CN111354578A

CN111354578A - Electrical contact assembly with groove

Info

Publication number: CN111354578A
Application number: CN202010174586.9A
Authority: CN
Inventors: 何斌; 沈冬月; 龚志杰; 余小年; 申志刚; 叶志锋; 黄庆忠; 张明江; 陈松杨
Original assignee: Fuda Alloy Materials Co Ltd
Current assignee: Zhejiang Fuda Alloy Materials Technology Co Ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-06-30

Abstract

The invention discloses an electrical contact assembly with a groove, which comprises a contact bridge and an electrical contact arranged on the contact bridge, wherein the surface of the contact bridge facing the electrical contact is provided with the groove, the groove is arranged at a position close to the intersection between the contact bridge and the electrical contact, and the welding flux formed after welding is filled between the groove and the edge of the electrical contact. The invention has the following advantages and effects: the design mode breaks through the conventional design thought of the existing electrical contact element, and the change of the structure of the contact bridge product is adopted to limit the solder to climb to the working surface of the electrical contact without additionally increasing the cost. The whole structure is easy to process, accurate and effective, high in efficiency and capable of improving the yield of products.

Description

Electrical contact assembly with groove

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to an electrical contact assembly with a groove.

Background

At present, the manufacture of parts of low-voltage electrical appliances is continuously developing towards modularization and integration, wherein the most critical 'heart' part of the low-voltage electrical appliances is an electrical contact assembly, so how to ensure the welding quality and stability between the parts of the electrical contact assembly becomes the key for determining the quality of the low-voltage electrical appliance product.

The conventional electrical contact assembly comprises an electrical contact 2 and a contact bridge 1 (refer to fig. 5), when welding processes between the electrical contact and the contact bridge are performed by each electrical contact supplier at present, solder and the electrical contact are sequentially placed on the contact bridge to enable the three to be in butt joint, then welding is performed, and the solder overflows along with melting of the internal solder in the welding process, so that the phenomenon that the solder climbs to a working surface of the electrical contact is caused, the electrical contact contacts the solder in contact, the moving contact and the static contact cannot be separated from an electrical appliance, certain risk is brought to the incapability of breaking when the electrical contact is used, and meanwhile, the yield of the electrical contact welding assembly is reduced.

Disclosure of Invention

The invention aims to provide an electrical contact assembly for preventing solder from climbing points during welding of an electrical contact, and solves the problems that the solder of the electrical contact is easy to climb points and the yield is low in the prior art.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a take electric contact subassembly of recess, is including touching the bridge and setting up in the electric contact who touches the bridge, the one side of touching the bridge and towards electric contact is equipped with the recess, the recess sets up in being close to and touches the crossing department between bridge and the electric contact between the two, it has the solder that the welding back formed to fill between recess and the electric contact edge.

Further setting the following steps: the groove is disposed circumferentially around the periphery of the electrical contact to form an annular shape.

Further setting the following steps: the shape of the groove is matched with the shape of the peripheral outline of the electric contact.

Further setting the following steps: the distance between the groove and the electrical contact is 0-0.5 mm.

Further setting the following steps: the cross-sectional shape of the groove comprises a trapezoid.

Further setting the following steps: the cross section of the groove is in an isosceles trapezoid shape.

Further setting the following steps: the apex angle of isosceles trapezoid all is equipped with the excessive arcwall face of arc.

Further setting the following steps: the depth of the groove is 0.1-1.5mm, and the width of the cross section of the groove is 0.5-2.5 mm.

Further setting the following steps: the material of the welding flux comprises AgCuZn, AgCuP, AgCuZnSn and CuP, the thickness of the welding flux before welding is 0.02-0.15mm, and the size of the welding flux before welding is 50-90% of the welding surface area of the electrical contact.

Further setting the following steps: the welding mode of the solder comprises resistance brazing, induction brazing and flame brazing.

In conclusion, the invention has the following beneficial effects: when in welding, the soldering welding is adopted and the heating direction is adjusted to ensure that the heat receiving capacity of the contact bridge is larger than that of the contact, and because the solder always flows towards the side with high temperature, the solder melted on the edge of the electric contact almost flows into and fills the groove after being welded, and is not excessively accumulated or climbs to the working surface of the contact. Compared with the conventional non-grooved electrical contact assembly, the root of the electrical contact after the non-grooved electrical contact assembly is welded forms a circle of round root with accumulated solder, as shown in fig. five, when the local welding temperature is too high or the pressure is too high, the solder on the side with the too high temperature or the side with the larger pressure is easy to be excessively accumulated, so that the solder climbs to the surface of the contact, the electrical contact is contacted with the solder in the contact process, the moving contact and the static contact cannot be separated, the failure of an electrical appliance is caused, and the danger is brought to users.

The groove is designed into a trapezoidal shape, so that the width of the upper end of the groove is larger than that of the lower end of the groove, the maximum charging volume is realized, the mechanical defects of bending, cracking and the like of a base contact bridge in the electrical contact process caused by overlarge local depth of the shapes of the grooves such as a funnel shape and the like are avoided, and the temperature rise or the increase of the resistance of an electrical contact assembly body cannot be caused due to the fact that solder is filled in the groove to the maximum extent in the design.

