CN220669832U - Temperature valve device, cooling device, and refrigeration cycle system - Google Patents

Abstract

The utility model provides a temperature valve device, a cooling device and a refrigeration cycle system, wherein a feed gas with small environmental load is used in the temperature valve device with a driving actuator for displacing a valve core according to the pressure difference between a closed chamber and a pressure equalizing chamber, and the feed gas can be detected by a leak detector, so that the height detection can be easily performed. A temperature valve device (10) is used which has a drive actuator (2) for displacing a valve element (3) according to the pressure difference between a closed chamber (23) and a pressure equalizing chamber (22). The valve opening is controlled by driving an actuator (2). In the closed chamber (23), a feed gas is constituted by a combined gas constituted by one or more gases selected from the group consisting of main component gases existing in the atmosphere and a leak detection gas (helium or the like) detectable by a He leak detector (30).

Description

Temperature valve device, cooling device, and refrigeration cycle system

The present utility model is a divisional application of an utility model patent application with a date of application 2021, a date of application 07, a date of application 2021217722890, and an utility model name of "temperature valve device, cooling device, and refrigeration cycle system".

Technical Field

The present utility model relates to a temperature type valve device and a refrigeration cycle system, each of which has a displacement member that is displaced in accordance with a pressure difference between a closed chamber and a pressure equalizing chamber, and in which a valve opening degree is controlled by the displacement member.

Background

Conventionally, in a temperature valve device (expansion valve) used for a cooling device, carbon dioxide (CO 2) which is a gas existing in the atmosphere is used as a feed gas enclosed in a closed chamber, and nitrogen dioxide and nitrogen (N2) are mixed and enclosed. However, there is no leak detector capable of detecting leakage of carbon dioxide, nitrogen, or the like existing in the atmosphere, and it is difficult to detect leakage when performing airtight inspection. For example, it is necessary to perform the inspection process after the charging for several days, to confirm whether there is no performance change or the like, and to confirm the air tightness, and it takes a very long time.

In contrast, for example, the following method is disclosed in Japanese patent application laid-open No. 2004-132561 (patent document 1): carbon dioxide is replaced with freon gas (R23, etc.) and is sealed, so that the leakage can be detected by a leak detector, and the leakage inspection from the closed chamber can be performed promptly and reliably.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2004-132561

Disclosure of Invention

Problems to be solved by the utility model

In the case of patent document 1, regardless of the manner of charging, even in the case of adsorption charging, if only atmospheric gas is used, leak detection cannot be performed, and thus detectable freon gas is enclosed. However, in recent years, from the viewpoint of environmental protection, there is a problem of global warming in freon gas, and it is desired to enclose a gas which is harmless to the earth and can be rapidly subjected to leak inspection.

The present utility model aims to provide a temperature valve device having a drive actuator for displacing a valve element according to a pressure difference between a closed chamber and a pressure equalizing chamber, wherein the opening degree of the valve is controlled by the drive actuator, and wherein a gas which has a low GWP, is as low as a main component gas (CO 2 or the like) existing in the atmosphere, has a small environmental load, and can be detected by a leak detector is enclosed, so that a high degree of inspection can be easily performed, and the process time is greatly shortened.

Means for solving the problems

The temperature valve device of the present utility model comprises a drive actuator for displacing a valve element according to a pressure difference between a closed chamber and a pressure equalizing chamber, and is characterized in that a main component gas (N ₂ ，O ₂ ，CO ₂ Ar, etc.) and a leak detection gas that can be detected by a leak detector. In the present specification and drawings, numerals indicating the number of atoms in the molecular formula of a substance are not indicated by subscripts, but by numerals having full angles.

In this case, the preferred temperature valve device is characterized in that the above-mentioned combined gas is mixed and sealed by adsorption charging by the adsorption material.

In addition, the preferred temperature valve device is characterized in that the combined gas is composed of one or more selected from nitrogen, oxygen, carbon dioxide and argon.

In addition, a preferable temperature valve device is characterized in that a gas which is difficult to be adsorbed on the adsorbent is used as the leak detection gas.

In addition, the temperature-type valve device is preferably characterized in that the leak detection gas is helium or hydrogen.

In addition, a preferable temperature valve device is characterized in that freon with low GWP is used as the leak detection gas.

