JPS60178257A - 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 relates to a refrigeration cycle, and specifically relates to a refrigeration cycle equipped with 17J: a condensing pressure regulating valve and a pressure control valve.

[Background of the invention of Kujin Mibu] In air-cooled refrigeration TA, generally when cooling in winter, a condensing pressure regulating valve is installed on the outlet side of the air side heat exchanger.
In addition, a bypass pipe is provided to connect the discharge pipe of the compressor and the liquid receiver, and a pressure control valve is provided in the bypass pipe, and high pressure gas is introduced into the liquid receiver through the entire bypass pipe. One way to ensure the internal pressure of the vessel is to control the internal pressure using the pressure control valve. However, during cooling operation in winter, the high-pressure pressure is lower than during cooling in summer, so the low-pressure side pressure also decreases accordingly. If the low pressure decreases too much, a portion of the cold water in the chiller unit will freeze, and in the pan cage, deposits will occur on the negative side heat exchanger. Therefore,
Conventionally, a low 1EiE
We are trying to prevent the power from decreasing too much, but at present there is only a slight difference between the low-pressure ball kasuinochi setting and the low-pressure operation side. Not only was it not possible to operate stably, but there was also the danger of freezing and matting as described above.

[Purpose of the invention]

The purpose of the present invention is to enable stable operation without lowering the low pressure even when the outside air pressure is low, and to achieve f! 4! An object of the present invention is to provide a refrigeration cycle which can also prevent the occurrence of drying.

[Inventive tendency, J, skin]

In order to achieve this object, the present invention decompresses a part of the high-pressure gas refrigerant flowing to the liquid receiver side through the pressure control valve at the same time as the operation of the pressure control valve by a capillary and flows it to the low pressure side. This is to prevent a drop in the power on the low-pressure side and to prevent the high-pressure liquid refrigerant in the liquid receiver from moving backwards to the low-pressure side when the operation is stopped.

[Embodiments of the invention]

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

The figure shows a system diagram of a cooling cycle according to the invention,
Compressor 1, air side heat exchanger 2, condensing pressure regulating valve 3, liquid receiver 4, solenoid valve 5, expansion valve 6, water cooler (currently load side heat exchanger) 7, in that order [piping] It is connected. A first bypass pipe 8 is provided that connects the discharge pipe of the compressor 1 and the liquid receiver 4. A pressure control valve 9 and a receiver for transmitting high-pressure gas refrigerant are provided in the middle of the first bypass pipe 8. A check valve 10 that allows flow only toward the 4th side is provided. There is still a second bypass pipe #11 connecting the first bypass pipe 8 between the pressure control rJ41 valve 9 and the check valve 10 and the suction pipe of the extractor 1, and the second bypass pipe #11 is provided. Piping 11
A capillary 12 is provided in the middle.

Next, the operation of the present invention will be explained. The high-width, high-pressure gas refrigerant discharged from the air side heat exchanger 2 enters the air-side heat exchanger 2, where it is cooled by the outside air and condenses to become a liquid refrigerant. The liquid refrigerant that flows out passes through the condensation pressure regulating valve 3 and enters the liquid receiver 4, then passes through the magnetic valve 5 and is depressurized by the expansion valve 6, becoming a low-temperature, low-pressure wet gas that is sent to a water cooler or load-side heat exchanger. The refrigerant cools the cold water or air, becomes a gas refrigerant, and returns to the compressor 1.

In the above-mentioned cooling operation, as the outside temperature decreases, the condensing pressure also decreases, but when that pressure decreases due to changing the set value of the condensing pressure regulating valve 3, the cough condensing sub-regulating valve 3 gradually closes.
Liquid refrigerant begins to enter the live air side heat exchanger 2. As a result, the condensing capacity of the air side heat exchanger 2 decreases and the condensing output increases. On the other hand, the condensing pressure regulating valve 3 When the pressure inside the liquid receiver 4 decreases due to the squeezing, the pressure control valve 9 of the first bypass pipe #8 opens, and the high pressure gas refrigerant passes through the first bypass pipe 8 and flows into the liquid receiver 4. The gas refrigerant flowing through the first bypass pipe 8 is depressurized by the capillary 12 and flows into the suction pipe from the second bypass pipe 11. When the temperature rises, the condensing pressure regulating valve 3 is fully opened and the low IEE force is increased to some extent.
's valve 9 is closed, and there is no bypass to the low pressure side. In this state, the high EEE force is increasing, so the low llE!
The IIE force increases accordingly. Furthermore, when the operation is stopped, the check valve 10 of the first bypass pipe 8 prevents the high-pressure liquid refrigerant in the liquid receiver 4 from flowing back to the low rfE side (At).

Therefore, in the refrigeration cycle according to the present invention, even when the outside temperature is low, it is possible to prevent the low pressure from falling below 1 degree Celsius, so that stable operation can be performed. Also, by preventing a decline in Enou's power, there is no need to lower the setting value of the 1st grade switch.
It is possible to prevent part of the cold water from freezing in the chiller container, and 61 parts in the package.

〔Effect of the invention〕

As explained above, the present invention prevents a drop in low pressure even when the outside temperature is low, so stable operation can be performed, and there is no need to lower the set value of low pressure, so freezing, It is possible to prevent the occurrence of wear.

[Brief explanation of the drawing]

The drawing shows a system diagram of a refrigeration cycle according to the invention. 1... Compressor 2... Air side heat exchanger (projection) 3...
Condensing pressure regulating valve 4...Liquid receiver 6...Expansion valve 7
...Water cooler switch or load side heat exchanger 8...1st...
Piping 9...Mocha control valve 10...Check valve 11...Second pass piping 12...Capillary.

Claims (1)

[Claims] Compressor, air side heat exchanger, condensing pressure regulating valve, liquid receiver
An expansion valve, a water cooler, or a load-side heat exchanger are arranged and connected in this order, and a first bypass piping is provided to connect the discharge pipe of the compressor and the liquid receiver, and the first bypass piping is connected to the liquid receiver. A second bypass includes a pressure control valve and a check valve that allows refrigerant to flow only toward the liquid receiver, and connects the first bypass pipe between the pressure control valve and the check valve and the suction pipe of the compressor. Install piping,
The cold storage (Tozaikuru) is characterized by having a capillary installed in its second bypass piping.