Circuit breaker and arc extinguish chamber thereof
阅读说明:本技术 断路器及其灭弧室 (Circuit breaker and arc extinguish chamber thereof ) 是由 张豪 张博 王之军 刘亚培 郭煜敬 姚永其 金光耀 王冠 郝相羽 王刚 于 2018-08-15 设计创作,主要内容包括:本发明涉及一种断路器及其灭弧室,灭弧室包括主喷口和与主喷口连通的膨胀室,所述膨胀室内设有储气室,所述储气室的腔壁上设有在膨胀室内压力大于储气室内压力超过设定值后开启以供膨胀室气体进入储气室的进气单向阀结构,储气室的腔壁上还设有在储气室内压力大于膨胀室内压力时开启以供储气室内气体排出至膨胀室的出气单向阀结构;或者所述储气室的腔壁上设有双向压力阀结构,所述双向压力阀结构在膨胀室内压力大于储气室内压力超过设定值后开启以供膨胀室气体进入储气室,所述双向压力阀结构在储气室压力大于膨胀室压力时开启以供储气室内气体排出至膨胀室。(The invention relates to a circuit breaker and an arc extinguish chamber thereof, wherein the arc extinguish chamber comprises a main nozzle and an expansion chamber communicated with the main nozzle, a gas storage chamber is arranged in the expansion chamber, a gas inlet one-way valve structure which is opened after the pressure in the expansion chamber is greater than the pressure in the gas storage chamber and exceeds a set value so that gas in the expansion chamber can enter the gas storage chamber is arranged on the wall of the gas storage chamber, and a gas outlet one-way valve structure which is opened when the pressure in the gas storage chamber is greater than the pressure in the expansion chamber so that the gas in the gas storage chamber can be discharged to the expansion chamber; or the cavity wall of the air storage chamber is provided with a bidirectional pressure valve structure, the bidirectional pressure valve structure is opened when the pressure in the expansion chamber is greater than the pressure in the air storage chamber and exceeds a set value so that the gas in the expansion chamber can enter the air storage chamber, and the bidirectional pressure valve structure is opened when the pressure in the air storage chamber is greater than the pressure in the expansion chamber so that the gas in the air storage chamber can be discharged to the expansion chamber.)
1. The arc extinguishing chamber comprises a main nozzle and an expansion chamber communicated with the main nozzle, and is characterized in that a gas storage chamber is arranged in the expansion chamber, a gas inlet one-way valve structure which is opened after the pressure in the expansion chamber is greater than the pressure in the gas storage chamber and exceeds a set value so that gas in the expansion chamber can enter the gas storage chamber is arranged on the wall of the gas storage chamber, and a gas outlet one-way valve structure which is opened when the pressure in the gas storage chamber is greater than the pressure in the expansion chamber so that the gas in the gas storage chamber can be discharged to the expansion chamber is also arranged on; or the cavity wall of the air storage chamber is provided with a bidirectional pressure valve structure, the bidirectional pressure valve structure is opened when the pressure in the expansion chamber is greater than the pressure in the air storage chamber and exceeds a set value so that the gas in the expansion chamber can enter the air storage chamber, and the bidirectional pressure valve structure is opened when the pressure in the air storage chamber is greater than the pressure in the expansion chamber so that the gas in the air storage chamber can be discharged to the expansion chamber.
2. The arc extinguish chamber according to claim 1, wherein an annular partition plate is arranged in the expansion chamber, the annular partition plate is arranged between the movable main contact and the main nozzle and forms the air storage chamber with the movable main contact and the main nozzle in a surrounding mode, and the air inlet one-way valve structure and the air outlet one-way valve structure are arranged on the annular partition plate.
3. The arc extinguish chamber according to claim 2, wherein the air inlet check valve structure comprises an air inlet hole formed in the annular partition plate and an air inlet hole valve body arranged at the air inlet hole, the air inlet hole valve body comprises an air inlet valve bolt fixed on the annular partition plate, a nut of the air inlet valve bolt is arranged in the air storage chamber, an air inlet valve plate used for blocking the air inlet hole is assembled on the air inlet valve bolt in a sliding mode along the axial direction of the air inlet valve bolt, and a compression spring enabling the valve plate to open the air inlet hole under the set pressure is installed between the air inlet valve plate and the nut of.
