A magnetically guided drop-out fuse

Abstract

This utility model relates to a magnetically guided drop-out fuse for use in power distribution systems. Its purpose is to provide a magnetically guided drop-out fuse that is simple in structure, easy to assemble and disassemble, and safe and reliable. This utility model's magnetically guided drop-out fuse includes an insulator, a connecting mechanism, and a fuse tube, which is a striker-type fuse tube. The connecting mechanism includes a magnetically attracted upper connecting mechanism and a lower connecting mechanism. An upper connecting plate is provided at the upper end of the insulator, and the upper connecting plate is fixedly connected to the magnetically attracted upper connecting mechanism. A lower connecting plate is provided at the lower end of the insulator, and the lower connecting plate is rotatably connected to the lower connecting mechanism. The upper end of the striker-type fuse tube is magnetically connected to the magnetically attracted upper connecting mechanism, and the lower end of the striker-type fuse tube is fixedly connected to the lower connecting mechanism.

Description

Technical Field

[0001] This utility model relates to a fuse, and more particularly to a magnetically guided drop-out fuse for use in power distribution systems. Background Technology

[0002] Currently used outdoor drop-out fuses are employed in overhead power distribution systems, providing overcurrent protection, fault current protection, and a visible indication of fuse tripping. Due to their intuitively visible break point and their ability to function as a load switch when used with load disconnectors, they provide a safe working environment for line and equipment maintenance, and are therefore widely used.

[0003] Existing drop-out fuses consist of two main parts: an arc-extinguishing tube and an insulator. During normal operation, the arc-extinguishing tube's moving contact reliably contacts the stationary contact of the insulating support through the tension of the fuse wire, forming a closed circuit. When a system fault occurs, the short-circuit current passes through the fuse wire, causing it to melt and forming an electric arc. The special arc-extinguishing coating material inside the arc-extinguishing tube generates a large amount of arc-extinguishing gas under the action of the arc, rapidly increasing the pressure inside the tube. The gas flows longitudinally along the pipe, quickly elongating and extinguishing the arc. After the fuse wire melts, the moving contact of the arc-extinguishing tube loses tension. Under the weight of the arc-extinguishing tube itself and the action of the stationary contact spring, the arc-extinguishing tube falls, breaking the circuit.

[0004] However, the connection structure between the moving contact at the upper end of the arc-extinguishing tube of a typical drop-out fuse and the stationary contact of the insulator, as well as the connection between the lower end of the arc-extinguishing tube and the insulator, is quite complex. Replacing the arc-extinguishing tube requires the use of special tools (torque wrench, calipers) to disassemble various accessories on the arc-extinguishing tube, and the average replacement time is ≥15 minutes, which is time-consuming and inefficient. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a magnetically guided drop-out fuse that is simple in structure, easy to assemble and disassemble, and safe and reliable.

[0006] This utility model discloses a magnetically guided drop-out fuse, comprising an insulator, a connecting mechanism, and a fuse tube, wherein the fuse tube is a striker-type fuse tube; the connecting mechanism includes a magnetically attracted upper connecting mechanism and a lower connecting mechanism, an upper connecting plate is provided at the upper end of the insulator, the upper connecting plate is fixedly connected to the magnetically attracted upper connecting mechanism, a lower connecting plate is provided at the lower end of the insulator, the lower connecting plate is rotatably connected to the lower connecting mechanism; the upper end of the striker-type fuse tube is magnetically connected to the magnetically attracted upper connecting mechanism, and the lower end of the striker-type fuse tube is fixedly connected to the lower connecting mechanism.

[0007] This utility model relates to a magnetically guided drop-out fuse, wherein an operating ring is fitted onto the striker-type fuse tube.

[0008] This utility model discloses a magnetically guided drop-out fuse, wherein the magnetically connected upper mechanism includes an arc-shaped plate, a support spring, and a magnetic slider with a contact hole. One end of the arc-shaped plate is fixedly mounted on the upper connecting plate with an open side. The support spring is disposed between the upper connecting plate and the arc-shaped plate. The magnetic slider is sleeved on the upper end of the striker-type fuse tube. The arc-shaped groove is provided on the arched side of the arc-shaped plate, and the magnetic slider is provided with a protrusion. The magnetic slider slides within the arc-shaped groove of the arc-shaped plate through the protrusion and is magnetically attracted to the arc-shaped plate.

[0009] This utility model discloses a magnetically guided drop-out fuse, wherein the magnetically connected mechanism further includes a fastening ring, which is disposed within the through hole of the magnetic slider.

