CN114068241B - Arc extinguishing chamber and circuit breaker - Google Patents
Arc extinguishing chamber and circuit breaker Download PDFInfo
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- CN114068241B CN114068241B CN202010791222.5A CN202010791222A CN114068241B CN 114068241 B CN114068241 B CN 114068241B CN 202010791222 A CN202010791222 A CN 202010791222A CN 114068241 B CN114068241 B CN 114068241B
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- arc
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- 230000001502 supplementing effect Effects 0.000 claims abstract description 128
- 230000003068 static effect Effects 0.000 claims abstract description 43
- 238000004891 communication Methods 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 21
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 51
- 230000009286 beneficial effect Effects 0.000 description 21
- 229910018503 SF6 Inorganic materials 0.000 description 9
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 9
- 229960000909 sulfur hexafluoride Drugs 0.000 description 8
- 238000010891 electric arc Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000009351 contact transmission Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 150000008282 halocarbons Chemical class 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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
- H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
- H01H33/74—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber wherein the break is in gas
-
- 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
Abstract
The invention relates to an arc extinguishing chamber and a circuit breaker. The circuit breaker comprises an operating mechanism and an arc extinguishing chamber, wherein the arc extinguishing chamber comprises a shell, a movable end assembly and a static end assembly, the movable end assembly comprises a pressure cylinder, a movable main contact and a movable arc contact, and the static end assembly comprises a static main contact and a static arc contact; the air cylinder is provided with an air supplementing cylinder, an air supplementing piston is arranged in the air supplementing cylinder in a guiding way, and an air supplementing chamber is formed between the air supplementing piston and the air supplementing cylinder; a communication channel is arranged between the air supplementing chamber and the air pressing chamber; a buffer spring is arranged at the rear of the air supplementing piston, and a spring seat is arranged at the rear end of the buffer spring; the air supplementing piston is provided with a front limit position and a rear limit position on the movable stroke, wherein the front limit position is determined by the freely-stretched buffer spring, and the rear limit position is determined by a corresponding piston limit part or by the buffer spring at the compression limit; the movable stroke of the air supplementing piston is smaller than that of the air pressing cylinder. The scheme solves the problem that the pressure of the arc extinguishing gas of the existing arc extinguishing chamber is insufficient in the later stage of opening the switch.
Description
Technical Field
The invention relates to an arc extinguishing chamber and a circuit breaker.
Background
Sulfur hexafluoride (SF) 6 ) Is a gas with high temperature effect, has GWP of 23900 and is extremely unfriendly to the atmospheric environment. However, high voltage circuit breakers above 126kV commonly use sulfur hexafluoride as an insulating arc extinguishing medium because sulfur hexafluoride gas is a very stable, harmless and nonflammable inert gas, which has a high electrical insulation capacity and discharge extinguishing capacity (arc extinguishing capacity). However, as a greenhouse gas, reducing its use has been a common goal in the high voltage switching industry.
The arc extinguishing chamber used for sulfur hexafluoride gas-free high-voltage switch generally adopts carbon dioxide gas (CO 2 ) Nitrogen (N) 2 ) Or green environment-friendly arc-extinguishing insulating gases without GWP value or with low GWP such as halogenated hydrocarbon insulating gas, and the arc-extinguishing chamber structures of the high-voltage switches are all inherited from the original sulfur hexafluoride gas arc-extinguishing chamber, such as disclosed in Chinese patent application with application publication number of CN104051976A for electric powerA gas insulating device. However, the current arc-extinguishing chamber structure cannot be well adapted to the current green environment-friendly arc-extinguishing insulating gas, and researches show that the pressure of the green environment-friendly arc-extinguishing insulating gas in the latter half of the switching-off process is often insufficient, so that the arc-extinguishing capability of the arc-extinguishing chamber is always not ideal as that of sulfur hexafluoride gas.
In the prior art, in order to improve the arc extinguishing capability of the arc extinguishing chamber, a self-energy arc extinguishing chamber, a double-acting arc extinguishing chamber or a double-acting self-energy arc extinguishing chamber is often adopted. The self-energy type arc extinguishing chamber is characterized in that a thermal expansion chamber and a pressure chamber are arranged on a pressure cylinder of the arc extinguishing chamber, and the pressure is increased by means of air in the thermal expansion chamber to be heated and expanded into air blowing; the double-acting arc extinguishing chamber is characterized in that a static arc contact is arranged in a mode of guiding movement, and a double-acting linkage structure is arranged between the static arc contact and a movable end part of the arc extinguishing chamber, wherein the double-acting linkage structure comprises a connecting rod transmission mode, a gear rack transmission mode, a shifting fork sliding groove transmission mode and the like and is used for enabling the static arc contact to move during opening and closing, for example, a double-acting arc extinguishing chamber double-acting contact transmission device disclosed in China patent publication No. CN202473646U and a double-acting arc extinguishing chamber disclosed in a comparison document cited by the background art of the double-acting arc extinguishing chamber double-acting contact transmission device are arranged. Double-acting self-energy arc-extinguishing chambers such as the self-energy arc-extinguishing chambers of double-acting high-voltage SF6 circuit breakers disclosed in Chinese patent publication No. CN202651038U comprise a thermal expansion chamber and a double-acting linkage structure.
