JPH02197770A - Fluid control valve - Google Patents

Abstract

PURPOSE:To simplify structure and to improve reliability by a method wherein a valve seat body of specified constitution and a third valve device are mounted between first and second valve devices. CONSTITUTION:Since, during running of a rotary compressor 2, a circuit 1 forms a high pressure circuit and a circuit B forms a low pressure circuit, a leaf valve 14 of a first valve device 6 opens a valve seat body 13 against the energizing force of a spring 15 and brought into contact with a valve seat body 23 having an opening part 22 of a third valve device 9, and refrigerant on the high pressure side is caused to flow to the low pressure side. A leaf valve 19 of a second valve device 7 makes contact with a stopper 20. When the rotary compressor 2 is stopped, high pressure gas reversely flows from the suction side of the compressor 2 and flows in a body 8 through a refrigerant outflow pipe 21, but the leaf valve 19 of a second valve device 7 closes a valve seat body 18 by means of a reverse pressure. Meanwhile, a leaf valve 14 making contact with the valve seat body 23 of the third valve device 9 is pushed upward and forced into contact with the valve seat body 13 of the first valve device 6 to close it.

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. High-pressure gas flows into the cabinet l) − from the condenser, which is the high-pressure side.
Since the heat flows into the evaporator through F, there is a problem in that when restarting operation, there is a large heat load on the evaporator, which inevitably increases power consumption.

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 Due to the presence of elements, they are inevitably large in size, require strict assembly precision, and take 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.

A conventional fluid control valve is known, for example, from Japanese Utility Model Publication No. 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, 2
9 is a capillary tube, and 30 is an evaporator.

The fluid control valve 26 is a first valve device 3 interposed in the high pressure circuit A between the condenser 28 and the capillary tube 30.
1 and a second valve arrangement 32 interposed in the low-pressure circuit B between the evaporator 30 and the rotary compressor 2. It is formed in the casing 34, and the fluid control valve 26 is constructed by integrally combining both casings 33 and 34. 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 35 made of bellows. The valve device 31 has a refrigerant inlet vibrator 36 and a refrigerant outlet vibrator 37.
It is composed of a valve seat body 38 formed in between, and a valve 39 that opens and closes this valve seat body 38. The lower end of this valve 39 is fitted into the recess 4o of the power element 36, and the power element 35 senses the pressure difference between the high voltage circuit A1 and the low voltage circuit B, the expansion and contraction force of the power element 36 itself, and the power element 36. The valve seat body 38 is opened and closed by the pressure adjustment spring 41 that adjusts the expansion and contraction force of the valve seat body 38. Further, the second valve device 32 includes a valve seat body 46 formed on a connecting pipe 44 having a refrigerant inlet vibe 43 fixed to one open end 42 of the lower casing 34, and a valve seat body 46 that opens and closes this valve seat body 44 by fluid pressure. It is composed of a leaf valve 46.

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 screwed into a threaded portion 49 inside the lower open end of the upper casing 33.

60 is a ring, which connects the upper casing 33 and the lower casing 34 to the opening stepped portion 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 2e, when the rotary compressor 27 is operating, the high pressure circuit A naturally becomes high pressure and the low pressure circuit B becomes low pressure, so the power element 36 compensates for this pressure difference. Sensing, spring 4
1, the valve 39 opens the valve seat body 38,
Further, the leaf valve 46 is also lifted by the refrigerant pressure from the refrigerant inlet vibe 43 and comes into contact with the stopper surface 53 of the adjustment member 48 . Thus, the refrigerant flows from the rotary compressor 27 to the condenser 28 to the first valve device 31 to the capillary tube 29 to the evaporator 30 to the second valve device 32 to the rotary compressor 27 to perform a normal refrigeration action. When the rotary compressor 27 stops, high-pressure gas flows backward from the suction side of the compressor 27 and flows into the fluid control valve 26 from the refrigerant outlet vibe 47, but the leaf valve 4
6 closes the valve seat body 46 by this reverse pressure, while the power element 35 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 3.
8 is closed. Tsume υ high voltage circuit A.

Both low voltage circuit B and 1. The second valve device 31,32 is closed and prevents superheated gas from flowing into the evaporator 30.

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. Because of this, the power element is subjected to large pressure υ
If it is deformed or destroyed, it has the disadvantage that the refrigeration cycle will 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 objects, the fluid control valve of the present invention has a first valve device and a second valve device in a cylindrical main body, and has a first valve device and a second valve device. The first valve device consists of a valve seat body, a leaf valve that opens and closes this valve seat body by fluid pressure, and a spring that biases the opening and closing force of this leaf valve body. and a leaf valve that opens and closes the valve seat body by fluid pressure, and a leaf valve that is crimped on the main body to form a stopper surface when the leaf pulp is opened, and between the first valve device and the second valve device. , @3 having a valve seat body having an opening that opens and closes using leaf pulp in the first valve device, and a seat body that supports a spring.
It is constructed by providing a valve device.

According to this configuration, the third valve device is provided between the first valve device and the second valve device, and the opening to be opened and closed is opened and closed by the leaf valve of the first valve device, and the high and low pressure circuit is opened and closed. Since the parts are isolated, the structure has fewer parts.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a refrigeration cycle using the fluid control valve of the present invention.

1 is a fluid control valve, 2 is a rotary compressor, 3 is a condenser, 4 is a capillary tube, and 6 is a spontaneous 2g.