The cooling device of the present utility model comprises: a refrigerant delivery unit for delivering and circulating a refrigerant through the system piping; a first heat exchanger for radiating heat from the refrigerant; a flow rate control valve for controlling the flow rate of the refrigerant; and a second heat exchanger for cooling the cooling object, wherein the temperature valve device according to any one of the above aspects is used as the flow control valve.

The refrigeration cycle system of the present utility model includes: a refrigerant delivery unit for delivering and circulating a refrigerant through the system piping; a first heat exchanger for radiating heat from the refrigerant; a flow rate control valve for controlling the flow rate of the refrigerant; and a second heat exchanger for cooling the cooling object, wherein the refrigeration cycle system is characterized in that the temperature valve device according to any one of the above aspects is used as the flow control valve.

Effects of the utility model

According to the temperature valve device, the cooling device, and the refrigeration cycle system of the present utility model, since the combined gas is a gas having a low GWP of the main component gas (CO 2 or the like) existing in the atmosphere in the feed gas for driving the actuator, and the leak detection gas (helium or hydrogen) which is small in environmental load and can be detected by the leak detector is enclosed, it is possible to easily perform high-level inspection, and the process time is greatly shortened.

Drawings

Fig. 1 is a longitudinal sectional view of a temperature type valve device according to an embodiment of the present utility model in the air tightness test.

Fig. 2 is a diagram showing a main part of a cooling device using a temperature-type valve device according to an embodiment of the present utility model.

Fig. 3 is a diagram showing a main part of a refrigeration cycle system using a temperature-type valve device according to an embodiment of the present utility model.

Fig. 4 (a) and 4 (B) are diagrams for explaining a change in volume in a closed chamber of a temperature valve device according to an embodiment of the present utility model, in comparison with a comparative example.

Fig. 5 is a graph showing the temperature-pressure characteristic of a conventional temperature-type valve device as a comparative example.

Fig. 6 is a graph showing temperature-pressure characteristics of the temperature-type valve device according to the embodiment of the present utility model.

In the figure: 1-valve housing, 2-drive actuator, 2A-temperature sensing cylinder, 2B-capillary, 2A-upper cover, 2B-lower cover, 2C-adsorbent, 21-diaphragm, 22-pressure equalizing chamber, 23-closed chamber, 3-valve core, 31-flange portion, 32-needle portion, 33-working shaft, 10-temperature valve device, 10' -temperature valve device, 10a primary side joint, 10B-secondary side joint, 11-first port, 12-second port, 13-valve port, 14-first pressure equalizing path, 15-second pressure equalizing path, 16-pilot hole, 20-chamber, 30-He leak detector.

Detailed Description

Next, embodiments of the temperature-type valve device and the refrigeration cycle system according to the present utility model will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of a temperature-type valve device according to an embodiment in the air tightness test, fig. 2 is a diagram showing a main part of a cooling device using the temperature-type valve device according to an embodiment, and fig. 3 is a diagram showing a main part of a refrigeration cycle system using the temperature-type valve device according to an embodiment, and first, the cooling device and the refrigeration cycle system according to an embodiment will be described. In fig. 2 and 3, the refrigerant flows in the direction of the arrow. The cooling device in fig. 2 is a system for cooling an object by circulating a cooled refrigerant liquid by a pump, unlike a general refrigeration cycle system cooled by vaporization heat, which will be described later, in fig. 3.

In fig. 2, 10 is a temperature valve device according to an embodiment, 100 is a pump serving as a "refrigerant delivery unit", 200 is a radiator serving as a "first heat exchanger", 300 is a cooler (for example, a condensation plate) serving as a "second heat exchanger", and these are connected in a ring shape by a pipe to form a cooling device. As will be described later, the temperature valve device 10 has a diaphragm-type drive actuator 2. The primary side joint 10a of the temperature valve device 10 is connected to an outlet side pipe of the cooler 300, and the secondary side joint 10b of the temperature valve device 10 is connected to an inlet side pipe of the radiator 200. The cooler 300 is disposed in contact with a heat source a (a heat generating component such as a motor or an inverter mounted on an electric vehicle or a hybrid vehicle, a CPU such as a mainframe computer system or a server, or the like) to be cooled.

The radiator 200 radiates heat of the refrigerant (cold water, fluorine-based inert liquid, etc.), and the refrigerant cooled by the radiation is flowed to the cooler 300 by the pump 100. The refrigerant flowing out of the cooler 300 flows into the temperature type valve device 10. The feed gas is sealed in the drive actuator 2 of the temperature valve device 10 by adsorption feeding or the like as will be described later. Then, the flow rate of the refrigerant is controlled based on the temperature of the cooler 300 sensed by the driving actuator 2, and the refrigerant is caused to flow to the radiator 200. Thereby, the heat source a is cooled via the cooler 300.

