CN218449801U

CN218449801U - Device for eliminating shaft voltage of wind power gear box

Info

Publication number: CN218449801U
Application number: CN202222359194.7U
Authority: CN
Inventors: 王弘堃; 张凤梅; 刘雪梅; 郭文宇
Original assignee: Flender Transmission System Co ltd
Current assignee: Flender Transmission System Co ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2023-02-03
Anticipated expiration: 2032-09-05

Abstract

The utility model provides a device for eliminating wind-powered electricity generation gear box's axle voltage. A wind power gearbox including an output shaft made of an electrically conductive material, a bearing supporting the output shaft, and a stationary ground member, the apparatus comprising: a first electrically conductive seal mounted on the output shaft, the first electrically conductive seal being in electrical contact with the output shaft; and a second electrically conductive seal mounted on the stationary ground member, the second electrically conductive seal in electrical contact with the stationary ground member, the first and second electrically conductive seals providing sealing for the bearing and maintaining electrical contact during operation of the wind turbine gearbox. The utility model provides a device can eliminate the axle voltage of the output shaft that transmits the wind-powered electricity generation gear box from the generator when providing sealed for the bearing, has avoided causing the damage to the bearing that supports this output shaft, has prolonged the life of this bearing greatly.

Description

Device for eliminating shaft voltage of wind power gear box

Technical Field

The utility model relates to a wind generating set field. In particular, the present invention relates to a device for eliminating the shaft voltage of a wind power gearbox.

Background

In a wind turbine generator system, the output shaft of the wind turbine gearbox is connected to the rotor of the generator to transmit torque from the blade assembly to the generator for power generation. Meanwhile, the shaft voltage generated by the generator is reversely transmitted to the output shaft of the wind power gear box. When the shaft voltage increases beyond a certain threshold, the lubricating oil film in the sliding or rolling bearing supporting the output shaft will break down. At this point, a shaft current is formed and discharged through the bearing. Because the contact area in the bearing is small, high temperature can be generated instantaneously during discharging, so that the bearing is locally fused. This will severely shorten the service life of the bearing and even directly burn the bearing.

In order to solve the problems, a coupler is arranged between the existing double-fed wind power gear box and the generator. An insulating material is provided in the coupling for blocking the shaft voltage from the generator, thereby preventing the bearings of the wind power gearbox from being damaged.

However, the above solution is not applicable to semi-direct drive wind-powered gearboxes. In a wind generating set applying the semi-direct-drive wind power gear box, the semi-direct-drive wind power gear box is highly integrated with a generator, so that a rotor of the generator can be directly connected with an output shaft of the wind power gear box without a coupler and an insulating material arranged in the coupler. In this case, the shaft voltage of the generator may cause damage to the components of the wind power gearbox because it is not blocked.

It is under the above-mentioned background that the utility model discloses.

Disclosure of Invention

The utility model aims at providing a device for eliminating wind-powered electricity generation gear box's axle voltage, one or more in the defect that the device can solve existence among the prior art.

The utility model provides a device for eliminating wind-powered electricity generation gear box's axle voltage, wind-powered electricity generation gear box includes the output shaft made by conducting material, the bearing and the static ground connection part of supporting output shaft, the device includes: a first electrically conductive seal mounted on the output shaft, the first electrically conductive seal being in electrical contact with the output shaft; and a second electrically conductive seal mounted on the stationary ground component, the second electrically conductive seal in electrical contact with the stationary ground component, and wherein the first and second electrically conductive seals provide sealing for the bearing and maintain electrical contact during operation of the wind power gearbox, thereby forming a shaft voltage conduction path that is: an output shaft-a first conductive seal-a second conductive seal-a stationary grounded component.

In an embodiment according to the invention, the first electrically conductive sealing element is an annular electrically conductive sealing element.

In an embodiment according to the invention, the annular conductive seal is made of steel.

In an embodiment according to the invention, the annular conductive seal is transition fitted with the output shaft.

In one embodiment according to the present invention, the second conductive seal is a contact seal made of a conductive material, which is kept in contact with the first conductive seal and the bearing during operation of the wind power gearbox.

