A new type of wind turbine with a built-in linear reciprocating generator in the wind turbine blades

Abstract

The present invention relates to the field of wind power generation technology, and specifically to a novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade, which includes a blade, a guide rail and a limit assembly. During the rotation of the blade, a mover slides on the guide rail, and has a first path and a second path when the mover slides along the guide rail. According to the stator set on the guide rail, the mover passes through the stator when moving on the guide rail in the first path. At this time, the mover can cut the magnetic flux lines generated by the stator and generate an induced electromotive force, thereby generating electricity. The end of the first path of the mover is the starting end of the second path, and the end of the second path of the mover is the starting end of the first path. Under the action of the limit assembly, the mover is restricted to run in a preset manner on the track, ensuring that the mover can continue to run on the guide rail when the blade rotates, thereby making full use of the mechanical energy generated by the blade during rotation.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a novel wind power generator set with a built-in linear reciprocating generator in a wind turbine blade. Background Art

[0002] The wind power industry is rapidly developing, with installed capacity continuing to increase. This has led to a corresponding increase in blade length and volume. Besides the webs that enhance structural strength, blades also have ample free space within them. The Bates theory proposes a wind turbine wind energy utilization limit of approximately 59.3%. This theory primarily relies on the fact that incoming wind speed decreases as it passes through the rotor, converting the lost velocity of the wind into rotor speed. However, due to natural constraints, this conversion limit exists. The mechanical energy generated by blade rotation, in addition to driving the generator in the nacelle, remains underutilized within the narrow blade cavity. As the wind blows, the blade tip rotates in a regular pattern, moving from its highest point at 12 o'clock to its lowest point at 6 o'clock. Blades are typically tens or even hundreds of meters long. Therefore, a significant amount of gravitational potential energy and kinetic energy are converted back and forth during blade rotation. Existing wind turbines are unable to effectively utilize this conversion. Summary of the Invention

[0003] The present invention provides a novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade, so as to solve the problem that existing wind turbine equipment cannot effectively convert the gravitational potential energy and kinetic energy generated by the blades during rotation into each other.

[0004] The novel wind turbine generator set of the present invention, which has a built-in linear reciprocating generator in the wind turbine blade, adopts the following technical solutions:

[0005] A novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade comprises a blade, a guide rail and a limit assembly.

[0006] The inside of the blade is hollow; the guide rail is fixedly arranged inside the blade, and a stator is arranged on the guide rail. A mover that can slide along the guide rail is arranged on the guide rail, and the mover has a first path and a second path when sliding on the guide rail. The stator is arranged on the first path, and the mover passes through the stator when moving on the guide rail in the first path. The end of the first path of the mover is the starting end of the second path, and the end of the second path of the mover is the starting end of the first path; the limit assembly is used to limit the mover to operate in a preset manner on the guide rail when the blade rotates to drive the mover to slide on the guide rail.

[0007] Furthermore, the limiting component is a one-way pulley, which can only rotate in one direction, and the one-way pulley is arranged between the guide rail and the mover.

[0008] Furthermore, a web is provided inside the blade, the web is used to support the blade, and the guide rail is provided on the web.

[0009] Furthermore, the guide rail includes two straight segments and two connecting loops, which form a ring structure. The stator is installed on one of the straight segments. The first path of the mover sliding on the guide rail is that the mover moves on the straight segment where the stator is provided.

[0010] Furthermore, when the blades rotate, the straight section where the stator is installed is located at the front side of the blades' rotation direction.

[0011] Furthermore, the centrifugal force on the mover is smaller than the weight of the mover itself.

[0012] Furthermore, the centrifugal force of the mover plus the weight of the mover itself is greater than the resistance of the magnetic field generated by the stator to the mover.

[0013] Furthermore, when the mover slides on the guide rail along the second path, it is not subject to magnetic field resistance generated by the stator.

