A three-phase synchronous drop-out fuse switch

Abstract

The application discloses a three-phase synchronous drop-out type fuse switch, which comprises a plug pipe corresponding to three phases, three branch-on / off supports fixedly connected with the three plug pipes respectively and a fuse pipe in plug-in cooperation with the plug pipe, characterized in that the top of the three branch-on / off supports is connected with a flexible replacement device. In the application, a set of flexible replacement devices is loaded on the three branch-on / off supports, the flexible replacement devices are provided with a belt type expander, the belt of the belt type expander is provided with a pawl and a control assembly, the control assembly plays a role in controlling the belt to be opened, the pawl can grab the fuse pipe when the belt is opened, the belt operation can control the fuse pipe to enter or exit the plug pipe, and the belt type expander is rotatably arranged, so that the fuse pipes at three different positions can be moved and replaced, the replacement operation is not needed to be manually performed by climbing, and the convenience and safety of the replacement of the fuse pipe of the fuse switch are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of fuse switch technology, and more particularly to a three-phase synchronous drop-out fuse switch. Background Technology

[0002] Fuses are essential protective devices for high-voltage transmission lines. When a short circuit or overload occurs in the transmission line, they can promptly disconnect the faulty line to prevent damage to the line and electrical equipment.

[0003] Patent CN109950109B discloses a 10kV three-phase synchronous drop-out fuse switch, comprising three sets of fuse mechanisms and an insulating connecting rod connecting the three sets of fuse mechanisms. Each fuse mechanism includes a porcelain insulator, mounting components, inlet terminals, outlet terminals, upper stationary contact assembly, lower stationary contact assembly, upper moving contact assembly, lower moving contact assembly, fuse tube, fuse, opening / closing bracket, opening / closing handle, and arc extinguishing tube. Its key feature is that by rotating the fixing foot of the lower moving contact assembly's housing to a horizontal or vertical position, it drives the lower moving contact assembly, fuse tube, and upper moving contact assembly, which are integrated with it, to move upward or downward together. This achieves the pressing or disconnection of the upper moving contact assembly with the upper stationary contact assembly, and, under the linkage of the insulating connecting rod, realizes the closing or opening operation of the fuse mechanism. The advantages of this invention are: simple structure, convenient operation, more stable contact between the upper and lower moving and stationary contacts, and effective avoidance of arc short circuit problems.

[0004] However, the above-mentioned existing technology still has shortcomings in use: after the fuse in the fuse tube blows, the fuse tube needs to be replaced. The fuse tube socket on the lower contact assembly is equipped with a tube that can be inserted into the fuse tube. In order to improve the tightness of the connection between the fuse tube and the tube, a structure with a shrinkage diameter is installed on the tube. Usually, the replacement of the fuse tube is done manually at height with the power on, which increases the difficulty of disassembling and assembling the fuse tube.

[0005] Therefore, this invention proposes a three-phase synchronous drop-out fuse switch, aiming to optimize and improve upon the deficiencies of the existing technology. Summary of the Invention

[0006] The purpose of this invention is to provide a three-phase synchronous drop-out fuse switch in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A three-phase synchronous drop-out fuse switch includes three corresponding tubes, three opening and closing brackets fixedly connected to the three tubes respectively, and fuse tubes that engage with the tubes. The switch is characterized in that a flexible replacement device is connected to the top of each of the three opening and closing brackets. This flexible replacement device has a traveling slide and a tension belt changer located above the traveling slide. The traveling slide passes one side of each of the three tubes during travel. The tension belt changer and the traveling slide are rotatably connected, with their rotation axis parallel to the tubes. The belt on the tension belt changer has claws located on both sides of the rotation axis of the tension belt changer and the traveling slide. When the belt rotates, it drives the claws to move. The claws slide in contact with the belt, and the sliding direction is perpendicular to the adjacent peripheral wall of the belt. The tension belt changer contains a control assembly for controlling the belt's expansion. A trigger unlocking mechanism is located on one side of each tube, and a telescopic push rod for controlling the action of the trigger unlocking mechanism is located on one side of the traveling slide.

