CN220979779U - Device for restraining backward movement of main shaft system of wind turbine generator system - Google Patents

Abstract

The utility model relates to the field of wind driven generators, in particular to a device for restraining a main shaft system of a wind turbine from moving backwards. The motor unit comprises a bearing seat arranged on a motor unit main shaft, and a bearing is arranged between the bearing seat and the motor unit main shaft; a bearing front cover is arranged on one side of the bearing close to the motor group, and a bearing rear cover is arranged on one side of the bearing far away from the motor group; the end face, close to the bearing, of the bearing rear cover is provided with a plurality of first magnet blocks, and the end face, close to the bearing, of the bearing rear cover is fixedly provided with second magnet blocks corresponding to the first magnet blocks. Through increasing two rows of magnet pieces around between the outer loop of front bearing and rear bearing lid, the axial force of main shaft is passed through on the front bearing to the magnet piece mutual repulsion on the front bearing frame, makes the front bearing bear certain axial force, reduces rear bearing axial force to there is spring buffering between rear row magnet piece and the rear end cover, increases rear bearing life.

Description

Device for restraining backward movement of main shaft system of wind turbine generator system

Technical Field

The utility model relates to the field of wind driven generators, in particular to a device for restraining a main shaft system of a wind turbine from moving backwards.

Background

Most of the wind power generation industry before 10 years is assembled with 1.5MW wind power generation units, and most of the 1.5MW wind power generation units show a main shaft system backward fault along with the time, and many new energy operators have to choose to hoist the main shaft system of the wind power generation unit to be lowered to replace the main shaft system when facing the fault, so that high hoisting cost and high main shaft system spare part cost are spent, and meanwhile, the main shaft system must be stopped during hoisting, so that the generating capacity of the whole wind power plant is influenced.

The front and rear bearings of a large batch of 1.5MW wind turbine generator main shaft systems in the market at present adopt aligning roller bearings, and the bearings are characterized by relatively easy assembly process and low economic cost, but have the disadvantage of not bearing larger axial force. The design is initially considered that the double-row rollers are stressed simultaneously, but after practical application, the bearing is found that when the bearing is subjected to axial thrust, the received force is transmitted to the outer ring of the bearing through the main bearing, in the process, the front row of rollers are basically not stressed, the rear row of rollers are stressed greatly, and finally the roller path is crushed. Under the condition that the lubrication condition is kept good, the working condition can be used for several years, but the lubrication condition is poor due to the fact that the wind field environment is mostly severe, and the service life of the bearing is greatly reduced. The edge of the bearing outer ring is worn by long-time operation, when sudden wind occurs, the chamfer of the bearing outer ring is impacted to generate spalling, and scrap iron generates larger friction force between the roller and the bearing outer ring, so that the roller and the bearing outer ring are seriously worn. Because of the existence of scrap iron in the lubricating oil, not only is the lubricating effect lost, but also the bearing is damaged to different degrees in various places due to long-time operation. When the bearing is always under the working condition, the raceway abrasion causes the play to be larger and larger, and the clearance between the rear row bearing rollers of the fixed end shaft and the raceway is larger, so that the phenomenon of shaft system backward movement occurs after the bearing bears axial force.

Disclosure of utility model

In order to solve the technical problem that a spindle system of a wind turbine generator spindle moves backwards, the application provides a mechanical structure for transmitting and dispersing axial force born by the wind turbine generator, and mechanical abrasion of the spindle system caused by the axial force is relieved, so that the service life of the spindle system is prolonged.

The technical scheme adopted by the utility model is that the device for restraining the backward movement of the main shaft system of the wind turbine unit comprises a bearing seat arranged on the main shaft of the wind turbine unit, wherein a bearing is arranged between the bearing seat and the main shaft of the wind turbine unit;

A bearing front cover is arranged on one side of the bearing close to the motor group, and a bearing rear cover is arranged on one side of the bearing far away from the motor group;

The end face, close to the bearing, of the bearing rear cover is provided with a plurality of first magnet blocks, and the end face, close to the bearing, of the bearing rear cover is fixedly provided with second magnet blocks corresponding to the first magnet blocks.

