CN213212043U - Circuit breaker and arc extinguish chamber thereof - Google Patents

Abstract

The utility model relates to an arc extinguish chamber, which comprises a static end part and a dynamic end part; the movable end part comprises a cylinder body, a movable main contact, a nozzle, a piston rod and a movable arc contact, wherein an expansion chamber is arranged in the movable main contact, and a pressure air chamber is enclosed between the movable main contact and the cylinder body; the bottom of the air compression chamber is provided with a second vent hole; the air supply valve plate and the guide piece are arranged in the air compression chamber, and the air supply valve plate covers the second vent hole; the air compensating valve sheet is sleeved on the guide piece and can move up and down along the guide piece under the control of the pressure difference between the inside and the outside of the pressure air chamber. The utility model utilizes the matching of the guide piece and the air supply valve piece to ensure that the air supply valve piece can be controlled by the pressure difference between the inside and the outside of the air chamber, moves downwards along the guide piece to close the second vent hole during opening, and moves downwards along the guide piece to open the second vent hole to supply air to the air chamber during closing; the connecting and matching of the springs are not needed, the elastic force of the springs is not needed to be considered, the assembly difficulty of the gas supplementing valve plate is facilitated to be simplified, and the structure of the circuit breaker is further simplified.

Description

Circuit breaker and arc extinguish chamber thereof

Technical Field

The utility model relates to a high tension switchgear technical field, in particular to circuit breaker and explosion chamber thereof.

Background

The high-voltage circuit breaker is a high-voltage switch which is mainly used for switching on and off, controlling or protecting power generation, power transmission, power distribution, electric energy conversion and consumption of a power system. The high-voltage circuit breaker generally adopts a sulfur hexafluoride circuit breaker, and the sulfur hexafluoride gas is used as a circuit breaker for arc extinction and an insulating medium.

In the related art, the structure of an arc extinguishing chamber in a circuit breaker is mainly a compressed air single chamber and a self-energy double chamber. The air compression single chamber is simple in structure, but the arc extinguishing capability is poor, the air compression single chamber is not suitable for switching on and off of small current, and the mechanism operation work is required to be large. The self-energy double-chamber structure has stronger arc extinguishing capacity and smaller operation requirement, but in the current self-energy double-chamber structure, an air supply valve communicated with the inside and the outside of an air compression chamber is usually controlled by a spring, the structure is complex, the elastic value of the spring is not easy to calculate, the design requirement is higher, and the assembly difficulty is higher.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an explosion chamber to simplify the structure of explosion chamber among the prior art, reduce its designing requirement and the assembly degree of difficulty.

Another object of the utility model is to provide a circuit breaker to simplify the structure of circuit breaker among the prior art, reduce its designing requirement and manufacturing cost.

In order to solve the technical problem, the utility model adopts the following technical scheme:

according to one aspect of the present invention, the present invention provides an arc chute comprising a stationary end member and a movable end member; the static end part comprises a static arc contact and a static main contact arranged on the peripheral side of the static arc contact; the moving end member includes: the cylinder body is fixedly arranged below the static arc contact; the movable main contact is of a cylindrical structure and can be movably arranged in the cylinder body; the movable main contact can slide up and down along the inner wall of the cylinder body to be close to or far away from the static main contact; an expansion chamber is formed in the movable main contact, and a pressure air chamber is formed between the bottom of the movable main contact and the inner wall and the inner bottom surface of the cylinder body; the bottom of the movable main contact is provided with a first vent hole for communicating the expansion chamber with the air compression chamber, and the first vent hole is provided with a control valve for allowing air in the air compression chamber to enter the expansion chamber; the nozzle is arranged in the center of the top of the movable main contact, and an inlet of the nozzle is communicated with the expansion chamber and is opposite to the static arc contact; the piston rod is fixedly arranged on the movable main contact, the lower end of the piston rod movably penetrates through the bottom surface of the cylinder body, and the upper end of the piston rod extends into the expansion chamber; the piston rod is used for driving the movable main contact to slide up and down in the cylinder body; the movable arc contact is arranged at the top of the piston rod and is positioned below the nozzle, and the movable arc contact is used for being electrically connected with the static arc contact; the bottom of the air compression chamber is provided with a second vent hole communicated with the outside of the cylinder body; the air compression chamber is internally provided with an air compensation valve plate, and the air compensation valve plate covers the second vent hole; the bottom of the air compression chamber is also provided with a guide piece; the air compensating valve sheet is sleeved on the guide piece and can move up and down along the guide piece under the control of the pressure difference between the inside and the outside of the air compression chamber so as to close or open the second vent hole.