4. The arc extinguish chamber according to claim 3, wherein the air outlet one-way valve structure comprises an air outlet hole formed in the annular partition plate and an air outlet hole valve body arranged at the air outlet hole, the air outlet hole valve body comprises an air outlet valve bolt fixed on the annular partition plate, a nut of the air outlet valve bolt is located in the expansion chamber, and an air outlet valve sheet used for blocking the air outlet hole is assembled on the air outlet valve bolt in a sliding mode along the axial direction of the air outlet valve bolt.
5. Arc chute according to any one of claims 1-4, characterized in that one air reservoir is provided.
6. The circuit breaker comprises an arc extinguish chamber, wherein the arc extinguish chamber comprises a main nozzle and an expansion chamber communicated with the main nozzle, and is characterized in that a gas storage chamber is arranged in the expansion chamber, a gas inlet one-way valve structure which is opened when the pressure in the expansion chamber is greater than the pressure in the gas storage chamber and exceeds a set value so that gas in the expansion chamber can enter the gas storage chamber is arranged on the wall of the gas storage chamber, and a gas outlet one-way valve structure which is opened when the pressure in the gas storage chamber is greater than the pressure in the expansion chamber so that the gas in the gas storage chamber can be discharged to the expansion; or the cavity wall of the air storage chamber is provided with a bidirectional pressure valve structure, the bidirectional pressure valve structure is opened when the pressure in the expansion chamber is greater than the pressure in the air storage chamber and exceeds a set value so that the gas in the expansion chamber can enter the air storage chamber, and the bidirectional pressure valve structure is opened when the pressure in the air storage chamber is greater than the pressure in the expansion chamber so that the gas in the air storage chamber can be discharged to the expansion chamber.
7. The circuit breaker as claimed in claim 6, wherein an annular partition is provided in the expansion chamber, the annular partition is provided between the movable main contact and the main nozzle and encloses the air storage chamber with the movable main contact and the main nozzle, and the inlet check valve structure and the outlet check valve structure are provided on the annular partition.
8. The circuit breaker of claim 7, wherein the intake check valve structure comprises an intake hole formed in the annular partition and an intake hole valve body formed at the intake hole, the intake hole valve body comprises an intake valve bolt fixed to the annular partition, a nut of the intake valve bolt is located in the air storage chamber, an intake valve plate for blocking the intake hole is slidably mounted on the intake valve bolt in an axial direction of the intake valve bolt, and a compression spring for allowing the valve plate to open the intake hole at a set pressure is mounted between the intake valve plate and the nut of the intake valve bolt.
9. The circuit breaker as claimed in claim 8, wherein the outlet check valve structure comprises an outlet hole formed in the annular partition plate and an outlet valve body formed at the outlet hole, the outlet valve body comprises an outlet valve bolt fixed to the annular partition plate, a nut of the outlet valve bolt is located in the expansion chamber, and an outlet valve piece for blocking the outlet hole is slidably mounted on the outlet valve bolt in an axial direction of the outlet valve bolt.
10. The circuit breaker according to any of claims 6-9, wherein there is one air reservoir.
Technical Field
The invention relates to a circuit breaker and an arc extinguish chamber thereof.
Background
At high pressure of SF6In the research and development of the arc extinguish chamber of the circuit breaker, the current development trend is to reduce the cost, reduce the operation power and improve the reliability of the operating mechanism, so that the existing arc extinguish chamber, particularly the arc extinguish chamber with the super-voltage and extra-high voltage level is required to be converted from a pneumatic structure to a self-energy structure. The self-energy arc extinguish chamber has the advantages that when a large current is cut off, the gas in the expansion chamber is heated and pressurized under the action of electric arc energy, and strong air blowing is provided at the moment when the electric arc is extinguished, so that the purpose of arc extinction is achieved. Meanwhile, after a certain pressure is built up in the expansion chamber, the valve plate between the expansion chamber and the air compression chamber is closed, the two air chambers are isolated, and lower air pressure is maintained in the air compression chamber, so that the mechanism does not need larger operation power.
