Arc extinguishing system of switch

Abstract

An arc extinguishing system of a switch belongs to the technical field of switches. The switch comprises a shell, a contact system and an arc extinguish chamber, the contact system and the arc extinguish chamber are arranged in the shell, the contact system comprises a static contact and a moving contact, the arc extinguish chamber comprises a first grid sheet group, a second grid sheet group, a middle arc striking sheet and an insulation spacing board, and the insulation spacing board is arranged in the arc extinguish chamber and extends from the contact system to the interior of the arc extinguish chamber. The inner space of the arc extinguish chamber is divided into at least two spaced inner cavities, the first grid piece set and the second grid piece set are located on the two sides of the insulating partition plate and arranged in the extending direction of the insulating partition plate, the first grid piece set and the second grid piece set are connected in series through the middle arc striking piece, and an arc striking head of the middle arc striking piece is located at an arc inlet of the arc extinguish chamber. The grid plate group has the advantages that the speed of an electric arc entering the grid plate group is increased while the stacking number of the grid plates is increased, the arc voltage is effectively improved, the requirement of extinguishing higher voltage can be met, and the high-voltage application scene is met.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically relating to an arc extinguishing system for a switch. Background Technology

[0002] Switches are crucial electrical appliances in power supply and distribution lines. They interrupt the current carrying the circuit, protecting the lines and electrical equipment. A switch typically includes a contact system, which consists of moving and stationary contacts. When the moving contact actuates, it contacts or separates from the stationary contact, thus enabling the switch to conduct or disconnect. As is known in the industry, when a switch breaks, an electric arc is generated between the moving and stationary contacts. Due to the relatively large energy of the arc, breaking the switch becomes extremely difficult. Therefore, switches usually include an arc-extinguishing chamber to extinguish the arc generated when the moving and stationary contacts separate. Only when the arc is extinguished is the circuit broken. The role of the arc-extinguishing chamber in ensuring the safe operation of electrical equipment is undeniable.

[0003] With the development of new energy sources, high-voltage applications are becoming increasingly common. To meet market demands, switches themselves need to meet higher voltage requirements. As the functional component in a switch designed to extinguish electric arcs, the arc-extinguishing chamber also needs to extinguish even higher voltages. To extinguish higher-voltage arcs, the arc-extinguishing chamber needs to increase the arc voltage to a higher level when the arc enters the grid assembly within the chamber. Therefore, it is imperative to increase the number of stacked grids to effectively increase the arc voltage and thus extinguish the arc.

[0004] Therefore, those skilled in the art have been seeking technical solutions to increase the number of stacked gates, and the technical solution to be introduced below is a product of this background. Utility Model Content

[0005] The purpose of this invention is to provide an arc extinguishing system for a switch. An insulating partition plate is provided inside the arc extinguishing chamber housing to divide the internal space. Two sets of grid plates are arranged on both sides of the partition plate along the extension direction of the partition plate. The two sets of grid plates are connected in series through an intermediate arc-inducing plate. The arc-inducing head of the intermediate arc-inducing plate is located at the arc inlet of the arc extinguishing chamber, thereby increasing the number of stacked grid plates while accelerating the speed at which the electric arc enters the grid plate group.

[0006] The purpose of this utility model is achieved as follows: an arc-extinguishing system for a switch, the switch including a housing, a contact system and an arc-extinguishing chamber disposed inside the housing, the contact system including a stationary contact and a moving contact, the arc-extinguishing chamber including a first grid plate group, a second grid plate group, an intermediate arc-inducing plate and an insulating spacer, the insulating spacer being disposed inside the arc-extinguishing chamber and extending from the contact system into the interior of the arc-extinguishing chamber, dividing the interior space of the arc-extinguishing chamber into two spaced internal cavities, the first grid plate group and the second grid plate group being located on both sides of the insulating spacer and arranged along the extending direction of the insulating spacer, the intermediate arc-inducing plate connecting the first grid plate group and the second grid plate group in series, the arc-inducing head of the intermediate arc-inducing plate being located at the arc inlet of the arc-extinguishing chamber.

