阅读说明：本技术 一种高速开断断路器灭弧室 (Arc extinguish chamber of high-speed cut-off circuit breaker ) 是由 刘时 林莘 宋宇 庚振新 张佳 徐建源 张博 邢恩阳 宋佳霖 张帆 于 2021-09-02 设计创作，主要内容包括：本发明提供一种高速开断断路器灭弧室,涉及高压开关设备技术领域。本装置包括外绝缘瓷套、动端部件、静端部件、上接线板、下接线板、阀座,所述动端部件包括动端拉杆、动主触头、压气缸、灭弧喷口、辅助喷口、喷口底座以及动弧触头；所述静端部件包括静弧触头、静主触头、动端屏蔽罩以及静端屏蔽罩。静弧触头刚接在灭弧室内部,压气缸同轴固定在动端拉杆上,压气缸连接灭弧喷口,辅助喷口、动弧触头以及大喷口固定连接,动弧触头另一端与阀座和拉杆相连。动弧触头拉杆处设有活塞,活塞外壁与灭弧喷口内壁轮廓相匹配且留有间隙。当动弧触头运动时,电弧产生的高压气体经导气通道流入活塞与灭弧喷口形成的封闭区域做为用来熄弧的气室。(The invention provides an arc extinguish chamber of a high-speed cut-off circuit breaker, and relates to the technical field of high-voltage switch equipment. The device comprises an external insulating porcelain bushing, a movable end part, a static end part, an upper wiring board, a lower wiring board and a valve seat, wherein the movable end part comprises a movable end pull rod, a movable main contact, a pressure cylinder, an arc extinguishing nozzle, an auxiliary nozzle, a nozzle base and a movable arc contact; the static end part comprises a static arc contact, a static main contact, a dynamic end shield cover and a static end shield cover. The static arc contact is rigidly connected inside the arc extinguish chamber, the air cylinder is coaxially fixed on the pull rod at the movable end, the air cylinder is connected with the arc extinguish nozzle, the auxiliary nozzle, the movable arc contact and the large nozzle are fixedly connected, and the other end of the movable arc contact is connected with the valve seat and the pull rod. And a piston is arranged at the moving arc contact pull rod, and the outer wall of the piston is matched with the contour of the inner wall of the arc extinguishing nozzle and a gap is reserved between the outer wall of the piston and the inner wall of the arc extinguishing nozzle. When the moving arc contact moves, high-pressure gas generated by electric arc flows into a closed area formed by the piston and the arc extinguishing nozzle through the gas guide channel to be used as a gas chamber for arc extinguishing.)

1. An arc extinguish chamber of a high-speed cut-off circuit breaker is characterized by comprising an external insulating porcelain bushing, a movable end part, a static end part, an upper wiring board, a lower wiring board and a valve seat;

the movable end part comprises a movable end pull rod, a movable main contact, a pressure cylinder, an arc extinguishing nozzle, an auxiliary nozzle, a nozzle base and a movable arc contact; the pneumatic cylinder is coaxially fixed on the movable end pull rod, the pneumatic cylinder is respectively connected with the arc extinguishing nozzle, the auxiliary nozzle and the movable arc contact and is fixedly connected with the arc extinguishing nozzle, the other end of the movable arc contact is respectively fixedly connected with the valve seat and the movable end pull rod, and the pneumatic cylinder is arranged at one end of the valve seat; the movable arc contact is coaxially arranged in the auxiliary nozzle, the auxiliary nozzle is coaxially arranged in the air cylinder, the arc extinguishing nozzle is coaxially arranged in the nozzle base, the nozzle base is axially connected with the valve seat, the movable main contact is coaxially fixed on the outer side of the valve seat, and the movable main contact is connected with the movable end support;

the static end part comprises a static arc contact, a static main contact, a dynamic end shield cover and a static end shield cover; the static arc contact is rigidly connected to the upper wiring board, a one-way piston is arranged at the position of the moving arc contact pull rod, and the outer wall of the one-way piston is matched with the contour of the inner wall of the downstream area of the arc extinguishing nozzle and a gap is reserved between the outer wall of the one-way piston and the inner wall of the downstream area of the arc extinguishing nozzle; the axial circumference of the arc extinguishing nozzle is wrapped by a static arc contact, the static arc contact is in axial contact with a moving arc contact, a piston support is coaxially supported between a one-way piston and a lower wiring board, the outer diameter of the one-way piston is coaxially fixed at one end of a moving main contact, a through hole is formed in the axis of the lower wiring board, and a moving end pull rod extends out of the through hole of the lower wiring board.

