Contact arc extinguishing system of switch

Abstract

A contact arc extinguishing system of a switch belongs to the technical field of switches. Comprising a contact system and an arc extinguish chamber, the arc extinguish chamber comprises a plurality of grid sheets in an array, the contact system comprises a moving contact, a moving contact sheet is arranged on the moving contact, and the moving contact sheet is rotatably arranged on a contact support of the moving contact through a rotating shaft; the arc extinguish chamber comprises at least one spacing board, the spacing board extends from the arc extinguish chamber to the moving contact and is inserted between the moving contact pieces, the moving contact pieces which are coaxially arranged are divided into at least two groups by the spacing board, and the spacing board is provided with a ventilation cavity. The arc extinguish chamber has the advantages that the ventilation cavity is formed in the spacing board of the arc extinguish chamber and facilitates flowing of arc gas, so that arcs can be generated on the two sides of the spacing board, and the difficulty of breaking a circuit of the switch is reduced.

Description

Technical Field

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

[0002] A switch is an electrical device that can carry and interrupt current under normal circuit conditions, and can also carry and interrupt current under abnormal circuit conditions within a specified time.

[0003] In the prior art, there have been technical means such as lengthening the arc by increasing the opening distance and promoting and cooling the arc by burning the gas-producing material. However, problems such as long arcing time, non-burning resistance of the gas-producing material and severe contact erosion may occur, making the switch unable to reliably disconnect the circuit.

[0004] In view of the above-mentioned prior art, it is necessary to reasonably improve the contact arc extinguishing structure of the existing switch. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Utility Model Content

[0005] The task of the utility model is to provide a contact arc extinguishing system for a switch, which improves the arc extinguishing ability by forming narrow gaps by setting up partition plates, and at the same time, a ventilation cavity is opened on the partition plates to facilitate the flow of arc gas, so that arcs can be formed in each narrow gap, thereby improving the breaking reliability.

[0006] The task of the utility model is accomplished in this way. A contact arc extinguishing system of a switch includes a contact system and an arc extinguishing chamber, wherein the arc extinguishing chamber includes a plurality of grid plates in an array, and the contact system includes a moving contact, on which a moving contact piece is arranged, and the moving contact piece is rotatably arranged on a contact support of the moving contact through a rotating shaft; the arc extinguishing chamber includes at least one partition plate, which extends from the arc extinguishing chamber toward the moving contact and is inserted between the moving contact pieces, and the partition plate divides the coaxially arranged moving contact pieces into at least two groups, and a ventilation cavity is arranged on the partition plate.

[0007] In a specific embodiment of the present invention, the arc extinguishing chamber includes a bracket, and the partition plate is arranged on the bracket; the bracket also includes side plate parts, and the side plate parts are located on both sides of the bracket.

[0008] In another specific embodiment of the present invention, the bracket further includes a connecting portion, and the connecting portion connects the partition plate and the side plate portion.

[0009] In another specific embodiment of the utility model, the grid sheet includes a first grid sheet and a second grid sheet, and a first notch is opened on an edge of one side of the first grid sheet close to the contact system, and the number of the first notches corresponds to the number of groups into which the moving contact sheet is divided; the second grid sheet includes a second notch, and the second notch is also located on an edge of one side of the second grid sheet close to the contact system, and a pair of grid sheet legs extending toward the contact system are provided on both sides of the middle second notch, and the heads of the grid sheet legs are located on both sides of the moving contact points of the moving contact sheet.

[0010] In yet another specific embodiment of the present invention, the grid legs are inserted into the spacer plates.

[0011] In another specific embodiment of the present utility model, the ventilation cavity is an open slot with one end open, and the grid leg is inserted into the ventilation cavity.

[0012] In a further specific embodiment of the utility model, the grid also includes a third grid, the third grid is provided with a long grid leg, the length of the long grid leg is greater than the grid leg on the second grid, and the third grid corresponds to the arc entrance of the arc extinguishing chamber.

[0013] In a more specific embodiment of the present invention, a moving contact is provided on the moving contact piece, and the moving contact also has a short contact piece, the short contact piece is opposite to the partition plate, and the moving contact piece is opposite to the cavities on both sides of the partition plate, the length of the short contact piece is smaller than the length of the moving contact piece, a short contact piece moving contact is provided on the short contact piece, the short contact piece moving contact is located outside the arc extinguishing chamber, and the moving contact extends into the interior of the arc extinguishing chamber.

