JPH07269989A - Check valve device of refrigerating cycle - Google Patents

Abstract

PURPOSE:To enable some foreign material to be prevented from being accumulated at an opening edge of a valve seat opposite to a valve disc even in the case that refrigerant easily generating some foreign material is applied, to keep a superior flow passage for refrigerant and to maintain a superior cooling performance. CONSTITUTION:An opening edge 22a of a valve seat 22 opposite to a valve disc 24 is formed to be a narrow ended taper part so as to eliminate a disturbance of flow of the refrigerant at the part of the opening edge 22a at the valve seat 22 opposite to the valve member 24 which is a cause of deposition of some foreign material, resulting in that a smooth flow of the refrigerant is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve device for a refrigeration cycle, which is suitable as an alternative CFC specification.

[0002]

2. Description of the Related Art Conventionally, fluorocarbons such as R-12 have been used as a refrigerant for a refrigerating cycle of a refrigerator, for example. However, in recent years, it has been pointed out that when this type of CFC gas is released into the atmosphere, it adversely affects the ozone layer in the stratosphere, and there is a demand to stop the use of CFCs. Therefore, instead of the conventional Freon, R-13
It has been considered to use so-called alternative CFCs such as 4a.

[0003]

According to experiments and research conducted by the present inventors, when an alternative CFC such as R-134a is used as the refrigerant, rust preventive oil, processing oil, cleaning agent, etc. in the compressor oil are not produced. It has been found that a chemical reaction occurs, and further, dust in the refrigeration cycle, molecular sieve powder, metal powder, etc. undergo a chemical reaction, and a foreign substance (for example, a metal salt of carboxylic acid) usually called contamination is easily generated. Then, it was found that in the check valve device portion shown in FIG. 4 of the refrigeration cycle, as shown by the foreign matter C, it is likely to deposit on the opening edge portion of the valve seat 1 on the side opposite to the valve body 2.

In the above-mentioned check valve device, the valve body 2 is separated from the valve seat 1 by the flow of the refrigerant shown by the arrow in the figure from the evaporator side of the refrigeration cycle to the compressor direction to allow the flow of the refrigerant. , The valve body 2 by the flow of the refrigerant in the opposite direction
Is in contact with the valve seat 1 to block the flow of the refrigerant.

Thus, the foreign matter C deposited as described above
When used for a long period of time, it gradually accumulates and narrows the flow path of the refrigerant, resulting in deterioration of cooling performance. In the worst case, it may even block the flow path of the refrigerant.

The present invention has been made in view of the above circumstances. Therefore, an object of the present invention is to provide a refrigerant at the opening edge portion of the valve seat on the side opposite to the valve body even when a refrigerant that easily produces foreign substances is used. It is an object of the present invention to provide a check valve device for a refrigeration cycle, which can ensure a favorable flow path.

[0007]

In order to achieve the above object, in a check valve device for a refrigeration cycle of the present invention, a valve seat provided inside a pipe between an evaporator and a compressor of the refrigeration cycle is provided. A valve element that separates from the evaporator side of the refrigeration cycle by the flow of the refrigerant in the direction of the compressor with respect to the valve seat, allows the flow of the refrigerant, and contacts the flow of the refrigerant in the opposite direction to prevent the flow of the refrigerant. And the opening edge of the valve seat on the side opposite to the valve body is formed in a tapered shape.

[0008]

According to a further study by the present inventor, in the check valve device portion of the refrigeration cycle, foreign matter is likely to be deposited at the opening edge portion of the valve seat on the side opposite to the valve body, because that portion has a large refrigerant flow passage. It has been found that this is because there is a step and the flow of the refrigerant is disturbed as shown by the arrow in FIG.

Therefore, by forming the opening edge portion of the valve seat on the side opposite to the valve body in a taper shape which is divergent, it is possible to eliminate the step at that portion, to allow the refrigerant to flow smoothly and to prevent the precipitation of foreign matter. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a check valve device for a refrigerator refrigeration cycle will be described below with reference to FIGS. First, FIGS. 2 and 3 show the entire structure of a refrigeration cycle for a refrigerator. From a compressor 11, an evaporation pipe 12 for evaporating defrost water, a heat radiating pipe 13 which is a main condenser, and a dewproof clean pipe 14 are shown. , Dryer 15, differential pressure valve 16, capillary tube 17, evaporator 18, accumulator 19, check valve 20, and compressor 11 in a closed loop. Further, the pressure of the refrigerant on the suction side of the compressor 11 is introduced into the differential pressure valve 16.

In the refrigerating cycle, a CFC alternative, such as R-134a, which does not adversely affect the ozone layer, is enclosed as a refrigerant. The refrigerant is compressed by the compressor 11, and the evaporation pipe 12 and the heat radiating pipe are compressed. 13, liquefy heat with the clean pipe 14, remove water with the dryer 20,
The refrigerator tube is cooled by repeating the process of sending heat from the ambient air by sending it from the capillary tube 17 to the evaporator 18, vaporizing it in the evaporator 18, and then returning it to the compressor 11 through the accumulator 19. It has become.

