阅读说明：本技术 一种自动调整质心的翼臂伸缩式垂直轴风力机 (Wing arm telescopic vertical axis wind turbine capable of automatically adjusting mass center ) 是由 张晨 李超 薛雪 于 2021-10-13 设计创作，主要内容包括：本发明涉及一种自动调整质心的翼臂伸缩式垂直轴风力机,由叶片、叶片转轴、齿轮、叶片轴导轨及滑块、叶片轴轴承及轴承座、齿条、固定板、限位缓冲器、转动移动复合副1、平衡杠杆、杠杆轴承、平衡导轨及滑块、转动移动复合模块2、平衡质量块、风力机旋转架、风力机旋转轴组成。叶片达到一定的迎风角时,风力迫使叶片绕其转轴转动,使阻力型叶片凹面打开,凸面收起；叶片转轴经齿轮齿条带动其导轨上的滑块同步移动,使凹面叶片的翼臂自动伸展、凸面叶片的翼臂自动回缩；滑块同步驱动平衡杠杆把配重质量块向翼臂伸展的相反方向移动。在提高风力机驱动力和力臂,减小阻力和阻力臂的同时,完成风力机质心的偏移补偿,提高风力机运行的稳定性。(The invention relates to a wing arm telescopic vertical axis wind turbine capable of automatically adjusting the mass center, which consists of a blade, a blade rotating shaft, a gear, a blade shaft guide rail and a sliding block, a blade shaft bearing and a bearing seat, a rack, a fixing plate, a limiting buffer, a rotary and movable composite pair 1, a balance lever, a lever bearing, a balance guide rail and a sliding block, a rotary and movable composite module 2, a balance mass block, a wind turbine rotating frame and a wind turbine rotating shaft. When the blades reach a certain windward angle, the wind force forces the blades to rotate around the rotating shafts of the blades, so that the concave surfaces of the resistance type blades are opened, and the convex surfaces of the resistance type blades are retracted; the vane rotating shaft drives the sliding block on the guide rail to synchronously move through the gear rack, so that the wing arm of the concave vane automatically extends and the wing arm of the convex vane automatically retracts; the slide block synchronously drives the balance lever to move the balance weight mass block to the opposite direction of the extension of the wing arm. The driving force and the arm of force of the wind turbine are improved, the resistance and the resistance arm are reduced, meanwhile, the offset compensation of the mass center of the wind turbine is completed, and the running stability of the wind turbine is improved.)

1. A wing arm telescopic vertical axis wind turbine capable of automatically adjusting the mass center is composed of blades, a blade rotating shaft, a gear, a blade shaft guide rail, a blade shaft sliding block, a blade shaft bearing, a bearing seat, a rack, a fixing plate, a limiting buffer, a rotating and moving composite pair 1, a balance lever, a lever bearing, a balance sliding block and a guide rail thereof, a rotating and moving composite module 2, a balance mass block, a wind turbine rotating frame and a wind turbine rotating shaft; a rotating shaft is arranged on the side edge of the blade, and a bearing and a gear are arranged on the rotating shaft to form a blade assembly; a blade shaft guide rail and a sliding block are arranged on a rotating frame of the wind turbine along the radial direction of a rotating shaft of the wind turbine to form a blade shaft guide rail sliding block component; the rack is arranged on a rotating frame of the wind turbine through a fixed plate, and the rack and a gear arranged on a rotating shaft of the blade form a gear rack assembly; the bearing arranged on the blade rotating shaft is connected with the blade shaft sliding block through a bearing seat of the bearing to form a constraint relation that the blade rotating shaft can rotate relative to the sliding block and the sliding block can move relative to the rotating frame of the wind turbine; when the bearing seats on the two blade assemblies are connected with the blade shaft sliding blocks, the bearing seats on the two blade assemblies are required to be arranged diagonally on the sliding blocks, so that the gears on the two blade assemblies are only meshed with the racks on the same side, and the two blade assemblies are mutually linked with the blade shaft sliding blocks through the respective gear racks; the sliding block limiting buffer is used for limiting the opening and closing rotation angle of the blades and providing buffering; the balance lever is arranged on an upper bottom plate and a lower bottom plate of a wind turbine rotating frame through a lever bearing and a bearing seat thereof, the balance lever and the bottom plate form a revolute pair motion relation, the inner side end of the balance lever and a rotary moving composite pair 1 arranged on a blade shaft sliding block form a revolute pair motion relation, and the rotary moving composite pair 1 and the blade shaft sliding block form a revolute pair motion relation; and a balance sliding block and a guide rail thereof are arranged on the outer side of the mounting position of the lever bearing in parallel with the guide rail of the blade shaft, the balance lever forms a revolute pair with the balance sliding block through rotating the moving composite module 2, the balance sliding block forms a revolute pair with the outer side end of the balance lever, and a balance mass block is mounted at the outermost end of the balance lever.

