Torsion bar main shaft of on-load tap-changer and on-load tap-changer

Abstract

The utility model discloses an on-load tap-changer torsion bar main shaft, the on-load tap-changer main shaft comprises a torsion bar main shaft body and a twist-off protection device, the torsion bar main shaft body comprises a main shaft, a shielding cover and a shaft seat, the shielding cover and the shaft seat are respectively arranged at two ends of the main shaft, and the main shaft, the shielding cover and the shaft seat are integrally arranged. And the twist-off protection device is arranged on one side, far away from the main shaft, of the shielding cover. The main shaft, the shielding cover and the shaft seat are integrally arranged, so that the structural strength is improved, the assembly difficulty is reduced, collision in assembly can be reduced, the labor cost and the quality cost are reduced, the twist-off protection device is independent, maintenance and replacement can be facilitated, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of on-load tap-changers, and particularly relates to a torsion rod main shaft of an on-load tap-changer and an on-load tap-changer. Background Art

[0002] An on-load tap-changer is a switching device that provides a constant voltage for a transformer when the load changes. Its basic principle is to switch between taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and ultimately achieving the purpose of voltage regulation. The switching of the on-load tap-changer gear position is a mechanical transmission action, and the mechanical transmission action is driven by an external operating mechanism of the on-load tap-changer. The operating mechanism passes through the transmission rod gearbox and then through the main shaft in the oil chamber of the on-load tap-changer to drive the switching switch, thereby achieving the purpose of switching the gear position.

[0003] The existing main shaft of the on-load tap-changer includes a main shaft and a coupling assembly clamped on both sides of the main shaft. The main shaft is made of a cylindrical epoxy fiberglass extrusion rod, and both ends are processed into squares for clamping and fixing with the coupling assembly. The coupling assembly is assembled by clamping a coupling joint and a shielding cover with bolts.

[0004] The existing main shaft of the on-load tap-changer has the following disadvantages: the main shaft body is easily damaged after being knocked and collided. After damage, the structural strength of the main shaft drops sharply, resulting in insufficient rigidity of the main shaft and not meeting the requirements of transmission torque; the main shaft body is a solid structure with a large weight ratio; the coupling part and the shielding cover adopt a split assembly structure, and clamping with the main shaft requires bolt fastening operations, increasing the requirements for process assembly; the shielding cover is an aluminum casting. Due to its complex shape, the qualified rate of the surface finish of the cast shielding surface is low, and it is easy to break, resulting in difficulty in ensuring quality. Summary of the Utility Model

[0005] In view of the above-mentioned prior art, the utility model provides a torsion rod main shaft of an on-load tap-changer to solve the problems of complex assembly and insufficient transmission torque existing in the existing torsion rod main shaft of the on-load tap-changer.

[0006] To achieve the above object, the technical solution adopted by the utility model is: to provide a torsion rod main shaft of an on-load tap-changer, including a torsion rod main shaft body and a torsion break protection device. The torsion rod main shaft body includes a main shaft, a shielding cover and a shaft seat respectively arranged at both ends of the main shaft. The main shaft, the shielding cover and the shaft seat are integrally arranged, and the torsion break protection device is arranged on the side of the shielding cover away from the main shaft.

[0007] The beneficial effects of the present utility model adopting the above technical solution are as follows: By integrally setting the main shaft, the shielding cover and the shaft seat, the assembly actions and the risk of assembly bumps are reduced, and the labor cost and quality cost are lowered. The torque protection device is separated to independently provide a torque-breaking protection mechanism. When torque damage occurs, while protecting the main shaft, it can also facilitate replacement and reduce after-sales maintenance costs. The shielding cover is improved into an integral structure, enhancing the structural strength.

[0008] On the basis of the above technical solution, the present utility model can also be further improved as follows.

[0009] Further, the main shaft, the shielding cover and the shaft seat are bonded into one body.

[0010] The beneficial effects of the present utility model adopting the above further technical solution are as follows: The bonding process can well control high precision, improve the product quality and reduce the cost.

[0011] Further, the main shaft is a hollow aramid fiber winding tube.

[0012] The beneficial effects of the present utility model adopting the above further technical solution are as follows: On the premise of reaching the torque level, the aramid winding tube is hollow, which can reduce the weight of the main shaft. The aramid fiber winding tube has good structural strength and excellent insulation. The electric field strength of the main shaft is far lower than the breakdown field strength of 80 kV / cm under transformer oil, improving the electric field condition and being more excellent in terms of temperature resistance and corrosion resistance.

[0013] Further, the shielding cover and the shaft seat are in spline fit with the main shaft.

[0014] The beneficial effects of the present utility model adopting the above further technical solution are as follows: Adopting a spline design to cooperate with the main shaft improves the anti-torsion strength of the main shaft, and can reach a level of > 750 N·m.

