CN114576078A

CN114576078A - Double wind wheel power generation device

Info

Publication number: CN114576078A
Application number: CN202210272338.7A
Authority: CN
Inventors: 李新凯; 郭小江; 唐巍; 叶昭良
Original assignee: Huaneng Clean Energy Research Institute
Current assignee: Huaneng Clean Energy Research Institute
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-06-03
Anticipated expiration: 2042-03-18
Also published as: CN114576078B

Abstract

The invention provides a double wind wheel power generation device, comprising: the wind power generation device comprises an installation platform (10), a generator cabin (20), a front wind wheel (30) and a rear wind wheel (40), wherein the generator cabin (20) is arranged on the installation platform (10), and power generation equipment is arranged in the installation platform (10) or the generator cabin (20); the front wind wheel (30) is arranged on the generator cabin (20) and is in transmission connection with the power generation equipment, and the front wind wheel (30) comprises three front blades (31); the rear wind wheel (40) is arranged in the generator cabin (20) and is in transmission connection with the power generation equipment, the rear wind wheel (40) comprises two rear blades (41), and the chord length of each rear blade (41) is gradually increased from the blade root to the blade tip and then gradually decreased; the diameter of the front wind wheel (30) is D1, the diameter of the rear wind wheel (40) is D2, and D2 is (0.78-0.85) D1. The double-wind-wheel power generation device is high in power generation efficiency, the rear wind wheel with the two blades is lower in manufacturing cost, and installation and transportation cost is also reduced.

Description

Double wind wheel power generation device

Technical Field

The invention relates to the technical field of wind power generation, in particular to a double-wind-wheel power generation device.

Background

Wind energy is receiving attention as a renewable new energy source due to its advantages of wide sources, large reserves, no pollution, etc. The electric energy is used as a special carrier of energy and has the characteristics of cleanness, high efficiency, environmental friendliness and the like, so that the great significance in the vigorous development of wind power generation is achieved.

In the related art, a wind turbine is usually mounted on a tower column to generate power, and the wind power generation device in the mode is high in cost and not beneficial to large-scale use. Therefore, the total power generation of all wind power generation devices in a certain area is smaller than the number of wind power generation devices.

Therefore, how to improve the average power generation amount of a single wind power generation device in unit time becomes a technical problem to be solved urgently in the field.

Disclosure of Invention

The present invention is based on the discovery and recognition by the inventors of the following facts and problems: two wind wheels are installed on one tower column to generate electricity, so that the total amount of electricity generation is increased. In addition, the number of the two wind wheel blades is adjusted to achieve the purpose of reducing the mutual influence between the two wind wheels, so that the overall efficiency of the two wind wheels is maximized.

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an embodiment of the present invention provides a dual wind turbine power generation apparatus, including:

an installation table;

the generator cabin is arranged on the mounting platform, and generating equipment is arranged in the mounting platform or in the generator cabin;

the front wind wheel is arranged in the generator cabin and is in transmission connection with the power generation equipment, the front wind wheel comprises three front blades, and the chord length of each front blade is gradually increased from the blade root to the blade tip and then gradually decreased; and

the rear wind wheel is arranged in the generator cabin and is in transmission connection with the power generation equipment, the rear wind wheel comprises two rear blades, and the chord length of each rear blade is gradually increased from the blade root to the blade tip and then gradually decreased;

the diameter of the front wind wheel is D1, the diameter of the rear wind wheel is D2, and D2 is (0.78-0.85) D1.

The double-wind-wheel power generation device provided by the embodiment of the invention has the following technical effects: through setting up 3 preceding blades with preceding wind wheel, the back wind wheel sets up the compound mode of two back blades to adjust the diameter ratio of preceding wind wheel and back wind wheel and be D2 ═ D1, (0.78-0.85) D1, make two wind wheel power generation facility's whole generating efficiency obtain improving, and set up the back wind wheel manufacturing cost of two blades and lower, installation and cost of transportation also reduce.

