Arc extinguishing chamber of circuit breaker

Abstract

The utility model relates to the technical field of arc extinguishing chambers, in particular to an arc extinguishing chamber of a circuit breaker. The problem of high manufacturing cost of the arc extinguishing chamber of the circuit breaker in the prior art is solved, and the practicability of equipment is improved. The arc extinguishing chamber structurally comprises an arc extinguishing chamber body, a plurality of partition plates are arranged in the arc extinguishing chamber body and divide the arc extinguishing chamber into a plurality of arc extinguishing chambers, the two sides of each arc extinguishing chamber are provided with a switch installation area and an arc generation area respectively, the top of the arc generation area is further provided with an arc breaking groove, the cross section of the arc generation area is of a right trapezoid structure, and the switch installation area is of a rectangular structure. The top of the switch installation area is provided with a plurality of switch gaps. According to the embodiment, the design that a plurality of arc extinguishing sheets are clamped in the arc extinguishing chamber in the prior art is replaced, the manufacturing cost of the arc extinguishing chamber is reduced, and the practicability is high.

Description

Technical Field

[0001] This utility model relates to the field of arc extinguishing cover technology, specifically to an arc extinguishing cover for a circuit breaker. Background Technology

[0002] During circuit breaker operation, an electric arc may occur between the circuit breaker contacts when the current is interrupted. If the arc is not extinguished quickly, it may cause equipment damage or fire hazards. The function of the arc extinguishing chamber is to quickly and effectively extinguish the arc when the circuit breaker contacts separate, preventing the arc from continuing or growing excessively, ensuring that the circuit breaker can normally interrupt the current and protect electrical equipment from damage.

[0003] To improve the arc-extinguishing effect, existing circuit breakers have several arc-extinguishing plates spaced at intervals within the arc-extinguishing chamber. These plates are secured to the chamber using clips.

[0004] While this method can extinguish the arc of the circuit breaker, the following problems still exist: Since multiple arc extinguishing plates are installed, during assembly, the arc extinguishing plates need to be assembled one by one onto the top of the arc extinguishing chamber, which not only increases the assembly cost, but also increases the molding cost and manufacturing difficulty due to the snap-fit ​​structure between the arc extinguishing plates and the arc extinguishing chamber. Utility Model Content

[0005] This utility model proposes a circuit breaker arc extinguishing cover, which solves the problem of high manufacturing cost of circuit breaker arc extinguishing covers in the prior art and improves the practicality of the equipment.

[0006] The technical solution of this utility model is as follows:

[0007] A circuit breaker arc-extinguishing enclosure includes an arc-extinguishing enclosure body.

[0008] The arc-extinguishing hood body is provided with several partitions, which divide the arc-extinguishing hood into several arc-extinguishing chambers. Each arc-extinguishing chamber has a switch installation area and an arc generation area on both sides. The top of the arc generation area is also provided with an arc-breaking groove. The cross-section of the arc generation area is a right-angled trapezoidal structure. The switch installation area is a rectangular structure. The top of the switch installation area is provided with several switch notches.

[0009] Furthermore, each of the partitions has a mounting hole on the side near the switch mounting area, and each mounting hole is connected to an adjacent arc-extinguishing chamber on both sides. The mounting hole has a semi-circular structure, and the inner wall of the mounting hole is provided with a first positioning groove. The partition is also provided with several material-stealing grooves.

[0010] Furthermore, the arc extinguishing cover body has several second positioning grooves on both sides, the second positioning grooves are arc-shaped, the arc extinguishing cover body is also provided with several first threaded holes, and the arc generating area is also fixed with several third positioning grooves away from the switch installation area, the cross-section of the third positioning grooves is rectangular.

[0011] Furthermore, mounting grooves are provided on the side walls on both sides of the arc generating area, and the cross-section of the mounting grooves is an isosceles trapezoidal structure.

[0012] Furthermore, the arc-breaking groove is provided with a shock-absorbing layer, and the arc-breaking layer is provided on the shock-absorbing layer. The shock-absorbing layer is made of rubber material, and the arc-breaking layer is made of copper material. The arc-breaking layer, the shock-absorbing layer and the arc-breaking groove are fixed together by adhesive bonding. The arc-extinguishing cover body is also provided with several heat dissipation grooves on the side near the arc-breaking groove.

