CN116825572A - Airflow control structure, self-energy arc extinguishing device and method - Google Patents
Airflow control structure, self-energy arc extinguishing device and method Download PDFInfo
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- CN116825572A CN116825572A CN202310913480.XA CN202310913480A CN116825572A CN 116825572 A CN116825572 A CN 116825572A CN 202310913480 A CN202310913480 A CN 202310913480A CN 116825572 A CN116825572 A CN 116825572A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 5
- 230000008602 contraction Effects 0.000 claims description 5
- 230000008033 biological extinction Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 abstract description 10
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 230000002829 reductive effect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 97
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H01H33/22—Selection of fluids for arc-extinguishing
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- Circuit Breakers (AREA)
Abstract
The invention discloses an airflow control structure, a self-energy arc extinguishing device and a self-energy arc extinguishing method, which belong to the field of circuit breakers, wherein a main channel communicated with an arc area and a high-voltage channel communicated with a pressurizing area of an expansion chamber are adopted, a gradual change structure is formed in the main channel, and an expansion structure communicated with a shell cavity of the circuit breaker is formed in an expansion section of the gradual change structure; by adopting the design, the gas in the arc area can flow to the high-pressure channel through the main channel so as to enter the pressurizing area; after the electric arc is extinguished, the gas in the pressurizing area is accelerated in the main channel after passing through the high-pressure channel, the pressure is reduced, so that the gas in the expansion chamber flows into the main channel to prevent the gas from the pressurizing area from flowing into the electric arc area; the unidirectional flow of the gas from the arc area to the pressurizing area is realized, and the phenomenon of fracture breakdown caused by the backflow of the gas after the arc is extinguished is prevented; the structure is simple in principle, can solve the problem of high-temperature gas flow direction fracture in the power frequency stage, and has good popularization and application values.
Description
Technical Field
The invention belongs to the field of circuit breakers, and particularly relates to an airflow control structure, a self-energy arc extinguishing device and a self-energy arc extinguishing method.
Background
In the gas-insulated high-voltage switch, the pressure of gas is increased in an expansion chamber in the arc extinguishing process, and when the current is at zero point, the high-pressure gas flows through the fracture to rapidly take away thermal free molecules among the fracture, so that the aim of arc extinguishing is fulfilled. The national standard of circuit breakers specifies that the circuit breaker should also withstand a power frequency voltage of 100ms after the arc has been extinguished. Because the fracture is subjected to the action of an electric arc, the temperature is higher, and if the fracture is disturbed by high-temperature gas, the fracture is easy to break down again. Therefore, the gas in the other region cannot flow to the break during the period from the start of the opening operation of the circuit breaker to 100ms after the arc is extinguished.
When the gas in the expansion chamber flows out for a while, the gas pressure therein decreases, and at this time, if the gas pressure in other areas of the arc extinguishing chamber is higher than the expansion chamber pressure, high-temperature gas may flow to the fracture. This typically occurs over a period of time after the arc is extinguished, which may lead to the fracture breaking again, resulting in failure of the break.
Disclosure of Invention
In order to overcome the technical defects, the invention provides an airflow control structure, a self-energy arc extinguishing device and a self-energy arc extinguishing method, which can solve the technical problem that the circuit breaker is broken down due to gas backflow in the power frequency stage because the prior art is not provided with a structure for reversing gas flow.
In order to achieve the above purpose, the present invention adopts the following technical contents:
an airflow control structure includes a main passage communicating with an arc region, a high pressure passage communicating with a pressurizing region of an expansion chamber; a gradual change structure is formed in the main channel; the expansion section of the gradual change structure forms an expansion structure communicated with a shell cavity of the circuit breaker, and the contraction section is communicated with the high-voltage channel; the gas from the arc region and the gas from the pressurized region are able to meet in the expanded configuration.
Further, a housing chamber of the circuit breaker communicates with the expanding structure through a low pressure passage.
