JP6863934B2 - Temperature sensitive control valve - Google Patents

Description

The present invention relates to a temperature-sensitive control valve that supplies a refrigerant to a cooling device or the like that cools a heat source.

Conventionally, for example, in the field of information processing, a system that generates a large amount of heat, 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 arranged with respect to a rack of a blade server to cool the inside of the rack. Further, Japanese Patent Application Laid-Open No. 52-103437 (Patent Document 2) discloses a thermoelement and a piston assembly suitable for sensing the temperature of a heat source.

JP-A-2009-224406 Jikkai Sho 52-103437 Gazette

In the technique of Patent Document 1, cooling is performed by cooling water (refrigerant), but in a device such as a server, the amount of heat generated greatly changes depending on the operating state. Therefore, as soon as the temperature of the heat source reaches the set temperature, it is required to open the valve port wide and cool it quickly. On the other hand, it is considered that the temperature of the heat source is sensed by the thermo element, and the operating force of the thermo element is applied to the operation unit 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 main body is provided in the piping for supplying the refrigerant of the cooling device, there are the following problems as an example. When charging the refrigerant supply piping with refrigerant, excessive pressure may be applied to the valve gear body through the piping. For example, a valve device as in Patent Document 2 is used to switch or stop the flow of the refrigerant depending on the temperature of the refrigerant for cooling the server. However, when the refrigerant is charged, an abnormal load may be applied to the thermoelement in the compression direction of the thermal expansion body through the shaft (8) of the thermoelement due to excessive pressure through the piping of the valve device to damage the thermoelement. There is.

The present invention is a temperature-sensitive control valve that is provided in a refrigerant supply pipe of a cooling device that cools a heat source that requires cooling, senses a temperature change of the heat source with a thermoelement, and supplies the refrigerant. The task is to prevent damage.

The temperature-sensitive control valve according to claim 1 is a thermostat having a piston that transmits a volume change of a heat-expanding body that expands and contracts in response to a temperature change, and a guide portion that slidably guides the piston in the axial direction. It is a valve device main body that opens and closes the element and the valve port through which the refrigerant flows with a valve body, and the structural part including the valve body is hermetically sealed with a sealing member and mechanical pressing force in the axial direction is applied. The sealing member includes a valve device main body having an operation unit that transmits to the valve body in the axial direction via the sealing member, and mechanical pressing force due to the axial movement of the piston of the thermo element. A temperature-sensitive control valve configured to open the valve port in the valve body, and the piston of the thermoelement can protrude and immerse from the end of the guide portion. The operation unit is provided with a piston side pad arranged on the piston side of the sealing member, and is provided on the operation unit side stopper end and the operation unit side stopper end provided on the piston side pad. On the other hand, the stopper means is formed by the fixed stopper ends facing each other in the axial direction, and the gap D1 between the end of the piston at the time of maximum immersion and the operating end of the piston side pad on which the piston acts, and the said. The gap D2 between the fixed stopper end and the stopper end on the operation unit side is
D1> D2
It is characterized in that it is configured to be.

The temperature-sensitive control valve according to claim 2 is the temperature-sensitive control valve according to claim 1, wherein a guide insertion hole through which the guide portion is inserted is formed in the piston side pad, and the guide portion is formed. The end portion constitutes the fixed stopper end, and the bottom portion of the guide insertion hole constitutes the operation portion side stopper end.

The temperature-sensitive control valve according to claim 3 is the temperature-sensitive control valve according to claim 1, wherein a guide insertion hole through which the guide portion is inserted is formed in the piston side pad, and the thermoelement is provided. The main body case portion whose diameter has been expanded constitutes the fixed stopper end, and the peripheral end surface of the guide portion in the piston side pad constitutes the operation portion side stopper end.

The temperature-sensitive control valve according to claim 4 is the temperature-sensitive control valve according to claim 1, wherein the operating portion includes at least the guide portion and the piston side pad to include the thermo element. A cylindrical holding case portion for holding is provided, and a step portion formed on the holding case portion constitutes the fixed stopper end, and an outer peripheral end surface of the piston side pad constitutes the operation portion side stopper end. It is characterized by that.

