CN110701835B - Temperature sensing type control valve - Google Patents
Temperature sensing type control valve Download PDFInfo
- Publication number
- CN110701835B CN110701835B CN201910537071.8A CN201910537071A CN110701835B CN 110701835 B CN110701835 B CN 110701835B CN 201910537071 A CN201910537071 A CN 201910537071A CN 110701835 B CN110701835 B CN 110701835B
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- stopper
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- side stopper
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- 239000003507 refrigerant Substances 0.000 claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 238000003780 insertion Methods 0.000 claims description 23
- 230000037431 insertion Effects 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 abstract description 12
- 239000012530 fluid Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 11
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 239000007787 solid Substances 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 230000001012 protector Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000004308 accommodation Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
A thermocouple (20) is protected in a temperature-sensitive control valve (100) provided in a pipe for supplying a refrigerant of a cooling device for cooling a heat source to be cooled. A piston (32) of the thermocouple is provided so as to be capable of protruding or sinking into the end of the guide portion (22 a). A valve device body (10) is provided which opens and closes a valve port through which a refrigerant flows by a valve element (3). The structure portion including the valve element is sealed by a diaphragm (43). An operation part (4) is provided for transmitting the mechanical pressing force in the axial direction to the valve element via the diaphragm. The operating section is provided with an upper stopper (45) on the piston side of the diaphragm. A stopper mechanism is constituted by an operation section side stopper end (4T1) provided on the upper stopper and a fixed stopper end (ST1) opposed to the operation section side stopper end in the axis (L) direction. A gap D1 between the end of the piston (23) and the operating end (P) of the upper stopper, and a gap D2 between the fixed stopper end and the operating portion side stopper end are D1 > D2.
Description
Technical Field
The present invention relates to a temperature-sensitive control valve for supplying a refrigerant to a cooling device or the like for cooling a heat source.
Background
In the field of information processing, for example, a system that generates heat in a large amount, such as a server, is cooled by a circulating refrigerant. For example, japanese patent application laid-open No. 2009-224406 (patent document 1) discloses an exhaust heat utilization system in which a cooling device is disposed in a rack of a blade server to cool the inside of the rack. Further, japanese unexamined patent publication No. 52-103437 (patent document 2) discloses a thermocouple and a piston assembly suitable for sensing the temperature of a heat source.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-224406
Patent document 2: japanese Kokai publication Sho-52-103437
Disclosure of Invention
Problems to be solved by the invention
In the technique of patent document 1, cooling is performed using cooling water (refrigerant), but the amount of heat generated in a device such as a server greatly changes depending on the operating state. Therefore, when the temperature of the heat source reaches the set temperature, the valve port is required to be opened greatly immediately, and cooling is required to be performed quickly. In contrast, it is conceivable to sense the temperature of the heat source by a thermocouple, and apply the operating force of the thermocouple to the operation portion of the valve device main body to open and close the valve of the valve device main body.
Here, for example, when the valve device body is provided in a pipe for supplying a refrigerant in the cooling device, the following problems arise as an example. When the refrigerant is replenished to the pipe for supplying the refrigerant, an excessive pressure may be applied to the valve device main body through the pipe. For example, the valve device of patent document 2 is used to switch or stop the flow of the refrigerant in accordance with the temperature of the refrigerant for cooling the server. However, when the refrigerant is replenished, an abnormal load may be applied in the compression direction of the thermally expandable body via the shaft (8) of the thermocouple due to an excessive pressure applied through the pipe of the valve device, and the thermocouple may be damaged.
The present invention addresses the problem of providing a temperature-sensitive control valve which is provided in a pipe for supplying a refrigerant in a cooling device that cools a heat source to be cooled, and which supplies the refrigerant by sensing a change in temperature of the heat source using a thermocouple, and which prevents the thermocouple from being damaged.
