An arc extinguishing device
Patent Information
- Application Number
- CN202621245080.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-12
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2036-08-12
AI Technical Summary
[0004]本实用新型所要解决的技术问题是：克服现有灭弧排气结构的不足，提供一种可实现气流与熔渣分流隔绝的灭弧装置，在保证高温电弧气体足够冷却行程的同时，实现熔渣独立顺畅排出，避免气流通道堵塞与气体旁通外泄
1.通过内分流板与外盖板间隔设置形成中间冷却腔，配合两组错位布置的排气孔组形成折返气流路径，延长了高温电弧气体的冷却行程，提高了灭弧冷却效率。
Smart Images
Figure CN224759300U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electrical equipment technology, and specifically relates to an arc extinguishing device. Background Technology
[0002] Circuit breakers are equipped with arc-extinguishing devices. When a fault current is interrupted, a high-temperature arc will be generated between the contacts. The arc-extinguishing device relies on the grid plates to cut and cool the arc, quickly extinguishing the arc and ensuring the safe operation of electrical equipment.
[0003] Currently, the exhaust covers of circuit breaker arc-extinguishing devices are mainly divided into two types: one is a double-layer folded-back exhaust structure, and the other is a single-layer exhaust structure with a side slag discharge port. While the double-layer folded-back arc-extinguishing exhaust cover can extend the cooling path of high-temperature gas, the gas and molten metal slag share the same flow space, making it easy for slag to accumulate and block the airflow channel. If a single-layer exhaust structure with a side opening is used for slag discharge, high-temperature gas will leak directly from the side, shortening the cooling path and weakening the arc-extinguishing effect, failing to balance efficient cooling and smooth slag discharge. These defects can lead to exhaust channel blockage and arc-extinguishing performance degradation after long-term interruption operation, reducing the reliability of circuit breaker operation. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing arc extinguishing and exhaust structure and provide an arc extinguishing device that can realize the separation and isolation of airflow and molten slag. While ensuring sufficient cooling stroke of high-temperature arc gas, it can realize the independent and smooth discharge of molten slag and avoid blockage of airflow channel and gas bypass leakage.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An arc extinguishing device includes a grid assembly and grid supports disposed on its left and right sides, and also includes an exhaust top cover assembly covering the grid assembly. The exhaust top cover assembly includes an inner diversion plate and an outer cover plate that are spaced apart vertically, forming an intermediate cooling chamber between them; The inner diversion plate covers the top of the grid assembly, and its surface is provided with a first exhaust hole group that connects the inside of the grid assembly with the intermediate cooling cavity. Side slag discharge gaps are left between its left and right sides and the inner wall of the corresponding grid support. The outer cover plate is installed above the inner diverter plate, and its surface is provided with a second exhaust hole group that connects the intermediate cooling cavity with the outside. The first exhaust hole group and the second exhaust hole group are staggered. The outer cover plate is provided with a slag discharge structure, which is adapted to the side slag discharge gap arrangement and isolates the slag discharge channel from the intermediate cooling cavity.
[0006] The present invention is further configured such that the slag discharge structure is a side panel formed by the downward extension of the outer cover plate, the side panel blocks the openings on both sides of the intermediate cooling cavity, and the side panel and the inner wall of the grid support are spaced apart to form a side slag discharge port that connects the side slag discharge gap. The side slag discharge port and the side slag discharge gap cooperate to form a slag discharge channel.
[0007] The present invention is further configured such that the side slag discharge gap is directly opposite the upper part of the side edge of the grid assembly, and the molten metal generated by the grid can flow directly into the side slag discharge gap.
[0008] The present invention is further configured such that an insulating abutment section is integrally formed at the bottom end of the side panel, and the insulating abutment section contacts the upper surface of the inner diverter plate.
[0009] The present invention is further configured such that the first exhaust hole group is located on the side of the inner diverter plate away from the contact, and the second exhaust hole group is located on the side of the outer cover plate close to the contact. The staggered arrangement of the first exhaust hole group and the second exhaust hole group makes the intermediate cooling cavity form a reversible cooling airflow path.
[0010] The present invention is further configured such that the inner diverter plate and the outer cover plate are both snapped and fixed to the upper end of the grid plate bracket.
[0011] The present invention is further configured such that the front and rear ends of the outer cover plate are bent downward to form front and rear sealing edges, and the front and rear sealing edges are attached to the front and rear end faces of the inner diverter plate to block the front and rear openings of the intermediate cooling cavity.
