JP2001004251A - Leak-proof device for refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart the sealing part of a pipe joint for refrigerating machine with two properties of gas barrier and blister resistance by paying attention to the fact that a blister phenomenon is principally caused by abrupt pressure variation of environment where a rubber gasket is disposed. SOLUTION: A first rubber gasket 4 having high gas barrier properties and low blister resistant properties is disposed on the atmospheric side at the sealing part of a pipe joint for refrigerating machine for coupling the refrigerant piping on the cabin side of the refrigeration cycle of a refrigerating machine with the refrigerant piping 22, 23 on the engine room side. A second rubber gasket 5 having low gas barrier properties and high blister resistant properties is disposed on the refrigerant side at the sealing part of the pipe joint for refrigerating machine. According to the arrangement, refrigerant gas being used in the refrigeration cycle of a refrigerating machine can be prevented from leaking to the atmosphere and blister phenomenon can also be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating machine having a plurality of leak preventing members for preventing a refrigerant used in a refrigerating machine from leaking into the atmosphere. The present invention relates to a leakage prevention device for a refrigerator equipped with a plurality of leakage prevention materials capable of achieving both gas barrier properties (gas permeation resistance) and blister resistance.

[0002]

2. Description of the Related Art Conventionally, a leakage prevention device for a refrigerator has been used for a refrigerator from a seal portion of a refrigerator by combining rubber or rubber and metal or resin which are excellent in assemblability and serviceability. A rubber gasket (O-ring) is provided as a leakage prevention material (sealant) for preventing the refrigerant from leaking into the atmosphere.

[0003] In response to recent global environmental protection activities, there is an increasing need worldwide to reduce leakage of refrigerants such as CFCs and carbon dioxide used in refrigeration cycles into the atmosphere. For this reason, with respect to a rubber gasket used as a leakage prevention material, improvement in characteristics (gas barrier properties) of preventing refrigerant gas from leaking into the atmosphere has been studied.

[0004]

However, if the gas barrier property of the rubber gasket, that is, the gas permeation resistance, is improved, the blister resistance is degraded as a contradictory event. In other words, when the environment in which the rubber gasket is installed is at a high pressure, the refrigerant gas that has entered the rubber gasket is less likely to escape from the rubber gasket even if the environment has a low pressure due to pressure fluctuations. When the refrigerant gas remains in the rubber gasket, foaming (bubbles) occurs in the rubber gasket or cracks (cracks) occur in the rubber gasket (blister phenomenon). Therefore, there has been a problem that it is not possible to obtain a rubber gasket capable of satisfying both the gas barrier properties (gas permeation resistance) and the blister resistance.

[0005]

SUMMARY OF THE INVENTION The present invention focuses on the point that a blister phenomenon occurs mainly due to a sudden pressure fluctuation in an environment in which a leak prevention material is installed, and a gas barrier property is provided in a seal portion of a refrigerator. It is an object of the present invention to provide a leakage prevention device for a refrigerator provided with a plurality of leakage prevention members capable of satisfying two characteristics, that is, resistance to air and blister resistance.

[0006]

According to the first aspect of the present invention, a first leak prevention member having excellent gas barrier properties and inferior blister resistance is disposed on the air side of a seal portion of a refrigerator. By arranging the second leak prevention material having poor gas barrier properties and excellent blister resistance on the refrigerant side of the seal portion of the refrigeration equipment, the gas permeability resistance of the seal portion of the refrigeration equipment is improved. It is possible to reliably prevent the refrigerant from flowing into the atmosphere from the interface between the seal portion and the plurality of first and second leak prevention materials.

On the other hand, regarding the blister resistance, even when the refrigerant side is rapidly depressurized, the second leakage prevention material provided on the refrigerant side in the seal portion of the refrigeration equipment has excellent blister resistance. No blister phenomenon occurs. Further, the first leak prevention material has a blister phenomenon because the pressure between the first and second leak prevention does not change rapidly even when the refrigerant side suddenly depressurizes in the seal portion of the refrigeration equipment. Does not occur. This allows
The seal portion of the refrigeration equipment can achieve both gas barrier properties (gas permeation resistance) and blister resistance.

[0010] According to the second aspect of the present invention, the first leakage prevention member is made to have a longer axial seal width than the second leakage prevention member in the axial direction. , The gas barrier length of the first leakage prevention material can be improved as compared with the second leakage prevention material. On the other hand, the second leakage prevention material having a short gas permeation length is more excellent in blister resistance than the first leakage prevention material because the refrigerant easily escapes.