[0014] Furthermore, the position of the mover on the guide rail can be adjusted. When the blade is stationary, the mover is on the connection loop of the guide rail close to the blade shaft. When the blade starts, the mover moves to the connection loop of the guide rail away from the blade shaft.

[0015] The beneficial effects of the present invention are as follows: a novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade includes blades, guide rails, and a limit assembly. In the wind turbine, the blades are mounted on the generator main shaft. When the blades are blown by the flowing wind, the blades drive the generator main shaft to rotate, thereby enabling the generator to generate electricity. During the rotation of the blades, the direction of the blades constantly changes. At the same time, the mover slides on the guide rail. When the mover slides along the guide rail, there are a first path and a second path. According to the stator arranged on the guide rail, when the mover moves along the guide rail in the first path, it passes through the stator. At this time, the mover can cut the magnetic flux lines generated by the stator and generate an induced electromotive force, thereby generating electricity. According to the arrangement of the guide rail, the end of the mover's first path is the starting end of the second path, and the end of the mover's second path is the starting end of the first path. Under the action of the limit assembly, the mover is restricted to run in a preset manner on the track, ensuring that the mover can continue to run on the guide rail when the blades rotate, thereby fully utilizing the mechanical energy generated by the blades during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of a novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade, provided by an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a blade in a novel wind turbine generator set with a built-in linear reciprocating generator in the wind turbine blade provided by an embodiment of the present invention;

[0019] Figure 3 A partial schematic diagram of the connection between the web and the guide rail in a novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade provided by an embodiment of the present invention.

[0020] In the figure: 110, blade; 111, blade root; 112, blade tip; 210, stator; 220, mover; 230, connecting circuit; 240, web; 300, guide rail. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0023] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] like Figures 1 to 3 As shown, an embodiment of the present invention provides a novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade, including a blade 110, a guide rail 300 and a limit assembly.

[0025] The blade 110 is hollow inside, and the hollow blade 110 can reduce the weight of the blade 110 and facilitate the flowing wind to blow the blade 110.

[0026] The guide rail 300 is fixedly arranged inside the blade 110. The guide rail 300 is provided with a stator 210. The stator 210 is a block-shaped structure composed of multiple magnetic blocks adsorbed in sequence. The stator 210 can generate magnetic flux lines on the guide rail 300. The guide rail 300 is provided with a mover 220 that can slide along the guide rail 300. The mover 220 has a first path and a second path when sliding on the guide rail 300. The stator 210 is arranged on the first path. When the mover 220 moves on the guide rail 300 in the first path, it passes through the stator 210. When the mover 220 moves on the guide rail 300 in the second path, it does not pass through the stator 210. When the mover 220 moves on the guide rail 300 in the first path, the mover 220 can cut the magnetic flux lines generated by the stator 210 and generate an induced electromotive force. Therefore, the mover 220 can generate electricity when moving on the guide rail 300 in the first path. In this embodiment, when the blade 110 rotates, gravitational potential energy and kinetic energy are converted to each other. By arranging the mover 220 inside the blade 110, it is ensured that the mover 220 can slide on the guide rail 300 inside the blade 110 when the blade 110 rotates. The end of the first path of the mover 220 is the starting end of the second path, and the end of the second path of the mover 220 is the starting end of the first path. When the mover 220 moves on the guide rail 300 along the second path, the mover 220 is mainly used for resetting, ensuring that the mover 220 can circulate on the guide rail 300, thereby ensuring that the mover 220 can continuously cut the magnetic flux lines of the stator 210. The limit assembly is used to limit the mover 220 from running in a preset manner on the guide rail 300 when the blade 110 rotates to drive the mover 220 to slide on the guide rail 300. In a specific setting, the limit assembly limits the mover 220 from moving on the track again along the second path after finishing running on the track along the first path, thereby preventing the mover 220 from repeatedly running on the track along the first path.

