Quick tripping transmission device of drop-out fuse and use method

Abstract

The invention discloses a quick tripping transmission device of a drop-out fuse and a use method, and relates to the technical field of power distribution network power equipment. The device comprises a support, a transmission gear, a transmission arm, a restraining part and a driving mechanism. The transmission gear is rotatably arranged on the support, one end of the transmission arm is fixed to the transmission gear, the restraining part is fixed to the other end of the transmission arm and used for supporting the fuse tube and restraining the fuse tube to move along a preset path, and the output end of the driving mechanism is meshed with the transmission gear and can drive the transmission gear to rotate to the locking and releasing position. When the transmission gear rotates to a locking position, the transmission arm and the restraining part are driven to be in a locking state, the fuse tube is supported, and displacement is limited. The driving mechanism responds to a fuse signal, drives the transmission gear to rotate to a release position and relieves the driving force, and the transmission gear rapidly and reversely rotates under the action of the gravity of the fuse tube and the arc thrust to drive the transmission arm and the constraint component to synchronously move, so that the constraint component relieves the constraint on the fuse tube; the fuse tube rapidly drops along a predetermined path to realize rapid circuit breaking, and the device is simple in structure and convenient to use, effectively solves the problem of breaking obstruction, and ensures high action reliability.

Description

Technical Field

[0001] This invention relates to the field of power distribution network equipment technology, and in particular to a fast tripping transmission device and its usage method for a drop-out fuse. Background Technology

[0002] As a core overcurrent protection device, the fuse is widely used in high and low voltage power distribution systems, control systems, and various electrical equipment. Its core function is to quickly isolate the faulty circuit by triggering the fuse tube to drop when a short circuit or overcurrent fault occurs. In actual operation of the power distribution network, when the fault current exceeds the specified threshold, the fuse wire in the fuse quickly melts, and then the fuse tube needs to drop in time under the action of the transmission structure to cut off the fault circuit.

[0003] However, the transmission structure of existing conventional drop-out fuses has many defects, making it difficult to meet the requirements of complex outdoor environments in terms of operational reliability: First, conventional fuses rely on the weight of the fuse tube itself to drop, and often use methods such as pull ropes to control the action. The pull rope remains connected to the fuse tube during the drop, forming a mechanical obstruction. At the same time, the overall action is easily affected by external factors such as wind force, installation angle, and rain impact, resulting in delayed disconnection or false tripping, and failing to isolate faults in a timely manner. Second, the contact pressure is maintained only by the initial preload of the spring sheet. Under the fatigue effect of long-term operation or the instantaneous impact of short-circuit current, the elasticity of the spring sheet is easily deteriorated, resulting in a drop in contact pressure, causing problems such as poor contact and overheating, and in severe cases, it may expand the scope of the fault. Third, the fixing method of the fuse tube to the bracket and transmission structure is simple, and there is a safety hazard of accidental drop under the action of extreme external forces such as strong winds. In addition, after the fuse trips, maintenance personnel need to climb and approach the live part to replace the fuse tube or fuse, which is inefficient and poses a great risk to personal safety.

[0004] Given the shortcomings of the existing technologies, developing a fast-tripping, reliable, and easy-to-maintain drop-out fuse transmission structure has become an urgent need for upgrading power distribution network equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a fast tripping transmission device and method for use of a drop-out fuse, so as to solve the problems existing in the prior art. It has a simple structure, is easy to use, effectively solves the problem of interruption, and effectively ensures high reliability of operation.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a quick-tripping transmission device for a drop-out fuse, comprising: a bracket, a transmission gear, a transmission arm, a restraining component, and a driving mechanism. The transmission gear is rotatably mounted on the bracket. One end of the transmission arm is fixedly connected to the transmission gear. The restraining component is fixedly connected to the other end of the transmission arm, and the restraining component is used to support and connect with the fuse tube of the fuse and can restrain the fuse tube from moving along a predetermined path. The output end of the driving mechanism is meshed with the transmission gear and can drive the transmission gear to rotate to a locked position and a released position. When in the stop position, the transmission gear drives the transmission arm and the constraint component to move to the locked state, so as to effectively support the fuse tube and restrict its displacement; the drive mechanism responds to the fuse wire blowing signal of the fuse and drives the transmission gear to rotate to the release position. The drive mechanism releases the driving force on the transmission gear, and the transmission gear rotates rapidly in the opposite direction under the combined action of the fuse tube's own weight and the electric arc thrust, thereby driving the transmission arm and the constraint component to move synchronously, so that the constraint component releases the constraint on the fuse tube, and the fuse tube falls rapidly along a predetermined path to achieve rapid circuit disconnection.

