A fuse convenient to disassemble and maintain

Abstract

The application relates to the technical field of fuses, in particular to a fuse convenient to disassemble, assemble and maintain, which comprises a fixed base, two insulators arranged on the fixed base, an upper contact and a lower fixed base fixedly arranged on the two insulators, a fuse body arranged between the upper contact and the lower fixed base, the fuse body comprising a fuse tube, a contact copper piece arranged at the right end of the fuse tube, a tail copper sleeve arranged at the left end of the fuse tube, a conductive through hole arranged on the lower fixed base, and a conductive rod with one end arranged on the tail copper sleeve; a mounting through hole is arranged through the lower fixed base, a clamping step is arranged on the tail copper sleeve, a limiting piece is arranged on the lower fixed base, a control base is arranged on the left side of the lower fixed base, a release rod is fixedly arranged on the control base, and an avoiding opening is arranged on the control base; only a straight-in straight-out mode is needed to control, an operator does not need to accurately control the arc-shaped motion track of the movement of the tail of the fuse tube, the installation and disassembly process of the fuse tube can be realized, and the operation of maintenance is relatively convenient.

Description

Technical Field

[0001] This invention relates to the field of fuse technology, and more specifically to a fuse that is easy to disassemble and maintain. Background Technology

[0002] A fuse is an electrical device that breaks the circuit by melting its fusible element when the current exceeds a specified value. Fuses are current protection devices that utilize the principle that when the current exceeds a specified value for a certain period, the heat generated by the fuse itself melts the fusible element, thus breaking the circuit. Fuses are widely used in high and low voltage power distribution systems, control systems, and electrical equipment as short-circuit and overcurrent protectors, and are one of the most commonly used protective devices.

[0003] Currently, most fuses are drop-out fuses, which are the most commonly used short-circuit protection switches for 10kV distribution line branches and distribution transformers. When installed on 10kV distribution line branches, they can reduce the scope of power outages. Because they have a clear disconnection point, they function as disconnecting switches, creating a safe working environment for the lines and equipment under maintenance.

[0004] Drop-out fuses are a type of fuse widely used in outdoor high-voltage power distribution systems, commonly found on the high-voltage side of distribution transformers. Their typical structure mainly includes an insulating support (such as a porcelain insulator), an upper contact, a lower contact, and a movable fuse tube. One end of the fuse tube contacts or is clamped in the upper contact, while the other end is rotatably connected to the lower contact via a connecting rod and a sliding groove design.

[0005] However, after the fuse wire breaks, the fuse tube needs to be removed from the lower contact to replace the fuse. When installing and removing the fuse tube, the operator needs to precisely control the movement of the tail of the fuse tube so that the connecting rod at the other end rotates and is removed along the sliding track on the lower contact. This operation must be carried out along a fixed arc-shaped movement trajectory, which is quite cumbersome. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings and deficiencies of the prior art by providing a fuse that is easy to disassemble and maintain.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a fuse that is easy to disassemble and maintain, comprising a fixed base, two insulators disposed at the upper end of the fixed base, an upper contact and a lower fixed seat respectively fixed on the two insulators, and a fuse body disposed between the upper contact and the lower fixed seat. The fuse body includes a fuse tube, a contact copper piece disposed at the right end of the fuse tube, a tail copper sleeve disposed on the periphery of the left end of the fuse tube, a conductive through hole opened on the lower fixed seat, and a conductive rod with one end disposed on the tail copper sleeve and the other end located in the conductive through hole.

[0008] The lower fixing seat has a through hole for the tail copper sleeve to move to the right on the lower fixing seat. The tail copper sleeve has a locking step. The lower fixing seat has a limiting member for locking into the locking step after the tail copper sleeve moves to the right, thereby limiting the tail copper sleeve to move to the left in the mounting hole. A control seat is detachably provided on the left side of the lower fixing seat. The control seat has a release rod for driving the limiting member to disengage from the locking step after being pushed to the right into the mounting hole of the lower fixing seat, so that the tail copper sleeve can move to the left in the mounting hole. The inner diameter of the release rod is clearance-fitted with the outer diameter of the tail copper sleeve, and the outer diameter of the release rod is clearance-fitted with the mounting hole. The control seat has a clearance opening for avoiding the conductive rod.

[0009] A further improvement is that the limiting component includes a limiting opening formed on the lower fixed base and connected to the mounting through hole, and a limiting block with one end rotatably disposed on the lower fixed base within the limiting opening and the other end located within the mounting through hole, wherein the limiting block is inclined.

[0010] Further effect: When the tail copper sleeve enters the installation hole, the other end of the limiting block contacts the tail copper sleeve. As the tail copper sleeve moves to the right, the limiting block flips upward around one end until the position of the locking step completely corresponds to the limiting opening. Then, the limiting block flips downward around one end due to its own weight. The inclined limiting block is locked in the locking step. When the molten tube is pushed to the left by external force, the limiting block cannot continue to flip downward, thus restricting the molten tube from driving the tail copper sleeve to move to the left.

[0011] Further benefits: When the fuse is installed at an angle, the inclined limiting block is locked in the locking step, preventing the fuse tube from falling and hitting workers or equipment due to its own weight, thus improving the safety of disassembly and assembly.

[0012] A further improvement is that a push spring is provided between the lower fixed seat and the other end of the limiting block, and the push spring is located in the limiting opening.

