Blasting circuit breaker

Abstract

The utility model discloses a blasting circuit breaker. A protective housing is provided with an inner cavity; the conductive bridge penetrates through the protective shell and divides an inner cavity of the protective shell into a first cavity and a second cavity, two deflection grooves and a disconnection groove located between the two deflection grooves are formed in the conductive bridge, and the section, located between each deflection groove and the disconnection groove, of the conductive bridge is a deflection section; the igniter inserted into the first chamber explodes after being electrified and can explode and break the breaking grooves, and meanwhile, the two deflection sections are made to deflect towards the second chamber by taking the two deflection grooves as rotating parts respectively; the arc extinguishing structure is provided with a first arc extinguishing structure and a second arc extinguishing structure, the first arc extinguishing structure can extinguish electric arcs generated between the two deflection sections, and the second arc extinguishing structure can be exploded into fine particles under the explosion effect of the igniter so as to extinguish the electric arcs generated between the two deflection sections. The explosion circuit breaker is timely in response and rapid and efficient in arc extinguishing, can be applied to high-precision products, and improves the working safety and reliability of a circuit system.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, in particular to a blasting circuit breaker. Background Art

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

[0003] Regarding circuit breakers, the most widely used type in the current market is the fuse-type circuit breaker, which is made to fuse through a control system to achieve the purpose of power-off protection. However, the fuse-type circuit breaker has the following deficiencies in application: 1) When cutting a conductive copper bar in a high-voltage environment, an electric arc will be generated at the moment of cutting. At this time, the electric arc cannot contact the arc extinguishing grid in time, that is, rapid and effective arc extinguishing cannot be carried out, thus the working safety and reliability of the circuit system cannot be effectively guaranteed. 2) The fusing speed of the fuse-type circuit breaker is relatively slow, resulting in untimely response and it cannot be well applied to high-precision products.

[0004] In view of this, the present utility model is specifically proposed. Summary of the Invention

[0005] In order to overcome the above defects, the present utility model provides a blasting circuit breaker, which has timely response and rapid and efficient arc extinguishing. It can not only be well applied to high-precision products, but also greatly improve the working safety and reliability of the circuit protection device and even the entire circuit system.

[0006] The technical solution adopted by the present utility model to solve its technical problems is: a blasting circuit breaker, comprising:

[0007] A protective housing provided with an inner cavity;

[0008] A conductive electric bridge passing through the protective housing and dividing the inner cavity of the protective housing into a first chamber and a second chamber; two spaced-apart deflection grooves and a disconnection groove located between the two deflection grooves are provided on the part of the conductive electric bridge located in the inner cavity, and the section of the conductive electric bridge located between each deflection groove and the disconnection groove is a deflection section;

[0009] An igniter inserted into the first chamber and close to the disconnection groove; after the igniter is energized and explodes, it can blow open the disconnection groove, and at the same time, the two deflection sections respectively deflect towards the second chamber with the two deflection grooves as the rotation parts;

[0010] An arc extinguishing structure, which is provided with a first arc extinguishing structure built in the second chamber and a second arc extinguishing structure built in the first chamber; the first arc extinguishing structure can extinguish the arc generated between the two deflection segments, and the second arc extinguishing structure can burst into fine particles under the explosion of the igniter to achieve arc extinguishing for the arc generated between the two deflection segments.

[0011] As a further improvement of the present utility model, the second arc extinguishing structure is an annular structure cast from quartz sand or insulating resin material, and is positioned and installed in the first chamber and surrounds the igniter.

[0012] As a further improvement of the present utility model, it is defined that the first chamber is located above the second chamber; the first arc extinguishing structure is a block structure made of ceramic or insulating resin material and is positioned on the bottom wall of the second chamber.

[0013] As a further improvement of the present utility model, the first arc extinguishing structure is provided with a plurality of heat dissipation through holes respectively penetrating its upper and lower surfaces.

