Miniature fuse based on multilayer composite arc extinguishing and double sensitive triggering

Abstract

The invention discloses a small fuse based on multilayer composite arc extinguishing and double sensitive triggering, which relates to the technical field of fuses and comprises a base, an internal combination unit, an external installation unit and an arc extinguishing processing unit. According to the invention, a buckle type rapid installation terminal structure is provided, two modes of vertical plugging and horizontal mounting are compatible, a multi-level arc extinguishing measure is provided, and the arc extinguishing capability is effectively improved; through the simulated snakelike hollow design of the fuse wire ring, the fuse path can be prolonged under the same volume, and the breaking capacity is improved; the PTC thermistor is integrally installed at the end, and when the temperature is abnormal, fusing can be triggered in advance, so that the temperature and current double triggering conditions are supported, and double circuit break protection of the circuit is achieved; a fusing mark which is convenient for a maintainer to identify is arranged, and after the marking sliding rod pops up from the upper end of the cover body, the fusing of the internal fuse wire ring is indicated; and the internal fuse ring is also convenient to disassemble and replace.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, and in particular to a small fuse based on multi-layer composite arc extinguishing and dual-sensitive triggering. Background Art

[0002] Miniature fuses belong to the field of circuit protection device technology and are widely used in low-voltage scenarios such as electronic equipment, household appliances, and automotive circuits. They are used to quickly cut off the circuit in the event of overload or short circuit to protect back-end equipment. They are an important electrical component. Traditional small fuses often use a single fuse structure, which presents problems such as limited breaking capacity, difficulty in further reducing their size, and short lifespan due to excessive temperature rise. Existing solutions have improved performance by increasing the number of metal layers or optimizing packaging materials. However, these solutions still face drawbacks such as the conflict between breaking speed and size, irreversible failure after melting, and a single installation method, making them difficult to meet the protection needs of high-density integrated electronic devices. Therefore, we propose a small fuse based on multi-layer composite arc extinguishing and dual-sensitive triggering. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a small fuse based on multi-layer composite arc extinguishing and dual sensitive triggering. The simulated serpentine hollow design of the fuse ring can extend the melt path under the same volume and improve the breaking capacity; and by integrating the PTC thermistor at the end, it can trigger the fuse in advance when the temperature is abnormal, thereby supporting the dual triggering conditions of temperature and current and realizing dual circuit-breaking protection for the circuit; and it has multi-level arc extinguishing measures to effectively improve the arc extinguishing capacity. After the cover is installed and fixed, the two mounting clamps are clamped on the outside of the middle straight section of the fuse ring, and the inner grooves are used to clamp together to form a small In a closed space, the hot gas generated by the melting of the melt induces the solid gas-producing material to produce non-conductive gas to extinguish the arc. The arc-extinguishing coating and the filling of quartz sand can also achieve an effective arc-extinguishing effect. In addition, it also has a fuse mark that is easy for maintenance personnel to identify. When the solid gas-producing material in the internal space of the installation clamp produces gas, the air pressure will produce an upward thrust on the thin sheet, thereby driving the marking slide bar to move upward. After the marking slide bar pops out from the upper end of the cover body, it means that the internal fuse ring has melted. After the melting occurs, the fuse ring can be easily replaced by loosening the fixing bolts at the mounting bracket, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a small fuse based on multi-layer composite arc extinguishing and dual sensitive triggering, comprising a base, an internal combination unit, an external mounting unit and an arc extinguishing processing unit; Base: A rectangular plate with a cover that is also a rectangular block with the same width and height as the base. Internal combination unit: comprises a ceramic holder, a fuse ring, a fuse end and a PTC thermistor, the upper end of the base is fixedly connected with two groups of left and right ceramic holders, each group of ceramic holders comprises two arc-shaped card slots, the openings of the left and right groups of ceramic holders are opposite, and the openings of the two ceramic holders on adjacent sides are the same and face upwards, the fuse ring is a snake-shaped structure, and the curved ends of the left and right parts are centrally symmetrical, the left and right parts of the fuse ring are integrally fixedly connected through the middle longitudinal straight section, and the middle straight section of the fuse ring is provided with upper and lower rows of teeth, the spacing of each row of teeth is equal, and a nano zinc oxide arc-extinguishing coating is coated in each tooth, the fuse ring is a double-layer arc structure, and the overall structure is approximately circular, the ends of the double-layer arc structure are connected by a folded section at the corner, the ends of the outermost circle of the fuse ring are fixedly connected with a straight fuse end, and a PTC thermistor is embedded and installed at the front and rear fuse ends; External mounting unit: installed at the front and rear ends of the base; Arc extinguishing unit: installed on the lower side of the cover.

