Arc extinguishing device

Abstract

An arc extinguishing device belongs to the technical field of switches. Comprising a pair of side walls and grid sheets arranged between the pair of side walls in an array mode, insulating pore plates of a deionization assembly are installed above the grid sheets, the insulating pore plates comprise vent holes in an array mode, the two insulating pore plates are stacked, a cavity is formed between the two insulating pore plates, and breakdown on the air outlet sides of the grid sheets is prevented. And meanwhile, the positioning effect of the grid plate can be effectively improved, so that the arc extinguishing device has a stable and reliable arc extinguishing effect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to switch technical field, concretely relates to an arc extinguishing device. BACKGROUND

[0002] Switch, especially disconnecting switch as important low-voltage electrical equipment, its realization controls the combination of carrying current and divides, to satisfy the management of power supply network on-off.

[0003] With the development of new energy, the high-voltage application scene of frame circuit breaker (or disconnecting switch) is more and more. The capacity requirement of arc extinguishing device is higher and higher. The existing arc extinguishing device mostly adopts the metal grid of interval array to improve arc voltage, thereby extinguishing arc. The high-voltage application scene needs more grid to meet the arc voltage rise to the range of design requirement. It is specifically shown that enough grid is needed to establish enough arc voltage for meeting the breaking requirement under the high-voltage application scene. However, the size of frame circuit breaker (or disconnecting switch) is limited, and in this environment, if the positioning of grid is unreliable, the grid will shake when arc enters the grid, at this time, the gap between adjacent grids cannot be guaranteed, leading to arc extinguishing failure. At the same time, breakdown easily occurs at the air outlet side of grid under high-voltage environment, that is, front breakdown. SUMMARY

[0004] The utility model discloses a kind of arc extinguishing devices, which is installed two stacked insulating hole plates at the air outlet side of grid, and cavity is formed between insulating hole plate, can effectively prevent breakdown that occurs at the air outlet side of grid.

[0005] The utility model discloses a kind of arc extinguishing devices, which is installed two stacked insulating hole plates at the air outlet side of grid, and cavity is formed between insulating hole plate, can effectively prevent breakdown that occurs at the air outlet side of grid.

[0006] In a specific embodiment of the utility model, the insulating hole plate has a coffered section extending upward on the side away from the grid, and a step cavity is formed below the coffered section, and the coffered section of the lower insulating hole plate is embedded into the step cavity of the upper insulating hole plate.

[0007] In a specific embodiment of the utility model, the grid has a positioning protrusion on the top, and a positioning hole is further provided on the lower insulating hole plate, and the positioning protrusion is embedded into the positioning hole.

[0008] In a specific embodiment of the utility model, the positioning hole is a counterbore.

[0009] In another specific embodiment of the utility model, only one positioning protrusion is arranged on the grid piece, and correspondingly, only one positioning hole is arranged on the insulating aperture plate for matching the grid piece.

[0010] In another specific embodiment of the utility model, the positioning protrusion is offset to one side of the center line of the grid piece, and the positioning protrusions on adjacent grid pieces are staggered.

[0011] In another specific embodiment of the utility model, the positioning protrusion is a trapezoidal protrusion.

[0012] In another specific embodiment of the utility model, the protrusion head of the positioning protrusion is provided with a round corner.

[0013] In another specific embodiment of the utility model, the upper edge of the grid piece abuts against the lower insulating aperture plate.

[0014] In another specific embodiment of the utility model, the positioning hole is a square hole, and an internal cavity in the form of a square pyramid is formed in the square hole.

