A circuit breaker that can shorten the overall arcing time

Abstract

This utility model relates to the field of circuit breaker technology and discloses a circuit breaker that can shorten the overall arcing time. It includes two housings, a fixed frame, and an arc-extinguishing grid. The outer walls on both sides of the fixed frame are fixedly connected to the housings. A contact piece is fixedly connected to the middle of the lower end of the fixed frame. An actuating mechanism is provided inside the housings. The actuating mechanism includes a sleeve, a shaft, a rack, and a moving block. The lower end of the sleeve is fixedly connected to the fixed frame, and a first return spring is fixedly connected to the upper end of the fixed frame. A top block is fixedly connected to the upper end of the first return spring. An induction coil is sleeved on the outer wall of the sleeve. In this utility model, a large current is passed through the induction coil in the actuating mechanism to generate a strong magnetic field, attracting the top block to move downwards. This pushes the moving block to cause the locking block to release from the locking groove on the rack. Two torsion springs drive the rack to rotate, and through the connecting rod, the conductive piece and the contact piece are quickly separated, thereby shortening the arcing time.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a circuit breaker that can shorten the overall arcing time. Background Technology

[0002] A circuit breaker is a key switching device used in power systems. Its core function is to close, carry, and interrupt current in a circuit under abnormal conditions, while also providing protection. It is widely used in power distribution, equipment protection, and circuit fault handling.

[0003] However, an electric arc will be generated when disconnecting under abnormal conditions, which will damage the equipment. Most of the existing circuit breakers on the market have a long arcing time, resulting in poor arc extinguishing ability and reduced protection of the circuit.

[0004] Therefore, those skilled in the art have provided a circuit breaker that can shorten the overall arcing time to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies and provide a circuit breaker that can shorten the overall arcing time. This is achieved by using an induction coil in the operating mechanism to generate a strong magnetic field after a large current passes through it. This magnetic field attracts the top block to move downwards, pushing the moving block to release the locking block from the slot on the gear plate. Two torsion springs then rotate the gear plate, and a connecting rod causes the conductive sheet and contact piece to separate quickly, thereby improving the arc-extinguishing capability of the circuit breaker.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A circuit breaker capable of shortening the overall arcing time includes two housings, a fixed frame, and an arc-extinguishing grid. The outer walls on both sides of the fixed frame are fixedly connected to the housings. A contact piece is fixedly connected to the middle of the lower end of the fixed frame. An actuating mechanism is provided inside the housing. The actuating mechanism includes a sleeve, a shaft, a rack, and a moving block. The lower end of the sleeve is fixedly connected to the fixed frame. A first return spring is fixedly connected to the upper end of the fixed frame. A top block is fixedly connected to the upper end of the first return spring.

[0008] An induction coil is fitted on the outer wall of the sleeve. The lower end of the induction coil passes through the fixed frame and is fixedly connected to the contact piece. Both sides of the shaft are rotatably connected to the housing. A gear plate is fixedly connected to the middle of the outer wall of the shaft. Torsion springs are fitted on both sides of the outer wall of the shaft. Connecting rods are hinged to the rear ends of the outer walls of both sides of the gear plate. A conductive plate is hinged to the upper end of the connecting rod. The upper end of the conductive plate is in contact with the contact piece. The bottom surface inside the housing is slidably connected to the rack.

[0009] The upper end of the rack is engaged with the gear plate. The outer wall of the front end of the gear plate is provided with a slot. The outer walls on both sides of the moving block are slidably connected to the inner walls on both sides of the fixed frame. A locking block is fixedly connected to the outer wall of the rear end of the moving block. The outer wall of the rear end of the locking block is engaged with the slot. A second return spring is fixedly connected to the outer wall of the front end of the moving block.

[0010] Through the above technical solution, the induction coil sleeved on the sleeve generates a strong magnetic field after passing an excessive current under abnormal conditions. This magnetic field attracts the top block to move rapidly downward, pushing the moving block to release the locking block from the slot on the gear plate. Two torsion springs release the elastic force, causing the gear plate to rotate. The connecting rod then causes the conductive sheet and contact sheet to separate quickly, creating a larger distance and making the arc easier to extinguish. Combined with the arc-extinguishing grid, the arc is divided into multiple parts, improving the arc-extinguishing capability of the circuit breaker.

