A circuit breaker with built-in arc suppression structure

Abstract

This utility model relates to the field of circuit breaker technology, specifically to a built-in arc-suppression structure for a circuit breaker. The structure includes a circuit breaker with a mounting plate. A grid plate is located inside the circuit breaker, and an insulating rubber sheet is embedded in the mounting plate. Multiple sets of equidistantly distributed adjusting brackets are slidably mounted within the mounting plate. Each set of adjusting brackets is fixedly bonded to the insulating rubber sheet, and the adjusting brackets correspond to the grid plates. An adjusting mechanism is provided within the mounting plate, and the adjusting brackets have quick-connect mechanisms for fixing the grid plates. The adjusting mechanism includes a mounting bracket fixedly installed within the mounting plate. By incorporating a dynamically adjustable arc-suppression grid plate structure inside the circuit breaker, an intelligent arc-suppression function that adapts to different fault current levels is achieved. The quick-connect mechanism enables rapid replacement of the grid plates, solving the problem of traditional circuit breakers requiring complete replacement and significantly reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a built-in arc suppression structure for a circuit breaker. Background Technology

[0002] In power systems, circuit breakers, as critical protective devices, directly affect the safe and stable operation of the entire power grid due to their breaking capacity and reliability. With the continuous expansion of modern power systems, the increasing grid capacity, and the significant rise in short-circuit current levels, coupled with the complex operating conditions brought about by the large-scale grid connection of new energy power generation, higher demands are placed on the performance of circuit breakers. When breaking large currents, traditional circuit breakers experience a sharp increase in arc energy, which can lead to severe contact erosion. Arc-extinguishing structures, by rapidly extinguishing the arc and reducing arc energy release, can effectively prevent damage to circuit breaker contacts and surrounding components caused by high temperatures and electric shock, and prevent localized thermal damage or aging of insulation materials.

[0003] In traditional circuit breaker designs, the arc-extinguishing structure is typically highly integrated with the contact system. This means that if the arc-extinguishing grid or air-blowing device fails, the entire circuit breaker must be replaced, resulting in high maintenance costs and significant resource waste. Furthermore, existing arc-extinguishing grids usually employ a static grid structure with fixed spacing. While this design is simple and reliable, it has significant limitations when dealing with different current levels. Under high current conditions, a fixed spacing can lead to excessive concentration of arc energy, causing severe grid erosion; under low current conditions, an excessively large spacing reduces the near-electrode effect, affecting arc-extinguishing efficiency. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a circuit breaker with a built-in arc suppression structure, which solves the problems mentioned in the background.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a circuit breaker with built-in arc suppression structure, including a circuit breaker, a mounting plate on the circuit breaker, a grid plate inside the circuit breaker, an insulating rubber sheet embedded in the mounting plate, multiple sets of equidistantly distributed adjustment frames slidingly installed inside the mounting plate, the multiple sets of adjustment frames being fixedly bonded to the insulating rubber sheet, the multiple sets of adjustment frames being correspondingly arranged with the grid plate, an adjustment mechanism inside the mounting plate, and a quick-connect mechanism for fixing and installing the grid plate on the adjustment frame;

[0008] The adjustment mechanism includes a mounting frame fixedly installed inside the mounting plate. Two sets of symmetrically distributed guide rails are slidably mounted on the mounting frame. Two sets of slides are slidably mounted on the mounting frame, and the two sets of slides are fixedly connected to the two sets of guide rails respectively. A first rack is fixedly mounted on each set of slides. A first gear is provided between the two sets of first racks. The first gear is meshed with the two sets of first racks respectively. The first gear is rotatably connected to the mounting frame through a mounting shaft. The two sets of slides are centrally symmetrically distributed about the mounting shaft. A first torsion spring is sleeved on the mounting shaft. The two ends of the first torsion spring are fixedly connected to the first gear and the mounting frame respectively. A metal block is fixedly mounted on the outer slide. A solenoid corresponding to the metal block is fixedly mounted inside the mounting frame. A power supply device is fixedly mounted inside the mounting frame, and the solenoid is electrically connected to the positive and negative poles of the power supply device.

