CZ300252B6 - Electric apparatus moving contact, particularly circuit breaker moving contact - Google Patents

Abstract

The present invention relates to a an electric apparatus moving contact (1), particularly circuit breaker moving contact consists of a mutually joined supporting part (2) and an arm contact (3), whereby the electrically conducting arm contact (3) consists of at least one cross U-section being longitudinally and symmetrically arranged at the end of the moving contact (1) supporting part (2). In a portion of its insertion on the end of the moving contact (1) supporting part (2), said arm contact (3) is coupled therewith by cross point weld (8) along with the end of an electrically conducting cable (9) of any trigger (4, 5) of the electric apparatus or it may be optionally coupled therewith by riveting, adhesive bonding, or pressing in accordance with a selection whether the arm contact (3) is formed by an electrically conducting sheet bent to the shape of U-section, or by stamping of electrically conduction sheet or 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 ART

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, and is no longer shaped or cut out from the waist, and possibly modified by compaction Another method is that the entire contact is cut out of a steel strip and the point of transfer of electric current is equipped with a contact contact with increased electrical conductivity, usually of silver alloy. To a large extent, movable contacts, also made up of dual material, namely the carrier part of the movable contact, cut out of the steel waist and attached thereto, have a cross section of a full shoulder contact with increased electrical conductivity, usually copper and their alloys or silver plated.

However, the full cross section 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 so 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.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome the 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. characterized in that the movable contact, composed of an interconnected support part and an arm contact, is provided with an electrically conductive 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, for example, a single but sufficient transverse spot weld together with the end of the wire. . 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.

The arm contact of the movable contact is easily modified in accordance with the invention, either by forming a U-shaped bent corrugated sheet with a corrosion resistance, for example of copper, or as a molding, or as a cast from electro-conductive metal or the like.

-1 CZ 300252 B6

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and effects of the present invention are further evident from the accompanying drawings, wherein FIG. 1 is a simplified view of the movable contact in the environment of a schematically illustrated thermal and electromagnetic release of the electrical apparatus; FIG. Fig. 3 is a plan view of the movable contact with the support part and the associated arm contact and the end of the electrical cable by means of a transverse spot weld.

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DETAILED DESCRIPTION OF THE INVENTION

The movable contact 1 of the electrical apparatus, in particular a circuit breaker (not shown), is formed from a mutually connected carrier part 2 and an arm contact 3, wherein the arm contact 3, preferably as an electrical conductor, is formed by at least one U-profile and longitudinally and symmetrically arranged at the end 2 of the movable contact 11. The movable contact 1 as shown in FIG. 1 is arranged in the environment of the thermal release 4 and the electromagnetic release 5 of the electric apparatus, of which the most important for the operation of the electric apparatus is electrical power is being transferred.

According to an exemplary embodiment, the carrier part 2 of the movable contact 1 is formed, for example, of a steel sheet 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 provided, for example by rounding, compacted by crimping to the appropriate shape, or provided with an optional electrically conductive contact of silver or the like, it forms appropriate contact contact with the fixed contact 6 for the current current. contact to surface contact. The longitudinal symmetry of the system from the movable contact portion 2 of the latching arm contact 3 ensures that there is no undesirable deflection or tilting of the movable contact 1 at its pivotal position, so that the desired contact parameters can be reliably set and operated in electrical operation. keep the device 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 enlarging the overall surface of the shoulder contact 3, provide heat dissipation. so that the arm contact 3 can be subjected to a higher current load than can be achieved with the known full-section arm contacts.

The arm contact 3, at the portion of its mounting on the end of the movable contact support part 2, is connected to it, for example, by 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. The arm contact 3 can also be pressed, riveted, glued or the like at the end of the movable contact support part 2, optionally.

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.

-2GB 300252 B6

Industrial applicability

The movable contact according to the invention can be used in various modifications in electrical apparatuses for high electrical capacities, 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 15 1. A movable contact (1) of an electrical apparatus, in particular a circuit breaker, consisting of an interconnected carrier ( 2) and arm contact ( 3) characterized in that it is provided with an electrically conductive arm contact (3) having at least one transverse U-profile, longitudinally and symmetrically arranged at the end of the support part (2) of the movable contact (1). Movable contact according to claim 1, characterized in that the shoulder contact (3) is connected to it at the end of the movable contact support (2) by a transverse point weld (8) together with the end of the electric cable (9) any of the triggers (4, 5) of the electrical apparatus. The movable contact according to claim 1, characterized in that the arm contact (3). in part of its mounting on the end of the carrier part (2) of the movable contact (1) it is connected to it by riveting, gluing or pressing. Moving contact according to claim 1, characterized in that it is formed by a U-shaped bent electrical sheet. The movable contact according to claim 1, characterized in that it is formed by an electroconductive metal molding. Moving contact according to claim 1, characterized in that it is a casting.