JPH06331240A - Circuit for refrigerant - Google Patents

Abstract

PURPOSE:To make element parts small and simple, and to decrease brazing places therefor, by a method wherein a strainer with a built-in strainer mesh is integrated with a main body for a check valve with a built-in valve body. CONSTITUTION:A strainer S consists of a cylindrical main body 30 and a strainer mesh 31, which is fixed at the inside thereof, and one end of the main body 30 each are joined to a refrigerant pipe-line 33 by brazing 32. A check valve C consists of a cylindrical main body 20, a valve body 21, which is reciprocatively movably fitted at the inside of the main body 20 along an axial line, a valve seat 22 on which the valve body 21 is seated, and a stopper 23, by which the valve body 21 is kept from moving. The valve seat 22 and the stopper 23 are fixed to the inside of a main body 20 at a regular interval between them, and one end of the main body 20 is connected to the refrigerant pipe-line 33 by brazing 24. In this way, since one end of the main body 39 for the strainer S is fixed to one end of the main body 20 for the check valve C by brazing 32 and they are integrated with each other, brazing parts can be decreased and the leakage of a refrigerant can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant circuit for an air conditioner or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a refrigerant circuit of a conventional air conditioner. During the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 of the outdoor unit O has a four-way valve 2, a strainer 3A, a pipe joint 4A, an inside / outside connecting gas pipe 5, and a pipe joint 4B as indicated by solid arrows. After entering the indoor unit I,
After passing through the strainer 3B, it flows into the heat exchanger 6 on the use side, where it radiates heat to indoor air to be condensed and liquefied to become a high-pressure liquid refrigerant.

This liquid refrigerant is adiabatically expanded to become a low-pressure liquid gas two-phase refrigerant by being narrowed down by the capillary tube 7. Heat source side heat exchanger 14 via check valve 12
Then, it absorbs heat from the outside air and evaporates to become a low-pressure gas refrigerant. Then, this gas refrigerant is sucked into the compressor 1 through the four-way valve 2 and the accumulator 18.

During the cooling operation, the gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and is condensed in the heat source side heat exchanger 14 to become a high-pressure liquid refrigerant as shown by the broken line arrow, and is condensed in the capillary tube 13. By being squeezed, it becomes a low pressure liquid gas two-phase refrigerant. And this liquid gas two-phase refrigerant is a strainer
3D, pipe joint 4D, internal / external connecting liquid pipe 9, pipe joint 4C, strainer
After passing through 3C and the check valve 8, it is evaporated in the heat exchanger 6 on the utilization side to become a low-pressure gas refrigerant. This gas refrigerant is strainer 3B, pipe joint
4B, gas pipe 5 for connecting inside and outside, pipe joint 4A, strainer 3A, four-way valve 2, accumulator 18, and then return to the compressor 1.

Details of the strainers 3C and 3D and the check valves 8 and 12 are shown in FIG. Strainers 3C and 3D are cylindrical body 30
And a strainer mesh 31 fixed inside this, and both ends of the main body 30 are joined to the refrigerant pipe 33 by brazing 32.

The check valves 8 and 12 include a cylindrical main body 20, a valve body 21 fitted therein so as to be reciprocally movable in the axial direction, a valve seat 22 on which the valve body 21 is seated, and a valve. It comprises a stopper 23 for stopping the movement of the body 21. The valve seat 22 and the stopper 23 are fixed to the inner surface of the main body 20 with a space therebetween, and both ends of the main body 20 are joined to the refrigerant pipe 33 by brazing 24.

When the refrigerant flows from the left to the right as shown by the arrow, the refrigerant flows into the main body 30 of the strainers 3C and 3D, and the foreign matter contained in the refrigerant in the process of passing through the strainer mesh 31. Are captured and removed. Strainer 3C, 3D
The refrigerant flowing out of the refrigerant flows through the refrigerant pipe 33 into the main body 20 of the check valves 8 and 12, and pushes the valve body 21 to the right to disengage it from the valve seat 22 and contact the stopper 23. Let
Then, it passes through the gap between the valve body 21 and the valve seat 22 and flows out into the refrigerant pipe 33 around the valve body 21 and through the passage 25 formed therein and the opening 26 and the notch hole 27 formed in the stopper 23. .