[0011] Furthermore, a connecting screw is provided at an opening on one side of the outer wall of the housing, and the rear end of the connecting screw is threaded to the housing.

[0012] The above technical solution uses connecting screws installed at openings on one housing to firmly fix the two housings together, preventing them from separating.

[0013] Furthermore, the top block slides inside the sleeve, and the lower end of the top block passes through the fixed frame and fits against the upper end of the moving block;

[0014] Through the above technical solution, the induction coil generates a strong magnetic field after an abnormal current passes through it, attracting the top block to move inside the sleeve, so that the lower end of the top block can push the moving block, whose upper surface is inclined, to move on the inner wall of the fixed frame.

[0015] Furthermore, the side of the torsion spring closest to the center of the shaft is fixedly connected to the gear plate, and the side of the torsion spring furthest from the center of the shaft is fixedly connected to the fixed frame.

[0016] Through the above technical solution, two torsion springs sleeved on the shaft are fixedly connected to the gear disk and the fixed frame respectively, one close to the shaft and the other far away from the shaft. When the slot on the gear disk is engaged with the locking block, the torsion spring is in a state of stored force. Then, after the locking block is released from the locking state of the slot, the torsion spring releases its elastic force instantly, causing the gear disk to rotate rapidly.

[0017] Furthermore, the lower end of the conductive sheet is fixedly connected to the arc-extinguishing grid, the rear end of the arc-extinguishing grid is fixedly connected to the housing, and the front end of the lower end of the arc-extinguishing grid is fixedly connected to the contact piece.

[0018] Through the above technical solution, by fixing the lower end of the conductive sheet to the arc-extinguishing grid, when the conductive sheet is away from the contact piece, the arc can be introduced to the arc-extinguishing grid. The arc-extinguishing grid is composed of multiple metal sheets, which can divide the arc into multiple parts and decompose them one by one.

[0019] Furthermore, an indicator block is fixedly connected to the outer wall of the front end of the rack through the housing, and the front end of the second return spring is fixedly connected to the fixing frame;

[0020] Through the above technical solution, by fixing the indicator block at the front end of the rack, when the rack rotates and drives the rack to extend out of the housing, the indicator block can indicate the current switch status to the operator. When it extends, it is in the off state, and when it retracts, it is in the on state. The second reset spring acts on the moving block, so that the moving block can be locked in the slot opened on the rack by the locking block to prevent the rack from rotating.

[0021] Furthermore, the upper end of the induction coil is fixedly connected to the upper terminal, and the lower end of the arc-extinguishing grid is fixedly connected to the lower terminal via a wire. The outer walls on both sides of the upper and lower terminals are fixedly connected to the housing.

[0022] By using the above technical solution, the induction coil is fixedly connected to the upper terminal, and the arc-extinguishing grid is fixedly connected to the lower terminal, allowing external wires to be connected. In conjunction with the conductive sheet fixedly connected to the upper terminal of the arc-extinguishing grid and the contact piece fixedly connected to the lower end of the induction coil, a complete current flow path is formed, so that when the conductive sheet is pulled away from the contact piece by the connecting rod, the circuit is broken.

[0023] This utility model has the following beneficial effects:

[0024] This invention proposes a circuit breaker that can shorten the overall arcing time. When an excessive current passes through the induction coil on the sleeve in the operating mechanism under abnormal conditions, a strong magnetic field is generated, attracting the top block to move rapidly downwards. This pushes the moving block to release the locking block from the slot on the gear disc. Two torsion springs release the elastic force, causing the gear disc to rotate. Through the connecting rod, the conductive sheet and contact piece quickly separate, creating a larger distance that makes the arc easier to extinguish. Combined with the arc-extinguishing grid, the arc is divided into multiple parts, shortening the overall arcing time and thus improving the circuit breaker's arc-extinguishing capability and circuit protection capability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the main structure of a circuit breaker that can shorten the overall arcing time according to the present invention;

[0026] Figure 2 An exploded view of a circuit breaker that can shorten the overall arcing time according to this utility model;