[0009] As a further description of the above technical solution:

[0010] The tensioning belt changer is equipped with a grooved plate, in which a lower positioning pulley and an upper tensioning pulley are arranged vertically. The lower positioning pulley and the upper tensioning pulley are connected by a belt. A transmission shaft that is rotatably connected to the bottom of the grooved plate is fixedly connected to the traveling slide.

[0011] As a further description of the above technical solution:

[0012] The grooved plate has sliders that slide up and down on both sides. A guide shaft is fixedly connected to one side of the slider. A slide plate is sleeved on the guide shaft. A support rod is fixedly connected to the back of the claw, with one end of the support rod being fixedly connected to the front side of the slide plate. The support rod is fixedly connected to the adjacent side of the belt.

[0013] As a further description of the above technical solution:

[0014] The control assembly includes a rotating shaft, a transmission plate, and a telescopic drive rod. A rotating shaft is provided on one side of the slotted plate, located on the upper and lower sides of the chuck. The transmission plate is slidably connected to one side of the slotted plate and meshes with the rotating shaft. One end of the rotating shaft is rotatably connected to a support wheel that abuts against the inner side of the belt via an arm. The telescopic drive rod is fixedly installed on one side of the slotted plate, and its output shaft is fixedly connected to one end of the transmission plate.

[0015] As a further description of the above technical solution:

[0016] The claw is C-shaped, and the outer peripheral wall of the fuse tube has an upper limit annular groove that engages with the claw.

[0017] As a further description of the above technical solution:

[0018] The trigger unlocking mechanism includes a connecting rod, a pin, and an elastic support. The outer peripheral wall of the insertion tube is fixedly connected to a support that is rotatably connected to one side of the connecting rod. The top of the connecting rod and one end of the pin are movably connected. The pin passes through the outer peripheral wall of the insertion tube and the two are in sliding engagement. The elastic support is located between the insertion tube and the connecting rod and below the support. The outer peripheral wall of the fuse tube has a lower limit annular groove near the bottom.

[0019] As a further description of the above technical solution:

[0020] One side of the walking slide is connected to a tray via a bracket. The top of the tray is fixedly connected to three adapter slots on the same arc line that are compatible with the fuse tube.

[0021] As a further description of the above technical solution:

[0022] The flexible replacement device is equipped with a positioning plate that is fixedly connected to three opening and closing brackets. The traveling slide is slidably mounted on the top of the positioning plate, and the positioning plate is equipped with a transmission screw that is screwed through and engaged with the traveling slide.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. In this invention, a flexible replacement device is installed on three opening and closing brackets. The flexible replacement device is equipped with a tension belt type replacement device. The belt of the tension belt type replacement device is equipped with claws and a control assembly. The control assembly controls the belt to open. When the belt is opened, the claws can grab the fuse tube. The belt rotation can control the fuse tube to enter and exit the insertion tube. The tension belt type replacement device is rotatable, thereby realizing the movement and replacement of fuse tubes in three different positions. This method eliminates the need for manual climbing to perform replacement operations, greatly improving the convenience and safety of replacing fuse tubes in this fuse switch.

[0025] 2. In this invention, the gripper and the belt are connected. When the gripper grabs the fuse tube and the insertion tube for insertion, if there is insertion stress at the bottom of the fuse tube and the insertion tube, the belt will adapt to the back and forth movement, thereby greatly reducing the resistance of the fuse tube and the insertion tube. This not only improves the reliability of fuse tube replacement, but also makes the fuse tube replacement operation smoother and more efficient.

