JP2001280721A - High pressure control valve for supercritical steam compression refrigerating cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure control valve to work a supercritical steam compression refrigerating cycle device at a maximum COP. SOLUTION: The high pressure control valve comprises a bellows device 18 to define a refrigerant-sealed closed chamber 18A and be influenced by the temperature of a refrigerant on the outlet side of a radiator, and expanded and contracted by a pressure by density of the sealed refrigerant corresponding to heat transferred to the sealed refrigerant; upper bimetal 29 and lower bimetal 31 influenced by the temperature of the refrigerant on the outlet side of the radiator and changing density of the sealed refrigerant by changing the length of the initial bellows of a bellows device 18; and a valve element 17 connected to the bellows device 18 and driven for opening and closing through expansion and contraction of the bellows device 18 and controlling the degree of communication of a refrigerant passage, running between the radiator and an evaporator, in coordination with a valve port 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure control valve used in a supercritical vapor compression refrigeration cycle apparatus operated in a supercritical region using a refrigerant such as carbon dioxide.

[0002]

2. Description of the Related Art In a supercritical vapor compression refrigeration cycle apparatus using a refrigerant such as carbon dioxide (CO ₂ ) in a supercritical region, the pressure and temperature of the refrigerant at the outlet side of a radiator (gas cooler) are optimally controlled. Japanese Patent Application Laid-Open No. 9-264
No. 622, a high-pressure control valve (pressure control valve) that operates according to a change in the internal pressure (a change in the volume of the enclosed refrigerant) of a diaphragm chamber or a closed chamber in a bellows in which the refrigerant is enclosed due to the temperature of the refrigerant at the radiator outlet side. ) Is provided in the middle of the refrigerant passage from the radiator to the evaporator, and the high-pressure control valve controls the degree of communication of the refrigerant passage between the radiator and the evaporator to control the pressure of the refrigerant on the outlet side of the radiator. It has been known.

In the supercritical vapor compression refrigeration cycle apparatus, when the above-described high pressure control valve is provided, the refrigerant pressure at the outlet of the radiator is controlled in accordance with the refrigerant temperature at the outlet of the radiator, and the refrigeration cycle is controlled. Has a large coefficient of performance (COP).

[0004]

In the conventional high-pressure control valve, the operating characteristics of the bellows device with respect to the temperature are constant. In contrast, in recent experiments and studies, in order to obtain the maximum COP, the operating characteristics of the bellows device with respect to the temperature are not constant, and the operating characteristics of the bellows device depend on the temperature (the refrigerant temperature at the outlet side of the radiator). It has been found that it is preferable to change.

For example, (20 ° C., 6.5 MPa)
At (40 ° C., 11.5 MPa), the refrigeration cycle operated by the high pressure control valve has the largest COP. According to the vapor pressure diagram shown in FIG. 8, carbon dioxide at (20 ° C., 6.5 MPa) Has a density of 800 kg / m ³ , (40 ° C., 11.
The density of carbon dioxide at 5 MPa) is 700 kg / m ³ , and it is required that the density of the refrigerant charged in the bellows device changes with temperature.

Further, the fact that the valve opening pressure of the high-pressure control valve changes in accordance with the refrigerant temperature at the outlet side of the radiator is also effective for increasing the COP.

The present invention has been made in view of the above circumstances, and has as its object to provide a high-pressure control valve for operating a supercritical vapor compression refrigeration cycle apparatus at a maximum COP.

[0008]

In order to achieve the above object, a high pressure control valve for a supercritical vapor compression refrigeration cycle apparatus according to the present invention comprises a compressor, a radiator, an evaporator, a carbon dioxide gas or the like. The refrigerant is sequentially circulated, provided in the middle of the refrigerant passage from the radiator to the evaporator of the supercritical vapor compression refrigeration cycle device operated in the supercritical region, the temperature of the refrigerant on the outlet side of the radiator A high-pressure control valve for controlling the degree of communication of a refrigerant passage between the radiator and the evaporator in response to perform pressure control on a radiator outlet side, wherein the high-pressure control valve defines a closed chamber for charging the refrigerant, and A bellows device that is affected by the temperature of the refrigerant on the outlet side of the radiator and expands and contracts by the pressure due to the density of the sealed refrigerant in accordance with the heat transmitted to the sealed refrigerant; The initial bellows of the bellows device And a density-correcting temperature-sensing member that changes the density of the sealed refrigerant by changing the bellows device, and is opened and closed by expansion and contraction of the bellows device, and cooperates with a valve port to cooperate with the radiator and the evaporator. And a valve for controlling the degree of communication of the refrigerant passage between the valve body and the valve body.

