JP2020060308A - Expansion valve - Google Patents

Abstract

To suppress the transmission of vibration from an expansion valve to an object member to be mounted.SOLUTION: The expansion valve includes a metal body part 51 formed with a refrigerant passage 50b in which refrigerant for a vapor compression type refrigeration cycle device 10 is depressurized with a reduction of the passage cross section area, and avoiding members 91, 81, 92, 93 for avoiding metallic contact between the body part 51 and a metal object member to be mounted 100 on which the body part 51 is mounted. Accordingly, even when the body part 51 vibrates with a jet at the time of depressurizing the refrigerant in the refrigerant passage 50b, the transmission of the vibration from the body part 51 to a joint 100 can be suppressed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an expansion valve that exerts a pressure reducing action on a refrigerant of a refrigeration cycle device.

  BACKGROUND ART Conventionally, Patent Document 1 describes an expansion valve fixed to a joint block by bolt fastening.

  In this prior art, the expansion valve has an aluminum body. Joint blocks and bolts are generally made of metal.

JP, 2010-116939, A

  The expansion valve vibrates due to the jet flow when decompressing the refrigerant. However, in the above-mentioned conventional technique, since the expansion valve and the joint block are in metal contact with each other via the bolt, the vibration of the expansion valve is transmitted to the joint block, and thus the vibration is transmitted to the evaporator of the refrigeration cycle apparatus to evaporate. Radiant sound may be emitted from the vessel.

  In view of the above points, the present invention has an object to suppress the vibration of the expansion valve from being transmitted to the attachment target member.

In order to achieve the above object, the expansion valve according to claim 1,
A metal body part (51) in which a refrigerant passage (50b) is formed to reduce the pressure of the refrigerant of the vapor compression refrigeration cycle device (10) by reducing the passage sectional area.
The body part (51) and the avoidance member (91, 81, 92, 93) for avoiding metal contact between the body-attached member (100) to which the body part (51) is attached are provided.

  According to this, even if the body portion (51) vibrates due to the jet flow when decompressing the refrigerant in the refrigerant passage (50b), it is possible to suppress the vibration of the body portion (51) from being transmitted to the joint (100).

  It should be noted that the reference numerals in parentheses for each means described in this column and in the claims indicate the correspondence with the specific means described in the embodiments described later.

It is a front view showing an expansion valve in a 1st embodiment. It is a figure which shows the II-II cross section of FIG. 1, and the whole refrigerating-cycle apparatus structure. It is a III section enlarged view of FIG. FIG. 4 is an enlarged view of an IV section in FIG. It is sectional drawing which shows the expansion valve in 2nd Embodiment. It is sectional drawing which shows the expansion valve in 3rd Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In each of the following embodiments, the same or equivalent portions are denoted by the same reference numerals in the drawings.

(First embodiment)
The expansion valve 5 shown in FIG. 1 is applied to the refrigeration cycle device 1 shown in FIG. The refrigeration cycle device 1 is a vapor compression refrigeration cycle device used in an air conditioner. The refrigeration cycle device 1 is configured by connecting a compressor 2, a radiator 3, a receiver 4, an expansion valve 5, and an evaporator 6 in an annular shape.

  The compressor 2 draws in the low-pressure refrigerant, compresses it until it becomes high-pressure refrigerant, and discharges it. The radiator 3 is a heat radiating heat exchanger that heat-exchanges the high-pressure refrigerant discharged from the compressor 2 with the outside air to radiate the high-pressure refrigerant and condense it. The receiver 4 is a liquid receiver that separates the gas-liquid refrigerant that has flowed out from the radiator 3 and stores the excess liquid refrigerant of the cycle.

  The expansion valve 5 is a decompression device that decompresses the high-pressure refrigerant flowing out from the receiver 4 until it becomes a low-pressure refrigerant. The evaporator 6 exchanges heat between the low-pressure refrigerant decompressed by the expansion valve 5 and the air blown to the air-conditioned space, evaporates the low-pressure liquid refrigerant, and exerts an endothermic action. Is.