Further, the main channel comprises an inlet end, a gradual change structure and an outlet end which are communicated in sequence, wherein the inlet end is communicated with the electric arc area; the outlet end is in communication with the high pressure passage.
Further, the cross-sectional area b of the inlet end 1 Is larger than the sectional area b of the gradual change structure 2 。
Further, the cross-sectional area b of the inlet end 1 Cross-sectional area b of the graded structure 2 The following conditions are also satisfied:
b 2 ≥1/2b 1 。
further, the cross-sectional area b of the outlet end 3 Is larger than the sectional area b of the gradual change structure 2 。
Further, an included angle F formed by the first contour surface on the contraction section and the central axis of the main channel and an included angle E formed by the second contour surface on the expansion section and the central axis of the main channel are acute angles, and the included angle F is larger than the included angle E.
Further, the main channel is surrounded by a part; the outlet end of the main channel is provided with a flow dividing piece; the flow dividing piece is connected to the side wall of the part and is in a cone shape.
An airflow control method based on the airflow control structure comprises the following steps:
in the arc combustion phase, the gas from the arc region flows through the main channel to the high pressure channel to enter the pressurizing region of the expansion chamber;
during the arc extinction phase, the gas from the pressurized region is accelerated through the high pressure channel via the gradual change structure in the main channel, intersects the gas from the arc region in the expanded structure, and finally flows to the housing chamber of the circuit breaker.
A self-energy arc extinguishing device comprises an arc extinguishing device body and the airflow control structure.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an air flow control structure, which adopts a main channel communicated with an arc area and a high-pressure channel communicated with a pressurizing area of an expansion chamber, wherein a gradual change structure is formed in the main channel, and an expansion structure communicated with a shell cavity of a circuit breaker is formed in an expansion section of the gradual change structure; by adopting the design, the gas in the arc area can flow to the high-pressure channel through the main channel so as to enter the pressurizing area; after the electric arc is extinguished, the gas in the pressurizing area is accelerated in the main channel after passing through the high-pressure channel, the pressure is reduced, so that the gas in the expansion chamber flows into the main channel to prevent the gas from the pressurizing area from flowing into the electric arc area; therefore, the unidirectional flow of the gas from the arc area to the pressurizing area is realized, and the phenomenon that fracture breakdown occurs due to the backflow of the gas after the arc is extinguished is prevented; the structure is simple in principle, can solve the problem of high-temperature gas flow direction fracture in the power frequency stage, and has good popularization and application values.
Preferably, the main channel comprises an inlet end, a gradual change structure and an outlet end, wherein the sectional area of the inlet end and the sectional area of the outlet end are larger than the sectional area of the gradual change structure, and meanwhile, the sectional area of the gradual change structure is not smaller than the sectional area of the inlet end by 1/2; therefore, the sectional area of the gradual change structure is ensured to be minimum, so that the gas flowing through the gradual change structure can be accelerated, and meanwhile, the smoothness of the gas flowing through the gradual change structure is met, so that the flow efficiency of the gas from the inlet end of the main channel to the high-pressure channel is not influenced.
Preferably, the gradual change structure in the invention comprises a first contour surface and a second contour surface which are connected; the included angle F between the first contour surface and the central axis of the main channel and the included angle E between the first contour surface and the central axis of the main channel are acute angles, and the included angle F is larger than the included angle E; the design is adopted to be matched with the flow dividing piece, so that the gas from the inlet end of the main channel is guided to enter the high-pressure channel better; the cross-sectional area formed between the flow divider and the first profile surface should gradually and slowly increase to the cross-section of the outlet end, improving the flow smoothness of the gas.
The invention also provides an airflow control method based on the airflow control structure, which considers the problem of reverse flow of the gas, can effectively prevent the phenomenon that the high-temperature gas flows to a fracture (an electric arc area) in the power frequency stage, and can avoid the problem of breaking failure caused by breakdown of the fracture again.
