Arc extinguish chamber of switch

Abstract

An arc extinguish chamber of a switch belongs to the technical field of switches. Which comprises a pair of side plates, a plurality of grid sheets arrayed between the pair of side plates, a pore plate mounted on the air outlet sides of the plurality of grid sheets in a matched manner, and a plurality of air outlet holes formed in the pore plate, and is characterized in that in the width direction of the plurality of arrayed grid sheets, the vent holes comprise side hole columns positioned on the two side edges and a middle hole column positioned between the two side hole columns; the ratio of the aperture D of the vent holes in the middle hole row to the aperture d of the vent holes in the side hole rows is 1lt; d / dlt; 3. The arc extinguishing chamber has the advantages that the arc is concentrated in the middle by changing the airflow field in the arc extinguishing chamber, so that the arc can fully enter the grid plate group, the arc voltage is improved to accelerate the arc extinguishing, and the arc extinguishing performance of the arc extinguishing chamber is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to switch technical field, and specifically relates to a switch's arc extinguishing chamber. BACKGROUND

[0002] Switch is a kind of very important electric appliance in power supply and distribution circuit, can cut off the current to realize the opening of circuit, play the role of protecting line and electrical equipment.Switch usually includes contact system, and contact system includes movable contact and static contact, movable contact is contacted or separated after action with static contact, and then make switch itself realize conduction or opening.As known in the industry, when switch breaks, arc is generated between movable contact and static contact, and since arc energy is relatively large, it causes great difficulty to switch breaking.In view of this, switch usually also includes an arc extinguishing chamber, for extinguishing arc generated when movable contact and static contact are separated, only when arc is extinguished, circuit is disconnected.Arc extinguishing chamber plays an important role in ensuring the safe operation of electrical equipment.

[0003] When movable contact and static contact are separated, arc is generated between them, but only when arc enters the interior of arc extinguishing chamber and fully enters the grid piece group in the interior of arc extinguishing chamber, arc voltage can be significantly improved, and the improvement of arc voltage is crucial to the extinguishing of arc.For this reason, ordinary skilled in the art has been pursuing how to make arc fully enter the grid piece group, and then benefit the rapid extinguishing of arc. SUMMARY

[0004] The utility model relates to a switch's arc extinguishing chamber, which changes the airflow field in the interior of the arc extinguishing chamber to concentrate the arc in the middle, facilitates the full entry of the arc into the grid piece group, and improves the arc voltage to accelerate the extinguishing of the arc.

[0005] The utility model is achieved by providing a switch's arc extinguishing chamber, which includes a pair of side plates, a plurality of grid pieces arranged between the pair of side plates, a hole plate installed on the air outlet side of the plurality of grid pieces, a plurality of air outlet holes formed in the hole plate, and a plurality of air holes including a side hole column on both sides, a middle hole column between the two side hole columns, and a ratio of the hole diameter D of the air holes in the middle hole column to the hole diameter d of the air holes in the side hole column being 1

[0006] In one specific embodiment of the utility model, the switch further includes a contact system, the contact system includes a movable contact and a static contact, and the plurality of grid pieces arranged form a first grid piece group, a second grid piece group and a third grid piece group, the first grid piece group is located on one side of the movable contact, the third grid piece group is located on one side of the static contact, and the second grid piece group is located between the first grid piece group and the third grid piece group.

[0007] In another specific embodiment of the utility model, the first grid piece group is short grid piece, and the second grid piece group and the third grid piece group are long grid piece.

[0008] In another specific embodiment of the utility model, the first grid piece group is short grid piece, and the second grid piece group and the third grid piece group are long grid piece.

[0009] In another specific embodiment of the utility model, the intermediate hole row includes first vent hole and second vent hole, wherein the ratio of the aperture d2 of the second vent hole to the aperture d1 of the first vent hole is 1 < d2 / d1 < 2, in at least part of the row along the direction of the plurality of grid piece arrays, the first vent hole and the second vent hole are arranged at intervals after forming an array, the first vent hole array corresponds to the second grid piece group, and the second vent hole array corresponds to the first grid piece group and the third grid piece group.