However, the problem of insufficient pressure of arc extinguishing gas in the later stage of switching off of the arc extinguishing chamber cannot be solved by the prior structure, and the switching-on and switching-off performances of the circuit breaker are affected.
Disclosure of Invention
The invention aims to provide an arc-extinguishing chamber, which solves the problem that the pressure of arc-extinguishing gas in the later stage of switching off of the existing arc-extinguishing chamber is insufficient; the invention further aims to provide a circuit breaker, which solves the problem that the closing and opening performances of the existing circuit breaker are limited due to insufficient pressure of arc extinguishing gas in the later stage of switching off of an arc extinguishing chamber.
The arc extinguishing chamber adopts the following technical scheme:
an arc chute, comprising:
the shell is used for forming a closed air chamber for filling arc extinguishing gas; the shell is provided with a cylinder seat;
the movable end assembly comprises a pressure cylinder, a movable main contact and a movable arc contact;
the static end assembly comprises a static main contact and a static arc contact;
the air cylinder is assembled on the cylinder seat in a guiding way along the front-back direction, and moves forwards during closing and moves backwards during opening; a compressed air chamber is formed between the compressed air cylinder and the cylinder seat;
the air cylinder is provided with an air supplementing cylinder which extends along the front-back direction, an air supplementing piston is arranged in the air cylinder in a guiding way, and an air supplementing chamber is formed between the air supplementing piston and the air supplementing cylinder;
a communication channel is arranged between the air supplementing chamber and the air pressing chamber;
the rear of the air supplementing piston is provided with a buffer spring, the rear end of the buffer spring is provided with a spring seat, and the spring seat is used for providing support for the buffer spring;
the air supplementing piston is provided with a front limit position and a rear limit position on the movable stroke, wherein the front limit position is determined by the freely-stretched buffer spring, and the rear limit position is determined by a corresponding piston limit part or by the buffer spring at the compression limit;
the movable stroke of the air supplementing piston is smaller than that of the air pressing cylinder.
The beneficial effects are that: by adopting the technical scheme, the air supplementing cylinder and the air supplementing piston can form an air supplementing chamber, and the air supplementing chamber is communicated with the air pressing chamber through the communication channel; the air supplementing cylinder and the air pressing cylinder synchronously move backwards in the earlier stage of opening the brake, the air supplementing chamber is compressed, the air supplementing piston overcomes the elastic force of the buffer spring to move backwards under the action of air pressure in the air supplementing chamber, and the buffer spring plays a role in buffering, so that the air flow of the air pressing cylinder in the earlier stage of opening the brake is prevented from being greatly influenced; in the later stage of breaking, the air supplementing piston can be kept at the rear limit under the action of the piston limiting piece or under the action of the buffer spring at the compression limit, and as the movable stroke of the air supplementing piston is smaller than that of the air compressing cylinder, the air in the air supplementing chamber is compressed and supplemented into the air compressing chamber, and continuous air blowing is provided for the gaps at the later stage of breaking of the circuit breaker, so that dissipation of heat accumulated by electric arcs among the gaps is facilitated, sufficient medium recovery strength is facilitated to be established among the gaps so as to resist transient recovery voltage, and the breaking performance of the circuit breaker is improved; and moreover, the air supplementing chamber is communicated with the air pressing chamber only through the communication channel, the air in the air supplementing chamber is not easy to be heated by the electric arc, the temperature of the air blown to the electric arc in the later stage of switching off is lower, and a better arc extinguishing effect can be achieved.
As a preferred technical scheme: the inner cavity of the air supplementing cylinder is annular, and the air supplementing piston is an annular piston.
The beneficial effects are that: by adopting the technical scheme, the manufacturing and the assembly of the air supplementing piston are convenient, and the electric field uniformity is ensured.
As a preferred technical scheme: a limit column is arranged at the rear side of the air supplementing piston;
when the air supplementing piston is in the front limit, a movable interval is arranged between the rear end of the limit column and the spring seat, and the movable interval is used for providing a movement space for the air supplementing piston;
the piston limiting piece is formed by the limiting column.
The beneficial effects are that: by adopting the technical scheme, the device is simple in structure, convenient to manufacture and capable of providing reliable limiting for the air supplementing piston.
As a preferred technical scheme: the buffer spring is sleeved on the limiting column and is coaxially arranged with the limiting column.
The beneficial effects are that: by adopting the technical scheme, the limit column can provide guidance and righting for the buffer spring, so that the stability of the buffer spring is ensured.
As a preferred technical scheme: the air supplementing cylinder and the air compressing cylinder are of an integrated structure.
