CN116364468A - Vacuum circuit breaker structure under high gas pressure - Google Patents
Vacuum circuit breaker structure under high gas pressure Download PDFInfo
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- CN116364468A CN116364468A CN202310206797.XA CN202310206797A CN116364468A CN 116364468 A CN116364468 A CN 116364468A CN 202310206797 A CN202310206797 A CN 202310206797A CN 116364468 A CN116364468 A CN 116364468A
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- cavity
- pressure
- gas pressure
- circuit breaker
- corrugated pipe
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention discloses a vacuum circuit breaker structure under high gas pressure, which comprises a first cavity, a second cavity and a vacuum cavity, wherein the first cavity, the second cavity and the vacuum cavity are combined with each other to play a role, the pressure difference between the inside and the outside is controlled to be smaller than the maximum bearing pressure, the service life of the corrugated pipe is effectively ensured, the mechanical life of the circuit breaker is further ensured, the second cavity with the second-level pressure difference is established, the gas pressure and the insulation capacity in an insulation cylinder are improved, the size of an insulating part is effectively reduced, the size of the circuit breaker is further reduced, the movable end part of the circuit breaker is separated from a cabin, the pressure of the insulating gas in the insulation cylinder is improved while the pressure resistance of the corrugated pipe is controlled, the insulation capacity is improved, the safe insulation distance is shortened, the whole size of the circuit breaker is reduced, and the application scene of space limitation is met.
Description
Technical Field
The invention relates to the field of vacuum circuit breakers, in particular to a vacuum circuit breaker structure under high gas pressure.
Background
The high-voltage vacuum circuit breaker is one of important switching equipment in a power system, and becomes a hot spot for domestic and foreign research by virtue of the advantages of small volume, simple structure and friendly arc extinguishing medium environment.
At present, external insulation of the tank type rapid vacuum circuit breaker under high voltage level is usually realized by high-pressure gas, such as sulfur hexafluoride, dry air and the like. The bellows is used as a part with sealing function in the vacuum arc-extinguishing chamber, two ends of the bellows are usually connected with the outer part of the movable conducting rod and the inner opening of the movable end cover plate respectively, when the vacuum circuit breaker performs opening and closing movement, the bellows can stretch and retract along with the movable conducting rod, and meanwhile, the bellows is often the part with the minimum mechanical life in the vacuum arc-extinguishing chamber, so that the life of the bellows often determines the life of the vacuum arc-extinguishing chamber. When the tank type rapid vacuum circuit breaker is externally insulated by high-pressure gas, the pressure difference between the inner side and the outer side of the corrugated pipe is extremely large, so that the fatigue damage of the corrugated pipe is aggravated, the vacuum arc-extinguishing chamber is disabled, and the continuous work cannot be performed. It is common practice to build a low pressure air chamber at the moving end of the circuit breaker to control the withstand pressure of the bellows.
The chinese patent publication No. CN112154582B discloses a gas-insulated switchgear comprising, inside a pressure tank: the vacuum valve is provided with a movable contact and a fixed contact in vacuum, the movable contact is arranged on one side of the movable conductor, and the fixed contact is arranged on the fixed conductor; an insulating rod connected to the other side of the movable conductor led out from the vacuum valve via the bellows; an operation rod connecting an operation device outside the pressure tank with the insulation rod; an airtight container accommodating the insulating rod, the other side of the movable conductor, and the operating rod; and an intermediate pressure chamber formed by communicating the bellows and the inner space of the airtight container, wherein a sliding contact member is provided on the other side of the movable conductor, and the sliding contact member is connected to a main circuit conductor provided in the pressure tank via the airtight container and communicates the inside of the airtight container through a communication portion provided between the sliding contact member and the airtight container.
Another example is that chinese patent publication No. CN102360987B discloses a tank type high voltage vacuum circuit breaker, which overcomes the problems that the manufacturing process is complex, the arc-extinguishing chamber cannot be replaced independently, and the vacuum arc-extinguishing chamber is directly installed in high pressure insulating gas, and the bearing pressure of the vacuum arc-extinguishing chamber is very high, and is characterized in that the cavity between the vacuum arc-extinguishing chamber and the large insulating cylinder and the cavity between the small insulating cylinder and the operating insulating rod are communicated to form a sealed low pressure gas compartment, the cavity between the large insulating cylinder and the small insulating cylinder and the tank body forms a sealed high pressure gas compartment, and 0-0.1 MPa of dry air or nitrogen is filled in the low pressure gas compartment, and 0.15-0.6 MPa of dry air or nitrogen is filled in the high pressure gas compartment.