2. The arc extinguish chamber of the high-speed cut-off circuit breaker according to claim 1, wherein the movable end part and the static end part are coaxially arranged in the movable end shield cover and the static end shield cover, the outer insulating porcelain bushing is coaxially arranged outside the movable end shield cover and the static end shield cover, one end of the outer insulating porcelain bushing is connected with one side of the movable end pull rod and is sealed by the lower wiring board, a through hole is formed in the axis of the lower wiring board, the movable end pull rod extends out of the through hole of the lower wiring board, and the other side of the outer insulating porcelain bushing is sealed by the upper wiring board.

3. The arc extinguish chamber of the high-speed cut-off circuit breaker according to claim 1, wherein one end of the interior of the puffer cylinder is provided with a one-way piston, the movable end pull rod is coaxially arranged in the middle of the one-way piston, the movable end pull rod is of a hollow structure, the thin wall of the movable end pull rod is provided with an exhaust hole, the radius of the exhaust hole is matched with that of the puffer cylinder, and the axis of the movable end pull rod is provided with a gas blocking plug.

4. The arc chute of a high speed circuit breaker according to claim 1, wherein the stationary arcing contact is coaxially disposed opposite the moving arcing contact, and the moving main contact is coaxially disposed opposite the stationary main contact.

Technical Field

The invention relates to the technical field of high-voltage switch equipment, in particular to an arc extinguish chamber of a high-speed cut-off circuit breaker.

Background

In recent years, with the continuous development of the power industry, the number of sensitive power elements in a power grid line is increasing, and simultaneously, higher requirements on the quality of electric energy are also put forward. The fault of the high-voltage circuit breaker on/off line is one of the main factors causing voltage change and destroying the power quality of the power grid. The traditional high-voltage circuit breaker is difficult to meet the requirement of a power grid on reduction of line disturbance due to long on-off time. The longer the short-circuit fault current lasts, the more serious the impact on the power grid and the damage degree of equipment are, and the loss caused by prolonging the power failure time of a plurality of sensitive loads by 1ms reaches millions, even threatens the life and property safety of people. Therefore, how to cut off the short-circuit current as soon as possible and reduce the disturbance of the short-circuit current to the line become important for the research of the high-voltage circuit breaker.

The opening speed of the common traditional high-voltage circuit breaker is about 5 m/s-10 m/s, while the average opening speed of the high-speed circuit breaker is about 14m/s, which is much higher than that of the common traditional high-voltage circuit breaker. The requirement of the breaker operating power due to the excessively high opening speed is also very strict. At present, a high-speed circuit breaker generally uses a high-power hydraulic operating mechanism as a source of opening and closing power of the high-speed circuit breaker. Currently, research on high-speed circuit breakers is also in the initial stage. With the continuous research, the technology of the high-speed circuit breaker gradually matures. The high-speed circuit breaker can gradually replace the traditional circuit breaker in the high-voltage field by virtue of the advantage of high-speed on-off of fault phase short-circuit current.

Disclosure of Invention

The arc extinguish chamber of the high-speed cut-off circuit breaker is provided for solving the problems in the prior art, effective air blowing can be obtained in the process of cutting off large current, and the reasonable cylinder volume also provides enough air blowing for cutting off small current electric arc and is not prone to wasting operation power. The high-speed high-voltage switch has the advantages of reasonable structural design and good use effect, has quick and good switching-on and switching-off capacity for short-circuit large current or capacitive small current, and achieves the purposes of accelerating the switching-on and switching-off speed, reducing the size of the switch and improving the overall reliability on the basis of keeping the switching-on and switching-off capacity.

The technical scheme adopted by the invention is as follows:

an arc extinguish chamber of a high-speed cut-off circuit breaker comprises an external insulating porcelain bushing, a movable end part, a static end part, an upper wiring board, a lower wiring board and a valve seat;

the movable end part comprises a movable end pull rod, a movable main contact, a pressure cylinder, an arc extinguishing nozzle, an auxiliary nozzle, a nozzle base and a movable arc contact; the pneumatic cylinder is coaxially fixed on the movable end pull rod, the pneumatic cylinder is respectively connected with the arc extinguishing nozzle, the auxiliary nozzle and the movable arc contact and is fixedly connected with the arc extinguishing nozzle, the other end of the movable arc contact is respectively fixedly connected with the valve seat and the movable end pull rod, and the pneumatic cylinder is arranged at one end of the valve seat; the movable arc contact is coaxially arranged in the auxiliary nozzle, the auxiliary nozzle is coaxially arranged in the air cylinder, the arc extinguishing nozzle is coaxially arranged in the nozzle base, the nozzle base is axially connected with the valve seat, the movable main contact is coaxially fixed on the outer side of the valve seat, and the movable main contact is connected with the movable end support;

the static end part comprises a static arc contact, a static main contact, a dynamic end shield cover and a static end shield cover. The static arc contact is rigidly connected to the upper wiring board, the moving arc contact pull rod is provided with a one-way piston, and the outer wall of the one-way piston is matched with the contour of the inner wall of the downstream area of the arc extinguishing nozzle and a gap is reserved between the outer wall of the one-way piston and the inner wall of the downstream area of the arc extinguishing nozzle. The 5 axial circumference parcel quiet arc contacts of arc extinguishing spout, quiet arc contact axial contact move the arc contact, the coaxial support piston support between one-way piston and the lower wiring board, the external diameter of one-way piston is coaxial to be fixed in the one end of moving the main contact, and the axle center of lower wiring board is equipped with the through-hole, moves the end pull rod and stretches out by the through-hole of lower wiring board.