The beneficial effects are that: by adopting the technical scheme, the structure is simple, and the assembly is convenient.
As a preferred technical scheme: the cylinder wall of one side of the air supplementing cylinder, which is close to the axis of the air compressing cylinder, is provided with an annular interval with the cylinder wall of the air compressing cylinder.
The beneficial effects are that: by adopting the technical scheme, the annular interval can play a role in reducing weight, and is beneficial to blocking heat between the air supplementing cylinder and the air pressing cylinder, so that the temperature of gas in the air supplementing chamber is reduced.
As a preferred technical scheme: the air cylinder is sleeved on the outer side of the air cylinder seat, and the air supplementing cylinder is arranged on the radial outer side of the air cylinder.
The beneficial effects are that: the space of the radial outside of the air cylinder is more abundant, and the air supplementing cylinder is convenient to assemble by adopting the scheme.
As a preferred technical scheme: the communication channel is provided with a gas check valve which is communicated in one way from the air supplementing chamber to the air pressing chamber.
The beneficial effects are that: by adopting the technical scheme, the gas check valve can prevent gas in the air cylinder from flowing backwards into the air compensating cylinder in the brake separating process, and the design requirement on the stiffness coefficient of the buffer spring is reduced.
As a preferred technical scheme: the static arc contact is arranged in a guiding way along the front-back direction;
and a double-acting linkage structure is arranged between the static arc contact and the movable end component, and the double-acting linkage structure enables the arc extinguishing chamber to form a double-acting arc extinguishing chamber for driving the static arc contact to act when the movable end component acts.
The beneficial effects are that: by adopting the technical scheme, the switching-on and switching-off operation work required by the arc extinguish chamber can be effectively reduced through the double-acting structure, and the influence of the air compression resistance on the switching-off performance is reduced.
The above-described preferred embodiments may be employed alone, or if two or more embodiments can be combined, the combined embodiments will not be described in detail here, and this embodiment is incorporated in the description of the present patent.
The circuit breaker of the invention adopts the following technical scheme:
the circuit breaker comprises an arc extinguishing chamber and an operating mechanism, wherein the operating mechanism is used for driving the arc extinguishing chamber to be closed and opened;
an arc chute, comprising:
the shell is used for forming a closed air chamber for filling arc extinguishing gas; the shell is provided with a cylinder seat;
the movable end assembly comprises a pressure cylinder, a movable main contact and a movable arc contact;
the static end assembly comprises a static main contact and a static arc contact;
the air cylinder is assembled on the cylinder seat in a guiding way along the front-back direction, and moves forwards during closing and moves backwards during opening; a compressed air chamber is formed between the compressed air cylinder and the cylinder seat;
the air cylinder is provided with an air supplementing cylinder which extends along the front-back direction, an air supplementing piston is arranged in the air cylinder in a guiding way, and an air supplementing chamber is formed between the air supplementing piston and the air supplementing cylinder;
a communication channel is arranged between the air supplementing chamber and the air pressing chamber;
the rear of the air supplementing piston is provided with a buffer spring, the rear end of the buffer spring is provided with a spring seat, and the spring seat is used for providing support for the buffer spring;
the air supplementing piston is provided with a front limit position and a rear limit position on the movable stroke, wherein the front limit position is determined by the freely-stretched buffer spring, and the rear limit position is determined by a corresponding piston limit part or by the buffer spring at the compression limit;
the movable stroke of the air supplementing piston is smaller than that of the air pressing cylinder.
The beneficial effects are that: by adopting the technical scheme, the air supplementing cylinder and the air supplementing piston can form an air supplementing chamber, and the air supplementing chamber is communicated with the air pressing chamber through the communication channel; the air supplementing cylinder and the air pressing cylinder synchronously move backwards in the earlier stage of opening the brake, the air supplementing chamber is compressed, the air supplementing piston overcomes the elastic force of the buffer spring to move backwards under the action of air pressure in the air supplementing chamber, and the buffer spring plays a role in buffering, so that the air flow of the air pressing cylinder in the earlier stage of opening the brake is prevented from being greatly influenced; in the later stage of breaking, the air supplementing piston can be kept at the rear limit under the action of the piston limiting piece or under the action of the buffer spring at the compression limit, and as the movable stroke of the air supplementing piston is smaller than that of the air compressing cylinder, the air in the air supplementing chamber is compressed and supplemented into the air compressing chamber, and continuous air blowing is provided for the gaps at the later stage of breaking of the circuit breaker, so that dissipation of heat accumulated by electric arcs among the gaps is facilitated, sufficient medium recovery strength is facilitated to be established among the gaps so as to resist transient recovery voltage, and the breaking performance of the circuit breaker is improved; and moreover, the air supplementing chamber is communicated with the air pressing chamber only through the communication channel, the air in the air supplementing chamber is not easy to be heated by an electric arc, the temperature of the air blown to the electric arc in the later stage of switching off is lower, a better arc extinguishing effect can be achieved, and the problem that the switching-on and switching-off performances of the conventional circuit breaker are limited due to insufficient pressure of the arc extinguishing air in the later stage of switching off of the arc extinguishing chamber is solved.