[0013] A further improvement is that the side end face of the lower fixed seat is provided with a limiting plate for limiting the tail copper sleeve to move to the right in the mounting hole when the limiting member restricts the tail copper sleeve to move to the left. The limiting plate is provided with a clearance hole for the molten tube and the contact copper part to pass through.

[0014] Further benefits: By setting up the limiting plate and limiting components, the tail copper sleeve can be confined in the mounting hole, thus fixing the movement of the tail copper sleeve.

[0015] A further improvement is that a protective sleeve for protecting the copper contact component is fixedly provided on the upper contact, and the protective sleeve is in clearance fit with the copper contact component.

[0016] Further benefits: The protective sleeve prevents the copper contact parts from being exposed to the outside air for extended periods, thereby reducing the impact of cavitation on the copper contact parts and increasing their service life.

[0017] A further improvement is that: the control base is provided with an auxiliary locking hole, and the tail copper sleeve is provided with a secondary step corresponding to the position of the auxiliary locking hole after the release rod is pushed into the mounting hole to the right; an auxiliary locking block is provided on the control base located in the auxiliary locking hole; one end of the auxiliary locking block is hinged to the control base located in the auxiliary locking hole; and the lower end of the auxiliary locking block is provided with a check block for locking into the secondary step after the auxiliary locking hole and the secondary step are aligned.

[0018] Further effects: When the release lever is inserted into the mounting hole, it pushes the other end of the auxiliary locking block upwards to disengage from the locking step. The position of the secondary step corresponds to that of the check block. At this time, the auxiliary locking block is tilted downwards by its own weight (or by the driving force of the spring after installation) so that the check block enters the secondary step. When the control seat is pulled outwards (to the left), the check block can drive the tail copper sleeve to remove the fuse tube from the mounting hole. This allows the release lever of the control seat to be inserted into the mounting hole, thereby releasing the tail copper sleeve from the lower fixed seat. At the same time, the release lever is pulled out to remove the fuse tube from the mounting hole, eliminating the need to manually hold the fuse tube for removal.

[0019] Further benefits: Because the internal structure of the control base needs to cooperate with the internal structure of the lower fixed base to realize the installation and removal of the fuse tube, the control base can serve as a unique and dedicated installation tool, which can effectively prevent unauthorized personnel from performing illegal operations and improve the working safety of the fuse.

[0020] A further improvement is that the side end face of the control seat is provided with a side opening that is connected to the auxiliary card hole. The auxiliary card block is provided with a limiting plate for rotating the auxiliary card block under pressure to disengage the check block from the sub-step. One end of the limiting plate is fixedly set on the side end face of the auxiliary card block, the other end is located on the outside of the control seat, and the middle part is located in the side opening.

[0021] Further effects: After the control seat is pulled to remove the fusible tube from the mounting hole, the auxiliary locking block can be flipped by pressing the limiting plate with your hand, causing the check block to disengage from the secondary step. At this point, the fusible tube can be pulled outward to separate from the control seat.

[0022] A further improvement is that the copper contact component is provided with an inclined conical surface.

[0023] Further benefits: The inclined conical surface automatically aligns with the clearance hole of the mounting hole or limiting plate when the fusible tube is pulled out from the lower fixed base. Compared to the traditional design where the transition surface between the contact copper part and the fusible tube is set at a right angle, the right angle setting is prone to getting stuck at the clearance hole of the mounting hole or limiting plate when pulling out the fusible tube, resulting in resistance during pull-out. The inclined conical surface design provides a smooth transition at the junction between the contact copper part and the fusible tube, making it less likely to get stuck at the clearance hole of the mounting hole or limiting plate when pulled out, resulting in smoother removal and enabling quick positioning, installation, and disassembly.

[0024] A further improvement is that the control base is provided with a connecting frame for connecting to the head of the insulating operating rod. The lower end of the connecting frame is fixedly connected to the head of the insulating operating rod, and the upper end of the connecting frame is connected to the left and right side faces of the control base.

[0025] Further benefits: By connecting the connector to the head of the insulating operating rod, when the fuse is installed at a high position, it is convenient for the operator to operate the control seat to push the release rod into the installation hole, which improves the convenience of fuse installation and removal. Moreover, the handheld insulating operating rod can protect the operator and reduce the occurrence of electric shock.

[0026] A further improvement is that the lower end of the connecting frame is connected to the head of the insulating operating rod, the upper end of the connecting frame is hinged to the side end face of the control seat, and a positioning element for fixing or unfixing the head of the connecting frame to the side end face of the control seat is provided between the head of the connecting frame and the side end face of the control seat.

[0027] Further improvements: The control unit is divided into two parts, a head and a tail. To release the fuse body from its position on the tail copper sleeve, the release lever at the head of the control unit is used. When the fuse body needs to be installed on the lower fixed base, the head of the connecting bracket can be released from the side face of the control unit using the positioning piece. Then, the control unit is rotated 180 degrees, and the head of the connecting bracket is fixed to the side face of the control unit again using the positioning piece. The tail copper sleeve is then inserted into the tail of the release lever, and the tail copper sleeve is supported by the auxiliary locking block on the locking step. The operator uses the insulated operating lever to move the control unit to align the fuse with the installation hole and insert it, thus facilitating installation during high-altitude operations.

