KR20060061258A - Pressure control valve - Google Patents

Abstract

According to the present invention, the pressure of the refrigerant at the outlet side of the gas cooler can be appropriately adjusted according to the refrigerant temperature at the outlet side, and at the same time, the pressure can be simplified to simplify the configuration, reduce the number of parts, and reduce the processing assembly cost. Provide a control valve. The present invention introduces a compressor (101) for circulating CO ₂ as a refrigerant, a gas cooler (102) for cooling the refrigerant compressed by the compressor (101), and a refrigerant from the gas cooler (102). Vapor compression refrigeration cycle (100A) having an evaporator 104 to be used and an internal heat exchanger (103) for performing heat exchange between the refrigerant on the outlet side of the evaporator (104) and the refrigerant on the outlet side of the gas cooler (102). The refrigerant inserted into the gas cooler 102 via the internal heat exchanger 103 is regulated according to the refrigerant temperature at the outlet side of the gas cooler 102 to be led to the evaporator 104. It has a thermostat chamber 30 for sensing the refrigerant temperature of the outlet side of the gas cooler 102, and the thermostat chamber 25 to communicate with the thermostat tube 30 through a capillary tube 32, A thermostatic pressure response element 20 which drives the valve body 15 in the opening and closing direction in response to a change in the internal pressure of 25), and a valve body 10A to which the element 20 is integrally mounted. In the thermostat chamber 30 and the thermostat chamber 25, in order to adjust the refrigerant pressure at the outlet side of the gas cooler 102 so as to obtain a maximum coefficient of performance with respect to the refrigerant temperature at the outlet side of the gas cooler 102, While CO ₂ is sealed at a predetermined density, an inert gas is filled and sealed.

Pressure Control Valves, Compressors, Gas Coolers, Heat Exchangers, Thermostats

Description

PRESSURE CONTROL VALVE

1 is a longitudinal sectional view showing a first embodiment of a pressure control valve according to the present invention;

2 shows an example of a steam compression refrigeration cycle in which the pressure control valve of the first embodiment is inserted.

3 is a partially enlarged view for explaining the junction of the diaphragm and the valve body.

4 is an enlarged view showing an example of the dust-proof spring.

5 is a longitudinal sectional view showing a second embodiment of the pressure control valve according to the present invention;

6 is a longitudinal sectional view showing a third embodiment of the pressure control valve according to the present invention;

7 is a plan view showing a fourth embodiment of the pressure control valve according to the present invention;

8 is a right side view showing the fourth embodiment of the pressure control valve according to the present invention;

9 shows an example of a steam compression refrigeration cycle in which the pressure control valve of the fourth embodiment is inserted.

10 is a view showing an example of a method of improving the temperature sensitivity of the temperature-sensitive room.

11 is a longitudinal sectional view showing a fifth embodiment of a pressure control valve according to the present invention;

12 is a plan view of the pressure control valve shown in FIG.

FIG. 13 is a left side view of the pressure control valve shown in FIG.

14 is a view showing an example of a steam compression refrigeration cycle in which the pressure control valve of the fifth embodiment is inserted.

15 is a partially enlarged view for explaining the junction of the diaphragm and the valve body.

16 is a longitudinal sectional view showing a sixth embodiment of a pressure control valve according to the present invention;

17 is a plan view of the pressure control valve shown in FIG.

18 is a longitudinal sectional view showing a seventh embodiment of a pressure control valve according to the present invention;

19 is a longitudinal sectional view showing an eighth embodiment of a pressure control valve according to the present invention;

20 is a left side view of the pressure control valve shown in FIG. 19;

21 is a view showing an example of a conventional steam compression refrigeration cycle in which the pressure control valve is inserted.

* Description of the symbols for the main parts of the drawings *

1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H: Pressure control valve

10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H: valve body

11 pressure adjustment inlet 12 pressure adjustment outlet

13: valve seat 18: dustproof spring

20: thermostatic pressure response element 21: diaphragm

22: lid member 23: lid receiving member

25: thermostat room 30: thermostat

32, 34, 39: capillary 61: temperature inlet

62: temperature outlet 100A, 100B: steam compression refrigeration cycle

102 gas cooler 103 internal heat exchanger

104: evaporator

The present invention relates to a pressure control valve which is inserted into a vapor compression refrigeration cycle (CO ₂ cycle) in which CO ₂ is used as the refrigerant, and adjusts the refrigerant pressure at the outlet side of the gas cooler (radiator) according to the refrigerant temperature. In particular, the present invention relates to a pressure control valve suitable for a vapor compression refrigeration cycle employed in a car air conditioner or the like having an internal heat exchanger for performing heat exchange between the refrigerant at the evaporator outlet side and the refrigerant at the gas cooler outlet side.

21 shows an example of a steam compression refrigeration cycle in which a pressure control valve of this type is inserted. In the illustrated refrigeration cycle 100, a compressor 101 for circulating CO ₂ as a refrigerant, a gas cooler (heat radiator) 102 for cooling the refrigerant compressed by the compressor 101, and this gas cooler ( An evaporator 104 into which the refrigerant from the gas flows in 102, an internal heat exchanger 103 for performing heat exchange between the refrigerant on the outlet side of the evaporator 104 and the refrigerant on the outlet side of the gas cooler 102, and an evaporator ( An accumulator (gas-liquid separator) which separates the refrigerant from the gaseous phase refrigerant and the liquid phase refrigerant into the suction side of the compressor 101 via the heat exchanger 103, and accumulates the excess refrigerant ( 105 and a pressure control valve for coordinating the refrigerant flowing from the gas cooler 102 via the internal heat exchanger 103 in accordance with the refrigerant temperature at the outlet side of the gas cooler 102 to guide the evaporator 104 ( 110).

The pressure control valve 110 is installed to efficiently operate the refrigeration cycle 100, in other words, the gas cooler 102 so as to obtain a maximum grade coefficient with respect to the refrigerant temperature at the outlet side of the gas cooler 102. To adjust the refrigerant pressure at the outlet side (e.g., when the refrigerant temperature at the outlet side is 40 deg. C, if the refrigerant pressure at the outlet side is 10 MPa, for example, if the grade coefficient becomes the maximum, the outlet side is To control the refrigerant pressure to be 10 MPa). For example, as described in Patent Document 1 below, a pressure adjusting inlet for introducing refrigerant from the gas cooler 102 via the internal heat exchanger 103 ( 111 and the coolant outlet port 112 for adjusting the refrigerant to the evaporator 104 according to the refrigerant temperature at the outlet side of the gas cooler 102 and the sense of inflow of the coolant from the gas cooler 102. Warm inlet 113 and it A temperature-sensitive outlet 114 for leading to the internal heat exchanger 103, a temperature-sensitive introduction chamber (not shown below) provided between the temperature-sensitive inlet 113 and the outlet 114; A thermosensitive pressure sensing element having a thermosensitive chamber for sensing the temperature of the refrigerant introduced into the warming introduction chamber, and in response to a change in the internal pressure of the thermosensitive chamber to drive the valve main body in the opening and closing direction, and a valve main body including the element (Fig. And a spring member provided in the valve body to pressurize the valve body in a direction of reducing the valve opening degree (closed valve direction), and the valve opening degree (lift amount of the valve body) is It is decided by the equilibrium relationship between the opening valve force by the differential pressure inside and outside the said temperature reduction chamber, and the closing valve force by the said spring member.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2001-81157

In the pressure control valve as described above, the demand for cost reduction is increasing in recent years, and there is a strong demand for simplification of configuration, reduction of the number of parts, reduction of processing assembly cost, and the like.