The invention also provides a self-energy arc extinguishing device which comprises an arc extinguishing device body and the airflow control structure, and the self-energy arc extinguishing device has better capability of preventing the gas from flowing backwards and improves the success rate of disconnection due to the adoption of the airflow control structure.
Drawings
FIG. 1 is a schematic diagram of an airflow control structure according to an embodiment of the present invention, which is an arc combustion stage;
fig. 2 is a schematic structural diagram of an airflow control structure according to an embodiment of the present invention, which is an arc extinguishing stage;
FIG. 3 is a simulated view of the airflow field during the arc combustion phase provided by an embodiment of the present invention;
fig. 4 is a simulation diagram of an airflow field during an arc extinction stage according to an embodiment of the present invention.
Reference numerals:
1. a main channel; 2. a part; 3. a low pressure passage; 4. a high pressure passage; 5. a part side wall; 6. a first profile surface; 7. a second profile surface; 8. an expanding structure; 9. a shunt.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the following specific embodiments are used for further describing the invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides an airflow control structure, which comprises a main channel 1 communicated with an arc area, wherein the main channel 1 is surrounded by a part 2, and a high-pressure channel 4 communicated with a pressurizing area of an expansion chamber; a gradual change structure with the diameter changing from large to small to large is formed in the main channel 1; the expansion section of the gradual change structure forms an expansion structure 8 communicated with a shell cavity of the circuit breaker, and the contraction section is communicated with the high-voltage channel 4; the gas from the arc zone and the gas from the pressurized zone can meet in said expanding structure 8, where the housing chamber of the circuit breaker communicates with the expanding structure 8 through the low-pressure channel 3.
The main channel 1 comprises an inlet end, a gradual change structure and an outlet end, wherein the inlet end is communicated with the arc area; the expanding structure 8 is located between the inlet end and the tapering structure; the gradual change structure is communicated with the outlet end; the outlet end communicates with the high pressure channel 4.
Cross-sectional area b of inlet end 1 Is larger than the sectional area b of the gradual change structure 2 Cross-sectional area b of the outlet end 3 Is larger than the sectional area b of the gradual change structure 2 。
Cross-sectional area b of inlet end 1 Cross-sectional area b of graded structure 2 The following conditions are also satisfied:
b 2 ≥1/2b 1 。
the gradual change structure comprises a first contour surface 6 on the contraction section and a second contour surface 7 on the expansion section; the included angle F between the first contour surface 6 and the central axis of the main channel 1 and the included angle E between the first contour surface 7 and the central axis of the main channel 1 are acute angles, and the included angle F is larger than the included angle E.
The outlets of the main channel 1 and the high-pressure channel 4 are provided with a flow dividing piece 9; the shunt piece 9 is located on the part side wall 5 of the part 2 and is in a cone shape, the shunt piece 9 and the central axis of the main channel 1 are located on the same straight line, and the shunt piece 9 is arranged in a rotationally symmetrical mode relative to the central axis of the main channel 1.
The invention also provides an airflow control method based on the airflow control structure, which comprises the following steps:
in the arc combustion phase, the gas from the arc zone flows through the main channel 1 to the high pressure channel 4 to enter the supercharging zone of the expansion chamber;
during the arc extinction phase, the gas coming from the pressurized zone is accelerated through the high-pressure channel 4, through the main channel 1, and meets the gas coming from the arc zone in the expansion structure 8, eventually flowing towards the housing chamber of the circuit breaker.
The invention also provides a self-energy arc extinguishing device which comprises an arc extinguishing device body and the airflow control structure.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present 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 those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 of ordinary skill in the art according to the specific circumstances.
