Switch with improved structure

Abstract

A switch with an improved structure belongs to the technical field of low-voltage apparatuses. Comprising a contact system and an arc extinguish chamber, the arc extinguish chamber is located in the opening direction of the contact system, the contact system comprises a moving contact and a static contact, the static contact comprises a conductive block, an arc striking sheet and a liner, the arc striking sheet and the liner are installed on the conductive block, the liner surrounds the arc striking sheet, and the arc striking sheet is arranged on the conductive block. The arc striking piece is characterized in that a pair of insulating blocks is further installed on the conductive block and located on the left outer side and the right outer side of the arc striking piece respectively. The static contact has the advantages that the insulating blocks are fixedly mounted on the static contact and are arranged on the two sides of the arc striking sheet on the static contact, so that after the space on the two sides of the arc striking sheet is occupied, the upward movement of the arc is facilitated; and the insulating gas released by the insulating block is positioned near the static contact, so that the reignition of the electric arc at the contact can be prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a switch with an improved structure. 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 chamber, the gas-generating insulator is heated, absorbing the arc energy. Simultaneously, the insulating gas released from the gas-generating insulator accelerates arc extinguishing. However, because the gas-generating insulator is typically not designed to coordinate 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 task of the utility model is to provide a switch with an improved structure, which is installed and fixed on the static contact with an insulating block. The insulating block is arranged on both sides of the arc-striking piece on the static contact, so that the space on both sides of the arc-striking piece is occupied, which is conducive to the upward movement of the arc; at the same time, it can prevent the contact from reigniting.

[0005] The task of the utility model is accomplished in this way: a switch with an improved structure includes a contact system and an arc extinguishing chamber, the arc extinguishing chamber is located in the opening direction of the contact system, the contact system includes a moving contact and 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 a pair of insulating blocks are also installed on the conductive block, and the pair of insulating blocks are respectively located on the left and right sides of the arc-striking piece.

[0006] In a specific embodiment of the present invention, a pair of insulating blocks are arranged separately.

[0007] In another specific embodiment of the present invention, the insulating block includes an insulating block body and a cover plate; an end surface of the opening of the insulating block body is closed by the cover plate.

[0008] In another specific embodiment of the present invention, the insulating block further includes a bridge portion, and the bridge portion connects a pair of the insulating blocks into one.

[0009] In another specific embodiment of the present invention, the bridge portion is a flat sheet, which is located below the connecting portion of the arc-starting sheet.

[0010] In another specific embodiment of the present invention, a gasket is further provided on the static contact, and the gasket surrounds the arc-striking piece on three sides from the left and right sides and the extended end of the arc-striking piece; the arc-striking piece includes a fixed end, an extended head and a connecting part, the fixed end is used to be fixed to the conductive block, the extended head is located on the extended end of the arc-striking piece and is arranged parallel to the gasket, and the connecting part connects the fixed end and the extended head.

[0011] In a further specific embodiment of the present invention, a gap is provided between the insulating block and the gasket.

[0012] In a more specific embodiment of the present invention, the liner is provided with an opening and a cavity, the opening leaves the insulating block, and the extended head portion is embedded in the cavity on the liner and pressed on the liner.

[0013] In yet another specific embodiment of the present invention, a narrowing section is provided on the connecting portion, the width of the narrowing section gradually narrows in the extension direction of the arc-striking piece, and both sides of the narrowing section constitute inward inclined surfaces; the opposite sides of a pair of insulating blocks form mating surfaces, and the mating surfaces match the inclined surfaces on both sides of the narrowing section.

[0014] In yet another specific embodiment of the present invention, the insulating block is made of a gas-generating material.

[0015] The utility model adopts the above structure, which has the beneficial effects: the insulating block is installed and fixed on the static contact, and the insulating block is arranged on both sides of the arc-striking piece on the static contact. After the space on both sides of the arc-striking piece is occupied, it is beneficial for the arc to move upward; at the same time, the insulating gas released by the insulating block is located near the static contact, which can prevent the arc from reigniting at the contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a first embodiment of the cooperation between the static contact and the arc extinguishing chamber of the utility model;

[0017] Figure 2 This is a perspective schematic diagram of a first embodiment of the static contact and insulating block of the utility model;

[0018] Figure 3This is a side view of a first embodiment of the static contact and insulating block of the utility model;

[0019] Figure 4 This is an exploded schematic diagram of a first embodiment of the static contact and insulating block of the utility model;

[0020] Figure 5 This is a perspective schematic diagram of a first embodiment of the insulating block body of the present invention;

[0021] Figure 6 This is a perspective schematic diagram of a first embodiment of the cover of the insulating block of the present invention;

[0022] Figure 7 This is an exploded schematic diagram of a second embodiment of the static contact and the insulating block of the present invention;

[0023] Figure 8 This is a front perspective schematic diagram of a second embodiment of the insulating block of the present invention;

[0024] Figure 9 This is a back perspective schematic diagram of the second embodiment of the insulating block of the present invention.