Means for solving the problems
The temperature-sensitive control valve according to claim 1 includes: a thermocouple having a piston to which a volume change of a thermal expansion body that expands and contracts in accordance with a temperature change is transmitted, and a guide portion that slidably guides the piston in an axial direction; and a valve device main body that opens and closes a valve port through which a refrigerant flows by a valve element, and that includes an operation portion that seals a structural portion including the valve element by a seal member and transmits a mechanical pressing force in the axial direction to the valve element via the seal member, wherein the valve port is opened by the valve element by applying the mechanical pressing force generated by movement of the piston of the thermocouple in the axial direction to the seal member, and the operation portion includes a piston-side stopper disposed on the piston side of the seal member, and is characterized in that an operation-portion-side stopper end provided on the piston-side stopper and a fixed-side stopper end disposed opposite to the operation-portion-side stopper end in the axial direction are provided on the operation portion, and the operation portion is configured to protrude from or retract into an end portion of the guide portion The stopper end constitutes a stopper mechanism, and a gap D1 between the end of the piston at the maximum retraction and the operating end of the piston-side stopper on which the piston acts, and a gap D2 between the fixed stopper end and the operating-side stopper end are D1 > D2.
The temperature-responsive control valve according to claim 2 is characterized in that a guide insertion hole through which the guide portion is inserted is formed in the piston-side stopper, an end portion of the guide portion constitutes the fixed stopper, and a bottom portion of the guide insertion hole constitutes the operation-portion-side stopper.
A temperature-responsive control valve according to claim 3 is characterized in that a guide insertion hole through which the guide portion is inserted is formed in the piston-side stopper, the diameter-expanded main body case portion of the thermocouple forms the fixed stopper, and a surface of the piston-side stopper around an opening of the guide insertion hole forms the operation-portion-side stopper.
The temperature-responsive control valve according to claim 4 is characterized in that the operating portion includes a cylindrical holding case portion that holds the thermocouple by enclosing at least the guide portion and the piston-side stopper, a step portion formed in the holding case portion constitutes the fixed stopper end, and an end surface of the piston-side stopper on the fixed stopper end side constitutes the operating-portion-side stopper end.
The effects of the invention are as follows.
According to the temperature-responsive control valve of claims 1 to 4, even if a high pressure is applied to the sealing member of the operation portion of the valve device body and the sealing member is displaced in the direction opposite to the action of the piston when, for example, the refrigerant is replenished to the pipe for supplying the refrigerant of the cooling device, the piston-side stopper is brought into contact with the fixed stopper end by the stopper mechanism to prevent excessive displacement of the sealing member, thereby preventing breakage of the thermocouple.
Further, since the sealing member is provided, the thermocouple does not come into contact with the refrigerant due to the sealing member, and thus even if an abnormally high pressure is applied to the valve device body at the time of refrigerant replenishment, abnormal deformation or breakage of the rubber piston or diaphragm of the thermocouple can be prevented. Further, even when the refrigerant enters the thermocouple, the volume of the fluid or the like may increase to cause variation in the valve opening point, and swelling or deterioration of the rubber piston or the diaphragm may occur.
According to the temperature responsive control valve of claim 2, since the guide portion of the thermocouple is used as the fixed stopper, the stopper mechanism can be easily constituted only by setting the depth of the guide insertion hole of the piston-side stopper.
According to the temperature-sensitive control valve of claim 3, since the contact area of the stopper mechanism can be increased and the load can be received with a large area, the strength of the stopper mechanism is increased. Further, since the piston side stopper is abutted with a large area, the piston side stopper is less likely to be inclined.
According to the temperature-responsive control valve of claim 4, since the position of the stopper mechanism does not affect the size of the thermocouple, the function of the stopper mechanism can be reliably exhibited even when the variation in the size of the thermocouple is large. Further, since the piston side stopper is formed in a large diameter shape up to the vicinity of the inner periphery of the cylindrical holding case portion, a load is received with a large area as a result, and the strength of the stopper mechanism is increased. Moreover, since the contact is performed with a large area, the inclination is difficult.
