CN219062328U

CN219062328U - Worm gear and worm driving mechanism for variable pitch bearing of large megawatt wind turbine

Info

Publication number: CN219062328U
Application number: CN202223440620.6U
Authority: CN
Inventors: 李建军; 陈艳; 高锦麟
Original assignee: MingYang Smart Energy Group Co Ltd
Current assignee: MingYang Smart Energy Group Co Ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-05-23
Anticipated expiration: 2032-12-22

Abstract

The utility model discloses a worm and gear driving mechanism for a pitch bearing of a large megawatt wind turbine, which comprises a pitch driving shell, a worm, a pitch driving fixed flange and a pitch driving motor, wherein the pitch driving shell is fixed on a hub of the wind turbine through bolts, the pitch driving fixed flange is fixed on the pitch driving shell through bolts, the pitch driving motor is fixed on the pitch driving fixed flange through bolts and is connected with the worm in the pitch driving shell to provide power for the rotation of the worm, the worm is meshed with an outer gear ring of the pitch bearing to form a worm and gear structure with a self-locking function, and blades of the wind turbine are fixed on the outer gear ring of the pitch bearing through studs. The utility model can drive the outer gear ring of the variable-pitch bearing to drive the blade to change the pitch under the working state of the unit, and realize self-locking of the impeller under the maintenance non-electricity state.

Description

Worm gear and worm driving mechanism for variable pitch bearing of large megawatt wind turbine

Technical Field

The utility model relates to the technical field of a variable-pitch bearing of a large megawatt wind turbine, in particular to a worm and gear driving mechanism for the variable-pitch bearing of the large megawatt wind turbine.

Background

The variable pitch bearing of the current large megawatt wind turbine mainly comprises an outer ring rotating variable pitch bearing (called outer variable pitch for short) and an inner ring rotating variable pitch bearing (called inner variable pitch for short), and variable pitch driving is divided into an outer variable pitch driving and an inner variable pitch driving. The outer variable pitch drive is provided with an electric spur gear variable pitch and an electric belt variable pitch, and for the outer variable pitch drive, the variable pitch structure of the two types is generally complex at present, the cost is high, the maintenance is inconvenient, and the problem needs to be solved urgently.

Disclosure of Invention

The utility model aims to overcome the defects and shortcomings of the prior art, and provides a worm and gear driving mechanism for a variable pitch bearing of a large megawatt wind turbine, which has a simple and reliable structure and low cost, can drive an outer gear ring of the variable pitch bearing to drive blades to change pitch in a working state of the turbine, and can realize self-locking of an impeller in a maintenance non-electricity state.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows: the utility model provides a worm gear driving mechanism for big megawatt wind turbine generator system becomes oar bearing, includes becomes oar drive casing, worm, becomes oar drive fixed flange and becomes oar driving motor, wherein, become oar drive casing and pass through the bolt fastening on wind turbine generator system's wheel hub, become oar drive fixed flange and pass through the bolt fastening on becoming oar drive casing, become oar drive motor and pass through the bolt fastening on becoming oar drive fixed flange to be connected with the worm in the becoming oar drive casing, for the rotatory power that provides of worm, the worm meshes with the outer ring gear of becoming the oar bearing, constitutes the worm gear structure of taking self-locking function, wind turbine generator system's blade passes through the double-screw bolt to be fixed on becoming the outer ring gear of oar bearing.

Further, the outer gear ring is detachably connected with a gear tooth block meshed with the worm.

Further, grease is adopted between the worm and the gear tooth block for lubrication, and redundant grease is removed through seal felts and brushes on two sides of the worm and the gear tooth block.

Further, the gear tooth block is a spheroidal graphite cast iron or cast steel gear tooth block.

Further, the pitch drive motor is in clearance fit with the worm through a flat key.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. compared with the planetary gear used by the existing external pitch drive mechanism, the worm and gear structure of the worm and gear drive mechanism is simple and reliable in structure and low in cost.

2. The self-locking function of the worm gear mechanism can be utilized to effectively replace a blade locking mechanism for locking blades in the original unit blade operation and maintenance working condition.

3. The gear tooth block meshed with the worm is detachably connected on the outer gear ring, so that maintenance and replacement are convenient.

Drawings

Fig. 1 is a schematic structural view of a worm gear driving mechanism.

Fig. 2 is a second schematic structural view of the worm gear driving mechanism.

Detailed Description

The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.

As shown in fig. 1 and 2, the embodiment discloses a worm and gear driving mechanism for a pitch bearing of a large megawatt wind turbine, which comprises a pitch driving shell 2, a worm 3, a pitch driving fixing flange 4 and a pitch driving motor 5, wherein the pitch driving shell 2 is fixed on a hub 6 of the wind turbine through bolts, the pitch driving fixing flange 4 is fixed on the pitch driving shell 2 through bolts, the pitch driving motor 5 is fixed on the pitch driving fixing flange 4 through bolts and is in clearance fit with the worm 3 in the pitch driving shell 2 through a flat key to provide power for the rotation of the worm 3, the worm 3 is meshed with an outer gear of the pitch bearing 1 to form a worm and gear structure with a self-locking function, blades 7 of the wind turbine are fixed on the outer gear of the pitch bearing 1 through high-strength studs, the pitch driving motor 5 drives the worm 3 to drive the outer gear of the pitch bearing 1 to rotate, and then the blades 7 are driven to rotate, and the pitch function is realized.

Preferably, the external gear ring is detachably connected with a gear tooth block 8 meshed with the worm 3, lubricating grease is adopted between the worm 3 and the gear tooth block 8 for lubrication, and redundant grease is removed through seal felts and brushes on two sides of the worm 3 and the gear tooth block 8.

Preferably, the gear tooth block 8 is a ductile iron or cast steel gear tooth block.

The above examples are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present utility model should be made in the equivalent manner, and the embodiments are included in the protection scope of the present utility model.

Claims

1. A worm gear driving mechanism for a large megawatt wind turbine generator system pitch bearing, which is characterized in that: the variable pitch drive device comprises a variable pitch drive shell, a worm, a variable pitch drive fixed flange and a variable pitch drive motor, wherein the variable pitch drive shell is fixed on a hub of a wind turbine generator through bolts, the variable pitch drive fixed flange is fixed on the variable pitch drive shell through bolts, the variable pitch drive motor is fixed on the variable pitch drive fixed flange through bolts and is connected with the worm in the variable pitch drive shell to provide power for the rotation of the worm, the worm is meshed with an outer gear ring of a variable pitch bearing to form a worm and gear structure with a self-locking function, and blades of the wind turbine generator are fixed on the outer gear ring of the variable pitch bearing through studs.

2. The worm and gear driving mechanism for a pitch bearing of a large megawatt wind turbine according to claim 1, wherein: the external gear ring is detachably connected with a gear tooth block meshed with the worm.

3. The worm and gear drive mechanism for a pitch bearing of a large megawatt wind turbine as set forth in claim 2, wherein: lubricating grease is adopted between the worm and the gear tooth block for lubrication, and redundant grease is removed through seal felts and brushes on two sides of the worm and the gear tooth block.

4. The worm and gear drive mechanism for a pitch bearing of a large megawatt wind turbine as set forth in claim 2, wherein: the gear tooth block is a spheroidal graphite cast iron or cast steel gear tooth block.

5. The worm and gear driving mechanism for a pitch bearing of a large megawatt wind turbine according to claim 1, wherein: and the variable pitch driving motor is in clearance fit with the worm through a flat key.