JPH0740139Y2 - Expansion valve for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a cooling device that reduces noise when refrigerant gas rapidly flows from a liquid receiver to an evaporator through an expansion valve as the cooling device operates. Expansion valve for a vehicle.

[Prior Art] This type of expansion valve is disclosed in Japanese Utility Model Publication No. 62-105465 and Japanese Utility Model Publication No. 62-
It is disclosed in Japanese Patent No. 80163. As shown in FIG.
The expansion valve disclosed in Japanese Utility Model Laid-Open No. 62-105465 has a vertical inlet chamber 17 in the lower half of the valve housing 22 and a lateral outlet chamber in the middle.
23 are provided, the inlet chamber 17 is fitted with an inlet pipe 21 extending from the outlet side of the liquid receiver, and the nut 20 is fitted with a nipple 19.
It is screwed and fastened. The outlet chamber 23 is fitted with an outlet pipe 25 extending from the inlet side of the evaporator, and a nut 26 is fitted with a nipple 24.
It is screwed and fastened.

The valve body 15 that opens and closes the valve hole 14 that connects the inlet chamber 17 and the outlet chamber 23,
It is opened by an actuator connected to the stem 13 of the valve body 15 against the force of the spring 16 interposed between the hollow screw 18 screwed into the inlet chamber 17 and the valve body 15.

The actuator installed at the upper end of the valve housing 22 is
The chamber 4 and the chamber 3 are partitioned by connecting the peripheral portion of the metal diaphragm 8 to the housing 4, and the metal diaphragm 8 is connected to the stem 13 via the contact plate 5. The weak spring 2 is interposed between the slide body 9 connected to the contact plate 5 and the seat plate that presses the seal member 12 between the outlet chamber 23 and the stem 13. The pressure inside the well-known heat-sensitive cylinder for sensing the temperature on the outlet side of the evaporator (not shown) is introduced into the chamber 7 via the pressure guiding pipe 6. The pressure on the outlet side of the evaporator is introduced into the chamber 3 via the pressure equalizing pipe 10.

In the conventional expansion valve described above, the valve body 15 has the valve body 15 corresponding to the pressure of the chamber 7 that changes depending on the temperature of the refrigerant on the outlet side of the evaporator and the pressure of the chamber 3 on which the refrigerant on the outlet side of the evaporator acts. The flow rate of the refrigerant gas flowing from the condenser side to the evaporator side is controlled by separating from and contacting the valve hole 14. When the air conditioner is operating, the refrigerant liquid in the inlet chamber 17 has a valve hole.
Since the refrigerant gas expands under reduced pressure to flow into the outlet chamber 23 via 14 and becomes a refrigerant gas, noise is generated along with the flow of the refrigerant gas at this time.

[Problems to be Solved by the Invention] In the conventional expansion valve, since the inlet pipe and the outlet pipe are directly connected to the valve housing 22, the flow noise of the refrigerant gas is transmitted from the valve housing 22 through the outlet pipe 25 to the evaporator. There is a problem that it is transmitted to the vehicle, amplified by the evaporator, and radiated into the passenger compartment. Particularly in a high-class passenger car, the noise transmitted from the expansion valve to the passenger compartment in which the evaporator is installed is difficult to tolerate.

In view of the above problems, an object of the present invention is to provide an expansion valve for a cooling device, which suppresses the flow noise of the refrigerant gas flowing through the expansion valve from being transmitted to the evaporator and keeps the vehicle interior quiet. is there.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the structure of the present invention is such that a flange is formed at the upper end of a cylindrical valve housing, a temperature sensing part is provided at the top of the valve housing, and an inlet is provided at the middle part. And an outlet at the bottom, and a valve body connected to the responsive member of the temperature sensing section is provided in a valve hole connecting the inlet and the outlet to form an expansion valve, and a step is provided at the top of the cylindrical case. A large-diameter cylindrical portion through an intermediate portion, an inlet opening communicating with the outlet of the liquid receiver in the middle portion, and an outlet opening communicating with the inlet of the evaporator in the lower portion. A pair of annular elastic members are externally fitted, the valve housing is fitted inside the case such that the pair of elastic members sandwich the inlet opening of the case, and the flange of the valve housing is inserted through the annular elastic member. Placed and supported on the step, and an elastic contact member is placed on the upper surface of the flange. Then, a fixture is applied and the fixture is locked to the large-diameter cylindrical portion of the case.

[Operation] Since the cassette-shaped valve body, that is, the entire expansion valve is elastically supported inside the case via the elastic member, the flow noise when the refrigerant gas passes through the expansion valve is attenuated by the elastic member, and the valve housing moves to the case. The flow noise transmitted to the evaporator via the outlet pipe is suppressed, and the interior of the vehicle in which the evaporator is installed is kept quiet.