[0010] This utility model discloses a magnetically guided drop-out fuse, wherein a limit rod is provided at the arched part of the bow-shaped plate.

[0011] This utility model discloses a magnetically guided drop-out fuse, wherein the lower connecting mechanism includes a contact sleeve and a support rod. One end of the support rod is rotatably connected to the lower connecting plate, and the other end of the support rod is fixedly connected to the contact sleeve. The lower end of the striker-type fuse tube is sleeved in the contact sleeve.

[0012] This utility model discloses a magnetically guided drop-out fuse, wherein the insulator is further provided with a fixing frame.

[0013] This utility model discloses a magnetically guided drop-out fuse, wherein the upper connecting plate is provided with an upper terminal and the lower connecting plate is provided with a lower terminal.

[0014] The difference between this utility model and the prior art is that the fuse of this utility model replaces the screw cap and duckbill static contact structure of the traditional fuse with a magnetic upper connection mechanism and a rotary lower connection mechanism in conjunction with a striker-type fuse tube. This simplifies the fuse structure and operation steps, makes it easier for workers to disassemble and install, shortens construction time, and improves construction efficiency.

[0015] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a magnetically guided drop-out fuse according to the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of a magnetically guided drop-out fuse with the fuse tube concealed.

[0018] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0019] Figure 4for Figure 2 A magnified view of a section at point B in the middle;

[0020] Figure 5 This is a three-dimensional structural diagram of the magnetic slider and fuse tube in this utility model;

[0021] Figure 6 This is a three-dimensional structural diagram of the magnetic slider in this utility model.

[0022] Figure label:

[0023] 01-Insulator; 11-Upper connecting plate; 111-Upper terminal; 12-Lower connecting plate; 121-Lower terminal; 13-Fixing frame; 02-Connecting mechanism; 21-Magnetic upper connecting mechanism; 211-Arch-shaped plate; 2111-Arc-shaped groove; 212-Support spring; 213-Magnetic slider; 2131-Contact hole; 2132-Protrusion; 214-Fasting ring; 215-Limiting rod; 22-Lower connecting mechanism; 221-Contact sleeve; 222-Support rod; 03-Fuse tube; 31-Pin-type fuse tube; 32-Operating ring. Detailed Implementation

[0024] like Figure 1 As shown, this utility model discloses a magnetically guided drop-out fuse, including an insulator 01, a connecting mechanism 02, and a fuse tube 03. The fuse tube 03 is a striker-type fuse tube 31. The connecting mechanism 02 includes a magnetically attracted upper connecting mechanism 21 and a lower connecting mechanism 22. An upper connecting plate 11 is provided at the upper end of the insulator 01, and the upper connecting plate 11 is fixedly connected to the magnetically attracted upper connecting mechanism 21. A lower connecting plate 12 is provided at the lower end of the insulator 01, and the lower connecting plate 12 is rotatably connected to the lower connecting mechanism 22. The upper end of the striker-type fuse tube 31 is magnetically connected to the magnetically attracted upper connecting mechanism 21, and the lower end of the striker-type fuse tube 31 is fixedly connected to the lower connecting mechanism 22.

[0025] Insulator 01 plays a crucial role in the fuse. Firstly, it provides electrical insulation, effectively isolating the live parts of the fuse from the grounded parts, preventing current leakage to the ground or other objects that should not be energized, thus ensuring the safety and reliability of the circuit operation. Secondly, insulator 01 provides mechanical support, firmly supporting components such as the connecting mechanism 02 and the fuse tube 03 through the connecting plates at the upper and lower ends of insulator 01, keeping the entire fuse structure stable and maintaining its normal installation position and operating condition under various environmental conditions and electrical loads.

[0026] The upper connecting plate 11 and the lower connecting plate 12 are welded to the upper and lower ends of the insulator 01 respectively and are arranged in the same direction to provide firm support for the connecting mechanism 02. The magnetic upper connecting mechanism 21 is welded to the lower surface of the upper connecting plate 11. Utilizing its magnetic attraction properties, it cooperates with the fuse tube 03 to magnetically connect the upper contact of the fuse tube 03 to the magnetic upper connecting mechanism 21, forming a conductive circuit that can be opened and closed. The lower connecting mechanism 22 is rotatably connected to the right end of the lower connecting plate 12 by a locking pin. The lower contact of the fuse tube 03 is firmly fixed to the lower connecting mechanism 22 by a fixing pin, forming a drop-out structure in which the fuse tube 03 can rotate around the lower connecting plate 12.

[0027] The fuse tube 03 adopts a striker-type fuse tube 31. When the internal fuse melts, its pop-out striker can push open the fuse tube 03 magnetically attached to the magnetic upper connection mechanism 21, thereby opening the fuse.