[0014] As a further improvement of the present utility model, based on the state where the igniter is not powered on, the downward projections of the two deflection grooves both completely or partially fall on the upper surface of the first arc extinguishing structure;

[0015] In addition, the upper surface of the first arc extinguishing structure is a concave arc surface.

[0016] As a further improvement of the present utility model, the igniter adopts a medicine cup type igniter, and the bridge wire in the igniter is made of platinum-tungsten alloy material.

[0017] As a further improvement of the present utility model, the conductive electric bridge is strip-shaped, and the two deflection grooves are arranged in parallel along the length direction of the conductive electric bridge, and the disconnection groove is centered between the two deflection grooves;

[0018] In addition, it is defined that the first chamber is located above the second chamber; the vertical cross-section of the deflection groove is any one of U-shaped, arc-shaped, V-shaped, ︹-shaped and ︺-shaped, and the vertical cross-section of the disconnection groove is any one of V-shaped, ︹-shaped and ︺-shaped.

[0019] As a further improvement of the present utility model, a groove for placing one end of the igniter is also recessed at a position on the conductive electric bridge and between the two deflection grooves, and the groove is communicated with the disconnection groove.

[0020] As a further improvement of the present utility model, a punching and shearing head is fixedly sleeved outside the igniter, and the punching and shearing head presses against the disconnection groove.

[0021] As a further improvement of the present utility model, a pressure relief chamber covering the first arc extinguishing structure and capable of relieving the high-pressure gas generated by the explosion of the igniter, and a filter pad disposed outside the pressure relief chamber and capable of adsorbing fine particles generated by the explosion are further provided in the second chamber; correspondingly, a plurality of air windows are also arranged on the protective housing.

[0022] The beneficial effects of the present utility model are as follows: ① By innovating the structure of the blasting circuit breaker, the present utility model can achieve a very timely response (the response time can reach within 2 ms) on the one hand, so that the blasting circuit breaker can be well applied to high-precision products; on the other hand, double arc extinguishing can be carried out to achieve rapid and efficient arc extinguishing, thereby greatly improving the working safety and reliability of the circuit protection device and even the entire circuit system. ② The structure of the blasting circuit breaker of the present utility model is simple and reasonable, small in size, saves installation space, and has a wider application field. Description of the Drawings

[0023] Figure 1 It is a three-dimensional structure diagram of the blasting circuit breaker shown in Embodiment 1 of the present utility model;

[0024] Figure 2 is Figure 1 a semi-sectional structure diagram of the shown blasting circuit breaker;

[0025] Figure 3 is Figure 2 an enlarged structure diagram of part A shown;

[0026] Figure 4 is Figure 2 a partial structure diagram of the semi-sectional structure of the shown blasting circuit breaker;

[0027] Figure 5 is Figure 2 a structure diagram of the shown conductive electric bridge;

[0028] Figure 6 is Figure 2 a structure diagram of the shown igniter;

[0029] Figure 7 is Figure 6 a partial semi-sectional structure diagram of the shown igniter;

[0030] Figure 8 is Figure 6 a partial structure diagram of the shown igniter;

[0031] Figure 9 is Figure 2 a structure diagram of the shown pressure relief chamber;

[0032] Figure 10 isFigure 2 Schematic structural diagram of the filter pad shown;

[0033] Figure 11 Stereoscopic structural diagram of the blasting circuit breaker shown in Embodiment 2 of the present utility model;

[0034] Figure 12 is Figure 11 Schematic semi-sectional structural diagram of the blasting circuit breaker shown;

[0035] Figure 13 is Figure 12 Schematic structural diagram of the conductive bridge shown;

[0036] Figure 14 is Figure 12 Schematic structural diagram of the igniter shown;

[0037] Figure 15 is Figure 14 Schematic partial semi-sectional structural diagram of the igniter shown;

[0038] Figure 16 Partial structural diagram of the connection structure between the pressure relief cavity and the first arc extinguishing structure described in Embodiment 3 of the present utility model.