[0012] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. An intermediate cooling chamber is formed by the spaced arrangement of the inner flow divider and the outer cover plate. Together with two sets of staggered exhaust holes, a reversible airflow path is formed, which extends the cooling path of the high-temperature arc gas and improves the arc extinguishing cooling efficiency.
[0013] 2. By cooperating with the side slag discharge gap, side slag discharge port and slag discharge outlet structure, an independent molten slag discharge channel is formed, realizing gas-slag diversion and isolation, and improving the slag discharge smoothness and anti-clogging ability of the arc extinguishing device.
[0014] 3. By sealing the opening of the cooling chamber with the front and rear edge sealing of the outer cover plate and the insulating contact limiting structure of the side panel, the risk of airflow short circuit and creepage is avoided, thereby improving the working stability and safety of the arc extinguishing device. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an assembly diagram of the present invention; Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at point AA; Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure at point BB.
[0016] The attached figures are labeled as follows: 1. Grid assembly; 2. Grid support; 3. Exhaust top cover assembly; 30. Inner diverter plate; 31. Outer cover plate; 4. Intermediate cooling chamber; 5. First exhaust port group; 6. Side slag discharge gap; 7. Second exhaust port group; 8. Side panel; 9. Side slag discharge port; 10. Slag discharge channel; 11. Insulating contact section; 12. Front and rear sealing edges. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-5 : Example: This embodiment provides an arc extinguishing device, including a grid plate assembly 1 and grid plate supports 2 disposed on its left and right sides, and also includes an exhaust top cover assembly 3 covering the grid plate assembly 1. The exhaust top cover assembly 3 includes an inner diversion plate 30 and an outer cover plate 31 arranged at intervals, with an intermediate cooling cavity 4 formed between them; The inner diversion plate 30 covers the top of the grid assembly 1, and its surface is provided with a first exhaust hole group 5 that connects the inside of the grid assembly 1 with the intermediate cooling cavity 4. Side slag discharge gaps 6 are left between its left and right sides and the inner wall of the corresponding grid support 2. The outer cover plate 31 is placed above the inner diversion plate 30, and its surface is provided with a second exhaust hole group 7 that connects the intermediate cooling cavity 4 with the outside. The first exhaust hole group 5 and the second exhaust hole group 7 are staggered. The outer cover plate 31 is provided with a slag discharge structure, which is adapted to the arrangement of the side slag discharge gap 6 and isolates the slag discharge channel 10 from the intermediate cooling cavity 4.
[0018] The arc-extinguishing device used in this embodiment includes a grid assembly 1 and two sets of grid supports 2. The two grid supports 2 are vertically arranged on the left and right sides of the grid assembly 1, respectively. The grid assembly 1 is clamped between the two grid supports 2. A slot structure is pre-cut at the upper end of each grid support 2. The slot is used to cooperate with the snap head on the side of the exhaust top cover assembly 3 to achieve assembly. The exhaust top cover assembly 3 is placed on top of the grid assembly 1. The exhaust top cover assembly 3 is composed of two components: an inner diversion plate 30 and an outer cover plate 31. The inner diversion plate 30 and the outer cover plate 31 are set vertically and separately, with a fixed receiving space between the two plates. This space is the intermediate cooling chamber 4. The inner diversion plate 30 is completely laid flat and covers the top end face of the grid assembly 1. The outer cover plate 31 is completely covered above the inner diversion plate 30. The left and right sides of the outer cover plate 31 are bent downward to form side panels 8. The front and rear ends of the outer cover plate 31 are aligned synchronously. The inner diverter plate 30 is bent downwards to form front and rear sealing edges 12. The left and right sides of the inner diverter plate 30 extend outwards to form integrally molded clips. The left and right sides of the outer cover plate 31 also extend outwards to form integrally molded clips. The clips of the inner diverter plate 30 and the outer cover plate 31 can be embedded into the pre-set clip slots at the upper end of the grid plate bracket 2. The clips are engaged by the interlocking of the clips and the slots. The two plates are assembled and positioned by the interlocking of the clips and the slots, without the use of bolts, adhesives or other additional connecting parts for binding.