Optionally, the distance between the front wind wheel and the rear wind wheel is A, and the range of A is 0.25-0.3 times of the diameter of the front wind wheel.

Optionally, the length of the part of the front blade with the gradually increased chord length from the blade root to the blade tip is 1/7-1/5 of the total length of the front blade;

the length of the chord length of the rear blade gradually increasing from the blade root to the blade tip is 1/7-1/5 of the total length of the rear blade.

Optionally, the chord length of the front blade is L1, the thickness of the front blade is S1, the L1 and the S1 are located at the same position of the front blade, the relative chord length of the front blade is equal to S1/L1, and the range of the relative chord length of the front blade is 15% -40%.

Optionally, the chord length of the rear blade is L2, the thickness of the rear blade is S2, the L2 and the S2 are located at the same position of the rear blade, the relative chord length of the rear blade is equal to S2/L2, and the range of the relative chord length of the rear blade is 15% -40%.

Optionally, the thickness of the front blade is gradually thinner along the direction from the blade root to the blade tip; the thickness of the rear blade is gradually thinner along the direction from the blade root to the blade tip.

Optionally, the material of the front blade and/or the rear blade is a glass fiber composite material.

Optionally, the power generation equipment is a dual-rotor generator, the rotating shaft of the front wind wheel is in transmission connection with a first rotor of the dual-rotor generator, and the rotating shaft of the rear wind wheel is in transmission connection with a second rotor of the dual-rotor generator.

Optionally, the axis of the rotating shaft of the front wind wheel coincides with the axis of the rotating shaft of the rear wind wheel.

Optionally, the mounting platform is a hollow concrete tower.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic perspective view of a dual wind turbine generator according to an embodiment of the present invention;

FIG. 2 is a rear view of a dual wind turbine generator of an embodiment of the present invention;

FIG. 3 is a front view of a dual wind turbine generator of an embodiment of the present invention;

FIG. 4 is a side view of a dual wind turbine generator according to an embodiment of the present invention;

FIG. 5 is a top view of a dual wind turbine generator according to an embodiment of the present invention;

FIG. 6 is a front view of a front blade of an embodiment of the present invention, the right side of the front blade showing the cross-sectional trend of the front blade;

FIG. 7 is a spanwise chord length distribution of a leading blade according to an embodiment of the present invention.

Reference numerals: 10-mounting a platform;

20-a generator compartment;

30-front wind wheel; 31-the front leaf;

40-rear wind wheel; 41-rear leaf.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The present embodiment provides a double wind wheel power generation device that can be used on water or on land. Referring to fig. 1 to 5, the dual wind turbine generator mainly includes: mounting platform 10, generator nacelle 20, front rotor 30, and rear rotor 40.

The mounting platform 10 may be a concrete tower or a metal tower, and functions to support the generator room 20 and ensure the stability of the operation of the generator room 20 and the front and

rear wind wheels

30 and 40 disposed on the generator room 20.

The generator room 20 is arranged on the mounting table 10; a power generation device for generating power is arranged in the installation platform 10 or the generator cabin 20; the front wind wheel 30 and the rear wind wheel 40 can be both in transmission connection with a power generation device, so that the front wind wheel 30 and the rear wind wheel 40 convert mechanical energy into electric energy through a generator when rotating.

The front wind wheel 30 is arranged in the generator cabin 20 and comprises three front blades 31 distributed in a circumferential array, and the chord length of each front blade 31 is gradually increased from the blade root to the blade tip and then gradually decreased; the rear wind wheel 40 is arranged in the generator cabin 20 and comprises two rear blades 41 distributed in a circumferential array, and the chord length of each rear blade 41 gradually increases from the blade root to the blade tip and then gradually decreases; thus, the front blade 31 and the rear blade 41 have the same shape, and are mainly different in size, specifically, the diameter of the front wind wheel 30 is D1, and the diameter of the rear wind wheel 40 is D2, where D2 is (0.78-0.85) D1.

