JP5933210B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device capable of controlling the flow rate through an orifice.

  Conventionally, an expansion valve has been used in a refrigeration cycle of an automobile air conditioner or the like. The expansion valve has a structure in which a valve body is arranged so as to face an orifice formed by narrowing the middle of a high-pressure refrigerant passage through which a high-pressure liquid-phase refrigerant sent to the evaporator passes. The flow rate of the refrigerant passing through the orifice is controlled by opening and closing the valve body in accordance with the temperature and pressure of the low-pressure gas-phase refrigerant sent from the evaporator.

  FIG. 7 is a longitudinal sectional view showing an example of a conventional expansion valve. The expansion valve 5 includes a compressor 2 driven by the engine, a condenser (condenser) 3 connected to the discharge side of the compressor 2, a receiver 4 connected to the capacitor 3, and an evaporator (connected to the receiver 4). It is incorporated in a refrigeration cycle 1 composed of an evaporator 6, and is used for adiabatic expansion of the liquid-phase refrigerant from the receiver 4.

  In the expansion valve 5 shown in FIG. 7, the valve body 30 basically includes an orifice 32 a formed between a high-pressure side passage 32 b and a low-pressure side passage 32 c through which the high-pressure refrigerant sent to the evaporator 6 passes. A spherical valve body 8 arranged to face the refrigerant 32a from the upstream side of the refrigerant, a compression coil spring 8c as a biasing means for biasing the valve body 8 from the upstream side toward the orifice 32a, and a valve A valve support 8a for supporting the body 8 and transmitting the urging force of the compression coil spring 8c to the valve body 8, a power element portion 36 operating in accordance with the temperature of the low-pressure refrigerant sent out from the evaporator 6, and this power A power sensing element is provided between the element portion 36 and the valve body 8 and includes a temperature sensing drive unit 318 that is integrally formed with the temperature sensing rod and the operating rod and penetrates the orifice 32a. By contacting and separating with respect to the orifice 32a of the valve body 8 in accordance with the operation of section 36, controls the refrigerant flow through the orifice 32a.

  The power element portion 36 is provided with a stainless steel diaphragm 36a, which is a flexible metal thin plate, and in close contact with the diaphragm 36a. The power element portion 36 has a diaphragm 36a as one wall surface and is divided into two upper and lower portions. Stainless steel upper cover 36d and lower cover 36h constituting upper pressure working chamber 36b and lower pressure working chamber 36c as two pressure chambers respectively, and a predetermined refrigerant serving as a diaphragm driving medium in upper pressure working chamber 36b And a plug 36i that closes the hole. The lower pressure working chamber 36c communicates with the second passage 34 through which the low-pressure refrigerant from the evaporator 6 flows through the pressure equalizing hole 36e. A cylindrical mounting seat 362 is formed on the lower cover 36h, and the power element portion 36 is fixed to the valve body 30 by screwing the mounting seat 362 into the screw hole 361.

  The temperature sensitive drive unit 318 is configured as a thin rod portion 316 made of stainless steel, for example. The receiving portion 36k, which is configured separately from the rod portion 316, has a stopper portion 312 whose end abutted against the lower surface of the diaphragm 36a is enlarged in the radial direction, and a protruding portion 315 formed at the central portion. A sliding portion 314 is slidably inserted into the pressure working chamber 36c. Further, the upper end of the rod portion 316 is fitted into the projection 315 of the large diameter portion 314, and the lower end thereof is in contact with the valve body 8.

  Since the rod portion 316 constituting the temperature sensing rod passes through a through hole formed between the low pressure side flow path 32c and the second passage 34 in the valve body 30, the clearance between the through hole is formed. In order to prevent the coolant from flowing through, the O-ring 40 and the stopper member 41 that are in close contact with the outer periphery of the rod portion 316 are disposed in the large-diameter hole 38 of the through hole. The valve chamber 35 is a bottomed chamber formed coaxially with the orifice 32 a and is hermetically sealed by an O-ring 8 d disposed between the adjustment screw 8 b screwed with the valve body 30 and the valve body 30. Is held and sealed. The valve chamber 35 communicates with the high pressure side passage 32b and also communicates with the low pressure side flow path 32c through the orifice 32a.