[0014] In yet another specific embodiment of the present invention, the arc extinguishing chamber also includes a pair of fixed plates, a plurality of grid plates are arrayed between the pair of fixed plates, a moving arc-striking plate is provided at one end of the plurality of grid plates in the array close to the moving contact, the moving arc-striking plate is bent toward the inside of the arc extinguishing chamber to form a moving arc-striking plate extension section, the ventilation cavity is hole-shaped, and the ventilation cavity is opened on the partition plate on the side of the moving arc-striking plate close to the contact system.

[0015] In yet another specific embodiment of the present invention, a group of moving contact pieces formed by being divided by the partition plate includes one or two moving contact pieces.

[0016] The utility model has the beneficial effect of adopting the above structure: it forms narrow gaps by setting up partition plates to improve arc extinguishing ability, and at the same time, a ventilation cavity is opened on the partition plate to facilitate the flow of arc gas, so that arcs can be formed in each narrow gap, thereby improving breaking reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the arc extinguishing chamber and the contact system in the first embodiment of the utility model;

[0018] Figure 2 This is a cross-sectional view of the arc extinguishing chamber and the contact system in the first embodiment of the utility model;

[0019] Figure 3 It is a side sectional view of the arc extinguishing chamber and the contact system in the first embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the first grid piece in the first embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the second grid piece in the first embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of a bracket in the first embodiment of the present utility model;

[0023] Figure 7 It is a side sectional view of the arc extinguishing chamber and the contact system in the second embodiment of the utility model;

[0024] Figure 8 A cross-sectional view of an arc extinguishing chamber and a contact system in a second embodiment of the present utility model;

[0025] Fig. 9 It is a cross-sectional view of an arc extinguishing chamber and a contact system in a third embodiment of the present utility model;

[0026] Fig.10 This is a schematic diagram of a bracket in a fourth embodiment of the present utility model;

[0027] Fig.11 It is a cross-sectional view of the arc extinguishing chamber and the contact system in the fourth embodiment of the present utility model.

[0028] In the figure: 1. fixed plate; 2. top bracket; 3. grid plate, 31. first grid plate, 311. first notch, 312. first mounting protrusion, 32. second grid plate, 321. second notch, 322. second mounting protrusion, 323. grid plate leg, 33. third grid plate; 4. moving arc-striking plate, 41. moving arc-striking plate extension; 5. bracket, 51. spacer plate, 511. ventilation cavity, 512. concave cavity, 52. side plate, 521. fixed edge; 100. moving contact plate, 101. moving contact point; 200. static contact conductive block, 201. static contact point, 202. static arc-striking plate; 300. short contact plate, 301. end contact plate moving contact. DETAILED DESCRIPTION

[0029] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0030] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are referring to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solutions provided by the present utility model. Example 1

[0031] like Figure 1 , Figure 2 , Figure 3 Schematic diagram of the contact system and arc extinguishing chamber in the first embodiment. The switch has a contact system and an arc extinguishing chamber. The arc extinguishing chamber is located in the opening direction of the contact system. When the contact system is opened, an arc is generated, and the arc can enter the arc extinguishing chamber and extinguish in the arc extinguishing chamber. When the arc is extinguished, the switch cuts off the current it carries.

[0032] The contact system includes a moving contact and a stationary contact. The moving contact can be connected or disconnected with the stationary contact after being moved. The moving contact includes a plurality of moving contact pieces 100, and the moving contact pieces 100 are rotatably arranged on the contact support of the moving contact through a rotating shaft. A moving contact 101 is arranged on each moving contact piece 100. The stationary contact has a stationary contact conductive block 200, and a stationary contact 201 and a stationary arc-striking piece 202 are installed on the stationary contact conductive block 200. The stationary contact 201 corresponds to and cooperates with the moving contact 101, that is, when the moving contact and the stationary contact are in the connected state, the moving contact 101 contacts the stationary contact 201. The stationary arc-striking piece 202 is installed on the stationary contact conductive block 200 and extends toward the arc extinguishing chamber, and is used to draw the arc to the inside of the arc extinguishing chamber.