According to the third aspect of the present invention, by making the cross-sectional area of the second leakage prevention member smaller than the cross-sectional area of the first leakage prevention member, the refrigerant can easily escape from the inside of the second leakage prevention member. Therefore, the blister resistance of the second leakage prevention material can be improved as compared with the first leakage prevention material. On the other hand, since it is difficult for the refrigerant to escape from the inside of the first leakage prevention material, the gas leakage of the first leakage prevention material can be improved as compared with the second leakage prevention material.

According to the fourth aspect of the present invention, the interference of the first leak preventing material is made larger than the interference of the second leak preventing material, so that the material molecules of the first leak preventing material are densely arranged. That is, the gas barrier property of the first leakage prevention material can be improved as compared with the second leakage prevention material. On the other hand, the second leak prevention material is
Since the material molecules are coarsened and the internal strain of the second leakage prevention material is small, the blister resistance is superior to that of the first leakage prevention material.

According to the fifth aspect of the present invention, the material of the first leakage prevention material disposed on the atmosphere side of the seal portion of the refrigeration equipment is replaced with the second leakage prevention material disposed on the refrigerant side of the seal portion of the refrigeration equipment. The effect described in claim 1 can be obtained by using a composition that is excellent in gas barrier properties and inferior in blister resistance with respect to the material of the preventive material.

According to the sixth and seventh aspects of the present invention, the surface of the first leakage prevention member is covered with a material having a better gas barrier property than the material of the first leakage prevention member. Alternatively, the surface of the first leakage prevention material is modified into a structure having good gas barrier properties,
By not performing the surface treatment on the leakage preventing material, the gas barrier property of the first leakage preventing material can be improved more than that of the second leakage preventing material, and the surface layer interface of the first leakage preventing material peels off more than the second leakage preventing material. As a result, the blister resistance of the first leakage prevention material deteriorates.

According to the eighth aspect of the present invention, a material structure having a better gas barrier property than the material of the first leak preventing material is embedded in the first leak preventing material, and the second leak preventing material is not internally processed. Thereby, the gas barrier property of the first leak preventing material can be improved more than that of the second leak preventing material, and the material interface of the first leak preventing material is more easily peeled than the second leak preventing material. Can be made more resistant to blistering than the second leak prevention material.

According to the ninth aspect of the present invention, the first fitting portion such as a convex portion or a concave portion provided on the side of the second leak preventing member of the first leak preventing member and the second fitting portion of the second leak preventing member. (1) By fitting the first leak preventing material and the second leak preventing material together by fitting with a second fitting portion such as a concave portion or a convex portion provided on the side of the leak preventing material, The assemblability to the seal portion can be improved.

According to the tenth aspect of the present invention, the cross-sectional shape of the first leakage prevention member is substantially square, and the cross-sectional shape of the second leakage prevention member is substantially circular, substantially oval, or substantially elliptical. By doing so, local deformation in the axial direction of the second leakage prevention member can be suppressed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIGS. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a diagram showing a refrigeration cycle for a refrigerator, and FIG. In the diagram shown, FIG.
(A), (b) is a figure which showed the seal part of the piping joint for refrigerators, FIG.4 (a), (b) is a figure which showed the seal part of the piping joint for refrigerators.

The refrigeration cycle 10 for a refrigerator according to the present embodiment comprises:
1 is a refrigeration cycle of a vehicle air conditioner that air-conditions (mainly cools) a vehicle compartment of a vehicle equipped with an engine. The refrigeration cycle 10 for a refrigerator is a refrigerant compressor (compressor) 1 that is belt-driven by an engine to compress and discharge the refrigerant.
1. Refrigerant condenser (condenser) 12 for condensing and liquefying the refrigerant gas discharged from the compressor 11, gas-liquid separator (receiver) 13 for temporarily storing the refrigerant flowing from the condenser 12, and flowing from the receiver 13. An expansion valve 14 for reducing and expanding the liquid refrigerant; a refrigerant evaporator (evaporator) 15 for evaporating the refrigerant flowing from the expansion valve 14;
And a piping joint 20 for a refrigerator attached to a dashboard 19 for partitioning the refrigerator. In addition, 12a is a cooling fan and 15a is a blower fan.

The piping joint 20 for the refrigerator corresponds to the leakage prevention device for the refrigerator of the present invention, and includes a refrigerant pipe 21 connected to the outlet of the receiver 13 and a refrigerant pipe 22 connected to the inlet of the expansion valve 14. Airtight connection and evaporator 1
This is a refrigeration apparatus that hermetically connects a refrigerant pipe 23 connected to the outlet of the compressor 5 and a refrigerant pipe 24 connected to the suction port of the compressor 11.

