Molded case circuit breaker static contact with arc striking function

Abstract

The utility model relates to a molded case circuit breaker static contact with an arc striking function. The technical problem to be solved by the utility model is to provide a molded case circuit breaker static contact with an arc striking function. According to the technical scheme, the static contact comprises a static contact, an arc striking reinforcing piece and a silver point, the static contact comprises a static contact external connection portion, the static contact external connection portion is sequentially bent to form a static contact connection portion and a static contact bearing portion, the static contact connection portion is arranged obliquely downwards, and the static contact bearing portion is parallel to the static contact external connection portion. The static contact bearing part is bent inwards to form a static contact transition part and a static contact contact part, the front end of the static contact contact part is provided with the silver point, and the middle part of the static contact connecting part is provided with a shunting port. The advantages of the utility model are that through the design of the static contact arc striking part and the arc striking reinforcing member, the rapid guiding and taking-away of the arc are realized, the retention time of the arc at the butt joint of the silver points is obviously shortened, the damage of the arc to the silver points is reduced, and the service life of the silver points is prolonged.

Description

Technical Field

[0001] This utility model relates to a stationary contact of a molded case circuit breaker with arc-starting function. Background Technology

[0002] Molded case circuit breakers (MCCBs) bear the dual responsibility of protecting and controlling circuits, playing a crucial role in the safety, reliability, and practicality of the entire circuit system. The stationary contact is a vital component of the circuit breaker. When the moving contact separates from the stationary contact, an electric arc is generated between them. Existing MCCBs have poor arc-initiating performance in their stationary contacts, failing to quickly remove the arc from the silver contact joint. Traditional stationary contacts lack effective arc-initiating structures or have poor arc-initiating performance, causing the arc to linger at the silver contact joint for an extended period. This continuous arc action on the silver contact accelerates oxidation and burn-off, reducing its lifespan. Furthermore, traditional stationary contacts lack effective support for the contact area, making them prone to displacement during frequent contact with the moving contact. This increases the contact distance, leading to a larger arc, increased contact resistance between contacts, reduced breaking capacity, and excessive localized temperature rise, posing safety hazards. 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 stationary contact of a molded case circuit breaker with arc-initiating function.

[0004] The technical solution adopted by the stationary contact of the molded case circuit breaker with arc-initiating function of this utility model is characterized by including a stationary contact, an arc-initiating reinforcement, and a silver dot. The stationary contact includes an outer part of the stationary contact, which is bent in sequence to form a stationary contact connecting part that is obliquely downward and a stationary contact receiving part that is parallel to the outer part of the stationary contact. The stationary contact receiving part is bent inward to form a stationary contact transition part and a stationary contact contact part. The silver dot is provided at the front end of the stationary contact contact part. A shunt port is provided in the middle of the stationary contact connecting part. The outer part of the stationary contact is bent and extended near the shunt port to form a stationary contact arc-initiating part that is parallel to the outer part of the stationary contact and is used for arc initiation at the front end of the stationary contact contact part.

[0005] The arc-inducing reinforcement is detachably fixed to the stationary contact receiving part. The arc-inducing reinforcement includes an arc-inducing bottom arranged parallel to the stationary contact receiving part. One end of the arc-inducing bottom is bent vertically upward to form an arc-inducing support part abutting against the back of the stationary contact contact part. The other end is bent in sequence to form an inclined arc-inducing extension part and an arc-inducing connecting part that abuts against the back of the stationary contact arc-inducing part. The stationary contact receiving part is provided with a stationary contact first limiting port for the arc-inducing support part to pass through and a stationary contact clearance port that communicates with the diversion port and is used for the arc-inducing extension part to pass through and make way.

[0006] The arc-starting component connecting part is vertically bent at the front and rear sides to form an arc-starting component stop that wraps around both sides of the front end of the stationary contact part.

[0007] The back of the stationary contact portion is provided with a contact portion positioning groove for positioning the arc-starting component support portion.

[0008] The arc-drawing portion of the stationary contact is higher than the front end of the contact portion of the stationary contact.

