Blade structure for wind power generation and wind power generation equipment

Abstract

The utility model provides a blade structure for wind power generation and wind power generation equipment, and relates to the technical field of wind power generation, the blade structure comprises a main blade and an auxiliary blade, the main blade is fixedly connected with a main shaft of the wind power generation equipment, the auxiliary blade is rotatably connected with the main shaft and can rotate around the circumferential direction of the main shaft, and the auxiliary blade and the main blade are distributed along the axial direction of the main shaft. The number of the auxiliary blades is equal to that of the main blades; the positioning structure is connected with the auxiliary blade and is used for positioning the auxiliary blade on the main shaft, so that a set included angle is formed between the extension direction of the auxiliary blade and the extension direction of the main blade; the problems that in the prior art, wind power generation equipment has the high requirement for wind power, and the power generation utilization time is limited within one year are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power generation, and more specifically, relates to a blade structure for wind power generation and a wind power generation device. Background Art

[0002] Wind energy is a clean and renewable energy source with huge application potential and has developed rapidly in recent years.

[0003] The design type level of a wind turbine is specified by parameters such as reference wind speed, average wind speed and turbulence intensity. Different parameters determine different type levels. Different wind farms meet different type levels. The project configuration needs to select wind turbines of the corresponding type level to ensure the safe and efficient operation of the wind turbine. At present, the technical solution of wind turbines usually uses three blades to achieve a balance between mechanical stability and power generation efficiency, and adjusts the attitude of the wind turbine through the yaw system and the pitch system to achieve the best power generation state. The yaw system is a wind-facing device installed on the upper part of the wind turbine nacelle. Its function is to quickly and smoothly align the wind direction when the direction of the wind speed changes, so that the impeller can obtain the maximum wind energy. The pitch system is installed inside the wind turbine and is located in the hub. It controls the power of the unit by changing the angle of rotation of the blades. It is a control and protection device for the wind turbine.

[0004] The East Asian monsoon region is the most famous monsoon region in the world. Its scope includes eastern my country, North Korea, Japan and other places. Since the Pacific Ocean is the largest ocean in the world and Eurasia is the largest continent in the world, East Asia is located between the two. The temperature contrast and seasonal changes between land and sea are particularly significant. In winter, the Siberian high pressure is strong, and the strong northerly wind on its front edge becomes the winter monsoon in East Asia. In summer, the Asian continent is controlled by thermal low pressure, and the Pacific subtropical high pressure extends westward and northward. The southerly wind between high and low pressure becomes the summer monsoon in East Asia. The East Asian monsoon has a great influence on the weather and climate in eastern China, North Korea, Japan and other regions, forming the East Asian monsoon climate with cold and dry winters and hot and rainy summers. Usually, the wind force of the winter monsoon is greater than that of the summer monsoon, which makes wind power generation have significant and regular fluctuations within a year. Due to the limitation of the adjustment capacity of the yaw system and the pitch system, the current wind turbines often cannot reach the cut-in wind speed of the wind turbine when the wind force is small in the summer monsoon. When the wind force is large in the winter monsoon, a lower cut-out wind speed needs to be set for the safety of the wind turbine, which reduces the utilization rate of wind energy. Therefore, it is necessary to design a new wind power generation technology solution under conditions similar to that of the monsoon zone to effectively reduce the cut-in wind speed of the wind turbine and increase the power generation utilization time of the wind turbine. Utility Model Content

[0005] The utility model aims to provide a blade structure for wind power generation in view of the deficiencies in the prior art, so as to solve the problem that the wind power generation equipment in the prior art has high requirements on wind power and has limited power generation time within a year.

[0006] In order to achieve the above object, the utility model provides a blade structure for wind power generation, comprising:

[0007] Main blades and auxiliary blades, wherein the main blades are fixedly connected to the main shaft of the wind power generation equipment, and the auxiliary blades are rotatably connected to the main shaft and can rotate around the circumference of the main shaft. The auxiliary blades and the main blades are distributed along the axial direction of the main shaft, and the number of the auxiliary blades is equal to that of the main blades;

[0008] A positioning structure is connected to the auxiliary blade and is used to position the auxiliary blade on the main shaft so that a set angle is formed between the extension direction of the auxiliary blade and the extension direction of the main blade.

