JP2013257064A - Expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion valve configured to reduce noise generated in a valve chamber to which a high pressure refrigerant is introduced.SOLUTION: An entrance passage 20 of a high pressure refrigerant provided in a valve body 10 of an expansion valve communicates with a valve chamber 30 via a minor diameter part 22. A valve body 40 is arranged to face a valve seat 42 in the valve chamber 30. The refrigerant passing an orifice 44 goes to an evaporator from an outlet passage 50. A valve support member 60 for supporting the valve body 40 is biased toward a closed valve by a coil spring 62. A spring cover member 100 for covering the coil spring 62 forms an annular refrigerant rectification passage Gbetween the inner circumferential surface of the valve chamber 30. The high pressure refrigerant introduced to the valve chamber 30 is guided to the refrigerant rectification passage Gto be rectified, thereby preventing turbulent flow, forming microbubbles in the refrigerant, and reducing noise.

Description

  The present invention relates to an expansion valve used in a refrigeration cycle.

The valve body of the expansion valve used in the refrigeration cycle has an inlet passage through which high-pressure refrigerant from the compressor is introduced, a valve chamber communicating with the inlet passage, and an orifice communicating with the valve chamber.
In the valve chamber, a valve body facing the valve seat formed at the inlet of the orifice, a coil spring for biasing the valve body toward the valve seat, and the like are disposed. The refrigerant that has passed through the gap formed between the valve body and the valve seat is depressurized by the orifice and sent out from the outlet passage to the evaporator.
The valve body has a low-pressure refrigerant passage through which low-pressure refrigerant returning from the evaporator to the compressor passes. The pressure and temperature of the low-pressure refrigerant are transmitted to a power element that is a drive device for the valve body disposed at the top of the valve body.
The power element controls the valve opening by operating the valve body in response to information received from the low-pressure refrigerant.

JP 2008-180476 A

The high-pressure refrigerant introduced into the valve chamber from the inlet passage changes the direction of flow to the valve seat while changing the flow direction to a right angle direction. As a result, the flow of the refrigerant in the valve chamber is likely to be disturbed, and the bubbles contained in the refrigerant are liable to be crushed, causing noise.
Therefore, an object of the present invention is to provide an expansion valve that eliminates the above-described problems.

  The present invention is directed to an inlet passage through which high-pressure refrigerant is introduced, a valve chamber communicating with the inlet passage, an orifice communicating with the valve chamber, and a valve seat disposed in the valve chamber and formed at the inlet of the orifice. A valve body, a coil spring that urges the valve body toward the valve seat, an outlet passage that sends the refrigerant that has passed through the orifice toward the evaporator, and a low-pressure passage through which the low-pressure refrigerant that returns from the evaporator to the compressor passes And a power element that drives the valve body in response to the pressure and temperature of the refrigerant in the low-pressure passage, in order to prevent the high-pressure refrigerant from the inlet passage toward the orifice from coming into contact with the coil spring. A spring cover member that covers the outer peripheral portion of the spring and forms a refrigerant rectifying passage between the inner peripheral surface of the valve chamber is provided.

  The spring cover member is a cylindrical member, and can be formed so that the outer peripheral portion thereof faces the entire opening portion of the inlet passage to the valve chamber.

  The expansion valve of the present invention can reduce the noise of the refrigerant flowing in the valve chamber by including the above-described means.

The front side longitudinal cross-sectional view of the expansion valve which is one Embodiment of this invention. The left longitudinal cross-sectional view of the expansion valve of FIG. 2 is a cross-sectional view of the expansion valve of FIG. 1, (a) is a cross-sectional view taken along line AA ′ of FIG. 1, (b) is a cross-sectional view taken along line BB ′ of FIG. 2, and (c) is C of FIG. -C 'sectional view taken on the line. The principal part enlarged view of FIG.

  As shown in FIGS. 1 to 3, the expansion valve 1 of the present embodiment has a prismatic valve body 10, and an inlet passage 20 for high-pressure refrigerant is provided near the bottom of the valve body 10. The inlet passage 20 is formed in a multistage shape whose diameter gradually decreases toward the back, and communicates with the valve chamber 30 via the innermost small diameter portion 22. The upper end of the valve chamber 30 communicates with the orifice 44, and a valve seat 42 is formed on the inlet side.

  A valve body 40 is disposed in the valve chamber 30, and the valve body 40 forms a valve portion in cooperation with the valve seat 42. The high-pressure refrigerant that has passed through the gap formed between the valve body 40 and the valve seat 42 flows into the outlet passage 50 through the orifice 44 and is sent to the evaporator through a pipe (not shown). The inlet passage 20 and the outlet passage 50 are formed so that their axes are orthogonal to each other, and the high-pressure refrigerant flowing from the condenser into the valve body 10 via the inlet passage 20 is formed in an L shape in the valve body 10. To the evaporator via the outlet passage 50.

  The valve body 40 is supported by a valve support member 60 disposed in the valve chamber 30, and the valve support member 60 is always urged in the valve closing direction by a coil spring 62. The coil spring 62 is supported by a plug 64 that seals the lower end opening of the valve chamber 30, and by adjusting the screwing amount of the plug 64, the compression amount of the coil spring 62 is changed and the valve closing direction to the valve body 40 is changed. Adjust the urging force. Further, the valve chamber 30 is sealed by a seal ring 66 attached to the outer periphery of the upper end of the plug 64.