[0015] The utility model has the beneficial effects of the above structure: the grid piece is installed in the arc extinguishing device, the insulating aperture plate of the arc extinguishing assembly is installed above the grid piece, the insulating aperture plate is two, a cavity is formed between the two insulating aperture plates to prevent breakdown at the gas outlet side of the grid piece. Meanwhile, the positioning protrusion on the grid piece is embeddedly matched with the positioning hole on the insulating aperture plate, the positioning effect of the grid piece is effectively improved, and the arc extinguishing device has stable and reliable arc extinguishing effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic view of the contact and arc extinguishing device of the utility model;

[0017] Figure 2 It is the three-dimensional schematic view of the arc extinguishing device of the utility model;

[0018] Figure 3 It is the explosion schematic view of the arc extinguishing device of the utility model;

[0019] Figure 4 It is the three-dimensional schematic view of the insulating plate of the utility model;

[0020] Figure 5 It is the front view schematic view of the insulating plate of the utility model;

[0021] Figure 6 It is the side view schematic view of the insulating plate of the utility model;

[0022] Figure 7The utility model discloses a schematic diagram of the grid array.

[0023] In the figure: 1. side wall, 11. first side wall, 12. second side wall, 2. grid, 21. positioning protrusion, 22. grid leg, 23. grid gap, 24. mounting gap, 25. positioning gap, 3. cover, 4. ionization elimination assembly, 41. insulating hole plate, 411. air hole, 412. positioning hole, 413. coffer section, 414. step, 42. filter assembly, 5. gas production piece, 6. positioning piece, 10. movable contact, 20. static contact, 30. arc extinguishing device, 100. insulating sleeve, 200. fastening screw, 300. observation hole, 400. positioning pin shaft, 500. sealing plate. DETAILED DESCRIPTION

[0024] The utility model discloses a schematic diagram of the grid array.

[0025] In the following description, any directional or positional concept of up, down, left, right, front and back is based on the position shown in the corresponding drawing, and is only provided for the convenience of describing the technical scheme of the utility model and simplifying the description, and therefore should not be understood as a special limitation on the technical scheme provided by the utility model.

[0026] As Figure 1 , the utility model discloses a schematic diagram of the switch. The switch includes a contact system, and the contact system includes a movable contact 10 and a static contact 20. The switch also includes an arc extinguishing device 30 corresponding to the contact system. The movable contact 10 and the static contact 20 are installed inside the housing of the switch. The arc extinguishing device 30 is installed at the upper opening of the housing and is located above the movable contact 10 and the static contact 20.

[0027] The movable contact 10 is usually rotatably arranged, and the static contact 20 is fixedly arranged. The movable contact 10 rotates to contact or separate from the static contact 20. When the two contacts, the contact system is in a closed state, and when the two are separated, they are in an open state.

[0028] As Figure 2 , Figure 3 , the arc extinguishing device 30 includes a pair of side walls 1, a grid 2 arranged between the pair of side walls 1, a cover 3 located at the top of the arc extinguishing device 30, a pair of gas production pieces 5 and an ionization elimination assembly 4 located above the grid 2.

[0029] The cover 3 is installed above the joint of the pair of side walls 1. The pair of side walls 1 and the cover 3 form the outer shell of the arc extinguishing device 30 after installation. Specifically, the pair of side walls 1 are a first side wall 11 and a second side wall 12. The array of the grid fins 2 is between the first side wall 11 and the second side wall 12.

[0030] The ion elimination assembly 4 is arranged in the cavity above the grid fins 2 formed by the joint of the first side wall 11 and the second side wall 12. Specifically, the ion elimination assembly 4 includes insulating hole plates 41 and filter assemblies 42. In the height direction of the arc extinguishing device 30, the insulating hole plates 41 are between the filter assemblies 42 and the grid fins 2. That is, the insulating hole plates 41 are installed above the grid fins 2, and the filter assemblies 42 are above the insulating hole plates 41. There are two insulating hole plates 41 and two filter assemblies 42. The two insulating hole plates 41 are stacked, and the two filter assemblies 42 are also stacked. The two filter assemblies 42 are installed above the two stacked insulating hole plates 41. This arrangement allows the metal mesh in the filter assembly 42 to have a cavity formed by the two insulating hole plates 41 at the outlet end of the grid fins 2, preventing front breakdown at the outlet side of the grid fins 2.