Drawings
Fig. 1 is a longitudinal sectional view of a temperature-responsive control valve according to an embodiment of the present invention.
Fig. 2 is a plan view of the temperature-responsive control valve of the embodiment.
Fig. 3 is a longitudinal sectional view of a thermocouple in the temperature responsive control valve of the embodiment.
Fig. 4 is a graph showing temperature-displacement characteristics of a thermocouple in the temperature-responsive control valve of the embodiment.
Fig. 5 is an enlarged longitudinal sectional view of a main portion of the temperature responsive control valve according to the embodiment when the piston is maximally retracted.
Fig. 6 is an enlarged longitudinal sectional view of a main portion of the temperature responsive control valve according to the embodiment when a piston protrudes.
Fig. 7 is an enlarged longitudinal sectional view of a main part of the temperature responsive control valve according to the embodiment in operation of the stopper mechanism.
Fig. 8 is an enlarged longitudinal sectional view of a main part of modification 1 of the temperature-responsive control valve according to the embodiment.
Fig. 9 is an enlarged longitudinal sectional view of a main part of modification 2 of the temperature-responsive control valve according to the embodiment.
In the figure:
1-a valve housing, 1A-a valve chamber, 11-a first port, 12-a second port, 13-a valve port, 14-a guide hole, L-an axis, 21-a temperature-sensitive housing, 21A-a temperature-sensitive part, 21B-a temperature-sensitive part side base, 22-a guide housing, 22A-a guide part, 22B-a guide side base, 23-a piston, 24-a diaphragm, 25-a rubber piston, 26-a protector plate, 2A-a thermal expansion body, 2B-a flow body, 3-a spool, 3 a-a valve stem, 3B-a needle-like part, 3 c-a flange part, 3a '-a valve stem, 31-a spring seat, 32-a coil spring, 4-an operating part, 41-a lower cover, 42-an upper housing, 42A cylindrical part, 42A 1-a step part, 43-a diaphragm, 44-a lower stopper (spool side stopper), 45-an upper stopper (piston side stopper), 45', 46-fixed spring, 47-coil spring, 45 a-play hole, 45 b-guide insertion hole, 45b ' -guide insertion hole, 45b "-guide insertion hole, 45 c-spring accommodation hole, 45c ' -spring accommodation hole, 45 c" -spring accommodation hole, 4 ' -operation portion, 44 ' -lower stopper (spool-side stopper), 44a ' -play hole, 45 ' -upper stopper (piston-side stopper), 45a ' -piston hole, P-operation end portion, ST 1-fixed stopper end, ST 2-fixed stopper end, ST 3-fixed stopper end, 4T 1-operation portion-side stopper end, 4T 2-operation portion-side stopper end, 4T 3-operation portion-side stopper end, 10-valve device body, 20-thermocouple, 100-temperature-sensitive control valve.
Detailed Description
Next, an embodiment of the temperature-sensitive control valve according to the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of a temperature responsive control valve according to an embodiment, fig. 2 is a plan view of the temperature responsive control valve, and fig. 3 is a longitudinal sectional view of a thermocouple in the temperature responsive control valve. Note that the concept of "top and bottom" in the following description corresponds to the top and bottom in the drawings of fig. 1 and 3. In the following description, the temperature-sensitive control valve according to the embodiment is referred to as a "control valve" as appropriate.
The control valve 100 of the embodiment is composed of a valve device body 10 and a thermocouple 20. The valve device body 10 has a metal valve housing 1, a cylindrical valve chamber 1A is formed in the center of the valve housing 1, a first port 11 that opens to allow a refrigerant to flow in is formed in a side portion of the valve chamber 1A, and a second port 12 through which the refrigerant flows out is formed. A valve port 13 centered on the axis L is formed in the valve housing 1 between the valve chamber 1A and the second port 12, and a guide hole 14 penetrating from the upper portion of the valve housing 1 to the second port 12 is formed coaxially with the valve port 13. The guide hole 14 is formed in a cylindrical shape having the axis L of the valve port 13 as a central axis. Further, the refrigerant may flow into the second port 12 and then flow out of the first port.