[0027] Figure 3 A cross-sectional view of a circuit breaker that can shorten the overall arcing time proposed in this utility model;

[0028] Figure 4 This is a front sectional view of a circuit breaker that can shorten the overall arcing time according to the present invention;

[0029] Figure 5 for Figure 3 Enlarged view of point A in the middle

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Housing; 2. Connecting screw; 3. Fixing frame; 4. Contact piece; 5. Actuating mechanism; 501. Sleeve; 502. Induction coil; 503. First return spring; 504. Top block; 505. Shaft; 506. Gear plate; 507. Torsion spring; 508. Connecting rod; 509. Conductive sheet; 510. Rack; 511. Indicator block; 512. Slot; 513. Moving block; 514. Locking block; 515. Second return spring; 6. Arc extinguishing grid; 7. Upper terminal; 8. Lower terminal. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Reference Figure 1-5 This utility model provides a specific implementation method:

[0034] A circuit breaker capable of shortening the overall arcing time includes two housings 1, a fixed frame 3, and an arc-extinguishing grid 6. The outer walls on both sides of the fixed frame 3 are fixedly connected to the housing 1. A contact piece 4 is fixedly connected to the middle of the lower end of the fixed frame 3. An actuating mechanism 5 is provided inside the housing 1. The actuating mechanism 5 includes a sleeve 501, a shaft 505, a rack 510, and a moving block 513. The lower end of the sleeve 501 is fixedly connected to the fixed frame 3. A first return spring 503 is fixedly connected to the upper end of the fixed frame 3. A top block 504 is fixedly connected to the upper end of the first return spring 503.

[0035] An induction coil 502 is fitted on the outer wall of the sleeve 501. The lower end of the induction coil 502 passes through the fixed frame 3 and is fixedly connected to the contact piece 4. Both sides of the shaft 505 are rotatably connected to the housing 1. A gear 506 is fixedly connected to the middle of the outer wall of the shaft 505. Torsion springs 507 are fitted on both sides of the outer wall of the shaft 505. Connecting rods 508 are hinged to the rear ends of the outer walls of both sides of the gear 506. Conductive pieces 509 are hinged to the upper ends of the connecting rods 508. The upper ends of the conductive pieces 509 are in contact with the contact piece 4. The bottom surface inside the housing 1 is slidably connected to the rack 510.

[0036] The upper end of the rack 510 is engaged with the gear disk 506. The outer wall of the front end of the gear disk 506 is provided with a slot 512. The outer walls on both sides of the moving block 513 are slidably connected to the inner walls on both sides of the fixed frame 3. The outer wall of the rear end of the moving block 513 is fixedly connected with a locking block 514. The outer wall of the rear end of the locking block 514 is engaged with the slot 512. The outer wall of the front end of the moving block 513 is fixedly connected with a second return spring 515.

[0037] When an excessive current passes through the sleeve 501 in the action mechanism 5 under abnormal conditions, the induction coil 502 generates a strong magnetic field, attracting the top block 504 to move rapidly downward. This pushes the moving block 513 to cause the locking block 514 to release the locking state of the locking slot 512 on the gear disc 506. The two torsion springs 507 release the elastic force, causing the gear disc 506 to rotate. Through the connecting rod 508, the conductive sheet 509 is quickly separated from the contact piece 4, creating a larger distance and making the arc easier to extinguish. In conjunction with the arc-extinguishing grid 6, the arc is divided into multiple parts, shortening the overall arcing time and thus improving the arc-extinguishing capability and circuit protection capability of the circuit breaker.