The high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the second aspect of the present invention is the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the first aspect, wherein the bellows device comprises: One end is connected to the fixed side member to be a fixed end, the other end is a free end, holds the valve body at the free end, and is made of a temperature-sensitive material between the fixed side member and the fixed end. A density correction temperature-sensitive member is provided, and a connection position of the fixed end to the fixed side member is changed by the density correction temperature-sensitive member.

A high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the invention of claim 3 is the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to claim 1, wherein the bellows device has one end. Is connected to a fixed side member to be a fixed end, the other end is a free end, a valve holding member is connected to an intermediate portion, the valve body is attached to the valve holding member, the free end and the valve holding A density-corrected temperature-sensitive member made of a temperature-sensitive material is provided between the first and second members, and the position of the free end is changed by the density-corrected temperature-sensitive member.

A high pressure control valve for a supercritical vapor compression refrigeration cycle apparatus according to the invention of claim 4 is the high pressure control valve for a supercritical vapor compression refrigeration cycle apparatus according to any one of claims 1 to 3, The density correction thermosensitive member reduces the density of the sealed refrigerant by extending the initial bellows length of the bellows device according to a temperature rise.

A high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention is operated in a supercritical region by circulating a refrigerant such as carbon dioxide gas through a compressor, a radiator, and an evaporator in order. A supercritical vapor compression refrigeration cycle device is provided in the middle of a refrigerant passage from the radiator to the evaporator in the supercritical vapor compression refrigeration cycle device, and is provided between the radiator and the evaporator in response to the temperature of the refrigerant on the outlet side of the radiator. A high-pressure control valve for controlling the degree of communication of the refrigerant passage of the radiator to control the pressure on the outlet side of the radiator, which defines a closed chamber for charging the refrigerant, is affected by the temperature of the refrigerant on the outlet side of the radiator, and is sealed. A bellows device that expands and contracts by pressure due to the density of the charged refrigerant in accordance with the heat transmitted to the refrigerant; Refrigerant between the vessel A valve body for controlling communication of the road, is composed of a temperature sensitive material, those having a temperature sensitive compensating spring for urging the valve body in the valve opening direction.

