CN116469726A - Self-energy arc-extinguishing chamber with flow guiding structure and circuit breaker - Google Patents
Self-energy arc-extinguishing chamber with flow guiding structure and circuit breaker Download PDFInfo
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- CN116469726A CN116469726A CN202310660253.0A CN202310660253A CN116469726A CN 116469726 A CN116469726 A CN 116469726A CN 202310660253 A CN202310660253 A CN 202310660253A CN 116469726 A CN116469726 A CN 116469726A
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- 230000007423 decrease Effects 0.000 claims description 3
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- 238000000034 method Methods 0.000 abstract description 27
- 230000008569 process Effects 0.000 abstract description 23
- 238000009413 insulation Methods 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 7
- 229910021645 metal ion Inorganic materials 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 description 10
- 238000010891 electric arc Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
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- 238000002485 combustion reaction Methods 0.000 description 2
- 238000002242 deionisation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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Classifications
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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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
- H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
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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
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
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- Circuit Breakers (AREA)
Abstract
The invention provides a self-energy arc extinguish chamber with a flow guide structure, which comprises a supporting component, a static contact system and a moving contact system. The support component comprises an insulating support cylinder with openings at two ends, a guide cylinder, a support guide piece and an outer guide cover, and the static contact system and the moving contact system are respectively arranged at two ends of the insulating support cylinder and positioned in the insulating support cylinder. The diversion structure is realized by a three-layer structure, the inside is a diversion cylinder, the middle is a supporting diversion piece with a vent hole, and the outermost side is an outer diversion cover. The hot air flow direction is changed through the structure, and the hot air flow cooling channel is prolonged to reduce the hot air flow speed and the temperature of a large amount of metal ions carried in the opening process of the circuit breaker, so that the insulation capacity of the self-energy type circuit breaker to the shell in the process of opening full-capacity short-circuit current, particularly in the process of opening short-circuit current above 50kA, is improved, and the self-energy type arc extinguishing chamber is prevented from breaking down the circuit breaker shell. The invention further provides a circuit breaker.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a self-energy arc-extinguishing chamber with a diversion structure and a circuit breaker.
Background
SF6 circuit breaker becomes one of the most widely used high-voltage circuit breaker types in the world at present due to excellent insulation and breaking performance, and along with increasing mention of living standard of people, the electricity demand is also increased, so that the power grid load breaks through new high year by year, and higher requirements are also provided for the capacity of the circuit breaker for breaking rated short-circuit current; at the same time, the increasing demands of users for miniaturization and compactness of products have led to a continual development of high-voltage electrical products toward reliable miniaturization.
The larger the short-circuit breaking current of the circuit breaker is, the larger the energy generated by arc combustion in the breaking process is, the more a great amount of metal ions are carried by hot air flow generated by arc combustion, the unsmooth discharge of the hot air flow and the slow discharge speed generally lead to thermal breakdown after breaking, and the unreasonable design of a hot air flow discharge path or too short path can lead to the breakdown of a shell in the breaking process of the circuit breaker. The more pronounced the shell breakdown phenomenon is at smaller shell sizes.
Currently, the current diversion structure of the circuit breaker mainly adopts a double-layer diversion structure, as shown in fig. 1. In the arc extinguishing chamber, the inner guide cover 03 and the outer guide cover 02 form a double-layer guide structure; the inner guide cover 03 and the outer guide cover 02 are both fixed on the insulating support column 01, the contact seat 04 is connected with the inner guide cover 03, part of the contact seat 04 is positioned in the outer guide cover 02 and extends out of the outer guide cover 02, the arc contact 05 and the contact piece 06 are both fixed on the contact seat 04 and arranged in the shielding cover 07, and the electric connection 08 is a protruding part of the inner guide cover 03 and is used for being electrically connected with the outside. When the circuit breaker breaks full-capacity short-circuit current, electric arc burns heating gas, make explosion chamber inside atmospheric pressure rise, high-pressure gas flows by the water conservancy diversion hole on the inner water conservancy diversion cover 03, spread to the explosion chamber outside by the little round hole on the outer water conservancy diversion cover 02, this kind of structure is comparatively effective to the circuit breaker of circuit breaker rated short-circuit current less than or equal to 50kA, under the prerequisite that circuit breaker shell size does not show the increase, when short-circuit current is greater than 50kA, this kind of structure break full-capacity short-circuit current is more difficult, easily lead to the explosion chamber to the casing breakdown of circuit breaker in-process.