As a preferred technical scheme: the inner cavity of the air supplementing cylinder is annular, and the air supplementing piston is an annular piston.
The beneficial effects are that: by adopting the technical scheme, the manufacturing and the assembly of the air supplementing piston are convenient, and the electric field uniformity is ensured.
As a preferred technical scheme: a limit column is arranged at the rear side of the air supplementing piston;
when the air supplementing piston is in the front limit, a movable interval is arranged between the rear end of the limit column and the spring seat, and the movable interval is used for providing a movement space for the air supplementing piston;
the piston limiting piece is formed by the limiting column.
The beneficial effects are that: by adopting the technical scheme, the device is simple in structure, convenient to manufacture and capable of providing reliable limiting for the air supplementing piston.
As a preferred technical scheme: the buffer spring is sleeved on the limiting column and is coaxially arranged with the limiting column.
The beneficial effects are that: by adopting the technical scheme, the limit column can provide guidance and righting for the buffer spring, so that the stability of the buffer spring is ensured.
As a preferred technical scheme: the air supplementing cylinder and the air compressing cylinder are of an integrated structure.
The beneficial effects are that: by adopting the technical scheme, the structure is simple, and the assembly is convenient.
As a preferred technical scheme: the cylinder wall of one side of the air supplementing cylinder, which is close to the axis of the air compressing cylinder, is provided with an annular interval with the cylinder wall of the air compressing cylinder.
The beneficial effects are that: by adopting the technical scheme, the annular interval can play a role in reducing weight, and is beneficial to blocking heat between the air supplementing cylinder and the air pressing cylinder, so that the temperature of gas in the air supplementing chamber is reduced.
As a preferred technical scheme: the air cylinder is sleeved on the outer side of the air cylinder seat, and the air supplementing cylinder is arranged on the radial outer side of the air cylinder.
The beneficial effects are that: the space of the radial outside of the air cylinder is more abundant, and the air supplementing cylinder is convenient to assemble by adopting the scheme.
As a preferred technical scheme: the communication channel is provided with a gas check valve which is communicated in one way from the air supplementing chamber to the air pressing chamber.
The beneficial effects are that: by adopting the technical scheme, the gas check valve can prevent gas in the air cylinder from flowing backwards into the air compensating cylinder in the brake separating process, and the design requirement on the stiffness coefficient of the buffer spring is reduced.
As a preferred technical scheme: the static arc contact is arranged in a guiding way along the front-back direction;
and a double-acting linkage structure is arranged between the static arc contact and the movable end component, and the double-acting linkage structure enables the arc extinguishing chamber to form a double-acting arc extinguishing chamber for driving the static arc contact to act when the movable end component acts.
The beneficial effects are that: by adopting the technical scheme, the switching-on and switching-off operation work required by the arc extinguish chamber can be effectively reduced through the double-acting structure, and the influence of the air compression resistance on the switching-off performance is reduced.
The above-described preferred embodiments may be employed alone, or if two or more embodiments can be combined, the combined embodiments will not be described in detail here, and this embodiment is incorporated in the description of the present patent.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the circuit breaker of the present invention;
FIG. 2 is an enlarged view of a portion of the pressure and make-up cylinders of FIG. 1;
fig. 3 is a schematic structural view of embodiment 2 of the circuit breaker of the present invention;
FIG. 4 is an enlarged view of a portion of the pressure and make-up cylinders of FIG. 3;
fig. 5 is a schematic structural view of embodiment 3 of the circuit breaker of the present invention;
fig. 6 is an enlarged view of a portion of the double-acting linkage of fig. 5.
The names of the corresponding components in the figures are: 10-explosion chamber, 11-shell, 21-stationary main contact, 22-stationary arc contact, 23-stationary end contact seat, 31-air compressing cylinder, 32-moving main contact, 33-moving arc contact, 34-nozzle, 35-air cylinder seat, 36-air compressing chamber, 37-insulating pull rod, 38-air supplementing cylinder, 39-air supplementing piston, 310-buffer spring, 311-limit column, 312-annular space, 313-air supplementing chamber, 314-communication hole, 40-operating mechanism, 50-gas check valve, 51-guide column, 52-valve plate, 53-reset spring, 60-link rod and 61-power spring.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises a depicted element.
In the description of the present invention, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
In the description of the present invention, unless explicitly stated and limited otherwise, the term "provided" as may occur, for example, as an object of "provided" may be a part of a body, may be separately arranged from the body, and may be connected to the body, and may be detachably connected or may be non-detachably connected. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
The present invention is described in further detail below with reference to examples.