  The refrigeration cycle apparatus 1 employs an HFC-based refrigerant (specifically, R134a) as the refrigerant, and a vapor compression subcritical pressure in which the pressure of the discharged refrigerant discharged from the compressor 11 does not exceed the critical pressure of the refrigerant. It constitutes a refrigeration cycle. Refrigerating machine oil for lubricating the compressor 11 is mixed in the refrigerant, and a part of the refrigerating machine oil circulates in the cycle together with the refrigerant.

  The expansion valve 5 includes a body portion 51, a valve body portion 52, an element portion 53 and the like. The expansion valve 5 is formed as a so-called box-type temperature expansion valve.

  The box-type thermal expansion valve is an expansion valve in which a low-pressure refrigerant passage 50a is formed inside the body portion 51. The low-pressure refrigerant passage 50a is a refrigerant passage for detecting the temperature and pressure of the low-pressure refrigerant, and allows the low-pressure refrigerant flowing out of the evaporator 6 to flow therethrough.

  A throttle passage 50b and a valve chamber 50c are formed inside the body portion 51. The throttle passage 50b is a refrigerant passage that functions as an orifice for reducing the pressure of the high-pressure refrigerant flowing out from the receiver 4 to a low-pressure refrigerant by reducing the passage cross-sectional area of the refrigerant passage.

  The valve chamber 50c is a space which is arranged on the upstream side of the refrigerant flow in the throttle passage 50b and accommodates the valve body portion 52. The valve body 52 is a spherical valve. The displacement of the valve body 52 changes the passage cross-sectional area of the throttle passage 50b.

  A coil spring 52a is housed inside the valve chamber 50c. The coil spring 52a is an elastic member that applies a load to the valve body 52 on the side that reduces the passage cross-sectional area of the throttle passage 50b.

  The body portion 51 has a substantially rectangular parallelepiped shape. A high pressure side inlet 51a, an evaporator side outlet 51b, a low pressure side inlet 52a, and a compressor side outlet 52b are opened on the outer surface of the body portion 51.

  The high-pressure side inlet 51a allows the high-pressure refrigerant flowing out of the receiver 4 to flow into the valve chamber 50c. The evaporator-side outlet 51b allows the low-pressure refrigerant decompressed in the throttle passage 50b to flow out. The low pressure side inlet 52a allows the low pressure refrigerant flowing out of the evaporator 6 to flow into the low pressure refrigerant passage 50a. The compressor-side outlet 52b causes the low-pressure refrigerant flowing through the low-pressure refrigerant passage 50a to flow out to the suction side of the compressor 11.

  The evaporator side outlet 51b and the low pressure side inlet 52a are open on the same surface of the body portion 51 (the surface on the right side in FIG. 2). The high-pressure side inlet 51a and the compressor-side outlet 52b are surfaces of the body portion 51 opposite to the surface where the evaporator-side outlet 51b and the low-pressure side inlet 52a are open (in FIG. 2, the left side surface). It is open to.

  The element portion 53 outputs a driving force for displacing the valve body portion 52. The element portion 53 has a diaphragm (not shown). The diaphragm is made of a thin plate metal and deforms according to the temperature and pressure of the low-pressure refrigerant flowing through the low-pressure refrigerant passage 50a.

  An operating rod 54 is connected to the diaphragm. The actuation rod 54 transmits the displacement due to the deformation of the diaphragm to the valve body portion 52 and displaces the valve body portion 52.

  The expansion valve 5 is fixed to the joint 100. The joint 100 is an attachment target member to which the body portion 51 of the expansion valve 5 is attached. The joint 100 is made of metal (aluminum in this example) and has a thick plate shape. The joint 100 is arranged so as to overlap the surface of the expansion valve 5 where the evaporator-side outlet 51b and the low-pressure side inlet 52a are open.

  An inflow side pipe 71 and an outflow side pipe 72 are joined to the joint 100. For example, the inflow side pipe 71 and the outflow side pipe 72 are brazed to the joint 100.

  The inflow side pipe 71 is a refrigerant pipe that connects the outflow side of the evaporator 6 and the low pressure side inlet 52a of the expansion valve 5 to allow the low pressure refrigerant flowing out of the evaporator 6 to flow into the low pressure refrigerant passage 50a. The outflow side pipe 72 is a refrigerant pipe that connects the evaporator side outlet 51b of the expansion valve 5 and the inflow side of the evaporator 6 to allow the low pressure refrigerant decompressed in the throttle passage 50b to flow into the evaporator 6.