[0033] The arc extinguishing chamber includes a fixed plate 1, a top bracket 2 and a grid 3. The fixed plate 1 has a pair, and the grid 3 is a plurality of grids and is arranged in an array between the fixed plates 1. The top bracket 2 is located on the side of the plurality of grids 3 facing the outside of the arc extinguishing chamber. A moving arc-striking piece 4 is provided at one end of the plurality of grids 3 in the array close to the moving contact. The moving arc-striking piece 4 is installed at one end of the plurality of grids 3 in the array and is bent toward the inside of the arc extinguishing chamber to form a moving arc-striking piece extension section 41.

[0034] The arc extinguishing chamber further includes a bracket 5, and the bracket 5 is fixed on the arc extinguishing chamber, specifically fixed on one side of a pair of fixed plates 1. The bracket 5 is usually made of insulating material. The head of the moving contact piece 100 extends into the bracket 5. A partition plate 51 is provided in the bracket 5, and at least one partition plate 51 is inserted between the moving contact pieces 100. The partition plate 51 divides the coaxially arranged moving contact pieces 100 into at least two groups. The partition plate 51 is located in the cavity opposite to the grid piece 3 and the moving contact piece 100. Preferably, a group of moving contact pieces 100 formed by being divided by the partition plate 51 includes one or two moving contact pieces 100.

[0035] See also Figure 6 The bracket 5 further includes a side plate portion 52, which is located on both sides of the bracket 5, so that the side plate portion 52 is located on both sides of the movable contact piece 100. When the movable contact piece 100 is divided by the partition plate 51, the outer side of a group of movable contact pieces 100 located on the two outer sides is the side plate portion 52. A fixed edge 521 is also formed at the end of the side plate portion 52, and the fixed edge 521 is used for the installation between the bracket 5 and the fixed plate 1. The upper end of the movable arc-starting piece 4 is located between a pair of fixed plates 1, and the lower end of the movable arc-starting piece 4, that is, the lower end of the movable arc-starting piece extension section 41, is located between the pair of side plate portions 52.

[0036] The technical key point of the utility model is that a ventilation cavity 511 is provided on the partition plate 51. In this embodiment, the ventilation cavity 511 is a strip groove. When the switch is disconnected, when an arc is generated between the moving contact 101 of any group of the moving contact pieces 100 and the static contact 201, the high-temperature gas generated by the arc can flow through the ventilation cavity 511, so that an arc is formed in the dividing cavity on both sides of the partition plate 51 due to the setting of the partition plate 51, which reduces the difficulty of disconnecting the switch circuit.

[0037] like Figure 4 , Figure 5is a schematic diagram of the grid sheet 3. The grid sheet 3 includes at least two types of grid sheets. The two types of grid sheets 3 include a first grid sheet 31 and a second grid sheet 32. The first grid sheet 31 is made of a metal plate, and the first grid sheet 31 is roughly in the shape of a square frame. A first notch 311 is provided on an edge of one side of the first grid sheet 31 close to the contact system, and the number of the first notches 311 corresponds to the number of groups into which the moving contact sheet 100 is divided. For example, when the moving contact sheet 100 is divided into two groups by a partition plate 51, there are two first notches 311. Preferably, the first notch 311 is triangular, and the edges on both sides of the first notch 311 are straight lines. First mounting protrusions 312 are provided on both sides of the first grid sheet 31, and the first mounting protrusions 312 are inserted into the corresponding fixing plate 1, and the two are fixedly mounted by riveting.

[0038] The second grid sheet 32 ​​also includes a second notch 321 and a second mounting protrusion 322. The second notch 321 is also located on a side edge of the second grid sheet 32 ​​close to the contact system. Its shape is the same as the first notch 311 and will not be described again. Similarly, second mounting protrusions 322 are provided on both sides of the second grid sheet 32. The installation of the second mounting protrusion 322 is the same as the installation of the first mounting protrusion 312 and will not be repeated here.

