AU2021101510A4

AU2021101510A4 - Vertical Shaft Wind Turbine Applying a Wind Turbine Propeller

Info

Publication number: AU2021101510A4
Application number: AU2021101510A
Authority: AU
Inventors: Xiaosen Duan; Jiangtao Guo; Yuting Lang; Ziyun LIU; Xinyun Ma; Guoping Shen; Lingying Song
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-05-27
Anticipated expiration: 2029-03-24

Abstract

The present utility model discloses a vertical shaft wind turbine applying a wind turbine propeller, and relates to the field of wind power generation equipment. The vertical shaft wind 5 turbine applying a wind turbine propeller includes a cantilever support frame connected to a wind turbine main shaft, and blades arranged on the cantilever support frame in an opening/closing manner. One end, far away from the wind turbine main shaft, of the blade is rotatably connected to the cantilever support frame. An arc-shaped plate is arranged at the other end of the blade. The inner arc surface of the arc-shaped plate is arranged windward. A first 10 blocking part used for blocking the blade from rotating to the direction of a leeward surface thereof is arranged between the cantilever support frame and the blade. According to the present utility model, the arc-shaped plate is arranged at one end of the blade; the inner arc surface of the arc-shaped plate is arranged windward; when the windward surface of the blade is impacted by external wind, due to an arc-shaped structure, the wind that blows to a blade door forms a 15 vortex at the arc-shaped structure to produce fluid momentum, which increases the pushing force for the blade door and improves the utilization rate of external wind energy, thereby improving the power generation efficiency of the wind turbine. the present utility model has the advantages of simple structure and low cost.

Description

VERTICAL SHAFT WIND TURBINE APPLYING A WIND TURBINE PROPELLER

TECHNICAL FIELD The present utility model relates to the field of wind power generation equipment, and in particular, to a vertical shaft wind turbine applying a wind turbine propeller.

BACKGROUND Wind energy is clean renewable energy. Wind power generation has a very broad industrial development prospect due to its advantages of no fuel, no arable land, no pollution, and low operation cost. Due to the need for directional wind, the direction of a wind wheel of a three-blade parallel wind turbine needs to be adjusted timely, sometimes, the wind direction changes instantaneously, which will lead to frequent rotation of the wind wheel. The rotation speed of the whole wind turbine set is constant, so the set cannot operate at an optimal blade-tip rotating speed ratio in a low wind speed range, which results in energy loss in the low wind speed range. In addition, due to the structural characteristics of the three-blade parallel wind turbine, it is easy to cause the fracture of the blades and shaft. Most of blades of the vertical shaft wind turbine are fixed, so rotation resistance is formed very easily. The invention patent with the application number of "201810262544.3" and entitled "VERTICAL SHAFT WIND TURBINE" discloses a vertical shaft wind turbine. The vertical shaft wind turbine includes a propeller frame, a propeller, a first blocking block, a second blocking block, a vertical shaft, a propeller shaft, and the like. The propeller fits on the propeller shaft in a rotary manner. The propeller shaft is arranged in the propeller frame. The propeller frame is connected to the vertical shaft. The propeller can rotate relative to the propeller frame to perform an opening/closing action. When the windward surface of the propeller faces the wind, the propeller is blown and is blocked to be in a closed state by the first blocking block, which is the same as a normal propeller. After the propeller frame rotates, the leeward surface of the propeller faces the wind, the propeller is blown to be in an open state, which reduces the resistance of the wind. The propeller is blocked by the second blocking block, which prevents an opening angle of the propeller from being opened too large. The propeller fits the rotation and some limitations on the propeller shaft, so the maximum dynamic wind and the minimum resistance wind are obtained by changing the direction of the propeller reciprocally. Under the combined action of a plurality of groups of propellers, the kinetic energy of the wind energy obtained by various groups of the propellers is centralized to a gearbox through the transfer of a horizontal transmission shaft, and proper rotating speed and torque are transferred to corresponding wind turbine sets through speed changing of the gearbox, so as to achieve an optimal power generation effect to ensure that the optimal quantity of electricity is generated. However, the angle between the connecting line of the second blocking block and the propeller shaft and the connecting line of the first blocking block and the propeller shaft is less than 90, that is to say, when the opening angle of the propeller is less than 90°, though the objective of reducing the wind resistance to a certain extent can be achieved, there is still a part of wind blowing on the propeller to form a certain resistance when the propeller shaft is perpendicular to the wind direction. The blades of the propeller are of straight plate-shaped structures, so the wind will escape from the periphery of the blades when blowing on the blades, and the energy of the escaping wind cannot be utilized effectively, so the obtaining rate of the kinetic energy is reduced, that is to say, the power generation efficiency is reduced. Therefore, a vertical shaft wind turbine with a simple structure, high wind energy utilization rate, high power generation efficiency, high structural strength, and low cost is urgently needed.

