JPS6057163A - 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] [Field of Application of the Invention] The present invention uses valve control to control the flow of refrigerant to 11 when the compressor is stopped.
This invention relates to a refrigeration cycle that eliminates the pressure difference between the inlet and outlet of a compressor.

[Background of the invention 5; 1] When a conventional refrigeration cycle is shown in Fig. 1, 1 is a compressor, 2
is a condenser, 3 is a first pressure reducer, 4 is a second pressure reducer, 5 is an evaporator, 6 is a solenoid valve, 7 is a check valve, 8 is a bypass pressure reducer,
9 is a liquid-gas separator.

In such a refrigeration cycle, the solenoid valve 6 is opened during operation, and the refrigerant flows as shown by the solid line. At this time, gas-liquid separation 9
The separated refrigerant waste passes through the bypass pressure reducer 8 and returns to the compressor 1. If this cycle is plotted on a Mollier diagram, it will look like the solid line in Figure 2. When the compressor is stopped, the solenoid valve 6 is stopped, and the high-temperature waste passes through the bypass pressure reducer 8 and returns to the suction pipe side of the compressor 1.
- Increase power. Therefore, while the compressor 1 is stopped, there is no difference in pressure between the discharge side and the suction side of the compressor 1, which balances the pressure and makes it easier to start up. Here, since the refrigerant that normally returns to the suction side from the bypass armor reducer 8 during operation is a gas refrigerant, no performance deterioration occurs. However, in reality, in FIG. 2, point A of the Mollier diagram 11 is not on the saturated vapor line but falls into the saturated region, resulting in a problem that the performance deteriorates. This is because the gas-liquid separator does not work well and the gas is not completely separated.

[Purpose of the invention]

An object of the present invention is to provide a refrigeration cycle that does not cause a reduction in performance even if droplets are included in the refrigerant that is separated during operation of the compressor 1.

[Summary of the invention]

The present invention exchanges heat between the gas refrigerant generated by the pressure reducer and the refrigerant that is depressurized and enters the gas-liquid separator, thereby removing droplets from the refrigerant exiting the gas-liquid separator. It is now possible to bypass the compressor suction side without passing it through the evaporator, making it possible to create an ideal Nycle.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. The refrigerant separated by gas-liquid separation and containing droplets is depressurized by the bypass pressure reducer 8 and becomes low temperature. By exchanging heat between this low-temperature refrigerant and the refrigerant entering the gas-liquid separator,
Since the low-temperature refrigerant cools the refrigerant entering the separator, it is possible to reduce the enthalpy of the refrigerant entering the second pressure reducer and increase the refrigerating capacity.

To explain this with reference to FIG. 22, the Mollier diagram during operation becomes like a dotted line, the enthalpy of the bypass refrigerant entering the suction side of the compressor 1 is at point B, and the refrigerant separated from the gas-liquid separator 9 It is possible to create ZJi which does the same thing as if the gas had come out of the saturated steam line, and it is the same as if the gas-liquid separator operated completely ideally, and 111 to increase efficiency can be achieved.

As the heat exchange part of the present invention, the outlet part of the bypass pressure reducer 8 and the first pressure reducer are used as a heat exchanger. or the pipe between the first pressure reducer 3 and the gas-liquid separator 9, or the pipe leaving the bypass pressure reducer 8, the bypass pressure reducer 8 itself or the gas-liquid separator 9 and the bypass Usage “ε device 8”
The same effect can be obtained by exchanging heat with a pipe, etc. between the two.

〔Effect of the invention〕

According to the present invention, the refrigerant leaving the gas-liquid separator 9 and the gas-
By exchanging heat with the refrigerant entering the liquid separator 9, the efficiency of the refrigeration cycle can be made ideal, approximately 4%.
This can prevent the performance from deteriorating as much as possible.

[Brief explanation of the drawing]

' Fig. 11 is an explanatory diagram of a conventional refrigeration cycle, Fig. 2 is a Mollier diagram illustrating the present invention, and Fig. 3 is an explanatory diagram of the refrigeration cycle of the present invention. ■... Compressor, 2... Condenser, 3... First pressure reducer, 4... Second armor reducer, 5... Evaporator, 6... Solenoid valve (stop valve) , 7... Check valve, 8... Pressure reducer for NOKUINOX, 9... Gas-liquid separator. Representative Patent Attorney Akio Takahashi

Claims (1)

[Claims] Compressor (1), condenser (2), first reducer (3), gas-liquid section 1 unit (9), second pressure reducer (4), stop valve (
6) In a refrigeration cycle in which an evaporator (5) and a reverse 11 valve (7) are connected, a bypass pressure reducer (8) is provided on the pipe exiting the gas-liquid fraction II device (9), and rW H ? +
The condenser (2) is bypassed between the machine (1) and the check valve (7).
) and a gas-liquid separator (9), and a pipe connecting the gas-liquid separator (9) and the suction side of the compressor (1) to exchange heat. .