SU1089659A1 - Vacuum circuit breaker - Google Patents

Abstract

1. A VACUUM SWITCH containing an insulating case in which a vacuum arcing chamber is installed with flanges on which movable and fixed arcing contacts are mounted, conductors installed in the openings of the lateral surface of the body. and connected to said flanges, characterized in that. In order to increase reliability and reduce dimensions by improving the design of the fixing unit of the vacuum Arc-suppressing chamber in the switch, a metal element in the form of a slit hollow cylinder, which is wedged in the housing by means of a spacer element, is additionally inserted into the body of the fixed contact conductor. -, but a tapered bolt, and electrically connects the chamber with the conductor. 2. The switch according to claim 1, about tl and the fact that on the inner surface of the case there is an annular protrusion into which the cushion is (L is said metal element. 3, The switch according to claim 1, about t is the fact that In the plane of the moving contact conductor, a metal element in the form of a cut cylinder is additionally installed, which is wedged in the casing 00 by means of a spacer element and electrically connects the chamber with the cop: a wire.

Description

The invention relates to electrical engineering, and specifically to vacuum circuit breakers.

Vacuum circuit breakers are known, whose arc chambers are mounted on racks using bushing insulators through which current conductors are passed. Inter; 1 phase insulation of such air switches ij.

 These switches can be applied only at relatively low voltages (up to 10 kV) due to the low electrical strength of the air insulation.

Vacuum circuit breakers with combined air-solid dielectric insulation are also known. In such switches, the chamber, the conductors and the drive of each nojnoca are completely filled with epoxy compound forming a common pole sheath. Due to the greater electrical strength of the combined insulation, the dimensions and weight of the switch decrease dramatically 2.

However, the continuous solid-molded shell of this switch SUR-: makes it difficult to adjust it and makes it impossible to replace the cameras that were out of operation, for example, after a resource has been developed.

The closest in technical essence and the achieved result to the proposed is a vacuum switch containing an insulating case, in which a vacuum arcing chamber with flanges is mounted, on which mobile and fixed arc contacts are mounted, current-guided | on the side of the housing and connected to the specified flanges.

In addition, the flange of the fixed Ovontakt of the chamber is connected to a bracket made of an insulating material fixed on a threaded metal ring. To enhance the internal insulation of the switch, the housing cavity can be filled with pressurized gas.

To ensure the tightness of the switch, the housing is plugged with a bolt mounted directly on the insulating bracket. The advantage of this switch is the possibility of easy camera replacement.

and adjusting the switch during operation h.

A disadvantage of the known switch is the occurrence of shock loads that are transmitted directly to the sealing cap, as a result of which a switch may be depressurized during the long-term operation. In addition, shock loads are transmitted through the insulating arm to the ring, which is fastened with a thread on the insulating body. It is known that the mechanical strength of 5 threaded joints of metal parts with insulating parts is relatively low due to the low strength of insulating materials for cutting along thread coils, as well as due to the presence of backlashes in the thread. It is possible to increase the strength of this connection by increasing the length of the thread, but this leads to an increase in the overall dimensions of the switch,

5 The purpose of the invention is to increase the reliability and reduce the size by improving the design of the mount of the arcing chamber in the switch.

0 The goal is achieved by the fact that in a vacuum switch containing an insulating body in which a vacuum arcing chamber with flanges is installed, on which 5 fixed and fixed arcing contacts are extinguished, conductors installed in the openings of the lateral surface of the body and connected to the indicated flanges, inside the body Q coaxially with it in the plane of the conductor of the fixed contact, a metal element is additionally introduced in the form of a slit hollow cylinder, which is wedged into the body with the help of 2 aspornogo element, preferably conical bolt, and electrically connects the chamber with the current lead.

In addition, on the inner cylindrical surface of the housing can be made an annular protrusion, in

which abuts against said metallic element.

In this case, a metal element in the form of a slit hollow cylinder, which is wedged into the housing with the help of a spacer element and electrically connects the chamber with the conductor, is additionally installed in the plane of the conductor of the movable contact.