[0007] In a specific embodiment of this utility model, the arc-extinguishing chamber includes an arc-extinguishing chamber shell, the arc-extinguishing chamber shell includes a first wall located on the side of the moving contact and a second wall located on the side of the stationary contact; the arc-extinguishing chamber shell also includes a pair of side walls connecting the first wall and the second wall from both sides and a top wall disposed at one end away from the contact system.

[0008] In another specific embodiment of this utility model, the top wall has two sets of vent holes, one set of vent holes cooperating with the first grid plate group, and the other set of vent holes cooperating with the second grid plate group.

[0009] In another specific embodiment of this utility model, the intermediate arc-starting plate is formed by spanning the opening side of the internal cavity of the adjacent arc-extinguishing chamber.

[0010] In another specific embodiment of this utility model, the intermediate arc-initiating piece includes an arc-initiating head and a pair of bent portions, the pair of bent portions extending from both ends of the arc-initiating head toward the insulating spacer.

[0011] In another specific embodiment of this utility model, the arc-starting head is V-shaped, and the protruding part in the middle of the arc-starting head faces the contact system.

[0012] In a further specific embodiment of this utility model, the insulating spacer extends through the top wall and separates the two sets of vent holes.

[0013] In a more specific embodiment of this utility model, the insulating spacer is integrally formed with the arc-extinguishing chamber shell.

[0014] In yet another specific embodiment of the present invention, the first grid group and / or the second grid group are composed of a plurality of grids, each grid including a cutting area and a pair of grid legs, the pair of grid legs extending from both ends of the cutting area to the same side, and an offset arc notch is formed between the pair of grid legs.

[0015] In yet another specific embodiment of this utility model, a pair of gas generating elements are attached to the inner side of the pair of grid legs, and the gap between the pair of gas generating elements is aligned with the opening of the arc notch.

[0016] The beneficial effects of this utility model due to the above-mentioned structure are as follows: by providing an insulating partition plate that divides the internal space inside the arc-extinguishing chamber shell, and setting two sets of grid plate groups on both sides of the partition plate along the extension direction of the partition plate, the two sets of grid plate groups are connected by an intermediate arc-initiating plate. The arc-initiating head of the intermediate arc-initiating plate is located at the arc inlet of the arc-extinguishing chamber, thereby increasing the number of stacked grid plates while accelerating the speed at which the electric arc enters the grid plate group, effectively improving the arc voltage, and thus meeting the requirements for extinguishing higher voltages, which is in line with high-voltage application scenarios. Attached Figure Description

[0017] Figure 1 This is a side view of the switch described in this utility model;

[0018] Figure 2 This is a schematic diagram of the arc-extinguishing chamber described in this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the grid and gas generating component described in this utility model.

[0020] In the figure: 1. Shell, 11. Base, 12. Middle cover, 13. Top cover; 2. Contact system, 21. Stationary contact, 211. Stationary arc-starting plate, 2111. Straight passage, 2112. Second mating part, 22. Moving contact; 3. Arc-extinguishing chamber, 31. First grid plate group, 32. Second grid plate group, 33. Intermediate arc-starting plate, 331. Arc-starting head, 332. Bending part, 34. Insulating spacer, 35. Moving arc-starting plate, 351. V-shaped end, 352. Connecting part, 353. First mating part; 4. Rotating shaft; 100. Arc-extinguishing chamber shell, 101. First wall, 102. Second wall, 103. Side wall, 104. Top wall, 1041. Vent hole; 200. Grid plate, 201. Cutting area, 202. Grid plate leg, 203. Arc-drawing notch; 300. Gas generating component. Detailed Implementation

[0021] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0022] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0023] like Figure 1 This is a schematic diagram of a switch. The switch includes a housing 1, which comprises a base 11, a middle cover 12, and a top cover 13. The base 11 is located at the bottom, the middle cover 12 is located above the base 11, and the top cover 13 is located above the middle cover 12. The three components are stacked on top of each other.