According to the temperature-sensitive control valves of claims 1 to 4, a high pressure is applied to the sealing member of the operation portion of the valve device main body, for example, when charging the refrigerant in the refrigerant supply piping of the cooling device. Even if the sealing member is displaced in the direction opposite to the action of the piston, the piston side contact is brought into contact with the fixed stopper end by the stopper means to prevent excessive displacement of the sealing member, and damage to the thermoelement can be prevented.

In addition, since the sealing member is provided, the thermo element is not in contact with the refrigerant due to this sealing member, so that even if an abnormally high pressure is applied to the valve device body when the refrigerant is charged, the rubber piston or diaphragm of the thermo element Abnormal deformation and destruction can be prevented. Further, when the refrigerant penetrates into the thermoelement, the volume of the fluid or the like may increase and the valve opening point may shift, or the rubber piston or diaphragm may swell or deteriorate. Can also be resolved.

According to the temperature-sensitive control valve of claim 2, since the guide portion of the thermo element is used as the fixed stopper end, the stopper means can be easily configured only by setting the depth of the guide insertion hole of the piston side pad. be able to.

According to the temperature-sensitive control valve of claim 3, the contact area of the stopper means can be increased, and the load is received in a wide area, so that the strength of the stopper means is increased. In addition, since the contact is made over a wide area, the piston side bearing is less likely to tilt.

According to the temperature-sensitive control valve of claim 4, since the position of the stopper means is not affected by the dimensions of the thermoelement, even if the dimensions of the thermoelement vary widely, the function of the stopper means can be reliably exerted. it can. Further, since the piston side pad has a large diameter up to the vicinity of the inner circumference of the cylindrical holding case portion, as a result, a load is received over a wide area, so that the strength of the stopper means is increased. In addition, since the contact is made over a wide area, it is difficult to tilt.

It is a vertical sectional view of the temperature sensitive control valve of embodiment of this invention. It is a top view of the temperature sensitive control valve of an embodiment. It is a vertical sectional view of the thermoelement in the temperature sensitive control valve of an embodiment. It is a figure which shows the temperature-displacement characteristic of the thermoelement in the temperature-sensitive control valve of an embodiment. It is an enlarged vertical sectional view of the main part at the time of the maximum immersion of the piston of the temperature sensitive control valve of an embodiment. It is an enlarged vertical sectional view of the main part at the time of piston protrusion of the temperature sensitive control valve of an embodiment. It is an enlarged vertical sectional view of the main part at the time of operation of the stopper means of the temperature sensitive control valve of embodiment. It is an enlarged vertical sectional view of the main part of the modification 1 of the temperature sensitive control valve of an embodiment. It is an enlarged vertical sectional view of the main part of the modification 2 of the temperature sensitive control valve of the embodiment.

Next, an embodiment of the temperature-sensitive control valve of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of the temperature-sensitive control valve of the embodiment, FIG. 2 is a top view of the temperature-sensitive control valve, and FIG. 3 is a vertical cross-sectional view of a thermoelement in the temperature-sensitive control valve. The concept of "upper and lower" in the following description corresponds to upper and lower in the drawings of FIGS. 1 and 3. Further, in the following description, the temperature-sensitive control valve of the embodiment is appropriately referred to as a "control valve".

The control valve 100 of the embodiment is composed of a valve device main body 10 and a thermoelement 20. The valve device main body 10 has a metal valve housing 1, and a columnar valve chamber 1A is formed in the center of the valve housing 1, and the refrigerant flows into the valve housing 1 by opening to the side portion of the valve chamber 1A. One port 11 is formed, and further, a second port 12 through which the refrigerant flows out is formed. Further, in the valve housing 1, a valve port 13 centered on the axis L is formed between the valve chamber 1A and the second port 12, and the second port from the upper part of the valve housing 1 is coaxial with the valve port 13. A guide hole 14 penetrating up to 12 is formed. The guide hole 14 has a cylindrical shape with the axis L of the valve port 13 as the central axis. The refrigerant may flow in from the second port 12 and flow out from the first port.