[0028] To enhance the safety and stability of the circuit breaker's opening and closing, the upper connecting plate 11 is longer than the lower connecting plate 12. The contact point between the upper contact of the striker fuse tube 31 and the magnetic upper connecting mechanism 21 is further to the right than the contact point between the lower connecting mechanism 22 and the lower connecting plate 12. This design ensures that when the fuse is closed, the striker fuse tube 31 is in an inclined state, which facilitates worker operation and allows the upper contact of the fuse tube 31 to separate from the magnetic upper connecting mechanism 21 using its own weight and the pushing force of the striker. The striker fuse tube 31 then falls downwards, changing from the closed state to the open state.

[0029] The magnetic attraction force of the magnetic upper connection mechanism 21 is greater than the weight of the fuse tube 31 itself, which can prevent the fuse tube 03 from falling off and automatically tripping the circuit breaker. The magnetic attraction force of the magnetic upper connection mechanism 21 is less than the pushing force of the striker of the fuse tube 31, which can avoid the problem that the fuse tube 03 cannot fall off after the striker of the fuse tube 03 pops out when the circuit system is overloaded or short-circuited.

[0030] Fuses are commonly used in three-phase circuits, with three fuses controlling the opening and closing of three circuits respectively. In operation, the lower contact sleeve 221 of the striker-type fuse tube 31 is mounted on the lower connecting mechanism 22 and secured with a fixing pin. The upper contact of the striker-type fuse tube 31 is then pushed, causing it to magnetically attract to the magnetic upper connecting mechanism 21, thus closing the circuit and supplying power normally. When an overload or short circuit occurs in the circuit, the fuse inside the striker-type fuse tube 31 melts, and the striker pin inside the upper contact pops out and presses against the magnetic upper connecting mechanism 21. Under the reaction force, the striker-type fuse tube 31 separates from the magnetic upper connecting mechanism 21 and falls, at which point the fuse opens, and the circuit stops supplying power.

[0031] During replacement, the worker first removes the fallen striker fuse tube 31 from the lower connection mechanism 22, then places the lower contact sleeve 221 of the new striker fuse tube 31 on the lower connection mechanism 22, and finally pushes its upper contact until it is magnetically attracted to the magnetic upper connection mechanism 21, and then closes the circuit again to restore power to the circuit system.

[0032] It should be specifically noted that the internal components of the striker-type fuse tube 31 mainly consist of a fuse wire and a striker mechanism. The fuse wire is the key component, made of a fusible metal material, and remains conductive when normal current flows. When an overload or short circuit occurs in the circuit, and the current exceeds the rated current of the fuse wire, the fusible element heats up to its melting point and melts, thereby cutting off the circuit and providing short-circuit protection. The striker mechanism is connected to the fusible element; when the fusible element melts, the striker will eject.

[0033] like Figure 1 As shown, an operating ring 32 is fitted onto the striker-type fuse tube 31.

[0034] The operating ring 32 is securely fitted onto the striker-type fuse tube 31, which makes it easy for workers to use the operating rod to move the operating ring 32 to open and close the fuse, and also makes it easy to remove or install the fuse tube 03.

[0035] like Figure 2 , 3 As shown in Figures 5 and 6, the magnetic upper connecting mechanism 21 includes an arc-shaped plate 211, a support spring 212, and a magnetic slider 213 with a contact hole 2131. One end of the arc-shaped plate 211 is fixedly mounted on the upper connecting plate 11 on the open side. The support spring 212 is located between the upper connecting plate 11 and the arc-shaped plate 211. The magnetic slider 213 is sleeved on the upper end of the firing pin type fuse tube 31. The arc-shaped groove 2111 is provided on the arched side of the arc-shaped plate 2111. The magnetic slider 213 is provided with a protrusion 2132. The magnetic slider 213 is slidably mounted in the arc-shaped groove 2111 of the arc-shaped plate 211 through the protrusion 2132 and is magnetically attracted to the arc-shaped plate 211.

[0036] The left end of the open side of the bow-shaped plate 211 is welded to the lower surface of the upper connecting plate 11. The upper and lower ends of the support spring 212 are respectively welded to the lower surface of the upper connecting plate 11 and the inner wall of the arched side of the bow-shaped plate 211 (that is, the support spring 212 is located between the upper connecting plate 11 and the bow-shaped plate 211). The bow-shaped plate 211 is made of a magnetic, conductive and tough material. With the help of the elasticity of the support spring 212, the right end of the open side of the bow-shaped plate 211 can maintain a certain distance from the upper connecting plate 11. When the bow-shaped plate 211 is under force, it can be finely adjusted up and down.

