JPH037865A - Fluid control valve - Google Patents

Abstract

PURPOSE:To provide a fluid control valve which has high reliability by a method wherein a sleeve having a bore slightly larger than that of a first leaf valve is nipped between third and first valve seat bodies. CONSTITUTION:First and second valve devices 6 and 7 located in high and low pressure circuits A and B of a fluid control valve 1 are formed in a cylindrical body 8, and are vertically divided by means of a third valve device 9. During running of a rotary compressor 2, a first leaf valve 13 is adsorbed to a third valve seat body 22, and an inlet 10 and an outlet 11 of the valve device 6 are intercommunicated. A high pressure refrigerant continuously flows from a condenser 3 to a capillary tube 4. A leaf valve 17 of the valve device 7 is opened by means of a force of gas flowing from an inlet 16 to an outlet 18, and a low pressure refrigerant continuously from a vaporizer 5 to the rotary compressor 2 to perform freezing operation. In this case, since a sleeve 24 is nipped between valve seat bodies 22 and 12, a relative distance between the valve seat bodies 22 and 12 is specified at an optimum motion distance, and the leaf valve 13 is reliably attracted to the valve seat body 22.

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 cycle of a refrigerator or the like and opens and closes this cycle.

Conventional technology For example, in a refrigeration cycle such as a refrigerator that uses a high-pressure container-type electric compressor, when the electric compressor stops, the low-pressure side of the refrigeration cycle becomes a high-pressure state due to the effect of pressure balance, and the evaporator is connected to the evaporator through the low-pressure side. Since high-pressure gas flows into the evaporator from the condenser on the high-pressure side through the capillary, there is a large heat load on the evaporator when the operation is restarted, which inevitably increases the amount of power consumed. There is a problem with this.

Conventionally, in order to prevent superheated gas from flowing into the evaporator from the high-pressure side and the low-pressure side, there is a fluid control valve that uses the fluid pressure within the system to achieve this purpose, but the power that separates the two valve devices is Since it has elements, it is inevitably large in size, requires strict assembly accuracy, and takes a long time to assemble, which increases costs and makes it impossible to meet the recent demand for lower costs.

A conventional fluid control valve using a diaphragm will be described below with reference to the drawings.

Conventional fluid control valves include, for example, Utility Model Publication No. 61-32210.
It is known from the publication No.

FIG. 2 shows a refrigeration system using a conventional fluid control valve.

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

The fluid control valve 26 has a first valve device 31 interposed in a high pressure circuit A between the condenser 3 and the capillary tube 4, and a low pressure circuit B between the evaporator 6 and the rotary compressor 2.
and a second valve device 32 interposed therein. This first
and second valve devices 31 and 32 are formed in the upper casing 33 and the lower casing 34, respectively.
．． 34 are integrally combined to constitute the fluid control valve 26. That is, the first valve device 31 of the upper casing 33 and the second valve device 32 of the lower casing 34 are fixed to the upper casing 33 and divided into upper and lower parts by a power element 36 made of a bellows. The valve device 31 includes a valve seat body 38 formed between a refrigerant inlet vibe 36 and a refrigerant outlet vibe 37, and a valve 39 that opens and closes this valve seat body 38.
It consists of

The lower end of this valve 39 is fitted into the recess 4o of the power element 35, and the pressure difference between the high pressure circuit A1 and the low pressure circuit B detected by the power element 36 as well as the pressure difference between the power element 35 and
The valve seat body 38 is opened and closed by the expansion and contraction force of the valve seat body 38 itself and also by the pressure adjustment spring 41 that adjusts the expansion and contraction force of the power element 35. Also, the second valve device 3
2 is composed of a valve seat body 45 formed on a connecting pipe 44 having a refrigerant inlet vibrator 43 fixed to one open end 42 of the lower casing 34, and a leaf pulp 46 that opens and closes the valve seat body 45 by fluid pressure. be done.

Note that the refrigerant outlet vibe 47 constituting the low pressure circuit B is provided in the upper casing 33.

On the other hand, 48 is a cylindrical adjustment member that is engaged with a threaded portion 49 inside the lower open end of the upper casing 33.

5o is an O ring, which connects the upper casing 33 and the lower casing 34 to the opening stepped part 51 of the upper casing 33.
The opening end 62 of the lower casing 34 is caulked and sealed to form an airtight seal.

