UA5107U - Method of producing the polymer casing of a vacuum circuit breaker - Google Patents

Abstract

The proposed method of producing the polymer casing of a vacuum circuit breaker by using molding equipment is distinctive by that epoxide compound is used for producing the casing and a resilient shock-absorbing layer of silicone rubber is provided between the inside surface of the casing and the outside ceramic surface of the vacuum arc-chute as well as the surfaces of the metallic parts of the circuit breaker.

Description

A useful model for the method of forming the polymer body of the pole of a vacuum switch relates to the field of high-voltage apparatus construction, in particular to vacuum high-voltage switches.

Known vacuum circuit breakers have one or more vacuum arc extinguishing chambers (VDK) in their composition. Such cameras work in wide temperature ranges and in environments with different levels of pollution. The arc extinguishing contacts of the VDK are placed in a vacuum and protected from the influence of the external environment by a cylindrical body made of insulating ceramics and glass (1). A movable current-conducting contact with an insulating rod is connected to the lever and rigidly fixed on the mostly metal frame of the actuator structurally constitutes the pole element of the vacuum switch. All vacuum switches must meet the requirements of GOST for high-voltage switches (21.

In generally known constructive solutions of the poles of vacuum switches, the VDC of the poles can be placed between insulating racks (plates), e.g. Auth. certificate Meb01653 5), 23.10.90, Byul. Me39, or in transparent polymer materials of type I EHAM, e.g. patent of the Russian Federation Mo2020631, 20.09.94, Bull. Mo18, or in cases made of polycarbonate or phenol-formaldehyde resins, e.g. Raiepi 05 Me3,955,167, Mau 4, 1976; Raiepi 05

Me4,124,790, Mom. 7, 1978; Raiepi SV Me1,030,798, Mau 25,1996; Raiepi OE Me22 40 106 A, 11.03.1973 and others.

Known methods of manufacturing the arc-extinguishing module of a vacuum circuit breaker filled with a hardening polymer include the method according to the RF patent Meo2026581 C1, 10.01.95 Byul.Me1, which, if there are signs, can be taken as a prototype for the proposed method of forming the polymer body of the pole of a vacuum circuit breaker.

The method of manufacturing an arc extinguishing module, taken as a prototype, first of all involves the technological fixation of the camera and the technological sealing of the module by pressurizing the sealing nodes, and in the lower part of the module, this process is achieved by pouring a hardening polymer - vilad.

The basis of the proposed method of forming the polymer body of the vacuum switch pole is the task of achieving such parameters (ratio of mass parts) of the working mixture from the epoxy compound, which, in combination with the corresponding parameters, modes of formation and hardening, the temperature of laying the elastomer in the molds, etc. would make it possible to achieve the final result, that is, the body of the isolating pole of the switch with high electrical characteristics, a high level of protection against pollution and mechanical damage, with improved grafting during casting, with compensation of the relative movement between the internal insulating surfaces of the body made of epoxy compound and the insulating segment of the ceramic surface of the VDK.

As insulation of the ceramic surface of the VDK from the epoxy compound (which includes an epoxy resin, a hardening component, a filler and an accelerator), an elastic shock-absorbing layer in the form of a sleeve made of silicone rubber (or ethylene-propylene-dyne rubber, or propylene-mastic, or mesh polyethylene), which tightly squeezes the outer surface of the VDK.

The task is solved by the fact that the elastic shock-absorbing layer, even before the casting process, is firmly held on the surface of the vacuum chamber due to the plastic spiral thread, which before installation

VDK in the press form is removed. The pre-heated VDC, with an elastic shock-absorbing layer, is placed in a mold into which the compound is automatically injected using a special technological process. Control of the time of filling the mold and the time of crystallization of the compound with the surfaces of the VDK and with the pressed parts of the upper and lower conductive contacts takes place strictly in accordance with the requirements of the technical process. After disconnecting the mold, the resulting pole of the switch is placed on the table for cooling, disassembly, and cleaning of the coating. The pressed part freed from the inserts is re-crystallized according to the technological process. The cooled pole assembly is tested for electrical and mechanical strength in accordance with the requirements of regulatory and technical documentation.

