Vacuum tube driving cam structure of vacuum on-load tap changer

Abstract

The application relates to a partial component of a load tap changer, in particular to a vacuum tube driving cam structure of a vacuum load tap changer. The vacuum tube driving cam structure of the vacuum load tap changer comprises a vacuum tube, and is characterized in that: a vacuum tube pull rod is connected to a moving end of the vacuum tube; a vacuum tube reset spring is sleeved on the outer periphery of the vacuum tube pull rod; a vacuum tube reset spring base is sleeved on the vacuum tube reset spring; a driving lever is sleeved on the outer periphery of the vacuum tube reset spring base; the vacuum tube pull rod, the vacuum tube reset spring base and the driving lever are penetrated by a vacuum tube driving shaft; the vacuum tube driving shaft is provided with a vacuum tube driving roller located in the vacuum tube reset spring base; a driving lever roller is connected to the driving end of the driving lever; and the driving lever roller is located in the guide rail of a cam disc. The application has the beneficial effect that the driving of the vacuum tube is labor-saving and accurate, thereby reducing the design difficulty of the vacuum switch and improving the reliability of the vacuum switch.

Description

(I) Technical Field

[0001] This invention relates to a partial component of an on-load tap changer, and more particularly to a vacuum tube drive cam structure for a vacuum on-load tap changer. (II) Background Technology

[0002] With the development of on-load tap changer technology, vacuum on-load tap changers have become the mainstream trend, and mechanical contact type tap changers will gradually decrease. This solves the problems of easy contact burnout and oil contamination in traditional mechanical contact type on-load tap changers, thus greatly improving the lifespan and maintenance cycle of the switch. Vacuum on-load tap changers achieve tap switching by opening and closing the vacuum tube, which is driven by a drive mechanism. Therefore, the quality of the drive mechanism is crucial to the vacuum on-load tap changer. Existing drive mechanisms, such as those in patent application number 201080042683.7, involve a drive cam 23 and a drive lever 8 that are subjected to inclined plane force during the drive process, which can be vertically decomposed into two forces. One force is in the same plane as the vacuum tube axis and is used to drive the vacuum tube. The other component does not affect the drive of the vacuum tube and can even create driving resistance due to the swing of the drive lever, thus weakening the drive of the vacuum tube. (III) Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this invention provides a vacuum tube drive cam structure for a vacuum on-load tap changer that has low driving resistance and is stable and reliable.

[0004] This invention is achieved through the following technical solution:

[0005] A vacuum tube drive cam structure for a vacuum on-load tap changer includes a vacuum tube, characterized in that: the moving end of the vacuum tube is connected to a vacuum tube pull rod, a vacuum tube return spring is sleeved on the outer periphery of the vacuum tube pull rod, a vacuum tube return spring base is sleeved on the vacuum tube return spring, a drive lever is sleeved on the vacuum tube return spring base, a vacuum tube drive shaft passes through the vacuum tube pull rod, the vacuum tube return spring base, and the drive lever, a vacuum tube drive roller located inside the vacuum tube return spring base is provided on the vacuum tube drive shaft, the driving end of the drive lever is connected to the drive lever roller, and the drive lever roller is placed in the guide rail of the cam disk.

[0006] The drive lever roller is mounted on the active end of the drive lever via a drive roller shaft.

[0007] The passive end of the drive lever is hinged to the drive lever support via the drive lever pivot.

[0008] The vacuum tube pull rod is screwed with a vacuum tube pull rod adjusting nut. The vacuum tube return spring is radially fixed by the boss of the vacuum tube pull rod adjusting nut and axially fixed by the lower end face of the boss of the vacuum tube pull rod adjusting nut.

[0009] The vacuum tube pull rod adjusting nut is tightened to lead out the connecting piece to the moving end face of the vacuum tube.

[0010] The beneficial effects of this invention are: the cam driving force and the base hinge position are in the same plane, avoiding the dispersion of the cam driving force; the spring base moves up and down with the driving lever, and the compression of the return spring is different when the vacuum tube is open and closed, so there is no need to overcome the pressure of the return spring to open the vacuum tube during the opening process; this makes the driving of the vacuum tube less strenuous and more accurate, thereby reducing the difficulty of vacuum switch design and improving the reliability of the vacuum switch. (iv) Description of the attached drawings

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

[0012] Appendix Figure 1 This is a three-dimensional structural diagram of the present invention;

[0013] Appendix Figure 2 For the appendix Figure 1 A sectional view;

[0014] Appendix Figure 3 For the appendix Figure 1 A top-view structural diagram;

[0015] In the diagram, 1 is the vacuum tube, 2 is the vacuum tube pull rod, 3 is the vacuum tube return spring, 4 is the vacuum tube return spring base, 5 is the drive lever, 6 is the vacuum tube drive shaft, 7 is the vacuum tube drive roller, 8 is the drive lever roller, 9 is the cam plate, 10 is the guide rail, 11 is the drive roller shaft, 12 is the drive lever shaft, 13 is the drive lever support, 14 is the vacuum tube pull rod adjusting nut, and 15 is the lead-out connecting piece. (V) Detailed Implementation Methods