Therefore, how to overcome the above technical drawbacks is a urgent problem for those skilled in the art.
Disclosure of Invention
The invention aims to provide a self-energy arc-extinguishing chamber with a diversion structure and a breaker, and the phenomenon of break breakdown caused by overheat of a break of the arc-extinguishing chamber is avoided.
In order to solve the above technical problems, the present invention provides a self-energy arc extinguishing chamber with a diversion structure, comprising: the device comprises a support assembly, a fixed contact system and a moving contact system;
the support assembly comprises an insulating support cylinder with openings at two ends, a guide cylinder, a support guide piece and an outer guide cover, and the fixed contact system and the moving contact system are respectively arranged at two ends of the insulating support cylinder and positioned in the insulating support cylinder;
the guide cylinder is in a cylindrical structure, the first end of the cylindrical structure is provided with a first opening and is connected with the first end of the insulating support cylinder, the side wall of the cylindrical structure is provided with a second opening, the second opening of the guide cylinder and the second opening of the support guide cylinder are arranged in a staggered manner, and the outer guide cylinder is tightly sleeved at the second opening of the support guide cylinder and is provided with a plurality of first through holes.
Optionally, in the self-energy arc extinguishing chamber with the flow guiding structure, the flow guiding cylinder has a taper, and the inner diameter gradually decreases from the first opening to the second opening.
Optionally, in the self-energy arc extinguishing chamber with a flow guiding structure, the static contact system includes a contact seat, a flow guiding shield and a static arc contact, the static arc contact is arranged inside the contact seat, one end of the contact seat is connected with the supporting flow guiding piece, the contact seat is communicated with the flow guiding barrel, one end of the flow guiding shield is sleeved on a main nozzle of the moving contact system, and the other end of the flow guiding shield is conical and connected into the contact seat.
Optionally, in the self-energy arc extinguishing chamber with a flow guiding structure, the moving contact system comprises a driving piece, a cylinder, a piston, a moving main contact, a one-way valve, a moving arc contact, an auxiliary nozzle and a main nozzle, wherein the cylinder is located inside the insulating support cylinder and connected with the second end of the insulating support cylinder, the driving piece movably penetrates through one end of the cylinder, the piston is arranged on the driving piece, the moving arc contact, the auxiliary nozzle and the moving main contact are sequentially sleeved from inside to outside and are connected with the piston, a compressed air chamber is formed between the moving main contact, an expansion chamber is formed between the piston, the auxiliary nozzle and the moving main contact, a second through hole for communicating the compressed air chamber and the expansion chamber is arranged on the piston, the one-way valve is arranged on the second through hole, and two ends of the main nozzle are respectively connected with the static contact system and the moving main contact.
Optionally, in the self-energy arc extinguishing chamber with the flow guiding structure, the supporting flow guiding piece is provided with a threaded hole connected with the outer flow guiding cover.
Optionally, in the self-energy arc extinguishing chamber with the diversion structure, the outer diversion cover is of an integrated structure or a welded structure.
Optionally, in the self-energy arc extinguishing chamber with the flow guiding structure, the second opening of the flow guiding cylinder includes an end opening and a U-shaped groove disposed on the side wall and communicated with the end opening.
Optionally, in the self-energy arc extinguishing chamber with the flow guiding structure, the second openings of the supporting flow guiding member are a plurality of openings which are staggered with the U-shaped grooves of the flow guiding cylinder.
Optionally, in the self-energy arc extinguishing chamber with the flow guiding structure, the second opening of the flow guiding cylinder includes an end opening, and the supporting flow guiding piece is provided with a third opening at a position opposite to the second opening of the flow guiding cylinder.
The invention also provides a circuit breaker comprising the self-energy arc extinguishing chamber with the flow guiding structure.