[0039] The second grid sheet 32 ​​is different from the first grid sheet 31 in that: when the number of the second notches 321 is three, a pair of grid sheet legs 323 extending toward the contact system are provided on both sides of the middle second notch 321. The heads of the grid sheet legs 323 extend and are located on both sides of the moving contact point 101 of the moving contact sheet 100. Thus, the contact system and the second grid sheet 32 ​​are not arranged at intervals, but are arranged in an interlaced manner. When the number of the second notches 321 is two, there is a grid sheet leg 323 between the two second notches 321.

[0040] The grid plate 3 further comprises a third grid plate 33, on which a long grid plate leg is provided, and the length of the long grid plate leg is greater than the grid plate leg 323 on the second grid plate 32. Preferably, the third grid plate 33 corresponds to the arc entrance of the arc extinguishing chamber.

[0041] like Figure 6 , is a schematic diagram of the bracket 5. The bracket 5 also includes a connecting portion, and the connecting portion connects the partition plate 51 and the side plate portion 52. Therefore, the bracket 5 can be provided as an integral unit. At the position of the bracket 5 corresponding to the movable arc-striking piece 4, a concave cavity 512 is provided on the partition plate 51. The shape of the concave cavity 512 matches the shape of the movable arc-striking piece 4.

[0042] In this embodiment, the grid leg 323 is inserted into the partition plate 51. Accordingly, the partition plate 51 is provided with a receiving cavity for inserting the grid leg 323. Preferably, in this embodiment, the ventilation cavity 511 is an open slot with one end open. Example 2

[0043] like Figure 7 , Figure 8 is a schematic diagram of the second embodiment. The difference between the second embodiment and the first embodiment is that the grid leg 323 is located in the ventilation cavity 511. Since the grid leg 323 follows the second grid 32, and the adjacent second grid 32 is arranged at intervals, the grid leg 323 of the adjacent second grid 32 is also arranged at intervals. Therefore, the grid leg 323 is located in the ventilation cavity 511 and cannot isolate the flow of gas in the cavity on both sides of the partition plate 51. That is, at this time, the ventilation cavity 511 can also achieve the flow of gas on both sides thereof. Example 3

[0044] like Fig. 9 Schematic diagram of the third embodiment. The difference between the third embodiment and the second embodiment is that the moving contact includes not only the moving contact piece 100, but also a short contact piece 300, and the short contact piece 300 and the moving contact piece 100 are arranged in a group and alternately. Fig. 9 , each group of short contact pieces 300 is located between two groups of moving contact pieces 100. The short contact pieces 300 are opposite to the partition plate 51, while the moving contact pieces 100 are opposite to the cavities on both sides of the partition plate 51. The length of the short contact pieces 300 is smaller than that of the moving contact pieces 100, and the short contact pieces 300 and the moving contact pieces 100 are pin-connected to the contact support of the contact system through the same rotating shaft. The head of the short contact piece 300 is farther away from the arc extinguishing chamber than the head of the moving contact piece 100. More specifically, the short contact piece 300 is located outside the arc extinguishing chamber, while the moving contact piece 100 extends into the interior of the arc extinguishing chamber.

[0045] The short contact piece 300 is also provided with a short contact piece moving contact 301. The short contact piece moving contact 301 is located outside the arc extinguishing chamber, and the moving contact 101 extends into the interior of the arc extinguishing chamber, specifically, the moving contact 101 extends into the concave cavity formed by a pair of grid leg 323. Example 4

[0046] like Fig.10 , Fig.11Schematic diagram of the fourth embodiment. The difference between the fourth embodiment and the third embodiment is that the ventilation cavity 511 is hole-shaped, preferably a round hole. In this embodiment, the ventilation cavity 511 is provided on the partition plate 51 below the movable arc-striking piece 4 and is located on the side of the movable arc-striking piece 4 close to the contact system.

[0047] Similarly, when the ventilation cavity 511 is a hole, the high-temperature gas generated by the arc can flow through the ventilation cavity 511, thereby forming an arc in the dividing cavity located on both sides of the partition plate 51 due to the setting of the partition plate 51, thereby reducing the difficulty of switch disconnection.

[0048] It should be noted that the ventilation cavity 511 in the above-mentioned embodiment can be a groove or a hole, and its function is to connect the spaces on both sides of the partition plate 51. Therefore, anything with this effect should belong to the category of the ventilation cavity 511, such as grooves in various directions or holes in various shapes, such as open grooves, closed grooves, strip grooves, curved grooves, round holes, square holes, etc. And when the partition plate 51 is a groove, its extension direction is not limited.

