JPS63257146A - High voltage breaker - Google Patents

Abstract

In an electrical high-voltage power circuit breaker, the forces required for moving the switching contacts in the interruptor units (3) are transmitted via an intermediate transmission. One of the levers (4) of the intermediate transmission is supported via a bolt (5) in the housing (1). This bearing is intended to be designed such that as few processing steps as possible are required for precise lateral fixing of the lever (4). The bolt (5) used as the bearing of the lever (4) is borne in two side walls (9, 10) running parallel to an opening (6) in the housing (1), and has two regions (14, 19) of different diameter. The recess (20) between the two diameters is located in front of the rear side surface (21) of the front housing side wall (9) and, in the rear housing side wall (10), there is inserted a sleeve (15) whose end face (17) is located in front of the housing side wall (9) and, together with the recess (20) in the bolt (5), forms resting surfaces for the lever (4) of the intermediate transmission. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high voltage circuit breaker with an intermediate transmission mechanism.

[Prior Art] A case for an interrupting unit and an intermediate transmission mechanism is supported by a support insulator, and an operating device disposed on the ground side is provided with an operating rod made of an insulating material and a plurality of levers disposed within the support insulator. a high-voltage circuit breaker, in which the movable contact of each disconnection unit is actuated via an intermediate transmission mechanism, with one of the levers being supported via a pin in the case of the intermediate transmission mechanism; is known, for example from US Pat. No. 4,105,879. The pin for the bearing support of one of the levers of the intermediate transmission serves as a rotational fulcrum for the intermediate transmission.

Furthermore, the lever bearing supported on the pin must be precisely aligned in its position and is not allowed to move axially when a force is applied. This is because the movable contacts installed in the disconnection unit are not allowed to tilt under any circumstances. However, accurate alignment of the lever is possible only by machining the surface! However, the production of such a surface is very expensive in a cast aus due to its orientation.

[Problems to be Solved by the Invention] The present invention aims at reducing the intermediate transmission a so as to minimize the processing steps required for accurate lateral fixation of the lever.
The purpose is to configure the bearing support for the lever of the structure.

[Means for Solving the Problem] This object is based on the invention in a high-voltage circuit breaker of the above-mentioned type, in which two projecting walls extending parallel to each other are provided in the interior of the cast case for each intermediate transmission mechanism. , these projecting walls are placed behind an opening closed gas-tightly by the lid of the case, the seat of which also stands parallel to the projecting walls and has a length of 1M.
and a protruding wall extending at least substantially perpendicular to the longitudinal axis of the pin, an array of holes of equal diameter being provided in the protruding wall for receiving the pins, the pins having different diameters; The first of these regions, facing the lid, has a larger diameter equal to the diameter of the hole in the projecting wall.

The second range also has a smaller diameter equal to the inner diameter of the sleeve arranged in the rear projecting wall with an end face in front of the rear projecting wall, and the seat has a diameter of 9. tJS so that the step between is behind the front protruding wall.
A length in the range of 2 is chosen, this step and the end face of the sleeve forming the abutment surface for the lever of the intermediate transmission supported on the pin, the lid axially fixing the pin. This is achieved by

[Effect] The bearing support of the lever of the intermediate transmission is therefore introduced through an opening in the cast case of the intermediate transmission and supported in two parallel projecting walls which themselves stand approximately perpendicular to the longitudinal axis of the pin. This is done through a pin. For this purpose, these projecting walls have holes of the same diameter in a row, which diameter is equal to the larger diameter of the pin in the area facing the opening or the lid closing it, opposite to the lid of the pin. At the other end of the side, the pin has a smaller diameter range starting between both projecting walls, and the length of this range is such that the step between the compatible diameter ranges of the pin always extends beyond the front projecting wall. It is chosen to come behind the. A sleeve is fitted into the hole in the rear projecting wall, the inner diameter of the sleeve being equal to the diameter of the smaller pin;
One end surface of the sleeve is located in front of the rear projecting wall.

The shoulder on the pin and the end face of this sleeve form the abutment surface for the side surface of the lever, which is bearing-supported on the pin of the intermediate transmission, so that the lever is clearly fixed in the axial direction of the pin. There is. Therefore, no machining of the housing wall, in particular the side walls of the housing projecting wall, is necessary, but only drilling, which can be carried out from one side. Nevertheless, a precise alignment of the bearing-supported lever is ensured, and this alignment is not subject to change even when lateral forces occur.

The spacing between the two projecting walls of the case is greater than the thickness of a lever bearing-supported on the pin, which lever supports two flanged bushings in the hole for receiving the pin, and one of these bushings The end face of the bush contacts the shoulder of the pin, and the end face of the other bush contacts the front end face of the sleeve in the rear projecting wall. As a result, the sides of the lever can also be left unfinished. The flanged bushing is advantageously made of a hard-wearing plastic, such as that available under the trade name Teflon, which has a low f-f and is therefore slippery.

[Embodiment] Next, the present invention will be explained in detail with reference to drawings showing an embodiment of an intermediate transmission mechanism of a high voltage circuit breaker based on the present invention.

In a high-voltage circuit breaker, the housing l for the intermediate transmission is supported by a support insulator 2, only partially shown. The supporting insulator 2 houses an operating rod which is actuated by an operating device, the movements of which are respectively transmitted via an intermediate transmission to a re-shutoff unit 3, which is also only partially shown. The intermediate transmission mechanism consists of a plurality of mutually connected levers, of which one lever 4 is bearing supported in the case l via a pin 5. For this purpose, the housing 1 is provided with an opening 6 which is closed off in a gas-tight manner by a lid 7.

For this purpose, the lid 7 supports the gasket 8.

For the bearing support of the pin 5, two housing protruding walls 9,10 are cast into the cast housing 1 behind the opening 6, these protruding walls parallel to each other and to the lid 7. and extends substantially perpendicular to the longitudinal axis of the pin 5. In the projecting wall 9.10 there are arranged holes 1'l, 12 in a row, which in the area 14 indicated by the arrow on the side towards the cover 7 of the bearing pin 5 are also arranged in the direction of the arrow. have the same diameter 13 as indicated by. Rear case protruding wall 1
The hole 12 in 0 does not completely penetrate this wall, thus forming a blind hole. A sleeve 15 is fitted into this hole 12, which contacts the rear wall 16 of the blind hole on one side, the end surface 17 of the sleeve being in front of the front side wall 18 of the case projecting wall 10.

Above the pin 5 there is provided a second range of smaller diameter, indicated by the arrow 19, which has a larger diameter than the naturally tightest end of the pin 5. A step 20 is provided between the smaller diameter range 14 and the smaller diameter range 19.
is formed. Both this step 20 and the end face 17 of the sleeve 15 located behind the rear side wall 21 of the front case projecting wall 9 and the side wall 21 of the case projecting wall 9.
or to form a precisely defined abutment surface for the lateral fixation of the lever 4 of the intermediate transmission without the need for machining 18. In order to also avoid machining of the side walls of the lever 4. , this lever carries two collared bushings 23 and 24 in the area of the hole 22 for receiving the pin 5, the end faces of these collars each forming an abutment surface.

Such a device constructed according to the invention for the bearing support of the lever 4 of the booth transmission mechanism allows a precise lateral alignment of the lever 4 and prevents the pin 5 from moving in the axial direction. 0M requiring only the production of aligned holes in the case projecting wall 9.10 for bearing support.
This ensures a gas-tight closure of the opening 6 in the case l and at the same time fixes the pin 5 in its position.

[Brief explanation of the drawing]

FIG. 1 is a side view including a partial cross section of an embodiment of the intermediate transmission mechanism of a high voltage circuit breaker based on the present invention, and FIG. 2 is a partial cross sectional view of the mechanism shown in FIG. . l...case? ... Support insulator 3 ... Shutoff unit 4 ... Lever 5 ... Pin 6 ... Opening a ... Lid 9, 10 ... Projection wall 11.12.22 ... Hole 15. ...Sleeve 20...Step part 23.24...Bullet beak 1

Claims (1)

[Claims] 1) The interrupting unit and the case for the intermediate transmission mechanism are supported by a support insulator, and the operating device disposed on the ground side is an operating rod made of an insulating material and arranged in the support insulator. The movable contact of each disconnection unit is actuated via an intermediate transmission mechanism consisting of several levers, one of the levers being supported via a pin in the case of the intermediate transmission mechanism. In the voltage circuit breaker, two projecting walls (9, 10) extending parallel to each other are provided inside the cast case (1) for each intermediate transmission mechanism, and these projecting walls are connected to the case (1). The lid (7) is placed behind the opening (6) which is closed in a gas-tight manner, with the lid (7) also standing parallel to the projecting walls (9, 10) and connecting the lid (7) with the projecting walls (9, 10). 9, 10) extending at least approximately perpendicular to the longitudinal axis of the pin (5), and provided with aligned holes (11, 12) of the same diameter (13) in the projecting wall (9, 10). ,
These holes receive pins (5) which are divided into two regions (14, 19) with different diameters, the first of these regions facing the lid (7). Range (1
4) has a larger diameter (13) equal to the diameter of the holes (11, 12) in the protruding walls (9, 10) and the second
The range (19) is a smaller one equal to the inner diameter of the sleeve (15) arranged in the rear projecting wall (10) with an end face (17) in front of the rear projecting wall (10). The length of the second region (19) is selected in such a way that the step (20) between the different diameters lies behind the front projecting wall (9); (20) and the end face (17) of the sleeve (15) form the abutment surface for the lever (4) of the intermediate transmission supported on the pin (5), and the lid (7) 5) A high voltage circuit breaker characterized by being fixed in the axial direction. 2) The distance between the two protruding walls (9, 10) of the case (1) is greater than the thickness of the lever (4) bearing supported on the pin (5), and this lever (4) Two flanged bushes (23, 24) are supported in the housing hole (22), and the end surfaces of these bushes are aligned with the step (20) of the pin (5) and the rear protruding wall (10), respectively. Circuit breaker according to claim 1, characterized in that it contacts the end face (17) of the inner sleeve (15). 3) The circuit breaker according to claim 2, characterized in that the flanged bushings (23, 24) are made of a low-friction, low-wear, heat-conducting plastic. 4) Claim characterized in that the hole (12) in the rear projecting wall (10) is configured as a blind hole, and the sleeve (15) rests on the rear wall (16) of this hole (12). The circuit breaker according to 1 or 2.