SUMMARY OF THE INVENTION The present invention has been made to meet such a demand, and an object of the present invention is to adjust the refrigerant pressure at the outlet side of the cascooler according to the refrigerant temperature at the outlet side, and to simplify the configuration and the components. An object of the present invention is to provide a pressure control valve capable of effectively reducing water, reducing processing assembly costs, and the like.

In order to achieve the above object, a first aspect of the pressure control valve according to the present invention basically includes a compressor for circulating CO ₂ as a refrigerant, a gas cooler for cooling the refrigerant compressed by the compressor, and A vapor compression refrigeration cycle having an evaporator into which a refrigerant from a gas cooler is introduced and an internal heat exchanger for exchanging heat between the refrigerant on the outlet side of the evaporator and the refrigerant on the outlet side of the gas cooler; The refrigerant introduced through the internal heat exchanger is regulated according to the refrigerant temperature at the outlet side of the gas cooler to be led to the evaporator.

And a thermostat chamber for sensing a refrigerant temperature at the outlet side of the gas cooler, and a thermostat chamber in communication with the thermostat tube through a capillary tube, the valve body being driven in the opening and closing direction in response to a change in the internal pressure of the thermostat chamber. A thermostatic pressure actuating element and a valve body to which the element is integrally mounted, wherein the thermostat and the thermostat chamber have an outlet of the gas cooler such that a maximum grade coefficient is obtained with respect to a refrigerant temperature on the outlet side of the gas cooler. In order to regulate the refrigerant pressure at the side, CO ₂ is sealed at a predetermined density, and an inert gas is filled and sealed.

Further, the second aspect of the pressure control valve according to the present invention is basically a compressor for circulating CO ₂ as a refrigerant, a gas cooler for cooling the refrigerant compressed by the compressor, and a refrigerant from the gas cooler. Is disposed near the gas cooler or its outlet in a vapor compression refrigeration cycle having an evaporator into which is introduced and an internal heat exchanger that performs heat exchange between the refrigerant at the outlet side of the evaporator and the refrigerant at the outlet side of the gas cooler. The refrigerant introduced from the gas cooler via the internal heat exchanger is regulated according to the refrigerant temperature at the outlet side of the gas cooler to be led to the evaporator.

And a thermostatic chamber for sensing a refrigerant temperature at the outlet side of the gas cooler, the thermostatic pressure actuating element driving the valve body in the opening and closing direction in response to a change in the internal pressure of the thermostat chamber, and the element integrally. The valve body is provided, and the temperature reduction chamber has a predetermined density of CO _{2 in} order to adjust the refrigerant pressure at the outlet side of the gas cooler so that the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler. In addition to being sealed in, it is characterized in that the inert gas is filled and filled.

Preferably, the valve body is provided with a coolant inlet / outlet, a mounting portion of the element, a valve seat portion in which the valve body is folded, and the like in a substantially rectangular parallelepiped cut out from a cross-sectional rectangular push rod.

In a preferred embodiment, at least one of a male screw portion, a flange portion, and a female thread portion or an insertion hole for bolts provided for mounting to the gas cooler or internal heat exchanger is provided.

Preferably, the thermosensitive pressure actuating element seals a diaphragm, a lid member having a cross-sectional inverse concave shape that cooperates with the diaphragm to form the thermal sensing chamber, and an outer peripheral portion of the diaphragm in cooperation with the lid member. And a cylindrical lid accommodating member having a flange-shaped portion fitted into the valve body so as to slide freely, and a male screw portion provided on the outer periphery of the cylindrical portion of the lid accommodating member for attachment to the valve body. do.

자형으로 전체가 원환모양인 바닥부와, 상기 바닥부의 내주로부터 돌출하여 상기 밸브 본체의 외주면에 탄발적으로 압접하는 복수의 혀 모양 요곡편부로 구성된다.In another preferable aspect, the vibration damping spring for suppressing the vibration of the said valve main body is arrange | positioned in the said valve main body. In this case, the anti-vibration spring is preferably formed of an elastic plate material, and is formed on the end face pressed against the valve body by the lid accommodating member.

A bottom portion having an annular shape in its entirety and a plurality of tongue-shaped curved piece portions protruding from the inner circumference of the bottom portion and elastically contacting the outer circumferential surface of the valve body.

In another preferred embodiment, the valve body and the diaphragm are arranged coaxially, and one end of the valve body and the diaphragm are joined by projection welding.

In another preferred embodiment, the diaphragm has a bottom cylindrical shape having a bottom surface, and the outer peripheral edge portion and the cylindrical portion of the diaphragm are sandwiched by the lid member and the lid housing member, and the alignment portions thereof are fitted. The lower end is joined by full perimeter welding.

The lid accommodating member is preferably divided into a cylindrical portion provided with a male threaded portion and a flange-like portion, and the flange-shaped portion is produced by pressing a sheet material.

In the pressure control valve of the said 2nd aspect, Preferably, the thermosensitive fin is provided in the outer periphery of the said thermosensitive chamber, or the tubular body or lid-shaped body which has a thermosensitive fin is deposited.

Moreover, in another preferable aspect, the said valve main body is divided into the axial part and the large diameter part, and several bleed notch is formed in the valve seat of the said valve main body.

The third aspect of the pressure control valve according to the present invention basically includes a compressor for circulating CO ₂ as a refrigerant, a gas cooler for cooling the refrigerant compressed by the compressor, and a refrigerant from the gas cooler. A refrigerant that is inserted into a vapor compression refrigeration cycle having an evaporator, and an internal heat exchanger for performing heat exchange between the refrigerant at the outlet side of the evaporator and the refrigerant at the outlet side of the gas cooler, and is introduced through the internal heat exchanger from the gas cooler. Is regulated according to the refrigerant temperature at the outlet side of the gas cooler to lead to the evaporator.

And a thermal inlet for introducing a refrigerant from the gas cooler, a thermal outlet for leading the same to the internal heat exchanger, a thermal introduction chamber provided between the thermal inlet and the outlet, and the thermal introduction chamber. It has a temperature sensing chamber which senses the temperature of the refrigerant | coolant introduced into the inside, and responds to the change of the internal pressure of the temperature sensing chamber, and has the temperature-sensitive pressure response element which drives a valve main body in the opening-closing direction, and the valve main body in which the said element is integrally mounted, In the temperature reduction chamber, CO ₂ is sealed at a predetermined density to control the refrigerant pressure at the outlet side of the gas cooler so as to obtain a maximum grade coefficient with respect to the refrigerant temperature at the outlet side of the gas cooler. Is filled and sealed.

The valve body is preferably formed of a temperature-sensitive inlet and outlet, the temperature-sensitive inlet, the pressure inlet and outlet, the mounting portion of the element, and the valve, to a mute material cut out from a cross-section cross or rectangular push rod. A valve seat portion or the like in which the main body is folded is formed.

In a preferable embodiment, a guide hole is formed above the valve seat in the valve body so that the valve body slides freely, and above the guide hole, the temperature inlet and outlet and the temperature introduction chamber. Is formed, and the pressure adjusting inlet and outlet and the valve chamber are formed below the guide hole.

In another preferred form, at least one of a male screw portion, a flange portion, and a female screw portion or an insertion hole for bolts provided for installation to the gas cooler, a pipe joint for an evaporator, or an internal heat exchanger is provided.

