JPH04169763A - Fluid control valve - Google Patents

Abstract

PURPOSE:To make a positive separation between a high pressure circuit and a low pressure circuit within a fluid control valve when a compressor is operated and get a fluid control valve having a high reliability by a method wherein a position setting and inserting with an inner circumferential projection of a main body forming a high pressure valve part is set, a low pressure valve fixed to the main body with a roll fitting is provided, and a filter is placed between the high pressure valve part and the low pressure valve part. CONSTITUTION:Low pressure refrigerant evaporated by an evaporator 5 passes through a low pressure refrigerant inlet pipe 51 and the second leaf valve 50 is released by a low pressure valve seat 48c of the third seat 48 by its refrigerant pressure, and the second leaf valve 50 is abutted against a guide 46. At this time, some foreign material passes through the low pressure refrigerant inlet pipe 51 together with the low pressure refrigerant and into the fluid control valve 31. The foreign material can be prevented from entering the high pressure valve 32 with a filter 52.

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 OF THE INVENTION In recent years, rotary compressors have become mainstream as compressors for refrigerating systems such as refrigerators. However, in this refrigeration system, when the operation is stopped, the low pressure side in the rotary compressor is not in a high pressure state, and high pressure gas flows into the evaporator through the low pressure side flow path. Furthermore, since the condenser flows from the high-pressure side condenser to the evaporator via the capillary, 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.

This conventional fluid control valve will be explained below.

FIG. 5 shows a refrigeration system using a conventional fluid control valve. Reference numeral 1 designates fluid control valves, a first valve device 6 interposed in the high pressure circuit A between the condenser 3 and the capillary tube 4, and a second valve device 6 interposed in the low pressure circuit B between the evaporator 5 and the rotary compressor 2. It has a valve device 7. 1st
The second valve devices 6 and 7 are formed within a cylindrical main body 8, and are divided into upper and lower sections by a third valve device 9.

The first valve device 6 is attached to one end surface of the main body 8 by welding, and a first inlet 10 communicating with the condenser 3 and a first outlet 11 communicating with the capillary tube 4 are formed on the same end surface. a first valve seat body 12, a first leaf valve 13 made of pulp steel material that opens and closes the first inlet 10 and the first outlet 11 simultaneously by fluid pressure;
A spring 14 presses the first leaf valve 13 against the first valve seat body 12.

A second valve device 7 is attached to the other end surface of the main body 8 by welding, and a second valve device 7 forms a second inlet 16 communicating with the evaporator 6.
a second leaf valve 17 made of valve steel material that opens and closes the second inlet 16 by fluid pressure, and a second leaf valve 17 that opens into the main body B and communicates with the rotary compressor 2 and an outlet 18. 1
Reference numeral 9 denotes a constriction section formed between the second leaf valve 17 and the second outlet 18 of the main body 8;
Regulates the movement of 7. The refrigerant flows around the second leaf valve 17 and between the main body 80.

The third valve device 9 is provided between the first valve device 6 and the second valve device 7, has a communication hole 20 that communicates them, and a support portion 21 that supports the spring 14. A third valve seat body 22 that is opened and closed by one leaf valve 13 is provided. Further, an annular groove 23 having a substantially U-shaped cross section is formed on the end surface of the third valve seat body 22 on the side of the first leaf valve 13, and an O-ring 24 is inserted into the annular groove 23.

In the above configuration, the operation will be explained next.

When the rotary compressor 2 is in operation, the high pressure circuit A becomes high pressure and the low pressure circuit B becomes low pressure, so the first leaf valve 13 overcomes the biasing force of the spring 14 and the third
The first inlet 10 and first outlet 11 of the first valve device 6 communicate with each other, and the high-pressure refrigerant continuously flows from the condenser 3 to the capillary tube 4 . Further, the second leaf valve 17 of the second valve device 7 is connected to the second inlet 1
Opened by the force of Ganu flowing from 6 to the second 8 mouth 18,
Low pressure refrigerant flows continuously from the evaporator 6 to the rotary compressor 2. In this way, the refrigerant flows from the rotary compressor 2 to the condenser 3 to the first valve device 6 to the capillary tube 4 to the evaporator 5 to the second valve device 7 to the rotary compressor 2, thereby performing a normal refrigeration action.

