Pyrotechnic type circuit breaker

Abstract

The invention provides a pyrotechnic type circuit breaker, which is applied to the technical field of circuit breakers, in the circuit breaker, a vertical channel is formed in a shell, an igniter shell is fixed at one end of the vertical channel, at least part of a conductive metal bar extends into the vertical channel, a piston is movably arranged in the vertical channel, and under the action of an igniter, the conductive metal bar extends into the vertical channel. The piston can move between the initial position close to the igniter shell and the final position of the other end of the vertical channel so as to cut off the conductive metal bar, the igniter shell comprises a ring arm extending towards the vertical channel, and the piston is arranged on the ring arm in a sleeving mode. Comprising an outer wall part attached to the outer surface of the ring arm in the circumferential direction and a first protruding part extending to the inner hollow space of the ring arm, the first protruding part is attached to the inner surface of the ring arm in the circumferential direction, and the igniter is arranged in the ring arm and is opposite to the top surface of the first protruding part. And therefore, a roundabout sealing path and / or an insulating path is formed between the fracture of the conductive metal bar and the igniter.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to a pyrotechnic circuit breaker. Background Art

[0002] A pyrotechnic high-voltage circuit breaker (Pyrofuse) is a device that uses the energy generated by the explosion of gunpowder to cut off the high-voltage circuit loop in an instant.

[0003] The standards for judging the performance and safety of pyrotechnic high-voltage circuit breakers (Pyrofuse, also known as fuses) mainly include the following two points:

[0004] 1. After the pyrotechnic high-voltage circuit breaker (Pyrofuse) cuts off the circuit, it is necessary to ensure that the insulation resistance between the conductive metal bar and the igniter is large enough and the creepage distance is long enough to protect the components in the low-voltage circuit where the igniter is located from damage.

[0005] Reason: After the circuit is cut off, the high voltage at both ends of the conductive metal busbar still exists. There is a risk of arc breakdown from the cut metal busbar to the igniter, which may cause damage to related components in the low-voltage circuit where the igniter is located.

[0006] 2. During the process of igniting and cutting off the circuit, the pyrotechnic high-voltage circuit breaker (Pyrofuse) needs to ensure that the high-temperature and high-pressure gas in the ignition chamber will not leak out, and it needs to have good sealing performance to protect the components around the pyrotechnic high-voltage circuit breaker from damage.

[0007] Reason: During the cutting process, due to the energy generated by the igniter and the energy of the arc generated by the cutting of the metal row, high-temperature and high-pressure gas will be instantly generated in the ignition chamber. If the sealing performance of the ignition chamber is not good, these high-temperature gases may leak to the outside with dust, thereby damaging the surrounding components.

[0008] The existing pyrotechnic high-voltage circuit breakers have deficiencies in the above two aspects, and thus a new technical solution for pyrotechnic high-voltage circuit breakers is needed. Summary of the invention

[0009] In view of this, the embodiments of this specification provide a pyrotechnic circuit breaker, which can form a circuitous insulation path and a sealing path inside the circuit breaker by optimizing and improving the piston structure, thereby improving the insulation performance, sealing performance and other properties of the circuit breaker.

[0010] The embodiments of this specification provide the following technical solutions:

[0011] The embodiment of the present specification provides a pyrotechnic circuit breaker, comprising: an igniter, an igniter housing, a piston, a conductive metal row and a shell, wherein a vertical channel is formed in the shell, the igniter housing is fixed at one end of the vertical channel, the conductive metal row at least partially extends into the vertical channel, the piston is movably arranged in the vertical channel, and when the igniter is actuated, it can move between an initial position close to the igniter housing and a final position at the other end of the vertical channel to cut off the conductive metal row, the igniter housing comprises a ring arm extending toward the vertical channel, the piston is sleeved on the ring arm, comprises an outer wall portion circumferentially abutting against the outer surface of the ring arm and a first protrusion extending into the inner hollow space of the ring arm, the first protrusion circumferentially abutting against the inner surface of the ring arm, the igniter is placed in the ring arm and opposite to the top surface of the first protrusion, a circuitous sealing path and / or insulating path is formed between the fracture of the conductive metal row and the igniter.

