JPH04102773A - Fluid control valve - Google Patents

Abstract

PURPOSE:To reduce the number of parts, and improve the assembling workability, and improve the reliability by forming a high pressure valve seat in one end of a main frame to form a high pressure valve part, and shrinking the other end of the main frame having a low pressure valve part to form a low pressure refrigerant inlet pipe. CONSTITUTION:A seat H36 in which a high pressure valve seat 39 is formed is provided in one end of a cylindrical main frame 34, and a leaf valve H40 for switching the valve seat 39, a spring 41 for energizing the leaf valve H40 to the high pressure valve seat 39, a guide 45, a presser spring 46 to be slid in the inner surface thereof, and a seat M42 in which end an O-ring as a valve seat is inserted and fixed by the main frame 34 and a roll caulking part 44, and the other end of the main frame 34 are shrinked to form an even pressure pipe 55. A valve is thereby made compact and light, and the number of parts is reduced, and since inner parts are fixed in the main frame 34 with processing of the roll caulking part 44, the assembling workability is improved remarkably. Heating process such as welding is eliminated to eliminate trouble such as thermal deformation or the like, and furthermore, a power element member for giving the influence to the operationability is eliminated to improve the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fluid control valve that is installed in a refrigeration system such as a refrigerator and opens and closes a refrigerant flow path.

BACKGROUND ART In recent years, rotary compressors have become mainstream as compressors for refrigeration systems such as refrigerators. However, in this refrigeration system, when the operation is stopped, the low pressure side in the rotary compressor becomes high pressure, and high pressure gas flows into the evaporator through the low pressure side channel, and also from the condenser on the high pressure side via the capillary. Since the heat flows into the evaporator, there is a problem in that when the operation is resumed, there is a large heat load on the evaporator, which inevitably increases power consumption.

Therefore, in order to prevent superheated gas from flowing into the evaporator from the high-pressure side and the low-pressure side, fluid control valves have been widely used that utilize fluid pressure within the system to achieve this purpose.

For example, there is an example described in Japanese Utility Model Publication No. 61-32210.

This conventional fluid control valve will be explained below.

FIG. 4 shows a refrigeration system using a conventional fluid control valve.

1 is a fluid control valve, 2 is a high-pressure container type electric compressor (hereinafter referred to as a compressor), 3 is a condenser, 4 is a capillary tube, and 5 is an evaporator.

The fluid control valve 1 includes a condenser 3 and a capillary tube 6.
It has a first valve device 6 interposed in a high pressure circuit A between the evaporator 5 and the compressor 2, and a second valve device 7 interposed in a low pressure circuit B between the evaporator 5 and the compressor 2.

The first and second valve devices 6.7 are formed in an upper casing 8 and a lower gauging 9, respectively, and the fluid control valve 1 is constructed by integrally combining both casings. That is, the first valve device 6 of the upper casing 8 and the second valve device A of the lower casing 9 are fixed to the upper casing 8 and divided into upper and lower parts by a large rose power element 10, The first valve device 6 includes a valve seat body 13 formed between a high-pressure refrigerant inlet vibrator 11 and a high-pressure refrigerant inlet vibrator 12, and a valve 14 that opens and closes the valve seat body 13.

The lower end of this valve 14 fits into the recess 15 of the power element 10, and the pressure difference between the high pressure circuit A and the low pressure circuit B that the power element MQ senses as well as the expansion and contraction force of the power element 10 itself are affected by the power element 10. The valve seat body 1 is
3 opens and closes. Further, the second valve device 7 includes a valve seat body 2 formed on a connecting member 19 having a low-pressure refrigerant inlet vibe 18 fixed to one open end 17 of the lower casing 9.
0 and a leaf valve 21 that opens and closes the valve seat body 20 by fluid pressure.

Note that the low-pressure refrigerant outlet vibe 22 constituting the low-pressure circuit B is provided in the upper casing 8.

On the other hand, 23 is a cylindrical adjustment member screwed into a threaded portion 24 inside the lower open end of the upper casing 8 .

25 is an O-ring, which connects the upper casing 8 and the lower casing 9 to the lower casing 9. The open end 27 is caulked to form an airtight seal.

