CN215890312U

CN215890312U - Pitch bearing bolt connecting system of wind generating set

Info

Publication number: CN215890312U
Application number: CN202122592310.5U
Authority: CN
Inventors: 赵琦伟; 冯煜
Original assignee: CSIC Haizhuang Windpower Co Ltd
Current assignee: CSIC Haizhuang Windpower Co Ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-02-22
Anticipated expiration: 2031-10-27

Abstract

The utility model provides a bolt connecting system for a variable-pitch bearing of a wind generating set, which comprises a hub, blades, a variable-pitch bearing, a stud, a sleeve and a customized nut, wherein the hub is connected with an inner ring of the variable-pitch bearing through a flange, a blade root of each blade is connected with an outer ring of the variable-pitch bearing, a first threaded hole is formed in the hub, a second mounting hole is formed in the variable-pitch bearing, one end of the stud is screwed in the first threaded hole, the other end of the stud penetrates through the second mounting hole and the sleeve and then is fastened through the customized nut, the sleeve is sleeved on the stud, and the outer diameter of the sleeve is larger than the aperture of the second mounting hole. The utility model can improve the fatigue property of the bolt connection system of the variable pitch bearing, has the function of thread anti-loosening, achieves the aim of less maintenance and even no maintenance, improves the reliability of the bolt connection system of the variable pitch bearing and ensures the safe operation of the unit.

Description

Pitch bearing bolt connecting system of wind generating set

Technical Field

The utility model relates to the technical field of wind power generation, in particular to a variable-pitch bearing bolt connecting system of a wind generating set.

Background

The wind turbine generator system has the advantages that the wind turbine generator system is severe in operating environment and complex in working condition, wind load has certain instability and randomness, the variable pitch bearing serves as a heavy component for connecting a blade and a hub of the wind turbine generator system, the inner ring and the outer ring of the variable pitch bearing are connected with the blade and the hub respectively through the bolt connecting pairs, the bolt connecting system of the variable pitch bearing bears large alternating load, and the alternating load frequency is high.

Along with the wind turbine generator blades are longer and longer, the generator power is larger and larger, the load borne by the variable-pitch bearing bolt connecting system is larger and larger, but the safety margin of the variable-pitch bearing bolt connecting system is smaller and smaller relatively under the limit of the processing and manufacturing capacity of the variable-pitch bearing, the structural size of the whole machine system and the cost of the whole machine. Therefore, the requirements for the fine design of a variable-pitch bearing bolt connecting system and the on-site bolt installation are higher and higher, if the design and installation defects exist, the problem of fatigue failure of the variable-pitch bearing bolt is easily caused, and the safe operation of the unit is threatened.

SUMMERY OF THE UTILITY MODEL

In view of this, the problem to be solved by the present invention is to provide a pitch bearing bolt connection system of a wind turbine generator system, which improves the fatigue characteristics of the pitch bearing bolt connection system, has a thread anti-loosening function, achieves the purpose of less maintenance or even no maintenance, improves the reliability of the pitch bearing bolt connection system, and ensures the safe operation of the wind turbine generator system.

The utility model solves the technical problems by the following technical means: the utility model provides a bolt connecting system for a variable-pitch bearing of a wind generating set, which comprises a hub, blades, a variable-pitch bearing, a stud, a sleeve and a customized nut, wherein the hub is connected with an inner ring of the variable-pitch bearing through a flange, a blade root of each blade is connected with an outer ring of the variable-pitch bearing, a first threaded hole is formed in the hub, a second mounting hole is formed in the variable-pitch bearing, one end of the stud is screwed in the first threaded hole in a threaded manner, the other end of the stud penetrates through the second mounting hole and the sleeve and then is fastened through the customized nut, the sleeve is sleeved on the stud, and the outer diameter of the sleeve is larger than the aperture of the second mounting hole.

Further, the diameter of the polished rod part of the double-end stud is set to be a small thread diameter, the thread is a standard common thread, the customized nut is set to be a variable-pitch nut, and the pitch of each circle of the thread of the customized nut is changed at equal intervals.

Furthermore, an inner hexagonal hole is formed in the end face of one end, connected with the customized nut, of the stud.

Further, the sleeve is subjected to modulation treatment, and the hardness grade of the sleeve is not less than 300 HV.

