Contact arc extinguishing system of switch

Abstract

A contact arc extinguishing system of a switch belongs to the technical field of switches. Comprising a moving contact, a static contact and an arc extinguish chamber, the moving contact comprises a short contact piece and a long contact piece, grid pieces are arranged in the arc extinguish chamber in an array mode, the arc extinguish chamber is provided with an arc channel, the arc extinguish chamber is characterized by further comprising a labyrinth structure, the long contact piece is provided with a zigzag part, the zigzag part is coupled with the labyrinth structure, and a first moving contact of the short contact piece is located below the labyrinth structure. The second movable contact of the long contact piece is located above the labyrinth structure, and the labyrinth structure limits the arc gas above the labyrinth structure from being sprayed back to the lower portion of the labyrinth structure. The moving contact has the advantages that the arc gas has larger upward moving airflow, the upward movement of the arc is facilitated, and the effect can be ensured to be continuous all the time in the whole opening process of the moving contact; arc gas is prevented from impacting the moving contact, and lower breakdown is effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of switches, and particularly relates to an arc extinguishing system for the contact of a switch. Background Art

[0002] When the moving and static contacts in the switch are separated, an arc will be generated. If the arc is not quickly extinguished, it may cause safety accidents. Therefore, a reliable contact arc extinguishing structure needs to be configured in the switch to quickly extinguish the arc, so as to protect the load.

[0003] For high-current switches, the contact system usually adopts the method of using a contact mechanism with multiple contact pieces. To improve the breaking capacity, at least one arc contact piece is usually set. On the one hand, the arc contact point separates later than other moving contacts, so that it can be ensured that only the arc contact has an arc when breaking the current, and no arc is generated at other moving contacts. On the other hand, the arc contact is extended into the arc extinguishing chamber with a narrow slit, and while stretching the arc, the arc is squeezed by the narrow slit effect and the gas-producing material is burned to extinguish the arc. However, with the increase of the breaking capacity, some high-temperature free gas overflows backward from the narrow slit, resulting in an arc between adjacent moving and static contacts, thus affecting the breaking capacity of the switch.

[0004] In view of the above existing technology, it is necessary to reasonably improve the structure of the contact arc extinguishing system of the existing switch. For this reason, the applicant has made a beneficial design, and the technical solution to be introduced below is generated under this background. Summary of the Utility Model

[0005] The task of the utility model is to provide an arc extinguishing system for the contact of a switch, which restricts the backspray of the arc gas generated above the maze structure by arranging a zigzag part on the long contact piece and coupling the maze structure.

[0006] The task of the utility model is completed as follows. An arc extinguishing system for the contact of a switch includes a moving contact, a static contact and an arc extinguishing chamber. The moving contact includes a short contact piece and a long contact piece. The arc extinguishing chamber is provided with grid pieces in an array and has an arc channel. It also includes a maze structure. The long contact piece is provided with a zigzag part, and the zigzag part is coupled with the maze structure. The first moving contact of the short contact piece is located below the maze structure, and the second moving contact of the long contact piece is located above the maze structure. The maze structure restricts the backspray of the arc gas above it to below it.

[0007] In a specific embodiment of the utility model, the zigzag part is formed by the long contact piece protruding towards at least one side.

[0008] In another specific embodiment of the present utility model, the zigzag portion protrudes from the long contact piece to one side and is in the shape of "]"; the labyrinth structure includes a male mating portion and a female mating portion, and the male mating portion and the female mating portion are staggeredly arranged corresponding to each other.

[0009] In yet another specific embodiment of the present utility model, the arc extinguishing chamber further includes a pair of side walls, the grid plate array is between the pair of side walls, the grid plate includes a pair of grid legs extending towards the moving contact, and a pair of gas generating members are arranged inside the pair of grid legs, and the pair of gas generating members are spaced apart from each other.

[0010] In still another specific embodiment of the present utility model, the labyrinth structure is integrally provided with the side wall.

[0011] In still another specific embodiment of the present utility model, the labyrinth structure is installed on the housing of the switch between the moving contact and the arc extinguishing chamber.

[0012] In a further specific embodiment of the present utility model, the labyrinth structure is arc-shaped to correspond to the movement track of the zigzag portion.

[0013] In an even further specific embodiment of the present utility model, the male mating portion is flat, and the extending end of the female mating portion has a staggering portion, and after the staggering portion is staggered with the head of the male mating portion, a setting staggered with the head is formed, and the head of the male mating portion is directly below the second moving contact.

[0014] In yet a further specific embodiment of the present utility model, it further includes a pair of spacer plates, the pair of spacer plates are located on both sides of the long contact piece, and the spacer plates separate the short contact piece from the long contact piece.