The invention is described in further detail below with reference to the attached drawing figures:
examples
In combination with the background art, the prior art does not have a structure for reverse flow of gas, which may cause the technical problem that the breaker breaks down due to gas backflow in the power frequency stage. The realization mode is that a pipeline with a variable diameter and a throat part is arranged, and a channel communicated with a low-pressure area is arranged in the area where the diameter of the pipeline is increased. As the gas flows through the throat region, the velocity increases; the greater the gas flow rate, the lower the gas pressure, and a relatively low pressure region of gas pressure may be formed in the vicinity of the passage communicating with the low pressure region. The gas on both sides of the pipe flows to the low pressure zone and is discharged from the channel into another space. The specific structure of this embodiment includes a main passage 1, a low-pressure passage 3, a high-pressure passage 4, a first contour surface 6, a second contour surface 7, an expanding structure 8, and a flow divider 9. In order to more clearly describe the technical solution, the following explanation is given for related terms:
expansion chamber: a chamber in the circuit breaker that generates and temporarily stores high pressure gas. And at the current zero point, the thermal free state molecules between the fractures are rapidly taken away by utilizing the pressure difference between the high-pressure gas in the expansion chamber and the external gas.
Fracture: the space between two conductive contacts in a circuit breaker with a voltage difference.
The structural shape and positional connection of the above components are further described below with reference to the accompanying drawings:
as shown in fig. 1, the present embodiment provides an air flow control structure having a main passage 1 surrounded by a part 2, and a high-pressure passage 4 communicating with the main passage 1. The end A1 of the main channel 1 is connected with a fracture (namely an arc area) of the arc extinguishing chamber, and a low-voltage channel 3 is arranged between the end A1 of the main channel 1 and the high-voltage channel 4, one end of the low-voltage channel 3 is connected with the main channel 1, and the other end is connected with a shell cavity of the circuit breaker. The air pressure in the cavity of the breaker housing is the inflation pressure P1 of the breaker.
During the arc combustion phase, a large amount of high temperature and high pressure gas is generated at the fracture (i.e., arc region), and part of the gas enters the expansion chamber to promote the pressure rise, and part of the gas enters the main channel 1. A small portion of the high temperature gas flowing through the main channel 1 flows through the low pressure channel 3 to the housing chamber of the circuit breaker and the remaining gas flows into the high pressure channel 4 into the plenum area of the expansion chamber.
The part 2 has an axis A1-A2 as the central axis. The cross-sectional area of the part 2 between the low pressure channel 3 and the high pressure channel 4 is smaller than the cross-sectional area of the part between the low pressure channel 3 and the end A1, but the ratio between the cross-sectional area of the minimum D2 and the cross-sectional area of the end D1 should not be smaller than half in order to avoid affecting the flow efficiency of the air flow from the end A1 to the high pressure channel 4.
The angle between the second contour surface 7 of the main channel 1, which transitions from the part D1 to the part D2, and the central axis A1-A2 is an angle F, the angle between the first contour surface 6 of the transition from the part D2 to the part D3 and the central axis A1-A2 is an angle E, the angles E and F should be acute angles, and the value of the angle E should be smaller than the value of the angle F.
The main channel 1 also has a splitter 9 near the end A2, the splitter 9 being located on the part side wall 5 of the part 2 in the form of a pointed projection, rotationally symmetrical about the central axis A1-A2. Here, the purpose of the shunt 9 is to: the air flow from the A1 end is guided better into the high-pressure channel 4. Part D3 is located at the junction of the high pressure passage 4 and the main passage 1. The section area of the D3 portion should be larger than the section area of the D2 portion, ensuring that the section area of the D2 portion is the smallest section area between the main channel 1 and the high pressure channel 4. The dimensions of the shunt 9 should be such that the cross-sectional area formed between it and the first contour surface 6 should gradually increase slowly to the portion D3, which usually requires that the value of the angle E should not be too large to be achieved, which is why the value of the angle E should be smaller than the value of the angle F. The purpose of this design is that the gas flow rate does not increase too much after passing the section of the D2 section from the A1 end gas, so that the gas pressure after entering the high pressure channel 4 drops too much. This may cause the gas of higher pressure in the pressurizing area connected to the high-pressure passage 4 to flow to the vicinity of the portion D3, interfering with the gas flowing from A1 to D3, resulting in a poor gas flow.
