Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a contact system and an arc extinguish chamber, the contact system comprises a moving contact and a static contact, the arc extinguish chamber comprises a pair of side walls, a grid piece and a moving arc striking piece, the grid piece and the moving arc striking piece are installed between the pair of side walls, one side, facing the contact system, of the moving arc striking piece is provided with a matching part, and the moving contact is provided with a contact piece matched with the matching part. The circuit breaker is characterized in that a U-shaped electric loop is formed at the matching part and / or the head part of the corresponding contact piece, and an electric force moving towards the static contact is applied to an electric arc between the moving contact and the matching part. The advantages are that the arc is prevented from moving towards one side away from the static contact, so that the arc can be prevented from polluting the space of one side, away from the static contact, of the moving contact.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of low-voltage apparatus, specifically relates to a switch. BACKGROUND

[0002] Switches are widely used in low-voltage distribution systems, and can be closed, carried and opened under normal circuit conditions to provide safety protection for circuits.

[0003] The switch usually includes a contact system, which further includes a moving contact and a static contact. The moving contact is in contact with or separated from the static contact after being actuated, thereby enabling the switch itself to be turned on or off. When the switch is opened, an arc is generated between the moving contact and the static contact. Because the arc energy is relatively large, it can affect the breaking capacity of the switch. Therefore, the switch usually includes an arc extinguishing chamber for extinguishing the arc generated when the moving contact is separated from the static contact. The arc extinguishing chamber is an important component of the switch, and its arc extinguishing capacity directly affects the breaking capacity of the switch.

[0004] In the prior art, at least one arc contact is protrudingly arranged at the end of the moving contact body close to the arc extinguishing unit. On the one hand, the arc contact point is in contact with the corresponding static contact point earlier than other moving contact points when the switch is closed, and the arc contact point is separated from the corresponding static contact point later than other moving contact points when the switch is opened, so that only the arc contact has an arc and other moving contact points do not have an arc generated when the current is broken. On the other hand, the arc contact is extended into the arc extinguishing chamber with a narrow gap, thereby lengthening the arc and extinguishing the arc by using the narrow gap effect to extrude the arc and burn the gas generating material. However, during the opening process, an arc is formed between the arc contact and the arc striking piece of the arc extinguishing chamber. Without effective control, the arc can quickly move in the arc striking piece area of the arc extinguishing chamber. With the increase of breaking capacity / number of times, the narrow gap inner wall of the arc extinguishing chamber can be burned by the arc or contaminated by high-temperature ionized gas, and the contaminated area can gradually expand, which can even extend to the main contact area, thereby causing the main contact to be broken down.

[0005] In view of the above prior art, it is necessary to improve the structure of the arc extinguishing chamber of the existing switch. For this purpose, the applicant has made a useful design, and the technical solution to be introduced below is generated in this background. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a switch which can prevent the arc from moving in the connecting direction between the moving contact and the static contact, and avoid the occurrence of arc contamination.

[0007] The utility model discloses a switch, including contact system and arc extinguishing chamber, contact system include movable contact and static contact, the arc extinguishing chamber includes a pair of side walls, and the gill and the dynamic arc starting piece of installation between a pair of side walls, dynamic arc starting piece has the cooperation on the side towards contact system, movable contact has the contact piece with cooperation, forms U-shaped electric circuit in the cooperation and / or corresponding contact piece's head portion, and the electric arc between movable contact and cooperation is to the static contact direction movement electric power is added to the direction of static contact.

[0008] In one embodiment of the utility model, a slot with one end as an open end and the other end as a closed end is formed on the cooperation, the closed end is biased towards the side away from the static contact, and the U-shaped electric circuit with the opening towards the static contact is formed.

[0009] In another embodiment of the utility model, the cooperation is formed by bending a metal sheet, the cooperation includes a first part, a second part and a third part, the first part, the second part and the third part are connected in sequence to form a U-shaped structure, and the opening of the U-shaped structure formed by the three parts is towards the static contact.

[0010] In still another embodiment of the utility model, a cooperation slot is formed on the head portion of the contact piece matched with the cooperation, the head portion extends towards the side away from the static contact to form an "L" shape, and the closed end of the cooperation slot is biased towards the side away from the static contact to form the U-shaped electric circuit with the opening towards the static contact.

