CN115312360A - Cut-off device - Google Patents
Cut-off device Download PDFInfo
- Publication number
- CN115312360A CN115312360A CN202210833039.6A CN202210833039A CN115312360A CN 115312360 A CN115312360 A CN 115312360A CN 202210833039 A CN202210833039 A CN 202210833039A CN 115312360 A CN115312360 A CN 115312360A
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- Prior art keywords
- cylinder
- contact
- air
- piston
- air chamber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
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- Circuit Breakers (AREA)
Abstract
The invention provides a switching-off device which comprises a fixed contact, a moving contact, a pull rod, a first cylinder, a second cylinder, an air pipe and a piston, wherein the second cylinder is fastened on a bracket; the first cylinder is sleeved in the second cylinder in an airtight manner and moves synchronously with the pull rod and the moving contact; a piston is arranged in the second cylinder; the first air chamber is formed by enclosing the first air cylinder, the second air cylinder and the piston; a second air chamber is formed between the piston and the bottom of the second air cylinder; in the brake opening process of the breaking device, the first air cylinder can contact and extrude the piston to compress the air in the second air chamber; one end of the air pipe is communicated with the second air chamber, and the other end of the air pipe is aligned to the arc area. The invention separates the moving static contact and the static contact by arranging the air chamber and skillfully utilizes the gas in the compressed air chamber to extinguish the electric arc. Realize horizontal arc extinguishing through the pipe, the effectual arc extinguishing efficiency that has improved.
Description
Technical Field
The invention relates to the field of switching on and off of high-voltage electric appliances, in particular to a switching-on and switching-off device.
Background
At the on-off in-process, after the separation between moving arc contact and quiet arc contact, owing to there is high voltage, can produce electric arc, the breaking apparatus fundamental principle of present traditional circuit breaker is through the gas in the compression cylinder, and gas passes through the spout and blows out electric arc, and gas and electric arc direction are the same, are unfavorable for lengthening electric arc, if can lengthen electric arc, improve arc resistance, strengthen the heat dissipation, can the arc extinguishing as early as possible.
The invention patent of patent document CN106710960B discloses a gas circuit breaker with enhanced insulation recovery function, wherein an expansion chamber, a plenum chamber, a main nozzle, an auxiliary nozzle, a movable side arc contact and a stationary side arc contact constitute an arc breaking core component; the arc extinguish chamber gas insulation recovery comprises an inner layer mixing area and an outer layer mixing area; insulating gas in the outer mixed area of the arc extinguish chamber is sucked into the inner mixed area of the arc extinguish chamber through the guide cylinder drainage holes, and the insulating gas and high-temperature arc gas are subjected to first-stage mixing and cooling in the area closest to the fracture; the supporting seat drainage holes suck the external insulating gas of the arc extinguish chamber into the outer layer mixing area of the arc extinguish chamber, and the external insulating gas and the arc gas are subjected to secondary mixing and cooling; the spoiler at the air outlet reduces the local speed of the discharged high-temperature mixed gas; a pressure balance hole is formed in the main contact shielding cover, so that the pressure difference between two sides of the shielding cover is reduced; the pressure balance hole is formed in the insulating cylinder, so that the gas pressure fluctuation in the insulating cylinder is reduced. The arc extinguishing area of the above scheme is also provided with the insulating cylinder, but the insulating cylinder is not sealed to form the air chamber, and the pressure balance hole 11 is arranged on the insulating cylinder 10 to form the airflow path A3. In the patent, gas is blown transversely to the arc area through the gas guide pipe.
The invention patent KR102105437B1 discloses a circuit breaker for a gas-insulated switchgear with increased electrode contact grip. This solution relates to a circuit breaker for a gas insulated switchgear, which efficiently cools arc heat occurring when contacts are opened to prevent deterioration of insulation breakdown capability of an insulating gas, and particularly, prevents a reverse flow phenomenon of insulation. The safety gas is realized by enhancing the sealing performance between the pressure chamber and the heating chamber, thereby executing a safe and stable blocking function, increasing the convenience of switching operation, realizing manual operation, improving the contact grip of finger contact and blocking the finger. The conductive failure is avoided, so that the ground gripping force of electrode contact is increased, and the risk of safety accidents is solved.
In the scheme, the arc extinguishing part comprises two gas chambers, namely the pressure chamber and the heating chamber, but the scheme is not provided with a gas guide pipe structure, and gas in the pressure chamber is not guided into an arc area through the gas guide pipe.