[0039] The following descriptions are made in conjunction with the accompanying drawings:

[0040] 1. Protective housing; 10. Air window; 11. Perforation A; 12. Step portion A; 13. Perforation B; 14. Stop ring portion; 15. Receiving groove; 2. Conductive bridge; 20. Deflection groove; 21. Disconnection groove; 22. Deflection section; 23. Groove; 24. Step portion B; 25. Auxiliary disconnection groove; 3. Igniter; 30. Ignition electrode; 31. Electrode needle; 32. Encapsulation seat; 33. Medicine cup; 34. Cover; 340. Cover main body; 341. Insertion portion; 41. First arc extinguishing structure; 410. Heat dissipation through hole; 42. Second arc extinguishing structure; 5. Punching head; 6. Pressure relief cavity; 60. Insert block; 61. Clamping portion; 7. Filter pad. Specific embodiments

[0041] The following describes the preferred embodiments of the present utility model in detail in conjunction with the accompanying drawings.

[0042] Embodiment 1:

[0043] Please refer to the attached Figure 1 to the attached Figure 10As shown in the figure, Embodiment 1 of the present invention provides a blasting circuit breaker, which includes a protective housing 1, a conductive bridge 2, an igniter 3 and an arc extinguishing structure. Among them, the protective housing 1 is provided with an inner cavity, and the conductive bridge 2 penetrates through the protective housing 1 and divides the inner cavity of the protective housing 1 into a first chamber and a second chamber; two spaced deflection grooves 20 and a disconnection groove 21 located between the two deflection grooves 20 are provided on the part of the conductive bridge 2 located in the inner cavity, and the section of the conductive bridge 2 located between each deflection groove 20 and the disconnection groove 21 is defined as a deflection section 22; the igniter 3 is inserted into the first chamber and close to the disconnection groove 21. After the igniter 3 is energized, it explodes and can blow open the disconnection groove 21. At the same time, the two deflection sections 22 respectively deflect toward the second chamber with the two deflection grooves 20 as the rotation parts (which can be understood as rotation fulcrums); the arc extinguishing structure is provided with a first arc extinguishing structure 41 built in the second chamber and a second arc extinguishing structure 42 built in the first chamber. The first arc extinguishing structure 41 can extinguish the arc generated between the two deflection sections 22, and the second arc extinguishing structure 42 can be broken into fine particles under the explosion action of the igniter 3, and the fine particles can fall into the second chamber to realize extinguishing the arc generated between the two deflection sections 22.

[0044] As described above, the working principle of the blasting circuit breaker in Embodiment 1 is as follows: When the circuit protection device receives a protection signal, the igniter 3 in the blasting circuit breaker is connected to an external power supply and explodes, quickly achieving the explosion of the disconnection groove 21 (i.e., cutting off the conductive bridge 2), thereby achieving the purpose of cutting off the current and protecting the circuit system. Under the action of the shock wave generated by the explosion, on the one hand, the two deflection segments 22 will respectively deflect towards the second chamber with the two deflection grooves 20 as the rotation parts, that is: the opposite ends (which can also be understood as the disconnected ends) of the two deflection segments 22 will deflect under the action of the shock wave and enter the second chamber, and continue to rotate in the direction away from each other; at that time, the arc generated between the opposite ends of the two deflection segments 22 will be stretched, and will be blown into an arc shape and blown to the first arc extinguishing structure 41 under the action of the shock wave, and the first arc extinguishing structure 41 can cut the arc to achieve the purpose of arc extinguishing; on the other hand, the second arc extinguishing structure 42 will be broken into fine particles with the explosion of the igniter 3, and the fine particles will fall into the second chamber to achieve arc extinguishing for the arc. In short, in Embodiment 1, on the one hand, by arranging the explosion of the igniter 3 to cut off the conductive bridge 2, a very fast and timely response can be achieved, so that it can be well applied to high-precision products. On the other hand, by arranging the first arc extinguishing structure 41 and the second arc extinguishing structure 42 to perform double arc extinguishing on the arc generated between the two deflection segments 22, rapid and efficient arc extinguishing can be achieved, thereby greatly improving the working safety and reliability of the circuit protection device and even the entire circuit system.

