Moving contact of molded case circuit breaker

Abstract

The utility model relates to a moving contact of a molded case circuit breaker. The technical problem to be solved by the utility model is to provide the moving contact of the molded case circuit breaker. According to the technical scheme, the moving contact comprises a moving contact body, a silver point seat block, a moving contact silver point, a locking plate and a connecting pin, the moving contact body comprises a moving contact rotating part, a moving contact transition part and a moving contact butt joint part, a moving contact positioning groove is formed in the upper end face of the moving contact butt joint part, a moving contact inserting port is formed in the moving contact positioning groove, and the moving contact silver point is inserted into the moving contact inserting port. The silver point seat block comprises a seat block bearing part and a seat block limiting part perpendicular to the seat block bearing part, and a seat block limiting groove used for limiting when the moving contact silver point is placed in is formed in the seat block bearing part. Compared with the prior art, the moving contact has the advantages that a mechanical riveting and plugging fixing structure is adopted, large-area welding procedures are reduced, thermal damage or deformation of the surface of the moving contact caused by high welding temperature is avoided, and the surface smoothness and the electric contact performance of the contact are effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to a moving contact of a molded case circuit breaker. Background Technology

[0002] Existing molded case circuit breaker moving contacts typically consist of a moving contact body, contact points, and mounting components. When current is switched on and off, a high-temperature arc is generated between the moving and stationary contacts, which can easily cause the moving and stationary contacts to stick together, resulting in contact burn-out or even fusion, affecting the reliable breaking performance of the circuit breaker. Traditional moving contacts are mostly fixed by welding. Although the structure is simple, under the conditions of frequent circuit breaker operation, long-term heat exposure, and arc impact, the welded points are prone to loosening or deformation, causing the moving contact position to shift, reducing contact stability, and leading to poor conductivity or localized overheating. Furthermore, replacing or repairing the moving contact requires complete disassembly and welding, making maintenance complex and replacement costly. Therefore, improvements and optimizations are proposed to address these issues. Utility Model Content

[0003] To solve the above problems, the technical problem to be solved by this utility model is to provide a moving contact for a molded case circuit breaker.

[0004] The technical solution adopted by the moving contact of this utility model molded case circuit breaker is characterized by comprising a moving contact body, a silver dot seat block, a moving contact silver dot, a locking plate, and a connecting pin. The moving contact body includes a moving contact rotating part, a moving contact transition part, and a moving contact mating part. The upper end face of the moving contact mating part is provided with a moving contact positioning groove, and a moving contact insertion interface is provided in the moving contact positioning groove. The silver dot seat block includes a seat block receiving part and a seat block limiting part arranged perpendicularly to the seat block receiving part. The seat block receiving part is provided with a seat block limiting groove for limiting the movement of the moving contact silver dot when it is inserted. A silver dot insertion port is provided on the side of the moving contact silver dot. A base block socket is provided corresponding to the silver dot socket. The base block limiting part is provided with a base block riveting hole. The moving contact docking part is provided with a moving contact riveting hole on the front and rear sides. The base block receiving part is attached to the moving contact positioning groove. After the base block limiting part is inserted into the moving contact socket, the connecting pin rivets the moving contact riveting hole and the base block riveting hole together. After the moving contact silver dot is placed in the base block limiting groove, the locking plate is inserted into the base block socket and the silver dot socket in sequence, and then the moving contact silver dot and the base block receiving part are spot welded.

[0005] The seat block limiting part is provided with a seat block insertion port that runs through the left and right sides.

[0006] The moving contact mating part is provided with a moving contact guide groove at the outer end of the moving contact positioning groove, and the bottom of the locking plate is provided with a locking block guide block corresponding to the moving contact guide groove. The locking plate is inserted into the seat block socket and the silver dot socket in sequence from one side of the moving contact guide groove.

[0007] The number of riveting holes for the seat block and the number of riveting holes for the moving contact are both two.

[0008] The moving contact body, the silver dot base block, the locking plate, and the connecting pin are all made of pure copper.

[0009] The advantages of the moving contact of this utility model molded case circuit breaker are as follows: the mechanical riveting and plug-in fixing structure is adopted, which reduces the large-area welding process and avoids thermal damage or deformation of the moving contact surface caused by high welding temperature, thus effectively ensuring the surface smoothness and electrical contact performance of the contact; the overall assembly process is more orderly and highly detachable, and the locking plate can be easily removed when the silver contact is repaired or replaced in the later stage, reducing maintenance costs. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0011] Figure 1 This is a schematic diagram of the structure of the moving contact of the molded case circuit breaker of this utility model;

[0012] Figure 2 This is an exploded view of the moving contact of the molded case circuit breaker of this utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the moving contact body of this utility model;

[0014] Figure 4 This is a schematic diagram of the structure of the silver dot seat block of this utility model;

[0015] Figure 5 This is a schematic diagram of the structure of the moving contact silver point of this utility model;

[0016] Figure 6 This is a schematic diagram of the structure of the lock plate of this utility model. Detailed Implementation

