CN214741863U

CN214741863U - Wind power generation system capable of reducing wake flow by using grid

Info

Publication number: CN214741863U
Application number: CN202121056086.1U
Authority: CN
Inventors: 张庆; 张立英; 李芊
Original assignee: Huaneng Clean Energy Research Institute
Current assignee: Huaneng Clean Energy Research Institute
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2021-11-16
Anticipated expiration: 2031-05-17

Abstract

The utility model discloses a wind power generation system for reducing wake flow by using a grid, which comprises a grid system, a wind wheel system and a cabin; the wind wheel system comprises blades and a hub, wherein the blades are arranged on the hub, and the hub is arranged at the front end of the engine room through a rotating shaft; the grid system is arranged on the engine room and is positioned at the wind rear end of the blade; and a wire mesh is arranged on the grid system. The utility model rectifies the wind flowing through the wind wheel through the grille system arranged behind the wind wheel, thereby reducing the turbulence of the wind downstream of the wind wheel and improving the operation safety of the wind generating set; the wake flow loss of the wind power plant can be obviously reduced, and the generating capacity of the wind power plant is improved; the interval between adjacent wind generating sets can be reduced, so that the construction cost is reduced, and the land utilization rate is improved.

Description

Wind power generation system capable of reducing wake flow by using grid

Technical Field

The utility model belongs to the technical field of wind power generation, in particular to utilize grid to reduce wind power generation system of wake.

Background

A horizontal axis wind generator is one of the wind generators. The horizontal axis wind driven generator can be divided into a lift type and a resistance type, wherein the lift type is high in rotation speed, and the resistance type is low in rotation speed. For wind power generation, a lift force type horizontal axis wind turbine is mostly adopted.

For a traditional horizontal axis wind driven generator, wind forms vortex after passing through a rotating surface of a wind wheel, a huge wake flow area is generated behind the wind wheel, the performance of a rear wind machine is obviously influenced, and airflow interference can be completely eliminated only when the distance between a front unit and a rear unit exceeds 20 times of the diameter of the wind wheel, so that the cost of laying cables is greatly increased, and a large amount of land resources are wasted. Meanwhile, the wake flow not only influences the generating capacity, but also brings additional turbulence and influences the operation safety of a downstream wind turbine.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an utilize grid to reduce wind power generation system of wake to reduce aerogenerator's wake loss, promote unit generated energy and operation security.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a wind power generation system utilizing a grid to reduce wake flow, comprising: a grille system, a wind wheel system and a nacelle;

the wind wheel system comprises blades and a hub, wherein the blades are arranged on the hub, and the hub is arranged at the front end of the engine room through a rotating shaft;

the grid system is arranged on the engine room and is positioned at the wind rear end of the blade; and a wire mesh is arranged on the grid system.

The utility model discloses further improvement lies in: the grid system comprises a plurality of fixed rings, wherein each fixed ring comprises an outer ring at the outermost side, an inner ring at the innermost side and a middle fixed ring in the middle; the diameter of the middle fixing ring is reduced from outside to inside in turn; the outer ring, the middle fixing ring and the inner ring are radially connected through a plurality of spokes, so that a plurality of trapezoid-like gratings are formed in the grating system, and a wire mesh is installed in the gratings.

The utility model discloses further improvement lies in: the grille system is fixed on the nacelle through the inner ring.

The utility model discloses further improvement lies in: the radius of the outer ring in a grille system is greater than the length of the blade.

The utility model discloses further improvement lies in: a horizontal guide rail is arranged on the engine room; the inner ring is provided with a guide groove matched with the horizontal guide rail; and a driving mechanism is arranged on the engine room, and the movable end of the driving mechanism is connected with the inner ring and can drive the inner ring to drive the whole grid system to move along the horizontal guide rail.

The utility model discloses further improvement lies in: the driving mechanism is a hydraulic mechanism or an air cylinder.

