JPH03213970A - Fluid control valve - Google Patents

Abstract

PURPOSE:To greatly enhance the assembling workability of a fluid control valve by forming a high pressure valve part and a low pressure valve part by successively assembling internal parts in a cylindrical body and fixing them with a roll caulking part. CONSTITUTION:A high pressure valve seat 39 is formed on one end of a cylindrical body 34, with which a first sheet 36 composed of a high pressure refrigerant inlet pipe 37 and an outlet pipe 38 is joined. A high pressure valve part 32 is adapted to include in the body 34 a first leaf valve 40 for opening and closing the high pressure valve seat 39 of the first sheet 36 with refrigerant pressure, a spring 41 for biassing the first leaf valve 40 to the high pressure valve seat 39 and a guide 45 therefor, and a second seat 42 with a through-hole 42a formed centrally thereof fixed to the body through a roll caulking part 44 and including a valve seat formed with insert resin at an end of the second seat 42. Further, there is provided a low pressure valve part 33 positioned and inserted by an internal peripheral projection 47 of the body 34 and fixed by the roll caulking part 49, and the other end of the body is adapted to form a low pressure refrigerant inlet pie 51 using a compression pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is installed in a refrigeration cycle such as a refrigerator.

This conventional fluid control valve will be explained below.

FIG. 3 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 first valve device 6 interposed in a high pressure circuit A between a condenser 3 and a capillary tube 6, and a second valve device interposed in a low pressure circuit B between an evaporator 6 and a compressor 2. It has a valve device 7.

The first and second valve devices 6.7 are formed in an upper casing 8 and a lower casing 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 7 of the lower casing 9 are divided into upper and lower parts by a power valve device 10 fixed to the upper casing 8 and consisting of a bellows. The device 6 includes a valve seat body 13 formed between a high-pressure refrigerant inlet vibrator 11 and a high-pressure refrigerant outlet vibrator 12.
and a valve 14 that opens and closes this valve seat body 13.

The lower end of this valve 14 is fitted into a recess 15 of the power element 10, and the power element 10 senses the pressure difference between the high pressure circuit A and the low pressure circuit B as well as the power element 1o.
The valve seat body 13 is opened and closed by the expansion and contraction force of the valve seat body 13 and the pressure adjustment spring 16 that adjusts the expansion and contraction force of the power element 10. Also, the second valve device 7
consists of a valve seat body 20 formed on a connecting member 19 having a low-pressure refrigerant inlet vibrator 18 fixed to one open end 1 of the lower cushioning 9, and a leaf valve 21 that opens and closes this valve seat body 20 by fluid pressure. configured.

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 that 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
0 senses this pressure difference, is lifted by the medium pressure, and comes into contact with the stopper surface 28 of the adjustment member 23. 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 vibrator 22. At this time, the element 10 senses the pressure difference between the high pressure circuit A and the low pressure circuit B, and pushes up the valve 14 by the biasing force of the spring 16, thereby closing the valve seat body 13. Both the high-pressure circuit A and the low-pressure circuit B are closed by first and second valve devices 6 and 7 to prevent 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, a complex structure, and a complicated assembly process.

Furthermore, since the operation is regulated by the power element 10, there is a drawback that if the power element 10 is destroyed due to abnormal pressure, the refrigeration system will not be cooled at all.

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 first seat provided with high pressure refrigerant inlet and outlet pipes. , in the main body the first
a first leaf pulp that opens and closes a high-pressure valve seat of the seat by refrigerant pressure; a spring and its guide that urges the first leaf pulp toward the high-pressure valve seat; and a through hole in the center; A second seat having a valve seat molded with insert resin at the end constitutes a higher pressure valve part, and is positioned and inserted by the inner circumferential convex part of the main body, and fixed by the main body and the roll caulking 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.

Effect The present invention can reduce the number of parts by the above-described configuration.
Furthermore, since the internal parts can be assembled one after another into the cylindrical body and fixed by roll caulking, the assembly work efficiency is greatly improved.