When the rotary compressor 2 then stops, the high-pressure refrigerant flows back from the rotary compressor 2 and flows into the second valve arrangement 7 through the second outlet 18 . Therefore, the second leaf valve 17id and the second (li) inlet 16t [stop,
The refrigerant is prevented from flowing into the evaporator 5 from the rotary compressor 2, and the internal pressure of the second valve device 7 increases. Further, since the pressure in the high pressure circuit A decreases as the rotary compressor 2 stops, the internal pressure of the first valve device 6 decreases. In this way, the pressure difference between the first valve device 6 and the second valve device 7 is reduced, and this force is applied to the spring 14.
When the biasing force is overcome, the spring 14 pushes up the first leaf valve 13, and the first inlet 10 and the first outlet 11 are simultaneously sealed by the first leaf valve 13,
The flow of refrigerant from the condenser 3 into the capillary tube 4 is blocked.

Problem to be Solved by the Invention However, in the conventional configuration described above, foreign matter that has flowed into the second valve device 7 passes through the communication hole 2o of the third valve device 9 and flows into the first valve device 6. , when the rotary compressor 2 is operating, the first leaf valve 13 and the O-ring 24
During this period, the refrigerant in the high-pressure circuit A flows into the low-pressure circuit B through the communication hole 20, and there is a problem that the refrigerant flowing into the capillary tube 4 decreases, which may impede the refrigeration effect. was.

The present invention solves the above conventional problems, and improves reliability by preventing foreign matter from entering the first valve device and reliably isolating the high pressure circuit and low pressure circuit in the fluid control valve during compressor operation. The purpose is to provide a high fluid control valve.

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 and a first seat provided with high pressure refrigerant inlet and outlet pipes joined to one end of the main body. , in the main body the first
A first reel valve that opens and closes a high-pressure valve seat on a seat by refrigerant pressure, a spring and its guide that biases the first leaf valve toward the high-pressure valve seat, a sealing member at the end, and a through hole in the center. , the main body and a second seed 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 circumferential convex part of the main body and fixed by the main body and the roll caulking part. ,
A filter is interposed between the high pressure valve section and the low pressure valve section.

Further, the filter is configured to be a permanent magnet on a disk having at least one hole.

Effect of the Invention With the above-described configuration, the present invention can prevent foreign matter from flowing into the high-pressure valve part from the low-pressure valve part, reliably isolate the high-pressure circuit and low-pressure circuit in the fluid control valve during compressor operation, and is reliable. can improve sexual performance.

EXAMPLE An example of the present invention will be described below with reference to the drawings. Incidentally, structures that are the same as those in the prior art are designated by the same numbers and detailed explanations thereof will be omitted.

FIG. 1 is a cross-sectional view of a fluid control valve according to an embodiment of claim 1 of the present invention, showing the refrigeration system in a stopped state, and FIG. 2 showing the same operating state. Also,
FIG. 3 is a sectional view of the main part.

FIG. 4 is a sectional view of a main part of an embodiment according to claim 2.

Reference numeral 31 designates fluid control valves, including a high-pressure valve part 32 interposed in the high-pressure circuit A between the condenser 3 and the capillary tube 4, and a low-pressure part 33 interposed in the low-pressure circuit B between the evaporator 5 and the compressor 2.
The cylindrical main body 34 has a cylindrical shape and forms 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 high pressure valve section 3
The second configuration will be explained. A first sheet 36 is joined to one end of the main body 34, and a high pressure refrigerant inlet pipe 37 and a high pressure refrigerant outlet pipe 38 are joined to one end, and a high pressure valve seat 39 is formed on the other end. Reference numeral 4o designates a first leaf valve 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 high-pressure refrigerant. 4
Reference numeral 2 denotes a second sheet having a sealing member 43 forming a valve seat inserted at the end and having a refrigerant through hole 42a in the center, and serves as a stopper and a valve seat when the first leaf valve 40 is operated. The main body 34 is fixed by the roll caulking portion 44 and the roll caulking portion 44. 45 is the first
It is a guide for the leaf valve 4o, and has one end in contact with the first seat 36 and the other end in contact with the second seat 42 to determine the movement stroke of the leaf valve 4o and the position of the roll caulking portion 44 of the second seat. There is.