The utility model discloses further improvement lies in: the inner ring is arranged on a horizontal guide rail of the engine room through a bearing;

the bearing comprises an inner layer and an outer layer which are mutually matched in a sliding way; a groove matched with the horizontal guide rail is arranged in the inner layer, and the outer layer is fixedly connected with the inner ring;

the inner ring is provided with a ring of teeth; the wind power generation system for reducing the wake flow by utilizing the grating also comprises a driving motor matched with the teeth on the inner ring; and a driving gear is arranged on a rotating shaft of the driving motor and is meshed with the teeth on the inner ring.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model relates to an utilize grid to reduce wind power generation system of wake through installing the grid system behind the wind wheel, carries out the rectification to the wind that flows the wind wheel to reduce the turbulent motion degree of wind wheel downstream wind, promote wind generating set's operation security.

2. The utility model relates to an utilize grid to reduce wind power generation system of wake utilizes the grid to reduce the wake, can show the wake loss that reduces wind power generation field, promotes wind power generation field's generated energy.

3. The utility model relates to an utilize grid to reduce wind power generation system of wake utilizes the grid to reduce the wake, can reduce adjacent wind generating set's interval to reduce engineering cost, improve land utilization rate.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:

fig. 1 is a front view of a wind power generation system for reducing wake flow by using a grid according to embodiment 1 of the present invention;

fig. 2 is a side view of a wind power generation system for reducing wake flow by using a grid according to embodiment 1 of the present invention;

fig. 3 is a side view of a wind power generation system for reducing wake flow by using a grid according to embodiment 2 of the present invention;

fig. 4 is a front view of a wind power generation system for reducing wake flow by using a grid according to embodiment 3 of the present invention;

fig. 5 is a side view of a wind turbine system according to embodiment 3 of the present invention, in which a grid is used to reduce wake.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.

Example 1

Referring to fig. 1 to 2, the present invention provides a wind power generation system using a grid to reduce wake flow, which includes a grid system 10, a wind wheel system, and a tower 21 of a nacelle 20.

The nacelle 20 is fixed on top of a tower 21; the wind wheel system comprises blades 6 and a hub 7, wherein the three blades 6 are arranged on the hub 7, and the hub 7 is arranged at the front end of the nacelle 20 through a rotating shaft.

The grille system 10 is arranged on the nacelle 20 at the wind rear end of the blades 6. The grid system 10 comprises a plurality of fixed rings, wherein each fixed ring comprises an outer ring 1 at the outermost side, an inner ring 2 at the innermost side and a middle fixed ring in the middle; the diameter of the middle fixing ring is reduced from outside to inside in turn; the outer ring 1, the middle fixing ring and the inner ring 2 are radially connected through a plurality of spokes 5, so that a plurality of trapezoid-like grids 3 are formed in the grid system 10, and a wire mesh 4 is installed in the grids 3. The grille system 10 is fixed to the nacelle 20 by means of the inner ring 2.

The radial dimension of the outer ring 1 of the grille system 10 is greater than the length dimension of the blades 6, and the diameter dimension of the inner ring 2 is about the diameter of the blades 6 at the blade root.

The distance of the grid system 10 from the blades 6 is 3-8 meters.

The area of the individual through-openings of the screen 4 in the grid system is less than or equal to 25 square centimeters.

Example 2

Referring to fig. 3, on the basis of embodiment 1, in embodiment 2, a horizontal guide rail 201 is provided on the nacelle 20; the inner ring 2 is provided with a guide groove matched with the horizontal guide rail 201; the nacelle 20 is provided with a driving mechanism 22, the movable end of the driving mechanism is connected with the inner ring 2, and the driving mechanism is used for driving the inner ring 2 to drive the whole grid system 10 to move along the horizontal guide rail 201 so as to adjust the distance between the grid system 10 and the blades 6, and therefore the distance between the grid system 10 and the blades 6 is changed along with the change of the wind speed.

The drive mechanism 22 is a hydraulic mechanism or a cylinder.

Example 3

Referring to fig. 4 and 5, on the basis of embodiment 1 or embodiment 2, in embodiment 3, the inner ring 2 is mounted on a horizontal guide rail 201 of the nacelle 20 through a bearing. The bearing comprises an inner layer 31 and an outer layer 32; a groove matched with the horizontal guide rail 201 is formed in the inner layer 31, and the outer layer 32 is fixedly connected with the inner ring 2; between the inner 31 and outer 32 layers are balls or graphite for lubrication.

