CN212411935U - Air current guide structure of arc extinguish chamber - Google Patents
Air current guide structure of arc extinguish chamber Download PDFInfo
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- CN212411935U CN212411935U CN202021426309.4U CN202021426309U CN212411935U CN 212411935 U CN212411935 U CN 212411935U CN 202021426309 U CN202021426309 U CN 202021426309U CN 212411935 U CN212411935 U CN 212411935U
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Abstract
The utility model relates to an arc extinguish chamber airflow guide structure, which comprises a moving contact, an insulating nozzle and an auxiliary nozzle; the auxiliary nozzle is sleeved on the moving contact, the insulating nozzle is circumferentially arranged on the outer side of the auxiliary nozzle, a nozzle of the auxiliary nozzle is coaxially arranged with the insulating nozzle, and a gas channel is formed by a gap between the side wall of the auxiliary nozzle and the insulating nozzle; the auxiliary nozzle is uniformly provided with a plurality of airflow guide structures along the circumferential direction, and the central line of each airflow guide structure does not pass through the axis of the nozzle of the auxiliary nozzle along the extension line of the fluid direction, so that arc extinguishing gas forms cyclone through the airflow guide structures in the gas channel. Through set up the air current guide structure on auxiliary nozzle, form the whirl passageway, can produce the whirl effect when making the gaseous process whirl passageway of arc extinguishing, increase the gaseous circulation speed of whirl speed and arc extinguishing, restrained the formation in the regional speed stagnation district of electric arc, helped improving the regional arc extinguishing medium recovery strength of electric arc, improved the heat dissipation arc extinguishing effect of blowing.
Description
Technical Field
The utility model relates to a circuit breaker field specifically is an explosion chamber air current guide structure.
Background
SF6As an excellent insulating and arc-extinguishing medium, it is widely used in electrical equipment. However, SF6Has global warming potential of CO223500 times of the green house effect gas, it is a strong greenhouse effect gas, and should be gradually reduced until the use is stopped. C4F7N has a global warming potential of 2100, and C5F10O has a global warming potential of less than 1. With C4F7N and C5F10The novel environmental protection gas represented by O mixture has attracted wide attention in recent years and becomes SF with great potential6Replacing the gas.
C of higher purity4F7N and C5F10The insulation strength of O is SF6More than 2 times of the total weight of the composition. However, since the liquefaction temperature of the fluoronitrile and fluoroketone gases is low, the fluoronitrile and fluoroketone gases must be mixed with a large amount of buffer gas with low liquefaction temperature, such as CO2、N2Air, O2And (4) mixing. In high-voltage electrical apparatus C4F7The N component generally does not exceed 10%. Due to CO2、N2The insulating strength of air is SF61/3, arc extinguishing performance is poor, due toThis inevitably results in the dielectric strength and arc extinguishing performance of the mixed gas being lower than SF6。
Existing SF6The structure of the arc extinguish chamber of the circuit breaker can not be suitable for novel environment-friendly gases such as fluoronitrile, fluoroketone mixed gas and the like, and the mixed gas circuit breaker has the problems of low breaking capacity and poor arc extinguishing effect.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides an explosion chamber air current guide structure, simple structure, it is with low costs, arc extinguishing gas state is good, and air velocity is fast, and the air-blast radiating effect is good, and the arc extinguishing effect is obvious.
The utility model discloses a realize through following technical scheme:
an arc extinguish chamber airflow guide structure comprises a moving contact, an insulating nozzle and an auxiliary nozzle; the auxiliary nozzle is sleeved on the moving contact, the insulating nozzle is circumferentially arranged on the outer side of the auxiliary nozzle, a nozzle of the auxiliary nozzle is coaxially arranged with the insulating nozzle, and a gas channel is formed by a gap between the side wall of the auxiliary nozzle and the insulating nozzle;
the arc extinguishing gas generator is characterized in that a plurality of airflow guide structures are uniformly arranged on the auxiliary nozzle in the circumferential direction, and the center line of each airflow guide structure does not pass through the axis of the nozzle of the auxiliary nozzle along the extension line of the fluid direction and is used for forming cyclone when arc extinguishing gas passes through the airflow guide structures in the gas channel.
Preferably, the included angle between the extension line of the central line of the airflow guide structure along the fluid direction and the axis of the auxiliary nozzle is more than 0 degree and less than or equal to 45 degrees.
Preferably, the airflow guide structure is at least one of a guide inclined hole, a guide inclined groove and a guide inclined plate.
Furthermore, when the airflow guide structure adopts a plurality of combinations of the guide inclined holes, the guide inclined grooves and the guide inclined plates, the combined airflow guide structures are sequentially arranged at intervals and are uniformly and circumferentially arranged.