[0037] The contacts of the striker fuse tube 31 are securely fitted inside the contact hole 2131 of the magnetic slider 213. The contact hole 2131 can be a through hole or a slot. The operator pushes the operating ring 32 with the operating rod to magnetically attract the striker fuse tube 31 to the bow plate 211 through the magnetic slider 213, thus completing the closing operation. The magnetic slider 213 can be made of a metal material that is both magnetic and conductive, or it can be a combination of magnetic and conductive materials. This design offers several advantages. First, when the slider is magnetically attached to the bow-shaped plate 211, if the bow-shaped plate 211 is subjected to magnetic force or a worker's pushing force, its position can be slightly adjusted downwards or upwards, facilitating the closing operation and effectively buffering the impact force. Second, when the circuit system is overloaded or short-circuited, the fuse inside the striker-type fuse blows, and the striker pops out and presses against the bow-shaped plate 211. Under the action of the striker's pushing force and the weight of the striker-type fuse tube 31 itself, the slider magnetically attached to the bow-shaped plate 211 detaches and falls. At the same time, the bow-shaped plate 211 is pushed upwards by the striker and compresses the support spring 212. After being compressed, the support spring 212 rebounds downwards by its elasticity, causing the bow-shaped plate 211 to be slightly adjusted downwards, applying a reaction force to the striker-type fuse tube 31, further ensuring that the slider can stably detach from the bow-shaped plate 211, thus realizing the automatic opening of the fuse.

[0038] In addition, the lower surface of the bow-shaped plate 211 is provided with two arc-shaped grooves 2111, and the magnetic slider 213 is provided with two matching protrusions 2132. The curvature of the arc-shaped grooves 2111 matches the drop track of the slider and the striker fuse tube 31, ensuring that after the striker of the striker fuse tube 31 is ejected, the slider can fall smoothly along the groove. The slider is limited by the cooperation of the grooves and the protrusions 2132, which enhances the safety and stability of the fuse.

[0039] The magnetic upper connection mechanism 21 also includes a fastening ring 214, which is disposed inside the contact hole 2131 of the magnetic slider 213.

[0040] Both the magnetic slider 213 and the fastening ring 214 are open-type designs, and the fastening ring 214 is provided with two lugs with through holes. The fastening ring 214 is welded to the inner wall of the contact hole 2131 of the magnetic slider 213. The two lugs extend from the opening of the magnetic slider 213. During installation, the contact of the firing pin fuse tube 31 is first inserted into the fastening ring 214, and then the locking pin is inserted into the through holes of the two lugs. This securely fixes the contact of the firing pin fuse tube 31 to the magnetic slider 213, preventing it from falling off and thus enhancing the stability of the fuse.

[0041] This utility model discloses a magnetically guided drop-out fuse, wherein a limit rod 215 is also provided at the arched part of the bow-shaped plate 211.

[0042] A connecting block extends downward from the left end of the bow-shaped plate 211. A U-shaped limiting rod 215 is welded onto the connecting block. When the fuse is in the closed state, the contact on the striker-type fuse tube 31 is located in the center of the U-shaped limiting rod 215. The U-shaped limiting rod 215 limits the fuse tube. When the circuit system is overloaded or short-circuited, the striker-type fuse tube 31 can fall naturally along the predetermined arc without shifting forward or backward, thereby further enhancing the stability of the fuse.

[0043] This utility model discloses a magnetically guided drop-out fuse, wherein the lower connecting mechanism 22 includes a contact sleeve 221 and a support rod 222. One end of the support rod 222 is rotatably connected to the lower connecting plate 12, and the other end of the support rod 222 is fixedly connected to the contact sleeve 221. The lower end of the striker-type fuse tube 31 is sleeved in the contact sleeve 221.

[0044] The left end of the support rod 222 is rotatably connected to the right end of the lower connecting plate 12 via a locking pin. The right end of the support rod 222 is provided with at least two through holes. The contact sleeve 221 is an open design with two lugs. Each lug has a through hole corresponding to the through hole on the support rod 222. The support rod 222 and the contact sleeve 221 are securely connected by a fixing pin (i.e., the fixing pin passes through the two lugs and the through hole on the support rod). This design ensures that the support rod 222 and the contact sleeve 221 are securely connected and can rotate around the lower connecting plate 12. It also securely fixes the lower contact of the striker fuse tube 31 to the contact sleeve 221 to prevent it from falling off.