Example 1 of the circuit breaker in the present invention:
as shown in fig. 1, the circuit breaker includes an arc chute 10 and an operating mechanism 40, and the operating mechanism 40 is used to drive the arc chute 10 to be closed and opened. The operating mechanism 40 may be a prior art operating mechanism, the specific principles of which are not described in detail herein.
The arc extinguishing chamber 10 comprises a housing 11, wherein the housing 11 is used for forming a closed air chamber for filling arc extinguishing gas; the front end of the shell 11 is provided with a static end assembly, the static end assembly comprises a static main contact 21 and a static arc contact 22, and the static main contact 21 and the static arc contact 22 are fixed on a static end contact seat 23. The rear end of the housing 11 is provided with a moving end assembly comprising a pressure cylinder 31, a moving main contact 32, a moving arc contact 33 and a nozzle 34. The rear end of the housing 11 is fixedly provided with a cylinder block 35, and the cylinder block 31 is sleeved outside the cylinder block 35 to form a compressed air chamber 36 with the cylinder block 35. The air cylinder 31 is connected with the operating mechanism 40 through the insulating pull rod 37, so that the whole movable end assembly is driven by the operating mechanism 40 to move back and forth to finish switching on and off, and moves forward during switching on and moves backward during switching off. It should be noted that, the moving main contact 32, the moving arc contact 33, the static arc contact 22 and the static main contact 21 are all in the prior art, for example, the structures in the cited reference documents of the background art may be adopted, and the structures are all schematic in the drawings of the present invention, and those skilled in the art should not be aware that they are not limited to specific contact structures.
The movable end assembly further comprises a supplementing cylinder 38, a supplementing piston 39, a buffer spring 310 and a limiting column 311. The air supplementing cylinder 38 and the air compressing cylinder 31 are of an integrated structure, are arranged on the radial outer side of the air compressing cylinder 31, and have an annular inner cavity; the cylinder wall of the side of the air compensating cylinder 38 near the axis of the air compressing cylinder 31 has an annular space 312 between the cylinder wall of the air compressing cylinder 31. The air supply piston 39 is an annular piston, and is fitted in the air supply cylinder 38 in a forward and backward direction.
As shown in fig. 2, a gas-replenishing chamber 313 is formed between the gas-replenishing piston 39 and the gas-replenishing cylinder 38. The front end of the air compressing cylinder 31 is connected with the front end of the air supplementing cylinder 38, a communication hole 314 is arranged at the connected position, and the communication hole 314 forms a communication channel, so that the air compressing chamber 36 and the air supplementing chamber 313 can be mutually communicated. The communication holes 314 may be uniformly distributed in the circumferential direction of the cylinder 31 in order to ensure the gas flow area.
The rear side of the air supplementing piston 39 is provided with the limiting column 311, the limiting column 311 is fixed on the air supplementing piston 39 in a rearwardly overhanging way, and the buffer spring 310 is coaxially sleeved on the limiting column 311. The buffer spring 310 has a front end supported on the air compensating piston 39 and a rear end supported on the housing 11 of the arc extinguishing chamber 10, and a corresponding portion of the rear end of the housing 11 forms the cylinder block 35. Of course, in order to improve the accuracy of the actuation of the air make-up piston 39, the front end of the buffer spring 310 may be fixed to the air make-up piston 39 and the rear end may be fixed to the cylinder block 35. When the air supplementing piston 39 is not stressed, the free extension state of the buffer spring 310 determines the front limit of the air supplementing piston 39, as shown in the lower part of fig. 1; the above-mentioned limit post 311 forms a piston limit member for limiting the rearward movement limit of the piston, and determining the rear limit of the piston, as shown in the upper portion of fig. 1. When the air supplementing piston 39 is at the front limit, a movable interval is arranged between the rear end of the limit post 311 and the spring seat, and the movable interval is used for providing a movement space for the air supplementing piston 39. The free length of the buffer spring 310 and the length of the limit post 311 are designed according to the opening and closing stroke of the arc extinguishing chamber 10, so that the moving stroke of the air supplementing piston 39 is smaller than that of the air compressing cylinder 31, and thus, after the air supplementing piston 39 stops moving in the later stage of opening the arc extinguishing chamber, the air compressing cylinder 31 and the air supplementing cylinder 38 still can move backwards relative to the air supplementing piston 39, thereby compressing the volume of the air supplementing chamber 313, and enabling the air in the air supplementing cylinder 38 to enter the air compressing cylinder 31 through the communication hole 314 to supplement air for the air compressing cylinder 31.
