An explosive circuit breaker with arc extinguishing grid

Abstract

The present invention relates to an explosive circuit breaker with an arc extinguishing grid, comprising a shell, a base and a switching metal, the bottom of the shell is open, the base is connected to the open end of the bottom of the shell, the switching metal is clamped and fixed by the shell and the base, and a bursting assembly is arranged on the base; the shell and the switching metal together constitute an arc extinguishing cavity, the upper surface of the switching metal is provided with a first groove and a second groove, the switching metal between the first groove and the second groove is a swinging section, the position of the first groove corresponds to the position of the bursting assembly, and a middle seat is arranged in the arc extinguishing cavity; the middle seat includes an arc extinguishing part and an exhaust part, the bottom end of the arc extinguishing part is open, the arc extinguishing part is provided with a plurality of arc extinguishing grids, the plurality of arc extinguishing grids are spaced and distributed in parallel with each other, a gap for the swinging section to swing through is arranged between the bottom of the arc extinguishing grid and the switching metal, and the straight line where the length direction of the first groove is located is parallel to each arc extinguishing grid. The circuit breaker proposed by the present invention has the advantages of fast response speed, safety and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to an explosive circuit breaker with an arc extinguishing grid. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time. Circuit breakers can be used in various circuits to selectively interrupt current flowing out of or into energy storage devices. For example, a circuit breaker can be used to protect the battery pack of an electric vehicle.

[0003] At present, the domestic market generally uses fuse-type circuit breakers in the field of electric vehicles, which are blown by the control system to achieve the purpose of power-off protection. It has the following shortcomings:

[0004] (1) The fuse is slow and the response is not timely;

[0005] (ii) As OEMs are manufacturing models with higher power, longer range and faster charging, a higher voltage platform (800-1000VDC) is required, and the fuse circuit breaker will need to be larger and occupy more space;

[0006] (III) Insufficient security:

[0007] (1) Since the high-voltage circuit of the vehicle has a one-time pulse overload current, such as at the moment of circuit connection / disconnection, which usually lasts for a short time, with the frequent use of the vehicle, the pulse current will in many cases occur thousands of times during the entire service life of the device, causing premature fatigue damage to the fuse. Even under normal operating conditions, the fuse may break at certain moments;

[0008] (2) When an electric vehicle is involved in an accidental collision, the high-voltage components of the metal shell are very easy to be squeezed and deformed. When the deformed metal shell of the electric component comes into contact with the high-voltage copper busbar, it may cause a short circuit, fire, or electric shock to personnel;

[0009] Currently, two solutions are usually adopted to solve the above problem (2):

[0010] Solution 1: After a car collision, the collision sensor sends a collision signal to the electronic control unit responsible for controlling the high-voltage contactor. After receiving the collision command, the electronic control unit sends a power-off signal to the high-voltage distribution system to cut off the high-voltage circuit by disconnecting the contactor. However, Solution 1 also has two risks: a. The danger has occurred before the electronic control unit reacts; b. During a vehicle collision, the intelligent judgment system cannot complete the entire logical judgment and power-off action due to damage to the signal line or power line.

[0011] Option 2: Add a fuse to the vehicle power circuit, hoping that the high-voltage circuit fuse will be disconnected when a short circuit occurs after a collision. The risk of this option is that when an incomplete short circuit occurs, the collision causes the high-voltage positive and negative poles to be connected to an equivalent heating impedance. Within the current range allowed by the fuse, local heating will cause a fire in the entire vehicle. Summary of the invention

[0012] 1. Technical issues to be resolved

[0013] In view of the deficiencies in the prior art, the present invention provides an explosive circuit breaker with an arc extinguishing grid to solve one or more problems in the prior art.

