RU2279150C1 - Method for producing polymeric case of vacuum circuit breaker - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: proposed method for producing polymeric case of vacuum circuit breaker includes installation of vacuum chamber in mold, locking of the latter, and chamber sealing followed by filling space between chamber and mold with liquid insulator. In the course of molding, prior to filling chamber-to-mold space with liquid insulator, external surface of chamber is covered with flexible shock-absorbing silicon rubber, epoxy compound being used as liquid insulator. Epoxy compound has following composition, parts by mass: epoxy resin, 100; filler, 360; hardener, 85; promoter, 1. Polymeric case is molded at mold temperature of 140 - 145 °C and pole molding time of 27-35 minutes, followed by hardening for 12 h at 140 °C.

EFFECT: facilitated procedure, reduced cost.

3 cl, 3 dwg

Description

The invention relates to high-voltage apparatus engineering, and in particular to a method for forming a polymer housing of a vacuum circuit breaker.

Known vacuum circuit breakers contain one or more vacuum interrupter chambers (VDK) operating in wide temperature ranges and various environmental pollution levels. The interrupter contacts of the VDK are placed in a vacuum and protected from the external environment by a cylindrical body made of insulating ceramics and glass [1]. A movable conductive contact with an insulating rod and connected to a drive lever, which is rigidly fixed to a preferably metal drive frame structurally constitutes the pole element of the vacuum circuit breaker. All vacuum circuit breakers must comply with GOST requirements for high voltage circuit breakers [2].

In the known design solutions of the poles of vacuum circuit breakers, the VDK poles can be installed between insulating posts (plates), for example, ed. testimonial. No. 601013 SU, or in transparent polymeric materials of the LEXAN type, for example, RF patent No. 2020631, or in cases made of polycarbonate and phenol-formaldehyde resins, for example Patent US No. 3,955,167, May 4, 1976, Patent US No. 4,124,790, Nov. 7, 1978, Patent GB No. 1,030,798, May 25, 1996, Patent DE No. 2240106 A, 1.03.1973, etc.

Known methods for manufacturing an arrester of a vacuum circuit breaker module filled with a hardening polymer include the method according to RF patent No. 2026581, which, by the totality of features, can be taken as a prototype for the proposed method for forming a polymer housing for a pole of a vacuum circuit breaker.

The prototype method of manufacturing an arcing module, first of all, provides, through the sealing units, to carry out the technological fixation of the chamber and the technological sealing of the module by tightening the sealing units, and this process is achieved in the lower part of the module by pouring a cured polymer - Vilad. The space remaining to the upper sealing assembly is filled with a liquid dielectric, which is used as an insulating liquid with a high viscosity - vinyl floor.

The use of these dielectrics, their melting, injection (supply), hardening, disassembling the installation, followed by cleaning them, etc. very difficult and expensive process. This is clearly seen from the installation cited in this patent.

The basis of the present invention is the creation of such a method of forming a polymer housing of a vacuum circuit breaker, which would eliminate the use of dielectrics for fixing and sealing the housing, while simplifying and cheapening the process as a whole.

The problem is achieved in that in the method of forming the polymer housing of the vacuum circuit breaker, comprising installing the vacuum chamber in the mold, fixing it and sealing the chamber, followed by filling the space between the chamber and the mold with a liquid dielectric, according to the invention, in the process of forming the housing before filling the space between the chamber and the mold by a liquid dielectric on the outer surface of the chamber establish an elastic shock-absorbing layer of silicone rubber, while in stve dielectric liquid epoxy compound is used.

In a preferred embodiment, the epoxy compound consists of the following parts by weight:

epoxy resin - 100 m.h.,

filler - 360 mph,

hardener - 85 m.h.,

accelerator - 1 mph

It is highly advisable that the formation of the polymer body was carried out with the following parameters:

mold temperature - 140-145 degrees C,

pole forming time - 27-35 min,

hardening conditions - 12 hours at a temperature of 140 degrees C.

