JPS6026253A - Refrigeration cycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a refrigeration cycle with an injection circuit.

[Technical background of the invention and its problems]

In general, there is a strong demand for refrigeration cycles used in refrigerators, air conditioners, etc. to have low power consumption and high cold iJI power saws. Therefore, the efficiency of the refrigeration cycle is improved mainly by improving the efficiency of the compressor itself, which is the main 4F4 engine of 1 refrigeration unit, and by improving the efficiency of the control of the refrigerant flow circulating in the refrigeration cycle. . As a means to improve the efficiency of the compressor itself, for example, a 12219237 circuit can be installed to bypass connect the piping from the condenser to the evaporator and the compressor (12219237).
The latent heat effect of the refrigerant flowing in the circuit controls the temperature of the windings of the compressor and improves motor efficiency. In addition, as a means to improve the efficiency from the viewpoint of controlling the refrigerant flow, for example, check valves and solenoid valves are installed in the piping from the evaporator to the compressor, and in the piping from the condenser to the throttling device, respectively. There is a method that prevents high-pressure refrigerant on the high-pressure side from flowing into the evaporator and increasing the temperature of the evaporator by shutting off the high-pressure side and low-pressure side of the refrigeration cycle when the compressor is stopped. A refrigeration cycle that combines the above two means has also been considered for the purpose of greatly improving efficiency, an example of which is shown in FIG. By the way, this first
In the conventional refrigeration cycle shown in the figure, the connecting end opposite to the compression 1 and 2 of both ends of the injection circuit 1 is installed on the higher pressure side, that is, on the condenser 3 side. Therefore, when the compressor is stopped, high-temperature refrigerant flows backward through the injection circuit 1, reaches the evaporator 5, and increases the temperature of the evaporator 5. Therefore, a valve device, such as an electric valve, is used to prevent the reverse flow. It was necessary to provide one more valve 6 or check valve in the injection circuit 1.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigeration cycle that eliminates the drawbacks of the prior art described above and can improve efficiency without increasing costs or complicating assembly work.

[Summary of the invention]

The present invention provides a main refrigeration cycle (13 and , a 42919932 circuit is provided to bypass connect the gas storage part or the liquid storage thin part of the gas-liquid separator to the compressor, and a connecting end J of the 42919932 circuit on the gas-liquid separator side: low pressure This is a refrigeration cycle with a second valve device attached to the side.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the attached drawings. FIG. 2 is an IM diagram of a refrigeration cycle showing one embodiment of the present invention, which includes a rotary compressor 7, a condenser 8, a first throttle device @9, a gas-liquid separator 10, and a second throttle device. 11. In a main refrigeration cycle in which an evaporator 12 and a check valve 13 are successively arranged in an annular manner, an injection circuit 14 is provided which bypass-connects the upper end of the gas-liquid separator 10 and the rotary compressor U3I 7; This is a refrigeration cycle in which a solenoid valve 15 is provided in the middle of the piping from the gas-liquid separation device 10 to the second expansion device 11. The pressure at both ends of the injection circuit 14 is such that the zero pressure at the connection end on the rotary compressor side is always lower than the pressure at the connection end on the gas-liquid separator 10 side J:
The connection end on the rotary compressor 7 side is connected to the wall of the airtight container that houses the compressor body, and the compression (
It is directly connected to the main body.

