Frequency converter

Abstract

A frequency converter relates to electrical equipment and comprises a frequency conversion circuit and a cabinet body, the cabinet body comprises a cabinet door, a display and a controller which are connected with the frequency conversion circuit are arranged on the cabinet door, the cabinet door is in sealing contact with the cabinet body, a vacuum pump and a gas storage tank are arranged on theinterior of the cabinet body, compressed nitrogen is stored in the gas storage tank, a flow pump is arranged on the gas storage tank, the flow pump is connected with the interior of the cabinet body,one end of the vacuum pump is located inside the cabinet body, the other end of the vacuum pump is located outside the cabinet body, the interior of the cabinet body is full of nitrogen after being sealed, and internal pressure is higher than external pressure. The frequency converter is sealed and stored in the cabinet body full of the nitrogen, dust and impurities of the outside world are isolated, constant temperature and constant humidity in the cabinet body also can be guaranteed, occurrence of oxidation reaction is completely eradicated due to no contact of oxygen, service life of the frequency converter is greatly prolonged, and occurrence rate of a fault is reduced; besides, occurrence of a fire also can be reduced under inhibition effect of the nitrogen after the frequency converter is exploded.

Description

Technical field [0001] The invention relates to an electrical equipment, especially a frequency converter. Background technique [0002] Frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply. The frequency converter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit and micro processing unit. The inverter adjusts the voltage and frequency of the output power supply by the opening and closing of the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter has many protection functions. , Such as overcurrent, overvoltage, overload protection and so on. With the continuous improvement of industrial automation, frequency converte...

AI Technical Summary

Problems solved by technology

The frequency converter may explode during use. There are two main reasons for the explosion. Most of the explosions are caused by external or internal short circuits, which cause instantaneous or long-term overvoltage and overcurrent, resulting in overloading of modules or capacitors, and explosions due to heat swelling; a few are due to device Quality problems or natural aging, power performance decline

Once the frequency converter explodes, it will affect other normal equipment, causing heavy property losses and sometimes heavy casualties

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