Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a shell, a contact system installed in the shell and an arc extinguish chamber located above the contact system, the contact system comprises a static contact, the static contact comprises a conductive block and an arc striking piece installed on the conductive block, the arc striking piece extends towards the arc extinguish chamber, the contact system is characterized in that the contact system further comprises an insulating part, the insulating part comprises a pair of insulating blocks and a support, the insulating blocks are connected to the support, and the insulating blocks are connected to the support. The support is installed on the shell, and the pair of insulation blocks are located on the two sides of the arc striking piece. The device has the advantages that the space at the arc striking sheet can be reduced, the pneumatic thrust applied to the arc is improved, and the arc can quickly move upwards; and meanwhile, the insulating gas generated by the insulating block is closer to the static contact and the arc striking sheet, so that the contact is prevented from being reignited.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a switch. Background Art

[0002] A switch is a very important electrical device in power supply and distribution circuits. It can cut off the current it carries to disconnect the circuit, thus protecting the circuit and electrical equipment. A switch usually includes a contact system, which includes a moving contact and a stationary contact. After the moving contact moves, it contacts or separates with the stationary contact, thereby turning the switch on or off. As is known in the industry, when the switch is disconnected, an arc is generated between the moving contact and the stationary contact. Due to the relatively large energy of the arc, it causes great difficulties in disconnecting the switch. In view of this, the switch usually also includes an arc extinguishing chamber to extinguish the arc generated when the moving contact and the stationary contact separate. Only when the arc is extinguished is the circuit disconnected.

[0003] Typically, a gas-generating insulator is installed within the arc extinguishing chamber. When the arc enters the arc extinguishing chamber, the gas-generating insulator is heated to absorb the arc energy. Simultaneously, the insulating gas released from the gas-generating insulator accelerates the arc's extinction. However, because the gas-generating insulator is not typically designed to work with the arc-starting plate on the static contact, it hinders the arc's rapid entry into the grid and fails to effectively prevent the arc from reigniting at the contact. Utility Model Content

[0004] The purpose of the utility model is to provide a switch, which has an insulating member installed on the switch housing, and a pair of insulating blocks on the insulating member. The pair of insulating blocks are located on both sides of the arc-strike piece on the static contact, which can reduce the space at the arc-strike piece, thereby increasing the pneumatic thrust received by the arc and preventing restrike at the contact.

[0005] The purpose of the present utility model is achieved in this way. A switch includes a shell, a contact system installed inside the shell and an arc extinguishing chamber located above the contact system, the contact system includes a static contact, the static contact includes a conductive block and an arc-striking piece installed on the conductive block, the arc-striking piece extends toward the arc extinguishing chamber, and also includes an insulating part, the insulating part includes a pair of insulating blocks and a bracket, the insulating block is connected to the bracket, the bracket is installed on the shell, and a pair of insulating blocks are located on both sides of the arc-striking piece.

[0006] In a specific embodiment of the present invention, the bracket includes an insert and a connecting portion. The insert is installed on the shell. The insert is a pair, and the connecting portion connects one end of the two inserts in the same direction, so that the bracket is configured as a "U" shape.

[0007] In another specific embodiment of the present invention, the bracket includes a pair of inserting pieces, and the pair of inserting pieces are spaced apart and mounted on the housing.

[0008] In another specific embodiment of the present invention, the shell is formed by splicing a base and a bottom plate, and the insert is installed in conjunction with the base and the bottom plate.

[0009] In another specific embodiment of the present invention, the insulating block is made of a gas-generating material.

[0010] In another specific embodiment of the present invention, the insulating block has a clearance cavity and a fixing foot, the clearance cavity is used to make way for the protrusion on the conductive block when the insulating block is installed, and the insulating block is connected to the plug through the fixing foot.

[0011] In a further specific embodiment of the present invention, the insulating block and the insert are integrally formed.

[0012] In a more specific embodiment of the present invention, the base includes partition walls, multiple partition walls are arranged in parallel and at intervals, and an installation cavity is formed on the open side of the partition wall facing the base; the insert is arranged corresponding to the side plate of the arc extinguishing chamber, and an offset embedded portion is provided on the extended end of the insert, and the installation cavity is used to be embedded and matched with the bottom of the embedded portion.

[0013] In yet another specific embodiment of the present invention, a positioning strip is provided on the outer side of the insert, the positioning strip is arranged along the splicing direction between the base and the bottom plate, and a positioning groove is provided on the partition wall, and the positioning groove is inserted into and matched with the positioning strip.