Chinese patent with publication number CN201315287Y and publication date 2009.09.23 discloses a dual-chamber thermal expansion self-energy sulfur hexafluoride breaker arc extinguish chamber and a cylinder thereof, as shown in fig. 1, the arc extinguish chamber includes a piston rod 9, a cylinder, and a thermal expansion chamber 6 and a pressure air chamber 8 isolated from each other, the cylinder of the cylinder is composed of a pressure air chamber cylinder 7 with a closed and fixed bottom and a thermal expansion chamber cylinder 5 slidably inserted in the pressure air chamber cylinder 7, and the top of the thermal expansion chamber cylinder 5 is provided with a main nozzle, i.e. the nozzle 1 shown in fig. 1. The bottom of the thermal expansion chamber cylinder 5 is sealed with a partition plate 11, the partition plate 11 is provided with a check valve 12 which is opened and closed according to the thermal expansion airflow pressure generated by electric arc, the upper end of the piston rod 9 is inserted into the thermal expansion chamber cylinder 5 and is fixedly connected with the thermal expansion chamber cylinder 5 through the partition plate 11, the lower end of the piston rod 9 penetrates out of the wire outlet plate 10, the outside of the part of the piston rod 9 inserted into the thermal expansion chamber cylinder 5 is sleeved with a flow guide body 3, the end of the flow guide body 3 is provided with an auxiliary nozzle, namely a small nozzle 2 shown in figure 1, the thermal expansion chamber cylinder 5 is internally provided with a thermal expansion chamber 6 above the partition plate 11, a pressure air chamber 8 is formed below the partition plate in the pressure air chamber cylinder 7. The thermal expansion cylinder 5 and the components in the thermal expansion chamber 6 can slide up and down in the air compression chamber cylinder 7 to compress the gas in the space in the air compression chamber 8. The piston rod only needs to drive the thermal expansion cylinder barrel where the thermal expansion chamber is located to move so as to complete work, and the operation work is reduced.
However, the circuit breaker using the arc chute has the following problems: when the pressure of the expansion chamber is lower, the gas blowing is insufficient at the moment of arc extinction, which is not beneficial to cut-off and medium recovery after the inter-fracture arc; when the pressure of the expansion chamber is too high, shock waves are easily formed inside the nozzle at the moment of arc extinction, and the blowing speed of the area behind the shock waves is low, so that the opening and the closing are still not facilitated. In addition, when the low current is cut off, because only the gas in the air compression chamber is compressed, the expansion chamber is equivalent to a larger parasitic volume, and the arc energy is smaller under the cut-off working condition, and the larger expansion chamber volume causes that sufficient pressure cannot be established, so that the breaker cannot be ensured to have stronger cut-off performance.
Disclosure of Invention
The invention aims to provide an arc extinguish chamber, which aims to solve the problem that the pressure in an expansion chamber in the prior art cannot meet the pressure required by high-current switching-off and low-current switching-off; the invention also aims to provide a circuit breaker using the arc extinguish chamber.
The technical scheme adopted by the arc extinguish chamber is as follows:
the arc extinguishing chamber comprises a main nozzle and an expansion chamber communicated with the main nozzle, a gas storage chamber is arranged in the expansion chamber, a gas inlet one-way valve structure which is opened after the pressure in the expansion chamber is greater than the pressure in the gas storage chamber and exceeds a set value so that gas in the expansion chamber can enter the gas storage chamber is arranged on the wall of the gas storage chamber, and a gas outlet one-way valve structure which is opened when the pressure in the gas storage chamber is greater than the pressure in the expansion chamber so that the gas in the gas storage chamber can be discharged to the expansion chamber is also arranged on the wall; or the cavity wall of the air storage chamber is provided with a bidirectional pressure valve structure, the bidirectional pressure valve structure is opened when the pressure in the expansion chamber is greater than the pressure in the air storage chamber and exceeds a set value so that the gas in the expansion chamber can enter the air storage chamber, and the bidirectional pressure valve structure is opened when the pressure in the air storage chamber is greater than the pressure in the expansion chamber so that the gas in the air storage chamber can be discharged to the expansion chamber.