The moving contact of the circuit breaker reciprocates under the drive of the mechanism, the speed is up to 4m/s, the service life is longer than 1 ten thousand times, the gas leakage rate is smaller than 1X10e-9Pa.m3/s, and maintenance is required to be free in the service life. In response to the high-requirement reciprocating motion, the movable seal among the cavities of the movable end of the circuit breaker adopts a corrugated pipe as the optimal choice, and Chinese patent publication No. CN112366113B discloses a protection structure and a working method of the corrugated pipe of the vacuum arc-extinguishing chamber under high gas pressure, wherein the protection structure comprises a conductive seat, a fixed screw, a connecting screw, an O-shaped ring, a conductive spring, a static corrugated pipe and connecting flanges welded at the upper end and the lower end of the static corrugated pipe; according to the invention, through the arrangement of the sealing structure of the static corrugated pipe, the structure of the arc-extinguishing chamber corrugated pipe for the tank type rapid vacuum circuit breaker for bearing the gas pressure is changed into a secondary air chamber structure, so that the pressure difference of insulating gas borne by two sides of the arc-extinguishing chamber corrugated pipe is reduced to be one atmospheric pressure difference, and the mechanical life of the vacuum arc-extinguishing chamber corrugated pipe can be effectively prolonged.
In summary, the structure of the existing vacuum circuit breaker has a plurality of defects, which are summarized as follows:
(1) the Chinese patent with publication number CN112154582B, CN102360987B, the moving end of the breaker established in the two is sealed in a single cavity, is limited by the maximum tolerance air pressure of a corrugated pipe, has low air pressure in the cavity and weak insulating property, requires long safe insulating distance, and is large in switch size, so that the circuit breaker is not suitable for space-limited scenes, such as in an offshore wind power tower;
(2) the radial O-shaped ring sealing scheme adopted by the Chinese patent with the publication number of CN112366113B is difficult in terms of speed, service life and airtightness, and has high requirements on materials and processing technology and high processing cost; the O-shaped ring sealing scheme has small fit clearance, and friction damage caused by radial runout in the motion process of the circuit breaker cannot be eliminated.
(3) When the tank type quick vacuum circuit breaker is externally insulated and adopts high-pressure gas, the inside and outside two sides of the corrugated pipe have extremely large pressure difference, so that the fatigue damage of the corrugated pipe is aggravated, the vacuum arc-extinguishing chamber is further disabled, the continuous work cannot be carried out, the common practice is to establish a low-pressure air chamber at the movable end of the circuit breaker, the tolerance air pressure of the corrugated pipe is controlled, and the effect is poor.
Disclosure of Invention
The invention provides a vacuum circuit breaker structure under high gas pressure to solve the problems.
In order to achieve the above object, the present invention is achieved by the following technical scheme.
The utility model provides a vacuum circuit breaker structure under high gas pressure, includes first cavity, second cavity, vacuum chamber, first cavity includes first bellows, moves the terminal surface, is qualified for the next round of competitions the conducting seat, moves the conducting rod, be equipped with first bellows between first cavity and the vacuum chamber, the second cavity includes second bellows, insulating cylinder, jar body top cap, be equipped with the second bellows between second cavity and the first cavity, still be equipped with the self-sealing valve on first cavity and the second cavity respectively, control bellows bears inside and outside differential pressure and is less than maximum bearing pressure, effectively guarantees bellows life, and then guarantees the mechanical life of circuit breaker, through the second cavity that establishes second differential pressure, has promoted the gas pressure and the insulating ability in the insulating cylinder, effectively reduces the insulating piece size, and then reduces the circuit breaker size.
Preferably, two ends of the first corrugated pipe are welded on the movable conducting rod and the movable end face respectively, the first cavity is filled with low pressure of 0.1-0.25MPa through the self-sealing valve, high pressure gas is isolated from the first corrugated pipe, the first corrugated pipe is protected, the first corrugated pipe and the second corrugated pipe synchronously stretch and retract when the circuit breaker is assembled, the volume change of the first cavity is small, and the relative constant of the pressure is maintained.
Preferably, the movable end face is provided with an outgoing line conducting seat, the plane is sealed through an axial sealing ring, and the outgoing line conducting seat is also provided with a self-sealing valve.
