CN217842696U

CN217842696U - Flow rate adjustment valve and cooling device

Info

Publication number: CN217842696U
Application number: CN202222237554.6U
Authority: CN
Inventors: 横田纯一
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2021-09-06
Filing date: 2022-08-24
Publication date: 2022-11-18
Anticipated expiration: 2032-08-24
Also published as: JP7466508B2; JP2023037897A

Abstract

The utility model provides a can restrain flow control valve and cooling device that corrodes. Since the entire transmission member (75) in contact with the diaphragm (73) in the third space (A3) into which the refrigerant is introduced is made of the same metal as the diaphragm (73), even when a conductive fluid is used as the refrigerant, the occurrence of a potential difference due to the contact of different metals can be suppressed, and corrosion of the transmission member (75) and the diaphragm (73) can be suppressed.

Description

Flow rate adjustment valve and cooling device

Technical Field

The utility model relates to a flow control valve and cooling device.

Background

In general, in a cooling device that cools a cooling target using a refrigerant (fluid), a structure in which the cooling capacity changes depending on the temperature of the cooling target is sometimes employed. As such a cooling device, a device provided with a flow rate adjustment valve that adjusts the valve opening degree in accordance with the pressure of the working fluid has been proposed (see, for example, patent document 1). In the cooling device described in patent document 1, the diaphragm is displaced by a pressure difference between the working fluid on the upstream side and the working fluid on the downstream side of the cooler, and the flow rate regulating valve is moved to regulate the flow rate of the working fluid flowing through the cooler.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2006-038302

SUMMERY OF THE UTILITY MODEL

Problems to be solved by the utility model

However, in the cooling device described in patent document 1, since a pressure type adjustment method of moving the valve by using a pressure difference of the working fluid is adopted, for example, when a pressure change of the working fluid with respect to a temperature change is small, when a pressure loss in a flow path from an upstream side of the cooler to the diaphragm is large, or the like, there is a possibility that responsiveness of a valve opening degree (that is, responsiveness of cooling capacity) with respect to a temperature change of a cooling target becomes low. Therefore, the following method (flow rate adjusting method of temperature detection system) is considered: the valve opening is adjusted by using a gas for valve opening adjustment different from the working fluid and changing the pressure of the gas for valve opening adjustment in accordance with the temperature change of the cooling target.

In such a flow rate adjusting method of the temperature detection system, a space into which the working fluid (refrigerant) is introduced and a space into which the gas for adjusting the valve opening degree are introduced are partitioned by the diaphragm, and when the temperature of the space into which the gas is introduced increases, the pressure in the space increases, and a valve opening force is applied from the diaphragm to the valve body, thereby increasing the valve opening degree. In this case, it is difficult to dispose the diaphragm close to the valve body, and a transmission member for transmitting the valve opening force needs to be provided in a space through which the refrigerant passes. However, when a conductive fluid such as water is used as the refrigerant, if the transmission members made of metals different from each other are in contact with the diaphragm, a potential difference may be generated between the metals, and corrosion may occur.

An object of the utility model is to provide a flow control valve and cooling device that can restrain corruption.

Means for solving the problems

The utility model discloses a flow control valve is the flow control valve who adjusts the flow of the refrigerant that passes through according to the temperature of cooling object, its characterized in that possesses: a primary port for introducing the refrigerant; a valve body having a valve port through which the refrigerant flowing from the primary port passes; a valve element movably provided in the valve body and changing an opening degree of the valve port; a secondary port for sending out the refrigerant passing through the valve port; valve closing force applying means for applying a predetermined valve closing force to the valve body; and a drive element for driving the valve element, the drive element including: a first housing portion that forms an enclosed space enclosing an enclosed gas and receives heat from the cooling target; a second casing section forming a space for introducing the refrigerant; a metal diaphragm provided between the first case and the second case and defining a space; and a transmission member that is in contact with the diaphragm in a space into which the refrigerant is introduced and is capable of transmitting a valve opening force to the valve body, wherein at least a contact portion of the transmission member that is in contact with the diaphragm is made of a metal or a resin of the same type as that of the diaphragm.