[0009] Optionally, at least three of the main blades and at least three of the auxiliary blades are respectively provided, and at least three of the main blades are evenly distributed on the periphery of the main shaft, and at least three of the auxiliary blades are evenly distributed on the periphery of the main shaft.

[0010] Optionally, the main blades are fixedly connected to the outer circumference of the main shaft through a first annular component, and the auxiliary blades are rotatably sleeved on the outer circumference of the main shaft through a second annular component.

[0011] Optionally, the positioning structure includes a telescopic component and an inserting groove, the inserting groove is provided in the main shaft, the telescopic component is embedded in the second annular component, and the telescopic end of the telescopic component can be inserted into the inserting groove when extended.

[0012] Optionally, when the telescopic end of the telescopic component is inserted into the insertion groove, the extension direction of the auxiliary blade is located on the bisector of the angle formed by the extension directions of two adjacent main blades.

[0013] Optionally, the positioning structure also includes a magnetic attraction component, which includes a magnetic force generating component and a magnetic adsorption component, and the magnetic force generating component and the magnetic adsorption component are respectively arranged on the main blade and the auxiliary blade. The magnetic force generating component can generate magnetic force and can adsorb the magnetic adsorption component to adsorb and fix the auxiliary blade to one side of the main blade, so that the main blade can block the auxiliary blade along the windward direction.

[0014] Optionally, a plurality of the magnetic force generating components are arranged at intervals along the length direction of the main blade, and each of the magnetic force generating components corresponds to one of the magnetic adsorption components on the auxiliary blade.

[0015] Optionally, the length of the secondary blade is smaller than the length of the main blade.

[0016] Optionally, the length of the secondary blade is 80% of the length of the primary blade.

[0017] The utility model also provides a wind power generation device, comprising:

[0018] A wind power generation equipment body, wherein a main shaft is arranged on the top of the wind power generation equipment body;

[0019] The above-mentioned blade structure for wind power generation.

[0020] The utility model provides a blade structure for wind power generation and a wind power generation device, which has the beneficial effects that: the blade structure for wind power generation has main blades and auxiliary blades arranged in sequence along the axial direction of the main shaft, the main blades are fixedly connected to the main shaft, and the auxiliary blades can rotate around the circumference of the main shaft, and can only achieve transmission connection with the main shaft under the positioning action of the positioning structure. Under the action of the positioning structure, the auxiliary blades can be positioned and hidden behind the main blades, which strengthens the main blades, increases the cut-out wind speed of the wind power generation device, and can form an angle relative to the main blades, which is equivalent to increasing the number of blades, doubling the number of blades, reducing the cut-in wind speed of the wind power generation device, expanding the applicable wind speed range of the wind power generation device, and increasing the power generation utilization time within one year.

[0021] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0023] Figure 1 A schematic diagram of the exploded structure of a blade structure for wind power generation in a hidden state of auxiliary blades according to the first embodiment of the utility model is shown.

[0024] Figure 2 A schematic diagram of the exploded structure of a blade structure for wind power generation according to the first embodiment of the utility model is shown in a state where the auxiliary blades are deployed.

[0025] Figure 3 A schematic diagram of the exploded structure of a main blade and a secondary blade of a blade structure for wind power generation according to the first embodiment of the utility model is shown.

[0026] Figure 4A structural schematic diagram of a wind power generation device according to the second embodiment of the utility model is shown.

[0027] Description of reference numerals:

[0028] 1. Wind measuring device; 2. Yaw device; 3. Blade structure for wind power generation; 4. Support device; 3-1. Main blade; 3-2. Auxiliary blade; 3-3. Magnetic attraction component; 3-4. Controller; 3-3-1. Magnetic force generating component; 3-3-2. Magnetic attraction component. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] The utility model provides a blade structure for wind power generation, comprising:

[0031] Main blades and auxiliary blades, the main blades are fixedly connected to the main shaft of the wind power generation equipment, the auxiliary blades are rotatably connected to the main shaft and can rotate around the circumference of the main shaft, the auxiliary blades and the main blades are distributed along the axial direction of the main shaft, and the number of the auxiliary blades is equal to that of the main blades;

[0032] The positioning structure is connected to the auxiliary blade and is used to position the auxiliary blade on the main shaft so that a set angle is formed between the extension direction of the auxiliary blade and the extension direction of the main blade.

