Method for Improving Unbalanced Three-phase Power Supply in Hot Zone of Large Hot Isostatic Press

Abstract

The invention discloses a method for improving unbalanced three-phase power supply of a hot zone in a large-scale hot isostatic pressing machine. The problems of unstable voltage and reduced efficiency caused by a serious unbalanced phenomenon of three-phase loads of the hot isostatic pressing machine can be obviously eliminated. The method of the invention is implemented by the following steps that: in a pressure vessel of the hot isostatic pressing machine, a hot zone space formed by a heat screen arranged at the upper part and a thermal insulation pad arranged at the bottom is divided into a plurality of hot zones according to the height; a heating element (4) in one hot zone with the lowest height is configured as three loads connected to three extraction electrodes, and the heating element in every other zone is configured as a single load with two extraction electrodes; each electrode is extracted out of the pressure vessel through an electrode extraction device (5) and is connected to a three-phase transformer and controller (7) and other multiple single phase transformer and controllers (6), and the temperature in the hot zones with various heights is independently controlled and the output power is adjusted; and out of the pressure vessel, the three-phase transformer and controller (7) and the single phase transformer and controllers (6) are connected to a corresponding electric system having transforming control according to a corresponding connection method, and then connected to a three-phase five-wire power supply system.

Description

technical field [0001] The invention relates to a method for improving the unbalanced three-phase power supply in the hot zone, which is mainly suitable for large-scale hot isostatic presses. Specifically, the invention relates to a method for rationally setting heating elements in hot isostatic presses . Background technique [0002] Hot isostatic press is an isostatic pressing device for pressing and sintering. It uses nitrogen or argon gas as the pressure transmission medium in a closed container, and under the combined action of high temperature and high pressure, the workpiece is pressed and sintered. deal with. Large hot isostatic presses achieve the desired temperature in the heating zone by arranging heating elements in the furnace zone. Due to the atmosphere environment, the furnace wire performs heat exchange on the gas and structural parts (including parts) in the hot zone through radiation and convection. When the gas is heated, the expansion density becomes l...

AI Technical Summary

Problems solved by technology

The impact of the power supply quality caused by the serious imbalance of the three-phase load, in addition to greatly affecting the energy efficiency of the power grid, in turn has a negative impact on the equipment itself, and even directly affects the performance and service life of all electrical components.

As far as the current usage situation is concerned, it has no direct effect on improving the unbalanced state of the three-phase load of the power grid.

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