[0028] A further improvement is that the positioning component includes a fixed post disposed at the upper end of the connecting frame, a sliding inner hole opened on the fixed post, a corresponding insertion hole opened on the side end face of the control seat for corresponding to the position of the sliding inner hole after the control seat is flipped, a positioning rod slidably disposed on the fixed post and located in the sliding inner hole for inserting into the corresponding insertion hole after the corresponding insertion hole is aligned with the position of the sliding inner hole to limit the flipping of the control seat on the connecting frame, a limiting head disposed on the positioning rod and located on one side of the fixed post, and a tension spring disposed between the limiting head and the fixed post and sleeved on the fixed post.

[0029] Further effect: When it is necessary to release the head of the connecting frame from the side end face of the control seat, pull the limiting head outward to drive the positioning rod to slide out of the corresponding socket. At this time, the tension spring is stretched to generate elastic potential energy, which then drives the control seat to flip on the head of the connecting frame. After the control seat flips 180°, the sliding inner hole corresponds to the position of the corresponding socket. The tension spring releases elastic potential energy to pull the limiting head to drive the positioning rod to insert into the corresponding socket, thereby fixing the flipped control seat to the upper end of the connecting frame.

[0030] A further improvement is that an inner pipe is provided on the melting tube, and a contact core is provided at the right end of the melting tube inside the inner pipe, with one end of the contact core in contact with the contact copper piece;

[0031] The tail copper sleeve is provided with a through hole for the molten tube to slide in the tail copper sleeve. The through hole is used to allow the contact copper part to contact the upper contact after the molten tube is fully pushed into the tail copper sleeve, and to allow the contact copper part to disengage from the upper contact when the molten tube slides out of the tail copper sleeve.

[0032] A fuse is provided between the other end of the contact core and the tail copper sleeve. The fuse is used to fix the fuse tube after it is fully pushed into the tail copper sleeve when it has not melted, and to stop fixing the fuse tube after it has melted. One end of the fuse is connected to the other end of the contact core and is located in the inner tube, and the other end of the fuse is fixedly connected to the tail copper sleeve.

[0033] Further effects: The contact core, which is in conductive contact with the copper contact element, is electrically connected to the tail copper sleeve via a fuse. When the fuse is not blown, the current is transmitted through the upper contact to the copper contact element, then through the copper contact element to the contact core, and through the fuse to the tail copper sleeve. Finally, the current is transmitted through the conductive rod to the lower fixed base, thus achieving a closed circuit.

[0034] Further effect: Since most of the fuses are installed at an angle, the fuse tube is held in a downward sliding position by its own weight. The fuse wire restricts the sliding of the fuse tube in the hole. When the current is too large and the fuse wire melts and breaks, the fuse tube slides out of the hole by its own weight, thereby allowing the upper contact to disengage from the contact copper part and realizing the circuit is disconnected.

[0035] A further improvement is that a connecting pull ring is provided at the other end of the fuse, and the connecting pull ring is fixedly installed on the tail copper sleeve by screws or bolts.

[0036] Further effect: When installing the fuse, tighten the other end of the fuse to press the left end of the fuse tube against the left end of the tail copper sleeve, and place the connecting pull ring on the outer periphery of the tail copper sleeve. Secure the connecting pull ring to the tail copper sleeve with screws or bolts.

[0037] A further improvement is that: an extended slot is provided at the left end of the tail copper sleeve, an outer ring seat is provided at the left end of the fusion tube, the outer ring seat is clearance-fitted with the extended slot, and a compression spring is provided between the tail copper sleeve and the outer ring seat within the extended slot.

[0038] Further benefits: After the fusible tube is fully pushed into the tail copper sleeve, the compression spring is compressed and generates elastic potential energy, which presses the pushed-in fusible tube tightly against the left end of the tail copper sleeve through the fuse. When the fuse melts and breaks, the compression spring releases elastic potential energy to push the outer ring seat and drive the fusible tube to slide out of the through hole in the tail copper sleeve, thereby automatically disengaging the upper contact from the contact copper part. This can quickly achieve the circuit disconnection state, and the disconnection point can be clearly observed by the staff after the fusible tube pops out, making the disconnection state easier to observe.

[0039] After adopting the above technical solution, the beneficial effects of the present invention are as follows: When it is necessary to disassemble the fuse body, the release lever of the control seat is aligned with the mounting hole and inserted, so that the release lever drives the limiting member to disengage from the locking step, allowing the tail copper sleeve to move to the left in the mounting hole. At this time, the fuse tube can be pulled to the left to disengage it from the fixed base, thereby completing the disassembly of the fuse tube from the upper contact and the lower fixed base. When it is necessary to install the fuse tube after maintenance, the fuse tube is aligned with the mounting hole and inserted, so that the fuse tube moves to the right and drives the copper contact part to come close to the upper contact. The limiting member is locked in the locking step to restrict the tail copper sleeve from moving to the left in the mounting hole, thereby fixing the fuse tube between the upper contact and the lower fixed base. Compared with the structure of the traditional drop-out fuse, it can be operated by a straight-in and straight-out method. The operator does not need to precisely control the movement of the tail of the fuse tube to make an arc-shaped movement trajectory, so that the installation and disassembly of the fuse tube can be realized, and the maintenance operation is more convenient.