Preferably, a spring contact finger is sleeved in the outgoing line conducting seat, and an inner ring of the spring contact finger is contacted with the movable conducting rod.
Preferably, the outgoing line conducting seat is also connected with an insulating cylinder through bolts, and a flange of the second corrugated pipe is pressed between the outgoing line conducting seat and the insulating cylinder through bolts.
Preferably, axial sealing rings are respectively pressed between the two sides of the flange of the second corrugated pipe and the upper and lower parts, the air pressure of the second cavity can be increased on the basis of the air pressure of the first cavity, and the pressure difference is smaller than the maximum tolerance pressure of the second corrugated pipe, so that the high air pressure in the second cavity and high insulation performance are realized, and the air pressure difference in the second cavity (0.5 MPa maximum) is larger than the maximum tolerance pressure of the corrugated pipe because the air pressure difference in the second cavity is higher than the maximum tolerance pressure of the corrugated pipe, so that a connecting mode of reciprocating motion is not adopted between the contact spring assembly and the circuit breaker mechanism, and the magnetic fluid rotary sealing technology with mature technology is adopted.
Preferably, an external screw is arranged at the end part of the second corrugated pipe and is in threaded connection with the movable conducting rod.
Preferably, the second corrugated pipe is internally provided with a hexagonal screw column which is screwed and fixed with the insulating pull rod, and the insulating pull rod is provided with a contact spring component which is sleeved and embedded with the cam.
Preferably, the cam shaft and the insulating cylinder on the cam are subjected to external rotary dynamic sealing through the magnetic fluid rotary sealing device.
Preferably, a tank top cover is arranged on the insulating cylinder and is subjected to plane sealing through an axial sealing ring, and the tank top cover is provided with a self-sealing valve.
Compared with the prior art, the invention discloses a vacuum circuit breaker structure under high gas pressure, which comprises a first cavity, a second cavity and a vacuum cavity, wherein the three cavities are combined with each other to play a role,
(1) the pressure difference between the inside and the outside of the bellows is controlled to be smaller than the maximum bearing pressure, so that the service life of the bellows is effectively ensured, and the mechanical life of the circuit breaker is further ensured;
(2) by establishing the second cavity of the second-level pressure difference, the gas pressure and the insulation capacity in the insulation cylinder are improved, the size of the insulation part is effectively reduced, and the size of the circuit breaker is further reduced;
(3) the first cavity is filled with low pressure of 0.1-0.25MPa through the self-sealing valve, high pressure gas is isolated from the first corrugated pipe, the first corrugated pipe is protected, the first corrugated pipe and the second corrugated pipe synchronously stretch when the circuit breaker is separated, so that the volume change of the first cavity is small, and the relative constant air pressure is maintained;
(4) the air pressure of the second cavity can be increased on the basis of the air pressure of the first cavity, the pressure difference is smaller than the maximum tolerance pressure of the second corrugated pipe, so that the high air pressure and high insulation performance in the second cavity are realized, and the contact spring component and the circuit breaker mechanism are not connected in a reciprocating manner due to the fact that the air pressure in the second cavity is high (0.5 MPa at most) and the air pressure difference is larger than the maximum tolerance pressure of the corrugated pipe, and the magnetic fluid rotary sealing technology with mature technology is adopted;
(5) the movable end part of the circuit breaker is separated from the compartment, the pressure of insulating gas in the insulating cylinder is improved while the pressure resistance of the corrugated pipe is controlled, and the insulating capacity is improved, so that the safe insulating distance is shortened, the whole size of the circuit breaker is reduced, and the application scene of space limitation is met.