The expansion chamber is internally provided with an air storage chamber, and the wall of the air storage chamber is provided with an air inlet one-way valve structure and an air outlet one-way valve structure. When the breaker is switched off with larger current, the pressure in the expansion chamber starts to rise at the initial stage of switching off of the arc extinguish chamber, when the pressure in the expansion chamber is greater than the pressure in the gas storage chamber and exceeds a set value, the gas in the expansion chamber enters the gas storage chamber, the pressure in the expansion chamber is reduced to meet the pressure required by high-current switching off, and when the switching off is close to the end, the pressure in the expansion chamber is rapidly reduced, when the pressure in the expansion chamber is less than the pressure in the gas storage chamber, the gas outlet one-way valve structure is opened, high-pressure gas in the gas storage chamber is discharged, so that certain gas blowing capacity is ensured at the last stage of; when the breaker opens and closes the small current, the pressure of the expansion chamber begins to rise at the opening initial stage of the arc extinguish chamber, the pressure in the expansion chamber is larger than the pressure in the gas storage chamber but not larger than a set value, then the gas inlet one-way valve structure is in a closed state, and under the same condition, because the volume of the expansion chamber is reduced, the pressure in the expansion chamber is relatively large, the pressure for opening and closing the small current can be met, and the opening performance of the breaker is improved. The problem of exist among the prior art because the expansion chamber internal pressure can't satisfy the required pressure of heavy current cut-off and undercurrent cut-off is solved.
The expansion chamber is internally provided with an air storage chamber, and the wall of the air storage chamber is provided with a bidirectional pressure valve structure. The pressure in the expansion chamber begins to rise at the initial stage of opening the switch of the arc extinguish chamber, when the pressure in the expansion chamber is greater than the pressure in the gas storage chamber and exceeds a set value, the expansion chamber is opened to allow gas in the expansion chamber to enter the gas storage chamber, the pressure in the expansion chamber is reduced to meet the pressure required by high-current opening and closing, when the opening is close to the end, the pressure in the expansion chamber is rapidly reduced, when the pressure in the expansion chamber is less than the pressure in the gas storage chamber, the two-way pressure valve structure is opened, high-pressure gas in the gas storage chamber is discharged, the certain gas blowing capacity at; when the breaker opens and closes the small current, the pressure of the expansion chamber begins to rise at the opening initial stage of the arc extinguish chamber, the pressure in the expansion chamber is larger than the pressure in the gas storage chamber but not larger than a set value, then the gas inlet one-way valve structure is in a closed state, and under the same condition, because the volume of the expansion chamber is reduced, the pressure in the expansion chamber is relatively large, the pressure for opening and closing the small current can be met, and the opening performance of the breaker is improved. The problem of exist among the prior art because the expansion chamber internal pressure can't satisfy the required pressure of heavy current cut-off and undercurrent cut-off is solved.
An annular partition plate is arranged in the expansion chamber, the annular partition plate is arranged between the movable main contact and the main nozzle and forms an air storage chamber together with the movable main contact and the main nozzle in an enclosing mode, and the air inlet one-way valve structure and the air outlet one-way valve structure are arranged on the annular partition plate. The annular partition plate is convenient for isolating the air storage chamber in the expansion chamber, and the design and the processing are convenient.
The air inlet check valve structure comprises an air inlet hole formed in the annular partition plate and an air inlet hole valve body arranged at the air inlet hole, the air inlet hole valve body comprises an air inlet valve bolt fixed on the annular partition plate, a nut of the air inlet valve bolt is located in the air storage chamber, an air inlet valve block used for blocking the air inlet hole is assembled on the air inlet valve bolt along the axial sliding of the air inlet valve bolt, and a compression spring enabling the valve block to open the air inlet hole under the set pressure is mounted between the air inlet valve block and the nut of the air inlet valve. The air inlet check valve is simple in structure, and automatic opening and closing of the air inlet valve body are conveniently achieved.
