Split type double-cut instantaneous circuit breaker

Abstract

The present application relates to the technical field of instantaneous breaker, and discloses a split type double-cut instantaneous breaker, which comprises an upper shell and at least two single-phase copper bars, the inner part of the upper shell is respectively provided with a cutting mechanism and a buffer mechanism, the cutting mechanism comprises a trigger, a double-cut striker and a sealing ring, the surface of the trigger is fixedly arranged on the inner wall of the upper shell, the double-cut striker is arranged below the trigger, the surface of the double-cut striker is provided with an annular groove, two groups of protrusions are integrally formed on the surface of the double-cut striker, the number of each group of protrusions is two, and the sealing ring is sleeved on the annular groove in the surface of the double-cut striker. The split type double-cut instantaneous breaker can avoid the problems of slow breaking speed, inability to synchronously disconnect two paths, fixed protection parameters, difficulty in considering arc extinguishing and layout, and poor fault protection reliability of the traditional electric drive protection device under the action of the cutting mechanism, and can stabilize the position and form of the single-phase copper bar after cutting.

Description

Technical Field

[0001] This invention relates to the field of instantaneous circuit breaker technology, specifically a split-type double-cut instantaneous circuit breaker. Background Technology

[0002] Instantaneous circuit breakers are the core overcurrent protection devices in the high-voltage circuit of three-phase electric drive systems. They can quickly disconnect faulty circuits and ensure the safety of the entire equipment. Three-phase electric drive systems are widely used in industrial automation, electric vehicles, rail transportation, and aerospace. During system operation, overcurrent and short-circuit faults are the main factors that endanger equipment safety and power supply reliability.

[0003] Currently, fast-acting fuses, semiconductor protection fuses, thermal-magnetic or electronic circuit breakers, power semiconductor devices, mechanical switches and power semiconductors are mainly used to solve overcurrent and short-circuit faults. However, they cannot solve the problems of easy false tripping, slow action speed, inability to link protection, fixed protection parameters, and inability to adapt to load changes. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a split-type dual-cut instantaneous circuit breaker, which has the advantages of microsecond-level rapid breaking, synchronous cutting of dual copper busbars, modular customization, flexible spatial layout, and reliable arc protection. It solves the problems of slow breaking speed, inability to disconnect two circuits synchronously, fixed protection parameters, difficulty in balancing arc extinguishing and layout, and poor reliability of fault protection of traditional electric drive protection devices.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: comprising an upper housing and at least two single-phase copper busbars, wherein a cutting mechanism and a buffering mechanism are respectively provided inside the upper housing; The cutting mechanism includes: A trigger, the surface of which is fixedly disposed on the inner wall of the upper housing; A double-cutting striker is disposed below the trigger. The surface of the double-cutting striker has an annular groove and two sets of protrusions integrally formed on the surface of the double-cutting striker, with each set of protrusions having two protrusions. A sealing ring, wherein the sealing ring is fitted into an annular groove on the surface of the double-cutting impact pin; When the trigger receives an external signal, it generates gas. The gas accumulates in the sealed cavity between the trigger, the upper housing, the double-cutting striker and the sealing ring. The increased pressure in the sealed cavity pushes the double-cutting striker to cut off the two single-phase copper busbars below.

[0006] Preferably, the buffer mechanism includes: Two cylindrical holes are formed on the surface of the double-cutting firing pin; Two sets of jet holes are opened on the surface of the double-cutting firing pin. The internal cavity of each cylindrical hole is connected to the internal cavity of the two jet holes on the same side. Arc extinguishing powder is placed in the cavity of each jet hole. Two support columns are provided below the cylindrical hole, and each support column can be divided into an upper part and a lower part; The double-cutting striker moves downward under pressure. After the support column enters the cylindrical hole, it compresses the gas sealed inside the cylindrical hole. The compressed gas drives the arc-extinguishing powder to be ejected through the jet hole.