[0011] In still another embodiment of the utility model, the dynamic arc starting piece includes a lower arc starting piece and an upper arc starting piece connected with each other, the lower arc starting piece is a casting, and the upper arc starting piece is a sheet, and the cooperation is located on the side of the lower arc starting piece towards the movable contact.

[0012] In still another embodiment of the utility model, the slot includes a first slot and a second slot, the first slot is longitudinally arranged, the bottom is formed as an open end downwards, and the top extends upwards, the second slot is transversely arranged, one end of the second slot is communicated with the upper end of the first slot, and the other end of the second slot is biased towards the side of the first slot away from the static contact and extends to form the closed end at the end.

[0013] In still another embodiment of the utility model, the slot further includes a third slot, the third slot is transversely arranged, one end of the third slot is communicated with the first slot and the second slot, and the other end of the third slot is biased towards the side of the first slot close to the static contact and extends.

[0014] In a further specific embodiment of the utility model, the opening end of the groove is 10mm≤A≤20mm away from the end of the moving arc -generating piece close to the stationary contact.

[0015] In a further specific embodiment of the utility model, the opening end of the groove is 10mm≤A≤20mm away from the end of the moving arc -generating piece close to the stationary contact.

[0016] In a further specific embodiment of the utility model, the matching groove includes vertical groove and horizontal groove, and the vertical groove and the horizontal groove form "L" shape.

[0017] In the utility model, the U-shaped electric circuit with the opening towards the side of the stationary contact is formed in the matching part and / or the head of the corresponding contact piece, the electric force towards the stationary contact direction is exerted on the electric arc between the moving contact and the matching part, the electric arc is prevented from moving to the side away from the stationary contact, so that the electric arc can prevent the space on the side away from the stationary contact of the moving contact from being contaminated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structural schematic view of the contact system and arc extinguishing chamber of the utility model;

[0019] Figure 2 It is the explosion schematic view of the arc extinguishing chamber of the utility model;

[0020] Figure 3 It is the installation schematic view of the moving arc -generating piece of the utility model;

[0021] Figure 4 It is the structural schematic view of the upper arc -generating piece of the utility model;

[0022] Figure 5 It is the structural schematic view of the lower arc -generating piece of the utility model;

[0023] Figure 6 It is the three-dimensional schematic view of the first embodiment of the utility model

[0024] Figure 7 It is the side schematic view of the first embodiment of the utility model;

[0025] Figure 8 It is the side schematic view of the second embodiment of the utility model;

[0026] Figure 9 It is the partial schematic view of the third embodiment of the utility model;

[0027] Figure 10 Part of the schematic diagram of the fourth embodiment of the utility model relates to;

[0028] Figure 11 Part of the schematic diagram of the fifth embodiment of the utility model relates to;

[0029] Figure 12 Part of the schematic diagram of the sixth embodiment of the utility model relates to;

[0030] Figure 13 Part of the schematic diagram of the seventh embodiment of the utility model relates to;

[0031] Figure 14 Part of the schematic diagram of the eighth embodiment of the utility model relates to;

[0032] Figure 15 Part of the schematic diagram of the ninth embodiment of the utility model relates to;

[0033] Figure 16 Part of the schematic diagram of the tenth embodiment of the utility model relates to.

[0034] In the figure: 1. contact system, 11. movable contact, 111. long contact patch, 1111. head, 112. short contact patch, 12. stationary contact; 2. arc extinguishing chamber, 21. side wall, 22. grid, 23. movable arc starting piece, 231. lower arc starting piece, 2311. matching part, 23111. first part, 23112. second part, 23113. third part, 23114. fourth part, 23115. fifth part, 23116. sixth part, 2312. first extension, 2313. second extension, 2314. third extension, 232. upper arc starting piece, 2321. extension, 23211. mounting hole, 2322. body, 24. gas generating piece, 25. pin connecting rod; 100. groove, 101. first groove, 102. second groove, 103. third groove; 200. insulating sleeve; 300. matching groove, 301. vertical groove, 302. horizontal groove. DETAILED DESCRIPTION