The pipe joint 20 for the refrigerator includes a mounting block 1 mounted on the dashboard 19, a mounting plate 2 mounted on the mounting block 1, a fixing bolt 3 for fastening the mounting plate 2 to the mounting block 1, And a plurality of first and second rubber gaskets 4, 5 for preventing leakage of the refrigerant gas or liquid refrigerant to the atmosphere.

The refrigerant pipe 21 has a circular pipe shape and the receiver 1
3 is a high-pressure side metal pipe connecting the outlet of No. 3 and the inlet of the refrigerant pipe 22. The refrigerant pipe 22 corresponds to the structure of the present invention, and is a high-pressure side metal pipe that has a circular pipe shape and connects an outlet of the refrigerant pipe 21 and an inlet of the expansion valve 14. The refrigerant pipe 23 corresponds to the structure of the present invention, and has a circular pipe shape having a larger radius than the refrigerant pipe 22, and is a low-pressure side metal pipe connecting the outlet of the evaporator 15 and the inlet of the refrigerant pipe 24. It is. In addition, refrigerant pipe 2
Reference numeral 4 denotes a low-pressure side metal pipe that has a circular pipe shape having a larger radius than the refrigerant pipe 21 and connects the outlet of the refrigerant pipe 23 and the suction port of the compressor 11. In addition, the refrigerant pipe 21,
Metal pipe was used as 24, but chlorinated butyl rubber +
A rubber hose such as nylon or nitrile butadiene rubber may be used.

Annular flanges 31 and 32 projecting outward in the radial direction are formed on the outer periphery of the distal end portions of the refrigerant pipes 22 and 23 on the cabin 17 side by press molding or the like. . And, the flange portions 31 of the refrigerant pipes 22 and 23,
On the distal end side than 32, inserted portions (seal portions) inserted into the communication holes (seal portions) 37 and 38 of the mounting block 1.
33 and 34. Those insertion parts 33, 3
On the outer peripheral surface of 4, there are provided concave portions 35, 36 for mounting the first and second rubber gaskets 4, 5, respectively.

The mounting block 1 corresponds to the structure of the present invention, and is integrally formed into a rectangular parallelepiped shape by metal or resin, and is held and fixed to the hole of the dashboard 19 via a sealing material such as rubber packing. Have been. Inside the mounting block 1, two communication holes 37 into which the plugged portions 33, 34 of the two refrigerant pipes 22, 23 are inserted,
38 are formed.

At one end of each of the communication holes 37 and 38,
Annular fitting grooves 41, 42 into which the flange portions 31, 32 of the two refrigerant pipes 22, 23 are fitted are formed, and two refrigerant pipes are provided at one end side of the communication holes 37, 38. 21, 24
Is fixed by using a joining means such as welding in a state where the tip of the is inserted. Also, inside the mounting block 1,
A screw hole 40 into which the fixing bolt 3 is screwed is formed.

The mounting plate 2 is integrally formed of metal or resin into a predetermined shape. This mounting plate 2
Are formed with two communication holes 43, 44 through which the two refrigerant pipes 22, 23 penetrate. Further, an insertion hole 45 through which the fixing bolt 3 is inserted is provided inside the mounting plate 2.
Are formed.

The first and second rubber gaskets 4 and 5 correspond to the first and second leak prevention members of the present invention, and as shown in FIG. 1 to FIG. , 23 and through holes 37, 38 in the mounting block 1.
In the state of being sandwiched between the inner peripheral surface of the
It is held and fixed between 23 and the mounting block 1.

The first rubber gasket 4 is mounted on the seal of the piping joint 20 for the refrigerator, that is, on the air side between the refrigerant pipes 22 and 23 and the mounting block 1. The first rubber gasket 4 is superior to the second rubber gasket 5 in gas barrier properties for preventing leakage of refrigerant gas (fluorocarbon gas or carbon dioxide gas) or liquid refrigerant into the atmosphere, and the first rubber gasket 4 is formed by pressure fluctuation of the refrigerant. An O-ring (sealing material) having inferior blister resistance for preventing cracks in itself and foaming of the first rubber gasket 4.

The second rubber gasket 5 is mounted on the seal portion of the piping joint 20 for the refrigerator, that is, on the refrigerant side between the refrigerant pipes 22 and 23 and the mounting block 1. The second rubber gasket 5 is an O-ring (seal material) that is inferior to the first rubber gasket 4 in gas barrier properties and more excellent in blister resistance than the first rubber gasket 4.

The materials of the first and second rubber gaskets 4 and 5 include fluoro rubber, butyl rubber, nitrile rubber (hydrogenated nitrile rubber), chloropyrene rubber, chlorosulfonated rubber, urethane rubber, epichlorohydrin rubber, polysulfide rubber, A thermosetting rubber composition or a thermoplastic rubber composition having rubber elasticity, such as ethylene propylene rubber, silicone rubber, or acrylic rubber, or a blend of these is used.