According to the present invention as described above, at least the contact portion of the transmission member that is in contact with the diaphragm in the space into which the refrigerant is introduced is made of the same metal or resin as the type of the diaphragm, so that even when the conductive fluid is used as the refrigerant, the occurrence of a potential difference due to the contact of different types of metals can be suppressed, and corrosion of the transmission member and the diaphragm can be suppressed. The "same kind of metal" means that the main constituent metals are the same, and there may be some difference in the additive. Specifically, if stainless steel is used which mainly contains chromium and nickel (and iron) as constituent metals, such as chromium-nickel stainless steel, some difference in addition may be present, such as a combination of SUS304 and SUS 316.

In this case, in the flow rate adjustment valve of the present invention, it is preferable that the entire transmission member is made of metal or resin of the same type as that of the diaphragm. According to this structure, the transmission member is entirely made of one material, and can be easily manufactured. Further, when the transmission member is made of metal, the load resistance of the transmission member can be easily ensured, and when the transmission member is made of resin, the cost can be reduced.

In the flow rate adjusting valve according to the present invention, the base portion of the transmission member may be made of metal, and the surface of the contact portion may be made of metal or resin of the same type as that of the diaphragm. With this configuration, the generation of a potential difference at the contact portion can be suppressed, and the degree of freedom in selecting the material of the base portion can be improved. For example, the diaphragm is required to be easily deformed and the transmission member is required to have high rigidity in some cases, but in such a case, the required characteristics are easily ensured by forming the diaphragm from different kinds of metals. Further, the base portion is made of metal, so that load resistance is easily ensured as described above.

In the flow rate regulating valve according to the present invention, it is preferable that the valve body has a cylindrical portion through which the extension portion can pass, and a tip end of the cylindrical portion abuts against the other surface side of the plate portion, so that the movement of the transmission member to the valve opening side is regulated.

According to this configuration, the plate portion is urged by abutting the tube portion on the other surface side, and is urged by abutting the extension portion and is urged by abutting the diaphragm on the one surface side. Therefore, even when the movement of the transmission member is restricted or when the force is transmitted from the transmission member to the valve body, the force acts on substantially the same portion of the plate portion from both sides, and the shear stress to the plate portion can be reduced. In contrast, for example, in a structure in which a force is applied from the diaphragm to the central portion of the transmission member and the movement of the valve body is restricted by the end portion of the transmission member coming into contact with the valve body, a shear stress is likely to occur due to a positional deviation of the force application. Further, by reducing the shear stress as described above, even when the transmission member is made of resin or the like and the load resistance is reduced, the thickness can be reduced, and the increase in size of the transmission member can be suppressed.

The cooling device of the present invention is characterized by comprising any one of the flow rate adjustment valves described above, a transport fluid unit that sends out the refrigerant in a predetermined direction, a heat radiation unit that radiates the refrigerant, and a heat receiving unit that allows the refrigerant to pass therethrough and receives heat from the object to be cooled, and the refrigerant is circulated through a flow path connecting the flow rate adjustment valve, the transport fluid unit, and the heat radiation unit. According to the present invention, similarly to the flow rate adjustment valve described above, corrosion of the transmission member and the diaphragm can be suppressed.

Specifically, the scheme of the utility model is as follows respectively.

One aspect of the present invention is a flow rate adjustment valve for adjusting a flow rate of a refrigerant passing therethrough in accordance with a temperature of a cooling target, the flow rate adjustment valve including: a primary port for introducing the refrigerant; a valve main body having a valve port through which the refrigerant flowing from the primary port passes; a valve element movably provided in the valve body and changing an opening degree of the valve port; a secondary port for sending out the refrigerant passing through the valve port; valve closing force applying means for applying a predetermined valve closing force to the valve body; and a drive element for driving the valve element,

the drive element includes: a first housing portion forming an enclosed space enclosing an enclosed gas and receiving heat from the cooling object; a second casing section forming a space for introducing the refrigerant; a metal diaphragm provided between the first case and the second case and defining a space; and a transmission member that is in contact with the diaphragm in a space into which the refrigerant is introduced and is capable of transmitting a valve opening force to the valve body,

at least a contact portion of the transmission member, which contacts the diaphragm, is made of a metal or a resin of the same kind as that of the diaphragm.