Drawings
Fig. 1 is a schematic structural view of a vacuum circuit breaker under high gas pressure according to the present invention;
fig. 2 is a schematic structural view of the vacuum circuit breaker under high gas pressure according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The utility model provides a vacuum circuit breaker structure under high gas pressure, includes first cavity 1, second cavity 2, vacuum chamber 3, first cavity 1 includes first bellows 11, moving end face 12, goes out wire conducting seat 13, moves conducting rod 14, be equipped with first bellows 11 between first cavity 1 and the vacuum chamber 3, second cavity 2 includes second bellows 21, insulating cylinder 22, jar body top cap 23, be equipped with second bellows 21 between second cavity 2 and the first cavity 1, still be equipped with self-sealing valve 100 on first cavity 1 and the second cavity 2 respectively, the both ends of first bellows 11 are welded respectively on moving conducting rod 14 and moving end face 12, be equipped with wire conducting seat 13 on the moving end face 12, and carry out the plane seal through axial sealing ring 200, still be equipped with self-sealing valve 100 on the wire conducting seat 13, wire conducting seat 13 establishes spring contact finger 131, the inner circle of spring contact finger 131 contacts with moving conducting rod 14, still be equipped with between second bellows 22 and the outer sleeve body of sealing ring 21 and the outer sleeve of sealing ring 24 are equipped with screw cap assembly 242, and are equipped with the sealing ring assembly 242 is equipped with on the sealing ring 24 on the second cavity 2 and the cam sleeve body of sealing ring 22, and the sealing ring assembly is equipped with the screw cap assembly is screwed with on the second bellows 24 respectively to the two, and the sealing ring assembly is equipped with the screw cap assembly is screwed with on the sealing ring assembly is equipped with on the sealing ring assembly of sealing cap 24.
The first cavity 1 is filled with low pressure of 0.1-0.25MPa through the self-sealing valve 100, so that high pressure gas is isolated from the first corrugated pipe 11, and the first corrugated pipe 11 is protected. The first corrugated pipe 11 and the second corrugated pipe 21 synchronously stretch when the circuit breaker is assembled, so that the volume change of the first cavity 1 is small, and the relative constant air pressure is maintained; the air pressure of the second cavity 2 can be increased based on the air pressure of the first cavity 1, and the pressure difference is smaller than the maximum tolerance pressure of the second corrugated pipe 21. Thereby realizing high gas pressure and high insulation performance in the second chamber 2. Because the pressure in the second cavity 2 is high (up to 0.5 MPa), and the pressure difference between the second cavity and the atmosphere is larger than the maximum tolerance pressure of the corrugated pipe, the contact spring assembly 241 and the circuit breaker mechanism are not connected in a reciprocating motion way, and the magnetic fluid rotary sealing technology with mature technology is adopted.
The high-pressure cavity can be filled with high-pressure gas, such as sulfur hexafluoride, carbon dioxide, nitrogen, dry air and the like, the air pressure value of the high-pressure cavity can be 0.5-1.0MPa, and external insulation of the high-voltage-class vacuum circuit breaker can be realized by filling the high-pressure gas in the high-pressure cavity. The first bellows 11 is a sealing member of a vacuum arc-extinguishing chamber in a vacuum circuit breaker, and mainly plays a role in ensuring that a moving contact moves within a certain range and maintains high vacuum for a long time, and in addition, the first bellows 11 also has a maximum bearing pressure, and when the pressure difference between the inner side and the outer side of the first bellows 11 is greater than the maximum bearing pressure of the first bellows 11, the first bellows 11 is fatigued, so that the service life is reduced. Because the pressure in the vacuum cavity 3 is usually 0MPa, the maximum bearing pressure of the corrugated pipe is usually 0.3MPa, the first cavity 1 is a low-pressure air chamber, and the pressure of the first cavity 1 can be set to be 0.1-0.25MPa by considering the air pressure expansion caused by heat when the circuit breaker is opened, so that the difference between the pressure in the first cavity 1 and the pressure in the vacuum cavity 3 is not more than 0.3MPa in a normal state, namely the maximum bearing pressure of the corrugated pipe is larger than the difference between the pressure in the first cavity 1 and the pressure in the vacuum cavity 3, and the service life of the first corrugated pipe 11 is further prolonged.
The second bellows 21 is a sealing member of the movable end insulating cylinder 22 of the vacuum circuit breaker, and mainly plays a role of moving along with the circuit breaker in a certain range and keeping gas sealing for a long time, in addition, the second bellows 21 also has a maximum bearing pressure, and when the pressure difference between the inner side and the outer side of the bellows is larger than the maximum bearing pressure of the bellows, the second bellows 21 is fatigued, and further the service life of the bellows is reduced. Because the pressure in the first cavity 1 is 0.1-0.25MPa, and the maximum bearing pressure of the corrugated pipe is usually 0.3MPa, the pressure in the second cavity 2 can be increased by 0.1-0.25MPa on the basis of the pressure in the first cavity 1, so that the difference between the pressure in the second cavity 2 and the pressure in the second cavity 2 is not more than 0.3MPa in a normal state, namely the maximum bearing pressure of the corrugated pipe is greater than the difference between the pressure in the first cavity 1 and the pressure in the vacuum cavity 3, and the service life of the second corrugated pipe 21 is further prolonged. Meanwhile, the maximum air pressure in the second cavity 2 can reach approximately 0.5MPa, and the maximum air pressure of 0.25MPa relative to the maximum air pressure of the first cavity 1 greatly improves the insulation performance, so that the design sizes of the insulating cylinder 22 and the insulating pull rod 24 can be greatly reduced, and the overall size of the circuit breaker is effectively reduced because the size of the insulating part occupies a large proportion in the circuit breaker structure.