In an embodiment according to the present invention, the stationary ground part is provided with a manhole in which a device for replacing the first and second conductive sealing members is installed.

In an embodiment according to the invention, the stationary ground part is a box of a wind power gearbox.

In an embodiment according to the invention, the stationary ground part is an end cover of a box of a wind power gearbox.

According to the utility model discloses a device for eliminating wind-powered electricity generation gear box's axle voltage can eliminate the axle voltage of the output shaft that transmits the wind-powered electricity generation gear box from the generator when providing sealed for the bearing, has avoided causing the damage to the bearing that supports this output shaft, has prolonged the life of this bearing greatly. And simultaneously, according to the utility model discloses a device for eliminating wind-powered electricity generation gear box's axle voltage can use with various types of generators and wind-powered electricity generation gear box jointly, can use with half direct-drive wind power generation machine jointly especially, consequently can wide application in various scenes.

Drawings

The above and other features and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses preferred embodiments of the present invention. Wherein:

fig. 1 is a schematic view of an apparatus for eliminating shaft voltage of a wind power gearbox according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following embodiments are provided to further describe the present invention in detail. It should be understood that the discussion of the embodiments is intended only to enable those skilled in the art to better understand and thereby practice the present invention, and is not intended to limit the scope of the present invention in any way. Various embodiments may omit, replace, or add various components as needed.

As used herein, the term "include" and its variants are intended to have an open meaning, i.e., "including but not limited to". The term "one embodiment" means "at least one embodiment". The term "another embodiment" means "at least one other embodiment". Furthermore, the definition of a term is consistent throughout the specification unless the context clearly dictates otherwise.

Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Fig. 1 is a schematic diagram of an apparatus for eliminating shaft voltage of a wind power gearbox according to an embodiment of the present invention.

As shown in fig. 1, the device for eliminating the shaft voltage of the wind power gearbox according to one embodiment of the present invention is installed between the box body 1 and the output shaft 2 of the wind power gearbox. The output shaft 2 is connected to a generator. The end of the wind power gearbox opposite the output shaft 2 is connected to the blade assembly. The starter motor and blade assembly are not shown in order to unnecessarily obscure the focus of the present invention. During the operation, the blade subassembly rotates under the effect of coming wind, drives the inside transmission part of wind-powered electricity generation gear box and moves to convert the low rotational speed of blade subassembly into high rotational speed, and transmit this high rotational speed for the generator via wind-powered electricity generation gear box's output shaft 2 and generate electricity.

Fig. 1 also shows a bearing 3 for supporting the output shaft 2. Those skilled in the art will appreciate that in order to avoid the intrusion of dust, moisture, debris, etc. into the bearing 3, while avoiding the loss of lubricant, a seal is typically provided at the end of the bearing 3. However, conventional seals can only be used for sealing purposes.

The utility model adopts the following ideas: a conventional seal for the bearing 3 is given an electrically conductive function to form a means for eliminating the shaft voltage of the wind power gearbox. Therefore, the device not only can provide sealing for the bearing 3, but also can transmit the shaft voltage from the generator to the box body 1 of the wind power gear box, so that the shaft voltage is prevented from damaging the bearing 3 and other components.

Specifically, the device comprises a first conductive sealing element 4 installed on the output shaft 2 and a second conductive sealing element 5 installed on the box body 1 of the wind power gear box. Preferably, the first conductive seal 4 is an annular conductive seal. More preferably, the annular conductive seal is made of steel. The annular conductive seal is transition fitted with the output shaft 2 of the wind power gearbox such that the annular conductive seal and the output shaft 2 remain relatively stationary and in electrical contact during operation of the wind power gearbox. Preferably, the second conductive seal 5 is a contact seal made of a conductive material. The contact seal is maintained in contact with the first electrically conductive seal 4 and the bearing 3 during operation of the wind power gearbox. Thereby, the shaft voltage on the output shaft 2 can be conducted to the case 1 via the first and second

conductive seals

4, 5, i.e. the following shaft voltage conducting paths are formed: an output shaft 2, a first conductive sealing element 4, a second conductive sealing element 5 and a box body 1. As the box body 1 is grounded, the shaft voltage can be led into the ground, and the wind power gear box is prevented from being damaged by the shaft voltage.