[0045] To better understand the working principle of the blasting circuit breaker described in this application, the specific structure of the blasting circuit breaker will be described in detail below.

[0046] First, regarding the igniter 3.

[0047] In Embodiment 1, according to the product design requirements, the igniter 3 adopts a medicine cup type igniter, that is: the igniter 3 is filled with gunpowder (explosive). For the specific implementation structure of the igniter 3, it can preferably adopt the medicine cup type igniter structure provided in Chinese Patent ZL202320960565.9, or other preferred implementation structures can also be adopted. For example: Please refer to the appendix Figures 6 - 8As shown, the igniter 3 includes an ignition electrode 30, an electrode pin 31 for connecting to an external power supply, a packaging seat 32, a medicine cup 33 for containing gunpowder, and a cover 34. Among them, the ignition electrode 30 is provided with a bridge wire made of platinum-tungsten alloy material and a pad electrically connected to the bridge wire. The electrode pin 31 is welded and fixed to the pad. The packaging seat 32 is fixedly sleeved outside the electrode pin 31 through an injection molding process, and one end of the electrode pin 31 also extends outside the packaging seat 32. The medicine cup 33 is a cylindrical structure and is integrally injection-molded and connected to the packaging seat 32. At the same time, the medicine cup 33 also surrounds the ignition electrode 30, so that when the ignition electrode 30 is energized and heated, the gunpowder can be quickly detonated. The cover 34 adopts a multi-layer structure (such as three layers) and is fixedly sleeved outside the medicine cup 33 by welding, gluing or other fixed connection methods. It can be understood that in the above preferred structure of the igniter 3, since the bridge wire in the ignition electrode 30 is made of platinum-tungsten alloy material, and the platinum-tungsten alloy material has a very high melting point, high resistivity and high resistance strain sensitivity coefficient, the response time of the bridge wire to the gunpowder can be made faster. Furthermore, the igniter 3 can quickly cut off the conductive bridge 2 within 2 ms, and the response speed is very sensitive and fast, which greatly ensures that the blasting circuit breaker described in Embodiment 1 can be well applied to high-precision products.

[0048] In addition, in order to further shorten the response time of the igniter 3 to cut off the conductive bridge 2, and to ensure that the break of the break groove 21 is neat and free of burrs, in Embodiment 1, a punching head 5 that can press against the break groove 21 is fixedly sleeved outside the igniter 3 (please refer to the attached Figure 3 figure). That is, under the action of the explosion shock wave, the punching head 5 is driven to move quickly downward to cut off the break groove 21. It can be understood that since the punching head 5 directly presses against the break groove 21, rapid response and neat cutting / without burrs can be achieved. Of course, the configuration of the punching head 5 is determined based on the product design requirements. In some cases, it may not be configured. For example, when the power of the conductive bridge 2 is small, the punching head 5 may not be configured.

[0049] Next, regarding the protective housing 1.

[0050] In Embodiment 1, the preferred structure of the protective housing 1 is: Please continue to refer to the attached Figure 1 , attached Figure 2 and attached Figure 4As shown, based on the following orientation definition: the first chamber is located above the second chamber, and the protective housing 1 is provided with an upper part, a bottom wall and side walls around. Among them, a plurality of air windows 10 are arranged on the side walls of the protective housing 1, and the high-pressure gas discharged after the ignition device 3 explodes can be discharged to the outside through the air windows 10; through holes A11 for the conductive bridge 2 to pass through are respectively opened on the opposite side walls of the protective housing 1, and a step portion A12 capable of stopping and restricting the conductive bridge 2 is integrally provided on the inner wall or beside the through hole A11; a through hole B13 for the electrode pin 31 of the ignition device 3 to extend out is penetrated through the upper part of the protective housing 1. In addition, a stop ring portion 14 that is integrally convex on the inner wall of the upper part of the protective housing 1 and matches the shape of the encapsulation seat 32 of the ignition device 3 and can stop and restrict the encapsulation seat 32, and a receiving groove 15 that is integrally concave on the inner wall of the upper part of the protective housing 1 and can receive and restrain the second arc extinguishing structure 42 are also provided.