[0005] The ceramic holder is used for installing and clamping the fuse ring. The simulated serpentine hollow design of the fuse ring can extend the melt path and improve the breaking capacity under the same volume. By opening equidistant teeth in the middle straight section of the fuse ring, the specific location of the fuse can be formed. The front and rear fuse ends are used to make electrical connections with the outer metal tabs. By integrating the PTC thermistor at the end, the fuse can be triggered in advance when the temperature is abnormal, thereby supporting the dual trigger conditions of temperature and current, and realizing double circuit breaking protection for the circuit.

[0006] Furthermore, the internal assembly unit also includes a panel, a socket, a post, and a screw. The upper edge of the base is fixedly connected to a rectangular panel. Circular sockets are provided at the four corners of the upper end of the base. The sockets extend upward through a portion of the corner of the panel, thereby forming a quarter-circle fan-shaped concave structure at the corner of the panel. The four corners of the lower end are all provided with vertical posts, each of which is inserted into the interior of the socket, and the circumferential side of the post fits tightly with the fan-shaped groove at the corner of the panel. Screws are embedded and installed at the four corners of the upper end of the cover. The screws pass through the post and are threaded into the bottom of the socket. After the cover is inserted into the cover, the panel can form a fitting seal with the edge of the cover. When the post is inserted into the socket, the base and the cover can be fastened by tightening the screws. When the cover is installed, the circumferential side of the post fits tightly with the fan-shaped groove at the corner of the panel, which makes it easier for the post to align with the socket.

[0007] Furthermore, the internal assembly unit further includes a sealing gasket, which is fixedly mounted on the inner side of the lower end of the cover, and is vertically aligned with the upper end of the enclosure. After the cover is installed, the sealing gasket can be compressed between the cover and the enclosure, thereby achieving a good sealing effect, preventing leakage of the internal quartz sand, and preventing the ingress of external moisture.

[0008] Furthermore, the external mounting unit includes a metal tab and a slot assembly. A square metal tab is mounted on each of the front and rear sides of the enclosure, and a slot assembly is defined along each side edge of the tab. The metal tab is used to electrically connect to the external device, and the slot assembly is used to securely engage the metal tab with the external device.

[0009] Furthermore, the external mounting unit further includes a mounting bracket and a metal clamp. Two front and rear U-shaped mounting brackets are mounted in the middle of the inner side of the enclosure. The inner ends of the metal tabs are fixedly connected to two left and right metal clamps. The fuse link is inserted into the middle side of the U-shaped mounting bracket. The two metal clamps pass through the enclosure and are inserted into the mounting bracket, where they are clamped on the left and right sides of the fuse link. The mounting bracket is used to mount and support the metal clamps and fuse link, which are assembled and inserted into the mounting bracket.

[0010] Furthermore, the external mounting unit further includes threaded holes and fixing bolts. Threaded holes are provided on both the left and right sides of the mounting bracket and on the outer side of the metal clamp. The threaded holes extend through the sides of the mounting bracket, and the fixing bolts pass through the mounting bracket and are tightened against the interior of the metal clamp. The fixing bolts secure the metal clamp to the fuse link, and loosening the fixing bolts facilitates replacement of a blown fuse link.

