A static contact arc extinguishing module for a high breaking capacity circuit breaker

Abstract

This utility model belongs to the field of circuit breakers, specifically relating to a stationary contact arc-extinguishing module for a high breaking capacity circuit breaker. It includes a stationary contact, an arc-extinguishing chamber, and a magnetizing component. An insulating cover is provided on the contact end of the stationary contact. A strip-shaped hole extending along the current direction is opened on the contact end of the stationary contact. The end of the strip-shaped hole is bent upwards to form a cantilevered contact piece. The contact piece extends into the arc-extinguishing channel and is provided with a stationary contact point. A clamping space is formed between the contact piece and the contact end body. The magnetizing component includes a support portion secured within the clamping space, two magnetizing pieces extending horizontally outwards from both sides of the support portion and exposed outside the insulating cover, and an arc-inducing piece extending upwards from the support portion. The two magnetizing pieces are distributed on both sides of the stationary contact. The arc-inducing piece passes through the arc-extinguishing channel and extends into the arc-extinguishing chamber. The magnetizing component adopts an integrated molding structure design, integrating the support portion, magnetizing pieces, and arc-inducing piece into a single component. This results in a compact structure and optimized magnetic field path, achieving efficient magnetic blowing.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to a static contact arc extinguishing module for a high breaking capacity circuit breaker. Background Technology

[0002] Circuit breakers are critical protection devices in power distribution systems, and one of their core performance indicators is the ability to reliably interrupt and effectively extinguish electric arcs during short-circuit faults. The stationary contact arc-extinguishing system, as the part that generates and initially guides the electric arc, directly determines the breaking capacity and service life of the circuit breaker.

[0003] Currently, existing arc-extinguishing solutions for stationary contacts typically involve separately installing an arc-starting angle and a magnetizing plate beside the stationary contact. Firstly, the magnetic field strength and direction generated by the separate magnetizing plate are insufficient, resulting in inadequate magnetic blowing force, slow arc movement, and prolonged stagnation on the contact surface, exacerbating contact galvanic corrosion. Secondly, the assembly structure between the arc-starting angle, magnetizing plate, and stationary contact is complex, leading to poor connection reliability and fluctuating contact resistance. Thirdly, the arc-extinguishing chamber grid is usually fixed only by slots on the insulating cover, which are prone to loosening or shifting under the strong electrodynamic repulsion and airflow impact generated by interrupting large currents, affecting arc-extinguishing stability. Furthermore, the arc may be reflected or diverted by the metal component surface, posing a risk of reignition or phase-to-phase short circuit. Therefore, there is an urgent need in this field for a stationary contact arc-extinguishing solution that integrates efficient magnetic blowing, rapid arc ignition, a stable structure, and reliable insulation. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and provide a static contact arc extinguishing module for a high breaking capacity circuit breaker, so as to solve the problems of low magnetic blow-out efficiency, unreliable component connection, unstable arc extinguishing chamber and insufficient insulation protection in the existing technology.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A stationary contact arc-extinguishing module for a high breaking capacity circuit breaker includes a stationary contact, an arc-extinguishing chamber, and an integrally formed magnetizing component. An insulating cover is provided on the contact end of the stationary contact, and the arc-extinguishing chamber is disposed on the insulating cover. The insulating cover has an arc-extinguishing channel communicating with the arc-extinguishing chamber. A strip-shaped hole extending along the current direction is opened on the contact end of the stationary contact. The end of the strip-shaped hole is bent upward to form a cantilevered contact piece. The contact piece extends into the arc-extinguishing channel and is provided with a stationary contact point. A clamping space is formed between the contact piece and the contact end body. The magnetizing component includes a support portion fixed in the clamping space, two magnetizing pieces extending horizontally outward from both sides of the support portion and exposed outside the insulating cover, and an arc-inducing piece extending upward from the support portion. The two magnetizing pieces are distributed on both sides of the stationary contact, and the arc-inducing piece passes through the arc-extinguishing channel and extends into the arc-extinguishing chamber.