SUMMARY The objective of the present utility model is to provide a vertical shaft wind turbine applying a wind turbine propeller, so as to solve the problems in the prior art. The vertical shaft wind turbine applying a wind turbine propeller has the advantages of simple structure, high wind energy utilization rate, high power generation efficiency, high structural strength, and low cost. In order to achieve the objective above, the present utility model provides the following solution: a wind turbine propeller is provided, which includes a cantilever support frame connected to a wind turbine main shaft, and blades arranged on the cantilever support frame in an opening/closing manner. One end, far away from the wind turbine main shaft, of the blade is rotatably connected to the cantilever support frame; an arc-shaped plate is arranged at the other end of the blade; the inner arc surface of the arc-shaped plate is arranged windward; a first blocking part used for blocking the blade from rotating to the direction of a leeward surface thereof is arranged between the cantilever support frame and the blade. Preferably, the inner arc surface of the arc-shaped plate is in smooth transition connection with a windward surface of the blade; the arc-shaped plate and the blade are arranged integrally. Preferably, the central angle of the inner arc surface of the arc-shaped plate does not exceed 90°. Preferably, when the blade is blocked by the first blocking part, the blade sinks into a plane where the cantilever support frame and the wind turbine main shaft are located.

Preferably, the wind turbine propeller further includes a second blocking part used for limiting an opening angle of the blade; the second blocking part is arranged between the windward surface of the blade and the cantilever support frame. Preferably, a rubber matrix is arranged on the outer wall of each of the first blocking part and the second blocking part. Preferably, a vertical shaft wind turbine applying the above-mentioned wind turbine propeller is further provided. The vertical shaft wind turbine includes a wind turbine main shaft, a hub, a plurality of wind turbine propellers, and an energy conversion system. The cantilever support frame is connected to the wind turbine main shaft through the hub; the wind turbine main shaft is connected to the energy conversion system. Preferably, there are four wind turbine propellers; the four wind turbine propellers are connected to the wind turbine main shaft in a helical structure with a dihedral angle of 90

. Compared with the prior art, the present utility model achieves the following technical effects: 1. In the present utility model, one end, far away from the wind turbine main shaft, of the blade is rotatably connected to the cantilever support frame; the blade can perform opening/closing movement relative to a plane where the cantilever support frame and the wind turbine main shaft are located. The arc-shaped plate is arranged at the other end of the blade. The inner arc surface of the arc-shaped plate is arranged windward. When external wind starts to impact the windward surface of the blade, the blade rotates relative to the cantilever support frame under an impact force, and does not rotate to its leeward surface any longer until being blocked by the first blocking part, so that the blade is closed with the plane where the cantilever support frame and the wind turbine main shaft are located. At the moment, the external wind impacts the windward surface of the blade and pushes the cantilever support frame to rotate through the first blocking part, so as to transfer the rotation to the wind turbine main shaft, thereby completing power generation. When the leeward surface of the blade faces the wind, the external air blows the blade open, which eliminates the resistance to the rotation of the wind turbine main shaft when the external wind impacts the leeward surface of the blade. In the process that the blade is impacted by the external wind, because the inner arc surface of the arc-shaped plate is arranged windward, the wind blowing to a blade door forms, through an arc-shaped streamline structure, a vortex at the arc-shaped structure to produce fluid momentum, which increases a pushing force to the blade door according to Newton's third law. In addition, the wind that will escape from the periphery of the blade originally will also enter the arc-shaped plate to do work, which improves the utilization rate of the energy of the external wind, thereby improving the power generation efficiency of the wind turbine.