As shown in fig. 2, after the arc is extinguished for a period of time (about tens of milliseconds), a gas with a higher gas pressure is still retained in the high-pressure channel 4, and at this time, the arc area connected to the A1 end disappears due to the pressure build-up source, and the arc blowing process of the expansion chamber is performed, the gas pressure is lower, and the gas flows from the high-pressure channel 4 to the arc area at the A1 end.
The gas of the high-pressure passage 4 flows to the arc region, necessarily through the region D2 having the smallest sectional area and the following expansion structure 8, and the gas flow velocity increases. The faster the gas flow rate, the lower the gas pressure, and thus, a region B of relatively lower gas pressure, i.e., the expanding structure 8, is formed. By properly designing the diameter of D2 and the size of angle F, the air pressure P2 in region B can be controlled. The value of P2 should be designed to be less than the air pressure P3 in the expansion chamber. This allows the gas of the expansion chamber to flow also to zone B. The area B is designed so that the air pressure of the space communicated with the other end of the low pressure channel 3 at the inlet of the low pressure channel 3 is the inflation air pressure P1 of the circuit breaker. Since the gas pressure P3 in the expansion chamber and the gas pressure P2 in the region B are both the gas pressures of the gas heated by the arc, the values thereof are both larger than the charging gas pressure P1 of the circuit breaker. Thus, the gas in the expansion chamber flows to the region B, and the gas in the high-pressure passage 4 is blocked from flowing to the arc region. At the same time, the gas pressure of these gases is greater than the gas pressure of the gas charge in the housing chamber of the circuit breaker, and they can flow into the housing space of the circuit breaker through the low-pressure channel 3, without causing fouling and blocking of the gas flow.
The embodiment provides an airflow control structure, and the specific working principle of the structure is as follows:
through the structural design of the embodiment, the gas in the arc area can flow to the high-pressure channel 4 through the main channel 1 so as to enter the supercharging area; after the arc is extinguished, the gas in the pressurizing space is accelerated in the main passage 1 after passing through the high-pressure passage 4, and the pressure is reduced, so that the gas in the expansion chamber flows into the main passage 1, and the gas from the pressurizing area is prevented from flowing into the arc area. In this way, a unidirectional flow of gas from the arc region to the plenum region is achieved.
As shown in fig. 3 and 4, the simulation calculation of the air flow field also confirms the realism of the effect achieved by the above structure. In fig. 3, the gas flow in the arc zone is to the booster zone, it being seen that a small portion of the gas is discharged from the low pressure channel 3 and a large portion of the gas enters the booster zone; in fig. 4, the gas flows from the plenum area to the arc area, it being seen that the gas from the plenum area meets the gas from the arc area at the inlet of the low pressure channel 3, i.e. at the expansion structure 8, i.e. the low pressure area B, and thus finally discharges into the housing chamber of the circuit breaker.
The key point of the airflow control structure provided by the embodiment is that, first, the airflow control structure has a structure for accelerating the air so as to decompress the air; second, have the channel which communicates the low-pressure area; thirdly, the passageway that connects the atmospheric pressure region is located the centre in electric arc region and air current acceleration region, and the simple structure of this embodiment through reasonable passageway shape design, cooperates the position design of exhaust passage, has realized the unidirectional flow of gas.
