阅读说明：本技术 风电机组中轮毂和主轴连接结构及连接方法 (Hub and main shaft connecting structure and connecting method in wind turbine generator ) 是由 朱少辉 王晓东 薛晓云 王岳峰 宁文钢 李达 王书勇 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种风电机组中轮毂和主轴连接结构及连接方法,包括多个螺柱,每个螺柱的两端分别设有第一螺纹部和第二螺纹部,每个螺柱的中部设有第三螺纹部,轮毂法兰端面设有多个通孔,每个通孔具有螺纹段和光孔段,每个通孔的螺纹段安装有工装螺母,工装螺母的外周面设有与通孔的螺纹段匹配的外螺纹,工装螺母的内周面设有与螺柱中部的第三螺纹部匹配的内螺纹,螺柱具有第一螺纹部的一端旋入轮毂法兰端面的通孔,并与轮毂法兰固定连接,螺柱具有第二螺纹部的一端旋入主轴法兰端面设置的主轴法兰螺柱孔,并与主轴法兰固定连接,从而将轮毂和主轴进行固定。本发明结构简单,连接方便,减轻主轴长度和重量,降低主轴加工成本。(The invention discloses a hub and main shaft connecting structure in a wind turbine generator and a connecting method, the connecting structure comprises a plurality of studs, a first thread part and a second thread part are respectively arranged at two ends of each stud, a third thread part is arranged in the middle of each stud, a plurality of through holes are arranged on the end surface of a hub flange, each through hole is provided with a thread section and a unthreaded hole section, a tool nut is arranged on the thread section of each through hole, an external thread matched with the thread section of the through hole is arranged on the outer peripheral surface of the tool nut, an internal thread matched with the third thread part in the middle of the stud is arranged on the inner peripheral surface of the tool nut, one end of each stud with the first thread part is screwed into the through hole on the end surface of the hub flange, and the end of the stud with the second thread part is screwed into a stud hole of the spindle flange arranged on the end face of the spindle flange and is fixedly connected with the spindle flange, so that the hub and the spindle are fixed. The invention has simple structure and convenient connection, reduces the length and the weight of the main shaft and reduces the processing cost of the main shaft.)

1. A connection structure of a hub and a main shaft in a wind turbine generator comprises a hub flange and a main shaft flange which are respectively arranged on a hub end face and a main shaft end face, wherein the end face of one side of the main shaft flange is connected with the hub flange, the end face of the other side of the main shaft flange is laminated with a locking disc which is sleeved on the main shaft, the connection structure is characterized by further comprising a plurality of studs, a first thread part and a second thread part are respectively arranged at two ends of each stud, a third thread part is arranged in the middle of each stud, a plurality of through holes are arranged on the end face of the hub flange, each through hole is provided with a thread section and a smooth hole section, the thread section of each through hole faces towards the main shaft, a tool nut is arranged on the thread section of each through hole, and an external thread matched with the thread section of each through hole is arranged on the outer peripheral face of the tool nut, the inner peripheral surface of the tooling nut is provided with internal threads matched with the third thread parts in the middle of the studs, the end surface of the spindle flange is provided with a plurality of spindle flange stud holes, the number of the spindle flange stud holes is equal to that of the hub flange through holes, each spindle flange stud hole is correspondingly matched with one hub flange through hole through one stud, a plurality of locking disc stud holes are arranged on the locking disc, and the number and the positions of the locking disc stud holes correspond to those of the spindle flange stud holes one by one;

the first screw thread portion of double-screw bolt screw in the through-hole of wheel hub flange terminal surface, by the screw thread portion screw in of through-hole is screwed out by the unthreaded hole section of through-hole, and the third screw thread portion of double-screw bolt with the internal thread of frock nut screws in the screw thread portion of through-hole, the first screw thread portion of double-screw bolt is screwed through the first nut rather than the matching and is connected, the second screw thread portion screw in of double-screw bolt spindle flange stud hole on the spindle flange terminal surface, by lock dish screw hole is screwed out, and the second screw thread portion of double-screw bolt is screwed through the second nut rather than the matching and is connected.

2. The connection structure of the hub and the spindle in the wind turbine generator set according to claim 1, wherein the tooling nut is a thin nut, the length of the tooling nut screwed with the stud is short, and the height of the tooling nut is smaller than the depth of the thread section of the through hole.

3. The connection structure of the hub and the main shaft in the wind turbine generator set according to claim 1, wherein two end faces of the stud are respectively provided with a counter bore.

4. The connection structure of the hub and the main shaft in the wind turbine generator set according to claim 1, wherein the tooling nut can be replaced by an expansion sleeve.