[0012] Preferably, a first sealing ring is provided between the vertical channel and the outer wall portion, and a second sealing ring is provided between the outer wall portion and the ring arm. When the piston is located at the final position, the first sealing ring is located above the fracture of the conductive metal row, and the second sealing ring is located near the end position of the outer wall portion and / or the ring arm.

[0013] And / or, a third sealing ring is further provided between the vertical channel and the outer wall portion, and when the piston is located at the final position, the third sealing ring is placed below the fracture of the conductive metal row,

[0014] And / or, a fourth sealing ring is nested on the vertical channel below the conductive metal row, and when the piston is located at the final position, the fourth sealing ring abuts against the outer surface of the outer wall portion.

[0015] Preferably, the outer side of the outer wall portion is formed with a first circumferential groove and a third circumferential groove, which are respectively used to sleeve the first sealing ring and the third sealing ring, the outer surface of the ring arm is provided with a second circumferential groove, which is used to sleeve the second sealing ring, and the inner surface of the vertical channel is formed with a fourth circumferential groove, which is used to nest the fourth sealing ring.

[0016] Preferably, a plurality of arc extinguishing chambers are further provided in the shell, which are located at the periphery of the vertical channel and connected with the vertical channel through a radial channel. When the piston is located at the final position, the third sealing ring and / or the fourth sealing ring is located between the fracture of the conductive metal row and the radial channel.

[0017] Preferably, in the pyrotechnic circuit breaker described in any one of the implementation examples in the present application, the shell is also provided with a guide column extending upward from the bottom of the vertical channel, and a hollow first recessed portion is provided below the first protrusion, and when the piston moves from the initial position to the final position, the guide column engages with the first recessed portion to provide a guiding effect.

[0018] Preferably, the guide column and the first recessed portion are interference-fitted to lock the piston in the final position;

[0019] And / or, the first recessed portion is a star-shaped structure, and the cross-section of the guide column is any one of an oblate, triangular, square and star-shaped.

[0020] Preferably, the guide column has a second protrusion, the first recessed portion is provided with a second groove, and the second protrusion cooperates with the second groove to lock the piston and the housing at the final position.

[0021] Preferably, the shell comprises an upper shell and a lower shell, the conductive metal row is installed between the upper shell and the lower shell, and the vertical channel extends from one end of the upper shell to the bottom of the lower shell, and the upper shell and the lower shell are fixed by mounting bolts.

[0022] Preferably, the conductive metal bar is provided with a plastic-coated shell, the interior of the plastic-coated shell is hollow, and the hollow surface inside the plastic-coated shell is in contact with the outer surface of the outer wall.

[0023] Preferably, the igniter is wrapped and sealed by the igniter housing, and the sealing process includes any one of the following processes: plastic wrapping, glue potting, and sealing.

[0024] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0025] By improving the internal structure of the circuit breaker, a circuitous insulation path and a sealing path can be formed, thereby improving the insulation performance, sealing performance, etc. of the circuit breaker. Therefore, there is as large an insulation resistance and as long a creepage distance as possible between the conductive metal bar and the igniter, thereby protecting other components of the low-voltage circuit where the igniter is located; and the cavity of the pyrotechnic high-voltage circuit breaker (Pyrofuse) has sufficient sealing performance, thereby protecting other components around the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a schematic diagram of an explosion of a pyrotechnic circuit breaker in the present application;

[0028] Figure 2a It is a schematic diagram of the cross-sectional structure of a pyrotechnic circuit breaker before cutting in the present application;

[0029] Figure 2b It is a schematic diagram of the circuitous sealing circuit before the circuit breaker is cut off in the present application;

[0030] Figure 2c It is a schematic diagram of the circuitous insulation circuit before the circuit breaker is cut off in this application;

[0031] Figure 2d It is a schematic diagram of the cross-sectional structure of the circuit breaker after being cut off in the present application;

[0032] Figure 2e It is a schematic diagram of the circuitous sealing circuit after the circuit breaker is cut off in the present application;

[0033] Figure 2f It is a schematic diagram of the circuitous insulation circuit after the circuit breaker is cut off in this application;