The invention provides a self-energy arc extinguish chamber with a flow guiding structure, which has the beneficial effects that:
the diversion structure is realized by a three-layer structure, the inside is a diversion cylinder, the middle is a supporting diversion piece with a vent hole, and the outermost side is an outer diversion cover. The hot air flow direction is changed through the structure, and the hot air flow cooling channel is prolonged to reduce the hot air flow speed and temperature of a large amount of metal ions carried in the opening process of the circuit breaker, so that the full-capacity short-circuit current of the self-energy circuit breaker is opened, and particularly the insulating capability of the self-energy arc extinguishing chamber to the shell of the circuit breaker in the process of opening the short-circuit current of more than 50kA is improved, and the self-energy arc extinguishing chamber is prevented from breaking down the shell of the circuit breaker.
The invention also provides a circuit breaker with the self-energy arc-extinguishing chamber with the diversion structure, which has the same beneficial effects and is not described herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a circuit breaker employing a two-layer flow guiding structure in the prior art;
fig. 2 is a schematic structural diagram of a self-energy arc extinguishing chamber with a diversion structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of airflow direction of a self-energy arc-extinguishing chamber with a flow guiding structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a three-layer flow guiding structure according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of FIG. 4 in the direction B-B;
FIG. 6 is a schematic structural diagram of a guide shell according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a guide cylinder according to an embodiment of the present invention.
In fig. 1:
01-insulating pillars; 02-an outer pod; 03-inner pod; 04-contact base; 05-arc contacts; 06-a contact; 07-shielding; 08-electrical coupling;
in fig. 2-7:
1-supporting a flow guide; 2-an outer guide sleeve; 3-a guide cylinder; 4-contact base; 5-an insulating support cylinder; 6-diversion shielding; 7-a main nozzle; 8-auxiliary nozzle; 9-a one-way valve; 10-a piston; 11-cylinder; 12-static arc contacts; 13-a moving main contact; 14-moving arc contacts;
a-an expansion chamber; b-plenum.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The invention provides a self-energy arc-extinguishing chamber with a diversion structure and a breaker, and the phenomenon of break breakdown caused by overheat of a break of the arc-extinguishing chamber is avoided.
In order to make the technical solution provided by the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Specifically, referring to fig. 2 to 7, the self-energy arc extinguishing chamber with a diversion structure provided by the present invention includes: support component, stationary contact system and moving contact system.
The support component is used as a flow guiding structure of the self-energy arc extinguishing chamber and mainly comprises an insulating support cylinder 5 with two open ends, a flow guiding cylinder 3, a supporting flow guiding piece 1 and an outer flow guiding cover 2, wherein a static contact system and a moving contact system are respectively arranged at two ends of the insulating support cylinder 5 and are positioned in the insulating support cylinder 5.
The guide cylinder 3, the supporting guide piece 1 and the outer guide cover 2 are of cylindrical structures, and the guide cylinder 3, the supporting guide piece 1 and the outer guide cover 2 are sequentially sleeved from inside to outside.
The two ends of the guide cylinder 3 are opened, and the first opening is communicated with the static contact system.
The first end of the supporting guide piece 1 is provided with a first opening and is connected with the first end of the insulating supporting cylinder 5, and the side wall of the supporting guide piece 1 is provided with a second opening. The second opening of the guide cylinder 3 is staggered with the second opening of the supporting guide piece 1, so as to prolong an airflow cooling path in the process of breaking full-capacity short-circuit current (namely, the maximum short-circuit current which can be broken in the running process of the breaker) of the breaker, and reduce the airflow velocity of hot airflow.
The outer air guide sleeve 2 is tightly sleeved at the second opening of the supporting air guide piece 1, and a plurality of through holes are formed in the outer air guide sleeve 2, so that high-pressure gas in the arc extinguishing chamber is diffused to the outside of the arc extinguishing chamber from the plurality of through holes in the outer air guide sleeve 2 through the supporting air guide piece 1 by the air guide sleeve 3.