To briefly explain the operation of the fluid control valve 26, when the rotary compressor 2 is operating, the high pressure circuit A naturally becomes high pressure and the low pressure circuit B becomes low pressure, so the power element 35 senses this pressure difference. , spring 41
The valve 39 opens the valve seat body 38 by overcoming the urging force of
Contact with 3. The refrigerant is rotary compressor 2.
- 4 condenser 3 - first valve device 31 - capillary tube 4 - evaporator 6 - second valve device 32 - rotary compressor 2 and performs normal refrigeration action. When the rotary compressor 2 stops, high-pressure gas flows backward from the suction side of the compressor 2 and flows into the fluid control valve 26 from the refrigerant outlet vibrator 47, but the leaf pulp 46 closes the valve seat body 45 due to this reverse pressure. , power element 3
6 senses the pressure difference at this time and pushes up the valve 39 by the biasing force of the spring 41 to close the valve seat body 38.

Both the high pressure circuit A1 and the low pressure circuit B are closed by first and second valve devices 31 and 32 to prevent superheated gas from flowing into the evaporator 6.

Problems to be Solved by the Invention However, the conventional configuration described above has a large number of parts and a complicated structure, is large in size, and takes a long time to assemble.It is expensive and requires a power element to adjust the pressure. Therefore, if the power element was deformed or destroyed by large pressure, the refrigeration cycle would no longer cool down at all.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable fluid control valve that is simple in structure, inexpensive, and solves the above-mentioned conventional problems.

Means for Solving the Problems In order to achieve the above object, the fluid control valve of the present invention has a first valve device and a second valve device in a cylindrical main body, The valve device includes a first valve seat body having a first inlet and a first outlet, and a fluid pressure that simultaneously connects the first inlet and the first outlet of the first valve seat body. a first leaf pulp that opens and closes, and a spring that presses the first leaf pulp against the first valve seat body; the second valve device includes a second valve seat having a second inlet; a body, a second leaf pulp that opens and closes the second inlet by fluid pressure, and a second outlet provided in the body, and the first valve device and the second valve device In between, the first valve device and the second valve device are connected at the first valve.
A third valve device includes a third valve seat body that opens and closes between the valve device and the spring and supports the spring, and a third valve seat body that opens and closes between the third valve seat body and the first valve seat body. A sleeve having an inner diameter slightly larger than that of the first leaf pulp is sandwiched therebetween.

Operation With the above-described configuration, the first valve device opens when the first leaf pulp is adsorbed to the third valve seat body, and can act as a power element, and the sleeve can act as a power element. Since it is sandwiched between the valve seat body and the first valve seat body, the relative distance between the third valve seat body and the first valve seat body is constant;
The optimum operating distance of the first leaf pulp can be ensured.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and parts that are the same in structure and operation will be omitted. In Fig. 1, 1 is a fluid control valve with a condenser 3 and a capillary tube 4.
The first valve device θ is interposed in the high pressure circuit input between the evaporator 5 and the rotary compressor 2, and the second valve device 7 is interposed in the low pressure circuit B between the evaporator 5 and the rotary compressor 2. The first and second valve devices 6.7 are formed in a cylindrically formed body 8;
It is 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 pulp 13 made of a pulp steel material that simultaneously opens and closes the first inlet 1o and the first outlet 11 by fluid pressure;
This first leaf pulp valve 13 is attached to the first valve seat body 12.
It is composed of a spring 14 that presses against.

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 pulp 17 made of pulp steel material that opens and closes the second inlet 1e by fluid pressure; and an outlet 18. 1
Reference numeral 9 denotes a contracted tube portion formed between the second leaf pulp 17 and the second outlet 189 of the main body 8, and the second leaf pulp 1
Regulates the movement of 7.

The third valve device 9 is connected to the first valve device 6 and the second valve device 7.
A third valve seat body 22 is provided, which has a communication hole 2o provided between them and communicates them, and a support portion 21 that supports the spring 14, and which is opened and closed by the first leaf pulp 13.

Moreover, between the third valve seat body 22 and the first valve seat body 12,
A sleeve 24 having an inner diameter slightly larger than the first leaf pulp 13 is sandwiched.

