Contact mechanism based on low-voltage switch

Abstract

The utility model discloses a contact mechanism based on a low-voltage switch, and aims to solve the problem that in the prior art, when a pin shaft is rotatably assembled with a through hole in a movable contact piece, the movable contact piece is inconvenient to use due to concentricity error, the contact mechanism of the application comprises a movable contact piece, one end of which is provided with a rotary hook which is integrally bent and formed; the contact seat is provided with an elastic reset piece used for fixing the movable contact piece, the elastic reset piece abuts against the back face of the movable contact piece, the contact seat is further provided with a limiting groove matched with the rotating hook in a rotating mode, and the movable contact piece can rotate on the contact seat. The rotary matching of the rotary hook and the limiting groove replaces the rotary matching of a pin shaft in the traditional technology, the problem of different concentricity caused by process errors is solved, and the assembly can be completed through the torsion spring, so that the assembly is very reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliance switches, in particular to a contact mechanism based on a low-voltage switch. Background Art

[0002] This type of contact mechanism is generally used in small low-voltage switchgear such as small circuit breakers and surge backup protectors. In traditional moving contact assemblies, the contact seat and the moving contact piece are rotated together by inserting a rotating shaft. However, due to process errors in actual production, the concentricity of each contact piece through hole cannot be the same as the rotating shaft, which easily causes the moving contact assembly to jam or lag in actual use, which is inconvenient. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In order to solve the above problems, the utility model proposes a contact mechanism with simple structure, reliable performance, convenient assembly and high production efficiency.

[0005] (II) Technical solution

[0006] The utility model provides a contact mechanism based on a low-voltage switch, comprising:

[0007] The moving contact piece has an integrally bent rotating hook at one end;

[0008] The contact seat is provided with an elastic reset member for fixing the moving contact piece, the elastic reset member abuts against the back of the moving contact piece, and the contact seat is also provided with a limiting groove for rotationally cooperating with the rotating hook, and the moving contact piece can rotate on the contact seat.

[0009] In the utility model, bosses are provided on both sides of the contact seat, the elastic reset member is a torsion spring, and rings are provided at both ends of the torsion spring. The torsion spring is connected to the bosses through the rings and presses the movable contact piece onto the contact seat.

[0010] In the utility model, the torsion spring is a U-shaped structure.

[0011] In the utility model, a limit arm extending downward is provided near one end of the movable contact piece of the contact seat, a compression spring is provided between the limit arm and the movable contact piece, one end of the compression spring abuts against the movable contact piece, and the other end is connected to the limit arm.

[0012] In the utility model, the limit arm and the contact seat are an integrated structure, and a protrusion for preventing the torsion spring from deflecting is also provided on a side surface of the limit arm close to the movable contact piece.

[0013] In the utility model, the limiting groove is also provided with a rounded corner in contact with the rotating hook.

[0014] In the utility model, the rotating hook includes a curved section, a main body of a moving contact piece, and a segment B arranged at the other end of the curved section, wherein the angle α between the main body and segment B is greater than the angle β between the bottom surface of the limiting groove and the contact surface of the moving contact piece.

[0015] In the utility model, a bending portion is further provided on the moving contact piece, and a reinforcing rib for increasing the structural strength is further provided on the bending portion.

[0016] In the utility model, the bending portion is a Z-shaped bend.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] (1) The present invention replaces the conventional pin rotational fit by the rotational fit of the rotating hook and the limiting groove, and is no longer limited by the problem of different concentricities caused by process errors. Moreover, the assembly can be completed by the torsion spring, which is very reliable.

[0020] (2) In the present invention, the movable contact piece can be assembled on the contact seat by means of a torsion spring. Compared with the contact mechanism in the prior art, not only the number of parts is reduced, but also the simplicity of assembly is greatly improved, and the production efficiency is further improved, which is very reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the contact mechanism in Example 1;

[0023] Figure 2 is a schematic diagram of the three-dimensional structure of the moving contact piece in Example 1;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the contact base in Example 1;

[0025] Figure 4 is a schematic cross-sectional structure diagram of the contact mechanism in Example 1;

[0026] Figure 5 It is a schematic diagram of the partial structure of the contact mechanism in Example 1;

[0027] Figure 6is a schematic diagram of the three-dimensional structure of the contact mechanism in Example 2;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the contact seat in Example 2.