[0014] (II) Technical solution

[0015] To achieve the above object, the technical solution of the present invention is as follows:

[0016] An explosive circuit breaker with an arc extinguishing grid comprises a shell, a base and a switching metal, wherein the bottom of the shell is open, the base is connected to the open end of the bottom of the shell, the switching metal is clamped and fixed by the shell and the base, and an explosive assembly is arranged on the base;

[0017] The shell and the switching metal together constitute an arc extinguishing chamber, the switching metal is provided with a first groove and a second groove, the switching metal between the first groove and the second groove is a swinging section, the position of the first groove corresponds to the position of the blasting assembly, and a middle seat is provided in the arc extinguishing chamber; the middle seat includes an arc extinguishing part and an exhaust part, the bottom end of the arc extinguishing part is open, and the arc extinguishing part is provided with a plurality of arc extinguishing grids, and the plurality of arc extinguishing grids are spaced and distributed in parallel with each other, and a gap for the swinging section to swing through is provided between the bottom of the arc extinguishing grid and the switching metal, and the straight line where the length direction of the first groove is located is parallel to each arc extinguishing grid.

[0018] Furthermore, one first groove is provided, and two second grooves are provided, the first groove is located between two second grooves, and the first groove and the second groove are both located in the arc extinguishing cavity; the blasting assembly includes a blasting cavity, a fixing ring and an ignition tool, the blasting cavity is opened on the upper surface of the base, the ignition tool and the fixing ring are both arranged in the blasting cavity, the ignition tool includes a blasting end and an ignition end, the blasting end is inserted in the fixing ring, the position of the blasting end corresponds to the position of the first groove, the top of the fixing ring is in conflict with the on-off metal, the on-off metal presses the ignition tool in the blasting cavity by squeezing the fixing ring, a gap is provided between the blasting end and the on-off metal, an ignition fuel is provided inside the blasting end, and the ignition end is electrically connected to the control system of the circuit in which the circuit device is located through a wire.

[0019] Furthermore, after the arc extinguishing grids are arranged and distributed, a bottom connection line is in an arc shape, and the vertex of the arc corresponds to the position of the first slot.

[0020] Furthermore, an arc extinguishing cutout is provided at the bottom of the arc extinguishing grid, and the arc extinguishing cutout includes a U-shaped cutout and a V-shaped cutout, and the V-shaped cutout is located at the top end of the U-shaped cutout.

[0021] Furthermore, the inner wall of the shell located above the arc extinguishing grid is provided with a gas-guiding arc surface, and the gas-guiding arc surface is provided with two connected gas-guiding arc surfaces, the position of the connecting line of the two gas-guiding arc surfaces corresponds to the first groove, and the height of one end of the two gas-guiding arc surfaces away from each other is higher than the height of the connecting end.

[0022] Furthermore, one arc extinguishing part is provided, and two exhaust parts are provided, the arc extinguishing part is located between the two exhaust parts, a plurality of pressure relief channels are provided on one side of the exhaust part close to the inner wall of the shell, the pressure relief channels are divided by a plurality of partitions arranged on the exhaust part and evenly distributed at intervals, one end of the pressure relief channel is connected to the area above the arc extinguishing grid, and a plurality of pressure relief holes are opened on the shell at positions corresponding to the pressure relief channels.

[0023] Furthermore, filter cotton is arranged at a position of the inner wall of the shell corresponding to the pressure relief channel, and the filter cotton covers all the pressure relief holes.

[0024] Furthermore, a diverter plate is provided in each of the pressure relief channels. The diverter plate is provided in parallel with the partition plate, and the diverter plate is provided at the center position of two adjacent partition plates.

[0025] Furthermore, two groups of protection components are provided on the inner wall of the bottom opening of the arc extinguishing part, and the protection components include two limit blocks and two blocking plates; the two limit blocks are respectively located on the two vertical inner walls of the bottom opening of the arc extinguishing part and perpendicular to the first groove, and the spacing between the two limit blocks is 1-2mm smaller than the width of the corresponding part of the swinging section, and the two limit blocks are used to clamp the swinging section that swings after the explosion; the two blocking plates are arranged vertically and parallel to each other, and the blocking plates are arranged on the vertical inner wall of the bottom opening of the arc extinguishing part and parallel to the first groove, and the blocking plates are used to prevent the swinging section that swings after the explosion from colliding with the middle seat; the two groups of protection components are respectively used to protect the two swinging sections that switch on and off the metal after the explosion.

[0026] Furthermore, the distance between the two second slots is not less than the minimum safety isolation distance of the circuit voltage in which the circuit breaker is located.

