Gas-liquid heat exchange type refrigeration device

Abstract

The invention discloses a gas-liquid heat exchange type refrigeration device. Refrigeration capability variations caused by the variations of the turnover number of a compressor can be suppressed, and the rise of discharge temperature at an outlet of the compressor can be suppressed to prevent refrigerator oil from being degraded. The liquid-gas heat exchange type refrigeration device consists of the compressor 1, a condenser 2, a heat exchange control valve 3, a gas-liquid heat exchanger 4, an expansion valve 5 and an evaporator 6, which are connected in series through a coolant pipeline to form a closed coolant circulation pipeline. A discharge temperature sensor 7 is arranged between the compressor 1 and the condenser 2 of the coolant circulation loop. A pressure sensor 8 is arranged between the heat exchange control valve 3 and the gas-liquid heat exchanger 4. A controller (control device) 10 is also arranged to control the opening of the heat exchange control valve 3 on the basis of coolant temperature detected by the discharge temperature sensor 7 at the outlet of the compressor 1 and coolant pressure detected by the pressure sensor 8 at an outlet of the heat exchange control valve 3.

Description

technical field [0001] The invention relates to a gas-liquid heat exchange type refrigeration device, which uses the refrigerant condensed by the condenser and the refrigerant evaporated by the evaporator to exchange heat with each other in a gas-liquid heat exchanger, so that each refrigerant is overcooled and cooled separately. Overheating, thereby increasing the freezing capacity. Background technique [0002] Generally speaking, a refrigeration device is a closed-circuit refrigerant circulation loop composed of a refrigerant pipeline connecting a compressor, a condenser, an expansion valve, and an evaporator in series. The high-pressure gaseous refrigerant compressed by the compressor is released in the condenser. It releases heat and liquefies to become a high-pressure liquid refrigerant. After the expansion valve expands the liquid refrigerant (isoenthalpic expansion) and decompresses it, in the evaporator, the low-pressure liquid refrigerant whose boiling point has be...

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Problems solved by technology

[0009] However, if the refrigerating and air-conditioning apparatus proposed in Patent Document 1 is operated in an environment where the number of revolutions of the compressor greatly fluctuates, such as in a refrigerated vehicle, the heat exchange performance of the gas-liquid heat exchanger will also be accompanied by compression. The number of revolutions of the machine changes greatly

For example, if the number of revolutions of the compressor decre

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