[0034] Figure 2g It is a schematic diagram of the arc path generated at the front end of the metal bar after the circuit breaker is cut off in the present application;

[0035] Figure 2h It is a schematic diagram of the movement direction of the circuit breaker ignition explosion in this application;

[0036] Figure 2i This is a schematic diagram of the random distribution area of ​​debris generated by the circuit breaker cutting off the metal bar in the present application;

[0037] Figure 2j It is a schematic diagram of using a piston to drive a seal to clean debris in this application;

[0038] Figure 3a It is a schematic diagram of the structure of the conductive metal bar in the present application without a plastic-encapsulated shell;

[0039] Figure 3b It is a cross-sectional schematic diagram of the conductive metal bar of the plastic-wrapped housing before being cut off in the circuit breaker of the present application;

[0040] Figure 3cIt is a cross-sectional schematic diagram of the conductive metal bar after being cut off after the plastic-coated shell is used in the circuit breaker in the present application;

[0041] Figure 4 It is a schematic diagram of a circuit breaker in the present application in which a seal is provided between the conductive metal bar and the housing;

[0042] Figure 5a It is a schematic diagram of the relative positions of the guide post and the piston of the circuit breaker before cutting in the present application;

[0043] Figure 5b It is a schematic diagram of the relative positions of the guide column and the piston of the circuit breaker after cutting in the present application;

[0044] Figure 5c It is a structural schematic diagram of the guide column in this application;

[0045] Figure 5d and Figure 5e It is a three-dimensional structural schematic diagram of the piston in this application;

[0046] Figure 6a It is a schematic diagram of the three-dimensional structure of the flat guide column in this application;

[0047] Figure 6b is a schematic diagram of the cross-sectional structure of the circuit breaker using the flat guide column in the present application before being cut;

[0048] Figure 6c is a schematic diagram of the cross-sectional structure of the circuit breaker using the barbed guide column in the present application before being cut;

[0049] Figure 6d It is a schematic diagram of the three-dimensional structure of the barb guide column in the present application;

[0050] Figure 7a and Figure 7b It is a three-dimensional structural schematic diagram of the igniter housing in this application;

[0051] Explanation of the reference numerals: 1: upper metal gasket; 2: short-circuit clamp; 3: igniter; 4: igniter housing; 5: second sealing ring; 6: piston; 7: first sealing ring; 8: third sealing ring; 9: upper shell; 10: plastic-coated conductive metal row; 11: fourth sealing ring; 12: arc extinguishing block; 13: fifth sealing ring; 14: lower shell; 15: lower metal gasket; 16: bolt; ring arm: 41; second circumferential groove: 411; outer wall portion: 61; first protruding portion: 62; first circumferential groove: 611; third circumferential groove: 612; first recessed portion: 613; second recessed groove: 614; guide column: 141; second protruding portion: 142; arc extinguishing chamber: 143; radial channel: 144. DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0053] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0054] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0055] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0056] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0057] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0058] refer to Figure 1As shown in the exploded diagram, the present application provides a pyrotechnic circuit breaker, including: an igniter 3, an igniter housing 4, a piston 6, a conductive metal row 10 and a housing (the housing can be a separate upper housing 9 and a lower housing 14, or a housing of an integral structure), a vertical channel (such as a hollow channel inside the housing) is formed in the housing, so that the igniter housing 4 can be fixed at one end of the vertical channel, and the conductive metal row 10 at least partially extends into the vertical channel, and the piston 6 is movably arranged in the vertical channel. Therefore, after the igniter 3 is placed in the ring arm and arranged relative to the top surface of the first protrusion, when the igniter 3 is actuated, the piston 6 can be in an initial position close to the igniter housing 4 (such as Figure 2a The position of the piston 6 shown in the figure) to the final position at the other end of the vertical channel (for example Figure 2b The piston 6 is shown in the figure) so as to cut off the conductive metal row 10 by the movement of the piston 6, thereby realizing the circuit breaking function.