The thermostatic pressure actuating element preferably includes a diaphragm, a lid member having a cross-sectional inverse concave shape that cooperates with the diaphragm to form the thermal sensing chamber, and an outer peripheral portion of the diaphragm in cooperation with the lid member. At the same time, the valve body is provided with a cylindrical lid housing member having a flange portion inserted into the inner circumference thereof, and a male screw portion provided for attachment to the valve body is provided on the outer circumference of the cylindrical portion of the lid housing member.

In another preferable aspect, the valve body and the diaphragm are coaxially arranged, and one end of the valve body and the diaphragm are joined by projection welding.

According to another preferred aspect, the valve body comprises a cylindrical valve rod and a valve body portion provided at the lower end of the valve rod, and the valve rod is composed of a shaft portion and a large diameter portion that is integrally set or supported and fixed to the upper end of the shaft portion. The diaphragm is joined to an upper surface of the large diameter portion.

In another preferable aspect, the temperature introduction chamber is formed between the valve rod of the valve body and the cylindrical portion of the lid housing member.

In still another preferred embodiment, the valve body is provided with a vertical plate opening of an upper surface opening, and a through hole is formed in the diaphragm so as to communicate the thermal chamber with the vertical plate hole. The opening constitutes one expansion thermostat.

In another preferred embodiment, the diaphragm is in the form of a unitary cylinder having a bottom surface, and the outer peripheral edge and the cylindrical portion of the diaphragm are sandwiched and sealed with the lid member and the lid housing member, and at the same time, the lower end portion of the fitting portion is entirely closed. It is joined by circumferential welding.

In still another preferred aspect, the valve body is provided with a groove for blocking heat transfer between the temperature inlet and outlet and the pressure adjusting inlet and the outlet, around the periphery, and in the valve body valve seat, A plurality of bleed notches are formed, and a plurality of annular grooves are formed in the valve rod of the valve body.

EXAMPLE

Hereinafter, an embodiment of the pressure control valve of the present invention will be described with reference to the drawings.

1 is a longitudinal sectional view showing a first embodiment of a pressure control valve according to the present invention. The pressure control valve 1A of the first embodiment shown is inserted into a vapor compression refrigeration cycle 100A, which is basically the same as that shown in FIG. 11 described above, as shown in FIG. 2, and the gas cooler 102. The refrigerant introduced through the internal heat exchanger 103 is regulated according to the refrigerant temperature at the outlet side of the gas cooler 102 to be led to the evaporator 104. At this time, in the refrigerating cycle 100A shown in FIG. 2, the same components or the same functional parts as those of the respective parts of the refrigerating cycle 100 shown in FIG. 11 are denoted by the same reference numerals, and redundant description thereof is omitted.

The pressure control valve 1A is provided to operate the refrigeration cycle 100A efficiently, in other words, the gas cooler 102 so that the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler 102. And a valve body 15 composed of a valve body 10A, a valve rod 15A and a conical valve body portion 15B provided at a lower end thereof, and a temperature reduction pressure. Both the oscillation element 20 and the cylindrical thermosensitive cylinder 30 whose both ends were narrowed conically in the shape of the heat conductive metal material which senses the refrigerant temperature of the exit side of the gas cooler 102 are provided.

The valve main body 10A has a pressure inlet (seam part) 11 open to the side including an inlet passage part 11a for introducing refrigerant from the gas cooler 102 via the internal heat exchanger 103. And a tank opened on the side opposite to the inlet 11 including an outlet passage portion 12a for regulating the refrigerant according to the refrigerant temperature at the outlet side of the gas cooler 102 and leading it to the evaporator 104. And a conical valve seat portion 13 provided at an upper end of the pressure outlet port (seam part) 12 and the outlet passage part 12a, and the valve body part 15B of the valve body 15 is folded. The valve chamber 14 formed on the valve seat 13 and the female screw part 10b for attaching the temperature-sensitive pressure actuating element 20 to the valve body 10A are provided. At this time, a small bleed notch (not shown in the drawing) is formed in the valve seat 13, and the valve opening degree of the control valve is the valve seat 13 of the valve body 15 (valve body 15B). Corresponds to the lift amount from. Notch formation of the valve seat portion 13 facilitates processing of the outlet passage portion 12a and has a self-cleaning effect when the control valve is used.

The thermosensitive pressure actuating element 20 has a single cylinder diaphragm 21 having a bottom surface, and a lid member having a cross-sectional inverse concave shape cooperating with the diaphragm 21 to form a thermal sensing chamber (diaphragm chamber) 25. (22) and the lid member 22 in cooperation with the outer circumferential portion (the outer circumferential edge and the cylindrical portion) of the diaphragm 21 to seal and the valve body 15 to slide freely to its inner circumference. And a cylindrical lid housing member 23 having a flanged flange portion 23a, and the lid member 22, the flange receiver portion 23a of the lid housing member 23 (at the diaphragm 21). The lower end portion of the fitting portion (fitting portion) is joined (welding portion Ka) by the entire circumferential welding, and a thin thickness small diameter portion 23c constituting the valve chamber 14 is provided below the lid housing member 23. Is provided, and the insertion hole which becomes the inlet passage part 11a is provided in this thin thickness small diameter part 23c. There are (23e) is formed.

On the upper end of the valve rod 15A of the valve body 15, a large diameter portion 15a is fitted to freely lift and lift the recess 23d provided in the upper center of the lid housing member 23 in an excited state. In the center of the upper surface of the large diameter portion 15a, as shown in Fig. 3, a trapezoidal ring-shaped projection 16 in cross section is formed, and ring-shaped grooves 16a and 16b are formed in the inner and outer circumferences thereof. The diaphragm 21 is joined to the annular protrusion 16 by projection welding to the valve body 15 coaxially (common axis Ox) by welding (welding portion Kb).

In addition, a male screw portion 23b screwed to the female screw portion 10b, which is provided for attachment to the valve body 10A, is provided on the outer circumference of the cylindrical portion of the lid housing member 23, and as described above. Unit consisting of a thermostatic pressure response element 20 (diaphragm 21, lid member 22, lid housing member 23) and valve body 15, which are integrally coupled to each other, is provided with a dustproof spring 18 to be described later. In the state attached to the lower end of the valve rod 15A, the male screw portion 23b is screwed onto the female screw portion 10b of the valve body 10A, twisted by rotating the whole, and attached to the valve body 10A. do. At this time, a gasket 26 is interposed between the bottom surface of the lid housing member 23 and the top surface of the valve body 10A.

자형으로 전체가 원환모양(복수, 이 실시예에서는 8개의 외주톱니(18a)가 동일한 각도 간격으로 형성되어 있다) 바닥부(18A)와, 상기 바닥부(18A)의 내주로부터 돌출하여서 밸브 본체(15)의 밸브봉(15A) 하단부 부근의 외주면에 탄발적으로 압접하는, 복수(여기서는 4개)의 동일한 각도 간격(전후 좌우 대칭)으로 형성된 혀 모양 요곡편부(18B)로 구성되어 있다. 이때, 혀 모양 요곡편부(18B)의 선단부는, 밸브봉(15A)에의 장착의 편의를 도모하기 위해 외주측으로 꾸부려져 있다. 또한, 도 4a, 도 4b에 도시되는 방진 용수철(18)은, 바닥부(18A)의 내주측과 외주측이 처음부터 밸브 본체(10A)에 접촉하도록 되어 있지만, 그 대신에, 도 4c에 나타낸 것처럼, 처음에는 바닥부(18A)의 외주측만이 접촉하고, 내주측은 뜨게 되는 형상의 방진 용수철(18)이어도 된다.On the other hand, the vibration-proof spring 18 for suppressing the vibration of the valve main body 15 is arrange | positioned at the bottom of the valve chamber 14 of the valve main body 10A. As shown in Figs. 4A and 4B, the anti-vibration spring 18 is made of an elastic plate material, and its thin thickness small diameter portion 23c when the lid housing member 23 is screwed into the valve body 10A and mounted. Section which is pressed flat to the valve body 10A and becomes flat

