Moving contact assembly and contactor

Abstract

The utility model belongs to the technical field of contactors, and discloses a moving contact assembly and a contactor. The moving contact assembly includes a contact bridge, a conductive sheet and an electric contact. The contact bridge includes a steel layer and a copper layer wrapped outside the steel layer, and the two ends of the contact bridge are bent in the same direction to form an arc-starting angle, and the part of the contact bridge placed between the two arc-starting angles is the contact bridge body; the conductive sheet is arranged on the contact bridge body, and along the thickness direction of the contact bridge body, the conductive sheet and the arc-starting angle are respectively arranged on both sides of the contact bridge body; on the plate surface of the conductive sheet away from the contact bridge body, electric contacts are arranged at both ends of the length direction of the conductive sheet. The contact bridge of the moving contact assembly has high strength and conductivity, which not only prolongs the service life of the moving contact assembly, but also improves the working reliability of the contactor, and the material cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to a moving contact assembly and a contactor. Background Art

[0002] When a contactor is powered on, the moving contacts at both ends of the contact bridge are most severely damaged, representing a weak link in the contactor's electrical life. To address this issue, existing contactor manufacturers often increase the arc striking angle at both ends of the contact bridge to guide the arc toward the ends of the bridge, thereby reducing the arc's burning time on the electrical contacts and extending the contactor's service life.

[0003] At present, the arc-starting angle structure of small-scale contactors is widely used. In order to make the product design more compact and easier to manufacture, the arc-starting angle is usually formed by directly bending the contact bridge. In order to ensure the high conductivity of the contact bridge, the contact bridge is generally made of copper. Copper material has low strength and is easy to deform, which causes the bending part of the arc-starting angle to burn out easily. After burning, the arc-starting angle falls off and causes contactor failure. The cost of copper material is also high. In addition, additional arc-starting parts are required to guide the direction of the arc, and the structure is relatively complex. If the contact bridge is made of steel material, although the strength of the contact bridge can be improved, the steel material is prone to rust in a humid working environment and requires additional copper or silver plating, which greatly increases the production cost. In addition, under large-scale current levels, the arc-starting angle structure is prone to deformation and wrinkling during the bending process, and is easily deformed by the arc, causing the mechanism to jam and seriously affecting the working reliability of the electrical product.

[0004] Therefore, there is an urgent need to provide a moving contact assembly and a contactor to solve the above technical problems. Utility Model Content

[0005] According to one aspect of the present invention, a moving contact assembly is provided, wherein the contact bridge has high strength and conductivity, which not only prolongs the service life of the moving contact assembly, but also improves the working reliability of the contactor, and has low material cost.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Moving contact assembly, comprising:

[0008] The contact bridge comprises a steel layer and a copper layer wrapped around the steel layer, wherein both ends of the contact bridge are bent in the same direction to form arc striking angles, and the portion of the contact bridge located between the two arc striking angles is the contact bridge body;

[0009] A conductive sheet is provided on the contact bridge body, and along the thickness direction of the contact bridge body, the conductive sheet and the arc striking angle are respectively placed on both sides of the contact bridge body;

[0010] The electrical contacts are provided on the plate surface of the conductive sheet facing away from the contact bridge body, and at both ends of the conductive sheet in the length direction.

[0011] Optionally, the copper layer is attached to both the upper and lower surfaces of the steel layer, and the edges of the two copper layers on both sides of the steel layer are connected by punching to wrap the side walls of the steel layer.

[0012] Optionally, the included angle between the arc striking angle and the contact bridge body is greater than or equal to 90°.

[0013] Optionally, a first positioning structure is provided between the contact bridge body and the conductive sheet, and the first positioning structure is used to position the conductive sheet on the contact bridge body;

[0014] On the plate surface of the conductive sheet facing away from the contact bridge body, a second positioning structure is provided at both ends of the conductive sheet in the length direction. The second positioning structure is arranged in a one-to-one correspondence with the electrical contacts, and the second positioning structure is used to position the corresponding electrical contact on the conductive sheet.

[0015] Optionally, the first positioning structure includes a positioning hole and a first positioning column. The positioning hole is provided on one of the contact bridge body and the conductive sheet, and the first positioning column is provided on the other one. The first positioning column is inserted into the positioning hole.