FIG. 1 shows the pole of a vacuum switch, a longitudinal section; and FIG. 2 shows a section A-A in FIG. 1, and FIG. 3 shows a section BB in FIG. 2.

The switch pole contains a vacuum arcing chamber 1 with a fixed contact flange 2 and a moving contact flange 3, spaced in a cylindrical insulating housing 4, conductors 5 and 6, respectively connected to the flanges of fixed and moving contacts, as well as a metal part 7 having the form open cut hollow cylinder and wedged in the body 4 by means of a cone bolt 8. The withdrawal from the movable contact is made by means of flexible connections 9.

An annular protrusion 10 is formed on the inner cylindrical surface of the housing 4, on which etal 7 abuts.

A second metal part 11, which has the form of an open hollow cylinder and is wedged in the body 4 with a tapered bolt 12, is mounted to fasten the movable contact conductor 6 to the switch. The movable contact of the chamber is connected to the actuator 13 through a system of levers and pull, including insulating cable 14. Leak tightness the switch body is provided with a movable seal on the shaft 15, which passes through the wall of the mechanism body 16 and the cover 17.

The pole pole is assembled in the following sequence.

Item 7 is installed in the housing 4 until it stops in the annular protrusion 10. The conductor 5 is screwed into the threaded hole of the part 7 until it stops. Twisting the tapered bolt 8, wedge the part 7 in the case 4, and then install the camera I with the flexible connections 9 fixed on it and fix it on the part 7 by any known method, for example using bolts. Then install the part 11, wrap the conductor 6 in it, wedge it with a cone bolt 8 and connect the levers and so on. The assembly operation is completed by installing the cover 17.

The switch works as follows. in a way.

The activation is carried out by the drive 13 through a system of levers and tons. Shock loads that occur at the time of contact closure in the chamber are transmitted through the camera body 1 to the fixed contact flange 2 to the part 7, and through it to the body 4. Part of the shock load perceives the annular protrusion 10. Optional

The metal part installed inside the insulating body is simultaneously carrier for the camera and conductor and allows to transfer the shock loads arising from the switch operation directly through this part to the body. This relieves the sealing valve from mechanical stress and thereby improves the reliability of the proposed switch.

The reliability of the vacuum circuit breaker is also enhanced by the fact that shock loads are not transferred to the housing through a threaded connection.

metal is an insulating material having low mechanical strength, and through a metal part tightly wedged inside the insulating body. Perform this detail

in the form of an unclosed hollow cylinder, it allows it to be reliably wedged out by means of a spacer element, such as a tapered bolt. Direct transfer of shock loads

through this part on the body allows to simplify the design of the proposed switch (by reducing the number of parts), since this part combines the functions

supporting insulating bracket and threaded outer ring known switch. In addition, the elimination of the outer ring allows the radial dimensions of the vacuum switch to be reduced.

The introduction of an additional metal element inside the housing in the plane of the COMBINED camera contact conductor, installed and wedged similarly to the specified part, allows simplifying the manufacture and assembly of the proposed switch through the use of standardized parts and assembly methods, as well as increasing its reliability during repeated insertions the switchgear cell due to the fact that the fastening of the current-carrying conductor of the movable contact is significantly strengthened.

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Claims (3)

1. VACUUM CIRCUIT BREAKER, comprising an insulating casing in which a vacuum arcing chamber is installed with flanges on which movable and fixed arcing contacts are mounted, conductors installed in the openings of the side surface of the casing. and connected to the indicated flanges, characterized in that, in order to increase reliability and reduce dimensions by improving the design of the attachment point of the vacuum interrupter chamber in the switch, a metal element in the form of a cut hollow cylinder is coaxially aligned with it in the plane of the fixed contact conductor, which is wedged in the casing with the help of a spacer element, mainly, but a conical bolt, and electrically connects the chamber to the current lead. 2. The switch according to claim 1, which is characterized in that an annular protrusion is made on the inner surface of the housing, against which said metal element abuts. 3. The switch according to claim 1, wherein the metal element in the form of a cut cylinder is additionally installed in the plane of the current path of the movable contact, which is wedged in the housing with a spacer element and electrically connects the camera to - piping. >