In particular, the first rubber gasket 4 is made of a combination of fluorine rubber and the second rubber gasket 5 made of nitrile rubber (hydrogenated nitrile rubber), or the first rubber gasket 4 is made of fluorine rubber and the second rubber gasket 5 is made of ethylene propylene rubber. Excellent characteristics can be obtained by a combination of a nitrile rubber (hydrogenated nitrile rubber) for the first rubber gasket 4 and ethylene propylene rubber for the second rubber gasket 5, but effects can be obtained by other combinations.

Further, even when the same polymer is used for the first and second rubber gaskets 4, 5, there is a difference between the gas barrier property and the blister resistance in the state of the composition containing the filler, the crosslinking agent and the like. A similar effect can be obtained.

As shown in FIG. 3B, the surface of the first rubber gasket 4 is covered with a surface coating material 6 having a gas barrier property better than that of the material of the first rubber gasket 4, or the first rubber gasket 4 The surface of No. 4 may be modified into a structure having good gas barrier properties. On the other hand, the second rubber gasket 5 is not surface-treated. Thereby, the gas barrier property of the first rubber gasket 4 can be improved, and the first rubber gasket 4
Since the surface layer interface of the second rubber gasket 5
Blister resistance is worse than that.

Examples of the surface covering material 6 for covering the surface of the first rubber gasket 4 include metals such as gold, silver and aluminum, and resins such as fluororesin and urethane resin. The material of the surface covering material 6 is not limited as long as it satisfies the condition of being excellent and inferior in blister resistance. Examples of a coating method for coating the surface of the first rubber gasket 4 with the surface coating material 6 include coating, plating, vapor deposition, and adhesion, but any method may be used as long as the above conditions are satisfied. The method of modifying the surface of the first rubber gasket 4 includes halogenation and surface hardening, but any method may be used as long as the above conditions are satisfied.

As shown in FIG. 4A, the second rubber gasket 5 side of the first rubber gasket 4, which is inferior in blister resistance, has a flat surface, and a first fitting of a convex portion on the flat surface. A portion (projection) 4a may be provided. The first rubber gasket 4 of the second rubber gasket 5 having excellent blister resistance
Side is a flat surface, and the second fitting portion 5a of the concave portion is formed on the flat surface.
May be provided.

The first rubber gasket 4 and the second rubber gasket 5 are made of an elastomer material (a thermosetting rubber composition or a thermoplastic rubber composition having rubber elasticity as described above, or a composition obtained by blending them). )
The first and second fitting portions 4a, 5a are integrally molded (integrated) so as to be fitted, so that the refrigerant pipes 22, 2
3 can be improved. A first fitting portion such as a concave portion is provided on the second rubber gasket 5 side of the first rubber gasket 4, and a first fitting portion such as a convex portion (projecting portion) is provided on the second rubber gasket 5 side on the first rubber gasket 4 side. Two fitting portions may be provided.

As shown in FIG. 4B, the cross-sectional shape of the first rubber gasket 4 disposed on the atmosphere side between the refrigerant pipes 22 and 23 and the mounting block 1 is substantially square, and The cross-sectional shape of the second rubber gasket 5 disposed on the refrigerant side between the pipes 22 and 23 and the mounting block 1 may be substantially circular, substantially elliptical, or substantially elliptical. In this case, even if the pressure of the refrigerant becomes high, local deformation in the axial direction of the second rubber gasket 5 installed on the refrigerant side can be reduced.

[Characteristics of the first embodiment] As described above, the refrigerant pipes (first structure) 22 and 23 and the mounting block (second structure) 1
A first rubber gasket 4 having excellent gas barrier properties and inferior blister resistance is disposed on the atmosphere side between the first and second refrigerant pipes (first structures) 22 and 23 and the mounting block (second structure) 1.
A second rubber gasket 5 which is inferior to the first rubber gasket 4 in gas barrier property and more excellent in blister resistance than the first rubber gasket 4 is disposed on the refrigerant side between the first and second rubber gaskets 4.

When the gas permeation amount of the first rubber gasket 4 is P1 and the gas permeation amount of the second rubber gasket 5 is P2, the pressure between the first and second rubber gaskets 4 and 5 is equal to the refrigerant side. The pressure is reduced at a ratio of P2 / (P1 + P2) to the pressure. For this reason, since the gas barrier property of the first rubber gasket 4 can be improved more than that of the second rubber gasket 5, it is possible to prevent the refrigerant (for example, CFC gas or carbon dioxide gas) used in the refrigerator from leaking to the atmosphere. it can.