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

When the rotary compressor 2 is operating, the high pressure circuit A is at high pressure and the low pressure circuit B is at low pressure, so the first leaf pulp 13 overcomes the biasing force of the spring 14 and is attracted to the third valve seat body 22. The first inlet 10 and the first outlet 11 of the first valve device 6 are in communication, and the high-pressure refrigerant continuously flows from the condenser 3 to the capillary tube 4 . Also, the second leaf pulp 17 of the second valve device 7 is opened by the force of the gas flowing from the second inlet 1e to the second outlet 18, and the low-pressure refrigerant continuously flows from the evaporator 5 to the rotary compressor 2. . , thus the refrigerant flows through the rotary compressor 2 - condenser 3 - first valve arrangement 6 - capillary tube 4 - evaporator 5 - second valve arrangement 7 - rotary compressor 2 to perform the normal refrigeration action.

Since the sleeve 24 is sandwiched between the valve seat body 22 of the heat removal 3 and the first valve seat body 12, the relative distance between the third valve seat body 22 and the first valve seat body 12 is optimal. Since the operating distance is constant, the first leaf pulp 13 is reliably attracted to the third valve seat body 22.

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 pulp 17 seals the second inlet 16, preventing the refrigerant from flowing into the evaporator 6 from the rotary compressor 2, and increasing the internal pressure of the second valve device 7. 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 first valve device 6 and the second valve device 7
When the pressure difference between
3, and this first leaf pulp 13 pushes up the first leaf pulp 13.
The inlet 1o and the ``th'' outlet 11 are simultaneously sealed, and the refrigerant is prevented from flowing from the condenser 3 into the capillary tube 4.

As described above, during the operation of the rotary compressor 2, the high-pressure and high-temperature refrigerant is stopped at the first valve device 6 and the second valve device 7 and does not flow into the evaporator 5. The second valve device 7 opens, and the third valve device 9 is almost unaffected by fine dust during the refrigeration cycle and reliably seals between high and low pressure. A compact fluid control valve that is inexpensive, highly reliable, and has a simple structure can be obtained without the need for a power element.

Effects of the Invention As described above, the present invention has a main body formed in a cylindrical shape.
and a second valve device, the first valve device having a first valve seat body having a first inlet and a first outlet;
A first leaf pulp that simultaneously opens and closes the first inlet and the first outlet of the first valve seat body by fluid pressure, and presses the first leaf pulp against the first valve seat body. The second valve device is configured with a spring and a second valve device.
The first valve device comprises a second valve seat body having an inlet, a second leaf pulp that opens and closes the second inlet by fluid pressure, and a second outlet provided in the main body. and a third valve seat between the second valve device and the first leaf pulp that opens and closes between the first valve device and the second valve device and supports the spring. By configuring a third valve device having a body, and sandwiching a sleeve having an inner diameter slightly larger than the first leaf pulp between the third valve seat body and the first valve seat body. It is possible to obtain a compact fluid control valve that is inexpensive, highly reliable, and has a simple structure, without requiring expensive power elements such as bellows or the like.

[Brief explanation of the drawing]

FIG. 1 is an installation diagram of a fluid control valve and a refrigeration system according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional fluid control valve and an installation diagram of a refrigeration system. 6...First valve device, 7...Second valve device, 8...Main body, 9...Third valve device, 10. ...First inlet, 11...First outlet, 12...Mountain/first valve seat body, 13...
・First leaf pulp, 14... Spring,
16...Second valve seat body, 16...Second
Entrance, 1 end...2 leaf pulp, 18.
...Second outlet, 2o...Communication hole, 22
...Mark: Third valve seat body, 24...Sleeve.

Claims (1)

[Scope of Claims] A first valve device and a second valve device are provided in a cylindrical main body, and the first valve device has a first inlet and a first outlet. a first leaf pulp that simultaneously opens and closes the first inlet and the first outlet of the first valve seat body by fluid pressure; The second valve device includes a spring that presses against the first valve seat body, and the second valve device includes a second valve seat body that has a second inlet, and a second valve seat that opens and closes the second inlet by fluid pressure. and a second outlet provided within the main body, between the first valve device and the second valve device, the first
A third valve device having a third valve seat body, which opens and closes between the first valve device and the second valve device and supports the spring, is made of leaf pulp, and the third valve device has a third valve seat body that supports the spring. A fluid control valve comprising a sleeve having an inner diameter slightly larger than the first leaf pulp sandwiched between the valve seat body No. 3 and the first valve seat body.