Furthermore, the i1! valve seat is made of soft resin. Since it has excellent surface adhesion with J-7 pulp, the sealing performance of C)M can be stabilized and reliability can be improved.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. 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 fluid 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
The main body 34 has a cylindrical shape and forms an outer shell. Reference numeral 35 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 first sheet 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 39.
is formed. Reference numeral 4o denotes a first resin-made pulp that is biased by a spring 41 and comes into contact with the high-pressure valve seat 39 of the first seat 36, and opens and closes the high-pressure valve seat 39 using the high-pressure refrigerant. 42 is a high pressure valve seat 4 insert-molded at the end.
3 and has a refrigerant through hole 42a in the center, and serves as a stopper and a valve seat when the first leaf pulp 40 is operated, and is fixed to the main body 34 and the roll caulking part 44. has been done. 46 is a guide for the first leaf pulp 4o, one end of which is connected to the first sheet 36. The other end is brought into contact with the second sheet 42 to determine the movement stroke of the first leaf pulp 4o and the position of the roll caulking portion 44 of the second sheet.

Next, the configuration of the low pressure valve section 33 will be explained. 46 is the main body 3
This is a stopper that is positioned and inserted into the inner peripheral convex portion 47 of No. 4. 48 has a hole 48a in the center and an outer peripheral notch 48
b is a seat L that is positioned by engaging with one end of the stopper 46 and fixed to the main body 34 by roll caulking 49 to form a low pressure valve seat 48c. 50 is in contact with the low pressure valve seat 48c of the second seat 48 and is actuated by the refrigerant flow, moves to the claw portion 46a of the stopper 46, and closes the low pressure valve seat 4.
This is a second leaf valve that opens and closes 8c.

51 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 the compressor 2 in a stopped state, and the first leaf pulp 40 of the high-pressure valve section 32 is affected by the biasing force of the spring 41 and the high-pressure refrigerant leaking from the compressor 2 into the low-pressure refrigerant outlet pipe 36. By flowing into the through hole 42a of the second seat 42, the high pressure valve seat 39 of the first seat 36 is closed, and the high temperature and high pressure refrigerant in the condenser 3 can be stopped up to the high pressure refrigerant inlet pipe 37. The flow into the evaporator 6 is prevented. In addition, the first leaf pulp 6o of the low pressure valve section 33 is connected to the opening 48a of the first sheet 48 which is in a low pressure state due to the high pressure refrigerant leaking from the compressor 2 flowing into the low pressure refrigerant outlet pipe 36. The pressure closes the low pressure valve seat 48c of the first seat 48, preventing 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 enters the operating state (Fig. 2), the high-temperature, high-pressure discharge 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 second sheet 42 and the low-pressure refrigerant outlet. The inside of the pipe 36 becomes low pressure due to the suction of refrigerant from the compressor, and the first leaf valve 40 receives the pressure difference between the high and low pressures, overcomes the biasing force of the spring 41, and opens the high pressure valve seat of the first (1) H2S. , the second seat 42 contacts and closes the insert resin valve seat 43 to prevent the high-pressure refrigerant from the high-pressure circuit A from flowing into the low-pressure circuit B side.

Further, the low-pressure refrigerant evaporated by the evaporator 6 passes through the low-pressure refrigerant inlet pipe 61, and the refrigerant pressure causes the first leaf pulp 6o to flow through the low-pressure refrigerant inlet pipe 61.
is opened by the low pressure valve seat 48c of the first seat 48, and the first leaf valve 60 comes into contact with the guide 46.

Therefore, the refrigerant is transferred to the compressor 2 → condenser 3 → high pressure refrigerant inlet pipe 37 → high pressure refrigerant outlet pipe 38 → capillary tube 4 →
The flow is as follows: evaporator 6 → low-pressure refrigerant inlet pipe → through-hole 4sa → low-pressure refrigerant outlet pipe 36 → compressor 2, resulting in normal refrigeration system operation.