[0024] The switch also includes a contact system 2, an arc-extinguishing chamber 3, and a rotating shaft 4. The contact system 2 includes a moving contact 22 and a stationary contact 21. The moving contact 22 is mounted on the rotating shaft 4, while the stationary contact 21 is mounted on the base 11. The rotating shaft 4 is connected to the switch mechanism; that is, when the mechanism is activated, it pulls the rotating shaft 4 to rotate. The rotation of the rotating shaft 4 causes the moving contact 22 to swing, achieving contact or separation with the stationary contact 21. The arc-extinguishing chamber 3 is located on one side of the contact system 2. When the moving contact 22 separates from the stationary contact 21 and generates an arc, the arc enters the arc-extinguishing chamber 3 and is extinguished within it, thereby cutting off the current.

[0025] After the base 11 and the middle cover 12 are spliced ​​together vertically, a contact arc-extinguishing cavity is formed between them. The contact arc-extinguishing cavity is used to accommodate the contact system 2, the arc-extinguishing chamber 3, and the rotating shaft 4. That is, all three are located in the contact arc-extinguishing cavity and are separated from the mechanism above the middle cover 12.

[0026] See you later Figure 1 The arc-extinguishing chamber 3 includes an arc-extinguishing chamber housing 100, which serves as the outer shell of the arc-extinguishing chamber 3, and other components are installed inside it. The arc-extinguishing chamber 3 also includes a first grid plate group 31, a second grid plate group 32, an intermediate arc-leading plate 33, an insulating spacer 34, and a moving arc-leading plate 35. The stationary contact 21 includes a stationary arc-leading plate 211.

[0027] The insulating spacer 34 is disposed inside the arc-extinguishing chamber 3 and extends from the contact system 2 into the interior of the arc-extinguishing chamber 3, dividing the interior space of the arc-extinguishing chamber 3 into at least two spaced internal cavities, the opening side of which faces the contact system 2.

[0028] A first grid plate group 31 and a second grid plate group 32 are respectively arranged on both sides of the insulating spacer 34. The projections of the first grid plate group 31 and the second grid plate group 32 onto the insulating spacer 34 are both within the range of the insulating spacer 34. The insulating spacer 34 is made of insulating material. The first grid plate group 31 and the second grid plate group 32 are located on both sides of the insulating spacer 34 and are arranged along the extending direction of the insulating spacer 34, that is... Figure 2 The array is set in the top and bottom directions.

[0029] The moving arc-inducing plate 35 corresponds to one side of the moving contact 22, while the stationary arc-inducing plate 211 is fixedly disposed with the stationary contact 21. The moving arc-inducing plate 35 mates with the head of the moving contact 22. More specifically, the moving arc-inducing plate 35 is installed inside the arc-extinguishing chamber 3, while the stationary arc-inducing plate 211 is installed on the stationary contact 21. The intermediate arc-inducing plate 33 is disposed at the arc inlet and connects the first grid plate group 31 and the second grid plate group 32 in series. This series connection means that a conductive component is used to connect the two ends of the two grid plate groups respectively. That is, one end of the conductive component extends to one end of the first grid plate group, and the other end of the conductive component extends to one end of the second grid plate group, so that after the arc enters the first grid plate group and the second grid plate group, the arcs in the first grid plate group and the second grid plate group are in series. Preferably, the intermediate arc-inducing plate 33 is an open rhombus shape, with its two ends mate with the first grid plate group 31 and the second grid plate group 32 respectively.

[0030] One end of the moving arc-inducing plate 35 is located on the side of the moving contact 22 in the open position, and the other end extends into the arc-extinguishing chamber 3 and is located on the outer side of the end of the first grid plate group 31 away from the intermediate arc-inducing plate 33, and is arranged parallel to the end grid plates corresponding to the first grid plate group 31 at intervals.

[0031] After the contact system 2 and the arc-extinguishing chamber 3 are installed, one end of the stationary arc-inducing plate 211 is located on one side of the stationary contact 21, and the other end extends into the arc-extinguishing chamber 3 and is located on the outer side of the end of the second grid plate group 32 away from the intermediate arc-inducing plate 33, and is arranged parallel to the end grid plates corresponding to the second grid plate group 32.