Compare in modes such as traditional labyrinth seal, above-mentioned device adopts two sealing member direct contact complex forms, has reduced the clearance between the part, and sealing reliability is higher, moreover easy dismouting more.

In one embodiment according to the present invention, the second conductive sealing member 5 is mounted on an end cover 6 of the box body 1 of the wind power gear box, and the end cover 6 is grounded. However, the present invention is not limited thereto, and the second conductive seal 5 can be mounted on any stationary grounded component of the wind power gearbox.

In still another embodiment according to the present invention, a manhole (not shown in the figure) is provided on the static grounding part of the wind power gear box, in particular on the box of the wind power gear box, more in particular on the end cover 6 of the box of the wind power gear box, and a device for replacing the first conductive sealing member and the second conductive sealing member is installed in the manhole, so as to facilitate the maintenance and replacement of the device.

The utility model provides a device for eliminating wind-powered electricity generation gear box's axle voltage can eliminate the axle voltage of the output shaft that transmits the wind-powered electricity generation gear box from the generator when providing sealed for bearing 3, moreover, if wind-powered electricity generation gear box self produces axle voltage during the operation, the device also can eliminate it to avoid causing the damage to bearing 3 of the output shaft of supporting wind-powered electricity generation gear box. Furthermore, the utility model provides a device reforms transform in the inside of wind-powered electricity generation gear box, has practiced thrift the overall dimension of wind-powered electricity generation gear box greatly, even also can implement on half direct drive driven wind-powered electricity generation gear box.

Additionally, the utility model provides a device sets up on the output shaft of the wind-powered electricity generation gear box that the rotational speed is lower relatively, compares with setting up the device on the rotor of the generator that the rotational speed is higher relatively, can slow down the rate of wear of device to can prolong device's life.

It should be understood that the foregoing is presented by way of illustration only and not by way of limitation. It is contemplated that various substitutions and modifications may be made to the described embodiments without departing from the spirit and scope of the invention.

Claims

1. A device for eliminating shaft voltage of a wind power gearbox comprising an output shaft (2) made of an electrically conductive material, a bearing (3) supporting the output shaft (2) and a stationary grounding part, the device comprising:

a first electrically conductive seal (4) mounted on the output shaft (2), the first electrically conductive seal (4) being in electrical contact with the output shaft (2); and

a second electrically conductive seal (5) mounted on the stationary ground member, the second electrically conductive seal (5) being in electrical contact with the stationary ground member and

wherein the first and second electrically conductive seals (4, 5) provide sealing for the bearing (3) and maintain electrical contact during operation of the wind power gearbox, forming shaft voltage conduction paths as follows: the output shaft (2), the first electrically conductive seal (4), the second electrically conductive seal (5), is a stationary ground member.

2. Device for eliminating shaft voltage of a wind power gearbox according to claim 1, characterized in that the first electrically conductive seal (4) is an annular electrically conductive seal.

3. An arrangement for dissipating shaft voltage of a wind power gearbox according to claim 2, characterized in that the annular conductive seal is made of steel.

4. Device for eliminating shaft voltage of a wind power gearbox according to claim 2 or 3, characterized in that the annular conductive seal is transition fitted with the output shaft (2).

5. Device for eliminating shaft voltage of a wind power gearbox according to claim 1, characterized in that the second electrically conductive seal (5) is a contact seal made of electrically conductive material, which contact seal is kept in contact with the first electrically conductive seal (4) and the bearing (3) during operation of the wind power gearbox.

6. Device for eliminating shaft voltage of wind power gearboxes according to claim 1, characterized in that the stationary grounding part is provided with a manhole in which means for replacing the first (4) and second (5) conductive seals are installed.

7. Device for eliminating shaft voltage of a wind power gearbox according to claim 1, characterised in that the stationary grounding part is the box of the wind power gearbox.

8. Device for eliminating shaft voltage of a wind power gearbox according to claim 7, characterized in that the stationary grounding part is an end cover (6) of the box of the wind power gearbox.