[0007] Preferably, the lower half of each support column is conical, the diameter of the lower half of the support column gradually increases from top to bottom, the diameter of the bottom of the support column is larger than the diameter of the cylindrical hole, and the opening of the cylindrical hole is covered with a layer of rubber.

[0008] Preferably, the upper half of the support column has a circular truncated structure that is narrower at the top and wider at the bottom, and the lower truncated structure of the upper half of the support column can be fitted into the inside of the cylindrical hole with a clearance fit. The frustum structure on the support column can change the rate at which gas flows through the gap between the support column and the double-cutting impact pins according to the different positions of the double-cutting impact pins.

[0009] Preferably, the inner wall of the upper housing is fixedly provided with a wire interface, which is electrically connected to the trigger via a wire.

[0010] Preferably, a plastic shell is fixedly disposed on the surface of the single-phase copper busbar, and an isolation rib is fixedly disposed on the surface of the plastic shell. A notch is opened in the middle of the plastic shell, and the double-cutting striker is disposed at the notch in the middle of the plastic shell. The protrusion on the surface of the double-cutting striker contacts the surface of the plastic shell.

[0011] Preferably, a lower shell is provided below the plastic shell, and the bottom end of each support column is fixedly provided to the inner bottom wall of the lower shell. Two bolts are provided inside the upper shell, and each bolt passes through the upper shell, the plastic shell and the lower shell in sequence and extends into the interior of the lower shell. The surface of each bolt is threaded to the inner wall of the lower shell.

[0012] Preferably, the surfaces of the two single-phase copper busbars below the double-cutting striker are provided with weak fractures of arbitrary shapes, and the surface of each single-phase copper busbar is provided with two mounting holes, which can be used for threaded assembly or welding fixation. The inner wall of the double-cutting striker is fixedly provided with a placement component, and the arc extinguishing powder is placed inside the placement component. The fracture surface of the single-phase copper busbar can accelerate the cutting speed of the double-cutting pin and fix the fracture position.

[0013] Preferably, two parallel fuses are provided below the lower housing. Each parallel fuse includes two connecting copper pieces. Each connecting copper piece penetrates the plastic housing and extends into the interior of the plastic housing. Each connecting copper piece is fixedly disposed on the surface of a single-phase copper busbar.

[0014] Preferably, two parallel fuses are provided below the lower housing, and the lower housing covers the two parallel fuses. Each parallel fuse includes two connecting copper pieces. Each connecting copper piece passes through the lower housing and the plastic shell in sequence and extends into the interior of the plastic shell. Each connecting copper piece is fixedly disposed on the surface of the single-phase copper busbar.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a split-type double-cut instantaneous interrupter, which has the following beneficial effects: 1. This split-type double-cut instantaneous circuit breaker is equipped with a trigger. Upon receiving an electrical signal, the trigger rapidly generates gas, which instantly increases the air pressure in the sealed cavity between the trigger, the upper housing, the double-cutting pin, and the sealing ring. This pushes the double-cutting pin downwards rapidly, striking the two single-phase copper busbars below it and cutting them off. After cutting off the single-phase copper busbars, the double-cutting pin remains between the cut single-phase copper busbars to prevent deformation due to high temperature. Therefore, under the action of the cutting mechanism, it can not only avoid the problems of slow breaking speed, inability to disconnect two circuits simultaneously, fixed protection parameters, difficulty in balancing arc extinguishing and layout, and poor fault protection reliability of traditional electric drive protection devices, but also ensure the stability of the position and shape of the cut single-phase copper busbars. 2. By incorporating a support column, when the double-cutting striker moves downward under pressure, the support column enters the cylindrical bore. This causes the support column to compress the gas inside the bore, which is then ejected from the jet nozzle and the gap between the support column and the bore. This further stimulates the ejection of arc-extinguishing powder from the jet nozzle, thus extinguishing the arc. Furthermore, the diameter of the upper truncated cone in the upper part of the support column is smaller than the diameter of the cylindrical bore. Therefore, although the initial entry of the support column into the double-cutting striker compresses the gas flow inside the bore, it does not affect the downward movement of the double-cutting striker, ensuring its stability. There is sufficient power to cut off the single-phase copper busbar. After the double-cutting striker cuts off the single-phase copper busbar, the upper half of the support column's truncated cone will completely enter the cylindrical hole. The diameter of the lower truncated cone in the upper half of the support column is similar to the inner diameter of the cylindrical hole. Therefore, the space for the gas inside the cylindrical hole to be ejected outward can be reduced. The gas inside the cylindrical hole cannot be ejected instantaneously, thus achieving the purpose of air damping, reducing the kinetic energy after the double-cutting striker cuts off the copper busbar, and reducing the impact between the double-cutting striker and the lower housing. Under the action of the buffer mechanism, not only can the arc extinguishing effect be accelerated, but the kinetic energy after the double-cutting striker breaks through the single-phase copper busbar can also be reduced. 3. The lower half of the support column is conical. Therefore, after the double-cutting striker moves downward after cutting the single-phase copper busbar, the rubber layer covering the surface of the double-cutting striker will gradually come into contact with the surface of the support column. During this process, the rubber layer will deform, further reducing the kinetic energy of the double-cutting striker after cutting the single-phase copper busbar. In addition, the rubber layer covering the surface of the double-cutting striker will also increase the friction between the double-cutting striker and the surface of the support column. The friction can be used to avoid the problem of the double-cutting striker rebounding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is an exploded view of the dual-cut instantaneous interruptor of the present invention.