[0019] The grid assembly 1 is composed of multiple metal plates stacked side by side, forming a long strip shape. The grid assembly 1 is only restrained by the inner side walls of the grid brackets 2 on both sides. The grid assembly 1 has no fixed assembly relationship with the exhaust top cover assembly 3 above. A gas collection gap is reserved between the inner diversion plate 30 and the top surface of the grid assembly 1. When the grid assembly 1 is working, it can cut the electric arc and generate molten metal at high temperature. The upper edge areas on the left and right sides of the grid assembly 1 are directly opposite the gap between the side of the inner diversion plate 30 and the inner wall of the grid bracket 2. The molten metal generated by the grid assembly 1 can slide directly into the gap under the action of gravity. The grid bracket 2 is a vertical long strip bracket structure. The inner side wall of the bracket continuously abuts against the side of the grid assembly 1 to achieve lateral limitation. The upper part of the bracket has a recessed slot. The outline of the slot matches the shape of the card head on the side of the inner diverter plate 30 and the outer cover plate 31. The card head can be completely embedded in the slot to achieve lateral limitation and vertical support. The inner side wall of the bracket also has a uniformly spaced gap between it and the side plate 8 extending downward from the outer cover plate 31. The slot and the card head are only in a concave-convex fitting relationship, without a locking structure.
[0020] The inner diversion plate 30 is a flat plate that is laid horizontally on the top of the grid assembly 1. The plate surface completely covers the entire upper area of the grid assembly 1. Several holes are opened through the plate surface. All the holes are combined to form the first exhaust hole group 5. The first exhaust hole group 5 is concentrated on the side of the inner diversion plate 30 away from the contact. The lower end of the hole connects to the internal space of the grid assembly 1, and the upper end of the hole connects to the upper intermediate cooling cavity 4, so as to guide the high-temperature arc gas generated inside the grid assembly 1 into the intermediate cooling cavity 4. The inner diversion plate 30 has integrally formed clips extending outward from its left and right sides. The clips on both sides are respectively embedded into the slots at the upper end of the left and right grid plate supports 2, and the overall snap-fit positioning is completed by the engagement of the clips and the slots. A continuous long gap is formed between the left and right sides of the inner diversion plate 30 and the inner wall of the grid plate support 2 on the same side. This gap is defined as the side slag discharge gap 6. The side slag discharge gap 6 extends completely along the grid plate stacking direction. The lower end of the gap is aligned with the upper edge of the side end of the grid plate assembly 1, and the upper end of the gap is connected to the side slag discharge port 9. The side slag discharge gap 6 is only used for the flow of molten metal and will not be interconnected with the intermediate cooling cavity 4. The upper surface of the inner diversion plate 30 will be in complete contact with the lower end face of the insulating abutment section 11 at the bottom of the side plate 8. The vertical distance between itself and the outer cover plate 31 is fixed by the downward pressing support of the side plate 8. The inner diversion plate 30 and the insulating abutment section 11 are only in planar contact and have no inlay or locking structure.
[0021] The outer cover plate 31 is a flat plate, horizontally positioned above the inner diversion plate 30. Its dimensions match those of the inner diversion plate 30, completely covering the upper space of the inner diversion plate 30. Several holes are formed through the outer cover plate 31, collectively constituting the second exhaust port group 7. This group is concentrated on the side of the outer cover plate 31 closest to the contact point. The lower ends of the holes connect to the intermediate cooling chamber 4, while the upper ends directly connect to the atmosphere outside the device. After cooling, the high-temperature gas can be discharged through the second exhaust port group 7. The second exhaust port group 7 and the first exhaust port group 5 are staggered on the horizontal plane, preventing the two groups from forming a vertically continuous gas channel. Therefore, the high-temperature gas cannot pass directly vertically through the two plates and must instead flow laterally back and forth within the intermediate cooling chamber 4. The left and right sides of the outer cover plate 31 are bent downwards to form side panels 8. The front and rear ends of the outer cover plate 31 are bent downwards to form front and rear sealing edges 12. The side panels 8 and the front and rear sealing edges 12 are all integral structures formed by bending the same piece of material as the outer cover plate 31, and there are no splicing gaps. The left and right edges of the outer cover plate 31 extend outwards to form integrated clips. The clips on both sides are embedded into the upper slots of the grid bracket 2 to complete the horizontal snap-fit positioning. The side panels 8 and the front and rear sealing edges 12 cooperate to enclose and seal the openings around the middle cooling cavity 4.
