JP4704451B2 - Vibration isolator for expansion valve - Google Patents

Description

  The present invention relates to a vibration isolating member for an expansion valve used for an expansion valve constituting a refrigeration cycle.

  Although there are various types of expansion valves, the valve body is arranged so as to face the orifice formed by narrowing the middle of the high-pressure refrigerant passage through which the high-pressure refrigerant sent to the evaporator passes, and evaporates. A valve that opens and closes a valve body in accordance with the temperature and pressure of a low-pressure refrigerant delivered from a vessel is widely used.

  As this type of expansion valve, there is one used in the refrigeration cycle 1 such as an air conditioner for an automobile shown in FIG. That is, the refrigeration cycle 1 includes a refrigerant compressor 2 driven by an engine, a condenser 3 connected to the discharge side of the refrigerant compressor 2, a liquid receiver 4 connected to the condenser 3, and a liquid receiver An expansion valve 5 for adiabatically expanding the liquid-phase refrigerant from the vessel 4 into a gas-liquid two-phase refrigerant, and an evaporator 6 connected to the expansion valve 5. The expansion valve 5 is located in the refrigeration cycle 1. Yes.

The expansion valve 5 is provided with a high-pressure side passage 5b through which liquid-phase refrigerant flows into the valve body 5a and a low-pressure side passage 5c through which adiabatic-expanded gas-liquid two-phase refrigerant flows out. The valve chamber 8d is provided with a valve body 8 that communicates with the cylinder 5c through the orifice 7 and adjusts the amount of refrigerant that passes through the orifice 7.
The expansion valve 5 is formed through the low-pressure refrigerant passage 5d in the valve main body 5a, and a plunger 9a is slidably disposed in the low-pressure refrigerant passage 5d. The plunger 9a is connected to the valve main body 5a. It is driven by a temperature sensitive drive unit 9 fixed at the top. The temperature sensitive drive unit 9 is partitioned by a diaphragm 9d to form an upper hermetic chamber 9c and a lower hermetic chamber 9c ′. A disk portion 9e at the upper end of the plunger 9a abuts on the diaphragm 9d.
Further, a compression coil spring 8a that presses the valve body 8 in the valve closing direction via a support member 8c is disposed in the valve chamber 8d at the lower portion of the valve body 5a. The valve chamber 8d is screwed with the valve body 5a. It is formed by the adjusting screw 8b to be joined, and airtightness is maintained by the O-ring 8e. An operating rod 9b that moves the valve body 8 in the valve opening direction by sliding of the plunger 9a is in contact with the lower end of the plunger 9a.

Then, the plunger 9a in the temperature sensitive drive unit 9 transmits the temperature in the low-pressure refrigerant passage 5d to the upper airtight chamber 9c, and the pressure in the upper airtight chamber 9c changes according to the temperature. For example, when the temperature is high, when the pressure in the upper hermetic chamber 9c rises and the diaphragm 9d pushes down the plunger 9a, the valve body 8 moves in the valve opening direction and the amount of refrigerant passing through the orifice 7 increases. The temperature of 6 is lowered.
On the other hand, when the temperature is low, the pressure in the upper hermetic chamber 9c is lowered, the force for pushing down the plunger 9a by the diaphragm 9d is weakened, and the valve body 8 is moved in the valve closing direction by the compression coil spring 8a pressing in the valve closing direction. The amount of refrigerant passing through the orifice 7 is reduced, and the temperature of the evaporator 6 is raised.

  Thus, the expansion valve 5 moves the valve body 8 in accordance with the temperature change in the low-pressure refrigerant passage 5d to change the opening area of the orifice 7, and adjusts the refrigerant passage amount to adjust the temperature of the evaporator 6. I am trying. In this type of expansion valve 5, the opening area of the orifice 7 that adiabatically expands from the liquid-phase refrigerant to the gas-liquid two-phase refrigerant adjusts the spring load of the compression coil spring 8 a that presses the valve body 8 in the valve closing direction. It is set by adjusting with the screw 8b.