2. In the present utility model, the inner arc surface of the arc-shaped plate is in smooth transition connection with the windward surface of the blade, and the arc-shaped and the blade are integrally arranged, which eliminates the problems that wind flow is disturbed by uneven connection caused by a machining error and the capture effect of the wind energy is reduced. 3. In the present utility model, the central angle of the inner arc surface of the arc-shaped plate does not exceed 900, which avoids the problem that the utilization efficiency of the wind energy is reduced because an outer arc surface of the arc-shaped plate blocks the external wind from impacting the inner arc surface when the central angle is greater than 90. 4. In the present utility model, the second blocking part is further arranged between the windward surface of the blade and the cantilever support frame. In an opening process of the blade, the second blocking part will block continuous opening of the blade, which avoids the problem of collision with other parts when the opening angle is too large, and the problem of reducing the utilization rate of the wind energy because the time required for closing the blade is increased and the time for capturing the wind energy is shortened due to the blowing of wind when the blade moves to the windward side.

BRIEF DESCRIPTION OF THE DRAWINGS To describe the technical solutions in the embodiments of the present utility model or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present utility model, and those of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is a schematic structural diagram when the blade of a propeller of the present utility model is completely opened; FIG. 2 is a schematic structural diagram when the blade of the propeller of the present utility model is half opened; FIG. 3 is a schematic structural diagram when the blade of the propeller of the present utility model is closed; FIG. 4 is a schematic structural diagram of a vertical shaft wind turbine of the present utility model. In the drawings: 1-cantilever support frame; 2-blade; 3-blade shaft; 4-second blocking part; 5-first blocking part; 6-wind turbine main shaft.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present utility model will be clearly and completely described herein below with reference to the accompanying drawings in the embodiments of the present utility model. It is apparent that the described embodiments are merely part rather than all of the embodiments of the present utility model. On the basis of the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model. The objective of the present utility model is to provide a vertical shaft wind turbine applying a wind turbine propeller, so as to solve the problems in the prior art. The vertical shaft wind turbine applying a wind turbine propeller has the advantages of simple structure, self leveling, high structural strength, and low cost. In order to make the above objective, features, and advantages of the present utility model more apparent and more comprehensible, the present disclosure is further described in detail below with reference to the accompanying drawings and specific implementation manners. Embodiment 1: Referring to FIGs. 1 to 3, a wind turbine propeller is provided. The wind turbine propeller includes a cantilever support frame 1 connected to a wind turbine main shaft 6, and blades 2 arranged on the cantilever support frame 1 in an opening/closing manner. The blades 2 can perform opening/closing movement relative to the plane where the cantilever support frame 1 and the wind turbine main shaft 6 are located. A first blocking part 5 is arranged between the cantilever support frame 1 and the wind turbine main shaft 6. The first blocking part 5 is used for blocking the blade 2 from rotating to the direction of a leeward surface thereof, so that when a windward surface of the blade 2 is impacted by external wind, the blade 2 is blocked by the first blocking part 5 to convert the impact force on the blade 2 into the power for pushing the cantilever