According to some embodiments of the present application, the guide comprises a coaxially connected end head, a guide portion, and a threaded portion; the threaded part is in threaded connection with the bottom surface of the air compression chamber; the air compensation valve plate is provided with a through hole, and the air compensation valve plate is sleeved on the guide part through the through hole and can move up and down along the guide part; the diameter of the end head part is larger than the aperture of the through hole so as to limit the gulp valve sheet on the guide part.

According to some embodiments of the present application, an annular groove is formed in a bottom surface of the air compression chamber and distributed around the piston rod, the second vent hole is formed in the annular groove, and the guide member is formed in the annular groove; the air supply valve plate is annular, and the air supply valve plate is limited in the annular groove through the guide piece so as to close or open the second vent hole.

According to some embodiments of the application, the guide member is provided in plurality, the plurality of guide members being distributed around the piston rod.

According to some embodiments of the application, the second vent hole is provided with a plurality of, and a plurality of second vent holes encircle the piston rod and are all covered by the air supply valve plate.

According to some embodiments of the present application, the control valve includes a stop collar and a control valve plate; the limiting sleeve comprises a shaft sleeve part and a limiting part which are integrally formed, the shaft sleeve part and the limiting part are sleeved on the piston rod, and the limiting part is arranged at the upper end of the shaft sleeve part and protrudes out of the peripheral wall of the shaft sleeve part in the circumferential direction; the control valve plate covers the first vent hole, is annular and is sleeved on the shaft sleeve part; the control valve plate is blocked below the limiting part by the limiting part and can move up and down along the shaft sleeve part.

According to some embodiments of the application, the first vent hole is provided with a plurality of, and is a plurality of the first vent hole encircles the piston rod distribution to all covered by the control valve piece.

According to some embodiments of the present application, the movable main contact comprises a cylinder and a cylinder bottom detachably disposed at the inner bottom of the cylinder; the cylinder bottom is sleeved on the piston rod; the cylinder bottom is in sealing connection with the piston rod, the cylinder bottom is in sealing connection with the cylinder barrel, and the cylinder barrel, the cylinder bottom and the piston rod surround to form the expansion chamber; the spout is arranged at the top of the cylinder barrel, and the first vent hole is arranged on the cylinder bottom.

According to some embodiments of the present application, the movable end component further comprises a fixed sleeve, the fixed sleeve is sleeved on the piston rod and sleeved on the outer peripheral side of the movable arc contact; a gap is formed between the peripheral wall of the fixed sleeve and the inner wall of the spout, and the gap is communicated with the inlet of the spout and the expansion chamber.

According to another aspect of the utility model, the utility model also provides a circuit breaker, this circuit breaker includes foretell explosion chamber.

According to the above technical scheme, the embodiment of the utility model provides an at least have following advantage and positive effect:

the utility model discloses in the explosion chamber, utilize the cylinder body and move the main contact and form piston assembly, move and form the expansion chamber in the main contact, form the plenum chamber between cylinder body and the main contact that moves to utilize the first air vent and the control valve that set up in the bottom of moving the main contact, control the gas flow between expansion chamber and the plenum chamber.

The air supply valve sheet arranged at the bottom of the air compression chamber is used for carrying out one-way control on the air compression chamber; and the air supply valve plate is matched with the control valve, when the brake is switched off, the second vent hole is closed by the air supply valve plate, when the air pressure in the air compression chamber is compressed to the state that the air pressure is greater than the air pressure in the expansion chamber, the air in the air compression chamber enters the expansion chamber through the first vent hole, and the air in the expansion chamber perform arc extinction together, so that the arc extinction performance of the arc extinction chamber is improved.