[0032] The intermediate arc-starting plate 33 connects the first grid plate 31 and the second grid plate group 32 in series. Specifically, the intermediate arc-starting plate 33 is formed by spanning the opening side of the internal cavity of the adjacent arc-extinguishing chamber 3.

[0033] like Figure 2 The arc-extinguishing chamber housing 100 includes a first wall 101 corresponding to the side of the moving contact 22 and a second wall 102 corresponding to the side of the stationary contact 21. The first wall 101 and the second wall 102 are spaced apart and opposite to each other. The arc-extinguishing chamber housing 100 also includes a pair of side walls 103 connecting the first wall 101 and the second wall 102 from both sides, and the first wall 101, the second wall 102 and the pair of side walls 103 together form a square frame. A top wall 104 is also provided at the end of the first wall 101, the second wall 102 and the pair of side walls 103 away from the contact system 2, so that the arc-extinguishing chamber housing 100 forms a five-sided frame structure with a hollow interior. The insulating spacer 34 extends in the same direction as the first wall 101. Preferably, the end of the insulating spacer 34 near the top wall 104 is connected to the top wall 104. More preferably, the insulating spacer 34 is integrally formed with the housing 100.

[0034] The top wall 104 has two sets of vent holes 1041, one set of which engages with the first grid plate group 31, while the other set engages with the second grid plate group 32. Arc gas flows through these vent holes 1041 to the outside of the arc-extinguishing chamber 3. Preferably, the insulating spacer 34 extends through the top wall 104 and separates the two sets of vent holes 1041.

[0035] Preferably, the distance between the first grid group 31 and the insulating spacer 34 increases with the distance from the contact system 2. Similarly, preferably, the distance between the second grid group 32 and the insulating spacer 34 increases with the distance from the contact system 2. This arrangement allows for better permeability of the arc gas within the arc-extinguishing chamber 2.

[0036] The movable arc-inducing plate 35 includes a V-shaped end 351, a connecting portion 352, and a first mating end 353. The V-shaped end 351 is located on the opening side of the arc-extinguishing chamber 3, while the first mating end 353 mates with the first grid plate group 31 and is located on one side of the top wall 104. The connecting portion 352 connects the V-shaped end 351 and the first mating end 353.

[0037] The stationary arc-leading plate 211 includes a straight section 2111 and a second mating end 2112. One end of the straight section 2111 is fixed to the stationary contact 21, while the other end of the straight section 2111 is connected to the second mating end 2112. The second mating end 2112 is mated with the second grid plate group 32 and is located on one side of the top wall 104.

[0038] The intermediate arc-starting plate 33 is an open rhombus shape, including an arc-starting head 331 and a pair of bent portions 332. The arc-starting head 331 is V-shaped, with the protruding portion in the middle facing the contact system 2. The pair of bent portions 332 extend from both ends of the arc-starting head 331 toward the insulating spacer 34. Preferably, the pair of bent portions 332 are parallel to the end plates of the first grid plate group 31 and the second grid plate group 32, respectively. Because the intermediate arc-starting plate 33 is located at the arc inlet of the arc-extinguishing chamber 3, it can attract the arc more quickly and accelerate the speed at which the arc enters the first grid plate group 31 and the second grid plate group 32. More specifically, the arc-starting head 331 is located at the arc inlet of the arc-extinguishing chamber 3.

[0039] like Figure 3 The first grid plate group 31 and / or the second grid plate group 32 are composed of multiple grid plates 200. Each grid plate 200 includes a cutting area 201 and a pair of grid plate legs 202, which extend from both ends of the cutting area 201 to the same side. An offset arc-drawing notch 203 is also formed between the pair of grid plate legs 202. When adjacent grid plates 200 are flipped and installed, the arc-drawing notches 203 on them are staggered, which can better draw the arc.