[0033] Specifically, in order to solve the problem that the wind power generation equipment in the prior art has high requirements for wind power and the power generation time is limited within a year; the blade structure for wind power generation provided by the utility model has main blades and auxiliary blades arranged in sequence along the axial direction of the main shaft, the main blades are fixedly connected to the main shaft, and the auxiliary blades can rotate around the circumference of the main shaft, and can only achieve transmission connection with the main shaft under the positioning action of the positioning structure. Under the action of the positioning structure, the auxiliary blades can be positioned and hidden behind the main blades, which strengthens the main blades, increases the cut-out wind speed of the wind power generation equipment, and can form an angle relative to the main blades, which is equivalent to increasing the number of blades, doubling the number of blades, reducing the cut-in wind speed of the wind power generation equipment, expanding the applicable wind speed range of the wind power generation equipment, and increasing the power generation time within a year.

[0034] Furthermore, the positioning structure makes the set angle formed between the extension direction of the auxiliary blade and the extension direction of the main blade include at least a first set angle and a second set angle, the first set angle is 0°, and the second set angle is the angle generated between the auxiliary blade and the main blade when the extension direction of the auxiliary blade is on the bisector of the angle between the extension directions of two adjacent main blades.

[0035] Optionally, at least three main blades and at least three auxiliary blades are respectively provided, and at least three main blades are evenly distributed on the outer circumference of the main shaft, and at least three auxiliary blades are evenly distributed on the outer circumference of the main shaft.

[0036] Specifically, the number of main blades and auxiliary blades is the same, which can be three. The three main blades are distributed on the outer circumference of the main shaft along a first circumference, and the three auxiliary blades are distributed on the outer circumference of the main shaft along a second circumference. The second circumference is on the rear side of the first circumference. The auxiliary blades are behind the main blades along the windward direction. When the auxiliary blades are in a hidden state, the auxiliary blades are hidden on the rear side of the main blades and do not play a windward effect. No additional driving force is generated, and they only play a reinforcing effect on the main blades. When the auxiliary blades are in an expanded state, the auxiliary blades rotate a first angle relative to the main blades, play a windward effect, and can drive the main shaft to rotate together with the main blades.

[0037] Optionally, the main blades are fixedly connected to the outer periphery of the main shaft through a first annular component, and the auxiliary blades are rotatably sleeved on the outer periphery of the main shaft through a second annular component.

[0038] Specifically, the first annular component is fixed on the outside of the main shaft, and the second annular component is rotatably connected to the main shaft. An annular rotation groove can be set on the outside of the main shaft, and the second annular component is rotatably embedded in the rotation groove, which has a limiting effect on the second annular component and enables the second annular component to rotate relative to the main shaft.

[0039] Furthermore, for the rotation of the auxiliary blades on the second annular component relative to the main shaft, a rotation driving structure can be set, and the rotation driving structure can be used to actively drive the second annular component to rotate. The rotation driving component can adopt the transmission cooperation of the annular rack and the gear to drive the motor to drive the gear to rotate, and the engagement of the gear with the annular rack connected to the second annular component is used to drive the annular gear and the second annular component to rotate. The rotation driving structure may also not be set. After unlocking the positioning effect of the positioning structure on the auxiliary blades, the auxiliary blades can also form an angle with the main blades by utilizing inertia. When the required angle is reached, the positioning structure can then position the auxiliary blades.

[0040] Optionally, the positioning structure includes a telescopic component and an inserting groove, the inserting groove is provided in the main shaft, the telescopic component is embedded in the second annular component, and the telescopic end of the telescopic component can be inserted into the inserting groove when extended.

[0041] Specifically, the positioning structure can realize the positioning of the second annular component on the main shaft by inserting the telescopic end of the telescopic component into the insertion groove.