When the compressor 11 is operated as described above, the pressure difference on the outlet side of the clean pipe 14 which is the final stage condenser becomes higher than the pressure on the suction side of the compressor 11, so that the pressure difference between the pressure difference valve 16 and the pressure difference valve 16 is increased. The opening operation is performed by the pressure to make the clean pipe 14 and the capillary tube 17 communicate with each other,
When the compressor 11 is stopped, the refrigerant in the clean pipe 14, the heat radiation pipe 13 and the evaporation pipe 12 flows back to the compressor 11, and the pressure on the suction side of the compressor 11 becomes equal to the pressure on the outlet side of the clean pipe 14. Thus, the closing operation is performed and the clean pipe 14 and the capillary tube 17 are shut off from each other. Further, at this time, the check valve 20 functions to prevent the reverse flow of the refrigerant from the compressor 11 to the evaporator 18.

Here, FIG. 1 shows the structure of the check valve 20 in the refrigeration cycle in detail, in the middle of the pipe 21 from the accumulator 19 to the compressor 11.
The valve seat 22 is fixed and internally provided by the first drawn portion 23 of the pipe 21. The pipe 2 faces the valve seat 22.
A valve body 24 having a tapered end 24a is inserted into the inside of the valve 1. The range of movement of the valve body 24 toward the side opposite to the valve seat 22 is restricted by the second drawing portion 25 of the pipe 21. I am trying.

With this structure, the valve body 24 is separated from the valve seat 22 by the flow of the refrigerant indicated by the arrow in the figure from the evaporator 18 side of the refrigeration cycle toward the compressor 11 to allow the flow of the refrigerant, and the opposite direction. The flow of the refrigerant into the valve seat 22 prevents the flow of the refrigerant. Then, the opening edge 22a of the valve seat 22 on the side opposite to the valve body 24 is formed in a taper shape which is divergent, and the angle is particularly set to 20 degrees or less.

The refrigerant used in the refrigeration cycle is R-
In the case of using an alternative CFC such as 134a, a foreign substance that is usually called a contaminant is generated, and in the check valve 20 portion, it is likely to deposit on the opening edge portion 22a of the valve seat 22 on the side opposite to the valve body 24. Is as described above.

According to the research conducted by the present inventor, it has been found that the above-mentioned foreign matter is likely to be deposited because the above-mentioned portion becomes a large step in the refrigerant flow path and the flow of the refrigerant is disturbed. ing. In that respect, in the above-mentioned configuration,
The opening edge 22a of the valve seat 22 on the side opposite to the valve body 24 is formed in a taper shape which is divergent, so that the step at that portion can be eliminated and the refrigerant can flow smoothly, so that the precipitation of foreign matter is eliminated. You can Therefore, it is possible to maintain good cooling performance, and it is possible to avoid the worst situation in which foreign matter blocks the refrigerant flow passage.

The present invention can be similarly applied to and implemented in a refrigeration cycle such as a freezer showcase or an air conditioner other than the refrigerator. Further, the taper angle of the opening edge 22a of the valve seat 22 on the side opposite to the valve body 24 is not limited to the above.

[0018]

As is apparent from the above description, the check valve device for a refrigeration cycle according to the present invention includes a valve seat provided in a pipe line between the evaporator and the compressor of the refrigeration cycle,
A valve element that separates from the evaporator side of the refrigeration cycle by the flow of the refrigerant in the direction of the compressor to the valve seat, allows the flow of the refrigerant, and contacts with the flow of the refrigerant in the opposite direction to prevent the flow of the refrigerant; In the case of using a refrigerant that easily produces foreign matter, the opening edge of the valve seat on the side opposite to the valve body is formed in a tapered shape. However, it is possible to prevent foreign matters from being deposited on the opening edge portion of the valve seat on the side opposite to the valve body, to ensure a good flow path for the refrigerant, and to maintain excellent cooling performance.

[Brief description of drawings]

FIG. 1 is a sectional view of a main portion showing an embodiment of the present invention.

FIG. 2 is a three-dimensional configuration diagram of the entire refrigeration cycle

FIG. 3 is a schematic configuration diagram of the entire refrigeration cycle.

FIG. 4 is a view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

Reference numeral 11 is a compressor, 18 is an evaporator, 20 is a check valve, 21 is a pipe, 22 is a valve seat, 22a is an opening edge of the valve seat on the side opposite to the valve body, and 24 is a valve body.

Claims (1)

[Claims] 1. A valve seat provided inside a pipe between an evaporator and a compressor of a refrigeration cycle, and a valve seat separated from the valve seat by a flow of a refrigerant from a side of the evaporator of the refrigeration cycle toward a compressor. A valve body that allows the flow of the refrigerant and contacts with the flow of the refrigerant in the opposite direction to block the flow of the refrigerant, wherein the opening edge portion of the valve seat on the side opposite to the valve body is widened. A check valve device for a refrigeration cycle, characterized in that the check valve device is formed in a tapered shape.