Vacuum pressure pouring process for epoxy resins insulation pouring piece of high voltage electric appliance

Abstract

The invention discloses a vacuum pressure pouring process of an epoxide resin insulation pouring piece for high-voltage appliances, comprising three procedures of material mixing, pouring and curing; firstly epoxide resin insulation pouring material is heated and evenly mixed in a vacuumized mixing bowl; then the mixed material is poured into a heated mould in a pouring tank, the pouring tank is vacuumized and the temperature of the pouring tank is equivalent to the temperature of the mixing bowl; under heating and pressuring, the mould is released after a primary curing, finally a corresponding secondary curing is carried out under heating, as the process of pressuring on pouring material is added in the primary curing, the obtained product eliminates or reduces sink marks and bubbles, and the insulation pouring piece finally obtained by curing has stable dimensional precision and excellent electric and mechanic properties.

Description

technical field [0001] The invention relates to a casting process of epoxy resin insulating castings for high-voltage electrical appliances, in particular to a vacuum pressure casting process. Background technique [0002] After entering the 21st century, China's national economy has entered a new period of high-speed development. Not only has the corresponding demand for electricity continued to grow rapidly, the electricity market is very prosperous, but also based on "power transmission from west to east, mutual supply between north and south, and national networking" and "building a strong According to the development strategy of "National Grid", my country's power grid construction is in a period of sustained and rapid development, and the development of million volts of high voltage is a major technical equipment policy in my country, which is being implemented. [0003] All this not only brings broad market opportunities to high-voltage switch manufacturers, but also g...

AI Technical Summary

Problems solved by technology

However, since the curing shrinkage of the castable material is unavoidable, and the material is injected into the mold in a natural state, unlike the APG process, the material is continuously injected into the mold through the runner under a certain pressure, which can be used in the mold cavity. Compensation for shrinkage, coupled with the constraints of various shapes of insulating parts, lead to sink marks and bubbles often appearing on the appearance of products produced by vacuum casting process, and for large insulating parts, the probability of defects such as sink marks and bubbles is greater

Sink marks not only directly affect the sealing performance of GIS fully enclosed combined electrical appliances, but also the electric field distribution on the surface of the insulating part will be distorted. Open air bubbles are likely to become the "gathering point" of various impurities, which will greatly reduce the reliability of GIS, and the impact is even worse for the insulating parts for miniaturized GIS.

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