Novel miniature fuse

Abstract

The invention relates to the field of circuit protection devices, and discloses a novel small fuse which comprises a first shell, one side of the first shell is provided with a second shell, the other side of the first shell is rotatably connected with a rotating column, the outer wall of the rotating column is fixedly connected with a mounting frame, the top of the mounting frame is provided with a limiting groove, and the limiting groove is fixedly connected with the rotating column. A fixing frame is mounted on one side of the mounting frame, an indicating lamp is mounted on one side of the fixing frame, conducting strips are symmetrically connected to one side of the indicating lamp, a melt is mounted on the other side of the mounting frame, and the outer wall of the melt is coated with a nano-zinc oxide arc extinguishing coating. The outer wall of the melt is coated with the nano-zinc oxide arc extinguishing coating, and the cooperative design of the rotatable mounting frame and the limiting structure is matched, so that when the melt is fused to generate an electric arc, the nano-zinc oxide coating is decomposed into nano-scale particles at high temperature, free electrons in the electric arc are quickly adsorbed, and the conductivity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit protection devices, in particular to a novel small fuse. Background Art

[0002] In modern electronic and power systems, circuit protection devices are key components for ensuring safe operation. Fuses, a fundamental element that provides circuit overload and short-circuit protection by melting the fuse element, are widely used in household appliances, industrial control, new energy equipment, and other fields. The miniaturization and integration of electronic devices are driving higher demands on fuse size, interrupting capacity, ease of maintenance, and reliability. This is especially true in high-frequency applications such as kitchen appliances, where fuses must simultaneously meet requirements for high arc extinguishing efficiency, identifiable status, and easy replacement.

[0003] Traditional small fuses mostly use a fixed insulating shell and a rigid melt installation structure. The melt is usually lead-antimony alloy wire or copper sheet. The arc extinguishing method relies on quartz sand filling or natural air cooling. It is difficult to quickly suppress the arc energy during large current interruption, which can easily cause shell carbonization or equipment damage. Summary of the Invention

[0004] In response to the deficiencies of the prior art, the present invention provides a new type of small fuse to solve the problem that traditional small fuses are difficult to quickly suppress arc energy during large current interruption, which can easily cause shell carbonization or equipment damage.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a new type of small fuse, comprising a first shell, a second shell is installed on one side of the first shell, and a rotating column is rotatably connected to the other side of the first shell, the outer wall of the rotating column is fixedly connected to a mounting frame, and a limiting groove is provided on the top of the mounting frame, a fixing frame is installed on one side of the mounting frame, an indicator light is installed on one side of the fixing frame, a conductive sheet is symmetrically connected to one side of the indicator light, a melt is installed on the other side of the mounting frame, the outer wall of the melt is coated with a nano zinc oxide arc extinguishing coating, one side of the melt is connected to one side of the conductive sheet, and a conductive clip is symmetrically connected to the other side of the melt, a terminal is installed on one side of the conductive clip, and both sides of the conductive clip are symmetrically fixedly connected to the limiting strip, a U-shaped clamping block is installed on one side of the limiting strip, and one side of the first shell and one side of the second shell are fixedly connected to the limiting structure.

[0006] By adopting the above technical solution, the nano zinc oxide arc-extinguishing coating on the outer wall of the fuse is decomposed into nano-scale zinc oxide particles by high temperature when an arc is generated by overcurrent melting. These particles quickly diffuse into the arc area and adsorb free electrons, significantly reducing the arc conductivity. At the same time, they absorb the arc energy and accelerate its cooling and extinguishing. The mounting frame forms an openable and closable structure through the rotating column and the shell to ensure that the melt is in the best arc extinguishing position when disconnecting. The limiting structure prevents the mounting frame from loosening and causing the arc path to deviate through the locking cooperation of the limiting block and the limiting groove, thereby achieving improved arc extinguishing efficiency and enhanced breaking capacity, and solving the problem that traditional small fuses are difficult to quickly suppress the arc energy during large current disconnection, which easily causes shell carbonization or equipment damage.

[0007] Preferably, one end of the rotating column is rotatably connected to one side of the second shell, and arc-extinguishing grids are installed on the inner wall of the second shell. The arc-extinguishing grids are made of ceramic material, and the number of the arc-extinguishing grids is 3-5.

[0008] Preferably, a heat dissipation hole is opened in the middle of the first shell, first elastic clips are symmetrically installed on the outer wall of the first shell, and the second shell is installed on one side of the first shell through the first elastic clip.

