Static contact of molded case circuit breaker

Abstract

The utility model relates to a fixed contact of a molded case circuit breaker. The technical problem to be solved by the utility model is to provide the fixed contact of the molded case circuit breaker. According to the technical scheme, the static contact comprises a static contact body, a static contact silver point, a static contact arc striking piece, a connecting screw and a buffer spring, the static contact body comprises a static contact external connection portion, the end portion of the static contact external connection portion is bent and extends in sequence to form a static contact transition portion and a static contact contact portion, the static contact external connection portion is provided with a static contact external connection hole, and the static contact silver point is connected with the static contact arc striking piece. The middle parts of the static contact transition part and the static contact contact part are provided with static contact shunting ports which are communicated with each other. The static contact contact part horizontally extends at the static contact shunting ports to form a contact part butt joint block. The arc striking circular sleeve has the advantages that the arc striking circular sleeve can effectively capture and guide the arc when the moving contact and the static contact are broken, and the arc is guided to the arc chute direction, so that the arc diffusion or disordered arc phenomenon is avoided, and the breaking safety and stability of the circuit breaker are improved.

Description

Technical Field

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

[0002] In existing molded case circuit breakers, an electric arc is generated when the moving and stationary contacts separate. Generally, an arc-initiating component is installed on the stationary contact to guide the arc to the arc-extinguishing grid for rapid extinguishing. However, traditional stationary contact arc-initiating sections are typically simple extension plate structures or single-angle plate structures. The arc's direction is uncontrollable at the moment of disconnection, easily leading to arc spread, random arcing, or arc escape, resulting in insufficient arc extinguishing and even contact erosion and case damage. Furthermore, existing arc-initiating components are mostly welded or rigidly fixed to the stationary contact body, lacking buffer and shock-absorbing structures. Under the mechanical impact and electrodynamic forces of frequent opening and closing of the circuit breaker, the connection is prone to deformation or loosening, affecting arc-initiating performance and contact stability. Therefore, improvements and optimizations are needed 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 for a molded case circuit breaker.

[0004] The technical solution adopted by the stationary contact of the molded case circuit breaker of this utility model is characterized by comprising a stationary contact body, a stationary contact silver point, a stationary contact arc-inducing component, a connecting screw, and a buffer spring. The stationary contact body includes a stationary contact outer portion, the end of which is bent and extended in sequence to form a stationary contact transition portion and a stationary contact portion arranged parallel to the stationary contact outer portion. The stationary contact outer portion is provided with a stationary contact outer hole. The middle of the stationary contact transition portion and the stationary contact portion is provided with a stationary contact shunt port that communicates with each other. The stationary contact portion extends horizontally at the stationary contact shunt port to form a contact portion mating block. The stationary contact silver point is welded to the middle of the contact portion mating block. The contact portion mating block is provided with spring positioning grooves at both ends of the stationary contact silver point. The spring positioning grooves are provided with stationary contact connecting holes.

[0005] The stationary contact arc-initiating component includes an arc-initiating component sleeve. The arc-initiating component sleeve extends from one end near the contact transition portion to form an arc-initiating component mid-section and an inclined arc-initiating component arc-initiating foot. The arc-initiating component sleeve has an arc-initiating component guide hole for the stationary contact silver point and the moving contact silver point to pass through. The bottom of the arc-initiating component sleeve has arc-initiating component mounting feet at both ends of the arc-initiating component guide hole, which are parallel to the contact portion mating block. The arc-initiating component mounting feet have arc-initiating component threaded holes. The connecting screw passes through the stationary contact connecting hole and connects to the arc-initiating component threaded hole. A buffer spring is sleeved on the connecting screw and placed in the spring positioning groove, with one end abutting against the arc-initiating component mounting foot and the other end abutting against the contact portion mating block.

[0006] The inner wall of the arc-guiding hole of the arc-initiating component is provided with a circular inner arc-guiding groove to facilitate the absorption and guidance of the electric arc.

[0007] The contact part is provided with a contact block limiting groove for limiting the position of the stationary contact during silver spot welding.

[0008] The bottom of the contact part mating block is provided with a countersunk groove for the connecting screw to be built into at the static contact communication hole.

[0009] The stationary contact arc-starting component is made of pure copper.

[0010] The advantages of the stationary contact of the molded case circuit breaker of this utility model are: the arc-initiating circular sleeve can effectively capture and guide the arc when the moving and stationary contacts are disconnected, and guide the arc to the direction of the arc-extinguishing grid, thereby avoiding arc spread or random arcing, and improving the disconnection safety and stability of the circuit breaker. Attached Figure Description

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of the stationary contact of the molded case circuit breaker of this utility model;

[0013] Figure 2 This is an exploded view of the stationary contact of the molded case circuit breaker of this utility model;

[0014] Figure 3 This is a front structural diagram of the main body of the stationary contact of this utility model;

[0015] Figure 4 This is a schematic diagram of the back structure of the static contact body of this utility model;

[0016] Figure 5 This is a structural schematic diagram of the static contact arc-inducing component of this utility model. Detailed Implementation