[0014] In yet another specific embodiment of the present invention, a plurality of isolation walls are provided on the bottom plate, and the isolation walls are arranged corresponding to the partition walls. Positioning holes are provided on the inner sides of the isolation walls, and the positioning holes are used for inserting the head of the embedded part.

[0015] Due to the adoption of the above structure, the utility model has the beneficial effects: the insulating member installed on the switch housing includes a pair of insulating blocks, and the pair of insulating blocks are located on both sides of the arc-striking piece on the static contact, which can reduce the space at the arc-striking piece, so that the arc is subjected to a greater pneumatic thrust at this place and can move upward faster; at the same time, the insulating gas generated by the insulating blocks is closer to the static contact and the arc-striking piece, preventing the contact from reigniting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded schematic diagram of the switch of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the arc extinguishing chamber, static contact and base plate of the utility model;

[0018] Figure 3 This is a structural diagram of one side of the arc extinguishing chamber and the insulating member of the present invention;

[0019] Figure 4 This is a structural diagram of the other side of the arc extinguishing chamber and the insulating member of the present invention;

[0020] Figure 5 This is a structural schematic diagram of one side of the first embodiment of the insulating member of the present invention;

[0021] Figure 6 This is a schematic structural diagram of the other side of the first embodiment of the insulating member of the present invention;

[0022] Figure 7 This is a structural diagram of the first embodiment of the base of the utility model;

[0023] Figure 8 This is a structural diagram of the first embodiment of the base plate of the utility model;

[0024] Figure 9 This is a structural diagram of the second embodiment of the insulating element of the present invention.

[0025] In the figure: 1. Housing, 11. Base, 111. Partition wall, 1111. Positioning groove, 1112. Mounting cavity, 12. Bottom plate, 121. Isolation wall, 122. Positioning hole; 2. Contact system, 21. Moving contact, 22. Static contact, 221. Arc-starting plate, 222. Gasket, 223. Static contact; 3. Arc-extinguishing chamber, 31. Side plate, 32. Grid, 33. Arc-extinguishing cover; 4. Insulator, 41. Insulating block, 411. Clearance cavity, 412. Fixing foot, 42. Bracket, 421. Insert, 4211. Embedded portion, 422. Connecting portion, 43. Positioning strip. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as within the scope of protection of the present invention.

[0027] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings. They are only used to facilitate the description of the technical solution provided by the present invention and to simplify the description in conjunction with the drawings. Therefore, they should not be understood as a special limitation on the technical solution provided by the present invention. Example 1

[0028] like Figure 1 The switch includes a housing 1, a contact system 2 mounted within the housing 1, and an arc extinguishing chamber 3 positioned in the opening direction of the contact system 2. The arc extinguishing chamber 3 is inserted into the housing 1 from above and positioned above the contact system 2. The switch also includes an operating mechanism (not shown) that drives the contact system 2 to close or open, thereby switching the switch on or off.

[0029] The contact system 2 includes a moving contact 21 and a stationary contact 22 . The moving contact 21 is swingably arranged, while the stationary contact 22 is fixedly arranged. The moving contact 21 is in contact with or separated from the stationary contact 22 after swinging.

[0030] The housing 1 is formed by splicing a base 11 and a bottom plate 12 , that is, the base 11 and the bottom plate 12 together form the housing 1 . The operating mechanism is installed on the outside of the base 11 and is connected to the moving contact 21 via a connecting rod.

[0031] More specifically, the moving contact 21 is mounted on the base 11 , and the static contact 22 is mounted on the bottom plate 12 .

[0032] The switch further includes an insulating member 4, which is mounted on the housing 1 and cooperates with the arc extinguishing chamber 3 and the static contact 22. This cooperation refers to a positional relationship. That is, after the insulating member 4 is installed, the position of the insulating member 4, the arc extinguishing chamber 3 and the static contact 22 should meet the expected design requirements.

[0033] like Figure 2 The static contact 22 is mounted on the inner wall of the base plate 12, specifically on the inner wall of the corresponding contact cavity. The static contact 22 includes a conductive block and an arc-striking piece 221 mounted on the conductive block. Specifically, one end of the arc-striking piece 221 is riveted to the conductive block, while the other end extends toward the arc-extinguishing chamber 3.

[0034] The static contact 22 also includes a gasket 222, which surrounds the arc-striking piece 221. A static contact point 223 is also fixed to the static contact 222, located on the side of the arc-striking piece 221 away from the arc-extinguishing chamber 3. That is, the arc-striking piece 221 is located on the side of the static contact 223 facing the arc-extinguishing chamber 3. A protruding contact portion is also provided on the conductive block, on the side of the arc-striking piece 221 near the static contact point 223, for striking an arc when the moving contact 21 and the static contact 22 are separated.