On the other hand, regarding the blister resistance for preventing cracking and foaming of the sealing material, the blister phenomenon does not occur because the second rubber gasket 5 has excellent blister resistance even when the pressure on the refrigerant side is rapidly reduced. Also, even when the pressure of the refrigerant side is suddenly reduced, the pressure between the first and second rubber gaskets 4 and 5 does not change abruptly, so that no blister phenomenon occurs in the first rubber gasket 4. Therefore, it is possible to provide the refrigerator-use piping joint 20 including the first and second rubber gaskets 4 and 5 that can achieve both the gas barrier properties (gas permeation resistance) and the blister resistance.

Second Embodiment FIGS. 5 and 6 show a second embodiment of the present invention. FIG. 5 is a view showing a refrigeration cycle for a refrigerator, and FIG. 6 is a pipe joint for a refrigerator. FIG.

The refrigerator pipe joint 20 of this embodiment corresponds to a refrigerator leakage prevention device of the present invention, and is attached to a hole formed in a dashboard similarly to the first embodiment. This is a refrigeration apparatus in which two refrigerant pipes 23 and 24 connecting the outlet of the evaporator 15 and the suction port of the compressor 11 are connected in series.

The pipe joint 20 for the refrigerator is composed of a plurality of first and second rubber gaskets (leakage preventive material, seal material) for preventing the refrigerant (Freon gas, carbon dioxide gas, etc.) from leaking into the atmosphere.
4, 5, a male block 7 having a concave portion 51 to which the first and second rubber gaskets 4, 5 are mounted, and a concave shape fitted to a convex seal portion 52 of the male block 7. It comprises a female block 8 having a seal portion 53 and fixing bolts 9 for fastening and fixing the male block 7 to the female block 8.

The male block 7 has a through hole 54 into which the distal end of the refrigerant pipe 23 is inserted and through which refrigerant gas flows.
And an insertion hole 55 through which the fixing bolt 9 is inserted. An annular fitting groove 56 is formed in the through hole 54 and is fixed by fixing means such as welding in a state where the tip of the refrigerant pipe 23 is fitted. In addition, the seal part 52
It is formed in the shape of a circular tube, and protrudes toward the female block 8 from a joint surface (one end surface) that joins the female block 8. A concave portion 51 is provided around the outer periphery of the seal portion 52.

The female block 8 has a through hole 57 into which the distal end of the refrigerant pipe 24 is inserted and through which refrigerant gas flows.
And a screw hole 58 into which the fixing bolt 9 is screwed. An annular fitting groove 59 is formed in the through hole 57 and is fixed by fixing means such as welding in a state where the tip of the refrigerant pipe 24 is fitted.

The first and second rubber gaskets 4 and 5 correspond to the first and second leak prevention members of the present invention, and are formed of the concave portion 51 of the seal portion 52 of the male block 7 and the female block 8. The male block 7 and the female block 8 hold and are fixed between the seal portion 53 and the male block 7 and the female block 8. And the first
The intended effect can be obtained by making the material of the rubber gasket 4 a composition that is superior in gas barrier properties to the material of the second rubber gasket 5 and inferior in blister resistance.

The pipe joint 20 for a refrigerator according to this embodiment is provided on the atmosphere side between the seal portion 52 of the male block (first structure) 7 and the seal portion 53 of the female block (second structure) 8. A first rubber gasket 4 having an excellent gas barrier property and inferior blister resistance is disposed on the sealing portion 52 of the male block (first structure) 7 and a sealing portion 53 of the female block (second structure) 8. A second rubber gasket 5 which is inferior to the first rubber gasket 4 in gas barrier property and more excellent in blister resistance than the first rubber gasket 4 is disposed on the refrigerant side between the first and second rubber gaskets 4. Thereby, the same effect as in the first embodiment can be obtained.

[Third Embodiment] FIG. 7 shows a third embodiment of the present invention and is a view showing the entire structure of a compressor incorporated in a refrigeration cycle of a vehicle air conditioner.

The compressor 11 of the present embodiment is a so-called swash plate type refrigerant compressor, and has radial bearings 65, 6 in shaft holes 63, 64 formed in cylinder housings 61, 62.
6, a swash plate 68 that is rotatably supported via the shaft 6, is attached to the outer periphery of the shaft 67 in an inclined state, and rotates integrally with the shaft 67, and a hemispherical shoe 69 is provided on the outer periphery of the swash plate 68. Piston 70 assembled through the first and first to prevent the refrigerant from leaking to the atmosphere
A third compressor leakage prevention device and the like are provided, and the piston 70 is rotated by the rotation of the swash plate 68 so that the cylinder housings 61, 6
It is a structure that compresses the refrigerant by reciprocating in the inside 2.