[0016] The attached figure illustrates a specific embodiment of the present invention. This embodiment includes a vacuum tube 1, with its moving end connected to a vacuum tube pull rod 2. A vacuum tube return spring 3 is sleeved around the outer periphery of the vacuum tube pull rod 2. A vacuum tube return spring base 4 is sleeved on the vacuum tube return spring 3. A drive lever 5 is sleeved around the vacuum tube return spring base 4. A vacuum tube drive shaft 6 passes through the vacuum tube pull rod 2, the vacuum tube return spring base 4, and the drive lever 5. A vacuum tube drive roller 7, located within the vacuum tube return spring base 4, is mounted on the vacuum tube drive shaft 6. The driving end of the drive lever 5 is connected to a drive lever roller 8, which is placed within the guide rail 10 of the cam disk 9. The drive lever roller 8 is mounted to the driving end of the drive lever 5 via a drive roller shaft 11. The driven end of the drive lever 5 is hinged to a drive lever support 13 via a drive lever pivot 12. Vacuum tube pull rod 2 is screwed with vacuum tube pull rod adjusting nut 14. Vacuum tube return spring 3 is radially fixed by the boss of vacuum tube pull rod adjusting nut 14 and axially fixed by the lower end face of the boss of vacuum tube pull rod adjusting nut 14. Vacuum tube pull rod adjusting nut 14 presses the lead-out connecting piece 15 to the moving end face of vacuum tube 1.

[0017] The vacuum tube drive cam structure of the vacuum on-load tap changer of this invention is used. The fixed end of the vacuum tube 1 is fixed, and the end face of the moving end contacts the lead-out connecting piece 15. The vacuum tube pull rod 2 is screwed into the moving end of the vacuum tube 1 through a thread. The vacuum tube pull rod adjusting nut 14 is screwed onto the vacuum tube pull rod 2 through a thread and presses the lead-out connecting piece 15 to the moving end of the vacuum tube 1. The vacuum tube return spring 3 is radially fixed by the boss of the vacuum tube pull rod adjusting nut 14 and axially fixed by the lower end face of the boss of the vacuum tube pull rod adjusting nut 14. The vacuum tube return spring base 4 is sleeved on the vacuum tube return spring 3, and the inner hole step of the vacuum tube return spring base 4 presses against the upper end face of the vacuum tube return spring 3. The drive lever support 13 is fixed, and the drive lever 5 is hinged to the drive lever support 13 through the drive lever rotating shaft 12. The drive lever 5 is connected to the vacuum tube pull rod 2 and the vacuum tube return spring base 4 through the vacuum tube drive shaft 6 and the vacuum tube drive roller 7. The drive lever 5 is connected to the drive lever roller 8 via the drive roller shaft 11, and the drive lever roller 8 slides within the guide rail 10 in the cam disk 9. The plane in which the drive lever 5 swings within the hinge is tangent to the central cylindrical surface of the guide rail 10 of the cam disk 9.

[0018] The vacuum tube drive cam structure of the vacuum on-load tap changer of this invention drives a circular cam disk 9 through the release of the energy storage mechanism. The circular cam disk 9 has bidirectional circular cam guide rails 10 with varying heights designed according to the various programs of the vacuum switch. The rotation of the cam disk 9 drives the drive lever 5 to swing. The swing of the drive lever 5 is transmitted to the vacuum tube pull rod 2 and the vacuum tube return spring base 4 through the vacuum tube drive shaft 6 and the two vacuum tube drive rollers 7 on both sides. The vacuum tube return spring base 4 and the vacuum tube pull rod 2 are flexibly connected by a vacuum tube return spring 3. The vacuum tube pull rod 2 is connected to the moving end of the vacuum tube 1. The opening of the vacuum tube 1 is achieved by the vacuum tube drive shaft 6 pulling the vacuum tube pull rod 2. The closing of the vacuum tube 1 is achieved by the vacuum tube return spring base 4 pushing the vacuum tube return spring 3, which then applies force to the vacuum tube pull rod 2. The diameter center cylindrical surface of the guide rail 10 of the cam disk 9 is tangent to the swing plane of the drive lever 5. Therefore, when the guide rail 10 of the cam disk 9 drives the drive lever 5 to swing, its force range is always limited within its swing plane.

[0019] The vacuum tube drive cam structure of the vacuum on-load tap changer of the present invention has the following opening process (vacuum tube closed state): the cam disk 9 rotates under the action of the drive mechanism. During the rotation, the lower inclined surface of the guide rail 10 drives the drive lever roller 8 to rise. The rise of the drive lever roller 8 drives the drive lever 5 to swing upward, thereby driving the vacuum tube drive shaft 6 and the vacuum tube drive roller 7 to move upward. The vacuum tube drive roller 7 drives the vacuum tube return spring base 4 to move upward. During the upward movement of the vacuum tube drive shaft 6, it first moves a small distance in the slot of the vacuum tube pull rod 2 and then contacts the upper end of the slot, driving the vacuum tube pull rod 2 to move upward and open the vacuum tube 1. The cam disk 9 continues to rotate, and the drive lever roller 8 rises to the top of the inclined surface of the lower guide rail 10 and reaches the plane of the guide rail 10. The vacuum tube 1 is opened to the designed distance. The vacuum tube drive shaft 6 contacts the upper end of the slot of the vacuum tube pull rod 2, and the opening of the vacuum tube 1 is completed. During the entire opening process, the vacuum tube return spring 3 does not generate compression to cause opening resistance. The entire opening process only overcomes the self-closing force of the vacuum tube 1.