[0009] Preferably, a first slide rod corresponding to the slide is fixedly installed inside the mounting frame. The slide is slidably connected to the corresponding first slide rod. Two sets of symmetrically distributed first springs are sleeved on the first slide rod, and the two ends of the two sets of first springs are fixedly connected to the slide and the mounting frame, respectively. Two sets of adjustment frames on the outer side are fixedly connected to the corresponding guide rails, and multiple sets of adjustment frames on the inner side are slidably connected to the mounting frame and the guide rails, respectively.

[0010] Preferably, two sets of first connecting frames and two sets of second connecting frames are provided between two adjacent sets of adjustment frames. The upper ends of the two sets of first connecting frames are rotatably connected by a rotating shaft. The lower ends of the two sets of first connecting frames are rotatably mounted with sliders, and the sliders are slidably connected to the corresponding adjustment frames. The lower ends of the two sets of second connecting frames are rotatably connected by a rotating shaft, and the upper ends of the two sets of second connecting frames are rotatably connected to the corresponding adjustment frames by a rotating shaft.

[0011] Preferably, the quick-connect mechanism includes two sets of card holders slidably installed in the adjusting frame. Each set of card holders is fixedly equipped with a card rod, and the two sets of card rods are respectively movably engaged with corresponding grid plates. Each set of card holders is fixedly equipped with a second rack, and a second gear is provided between the two sets of second racks. The second gear is meshed with the two sets of second racks respectively. The second gear is rotatably connected to the adjusting frame through a rotating rod. A handle is rotatably installed on the adjusting frame, and a second sliding rod corresponding to the card holder is fixedly installed inside the adjusting frame.

[0012] Preferably, the two sets of card holders are centrally symmetrical about the rotating rod, and a second torsion spring is sleeved on the rotating rod, with the two ends of the second torsion spring being fixedly connected to the second gear and the adjusting frame, respectively.

[0013] Preferably, the handle and the rotating rod are vertically distributed, a first bevel gear is sleeved on the handle, and a second bevel gear is sleeved on the rotating rod, with the first bevel gear and the second bevel gear meshing together.

[0014] Preferably, the card holder is slidably sleeved with the corresponding second slide rod, and two sets of symmetrically distributed second springs are sleeved on the second slide rod, with the two ends of the two sets of second springs respectively fixedly connected to the corresponding card holder and the adjustment frame.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a circuit breaker with a built-in arc suppression structure, which has the following beneficial effects:

[0017] By incorporating an arc-extinguishing grid structure with dynamically adjustable spacing inside the circuit breaker, an intelligent arc-extinguishing function that adapts to different fault current levels is achieved. Under normal conditions, the solenoid is energized and attracts a metal block to maintain the grid spacing at its maximum, reducing the initial energy of the arc. After the fault current triggers the power supply to disconnect, the linkage mechanism synchronously contracts the spacing of all grids under the energy storage of the first spring and the first torsion spring, as well as the transmission of the connecting rod. This avoids concentrated arc erosion under high current and improves the near-electrode effect arc extinguishing efficiency under low current. This structure modularizes the arc extinguishing system and enables rapid grid replacement through a quick-connect mechanism, solving the pain point of traditional circuit breakers requiring complete replacement and significantly reducing maintenance costs. At the same time, the dynamic adjustment characteristics allow a single circuit breaker to cover a wider current protection range, improving the equipment's economy and environmental adaptability. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of a partially disassembled structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the adjustment mechanism of this utility model;

[0022] Figure 4 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the diagram;

[0023] Figure 5 This is a structural schematic diagram of the quick-connect mechanism of this utility model;

[0024] Figure 6 This utility model Figure 5 Enlarged schematic diagram of the structure at point B in the diagram.