[0027] The present invention provides a new type of wind turbine generator set with a linear reciprocating generator built into the wind turbine blade. In the wind turbine, the blade 110 is installed on the generator main shaft. When the blade 110 is blown by the flowing wind, the blade 110 drives the generator main shaft to rotate, thereby enabling the generator to generate electricity. During the rotation of the blade 110, the direction of the blade 110 always changes, and the mover 220 slides on the guide rail 300. When the mover 220 slides along the guide rail 300, it has a first path and a second path respectively. According to the stator 210 set on the guide rail 300, the mover 220 passes through the stator 210 when moving in the first path on the guide rail 300. At this time, the mover 220 can cut the magnetic flux lines generated by the stator 210 and generate an induced electromotive force, thereby generating electricity. According to the setting of the movement path of the mover 220 on the guide rail 300, the end of the first path of the mover 220 is the starting end of the second path, and the end of the second path of the mover 220 is the starting end of the first path. Under the action of the limit assembly, the mover 220 is restricted to run in a preset manner on the track, ensuring that when the blade 110 rotates, the mover 220 can continue to circulate on the guide rail 300, so that the mechanical energy generated by the blade 110 during the rotation process can be fully utilized.

[0028] In one embodiment, the limiting assembly is a one-way pulley that can rotate in only one direction and is disposed between the guide rail 300 and the mover 220. In actual production, the structure of the one-way pulley is similar to that of a ratchet, with its outer peripheral wall capable of rolling on the guide rail 300 and its rotating shaft fixedly connected to the mover 220. The provision of the one-way pulley can determine the direction of movement of the mover 220 on the rail, preventing the mover 220 from continuously moving in the first path or the second path when the blade 110 rotates.

[0029] In one embodiment, a web 240 is disposed within the blade 110 to support the blade 110. The web 240 can bear most of the bending moment and shear force of the blade 110, thereby increasing the bending resistance of the blade 110. One end of the blade 110 is fixed to the main shaft of the generator. The blade 110 has a blade root 111 close to the main shaft of the generator and a blade tip 112 away from the main shaft. When the web 240 is located within the blade 110, the web 240 has one end close to the blade root 111 and another end close to the blade tip 112. A guide rail 300 is disposed on the web 240 and extends along the length of the web 240. When the blade 110 rotates, the centrifugal force exerted on the mover 220 by the rotation of the blade 110 and the weight of the mover 220 drive the mover 220 to move along the guide rail 300.

[0030] In one embodiment, the guide rail 300 includes two straight segments and two connecting loops 230, which form a ring-shaped structure. The two straight segments are arranged in parallel and oriented in the same direction as the length of the blade 110. The stator 210 is mounted on one of the straight segments. The first sliding path of the mover 220 on the guide rail 300 is the mover 220 moving on the straight segment with the stator 210. The second sliding path of the mover 220 on the guide rail 300 is the mover 220 moving on the straight segment without the stator 210 and on the two connecting loops 230. When the mover 220 moves along the first path, it cuts the magnetic flux lines generated by the stator 210, thereby generating an induced electromotive force.

[0031] In one embodiment, when the blade 110 rotates, the straight section on which the stator 210 is installed is located in front of the rotation direction of the blade 110. Combined with the rotation direction of the blade 110 and the setting of the one-way pulley, it can be understood that when the mover 220 moves in a first path, that is, the mover 220 moves from one end close to the blade root 111 to one end close to the blade tip 112, as the blade 110 rotates, the mover 220 moves in a second path, that is, the mover 220 moves from one end close to the blade tip 112 to one end close to the blade root 111.

