External mold for pouring high-voltage winding of dry-type transformer

Abstract

The invention discloses an external mold for pouring a high-voltage winding of a dry-type transformer. The external mold comprises an outer mold of a circle body and an outer mold of a square block, wherein the outer mold of the circle body is an elliptic hoop which is bent by a steel plate; an opening is formed in one end of the elliptic hoop; the outer mold of the square block comprises two parallel steel plates and a fixed rack; the fixed rack is arranged between the two parallel steel plates; the two parallel steel plates adopt a long axis of the elliptic hoop as a symmetrical shaft, and are distributed at two sides of the symmetrical shaft; the two steel plates and the elliptic hoop are integrally bent and molded; the bending direction is toward the outside of the elliptic hoop outline; the elliptic hoop and the parallel steel plates are in smooth transition; the fixed rack is connected with the parallel steel plates through bolts; and the width of the fixed rack is smaller than the distance between the two parallel steel plates. The external mold has the beneficial effects that the external mold is applied to pouring of a high-voltage coil; the automatic demolding effect can be realized by dismantling the fixed rack after pouring is ended; and the outer mold is very convenient to dismantle.

Description

technical field [0001] The invention relates to a mold for processing dry-type transformer windings, in particular to a casting outer mold for high-voltage windings of dry-type transformers. Background technique [0002] When pouring the high-voltage winding of the dry-type transformer, the upper and lower ends of the inner mold and the outer mold are sealed and fixed, and epoxy resin is poured into the closed pouring gap to form an insulating shell. [0003] The high-voltage winding needs to be equipped with external connection terminals and voltage-regulating connection terminals. The structure of the high-voltage winding formed after casting is as follows: image 3 It includes an elliptical coil body 21 and a square block 22 formed by integral casting on one side of the coil body. The side wall of the square block 22 is provided with a terminal post 23 . [0004] The traditional high-voltage winding casting outer mold adopts two methods to form the outer contour of the hi...

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Problems solved by technology

[0004] The traditional high-voltage winding casting outer mold adopts two methods to form the outer contour of the high-voltage winding casting. One is to separate the outer mold into a coil body part and a square block part, and then weld or bolt the two parts. This method is more convenient for forming the coil body, but it has high requirements for the welding process. If there is a missing welding in the welding, there will be bumps or other irregular casting bumps during pouring, which need to be polished; the second method It is a closed steel mold that directly bends the steel plate with a square block, and then connects the two sides with bolts. Although this method is simple in workmanship, it is not easy to demould and reuse

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