Further, the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention is operated in a supercritical region by circulating a refrigerant such as carbon dioxide gas through a compressor, a radiator and an evaporator in order. A supercritical vapor compression refrigeration cycle device is provided in the middle of a refrigerant passage from the radiator to the evaporator in the supercritical vapor compression refrigeration cycle device, and is provided between the radiator and the evaporator in response to the temperature of the refrigerant on the outlet side of the radiator. A high-pressure control valve for controlling the degree of communication of the refrigerant passage of the radiator to control the pressure on the outlet side of the radiator, which defines a closed chamber for charging the refrigerant, is affected by the temperature of the refrigerant on the outlet side of the radiator, and is sealed. A bellows device that expands and contracts by pressure due to the density of the charged refrigerant in accordance with the heat transmitted to the refrigerant; Refrigerant between the vessel A valve body for controlling communication of the road, is composed of a temperature sensitive material, those having a temperature sensitive compensating spring for urging the valve body in the valve closing direction.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the first aspect of the present invention, the bellows device is subjected to the temperature of the refrigerant at the outlet side of the radiator, and the charged refrigerant according to the heat transmitted to the charged refrigerant. Expands and contracts due to the pressure of the density of
The valve body is opened and closed by the expansion and contraction of the bellows device,
The degree of communication of the refrigerant passage between the radiator and the evaporator is controlled,
Then, the initial bellows length of the bellows device changes according to the temperature of the refrigerant at the outlet side of the radiator by the density correction thermosensitive member, and the density of the charged refrigerant changes.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the second aspect of the present invention, the bellows device is fixed by the density correction thermosensitive member provided between the fixed side member and the fixed end of the bellows device. The connection position of the end to the fixed side member is changed according to the temperature of the refrigerant on the outlet side of the radiator, and the change in the connection position changes the initial bellows length of the bellows device and the density of the charged refrigerant.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the third aspect of the present invention, the free end of the bellows device is controlled by the density correction thermosensitive member provided between the free end and the valve holding member. The position is changed, and the change in the position of the free end changes the initial bellows length of the bellows device, and changes the density of the charged refrigerant.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle apparatus according to the fourth aspect of the present invention, the initial bellows length of the bellows device is extended according to the temperature rise by the density correction thermosensitive member, and is increased according to the temperature rise. The density of the filled refrigerant is reduced.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the fifth aspect of the present invention, the bellows device is subjected to the temperature of the refrigerant at the outlet side of the radiator, and the charged refrigerant according to the heat transmitted to the charged refrigerant. Expands and contracts due to the pressure of the density of
The valve body is opened and closed by the expansion and contraction of the bellows device,
The degree of communication of the refrigerant passage between the radiator and the evaporator is controlled,
Then, the valve-opening force is changed by a temperature-sensitive compensation spring formed of a temperature-sensitive material, and the valve opening pressure is changed according to the temperature.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the sixth aspect of the present invention, the bellows device is affected by the temperature of the refrigerant at the outlet side of the radiator, and the charged refrigerant according to the heat transmitted to the charged refrigerant. Expands and contracts due to the pressure of the density of
The valve body is opened and closed by the expansion and contraction of the bellows device,
The degree of communication of the refrigerant passage between the radiator and the evaporator is controlled,
Then, the valve-closing force is changed by a temperature-sensitive compensation spring formed of a temperature-sensitive material, and the valve opening pressure is changed according to the temperature.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment for a supercritical vapor compression refrigeration cycle apparatus to which a high-pressure control valve according to the present invention is applied.

This refrigeration cycle apparatus has a compressor 1, a radiator (gas cooler) 2, an evaporator 3, and an accumulator 4, which are connected to each other by refrigerant pipes 5, 6, 7 in a closed loop. A refrigerant such as carbon dioxide gas circulates through the closed loop.

In the middle of the refrigerant passage 6 extending from the radiator 2 to the evaporator 3, the communication between the radiator 2 and the evaporator 3 is controlled in response to the pressure and temperature of the refrigerant at the outlet side of the radiator 2. A high-pressure control valve 8 for quantitatively controlling the temperature and controlling the pressure on the outlet side of the radiator; and a differential pressure between the pressure of the refrigerant on the outlet side of the radiator 2 and the pressure of the refrigerant on the inlet side of the evaporator 3 is predetermined. A relief valve 9 that opens when the value is greater than or equal to the value is provided in parallel with each other.

Next, a first embodiment of the high-pressure control valve 8 according to the present invention will be described with reference to FIGS. The high-pressure control valve 8 has a valve housing 10. Valve housing 10
The inlet port (high pressure side port) 11 to which the refrigerant pipe on the outlet side of the radiator 2 is connected, the outlet port 12 to which the refrigerant pipe on the inlet side of the evaporator 3 is connected, and the inlet port 11 through the communication hole 13. And a valve port 16 opened at the bottom of the valve chamber 14 and communicating the valve chamber 14 to the outlet port 12 via the internal passage 15.

The valve chamber 14 is provided with a valve element 17 for opening and closing a valve port 16 and a bellows device 18. The bellows device 18 includes a bellows body 20 having an upper end member 19 integrally connected to an upper end serving as a fixed end, a sealed gas pipe 21 connected to the upper end member 19 for sealing gas inside the bellows, and an internal conduit 22. A lower end member 24 welded to the lower end of the bellows main body 20 to close a lower end serving as a free end of the bellows main body 20, and a valve holding member 25 fixedly connected to the lower end member 24. , An internal spring 26, and the valve element 17 is attached to the lower bottom of the valve holding member 25. The lower end member 24 has a communication hole 27 penetrating therethrough.

The bellows device 18 defines a sealed chamber 18A. The sealed chamber 18A is filled with the same carbon dioxide gas as the refrigerant by a sealed gas pipe 21 and an internal conduit 22.