support frame 1 to rotate; when the leeward surface of the blade 2 is impacted by the external wind, the external wind blows the blade 2 open, which eliminates the resistance to the rotation of the wind turbine main shaft 6 when the external wind impacts the leeward surface of the blade 2, and realizes a cycle working state of downwind closing and upwind opening. There may be one or more cantilever support frames 1. When there is one cantilever support frame 1, one end, far away from the wind turbine main shaft 6, of one blade 2 is rotatably connected to the cantilever support frame 1, or multiple blades 2 may be arranged in the extending direction of the cantilever support frame 1. At the moment, it is necessary to ensure that one end, far away from the wind turbine main shaft 6, of each of the multiple blades 2 is rotationally connected with the cantilever support frame 1. When there are multiple cantilever support frames 1, the multiple cantilever support frames 1 are arranged in sequence from top to bottom. A blade 2 is arranged in the space formed between adjacent cantilever support frames 1. One end, far away from the wind turbine main shaft 6, of the blade 2 is rotatably connected to the cantilever support frames 1 on the two sides thereof, or multiple blades 2 may be arranged between the adjacent cantilever support frames 1. At the moment, it is necessary to ensure that one end, far away from the wind turbine main shaft 6, of each of the multiple blades 2 is rotatably connected to the cantilever support frames 1 on the two sides thereof. The rotating connection manner of the blade 2 and the cantilever support frame 1 may be that one end, far away from the wind turbine main shaft 6, of the blade 2 is arranged on a blade shaft 3 in a sleeving manner and may rotate relative to the blade shaft 3, the blade shaft 3 is fixedly connected to the cantilever support frame 1, or the blade shaft 3 is fixed to one end, far away from the wind turbine main shaft 6, of one blade 2, and the blade shaft 3 is connected to the cantilever support frame 1 through a bearing. An arc-shaped plate is arranged at one end, far away from the position connected to the cantilever support frame 1, of the blade 2. The inner arc surface of the arc-shaped plate is arranged windward, so that the wind blowing to the blade 2 forms a vortex at the arc-shaped structure to produce fluid momentum, which increases the pushing force to the blade 2 according to Newton's third law, and improves the utilization efficiency of the wind energy. In addition, the wind that will escape from the periphery of the blade 2 originally will also enter the arc-shaped plate to do work, which further improves the utilization rate of the energy of the external wind. In the process of machining parts, it is inevitable to produce errors due to the accuracy problem, which will lead to a height difference at the junction between the blade 2 and the arc-shaped plate. The existence of the height difference will disturb the wind flow impacting on the windward surface, reduce the kinetic energy of wind flow, and then reduce the amount of the wind energy that can be captured by the blade 2 and the arc-shaped plate. In order to avoid this situation, the inner arc surface of arc-shaped plate can be in smooth transition connection with the windward surface of the blade 2, and the arc-shaped plate and the blade 2 are integrally arranged. In order to prevent the outer arc surface of the arc-shaped plate from blocking the external wind from impacting the inner arc surface, the central angle of the inner arc surface of the arc-shaped plate does not exceed 90 °, so as to ensure the functions of the arc-shaped plate. When the blade 2 is blocked by the first blocking part 5, the outer arc surface of the arc-shaped plate of the blade 2 is in contact with the first blocking part 5. The blade 2 sinks into a plane where the cantilever support frame 1 and the wind turbine main shaft 6 are located. At the moment, the blade 2 is in an outward inclined closed state in the plane where the blade shaft