[0009] Preferably, the thickness of the nano zinc oxide arc-extinguishing coating is 5-10 μm, and a second through groove is provided on the bottom of the first shell and the bottom of the second shell, and the second through groove is located on the side away from the terminal.

[0010] Preferably, the U-shaped clamping block is made of elastic metal material, and a first through slot is provided on the top of the first shell and the top of the second shell, and the first through slot is located on the top of the terminal.

[0011] Preferably, it further comprises a second elastic buckle, wherein the outer wall of the second elastic buckle is clamped on one side of the bottom of the first shell and one side of the bottom of the second shell.

[0012] Preferably, one side of the conductive clip and one side of the terminal are both installed inside the first housing, and the other side of the conductive clip and the other side of the terminal are both installed inside the second housing.

[0013] Preferably, the limiting structure includes a fixed cylinder, the outer walls of the two fixed cylinders are fixedly connected to one side of the first shell and one side of the second shell, sliding grooves are evenly opened inside the fixed cylinder, the inner wall of the fixed cylinder is slidably connected to a connecting plate, and one side of the connecting plate is fixedly connected to a limiting block.

[0014] Preferably, the side of the connecting plate away from the limit block is fixedly connected to a spring, one side of the spring is installed on the inner wall side of the fixed cylinder, the circumferential outer wall of the connecting plate is evenly fixedly connected to a slider, and the outer wall of the slider is slidably connected to the slide groove of the fixed cylinder.

[0015] Preferably, an indicator light cover is installed on one side of the top of the mounting frame, and the indicator light cover is located on the top of the indicator light, and the indicator light is an LED indicator light.

[0016] Working principle: When in use, push the mounting bracket upwards, the edge of the limit slot will produce an oblique thrust on the limit block, forcing the spring to compress, and the limit block will exit the limit slot and enter the fixed cylinder. The mounting bracket can be rotated around the rotating column to open, and the fuse is installed on the mounting bracket. Then press the mounting bracket downward to make the limit block re-engage with the limit slot, and the melt is connected to the conductive sheet. When the melt blows, the circuit is disconnected, and the current flows through the conductive sheet through the indicator light to light it up, realizing a visual indication of the blowing state, which is convenient for quickly judging the working state of the fuse. At the same time, the melt is connected to the terminal through a symmetrically arranged conductive clip to form a current path, and the conductive clip is pressed by the elastic clamping force of the U-shaped clamping block to eliminate the gap at the connection between the conductive clip and the melt, thereby ensuring the stability of the electrical connection, reducing contact resistance, and reducing heat generation during operation. The terminal is installed on the housing for connection to the external circuit to realize the installation and conduction of the fuse in the circuit.

[0017] The present invention provides a new type of small fuse. It has the following beneficial effects: 1. The present invention coats a nano-zinc oxide arc-extinguishing coating on the outer wall of the fuse, and cooperates with the coordinated design of a rotatable mounting frame and a limiting structure. When the fuse melts and an arc is generated, the nano-zinc oxide coating decomposes into nano-scale particles at high temperature, quickly adsorbs free electrons in the arc and reduces the conductivity. At the same time, the mounting frame stably positions the fuse disconnection position through a rotating column, and the limiting structure prevents the mounting frame from loosening and causing the arc path to deviate by locking the limiting block and the limiting groove, thereby achieving improved arc extinguishing efficiency and enhanced breaking capacity, and solving the problem that traditional small fuses are difficult to quickly suppress the arc energy during large current disconnection, which easily causes shell carbonization or equipment damage.

[0018] 2. The present invention uses the rotational connection between the rotating column and the first shell to enable the mounting bracket to open and close around the axis of the rotating column. The limiting block in the limiting structure is locked with the limiting groove of the mounting bracket. The mounting bracket can be moved upward to disengage from the limiting structure, driving the melt to be rotated out of the shell for replacement. The operation can be completed without tools, thereby realizing convenient replacement of the melt and solving the problems of cumbersome replacement and low maintenance efficiency of traditional fuses.

[0019] 3. The present invention installs the indicator light on one side of the mounting frame through a fixing frame. The indicator light is connected in parallel with the fuse through a conductive sheet. During normal operation, the indicator light does not light up due to insufficient conduction voltage of the fuse. After the fuse blows, the circuit is disconnected, and the indicator light obtains voltage through the conductive sheet and lights up, realizing a visual indication of the blown state, facilitating quick judgment of the working state of the fuse, improving the problem that traditional fuses cannot intuitively identify the blown state, and shortening the troubleshooting time.