[0015] In an even yet further specific embodiment of the present utility model, the spacer plates are installed on the lower edge of the labyrinth structure.

[0016] Due to the adoption of the above structure, the present utility model has the beneficial effects: by arranging the zigzag portion on the long contact piece and coupling the labyrinth structure, the second moving contact on the long contact piece and the first moving contact on the short contact piece are isolated on both sides inside and outside the arc extinguishing chamber, thereby restricting the backspray of the arc gas generated above the labyrinth structure to below the labyrinth structure, enabling the arc gas to have a greater upward airflow, facilitating the upward movement of the arc, and ensuring that this effect can last throughout the entire opening process of the moving contact; preventing the arc gas from impacting the moving contact and effectively preventing breakdown below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the contact and the arc extinguishing chamber of the present utility model;

[0018] Figure 2 Structural schematic diagram of the first embodiment of the arc extinguishing chamber of the present utility model;

[0019] Figure 3 Structural schematic diagram of the moving contact of the present utility model;

[0020] Figure 4 Structural schematic diagram of the second embodiment of the arc extinguishing chamber of the present utility model;

[0021] Figure 5 Structural schematic diagram of the cooperation between the moving contact and the arc extinguishing chamber of the present utility model;

[0022] Figure 6 Partial structural schematic diagram of the cooperation between the moving contact and the arc extinguishing chamber of the present utility model.

[0023] In the figure: 1. Arc extinguishing chamber, 11. Grid plate, 12. Side wall, 13. Labyrinth structure, 131. Male mating part, 1311. Head, 132. Female mating part, 1321. Staggered part, 14. Gas generating part, 15. Deionization component; 15. Spacer; 2. Moving contact, 21. Moving contact support, 22. Moving contact piece, 221. Short contact piece, 2211. First moving contact point, 222. Long contact piece, 2221. Zigzag part, 22211. First horizontal part, 22212. Second horizontal part, 22213. Vertical part, 2222. Second moving contact point; 100. Spacer. Detailed description of the specific implementation mode

[0024] The following combines the accompanying drawings to describe in detail the specific implementation mode of the present utility model. However, the description of the embodiment is not a limitation of the technical solution. Any change in form rather than substance based on the concept of the present utility model should be regarded as the protection scope of the present utility model.

[0025] In the following description, all concepts related to directions (or orientations) such as up, down, left, right, front, and back are with respect to the position state of the figure being described, aiming to facilitate public understanding. Therefore, they cannot be understood as special limitations on the technical solution provided by the present utility model.

[0026] As Figure 1 , generally, the switch includes a contact system and an arc extinguishing chamber 1 in the opening direction of the contact system. The contact system includes a moving contact 2 and a static contact. Driven by the operating mechanism inside the switch, the moving contact 2 and the static contact are brought into contact or separated, thereby realizing the on or off of the switch.

[0027] As Figure 2, the arc extinguishing chamber 1 includes an array of grid plates 11. There are multiple grid plates 11, which are arranged parallel to each other at intervals to form a grid plate group. Specifically, the grid plate 11 includes a cutting area and grid plate legs extending from both ends of the cutting area towards the contact. When an arc is generated, a pair of grid plate legs has a magnetic blowing effect, which can draw the arc into the cutting area.

[0028] The arc extinguishing chamber 1 further includes a pair of side walls 12. After the pair of side walls 12 are spliced together, they form the outer shell of the arc extinguishing chamber 1. The grid plates 11 are arrayed between the pair of side walls 12. A pair of gas generating parts 14 are provided inside the pair of grid plate legs. The pair of gas generating parts 14 are arranged at intervals to form an arc channel.

[0029] A labyrinth structure 13 is provided below the arc extinguishing chamber 1. The labyrinth structure 13 can partially block the opening of the arc channel, thereby restricting the arc gas from entering the moving contact 2 downward from the arc channel. The labyrinth structure 13 includes a male mating part 131 and a female mating part 132. The male mating part 131 and the female mating part 132 are staggered corresponding to each other to form a bent air duct, or form a labyrinth air duct.

[0030] In this embodiment, the labyrinth structure 13 is integrally provided with the side wall 12. Of course, it can also be separately provided and then the two are installed together by a fixing method.

[0031] A deionization component 15 is provided on the air outlet side of the arc extinguishing chamber 1 close to the grid plates 11. In this embodiment, the deionization component 15 is an orifice plate. Of course, it can also include other deionization parts such as a metal mesh plate.