In addition, the outlet conducting seat 13 of the first cavity 1 is provided with a self-sealing valve 100, the tank top cover 23 of the second cavity 2 is provided with the self-sealing valve 100, the self-sealing valve 100 can be externally connected with an air pressure monitoring device, air pressure real-time monitoring and pressure alarming are achieved, and the safety of the corrugated pipe is further guaranteed. The self-sealing valve 100 can be connected with a pipeline during equipment maintenance to realize the function of gas filling and discharging.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a vacuum circuit breaker structure under high gas pressure which characterized in that: including first cavity (1), second cavity (2), vacuum chamber (3), first cavity (1) include first bellows (11), move terminal surface (12), go out line conducting seat (13), move conducting rod (14), be equipped with first bellows (11) between first cavity (1) and the vacuum chamber (3), second cavity (2) include second bellows (21), insulating cylinder (22), jar body top cap (23), be equipped with second bellows (21) between second cavity (2) and the first cavity (1), still be equipped with on first cavity (1) and the second cavity (2) respectively from seal valve (100).
2. The high gas pressure vacuum interrupter structure of claim 1, wherein: both ends of the first corrugated pipe (11) are welded on the movable conducting rod (14) and the movable end face (12) respectively.
3. The high gas pressure vacuum interrupter structure of claim 2, wherein: the movable end face (12) is provided with an outgoing line conducting seat (13), plane sealing is carried out through an axial sealing ring (200), and the outgoing line conducting seat (13) is also provided with a self-sealing valve (100).
4. A vacuum interrupter structure under high gas pressure according to claim 3, wherein: and a spring contact finger (131) is sleeved in the outgoing line conducting seat (13), and the inner ring of the spring contact finger (131) is contacted with the movable conducting rod (14).
5. The high gas pressure vacuum interrupter structure of claim 4, wherein: the outgoing line conducting seat (13) is also connected with an insulating cylinder (22) through bolts, and a flange of the second corrugated pipe (21) is pressed between the outgoing line conducting seat and the insulating cylinder.
6. The high gas pressure vacuum interrupter structure of claim 5, wherein: axial sealing rings (200) are respectively pressed between the two sides of the flange of the second corrugated pipe (21) and the upper and lower parts.
7. The high gas pressure vacuum interrupter structure of claim 6, wherein: an outer screw rod is arranged at the end part of the second corrugated pipe (21) and is in threaded connection with the movable conducting rod (14).
8. The high gas pressure vacuum interrupter structure of claim 7, wherein: the second corrugated pipe (21) is internally provided with a screw hole hexagonal column and is screwed and fixed with the insulating pull rod (24), and the insulating pull rod (24) is provided with a contact spring component (241) and is sleeved and embedded with the cam (242).
9. The high gas pressure vacuum interrupter structure of claim 8, wherein: the cam (242) shaft on the cam (242) and the insulating cylinder (22) are subjected to external rotary dynamic seal through the magnetic fluid rotary sealing device.
10. The high gas pressure vacuum interrupter structure of claim 9, wherein: the insulating cylinder (22) is provided with a tank top cover (23) and is subjected to plane sealing through an axial sealing ring (200), and the tank top cover (23) is provided with a self-sealing valve (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310206797.XA CN116364468A (en) | 2023-03-07 | 2023-03-07 | Vacuum circuit breaker structure under high gas pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310206797.XA CN116364468A (en) | 2023-03-07 | 2023-03-07 | Vacuum circuit breaker structure under high gas pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116364468A true CN116364468A (en) | 2023-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310206797.XA Pending CN116364468A (en) | 2023-03-07 | 2023-03-07 | Vacuum circuit breaker structure under high gas pressure |
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| Country | Link |
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| CN (1) | CN116364468A (en) |
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2023
- 2023-03-07 CN CN202310206797.XA patent/CN116364468A/en active Pending
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