  Furthermore, in the valve chamber 35, a compression coil spring 8c is disposed as an urging means for pressing the valve body 8 in the valve closing direction via a valve support 8a having a function of supporting the valve body 8. The upper end of the compression coil spring 8c is locked to the hook-shaped locking portion 8a1 of the valve support 8a, and the lower end is supported by the adjusting screw 8b.

  In the refrigeration cycle 1, the pressure fluctuation generated on the upstream side is transmitted to the expansion valve 5 using high-pressure liquid refrigerant as a medium, so that the operation of the valve body 8 becomes unstable, and the flow rate control of the refrigerant is performed. Inconveniences such as failure to perform accurately or noise due to vibration of the valve body 8 occur. In order to deal with such problems, a vibration isolating spring 8f that is attached to the valve support 8a and elastically contacts the side surface of the valve chamber 35 is provided to stabilize the operation of the valve body 8 and prevent vibration. . The anti-vibration spring 8f is a disc portion 8f1 of the anti-vibration spring 8f between a locking portion 8a1 formed integrally with the valve presser 8a to lock the compression coil spring 8c and the upper end of the compression coil spring 8c. Is attached to the valve support 8a by sandwiching the main body of the valve support 8a in the central hole 8f3. The anti-vibration spring 8f has a plurality of (for example, eight) spring arm portions 8f2 formed on the outer periphery thereof integrally with the disc portion 8f1, and the tip end portion of the spring arm portion 8f2 is elastic on the side surface of the valve chamber 35. Abut.

  However, the anti-vibration spring 8f as described above has a structure in which eight spring arm portions 8f2 extend in the vertical direction in the valve chamber 35. On the other hand, downsizing of the valve chamber 35 accompanying the size reduction of the valve body 30 of the expansion valve 5 is progressing. In the expansion valve including such a downsized valve chamber 35, the vibration isolating spring 8f having a long vertical dimension is provided. It is becoming difficult to secure a space for mounting the valve chamber 35 in the valve chamber 35.

Japanese Patent Laid-Open No. 2005-156046

  An object of the present invention is to reduce the size of a valve device by reducing the valve opening / closing direction dimension of the vibration-proof spring in a valve device including a vibration-proof spring that prevents vibration of a valve body that opens and closes an orifice. .

In order to solve the above-described problems, a valve device according to the present invention includes a valve body having an orifice and a valve chamber connected to the orifice, and a fluid which is disposed in the valve chamber and flows through the orifice in contact with and away from the orifice. A valve device comprising a valve body for adjusting the amount and a vibration isolating spring for preventing vibration of the valve body, wherein the valve device condenses in a condenser and is introduced into the valve chamber A temperature-type expansion valve that decompresses the phase refrigerant at the orifice and controls the opening and closing of the valve body based on the temperature of the low-pressure gas-phase refrigerant evaporated by the evaporator; A plurality of spring arm portions that elastically contact the wall surface are formed, and the plurality of spring arm portions are formed so as to extend along the wall surface of the valve chamber in a direction intersecting the opening / closing direction of the valve body. with that, the said liquid phase refrigerant It is characterized in that the port of the high-pressure flow path for introducing to the chamber is arranged at a position offset to the orifice side.

  Since the spring arm portion of the anti-vibration spring used in the present invention is formed so as to extend in the direction intersecting the opening / closing direction of the valve body along the wall surface of the valve chamber, the dimension in the opening / closing direction of the valve chamber is shortened. The size of the valve device can be shortened by downsizing the main body.

It is a perspective view which shows an example of the valve body unit (unit which consists of a valve body, a valve support body, and a vibration-proof spring) used for the valve apparatus by this invention. It is a perspective view which shows another example of the valve body unit used for the valve apparatus by this invention. It is a perspective view which shows another example of the valve body unit used for the valve apparatus by this invention. It is a perspective view which shows another example of the valve body unit used for the valve apparatus by this invention. It is a figure which fractures | ruptures and shows a part of valve apparatus provided with the valve body unit shown in FIG. It is a figure which expands and shows a part of FIG. It is a longitudinal cross-sectional view which shows an example of the conventional expansion valve.

  Hereinafter, embodiments of a valve device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of a valve body unit including a valve body, a valve support, and a vibration-proof spring used in the valve device according to the present invention. In this embodiment, parts corresponding to those in the example shown in FIG. 7 are denoted by the same reference numerals, and redundant description is omitted.