In the switching-on state of the arc extinguishing chamber 10, the moving main contact 32 of the arc extinguishing chamber 10 is conducted with the fixed main contact 21, and the moving arc contact 33 is conducted with the fixed arc contact 22. The pressure chamber 36 and the air supply chamber 313 are filled with arc extinguishing gas, and the air supply piston 39 is positioned in the air supply cylinder 38 in the front-rear direction under the restriction of the buffer spring 310 in a free state, and is at the front limit. In the front section of the switching-off action of the arc-extinguishing chamber 10, the operating mechanism pulls the movable end assembly to move backward, the movable arc contact 33 leaves the stationary arc contact 22 and generates an arc, and then the movable end side of the arc-extinguishing chamber 10 and the stationary end side of the arc-extinguishing chamber 10 are disconnected. At this time, the quenching gas in the pressure cylinder 31 starts to blow out the arc by the compression of the cylinder block 35. At this time, although the air charge cylinder 38 communicates with the air charge cylinder 31 through the communication hole 314, the quenching gas in the air charge cylinder 31 does not enter the air charge cylinder 38 too much because the quenching piston 39 and the buffer spring 310 in the air charge cylinder 38 are also pressed by the quenching gas in the air charge cylinder 38 in synchronization in the stage before opening the gate, and the air pressures of the air charge cylinder 31 and the air charge cylinder 38 are nearly balanced. When the switching-off action of the arc extinguishing chamber 10 enters the rear section, the electric arc between the movable arc contact 33 and the static arc contact 22 is pulled to be almost extinguished, the arc extinguishing gas in the air supplementing cylinder 38 pushes the air supplementing piston 39 and the buffer spring 310 to be compressed to the limit position of the limit post 311, at the moment, the air supplementing piston 39 is propped up to be dead, and is kept at the rear limit position, the air supplementing cylinder 38 starts to supplement air to the air compressing cylinder 31 through an air channel, so that the effects of supplementing pressure and boosting pressure are achieved, and the electric arc is continuously blown out until the switching-off action is finished. Of course, the timing of the air charge cylinder 38 may be determined by the parameters of the buffer spring 310.
Example 2 of the circuit breaker in the present invention:
as shown in fig. 3 and 4, the present embodiment is different from embodiment 1 in that in the present embodiment, a gas check valve 50 is provided at an orifice of a communication hole 314 at one end of a plenum chamber 36, and the gas check valve 50 includes a guide post 51, a valve plate 52, and a return spring 53 for achieving unidirectional conduction from a make-up chamber 313 to the plenum chamber 36. The gas check valve 50 can avoid the gas in the air cylinder 31 from flowing back into the air cylinder 38 due to too soft spring in the air cylinder 38 during the opening process, which is beneficial to reducing the design requirement on the stiffness coefficient of the buffer spring 310.
When the circuit breaker works, the gas supplementing chamber 313 and the gas supplementing chamber 36 are mutually isolated under the action of the gas check valve 50, and after the gas supplementing piston 39 moves to the rear limit position, the pressure of arc extinguishing gas in the gas supplementing chamber 313 rises along with the continuous backward movement of the gas supplementing cylinder 31 and the gas supplementing cylinder 38, the gas check valve 50 is jacked up, and the gas supplementing to the gas supplementing chamber 36 is started.
Example 3 of the circuit breaker in the present invention:
as shown in fig. 5 and 6, the present embodiment is different from embodiment 2 in that, in the present embodiment, the static arcing contacts 22 are arranged in a guide in the front-rear direction; a double-acting linkage structure is arranged between the static arc contact 22 and the nozzle 34 of the movable end assembly, and the double-acting linkage structure enables the arc extinguishing chamber 10 to form a double-acting arc extinguishing chamber 10 for driving the static arc contact 22 to act when the movable end assembly acts. The double-acting linkage structure adopts a connecting rod transmission mode and comprises a linkage rod 60, wherein one end of the linkage rod 60, which is close to the movable end assembly, is hinged on the nozzle 34 of the movable end assembly, and the other end of the linkage rod is hinged on the middle connecting rod 62; the middle part of the middle connecting rod 62 is hinged on the shell 11, and a driven rod 63 is hinged between one end far away from the linkage rod 60 and the static arc contact 22. The forward movement of the spout 34 will drive the static contact 22 toward the moving end assembly via the linkage. It should be noted that, the linkage rod 60, the intermediate link rod 62, and the driven rod 63 in fig. 6 only schematically illustrate the connection relationship between the nozzle 34 and the static arc contact 22, and do not represent the actual structure or the actual positional relationship between the parts, for example, in the illustrated state, the driven rod 63 is actually connected to the static arc contact 22 near the moving end assembly in the closing position, and the driven rod 63 in the drawing is merely for illustrating the connection relationship with the static arc contact 22. In order to reduce the breaking work of the circuit breaker, a power-assisted spring 61 is arranged on a linkage rod 60 of the circuit breaker, the power-assisted spring 61 is stretched to store energy when the arc-extinguishing chamber 10 is switched on, and contracts to rebound and releases energy when the arc-extinguishing chamber 10 is switched off.
Of course, in other embodiments, the double-acting linkage structure may also adopt any double-acting linkage form in the prior art, for example, a linkage form, a rack-and-pinion transmission form, a shifting fork sliding chute linkage form, and the like described in the cited reference of the background art. In addition, in other embodiments, the arc extinguishing chamber adopting the double-acting linkage structure can be provided without the gas check valve 50.
