CN104550549A - Method for manufacturing container component of sealing type switch device, and switch device - Google Patents

Abstract

The invention relates to a method for manufacturing a container component of a sealing type switch device, and a switch device. According to the invention, a method for manufacturing container components (6,20,21) of a sealing typoe switch device is provided. The method requires low cost. Pressure-bearing capability of teh container components are remainded; the method comprises structuring a cylindrical pipe (2,12) via welding between a rolling sheet (1,7) and abutted-sides (3,13) of the rolling sheet (1,7), and bending a flange (5,16,17) on at least one pipe end part (4) of the cylindrical pipe (2,12).

Description

Method for producing a container part of a sealed switchgear and sealed switchgear

technical field

The invention relates to a method for producing a container part for a sealed switchgear.

Background technique

In methods known from the prior art for manufacturing vessel parts of sealed switchgear, such as gas-insulated medium-voltage switchgear filled with SF6 as Sealed switchgear for power distribution in the high and high voltage field consists of such cast containers. Typically, aluminum is used as a material for this. Such a hermetic switchgear consisting of such an aluminum container is not only material-intensive but also expensive.

Contents of the invention

The technical problem addressed by the invention is to provide a cost-effective method for producing a container part of a sealed switchgear with an approximately constant pressure resistance.

According to the invention, the above-mentioned technical problem is solved by a method for manufacturing a container part of a sealed switchgear comprising the following steps:

- construction of cylindrical tubes by rolling sheets and welding along the butt edges of the rolled sheets,

- deflection bending of a flange at at least one tube end of said cylindrical tube.

In this way, a container part can be constructed simply, which can be joined with other container parts produced in the same way to form a sealed switchgear, wherein the deflected flanges on the cylindrical tube are fixed to each other by means of a sealing element or such The container part can be welded to the other container part eg at the non-flange end on the other container part. By using the method of simple sheet metal, the method according to the invention is therefore less expensive and requires less material than casting methods, which likewise leads to cost advantages for such container parts. The deflection of the flange in the sense of the present application is here a method in which by means of two rollers on a cylindrical tube clamped on a rotating device (which itself is placed in rotation), the two rotating rollers Acts on the pipe wall, i.e. one roller is arranged outside the pipe wall and one roller is arranged inside the pipe wall, where the two rotating rollers are deflected together about a point of rotation so that the roller arrangement is deflected by 90° relative to its original position In this case, the tube wall of the cylindrical tube is bent or also referred to as "deflected" and a flange is formed. The deflection process can be carried out multiple times or also with different roller profiles, so that material reinforcement or flange thickening can also be achieved after deflecting a simple flange, for example by means of an arrangement with two rollers. This deflection process thus ensures a simple and cost-effective configuration of the flanges on such tubes or container parts of the sealed switchgear.

In a further refinement of the invention, before or after forming the cylindrical tube, the sheet metal is provided with openings which are formed into tube sockets by means of the journaling method. By providing openings in the sheet metal before or after forming the cylindrical tube, for example by stamping or by laser machining, it can be achieved in a simple manner: after forming the cylindrical tube at these openings the tube is formed by a journaling process Seats, so that compact T-shaped container parts for sealed switchgears and cross-shaped container parts for switchgears can thus also be formed. The journaling of the socket on the container part is carried out in such a way that a substantially oval shaped part is stretched or extruded through the existing opening in the cylindrical tube, wherein the oval The semi-major axis is greater than the diameter of the opening so that the stem is formed by a drawing or extrusion process. It is then possible to easily weld another container part on such a base, for example a tube with a welded flange, on its end which is not provided with a flange.

In a further preferred embodiment of the method according to the invention, additional openings are provided in the sheet metal for gas-tight fixing of the switching device component. Other switching devices, such as feed-throughs, switching contacts, etc., can be easily fixed gas-tight to the formed container part by providing other openings in the sheet material processed into the container part, for example by welding, soldering or Bonding etc.

Furthermore, the invention relates to a sealed switchgear with at least two container parts, which is produced with the method according to one of the above-mentioned exemplary embodiments, characterized in that between the flanges of the two container parts An O-ring retained by the back-up ring is provided for an airtight seal.

Such a hermetically sealed switchgear can be produced simply and cost-effectively, since the container parts produced with the above-described production method and the gas-tight sealing between the flanges of these container parts by means of O-rings held by the support ring can be used cost-effectively components, and the stability and withstand voltage capability of the switchgear are also sufficient.

Description of drawings

The invention is explained in more detail below with reference to the drawings and exemplary embodiments with reference to the accompanying drawings. In the attached picture:

Figure 1 shows the manufacture of a container part for a sealed switchgear;

Figure 2 shows the manufacture of another container part for a sealed switchgear; and

Figure 3 shows the manufacture of a cross-shaped container part for a sealed switchgear.

Detailed ways

FIG. 1 shows a sheet metal 1 for the production of a container part of a sealed switchgear, which is rolled into a cylindrical tube 2 in a first method step, which is welded at butt edges 3 . At the first end 4 a flange 5 is then formed by deflection. For this, the cylindrical tube 2 is fixed in a rotating device and rotated about its central axis. Two rollers, which likewise rotate about their axes, are arranged on the cylindrical tube 2 in such a way that one of the two rollers rests against the outside and the other against the inside of the cylindrical tube 2 . The two rollers are arranged so as to be pivotable about a common point of rotation and are then pivoted outwards by 90°, so that a bead 5 is formed on the first end 4 of the cylindrical tube 2 . The thickness and the contour of the flange 5 can be varied here by repeated repetitions or by correspondingly changing the contours of the two rollers, so that a material-reinforced flange can also be formed by deflection.

FIG. 2 shows a further housing part 6 in a different method step. The sheet 7 has openings 8 , 9 , 10 and 11 which have been made in the sheet 7 before the sheet 7 is rolled into the cylindrical tube 12 , for example by a stamping process. The sheet 7 is rolled into a cylindrical tube 12 and welded at butt edges 13 . In a subsequent method step, the flanges 14 and 15 are arranged at the end 16 or 17 of the cylindrical tube 12 by the deflection method already described above. In the next method step, the socket is formed by journaling at the opening 8 or 9, wherein the cylindrical tube 12 is clamped in a device and a circular tube is pressed or stretched through the opening 8 or 9. The shaped part, so that the socket 18 or 19 is formed from the opening 8 or 9 . The other housing part 6 can thus be used as a base body for a cross-shaped container part for a sealed switchgear, wherein, as can be seen with reference to FIG. And the container part 20 or 21 is produced, for example, as described with reference to FIG. 1 . Other container parts in the form of flange tubes 22 or in the form of penetrations 23 or 24 or in the form of ground contacts 25 can be fastened to other housing parts 6 in a gas-tight manner, for example by welding, soldering or gluing, so that the sealing Pressure requirements for gas-insulated switchgear.

The manufacturing method described above enables simple and cost-effective production of compact container parts for sealed switchgear, for example for gas-insulated medium-voltage switchgear or high-voltage switchgear, which are typically supplied with _SF6 as insulating gas Filling, since with the use of less material it is possible to form compact and gas-tight containers, which are gas-tightly connected to one another at their flanges by O-ring seals held by support rings.

List of reference signs

1 plate

2 cylindrical tube

3 butt edge

4 first end

5 flange

6 Other housing parts

7 plate

8 to 11 openings

12 Cylindrical tube

13 butt edge

14, 15 Tube ends

16, 17 flange

18, 19 Tube holder

20, 21 container parts

22 Flange tube

23, 24 Penetrations

25 Ground contact.

Claims (4)

1. A method for manufacturing a container part (6, 20, 21) of a sealed switchgear comprising the steps of: - construction of cylindrical tubes (2, 12) by rolling sheets (1, 7) and welding along butt edges (3, 13) of the rolled sheets (1, 7), - deflection bending of the flange (5, 16, 17) at at least one tube end (4) of said cylindrical tube (2, 12). 2. The method according to claim 1, characterized in that the sheet (1, 7) is provided with openings (8, 9) before or after the construction of the cylindrical tube (2, 12), the Said openings form the sockets (18, 19) by means of journaling. 3. The method according to claim 1 or 2, characterized in that additional openings (10, 11) are provided in the sheet metal (1, 7) for gas-tight fixing of switchgear components (23, 24 , 25). 4. A sealed switchgear having at least two container parts (6, 20, 21), which are manufactured using a method according to any one of claims 1 to 3, It is characterized in that an O-ring seal held by a support ring is arranged between the flanges (16, 17) of the two container parts for an airtight seal.