[0017] like Figure 1-6As shown, the moving contact of the molded case circuit breaker of this utility model includes a moving contact body 1, a silver contact seat block 2, a moving contact silver contact 3, a locking plate 4, and a connecting pin 5. The moving contact body 1 includes a moving contact rotating part 8, a moving contact transition part 9, and a moving contact mating part 10. The upper end surface of the moving contact mating part 10 is provided with a moving contact positioning groove 11, and a moving contact insertion interface 12 is provided in the moving contact positioning groove 11. The silver contact seat block 2 includes a seat block receiving part 13 and a connecting part 13. 3. A vertically arranged seat block limiting part 14, the seat block receiving part 13 is provided with a seat block limiting groove 15 for limiting the movement contact silver point 3 when it is inserted, the movement contact silver point 3 is provided with a silver point insertion port 16 on its side, the seat block receiving part 13 is provided with a seat block insertion port 17 corresponding to the silver point insertion port 16, the seat block limiting part 14 is provided with a seat block riveting hole 19, the movement contact docking part 10 is provided with a movement contact riveting hole 20 on its front and rear sides, and the seat block receiving part 13 fits against the... After the seat block limiting part 14 is inserted into the moving contact insertion interface 12 on the moving contact positioning groove 11, the connecting pin 5 rivets the moving contact riveting hole 20 and the seat block riveting hole 19 together. After the moving contact silver point 3 is placed in the seat block limiting groove 15, the locking plate 4 is sequentially inserted into the seat block insertion port 17 and the silver point insertion port 16. Then, the moving contact silver point 3 and the seat block receiving part 13 are spot welded. The seat block limiting groove 15 is used to precisely limit the position of the moving contact silver point 3, which can prevent the silver point from loosening or shifting after long-term on / off arc impact, thereby improving the service life and reliability of the contact. The mechanical riveting and insertion fixing structure is changed to reduce the large-area welding process and avoid the high temperature of welding from causing thermal damage or deformation to the surface of the moving contact, so as to effectively ensure the surface smoothness and electrical contact performance of the contact. The overall assembly process is more orderly and highly detachable. The locking plate can be easily disassembled when repairing or replacing the silver point in the later stage, reducing maintenance costs.

[0018] The seat block limiting part 14 is provided with a seat block insertion port 17 that runs through the left and right sides.

[0019] The moving contact mating part 10 is provided with a moving contact guide groove 22 at the outer end of the moving contact positioning groove 11. The bottom of the locking plate 4 is provided with a locking block guide block 23 corresponding to the moving contact guide groove 22. The locking plate 4 is inserted into the seat block socket 17 and the silver dot socket 16 from one side of the moving contact guide groove 22 to form a guide insertion structure, which makes the assembly process smoother and more precise.

[0020] The number of the seat block riveting hole 19 and the number of the moving contact riveting hole 20 are both two. The force is distributed by the double-point riveting method, which improves the seismic performance and mechanical stability of the overall structure and meets the working requirements of the circuit breaker in the frequent switching and vibration environment.

[0021] The moving contact body 1, the silver dot base block 2, the locking plate 4, and the connecting pin 5 are all made of pure copper, which has excellent conductivity and oxidation resistance, reduces contact resistance, and improves power-on stability and service life.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. A molded case circuit breaker movable contact, characterized by: The application relates to a movable contact head, which comprises a movable contact head body (1), a silver point base block (2), a movable contact head silver point (3), a lock plate (4) and a connecting pin (5), wherein the movable contact head body (1) comprises a movable contact head rotating part (8), a movable contact head transition part (9) and a movable contact head butt joint part (10), the upper end surface of the movable contact head butt joint part (10) is provided with a movable contact head positioning groove (11), the movable contact head positioning groove (11) is internally provided with a movable contact head plug-in port (12), the silver point base block (2) comprises a base block receiving part (13) and a base block limiting part (14) which is vertically arranged on the base block receiving part (13), the base block receiving part (13) is internally provided with a base block limiting groove (15) for limiting the movable contact head silver point (3) when being placed, the side part of the movable contact head silver point (3) is provided with a silver point plug-in port (16), the base block receiving part (13) is provided with a base block plug-in port (17) corresponding to the silver point plug-in port (16), the base block limiting part (14) is provided with a base block riveting hole (19), the base block receiving part (13) is attached to the movable contact head positioning groove (11), after the base block limiting part (14) is inserted into the movable contact head plug-in port (12), the connecting pin (5) rivets the movable contact head riveting hole (20) and the base block riveting hole (19) together, after the movable contact head silver point (3) is placed in the base block limiting groove (15), the lock plate (4) is sequentially inserted into the base block plug-in port (17) and the silver point plug-in port (16), and then the movable contact head silver point (3) and the base block receiving part (13) are spot-welded.

2. The molded case circuit breaker moving contact of claim 1, wherein: The base block limiting part (14) is provided with the base block plug-in port (17) which is arranged through the left and right sides.

3. The molded case circuit breaker moving contact of claim 2, wherein: The movable contact head butt joint part (10) is provided with a movable contact head guide groove (22) at the outer end of the movable contact head positioning groove (11), the bottom of the lock plate (4) is provided with a lock block guide block (23) corresponding to the movable contact head guide groove (22), and the lock plate (4) is sequentially inserted into the base block plug-in port (17) and the silver point plug-in port (16) from the side of the movable contact head guide groove (22).

4. The molded case circuit breaker moving contact of claim 1, wherein: The number of the base block riveting hole (19) and the movable contact head riveting hole (20) is two.

5. The molded case circuit breaker moving contact of claim 1, wherein: The movable contact head body (1), the silver point base block (2), the lock plate (4) and the connecting pin (5) are all made of pure copper.

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