CN220856379U - Contact arc extinguishing system of switch - Google Patents
Contact arc extinguishing system of switch Download PDFInfo
- Publication number
- CN220856379U CN220856379U CN202322583174.2U CN202322583174U CN220856379U CN 220856379 U CN220856379 U CN 220856379U CN 202322583174 U CN202322583174 U CN 202322583174U CN 220856379 U CN220856379 U CN 220856379U
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- contact
- arc
- moving
- movable
- main
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- 238000005192 partition Methods 0.000 claims abstract description 37
- 230000003068 static effect Effects 0.000 claims abstract description 31
- 238000010891 electric arc Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims 2
- 230000005684 electric field Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
A contact arc extinguishing system of a switch belongs to the technical field of low-voltage electrical appliances. The movable contact comprises a movable main contact blade group and at least one movable arc contact, a narrow slit is formed in one side of the movable arc contact, one end of the movable arc contact is inserted into the narrow slit and moves in the narrow slit, and the contact arc extinguishing system further comprises an insulating partition plate. The advantages are that: the arc generated between the movable arc contact and the static arc contact is surrounded by the space formed by the arc extinguishing grid sheet of the arc extinguishing chamber and the insulating partition plate and stays in the arc extinguishing chamber, and cannot drop between the movable main contact and the static main contact, the arc is effectively divided by the arc extinguishing grid sheet, the movable main contact and the static main contact cannot be ablated in a large amount, and the breaking capacity of the switch is improved.
Description
Technical Field
The utility model belongs to the technical field of piezoelectric devices, and particularly relates to a contact arc extinguishing system of a switch.
Background
The contact system is an important component of the low-voltage switch, and when fault current occurs in a circuit, a moving contact and a static contact in the contact system are rapidly separated, so that the current is disconnected. In the breaking process, voltage exists between the movable contact and the static contact, so that an air medium is discharged to generate an electric arc. The high temperature of the arc can cause burning losses to components near the contacts, and thus it is desirable to try to move the arc rapidly to where the arc chute is segmented by the arc chute to thereby reduce the arcing time.
The contacts of large-sized low-voltage switches typically have a pair of arc contacts in addition to the main contacts. The arc contacts are usually designed to be closed before the main contacts and then separated from the main contacts, so that the arc can burn on the arc contacts in the process of breaking the short-circuit current by the switch, and ablation of the main contacts is avoided. However, in the process of opening the contact, there may be a stage that the distance between the moving and static arc contacts is larger than the distance between the moving and static main contacts, that is, the electric field intensity between the moving and static main contacts is higher than the electric field intensity between the moving and static arc contacts, at this time, the arc is easily retracted between the main contacts under the influence of the electric field, so that the arc cannot be divided by the arc extinguishing grid sheet, and the main contacts are largely ablated, thereby greatly affecting the breaking capability of the switch.
In view of the above-mentioned prior art, there is a need for an improvement in the structure of the contact quenching system of the prior art switch, and for this purpose, the present inventors have advantageously devised the technical solutions described below, which are created in this context.
Disclosure of utility model
The utility model aims to provide a contact arc extinguishing system of a switch, which can prevent an electric arc from backing back to between a movable main contact and a fixed main contact, prevent the movable main contact and the fixed main contact from being ablated by the electric arc, ensure that the electric arc can be effectively divided by an arc extinguishing grid sheet and improve the breaking capacity of the switch.
The utility model aims to achieve the purpose, a contact arc extinguishing system of a switch, which comprises a moving contact, a fixed contact and an arc extinguishing chamber, wherein the moving contact comprises a moving main contact blade group and at least one moving arc contact, the arc extinguishing chamber is provided with a narrow slit facing to an opening of the moving contact on one side facing to the moving contact, and one end of the moving arc contact penetrates into the narrow slit and moves in the narrow slit, and the contact arc extinguishing system is characterized in that: the contact arc extinguishing system also comprises an insulating partition board, when the movable contact and the fixed contact are separated, the insulating partition board blocks the electric arc generated between the movable arc contact and the fixed contact and the communication outside the arc extinguishing chamber at the opening of the narrow slit.
In a specific embodiment of the present utility model, the moving main contact blade group includes a plurality of moving main contact blades, each of the moving main contact blades is separately disposed at two sides of the moving arc contact, and the moving main contact blades and the moving arc contact are arranged side by side on a moving contact rotation axis; the insulating partition plate is positioned between the movable arc contact and the fixed contact and is positioned in the same radial plane with the movable arc contact on the rotating axis of the movable contact.