[0020] 4. The present invention utilizes the limiting bars on both sides of the conductive clamp to install a U-shaped elastic clamping block, and uses the elastic clamping force to press the conductive clamp, thereby eliminating the gap at the connection between the conductive clamp and the fuse, ensuring the stability of the electrical connection, reducing contact resistance, and reducing heat generation during operation. It improves the problems of increased contact resistance and local overheating caused by the connection gap in traditional fuses, and improves the long-term reliability of the connection.

[0021] 5. The present invention uses a limiting structure fixed on one side of the first shell and the second shell, and utilizes the spring, connecting plate and slider in the fixed cylinder to make the limiting block snap into the limiting groove of the mounting bracket under the thrust of the spring, forming a stable lock. In a vibration environment, the spring continuously applies pressure to prevent the mounting bracket from loosening, ensuring the stability of the internal fuse assembly, solving the problem of the traditional fuse mounting bracket being easy to loosen and causing the arc path to deviate, thereby improving the reliability of the product.

[0022] 6. The present invention symmetrically arranges the first elastic clip on the outer wall of the first shell to form an elastic engagement with the slot on the side of the second shell, thereby realizing quick plug-in and pull-out installation of the shell. At the same time, the outer wall protrusion of the second elastic clip at the bottom forms a secondary lock with the slot at the bottom of the shell, so that when the first elastic clip is inserted into the PCB socket in the vertical direction, the second elastic clip is synchronously engaged with the bottom limit slot to form a vertical plug-in mode; when the side of the shell is horizontally mounted on the PCB, the oblique hook structure of the first elastic clip cooperates with the horizontal slot, and the second elastic clip realizes side mounting locking through lateral elastic deformation. The multi-angle adaptability of the elastic clip reduces the volume occupied by the installation space, saving more assembly time compared to the traditional screw fixing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the second shell of the present invention; Figure 3 This is a schematic diagram of the structure of the mounting bracket of the present invention after rotation; Figure 4 It is a schematic diagram of the partial structure of the conductive clip of the present invention; Figure 5 It is a schematic diagram of the partial structure of the U-shaped clamping block of the present invention; Figure 6 This is a schematic diagram of the internal structure of the mounting frame of the present invention; Figure 7 This is an exploded schematic diagram of the mounting bracket of the present invention; Figure 8 It is an explosion diagram of the present invention; Figure 9 It is a schematic diagram of the local structure of the fixed cylinder of the present invention; Figure 10It is a schematic diagram of the internal structure of the fixed cylinder of the present invention.

[0024] Among them, 1. First shell; 2. Second shell; 3. First elastic clip; 4. Mounting frame; 5. Limit block; 6. Indicator light cover; 7. First through slot; 8. Second elastic clip; 9. Second through slot; 10. Rotating column; 11. Limit slot; 12. Fixing frame; 13. Conductive clip; 14. Terminal; 15. Melt; 16. U-shaped clamping block; 17. Limit strip; 18. Indicator light; 19. Conductive sheet; 20. Fixing cylinder; 21. Connecting plate; 22. Slider; 23. Spring; 24. Slide; 25. Heat dissipation hole; 26. Arc extinguishing grid. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all 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.

[0026] Please see the attached Figure 1 -Attached Figure 10 An embodiment of the present invention provides a new type of small fuse, including a first shell 1, a second shell 2 is installed on one side of the first shell 1, and a rotating column 10 is rotatably connected to the other side of the first shell 1. The outer wall of the rotating column 10 is fixedly connected to the mounting frame 4, and a limiting groove 11 is provided on the top of the mounting frame 4. A fixing frame 12 is installed on one side of the mounting frame 4, an indicator light 18 is installed on one side of the fixing frame 12, and a conductive sheet 19 is symmetrically connected to one side of the indicator light 18. A melt 15 is installed on the other side of the mounting frame 4, and the outer wall of the melt 15 is coated with a nano zinc oxide arc-extinguishing coating. One side of the melt 15 is connected to one side of the conductive sheet 19, and a conductive clip 13 is symmetrically connected to the other side of the melt 15. A terminal 14 is installed on one side of the conductive clip 13. Limiting strips 17 are symmetrically fixedly connected to both sides of the conductive clip 13, and a U-shaped clamping block 16 is installed on one side of the limiting strip 17. One side of the first shell 1 and one side of the second shell 2 are both fixedly connected to the limiting structure.