A spring cover member 100 that covers the coil spring 62 is disposed outside the coil spring 62. The spring cover member 100 is a cylindrical member formed by pressing a metal plate, and the outer diameter of the spring cover member 100 is smaller than the inner diameter of the valve chamber 30. Between the surface and the inner peripheral surface of the valve chamber 30, a refrigerant rectifying passage G <b> ₁ having an annular gap is formed. The lower end portion 102 of the spring cover member 100 extends to the plug 64 side from the lowermost portion of the small diameter portion 22, and the outer peripheral surface of the spring cover member 100 faces the entire opening portion of the small diameter portion 22 to the valve chamber 30. Yes.

  The low-pressure refrigerant returning from the evaporator to the compressor enters the low-pressure refrigerant inlet port 70 provided in the upper part of the valve body 10 and returns to the compressor via the outlet port 72. As shown in FIG. 3C, the inlet port 70 and the outlet port 72 are formed so that their axes are orthogonal to each other, and the low-pressure refrigerant that flows into the valve body 10 from the evaporator via the inlet port 70. Flows in an L-shape in the valve body 10 and returns to the compressor via the outlet port 72.

As shown in FIG. 1, a power element 80 is mounted on the top of the valve body 10. The power element 80 has a diaphragm 83 sandwiched between an upper lid 81 and a lower lid 82, and an upper pressure working chamber 84 is formed between the upper lid 81 and the diaphragm 83.
A working gas is sealed in the upper pressure working chamber 84, and the diaphragm 83 is displaced according to the pressure and temperature of the low-pressure refrigerant introduced into the lower pressure working chamber 85.
The power element 80 is covered with a cover 88 to prevent the influence of external temperature on the working gas.

The displacement of the diaphragm 83 is transmitted to the operating rod 92 via the receiving member 90, and the operating rod 92 drives the valve body 40 to control the valve opening.
The operating rod 92 is elastically supported by a ring-shaped vibration-proof spring member 93 mounted in a recess 10 a formed in the valve body 10. The anti-vibration spring member 93 is fitted on the operating rod 92 and suppresses the radial movement while allowing the axial movement of the operating rod 92. Thereby, generation | occurrence | production of the noise accompanying the pressure fluctuation of a high pressure refrigerant | coolant is prevented.

In FIG. 4, the high-pressure refrigerant introduced into the inlet passage 20 flows into the valve chamber 30 through the small diameter portion 22. Then, it is guided to the refrigerant rectifying passage G ₁ formed by the outer peripheral surface of the spring cover member 100 having a smooth surface and the inner peripheral surface of the valve chamber 30 in contact with the outer peripheral surface of the spring cover member 100 and heading toward the orifice 44. . Since the refrigerant passing through the refrigerant rectifying passage G ₁ is formed between the inner circumferential surface of the outer peripheral surface and the valve chamber 30 is a smooth surface of the cover member 100 is a smooth surface is rectified, not become turbulent. Moreover, air bubbles contained in the high-pressure refrigerant is subdivided by the refrigerant rectifying passage G _1. This action reduces noise generated in the valve chamber 30 by the high-pressure refrigerant.

Expansion valve of the present invention, as described above, the spring cover forming a valve chamber 30 which flows high-pressure refrigerant, the refrigerant rectifying passage G ₁ between the inner peripheral surface of the valve chamber 30 covers the coil spring 62 Since the member 100 is provided, the flow of the refrigerant is smooth, turbulence is not generated, and the bubbles are subdivided, so that noise is reduced.

DESCRIPTION OF SYMBOLS 1 Expansion valve 10 Valve main body 20 Inlet passage 22 Small diameter part 30 Valve chamber 40 Valve body 42 Valve seat 44 Orifice 50 Outlet passage 60 Valve support member 62 Coil spring 64 Plug 66 Seal ring 70 Inlet port 72 Outlet port 80 Power element 81 Upper lid 82 Lower lid 83 Diaphragm 84 Upper pressure working chamber 85 Lower pressure working chamber 90 Receiving member 92 Actuating rod 100 Spring cover member G ₁ Refrigerant rectifying passage

Claims (2)

An inlet passage through which high-pressure refrigerant is introduced, a valve chamber communicating with the inlet passage, an orifice communicating with the valve chamber, and a valve seat disposed in the valve chamber and formed at the inlet of the orifice A valve body, a coil spring that urges the valve body toward the valve seat, an outlet passage for sending the refrigerant that has passed through the orifice toward the evaporator, and a low-pressure refrigerant that returns from the evaporator to the compressor. An expansion valve comprising: a low-pressure passage, and a power element that drives the valve body in response to the pressure and temperature of the refrigerant in the low-pressure passage,
A spring cover that covers the outer peripheral portion of the coil spring and forms a refrigerant rectifying passage with the inner peripheral surface of the valve chamber in order to prevent high-pressure refrigerant from the inlet passage toward the orifice from coming into contact with the coil spring. An expansion valve comprising a member.   2. The expansion valve according to claim 1, wherein the spring cover member is a cylindrical member, and an outer peripheral portion thereof is formed so as to face the entire surface of the opening portion of the inlet passage to the valve chamber. .

Images