3 and the first blocking part 5 are located relative to the plane where the cantilever support frame 1 and the wind turbine main shaft 6 are located. A second blocking part 4 used for limiting the opening angle of the blade 2 may also be arranged. The second blocking part 4 is arranged between the windward surface of the blade 2 and the cantilever support frame 1. In an opening process of the blade 2, the second blocking part 4 will block continuous opening of the blade 2, which avoids the problem of collision with other parts when the opening angle is too large, and the problem of reducing the utilization rate of the wind energy because the time required for closing the blade is increased and the time for capturing the wind energy is shortened due to the blowing of wind when the blade moves to the windward side. When the blade 2 is blocked by the second blocking part 4, the optimal angle between the plane where the cantilever support frame 1 and the wind turbine main shaft 6 are located and the blade 2 is 90, which can ensure the elimination of the resistance produced when the leeward surface is winded, and can also ensure that the windward surface is quickly adjusted to the closed state when the windward surface is winded. At the moment, the blade 2 is outward inclined and closed relative to the plane where the cantilever support frame 1 and the wind turbine main shaft 6 are located, so that the rotatable angle of the blade 2 is greater than 90°. The first blocking part 5 and the second blocking part 4 may be arranged on the cantilever support frame 1, which can ensure that stress can be dispersed to the cantilever support frame 1 through the first blocking part 5 and the second blocking part 4 in case of realizing original functions of the first blocking part 5 and the second blocking part 4, and increase the structural strength of the wind turbine propeller. Both the first blocking part 5 and the second blocking part 4 may be blocking levers. Because the blade 2 may collide with the first blocking part 5 and the second blocking part 4 during rotation, in order to protect the blade 2 from being damaged, a rubber matrix used for absorbing shock and reducing noise is arranged on the outer wall of each of the first blocking part 5 and the second blocking part 4, which prolongs the service life of the blade 2. The working principle of the wind turbine of the present utility model is that: when external wind starts to impact the windward surface of the blade 2, the blade 2 rotates relative to the cantilever support frame 1 under an impact force, and does not rotate to its leeward surface any longer until being blocked by the first blocking part 5 to form an outward inclined closed state with the plane where the cantilever support frame 1 and the wind turbine main shaft 6 are located. At the moment, the external wind impacts the windward surface of the blade 2 and pushes the cantilever support frame 1 to rotate through the first blocking part 5, so as to transfer the rotation to the wind turbine main shaft 6, thereby completing power generation. When the blade 2 rotates to the leeward surface to face the wind along with the cantilever support frame 1, the external air blows the blade 2 open, which eliminates the resistance to the rotation of the wind turbine main shaft 6 when the external wind impacts the leeward surface of the blade 2. In the process that the blade 2 is impacted by the external wind, because the inner arc surface of the arc-shaped plate is arranged windward, the wind blowing to the blade 2 forms, through an arc-shaped streamline structure, a vortex at the arc-shaped structure to produce fluid momentum, which increases a pushing force to the blade 2 according to Newton's third law. In addition, the wind that will escapes from the periphery of the blade 2 originally will also enter the arc-shaped plate to do work to push the cantilever support frame 1 to rotate. Embodiment 2: Referring to FIG. 4, a vertical shaft wind turbine applying a wind turbine propeller is provided. Different from Embodiment 1, the wind turbine main shaft 6, a hub, and an energy conversion system (not shown in the drawings) are further arranged. A plurality of the wind turbine propellers in Embodiment 1 are mounted on the wind turbine main shaft 6. The mounting manner is that the cantilever support frame 1 is connected to the wind turbine main shaft 6 through the hub. The wind turbine main shaft 6 is connected to the energy conversion system, and is used for converting kinetic energy into electrical energy. There are four wind turbine propellers. The four wind turbine propellers are connected to the wind turbine main shaft 6 in a helical structure with a dihedral angle of 90 . When one wind turbine propeller gradually loses the optimal angle of attack of wind, the windward area of the another wind turbine propeller gradually increased to the optimal angle of attack of wind due to a 900 - rotatory design structure and the inertia rotation of the wind turbine main shaft 6, so that the wind turbine can generate power. In the present utility model, the unique helical structure is matched with an opening/closing type blade 2 with the arc-shaped plate, so that normal power generation can be realized no matter the wind is southeast wind or northwest wind, or even turbulent flow. Because of a special aerodynamics principle, the resistance difference on both sides of a rotor can be ensured all the time, so that the wind turbine can rotate normally to generate power, and the power generation amount is large even when the wind speed is low. In an actual use process, the blade 2 with the arc-shaped plate in the wind turbine propeller captures the kinetic energy of the external wind, and drives the wind turbine main shaft 6 to rotate through the cantilever support frame 1, which converts the wind energy into mechanical energy, and then a wind turbine main shaft transmits its own mechanical energy to the energy conversion system to convert the mechanical energy into electrical energy for human to use.