On both end surfaces of the cylinder housings 61 and 62, suction valves 71 and 72, a valve plate 73,
74 and discharge valves 75 and 76 are assembled in this order, and are sandwiched between a front housing 77 and a rear housing 78, respectively. The valve plates 73 and 74 are formed with suction holes 81 and 82 and discharge holes 83 and 84 opened and closed by the suction valves 71 and 72 and the discharge valves 75 and 76, respectively.

The front housing 77 and the rear housing 78 are connected to the cylinder housing 6 at their outer peripheral portions.
1, 62 are fastened and fixed by a plurality of through bolts (not shown). In the front housing 77 and the rear housing 78, discharge chambers 85 and 86 communicating with discharge ports (not shown) and suction chambers 87 and 88 communicating with suction ports (not shown) are formed. ing.

The first leakage prevention device for a compressor according to the present embodiment includes an annular seal portion provided on the outer peripheral portion of a front housing (second structure) 77 and a cylinder housing (first structure) 61. The first and second rubber gaskets 4 and 5 are provided between the first rubber gasket 4 and the annular concave portion (seal portion) 91 provided on one end surface of the first rubber gasket. In addition, the second compressor leakage prevention device includes an annular concave portion (seal portion) 92 and a cylinder housing (second structure) 62 provided on the other end surface of the cylinder housing (first structure) 61. The first and second rubber gaskets 4 and 5 are provided between the first and second rubber gaskets 4 and 5 between the annular seal portions provided on one end surface of the first rubber gasket.

Further, the third compressor leakage prevention device comprises:
An annular concave portion (seal portion) 93 provided on the other end surface of the cylinder housing (first structure) 62 and an annular seal portion provided on the outer peripheral portion of the rear housing (second structure) 78 The first and second rubber gaskets 4 and 5 are disposed between the first and second rubber gaskets. And, by making the material of the first rubber gasket 4 a gas barrier property superior to that of the material of the second rubber gasket 5 and inferior in blister resistance,
The desired effect can be obtained.

In other words, the leak prevention device for each compressor of the compressor 11 of the present embodiment has an excellent gas barrier property on the air side of each of the above-mentioned seal portions for airtightness between the refrigerant side and the air side, and has a blister resistance. A first rubber gasket 4 having inferior properties is arranged, and a second rubber gasket which is inferior to the first rubber gasket 4 in gas barrier property and more excellent in blister resistance than the first rubber gasket 4 is provided on the refrigerant side of each seal portion. 5 are arranged. Thereby, the same effect as in the first embodiment can be obtained.

[Fourth Embodiment] FIG. 8 shows a fourth embodiment of the present invention and is a view showing seal portions of first and second structures which constitute one component of a refrigerator.

In the leakage prevention device for a refrigerator according to the present embodiment, an annular concave portion 95 formed on the outer peripheral surface of the seal portion of the first structure 94, which is a component of the refrigerator, and one configuration of the refrigerator. The first rubber gasket 4 is arranged on the air side between the seal part 98 of the second structure 97 constituting a part, and the second rubber gasket 5 is arranged on the refrigerant side between the seal parts.

In this embodiment, the seal width in the axial direction (left-right direction in the drawing) of the first rubber gasket 4 which is excellent in gas barrier properties and inferior in blister resistance is inferior to that of the first rubber gaskets 4. The first rubber gasket 4 is formed so as to be longer than the seal width of the second rubber gasket 5 which is excellent in blister resistance in the axial direction (left-right direction in the drawing).
Used is larger than the cross-sectional area of the second rubber gasket 5.

Therefore, as in this embodiment, the first and second rubber gaskets 4 are so formed that the axial seal width is longer than the axial seal width of the second rubber gasket 5.
By being sandwiched between the structures 94 and 97, the gas permeation length of the first rubber gasket 4 is further increased, and the gas barrier property for preventing gas from leaking to the atmosphere is excellent.

On the other hand, the second rubber gasket 5, which has a shorter gas transmission length than the first rubber gasket 4, more easily releases gas than the first rubber gasket 4. Excellent blister properties. Thereby, the same effect as in the first embodiment can be obtained.

[Fifth Embodiment] FIG. 9 shows a fifth embodiment of the present invention and is a view showing seal portions of first and second structures which constitute one component of a refrigerator.

In the leakage prevention device for a refrigerator according to the present embodiment, the seal portion of the first structure 94 constituting one component of the refrigerator and the seal portion 98 of the second structure 97 constituting the component of the refrigerator are provided. The first rubber gasket 4 is arranged on the air side between
In addition, the second rubber gasket 5 is disposed on the refrigerant side between the seal portions.