Based on the above structural design, the airflow control structure provided in this embodiment has the following advantages:
the airflow control structure adopts a main channel communicated with an arc area and a high-pressure channel communicated with a pressurizing area of an expansion chamber, and an expansion structure communicated with a shell cavity of a circuit breaker is arranged in the main channel; by adopting the design, the gas in the arc area can flow to the high-pressure channel through the main channel so as to enter the pressurizing area; after the electric arc is extinguished, the gas in the pressurizing area is accelerated in the main channel after passing through the high-pressure channel, the pressure is reduced, so that the gas in the expansion chamber flows into the main channel to prevent the gas from the pressurizing area from flowing into the electric arc area; therefore, the unidirectional flow of the gas from the arc area to the pressurizing area is realized, and the phenomenon that fracture breakdown occurs due to the backflow of the gas after the arc is extinguished is prevented; the structure is simple in principle, can solve the problem of high-temperature gas flow direction fracture in the power frequency stage, and has good popularization and application values.
The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present invention, and the scope of the claimed invention is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. An air flow control structure characterized by comprising a main channel (1) communicated with an arc area and a high-pressure channel (4) communicated with a pressurizing area of an expansion chamber; a gradual change structure is formed in the main channel (1); the expansion section of the gradual change structure forms an expansion structure (8) communicated with a shell cavity of the circuit breaker, and the contraction section is communicated with the high-voltage channel (4); the gas from the arc zone and the gas from the pressurized zone can meet in the expanding structure (8).
2. An airflow control structure according to claim 1, characterized in that the housing chamber of the circuit breaker communicates with the expansion structure (8) through a low-pressure channel (3).
3. A gas flow control structure according to claim 1, characterized in that the main channel (1) comprises an inlet end, a tapering structure and an outlet end, which are in turn connected, wherein the inlet end is in communication with the arc zone; the outlet end is in communication with the high pressure channel (4).
4. A gas flow control structure according to claim 3, wherein the cross-sectional area b of the inlet end 1 Is larger than the sectional area b of the gradual change structure 2 。
5. An airflow control structure according to claim 4 wherein said inlet end has a cross-sectional area b 1 Cross-sectional area b of the graded structure 2 The following conditions are also satisfied:
b 2 ≥1/2b 1 。
6. a gas flow control structure according to claim 3, wherein the cross-sectional area b of the outlet end 3 Is larger than the sectional area b of the gradual change structure 2 。
7. A gas flow control structure according to claim 3, characterized in that the angle F formed by the first contour surface (6) on the convergent section and the central axis of the main channel (1) and the angle E formed by the second contour surface (7) on the divergent section and the central axis of the main channel (1) are acute angles, and the angle F is larger than the angle E.
8. An air flow control structure according to claim 7, characterized in that the main channel (1) is formed by the surrounding of the part (2); the outlet end of the main channel (1) is provided with a flow dividing piece (9); the flow dividing piece (9) is connected to the side wall (5) of the part and is in a cone shape.
9. A method of controlling an air flow, based on the air flow control structure of any one of claims 1-8, comprising:
in the arc combustion phase, the gas from the arc zone flows through the main channel (1) to the high pressure channel (4) to enter the supercharging zone of the expansion chamber;
during the arc extinction phase, the gas coming from the pressurized zone is accelerated through the high-pressure channel (4) via the gradual structure in the main channel (1), meets the gas coming from the arc zone in the expansion structure (8), and finally flows to the housing chamber of the circuit breaker.
10. A self-powered arc extinguishing device comprising an arc extinguishing device body and an airflow control structure according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310913480.XA CN116825572A (en) | 2023-07-24 | 2023-07-24 | Airflow control structure, self-energy arc extinguishing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310913480.XA CN116825572A (en) | 2023-07-24 | 2023-07-24 | Airflow control structure, self-energy arc extinguishing device and method |
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| Publication Number | Publication Date |
|---|---|
| CN116825572A true CN116825572A (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310913480.XA Pending CN116825572A (en) | 2023-07-24 | 2023-07-24 | Airflow control structure, self-energy arc extinguishing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116825572A (en) |
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2023
- 2023-07-24 CN CN202310913480.XA patent/CN116825572A/en active Pending
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