[0035] The specific embodiments of the utility model are described in detail below in combination with the drawings, but the description of the embodiments is not a limitation on the technical solutions, and any formal but not substantial changes according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0036] In the following description, the concepts of directionality (or directionality) such as up, down, left, right, front and back are relative to the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as a special limitation on the technical solutions provided by the utility model. Embodiment 1

[0037] Please refer to Figure 1 The utility model relates to a kind of switches, including contact system 1 and arc-extinguishing chamber 2, the contact system 1 including movable contact 11 and static contact 12, the movable contact 11 is contacted or separated after rotating with the static contact 12, realize the conduction or separation of contact system 1, to make switch itself realize conduction or disconnecting in turn.The arc-extinguishing chamber 2 is installed in the opening direction of the movable contact 11 and the static contact 12 one side, the arc generated between the movable contact 11 and the static contact 12 enters the arc-extinguishing chamber 2, and is extinguished in arc-extinguishing chamber 2.

[0038] Please refer to Figure 2 The arc-extinguishing chamber 2 includes a pair of side walls 21 and grid 22 installed between a pair of side walls 21.The grid 22 is multiple, and is spaced apart from each other.The arc-extinguishing chamber 2 further includes dynamic arc starter 23, the dynamic arc starter 23 is correspondingly arranged on the side of the movable contact 11, including lower arc starter 231 and upper arc starter 232, the lower arc starter 231 and upper arc starter 232 are connected and installed.

[0039] Further, a pair of gas generator 24 is also provided in the arc-extinguishing chamber 2, the pair of gas generator 24 is spaced apart, and the gap between them is formed into arc channel.The grid 22, side wall 21 and gas generator 24 are connected in series by pin joint stick 25, and the installation and positioning of the three are realized by pin joint stick 25.

[0040] Please refer to Figure 3 And Figure 4 The lower arc starter 231 is a casting, which is processed from a metal block;The upper arc starter 232 is a sheet body, which is bent from a metal sheet body.The upper arc starter 232 includes extension 2321 and body 2322, the extension 2321 is strip-shaped, and the body 2322 is plate-shaped.The body 2322 is located on the outside of the grid 22 array, and is parallel and spaced apart from the grid 22.The extension 2321 extends downward from the bottom of the body 2322, and the extension end of the extension 2321 is fixedly connected with the lower arc starter 231.In this embodiment, the extension 2321 is provided with mounting hole 23211, and the lower arc starter 231 and the upper arc starter 232 are connected and installed by screw passing through the mounting hole 23211.

[0041] See Figure 5 And Figure 6The lower arc leading member 231 comprises a fitting part 2311, a first extension part 2312, a second extension part 2313 and a third extension part 2314. The fitting part 2311, the first extension part 2312, the second extension part 2313 and the third extension part 2314 are sequentially connected in a head-to-tail manner to form an open fence shape. Specifically, the fitting part 2311 is arranged transversely on the air inlet side of the arc extinguishing chamber 2, i.e. the fitting part 2311 is located on the side of the lower arc leading member 231 facing the contact system 1. The first extension part 2312 extends vertically upward at one end of the fitting part 2311 and is perpendicular to the fitting part 2311. The second extension part 2313 is connected between the first extension part 2312 and the third extension part 2314 in an inclined manner. The third extension part 2314 is arranged in parallel with the first extension part 2312 and is located on the side of the fitting part 2311 away from the air inlet of the arc extinguishing chamber 2. An opening is formed between the fitting part 2311 and the third extension part 2314.

[0042] The moving contact 11 comprises a long contact piece 111 and a short contact piece 112, which are arranged side by side and constitute the moving contact piece of the moving contact 11. The long contact piece 111 is inserted into the arc extinguishing chamber 2, and the short contact piece 112 is located outside the arc extinguishing chamber 2. The long contact piece 111 is provided with a head part 1111 at the extension end thereof, which cooperates with the moving arc leading member 23. The head part 1111 extends away from the stationary contact 12 and forms an "L" shape.

[0043] The utility model discloses the features are that the groove 100 is set up on the fitting part 2311. The groove 100 can standardize the arc between the long contact piece 111 and the fitting part 2311, and prevent the arc from moving in the connecting direction between the moving contact 11 and the stationary contact 12.