[0027] Specifically, the outer shell structure of this fuse is formed by the first shell 1 and the second shell 2, which provide protection and installation basis for internal components. Through the rotation of the rotating column 10 on the first shell 1, the mounting frame 4 fixed on the outer wall can rotate on the outer shell around the axis of the rotating column 10 to realize the opening and closing action of the mounting frame 4. The melt 15 is installed through the mounting frame 4. The nano zinc oxide arc extinguishing coating is coated on the outer wall of the melt 15. When the melt 15 is melted due to overcurrent, the high temperature generated by the arc causes the nano zinc oxide coating to decompose, and the released particles absorb the free electrons in the arc, reducing the conductivity of the arc, accelerating the arc extinction, and improving the arc extinguishing efficiency and breaking capacity of the fuse. An indicator light 18 is installed on one side of the mounting frame 4 through the fixing frame 12, and the conductive plates 19 are symmetrically connected to the two sides of the indicator light 18. The conductive plates 19 are electrically connected to the melt 15. During normal operation, the current is conducted through the fuse 15, and the indicator light 18 does not light up due to the low voltage at both ends; when the fuse 15 blows, the circuit is disconnected, and the current flows through the conductive sheet 19 through the indicator light 18 to light it up, realizing a visual indication of the blown state, which is convenient for quickly judging the working state of the fuse.

[0028] One side of the fuse 15 is connected to the conductive sheet 19, and the other side is connected to the terminal 14 via a symmetrically arranged conductive clip 13, forming a current path. Limit bars 17 are fixed to both sides of the conductive clip 13, and a U-shaped clamping block 16 is mounted on the limit bars 17. Made of elastic material, the U-shaped clamping block 16 presses against the conductive clip 13 through its elastic clamping force, eliminating the gap at the connection between the conductive clip 13 and the fuse 15, ensuring the stability of the electrical connection, reducing contact resistance, and reducing heat generation during operation. The terminal 14 is mounted on the shell and is used to connect with the external circuit to realize the installation and conduction of the fuse in the circuit. The limiting structure cooperates with the limiting groove 11 on the mounting bracket 4, so that the mounting bracket 4 is limited in the shell structure. When necessary, the mounting bracket 4 is moved upward to make the mounting bracket 4 free from the limitation of the limiting structure, driving the melt 15 to rotate with the rotating column 10 as the center of the circle, so that the melt 15 can be taken out and replaced conveniently, thereby realizing convenient installation and replacement of the melt. At the same time, the arc extinguishing performance is improved by the nano zinc oxide arc extinguishing coating, the intuitive display of the fusing state is realized by the indicator light, and the stability of the connection is guaranteed by the limiting structure and the U-shaped clamping block 16, meeting various requirements. In order to meet the circuit protection needs in various scenarios, a nano-zinc oxide arc-extinguishing coating is coated on the outer wall of the fuse, and a rotatable mounting frame and a limiting structure are designed in coordination. When the fuse melts and an arc is generated, the nano-zinc oxide coating is decomposed into nano-scale particles at high temperature, which quickly absorbs free electrons in the arc and reduces the conductivity. At the same time, the mounting frame stably positions the fuse disconnection position through the rotating column, and the limiting structure prevents the mounting frame from loosening and causing the arc path to deviate by locking the limiting block and the limiting groove, thereby achieving improved arc extinguishing efficiency and enhanced breaking capacity, and solving the problem that traditional small fuses are difficult to quickly suppress the arc energy during large current disconnection, which is easy to cause shell carbonization or equipment damage.

[0029] Please see the attached Figure 1 -Attached Figure 3 , Attachment Figure 8 One end of the rotating column 10 is rotatably connected to one side of the second housing 2. Arc-quenching grids 26 are mounted on the inner wall of the second housing 2. Arc-quenching grids 26 are made of ceramic and are present in 3-5 pieces. A heat dissipation hole 25 is defined in the center of the first housing 1. First elastic clips 3 are symmetrically mounted on the outer wall of the first housing 1. The second housing 2 is mounted on one side of the first housing 1 via these first elastic clips 3.