A flow rate adjustment valve according to a second aspect of the present invention is the flow rate adjustment valve according to the first aspect, wherein the entire transmission member is made of a metal or a resin of the same kind as that of the diaphragm.

A third aspect of the present invention is a flow rate adjustment valve according to the first aspect, wherein the base portion of the transmission member is made of metal, and a surface of the contact portion is made of metal or resin of the same kind as that of the diaphragm.

A fourth aspect is a flow rate adjustment valve according to any one of the first to third aspects,

the valve body has an extension portion extending toward the transmission member through the valve port,

the transmission member has a plate portion provided with the contact portion on one surface side and abutting the extension portion on the other surface side,

the valve body has a cylindrical portion through which the extension portion can pass, and the transmission member is restricted from moving to the valve opening side by bringing a distal end of the cylindrical portion into contact with the other surface side of the plate portion.

A fifth aspect of the present invention is a cooling device including the flow rate adjustment valve according to any one of the first to fourth aspects, a transport fluid unit that sends out the refrigerant in a predetermined direction, a heat radiation unit that radiates the refrigerant, and a heat receiving unit that allows the refrigerant to pass therethrough and receives heat from the cooling target, wherein the refrigerant is circulated through a flow path that connects the flow rate adjustment valve, the transport fluid unit, and the heat radiation unit.

The utility model has the following effects.

According to the valve device of the present invention, even when the conductive fluid is used as the refrigerant, corrosion of the transmission member and the diaphragm can be suppressed.

Drawings

Fig. 1 is a system diagram showing a cooling device according to an embodiment of the present invention.

Fig. 2 is a sectional view showing a flow rate adjustment valve provided in the cooling device.

Fig. 3 is an enlarged cross-sectional view of a main portion of the flow rate adjustment valve.

Fig. 4 is an enlarged cross-sectional view of a main portion of a flow rate adjustment valve according to a modification of the present invention.

Description of the symbols

1-flow rate adjustment valve, 2-housing (valve body), 211-primary port, 212-secondary port, 216-valve port, 218-cylinder portion, 218A-front end, 5-valve element, 53-extension portion, 6-compression spring (valve closing force applying unit), 7-driving element, 71-first housing portion, 72-second housing portion, 73-diaphragm, 75-transmission member, 751A-plate portion, 754-contact portion, 101-pump (transport fluid unit), 102-radiator (heat radiating unit), 103-cooler (heat receiving portion), 201-204-cooling object, A3-third space, A4-enclosed space.

Detailed Description

Embodiments of the present invention will be described with reference to the drawings. As shown in fig. 1, a cooling device 100 of the present embodiment includes four flow rate adjustment valves 1, a pump 101 as a transport fluid unit that sends out a refrigerant in a predetermined direction, a radiator 102 as a heat radiation unit that radiates heat from the refrigerant, and four coolers (e.g., cold plates) 103 as heat receiving portions, and forms a flow path through which the refrigerant circulates. This cooling device 100 cools electric equipment mounted on an electric vehicle, a hybrid vehicle, or the like, using a conductive refrigerant such as water, for example. That is, a motor, an inverter, and other heat generating devices accompanied by heat generation are mounted on an electric vehicle or a hybrid vehicle, and cooling device 100 cools the heat generating devices. Alternatively, electronic devices mounted on a large computer system, a server, or the like are cooled. That is, a heat generating device having a large heat generation amount, such as a CPU or a memory, is mounted on a large computer system, a server, or the like, and the cooling device 100 cools the heat generating device. The plurality of heat generating devices are understood as one unit (cooling target), and in the example shown in fig. 1, the cooling apparatus 100 is configured to cool four cooling targets 201 to 204. The number of cooling targets to be cooled by the cooling device is arbitrary, but it is preferable that the flow rate adjustment valves and the coolers are provided in the same number as the number of cooling targets. As the refrigerant, an insulating refrigerant such as pure water or a fluorine-based inert liquid (for example, fluorinert (registered trademark), galden (registered trademark), novec (registered trademark)) may be used.