[0018] Figure 3 For the present invention Figure 2 A magnified view of a portion of point A in the middle.

[0019] Figure 4 This is a schematic diagram of the support column of the present invention.

[0020] Figure 5 This is a bottom view of the double-cutting striker structure of the present invention.

[0021] Figure 6 This is a cross-sectional view of the double-cutting striker of the present invention.

[0022] Figure 7 This is a planar schematic diagram of the dual-cut instantaneous interruptor of the present invention.

[0023] Figure 8 This is a bottom view of the single-phase copper busbar structure of the present invention.

[0024] In the diagram: 1. Upper housing; 201. Trigger; 202. Double-cut striker; 203. Sealing ring; 204. Break; 301. Support column; 302. Air jet hole; 303. Cylindrical hole; 304. Placement component; 4. Parallel fuse; 5. Single-phase copper busbar; 6. Plastic shell; 7. Bolt; 8. Wire interface; 9. Lower housing; 10. Isolation rib; 11. Mounting hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Example 1: A split-type double-cut instantaneous interrupter is provided, which has the following technical features.

[0030] Please see Figures 1-8 A split-type double-cut instantaneous circuit breaker includes an upper housing 1 and at least two single-phase copper busbars 5. The upper housing 1 is equipped with a cutting mechanism and a buffer mechanism respectively. The cutting mechanism includes: Trigger 201, the surface of trigger 201 is fixedly disposed on the inner wall of the upper housing 1; The double-cutting striker 202 is located below the trigger 201. The surface of the double-cutting striker 202 has an annular groove and two sets of protrusions integrally formed on the surface of the double-cutting striker 202, with two protrusions in each set. The sealing ring 203 is fitted into the annular groove on the surface of the double-cutting impact pin 202; After receiving an external signal, the trigger 201 generates gas, which accumulates in the sealed cavity between the trigger 201, the upper housing 1, the double-cutting striker 202 and the sealing ring 203. The increased pressure in the sealed cavity pushes the double-cutting striker 202 to cut off the two single-phase copper busbars 5 below.