The guide piece arranged in the air compression chamber is matched with the air supplement valve piece, so that the air supplement valve piece can be controlled by the internal and external pressure difference of the air compression chamber, and moves downwards along the guide piece to close the second vent hole during opening of the brake and moves downwards along the guide piece to open the second vent hole to supplement air to the air compression chamber during closing of the brake. Therefore, the gas supplementing valve plate does not need a spring to be connected and matched, the elastic force of the spring does not need to be considered, the assembling difficulty of the gas supplementing valve plate can be simplified on the premise of realizing the function of the gas supplementing valve plate, the structure of the circuit breaker is further simplified, and the design requirement and the production cost of the circuit breaker are reduced.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an arc extinguishing chamber in the circuit breaker shown in fig. 1 during opening.

Fig. 3 is a schematic structural diagram of an arc extinguishing chamber of the circuit breaker shown in fig. 1 at the time of closing.

Fig. 4 is an enlarged schematic view of the region a in fig. 3.

Fig. 5 is a schematic structural view of the spacing sleeve shown in fig. 4.

Fig. 6 is an enlarged schematic view of a region B in fig. 3.

Fig. 7 is an enlarged schematic view of the region C in fig. 3.

Fig. 8 is a schematic view of the structure of the guide shown in fig. 7.

The reference numerals are explained below:

1. insulating the pole; 11. a cylinder; 12. a base plate; 13. an upper binding post; 14. connecting a wiring column downwards;

2. a stationary end component; 21. a stationary arc contact; 22. a stationary main contact;

3. a moving end member; 31. a cylinder body; 32. a movable main contact; 33. a piston rod; 34. a spout; 35. a moving arc contact; 36. fixing a sleeve; 301. an expansion chamber; 302. a gas compression chamber; 311. a second vent hole; 312. an annular groove; 321. a cylinder barrel; 322. a cylinder bottom; 323. a first vent hole;

4. a control valve; 41. a limiting sleeve; 42. controlling the valve plate; 411. a boss portion; 412. a limiting part;

5. a gas supply valve plate;

6. a guide member; 61. an end portion; 62. a guide portion; 63. a threaded portion;

7. a transmission member;

8. a power input component.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1, and shown in fig. 2 and fig. 3, an embodiment of the present invention provides a circuit breaker including an insulating pole 1 and an arc extinguish chamber disposed in the insulating pole 1.

Referring to fig. 1, an insulating pole 1 is a hollow insulating structure, and is filled with a gas with good breaking and insulating properties, such as sulfur hexafluoride gas, nitrogen gas, etc., so as to perform rapid arc extinction when the arc extinguishing chamber is broken, and serve as an insulating protection medium in the circuit breaker.

In some embodiments, the insulated pole 1 includes a post 11 and a base 12. The column 11 is a hollow column structure with an opening at the bottom, and the column 11 can be made of insulating materials such as ceramics, epoxy resin and the like. The bottom plate 12 is disposed at the bottom opening of the column 11. After the bottom plate 12 and the column 11 are sealed and enclosed, gas as an insulating medium can be sealed in the column 11.

In some embodiments, the column 11 is provided with an upper terminal 13 and a lower terminal 14 which are arranged at an interval from each other.

The upper terminal 13 and the lower terminal 14 are both disposed through the peripheral wall of the column 11, one end of which extends into the column 11 and the other end of which is exposed outside the column 11.

The upper wiring column 13 and the lower wiring column 14 are both conductive metal parts and are respectively used as a high-voltage connecting end and a low-voltage connecting end for being connected with external high voltage and external low voltage, and then a higher voltage difference is formed between the upper wiring column 13 and the lower wiring column 14.

Referring to fig. 2 and 3 in combination with fig. 1, an arc extinguish chamber according to an embodiment of the present invention mainly includes a stationary end member 2 and a movable end member 3.

The stationary end member 2 mainly includes a stationary arcing contact 21 and a stationary main contact 22 provided at intervals on the circumferential side of the stationary arcing contact 21. The static arc contact 21 and the static main contact 22 are both arranged in the insulating pole 1. For example, the stationary arcing contact 21 and the stationary main contact 22 are fixed to the inner end of the upper post 13 and electrically connected to the upper post 13. The structure of the stationary end part 2 is the same as the corresponding structure of the prior art arc chute and will not be described in detail here.

The movable end component 3 mainly comprises a cylinder 31, a movable main contact 32, a piston rod 33, a nozzle 34, a movable arc contact 35 and a fixed sleeve 36.

The cylinder 31 is fixedly disposed in the insulating post 1, such as at the inner end of the lower post 14, and is electrically connected to the lower post 14.

