Device for enhancing power generation efficiency of wind turbine

Abstract

The utility model discloses a power generation efficiency enhancing device of a wind power turbine, which comprises a vertical axis wind driven generator, a connecting piece and a counterweight piece, and the vertical axis wind driven generator comprises blades. The counterweight piece is hung on the blade of the vertical axis wind turbine through the connecting piece, and the counterweight piece can swing relative to the blade. According to the power generation efficiency enhancing device of the wind power turbine, the balance weight piece and the connecting piece are additionally arranged, the balance weight piece is hung on the blade of the vertical axis wind turbine through the connecting piece, and the balance weight piece can swing relative to the blade. When the wind speed is reduced, the inertia of the counterweight piece capable of swinging relative to the blades can apply force with the same rotating direction to the blades of the vertical-axis wind driven generator, so that the speed of reducing the rotating speed of the blades of the vertical-axis wind driven generator is slowed down, energy waste is reduced, and the power generation efficiency of the vertical-axis wind driven generator is improved when the wind speed is reduced.

Description

Technical Field

[0001] The utility model relates to the field of wind turbines, in particular to a device for enhancing the power generation efficiency of a wind turbine. Background Art

[0002] Compared with horizontal axis wind turbines, vertical axis wind turbines have advantages such as low noise, high wind energy utilization rate and low starting wind speed. In the prior art, vertical axis wind turbines are mainly divided into two categories: resistance type and lift type. Resistance type vertical axis wind turbines mainly use the resistance difference generated by air flowing through the blades as the driving force, while lift type uses the lift generated by air flowing through the blades as the driving force. Since the resistance decreases sharply with the increase of the rotation speed during the rotation of the blades, while the lift increases instead, the efficiency of the lift type vertical axis wind turbine is much higher than that of the resistance type. However, at present, both resistance type and lift type vertical axis wind turbines generally have the following disadvantages: small starting torque, complex structure, and in strong winds, the windward area and force of the wind wheel are large, which makes the generator output power too large, which easily causes the motor to exceed the rated power generation and be damaged.

[0003] The general solution at present is to set a friction or speed limiting device on the rotating shaft. This method makes the generator easy to wear, unstable, and the structure is complicated and difficult to implement universally. Another solution is to set a spring variable pitch device to increase the rotational resistance by changing the direction of the fan blades to achieve the purpose of speed limiting. However, the speed limiting method will waste energy. Utility Model Content

[0004] The utility model provides a wind turbine power generation efficiency enhancement device, which aims to solve the problem in the prior art that speed limitation leads to energy waste of the vertical axis wind turbine.

[0005] The utility model discloses a wind turbine power generation efficiency enhancement device, comprising a vertical axis wind generator, a connecting piece and a counterweight. The vertical axis wind generator comprises blades. The counterweight is suspended on the blades of the vertical axis wind generator through the connecting piece, and the counterweight can swing relative to the blades.

[0006] In some embodiments, the connecting member is a longitudinal and flexible connecting member, one end of the connecting member is connected to the counterweight, and the other end of the connecting member is connected to the blade.

[0007] In some embodiments, the connecting member is a steel cable.

[0008] In some embodiments, the number of the blades is at least two, and each of the blades is connected to a counterweight via a connecting member.

[0009] In some embodiments, the sum of the lengths of any two of the connecting members and the maximum dimensions of the cross-sections of any two of the counterweight members is smaller than the distance between any two of the blades.

[0010] In some embodiments, the counterweight is a small gravity ball or a flat gravity disc.

[0011] In some embodiments, the wind turbine power generation efficiency enhancement device further includes a safety cable, wherein the safety cable connects the blade and the counterweight, and the length of the safety cable is greater than the length of the connecting member.

[0012] In some embodiments, the vertical axis wind turbine further includes a vertically arranged main shaft, a supporting wing, a driving device and a control device, one end of the supporting wing is connected to the main shaft, and the other end of the supporting wing is connected to the blade; the driving device is connected to the main shaft, and the control device is electrically connected to the driving device.

[0013] In some embodiments, the vertical axis wind turbine further comprises a wind speed detector, wherein the wind speed detector is disposed on the main shaft and is electrically connected to the control device.

[0014] In some embodiments, the vertical axis wind turbine further includes a tension monitor, wherein the tension monitor is disposed on the safety cable and is electrically connected to the control device.