[0031] It should be noted that, by setting the trigger 201, the wire interface 8 can transmit the electrical signal transmitted by the wire to the trigger 201. After receiving the electrical signal, the trigger 201 can quickly generate gas. The gas will instantly increase the air pressure in the sealed cavity between the trigger 201, the upper housing 1, the double-cutting striker 202 and the sealing ring 203, pushing the double-cutting striker 202 to move downward rapidly and strike the two single-phase copper busbars 5 below the double-cutting striker 202. The surfaces of the two single-phase copper busbars 5 below the double-cutting striker 202 are both provided with fracture surfaces 204. The shape of the fracture surfaces 204 is preferably triangular. The presence of 04 increases the rate at which the double-cutting striker 202 breaks the single-phase copper busbar 5, cutting off the two single-phase copper busbars 5. In addition, after the double-cutting striker 202 completes the cutting of the single-phase copper busbar 5, it will stay between the cut single-phase copper busbars 5 to prevent the cut single-phase copper busbars 5 from deforming due to high temperature. Therefore, under the action of the cutting mechanism, not only can the problems of slow breaking speed, inability to disconnect two circuits synchronously, fixed protection parameters, difficulty in balancing arc extinguishing and layout, and poor reliability of fault protection of traditional electric drive protection devices be avoided, but the position and shape of the cut single-phase copper busbar 5 can also be stabilized.

[0032] Further, the buffer mechanism includes: Two cylindrical holes 303 are formed on the surface of the double-cutting firing pin 202; Two sets of jet holes 302 are opened on the surface of the double-cutting striker 202. The internal cavity of each cylindrical hole 303 is connected to the internal cavity of the two jet holes 302 on the same side. Arc extinguishing powder is placed in the cavity of each jet hole 302. Two support columns 301 are provided below the cylindrical hole 303. Each support column 301 can be divided into an upper part and a lower part. The double-cutting striker 202 moves downward under pressure. After the support column 301 enters the cylindrical hole 303, it squeezes the gas sealed inside the cylindrical hole 303. The squeezed gas drives the arc-extinguishing powder to be ejected through the jet hole 302.

[0033] It should be noted that when the double-cutting striker 202 moves downward under pressure, the support column 301 enters the interior of the cylindrical hole 303. Therefore, the support column 301 compresses the gas inside the cylindrical hole 303, and the gas is ejected from the jet hole 302 and the gap between the support column 301 and the cylindrical hole 303. This further promotes the ejection of arc-extinguishing powder from the space inside the jet hole 302, thus extinguishing the arc. Additionally, the diameter of the upper frustum in the upper part of the support column 301 is smaller than the diameter of the cylindrical hole 303. Therefore, when the support column 301 initially enters the interior of the double-cutting striker 202, although it compresses the gas flow inside the cylindrical hole 303, it does not... The downward movement force of the double-cutting striker 202 is affected, ensuring that the double-cutting striker 202 has sufficient power to cut the single-phase copper busbar 5. After the double-cutting striker 202 cuts the single-phase copper busbar 5, the upper part of the frustum of the support column 301 will completely enter the cylindrical hole 303. The diameter of the lower frustum of the upper part of the support column 301 is similar to the inner diameter of the cylindrical hole 303. Therefore, the space for the gas inside the cylindrical hole 303 to be ejected outward can be reduced. The gas inside the cylindrical hole 303 cannot be ejected instantaneously, so it can play the purpose of air damping, reduce the kinetic energy of the double-cutting striker 202 after cutting the copper busbar, and reduce the impact between the double-cutting striker 202 and the lower housing 9.

[0034] Furthermore, the lower half of each support column 301 is conical, and the diameter of the lower half of the support column 301 gradually increases from top to bottom. The diameter of the bottom surface of the support column 301 is larger than the diameter of the cylindrical hole 303, and the opening of the cylindrical hole 303 is covered with a layer of rubber.

[0035] It should be noted that the lower half of the support column 301 is conical. Therefore, after the double-cutting striker 202 moves downward after cutting the single-phase copper busbar 5, the rubber layer covering the surface of the double-cutting striker 202 will gradually come into contact with the surface of the support column 301. During this process, the rubber layer will deform, further reducing the kinetic energy of the double-cutting striker 202 after cutting the single-phase copper busbar 5. In addition, the rubber layer covering the surface of the double-cutting striker 202 will also increase the friction between the double-cutting striker 202 and the surface of the support column 301. The friction can be used to avoid the problem of the double-cutting striker 202 rebounding.