[0009] The arc-initiating extension is arranged parallel to the stationary contact connection.

[0010] The back of the stationary contact arc-initiating part is provided with an arc-initiating part positioning groove for positioning the end of the arc-initiating component connection part.

[0011] The front end of the stationary contact part is provided with a silver spot positioning groove to facilitate positioning during silver spot welding.

[0012] The outer part of the stationary contact is provided with anti-slip texture.

[0013] The advantages of this novel molded case circuit breaker stationary contact with arc-initiating function are as follows: The design of the arc-initiating part and the arc-initiating reinforcement in the stationary contact enables rapid guidance and removal of the electric arc, significantly shortening the arc's dwell time at the silver contact point, reducing arc damage to the silver contact, and extending the service life of the silver contact. Furthermore, the supporting function of the arc-initiating reinforcement effectively prevents displacement of the stationary contact part during frequent contact with the moving contact, maintaining a stable contact distance and reducing arcing caused by displacement.

[0014] The increased size and excessive temperature rise significantly improved the breaking capacity and safety of the circuit breaker. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of the stationary contact of the molded case circuit breaker of this utility model;

[0017] Figure 2 This is a front structural diagram of the stationary contact of this utility model;

[0018] Figure 3 This is a schematic diagram of the arc-inducing reinforcement component of this utility model;

[0019] Figure 4 This is a schematic diagram of the back structure of the stationary contact of this utility model. Detailed Implementation

[0020] like Figure 1-4As shown, the molded case circuit breaker stationary contact with arc-initiating function involved in this utility model includes a stationary contact 1, an arc-initiating reinforcement 2, and a silver dot 3. The stationary contact 1 includes a stationary contact outer portion 5, which is bent in sequence to form a stationary contact connecting portion 6 arranged obliquely downward and a stationary contact receiving portion 7 arranged parallel to the stationary contact outer portion 5. The stationary contact receiving portion 7 is bent inward to form a stationary contact transition portion 8 and a stationary contact contact portion 9. The silver dot 3 is provided at the front end of the stationary contact contact portion 9. The stationary contact connection portion 6 has a flow divider 11 in the middle. The stationary contact outer portion 5 is bent and extended near the flow divider 11 to form a stationary contact arc-inducing portion 12, which is parallel to the stationary contact outer portion 5 and is used for arc-inducing at the front end of the stationary contact contact portion 9. The arc-inducing reinforcement 2 is detachably fixed to the stationary contact receiving portion 7. The arc-inducing reinforcement 2 includes an arc-inducing bottom 14, which is parallel to the stationary contact receiving portion 7. One end of the arc-inducing bottom 14 is bent vertically upward. An arc-starting member support portion 15 abuts against the back of the stationary contact portion 9. Its other end is successively bent to form an inclined arc-starting member extension portion 16 and an arc-starting member connecting portion 17 that abuts against the back of the stationary contact arc-starting portion 12. The stationary contact receiving portion 7 is provided with a stationary contact first limiting port 19 for the arc-starting member support portion 15 to pass through, and a stationary contact clearance port 20 communicating with the diversion port 11 and for the arc-starting member extension portion 16 to pass through and make room. The arc-starting member 2 connects to the stationary contact arc-starting member. The arc section 12 connects and quickly removes the arc at the junction of the silver point 3, shortening the time the arc stays at the junction of the silver point 3, reducing damage to the silver point 3 from the arc column, further improving the service life of the silver point 3, and significantly reducing the overall temperature rise. In addition, the arc-initiating support section 15 can provide support for the stationary contact section 9, effectively preventing the stationary contact 1 from shifting after being frequently touched by the moving contact, which would increase the contact distance, leading to an increase in arc and temperature rise, thereby improving the breaking capacity of the circuit breaker and enhancing safety.

[0021] The arc-initiating component connecting part 17 is vertically bent on the front and rear sides to form an arc-initiating component stop part 22 that wraps around both sides of the front end of the stationary contact part 9.

[0022] The back of the stationary contact part 9 is provided with a contact part positioning groove 23 for positioning the arc-starting component support part 15, which ensures accurate positioning and high structural stability.