Patent document CN104979132B discloses a gas insulated circuit breaker, comprising: a fixed contact having a cavity formed therein; a fixed arcing contact disposed within a cavity of the fixed contact; a fixed side conductor that is provided so as to surround the fixed contact and configures a gap between the fixed side conductor and the fixed contact as a discharge path for the insulating gas; a movable contact having a cavity formed therein; the movable arc contact is arranged in the cavity of the movable contact; a movable side conductor that is provided so as to surround the movable contact and that configures a gap between the movable side conductor and the movable contact as a discharge path for the insulating gas; a first expansion part formed on the fixed-side conductor and expanding a discharge path for the insulating gas of the fixed-side conductor; and a second expanding portion that is formed on the movable side conductor and expands a discharge path for the insulating gas of the movable side conductor. The scheme is that expansion areas (135, 165) are respectively arranged on the dynamic side and the static side to achieve the effect of accelerating the discharge of insulating gas. In the proposal, the insulating gas in the second gas chamber is guided to the arc area through the gas guide tube, so as to achieve the effect of transversely blowing the arc.
Disclosure of Invention
In view of the drawbacks of the prior art, it is an object of the present invention to provide a breaking device.
The invention provides a switching-on and switching-off device, which comprises a fixed contact 2, a movable contact 3, a pull rod 13, a first cylinder 10, a second cylinder 11, an air pipe 7 and a piston 12, wherein:
the second cylinder 11 is fastened on the bracket 9;
the first cylinder 10 is sleeved in the second cylinder 11 in an airtight manner and moves synchronously with the pull rod 13 and the moving contact 3;
a piston is arranged in the second cylinder 11; a first air chamber 5 is formed by enclosing a first air cylinder 10, a second air cylinder 11 and a piston 12; a second air chamber 6 is formed between the piston 12 and the bottom of the second air cylinder 11;
during the opening process of the breaking device, the first cylinder 10 can contact and press the piston 12 to compress the gas of the second gas chamber 6;
one end of the gas pipe 7 is communicated with the second gas chamber 6, and the other end of the gas pipe is aligned with the arc area.
Preferably, the static contact 2, the movable contact 3 and the pull rod 13 are coaxially arranged; the static contact 2 is arranged on the base 1; the moving contact 3 is installed at the end of the pull rod 13, and the pull rod 13 reciprocates along the axis direction to drive the moving contact 3 to contact with or separate from the static contact 2.
Preferably, when the switch is closed, the static contact 2 extends into the first cylinder 10 and is inserted into the movable contact 3; the static contact 2, the first cylinder 10 and the second cylinder 11 enclose a sealed first air chamber 5.
Preferably, during the opening process, the gas in the first gas chamber 5 is compressed; when the stationary contact 2 is disengaged from the nozzle opening 4 of the first cylinder 10, the gas compressed in the first air chamber 5 flows out through the nozzle opening 4.
Preferably, the air outlet of the air tube 7 faces the area between the fixed contact 2 and the movable contact 3.
Preferably, the pull rod 13 passes through the first cylinder 10, has one end provided with the movable contact 3 and is arranged in the first air chamber 5, and the other end is an operation end.
Preferably, the interior of the pull rod 13 is hollow, and the pull rod 13 is provided with a through hole 14 at a side far away from the movable contact 3.
Preferably, the proximal end of the air tube 7 is communicated with the second air chamber 6 at an inclined angle.
Preferably, the static contact 2 includes a static contact chromium-copper portion 202 and a static contact copper-tungsten portion 201, where the static contact chromium-copper portion 202 is a static contact 2 body; the fixed contact copper tungsten part 201 is arranged at the end part of the fixed contact 2;
the moving contact 3 comprises a moving contact chromium-copper part 302 and a moving contact copper-tungsten part 301, wherein the moving contact chromium-copper part 302 is a moving contact 3 body; the moving contact copper-tungsten part 301 is arranged at the end part of the moving contact 3.
Preferably, the piston 12 and the tie rod 13 are connected in an airtight manner, and the second cylinder 11 and the tie rod 13 are connected in an airtight manner.
Preferably, the piston 12 is connected to the bottom of the second cylinder 11 through the spring 8, and divides the second cylinder 11 into the first air chamber 5 and the second air chamber 6.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has reasonable structure, smart design and obvious effect.
2. The invention separates the moving static contact and the static contact by arranging the air chamber and skillfully utilizes the gas in the compressed air chamber to extinguish the electric arc.
3. Compared with the traditional gas longitudinal arc extinguishing mode, the invention skillfully utilizes the guide pipe to realize transverse arc extinguishing, effectively improves the arc resistance, enhances the heat dissipation and realizes the arc extinguishing as soon as possible.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural view of a breaking device in a closing state.
Fig. 2 is a schematic structural diagram of the breaking device at a first switching-off stage.
Fig. 3 is a schematic structural diagram of the breaking device at a second switching stage.
Fig. 4 is a schematic structural diagram of the breaking device at a third switching stage.