  The joint 100 has a first insertion portion 101 and a second insertion portion 102. The first insertion portion 101 is inserted into the low pressure side inlet 52a. The second insertion portion 102 is inserted into the evaporator side outlet 51b.

  The outer diameter of the first insertion portion 101 is slightly smaller than the inner diameter of the evaporator-side outlet 51b. Therefore, a gap is formed between the outer peripheral surface of the first insertion portion 101 and the inner peripheral surface of the evaporator-side outlet 51b.

  The inner diameter of the second insertion portion 102 is slightly smaller than the inner diameter of the low pressure side inlet 52a. Therefore, a gap is formed between the outer peripheral surface of the second insertion portion 102 and the inner peripheral surface of the low pressure side inlet 52a.

  A seal member 73 is arranged on the first insertion portion 101 and the second insertion portion 102. The seal member 73 is made of an elastically deformable material. In this embodiment, a rubber O-ring is used as the seal member 73. The seal member 73 is made of rubber such as nitrile rubber or ethylene propylene rubber.

  In the present embodiment, the seal member 73 is arranged in the circumferential groove formed on the outer peripheral surfaces of the first insertion portion 101 and the second insertion portion 102.

  The seal member 73 disposed in the first insertion portion 101 seals between the first insertion portion 101 and the inner peripheral surface of the low pressure side inlet 52a, and the inner peripheral surface of the first insertion portion 101 and the low pressure side inlet 52a. The refrigerant is prevented from leaking through the gap between the.

  The seal member 73 arranged in the second insertion portion 102 seals between the second insertion portion 102 and the inner peripheral surface of the evaporator-side outlet 51b so that the inside of the second insertion portion 102 and the evaporator-side outlet 51b is sealed. The refrigerant is prevented from leaking through the gap with the peripheral surface.

  The joint 100 is in contact with the body portion 51 via the seal member 73 in the first insertion portion 101 and the second insertion portion 102. That is, the body portion 51 is not in metal contact with the first insertion portion 101 and the second insertion portion 102 of the joint 100.

  The joint 100 is fastened and fixed to the body portion 51 by a bolt 81 which is a fastening member. The bolt 81 is made of metal (aluminum in this example).

  The body portion 51 of the expansion valve 5 has a bolt hole 51c and a spot facing portion 51d. The bolt hole 51c penetrates the body portion 51 from the opposite side of the joint 100 toward the joint 100 side. The cylinder portion 81a of the bolt 81 is inserted into the bolt hole 51c.

  The counterbore 51d is formed to prevent the head 81b of the bolt 81 from protruding from the surface of the body 51. The spot facing 51d is formed on the surface of the body 51 opposite to the joint 100.

  The bolt 81 is inserted into the bolt hole 51c from the opposite side of the joint 100 toward the joint 100 side. That is, in the bolt 81, the head portion 81b faces the opposite side of the joint 100, and the male screw portion 81c faces the joint 100 side.

  A female screw hole 103 is formed in the joint 100. The male screw portion 81c of the bolt 81 is fastened to the female screw hole 103.

  Vibration transmission suppressing members 91 are inserted at both ends of the bolt hole 51c. The vibration transmission suppressing member 91 is an avoiding member that avoids metal contact between the body portion 51 and the joint 100.

  The first vibration transmission suppressing member 91 is inserted into the bolt hole 51c from the counterbore 51d side. The second vibration transmission suppressing member 91 is inserted into the bolt hole 51c from the joint 100 side.

  As shown in FIGS. 3 and 4, the vibration transmission suppressing member 91 has a flanged cylindrical shape. The vibration transmission suppressing member 91 has a cylindrical shape with a collar. The vibration transmission suppressing member 91 has a cylindrical portion 91a and a flange portion 91b. The flange portion 91b extends from one end of the cylindrical portion 91a to the radially outer side of the cylindrical portion 91a in a flange shape (in other words, a disk shape).

  The vibration transmission suppressing member 91 is inserted into the bolt hole 51c from the end portion on the side opposite to the flange portion 91b.