The cylinder 31 is located below the stationary arcing contact 21 and the stationary main contact 22. The top of the cylinder 31 is open, opposite the stationary arcing contact 21 and the stationary main contact 22.

The movable main contact 32 is a cylindrical structure and is movably disposed in the cylinder 31. The movable main contact 32 and the cylinder 31 form a piston structure, the movable main contact 32 can slide up and down along the inner wall of the cylinder 31 to be close to or far away from the static arc contact 21 and the static main contact 22, when the top of the movable main contact 32 is contacted with the static main contact 22, the movable main contact 32 and the static main contact 22 can be electrically connected, and the upper wiring column 13 is electrically connected with the lower wiring column 14 sequentially through the static main contact 22, the movable main contact 32, the cylinder 31 and the lower wiring column 14.

An expansion chamber 301 is formed in the movable main contact 32. A pressure air chamber 302 is enclosed between the bottom of the movable main contact 32, the inner wall of the cylinder 31 and the inner bottom surface of the cylinder 31.

The nozzle 34 is fixedly arranged at the top center of the movable main contact 32. The inlet of the nozzle 34 communicates with the expansion chamber 301, and the gas in the expansion chamber 301 can leave the expansion chamber 301 through the inlet of the nozzle 34. The inlet of the spout 34 is located below the stationary arcing contact 21 and opposite the stationary arcing contact 21. When the spout 34 moves upward with the moving main contact 32 to approach the stationary arcing contact 21, the stationary arcing contact 21 may extend into an inlet of the spout 34.

The piston rod 33 is fixed on the movable main contact 32 along the axial direction of the movable main contact 32. In some embodiments, the piston rod 33 may be fixed directly on the central axis of the moving main contact 32. The piston rod 33 is used for driving the movable main contact 32 to slide up and down in the cylinder 31.

The lower end of the piston rod 33 movably penetrates the bottom surface of the cylinder 31, and the upper end of the piston rod 33 passes through the air compression chamber 302 and is extended into and arranged in the expansion chamber 301.

In some embodiments, the movable main contact 32 may include a cylinder 321 and a cylinder bottom 322 detachably disposed at an inner bottom of the cylinder 321. The bottom of the cylinder 321 is open, and the outer peripheral wall of the cylinder 321 and the inner wall of the cylinder 31 can slide up and down. The spout 34 is provided at the top of the cylinder 321.

The cylinder bottom 322 is disposed at the bottom opening of the cylinder barrel 321, and the cylinder bottom 322 is sleeved on the piston rod 33. The cylinder bottom 322 and the cylinder barrel 321 and the cylinder bottom 322 and the piston rod 33 are hermetically connected. The expansion chamber 301 is formed between the cylinder 321, the cylinder bottom 322, and the piston rod 33.

Referring to fig. 3 in combination with fig. 4, a first vent hole 323 for communicating the expansion chamber 301 and the air compression chamber 302 is formed at the bottom of the expansion chamber 301, that is, the first vent hole 323 is formed at the cylinder bottom 322 at the bottom of the movable main contact 32.

The first vent 323 is provided with a control valve 4 for the gas in the air compression chamber 302 to enter the expansion chamber 301.

In some embodiments, the control valve 4 may employ a check valve. When the control valve 4 is opened, the gas in the air compression chamber 302 can enter the expansion chamber 301, and the gas in the expansion chamber 301 cannot enter the air compression chamber 302. When the control valve 4 is closed, the expansion chamber 301 and the air compression chamber 302 are isolated from each other.

Referring to fig. 4 and 5, in some embodiments, the control valve 4 may be disposed within the expansion chamber 301. The control valve 4 may include a separate stop collar 41 and a control valve plate 42.

The position restricting sleeve 41 includes a boss portion 411 and a position restricting portion 412 that are integrally formed. The sleeve portion 411 and the limiting portion 412 are sleeved on the piston rod 33. The limiting portion 412 is disposed at the upper end of the sleeve portion 411 and protrudes circumferentially from the outer circumferential wall of the sleeve portion 411.

The control valve sheet 42 covers the first vent hole 323. The control valve plate 42 is annular, and the control valve plate 42 is arranged around the piston rod 33 and sleeved on the shaft sleeve portion 411. The inner diameter of the control valve plate 42 is smaller than the outer diameter of the limiting part 412, so the control valve plate 42 can be blocked below the limiting part 412 by the limiting part 412. The thickness of the control valve plate 42 is smaller than the length of the boss 411, so the control valve plate 42 can move up and down along the boss 411.