5. The method for connecting a hub and a main shaft connecting structure in a wind turbine generator set according to any one of claims 1 to 4, characterized by comprising the steps of:

s1: sequentially screwing and fixing a plurality of tool nuts on the thread section of the through hole of the hub flange;

s2: sequentially screwing first threaded parts of the studs into through holes of the hub flange, screwing the first threaded parts into the through holes, screwing out the first threaded parts out of unthreaded hole sections of the through holes, screwing a third threaded part of each stud with internal threads of a tooling nut in the threaded section of the through hole, and screwing and connecting the first threaded part of each stud with a first nut matched with the first threaded part;

s3: the hub and the studs fixed on the hub flange are lifted as a whole, the second thread parts of the studs are sequentially screwed into the stud holes of the spindle flange and screwed out of the stud holes of the locking disc, and the second thread part of each stud is screwed and connected through a second nut matched with the second thread part.

Technical Field

The invention belongs to the technical field of wind power equipment, and particularly relates to a connection structure and a connection method of a hub and a main shaft in a wind turbine generator.

Background

Basically, the wind turbine generator system on the land is integrally hoisted by wind wheels, namely, the wind wheels 1 are assembled on the ground, and then the wind wheels 1 are hoisted to be connected with the engine room 2. The method for connecting the wind wheel 1 and the nacelle 2 comprises the following steps: a hub 1.1 in a wind wheel 1 and a connecting stud 2.2 of a main shaft 2.1 in a cabin 2 are arranged in a blind hole of the hub 1.1, and in order to meet the overhaul and replacement of the connecting stud 2.2, an axial space needs to be reserved among the main shaft 2.1, a locking disc 2.3 and a bearing seat assembly 2.4, so that the length of a flange neck 2.5 is increased, the length and the weight of the main shaft 2.1 are increased, the production cost of the main shaft 2.1 is also increased, and the bearing of a main transmission chain is deteriorated due to the increase of the length of a cantilever of the main shaft 2.1; the other method comprises the following steps: by increasing the pitch circle diameter of the connecting stud 2.2, the connecting stud 2.2 radially avoids the bearing seat assembly 2.4, but this also increases the structural weight.

Disclosure of Invention

In order to solve the above problems in the prior art, one aspect of the present invention provides a hub and spindle connection structure in a wind turbine, including a hub flange and a spindle flange respectively disposed on an end surface of the hub and an end surface of the spindle, wherein an end surface of one side of the spindle flange is connected to the hub flange, and an end surface of the other side of the spindle flange is attached to a locking disk sleeved on the spindle, the hub and spindle connection structure in the wind turbine further includes a plurality of studs, two ends of each stud are respectively provided with a first threaded portion and a second threaded portion, a third threaded portion is disposed in the middle of each stud, the end surface of the hub flange is provided with a plurality of through holes, each through hole has a threaded portion and a unthreaded hole portion, the threaded portion of each through hole faces the spindle, a tooling nut is mounted on the threaded portion of each through hole, an outer circumferential surface of the tooling nut is provided with an external thread matching the threaded portion of the through hole, the inner peripheral surface of the tooling nut is provided with internal threads matched with the third thread parts in the middle of the studs, the end surface of the spindle flange is provided with a plurality of spindle flange stud holes, the number of the spindle flange stud holes is equal to that of the hub flange through holes, each spindle flange stud hole is correspondingly matched with one hub flange through hole through one stud, a plurality of locking disc stud holes are arranged on the locking disc, and the number and the positions of the locking disc stud holes correspond to those of the spindle flange stud holes one by one;

the first screw thread portion of double-screw bolt screw in the through-hole of wheel hub flange terminal surface, by the screw thread portion screw in of through-hole is screwed out by the unthreaded hole section of through-hole, and the third screw thread portion of double-screw bolt with the internal thread of frock nut screws in the screw thread portion of through-hole, the first screw thread portion of double-screw bolt is screwed through the first nut rather than the matching and is connected, the second screw thread portion screw in of double-screw bolt spindle flange stud hole on the spindle flange terminal surface, by lock dish screw hole is screwed out, and the second screw thread portion of double-screw bolt is screwed through the second nut rather than the matching and is connected.

Preferably, in the connection structure of the hub and the main shaft in the wind turbine generator, the tooling nut is a thin nut, the length of the tooling nut screwed with the stud is short, and the height of the tooling nut is smaller than the depth of the thread section in the through hole.

Preferably, in the connection structure of the hub and the main shaft in the wind turbine generator, two end faces of the stud are respectively provided with a counter bore.