So, the method of forming the polymer body of the vacuum circuit breaker pole in the equipment for casting from epoxy compound, which includes a mixer for resin components, a mixer for hardening components, a dispenser, a static mixer and machines for casting into pole molds is that in order to obtain a pole from with high electrical properties, a surface resistant to pollution and mechanical damage, the epoxy pole is made of an epoxy compound, in which the mentioned upper and lower conductive contacts and a vacuum arc extinguishing chamber are embedded elements. To improve grafting during casting and compensate for the relative movement between the inner insulating surface of the epoxy compound case and the outer insulating segment of the ceramic surface of the vacuum arc extinguishing chamber, metal parts and casting resin, an elastic shock-absorbing layer of silicone rubber is applied. In addition, the mixture of the epoxy compound consists of the following mass parts (m.h): epoxy resin - 100 m.h., hardening component - 85 m.h., filler - 360 m.h., accelerator - 1 m.h. The working mixture is fed into the mold at a working pressure of 4-5 Mpa (Megapascals). The technological regime is determined by the following parameters: the temperature of the press mold is 140-145 degrees Celsius, the time of pole formation is 27-35 minutes, and the hardening conditions are 12 hours at a temperature of 14 degrees Celsius.

Figure 1 shows a block diagram of devices (equipment) for epoxy casting;

Fig. 2 is a structural diagram of the equipment;

In Fig. 3 - the pole of a vacuum switch (the final product according to the proposed method of forming the polymer body of the pole of a vacuum switch).

In accordance with the proposed method of forming the polymer body of the pole, the equipment consists of the following main parts (devices): container with epoxy resin components pos. 1 (Fig. 2), mixer drive pos. 2, vacuum valve pos. 3, dispenser pos. 4, synchronizer pos. 5, mixer of hardening components pos. 3z.b, thin layer degassing mechanism pos. 7, vacuum pump pos. 8, mixer of epoxy resin components pos. . 10, buffer pos. 11, mold casting machine pos. 12 and containers with hardening components pos. 13.

In the mixer pos. 9 (Fig. 2) from the container pos. 1 injection of hardening components is carried out. The prepared working mixtures are pumped into dispensers (two of them) item 4. The main function of the synchronizer pos. 5 to monitor the technological dosing of components before feeding them into the dispenser. Mass parts (m.h.) are taken as follows: epoxy resin - 100 m.h., filler - 360 m.h., accelerator - 1 m.h. and the hardening component - 85 m.h.

The prepared working mixture of the casting compound from the buffer item 11 under a working pressure of 4-5 MPa is fed into the mold item 12.

The final product is formed in the molds - the pole of the vacuum switch (Fig. 3).

The main elements of the pole are: the lower conductive contact pos. 3z.14 (Fig. 3), the upper conductive contact pos. 15, the bolt for attaching the vacuum arc extinguishing chamber (VDC) pos. 16, the vacuum chamber pos. 17, the elastic shock-absorbing layer of silicone rubber pos. 18.

Basic elements of the pole in the mold are filled with epoxy compound item 19 (Fig. 3), and using the proposed method, form the final product - the pole of the vacuum switch.

Using the achieved technological parameters, in the proposed method of forming the polymer body, it was possible to obtain a high-tech and constructively workable pole of a vacuum switch at Rivne High-Voltage Equipment Plant (Ukraine, Rivne).

Polymer housings manufactured according to the proposed method are successfully used as part of many series of high-voltage vacuum switches in the national economy of Ukraine and the CIS countries.

Sources of information 1. Evdokunin G.A., Tyler H. Modern vacuum switching technique for medium voltage networks. St. Petersburg: S.P. Sizova Publishing House, 2002, - 148 p., with illustrations. 2. GOST 687-78. "Alternating current switches for a voltage higher than 10008. General technical vocabulary".

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Claims (3)

1. The method of forming the polymer body of the vacuum switch in the equipment for casting from an epoxy compound, which includes a mixer for resin components, a mixer for hardening components, a dispenser, a static mixer and machines for casting into pole molds, which is distinguished by the fact that for obtaining a pole with high electrical properties, a surface resistant to contamination and mechanical damage, the pole is cast from an epoxy compound, in which to improve adhesion during casting and compensate for the relative movement between the inner insulating surface of the housing and the outer insulating segment of the ceramic surface of the vacuum arc extinguishing chamber, metal parts and casting resin use an elastic shock-absorbing layer of silicone rubber. 2. The method according to claim 1, which differs in that the composition of the epoxy compound in parts by mass (m. parts) is as follows: epoxy resin 100 filler 360 hardening component 85 accelerator 1. 3. The method according to claim 2, which differs in that the technological mode of casting is determined by the following parameters: mold temperature 1400-1459 pole formation time 27-35 minutes 12 hours. under the condition of hardening at a temperature of 14052,