[0011] Furthermore, the arc extinguishing unit includes mounting clamps and solid gas-generating material. The lower end of the cover is fixedly connected to a number of ceramic holders equal to the number on the lower base, with the holders arranged vertically in pairs. Two left and right mounting clamps are fixedly connected to the middle side of the lower end of the cover. Opposing sides of the two mounting clamps each have a groove within which solid gas-generating material is placed. After the cover is installed and secured, the two mounting clamps clamp onto the outer sides of the middle straight section of the fuse ring and, together with the inner grooves, form a small enclosed space. The mounting clamps are used to hold the solid gas-generating material and, together with the inner grooves, form a small enclosed space. When melting occurs, heat is generated within the enclosed space, inducing the solid gas-generating material to produce non-conductive gas to extinguish the arc. Furthermore, the ceramic holders separate the turns of the fuse ring by sufficient distance, enabling the arc energy to be divided by multiple gaps. The nano-zinc oxide arc-extinguishing coating applied to the teeth of the middle section of the fuse ring extinguishes the arc, thereby achieving a multi-layer arc extinguishing solution.

[0012] Furthermore, the arc extinguishing unit further includes a slider and a thin plate. The slider is inserted into the interior of one of the mounting blocks, with its upper end flush with the end surface of the cover. A horizontal thin plate is fixedly connected to the upper middle portion of the slider. When the solid gas-generating material in the mounting block generates gas, the gas pressure exerts an upward force on the thin plate, thereby driving the slider upward. When the slider pops out from the upper end of the cover, it indicates that the internal fuse ring has blown.

[0013] Furthermore, the arc extinguishing unit further comprises quartz sand, and the space enclosed by the base, enclosure, and cover is filled with quartz sand. By filling the quartz sand, the gaps between the sand grains are utilized to divide the arc path and absorb arc heat, thereby facilitating the realization of a multi-level arc extinguishing function.

[0014] Furthermore, the slot assembly includes a central long slot and two left and right short slots, with the long slot and the short slots oriented perpendicularly. By creating slots of varying lengths and orientations, the metal tabs can be inserted vertically and engage with the retaining pins on the chip board, enabling both vertical insertion and horizontal placement, adapting to high-density PCB layouts.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the small fuse based on multi-layer composite arc extinguishing and dual sensitive triggering has the following advantages: 1. The simulated serpentine hollow design of the fuse ring can extend the melt path while maintaining the same volume, thereby improving the breaking capacity. Furthermore, by integrating a PTC thermistor at the end, the fuse can be triggered to blow in advance when the temperature is abnormal, thus supporting dual triggering conditions of temperature and current, and achieving dual circuit-breaking protection for the circuit. 2. It has multi-level arc extinguishing measures. Two mounting clamps are clamped on the outside of the middle straight section of the fuse ring and clamped together by the inner groove to form a small enclosed space. When melting occurs, hot gas is generated in the enclosed space, inducing the solid gas-generating material to produce non-conductive gas to extinguish the arc. In addition, the ceramic holder separates the turns of the fuse ring by a sufficient distance, which can divide the arc energy by multiple gaps. The nano-zinc oxide arc-extinguishing coating applied to the teeth of the middle section of the fuse ring can extinguish the arc. By filling the quartz sand, the gaps between the sand grains are used to divide the arc path and absorb the arc heat, which helps to achieve the multi-level arc extinguishing function. 3. It has a snap-on quick-install terminal structure, compatible with both vertical plug-in and horizontal mounting modes, and has a fuse mark for easy identification by maintenance personnel. When the solid gas-generating material in the internal space of the installation clamp generates gas, the gas pressure will produce an upward thrust on the sheet, thereby driving the marking slide bar to move upward. When the marking slide bar pops out from the upper end of the cover, it means that the internal fuse ring has melted; and the internal fuse ring is easy to disassemble and replace; 4. The present invention uses a simulated serpentine hollow design of the fuse ring to extend the melt path under the same volume and improve the breaking capacity; and by integrating the PTC thermistor at the end, it can trigger the fuse in advance when the temperature is abnormal, thereby supporting the dual triggering conditions of temperature and current and realizing dual circuit breaking protection for the circuit; and it has multi-level arc extinguishing measures to effectively improve the arc extinguishing capacity. After the cover is installed and fixed, the two mounting clamps are clamped on the outside of the middle straight section of the fuse ring, and the inner grooves are used to clamp together to form a small closed space. The hot gas generated by the melting of the melt induces the production of solid products. The gas material generates non-conductive gas to extinguish the arc. The arc-extinguishing coating and the filling of quartz sand can also achieve an effective arc-extinguishing effect. In addition, it has a snap-on quick-install terminal structure, which is compatible with both vertical plug-in and horizontal mounting modes, and has a fuse mark that is easy for maintenance personnel to identify. When the solid gas-generating material in the internal space of the installation clamp generates gas, the air pressure will produce an upward thrust on the thin sheet, thereby driving the marking slide bar to move upward. After the marking slide bar pops out from the upper end of the cover body, it means that the internal fuse ring has blown. The internal fuse ring is easy to disassemble and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the external structure of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the lower side structure of the cover body in the present invention; Figure 4 For the present invention Figure 2 A magnified view of the structure at center A; Figure 5 Schematic diagram of the structure of the metal connector in the present invention.