[0027] (III) Beneficial technical effects

[0028] In summary, the present invention includes at least one of the following beneficial technical effects:

[0029] 1. When in use, the blasting assembly explodes first, breaking the switching metal from the position of the first slot, thereby achieving the purpose of cutting off the current, and then under the impact of the explosion, the two swinging segments will rotate upward around the position of the second slot and enter the arc extinguishing chamber. As the two swinging segments rotate away from each other, the arc generated at the break of the switching metal will be stretched by the two swinging segments, and because the explosion generates a vertical upward shock wave, the arc will be blown into an arc shape and move upward to the position of the arc extinguishing grid and cut into segments by the arc extinguishing grid, thereby achieving the purpose of arc extinguishing; among them, since the blasting assembly, the arc generation position and the arc extinguishing grid are located on the same vertical line, the arc will be immediately blown into the arc extinguishing grid after it is generated to complete the arc extinguishing, thereby preventing the arc from leaking out, and has the advantages of fast response, efficient and rapid arc extinguishing, safety, stability and reliability;

[0030] 2. Since the blasting assembly includes a blasting chamber, a fixing ring and an igniter, the blasting chamber is provided on the upper surface of the base, the igniter and the fixing ring are both arranged in the blasting chamber, the igniter includes a blasting end and an ignition end, the blasting end is inserted in the fixing ring, the position of the blasting end corresponds to the position of the first slot, the top of the fixing ring contacts the on-off metal, the on-off metal presses and fixes the igniter in the blasting chamber by squeezing the fixing ring, a gap is provided between the blasting end and the on-off metal, an ignition fuel is provided inside the blasting end, and the ignition end is electrically connected to the control system of the circuit in which the circuit device is located through a wire; therefore, when a danger occurs, the control system transmits a signal to the ignition end of the igniter, causing the blasting end of the igniter to explode, and the impact generated by the explosion will directly act on the position of the first slot, thereby facilitating the on-off metal to quickly disconnect from the first slot to cut off the circuit, and at the same time, the high-pressure gas generated by the explosion will impact upward into the arc extinguishing chamber, blowing the arc generated at the fracture of the on-off metal to the arc extinguishing grid to achieve arc extinguishing, which has the advantages of rapid response and efficient arc extinguishing;

[0031] 3. Since the bottom connection line of multiple arc extinguishing grids is arc-shaped after being arranged and distributed, and the vertex of the arc corresponds to the position of the first slot, after the explosion occurs, the arc generated at the break of the switching metal will also form an arc under the stretching of the two swinging sections and the impact of the explosion gas, so it is convenient for the arc extinguishing grid to synchronously extinguish the arc at each position of the arc, thereby improving the arc extinguishing efficiency and arc extinguishing effect;

[0032] 4. Since the arc extinguishing grid is provided with an arc extinguishing cutout at the bottom, the arc extinguishing cutout includes a U-shaped cutout and a V-shaped cutout, and the V-shaped cutout is located at the top of the U-shaped cutout, the arc can be cut off again after being cut off, thereby achieving the purpose of rapid extinguishing and discharge;

[0033] 5. Since the inner wall of the shell above the arc extinguishing grid is provided with a gas guiding arc surface, the gas guiding arc surface is provided with two connected gas guiding arc surfaces, the position of the connecting line of the two gas guiding arc surfaces corresponds to the first groove, and the height of the ends of the two gas guiding arc surfaces away from each other is higher than the height of the connecting end. Through the above arrangement, the high-pressure gas generated by the explosion will contact the gas guiding arc surface after passing through the arc extinguishing grid, and the gas guiding arc surface will guide the high-pressure gas to two opposite directions respectively, thereby reducing the impact of the high-pressure gas on the top surface of the shell, and achieving the effect of pressure relief and protection;

[0034] 6. Since a plurality of pressure relief channels are arranged on one side of the exhaust part of the middle seat close to the inner wall of the shell, the pressure relief channels are divided by a plurality of partitions arranged on the exhaust part and evenly spaced, one end of the pressure relief channel is connected to the area above the arc extinguishing grid, and a plurality of pressure relief holes are opened on the shell at positions corresponding to the pressure relief channels; through the above arrangement, the gas guide arc surface can respectively guide the high-pressure gas into the pressure relief channels of the two exhaust parts of the middle seat, and since a plurality of pressure relief channels are arranged, the high-pressure gas can be diverted to achieve a pressure relief effect, and after the high-pressure gas enters the pressure relief channel, it can finally be discharged from the shell through the pressure relief holes;