[0040] Further benefits: During normal use, the fuse can be installed at an angle. After the limiting piece disengages from the locking step, the fuse tube can slide down into the mounting hole under its own weight. During installation, simply push the fuse tube diagonally upwards to move it in the mounting hole, and the limiting piece will lock it into the locking step to restrict the movement of the tail copper sleeve in the mounting hole. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of the present invention;

[0043] Figure 2 This is a schematic diagram of the control base in this invention;

[0044] Figure 3 This is a front sectional view of the lower fixing base and the fuse body in this invention;

[0045] Figure 4 This is a front sectional view of the lower fixing seat in this invention;

[0046] Figure 5 This is a front sectional view of the control seat in this invention;

[0047] Figure 6 This is a front sectional view of the control base and the tail copper sleeve in this invention;

[0048] Figure 7This is a structural schematic diagram of the control base and connecting frame in this invention;

[0049] Figure 8 This is a schematic diagram of the control base in this invention;

[0050] Figure 9 This is a cross-sectional view of the control base and connecting frame in this invention;

[0051] Figure 10 It corresponds Figure 9 Enlarged view of part A;

[0052] Figure 11 This is a schematic diagram of the fuse body in this invention;

[0053] Figure 12 This is a cross-sectional view of the fuse body in this invention.

[0054] Explanation of reference numerals in the attached drawings: 1. Fixed base; 2. Insulator; 3. Upper contact; 4. Lower fixed seat; 5. Fusible tube; 6. Contact copper part; 7. Tail copper sleeve; 8. Conductive through hole; 9. Conductive rod; 10. Mounting through hole; 11. Engaging step; 12. Control seat; 13. Release rod; 14. Clearance opening; 15. Limiting opening; 16. Limiting block; 17. Push spring; 18. Limiting plate; 19. Clearance through hole; 20. Protective sleeve head; 21. Auxiliary locking hole; 22. Auxiliary locking block; 23. Check block; 24. Side opening; 25. Limiting plate; 26. Inclined cone surface; 27. Connecting frame; 28. Fixed column; 29. ​​Sliding inner hole; 30. Corresponding insertion hole; 31. Positioning rod; 32. Limiting head; 33. Tension spring; 34. Inner pipe; 35. Contact core; 36. Through hole; 37. Fusible wire; 38. Extension slot; 39. Outer ring seat; 40. Compression spring; 41. Secondary step. Detailed Implementation

[0055] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0056] See Figures 1 to 12 As shown, the technical solution adopted in this specific embodiment is: a fuse that is easy to disassemble and maintain, including a fixed base 1, two insulators 2 disposed at the upper end of the fixed base 1, an upper contact 3 and a lower fixed seat 4 respectively fixed on the two insulators 2, and a fuse body disposed between the upper contact 3 and the lower fixed seat 4. The fuse body includes a fuse tube 5, a contact copper piece 6 disposed at the right end of the fuse tube 5, a tail copper sleeve 7 disposed on the periphery of the left end of the fuse tube 5, a conductive through hole 8 opened on the lower fixed seat 4, and a conductive rod 9 with one end disposed on the tail copper sleeve 7 and the other end located in the conductive through hole 8.

[0057] A mounting hole 10 is provided through the lower fixed base 4 for the tail copper sleeve 7 to move to the right on the lower fixed base 4. A locking step 11 is provided on the tail copper sleeve 7. A limiting member is provided on the lower fixed base 4 for the tail copper sleeve 7 to engage with the locking step 11 after moving to the right, thus limiting the tail copper sleeve 7 to move to the left in the mounting hole 10. A control base 12 is detachably provided on the left side of the lower fixed base 4. A release rod 13 is fixedly provided on the control base 12 for driving the limiting member to disengage from the locking step 11 after being pushed to the right into the mounting hole 10, allowing the tail copper sleeve 7 to move to the left in the mounting hole 10. The inner diameter of the release rod 13 is clearance-fitted with the outer diameter of the tail copper sleeve 7, and the outer diameter of the release rod 13 is clearance-fitted with the mounting hole 10. A clearance opening 14 is provided on the control base 12 for avoiding the conductive rod 9. Figure 9 , Figure 10 As shown, the engaging step 11 is provided on the tail copper sleeve 7 in the form of a groove or an annular recess. The lower fixing seat 4 is made of conductive material and is connected to the insulator 2. The contact copper part 6 is installed on the right end of the fuse tube 5 by threads. An arc-extinguishing conductive tube is also provided in the clearance opening 14.

[0058] The limiting component includes a limiting opening 15 formed on the lower fixed base 4 and connected to the mounting through hole 10, and a limiting block 16 with one end rotatably disposed on the lower fixed base 4 within the limiting opening 15 and the other end located within the mounting through hole 10. The limiting block 16 is inclined.

[0059] like Figure 4 As shown, a flat surface is provided on the upper part of one end of the limiting block 16. A slight gap exists between this flat surface and the lower fixed base 4, located at the top of the limiting opening 15. This gap allows the upper end of the limiting block 16 to rest against the top of the limiting opening 15 when the limiting block 16 is flipped downwards, thus preventing the limiting block 16 from excessively flipping downwards and disengaging from its optimal position. One end of the limiting block 16 can rotate within the limiting opening 15 via a conventional hinge or a rod and slot connection.