However, pressure fluctuation may occur upstream of the high-pressure refrigerant sent to the expansion valve in the refrigeration cycle, and the pressure fluctuation is transmitted to the expansion valve using the high-pressure refrigerant liquid as a medium.
Then, in the conventional expansion valve as described above, when the upstream refrigerant pressure is transmitted to the valve body by pressure fluctuation, it may cause a problem that the operation of the valve body becomes unstable. In some cases, the flow control of the expansion valve is not accurately performed, or noise may be generated due to vibration of the valve body.

Therefore, as a conventional countermeasure, the valve body is biased from the side by a spring or the like to the rod disposed so as to be movable back and forth in the axial direction between the power element and the valve body so that the pressure of the high pressure side refrigerant is increased. There is a means (see Patent Document 1) that stabilizes the operation without reacting sensitively to fluctuations.
JP 2001-50617 A

  However, although the conventional expansion valve as described above can achieve the purpose of stabilizing the operation against the pressure fluctuation of the high-pressure refrigerant, the spring that pushes the rod that advances and retreats in the axial direction from the side must be arranged in a stable state. Therefore, there is a risk that the structure and assembly work become complicated and cost increases.

  Therefore, an object of the present invention is to provide a vibration isolating member for an expansion valve that is simple and low in cost, and can stabilize the operation against pressure fluctuations of a high-pressure refrigerant.

In order to solve the above problems, the present invention has taken the following measures. The vibration-proof member for an expansion valve according to claim 1 includes a valve body including an orifice that communicates a high-pressure side passage through which high-pressure refrigerant flows and a low-pressure side passage through which low-pressure refrigerant flows, and opens and closes the orifice. An expansion valve comprising: a valve body that adjusts the amount of refrigerant flowing through the valve body; an operating rod that is separate from the valve body and that moves the valve body in the opening direction; and a temperature-sensitive drive unit that drives the operating rod. The valve body or the support member is provided on the upstream side of the orifice in the high-pressure side passage, and acts as a restraining means for the valve body or a support member integrated with the valve body to prevent vibration of the valve body or the support member. In the vibration damping member for the expansion valve to be performed,
An annular annular portion that is elastically deformable attached to the valve main body, and a plate-shaped vibration-proof spring that is cut out from the annular portion in the circumferential direction and formed integrally with the annular portion; parts are Ri diameter changeable der by either or both elongated plate-like elastic material is formed so as to form a C-shape is formed so as to overlap in the thickness direction, the valve member by-proof vibration spring or it characterized that you effect the support member as said restraining means of said valve body or said support member by elastically supporting.

Vibration isolating members for expansion valve according to claim 2, wherein, in the vibration isolating member for a expansion valve according to claim 1, wherein, in a plurality of locations spaced in a circumferential direction of the annular portion, an axially intermediate portion or the annular of the annular portion The anti-vibration spring is cut out in the circumferential direction from one side peripheral portion of the portion .

Vibration isolating members for expansion valve according to claim 3, wherein, in the vibration isolating member for a expansion valve according to claim 1 or 2, wherein said vibration isolating spring tip in the direction of the center portion of the annular portion in a convex shape It is curved, and is elastically brought into contact with the valve body or the support member at the curved tip .

The expansion valve vibration-proof member according to claim 4 is the expansion valve vibration-proof member according to any one of claims 1 to 3, wherein the vibration-proof spring is cut out from one end portion of the annular portion and is vacant. A tongue piece formed at the other end portion of the annular portion enters the portion.

The vibration damping member for an expansion valve according to the present invention can be manufactured at a low cost with a very simple structure, and can reliably suppress the vibration of the expansion valve due to the pressure fluctuation of the refrigerant. The vibration isolator for an expansion valve according to the present invention is formed such that the annular portion is formed in a C shape using an elongated plate-like elastic material, or both ends are overlapped in the thickness direction. Because the diameter can be changed by the above, it is easy to process, and by reducing the diameter when mounting on the valve body, it can be easily mounted on the valve body, and after mounting it tries to return to its original diameter elastically. As a result, in the mounted state, the valve body is brought into close contact with and securely held. Furthermore, since the vibration isolating spring is cut out from the annular portion in the circumferential direction, the vibration isolating member is configured to be compact in the axial direction and does not require a large mounting space in the valve body, so that the expansion valve can be made compact. be able to.

  Hereinafter, embodiments of the expansion valve of the present invention will be described with reference to the drawings.