[0032] In one embodiment, the centrifugal force on the mover 220 is less than the weight of the mover 220 itself. When the mover 220 is near the tip 112, as the blade 110 rotates, the centrifugal force on the mover 220 is less than the weight of the mover 220 itself, ensuring that the mover 220 can move from the position near the tip 112 to the position near the root 111. When the blade 110 rotates, the mover 220 is inside the blade 110, and the mover 220 rotates synchronously with the blade 110 around the rotating shaft of the generator. The mover 220 has a centrifugal force when rotating around the rotating shaft of the generator. In this embodiment, the centrifugal force of the mover 220 is first calculated, where the formula used for the calculation is F=mω. 2 r, where F is the centrifugal force on the object, m is the mass of the mover 220, ω is the angular velocity, and r is the distance between the mover 220 and the generator shaft. Next, calculate the gravity of the mover 220 using the formula G=mg, where m is the mass of the mover 220 and g is the acceleration due to gravity. This tells us that we need to ensure ω 2 r < g. The formula determines the range of blade 110 radius and angular velocity, ensuring that the centrifugal force on mover 220 is less than gravity. For a small wind turbine, with a radius r of 10 meters, blade 110 rotational speed ω = 1 radian per second, or 10 revolutions per minute, sufficient for the operation of mover 220 in a typical linear generator.

[0033] In one embodiment, the centrifugal force of the mover 220 plus the weight of the mover 220 is greater than the resistance exerted on the mover 220 by the magnetic field generated by the stator 210. When the mover 220 moves along the first path on the guide rail 300, the mover 220 cuts the magnetic flux lines generated by the stator 210 as it passes through the stator 210. At this time, the magnetic flux lines generated by the stator 210 exert a certain resistance on the movement of the mover 220. The amount of induced electromotive force generated when the mover 220 cuts the magnetic flux lines can be calculated using the formula E=BLV. As can be seen from the formula, the greater the speed of the mover 220, the greater the current generated. In this embodiment, when the mover 220 moves along the first path on the guide rail 300, that is, the mover 220 moves from a position close to the blade root 111 to a position close to the blade tip 112, the centrifugal force of the mover 220 plus the gravity of the mover 220 itself is set to be greater than the resistance of the magnetic field generated by the stator 210 to the mover 220, thereby ensuring that the mover 220 can smoothly move from a position close to the blade root 111 to a position close to the blade tip 112.

[0034] In one embodiment, the mover 220 is not subject to the magnetic field resistance generated by the stator 210 when sliding on the guide rail 300 along the second path, ensuring that the mover 220 can move from a position close to the blade tip 112 to a position close to the blade root 111, further ensuring that the mover 220 can operate smoothly on the guide rail 300 along the second path.

[0035] It is understood that the movement trajectory of the blade 110 is a full circle. The blade 110 is in a vertical position when pointing at the twelve o'clock direction and the six o'clock direction, and is in a horizontal position when pointing at the three o'clock direction and the nine o'clock direction. Starting from the three o'clock direction, the blade 110 rotates clockwise. During the process of the blade 110 moving to the nine o'clock direction, the mover 220 is affected by the combined effects of centrifugal force and its own weight. The mover 220 has sufficient time to move from the blade root 111 to the blade tip 112 under the resistance of the magnetic field. When the blade 110 moves from pointing to the nine o'clock direction to pointing to the three o'clock direction, the mover 220 is subjected to centrifugal force and its own gravity, and the centrifugal force and its own gravity on the mover 220 can partially offset each other. Since the centrifugal force on the mover 220 is less than the gravity of the mover 220, and the mover 220 is not subject to the magnetic field resistance generated by the stator 210 when moving from a position close to the blade tip 112 to a position close to the blade root 111, the mover 220 has enough time to return to the blade root 111.

[0036] Further, such as Figures 1 to 2As shown, the blade 110 rotates clockwise. If the blade 110 points to the nine o'clock direction, the mover 220 is in the connection loop 230 near the blade tip 112. The stator 210 is subjected to a downward gravity force, which is consistent with the direction of movement of the mover 220, and the mover 220 passes smoothly through the connection loop 230. If the blade 110 points to the three o'clock direction, the mover 220 is in the connection loop 230 near the blade root 111. The stator 210 is subjected to a downward gravity force, which is consistent with the direction of movement of the mover 220, and the mover 220 passes smoothly through the connection loop 230.