[0060] A push spring 17 is provided between the lower fixed base 4 and the other end of the limiting block 16, and the push spring 17 is located in the limiting opening 15. A spring groove is provided on the other end of the limiting block 16, and the push spring 17 is placed in the spring groove. In order to facilitate the installation of the push spring 17, the limiting opening 15 can be set through, and then a sealing plate is set in the limiting opening 15. After the limiting block 16 is installed into the limiting opening 15, the sealing plate is then installed into the limiting opening 15 and fixed in the limiting opening 15 by bolts or welding. Alternatively, the sealing plate can be omitted, and one end of the push spring 17 can be fixed in the spring groove on the other end of the limiting block 16 by adhesive or welding.

[0061] The side end face of the lower fixed base 4 is provided with a limiting plate 18 for limiting the tail copper sleeve 7 to move to the right in the mounting hole 10 when the limiting member restricts the tail copper sleeve 7 to move to the left. The limiting plate 18 is provided with a clearance hole 19 for the molten tube 5 and the contact copper part 6 to pass through.

[0062] The diameter of the clearance hole 19 is larger than the diameter of the fusible tube 5 and the contact copper part 6, but smaller than the diameter of the tail copper sleeve 7. The limiting plate 18 is integrally formed with the lower fixing seat 4. When the limiting plate 18 is not set, the contact copper part 6 abuts against or is close to one side of the upper contact 3, which can also limit the movement of the fusible tube 5. However, the setting of the limiting plate 18 can directly contact and limit the movement of the tail copper sleeve 7 without the contact copper part 6 contacting the upper contact 3, which can reduce the phenomenon of wear caused by the contact copper part 6 hitting the upper contact 3.

[0063] A protective sleeve 20 is fixedly provided on the upper contact 3 to protect the copper contact part 6. The protective sleeve 20 is in clearance fit with the copper contact part 6.

[0064] The protective sleeve 20 is a PTFE arc-extinguishing sleeve. The PTFE arc-extinguishing sleeve can protect the contacts, prevent oxidation, and extinguish the arc between the copper contact 6 and the upper contact 3 when the copper contact 6 is separated from the upper contact 3, effectively preventing the contacts from burning and sticking.

[0065] The control base 12 is provided with an auxiliary locking hole 21. The tail copper sleeve 7 is provided with a secondary step 41 that corresponds to the position of the auxiliary locking hole 21 after the release rod is pushed into the mounting hole 10 to the right. An auxiliary locking block 22 is provided on the control base inside the auxiliary locking hole 21. One end of the auxiliary locking block 22 is hinged to the control base 12 inside the auxiliary locking hole 21. The lower end of the auxiliary locking block 22 is provided with a check block 23 that is engaged in the secondary step 41 after the auxiliary locking hole 21 corresponds to the position of the secondary step 41.

[0066] One end of the auxiliary locking block 22 can rotate in the auxiliary locking hole 21 via a conventional hinge or a rod and slot. To improve the locking effect of the auxiliary locking block 22, a spring is also provided between the other end of the auxiliary locking block 22 and the control base 12, and inside the auxiliary locking hole 21. Two sets of auxiliary locking holes 21, auxiliary locking blocks 22, and check blocks 23 can be provided and symmetrically arranged on the control base 12. However, in this case, to prevent the lower auxiliary locking block 22 from failing to rotate automatically due to gravity, a spring is needed to ensure that the auxiliary locking block 22 and the check block 23 can automatically engage.

[0067] like Figure 5As shown, the back of the auxiliary locking block 22 is an inclined surface, so that the auxiliary locking block 22 is less likely to get stuck during rotation, allowing the auxiliary locking block 22 to rotate smoothly. In the structure of the check block 23, the left end face of the check block 23 is a vertical surface. After it is inserted into the sub-step 41, this vertical surface contacts the left end vertical surface of the sub-step 41, so that when the control seat 12 is pulled out, the tail copper sleeve 7 can be taken out from the lower fixed seat 4.

[0068] An inclined surface is provided on the right end face of the check block 23. When the control seat 12 drives the release rod 13 to insert into the mounting hole 10 to the right, the inclined surface contacts the tail copper sleeve 7 and drives the auxiliary locking block 22 to rotate upward. Alternatively, the inclined surface can be placed on the left end face of the tail copper sleeve 7 instead of the right end of the check block 23. When the control seat 12 drives the release rod 13 to insert into the mounting hole 10 to the right, the inclined surface can also push the check block 23 to drive the auxiliary locking block 22 to rotate upward.

[0069] The side end face of the control base 12 is provided with a side opening 24 that is connected to the auxiliary card hole 21. The auxiliary card block 22 is provided with a limiting plate 25 for rotating the auxiliary card block 22 when it is pressed, so that the check block 23 is disengaged from the sub-step 41. One end of the limiting plate 25 is fixedly provided on the side end face of the auxiliary card block 22, the other end is located on the outside of the control base 12, and the middle part is located in the side opening 24.

[0070] An inclined conical surface 26 is provided on the copper contact part 6.

[0071] The control base 12 is provided with a connecting bracket 27 for connecting to the head of the insulating operating rod. The lower end of the connecting bracket 27 is fixedly connected to the head of the insulating operating rod, and the upper end of the connecting bracket 27 is connected to the left and right side faces of the control base 12.

[0072] The head of the insulating operating rod is fixedly connected to the lower end of the connecting frame 27 by bolts.

[0073] The lower end of the connecting frame 27 is connected to the head of the insulating operating rod, and the upper end of the connecting frame 27 is hinged to the side end face of the control seat 12. A positioning element for fixing or unfixing the head of the connecting frame 27 to the side end face of the control seat 12 is provided between the head of the connecting frame 27 and the side end face of the control seat 12.