An adjusting screw member 28 is screw-engaged with the valve housing 10, and a disc spring-shaped upper bimetal 29 serving as a density correction thermosensitive member is sandwiched between the adjusting screw member 28 and the upper member 23. A disc spring-shaped lower bimetal 31 serving as a density correction temperature sensing member is sandwiched between the upper member 23 and the step portion 30 of the valve chamber 14. As a result, the upper member 23 is fixed to the valve housing 10 which is a fixed-side member, with the upper bimetal 29 and the lower bimetal 31 sandwiched vertically.

Upper bimetal 29, lower bimetal 31
Has a low expansion material 29a, 31a on the upper side and a high expansion material 29b, 31b on the lower side.
In response to the temperature of the refrigerant at the outlet side of the radiator 2 introduced into the radiator 4, at the time of low temperature, the upper member 23 has a shape as shown in FIG. At times, the upper member 23 is deformed into a shape as shown in FIG. This means that the connection position of the fixed end of the bellows device 18 with respect to the fixed side member (the valve housing 10) is changed.

The bellows device 18 is affected by the temperature of the refrigerant on the outlet side of the radiator 2, expands and contracts by the pressure of the density of the sealed refrigerant according to the heat transmitted to the sealed refrigerant, and drives the valve 17 up and down.

As a result, the valve 17 opens the valve port 16 in accordance with the temperature of the refrigerant at the outlet side of the radiator 2, in other words, the communication of the refrigerant passage between the radiator 2 and the evaporator 3. Control the pressure at the outlet side of the radiator.

When the temperature of the refrigerant at the outlet side of the radiator 2 is low, the upper bimetal 29 and the lower bimetal 31
The upper member 23 is located at a lower position in a shape as shown in FIG. 3, but when the temperature of the refrigerant at the outlet side of the radiator 2 increases, the upper bimetal 29 and the lower bimetal 31
Is transformed into a shape as shown in FIG.
3 is located at the upper position. As a result, the bellows device 18 extends upward, that is, the initial bellows length of the bellows device 18 increases, and accordingly, the bellows device 1
8 increases, and the density of the refrigerant charged in the bellows device 18 decreases.

As described above, when the temperature is high, the bellows device 1
(20 ° C., 6.5)
The density of carbon dioxide in MPa) is 800 kg / m ³ ,
(40 ° C., 11.5 MPa), the density of carbon dioxide is 7
The density can be changed to 00 kg / m ^3, the pressure-temperature characteristics as shown by the broken line in FIG. 8 can be obtained, and the COP of the frozen cycle can be set to the maximum value.

At a high temperature, the rate of increase of the bellows internal pressure due to the temperature is smaller than at a low temperature. By suppressing the increase in the internal pressure at a high temperature, the heat resistance of the bellows device 18 is improved.

FIGS. 4 and 5 show another embodiment of the high-pressure control valve according to the present invention. 4 and 5, parts corresponding to those in FIGS. 2 and 3 are denoted by the same reference numerals as those in FIGS. 2 and 3, and description thereof is omitted.

In this embodiment, the position of the upper member 23 serving as a fixed end with respect to the valve housing 10 is determined by an adjusting screw member 28 so as to be adjustable. The lower end of the bellows device 18 is a free end, and the upper side of the cup-shaped valve holding member 33 is fixedly connected to an intermediate portion of the bellows device 18 by a connection member 32. The valve holding member 33 surrounds the free end side of the bellows device 18, and has a valve body 1 at the lower bottom.
7 is held.

The lower end member 24 of the bellows device 18 is provided with a bimetal 34 serving as a density correction temperature sensing member. The bimetal 34 exists in a form sandwiched between the lower end member 24 and the bottom of the valve holding member 33. The bimetal 34 has a low expansion material 34a attached to the lower side and a high expansion material 34b attached to the upper side.
Sensitive to the temperature of the refrigerant on the outlet side of the radiator 2 introduced into the
When the temperature is low, the lower end member 24 is formed in the shape shown in FIG. 4, and the lower end member 24 is deformed into the shape shown in FIG. To the lower part. This means that the position of the free end of the bellows device 18 is changed.