A valve body 3 is arranged in the valve chamber 1A, the second port 12, and the guide hole 14. The valve body 3 is composed of a cylindrical rod-shaped valve rod 3a, a substantially conical needle portion 3b that opens and closes the valve port 13 from the valve chamber 1A side, and a flange portion 3c formed on the outer periphery of the needle portion 3b. There is. The valve rod 3a is inserted into the guide hole 14, and a coil spring 32 is arranged between the flange portion 3c and the spring receiver 31 at the bottom of the valve chamber 1A. As a result, the coil spring 32 urges the valve body 3 toward the diaphragm 43, which will be described later.

An operation unit 4 is attached to the side of the valve housing 1 opposite to the valve chamber 1A. The operation unit 4 is a diaphragm as a "sealing member" arranged between the lower lid 41 fixed to the valve housing 1, the upper case 42 having the same diameter as the lower lid 41, and the lower lid 41 and the upper case 42. 43, a lower allowance 44 as a "valve side allowance" arranged between the diaphragm 43 and the valve rod 3a of the valve body 3 in the lower lid 41, and an arrangement on the diaphragm 43 in the upper case 42. It is composed of an upper allowance 45 as a "piston side allowance". The lower lid 41, the diaphragm 43, and the upper case 42 are welded and integrally joined at the outer peripheral edge portion. As shown in the top view of FIG. 2, the valve housing 1 has a rectangular shape, but the upper case 42 (and the lower lid 41, the diaphragm 43) and the thermoelement 20 have a rotationally symmetric shape around the axis L. The diaphragm 43 is an annular shape made of thin film metal, and has a flat flange surface on the outer peripheral portion and a flat contact surface in contact with the upper and lower deposits 44 on each surface at the center. It is formed, and a corrugated annular portion is formed between the flange surface of the outer peripheral portion and the contact surface of the central portion. The contact surface is an action surface that applies a mechanical pressing force in the L direction of the axis to the valve body 3 via the diaphragm 43.

The lower allowance 44 has a larger contact area of the lower allowance 44 with the diaphragm 43 than the area of the tip surface of the valve stem 3a on the diaphragm 43 side. As a result, as described later, when the diaphragm 43 is deformed by the action of the thermoelement 20 and the pressing force is transmitted to the valve stem 3a, the reaction force received from the valve stem 3a is applied to the diaphragm 43 over a wide area of the lower allowance 44. On the other hand, it can be dispersed, and the durability of the diaphragm 43 can be improved. Similarly, in the upper deposit 45, the contact area of the upper deposit 45 with the diaphragm 43 is larger than the area of the tip surface of the piston 23 on the diaphragm 43 side, which will be described later. As a result, the pressing force can be dispersed and transmitted to the diaphragm 43 in a wider area of the upper deposit 45 than when the piston 23 directly contacts the diaphragm 43, and the durability of the diaphragm 43 can be improved.

As a result, in the operation unit 4, the diaphragm 43 and the lower lid 41 hermetically seal the structural portion including the lower deposit 44 and the valve stem 3a, and from the upper deposit 45 outside the diaphragm 43, that is, in the upper case 42. It has a function of transmitting the mechanical pressing force in the axis L direction to the valve body 3 (valve rod 3a) via the diaphragm 43 and the lower deposit 44. Then, the thermo element 20 (a part thereof) is housed in the cylindrical portion 42a as the "holding case portion" of the upper case 42 of the operation portion 4, and the temperature sensitive portion 21a of the thermo element 20 is housed from the upper end of the upper case 42. At the same time, the locking piece 42a1 at the end of the cylindrical portion 42a is engaged with the end of the thermoelement 20 on the temperature-sensitive portion 21a side of the temperature-sensitive portion side base portion 21b.