Preferably, in the connection structure of the hub and the main shaft in the wind turbine generator, the tooling nut can be replaced by an expansion sleeve.

In order to solve the above problems in the prior art, in another aspect of the present invention, there is provided a method for connecting a hub and a main shaft connection structure in a wind turbine generator, the method including the steps of:

s1: sequentially screwing and fixing a plurality of tool nuts on the thread section of the through hole of the hub flange;

s2: sequentially screwing first threaded parts of the studs into through holes of the hub flange, screwing the first threaded parts into the through holes, screwing out the first threaded parts out of unthreaded hole sections of the through holes, screwing a third threaded part of each stud with internal threads of a tooling nut in the threaded section of the through hole, and screwing and connecting the first threaded part of each stud with a first nut matched with the first threaded part;

s3: the hub and the studs fixed on the hub flange are lifted as a whole, the second thread parts of the studs are sequentially screwed into the stud holes of the spindle flange and screwed out of the stud holes of the locking disc, and the second thread part of each stud is screwed and connected through a second nut matched with the second thread part.

The connecting structure of the hub and the main shaft in the wind turbine generator set is simple and convenient, when the stud needs to be overhauled or replaced, the stud can be taken out from the side of the hub, the flange neck of the main shaft does not need to reserve an overhauling or replacing space for the stud, the length and the weight of the main shaft are further reduced, the processing cost of the main shaft is reduced, and meanwhile, the tooling nut is matched with the stud by installing the tooling nut on the end face of the flange of the hub, so that the connecting stability of the stud and the hub is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of a prior art wind turbine and nacelle assembly.

Fig. 2 is a schematic view of the assembly of a hub and spindle of the prior art.

Fig. 3 is an enlarged view of section II in fig. 2.

FIG. 4 is an assembly view of the hub and main shaft connection structure of the wind turbine generator of the present invention.

Fig. 5 is an enlarged view of a portion I in fig. 4.

Fig. 6 is a schematic structural view of a through hole in the flange end face of the hub in the connection structure of the hub and the main shaft in the wind turbine generator set.

FIG. 7 is a schematic structural diagram of a stud in a connection structure of a hub and a main shaft in the wind turbine generator set.

Fig. 8 is a schematic structural view of a tool nut in a connection structure of a hub and a main shaft in a wind turbine generator according to the present invention.

Description of reference numerals: the structure of the wind wheel comprises a 1-wind wheel body, a 1.1-hub, a 2-cabin, a 2.1-spindle, a 2.2-connecting stud, a 2.3-locking disc, a 2.4-bearing seat assembly, a 2.5-flange neck, a 10-hub flange, a 10.1-unthreaded hole section, a 10.2-thread section, an 11-tooling nut, an 11.1-internal thread, an 11.2-external thread, an 11.3-mounting hole, a 12-first nut, a 20-spindle flange, a 21-second nut, a 30-locking disc, a 40-stud, a 41-first thread section, a 42-second thread section, a 43-third thread section and a 50-bearing seat assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The end surfaces of a hub and a main shaft in the wind generating set are respectively provided with a hub flange 10 and a main shaft flange 20, the end surface of one side of the main shaft flange 20 is used for connecting the hub flange 10, the end surface of the other side of the main shaft flange 20 is attached with a locking disc 30 sleeved on the main shaft and used for locking the main shaft, and a bearing seat assembly 50 is sleeved on the main shaft and used for supporting the main shaft.

As shown in fig. 4, 5, 6, 7 and 8, the connection structure of the hub and the spindle in the wind turbine generator set of the present invention includes studs 40, a tooling nut 11, a first nut 12 and a second nut 21, wherein a first threaded portion 41 and a second threaded portion 42 are respectively disposed at two ends of each stud 40, a third threaded portion 43 is disposed at a middle portion of each stud 40, a plurality of through holes are disposed on an end surface of a hub flange 10, each through hole has a threaded portion 10.2 and a smooth hole portion 10.1, the threaded portion 10.2 of each through hole faces the spindle, the tooling nut 11 is mounted in the threaded portion 10.2 of each through hole, an external thread 11.2 matching the threaded portion 10.2 of each through hole is disposed on an outer peripheral surface of each tooling nut 11, the tooling nut 11 is fixed to the threaded portion 10.2 of each through external thread 11.2, an internal thread 11.1 matching the third threaded portion 43 of the stud 40 is disposed on an inner peripheral surface of each tooling nut 11, a plurality of spindle flange stud holes are disposed on an end surface of a spindle flange 20, the number of the spindle flange stud holes is equal to the number of the through holes of the hub flanges and is equal to the number of the studs 40, each spindle flange stud hole is correspondingly matched with the through hole of one hub flange through one stud 40, a plurality of locking disc stud holes are arranged on the locking disc 30, and the number and the positions of the locking disc stud holes correspond to the number and the positions of the spindle flange stud holes one by one.