[0007] Preferably, the predetermined path is a path in a vertical plane, and the constraint member is configured to prevent the fuse tube from swaying in a direction perpendicular to the predetermined path.

[0008] Preferably, the constraint component is a bushing fitted around the outside of the fuse tube, the bushing being fixedly connected to the transmission arm and slidingly engaged with the fuse tube.

[0009] Preferably, the bushing is made of stainless steel.

[0010] Preferably, the transmission arm is a push rod, one end of which is fixedly connected to the bushing, and the other end is fixedly connected to the transmission gear.

[0011] Preferably, the drive mechanism includes a reciprocating motor, a reciprocating connecting rod, a gear connecting rod, and a sector gear. The center of the sector gear is rotatably connected to the bracket. The gear connecting rod is hinged to the top end of the outer periphery of the sector gear, and its other end is hinged to one end of the reciprocating connecting rod. The output shaft of the reciprocating motor is fixedly connected to the other end of the reciprocating connecting rod to drive the reciprocating connecting rod to move back and forth in the horizontal direction. The sector gear can mesh with the transmission gear.

[0012] Preferably, the arc length of the sector gear is such that when the transmission gear in its free state is rotated to the locked position, it maintains stable meshing with the sector gear.

[0013] Preferably, the arc length of the sector gear is half the circumference of the transmission gear.

[0014] Preferably, both the transmission gear and the sector gear are hardened gears.

[0015] The present invention also provides a method of using the quick-tripping transmission device for a drop-out fuse as described in any of the preceding claims, comprising the following steps: Under normal flow conditions, the drive mechanism drives the transmission gear and keeps it in the locked position, so that the constraint component provides effective support and constraint for the fuse tube; In response to a trigger signal indicating that the fuse of the fuse has blown, the output end of the drive mechanism is controlled to drive the transmission gear to rotate to the release position and release the lock on the rotation of the transmission gear; After being unlocked, the transmission gear rotates rapidly in the opposite direction under the combined action of the fuse tube's own weight and the electric arc thrust, thereby driving the restraint component to move to release the restraint on the fuse tube, causing the fuse tube to fall rapidly along a predetermined path.