[0042] Optionally, when the telescopic end of the telescopic component is inserted into the insertion groove, the extension direction of the auxiliary blade is located on the bisector of the angle formed by the extension directions of two adjacent main blades.

[0043] Specifically, when the auxiliary blade and the second annular component rotate to form a second set angle between the extension direction of the auxiliary blade and the extension direction of the main blade, the telescopic component extends its telescopic end and inserts it into the insertion groove to position the second annular component and the auxiliary blade.

[0044] Optionally, the positioning structure also includes a magnetic attraction component, which includes a magnetic force generating component and a magnetic adsorption component. The magnetic force generating component and the magnetic adsorption component are respectively arranged on the main blade and the auxiliary blade. The magnetic force generating component can generate magnetic force and can adsorb the magnetic adsorption component to adsorb and fix the auxiliary blade to one side of the main blade, so that the main blade can block the auxiliary blade along the windward direction.

[0045] Specifically, for the positioning of the auxiliary blade when it is in a hidden state, a magnetic attraction component can be used, and the magnetic force generating component of the magnetic attraction component is used to adsorb its magnetic adsorption component to achieve a fitting connection between the auxiliary blade and the main blade.

[0046] Optionally, a plurality of magnetic force generating components are arranged at intervals along the length direction of the main blade, and each magnetic force generating component corresponds to a magnetic adsorption component on the auxiliary blade.

[0047] Specifically, the magnetic force generating component and the magnetic adsorption component correspond one to one so that the two can complete magnetic adsorption docking.

[0048] Optionally, the length of the secondary blade is smaller than the length of the primary blade.

[0049] Specifically, the length of the auxiliary blade is smaller than that of the main blade, and can be completely hidden behind the main blade. In addition, when in the unfolded state, the auxiliary blade is pushed by different wind forces.

[0050] Optionally, the length of the secondary blade is 80% of the length of the primary blade.

[0051] The utility model also provides a wind power generation device, comprising:

[0052] A wind power generation equipment body, wherein a main shaft is arranged on the top of the wind power generation equipment body;

[0053] The above-mentioned blade structure for wind power generation.

[0054] Specifically, the wind power generation equipment body is connected to the blade structure for wind power generation through a main shaft. By setting the main blades and auxiliary blades, the range between the cut-in wind speed and the cut-out wind speed of the wind power generation equipment can be reduced, the utilization efficiency of wind energy is improved, and the power generation utilization time within a year is increased.

[0055] Furthermore, a wind measuring device, a yaw device, a supporting device, etc. can also be provided on the wind power generation equipment body. The wind measuring device can measure the wind in real time, and can also receive the weather forecast issued by the observatory to predict the wind direction and wind speed change data, and provide real-time feedback to the yaw device and the controller of the above-mentioned blade structure for wind power generation; the yaw device receives the signal of the wind measuring device in real time to ensure that the nose of the wind power generation equipment body is 180° with the incoming wind direction, ensuring its windward effect; the controller can control the state switching of the auxiliary blades, and can be set at the root position of the main blades.

[0056] Embodiment 1

[0057] like Figure 1 and Figure 2 As shown, the utility model provides a blade structure for wind power generation, comprising:

[0058] The main blades 3-1 and the auxiliary blades 3-2, the main blades 3-1 are fixedly connected to the main shaft of the wind power generation equipment, the auxiliary blades 3-2 are rotatably connected to the main shaft and can rotate around the circumference of the main shaft, the auxiliary blades 3-2 and the main blades 3-1 are distributed along the axial direction of the main shaft, and the number of the auxiliary blades 3-2 and the main blades 3-1 is equal;

[0059] The positioning structure is connected to the auxiliary blade 3-2 and is used to position the auxiliary blade 3-2 on the main shaft so that a set angle is formed between the extension direction of the auxiliary blade 3-2 and the extension direction of the main blade 3-1.

[0060] Optionally, at least three main blades 3-1 and at least three auxiliary blades 3-2 are respectively provided, at least three main blades 3-1 are evenly distributed on the periphery of the main shaft, and at least three auxiliary blades 3-2 are evenly distributed on the periphery of the main shaft.

