JPS6039716Y2 - refrigeration cycle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a refrigeration cycle, and more particularly to a variable capacity refrigeration cycle that can adjust the refrigeration capacity.

Conventionally, in a variable capacity refrigeration cycle, as shown in FIG. Connected by the release pipe 13 provided,
It is known that the compressed refrigeration discharge capacity to the condenser 14 is controlled by opening and closing the control valve 12.

Reference numeral 15 is a capillary tube, and 16 is an evaporator.

In such a conventional refrigeration cycle, the control valve 12
When the valve is closed and full power operation is performed, the volume inside the release pipe 3a between the release port and the control valve 12 becomes wasted, and the refrigerant gas that is being compressed enters and exits the release pipe 3a by that volume. , compression efficiency decreases.

For this reason, there is a drawback that the energy consumption efficiency during full power operation is significantly lower than that of a normal type compressor that does not have a release port.

The present invention was made in view of these points, and the purpose is to provide a variable capacity refrigeration cycle that does not reduce energy consumption efficiency during full power operation, has a simple structure, and is inexpensive. .

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a circuit diagram showing an example of a refrigeration cycle according to the present invention.

The compressor 11 has a release port (
(not shown) is drilled, and this release port and the compressor 1
1 is connected to the suction side by a release pipe 13 in which an on/off control valve 12 is disposed.

Further, the release 't 13 a between the release port and the on/off control valve 12 is connected to the discharge side of the compressor 11 via a resistance flow path, for example, a capillary tube 17 .

Reference numeral 14 is a condenser, 15 is a capillary tube, and 16 is an evaporator.

Next, the operation and effects of this embodiment having such a configuration will be explained.

First, when performing power save operation, the control valve 12 is opened to release the refrigerant gas that is being compressed from the compressor 11 to the suction side, thereby reducing the discharge capacity from the compressor 11.

Next, when performing full power operation, the control valve 12 is closed and all compressed refrigerant gas is discharged to the condenser 14 side.

In this case, the release pipe 13a between the release port and the control valve 12 is filled with high-pressure refrigerant gas supplied from the discharge side of the compressor 11 via the capillary tube 17. The cylinder is closed by high-pressure refrigerant gas, and the refrigerant gas in the cylinder during compression does not flow out into the release pipe 3a.

Therefore, a decrease in the compression efficiency of the compressor 11 is prevented,
Unlike conventional methods, energy consumption efficiency does not deteriorate.

FIG. 3 is a circuit diagram showing another embodiment of the present invention.

In this embodiment, the release pipe 13 between the release port and the control valve 12 is further connected to a resistance flow passage, for example, a relief pipe 19 in which a capillary tube 18 is disposed.

The other end of the relief pipe 19 is connected to a pipe between the suction side of the compressor 11 and the evaporator 16.

By providing the relief pipe 19 in this manner, high-pressure refrigerant from the discharge side of the compressor 11 is prevented from being injected into the cylinder through the release port during full power operation, and the input to the compressor 11 is prevented. uploading is prevented.

As described above, according to the present invention, with a simple structure, it is possible to easily prevent the compression efficiency of the compressor from decreasing during full power operation, and it is possible to maintain the energy consumption efficiency of the variable capacity refrigeration cycle. .

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram showing a conventional variable capacity refrigeration cycle, Fig. 2 is a refrigerant circuit diagram showing a variable capacity refrigeration cycle according to the present invention, and Fig. 3 is a refrigerant circuit diagram showing another embodiment of the present invention. be. 11...Compressor, 12...On/off control valve, 13...Release pipe, 13a...
... Release tube between the release port and the on/off control valve, 17... Capillary tube.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ In a variable capacity refrigeration cycle in which a release port opening into the cylinder of a compressor and the suction side of the compressor are connected by a release pipe equipped with an on/off control valve,
A refrigeration cycle characterized in that a release pipe between the release port and the on/off control valve is connected to a compressor discharge side via a resistance flow passage. 2. The refrigeration cycle according to claim 1, wherein the resistance flow path is a capillary tube.