A vacuum arc extinguishing system for vacuum on-load tap changers

Abstract

This utility model provides a vacuum arc-extinguishing system for a vacuum on-load tap changer, including an upper mounting plate, a lower mounting plate, a vacuum bulb, a guide member, a pull rod, a limiting plate, a spring, a roller, a support member, and a lever. The guide member is fixed to the top of the upper mounting plate. The lower end of the pull rod is connected to the upper end of the vacuum bulb, and the upper end of the pull rod passes through the upper mounting plate and then through the guide member. The limiting plate is fixed on the pull rod and located between the vacuum bulb and the guide member. The spring is sleeved on the outside of the pull rod, with its upper end contacting the bottom of the guide member and its lower end contacting the top of the limiting plate. The roller is rotatably mounted inside the oil chamber. The support member is fixed to the bottom of the upper mounting plate and located between the pull rod and the roller. The lever is rotatably mounted on the support member, with one end sleeved on the pull rod and contacting the bottom of the limiting plate, and the other end located below the roller and cooperating with the roller. This utility model has a compact structure, reduces the number of cams to be processed, lowers manufacturing costs, has low installation difficulty, high installation and assembly efficiency, and a small size.

Description

Technical Field

[0001] This utility model relates to the field of vacuum on-load tap changer technology, and in particular to a vacuum arc extinguishing system for vacuum on-load tap changers. Background Technology

[0002] like Figure 1 The diagram shows the structure of an existing vacuum arc-extinguishing system. It mainly includes multiple supports mounted on the outside of an insulating main shaft and rotatable around it; an upper and lower mounting plate fixed to adjacent supports; a cam disk fixed to the insulating main shaft with multiple cams fixed to its outer edge; a vacuum bulb mounted between the upper and lower mounting plates; a pull rod connected to the movable contact of the vacuum bulb; a spring sleeved on the pull rod; a support fixed to the top of the upper mounting plate; a lever rotatably mounted on the support; a roller fixed to the lever and engaging with the cam; and the upper end of the pull rod connected to the other end of the lever. This vacuum arc-extinguishing system uses the rotation of the supports to move the lever, causing the roller on the lever to engage with the cam on the cam disk, thus rotating the lever and pulling the pull rod to break the vacuum bulb. However, this structure has the following drawbacks:

[0003] (1) The cam disk is composed of multiple cams, which are difficult to process, require high precision, and have high manufacturing costs.

[0004] (2) When one of the cams on the cam disk wears out, the entire cam disk needs to be replaced, which results in high material costs.

[0005] (3) When replacing the cam plate, the bracket and its moving contact system, vacuum arc extinguishing system and insulating spindle need to be removed before the cam plate can be replaced. After the replacement, the bracket and its moving contact system and vacuum arc extinguishing system need to be reinstalled. The replacement process is complicated.

[0006] (4) The cam disk is set on the insulating main shaft, which makes the bracket and its moving contact system and vacuum arc extinguishing system need to be moved outward by a certain distance to ensure the cooperation between the lever and the cam. This design increases the volume of the vacuum on-load tap changer switching core. The increase in the volume of the switching core requires the expansion of the oil chamber volume to ensure the assembly of the switching core, thus increasing the overall volume of the vacuum on-load tap changer, which ultimately increases the volume of the transformer and increases the manufacturing cost. Utility Model Content

[0007] To address the aforementioned problems, the purpose of this invention is to provide a vacuum arc extinguishing system for vacuum on-load tap changers that can effectively reduce material costs, manufacturing costs, save maintenance time, reduce installation difficulty, and improve installation and assembly efficiency.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] A vacuum arc-extinguishing system for a vacuum on-load tap changer includes an upper mounting plate, a lower mounting plate, and a vacuum bulb installed between the upper and lower mounting plates. It also includes a guide, a pull rod, a limiting plate, a spring, rollers, a support, and a lever. The guide is fixed to the top of the upper mounting plate and located directly above the vacuum bulb. The lower end of the pull rod is connected to the upper end of the vacuum bulb, and the upper end of the pull rod moves through a pre-set mounting hole on the upper mounting plate and then through the guide. The limiting plate is fixed to the pull rod and located between the vacuum bulb and the guide. The spring is sleeved on the pull rod and located within the mounting hole on the upper mounting plate, with its upper end contacting the bottom of the guide and its lower end contacting the top of the limiting plate. Multiple rollers are rotatably installed inside the oil chamber of the vacuum on-load tap changer. The support is fixed to the bottom of the upper mounting plate and located between the pull rod and the rollers. The lever is rotatably installed on the support, with one end sleeved on the pull rod and contacting the bottom of the limiting plate, and the other end located below the rollers and engaging with them. A cam is fixed at one end of the lever that engages with the roller.

