CN217881382U

CN217881382U - Safety circuit breaker

Info

Publication number: CN217881382U
Application number: CN202221605900.5U
Authority: CN
Inventors: 程庆丰; 张敏建
Original assignee: Zhejiang Diman Electric Co ltd
Current assignee: Zhejiang Diman Electric Co ltd
Priority date: 2022-06-25
Filing date: 2022-06-25
Publication date: 2022-11-22
Anticipated expiration: 2032-06-25

Abstract

The application relates to a safety circuit breaker, which relates to the technical field of circuit breakers and comprises a shell, and an operating mechanism, a movable contact piece and a static contact piece which are arranged in the shell; the static contact piece is used for being electrically connected with an external circuit, the movable contact piece is arranged on the operating mechanism, and the operating mechanism is used for driving the movable contact piece and the static contact piece to realize switching-on or switching-off; an arc extinguishing cover used for covering the static contact piece and the movable contact piece is arranged in the shell, and the operating mechanism is arranged on the arc extinguishing cover in a sliding mode. This application has the influence that the electric arc that produces when having reduced movable contact and static contact or separation normally worked and bring to other elements of circuit breaker inside, has played the guard action to other elements of arc-extinguish chamber outside, has prolonged life's effect.

Description

Safety circuit breaker

Technical Field

The application relates to the field of circuit breakers, in particular to a safety circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. In the related art, there is a circuit breaker, which includes a housing, and a release, an operating mechanism, a movable contact and a static contact, which are disposed in the housing; the operating mechanism is used for driving the movable contact piece to move towards the direction close to or far away from the static contact piece; when the movable contact piece is contacted with the static contact piece, the switching-on is realized, the external circuit is switched on, and when the movable contact piece is separated from the static contact piece, the switching-off is realized, and the external circuit is disconnected; the tripper is movably connected with the operating mechanism and used for driving the operating mechanism to act when an external circuit is abnormal so as to realize the separation of the movable contact piece and the static contact piece.

To above-mentioned circuit breaker, the applicant has found that when the circuit breaker breaks off or closes, the movable contact and the static contact of circuit breaker can produce electric arc in a closed or a separated moment, and when the electric arc that produces was great, can bring the influence to the normal work of other important components inside the circuit breaker, even still probably lead to the circuit breaker to take place to damage.

SUMMERY OF THE UTILITY MODEL

In order to reduce the influence that the electric arc that produces when breaking or closing normally work and bring to other inside components of circuit breaker, this application provides a safe type circuit breaker.

The application provides a safe type circuit breaker adopts following technical scheme:

a safety circuit breaker comprises a shell, an operating mechanism, a movable contact piece and a static contact piece, wherein the operating mechanism, the movable contact piece and the static contact piece are arranged in the shell; the static contact piece is used for being electrically connected with an external circuit, the movable contact piece is arranged on the operating mechanism, and the operating mechanism is used for driving the movable contact piece and the static contact piece to realize switching-on or switching-off; an arc extinguishing cover used for covering the static contact piece and the movable contact piece is arranged in the shell, and the operating mechanism is arranged on the arc extinguishing cover in a sliding mode.

By adopting the technical scheme, when the operating mechanism drives the movable contact piece and the static contact piece to realize switching on or switching off, the movable contact piece and the static contact piece are covered by the arc-extinguishing cover, so that the outward diffusion of electric arcs can be effectively inhibited, and the electric arcs are limited in the arc-extinguishing cover; therefore, the influence of electric arcs generated when the movable contact piece and the static contact piece are contacted or separated on the normal work of other elements inside the circuit breaker is reduced, the other elements outside the arc extinguishing cover are protected, and the service life is prolonged.

Optionally, a clamping seat is arranged on the inner side wall of the shell, a buckle is arranged on the side wall of the clamping seat, an opening for inserting the operating mechanism, the movable contact piece and the static contact piece is formed in one side of the arc extinguishing cover, and a clamping groove for clamping and matching with the buckle is formed in the arc extinguishing cover.

By adopting the technical scheme, when the arc-extinguishing cover is installed, the buckle on the clamping seat is clamped and matched with the clamping groove on the arc-extinguishing cover, so that the arc-extinguishing cover can be smoothly installed on the clamping seat; when the movable contact piece or the static contact piece needs to be maintained and checked, the arc extinguishing cover can be detached by removing the locking between the buckle and the clamping groove, so that the movable contact piece and the static contact piece can be conveniently maintained by workers.