The entire body has an annular shape (plural, in this embodiment, the eight outer teeth 18a are formed at equal angular intervals) and the valve body (protruding from the inner circumference of the bottom portion 18A) and the bottom portion 18A. It consists of the tongue-shaped concave piece part 18B formed in the same angle space | interval (front-side left and right symmetry) of plurality (here four) which elastically press-contacts to the outer peripheral surface near 15A of lower end parts of 15 A of valve rods. At this time, the front end of the tongue-shaped curved piece 18B is decorated on the outer circumferential side for the convenience of mounting on the valve rod 15A. In addition, although the inner peripheral side and outer peripheral side of 18 A of bottom parts contact the valve main body 10A from the beginning, the antivibration spring 18 shown to FIG. 4A and FIG. 4B is shown in FIG. 4C instead. As such, at first, only the outer peripheral side of the bottom portion 18A may be in contact with each other, and the inner peripheral side may be a dust-proof spring 18 having a floating shape.

In addition, in the present embodiment, in order to sense the temperature of the refrigerant at the outlet side of the gas cooler 102, the thermostat 30, as shown in FIG. 2, the gas cooler 102 and the internal heat exchanger 103. Contact with the start end of the conduit (near the outlet 102b of the gas cooler 102) to form a flow path (122) for connecting the pipe is installed and fixed by a suitable fastener, the capillary tube ( The thermosensitive chamber 25 is in communication with each other via 32. One end and the other end of the capillary tube 32 are hermetically fixed to the thermosensitive chamber 30 and the thermosensitive chamber 25, respectively. In the thermostat chamber 30 and the thermostat chamber 25, the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler 102 from the short capillary tube 34 fixed to the other end of the thermostat chamber 30. When the refrigerant pressure at the outlet side of the gas cooler 102 is set at a pressure (for example, when the refrigerant temperature at the outlet side is 40 ° C., the refrigerant pressure at the outlet side is, for example, 10 MPa, In order to control the refrigerant pressure at the outlet side to be 10 MPa), CO ₂ is sealed at a predetermined density, and an inert gas such as nitrogen gas is filled and sealed. In this state, the end of the capillary tube 34 is closed. It is sealed.

In such a configuration, the thermostat 30 detects the change in the refrigerant temperature (change) at the outlet side of the gas cooler 102, and the sensed temperature (change) is sensed through the capillary tube 32. Is transmitted to, and the internal pressure (change) of the temperature-sensitive chamber 25 depends on the refrigerant temperature (change) of the outlet side of the gas cooler 102, and the diaphragm 21 The valve cooler 102 is driven so that the valve main body 15 is driven in the opening and closing direction, whereby the valve opening degree is adjusted so that the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler 102. The refrigerant pressure at the outlet side of the regulator is regulated.

Thus, in the pressure control valve 1A of this embodiment, in order to detect the temperature of the refrigerant | coolant on the outlet side of the gas cooler 102 like the conventional one, without installing the refrigerant | coolant in the valve main body 10A, it installed separately. The thermostat tube 30 detects the temperature of the refrigerant on the outlet side of the gas cooler 102, and furthermore the valve body 10A from the outside without embedding the thermostatic pressure response element 20 in the valve body 10A. The gas cooler 102 is mounted in a manner such as twisting on the gas cooler, and the temperature reduction chamber 30 and the temperature reduction chamber 25 are provided such that the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler 102. In order to regulate the refrigerant pressure on the outlet side, CO ₂ is sealed at a predetermined density, and an inert gas is filled and sealed, so that the valve opening degree is adjusted only by the thermostatic pressure response element 20 without using a spring member or the like. Be Therefore, without providing a temperature reduction inlet, an outlet, or a spring member, as a result, the refrigerant pressure at the outlet side of the gas cooler 102 can be appropriately adjusted according to the refrigerant temperature at the outlet side, Simplification, reduction of the number of parts, reduction of processing assembly cost, and the like can be effectively achieved.

5 is a longitudinal sectional view of a second embodiment of a pressure control valve according to the present invention. The pressure control valve 1B of the second embodiment shown is basically the same configuration as the pressure control valve 1A of the first embodiment (parts or the same corresponding to the respective parts of the pressure control valve 1A of the first embodiment). The same reference numerals are attached to the functional parts, and their overlapping description is omitted). In the pressure control valve 1B of the present embodiment, the valve body 10B is disposed in the valve mounting portion 130 of the heat exchanger 103, The control valve 1B can be easily attached to, for example, the internal heat exchanger 103 or the gas cooler 102 and the like, and the valve body 10B does not need to connect a conduit to form a flow path. .

That is, the valve body 10B is formed in a cylindrical shape having a bottom end, and on the outer circumference thereof, for example, to be screwed to the female threaded portion 135 of the valve mounting portion 130 that is pre-installed in the internal heat exchanger 103. A male screw 19 is formed, and a pair of left and right pressure adjusting inlets 11 and 11 are installed obliquely downward on the lower periphery of the valve body 10B, and at the center of the bottom of the valve body 10B. A pressure regulator outlet 12 is provided. Moreover, the ring 41 for sealing between the valve mounting part 130 is attached to the upper part of the valve main body 10B, and the pressure inflow ports 11 and 11 for the outer peripheral side of the bottom bottom of the valve main body 10B. ) And a circular triangular or trapezoidal annular projection 42 for protruding from the refrigerant flows between the outlet and the pressure adjustment outlet 12.

The pressure control valve 1B of the above configuration is screwed by screwing the male screw portion 19 to the female screw portion 135 of the valve mounting portion 130 and twisting the whole by rotating the whole. As a result, the pressure control valve 1B is attached to the valve mounting portion 130. At this time, the annular projection 42 provided on the bottom surface of the valve body 10B is pressed against the bottom surface of the valve mounting portion 130, whereby the pressure adjusting inlets 11 and 11 and the pressure adjusting outlet ( 12) is blocked.

In this case, the coolant from the gas cooler 102 is the lower outer periphery of the valve body 10B from the inflow passage 136 provided below the valve mounting unit 130 via the internal heat exchanger 103. Flows into the valve chamber 14 through the gap formed between the outer circumferential side (42) and the inner circumferential surface of the valve mounting unit 130, and is introduced into the valve chamber 14, 14, it flows out into the pressure-regulating outlet 12 according to the valve opening degree, and depressurizes it, and it is sent to the evaporator 104 via the discharge | emission path part 137 provided in the lower part of the valve mounting part 130.

6 is a longitudinal sectional view of a third embodiment of a pressure control valve according to the present invention. The pressure control valve 1C of the third embodiment shown in the drawings is basically the same as the pressure control valve 1A of the first embodiment (the same reference numerals are used for the parts corresponding to the respective parts of the pressure control valve 1A of the first embodiment or the same functional parts). And omit their duplicate descriptions).