[0038] A connecting screw 2 is provided at an opening on one side of the outer wall of a housing 1. The rear end of the connecting screw 2 is threaded to the housing 1. The connecting screw 2 at the opening on the housing 1 can be used to firmly fix the two housings 1 together and prevent them from separating. The top block 504 slides inside the sleeve 501. The lower end of the top block 504 passes through the fixed frame 3 and is attached to the upper end of the moving block 513. After the induction coil 502 passes an abnormal current, it generates a strong magnetic field that attracts the top block 504 to move inside the sleeve 501. This allows the lower end of the top block 504 to push the moving block 513, whose upper surface is inclined, to move on the inner wall of the fixed frame 3. The torsion spring 507 is located near the center of the shaft 505. One side of each is fixedly connected to the gear disk 506, and the side of the torsion spring 507 away from the center of the shaft 505 is fixedly connected to the fixed frame 3. By fixing the two torsion springs 507 sleeved on the shaft 505 to the gear disk 506 and the fixed frame 3 respectively, when the slot 512 on the gear disk 506 is engaged with the block 514, the torsion spring 507 is in a stored state. Then, after the block 514 releases its engagement with the slot 512, the torsion spring 507 releases its elastic force instantly, causing the gear disk 506 to rotate rapidly. The lower end of the conductive sheet 509 is fixedly connected to the arc-extinguishing grid 6. The rear end of the arc-extinguishing grid 6 is fixedly connected to the housing 1. The front end of the lower end of the arc-extinguishing grid 6 is fixedly connected to the contact piece 4. By fixing the lower end of the conductive sheet 509 to the arc-extinguishing grid 6, the torsion spring 507 is fixedly connected to the contact piece 4. The arc-extinguishing grid 6 is fixedly connected, so that when the conductive plate 509 is away from the contact plate 4, the arc can be introduced to the arc-extinguishing grid 6. The arc-extinguishing grid 6 is composed of multiple metal plates, which can divide the arc into multiple parts and decompose them one by one. The outer wall of the front end of the rack 510 penetrates the housing 1 and is fixedly connected to the indicator block 511. The front end of the second return spring 515 is fixedly connected to the fixed frame 3. Through the indicator block 511 fixedly connected to the front end of the rack 510, when the rack 506 rotates and drives the rack 510 to extend out of the housing 1, the indicator block 511 can indicate the current switch status to the operator. When it extends, it is in the off state, and when it retracts, it is in the on state. The second return spring 515 acts on the moving block 513, so that the moving block 513 can use the locking block 51 4. The toothed disc 506 is engaged with the slot 512 on the toothed disc 506 to prevent the toothed disc 506 from rotating. The upper end of the induction coil 502 is fixedly connected to the upper terminal 7. The lower end of the arc-extinguishing grid 6 is fixedly connected to the lower terminal 8 through a wire. The outer walls on both sides of the upper terminal 7 and the lower terminal 8 are fixedly connected to the housing 1. By fixing the induction coil 502 to the upper terminal 7 and the arc-extinguishing grid 6 to the lower terminal 8, external wires can be connected. The conductive sheet 509 fixedly connected to the arc-extinguishing grid 6 is in contact with the contact piece 4 fixedly connected to the lower end of the induction coil 502, thereby forming a complete current flow path. When the conductive sheet 509 is pulled away from the contact piece 4 by the connecting rod 508, the circuit will be disconnected.

[0039] Working Principle: When using this circuit breaker that shortens the overall arcing time, the operator first inserts the external wires into the openings at the upper and lower ends of the housing 1 and secures them using the screws on the upper terminal 7 and lower terminal 8. Then, the current flows in the order of upper terminal 7, induction coil 502, contact piece 4, conductive piece 509, arc-extinguishing grid 6, and lower terminal 8. Secondly, in an abnormal state, excessive current causes the induction coil 502 to generate a strong magnetic field, attracting the top block 504 to overcome the first reset spring 503 and move downwards, pushing the moving block 513 to overcome the second reset spring 515, causing the locking block 514 to release from the locking state of the slot 512. Under the action of the torsion spring 507, the gear disc 506 rotates, using the connecting rod 508 to quickly separate the conductive piece 509 from the contact piece 4, pulling open... The greater distance makes the arc easier to extinguish. Combined with the arc-extinguishing grid 6, the arc is divided into multiple parts and extinguished. At the same time, the gear disk 506 causes the rack 510 to move the indicator block 511. Finally, due to the separation of the conductive sheet 509 from the contact piece 4, the power is cut off, and the strong magnetic field generated by the induction coil 502 disappears. Under the action of the first reset spring 503, the top block 504 returns to its original position. Then, the operator can use the indicator block 511 to push the rack 510 back into the housing 1 and drive the gear disk 506 to rotate. At the same time, the torsion spring 507 is charged. Then, under the action of the second reset spring 515, the moving block 513 drives the locking block 514 to return to the locking state of the locking slot 512, fixing the position of the gear disk 506. At this time, the connecting rod 508 pushes the conductive sheet 509 to return to contact with the contact piece 4, and the circuit is connected.