[0025] In the diagram: 1. Circuit breaker; 2. Mounting plate; 3. Grid plate; 4. Insulating rubber sheet; 5. Adjusting frame; 6. Adjusting mechanism; 601. Mounting frame; 602. Guide rail; 603. First connecting frame; 604. Second connecting frame; 605. Slider; 606. Slide carriage; 607. First rack; 608. First gear; 609. Mounting shaft; 610. First torsion spring; 611. First slide rod; 612. First spring; 613. Metal block; 614. Solenoid; 615. Power supply device; 7. Quick-connect mechanism; 701. Card holder; 702. Card rod; 703. Second rack; 704. Second gear; 705. Rotating rod; 706. Second torsion spring; 707. Handle; 708. First bevel gear; 709. Second bevel gear; 710. Second slide rod; 711. Second spring. Detailed Implementation

[0026] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0027] Figures 1-6In one embodiment of this utility model, a circuit breaker 1 with a built-in arc-suppression structure includes a circuit breaker 1, a mounting plate 2 on the circuit breaker 1, a grid plate 3 inside the circuit breaker 1, an insulating rubber sheet 4 embedded in the mounting plate 2, and multiple sets of equidistantly distributed adjusting frames 5 slidably mounted inside the mounting plate 2. Each set of adjusting frames 5 is fixedly bonded to the insulating rubber sheet 4, and the multiple sets of adjusting frames 5 are correspondingly arranged with the grid plate 3. An adjusting mechanism 6 is provided inside the mounting plate 2, and a quick-connect mechanism 7 for fixing the grid plate 3 is provided on the adjusting frame 5. The adjusting mechanism 6 includes a mounting bracket 601 fixedly mounted inside the mounting plate 2, on which a sliding mounting bracket 601 is mounted. There are two sets of symmetrically distributed guide rails 602. Two sets of slides 606 are slidably mounted on the mounting bracket 601. The two sets of slides 606 are fixedly connected to the two sets of guide rails 602 respectively. A first rack 607 is fixedly mounted on each set of slides 606. A first gear 608 is provided between the two sets of first racks 607. The first gear 608 meshes with the two sets of first racks 607 respectively. The first gear 608 is rotatably connected to the mounting bracket 601 through a mounting shaft 609. The two sets of slides 606 are centrally symmetrically distributed about the mounting shaft 609. A first torsion spring 610 is sleeved on the mounting shaft 609. Both ends are fixedly connected to the first gear 608 and the mounting bracket 601, respectively. A metal block 613 is fixedly installed on the outer slide 606. A solenoid 614 corresponding to the metal block 613 is fixedly installed inside the mounting bracket 601. A power supply device 615 is fixedly installed inside the mounting bracket 601, and the positive and negative poles of the solenoid 614 and the power supply device 615 are electrically connected. By setting an arc-extinguishing grid 3 structure with dynamically adjustable spacing inside the circuit breaker 1, an intelligent arc-extinguishing function that adapts to different fault current levels is realized. Under normal conditions, the solenoid 614 is energized and attracts the metal block 613, keeping the grid 3 at its maximum spacing. The large spacing reduces the initial energy of the arc. After the fault current triggers the power supply to be cut off, the linkage mechanism synchronously shrinks the spacing of all grid plates 3 under the energy storage of the first spring 612 and the first torsion spring 610 and the action of the connecting rod. This avoids the concentrated burning of the arc under high current and improves the arc extinguishing efficiency of the near-electrode effect under low current. The structure modularizes the arc extinguishing system and realizes the quick replacement of grid plates 3 through the quick-connect mechanism 7. This solves the pain point that the traditional circuit breaker 1 must be replaced as a whole, significantly reducing maintenance costs. At the same time, the dynamic adjustment characteristics enable a single circuit breaker 1 to cover a wider current protection range, improving the economy and environmental adaptability of the equipment.