In another specific embodiment of the present utility model, the fixed contact has a cavity formed at one end near the moving contact and facing the opening of the moving contact, and the insulating partition is accommodated in the cavity when the moving contact and the fixed contact are closed.
In another specific embodiment of the present utility model, the moving contact further includes a moving contact support, and the moving main contact blade set and the moving arc contact are coaxially pivoted on the moving contact support; each moving main contact blade is provided with a moving main contact, each moving arc contact is provided with a moving arc contact, and the distance between the moving arc contact and the rotating axis of the moving contact is larger than that between the moving main contact and the rotating axis of the moving contact; the static contact is provided with a static main contact and a static arc contact, the static main contact and the movable main contact are correspondingly arranged on two sides of the concave cavity, and the static arc contact and the movable arc contact are correspondingly arranged on one side of the concave cavity facing the arc extinguishing chamber and are positioned at the bottom of the narrow slit of the arc extinguishing chamber.
In still another specific embodiment of the present utility model, the moving contact support includes a pair of side plates and a bottom plate connected to the pair of side plates, the pair of side plates are separately disposed at two sides of the moving main contact blade set, the bottom plate is located at one side of the moving main contact blade set and the moving arc contact, which faces the fixed contact, and the moving main contact and the moving arc contact are located outside the bottom plate.
In a further specific embodiment of the present utility model, the insulating partition is fixed on the bottom plate, the upper end of the insulating partition in the height direction of the arc extinguishing chamber extends toward the moving arc contact, the lower end of the insulating partition in the height direction of the arc extinguishing chamber extends toward the cavity, and the front end of the insulating partition in the arc traveling direction extends into the narrow slit.
In a further specific embodiment of the present utility model, the insulating spacer is integrally formed with the base plate.
In a further specific embodiment of the present utility model, the insulating partition is fixed on the moving arc contact, the lower end of the insulating partition in the height direction of the arc extinguishing chamber extends toward the cavity, and the front end of the insulating partition in the arc traveling direction extends into the narrow slit.
Compared with the prior art, the utility model has the beneficial effects that as the insulating partition plate is additionally arranged: the arc generated between the movable arc contact and the static arc contact is surrounded by the space formed by the arc-extinguishing grid sheet of the arc-extinguishing chamber and the insulating partition plate and stays in the arc-extinguishing chamber, and cannot retreat between the movable main contact and the static main contact, so that the movable main contact and the static main contact cannot be ablated by the arc, favorable conditions are provided for effectively dividing the arc by the arc-extinguishing grid sheet, and the breaking capacity of the switch is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic diagram of the cooperation of the movable and stationary contacts according to the present utility model;
FIG. 4 is a side view of FIG. 3;
fig. 5 is a schematic diagram of the cooperation between the stationary contact and the arc extinguishing chamber according to the present utility model.
In the figure: 1. the movable contact comprises a movable contact, a movable main contact blade group 11, a movable main contact, a movable arc contact 12, a movable arc contact 121, a movable contact bracket 13, a side plate 131, a side plate 132, a bottom plate 133 and a first shaft; 2. the static contact, 20, the concave cavity, 21, the static main contact, 22, the static arc contact; 3. arc extinguishing chamber 31, narrow slit 311, opening; 4. an insulating separator.
Detailed Description
The following detailed description of specific embodiments of the utility model, while given in connection with the accompanying drawings, is not intended to limit the scope of the utility model, and any changes that may be made in the form of the inventive concepts described herein, without departing from the spirit and scope of the utility model.
In the following description, all concepts related to the directions (or azimuths) of up, down, left, right, front and rear are directed to the position states where the drawings are being described, so as to facilitate public understanding, and thus should not be construed as being particularly limiting to the technical solutions provided by the present utility model.
Referring to fig. 1 to 4, the present utility model relates to a contact arc extinguishing system of a switch, which comprises a moving contact 1, a fixed contact 2 and an arc extinguishing chamber 3. The movable contact 1 comprises a movable main contact blade group 11, at least one movable arc contact 12 and a movable contact bracket 13 for supporting the movable main contact blade group 11 and the movable arc contact 12. The movable contact support 13 is pivoted on a base (known technology, not shown) of the switch through a first shaft 133, the operating mechanism drives the movable contact support 13 to rotate around the first shaft 133 through a connecting rod, and a straight line where the first shaft 133 is located is formed as a movable contact rotation axis. The moving main contact blade set 11 and the moving arc contact 12 are both pivoted on the moving contact support 13 through a second shaft (known technology, not shown) and rotate together with the moving contact support 13, thereby realizing the separation or closing with the fixed contact 2. The moving contact bracket 13 is composed of a pair of side plates 131 and a bottom plate 132 connected with the pair of side plates 131, the pair of side plates 131 are respectively arranged at two sides of the moving main contact blade group 11, and the bottom plate 132 is positioned at one side of the moving main contact blade group 11 and the moving arc contact 12, which faces the fixed contact 2.
