Connecting structure of moving contact and contact support

Abstract

The utility model discloses a connecting structure of a moving contact and a contact support, which comprises the contact support, a spring and the moving contact, a contact bridge main body arranged in a mounting cavity of the contact support is arranged in the middle of a contact bridge of the moving contact, and arc-shaped convex surfaces are arranged on two sides of the contact bridge main body along the width direction of the contact bridge. And the inner side wall of the mounting cavity is provided with two arc-shaped concave surfaces which are respectively matched with the two arc-shaped convex surfaces of the contact bridge main body. The contact bridge main body is in motion friction with the contact support through the arc-shaped outer convex surfaces on the two sides, and the friction surface is large, so that the contact bridge is not easy to wear, and the working position of the bridge type contact is still ensured not to be obviously changed after multiple operations.

Description

Technical Field

[0001] The utility model relates to the field of contactors, in particular to a connecting structure of a moving contact and a contact support. Background Art

[0002] When the contactor is working, the electromagnetic system moves the contact bracket back and forth, and the moving contact is fixed on the contact bracket through a certain assembly relationship, so as to realize the opening and closing linkage of the moving contact and the static contact, and achieve the switching function of the contactor. Figure 1 As shown, two protrusions 200 are provided on each side in the width direction, and a vertical guide rail is provided on the inner wall of the mounting cavity of the contact bracket for mounting the moving contact. The contact bridge is directly clamped on the guide rail through the protrusion to achieve positioning. Since the protrusion feature is small, the protrusion of the contact bridge is easily worn, which causes the working position of the moving contact to be significantly offset and fail, and the mechanical life is short. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a connecting structure of a moving contact and a contact bracket, which mainly solves the problem that the moving friction between the contact bridge and the contact bracket causes excessive wear of the moving contact and causes the working position to shift.

[0004] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0005] A moving contact and contact support connection structure, comprising:

[0006] A contact support having a mounting cavity suitable for mounting a contact bridge, with openings being provided on both sides of the mounting cavity;

[0007] The movable contact comprises the contact bridge and two contacts respectively connected to the same side of the two ends of the contact bridge in the length direction, the two ends of the contact bridge in the length direction respectively extend out of the contact bracket from the openings on both sides of the mounting cavity, the middle part of the contact bridge comprises a contact bridge body arranged in the mounting cavity, the contact bridge body comprises arc-shaped outer convex surfaces on both sides along the width direction of the contact bridge, and the inner side wall of the mounting cavity comprises two arc-shaped concave surfaces to respectively match the two arc-shaped outer convex surfaces of the contact bridge body;

[0008] An elastic member is arranged in the installation cavity, one end of which abuts against a side of the contact bridge body facing away from the contact point, and the other end of which abuts against the contact support.

[0009] Furthermore, the bottom surface of the installation cavity is concave to form a clearance groove, and the clearance groove extends along the length direction of the contact bridge and has two ends passing through the contact bracket.

[0010] Furthermore, a convex burl is provided in the middle of the contact bridge body.

[0011] Furthermore, the contact bracket includes a main bracket and an auxiliary bracket connected to each other, the installation cavity is provided on the main bracket and passes through the top surface of the main bracket, the auxiliary bracket is located above the installation cavity, and one end of the elastic member away from the contact bridge abuts against the auxiliary bracket.

[0012] Furthermore, the two arcuate concave surfaces are symmetrically arranged, and the two arcuate concave surfaces extend from bottom to top at the same interval, and then gradually increase the interval to extend to the top surface of the main bracket.

[0013] Furthermore, two opposite limiting protrusions are provided at each opening of the installation cavity, and a space for the moving contact to move up and down is formed between the two limiting protrusions and the bottom surface of the installation cavity.

[0014] Furthermore, a surface of the limiting protrusion opposite to the moving contact is an inclined surface.

[0015] Furthermore, the elastic member is a spring.