[0028] In this embodiment, reference Figure 3 , Figure 4As shown, a first slide rod 611 corresponding to the slide 606 is fixedly installed inside the mounting bracket 601. The slide 606 is slidably sleeved with the corresponding first slide rod 611. Two sets of symmetrically distributed first springs 612 are sleeved on the first slide rod 611, and the two ends of the two sets of first springs 612 are fixedly connected to the slide 606 and the mounting bracket 601, respectively. Two sets of outer adjustment brackets 5 are fixedly connected to the corresponding guide rails 602, and multiple sets of inner adjustment brackets 5 are slidably connected to the mounting bracket 601 and the guide rails 602, respectively. A space is provided between adjacent sets of adjustment brackets 5. Two sets of interleaved first connecting frames 603 and two sets of interleaved second connecting frames 604 are provided. The upper ends of the two sets of first connecting frames 603 are rotatably connected by a rotating shaft, and the lower ends of the two sets of first connecting frames 603 are rotatably mounted with sliders 605, which are slidably connected to the corresponding adjusting frames 5. The lower ends of the two sets of second connecting frames 604 are rotatably connected by a rotating shaft, and the upper ends of the two sets of second connecting frames 604 are rotatably connected to the corresponding adjusting frames 5 by rotating shafts. Under normal energized conditions, the power supply device 615 continuously supplies power to the solenoid 614, generating electromagnetic force. The metal block 613 is adsorbed, causing the slide 606 to move the guide rail 602 outward. At this time, the first torsion spring 610 is in an energy storage state, the first connecting frame 603 and the second connecting frame 604 are extended to their maximum angle, and all adjusting frames 5 maintain their maximum spacing under the action of the linkage mechanism. The three sets of grid plates form a wider arc-extinguishing channel to accommodate normal current. When the system detects a fault current, the power supply device 615 immediately cuts off the power supply to the solenoid 614, the electromagnetic adsorption force disappears, the first torsion spring 610 releases its stored energy to drive the first gear 608 to rotate, driving the two sets of first gears... The reverse movement of bar 607 causes slide 606 to slide towards the center along the first slide bar 611. At the same time, the restoring force of the first spring 612 assists in accelerating the reset process. During this process, the cross-arranged first connecting frame 603 and second connecting frame 604, through the synergistic action of slider 605 and rotating shaft, transform the linear motion of the outer guide rail 602 into the synchronous equidistant contraction of all adjusting frames 5. The spacing of the grid plates 3 rapidly decreases to form a dense arrangement. This dynamic adjustment allows the high-current arc to be cooled by multi-stage segmentation, while the low-current arc is quickly extinguished through the enhanced near-electrode effect.

[0029] In this embodiment, reference Figure 5 and Figure 6As shown, the quick-connect mechanism 7 includes two sets of brackets 701 slidably installed within the adjusting frame 5. Each set of brackets 701 has a fixedly mounted lever 702, and the levers 702 are respectively engaged with corresponding grid plates 3. Each set of brackets 701 has a fixedly mounted second rack 703, and a second gear 704 is provided between the two sets of second racks 703. The second gear 704 meshes with each of the two sets of second racks 703. The second gear 704 is rotatably connected to the adjusting frame 5 via a rotating rod 705. A handle 707 is rotatably mounted on the adjusting frame 5. A second sliding rod 710, corresponding to the brackets 701, is fixedly installed inside the adjusting frame 5. The two sets of brackets 701 are centrally symmetrically distributed about the rotating rod 705. A second torsion spring 706 is sleeved on the rotating rod 705, and both ends of the second torsion spring 706 are fixedly connected to the second gear 704 and the adjusting frame 5, respectively. The handle 707 is connected to the rotating rod... The components 705 are vertically distributed. A first bevel gear 708 is sleeved on the handle 707, and a second bevel gear 709 is sleeved on the rotating rod 705. The first bevel gear 708 and the second bevel gear 709 are meshed together. The clamp 701 is slidably sleeved with the corresponding second slide rod 710, and two sets of symmetrically distributed second springs 711 are sleeved on the second slide rod 710. The two ends of the two sets of second springs 711 are fixedly connected to the corresponding clamp 701 and the adjusting frame 5, respectively. The quick-connect mechanism 7 drives the clamp 701 to move in both directions through the transmission of the first bevel gear 708 and the second bevel gear 709 to realize the non-destructive installation and removal of the grid plate 3. The second torsion spring 706 ensures that the clamp rod 702 always maintains a stable clamping force. This structure realizes the adaptive switching of the arc extinguishing system from preventive wide spacing to protective close spacing through the organic combination of mechanical linkage and electromagnetic control, effectively balancing the arc extinguishing requirements under different fault currents.