Example 4 of the circuit breaker in the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, the inner cavity of the air compensating cylinder 38 is annular, the air compensating piston 39 is annular, while in this embodiment, the air compensating cylinders are uniformly distributed around the air compressing cylinder 31, the inner cavity of each air compensating cylinder is cylindrical, and correspondingly, the air compensating piston is cylindrical.
Example 5 of the circuit breaker in the present invention:
the present embodiment is different from embodiment 1 in that in embodiment 1, the air supplementing piston 39 determines the rear limit position by means of the limit post 311 thereon, and the limit post 311 forms a piston limit member; in this embodiment, the limiting post 311 is fixed on the housing 11, and the front end of the limiting post 311 is used for being in stop fit with the rear end face of the air compensating piston 39.
Of course, in other embodiments, the piston stopper may be replaced by other forms, for example, a stopper protruding toward the axis of the housing 11 is provided on the inner peripheral surface of the housing 11. In addition, in other embodiments, a boss may be disposed inside the rear end cover of the housing 11, where the boss corresponds to the limiting post 311 and is used for stopping the limiting post 311.
In addition, in other embodiments, the rear limit position of the air-supplementing piston 39 may be determined by the buffer spring 310 being at the compression limit, and the air-supplementing piston 39 may be limited by the buffer spring 310 being in a parallel state (a state in which the respective coils are in contact with each other in the axial direction of the spring). Alternatively, the air make-up piston 39 may be designed with a suitable spring rate to provide sufficient support against the cushion spring compressed to a certain degree to be at the rear limit.
Example 6 of the circuit breaker in the present invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, the air compensating cylinder 38 and the air compressing cylinder 31 are integrally formed, but in this embodiment, the air compensating cylinder 38 and the air compressing cylinder 31 are separately arranged, the front end of the air compressing cylinder 31 is provided with an outer flange, a plurality of air compensating cylinders 38 are circumferentially arranged around the air compressing cylinder 31, and each air compensating cylinder 38 is fixed on the outer flange. At this time, a communication passage between the air supply chamber 313 and the air pressure chamber 36 may be provided on the outer flange.
Example 7 of the circuit breaker of the invention:
the present embodiment is different from embodiment 1 in that in embodiment 1, the cylinder block 31 is sleeved outside the cylinder block 35, the air compensating cylinder 38 is provided radially outside the cylinder block 31, whereas in this embodiment, the cylinder block 35 is of a cylindrical structure, the cylinder block 35 is sleeved inside the cylinder block 35, and the air compensating cylinder 38 is provided inside the cylinder block of the cylinder block 31.
Embodiments of the arc chute of the present invention: the arc extinguishing chamber 10 described in any of the embodiments of the circuit breaker is not described in detail herein.
The arc extinguishing chamber 10 in the present invention may be an arc extinguishing chamber using carbon dioxide gas, nitrogen gas, halogenated hydrocarbon insulating gas, or other green environment-friendly arc extinguishing insulating gas having no GWP value or low GWP, or may be an arc extinguishing chamber using sulfur hexafluoride as arc extinguishing insulating gas, and the former may better exert the advantage of pressure compensation in the late opening stage.
The above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and the patent protection scope of the present application is defined by the claims, and all equivalent structural changes made by the specification and the attached drawings of the present application should be included in the protection scope of the present application.
Claims (10)
1. An arc chute, comprising:
the shell is used for forming a closed air chamber for filling arc extinguishing gas; the shell is provided with a cylinder seat;
the movable end assembly comprises a pressure cylinder, a movable main contact and a movable arc contact;
the static end assembly comprises a static main contact and a static arc contact;
the air cylinder is assembled on the cylinder seat in a guiding way along the front-back direction, and moves forwards during closing and moves backwards during opening; a compressed air chamber is formed between the compressed air cylinder and the cylinder seat;
it is characterized in that the method comprises the steps of,
the air cylinder is provided with an air supplementing cylinder which extends along the front-back direction, an air supplementing piston is arranged in the air cylinder in a guiding way, and an air supplementing chamber is formed between the air supplementing piston and the air supplementing cylinder;
a communication channel is arranged between the air supplementing chamber and the air pressing chamber;
the rear of the air supplementing piston is provided with a buffer spring, the rear end of the buffer spring is provided with a spring seat, and the spring seat is used for providing support for the buffer spring;
the air supplementing piston is provided with a front limit position and a rear limit position on the movable stroke, wherein the front limit position is determined by the freely-stretched buffer spring, and the rear limit position is determined by a corresponding piston limit part or by the buffer spring at the compression limit;
the movable stroke of the air supplementing piston is smaller than that of the air pressing cylinder.
2. The arc chute of claim 1 wherein the inner cavity of the gas compensating cylinder is annular and the gas compensating piston is an annular piston.