  First, Example 1 of the present invention will be described. FIG. 1 is a cross-sectional view of a main part of an expansion valve equipped with the vibration damping member for an expansion valve according to the first embodiment, FIG. 2 is a perspective view of the vibration damping member for the expansion valve, and FIG. It is a perspective view in the state where is supporting a valve element. In the expansion valve of FIG. 1, the same parts as those of the expansion valve of FIG. 11 are denoted by the same reference numerals, and the parts not shown in FIG. 1 will be described with reference to FIG.

  The expansion valve in FIG. 1 is driven by a temperature-sensitive drive unit 9 that operates in accordance with the temperature and pressure of the low-pressure refrigerant sent out from the evaporator 6, and the flow rate of the refrigerant that the valve body 8 flows into the evaporator 6 is adjusted. Therefore, the vibration isolator 10 for the expansion valve is disposed close to the valve body 8.

The valve body 5a includes an orifice 7 that communicates a high-pressure side passage 5b into which refrigerant flows and a low-pressure side passage 5c from which refrigerant flows out, and the valve body 8 adjusts the amount of refrigerant flowing through the orifice 7.
The expansion valve includes an operating rod 9b that operates the valve body 8 in the valve opening direction, and a temperature-sensitive drive unit 9 that drives the operating rod 9b. An expansion valve vibration-proof member 10 is disposed upstream of the orifice 7 in the high-pressure side passage 5b. The expansion valve vibration-proof member 10 is mounted on the valve body 5a and elastically supports the valve body 8 by an elastic force.

The valve body 8 is formed in a ball shape as shown in FIGS. 1 and 3, the valve body 8 is supported by a support member 8 c integrated therewith, and the vibration isolator 10 for the expansion valve is the valve body 8 or the support member. Either or both of 8c are elastically supported. 1 and 3 show a case where only the valve body 8 is elastically supported.
As shown in FIGS. 2 and 3, the vibration isolator 10 for an expansion valve is formed of steel having a high metal elasticity, for example, stainless steel, and an annular portion 11 that is elastically deformable, and the annular portion 11. The anti-vibration springs 12 are, for example, four curved plate-shaped anti-vibration springs, which are cut out from the anti-vibration springs 12. Yes. The four vibration-proof springs 12 elastically support the peripheral surface of the ball-shaped valve body 8. The expansion valve vibration-proof member 10 has a slit 13 formed in a part of the annular portion 11 so that the diameter can be reduced when the vibration-proof member 10 is attached to the valve body 5a.
According to the vibration isolator 10 for an expansion valve having such a configuration, the annular portion 11 is attached to the valve body 5a, so that the valve body 8 is supported by the vibration isolating springs 12 at four locations on its peripheral surface. Even if the refrigerant pressure fluctuates in the refrigeration cycle, the operation of the valve body 8 can be stabilized, and the generation of noise caused by accurate control of the refrigerant flow rate and vibration of the valve body 8 can be prevented.

Example 2 is shown in FIG. In the second embodiment, the vibration isolating member 10a for an expansion valve is constituted by one annular portion 11a and a plate-like vibration-proof spring 12a disposed on one side of the annular portion 11a. is there. In addition, like the expansion valve vibration isolator 10 of the first embodiment, the expansion valve vibration isolator 10a has a slit formed in a part of the annular portion 11a so that the diameter can be reduced when the valve body 5a is mounted. 13a is formed.
The anti-vibration spring 12a according to the second embodiment is formed of a curved plate whose tip is formed in a convex shape toward the center of the annular portion 11a, and supports the peripheral surface of the valve body 8 on its side surface. In the second embodiment, as in the first embodiment, the anti-vibration spring 12a is formed by cutting out from the annular portion 11a.

  In the second embodiment having such a configuration, as in the second embodiment shown in FIGS. 2 and 3, when the refrigerant pressure fluctuates in the refrigeration cycle, noise generated by accurate control of the refrigerant flow rate and vibration of the valve body 8. Can be prevented.

  Example 3 is shown in FIGS. FIG. 5 is a perspective view of the vibration damping member for an expansion valve according to the third embodiment, FIG. 6 is a perspective view of a state in which the vibration damping member for the expansion valve is mounted, and FIG. It is a perspective view of a state.