[0036] Furthermore, the upper part of the support column 301 is a circular platform structure that is narrower at the top and wider at the bottom, and the lower platform of the upper part of the support column 301 can be fitted into the cylindrical hole 303 with a clearance fit.

[0037] It should be noted that the frustum structure on the support column 301 can change the rate at which the gas inside the cylindrical hole 303 flows through the gap between the support column 301 and the double-cutting impact pin 202 according to the different positions of the double-cutting impact pin 202.

[0038] Furthermore, a wire interface 8 is fixedly provided on the inner wall of the upper housing 1, and the wire interface 8 is electrically connected to the trigger 201 through a wire.

[0039] It should be noted that after a system anomaly is detected, an input signal is sent to the wire interface 8. The wire interface 8 can transmit the electrical signal transmitted by the external wire to the trigger 201, causing the trigger 201 to operate and generate gas.

[0040] Furthermore, a plastic shell 6 is fixedly mounted on the surface of the single-phase copper busbar 5, and an isolation rib 10 is fixedly mounted on the surface of the plastic shell 6. A notch is opened in the middle of the plastic shell 6, and a double-cutting striker 202 is set at the notch in the middle of the plastic shell 6. The protrusion of the double-cutting striker 202 contacts the surface of the plastic shell 6.

[0041] It should be noted that the presence of the plastic shell 6 can insulate the single-phase copper busbar 5, and the insulating rib 10 is used to separate and increase the electrical clearance and creepage distance between the single-phase copper busbars 5, and one side of the insulating rib 10 protrudes from the surface of the plastic shell 6.

[0042] Furthermore, a lower housing 9 is provided below the plastic housing 6. The bottom end of each support column 301 is fixedly provided to the inner bottom wall of the lower housing 9. Two bolts 7 are provided inside the upper housing 1. Each bolt 7 passes through the upper housing 1, the plastic housing 6 and the lower housing 9 in sequence and extends into the interior of the lower housing 9. The surface of each bolt 7 is threaded onto the inner wall of the lower housing 9.

[0043] It should be noted that bolt 7 passes through the upper housing 1, the plastic housing 6, and the lower housing 9, enabling the installation and connection of the three.

[0044] Furthermore, the surfaces of the two single-phase copper busbars 5 below the double-cutting striker 202 are provided with weak breaks 204 of arbitrary shapes. Each single-phase copper busbar 5 has two mounting holes 11 on its surface. The mounting holes 11 can be used for threaded assembly or welding. The inner wall of the double-cutting striker 202 is fixedly provided with a placement part 304, and the arc extinguishing powder is placed inside the placement part 304.

[0045] It should be noted that the break 204 on the surface of the single-phase copper busbar 5 can accelerate the rate at which the double-cutting pin 202 cuts the single-phase copper busbar 5 and fix the position of the break.

[0046] Furthermore, two parallel fuses 4 are provided below the lower housing 9. Each parallel fuse 4 includes two connecting copper pieces. Each connecting copper piece penetrates the plastic housing 6 and extends into the interior of the plastic housing 6. Each connecting copper piece is fixedly mounted on the surface of the single-phase copper busbar 5.

[0047] It should be noted that the connecting copper sheet is first connected to the single-phase copper busbar 5 before being coated with plastic.

[0048] Furthermore, a placement component 304 is fixedly provided on the inner wall of the double-cutting striker 202, and the arc-extinguishing powder is placed inside the placement component 304.

[0049] It should be noted that the arc-extinguishing powder is placed inside the placement component 304, and the hole at the bottom of the placement component 304 can provide support for the arc-extinguishing powder. Only when the air pressure inside the double-cutting striker 202 increases can the arc-extinguishing powder be driven to break through the limitation of the hole at the bottom of the placement component 304.