[0051] Next, regarding the conductive bridge 2.

[0052] In this embodiment 1, the structure of the conductive bridge 2 preferably adopted is: Please refer to the attached Figure 3 and the attached Figure 5 As shown, the conductive bridge 2 is integrally long strip-shaped and can be made of copper or aluminum. The two deflection grooves 20 arranged on the conductive bridge 2 are arranged side by side along the length direction of the conductive bridge 2. And according to the product design requirements and based on the above orientation definition, the vertical cross-section of the two deflection grooves 20 is any one of U-shaped, arc-shaped, V-shaped, ︹-shaped and ︺-shaped. It can be understood that the two deflection grooves 20 are both recessed on the upper surface / or the lower surface of the conductive bridge 2; further preferably, the attached Figure 5 shows the case where the vertical cross-section of the two deflection grooves 20 is ︺-shaped; the disconnection groove 21 is centered between the two deflection grooves 20, and the vertical cross-section of the disconnection groove 21 is any one of V-shaped, ︹-shaped and ︺-shaped. It can be understood that the disconnection groove 21 is also recessed on the upper surface / or the lower surface of the conductive bridge 2; further preferably, the attached Figure 5 shows the case where the vertical cross-section of the disconnection groove 21 is V-shaped.

[0053] Furthermore, to more easily cut the disconnection groove 21, an auxiliary disconnection groove 25 with a vertical cross-section of inverted V-shaped, ︹-shaped or ︺-shaped can also be recessed on one surface of the conductive bridge 2 opposite to the disconnection groove 21. Specifically, with the attached Figure 3 and the attached Figure 5Taking the case of "the disconnection groove 21 is recessed in the upper surface of the conductive bridge 2" shown in the figure as an example, in the first embodiment 1, the auxiliary disconnection groove 25 with an inverted V-shaped or ︹-shaped vertical cross-section may be recessed at a position on the lower surface of the conductive bridge 2 and directly opposite to the disconnection groove 21.

[0054] In addition, in order to cooperate with the stepped portion A12 on the protective housing 1, a stepped portion B24 capable of being engaged / stopped with the stepped portion A12 is also provided on the conductive bridge 2. For details, please refer to the attached Figure 3 and the attached Figure 5 as shown.

[0055] Next, regarding the arc extinguishing structure.

[0056] In the first embodiment 1, the structures of the first arc extinguishing structure 41 and the second arc extinguishing structure 42 preferably adopted are as follows: Please refer to the attached Figure 2 and the attached Figure 4 as shown. The first arc extinguishing structure 41 is a block structure made of ceramic or insulating resin material and is positioned on the bottom wall of the second chamber (note that in actual application, it is not limited to the above ceramic or insulating resin material, and the first arc extinguishing structure 41 can also be made of other arc extinguishing materials). Moreover, based on the above orientation definition, the first arc extinguishing structure 41 is also provided with a plurality of heat dissipation through holes 410 respectively penetrating through its upper and lower surfaces. Further, the hole shape of the heat dissipation through holes 410 can be a circular hole or a slot hole (i.e., an irregular / non-conventional drilled hole). It can be understood that the first arc extinguishing structure 41 integrates functions such as arc extinguishing, heat dissipation, current shunting and pressure relief.