[0035] The insulating member 4 includes a pair of insulating blocks 41, located on either side of the arc-striking plate 221. The insulating blocks 41 are mounted on the housing 1. Because the pair of insulating blocks 41 occupy the space on either side of the arc-striking plate 3, the arc cannot move laterally due to space limitations. The narrow space also increases aerodynamic force, making it easier for the arc to quickly enter the arc-extinguishing chamber 3. Preferably, the insulating blocks 41 are made of a gas-generating material. When an arc is generated, the insulating blocks 41 absorb the arc energy and release insulating gas. The insulating gas remains at the static contact 22, preventing the arc from reigniting at the contact.

[0036] like Figure 3 、 Figure 4 The arc extinguishing chamber 3 includes a pair of side plates 31, an array of grid plates 32 is arranged between the pair of side plates 31, and the grid plates 32 are multiple and spaced apart from each other. An arc extinguishing cover 33 is arranged above the grid plates 32.

[0037] The insulating member 4 is in sheet form and is attached to the side plate 31 , while the insulating block 41 extends into the interior of the arc extinguishing chamber 3 and reaches a designated position.

[0038] like Figure 5 、 Figure 6 The insulating member 4 further includes a bracket 42 , the insulating block 41 is connected to the bracket 42 , and the bracket 42 is mounted on the housing 1 .

[0039] Specifically, the bracket 42 includes a tab 421 and a connecting portion 422. The tab 421 is mounted on the housing 1, more specifically, on the base 11 and / or the bottom plate 12. In this embodiment, the tab 421 is mounted in conjunction with both the base 11 and the bottom plate 12. The tabs 421 are arranged to correspond to the side panels 31 of the arc extinguishing chamber 3. The tabs 421 form a pair, and the connecting portion 422 connects the ends of the two tabs 421 in the same direction, thereby forming a "U" shape. Both the tab 421 and the connecting portion 422 are sheet-shaped.

[0040] The insulating block 41 has a clearance cavity 411, which is used to clear the protruding portion of the conductive block when the insulating block 41 is installed, thereby ensuring a tight fit between the two.

[0041] The insulating block 41 also has a fixing foot 412. Specifically, the insulating block 41 is connected to the insert 421 via the fixing foot 412, thereby achieving a fixed relationship of the insulating block 41. Preferably, the bracket 42 and the insulating block 41 are integrally formed.

[0042] An offset embedded portion 4211 is provided at the extended end of the insert 421, i.e., the end of the insert 421 away from the connecting portion 422. The embedded portion 4211 is configured to be mounted in conjunction with the base 11 and / or the bottom plate 12.

[0043] A positioning bar 43 is provided on the outer side of the insert 421. The positioning bar 43 extends along the splicing direction between the base 11 and the bottom plate 12, or is provided along the array direction of the grid plates 32 of the arc extinguishing chamber 3. Preferably, one end of the positioning bar 43 is close to the embedded portion 4211, and the positioning bar 43 extends from the embedded portion 4211 to the connecting portion 422.

[0044] like Figure 7 , is a schematic diagram of the base 11, the base 11 includes partition walls 111, and a plurality of partition walls 111 are parallel to each other and spaced apart, so that the base 11 is divided into common pole cavities. Each common pole cavity is used to accommodate a contact system 2 and an arc extinguishing chamber 3 after cooperating with the bottom plate 12. Positioning grooves 1111 are provided on both sides of the common pole cavity and arranged on the partition walls 111, and an installation cavity 1112 is formed on the open side of the partition walls 111 facing the base 11, the installation cavity 1112 is used to be embedded with the bottom of the embedding portion 4211, and the head of the embedding portion 4211 is embedded in the base 12. The positioning groove 1111 is inserted and matched with the positioning bar 43, thereby satisfying the installation positioning of the insert 421, that is, satisfying the installation positioning of the insulating member 4.

[0045] like Figure 8 , is a schematic diagram of the bottom plate 12. The bottom plate 12 is provided with a plurality of partition walls 121, which separate the bottom plate 12 into a female pole cavity. The female pole cavity cooperates with the male pole cavity to form a pole cavity. The partition walls 121 are arranged correspondingly to the partition walls 111. When the base 11 and the bottom plate 12 are spliced together, the partition walls 121 and the partition walls 111 are spliced together, and the base 11 and the bottom plate 12 enclose the plurality of pole cavities of the housing 1. Since the upper and lower sides of the insert 421 are inserted between the base 11 and the bottom plate 12, the insulation between adjacent pole cavities can be better improved.

