CN216741844U

CN216741844U - Device for preventing wind turbine generator system main shaft system from moving backwards

Info

Publication number: CN216741844U
Application number: CN202220094168.3U
Authority: CN
Inventors: 李国庆; 康乐; 彭顺峰; 石宇; 陶永刚; 何源; 杨成龙; 赵禹茗
Original assignee: State Power Electric Power Inner Mongolia New Energy Development Co ltd
Current assignee: State Power Electric Power Inner Mongolia New Energy Development Co ltd
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2022-06-14
Anticipated expiration: 2032-01-14

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 generator from moving backwards. The positioning device comprises a limiting ring, wherein an installation groove is formed in one axial side of the limiting ring, and a positioning column is installed in the installation groove; the positioning column is sleeved with a limiting stop sleeve, the limiting stop sleeve is in sliding fit with the positioning column, and the limiting stop sleeve is in clearance fit with the mounting groove; an elastic component is arranged between the limiting stop sleeve and the bottom of the mounting groove; one side of the limiting blocking sleeve, which is far away from the limiting ring, protrudes from the mounting groove. The axial force borne by the rear bearing 530 can be greatly reduced, and the abrasion loss between the roller and the outer ring of the rear bearing is further reduced, so that the service life of the bearing is prolonged, and the large production cost caused by hoisting, lowering and replacing the rear bearing by the rear bearing due to the backward movement of the main shaft system caused by excessive abrasion of the bearing is saved.

Description

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

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 generator from moving backwards.

Background

The whole design technology of the wind generating set is gradually searched and advanced in the last 30 years, the main stream machine type capacity of the whole wind power industry is still 1.5MW before 10 years, most of the 1.5MW unit main shaft systems put into operation on the market before 10 years show backward movement faults of the main shaft systems, and many new energy operators have to select to hoist the main shaft systems of the wind generating set down to the tower to replace the new main shaft systems when facing the faults, so that high hoisting cost is spent, high cost of main shaft system spare parts is spent, the wind generating set needs to be stopped during hoisting, and the generating capacity of the whole wind power plant is influenced.

At present, a main shaft system of a large batch of wind turbine generators in the market adopts the layout configuration of two double-row self-aligning roller bearings, and at the beginning of design, the double-row rollers are simultaneously loaded under the condition that the bearings obtain ideal sufficient lubrication during use in the bearing service life calculation process, so that the service life of 20 years can be met. In practical application, however, each wind field has different maintenance levels and responsibility centers for the operation of the fan, and many bearings cannot reach a service environment with sufficient lubrication, and it is known through stress analysis aiming at the double-row self-aligning roller bearing that when subjected to an axial force, only the rear row rollers of the double-row self-aligning roller bearing are stressed, and the front row rollers are hardly subjected to the axial force, so that the double-row self-aligning roller bearing is used under the conditions of insufficient lubrication and stress of the single row rollers, and when the service environment is a wind farm, the wind load is suddenly changed, abrasion between the rear bearing rollers and the outer ring occurs over time, the abraded metal iron chips fall into the bearings, the bearings are not cleaned in time, the abrasion of the bearings is accelerated when the bearings continuously operate and are abraded in the operation process, the gap between the rear bearing rollers and the outer ring is increased after the abrasion is carried out for a long time, and when the main shaft system of the wind turbine unit bears the thrust force from the wind wheel again, that is the axial force, because this clearance is increased, the entire shaft system generates a backward movement phenomenon.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem of backward movement of a shaft main shaft system of a wind turbine generator, the application provides a device for controlling the backward movement of the shaft main shaft system of the wind turbine generator, and the device is arranged on a front bearing, so that the front bearing bears a part of axial force, the total axial force borne by the wind turbine generator is changed, the axial force borne by a rear bearing is reduced, and the abrasion borne by the rear bearing due to the overlarge axial force is relieved.

The technical scheme adopted by the utility model is that the device for controlling the backward movement of the main shaft system of the wind turbine generator comprises a limiting ring, wherein an installation groove is formed in one axial side of the limiting ring, and a positioning column is installed in the installation groove; the positioning column is sleeved with a limiting stop sleeve, the limiting stop sleeve is in sliding fit with the positioning column, and the limiting stop sleeve is in clearance fit with the mounting groove; an elastic component is arranged between the limiting stop sleeve and the bottom of the mounting groove; one side of the limiting blocking sleeve, which is far away from the limiting ring, protrudes from the mounting groove.