Also in this embodiment, the bellows device 18
Is affected by the temperature of the refrigerant on the outlet side of the radiator 2, expands and contracts by the pressure of the density of the sealed refrigerant according to the heat transmitted to the sealed refrigerant, and drives the valve 17 up and down. This allows
The valve body 17 controls the degree of opening of the valve port 16, in other words, the degree of communication of the refrigerant passage between the radiator 2 and the evaporator 3, in accordance with the temperature of the refrigerant on the outlet side of the radiator 2, Perform pressure control on the outlet side of the vessel.

When the temperature of the refrigerant at the outlet side of the radiator 2 is low, the bimetal 34 has a shape as shown in FIG. When the temperature of the refrigerant on the outlet side of the first metal becomes high, the bimetal 34 is deformed into a shape as shown in FIG. 5 and the lower end member 24 is positioned at the lower position. As a result, the bellows device 18 extends downward, that is, the initial bellows length of the bellows device 18 increases, and accordingly the internal volume of the bellows device 18 increases, and the bellows device 1
8, the density of the filled refrigerant decreases.

Also in this embodiment, as described above, at high temperatures, the density of the refrigerant charged in the bellows device 18 decreases, so that the density of carbon dioxide at (20 ° C., 6.5 MPa) is 800 kg / m ³ , The density of carbon dioxide at 40 ° C. and 11.5 MPa) can be changed to 700 kg / m ³ , and the pressure-temperature characteristics shown by the broken line in FIG. Saquil's COP
Can be set to the maximum value.

At a high temperature, the rate of increase of the bellows internal pressure due to the temperature is smaller than at a low temperature. By suppressing the increase in the internal pressure at a high temperature, the heat resistance of the bellows device 18 is improved.

In any of the above-mentioned embodiments, the bimetal constituting the density correction thermosensitive member can be replaced by a member made of a thermosensitive material such as a shape memory alloy.

FIG. 6 shows another embodiment of the high-pressure control valve according to the present invention. In FIG. 6, FIG.
Parts corresponding to those in FIG. 3 are denoted by the same reference numerals as those in FIGS. 2 and 3, and description thereof is omitted.

In this embodiment, a temperature-sensitive compensation spring 35 made of a shape-memory alloy, which is a temperature-sensitive material, is provided between the valve holding member 25 and the bottom of the valve chamber 14.
Urges the valve body 17 in the valve opening direction. The temperature-sensitive compensation spring 35 made of a shape memory alloy is in the valve chamber 14 and responds to the refrigerant temperature at the outlet side of the radiator 2, and has a low spring force at low temperatures.
At high temperatures, the spring force increases.

Therefore, when the temperature is high, the valve opening pressure of the high-pressure control valve 8 is lower than when the temperature is low, and the temperature is compensated.

FIG. 7 shows another embodiment of the high-pressure control valve according to the present invention. In FIG. 7, FIG.
Parts corresponding to those in FIG. 3 are denoted by the same reference numerals as those in FIGS. 2 and 3, and description thereof is omitted.

In this embodiment, the internal spring 26 of the bellows device 18 is made of a shape-memory alloy which is a temperature-sensitive material. The internal spring 26 forms a temperature-sensitive compensation spring and urges the valve element 17 in the valve closing direction. The internal spring 26 made of a shape memory alloy is located in the valve chamber 14 and is sensitive to the temperature of the refrigerant at the outlet side of the radiator 2. The spring force is weak at low temperatures and strong at high temperatures.

Therefore, when the temperature is high, the valve opening pressure of the high-pressure control valve 8 is increased as compared with when the temperature is low, and the temperature is compensated.