  A valve body unit 50 shown in FIG. 1 includes a valve body 58, a valve support body 51 that supports the valve body 58, and an anti-vibration spring 52. The valve support 51 has a disc-shaped valve presser 53 that supports the valve body 58 at the center of the upper surface. The anti-vibration spring 52 has a plurality of spring arm portions 54 that prevent the vibration of the valve body 58, and the spring arm portions 54 have bent portions formed respectively at a plurality of locations on the outer peripheral edge of the valve pressing portion 53. And is formed integrally with the valve pressing portion 53. The valve support 51 and the vibration-proof spring 52 are integrally formed by pressing a metal plate.

  The valve pressing portion 53 supports the valve body 58 by forming a recess in the center portion of the upper surface and fixing the valve body 58 stably seated in the recess to the recess by welding or the like. Each spring arm portion 54 of the anti-vibration spring 52 is formed in a bent state in a hook shape at a position offset from the outer peripheral edge of the valve pressing portion 53 in the opening direction of the valve body 58. In each spring arm portion 54, the lower arm portion 55 extends in the lateral direction intersecting the opening / closing direction of the valve body 58 along the side wall surface 35a of the valve chamber 35 (see FIGS. 5 and 6), and as it goes toward the tip. The valve pressing portion 53 gradually moves away from the virtual cylindrical surface having a transverse cross-sectional shape, and the smooth protruding portion 56 at the tip elastically contacts the side wall surface 35 a of the valve chamber 35. In the illustrated example, the lower arm portion 55 extends straight in the lateral direction.

  Since each spring arm portion 52 projects in the horizontal direction, the vertical arm size can be reduced while the spring arm portion of the conventional vibration-proof spring extends in the vertical direction. Further, since each spring arm portion 54 is formed integrally with the valve presser portion 53 that supports the valve body 58, the number of parts and the number of assembly steps can be reduced as compared with the conventional combination of the valve support body and the vibration isolation spring. Not only can it be reduced, but also the manufacturing cost can be reduced.

  FIG. 5 is a perspective view showing a part of the valve device in which the valve body unit 50 shown in FIG. 1 is incorporated, and FIG. 6 is an enlarged perspective view showing a part of the view shown in FIG. The valve body unit 50 is accommodated in the valve chamber 35, and a compression coil spring 8c as an urging means is interposed between the adjustment screw 8b screwed into the lower end of the valve body 30 and the valve body unit 50. Therefore, the valve body 58 is urged in the direction to close the orifice 32a by the compression coil spring 8c. The upper end portion of the compression coil spring 8 c abuts against the valve presser portion 53 of the valve support 51 from below, and the periphery thereof is surrounded by a plurality of spring arm portions 54.

  Since the spring arm portion 54 extends in the lateral direction, the valve support 51 can be disposed above the port 32b1 connected to the valve chamber 35 in the high-pressure channel 32b. Therefore, since the spring arm portion 54 does not become a resistance against the flow of the refrigerant flowing into the valve chamber 35 from the port 32b1, the pressure loss of the high-pressure refrigerant flowing in the valve chamber 35 can be further reduced, and the noise is also reduced. Can be reduced.

  FIG. 2 is a perspective view showing another example of a valve body unit used in the valve device according to the present invention. A valve body unit 60 shown in FIG. 2 is a modification of the valve body unit 50 shown in FIG. 1, and includes a spherical valve body 68, a valve support body 61 that supports the valve body 68, and a vibration isolation spring 62. It is made up. The valve support 61 includes a disc-shaped valve pressing portion 63 that supports the valve body 68 at the center of the upper surface, and a plurality of spring arm portions 64 that prevent the valve body 68 from vibrating. The anti-vibration spring 62 has a cylindrical tubular portion 65 extending from the outer peripheral edge of the valve pressing portion 63 in the opening direction of the valve body 68. The valve pressing portion 63 and the cylindrical portion 65 are integrally formed by press forming a metal plate. The spring arm portion 64 is formed by cutting and raising in the radial direction at a plurality of locations of the cylindrical portion 65. Specifically, the spring arm portion 64 is provided at a position offset from the valve presser portion 63 in the axial direction of the tubular portion 65. A protruding portion 66 is formed at the distal end portion of the spring arm portion 64, and this protruding portion 66 elastically contacts the side wall surface 35a of the valve chamber 35 (see FIG. 5).