The check valve structure of giving vent to anger is including setting up the venthole on annular baffle and setting up the venthole valve body in venthole department, and the venthole valve body is including fixing the ventvalve bolt on annular baffle, the nut of ventvalve bolt is in the expansion chamber, and the axial slip along the ventvalve bolt on the ventvalve bolt is equipped with the ventvalve piece that is used for the shutoff venthole. The air outlet valve body can ensure that enough gas is stored in the gas storage chamber, so that the gas in the gas storage chamber is utilized to ensure that the arc extinguish chamber has enough blowing capacity at the last stage of switching off.
The gas receiver is equipped with one, not only can satisfy the requirement of opening and shutting of circuit breaker and make things convenient for the design and processing of explosion chamber.
The technical scheme adopted by the circuit breaker is as follows:
the circuit breaker comprises an arc extinguish chamber, the arc extinguish chamber comprises a main nozzle and an expansion chamber communicated with the main nozzle, a gas storage chamber is arranged in the expansion chamber, a gas inlet one-way valve structure which is opened after the pressure in the expansion chamber is greater than the pressure in the gas storage chamber and exceeds a set value so that gas in the expansion chamber can enter the gas storage chamber is arranged on the wall of the gas storage chamber, and a gas outlet one-way valve structure which is opened when the pressure in the gas storage chamber is greater than the pressure in the expansion chamber so that the gas in the gas storage chamber can be discharged to the expansion chamber is also; or the cavity wall of the air storage chamber is provided with a bidirectional pressure valve structure, the bidirectional pressure valve structure is opened when the pressure in the expansion chamber is greater than the pressure in the air storage chamber and exceeds a set value so that the gas in the expansion chamber can enter the air storage chamber, and the bidirectional pressure valve structure is opened when the pressure in the air storage chamber is greater than the pressure in the expansion chamber so that the gas in the air storage chamber can be discharged to the expansion chamber.
An annular partition plate is arranged in the expansion chamber, the annular partition plate is arranged between the movable main contact and the main nozzle and forms an air storage chamber together with the movable main contact and the main nozzle in an enclosing mode, and the air inlet one-way valve structure and the air outlet one-way valve structure are arranged on the annular partition plate.
The air inlet check valve structure comprises an air inlet hole formed in the annular partition plate and an air inlet hole valve body arranged at the air inlet hole, the air inlet hole valve body comprises an air inlet valve bolt fixed on the annular partition plate, a nut of the air inlet valve bolt is located in the air storage chamber, an air inlet valve block used for blocking the air inlet hole is assembled on the air inlet valve bolt along the axial sliding of the air inlet valve bolt, and a compression spring enabling the valve block to open the air inlet hole under the set pressure is mounted between the air inlet valve block and the nut of the air inlet valve.
The check valve structure of giving vent to anger is including setting up the venthole on annular baffle and setting up the venthole valve body in venthole department, and the venthole valve body is including fixing the ventvalve bolt on annular baffle, the nut of ventvalve bolt is in the expansion chamber, and the axial slip along the ventvalve bolt on the ventvalve bolt is equipped with the ventvalve piece that is used for the shutoff venthole.
The air storage chamber is provided with one air storage chamber.