[0047]

As can be understood from the above description, according to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the first aspect of the present invention, the bellows device controls the temperature of the refrigerant at the outlet side of the radiator. The valve expands and contracts due to the pressure due to the density of the sealed refrigerant according to the heat transmitted and transmitted to the sealed refrigerant, and the expansion and contraction of this bellows device drives the valve to open and close, controlling the degree of communication of the refrigerant passage between the radiator and the evaporator. Then, the initial bellows length of the bellows device changes according to the temperature of the refrigerant at the outlet side of the radiator by the density correction thermosensitive member, and the density of the sealed refrigerant changes. The refrigerant pressure at the outlet side of the radiator can be controlled so that the refrigeration cycle apparatus operates, and the supercritical vapor compression refrigeration cycle apparatus can operate at the maximum COP.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the second aspect of the present invention, the bellows device is fixed by the density correction temperature sensing member provided between the fixed side member and the fixed end of the bellows device. The connection position of the end with respect to the fixed side member is changed according to the temperature of the refrigerant on the outlet side of the radiator, and the change in the connection position changes the initial bellows length of the bellows device, and the density of the enclosed refrigerant changes. The refrigerant pressure at the outlet of the radiator can be controlled so that the supercritical vapor compression refrigeration cycle apparatus operates at the COP, and the supercritical vapor compression refrigeration cycle apparatus can operate at the maximum COP.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the third aspect of the present invention, the free end of the bellows device is controlled by the density correction temperature sensing member provided between the free end and the valve holding member. The position is changed, and the change in the position of the free end changes the initial bellows length of the bellows device, and changes the density of the charged refrigerant.

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the fourth aspect of the present invention, the initial bellows length of the bellows device is extended by the density correction thermosensitive member in accordance with the temperature rise, and is increased in response to the temperature rise. Since the density of the enclosed refrigerant is reduced, the refrigerant pressure at the outlet side of the radiator can be controlled so that the supercritical vapor compression refrigeration cycle apparatus operates at the maximum COP, and the supercritical vapor compression refrigeration cycle apparatus can operate at the maximum COP. .

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the fifth aspect of the present invention, the bellows device is subjected to the temperature of the refrigerant at the outlet side of the radiator, and the charged refrigerant according to the heat transmitted to the charged refrigerant. Expands and contracts due to the pressure of the density of
The valve body is opened and closed by the expansion and contraction of the bellows device,
The degree of communication of the refrigerant passage between the radiator and the evaporator is controlled,
In addition, the valve opening force is changed by a temperature-sensitive compensation spring made of a temperature-sensitive material, and the valve opening pressure is changed in accordance with the temperature. Can work with

According to the high pressure control valve for a supercritical vapor compression refrigeration cycle device according to the sixth aspect of the present invention, the bellows device is subjected to the temperature of the refrigerant at the outlet side of the radiator, and the charged refrigerant according to the heat transmitted to the charged refrigerant. Expands and contracts due to the pressure of the density of
The valve body is opened and closed by the expansion and contraction of the bellows device,
The degree of communication of the refrigerant passage between the radiator and the evaporator is controlled,
In addition, the valve-closing force is changed by a temperature-sensitive compensation spring made of a temperature-sensitive material, and the valve opening pressure is changed according to the temperature. Can work with

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment for a supercritical vapor compression refrigeration cycle apparatus to which a high-pressure control valve according to the present invention is applied.

FIG. 2 is a cross-sectional view of one embodiment of a high-pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention at a low temperature.

FIG. 3 is a cross-sectional view at a high temperature showing one embodiment of the high-pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention.

FIG. 4 is a cross-sectional view at a low temperature showing another embodiment of the high-pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention.

FIG. 5 is a cross-sectional view at a high temperature showing another embodiment of the high-pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention.

FIG. 6 is a cross-sectional view showing another embodiment of the high-pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the high-pressure control valve for a supercritical vapor compression refrigeration cycle device according to the present invention.

FIG. 8 is a vapor pressure diagram of carbon dioxide.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressor 2 radiator 3 evaporator 8 high-pressure control valve 9 relief valve 10 valve housing 14 valve chamber 16 valve port 17 valve element 18 bellows device 26 internal spring 29 upper bimetal 31 lower bimetal 33 valve holding member 34 bimetal 35 temperature compensation Spring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yu Oi 535 Sasai, Sayama City, Saitama Prefecture Saginomiya Works Sayama Plant F-term (reference) 3H057 AA04 BB01 CC06 DD12 FC03 FD19 GG08 3H059 AA08 BB01 CD05 CF14 DD17 EE01 FF01 FF11

Claims (6)