The first embodiment shown in FIG. 1 is an example of the valve main body 10A having the pipes from the internal heat exchanger 103 and the pipes leading to the evaporator 104 in the horizontal direction, but in the third embodiment shown in FIG. The pipe main body 10C which makes the piping led to the evaporator 104 perpendicular to the piping from the internal heat exchanger 103 is used. For this reason, by replacing and assembling the valve body 10A of the first embodiment and the valve body 10C of the third embodiment, it is possible to provide a pressure control valve that can cope with any one of the horizontal pipes or the vertical pipes. Do. In the pressure control valve 1C of the present embodiment, the lid accommodating member 23 includes a cylindrical portion 23A having a stage having a male screw portion 23b formed therein, and a plate-shaped annular flange-shaped cross section having a cross-section. It is divided into 23B), and the valve rod 15A is divided into the shaft part 15A 'and the large diameter part 15A of cross-sectional T-shape. When divided, only the large diameter portion 15A is made of an SUS 304 member, and the shaft portion 15A 'can use SUS303 made of a quick material, and there is a cost advantage in processing.

The cylindrical portion 23A of the lid housing member 23, which has a stage on which the male screw portion 23b is formed, is manufactured by cutting because it is difficult to manufacture in press working, and the annular flange-shaped portion 23B is manufactured. It is produced by press processing which is relatively inexpensive. In this case, after press-fitting the upper large diameter part 23g of the cylindrical part 23A which has an end into the inner peripheral part which has the end of the annular flange-shaped part 23B, the valve integrated with the diaphragm 21 by projection welding. The rod 15A (integrated with the valve shaft and the large diameter part by press-fitting) and the lid member 22 are bonded together, and the lid housing member 23, the diaphragm 21 and the lid member 22 are integrally formed in three positions. The whole circumference part Ka is joined by welding and integrated. Mounting of the temperature-sensitive pressure acting element 20 to the valve body 10C is performed while fitting the annular flange portion 23B to the annular convex portion 10f protruding from the upper surface of the valve body 10C. 23b is screwed to the female screw part 10b of the said valve main body 10C, the whole is rotated, a screw is screwed, and it is attached to the valve main body 10C. At this time, a gasket 46 is interposed between the upper surface of the annular convex portion 10f of the valve body 10C and the concave portion of the annular flange-shaped portion 23B. Thus, the part cost can be kept low by dividing the lid housing member 23 into two members, and producing one by press processing in which production cost is comparatively acidic.

In addition, the upper end of the shaft portion 15A 'of the valve rod 15A is integrally fixed to the short axis portion of the large diameter portion 15A having a cross-sectional T-shape by press fitting or the like. Thus, by dividing the valve rod 15A into the shaft portion 15A 'and the large diameter portion 15A, the production of the annular projection 16 provided for the joining by the projection welding with the diaphragm 21 is easy. Become.

7 and 8 are a plan view and a right side view showing a fourth embodiment of the pressure control valve according to the present invention. The pressure control valve 1D of the fourth embodiment shown in the drawings has the same configuration except that the pressure control valve 1A of the first embodiment shown in FIG. 1 does not include the thermostat 30. Therefore, the internal configuration and the like refer to the first embodiment.

As shown in FIG. 9, the pressure control valve 1D of this embodiment is arranged in the gas cooler 102 in the vapor compression refrigeration cycle 100B which is basically the same as that shown in FIG. Similarly, the refrigerant introduced from the gas cooler 102 via the internal heat exchanger 103 is regulated according to the refrigerant temperature on the outlet side of the gas cooler 102 to be led to the evaporator 104.

More specifically, the pressure control valve 1D (the temperature reduction chamber 25 itself) itself has an example as shown in FIG. 9 in order to directly detect the refrigerant temperature at the outlet side of the gas cooler 102. For example, piping and installation are provided in front of the gas cooler 102.

In addition, in the temperature reduction chamber 25 of the temperature-sensitive pressure acting element 20, the maximum grade coefficient is obtained from the short capillary tube 39 fixed to the temperature reduction chamber 25 with respect to the refrigerant temperature at the outlet side of the gas cooler 102. When the refrigerant pressure at the outlet side of the gas cooler 102 is set at a pressure (for example, when the refrigerant temperature at the outlet side is 40 ° C., the refrigerant pressure at the outlet side is, for example, 10 MPa, In order to control the refrigerant pressure at the outlet side to be 10 MPa, CO ₂ is sealed at a predetermined density, and an inert gas such as nitrogen gas is filled and sealed. In this state, the end of the capillary tube 39 is sealed. It is.

In such a configuration, the temperature of the refrigerant on the outlet side of the gas cooler 102 is sensed by the temperature reduction chamber 25 so that the internal pressure of the temperature reduction chamber 25 depends on the refrigerant temperature on the outlet side of the gas cooler 102. The diaphragm 21 responds to the change in the internal pressure of the temperature reduction chamber 25 to drive the valve main body 15 in the opening and closing direction, whereby the valve opening degree is adjusted and the refrigerant on the outlet side of the gas cooler 102. The refrigerant pressure on the outlet side of the gas cooler 102 is regulated so as to obtain a maximum performance coefficient with respect to temperature.

Thus, in the pressure control valve 1D of this embodiment, in order to detect the temperature of the refrigerant | coolant on the outlet side of the gas cooler 102 like conventionally, it does not introduce the refrigerant | coolant into the valve main body 10D, and pressure control is carried out. By arranging the valve 1D itself in front of the gas cooler 102, the temperature of the refrigerant on the outlet side of the gas cooler 102 is sensed, and as in the first embodiment, the temperature-sensitive pressure acting element 20 is In addition to mounting in the valve body 10D from the outside without being embedded in the valve body 10D, the temperature reduction chamber 25 has a maximum performance with respect to the refrigerant temperature at the outlet side of the gas cooler 102. In order to regulate the refrigerant pressure at the outlet side of the gas cooler 102 so that the coefficient is obtained, CO ₂ is sealed at a predetermined density, and an inert gas is filled and sealed, and a temperature-sensitive pressure reaction is performed without using a spring member or the like. Eliman Since the valve opening degree is adjusted only by 20, no temperature inlet, outlet, or spring member is provided, and as a result, the refrigerant pressure at the outlet side of the gas cooler 102 is appropriately adjusted according to the refrigerant temperature at the outlet side. In addition, the pressure can be adjusted easily, and the structure can be simplified, the number of parts can be reduced, and the work assembly cost can be effectively reduced.

At this time, in the pressure control valves 1A, 1C, and 1D of the first embodiment, the third embodiment, and the fourth embodiment, the valve bodies 10A, 10C, and 10D are cut out from an aluminum extruded rod having a rectangular cross section. It is provided for mounting to the piping member or internal heat exchanger 103 of the refrigerant | coolant outlet 11, 12, the mounting part (female threaded part 10b) of the element 20, the control valves 1A, 1C, and 1D to an outline rectangular parallelepiped object. The female screw parts 51 and 52, the valve seat part 13, etc. are formed. As a result, further simplification of the configuration, reduction of the number of parts, reduction of processing assembly cost, and the like can be achieved.

In addition, in order to improve the temperature sensing property of the thermosensitive chamber 25, as shown in FIG. 10A and FIG. 10B, the thermosensitive fins 55 and 55 are provided in the outer periphery of the thermosensitive chamber 25, or the thermosensitive fin What is necessary is just to coat the cylindrical body 56 or lid-shaped body which has 56a, 56a to the outer periphery of the temperature-sensitive chamber 25.

11, 12, and 13 are longitudinal sectional views, top views, and left side views respectively showing a fifth embodiment of the pressure control valve according to the present invention. The pressure control valve 1E of the fifth embodiment shown in the drawing is inserted into a vapor compression refrigeration cycle 100C which is basically the same as that shown in FIG. 21 described above, as shown in FIG. 14, and the gas cooler 102. The refrigerant introduced through the internal heat exchanger (103) is regulated in accordance with the refrigerant temperature at the outlet side of the gas cooler (102) to lead to the evaporator (104). At this time, in the refrigerating cycle 100C shown in FIG. 14, the same components or the same functional parts as those of the respective parts of the refrigerating cycle 100 shown in FIG.