[0059] refer to Figure 2a-2h As shown in the figure, the igniter housing 4 and the piston 6 adopt a new structural form. Among them, the igniter housing 4 adopts the following structural form: the igniter housing 4 includes a ring arm 41 extending toward the vertical channel, and the inside of the ring arm 41 is set to be hollow, so the igniter housing 4 with the ring arm 41 can be set as a structural member with a U-shaped cross section (or a cylindrical structural member with a hollow interior); and the piston 6 adopts the following structural form: the piston 6 includes an outer wall portion 61 circumferentially attached to the outer surface of the ring arm 41 and a first protrusion 62 extending to the inner hollow space of the ring arm 41 of the igniter housing 4, and the first protrusion 62 circumferentially attaches to the inner surface of the ring arm 41, so the piston 6 with the outer wall portion 61 and the first protrusion 62 can be set as a structural member with a double U-shaped (or W-shaped) cross section.

[0060] Therefore, through the structural improvement of the piston 6 and the igniter housing 4, a circuitous sealing path and / or insulating path can be formed between the fracture of the conductive metal row 10 and the igniter 3 before and after cutting.

[0061] refer to Figure 2a-2c As shown in the cut-off front cross-section, the piston 6 is in the initial position, the first protrusion 62 of the piston 6 is embedded in the internal hollow space of the ring arm 41 of the igniter housing 4, and the ring arm 41 of the igniter housing 4 is embedded in the internal space formed by the outer wall portion 61 of the piston 6, so that the igniter housing 4 and the piston 6 are nested with each other, so that the nested and fitted surfaces between the igniter housing 4 and the piston 6 form a sufficiently long circuitous path, such as Figure 2b The black thick line indicates that a circuitous sealing path is formed between the piston 6 and the igniter housing 4, such as Figure 2cThe thick black line indicates that a circuitous insulating path is formed between the piston 6 and the igniter housing 4 .

[0062] refer to Figure 2d-Figure 2f The cut-off cross-section shows that the piston 6 is in the final position after cutting off the conductive metal row 10, and the ring arm 41 of the igniter housing 4 is still partially embedded in the internal space formed by the outer wall portion 61 of the piston 6, so that the igniter housing 4 and the piston 6 are nested, so that the nested and fitted surfaces between the igniter housing 4 and the piston 6 form a circuitous path, such as Figure 2e The black thick line indicates that a circuitous sealing path is formed between the piston 6 and the igniter housing 4, such as Figure 2f The thick black line indicates that a circuitous insulating path is formed between the piston 6 and the igniter housing 4 .

[0063] In summary, from the perspective of sealing performance, the high-temperature gas generated by the igniter 3 needs to pass through a sufficiently long path and pass through sufficient insulating seals before it can leak out. This compact design structure can provide sufficient sealing with a smaller volume space, thereby protecting the components around the high-voltage circuit breaker;

[0064] Also, from the insulation performance point of view, whether before or after cutting, if an arc is to be generated between the conductive metal bar 10 and the igniter 3, the arc also needs to pass through a sufficiently long path and pass through a sufficient number of insulating seals. This compact design structure can provide sufficient insulation protection with a smaller volume space, thereby protecting low-voltage circuit components.

[0065] In some embodiments, the surfaces of the igniter housing and the piston top are attached to form a sufficiently long circuitous path, and the piston top tightly fits the inner surface and the outer surface of the igniter housing, which is a compact structural design. Therefore, sufficient insulating seals can be inserted into this sufficiently long path, thereby greatly improving the insulation resistance and creepage distance, and ensuring sufficient insulation and sealing performance before and after the circuit is cut off.

[0066] In one example, a sealing ring is used as the sealing member.

[0067] refer to Figure 2a and Figure 2d As shown in the figure, a first sealing ring 7 is provided between the vertical channel and the outer wall portion 61, and a second sealing ring 5 is provided between the outer wall portion 61 and the ring arm 41. When the piston 6 is located in the final position, the first sealing ring 7 is located above the fracture of the conductive metal row 10, and the second sealing ring 5 is located near the end position of the outer wall portion 61 and / or the ring arm 41.

[0068] In addition, the first sealing ring 7 and the second sealing ring 5 are insulating seals that supplement the sealing and insulating properties and can enhance the sealing and insulating effects. Figure 2a The schematic diagram of the detonation start state) to the detonation end state) reference Figure 2d The entire process (shown as the end of ignition) can play a better insulating and sealing role.

