Heat management system for electric locomotive traction converter

Abstract

The invention discloses heat management system for an electric locomotive traction converter. The heat management system comprises a cooling tower, an evaporator and an internal circulation draught fan. The cooling tower and a converter cabinet of the electric locomotive traction converter are connected into a whole. The evaporator and the internal circulation draught fan are installed in the converter cabinet. The cooling tower is provided with a compressor and a condenser. The compressor is connected with the condenser through a pipeline, refrigerant in the pipeline is compressed into high-temperature and high-voltage steam, and the heat is dissipated to the environment through the condenser. The refrigerant becomes high-temperature and high-voltage liquid and then is divided into two paths. One path of liquid enters a heat dissipation device of a power device in the converter cabinet and becomes a low-temperature and low-voltage gas-liquid mixing state to absorb heat. The other path of liquid enters the evaporator, and the internal circulation draught fan faces the evaporator so as to blow cold air into the converter cabinet. The heat management system has the advantages that the integral heat exchanging efficiency of the converter is improved, and the working temperature is reduced and is stable and is not affected easily by the outside environment.

Description

technical field [0001] The invention mainly relates to the field of rail transit vehicles, in particular to a heat management system suitable for traction converters of electric locomotives. Background technique [0002] In the application of modern high-power electric locomotives, with the increasing power of traction motors, the problem of heat dissipation of traction converters has become increasingly prominent, including high-power semiconductor devices such as IGBTs and diodes, as well as transformers, reactors, capacitors, etc. device. The above-mentioned devices generate a lot of heat, and the heat flux density of the actual heat dissipation is also increasing, but the maximum withstand temperature is limited, and the operating temperature and its fluctuations have a great impact on the life and reliability of power electronic devices; The passing current of some devices is also directly related. In this field, various heat dissipation technologies emerge in an endl...

AI Technical Summary

Problems solved by technology

At the same time, the cooling form and structure of the above structure also requires a huge external radiator to take away its heat

In the form of convective heat exchange, relying on the heat capacity of gas and liquid to take away heat, it has been unable to meet the heat dissipation requirements in some specific situations

In addition, in the existing cooling form, the working temperature of the cooled device will be affected by the heating power of different working conditions and the fluctuation of the ambient temperature, which is actually unstable. Under long-term temperature fluctuations, the device will fatigue due to thermal stress Ageing

Moreover, since the heat exchange area is related to the temperature difference and heat exchange efficiency, and the temperature difference should not be too large, the heat exchange efficiency has a limit, so the volume of the air-cooled or water-cooled heat exchanger is relatively large.

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