[0016] Optionally, the contact bridge body is provided with the positioning hole, which is a blind hole formed by stamping; and / or the first positioning column is formed by stamping.

[0017] Optionally, there are multiple groups of positioning holes, and the multiple groups of positioning holes are arranged at intervals along the length direction of the contact bridge body or the conductive sheet. Each group of positioning holes includes multiple positioning holes arranged at intervals along the width direction of the contact bridge body or the conductive sheet, and the positioning holes are arranged in a one-to-one correspondence with the first positioning columns.

[0018] Optionally, the positioning structure is a second positioning post provided on the conductive sheet, and the second positioning post abuts against a side wall of the electrical contact.

[0019] Optionally, the second positioning post is arranged on a side of the electrical contact away from the arc striking angle; and / or, a plurality of second positioning posts are provided, and the plurality of second positioning posts are arranged at intervals along the circumference of the electrical contact.

[0020] According to another aspect of the present invention, the present invention further provides a contactor, comprising a housing and a contact system disposed in the housing, wherein the contact system comprises the moving contact assembly described in any one of the above technical solutions.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a moving contact assembly, comprising a contact bridge, a conductive sheet, and an electrical contact. The contact bridge comprises a steel layer and a copper layer wrapped around the steel layer, with both ends of the contact bridge bent in the same direction to form an arc-starting angle. Compared with conventional contact bridges made of a single copper material, this contact bridge retains the high electrical conductivity of copper, reduces the amount of copper used, and lowers material costs. Furthermore, the high strength of the steel layer improves the overall strength of the contact bridge, reduces the risk of deformation, wrinkling, and jamming of the arc-starting angle, extends the service life of the moving contact assembly, and thereby improves the reliability of the contactor. Furthermore, the steel layer contains Fe, which can cooperate with the arc-starting angle to guide the direction of the arc. Furthermore, the steel layer itself has a certain degree of corrosion resistance, and the copper layer can also protect the steel layer, preventing the steel layer from rusting due to direct contact with air, thereby improving the reliability of the moving contact assembly. Furthermore, the arc-starting angle is integrally formed by bending at both ends of the contact bridge. Compared with the conventional method of welding the arc-starting angle to the contact bridge, this method reduces both processing difficulty and the use of fewer parts.

[0023] The contact bridge's steel layer is coated with copper layers on both its upper and lower surfaces. The edges of the two copper layers, placed on either side of the steel layer, are stamped together to enclose the steel's sidewalls. This arrangement ensures the copper layer encloses the steel layer while simplifying the manufacturing process, improving efficiency and reducing costs.

[0024] A first positioning structure is provided between the contact bridge body and the conductive sheet, and a second positioning structure is provided between the conductive sheet and the electrical contact. The first and second positioning structures enable the contact bridge, the conductive sheet, and the electrical contact to be positioned, enabling welding between the contact bridge body and the conductive sheet, and between the conductive sheet and the electrical contact, to be completed in a single welding process. Compared to the prior art method of first welding the conductive sheet to the electrical contact and then welding the conductive sheet to the contact bridge body, this simplifies the cumbersome positioning process, eliminates a single welding process, and significantly improves processing efficiency.

[0025] The utility model also provides a contactor, comprising a housing and a contact system, wherein the contact system comprises the above-mentioned moving contact assembly. Due to the use of the above-mentioned moving contact assembly, the contactor has a low failure rate and high working reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0027] Figure 1 This is a structural diagram of a moving contact assembly provided by an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 Enlarged view at point A;

[0029] Figure 3 This is an exploded schematic diagram of a moving contact assembly from one perspective provided by an embodiment of the present utility model;

[0030] Figure 4 It is a schematic diagram of an exploded view of the moving contact assembly from another perspective provided by an embodiment of the present utility model.

[0031] In the picture:

[0032] 100, contact bridge; 101, steel layer; 102, copper layer; 110, contact bridge body; 111, positioning hole; 120, arc striking angle;

[0033] 200, conductive sheet; 210, first positioning post; 220, second positioning post;

[0034] 300. Electrical contacts. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] This embodiment provides a moving contact assembly, the contact bridge of which has high strength and conductivity, which not only prolongs the service life of the moving contact assembly, but also improves the working reliability of the contactor, and has low material cost.