[0016] The present invention achieves the following technical effects compared to the prior art: The purpose of this invention is to provide a rapid tripping transmission device and method for using a drop-out fuse. This device, through the meshing transmission of a drive mechanism and a transmission gear, combined with the linkage design of the transmission arm and the constraint component, achieves rapid release and precise drop of the fuse tube in the event of a fault. Compared to traditional structures relying on gravity and pull rope control, this invention innovatively introduces a dual protection mechanism combining electric drive and mechanical locking: During normal operation, the drive mechanism locks the transmission gear in the locked position, and the constraint component provides stable support for the fuse tube through the rigid connection between the bushing and the push rod, effectively resisting external interference such as strong winds; when a fault occurs, the drive mechanism quickly drives the transmission gear to switch to the release position, releasing the constraint on the transmission arm. At this time, under the combined action of its own gravity and the thrust of the electric arc, the fuse tube pushes the transmission gear to rotate rapidly in the opposite direction, causing the constraint component to simultaneously disengage from the support position, ensuring that the fuse tube falls unimpeded along a predetermined vertical path, significantly improving the breaking response speed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0018] Figure 1 A schematic diagram of the structure of the quick tripping transmission device for the drop-out fuse provided by the present invention; Figure 2A front view of the quick-tripping transmission device for the drop-out fuse provided by the present invention; Figure 3 A simplified kinematic diagram of the quick-tripping transmission device for a drop-out fuse provided by the present invention; In the diagram: 1. Fuse; 2. Bushing; 3. Push rod; 4. Fuse tube; 5. Transmission gear; 6. Sector gear; 7. Gear connecting rod; 8. Reciprocating connecting rod; 9. Reciprocating motor. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a fast tripping transmission device and method for use of a drop-out fuse, so as to solve the problems existing in the prior art. It has a simple structure, is easy to use, effectively solves the problem of interruption, and effectively ensures high reliability of operation.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 This invention provides a quick-tripping transmission device for a drop-out fuse, as shown in Figures 1-3, comprising: a bracket, a transmission gear 5, a transmission arm, a constraint component, and a drive mechanism. The transmission gear 5 is rotatably mounted on the bracket; one end of the transmission arm is fixedly connected to the transmission gear 5; the constraint component is fixedly connected to the other end of the transmission arm, and the constraint component is used to support and connect with the fuse tube 4 of the fuse 1 and to constrain the fuse tube 4 to move along a predetermined path; the output end of the drive mechanism is meshed with the transmission gear 5 and can drive the transmission gear 5 to rotate to a locked position and a released position. When the transmission gear 5 rotates to the locked position, the transmission gear 5 drives the transmission arm and the constraint component to move to a locked state, so as to effectively support the fuse tube 4 and limit its displacement; the drive mechanism responds to the fuse wire blowing signal of the fuse 1 to drive the transmission gear 5 to rotate to the released position, and the drive mechanism releases the transmission gear 5. Driven by the driving force of the moving gear 5, the transmission gear 5 rotates rapidly in the opposite direction under the combined action of the fuse tube 4's own weight and the electric arc thrust, thereby driving the transmission arm and the constraint component to move synchronously. This causes the constraint component to release the constraint on the fuse tube 4, and the fuse tube 4 falls rapidly along a predetermined path to achieve rapid circuit breaking. Through the linkage design of the transmission gear 5, the transmission arm, and the constraint component, the support and constraint of the fuse tube 4 are integrated and controlled. The meshing connection between the drive mechanism and the transmission gear 5 ensures precise switching between the locking and releasing states. Combined with the dual driving force of the fuse tube 4's own weight and the electric arc thrust, the tripping speed is greatly improved, solving the problem of tripping delay in traditional structures. The overall structure has a clear division of labor and clear action logic, significantly improving the operational reliability and fault response efficiency of the fuse 1.

[0023] In a preferred embodiment, the predetermined path is a path in a vertical plane. The constraint component is configured to prevent the fuse tube 4 from swaying in a direction perpendicular to the predetermined path. The predetermined path design in the vertical plane conforms to the natural trajectory of the fuse tube 4 falling under gravity, reducing motion resistance. The constraint component restricts swaying in the direction perpendicular to the path, effectively resisting external interference such as wind and vibration, avoiding accidental displacement or jamming of the fuse tube 4, and ensuring the smoothness and stability of the breaking action.

[0024] In a preferred embodiment, the constraint component is a bushing 2 fitted around the fuse tube 4. The bushing 2 is fixedly connected to the transmission arm and slides with the fuse tube 4. The fitted structure of the bushing 2 increases the contact area with the fuse tube 4, resulting in stronger support stability. The sliding fit design ensures that the fuse tube 4 moves smoothly along the predetermined path and further restricts swaying through the guiding effect of the inner wall of the bushing 2. The structure is simple and compact, eliminating the need for complex limiting mechanisms and reducing production and maintenance costs.

[0025] In a preferred embodiment, the bushing 2 is made of stainless steel. Stainless steel has the characteristics of high strength, corrosion resistance and wear resistance, and can resist the erosion of harsh environments such as outdoor wind, rain and dust, thus extending the service life of the bushing 2. At the same time, its good rigidity can prevent deformation after long-term use, ensure the stability of the constraint effect and improve the overall durability of the device.

