Fast arc extinguishing excitation fuse, electronic circuit and electronic equipment

Abstract

The present application provides a fast arc extinguishing excitation fuse, an electronic circuit and an electronic device, comprising an upper shell, a lower shell and a conductive component, wherein a piston portion is provided in the upper shell and the lower shell, and at least one arc extinguishing chamber is further provided in the lower shell, and each arc extinguishing chamber is provided with an arc extinguishing medium; a fuse portion is provided on the conductive component, the conductive component is inserted into the upper shell and / or the lower shell, and the fuse portion is wrapped in the arc extinguishing medium of each arc extinguishing chamber; the piston portion comprises an active cavity and an impact member, when the fuse portion is fused, the impact member is triggered and impacts the conductive component along the active cavity to disconnect the fuse portion; a metal mesh portion is provided at one end of the active cavity along the impact direction of the impact member, and the metal mesh portion extinguishes the arc when the fuse portion is disconnected to generate an arc and the arc is ejected from the arc extinguishing chamber into the active cavity. In this way, the arc is decomposed by directly providing the metal mesh portion at the end of the active cavity, thereby achieving rapid arc extinguishing.

Description

Technical Field

[0001] The present application belongs to the technical field of excitation fuses, and in particular relates to a fast arc-extinguishing excitation fuse, an electronic circuit and an electronic device. Background Art

[0002] At present, the structure of the excitation fuse on the market mainly includes a gas generating device, a conductive component and various arc extinguishing structures. When an abnormality occurs in the equipment, the gas generating device generates high-pressure gas to drive the piston to break the conductive component, and bring the cut metal segment of the conductive component into the large space cavity set under the piston, through which the metal segment is separated from the conductive component body to achieve arc extinguishing. However, this method makes the size of the excitation fuse too large. Summary of the invention

[0003] The present application provides a fast arc-extinguishing excitation fuse, an electronic circuit and an electronic device, in order to reduce the volume of the excitation fuse.

[0004] In a first aspect, the present application provides a fast arc extinguishing excitation fuse, comprising an upper housing, a lower housing and a conductive component.

[0005] The upper shell and the lower shell are provided with piston parts, and the lower shell is also provided with at least one arc extinguishing chamber, and each arc extinguishing chamber of the at least one arc extinguishing chamber is provided with an arc extinguishing medium;

[0006] The conductive component is provided with a fuse part, the conductive component is inserted into the upper shell and / or the lower shell, and the fuse part is wrapped in the arc extinguishing medium of each arc extinguishing chamber;

[0007] The piston part includes an active cavity and an impact piece. When the fuse part is fused, the impact piece is triggered and impacts the conductive component along the active cavity to disconnect the fuse part.

[0008] A metal mesh portion is provided at one end of the active cavity along the impact direction of the impact member, and the metal mesh portion extinguishes the arc when the fuse is disconnected to generate an arc and the arc is ejected from the arc extinguishing chamber into the active cavity.

[0009] In a second aspect, the present application provides an electronic circuit, comprising the fast arc extinguishing excitation fuse as described in the first aspect.

[0010] In a third aspect, the present application provides an electronic device, comprising the fast arc extinguishing excitation fuse as described in the first aspect, or the electronic circuit as described in the second aspect.

[0011] It can be seen that in the present application, the fast arc extinguishing excitation fuse includes an upper shell, a lower shell and a conductive component, a piston part is provided in the upper shell and the lower shell, and at least one arc extinguishing chamber is also provided in the lower shell, and each arc extinguishing chamber in the at least one arc extinguishing chamber is provided with an arc extinguishing medium; a fuse part is provided on the conductive component, the conductive component is inserted in the upper shell and / or the lower shell, and the fuse part is wrapped in the arc extinguishing medium of each arc extinguishing chamber; the piston part includes an active cavity and an impact piece, when the fuse part is fused, the impact piece is triggered and impacts the conductive component along the active cavity to disconnect the fuse part; a metal mesh part is provided at one end of the active cavity along the impact direction of the impact piece, and the metal mesh part extinguishes the arc when the fuse part is disconnected to generate an arc and the arc is ejected from the arc extinguishing chamber into the active cavity. In this way, the arc is decomposed by directly providing a metal mesh part at the end of the active cavity, thereby achieving rapid arc extinguishing, and no large space cavity is required, thereby reducing the volume of the fast arc extinguishing excitation fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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.

