阅读说明：本技术 温度感应型控制阀 (Temperature sensing type control valve ) 是由 高田裕正 横田纯一 于 2019-07-03 设计创作，主要内容包括：本发明提供一种温度感应型控制阀,在对需要冷却的热源进行冷却的冷却装置的制冷剂供给用的配管上设置的温度感应型控制阀(100),其减少周围的环境温度的影响。热电偶(20)的活塞(23)设为能相对于导向部(22a)的端部突出或没入。具备利用阀芯(3)开闭供制冷剂流经的阀口(13)的阀装置主体(10)。包含阀芯(3)的构造部由膜片(43)封闭密封。由上壳体(42)的圆筒部(42a)收纳热电偶(20)的导向壳体(22)、活塞(23)及感温部侧基部(21b)。热电偶(20)的感温部(21a)从圆筒部(42a)露出。感温部(21a)由导热率高的铜材制成,上壳体42(圆筒部(42a))由导热率低的不锈钢制成。(The invention provides a temperature-sensitive control valve (100) which is arranged on a pipe for supplying refrigerant of a cooling device for cooling a heat source needing cooling and reduces the influence of the ambient temperature. A piston (23) of the thermocouple (20) is provided so as to be capable of protruding or sinking into the end of the guide section (22 a). A valve device body (10) is provided with a valve port (13) through which a refrigerant flows, which is opened and closed by a valve element (3). The structural part containing the valve core (3) is sealed by a membrane (43). A guide case (22), a piston (23), and a temperature sensing part side base part (21b) of a thermocouple (20) are housed in a cylindrical part (42a) of an upper case (42). A temperature sensing part (21a) of the thermocouple (20) is exposed from the cylindrical part (42 a). The temperature sensing part (21a) is made of a copper material having high thermal conductivity, and the upper case (42) (cylindrical part (42a)) is made of stainless steel having low thermal conductivity.)

1. A temperature-sensitive control valve is provided with:

a thermocouple having a temperature sensing unit filled with a thermal expansion body that expands and contracts in response to a temperature change, and an operating shaft that moves in an axial direction in response to a volume change of the thermal expansion body; and

a valve device body that moves a valve element by the pressing force in the axial direction transmitted from the working shaft and opens and closes a valve port through which a refrigerant flows by the valve element,

the temperature-sensitive control valve described above is characterized in that,

the temperature sensing unit of the thermocouple is exposed and a cover case covering a part of the thermocouple including the operating shaft is provided, the temperature sensing unit is formed of a member having high thermal conductivity, and the cover case is formed of a member having lower thermal conductivity than the temperature sensing unit.

2. The temperature-sensitive control valve according to claim 1,

an operation portion that seals a structural portion including the valve body with a seal member and transmits a mechanical pressing force in the axial direction to the valve body via the seal member is formed in the valve device body,

the sealing member is formed of a member having a lower thermal conductivity than the temperature sensing unit.

3. The temperature-sensitive control valve according to claim 2,

the operating portion includes a working shaft side stopper disposed on the working shaft side of the sealing member, and the working shaft side stopper is formed of a member having a lower thermal conductivity than the temperature sensing portion.

4. The temperature-responsive control valve according to any one of claims 1 to 3,

the temperature sensing part is made of a copper material, and the member having a lower thermal conductivity than the temperature sensing part is made of any one of stainless steel, iron, aluminum, brass, and resin.

5. The temperature-responsive control valve according to any one of claims 1 to 3,

the temperature sensing part is made of aluminum, and the member having a lower thermal conductivity than the temperature sensing part is made of any one of stainless steel, iron, brass, or resin.

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 patent application laid-open No. 2017-67164 (patent document 2) discloses a thermocouple and a piston assembly suitable for sensing the temperature of a heat source.