[0017] Description of reference numerals: 1 base, 2 cover, 3 internal assembly unit, 31 ceramic holder, 32 fuse ring, 33 fuse link terminal, 34 enclosure, 35 socket, 36 post, 37 screw, 38 PTC thermistor, 39 sealing gasket, 4 external mounting unit, 41 mounting bracket, 42 metal tab, 43 metal clamp, 44 threaded hole, 45 fixing bolt, 46 slot assembly, 5 arc extinguishing unit, 51 mounting clamp, 52 solid gas generating material, 53 marking slide bar, 54 sheet, 55 quartz sand. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 5 , this embodiment provides a technical solution: a small fuse based on multi-layer composite arc extinguishing and dual sensitive triggering, comprising a base 1, an internal combination unit 3, an external mounting unit 4 and an arc extinguishing processing unit 5; Base 1: A rectangular plate, with a cover 2, also a rectangular parallelepiped and of the same width and height, installed on top of the base 1; Internal assembly unit 3: includes ceramic holder 31, fuse ring 32, fuse end 33 and PTC thermistor 38. The upper end of base 1 is fixedly connected with two groups of left and right ceramic holders 31. Each group of ceramic holders 31 includes two arc-shaped slots. The openings of the left and right ceramic holders 31 are opposite to each other. The openings of the two ceramic holders 31 on the adjacent side are the same. The fuse ring 32 is a snake-shaped structure, and the curved ends of the left and right parts are centrally symmetrical. The left and right parts of the fuse ring 32 are connected by a longitudinal straight line in the middle. The segments are fixedly connected in an integral manner, and two upper and lower rows of teeth are opened in the middle straight section of the fuse ring 32. The spacing between the teeth in each row is equal, and a nano-zinc oxide arc-extinguishing coating is coated in each tooth. The fuse ring 32 has a double-layer arc structure and is approximately a circular ring structure as a whole. The ends of the double-layer arc structure are connected by folded sections at the corners. The ends of the outermost circles of the fuse ring 32 are fixedly connected to a straight fuse end 33, and a PTC thermistor 38 is embedded and installed at the front and rear fuse ends 33. External mounting unit 4: mounted on the front and rear ends of the base 1; Arc extinguishing unit 5 : installed on the lower side of the cover 2 .