The pressure control valve 1E is provided for efficiently operating the refrigerating cycle 100C, in other words, the gas cooler 102 so that the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler 102. Valve body 15, which is provided for regulating the refrigerant pressure at the outlet side of the valve), comprising a valve body 10A, a valve rod 15A, and a conical valve body portion 15B provided at the lower end thereof, And a thermostatic pressure actuating element 20.

The valve body 10E is formed by cutting, etc., on the mud material cut out from the aluminum cross-section bar (see FIG. 13) of the cross-section cross shape (refer to FIG. 13), and the refrigerant from the gas cooler 102 is internally below. A pressure adjustment inlet (joint part) 11 opened to the right side including an inlet passage part 11a for introduction through the heat exchanger 103, and a valve chamber into which refrigerant from the pressure adjustment inlet 11 is introduced. (14) from the valve chamber 14 and the valve seat part 13 of the conical surface which form the bottom of this valve chamber 14, and the said valve body 15 (valve body part 15B of the valve body) is folded. A pressure control outlet (joint part) 12 opened to the left side including an outlet passage part 12a for guiding the refrigerant to the evaporator 104 is formed. At this time, a small bleed notch (not shown) is formed in the valve seat portion 13, and the valve opening degree of the main valve 1E is the valve seat portion of the valve body 15 (valve body portion 15B). Corresponds to the lift amount from (13). By notch-molding the valve seat 13 with a press, processing of the outlet passage 12a becomes easy and at the same time, there is a self-cleaning effect when the control valve is used.

Moreover, the guide hole 18a which extends to the said valve chamber 14 in the center part of the valve main body 10E, and is inserted so that the valve rod 15A (middle large diameter part 15c of the valve main body 15) may slide freely. ) Is formed, and above the guide hole 18a, that is, the upper part of the valve body 10E, the temperature inlet 61 opened in the left side for introducing the refrigerant from the gas cooler 102, and And a thermal outlet (62) opened in the right side for guiding the refrigerant to the internal heat exchanger (103), and the thermal inlet chamber (11) between the thermal inlet (61) and the outlet (62). 60) is formed. Moreover, on the upper inner periphery of the valve main body 10E, the female screw part 10b for attaching the temperature-sensitive pressure acting element 20 mentioned later to the valve main body 10E is formed. At this time, the middle ring diameter portion 15c of the valve rod 15 is equipped with an O-ring 48 to block the flow of refrigerant between the valve chamber 14 and the temperature inflow chamber 60. have. In addition, the temperature-sensitive outlet 62 is eccentric with respect to the temperature-sensitive inlet 61.

The thermosensitive pressure actuating element 20 has a single cylindrical diaphragm 21 having a bottom surface, and a lid member having a cross-sectional inverse concave shape cooperating with the diaphragm 21 to form a thermal sensing chamber (diaphragm chamber) 25. (22) and the lid member 22 in cooperation with the outer peripheral portion (the outer peripheral edge and the cylindrical portion) of the diaphragm 21 is fitted and sealed, and the flange-shaped portion into which the valve body 15 is inserted in the inner circumference thereof. A cylindrical lid accommodating member 23 having a 23a is provided, and the fitting member (fitting portion 23a) of the lid member 22, the lid accommodating member 23, and the diaphragm 21 is fitted. The lower end part of the tomb part is joined (welding part Ka) by full perimeter welding.

The valve rod 15A of the valve body 15 is composed of a shaft portion 15a and a large diameter member 15b having a cross-sectional T-shape. The large diameter member 15b has a vertical edge portion (shaft portion) of the shaft portion ( It is vertically formed at the upper end of 15a) and is fixedly supported by press-fitting, welding, or the like, and at the same time, the upper edge part (disc part) is freely excited in the recess 23d provided in the upper center of the lid housing member 23. It is fitted to move up and down. In the center of the upper surface of this large diameter part 15b, as shown in FIG. 15, the cross-sectional trapezoidal ring-shaped protrusion 16 is formed, and the ring-shaped grooves 16a and 16b are formed in the inner and outer periphery. The diaphragm 21 is joined to the annular protrusion 16 by projection welding coaxially (common axis Ox) with the valve body 15 (welding portion Kb).

On the other hand, in the temperature reduction chamber 25 of the temperature-sensitive pressure acting element 20, the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler 102 from the short capillary tube 39 fixed to the temperature reduction chamber 25. When the refrigerant pressure at the outlet side of the gas cooler 102 is set at a pressure (for example, when the refrigerant temperature at the outlet side is 40 ° C., the refrigerant pressure at the outlet side is, for example, 10 MPa, In order to control the refrigerant pressure at the outlet side to be 10 MPa), CO ₂ is sealed at a predetermined density, and an inert gas such as nitrogen gas is filled and sealed, and in this form, the end of the capillary tube 39 This bag is enclosed.

In addition, a male screw portion 23b screwed to the female screw portion 10b, which is provided for attachment to the valve body 10E, is provided on the outer circumference of the cylindrical portion of the lid housing member 23, and as described above. Unit consisting of a thermosensitive pressure actuating element 20 (diaphragm 21, lid member 22, lid housing member 23) and valve body 15 integrally coupled to each other, the male screw portion 23b is It is screwed into the female screw part 10b of the valve main body 10E, twisted by rotating the whole, and attached to the valve main body 10E. In this way, in the state attached to the valve main body 10E, the temperature reduction inflow chamber 60 is formed between the lid accommodating member 23 and the upper part of the valve rod 15, and the inside of this temperature reduction inflow chamber 60 The temperature of the coolant is sensed by the temperature reduction chamber 25.

At this time, a gasket 26 is interposed between the lower surface of the lid housing member 23 and the upper surface of the valve body 10E. In addition, on the left and right side surfaces of the valve body 10E, a screw hole 51 for attaching the control valve 1E to a pipe joint for joint with the gas cooler 102 and the evaporator 104 or an internal heat exchanger 103 or the like is provided. 52 and round holes 53 and 54 are formed.

In such a configuration, when the refrigerant at the outlet side of the gas cooler 102 is introduced into the temperature reduction inlet chamber 60 from the temperature reduction inlet 61, the refrigerant temperature at the outlet side of the gas cooler 102 is introduced by the temperature reduction chamber 25. Is sensed, and the internal pressure of the temperature reduction chamber 25 becomes the internal pressure according to the refrigerant temperature of the outlet side of the gas cooler 102, and the diaphragm 21 responds to the change in the internal pressure of the temperature reduction chamber 25 so that the valve body ( 15) in the opening and closing direction, whereby the valve opening degree is adjusted so that the refrigerant pressure at the outlet side of the gas cooler 102 is obtained so that the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler 102. This is regulated.

Thus, in the pressure control valve 1E of this embodiment, since the valve opening degree is adjusted only by the temperature-sensitive pressure actuating element 20, the valve opening degree (the lift amount of the valve main body) is the temperature reduction chamber 25 like conventionally. Compared with the equilibrium relationship between the open and close valve force due to internal and external pressure and the closed valve force due to the spring member, the configuration is simplified, the number of parts is reduced, and the thermostatic pressure response element is incorporated in the valve body. Also, it is possible to effectively simplify the configuration, reduce the number of parts, and reduce the processing and assembly cost, from the mounting by the method such as twisting the valve body from the outside without making it.