The self-energy arc extinguishing chamber with the flow guiding structure is realized by a three-layer structure, the inside of the self-energy arc extinguishing chamber is provided with a flow guiding cylinder 3, the middle of the self-energy arc extinguishing chamber is provided with a supporting flow guiding piece 1 with a vent hole, and the outermost side of the self-energy arc extinguishing chamber is provided with an outer flow guiding cover 2. The hot air flow direction is changed through the structure, and the hot air flow cooling channel is prolonged to reduce the hot air flow speed and the temperature of a large amount of metal ions carried in the opening process of the circuit breaker, so that the insulation capacity of the self-energy type circuit breaker to the shell in the process of opening full-capacity short-circuit current, particularly in the process of opening short-circuit current above 50kA, is improved, and the self-energy type arc extinguishing chamber is prevented from breaking down the circuit breaker shell.
It should be explained that the thermal breakdown phenomenon of the circuit breaker is: in the breaking process of the circuit breaker, the temperature of arc gap plasma after the zero crossing of current is still very high, and under the competing effect of transient recovery voltage and deionization process, if the deionization capacity is weaker, the phenomenon of break breakdown of a break of an arc extinguishing chamber caused by overheating can be generated.
In order to ensure that the air flow between the guide cylinder 3 and the supporting guide piece 1 is smooth, the guide cylinder 3 has a certain taper, and the inner diameter gradually decreases from the first opening to the second opening, namely, a tapered channel is formed in the air flow direction.
In a specific embodiment, the static contact system comprises a contact seat 4, a diversion shield 6 and a static arc contact 12, wherein the static arc contact 12 is arranged inside the contact seat 4, one end of the contact seat 4 is connected with the supporting diversion piece 1, the contact seat 4 is communicated with the diversion cylinder 3, one end of the diversion shield 6 is sleeved on a main nozzle 7 of the moving contact system, and the other end of the diversion shield is conical and extends to be connected into the contact seat 4. The guide cylinder 3 is assembled with the contact seat 4 in a limiting way through the supporting guide piece 1.
In a specific embodiment, the moving contact system comprises a driving piece, a cylinder 11, a piston 10, a moving main contact 13, a one-way valve 9, a moving arc contact 14, an auxiliary nozzle 8 and a main nozzle 7. The cylinder 11 is located inside the insulating support cylinder 5 and is connected to the second end of the insulating support cylinder 5. The driving member may be a straight tube. The driving piece is movably arranged at one end of the air cylinder 11 in a penetrating manner, the piston 10 is arranged on the driving piece, the moving arc contact 14, the auxiliary nozzle 8 and the moving main contact 13 are sequentially sleeved from inside to outside and are connected with the piston 10, a compressed air chamber b is formed among the moving main contact 13, the piston 10 and the air cylinder 11, an expansion chamber a is formed among the piston 10, the auxiliary nozzle 8 and the moving main contact 13, a second through hole for communicating the compressed air chamber b and the expansion chamber a is formed in the piston 10, a one-way valve 9 is arranged on the second through hole, and two ends of the main nozzle 7 are respectively connected with the fixed contact system and the moving main contact 13.
It should be noted that, the self-energy breaker generally adopts the working principle of combining self-energy and air compression, and for the break of smaller current of no more than 30% rated short-circuit breaking current, only relatively smaller air blowing pressure is needed, and the air blowing pressure needs to be provided by the operation mechanism driving the air compressing chamber b to compress air, at this time, the one-way valve 9 is in an open state, and can transmit the pressure established by the air compressing chamber b to the expansion chamber a, so as to ensure the effective air blowing and cooling effects on the electric arc. For larger short-circuit currents, the electric arc can build enough pressure in the expansion chamber a, and a pressure difference is formed between the expansion chamber a and the air pressing chamber b to enable the one-way valve 9 to be in a closed state, so that the energy provided by the electric arc can be further relied on to generate enough pressure in the expansion chamber a to ensure effective air blowing and cooling effects on the electric arc. In the process, because the short-circuit current is very large, the pressure and the temperature of hot air flow in the arc extinguishing chamber are often too high, and if the hot air flow with high temperature and high pressure diffuses into the shell of the circuit breaker, the insulation capacity between the arc extinguishing chamber and the shell of the circuit breaker is reduced, so that the arc extinguishing chamber discharges the shell of the circuit breaker; if the high-temperature high-pressure hot air flow is diffused too slowly, the fracture temperature of the circuit breaker is delayed and is difficult to diffuse, and then the thermal breakdown phenomenon occurs in the breaking process of the circuit breaker. The reasonable design explosion chamber hot air current water conservancy diversion structure reduces the velocity of flow and the temperature of hot air current, and it is crucial to improve the switching reliability of circuit breaker under less circuit breaker casing size.
