JP5991802B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device capable of controlling the flow rate of fluid flowing 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 disposed so as to face the orifice formed by narrowing the middle of the high-pressure refrigerant passage through which the high-pressure liquid phase refrigerant sent to the evaporator passes, from the upstream side, 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 refrigerant 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 passage 32c through the orifice 32a.

  Further, in the valve chamber 35, a compression coil spring 8c is arranged as a biasing means for biasing the valve body 8 in the valve closing direction via a valve support body 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 of the anti-vibration spring 8f between a locking portion 8a1 formed integrally with the valve support 8a to lock the compression coil spring 8c and the upper end of the compression coil spring 8c. 8f1 is attached to the valve support 8a by sandwiching 8f1 with the body portion of the valve support 8a inserted 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.

  In the expansion valve having the above-described structure, the valve support 8a is in resistance to the flow of the refrigerant toward the orifice 32a, causing a pressure loss and when the refrigerant passes around the valve support 8a. Noise may be generated.

Japanese Patent Laid-Open No. 2005-156046

  An object of the present invention is to reduce a pressure loss of a fluid in a valve device including a valve support that supports a valve body that opens and closes an orifice, by reducing resistance to a flow of fluid that flows into the valve chamber and toward the orifice. The object is to reduce the noise generated when the fluid passes around the valve support.

In order to solve the above 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 an amount of fluid that is disposed in the valve chamber and flows through the orifice in contact with and away from the orifice. The valve device includes a valve body that adjusts the valve body and a valve support that supports the valve body, and the valve device condenses a high-pressure liquid-phase refrigerant that is condensed in a condenser and introduced into the valve chamber. A temperature-type expansion valve that decompresses 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, and introduces the liquid-phase refrigerant into the valve chamber. port of the high pressure side flow path, the orifice and is connected from the direction toward and away from intersecting the direction of said valve body, said valve support body-out hole or notch for passing the fluid is provided to Rutotomoni, the valve Support in front of the valve chamber It is characterized by being disposed on the orifice side to the port of the high-pressure channel.

  The valve device according to the present invention is provided with a hole or a notch for allowing fluid to pass through the valve support, so that a part of the fluid flowing into the valve chamber is not blocked by the valve support. It can flow toward the orifice through the notch. Therefore, the pressure loss of the fluid is reduced, and the noise generated when the fluid passes through the valve support can be reduced.

It is a perspective view which shows an example of the valve body unit (unit of a valve body, a vibration proof spring, and a valve support body) 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 perspective view which fractures | ruptures and shows a part of valve apparatus provided with the valve body unit shown in FIG. It is a perspective view 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 that integrates a valve body used in a valve device according to the present invention, a valve support body that supports the valve body, and a vibration-proof spring that prevents vibration of the valve body. . In this embodiment, the structure other than the valve body unit is the same as that of the expansion valve shown in FIG. Moreover, in FIG. 1, for simplification, a part of the reference numerals are limited.

  The valve body unit 50 shown in FIG. 1 includes a valve body 58 and a valve support body 51 that supports the valve body 58. The valve support 51 is formed integrally with a disc-shaped valve support 51a that supports the valve body 58 at the center of the upper surface, and a vibration-proof spring 51b that prevents vibration of the valve body 58. The anti-vibration springs 51b are provided via bent portions 53 respectively formed at a plurality of locations on the outer peripheral edge 51c of the valve support portion 51a (in this example, four locations around the center of the valve support portion 51a at equal angles). It consists of a plurality of spring arms 52 connected together. The valve support 51a and the vibration-proof spring 51b can be formed by pressing a metal plate.

  The valve support portion 51a supports the valve body 58 by forming a recess 59 in the central portion of the upper surface and fixing the valve body 58 stably seated in the recess 59 to the recess 59 by welding or the like. Each spring arm portion 52 of the anti-vibration spring 51b is formed in a substantially L shape that is bent at a right angle to the surface of the valve support portion 51a and hangs downward. In each spring arm portion 52, the upper arm portion 54 connected to the bent portion 53 is a flat portion or a portion of a cylinder and slightly curved. Further, since the lower arm portion 55 connected to the upper arm portion 54 via the elbow portion 57 extends in the lateral direction, it gradually moves away from the virtual cylindrical surface having the valve support portion 51a having a transverse cross-sectional shape toward the tip. As a result, a smooth protruding portion 56 at the tip is in contact with the inner wall of the valve chamber 35 (see FIG. 5) with elasticity. In the illustrated example, the lower arm portion 55 extends straight in the lateral direction.