The valve body 3 is disposed in the valve chamber 1A, the second port 12, and the guide hole 14. The valve body 3 includes a rod-shaped stem 3a, a substantially conical needle portion 3b for opening and closing the valve opening 13 from the valve chamber 1A side, and a flange portion 3c formed on the outer periphery of the needle portion 3 b. The stem 3a is inserted into the guide hole 14, and a coil spring 32 is disposed between the flange portion 3c and a spring seat 31 at the bottom of the valve chamber 1A. Thereby, the coil spring 32 biases the valve body 3 toward the diaphragm 43 described below.
An operating portion 4 is attached to the valve housing 1 on the side opposite to the valve chamber 1A. The operation unit 4 is constituted by: a lower cover 41 fixed to the valve housing 1; an upper case 42 having the same diameter as the lower cover 41; a diaphragm 43 as a "sealing member" disposed between the lower cover 41 and the upper case 42; a lower stopper 44 as a "spool-side stopper" disposed between the diaphragm 43 and the stem 3a of the spool 3 in the lower cover 41; and an upper stopper 45 as a "piston-side stopper" disposed on the diaphragm 43 in the upper case 42. The lower cover 41, the diaphragm 43, and the upper case 42 are welded at a portion of the outer peripheral edge to be integrally joined. As shown in the plan view of fig. 2, the valve housing 1 is rectangular, and the upper housing 42 (and the lower cover 41 and the diaphragm 43) and the thermocouple 20 are rotationally symmetric about the axis L. The diaphragm 43 is an annular member made of thin-film metal, and has a planar contact surface formed on the outer peripheral portion thereof to contact the flange surface on the plane, a planar contact surface formed on the central portion thereof to contact the upper stopper 45 and the lower stopper 44, and a wavy annular portion formed between the flange surface on the outer peripheral portion and the contact surface on the central portion. The contact surface serves as a surface to which a mechanical pressing force in the direction of the axis L is applied to the valve body 3 via the diaphragm 43.
The lower stopper 44 has a larger contact area with the diaphragm 43 than the area of the tip end surface of the stem 3a on the diaphragm 43 side. Thus, as will be described later, when the diaphragm 43 deforms due to the action of the thermocouple 20 and transmits the pressing force to the valve stem 3a, the reaction force received from the valve stem 3a can be dispersed to the diaphragm 43 by the large area of the lower stopper 44, and the durability of the diaphragm 43 can be improved. Similarly, the upper stopper 45 has a larger contact area with the diaphragm 43 than an area of a front end surface of the piston 23 on the diaphragm 43 side, which will be described later. Accordingly, as compared with the case where the piston 23 directly contacts the diaphragm 43, the pressing force can be dispersedly transmitted to the diaphragm 43 from a larger area of the upper stopper 45, and the durability of the diaphragm 43 can be improved.
Thus, the operation unit 4 has the following functions: the diaphragm 43 and the lower cover 41 seal a structural portion constituted by the lower stopper 44 and the stem 3a, and transmit a mechanical pressing force in the direction of the axis L from the outside of the diaphragm 43, that is, the upper stopper 45 in the upper case 42 to the valve body 3 (stem 3a) via the diaphragm 43 and the lower stopper 44. The thermocouple 20 (a part of the thermocouple) is accommodated in a cylindrical portion 42a of the upper case 42 of the operation unit 4, which is a "holding case portion", and the temperature sensing portion 21a of the thermocouple 20 projects from the upper end of the upper case 42, and a locking piece 42a1 of an end portion of the cylindrical portion 42a is engaged with an end portion of the temperature sensing portion 21a side of the temperature sensing portion side base portion 21b of the thermocouple 20.