16 and 17 are longitudinal sectional views and plan views of a sixth embodiment of a pressure control valve according to the present invention. The pressure control valve 1F of the sixth embodiment shown in the drawing is basically the same configuration as the pressure control valve 1E of the fifth embodiment (the same reference numerals are used for the parts corresponding to the respective parts of the pressure control valve 1E of the fifth embodiment or the same functional parts). In the pressure control valve 1F of the present embodiment, the control valve 1F can be easily attached to, for example, the internal heat exchanger 103 or the gas cooler 102 and the like. In the valve body 10F, there is no need to connect a conduit flow forming a flow path. That is, the valve main body 10F is formed in a cylindrical shape with a stage having a bottom surface, and on its outer circumference, for example, the female screw portion 135 of the valve mounting portion 130 that is previously installed in the internal heat exchanger 103. A male screw portion 19 for screwing is formed, and a flange portion 70 of a regular hexagon in plan view is provided at the upper end of the valve body 10B. O-rings 71 and 72 are attached to the top and bottom of the pressure adjusting inlet 11 and the outlet 12 at the lower portion of the valve body 10F.

The pressure control valve 1F having the above-described configuration is screwed into the female threaded portion 135 of the valve mounting portion 130 by rotating the male screw portion 19 to twist the entire flange portion 70. Accordingly, the pressure control valve 1F is mounted to the valve mounting portion 130.

In this case, the refrigerant | coolant for pressure regulation from the gas cooler 102 is the pressure_regulation inlet_port | entrance of the valve main body 10F from the introduction passage part 136 provided in the lower part of the valve mounting part 130 via the internal heat exchanger 103. 11 is introduced into the valve chamber 14 and flows out from the valve chamber 14 to the pressure adjusting outlet 12 according to the opening degree of the valve to reduce the pressure, and is provided under the valve mounting unit 130. It is sent to the evaporator 104 via the passage part 137.

In addition, the refrigerant from the gas cooler 102 flows into the thermal inlet 61 of the valve body 10 from the inlet passage 141 provided above the valve mounting unit 130, and at the same time, the temperature introduction chamber. The temperature is sensed by the temperature-sensing chamber 25 and introduced into the 60, and the internal heat exchanger 103 is introduced from the temperature-sensing outlet 62 through the discharge passage portion 142 provided on the upper portion of the valve mounting unit 130. It is sent out.

18 is a longitudinal sectional view of the seventh embodiment of a pressure control valve according to the present invention. The pressure control valve 1G of the seventh embodiment shown in the drawing is basically the same configuration as the pressure control valve 1E of the fifth embodiment (the same reference numerals are used for parts corresponding to the respective parts of the pressure control valve 1E of the fifth embodiment or the same functional parts). In the pressure control valve 1G of the present embodiment, the large diameter portion 15b is integrally provided at the upper end of the shaft portion 15a of the valve rod 15A, and the vertical opening of the upper surface of the valve is provided. The furnace plate hole 19 is provided, and the perforation 21a which communicates the temperature sensitive chamber 25 and the said plate | board hole 19 in the center part of the said diaphragm 21 is formed, and is vertical with the temperature sensitive chamber 25 The furnace plate hole 19 is configured with one expansion thermal chamber.

In this way, the temperature sensing capability can be improved by extending the temperature-sensitive chamber toward the temperature-sensitive introduction chamber 60. 19 and 20 are longitudinal sectional and left side views of an eighth embodiment of a pressure control valve according to the present invention. The pressure control valve 1H of the eighth embodiment shown in the drawing is basically the same configuration as the pressure control valve 1E of the fifth embodiment (the same reference numerals are used for the parts corresponding to the respective parts of the pressure control valve 1E of the fifth embodiment or the same functional parts). In the pressure control valve 1H of the present embodiment, a plurality of annular grooves 15b are formed in the shaft portion 15a of the valve rod 15A, and the shaft portion 15a is In order to be easy to receive heat from the refrigerant in the temperature introduction chamber 60, that is, the temperature reduction effect of the shaft portion 15a is enhanced. In addition, the valve body 10H has a groove 64 for blocking heat transfer between the temperature reduction inlet 61 and the outlet 62, and the pressure adjusting inlet 11 and the outlet 12. Forming.

In the pressure control valve according to the present invention, in order to sense the temperature of the refrigerant on the outlet side of the gas cooler, the refrigerant is not introduced into the valve body, but is provided by a thermostat installed separately, or the pressure control valve. By arranging itself in the gas cooler (or near its outlet), the temperature of the refrigerant at the outlet side of the gas cooler can be sensed, and the method of twisting the valve body from the outside without embedding the thermostatic pressure response element in the valve body, etc. In addition, in the thermostat and the thermostat chamber, CO ₂ is controlled at a predetermined density so as to adjust the refrigerant pressure at the outlet side of the gas cooler so that a maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler. At the same time, the inert gas is filled and sealed, and the valve is opened only by using a thermostatic pressure response element without using a spring member or the like. The degree of adjustment can be adjusted, so that the temperature inlet, the outlet or the spring member and the like are not made. As a result, the refrigerant pressure at the outlet side of the gas cooler can be appropriately adjusted according to the refrigerant temperature at the outlet side. Simplification, reduction of the number of parts, reduction of processing assembly cost, and the like can be effectively achieved.

In addition, since the pressure control valve according to the present invention is adapted to adjust the valve opening degree only by the temperature-sensitive pressure actuating element, the valve opening degree (lift amount of the valve body) is opened by the differential pressure inside and outside the temperature reduction chamber as in the related art. Compared to the determination of the equilibrium relation between the valve force and the closing valve force by the spring member, the configuration is simplified, the number of parts is reduced, and the thermostatic pressure response element is twisted from the outside to the valve body without being incorporated into the valve body. The gourd is attached by the method of the same.

Claims (26)