The present utility model adopts a helical structure mode, which is a high-quality structure mode widely existing in animal and plant DNA binding proteins, and solves the mutual influence of the current vertical shaft wind turbine propellers in the same plane when capturing the wind energy. In the present utility model, the blades 2 of one wind turbine propeller can be directly affected by the wind without hindrance, so that the utilization of the wind energy is maximized. Meanwhile, the stepped cyclic structure represented in the helical structure mode can make the wind turbine main shaft 6 obtain stable and continuous pushing force. The present utility model has the inherent advantages of easiness in installation and maintenance, advanced design method, high wind energy utilization rate, low starting wind speed, basically no noise, small rotating space of the blade 2, and the like of a vertical shaft wind turbine, so that the present utility model has a broad market application prospect. The blade 2 is opened downwind and is closed upwind due to its unique design structure. The overall appearance of the design structure of an inward arc-shaped streamline meeting the principle of aerodynamics is attractive and smooth, so that the wind blowing to the blade 2 forms a vortex at the arc-shaped structure to produce fluid momentum, which increases a pushing force to the blade 2 according to Newton's third law. Compared with the existing design of the wind turbine propeller, the wind turbine propeller is the most energy-saving, has high energy utilization rate, and has great promotion value. All adaptive changes made according to actual demands are within the scope of protection of the present utility model. It should be noted that, for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary but not restrictive. The scope of the present utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference numeral in the claims shall not be regarded as limiting the claims involved. Specific examples are used to describe the principle and implementation manners of the present utility model. The description of the embodiments above is merely intended to help understand the method and its core idea of the present utility model. In addition, those of ordinary skill in the art may make modifications based on the idea of the present utility model with respect to the specific implementation manners and the application scope. In conclusion, the contents of the present specification shall not be construed as a limitation to the present utility model.

Claims

1. A wind turbine propeller, comprising a cantilever support frame connected to a wind turbine main shaft, and blades arranged on the cantilever support frame in an opening/closing manner, wherein one end, far away from the wind turbine main shaft, of the blade is rotatably connected to the cantilever support frame; an arc-shaped plate is arranged at the other end of the blade; the inner arc surface of the arc-shaped plate is arranged windward; a first blocking part used for blocking the blade from rotating to the direction of a leeward surface thereof is arranged between the cantilever support frame and the blade.

2. The wind turbine propeller according to claim 1, wherein the inner arc surface of the arc-shaped plate is in smooth transition connection with a windward surface of the blade; the arc-shaped plate and the blade are arranged integrally;

wherein the central angle of the inner arc surface of the arc-shaped plate does not exceed 90;

wherein when the blade is blocked by the first blocking part, the blade sinks into a plane where the cantilever support frame and the wind turbine main shaft are located.

3. The wind turbine propeller according to claim 1, further comprising a second blocking part used for limiting an opening angle of the blade, wherein the second blocking part is arranged between the windward surface of the blade and the cantilever support frame;

wherein a rubber matrix is arranged on the outer wall of each of the first blocking part and the second blocking part.

4. A vertical shaft wind turbine applying the wind turbine propeller according to any one of claims 1 to 3, comprising a wind turbine main shaft, a hub, a plurality of wind turbine propellers, and an energy conversion system, wherein the cantilever support frame is connected to the wind turbine main shaft through the hub, and the wind turbine main shaft is connected to the energy conversion system.

5. The vertical shaft wind turbine according to claim 4, wherein there are four wind turbine propellers; the four wind turbine propellers are connected to the wind turbine main shaft in a helical structure with a dihedral angle of 90 .