In the third embodiment, instead of the slits 13 and 13a of the first and second embodiments, both end portions of the plate body forming the annular portion 11b overlap in the thickness direction to form an intersecting portion. As shown in FIG. 5, as shown in FIG. 5, a tongue piece 11 b ′ having a narrow predetermined length is extended from one end portion of the annular portion 11 b with the same curvature as the annular portion 11 b, and is connected to the other end of the annular portion 11 b. Forms a tongue receiving recess 11b ″ for guiding and supporting the tongue 11b ′.
The tongue piece receiving recess 11b ″ is formed between the upper edge portion and the lower edge portion in the vicinity of the other end portion of the annular portion 11b, and the tongue piece 11b ′ is formed into the tongue piece receiving recess portion 11b ″ in the valve body 5a. In the overlapped state, the annular portion 11b is formed by the tongue piece 11b ′ so that there is no gap between the annular portion 11b and the inner wall of the valve body 5a. Therefore, the depth of the tongue piece receiving recess 11b ″ is preferably the same as or greater than the thickness of the tongue piece 11b ′.

  Similarly to the first and second embodiments, the vibration isolator 10b for the expansion valve according to the third embodiment is formed of steel having a high metal elasticity, such as stainless steel, and cut out from the annular portion 11b. For example, FIG. As shown in FIG. 3, the vibration isolating spring 12b is composed of three curved plate bodies, and the anti-vibration spring 12b is configured such that the tip is curved convexly toward the center of the annular portion 11b. . And as shown in FIG. 7, the surrounding surface of the valve body 8 is elastically supported by the three anti-vibration springs 12b.

According to the vibration isolator 10b for an expansion valve having such a configuration, in the state where the annular portion 11b is mounted on the valve body 5a, the valve body 8 supports its peripheral surface by the vibration isolating springs 12b at the minimum required number of three locations. Thus, the vibration isolator 10b for the expansion valve acts as a restraining means for the valve body 8. Even if the refrigerant pressure fluctuates in the refrigeration cycle, the operation of the valve body 8 can be stabilized. The generation of noise caused by the accurate control and the vibration of the valve body 8 can be prevented.
Moreover, in Example 3, since there is no slit in the annular portion 11b, the expansion valve vibration-proofing members 10b are connected to each other even when a large number of expansion valve vibration-proofing members 10b are bundled or in the automatic assembly process of the expansion valve. There is an effect that the automatic assembling process is smoothly performed.

  Example 4 is shown in FIGS. FIG. 8 is a perspective view of the vibration damping member for an expansion valve according to the fourth embodiment, FIG. 9 is a perspective view of a state in which the vibration damping member for the expansion valve is mounted, and FIG. It is a perspective view of a state. As shown in FIG. 8, the fourth embodiment is an expansion composed of one annular portion 11c and three plate-like vibration-proof springs 12c arranged on one side of the annular portion 11c. The valve vibration-proof member 10c is used. As in the third embodiment, an intersection is formed at the end of the plate forming the annular portion 11c. As the intersection, a narrow tongue piece 11c 'is formed from one end of the annular portion 11c. It extends with the same curvature as 11c. The other end of the annular portion 11c is formed with a narrow width so that it intersects the tongue piece 11c 'in the same plane. The shape, material and number of the anti-vibration springs 12c are the same as those in the third embodiment.

  According to the vibration isolator 10c for an expansion valve having such a configuration, the valve body 8 is vibration-isolated at three locations on its peripheral surface as shown in FIG. 10 in a state where the annular portion 11c is mounted on the valve body 5a. The expansion valve vibration-proof member 10c, which is supported by the spring 12c, acts as a restraining means for the valve body 8. Therefore, even if the refrigerant pressure fluctuates in the refrigeration cycle, the operation of the valve body 8 can be stabilized, and accurate control of the refrigerant flow rate and generation of noise caused by vibration of the valve body 8 can be prevented. it can.