[0069] In practice, the first sealing ring 7 and the second sealing ring 5 can be arranged on the igniter housing, the external housing or the piston. As long as these sealing members are arranged on the sealing path and the insulating path, they are within the protection scope of this application. In addition, the size and shape of the sealing members are not specifically limited.

[0070] refer to Figure 2a and Figure 2d As shown in FIG. 1 , other sealing members may also be provided, such as a third sealing ring 8 and / or a fourth sealing ring 11.

[0071] In one example, a third sealing ring 8 is further provided between the vertical channel and the outer wall portion 61 , wherein when the piston 6 is located at the final position, the third sealing ring 8 is placed below the fracture of the conductive metal row 10 .

[0072] In one example, a fourth sealing ring 11 is nested on the vertical channel below the conductive metal row 10 , and when the piston 6 is located at the final position, the fourth sealing ring 11 abuts against the outer surface of the outer wall portion 61 .

[0073] In practice, by adding the third sealing ring 8 and / or the fourth sealing ring 11, not only the sealing performance of the circuitous path can be enhanced, but also the arc extinguishing effect can be achieved.

[0074] Specifically, when the igniter 3 of the high-voltage circuit breaker explodes and pushes the piston 6 downward, the piston 6 breaks the conductive metal bar 10 into two parts: the first part 10a that is cut off and moves downward, and the second part 10b that is fixed at both ends. Since there are other components with inductance in the high-voltage circuit where the conductive metal bar 10 is located, the process of the current being cut off and becoming zero is hindered, and an arc may exist between the first part 10a and the second part 10b (see Figure 2g The thick solid line indicates the arc path. Therefore, under the action of the third sealing ring 8 and / or the fourth sealing ring 11, the high-voltage circuit breaker can extinguish the arc as quickly as possible, speeding up the process of reducing the short-circuit high current to zero, so as to ensure the safety of other components in the circuit.

[0075] The working principle is as follows: because the sealing ring is located very close to the bottom of the conductive metal row, the moment the first portion 10a is broken off from the conductive metal row 10, the arc path will be immediately blocked by the sealing ring, thereby accelerating the arc extinguishing speed.

[0076] It should be noted that no matter how the size and shape of the seal changes, as long as an insulating seal is arranged near the bottom of the cut-off point of the conductive metal copper busbar, it falls within the scope of protection of this patent.

[0077] In addition, the second sealing ring 8 can also play a further role in the cutting process, as shown below:

[0078] The igniter 3 of the high voltage circuit breaker explodes and pushes the piston 6 downward, and the piston 6 breaks the conductive metal row 10 into two parts: the first part 10a that is cut and moves downward and the second part 10b that is fixed at both ends. Figure 2h The piston moves after detonation, cutting off the Figure 2a After the state changes to cut off Figure 2d In the cutting process, since the first part 10a and the second part 10b are cut and separated, some metal debris may be generated at the cut, and these debris may be randomly scattered on the Figure 2i The thick black solid line indicates the gap in the position;

[0079] If the second sealing ring 8 is not provided, the gaps where the metal scraps are randomly distributed may be located in the aforementioned Figure 2c Among the potential arc paths shown, for example Figure 2i The black thick line indicates the area. Since the metal chips are conductors, they will destroy / reduce the insulation performance of the high-voltage circuit breaker after it is cut off. In the case of adding the second sealing ring 8, the piston 6 will drive the second sealing ring 8 to pass through the cutout during the downward process, and "sweep" the generated metal chips into the lower cavity of the shell (see the distribution of metal chips). Figure 2j The thick black solid line area is shown in the figure), thereby avoiding the influence of the generated metal chips on the insulation and sealing performance after cutting, because the metal chips are not distributed on the sealing path or the insulation path at this time.

[0080] In practice, the second sealing ring 8 is on the piston 6 and passes through the fracture of the conductive metal row 10 with the piston 6 during the cutting process, so that the second sealing ring 8 is used to "clean" the debris generated by the fracture, and the size, shape, etc. of the second sealing ring 8 are not specifically limited.

[0081] In some embodiments, corresponding grooves are provided on the structural member so that the seal is embedded in the groove, which can enhance the sealing performance and increase the structural stability, and allow the seal to move relative to the moving structural member.