[0025] In the figure: 1. Static contact, 11. Arc-starting plate, 111. Fixed end, 112. Extended head, 113. Connecting portion, 12. Static contact, 13. Gasket, 131. Clearance hole, 132. Cavity, 14. Positioning pit, 141. Screw hole; 2. Arc extinguishing chamber, 21. Side wall, 22. Grid, 23. Arc extinguishing chamber cover; 3. Insulating block, 31. Insulating block body, 311. Bottom, 3111. Mating hole, 312. Cofferdam, 313. Reinforcing rib, 314. Hook, 32. Cover, 321. Clamping platform, 33. Bridge, 331. Mounting hole, 34. Hollow hole; 100. Mating surface. 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 、 2The switch includes a contact system and an arc extinguishing chamber 2. The arc extinguishing chamber 2 is located in the opening direction of the contact system. The contact system includes a moving contact and a stationary contact 1. After the moving contact swings, it contacts or separates with the stationary contact 1, thereby connecting or disconnecting the switch.

[0029] The static contact 1 includes a conductive block, an arc-striking piece 11 mounted on the conductive block, and a static contact 12. The static contact 12 is located on the side of the arc-striking piece 11 away from the arc-extinguishing chamber 2. Alternatively, the arc-striking piece 11 is located on the side of the static contact 12 closer to the arc-extinguishing chamber 2. One end of the arc-striking piece 11 is fixed to the conductive block, and the other end extends toward the arc-extinguishing chamber 2.

[0030] The arc extinguishing chamber 2 includes a pair of side walls 21, grid plates 22 installed between the pair of side walls 21 and arranged in an array, and an arc extinguishing chamber cover 23 located above the grid plates 22. The arc striker 11 extends to one side of the grid plates 22 in the array to guide the arc into the arc extinguishing chamber 2.

[0031] A pair of insulating blocks 3 are provided on either side of the arc-striking plate 11. The insulating blocks 3 are made of insulating material. The insulating blocks 3 are located on the left and right sides of the arc-striking plate 11, respectively. In this embodiment, the insulating blocks 3 are provided separately, that is, as two independent parts.

[0032] A gasket 13 is also provided on the stationary contact 1, surrounding the arc-striking piece 11. Specifically, the gasket 13 surrounds the arc-striking piece 11 on three sides, including the left and right sides and the extended end. The gasket 13 is located between the conductive block of the stationary contact 1 and the arc-striking piece 11. Specifically, the extended end of the arc-striking piece 11 is partially embedded in the gasket 13, and the gasket 13 covers part of the outer edge plane of the conductive block.

[0033] The insulating block 3 is fixedly mounted on the conductive block of the static contact 1 and is spaced apart from the gasket 13 .

[0034] like Figure 2 、 Figure 3 、 Figure 4 The arc-striking piece 11 includes a fixed end 111, an extended head 112, and a connecting portion 113. The fixed end 111 is used to fix to the conductive block, usually by riveting. The extended head 112 is located on the extended end of the arc-striking piece 11, has a rectangular shape, and is arranged parallel to the liner 13. The liner 13 is provided with a clearance hole 131 and a cavity 132. The clearance hole 131 clears the insulating block 3. The extended head 112 is partially embedded in the cavity 132 on the liner 13 and presses on the liner 13.

[0035] The connecting portion 113 connects the fixed end 111 and the extended head 112. Specifically, the connecting portion 113 protrudes away from the static contact 1, or bulges.

[0036] A narrowing section is provided on the connecting portion 113. Since the width of the fixed end 111 is greater than the width of the extended head 112, and the width of the narrowing section gradually narrows in the extending direction of the arc-starting piece 11, a gradual transition is formed from the fixed end 111 to the extended head 112.

[0037] Preferably, both sides of the narrowed section form inwardly inclined surfaces. The insulating blocks 3 are located on both sides of the narrowed section.

[0038] like Figure 4 、 Figure 5 、 Figure 6 The insulating block 3 is a split structure, comprising an insulating block body 31 and a cover plate 32. To facilitate manufacturing, the insulating block 3 is a split structure. The insulating block body 31 is a hollow five-sided structure, with one open end face sealed by the cover plate 32.

[0039] The insulating block body 31 is fixed to the conductive block by a screw, and the cover plate 32 is mounted on the opening of the insulating block body 31 by snapping.

[0040] More specifically, in order to improve the installation and positioning effect of the insulating block 3 and the conductive block, a positioning pit 14 and a threaded hole 141 are also provided on the conductive block. The threaded hole 141 is used to achieve threaded cooperation with the screw for installing the insulating block body 31, and the positioning pit 14 is used to be embedded and cooperated with the installation surface of the insulating block body 31 to achieve a positioning effect.

[0041] The insulating block body 31 includes a bottom 311 and a cofferdam 312. The cofferdam 312 surrounds the bottom 311 to form a five-sided structure with open ends. The outer side of the bottom 311 is the installation surface of the insulating block body 31.