3. The arc chute according to claim 2, wherein a limit post is provided on the rear side of the gas-make-up piston;
when the air supplementing piston is in the front limit, a movable interval is arranged between the rear end of the limit column and the spring seat, and the movable interval is used for providing a movement space for the air supplementing piston;
the piston limiting piece is formed by the limiting column.
4. The arc chute of claim 3 wherein the buffer spring is sleeved on the limit post and is coaxially disposed with the limit post.
5. The arc chute as in any one of claims 2 to 4 wherein the make-up cylinder is of unitary construction with the pressure cylinder.
6. The arc chute as in any one of claims 2 to 4 wherein the side of the supplementary cylinder adjacent the cylinder axis has an annular space between the cylinder wall of the cylinder and the cylinder wall of the cylinder.
7. The arc chute as in any one of claims 1 to 4 wherein the cylinder block is sleeved outside the cylinder block and the supplementary cylinder is disposed radially outside the cylinder block.
8. The arc extinguishing chamber according to any one of claims 1 to 4, wherein the communication passage is provided with a gas check valve, and the gas check valve is in one-way communication from the gas supplementing chamber to the gas pressing chamber.
9. The arc chute as in any one of claims 1 to 4 wherein the static arcing contacts are oriented in a fore-aft direction;
and a double-acting linkage structure is arranged between the static arc contact and the movable end component, and the double-acting linkage structure enables the arc extinguishing chamber to form a double-acting arc extinguishing chamber for driving the static arc contact to act when the movable end component acts.
10. The circuit breaker comprises an arc extinguishing chamber and an operating mechanism, wherein the operating mechanism is used for driving the arc extinguishing chamber to be closed and opened;
characterized in that the arc extinguishing chamber is an arc extinguishing chamber according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010791222.5A CN114068241B (en) | 2020-08-07 | 2020-08-07 | Arc extinguishing chamber and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010791222.5A CN114068241B (en) | 2020-08-07 | 2020-08-07 | Arc extinguishing chamber and circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114068241A CN114068241A (en) | 2022-02-18 |
| CN114068241B true CN114068241B (en) | 2024-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010791222.5A Active CN114068241B (en) | 2020-08-07 | 2020-08-07 | Arc extinguishing chamber and circuit breaker |
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| Country | Link |
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| CN (1) | CN114068241B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1438590A (en) * | 1972-12-08 | 1976-06-09 | Fuji Electric Co Ltd | Electrical circuit breaker |
| US4438308A (en) * | 1980-04-25 | 1984-03-20 | Bbc Brown, Boveri & Company, Limited | Puffer piston circuit breaker |
| US4459447A (en) * | 1982-01-27 | 1984-07-10 | Mitsubishi Denki Kabushiki Kaisha | Self extinguishing type gas circuit breaker |
| JPH07312154A (en) * | 1994-05-17 | 1995-11-28 | Toshiba Corp | Puffer type gas circuit breaker |
| JPH08279325A (en) * | 1995-04-05 | 1996-10-22 | Toshiba Corp | Buffer type gas-blast circuit breaker |
| JPH09213180A (en) * | 1996-01-30 | 1997-08-15 | Toshiba Corp | Gas-blast circuit-breaker |
| CH689363A5 (en) * | 1993-05-07 | 1999-03-15 | Gec Alsthom T & D Sa | Breaker for high or medium voltage gas blowing. |
| JP2002124167A (en) * | 2000-10-17 | 2002-04-26 | Mitsubishi Electric Corp | Buffer gas-blast circuit breaker |
-
2020
- 2020-08-07 CN CN202010791222.5A patent/CN114068241B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1438590A (en) * | 1972-12-08 | 1976-06-09 | Fuji Electric Co Ltd | Electrical circuit breaker |
| US4438308A (en) * | 1980-04-25 | 1984-03-20 | Bbc Brown, Boveri & Company, Limited | Puffer piston circuit breaker |
| US4459447A (en) * | 1982-01-27 | 1984-07-10 | Mitsubishi Denki Kabushiki Kaisha | Self extinguishing type gas circuit breaker |
| CH689363A5 (en) * | 1993-05-07 | 1999-03-15 | Gec Alsthom T & D Sa | Breaker for high or medium voltage gas blowing. |
| JPH07312154A (en) * | 1994-05-17 | 1995-11-28 | Toshiba Corp | Puffer type gas circuit breaker |
| JPH08279325A (en) * | 1995-04-05 | 1996-10-22 | Toshiba Corp | Buffer type gas-blast circuit breaker |
| JPH09213180A (en) * | 1996-01-30 | 1997-08-15 | Toshiba Corp | Gas-blast circuit-breaker |
| JP2002124167A (en) * | 2000-10-17 | 2002-04-26 | Mitsubishi Electric Corp | Buffer gas-blast circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114068241A (en) | 2022-02-18 |
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