The thermoelement 20 is a thermoactuator that utilizes expansion and contraction of paraffin and the like due to temperature changes. As shown in FIG. 3, the thermoelement 20 includes a temperature sensitive case 21, a guide case 22, a piston 23, a diaphragm 24, a rubber piston 25, and a protective plate 26. The temperature-sensitive case 21 is composed of a cylindrical temperature-sensitive portion 21a having a bottom at an end and a temperature-sensitive portion side base portion 21b that covers a part of the guide case 22. The guide case 22 is composed of a cylindrical guide portion 22a in which the piston 23, the rubber piston 25 and the protective plate 26 are inserted, and a guide side base portion 22b covered with the temperature sensing portion side base portion 21b of the temperature sensing case 21. There is.

The temperature-sensitive portion 21a of the temperature-sensitive case 21 is filled with a thermal expansion body 2A made of wax such as paraffin, and the lower end surface of the thermal expansion body 2A is sealed by a diaphragm 24 which is an elastic sealing member. There is. A fluid chamber is provided between the mortar-shaped inner surface 22b1 of the guide side base 22b of the guide case 22 and the lower side of the diaphragm 24, and the fluid chamber is filled with the fluid 2B. The fluid 2B is an incompressible fluid having good fluidity and lubricity. The piston 23 is slidably inserted into the piston sliding hole 22a1 inside the guide portion 22a of the guide case 22 via the rubber piston 25 and the protective plate 26, and the outer end portion of the piston 23 is a piston slide. It protrudes from the moving hole 22a1.

When the environmental temperature of the temperature sensitive portion 21a rises, the thermal expansion body 2A expands and the diaphragm 24 swells, pushing down the fluid 2B enclosed in the fluid chamber below the diaphragm 24. As a result, the fluid 2B is deformed and a part thereof enters the piston sliding hole 22a1 of the guide portion 22a, and pushes the piston 23 downward through the rubber piston 25 and the protective plate 26.

As shown in FIG. 1, the play hole 45a, the guide insertion hole 45b, and the spring accommodating hole 45c are coaxially formed in the upper allowance 45, and the piston 23 of the thermoelement 20 faces the play hole 45a. The guide portion 22a is inserted into the guide insertion hole 45b. A fixed spring 46 is arranged on the outer circumference of the guide portion 22a, and the fixed spring 46 is compressed and arranged between the temperature-sensitive portion side base portion 21b in the cylindrical portion 42a and the bottom portion of the spring accommodating hole 45c. Has been done. That is, since the end portion of the temperature sensitive portion side base portion 21b is engaged with the locking piece 42a1 of the cylindrical portion 42a as described above, the thermoelement 20 is fixed to the cylindrical portion 42a by the spring force of the fixing spring 46. ing. Further, the temperature sensitive portion 21a of the thermoelement 20 projects in a columnar shape, and has a structure that can be easily attached to the temperature sensing target. Then, the temperature sensitive portion 21a is mounted in the mounting hole 50a of the metal plate 50, and the heat from the metal plate 50 is transferred to the temperature sensitive portion 21a. The metal plate 50 is in close contact with a heat source (not shown).

With the above configuration, when the temperature of the temperature sensitive portion 21a of the thermoelement 20 rises and the piston 23 descends as described above from the state of FIG. 1, the piston 23 comes into contact with the upper deposit 45 (the bottom of the play hole 45a). .. Further, when the piston 23 is lowered, the upper allowance 45 is lowered, the diaphragm 43 is deformed, the lower allowance 44 is lowered, and the valve body 3 in contact with the lower allowance 44 is further lowered. As described above, in this embodiment, the moment when the pressing force of the piston 23 starts to be applied to the valve body 3 via the upper allowance 45, the diaphragm 43, and the lower allowance 44 is the "valve opening point", and this valve opening point. The needle portion 3b of the valve body 3 is separated from the periphery of the valve port 13 to open the valve port 13.