[0013] Furthermore, several reinforcing ribs are fixed on the top corner side of the switch mounting area, and a positioning block is provided on the top of the arc generating area, the positioning block having a triangular cross-section.

[0014] Furthermore, the top of the arc generating area is provided with an insulating layer, which is composed of nanomaterials. The arc extinguishing hood body is composed of epoxy resin material. The arc extinguishing hood body is also provided with a placement groove. The cross-section of the placement groove is square. The bottom of the placement groove is provided with a second threaded hole. A cooling box is provided inside the placement groove. The cooling box is fixed to the second threaded hole by bolts. Cooling oil is provided inside the cooling box.

[0015] The working principle and beneficial effects of this utility model are as follows:

[0016] The installation process in this embodiment is as follows: First, the fixed contact is slidably installed into the mounting slot. Then, the cooling box is placed in the placement slot and fixed in the placement slot with bolts. Then, the switch rocker arm passes through the switch notch of the arc extinguishing cover body. The switch is positioned in the arc extinguishing cover body through the first positioning slot in the mounting hole. Finally, the arc extinguishing cover is fixedly installed on the circuit breaker through the positioning slot, thus completing the installation.

[0017] This embodiment features several arc-extinguishing chambers within the arc-extinguishing shroud body, dividing each chamber into a switch mounting area and a top contact area. By incorporating an arc-breaking groove at the top of the arc-generating area, and utilizing the right-angled trapezoidal structure of the arc-generating area, the arc can more easily enter the arc-breaking groove via the inclined surface at the top. When the moving contact of the switch approaches the arc-breaking groove, the arc is attracted by the groove, effectively extinguishing the arc. This design replaces the existing method of attaching several arc-extinguishing plates within the arc-extinguishing shroud, reducing the manufacturing cost of the arc-extinguishing shroud and enhancing its practicality. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the existing technology;

[0020] Figure 2This is a schematic diagram of the overall structure of this embodiment without the cooling box installed;

[0021] Figure 3 This is a schematic diagram of the overall structure of this embodiment. Figure 1 ;

[0022] Figure 4 This is a schematic diagram of the overall structure of this embodiment. Figure 2 ;

[0023] Figure 5 This is a schematic diagram of the arc-breaking layer in this embodiment.

[0024] In the picture:

[0025] 1. Arc extinguishing chamber body; 11. Second positioning groove; 12. Switch notch; 13. Third positioning groove; 14. First threaded hole; 2. Placement groove; 21. Second threaded hole; 3. Heat dissipation groove; 4. Cooling box; 5. Mounting groove; 6. Arc breaking groove; 61. Shock-absorbing layer; 62. Arc breaking layer; 7. Positioning block; 8. Arc extinguishing chamber; 81. Switch mounting area; 811. Reinforcing rib; 82. Arc generating area; 821. Insulation layer; 9. Partition plate; 91. Mounting hole; 92. First positioning groove; 93. Material stealing groove. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0027] like Figures 2-5 As shown, this embodiment proposes a circuit breaker arc-extinguishing cover, the structure of which includes an arc-extinguishing cover body 1.

[0028] In this embodiment, several partitions 9 are disposed inside the arc-extinguishing chamber body 1, dividing the arc-extinguishing chamber into several arc-extinguishing chambers 8. A switch mounting area 81 and an arc-generating area 82 are respectively disposed on both sides of each arc-extinguishing chamber 8. An arc-breaking groove 6 is disposed at the top of the arc-generating area 82. The arc-generating area 82 has a right-angled trapezoidal cross-section, while the switch mounting area 81 has a rectangular structure. Several switch notches 12 are disposed at the top of the switch mounting area 81 to facilitate switch installation and control switch rotation. In this embodiment, the arc-extinguishing chamber can be divided into several arc-extinguishing chambers 8 by the partitions 9 according to actual needs. In the figure, the circuit breaker, being connected to three-phase power, is divided into three arc-extinguishing chambers 8, each extinguishing the arc of the three phases. The arc-generating area 82 in this embodiment adopts a right-angled trapezoidal structure. This is so that when the moving contact in the arc-generating area 82 moves away from the fixed contact, the arc generated will be guided through the inclined surface at the top of the arc-generating area 82 into the arc-breaking groove 6, thereby reducing the risk of arcing.