[0010] In another specific embodiment of the utility model, in the middle of the intermediate hole row, the second vent hole array is located at both ends of the first vent hole array.

[0011] In another specific embodiment of the utility model, the first grid piece group and the second grid piece group adjacent grid piece between the grid piece gap and the first grid piece group between the grid piece gap is equal, and the second grid piece group and the third grid piece group adjacent grid piece between the grid piece gap and the third grid piece group between the grid piece gap is equal.

[0012] In another specific embodiment of the utility model, the arc extinguishing chamber further includes a bracket, the bracket is in the shape of a square box, and an arc extinguishing element is arranged above the aperture plate, and the aperture plate and the arc extinguishing element are located in the inner cavity of the bracket.

[0013] In another specific embodiment of the utility model, the arc extinguishing chamber further includes a gas generating element, and the gas generating element covers the grid piece legs of the plurality of grid pieces.

[0014] In another specific embodiment of the utility model, the arc extinguishing chamber further includes a dynamic arc striking piece, one end of the dynamic arc striking piece is located outside the first grid piece group, and the dynamic arc striking piece is bent to surround the first grid piece group and extend to the middle of the arc extinguishing chamber.

[0015] The utility model discloses a structure has the beneficial effect that the hole diameter of the middle hole is greater than the hole diameter of the two sides in the width direction of the plurality of grid sheets on the orifice plate above the grid sheet, thereby changing the airflow field inside the arc extinguishing chamber, making the arc concentrate in the middle, and facilitating the arc to fully enter the grid sheet group to improve the arc voltage to realize the rapid extinguishing of the arc, thereby improving the arc extinguishing performance of the arc extinguishing chamber. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the explosion schematic view of the arc extinguishing chamber of the utility model;

[0017] Figure 2 It is the structure schematic view of the orifice plate of the utility model;

[0018] Figure 3 It is a structure schematic view of the arc extinguishing chamber inside the utility model;

[0019] Figure 4 It is another structure schematic view of the arc extinguishing chamber inside the utility model.

[0020] In the drawing: 1. side plate, 2. grid sheet, 21. first grid sheet group, 22. second grid sheet group, 23. third grid sheet group, 3. orifice plate, 31. side hole row, 32. middle hole row, 321. first air hole, 322. second air hole, 4. flame arrester, 5. support, 6. gasket, 7. arc extinguishing cover, 8. gas generator, 100. dynamic arc initiation sheet. DETAILED DESCRIPTION

[0021] The utility model will be described in detail in combination with the specific embodiment of the utility model, but the description of the embodiment is not the limitation of the technical scheme, and any form but not the substantial change according to the utility model concept should be regarded as the protection scope of the utility model.

[0022] In the following description, the directional (or directional) concept of up, down, left, right, front and back is for the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as the special limitation of the technical scheme provided by the utility model.

[0023] As Figure 1 , it is the explosion schematic view of the arc extinguishing chamber. The arc extinguishing chamber includes a pair of side plates 1, the grid sheet 2 arrayed between the pair of side plates 1, and the grid sheet 2 is a plurality of, and is arranged at intervals.

[0024] On the gas outlet side of the grid sheet 2, a perforated plate 3 is cooperatively installed. The perforated plate 3 is made of insulating material, and multiple air holes are provided on the perforated plate 3. The air holes facilitate the passage of air flow. Above the perforated plate 3, a flame extinguishing member 4 is provided. The flame extinguishing member 4 is used to deionize the gas passing through the perforated plate 3.

[0025] The arc extinguishing chamber includes a bracket 5. The bracket 5 is in a square frame shape, and its outer side is cooperatively installed with a pair of side plates 1. Specifically, a convex platform is provided on the outer surface of the bracket 5 that cooperates with the side plate 1. Correspondingly, a positioning hole is provided on the side plate 1. The convex platform is snapped into the positioning hole to achieve the cooperative installation of the two.