  Since each spring arm 52 projects laterally on the virtual cylindrical surface described above, the spring piece of the conventional vibration-proof spring extends in the vertical direction, whereas the vertical dimension can be reduced. . In addition, each spring arm portion 52 is formed integrally with the valve support portion 51a that supports the valve body 58, so that the number of parts and the number of assembly steps are reduced as compared with the conventional combination of the valve support body and the vibration-proof spring. Not only can it be reduced, but also the manufacturing cost can be reduced.

  In the valve support portion 51a, a plurality of coolant passage holes 72 (only a part thereof are denoted by reference numerals) are formed at appropriate intervals in the circumferential direction around the central portion that supports the valve body 58. . The intervals between the holes 72 are preferably formed at equal intervals from the viewpoint of the uniformity of the refrigerant flow around the valve body 58. The hole 72 conventionally flows only smoothly from the valve chamber 35 to the orifice 32a through the valve support 51 and passes through the valve support 51 to the orifice 32a. Therefore, the flow resistance (pressure loss) of the refrigerant is reduced, and noise that is likely to occur when the refrigerant passes around the valve support 51 is reduced. In addition, since the refrigerant is rectified and the bubbles contained in the refrigerant are subdivided by the holes 72, noise associated with the bursting of the bubbles is also 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 support portion 51 a of the valve support 51 from below, and the periphery thereof is surrounded by a plurality of spring arm portions 52.

  The refrigerant that has flowed into the valve chamber 35 from the high-pressure channel 32b is likely to flow relatively smoothly toward the orifice 32a through a plurality of holes 72 that are partially formed in the valve support 51a. In the vibration-proof spring 51b of the valve body unit 50, since the spring arm portion 52 extends in the lateral direction of the valve support body 51, the valve support body 51 is connected to the port 32b1 connected to the high-pressure channel 32b in the valve chamber 35. Therefore, the protruding portion 56 of the spring arm portion 52 contacts the inner wall surface 35a above the port 32b1 of the valve chamber 35. Since the spring arm portion 52 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 can be further reduced, and the noise can be further 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 80 shown in FIG. 2 has a valve support body 81 formed by integrally forming a valve support portion 81a and an anti-vibration spring 81b, and a plurality of coolant passage notches 83 are appropriately provided in the valve support portion 81a. It is formed with an interval of. The notch 83 is formed by cutting from the outer peripheral side of the valve support portion 81a, preferably at equal intervals, between the adjacent bent portions 53 and 53 toward the central portion that supports the valve body 58. In the valve body unit 50 shown in FIG. 1, the notch 83 is formed by the refrigerant flowing into the valve chamber 35 from the high-pressure channel 32 b in the valve body unit 50 as in the case of the plurality of holes 72 formed in the valve support portion 51 a. When passing through the support 81, it is easy to flow smoothly toward the orifice 32a, so that resistance to the flow of the refrigerant is reduced and noise is reduced.

  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. A valve body unit 90 shown in FIG. 3 is obtained by molding a valve body 98 integrally with a valve support 91. Since the configuration other than the configuration relating to the valve body 98 is the same as the example shown in FIG. 1, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, the valve body 98 is formed in a dome shape that bulges upward integrally with the valve support portion 91a at the central portion of the valve support portion 91a of the valve support body 91. The shape of the valve body 98 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.

  In the valve support portion 91a of the valve support 91, a plurality of coolant passage holes 72 are formed at appropriate intervals in the circumferential direction, as in the example shown in FIG. Further, the spring arm portion 52 of the anti-vibration spring portion 91b is equivalent to the substantially L-shaped spring arm portion formed in the example shown in FIGS. By molding the valve body 98 integrally with the valve support body 91, a step of fixing a spherical valve body manufactured separately as in the prior art to the valve mounting portion by welding or the like can be omitted. Also in this example, a notch 83 as shown in FIG. 2 can be formed in place of the hole 72.