[0013] Figure 1 It is a structural schematic diagram of a first fast arc-extinguishing fuse provided in an embodiment of the present application;

[0014] Figure 2 This is a schematic diagram of the structure of the first fast arc-extinguishing fuse after it is blown, provided in an embodiment of the present application;

[0015] Figure 3 It is a structural schematic diagram of an active cavity of a fast arc-extinguishing fuse provided in an embodiment of the present application;

[0016] Figure 4 It is a structural schematic diagram of a metal mesh portion provided in an embodiment of the present application;

[0017] Figure 5 It is a structural schematic diagram of a second fast arc-extinguishing fuse provided in an embodiment of the present application;

[0018] Figure 6 It is a structural schematic diagram of a third fast arc-extinguishing fuse provided in an embodiment of the present application;

[0019] Figure 7 This is a schematic diagram of the structure of the third fast arc-extinguishing fuse after it is blown provided in an embodiment of the present application;

[0020] Figure 8It is a schematic diagram of the magnetic field action direction and arc blowing direction provided in the embodiment of the present application;

[0021] Fig. 9 It is a schematic diagram of the structure of the electronic circuit provided in the embodiment of the present application. DETAILED DESCRIPTION

[0022] 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 are within the scope of protection of this application.

[0023] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, systems, products or devices.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] At present, the structure of the excitation fuse on the market mainly includes a gas generating device, a conductive component and various arc extinguishing structures. When an abnormality occurs in the equipment, the gas generating device generates high-pressure gas to drive the piston to break the conductive component, and bring the cut metal segment of the conductive component into the large space cavity set under the piston, through which the metal segment is separated from the conductive component body to achieve arc extinguishing. However, this method makes the size of the excitation fuse too large.

[0026] To solve the above problems, the embodiment of the present application provides a fast arc extinguishing excitation fuse. The fast arc extinguishing excitation fuse can be applied to the scenario of fast arc extinguishing of the excitation fuse. The fast arc extinguishing excitation fuse includes an upper shell, a lower shell and a conductive component, a piston portion is provided in the upper shell and the lower shell, and at least one arc extinguishing chamber is also provided in the lower shell, and each arc extinguishing chamber in the at least one arc extinguishing chamber is provided with an arc extinguishing medium; a fuse portion is provided on the conductive component, the conductive component is inserted in the upper shell and / or the lower shell, and the fuse portion is wrapped in the arc extinguishing medium of each arc extinguishing chamber; the piston portion includes an active cavity and an impact member, when the fuse portion is fused, the impact member is triggered and impacts the conductive component along the active cavity to disconnect the fuse portion; a metal mesh portion is provided at one end of the active cavity along the impact direction of the impact member, and the metal mesh portion extinguishes the arc when the fuse portion is disconnected to generate an arc and the arc is sprayed from the arc extinguishing chamber into the active cavity. In this way, the arc is decomposed by directly setting a metal mesh at the end of the active cavity, thereby achieving rapid arc extinguishing, and no large space cavity is required, thereby reducing the volume of the rapid arc extinguishing excitation fuse. This solution can be applied to a variety of scenarios, including but not limited to the application scenarios mentioned above.

[0027] The specific structure is introduced in detail below.

[0028] See also Figure 1 The present application provides a fast arc extinguishing excitation fuse, comprising an upper shell 10, a lower shell 30 and a conductive component 20, wherein the upper shell 10 and the lower shell 30 are provided with a piston portion, and the lower shell 30 is also provided with at least one arc extinguishing chamber, and each of the at least one arc extinguishing chamber is provided with an arc extinguishing medium; a fuse portion is provided on the conductive component 20, and the conductive component 20 is inserted into the upper shell 10 and / or the lower shell 30, and the fuse portion is wrapped in the arc extinguishing medium of each arc extinguishing chamber; the piston portion comprises an active cavity and an impact member 71, and when the fuse portion is fused, the impact member 71 is triggered and impacts the conductive component 20 along the active cavity to disconnect the fuse portion; a metal mesh portion 60 is provided at one end of the active cavity along the impact direction of the impact member 71, and the metal mesh portion 60 extinguishes the arc when the fuse portion is disconnected to generate an arc and the arc is ejected from the arc extinguishing chamber into the active cavity.

[0029] In the specific implementation, Figure 1 and Figure 2As shown, the upper shell 10 and the lower shell 30 are combined to form the shell of the entire fast arc-extinguishing fuse, which protects the inside of the fast arc-extinguishing fuse. The upper shell 10 and the lower shell 30 are formed by injection molding or other processes, and a channel for the conductive component 20 to pass through can be formed in the lower shell 30 to fix the conductive component 20 in the upper shell 10 or the lower shell 30; or, a first card groove is formed on the end face of the upper shell 10 and a second card groove is formed on the end face of the lower shell 30 respectively. When the upper shell 10 and the lower shell 30 are combined, the first card groove and the second card groove form a channel for the conductive component 20 to pass through, so as to firmly lock the conductive component 20 between the upper shell 10 and the lower shell 30. In addition, a penetration cavity is opened in each of the upper shell 10 and the lower shell 30, and the two penetration cavities form an active cavity of the piston part after the upper shell 10 and the lower shell 30 are combined.