[0029] 10. contact seat, 101. limiting groove, 1011. fillet, 102. convex column, 11. moving contact piece, 111. rotating hook, 1111. bending section, 1112. B section, 1113. body, 112. bending part, 113. reinforcing rib, 114. limiting arm, 1141. protrusion, 12. torsion spring, 121. collar, 13. compression spring, DETAILED DESCRIPTION

[0030] Compared to the embodiments shown in the drawings, feasible implementations within the scope of the present disclosure may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0031] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate quantity restrictions. Words such as "include", "comprise" or "have" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to the physical or mechanical connections or connections shown in the drawings, but may include equivalent connections or connections, whether direct or indirect. "Up", "down", "left", "right", "horizontal", "vertical" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Example 1

[0034] like Figure 1The contact mechanism based on the low-voltage switch shown in the figure comprises a contact base 10, a movable contact piece 11 rotatably mounted on the contact base 10, and a torsion spring 12 for fixing the movable contact piece 11. The top of the movable contact piece 11 is provided with an integrally bent rotating hook 111, and a limiting groove 101 for connecting the rotating hook 111 is provided on the contact base 10. Figure 1-Figure 2 The cooperation between the rotating hook 111 and the limiting groove 101 replaces the traditional contact mechanism that connects the contact base 10 and the movable contact piece 11 through the pin shaft, and there is no need to consider the concentricity problem, so that the rotation of the movable contact piece 11 is more reliable and easy to assemble. In this embodiment, the elastic limiting member is the torsion spring 12.

[0035] Specifically, a boss 102 for mounting the torsion spring 12 is provided on both sides of the contact seat 10. The boss 102 may be a column integrally formed with the contact seat 10, or may be a detachable pin. The torsion spring 12 is a "U"-shaped structure, with collars 121 provided at both ends thereof, and the collars 121 are mounted on the boss 102 for positioning. When in use, the moving contact piece 11 is fixed to the contact seat 10 by the end of the torsion spring 12, that is, the torsion spring 12 abuts against the back of the moving contact piece 11, providing sufficient pressure for the moving contact piece 11, thereby increasing its friction. Compared with the traditional process of rotating connection through a pin, this installation method is not only easier to assemble and has higher consistency, but is also very convenient to install, further improving production efficiency.

[0036] It should be noted that the end of the torsion spring 12 abuts against the back of the movable contact piece 11, and the contact point between the torsion spring 12 and the movable contact piece 11 should be below the rotating hook 111, that is, below the rotation fulcrum. The farther the distance between the contact point and the rotation fulcrum, the longer the force arm. In this embodiment, the torsion spring 12 abuts against the back of the upper part of the movable contact piece 11.

[0037] like Figure 2 As shown, a bending portion 112 is provided at the lower part of the movable contact piece 11, and the bending portion 112 is provided to increase the contact speed between the movable contact piece 11 and the stationary contact and to increase the overall structural strength of the movable contact piece 11. Furthermore, a reinforcing rib 113 for increasing the structural strength is provided on the front of the bending portion 112. By providing the bending portion 112 and the reinforcing rib 113, the structural strength of the movable contact piece 11 and the anti-deformation ability of the movable contact piece 11 are increased from two aspects, and the possibility of deformation of the movable contact piece 11 due to impact during actual use is effectively prevented, which is very reliable.

[0038] like Figure 3-Figure 4As shown, the limiting groove 101 is also provided with a rounded corner 1011 whose curvature is similar to the bending curvature of the rotating hook 111. The moving contact piece 11 is hung in the limiting groove 101 through the rotating hook 111, and the rounded corner 1011 is in contact with the curved surface of the rotating hook 111. The moving contact piece 11 can be rotated at a certain angle through the cooperation between the rotating hook 111 and the rounded corner 1011 of the limiting groove 101.