[0050] It should be noted that two parallel fuses 4 are provided below the lower housing 9. The lower housing 9 covers the two parallel fuses 4. Each parallel fuse 4 includes two connecting copper pieces. Each connecting copper piece passes through the lower housing 9 and the plastic shell 6 in sequence and extends into the interior of the plastic shell 6. Each connecting copper piece is fixedly installed on the surface of the single-phase copper busbar 5. It should be noted that the lower housing 9 covers and encloses the parallel fuse 4 to achieve electrical isolation in a small area.

[0051] Working principle: The trigger 201 structure, along with the wire interface 8 structure mounted on the inner wall of the upper housing 1, allows for external signal wiring, stably transmitting electrical signals from the controller and fault acquisition module to the trigger 201 structure. The trigger 201 structure contains a built-in gas-generating agent, which, upon receiving an external fault signal, rapidly generates high-pressure driving gas within milliseconds. A large amount of gas instantly fills and elevates the trigger 201 structure, the upper housing 1 structure, the double-cutting striker 202 structure, and the sealing ring 203 structure. The immense pressure difference within the enclosed cavity continuously pushes the double-cutting striker 202 structure downwards at high speed, causing it to vertically impact the two single-phase copper busbars 5 positioned directly below it. Both single-phase copper busbars 5 are pre-machined with fracture surfaces 204, which significantly reduce the impact force required for busbar fracture and dramatically increase the instantaneous breaking rate of the double-cutting striker 202 structure, achieving simultaneous cutting of the two single-phase copper busbars 5. After the busbars fracture... The double-cutting striker 202 structure will continuously move downwards, forcibly widening the break gap and increasing the arc insulation resistance. This forces the fault circuit current to quickly switch to the parallel fuse 4 structure assembled at the bottom of the lower housing 9 structure, relying on the parallel fuse 4 structure to complete the final current limiting protection. In addition, after completely cutting off the single-phase copper busbar 5 structure, the double-cutting striker 202 structure will stably lock in the middle position between the two broken single-phase copper busbar 5 structures, forming a physical isolation barrier to prevent the high-temperature arcs at the break points from conducting to each other, thus preventing the cut single-phase copper busbar 5 structure from being short-circuited. High temperature and arc burning can cause warping, deformation, and reconnection of circuits, which pose safety hazards. Therefore, with the coordinated action of the whole set of cutting mechanism, it can not only completely solve a series of industry pain points of traditional three-phase electric drive high voltage circuit protection devices, such as slow breaking speed, inability to disconnect two circuits simultaneously, fixed and unadjustable protection action parameters, incompatibility between arc extinguishing structure and overall machine space layout, and poor reliability of short circuit fault protection, but also continuously provide limiting support for the single-phase copper busbar structure after cutting, maintain the stability of the break position and shape for a long time, and eliminate the risk of secondary short circuit. When the double-cutting striker 202 structure moves downward at high speed driven by the air pressure output from the trigger 201 structure, the two support columns 301 structures fixedly installed on the inner bottom wall of the lower housing 9 structure will gradually embed into the cylindrical hole 303 structure opened on the surface of the double-cutting striker 202 structure. As the support columns 301 structure continues to insert into the cylindrical hole 303 structure, it will continuously compress the closed air inside the cylindrical hole 303 structure. The compressed airflow will flow in both directions, and part of it will overflow outward from the fitting gap between the outer wall of the support column 301 structure and the inner wall of the cylindrical hole 303 structure. Another portion flows along the connecting channel into the two sets of jet holes 302 structures opened on the side of the double-cutting striker 202 structure. The high-pressure airflow will forcefully push the arc-extinguishing powder pre-placed inside the jet hole 302 structure and the placement component 304 structure outward at high speed. The powder evenly covers the arc area formed by the fracture of the single-phase copper busbar 5 structure, quickly cooling and extinguishing the fault arc, realizing active arc extinguishing protection; the upper part of the support column 301 structure is designed as a circular stepped structure that is narrow at the top and wide at the bottom. The outer diameter of the small circle at the top of the circular platform is smaller than the inner diameter of the cylindrical hole 303 structure, therefore the support... During the initial insertion of the support column 301 structure into the cylindrical hole 303 structure, a sufficient air gap is maintained between the outer wall of the support column 301 structure and the inner wall of the cylindrical hole 303 structure. Even if the airflow is squeezed outwards, it will not generate significant reverse resistance to offset the air pressure thrust, thus ensuring that the double-cutting striker 202 structure has sufficient downward impact kinetic energy to reliably break