[0040] The following points should be noted in this article:

[0041] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0042] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A circuit breaker capable of shortening the overall arcing time, comprising two housings (1), a fixed frame (3), and an arc-extinguishing grid (6), characterized in that: The outer walls on both sides of the fixed frame (3) are fixedly connected to the housing (1). A contact piece (4) is fixedly connected to the middle of the lower end of the fixed frame (3). An action mechanism (5) is provided inside the housing (1). The action mechanism (5) includes a sleeve (501), a shaft (505), a rack (510), and a moving block (513). The lower end of the sleeve (501) is fixedly connected to the fixed frame (3). A first return spring (503) is fixedly connected to the upper end of the fixed frame (3). A top block (504) is fixedly connected to the upper end of the first return spring (503). The outer wall of the sleeve (501) is fitted with an induction coil (502). The lower end of the induction coil (502) passes through the fixed frame (3) and is fixedly connected to the contact piece (4). Both sides of the shaft (505) are rotatably connected to the housing (1). A gear plate (506) is fixedly connected to the middle of the outer wall of the shaft (505). Both sides of the outer wall of the shaft (505) are fitted with torsion springs (507). The rear ends of both sides of the outer wall of the gear plate (506) are hinged to connecting rods (508). The upper ends of the connecting rods (508) are hinged to conductive pieces (509). The upper end of the conductive pieces (509) is in contact with the contact piece (4). The bottom surface inside the housing (1) is slidably connected to the rack (510). The upper end of the rack (510) is engaged with the gear disc (506). The outer wall of the front end of the gear disc (506) is provided with a slot (512). The outer walls on both sides of the moving block (513) are slidably connected to the inner walls on both sides of the fixed frame (3). The outer wall at the rear end of the moving block (513) is fixedly connected with a locking block (514). The outer wall at the rear end of the locking block (514) is engaged with the slot (512). The outer wall at the front end of the moving block (513) is fixedly connected with a second return spring (515).

2. The circuit breaker capable of shortening the overall arcing time according to claim 1, characterized in that: A connecting screw (2) is provided at an opening on one side of the outer wall of the housing (1), and the rear end of the connecting screw (2) is threaded to the housing (1).

3. A circuit breaker capable of shortening the overall arcing time according to claim 1, characterized in that: The top block (504) slides inside the sleeve (501), and the lower end of the top block (504) passes through the fixed frame (3) and fits against the upper end of the moving block (513).

4. A circuit breaker capable of shortening the overall arcing time according to claim 1, characterized in that: The side of the torsion spring (507) near the center of the shaft (505) is fixedly connected to the gear plate (506), and the side of the torsion spring (507) away from the center of the shaft (505) is fixedly connected to the fixed frame (3).

5. A circuit breaker capable of shortening the overall arcing time according to claim 1, characterized in that: The lower end of the conductive sheet (509) is fixedly connected to the arc-extinguishing grid (6), the rear end of the arc-extinguishing grid (6) is fixedly connected to the housing (1), and the front end of the lower end of the arc-extinguishing grid (6) is fixedly connected to the contact piece (4).

6. A circuit breaker capable of shortening the overall arcing time according to claim 1, characterized in that: The outer wall of the front end of the rack (510) penetrates the housing (1) and is fixedly connected to the indicator block (511). The front end of the second reset spring (515) is fixedly connected to the fixed frame (3).

7. A circuit breaker capable of shortening the overall arcing time according to claim 1, characterized in that: The upper end of the induction coil (502) is fixedly connected to the upper terminal (7), and the lower end of the arc-extinguishing grid (6) is fixedly connected to the lower terminal (8) by a wire. The outer walls on both sides of the upper terminal (7) and the lower terminal (8) are fixedly connected to the housing (1).

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