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 by the inner peripheral convex portion 47 of No. 4. 48 has a hole 48a in the center and an outer peripheral notch 48
A third seat is positioned by engaging one end of the stopper 46, and is fixed to the main body 34 and the roll caulking portion 49 to form a low pressure valve seat 48C. 6o is the third
This is a second leaf valve that comes into contact with the low-pressure valve seat 48C of the seat 48, is activated by the refrigerant flow, moves to the claw portion 46a of the stopper 46, and opens and closes the low-pressure valve seat 48c. 61 is a low-pressure refrigerant inlet pipe formed by shrinking the other end of the main body 34.

52 is a filter interposed between the high pressure valve section 32 and the low pressure valve section 33; the low pressure valve section 33 of the second seat 42;
It is locked on the side by a ring 53.

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

FIG. 1 shows a state in which the compressor 2 is stopped, and the first leaf valve 40 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 into the low-pressure refrigerant outlet pipe 35. 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. This is done by preventing the refrigerant from flowing into the evaporator 6. Also, the second leaf valve 5 on the low pressure valve seat 33
When the high-pressure refrigerant coming from the compressor 2 flows through the low-pressure refrigerant outlet pipe 36, the low pressure of the third sheet 48 is caused by the pressure difference with the passage 48a of the third sheet 48, which is in a low pressure state. The valve seat 48c is opened and closed to prevent 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. Here, there is a risk that foreign matter may enter the fluid control valve 31 through the low-pressure refrigerant outlet pipe 35 together with the high-pressure refrigerant leaking from the compressor 2.
It is possible to prevent foreign matter from entering 2.

Next, when the compressor 2 comes into operation (FIG. 2), 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.

Further, the pressure inside the through hole 42a of the second sheet 42 and the low pressure refrigerant outlet pipe 36 becomes low due to the refrigerant suction of the compressor.
The first leaf valve 40 receives the pressure difference between the high and low pressures with the spring 4
The high-pressure valve seat of the first seat 36 is opened by overcoming the biasing force of the second notebook 42, and the high-pressure refrigerant of the high-pressure circuit A flows into the low-pressure circuit B.
Prevent it from flowing into the side. Further, the low-pressure refrigerant evaporated by the evaporator 6 passes through the low-pressure refrigerant inlet pipe 61, and its refrigerant pressure causes the second leaf valve 60 to be opened by the low-pressure valve seat 48c of the third seat 48, and the second leaf valve 5o is guided. 46
It came into contact with the situation.

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 5 → low-pressure refrigerant inlet pipe 61 → through-hole 49a → low-pressure refrigerant outlet pipe 35 → compressor 2, resulting in normal refrigeration system operation. At this time, there is a possibility that foreign matter may enter the fluid control valve 31 along with the low-pressure refrigerant through the low-pressure refrigerant inlet pipe 51, but the filter 52 can prevent foreign matter from entering the high-pressure valve section 32.

Further, as shown in FIG. 4, a disk-shaped permanent magnet 54 having a hole 54a around the filter 52 is used, and the second
By locking the seat 42 on the low-pressure valve portion 33 side, when the compressor 2 is stopped, foreign matter that enters through the low-pressure refrigerant outlet pipe 36 together with the high-pressure refrigerant leaking from the compressor 2 is removed from the permanent It is attracted by the magnet and can be prevented from entering the high pressure valve section 32. Similarly, during operation of the compressor 2, foreign matter that enters together with the low-pressure refrigerant through the low-pressure refrigerant inlet pipe 51 is attracted to the permanent magnet 54, and can be prevented from entering the high-pressure valve section 32.

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 45 that urges the first leaf valve 4o toward the high pressure valve seat 39, and a seal member 43 at the end that serves as the valve seat.
The second seat 42 is inserted and fixed by the main body 34 and the roll caulking part 44, and the high-pressure valve part 32 is constructed. The low pressure valve section 33 is operated by a third seat 48 which has an opening 48a and forms a low pressure valve seat 48c and is fixed to the main body 34 and the roll caulking section 49, and a second leaf valve 6o installed therebetween. and locking the filter 52 to the low pressure valve part 32 side of the second seat 42 using a ring 53 in order to interpose the filter 52 between the high pressure valve part 32 and the low pressure valve part 33,
By constricting the other end of the main body 34 to form a low-pressure refrigerant outlet pipe 51, foreign matter can be prevented from entering the high-pressure valve section 32, and the high-pressure circuit inside the fluid control valve 31 during operation of the hump presser 2 can be prevented. A and low voltage circuit B can be reliably isolated and reliability can be improved.