The design mode breaks through the conventional design thought of the existing electrical contact element, and the change of the structure of the contact bridge product is adopted to limit the solder to climb to the working surface of the electrical contact without additionally increasing the cost. The whole structure is easy to process, accurate and effective, high in efficiency and capable of improving the yield of products.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment;

FIG. 2 is an enlarged view of portion D of FIG. 1;

FIG. 3 is a schematic view of a welded structure according to an embodiment;

FIG. 4 is a schematic structural diagram of the second embodiment;

figure 5 is a schematic view of a prior art electrical contact assembly weld configuration.

In the figure: 1. contacting the bridge; 2. an electrical contact; 3. a groove; 4. welding flux; 5. an arc-shaped surface.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1 to 3, an electrical contact assembly with a groove includes a contact bridge 1 and an electrical contact 2 disposed on the contact bridge 1, wherein a groove 3 is disposed on a surface of the contact bridge 1 facing the electrical contact 2, and the groove 3 is disposed near an intersection between the contact bridge 1 and the electrical contact 2; the groove 3 is arranged around the periphery of the electric contact 2 to form a ring shape, and the shape of the groove 3 is matched with the shape of the peripheral outline of the electric contact 2. The cross section of the groove 3 comprises a trapezoid, in particular an isosceles trapezoid, the lower bottom of the isosceles trapezoid is arranged upwards, and the oblique angle is 60 degrees.

The distance between the recess 3 and the electrical contact 2 is 0-0.5mm, preferably 0.1mm (the distance between the recess 3 and the electrical contact 2 is indicated by the letter C in the figure); the depth of the grooves 3 is 0.1-1.5mm, preferably 0.4mm (the depth of the grooves 3 is indicated by the letter a in the figure), and the cross-sectional width of the grooves 3 is 0.5-2.5mm, preferably 1.7mm (the cross-sectional width of the grooves 3 is indicated by the letter B in the figure).

And a welding material 4 formed by welding is filled between the groove 3 and the edge of the electric contact 2, the material of the welding material 4 comprises AgCuZn, AgCuP, AgCuZnSn and CuP, specifically a B56AgCuZnSn brazing filler metal, and the specification is 6 x6x0.08mm. The thickness of the solder 4 before welding is 0.02-0.15mm, and the size of the solder 4 before welding is 50-90% of the welding surface area of the electrical contact 2. The welding method of the welding material 4 includes resistance brazing, induction brazing, flame brazing, preferably high-frequency induction welding, the welding coil is circular, and the coil is heated at the lower end of the contact bridge 1 during welding.

Example two:

referring to fig. 4, the difference between the present embodiment and the first embodiment is that the top corners of the isosceles trapezoid are provided with arc-shaped surfaces 5 with arc transition, the a dimension is 0.6mm, the B dimension is 1.5mm, the C dimension is 0.05mm, and the fillet radius of the arc-shaped surfaces 5 is 0.75 mm. In the embodiment, the solder is B25AgCuZn solder, and the specification before welding is 4 x6x0.08mm; the welding mode of the welding flux is high-frequency induction welding, the welding coil is square, and the coil is heated in the middle of the contact bridge 1 during welding.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a take electrical contact subassembly of recess, is including touching bridge (1) and setting up in electrical contact (2) of touching bridge (1), its characterized in that: one surface of the contact bridge (1) facing the electric contact (2) is provided with a groove (3), the groove (3) is arranged at the position close to the intersection between the contact bridge (1) and the electric contact (2), and a welding flux (4) formed after welding is filled between the groove (3) and the edge of the electric contact (2).

2. The recessed electrical contact assembly of claim 1, wherein: the groove (3) is arranged around the periphery of the electric contact (2) to form a ring shape.

3. The recessed electrical contact assembly of claim 2, wherein: the shape of the groove (3) is matched with the shape of the peripheral outline of the electric contact (2).

4. The recessed electrical contact assembly of claim 1, wherein: the distance between the groove (3) and the electrical contact (2) is 0-0.5 mm.

5. The recessed electrical contact assembly of claim 1, wherein: the cross-sectional shape of the groove (3) comprises a trapezoid.

6. The recessed electrical contact assembly of claim 5, wherein: the cross section of the groove (3) is in an isosceles trapezoid shape.

7. The recessed electrical contact assembly of claim 6, wherein: the apex angle of the isosceles trapezoid is provided with an arc-shaped surface (5) with excessive arc-shaped.

8. The recessed electrical contact assembly of claim 1, wherein: the depth of the groove (3) is 0.1-1.5mm, and the width of the cross section of the groove (3) is 0.5-2.5 mm.

9. The recessed electrical contact assembly of claim 1, wherein: the material of the welding flux (4) comprises AgCuZn, AgCuP, AgCuZnSn and CuP, the thickness of the welding flux (4) before welding is 0.02-0.15mm, and the size of the welding flux (4) before welding is 50-90% of the welding surface area of the electrical contact (2).

10. The recessed electrical contact assembly of claim 1, wherein: the welding modes of the welding materials (4) comprise resistance brazing, induction brazing and flame brazing.