[0057] In addition, taking the state where the igniter 3 is not energized as a reference, the downward projections of the two deflection grooves 20 both completely or partially fall on the upper surface of the first arc extinguishing structure 41. In this way, when the two deflection segments 22 respectively deflect towards the second chamber with the two deflection grooves 20 as the rotation parts, it can be ensured that the downward deflection trajectories of the relative ends of the two deflection segments 22 are both projected on the upper surface of the first arc extinguishing structure 41, so as to ensure that the first arc extinguishing structure 41 can effectively extinguish the arc generated between the relative ends of the two deflection segments 22. Of course, in order to better improve the arc extinguishing effect, the upper surface of the first arc extinguishing structure 41 can also be designed as a concave arc surface.

[0058] Please refer to the attached Figure 3As shown, the second arc extinguishing structure 42 is a ring structure cast from quartz sand or insulating resin material, which is easily broken into fine particles under the action of the explosion shock wave. Moreover, the second arc extinguishing structure 42 is positioned and installed in the first chamber and surrounds the igniter 3. Specifically, the second arc extinguishing structure 42 is installed in the receiving slot 15 of the protective housing 1 and is blocked and restricted by the conductive bridge 2.

[0059] Finally, regarding other components.

[0060] In the first embodiment 1, a pressure relief chamber 6 that covers the first arc extinguishing structure 41 and can relieve the high-pressure gas generated by the explosion of the igniter 3, and a filter pad 7 that is arranged outside the pressure relief chamber 6 and can adsorb the fine particles generated by the explosion are also provided in the second chamber. Please refer to the attached Figure 2 and the attached Figure 4 as shown.

[0061] Furthermore, please refer to the attached Figure 9 as shown. The pressure relief chamber 6 is a hollow structure with openings on the upper and lower sides and opposite two vertical sides, and is positioned in the second chamber. The way the pressure relief chamber 6 is positioned in the second chamber is: an insertion block 60 is integrally provided on the pressure relief chamber 6, and a slot that is inserted and matched with the insertion block 60 is integrally provided on the inner wall of the second chamber.

[0062] In addition, the first arc extinguishing structure 41 is positioned on the bottom wall of the second chamber through the pressure relief chamber 6. Specifically: please refer to the attached Figure 4 as shown. A clamping portion 61 that can clamp and position the first arc extinguishing structure 41 is integrally protruded on the inner wall of the pressure relief chamber 6.

[0063] Please refer to the attached Figure 10 as shown. The filter pad 7 is preferably a U-shaped body made of filter cotton, and it covers the lower opening side and opposite two opening vertical sides of the pressure relief chamber 6 to prevent the fine particles generated by the explosion from flying out to the outside through the air window 10.

[0064] Embodiment 2:

[0065] This embodiment 2 also provides a blasting circuit breaker. Compared with the first embodiment 1, the blasting circuit breaker described in this embodiment 2 has the following differences: ① The structure of the igniter 3 described in this embodiment 2 is not completely the same as that in the first embodiment 1; ② The structure of the conductive bridge 2 described in this embodiment 2 is also not completely the same as that in the first embodiment 1.

[0066] Specifically, regarding the above difference ①;

[0067] Compared with the structure of the igniter 3 provided in Embodiment 1, the biggest difference in the structure of the igniter 3 provided in this Embodiment 2 lies in that: the structure of the cover 34 and its connection manner with the medicine cup 33 are different from those in Embodiment 1.

[0068] Please refer to the attached Figure 11 , the attached Figure 12 , the attached Figure 14 and the attached Figure 15 As shown, taking the installation state of the igniter 3 provided in this Embodiment 2 as a reference and based on the above orientation definition, the cover 34 is provided with a cover body 340 in the shape of a hollow cylinder with an open top side and a plugging portion 341 protruding upward from the bottom wall of the cover 34. When the cover body 340 is sleeved outside the medicine cup 33, the plugging portion 341 can be tightly inserted into the medicine cup 33, thereby completing the tight assembly between the cover 34 and the medicine cup 33.