  The vibration transmission suppressing member 91 is formed of a material having a lower vibration transmission property than the body portion 51 and the joint 100. In the present embodiment, the vibration transmission suppressing member 91 is made of rubber. For example, the vibration transmission suppressing member 91 is made of rubber such as nitrile rubber or ethylene propylene rubber.

  The vibration transmission suppressing member 91 may be made of resin. For example, the vibration transmission suppressing member 91 is made of a resin such as polycarbonate or polypropylene.

  In the first vibration transmission suppressing member 91, the cylindrical portion 91a is sandwiched between the cylindrical portion 81a of the bolt 81 and the body portion 51 in the bolt hole 51c, and the flange portion 91b is located at the counterbore portion 51d and the head portion 81b of the bolt 81 is formed. And the body portion 51.

  In the second vibration transmission suppressing member 91, the cylindrical portion 91a is sandwiched between the cylindrical portion 81a of the bolt 81 and the body portion 51 in the bolt hole 51c, and the flange portion 91b is sandwiched between the body portion 51 and the joint 100. Be done.

  As a result, metal contact between the body portion 51 and the bolt 81 is avoided. Furthermore, since a gap is formed between the body portion 51 and the joint 100, metal contact between the body portion 51 and the joint 100 is avoided.

  Next, the function and effect of the above configuration will be described. When the compressor 2 of the refrigeration cycle device 1 is activated, the refrigerant discharged from the compressor 2 circulates through the radiator 3, the receiver 4, the expansion valve 5, and the evaporator 6.

  The high-pressure refrigerant flowing out from the receiver 4 is decompressed by the expansion valve 5 until it becomes a low-pressure refrigerant. At this time, the body portion 51 of the expansion valve 5 vibrates due to the jet flow when decompressing the refrigerant in the throttle passage 50b.

  In the expansion valve 5, the metal contact between the body portion 51 and the joint 100 is avoided by the two vibration transmission suppressing members 91, so that the vibration of the body portion 51 can be suppressed from being transmitted to the joint 100.

  Therefore, it is possible to suppress the vibration of the body portion 51 from being transmitted to the evaporator 6 of the refrigeration cycle apparatus 1 via the joint 100, the inflow side pipe 71, and the outflow side pipe 72, and thus the emission sound from the evaporator 6 is generated. Can be suppressed.

  Since the physical structures of the expansion valve 5 and the joint 100 do not substantially change even if the two vibration transmission suppressing members 91 are arranged, the expansion valve 5 and the joint 100 can be mounted on the vehicle with substantially the same mountability to the evaporator 6. Generation of radiated sound can be suppressed.

  Furthermore, heat transfer from the evaporator 6 to the expansion valve 5 can be suppressed by eliminating the metallic contact between the evaporator 6 and the expansion valve 5. Therefore, it is possible to prevent the element portion 53 of the expansion valve 5 from being cooled by the cold heat of the evaporator 6, so that the diaphragm of the element portion 53 is appropriately deformed according to the temperature and pressure of the low-pressure refrigerant flowing through the low-pressure refrigerant passage 50a. can do. Therefore, the opening degree of the throttle passage 50b can be appropriately controlled according to the degree of superheat of the low pressure refrigerant flowing through the low pressure refrigerant passage 50a.

  In the present embodiment, the vibration transmission suppressing member 91 avoids metal contact between the metal body portion 51 and the metal joint 100. According to this, even if the body portion 51 vibrates due to the jet flow when decompressing the refrigerant in the refrigerant passage 50b, it is possible to suppress the vibration of the body portion 51 from being transmitted to the joint 100.

  In the present embodiment, the vibration transmission suppressing member 91 avoids metal contact between the bolt 81 and the body portion 51, and avoids metal contact between the body portion 51 and the joint 100. Accordingly, it is possible to reliably suppress the vibration of the body portion 51 from being transmitted to the joint 100.

  In the present embodiment, the vibration transmission suppressing member 91 has a flanged cylindrical shape having a cylindrical portion 91a into which the bolt 81 is inserted and a flange portion 91b protruding from the cylindrical portion 91a.

  Accordingly, the simple vibration transmission suppressing member 91 can reliably prevent the vibration of the body portion 51 from being transmitted to the joint 100.

  In the present embodiment, in the bolt 81, the head portion 81b faces the opposite side of the joint 100, the male screw portion 81c faces the joint 100 side, and the vibration transmission suppressing member 91 and the head portion 81b side of the bolt 81, A pair of bolts 81 are arranged on the male screw portion 81c side.

  Thereby, it is possible to more reliably suppress the vibration of the body portion 51 from being transmitted to the joint 100.

  In the present embodiment, the flange portion 91b of the vibration transmission suppressing member 91 arranged on the head 81b side of the bolt 81 is sandwiched between the body portion 51 and the head 81b of the bolt 81. As a result, it is possible to reliably avoid metal contact between the bolt 81 and the body portion 51.

  In the present embodiment, the flange portion 91b of the vibration transmission suppressing member 91 arranged on the male screw portion 81c side is sandwiched between the body portion 51 and the joint 100, and between the body portion 51 and the joint 100. Forming a gap. As a result, it is possible to reliably avoid metal contact between the body portion 51 and the joint 100.

  In this embodiment, the vibration transmission suppressing member 91 is sandwiched between the body portion 51 and the joint 100. Thereby, a gap can be reliably formed between the body portion 51 and the joint 100.

  In the present embodiment, the throttle passage 50b is connected to the refrigerant pipe 72 via the joint 100. Thereby, the vibration of the body portion 51 can be suppressed from being transmitted to the refrigerant pipe 72.

(Second embodiment)
In the above embodiment, the rubber vibration transmission suppressing member 91 and the vibration transmission suppressing member 91 are used to avoid the metal contact between the body portion 51 and the bolt 81, but in the present embodiment, it is shown in FIG. As described above, the vibration transmission suppressing member 91 is eliminated by making the bolt 81 and the washer 92 made of resin.

  For example, the bolt 81 and the washer 92 are made of resin such as polycarbonate or polypropylene. The bolt 81 and the washer 92 may be made of a material having lower vibration transmissibility than the body portion 51 and the joint 100.

  A bolt 81 is inserted in the washer 92. The washer 92 is sandwiched between the body portion 51 and the joint 100. As a result, a gap is formed between the body portion 51 and the joint 100 in the longitudinal direction of the bolt 81.

  With the above configuration, metal contact between the body portion 51 and the joint 100 is avoided. Therefore, the same effect as that of the above embodiment can be obtained.

  In the present embodiment, in the bolt 81, the head portion 81b faces the opposite side of the joint 100, the male screw portion 81c faces the joint 100 side and is inserted into the bolt hole 51c, and the washer 92 joins the body portion 51 and the joint portion. 100 and a gap is formed between the body portion 51 and the joint 100, and the bolt 81 and the washer 92 are made of a material having lower vibration transmissibility than the body portion 51 and the joint 100. Has been done.

  As a result, the same operational effects as those of the above embodiment can be obtained.

  In the present embodiment, the washer 92 is sandwiched between the body portion 51 and the joint 100. As a result, it is possible to reliably avoid metal contact between the body portion 51 and the joint 100.

(Third Embodiment)
In the first embodiment, the collar portion 91b of the vibration transmission suppressing member 91 is sandwiched between the body portion 51 and the joint 100, so that a gap is formed between the body portion 51 and the joint 100. In the present embodiment, as shown in FIG. 6, a plate-shaped vibration transmission suppressing member 93 is sandwiched between the body portion 51 and the joint 100, so that a gap is formed between the body portion 51 and the joint 100. ing.

  The plate-shaped vibration transmission suppressing member 93 is formed of a material having lower vibration transmission properties than the body portion 51 and the joint 100. In the present embodiment, the plate-shaped vibration transmission suppressing member 93 is made of resin such as polycarbonate or polypropylene. The plate-shaped vibration transmission suppressing member 93 has a rectangular plate shape that overlaps the entire surface of the body portion 51 where the evaporator-side outlet 51b and the low-pressure side inlet 52a are open.

  The plate-shaped vibration transmission suppressing member 93 is formed with through holes corresponding to the evaporator side outlet 51b of the body portion 51, the low pressure side inlet 52a, and the bolt hole 51c.

  In the present embodiment, similarly to the first embodiment, a cylindrical vibration transmission suppressing member 91 with a collar is arranged on the head 81b side of the bolt 81.

