thermal expansion valve shown in FIGS.

FIG. 5 is a graph showing a relationship between hardness and noise of a rubber body used in the present invention.

FIG. 6 is a vertical cross-sectional view of a thermal expansion valve showing a second embodiment of the present invention.

[Explanation of symbols]

3 ... Thermal expansion valve, 31, 32 ... Housing, 34 ... Low pressure side refrigerant passage, 35 ... Temperature sensing mechanism, 36, 37 ... Diaphragm case, 38 ... Diaphragm, 39 ... Throttle passage, 4
7 ... Expansion mechanism, 48 ... Valve rod, 49 ... Valve body, 54 ... Rubber body.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Kinoshita 1-1 Showa-cho, Kariya city, Aichi Prefecture, Nippon Denso Co., Ltd. (72) Inventor Koji Yamanaka 1-1-chome Showa town, Kariya city, Aichi Nippon Denso Co., Ltd. (72) Inventor Kenichi Fujiwara, 1-1, Showa-machi, Kariya city, Aichi Japan Denso Co., Ltd. (56) Reference JP-A-57-136074 (JP, A) JP-A-6-26741 (JP, A) Actual development Sho 53-100171 (JP, U) Actual development Hei 4-29779 (JP, U) Actual development Sho 57-44373 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 31/64 F25B 41/06

Claims (6)

(57) [Claims] 1. A temperature type expansion valve for decompressing and expanding the refrigerant flowing from a high pressure side refrigerant circuit in response to the degree of superheat of the refrigerant at the evaporator (21) outlet of a refrigeration cycle, the housing member (31) , 32), a throttle passage (39) provided in the housing member (31, 32) for decompressing and expanding the refrigerant flowing from the high pressure side refrigerant circuit, and provided in the housing member (31, 32). And a temperature sensing mechanism (35) housed in the housing member (31, 32), and a valve body (49) for adjusting the opening of the throttle passage (39). In the case (36, 37) of 35), the refrigerant temperature at the outlet of the evaporator (21) and the evaporator (2) are
1) Pressure responsive member (3) that is displaced according to the refrigerant pressure at the outlet
8) is built in, and the valve body (4) is moved in accordance with the displacement of the pressure responsive member (38).
The expansion mechanism (47) including the throttle passage (39) and the valve body (49) and the temperature-sensing mechanism (35) are made to move by a rubber support member (54). ), And is elastically supported by the housing member (31, 32). 2. A temperature type expansion valve for decompressing and expanding the refrigerant flowing from the high pressure side refrigerant circuit in response to the degree of superheat of the refrigerant at the evaporator (21) outlet of the refrigeration cycle, the housing member (31) , 32), a throttle passage (39) provided in the housing member (31, 32) for decompressing and expanding the refrigerant flowing from the high pressure side refrigerant circuit, and provided in the housing member (31, 32). And a valve body (49) for adjusting the opening degree of the throttle passage (39) and a movably housed in the housing member (31, 32) separately from the housing member (31, 32). The temperature sensing mechanism (35) is provided in the case (36, 37) of the temperature sensing mechanism (35), and the refrigerant temperature at the outlet of the evaporator (21) and the evaporator (2).
1) Pressure responsive member (3) that is displaced according to the refrigerant pressure at the outlet
8) is built in, the valve body (49) is integrally connected to the case (36, 37) of the temperature sensing mechanism (35), and the sensing element follows the displacement of the pressure responsive member (38). The temperature mechanism (35) and the valve body (49) are configured to move integrally, and further, the throttle passage (39) and the valve body (49).
The expansion mechanism (47) including a rubber support member (5
4) A thermal expansion valve, which is elastically supported by the housing member (31, 32) through the interposition 4). 3. The rubber supporting member (54) and the temperature sensing mechanism (3) support the expansion mechanism (47).
The temperature type expansion valve according to claim 1, wherein a portion supporting 5) is integrally formed. 4. A high pressure side refrigerant passage (54a) for flowing the refrigerant from said high pressure side refrigerant circuit into said throttle passage (39),
4. The low pressure side refrigerant passage (54b) through which the low pressure side refrigerant that has passed through the throttle passage (39) is formed in the rubber support member (54). The thermal expansion valve according to one. 5. The thermal expansion valve according to claim 1, wherein the rubber hardness of the rubber supporting member (54) is in the range of Hs 50 to 70. 6. A thermal expansion valve (3) according to any one of claims 1 to 5, and a compressor (10) mounted in the engine room (E) for compressing and discharging a refrigerant, and The condensation device group (1) including a condenser (11) that cools and condenses the gas refrigerant discharged from the compressor (10) and the passenger compartment (R) are mounted in the temperature type expansion valve ( An air conditioner for a vehicle, comprising: an evaporator (21) for decompressing and expanding the expanded refrigerant in (3), and a cooling unit (2) for cooling the conditioned air in this evaporator (21). Refrigeration cycle equipment.