Incidentally, the outer peripheral surface of the seal portion of the first structural body 94 has an annular concave portion 95 on which the first rubber gasket 4 is mounted on the outer periphery, and the annular annular portion 95 on which the second rubber gasket 5 is mounted on the outer periphery. Are formed, and an annular partition wall 99 for partitioning between the concave portions 95 and 96 is formed.

In the present embodiment, a second section having a smaller cross-sectional area than the first rubber gasket 4 is provided on the outer periphery of the concave section 96 whose axial dimension is shorter than the concave section 95 and whose depth from the sealing surface is shallow. A rubber gasket 5 is used. When the cross-sectional area of the second rubber gasket 5 is smaller than that of the first rubber gasket 4 as described above, the gas is easily released as compared with the first rubber gasket 4. Excellent blister properties.

On the other hand, since the first rubber gasket 4 adopts the above configuration, the cross-sectional area is larger than the second rubber gasket 5 and the seal width in the axial direction is larger than that of the second rubber gasket 5. It is excellent in gas barrier properties to prevent leakage of the gas into the atmosphere. Thereby, the same effect as in the first embodiment can be obtained.

[Sixth Embodiment] FIG. 10 shows a sixth embodiment of the present invention.
It is a figure showing a seal part of the 2nd structure.

The leakage prevention device for a refrigerator according to the present embodiment
The difference from the embodiment is that the annular concave portion 96 formed on the outer peripheral surface of the seal portion of the first structure 94 is formed so that the depth is larger than the concave portion 95.

Therefore, in the present embodiment, by adopting the above configuration, the interference of the first rubber gasket 4 is made larger than that of the second rubber gasket 5, so that the material gap of the first rubber gasket 4 is reduced. Since the density is high, gas barrier properties for preventing gas from leaking to the atmosphere can be improved.

On the other hand, in the second rubber gasket 5, since the material molecules of the second rubber gasket 5 become coarse, the internal strain with respect to the compressive stress or the tensile stress applied to the second rubber gasket 5 becomes small. The gasket 5 is excellent in blister resistance for preventing a blister phenomenon.

[Modification] A structure made of a material having a better gas barrier property than the material of the first rubber gasket 4 may be embedded in the first rubber gasket 4. On the other hand, the second
The rubber gasket 5 is not processed. Thereby, the gas barrier property of the first rubber gasket 4 can be improved. Further, since the material interface of the first rubber gasket 4 is easily peeled off, the blister resistance can be made worse than that of the second rubber gasket 5.

The internal structure embedded in the first rubber gasket 4 is made of metal such as aluminum, resin such as fluororesin, polyamide resin, or rubber such as fluororubber, butyl rubber, nitrile rubber (hydrogenated nitrile rubber). The material is not limited as long as the above conditions are satisfied.

In the present embodiment, the leakage prevention device for a refrigerator according to the present invention is provided with a piping joint 20 for a refrigerator for preventing leakage of refrigerant to the atmosphere or a compressor for preventing leakage of refrigerant to the atmosphere of a compressor 11. An example in which the present invention is applied to a leak prevention device has been described. However, a refrigerant pipe connecting the condenser 12, a gas-liquid separator such as a receiver 13, a decompression device such as an expansion valve 14, an evaporator 15, and other refrigerant pipes at other locations. The present invention may be applied to a refrigerator leakage prevention device for preventing refrigerant from leaking into the atmosphere from refrigeration equipment such as a joint. Further, as the sealing method of this embodiment, a cylindrical sealing method, an end sealing method, or the like may be used.

In this embodiment, an example is described in which a refrigeration cycle for a refrigerator used in a vehicle air conditioner is used as a refrigerator. However, a refrigerator for a vehicle, a refrigerator for a vehicle, a refrigerator for a vehicle, A refrigeration cycle for a refrigerator used in a residential air conditioner, a store air conditioner, and a factory air conditioner may be employed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a refrigeration cycle for a refrigerator (first embodiment).

FIG. 2 is a sectional view showing a pipe joint for a refrigerator (first embodiment)
Example).

FIGS. 3A and 3B are cross-sectional views showing a seal portion of a pipe joint for a refrigerator (first embodiment).

FIGS. 4A and 4B are cross-sectional views showing a seal portion of a pipe joint for a refrigerator (first embodiment).

FIG. 5 is a configuration diagram showing a refrigeration cycle for a refrigerator (second embodiment).

FIG. 6 is a sectional view showing a pipe joint for a refrigerator (second embodiment)
Example).

FIG. 7 is a sectional view showing the entire structure of a compressor (third embodiment).

