JPH08313067A - Refrigerating apparatus - Google Patents

Abstract

PURPOSE: To complete bypassing in a short time while lowering noises during the bypassing of a high pressure refrigerant with a bypass pipeline by connecting a connection part on the outlet side of the bypass pipeline in the course of the piping of a compressor from a liquid separator. CONSTITUTION: Connection is made from this side of a discharge side check valve 2 to a piping 9 on the outlet side of a liquid separator to form a bypass pipeline. An solenoid value 6 provided on the bypass pipeline is opened to let a high pressure gas refrigerant in a compressor chamber pass through the bypass pipeline and is released into a piping 9 on the outlet side liquid separator at a connection part 11 on the outlet side of the bypass pipeline. The released high pressure refrigerant fails to flow to the side of a compressor 1 because of a drive resistance of a motor but flows to a low pressure side device passing through the liquid separator 5. During the passage through the liquid separator 5, a large capacity of the liquid separator 5 reduces the pressure of the high pressure gas refrigerant, lowering a flow velocity thereof. This enables the completion of bypassing in a short time while lowering noises during the bypassing of the high pressure refrigerant with the bypass pipeline.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a refrigeration system.

[0002]

2. Description of the Related Art In the prior art, as described in Japanese Patent Application No. 63-3509, the outlet side connection port of a bypass line for bypassing a compressor discharge pipe and a suction pipe is a liquid separator (accumulator). It is on the entrance side.

[0003]

In the prior art, since the bypass pipe outlet side connecting position is on the liquid separator inlet side,
The high-pressure gas refrigerant in the compressor discharged from the bypass pipe does not flow to the liquid separator side, but flows to the low-pressure device side such as a showcase, so that there is a problem that the refrigerant flow noise and pipe impact noise become loud, which causes noise. In order to reduce the pressure, it is necessary to provide a capillary tube in the middle of the bypass pipe to reduce the pressure and release the gas. Therefore, there is also a problem that it takes time to complete the bypass.

An object of the present invention is to reduce the noise at the time of bypassing the high pressure gas refrigerant through the bypass pipe and complete the bypass in a short time.

[0005]

Means for achieving the above object will be described below. That is, the bypass pipe outlet side connecting portion is connected in the middle of the pipe between the liquid separator and the compressor. Alternatively, it is directly connected to the liquid separator body.

[0006]

The operation of the above means will be described below.

The bypass pipe outlet side connecting portion is connected midway between the liquid separator and the compressor. Alternatively, by directly connecting to the liquid separator body, the high-pressure gas refrigerant from the bypass pipe passes through the liquid separator having a large capacity and is silenced under reduced pressure. Therefore, it is possible to reduce the noise during bypass, and it is not necessary to use a decompression mechanism such as a capillary tube in the middle of the bypass pipe, so the flow rate in the bypass pipe is not reduced, so bypass can be completed in a short time. Is possible.

[0008]

Embodiments of the present invention will be described below.

FIG. 1 is a refrigeration cycle system diagram of one embodiment of the present invention. In FIG. 1, the compressor 1 is a high pressure chamber type compressor in which the pressure inside the compressor chamber is high. In the refrigeration cycle, a check valve for preventing refrigerant backflow from the high pressure side to the low pressure side during operation stoppage, a liquid separator 5 for preventing refrigerant liquid return to the compressor 1, and foreign matter in the compressor 1 are mixed. A refrigeration cycle is formed by equipping the suction pipe strainer 4 for prevention.

As a bypass line for the purpose of reducing the load at the time of starting the compressor, a pipe from the front of the discharge side check valve 2 to the liquid separator outlet pipe 9 is connected to form a bypass line. A strainer 7 and a solenoid valve 6 that is opened only for a predetermined time before the compressor is activated are installed in the bypass line.

When the solenoid valve 6 is opened, the high pressure gas refrigerant in the compressor chamber passes through the bypass pipe and is discharged from the bypass pipe outlet outlet side connection portion 11 into the liquid separator outlet side pipe 9. The discharged high-pressure gas refrigerant does not flow to the compressor 1 side due to the electric motor drive resistance, but passes through the liquid separator 5 and flows to the low-pressure side device.

Since the liquid separator 5 has a relatively large capacity when passing through the liquid separator 5, the high pressure gas refrigerant is decompressed and the flow velocity is also reduced, so that the refrigerant flowing noise can be reduced.

FIG. 2 shows a system diagram of a bypass line in the prior art. In the figure, a capillary tube 10 is provided in the bypass pipe as a pressure reducing mechanism for the purpose of reducing noise due to refrigerant flow noise and pipe impact noise during bypass, and the bypass pipe outlet side connection portion 11 is sucked in for the purpose of preventing foreign matter from entering. It is connected to the inlet side of the pipe strainer 4.

In the present invention, as shown in FIG. 1, since the depressurizing mechanism such as the capillary tube is not provided in the bypass conduit, the flow rate of the high pressure gas refrigerant in the bypass conduit is large as compared with the prior art, and therefore, It is possible to reduce the high-pressure side pressure in the compressor 1 below a predetermined value in a short time, and therefore,
By shortening the setting time of the bypass solenoid valve 6,
It is also possible to shorten the time from the start signal to the completion of the startup bypass and the startup of the compressor 1. Therefore, it is possible to improve the temperature accuracy of low-voltage equipment such as a showcase.

FIG. 3 shows an embodiment having a structure in which the bypass pipe outlet side connection portion 11 of FIG. 1 is modified and directly connected to the main body of the liquid separator 5 to discharge the high pressure gas refrigerant into the liquid separator 5. It is an example cycle system diagram.

In FIG. 3, in order to discharge the high-pressure gas refrigerant into the liquid separator 5 as described above, the pressure is reduced in the immediate vicinity of the bypass conduit outlet connection portion 11, so that the bypass conduit outlet connection portion 11 is different from FIG. It is possible to further reduce the whistle blowing noise and the impact noise that impacts the pipe wall.

1 and 3, a strainer 7 is provided in front of the solenoid valve 6 in the bypass pipe to prevent the foreign matter from entering the compressor 1 from the bypass pipe to prevent the foreign matter from entering the solenoid valve 6 and the compressor 1. Can be achieved.

[0018]

According to the present invention, noise such as refrigerant flow noise and pipe impact noise during bypass can be reduced, and the bypass can be completed in a short time. Since the time to
It is possible to improve the temperature accuracy of low-voltage equipment such as a showcase.

[Brief description of drawings]

FIG. 1 is a system diagram of a refrigeration cycle according to an embodiment of the present invention.

FIG. 2 is a system diagram of a bypass pipe section in the related art.

FIG. 3 is a system diagram of a refrigeration cycle of one embodiment according to the present invention.

[Explanation of symbols]

1 ... Compressor, 2 ... Check valve, 3 ... Condenser, 4 ... Suction pipe strainer, 5 ... Liquid separator, 6 ... Solenoid valve, 7 ... Strainer, 8 ... Liquid separator inlet side piping, 9 ... Liquid separation Pipe outlet side, 10 ... Capillary tube, 11 ... Bypass pipe line outlet side connection part.

Claims (1)

[Claims] 1. A start bypass circuit for connecting a compressor discharge pipe and a suction pipe by a bypass pipe, opening a bypass pipe before starting the compressor, and bypassing a refrigerant gas in a compressor chamber to a low pressure side by the bypass pipe. In the refrigeration cycle having the above, the refrigeration apparatus is characterized in that the connection portion on the outlet side of the bypass pipe is located in the middle of the pipe between the liquid separator and the compressor.