[0029] In this embodiment, mounting holes 91 are located on the side of each partition 9 near the switch mounting area 81. Each mounting hole 91 connects to adjacent arc-extinguishing chambers 8 on both sides. The mounting holes 91 have a semi-circular structure, and a first positioning groove 92 is located on the inner wall of the mounting hole 91. Several material-saving grooves 93 are located inside the partition 9, which can save material used in manufacturing the partition 9, reducing production costs, and also provide gaps in the partition 9 to improve heat transfer in the arc-generating area 82, facilitating heat dissipation when an arc occurs. This design is for convenient switch installation. The mounting holes 91 are designed to house the switch, allowing it to simultaneously control the on / off state of three-phase power, while the first positioning groove 92 ensures more accurate switch installation.

[0030] In this embodiment, several second positioning grooves 11 are disposed on both sides of the arc-extinguishing chamber body 1. The second positioning grooves 11 have an arc-shaped structure. Several first threaded holes 14 are disposed on the arc-extinguishing chamber body 1. Several third positioning grooves 13 are fixedly disposed in the arc-generating area 82 away from the switch mounting area 81. The cross-section of the third positioning grooves 13 is rectangular. In this embodiment, the second positioning grooves 11 position the arc-extinguishing chamber body 1 inside the circuit breaker, the third positioning grooves 13 position the arc-extinguishing chamber body 1 and the circuit breaker's wiring port, and the first threaded holes 14 ensure the arc-extinguishing chamber body 1 is fixedly connected to the circuit breaker. This design makes it easier to disassemble and install the arc-extinguishing chamber body 1 and the arc-extinguishing chamber 8, and avoids the accumulation of metal impurities generated by the arc in the arc-extinguishing chamber 8 due to long-term use.

[0031] In this embodiment, the mounting groove 5 is located on the side walls on both sides of the arc generating zone 82, and the cross-section of the mounting groove 5 is an isosceles trapezoidal structure. This design is to facilitate the installation of the stationary contacts in the circuit breaker. In this embodiment, the stationary contacts can be slidably installed into the mounting groove 5. Since the cross-section of the mounting groove 5 is an isosceles trapezoidal structure, the installation of the stationary contacts is more stable and reliable, and it is less likely to cause installation misalignment.

[0032] In this embodiment, the shock-absorbing layer 61 is disposed within the arc-breaking groove 6, and the arc-breaking layer 62 is disposed on top of the shock-absorbing layer 61. The shock-absorbing layer 61 is made of rubber material, and the arc-breaking layer 62 is made of copper material. The arc-breaking layer 62, the shock-absorbing layer 61, and the arc-breaking groove 6 are fixed together by adhesive bonding. Several heat dissipation grooves 3 are disposed on the side of the arc-extinguishing cover body 1 near the arc-breaking groove 6. These heat dissipation grooves 3 are disposed on the surface of the arc-extinguishing cover body 1, increasing the heat dissipation area of ​​the arc-extinguishing cover body 1, thus giving the arc-extinguishing cover good heat dissipation capacity. In this embodiment, the shock-absorbing layer 61 is used to reduce the impact damage to the arc-breaking groove 6 caused by the moving contact switch. Copper is a material with excellent electrical conductivity, and its conductivity is close to that of silver. Therefore, using copper in the arc-breaking groove 6 can effectively carry the current passing through the arc. Copper can quickly conduct current and avoid overheating of the material due to excessive current, helping to ensure the rapid extinguishing of the arc. Moreover, copper has good heat resistance, preventing the material from being damaged due to excessively high arc temperatures.

[0033] In this embodiment, several reinforcing ribs 811 are fixedly installed on the top corner side of the switch mounting area 81, and the positioning block 7 is installed on the top of the arc generating area 82. The positioning block 7 has a triangular cross-section, which is used to facilitate the installation and fixing of the arc extinguishing cover body 1 onto the circuit breaker. Since the switch mounting area 81 needs to accommodate the rotation of the switch, it requires sufficient space. The design of the reinforcing ribs 811, to some extent, compensates for the structural instability caused by increasing the space of the switch mounting area 81.