Furthermore, a first positioning hole is formed in the outer ring of the variable-pitch bearing, a second positioning hole which corresponds to the first positioning hole in a one-to-one mode is formed in the blade root, the first positioning hole and the second positioning hole are positioned through a positioning pin, two ends of the positioning pin are arranged to be conical, and the first positioning hole and the second positioning hole are arranged to be conical holes which are matched with two ends of the positioning pin in a radial direction.

Furthermore, two or more first locating holes are formed in the outer ring, the first locating holes are arranged along the circumferential array of the outer ring, and the first locating holes are formed in the inner side or the outer side of the mounting hole in the outer ring.

According to the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model provides a bolt connecting system for a variable-pitch bearing of a wind generating set, which comprises a hub, blades, a variable-pitch bearing, a stud, a sleeve and a customized nut, wherein the hub is connected with an inner ring of the variable-pitch bearing, a blade root of each blade is connected with an outer ring of the variable-pitch bearing, a first threaded hole is formed in the hub, a second mounting hole is formed in the variable-pitch bearing, one end of the stud is screwed in the first threaded hole in a threaded manner, the other end of the stud penetrates through the second mounting hole and the sleeve and then is fastened through the customized nut, the sleeve is sleeved on the stud, and the outer diameter of the sleeve is larger than the aperture of the second mounting hole. This use is novel can improve the fatigue characteristic of becoming oar bearing bolted connection system, and possesses the locking function of screw thread, reaches the purpose of few maintenance or even non-maintaining, improves the reliability of becoming oar bearing bolted connection system, ensures the safe operation of unit.

Drawings

In order to more clearly illustrate the detailed description of the utility model or the technical solutions in the prior art, the drawings that are needed in the detailed description of the utility model or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic view of a wind generating set pitch bearing bolting system of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at position A;

reference numerals:

1-a hub; 2-a blade; 3-a pitch bearing; 4-a stud; 5-a sleeve; 6, customizing a nut; 11-a first threaded hole; 31-a second mounting hole; 32-a first locating hole; 21-a second positioning hole; 33-inner ring; 34-outer ring.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

Referring to fig. 1-2, the utility model provides a pitch bearing bolt connection system of a wind generating set, which includes a hub 1, a blade 2, a pitch bearing 3, a stud 4, a sleeve 5 and a customized nut 6, wherein the hub 1 is connected with an inner ring 33 of the pitch bearing 3, a blade root of the blade 2 is connected with an outer ring 34 of the pitch bearing 3, the hub 1 is provided with a first threaded hole 11, the pitch bearing 3 is provided with a second mounting hole 31, one end of the stud 4 is screwed in the first threaded hole 11, the other end of the stud 4 penetrates through the second mounting hole 31 and the sleeve 5 and then is fastened through the customized nut 6, the sleeve 5 is sleeved on the stud, and the outer diameter of the sleeve 5 is larger than the aperture of the second mounting hole 31. The diameter of the polished rod part of the double-end stud 4 is set to be a small thread diameter, the thread is a standard common thread, the customized nut 6 is set to be a variable-pitch nut, and the pitch of each circle of the thread of the customized nut 6 is changed at equal intervals.

The lengthened double-end stud 4 is adopted to increase the flexibility of the bolt, and meanwhile, the diameter of the polished rod part of the stud is equal to the small diameter of the thread, so that the flexibility of the stud is further improved; meanwhile, the sleeve 5 is adopted to increase the rigidity of the connected structure; adopt variable pitch nut and stud 4 cooperation, because the increase of nut screw thread pitch, guarantee the pretension of nut more easily at the in-process of tensile pretension nut to can guarantee that the vice pretightning force of bolted connection satisfies the designing requirement, each circle screw thread of the vice threaded connection of while under the pretightning force effect bears the load and the thread deflection is more even, and fatigue characteristic is showing the reinforcing. The fatigue strength of a bolt connecting system of the variable pitch bearing 3 is integrally enhanced, the fatigue failure of the bolt connecting system caused by alternating stress in a complex and severe working condition environment is avoided, and the safe and stable operation of the wind turbine generator is ensured; after the variable-pitch nut is adopted, under the continuous action of an external load, the residual pretightening force between the threaded connection pair is larger, the micro-sliding amount is smaller, the looseness prevention of the threaded connection pair is facilitated, and the purposes of less maintenance and even no maintenance are achieved.