[0044] One end of the groove 100 is formed as an open end, and the other end is formed as a closed end. The open end is arranged downward, and the closed end is biased away from the stationary contact 12. The current in the fitting part 2311 forms a U shape, and the opening of the U shape faces the stationary contact 12. The electric force of the arc between the moving contact 11 and the fitting part 2311 is applied to move toward the stationary contact 12, thereby preventing the moving contact 11 from being contaminated by the arc away from the stationary contact 12.

[0045] The groove 100 includes a first groove 101 and a second groove 102. In this embodiment, the first groove 101 and the second groove 102 form an "L" shape. Specifically, the first groove 101 is arranged longitudinally, with an open bottom and an upward-extending top. The second groove 102 is arranged laterally, with one end connected to the upper end of the first groove 101, and the other end extending offset away from the stationary contact 12 and forming the closed end. Here, "arranged laterally" means generally laterally arranged and does not require horizontal alignment.

[0046] like Figure 6 and Figure 7 As shown, the distance A between the opening end of the slot 100 and the end of the moving arc-initiating member 23 near the stationary contact 12 is denoted as A. With this arrangement, the current in the region A of the moving arc-initiating member 23 is driven by an electrodynamic force moving away from the stationary contact 12, causing the arc to move away from the stationary contact 12. When the arc crosses the slot 100, the opening formed by the current in the mating part 2311 faces the stationary contact 12. This current applies an electrodynamic force to the arc, driving it towards the stationary contact 12, thereby preventing the arc from continuing to move away from the stationary contact 12 and avoiding contamination of the space on the side of the moving contact 11 away from the stationary contact 12. Preferably, the value of A is in the range of 10mm ≤ A ≤ 20mm. Example 2

[0047] Figure 8 This is a schematic diagram of the second embodiment. The difference between this second embodiment and the first embodiment is that the groove 100 further includes a third groove 103. The third groove 103 is also horizontally arranged, with one end connected to the first groove 101 and the second groove 102, and the other end extending biased towards the side of the first groove 101 closer to the stationary contact 12. Here, "horizontally arranged" means approximately horizontal and does not require a perfectly horizontal orientation. The first groove 101, the second groove 102, and the third groove 103 form a "T" shape. Due to the presence of the third groove 103, when the arc is located below the third groove 103, the arc is subjected to an electrodynamic force that pushes it closer to the first groove 101.

[0048] The second groove 102 and the third groove 103 work together to stabilize the electric arc at the opening of the first groove 101, thereby stabilizing the electric arc and preventing the electric arc from contaminating the side of the moving contact 11 away from the stationary contact 12. Example 3

[0049] Figure 9It is a schematic view of the third embodiment. The difference between this embodiment and the first and second embodiments is that an insulating sleeve 200 is sleeved on the rear side of the head 1111 of the long contact piece 111, and the insulating sleeve 200 is fixedly installed on the long contact piece 111. The insulating sleeve 200 covers the side of the head 1111 away from the contact point on the long contact piece 111.

[0050] Similarly, other embodiments can also be formed by sleeving an insulating sleeve 200 on the rear side of the head 1111 of the long contact piece 111 on the basis of the second embodiment. Since the description is basically the same as that of the third embodiment, it will not be repeated. Embodiment 4

[0051] Figure 10 It is a schematic view of the fourth embodiment. The difference between this embodiment and the first embodiment is that the groove 100 only includes the second groove 102, and the second groove 102 is transversely arranged, with one end opening towards the static contact 12 and the other end away from the static contact 12 being closed. The matching part 2311 includes a first part 23111, a second part 23112 and a third part 23113, which are connected end to end to form a U-shaped structure, and the U-shaped structure formed by the three parts opens towards the static contact 12. When an arc is generated, the current in the matching part 2311 forms a U shape opening towards the static contact 12. This current exerts an electric force on the arc, driving it towards the side of the static contact 12, thereby preventing the arc from moving further away from the static contact 12. In this embodiment, the moving arc piece 23 is correspondingly arranged on one side of the moving contact 11, and includes a lower arc piece 231 and an upper arc piece 232, which are fixedly connected and installed. The lower arc piece 231 is a casting, which is processed from a metal block. Embodiment 5