The first thread part 41 of the stud 40 is screwed into the through hole of the hub flange 10, screwed into the thread part 10.2 of the through hole and screwed out of the unthreaded hole section 10.1 of the through hole, the third thread part 43 of the stud 40 is screwed and connected with the internal thread 11.1 of the tool nut 11 in the thread part 10.2 of the through hole, the first thread part 41 of the stud 40 is fixedly connected with the first nut 12 matched with the first thread part 41, the second thread part 42 of the stud 40 is screwed into the spindle flange stud hole on the end face of the spindle flange 20 and screwed out of the locking disc stud hole, and the second thread part 42 of the stud 40 is fixedly connected with the second nut 21 matched with the second thread part.

In the connecting structure of the hub and the main shaft in the wind turbine generator, the tool nut 11 is a low-strength nut, such as a nylon material, the tool nut 11 plays an auxiliary connecting role before the stud 40 is pre-tightened, so that the stud 40 is stably fixed with the hub flange 10, and the tool nut 11 deforms or is damaged when the stud 40 is pre-tightened, so that the pre-tightening and the bearing of the stud 40 are not influenced.

As a specific implementation mode, the tooling nut 11 in the connecting structure of the hub and the main shaft in the wind turbine generator is a thin nut, the screwing length of the tooling nut and the stud 40 is short, the stud 40 can be conveniently taken out subsequently, and meanwhile, the height of the tooling nut 11 is smaller than the depth of a threaded section 10.2 of a through hole on the hub flange 10, so that the hub flange 10 and the main shaft flange 20 are completely attached.

Preferably, in the connection structure of the hub and the main shaft in the wind turbine generator, the end surface of the tooling nut 11 is provided with a mounting hole 11.3, so that the tooling nut 11 can be conveniently mounted to the threaded section 10.2 of the through hole of the hub flange 10.

Optionally, in the connection structure of the hub and the spindle in the wind turbine generator, the tool nut 11 may be replaced by an expansion sleeve, the outer periphery of the expansion sleeve is connected to the threaded section 10.2 in the through hole of the hub flange 10, and the inner periphery of the expansion sleeve is used for being connected to the third threaded section 43 of the stud 40.

Preferably, in the hub and main shaft connecting structure in the wind turbine generator according to the present invention, counterbores are provided at both ends of the stud 40, and further, the first threaded portion 41 and the third threaded portion 43 of the stud 40 may be combined into one threaded portion.

The connecting method of the hub and the main shaft connecting structure in the wind turbine generator set comprises the following steps:

s1: sequentially screwing and fixing a plurality of tool nuts 11 on the thread sections 10.2 of the through holes of the hub flange 10;

s2: sequentially screwing the first threaded parts 41 of the studs 40 into the through holes of the hub flange 10, screwing the first threaded parts into the through holes through the threaded sections 10.2 of the through holes, screwing the first threaded parts out of the unthreaded hole sections 10.1 of the through holes, screwing the third threaded part 43 of each stud 40 with the internal thread 11.1 of the tool nut 11 in the threaded section 10.2 of the through hole, and screwing the first threaded part 41 of each stud 40 with the first nut 12 matched with the first threaded part;

s3: the hub and the studs 40 fixed on the hub flange 10 are lifted as a whole, the second thread parts 42 of the studs 40 are sequentially screwed into the stud holes of the spindle flange and screwed out of the stud holes of the locking disc, and the second thread part 42 of each stud 40 is screwed and connected through the second nut 21 matched with the second thread part 42.

Therefore, through the connecting structure of the hub and the main shaft in the wind turbine generator, when the stud needs to be overhauled or replaced, the stud can be taken out from the side of the hub, the main shaft flange neck does not need to reserve an overhauling or replacing space for the stud, the length and the weight of the main shaft are further reduced, the machining cost of the main shaft is reduced, and meanwhile, the tooling nut is matched with the stud by installing the tooling nut on the end face of the hub flange, so that the connecting stability of the stud and the hub is improved.

It is noted that, in this document, relational terms such as "first" and "second" are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Meanwhile, the term "connected" and the like as used herein should be broadly interpreted as referring to a fixed connection, a detachable connection, a direct connection, or an indirect connection through intermediate components. In addition, "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like are referred to herein as being placed in the state shown in the drawings.

It should be further noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.