[0020] The closing process (vacuum tube open state) is as follows: cam disk 9 rotates under the action of the drive mechanism. During rotation, the inclined surface on guide rail 10 drives the drive lever roller 8 to descend. The descent of drive lever roller 8 causes drive lever 5 to swing downward, thereby driving vacuum tube drive shaft 6 and vacuum tube drive roller 7 to move downward. Vacuum tube drive roller 7 drives vacuum tube return spring base 4 to move downward. During the movement, the vacuum tube return spring 3 is compressed, creating a thrust applied to vacuum tube pull rod adjusting nut 14. This thrust is then transmitted through vacuum tube pull rod adjusting nut 14 to vacuum tube pull rod 2, forming a closed loop. The combined thrust, along with the self-closing force of vacuum tube 1, forms a comprehensive closing thrust. During the downward movement of vacuum tube drive shaft 6, it first moves within the slot of vacuum tube pull rod 2 without generating a downward thrust on vacuum tube pull rod 2. Under the action of the closing thrust, the moving end of vacuum tube 1 moves downward, cam disk 9 continues to rotate, and drive lever roller 8 descends to the bottom of the upper guide rail inclined surface and reaches the plane of guide rail 10. Vacuum tube 1 closes, and a certain distance is left between vacuum tube drive shaft 6 and the upper end of the slot of vacuum tube pull rod 2. Vacuum tube 1 closure is completed, and vacuum tube return spring 3 and vacuum tube 1 self-closing form the contact pressure of vacuum tube 1.

[0021] Throughout the opening and closing process of the vacuum tube 1, when the guide rail 10 of the cam disk 9 and the drive lever roller 8 are subjected to force, the direction of the force and the swing direction of the drive lever 5 are always in the same plane.

Claims

1. A vacuum tube drive cam structure for a vacuum on-load tap changer, comprising a vacuum tube (1), characterized in that: The moving end of the vacuum tube (1) is connected to the vacuum tube pull rod (2). A vacuum tube return spring (3) is sleeved on the outer periphery of the vacuum tube pull rod (2). A vacuum tube return spring base (4) is sleeved on the vacuum tube return spring (3). A drive lever (5) is sleeved on the vacuum tube return spring base (4). A vacuum tube drive shaft (6) passes through the vacuum tube pull rod (2), the vacuum tube return spring base (4), and the drive lever (5). A vacuum tube drive roller (7) is provided on the vacuum tube drive shaft (6) and located inside the vacuum tube return spring base (4). The moving end of the drive lever (5) is connected to the drive lever. Roller (8), drive lever roller (8) is placed in the guide rail (10) of cam disk (9); drive lever roller (8) is installed on the active end of drive lever (5) through drive roller shaft (11); passive end of drive lever (5) is hinged to drive lever support (13) through drive lever shaft (12); vacuum tube pull rod adjusting nut (14) is screwed onto vacuum tube pull rod (2), vacuum tube return spring (3) is radially fixed through the boss of vacuum tube pull rod adjusting nut (14), and axially fixed through the lower end face of the boss of vacuum tube pull rod adjusting nut (14); vacuum tube pull rod adjustment Nut (14) presses the lead-out connecting piece (15) to the moving end face of vacuum tube (1); its opening process is as follows: cam disk (9) rotates under the action of the drive mechanism. During the rotation, the lower inclined surface of guide rail (10) drives the drive lever roller (8) to rise. The rise of drive lever roller (8) drives drive lever (5) to swing upward, thereby driving vacuum tube drive shaft (6) and vacuum tube drive roller (7) to move upward. Vacuum tube drive roller (7) drives vacuum tube reset spring base (4) to move upward. During the upward movement of vacuum tube drive shaft (6), first at vacuum tube pull rod (2) After moving a short distance within the slot, it contacts the upper end of the slot, causing the vacuum tube pull rod (2) to move upward and pull open the vacuum tube (1). The cam disk (9) continues to rotate, driving the lever roller (8) to rise to the top of the inclined plane of the lower guide rail (10) and reach the plane of the guide rail (10). The vacuum tube (1) is pulled open to the designed distance from the moving end of the vacuum tube. The vacuum tube drive shaft (6) contacts the upper end of the slot of the vacuum tube pull rod (2), and the opening of the vacuum tube (1) is completed. During the entire opening process, the vacuum tube reset spring (3) does not generate compression, causing opening resistance. The entire opening process only overcomes the self-closing force of the vacuum tube (1).

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