[0052] Figure 11 It is a schematic view of the fifth embodiment. The difference between this embodiment and the fourth embodiment is that the lower arc piece 231 and the upper arc piece 232 are integrally formed by bending a metal sheet, and have the same shape as the fourth embodiment. Similarly, the matching part 2311 includes a first part 23111, a second part 23112 and a third part 23113, which are connected end to end to form a U-shaped structure, and the U-shaped structure formed by the three parts opens towards the static contact 12. When an arc is generated, the current in the matching part 2311 forms a U shape opening towards the static contact 12. Embodiment 6

[0053] Figure 12Fig. 6 is a schematic view of a sixth embodiment. In this embodiment, the lower arc guide 231 and the upper arc guide 232 are integrally formed by bending a metal sheet. The fitting portion 2311 includes a first portion 23111, a second portion 23112, and a third portion 23113. The first portion 23111, the second portion 23112, and the third portion 23113 are connected end to end to form a U-shaped structure. The opening of the U-shaped structure faces the stationary contact 12. The fitting portion 2311 further includes a fourth portion 23114, a fifth portion 23115, and a sixth portion 23116. The fourth portion 23114, the fifth portion 23115, and the sixth portion 23116 are also connected end to end to form a U-shaped structure with its opening facing upward. The U-shaped structure formed by the fourth portion 23114, the fifth portion 23115, and the sixth portion 23116 is located on the side of the U-shaped structure formed by the first portion 23111, the second portion 23112, and the third portion 23113 that is closer to the stationary contact 12. The first portion 23111 is spaced apart from the fourth portion 23114, and the fourth portion 23114 is connected to the third portion 23113. Embodiment 7

[0054] Figure 13 Fig. 7 is a schematic view of a seventh embodiment. The seventh embodiment is different from the sixth embodiment described above in that the first portion 23111 and the third portion 23113 have a greater width. Embodiment 8

[0055] Figure 14 Fig. 8 is a schematic view of an eighth embodiment. The eighth embodiment is different from the fifth embodiment described above in that the lower arc guide 231 and the upper arc guide 232 are two separate parts that are fixedly connected. Both the lower arc guide 231 and the upper arc guide 232 are formed by bending a metal sheet. Embodiment 9

[0056] Figure 15The ninth embodiment is shown in the figure. The difference between this embodiment and the above-mentioned embodiments is that the fitting part 2311 of the arc guiding part 231 is not formed into a U-shaped electric loop by bending or slotting, but a fitting slot 300 is formed on the head part 1111 of the long contact piece 111, the closed end of the fitting slot 300 is biased towards the side away from the static contact 12, and a U-shaped electric loop is formed by the fitting slot 300, which is open towards the static contact 12. At this time, the fitting slot 300 only includes a horizontal slot 302. Further, because the head part 1111 is not sunken on the side of the U-shaped electric loop close to the static contact 12, the opening of the U-shaped electric loop is connected to a vertical slot 301, at this time, the fitting slot 300 includes the vertical slot 301 and the horizontal slot 302, and the vertical slot 301 and the horizontal slot 302 form an "L" shape. Both of the above-mentioned structures form a U-shaped electric loop on the head part 1111, which is open towards the static contact 12, and similarly, the U-shaped electric loop generates an electric force towards the static contact 12 on the electric arc between the long contact piece 111 and the fitting part 2311.

[0057] Embodiment 10

[0058] Figure 16 The tenth embodiment is shown in the figure. The difference between this embodiment and the ninth embodiment is that a slot 100 is formed on the fitting part 2311 of the arc guiding part 231. The slot 100 includes a first slot 101 and a second slot 102, in this embodiment, the first slot 101 and the second slot 102 form an "L" shape. Specifically, the first slot 101 is longitudinally arranged, the bottom is formed into an opening, and the top extends upwards, the second slot 102 is transversely arranged, one end is connected to the upper end of the first slot 101, the other end is biased to extend away from the static contact 12 on the side of the first slot 101 and forms the closed end at the end, and a fitting slot 300 is formed on the head part 1111 of the long contact piece 111, the fitting slot 300 includes a vertical slot 301 and a horizontal slot 302, the vertical slot 301 and the horizontal slot 302 form an "L" shape, and the fitting slot 300 is biased away from the static contact 12. The characteristic of this embodiment is that a U-shaped electric loop is formed on both the head part 1111 and the fitting part 2311, which is open towards the static contact 12, and both U-shaped electric loops generate an electric force towards the static contact 12 on the electric arc between the long contact piece 111 and the fitting part 2311.