[0020] The ceramic holder 31 is used for installing and clamping the fuse ring 32. The simulated serpentine hollow design of the fuse ring 32 can extend the melt path and improve the breaking capacity while maintaining the same volume. By providing equidistant teeth in the middle straight section of the fuse ring 32, a specific location for the fuse can be formed. The front and rear fuse ends 33 are used to electrically connect to the outer metal tabs 42. By integrating a PTC thermistor at the end, the fuse can be triggered in advance when the temperature is abnormal, thereby supporting dual triggering conditions of temperature and current, and realizing dual circuit-breaking protection for the circuit.

[0021] The internal combination unit 3 also includes a panel 34, a socket 35, a column 36 and a screw 37. The upper edge of the base 1 is fixedly connected to a rectangular circle of panels 34. Circular sockets 35 are provided at the four corners of the upper end of the base 1. The sockets 35 pass through a portion of the corners of the panel 34 upward, thereby forming a quarter-circle fan-shaped concave structure at the corner of the panel 34. Vertical columns 36 are provided at the four corners of the lower end, each of which is inserted into the interior of the socket 35, and the circumferential side of the column 36 fits tightly with the fan-shaped groove at the corner of the panel 34. Screws 37 are embedded and installed at the four corners of the upper end of the cover body 2. The screws 37 pass through the columns 36 and are threadedly connected to the bottom of the socket 35. After the cover body 2 is inserted, the enclosure 34 can form a close seal with the edge of the cover body 2. When the column 36 is inserted into the hole 35, the base 1 and the cover body 2 can be fastened by tightening the screw 37. When the cover body 2 is installed, the circumferential side of the column 36 fits tightly with the fan-shaped groove at the corner of the enclosure 34, which can make it easier for the column 36 to align with the hole 35.

[0022] Internal assembly unit 3 further includes a sealing gasket 39, which is fixedly mounted on the inner side of the lower end of cover 2 and vertically aligned with the upper end of enclosure 34. After cover 2 is installed, sealing gasket 39 is compressed between cover 2 and enclosure 34, achieving a good sealing effect, preventing leakage of internal quartz sand 55 and preventing the ingress of external moisture.

[0023] The external mounting unit 4 includes a metal tab 42 and a slot assembly 46. A square metal tab 42 is mounted on each of the front and rear sides of the enclosure 34. The slot assembly 46 is defined along each side edge of the tab 42. The tab 42 is used to electrically connect to an external device, and the slot assembly 46 is used to securely engage the tab 42 with the external device.

[0024] The external mounting unit 4 also includes a mounting bracket 41 and metal clamps 43. Two U-shaped mounting brackets 41 are mounted in the middle of the inner side of the enclosure 34. The inner ends of the metal tabs 42 are fixedly connected to the left and right metal clamps 43. The fuse end 33 is inserted into the middle side of the U-shaped mounting bracket 41. The two metal clamps 43 pass through the enclosure 34 and are inserted into the mounting bracket 41. The two metal clamps 43 clamp onto the left and right sides of the fuse end 33. The mounting bracket 41 is used to mount and support the metal clamps 43 and the fuse end 33. The metal clamps 43 and the fuse end 33 are inserted and assembled inside the mounting bracket 41.

[0025] The external mounting unit 4 also includes threaded holes 44 and fixing bolts 45. Threaded holes 44 are provided on both the left and right sides of the mounting bracket 41 and on the outside of the metal clamp 43. The threaded holes 44 extend through the sides of the mounting bracket 41. The fixing bolts 45 pass through the mounting bracket 41 and are tightened against the inside of the metal clamp 43. The fixing bolts 45 secure the metal clamp 43 to the fuse tip 33. Loosening the fixing bolts 45 facilitates replacement of the blown fuse ring 32.