[0074] The upper left and right sides of the connecting frame 27 are hinged to the left and right sides of the control base 12.

[0075] The positioning components include a fixed post 28 disposed at the upper end of the connecting frame 27, a sliding inner hole 29 opened on the fixed post 28, a corresponding insertion hole 30 opened on the side end face of the control seat 12 for corresponding to the position of the sliding inner hole 29 after the control seat 12 is flipped, a positioning rod 31 slidably disposed on the fixed post 28 and located in the sliding inner hole 29 for inserting into the corresponding insertion hole 30 after the position of the corresponding insertion hole 30 corresponds to the position of the sliding inner hole 29 to restrict the flipping of the control seat 12 on the connecting frame 27, a limiting head 32 disposed on the positioning rod 31 and located on one side of the fixed post 28, and a tension spring 33 disposed between the limiting head 32 and the fixed post 28 and sleeved on the fixed post 28.

[0076] like Figures 7 to 9 As shown, the fixing post 28 is vertically arranged on the side end face of the connecting frame 27. There are two corresponding insertion holes 30 on one side of the control base 12, and the two corresponding insertion holes 30 are arranged obliquely and symmetrically. The limiting head 32 is fixedly arranged on the positioning rod 31. The diameter of the limiting head 32 is larger than the diameter of the sliding inner hole 29. The two ends of the tension spring 33 are respectively fixed between the limiting head 32 and the fixing post 28.

[0077] An inner pipe 34 is provided on the fuse tube 5. A contact core 35 is provided at the right end of the fuse tube 5 inside the inner pipe 34. One end of the contact core 35 is in contact with the contact copper piece 6.

[0078] The tail copper sleeve 7 is provided with a through hole 36 for the melting tube 5 to slide in the tail copper sleeve 7. The through hole 36 is used to allow the contact copper part 6 to contact the upper contact 3 after the melting tube 5 is fully pushed into the tail copper sleeve 7, and to allow the contact copper part 6 to disengage from the upper contact 3 when the melting tube 5 slides out of the tail copper sleeve 7.

[0079] A fuse 37 is provided between the other end of the contact core 35 and the tail copper sleeve 7. The fuse 37 is used to fix the fuse tube 5 after it is fully pushed into the tail copper sleeve 7 when it has not melted, and no longer fixes the fuse tube 5 after it melts. One end of the fuse 37 is connected to the other end of the contact core 35 and is located in the inner pipe 34. The other end of the fuse 37 is fixedly connected to the tail copper sleeve 7.

[0080] The contact core 35 is a conductive core that works with the contact copper part 6 to form a conductive process. The fuse tube 5 is made of insulating material and mainly performs a dual function: serving as a mechanical support and electrical insulation carrier for the fusible element, ensuring that the fusible element is isolated from the external environment under normal operating conditions, and providing reliable electrical insulation protection when the circuit is working normally, preventing short circuits or leakage caused by contact between the fusible element and the external circuit or environment. The fuse wire 37 is made of traditional fuse wire materials such as pure copper wire or pure silver wire.

[0081] The other end of the fuse 37 is provided with a connecting pull ring (not shown in the figure), which is fixedly installed on the tail copper sleeve 7 by screws or bolts.

[0082] A connecting hole is provided on the periphery of the tail copper sleeve 7. A screw or bolt is threaded into the connecting hole. The head of the screw or bolt is larger than the inner diameter of the connecting pull ring, and the screw or bolt shank passes through the connecting pull ring (not shown in the figure) and is threaded into the connecting hole.

[0083] An extended slot 38 is provided at the left end of the tail copper sleeve 7, and an outer ring seat 39 is provided at the left end of the fusion tube 5. The outer ring seat 39 and the extended slot 38 are fitted with a clearance. A compression spring 40 is provided between the tail copper sleeve 7 and the outer ring seat 39 within the extended slot 38.

[0084] The compression spring 40 abuts between the outer ring seat 39 and the tail copper sleeve 7. Alternatively, the compression spring 40 can be fixed between the outer ring seat 39 and the tail copper sleeve 7 by adhesive bonding or brazing.

[0085] The working principle of this invention is as follows: When the fuse body needs to be disassembled, the release lever 13 of the control seat 12 is aligned with the mounting hole 10 and inserted. The outer diameter of the release lever 13 pushes the other end of the limiting block 16 upward to flip and disengage from the locking step 11. The position of the secondary step 41 corresponds to that of the check block 23. At this time, the auxiliary locking block 22 is flipped downward by its own weight (or by the driving force of the spring after installation) so that the check block 23 enters the secondary step 41. When the control seat 12 is pulled outward, the check block 23 can drive the tail copper sleeve 7 to remove the fuse tube 5 from the mounting hole 10, thereby completing the disassembly of the fuse tube 5 from the upper contact 3 and the lower fixing seat 4. When the fuse tube 5 needs to be installed after maintenance, the fuse tube 5 is aligned with the mounting hole 10 and inserted. The other end of the limiting block 16... The end contacts the tail copper sleeve 7. As the tail copper sleeve 7 moves to the right, the limiting block 16 flips upward around one end until the position of the engaging step 11 is completely aligned with the limiting opening 15. Then, the limiting block 16 flips downward around one end due to its own weight. The inclined limiting block 16 is locked in the engaging step 11. When the fuse tube 5 is pushed to the left by external force, the limiting block 16 cannot continue to flip downward, thus restricting the fuse tube 5 from moving the tail copper sleeve 7 to the left. This achieves the fixation of the fuse tube 5 between the upper contact 3 and the lower fixing seat 4. Compared with the structure of traditional drop-out fuses, it can be operated by a straight-in and straight-out method. The operator does not need to precisely control the movement of the tail of the fuse tube 5 to make an arc-shaped movement trajectory. The installation and disassembly of the fuse tube 5 can be achieved, and the operation is relatively simple.