[0030] Specifically, one end of the rotating column 10 is rotatably connected to the second housing 2 via an axial hole defined in the sidewall of the second housing 2. A wear-resistant plastic bushing can be installed in the axial hole to reduce rotational friction. The other end of the rotating column 10 is rotatably connected to the first housing 1, enabling the mounting bracket 4 to open and close about the axis of the rotating column 10. Ceramic arc-extinguishing grids are fixedly mounted on the inner wall of the second housing 2 at the location corresponding to the breakpoint of the melt 15. The grids are arranged in parallel and perpendicular to the arc's upward path. When the melt breaks and an arc is generated, the arc rises into the gaps between the grids under the influence of the hot air flow, breaking it into multiple short arc segments. The high insulation and high-temperature resistance of the ceramic material (capable of withstanding temperatures exceeding 1200°C) effectively block the arc and accelerate ion recombination, shortening the arc extinguishing time. Heat dissipation holes are distributed throughout the center of the first housing 1, extending through the thickness of the housing wall. Heat generated by the melt 15 during operation is transferred to the two housings via the mounting bracket 4. Ambient air flows inward through the heat dissipation holes, removing heat from the surfaces of the two housings and reducing the operating temperature of the melt 15. The first elastic buckle is stamped on both sides of the outer wall of the first shell 1. The buckle has a hook-shaped structure. A slot is provided at the corresponding position of the second shell 2. When installing, the second shell is pushed in along the buckle direction, and the hook is inserted into the slot to form an elastic lock. When disassembling, press the buckle hook to separate. This connection method ensures that the shell is tightly assembled and is convenient for quick disassembly and assembly. The sealing performance can prevent dust and moisture from invading the internal circuit, thereby utilizing the ceramic arc-extinguishing grid and the melt arc-extinguishing coating to synergistically improve the breaking capacity. The heat dissipation hole 25 cooperates with the convection channel to reduce the temperature rise of the shell. The first elastic buckle 3 connection ensures assembly efficiency and structural stability, and is suitable for various circuit protection scenarios.

[0031] The arc-quenching nano-zinc oxide coating has a thickness of 5-10 μm. A second through-slot 9 is defined at the bottom of both the first and second housings 1 and 2, located on the side away from the terminal 14. The U-shaped clamping block 16 is made of a resilient metal material. A first through-slot 7 is defined at the top of both the first and second housings 1 and 2, located on top of the terminal 14.

[0032] Specifically, the nano zinc oxide arc-extinguishing coating is evenly coated on the surface of the melt 15 through a vapor deposition process to form a continuous and dense microstructure. The coating maintains its insulating properties under normal conditions. When the melt 15 generates an arc due to overcurrent, the high temperature of the arc decomposes the coating to generate nano-scale zinc oxide particles. These particles quickly diffuse into the arc area and form negative ions by absorbing electrons, significantly reducing the arc conductivity while absorbing the arc energy and accelerating its cooling and extinguishing. The second through-slot 9 opened at the bottom of the first shell 1 and the second shell 2 and the first through-slot 7 at the top are respectively located at the bottom and top of the terminal 14, thereby facilitating the connection operation of the terminal 14. At the same time, when the melt generates heat during operation, the hot air rises and is discharged from the top through-slot, and the cold air is replenished from the bottom through-slot, forming natural convection, which effectively takes away the heat at the connection between the terminal 14 and the melt 15, and reduces the contact resistance temperature rise. The U-shaped clamping block 16 is stamped and formed from an elastic metal material such as beryllium bronze. Its open end is inserted into the limit bars 17 on both sides of the conductive clamp 13 through an interference fit, and the arc-shaped structure at the bottom applies continuous elastic pressure to the conductive clamp. This design ensures that the contact interface between the conductive clamp 13 and the melt 15 always maintains a stable contact force, compensates for the gap changes caused by thermal expansion and contraction of the material, and suppresses contact loosening under vibration conditions. During the circuit on-off process, the elastic clamping force ensures a low-resistance connection between the conductive clamp and the melt, reduces Joule heat generation, and improves the long-term reliability of the connection. The synergistic effect of the through groove and the coating significantly reduces the operating temperature rise of the fuse while improving its breaking capacity, thereby extending its service life and meeting the protection needs of frequently started equipment such as kitchen appliances.

[0033] The mounting bracket 4 also includes a second elastic clip 8, the outer wall of which is attached to one side of the bottom of the first housing 1 and one side of the bottom of the second housing 2. One side of the conductive clip 13 and one side of the terminal 14 are both mounted inside the first housing 1, while the other side of the conductive clip 13 and the other side of the terminal 14 are both mounted inside the second housing 2. An indicator light cover 6 is mounted on one side of the top of the mounting bracket 4, and is located on top of an indicator light 18, which is an LED indicator light.