[0040] In a preferred embodiment, a pair of gas-generating elements 300 are also attached to the inner side of the pair of grid legs 202. Specifically, one gas-generating element 300 is attached to the inner side of one of the grid legs 202, and the other gas-generating element 300 is attached to the inner side of the other grid leg. The pair of gas-generating elements 300 are spaced apart to form an arc channel therebetween. More preferably, the gas-generating elements 300 can seal the grid legs 202 to prevent the arc from entering the grid legs 202. Preferably, the gap between the pair of gas-generating elements 300 is aligned with the opening of the arc-drawing notch 203.

[0041] Because a pair of gas generating components 300 are provided, the arc channel inside the arc extinguishing chamber 3 is greatly reduced. The reduction in space allows for a better air blowing effect when the arc gas is subjected to the same air blowing action, which facilitates the arc's spread within the arc extinguishing chamber 2, thereby increasing the speed at which the arc enters the first grid plate group 31 and the second grid plate group 32.

Claims

1. An arc extinguishing system of a switch, the switch comprising a housing (1), a contact system (2) and an arc chamber (3) arranged inside the housing (1), said contact system (2) comprising a stationary contact (21) and a movable contact (22), said arc chamber (3) comprising a first set of vanes (31), a second set of vanes (32), an intermediate arc blade (33) and an insulating partition (34), said insulating partition (34) being arranged inside the arc chamber (3) and extending from said contact system (2) into the interior of said arc chamber (3), dividing the interior space of said arc chamber (3) into two spaced apart interior cavities, characterized in that: The first and second groups of grid plates (31, 32) are located on both sides of the insulating partition plate (34) and are arranged along the extending direction of the insulating partition plate (34), and the intermediate arc leading plate (33) connects the first and second groups of grid plates (31, 32) in series, and the arc leading head (331) of the intermediate arc leading plate (33) is located at the arc inlet of the arc extinguishing chamber (3).

2. An arc quenching system for a switch according to claim 1, characterized in that: The arc extinguishing chamber (3) comprises an arc extinguishing chamber shell (100), the arc extinguishing chamber shell (100) comprises a first wall (101) located on one side of the movable contact (22) and a second wall (102) located on one side of the fixed contact (21), and the arc extinguishing chamber shell (100) further comprises a pair of side walls (103) connecting the first wall (101) and the second wall (102) from both sides and a top wall (104) arranged away from one end of the contact system (2).

3. An arc quenching system for a switch according to claim 2, characterized in that: The top wall (104) is provided with two groups of ventilation holes (1041), one group of ventilation holes (1041) is matched with the first group of grid plates (31), and the other group of ventilation holes (1041) is matched with the second group of grid plates (32).

4. An arc quenching system for a switch according to claim 1, characterized in that: The intermediate arc leading plate (33) spans the opening side of the internal cavity of the adjacent arc extinguishing chamber (3).

5. An arc quenching system for a switch according to claim 4, characterized in that: The intermediate arc leading plate (33) comprises an arc leading head (331) and a pair of bent portions (332), and the pair of bent portions (332) extend from both ends of the arc leading head (331) to the insulating partition plate (34).

6. An arc quenching system for a switch according to claim 5, characterized in that: The arc leading head (331) is V-shaped, and the protruding portion in the middle of the arc leading head (331) faces the contact system (2).

7. An arc quenching system for a switch according to claim 3, characterized in that: The insulating partition plate (34) penetrates the top wall (104) and separates the two groups of ventilation holes (1041).

8. An arc quenching system for a switch according to claim 2, characterized in that: The insulating partition plate (34) is integrally formed with the arc extinguishing chamber shell (100).

9. An arc quenching system for a switch according to claim 1, characterized in that: The first and / or second groups of grid plates (31, 32) are composed of a plurality of grid plates (200), the grid plate (200) comprises a cutting area (201) and a pair of grid legs (202), the pair of grid legs (202) extend to the same side from both ends of the cutting area (201), and a biased arc drawing gap (203) is formed between the pair of grid legs (202).

10. An arc quenching system for a switch according to claim 9, characterized in that: A pair of gas generating members (300) are attached to the inner side of the pair of grid legs (202), and the gap between the pair of gas generating members (300) is aligned with the opening of the arc drawing gap (203).

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