Optionally, a sealing ring is arranged on the side wall where the opening surface of the arc-extinguishing chamber is located, and the sealing ring is attached to the inner wall of the shell.

Through adopting above-mentioned technical scheme, when installing the arc-extinguishing cover on the joint seat, the sealing washer will laminate each other with the inner wall of casing, through the laminating each other of sealing washer and casing, has improved the sealed effect of arc-extinguishing cover, and the electric arc that makes the production is difficult for spreading from the clearance between arc-extinguishing cover and the shells inner wall.

Optionally, a plurality of arc extinguishing grid pieces are arranged on the arc extinguishing cover; the arc extinguishing grid pieces are arranged at intervals in sequence.

By adopting the technical scheme, when the movable contact piece and the static contact piece generate electric arcs in a contact or separation moment, the electric arcs are drawn into the arc extinguishing grid pieces under the action of the contractile force of the magnetic force lines, one long arc is divided into a plurality of sections of short arcs by the arc extinguishing grid pieces, and when the alternating current passes through zero, all the short arcs are extinguished, so that the arc extinguishing efficiency is improved.

Optionally, the operating mechanism includes a sliding frame slidably disposed in the housing, the sliding frame is provided with a through insertion hole, and the movable contact is movably disposed on the insertion hole in a penetrating manner; the sliding frame is provided with a first spring used for pressing the movable contact piece on the inner side wall of the jack, and the first spring stretches and retracts in the direction perpendicular to the direction in which the movable contact piece is inserted into the jack.

By adopting the technical scheme, when the movable contact piece in the circuit breaker needs to be replaced, a worker pushes the first spring towards the direction far away from one end of the movable contact piece, the fixing effect of the first spring on the movable contact piece is removed, and then the movable contact piece is pulled out from the jack penetrating through the sliding frame; then a new movable contact piece is put in, the thrust on the first spring is removed, the first spring is rebounded and tightly pressed on the movable contact piece, and the movable contact piece is fixed.

Optionally, a limiting column is arranged on the sliding frame, the limiting column is located at one end of the first spring, which is far away from the movable contact piece, and the end of the first spring is inserted into the limiting column.

Through adopting above-mentioned technical scheme, insert first spring one end on spacing post, can fix first spring spacing on the frame that slides through spacing post, can realize again simultaneously taking out first spring from the frame that slides.

Optionally, an insulating sheet is arranged on an end face, facing the movable contact piece, of the first spring, and the insulating sheet is used for being attached to the surface of the movable contact piece.

Through adopting above-mentioned technical scheme, external circuit is switched on after movable contact and static contact, can prevent the electric current through the insulating piece this moment and flow first spring to can play insulation protection's effect to first spring.

Optionally, a slide way is arranged on the shell, and the sliding frame is slidably arranged in the slide way; the outer side wall of the sliding frame is attached to the inner side wall of the slide way.

Through adopting above-mentioned technical scheme, the slide can play spacing effect to sliding of frame that slides to make sliding of frame that slides more stable.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the influence of electric arcs generated when the movable contact piece and the static contact piece are contacted or separated on the normal work of other elements in the circuit breaker is reduced;

2. the clamping seat is pulled to separate the buckle on the clamping seat from the clamping groove on the arc-extinguishing cover, so that the arc-extinguishing cover is disassembled, and the maintenance of the internal elements of the circuit breaker by workers is facilitated;

3. through setting up a plurality of bars piece for the long arc is cut apart into the short arc, has improved arc extinguishing efficiency.

Drawings

Fig. 1 is an exploded view of the structure of the embodiment of the present application.

Figure 2 is a partial structure schematic diagram after the arc extinguishing chamber is hidden.

Figure 3 is a partial schematic view of the arc chute.