In each of the above embodiments, the anti-vibration springs 12, 12a, 12b, and 12c constituting the expansion valve anti-vibration members 10, 10a, 10b, and 10c are formed to have the same width over the entire width. Of course, for example, the elasticity may be adjusted by making the tip end a triangular shape having a vertex. Moreover, although Example 3 and 4 were shown as an embodiment of a cross | intersection part, it cannot be overemphasized that another shape may be sufficient.
In addition, the slits 13 and 13a of the first and second embodiments are formed so as to cross at right angles to the circumferential direction of the expansion valve vibration isolating members 10 and 10a. You may incline and form with respect to the circumferential direction.

The principal part sectional drawing of the expansion valve with which the vibration isolator for expansion valves of Example 1 was mounted | worn. FIG. 3 is a perspective view of an expansion valve vibration-proof member according to the first embodiment. The perspective view of the state which the vibration isolator for expansion valves of Example 1 is supporting the valve body. The perspective view of the vibration isolator for expansion valves of Example 2. FIG. The perspective view of the vibration isolator for expansion valves of Example 3. FIG. The perspective view of the mounting state of the vibration isolator for expansion valves of Example 3. FIG. The perspective view of the state in which the vibration isolator for expansion valves of Example 3 is supporting the valve body. The perspective view of the vibration isolator for expansion valves of Example 4. FIG. The perspective view of the mounting state of the vibration isolator for expansion valves of Example 4. FIG. The perspective view of the state which the vibration isolator for expansion valves of Example 4 is supporting the valve body. Sectional drawing of the expansion valve in a refrigerating cycle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle 2 ... Refrigerant compressor 3 ... Condenser 4 ... Liquid receiver 5 ... Expansion valve 5a ... Valve body 5b ... High-pressure side passage 5c ... Low pressure Side passage 5d ... Low pressure refrigerant passage 6 ... Evaporator 7 ... Orifice 8 ... Valve element 8a ... Compression coil spring 8b ... Adjustment screw 8c ... Support member 8d ... Valve Chamber 8e ... O-ring 9 ... Temperature sensitive drive unit 9a ... Plunger 9b ... Operating rod 9c ... Upper airtight chamber 9c '... Lower airtight chamber 9d ... Diaphragm 9e ... Disc parts 10, 10a, 10b, 10c .. Antivibration members for expansion valves 11, 11a, 11b, 11c .. Annular parts 11b ', 11c' .. Tongue piece 11b ".. Tongue piece receiving recesses 12, 12a, 12b 12c · Anti-vibration springs 13 and 13a · · Slit

Claims (4)

A valve body having an orifice communicating with a high-pressure side passage through which high-pressure refrigerant flows and a low-pressure side passage through which low-pressure refrigerant flows; a valve body that opens and closes the orifice to adjust the amount of refrigerant flowing through the orifice; It is used in an expansion valve that is separate from the valve body and includes an operating rod that moves the valve body in the opening direction and a temperature-sensitive drive unit that drives the operating rod, and the orifice of the orifice in the high-pressure side passage In an anti-vibration member for an expansion valve that is provided on the upstream side and acts as a restraining means for the valve body or a support member integral with the valve body to perform vibration isolation of the valve body or the support member.
An elastically deformable annular annular portion mounted on the valve main body, and a plate-shaped vibration-proof spring that is cut out from the annular portion in the circumferential direction and formed integrally with the annular portion ;
Said annular portion, Ri diameter changeable der by either or both elongated plate-like elastic material is formed so as to form a C-shape is formed so as to overlap in the thickness direction,
-Proof vibration spring by said valve body or said support member said valve body or said support member said expansion valve damping member characterized that you act as restraining means to by elastically supporting. The anti-vibration spring is cut out in a circumferential direction from an axially intermediate portion of the annular portion or one side peripheral portion of the annular portion at a plurality of locations separated in the circumferential direction of the annular portion. 1. A vibration-proof member for an expansion valve according to 1. The anti-vibration spring has a tip curved in a convex shape toward the center of the annular portion, and is elastically brought into contact with the valve body or the support member at the curved tip. The vibration-proof member for an expansion valve according to claim 1 or 2, wherein the vibration-proof member is an expansion valve. 4. A tongue piece formed at the other end of the annular portion enters a portion of the annular portion where the anti-vibration spring is cut out from one end of the annular portion. An anti-vibration member for an expansion valve according to claim 1.

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