[0030] Please also refer to Figure 3 The active chamber includes an upper active chamber 72 and a lower active chamber. The upper active chamber 72 is arranged in the upper shell 10 and penetrates the upper shell 10, and the lower active chamber is arranged in the lower shell 30; the lower active chamber includes a first sub-chamber 73 and a second sub-chamber 74. The size of the upper active chamber 72 is smaller than the first sub-chamber 73, and the size of the first sub-chamber 73 is smaller than the second sub-chamber 74; the first sub-chamber 73 is connected to the upper active chamber 72 and forms a first step with the upper active chamber 72 through the upper shell 10; the second sub-chamber 74 is connected to the first sub-chamber 73 and forms a second step with the first sub-chamber 73 through the lower shell 30; wherein the conductive component 20 rests under the second step. The upper active chamber 72, the first sub-chamber 73 and the second sub-chamber 74 constitute an active chamber that increases in size from small to large.

[0031] Specifically, the impact member 71 includes a rod-shaped portion and a hammer head; when the impact member 71 is not triggered, the rod-shaped portion is accommodated in the upper active cavity 72, and the shape and size of the rod-shaped portion are adapted to the upper active cavity 72; the hammer head is accommodated in the first sub-chamber 73, and the shape and size of the hammer head are adapted to the first sub-chamber 73; when the impact member 71 is accommodated in the upper active cavity 72 and the first sub-chamber 73 and is not triggered, the hammer head rests on the conductive component 20.

[0032] When the impact piece 71 is accommodated in the active cavity, it is in close contact with the cavity wall of the active cavity, leaving only a small gap (for example, a gap of 0.1-0.5 mm wide) to reduce the friction between the impact piece 71 and the active cavity, while limiting the space of the active cavity to a smaller range. In this embodiment, in addition to the active cavity, there are no other active cavities through which gas can pass in the fast arc extinguishing excitation fuse, so that the volume of the fast arc extinguishing excitation fuse is compressed within a very small range, thereby greatly reducing the volume of the fast arc extinguishing excitation fuse.

[0033] Furthermore, the conductive component 20 can pass through the housing in a variety of ways. For example, it can pass through one end of the upper housing 10, then pass through the lower housing 30, pass through the arc extinguishing cavity and the lower active cavity, and then pass back from the lower housing 30 to the other end of the upper housing 10 and pass out, and reserve electrodes of preset lengths at both ends of the upper housing 10, and connect with the electronic circuit through the electrodes. Alternatively, the conductive component 20 passes through one end of the lower housing 30, passes directly through the arc extinguishing cavity and the lower active cavity, and then passes through the other end of the lower housing 30, and reserve electrodes of preset lengths at both ends of the lower housing 30, and connect with the electronic circuit outside the fast arc extinguishing excitation fuse through the electrodes. Alternatively, the conductive component 20 passes through one end of the connection between the upper housing 10 and the lower housing 30, then passes through the arc extinguishing cavity and the lower active cavity from the lower housing 30, and finally passes back from the lower housing 30 to the other end of the connection, and reserve electrodes of preset lengths at both ends of the upper housing 10, and connect with the electronic circuit through the electrodes.

[0034] In a possible embodiment, two arc extinguishing chambers are provided in the fast arc extinguishing excitation fuse, namely, a first arc extinguishing chamber 41 and a second arc extinguishing chamber 42, wherein the first chamber is provided on the first side of the lower shell 30, and the second chamber is provided on the second side of the lower shell 30; wherein the first side and the second side are opposite sides, such as the left side and the right side, the upper side and the lower side, etc., which are not limited here. An active chamber is provided between the first chamber and the second chamber, specifically, a lower active chamber. Only gaps are left on the left and right side walls of the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42 for the conductive component 20 to pass through, and the conductive component 20 passes through the gap in sequence. Specifically, the conductive component 20 enters from one side of the first arc extinguishing chamber 41, exits from the other side of the first arc extinguishing chamber 41, then passes through the lower active chamber, enters from one side of the second arc extinguishing chamber 42, and then exits from the other side of the second arc extinguishing chamber 42. The conductive component 20 in the first arc extinguishing chamber 41 includes a first fuse, and the conductive component 20 in the second arc extinguishing wall includes a second fuse. The first fuse and the second fuse are configured to be fused when the current is greater than a preset value. The first arc extinguishing chamber 41 is filled with a first arc extinguishing medium 51, which is a solid granular or colloidal material that wraps the first fuse; the second arc extinguishing chamber 42 is filled with a second arc extinguishing medium 52, which is a solid granular or colloidal material that wraps the second fuse. The first arc extinguishing medium 51 and the second arc extinguishing medium 52 are used to limit the free expansion of the arc diameter, increase the arc voltage, and thus cause the arc to extinguish.

