Cooling system for power electronic equipment

Abstract

The invention provides a cooling system for power electronic equipment. The cooling system comprises an evaporator, a gas-liquid separator, a compressor and a condensing device. Wherein an outlet of the evaporator is connected with an inlet of the gas-liquid separator. An inlet of the compressor is connected with an outlet of the gas-liquid separator, and an outlet of the compressor is connected with an inlet of the condensing device. A throttle valve is arranged between an outlet of the condensing device and an inlet of the evaporator. According to the provided cooling system for the power electronic equipment, a working medium at the outlet of the evaporator can carry liquid, and meanwhile it is ensured that the air suction end of the compressor can suck superheated steam without liquid; therefore, the temperature near the outlet of the evaporator can be prevented from sharply rising to exceed the allowable working temperature value of the power electronic device, and the failure rate increasing caused by thermal fatigue of internal welding of the device due to relatively large temperature fluctuation can be avoided so that different requirements on the cooling system under different environment temperatures and different working conditions can be met.

Description

technical field [0001] The invention relates to the technical field of power electronic equipment cooling, in particular to a cooling system for power electronic equipment. Background technique [0002] With the development of power electronics technology and the further improvement of social electrification, the heat dissipation requirements of electrical equipment are increasing. With the increasing demand for weight reduction and volume reduction, the power density is also increasing. Water cooling can no longer meet the cooling demand of high power density, and refrigeration systems are widely used in power electronic equipment. [0003] At present, the refrigeration system used for cooling power electronic equipment is mainly based on the principle of simply transplanting the air conditioning system, using high condensation pressure to increase the condensation temperature, and then reducing the pressure through throttling, so that the evaporation temperature can be con...

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Problems solved by technology

On the one hand, its peak may exceed the allowable operating temperature value of power electronic devices; on the other hand, large temperature fluctuations will cause thermal fatigue of the internal soldering of the device, thereby increasing the failure rate

[0004] On the other hand, in addition to providing the power for the refrigerant cycle in the system, the compressor also needs to work on the refrigerant, compress the volume, and increase the pressure of the refrigerant so that it can transfer heat between the high-temperature cold source and the low-temperature heat source. This compression process is will consume a lot of mechanical energy

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