[0006] In some embodiments, the outer wall of the insulating cover is provided with a positioning structure, and a positioning space is formed between the positioning structure and the magnetizing sheet for inserting and fixing the arc-extinguishing plate of the arc-extinguishing chamber.

[0007] In some embodiments, the positioning structure is a recessed positioning groove, and the side of the magnetizing sheet is parallel to the side of the positioning groove.

[0008] In some embodiments, the support portion and the clamping space are secured by an interference fit.

[0009] In some embodiments, the insulating cover further includes an insulating partition extending upward from the contact end surface, the insulating partition partially intervening in the bottom of the arc extinguishing channel and the arc extinguishing chamber to block the arc from the base portion of the stationary contact.

[0010] In some embodiments, a cover is provided on the top of the arc-extinguishing chamber, and the inner wall of the cover is provided with a guide groove that connects the arc-extinguishing channel and the interior of the arc-extinguishing chamber.

[0011] In some embodiments, the cover is provided with a snap-fit ​​groove that mates with the arc-extinguishing plate of the arc-extinguishing chamber, and the cover is snapped onto the arc-extinguishing plate through the snap-fit ​​groove.

[0012] In some embodiments, the end of the arc-initiating plate extends into the arc-extinguishing groove of the arc-extinguishing grid plate in the arc-extinguishing chamber.

[0013] In some embodiments, a clamping groove is formed between the support portion and the two magnetizing sheets, and a limiting groove that engages with the clamping groove is provided at the bottom of the insulating cover.

[0014] In some embodiments, the contact piece is integrally formed by stamping and bending the stationary contact material at the end of the strip hole.

[0015] The beneficial effects of this utility model are as follows: The magnetizing component adopts an integrated molding structure design, integrating the support part, magnetizing plate, and arc-initiating plate into a single component, resulting in a compact structure and optimized magnetic field path. At the moment of breaking, the two magnetizing plates effectively enhance the magnetic field strength around the stationary contact area, using electromagnetic force to drive the arc to move rapidly towards the arc-extinguishing chamber. The arc-initiating plate directly passes through the arc-extinguishing channel and extends into the arc-extinguishing chamber, providing a clear and low-resistance path for the arc's movement. This rapidly pulls the arc into the arc-extinguishing chamber, greatly shortening the arc dwell time, thereby effectively suppressing arc erosion of the contacts and significantly improving the circuit breaker's breaking capacity and current-limiting performance. The magnetizing component is secured within the clamping space formed by the contact plate of the stationary contact and the body through its support part, achieving a screwless mechanical connection, simplifying the assembly process, ensuring a firm connection, and avoiding performance degradation due to loosening. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 This is a cross-sectional view of an embodiment of the present utility model; Figure 3 This invention relates to the assembly of the stationary contact and the magnetizing component in an embodiment of the present invention. Figure 4 This is a perspective view of the insulating cover according to an embodiment of the present utility model. Detailed Implementation