In the above-mentioned scheme, the front wind wheel 30 is provided with 3 front blades 31 to obtain more wind energy, and the rear wind wheel 40 is provided with two rear blades 41 to capture the airflow flowing through the front wind wheel 30, in this configuration, the diameter ranges of the front wind wheel 30 and the rear wind wheel 40 are selected to satisfy D2 ═ 0.78-0.85D 1, so as to maximize the overall power generation efficiency of the double-wind-wheel power generation device.

Therefore, two main characteristics that make two wind wheel power generation facility generating efficiency improve among the above-mentioned scheme are: the front wind wheel 30 is provided with 3 blades, the rear wind wheel 40 is provided with two blades, and the diameter range of the front wind wheel 30 and the diameter range of the rear wind wheel 40 meet the requirement that D2 is (0.78-0.85) D1.

The technical personnel of this application have found through the experiment that under the condition of setting up three blades of preceding wind wheel 30, two blades of back wind wheel 40, if D2 is less than 0.78D1, perhaps D2 is greater than 0.85D1, preceding wind wheel 30 and the whole generating efficiency of back wind wheel 40 have certain reduction.

In addition, the rear wind wheel 40 is lower in manufacturing cost due to the fact that two blades are arranged compared with 3 blades, installation and transportation cost is also reduced, construction efficiency of the double-wind-wheel power generation device can be improved, and construction period is shortened.

In some embodiments, the diameter ratio of front rotor 30 and rear rotor 40 may be: D2-0.79D 1, D2-0.8D 1, D2-0.82D 1, etc.

In some embodiments, the leading blade 31 has a chord length that increases from the root to the tip in a portion 1/7-1/5 of the total length of the leading blade 31; the chord length of the rear blade 41 is 1/7-1/5 of the total length of the rear blade 41 in the most gradually increasing part from the blade root to the blade tip. Fig. 6 also reflects the length range of the gradually increasing part of the chord length of the front blade 31 from the blade root to the blade tip. Within this range, both front rotor 30 and rear rotor 40 have higher operating efficiency.

Referring to fig. 3, the chord length of the front blade 31 is L1, the thickness is S1, L1 and S1 are located at the same position of the front blade 31, the relative chord length of the front blade 31 is equal to S1/L1, and the range of the relative chord length of the front blade 31 is 15% -40%. Of course, the relative chord lengths of the leading blades 31 differ at different locations. Referring to fig. 6, it can be seen that the relative chord length of the front blade 31 gradually increases and then gradually decreases, and the increasing speed is faster than the decreasing speed.

In some embodiments, the trailing blade 41 has a chord length of L2 and a thickness of S2, L2 and S2 are located at the same position of the trailing blade 41, the relative chord length of the trailing blade 41 is equal to S2/L2, and the relative chord length of the trailing blade 41 ranges from 15% to 40%. Since the rear blade 41 and the front blade 31 employ the same type of blade, a view of the rear blade 41 is not shown and those skilled in the art can understand with reference to the front blade 31.

In some embodiments, the thickness of the front blade 31 tapers in the direction from the blade root to the blade tip; the thickness of the rear blade 41 becomes gradually thinner in the direction from the blade root to the blade tip. Therefore, the firmness of installation of the front blade 31 and the rear blade 41 is ensured, and the rotation is more stable.

In some embodiments, front rotor 30 includes 3 front blades 31 and rear rotor 40 includes 3 rear blades 41. That is, the dual wind turbine generator in this embodiment is in the form of 3 blades at the front and rear.

In some embodiments, the distance between front rotor 30 and rear rotor 40 is A, where A is in the range of 0.25-0.3 times the diameter of front rotor 30. In this range, on the basis of guaranteeing that the front wind wheel 30 and the rear wind wheel 40 are stably installed, the influence of the front wind wheel 30 on the rear wind wheel 40 is further reduced, and therefore the overall power generation efficiency of the double-wind-wheel power generation device is improved.