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 heat source reaches the set temperature, the valve port is immediately opened to a large extent, and the amount of refrigerant required for cooling immediately flows in, thereby rapidly cooling the heat source. 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. However, in this case, it is necessary to consider the influence of external disturbances such as the ambient air temperature of the thermocouple and the temperature of the refrigerant.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a temperature-sensitive control valve which is provided in a pipe for supplying a refrigerant of a cooling device that cools a heat source to be cooled, and which can supply the refrigerant by sensing a temperature change of the heat source by a thermocouple, wherein the temperature-sensitive control valve can accurately acquire a temperature change of a temperature sensing target to open the valve at a set temperature by reducing the influence of an ambient temperature and the temperature of the refrigerant, and can quickly follow the temperature change of the temperature sensing target.

Means for solving the problems

The temperature-sensitive control valve according to claim 1 includes: a thermocouple having a temperature sensing unit filled with a thermal expansion body that expands and contracts in response to a temperature change, and an operating shaft that moves in an axial direction in response to a volume change of the thermal expansion body; and a valve device main body that moves a valve element by the pressing force in the axial direction transmitted from the operating shaft and opens and closes a valve port through which a refrigerant flows by the valve element, wherein the temperature-sensitive control valve includes a cover case that exposes the temperature-sensitive portion of the thermocouple and covers a part of the thermocouple including the operating shaft, the temperature-sensitive portion is formed of a member having a high thermal conductivity, and the cover case is formed of a member having a lower thermal conductivity than the temperature-sensitive portion.

The temperature-sensitive control valve of claim 2 is characterized in that an operation portion that seals a structural portion including the valve element with a seal member and transmits a mechanical pressing force in the axial direction to the valve element via the seal member is formed in the valve device body, and the seal member is formed of a member having a lower thermal conductivity than the temperature-sensitive portion, according to claim 1.

The temperature-responsive control valve according to claim 3 is the temperature-responsive control valve according to claim 2, wherein the operating portion includes a working shaft side stopper disposed on the working shaft side of the seal member, and the working shaft side stopper is formed of a member having a lower thermal conductivity than the temperature-sensitive portion.

The temperature-responsive control valve according to claim 4 is characterized in that the temperature-responsive control valve according to any one of claims 1 to 3, wherein the temperature-responsive part is made of a copper material, and the member having a lower thermal conductivity than the temperature-responsive part is made of any one of stainless steel, iron, aluminum, brass, and resin. The "copper material" is, for example, copper containing 99% by weight or more of copper.

The temperature-responsive control valve according to claim 5 is characterized in that the temperature-responsive control valve according to any one of claims 1 to 3, wherein the temperature-sensitive portion is made of aluminum, and the member having a lower thermal conductivity than the temperature-sensitive portion is made of any one of stainless steel, iron, brass, or resin.

The effects of the invention are as follows.

According to the temperature-sensitive control valve of claims 1 to 5, the influence of the ambient temperature on the thermocouple can be reduced by the cover case having a lower thermal conductivity than the thermal conductivity of the temperature-sensitive portion, and the temperature-sensitive portion having a higher thermal conductivity of the thermocouple can quickly follow the temperature change of the temperature sensing object.

According to the temperature-sensitive control valve of claim 2, the influence of the temperature of the refrigerant on the thermocouple on the valve device main body side can be reduced by the sealing member having low heat conductivity.

According to the temperature-sensitive control valve of claim 3, the influence of the temperature of the refrigerant on the thermocouple on the valve device main body side can be reduced by the working shaft side stopper having low thermal conductivity.

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.

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 (operating shaft), 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 stem, 3B-a needle part, 3 c-a flange part, 31-a spring seat, 32-a coil spring, 4-an operating part, 41-a lower cover, 42-an upper housing, 42A-a cylindrical part, 42A 1-a diaphragm (seal member), 44-a lower stopper (spool side stopper), 45-an upper stopper (operating shaft side stopper), 46-a fixed spring, 47-a coil spring, 45a clearance hole, 45 b-guide insertion hole, 45 c-spring accommodation hole, 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.