In fig. 3, 10' is a temperature valve device according to an embodiment described below, 400 is a compressor as a "refrigerant delivery unit", 500 is a condenser as a "first heat exchanger", 600 is an evaporator as a "second heat exchanger", and these are connected in a loop by piping to form a refrigeration cycle. The temperature valve device 10' includes a diaphragm-type drive actuator 2 and a temperature sensing tube 2a connected to the drive actuator 2 through a capillary tube 2b, as will be described later. The primary side joint 10a of the temperature valve device 10 'is connected to an outlet side pipe of the condenser 500, and the secondary side joint of the temperature valve device 10' is connected to an inlet side pipe of the evaporator 600. The evaporator 600 is disposed in an indoor atmosphere for an air conditioner or refrigerator to be cooled, and the temperature sensing tube 2a is attached to an outlet side pipe of the evaporator 600.

The compressor 400 compresses the refrigerant flowing through the refrigeration cycle, and the compressed refrigerant is condensed and liquefied by the condenser 500 and flows into the temperature valve device 10'. The temperature valve device 10' is an expansion valve, and depressurizes (expands) the inflow refrigerant and causes the inflow refrigerant to flow into the evaporator 600. The evaporator 600 evaporates and gasifies the refrigerant, and circulates the gas-phase refrigerant through the compressor 400 via an accumulator or the like, not shown. The evaporator 600 absorbs heat from the heat generating element, air, or the like by evaporating and vaporizing the refrigerant. Thereby the heat generating body, air, or the like is cooled. A feed gas is sealed in the temperature sensing tube 2a by adsorption feeding or the like, and the temperature sensing tube 2a is connected to the drive actuator 2 by a capillary tube 2 b.

Fig. 1 is a longitudinal sectional view of the thermal valve device 10 during airtight inspection. The concept of "up and down" in the following description corresponds to up and down of the drawing of fig. 1, and the axis L indicated by a chain line is the center line of the valve port 13 described later, and corresponds to the moving direction of the valve body 3.

As shown in fig. 1, the temperature valve device 10 includes a metal valve housing 1, and a valve chamber 1R, a first port 11 connected to the primary side joint 10a, and a second port 12 connected to the secondary side joint 10b are formed in the valve housing 1. The first port 11 communicates with the valve chamber 1R, and a valve port 13 is formed between the valve chamber 1R and the second port 12. The valve housing 1 is formed with a first pressure equalizing passage 14 that communicates the valve chamber 1R with the second port 12 and a second pressure equalizing passage 15 that communicates the second port 12 with a pressure equalizing chamber 22 described later. The valve housing 1 is provided with a guide hole 16 that opens from the second port to the pressure equalizing chamber 22 side on the axis L of the valve port 13, and the guide hole 16 is formed in a cylindrical shape centered on the axis L.

The valve housing 1R, the valve port 13, the second port 12, and the guide hole 16 are provided with the valve body 3. The valve body 3 has a flange 31 disposed in the valve chamber 1R, a conical needle 32 disposed in the valve port 13, and an operating shaft 33 fitted to the inner peripheral surface of the guide hole 16 with a clearance. Thus, the valve body 3 is accommodated in the guide hole 16 so as to be movable in the direction of the axis L, and the needle portion 32 adjusts the opening of the valve port 13 by the movement in the direction of the axis L. An adjustment screw 17 made of a metal member is screwed to the upper portion of the valve housing 1, and an adjustment spring 18 is disposed between the adjustment screw 17 and the flange portion 31 of the valve body 3.

The drive actuator 2 formed at the lower portion of the valve housing 1 is an outer case composed of a thin disk-shaped upper cover 2A and a lower cover 2B. A diaphragm 21 is provided between the upper cover 2A and the lower cover 2B, and an upper space of the diaphragm 21 is a pressure equalizing chamber 22, and a lower space of the diaphragm 21 is a closed chamber 23. A pressure plate 24 is disposed in the pressure equalizing chamber 22 so as to abut against the diaphragm 21, and an operating shaft 33 of the valve body 3 is connected to the pressure plate 24. An adsorbent 2C (e.g., activated carbon) is disposed in the closed chamber 23. The closed chamber 23 in which the adsorbent 2C is disposed is filled with a feed gas. The feed gas is filled into the closed chamber 23 through the introduction pipe 2B1 provided in the lower cover 2B, and after this filling, the end of the introduction pipe 2B1 is closed.