FIG. 4 is a diagram showing a temperature-displacement characteristic showing the relationship between the temperature of the temperature sensitive portion 21a in the thermoelement 20 and the displacement (lift) of the piston 23. The thermal expander 2A in the temperature sensitive portion 21a undergoes a phase change depending on the temperature, such as a solid state, a solid-liquid mixed state in which a solid and a liquid are mixed, and a liquid state. As a result, the temperature-displacement characteristics are divided into a "solid expansion region" that expands in the solid state, a "solid-liquid mixed expansion region" that expands in the solid-liquid mixed state, and a "liquid expansion region" that expands in the liquid state. Each exhibits a different inclination. Then, the inclination in the solid-liquid mixed expansion region, that is, the coefficient of thermal expansion becomes the largest (steep). This temperature-displacement characteristic is known as an inherent characteristic of the thermoelement 20, and in this case, the range of the lifts L1 to L3 of the piston 23 corresponds to the “solid-liquid mixed expansion region”.

Here, as described above, the valve opening point in the valve device main body 10 is set to be within the range of the "solid-liquid mixing expansion region". In this embodiment, the valve opening points are set to the states of "valve opening lift = 0" and "thermo element lift = L2" shown in FIG. In this way, since the valve opening point is set within the range of the "solid-liquid mixed expansion region" in which the coefficient of thermal expansion of the thermal expansion body 2A in the thermoelement 20 is large, when the heat source reaches the set temperature, the valve port 13 can be opened wide quickly. As a result, the refrigerant can be quickly supplied to a cooling device (not shown) in accordance with the temperature change of the heat source, and as a result, the heat source can be quickly cooled.

In the thermoelement 20, when the temperature of the temperature sensitive portion 21a drops and the thermal expansion body 2A contracts, the diaphragm 24 does not move and a vacuum gap is formed in the solidified thermal expansion body 2A, or a fluid. There may be voids in 2B. Further, the diaphragm 24 may be deformed due to the contraction in the thermal expansion body 2A, and the fluid body 2B may also change its shape. In such a case, the piston 23 is in a protruding state, and the rubber piston 25 and the protective plate 26 are also in a state of being stopped on the piston 23 side, or only the rubber piston 25 is in a state of moving following the fluid 2B. , The rubber piston 25 and the protective plate 26 may be in a state of moving following the fluid 2B. In either case, when the piston 23 is projected and stopped, the piston 23 does not apply a pressing force to the operating portion 4 (or the valve body 3), which is different from the "valve opening point" in the present invention. It is in a state.

As shown in FIGS. 5 and 6, in the upper allowance 45, the bottom portion of the play hole 45a facing the piston 23 is the operating end portion P on which the piston 23 acts. Further, the bottom portion (annular bottom portion) of the guide insertion hole 45b into which the guide portion 22a is inserted is the operation portion side stopper end 4T1. Further, the end portion of the guide portion 22a is a fixed stopper end ST1 that faces the operation portion side stopper end 4T1 in the axis L direction. The stopper end 4T1 on the operation portion side and the fixed stopper end ST1 form a "stopper means" that regulates the rise of the upper deposit 45 by the guide portion 22a. Further, at the time of maximum immersion when the piston 23 shown in FIG. 5 is most immersed in the guide portion 22a, the width “D1” of the gap between the end portion of the piston 23 and the operation end portion P, the fixed stopper end ST1 and the operation portion What is the width "D2" of the gap with the side stopper end 4T1?
D1> D2
It has become.

As a result, as shown in FIG. 7, even if an excessive pressure is applied to the diaphragm 43, the operation end portion P of the upper deposit 45 does not abut on the piston 23, and the operation portion side stopper end 4T1 is fixed at the stopper end ST1. The further rise of the upper deposit 45 is regulated. Therefore, it is possible to prevent the thermo element 20 from being damaged.

The "maximum immersion" of the piston 23 is as follows. The thermal expansion body 2A is in a solid state in the solid expansion region (the temperature of the thermal expansion body is normal temperature when the refrigerant is charged). Further, a gap may be formed between the piston 23 and the protective plate 26, between the protective plate 26 and the rubber piston 25, and inside the thermal expansion body 2A and the fluid body 2B. In the solid expansion region of the thermal expansion body, the state without this gap is the "maximum immersion". For example, FIG. 6 shows a state in which a gap is formed in the thermal expansion body 2A, and the piston 23 protrudes by the amount of the gap. Since this gap is a vacuum, an abnormal pressure is generated from this state due to charging of the refrigerant or the like, and even if the piston 23 moves upward due to this abnormal pressure, the thermal expander 2A is used until the vacuum gap disappears. No pressure is generated inside. That is, the thermal expansion body 2A does not enter the liquid compression state until the piston 23 reaches the maximum immersion state. Therefore, even in such a case, the thermo element 20 is not damaged.