[0035] 7. Since filter cotton is arranged at the position of the pressure relief channel corresponding to the inner wall of the shell, and the filter cotton covers all the pressure relief holes, the filter cotton can prevent the fine particles generated by the explosion from flying out of the shell from the pressure relief holes;

[0036] 8. Since each pressure relief channel is provided with a diverter plate, the diverter plate is arranged in parallel with the partition plate, and the diverter plate is arranged at the center of two adjacent partition plates, the diverter plate can cut the gas in the pressure relief channel into smaller airflows, further improving the pressure relief effect;

[0037] 9. Since two groups of protection components are arranged on the inner wall of the bottom opening of the arc extinguishing part, the protection components include two limit blocks and two blocking plates; the two limit blocks are respectively located on the two vertical inner walls of the bottom opening of the arc extinguishing part and perpendicular to the first groove, the spacing between the two limit blocks is 1-2mm smaller than the width of the corresponding part of the swinging section, and the two limit blocks are used to clamp the swinging section that swings after the explosion; the two blocking plates are arranged vertically and parallel to each other, and the blocking plates are arranged on the vertical inner walls of the bottom opening of the arc extinguishing part and parallel to the first groove, and the blocking plates are used to prevent the swinging section that swings after the explosion from colliding with the middle seat; through the above arrangement, after the explosion, the two swinging sections will be driven to the positions of the limit blocks corresponding to each other, and under the impact of the explosion, the swinging sections will be clamped by the two relatively arranged limit blocks or pass through between the two relatively arranged limit blocks, thereby avoiding the accidental contact of the two swinging sections after the swinging back and causing danger; in addition, the arrangement of the blocking plates can prevent the swinging sections from rotating too much and colliding with the middle seat, thereby protecting the middle seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the overall structure of an explosive circuit breaker with an arc extinguishing grid in an embodiment;

[0040] Figure 2 A vertical cross-sectional view of an explosive circuit breaker with an arc extinguishing grid in an embodiment;

[0041] Figure 3 The structural intention of the arc extinguishing grid in the embodiment;

[0042] Figure 4 Schematic diagram of the positional relationship between the switching metal and the arc extinguishing grid in the embodiment;

[0043] Figure 5 Schematic diagram of the positional relationship between the switching metal after the metal is ruptured by explosion and the arc extinguishing grid in the embodiment;

[0044] Figure 6 It is a schematic diagram of the structure in which the middle seat and the arc extinguishing grid are connected in the embodiment;

[0045] Figure 7 It is a structural schematic diagram for reflecting the pressure relief channel;

[0046] Figure 8 A top view of the middle seat in the embodiment;

[0047] Fig. 9 It is a bottom view of the center seat in the embodiment.

[0048] Description of reference numerals:

[0049] In the figure, 1, shell; 2, base; 3, switch metal; 4, blasting chamber; 5, fixing ring; 6, ignition tool; 61, blasting end; 62, ignition end; 7, arc extinguishing chamber; 8, first groove; 9, second groove; 10, swing section; 11, middle seat; 111, arc extinguishing part; 112, exhaust part; 12, arc extinguishing grid; 13, arc extinguishing incision; 131, U-shaped incision; 132, V-shaped incision; 14, air guide arc surface; 15, pressure relief channel; 16, partition; 17, pressure relief hole; 18, filter cotton; 19, diverter plate; 20, limit block; 21, baffle plate; 22, slot. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0053] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0054] In addition, the term "plurality" shall mean two or more.

[0055] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0056] Example:

[0057] Reference Figure 1-9, is an explosion-type circuit breaker with an arc extinguishing grid disclosed in the present invention, comprising a housing 1, a base 2 and a switching metal 3. The bottom of the housing 1 is open, the base 2 is connected to the open end of the bottom of the housing 1 by bolts, the switching metal 3 is clamped and fixed by the housing 1 and the base 2, and an explosion assembly is arranged on the base 2.

