DD244439A1 - VACUUM SWITCH CHAMBER FOR LOW VOLTAGE VACUUM SHOULDERS - Google Patents

Abstract

The invention relates to a vacuum switching chamber for low-voltage vacuum protection, in particular for use under severe electrical and mechanical operating conditions, but for small Nennstroeme. The aim of the invention is a vacuum switching chamber with a high performance at low production costs through rational production. The object is to provide a vacuum switching chamber for small Nennstroeme that has a high performance and a simple structure and a small size. According to the invention, the structural unit is a fixed switching element / connection designed as an end-side connection plate of the vacuum interrupter chamber and connected in a known manner to the chamber housing by welding or soldering. Fig. 1

Description

For this 1 page drawings

Field of application of the invention

The invention relates to a vacuum interrupter chamber for low-voltage vacuum contactors, especially for use under severe electrical and mechanical operating conditions, but for smaller rated currents, of which jieben a long life and high reliability and the lower nominal current ranges adapted and lower production costs, especially for mass production is required.

The vacuum interrupter chamber consists of the well-known basic structure of fixed and movable electrode or feed and associated with these or one-piece contact pieces, an insulating section, a housing made of stainless steel, a possibility for pumping or forming and vacuum-tight closing.

Characteristic of the known technical solutions

Various vacuum interrupters have already become known which, in addition to the normally usual basic structure or the basic components, basically have a design with separate supply electrodes and contact pieces attached thereto on the front side. In this case, the feed electrodes consist of the necessary for the power supply and heat dissipation both technically and economically most suitable Cu, the actual switching pieces depending on the intended use for circuit breakers, circuit breakers or contactors from a, adapted to the respective tasks contact material and an adapted form. Next, these contacts are by a complex process, eg. As soldering under vacuum, attached.

There are further known arrangements, for. For example, US-PS 3082307, WP 116987, in which one or two disc-shaped Isolierstrecken be used. These disk-shaped insulating sections are provided with a metal ring to compensate for the different coefficients of thermal expansion at the inner and outer diameter. For vacuum-tight connection, the inner ring is then soldered to the feed and the outer ring, z. B. by welding or soldering with the Kämmergehäuse connected.

Disadvantage of these known arrangements is the great effort required to connect the switching pieces with the feeders, z. As soldering under vacuum, the production of the switching pieces itself must be applied. This also applies to the connection of the disc-shaped insulating section with inner ring with the associated feed. This complicates the fact that the bond between the insulator and the shrunk-on inner ring, the thermal stress during the soldering process can be disturbed or damaged by soldering.

Object of the invention.

The aim of the invention is a vacuum switching chamber with a high performance at low production costs through rational production.

Explanation of the essence of the invention

The invention has for its object to provide a vacuum interrupter for small rated currents, which has a high performance and a simple structure and small size.

According to the invention, this object is achieved in that the component fixed contact piece / connection is formed as an end-side end plate of the vacuum interrupter chamber.

The component movable feed / switching piece is provided in a known manner with a cup-shaped screen. In the component fixed Schaitstück / connection the actual contact piece surface is raised. The component fixed contact / terminal is extended over the area of the chamber housing and also serves as a connector, connecting rail and as

Mounting surface. In the component fixed contact / connection a pumping neck is used and led out to the side of a j connecting rail. This terminal rail is fixed to the component switching piece / connection by known means

connected and serves as a mechanical protection for the pumping nozzle. i

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embodiment

The invention will be explained below using an exemplary embodiment. In the drawing show: j

Fig. 1: Vacuum switching chamber j

Fig.2: I

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The vacuum switching chamber shown in Fig. 1 consists of a tubular chamber housing 3, so that with the |

Conventional procedures connected Isolierstrecke4, z. B. ceramic or glass, which is a cap 11 with the metal bellows 8 j

and this bellows is connected to the component movable feed / switching piece 1. The fixed contact 2 is analogous to j

Component 1 of a suitable contact material, for. B. FeCu, CuCo, CuFeCo to WP 208701 made in one piece and with

the chamber housing 3 by welding or soldering vacuum-tight. This fixed contact 2 serves as i

Switching piece or contact surface and at the same time with a protruding from the region of the chamber housing 3 section j

as a connecting rail with the terminal screw 5. With a suitable design of the switching piece area, z. B. by a j

cup-shaped screen 6 and the recess 7, a leakage of metal vapor and thus an occupancy of |

Insulating 4 avoided as an essential requirement for a long life. ί

The connection of the items can be done in a known manner by welding or soldering. Advantageously, j could also be the junction between the housing 3 and the fixed contact piece 2 after the formation-annealing process in a -

Vacuum oven by means of soldering done. , _;

A further variant of the embodiment of the fixed contact piece 2 is shown in FIG. 2. Here, the fixed contact piece 2 is circular |

formed, connected to the chamber housing 3 by welding or soldering and has in its center or on a j

another point the pumping neck 10 for the necessary forming process by an externally arranged pumping station. j

For further material savings, a connecting rail 9 can be provided on the fixed contact piece 2 by conventional methods: or be attached.

In addition to the Ausführungs'en shown in Figures 1 and 2 are other variants in the design of Abächlußplatte-;

Contact piece 2 possible. Essential is the unit of contact piece, end plate and connection. i

Claims (4)

  / " Invention claim: 1. Vacuum switching chamber for low-voltage vacuum contactors of low rated current with a fixed and movable via a bellows switching piece, a tubular housing made of thermally matched to the insulating steel, a subsequent to this housing cylindrical insulator and a one-piece movable cylindrical feed / switching piece characterized in that the component fixed contact piece / connection (2) is designed as an end-side end plate of the vacuum interrupter chamber and is connected in a known manner with the chamber housing (3) by welding or soldering vacuum-tight. 2. Vacuum switching chamber according to item 1, characterized in that the component movable feed / switching piece (1) is provided in a known manner with a cup-shaped screen (6) and that in the component fixed contact piece / connection (2), the actual contact piece surface is raised. 3. Vacuum switching chamber according to item 1 and 2, characterized in that the component fixed contact piece / terminal (2) over the region of the chamber housing (3) is extended and at the same time as a connecting piece, connecting rail (9) and is designed as a mounting surface. 4. Vacuum switching chamber according to item 1 and 2, characterized in that in the component fixed contact piece / connection (2) a pumping neck (10) is inserted and a connecting rail (9) is arranged leading out to the side and this connecting rail (9) with the component fixed contact piece / connection (2) is connected by known means and at the same time as a mechanical protection for the pumping neck (10) is provided.