A compressor for circulating CO ₂ as a refrigerant, a gas cooler for cooling the refrigerant compressed by the compressor, an evaporator into which the refrigerant from the gas cooler is introduced, a refrigerant on the outlet side of the evaporator and an outlet of the gas cooler The refrigerant which is inserted into a vapor compression refrigeration cycle having an internal heat exchanger for performing heat exchange with the refrigerant on the side, and is introduced into the vapor compression type refrigeration cycle from the gas cooler via the internal heat exchanger is regulated in accordance with the refrigerant temperature on the outlet side of the gas cooler. As a pressure control valve leading to A temperature sensing chamber for sensing a refrigerant temperature at an outlet side of the gas cooler and a temperature sensing chamber for communicating with the temperature sensing chamber through a capillary tube, and a temperature sensing chamber for driving the valve body in the opening and closing direction in response to a change in the internal pressure of the temperature sensing chamber. A pressure response element and a valve body to which the element is integrally mounted; and in the thermostat chamber and the thermostat chamber, the outlet side of the gas cooler so as to obtain a maximum grade coefficient with respect to the refrigerant temperature on the outlet side of the gas cooler. The pressure control valve is characterized in that the CO ₂ is sealed at a predetermined density and filled with an inert gas to fill the refrigerant pressure. A compressor for circulating CO ₂ as a refrigerant, a gas cooler for cooling the refrigerant compressed by the compressor, an evaporator into which the refrigerant from the gas cooler is introduced, a refrigerant on the outlet side of the evaporator and the gas cooler. The gas cooler in the vapor compression type refrigeration cycle having a heat exchanger that performs heat exchange with the refrigerant on the outlet side, or a refrigerant disposed near the outlet, and introduced into the gas cooler from the gas cooler via the internal heat exchanger, exits the gas cooler. A pressure control valve that is regulated in accordance with the refrigerant temperature on the side and is led to the evaporator, having a temperature sensing chamber for sensing the temperature of the refrigerant on the outlet side of the gas cooler, and responding to a change in the internal pressure of the temperature sensing chamber to open and close the valve body. And a valve body to which the element is integrally mounted, Closed greenhouse, in order to pressure control the refrigerant pressure in the gas cooler outlet side of the outlet of the gas cooler, the maximum coefficient of performance that can be obtained with respect to the refrigerant temperature side, as soon CO ₂ is enclosed at a given density of the well, filled with an inert gas Pressure control valve, characterized in that the filled. The method according to claim 1 or 2, The valve body is a pressure control valve, characterized in that the coolant inlet, outlet, the mounting portion of the element, the valve seat portion in which the valve body is folded, and the like are formed in a substantially rectangular parallelepiped cut out from the push rod having a rectangular cross section. The method according to any one of claims 1 to 3, A pressure control valve, characterized in that at least one of a male threaded portion, a flange portion, and a female threaded portion or an insertion hole for bolts provided for mounting to a pipe joint or an internal heat exchanger is provided. The method according to any one of claims 1 to 4, The thermosensitive pressure actuating element seals a diaphragm, a lid member having a cross-sectional inverse concave shape which cooperates with the diaphragm to form the thermal sensing chamber, and seals an outer peripheral portion of the diaphragm in cooperation with the lid member. It is provided with a cylindrical lid housing member having a flange-shaped portion that is fitted so as to slide freely on the inner circumference thereof, and that a male screw portion provided for mounting to the valve body is provided on the outer circumference of the cylindrical portion of the lid housing member. Pressure control valve characterized in that. The method according to any one of claims 1 to 5, The pressure control valve, characterized in that the vibration damping spring for suppressing the vibration of the valve body is disposed in the valve body. The method of claim 6, The anti-vibration spring is made of an elastic plate, and is cross-sectional pressed tightly to the valve body by the lid accommodating member.

A pressure control valve comprising a ring-shaped bottom portion and a plurality of tongue-shaped curved piece portions protruding from an inner circumference of the bottom portion and elastically contacting an outer circumferential surface of the valve body. The method according to any one of claims 5 to 7, The valve body and the diaphragm are arranged coaxially, and one end of the valve body and the diaphragm are joined by projection welding. The method according to any one of claims 5 to 8, The diaphragm is formed in a unitary cylindrical shape having a bottom surface, and the outer peripheral edge and the cylindrical portion of the diaphragm are sandwiched by the lid member and the lid housing member, and the bottom portion of the fitting portion is welded to the entire circumferential weld. Pressure control valve, characterized in that joined by. The method according to any one of claims 5 to 9, The lid accommodating member has a divided configuration consisting of a cylindrical portion and a flange-shaped portion provided with a male screw portion, and the flange-shaped portion is produced by pressing a sheet material. The method according to any one of claims 2 to 10, A thermostat pin is provided on the outer periphery of the thermostat chamber, or a tubular body or a cap body having a thermostat pin is deposited. The method according to claim 1 or 2, The valve body is divided into a shaft portion and a large diameter portion, the pressure control valve. The method according to claim 1 or 2, And a plurality of bleed notches are formed in the valve seat of the valve body. A compressor for circulating CO ₂ as a refrigerant, a gas cooler for cooling the refrigerant compressed by the compressor, an evaporator into which the refrigerant from the gas cooler is introduced, a refrigerant on the outlet side of the evaporator and an outlet of the gas cooler The refrigerant which is inserted into a vapor compression refrigeration cycle having an internal heat exchanger for performing heat exchange with the refrigerant on the side, and is introduced into the vapor compression type refrigeration cycle from the gas cooler via the internal heat exchanger is regulated according to the refrigerant temperature on the outlet side of the gas cooler to provide the evaporator. As a pressure control valve leading to A thermal inlet for introducing refrigerant from the gas cooler, a thermal outlet for leading the same to the internal heat exchanger, a thermal introduction chamber provided between the thermal inlet and the outlet, and a thermal introduction chamber. And a thermostatic pressure sensing element for sensing the temperature of the refrigerant, wherein the thermostatic pressure response element drives the valve body in the opening and closing direction in response to a change in the internal pressure of the thermostat chamber, and the valve body in which the element is integrally mounted. The temperature reduction chamber is filled with inert gas and filled with CO ₂ at a predetermined density in order to regulate the refrigerant pressure at the outlet side of the gas cooler so that the maximum grade coefficient is obtained with respect to the refrigerant temperature at the outlet side of the gas cooler. Pressure control valve, characterized in that the filled. The method of claim 14, The valve body may be formed of a temperature-sensitive inlet and outlet, the temperature-sensitive introduction chamber, the pressure adjusting inlet and outlet, the mounting portion of the element, and the valve body in a muk material cut out from a cross-section cross-shaped or rectangular extrusion bar. Pressure control valve, characterized in that the folding valve seat portion and the like is formed. The method of claim 15, A guide hole is formed above the valve seat in the valve body so that the valve body slides freely, and above the guide hole, the temperature inlet and outlet and the temperature introduction chamber are formed. The pressure control valve, characterized in that the pressure regulator inlet and outlet and the valve chamber is formed below the guide hole. The method according to any one of claims 14 to 16, And at least one of a male screw portion, a flange portion, and a female screw portion or an insertion hole for bolts, which are provided for attachment to a pipe joint for a gas cooler, an evaporator, or an internal heat exchanger. The method according to any one of claims 14 to 17, The thermosensitive pressure actuating element seals with a diaphragm, a lid member having a cross-sectional inverse concave shape that cooperates with the diaphragm to form the thermally sensitive chamber, and an outer peripheral portion of the diaphragm in cooperation with the lid member to seal the valve. The main body is provided with a cylindrical lid receiving member having a flange portion inserted into the inner circumference thereof, and a male screw portion provided for mounting to the valve main body is provided on the outer circumference of the cylindrical portion of the lid housing member. Control valve. The method of claim 18, The valve body and the diaphragm are arranged coaxially, and one end of the valve body and the diaphragm are joined by projection welding. The method of claim 8 or 19, The valve body includes a cylindrical valve rod and a valve body portion provided at a lower end of the valve rod, and the valve rod is composed of a shaft portion and a large diameter portion integrally installed or supported by an upper end portion of the shaft portion, and the upper surface of the large diameter portion. And the diaphragm is joined to the pressure control valve. The method according to any one of claims 18 to 20, The pressure control valve, characterized in that the temperature-sensitive introduction chamber between the valve rod of the valve body and the cylindrical portion of the lid housing member. The method according to any one of claims 18 to 21, The valve body is provided with a plate hole in the vertical opening of the upper surface opening, and a through hole is formed in the diaphragm so as to communicate the thermal chamber with the plate hole in the longitudinal direction. Pressure control valve, characterized in that the greenhouse is configured. The method according to any one of claims 18 to 22, The diaphragm is formed in a unitary cylindrical shape having a bottom surface, and the outer peripheral edge and the cylindrical portion of the diaphragm are inserted into the lid member and the lid accommodation member to be sealed, and the lower end portions of these fitting portions are joined by full circumferential welding. Pressure control valve, characterized in that. The method of claim 15, The valve body is a pressure control valve, characterized in that a groove for blocking heat transfer is formed between the temperature inlet and outlet and the pressure adjustment inlet and outlet. The method of claim 15, And a plurality of bleed notches are formed in the valve seat of the valve body. The method of claim 20, And a plurality of annular grooves are formed in the valve rod of the valve body.

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