[0082] In some examples, reference Figure 2a As shown in the figure, a first circumferential groove 611 and a third circumferential groove 612 are formed on the outside of the outer wall portion 61, which are used to sleeve the first sealing ring 7 and the third sealing ring 8 respectively; a second circumferential groove 411 is formed on the outer surface of the ring arm 41, which is used to sleeve the second sealing ring 5; a fourth circumferential groove is formed on the inner surface of the vertical channel, which is used to nest the fourth sealing ring 11.

[0083] For example, a groove is provided on the piston 6 for sleeve-mounting the first sealing ring 7 and the third sealing ring 8 , and the first sealing ring 7 and the third sealing ring 8 can move along with the piston 8 .

[0084] In some embodiments, the cross-section of the aforementioned sealing member can be any of the following shapes: circular, rectangular, trapezoidal, etc. For example, the fourth sealing ring 11 adopts an L-shaped cross-section. Figure 3a and Figure 3b Hint.

[0085] In some embodiments, the length, sealing, insulation, etc. of the circuitous path are further increased by improving the structure of the housing and / or the conductive metal bar 10 .

[0086] In one example, the conductive metal row 10 is in the form of a plastic-encased shell. Figure 3a This is a schematic diagram of the structure of the conductive metal row 10 without a plastic-encapsulated shell in this application. Figure 3b and Figure 3c Schematic diagram of a structure in which a plastic-coated shell is formed on the conductive metal bar 10. By arranging the plastic-coated shell on the conductive metal bar 10 and setting the interior of the plastic-coated shell to be hollow, the hollow surface inside the plastic-coated shell is used to fit with the outer surface of the outer wall portion 61 of the piston 6, so as to increase the circuitous path and further improve the sealing performance, insulation performance, etc. In addition, the circuitous path added between the plastic-coated shell and the piston further provides more sealing installation positions, which facilitates the improvement of sealing performance and insulation performance by adding more sealing parts.

[0087] refer to Figure 3b and Figure 3c Before or after the conductive metal row 10 is cut off, the plastic-coated shell can be used to wrap the piston 6, which can form an ignition cavity and increase the length of the circuitous path, further improving the sealing and insulation properties. In addition, the shape and size of the plastic-coated shell are not specifically limited.

[0088] In one example, the housing of the circuit breaker may be in the form of a structure in which an upper housing and a lower housing are fixed to each other, or may be in the form of an integral structure.

[0089] refer to Figure 1As shown in the figure, the housing of the circuit breaker includes an upper housing 9 and a lower housing 14 , and the upper housing 9 and the lower housing 14 are fixedly installed by using bolts 16 , an upper metal gasket 1 and a lower metal gasket 15 .

[0090] It should be noted that no matter how the exterior of the high-voltage circuit breaker shell changes (reinforced ribs, reduced material, etc.), and no matter which shell is used to wrap the piston to form the ignition cavity, as long as the interior adopts the insulation, sealing, arc extinguishing and other structures of the aforementioned scheme of this application, it falls within the scope of protection of this application.

[0091] In some embodiments, the conductive metal bar 10 is embedded between the upper shell 9 and the lower shell 14 , and thus a seal may be provided on the lower shell 14 .

[0092] refer to Figure 4 As shown in the figure, a fifth sealing ring 13 is embedded between the lower shell 14 and the conductive metal row 10, and the fifth sealing ring 13 is used to enhance the sealing performance.

[0093] In some examples, the fifth sealing ring 13 can be disposed between the lower end of the plastic-coated shell of the conductive metal row 10 and the upper end of the lower shell 14. Since the fifth sealing ring 13 is located below the fracture of the conductive metal row 10, it can enhance both sealing and insulation.

[0094] In some embodiments, a guide column may be provided to guide the movement of the piston 6 during the movement of the piston 6 .

[0095] During implementation, the shell is also provided with a guide column 141 extending upward from the bottom of the vertical channel, and a hollow first recessed portion 613 is provided below the first protrusion 62. When the piston moves from the initial position to the final position, the guide column 141 engages with the first recessed portion 613 to provide a guiding effect.