[0015] Compared with the prior art, the wind turbine power generation efficiency enhancement device disclosed in the utility model has the following beneficial effects: by additionally providing a counterweight and a connecting member, the counterweight is suspended on the blades of the vertical axis wind turbine through the connecting member, and the counterweight can swing relative to the blades. When the wind speed decreases, the inertia of the counterweight that can swing relative to the blades will apply a force in the same direction of rotation to the blades of the vertical axis wind turbine, thereby slowing down the speed at which the blades of the vertical axis wind turbine rotate, reducing energy waste, and improving the power generation efficiency of the vertical axis wind turbine when the wind speed decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A side view of a device for enhancing power generation efficiency of a wind turbine provided by a first embodiment of the utility model;

[0018] Figure 2 A side view of a device for enhancing power generation efficiency of a wind turbine provided by a second embodiment of the utility model;

[0019] Figure 3 A schematic block diagram of a vertical axis wind turbine generator of a wind turbine power generation efficiency enhancement device provided in a second embodiment of the utility model.

[0020] Reference numerals: vertical axis wind turbine 1; main shaft 11; supporting wing 12; blade 13; wind speed detector 14; driving device 15; control device 16; tension monitor 17; braking device 18; connecting part 2; counterweight 3; safety cable 4. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0023] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0024] It should be further understood that the terms “and, or” used in the present specification and the appended claims refer to any combination and all possible combinations of one or more of the associated listed items, and include these combinations.

[0025] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

[0026] First embodiment:

[0027] The first embodiment of the utility model discloses a wind turbine power generation efficiency enhancement device, which is applied to the field of wind power generation, such as Figure 1 As shown, the wind turbine power generation efficiency enhancement device includes a vertical axis wind turbine 1, a connecting member 2, a counterweight 3 and a safety cable 4. The counterweight 3 is suspended on the blades 13 of the vertical axis wind turbine 1 through the connecting member 2, and the counterweight 3 can swing relative to the blades 13 of the vertical axis wind turbine 1. When the blades 13 rotate, the counterweight 3 can be driven to rotate around the axis of the vertical axis wind turbine 1. When the vertical axis wind turbine 1 works under high wind speed conditions, due to the existence of the counterweight 3, the weight of the blades 13 is indirectly increased, and the vertical axis wind turbine 1 is not easy to reach a dangerous output power, that is, the upper limit of the wind speed at which the vertical axis wind turbine 1 reaches a dangerous output power is increased, thereby improving the safety of the vertical axis wind turbine 1 working under high wind speed conditions. Furthermore, when the wind speed decreases, the inertia of the counterweight 3 will apply a force in the same direction of rotation to the blades 13 of the vertical axis wind turbine 1, thereby slowing down the speed at which the rotation speed of the blades 13 of the vertical axis wind turbine 1 decreases, reducing energy waste, and further improving the power generation efficiency of the vertical axis wind turbine 1 when the wind speed decreases, and improving the power generation stability of the vertical axis wind turbine 1. The safety cable 4 connects the blade 13 and the counterweight 3. If the connector 2 breaks in an accident or the connection between the connector 2 and the blade 13 or the counterweight 3 is released, the safety cable 4 still connects the blade 13 and the counterweight 3 to prevent the counterweight 3 from falling; and the length of the safety cable 4 is greater than the length of the connector 2. When the connection between the connector 2 and the blade 13 or the counterweight 3 is normal or the connector 2 is not broken, the safety cable 4 itself is not subject to tension.

[0028] The vertical axis wind turbine 1 may include a main shaft 11, a supporting wing 12 and a blade 13. The main shaft 11 is arranged vertically. The supporting wing 12 is arranged on the circumference of the main shaft 11, and one end of the supporting wing 12 is connected to the main shaft 11, and the other end of the supporting wing 12 is connected to the blade 13. The blade 13 is also arranged vertically.

[0029] Preferably, the connecting member 2 may be a longitudinal flexible connecting member 2, specifically a steel cable, one end of which is fixedly connected to the bottom of the blade 13 of the vertical axis wind turbine 1, and the other end of which is fixedly connected to the counterweight 3, so that the counterweight 3 is vertically suspended below the blade 13 of the vertical axis wind turbine 1, and the counterweight 3 can swing relative to the blade 13 of the vertical axis wind turbine 1. The two ends of the steel cable may also be movably connected to the blade 13 or the counterweight 3, for example, a lifting ring is provided on the blade 13 and the counterweight 3, and the steel cable cooperates with the lifting ring to form a connection between the steel cable and the blade 13 or the counterweight 3.

[0030] It can be understood that the connecting member 2 can also be a longitudinal rigid connecting member 2, specifically a connecting rod with a smaller diameter, one end of which is movably connected to the bottom of the blade 13 of the vertical-axis wind turbine 1, for example, by means of a hinge or a hook and a through hole, and the other end is fixedly connected to the counterweight 3 so that the counterweight 3 is vertically suspended below the blade 13 of the vertical-axis wind turbine 1, thereby allowing the counterweight 3 to swing relative to the blade 13 of the vertical-axis wind turbine 1.