A ring of teeth are arranged on the inner ring 2; the utility model relates to an utilize grid to reduce wind power generation system of wake flow still include with inner circle 2 last tooth matched with driving motor 23. The rotating shaft of the driving motor 23 is provided with a driving gear which is meshed with the teeth on the inner ring 2. The rotation of the driving motor 23 can drive the inner ring 2 to drive the bearing to rotate through the driving gear, so as to drive the whole grating system 10 to rotate around the engine room 20, and the wake loss is reduced more obviously.

The utility model relates to an utilize grid to reduce wind power generation system's of wake operating method, including following step:

wind generated in the rotation process of the blades 6 is rectified after passing through the silk screen 4, so that wake flow loss is reduced;

according to the wind speed, the grid system 10 is driven to move along the horizontal guide rail 201 through the driving mechanism 22, and the distance between the grid system 10 and the blades 6 is adjusted;

according to the working condition, the grid system 10 is driven to rotate by the driving motor 23, and the wake flow loss is further reduced.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.

Claims

1. A wind power generation system for reducing wake flow using a grid, comprising: a grid system (10), a wind rotor system and a nacelle (20);

the wind wheel system comprises blades (6) and a hub (7), the blades (6) are arranged on the hub (7), and the hub (7) is arranged at the front end of the engine room (20) through a rotating shaft;

the grid system (10) is arranged on the engine room (20) and is positioned at the wind rear end of the blade (6); and a wire mesh (4) is arranged on the grid system (10).

2. A wind power system for reducing wake flow by means of a grid according to claim 1, characterized in that the grid system (10) comprises several fixed rings, including an outermost outer ring (1), an innermost inner ring (2), and an intermediate fixed ring; the diameter of the middle fixing ring is reduced from outside to inside in turn; the outer ring (1), the middle fixing ring and the inner ring (2) are radially connected through a plurality of spokes (5), so that a plurality of trapezoid-like grids (3) are formed in the grid system (10), and the wire mesh (4) is installed in the grids (3).

3. Wind power system for reducing wake flow by means of a grid according to claim 2, characterized in that the grid system (10) is fixed to the nacelle (20) by means of an inner ring (2).

4. A wind power system for reducing wake by means of a grid according to claim 2, characterized in that the radius of the outer ring (1) of the grid system (10) is larger than the length of the blades (6).

5. Wind power system for reducing wakes with a grid according to claim 2, characterised in that the nacelle (20) is provided with horizontal guiding rails (201); the inner ring (2) is provided with a guide groove matched with the horizontal guide rail (201); and a driving mechanism (22) is arranged on the engine room (20), the movable end of the driving mechanism is connected with the inner ring (2), and the inner ring (2) can be driven to drive the whole grid system (10) to move along the horizontal guide rail (201).

6. Wind power system for reducing wake flow by means of a grid according to claim 5, characterised in that said driving means (22) are hydraulic or pneumatic.

7. Wind power system for reducing wake by means of a grid according to claim 2, characterised in that the inner ring (2) is mounted on horizontal rails (201) of the nacelle (20) by means of bearings;

the bearing comprises an inner layer (31) and an outer layer (32) which are mutually matched in a sliding way; a groove matched with the horizontal guide rail (201) is formed in the inner layer (31), and the outer layer (32) is fixedly connected with the inner ring (2);

a ring of teeth are arranged on the inner ring (2); the wind power generation system for reducing the wake flow by utilizing the grating further comprises a driving motor (23) matched with teeth on the inner ring (2); a driving gear is arranged on a rotating shaft of the driving motor (23), and the driving gear is meshed with the teeth on the inner ring (2).

8. A wind power system for reducing wake by means of a grid according to claim 1, characterized in that the grid system (10) is at a distance of 3-8 meters from the blades (6).

9. Wind-power unit according to claim 1, characterised in that the area of the individual openings of the wire mesh (4) in the grid system is less than or equal to 25 cm.