[0016] The utility model has the following beneficial effects:

[0017] The two sides of the traditional contact bridge are straight outer side surfaces, while the two sides of the middle part of the contact bridge of the movable contact of the utility model are provided with arc-shaped outer convex surfaces, and the area of ​​the friction part with the contact support is increased, so that the contact bridge is not easy to be worn, thereby increasing the service life of the contact bridge. The contact bridge body moves and rubs with the arc-shaped concave surface of the contact support through the arc-shaped outer convex surface, and the friction surface is large and not easy to wear. After multiple operations, it is still ensured that the working position of the movable contact will not change significantly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic plan view of the contact bridge described in the background technology;

[0019] Figure 2 This is a structural diagram of a contact bridge according to an embodiment of the utility model;

[0020] Figure 3 It is a three-dimensional diagram of the connection structure between the moving contact and the contact support of the embodiment of the utility model;

[0021] Figure 4 yes Figure 3 A front view of a connection structure between a moving contact and a contact support;

[0022] Figure 5 yes Figure 3 Schematic diagram after removing the auxiliary support;

[0023] Figure 6 It is a three-dimensional schematic diagram of the main bracket of the embodiment of the utility model;

[0024] Figure 7 yes Figure 6A front view of the main bracket;

[0025] Figure 8 yes Figure 6 A cross-sectional view of the main bracket.

[0026] Explanation of reference numerals: 1. Installation cavity; 2. Arc-shaped concave surface; 3. Contact point; 4. Contact bridge; 5. Contact bridge body; 6. Arc-shaped outer convex surface; 7. Elastic member; 8. Limiting protrusion; 9. Inclined surface; 10. Bump; 11. Giving way groove; 12. Main bracket; 13. Auxiliary bracket; 14. Moving contact DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] like Figures 2 to 8 As shown, a structure for connecting a moving contact and a contact support includes a contact support, a moving contact 14, and an elastic member 7. The contact support has a mounting cavity 1 suitable for mounting a contact bridge 4, and openings are provided on both sides of the mounting cavity 1. The moving contact 14 includes the contact bridge 4 and two contacts 3 respectively connected to the two ends of the contact bridge 4 in the length direction. The two ends of the contact bridge 4 in the length direction extend out of the contact support from the openings on both sides of the mounting cavity 1, that is, the two contacts 3 extend out of the contact support. The middle part of the contact bridge 4 has a contact bridge body 5 arranged in the mounting cavity 1. The contact bridge body 5 is provided with arc-shaped outer convex surfaces 6 on both sides along the width direction of the contact bridge 4. The inner side wall of the mounting cavity 1 is provided with two arc-shaped concave surfaces 2 to match the two arc-shaped outer convex surfaces 6 of the contact bridge body 5. The elastic member 7 is arranged in the mounting cavity 1, one end of which is against the side of the contact bridge body 5 facing away from the contact 3, and the other end is against the contact support. The arc described in this article should be understood in a broad sense, including but not limited to a circular arc, an elliptical arc, a section of a spiral line, and other similar curves. The contact bridge body 5 is provided with an arc-shaped outer convex surface 6. Compared with the traditional straight outer side surface, the friction area between the contact bridge 4 and the contact bracket is increased. The contact bridge body 5 moves and rubs with the contact bracket through the arc-shaped outer convex surface 6. The friction surface is large and not easy to wear. After multiple operations, it is still ensured that the working position of the moving contact 14 will not change significantly.

[0030] As an optimized design, the bottom surface of the installation cavity 1 is concave to form a clearance groove 11, and the clearance groove 11 extends along the length direction of the contact bridge and passes through the contact bracket at both ends, that is, the clearance groove 11 extends from one opening of the installation cavity 1 to another opening. The clearance groove 11 increases the space for the moving contact to pass through the contact bracket, and the moving contact can be more conveniently rotated when inserted in the contact bracket, thereby simplifying the automated assembly of the moving contact. In addition, when the contact bracket is injection molded by a mold, the core pulling direction of the clearance groove 11 and the opening of the installation cavity is the same, and the insert used to form the clearance groove 11 and the insert used to form the opening of the installation cavity can be set as one piece, simplifying the mold structure.

[0031] As an optimized design, a convex bulge 10 is provided in the middle of the contact bridge body 5. The convex bulge 10 increases the current-carrying area of ​​the contact bridge, making the contact bridge more resistant to overload.

[0032] The contact support includes a main support 12 and an auxiliary support 13 connected to each other. The installation cavity 1 is provided on the main support 12 and passes through the top surface of the main support 12. The auxiliary support 13 is located above the installation cavity 1, and one end of the elastic member 7 away from the contact bridge 4 abuts against the auxiliary support 13. The contact support is divided into two parts, the main support 12 and the auxiliary support 13. As needed, a plurality of installation cavities 1 can be provided on the main support 12. Each installation cavity 1 is equipped with an elastic member 7 and a moving contact 14. The plurality of installation cavities 1 are all opposite to the auxiliary support 13, and one end of each elastic member 7 abuts against the same auxiliary support 13. First, the elastic member 7 is installed into the installation cavity 1 from above the main support 12, and then the main support 12 and the auxiliary support 13 are fixed to facilitate automated assembly. In other embodiments, the contact support can also be a single part formed in one piece.