[0061] In this embodiment, three main blades 3 - 1 and three auxiliary blades 3 - 2 are respectively provided.

[0062] Optionally, the main blade 3 - 1 is fixedly connected to the outer periphery of the main shaft through a first annular component, and the auxiliary blade 3 - 2 is rotatably sleeved on the outer periphery of the main shaft through a second annular component.

[0063] Optionally, the positioning structure includes a telescopic component and an inserting groove, the inserting groove is provided in the main shaft, the telescopic component is embedded in the second annular component, and the telescopic end of the telescopic component can be inserted into the inserting groove when extended.

[0064] Optionally, when the telescopic end of the telescopic component is inserted into the insertion groove, the extension direction of the auxiliary blade 3-2 is located on the bisector of the angle formed by the extension directions of two adjacent main blades 3-1.

[0065] Optionally, the positioning structure also includes a magnetic attraction component 3-3, the magnetic attraction component 3-3 includes a magnetic force generating component 3-3-1 and a magnetic adsorption component 3-3-2, the magnetic force generating component 3-3-1 and the magnetic adsorption component 3-3-2 are respectively arranged on the main blade 3-1 and the auxiliary blade 3-2, the magnetic force generating component 3-3-1 can generate magnetic force and can adsorb the magnetic adsorption component 3-3-2 to adsorb and fix the auxiliary blade 3-2 on one side of the main blade 3-1, so that the main blade 3-1 can block the auxiliary blade 3-2 along the windward direction.

[0066] In this embodiment, if Figure 1 As shown, when the auxiliary blade 3-2 is in the hidden state, the magnetic force generating component 3-3-1 adsorbs the magnetic adsorption component 3-3-2, so that the auxiliary blade 3-2 is attached to the rear side of the main blade 3-1, which strengthens the main blade 3-1; Figure 2 As shown, when the auxiliary blade 3-2 is in the unfolded state, the magnetic force generating component 3-3-1 releases the adsorption of the magnetic adsorption component 3-3-2, the auxiliary blade 3-2 is unfolded, and the telescopic end of the telescopic component extends out and inserts into the plug-in slot at its unfolded angle state to position the auxiliary blade 3-2.

[0067] In this embodiment, the magnetic force generating component 3-3-1 is an electromagnet, which generates magnetic force after being powered on and can adsorb the magnetic adsorption component 3-3-2 that can be adsorbed by the magnetic force. The magnetic adsorption component 3-3-2 can be an iron part.

[0068] Optionally, a plurality of magnetic force generating components 3-3-1 are arranged at intervals along the length direction of the main blade 3-1, and each magnetic force generating component 3-3-1 corresponds to a magnetic adsorption component 3-3-2 on the auxiliary blade 3-2.

[0069] In this embodiment, if Figure 3 As shown, four magnetic force generating components 3-3-1 are arranged at intervals on each main blade 3-1, and correspondingly, four magnetic adsorption components 3-3-2 are arranged at intervals on each auxiliary blade 3-2, and there is also a controller 3-4. The controller 3-4 is used to control the start and stop of the magnetic force generating component 3-3-1 and the telescopic component, and can also be connected to the angle measuring component. The angle measuring component is used to measure the rotation angle of the second annular component so as to control the telescopic end of the telescopic component to extend when the auxiliary blade 3-2 is in the expanded state, thereby realizing the positioning of the auxiliary blade 3-2.

[0070] Optionally, the length of the auxiliary blade 3 - 2 is smaller than the length of the main blade 3 - 1 .

[0071] Optionally, the length of the auxiliary blade 3 - 2 is 80% of the length of the main blade 3 - 1 .

[0072] In this embodiment, the magnetic force generating component 3-3-1 and the magnetic adsorption component 3-3-2 are respectively embedded in the main blade 3-1 and the auxiliary blade 3-2 to maintain the appearance and surface state of the main blade 3-1 and the auxiliary blade 3-2.