When the refrigerant flows from the right to the left into the main body 20 of the check valves 8 and 12, the refrigerant pushes the valve body 21 to seat it on the valve seat 22.

[0009]

In the conventional refrigerant circuit described above, since the strainers 3C and 3D and the check valves 8 and 12 are joined to the refrigerant pipe 33 by brazing 32 and 24, respectively, the number of brazing steps is increased. However, there is a problem in that the risk of leakage of the refrigerant gas from the brazing parts 32 and 24 increases and the installation space for the strainer and the check valve is large.

[0010]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned problems, and its gist is to provide a strainer including a strainer mesh and a check valve including a valve body. In a refrigerant circuit which is interposed in series, the main body of the strainer and the main body of the check valve are integrated with each other.

The strainer main body may be provided with a connection port for a pipe connected in parallel with the check valve.

[0012]

In the present invention, since it has the above-mentioned structure, the structure is small and simple, and the number of brazing points is small, so that it can be manufactured at low cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the invention is shown in FIG. In this first embodiment, the body of the strainer S
The strainer S and the check valve C are integrated by brazing 32 one end of the body 30 to one end of the main body 20 of the check valve C. Other configurations are similar to those of the conventional one shown in FIG. 5, and corresponding members are designated by the same reference numerals.

Since there is no refrigerant pipe between the strainer S and the check valve C as in the conventional case, the structure is simplified and the distance between the strainer S and the check valve C is shortened. Therefore, the installation space for these is reduced. And since there are fewer brazing points than conventional ones,
The labor and cost required for brazing can be reduced, and the risk of refrigerant leaking from the brazing location is reduced.

FIG. 2 shows a second embodiment of the present invention. In this second embodiment, the body of the strainer S and the body of the check valve C are formed by a single piece 40.
The other structure is the same as that of the first embodiment shown in FIG.

FIG. 3 shows a third embodiment of the present invention. In the third embodiment, the strainer S main body 30 is provided with a connection port 42 for a pipe 41 such as a capillary tube connected in parallel with the check valve C, and the main body 30 and the pipe 41 are brazed 43 to each other. It is joined. The other structure is the same as that of the first embodiment shown in FIG.

In the third embodiment, not only the strainer S, the check valve C and the pipe 41 can be easily incorporated into the refrigerant circuit, but also the installation space for them can be reduced.

[0018]

In the present invention, since the main body of the strainer and the main body of the check valve are integrated, these structures are small,
Since it is simplified and there are few brazing points, it can be manufactured at low cost.

If the main body of the strainer is provided with a connection port for the pipe connected in parallel with the check valve, not only the strainer, the check valve and the pipe can be easily incorporated into the refrigerant circuit, but also the installation space for them Also becomes smaller.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a main part showing a third embodiment of the present invention.

FIG. 4 is a refrigerant circuit diagram of a conventional air conditioner.

FIG. 5 is a partial vertical cross-sectional view of the refrigerant circuit.

[Explanation of symbols]

 S strainer 30 body 31 strainer mesh C check valve 20 body 21 valve body

[Procedure amendment]

[Submission date] October 14, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 4

[Correction method] Added

[Correction content]

[Figure 4]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Added

[Correction content]

[Figure 5]

Claims (2)

[Claims] 1. A refrigerant circuit comprising a strainer containing a strainer mesh and a check valve containing a valve body in series, wherein a body of the strainer and a body of the check valve are integrated. Refrigerant circuit. 2. The refrigerant circuit according to claim 1, wherein the strainer main body is provided with a connection port for a pipe connected in parallel with the check valve.