[Claims] 1. A refrigerant flowing from the radiator to the evaporator in a supercritical vapor compression refrigeration cycle device operated in a supercritical region, in which a refrigerant such as carbon dioxide gas circulates sequentially through a compressor, a radiator, and an evaporator. It is provided in the middle of the passage, and controls the degree of communication of the refrigerant passage between the radiator and the evaporator in response to the temperature of the refrigerant on the outlet side of the radiator to control the pressure on the radiator outlet side. A high-pressure control valve, wherein the bellows device defines a closed chamber for refrigerant charging, is subjected to the temperature of the refrigerant on the outlet side of the radiator, and expands and contracts by pressure due to the density of the charged refrigerant according to the heat transmitted to the charged refrigerant. A density correction thermosensitive member that is affected by the temperature of the refrigerant on the outlet side of the radiator, changes the initial bellows length of the bellows device according to the temperature, and changes the density of the sealed refrigerant, and is connected to the bellows device. And the bellows device A supercritical steam having a valve body that is opened and closed by expansion and contraction and cooperates with a valve port to control the degree of communication of a refrigerant passage between the radiator and the evaporator. High pressure control valve for compression refrigeration cycle equipment. 2. The bellows device has one end connected to a fixed side member to be a fixed end, the other end being a free end, holding the valve body at the free end, and fixing the valve body to the fixed side member. A density correction thermosensitive member made of a thermosensitive material is provided between the ends,
The high pressure control valve for a supercritical vapor compression refrigeration cycle apparatus according to claim 1, wherein a connection position of the fixed end to the fixed side member is changed by the density correction temperature sensing member. 3. The bellows device has one end connected to a fixed side member to be a fixed end, the other end being a free end, a valve holding member connected to an intermediate portion, and the valve body being connected to the valve body. Is attached, a density correction thermosensitive member made of a thermosensitive material is provided between the free end and the valve holding member, and the position of the free end is changed by the density correction thermosensitive member. The high pressure control valve for a supercritical vapor compression refrigeration cycle device according to claim 1. 4. The density correction thermosensitive member according to claim 1, wherein the bellows device extends the initial bellows length according to a temperature rise to reduce the density of the charged refrigerant. 2. A high-pressure control valve for a supercritical vapor compression refrigeration cycle device according to item 1. 5. A refrigerant from the radiator to the evaporator of a supercritical vapor compression refrigeration cycle device operated in a supercritical region, in which a refrigerant such as carbon dioxide gas circulates sequentially through a compressor, a radiator, and an evaporator. It is provided in the middle of the passage, and controls the degree of communication of the refrigerant passage between the radiator and the evaporator in response to the temperature of the refrigerant on the outlet side of the radiator to control the pressure on the radiator outlet side. A high-pressure control valve, wherein the bellows device defines a closed chamber for refrigerant charging, is subjected to the temperature of the refrigerant on the outlet side of the radiator, and expands and contracts by pressure due to the density of the charged refrigerant according to the heat transmitted to the charged refrigerant. A valve body connected to the bellows device, driven to open and close by expansion and contraction of the bellows device, and cooperating with a valve port to control the degree of communication of a refrigerant passage between the radiator and the evaporator; It is made of material and the valve body is opened 1. A high-pressure control valve for a supercritical vapor compression refrigeration cycle device, comprising: 6. A refrigerant from the radiator to the evaporator of a supercritical vapor compression refrigeration cycle device operated in a supercritical region, in which a refrigerant such as carbon dioxide gas circulates sequentially through a compressor, a radiator, and an evaporator. It is provided in the middle of the passage, and controls the degree of communication of the refrigerant passage between the radiator and the evaporator in response to the temperature of the refrigerant on the outlet side of the radiator to control the pressure on the radiator outlet side. A high-pressure control valve, wherein the bellows device defines a closed chamber for refrigerant charging, is subjected to the temperature of the refrigerant on the outlet side of the radiator, and expands and contracts by pressure due to the density of the charged refrigerant according to the heat transmitted to the charged refrigerant. A valve body connected to the bellows device, driven to open and close by expansion and contraction of the bellows device, and cooperating with a valve port to control the degree of communication of a refrigerant passage between the radiator and the evaporator; It is made of material and the valve is closed 1. A high-pressure control valve for a supercritical vapor compression refrigeration cycle device, comprising: