DE407681C - Feedthrough oil switch - Google Patents

Description

GERMAN EMPIRE

ISSUED JANUARY 2, 1925

REICH PATENT OFFICE

PATENT LETTERING

- M 407681 CLASS 21c GROUP

(B 110238 Vllllsic *)

Emag Elektricitäts-A.-G. and Peter Bendmann in Frankfurt a.ffl.

Bushing oil switch. Patented in the German Empire on July 3, 1923.

Bushing oil switches are known in which, within one, precipitated with oil Implementation made of porcelain or earthenware the switching contacts are arranged. These however, have the disadvantage that they are difficult to use for higher switching capacities, 'because the ceramic material does not cope with the internal pressure that occurs when switching withstands. To remedy this disadvantage is the purpose of the invention described below.

In the drawing means:

a the bushing designed as a bushing oil switch,

b a contact rod,

c a pressure chamber made of insulating material,
d the mating contacts and

e a piston with a shoulder pin and a compression spring resting underneath /.

In the drawing, the bushing oil switch is shown in the on position. The ίο piston is pressed down by the contact rod resting on the shoulder pin, whereby the spring f is tensioned. When switching off, the contact rod b snaps upwards, whereby the piston e , which is under the pressure of the spring f , is released and thus compresses the oil in the pressure chamber c according to the spring force. The switch-off spark that forms between contact rod b and mating contact d is therefore exposed to increased pressure and is extinguished as quickly as possible.

The fact that the spark formation when switching off is reduced by means of precompression shutdown gases can only arise in small quantities, which would otherwise affect the as The cause of the extraordinary increase in the internal oil pressure are.

In such a bushing oil switch with pre-compression, only the oil in the experiences Pressure chamber an artificial increase, while the oil pressure in the bushing itself does not increase significantly. Also the Pressure equalization after switching off no longer requires a significant increase.

Such a bushing oil switch can be used for considerably higher outputs.

Claims (1)

Patent claim: Bushing oil switch, characterized in that "in which the switching contacts surrounding pressure-tight switching chamber located inside the implementation through the movable one Contact maker, piston set under spring pressure during the switch-off movement, an increase in oil pressure within the switching chamber brings forth.