[0034] Specifically, the second elastic clip 8 is injection-molded from an elastic plastic material, with a protrusion on its outer wall corresponding to the slots defined at the bottom of the first and second housings 1 and 2. During installation, the protrusion of the second elastic clip 8 is aligned with the slot and pushed into place. The elastic deformation of the protrusion generates radial pressure, locking it into the slot and securing the first and second housings 1 and 2, preventing the intrusion of dust and moisture. During disassembly, the exposed portion of the clip is pressed to deform the protrusion out of the slot, allowing the housings to separate. This provides convenient operation and a reliable seal. The conductive clip 13 and terminal 14 utilize a through-type mounting structure: one end of the conductive clip 13 extends into the inner cavity of the first housing 1 and is fixedly connected to the portion of the terminal 14 located within the first housing 1 through a crimping process. The terminal 14 is located within the second through-slot 9, allowing current to form a low-resistance path from the terminal 14 to the conductive clip 13, and then to the melt 15, ensuring stable and reliable current conduction. An indicator light cover 6 is mounted on one side of the top of the mounting bracket 4. Made of transparent PC material, the cover has a curved raised structure and covers the top of the LED indicator. Indicator light cover 6 not only protects the LED from dust and mechanical damage but also enhances the light's viewing angle through curved surface refraction, making the indication of the blown state clearer. The LED indicator is connected in parallel with the fuse 15 via a conductive sheet 19. During normal operation, the LED indicator goes out due to insufficient conduction voltage from the fuse 15. Once the fuse 15 blows, the circuit is disconnected, and indicator light 18 illuminates with operating voltage from the conductive sheet 19, providing a visual warning of the blown state. The second elastic clip 8 thus enhances the sealing and structural strength of the housing connection. The combination of indicator light cover 6 and the LED indicator improves the identification efficiency of the blown state, making it suitable for a variety of circuit protection scenarios.

[0035] The limiting structure includes fixed cylinders 20. The outer walls of the two fixed cylinders 20 are fixedly connected to one side of the first shell 1 and one side of the second shell 2. Slide grooves 24 are uniformly formed inside the fixed cylinders 20. A connecting plate 21 is slidably connected to the inner wall of the fixed cylinder 20, and one side of the connecting plate 21 is fixedly connected to the limiting block 5. A spring 23 is fixedly connected to the side of the connecting plate 21 away from the limiting block 5. One side of the spring 23 is mounted on the inner wall of the fixed cylinder 20. Sliders 22 are uniformly fixedly connected to the circumferential outer wall of the connecting plate 21. The outer wall of the slide 22 slides in the slide groove 24 of the fixed cylinder 20.

[0036] Specifically, the fixed cylinder 20 is integrally formed with the first shell 1 and the second shell 2 through an injection molding process. The slide groove 24 provided therein extends axially, and the groove wall is polished to reduce the friction coefficient. The connecting plate 21 is made of engineering plastic, and the slider 22 on its circumferential outer wall forms a clearance fit with the slide groove 24 to ensure smooth sliding without jamming. The limit block 5 is injection-molded with the connecting plate by a metal insert, and the insert is partially embedded in the interior of the connecting plate 21 to form a mechanical lock to ensure the connection strength. The spring 23 is made of stainless steel, and the pre-compression amount is 1 / 3 of its free length, providing a stable elastic restoring force. When the mounting bracket 4 needs to be opened, the mounting bracket 4 is pushed upward so that the arc-shaped inclined surface of the limit block 5 contacts the edge of the limit groove 11. The spring 23 is compressed to cause the connecting plate 21 to slide along the slide groove 24, and the slider 22 guides and limits the connecting plate 21 in the slide groove 24. When the limit block 5 completely enters the fixed cylinder 20, the limit on the mounting frame 4 is released. When the mounting frame is closed, the spring 23 rebounds and pushes the limit block 5 into the limit groove 11, forming a stable lock. The spring applies continuous pressure to the limit block to ensure that it does not loosen in a vibrating environment. When disassembling, push the mounting frame 4 upward, and the edge of the limit groove 11 generates an oblique thrust on the limit block 5, forcing the spring 23 to compress. The limit block 5 exits the limit groove 11 and enters the fixed cylinder 20, and the mounting frame 4 can be rotated around the rotating column 10 to open. The guide cooperation between the slide groove 24 and the slider 22 ensures the accuracy of the linear motion of the limit block 5. The preload design of the spring 23 provides a reliable locking force. The combination of the metal insert and the plastic matrix improves fatigue resistance, so that it can withstand multiple cycles of operation without failure, effectively protecting the internal melt components, and at the same time facilitating the user to quickly replace the blown melt, thereby improving the product's ease of use and reliability.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A novel small fuse, comprising a first housing (1), characterized in that: A second shell (2) is mounted on one side of the first shell (1), a rotating column (10) is rotatably connected to the other side of the first shell (1), a mounting frame (4) is fixedly connected to the outer wall of the rotating column (10), a limiting slot (11) is provided on the top of the mounting frame (4), a fixing frame (12) is mounted on one side of the mounting frame (4), an indicator light (18) is mounted on one side of the fixing frame (12), a conductive sheet (19) is symmetrically connected to one side of the indicator light (18), and a melt (15) is mounted on the other side of the mounting frame (4). ), the outer wall of the melt (15) is coated with a nano zinc oxide arc extinguishing coating, one side of the melt (15) is connected to one side of the conductive sheet (19), the other side of the melt (15) is symmetrically connected to a conductive clip (13), one side of the conductive clip (13) is installed with a terminal (14), both sides of the conductive clip (13) are symmetrically fixedly connected to a limit bar (17), one side of the limit bar (17) is installed with a U-shaped clamping block (16), and one side of the first shell (1) and one side of the second shell (2) are fixedly connected to the limit structure.