[0015] Further, the torque-breaking protection device includes a shaft head. The shaft head is connected to the shielding cover through a flange. The shielding cover is connected to the flange through screws. The shaft head is arranged in the middle of the flange and is connected to the flange through screws.

[0016] The beneficial effects of the present utility model adopting the above further technical solution are as follows: The connection method of the torque-breaking protection device to the main shaft is simple and easy to operate. When abnormal situations such as the main shaft of the on-load tap-changer getting stuck and breaking occur, the weak point, the torque-breaking protection device, breaks first, which can protect the main shaft and other mechanisms. At this time, only the damaged torque-breaking protection device needs to be disassembled and replaced with a new one to restore the function of the torque rod main shaft, improving the convenience of maintenance and the economy of replacing components. Separately setting the torque-breaking protection device is convenient for processing, thus reducing the cost.

[0017] Further, the flange is embedded in the shielding cover.

[0018] The beneficial effect of adopting the above further technical solution in this utility model is that embedding the flange in the shielding cover can make the connection between the torque-breaking protection device and the main shaft more stable.

[0019] This utility model also provides an on-load tap-changer, including the on-load tap-changer torque rod main shaft as described above.

[0020] The beneficial effect of this utility model is that by integrally setting the main shaft, the shielding cover and the shaft seat, the structural strength is improved, the device difficulty is reduced, the bumps during assembly can be reduced, and the labor cost and quality cost are lowered. By separately setting the torque-breaking protection device, it is convenient for maintenance and replacement, and the maintenance cost is reduced. Description of the Drawings

[0021] Figure 1 is an exploded view of this utility model;

[0022] Figure 2 is a sectional view of the torque rod main shaft body of this utility model;

[0023] Among them, 1, main shaft; 2, shielding cover; 3, shaft seat; 4, shaft head; 5, flange; 6, screw. Detailed Embodiment

[0024] The following will make a detailed description of the detailed embodiment of this utility model with reference to the drawings.

[0025] In the embodiment of this utility model, as Figures 1 - 2 shown, an on-load tap-changer torque rod main shaft is provided, including a torque rod main shaft body and a torque-breaking protection device.

[0026] The torque rod main shaft body includes a main shaft 1 and a shielding cover 2 and a shaft seat 3 respectively arranged at both ends of the main shaft 1. The main shaft 1 is a hollow aramid fiber winding tube, and the shielding cover 2 and the shaft seat 3 are in spline fit with the main shaft 1. The main shaft 1, the shielding cover 2 and the shaft seat 3 are bonded into one body by a vacuum bonding process. The shielding cover 2 and the shaft seat 3 can be made of aluminum alloy material, so as to improve the overall structural strength and surface finish, reduce the unqualified rate and fracture phenomenon of the shielding cover 2 and the shaft seat 3, and enhance the economic value.

[0027] The torque-breaking protection device includes a shaft head 4. The shaft head 4 is embedded in the side of the shielding cover 2 far from the main shaft 1 and is connected to the shielding cover 2 through a flange 5. The shielding cover 2 and the flange 5 are connected by screws. The shaft head 4 is arranged in the middle of the flange 5 and is connected to the flange 5 by screws 6.

[0028] Although the specific embodiments of the present utility model have been described in detail with reference to the accompanying drawings, it should not be construed as a limitation on the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative efforts still fall within the scope of protection of this patent.

Claims

1. A torsion bar main shaft of an on-load tap changer, characterized in that: The invention comprises a torsion bar main shaft body and a twist-off protection device, wherein the torsion bar main shaft body comprises a main shaft (1) and a shielding cover (2) and a shaft seat (3) respectively arranged at two ends of the main shaft (1); the main shaft (1), the shielding cover (2) and the shaft seat (3) are arranged in one piece, and the twist-off protection device is arranged on a side of the shielding cover (2) away from the main shaft (1).

2. The torsion bar main shaft of the on-load tap changer according to claim 1, characterized in that: The main shaft (1), the shielding cover (2) and the shaft seat (3) are bonded together into one body.

3. The torsion bar main shaft of the on-load tap changer according to claim 1 or 2, characterized in that: The main shaft (1) is a hollow aramid fiber wound tube.

4. The torsion bar main shaft of the on-load tap changer according to claim 3 is characterized in that: The shielding cover (2) and the shaft seat (3) are matched with the main shaft (1) via splines.

5. The torsion bar main shaft of the on-load tap changer according to claim 1, characterized in that: The twist-off protection device comprises a shaft head (4), the shaft head (4) being connected to the shielding cover (2) via a flange (5), the shielding cover (2) being connected to the flange (5) via screws, the shaft head (4) being arranged in the middle of the flange (5) and being connected to the flange (5) via screws (6).

6. The torsion bar main shaft of the on-load tap changer according to claim 5, characterized in that: The flange (5) is embedded in the shielding cover (2).

7. An on-load tap changer, characterized in that: The invention comprises the torsion bar main shaft of the on-load tap changer as claimed in any one of claims 1 to 6.

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