  FIG. 3 is a perspective view showing still another example of the valve body unit used in the valve device according to the present invention. In the valve body unit 70 shown in FIG. 3, the valve body 78 is formed integrally with the valve support 71. Other than that, it is the same as the example shown in FIG. In this example, the valve body 78 is formed in a dome shape that bulges upward integrally with the valve pressing portion 72 at the central portion of the valve pressing portion 72 of the valve support 71. The shape of the valve body 78 is not limited to a dome shape, and can be formed into an appropriate shape as long as it is suitable for press molding such as a hemispherical bulged portion or a truncated cone or a truncated pyramid.

  By molding the valve body 78 integrally with the valve pressing portion 72, a step of fixing a spherical valve body manufactured separately from the valve support body as in the prior art to the valve support body by welding or the like can be omitted. .

  FIG. 4 is a perspective view showing still another example of the valve body unit used in the valve device according to the present invention. The valve body unit 80 shown in FIG. 4 is not a spherical valve body in which the valve body 88 is manufactured separately from the valve support body 81, but is formed integrally with the valve support body 81 as in the example shown in FIG. Has been. Specifically, the valve body 88 is formed in a dome shape that bulges upward integrally with the valve pressing portion 82 of the valve support 81. Moreover, since the anti-vibration spring 62 has the same structure as that of the example shown in FIG. By forming the valve body 88 integrally with the valve support 81, the step of fixing a spherical valve body manufactured separately from the valve support as in the prior art to the valve support by welding or the like can be omitted. .

In the above embodiment, the vibration isolation spring is formed integrally with the valve support. However, the present invention is not limited to this embodiment, and the valve support and the vibration isolation spring are separately formed. It is clear that it is good.
The valve device to which the present invention is applied is not limited to an expansion valve, and any valve device that has a vibration control spring that controls vibration of the valve body that controls the flow rate of the fluid passing through the orifice and the valve body may be used. It can be applied to any valve device.
In addition, various modifications can be made to the above embodiment without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Refrigerating cycle 2 Compressor 3 Condenser (condenser) 4 Receiver 8c Compression coil spring 30 Valve body 32a Orifice 32b High pressure side flow path 32b1 Port 35 Valve chamber 51, 61, 71, 81 Valve support body 53, 63, 72, 82 Valve Presser portions 52, 62 Anti-vibration springs 54, 64 Spring arm portions 58, 68, 78, 88 Valve body 65 Cylindrical portion

Claims (6)

A valve body having an orifice and a valve chamber connected to the orifice; a valve body that is disposed in the valve chamber and that adjusts the amount of fluid flowing through the orifice by contacting and leaving the orifice; and prevents vibration of the valve body A valve device comprising an anti-vibration spring,
The valve device condenses in the condenser and depressurizes the high-pressure liquid-phase refrigerant introduced into the valve chamber with the orifice, and controls the valve element based on the temperature of the low-pressure gas-phase refrigerant evaporated in the evaporator. It is a temperature type expansion valve that controls opening and closing,
The anti-vibration spring has a plurality of spring arm portions that abut against the wall surface of the valve chamber, and the plurality of spring arm portions intersects the opening / closing direction of the valve body along the wall surface of the valve chamber. A valve device characterized in that the valve device is formed so as to extend in a direction, and is disposed at a position offset toward the orifice side with respect to a port of a high-pressure side passage through which the liquid-phase refrigerant is introduced into the valve chamber.   The valve device according to claim 1, further comprising a valve support for supporting the valve body, wherein the vibration isolation spring is formed integrally with the valve support.   3. The valve device according to claim 2, wherein the spring arm portion is formed in a state of being bent in a bowl shape at a position offset in an opening direction of the valve body from an outer peripheral edge of the valve support body. The anti-vibration spring has a cylindrical portion extending from the outer peripheral edge of the valve support body in the opening direction of the valve body, and the spring arm portion has a portion of the cylindrical portion cut and raised in the radial direction. and a valve device according to claim 2, wherein Rukoto to have a shape.   A coil spring for urging the valve support in the closing direction of the valve body is provided, and one end of the coil spring is in contact with the valve support in a state surrounded by the spring arm portion. The valve device according to claim 3 or 4.   The valve device according to any one of claims 2 to 5, wherein the valve body is formed integrally with the valve support.

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