[0040] Specifically, if Figures 1-4 As shown, the movable contact assembly includes a contact bridge 100, a conductive strip 200, and an electrical contact 300. The contact bridge 100 comprises a steel layer 101 and a copper layer 102 wrapped around the steel layer 101. The two ends of the contact bridge 100 are bent in the same direction to form arcing angles 120. The portion of the contact bridge 100 between the two arcing angles 120 constitutes the contact bridge body 110. The conductive strip 200 is mounted on the contact bridge body 110. Along the thickness of the contact bridge body 110, the conductive strip 200 and the arcing angle 120 are positioned on either side of the contact bridge body 110. Electrical contacts 300 are located on the surface of the conductive strip 200 facing away from the contact bridge body 110, at both ends of the lengthwise direction of the conductive strip 200.

[0041] In this embodiment, the arc striking angle 120 is formed by bending at both ends of the contact bridge 100. Compared with the prior art in which the arc striking angle and the contact bridge are separate structures and connected by welding, the processing procedure is simplified, which is conducive to improving processing efficiency and also reduces the use of parts.

[0042] By providing the contact bridge 100 including a steel layer 101 and a copper layer 102 wrapped around the steel layer 101, compared with the traditional contact bridge 100 using a single copper material, on the one hand, the contact bridge 100 retains the high electrical conductivity of copper, reduces the amount of copper used, and reduces material costs. At the same time, the high strength of the steel layer 101 improves the overall strength of the contact bridge 100, reduces the risk of deformation, wrinkling, and jamming of the arc striking angle 120, extends the service life of the moving contact assembly, and thus improves the reliability of the contactor operation. On the other hand, the steel layer 101 contains Fe elements, which can cooperate with the arc striking angle 120 to guide the direction of the arc. On the other hand, the steel layer 101 itself has a certain anti-corrosion ability, and the copper layer 102 can also protect the steel layer 101, preventing the steel layer 101 from rusting due to direct contact with air, thereby improving the reliability of the moving contact assembly.

[0043] Experimental verification shows that, compared with the traditional moving contact assembly, the moving contact assembly provided by this embodiment has an electrical life increased by 15% and the amount of copper material used is reduced by 10%.

[0044] It is worth noting that the length direction of the conductive sheet 200 and the contact bridge body 110 is Figure 1 In the direction indicated by the X axis, the thickness direction of the contact bridge body 110 is Figure 1 In the direction indicated by the Z axis, the width direction of the conductive sheet 200 and the contact bridge body 110 is Figure 1 The direction shown by the Y axis.

[0045] Optionally, the material of the copper layer 102 may be any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material or dispersion-reinforced copper-based material.

[0046] Optionally, the material of the steel layer 101 can be any one of iron, iron alloy, copper-clad steel, stainless steel, carbon steel, silicon steel, structural steel, copper-plated iron, and silver-plated iron.

[0047] Optionally, the material of the conductive sheet 200 may be any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material or dispersion-reinforced copper-based material.

[0048] Optionally, the material of the electrical contact 300 may be any one of silver tin oxide, silver tin oxide indium oxide, silver cadmium oxide, silver zinc oxide, silver nickel, silver copper alloy, silver graphite, silver tungsten, silver tungsten carbide, silver tungsten carbide graphite, silver graphene, and copper graphene.

[0049] Optionally, continue with Figure 3In this embodiment, the included angle a between the arcing angle 120 and the contact bridge body 110 is greater than or equal to 90°. This configuration prevents significant deformation of the contact bridge 100 due to arc attraction during disconnection and connection, making it less likely to cause wrinkles, delamination, cracking, or other issues at the bends. This makes the moving contact assembly suitable for contactor products of varying current levels, offering high universality.

[0050] Of course, in other embodiments, the size of the angle a between the arc striking angle 120 and the contact bridge body 110 can also be adjusted according to the placement position of the switch housing, arc extinguishing grid, etc. of the contactor, so as to achieve the purpose of rapid arc striking, thereby extending the service life of electrical switches such as contactors.