Further, the first magnet block is fixed on the bearing through a first bolt.

Further, the second magnet block is fixed on the back cover through a second bolt.

Further, two first counter bores are machined in the first magnet block.

Further, two second counter bores are processed on the second magnet block.

Further, the first bolt is a spring bolt.

Further, the bearing is a self-aligning roller bearing.

Further, the number of the first magnet blocks is 18.

Further, a positioning ring is arranged between the bearing front cover and the bearing.

Further, an adjusting pad is arranged between the positioning ring and the bearing.

Compared with the prior art, the utility model has the beneficial effects that: through increasing two rows of magnet pieces around between the outer loop of front bearing and rear bearing lid, the axial force of main shaft is passed through on the front bearing to the magnet piece mutual repulsion on the front bearing frame, makes the front bearing bear certain axial force, reduces rear bearing axial force to there is spring buffering between rear row magnet piece and the rear end cover, increases rear bearing life. The scheme adopts 18 groups of magnet blocks. Under the condition that the spindle does not generate axial force, the thrust of the magnet block is borne by the bearing outer ring, the bearing front cover and the bearing rear cover, and the front bearing does not bear axial load.

Drawings

FIG. 1 is a schematic diagram of a device for preventing a main shaft system of a wind turbine from moving backwards;

FIG. 2 is a schematic diagram of the force transmission path of the present application and the prior art for throttling the backward movement of the main shaft system of a wind turbine;

Wherein: the motor comprises a 1-motor main shaft, a 2-bearing, a 3-first bolt, a 4-first magnet block, a 5-bearing seat, a 6-bearing front cover, a 7-second magnet block, an 8-positioning ring, a 9-adjusting pad, a 10-second bolt and a 11-bearing rear cover.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, the present embodiment provides a device for restraining a main shaft system of a wind turbine unit from moving backward, which includes a bearing seat 5 mounted on a main shaft 1 of the wind turbine unit, a bearing 2 is mounted between the bearing seat 5 and the main shaft 1 of the wind turbine unit, and the bearing 2 is a self-aligning roller bearing;

A bearing front cover 6 is arranged on one side of the bearing 2 close to the motor unit, and a bearing rear cover 11 is arranged on one side of the bearing 2 far from the motor unit;

The end face, close to the bearing 2, of the bearing rear cover 11 is provided with a plurality of first magnet blocks 4, and the first magnet blocks 4 are fixed on the bearing rear cover 11 through first bolts 3; the end face of the bearing 2, which is close to the bearing rear cover 11, is fixed with a second magnet block 7 corresponding to the first magnet block 4, and the second magnet block 7 is fixed on the side wall of the outer ring of the bearing 2 through a second bolt 10; the second magnet block 7 is attached to the side wall of the outer ring of the bearing 2; the second magnet blocks 7 and the first magnet blocks 4 are in one group, and are in a plurality of groups, each group of magnet blocks is in two, and the two magnet blocks are positioned between the bearing 2 and the bearing rear cover 11; when the wind speed is less than 8m/s, the front and rear magnet blocks transmit axial force to the bearing front cover 6 through the bearing 2 by mutually repulsive force, so that the bearing front cover 6 bears a part of the axial force. The two magnets are mutually exclusive and serve as a main unloading means, and the two magnets do not need to be in contact with each other, so that heat and friction loss caused by friction are avoided, and maintenance cost is reduced.

In another embodiment of the present application, the first bolts 3 are spring bolts, the spring bolts fix the first magnet blocks 4 on the bearing rear cover 11, and a certain gap exists between the first magnet blocks 4 and the bearing rear cover 11, the two first bolts 3 fix the first magnet blocks 4, when the wind speed is greater than 8m/s and less than 10m/s, the buffer springs between the first magnet blocks 4 and the bearing rear cover 11 also participate in the work of bearing the axial force, so that the buffer springs can further share the axial force through the elasticity, so that the device can bear more axial force, and the service life of the bearing is prolonged.