The thermocouple 20 is a thermal actuator that utilizes expansion and contraction of paraffin or the like due to temperature change. As shown in fig. 3, the thermocouple 20 includes a temperature sensing case 21, a guide case 22, a piston 23, a diaphragm 24, a rubber piston 25, and a protective plate 26. The temperature sensing case 21 is composed of a cylindrical temperature sensing part 21a having a bottom at an end thereof, and a temperature sensing part side base part 21b covering a part of the guide case 22. The guide housing 22 is composed of a cylindrical guide portion 22a into which the piston 23, the rubber piston 25, and the protective plate 26 are inserted, and a guide side base portion 22b covered with a temperature sensing portion side base portion 21b of the temperature sensing housing 21.
A thermally expandable body 2A made of wax such as paraffin is filled in the main temperature sensing part 21a of the temperature sensing case 21, and the lower end surface of the thermally expandable body 2A is sealed by a diaphragm 24 as an elastic sealing member. A fluid chamber is provided between the mortar-shaped inner surface 22B1 of the guide-side base 22B of the guide housing 22 and the lower side of the diaphragm 24, and the fluid chamber is filled with the fluid 2B. The fluid 2B is a non-compressible fluid having excellent fluidity and lubricity. The piston 23 is slidably inserted through the rubber piston 25 and the protective plate 26 in the piston slide hole 22a1 inside the guide portion 22a of the guide housing 22, and the outer end of the piston 23 protrudes from the piston slide hole 22a 1.
When the ambient temperature of the temperature sensing unit 21a rises, the thermal expansion body 2A expands, the diaphragm 24 expands, and the fluid 2B sealed in the fluid chamber below the diaphragm 24 is pushed down. Thereby, the fluid 2B is deformed and a part thereof enters the piston slide hole 22a1 of the guide portion 22a, and the piston 23 is pushed down via the rubber piston 25 and the protection plate 26.
As shown in fig. 1, a clearance hole 45a, a guide insertion hole 45b, and a spring receiving hole 45c are coaxially formed in the upper stopper 45, the piston 23 of the thermocouple 20 faces the clearance hole 45a, and the guide portion 22a is inserted into the guide insertion hole 45 b. A fixing spring 46 is disposed on the outer periphery of the guide portion 22a, and the fixing spring 46 is disposed in a compressed manner between the temperature sensing portion side base portion 21b and the bottom portion of the spring receiving hole 45c in the cylindrical portion 42 a. That is, as described above, the end of the temperature sensing part side base portion 21b is engaged with the locking piece 42a1 of the cylindrical portion 42a, and the thermocouple 20 is fixed to the cylindrical portion 42a by the elastic force of the fixing spring 46. The temperature sensing unit 21a of the thermocouple 20 protrudes in a cylindrical shape, and is easily attached to the temperature sensing target. The temperature sensing unit 21a is mounted in the mounting hole 50a of the metal plate 50, and the heat from the metal plate 50 is transmitted to the temperature sensing unit 21 a. The metal plate 50 is in close contact with a heat source not shown.
With the above configuration, when the temperature of the temperature sensing unit 21a of the thermocouple 20 increases and the piston 23 descends as described above from the state of fig. 1, the piston 23 abuts on the upper stopper 45 (the bottom of the clearance hole 45 a). When the piston 23 descends, the upper stopper 45 descends to deform the diaphragm 43, and the lower stopper 44 descends, and the valve body 3 abutting against the lower stopper 44 descends. In this way, in this embodiment, the instant when the pressing force of the piston 23 starts to be applied to the valve body 3 via the upper stopper 45, the diaphragm 43, and the lower stopper 44 is the "valve opening point", and from this valve opening point, the needle-like portion 3b of the valve body 3 is separated from the periphery of the valve port 13, and the valve port 13 is opened.
