Cooling system

Abstract

The present invention provides a cooling system, which includes a compressor for compressing refrigerant, a condenser for condensing the refrigerant compressed by the compressor, an expansion valve for expanding the refrigerant condensed by the condenser and an evaporator for evaporating the refrigerant expanded by the expansion valve. The cooling system comprises: a suction pressure control valve provided to a refrigerant inflow pipe connecting the compressor to the evaporator, enabling the refrigerant supplied from the evaporator to the compressor to have a pressure less than or equal to a predetermined pressure so as to prevent the overload of the compressor, and having a refrigerant supply amount set to be supplied with the refrigerant with an amount less than the compression capacity of the compressor; and an unloading part including an unloading bypass pipe provided to the refrigerant inflow pipe which is parallel to the suction pressure control valve and having a refrigerant supply amount corresponding to a difference between the refrigerant supply amount corresponding to the compression capacity of the compressor and the refrigerant supply amount of the suction pressure control valve and an opening and closing valve for opening or closing the bypass pipe, and enabling the start of unloading so as to supply the compressor with the refrigerant of an amount less than the compression capacity of the compressor only through the suction pressure control valve by closing the bypass pipe through the opening and closing valve when the compressor is initially started or re-started while enabling a normal start so as to supply the refrigerant of an amount corresponding to the compression capacity of the compressor through the suction pressure control valve and the bypass pipe by closing the bypass pipe through the opening and closing valve when the compressor is normally started after a predetermined time.

Description

technical field [0001] The present invention relates to a cooling system, and in more detail to a cooling system, as a cooling system suitable for refrigerated vehicles, air conditioners, refrigerators, etc., which reduces the amount of refrigeration flowing into the compressor when the compressor is initially started or when it is restarted after starting and stopping. The flow rate of the refrigerant can prevent unloading, and the flow rate of the refrigerant can be increased to correspond to the compression capacity of the compressor during normal start-up, thereby improving the start-up efficiency of the compressor and preventing damage due to hydraulic pressure. Background technique [0002] In general, as disclosed in Registered Utility Model No. 20-0300275, etc., the cooling system consists of a compressor that compresses the circulating refrigerant at high pressure, a condenser that condenses the compressed high-temperature refrigerant, and a refrigeration system that...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned cooling system, the unloading valve must be integrally installed inside the crankcase of the compressor. Therefore, the unloading valve cannot be applied to compressors that are usually manufactured in a hermetic type, and the structure is complicated, which increases the manufacturing cost.

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