Further, the elastic part is a compression spring, and the inner diameter of the compression spring is matched with the positioning column.

Furthermore, a limiting check ring is arranged between the compression spring and the bottom of the mounting groove.

Furthermore, the positioning column is a cylindrical pin.

Furthermore, the end part of the positioning column is processed into a circular truncated cone shape.

Furthermore, the axial thickness of the limiting blocking sleeve and the length of the compressed spring are greater than the length of the positioning column above the bottom surface of the limiting groove.

Further, the mounting groove is a circular groove processed in the circumferential distribution of the limiting ring.

Further, the mounting groove is an annular groove machined in the circumferential direction of the limiting ring.

Furthermore, the limiting ring is an open-type limiting ring.

Furthermore, the limiting ring consists of two C-shaped limiting half rings.

Compared with the prior art, the utility model has the beneficial effects that: on the existing 1.5MW running unit, the improvement of the technical scheme is carried out aiming at the unit which just generates the backward movement phenomenon of the main shaft system or the unit which does not generate the backward movement phenomenon of the main shaft system, so that the axial force borne by the rear bearing 530 can be greatly reduced, and the abrasion loss between the roller and the outer ring is further reduced, thereby prolonging the service life of the bearing, and saving the larger production cost caused by the backward movement of the main shaft system due to the excessive abrasion of the bearing and the replacement of the rear bearing after the hoisting and the tower unloading.

Drawings

FIG. 1 is a diagram of a main shaft system of a unit in which a backward movement failure of the main shaft system occurs;

FIG. 2 is a schematic structural diagram of a device for restraining the backward movement of a main shaft system of a wind turbine generator set according to the present invention;

wherein: the device comprises a limiting ring 1, a mounting groove 110, a positioning column 2, a limiting blocking sleeve 3, an elastic part 4 and a limiting blocking ring 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, it is a structure diagram of a main shaft system of a unit in which a back-moving failure of the main shaft system occurs, the front bearing is selected as SKF670, the back bearing is selected as SKF530, the front bearing 670 is designed as a floating bearing to bear the radial force borne by the main shaft system, because the front bearing is designed as floating in the axial direction, the bearing does not bear the axial force, the back bearing 530 has structural limitations in both the axial direction and the radial direction with its bearing seat when installed, and therefore the back bearing 530 bears the axial force and the radial force of the main shaft system when the unit is in operation.

As shown in fig. 2, the device for preventing the wind turbine main shaft system from moving backwards includes a limiting ring 1, a limiting blocking sleeve 3, an elastic component 4 and a positioning column 2.

An installation groove 110 is formed in one axial side of the limiting ring 1, and a positioning column 2 is installed in the installation groove 110; a limiting stop sleeve 3 is sleeved on the positioning column 2, the limiting stop sleeve 3 is in sliding fit with the positioning column 2, and the limiting stop sleeve 3 is in clearance fit with the mounting groove 110; an elastic component 4 is arranged between the limiting blocking sleeve 3 and the bottom of the mounting groove 110; the side of the spacing block sleeve 3 far away from the spacing ring 1 protrudes from the mounting groove 110.

The device is installed in front bearing (SKF670) outer lane for the outer lane is no longer floated, and spacing ring 1 and the direct laminating installation of front bearing outer lane, axial force transmission route are that the front bearing inner circle passes through the roller transmission and transmits the outer lane, and the outer lane passes through spacing ring 1, spacing retaining sleeve 3, elastomeric element 4 transmission and transmits for front bearing frame rear end cap.

In one embodiment of the present invention, the elastic member 4 is a compression spring, and the inner diameter of the compression spring is matched with the positioning column 2.

The axial size (axial width) of the limiting stop sleeve 3 and the limiting half ring 1 is fixed so as to meet the requirement of different distances between the front bearing outer ring and the end cover of the unit after operation, when the compression springs are designed and selected, the compression springs are uniformly distributed on each compression spring according to the total stress of the axial force capable of being born in the rated service life of the front bearing SKF670 and the circumferential quantity, the compression amount of the compression springs is designed according to the selection design of the compression springs according to the shared axial force, so that when the actual compression amount is exceeded, the device does not bear the axial force any more, and the redundant axial force is borne by the rear bearing SKF 530.