Fig. 4 is a graph showing temperature-displacement characteristics of the thermocouple 20, which shows the relationship between the temperature of the temperature sensing unit 21a and the displacement (up-down) of the piston 23. The thermally expandable body 2A in the temperature sensing unit 21a changes its phase into a solid state, a solid-liquid mixed state in which a solid and a liquid are mixed, and a liquid state depending on the temperature. As a result, the temperature-displacement characteristics show different gradients in the "solid expansion region" in which the expansion is in the solid state, the "solid-liquid mixed expansion region" in which the expansion is in the solid-liquid mixed state, and the "liquid expansion region" in which the expansion is in the liquid state. The gradient in the solid-liquid mixed expansion region, that is, the temperature expansion rate, is the largest (steepest). This temperature-displacement characteristic is known as an inherent characteristic of the thermocouple 20, and in this case, the range of L1 to L3 of the upward and downward movement of the piston 23 corresponds to the "solid-liquid mixture expansion region".
Here, as described above, the valve opening point of the valve device body 10 is set within the above-described "solid-liquid mixed expansion region". In this embodiment, the valve opening point is set to the state of "valve opening movement is 0" and "thermocouple movement is L2" as shown in fig. 4. In this way, by setting the valve opening point in the range of the "solid-liquid mixed expansion region" in which the thermal expansion coefficient of the thermal expansion body 2A in the thermocouple 20 is large, the valve port 13 can be opened quickly and largely when the heat source reaches the set temperature. This enables the refrigerant to be quickly supplied to the cooling device, not shown, following the temperature change of the heat source, and as a result, the heat source can be quickly cooled.
In the thermocouple 20, when the temperature of the temperature sensing unit 21a decreases and the thermally expandable body 2A contracts, the diaphragm 24 may not move and a void may be generated in the solidified thermally expandable body 2A or a void may be generated in the fluid body 2B. Further, the diaphragm 24 may be deformed by contraction in the thermally expandable body 2A, and the fluid 2B may change its shape. In this case, in a state where the piston 23 protrudes, the rubber piston 25 and the protector plate 26 may stay on the piston 23 side, or only the rubber piston 25 may move following the fluid 2B, or the rubber piston 25 and the protector plate 26 may move following the fluid 2B. In either case, in the state where the piston 23 is protruded and stopped, the piston 23 does not apply a pressing force to the operation portion 4 (or the valve body 3), and is in a state different from the "valve opening point" in the present invention.
As shown in fig. 5 and 6, in the upper stopper 45, the bottom of the clearance hole 45a, which the piston 23 faces, serves as an operation end P on which the piston 23 acts. The bottom (annular bottom) of the guide insertion hole 45b through which the guide portion 22a is inserted is an operation portion side stopper 4T 1. Further, an end of the guide portion 22a becomes a fixed stopper end ST1 opposed to the operation portion side stopper end 4T1 in the axis L direction. The operation portion side stopper end 4T1 and the fixed stopper end ST1 constitute a "stopper mechanism" for restricting the upward movement of the upper stopper 45 in the guide portion 22 a. When the piston 23 is maximally retracted into the guide 22a as shown in fig. 5, the width "D1" of the gap between the end of the piston 23 and the operating end P and the width "D2" of the gap between the fixed stopper end ST1 and the operating portion-side stopper end 4T1 are D1 > D2.
Thus, as shown in fig. 7, even if an excessive pressure is applied to the diaphragm 43, the operating end portion P of the upper stopper 45 does not abut on the piston 23, and the operating portion side stopper end 4T1 abuts on the fixed stopper end ST1, thereby restricting further elevation of the upper stopper 45. Therefore, damage and the like of the thermocouple 20 can be prevented.