As described above, according to this embodiment, the first seat 36 is joined to one end of the cylindrical main body 34 and forms the high pressure valve seat 39, and the valve seat 39 of the first seat 36 is disposed within the main body 34. A first leaf valve 40 that opens and closes, a spring 41 and its guide 46 that urges the first leaf valve 4o toward the high pressure valve seat 39, and a second seat fixed to the main body 34 by a roll caulking portion 44. 42 constitutes the high pressure valve part 32, and a stop horn 46 positioned and inserted by the inner periphery convex part 47 of the main body 34, and a passage 4 in the center.
The low-pressure valve part 33 is formed by the first sheet 48, which has a first sheet 48 having a diameter of 8a and forms a low-pressure valve seat 48c, and is fixed by the main body 34 and the roll caulking part 49, and the second leaf pulp 60 incorporated therebetween. By constricting the other end of the main body 34 to form the low-pressure refrigerant inlet pipe 51, the number of parts can be reduced, and internal parts can be sequentially assembled into the cylindrical main body 34 by machining the roll caulking parts 44 and 49. Since it can be fixed, assembly work efficiency can be greatly improved, and since the valve seat is made of resin, the sealing performance with the valve can be improved.

Effects of the Invention As described above, the present invention has a first sheet formed with a high-pressure valve seat at one end of a cylindrical body and provided with a high-pressure refrigerant inlet and an outlet pipe. A first leaf valve that opens and closes the valve seat by refrigerant pressure, a spring and its guide that urges the first leaf valve toward the high-pressure valve seat, a through hole in the center, and is fixed by the main body and a roll caulking part. and a second seat having a valve seat molded with an insert resin at the end thereof to constitute a high pressure valve part, and a low pressure valve part which is positioned and inserted by the inner circumferential convex part of the main body and fixed to the main body by a roll caulking part. The other end of the main body is configured to form a low-pressure refrigerant inlet pipe by shrinking the pipe, which reduces the number of parts and allows the internal parts to be sequentially assembled into the cylindrical main body and machining of the roll caulking part. Since it can be fixed in place, assembly work efficiency can be greatly improved, and since the valve seat is made of resin, sealing performance with the valve can be improved, making it possible to realize an excellent fluid control valve with great practical effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the fluid control valve in an embodiment of the present invention when the refrigeration system is stopped, FIG. 2 is a sectional view showing the refrigeration system in operation in FIG. 1, and FIG. 3 is a conventional fluid control valve. FIG. 2 is a cross-sectional view of the valve showing a state in which the refrigeration system is stopped. 32...High pressure valve part, 33...Low pressure valve part, 34...Main body, 36...First seat,
37... High pressure refrigerant inlet pipe, 38... High pressure refrigerant outlet pipe, 39... High pressure valve seat, 4o...
...First leaf valve, 41...ノ(ne, 42)
...Second sheet, 42a...Through hole,
43...K pressure valve seat, 44.49...Roll caulking part, 46...Guide, 47...
...Inner peripheral convex portion, 51...Low pressure refrigerant inlet pipe, 64
・・・・・・Pressure equalization pipe. Diagram

Claims (1)

[Claims] a cylindrical body with a low-pressure refrigerant outlet pipe joined to the side surface; a first seat joined to one end of the body to constitute a high-pressure valve seat and provided with a high-pressure refrigerant inlet pipe and a high-pressure refrigerant outlet pipe; a first leaf valve that is incorporated and opens and closes the valve seat of the first seat by refrigerant pressure; a spring that urges the first leaf valve toward the high-pressure valve seat; a guide for the first leaf valve; and a through hole in the center. The second seat has a valve seat at its end and is fixed to the main body by the roll crimping part, and constitutes a higher pressure valve part. A fluid control valve having a fixed low pressure valve portion, the other end of the main body being constricted to form a low pressure refrigerant inlet pipe, and the valve seat of the second seat being an insert molded product.