[0069] Note: Except for the above differences, other components and connection manners in the structure of the igniter 3 in this Embodiment 2, such as: the structures of the ignition electrode 30, the electrode needle 31, the encapsulation seat 32 and the medicine cup 33, and their connection manners with each other, can all adopt the same technical means as those in Embodiment 1, so they will not be elaborated here.

[0070] Regarding the above difference point ②;

[0071] Compared with the structure of the conductive bridge 2 provided in Embodiment 1, the biggest difference in the structure of the conductive bridge 2 provided in this Embodiment 2 lies in that: a groove 23 is further provided on the conductive bridge 2 in this Embodiment 2, which is different from that in Embodiment 1.

[0072] Please refer to the attached Figure 13 As shown, in the structure of the conductive bridge 2 provided in this Embodiment 2, a groove 23 is also recessed at a position on the conductive bridge 2 between the two deflection grooves 20 for placing one end of the igniter 3; and further, the groove 23 is also communicated with the disconnection groove 21. It can be understood that the function of the groove 23 is similar to that of the punching head 5, both for more quickly cutting off the disconnection groove 21.

[0073] Note: Other components on the conductive bridge 2 in this Embodiment 2, such as: the structures of the deflection groove 20, the disconnection groove 21, the deflection section 22, and the step portion B24, can all adopt the same technical means as those in Embodiment 1, so they will not be elaborated here.

[0074] In summary, except for the above-mentioned differences ① and ②, other components in the blasting circuit breaker described in this Embodiment 2, such as: the arc extinguishing structure, the protective housing 1, the pressure relief chamber 6, the filter pad 7, etc., can all adopt the same technical means as in Embodiment 1, so they will not be elaborated here.

[0075] Embodiment 3:

[0076] This Embodiment 3 also provides a blasting circuit breaker, and compared with Embodiment 1, the blasting circuit breaker described in this Embodiment 3 has the following differences: ① The connection method between the first arc extinguishing structure 41 and the pressure relief chamber 6 in this Embodiment 3 is different from that in Embodiment 1. ② The shape of the insertion block 60 on the pressure relief chamber 6 is slightly different from that in Embodiment 1.

[0077] Specifically, regarding the above-mentioned difference ①;

[0078] In this Embodiment 3, the first arc extinguishing structure 41 is fixedly connected to the pressure relief chamber 6 through an injection molding process. Please refer to the appendix Figure 16 as shown.

[0079] Furthermore, based on the above injection molding process, both the first arc extinguishing structure 41 and the pressure relief chamber 6 are made of insulating resin materials.

[0080] Regarding the above-mentioned difference ②;

[0081] Please continue to refer to the appendix Figure 16 as shown. In this Embodiment 3, the insertion block 60 is convex-shaped; correspondingly, the shape of the slot on the inner wall of the second chamber matches the shape of the insertion block 60.

[0082] In summary, except for the above-mentioned differences ① and ②, other components in the blasting circuit breaker described in this Embodiment 3, such as: the protective housing 1, the conductive bridge 2, the igniter 3, the arc extinguishing structure, the filter pad 7, etc., can all adopt the same technical means as in Embodiment 1, so they will not be elaborated here.

[0083] Finally, the prefixes "first", "second", etc. (such as the first arc extinguishing structure, the second arc extinguishing structure, etc.) and the suffixes "A", "B", etc. (such as perforation A, perforation B, etc.) of the component names in the specification of this utility model patent are only for the convenience of clear description, rather than to limit the scope of implementation of this utility model patent.

[0084] To sum up, the blasting circuit breaker described in this utility model responds promptly and extinguishes arcs quickly and efficiently. It can not only be well applied to high-precision products, but also greatly improve the working safety and reliability of circuit protection devices and even the entire circuit system.