[0026] The above-mentioned perforated plate 3 and flame extinguishing member 4 are both located in the inner cavity of the bracket 5. Above the bracket 5, an arc extinguishing cover 7 is further provided. A gasket 6 is provided between the bracket 5 and the arc extinguishing cover 7. The gasket 6 can improve the airtightness between the bracket 5 and the arc extinguishing cover 7.

[0027] Such as Figure 2 、 Figure 3 。 The arc extinguishing chamber further includes a gas generating member 8. The gas generating member 8 covers the grid legs of multiple grid sheets 2. After the arc enters the arc extinguishing chamber, it can burn the gas generating member 8. The gas generating member 8 generates insulating gas to help extinguish the arc.

[0028] Continue to see Figure 2 The perforated plate 3 is a plate made of insulating material, and multiple ventilation holes are opened thereon. Preferably, the ventilation holes are arranged in a square array, or in other words, the ventilation holes are evenly distributed.

[0029] In the width direction of multiple grid sheets 2, the ventilation holes include side hole columns 31 located on both sides and a middle hole column 32 located between the two side hole columns 31. Or it can be said that in the width direction of multiple grid sheets 2, the side hole columns 31 are located on the two outer sides of the middle hole column 32.

[0030] Of course, there may be differences in the lengths of the above-mentioned side hole columns 31 and middle hole column 32. For example, the arrangement length of the side hole column 31 is less than the arrangement length of the middle hole column 32. That is, under the condition of uniform distribution, the number of the middle hole column 32 is greater than the number of the side hole columns 31.

[0031] The ratio of the aperture D of the ventilation holes in the middle hole column 32 to the aperture d of the ventilation holes in the side hole column 31 is 1 < D / d < 3. This setting makes the middle part corresponding to the middle hole column 32 have greater gas fluidity in the width direction of the grid sheet 2, which can make the arc gas concentrate towards the middle, facilitating the arc to enter the grid faster, thereby shortening the survival time of the arc and improving the arc extinguishing performance of the arc extinguishing chamber.

[0032] The switch further comprises a contact system matched with the arc extinguishing chamber, the contact system comprises a moving contact and a static contact, the static contact is fixedly installed, and the moving contact is rotatably arranged, and the moving contact is in contact or separated from the static contact after rotation. For further improvement of the scheme, all the grid fins 2 are arranged to form a first grid fin group 21, a second grid fin group 22 and a third grid fin group 23. The first grid fin group 21 is located on the side of the moving contact, and the third grid fin group 23 is located on the side of the static contact. The second grid fin group 22 is located between the first grid fin group 21 and the third grid fin group 23.

[0033] In combination Figure 3 And Figure 4 In the embodiment, the grid fin gap in the first grid fin group 21 is greater than the grid fin gap in the second grid fin group 22, and the grid fin gap in the third grid fin group 23 is also greater than the grid fin gap in the second grid fin group 22. Preferably, the grid fin gap in the first grid fin group 21 is equal to the grid fin gap in the third grid fin group 23. In the embodiment, the first grid fin group 21 is a short grid fin, and the second grid fin group 22 and the third grid fin group 23 are long grid fins. More specifically, the grid fin gap between the adjacent grid fins 2 of the first grid fin group 21 and the second grid fin group 22 is equal to the grid fin gap between the first grid fin group 21, and the grid fin gap between the adjacent grid fins 2 of the second grid fin group 22 and the third grid fin group 23 is equal to the grid fin gap between the third grid fin group 23.

[0034] Continued to see Figure 2 , Figure 3 The intermediate hole column 32 comprises a first ventilation hole 321 and a second ventilation hole 322. The ratio of the hole diameter d2 of the second ventilation hole 322 to the hole diameter d1 of the first ventilation hole 321 is 1 < d2 / d1 < 2. In at least part of the column in the array direction of the grid fins 2, the first ventilation hole 321 and the second ventilation hole 322 are arranged at intervals after forming a rectangular array. More specifically, in the middle of the intermediate hole column 32, the array of the second ventilation hole 322 is located at both ends of the array of the first ventilation hole 321, or the array of the first ventilation hole 321 is located between the two arrays of the second ventilation hole 322.