[0086] The inclined conical surface 26 allows the molten tube 5 to automatically fit into the mounting hole 10 or the clearance hole 19 of the limiting plate 18 when it is pulled out from the lower fixed seat 4. Compared with the traditional setting of the transition surface between the contact copper part 6 and the molten tube 5 as a right angle, the right angle setting is easy to get stuck in the mounting hole 10 or the clearance hole 19 of the limiting plate 18 when the molten tube 5 is pulled out, which will easily generate resistance when pulling out. The inclined conical surface 26 provides a transition at the junction between the contact copper part 6 and the molten tube 5, and it is not easy to get stuck in the mounting hole 10 or the clearance hole 19 of the limiting plate 18 when pulling out, so the removal is smoother and can play the role of quick positioning, installation and disassembly.

[0087] When the fuse is installed at a high place, it is convenient for the staff to operate the control base 12 to drive the release rod 13 into the installation hole 10, which improves the convenience of fuse installation and removal. Moreover, the hand-held insulated operating rod can protect the staff and reduce the occurrence of electric shock.

[0088] The control base 12 is divided into a head and a tail. To release the fuse body from its position on the tail copper sleeve 7, the release lever 13 at the head of the control base 12 is used. When the fuse body needs to be installed on the lower fixed base 4, the limiting head 32 is pulled outwards to slide the positioning lever 31 out of the corresponding socket 30. At this time, the tension spring 33 is stretched, generating elastic potential energy, releasing the head of the connecting bracket 27 from the side end face of the control base 12. Then, the control base 12 is rotated 180 degrees, and the sliding inner hole 29 is aligned with this position. The corresponding position of the socket 30 is corresponding to the position of the tension spring 33. The tension spring 33 releases elastic potential energy to pull the limit head 32 and drive the positioning rod 31 to insert into the corresponding socket 30, thereby fixing the flipped control seat 12 to the upper end of the connecting frame 27. The tail copper sleeve 7 is inserted into the tail of the release rod 13, and the tail copper sleeve 7 is supported by the auxiliary card block 22 on the locking step 11. The worker drives the control seat 12 to align the fuse with the installation hole 10 and insert it, so as to facilitate installation when working at height.

[0089] Since the internal structure of the control base 12 needs to cooperate with the internal structure of the lower fixed base 4 to realize the installation and disassembly of the fuse tube 5, the control base 12 can serve as a unique and dedicated installation tool, which can effectively prevent unauthorized personnel from performing illegal operations and improve the working safety of the fuse.

[0090] The protective sleeve 20 can prevent the copper contact 6 from being exposed to the outside air for a long time, thereby reducing the impact of cavitation on the copper contact 6 and increasing the service life of the copper contact 6.

[0091] When installing fuse 37, tighten the other end of fuse 37 to press the left end of fuse tube 5 against the left end of tail copper sleeve 7, and place the connecting pull ring on the outer periphery of tail copper sleeve 7. Secure the connecting pull ring to tail copper sleeve 7 with screws or bolts.

[0092] After the fuse tube 5 is fully pushed into the tail copper sleeve 7, the compression spring 40 is compressed and generates elastic potential energy, which presses the pushed-in fuse tube 5 against the left end of the tail copper sleeve 7 through the fuse 37. When the fuse 37 melts and breaks, the compression spring 40 releases elastic potential energy to push the outer ring seat 39 and drive the fuse tube 5 to slide out of the through hole 36 of the tail copper sleeve 7, thereby automatically disengaging the upper contact 3 from the contact copper part 6. This can quickly achieve the circuit disconnection state, and the disconnection point can be clearly observed by the staff after the fuse tube 5 pops out, making the disconnection state easier to observe.

[0093] This invention protects the product's structure. The model numbers of the components are not protected by this invention, as they are common technology. Any component on the market that can achieve the functions described above can be used as a fuse that is easy to disassemble and maintain. Therefore, the model numbers and other parameters of the components are not described in detail in this invention. The contribution of this invention lies in the scientific combination of the various components.

[0094] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents. Any aspects not detailed in the present invention are well-known to those skilled in the art.