Furthermore, a plurality of air holes are uniformly formed in the auxiliary nozzle in the circumferential direction, and an air flow guide structure is arranged between every two adjacent air holes.
Furthermore, the air holes are all arranged in a guide inclined hole structure.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides an arc extinguishing chamber airflow guide structure, which forms a rotational flow channel by arranging the airflow guide structure on an auxiliary nozzle, so that arc extinguishing gas can generate a rotational flow effect when passing through the rotational flow channel, and increases the rotational flow speed and the flow speed of the arc extinguishing gas, so that hot gas generated in an electric arc area in a heavy current stage enters an expansion chamber through the rotation of the rotational flow channel, thereby accelerating the mixing process of the hot gas and the original cold gas in the expansion chamber, reducing the gas temperature of the expansion chamber, and avoiding the arc extinguishing gas from deteriorating due to overhigh temperature; the arc extinguishing gas stored in the expansion chamber flows out through the rotation of the rotational flow channel at the current zero-crossing stage, so that the air flow speed is improved, the turbulence is strengthened, the formation of a speed stagnation area in an arc area is inhibited, the recovery strength of an arc extinguishing medium in the arc area is improved, and the arc extinguishing effect of air-blowing heat dissipation is improved.
Furthermore, through one or arbitrary combination between direction inclined hole, direction chute and the direction swash plate, form the airflow guide structure of multiform, strengthened airflow guide structure's suitability, increased the gaseous whirl passageway of arc extinguishing, improved the gaseous whirl speed of arc extinguishing.
Drawings
FIG. 1 is a schematic diagram of the arrangement of the guiding inclined holes of the arc extinguish chamber airflow guiding structure of the utility model;
FIG. 2 is a schematic view of the arrangement of the guiding chute of the arc extinguish chamber airflow guiding structure of the present invention;
fig. 3 is a schematic diagram of the arrangement of the guide inclined plate of the arc extinguish chamber airflow guide structure of the utility model;
FIG. 4 is a side view of the arrangement of the inclined guide plate of the arc extinguish chamber gas flow guide structure of the utility model;
fig. 5 is a sectional view of a guide inclined plate of an arc extinguish chamber airflow guide structure according to an embodiment of the invention;
in the figure: 1 is a static contact; 2 is a moving contact; 3 is an insulating nozzle; 4 is an auxiliary nozzle; 5 is an expansion chamber; 6 is a gas compression chamber; 7 is a piston; 8 is a valve; 9 is an air hole; 10 is a guide inclined plate; 11 is an arc region; 12 is a gas channel; 13 is a guide inclined hole; and 14 is a guide chute.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are provided for purposes of illustration and not limitation.
The utility model provides an arc extinguish chamber airflow guide structure, which comprises a moving contact 2, an insulating nozzle 3 and an auxiliary nozzle 4; the auxiliary nozzle 4 is sleeved on the moving contact 2, and the insulating nozzle 3 is circumferentially arranged outside the auxiliary nozzle 4; the nozzle of the auxiliary nozzle 4 is coaxially arranged with the insulating nozzle 3, and a gas channel 12 is formed by a gap between the side wall of the auxiliary nozzle 4 and the insulating nozzle 3;
the auxiliary nozzle 4 is uniformly provided with a plurality of airflow guide structures along the circumferential direction, and the central line of the airflow guide structures does not pass through the axis of the nozzle of the auxiliary nozzle 4 along the extension line of the fluid direction, so that arc extinguishing gas forms cyclone through the airflow guide structures in the gas channel 12.
A rotational flow channel is formed by the airflow guide structure, so that arc extinguishing gas can generate a rotational flow effect when passing through the rotational flow channel in the air hole channel 12, the rotational flow speed and the flow speed of the arc extinguishing gas are increased, hot gas generated in an electric arc area at a large current stage enters the expansion chamber through the air hole in a rotating manner, the mixing process of the hot gas and original cold state gas in the expansion chamber is accelerated, the gas temperature of the expansion chamber is reduced, and the arc extinguishing performance deterioration caused by overhigh temperature of the arc extinguishing gas is avoided; the arc extinguishing gas stored in the expansion chamber flows out through the rotation of the airflow guide structure at the current zero-crossing stage, so that the airflow speed is improved, the turbulence is strengthened, the formation of a speed stagnation area in an arc area is inhibited, the recovery strength of an arc extinguishing medium in the arc area is improved, and the arc extinguishing effect of air-blowing heat dissipation is improved.