[0039] Specifically, Figure 2 , Figure 4 As shown, the rotating hook 111 includes a curved section 1111 and a B section 1112 extending to the other end, and the other end of the curved section 1111 is the body 1113 of the moving contact piece 11, wherein, as shown Figure 4-Figure 5 As shown, the angle α between the body 1113 and the B segment 1112 should be greater than the angle β between the bottom surface of the limiting groove 101 and the contact surface of the movable contact piece 11, and the difference between α and β is the rotatable angle value of the movable contact piece 11. In this embodiment, the value of β is 90°, and the value of α is 110°, that is, the rotatable angle of the movable contact piece 11 is about 20°.

[0040] Example 2

[0041] like Figure 6-7 As shown, the difference from the embodiment 1 is that the head-out mechanism in this embodiment includes a contact seat 10, a movable contact piece 11 and a compression spring 13 for abutting the movable contact piece 11, wherein the structure of the movable contact piece 11 is the same as that in the embodiment 1, and the structures of the limiting groove 101 and the rotating hook 111 are also the same. The difference is that a limiting arm 114 extending vertically downward is provided on the back of the contact seat 10, and a compression spring 13 is provided between the limiting arm and the movable contact piece 11. In this embodiment, the elastic limiting member is the compression spring 13.

[0042] Specifically, one end of the compression spring 13 abuts against the back of the moving contact piece 11, and the other end abuts against the limit arm. When the static contact contacts the moving contact piece 11, the moving contact piece 11 rotates counterclockwise by a certain angle, and the moving contact piece 11 is reset under the action of the compression spring 13.

[0043] A protrusion 1141 for connecting and limiting one end of the spring is also provided on the limiting arm, and a corresponding protrusion may also be provided on the back of the movable contact piece 11 to prevent the compression spring 13 from deflecting during use.

[0044] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A contact mechanism based on a low-voltage switch, It is characterized in that include: The moving contact piece has an integrally bent rotating hook at one end; The contact seat is provided with an elastic reset member for fixing the moving contact piece, the elastic reset member abuts against the back of the moving contact piece, and the contact seat is also provided with a limiting groove for rotationally cooperating with the rotating hook, and the moving contact piece can rotate on the contact seat.

2. The contact mechanism based on the low-voltage switch according to claim 1, It is characterized in that Both sides of the contact seat are provided with convex columns, the elastic reset member is a torsion spring, and both ends of the torsion spring are provided with collars respectively, the torsion spring is connected with the convex columns through the collar and presses the movable contact piece onto the contact seat.

3. The contact mechanism based on the low-voltage switch according to claim 2, It is characterized in that The torsion spring is a U-shaped structure.

4. The contact mechanism based on the low-voltage switch according to claim 1, It is characterized in that A limit arm extending downward is provided at one end of the contact seat close to the moving contact piece, a compression spring is provided between the limit arm and the moving contact piece, one end of the compression spring abuts against the moving contact piece, and the other end is connected to the limit arm.

5. The contact mechanism based on the low-voltage switch according to claim 4, It is characterized in that The limit arm and the contact seat are an integrated structure, and a protrusion for preventing the torsion spring from deflecting is also provided on a side surface of the limit arm close to the movable contact piece.

6. The contact mechanism based on the low-voltage switch according to any one of claims 1 to 5, It is characterized in that The limiting groove is also provided with a rounded corner that contacts the rotating hook.

7. The contact mechanism based on the low voltage switch according to claim 6, It is characterized in that The rotary hook comprises a curved section, a main body of a movable contact piece and a segment B arranged at the other end of the curved section, wherein an angle α between the main body and segment B is greater than an angle β between the bottom surface of the limiting groove and a contact surface of the movable contact piece.

8. The contact mechanism based on the low-voltage switch according to claim 1 or 7, It is characterized in that The movable contact piece is also provided with a bending portion, and the bending portion is also provided with a reinforcing rib for increasing the structural strength.

9. The contact mechanism based on the low voltage switch according to claim 8, It is characterized in that The bending portion is a Z-shaped bending portion.

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