In the refrigeration cycle configured as described above, when the rotary compressor 7 is driven, the refrigerant extracted from the rotary compressor 7 and reaching the gas-liquid N1 vessel 10 is converted into gas refrigerant by the gas-liquid separator 10. The gas refrigerant is stored in the upper part and the liquid refrigerant is stored in the lower part. The liquid refrigerant accumulated in the lower part passes through the second throttle device 11 and reaches the evaporator 12.
There, it evaporates, and after cooling the surrounding air by the action of latent heat of vaporization, it returns to the rotary compressor 7 again. Furthermore, among the pressures at both ends of the injection circuit 14, the pressure on the compression side is lower than the pressure on the gas-liquid separator side. Return to 7. At this time, the gas refrigerant expands adiabatically and becomes low temperature, and the low humidity gas refrigerant suppresses the upper winding temperature of the compressor motor, improving motor efficiency. When the ambient temperature of the evaporator 12 reaches a predetermined value, the temperature sensor q
is detected, and the rotary compression 4!17 stops.
), the solenoid valve 15 is closed. By the way, as shown in the book above, the solenoid valve 15 is connected to the air 'd1 of the injection circuit 14.
The pressure side is lower than the connection end on the separator 10 side, that is, air? Since it is provided in the middle of the piping from the Ik separator 10 to the second throttle device 11, the high-temperature refrigerant flows backward through the injection circuit 14 and goes to the evaporator 12.
The high temperature refrigerant flowing from the condenser 8 to the evaporator 12 is opened by the solenoid valve 15, and the high temperature refrigerant flowing back from the suction port of the rotary compressor 7 to the evaporator 12 is closed by the check valve 13. Therefore, the high-pressure side and the low-pressure side of the refrigeration cycle are completely shut off, and the high-temperature refrigerant on the high-pressure side can be prevented from flowing into the evaporator 12 and the temperature of the evaporator 12 from rising. In this way, the solenoid valve 15 can be installed simply by changing its position from the high-pressure side to the low-pressure side with respect to the connection end of the injection circuit 14 on the gas-liquid separator 10 side. Efficiency improvement with the same effect as efficiency improvement can be achieved with only two valve devices.

In this embodiment, one end of the injection circuit 14 is connected to the upper end of the gas-liquid separator 10 to form a gas injection circuit 1c.As shown in FIG. In addition, it is also possible to connect one end to the lower end of the gas-liquid separator 10 to form a liquid injection circuit with a pressure reducing function. In this case, when the rotary compressor 7 is driven, the gas-liquid separator The liquid refrigerant that is separated and flows into the liquid injection circuit 14 is gasified by the auxiliary throttle device 16, so that the same functions and effects as in the case of a gas injection circuit are achieved.

〔Effect of the invention〕

As described above, according to the present invention, the connection end on the gas-liquid separator side of the engine circuit that bypass-connects the compressor and the gas-liquid separator is also provided with a refrigerant backflow prevention device on the low pressure side. The valve! S
Since the i position is provided, there is no need for the JF device 4 such as a solenoid valve that was conventionally provided in the injection circuit, and it is possible to simplify the assembly work and prevent lost towns.

[Brief explanation of drawings]

FIG. 1 shows a conventional refrigeration cycle, and FIGS. 2 and 3 are explanatory diagrams showing the structure of a refrigeration cycle according to the present invention. 7... Compressor, 8... Condenser, 9... First throttle device, 10... Gas-liquid separator, 11... Second throttle device, 12... Evaporator, 13...Check valve, 14...
12219232 circuit, 15...electromagnetic button t116...
・Auxiliary aperture device. (7317) Agent: Patent Attorney Noriyuki Chika (and 1 other person)
Name) Kyu 1 Zu East 2 (2)

Claims (1)

[Scope of Claims] 1. A compression number, a condenser, a first throttle device, a gas-liquid separator, a second throttle device, an evaporator, and a first valve device are successively arranged in an annular manner, and the gas-liquid A refrigeration system in which a separator and a compression selector are connected by an injection circuit, and a second valve device is attached to the low pressure side of the connection end of the 12219237 circuit on the gas-liquid separator side. 2. The refrigeration recycle according to claim 1, wherein the injection circuit is a gas injection circuit having one end connected to a gas storage portion of the gas-liquid separator. 3. The injection circuit is a liquid injection circuit having one end connected to the liquid storage surface portion of the gas-liquid separator and capable of reducing pressure.
Refrigeration cycle as described in section.