JP2002243311A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner wherein a refrigerant sound is prevented upon cooling operation from occurring on balancing capillary tubes provided respectively on an outflow side of an outdoor heat exchanger in cooling operation having a plurality of paths. SOLUTION: An air conditioner is adapted such that there are connected through pipes in order a compressor 1, a four way valve 2, an outdoor heat exchanger 3 including a plurality of paths 3a to 3d, an expansion valve 4, an indoor heat exchanger 5, and balancing capillary tubes 6 provided respectively on an outflow side of the plurality of paths 3a to 3d in cooling operation, and a refrigerant R407C, where three kinds of refrigerants each having different condensation points are mixed, is filled as a refrigerant. In the air conditioner, there are connected a bypass pipe 7 including a check valve 8 between the outflow side of the foregoing plurality of the paths 3a to 3d in cooling operation and the foregoing expansion valve 4. The check valve 8 bypasses the capillary tube 6 and has a forward direction from the plurality of the paths 3a to 3d to the foregoing expansion valve 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air conditioner, and more particularly, to a refrigeration cycle.

[0002]

2. Description of the Related Art As shown in FIG. 2, for example, a conventional air conditioner includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3 having a plurality of paths 3a to 3d, and an expansion valve 4. , Indoor heat exchanger 5
And a plurality of balancing capillary tubes 6 provided on the outflow side of the plurality of paths 3a to 3d during the cooling operation, respectively, in sequence, so that a three-type mixed refrigerant R having a different condensation point as a refrigerant.
407C was filled.

[0003] However, the refrigerant has three types of refrigerants having different boiling points (R32, R125 and R124).
a) is mixed, and during the cooling operation, after passing through the plurality of paths 3a to 3d, the refrigerant becomes a refrigerant in which a gas phase and a liquid phase are mixed. There is a problem that refrigerant noise is generated as the air passes.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has been made in consideration of the above-mentioned problems, and in the cooling operation, the refrigerant noise is generated by the balance capillary tubes provided on the outlet side of the outdoor heat exchanger having a plurality of paths. It is an object of the present invention to provide an air conditioner that is prevented from occurring.

[0005]

In order to solve the above-mentioned problems, the present invention provides a compressor, a four-way valve, an outdoor heat exchanger having a plurality of paths, an expansion valve, an indoor heat exchanger, In the air conditioner, which is sequentially connected to a balance capillary tube provided on the outflow side of the plurality of paths during the cooling operation and is filled with a triple-mixed refrigerant R407C having a different condensation point as a refrigerant, The bypass pipes that respectively bypass the capillary tubes are connected between the outflow side of the path during the cooling operation and the expansion valve.

In addition, the bypass pipes are configured such that they merge after bypassing the capillary tubes, respectively, and that a check valve is provided in the forward direction from the junction to the expansion valve.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as examples. FIG. 1 is a diagram showing a refrigeration cycle of an air conditioner according to the present invention.

As shown in the figure, the basic configuration of the air conditioner according to the present invention is similar to that of the above-described prior art, and includes a compressor 1, a four-way valve 2, and a plurality of paths 3a to 3d. An outdoor heat exchanger 3 provided, an expansion valve 4, an indoor heat exchanger 5,
The plurality of paths 3a to 3d are sequentially piped to the balance capillary tubes 6 provided on the outflow side during the cooling operation, and three types of refrigerants (R3
2, R125 and R124a) are filled with a three-component mixed refrigerant R407C, and during the cooling operation, the refrigerant circulates as indicated by solid-line arrows,
During the heating operation, the refrigerant circulates as indicated by a dashed arrow.

The capillary tubes 6 are respectively bypassed between the outflow sides of the plurality of paths 3a to 3d during the cooling operation and the expansion valve 4, and are merged after the bypass. A bypass pipe 7 having a check valve 8 which is directed forward from the section toward the expansion valve 4 is connected.

Thus, during the cooling operation, when the refrigerant passes through the plurality of paths 3a to 3d and the gas phase and the liquid phase are mixed, the refrigerant can be bypassed by the bypass pipe 7. The refrigerant sound generated when the liquid and the liquid phase are mixed and flow into the capillary tube 6 is as follows:
This does not occur because the bypass pipe 7 is provided.

The bypass pipe 7 is provided with a single check valve 8 which is directed forward from the junction to the expansion valve 4 during a cooling operation. There is no need to provide a plurality of check valves for bypassing the tubes 6 respectively, which is advantageous in cost.

In the heating operation, the check valve 8 moves in the opposite direction, so that the refrigerant circulates as indicated by the dashed arrow in FIG.
After that, it circulates from the outdoor heat exchanger 3 having a plurality of paths 3a to 3d to the four-way valve 2.

[0013]

As described above, according to the present invention,
The air conditioner is configured such that refrigerant noise is prevented from being generated by the balancing capillary tubes provided on the outflow side of the outdoor heat exchanger having a plurality of paths during the cooling operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a refrigeration cycle of an air conditioner according to the present invention.

FIG. 2 is a diagram showing a refrigeration cycle of an air conditioner according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 3a-3d Multiple passes 4 Expansion valve 5 Indoor heat exchanger 6 Capillary tube 7 Bypass pipe 8 Check valve

Claims (2)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger having a plurality of paths, an expansion valve, an indoor heat exchanger, and an outlet side of the plurality of paths during a cooling operation, respectively. In the air conditioner, which is sequentially connected to a balanced capillary tube and filled with a three-component mixed refrigerant R407C having a different condensation point as a refrigerant, the outflow side during the cooling operation of the plurality of paths, and the expansion valve An air conditioner, characterized in that bypass pipes for respectively bypassing the capillary tubes are connected therebetween. 2. The bypass pipe according to claim 1, further comprising a check valve that joins after bypassing each of the capillary tubes and that is forwardly directed from the junction to the expansion valve. 2. The air conditioner according to 1.