Description of reference numerals: 1. a housing; 11. a clamping seat; 111. buckling; 12. a slideway; 2. an operating mechanism; 21. a sliding frame; 22. a second spring; 211. a jack; 212. a first spring; 2121. an insulating sheet; 213. a limiting column; 3. a movable contact spring; 4. a static contact piece; 5. an arc extinguishing chamber; 51. a card slot; 52. a seal ring; 53. and an arc extinguishing grid plate.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses safe type circuit breaker. Referring to fig. 1, the safety circuit breaker includes a housing 1, and an operating mechanism 2, a movable contact piece 3, a static contact piece 4 for electrically connecting with an external circuit, and an arc chute 5 disposed in the housing 1; the operating mechanism 2 is used for driving the movable contact piece 3 and the static contact piece 4 to realize switching-on or switching-off.

As shown in fig. 1 and 2, the static contact 4 is fixedly disposed on the housing 1, the operating mechanism 2 includes a sliding frame 21, and the moving contact 3 is disposed on the sliding frame 21. The movable contact piece 3 and the static contact piece 4 are arranged oppositely, the sliding frame 21 is arranged on the shell 1 in a sliding mode, and the sliding frame 21 is used for driving the movable contact piece 3 to move towards the direction close to or far away from the static contact piece 4. When the sliding frame 21 drives the movable contact piece 3 and the static contact piece 4 to contact with each other, the switch-on state is achieved. When the sliding frame 21 drives the movable contact piece 3 and the static contact piece 4 to separate from each other, the opening state is achieved.

As shown in fig. 2 and 3, a plurality of clamping seats 11 facing the static contact piece 4 and the moving contact piece 3 are integrally formed on the inner side wall of the housing 1, the clamping seats 11 have certain elasticity, and a plurality of clamping grooves 51 corresponding to the positions of the clamping seats 111 one by one are formed on the clamping seats 11, and the clamping grooves 51 are used for being clamped and matched with the corresponding clamping grooves 111. The arc-extinguishing chamber 5 is fixed in the housing 1 by the mutual clamping of the clamping groove 51 and the buckle 111. An opening for inserting the sliding frame 21, the movable contact piece 3 and the static contact piece 4 is formed in one side of the arc-extinguishing chamber 5, the static contact piece 4 and the movable contact piece 3 are covered by the arc-extinguishing chamber 5, the movable contact piece 3 is arranged in the arc-extinguishing chamber 5 in a sliding mode along with the sliding frame 21, and one end of the sliding frame 21 extends out of the arc-extinguishing chamber 5. A sealing ring 52 is fixedly arranged on the side wall of the opening surface of the arc-extinguishing chamber 5, and when the arc-extinguishing chamber 5 is fixedly arranged in the shell 1, the sealing ring 52 is attached to the inner wall of the shell 1.

As shown in fig. 1 and 2, an insertion hole 211 into which the movable contact piece 3 is inserted is formed through the slide frame 21, and the movable contact piece 3 is movably inserted into the insertion hole 211. The slide frame 21 is further provided with a first spring 212 which extends and contracts in a direction perpendicular to the insertion direction of the movable contact piece 3 into the insertion hole 211. The first spring 212 is used for pressing the movable contact piece 3 on the inner side wall of the insertion hole 211, the sliding frame 21 is further provided with a limiting column 213 for preventing the first spring 212 from being separated, and one end of the first spring 212, which is far away from the movable contact piece 3, is inserted into the limiting column 213. An insulation sheet 2121 is disposed on an end surface of the first spring 212 facing the movable contact piece 3, and the insulation sheet 2121 is attached to and pressed against the surface of the movable contact piece 3 under the elastic force of the first spring 212. When the movable contact piece 3 needs to be replaced or maintained, the first spring 212 is pushed to move away from the movable contact piece 3, the fixed state of the movable contact piece 3 by the first spring 212 is released, and the movable contact piece 3 can be put in or taken out through the jack 211.

As shown in fig. 2 and 3, the inner side wall of the housing 1 is integrally formed with a slide rail 12, the sliding frame 21 is slidably disposed in the slide rail 12, and the outer side wall of the sliding frame 21 is attached to the inner side wall of the slide rail 12. The operating mechanism 2 further comprises a second spring 22 located in the slide way 12, the second spring 22 is located outside the sliding frame 21, and the second spring 22 extends and retracts along the sliding direction of the sliding frame 21. One end of the second spring 22 is abutted against the inner wall of the slideway 12, the other end of the second spring 22 is abutted against the outer side wall of the sliding frame 21, and the second spring 22 is used for pushing the sliding frame 21 to slide towards the direction far away from the static contact piece 4.