[0010] This utility model has a compact structure. By fixing the cam integrally onto the lever and setting it outward, and placing the roller that cooperates with the cam on the inner wall of the oil chamber, the drive mechanism of the arc extinguishing system is optimized. This structure eliminates the traditional cam disc, requiring only one cam to meet the usage requirements. This reduces the number of cams, lowers the processing difficulty and cycle, effectively reduces material usage, reduces the volume of the switching core, and reduces material costs. At the same time, when the cam wears, the lever with the cam can be replaced without completely disassembling the arc extinguishing system and the moving contact system during maintenance. This significantly reduces maintenance time, lowers installation difficulty, and improves installation and assembly efficiency. Attached Figure Description

[0011] The present invention will now be described in further detail with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of an existing vacuum arc extinguishing system.

[0013] Figure 2 This is a schematic diagram of the vacuum arc extinguishing system for the vacuum on-load tap changer described in this utility model.

[0014] Figure 3 This is an enlarged view showing the positional relationship of the support, lever, and roller described in this utility model.

[0015] The following components are shown in the diagram: 1-Insulated spindle, 2-Upper mounting plate, 3-Lower mounting plate, 4-Vacuum bubble, 5-Pull rod, 6-Support component, 7-Shaft 2, 8-Lever, 9-Roller, 10-Cam, 11-Limiting plate, 12-Spring, 13-Guide component, 14-Screw, 15-Shaft 1, 16-Mounting bolt, 17-Oil chamber. Detailed Implementation

[0016] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. The described embodiments are merely some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0019] like Figure 2 and Figure 3 As shown, this embodiment provides a vacuum arc extinguishing system for a vacuum on-load tap changer, including an upper mounting plate 2, a lower mounting plate 3, a vacuum bulb 4, a guide 13, a pull rod 5, a limit plate 11, a spring 12, a roller 9, a support 6, and a lever 8.

[0020] Both the upper mounting plate 2 and the lower mounting plate 3 are installed on the outside of the insulating spindle 1 of the vacuum on-load tap changer. (The installation of the upper mounting plate 2 and the lower mounting plate 3 is applicable to two types of vacuum on-load tap changers: one is a vacuum on-load tap changer with a rotatable insulating spindle 1, and the other is a vacuum on-load tap changer with a non-rotatable insulating spindle 1. For a vacuum on-load tap changer with a rotatable insulating spindle 1, the upper mounting plate 2 and the lower mounting plate 3 are directly installed on the outer wall of the insulating spindle 1. The upper mounting plate 2, the lower mounting plate 3, and the vacuum arc extinguishing system drive the rotation of the vacuum arc extinguishing system relative to the oil chamber through the rotating insulating spindle 1. For a vacuum on-load tap changer with a non-rotatable insulating spindle 1, the upper mounting plate 2 and the lower mounting plate 3 are installed on a pre-set rotatable bracket outside the insulating spindle 1. The upper mounting plate 2, the lower mounting plate 3, and the vacuum arc extinguishing system drive the rotation of the vacuum arc extinguishing system relative to the oil chamber through the rotating bracket.) The upper mounting plate 2 is located directly above the lower mounting plate 3 and can rotate within the oil chamber 17 of the vacuum on-load tap changer. The upper mounting plate 2 is made of metal, and the lower mounting plate 3 is made of insulating material.

[0021] The vacuum bulb 4 is a conventional electrical component, installed between the upper mounting plate 2 and the lower mounting plate 3. The lower part of the vacuum bulb 4 is fixed to the lower mounting plate 3 by mounting bolts 16. The vacuum bulb 4 is connected in series in the current transition circuit system and the current carrying circuit system of the vacuum on-load tap changer, respectively, to play the role of opening and closing current, and to ensure that the arc is extinguished in the vacuum bulb 4 when the current is interrupted.

[0022] The guide member 13 is fixed to the top of the upper mounting plate 2 and located directly above the vacuum bubble 4. The middle part of the guide member 13 protrudes upward and has a polygonal guide hole on its protrusion to provide guidance for the pull rod 5 and prevent the pull rod 5 from rotating during movement.

[0023] The lower end of the pull rod 5 is connected to the upper end (movable contact) of the vacuum bubble 4 and can drive the vacuum bubble 4 to perform opening and closing actions. The upper end of the pull rod 5 moves through the preset mounting hole on the upper mounting plate 2 and slides into the guide hole of the guide member 13. The upper end of the pull rod 5 (which has a polygonal structure that matches the polygonal guide hole) matches the guide hole of the guide member 13 and can only move up and down (slide), but cannot rotate.

[0024] The limiting plate 11 is fixed on the pull rod 5 and located between the vacuum bubble 4 and the guide member 13, and it is located below the upper mounting plate 2.

[0025] The spring 12 is sleeved outside the pull rod 5 and located in the mounting hole of the upper mounting plate 2 (between the guide 13 and the limiting plate 11). The upper end of the spring 12 extends above the upper mounting plate 2 and contacts the bottom of the guide 13, while the lower end of the spring 12 extends below the upper mounting plate 2 and contacts the top of the limiting plate 11. The spring 12 provides a closing force to the vacuum bubble 4, ensuring reliable contact between the contacts (moving contacts and stationary contacts) inside the vacuum bubble 4.

[0026] The number of rollers 9 is multiple and they are rotatably installed inside the oil chamber 17 of the vacuum on-load tap changer via shafts 15; the shafts 15 are vertically fixed to the inner wall of the oil chamber.