[0096] refer to Figure 5a-Figure 5e As shown in FIG. 1 , the guiding and locking fixing structure for the piston 6 is shown as follows: a guide column 141 is provided at the center of the lower shell 14 , and a corresponding first recessed portion 613 is provided at the bottom of the piston 6 .

[0097] Among them, the igniter 3 of the high-voltage circuit breaker explodes and pushes the piston 6 downward, and the piston 6 breaks the conductive metal row 10 to make it into two parts: the first part 10a that is cut and moves downward and the second part 10b with both ends fixed. During the cutting process, the guide pillar at the center of the lower shell 14 and the first recessed part 613 corresponding to the bottom of the piston 6 adopt interference fit, and the axis is perpendicular to the bottom surface.

[0098] In some examples, the guide pillar is used to guide the piston, so as to better guide the piston to move vertically downward, prevent the piston from tilting, and prevent the insulating seals on the sealing path and the insulating path from being damaged, thereby enhancing the sealing and insulating effects.

[0099] In some examples, the piston can be locked at the end of its stroke by utilizing the interference fit between the guide pillar and the groove at the bottom of the piston, preventing the high-voltage circuit breaker from moving away from the end of its stroke toward the starting point of its stroke due to flipping, shaking, etc., thereby reducing the distance between the first part 10a and the second part 10b of the cut-off metal row, thereby reducing the risk of re-arcing at both ends of the cut-off second part 10b.

[0100] In some examples, the guide column 141 may also adopt other preferred structural modes, that is, the cross-sectional shape of the guide column is any one of the following shapes: circular, square, triangular, square, star-shaped, etc.

[0101] For example, referring to the aforementioned Figure 5a , the guide pillar is cylindrical, that is, the cross section is circular; for example, refer to Figure 6a-6b In other examples, the cross section of the pillar can also be triangular, square, star-shaped, etc.

[0102] Correspondingly, a recessed groove having a corresponding cross-sectional shape is provided on the first protruding portion 62 of the piston 6 and the guide pillar, which will not be described in detail.

[0103] In some examples, a barb locking method is also used for the locking structure of the piston 6 and the housing in the final position. In implementation, the guide column 141 has a second protrusion 142, and the top of the first recessed portion 613 is provided with a second groove 614, and the second protrusion 142 cooperates with the second groove 614 to lock the piston and the housing in the final position.

[0104] refer to Figure 6c and Figure 6d As shown, the second protrusion 142 provided on the guide column 141 adopts a barb structure instead, so that the locking between the housing and the piston 6 is achieved through the cooperation of the barb structure, thereby enhancing the locking effect.

[0105] In some embodiments, the housing is further provided with a plurality of arc extinguishing chambers 143, which are located at the periphery of the vertical channel and communicated with the vertical channel through radial channels 144. When the piston 6 is located at the final position, the third sealing ring 8 and / or the fourth sealing ring 11 are located between the fracture of the conductive metal row 10 and the radial channel. By adding arc extinguishing chambers, the arc extinguishing capability is improved.

[0106] In some examples, an arc extinguishing block 12 is further disposed in the arc extinguishing chamber 143 , so that the arc extinguishing block 12 is utilized to further improve the arc extinguishing capability.

[0107] In some embodiments, the short-circuit clip 2 is disposed on the igniter 3, and the short-circuit clip 2 is used to trigger the igniter 3 to perform an ignition action; the igniter 3 is installed in the housing of the circuit breaker through the igniter housing 4, and the igniter 3 is wrapped by the igniter housing 4. The wrapping can be preferably a general sealing process, such as a plastic coating process, or glue potting, or a sealing member with sufficient sealing performance is used as the igniter housing 4 to wrap the igniter 3, so that the igniter 3 and the igniter housing 4 can be nearly regarded as an absolute sealing performance.

[0108] See Figure Figure 2a , Figure 7a and Figure 7b As shown, a mounting structure for accommodating the igniter 3 and / or the short-circuit clip 2 is provided at one end of the igniter housing 4 , so as to facilitate the installation of the igniter 3 and the short-circuit clip 2 on the igniter housing 4 .