[0035] Wherein, at least one fuse point is provided on the first fuse part and the second fuse part, such as Figure 1 , Figure 3 and Figure 5 As shown, in this embodiment, the first fuse portion includes a first tensile weak point 21, a first fuse weak point 221 and a second fuse weak point 222, and the second fuse portion includes a second tensile weak point 22, a third fuse weak point 223 and a fourth fuse weak point 224. The sizes (such as width) of the first fuse weak point 221, the second fuse weak point 222, the third fuse weak point 223 and the fourth fuse weak point 224 are smaller than the parts of the conductive component 20 except the fuse portion. More preferably, the sizes of the first fuse weak point 221, the second fuse weak point 222, the third fuse weak point 223 and the fourth fuse weak point 224 may be the same or different.

[0036] For specific implementation, please continue to refer to Figure 2 The tensile weak point and the fusing weak point formed in the fuse part are located at approximately the middle of the arc extinguishing chamber, so that when an abnormality occurs, at least one of the tensile weak point and the fusing weak point is broken, so that the conductive component 20 is broken, and the conductor 23 (such as Figure 2 and Figure 7As the impact member 71 moves downward, it is quickly pulled downward until it reaches the metal mesh portion 60. When the impact member 71 moves to touch the metal mesh portion 60 at the bottom of the lower housing 30, the breakpoint of the conductive component 20 is still partially retained in the arc extinguishing chamber, so as to prevent a large amount of metal ions in the arc from entering the active cavity after the conductive component 20 is completely pulled out of the arc extinguishing chamber, thereby making it difficult to extinguish the arc.

[0037] It can be seen that in this embodiment, the metal mesh portion 60 is directly provided at the end of the active cavity to decompose the arc, thereby achieving rapid arc extinguishing. Therefore, there is no need to provide a large space cavity, thereby reducing the volume of the rapid arc extinguishing excitation fuse.

[0038] In a possible embodiment, the metal mesh portion 60 includes at least three layers of arc-extinguishing meshes 61 stacked together, and arc-extinguishing mesh holes are distributed in each layer of the arc-extinguishing mesh 61 .

[0039] In a specific implementation, the metal mesh portion 60 is composed of at least 3 stainless steel meshes (i.e., arc extinguishing meshes 61) with mesh sizes between 50 and 200. The mesh sizes of each stainless steel mesh can be the same or different. The mesh holes between the different stainless steel meshes are staggered and arranged in a disordered manner, and the mesh holes are not required to be aligned.

[0040] In a possible embodiment, the metal mesh portion 60 includes channels arranged according to a preset rule; wherein the channels are arranged longitudinally, or the channels are arranged transversely, or the channels are arranged in a disordered manner. Transverse arrangement means that strip-shaped channels are arranged on each layer of arc-extinguishing mesh 61, that is, the mesh extends transversely into strips; longitudinal arrangement means that the channels of the mesh extend vertically toward the adjacent arc-extinguishing mesh 61.

[0041] In a possible embodiment, the metal mesh portion 60 further includes at least one supporting connection portion; each supporting connection portion is disposed between two adjacent layers of arc-extinguishing meshes 61 and is respectively connected to the two adjacent layers of arc-extinguishing meshes 61 .

[0042] In this embodiment, each supporting connection part is arranged between two adjacent layers of arc extinguishing nets 61. The supporting connection part can be a supporting column, which is respectively arranged at the four corners and the center position of two adjacent layers of arc extinguishing nets 61 to connect the two adjacent layers of arc extinguishing nets 61 so that the multiple layers of arc extinguishing nets 61 form a whole, and at the same time separate the two adjacent layers of arc extinguishing nets 61 by a certain distance.

[0043] Optionally, the support column can be made of metal or insulating material, and the insulating material includes but is not limited to adhesive or insulating glue. When the impact member 71 moves downward due to severe ablation of the conductive component 20, and the ablated fracture of the broken conductor 23 is pulled out of the arc extinguishing chamber, the arc will move downward with the impact member under the influence of gas pressure and enter the metal mesh part 60, and the arc will be quickly extinguished by cooling the metal mesh part 60 and stretching the arc.

[0044] In one possible embodiment, see Figure 4 The metal mesh portion 60 includes an arc-extinguishing layer 62, and each arc-extinguishing layer 62 is arranged between two adjacent arc-extinguishing meshes 61; the arc-extinguishing layer 62 includes one or more of liquid silicone, polyamide resin, silicone resin, and organic silicone resin.

[0045] In the specific implementation, the present embodiment does not provide a supporting connection portion, but provides an arc-extinguishing layer 62 between two adjacent layers of arc-extinguishing nets 61. The material in the arc-extinguishing layer 62 is a colloid adhesive, which can bond two adjacent layers of arc-extinguishing nets 61 together, so that the multiple layers of arc-extinguishing nets 61 form a whole. The arc-extinguishing layer 62 is made of organic materials such as liquid silicone, polyamide resin, silicone resin, and organic silicone resin that can generate arc-extinguishing gas under high temperature or electric arc, and is spread on the surface of each layer of arc-extinguishing net 61 to separate two adjacent layers of arc-extinguishing nets 61, so that the metal mesh part 60 has the function of an arc-extinguishing grid, and the arc-extinguishing layer 62 provided thereon can also absorb heat and generate arc-extinguishing gas under the action of electric arc and high temperature, thereby further improving the arc-extinguishing effect of the metal mesh part 60.