[0030] In this embodiment, under normal power-on conditions, the power supply device 615 continuously supplies power to the solenoid 614. The resulting electromagnetic force attracts the metal block 613, causing the slide 606 to move the guide rail 602 outward. At this time, the first torsion spring 610 is in an energy-storing state, the first connecting frame 603 and the second connecting frame 604 are extended to their maximum angle, and all adjusting frames 5 maintain their maximum spacing under the action of the linkage mechanism. The three sets of grid plates form a relatively wide arc-extinguishing channel to accommodate normal current. When the system detects a fault current, the power supply device 615 immediately cuts off the power supply to the solenoid 614. The electromagnetic attraction force disappears, the first torsion spring 610 releases its stored energy to drive the first gear 608 to rotate, driving the two sets of first racks 607 to move in opposite directions, causing the slide 606 to slide along the first slide rod 611 towards the center. At the same time, the restoring force of the first spring 612 assists in accelerating the reset process. In this process, the first connecting frame 603 and the second connecting frame 604, arranged in a cross configuration, transform the linear motion of the outer guide rail 602 into the synchronous equidistant contraction of all adjusting frames 5 through the coordinated action of the slider 605 and the rotating shaft. The spacing of the grid plates 3 rapidly decreases to form a dense arrangement. This dynamic adjustment allows the high-current arc to be cooled by multi-stage segmentation, while the low-current arc is quickly extinguished through the enhanced near-electrode effect. The quick-connect mechanism 7 drives the card holder 701 to move in both directions through the transmission of the first bevel gear 708 and the second bevel gear 709, realizing the non-destructive disassembly and assembly of the grid plates 3. The second torsion spring 706 ensures that the card rod 702 always maintains a stable clamping force. This structure, through the organic combination of mechanical linkage and electromagnetic control, realizes the adaptive switching of the arc extinguishing system from preventive wide spacing to protective dense spacing, effectively balancing the arc extinguishing requirements under different fault currents.

[0031] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0032] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A built-in arc extinguishing structure of a circuit breaker (1), comprising a circuit breaker (1), characterized in that: The circuit breaker (1) is provided with a mounting plate (2), and the circuit breaker (1) is provided with a grid plate (3). An insulating rubber sheet (4) is embedded in the mounting plate (2). Multiple sets of equidistantly distributed adjustment frames (5) are slidably installed in the mounting plate (2). The multiple sets of adjustment frames (5) are fixedly bonded to the insulating rubber sheet (4). The multiple sets of adjustment frames (5) are correspondingly arranged with the grid plate (3). An adjustment mechanism (6) is provided in the mounting plate (2). A quick-connect mechanism (7) for fixing the grid plate (3) is provided on the adjustment frame (5). The adjusting mechanism (6) includes a mounting bracket (601) fixedly installed in the mounting plate (2). Two sets of symmetrically distributed guide rails (602) are slidably installed on the mounting bracket (601). Two sets of slides (606) are slidably installed on the mounting bracket (601). The two sets of slides (606) are fixedly connected to the two sets of guide rails (602) respectively. A first rack (607) is fixedly installed on each set of slides (606). A first gear (608) is provided between the two sets of first racks (607). The first gear (608) meshes with the two sets of first racks (607) respectively. The first gear (608) is connected to the mounting plate (2) via the mounting shaft (609). The mounting bracket (601) is rotatably connected, and the two sets of slides (606) are centrally symmetrically distributed about the mounting shaft (609). A first torsion spring (610) is sleeved on the mounting shaft (609). The two ends of the first torsion spring (610) are fixedly connected to the first gear (608) and the mounting bracket (601) respectively. A metal block (613) is fixedly installed on the outer slide (606). A solenoid (614) corresponding to the metal block (613) is fixedly installed inside the mounting bracket (601). A power supply device (615) is fixedly installed inside the mounting bracket (601), and the positive and negative poles of the solenoid (614) are electrically connected to the power supply device (615).

