Mine-used medium and high voltage frequency converter circulating cooling device

Abstract

The invention provides a forcibly-circulating cooling radiating device and method in order to solve the radiating problem of a middle-high voltage frequency converter for mining, the power of the frequency converter can reach 3000kW, and the requirements for mine production can be effectively met. The method comprises the steps that a circulating air flow channel is established, and forcible circulating of air is established. The device comprises a radiator. After cold air enters a frequency converter power module, first-time heat exchanging is carried out, module cooling is achieved, after the cold air passes through the radiator, second-time heat exchanging is carried out, heat is transmitted to the radiator, hot air is turned into cold air, air is forcibly driven to flow in a circulating mode through a fan, and cooling of the frequency converter is achieved.

Description

technical field [0001] The invention relates to a cooling device and method for medium and high voltage frequency converters used in mines, in particular to the cooling of cascaded high-power frequency converters, and provides a circulating cooling method for medium and high voltage frequency converters used in mines. Background technique [0002] In recent years, the development of power electronics and automatic control technology has also promoted the upgrading of coal mine production equipment. In order to meet the requirements of energy saving and safety production in coal mines, more and more flameproof frequency converters are used in coal mines, and require extremely high reliability. The high-power motors of mechanical equipment in coal mines generally adopt frequency conversion speed regulation, which can significantly improve the applicability of mechanical equipment to working conditions, thereby improving productivity and saving a lot of electric energy. Due to...

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Problems solved by technology

The characteristic is that the cooling efficiency is high, the frequency converter can reach hundreds of kW, the volume is relatively small, and the radiator selection is relatively easy. Due to the high voltage of the medium and high voltage frequency converter, the IGBT cannot be directly installed on the bottom plate of the shell, and the heat cannot be directly dissipated to the On the external radiator, so this cooling method is only suitable for low-voltage inverters, not suitable for medium and high voltage inverters

(3) Water-cooled heat dissipation The heat dissipation efficiency of water-cooled radiators is extremely high, which can greatly increase the capacity of power components. However, the electrical insulation performance of ordinary water is extremely poor, and impurity ions in water will cause electrical corrosion and leakage under high voltage. Moreover, due to the hard water quality in the well, scale is easy to form in the water channel, which hinders the heat dissipation effect and may block the water channel. It is generally used for low-voltage inverters

A little carelessness will cause leakage and short circuit faults, and if it is a medium or high voltage equipment, it may also cause serious accidents

(4) Oil-cooled heat dissipation Although the heat dissipation efficiency of oil-cooled radiators is not as high as that of water-cooled methods, it has been widely used in ordinary high-power inverters due to its high electrical insulation and electromagnetic shielding effects, but its cost and environmental impact The requirements have gradually faded out these years, and according to coal mine safety regulations, oil-filled electrical equipment is not allowed to be used underground in coal mines, and oil-cooled heat dissipation methods cannot be used in coal mines

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