As an embodiment of the utility model, a limit retainer ring 5 is arranged between the compression spring and the bottom of the mounting groove 110, one axial side of the limit retainer ring is attached to the bottom of the mounting groove 110, and the other end of the limit retainer ring is attached to the compression spring; the device is installed in front bearing (SKF670) outer lane for the outer lane is no longer floated, and the spacer ring is installed with the direct laminating of front bearing outer lane, and axial force transmission route is that the front bearing inner circle passes through the roller transmission and transmits the outer lane, and the outer lane passes through spacer ring 1, spacing retaining ring 3, spacing retaining ring 5, elastomeric element 4 transmission and transmits for front bearing frame rear end cap.

During the use, dismantle SKF670 bearing frame rear end cover, at first install spacing ring 1 in SKF670 bearing rear end face, make its complete contact, install spacing retaining sleeve 3 and the compression spring of circumference equipartition on spacing ring 11, use spacing retaining ring 5 adjustment end cover and bearing inner race distance for the size after the device installation is for surpassing the end cover distance for S, distance S is the design value of the compression of n compression springs of circumference distribution, use the end cover to compress tightly the device, fix it on SKF670 bearing frame through the bolt. After the rear moving device of the shafting of the wind turbine generator is installed, partial axial force is borne by the rear bearing SKF530, the axial force borne is within the range of 0-50kN through calculation, the axial force borne by the rear bearing is effectively shared, the abrasion of the axial force borne by the shafting to the SKF530 bearing is reduced, the abrasion of the SKF530 bearing is reduced, and the service life of the whole shafting is prolonged.

As an embodiment of the present invention, the positioning column 2 is a cylindrical pin; the end of the cylindrical pin is processed into a circular truncated cone shape.

As an embodiment of the present invention, the length of the limiting blocking sleeve 3 after the axial thickness and the compression of the compression spring is greater than the length of the positioning column 2 above the bottom of the limiting groove.

As an embodiment of the present invention, the mounting groove 110 is a circular groove formed in the circumferential direction of the stop ring. Or the mounting groove 110 is an annular groove machined in the circumferential direction of the limiting ring.

As an embodiment of the utility model, the limiting ring 1 is an open-type limiting ring, so that the limiting ring 1 is conveniently sleeved on the main shaft, and two ends of the opening are connected and locked by a fixing bolt.

As an embodiment of the utility model, the limiting ring 11 is composed of two C-shaped limiting half rings, so that the installation is convenient, and the two C-shaped limiting half rings are connected together through a fixing bolt after being installed, so as to play a limiting role.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a device that choke wind turbine generator system main shaft system moves back which characterized in that: the positioning device comprises a limiting ring, wherein an installation groove is formed in one axial side of the limiting ring, and a positioning column is installed in the installation groove; the positioning column is sleeved with a limiting baffle sleeve, the limiting baffle sleeve is in sliding fit with the positioning column, and the limiting baffle sleeve is in clearance fit with the mounting groove; an elastic component is arranged between the limiting stop sleeve and the bottom of the mounting groove; one side of the limiting blocking sleeve, which is far away from the limiting ring, protrudes from the mounting groove.

2. The device for throttling wind turbine generator main shaft system backward movement according to claim 1, characterized in that: the elastic component is a compression spring, and the inner diameter of the compression spring is matched with the positioning column.

3. The device for throttling wind turbine generator main shaft system backward movement according to claim 2, characterized in that: and a limiting check ring is arranged between the compression spring and the bottom of the mounting groove.

4. The device for throttling wind turbine generator main shaft system backward movement according to claim 1, characterized in that: the positioning column is a cylindrical pin.

5. The device for throttling wind turbine generator main shaft system backward movement according to claim 4, characterized in that: the end part of the positioning column is processed into a circular truncated cone shape.

6. The device for throttling the backward movement of a main shaft system of a wind turbine generator according to claim 2, characterized in that: the axial thickness of the limiting blocking sleeve and the length of the compressed spring are larger than the length of the positioning column above the bottom surface of the limiting groove.

7. The device for throttling wind turbine generator main shaft system backward movement according to claim 1, characterized in that: the mounting groove is a circular groove which is processed and distributed in the circumferential direction of the limiting ring.

8. The device for throttling wind turbine generator main shaft system backward movement according to claim 1, characterized in that: the mounting groove is an annular groove machined in the circumferential direction of the limiting ring.

9. The device for throttling wind turbine generator main shaft system backward movement according to claim 1, characterized in that: the limiting ring is an open type limiting ring.

10. The device for throttling the backward movement of a main shaft system of a wind turbine generator according to claim 1, wherein: the limiting ring consists of two C-shaped limiting half rings.