The "maximum sinking time" of the piston 23 is as follows. The thermally-expansible member 2A is in a solid state in a solid expansion region (when the refrigerant is replenished, the temperature of the thermally-expansible member is normal temperature). Further, a gap may be generated between the piston 23 and the protector plate 26, between the protector plate 26 and the rubber piston 25, and in the thermally expanding body 2A and the fluid 2B. The state of the thermal expansion body without the above gap in the solid expansion region is "at the maximum submerged state". For example, fig. 6 shows a state where a gap is formed in the thermally expandable body 2A, and the piston 23 protrudes according to the size of the gap. Since the gap is vacuum, an abnormal pressure due to replenishment of the refrigerant or the like occurs from this state, and even if the piston 23 moves upward due to the abnormal pressure, no pressure is generated in the interior of the thermally expandable body 2A until the vacuum gap disappears. That is, the thermally-expansible body 2A is not brought into the liquid-compressed state until the piston 23 is brought into the maximally-retracted state. Therefore, in this case, the thermocouple 20 is not broken.
Fig. 8 is an enlarged longitudinal sectional view of a main part of modification 1 of the temperature-responsive control valve according to the embodiment, fig. 9 is an enlarged longitudinal sectional view of a main part of modification 2 of the temperature-responsive control valve according to the embodiment, and in the following modifications, the same elements as those in the embodiment are denoted by the same reference numerals as those in fig. 1 to 3 and 5 to 7, and redundant description thereof is omitted as appropriate.
In modification 1 of fig. 8, the upper stopper 45' as the "piston-side stopper" has a height in the direction of the axis L higher than that of the upper stopper 45 of the embodiment. In the upper stopper 45 ', a guide insertion hole 45b ' and a spring receiving hole 45c ' are coaxially formed, the piston 23 faces the guide insertion hole 45b ', and the guide portion 22a is inserted through the guide insertion hole 45b '. The bottom of the guide insertion hole 45 b' serves as an operation end P on which the piston 23 acts. The surface of the temperature sensing unit side base portion 21 on the upper stopper 45' side, which is the "main body case portion after diameter expansion" of the thermocouple 20, is a fixed stopper ST 2. An end surface of the upper stopper 45' around the guide portion 22a becomes an operation portion side stopper end 4T 2.
When the piston 23 is maximally retracted into the guide 22a, the width "D1" of the gap between the end of the piston 23 and the operating end P and the width "D2" of the gap between the fixed stopper end ST2 and the operating-section-side stopper end 4T2 are D1 > D2. In this modification 1, as in the embodiment, even if an excessive pressure is applied to the diaphragm 43, the operating end portion P of the upper stopper 45 'does not abut on the piston 23, and the operating portion side stopper end 4T2 abuts on the fixed stopper end ST2, thereby restricting further elevation of the upper stopper 45'. Therefore, damage and the like of the thermocouple 20 can be prevented.
In modification 2 of fig. 9, the diameter of the upper stopper 45 "as the" piston side stopper "is larger than the diameter of the upper stopper 45 of the embodiment. At the upper stopper 45 ″, a guide insertion hole 45b ″ and a spring receiving hole 45c ″ are coaxially formed, the piston 23 faces the guide insertion hole 45b ″, and the guide portion 22a is inserted through the guide insertion hole 45b ″. The bottom of the guide insertion hole 45b ″ serves as an operation end P on which the piston 23 acts. A stepped portion 42a1 is formed in the cylindrical portion 42a as the "holding case portion", and the inner surface of the stepped portion 42a1 on the upper stopper 45 "side becomes a fixed stopper ST 3. The upper end surface of the upper stopper 45 ″ facing the fixed stopper end ST3 serves as an operation portion side stopper end 4T 3.
When the piston 23 is maximally retracted into the guide 22a, the width "D1" of the gap between the end of the piston 23 and the operating end P and the width "D2" of the gap between the fixed stopper end ST3 and the operating-section-side stopper end 4T3 are D1 > D2. In this modification 2, as in the embodiment, even if an excessive pressure is applied to the diaphragm 43, the operating end portion P of the upper stopper 45 ″ does not abut on the piston 23, and the operating portion side stopper end 4T3 abuts on the fixed stopper end ST3, thereby restricting further elevation of the upper stopper 45 ″. Therefore, damage and the like of the thermocouple 20 can be prevented.
