Refrigeration device

Abstract

Provided is a refrigeration device which can, independently of outside air temperature, ensure stable refrigeration performance when the high-pressure side has a supercritical pressure, and which can improve cost and the easiness of construction. A refrigeration device is provided with: a pressure regulating throttle means which is connected to a refrigerant circuit which is located downstream of a gas cooler and upstream of a main throttle means; a decompression tank which is connected to a refrigerant circuit which is located downstream of the pressure regulating throttle means and upstream of the main throttle means; a split heat exchanger which is provided in a refrigerant circuit which is located downstream of the decompression tank and upstream of the main throttle means; an auxiliary circuit which allows a refrigerant within the decompression tank to be sucked into the intermediate pressure section of a compressor after causing the refrigerant to flow to a first flow passage in the split heat exchanger through an auxiliary throttle means; and a main circuit which allows a refrigerant to flow out from the lower part of the decompression tank, causes the refrigerant to flow to a second flow passage in the split heat exchanger, subjects the refrigerant to heat exchange with a refrigerant flowing through the first flow passage, and then causes the refrigerant, having been subjected to heat exchange with the refrigerant flowing through the first flow passage, to flow into the main throttle means.

Description

technical field [0001] The invention relates to a refrigerating device with a refrigerant circuit composed of a compression device, a gas cooler, a main throttling device and an evaporator, and the high-pressure side is a supercritical pressure. Background technique [0002] In the past, this kind of refrigeration device constituted a refrigeration cycle by a compression device, a gas cooler, and a throttling device. The refrigerant compressed by the compression device dissipated heat through the gas cooler. , the surrounding air is cooled by the evaporation of the refrigerant at this time. In recent years, in such refrigerators, Freon-based refrigerants cannot be used due to environmental problems and the like. Therefore, as a substitute for CFC refrigerants, a configuration using carbon dioxide, which is a natural refrigerant, has been developed. This carbon dioxide refrigerant is known to be a refrigerant having an excessively large high-pressure difference, has a low c...

AI Technical Summary

Problems solved by technology

[0009] However, especially under refrigeration conditions such as a refrigerator in which the evaporation temperature of the refrigerant in the evaporator becomes high, if the outside air temperature fluctuates, the pressure of the refrigerant flowing into the main throttling device fluctuates greatly, and the main section Flow unit control and cooling capacity becomes unstable

In addition, in stores such as supermarkets, when supplying refrigerant from a refrigerator equipped with a compressor and a gas cooler to a showcase in a store equipped with a main throttle device and an evaporator, the main throttle on the showcase side The high-pressure side of the device has high pressure, so long refrigerant pipes (liquid pipes) must use pipes with high pressure resistance, and the construction cost is not good

[0010] In addition, when the operation is started in an environment with high ambient air temperature, the first refrigerant flow will not be liquefied in the refrigerant circuit under refrigeration conditions with a high evaporation temperature, and even if the above-mentioned separate cycle is configured, it is almost impossible to expect Cooling effect of the second refrigerant flow based on the first refrigerant flow

Therefore, liquid refrigerant cannot be delivered to the main throttling device

In addition, when a refrigerant such as carbon dioxide is used, the pressure on the high-pressure side fluctuates greatly due to seasonal factors, and it is difficult to determine an appropriate refrigerant charging amount.

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