The proposed method is much simpler and more technologically advanced than the method described in the prototype, and completely eliminates the use of both Vilad and vinyl floor. In the proposed method, the camera is fixed in the insulating casing and the pole is sealed by the mold, and not by chemical components such as Vilad and vinyl floor, as in the prototype, while this fixing and sealing is performed during the formation of the pole.

Other objectives and advantages of the present invention will become apparent from the following detailed description of an example of its implementation and the accompanying drawings, in which:

figure 1 depicts a block diagram of an installation for epoxy casting;

figure 2 - schematic diagram of the installation;

figure 3 - pole of the vacuum circuit breaker (the final product according to the proposed method of forming a polymer housing of the pole).

Installation for implementing the proposed method contains the following main parts: container 1 (figure 2) with epoxy components, drive 2 of the mixer, vacuum valve 3, dispensers 4, synchronizer 5, mixer 6 hardener components, mechanism 7 degassing of a thin ball, vacuum pump 8 , a mixer 9 of epoxy components, a drain valve 10, a buffer 11, a mold 12 of an injection machine and a container 13 with hardener components.

The embedded elements of the pole contain: a lower conductive contact 14 (Fig. 3), an upper conductive contact 15, a bolt 16 for attaching a vacuum arc extinguishing chamber (VDK), VDK 17, an elastic shock-absorbing layer 18 made of silicone rubber.

The elastic layer 18 prior to the casting process is tightly held on the surface of the vacuum chamber 17 due to the plastic spiral thread, which is removed before installing the VDK 17 in the mold.

Installation works as follows.

The preheated VDK 17 with the interlayer 18 is installed in the mold 12, into which the compound is automatically supplied using a special technological process. In the mixer 9 from the tank 1 is the supply of components of the epoxy resin. In the mixer 6 from the tank 13 is the supply of hardener components. Prepared working mixtures are pumped into two dispensers 4. The main function of the synchronizer 5 is to monitor the strict technological dosage of the components before feeding them into the dispensers. Mass parts (parts by mass) are adopted as follows: epoxy resin - 100 parts by mass, filler - 360 parts by mass, accelerator - 1 parts by mass. and hardener - 85 m.h. The prepared working mixture of the injection compound from the buffer pos.11 under a working pressure of 4-5 MPa (Megapascals) is fed into the mold 12.

In the molds 12, the final product is formed - the pole of the vacuum circuit breaker (figure 3).

The formation of the polymer pole of the vacuum circuit breaker is carried out at the following parameters: mold temperature - 140-145 degrees C., the time of forming the pole - 27-35 minutes, and the hardening conditions - 12 hours at a temperature of 140 degrees C.

Monitoring the time of filling the molds 12 and the crystallization time of the compound with the surfaces of the VDK 17 with the pressed parts of the upper and lower conductive contacts 14, 15 is carried out strictly with the requirements of the process. After opening the mold 12, the resulting pole of the switch is cooled, removed from the mold 12 and cleaned.

The extruded part freed from the inserts undergoes recrystallization according to the technological process. The cooled pole assembly is tested for mechanical and electrical strength.

Information sources

1. Evdokunin GA, Tiller G. Modern vacuum switching equipment for medium voltage networks. St. Petersburg: Publishing House Sizova S.P., 2002, - 148 p., With ill.

2. GOST 687-78. "AC circuit breakers for voltages above 1000 V. General specifications." Ed. standards. 1981

Claims (3)

1. A method of forming a polymer housing of a vacuum circuit breaker, comprising installing a vacuum chamber in a mold, fixing and sealing the chamber, followed by filling the space between the chamber and the mold with a liquid dielectric, characterized in that during the formation of the housing of the vacuum circuit breaker before filling the space between the chamber and the mold on the outer surface of the chamber (17) establish an elastic shock-absorbing layer (18) of silicone rubber, while the cured polymer is Olza epoxy compound. 2. The method according to claim 1, characterized in that the epoxy compound consists of the following components, parts by weight: Epoxy resin one hundred Filler 360 Hardener 85 Accelerator one 3. The method according to claim 1, characterized in that the formation of the polymer body is carried out with the following parameters: mold temperature - 140-145 °, pole forming time - 27-35 min., hardening conditions - 12 hours at a temperature of 140 ° C.

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