Drawings
FIG. 1 is a schematic diagram of a prior art arc chute;
fig. 2 is a schematic structural diagram of an arc extinguishing chamber before separation of arc contacts in a first embodiment of the circuit breaker according to the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic structural view of an arc extinguishing chamber with separated arcing contacts according to a first embodiment of the circuit breaker of the present invention;
FIG. 5 is a partial enlarged view of the portion B in FIG. 4;
fig. 6 is a schematic structural diagram of an arc extinguishing chamber according to a first embodiment of the circuit breaker of the present invention when an arc is extinguished;
FIG. 7 is an enlarged view of a portion of FIG. 6 at C;
fig. 8 is a schematic structural view of an arc extinguishing chamber with separated arcing contacts according to a second embodiment of the circuit breaker of the present invention;
fig. 9 is a schematic structural view of an arc extinguishing chamber with separated arcing contacts according to a third embodiment of the circuit breaker of the present invention;
in fig. 1: 1-nozzle, 2-small nozzle, 3-flow guide body, 5-thermal expansion chamber cylinder, 6-thermal expansion chamber, 7-air compression chamber cylinder, 8-air compression chamber, 9-piston rod, 10-outlet plate, 11-partition plate, 12-check valve and 13-sealing ring;
in fig. 2 to 9: 100-expansion chamber, 101-air compression chamber, 102-pull rod, 103-moving arc contact, 104-moving main contact, 105-static main contact, 106-static arc contact, 107-check valve, 108-through hole, 109-air inlet hole, 110-air inlet valve plate, 111-air outlet valve plate, 112-air outlet hole, 113-main nozzle, 114-compression spring, 115-air outlet valve bolt, 116-baffle, 117-air compression chamber cylinder, 118-auxiliary nozzle, 119-annular partition plate, 120-air storage chamber, 121-first air hole, 122-second air hole, 123-spring, 124-valve plate, 125-partition plate, 126-communication hole, 127-stop block.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 2 to 7, the first embodiment of the circuit breaker of the present invention includes an arc-extinguishing chamber, the arc-extinguishing chamber includes a
Through the
The intake check valve structure in this embodiment includes an
The structure of the air outlet check valve comprises an
The arc extinguishing process of the arc extinguishing chamber comprises the following steps: under the working condition that the circuit breaker is opened and closed by a large short-circuit current, as shown in fig. 2 and 3, when the arc extinguish chamber is in the initial stage of opening, the
When the breaker is opened and closed under the working condition of a small short-circuit current, the rising amplitude of the pressure in the
The expansion chamber is internally provided with two one-way valve bodies for air inlet and air outlet, a compression spring is arranged between the air inlet valve plate and a nut of an air inlet valve bolt in a propping manner, and the air flow direction is from the expansion chamber to the air storage chamber. When the pressure difference applied to the air inlet valve sheet is smaller than the pretightening force of the compression spring, the air inlet valve sheet is closed, and the expansion chamber is isolated from the air storage chamber; when the pressure difference on the air inlet valve is larger than the pretightening force of the compression spring, the gas enters the gas storage chamber from the expansion chamber, the pressure in the expansion chamber is reduced, and the overhigh internal pressure is avoided. The highest pressure which can be reached by the expansion chamber can be controlled by adjusting the pretightening force of the compression spring on the air inlet valve piece and the area of the air inlet valve piece. The air outlet valve bolt is not provided with a compression spring and is in a free state, and the air flow direction is from the air storage chamber to the expansion chamber. When the pressure of the expansion chamber is greater than that of the air storage chamber, the air outlet valve sheet is closed, and the two air chambers are isolated from each other; when the pressure of the expansion chamber is smaller than that of the gas storage chamber, the gas outlet valve piece is opened, gas in the gas storage chamber flows into the expansion chamber, the pressure of the gas in the gas storage chamber is reduced, certain blowing capacity is still ensured at the last stage of brake opening, and the establishment of medium recovery after arc is facilitated.
The circuit breaker can improve the breaking performance of the existing self-energy arc extinguish chamber with the voltage class of 252kV and below, and provides a technical basis for popularization and application of the self-energy arc extinguish chamber to the circuit breakers with the high voltage classes of 420 kV, 550 kV, 800 kV and 1100 kV. The on-off reliability of the self-energy arc extinguish chamber is improved, and the self-energy arc extinguish chamber is popularized and applied to high-voltage-level circuit breakers, so that the research and development cost can be reduced, the product quality is improved, and the economic benefit and the social benefit of a company are greatly improved.
The second embodiment of the circuit breaker of the present invention is different from the first embodiment of the circuit breaker of the present invention only in that: as shown in fig. 8, the inlet valve body is composed of an
The third embodiment of the circuit breaker of the present invention is different from the first embodiment of the circuit breaker of the present invention only in that: as shown in fig. 9, the
When the breaker breaks a small short-circuit current, as the opening process continues, although the pressure in the
In the specific embodiment of the arc extinguish chamber of the present invention, the arc extinguish chamber in the embodiment has the same structure as that of any one of the first to third specific embodiments of the circuit breaker, and details are not repeated.
- 上一篇:一种医用注射器针头装配设备
- 下一篇:一种用于智能配电网的快速开关