[0026] 3. In this invention, a trigger unlocking mechanism is provided on the insertion tube, and a telescopic push rod is provided on one side of the traveling slide. Then, a lower limit ring groove is opened on the fuse tube. Thus, when it is necessary to disassemble or assemble the fuse tube, the trigger unlocking mechanism is first controlled to eliminate the limiting structure of the insertion tube, so that the fuse tube can enter and exit the insertion tube without obstruction. When the control of the trigger unlocking mechanism is released, the fuse tube will be limited inside the insertion tube. This setting has the advantage of improving the reliability of the connection between the fuse tube and the insertion tube. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the insertion tube, fuse tube and flexible replacement device of a three-phase synchronous drop-out fuse switch proposed in this invention.

[0028] Figure 2 This is a schematic diagram of the structure of the traveling slide, tension belt changer and control combination of a three-phase synchronous drop-out fuse switch proposed in this invention.

[0029] Figure 3 for Figure 2 A magnified diagram of the central "a";

[0030] Figure 4 for Figure 3 A diagram of the back;

[0031] Figure 5 This is a schematic diagram of the triggering and unlocking mechanism of a three-phase synchronous drop-out fuse switch proposed in this invention;

[0032] Figure 6 for Figure 5 A schematic diagram showing the unfolding of the fuse tube and insertion tube after the explosion.

[0033] Legend:

[0034] 1. Insertion tube; 11. Support; 2. Opening / closing bracket; 3. Fuse tube; 31. Upper limit ring groove; 32. Lower limit ring groove; 4. Flexible replacement device; 41. Traveling slide; 411. Tray; 412. Transfer groove; 42. Tensioning belt changer; 421. Belt; 422. Groove plate; 4221. Drive shaft; 423. Lower positioning pulley; 424. Upper tensioning pulley; 425. Slider; 4251. Guide shaft; 42511. Slide plate; 43. Claw; 431. Support rod; 44. Control assembly; 441. Rotating shaft; 4411. Arm; 4412. Support wheel; 442. Transmission plate; 443. Telescopic drive rod; 45. Positioning plate; 451. Transmission screw; 5. Trigger unlocking mechanism; 51. Connecting rod; 53. Pin; 54. Elastic support; 6. Telescopic push rod. Detailed Implementation

[0035] 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.

[0036] Example 1

[0037] Please see Figure 1-6 A three-phase synchronous drop-out fuse switch includes a tube 1 corresponding to each of the three phases, three opening and closing brackets 2 fixedly connected to the three tubes 1 respectively, and a fuse tube 3 that is inserted into and cooperates with the tubes 1. The tubes 1 are inserted in a gap-fitting manner. Conductive copper sheets are installed inside the tubes 1 for electrical connection with the fuse tube 3. A flexible replacement device 4 is connected to the top of the three opening and closing brackets 2. The flexible replacement device 4 is provided with a traveling slide 41 and a tension belt type changer 42 located above the traveling slide 41. The tension belt type changer 42 is provided with a groove plate 422. The groove plate 422 is provided with a lower positioning pulley 423 and an upper tension pulley 424 distributed vertically. The lower positioning pulley 423 and the upper tension pulley 424 are connected by a belt 421. The belt 421 is a synchronous belt. A servo motor for controlling the rotation of the lower positioning pulley 423 is fixedly installed on the outside of the groove plate 422. When the walking slide 41 moves, it will pass one side of the three insertion tubes 1. The tension belt changer 42 is rotatably connected to the walking slide 41 and the rotation axis is parallel to the insertion tube 1. In specific implementation, it is preferred that the bottom of the groove plate 422 is fixedly connected to the drive shaft 4221 which is rotatably connected to the walking slide 41. In use, a control motor group for controlling the rotation of the drive shaft 4221 is installed at the bottom of the walking slide 41. The belt 421 of the tension belt changer 42 is equipped with claws 43 located on both sides of the rotation axis of the tension belt changer 42 and the traveling slide 41. When the belt 421 is running, it can drive the claws 43 to move. The claws 43 and the belt 421 are in sliding engagement and the sliding direction is perpendicular to the adjacent peripheral wall on the belt 421. The movement and rotation function of the tension belt changer 42 can drive the claws to approach the fuse tubes 3 inserted on each insertion tube 1. The function of the tension belt changer 42 is to replace any opposite damaged fuse tube 3. The operation of the belt 421 can drive the claws 43 to perform the insertion action.

[0038] The belt changer 42 is equipped with a control assembly 44 for controlling the opening of the belt 421. When the belt 421 is opened, it will drive the claw 43 to approach the insertion tube 1. The opening range of the belt 421 can control the claw 43 to use its elastic properties to lock onto the outside of the fuse tube 3. Conversely, it can control the claw 43 to separate from the fuse tube 3. In specific implementation, it is preferred that the claw 43 is C-shaped, and the outer peripheral wall of the fuse tube 3 is provided with an upper limit ring groove 31 that engages with the claw 43. After the claw 43 is locked in the upper limit ring groove 31, its up and down movement can reliably drive the fuse tube 3 to move up and down. It should be noted that due to the installation error of each insertion tube 1, the distance between each insertion tube 1 and the traveling slide 41 at the replacement position on one side of the insertion tube 1 is different. At this time, the belt 421 uses its own flexible characteristics to allow the fuse tube 3 to enter and exit the insertion tube 1 with low stress. This setting not only greatly reduces the resistance of replacing the fuse tube 3, making the operation more reliable, but also will not damage the fuse tube 3.

[0039] The two sides of the groove plate 422 are slidably connected to sliders 425. A guide shaft 4251 is fixedly connected to one side of the slider 425. A slide plate 42511 is sleeved on the guide shaft 4251. A guide sleeve that slides and engages with the guide shaft 4251 is fixedly installed on the slide plate 42511. A support rod 431 is fixedly connected to the back of the claw 43. One end of the support rod 431 is fixedly connected to the front side of the slide plate 42511. The support rod 431 is fixedly connected to the adjacent side of the belt 421. This arrangement ensures that when the belt 421 is running, the claw 43 will keep its opening facing the same direction. This allows the fused tube 3 it grips to move up and down as a whole while keeping it aligned with or parallel to the insertion tube 1.

[0040] Furthermore, the control assembly 44 includes a rotating shaft 441, a transmission plate 442, and a telescopic drive rod 443. A rotating shaft 441 is located on one side of the channel plate 422, positioned above and below the pawl 43. The transmission plate 442 is slidably connected to one side of the channel plate 422 and meshes with the rotating shaft 441. In a specific implementation, a transmission gear can be fixedly mounted on the rotating shaft 441, and teeth meshing with the transmission gear can be provided on the transmission plate 442. One end of the rotating shaft 441 is rotatably connected via an arm 4411 to a support wheel 4 that abuts against the inner side of the belt 421. 412, the telescopic drive rod 443 is fixedly installed on one side of the groove plate 422 and its output shaft is fixedly connected to one end of the transmission plate 442. The telescopic drive rod 443 is an electric push rod. When the transmission plate 442 moves up and down, it can drive the rotating shaft 441 to rotate, which in turn can drive the two arms 4411 distributed on the same side to move in opposite directions or in the opposite direction. At the same time, it can make the belt 421 symmetrically spread open, and the upper tension pulley 424 will move down to compensate. At this time, controlling the belt 421 to run can drive the claw 43 to move laterally to grab or release the fuse tube 3.

[0041] A trigger unlocking mechanism 5 is provided on one side of the insertion tube 1. The function of the trigger unlocking mechanism 5 is to limit the fuse tube 3 inserted into the insertion tube 1 to prevent it from falling out. At the same time, it has the function of quick unlocking to facilitate the removal of the fuse tube 3. A telescopic push rod 6 is provided on one side of the traveling slide 41 to control the action of the trigger unlocking mechanism 5.

