CN210575798U - Contact for built-in current protector - Google Patents

Abstract

The utility model discloses a built-in current protector uses contact, built-in current protector includes bottom open-ended metal casing (3), seals metal soleplate (4) and two or three terminal (5) of metal casing (3) bottom install connection piece (6) in one of them terminal (5) upper end, the contact comprises silver layer (1) and copper layer (2), silver layer (1) through the crimping with copper layer (2) fixed connection is in the same place, copper layer (2) through the welding with connection piece (6) fixed connection is in the same place. The utility model discloses a bilayer structure contact has not only improved the reliability and the life of protector by a wide margin, has reduced manufacturing cost moreover.

Description

Contact for built-in current protector

Technical Field

The utility model relates to a built-in current protector that can automatic cutout circuit when consumer such as motor, compressor overflows when overheated, prevent it and burn out, especially relate to built-in current protector's contact.

Background

The existing built-in current protector comprises a metal shell with an opening at the bottom, a metal bottom plate for closing the bottom of the metal shell, a bimetallic strip and two or three binding posts, wherein the upper ends of the binding posts respectively penetrate through the bottom plate and extend into a closed space formed by the shell and the bottom plate, a connecting sheet is fixedly arranged at the upper end of one binding post, and a contact is fixedly arranged on the connecting sheet. When the electric equipment such as the motor, the compressor and the like is overheated overflowing, the bimetallic strip can turn over and cut off the circuit instantly, and overcurrent protection is realized.

The contact of the existing built-in current protector usually adopts a three-layer structure, namely a silver layer, a copper layer and an iron layer, wherein the copper layer is mainly used as an adhesive to adhere the iron layer and the silver layer, and because the resistivity of the copper layer is extremely low, resistance welding cannot be carried out, and the iron layer is opposite and easy to weld, the iron layer is used for fixing the contact on a welding workpiece, namely a connecting piece, by resistance welding. The iron layer is easy to be subjected to resistance welding because the resistivity is high, the high resistivity can cause the iron layer to generate a large amount of heat in the electrifying working process, the heat directly influences the contact to enable the temperature rise of the contact to be higher, so that the service life of the protector is seriously influenced, and the reliability of the protector is reduced.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a built-in current protector for contact that can not only improve the reliability and the life of protector by a wide margin, can reduction in production cost moreover.

In order to solve the technical problem, the utility model discloses a such contact for built-in current protector, built-in current protector includes bottom open-ended metal casing, seals the metal soleplate and two or three terminals of metal casing bottom install the connection piece in one of them terminal upper end, the contact comprises silver layer and copper layer, the silver layer pass through the crimping with copper layer fixed connection is in the same place, the copper layer pass through the welding with connection piece fixed connection is in the same place.

As a preferred embodiment of the utility model, the transversal of silver layer is personally submitted circularly, and the top surface of silver layer is evagination sphere, bottom surface for the indent sphere, the copper layer is cylindrically, and the top surface of copper layer is evagination sphere, bottom surface for the plane, the bottom surface of silver layer with the top surface laminating on copper layer is fixed together, the underrun laser welding on copper layer with connection piece fixed connection is in the same place.

After adopting such structure, the utility model discloses following beneficial effect has:

the utility model discloses a contact only comprises silver layer and copper layer, does not need the iron sheet, and the copper layer is preferred to be in the same place through laser welding directness and connection piece fixed connection. Because the copper layer resistivity is extremely low, the copper layer generates very little heat in the electrifying working process, and the temperature of the contact cannot rise, so that the reliability and the service life of the protector are greatly improved on the one hand, and on the other hand, the contact is reduced to a two-layer structure from a three-layer structure, so the production cost is greatly reduced.

The utility model discloses simplify the manufacturing process of contact, improved the competitiveness of product.

Drawings

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a contact for a built-in current protector according to the present invention.

Fig. 2 is a schematic top view of the contact for the built-in current protector of the present invention.

Fig. 3 is a schematic structural diagram of the built-in current protector of the present invention, the bimetallic strip is not shown.

Detailed Description

Referring to fig. 1 to 3, the built-in current protector is used for cutting off current of electric equipment such as a motor and a compressor under an overcurrent and overheat condition, and includes a metal shell 3 with an open bottom, a metal base plate 4 for sealing the bottom of the metal shell 3 by welding, and two or three terminals 5, two terminals 5 are shown in the figure, a bimetallic strip is not shown in the figure, the upper ends of the terminals 5 respectively penetrate through the metal base plate 4 and extend into a closed space formed by the metal shell 3 and the metal base plate 4, a connecting sheet 6 is fixedly installed at the upper end of one terminal 5, the contact is composed of a silver layer 1 and a copper layer 2, the silver layer 1 is fixedly connected with the copper layer 2 by crimping, and the copper layer 2 is fixedly connected with the connecting sheet 6 by welding.

As a preferred embodiment of the present invention, as shown in fig. 1, 2 and 3, the cross section of silver layer 1 is circular, the top surface of silver layer 1 is convex spherical surface 1a, the bottom surface is concave spherical surface 1b, copper layer 2 is cylindrical, the top surface of copper layer 2 is convex spherical surface 2a, the bottom surface is plane 2b, the bottom surface of silver layer 1 with the top surface of copper layer 2 is fixed together through the crimping laminating, the bottom surface of copper layer 2 pass through the laser welding with connection piece 6 fixed connection is in the same place.

Through probation, the utility model discloses a two-layer structure contact makes built-in current protector's reliability and long service life obtain promoting by a wide margin to low in production cost has gained good practical function.

Claims (2)

1. The utility model provides a built-in current protector uses contact, built-in current protector includes bottom open-ended metal casing (3), seals metal bottom plate (4) and two or three terminal (5) of metal casing (3) bottom, installs connection piece (6) in one of them terminal (5) upper end, its characterized in that: the contact is composed of a silver layer (1) and a copper layer (2), the silver layer (1) is fixedly connected with the copper layer (2) through compression joint, and the copper layer (2) is fixedly connected with the connecting sheet (6) through welding.

2. The contact for an internal current protector according to claim 1, wherein: the transversal of silver layer (1) is personally submitted circularly, and the top surface of silver layer (1) is evagination sphere (1 a), the bottom surface is indent sphere (1 b), copper layer (2) are cylindrically, and the top surface of copper layer (2) is evagination sphere (2 a), the bottom surface is plane (2 b), the bottom surface of silver layer (1) with the top surface laminating of copper layer (2) is fixed together, the bottom surface of copper layer (2) pass through laser welding with connection piece (6) fixed connection is in the same place.

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