JP2678043B2 - Fluid control valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid control valve that is provided in a refrigeration cycle such as a refrigerator and that opens and closes this cycle.

2. Description of the Related Art For example, in a refrigeration cycle such as a refrigerator using an electric compressor of a high-pressure container type, when this 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 high-pressure gas flows into the evaporator through the low-pressure side, and the condenser, which is the high-pressure side, also flows into the evaporator through the capillary. When restarting, there is a problem that a large heat load is applied to the evaporator and the power consumption for consumption is necessarily increased.

Conventionally, there is a fluid control valve that achieves this purpose by using the fluid pressure in the system to prevent the inflow of superheated gas from the high pressure side and low pressure side into the evaporator. Since it has an element, it is inevitably large in size, the assembly accuracy is strict, and the assembly time is long,
Costs have risen, and it has become impossible to meet the recent demand for cost reduction.

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

A conventional fluid control valve is known, for example, from Japanese Utility Model Publication No. Sho 61-32210.

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

26 is a fluid control valve, 27 is a high-pressure container type electric compressor (hereinafter referred to as a rotary compressor), 28 is a condenser, 29 is a capillary tube, and 30 is an evaporator.

The fluid control valve 26 includes a first valve device 31 interposed in the high pressure circuit A between the condenser 28 and the capillary tube 30,
It has a second valve device 32 interposed between the evaporator 30 and the rotary compressor 27 and in the low pressure circuit B. The first and second valve devices 31 and 32 are respectively formed in the upper casing 33 and the lower casing 34, and both casings 33 and 34 are integrally combined to constitute the fluid control valve 30. That is, the first valve device 31 of the upper casing 33 and the lower casing 34
The second valve device 32 is vertically fixed to the upper casing 33 by a power element 35 made of a bellows, and the first valve device 31 is formed between a refrigerant inlet pipe 36 and a refrigerant outlet pipe 37. The valve seat body 38 and the valve 39 that opens and closes the valve seat body 38. The lower end of this valve 39 is fitted in the recess 40 of the power element 35, and the power element 35
The valve seat body 38 is opened and closed by the pressure difference between the high-voltage circuit A and the low-voltage circuit B sensed by the pressure sensor, the expansion and contraction force of the power element 35 itself, and the pressure adjustment spring 41 for adjusting the expansion and contraction force of the power element 35. is there. Further, the second valve device 32 opens and closes the valve seat body 45 with the fluid pressure, and the valve seat body 45 formed in the connection pipe 44 having the refrigerant inlet pipe 43 fixed to one opening end 42 of the lower casing 34. It is composed of a leaf valve 46.

The refrigerant outlet pipe 47 that constitutes the low-voltage circuit B is provided in the upper casing 33.

On the other hand, reference numeral 48 is a tubular adjusting member screwed into a screw portion 49 inside the lower opening end of the upper casing 33.

Reference numeral 50 denotes an O-ring, and the upper casing 33 and the lower casing 34 are caulked and fixed at the opening end portion 52 of the lower casing 34 by the opening stepped portion 51 of the upper casing 33 to hermetically seal.

The operation of the fluid control valve 30 will be briefly described. When the rotary compressor 2 is in operation, the high pressure circuit A naturally becomes high pressure and the low pressure circuit B becomes low pressure. Therefore, the power element 35 senses this pressure difference. , 39 overcomes the urging force of the spring 41 to open the valve seat body 38, and the leaf valve 46 is also lifted by the refrigerant pressure from the refrigerant inlet pipe 43 and abuts on the stopper surface 53 of the adjusting member 48. Therefore, the refrigerant is rotary compressor 2 → condenser 3 → first
Valve device 31 → capillary tube 4 → evaporator 5 → second
The valve device 32 → rotary compressor 2 flows to perform normal refrigeration. 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 pipe 47, but the leaf valve 46 closes the valve seat body 45 by this back pressure. , The power element 35 senses the pressure difference at this time, and pushes up the valve 39 by the urging force of the spring 41, and the valve seat body
Close 38. That is, both the high pressure circuit A and the low pressure circuit B are closed by the first and second valve devices 31 and 32 to prevent the superheated gas from flowing into the evaporator 5.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, the number of parts is large and the structure is complicated, the size becomes large, and it takes a very long time to assemble, so that the cost is high and the pressure is adjusted by the power element. Therefore, when the power element is deformed or destroyed by a large pressure, the refrigeration cycle cannot be cooled at all.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluid control valve that solves the above conventional problems and has a simple structure and is inexpensive and highly reliable.