[0018] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figure 1-4As shown, a stationary contact arc-extinguishing module for a high breaking capacity circuit breaker includes a stationary contact 1, an arc-extinguishing chamber 2, and an integrally formed magnetizing component 3. An insulating cover 4 is provided on the contact end 11 of the stationary contact 1, and the arc-extinguishing chamber 2 is disposed on the insulating cover 4. The insulating cover 4 has an arc-extinguishing channel 400 communicating with the arc-extinguishing chamber 2. The contact end 11 of the stationary contact 1 has a strip-shaped hole 12 extending along its current direction. The end of the strip-shaped hole 12 is bent upward to form a cantilevered contact piece 13, which extends to the arc-extinguishing channel. A stationary contact 131 is provided within the arc extinguishing channel 400. A clamping space 100 is formed between the contact piece 13 and the contact end 11. The magnetizing component 3 includes a support portion 31 fixed within the clamping space 100, two magnetizing pieces 32 extending horizontally outward from both sides of the support portion 31 and exposed outside the insulating cover 4, and an arc-inducing piece 33 extending upward from the support portion 31. The two magnetizing pieces 32 are distributed on both sides of the stationary contact 131, and the arc-inducing piece 33 passes through the arc extinguishing channel 400 and extends into the arc extinguishing chamber 2. The outer wall of the insulating cover 4 is provided with a positioning structure 41, and a positioning space is formed between the positioning structure 41 and the magnetizing pieces 32 for inserting and fixing the arc-blocking plate 21 of the arc extinguishing chamber 2. By providing a positioning structure on the outer wall of the insulating cover and forming a positioning space together with the magnetizing pieces, an accurate installation position is provided for the arc-blocking plate of the arc extinguishing chamber, ensuring the relative positional accuracy between the arc-blocking plate, the magnetizing component, and the stationary contact, simplifying the assembly process, and improving product consistency and quality. The positioning structure 41 is a recessed positioning groove, and the side of the magnetizing sheet 32 ​​is parallel to the side of the positioning groove. The recessed design of the positioning groove makes the insertion of the arc-extinguishing plate tighter and less prone to displacement. The parallelism between the side of the magnetizing sheet and the side of the positioning groove allows the magnetizing sheet, the insulating cover, and the arc-extinguishing plate to fit tightly together, resulting in a more compact structure and high space utilization. The support part 31 and the clamping space 100 are secured by an interference fit. The interference fit between the support part and the clamping space is simple and reliable, avoiding the use of additional fasteners such as screws and rivets, reducing costs and assembly complexity, while ensuring good conductivity. The insulating cover 4 also includes an insulating partition 42 extending upward from the surface of the contact end 11. The insulating partition 42 partially intervenes in the bottom of the arc-extinguishing channel 400 and the arc-extinguishing chamber 2 to block the arc from the base of the stationary contact 1. An insulating partition intervenes in the critical area of ​​arc combustion and movement, physically isolating the arc from the base of the stationary contact, preventing the arc from burning the stationary contact body or causing accidental phase-to-phase short circuits, thus improving the safety and service life of the circuit breaker. A cover 5 is installed on the top of the arc-extinguishing chamber 4, and the inner wall of the cover 5 has a guide groove 51 connecting the arc-extinguishing channel 400 to the interior of the arc-extinguishing chamber 2. The guide groove on the top of the cover provides a smooth and unobstructed transition channel for the arc to enter the interior of the arc-extinguishing chamber from the arc-extinguishing channel, facilitating the rapid rise and diffusion of the arc.

[0022] like Figure 1As shown, the cover 5 is provided with a snap-fit ​​groove 52 that mates with the arc-isolating plate 21 of the arc-extinguishing chamber 2. The cover 5 is snapped onto the arc-isolating plate 21 through the snap-fit ​​groove 52. The snap-fit ​​groove and the arc-isolating plate of the cover enable quick and reliable sealing of the top of the arc-extinguishing chamber.

[0023] like Figure 2 As shown, the end of the arc-starting plate 33 extends into the arc-extinguishing groove 221 of the arc-extinguishing grid plate 22 in the arc-extinguishing chamber 2. By extending the end of the arc-starting plate directly into the arc-extinguishing groove of the arc-extinguishing grid plate, the arc can be precisely guided to the area with the strongest arc-extinguishing capability, ensuring that the arc can be quickly divided, cooled and extinguished, thus improving the arc-extinguishing efficiency and breaking capability.

[0024] like Figure 3 and 4 As shown, a clamping groove 34 is formed between the support part 31 and the two magnetizing pieces 32, and a limiting groove 43 is provided at the bottom of the insulating cover 4, which engages with the clamping groove 34. The limiting groove at the bottom of the insulating cover and the clamping groove on the magnetizing piece engage with each other, forming a two-way mechanical interlock. This prevents the magnetizing piece from detaching from the insulating cover under electrodynamic or vibration conditions, ensuring the stability of the entire arc extinguishing module during long-term operation. The contact piece 13 is integrally formed from the material of the stationary contact 1 at the end of the strip hole by stamping and bending. The contact piece and the stationary contact body are integrally formed, avoiding problems such as increased contact resistance and insufficient mechanical strength that may be caused by welding or riveting.

[0025] The magnetizing component adopts a one-piece molded structure design, integrating the support, magnetizing plates, and arc-initiating plates into a single component, resulting in a compact structure and optimized magnetic field path. At the moment of disconnection, the two magnetizing plates effectively enhance the magnetic field strength around the stationary contact area, using electromagnetic force to drive the arc rapidly towards the arc-extinguishing chamber. The arc-initiating plate passes directly through the arc-extinguishing channel and extends into the arc-extinguishing chamber, providing a clear and low-resistance path for arc movement. This rapidly pulls the arc into the arc-extinguishing chamber, significantly shortening the arc dwell time and effectively suppressing arc erosion of the contacts, thus significantly improving the circuit breaker's breaking capacity and current-limiting performance. The magnetizing component is secured within the clamping space formed by the contact plates of the stationary contact and the body through its support, achieving a screwless mechanical connection. This simplifies the assembly process, ensures a firm connection, and avoids performance degradation due to loosening.

[0026] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. A static contact arc-extinguishing module for a high breaking capacity circuit breaker, characterized in that: The device includes a stationary contact, an arc-extinguishing chamber, and an integrally formed magnetizing component. An insulating cover is provided on the contact end of the stationary contact. The arc-extinguishing chamber is disposed on the insulating cover, which has an arc-extinguishing channel communicating with the arc-extinguishing chamber. A strip-shaped hole extending along the current direction is opened on the contact end of the stationary contact. The end of the strip-shaped hole is bent upwards to form a cantilevered contact piece. The contact piece extends into the arc-extinguishing channel and has a stationary contact point. A clamping space is formed between the contact piece and the contact end body. The magnetizing component includes a support portion secured within the clamping space, two magnetizing pieces extending horizontally outwards from both sides of the support portion and exposed outside the insulating cover, and an arc-inducing piece extending upwards from the support portion. The two magnetizing pieces are distributed on either side of the stationary contact, and the arc-inducing piece passes through the arc-extinguishing channel and extends into the arc-extinguishing chamber. The outer wall of the insulating cover is provided with a positioning structure, and a positioning space is formed between the positioning structure and the magnetizing sheet for inserting and fixing the arc-extinguishing plate of the arc-extinguishing chamber. The positioning structure is a positioning groove formed by a recess, and the side of the magnetizing sheet is parallel to the side of the positioning groove. The support and the clamping space are secured by an interference fit. The insulating cover also includes an insulating partition extending upward from the contact end surface. The insulating partition partially intervenes in the bottom of the arc extinguishing channel and the arc extinguishing chamber to block the electric arc from the base part of the stationary contact. The top of the arc-extinguishing chamber is provided with a cover, and the inner wall of the cover is provided with a guide groove that connects the arc-extinguishing channel and the interior of the arc-extinguishing chamber. The cover is provided with a snap-fit ​​groove that mates with the arc-extinguishing chamber's arc-blocking plate, and the cover is snapped onto the arc-blocking plate through the snap-fit ​​groove; The end of the arc-initiating plate extends into the arc-extinguishing groove of the arc-extinguishing grid plate in the arc-extinguishing chamber; A clamping groove is formed between the support part and the two magnetizing sheets, and a limiting groove that engages with the clamping groove is provided at the bottom of the insulating cover. The contact piece is integrally formed by stamping and bending the stationary contact material at the end of the strip hole.

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