[0046] The arc extinguishing principle of the fast arc extinguishing excitation fuse in the present application is described in detail below: When the driving device of the fast arc extinguishing excitation fuse receives an external excitation signal to drive the impact member 71 to move downward to impact the conductive component 20, due to the tensile force and the influence of the current, at least one of the tensile weak points and the fusing weak points on the conductive component 20 is disconnected first, and an arc is formed at the fracture position. Since the conductive component 20 is surrounded by an arc extinguishing medium, the newly formed arc can only burn in the channel left by the disconnection of the conductive component 20, and it is difficult to expand to both sides, and the arc voltage is high; as the impact member continues to move downward, the fracture spacing of the broken conductor 23 is rapidly lengthened, so that the arc is rapidly lengthened, and the arc voltage increases rapidly; the impact member stops after moving to the metal mesh part 60 at the bottom of the lower shell 30, and the metal ions overflowing to the middle of the lower shell 30 are adsorbed and cooled by the stainless steel mesh in the metal mesh part 60 as the impact member moves to the metal mesh part 60 and extinguished.

[0047] In one possible embodiment, see Figure 5-Figure 7The first cavity wall and the second cavity wall in the arc extinguishing chamber are respectively provided with a first sealing gasket 81 and a second sealing gasket 82; the first cavity wall, the second cavity wall, the first sealing gasket 81 and the second sealing gasket 82 are all provided with a first through hole adapted to the conductive component 20; the conductive component 20 passes through the first cavity wall, the first sealing gasket 81, the second sealing gasket 82 and the first through hole on the second cavity wall in sequence to pass through the arc extinguishing chamber.

[0048] In a specific implementation, a first sealing gasket 81 and a second sealing gasket 82 are respectively arranged on the first cavity wall and the second cavity wall of the lower shell 30 passing through the conductive component 20 to prevent the arc generated when the conductive component 20 is disconnected from burning the inner wall of the corresponding arc extinguishing chamber, or the arc is easily ejected from the gap passing through the conductive component 20, causing poor disconnection.

[0049] Optionally, the first sealing gasket 81 and the second sealing gasket 82 are preferably made of materials such as silicone rubber with adhesive backing, polyimide resin, etc., to form a gasket with a thickness of 0.3~2.0mm. The first sealing gasket 81 and the second sealing gasket 82 are respectively pasted on the first cavity wall and the second cavity wall, and the width of the first through hole set at the position where the conductive component 20 passes through the first sealing gasket 81 and the second sealing gasket 82 is smaller than the thickness of the conductive component 20; since the first sealing gasket 81 and the second sealing gasket 82 are elastic, although the size of the conductive component 20 is larger than the size of the first through hole, it can still pass through the first through hole; under such a setting, when the conductive component 20 passes through the first cavity wall and the second cavity wall through the first through hole, an interference fit is formed and the two end positions are well sealed.

[0050] In one possible embodiment, please refer to Figure 6 and Figure 7 The fast arc extinguishing excitation fuse also includes a first arc blowing layer and a second arc blowing layer, and the first arc blowing layer and the second arc blowing layer are respectively arranged on both sides outside the arc extinguishing chamber and parallel to the conductive component 20 passing through the arc extinguishing chamber; when the fuse part is blown, a repulsive force is generated between the first arc blowing layer and the second arc blowing layer to extinguish the arc generated by the fuse part.

[0051] In a specific implementation, continuing to take the above-mentioned first arc extinguishing chamber 41 and second arc extinguishing chamber 42 as an example, a first sub-arc blowing layer 91 and a second sub-arc blowing layer 92 are respectively arranged on both sides of the first arc extinguishing chamber 41 parallel to the conductive component 20 passing through the arc extinguishing chamber, and a third sub-arc blowing layer 93 and a fourth sub-arc blowing layer 94 are respectively arranged on both sides of the second arc extinguishing chamber 42 parallel to the conductive component 20 passing through the arc extinguishing chamber, wherein the first arc blowing layer includes the first sub-arc blowing layer 91 and the third sub-arc blowing layer 93, and the second arc blowing layer includes the second sub-arc blowing layer 92 and the fourth sub-arc blowing layer 94. The first sub-arc blowing layer 91, the second sub-arc blowing layer 92, the third sub-arc blowing layer 93 and the fourth sub-arc blowing layer 94 are all magnetic, and can be any one of a magnet, an electromagnet, a permanent magnet, or other materials that can generate a stable magnetic field. Among them, the polarity between the first sub-arc blowing layer 91 and the third sub-arc blowing layer 93 is opposite, and the polarity between the second sub-arc blowing layer 92 and the fourth sub-arc blowing layer 94 is opposite, so as to form a magnetic field in the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42; when an arc is generated in the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42, the magnetic field produces a magnetic blowing arc extinguishing effect on the arc, thereby accelerating the arc extinguishing speed in the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42.