Means for Solving the Problems In order to achieve the above object, a fluid control valve of the present invention has a first valve device and a second valve device in a main body formed in a cylindrical shape. And a first valve seat body having a first inlet and a first outlet, and the first valve seat body according to the fluid pressure.
A first leaf valve that simultaneously opens and closes the first inlet and the first outlet of the valve seat body, and a spring that presses the first leaf valve toward the first valve seat body, The second valve device includes a second valve seat body having a second inlet and a second valve seat body that opens and closes the second inlet by fluid pressure.
And a second outlet provided in the main body, and between the first valve device and the second valve device,
A third valve device having a third valve seat body that supports the spring while opening and closing the first valve device and the second valve device with the first leaf valve,
An annular groove is provided in an end surface portion of the third valve seat body on the side of the first leaf valve, and an annular elastic seal ring partially protruding from the end surface portion is inserted into the groove.

With the above configuration, the first valve device opens when the third valve device closes, and the third valve device opens the third valve device.
Since an annular groove is provided in the end face part of the valve seat body, and an annular elastic seal ring partially protruding from the end face part is pushed in,
Even if you bite in some dust, its sealing property is secured,
Since the isolation between the high voltage and the low voltage is surely performed, the function of the power element can be substituted.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same parts as those of the conventional example will be described using the same reference numerals, and the same components and operations will be omitted. In FIG. 1, reference numeral 1 denotes a fluid control valve, which is interposed in a high pressure circuit A between a condenser 3 and a capillary tube 4 and a low pressure circuit B between an evaporator 5 and a rotary compressor 2. The second valve device 7 is provided. The first and second valve devices 6 and 7 are formed in the body 8 formed in a cylindrical shape,
It is divided into upper and lower parts by the third valve device 9.

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

The second valve device 7 is attached to the other end surface of the main body 8 by welding, and forms the second inlet 16 communicating with the evaporator 5.
Valve seat body 15, a second leaf valve 17 formed of a valve steel material for opening and closing the second inlet 16 by fluid pressure, and a second leaf valve opening in the main body 8 and communicating with the rotary compressor 2. Consists of an exit 18 and. 19 is the main body 8
The movement of the second leaf valve 17 is restricted by the contracted pipe portion formed between the second leaf valve 17 and the second outlet 18.

The third valve device 9 includes a first valve device 6 and a second valve device 7.
And a third valve seat body 22 that is opened and closed by the first leaf valve 13 and that has a communication hole 20 that is provided between them and that communicates these, and a support portion 21 that supports the spring 14. Further, an annular groove 23 having a substantially U-shaped cross section is formed on the end surface of the third valve seat 22 on the side of the first leaf valve 13, and an annular elastic seal made of rubber resistant to refrigerant and oil. The ring 24 is pushed into the annular groove. The annular groove 23 is formed of the elastic seal ring 24.
Has a depth slightly protruding from the end surface of the third valve seat body 22. Here, the elastic seal ring 24 is an O of a specified size.
It may be a ring, and the annular groove 23 may have a bag-shaped cross-sectional shape (groove shape) so that the elastic seal ring 24 is hard to come off.

The operation of the above configuration will be described below. During operation of the rotary compressor 2, the high pressure circuit A becomes high pressure and the low pressure circuit B becomes low pressure, so that the first leaf valve 13 overcomes the biasing force of the spring 14 and is adsorbed to the third valve seat body 22. , The first inlet 10 of the first valve device 6 and the first
The outlet 11 is communicated with, and high-pressure refrigerant continuously flows from the condenser 3 to the capillary tube 4. In addition, the second valve device 7
The second leaf valve 17 from the second inlet 16 to the second outlet
Opened by the force of the gas flowing to 18, the low-pressure refrigerant continuously flows from the evaporator 5 to the rotary compressor 2. In this way, the refrigerant is rotary compressor 2 → condenser 3 →
First valve device 6 → Capillary tube 4 → Evaporator 5 →
It flows from the second valve device 7 to the rotary compressor 2 and performs a normal refrigerating action. At this time, if leakage occurs between the third valve seat body 22 and the first leaf valve 13, the amount of refrigerant flowing from the condenser 3 to the capillary tube 4 is reduced by the amount of leakage, and this leakage occurs. If the amount is extremely high, the normal freezing action is hindered. In this case, the main cause of the leakage is a case where fine dust in the refrigeration cycle system circulates together with the refrigerant and is caught between the third valve seat body 22 and the first leaf valve 13. However, in this embodiment, the fine dust is absorbed by the elastically deformed portion of the elastic seal valve 24, and the sealing property of the third valve device is secured.