The figures show that: 1-a base; 2, static contact; 201-stationary contact copper tungsten portion; 202-a stationary contact chrome copper portion; 3-moving contact; 301-moving contact copper tungsten part; 302-moving contact chromium copper part; 4-nozzle; 5-a first air chamber; 6-a second air chamber; 7-air pipe; 8-a spring; 9-a scaffold; 10-a first cylinder; 11-a second cylinder; 12-a piston; 13-a pull rod; 14-through hole.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1 to 4, the breaking device provided by the present invention includes a fixed contact 2, a movable contact 3, a pull rod 13, a first cylinder 10, a second cylinder 11, an air tube 7 and a piston 12, wherein: the second cylinder 11 is fastened on the bracket 9; the piston 12 is connected with the bottom of the second cylinder 11 through the spring 8, and divides the second cylinder 11 into a first air chamber 5 and a second air chamber 6; a first air chamber 5 is formed by enclosing a first air cylinder 10, a second air cylinder 11 and a piston 12; a second air chamber 6 is formed between the piston 12 and the bottom of the second air cylinder 11; the first cylinder 10 is arranged in the second cylinder 11 and synchronously moves with the pull rod 13 and the moving contact 3; the pull rod 13 penetrates through the second air chamber 6 and extends into the first air chamber 5; after the pull rod 13 moves to a certain distance, the first cylinder 10 contacts and presses the piston 12 to compress the gas in the second gas chamber 6; one end of the gas pipe 7 is communicated with the second gas chamber 6, and the other end of the gas pipe is transversely aligned with the arc area. The air outlet of the air pipe 7 is over against the area between the static contact 2 and the moving contact 3, and the air outlet direction is vertical or approximately vertical to the axial direction of the static contact 2. The near gas end of the gas pipe 7 is communicated with the second gas chamber 6 at an inclined angle, and is helpful for discharging the compressed gas.
The static contact 2, the moving contact 3 and the pull rod 13 are coaxially arranged; the static contact 2 is arranged on the base 1; the moving contact 3 is installed at the end of the pull rod 13, and the pull rod 13 reciprocates along the axis direction to drive the moving contact 3 to contact with or separate from the static contact 2. The pull rod 13 penetrates through the first cylinder 10, one end of the pull rod is provided with the movable contact 3 and is arranged in the first air chamber 5, and the other end of the pull rod is an operation end. The pull rod 13 is hollow inside, and a through hole 14 is formed in one side of the pull rod 13 far away from the movable contact 3.
When the switch is closed, the static contact 2 extends into the first cylinder 10 and is inserted into the moving contact 3; the static contact 2, the first cylinder 10 and the second cylinder 11 enclose a sealed first air chamber 5. During the opening process, the gas in the first gas chamber 5 is compressed; when the stationary contact 2 is disengaged from the nozzle opening 4 of the first cylinder 10, the gas compressed in the first air chamber 5 flows out through the nozzle opening 4.
The static contact 2 comprises a static contact chromium copper part 202 and a static contact copper tungsten part 201, wherein the static contact chromium copper part 202 is a static contact 2 body; the fixed contact copper tungsten part 201 is arranged at the end part of the fixed contact 2; the moving contact 3 comprises a moving contact chromium copper part 302 and a moving contact copper tungsten part 301, wherein the moving contact chromium copper part 302 is a moving contact 3 body; the moving contact copper-tungsten part 301 is arranged at the end part of the moving contact 3.
The piston 12 and the pull rod 13 are connected in an airtight mode, and the second cylinder 11 and the pull rod 13 are connected in an airtight mode. The first cylinder 10 and the second cylinder 11 are connected in an airtight manner. And the sealing performance is ensured.
In more detail, in the present invention, the air tube 7 is connected with the second air chamber 6, and the piston 12 in the second air chamber 6 is connected with the bracket 9 through the spring 8; when the piston 12 in the second gas chamber 6 is compressed, the gas inside can flow out along the gas pipe 7 and blow towards the arc area through the gas pipe 7; the static contact 2 is connected with the base 1; the pull rod 13 is connected with the first cylinder 10, the nozzle 4 and the moving contact 3 and can move horizontally; the bracket 9 is connected with the second cylinder 11 and is fixed in position; the first air chamber 5 is surrounded by a piston 12, a first air cylinder 10 and a second air cylinder 11 and can flow out from the nozzle 4 and the moving arc contact; the static contact 2 is composed of a static contact chromium copper part 202 and a static contact copper tungsten part 201, wherein the static contact copper tungsten part 201 is arranged at the end part; the moving contact 3 consists of a moving contact chromium copper part 302 and a moving contact copper tungsten part 301, and the moving contact copper tungsten part 301 is arranged at the end part; the pull rod 13 is hollow inside, and one end far away from the movable contact 3 is provided with a hole and can move along the horizontal direction.