[0035] The array of the first ventilation hole 321 corresponds to the second grid fin group 22 described above, and the array of the second ventilation hole 322 corresponds to the first grid fin group 21 and the third grid fin group 23.

[0036] This arrangement makes the first and third groups of vanes 21 and 23 have larger gas passing area, which is beneficial to the arc to enter the vanes quickly, thus accelerating the arc to spread in the whole array of vanes 2.

[0037] Continued to see Figure 4 The arc extinguishing chamber further comprises a moving arc striking vane 100, one end of which is located outside the first group of vanes 21 and extends around the first group of vanes 21 and to the middle of the arc extinguishing chamber after being bent.

Claims

1. An arc-extinguishing chamber for a switch, comprising a pair of side plates (1), an array of multiple grid plates (2) arranged between the pair of side plates (1), and a perforated plate (3) fitted on the outlet side of the multiple grid plates (2), wherein the perforated plate (3) is provided with multiple outlet holes, characterized in that: The vent holes include edge hole rows (31) at both sides, and a middle hole row (32) between the two edge hole rows (31), wherein the ratio of the hole diameter D of the vent holes in the middle hole row (32) to the hole diameter d of the vent holes in the edge hole rows (31) is 1<D / d<3.

2. A switch arc chamber according to claim 1, characterised in that: The switch further comprises a contact system, which includes a moving contact and a stationary contact, and a plurality of arrayed grid plates (2) form a first grid plate group (21), a second grid plate group (22) and a third grid plate group (23), the first grid plate group (21) is located at the side of the moving contact, the third grid plate group (23) is located at the side of the stationary contact, and the second grid plate group (22) is located between the first grid plate group (21) and the third grid plate group (23).

3. A switch arc chamber according to claim 2, characterised in that: The grid plate gap in the first grid plate group (21) is greater than the grid plate gap in the second grid plate group (22), and the grid plate gap in the third grid plate group (23) is also greater than the grid plate gap in the second grid plate group (22).

4. A switch arc chamber according to claim 2, characterised in that: The first grid plate group (21) is a short grid plate, and the second grid plate group (22) and the third grid plate group (23) are long grid plates.

5. A switch arc chamber according to claim 3, characterised in that: The middle hole row (32) includes first vent holes (321) and second vent holes (322), wherein the ratio of the hole diameter d2 of the second vent holes (322) to the hole diameter d1 of the first vent holes (321) is 1<d2 / d1<2, and in at least some columns in the array direction of the plurality of grid plates (2), the first vent holes (321) and the second vent holes (322) are arranged at intervals after forming an array; the array of the first vent holes (321) corresponds to the second grid plate group (22) described above, and the array of the second vent holes (322) corresponds to the first grid plate group (21) and the third grid plate group (23) described above.

6. A switch arc chamber according to claim 5, characterised in that: In the middle part of the middle hole row (32), the array of the second vent holes (322) is located at both ends of the array of the first vent holes (321).

7. A switch arc chamber according to claim 3, characterized in that: The grid plate gap between adjacent grid plates of the first grid plate group (21) and the second grid plate group (22) is equal to the grid plate gap between the first grid plate group (21), and the grid plate gap between adjacent grid plates of the second grid plate group (22) and the third grid plate group (23) is equal to the grid plate gap between the third grid plate group (23).

8. A switch arc chamber according to claim 1, characterized in that: The arc extinguishing chamber further comprises a bracket (5), which is in the shape of a square box, and a flame extinguishing element (4) is arranged above the aperture plate (3), and the aperture plate (3) and the flame extinguishing element (4) are both located in the inner cavity of the bracket (5).

9. A switch arc chamber according to claim 1, characterized in that: The arc extinguishing chamber further comprises a gas generating element (8), which covers the grid plate legs of the plurality of grid plates (2).

10. A switch arc chamber according to claim 2, characterized in that: The arc extinguishing chamber further comprises a moving arc striking plate (100), one end of which is located outside the first grid plate group (21) and is bent to surround the first grid plate group (21) and extend to the middle part of the arc extinguishing chamber.

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