The cooler 103 and the flow rate adjustment valve 1 are provided for each of the four cooling targets 201 to 204, and the four flow rate adjustment valves 1 are connected in parallel. The refrigerant sent out by the pump 101 passes through the cooler 103 provided so as to contact the objects to be cooled 201 to 204, exchanges heat with the objects to be cooled 201 to 204, passes through the flow rate adjustment valve 1, is radiated by the radiator 102, and returns to the pump 101 again. The cooler 103 may be configured to function as a heat receiving unit by passing a refrigerant therethrough and receiving heat from the cooling targets 201 to 204, and may be configured to be capable of sufficiently transferring heat from the cooling targets 201 to 204 to the refrigerant. That is, the cooler 103 may be in direct contact with the cooling objects 201 to 204, or may conduct heat from the cooling objects 201 to 204 to the cooler 103 via a heat-conducting member. At this time, the flow rate of the refrigerant passing through each cooler 103 is adjusted by the flow rate adjustment valve 1 as described below, and more refrigerant flows to the coolers 103 provided for the cooling objects 201 to 204 having higher temperatures. In the example shown in fig. 1, the temperature of the object 201 is relatively high, and the flow rate of the refrigerant passing through the cooler 103 provided for the object 201 is increased. The flow rate of the refrigerant sent by the pump 101 may be adjusted based on the total heat generation amount of the cooling targets 201 to 204.

As the pump 101, a pump for sending out a refrigerant in a liquid state (liquid refrigerant) is preferably used. At this time, the refrigerant passing through the cooler 103 and the flow rate adjustment valve 1 is preferably liquid, but the refrigerant may be in a gas-liquid mixed state in a part of the flow path of the cooling device 100. The heat sink 102 may be a natural heat dissipation system, an air-blowing heat dissipation system, or a water-cooling system.

The detailed structure of the flow rate adjustment valve 1 will be described below. As shown in fig. 2, the flow rate adjustment valve 1 includes a housing 2 as a valve main body, a primary side conduit 3, a secondary side conduit 4, a valve body 5, a compression spring 6 as valve closing force applying means for applying a force in a valve closing direction to the valve body 5, and a drive element 7. The primary-side duct 3 and the secondary-side duct 4 extend in parallel, and the extending direction thereof is defined as an X direction, and two directions orthogonal to the X direction are defined as a Y direction and a Z direction.

The case 2 includes a case main body 21 and a lid 22. The case main body 21 is integrally formed of a metal member, and includes: a primary port 211 that opens on one side in the X direction (the right side in fig. 2); a secondary port 212 opened on the other side in the X direction (left side in fig. 2); an opening portion 213 that is open on the upper side in the Z direction in fig. 2 (hereinafter sometimes simply referred to as "upper side"); a first partition wall portion 214 and a second partition wall portion 215 extending between the primary port 211 and the secondary port 212; a valve port 216 and a communication hole 217 formed in the first partition portion 214; a cylindrical portion (guide portion) 218 protruding from the second partition wall portion 215 to the lower side in the Z direction in fig. 2 (hereinafter sometimes simply referred to as "lower side"); and a communication hole 219 formed in the second partition wall portion 215.

The center portions of the primary port 211 and the secondary port 212 are disposed offset from each other in the Z direction, and the center portion of the primary port 211 is disposed on the upper side. The primary port 211 is connected to the primary duct 3, and the secondary port 212 is connected to the secondary duct 4.

The opening 213 is formed to dispose the valve body 5 and the compression spring 6 in the case main body 21, and is closed by the lid body 22. The lid 22 may be fixed to the case body 21 in an airtight manner by brazing, welding, or the like.

The first partition wall portion 214 is formed in a plate shape extending along the XY plane between the lower end portion of the primary port 211 and the upper end portion of the secondary port 212. The second partition wall 215 extends substantially parallel to the first partition wall 214, and is disposed below the first partition wall with a space therebetween. A first space A1 and a second space A2 are formed in the housing main body 21. The first space A1 is a space communicating with the primary port 211, and houses a needle portion 52 described below in the valve body 5. The second space A2 is a space communicating with the secondary port 212, and the refrigerant after passing through the valve port 216 flows out. The first space A1 is formed above the first partition wall 214, and the second space A2 is formed between the first partition wall 214 and the second partition wall 215.