In some embodiments, the power plant is a dual rotor generator, the shaft of the front wind wheel 30 is drivingly connected to a first rotor of the dual rotor generator, and the shaft of the rear wind wheel 40 is drivingly connected to a second rotor of the dual rotor generator. That is, only one generator may be disposed in the generator compartment 20, and the front wind wheel 30 and the rear wind wheel 40 respectively drive different rotors of the generator to work, so as to reduce the weight of the generator compartment 20 and reduce the difficulty in installing the dual-wind-wheel power generation device.

In some embodiments, the axis of the shaft of front rotor 30 coincides with the axis of the shaft of rear rotor 40.

In some embodiments, the installation station 10 is a hollow concrete tower.

In some embodiments, the material of the leading blade 31 and/or the trailing blade 41 is a fiberglass composite. The material can ensure the structural strength, has lighter weight, is favorable for installation and transportation, and ensures the stability in the power generation process to the maximum extent.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A dual wind turbine generator, comprising:

a mounting table (10);

the generator room (20), the generator room (20) is arranged on the installation platform (10), and power generation equipment is arranged in the installation platform (10) or in the generator room (20);

the front wind wheel (30) is arranged on the generator cabin (20) and is in transmission connection with the power generation equipment, the front wind wheel (30) comprises three front blades (31), and the chord length of each front blade (31) is gradually increased from the blade root to the blade tip and then gradually decreased; and

the rear wind wheel (40) is arranged on the generator cabin (20) and is in transmission connection with the power generation equipment, the rear wind wheel (40) comprises two rear blades (41), and the chord length of each rear blade (41) is gradually increased from the blade root to the blade tip and then gradually decreased;

the diameter of the front wind wheel (30) is D1, the diameter of the rear wind wheel (40) is D2, and D2 is (0.78-0.85) D1.

2. A double wind wheel power plant according to claim 1, characterized in that the distance between the front wind wheel (30) and the rear wind wheel (40) is a, in the range of 0.25-0.3 times the diameter of the front wind wheel (30).

3. A double wind turbine generator according to claim 1, wherein the length of the gradually increasing part of the chord length of the front blade (31) from the blade root to the blade tip is 1/7-1/5 of the total length of the front blade (31);

the length of the chord length of the rear blade (41) gradually increasing from the blade root to the blade tip is 1/7-1/5 of the total length of the rear blade (41).

4. The double wind wheel power generation device according to claim 1, wherein the chord length of the front blade (31) is L1, the thickness is S1, the L1 and the S1 are located at the same position of the front blade (31), the relative chord length of the front blade (31) is equal to S1/L1, and the relative chord length of the front blade (31) is in the range of 15% -40%.

5. The twin wind turbine generator of any one of claims 1 to 4, characterised in that the trailing blade (41) has a chord length of L2 and a thickness of S2, the L2 and the S2 are located at the same position of the trailing blade (41), the relative chord length of the trailing blade (41) is equal to S2/L2, and the relative chord length of the trailing blade (41) ranges from 15% to 40%.

6. Double wind turbine generator according to claim 5, characterized in that the thickness of said front blades (31) is tapered in the direction from the blade root to the blade tip; the thickness of the rear blade (41) becomes thinner gradually along the direction from the blade root to the blade tip.

7. Double wind turbine generator according to claim 1, wherein the material of the front blade (31) and/or the rear blade (41) is a glass fibre composite.

8. The dual wind wheel power plant according to claim 1, wherein the power plant is a dual rotor generator, the rotating shaft of the front wind wheel (30) is in driving connection with a first rotor of the dual rotor generator, and the rotating shaft of the rear wind wheel (40) is in driving connection with a second rotor of the dual rotor generator.

9. A double wind wheel power plant according to claim 8, characterized in that the axis of the rotation shaft of the front wind wheel (30) coincides with the axis of the rotation shaft of the rear wind wheel (40).

10. A double wind turbine power plant according to claim 1, characterized in that said installation platform (10) is a hollow concrete tower.