The control valve plate 42 is controlled by the air pressure difference between the expansion chamber 301 and the air pressure chamber 302 to move up and down along the boss 411. When the air pressure in the expansion chamber 301 is greater than the air compression chamber 302, the control valve plate 42 moves downward along the boss 411, and the first vent hole 323 is closed by the control valve plate 42. When the air pressure in the air compression chamber 302 is higher than that in the expansion chamber 301, the control valve plate 42 moves downward along the boss 411, and the first vent hole 323 is opened, so that the air in the air compression chamber 302 can enter the expansion chamber 301.

In some embodiments, the first vent 323 is provided in plurality. The first vent holes 323 are disposed on the cylinder bottom 322 and distributed around the piston rod 33, and the first vent holes 323 are covered by the control valve plate 42. The increase of the number of the first vent holes 323 can increase the air inlet speed and the air inlet amount of the gas in the air compression chamber 302 which can enter the expansion chamber 301, thereby effectively reducing the operation power during opening.

Referring to fig. 3 and 6, the moving arc contact 35 is disposed on the top of the piston rod 33 and below the nozzle 34.

When the switch-on action is performed, the moving arc contact 35 moves upwards along with the piston rod 33 to be close to the static arc contact 21, and the static arc contact 21 can extend into the inlet of the nozzle 34 and is electrically connected with the moving arc contact 35. At this time, the upper terminal 13 is electrically connected to the lower terminal 14 through the stationary contact 21, the moving contact 35, the piston rod 33, the cylinder bottom 322, the cylinder 321, and the cylinder 31 in this order.

When the brake is opened, the moving arc contact 35 moves downwards along with the piston rod 33 to be far away from the static arc contact 21, the static arc contact 21 can be separated from the moving arc contact 35, and a high-voltage arc is formed between the static arc contact 21 and the moving arc contact 35. At this time, the gas in the arc region is heated by the generation of the high-voltage arc, so that the gas pressure in the expansion chamber 301 is increased rapidly, and when the current crosses zero, the high-voltage gas stored in the expansion chamber 301 blows the arc in the inlet of the nozzle 34 to extinguish the arc, thereby realizing self-energy expansion arc extinction.

Referring to fig. 6 in conjunction with fig. 3, the fixed sleeve 36 is disposed on the piston rod 33 and sleeved on the outer periphery of the moving arc contact 35. A gap is formed between the outer peripheral wall of the fixing sleeve 36 and the inner wall of the spout 34, and the gap communicates the inlet of the spout 34 with the expansion chamber 301. The fixed sleeve 36 can limit the moving arc contact 35, so that the moving arc contact 35 is prevented from being extruded and deformed in the long-term switching-on and switching-off processes, and further outward bending deformation occurs, the problem that the gap between the fixed sleeve 36 and the nozzle 34 is reduced is solved, and the normal and stable operation of arc extinguishing is effectively guaranteed.

Referring to fig. 2 and 3, the bottom of the air compressing chamber 302 is provided with a second vent hole 311 for communicating the air compressing chamber 302 with the outside of the cylinder 31, that is, the second vent hole 311 is opened on the bottom surface of the cylinder 31.

The air supply valve plate 5 is arranged in the air compression chamber 302, and the air supply valve plate 5 covers the second vent hole 311.

The bottom of the plenum 302 is also provided with a guide 6, the guide 6 being parallel to the axis of the piston rod 33. The air supply valve plate 5 is provided with a through hole and sleeved on the guide piece 6 through the through hole, and the air supply valve plate 5 can move up and down along the guide piece 6 under the control of the pressure difference between the inside and the outside of the pressure air chamber 302 so as to close or open the second vent hole 311.

