JPS59141125A - Contactor structure for vacuum switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention comprises a fixed contact and a movable contact with a vapor shield that is movably guided in a cylindrical container. It relates to a contactor structure of a vacuum switch in which the contactor is insulated from the contactor via an insulating path.

European Patent Organization Patent Publication MOO40933 of the above types
In the contact section known from No. 2, the contact point is surrounded by an oval-shaped vapor shield, which shields the contact point from the container over the entire range of movement of the movable contact. Since the metal vapor seams) v) and ' are at the potential of the movable contact, it is necessary to maintain a relatively large distance from the fixed contact with respect to the cylindrical surface of the vapor '-'. Cylindrical container for empty, as an insulator °
If not, the above requirements mean that a separate insulating path is required between the vapor shield and the vessel at fixed contact potential. Therefore, especially in the case of a metal container, the diameter of the KA empty switch becomes relatively large.

[Purpose of the invention]

The present invention provides a contact structure of the above type that does not require great expense to prevent metal vapor from depositing on the insulation path when the container is metal and the vacuum switch has a small outer diameter. The purpose is to

[Summary of the invention]

This object is based on the present invention in the above-mentioned type of contact structure, in which the vapor shield is constructed as a disc-shaped portion of the movable contact, and the diameter of the vapor shield is such that the metal vapor generated when disconnected from the cylindrical portion of the metal container is This is achieved by selecting K in such a way that no deposits are formed in the insulation path which would reduce the voltage strength. In order to avoid fixing separate parts in the vacuum switch housing, the disc-shaped part is preferably constructed as an annular additional molded part of the contact metal. By squeezing the container toward the inside pressure in the region of movement of the disc-shaped portion after the contact is separated, the mass of the movable part can be kept relatively small. The rapidly self-cooling metal vapor is substantially prevented from moving further towards the insulator by this constriction.

[Embodiments of the invention]

Next, the present invention will be explained in detail with reference to drawings showing embodiments of a contactor structure based on the present invention.

The illustrated vacuum switch consists of a fixed contact 1 and a movable contact 2, on which a disk-shaped portion 3 is additionally molded. The cylindrical container 4 is connected to the movable contact 2 via a fixed contact IK on the one hand and an insulator 5 and a metal bellows 6 on the other hand. Movement of the movable contact 2 takes place via a movable connection 7. A further bearing support 8 for the movable connection 7 serves as a load relief for the metal bellows 6. The connection for the fixed contact is indicated at 9. Since the constricted portion 1° of the container 4 faces the disc-shaped portion 3 when the contacts 1 and 2 are open, it serves as an annular gap for the metal vapor generated when the contacts are opened. A narrow Fr1ll is formed. With this configuration, when the contact starts to separate, the internal plate-shaped part is separated from the cylindrical part of the container 4 by a relatively large distance, so that a collision from the disc-shaped part to the cylindrical part of the container 4 is avoided.

However, the ratio of the diameter of the disk-shaped portion 3 to the inner wall of the container 4 is such that the generated metal vapor can be absorbed by the wall 1211 of the insulator 5? :
It has been selected to prevent sedimentation. The migration of the metal vapor in the direction of the wall 12 is further reduced by the poleg effect of the disc-shaped part 3, especially considering the constriction 10.

As described above, according to the present invention, a metal vapor blocking part with a simple structure for a vacuum switch is formed, and this blocking part is particularly significant for a low voltage vacuum switch.

〔Effect of the invention〕

According to the invention, in the contact structure of the above type, the vapor shield is configured as a disk-shaped part of the movable contact,
Its diameter is selected in such a way that the metal vapor generated during the interruption of the metal container cylinder does not form deposits in the insulation path that would reduce the withstand voltage strength.

With such a structure, if the passage to the insulation path is narrowed by the disc-shaped part, the metal vapor generated when the contacts open will flow into the insulation path due to the pumping action of the disc-shaped part when the contact is broken. Precipitation can be avoided. Since the disc-shaped part is provided on the movable contact, the structure is simple and the expense is low.
Especially suitable for low voltage vacuum switches.
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[Brief explanation of drawings]

The drawing shows a cross-sectional view of an embodiment of a vacuum switch according to the invention. In the drawings, 1 is a fixed contact, 2 is a movable contact, 3 is a disc-shaped portion, 4 is a container, 5 is an insulator, and 10 is a constricted portion.

Claims (1)

[Claims] 1) A device comprising a fixed contact and a movable contact with a vapor shield guided to a transferable FA in a cylindrical container, wherein the fixed contact and the movable contact are connected to each other through an insulating path. In the contact structure of the vacuum switch, which is insulated by the vacuum switch, the vapor shield is configured as a disc-shaped part of the movable contact, and the diameter of the disc-shaped part is larger than the diameter of the associated cylindrical part. A contact structure for a vacuum switch, which is selected so as not to cause deposits that reduce the withstand voltage strength in an insulation path. 2. A contact structure according to claim 1. A contact structure for a vacuum switch characterized in that the disk-shaped portion is constituted as an annular contact molded portion of contact metal. 3) Claims 1 or 2 include A brush contact structure of a true switch, characterized in that, in the contact structure, the container is squeezed inward in a moving region of a disk-shaped portion of the contact.