CZ2005515A3 - Electric apparatus moving contact, particularly circuit breaker moving contact - Google Patents

Abstract

The movable contact (1) of the electrical apparatus, in particular the circuit breaker, is composed of a mutually connected carrier part (2) and an arm contact (3), wherein the electrically conductive arm contact (3) consists of at least one transverse U-profile, longitudinally and symmetrically arranged at the end of the carrier part (2) of the movable contact (1). The arm contact (3) in part of its engagement at the end of the support part (2) of the movable contact (1) is connected thereto by a transverse point weld (8) together with the end of the electric wire (9) of any of the trigger (4,5) of the electrical apparatus, or it is optionally connected with riveting, gluing or pressing as desired, whether the arm contact (3) is formed by a U-profile bent electrode plate, an electrically conductive metal molding or a casting, and the like.

Description

Movable contact of the electrical device, especially the circuit breaker

Technical field

The invention relates to a movable contact of an electrical apparatus, in particular a circuit breaker.

BACKGROUND OF THE INVENTION

The movable contacts of electrical devices, especially for circuit breakers, are formed by several known technological processes: The entire contact is cut out from the waist, including contact contact, is no longer shaped or cut out from the waist, and is optionally compacted (upsetting) Another method is that the entire contact is cut from a steel waist and the place of transfer of electric current is equipped with a contact contact with increased conductivity, usually of silver alloy. Movable contacts, also assembled from dual material, namely the carrier part of the movable contact, cut out of a steel waist and a side-connected, cross-section of a full shoulder contact with increased electrical conductivity, usually copper and its alloys or silver plated, are introduced.

However, the full contact arm contact has a relatively high weight, which adversely affects the rate of disconnection of the movable contact from the fixed contact of the electrical apparatus. Also its unbalanced connection from the side to the end of the steel support part of the movable contact brings to the rotary system of the whole movable contact the tilting moments, which the movable contact transversely transversely transversely positions at its rotatable bearing. contacting the arm contact to sufficiently, as far as possible, engage the fixed contact of the electrical apparatus. Due to the transversal instability of the movable contact thus arranged, essentially only its one-point contact with the fixed contact of the electrical apparatus is achieved, and hence only a moderate, less practically unreasonable transmitted electrical power is achieved.

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SUMMARY OF THE INVENTION

The object of the present invention is to overcome these disadvantages of known movable contacts, to achieve their relieving and adequate strength, while at the same time reducing material costs and increasing contact contact and heat dissipation between the movable contacts and fixed contacts. The movable contact, which is comprised of an interconnected support part and an arm contact, is provided with an electro-water arm contact of at least one transverse U-profile, longitudinally and symmetrically arranged at the end of the support part of the movable contact.

The movable contact arrangement unifies manufacturing operations, in particular by engaging the shoulder contact at the end of the movable contact carrier at the end of the movable contact carrier at the same time with a single but sufficient transverse spot weld together with the end of the electric cable. electrical apparatus. The connection of the shoulder contact in the part of its mounting on the end of the carrier part of the movable contact can be realized further by soldering, riveting, pressing, gluing etc.

According to the invention, the arm contact of the movable contact is readily modifiable by manufacturing, either by forming a U-shaped bent electrical sheet with corrosion resistance, for example of copper, or as a molding, or as a casting of electro-conductive metal or the like.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and effects of the present invention are further evident from the accompanying drawings, in which Fig. 1 is a simplified view of the movable contact in the middle. schematically illustrated thermal and electromagnetic releases of the electrical apparatus, FIG. 2 a detailed view of the movable contact with the support part and the associated U-profile boom contact, FIG. 3 is a plan view of the movable contact with the support part and the connected boom contact and end of the cable using a transverse spot weld.

DETAILED DESCRIPTION OF THE INVENTION

The movable contact 1 of the electrical apparatus, in particular of the circuit breaker (not shown), is formed from the interconnected support part 2 and the arm contact 3, the arm contact 3 preferably being electrically conductive, comprising at least one U-profile. The movable contact 1, as shown in FIG. thermal releases 4 and electromagnetic releases 5 of the electrical apparatus, of which the most important for the operation of the electrical apparatus is the contact of the movable contact 1 with the fixed contact 6 of the electromagnetic release 5, where the transmission of electric power takes place.

According to an exemplary embodiment, the support part 2 of the movable contact 1 is formed, for example, by a sheet metal blank, and is therefore strong and light. Due to its shape, the leg contact 3 is also relieved accordingly in at least one U-profile.

The interconnected assembly of the carrier part 2 and the arm contact 3 is symmetrically arranged according to the main center plane of the entire movable contact 1.

The U-profile base 7 at the free end of the arm contact 3 (FIG. 2) forms the contact with the fixed contact 6 of the electrical apparatus. Depending on how the base 7 is modified, for example by rounding, compacted by swaging to the appropriate shape, or provided with an optional electrically conductive contact of silver or the like, it forms appropriate contact with the fixed contact 6, selectable from basic one-point contact through direct contact to contact area. The longitudinal symmetry of the system from the carrier 2 of the movable contact X and the associated arm contact 3 ensures that there is no undesirable deflection or tilting of the movable contact 1 at its rotatably supported positions so that the desired contact contact parameters can be reliably set and operated keep it unchanged.

The side sections of the U-profile of the shoulder contact 3 produce a proper longitudinal reinforcing effect and at the same time, as ribs increasing the overall surface of the shoulder contact 3, provide radiation heat dissipation so that the shoulder contact 3 can be subjected to higher current loads than can be achieved .

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The arm contact 3, at the portion of its mounting on the end of the carrier part 2 of the movable contact 1, is connected to it by, for example, a transverse spot weld 8 together with the end of the electric cable 9, of any of the triggers 4,5 of the electrical apparatus (Fig. 3). The arm contact 3 can optionally be pressed, riveted, glued or the like at the end of the carrier part 2 of the movable contact 1.

The arm contact 3 is formed into at least one U-profile by a bent, corrosion-resistant, generally copper-coated sheet. In modified embodiments, the U-profile arm contact 3 is formed by a molding or a casting of an electroconductive metal or the like.

Industrial applicability

The movable contact according to the invention can be used in various modifications in electric 15 devices for high electrical powers, such as industrial circuit breakers, switch-disconnectors and the like, where due to its subtle construction but with high heat dissipation efficiency from contact contacts, at least direct contact with fixed contacts of the electric device, it enables their further miniaturization even at increased transmitted electrical powers etc.

Claims (6)

PATENT CLAIMS A movable contact (1) of an electrical apparatus, in particular a circuit breaker, comprising a mutually connected support part (2) and an arm contact (3), characterized in that it is provided with an electrically conductive arm contact (3) of at least one transverse U-profile , longitudinally and symmetrically disposed at the end of the carrier portion (2) of the movable contact (1). The movable contact according to claim 1, characterized in that the shoulder contact (3) 10 is connected to the end of the movable contact carrier (2) by a transverse spot weld (8) together with the end of the cable. (9) any of the triggers (4,5) of the electrical apparatus. The movable contact according to claim 1, characterized in that the shoulder contact (3) 15 is connected to it by riveting, gluing or pressing in part on its end at the end of the support part (2) of the movable contact (1). Moving contact according to claim 1, characterized in that the arm contact (3) is formed by a U-shaped bent electrical sheet. Moving contact according to claim 1, characterized in that the arm contact (3) is formed by an electroconductive metal molding. Moving contact according to claim 1, characterized in that the arm contact (3) is a casting.