As shown in fig. 1 and 5, the arc extinguishing chamber 3 is formed by longitudinally stacking a plurality of arc extinguishing grid plates in a U shape, and a pair of grid plate legs of the arc extinguishing grid plates are arranged towards the movable contact 1. After the plurality of arc extinguishing bars are stacked, a narrow slit 31 is formed in the region between a pair of bar legs of the arc extinguishing bars. One end of the movable arc contact 12 is inserted into the narrow slit 31 and moves up and down along the narrow slit 31. The fixed contact 2 is arranged below the arc extinguishing chamber 3 and one end of the fixed contact protrudes out of the narrow slit 31. The fixed contact 2 is formed with a concave cavity 20 which is open towards the moving contact 1 at one end close to the moving contact 1.
The utility model is improved in that the utility model also comprises an insulating partition board 4, wherein the insulating partition board 4 is positioned between the moving arc contact 12 and the fixed contact 2, and the insulating partition board 4 and the moving arc contact 12 are positioned in the same radial plane on the rotating axis of the moving contact. When the movable contact 1 and the fixed contact 2 are separated, the insulating partition board 4 blocks the electric arc generated between the movable arc contact 12 and the fixed contact 2 and the communication outside the arc extinguishing chamber 3 at the opening 311 of the narrow slit 31. When the movable contact 1 and the fixed contact 2 are closed, the insulating partition board 4 is accommodated in the concave cavity 20 of the fixed contact 2.
With continued reference to fig. 1 to 4, the moving main contact blade set 11 includes a plurality of moving main contact blades, each of which is disposed on two sides of the moving arcing contact 12, and is arranged side by side with the moving arcing contact 12 on the moving contact rotation axis. Each moving main contact blade is provided with a moving main contact 111, the moving arc contact 12 is provided with a moving arc contact 121, and the moving main contact 111 and the moving arc contact 121 are positioned outside the bottom plate 132 and matched with the fixed contact 2. The distance between the movable arc contact 121 and the movable contact rotation axis is greater than the distance between the movable main contact 111 and the movable contact rotation axis. The static contact 2 is provided with a static main contact 21 and a static arc contact 22, the static main contact 21 and the movable main contact 111 are correspondingly arranged on two sides of the concave cavity 20, and the static arc contact 22 and the movable arc contact 121 are correspondingly arranged on one side of the concave cavity 20 facing the arc extinguishing chamber 3 and are arranged at the bottom of the narrow slit 31 of the arc extinguishing chamber 3.
The insulating partition board 4 is fixed on the bottom board 132, the upper end of the insulating partition board 4 in the height direction of the arc extinguishing chamber 3 extends towards the movable arc contact 12, the lower end of the insulating partition board 4 in the height direction of the arc extinguishing chamber 3 extends towards the concave cavity 20, and the front end of the insulating partition board 4 in the arc advancing direction extends into the narrow slit 31. The insulating partition board 4 and the bottom plate 132 may be an integrally formed structure.
Besides the above, the insulating partition board 4 may be fixed on the moving arc contact 12, the lower end of the insulating partition board 4 in the height direction of the arc extinguishing chamber 3 extends toward the cavity 20, and the front end of the insulating partition board 4 in the arc advancing direction extends into the narrow slit 31.
When short-circuit current occurs in the circuit, the movable contact 1 and the fixed contact 2 are opened, wherein the movable main contact 111 and the fixed main contact 21 are separated before the movable arc contact 121 and the fixed arc contact 22, and an arc is generated between the movable arc contact 121 and the fixed arc contact 22. When the movable contact 1 and the fixed contact 2 are opened for a certain distance, the distance D1 between the movable main contact 111 and the fixed main contact 21 is smaller than the distance D2 between the movable arc contact 121 and the fixed arc contact 22 (as shown in fig. 4), the electric arc is influenced by an electric field and tends to move towards the movable main contact 111 and the fixed main contact 21, and due to the existence of the insulating partition plate 4, the electric arc is surrounded by a space formed by the arc extinguishing grid sheet and the insulating partition plate 4, namely is limited in the narrow slit 31 of the arc extinguishing chamber 3 and cannot fall back to the position between the movable main contact 111 and the fixed main contact 21 from the opening 311 of the narrow slit 31, but stays in the arc extinguishing chamber 3.