As shown in fig. 2 and 3, a plurality of arc-extinguishing grid pieces 53 which are arranged at intervals in sequence are fixedly installed on the side wall of the arc-extinguishing cover 5 facing the movable contact piece 3 and the static contact piece 4, the electric arc is pulled into the arc-extinguishing grid pieces 53 under the action of the contraction force of the magnetic force line, a long arc is divided into a plurality of short arcs by the arc-extinguishing grid pieces 53, and when the alternating current passes through zero, all the short arcs are extinguished, so that the arc-extinguishing efficiency is improved.

The embodiment of the application provides an implementation principle of a safety circuit breaker as follows: through arc-extinguish chamber 5 with movable contact 3 and static contact 4 shroud, the electric arc that forms when realizing that movable contact 3 and static contact 4 remove or separate is in arc-extinguish chamber 5 by the shroud, is provided with the arc extinguishing bars piece 53 of arranging in proper order at intervals on the arc-extinguish chamber 5 simultaneously, realizes that the long arc is separated into a plurality of short arcs, and when the alternating current zero crossing, all short arcs extinguish to realize that electric arc extinguishes in arc-extinguish chamber 5. The embodiment of the application reduces the influence of the electric arc generated when the movable contact piece 3 and the static contact piece 4 are contacted or separated on the normal work of other elements in the breaker.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A safety circuit breaker comprises a shell (1), an operating mechanism (2), a movable contact piece (3) and a static contact piece (4) which are arranged in the shell (1); the static contact piece (4) is used for being electrically connected with an external circuit, the movable contact piece (3) is arranged on the operating mechanism (2), and the operating mechanism (2) is used for driving the movable contact piece (3) and the static contact piece (4) to realize switching on or switching off; the method is characterized in that: an arc extinguishing chamber (5) for covering the static contact piece (4) and the movable contact piece (3) is arranged in the shell (1), and the operating mechanism (2) is arranged on the arc extinguishing chamber (5) in a sliding mode.

2. The safety circuit breaker according to claim 1, wherein: be provided with joint seat (11) on casing (1) inside wall, be provided with buckle (111) on joint seat (11) lateral wall, arc-extinguishing chamber (5) one side is provided with and supplies operating device (2), movable contact (3) and static contact (4) male opening, be provided with on arc-extinguishing chamber (5) and be used for with buckle (111) joint complex draw-in groove (51).

3. The safety circuit breaker according to claim 2, characterized in that: and a sealing ring (52) is arranged on the side wall where the opening surface of the arc extinguishing chamber (5) is positioned, and the sealing ring (52) is attached to the inner wall of the shell (1).

4. The safety circuit breaker according to claim 1, wherein: a plurality of arc extinguishing grid pieces (53) are arranged on the arc extinguishing cover (5); the arc extinguishing grid pieces (53) are sequentially arranged at intervals.

5. The safety circuit breaker according to claim 1, wherein: the operating mechanism (2) comprises a sliding frame (21) which is arranged in the shell (1) in a sliding manner, a through jack (211) is arranged on the sliding frame (21), and the movable contact piece (3) is movably arranged on the jack (211) in a penetrating manner; the sliding frame (21) is provided with a first spring (212) used for pressing the movable contact piece (3) on the inner side wall of the insertion hole (211), and the first spring (212) stretches in the direction perpendicular to the insertion direction of the movable contact piece (3) into the insertion hole (211).

6. The safety circuit breaker according to claim 5, wherein: the sliding frame (21) is provided with a limiting column (213), the limiting column (213) is positioned at one end of the first spring (212) far away from the movable contact piece (3), and the end part of the first spring (212) is inserted into the limiting column (213).

7. The safety circuit breaker according to claim 5, characterized in that: an insulating sheet (2121) is arranged on the end face, facing the movable contact piece (3), of the first spring (212), and the insulating sheet (2121) is attached to the surface of the movable contact piece (3).

8. The safety circuit breaker according to claim 5, characterized in that: a slide way (12) is arranged on the shell (1), and the sliding frame (21) is arranged in the slide way (12) in a sliding manner; the outer side wall of the sliding frame (21) is attached to the inner side wall of the sliding way (12).