[0033] In this embodiment, preferably, the two arcuate concave surfaces are symmetrically arranged, and the two arcuate concave surfaces extend from bottom to top at the same spacing b for a section, and then gradually increase the spacing (by setting the draft angle, etc.) to extend to the top surface of the main bracket, and the spacing between the two arcuate concave surfaces on the top surface of the main bracket is a, a>b. The distance between the upper parts of the two arcuate concave surfaces is greater than the distance between the lower parts, which is conducive to the processing of the contact bracket, the mold demolding of the contact bracket is easier, and the movement of the contact bridge is smoother, and it is not easy to cause jamming.

[0034] The arcuate concave surface 2 extends from the bottom surface of the mounting cavity 1 to the top surface of the main bracket 12. The insert used to form the arcuate concave surface 2 is difficult to be cored in the horizontal direction. If the arcuate concave surface 2 is extended to the top surface of the main bracket, the insert can be cored in the vertical direction, simplifying the mold structure.

[0035] As an optimized design, two relative limiting protrusions 8 are provided at each opening of the installation cavity, and a space for the contact bridge 4 to move up and down is formed between the two limiting protrusions 8 and the bottom surface of the installation cavity 1. The limiting protrusions 8 on the two inner side surfaces of the opening are symmetrically arranged, and the side of the limiting protrusion 8 opposite to the moving contact 14 is set as an inclined surface 9. The opening gradually narrows from bottom to top at the inclined surface 9. After the moving contact 14 overcomes the elastic force provided by the elastic member 7 and moves to a certain height on the inclined surface 9, it is blocked by the inclined surface 9 and cannot move up any further. The two limiting protrusions 8 limit the upward movement of the moving contact 14.

[0036] The elastic member in this embodiment is preferably a spring. In other embodiments, the elastic member may also be a spring, a polymer elastic block, or an elastic block of a composite material.

[0037] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.

Claims

1. A moving contact and contact support connection structure, characterized in that: include: A contact support having a mounting cavity suitable for mounting a contact bridge, with openings being provided on both sides of the mounting cavity; The movable contact comprises the contact bridge and two contacts respectively connected to the two ends of the contact bridge in the length direction, the two ends of the contact bridge in the length direction respectively extend out of the contact bracket from the openings on both sides of the mounting cavity, the middle part of the contact bridge comprises a contact bridge body arranged in the mounting cavity, arc-shaped outer convex surfaces are arranged on both sides of the width direction of the contact bridge body, and the inner side wall of the mounting cavity is provided with two arc-shaped concave surfaces to respectively match the two arc-shaped outer convex surfaces of the contact bridge body; An elastic member is arranged in the installation cavity, one end of which abuts against a side of the contact bridge body facing away from the contact point, and the other end of which abuts against the contact support.

2. The movable contact and contact support connection structure according to claim 1, characterized in that: The bottom surface of the installation cavity is concave to form a clearance groove, and the clearance groove extends along the length direction of the contact bridge and has two ends passing through the contact bracket.

3. The movable contact and contact support connection structure according to claim 2, characterized in that: A convex burl is arranged in the middle of the contact bridge body.

4. The movable contact and contact support connection structure according to claim 1, characterized in that: The contact support includes a main support and an auxiliary support connected to each other. The installation cavity is provided on the main support and passes through the top surface of the main support. The auxiliary support is located above the installation cavity. One end of the elastic member away from the contact bridge abuts against the auxiliary support.

5. The connecting structure between the moving contact and the contact support according to claim 4, characterized in that: The two arc-shaped concave surfaces are symmetrically arranged, and the two arc-shaped concave surfaces extend from bottom to top at the same interval, and then gradually increase the interval to extend to the top surface of the main bracket.

6. The connecting structure of the moving contact and the contact support according to claim 1, characterized in that: Two opposite limiting protrusions are arranged at each opening of the installation cavity, and a space for the moving contact to move up and down is formed between the two limiting protrusions and the bottom surface of the installation cavity.

7. The movable contact and contact support connection structure according to claim 6, characterized in that: A surface of the limiting protrusion opposite to the moving contact is an inclined surface.

8. The connecting structure of the moving contact and the contact support according to claim 1, characterized in that: The elastic member is a spring.

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