The static arc contact and the moving arc contact are coaxially and oppositely arranged, and the moving main contact and the static main contact are coaxially and oppositely arranged;

move end parts and quiet end parts and install in moving end shield cover and quiet end shield cover coaxially, outer insulating insulator coaxial sets up outside moving end shield cover and quiet end shield cover, and one side of moving the end pull rod is connected to outer insulating insulator one end, seals by the lower wiring board, and open in the lower wiring board axle center has the through-hole, moves the end pull rod and stretches out from the lower wiring board through-hole, and the opposite side of outer insulating insulator seals by last wiring board.

The pneumatic cylinder is characterized in that one end inside the pneumatic cylinder is provided with a one-way piston, the movable end pull rod is coaxially arranged in the middle of the one-way piston, the movable end pull rod is of a hollow structure, an exhaust hole is formed in the thin wall of the movable end pull rod, the radius of the exhaust hole is matched with that of the pneumatic cylinder, and the axis of the movable end pull rod is provided with an air blocking plug.

The invention has the following beneficial effects:

1. the invention adopts a structure that the auxiliary piston is combined with the spout with a certain shape, and achieves the capability of quickly cutting off the electric arc by reasonably arranging the large spout structure by combining the opening speed. When short-circuit large-current arcing period, the pressure cylinder compresses the internal arc-extinguishing gas to generate pressure difference, meanwhile, the throat part of the large nozzle rapidly passes through the upper part of the static arc contact, the high-pressure high-speed arc-extinguishing gas rapidly gushes out from the inside of the pressure cylinder, and the arc is cooled, elongated and extinguished.

2. The movable end pull rod is provided with symmetrically distributed vent holes, the length of each vent hole is matched with that of the piston, and when the movable end pull rod moves to a certain opening distance, the vent holes are exposed to release air; the design is favorable to the improvement of explosion chamber pressure when breaking the undercurrent like this, reduces the possibility of heavy arcing, at the heavy current breaking in-process, can provide more unobstructed two-way air-blast effect.

3. The design mode of high-speed breaking increases the open distance between the contacts a lot within the same arcing time, effectively improves the medium recovery strength and reduces the possibility of re-arcing.

4. In the time of several milliseconds of contact separation, the total volume of a closed area formed by the air cylinder, the auxiliary piston and the arc extinguishing nozzle is reduced, so that the pressure intensity of the space is higher, and the risk of low-current electric arc reignition can be effectively reduced.

5. The special static arc contact structure has the advantages that gas entering from the air cylinder acts on the wall surface of the downstream area of the arc extinguishing nozzle through the auxiliary piston, so that the heat dissipation of an arc gap is facilitated, the auxiliary air chamber can be formed, and the air blowing effect is obviously enhanced.

Drawings

FIG. 1 is a schematic structural diagram of a pneumatic single-action high-speed arc-extinguishing chamber;

the device comprises an upper wiring board 1, a static end shield 2, a static main contact 3, an outer insulating porcelain sleeve 4, an arc extinguishing nozzle 5, a movable main contact 6, a pressure cylinder 7, a one-way piston 8, a movable end shield 9, a piston support 10, an auxiliary nozzle 11, a movable arc contact 12, a static arc contact 13, a movable end support 14, an exhaust hole 15, an air plug 16, a lower wiring board 17, a movable end pull rod 18, a nozzle base 19 and a valve seat 20.

Detailed Description

The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.

An arc extinguish chamber of a high-speed cut-off circuit breaker is shown in figure 1 and comprises an outer insulating porcelain sleeve 4, a movable end part, a static end part, an upper wiring board 1, a lower wiring board 17 and a valve seat 20;

the movable end part comprises a movable end pull rod, a movable main contact 6, a pressure cylinder 7, an arc extinguishing nozzle 5, an auxiliary nozzle 11, a nozzle base and a movable arc contact 12; the pneumatic cylinder 7 is coaxially fixed on the movable end pull rod, the pneumatic cylinder 7 is respectively connected with the arc extinguishing nozzle 5, the auxiliary nozzle 11 and the movable arc contact 12 and is fixedly connected with the arc extinguishing nozzle 5, the other end of the movable arc contact 12 is respectively fixedly connected with the valve seat and the movable end pull rod, and the pneumatic cylinder 7 is arranged at one end of the valve seat; the movable arc contact 12 is coaxially arranged in the auxiliary nozzle 11, the auxiliary nozzle 11 is coaxially arranged in the air cylinder 7, the arc extinguishing nozzle 5 is coaxially arranged in the nozzle base, the nozzle base is axially connected with the valve seat, the movable main contact 6 is coaxially fixed on the outer side of the valve seat, and the movable main contact 6 is connected with the movable end support 14;