[0058] The shell 1 and the switching metal 3 together constitute an arc extinguishing chamber 7. A first groove 8 and two second grooves 9 are arranged on the upper surface of the switching metal 3. The first groove 8 and the second groove 9 are both located in the arc extinguishing chamber 7. The first groove 8 is located at the midpoint of the two second grooves 9 and at the midpoint of the entire length direction of the switching metal 3. The portion of the switching metal 3 between the first groove 8 and the second groove 9 is a swinging section 10. The position of the first groove 8 corresponds to the position of the blasting assembly. A middle seat 11 is arranged in the arc extinguishing chamber 7, and the middle seat 11 is clamped and fixed by the switching metal 3 and the shell 1.

[0059] The middle seat 11 comprises an arc extinguishing portion 111 and two exhaust portions 112. The arc extinguishing portion 111 is arranged between the two exhaust portions 112. The bottom end of the arc extinguishing portion 111 is open. The arc extinguishing portion 111 is provided with a plurality of arc extinguishing grids 12. The arc extinguishing portion 111 is provided with a plurality of clamping grooves 22. The arc extinguishing grids 12 are clamped and fixed with the arc extinguishing portion 111 through the clamping grooves 22. The plurality of arc extinguishing grids 12 are parallel to each other and evenly spaced. The first groove 8 and the second groove 9 are both located below the arc extinguishing grid 12. A gap is provided between the bottom of the arc extinguishing grid 12 and the switching metal 3 for the swing section 10 to swing through. The straight line where the length direction of the first groove (8) is located is parallel to each arc extinguishing grid (12).

[0060] The blasting assembly includes a blasting chamber 4, a fixing ring 5 and an igniter 6. The blasting chamber 4 is opened on the upper surface of the base 2, and the igniter 6 and the fixing ring 5 are both arranged in the blasting chamber 4. The igniter 6 includes a blasting end 61 and an ignition end 62. The blasting end 61 is provided with an ignition fuel inside. The ignition fuel mainly includes but is not limited to the following components: zirconium powder, potassium perchlorate, fluororubber, sodium methyl cellulose, aluminum powder, etc. The blasting end 61 is inserted into the fixing ring 5, and the position of the blasting end 61 corresponds to the position of the first groove 8. The top of the fixing ring 5 is in conflict with the switch metal 3, and the switch metal 3 is pressed and fixed in the blasting chamber 4 by squeezing the fixing ring 5. A gap is set between the blasting end 61 and the switch metal 3 to prevent the explosion from directly destroying the switch metal 3. The ignition end 62 is electrically connected to the control system of the circuit in which the circuit device is located through a wire.

[0061] When the circuit breaker proposed in this embodiment is applied to an electric vehicle, the switch metal 3 is connected to the circuit of the electric vehicle, the ignition end 62 of the ignition device 6 is connected to the electric control system of the electric vehicle, and a trigger condition is set in the electric control system of the electric vehicle, such as collision, high temperature, overload, etc. When the above accident occurs, the electric control system transmits a signal to the ignition device 6 to detonate the ignition device 6, and the switch metal 3 can be blown off from the position of the first slot 8, thereby achieving the purpose of cutting off the current. Then, under the impact of the explosion, the two swing segments 10 will rotate upward around the position of the second slot 9 and enter the arc extinguishing chamber 7. As the two swing segments 10 rotate upward around the position of the second slot 9, the arc extinguishing chamber 7 will be opened. The swinging sections 10 rotate in directions away from each other, and the arc generated at the fracture of the switching metal 3 will be stretched by the two swinging sections 10. Since the explosion generates a vertically upward shock wave, the arc will be blown into an arc shape and move upward to the position of the arc extinguishing grid 12 and cut into segments by the arc extinguishing grid 12, thereby achieving the purpose of arc extinguishing. Among them, since the blasting component, the arc generation position and the arc extinguishing grid 12 are located on the same vertical line, the arc will be immediately blown into the arc extinguishing grid 12 after it is generated to complete the arc extinguishing, thereby preventing the arc from leaking out. Therefore, the circuit breaker proposed in this embodiment has the advantages of rapid response, safety, stability and reliability.