The valve port 216 is a through hole formed in the first partition portion 214 so as to allow the refrigerant flowing in from the primary port 211 to pass therethrough and to communicate the first space A1 with the second space A2. The communication hole 217 is formed on the secondary port 212 side with respect to the valve port 216 in the X direction, and constantly communicates the first space A1 with the second space A2. That is, the case 2 has a flow path through which the refrigerant can pass between the primary port 211 and the secondary port 212 even when the valve body 5 is seated on the seat portion 216A around the valve port 216 and is in the fully closed state.

The cylindrical portion 218 is formed in a cylindrical shape, and has an inner peripheral surface serving as a guide surface for guiding the extension portion 53 described below and an outer peripheral surface serving as a guide surface for guiding the transmission member 75 described below. The communication hole 219 is formed at a position overlapping the communication hole 217 formed in the first partition wall portion 214 when viewed in the Z direction, and communicates the second space A2 with a space (a third space A3 described below) below the second partition wall portion 215, thereby functioning as a pressure equalizing hole.

The valve body 5 is provided movably in the housing 2 to change the opening degree of the valve port 216, and includes a spring holder portion 51 formed on the upper surface, a needle portion 52 formed on the lower side, and an extension portion 53 extending downward from the tip of the needle portion 52. The spring holder 51 is a portion that comes into contact with the compression spring 6 and applies a valve closing force (urging force) to the lower side in the Z direction. The needle portion 52 is formed in a truncated cone shape so that the tip thereof becomes narrower toward the lower side, and the opening degree of the valve port 216 (valve opening degree) is adjusted by approaching or separating from the valve seat portion 216A. The extension portion 53 is a rod-shaped portion having a circular cross section, extends toward the transmission member 75 described below through the valve port 216, and is inserted into the cylindrical portion 218. Since the outer diameter of the extended portion 53 is slightly smaller than the inner diameter of the cylindrical portion 218, the extended portion 53 is guided by the inner circumferential surface of the cylindrical portion 218, and the valve body 5 moves in the Z direction.

The compression spring 6 is formed in a spiral shape with the Z direction as an axial direction, and is disposed between the lid 22 of the case 2 and the spring holder portion 51 of the valve element 5. The compression spring 6 is disposed so as to be compressed from a natural state so as to apply a predetermined valve closing force (urging force) to the valve body 5. That is, in a state where the compression spring 6 is compressed by the lid 22 by a predetermined amount, the lid 22 and the case main body 21 are fixed by welding, adhesion, or the like. At this time, the cover 22 may be screwed to the case body 21, and the compression spring 6 may be compressed by screwing the cover 22 to the case body 21.

As shown in fig. 3, the drive element 7 includes a first housing portion 71 and a second housing portion 72 made of metal, a diaphragm 73, an adsorbing material 74, and a transmission member 75. The second housing portion 72 is an upper housing, has a plate portion 721 formed with an opening, a cylindrical portion 722 extending downward from the outer peripheral edge of the plate portion 721, and a flange portion 723 extending outward from the lower end of the cylindrical portion 722, and is formed in a bottomed cylindrical shape. The second casing portion 72 is fixed air-tightly to the lower end portion of the case main body 21 by caulking or brazing.

The first case portion 71 is a lower case, has a bottom portion 711, a cylindrical portion 712 extending upward from the outer periphery of the bottom portion 711, and a flange portion 713 extending outward from the upper end of the cylindrical portion 712, and is formed in a bottomed cylindrical shape (box shape) having an open upper side. The tubular portion 712 is provided with a tubular introduction portion 714 for introducing the enclosed gas into an enclosed space A4 described below, and the introduction portion 714 is sealed after the enclosed gas is introduced. The lower surface of the bottom portion 711 is in contact with the cooler 103, and thus the heat of the cooling targets 201 to 204 is transferred to the enclosure space A4 (and the adsorbent 74) via the cooler 103. That is, the first casing section 71 has a bottom 711 as a heat receiving section and receives heat from the cooling targets 201 to 204.

The diaphragm 73 is made of metal and can apply a valve opening force to the valve body 5, and is held with its outer peripheral edge sandwiched between the

flanges

713 and 723, and the diaphragm 73 and the

flanges

713 and 723 are fixed in an airtight manner by welding or brazing. As described above, the second casing section 72 is fixed hermetically to the case main body 21, and thus the third space A3 surrounded by the lower surface of the case main body 21, the second casing section 72, and the diaphragm 73 is formed. The third space A3 communicates with the second space A2 in the casing 2 through the communication hole 219, and serves as a space into which the refrigerant is introduced.