[0042] The pair of insulating blocks 3 have mating surfaces 100 formed on opposing sides. These mating surfaces 100 are inclined or curved. Preferably, the mating surfaces 100 match the inclined surfaces on either side of the narrowing section. An upwardly narrowing airway is formed between the mating surfaces 100, facilitating increased airflow velocity.

[0043] To enhance the strength of the insulating block body 31, reinforcing ribs 313 are provided internally, and multiple hooks 314 are formed on the inner edge of the open end. Correspondingly, multiple latches 321 are formed on the outer edge of the cover plate 32, with the latches 314 corresponding to the latches 321. In this embodiment, three pairs are shown. The bottom 311 also has mating holes 3111, which are designed to abut against the heads of screws.

[0044] Since a pair of insulating blocks 3 are provided on both sides of the arc-striking plate 11, the insulating blocks 3 can occupy the space on both sides of the arc-striking plate 11, so that the arc cannot move laterally when moving on the arc-striking plate 11; and since the insulating blocks 3 occupy the space, the space is reduced, so that the arc is subjected to a greater upward aerodynamic thrust in a small space.

[0045] Preferably, the insulating block 3 is made of a gas-generating material, and the insulating gas released by the insulating block 3 remains near the arc striking piece 11 and the static contact 12, thereby preventing the arc from reigniting at the contact. Example 2

[0046] like Figure 7 、 Figure 8 、 Figure 9 FIG. 2 is a schematic diagram of a second embodiment.

[0047] This embodiment differs from the first embodiment in that the insulating block 3 is a single component and further includes a bridge portion 33, which connects the pair of insulating blocks 3 into a single component. Preferably, the bridge portion 33 is a flat sheet located below the connecting portion 113 of the arc-starting plate 11, specifically below the protruding portion of the connecting portion 113.

[0048] In order to realize the installation of the insulating block 3 and the conductive block, a mounting hole 331 is also opened on the bridge part 33, and a screw is screwed into the conductive block through the mounting hole 331, thereby completing the fixation of the bridge part 33 and the conductive block, and further completing the installation and fixation between the insulating block 3 and the conductive block.

[0049] In order to facilitate manufacturing, a hollow hole 34 is provided on a side of the insulating block 3 close to the conductive block.

[0050] Since the pair of insulating blocks 3 are connected as one part via the bridge portion 33 , the number of parts can be reduced and assembly can be simplified.

Claims

1. A switch with an improved structure, comprising a contact system and an arc extinguishing chamber (2), wherein the arc extinguishing chamber (2) is located in the opening direction of the contact system, the contact system comprises a movable contact and a stationary contact (1), the stationary contact (1) comprises a conductive block and an arc striking piece (11) mounted on the conductive block, the arc striking piece (11) extending toward the arc extinguishing chamber (2), and is characterized in that: A pair of insulating blocks (3) are also installed on the conductive block, and the pair of insulating blocks (3) are respectively located on the left and right sides of the arc-starting piece (11).

2. A switch with an improved structure according to claim 1, characterized in that: A pair of insulating blocks (3) are separately arranged.

3. The switch with improved structure according to claim 2, characterized in that: The insulating block (3) comprises an insulating block body (31) and a cover plate (32); an open end surface of the insulating block body (31) is closed by the cover plate (32).

4. The switch with improved structure according to claim 1, characterized in that: The insulating block (3) further comprises a bridge portion (33), and the bridge portion (33) connects a pair of the insulating blocks (3) into one body.

5. The switch with improved structure according to claim 4, characterized in that: The bridge portion (33) is a flat sheet, which is located below the connecting portion (113) of the arc-starting sheet (11).

6. The switch with improved structure according to claim 1, characterized in that: A gasket (13) is also provided on the static contact (1), and the gasket (13) surrounds the arc-striking piece (11) on three sides from the left and right sides and the extended end of the arc-striking piece (11); the arc-striking piece (11) includes a fixed end (111), an extended head (112) and a connecting portion (113), the fixed end (111) is used to be fixed to the conductive block, the extended head (112) is located on the extended end of the arc-striking piece (11) and is arranged parallel to the gasket (13), and the connecting portion (113) connects the fixed end (111) and the extended head (112).

7. The switch with improved structure according to claim 6, characterized in that: A gap is provided between the insulating block (3) and the gasket (13).

8. The switch with improved structure according to claim 6, characterized in that: The liner (13) is provided with a clearance hole (131) and a concave cavity (132), the clearance hole (131) clears the insulating block (3), and the extended head (112) is partially embedded in the concave cavity (132) on the liner (13) and pressed on the liner (13).

9. The switch with improved structure according to claim 6, characterized in that: A narrowing section is provided on the connecting portion (113), the width of the narrowing section gradually narrows in the extension direction of the arc-starting piece (11), and both sides of the narrowing section constitute inwardly inclined surfaces; a pair of insulating blocks (3) form matching surfaces (100) on opposite sides, and the matching surfaces (100) match the inclined surfaces on both sides of the narrowing section.

10. The switch with improved structure according to claim 1, characterized in that: The insulating block (3) is made of gas-generating material.

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