[0022] The outer cover plate 31 is integrally provided with a slag discharge and outgoing structure. The slag discharge and outgoing structure is integrally formed on the left and right sides of the outer cover plate 31. This structure is adapted to the position arrangement of the side slag discharge gap 6, and can separate the space for flowing molten slag and the intermediate cooling chamber 4 for containing high-temperature gas. In this embodiment, the specific forming form of the slag discharge and outgoing structure is a side panel 8. The side panel 8 is integrally formed by bending the outer cover plate 31 downwards. It has a vertical straight plate structure and extends along the length of the grid stack. The side panel 8 facing the middle cooling cavity 4 completely blocks the openings on the left and right sides of the middle cooling cavity 4. The side panel 8 and the inner wall of the grid support 2 on the same side maintain a fixed distance to form a long strip gap. This gap is the side slag discharge port 9. The side slag discharge port 9 extends continuously along the grid stacking direction. The lower end of the gap is directly opposite to the side slag discharge gap 6 and they are interconnected. The side slag discharge port 9 and the side slag discharge gap 6 cooperate to form a complete slag discharge channel 10. The slag discharge channel 10 is completely isolated from the middle cooling cavity 4 and can only allow molten metal to flow outward. High temperature gas will not overflow from the slag discharge channel 10. The side panel 8 and the inner wall of the grid support 2 are only spatially spaced and there is no contact assembly relationship between them.
[0023] An integrally formed insulating abutment section 11 is formed at the bottom of the side panel 8. The insulating abutment section 11 extends integrally along the overall length of the side panel 8. The lower end face of the insulating abutment section 11 is completely attached to the upper surface of the inner diverter plate 30. The insulating abutment section 11 presses down on the inner diverter plate 30 to form support, stably maintaining the vertical distance between the inner diverter plate 30 and the outer cover plate 31, ensuring that the space size of the intermediate cooling cavity 4 remains constant. The insulating abutment section 11 is made of insulating material, which can block the conductive path formed by the direct contact between the side panel 8 and the inner diverter plate 30, reducing the risk of creepage and leakage under high temperature arc conditions. The insulating abutment section 11 is integrally formed with the side panel 8 through an insert composite process, and there are no assembly splicing gaps, adhesives, or fastener connections between the two. The front and rear sealing edges 12 formed by bending the front and rear ends of the outer cover plate 31 downwards are vertical straight plate structures. The front and rear sealing edges 12 are bent inwards respectively, and the inner end face of the sealing edge is completely attached to the front and rear end faces of the inner diversion plate 30. The plate surface is attached to seal the openings at the front and rear ends of the intermediate cooling cavity 4, preventing high temperature gas from bypassing and overflowing from the front and rear sides of the cavity. This forces all high temperature gas to only be able to complete the reverse flow through the two sets of staggered exhaust holes. The front and rear sealing edges 12 and the outer cover plate 31 are integrally bent components. The front and rear sealing edges 12 and the inner diversion plate 30 are only in end face contact, without any locking or plugging structure.
[0024] The inner diversion plate 30 and the outer cover plate 31 are separated and enclosed to form an intermediate cooling cavity 4. The intermediate cooling cavity 4 is completely enclosed and sealed by the side panels 8 and the front and rear sealing edges 12. The cavity is only connected to the external space through the first exhaust hole group 5, the second exhaust hole group 7, and the cavity itself. There are no straight open passages on the sides or front and rear sides inside the cavity. The cavity is arranged directly above the grid assembly 1 and between the two plates. It is mainly used to contain high-temperature electric arc gas. The cooling time of the gas is extended by the return path inside the cavity. The intermediate cooling cavity 4 is enclosed by the upper surface of the inner diversion plate 30, the lower surface of the outer cover plate 31, the inner side wall of the side panel 8, and the inner side wall of the front and rear sealing edges 12. The plate surfaces are only in a bent integral shape or in contact with each other.
[0025] During the actual operation of the arc extinguishing device, the circuit breaker interrupts the current and generates an electric arc. The electric arc enters the grid assembly 1 and is cut by the grid. The high-temperature gas generated by the electric arc passes upward through the first exhaust hole group 5 on the inner diversion plate 30 and enters the intermediate cooling chamber 4 between the two plates. The left, right and front and rear openings of the intermediate cooling chamber 4 are blocked by the side panels 8 and the front and rear sealing edges 12, respectively. The two sets of exhaust holes are located at both ends of the cavity and are staggered with each other. The gas cannot be discharged vertically and can only travel laterally back and forth along the inside of the intermediate cooling chamber 4. The gas is cooled during the flow process. After cooling, the gas passes through the second exhaust hole group 7 on the outer cover plate 31 and is discharged to the outside of the device.
[0026] The electric arc melts the grid plate at high temperature to form molten metal. The molten metal adheres to the upper edges of both sides of the grid plate assembly 1 and slides down under its own gravity, flowing directly into the side slag discharge gap 6 between the side of the inner diversion plate 30 and the inner wall of the grid plate support 2. After flowing down the side slag discharge gap 6, the molten metal enters the side slag discharge port 9 formed by the gap between the side wall plate 8 and the inner wall of the grid plate support 2, and is finally discharged outward through the side slag discharge port 9. The side wall plate 8 blocks the openings on both sides of the intermediate cooling chamber 4, so that the slag discharge channel 10 for molten slag flow and the intermediate cooling chamber 4 for storing high-temperature gas are completely separated. The high-temperature gas will not leak out from the side slag discharge channel 10, avoiding shortening the gas cooling path and ensuring the cooling effect.
[0027] The entire exhaust top cover assembly 3 relies on the snap-fit of the inner diversion plate 30 and the outer cover plate 31 into the slot at the upper end of the grid bracket 2 to achieve snap-fit assembly and positioning. The insulating abutment section 11 at the bottom of the side panel 8 presses down and adheres to the upper surface of the inner diversion plate 30, stably maintaining the cavity height between the two plates. At the same time, the insulating abutment section 11 isolates the conductive contact between the two plates, reducing the possibility of insulation failure under high temperature conditions. The inner end faces of the front and rear sealing edges 12 at both ends of the outer cover plate 31 are attached to the front and rear end faces of the inner diversion plate 30, sealing the front and rear openings of the cavity, preventing gas from bypassing from the front and rear sides of the cavity, and ensuring that the high temperature gas completely completes the return cooling path inside the cavity.
[0028] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. An arc extinguishing device comprising a grid assembly (1) and a grid support (2) arranged on the left and right sides of the grid assembly (1), characterized in that, It also includes an exhaust top cover assembly (3) that is placed on top of the grid assembly (1); The exhaust top cover assembly (3) includes an inner diversion plate (30) and an outer cover plate (31) arranged at an upper and lower interval, forming an intermediate cooling cavity (4) between the two. The inner diversion plate (30) covers the top of the grid assembly (1), and its surface is provided with a first exhaust hole group (5) that connects the inside of the grid assembly (1) with the intermediate cooling chamber (4). Side slag discharge gaps (6) are left between its left and right sides and the inner wall of the corresponding grid support (2). The outer cover plate (31) is placed above the inner diversion plate (30), and its surface is provided with a second exhaust hole group (7) that connects the intermediate cooling cavity (4) with the outside. The first exhaust hole group (5) and the second exhaust hole group (7) are staggered. The outer cover plate (31) is provided with a slag discharge structure, which is adapted to the side slag discharge gap (6) and isolates the slag discharge channel (10) from the intermediate cooling cavity (4).
2. An arc extinguishing device according to claim 1, characterized in that The slag discharge structure is a side panel (8) formed by the downward extension of the outer cover plate (31). The side panel (8) blocks the openings on both sides of the intermediate cooling cavity (4). The side panel (8) and the inner wall of the grid support (2) are spaced apart to form a side slag discharge port (9) that connects the side slag discharge gap (6). The side slag discharge port (9) and the side slag discharge gap (6) cooperate to form a slag discharge channel (10).
3. The arc-extinguishing device according to claim 2, characterized in that, The side slag discharge gap (6) is directly opposite the upper part of the side edge of the grid assembly (1), and the molten metal generated by the grid can flow directly into the side slag discharge gap (6).
4. The arc-extinguishing device according to claim 2, characterized in that, The bottom end of the side panel (8) is integrally formed with an insulating abutment section (11), which is in contact with the upper surface of the inner diverter plate (30).
5. The arc-extinguishing device according to claim 1, characterized in that, The first exhaust port group (5) is located on the side of the inner diverter plate (30) away from the contact, and the second exhaust port group (7) is located on the side of the outer cover plate (31) close to the contact. The staggered arrangement of the first exhaust port group (5) and the second exhaust port group (7) makes the intermediate cooling cavity (4) form a reversible cooling airflow path.
6. The arc-extinguishing device according to claim 1, characterized in that, The inner diverter plate (30) and the outer cover plate (31) are both snapped and fixed to the upper end of the grid bracket (2).
7. The arc-extinguishing device according to claim 1, characterized in that, The front and rear ends of the outer cover plate (31) are bent downward to form front and rear sealing edges (12). The front and rear sealing edges (12) fit the front and rear ends of the inner diversion plate (30) to block the front and rear openings of the intermediate cooling cavity (4).