With the above configuration, the refrigerant introduced into the primary side joint 10a flows into the valve chamber 1R from the first port 11, and is introduced into the pressure equalizing chamber 22 from the valve chamber 1R via the first pressure equalizing passage 14, the second port 12, and the second pressure equalizing passage 15. In addition, the refrigerant of the second port 12 flows out from the secondary side joint 10 b. Thus, even in the state where the valve port 13 is fully closed, a predetermined refrigerant flow rate can be obtained.

On the other hand, when the pressure of the charging gas in the closed chamber 23 increases or decreases according to the sensed temperature of the drive actuator 2 (lower cover 2B), the diaphragm 21 deforms. Then, as the diaphragm 21 deforms, the working shaft 33 (and the pressure plate 24) of the valve body 3 moves in the direction of the axis L, and the gap between the valve port 13 and the needle portion 32 of the valve body 3, that is, the valve opening degree changes. According to the valve opening, the flow rate of the refrigerant flowing from the primary side joint 10a to the secondary side joint 10b is controlled. Further, by adjusting the amount of screw-in of the adjusting screw 17, the force with which the diaphragm 21 is pressed by the operating shaft 33 and the pressing plate 24 of the valve body 3 can be adjusted, and the pressure at which the valve port 13 starts to open according to the pressure of the charging gas in the closed chamber 23 can be adjusted.

The above structure and operation are the case of the temperature-type valve device 10 functioning as a flow control valve in the cooling device, and the temperature-type valve device 10' functioning as an expansion valve in the refrigeration cycle system is a device in which a part of the temperature-type valve device 10 is modified. That is, although not shown, the first pressure equalizing passage 14 and the second pressure equalizing passage 15 are omitted, and the pressure equalizing passage that communicates from the valve chamber 1R to the pressure equalizing chamber 22 of the drive actuator 2 is provided so as to bypass the second port 12. The flow direction was set to be a reverse flow. Thus, the refrigerant flowing into the second port 12 from the secondary side joint 10b flows out to the first port 11 from the gap between the valve port 13 and the needle portion 32 of the valve body 3. That is, the refrigerant is depressurized (expanded) and then discharged, thereby obtaining the function of the expansion valve. The temperature valve device 10' is connected to the capillary tube 2B and the temperature sensing tube 2a via the introduction tube 2B 1. The expansion valve is not limited to the above-described structure, and may be a structure of a conventional temperature type expansion valve other than the feed gas.

As shown in fig. 1, the temperature-type valve device 10 is housed within a chamber 20, and the chamber 20 communicates with a He leak detector 30. The combined gas and the leak detection gas are mixed and sealed in the sealed chamber 23 of the drive actuator 2 of the temperature valve device 10. When leakage of helium (He) as a detection gas occurs, the leakage is immediately detected by the He leak detector 30. In this way, helium (He) is a rare gas that exists in the atmosphere in a minute amount, and when leakage occurs from the drive actuator 2, the helium can be easily detected by the He leak detector 30.

The charge gas enclosed in the closed chamber 23 of the drive actuator 2 in this embodiment is as follows. The combined gas is carbon dioxide (CO 2) as a main component gas present in the atmosphere, and the leak detection gas is helium (He) that can be detected by a leak detector. The combined gas may be a gas composed of a main component gas (e.g., N ₂ 、O ₂ ，CO ₂ Ar) is selected from one or more gases. In addition, the leak detection gas may be hydrogen (H) ₂ ). The feeding method is adsorption feeding in which the adsorbent 2C is placed.

As shown in FIG. 4 (A), the feed gas is CO only ₂ In the case of (2), the adsorption amount increases when cooling and the pressure decreases due to the adsorption/desorption characteristics of the activated carbon as the adsorbent, and when heating, the adsorption amount decreases and the desorption is performed, so the pressure increases. This results in the temperature-pressure characteristic shown by the solid line in fig. 5. In addition, CO was used as a feed gas ₂ And N ₂ In the case of a mixed gas of (2), N ₂ Also, the adsorption and desorption properties of activated carbon are affected, and thus the temperature-pressure characteristics indicated by the dotted line in fig. 5 are obtained.