[0051] Furthermore, in one possible embodiment, the contact bridge 100 has a specific structure as follows: copper layers 102 are attached to both the upper and lower surfaces of a steel layer 101. The edges of the two copper layers 102 on either side of the steel layer 101 are stamped together to enclose the sidewalls of the steel layer 101. This arrangement ensures that the copper layer 102 encloses the steel layer 101 while simplifying the manufacturing process, thereby improving processing efficiency and reducing processing costs.

[0052] Furthermore, a first positioning structure is provided between the contact bridge body 110 and the conductive sheet 200. The first positioning structure is used to position the conductive sheet 200 on the contact bridge body 110. Second positioning structures are also provided on the surface of the conductive sheet 200 facing away from the contact bridge body 110, at both ends of the conductive sheet 200 in the longitudinal direction. The second positioning structures are provided in a one-to-one correspondence with the electrical contacts 300 and are used to position the corresponding electrical contact 300 on the conductive sheet 200. The first and second positioning structures enable the contact bridge 100, the conductive sheet 200, and the electrical contact 300 to be positioned. This allows the welding between the contact bridge body 110 and the conductive sheet 200, and between the conductive sheet 200 and the electrical contact 300 to be completed in a single welding process. Compared to the prior art method of first welding the conductive sheet to the electrical contact and then welding the conductive sheet to the contact bridge body, this simplifies the tedious positioning process, eliminates a single welding process, and significantly improves processing efficiency.

[0053] Further, see Figure 3 and Figure 4The first positioning structure includes a positioning hole 111 and a first positioning post 210. One of the contact bridge body 110 and the conductive sheet 200 is provided with a positioning hole 111, and the other is provided with a first positioning post 210. The first positioning post 210 is inserted into the positioning hole 111. The cooperation between the positioning hole 111 and the first positioning post 210 positions the conductive sheet 200 relative to the contact bridge body 110. This simple structure facilitates positioning with high precision, reducing the risk of displacement of the conductive sheet 200 during welding.

[0054] In this embodiment, the positioning holes 111 are provided on the contact bridge body 110 , and the first positioning posts 210 are provided on the surface of the conductive sheet 200 facing the contact bridge body 110 .

[0055] Optionally, in one embodiment, the contact bridge body 110 is provided with a positioning hole 111, which is a blind hole formed by stamping. This arrangement prevents the steel layer 101 encased in the copper layer 102 from being exposed to air due to the positioning hole 111, thereby preventing the steel layer 101 from rusting due to prolonged contact with air.

[0056] Alternatively, in one embodiment, the first positioning posts 210 are formed by stamping. Stamping is a simple and convenient process, improving processing efficiency while minimizing the consumption of other materials. Furthermore, when the first positioning posts 210 are disposed on the contact bridge body 110, the stamped first positioning posts 210 do not expose the steel layer 101 to air, thus preventing corrosion of the steel layer 101 from prolonged contact with air.

[0057] Further, see Figures 1-4 Multiple groups of positioning holes 111 are provided. These groups of positioning holes 111 are spaced apart along the length direction (X-axis direction) of the contact bridge body 110 or the conductive sheet 200. Each group of positioning holes 111 includes multiple positioning holes 111 spaced apart along the width direction (Y-axis direction) of the contact bridge body 110 or the conductive sheet 200. The positioning holes 111 are arranged in a one-to-one correspondence with the first positioning posts 210. By providing multiple groups of positioning holes 111, and each group of positioning holes 111 including multiple positioning holes 111, the connection strength between the conductive sheet 200 and the contact bridge body 110 can be improved, thereby improving the positioning effect.

[0058] Optionally, in this embodiment, two groups of positioning holes 111 are provided, and each group of positioning holes 111 includes two positioning holes 111 .

[0059] Optionally, in this embodiment, the second positioning structure is a second positioning post 220 provided on the conductive sheet 200, and the second positioning post 220 abuts against the side wall of the electrical contact 300. The structure is simple and the processing is convenient, which is conducive to improving processing efficiency.

[0060] Optionally, the second positioning column 220 can be formed by stamping. The stamping process is simple and the processing is convenient, which can improve the processing efficiency without increasing the consumption of other materials.