[0109] In this specification, the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments described later, the description is relatively simple, and the relevant parts can be referred to the partial description of the previous embodiments.

[0110] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A pyrotechnic circuit breaker, comprising: An igniter, an igniter housing, a piston, a conductive metal row and a shell, wherein a vertical channel is formed in the shell, the igniter housing is fixed at one end of the vertical channel, the conductive metal row at least partially extends into the vertical channel, the piston is movably arranged in the vertical channel, and when the igniter is actuated, it can move between an initial position close to the igniter housing and a final position at the other end of the vertical channel to cut off the conductive metal row, characterized in that the igniter housing includes a ring arm extending toward the vertical channel, the piston is sleeved on the ring arm, includes an outer wall portion circumferentially abutting against the outer surface of the ring arm and a first protrusion extending into the internal hollow space of the ring arm, the first protrusion circumferentially abutting against the inner surface of the ring arm, the igniter is placed in the ring arm and opposite to the top surface of the first protrusion, and a circuitous sealing path and / or insulating path is formed between the fracture of the conductive metal row and the igniter.

2. The pyrotechnic circuit breaker according to claim 1, characterized in that: A first sealing ring is provided between the vertical channel and the outer wall portion, and a second sealing ring is provided between the outer wall portion and the ring arm. When the piston is located at the final position, the first sealing ring is located above the fracture of the conductive metal row, and the second sealing ring is located near the end of the outer wall portion and / or the ring arm; And / or, a third sealing ring is further provided between the vertical channel and the outer wall portion, and when the piston is located at the final position, the third sealing ring is placed below the fracture of the conductive metal row, And / or, a fourth sealing ring is nested on the vertical channel below the conductive metal row, and when the piston is located at the final position, the fourth sealing ring abuts against the outer surface of the outer wall portion.

3. The pyrotechnic circuit breaker according to claim 2, characterized in that: The outer surface of the outer wall portion is formed with a first circumferential groove and a third circumferential groove, which are respectively used to sleeve the first sealing ring and the third sealing ring. The outer surface of the ring arm is provided with a second circumferential groove, which is used to sleeve the second sealing ring. The inner surface of the vertical channel is formed with a fourth circumferential groove, which is used to nest the fourth sealing ring.

4. The pyrotechnic circuit breaker according to claim 2, characterized in that: A plurality of arc extinguishing chambers are also provided in the shell, which are located at the periphery of the vertical channel and connected with the vertical channel through a radial channel. When the piston is located at the final position, the third sealing ring and / or the fourth sealing ring is located between the fracture of the conductive metal row and the radial channel.

5. The pyrotechnic circuit breaker according to any one of claims 1 to 4, characterized in that: The shell is also provided with a guide column extending upward from the bottom of the vertical channel, and a hollow first recessed portion is provided below the first protrusion. When the piston moves from the initial position to the final position, the guide column engages with the first recessed portion to provide a guiding function.

6. The pyrotechnic circuit breaker according to claim 5, characterized in that: The guide column is interference-fitted with the first recessed portion to lock the piston in the final position; And / or, the first recessed portion is a star-shaped structure, and the cross-section of the guide column is any one of an oblate, triangular, square and star-shaped.

7. The pyrotechnic circuit breaker according to claim 5, characterized in that: The guide column is provided with a second protrusion, the first recessed portion is provided with a second groove, and the second protrusion cooperates with the second groove to lock the piston and the housing at the final position.

8. The pyrotechnic circuit breaker according to claim 5, characterized in that The shell includes an upper shell and a lower shell, the conductive metal row is installed between the upper shell and the lower shell, and the vertical channel extends from one end of the upper shell to the bottom of the lower shell, and the upper shell and the lower shell are fixed by mounting bolts.

9. The pyrotechnic circuit breaker according to claim 5, characterized in that: The conductive metal row is provided with a plastic-coated shell, the interior of the plastic-coated shell is hollow, and the hollow surface inside the plastic-coated shell is in contact with the outer surface of the outer wall.

10. The pyrotechnic circuit breaker according to claim 5, characterized in that The igniter is wrapped and sealed by the igniter housing, and the sealing process includes any one of the following processes: plastic wrapping, glue pouring, and sealing.

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