The opening on the upper side of the first case portion 71 is covered with the diaphragm 73, thereby forming an enclosed space A4. The diaphragm 73 divides a third space A3 formed by the second casing section 72 and an enclosed space A4 formed by the first casing section 71. The enclosed space A4 is filled with, for example, carbon dioxide as an enclosed gas. The enclosed gas exists in a gaseous state in a temperature range in which it is used, and the kind of the enclosed gas may be appropriately selected in consideration of stability, environmental load, and the like.

The adsorbent 74 is, for example, a porous body such as activated carbon, and the material, surface area, size of pores, and the like of the adsorbent 74 may be selected according to the type of the enclosed gas, and the pressure-temperature characteristics described below may be selected to have desired characteristics. The adsorbent 74 is housed in the package 76 and is provided inside the enclosure space A4. The package 76 is formed of a material (for example, nonwoven fabric) through which the adsorbent 74 cannot pass and the enclosed gas can pass. This can prevent the adsorbent 74 from overflowing when the drive element 7 is assembled, and can bring the enclosed gas into contact with the adsorbent 74.

A convex portion 711A that is convex toward the sealed space A4 side (concave when viewed from the bottom surface side) is formed in the center portion of the bottom portion 711 of the first housing portion 71. The package 76 is disposed so as to be separated from the upper surface of the projection 711A while being in contact with the bottom 711 so as to avoid the projection 711A. The package 76 is in contact with the upper surface of the bottom 711 and thus conducts heat efficiently. In addition, the convex portion 711A may become a welded portion, and at this time, the welded portion is separated from the package 76, thereby suppressing the package 76 from being heated during welding. The configuration of the adsorbent 74 and its surroundings is not limited to the above configuration, and for example, the convex portion 711A may not be formed in the bottom portion 711, or a block-shaped adsorbent may be provided without housing the adsorbent 74 in the package 76.

The adsorbent 74 has a characteristic of being capable of adsorbing the enclosed gas and the amount of adsorption decreases as the temperature increases. The pressure of the enclosed space A4 in which the enclosed gas is enclosed and the adsorbent 74 is provided increases as the temperature increases.

The transmission member 75 is disposed in the third space A3, which is a space into which the refrigerant is introduced, and includes a plate main body 751 extending along the diaphragm 73 and a tubular guided portion 752 projecting upward from the plate main body 751. A region of the plate body 751 on the inner side of the guided portion 752 is a plate portion 751A. The entire lower surface of the plate main body 751 including the plate portion 751A is in contact with the diaphragm 73 and receives force, and the upper surface of the plate portion 751A is in contact with the tip (lower end surface) of the extension portion 53 of the valve element 5 and transmits force. That is, when the pressure in the sealed space A4 increases and the diaphragm 73 attempts to displace to protrude upward, a force is transmitted to the valve body 5 via the plate body 751, and this force becomes a valve opening force. Thus, the lower surface side of the plate body 751 is integrally formed as a contact portion 754 to be in contact with the diaphragm 73. The extension 53 of the valve body 5 may be fixed to the upper surface of the plate main body 751.

The inner diameter of the guided portion 752 is slightly larger than the outer diameter of the cylindrical portion 218, and the guided portion 752 is guided by the outer circumferential surface of the cylindrical portion 218, whereby the transmission member 75 moves in the Z direction. When the transmission member 75 moves in the Z direction and the valve opening degree reaches a predetermined value, the distal end (distal end surface) 218A of the cylinder portion 218 abuts on the upper surface of the plate portion 751A to restrict the movement of the transmission member 75 and the valve element 5, and the valve opening degree is maximized at this time.

When the transmission member 75 moves, the force acts as described below. First, when the diaphragm 73 is displaced so as to protrude upward and the valve opening is increased, the plate portion 751A is urged toward the lower surface side (the other surface side) by the diaphragm 73 and the extension portion 53 is abutted against the upper surface side (the one surface side) to be urged. That is, when force is transmitted from the transmission member 75 to the valve body 5, the force acts on substantially the same portion of the plate portion 751A from both sides. On the other hand, when the valve opening degree is maximum and the movement of the transmission member 75 is restricted, the plate portion 751A is urged by the diaphragm 73 on the lower surface side (the other surface side) and is urged by the cylinder portion 218 on the upper surface side (the one surface side). That is, when the movement of the transmission member 75 is restricted, the forces act on substantially the same portion of the plate portion 751A from both sides.