[0037] In one embodiment, the position of the mover 220 on the guide rail 300 is adjustable. When the blade 110 is stationary, the mover 220 is located on the connecting loop 230 of the guide rail 300 close to the blade 110's rotation axis. When the blade 110 rotates, the mover 220 moves to the connecting loop 230 of the guide rail 300 away from the blade 110's rotation axis. In this embodiment, the mover 220, the stator 210, and the guide rail 300 form a linear generator that also functions as an electric motor. When the linear generator is energized, the mover 220 is movable on the guide rail 300. When the blade 110 is stationary, the mover 220 is located on the connecting loop 230 of the guide rail 300 close to the blade 110's rotation axis. At this time, the wind speed required for the blade 110 to rotate is relatively low. When the blade 110 begins to rotate, the mover 220 is controlled to move to the connecting loop 230 of the guide rail 300 away from the blade 110's rotation axis to increase the blade 110's rotational inertia. Inertia is the inertia of an object in a translational state. The greater the mass, the greater the inertia, and the more difficult it is to change its translational state. The moment of inertia is the inertia of an object in a rotational state. The moment of inertia I = mr 2 The larger the mass, the more difficult it is to change its rotational state. The mover 220 moves to the connecting loop 230 of the guide rail 300 away from the rotating shaft of the blade 110. The mover 220 acts as a counterweight to increase the mass of the blade 110, thereby increasing the rotational inertia of the blade 110, making the angular velocity of the blade 110 more difficult to change, further enhancing the stability of the blade 110's rotation under uncertain wind speeds. In a further configuration, after the blade 110 is running smoothly, when the blade 110 is pointing at the nine o'clock direction, the linear generator is de-energized. At this time, the mover 220 in the blade 110 can operate stably on the guide rail 300.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A novel wind turbine generator set with a built-in linear reciprocating generator in the wind turbine blade, characterized in that: include: Leaf blade, the leaf is hollow inside; A guide rail, the guide rail is fixedly arranged inside the blade, a stator is arranged on the guide rail, a mover is arranged on the guide rail and can slide along the guide rail, the mover has a first path and a second path when sliding on the guide rail, the stator is arranged on the first path, the mover passes the stator when moving on the guide rail along the first path, the end of the first path of the mover is the starting end of the second path, and the end of the second path of the mover is the starting end of the first path; The guide rail includes two straight segments and two connecting loops, which form a ring structure. The stator is installed on one of the straight segments. The first path of the mover sliding on the guide rail is that the mover moves on the straight segment provided with the stator. When the mover moves along the second path on the guide rail, the mover is mainly used to reset to ensure that the mover can circulate on the guide rail; A limit assembly is used to limit the mover from running in a preset manner on the guide rail when the blade rotates to drive the mover to slide on the guide rail. The limit assembly is a one-way pulley that can only rotate in one direction. The one-way pulley is arranged between the guide rail and the mover to prevent the mover from repeatedly running in the first path or the second path on the track; When the blades rotate, the straight section where the stator is installed is in front of the blade's rotation direction; the centrifugal force of the mover plus the mover's own gravity is greater than the resistance of the magnetic field generated by the stator on the mover; When the mover slides on the guide rail in the second path, it is not subject to the magnetic field resistance generated by the stator. The position of the mover on the guide rail can be adjusted. When the blade is stationary, the mover is in the connection loop of the guide rail close to the blade shaft. When the blade starts, the mover moves to the connection loop of the guide rail away from the blade shaft.

2. The novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade according to claim 1, characterized in that: A web is provided inside the blade, the web is used to support the blade, and the guide rail is provided on the web.

3. The novel wind turbine generator set with a built-in linear reciprocating generator in a wind turbine blade according to claim 1, characterized in that: The centrifugal force on the mover is smaller than the mover's own weight.

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