[0026] The arc extinguishing processing unit 5 includes a mounting clamp 51 and a solid gas-generating material 52. The lower end of the cover body 2 is fixedly connected to a number of ceramic holders 31 equal to the number at the lower base 1, and the ceramic holders 31 correspond vertically in pairs. The middle side of the lower end of the cover body 2 is fixedly connected to two left and right mounting clamps 51. Grooves are provided on the opposite sides of the two mounting clamps 51, and solid gas-generating materials are placed inside the grooves. After the cover body 2 is installed and fixed, the two mounting clamps 51 are clamped on the outside of the middle straight section of the fuse ring 32, and the inner grooves are used to clamp together to form a small enclosed space. The mounting clamp 51 is used to accommodate the solid gas-generating material 52 and is clamped by the inner groove to form a small enclosed space. When melting occurs, hot gas is generated in the enclosed space, inducing the solid gas-generating material 52 to produce non-conductive gas to extinguish the arc. In addition, the ceramic holder 31 separates the turns of the fuse ring 32 by a sufficient distance, and the arc energy can be divided by multiple gaps. The nano-zinc oxide arc-extinguishing coating applied to the teeth of the middle section of the fuse ring 32 can extinguish the arc, thereby realizing a multi-layer arc-extinguishing measure.

[0027] The arc extinguishing unit 5 also includes a marker slide 53 and a thin plate 54. The marker slide 53 is inserted into the interior of one of the mounting clamps 51. The upper end of the marker slide 53 is flush with the end surface of the cover 2, and a horizontal thin plate 54 is fixedly connected to the upper middle portion of the marker slide 53. When the induced solid gas-generating material 52 in the interior of the mounting clamp 51 generates gas, the gas pressure exerts an upward thrust on the thin plate 54, which in turn drives the marker slide 53 upward. When the marker slide 53 pops out from the upper end of the cover 2, it indicates that the internal fuse ring 32 has blown.

[0028] The arc extinguishing unit 5 further includes quartz sand 55, which is filled within the space enclosed by the base 1, the enclosure 34, and the cover 2. By filling the quartz sand 55, the gaps between the sand grains are utilized to divide the arc path and absorb the arc heat, thereby facilitating the realization of a multi-level arc extinguishing function.

[0029] The slot assembly 46 includes a long central slot and two short slots on either side, with the long slot and the short slots oriented perpendicularly. By creating slots of varying lengths and orientations, the metal tab 42 can be inserted vertically and engage with the retaining pins on the chip board, enabling both vertical insertion and horizontal placement, accommodating high-density PCB layouts.