[Embodiment of the Invention] FIG. 1 is a side sectional view of an expansion valve for a cooling device according to the present invention.
FIG. 2 is a plan view of the same. According to the present invention, the expansion valve 1 is a cassette-shaped valve body inside the cylindrical case 32 connecting the inlet pipe 21 extending from the liquid receiver and the outlet pipe 25 extending from the evaporator, and the elastic contact member is provided. 28a and elastic members 30, 31 are elastically fitted and supported. The inlet pipe 21 is coupled to the inlet opening in the middle portion of the peripheral wall of the case 32, and the outlet pipe 25 is coupled to the outlet opening at the lower end.

The expansion valve 1 is almost the same as the conventional one shown in FIG.
Common components are designated by the same reference numerals. Valve housing
A temperature sensitive part is formed at the upper end of 22. That is, at the center of the metal diaphragm 8 whose peripheral edge is sandwiched by the end plate 4,
The valve body 15 is connected via the contact plate 5. The heat-sensitive cylinder is connected to the upper chamber of the metal diaphragm 8 via the pressure guiding pipe 6, while the pressure equalizing pipe 10 is connected to the lower chamber. Valve housing 22
An outlet chamber 23 is formed in the lower half part of the outlet chamber 23, and a valve hole 14 opened and closed by a valve body 15 is formed at the upper end of the outlet chamber 23, and an inlet 17 crossing the valve hole 14.
a and are formed. In order to airtightly connect the inlet pipe 21 and the inlet 17a and elastically support the valve housing 22 to the case 32, the inlet is provided in a pair of annular grooves on the peripheral wall of the valve housing 22.
An elastic member 3 including an O-ring sandwiching the upper side and the lower side of 17a 3
The outer casing 1 is elastically abutted on the cylindrical portion 32a of the case 32 while being externally packaged.

A spring 16 is interposed between a valve body 15 and a screw 18a screwed into the lower end of the outlet chamber 23. The outlet chamber 23 passes through the outlet 33 and the case 32
And the valve housing 22. An upper end side of the step 32 of the case 32 is a large-diameter cylindrical portion 32b, and an opening 29 and a notch 29a are provided so as to face the peripheral wall of the large-diameter cylindrical portion 32b. An upper end of the valve housing 22 substantially forms a flange, and an elastic contact member 28a as a fixture for pressing the end plate 4 so that the flange contacts the step portion 34 via the annular elastic member 30. The U-shaped clip 28 provided is locked in the opening 29 and the notch 29a.

As shown in FIG. 2, the clip 28 as a fixture is formed by bending an elongated thick plate into a substantially U shape, and the bent portion 28c is brought into contact with the upper edge of the opening 29 and both ends are engaged with the notches 29a. It The width of the cutout 29a is narrower on the upper end side. Clip 2
In order to mount 8, the bent portion 28c is engaged with the opening 29, the elastic contact members 28a are pressed against the end plate 4, and the knobs 28b at both ends are brought close to each other and inserted into the notch 29a from above. . When the knob 28b is released, both ends are elastically expanded and engaged with the upper edge of the cutout 29a.

In the above configuration, when the valve body 15 is opened during operation of the cooling device, the high-pressure refrigerant liquid from the liquid receiver receives the inlet pipe 21 and the inlet 17
It flows out to the evaporator through a, the valve hole 14, the outlet chamber 23, the outlet 33, the cylindrical portion 32a, and the outlet pipe 25. In the expansion valve 1, when high-pressure refrigerant liquid rapidly flows through the valve hole 14 and expands under reduced pressure to become refrigerant gas, flow noise is generated. At this time, the valve housing 22 receives the flow noise of the refrigerant gas.
28a and the elastic members 30 and 31 are damped, so that transmission to the case 32 is suppressed. Therefore, the noise transmitted from the case 32 through the outlet pipe 25 to the evaporator in the vehicle interior is suppressed, and the vehicle interior is kept quiet.

FIG. 3 is a side sectional view showing an embodiment of a box type expansion valve as disclosed in Japanese Utility Model Laid-Open No. 62-80163. The internal structure of the expansion valve 55 is a known one, and the temperature sensing part is
44, flange 46 and inlet 59 in the middle, outlet 53 at the lower end
Are provided respectively.

The case 50 elastically supporting the expansion valve 55 is provided with a cylindrical portion 54 in the lower half portion and a cylindrical portion 58 having a larger diameter from the step portion 48 in the upper half portion, and the large diameter cylindrical portion 58 is a seal member. A lid 41 having 42a is fitted and fixed by a retaining ring 42 as a fixture so as not to come off and closed. One end 43b of the passage 43 traversing the large-diameter cylindrical portion 58 is connected to the outlet of the evaporator (not shown), and the other end 43a is connected to the suction port of the compressor.

The expansion valve 55 is fitted inside the case 50 so that a pair of upper and lower elastic members 49, which are externally inserted into the expansion valve 55 so as to sandwich the upper and lower sides of the inlet 59, elastically contact the cylindrical portion 54. . Further, the flange 46 is brought into contact with the step portion 48 via the annular elastic member 57, and the flange 46 is pressed by the retaining ring 45 fitted to the large-diameter cylindrical portion 58 via the annular elastic member 47. An inlet opening 56 communicating with the inlet 59 of the expansion valve 55 is provided in the upper portion of the cylindrical portion 54, and an outlet opening 52 communicating with the outlet 53 is provided in the lower portion.