As a further improvement of the above embodiment, the end face of the end of the stud bolt 4 to which the custom nut 6 is connected is provided with a hexagonal socket. The head of one end face of the stud is provided with an inner hexagon, so that the stud can be conveniently screwed in during the installation on site; the stud is pre-tightened by a stretcher, so that the tightening coefficient of the pre-tightening force of the stud is further reduced, and the dispersion of the pre-tightening force is reduced. The sleeve 5 is subjected to a conditioning treatment, and the hardness grade of the sleeve 5 is not less than 300 HV.

As a further improvement of the above embodiment, a first positioning hole 32 is provided on an outer ring 34 of the pitch bearing 3, a second positioning hole 21 corresponding to the first positioning hole 32 one to one is provided on the blade root, the first positioning hole 32 and the second positioning hole 21 are positioned by a positioning pin, two ends of the positioning pin are tapered, and the first positioning hole 32 and the second positioning hole 21 are tapered holes matched with two ends of the positioning pin. Through setting up corresponding first locating hole 32 and second locating hole 21, when carrying out the installation of blade 2, at first insert the locating pin in first locating hole 32, carry out the location of blade 2 through the locating pin, the quantity of locating pin is less than the quantity of blade 2 installation screw rod, fixes a position easier when the installation, and preferably, the length of the section of stretching out of locating pin is greater than the length of the section of stretching out of screw rod to set up the degree of depth of second locating hole 21 and be greater than the length of the section of stretching out of locating pin.

As a further modification of the above embodiment, the number of the first positioning holes 32 is not less than two, the first positioning holes 32 are arranged in a circumferential array along the outer ring 34, and the first positioning holes 32 are arranged inside or outside the mounting holes on the outer ring 34. The provision of two or three locating pins facilitates the locating mounting of the blade 2.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims

1. The utility model provides a wind generating set becomes oar bearing bolted connection system which characterized in that: including wheel hub (1), blade (2), become oar bearing (3), stud (4), sleeve (5) and custom nut (6), wheel hub (1) is connected with inner circle (33) of becoming oar bearing (3), the blade root of blade (2) is connected with outer lane (34) of becoming oar bearing (3), be provided with first screw hole (11) on the wheel hub, it is provided with second mounting hole (31) on the oar bearing (3) to become, the one end screw tightening of stud (4) is in first screw hole (11), the other end of stud (4) is through fastening through custom nut (6) behind second mounting hole (31) and sleeve (5), sleeve (5) cover is established on stud, the external diameter of sleeve (5) is greater than the aperture of second mounting hole (31).

2. The wind generating set pitch bearing bolting system of claim 1, wherein: the diameter of the polished rod part of the double-end stud (4) is set to be a small thread diameter, the thread is a standard common thread, the customized nut (6) is set to be a variable-pitch nut, and the pitch of each circle of thread of the customized nut (6) is changed at equal intervals.

3. The wind generating set pitch bearing bolting system of claim 2, wherein: and the end surface of one end of the stud (4) connected with the custom nut (6) is provided with a hexagon socket.

4. The wind generating set pitch bearing bolting system of claim 3, wherein: the sleeve (5) is subjected to modulation treatment, and the hardness grade of the sleeve (5) is not less than 300 HV.

5. The wind generating set pitch bearing bolting system of claim 1, wherein: the blade root positioning structure is characterized in that a first positioning hole (32) is formed in an outer ring (34) of the variable pitch bearing (3), a second positioning hole (21) corresponding to the first positioning hole (32) in a one-to-one mode is formed in the blade root, the first positioning hole (32) and the second positioning hole (21) are positioned through a positioning pin, two ends of the positioning pin are arranged to be conical, and the first positioning hole (32) and the second positioning hole (21) are arranged to be conical holes matched with two ends of the positioning pin.

6. The wind generating set pitch bearing bolting system of claim 5, wherein: the number of the first positioning holes (32) is not less than two, the first positioning holes (32) are arranged along the circumferential array of the outer ring (34), and the first positioning holes (32) are arranged on the inner side or the outer side of the mounting hole in the outer ring (34).