Example 1
As shown in fig. 1, the utility model provides an arc extinguish chamber airflow guiding structure, which comprises a moving contact 2, an insulating nozzle 3 and an auxiliary nozzle 4; the auxiliary nozzle 4 is sleeved on the moving contact 2, and the insulating nozzle 3 is circumferentially arranged outside the auxiliary nozzle 4; the nozzle of the auxiliary nozzle 4 is coaxially arranged with the insulating nozzle 3, and a gas channel 12 is formed by a gap between the side wall of the auxiliary nozzle 4 and the insulating nozzle 3;
a plurality of inclined guide holes 13 are uniformly formed in the circumferential direction of the auxiliary nozzle 4, the inclined guide holes 13 penetrate through the side wall of the auxiliary nozzle 4 and are communicated with the nozzle end face of the auxiliary nozzle 4, and the inclined guide holes 13 are obliquely formed in the same direction relative to the axis of the auxiliary nozzle 4. The inclined guide hole 13 is obliquely arranged, and the included angle between the inclined guide hole and the axis of the auxiliary nozzle 4 is greater than 0 degrees and less than or equal to 45 degrees. The guide inclined hole 13 comprises a small hole end and a large hole end, and the large hole end is arranged on the outer side surface of the auxiliary nozzle 4; the small hole end is arranged on the nozzle end surface of the auxiliary nozzle 4. The switching gas forms a cyclone in the gas channel 12 through the guide ramp 13.
The guide inclined holes 13 which are staggered and inclined are formed in the auxiliary nozzle, and the guide inclined holes 13 form a rotational flow channel, so that arc extinguishing gas can generate a rotational flow effect when passing through the rotational flow channel formed by the guide inclined holes 13, the rotational flow speed and the flow speed of the arc extinguishing gas are increased, hot gas generated in an electric arc area in a large-current stage can enter the expansion chamber through the rotation of the guide inclined holes 13, the mixing process of the hot gas and cold gas in the expansion chamber is accelerated, the gas temperature of the expansion chamber is reduced, and the phenomenon that the arc extinguishing gas is poor in arc extinguishing performance due to overhigh temperature is avoided; the arc extinguishing gas stored in the expansion chamber rotates and flows out through the guide inclined hole 13 at the current zero-crossing stage, so that the gas flow speed is improved, the turbulence is strengthened, the formation of a speed stagnation area in an arc area is inhibited, the recovery strength of an arc extinguishing medium in the arc area is improved, and the arc extinguishing effect of gas blowing heat dissipation is improved.
Preferably, a guide chute 14 is provided between two adjacent guide chutes 13, the guide chute 14 is fixed to the outer side surface of the auxiliary nozzle 4, and the guide chute 14 is inclined in the same direction as the guide chute 13 with respect to the axis of the auxiliary nozzle 4. A swirl channel is formed by the guide chute 14 which is obliquely arranged, so that the swirl channel of arc-extinguishing gas is increased, and the swirl speed of the arc-extinguishing gas is increased.
Preferably, a guide inclined plate 10 is provided between two adjacent guide inclined holes 13, the guide inclined plate 10 is fixed to the outer side surface of the auxiliary nozzle 4, and the guide inclined plate 10 is inclined in the same direction as the guide inclined holes 13 with respect to the axis of the auxiliary nozzle 4. The swirl height is improved by arranging the guide sloping plates 10, the adjacent guide sloping plates 10 form swirl channels, and the swirl effect of arc extinguishing gas is increased through the swirl channels.
Preferably, a guide inclined plate 10 and a guide chute 14 are arranged between two adjacent guide inclined holes 13, the guide inclined plate 10 and the guide chute 14 are fixedly arranged on the outer side surface of the auxiliary nozzle 4, the guide inclined plate 10 and the guide chute 14 are both obliquely arranged in the same direction relative to the axis of the auxiliary nozzle 4, and the guide inclined plate 10 and the guide chute 14 are both obliquely inclined in the same direction as the guide inclined holes 13.
Example 2
As shown in fig. 2, a plurality of guide chutes 14 are uniformly arranged on the auxiliary nozzle 4 in the circumferential direction, a plurality of air holes 9 are arranged on the auxiliary nozzle 4 in the circumferential direction, and the guide chutes 14 are arranged between two adjacent air holes 9; the guide chute 14 is provided on the outer side surface of the auxiliary nozzle 4, and the guide chute 14 is provided obliquely in the same direction with respect to the axis of the auxiliary nozzle 4. The swirl channel formed by the guide chute 14 arranged in the staggered and inclined mode increases the swirl speed of arc extinguishing gas through the swirl channel, so that the arc extinguishing gas can generate a swirl effect when passing through the guide chute 14, and the swirl speed is increased.