Next, when the rotary compressor 2 is stopped, the high-pressure refrigerant flows backward from the rotary compressor 2 and flows into the second valve device 7 through the second outlet 18. Therefore, the second leaf valve 17 seals the second inlet 16, the flow of the refrigerant from the rotary compressor 2 to the evaporator 5 is blocked, and the internal pressure of the second valve device 7 rises. Further, the pressure of the high-pressure circuit A decreases as the rotary compressor 2 stops, so that 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 decreases, and when this force is overcome by the biasing force of the spring 14, the spring 14 pushes up the first leaf valve 13,
With this first leaf valve 13, the first inlet 10 and the first
The outlet 11 is closed at the same time, and the refrigerant is prevented from flowing into the capillary tube 4 from the condenser 3. As described above, while the rotary compressor 2 is in operation, the high-pressure and high-temperature refrigerant stops in the first valve device 6 and the second valve device, does not flow into the evaporator 5, and the first valve device 6 is in operation.
And the second valve device 7 is opened, the third valve device 9 is hardly affected by fine dust in the refrigeration cycle, and reliably seals between high and low pressures, so it is easy to break bellows, etc., An expensive power element is unnecessary, and a small-sized fluid control valve that is inexpensive, highly reliable, and has a simple structure can be obtained.

EFFECTS OF THE INVENTION As described above, the present invention has the first valve device and the second valve device in the main body formed in a cylindrical shape, and the first valve device has the first inlet and the first valve device. A first valve seat body having an outlet of the first valve, a first leaf valve for simultaneously opening and closing the first inlet and the first outlet of the first valve seat body by fluid pressure, and the first leaf valve. A leaf valve for pressing the leaf valve to the first valve seat body, the second valve device having a second valve seat body having a second inlet, and opening and closing the second inlet by fluid pressure. And a second outlet provided in the main body, and the first leaf valve is provided between the first valve device and the second valve device. And a third valve seat body for supporting the spring while opening and closing between the second valve device and the second valve device. And an annular groove is provided in an end surface portion of the third valve seat body on the side of the first leaf valve, and an annular elastic seal ring partially protruding from the end surface portion is provided in the groove. Since the push-in operation eliminates the need for expensive power elements such as bellows, which are easily broken, an inexpensive and highly reliable small fluid control valve having a simple structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a fluid control valve and refrigeration system mounting view in an embodiment of the present invention, and FIG. 2 is a conventional fluid control valve cross-sectional view and refrigeration system mounting view. 6 ... First valve device, 7 ... Second valve device, 8 ... Main body, 9 ... Third valve device, 10 ... First inlet, 11 ... First outlet, 12 ... … First valve seat body, 13 …… First leaf valve, 14 …… Spring, 15 …… Second valve seat body, 16 ……
2nd inlet, 17 ... 2nd leaf valve, 18 ... 2nd outlet, 20 ... communication hole, 22 ... 3rd valve seat body, 23 ... annular groove, 24 ... elastic seal ring .

Claims (1)

(57) [Claims] 1. A first valve device and a second valve device are provided in a main body formed in a cylindrical shape, and the first valve device has a first inlet and a first outlet. A first valve seat, a first leaf valve for simultaneously opening and closing the first inlet and the first outlet of the first valve seat by fluid pressure, and the first leaf valve The second valve device includes a second valve seat body having a second inlet, and a second valve seat body that opens and closes the second inlet by fluid pressure. A leaf valve and a second outlet provided in the main body, wherein the first valve device is provided between the first valve device and the second valve device, and the first valve device is provided between the first valve device and the second valve device. The second
Configuring a third valve device having a third valve seat body that opens and closes the valve device and supports the spring, and an end face portion of the third valve seat body on the first leaf valve side. A fluid control valve in which an annular groove is provided in the groove, and an annular elastic seal ring partially protruding from the end surface portion is inserted into the groove.