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 4, and a second valve device interposed in a low pressure circuit B between an evaporator 5 and a rotary compressor 2. The first and second valve devices 6, 7 having a valve device 7 are formed in a cylindrical main body (hereinafter referred to as main body) 8, and are divided into upper and lower parts by a valve device 9 @3. has been done.

The first valve device 6 is attached to one end surface of the main body by welding at a seat portion of 1°, and includes a valve seat body 13 formed between a refrigerant inlet vibrator 11 and a refrigerant outlet vibrator 12 on the high pressure side, and It is composed of a leaf valve 14 that opens and closes the seat body 13.

The other end of this leaf pulp 14 is pressed against the valve seat body 13 by one end of a spring 16.

The second valve mounting mold is attached to the other end surface of the main body 8 by welding at the seat portion 16, and connects the valve seat body 18 to which the refrigerant inlet vibe 1a on the low pressure side is connected, and this valve seat body 18 with fluid. In order to prevent excessive movement of the leaf pulp 19 and the leaf valve 19 inside the main body 8, which opens and closes under pressure, a lip is provided by roll caulking as a stopper 20, and a refrigerant outlet vibrator 21 on the low pressure side is installed above the stopper 20. It is configured by connecting.

1, the third valve device 9 is provided in the main body 8 between the first valve device 6 and the second valve device 7, and is opposed to the leaf pulp 14 which is a component of the first valve device 6. Opening 2 in the position
2 and the valve seat body 1 of the first valve device 6
3. The leaf valve 14 is composed of a seat body 23 that supports the other end of the spring 16, is held in a recess 24 of the seat body 23, and is fixed by a roll caulking 26 of the main body 8.

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

When rotary compressor 2 is operating, the high pressure circuit A
Since B is a high voltage circuit and low voltage circuit B is a low voltage circuit, the first
The leaf valve 14 of the third valve device 9 senses this pressure difference, overcomes the biasing force of the spring 16, opens the valve seat body 13, and opens the valve seat body 23 having the opening 22 of the third valve device 9.
to prevent refrigerant from the high pressure side from flowing into the low pressure side.

Further, the leaf pulp valve 19 of the second valve device 7 is also lifted by the refrigerant pressure from the refrigerant inlet vibrator 17 on the low-pressure side, and comes into contact with the stopper 2o formed by the rib of the loaf caulking of the main body 8.

And the refrigerant is transferred from rotary compressor 2 to condenser 3-
First valve device 6 - Cabinet reach 4 - Evaporator 5 -
The second valve arrangement 7 - flows with the rotary compressor 2 and performs the 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 main body 8 from the refrigerant outlet vibe 21 on the low-pressure side.
The glue 7 pulp 19 closes the valve seat body 18 by this counter pressure.

On the other hand, the leaf pulp 14 that is in contact with the valve seat body 23 of the third valve device 9 is pushed up and brought into contact with the valve seat body 13 of the first valve device 6, thereby closing the valve.

As described above, according to this embodiment, the main body formed on the cylinder has the first valve device and the second valve device, and the first valve device has the first valve device and the second valve device.
The second valve device includes a valve seat body, a leaf pulp that opens and closes the valve seat body by fluid pressure, and a spring that biases the opening and closing force of the leaf pulp. and a leaf pulp that opens and closes this valve seat body by fluid pressure, and a stopper surface when the leaf pulp is opened by caulking on the main body, and between the first valve device and the second valve device, By providing a valve seat body having an opening that is opened and closed by leaf pulp in the first valve device and a third valve device having a seat body that supports a spring, a highly reliable structure can be achieved easily. A small valve can be obtained.

Effects of the Invention As described above, the present invention has a main body formed on a cylinder.
and a second valve device, and the first valve device includes a valve seat body, a leaf pulp that opens and closes the valve seat body by fluid pressure, and an opening/closing force of the leaf pulp that is energized. The second valve device includes a valve seat body, a leaf pulp that opens and closes the valve seat body by fluid pressure, and a stopper surface when the leaf pulp valve is opened by roll caulking on the main body. Between the first valve device and the second valve device, there is provided a valve seat body having an opening that is opened and closed by a leaf pulp valve in the first valve device, and a third seat body that supports a spring. By providing this valve device, a highly reliable valve with a simple structure and low cost can be obtained.

In addition, since it is formed inside a cylindrical body and is small, it does not require a large space even when installed near the compressor of a refrigerator, and its practical effects are very large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the fluid control valve of the present invention and an installation diagram of the refrigeration system, and FIG. 2 is a sectional view of the conventional fluid control valve and an installation diagram of the refrigeration system. 6...First valve device, 7...Second valve device, 8...Main body, 9...Third valve device, 13. ...Valve seat body (first valve device), 14.
Old... Leaf Pulp (first valve device), 16...
・Spring, 18... Group ・Valve seat body (second valve device),
19...Leaf pulp (second valve device), 2o
...Stopper, 23...Valve seat body. Name of agent: Patent attorney Shigetaka Awano and 1 other person lol!
2 figures

Claims (1)

[Claims] A main body formed on a cylinder has a first valve device and a second valve device, and the first valve device includes a valve seat body and a leaf valve that opens and closes the valve seat body by fluid pressure. , and a spring that biases the opening and closing force of the leaf valve, and the second valve device includes a valve seat body, a leaf valve that opens and closes the valve seat body by fluid pressure, and a spring that is crimped onto the main body. It constitutes a stopper when the leaf valve is opened,
Between the first valve device and the second valve device, there is a third valve seat body having an opening that is opened and closed by the leaf valve in the first valve device, and a seat body that supports a spring. A fluid control valve comprising a valve device.