In contrast, the feed gas of the embodiment mixes CO ₂ This combined gas and He (or H) ₂ ) This probe gasA body. However, as shown in FIG. 4 (B), helium (He) is not adsorbed to activated carbon, only CO ₂ The adsorption and desorption characteristics of the activated carbon are affected. That is, when cooled, the adsorption amount increases, the pressure decreases, and when heated, the adsorption amount decreases, based on the activated carbon relative to CO ₂ The adsorption and desorption characteristics of the (combined gas). Therefore, in the embodiment, the temperature-pressure characteristic shown in fig. 6 is the same as the temperature-pressure characteristic shown in fig. 5 by the solid line. That is, in the embodiment, he (or H ₂ ) Since this probe gas does not affect the temperature-pressure characteristic, the same temperature-pressure characteristic as in the prior art can be obtained.

In the above embodiment, the leak detection gas is exemplified by He or H2 mixed with a gas that can be detected by the leak detector, but the leak detection gas is not limited to this gas, and freon with low GWP may be used. A general conventional freon refrigerant has a global warming potential GWP of 2000 or higher (for example, gwp=14800 of R23) and is a gas that promotes warming, but in recent years, it has been used in the refrigeration and air-conditioning industry, for example, in CO ₂ Along with the same natural refrigerant (gwp=1) and the like, even with freon, development of a refrigerant having a low GWP is being advanced, and freon having a lower GWP than the conventional one is used. For example, R32 (gwp=675), R1234yf (gwp=1 or less), and the like can be cited. The use of these low GWP freons for charging is less environmentally friendly, and the freons are a detection gas that can be detected by a leak detector, which in turn can facilitate high-level inspection and greatly shorten the process time. Here, low GWP means 1500 or less, and if 1500 or less, particularly, the environmental load is small, and it can be said that the material is harmless to the earth. (the target value of the environmental impact according to the refrigerating and air-conditioning apparatus is GWP=1500 or less)

In addition, in the above embodiments, the amounts of the various leak detection gases that can be detected by the leak detector are sealed in at most 50% by volume with respect to the amount of the combined gas, so that leak detection can be performed, and appropriate temperature-pressure characteristics can be obtained. In addition, it is preferable that the amount of the leak detection gas is sealed in 5 to 20% by volume with respect to the combined gas, so that detection is possible and more suitable temperature-pressure characteristics can be obtained.

While the embodiments of the present utility model have been described in detail with reference to the drawings and other embodiments have been described in detail, specific configurations are not limited to these embodiments, and the present utility model is also included as long as the modifications and the like of the design do not depart from the gist of the present utility model.

Claims (3)

1. A temperature type valve device having a drive actuator for displacing a valve element according to a pressure difference between a closed chamber and a pressure equalizing chamber, wherein the opening degree of the valve is controlled by the drive actuator,

it is characterized in that the method comprises the steps of,

the drive actuator includes an outer case made of a thin disk-shaped upper cover and a lower cover, a diaphragm is provided between the upper cover and the lower cover, an upper space of the diaphragm is the pressure equalizing chamber, a lower space of the diaphragm is the closed chamber, a platen is disposed in the pressure equalizing chamber so as to be in contact with the diaphragm, a working shaft to which a valve element is connected is disposed in the platen, an adsorbent is disposed in the closed chamber, and a charging gas is filled in the closed chamber in which the adsorbent is disposed,

the above-mentioned gas mixture is formed by mixing and sealing one of the main component gases existing in the atmosphere and the leak detection gas which can be detected by the leak detector in the above-mentioned closed chamber.

2. A cooling device, comprising: a refrigerant delivery unit for delivering and circulating a refrigerant through the system piping; a first heat exchanger for radiating heat from the refrigerant; a flow rate control valve for controlling the flow rate of the refrigerant; and a second heat exchanger for cooling the cooling object,

it is characterized in that the method comprises the steps of,

a temperature type valve device according to claim 1 is used as the flow control valve.

3. A refrigeration cycle system, comprising: a refrigerant delivery unit for delivering and circulating a refrigerant through the system piping; a first heat exchanger for radiating heat from the refrigerant; a flow rate control valve for controlling the flow rate of the refrigerant; and a second heat exchanger for cooling the cooling object,

it is characterized in that the method comprises the steps of,

a temperature type valve device according to claim 1 is used as the flow control valve.