[0062] In order to ensure the safety of the entire circuit after the on-off metal 3 is disconnected and exploded, the distance between the two second slots 9 is not less than the minimum safe isolation distance of the circuit voltage of the circuit breaker. In this embodiment, the distance between the two second slots 9 is not less than the minimum safe isolation distance of the circuit voltage of the electric vehicle.

[0063] In addition, after the multiple arc extinguishing grids 12 are arranged and distributed, the bottom connection line is arc-shaped, and the vertex of the arc corresponds to the position of the first slot 8. Through the above arrangement, after the explosion occurs, the arc generated at the break of the switching metal 3 will also form an arc (such as Figure 5 The arc extinguishing grid 12 is convenient for synchronously extinguishing arcs at various positions of the arc-shaped electric arc, thereby improving the arc extinguishing efficiency and arc extinguishing effect.

[0064] The arc extinguishing grid 12 is provided with an arc extinguishing notch 13 at the bottom thereof, and the arc extinguishing notch 13 includes a U-shaped notch 131 and a V-shaped notch 132, and the V-shaped notch 132 is located at the top of the U-shaped notch 131. Through the above arrangement, the arc can be cut off again after being cut off, thereby achieving the purpose of rapid extinguishing and discharge. Here, the edge of the opening end of the U-shaped notch 131 and the bottom edge of the arc extinguishing grid 12 are arranged in a sharp angle shape, so as to form a tip discharge, which is conducive to rapid arc extinguishing.

[0065] Furthermore, the inner wall of the shell 1 located above the arc extinguishing grid 12 is provided with a gas guiding arc surface 14, and the gas guiding arc surface 14 is provided with two connected gas guiding arc surfaces, and the position of the connecting line of the two gas guiding arc surfaces 14 corresponds to the first groove 8, and the height of the ends of the two gas guiding arc surfaces 14 that are away from each other is higher than the height of the connecting end. Through the above arrangement, after the high-pressure gas generated by the explosion passes through the arc extinguishing grid 12, it will contact the gas guiding arc surface 14, and the gas guiding arc surface 14 will guide the high-pressure gas to two opposite directions respectively, thereby reducing the impact of the high-pressure gas on the top surface of the shell 1, achieving the effect of pressure relief and protection, and the gas guiding arc surface 14 will guide the high-pressure gas to the exhaust part 112 of the middle seat 11, thereby relieving and exhausting the high-pressure gas.

[0066] A plurality of pressure relief channels 15 are provided on one side of the exhaust portion 112 of the middle seat 11 close to the inner wall of the housing 1. The pressure relief channels 15 are separated by a plurality of partitions 16 arranged on the exhaust portion 112 and evenly spaced. One end of the pressure relief channel 15 is connected to the area above the arc extinguishing grid 12. A plurality of pressure relief holes 17 are provided on the housing 1 at positions corresponding to the pressure relief channels 15. Through the above arrangement, the gas guide arc surface 14 can respectively guide the high-pressure gas into the pressure relief channels 15 of the two exhaust portions 112 of the middle seat 11. Since a plurality of pressure relief channels 15 are provided, the high-pressure gas can be diverted to achieve a pressure relief effect. After the high-pressure gas enters the pressure relief channel 15, it can eventually be discharged from the housing 1 through the pressure relief holes 17.

[0067] Furthermore, a diverter plate 19 is provided in each pressure relief channel 15. The diverter plate 19 is arranged parallel to the partition 16. The diverter plate 19 is arranged at the center position of two adjacent partitions 16. Therefore, the diverter plate 19 can cut the gas in the pressure relief channel 15 into finer airflows, further improving the pressure relief effect.

[0068] In addition, filter cotton 18 is arranged at the position of the inner wall of the shell 1 corresponding to the pressure relief channel 15, and the filter cotton 18 completely covers all the pressure relief holes 17. The filter cotton 18 is a new type of inorganic insulating refractory material, including but not limited to aluminum caron fiber, produced using special textile technology and equipment, and its physical and chemical properties can be restored to their original state after drying. Through the above arrangement, the filter cotton 18 can prevent fine particles generated by the explosion from flying out of the shell 1 from the pressure relief hole 17.