[0031] The counterweight 3 can be a gravity ball or a gravity flat disc. When the counterweight 3 is a gravity flat disc, the air resistance of the counterweight 3 can be further reduced. The vertical axis wind turbine 1 has at least two blades 13, preferably three, and each blade 13 is connected to a gravity ball or a gravity flat disc through a connector 2. And the sum of the lengths of any two connectors 2 and the maximum dimensions of the cross-sections of the two counterweights 3 is less than the distance between any two blades 13, so as to prevent the counterweight 3 from colliding or getting entangled when the connector 2 is a flexible connector 2. Similarly, the sum of the lengths of any two safety cables 4 and the maximum dimensions of the cross-sections of the two counterweights 3 is less than the distance between any two blades 13, or the sum of the length of any one safety cable 4 and the maximum dimension of the cross-section of any one counterweight 3 is less than the distance between any two blades 13. The maximum dimension of the cross-section of the counterweight 3 is the diameter of the gravity ball or the gravity flat disc. The length of the connecting member 2 also controls the height of the counterweight 3 above three meters from the ground, and should avoid collision with buildings around the vertical axis wind turbine 1.

[0032] The counterweight 3 and the main shaft 11 of the vertical axis wind turbine 1 have the same magnetic properties. When the blades 13 rotate to the point where they are about to stop, the inertia of the counterweight 3 will cause it to swing greatly relative to the blades 13. The counterweight 3 and the main shaft 11 of the vertical axis wind turbine 1 have the same magnetic properties, which can prevent the counterweight 3 and the main shaft 11 from colliding to a certain extent. The outside of the counterweight 3 can be wrapped with flexible plastic to further reduce the damage caused by the collision between the counterweights 3 or the collision between the counterweight 3 and other structures. The mass ratio of each counterweight 3 to the blade 13 connected to it can be set to 10% to 50%. If the mass of the counterweight 3 is too large, it may increase the minimum wind speed required for the rotation of the blades 13 of the vertical axis wind turbine 1. If the mass of the counterweight 3 is too small, its inertia is not enough to slow down the speed at which the rotation speed of the blades 13 decreases.

[0033] Second embodiment:

[0034] The second embodiment of the utility model discloses a device for enhancing the power generation efficiency of a wind turbine, such as Figure 2As shown, the wind turbine power generation efficiency enhancement device may include a vertical axis wind turbine 1, a counterweight 3, a connecting member 2 and a safety cable 4. The connection method and function of the counterweight 3, the connecting member 2 and the safety cable 4 in the second embodiment are the same as those in the first embodiment and will not be repeated here.

[0035] Combination Figure 2 and Figure 3 The difference between the second embodiment and the first embodiment is that the vertical axis wind turbine 1 in the second embodiment includes not only the main shaft 11, the support wing 12 and the blade 13, but also a wind speed detector 14, a driving device 15, a control device 16, a tension monitor 17 and a brake device 18. The wind speed detector 14 can be arranged at the top of the main shaft 11, and is used to detect the real-time wind speed of the location of the vertical axis wind turbine 1. The wind speed detector 14 is also electrically connected to the control device 16, the control device 16 is electrically connected to the driving device 15, and the driving device 15 is connected to the main shaft 11. The tension monitor 17 can be arranged on the safety cable 4, and the tension monitor 17 is electrically connected to the control device 16, and is used to monitor the tension of the safety cable 4, and can send out an alarm message. The brake device 18 is electrically connected to the control device 16, and the brake device 18 is also connected to the main shaft 11.

[0036] Specifically, the vertical axis wind turbine 1 can preset a first starting wind speed and a second starting wind speed, wherein the first starting wind speed is greater than the second starting wind speed. The first starting wind speed is an environmental wind speed sufficient to drive the blades 13 from stationary to rotating and maintaining rotation; the second starting wind speed is an environmental wind speed that is insufficient to drive the blades 13 to rotate from stationary, but can keep the blades 13 rotating after the blades 13 start rotating. When the wind speed detector 14 detects that the environmental real-time wind speed is greater than or equal to the first starting wind speed, the wind speed detector 14 sends information that the environmental real-time wind speed meets the first starting wind speed to the control device 16. If the control device 16 receives the information that the real-time wind speed sent by the wind speed detector 14 meets the first starting wind speed, it sends a message prohibiting startup to the driving device 15. In this case, the vertical axis wind turbine 1 is in a natural starting mode that relies on the environmental real-time wind speed to drive the blades 13 from stationary to maintain rotation.

