DE1590360A1 - Electrical switching device - Google Patents

Description

DIPL-ING. CURT WALLACH DR. TINO HAIBACH

8 Munich 2, September 29, 1966 10548 - K / vM

The English Electric Company Limited, London, England.

Electrical switching device

The invention relates to an electrical switching device.

According to the invention, the movable contact is a vacuum switch compared to the housing by Balgaiod.dgl. sealed and this one movable contact is moved between an open position and a closed position by fluid pressure that on the bellows or the like. is exercised.

Some exemplary embodiments of the invention are described below with reference to the accompanying drawings. In the drawing demonstrate:

Fig. 1 is a section of a first embodiment of an inventive Vacuum switch,

Pig. 2 shows a sectional view of a second corresponding to Pig Embodiment of the invention,

Pig. 3 the arrangement of several vacuum switches according to Pig. 2, which are connected in series,

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Fig. 4 shows an arrangement with several vacuum switches according to Pig.2 in series connection.

According to Pig.l, the vacuum switch has a housing with a cylindrical Insulator 11, on the two end faces of which end caps 12 and 13 are placed, which in turn carry end plates 14, 15, which are sealed against these caps. The inside of the housing is under a high vacuum.

The one end plate 14 carries a fixed contact 16, the outside of the housing is connected to a terminal.

The moving contact 18 is in the middle of the other face plate 15 arranged and connected to this via a flexible metal bellows 19, which is located between the end plate 15 and a splash 27 of the contact pin extends. The bellows? 9 together with a Part of the face plate 15 * the puddle 27 and a final housing cap 20 a closed chamber 21 which is fed with an insulating liquid via a pipe 22 made of insulating material. The liquid, e.g. transformer oil, serves two purposes: first, the increase in liquid pressure causes a closure of the contacts and a drop in fluid pressure enables the contacts to open; second, the liquid does one Damping of vibrations that can occur in such bellows and reduce their service life.

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The opening of the contacts when the fluid pressure drops is ensured by a tension coil spring 2j5 that is inside of the hollow movable contact 18 and attached on the one hand to this and on the other hand to the housing end 20 is. A sliding connection via elastic fingers 24 is provided between the movable contact 18 and the end housing 20, which serves both to guide the contact and also to conduct electricity to the terminal 25 of the end housing 20.

The usual shields 26 are provided around the insulator 11 to protect against metal deposits, which are a consequence of the arc between the contacts 16,18 ..

During operation, a pressure increase is generated in the chamber 21 by suitable means (not shown in the drawing), for example by a valve which controls the admission of liquid under pressure to the pipe 22. An increase in pressure ^{causes the bellows egg} ? 9 to expand, so that the movable contact 18 is brought into contact with the fixed contact 16.

The vacuum switch shown in Figure 2 is similar in many ways the vacuum switch according to Fig.l and corresponding parts are identified by the same reference numerals. The vacuum switch according to Figure 2, however, has two breakers in series. Instead of a single face plate 15, the movable contact 18 and connected to a terminal 25 are two end plates 15A of a pair of identical vacuum switching units

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connected to one another via a cylindrical electrical conductor 28 and the two movable contacts 18A are electrically connected "back to back". The moving contacts 18A are connected to the end plates by bellows 19A and the bellows form together with the end plates 15A and the conductor 28 one closed chamber 21A. This is the same with liquid <f Way fed as described with reference to Pig.l was through a pipe 22A made of insulating material and the Opening force is generated by a tension spring 2J5A, which is stretched between the hollow movable contacts I8A. The moving ones Contacts are interconnected by a finger-type jumper link 24A that is symmetrical by interconnection are arranged with the conductor 28. Instead, two tension springs can be placed between a central body, e.g.

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Conductor 28 is carried and the movable contacts 18A are provided be.

The mode of operation is the same as in the embodiment according to Fig. 1, i.e. when a pressure is applied to the chamber 21A through the tube 22A come the movable contacts I8A in Contact with the fixed contacts 16 and when the pressure drops, the spring 2J5A causes both pairs of contacts to open.

The contacts 16, 18, 18A can be of any known or suitable shape. Preferably, the contacts 16 can be elastic be stored. It would be useful to apply a spring force.

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see which brings the two contacts into contact. It is however, it is difficult in practice to provide a spring between the pad 27 and the head of the movable contact 18.

According to FIG. 3, several vacuum switches are connected in series according to FIG. terminal I7 of a switch with terminal 25 of the next one is connected. The tubes 22 of each switch are connected to a common feed line 29 to all of the switches to be operated at the same time.

FIG. 4 shows two vacuum switches configured according to FIG. 2 and connected one behind the other, two terminals 17 being connected by a conductor 30. The free terminals 17 of the two switches are used for connection to an external circuit. The lines 22A are connected to a common feed line J> 1 .

Instead of the bellows 19, 19A shown in the drawing suitable equivalent constructions can be provided, e.g. superstructures with flexible metal bellows or membranes.

Claims t

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Claims (6)

Patent claims: 1.Electric vacuum holder with a moving contact, the like in a housing by Belgenod. is sealed, characterized in that the movable contact (l8) is between the open position and the closed position is moved by a fluid pressure that the bellows (19) or the like. is fed. 2. Vacuum switch according to claim 1, wherein two movable contacts are provided, each in a corresponding one evacuated housing by means of bellows or the like. are sealed and these movable contacts at adjacent ends of the evacuated Housing lying, characterized in that the two movable contacts (I8A) are moved simultaneously between the open position and the closed position by a fluid pressure applied to the ^{6 bellows.} 3. Vacuum switch according to claims 1 or 2, characterized in that the evacuated housing has an end plate (15) with a central opening, that the bellows ^e ^ 19) is attached to the end plate (15) around the central opening, that the Bellows is attached to the movable contact (l8), which has a stem opposite a solid, electrically conductive 009816/0897 * ^A Component (24) is movable, that a terminal of the vacuum switch is electrically connected to this component (24) and that one closed chamber (21) is provided, which is limited by the bellows in part and which is filled with an insulating liquid . is filled. 4. Vacuum switch according to claim J>,
characterized in that a closure housing (20) is fixed on the end plate (15) and the electrically conductive component (24) and forms part of the wall of the chamber (21.). 5. Vacuum switch according to claim 4,
characterized in that resilient, current-carrying fingers (24) are provided at the end of the housing which are in contact with the stem of the contact. 6. Vacuum switch according to one of the preceding claims, characterized in that that the movable contact (18) and the housing are connected by a spring (25), that the movable contact is in the closed position is transferred by increasing the fluid pressure and that * ör is brought into the open position by the spring (23) will. 009816/0897