(1) Layout of frequency converter structure

We will design the main circuit as a large unit, installed on the rear wall of a rectangular explosion-proof chamber. On the rear wall, a transition heat sink is connected to the IGBT module, rectifier module, and other heating elements. The outer wall of the explosion-proof shell is welded with a groove shaped heat sink, which is connected to the transition heat sink through a heat pipe. The heat generated inside the frequency converter is dissipated through the heat pipe groove shaped radiator on the back wall of the explosion-proof chamber.

(2) Principles of Heat Pipe Technology

Heat pipe is a type of heat transfer element with extremely high thermal conductivity. It transfers heat by evaporating and condensing the working fluid inside a fully enclosed vacuum tube. It has a series of advantages such as high thermal conductivity, good isotherm, adjustable heat transfer area on both sides, long-distance heat transfer, and controllable temperature. A heat exchanger composed of heat pipes has advantages such as high heat transfer efficiency, compact structure, and low fluid resistance loss.

Explosion proof treatment of explosion-proof frequency converters

Due to the presence of explosive gases or dust in the environment used by the frequency converter, it is required that the frequency converter be sealed and explosion-proof. Therefore, its casing cannot be ordinary, and a standard explosion-proof chamber must be used. All components of the frequency converter must be installed in the explosion-proof chamber. Open an observation window on the explosion-proof chamber door, install the display part on the panel, and start, stop, and speed control.