[0069] Finally, two groups of protection components are provided on the inner wall of the bottom opening of the arc extinguishing part 111. The protection components include two limit blocks 20 and two blocking plates 21. The two limit blocks 20 are respectively located on the two vertical inner walls of the bottom opening of the arc extinguishing part 111 and perpendicular to the first slot 8. The limit blocks 20 are plastic blocks with certain elasticity and hardness. The spacing between the two limit blocks 20 is 1-2mm smaller than the width of the corresponding part of the swing section 10. The two limit blocks 20 are used to clamp the swing section 10 that swings after the explosion. The two blocking plates 21 are arranged vertically and parallel to each other. The blocking plates 21 are arranged on the vertical inner wall of the bottom opening of the arc extinguishing part 111 and parallel to the first slot 8. The blocking plates 21 are used to prevent the swing section 10 that swings after the explosion from colliding with the middle seat 11; the two groups of protection components are respectively used to protect the two swing sections 10 of the metal 3 that are switched on and off after the explosion.

[0070] Through the above arrangement, after the explosion occurs, the two swinging sections 10 will be driven to the positions of the respective corresponding limit blocks 20, and under the impact of the explosion, the swinging sections 10 will be stuck by the two oppositely arranged limit blocks 20 or pass through the two oppositely arranged limit blocks 20, thereby preventing the two swinging sections 10 from accidentally contacting each other after swinging back and causing danger. In addition, the setting of the blocking plate 21 can prevent the swinging section 10 from rotating too much and colliding with the middle seat 11, thereby protecting the middle seat 11.

[0071] The working principle of this embodiment is as follows: when the blasting assembly receives a signal to explode, the switch metal 3 can be blown off from the position of the first slot 8, thereby achieving the purpose of cutting off the current, and then under the impact of the explosion, the two swinging segments 10 will rotate upward around the position of the second slot 9 and enter the arc extinguishing chamber 7. As the two swinging segments 10 rotate away from each other, the arc generated at the break of the switch metal 3 will be stretched by the two swinging segments 10, and since the explosion generates a vertically upward shock wave, the arc will be blown into an arc shape and move upward to the position of the arc extinguishing grid 12 and cut into segments by the arc extinguishing grid 12, thereby achieving the purpose of arc extinguishing, and the high-pressure gas generated by the explosion can be discharged from the shell 1 through the pressure relief hole 17; wherein, since the blasting assembly, the arc generation position and the arc extinguishing grid 12 are located on the same vertical line, the arc will be immediately blown into the arc extinguishing grid 12 after it is generated to complete the arc extinguishing, thereby preventing the arc from leaking out, so the circuit breaker proposed in this embodiment has the advantages of rapid response, safety, stability and reliability.

[0072] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An explosive circuit breaker with an arc extinguishing grid, Features: The device comprises a shell (1), a base (2) and a switching metal (3); the shell (1) has an opening at the bottom, the base (2) is connected to the opening end of the bottom of the shell (1), the switching metal (3) is clamped and fixed by the shell (1) and the base (2), and a blasting assembly is arranged on the base (2); The shell (1) and the switching metal (3) together form an arc extinguishing chamber (7); the switching metal (3) is provided with a first groove (8) and a second groove (9); the first groove (8) is provided with one, the second groove (9) is provided with two, the first groove (8) is located between the two second grooves (9), the first groove (8) and the second groove (9) are both located in the arc extinguishing chamber (7); the switching metal (3) between the first groove (8) and the second groove (9) is a swing section (10); the position of the first groove (8) is consistent with the position of the blasting component Corresponding to the arrangement, a middle seat (11) is arranged in the arc extinguishing cavity (7); the middle seat (11) comprises an arc extinguishing portion (111) and an exhaust portion (112); the bottom end of the arc extinguishing portion (111) is open; the arc extinguishing portion (111) is provided with a plurality of arc extinguishing grids (12); the plurality of arc extinguishing grids (12) are arranged in parallel and spaced apart from each other; a space for the swing section (10) to swing through is arranged between the bottom of the arc extinguishing grid (12) and the switching metal (3); and the straight line on which the length direction of the first slot (8) is located is parallel to each arc extinguishing grid (12); Two groups of protection components are arranged on the inner wall of the bottom opening of the arc extinguishing part (111), and the protection components include two limit blocks (20) and two blocking plates (21); the two limit blocks (20) are respectively located on two vertical inner walls of the bottom opening of the arc extinguishing part (111) and perpendicular to the first groove (8); the spacing between the two limit blocks (20) is 1-2 mm smaller than the width of the corresponding part of the swing section (10); the two limit blocks (20) are used to clamp the swing section (10) that swings after the explosion; the two blocking plates (21) are arranged vertically and parallel to each other, and the blocking plates (21) are arranged on the vertical inner wall of the bottom opening of the arc extinguishing part (111) and parallel to the first groove (8); the blocking plates (21) are used to prevent the swing section (10) that swings after the explosion from colliding with the middle seat (11); the two groups of protection components are respectively used to protect the two swing sections (10) that switch on and off the metal (3) after the explosion occurs.