FIG. 8 is an enlarged vertical cross-sectional view of a main part of the modified example 1 of the temperature-sensitive control valve of the embodiment, and FIG. 9 is an enlarged vertical cross-sectional view of a main part of the modified example 2 of the temperature-sensitive control valve of the embodiment. In the modified example, the same elements as those in the embodiment are designated by the same reference numerals as those in FIGS. 1 to 3 and 5 to 7, and the overlapping description will be omitted as appropriate.

In the first modification of FIG. 8, the upper allowance 45'as the "piston side allowance" is higher in the axis L direction than the upper allowance 45 of the embodiment. A guide insertion hole 45b'and a spring accommodating hole 45c' are coaxially formed in the upper deposit 45', and the piston 23 faces the guide insertion hole 45b'and the guide portion 22a is inserted. Further, the bottom portion of the guide insertion hole 45b'is the operating end portion P on which the piston 23 acts. Further, in the temperature sensitive portion side base portion 21 which is the “diameter-enlarged main body case portion” of the thermo element 20, the surface on the upper portion 45'side is the fixed stopper end ST2. Further, the peripheral end surface of the guide portion 22a in the upper deposit 45'is the operation portion side stopper end 4T2.

Then, at the time of maximum immersion when the piston 23 is most immersed in the guide portion 22a, the width "D1" of the gap between the end portion of the piston 23 and the operation end portion P, the fixed stopper end ST2, and the operation portion side stopper end 4T2 What is the width of the gap "D2"?
D1> D2
It has become. In this modification 1, as in the embodiment, even if an excessive pressure is applied to the diaphragm 43, the operation end portion P of the upper deposit 45'does not come into contact with the piston 23, and the operation portion side stopper end 4T2 is fixed. It comes into contact with the stopper end ST2, and further increase of the upper deposit 45'is restricted. Therefore, it is possible to prevent the thermo element 20 from being damaged.

In the second modification of FIG. 9, the upper allowance 45 ″ as the “piston side allowance” has a larger diameter than the upper allowance 45 of the embodiment. The upper allowance 45 ″ has a guide insertion hole 45b ″ and a spring accommodating hole. 45c "is formed coaxially, the piston 23 faces the guide insertion hole 45b", and the guide portion 22a is inserted. Further, the bottom of the guide insertion hole 45b "is the operating end on which the piston 23 acts. It is part P. Further, a step portion 42a1 is formed in the cylindrical portion 42a as the "holding case portion", and the inner surface of the step portion 42a1 on the upper deposit 45 "side is the fixed stopper end ST3. Further, the upper deposit 45" is formed. The upper end surface facing the fixed stopper end ST3 is the operation unit side stopper end 4T3.

Then, at the time of maximum immersion when the piston 23 is most immersed in the guide portion 22a, the width "D1" of the gap between the end portion of the piston 23 and the operation end portion P, the fixed stopper end ST3, and the operation portion side stopper end 4T3 What is the width of the gap "D2"?
D1> D2
It has become. In this modification 2, as in the embodiment, even if an excessive pressure is applied to the diaphragm 43, the operation end portion P of the upper deposit 45 ″ does not abut on the piston 23, and the operation portion side stopper end 4T3 is fixed. It comes into contact with the stopper end ST3, and further increase of the upper deposit 45 ″ is restricted. Therefore, it is possible to prevent the thermo element 20 from being damaged.

The thermoelement in the embodiment includes a rubber piston, a protective plate and a fluid, which may be absent. The thermoelement may be any one that transmits the volume change of the thermal expansion body to the piston.

Further, in the embodiment, an example in which the "sealing member" of the operation portion is composed of the diaphragm 43 has been described, but the "sealing member" includes a structural portion including a lower deposit and a valve body, which is sealed and sealed. If so, for example, bellows or the like may be used.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and design changes and the like within a range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention.