the static end part comprises a static arc contact 13, a static main contact 3, a movable end shield cover 9 and a static end shield cover 2. The static arc contact 13 is rigidly connected to the upper wiring board 1, the pull rod of the moving arc contact 12 is provided with a one-way piston 8, and the outer wall of the one-way piston 8 is matched with the contour of the inner wall of the downstream area of the arc extinguishing nozzle 5 and a gap is reserved between the outer wall and the inner wall. The axial circumference of the arc extinguishing nozzle 5 is wrapped by a static arc contact 13, the static arc contact 13 is in axial contact with a moving arc contact 12, a piston support 10 is coaxially supported between a one-way piston 8 and a lower wiring board 17, the outer diameter of the one-way piston 8 is coaxially fixed at one end of a moving main contact 6, a through hole is formed in the axis of the lower wiring board 17, and a moving end pull rod extends out of the through hole of the lower wiring board 17.

The static arc contact 13 and the moving arc contact 12 are coaxially and oppositely arranged, and the moving main contact 6 and the static main contact 3 are coaxially and oppositely arranged;

move end parts and quiet end parts and install in moving end shield 9 and quiet end shield 2 coaxially, outer insulating insulator 4 sets up coaxially outside moving end shield 9 and quiet end shield 2, and one side of moving the end pull rod is connected to outer insulating insulator 4 one end, seals by lower wiring board 17, and lower wiring board 17 axle center is opened there is the through-hole, moves the end pull rod and stretches out from lower wiring board 17 through-hole, and the opposite side of outer insulating insulator 4 is sealed by last wiring board 1.

One end in the air cylinder 7 is provided with a one-way piston 8, a movable end pull rod is coaxially arranged in the middle of the one-way piston 8, the movable end pull rod is of a hollow structure, an exhaust hole 15 is formed in the thin wall of the movable end pull rod, the radius of the exhaust hole 15 is matched with that of the air cylinder 7, and an air blocking plug 16 is arranged at the axis of the movable end pull rod.

One end of the air cylinder 7 is connected with the gas in the arc extinguish chamber through a one-way piston 8, and when the brake is switched off, the air pressure of the air cylinder 7 is higher than the external air pressure, the one-way piston 8 does not act; when the switch is switched on, the air pressure of the air cylinder 7 is smaller than the external air pressure, the one-way piston 8 is opened, and the external air enters the inside of the air cylinder 7 to realize the inflation of the air cylinder 7.

The static arc contact 13 and the moving arc contact 12 are coaxially arranged in the air cylinder 7 and are coaxially assembled in the outer insulating porcelain sleeve 4, and the air cylinder 7, the moving arc contact 12, the auxiliary nozzle 11, the arc extinguishing nozzle 5 and the moving main contact 6 are driven by the moving end pull rod to realize opening movement;

in the time of several milliseconds when the static arc contact 13 and the moving arc contact 12 are separated, the total volume of a closed area formed by the air cylinder 7 and the arc extinguishing nozzle 5 is reduced, so that the pressure intensity of the space is higher, and the risk of failure of switching on and off of the low-current arc can be reduced.

The description of the operation of the arc extinguish chamber of the high-speed cut-off circuit breaker in the embodiment is as follows:

taking the opening process as an example, under the driving of the operating mechanism, the air cylinder 7, the arc extinguishing nozzle 5, the auxiliary nozzle 11, the moving arc contact 12, the moving main contact 6 and the moving end pull rod 18 move rightwards together, and the static arc contact 13 and the static main contact 3 keep static states;

in the arc-extinguishing period, the arc-extinguishing nozzle 5 is opened at a high speed, high-pressure arc-extinguishing gas in the air cylinder 7 quickly rushes to an arc channel, and the arc is cooled and elongated, so that the aim of high-speed arc extinguishing is fulfilled;

in the process of opening the static arc contact 13, high-temperature and high-pressure gas at the end part of the contact enters the air cylinder 7, so that the internal pressure of the air cylinder 7 is further increased, and the arc gap heat dissipation process is facilitated;

in the whole brake separating process, the static end shield cover 2, the dynamic end shield cover 9, the static arc contact 13 and the static main contact 3 are kept still, and the air blocking plug 16 at the lower part of the dynamic end pull rod 18 does not move relative to the dynamic end pull rod 18.