[0052] Furthermore, a first shielding layer and a second shielding layer may be respectively provided on the side of the first sub-arc layer 91 and the second sub-arc layer 92 opposite to the first arc extinguishing chamber 41, and a third shielding layer and a fourth shielding layer may be respectively provided on the side of the third sub-arc layer 93 and the fourth sub-arc layer 94 opposite to the second arc extinguishing chamber 42, so as to prevent the magnetic field generated by the first sub-arc layer 91, the second sub-arc layer 92, the third sub-arc layer 93 and the fourth sub-arc layer 94 from affecting the surrounding environment. The first shielding layer, the second shielding layer, the third shielding layer and the fourth shielding layer may be made of silicon steel sheets, soft iron and the like, and the first shielding layer, the second shielding layer, the third shielding layer and the fourth shielding layer may be coated therein.

[0053] See also Figure 8 , the direction of action of the magnetic field in the first arc blowing layer and the second arc blowing layer, as well as the direction of movement of the arc under the magnetic force of the magnetic field are given. The direction of action of the electromagnetic field in the first arc blowing layer and the second arc blowing layer is from the N pole to the S pole of the magnet, so that the direction of the electromagnetic force on the charged particles in the arc is perpendicular to the direction of movement of the arc, which tends to pull the charged particles in the arc away from the arc column area, thereby accelerating the diffusion of the arc in its radial direction, and further improving the arc extinguishing effect of the arc extinguishing medium in the arc extinguishing chamber.

[0054] Combine the following Figure 8The arc extinguishing principle of the arc extinguishing structure of the excitation fuse described in the present invention is explained in detail as follows: when the driving device of the rapid arc extinguishing excitation fuse receives an external excitation signal to drive the impact piece 71 to move downward to hit the conductive component 20, due to the influence of the pulling force and the current, at least one of the tensile weak points and the fusing weak points on the conductive component 20 is disconnected first, and an arc is formed at the fracture position. Since the conductive component 20 is surrounded by an arc-extinguishing medium, the newly formed arc can only burn in the channel left by the disconnection of the conductive component 20, and it is difficult to expand to both sides, and the arc voltage is relatively high; as the impact component continues to move downward, the fracture spacing of the conductive component 20 is rapidly lengthened, so that the arc is rapidly lengthened, and the arc voltage increases rapidly; and due to the existence of the first arc-blowing layer and the second arc-blowing layer on the two side walls of the lower shell 30, an electromagnetic force perpendicular to the movement direction of the conductive component 20 is formed inside the arc-extinguishing chamber. After being acted upon by the electromagnetic force, the charged particles in the arc are accelerated to diffuse in the radial direction of the arc along the gaps in the arc-extinguishing medium, thereby enhancing the cooling effect of the arc-extinguishing medium on the arc; the impact component stops after moving to the metal mesh portion 60 at the bottom of the lower shell 30, and the metal ions overflowing to the middle of the lower shell 30 are adsorbed and cooled by the stainless steel mesh in the metal mesh portion 60 as the impact component moves to the metal mesh portion 60 and are extinguished.

[0055] In a possible embodiment, an arc-extinguishing spray chamber is provided on the impact member 71, and the arc-extinguishing spray chamber is a penetrating chamber. A first sealing layer and a second sealing layer are provided in the arc-extinguishing spray chamber, and the arc-extinguishing spray chamber is filled with an arc-extinguishing medium. When the impact member 71 is triggered, the first sealing layer is pushed and broken by the high-pressure gas, and then the high-pressure gas pushes the arc-extinguishing medium to break the second sealing layer, so that the arc-extinguishing medium is ejected from the arc-extinguishing spray chamber.

[0056] In a specific implementation, the arc extinguishing medium in the arc extinguishing spray chamber is a loose sand structure or a fluid structure, which is not limited here. When the driving device of the fast arc extinguishing excitation fuse receives an external excitation signal and generates high-pressure gas to drive the impact member 71 to move downward to hit the conductive component 20, the high-pressure gas simultaneously breaks through the first sealing layer, and then pushes the arc extinguishing medium in the arc extinguishing spray chamber to break through the second sealing layer, and then sprays out from the arc extinguishing spray chamber; in this process, the impact member 71 breaks the conductive component 20 and pulls it to the second sub-chamber in the lower active chamber; at this time, the arc extinguishing medium in the arc extinguishing spray chamber sprays out and fills the second sub-chamber, so that the metal ions overflowing into the second sub-chamber are quickly blown away, cooled and extinguished.

[0057] When the second sub-chamber is provided with a metal mesh portion 60, the metal mesh portion 60 can also be used to further accelerate the cooling and extinguishing speed of the metal ions, thereby improving the arc extinguishing speed of the fast arc extinguishing excitation fuse.