[0026] In a preferred embodiment, the transmission arm is a push rod 3. One end of the push rod 3 is fixedly connected to the bushing 2, and the other end is fixedly connected to the transmission gear 5. The push rod 3 has a direct transmission path and low force transmission loss, which can accurately convert the rotation of the transmission gear 5 into the lifting or flipping motion of the bushing 2. The fixed connection at both ends ensures the connection strength, avoids loosening or falling off during operation, improves transmission reliability, and simplifies the assembly process.

[0027] In a preferred embodiment, the drive mechanism includes a reciprocating motor 9, a reciprocating connecting rod 8, a gear connecting rod 7, and a sector gear 6. The center of the sector gear 6 is rotatably connected to the support. The gear connecting rod 7 is hinged to the top of the outer periphery of the sector gear 6, and its other end is hinged to one end of the reciprocating connecting rod 8. The output shaft of the reciprocating motor 9 is fixedly connected to the other end of the reciprocating connecting rod 8 to drive the reciprocating connecting rod 8 to move back and forth in the horizontal direction. The sector gear 6 can mesh with the transmission gear 5. The reciprocating motor 9 drives the sector gear 6 to rotate through the linkage of the reciprocating connecting rod 8 and the gear connecting rod 7. The transmission link is clear and the transmission efficiency is high. The hinged connection ensures that the movement of each component is flexible and there is no risk of jamming. The meshing and cooperation between the sector gear 6 and the transmission gear 5 realizes the precise transmission of power. The automatic switching between the locking and releasing states can be realized through motor control, which improves the ease of operation of the device.

[0028] In a preferred embodiment, the arc length of the sector gear 6 is such that the transmission gear 5 in its free state is rotated to the locking position and remains stably engaged with the sector gear 6. The precise design of the arc length of the sector gear 6 ensures that the two remain stably engaged throughout the entire process of the transmission gear 5 rotating from its free state to the locking position, avoiding locking failure caused by disengagement; at the same time, it ensures the continuity and stability of power transmission, ensuring that the transmission gear 5 can accurately reach the locking position and achieve reliable support for the fuse tube 4.

[0029] In a preferred embodiment, the arc length of the sector gear 6 is half the circumference of the transmission gear 5. Setting the arc length of the sector gear 6 to half the circumference of the transmission gear 5 satisfies the meshing requirement of the transmission gear 5 rotating to the locking position, and can also quickly disengage from the transmission gear 5 in the release state, avoiding obstruction to the reverse rotation of the transmission gear 5. This size design takes into account both locking stability and release flexibility, enabling the device to work efficiently in both states.

[0030] In a preferred embodiment, both the transmission gear 5 and the sector gear 6 are hardened gears. Hardened gears have higher load-bearing capacity and wear resistance, and can withstand the instantaneous impact force during short-circuit faults, avoiding wear or deformation of the gear teeth. At the same time, hardened gears have higher meshing accuracy, better transmission smoothness, reduced energy loss and noise during transmission, extended gear service life, and improved the long-term reliability of the device.

[0031] Example 2 This embodiment also provides a method for using the quick-tripping transmission device of the drop-out fuse as described in any of the above claims, including the following steps: I. Preparation Phase Status check: Confirm that the bracket is firmly fixed, the rotational connection between the transmission gear 5 and the bracket is smooth and without jamming, and the fixed connections between the push rod 3 (transmission arm) and the transmission gear 5 and the bushing 2 (constraint component) at both ends are not loose; the bushing 2 is fitted on the outside of the fuse tube 4, and the sliding fit is flexible without jamming or excessive tightness; the sector gear 6 and the transmission gear 5 are not meshed in the initial state, and the drive mechanism (reciprocating motor 9, connecting rod assembly) is not deformed or loose.

[0032] Electrical connection: Connect the power supply terminal of the reciprocating motor 9 to the power distribution network control circuit, and connect the signal input terminal to the fuse detection device of the fuse 1 to ensure that the motor can accurately receive the fuse signal; check the wiring for tightness and complete the insulation test (insulation resistance ≥10MΩ) to avoid short circuit risk.