[0073] Embodiment 2

[0074] like Figure 4 As shown, the utility model also provides a wind power generation device, comprising:

[0075] A wind power generation equipment body, wherein a main shaft is arranged on the top of the wind power generation equipment body;

[0076] The above-mentioned blade structure 3 for wind power generation.

[0077] In this embodiment, the wind power generation equipment body is also provided with a wind measuring device 1, a yaw device 2, a support device 4, etc. The wind measuring device 1 measures the wind direction and wind speed changes in real time, and feeds back to the yaw device 2 and the controller 3-4 of the blade structure 3 for wind power generation in real time; the yaw device 2 receives the signal of the wind measuring device 1 in real time to ensure that the head of the wind power generation equipment body is 180° with the incoming wind direction, so as to ensure its windward effect. When in use, when the yaw device 2 ensures that the head of the wind power generation equipment body is 180° with the incoming wind direction, when the wind speed is less than V1 (V1=1.8 m / s), the controller 3-4 controls the magnetic force generating component 3-3-1 to stop, and makes the secondary blade 3-2 unfold; when the wind speed is greater than V2 (V2=18 m / s), the controller 3-4 controls the telescopic end of the telescopic component to retract, and controls the magnetic force generating component 3-3-1 to start, and the secondary blade 3-2 is attached to the main blade 3-1.

[0078] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A blade structure for wind power generation, characterized in that: include: Main blades and auxiliary blades, wherein the main blades are fixedly connected to the main shaft of the wind power generation equipment, and the auxiliary blades are rotatably connected to the main shaft and can rotate around the circumference of the main shaft. The auxiliary blades and the main blades are distributed along the axial direction of the main shaft, and the number of the auxiliary blades is equal to that of the main blades; A positioning structure is connected to the auxiliary blade and is used to position the auxiliary blade on the main shaft so that a set angle is formed between the extension direction of the auxiliary blade and the extension direction of the main blade.

2. The blade structure for wind power generation according to claim 1, characterized in that: At least three of the main blades and the auxiliary blades are respectively provided, and at least three of the main blades are evenly distributed on the outer circumference of the main shaft, and at least three of the auxiliary blades are evenly distributed on the outer circumference of the main shaft.

3. The blade structure for wind power generation according to claim 1, characterized in that: The main blade is fixedly connected to the outer periphery of the main shaft through a first annular component, and the auxiliary blade is rotatably sleeved on the outer periphery of the main shaft through a second annular component.

4. The blade structure for wind power generation according to claim 3, characterized in that: The positioning structure includes a telescopic component and an inserting groove, wherein the inserting groove is arranged in the main shaft, the telescopic component is embedded in the second annular component, and the telescopic end of the telescopic component can be inserted into the inserting groove when extended.

5. The blade structure for wind power generation according to claim 4, characterized in that: When the telescopic end of the telescopic component is inserted into the inserting groove, the extension direction of the auxiliary blade is located on the bisector of the angle formed by the extension directions of two adjacent main blades.

6. The blade structure for wind power generation according to claim 5, characterized in that: The positioning structure also includes a magnetic attraction component, which includes a magnetic force generating component and a magnetic adsorption component. The magnetic force generating component and the magnetic adsorption component are respectively arranged on the main blade and the auxiliary blade. The magnetic force generating component can generate magnetic force and can adsorb the magnetic adsorption component to adsorb and fix the auxiliary blade to one side of the main blade, so that the main blade can block the auxiliary blade along the windward direction.

7. The blade structure for wind power generation according to claim 6, characterized in that: A plurality of magnetic force generating components are arranged at intervals along the length direction of the main blade, and each of the magnetic force generating components corresponds to one of the magnetic adsorption components on the auxiliary blade.

8. The blade structure for wind power generation according to claim 1, characterized in that: The length of the auxiliary blade is smaller than the length of the main blade.

9. The blade structure for wind power generation according to claim 8, characterized in that: The length of the auxiliary blade is 80% of the length of the main blade.

10. A wind power generation device, characterized in that: include: A wind power generation equipment body, wherein a main shaft is arranged on the top of the wind power generation equipment body; A blade structure for wind power generation according to any one of claims 1 to 9.

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