[0058] The present application also provides an electronic circuit, comprising the excitation fuse described in the embodiments of the present application.

[0059] In a specific implementation, the excitation fuse is connected in series in the electronic circuit as an emergency protection device in the electronic circuit. It can be connected in series between the power supply and the power-consuming circuit, or it can be set between the back-end circuit and the front-end circuit that need to be protected. When the current in the circuit is too large, the metal melt in the excitation fuse is melted, and at the same time, the impact piece is controlled by the excitation signal to impact the metal melt, thereby accelerating the breaking of the metal melt.

[0060] In one possible embodiment, see Fig. 9 The electronic circuit 100 includes a power supply 110, an excitation fuse 120, at least one electrical appliance 130, and a controller 140. The excitation fuse 120 is connected to the power supply 110 and the at least one electrical appliance 130 through a power bus, and the controller 140 is respectively connected to the power supply 110, the excitation fuse 120, and the electrical appliance 130. The controller 140 is used to output a first control signal to the excitation fuse 120 according to a control strategy, and to send a second control signal to the excitation fuse 120 when a forced reset operation of the excitation fuse 120 needs to be performed.

[0061] The controller may be a controller in a vehicle-mounted terminal or a controller in other devices, and is used to perform corresponding processing according to some signals in the electronic circuit, for example, detecting the power bus current to generate a corresponding control signal to the excitation fuse 120 .

[0062] In a specific implementation, the control strategy of the controller may be a corresponding instruction generated by a user operating a vehicle-mounted terminal, or may be an instruction generated by the self-operation of the electronic circuit 100 (for example, a corresponding instruction generated by detecting power supply status, electrical appliance status, and other working conditions). That is, when the current in the electronic circuit 100 is greater than a preset value, a control signal is sent to the impact piece of the energizing fuse to cut off all or part of the current in the electronic circuit 100.

[0063] In addition, the electronic circuit 100 may also be a charging circuit in a charging pile, or in other application scenarios that require a large current, and no unique limitation is made here.

[0064] The present application also provides an electronic device, including the fast arc extinguishing excitation fuse described in the embodiment of the present application, or including the electronic circuit 100 described in the embodiment of the present application. The electronic device can be an on-board electronic system, a charging pile, or other equipment that requires a large current, which is not limited to uniqueness here.

[0065] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions without departing from the spirit and scope of the present invention, and can make various changes and modifications, including the combination of the above-mentioned different functions and implementation steps, including software and hardware implementation methods, all of which are within the scope of protection of the present invention.