[0045] During installation, first, the lower contact of the striker fuse tube 31 is fitted into the contact sleeve 221. Then, the fixing pin is passed through the corresponding through holes of the contact sleeve 221 and the support rod 222 for fixation. Next, the magnetic slider 213 is fitted onto the upper contact of the striker fuse tube 31 and secured with a fixing ring. Then, the worker pushes the operating ring 32 upward with the operating rod, and the striker fuse tube 31 rotates counterclockwise with the support rod 222 until the magnetic slider 213 is magnetically attracted to the bow plate 211. At this time, the closing operation is completed, and the circuit system is powered normally.

[0046] When the circuit system is overloaded or short-circuited, the striker of the striker fuse tube 31 pops out, and the magnetic slider 213 and the striker fuse tube 31, under the action of their own gravity and the pushing force of the striker, fall down as the support rod 222 rotates clockwise around the lower connecting plate 12, thus completing the automatic opening of the gate.

[0047] After the striker fuse tube 31 falls, the worker does not need special tools. He only needs to remove the fixing pins on the upper and lower contacts of the striker fuse tube 31 to complete the disassembly. Then, the new striker fuse tube 31 is fixed by the fixing pin. Then, the operating ring 32 is pushed by the operating rod to make the slider magnetically attracted to the bow plate 211, the fuse is reclosed, and the circuit system is restored to power.

[0048] This fuse replaces the screw cap and duckbill-type stationary contact structure of traditional fuses with a magnetic upper connection mechanism 21 and a rotary lower connection mechanism 22, along with a striker-type fuse tube 31. This simplifies the fuse structure and operation steps, makes it easier for workers to disassemble and install, shortens construction time, and improves construction efficiency.

[0049] The insulator 01 is also equipped with a fixing frame 13. The upper connecting plate 11 is equipped with an upper terminal 111, and the lower connecting plate 12 is equipped with a lower terminal 121.

[0050] A fixing frame 13 is welded to the middle of the insulator 01, which securely fixes the fuse to the designated position in the circuit system. An upper terminal 111 is welded to the upper terminal block, and a lower terminal 121 is welded to the lower connecting plate 12. The fuse is connected to the cables in the circuit system to form a circuit through the two terminals.

[0051] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0052] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A magnetically guided drop-out fuse, characterized in that: The device includes an insulator, a connecting mechanism, and a fuse tube, wherein the fuse tube is a striker-type fuse tube; the connecting mechanism includes a magnetic upper connecting mechanism and a lower connecting mechanism, wherein an upper connecting plate is provided at the upper end of the insulator and is fixedly connected to the magnetic upper connecting mechanism, and a lower connecting plate is provided at the lower end of the insulator and is rotatably connected to the lower connecting mechanism; the upper end of the striker-type fuse tube is magnetically connected to the magnetic upper connecting mechanism, and the lower end of the striker-type fuse tube is fixedly connected to the lower connecting mechanism.

2. The magnetically guided drop-out fuse according to claim 1, characterized in that: An operating ring is fitted onto the striker-type fuse tube.

3. The magnetically guided drop-out fuse according to claim 2, characterized in that: The magnetic upper connection mechanism includes an arc-shaped plate, a support spring, and a magnetic slider with a contact hole. One end of the arc-shaped plate is fixedly mounted on the upper connection plate. The support spring is positioned between the upper connection plate and the arc-shaped plate. The magnetic slider is sleeved on the upper end of the firing pin fuse tube. The arc-shaped groove is provided on the arched side of the arc-shaped plate. The magnetic slider has a protrusion. The magnetic slider slides within the arc-shaped groove of the arc-shaped plate through the protrusion and is magnetically attracted to the arc-shaped plate.

4. A magnetically guided drop-out fuse according to claim 3, characterized in that: The magnetic upper connection mechanism also includes a fastening ring, which is disposed inside the through hole of the magnetic slider.

5. A magnetically guided drop-out fuse according to claim 4, characterized in that: A limit rod is also provided at the arched part of the bow-shaped plate.

6. A magnetically guided drop-out fuse according to claim 5, characterized in that: The lower connecting mechanism includes a contact sleeve and a support rod. One end of the support rod is rotatably connected to the lower connecting plate, and the other end of the support rod is fixedly connected to the contact sleeve. The lower end of the striker-type fuse tube is sleeved in the contact sleeve.

7. A magnetically guided drop-out fuse according to claim 6, characterized in that: The insulator is also equipped with a fixing frame.

8. A magnetically guided drop-out fuse according to claim 7, characterized in that: The upper connecting plate is provided with an upper terminal block, and the lower connecting plate is provided with a lower terminal block.

Images