When the switch-on action is performed, the movable main contact 32 moves upwards along with the piston rod 33, the air compression chamber 302 expands, the internal air pressure of the air compression chamber 302 gradually decreases, when the air pressure outside the air compression chamber 302 is greater than the internal air pressure of the air compression chamber 302, the air compensation valve piece 5 is pushed open under the action of the air pressure difference, namely, moves upwards along the guide piece 6, the second vent hole 311 is opened, the air outside the air compression chamber 302 enters the air compression chamber 302, and air compensation is performed on the air compression chamber 302 until the internal and external pressure difference is balanced. Compared with the existing structure of the air compensation valve plate 5 adopting the spring, in the process, the air compensation valve plate 5 does not need to overcome the resistance of the spring, and the closing resistance can be effectively reduced; meanwhile, the elastic force of the spring does not need to be calculated, so that the production cost and the assembly difficulty can be effectively reduced.

When the opening operation is performed, the movable main contact 32 moves downwards along with the piston rod 33, the air compression chamber 302 is compressed, the air pressure in the air compression chamber is larger than the air pressure outside the air compression chamber 302, the air compensation valve sheet 5 moves downwards under the action of the air pressure difference, the second air vent 311 is closed, the air pressure in the air compression chamber 302 is further increased gradually, when the air pressure in the air compression chamber 302 is larger than the air pressure in the expansion chamber 301, the first air vent 323 can be opened, the air in the air compression chamber 302 enters the expansion chamber 301, the expansion chamber 301 is inflated, and the air in the expansion chamber 301 are extinguished together, so that the air compression and arc extinction are realized.

In some embodiments, the second ventilation holes 311 may be provided in plural, and the plural second ventilation holes 311 are all opened on the bottom surface of the cylinder 31 and distributed around the piston rod 33. The air supply valve plate 5 is annular, and the annular air supply valve plate 5 is distributed around the piston rod 33 and covers all the second vent holes 311. The increase of the number of the second vent holes 311 can improve the air supply speed and the air supply amount, thereby further reducing the closing resistance, effectively reducing the closing operation, being beneficial to improving the closing speed and carrying out quick closing.

In some embodiments, the guide member 6 may be provided in plurality, and the plurality of guide members 6 are distributed around the piston rod 33. The air supplement valve plates 5 are simultaneously sleeved on the plurality of guide pieces 6, so that the stability and the stationarity of the up-and-down movement of the air supplement valve plates 5 can be improved.

Referring to fig. 3 in conjunction with fig. 7, in some embodiments, the bottom surface of the air compression chamber 302 is provided with annular grooves 312 distributed around the piston rod 33. The second ventilation hole 311 is opened in the annular groove 312, and the guide 6 is provided on the inner bottom surface of the annular groove 312. The air supply valve plate 5 is annular and is limited in the annular groove 312 through the guide piece 6 so as to close or open the second vent hole 311. The annular groove 312 is beneficial to the installation of the air compensation valve plate 5, and the air compensation speed and the air compensation amount can be reasonably controlled through the size design of the annular groove 312 and the air compensation valve plate 5.

Referring to fig. 7 and 8, in some embodiments, the guide member 6 includes a head portion 61, a guide portion 62, and a threaded portion 63 that are coaxially connected.

The threaded portion 63 is threadedly coupled to the bottom surface of the air compression chamber 302 to facilitate fixedly disposing the guide 6 in the air compression chamber 302 and, at the same time, to facilitate mounting and dismounting of the guide 6.

The guide part 62 penetrates through the through hole on the air compensation valve plate 5, and the length of the guide part 62 is greater than the thickness of the air compensation valve plate 5, so that the air compensation valve plate 5 can move up and down along the guide part 62. The guide portion 62 may have a cylindrical structure with a smooth outer peripheral wall so that the air supplement valve sheet 5 can move on the guide portion 62.

The diameter of the end part 61 is larger than the aperture of the through hole, so that the air compensating valve plate 5 can be limited on the guide part 62 to move, and the air compensating valve plate 5 is prevented from being separated from the guide part 62.

Referring to fig. 1, in some embodiments, the arc extinguish chamber further comprises a transmission member 7, and the transmission member 7 is disposed in the insulating pole 1 and connected to the piston rod 33. The piston rod 33 is in transmission connection with the power input component 8 arranged on the outer wall of the insulated pole 1 through the transmission component 7. The power input component 8 is used for controlling and driving the motion of the piston rod 33, and further controlling the moving end component 3 and the static end component 2 of the arc extinguish chamber to perform opening and closing actions.