In the present embodiment, the entire transmission member 75 including the contact portion 754 is made of metal, and the kind of the metal is the same as that of the metal constituting the diaphragm 73. Examples of the metal constituting the diaphragm 73 and the transmission member 75 include stainless steel (SUS 304, SUS316, and the like). Thus, even when a conductive refrigerant is present between the diaphragm 73 and the transmission member 75, the metals constituting the respective members have equal ionization tendencies, and therefore, the potential difference between the metals can be suppressed.

In the flow rate control valve 1 described above, when the temperatures of the objects to be cooled 201 to 204 rise, the temperature of the sealed space A4 also rises, and the pressure of the sealed space A4 rises. The diaphragm 73 is displaced so as to project upward by the pressure difference between the third space A3 and the sealed space A4, whereby the transmission member 75 is moved, the valve body 5 is also moved upward, and the valve opening degree is increased. Thereby, the flow rate of the refrigerant passing through the valve port 216 increases. That is, the amount of refrigerant passing through is also increased in accordance with the temperature increase of the cooling targets 201 to 204.

In the cooling device 100, the flow rate adjustment valve 1 is provided on the downstream side of the cooler 103 in the direction in which the refrigerant flows, that is, the radiator 102, the cooler 103, and the flow rate adjustment valve 1 are arranged in this order in the direction in which the refrigerant flows. As described above, in the flow rate adjustment valve 1, the valve opening degree changes according to the temperatures of the cooling objects 201 to 204, and the flow rate of the refrigerant passing therethrough is adjusted, so that the flow rate of the refrigerant passing through each cooler 103 changes independently.

The refrigerant cooled in the radiator 102 passes through the cooler 103 to exchange heat with the objects 201 to 204 to be cooled, and the temperature thereof rises. The refrigerant having thus increased in temperature passes through the flow rate adjustment valve 1, and the refrigerant having increased in temperature is introduced into the third space A3.

According to the present embodiment described above, since the entire transmission member 75 in contact with the diaphragm 73 in the third space A3 into which the refrigerant is introduced is made of the same metal as the diaphragm 73, even when the conductive fluid is used as the refrigerant, the occurrence of a potential difference due to contact between different kinds of metals can be suppressed, and corrosion of the transmission member 75 and the diaphragm 73 can be suppressed.

In contrast, when corrosion occurs on the lower surface side of the transmission member 75, the dimension (thickness) of the transmission member 75 in the Z direction becomes smaller, and therefore, when the diaphragm 73 is deformed by a predetermined amount, the distance over which the valve element 5 is moved is smaller than it would otherwise be, and the valve opening changes in response to the pressure change in the enclosed space A4. Since corrosion of the transmission member 75 is suppressed, the valve opening degree is less likely to change with respect to the characteristics of the pressure change in the enclosed space A4, and the flow rate characteristics of the flow rate adjustment valve can be easily maintained. Further, since corrosion of the diaphragm 73 is suppressed, a change in characteristics (elasticity and the like) related to deformation of the diaphragm 73 can be reduced, and the deformation characteristics of the diaphragm 73 with respect to a pressure change in the enclosed space A4 can be easily maintained. That is, the valve opening degree is less likely to change with respect to the characteristics of the pressure change in the enclosed space A4, and the flow rate characteristics of the flow rate adjustment valve 1 can be easily maintained.

Further, the transmission member 75 is entirely made of metal, and can be made of one material, and can be easily manufactured. Further, the load resistance of the transmission member 75 is easily ensured.

Further, the plate portion 751A of the transmission member 75 abuts on the diaphragm 73 on one surface side and abuts on the extension portion 53 and the tube portion 218 on the other surface side, so that the above-described ground force acts on substantially the same portion of the plate portion 751A from both surface sides, and the shear stress can be reduced. This can reduce the thickness of the plate portion 751A, and can suppress an increase in size of the transmission member 75.