Claims

1. A fuse that is easy to disassemble and maintain, comprising a fixed base, two insulators disposed at the upper end of the fixed base, an upper contact and a lower fixing seat respectively fixedly disposed on the two insulators, and a fuse body disposed between the upper contact and the lower fixing seat, characterized in that: The fuse body includes a fuse tube, a contact copper piece disposed at the right end of the fuse tube, a tail copper sleeve disposed on the periphery of the left end of the fuse tube, a conductive through hole opened on the lower fixed seat, and a conductive rod with one end disposed on the tail copper sleeve and the other end located in the conductive through hole. The lower fixing seat has a through hole for the tail copper sleeve to move to the right on the lower fixing seat. The tail copper sleeve has a locking step. The lower fixing seat has a limiting member for locking into the locking step after the tail copper sleeve moves to the right, thereby limiting the tail copper sleeve to move to the left in the mounting hole. The left side of the lower fixing seat is detachably provided with a control seat. The control seat has a release rod for driving the limiting member to disengage from the locking step after being pushed to the right into the mounting hole of the lower fixing seat, so that the tail copper sleeve can move to the left in the mounting hole. The inner diameter of the release rod is clearance-fitted with the outer diameter of the tail copper sleeve, and the outer diameter of the release rod is clearance-fitted with the mounting hole. The control seat has a clearance opening for avoiding the conductive rod. The control base is provided with an auxiliary locking hole, and the tail copper sleeve is provided with a secondary step corresponding to the position of the auxiliary locking hole after the release rod is pushed into the mounting hole to the right. An auxiliary locking block is provided on the control base inside the auxiliary locking hole. One end of the auxiliary locking block is hinged to the control base inside the auxiliary locking hole. The lower end of the auxiliary locking block is provided with a check block for locking into the secondary step after the auxiliary locking hole and the secondary step are aligned. The control base has a side opening on its side end face, which is connected to the auxiliary card hole. The auxiliary card block is provided with a limiting plate for rotating the auxiliary card block under pressure to disengage the check block from the sub-step. One end of the limiting plate is fixedly set on the side end face of the auxiliary card block, the other end is located on the outside of the control base, and the middle part is located in the side opening.

2. The fuse for easy disassembly and maintenance according to claim 1, characterized in that: The limiting component includes a limiting opening formed on the lower fixed base and connected to the mounting through hole, and a limiting block with one end rotatably disposed on the lower fixed base within the limiting opening and the other end located within the mounting through hole, wherein the limiting block is inclined.

3. A fuse that is easy to disassemble and maintain according to claim 2, characterized in that: A push spring is provided between the lower fixed seat and the other end of the limiting block, and the push spring is located in the limiting opening.

4. A fuse that is easy to disassemble and maintain according to claim 1, characterized in that: The side end face of the lower fixed seat is provided with a limiting plate for limiting the tail copper sleeve to move to the right in the mounting hole when the limiting member restricts the tail copper sleeve to move to the left. The limiting plate is provided with a clearance hole for the molten tube and the contact copper part to pass through.

5. A fuse that is easy to disassemble and maintain according to claim 1, characterized in that: A protective sleeve for protecting the copper contact component is fixedly provided on the upper contact, and the protective sleeve is fitted with the copper contact component with a clearance.

6. A fuse that is easy to disassemble and maintain according to claim 1, characterized in that: The contact copper component is provided with an inclined conical surface.

7. A fuse that is easy to disassemble and maintain according to claim 1, characterized in that: The control base is provided with a connecting frame for connecting to the head of the insulating operating rod. The lower end of the connecting frame is fixedly connected to the head of the insulating operating rod, and the upper end of the connecting frame is connected to the left and right side faces of the control base.

8. A fuse that is easy to disassemble and maintain according to claim 7, characterized in that: The lower end of the connecting frame is connected to the head of the insulating operating rod, and the upper end of the connecting frame is hinged to the side end face of the control seat. A positioning element for fixing or unfixing the head of the connecting frame to the side end face of the control seat is provided between the head of the connecting frame and the side end face of the control seat.

9. A fuse that is easy to disassemble and maintain according to claim 8, characterized in that: The positioning component includes a fixed post disposed at the upper end of the connecting frame, a sliding inner hole opened on the fixed post, a corresponding insertion hole opened on the side end face of the control seat for corresponding to the position of the sliding inner hole after the control seat is flipped, a positioning rod slidably disposed on the fixed post and located in the sliding inner hole for inserting into the corresponding insertion hole after the corresponding insertion hole is aligned with the position of the sliding inner hole to limit the flipping of the control seat on the connecting frame, a limiting head disposed on the positioning rod and located on one side of the fixed post, and a tension spring disposed between the limiting head and the fixed post and sleeved on the fixed post.

10. A fuse that is easy to disassemble and maintain according to claim 1, characterized in that: The molten tube has an inner pipe, and a contact core is located at the right end of the molten tube inside the inner pipe. One end of the contact core is in contact with the contact copper piece. The tail copper sleeve is provided with a through hole for the molten tube to slide in the tail copper sleeve. The through hole is used to allow the contact copper part to contact the upper contact after the molten tube is fully pushed into the tail copper sleeve, and to allow the contact copper part to disengage from the upper contact when the molten tube slides out of the tail copper sleeve. A fuse is provided between the other end of the contact core and the tail copper sleeve. The fuse is used to fix the fuse tube after it is fully pushed into the tail copper sleeve when it has not melted, and to stop fixing the fuse tube after it has melted. One end of the fuse is connected to the other end of the contact core and is located in the inner tube, and the other end of the fuse is fixedly connected to the tail copper sleeve.

11. A fuse that is easy to disassemble and maintain according to claim 10, characterized in that: The other end of the fuse is provided with a connecting pull ring, which is fixedly installed on the tail copper sleeve by screws or bolts.

12. A fuse that is easy to disassemble and maintain according to claim 10, characterized in that: An extended slot is provided at the left end of the tail copper sleeve, and an outer ring seat is provided at the left end of the fusion tube. The outer ring seat is in clearance fit with the extended slot, and a compression spring is provided between the tail copper sleeve and the outer ring seat within the extended slot.

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