[0046] A positioning hole 122 is provided on the inner side of the isolation wall 121. The positioning hole 122 is used for inserting the head of the embedded part 4211 to achieve the positioning and matching of the two, that is, to complete the installation and matching relationship of the insert 421 on the base 11 and the bottom plate 12.

[0047] It is worth noting that: in this embodiment, the insulating block 41 and the grid plate 32 are spaced apart. More preferably, in the height direction of the arc extinguishing chamber 3 where the grid plate 32 extends, the two are also spaced apart, and the insulating block 41 does not cover the grid plate 32. Example 2

[0048] like Figure 9 FIG2 is a schematic diagram of a second embodiment of the insulating member 4. This embodiment differs from the first embodiment in that the bracket 42 comprises only a tab 421 and lacks a connecting portion 422. Specifically, the bracket 42 comprises a pair of tabs 421 spaced apart from each other, forming two separate parts. More specifically, the tabs 421 are located on either side of the side plate 31 of the arc extinguishing chamber 3 and are symmetrically arranged along the centerline of the arc extinguishing chamber 3. The insulating block 41 is mounted on the tabs 421. The other mounting arrangements are the same as those of the first embodiment.

[0049] Preferably, the insulating block 41 and the insert 421 are integrally formed.

Claims

1. A switch comprising a housing (1), a contact system (2) mounted inside the housing (1), and an arc extinguishing chamber (3) located above the contact system (2), wherein the contact system (2) comprises a stationary contact (22), the stationary contact (22) comprises a conductive block and an arc striking piece (221) mounted on the conductive block, the arc striking piece (221) extending toward the arc extinguishing chamber (3), and is characterized in that: It also includes an insulating member (4), the insulating member (4) including a pair of insulating blocks (41) and a bracket (42), the insulating block (41) is connected to the bracket (42), the bracket (42) is mounted on the housing (1), and the pair of insulating blocks (41) are located on both sides of the arc-starting plate (221).

2. A switch according to claim 1, characterized in that: The bracket (42) includes an insert (421) and a connecting portion (422). The insert (421) is mounted on the housing (1). The insert (421) is a pair, and the connecting portion (422) connects one end of the two inserts (421) in the same direction, so that the bracket (42) is formed into a "U" shape.

3. The switch according to claim 1, wherein: The bracket (42) comprises a pair of inserting pieces (421), and the pair of inserting pieces (421) are arranged at intervals and mounted on the housing (1).

4. A switch according to claim 2 or 3, characterized in that: The housing (1) is formed by splicing a base (11) and a bottom plate (12), and the insert (421) is installed in conjunction with the base (11) and the bottom plate (12).

5. The switch according to claim 1, characterized in that: The insulating block (41) is made of gas-generating material.

6. A switch according to claim 2 or 3, characterized in that: The insulating block (41) is provided with a clearance cavity (411) and a fixing foot (412). The clearance cavity (411) is used to clear the protruding portion of the conductive block when the insulating block (41) is installed. The insulating block (41) is connected to the insert (421) via the fixing foot (412).

7. A switch according to claim 6, characterized in that: The insulating block (41) and the inserting piece (421) are integrally formed.

8. The switch according to claim 4, characterized in that: The base (11) includes a partition wall (111), and a plurality of partition walls (111) are arranged in parallel and at intervals, and an installation cavity (1112) is formed on the open side of the partition wall (111) facing the base (11); the insert (421) is arranged corresponding to the side plate (31) of the arc extinguishing chamber (3), and an embedded portion (4211) arranged in a staggered manner is provided on the extended end of the insert (421), and the installation cavity (1112) is used to be embedded and matched with the bottom of the embedded portion (4211).

9. A switch according to claim 8, characterized in that: A positioning strip (43) is provided on the outer side of the insert (421), and the positioning strip (43) is arranged along the splicing direction between the base (11) and the bottom plate (12). A positioning groove (1111) is provided on the partition wall (111), and the positioning groove (1111) is inserted into and matched with the positioning strip (43).

10. The switch according to claim 8, characterized in that: The bottom plate (12) is provided with a plurality of isolation walls (121), and the isolation walls (121) are arranged corresponding to the partition walls (111). A positioning hole (122) is provided on the inner side of the isolation wall (121), and the positioning hole (122) is used for inserting the head of the embedded part (4211).

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