For example, not only the valve body comes into contact with the valve seat around the valve port and the valve port is completely closed, but there is a gap or a flow path between the valve body and the valve seat, and there is a slight bleed flow rate. It may be the case. That is, in the present invention, the "closed state" of the valve port is a concept including the case where the valve port is completely closed and the case where there is a bleed flow rate.

1 Valve housing 1A Valve chamber 11 1st port 12 2nd port 13 Valve port 14 Guide hole L Axis line 21 Temperature sensitive case 21a Temperature sensitive part 21b Temperature sensitive part side base 22 Guide case 22a Guide part 22b Guide side base 23 Piston 24 Diaphragm 25 Rubber piston 26 Protective plate 2A Thermal expansion body 2B Fluid 3 Valve body 3a Valve rod 3b Needle part 3c Collar part 3a'Valve rod 31 Spring receiver 32 Coil spring 4 Operation part 41 Lower lid 42 Upper case 42a Cylindrical part 42a1 Step part 43 Diaphragm 44 Lower allowance (valve side allowance)
45 Top allowance (piston side allowance)
45'upper allowance (piston side allowance)
45 ″ upper allowance (piston side allowance)
46 Fixed spring 47 Coil spring 45a Play hole 45b Guide insertion hole 45b ′ Guide insertion hole 45b ″ Guide insertion hole 45c Spring accommodation hole 45c ′ Spring accommodation hole 45c ″ Spring accommodation hole 4 ′ Operation part 44 ′ Money)
44a'Play hole 45'Upper allowance (piston side allowance)
45a'Piston hole P Operation end ST1 Fixed stopper end ST2 Fixed stopper end ST3 Fixed stopper end 4T1 Operation part side stopper end 4T2 Operation part side stopper end 4T3 Operation part side stopper end 10 Valve device body 20 Thermoelement 100 Temperature sensitive control valve

Claims (4)

A thermoelement having a piston that transmits a volume change of a thermal expansion body that expands and contracts in response to a temperature change, and a guide portion that slidably guides the piston in the axial direction.
A valve device body that opens and closes a valve port through which refrigerant flows with a valve body. The structural portion including the valve body is hermetically sealed with a sealing member, and the mechanical pressing force in the axial direction is applied to the sealing member. A valve device main body having an operation unit that transmits to the valve body in the axial direction via
With
A temperature-sensitive control valve configured to open the valve port in the valve body by applying a mechanical pressing force due to the axial movement of the piston of the thermoelement to the sealing member. And
The piston of the thermo element is provided so as to protrude and immerse from the end of the guide portion, and the operating portion includes a piston side allowance arranged on the piston side of the sealing member and the piston side allowance. The stopper means is composed of the stopper end on the operation portion side provided in the above and the fixed stopper end facing the stopper end on the operation portion side in the axial direction, and the end portion at the time of maximum immersion of the piston and the piston The gap D1 between the operating end of the piston-side pad that acts and the gap D2 between the fixed stopper end and the operating end of the operating portion are
D1> D2
A temperature-sensitive control valve characterized in that it is configured to be. A guide insertion hole through which the guide portion is inserted is formed in the piston side pad, the end portion of the guide portion constitutes the fixed stopper end, and the bottom portion of the guide insertion hole constitutes the operation portion side stopper end. The temperature-sensitive control valve according to claim 1, wherein the temperature-sensitive control valve is provided. A guide insertion hole through which the guide portion is inserted is formed in the piston side pad, and the enlarged main body case portion of the thermo element holds the fixed stopper end, and the opening of the guide insertion hole in the piston side pad. The temperature-sensitive control valve according to claim 1, wherein a surface around the portion constitutes each of the stopper ends on the operation portion side. The operation portion includes at least the guide portion and the piston side pad to hold the thermo element, and the step portion formed on the holding case portion is the fixing stopper. The temperature-sensitive control valve according to claim 1, wherein the end surface of the piston-side bearing on the fixed stopper end side constitutes the operation portion-side stopper end, respectively.

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