[0031] The gas generating members 5 are a pair of members attached to the inner side of a pair of fin legs of the grid fins 2. The pair of gas generating members 5 are arranged with opposite faces spaced apart, thereby forming an arc passage.

[0032] The arc extinguishing device 30 further includes positioning members 6 inserted into the fin legs of the grid fins 2 to prevent the arc gas from passing through the fin legs.

[0033] Positioning pins 400 are also arranged on the fin legs. The positioning pins 400 pass through the fin legs and the gas generating members 5, and the gas generating members 5 are fixed to the side walls 1 by screws.

[0034] A sealing plate 500 is arranged between the arc extinguishing device 30 and the mounting surface of the switch housing in the front-to-back direction of the arc extinguishing device 30, i.e., the array direction of the grid fins 2. The sealing plate 500 is usually made of rubber material with elasticity.

[0035] The arc extinguishing device 30 further includes an insulating sleeve 100 and a fastening screw 200. When the pair of side walls 1 are fastened by the fastening screw 200, the insulating sleeve 100 is sleeved on the fastening screw 200. The insulating sleeve 100 blocks the gap between the pair of side walls 1, thereby preventing the gas inside the arc extinguishing device 30 from contacting the fastening screw 200 through the gap, and improving the insulation of the arc extinguishing device 30.

[0036] At the same time, in order to facilitate the installation state of the above-mentioned insulating sleeve 100 is confirmed, in the pair of side walls 1 with the insulating sleeve 100 of the observation hole 300. Related personnel can be observed through the observation hole 300 whether the insulating sleeve 100 is installed. Preferably, the observation hole 300 is a through hole, the observation hole 300 is arranged in the up-down direction, that is, the observation hole 300 is arranged along the height direction of the arc extinguishing device 30.

[0037] As Figure 4 , Figure 5 , Figure 6 , the schematic diagram of the insulating hole plate 41. The insulating hole plate 41 includes an array of air holes 411. Preferably, the air hole 411 is a circular hole, and is uniformly distributed on the insulating hole plate 41. The air hole 411 should be a through hole, so that the gas can pass through the insulating hole plate 41.

[0038] The lower layer of the insulating hole plate 41 is also provided with a positioning hole 412, and the positioning hole 412 is used for connecting with the grid sheet 2, so that the top of the grid sheet 2 has a limiting structure for limiting the grid sheet 2, preventing the grid sheet 2 from shaking, and ensuring the stability of the gap between adjacent grid sheets 2. In order to prevent front breakdown, the positioning hole 412 is a counterbore, that is, the positioning hole 412 does not pass through the insulating hole plate 41.

[0039] The insulating hole plate 41 has a cofferdam part 413 extending upward away from the grid sheet 2. Specifically, for the upper layer of the insulating hole plate 41, it meets the assembly requirements between the insulating hole plate 41 and the filter assembly 42 above it, and can meet the design requirements of isolation when stacking. On the inner side wall of the cofferdam part 413, there is a step along 414 for abutting against the filter assembly 42.

[0040] Preferably, the insulating hole plate 41 is rectangular, and the cofferdam part 413 is rectangular frame-shaped and extends from the outer edge of the insulating hole plate 41 to one side to form. Preferably, the step along 414 is a straight strip, and is a pair, respectively located on the inner walls of the opposite sides of the cofferdam part 413. More preferably, the extension direction of the step along 414 is consistent with the array direction of the grid sheet 2. Around the insulating hole plate 41, and corresponding to the lower side of the cofferdam part 413, a step concave cavity is formed. For the two stacked insulating hole plates 41, the cofferdam part 413 of the lower insulating hole plate 41 is embedded into the step concave cavity of the upper insulating hole plate 41, ensuring the reliable sealing fit of the two. And, the step concave cavity of the lower layer is used to cooperate with the convex edge in the pair of side walls 1, so that the two have better air tightness after the equipment is completed.

[0041] Preferably, the positioning hole 412 is a square hole, and an internal cavity of a four-pyramid is formed inside.