the single-phase copper busbar 5 structure. After the double-cutting striker 202 structure completes the copper busbar cutting action, the lower truncated cone of the upper half of the support column 301 structure will completely enter the interior of the cylindrical hole 303 structure. The outer diameter of the lower truncated cone in structure 301 and the inner diameter of the cylindrical hole in structure 303 are fitted with a gap. The ventilation gap between the two is greatly narrowed. The compressed air inside the cylindrical hole in structure 303 cannot be discharged quickly and instantaneously, forming a stable air damping effect. This continuously offsets the remaining downward impact kinetic energy of the double-cutting striker 202 structure, greatly reducing the impact force at the downward end of the double-cutting striker 202 structure. This reduces the impact noise, structural wear, and shell cracking risk caused by the hard collision between the bottom end of the double-cutting striker 202 structure and the bottom surface of the lower shell 9 structure, thus extending the service life of the entire machine. The lower half of each support column 301 structure is machined into a truncated cone structure, smaller at the top and larger at the bottom. The maximum outer diameter of the bottom end of the support column 301 structure is larger than the opening diameter of the cylindrical hole 303 structure. Simultaneously, a rubber buffer layer is covered at the upper opening of the cylindrical hole 303 structure. When the double-cutting striker 202 structure cuts the single-phase copper busbar 5 structure and continues to move downwards to its final stroke, the rubber buffer layer at the opening of the cylindrical hole 303 structure gradually adheres to and wraps around the conical outer wall of the support column 301 structure. The conical inclined surface of the support column 301 structure continuously compresses the rubber buffer layer, causing it to undergo elastic deformation. This rubber deformation process continuously absorbs the residue from the double-cutting striker 202 structure. The residual kinetic energy further weakens the downward impact of the striker; at the same time, the rubber buffer layer structure that undergoes compression deformation will closely adhere to the outer wall of the support column 301 structure, greatly increasing the static friction between the contact surface of the double-cut striker 202 structure and the support column 301 structure. Relying on the continuous frictional resistance, it offsets the upward rebound force generated by the compressed air rebound and arc thermal expansion of the double-cut striker 202 structure, firmly locking the double-cut striker 202 structure in the broken position, completely avoiding serious safety faults such as the re-connection of the single-phase copper busbar 5 structure break, arc reignition, and secondary conduction of the circuit caused by the rebound and retreat of the double-cut striker 202 structure, and stably maintaining the permanent disconnection state of the high-voltage circuit.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A split-type double-cut instantaneous circuit breaker, comprising an upper housing (1) and at least two single-phase copper busbars (5), characterized in that, The upper housing (1) is equipped with a cutting mechanism and a buffer mechanism. The cutting mechanism includes: A trigger (201) is fixedly disposed on the inner wall of the upper housing (1); A double-cutting striker (202) is disposed below the trigger (201). The surface of the double-cutting striker (202) is provided with an annular groove. The surface of the double-cutting striker (202) is integrally formed with two sets of protrusions, each set of protrusions having two protrusions. A sealing ring (203) is fitted into an annular groove on the surface of the double-cutting striker (202); After receiving an external signal, the trigger (201) generates gas, which accumulates in the sealed cavity between the trigger (201), the upper housing (1), the double-cutting striker (202) and the sealing ring (203). The increased pressure in the sealed cavity pushes the double-cutting striker (202) to cut off at least two single-phase copper busbars (5) below. The buffer mechanism includes: Two cylindrical holes (303) are opened on the surface of the double-cutting striker (202); Two sets of jet holes (302) are opened on the surface of the double-cutting striker (202). The internal cavity of each cylindrical hole (303) is connected to the internal cavity of the two jet holes (302) on the same side. Arc extinguishing powder is placed in the cavity of each jet hole (302). Two support columns (301) are provided below the cylindrical hole (303), and each support column (301) can be divided into an upper part and a lower part; The double-cutting striker (202) moves downward under pressure. After the support column (301) enters the cylindrical hole (303), it squeezes the gas sealed in the cylindrical hole (303). The squeezed gas drives the arc-extinguishing powder to be ejected through the jet hole (302). The upper part of the support column (301) is a circular truncated structure that is narrow at the top and wide at the bottom. The lower truncated structure of the upper part of the support column (301) can be fitted into the cylindrical hole (303) with a clearance fit. The frustum structure on the support column (301) can change the rate at which the gas inside the cylindrical hole (303) flows through the gap between the support column (301) and the double-cutting impact pin (202) according to the different positions of the double-cutting impact pin (202).