The embodiment of the utility model provides an operating principle of explosion chamber is:

during a closing operation, the piston rod 33 moves the movable main contact 32 toward the stationary end member 2. The pressure in the air compression chamber 302 is reduced to be lower than the pressure in the expansion chamber 301, and the control valve plate 42 closes the first air vent 323. Meanwhile, the air pressure is lower than the external air pressure of the air compression chamber 302, the air compression chamber 302 immediately pushes the air compensation valve plate 5 open, so that the air compensation valve plate 5 moves upwards along the guide column, the air compression chamber 302 enters the air compression chamber 302 through the second vent hole 311, the closing air compensation operation is completed, the internal and external pressure difference is balanced, and the closing resistance is effectively reduced.

During the opening operation, the piston rod 33 drives the movable main contact 32 to move away from the stationary end part 2. During this opening movement, the stationary main contact 22 is first separated from the moving main contact 32, and the current is transferred to the stationary arcing contact 21 and the moving arcing contact 35 which are still in contact connection. When the stationary arcing contact 21 is separated from the moving arcing contact 35, an arc is generated between the stationary arcing contact 21 and the moving arcing contact 35. The arc energy is large, so that the gas in the arc region is heated and expanded, flows into the expansion chamber 301, increases the pressure in the expansion chamber 301, closes the first vent hole 323 by the control valve plate 42, and when the current is zero, the high-pressure gas stored in the expansion chamber 301 can be blown to the arc, thereby performing self-energy expansion arc extinction. Meanwhile, in the process of opening movement, the air pressure in the air compression chamber 302 is gradually increased, the first vent hole 323 is closed by the control valve plate 42, and the second vent hole 311 is closed by the air compensation valve plate 5; when the air pressure in the air compression chamber 302 is greater than the air pressure in the expansion chamber 301, the first vent 323 is opened, and the air in the air compression chamber 302 enters the expansion chamber 301 and blows to the arc area together with the air in the expansion chamber 301, so that air compression and arc extinction are realized.

In the process of opening and extinguishing arc, the larger the opening current between the static arc contact 21 and the moving arc contact 35 is, the higher the generated arc energy is, the larger the air pressure stored in the expansion chamber 301 is, and the gas in the air compression chamber 302 needs to reach a larger pressure value to enter the expansion chamber 301. By utilizing the structure of the matching of the air compensating valve plate 5 and the guide post, the first vent hole 323 is always in a closed state in the arc extinguishing process, so the air pressure in the air compression chamber 302 is finally higher than the air pressure in the expansion chamber 301, and the air in the air compression chamber 302 finally enters the expansion chamber 301 and is extinguished together with the air in the expansion chamber 301.

Based on the technical scheme, the embodiment of the utility model provides an at least, following advantage and positive effect have:

in the arc extinguish chamber of the embodiment of the utility model, the air supply valve sheet 5 arranged at the bottom of the air compression chamber 302 is used for carrying out one-way control on the air compression chamber 302; and cooperate with control valve 4, when the separating brake is cut off, the aeration valve 5 closes the second vent hole 311, when the gas in the air compression chamber 302 is compressed to the atmospheric pressure and is greater than the atmospheric pressure in the expansion chamber 301, the gas in the air compression chamber 302 enters the expansion chamber 301 through the first vent hole 323, arc extinguishing with the gas in the expansion chamber 301, in order to improve the arc extinguishing performance of the arc extinguishing chamber. Meanwhile, the guide piece 6 arranged in the air compression chamber 302 is matched with the air supplement valve piece 5, so that the air supplement valve piece 5 can be controlled by the pressure difference between the inside and the outside of the air compression chamber 302, move downwards along the guide piece 6 to close the second vent hole 311 during opening, and move downwards along the guide piece 6 to open the second vent hole 311 during closing to supplement air to the air compression chamber 302. Therefore, the gas supplementing valve plate 5 is not required to be connected and matched with a spring, the elastic force of the spring is not required to be considered, the assembling difficulty of the gas supplementing valve plate 5 can be simplified on the premise of realizing the function of the gas supplementing valve plate 5, the structure of the circuit breaker is further simplified, and the design requirement and the production cost of the circuit breaker are reduced.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. An arc extinguish chamber is characterized by comprising a static end part and a dynamic end part;

the static end part comprises a static arc contact and a static main contact arranged on the peripheral side of the static arc contact;

the moving end member includes:

the cylinder body is fixedly arranged below the static arc contact;