  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 100 shown in FIG. 4 is not a spherical valve body in which the valve body 108 is manufactured separately, but is formed integrally with the valve support body 101 as in the example shown in FIG. Specifically, the valve body 108 is formed in a dome shape bulging upward integrally with the valve support portion 101a at the central portion of the valve support portion 101a of the valve support body 101. A plurality of refrigerant passage holes 72 are formed in the valve support portion 101a at appropriate intervals in the circumferential direction. Also in this example, it is needless to say that a notch 83 as shown in FIG.

  The anti-vibration spring 101b includes a cylindrical tubular portion 103 that extends integrally from the outer periphery of the valve support portion 101a. The tubular portion 103 having the valve support portion 101a and the vibration-proof spring 101b can be manufactured by press forming a metal plate. The spring arm portion 102 is formed by cutting and raising in the lateral direction at a plurality of locations of the tubular portion 103 (in this example, four locations at equal angles when viewed from the center of the valve support portion 101a). A protruding portion 106 is formed at the distal end portion of the spring arm portion 102, and the protruding portion 106 contacts the inner wall of the valve chamber 35 by a spring action. By molding the valve body 108 integrally with the valve support body 101, a step of fixing a spherical valve body manufactured separately as in the conventional art to the valve mounting portion by welding or the like can be omitted.

  The expansion valve has been described as an example of the valve device according to the present invention. However, the present invention is not limited to this, and includes a valve body that controls the flow rate of fluid passing through the orifice and a valve support body that supports the valve body. Obviously, it can be applied to any valve device.

1 Refrigeration cycle 2 Compressor 3 Condenser
4 Receiver 5 Expansion valve 6 Evaporator
8c Compression coil spring 30 Valve body 32a Orifice 35 Valve chamber 51, 81, 91, 101 Valve support 51a, 81a, 91a, 101a Valve support 51b, 81b, 91b, 101b Anti-vibration spring 52, 102 Spring arm 58, 98,108 Valve body 103 Cylindrical part 72 Hole 83 Notch

Claims (8)

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 while contacting and leaving the orifice; and a valve support that supports the valve body A valve device comprising a body,
The valve device depressurizes the high-pressure liquid-phase refrigerant condensed in the condenser and introduced into the valve chamber by the orifice, and the valve element based on the temperature of the low-pressure gas-phase refrigerant evaporated by the evaporator. It is a temperature type expansion valve that controls opening and closing,
The valve chamber is connected to a port of a high-pressure side flow channel for introducing the liquid-phase refrigerant from a direction intersecting with a direction in which the orifice and the valve body are in contact with and separated from each other.
Hole or a cutout provided Rutotomoni passing fluid into the valve support, the valve, characterized in that disposed on the orifice side the valve support to the port of the high-pressure flow path in said valve chamber apparatus.   2. The valve device according to claim 1, wherein the hole or notch is formed in a size and shape suitable for subdividing bubbles contained in the fluid.   The valve device according to claim 1 or 2, wherein a plurality of the holes or notches are formed at equal intervals around the valve body. The valve support, the valve device according to any one of claims 1 to 3 a vibration-proof spring to prevent vibration of the valve body is characterized in that it is integrally formed on the valve support.   The said vibration-proof spring consists of several spring arm parts which extend integrally from the outer periphery of the said valve support body via a bending part, and contact | abut to the wall surface of the said valve chamber. Valve device. The vibration-proof springs, the valve support according to claim 4 valve arrangement, wherein the comprising a plurality of spring arms in contact with the wall surface of the valve chamber extends in the closing direction of the valve body from the outer peripheral edge of the .   The coil spring for urging the valve body in the valve closing direction is provided, and one end of the coil spring is in contact with the valve support body in a state surrounded by the vibration-proof spring. The valve apparatus in any one.   The valve device according to any one of claims 1 to 7, wherein the valve body is formed integrally with the valve support.

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