[0061] Optionally, a plurality of second positioning posts 220 may be provided, and the plurality of second positioning posts 220 are spaced apart along the circumference of the electrical contact 300. By providing a plurality of second positioning posts 220, the positioning effect of the electrical contact 300 can be improved.

[0062] Furthermore, the second positioning column 220 is arranged on the side of the electrical contact 300 away from the arcing angle 120. Such an arrangement can improve the stability of the center distance between the two electrical contacts 300, thereby reducing the temperature rise of the movable contact assembly during disconnection and connection, and extending the electrical life of the movable contact assembly.

[0063] This embodiment further provides a contactor, including a housing and a contact system, wherein the contact system includes the above-mentioned moving contact assembly.

[0064] Since the contactor adopts the above-mentioned moving contact assembly, the failure rate is low and the working reliability is high.

[0065] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A moving contact assembly, characterized in that: include: A contact bridge (100) comprises a steel layer (101) and a copper layer (102) wrapped around the steel layer (101), two ends of the contact bridge (100) are bent in the same direction to form arc-starting angles (120), and a portion of the contact bridge (100) disposed between the two arc-starting angles (120) is a contact bridge body (110); A conductive sheet (200) is arranged on the contact bridge body (110), and along the thickness direction of the contact bridge body (110), the conductive sheet (200) and the arc starting angle (120) are respectively arranged on two sides of the contact bridge body (110); The electric contacts (300) are disposed on the plate surface of the conductive sheet (200) facing away from the contact bridge body (110), and are disposed at both ends of the conductive sheet (200) in the length direction.

2. The moving contact assembly according to claim 1, characterized in that: The copper layer (102) is attached to the upper and lower surfaces of the steel layer (101), and the edges of the two copper layers (102) on both sides of the steel layer (101) are connected by punching to wrap the side wall of the steel layer (101).

3. The moving contact assembly according to claim 1, characterized in that: The included angle between the arc striking angle (120) and the contact bridge body (110) is greater than or equal to 90°.

4. The moving contact assembly according to claim 1, characterized in that: A first positioning structure is provided between the contact bridge body (110) and the conductive sheet (200), and the first positioning structure is used to position the conductive sheet (200) on the contact bridge body (110); On the plate surface of the conductive sheet (200) facing away from the contact bridge body (110), second positioning structures are provided at both ends of the conductive sheet (200) in the length direction, and the second positioning structures are arranged in a one-to-one correspondence with the electrical contacts (300). The second positioning structures are used to position the corresponding electrical contacts (300) on the conductive sheet (200).

5. The moving contact assembly according to claim 4, characterized in that: The first positioning structure comprises a positioning hole (111) and a first positioning column (210); one of the contact bridge body (110) and the conductive sheet (200) is provided with the positioning hole (111), and the other is provided with the first positioning column (210); the first positioning column (210) is plugged into the positioning hole (111).

6. The moving contact assembly according to claim 5, characterized in that: The contact bridge body (110) is provided with the positioning hole (111), the positioning hole (111) is a blind hole, and the blind hole is formed by stamping; and / or the first positioning column (210) is formed by stamping.

7. The moving contact assembly according to claim 5, characterized in that: The positioning holes (111) are provided in a plurality of groups, and the plurality of groups of positioning holes (111) are arranged at intervals along the length direction of the contact bridge body (110) or the conductive sheet (200). Each group of positioning holes (111) includes a plurality of positioning holes (111) arranged at intervals along the width direction of the contact bridge body (110) or the conductive sheet (200). The positioning holes (111) are arranged in a one-to-one correspondence with the first positioning posts (210).

8. The moving contact assembly according to claim 4, characterized in that: The second positioning structure is a second positioning column (220) arranged on the conductive sheet (200), and the second positioning column (220) abuts against a side wall of the electrical contact (300).

9. The moving contact assembly according to claim 8, characterized in that: The second positioning column (220) is arranged on a side of the electrical contact (300) away from the arc striking angle (120); and / or, a plurality of second positioning columns (220) are provided, and the plurality of second positioning columns (220) are arranged at intervals along the circumference of the electrical contact (300).

10. A contactor, characterized in that The invention comprises a housing and a contact system arranged in the housing, wherein the contact system comprises the moving contact assembly according to any one of claims 1 to 9.

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