Claims (8)
1. The utility model provides a contact arc extinguishing system of switch, includes moving contact (1), static contact (2) and explosion chamber (3), moving contact (1) include moving main contact blade group (11) and at least one moving arc contact (12), explosion chamber (3) be equipped with one in one side towards moving contact (1) open-ended slot (31), one end of moving arc contact (12) visit into this slot (31) and at slot (31) internal motion, its characterized in that: the contact arc extinguishing system also comprises an insulating partition board (4), when the movable contact (1) and the fixed contact (2) are separated, the insulating partition board (4) blocks the electric arc generated between the movable arc contact (12) and the fixed contact (2) and the communication outside the arc extinguishing chamber (3) at the opening (311) of the narrow slit (31).
2. The contact arc extinguishing system of a switch according to claim 1, characterized in that the moving main contact blade group (11) comprises a plurality of moving main contact blades, each moving main contact blade is separately arranged at both sides of the moving arc contact (12), and is arranged side by side with the moving arc contact (12) on the moving contact rotation axis; the insulating partition board (4) is positioned between the movable arc contact (12) and the fixed contact (2), and is positioned in the same radial plane as the movable arc contact (12) on the rotating axis of the movable contact.
3. A contact extinguishing system of a switch according to claim 2, characterized in that the stationary contact (2) is formed with a cavity (20) opening towards the moving contact (1) at one end close to the moving contact (1), and that the insulating partition (4) is accommodated in the cavity (20) when the moving contact (1) and the stationary contact (2) are closed.
4. A contact quenching system of a switch according to claim 3, characterized in that the moving contact (1) further comprises a moving contact support (13), the moving main contact blade group (11) and the moving arc contact (12) being coaxially pivoted on the moving contact support (13); each moving main contact blade is provided with a moving main contact (111), each moving arc contact (12) is provided with a moving arc contact (121), and the distance between the moving arc contact (121) and the moving contact rotation axis is larger than that between the moving main contact (111) and the moving contact rotation axis; the static contact (2) is provided with a static main contact (21) and a static arc contact (22), the static main contact (21) and the movable main contact (111) are correspondingly arranged on two sides of the concave cavity (20) in a separated mode, and the static arc contact (22) and the movable arc contact (121) are correspondingly arranged on one side, facing the arc extinguishing chamber (3), of the concave cavity (20) and are positioned at the bottom of a narrow slit (31) of the arc extinguishing chamber (3).
5. The contact arc extinguishing system of a switch according to claim 4, wherein the movable contact support (13) comprises a pair of side plates (131) and a bottom plate (132) connected with the pair of side plates (131), the pair of side plates (131) are separately arranged at two sides of the movable main contact blade group (11), the bottom plate (132) is positioned at one side of the movable main contact blade group (11) and the movable arc contact (12) facing the fixed contact (2), and the movable main contact (111) and the movable arc contact (121) are positioned outside the bottom plate (132).
6. A contact quenching system for a switch as claimed in claim 5, wherein said insulating spacer (4) is fixed to said base plate (132), an upper end of said insulating spacer (4) in a height direction of said arc extinguishing chamber (3) extends toward said moving arc contact (12), and a lower end in a height direction of said arc extinguishing chamber (3) extends toward said cavity (20), and a front end of said insulating spacer (4) in an arc traveling direction extends into said slit (31).
7. The contact quenching system as claimed in claim 6, wherein said insulating spacer (4) is integrally formed with the base plate (132).
8. A contact quenching system as claimed in claim 4, characterized in that the insulating partition (4) is fixed to the movable arcing contact (12), the lower end of the insulating partition (4) in the height direction of the arc extinguishing chamber (3) extends toward the cavity (20), and the front end of the insulating partition (4) in the arc advancing direction extends into the slit (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322583174.2U CN220856379U (en) | 2023-09-22 | 2023-09-22 | Contact arc extinguishing system of switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322583174.2U CN220856379U (en) | 2023-09-22 | 2023-09-22 | Contact arc extinguishing system of switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220856379U true CN220856379U (en) | 2024-04-26 |
Family
ID=90745471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322583174.2U Active CN220856379U (en) | 2023-09-22 | 2023-09-22 | Contact arc extinguishing system of switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220856379U (en) |
-
2023
- 2023-09-22 CN CN202322583174.2U patent/CN220856379U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |