Line conversion arc extinguishing complete equipment for on-load tap changer

Abstract

The invention provides line conversion arc extinguishing complete equipment for an on-load tap changer, which is used for solving the problem that an on-load tap changer in the prior art generates an electric arc in a switching process. The line switching arc extinguishing complete device comprises an upper shell and a lower shell, a driving module is fixed on the upper shell, a plurality of mounting grooves are formed in the lower shell, the mounting grooves are fixedly connected with a line arc extinguishing switching system, the line arc extinguishing switching system comprises a normally-open vacuum bubble and a normally-closed vacuum bubble, a transmission frame is arranged between the upper shell and the lower shell in a sliding mode, and the transmission frame is connected with the normally-open vacuum bubble. The transmission frame is driven by a driving module, a plurality of clamping plates are arranged on the transmission frame, and the clamping plates are clamped with the movable ends of the normally-open vacuum bubbles and the normally-closed vacuum bubbles in a one-to-one correspondence manner. When the circuit needs to be switched, the switching fracture is located in the vacuum tube, no electric arc is generated, pollution to surrounding media and damage to fracture contacts are completely eradicated, and therefore the service life of equipment can be effectively prolonged.

Description

Technical Field

[0001] The invention relates to the field of on-load voltage regulating switches, in particular to a complete set of line conversion arc extinguishing devices for on-load voltage regulating switches. Background Art

[0002] In the power system, the on-load tap changer is an important part of the automatic voltage regulation of the transformer. It is responsible for automatically adjusting the voltage according to the back-end load conditions without power outages to ensure the stable operation of the power grid. However, the traditional on-load tap changer is often accompanied by the generation of arcs during the switching process. This arc pollutes the insulating medium inside the system and damages the contacts, reducing the reliability and life of the equipment, and may lead to an increase in maintenance frequency, thereby increasing operating costs. Summary of the invention

[0003] The present invention provides a complete set of arc extinguishing devices for line conversion of on-load voltage regulators, which solves the problem in the prior art that arcs are generated in the on-load voltage regulator during switching, so that the insulating medium will not be contaminated during the switching process.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A complete set of line conversion arc extinguishing devices for on-load voltage regulating switches comprises an upper shell and a lower shell, wherein a driving module is fixed on the upper shell, and a plurality of mounting slots are provided on the lower shell, wherein a line arc extinguishing switching system is fixedly connected to the mounting slots, and the line arc extinguishing switching system comprises a normally open vacuum bubble and a normally closed vacuum bubble, and a transmission frame is slidably provided between the upper shell and the lower shell, wherein the transmission frame is driven by the driving module, and a plurality of clamping plates are provided on the transmission frame, and the clamping plates are clamped with the movable ends of the normally open vacuum bubble and the normally closed vacuum bubble in a one-to-one correspondence.

[0006] Furthermore, the driving module includes a driving shell, a fixed iron core is arranged in the driving shell, a guide shaft is fixed on the end face of the fixed iron core, a moving iron core slides on the guide shaft, the end of the moving iron core away from the fixed iron core penetrates the driving shell, the end of the moving iron core placed outside the driving shell drives the transmission frame through the transmission shaft, coils are arranged around the fixed iron core and the moving iron core in the driving shell, a plurality of limit seats are fixed on the lower shell, a plurality of support plates are arranged on the side wall of the transmission reset system, the support plates and the limit seats are counteracted by reset springs, and the elastic force direction of the reset springs is opposite to the driving direction of the driving module. By controlling the power on and off of the coil by electromagnetic drive, the movement and reset of the transmission frame can be conveniently controlled, and it has the advantages of fast response speed, large driving force and precise control, ensuring the rapidity and accuracy of line switching.

[0007] Furthermore, the line arc extinguishing switching system is composed of three groups of adjacent normally open vacuum bubbles and normally closed vacuum bubbles, the mounting groove is a vertical T-shaped groove, the fixed ends of the normally open vacuum bubbles and the normally closed vacuum bubbles are fixedly connected to a fixed plate through a fixed shaft, the movable ends of the normally open vacuum bubbles and the normally closed vacuum bubbles are fixedly connected to a movable plate through a sliding rod, the fixed plates are placed in the T-shaped groove, the movable plates of the normally open vacuum bubbles and the normally closed vacuum bubbles are close to each other, and the movable plates are connected by a connecting spring, and the one group of line arc extinguishing switching systems is correspondingly provided with two clamping plates, the adjacent movable plates are placed between the two clamping plates, and the bottom end of the clamping plate is against the side wall of the sliding rod through an arc-shaped depression. When the clamping plate moves quickly, the connecting spring can absorb part of the impact force to prevent the movable end of the vacuum bubble from vibrating during the movement, thereby ensuring the stability of the arc extinguishing system and protecting the safety of its supporting system. .

[0008] Furthermore, a sliding hole is provided on the upper shell, a transmission plate is fixed on the transmission frame, a transmission hole is provided on the transmission plate, the telescopic end of the drive module is fixedly connected to a vertical transmission shaft, and the transmission shaft passes through the sliding hole and is placed in the transmission hole. The precise connection between the transmission shaft and the transmission hole helps to improve the overall reliability of the system, ensure the stable movement of the transmission frame, and reduce failures caused by inaccurate docking.

[0009] Furthermore, the limit seat and the support plate are provided with corresponding limit shafts, and the two ends of the reset spring are sleeved on the limit shafts. The limit shaft provides precise guidance and limit functions for the reset spring, ensuring that the reset spring always maintains the correct direction and position during operation, avoiding the problem of tilting, deflection or even falling off caused by vibration, impact or long-term use, and enhancing the structural stability of the entire transmission reset system.

[0010] Furthermore, the top surface of the lower shell is provided with a plurality of arcuate surfaces, which are against the bottom surface of the transmission frame. When the transmission frame is subjected to external force or driving force, the arcuate surfaces can provide more uniform support and dispersed force, avoid local stress concentration, and reduce the risk of deformation and damage of the transmission frame.

[0011] The technical solution can produce beneficial effects.

[0012] When the circuit in the present invention needs to be switched, the switching break is inside the vacuum tube, and the external contacts do not generate arcs, thereby preventing pollution of the surrounding medium and damage to the break contacts, thereby effectively extending the service life of the equipment. The elastic force of the reset spring automatically pushes the transmission frame back to the initial position, without the need for an additional reset mechanism or power source, thereby simplifying the system structure and improving the reliability, stability and response speed of the system. Rapid response can be achieved through the fixed iron core, the moving iron core and the coil, so that the line arc extinguishing switching system can quickly switch the conduction line when needed, reducing possible power loss or equipment damage, and the separate design of the drive module and the line arc extinguishing switching system can facilitate modular production and maintenance and replacement of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the explosion three-dimensional structure of the present invention;

[0016] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the driving module of the present invention;

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the transmission frame of the present invention;

[0018] Figure 5 It is a schematic diagram of the three-dimensional structure of the arc extinguishing switching system for a single group of lines of the present invention;

[0019] Figure 6 for Figure 2 A local enlarged schematic diagram of point A in the middle.

[0020] Wherein: 1. upper shell, 2. lower shell, 3. drive module, 4. normally open vacuum bubble, 5. normally closed vacuum bubble, 6. transmission frame, 7. clamping plate, 8. fixed iron core, 9. guide shaft, 10. moving iron core, 11. transmission shaft, 12. coil, 13. limit seat, 14. support plate, 15. reset spring, 16. T-slot, 17. fixed shaft, 18. fixed plate, 19. sliding rod, 20. movable plate, 21. arc-shaped depression, 22. sliding hole, 23. transmission plate, 24. transmission hole, 25. limit shaft, 26. arc-shaped surface, 27. connecting spring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of this embodiment, it is necessary to understand that the terms "center, longitudinal, lateral, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0023] like Figure 1-2 As shown in Figures 5 and 6, an embodiment of the present invention provides a complete set of line conversion arc extinguishing devices for on-load voltage regulating switches, including an upper shell 1 and a lower shell 2, a driving module 3 is fixed on the upper shell 1, a plurality of mounting slots are provided on the lower shell 2, a line arc extinguishing switching system is fixedly connected to the mounting slots, the line arc extinguishing switching system includes a normally open vacuum bubble 4 and a normally closed vacuum bubble 5, a transmission frame 6 is slid between the upper shell 1 and the lower shell 2, the transmission frame 6 is driven by the driving module 3, a plurality of clamping plates 7 are provided on the transmission frame 6, and the clamping plates 7 are clamped with the movable ends of the normally open vacuum bubble 4 and the normally closed vacuum bubble 5 in a one-to-one correspondence. The normally open vacuum bubble 4 and the normally closed vacuum bubble 5 are both prior art.

[0024] When it is necessary to switch the conductive line, the drive module 3 provides power to the transmission frame 6, so that the transmission frame 6 moves between the upper shell 1 and the lower shell 2, and the transmission frame 6 drives the movable ends of the normally open vacuum bubble 4 and the normally closed vacuum bubble 5 to move through the clamping plate 7. When the drive module 3 is closed, the normally closed vacuum bubble 5 is disconnected and the normally open vacuum bubble 4 is turned on. When the drive module 3 is opened, the normally closed vacuum bubble 5 is turned on and the normally open vacuum bubble 4 is disconnected, so as to achieve the purpose of switching the conductive line. When it is necessary to restore the conductive line, the drive module 3 drives the normally open vacuum bubble 4 and the normally closed vacuum bubble 5 to move to the original position through the clamping plate 7. When the line needs to be switched, since the switching break is inside the vacuum tube, no arc is generated, which can effectively avoid the influence of the arc on the surrounding environment and reduce the probability of safety accidents such as fire. Through the cooperation of the drive module 3 and the transmission frame 6, fast and accurate switching can be achieved, the switching efficiency is improved, the complexity of electrical contact is reduced, the reliability of the system is improved, and the complex line switching function is realized in a limited space, which is conducive to flexible deployment and integration in the power system.

[0025] like Figure 1-3 As shown, the driving module 3 includes a driving shell, a fixed iron core 8 is arranged in the driving shell, a guide shaft 9 is fixed on the end face of the fixed iron core 8, a moving iron core 10 is slid on the guide shaft 9, the end of the moving iron core 10 away from the fixed iron core 8 passes through the driving shell, and the end of the moving iron core 10 placed outside the driving shell drives the transmission frame 6 through the transmission shaft 11, and coils 12 are arranged circumferentially around the fixed iron core 8 and the moving iron core 10 in the driving shell, a plurality of limit seats 13 are fixed on the lower shell 2, and a plurality of support plates 14 are arranged on the side walls of the transmission reset system, and the support plates 14 and the limit seats 13 are counteracted by reset springs 15, and the elastic direction of the reset springs 15 is opposite to the driving direction of the driving module 3.

[0026] During use, by energizing the coil 12, the coil 12 generates magnetic force and attracts the moving iron core 10. The moving iron core 10 pulls the transmission frame 6 through the transmission shaft 11, so that the transmission frame 6 moves and compresses the reset spring 15. When recovery is required, the coil 12 is de-energized, and the elastic force of the reset spring 15 applies thrust to the transmission frame 6. The clamping plate 7 drives the normally open vacuum bubble 4 and the normally closed vacuum bubble 5 to recover through the movement of the rotating frame. The elastic force of the reset spring 15 automatically pushes the transmission frame 6 back to the initial position. No additional reset mechanism or power source is required, which simplifies the system structure and improves the reliability and stability of the system. The reset spring 15 also plays a role in buffering and shock absorption, reduces the vibration and noise caused by mechanical impact, and prolongs the service life of the equipment. The upper shell 1 is provided with a connecting groove for fixing the drive shell. The design of the drive shell and the connecting groove facilitates the fixing and disassembly of the drive module 3, which is conducive to the maintenance and replacement of the drive module 3. The electromagnetic drive formed by the cooperation of the fixed iron core 8, the moving iron core 10 and the coil 12 can achieve a quick response, so that the line arc extinguishing switching system can quickly switch the conducting line when needed, reducing possible power loss or equipment damage. The positioning accuracy of the transmission frame 6 during the movement process can be ensured by the limit seat 13 to prevent excessive movement of the transmission frame 6. The reset spring 15 keeps the transmission frame 6 stable during the movement process and keeps the forces of the transmission and reset system and the line arc extinguishing switching system balanced on the same plane when in the normal position.

[0027] like Figure 1-3As shown in Figures 5 and 6, the line arc extinguishing switching system is three groups of adjacent normally open vacuum bubbles 4 and normally closed vacuum bubbles 5, the mounting groove is a vertical T-shaped groove 16, the fixed ends of the normally open vacuum bubble 4 and the normally closed vacuum bubble 5 are fixedly connected with a fixed plate 18 through a fixed shaft 17, the movable ends of the normally open vacuum bubble 4 and the normally closed vacuum bubble 5 are fixedly connected with a movable plate 20 through a sliding rod 19, the fixed plates 18 are placed in the T-shaped groove 16, the movable plates 20 of the normally open vacuum bubble 4 and the normally closed vacuum bubble 5 are close to each other, and the movable plates 20 are connected by a connecting spring 27, and the group of line arc extinguishing switching systems is correspondingly provided with two clamping plates 7, the adjacent movable plates 20 are placed between the two clamping plates 7, and the bottom end of the clamping plate 7 is against the side wall of the sliding rod 19 through an arc-shaped recess 21.

[0028] During use, the T-shaped groove 16 can facilitate the lateral fixation of the normally open vacuum bubble 4 and the normally closed vacuum bubble 5, and also make them easier to disassemble and maintain, simplifying the maintenance process and reducing the maintenance cost. When the clamping plate 7 moves under the drive of the clamping frame, the normally closed vacuum bubble 5 is disconnected and the normally open vacuum bubble 4 is connected. When the clamping plate 7 drives the movable plate 20 on one side to move, the connecting spring 27 can apply pressure to the movable plate 20 on the other side to ensure the stability of disconnection and conduction, and also play a role in buffering and shock absorption. When the clamping plate 7 moves quickly, the connecting spring 27 can absorb part of the impact force to prevent the active end of the vacuum bubble from vibrating during the movement, thereby ensuring the stability of the arc extinguishing system and protecting the safety of the system supporting it. Prevent the movable plate 20 from being damaged due to excessive impact, thereby extending the service life of the vacuum bubble. The design of three groups of adjacent normally open vacuum bubbles 4 and normally closed vacuum bubbles 5 provides system redundancy. Even if a group has problems, the other groups can still keep working, improving the overall reliability of the system.

[0029] like Figure 2-4 As shown, the upper shell 1 is provided with a sliding hole 22, the transmission frame 6 is fixed with a transmission plate 23, the transmission plate 23 is provided with a transmission hole 24, the telescopic end of the drive module 3 is fixedly connected to the vertical transmission shaft 11, and the transmission shaft 11 passes through the sliding hole 22 and is placed in the transmission hole 24. The cooperation between the transmission shaft 11 and the transmission hole 24 makes the disassembly and installation of the drive module 3 simpler and faster, and does not require complicated tools or operations, reducing maintenance costs and time. The transmission shaft 11 is vertically inserted into the transmission plate 23, realizing the modularization of the drive module 3, making the installation, disassembly and replacement of the drive module 3 extremely simple, without the need for large-scale disassembly of the entire system, greatly reducing maintenance costs and time.

[0030] like Figure 2 , 5As shown in Figures 6 and 7, the limit seat 13 and the support plate 14 are provided with corresponding limit shafts 25, and the two ends of the reset spring 15 are sleeved on the limit shafts 25. The limit shafts 25 provide stable guidance and limit for the reset spring 15, ensuring the linear movement of the reset spring 15 during compression and extension, avoiding the possibility of spring tilt or displacement, reducing the possibility of spring distortion or deformation, thereby improving the overall stability and service life of the system. Since the reset spring 15 can be easily disassembled, the system can adjust the elastic force of the spring as needed to adapt to different operating conditions or load requirements, increasing the flexibility of the system.

[0031] like Figure 6 As shown, the top surface of the lower housing 2 is provided with a plurality of arcuate surfaces 26, and the arcuate surfaces 26 abut against the bottom surface of the transmission frame 6. Since the arcuate surfaces 26 reduce the contact area between the lower housing 2 and the transmission frame 6, the friction between the two is significantly reduced, thereby reducing the wear in long-term operation and extending the service life of the equipment. The arcuate surfaces 26 can also make the transmission frame 6 smoother during the sliding process, reduce the possibility of stagnation and jumping, and thus improve the smoothness and stability of the operation of the system.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A complete set of arc extinguishing devices for line switching of on-load tap-changing switches, characterized in that: The invention comprises an upper shell (1) and a lower shell (2), wherein a driving module (3) is fixed on the upper shell (1), and a plurality of mounting grooves are provided on the lower shell (2), wherein a line arc extinguishing switching system is fixedly connected to the mounting grooves, and the line arc extinguishing switching system comprises a normally open vacuum bubble (4) and a normally closed vacuum bubble (5), and a transmission frame (6) is slidably provided between the upper shell (1) and the lower shell (2), wherein the transmission frame (6) is driven by the driving module (3), and wherein a plurality of clamping plates (7) are provided on the transmission frame (6), and wherein the clamping plates (7) are clamped in a one-to-one correspondence with the movable ends of the normally open vacuum bubble (4) and the normally closed vacuum bubble (5).

2. A complete set of arc extinguishing devices for line switching of on-load voltage regulators according to claim 1, characterized in that: The drive module (3) comprises a drive housing, a fixed iron core (8) is arranged in the drive housing, a guide shaft (9) is fixed on the end surface of the fixed iron core (8), a moving iron core (10) is slidably arranged on the guide shaft (9), an end of the moving iron core (10) away from the fixed iron core (8) penetrates the drive housing, an end of the moving iron core (10) disposed outside the drive housing drives a transmission frame (6) through a transmission shaft (11), coils (12) are arranged around the fixed iron core (8) and the moving iron core (10) in the drive housing, a plurality of limit seats (13) are fixed on the lower housing (2), a plurality of support plates (14) are arranged on the side wall of the transmission reset system, the support plates (14) and the limit seats (13) are counteracted by reset springs (15), and the elastic force direction of the reset springs (15) is opposite to the driving direction of the drive module (3).

3. The complete set of line switching arc extinguishing device for on-load voltage regulator according to claim 1 is characterized in that: The line arc extinguishing switching system comprises three groups of adjacent normally open vacuum bubbles (4) and normally closed vacuum bubbles (5); the mounting grooves are vertical T-shaped grooves (16); the fixed ends of the normally open vacuum bubbles (4) and the normally closed vacuum bubbles (5) are fixedly connected to fixed plates (18) via fixed shafts (17); the movable ends of the normally open vacuum bubbles (4) and the normally closed vacuum bubbles (5) are fixedly connected to movable plates (20) via sliding rods (19); the fixed plates (18) are placed in the T-shaped grooves (16); the movable plates (20) of the normally open vacuum bubbles (4) and the normally closed vacuum bubbles (5) are close to each other, and the movable plates (20) are connected via connecting springs (27); the group of line arc extinguishing switching systems is correspondingly provided with two clamping plates (7); the adjacent movable plates (20) are placed between the two clamping plates (7); the bottom ends of the clamping plates (7) are abutted against the side walls of the sliding rods (19) via arc-shaped recesses (21).

4. The complete set of line switching arc extinguishing device for on-load voltage regulator according to claim 2 is characterized in that: The upper shell (1) is provided with a sliding hole (22), the transmission frame (6) is fixed with a transmission plate (23), the transmission plate (23) is provided with a transmission hole (24), the telescopic end of the drive module (3) is fixedly connected to a vertical transmission shaft (11), and the transmission shaft (11) passes through the sliding hole (22) and is placed in the transmission hole (24).

5. The complete set of line switching arc extinguishing device for on-load voltage regulator according to claim 2 is characterized in that: The limiting seat (13) and the supporting plate (14) are provided with corresponding limiting shafts (25), and the two ends of the return spring (15) are sleeved on the limiting shafts (25).

6. A complete set of line switching arc extinguishing devices for on-load voltage regulators according to claim 1, characterized in that: The lower shell (2) is provided with a plurality of arcuate surfaces (26), and the arcuate surfaces (26) abut against the bottom surface of the transmission frame (6).

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