Coal mine explosion-proof frequency converter

Abstract

The invention discloses a coal mine explosion-proof frequency converter. The coal mine explosion-proof frequency converter comprises an explosion-proof housing composed of a rear housing plate, a housing maintenance frame and a door; a rectification power unit is arranged in the explosion-proof housing, the rear housing plate is provided with a heat sink base plate partially stretching into the explosion-proof housing, the rectification power unit is fixed to the heat sink base plate, the external portion of the heat sink base plate extends outwards from the heat sink base plate to be provided with a plurality of cooling fins in parallel, and a cooling gap is arranged between the cooling fins. The coal mine explosion-proof frequency converter is long in service life, even in cooling and high in cooling efficiency. A cooling cycle of the coal mine explosion-proof frequency converter is among an IGBT (Insulated Gate Bipolar Transistor)-thermally conductive silicone grease-the base plate-the cooling fins. The attenuation of the transferred heat is less due to fewer heat transfer steps. The heat can be transferred rapidly due to no gas-liquid state change in the heat transfer process. The red copper cooling fins are high in heat conduction efficiency, so that more heat can be transferred to the air in the same time.

Description

technical field [0001] The invention relates to a frequency converter, in particular to a special explosion-proof frequency converter for coal mines. Background technique [0002] With the maturity and perfection of low-voltage AC frequency conversion speed regulation technology, general-purpose frequency converters have been rapidly and widely used. But sometimes, due to the particularity of the working conditions, general-purpose inverters seem to be stretched, such as: belt conveyors in coal mines, hoisting winches, fans, scraper conveyors and other motor-driven equipment that require speed regulation, as well as chemical plants. Part of the equipment is one example. Explosion-proof inverters are developed for these relatively special working conditions. Because explosion-proof inverters have the advantages of dustproof, moisture-proof, and explosion-proof, they are mainly used in coal mines, oil and gas, petrochemical and chemical industries. [0003] The main heating ...

AI Technical Summary

Problems solved by technology

[0008] 1. Low cooling efficiency

As mentioned above, a heat dissipation cycle needs to go through IGBT-thermal grease-heat dissipation substrate-heat pipe-refrigerant-liquid\gas\liquid conversion, in order to transfer heat to the refrigerant and radiate into the air. There are many links in the whole heat dissipation process, and the thermal resistance of different links Due to the difference in heat dissipation efficiency, the heat that can be dissipated gradually decreases step by step, and the refrigerant needs to go through three stages of liquefaction-vaporization-liquefaction, and the speed is relatively slow. In addition, because the specific heat capacity of the refrigerant is relatively small, so each gas-liquid conversion can take away Not much heat leads to low reaction speed of the whole system, resulting in low heat dissipation efficiency

[0009] 2. Uneven heat dissipation

In order to meet the heat dissipation efficiency, the distance between the heat dissipation fins of the heat pipe radiator is relatively large. When the heat dissipation is large, it is necessary to install an axial flow heat dissipation fan, which will further increase the cost and increase the volume.

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