[0027] The support 6 is fixed to the bottom of the upper mounting plate 2 by screws 14 and is located between the pull rod 5 and the roller 9.

[0028] The lever 8 has a straight-line structure. The middle part of the lever 8 is rotatably mounted on the support 6 via a shaft 2 7 (shaft 2 7 is perpendicular to shaft 1 15, used to mount the lever 8 on the support 6, and also provides a fulcrum for the rotation of the lever 8). One end of the lever 8 is sleeved on the pull rod 5 and contacts the bottom of the limiting plate 11, while the other end is located below the roller 9 and cooperates with the roller 9. The end of the lever 8 sleeved on the pull rod 5 has a U-shaped groove structure, and the pull rod 5 is located in this U-shaped groove structure. A cam 10 is integrally fixed to the end of the lever 8 that cooperates with the roller 9. The roller 9 is located on the movement trajectory of the cam 10, and the top two sides of the cam 10 are inclined surfaces.

[0029] When the insulated spindle 1 rotates and drives the lever 8 to rotate, the cam 10 rotates with the lever 8 and moves to contact the roller 9. One inclined surface of the cam 10 first contacts the roller 9. As the rotation continues, the roller 9 moves along the inclined surface to the top of the cam 10. The top of the cam 10 is pressed down by the roller 9 and moves down, thereby driving the lever 8 to rotate around the shaft 7. This causes the other end of the lever 8 (tilted upwards) to pry the limiting plate 11 and the pull rod 5 to move upwards, compressing the spring 12 and breaking the vacuum bubble 4. The cam 10 that opens and closes the vacuum bubble is integrated with the lever 8. Only one cam 10 is needed to meet the usage requirements, reducing the number of cams 10 and reducing the processing difficulty and cycle.

[0030] As the insulated spindle 1 continues to rotate and drives the lever 8 to rotate, the roller 9 moves from the top of the cam 10 to another inclined surface of the cam 10, and then disengages from the roller 9. The spring 12 releases its energy and extends, pushing the limit plate 11 and the pull rod 5 to move downward. At the same time, the end of the lever 8 that is in contact with the limit plate 11 also moves downward under the push of the limit plate 11, causing the lever 8 to rotate around the shaft 7, driving the end of the lever 8 with the cam 10 to move downward (to cooperate with the next roller 9). At the same time, the pull rod 5 moves downward to close the vacuum bubble 4.

[0031] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0032] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A vacuum arc-extinguishing system for a vacuum on-load tap changer, comprising an upper mounting plate, a lower mounting plate, and a vacuum bulb mounted between the upper and lower mounting plates, characterized in that: It also includes guide components, tie rods, limit plates, springs, rollers, support components, and levers; The guide is fixed to the top of the upper mounting plate and located directly above the vacuum bubble; The lower end of the pull rod is connected to the upper end of the vacuum bubble, and the upper end of the pull rod moves through the preset mounting hole on the upper mounting plate and then moves through the guide. The limiting plate is fixed on the pull rod and located between the vacuum bubble and the guide component; The spring is sleeved outside the pull rod and located in the mounting hole of the upper mounting plate. Its upper end contacts the bottom of the guide and its lower end contacts the top of the limiting plate. The number of rollers is multiple and they are rotatably installed on the inside of the oil chamber of the vacuum on-load tap changer; The support is fixed to the bottom of the upper mounting plate and located between the tie rod and the roller; The lever is rotatably mounted on the support, with one end of the lever sleeved on the pull rod and in contact with the bottom of the limiting plate, and the other end located below the roller and cooperating with the roller.

2. The vacuum arc-extinguishing system for vacuum on-load tap changers according to claim 1, characterized in that: A cam is fixed at one end of the lever that engages with the roller.

3. The vacuum arc-extinguishing system for vacuum on-load tap changers according to claim 2, characterized in that: The lever has a straight-line structure, and the cam is integrally fixed to the top of the end where the lever and roller meet.

4. The vacuum arc-extinguishing system for vacuum on-load tap changers according to claim 2, characterized in that: The top of the cam has two sloping surfaces on both sides.

5. The vacuum arc-extinguishing system for a vacuum on-load tap changer according to claim 1, characterized in that: The guide member has an upward protrusion in the middle and a polygonal guide hole on its protrusion. The upper end of the pull rod is a polygon that matches the polygonal guide hole, and the upper end of the pull rod is slidably disposed in the guide hole of the guide member.

6. The vacuum arc-extinguishing system for vacuum on-load tap changers according to claim 1, characterized in that: The lever is fitted onto the pull rod at one end in a U-shaped groove, and the pull rod is located within this U-shaped groove.

7. The vacuum arc extinguishing system for vacuum on-load tap changers according to claim 1, characterized in that: Both the upper and lower mounting plates are mounted on the insulating spindle of the vacuum on-load tap changer, with the upper mounting plate located directly above the lower mounting plate. The insulating spindle can rotate within the oil chamber of the vacuum on-load tap changer.

8. The vacuum arc extinguishing system for vacuum on-load tap changers according to claim 1, characterized in that: The upper mounting plate is made of metal, and the lower mounting plate is made of insulating material.

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