2. The split-type double-cut instantaneous circuit breaker according to claim 1, characterized in that, The lower half of each support column (301) is conical, and the diameter of the lower half of the support column (301) gradually increases from top to bottom. The diameter of the lowest part of the support column (301) is larger than the diameter of the cylindrical hole (303), and the opening of the cylindrical hole (303) is covered with a layer of rubber.

3. A split-type double-cut instantaneous circuit breaker according to claim 1, characterized in that, The inner wall of the upper housing (1) is fixedly provided with a wire interface (8), which is electrically connected to the trigger (201) through a wire.

4. A split-type double-cut instantaneous circuit breaker according to claim 1, characterized in that, A plastic shell (6) is fixedly provided on the surface of the single-phase copper busbar (5). An isolation rib (10) is fixedly provided on the surface of the plastic shell (6). A notch is provided in the middle part of the plastic shell (6). The double-cutting striker (202) is provided at the notch in the middle of the plastic shell (6). The protrusion of the double-cutting striker (202) is in contact with the surface of the plastic shell (6).

5. A split-type double-cut instantaneous interrupter according to claim 4, characterized in that, A lower shell (9) is provided below the plastic shell (6). The bottom end of each support column (301) is fixedly provided on the inner bottom wall of the lower shell (9). Two bolts (7) are provided inside the upper shell (1). Each bolt (7) passes through the upper shell (1), the plastic shell (6) and the lower shell (9) in sequence and extends into the interior of the lower shell (9). The surface of each bolt (7) is threaded onto the inner wall of the lower shell (9).

6. A split-type double-cut instantaneous circuit breaker according to claim 1, characterized in that, The surfaces of the two single-phase copper busbars (5) below the double-cutting striker (202) are provided with weak fractures (204) of arbitrary shapes. Each single-phase copper busbar (5) has two mounting holes (11) on its surface. The mounting holes (11) can be used for threaded assembly or welding. The inner wall of the double-cutting striker (202) is fixedly provided with a placement part (304), and the arc extinguishing powder is placed inside the placement part (304). The break (204) on the surface of the single-phase copper busbar (5) can accelerate the rate at which the double-cutting pin (202) cuts the single-phase copper busbar (5) and fix the position of the break.

7. A split-type double-cut instantaneous circuit breaker according to claim 5, characterized in that, Two parallel fuses (4) are provided below the lower housing (9). Each of the parallel fuses (4) includes two connecting copper pieces. Each connecting copper piece penetrates the plastic shell (6) and extends into the interior of the plastic shell (6). Each connecting copper piece is fixedly disposed on the surface of the single-phase copper busbar (5).

8. A split-type double-cut instantaneous interrupter according to claim 5, characterized in that, Two parallel fuses (4) are provided below the lower housing (9). The lower housing (9) covers the two parallel fuses (4). Each parallel fuse (4) includes two connecting copper pieces. Each connecting copper piece passes through the lower housing (9) and the plastic shell (6) in sequence and extends into the interior of the plastic shell (6). Each connecting copper piece is fixedly set on the surface of the single-phase copper busbar (5).

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