The thermocouple in the embodiment includes the rubber piston, the protection plate, and the fluid, but may not include them. The thermocouple may be a member that transmits the volume change of the thermal expansion body to the piston.
In the embodiment, the example in which the "sealing member" of the operation portion is constituted by the diaphragm 43 has been described, but the "sealing member" may be a member for sealing a structural portion constituted by a lower stopper, a valve body, and the like, and may be, for example, a bellows or the like.
While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments, and the present invention includes design changes and the like within a range not departing from the gist of the present invention.
For example, the valve element is not limited to a structure in which the valve element abuts against a valve seat around the valve port to completely close the valve port, and a slit or a flow path may be present between the valve element and the valve seat, and a minute bleed flow rate may be present. That is, in the present invention, the "closed state" of the valve port is a concept including a completely closed state and a state in which a discharge flow rate is present.
Claims (4)
1. A temperature-sensitive control valve is provided with:
a thermocouple having a piston to which a volume change of a thermal expansion body that expands and contracts in accordance with a temperature change is transmitted, and a guide portion that slidably guides the piston in an axial direction; and
a valve device main body that opens and closes a valve port through which a refrigerant flows by a valve element, and that has an operation portion that seals a structural portion including the valve element with a seal member and transmits a mechanical pressing force of the piston in the axial direction to the valve element through the seal member in the axial direction,
the valve is configured such that the valve port is opened by the valve body by applying a mechanical pressing force to the sealing member, the mechanical pressing force being generated by the movement of the piston of the thermocouple in the axial direction,
the temperature-sensitive control valve described above is characterized in that,
the piston of the thermocouple is configured to be capable of protruding or sinking relative to an end portion of the guide portion, the operating portion includes a piston-side stopper disposed on the piston side of the sealing member, and a stopper mechanism is configured by an operating-portion-side stopper end provided on the piston-side stopper and a fixed stopper end facing the operating-portion-side stopper end in the axial direction, and a gap D1 between an end portion of the piston at the time of maximum sinking and the operating end portion of the piston-side stopper on which the piston acts and a gap D2 between the fixed stopper end and the operating-portion-side stopper end are D1 > D2.
2. The temperature-sensitive control valve according to claim 1,
a guide insertion hole through which the guide portion is inserted is formed in the piston-side stopper, an end portion of the guide portion constitutes the fixed stopper, and a bottom portion of the guide insertion hole constitutes the operation portion-side stopper.
3. The temperature-sensitive control valve according to claim 1,
a guide insertion hole through which the guide portion is inserted is formed in the piston-side stopper, the enlarged main body case portion of the thermocouple forms the fixed stopper end, and a surface of the piston-side stopper around an opening portion of the guide insertion hole forms the operation-portion-side stopper end.
4. The temperature-sensitive control valve according to claim 1,
the operating portion includes a cylindrical holding case portion that holds the thermocouple by enclosing at least the guide portion and the piston-side stopper, and a step portion formed in the holding case portion constitutes the fixed stopper end, and an end surface of the piston-side stopper on the fixed stopper end side constitutes the operating-portion-side stopper end.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-130576 | 2018-07-10 | ||
| JP2018130576A JP6863934B2 (en) | 2018-07-10 | 2018-07-10 | Temperature sensitive control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110701835A CN110701835A (en) | 2020-01-17 |
| CN110701835B true CN110701835B (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910537071.8A Active CN110701835B (en) | 2018-07-10 | 2019-06-20 | Temperature sensing type control valve |
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| Country | Link |
|---|---|
| JP (1) | JP6863934B2 (en) |
| CN (1) | CN110701835B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020008106A (en) | 2020-01-16 |
| CN110701835A (en) | 2020-01-17 |
| JP6863934B2 (en) | 2021-04-21 |
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