Example 3
As shown in fig. 5, the arc extinguish chamber airflow guiding structure comprises a fixed contact 1, a movable contact 2, an insulating nozzle 3, an auxiliary nozzle 4, an expansion chamber 5, a pressure air chamber 6, a piston 7 connected with the wall surface of the pressure air chamber, a valve 8 positioned between the expansion chamber 5 and the pressure air chamber 6, and a plurality of inclined guiding plates 10.
An arc area 11 is formed between the static contact 1 and the moving contact 2, the auxiliary nozzle 4 is sleeved on the moving contact 2, the insulating nozzle 3 is circumferentially arranged on the outer side of the auxiliary nozzle 4, a gas channel 12 is formed between the auxiliary nozzle 4 and the insulating nozzle 3, and the gas channel 12 is communicated with the expansion chamber 5 and the arc area 11. The piston 7 is arranged on the side wall of the moving contact 2 to form a gas compression chamber 6, and arc extinguishing gas compressing the gas compression chamber 6 enters the gas channel 12 through the expansion chamber 5. A valve 8 is arranged at the gas outlet of the air compression chamber 6.
As shown in fig. 3 and 4, the plurality of swash plate guides 10 are uniformly arranged in the circumferential direction in the gas passage 12 on the outer surface of the pilot nozzle 4, and the plurality of swash plate guides 10 are inclined in the same direction with respect to the axis of the pilot nozzle 4. The inclined guide plate 10 is in contact with the inner side surface of the insulating nozzle 3.
An air hole 9 is arranged between two adjacent guide inclined plates 10, and the air hole 9 penetrates through the side wall of the auxiliary nozzle 4 to communicate the arc area 11 and the gas channel 12. The air hole 9 comprises a small hole end and a large hole end, and the large hole end is arranged at the outer side of the auxiliary nozzle 4; the orifice end is disposed inside the auxiliary nozzle 4. The flow velocity of arc extinguishing gas at the outlet is increased by arranging the small hole end and the large hole end air holes 9, and the air blowing heat dissipation effect is improved. The nozzle of the auxiliary nozzle 4 is provided with an inwardly contracted slope guide part, and the air hole 9 passes through the slope guide part to communicate with the arc region 11.
The air flow guide structure in the form of the plurality of guide inclined plates 10 is distributed in the curved air flow channel, a rotational flow channel is formed between the two guide inclined plates 10, and the air flow is changed in direction after flowing through the guide inclined plates 10 to form a rotational component. The surface of the inclined guide plate 10 for drainage and the symmetry axis of the auxiliary nozzle 4 form a certain included angle, and the included angle ranges from 0 degree to 45 degrees.
During the heavy current period, the high-temperature and high-pressure hot gas in the arc area 11 is guided by the guide inclined plate 10, and enters the expansion chamber 5 through the rotation of the rotational flow channel to push the valve 8 to close; during the zero-crossing of the current, the high-pressure gas stored in the expansion chamber 5 is guided by the swirl flow path formed by the guide swash plate 10, and the swirl flow is directed to the arc region 11.
By arranging the inclined guide plates 10 in the gas channel 12 between the arc region 11 and the expansion chamber 5 and forming the arc extinguishing gas flow into a rotational component through the rotational flow channel formed by the adjacent inclined guide plates 10, the hot gas can be accelerated to rotate to enter the expansion chamber in the high-current short-circuit stage, and the gas stored in the expansion chamber can rotate to flow out in the zero-crossing period of the short-circuit current, so that the medium recovery strength of the arc region can be improved.
Preferably, the airflow guiding structure is a plurality of inclined guiding plates 10, the inclined guiding plates 10 are circumferentially arranged on the outer side surface of the auxiliary nozzle 4 in the gas channel 12, and the inclined guiding plates 10 are obliquely arranged in the same direction relative to the axis of the auxiliary nozzle 4; a guide chute 14 is arranged between two adjacent guide inclined plates 10, and the guide chute 14 is parallel to the axis of the guide inclined plate 10.
Preferably, a guide chute 14 is provided between the adjacent guide inclined plate 10 and the air hole 9, the guide chute 14 is provided on the outer side surface of the auxiliary nozzle 4, and the guide chute 14 is parallel to the guide inclined plate 10. And a rotational flow channel of arc extinguishing gas is increased, and the rotational flow speed of the arc extinguishing gas is increased.