[0030] The working principle of a small fuse based on multi-layer composite arc extinguishing and dual sensitive triggering provided by the present invention is as follows: In the present invention, the ceramic holder 31 is used for the installation and clamping of the fuse ring 32, and the enclosure 34 can form a fitting seal with the edge of the cover body 2 after the cover body 2 is inserted. When the pin 36 is inserted into the socket 35, the base 1 and the cover body 2 can be fastened by tightening the screw 37; when the cover body 2 is installed, the circumferential side of the pin 36 fits tightly with the fan-shaped groove at the corner of the enclosure 34, which can make it easier for the pin 36 to align with the socket 35. After the cover body 2 is installed, the sealing gasket 39 can be pressed between the cover body 2 and the enclosure 34, thereby achieving a good sealing effect, avoiding leakage of the internal quartz sand 55, and preventing the entry of external moisture. The fuse ring 32 is a double-layer arc-shaped serpentine simulated structure. The left and right parts of the fuse ring 32 are fixedly connected in one piece by a middle longitudinal straight section. The ends of the outermost circles of the fuse ring 32 are fixedly connected to a straight fuse end 33, and a PTC thermistor 38 is embedded and installed at the front and rear fuse ends 33. The simulated serpentine hollow design of the fuse ring 32 can extend the melt path and improve the breaking capacity while maintaining the same volume. By providing equidistant teeth in the middle straight section of the fuse ring 32, a specific melting position can be formed. The front and rear fuse ends 33 are used to electrically connect to the outer metal contacts 42. By integrating the PTC thermistor at the ends, the fuse can be triggered in advance when the temperature is abnormal, thereby supporting the dual triggering conditions of temperature and current and realizing dual circuit-breaking protection for the circuit. When the fuse melts, an arc will be generated, and the arc will cause hazards such as secondary short circuits. The present invention has multi-level arc extinguishing measures. The two mounting clamps 51 are clamped on the outside of the middle straight section of the fuse ring 32, and the inner grooves are used to clamp together to form a small enclosed space. When melting occurs, hot gas is generated in the enclosed space, inducing the solid gas-generating material 52 to produce non-conductive gas to extinguish the arc; in addition, the ceramic holder 31 separates the various turns of the fuse ring 32 by a sufficient distance, and can use multiple gaps to divide the arc energy. The nano-zinc oxide arc-extinguishing coating applied to the teeth of the middle section of the fuse ring 32 can play the role of arc extinguishing. By filling quartz sand 55, the gaps between the sand particles are used to divide the arc path and absorb the arc heat, which helps to achieve the multi-level arc extinguishing function. This invention also has a fuse mark that is easy for maintenance personnel to identify. When the induced solid gas-generating material 52 in the internal space of the installation clamp 51 generates gas, the air pressure will produce an upward thrust on the thin sheet 54, thereby driving the marking slide 53 to move upward. After the marking slide 53 pops out from the upper end of the cover body 2, it indicates that the internal fuse ring 32 has melted; and the internal fuse ring 32 is easy to disassemble and replace. At the installation support block 41, the metal clamp 43 and the fuse end 33 can be fastened together by the fixing bolt 45, and the fuse ring 32 that has melted can be easily replaced by loosening the fixing bolt 45.In addition, it also has a snap-on quick-install terminal structure. The slot group 46 includes a long slot in the middle and two short slots on the left and right. The opening directions of the long slot and the short slot are perpendicular. By opening slots of different lengths and directions, the metal connector 42 can be vertically inserted and snapped into the limit column on the chip board, thereby being compatible with both vertical insertion and horizontal mounting modes, and adapting to high-density PCB layout.

[0031] It is worth noting that the solid gas generating material 52 disclosed in the above embodiments is made of phenolic resin which is more suitable for small fuses.

[0032] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A small fuse based on multi-layer composite arc extinguishing and dual sensitive triggering, characterized by: It comprises a base (1), an internal assembly unit (3), an external mounting unit (4) and an arc extinguishing processing unit (5); The base (1) is a rectangular plate, and a cover (2) which is also a rectangular parallelepiped and has the same width and height is inserted on the top of the base (1); Internal assembly unit (3): comprising a ceramic card seat (31), a fuse ring (32), a fuse end (33) and a PTC thermistor (38), wherein the upper end of the base (1) is fixedly connected with two groups of left and right ceramic card seats (31), each group of ceramic card seats (31) comprises two arc-shaped card slots, the openings of the left and right groups of ceramic card seats (31) are opposite to each other, and the openings of the two ceramic card seats (31) on the adjacent side are the same upward, the fuse ring (32) is a snake-shaped structure, and the curved ends of the left and right parts are centrally symmetrical, and the left and right parts of the fuse ring (32) are The fuse ring (32) is fixedly connected in an integral manner through a longitudinal straight section in the middle, and two upper and lower rows of teeth are opened in the middle straight section of the fuse ring (32), the spacing between the teeth in each row is equal, and a nano zinc oxide arc extinguishing coating is coated in each tooth. The fuse ring (32) is a double-layer arc structure, and the whole is approximately a circular ring structure. The ends of the double-layer arc structure are connected through the folded sections at the corners. The ends of the outermost ring of the fuse ring (32) are fixedly connected to a straight fuse end (33), and a PTC thermistor (38) is embedded and installed at the front and rear fuse ends (33); External mounting unit (4): mounted on the front and rear ends of the base (1); Arc extinguishing processing unit (5): installed on the lower side of the cover (2).