In another embodiment of the application, two first counter bores are machined on the first magnet block 4, two second counter bores are machined on the second magnet block 7, the first magnet block 4 is mounted on the bearing rear cover 11 after the first bolt 3 is inserted into the first counter bores, the second magnet block 7 is mounted on the outer ring side wall of the bearing 2 after the second bolt 10 is inserted into the second counter bores, and the counter bores can ensure the flatness of the mounting surface.

In another embodiment of the application, the number of the first magnet blocks 4 and the second magnet blocks 7 is 18, and the axial counter-thrust of 100kN and 25kN can be provided respectively. When the wind speed is less than or equal to 8m/s, the axial force generated by the wind wheel is completely borne by the magnet blocks, when the wind speed is more than 8m/s and less than 10m/s, the magnet block group and the spring bolt bear the axial force together, the main shaft cannot displace, and the rear bearing cannot bear the axial force. The front bearing life may reach 95000 hours (about 10.8 years) with an axial load of 125kN at maximum. When the wind speed is greater than 10m/s, the magnet block group and the spring bolt bear 125kN of axial force, and the rest of axial force is borne by the rear bearing, so that the abrasion of the roller and the outer ring is greatly reduced, the service life of the bearing is prolonged, and the larger production cost caused by the replacement of the bearing after the lifting and lowering of the tower due to the backward displacement of the main shaft system caused by overlarge abrasion of the bearing is saved.

Compared with the traditional structure that the unloading device is arranged on the outer ring of the floating bearing, the unloading device provided by the application has the advantages that the unloading force transmission path passes through the inner ring and the outer ring of the bearing, the magnetic unloading device is arranged on the inner ring of the bearing, and the unloading path does not pass through the inside of the bearing, so that the service life of the floating bearing is prolonged. The force transmission paths of the present application and the prior art are shown in fig. 2 (prior art on the left and present application on the right).

In another embodiment of the present application, a positioning ring 8 is disposed between the bearing front cover 6 and the bearing 2, an adjusting pad 9 is disposed between the positioning ring 8 and the bearing 2, the adjusting pad 9 is attached to the outer ring side wall of the bearing 2, and two sides of the positioning ring 8 are attached to the adjusting pad 9 and the surface of the bearing front cover 6, respectively.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The device for preventing the backward movement of the main shaft system of the wind turbine is characterized in that: the motor main shaft (1) is provided with a bearing (2);

a bearing front cover (6) is arranged on one side, close to the motor group, of the bearing (2), and a bearing rear cover (11) is arranged on one side, far away from the motor group, of the bearing (2);

the bearing rear cover (11) is provided with a plurality of first magnet blocks (4) on the end face close to the bearing (2), and a second magnet block (7) corresponding to the first magnet blocks (4) is fixed on the end face of the bearing (2) close to the bearing rear cover (11).

2. The device for restricting the backward movement of a main shaft system of a wind turbine according to claim 1, wherein: the first magnet block (4) is fixed on the back bearing cover through a first bolt (3).

3. Device for throttling back a main shaft system of a wind turbine according to claim 1 or 2, characterized in that: the second magnet block (7) is fixed on the bearing (2) through a second bolt (10).

4. A device for throttling back of a main shaft system of a wind turbine according to claim 3, wherein: two first counter bores are machined in the first magnet block (4).

5. The device for restricting the backward movement of a main shaft system of a wind turbine according to claim 4, wherein: two second counter bores are processed on the second magnet block (7).

6. The device for restricting the backward movement of a main shaft system of a wind turbine according to claim 2, wherein: the first bolt (3) is a spring bolt.

7. The device for restricting the backward movement of a main shaft system of a wind turbine according to claim 1, wherein: the bearing (2) is a self-aligning roller bearing.

8. The device for restricting the backward movement of a main shaft system of a wind turbine according to claim 1, wherein: the number of the first magnet blocks (4) is 18.

9. The device for restricting the backward movement of a main shaft system of a wind turbine according to claim 1, wherein: a positioning ring (8) is arranged between the bearing front cover (6) and the bearing (2).

10. The apparatus for throttling back of a wind turbine main shaft system according to claim 9, wherein: an adjusting pad (9) is arranged between the positioning ring (8) and the bearing (2).