[0033] Locking adjustment: Start the reciprocating motor 9 through the external control terminal. The motor drives the reciprocating connecting rod 8 to move horizontally. The gear connecting rod 7 drives the sector gear 6 to rotate until the sector gear 6 and the transmission gear 5 are stably engaged. Continue to drive the transmission gear 5 to rotate to the locking position. At this time, the push rod 3 drives the bushing 2 to move to the locked state. The bushing 2 provides effective support for the fuse tube 4 and restricts lateral sway. Confirm that the locking is in place through the control terminal, and the device enters the standby state.

[0034] II. Normal Operation Phase Real-time monitoring: Relying on the remote monitoring system to monitor the working status of the reciprocating motor 9, ensuring that it maintains driving force when there is no fuse signal, so that the transmission gear 5 remains in the locked position; conduct regular on-site inspections to observe the meshing status of the transmission gear 5 and the sector gear 6, the fit between the bushing 2 and the fuse tube 4, and check that the hardened gear has no wear and the push rod 3 has no bending or deformation, so as to avoid affecting the reliability of the transmission.

[0035] Environmental adaptability: When encountering extreme weather such as strong winds and heavy rain, the monitoring system confirms that the bushing 2 effectively constrains the fuse tube 4, and the fuse tube 4 does not wobble perpendicular to the predetermined path; in high temperature or high humidity environments, focus on checking the heat dissipation of the motor and the lubrication status of the gear meshing, and add high temperature grease if necessary to ensure the normal operation of the components.

[0036] III. Fault Tripping Stage Signal triggering: When a short circuit or overcurrent fault occurs in the power distribution network, the fuse in fuse 1 blows. The fuse detection device immediately sends a signal to the reciprocating motor 9. After receiving the signal, the motor drives the sector gear 6 to rotate, which in turn drives the transmission gear 5 to switch from the locked position to the released position.

[0037] Drive force release: After the transmission gear 5 reaches the release position, the reciprocating motor 9 stops working and releases the driving force on the transmission gear 5. At this time, the sector gear 6 disengages from the transmission gear 5 and no longer forms a mechanical constraint.

[0038] Rapid disconnection: Under the combined action of the weight of the fuse tube 4 and the thrust of the electric arc, the transmission gear 5 rotates rapidly in the opposite direction, driving the push rod 3 and the bushing 2 to move synchronously. The bushing 2 releases its support and constraint on the fuse tube 4. The fuse tube 4 falls rapidly along a predetermined path in the vertical plane, realizing the rapid isolation of the fault circuit. The entire tripping disconnection process takes ≤0.3s.

[0039] IV. Reset and Maintenance Phase Troubleshooting: After confirming that the faulty circuit has been safely isolated, the maintenance personnel replace the blown fuse tube with an insulated operating rod, ensuring that the specifications of the new fuse tube match the requirements of the power distribution network and that it slides smoothly after being fitted into bushing 2.

[0040] Mechanism reset: The reciprocating motor 9 is started to reverse through the external control terminal, which drives the reciprocating connecting rod 8, gear connecting rod 7 and sector gear 6 to move in the opposite direction. The sector gear 6 re-meets with the transmission gear 5 and drives it to rotate. Then, the push rod 3 drives the bushing 2 to rise until the bushing 2 once again provides effective support for the fuse tube, and the transmission gear 5 returns to the locked position.

[0041] Operational confirmation: After the reset is completed, check whether the device lock-up status is stable, whether the meshing of transmission gear 5 and sector gear 6 is reliable, and whether bushing 2 effectively restricts the shaking of fuse tube 4 through the control terminal; simulate the fuse signal to perform 1-2 tripping tests, and after confirming that the action is normal, the device restores normal power supply function.