[0032] As Figure 3 , it is a schematic structural diagram of the moving contact 2. The moving contact 2 includes a moving contact support 21 and a moving contact piece 22. The moving contact piece 22 is rotatably arranged on the contact support 21, that is, the two can rotate relative to each other. Specifically, the moving contact piece 22 includes a short contact piece 221 and a long contact piece 222. Preferably, the long contact piece 222 is centered, that is, the short contact piece 221 is located on both sides of the long contact piece 222. The length of the long contact piece 222 is greater than the length of the short contact piece 221. More specifically, the extending length of the long contact piece 222 is greater than the extending length of the short contact piece 221.

[0033] The long contact piece 222 has a zigzag portion 2221 protruding laterally. The zigzag portion 2221 is coupled to the labyrinth structure 13. In this embodiment, the zigzag portion 2221 is in the shape of "]". Of course, in this embodiment, it protrudes to the right. If it protrudes to the left, it forms "[", and if it protrudes to both sides at the same time, it forms a "mouth" shape and extends upward after confluence.

[0034] Further, the shape of the zigzag portion 2221 may be square or a similar shape, such as semi-circular, polygonal, etc. Also, it belongs to the scope of protection of the present invention to form a multi-layer maze shape by integrating multiple zigzag portions together.

[0035] As a preferred solution, the zigzag portion 2221 is in the shape of "]" and includes a first horizontal portion 22211, a second horizontal portion 22212, and a vertical portion 22213. The vertical portion 22213 is parallel to the long contact piece 222 body, and one end of the first horizontal portion 22211 and the second horizontal portion 22212 is connected to one end of the vertical portion 22213, and the other end is connected to the long contact piece 222 body. The first horizontal portion 22211, the vertical portion 22213, and the second horizontal portion 22212 are connected end to end.

[0036] As Figure 4 , for the second embodiment, the difference from the first embodiment is that the maze structure 13 is not located on the arc extinguishing chamber 1, but is installed between the moving contact 2 and the arc extinguishing chamber 1, for example, inside the housing of the switch, such as on the base and / or bottom plate of the switch.

[0037] As Figure 5 , it is a schematic diagram of the internal structure of the cooperation between the moving contact 2 and the arc extinguishing chamber 1. It further includes a spacer 100. The spacer 100 separates the short contact piece 221 from the long contact piece 222, that is, a pair of spacers 100 are located on both sides of the long contact piece 222. The spacer 100 can prevent a small amount of arc gas passing through the maze structure 13 from contacting the short contact piece 221 and prevent an arc from being generated again on the short contact piece 221.

[0038] For the spacer 100, it can be installed at the lower edge of the maze structure 13, or on the moving contact 2 and the static contact. Preferably, it is installed on the maze structure 13. And the spacer 100 can cooperate with the contact support 21 to improve the isolation between the short contact piece 221 and the long contact piece 22.

[0039] As Figure 6, which is a partial structural schematic diagram of the moving contact cooperating with the arc extinguishing chamber. A first moving contact 2211 is provided at the rotating end of the short contact piece 221, and a second moving contact 2222 is provided at the rotating end of the long contact piece 222. The second moving contact 2222 is located inside the arc channel, and the first moving contact 2211 follows the short contact piece 221 and is located outside the arc extinguishing chamber 1. In the vertical direction, the labyrinth structure 13 is arranged between the first moving contact 2211 and the second moving contact 2222. The first moving contact 2211 of the short contact piece 221 is located below the labyrinth structure 13, and the second moving contact 2222 of the long contact piece 222 is located above the labyrinth structure 13. The labyrinth structure 13 restricts the backspray of the arc gas above it to below it.

[0040] Since the moving contact 2 is rotatably arranged, that is, it realizes the contact cooperation with the static contact after rotation. Therefore, the movement trajectories of the short contact piece 221 and the long contact piece 222 on the moving contact 2 are arc-shaped. Based on this, in order to make the bending part 2221 better cooperate with the labyrinth structure 13, the cooperation dimensions of the two should be preset. For example, considering the deviation caused by rotation, the dimension of D1 ( Figure 6 as shown) can be adjusted to prevent the two from getting stuck and meet the requirement of smooth rotation of the long contact piece 222.

[0041] Preferably, the labyrinth structure 13 is also arc-shaped on the opening trajectory of the moving contact 2 to cooperate with the arc-shaped movement trajectory of the bending part 2221. That is, the labyrinth structure 13 is arc-shaped to correspond to the movement trajectory of the bending part 2221. In this way, there is no need to adjust the dimension such as D1, making the labyrinth structure 13 have better characteristics of restricting the downward movement of the arc gas.

[0042] Continue to see Figure 6 , specifically, the male mating part 131 is flat, and the extended end of the female mating part 132 has a staggering part 1321. The staggering part 1321 is staggered with the head 1311 of the male mating part 131 to form a staggered setting with the head 1311.