[0059] In the above-mentioned embodiments, the contact piece of the moving contact 11 corresponding to the fitting part 2311 is a long contact piece 111, but for other forms of moving contact 11, the contact piece corresponding to the fitting part 2311 can be several contact pieces or all contact pieces, which also belongs to the protection scope of the present invention.

Claims

1. A switch comprising a contact system (1) and an arc chamber (2), said contact system (1) comprising a moving contact (11) and a stationary contact (12), said arc chamber (2) comprising a pair of side walls (21) and a grid (22) and a moving arc starter (23) mounted between the pair of side walls (21), said moving arc starter (23) having a mating portion (2311) on a side facing the contact system (1), said moving contact (11) having a contact tab mating with said mating portion (2311), characterized in that: The head of the contact piece matched with the matching part (2311) is provided with a matching groove (300), the head extends to the side away from the static contact (12) to form an L shape, and the closed end of the matching groove (300) is biased to the side away from the static contact (12) to form a U-shaped electric circuit with the opening facing the static contact (12).

2. A switch according to claim 1, characterised in that: The head of the contact piece matched with the matching part (2311) is provided with a matching groove (300), the head extends to the side away from the static contact (12) to form an L shape, and the closed end of the matching groove (300) is biased to the side away from the static contact (12) to form a U-shaped electric circuit with the opening facing the static contact (12).

3. A switch according to claim 1, wherein: The matching part (2311) is bent from a metal sheet body, and the matching part (2311) comprises a first part (23111), a second part (23112) and a third part (23113), the first part (23111), the second part (23112) and the third part (23113) are sequentially connected to form a U-shaped structure, and the U-shaped structure formed by the three parts has an opening facing the static contact (12).

4. A switch according to claim 1, wherein: The head of the contact piece matched with the matching part (2311) is provided with a matching groove (300), the head extends to the side away from the static contact (12) to form an L shape, and the closed end of the matching groove (300) is biased to the side away from the static contact (12) to form a U-shaped electric circuit with the opening facing the static contact (12).

5. A switch according to claim 1, wherein: The moving arc striking member (23) comprises a lower arc striking member (231) and an upper arc striking member (232) connected to each other, the lower arc striking member (231) is a casting, and the upper arc striking member (232) is a sheet body, and the matching part (2311) is located on the side of the lower arc striking member (231) facing the moving contact (11).

6. A switch according to claim 2, wherein: The groove (100) comprises a first groove (101) and a second groove (102), wherein the first groove (101) is longitudinally arranged, the bottom is formed as an opening facing downward, and the top extends upward, the second groove (102) is transversely arranged, one end of the second groove (102) is communicated with the upper end of the first groove (101), the other end of the second groove (102) is biased to extend away from the side of the first groove (101) away from the static contact (12) and forms the closed end at the end.

7. A switch according to claim 6, characterised in that: The groove (100) further comprises a third groove (103), the third groove (103) is transversely arranged, one end of the third groove (103) is communicated with the first groove (101) and the second groove (102), and the other end of the third groove (103) is biased to extend to the side of the first groove (101) close to the static contact (12).

8. A switch according to any one of claims 2, 3 or 4, wherein: The moving contact (11) comprises a long contact piece (111) and a short contact piece (112), the long contact piece (111) and the short contact piece (112) are arranged side by side, the long contact piece (111) is inserted into the inside of the arc extinguishing chamber (2), and the short contact piece (112) is located outside the arc extinguishing chamber (2), and the extension end of the long contact piece (111) is provided with a head (1111) matched with the moving arc striking member (23).

9. A switch according to claim 2, wherein: The distance between the open end of the groove (100) and the end of the moving arc striking member (23) close to the static contact (12) is A, and 10mm≤A≤20mm.

10. A switch according to claim 4, wherein: The matching groove (300) comprises a vertical groove (301) and a horizontal groove (302), the vertical groove (301) and the horizontal groove (302) form an L shape.

Images