[0037] When the wind speed detector 14 detects that the real-time wind speed of the environment is less than the first start-up wind speed, but greater than or equal to the second start-up wind speed, the wind speed detector 14 sends information to the control device 16 that the real-time wind speed of the environment does not meet the first start-up wind speed but meets the second start-up wind speed. If the control device 16 receives the information that the real-time wind speed sent by the real-time wind speed detector 14 of the environment does not meet the first start-up wind speed but meets the second start-up wind speed, it sends auxiliary start information to the drive device 15. When the drive device 15 receives the auxiliary start information sent by the control device 16, it drives the main shaft 11 to rotate and drives the blade 13 to rotate from rest. After the blade 13 rotates, the blade 13 can continue to rotate with the help of the wind force of the real-time wind speed of the environment, and the control device 16 sends a shutdown message to the drive device 15, wherein a sensor can be set on the blade 13, the sensor is electrically connected to the control device 16, and the sensor is used to send information to the control device 16 whether the blade 13 starts to rotate. When the drive device 15 receives the shutdown information sent by the control device 16, it stops driving the main shaft 11. In this case, the vertical axis wind turbine 1 is in an auxiliary starting mode in which the driving device 15 first drives the blades 13 to rotate, and after the blades 13 have an initial rotation speed, the blades 13 are kept rotating by the environmental wind force. This working mode can effectively reduce the requirements of the vertical axis wind turbine 1 for the real-time wind speed of the environment, thereby increasing the working time of wind power generation and increasing the power generation.

[0038] When the wind speed detector 14 detects that the real-time wind speed is less than the second starting wind speed, it means that the wind speed at the location of the vertical axis wind turbine 1 is insufficient to provide the wind power required for wind power generation, and the wind speed detector 14 does not send the relevant startup information to the control device 16.

[0039] Specifically, when the tension monitor 17 detects that the tension on the safety cable 4 suddenly increases significantly, indicating that an unexpected situation such as the breakage of the connector 2, the disconnection between the connector 2 and the blade 13, or the disconnection between the connector 2 and the counterweight 3 has occurred, the tension monitor 17 sends information about the sudden unexpected situation to the control device 16. When the control device 16 receives the information about the sudden unexpected situation sent by the tension monitor 17, it sends an alarm message to the corresponding alarm device to control the alarm device to send an alarm signal, thereby reminding the relevant staff to repair as soon as possible and take corresponding safety protection measures. The alarm signal can be at least one of a sound alarm signal, a light alarm signal, and a vibration alarm signal. When the control device 16 receives the information about the sudden unexpected situation sent by the tension monitor 17, it also sends an emergency braking message to the brake device 18. After receiving the emergency braking message sent by the control device 16, the brake device 18 immediately brakes the main shaft 11, thereby stopping the rotation of the blade 13. The control device 16 may send the emergency braking information to the braking device 18 before the alarm device sends the alarm information, or may send the emergency braking information and the alarm information at the same time, so as to avoid the blade 13 rotating and driving the broken connecting part 2 to rotate and cause further damage before the staff takes maintenance measures.

[0040] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A wind turbine power generation efficiency enhancement device, characterized in that: The invention comprises a vertical axis wind generator, a connecting member and a counterweight. The vertical axis wind generator comprises blades. The counterweight is suspended on the blades of the vertical axis wind generator through the connecting member. The counterweight can swing relative to the blades.

2. The wind turbine power generation efficiency enhancement device according to claim 1, characterized in that: The connecting member is a longitudinal and flexible connecting member, one end of which is connected to the counterweight member, and the other end of which is connected to the blade.

3. The wind turbine power generation efficiency enhancement device according to claim 2, characterized in that: The connecting piece is a steel cable.

4. The wind turbine power generation efficiency enhancement device according to claim 1, characterized in that: At least two blades are provided, and each blade is connected to a counterweight via a connecting member.

5. The wind turbine power generation efficiency enhancement device according to claim 4, characterized in that: The sum of the length of any two of the connecting members and the maximum size of the cross-section of any two of the counterweight members is smaller than the distance between any two of the blades.

6. The wind turbine power generation efficiency enhancement device according to claim 1, characterized in that: The counterweight is a small gravity ball or a flat gravity plate.

7. The wind turbine power generation efficiency enhancement device according to any one of claims 1 to 6, characterized in that: The wind turbine power generation efficiency enhancement device further includes a safety cable, which connects the blade and the counterweight, and the length of the safety cable is greater than the length of the connecting member.

8. The wind turbine power generation efficiency enhancement device according to claim 7, characterized in that: The vertical axis wind turbine also includes a vertically arranged main shaft, a supporting wing, a driving device and a control device, one end of the supporting wing is connected to the main shaft, and the other end of the supporting wing is connected to the blade; The driving device is connected to the main shaft, and the control device is electrically connected to the driving device.

9. The wind turbine power generation efficiency enhancement device according to claim 8, characterized in that: The vertical axis wind turbine further comprises a wind speed detector, which is arranged on the main shaft and is electrically connected to the control device.

10. The wind turbine power generation efficiency enhancement device according to claim 8, characterized in that: The vertical axis wind turbine further comprises a tension monitor, which is arranged on the safety cable and is electrically connected to the control device.

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