The supporting air guide piece 1 is provided with a threaded hole connected with the outer air guide sleeve 2. The supporting guide piece 1 is a guide piece of hot air flow and is also a current carrying piece of current of an arc extinguishing chamber, and a threaded hole for installing the outer guide cover 2 is processed at the position of an opening.
In order to improve the structural strength of the outer dome 2, the outer dome 2 is an integrally formed structure or a welded formed structure. The outer air guide sleeve 2 is arranged on the outer side of the opening position of the supporting air guide piece 1, and has the air guide function and the shielding function.
In one form, as shown in fig. 2-6, the second opening of the draft tube 3 includes an end opening, and a U-shaped slot disposed in the sidewall and communicating with the end opening. The U-shaped groove arranged on the guide cylinder 3 changes the flow direction of the hot air flow on one hand and improves the diffusion efficiency of the hot air flow on the other hand.
Further, the second openings of the supporting guide piece 1 are a plurality of openings which are staggered with the U-shaped grooves of the guide cylinder 3. Specifically, as shown in fig. 5, a U-shaped groove is provided at the top of the guide cylinder 3. The top of the supporting deflector 1 (at the position opposite to the U-shaped groove) is not perforated, and only the left, right and lower portions are perforated, and the perforated shape may be a rectangular hole, a round hole or a hole of other shape, which is not limited herein. The device can prolong the circulation length of air flow, improve the capacity of the high-voltage alternating current breaker for breaking full-capacity short-circuit current and improve the electrical reliability of the self-energy breaker in the operation process.
As shown in fig. 2, in the arc extinguishing chamber, the main nozzle 7, the auxiliary nozzle 8, the moving main contact 13 and the piston 10 form an expansion chamber a, the moving main contact 13, the cylinder 11 and the piston 10 form a pressure chamber b, and a second through hole for communicating the expansion chamber a and the pressure chamber b is formed in the piston 10. The diversion shielding 6 and the contact base 4 with the vent holes form a gas flow passage of the arc extinguishing chamber, and the diversion barrel 3, the supporting diversion piece 1 and the outer diversion cover 2 with the first through holes form a three-layer diversion structure. The dynamic and static sides of the arc extinguishing chamber are connected into a whole through the insulating supporting cylinder 5. The breaking process of the circuit breaker is divided into four stages, namely a precompression stage, an arcing stage and a medium recovery stage.
In the precompression stage, the static arc contact 12 is not separated from the moving arc contact 14, the piston 10 drives the moving main contact 13, the one-way valve 9, the main nozzle 7, the auxiliary nozzle 8 and the moving arc contact 14 to move rightwards together, so that gas in the gas-pressing chamber b is compressed, and high-pressure gas in the gas-pressing chamber b flows into the expansion chamber a through a second through hole in the piston 10 and the one-way valve 9, and the gas pressure in the expansion chamber a is increased.
In the arcing stage, the static arc contact 12 and the moving arc contact 14 start to be separated, an electric arc is generated between the static arc contact 12 and the moving arc contact 14, the electric arc burns and heats the gas between the static arc contact 12 and the moving arc contact 14, so that the gas pressure in the expansion chamber a rises rapidly, when the gas pressure in the expansion chamber a is higher than that in the air pressure chamber b, the check valve 9 moves rightward, an air flow channel between the expansion chamber a and the air pressure chamber b is blocked (namely, a second through hole on the piston 10 is blocked), and the pressure in the expansion chamber a rises rapidly.