[0042] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A quick-tripping transmission device for a drop-out fuse, characterized in that: include: support; A transmission gear (5) is rotatably mounted on the bracket; A transmission arm, one end of which is fixedly connected to the transmission gear (5); A constraint component is fixedly connected to the other end of the transmission arm. The constraint component is used to support and connect with the fuse tube (4) of the fuse (1) and can constrain the fuse tube (4) to move along a predetermined path. as well as The drive mechanism has its output end meshing with the transmission gear (5) and can drive the transmission gear (5) to rotate to the locked position and the released position. When the transmission gear (5) rotates to the locked position, the transmission gear (5) drives the transmission arm and the constraint component to move to the locked state, so as to effectively support the fuse tube (4) and limit its displacement. The drive mechanism responds to the fuse wire melting signal of the fuse (1) and drives the transmission gear (5) to rotate to the released position. The drive mechanism releases the driving force on the transmission gear (5). Under the combined action of the weight of the fuse tube (4) and the electric arc thrust, the transmission gear (5) rotates rapidly in the opposite direction, thereby driving the transmission arm and the constraint component to move synchronously, so that the constraint component releases the constraint on the fuse tube (4), and the fuse tube (4) falls rapidly along a predetermined path to realize the rapid disconnection of the circuit.

2. The quick-tripping transmission device for a drop-out fuse according to claim 1, characterized in that: The predetermined path is a path in a vertical plane, and the constraint component is configured to prevent the fuse tube (4) from swaying in a direction perpendicular to the predetermined path.

3. The quick-tripping transmission device for a drop-out fuse according to claim 2, characterized in that: The constraint component is a bushing (2) fitted outside the fuse tube (4). The bushing (2) is fixedly connected to the transmission arm and slides with the fuse tube (4).

4. The quick-tripping transmission device for a drop-out fuse according to claim 3, characterized in that: The bushing (2) is made of stainless steel.

5. The quick-tripping transmission device for a drop-out fuse according to claim 4, characterized in that: The transmission arm is a push rod (3), one end of which is fixedly connected to the bushing (2), and the other end is fixedly connected to the transmission gear (5).

6. The quick-tripping transmission device for a drop-out fuse according to claim 1, characterized in that: The drive mechanism includes a reciprocating motor (9), a reciprocating connecting rod (8), a gear connecting rod (7), and a sector gear (6). The center of the sector gear (6) is rotatably connected to the bracket. The gear connecting rod (7) is hinged to the top of the outer periphery of the sector gear (6), and the other end is hinged to one end of the reciprocating connecting rod (8). The output shaft of the reciprocating motor (9) is fixedly connected to the other end of the reciprocating connecting rod (8) to drive the reciprocating connecting rod (8) to move back and forth in the horizontal direction. The sector gear (6) can mesh with the transmission gear (5).

7. The quick-tripping transmission device for a drop-out fuse according to claim 6, characterized in that: The arc length of the sector gear (6) is such that when the transmission gear (5) in the free state is rotated to the locked position, it maintains stable meshing with the sector gear (6).

8. The quick-tripping transmission device for a drop-out fuse according to claim 7, characterized in that: The arc length of the sector gear (6) is half the circumference of the transmission gear (5).

9. The quick-tripping transmission device for a drop-out fuse according to claim 8, characterized in that: Both the transmission gear (5) and the sector gear (6) are hardened gears.

10. A method of using a fast tripping transmission device for a drop-out fuse according to any one of claims 1 to 9, characterized in that, Includes the following steps: In normal flow conditions, the drive mechanism drives the transmission gear (5) and keeps it in the locked position, so that the constraint component provides effective support and constraint for the fuse tube (4); In response to the trigger signal indicating that the fuse of the fuse (1) has blown, the output end of the drive mechanism is controlled to drive the transmission gear (5) to rotate to the release position and release the lock on the rotation of the transmission gear (5); After the lock is released, the transmission gear (5) rotates rapidly in the opposite direction under the combined action of the weight of the fuse tube (4) and the electric arc thrust, thereby driving the constraint component to move to release the constraint on the fuse tube (4) and causing the fuse tube (4) to fall rapidly along the predetermined path.

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