FIG. 8 is a sectional view showing a seal portion of the first and second structures (fourth embodiment).

FIG. 9 is a sectional view showing a seal portion of the first and second structures (fifth embodiment).

FIG. 10 is a sectional view showing a seal portion of the first and second structures (sixth embodiment).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mounting block (structure) 2 Mounting plate 3 Fixing bolt 4 1st rubber gasket (1st leak prevention material) 5 2nd rubber gasket (2nd leak prevention material) 6 Surface coating material 7 Male block (1st structure) 8) female block (second structure) 10 refrigeration cycle for refrigerator 11 compressor (refrigeration equipment) 12 condenser (refrigeration equipment) 13 receiver (refrigeration equipment) 14 expansion valve (refrigeration equipment) 15 evaporator (refrigeration equipment) 20 refrigeration Pipe fitting for machine (leakage prevention device for refrigerator, refrigeration equipment) 22 Refrigerant pipe (structure) 23 Refrigerant pipe (structure) 33 Inserted part (seal part) 34 Inserted part (seal part) 35 Recessed part 36 Recessed part Part 37 Communication hole (seal part) 38 Communication hole (seal part) 52 Seal part 53 Seal part 94 First structure 95 Concave part 96 Concave part 97 Second structure Body 98 seal portion 4a first fitting portion 5a second fitting portion

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // F16L 17/00 F16L 17/00 (72) Inventor Hideo Harada 1-1-1 Showa-cho, Kariya-shi, Aichi Co., Ltd. F term in DENSO (reference) 3H014 AA09 3J040 AA02 AA13 AA15 AA17 BA02 BA03 CA02 EA16 EA47 EA48 FA06 HA07 HA15

Claims (10)

[Claims] (A) a refrigerating device having a seal portion for hermetically sealing a refrigerant side and an air side; and (b) a refrigerant portion disposed on the air side in the seal portion of the refrigerating device to prevent leakage of the refrigerant to the atmosphere. A first leak prevention member which is excellent in gas barrier properties for preventing and is inferior in blister resistance for preventing cracks from being caused by pressure fluctuation of the refrigerant, and (c) disposed on the refrigerant side in a seal portion of the refrigeration equipment. A leakage prevention device for a refrigerator, comprising: a second leakage prevention member that is inferior to the first leakage prevention member in the gas barrier property and more excellent in the blister resistance than the first leakage prevention member. 2. The leakage prevention device for a refrigerator according to claim 1, wherein the first leakage prevention member is provided so as to have a longer axial seal width than the second leakage prevention member. A leak prevention device for refrigerators. 3. The leakage prevention device for a refrigerator according to claim 1, wherein the second leakage prevention member is provided so as to have a smaller sectional area than the first leakage prevention member. A leakage prevention device for a refrigerator. 4. The method according to claim 1, wherein:
The leakage prevention device for a refrigerator according to any one of claims 1 to 3, wherein the first leakage prevention material is provided so that a tightening margin is larger than that of the second leakage prevention material. 5. The method according to claim 1, wherein
In the leakage prevention device for a refrigerator according to (1), as the material of the first leakage prevention material, a composition excellent in the gas barrier property with respect to the material of the second leakage prevention material and inferior in the blister resistance is used. A leak prevention device for a refrigerator, which is used. 6. One of claims 1 to 5
The leak preventing device for a refrigerator according to any one of claims 1 to 3, wherein the first leak preventing material covers a surface thereof with a material having a better gas barrier property than the material of the first leak preventing material. Prevention device. 7. The method according to claim 1, wherein:
The leak prevention device for a refrigerator according to any one of claims 1 to 3, wherein the first leak prevention material has a surface modified to have a structure having the gas barrier property. 8. One of claims 1 to 5
The leak prevention device for a refrigerator according to any one of claims 1 to 3, wherein the first leak prevention material has a material structure having a better gas barrier property than the material of the first leak prevention material embedded therein. Leak prevention device. 9. The method according to claim 1, wherein
In the leakage prevention device for a refrigerator, the first leakage prevention member has a first fitting portion such as a convex portion or a concave portion on the side of the second leakage prevention material, and the second leakage prevention member. The material includes a second portion such as a concave portion or a convex portion fitted to the first fitting portion on the first leak prevention material side.
A leakage prevention device for a refrigerator having a fitting portion, wherein the first leakage prevention member and the second leakage prevention member are integrated. 10. The leakage prevention device for a refrigerator according to claim 1, wherein a cross-sectional shape of the first leakage prevention material is substantially rectangular, and the second leakage prevention material is substantially rectangular. A leak prevention device for a refrigerator, wherein the cross-sectional shape of the device is substantially circular, substantially elliptical, or substantially elliptical.