In the medium recovery stage, as shown in fig. 3, as the main nozzle 7 moves rightwards, the throat of the main nozzle 7 is separated from the static arc contact 12, the blocking effect of the static arc contact 12 on the throat of the main nozzle 7 disappears, high-temperature gas carrying a large amount of metal ions in the expansion chamber a rapidly diffuses along the direction of the air flow shown in fig. 3, when the high-temperature gas flows to the guide cylinder 3, a part of the air flow moves upwards along the U-shaped groove on the upper side of the guide cylinder 3 under the guide of the guide cylinder 3 and meets the supporting guide piece 1 to change the direction of the air flow, the hot air flows from the openings on the two sides of the supporting guide piece 1 to the outer guide cover 2 along the direction shown in fig. 5, then is diffused into the circuit breaker shell through the first through holes on the outer guide cover 2, and the other part of hot air flows leftwards along the guide cylinder 3, so that the hot air flows around the guide cylinder 3 along the direction shown by the arrow below in fig. 5, flows into the outer guide cover 2 through the openings on the left side, the right side and the lower side of the supporting guide piece 1 as shown in fig. 5, and then is diffused into the circuit breaker shell through the first through holes on the outer guide cover 2. Through the use of the three-component flow guiding structure, the flow speed of hot air flow is greatly reduced, the temperature is effectively cooled, the probability of breakdown of the shell in the breaking process of the circuit breaker is reduced, and the breaking reliability of the circuit breaker is improved.
In another form, as shown in fig. 7, the second opening of the guide cylinder 3 comprises an end opening, and the supporting guide 1 is provided with a third opening at a position opposite to the second opening of the guide cylinder 3. Similarly, the second openings of the supporting guide piece 1 are a plurality of U-shaped grooves which are staggered with the U-shaped grooves of the guide cylinder 3. The top of the supporting guide 1 is not perforated, and only left, right and lower portions are perforated, and the perforated shape may be a rectangular hole, a round hole or a hole of other shape, which is not limited herein.
The guide cylinder 3 can also be designed into a cylindrical structure with a certain taper, the upper part of the guide cylinder is not provided with a U-shaped groove, but a large number of round hole structures are processed at the end part of the supporting guide piece 1 to serve as a third opening, so that the heat dissipation efficiency is improved. And one part of hot air flows out of the third opening at the end part of the supporting guide piece 1, and the other part bypasses the guide cylinder 3 and overflows from the openings at the two sides and the lower part of the supporting guide piece 1, so that the heat dissipation efficiency of the arc extinguishing chamber is improved.
In addition, the invention also provides a circuit breaker which comprises the self-energy arc extinguishing chamber with the diversion structure. Obviously, the circuit breaker with the self-energy arc extinguishing chamber has the same beneficial effects and is not described herein.
In the process of breaking the full-capacity short-circuit current of the circuit breaker, if no measures for effectively reducing the flow rate and the temperature of hot air flow exist, the insulation capacity of an insulation medium between the arc extinguishing chamber and the circuit breaker shell is rapidly reduced due to rapid temperature rise, and when the insulation capacity is reduced to a certain extent, the arc extinguishing chamber discharges to the shell.
According to the arc extinguishing chamber structure with the flow guiding structure and the circuit breaker, in the process that the circuit breaker is used for switching on and switching off full-capacity short-circuit current of more than 50kA, high-temperature and high-pressure hot air flow carrying a large amount of metal ions is sprayed out from the direction shown in the figure 3, and under the flow guiding effect of the flow guiding cylinder 3, the flow direction of the hot air flow is changed for the first time, so that the speed of the hot air flow is reduced to a certain extent; when the hot air flows out of the guide shell 3 and flows to the outer guide shell 2 through the opening on the supporting guide piece 1, the flow direction of the hot air is changed for the second time, so that the speed of the hot air is further reduced; the hot air flows out from the small round holes (first through holes) on the outer air guide sleeve 2, and the flow direction of the hot air is changed for the third time, so that the hot air is uniformly diffused into the breaker shell; through the use of three-layer flow guiding structure, the airflow cooling path in the process of switching on and off full-capacity short-circuit current of the high-voltage alternating-current circuit breaker is prolonged, the flow speed and temperature of the airflow are reduced, the problem that the insulation capacity of a local position between an arc extinguish chamber and a circuit breaker shell is suddenly reduced due to the fact that the airflow is directly blown to the circuit breaker shell is avoided, and the reliability of switching on and off of the circuit breaker is improved.
In the description of the present application, it should be understood that references to orientation descriptions, such as directions of up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is more than two, and if there is a description that the first and second are only used for distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The inclusion of an element defined by the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.
