Combined frequency changer for mining

Abstract

The invention discloses a mine-used combined frequency converter, which consists of an explosion-resistant enclosure, frequency converters, a cooling device, built-in electric reactors and filters and so on, and has a combined structure, that is, a plurality of frequency converters are arranged in the explosion-resistant enclosure. A main controller for controlling the frequency converters, a refrigeration device, an isolating switch, and a pilot control circuit can be arranged in the explosion-resistant enclosure. The mine-used combined frequency converter is applicable to the frequency control and centralized control of multi-point driving and single-point driving of a plurality of equipment motors in explosive gas environments such as underground coal mines. The combined structure has centralized equipment and small occupation space, reduces installation and maintenance workload, and reduces the cost. The built-in main controller can intensively control the working state of the frequency converters and meet various control requirements; and the man-machine conversation is realized through a keyboard display, which has flexible control and convenient setting. A heat pipe radiator has high efficiency; and the built-in refrigeration device strengthens the temperature reduction and improves the service life of the frequency converters. An alternating current voltage-stabilizing pilot circuit has simple external connection. The mine-used combined frequency converter has the advantages of simple structure and easy production.

Description

technical field [0001] The invention relates to the field of frequency conversion and speed regulation of electric motors, in particular to a mining combined frequency converter used for multi-point driving and single-point driving in an explosive gas environment and centralized frequency conversion and speed regulation control for multiple devices. Background technique [0002] With the development of my country's coal science and technology, the power of equipment used in explosive gas atmospheres is increasing year by year and high-power equipment is used intensively. Multi-point drive equipment such as: belt conveyors, scraper conveyors, etc. are mostly driven by multiple motors, and the emulsion pump station is operated in a centralized manner. At present, high-power multi-point drive equipment is generally driven by multiple independent explosion-proof frequency converters, plus external supporting reactors and filters, and a separate control system that needs to be co...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the existing motors of multiple explosion-proof equipment driven by multiple single frequency converters, many devices, large space occupation, inconvenient installation and maintenance, and inconvenient centralized control, the present invention provides a mine-used combined frequency converter, which integrates Multiple frequency converters are integrated, occupying a small space, easy to install and maintain, easy to centralize control, and low in cost; it can meet the needs of different control in various working conditions

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