[0043] The spacer 100 close to the male mating part 131 is in contact and cooperation with the male mating part 131. Here, the contact and cooperation includes the two being fixed, the two abutting, or corresponding with a small gap.

[0044] Similarly, the spacer 100 close to the female mating part 132 is in contact and cooperation with the female mating part 132. Preferably, the spacer 100 is in contact and cooperation with the staggering part 1321. Here, the contact and cooperation includes the two being fixed, the two abutting, or corresponding with a small gap.

[0045] The advantages of the present utility model are as follows: The maze structure 13 is arranged at the opening of the arc channel and has a relatively short distance from the second moving contact 2222. When an arc is generated between the second moving contact 2222 and the static arc contact corresponding on the static contact, the space below the arc gas is compressed to a large extent. Moreover, the head 1311 of the male mating part 131 is directly opposite to the lower part of the second moving contact 2222, so that the arc gas has a greater upward airflow, which is conducive to the upward movement of the arc. And it can ensure that this effect can continue throughout the opening process of the moving contact 2.

[0046] Due to the adoption of the maze structure 13, the downward air outlet of the arc gas is much smaller than the opening of the arc channel. And due to the bent air channels of the maze structure 13, the amount and flow rate of the gas entering the lower part are effectively reduced, preventing the arc gas from impacting the moving contact and effectively preventing breakdown from below.

[0047] In this structure, the maze structure 13 does not have moving parts such as sliding parts, which can effectively improve the structural stability in a high-temperature environment. Moreover, the male mating part 131 and the female mating part 132 can be made of thermosetting materials, such as DMC and BMC, which have higher burn resistance characteristics compared with the gas-producing thin plates, so the structure has a higher electrical life.

Claims

1. A contact arc extinguishing system for a switch, comprising a moving contact (2), a static contact, and an arc extinguishing chamber (1). The moving contact (2) includes a short contact piece (221) and a long contact piece (222). The arc extinguishing chamber (1) is internally provided with grid pieces (11) arranged in an array and has an arc passage. It is characterized in that: It further includes a labyrinth structure (13). A zigzag portion (2221) is provided on the long contact piece (222). The zigzag portion (2221) is coupled to the labyrinth structure (13). The first moving contact point (2211) of the short contact piece (221) is located below the labyrinth structure (13), while the second moving contact point (2222) of the long contact piece (222) is located above the labyrinth structure (13). The labyrinth structure (13) restricts the arc gas above it from spraying back downward.

2. The arc extinguishing system for the contact of a switch according to claim 1, characterized in that: The zigzag portion (2221) is formed by the long contact piece (222) protruding toward at least one side.

3. The contact arc extinguishing system of a switch according to claim 2, characterized in that: The zigzag portion (2221) protrudes from the long contact piece (222) toward one side and is in the shape of "]”. The labyrinth structure (13) includes a male mating portion (131) and a female mating portion (132). The male mating portion (131) and the female mating portion (132) are staggeredly arranged corresponding to each other.

4. The arc extinguishing system for the contact of a switch according to claim 1, characterized in that: The arc extinguishing chamber (1) further includes a pair of side walls (12). The grid pieces (11) are arrayed between the pair of side walls (12). The grid pieces (11) include a pair of grid piece legs extending toward the moving contact (2). A pair of gas generating members (14) are provided inside the pair of grid piece legs, and the pair of gas generating members (14) are spaced apart from each other.

5. The arc extinguishing system for the contact of a switch according to claim 4, characterized in that: The labyrinth structure (13) is integrally provided with the side wall (12).

6. The arc extinguishing system for the contact of a switch according to claim 4, characterized in that: The labyrinth structure (13) is installed on the housing of the switch between the moving contact (2) and the arc extinguishing chamber (1).

7. The arc extinguishing system for the contact of a switch according to claim 1, characterized in that: The labyrinth structure (13) is in an arc shape to correspond to the movement track of the zigzag portion (2221).

8. The arc extinguishing system for the contact of a switch according to claim 3, characterized in that: The male mating portion (131) is in a flat plate shape, and the extended end of the female mating portion (132) has a staggered portion (1321). After the staggered portion (1321) is staggered from the head (1311) of the male mating portion (131), it forms a setting staggered from the head (1311). The head (1311) of the male mating portion (131) is directly below the second moving contact point (2222).

9. The arc extinguishing system for the contact of a switch according to claim 1, characterized in that: It further includes a pair of spacer plates (100). The pair of spacer plates (100) are located on both sides of the long contact piece (222). The spacer plates (100) separate the short contact piece (221) from the long contact piece (222).

10. The arc extinguishing system for the contact of a switch according to claim 9, characterized in that: The spacer plates (100) are installed on the lower edge of the labyrinth structure (13).

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