[0085] In the above description, many specific details are set forth in order to fully understand the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific implementations disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. All those that do not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A blasting circuit breaker, characterized in that: Comprising: A protective housing (1) provided with an inner cavity; A conductive electric bridge (2) passing through the protective housing (1) and dividing the inner cavity of the protective housing (1) into a first chamber and a second chamber; two spaced-apart deflection grooves (20) are provided at a position of the conductive electric bridge (2) within the inner cavity, and a disconnection groove (21) is located between the two deflection grooves (20). A section of the conductive electric bridge (2) between each deflection groove (20) and the disconnection groove (21) is a deflection section (22); An igniter (3) inserted into the first chamber and close to the disconnection groove (21); after the igniter (3) is energized, it explodes and can blow open the disconnection groove (21), and at the same time, the two deflection sections (22) respectively deflect towards the second chamber with the two deflection grooves (20) as the rotation positions; An arc extinguishing structure provided with a first arc extinguishing structure (41) built into the second chamber and a second arc extinguishing structure (42) built into the first chamber; the first arc extinguishing structure (41) can extinguish the arc generated between the two deflection sections (22), and the second arc extinguishing structure (42) can be broken into fine particles under the explosion action of the igniter (3) to achieve extinguishing the arc generated between the two deflection sections (22).

2. The blasting circuit breaker according to claim 1, characterized in that: The second arc extinguishing structure (42) is an annular structure cast from quartz sand or insulating resin material, and is positioned and installed in the first chamber and surrounds the outside of the igniter (3).

3. The blasting circuit breaker according to claim 1, characterized in that: It is defined that the first chamber is located above the second chamber; The first arc extinguishing structure (41) is a block structure made of ceramic or insulating resin material and is positioned on the bottom wall of the second chamber.

4. The blasting circuit breaker according to claim 3, wherein: The first arc extinguishing structure (41) is provided with a plurality of heat dissipation through holes (410) respectively penetrating through its upper and lower surfaces.

5. The blasting circuit breaker according to claim 3, wherein: Based on the state where the igniter (3) is not energized, the downward projections of the two deflection grooves (20) all completely or partially fall on the upper surface of the first arc extinguishing structure (41); In addition, the upper surface of the first arc extinguishing structure (41) is a concave arc surface.

6. The blasting circuit breaker according to claim 1, wherein: The igniter (3) adopts a medicine cup type igniter, and the bridge wire in the igniter (3) is made of platinum-tungsten alloy material.

7. The blasting circuit breaker according to claim 1, wherein: The conductive electric bridge (2) is strip-shaped, and the two deflection grooves (20) are arranged side by side along the length direction of the conductive electric bridge (2), and the disconnection groove (21) is centered between the two deflection grooves (20); In addition, it is defined that the first chamber is located above the second chamber; the vertical cross-section of the deflection groove (20) is any one of U-shaped, arc-shaped, V-shaped, ︹-shaped, and ︺-shaped, and the vertical cross-section of the disconnection groove (21) is any one of V-shaped, ︹-shaped, and ︺-shaped.

8. The blasting circuit breaker according to claim 1, wherein: A groove (23) for placing one end of the igniter (3) is further recessed at a position of the conductive electric bridge (2) between the two deflection grooves (20), and the groove (23) communicates with the disconnection groove (21).

9. The blasting circuit breaker according to claim 1, characterized in that: An impact cutting head (5) is externally and fixedly sleeved on the igniter (3), and the impact cutting head (5) presses against the breaking groove (21).

10. The blasting circuit breaker according to claim 1, characterized in that: A pressure relief chamber (6) that covers the first arc extinguishing structure (41) and can relieve the high-pressure gas generated by the explosion of the igniter (3), and a filter pad (7) that is arranged outside the pressure relief chamber (6) and can adsorb fine particles generated by the explosion are further arranged in the second chamber; Correspondingly, a plurality of air windows (10) are further arranged on the protective housing (1).

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