[0042] As Figure 7 , is a schematic view of the grid sheet 2. The grid sheet 2 is arranged in an array of multiple and spaced from each other. The grid sheet 2 has a positioning protrusion 21 on the top, and the positioning protrusion 21 is embedded and matched with the positioning hole 412. The grid sheet 2 also includes a pair of grid legs 22, which extend downward from both sides of the cutting area of the grid sheet 2. A grid gap 23 is formed between the pair of grid legs 22, which is triangular in this embodiment, and the grid gaps 23 on adjacent grid sheets 2 are arranged staggered from each other. The mounting gap 24 is also provided on both sides of the grid sheet 2, which is used for plug-in with the positioning piece 6. The positioning gap 25 is also provided on one side of the grid gap 23, which is positioned and matched with the gas generating piece 5. Preferably, the positioning protrusion 21 is a trapezoidal protrusion, and has a round corner setting on the head of the protrusion, in order to facilitate the embedded and matched of the positioning protrusion 21 and the positioning hole 412 more smoothly. When the positioning protrusion 21 and the positioning hole 412 are embedded in place, the upper edge of the grid sheet 2 abuts against the insulating hole plate 41.

[0043] The positioning pin shaft 400 for positioning the grid sheet 2 is provided on the grid leg 22 of the grid sheet 2 in the middle.

[0044] In the embodiment, only one positioning protrusion 21 is arranged on one of the grid fins 2, and correspondingly, only one positioning hole 412 is arranged on the lower insulating hole plate 41 which is matched with the grid fin 2. Preferably, the positioning protrusion 21 is arranged on one side of the center line of the grid fin 2, and the positioning protrusions 21 on the adjacent grid fins 2 are staggered with each other. The adjacent grid fins 2 are reversely arranged. Since the positioning protrusions 21 on the adjacent grid fins 2 are staggered with each other, the positioning holes 412 form two rows correspondingly.

Claims

1. An arc quenching device comprising a pair of side walls (1), a plurality of fins (2) arranged between the pair of side walls (1), an insulating orifice plate (41) of a deionization assembly (4) mounted above the fins (2), the insulating orifice plate (41) comprising a plurality of ventilation orifices (411), characterized in that: Two insulating hole plates (41) are stacked on each other, a cavity is formed between the two insulating hole plates (41), and breakdown at the air outlet side of the grid sheet (2) is prevented.

2. An arc extinguishing device according to claim 1, characterized in that: The insulating hole plate (41) has a coffer (413) extending upward on the side away from the grid sheet (2), a step cavity is formed below the coffer (413), and the coffer (413) of the lower insulating hole plate (41) is embedded into the step cavity of the upper insulating hole plate (41).

3. An arc quenching device according to claim 1, characterized in that: The grid sheet (2) has a positioning protrusion (21) on the top, and the lower insulating hole plate (41) also has a positioning hole (412), and the positioning protrusion (21) and the positioning hole (412) are embedded and matched.

4. An arc quenching device according to claim 3, characterized in that: The positioning hole (412) is a counterbore.

5. An arc quenching device according to claim 3, characterized in that: There is only one positioning protrusion (21) on one grid sheet (2), and the corresponding positioning hole (412) on the insulating hole plate (41) is also only one.

6. An arc quenching device according to claim 5, characterized in that: The positioning protrusion (21) is offset to one side of the center line of the grid sheet (2), and the positioning protrusions (21) on the adjacent grid sheets (2) are staggered.

7. An arc quenching device according to claim 3, characterized in that: The positioning protrusion (21) is a trapezoidal protrusion.

8. An arc quenching device according to claim 7, characterized in that: The positioning protrusion (21) has a round corner on the protrusion head.

9. An arc quenching device according to claim 3, characterized in that: The upper edge of the grid sheet (2) abuts against the lower insulating hole plate (41).

10. An arc quenching device according to claim 3, characterized in that: The positioning hole (412) is a square hole, and a four-pyramid internal cavity is formed inside the square hole.

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