[0023] The arc-leading portion 12 of the stationary contact is higher than the front end of the contact portion 9 of the stationary contact.

[0024] The arc-initiating extension 16 is arranged parallel to the stationary contact connection 6, so that the arc transmission remains stable.

[0025] The back of the stationary contact arc-inducing part 12 is provided with an arc-inducing part positioning groove 24 for positioning the end of the arc-inducing component connecting part 17, which ensures the precise docking of the arc-inducing reinforcement 2 and the stationary contact arc-inducing part 12.

[0026] The front end of the stationary contact part 9 is provided with a silver point positioning groove 26 to facilitate the positioning of the silver point 3 during welding, which facilitates the precise positioning of the silver point 3 during welding.

[0027] The stationary contact outer part 5 is provided with stationary contact anti-slip texture 27, which improves the grip and stability of the stationary contact during installation.

[0028] 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 stationary contact of a molded case circuit breaker with arc-starting function, characterized in that: The device includes a stationary contact (1), an arc-starting reinforcement (2), and a silver dot (3). The stationary contact (1) includes a stationary contact outer part (5). The stationary contact outer part (5) is bent in sequence to form a stationary contact connecting part (6) arranged obliquely downward and a stationary contact receiving part (7) arranged parallel to the stationary contact outer part (5). The stationary contact receiving part (7) is bent inward to form a stationary contact transition part (8) and a stationary contact contact part (9). The silver dot (3) is provided at the front end of the stationary contact contact part (9). A flow divider (11) is provided in the middle of the stationary contact connecting part (6). The stationary contact outer part (5) is bent and extended near the flow divider (11) to form a stationary contact arc-starting part (12) arranged parallel to the stationary contact outer part (5) and used for arc-starting at the front end of the stationary contact contact part (9). The arc-inducing reinforcement (2) is detachably fixed to the stationary contact receiving part (7). The arc-inducing reinforcement (2) includes an arc-inducing bottom (14) arranged parallel to the stationary contact receiving part (7). One end of the arc-inducing bottom (14) is bent vertically upward to form an arc-inducing support part (15) that abuts against the back of the stationary contact contact part (9). The other end is bent in sequence to form an inclined arc-inducing extension part (16) and an arc-inducing connecting part (17) that is connected to the back of the stationary contact arc-inducing part (12). The stationary contact receiving part (7) is provided with a stationary contact first limiting port (19) for the arc-inducing support part (15) to pass through, and a stationary contact clearance port (20) that is connected to the diversion port (11) and is used for the arc-inducing extension part (16) to pass through and make room.

2. The stationary contact of the molded case circuit breaker with arc-starting function according to claim 1, characterized in that: The arc-starting component connecting part (17) is bent vertically on the front and rear sides to form an arc-starting component stop (22) that wraps around the front sides of the stationary contact part (9).

3. The stationary contact of the molded case circuit breaker with arc-starting function according to claim 1, characterized in that: The back of the stationary contact part (9) is provided with a contact part positioning groove (23) for positioning the arc-starting support part (15).

4. The stationary contact of the molded case circuit breaker with arc-starting function according to claim 1, characterized in that: The arc-leading portion (12) of the stationary contact is higher than the front end of the contact portion (9) of the stationary contact.

5. The stationary contact of the molded case circuit breaker with arc-starting function according to claim 1, characterized in that: The arc-starting extension (16) is arranged parallel to the stationary contact connection (6).

6. The stationary contact of the molded case circuit breaker with arc-starting function according to claim 1, characterized in that: The back of the stationary contact arc-starting part (12) is provided with an arc-starting part positioning groove (24) for positioning the end of the arc-starting part connecting part (17).

7. The stationary contact of the molded case circuit breaker with arc-starting function according to claim 1, characterized in that: The front end of the stationary contact part (9) is provided with a silver point positioning groove (26) to facilitate the positioning of the silver point (3) during welding.

8. The stationary contact of the molded case circuit breaker with arc-starting function according to claim 1, characterized in that: The stationary contact outer part (5) is provided with stationary contact anti-slip texture (27).

Images