The working principle of the invention is as follows: firstly, when the switch is closed, the static contact 2 is inserted into the moving contact 3, the chromium cylinder part of the static contact 2 is contacted with the chromium cylinder part of the moving contact 3, and the conductivity is good. In the process of opening the brake, as shown in fig. 2, the pull rod 13 drives the moving contact 3 to move rightwards, and the moving contact copper-tungsten portion 301 is in contact with the static contact copper-tungsten portion 201. As shown in fig. 3, the pull rod 13 continues to move rightward, the gas in the first air chamber 5 is compressed and flows out of the pull rod 13 through the nozzle 4, the first air cylinder 10 and the piston 12 are not in contact, and the piston 12 is not in position. As shown in fig. 4, when the first cylinder 10 contacts the piston 12, the piston 12 is pressed by the first cylinder 10, the spring 8 compresses, the gas in the second gas chamber 6 compresses, flows out from the gas pipe 7, blows the arc, stretches the arc downwards, lengthens the arc length, increases the arc resistance, dissipates heat, finally extinguishes, and the opening is finished. When the switch is closed, the spring 8 is restored, and the piston 12 is reset.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a cut-off device, its characterized in that includes static contact (2), moving contact (3), pull rod (13), first cylinder (10), second cylinder (11), trachea (7) and piston (12), wherein:
the second cylinder (11) is fastened on the bracket (9);
the first cylinder (10) is sleeved in the second cylinder (11) in an airtight manner and moves synchronously with the pull rod (13) and the moving contact (3);
a piston is arranged in the second cylinder (11); the first air chamber (5) is formed by enclosing the first air cylinder (10), the second air cylinder (11) and the piston (12); a second air chamber (6) is formed between the piston (12) and the bottom of the second cylinder (11);
in the brake opening process of the breaking device, the first air cylinder (10) can contact and extrude the piston (12) to compress the air in the second air chamber (6);
one end of the gas pipe (7) is communicated with the second gas chamber (6), and the other end of the gas pipe is aligned to the arc area.
2. The breaking device according to claim 1, characterized in that the stationary contact (2), the movable contact (3) and the tie rod (13) are coaxially arranged; the static contact (2) is arranged on the base (1); the moving contact (3) is arranged at the end part of the pull rod (13), and the pull rod (13) reciprocates along the axis direction to drive the moving contact (3) to be in contact with or separated from the static contact (2).
3. The breaking device according to claim 1, characterized in that, in the closed position, a stationary contact (2) extends into said first cylinder (10) and is inserted into the movable contact (3); the static contact (2), the first cylinder (10) and the second cylinder (11) enclose to form a sealed first air chamber (5).
4. A breaking device according to claim 1, characterized in that during opening, the gas in the first gas chamber (5) is compressed; when the static contact (2) is separated from the nozzle (4) of the first cylinder (10), the compressed gas in the first air chamber (5) flows out through the nozzle (4).
5. The switching device according to claim 1, characterized in that the outlet of the air duct (7) is directed towards the area between the stationary contact (2) and the movable contact (3).
6. The breaking device according to claim 1, wherein the pull rod (13) passes through the first cylinder (10) and has one end equipped with a movable contact (3) and arranged inside the first air chamber (5) and the other end being an operating end.
7. A switch-off device according to claim 1, characterized in that the interior of the tie rod (13) is hollow and that the tie rod (13) is provided with a through-hole (14) at the side remote from the movable contact (3).
8. A breaking device according to claim 1, wherein the proximal end of the air tube (7) communicates with the second air chamber (6) at an oblique angle.
9. A breaking device according to claim 1, characterized in that there is an airtight connection between the piston (12) and the tie rod (13) and between the second cylinder (11) and the tie rod (13).
10. A breaking device according to claim 1, characterized in that the piston (12) is connected to the bottom of the second cylinder (11) by means of a spring (8), dividing the second cylinder (11) into the first (5) and the second (6) air chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210833039.6A CN115312360A (en) | 2022-07-15 | 2022-07-15 | Cut-off device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210833039.6A CN115312360A (en) | 2022-07-15 | 2022-07-15 | Cut-off device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115312360A true CN115312360A (en) | 2022-11-08 |
Family
ID=83856681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210833039.6A Pending CN115312360A (en) | 2022-07-15 | 2022-07-15 | Cut-off device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115312360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117558579A (en) * | 2024-01-11 | 2024-02-13 | 宁波天安智能电网科技股份有限公司 | High-voltage arc switch and working method thereof |
-
2022
- 2022-07-15 CN CN202210833039.6A patent/CN115312360A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117558579A (en) * | 2024-01-11 | 2024-02-13 | 宁波天安智能电网科技股份有限公司 | High-voltage arc switch and working method thereof |
| CN117558579B (en) * | 2024-01-11 | 2024-03-22 | 宁波天安智能电网科技股份有限公司 | High-voltage arc switch and working method thereof |
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