A brief explanation of the operation of the fluid control valve 1 is as follows.
When compressor 2 is operating, high pressure circuit A is naturally at high pressure.
Since low voltage circuit B becomes low voltage, power element 1
sensing this pressure difference, the valve 14 overcomes the biasing force of the spring 16 and opens the valve seat body 13, and the leaf valve 21 is also lifted by the refrigerant pressure from the low-pressure refrigerant inlet vibe 18, and the adjustment member 23 is lifted. It comes into contact with the stopper surface 28. Therefore, the refrigerant flows from the compressor 2 to the condenser 3 to the first valve device 6 to the capillary tube 4 to the evaporator 6 to the second valve device 7 to the compressor 2 to perform a normal refrigeration action. When the compressor 2 stops, high-pressure gas flows back to the low-pressure side of the compressor 2 and flows into the fluid control valve 1 from the refrigerant outlet vibe 22, but the leaf valve 21 closes the valve seat body 2o due to this reverse pressure. power element 1
o senses the pressure difference between high pressure circuit A and low pressure circuit B at this time,
The valve 14 is pushed up by the biasing force of the spring 16, and the valve seat body 13 is closed. Tsume υ high voltage circuit A.

Both low voltage circuit B and 1. closed with a second valve device 6.7;
This prevents superheated gas from flowing into the evaporator 5.

Problems to be Solved by the Invention However, the conventional configuration described above has a large number of parts and a complicated structure, making the assembly process complicated.

Further, since the operation is regulated by the power element 10, there is a drawback that if the power element 1o is deformed or destroyed due to abnormal pressure, the refrigeration system will not be cooled at all. Furthermore, since the power element 1o, the upper casing 8, the lower casing 9, and the connecting member 19 are joined by soldering or brazing, the quality is unstable, such as thermal deformation of the four internal components due to heating. There was a problem.

The present invention solves the above-mentioned conventional problems, and aims to provide a highly reliable fluid control valve that simplifies the structure, improves assembly workability, and reduces costs.

Means for Solving the Problems In order to achieve the above objects, the fluid control valve of the present invention has a cylindrical main body formed with a high pressure valve seat at one end, and a seat H provided with high pressure refrigerant inlet and outlet pipes, The sheet H in the main body
Leaf valve H that opens and closes the high-pressure valve seat using refrigerant pressure.
, a spring that urges the leaf valve H toward the high pressure valve seat and its guide, an Osae spring that is installed between the leaf valve H and the spring and slides on the inner surface of the guide, and an O-ring at the end. The seat M has a through hole in the center thereof, and the seat M is fixed by the main body and the roll crimping part to constitute a high pressure valve part, and is positioned and inserted by the inner peripheral convex part of the main body, and is fixed by the main body and the roll crimping part. The main body has a low-pressure valve portion, and the other end of the main body is configured to form a low-pressure refrigerant entry pipe by contracting the pipe.

Function The present invention can reduce the number of parts with the above-described configuration, and since the internal parts can be sequentially assembled into the cylindrical main body and each of the threads can be fixed by roll caulking, the assembling workability is greatly improved.

Furthermore, heating such as welding of internal parts is not necessary, and problems such as thermal deformation are also eliminated, and reliability can be improved.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. Since the refrigeration system has the same configuration as the conventional one, the same reference numerals will be used and detailed explanation thereof will be omitted.

FIG. 1 is a sectional view of a fluid control valve according to a first embodiment of the present invention, showing a state in which the refrigeration system is stopped. Moreover, FIG. 2 shows the same operating state.

31 is a single flow control valve that connects the condenser 3 and capillary tube 4.
A high-pressure valve part 32 interposed in a high-pressure circuit A between the evaporator 6 and
A low pressure section 3 interposed in a low pressure circuit B between the compressor 2 and the compressor 2
It is integrally formed with a cylindrical main body 34 having a diameter of 3'jt and forming an outer shell. Reference numeral 36 denotes a low-pressure refrigerant outlet pipe joined to the side surface of the main body, which is connected to the suction side of the compressor 2 and forms a refrigerant flow path. First, the configuration of the high pressure valve section 32 will be explained. Reference numeral 36 denotes a sheet H joined to one end of the main body 34, to which a high pressure refrigerant inlet pipe 37 and a high pressure refrigerant outlet pipe 38 are joined, and to the other end a high pressure valve seat 3.
9 is formed. Reference numeral 4o designates a leaf valve H that is biased by a spring 41 and contacts the high-pressure valve seat 39 of the seat H36, and opens and closes the high-pressure valve seat 39 using high-pressure refrigerant. 4
2 is a seat M in which an O-ring 43 forming a valve seat is inserted at the end and has a refrigerant through hole 42a in the center, and serves as a stopper and a valve seat when the leaf valve H40 is operated. , is fixed by the main body 34, the roll crimping part 44, and the roll crimping part 4. 46 is a guide for the leaf valve H40, which has one end in contact with the seat H36 and the other end in contact with the seat M42.
0 movement stroke and positioning of the roll caulking portion 44 of the sheet M. 46 is the leaf valve H
40 and the spring 41, and its side surface is engaged so as to slide on the inner surface of the guide 4o.

Next, the configuration of the low pressure valve section 33 will be explained. 47 is the main body 3
This is a stopper that is positioned and inserted by the inner peripheral convex portion 48 of No. 4. 49 has a hole 49a in the center and an outer peripheral notch 49.
b is a seat L that is positioned by engaging one end of the stopper 47, and is fixed to the main body 34 by the roll caulking portion 5o to form a low pressure valve seat 49c. 61 is in contact with the low pressure valve seat 49a of the seat L49 and is actuated by the refrigerant flow, and moves to the claw portion 4a of the stopper 47 to close the low pressure valve seat 4.
This is a leaf valve L that opens and closes 9c.

52 is a low-pressure refrigerant inlet pipe formed by shrinking the other end of the main body 34.

The operation of the fluid control valve configured as described above will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows a state in which the compressor 2 is stopped, and the leaf valve H40 of the high-pressure valve section 32 is operated by the biasing force of the spring 41 and the high-pressure refrigerant leaking from the compressor 2 to the low-pressure refrigerant flow pipe 35 and the seat M42. By flowing into the through hole 42a, the high-pressure valve seat 39 of the seat H36 is closed, and the high-temperature, high-pressure refrigerant in the condenser 3 can be stopped at the high-pressure refrigerant inlet pipe 37, thereby preventing the high-temperature, high-pressure refrigerant from flowing into the evaporator 5. is being prevented. Further, the leaf valve L51 of the low pressure valve section 33 is activated by the high pressure refrigerant leaking from the compressor 2 flowing into the low pressure refrigerant inlet pipe 35, and the leaf valve L51 is closed to the seat L49 due to the pressure difference with the passage 49a of the seat L49 which is in a low pressure state. The low pressure valve seat 49c is opened to prevent the high pressure refrigerant from flowing into the evaporator ε.Therefore, the high pressure circuit A and the low pressure circuit B are respectively closed.

Next, when the compressor 2 enters the operating state (Fig. 2), the high temperature and high pressure discharged refrigerant of the compressor 2 is condensed by the condenser 3 and flows into the high pressure refrigerant inlet pipe, and the through hole 42a of the sheet M42 and the low pressure refrigerant inlet pipe. 35 becomes low pressure due to refrigerant suction from the compressor, and the leaf valve H4o overcomes the pressure difference between the high and low pressures against the urging force of the receiving panel 41 to open the high pressure valve seat of the seat H36, and the leaf valve H4o opens the high pressure valve seat of the seat H36.
The high pressure refrigerant in the high pressure circuit A is prevented from flowing into the low pressure circuit B side by contacting and closing the O ring 43 which is the valve seat of the high pressure circuit A.

Further, the low-pressure refrigerant evaporated by the evaporator 6 passes through the low-pressure refrigerant inlet pipe 52, and the refrigerant pressure causes the leaf valve L51 to open from the low-pressure valve seat 49c of the seat L49, and the leaf valve L61 comes into contact with the stopper 47. .

Therefore, the refrigerant is transferred to the compressor 2 → condenser 3 → high pressure refrigerant input pipe 37 → high pressure refrigerant pressure pipe 38 → capillary tube 4 →
The flow is as follows: evaporator 6 → low-pressure refrigerant inlet pipe → through-hole 49al → low-pressure refrigerant outlet pipe 35 → compressor 2, resulting in normal refrigeration system operation.

As described above, according to this embodiment, the seat H36 is joined to one end of the cylindrical main body 34 and forms the high pressure valve seat 39, and there is a leaf inside the main body 34 that opens and closes the valve seat 39 of the seat H36. Valve H40 and the above-mentioned 7-pulg H40
a spring 41 and its guide 45 that urges the leaf valve H40 toward the high pressure valve seat 39, and a bottom panel 46 that is located between the leaf valve H40 and the spring 41 and slides on the inner surface of the guide 46;
Insert an O-ring 43 that will serve as a valve seat into the end of the main body 3.
4 and the sheet M42 fixed by the roll caulking part 44
The high pressure valve section 32 is configured by the main body 3.
4. A stopper 47 positioned and inserted by the inner circumferential convex portion 48, a seat L49 having a passage 49a in the center and forming a low pressure valve seat 49c, and fixed by the main body 34 and the roll canme portion 50, and a leaf incorporated therebetween. Valve L
61 to form the low-pressure valve part 33, and the other end of the main body 34 is contracted to form the low-pressure refrigerant inlet pipe 62, the number of parts can be reduced, and no internal parts can be placed inside the cylindrical main body 34. Since it can be installed in sequence and fixed by processing the roll caulking part 44.50, assembly work efficiency can be greatly improved, and there is no heating process such as welding of internal parts, eliminating problems such as thermal deformation, and further improving operability. Reliability can be improved because power element components that have a large influence are no longer required.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a sectional view of a fluid control valve showing a second embodiment of the present invention, showing a state in which the refrigeration system is stopped. A fluid control valve 53 is interposed in the high pressure section A between the condenser 3 and the capillary tube 4. 36 is a sheet H joined to one end of the main body 54, and the high pressure refrigerant inlet pipe 3 is connected to one side.
7 and a high-pressure refrigerant inlet pipe 38 are joined, and a high-pressure valve seat 39 is formed on the other end. Reference numeral 40 designates a leaf valve H which is biased by a spring 41 and comes into contact with the high pressure valve seat 39 of the seat H36, and opens and closes the high pressure valve seat 39 using high pressure refrigerant. 42 is a seat M in which an O-ring 43 forming a valve seat is inserted at the end and has a refrigerant through hole 42& in the center, and serves as a stopper and a valve seat when the leaf valve H40 is operated. , is fixed by the main body 54 and the roll caulking portion 44. 45 is a guide for the leaf valve H40, one end of which is the front B seat H36, and the other end of which is the guide of the leaf valve H40.
42 to determine the movement stroke of the leaf valve H40 and the position of the roll caulking portion 44 of the seat M. Reference numeral 46 denotes a bottom panel located between the leaf valve H40 and the spring 41, and the side surface of which is engaged so as to slide on the inner surface of the guide 40. The above structure is similar to the high pressure valve section 32 having the structure shown in FIG. 1. What differs from the structure shown in FIG. 1 is that the main body 54 is contracted from the end of the sheet M42 to form a pressure equalizing pipe.

The operation of the fluid control valve configured as described above will be described below.

The leaf valve H40 is activated by the biasing force of the spring 41 and the high pressure refrigerant leaking from the compressor 2 flowing into the pressure equalizing pipe 66 and the through hole 42a of the seat M42.
The high-pressure valve seat 39 of No. 6 is closed to prevent this. Furthermore, the low pressure circuit B is closed by providing a check valve 56 to prevent the high pressure refrigerant from flowing into the evaporator 5.

Therefore, the high voltage circuit A and the low voltage circuit B are each in a closed state.

Next, when the compressor 2 becomes operational (not shown),
The high temperature, high pressure refrigerant discharged from the compressor 2 is condensed by the condenser 3 and flows into the high pressure refrigerant inlet pipe.

Moreover, inside the through hole 42a of the sheet M42 and the pressure equalizing pipe 66,
When the compressor sucks refrigerant, the pressure becomes low, and the leaf valve H40 receives the pressure difference between the high and low pressures, overcomes the urging force of the spring 41, and opens the high pressure valve seat of the seat H36, and also opens the high pressure valve seat of the seat H36. It contacts and closes the Q-ring 43 to prevent high-pressure refrigerant from high-pressure circuit A from flowing into low-pressure circuit B. Further, the low-pressure refrigerant evaporated by the evaporator 5 is sucked into the AB compressor 2 through the check valve 66 .

Therefore, the refrigerant is compressor 2 - condenser 3 - high pressure refrigerant inlet pipe 37 - high pressure refrigerant outlet pipe 38 - capillary tube 4 →
The flow is from the evaporator 6 to the check valve 66 to the compressor 2, resulting in normal refrigeration system operation.

As described above, according to this embodiment, the seat H36 is joined to one end of the cylindrical main body 64 and forms the high-pressure valve seat 39, and there is a leaf inside the main body 34 that opens and closes the valve seat 39 of the seat H36. Valve H40 and the leaf valve H40
a spring 41 and its guide 46 that urges the high pressure valve seat 39; an Osae spring 46 that is located between the leaf valve H40 and the spring 41 and slides on the inner surface of the guide 46;
Insert the ○ ring 43 that will serve as the valve seat into the end of the main body 3.
4 and the sheet M42 fixed by the roll caulking part 44
By constricting the other end of the main body to form the pressure equalizing pipe 65, it is possible to reduce the size and weight, reduce the number of parts, and incorporate internal parts into the cylindrical main body 34 one after another. Since it can be fixed by processing 44, assembly work efficiency can be greatly improved, and there is no heating process such as welding internal parts, so there are no problems such as thermal deformation.
Furthermore, reliability can be improved since there is no need for power element members that greatly affect operability.

Effects of the Invention As described above, the present invention has a high-pressure valve seat formed at one end of a cylindrical body, and a seat H having a high-pressure refrigerant inlet and an outlet pipe is joined, and the high-pressure valve seat of the seat H is formed in the main body. a leaf valve H that opens and closes according to refrigerant pressure;
a spring that biases the valve against the high-pressure valve seat and its guide, an Osae spring that is located between the leaf valve H and the spring and slides on the inner surface of the guide, a Q ring at the end, and a pipe passage hole in the center. The main body and the seat M fixed by the roll caulking part constitute a high pressure valve part, and the low pressure valve part is positioned and inserted by the inner peripheral convex part of the body and fixed by the main body and the roll caulking part. By configuring the other end of the main body to form a low-pressure refrigerant entry pipe by shrinking the pipe, the number of parts can be reduced, and internal parts can be sequentially assembled into the cylindrical main body and fixed by machining the roll caulking part. As a result, assembly workability can be greatly improved, there is no heating process such as welding internal parts, there is no problem such as thermal deformation, and there is no need for power element parts that greatly affect operability. This makes it possible to realize an excellent fluid control valve that has great practical effects such as improved reliability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the fluid control valve in an operating state of the refrigeration system in one embodiment of the present invention, FIG. 2 is a sectional view showing the operating state of the refrigeration system in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a sectional view of a conventional fluid control valve in a state where the refrigeration system is stopped. 32... High pressure valve part, 33... Low pressure valve part, 34... Main body, 36... Seat H1
37... High pressure refrigerant inlet pipe, 38... High pressure refrigerant outlet pipe, 39... High pressure valve seat, 40...
... Leaf valve H141 ... Spring, 42.
... Sheet M, 42a ... Through hole, 43
...0 ring, 44,50...roll caulking part, 46...guide, 46...
Osae spring, 48... Inner peripheral convex portion, 52...
...Low pressure refrigerant inlet pipe, 66... Pressure equalization pipe. Name of agent: Patent attorney Shigetaka Awano and 1 other person Sheet d

Claims (2)

[Claims] (1) A cylindrical main body with a low-pressure refrigerant outlet pipe joined to the side surface, a seat H joined to one end of the main body to constitute a high-pressure valve seat and equipped with a high-pressure refrigerant inlet pipe and a high-pressure refrigerant outlet pipe, and the main body a leaf valve H that is incorporated in the seat H and opens and closes the valve seat of the seat H by refrigerant pressure; a spring that urges the leaf valve H toward the high pressure valve seat; a guide for the leaf valve; and a spring for the leaf valve H and the spring. and a seat M having a through hole in the center and an O-ring at the end, and fixed to the main body by the roll caulking part. A high-pressure valve part is configured by the above-mentioned body, and a low-pressure valve part is positioned and inserted by the inner circumferential convex part of the main body and fixed by the main body and a roll caulking part, and the other end of the main body is condensed to form a low-pressure refrigerant inlet. A fluid control valve characterized by forming a pipe. (2) Claim 1 characterized in that only the high-pressure valve portion is formed within the main body, and an end portion of the main body is contracted to form a pressure equalizing pipe.
Fluid control valve described in.