In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical solution.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. A self-energized arc chute with a flow-guiding structure, comprising: the device comprises a support assembly, a fixed contact system and a moving contact system;
the support assembly comprises an insulating support cylinder with openings at two ends, a guide cylinder, a support guide piece and an outer guide cover, and the fixed contact system and the moving contact system are respectively arranged at two ends of the insulating support cylinder and positioned in the insulating support cylinder;
the guide cylinder is in a cylindrical structure, the first end of the cylindrical structure is provided with a first opening and is connected with the first end of the insulating support cylinder, the side wall of the cylindrical structure is provided with a second opening, the second opening of the guide cylinder and the second opening of the support guide cylinder are arranged in a staggered manner, and the outer guide cylinder is tightly sleeved at the second opening of the support guide cylinder and is provided with a plurality of first through holes.
2. The self-powered arc chute having a flow guiding structure according to claim 1, wherein the flow guiding cylinder has a taper and an inner diameter gradually decreases from the first opening to the second opening.
3. The self-energy arc extinguishing chamber with a flow guiding structure according to claim 1, wherein the static contact system comprises a contact seat, a flow guiding shield and a static arc contact, the static arc contact is arranged inside the contact seat, one end of the contact seat is connected with the supporting flow guiding piece, the contact seat is communicated with the flow guiding cylinder, one end of the flow guiding shield is sleeved on a main nozzle of the moving contact system, and the other end of the flow guiding shield is conical and connected into the contact seat.
4. The self-energy arc extinguishing chamber with the flow guiding structure according to claim 1, wherein the moving contact system comprises a driving piece, an air cylinder, a piston, a moving main contact, a one-way valve, a moving arc contact, an auxiliary nozzle and a main nozzle, the air cylinder is positioned in the insulating support cylinder and is connected with the second end of the insulating support cylinder, the driving piece is movably arranged at one end of the air cylinder in a penetrating manner, the piston is arranged on the driving piece, the moving arc contact, the auxiliary nozzle and the moving main contact are sequentially sleeved from inside to outside and are connected with the piston, a pressure chamber is formed among the moving main contact, the piston, the auxiliary nozzle and the moving main contact, an expansion chamber is formed among the piston, a second through hole for communicating the pressure chamber and the expansion chamber is arranged on the piston, the one-way valve is arranged on the second through hole, and two ends of the main nozzle are respectively connected with the fixed contact system and the moving main contact.
5. The self-energizing arc extinguishing chamber with a flow guiding structure according to claim 1, wherein the supporting flow guiding member is provided with a screw hole connected with the outer flow guiding cover.
6. The self-energized arc chute with a flow-guiding structure according to claim 1, wherein the outer flow-guiding cover is an integrally formed structure or a welded formed structure.
7. The self-powered arc chute having a flow directing structure as in any one of claims 1-6 wherein the second opening of the flow directing cylinder comprises an end opening and a U-shaped slot disposed in the sidewall and in communication with the end opening.
8. The self-powered arc chute with a flow guiding structure according to claim 7, wherein the second openings of the supporting flow guiding members are a plurality of openings which are staggered with the U-shaped grooves of the flow guiding cylinder.
9. The self-powered arc chute having a flow directing structure as in any of claims 1-6 wherein the second opening of the flow guide cylinder comprises an end opening and the supporting flow guide member defines a third opening opposite the second opening of the flow guide cylinder.
10. A circuit breaker comprising a self-energized arc chute with a flow-guiding structure according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310660253.0A CN116469726A (en) | 2023-06-05 | 2023-06-05 | Self-energy arc-extinguishing chamber with flow guiding structure and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310660253.0A CN116469726A (en) | 2023-06-05 | 2023-06-05 | Self-energy arc-extinguishing chamber with flow guiding structure and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116469726A true CN116469726A (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310660253.0A Pending CN116469726A (en) | 2023-06-05 | 2023-06-05 | Self-energy arc-extinguishing chamber with flow guiding structure and circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116469726A (en) |
-
2023
- 2023-06-05 CN CN202310660253.0A patent/CN116469726A/en active Pending
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