The present invention is not limited to the above-described embodiments, and includes other configurations and the like that can achieve the object of the present invention, and modifications and the like described below are also included in the present invention. For example, in the above embodiment, the entire transmission member 75 is made of the same kind of metal as the kind of the diaphragm 73, but the entire transmission member may be made of resin. With such a configuration, corrosion can be suppressed as in the above embodiment, and cost reduction can be achieved. Further, even when the entire transmission member is made of resin and the load resistance is reduced, the thickness can be reduced by reducing the shear stress to the plate portion as described above, and the transmission member can be prevented from being increased in size.

The transmission member is not limited to being formed of one material as a whole, and may be formed of a plurality of materials. For example, as in a modification shown in fig. 4, the base portion 75A of the transmission member 75 may be made of metal, and the lower surface (surface of the contact portion 754) 751B of the plate body 751 may be made of resin. That is, the base portion 75A may be made of, for example, brass, and a resin coating may be applied to the lower surface 751B. In the example shown in fig. 4, the inner circumferential surface 752A of the cylindrical guided portion 752 is also made of resin. The inner peripheral surface 752A functions as a sliding contact surface with respect to the cylindrical portion 218, and is coated with a resin to reduce sliding resistance. Further, the resin coating is also applied to the upper surface 751C of the plate portion 751A, and even when the extension portion 53 is made of a metal different from the transmission member 75, corrosion can be suppressed.

According to the modification shown in fig. 4, corrosion can be suppressed as in the above embodiment, and the degree of freedom in selecting the material of the base portion 75A can be improved. For example, the diaphragm 73 may be required to be easily deformed, and the transmission member 75 may be required to have high rigidity. Further, since the base portion 75A is made of metal, load resistance can be easily secured.

In the modification shown in fig. 4, the lower surface 751B of the plate body 751 may be made of a metal of the same kind as that of the diaphragm 73.

In the above embodiment, the force acts on the plate portion 751A from both sides in the transmission member 75 at substantially the same position, but the position where the force acts on the transmission member from the diaphragm side and the position where the force acts on the transmission member from the opposite side may be offset. For example, the regulating portion may be configured to abut against the vicinity of the outer peripheral edge of the transmission member when regulating the movement of the transmission member toward the valve opening side.

While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to the embodiments described above, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention.

Claims

1. A flow rate adjustment valve that adjusts the flow rate of a refrigerant passing therethrough in accordance with the temperature of a cooling target, the flow rate adjustment valve being characterized by comprising:

a primary port for introducing the refrigerant;

a valve body having a valve port through which the refrigerant flowing from the primary port passes;

a valve element movably provided in the valve body and changing an opening degree of the valve port;

a secondary port for sending out the refrigerant passing through the valve port;

valve closing force applying means for applying a predetermined valve closing force to the valve body; and

a drive element for driving the valve element,

the drive element includes: a first housing portion that forms an enclosed space enclosing an enclosed gas and receives heat from the cooling target; a second casing section forming a space for introducing the refrigerant; a metal diaphragm provided between the first casing section and the second casing section to define a space; and a transmission member that is in contact with the diaphragm in a space into which the refrigerant is introduced and is capable of transmitting a valve opening force to the valve body,

2. The flow regulating valve according to claim 1,

the transmission member is entirely made of metal or resin of the same kind as that of the diaphragm.

3. The flow regulating valve according to claim 1,

the base of the transmission member is made of metal, and the surface of the contact portion is made of metal or resin of the same kind as that of the diaphragm.

4. A flow regulating valve according to any one of claims 1 to 3,

the valve body has a cylindrical portion through which the extension portion can pass, and the distal end of the cylindrical portion abuts against the other surface side of the plate portion to restrict the transmission member from moving toward the valve opening side.

5. A cooling device is characterized in that a cooling device is provided,

the flow rate adjustment valve according to any one of claims 1 to 4, a transport fluid unit that sends out the refrigerant in a predetermined direction, a heat radiation unit that radiates heat from the refrigerant, and a heat receiving unit that allows the refrigerant to pass therethrough and receives heat from the object to be cooled, wherein the refrigerant is circulated through a flow path that connects the flow rate adjustment valve, the transport fluid unit, and the heat radiation unit.