  With the above configuration, metal contact between the body portion 51 and the joint 100 is avoided. Therefore, the same effect as that of the above embodiment can be obtained.

  In this embodiment, the plate-shaped vibration transmission suppressing member 93 is sandwiched between the body portion 51 and the joint 100. As a result, it is possible to reliably avoid metal contact between the body portion 51 and the joint 100.

  In the present embodiment, the vibration transmission suppressing member 93 is a flat plate-shaped member that overlaps the entire portion of the body portion 51 facing the joint 100. As a result, it is possible to reliably avoid metal contact between the body portion 51 and the joint 100.

(Other embodiments)
The above embodiments can be combined as appropriate. The above embodiment can be variously modified as follows, for example.

  (1) In the above embodiment, the refrigerant of the refrigeration cycle device 1 is an HFC-based refrigerant (specifically, R134a), but the refrigerant is not limited to this. For example, R1234yf, R600a, R410A, R404A, R32, R407C, etc. may be adopted. Alternatively, a mixed refrigerant in which a plurality of kinds of these refrigerants are mixed may be adopted.

  (2) In the above embodiment, the expansion valve 5 is a thermal expansion valve, but the expansion valve 5 may be an electric expansion valve. The electric expansion valve is an electric variable throttle device having a valve body and an electric actuator.

10 Refrigeration cycle device 50b Throttle passage (refrigerant passage)
51 Body part 51c Bolt hole 81 Bolt 81b Head part 81c Male screw part 91 Vibration transmission suppressing member (avoiding member)
91a Cylindrical part 91b Collar part 100 Joint (attachment target member)

Claims (11)

A metal body part (51) in which a refrigerant passage (50b) is formed to reduce the pressure of the refrigerant of the vapor compression refrigeration cycle device (10) by reducing the passage sectional area.
An expansion valve provided with an avoidance member (91, 81, 92, 93) for avoiding metal contact between the body portion and a metal attachment target member (100) to which the body portion is attached. A bolt (81) for fastening and fixing the body portion to the attachment target member,
A bolt hole (51c) into which the bolt is inserted is formed in the body portion,
The expansion valve according to claim 1, wherein the avoiding member avoids metal contact between the bolt and the body portion, and avoids metal contact between the body portion and the attachment target member.   The avoiding member has a flanged cylindrical shape having a cylindrical cylindrical portion (91a) into which the bolt is inserted, and a flange portion (91b) projecting radially outward from the cylindrical portion in a flange shape. The expansion valve according to claim 2. The head portion (81b) of the bolt faces the opposite side of the attachment target member, and the male screw portion (81c) faces the attachment target member side,
The expansion valve according to claim 3, wherein the avoidance members are arranged in pairs on the head side and the male screw side.   The expansion valve according to claim 4, wherein the collar portion of the avoidance member arranged on the head side is sandwiched between the body portion and the head portion.   The collar portion of the avoiding member arranged on the male screw portion side is sandwiched between the body portion and the attachment target member, and forms a gap between the body portion and the attachment target member. The expansion valve according to claim 4 or 5. The avoidance member has a bolt (81) for fastening and fixing the body portion to the attachment target member, and a washer (92) into which the bolt is inserted,
A bolt hole (51c) into which the bolt is inserted is formed in the body portion,
In the bolt, the head portion (81b) of the bolt faces the opposite side of the attachment target member, and the male screw portion (81c) of the bolt faces the attachment target member side and is inserted into the bolt hole,
The washer is sandwiched between the body portion and the attachment target member to form a gap between the body portion and the attachment target member,
The expansion valve according to claim 1 or 2, wherein the bolt and the washer are made of a material having lower vibration transmissibility than the body portion and the attachment target member.   The expansion valve according to claim 1, wherein the avoidance member is sandwiched between the body portion and the attachment target member.   The expansion valve according to claim 8, wherein the avoiding member is a flat plate-like member that overlaps the entire portion of the body portion that faces the attachment target member.   The expansion valve according to any one of claims 1 to 9, wherein the refrigerant passage is connected to a refrigerant pipe (72) through which the refrigerant flows through the attachment target member.   The expansion valve according to claim 1, wherein the avoidance member is formed of rubber or resin.

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