2. An explosive circuit breaker with an arc extinguishing grid according to claim 1, Features The blasting assembly comprises a blasting chamber (4), a fixing ring (5) and an igniter (6); the blasting chamber (4) is provided on the upper surface of the base (2); the igniter (6) and the fixing ring (5) are both arranged in the blasting chamber (4); the igniter (6) comprises a blasting end (61) and an ignition end (62); the blasting end (61) is inserted in the fixing ring (5); the position of the blasting end (61) corresponds to the position of the first groove (8); the top of the fixing ring (5) contacts the on-off metal (3); the on-off metal (3) presses and fixes the igniter (6) in the blasting chamber (4) by squeezing the fixing ring (5); a gap is arranged between the blasting end (61) and the on-off metal (3); an ignition fuel is arranged inside the blasting end (61); and the ignition end (62) is electrically connected to a control system of a circuit in which the circuit device is located through a wire.

3. An explosive circuit breaker with an arc extinguishing grid according to claim 2, Features: After the plurality of arc extinguishing grids (12) are arranged and distributed, the bottom connection line is in an arc shape, and the vertex of the arc corresponds to the position of the first groove (8).

4. An explosive circuit breaker with an arc extinguishing grid according to claim 3, Features: An arc extinguishing cutout (13) is provided at the bottom of the arc extinguishing grid (12), wherein the arc extinguishing cutout (13) comprises a U-shaped cutout (131) and a V-shaped cutout (132), wherein the V-shaped cutout (132) is located at the top end of the U-shaped cutout (131).

5. An explosive circuit breaker with an arc extinguishing grid according to claim 1, Features: The inner wall of the shell (1) located above the arc extinguishing grid (12) is provided with a gas guiding arc surface (14), and the gas guiding arc surface (14) is provided with two connected gas guiding arc surfaces, the position of the connecting line of the two gas guiding arc surfaces (14) corresponds to the first groove (8), and the height of the ends of the two gas guiding arc surfaces (14) that are away from each other is higher than the height of the connecting end.

6. An explosive circuit breaker with an arc extinguishing grid according to claim 5, Features: One arc extinguishing portion (111) is provided, and two exhaust portions (112) are provided. The arc extinguishing portion (111) is located between the two exhaust portions (112). A plurality of pressure relief channels (15) are provided on one side of the exhaust portion (112) close to the inner wall of the shell (1). The pressure relief channels (15) are divided by a plurality of partitions (16) arranged on the exhaust portion (112) and evenly distributed at intervals. One end of the pressure relief channel (15) is connected to the area above the arc extinguishing grid (12). A plurality of pressure relief holes (17) are provided on the shell (1) at positions corresponding to the pressure relief channels (15).

7. An explosive circuit breaker with an arc extinguishing grid according to claim 6, Features: A filter cotton (18) is arranged at a position of the inner wall of the housing (1) corresponding to the pressure relief channel (15), and the filter cotton (18) completely covers all the pressure relief holes (17).

8. An explosive circuit breaker with an arc extinguishing grid according to claim 6, Features: A flow divider plate (19) is arranged in each of the pressure relief channels (15); the flow divider plate (19) is arranged in parallel with the partition plate (16); and the flow divider plate (19) is arranged at the center position of two adjacent partition plates (16).

9. An explosive circuit breaker with an arc extinguishing grid according to claim 1, Features: The distance between the two second slots (9) is not less than the minimum safety isolation distance of the circuit voltage in which the circuit breaker is located.

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