2. A miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 1, characterized in that: The internal assembly unit (3) further comprises a panel (34), a socket (35), a plug post (36) and a screw (37). The upper edge of the base (1) is fixedly connected with a rectangular panel (34). Circular plug posts (35) are provided at the four corners of the upper end of the base (1). The plug posts (35) extend upward through a portion of the corner of the panel (34), thereby forming a quarter-circle fan-shaped concave structure at the corner of the panel (34). The four corners of the lower end are all provided with vertical plug posts (36), each of which is inserted into the interior of the socket (35), and the circumferential side of the plug post (36) is tightly fitted with the fan-shaped groove at the corner of the panel (34). Screws (37) are embedded and installed at the four corners of the upper end of the cover (2). The screws (37) pass through the plug post (36) and are threadedly connected to the bottom of the socket (35).

3. The miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 1 is characterized in that: The internal assembly unit (3) further comprises a sealing gasket (39). A sealing gasket (39) is fixedly mounted on the inner side of the lower end of the cover body (2). The sealing gasket (39) vertically corresponds to the upper end of the enclosure (34).

4. The miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 1 is characterized in that: The external mounting unit (4) comprises a metal connecting piece (42) and a slot group (46). A square metal connecting piece (42) is inserted into the front and rear sides of the enclosure (34), and a slot group (46) is provided on each side edge of the metal connecting piece (42).

5. The miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 1 is characterized in that: The external mounting unit (4) further comprises a mounting bracket (41) and a metal clamp (43), two front and rear U-shaped mounting brackets (41) are mounted on the inner middle portion of the enclosure (34), the inner end of the metal contact piece (42) is fixedly connected to two left and right metal clamps (43), the fuse end (33) is inserted into the middle side of the U-shaped mounting bracket (41), the two metal clamps (43) pass through the enclosure (34) and are inserted into the interior of the mounting bracket (41), and the two metal clamps (43) are clamped on the left and right sides of the fuse end (33).

6. A miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 5, characterized in that: The external mounting unit (4) further comprises a threaded hole (44) and a fixing bolt (45). The left and right sides of the mounting bracket (41) and the outward side of the metal clamp (43) are provided with threaded holes (44). The threaded hole (44) passes through the side of the mounting bracket (41). The fixing bolt (45) passes through the mounting bracket (41) and is tightened against the inside of the metal clamp (43).

7. The miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 1, characterized in that: The arc extinguishing processing unit (5) includes a mounting clamp (51) and a solid gas-generating material (52). The lower end of the cover body (2) is fixedly connected with a number of ceramic holders (31) equal to the number at the lower base (1), and the ceramic holders (31) correspond vertically in pairs. The middle side of the lower end of the cover body (2) is fixedly connected with two left and right mounting clamps (51). The opposite sides of the two mounting clamps (51) are provided with grooves, and the solid gas-generating material is placed inside the grooves. After the cover body (2) is installed and fixed, the two mounting clamps (51) are clamped on the outer side of the middle straight section of the fuse ring (32), and the inner grooves are used to clamp together to form a small closed space.

8. The miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 7, characterized in that: The arc extinguishing processing unit (5) further comprises a marking slide bar (53) and a thin sheet (54), wherein the marking slide bar (53) is inserted into the interior of one of the mounting clamps (51), the upper end of the marking slide bar (53) is flush with the end surface of the cover body (2), and a horizontal thin sheet (54) is fixedly connected to the upper middle portion of the marking slide bar (53).

9. The miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 1, characterized in that: The arc extinguishing processing unit (5) further comprises quartz sand (55), and the space enclosed by the base (1), the enclosure (34) and the cover (2) is filled with the quartz sand (55).

10. The miniature fuse based on multi-layer composite arc extinguishing and dual sensitive triggering according to claim 4, characterized in that: The slot group (46) comprises a middle long slot and two left and right short slots, and the opening directions of the long slot and the short slot are perpendicular.

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