The refrigerant compressed by the compressor is liquefied by the condenser, and the high-pressure refrigerant liquid that has passed through the receiver flows from the inlet opening 56 through the inlet 59 into the inside of the expansion valve 55, where it is decompressed and expanded to the refrigerant. It becomes gas, flows from the outlet 53 into the cylindrical portion 54 and the outlet opening 52, flows through the evaporator, and is sucked into the compressor from the end portion 43b through the passage 43 and the end portion 43a.

Also in this embodiment, when the refrigerant liquid is decompressed and expanded in the expansion valve 55 and becomes a refrigerant gas, flow noise is generated, but the expansion valve 55 that receives this flow noise is elastically elastically attached to the case 50 by the elastic members 47, 57 and 49. Since it is supported, the transmission of noise from the expansion valve 55 to the case 50 is suppressed. Therefore, the expansion valve 55 to the case 50,
The flow noise transmitted to the passenger compartment through the refrigerant pipe and the evaporator is
It will be greatly reduced.

[Advantage of the Invention] As described above, the present invention forms the flange on the upper end of the cylindrical valve housing, and the temperature sensing part on the upper part of the valve housing.
An expansion valve is formed by providing an inlet at an intermediate portion and an outlet at a lower portion, and arranging a valve body connected to a response member of the temperature sensing portion in a valve hole connecting the inlet and the outlet to form an expansion valve, and a cylindrical case. The upper part of the valve has a large-diameter cylindrical part through a step, the middle part has an inlet opening communicating with the outlet of the receiver, and the lower part has an outlet opening communicating with the inlet of the evaporator. A pair of upper and lower annular elastic members sandwiching the valve housing is externally fitted, the valve housing is fitted inside the case so that the pair of elastic members sandwich the inlet opening of the case, and the flange of the valve housing is fitted with the annular elastic member. It is mounted and supported on the stepped part of the case via the elastic member, and a fixing tool is applied to the upper surface of the flange through an elastic contacting member, and the fixing tool is locked to the large diameter cylindrical part of the case. The pair of elastic members not only fit and support the case, but also the valve. Since the end flange of the housing is clamped by the pair of upper and lower elastic members between the stepped portion of the case and the fixture locked to the case, in other words, the valve housing is elastically supported in the three axial directions with respect to the case. Therefore, the elastic member can effectively prevent the flow noise from flowing from the expansion valve to the case when the refrigerant liquid is decompressed and expanded into the refrigerant gas inside the expansion valve.

In other words, the transmission of the flow noise of the refrigerant gas generated in the expansion valve to the metal refrigerant pipe and the evaporator, which is one transmission path, is suppressed, the radiated noise into the vehicle interior is reduced, and the vehicle interior is quiet. To be kept.

The refrigerant gas that has passed through the expansion valve flows out from the valve housing to the inside of the case, so that the refrigerant passage is substantially double-covered, and the refrigerant gas, which is the other transmission passage, is passed to the evaporator. The transmitted flow noise is also reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an expansion valve for a cooling device according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side sectional view showing an expansion valve for a box type cooling device, and FIG. It is a side sectional view of an expansion valve. 1,55: Expansion valve, 14: Valve hole, 15: Valve body, 17a, 59: Inlet, 22: Valve housing, 28,45: Fixing device, 38a: Elastic contact member, 30, 31,
47,49,57: Elastic member, 32,50: Case, 32b, 58: Large diameter cylindrical part, 33,53: Exit part, 34,48: Step part, 44: Temperature sensing part, 46: Flange, 52: Exit part Opening, 56: Entrance opening

Claims (1)

[Scope of utility model registration request] 1. A valve comprising a cylindrical valve housing having a flange formed at an upper end thereof, a temperature sensing portion provided at an upper portion of the valve housing, an inlet provided at an intermediate portion, and an outlet provided at a lower portion, which connects the inlet and the outlet. An expansion valve is constructed by arranging a valve body connected to the responsive member of the temperature sensing part in the hole to form a large diameter cylindrical part through a step part in the upper part of a cylindrical case, and an outlet of the receiver in the middle part. An inlet opening communicating with the inlet of the evaporator, and an outlet opening communicating with the inlet of the evaporator are provided at the bottom, and a pair of upper and lower annular elastic members sandwiching the inlet are externally fitted to the peripheral wall of the valve housing. The valve housing is fitted inside the case so as to sandwich the inlet opening of the case, and the flange of the valve housing is placed and supported on the step portion of the case via the annular elastic member, and the elastic contact member is placed on the upper surface of the flange. A fixture and locked the fixture to the large-diameter cylindrical part of the case. Cooling device for an expansion valve, wherein the door.