2. A novel miniature fuse according to claim 1, characterized in that: One end of the rotating column (10) is rotatably connected to one side of the second shell (2); an arc-extinguishing grid (26) is installed on the inner wall of the second shell (2); the arc-extinguishing grid (26) is made of ceramic material, and the number of the arc-extinguishing grids is 3-5.

3. A novel miniature fuse according to claim 1, characterized in that: A heat dissipation hole (25) is provided in the middle of the first shell (1), a first elastic clip (3) is symmetrically mounted on the outer wall of the first shell (1), and the second shell (2) is mounted on one side of the first shell (1) via the first elastic clip (3).

4. A novel miniature fuse according to claim 1, characterized in that: The thickness of the nano zinc oxide arc-extinguishing coating is 5-10 μm. The bottom of the first shell (1) and the bottom of the second shell (2) are both provided with a second through slot (9), and the second through slot (9) is located on a side away from the terminal (14).

5. A novel miniature fuse according to claim 1, characterized in that: The U-shaped clamping block (16) is made of elastic metal material. The top of the first shell (1) and the top of the second shell (2) are both provided with a first through slot (7), and the first through slot (7) is located at the top of the terminal (14).

6. A novel miniature fuse according to claim 1, characterized in that: It also includes a second elastic buckle (8), the outer wall of the second elastic buckle (8) being clamped on one side of the bottom of the first shell (1) and one side of the bottom of the second shell (2).

7. A novel miniature fuse according to claim 1, characterized in that: One side of the conductive clip (13) and one side of the terminal (14) are both mounted inside the first housing (1), and the other side of the conductive clip (13) and the other side of the terminal (14) are both mounted inside the second housing (2).

8. A novel miniature fuse according to claim 1, characterized in that: The limiting structure comprises a fixed cylinder (20), the outer walls of the two fixed cylinders (20) are fixedly connected to one side of the first shell (1) and one side of the second shell (2), the interior of the fixed cylinder (20) is evenly provided with a sliding groove (24), the inner wall of the fixed cylinder (20) is slidably connected to a connecting plate (21), and one side of the connecting plate (21) is fixedly connected to a limiting block (5).

9. A novel miniature fuse according to claim 8, characterized in that: A spring (23) is fixedly connected to one side of the connecting plate (21) away from the limit block (5), and one side of the spring (23) is mounted on one side of the inner wall of the fixed cylinder (20). A slider (22) is evenly fixedly connected to the circumferential outer wall of the connecting plate (21), and the outer wall of the slider (22) is slidably connected to the sliding groove (24) of the fixed cylinder (20).

10. A novel miniature fuse according to claim 1, characterized in that: An indicator light cover (6) is installed on one side of the top of the mounting frame (4), and the indicator light cover (6) is located on the top of the indicator light (18), and the indicator light (18) is an LED indicator light.

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