[0042] Specifically, the trigger unlocking mechanism 5 includes a connecting rod 51, a pin 53, and an elastic support 54. A support 11, which is rotatably connected to one side of the connecting rod 51, is fixedly connected to the outer peripheral wall of the insertion tube 1. The top of the connecting rod 51 is movably connected to one end of the pin 53, which passes through the outer peripheral wall of the insertion tube 1 and the two are in sliding engagement. The elastic support 54 is located between the insertion tube 1 and the connecting rod 51 and below the support 11. The elastic support 54 can be a spring, which applies an elastic thrust to the connecting rod 51. The outer peripheral wall of the fuse tube 3 has an opening... Near the bottom of the lower limit annular groove 32, the push rod 51 of the elastic support 54 swings outward. At this time, the other end of the pin 53 will enter the insertion tube 1. When it enters the lower limit annular groove 32, the fuse tube 3 will be limited. When the connecting rod 51 is pressed inward, the elastic support 54 is compressed, and the pin 53 will disengage from the lower limit annular groove 32. At this time, the fuse tube 3 can be easily pulled out. The telescopic push rod 6 can also be an electric push rod. When in use, its output shaft is opposite to the free end of the connecting rod 51, and it provides driving force to the inward swing of the connecting rod 51.

[0043] In this embodiment, a tray 411 is connected to one side of the walking slide 41 via a bracket. The top of the tray 411 is fixedly connected to three transfer slots 412 on the same arc line that are inserted into the fuse tube 3. The transfer slots 412 serve to transfer the fuse tube 3. When one of the fuse tubes 3 inserted into the tube 1 needs to be replaced, only one fuse tube 3 needs to be placed in one of the transfer slots 412. Then, the flexible replacement device 4 is controlled to take the fuse tube 3 in the transfer slot 412 in the manner described above, by controlling one of the claws 43 to move. Then, the slot plate 422 is controlled to rotate, and another claw 43 is used to grab and remove the fused fuse tube 3. Then, the slot plate 422 is controlled to rotate again to insert the good fuse tube 3 into the tube 1.

[0044] In this embodiment, the flexible replacement device 4 is provided with a positioning plate 45 that is fixedly connected to three opening and closing brackets 2. The traveling slide 41 is slidably disposed on the top of the positioning plate 45. The positioning plate 45 is provided with a transmission screw 451 that is screwed through and engaged with the traveling slide 41. In use, a control motor can be installed at one end of the positioning plate 45. The output shaft of the control motor is fixedly connected to one end of the transmission screw 451, thereby facilitating the movement of the traveling slide 41 to a fixed position on any side of the insertion tube 1 by means of the transmission screw 451.

[0045] It should be noted that the addition of the flexible replacement device 4 increases the size of the three opening and closing brackets 2, which may cause the opening and closing brackets 2 to be accidentally triggered when under load. In this case, a parallel spring can be connected between the base on the lower stationary contact and the insertion tube 1. The function of this balance spring is to balance the weight of the flexible replacement device 4 and reduce the load on the opening and closing brackets 2. By selecting balance springs with different elastic forces, it can be ensured that the opening and closing brackets 2 can swing normally.