In addition, by using the filter 62 as a disk-shaped permanent magnet 54 having a hole 54a in the center, it is possible to similarly prevent foreign matter from entering the high-pressure valve section 32, and to prevent foreign matter from entering the fluid control valve 31 when the compressor 2 is operating. The high voltage circuit A and the low voltage circuit B can be reliably isolated and reliability 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 whose valve seat is opened and closed by refrigerant pressure; a spring and its guide which urges the first leaf valve toward the high-pressure valve seat;
A seal member is provided at the end and a pipe passage hole is provided in the center, and the main body and the second seat fixed by the roll caulking portion constitute a high pressure valve portion, and the main body is positioned and inserted by the inner circumferential convex portion of the main body. and a low-pressure valve part fixed by a roll caulking part, a filler is interposed between the high-pressure valve part and the low-pressure valve part, and the other end of the main body is contracted to form a low-pressure refrigerant inlet pipe. This configuration prevents foreign matter from entering the high-pressure valve section and reliably isolates the high-pressure circuit and low-pressure circuit within the fluid control valve during compressor operation, making it possible to create a highly reliable fluid control valve. be.

In addition, by using the filler as a disk-shaped permanent magnet having at least one hole, it is possible to prevent foreign matter from entering the high-pressure valve part, and to prevent foreign matter from entering the high-pressure valve and the low-pressure circuit in the fluid control valve during compressor operation. Since the fluid can be reliably isolated, a highly reliable fluid control valve can be realized.

[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 the same fluid control valve. FIG. 4 is a cross-sectional view of a main part of a fluid control valve showing another embodiment, and FIG. 6 is a cross-sectional view of a conventional fluid control valve system. 32...High pressure valve section, 33...Low pressure valve section, 34...Main body, 36...Seat, 3
7... High pressure refrigerant inlet pipe, 38... High pressure refrigerant outlet pipe, 39... High pressure valve seat, 40...
...Leaf valve, 41...Spring, 42...
... Sheet, 42a, old... Through hole, 43...
・Seal member, 44. 49...Roll caulking part, 45...Guide, 47...Inner periphery convex part, 51...Low pressure refrigerant inlet pipe, 62.・・・・・・
Filter, -64...Permanent magnet, 54a...
...hole. Name of agent: Patent attorney Akira Okaji and 2 others 32-
m-tsume 1 pressure rhyme 42 -ichiyu 2 notes 33---shiki pressure well gun 42a -1jiAa
34--One #, 43-Seal cup 3q-iFL8. i st
-1 Mr. H Ka Fukuka entering o%i・4θ --1 Cram school! Leaf Half 52--One Leaf 41-Spring Figure 1. 34-m-main body, 36-1-first seat 3q--1 high pressure 4θ--1st leaf valve 41-spring 42--12nd seat 42a--1! ：Jshi 43'- Sea Jshi member 44 ゛-°Roll caulking 45-1-Force side 3 Fig. 5-2-m
- Filter 34 Main body 43 Nuru knot material μ Roll caulking device Y 544 Old age 4 Diagram 54

Claims (2)

[Claims] (1) a cylindrical body with a low-pressure refrigerant outlet pipe joined to the side surface; a first sheet 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 in the main body and opens and closes the valve seat of the first seat based on refrigerant pressure; a spring that biases the first leaf valve toward the high-pressure valve seat; and a guide for the leaf valve; The second seat, which has a through hole and a sealing member at its end, is fixed to the main body and the roll caulking part to constitute a high pressure valve part. and a low-pressure valve part fixed by a caulking part, a filter is interposed between the high-pressure valve part and the low-pressure valve part, and the other end of the main body is contracted to form a low-pressure refrigerant inlet pipe. Fluid control valve. (2) The fluid control valve according to claim 1, wherein the filter is a disk-shaped permanent magnet having at least one hole.