At present, the research focus of replacing gas in the field of high-voltage switches is C4F7N、C5F10O is a fluoronitrile or fluoroketone gas having a much lower greenhouse effect than SF6Insulation strength up to SF6More than 2 times of the total weight of the composition. However, the liquefaction temperature is high, two gases can not be used due to liquefaction phenomenon at standard environmental temperature and one atmospheric pressure, and C4F7The liquefaction temperature of N is about-4.7 ℃ at 0.1MPa, and C5F10O is 26.9 ℃, and a small amount of C is necessary4F7N or C5F10O plus a large amount of buffer gas, at least one gas with a low liquefaction temperature and generally low dielectric strength, is used as a mixed gas.
The gas channel 12 between the arc area 11 and the expansion chamber 5 is provided with the gas flow guide structure for promoting the gas flow to rotate, and the gas flow guide structure forms a rotational flow channel, so that hot gas in the arc area at a large current stage can rotate to enter the expansion chamber, the mixing process with original cold gas in the expansion chamber is accelerated, the gas temperature of the expansion chamber is reduced, and the phenomenon that the arc extinguishing performance is poor due to overhigh temperature of arc extinguishing gas is avoided; the gas stored in the expansion chamber flows out in a rotating mode in the current zero-crossing stage, the formation of a speed stagnation area in an arc area is restrained, the air flow speed is improved, turbulence is enhanced, the air blowing heat dissipation effect is good, and the medium recovery strength of the arc area after the current crosses zero is improved.
The gas flow guiding structure is formed by combining one or more of the inclined guiding plates 10, the inclined guiding holes 13 and/or the inclined guiding slots 14 or combining the inclined guiding plates with the gas holes 9 to form a rotational flow channel, so that arc extinguishing gas can generate a rotational flow effect when passing through the rotational flow channel, and the gas holes 9 are arranged in the inclined guiding holes 13.
The utility model discloses can be applied to with SF6Or novel environment-friendly gasSuch as fluoronitrile and fluoroketone mixed gas as arc extinguishing medium, to improve the breaking capability.
Claims (6)
1. An arc extinguish chamber airflow guide structure is characterized by comprising a moving contact (2), an insulating nozzle (3) and an auxiliary nozzle (4); the auxiliary nozzle (4) is sleeved on the movable contact (2), the insulating nozzle (3) is circumferentially arranged on the outer side of the auxiliary nozzle (4), a nozzle of the auxiliary nozzle (4) is coaxially arranged with the insulating nozzle (3), and a gas channel (12) is formed in a gap between the side wall of the auxiliary nozzle (4) and the insulating nozzle (3);
the arc extinguishing gas generator is characterized in that a plurality of airflow guide structures are uniformly arranged on the auxiliary nozzle (4) in the circumferential direction, the center line of each airflow guide structure does not pass through the axis of the nozzle of the auxiliary nozzle (4) along the extension line of the fluid direction, and the arc extinguishing gas is used for forming cyclone through the airflow guide structures in the gas channel (12).
2. An arc extinguishing chamber gas flow guiding structure according to claim 1, characterized in that the angle between the extension of the center line of the gas flow guiding structure in the fluid direction and the axis of the auxiliary nozzle (4) is greater than 0 ° and less than or equal to 45 °.
3. An arc chute gas flow guiding structure according to claim 1, characterized in that the gas flow guiding structure is at least one of a guide inclined hole (13), a guide inclined groove (14) and a guide inclined plate (10).
4. The arc extinguish chamber gas flow guide structure according to claim 3, wherein when the gas flow guide structure adopts a combination of a plurality of guide inclined holes (13), guide inclined grooves (14) and guide inclined plates (10), the combined gas flow guide structures are sequentially arranged at intervals and are uniformly and circumferentially arranged.
5. An arc extinguishing chamber gas flow guiding structure according to claim 3, characterized in that a plurality of air holes (9) are uniformly arranged on the auxiliary nozzle (4) in the circumferential direction, and the gas flow guiding structure is arranged between two adjacent air holes (9).
6. An arc extinguishing chamber gas flow guiding structure according to claim 5, characterized in that the gas holes (9) are all arranged in a guiding inclined hole (13) structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021426309.4U CN212411935U (en) | 2020-07-17 | 2020-07-17 | Air current guide structure of arc extinguish chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021426309.4U CN212411935U (en) | 2020-07-17 | 2020-07-17 | Air current guide structure of arc extinguish chamber |
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| CN212411935U true CN212411935U (en) | 2021-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114420517A (en) * | 2022-03-31 | 2022-04-29 | 晟望电气有限公司 | Sulfur hexafluoride gas insulation switch |
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2020
- 2020-07-17 CN CN202021426309.4U patent/CN212411935U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114420517A (en) * | 2022-03-31 | 2022-04-29 | 晟望电气有限公司 | Sulfur hexafluoride gas insulation switch |
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