Claims

1. A fast arc extinguishing excitation fuse, characterized in that: It includes an upper shell, a lower shell and a conductive part, The upper shell and the lower shell are provided with piston parts, and the lower shell is further provided with a first arc extinguishing chamber and a second arc extinguishing chamber, the first chamber is provided on a first side of the lower shell, the second chamber is provided on a second side of the lower shell, and an active chamber is provided between the first chamber and the second chamber, specifically a lower active chamber; only gaps are left on the left and right side walls of the first arc extinguishing chamber and the second arc extinguishing chamber so that conductive components can pass through, and the conductive components pass through the gaps in sequence; The conductive component in the first arc extinguishing chamber includes a first fuse part, and the conductive component in the second arc extinguishing chamber includes a second fuse part, and the first fuse part and the second fuse part are configured to be fused when the current is greater than a preset value; the first arc extinguishing chamber is filled with a first arc extinguishing medium, and the first arc extinguishing medium wraps the first fuse part; the second arc extinguishing chamber is filled with a second arc extinguishing medium, and the second arc extinguishing medium wraps the second fuse part; The piston part includes an active cavity and an impact piece. When the fuse part is fused, the impact piece is triggered and impacts the conductive component along the active cavity to disconnect the fuse part. A metal mesh portion is provided at one end of the active cavity along the impact direction of the impact member, and the metal mesh portion extinguishes the arc when the fuse is disconnected to generate an arc and the arc is sprayed from the arc extinguishing chamber into the active cavity; the metal mesh portion includes at least three layers of arc extinguishing mesh arranged in a stacked manner, and arc extinguishing mesh holes are distributed in each layer of arc extinguishing mesh; the metal mesh portion includes channels arranged according to a preset rule; wherein the channels are arranged longitudinally, or the channels are arranged transversely, or the channels are arranged in an unordered manner; the transverse arrangement is to arrange strip-shaped channels on each layer of arc extinguishing mesh, that is, the mesh holes extend transversely into strips; the longitudinal arrangement means that the channels of the mesh holes extend vertically toward the adjacent arc extinguishing meshes; the metal mesh portion also includes at least one supporting connection portion and an arc extinguishing layer; each supporting connection portion is arranged between two adjacent layers of arc extinguishing meshes, and is respectively connected to the two adjacent layers of arc extinguishing meshes; each arc extinguishing layer is arranged between two adjacent layers of arc extinguishing meshes; the arc extinguishing layer includes one or more of liquid silicone, polyamide resin, silicone resin, and organic silicone resin; The first fuse part includes a first tensile weak point, a first fuse weak point and a second fuse weak point, and the second fuse part includes a second tensile weak point, a third fuse weak point and a fourth fuse weak point; when an abnormality occurs, at least one of the first tensile weak point, the first fuse weak point and the second fuse weak point is broken, and at least one of the second tensile weak point, the third fuse weak point and the fourth fuse weak point is broken, so that the conductive component is broken, and the broken conductor is quickly pulled downward as the impact member moves downward until it reaches the metal mesh part; An arc-extinguishing spray cavity is provided on the impact member, the arc-extinguishing spray cavity is a penetration cavity, a first sealing layer and a second sealing layer are provided in the arc-extinguishing spray cavity, and the arc-extinguishing spray cavity is filled with a third arc-extinguishing medium. When the impact member is triggered, the first sealing layer is pushed and broken by the high-pressure gas, and then the high-pressure gas pushes the third arc-extinguishing medium to break the second sealing layer, so that the third arc-extinguishing medium is ejected from the arc-extinguishing spray cavity, so that the third arc-extinguishing medium extinguishes the arc in the active cavity; A first sub-arc blowing layer and a second sub-arc blowing layer having magnetic properties are respectively arranged on both sides of the first arc extinguishing chamber parallel to the conductive component passing through the first arc extinguishing chamber, and a third sub-arc blowing layer and a fourth sub-arc blowing layer having magnetic properties are respectively arranged on both sides of the second arc extinguishing chamber parallel to the conductive component passing through the second arc extinguishing chamber; wherein the polarities of the first sub-arc blowing layer and the third sub-arc blowing layer are opposite, and the polarities of the second sub-arc blowing layer and the fourth sub-arc blowing layer are opposite, so as to form a magnetic field in the first arc extinguishing chamber and the second arc extinguishing chamber; when an arc is generated in the first arc extinguishing chamber and the second arc extinguishing chamber, the magnetic field produces a magnetic arc blowing effect on the arc, so as to accelerate the arc extinguishing speed in the first arc extinguishing chamber and the second arc extinguishing chamber; A first shielding layer and a second shielding layer are respectively arranged on the side of the first sub-arc blowing layer and the second sub-arc blowing layer opposite to the first arc extinguishing chamber, and a third shielding layer and a fourth shielding layer are respectively arranged on the side of the third sub-arc blowing layer and the fourth sub-arc blowing layer opposite to the second arc extinguishing chamber, so as to prevent the magnetic field generated by the first sub-arc blowing layer, the second sub-arc blowing layer, the third sub-arc blowing layer and the fourth sub-arc blowing layer from affecting the surrounding environment.

2. The fast arc extinguishing excitation fuse according to claim 1, characterized in that: The active chamber comprises an upper active chamber and a lower active chamber, wherein the upper active chamber is arranged in the upper shell and penetrates the upper shell, and the lower active chamber is arranged in the lower shell; The lower active chamber includes a first sub-chamber and a second sub-chamber, the size of the upper active chamber is smaller than the first sub-chamber, and the size of the first sub-chamber is smaller than the second sub-chamber; the first sub-chamber is connected to the upper active chamber and forms a first step with the upper active chamber through the upper shell; the second sub-chamber is connected to the first sub-chamber and forms a second step with the first sub-chamber through the lower shell; Wherein, the conductive component abuts against under the second step.

3. The fast arc extinguishing excitation fuse according to claim 2, characterized in that: The impact member includes a rod-shaped portion and a hammer head; The rod-shaped portion is accommodated in the upper movable cavity, and the shape and size of the rod-shaped portion are adapted to the upper movable cavity; The hammer head is accommodated in the first sub-chamber, and the shape and size of the hammer head are adapted to the first sub-chamber; When the impact member is accommodated in the upper movable chamber and the first sub-chamber and is not triggered, the hammer head abuts against the conductive component.

4. The fast arc extinguishing excitation fuse according to claim 1, characterized in that: A first sealing gasket and a second sealing gasket are respectively arranged on the first cavity wall and the second cavity wall in the arc extinguishing chamber; the first cavity wall, the second cavity wall, the first sealing gasket and the second sealing gasket are all provided with a first through hole adapted to the conductive component; The conductive component passes through the first cavity wall, the first sealing gasket, the second sealing gasket and the first through hole on the second cavity wall in sequence to pass through the arc extinguishing chamber.

5. An electronic circuit, characterized in that: It comprises a fast arc extinguishing excitation fuse as described in any one of claims 1 to 4.

6. An electronic device, characterized in that: It comprises the fast arc extinguishing excitation fuse as described in any one of claims 1 to 4, or the electronic circuit as described in claim 5.

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