[0017] like Figure 1-5As shown, the molded case circuit breaker stationary contact of this utility model includes a stationary contact body 1, a stationary contact silver point 2, a stationary contact arc-starting component 3, a connecting screw 4, and a buffer spring 5. The stationary contact body 1 includes a stationary contact outer portion 8. The ends of the stationary contact outer portion 8 are successively bent and extended to form a stationary contact transition portion 9 and a stationary contact contact portion 10 arranged parallel to the stationary contact outer portion 8. The stationary contact outer portion 8 is provided with a stationary contact outer hole 11. The stationary contact transition portion 9 and the stationary contact contact portion 10 are provided with interconnected stationary contact holes in the middle. The stationary contact 10 extends horizontally at the stationary contact 12 to form a contact mating block 13. The stationary contact silver point 2 is welded to the middle of the contact mating block 13. The contact mating block 13 has spring positioning grooves 14 at both ends of the stationary contact silver point 2, and a stationary contact connecting hole 15 is provided in the spring positioning grooves 14. The stationary contact arc-starting component 3 includes an arc-starting component sleeve 20. The arc-starting component sleeve 20 extends near the end of the contact transition portion 9 to form an arc-starting component central connection portion 21 and an inclined part. The arc-initiating element has an arc-initiating foot 22. The arc-initiating element sleeve 20 has an arc-initiating element guide hole 23 for the stationary contact silver point 2 and the moving contact silver point to pass through. The bottom of the arc-initiating element sleeve 20 has arc-initiating element mounting feet 24 at both ends of the arc-initiating element guide hole 23, which are parallel to the contact portion mating block 13. The arc-initiating element mounting feet 24 have arc-initiating element threaded holes 25. The connecting screw 4 passes through the stationary contact connecting hole 15 and connects to the arc-initiating element threaded hole 25. The buffer spring 5 is sleeved on the connecting screw 4. It is placed in the spring positioning groove 14, with one end abutting the arc-initiating component mounting foot 24 and the other end abutting the contact part mating block 13. The arc-initiating sleeve 20 can effectively capture and guide the electric arc when the moving and stationary contacts break, guiding the electric arc to the direction of the arc-extinguishing grid, thereby avoiding the phenomenon of arc diffusion or random arc, and improving the breaking safety and stability of the circuit breaker. The structural design of the buffer spring 5 can absorb mechanical and electrodynamic impact forces at the moment of contact opening and closing, reduce contact vibration and structural stress, prevent hard contact, and extend service life.

[0018] The inner wall of the arc-guiding hole 23 of the arc-initiating component is provided with an inner arc-guiding groove 27 in a circular sleeve to facilitate the absorption and guidance of the electric arc. This groove can form a stable magnetic attraction flow channel when the electric arc is generated, enhance the adsorption and extension guidance ability of the electric arc, effectively reduce the arc residence time between contacts, and improve the arc extinguishing efficiency.

[0019] The contact block 13 is provided with a contact block limiting groove 28 for limiting the position of the stationary contact silver point 2 during welding. This provides an accurate positioning reference, ensures the stability of the silver point welding position, and avoids uneven contact and arc deviation caused by offset.

[0020] The bottom of the contact block 13 is provided with a countersunk groove 29 for the connecting screw 4 to be built into the stationary contact communication hole 15, so as to avoid the risk of discharge or external force damage caused by the exposed screw head, while improving the assembly compactness and overall safety performance.

[0021] The stationary contact arc-starting component 3 is made of pure copper, which has good conductivity and strong oxidation resistance, and can effectively reduce electrical contact resistance.

[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 stationary contact, characterized by: The static contactor includes a static contactor main body (1), a static contactor silver point (2), a static contactor arc striking piece (3), a connecting screw (4) and a buffer spring (5). The static contactor main body (1) includes a static contactor external connecting part (8). The end of the static contactor external connecting part (8) is bent and extended to form a static contactor transition part (9) and a static contactor contact part (10) arranged in parallel with the static contactor external connecting part (8). The static contactor external connecting part (8) is provided with a static contactor external connecting hole (11). The static contactor transition part (9) and the static contactor contact part (10) are provided with a static contactor shunt (12) in communication with each other in the middle. The static contactor contact part (10) is horizontally extended to form a contact part butt joint block (13) at the static contactor shunt (12). The static contactor silver point (2) is welded in the middle of the contact part butt joint block (13). The contact part butt joint block (13) is provided with a spring positioning groove (14) at both ends of the static contactor silver point (2). The spring positioning groove (14) is provided with a static contactor communication hole (15). The static contactor arc striking piece (3) includes an arc striking piece circular sleeve (20). The arc striking piece circular sleeve (20) is extended to form an arc striking piece middle connecting part (21) and an arc striking piece arc striking foot (22) arranged obliquely near one end of the contactor transition part (9). The arc striking piece circular sleeve (20) is provided with an arc striking piece arc guiding hole (23) for the static contactor silver point (2) and the moving contactor silver point. The bottom of the arc striking piece circular sleeve (20) is provided with an arc striking piece mounting foot (24) arranged in parallel with the contact part butt joint block (13) at both ends of the arc striking piece arc guiding hole (23). The arc striking piece mounting foot (24) is provided with an arc striking piece threaded hole (25). The connecting screw (4) is connected with the arc striking piece threaded hole (25) after passing through the static contactor communication hole (15). The buffer spring (5) is sleeved on the connecting screw (4) and is placed in the spring positioning groove (14) with one end abutting against the arc striking piece mounting foot (24) and the other end abutting against the contact part butt joint block (13).

2. The molded case circuit breaker stationary contact of claim 1, wherein: The inner wall of the arc striking piece arc guiding hole (23) is provided with a circular sleeve arc guiding groove (27) for absorbing and guiding the electric arc.

3. The molded case circuit breaker static contact of claim 1, wherein: The contact part butt joint block (13) is provided with a butt joint block limiting groove (28) for limiting the static contactor silver point (2) during welding.

4. The molded case circuit breaker static contact of claim 1, wherein: The bottom of the contact part butt joint block (13) is provided with a butt joint block counterbore groove (29) for the built-in connecting screw (4) at the static contactor communication hole (15).

5. The molded case circuit breaker static contact of claim 1, wherein: The static contactor arc striking piece (3) is made of pure copper.

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