[0046] Working principle: When one of the fuse tubes 3 needs to be replaced, the drive shaft 4221 is rotated so that one of the claws 43 faces the intact fuse tube 3 on one of the transfer grooves 412. Then, the drive plate 442 is slid, and the arm 4411 swings to open the belt 421. The claw 43 is engaged in the upper limit ring groove 31. Then, the belt 421 is rotated to drive the claw 43 to move upward. When the intact fuse tube 3 is pulled out from the transfer groove 412, the traveling slide 41 is moved to the side of the insertion tube 1 corresponding to the fuse tube 3 to be replaced. Then, the connecting rod 51 is swung outward, and another empty claw 43 is used to grab the fused fuse tube 3 and pull it out. The groove plate 422 is rotated, and finally the intact fuse tube 3 is inserted into the corresponding insertion tube 1. When the traveling slide 41 is retracted, the replacement of the fuse tube 3 is completed.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A three-phase synchronous drop-out fuse switch, comprising inserts (1) corresponding to each of the three phases, three opening and closing brackets (2) fixedly connected to the three inserts (1) respectively, and fuse tubes (3) inserted into and cooperating with the inserts (1), characterized in that, The top of the three opening and closing brackets (2) is connected to a flexible replacement device (4). The flexible replacement device (4) is equipped with a traveling slide (41) and a tension belt type changer (42) located above the traveling slide (41). When the traveling slide (41) moves, it will pass one side of the three insertion tubes (1). The tension belt type changer (42) and the traveling slide (41) are rotatably connected and the rotation axis is parallel to the insertion tube (1). The belt (421) on the tension belt type changer (42) is equipped with claws (43) located on both sides of the rotation axis of the tension belt type changer (42) and the traveling slide (41). When the belt (421) is running, it can drive The chuck (43) moves, and the chuck (43) slides with the belt (421) and the sliding direction is perpendicular to the adjacent peripheral wall on the belt (421). The tension belt changer (42) is provided with a control assembly (44) for controlling the opening of the belt (421). A trigger unlocking mechanism (5) is provided on one side of the insertion tube (1). A telescopic push rod (6) for controlling the action of the trigger unlocking mechanism (5) is provided on one side of the traveling slide (41). A grooved plate (422) is provided on the tension belt changer (42). The grooved plate (422) is provided with a lower positioning pulley (423) and an upper tensioning pulley (424) distributed vertically. The lower positioning pulley (423) and the upper tensioning pulley (424) are connected by a belt (421). The bottom of the grooved plate (422) is fixedly connected to a transmission shaft (4221) that is rotatably connected to the traveling slide (41). Slider blocks (425) are slidably connected to both sides of the grooved plate (422). A guide shaft (4251) is fixedly connected to one side of the slider (425). A slide plate (42511) is sleeved on the guide shaft (4251). A support rod (431) is fixedly connected to the back of the claw (43) at one end and fixedly connected to the front side of the slide plate (42511). The support rod (431) and the belt (421) are fixedly connected to each other on adjacent sides. The control assembly (44) includes a rotating shaft (441), a transmission plate (442), and a telescopic drive rod (443). The rotating shaft (441) is located on the upper and lower sides of the pawl (43) on one side of the slotted plate (422). The transmission plate (442) is slidably connected to one side of the slotted plate (422) and meshes with the rotating shaft (441). One end of the rotating shaft (441) is rotatably connected to a support wheel (4412) that abuts against the inner side of the belt (421) through an arm (4411). The telescopic drive rod (443) is fixedly installed on one side of the slotted plate (422), and its output shaft is fixedly connected to one end of the transmission plate (442).

2. A three-phase synchronous drop-out fuse switch according to claim 1, characterized in that, The claw (43) is C-shaped, and the outer peripheral wall of the fuse tube (3) is provided with an upper limit annular groove (31) that engages with the claw (43).

3. A three-phase synchronous drop-out fuse switch according to claim 1, characterized in that, The trigger unlocking mechanism (5) includes a connecting rod (51), a pin (53) and an elastic support (54). The outer peripheral wall of the insertion tube (1) is fixedly connected to a support (11) that is rotatably connected to one side of the connecting rod (51). The top of the connecting rod (51) is movably connected to one end of the pin (53). The pin (53) is set through the outer peripheral wall of the insertion tube (1) and the two are slidably engaged. The elastic support (54) is located between the insertion tube (1) and the connecting rod (51) and is located below the support (11). The outer peripheral wall of the fuse tube (3) is provided with a lower limit annular groove (32) near the bottom.

4. A three-phase synchronous drop-out fuse switch according to claim 1, characterized in that, The walking slide (41) has a tray (411) connected to one side by a bracket. The top of the tray (411) is fixedly connected to three adapter slots (412) on the same arc line and which are inserted into the fuse tube (3).

5. A three-phase synchronous drop-out fuse switch according to claim 1, characterized in that, The flexible replacement device (4) is provided with a positioning plate (45) that is fixedly connected to three opening and closing brackets (2). The traveling slide (41) is slidably disposed on the top of the positioning plate (45). The positioning plate (45) is provided with a transmission screw (451) that is screwed through and engaged with the traveling slide (41).

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