2. The arc suppression structure in a circuit breaker (1) according to claim 1, characterized in that: The mounting bracket (601) is fixedly installed with a first slide rod (611) corresponding to the slide (606). The slide (606) and the corresponding first slide rod (611) are slidably connected. Two sets of symmetrically distributed first springs (612) are sleeved on the first slide rod (611). The two ends of the two sets of first springs (612) are fixedly connected to the slide (606) and the mounting bracket (601) respectively. The two sets of adjustment brackets (5) on the outer side are fixedly connected to the corresponding guide rails (602) respectively. The multiple sets of adjustment brackets (5) on the inner side are slidably connected to the mounting bracket (601) and the guide rails (602) respectively.

3. The arc suppression structure in a circuit breaker (1) according to claim 1, characterized in that: Two sets of first connecting frames (603) and two sets of second connecting frames (604) are provided between two adjacent sets of adjustment frames (5). The upper ends of the two sets of first connecting frames (603) are rotatably connected by a rotating shaft. The lower ends of the two sets of first connecting frames (603) are rotatably mounted with sliders (605), and the sliders (605) are slidably connected to the corresponding adjustment frames (5). The lower ends of the two sets of second connecting frames (604) are rotatably connected by a rotating shaft, and the upper ends of the two sets of second connecting frames (604) are rotatably connected to the corresponding adjustment frames (5) by a rotating shaft.

4. The arc suppression structure in a circuit breaker (1) according to claim 1, characterized in that: The quick-connect mechanism (7) includes two sets of card holders (701) slidably installed in the adjusting frame (5). Each set of card holders (701) is fixedly installed with a card rod (702), and each set of card rods (702) is movably engaged with the corresponding grid plate (3). Each set of card holders (701) is fixedly installed with a second rack (703), and a second gear (704) is provided between the two sets of second racks (703). The second gear (704) is meshed with the two sets of second racks (703), and the second gear (704) is rotatably connected to the adjusting frame (5) through a rotating rod (705). A handle (707) is rotatably installed on the adjusting frame (5), and a second sliding rod (710) corresponding to the card holder (701) is fixedly installed inside the adjusting frame (5).

5. The arc suppression structure in a circuit breaker (1) according to claim 4, characterized in that: The two sets of card holders (701) are centrally symmetrical about the rotating rod (705). A second torsion spring (706) is sleeved on the rotating rod (705), and the two ends of the second torsion spring (706) are fixedly connected to the second gear (704) and the adjusting frame (5) respectively.

6. The arc suppression structure in a circuit breaker (1) according to claim 4, characterized in that: The handle (707) and the rotating rod (705) are vertically distributed. A first bevel gear (708) is sleeved on the handle (707), and a second bevel gear (709) is sleeved on the rotating rod (705). The first bevel gear (708) and the second bevel gear (709) are meshed together.

7. The arc suppression structure in a circuit breaker (1) according to claim 4, characterized in that: The card holder (701) is slidably sleeved with the corresponding second slide rod (710), and two sets of symmetrically distributed second springs (711) are sleeved on the second slide rod (710). The two ends of the two sets of second springs (711) are fixedly connected to the corresponding card holder (701) and the adjustment frame (5) respectively.

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