Mine flameproof and intrinsically safe variable frequency speed control device

Abstract

The invention relates to a mine flameproof and intrinsic safety type variable frequency speed control device, which comprises a frequency converter consisting of a three-phase rectifier, a filtering capacitor and an IGBT inverter, a control device, and a flameproof case body, wherein the control device comprises an isolating switch, a power frequency and secondary control loop, and a variable frequency and control loop. The variable frequency speed control device has a variable frequency operating mode and a power frequency operating mode, and gives priority to the variable frequency operating mode complemented with the power frequency operating mode, thus the variable frequency speed control device not only can regulate the speed and save energy better, but also has the advantages of dust control, moisture protection, flame protection, and the like; and the variable frequency speed control device adopts digital display, which not only has a function of remote and approach controls, but also has functions of displaying electric energy, namely displaying load electric energy clearly, and temperature control, and has protection functions of surge protection, open phase protection, over voltage protection, under-voltage protection, and the like. The variable frequency speed control device can be applied to underground places with coal dust or gas coal dust explosion in coal mines to perform controls of starting, stopping and variable frequency speed control on a three-phase flameproof motor, and performs various protections on the motor. The variable frequency speed control device adopts a variable frequency speed control method which is advanced and can be widely popularized.

Description

Technical field: [0001] The invention relates to a motor frequency conversion control technology, more specifically to a mining explosion-proof and intrinsically safe frequency conversion speed regulating device. Background technique: [0002] In the prior art, motor frequency conversion control technology is rapidly and widely used in industrial production fields, such as machinery, household appliances, metallurgy, light textile and other industries. It can regulate speed very well and has obvious energy-saving functions. But its disadvantage is that due to the use of high-power power semiconductors as rectifier and inverter components, its heat dissipation problem has always hindered the use of frequency conversion technology in flammable and explosive environments such as mines, and in mining such as belt conveyors, hoisting winches, fans, scrapers Transport aircraft and others require full torque starting, variable load operation, and soft start and soft stop, all of wh...

AI Technical Summary

Problems solved by technology

But its disadvantage is that due to the use of high-power power semiconductors as rectifier and inverter components, its heat dissipation problem has always hindered the use of frequency conversion technology in flammable and explosive environments such as mines, and in mining such as belt conveyors, hoisting winches, fans, scrapers Transport aircrafts require full torque start, variable load operation, soft start and soft stop, and frequency conversion technology is required, but general-purpose frequency converters cannot meet the requirements of flammable and explosive environments.

Images