the movable main contact is of a cylindrical structure and can be movably arranged in the cylinder body; the movable main contact can slide up and down along the inner wall of the cylinder body to be close to or far away from the static main contact; an expansion chamber is formed in the movable main contact, and a pressure air chamber is formed between the bottom of the movable main contact and the inner wall and the inner bottom surface of the cylinder body; the bottom of the movable main contact is provided with a first vent hole for communicating the expansion chamber with the air compression chamber, and the first vent hole is provided with a control valve for allowing air in the air compression chamber to enter the expansion chamber;

the nozzle is arranged in the center of the top of the movable main contact, and an inlet of the nozzle is communicated with the expansion chamber and is opposite to the static arc contact;

the piston rod is fixedly arranged on the movable main contact, the lower end of the piston rod movably penetrates through the bottom surface of the cylinder body, and the upper end of the piston rod extends into the expansion chamber; the piston rod is used for driving the movable main contact to slide up and down in the cylinder body; and

the movable arc contact is arranged at the top of the piston rod and is positioned below the nozzle, and the movable arc contact is used for being electrically connected with the static arc contact;

the bottom of the air compression chamber is provided with a second vent hole communicated with the outside of the cylinder body; the air compression chamber is internally provided with an air compensation valve plate, and the air compensation valve plate covers the second vent hole; the bottom of the air compression chamber is also provided with a guide piece; the air compensating valve sheet is sleeved on the guide piece and can move up and down along the guide piece under the control of the pressure difference between the inside and the outside of the air compression chamber so as to close or open the second vent hole.

2. The arc chute of claim 1, wherein the guide comprises a coaxially connected end head, guide portion and threaded portion;

the threaded part is in threaded connection with the bottom surface of the air compression chamber;

the air compensation valve plate is provided with a through hole, and the air compensation valve plate is sleeved on the guide part through the through hole and can move up and down along the guide part;

the diameter of the end head part is larger than the aperture of the through hole so as to limit the gulp valve sheet on the guide part.

3. The arc extinguish chamber according to claim 1, wherein the bottom surface of the plenum chamber is provided with an annular groove distributed around the piston rod, the second vent hole is arranged in the annular groove, and the guide member is arranged in the annular groove;

the air supply valve plate is annular, and the air supply valve plate is limited in the annular groove through the guide piece so as to close or open the second vent hole.

4. Arc chute according to claim 1, characterized in that said guide is provided in a plurality, distributed around said piston rod.

5. The arc chute according to claim 1, characterized in that a plurality of second vent holes are provided, and the plurality of second vent holes are distributed around the piston rod and are all covered by the air compensation valve plate.

6. The arc chute of claim 1, wherein the control valve comprises a stop collar and a control valve plate;

the limiting sleeve comprises a shaft sleeve part and a limiting part which are integrally formed, the shaft sleeve part and the limiting part are sleeved on the piston rod, and the limiting part is arranged at the upper end of the shaft sleeve part and protrudes out of the peripheral wall of the shaft sleeve part in the circumferential direction;

the control valve plate covers the first vent hole, is annular and is sleeved on the shaft sleeve part; the control valve plate is blocked below the limiting part by the limiting part and can move up and down along the shaft sleeve part.

7. The arc chute according to claim 6, characterized in that the first vent holes are provided in plurality, and the plurality of first vent holes are distributed around the piston rod and are all covered by the control valve plate.

8. The arc extinguish chamber according to claim 1, wherein the movable main contact comprises a cylinder barrel and a cylinder bottom detachably arranged at the inner bottom of the cylinder barrel;

the cylinder bottom is sleeved on the piston rod;

the cylinder bottom is in sealing connection with the piston rod, the cylinder bottom is in sealing connection with the cylinder barrel, and the cylinder barrel, the cylinder bottom and the piston rod surround to form the expansion chamber;

the spout is arranged at the top of the cylinder barrel, and the first vent hole is arranged on the cylinder bottom.

9. The arc chute according to claim 1, wherein said moving end member further comprises a fixed sleeve, said fixed sleeve is disposed on said piston rod and sleeved on an outer peripheral side of said moving arc contact;

a gap is formed between the peripheral wall of the fixed sleeve and the inner wall of the spout, and the gap is communicated with the inlet of the spout and the expansion chamber.

10. A circuit breaker characterized by comprising an arc chute according to any one of claims 1-9.

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