[0034] In this embodiment, the insulating layer 821 is disposed on top of the arc generating zone 82. The insulating layer 821 is composed of nanomaterials. The arc extinguishing chamber body 1 is composed of epoxy resin. The placement groove 2 is disposed on the arc extinguishing chamber body 1. The cross-section of the placement groove 2 is square. The second threaded hole 21 is disposed at the bottom of the placement groove 2. The cooling box 4 is disposed inside the placement groove 2. The cooling box 4 is fixed to the second threaded hole 21 by bolts. Cooling oil is disposed inside the cooling box 4. Arc generation inside the arc extinguishing chamber may produce metal impurities, dust, and other foreign matter. Using nanomaterials as the insulating layer 821 on top of the arc generating zone 82 not only improves insulation, high temperature resistance, and thermal conductivity, but also increases the mechanical strength, oxidation resistance, and corrosion resistance of the material, thereby significantly improving the performance and safety of the circuit breaker. Moreover, its smooth surface, anti-pollution properties, and corrosion resistance make cleaning easier.

[0035] The installation process of this embodiment is as follows: First, the fixed contact is slidably installed into the mounting groove 5. Then, the cooling box 4 is placed in the placement groove 2 and fixed in the placement groove 2 with bolts. Then, the switch rocker arm passes through the switch notch 12 of the arc extinguishing cover body 1. The switch is positioned in the arc extinguishing cover body 1 through the first positioning groove 92 in the mounting hole 91. Finally, the arc extinguishing cover is fixedly installed on the circuit breaker through the positioning groove, thus completing the installation.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A circuit breaker arc-extinguishing cover, comprising an arc-extinguishing cover body (1), characterized in that, The arc-extinguishing cover body (1) is provided with several partitions (9), which divide the arc-extinguishing cover into several arc-extinguishing chambers (8). Each arc-extinguishing chamber (8) has a switch installation area (81) and an arc generation area (82) on both sides. The top of the arc generation area (82) is also provided with an arc-breaking groove (6). The cross-section of the arc generation area (82) is a right-angled trapezoidal structure. The switch installation area (81) is a rectangular structure. The top of the switch installation area (81) is provided with several switch notches (12).

2. The arc chute of claim 1, wherein, Each partition (9) has a mounting hole (91) on the side near the switch mounting area (81). Each mounting hole (91) is connected to an adjacent arc-extinguishing chamber (8) on both sides. The mounting hole (91) is a semi-circular structure. The inner wall of the mounting hole (91) is provided with a first positioning groove (92). The partition (9) is also provided with several material-stealing grooves (93).

3. The circuit breaker arc-extinguishing cover according to claim 2, characterized in that, The arc extinguishing cover body (1) has several second positioning grooves (11) on both sides. The second positioning grooves (11) are arc-shaped. The arc extinguishing cover body (1) also has several first threaded holes (14). The arc generating area (82) is far from the switch installation area (81) and several third positioning grooves (13) are fixed thereon. The cross-section of the third positioning groove (13) is rectangular.

4. The arc-extinguishing cover of a circuit breaker according to claim 1, characterized in that, The side walls on both sides of the arc generating area (82) are provided with mounting grooves (5), and the cross-section of the mounting grooves (5) is an isosceles trapezoidal structure.

5. The arc-extinguishing cover for a circuit breaker according to claim 1, characterized in that, The arc-breaking groove (6) is provided with a shock-absorbing layer (61), and an arc-breaking layer (62) is provided on the shock-absorbing layer (61). The shock-absorbing layer (61) is made of rubber material, and the arc-breaking layer (62) is made of copper material. The arc-breaking layer (62), the shock-absorbing layer (61) and the arc-breaking groove (6) are fixed together by adhesive. The arc-extinguishing cover body (1) is also provided with several heat dissipation grooves (3) on the side near the arc-breaking groove (6).

6. The arc-extinguishing cover of a circuit breaker according to claim 1, characterized in that, Several reinforcing ribs (811) are fixed at the top corner of the switch installation area (81), and a positioning block (7) is provided at the top of the arc generation area (82). The cross-section of the positioning block (7) is triangular.

7. The arc-extinguishing cover for a circuit breaker according to claim 6, characterized in that, The top of the arc generating area (82) is also provided with an insulating layer (821), which is made of nanomaterials. The arc extinguishing cover body (1) is made of epoxy resin material. The arc extinguishing cover body (1) is also provided with a placement groove (2). The cross-section of the placement groove (2) is square. The bottom of the placement groove (2) is provided with a second threaded hole (21). The placement groove (2) is provided with a cooling box (4). The cooling box (4) is fixed to the second threaded hole (21) by bolts. The cooling box (4) is provided with cooling oil.

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