Claims

1. A contact arc extinguishing system for a switch, comprising a contact system and an arc extinguishing chamber, wherein the arc extinguishing chamber comprises a plurality of grid plates (3) in an array, the contact system comprises a moving contact, a moving contact piece (100) is arranged on the moving contact, and the moving contact piece (100) is rotatably arranged on a contact support of the moving contact via a rotating shaft; characterized in that: The arc extinguishing chamber comprises at least one partition plate (51), the partition plate (51) extends from the arc extinguishing chamber toward the moving contact and is inserted between the moving contact pieces (100), the partition plate (51) divides the coaxially arranged moving contact pieces (100) into at least two groups, and a ventilation cavity (511) is provided on the partition plate (51).

2. A contact arc extinguishing system for a switch according to claim 1, characterized in that: The arc extinguishing chamber comprises a bracket (5), and the partition plate (51) is arranged on the bracket (5); the bracket (5) further comprises a side plate portion (52), and the side plate portion (52) is located on both sides of the bracket (5).

3. A contact arc extinguishing system for a switch according to claim 2, characterized in that: The bracket (5) further comprises a connecting portion, wherein the connecting portion connects the partition plate (51) and the side plate portion (52).

4. The contact arc extinguishing system of a switch according to claim 1, characterized in that: The grid sheet (3) comprises a first grid sheet (31) and a second grid sheet (32), wherein a first notch (311) is provided on an edge of one side of the first grid sheet (31) close to the contact system, and the number of the first notches (311) corresponds to the number of groups into which the moving contact sheet (100) is divided; the second grid sheet (32) comprises a second notch (321), and the second notch (321) is also located on an edge of one side of the second grid sheet (32) close to the contact system, and a pair of grid sheet legs (323) extending toward the contact system are provided on both sides of the middle second notch (321), and the heads of the grid sheet legs (323) are located on both sides of the moving contact point (101) of the moving contact sheet (100).

5. A contact arc extinguishing system for a switch according to claim 4, characterized in that: The grid legs (323) are inserted into the spacer plates (51).

6. A contact arc extinguishing system for a switch according to claim 4, characterized in that: The ventilation cavity (511) is an open slot with one end open, and the grid leg (323) is inserted into the ventilation cavity (511).

7. A contact arc extinguishing system for a switch according to claim 4, characterized in that: The grid plate (3) further comprises a third grid plate (33), the third grid plate (33) being provided with a long grid plate leg, the length of the long grid plate leg being greater than the grid plate leg (323) on the second grid plate (32), and the third grid plate (33) corresponds to the arc entrance of the arc extinguishing chamber.

8. The contact arc extinguishing system of a switch according to claim 4, characterized in that: The moving contact piece (100) is provided with a moving contact point (101), and the moving contact also has a short contact piece (300), the short contact piece (300) is opposite to the partition plate (51), and the moving contact piece (100) is opposite to the cavity on both sides of the partition plate (51), the length of the short contact piece (300) is smaller than the length of the moving contact piece (100), and the short contact piece moving contact point (301) is provided on the short contact piece (300), the short contact piece moving contact point (301) is located outside the arc extinguishing chamber, and the moving contact point (101) extends into the interior of the arc extinguishing chamber.

9. A contact arc extinguishing system for a switch according to claim 1, characterized in that: The arc extinguishing chamber also includes a pair of fixed plates (1), and a plurality of grid plates (3) are arrayed between the pair of fixed plates (1). A moving arc-striking plate (4) is provided at one end of the plurality of grid plates (3) in the array close to the moving contact. The moving arc-striking plate (4) is bent toward the inside of the arc extinguishing chamber to form a moving arc-striking plate extension section (41). The ventilation cavity (511) is hole-shaped. The ventilation cavity (511) is opened on the side of the moving arc-striking plate (4) close to the contact system on the partition plate (51).

10. A contact arc extinguishing system for a switch according to claim 1, characterized in that: A group of moving contact pieces (100) divided by the partition plate (51) includes one or two moving contact pieces (100).

Images