2. The wind turbine with the telescopic wing arm and the telescopic vertical shaft capable of automatically adjusting the center of mass according to claim 1, wherein the blade shaft sliding block drives the two blade shafts to deviate from and approach the rotation center of the wind turbine, the inner end of the balance lever is synchronously shifted to move together with the blade shaft sliding block through a rotating and moving composite pair arranged on the blade shaft sliding block, so that the balance lever rotates around a bearing of the balance lever, and the outer end of the balance lever drives the balance sliding block to move on a guide rail of the balance lever in a direction opposite to the movement direction of the blade shaft sliding block through the rotating and moving composite pair arranged on the balance sliding block.

3. The wind turbine with telescopic wing arm and vertical shaft capable of automatically adjusting the center of mass according to claim 1, wherein a dedicated mass block is arranged at the outer end of the balance lever, and the mass block moves in an arc shape along with the outer side of the balance lever; the center distance between the mass block and a bearing of the balance lever can be adjusted through the screwing-in depth of the threads between the mass block and the lever, the size of the balance weight can be changed through increasing or decreasing the mass, and the mass center position of the wind turbine can be adjusted conveniently.

4. The wind turbine with telescopic wing arm and automatic center of mass adjustment according to claim 1, wherein the axes of the two balance lever bearings are installed on a vertical line passing through the axis of rotation of the wind turbine and the axis of the guide rail of the blade shaft, and when the center of the slider of the blade shaft coincides with the center of rotation of the wind turbine (the center of mass of the wind turbine coincides with the center of rotation thereof), the axes of the two balance levers and the connecting line of the lever bearings and the axis of rotation of the wind turbine have a certain included angle, so that the moving direction of the center of mass when the balance mass block swings in an arc shape effectively balances the change of the center of mass caused by the rotation of the blade around the rotating shaft thereof.

Technical Field

The invention relates to the field of vertical axis wind turbines, in particular to a vertical axis resistance type wind turbine with a telescopic wing arm and an automatic mass center adjusting function.

Background

The wind turbines can be divided into two types, namely a horizontal axis wind turbine and a vertical axis wind turbine according to the arrangement direction of a rotating shaft of the wind turbines, and the vertical axis wind turbine can be divided into a lifting force type and a resistance type according to the working principle of blades of the wind turbines. The lift force type blade generates lift force under the action of wind power to form the rotating torque of the wind turbine, and is characterized by high wind energy utilization rate, high requirement on starting wind speed and suitability for areas with rich wind energy resources; the resistance type blade depends on the resistance of the blade to wind, the reacting force pushes the wind machine to rotate, and the resistance type blade is characterized in that the wind energy utilization rate is lower than that of the lift type blade, but the starting wind speed is low, the generated torque is large, and the resistance type blade is suitable for being used in areas with insufficient wind energy resources.

The two surfaces of a general resistance type wind turbine blade respectively present convex and concave shapes, and the resistance type wind turbine blade works by utilizing the principle that different wind resistances are generated when wind blows to the blades with the convex surfaces and the concave surfaces. When a traditional vertical axis resistance type wind turbine operates, a concave windward blade (hereinafter referred to as a windward blade) generates larger wind resistance than a convex windward blade (hereinafter referred to as a leeward blade), so that the resultant moment of a positive thrust moment generated by the windward blade and a negative resistance moment generated by the leeward blade is an effective moment for pushing the wind turbine to rotate to do work.

In order to improve the effective moment of the wind turbine, the invention patent (patent number: ZL201710371018.6) discloses a vertical shaft resistance type wind turbine with a wing arm capable of automatically telescoping. The wind turbine can expand and contract corresponding blades according to the change of the windward angle of the blades during operation, and can automatically increase windward side wing arms and reduce leeward side wing arms at the same time, thereby improving the effective rotating moment generated by wind power. The invention further designs a special structural device on the basis, which can alleviate the mass center deviation problem of the wind turbine in the operation process and improve the stability of the wind turbine in operation.

Disclosure of Invention

The technical problem is as follows: the invention designs a wing arm automatic telescopic vertical shaft resistance type wind turbine with an automatic center-of-mass adjusting device, which automatically increases a driving force arm at the side of a wind blade and reduces a resistance force arm at the side of a back wind blade so as to improve the effective output torque of the wind turbine, synchronously and automatically adjust the offset of the center of mass of the wind turbine and the rotation center of the wind turbine and improve the dynamic balance performance of the wind turbine during operation.

The working process of the wind turbine is as follows: when wind blows to the blades, the windward blades (concave surfaces) rotate around the blade rotating shafts to be opened under the action of wind force, so that the windward area is increased; the windward blade rotating shaft moves along the rotating shaft guide rail in the radial direction far away from the rotating shaft of the wind turbine while rotating, until the blades are completely opened, and the stop block limits the further rotation of the blade rotating shaft;

meanwhile, the leeward blades (convex surfaces) rotate and contract under the action of wind force; the rotation of the rotating shaft of the leeward blade moves along the guide rail of the rotating shaft to the radial direction close to the rotating shaft of the wind machine until the contraction action of the blade is limited by the stop block.

The radial movement of the rotating shafts of the two blades are matched with each other, so that the driving force arm at the windward blade side is extended, and the blocking force arm at the back blade side is reduced, so that the wind turbine can obtain larger output torque under the condition of the same wind power.

The windward blades are opened in a rotating mode, and the rotating shafts of the blades are synchronously far away from the rotating center line of the wind turbine; the action that the leeward blades are rotated and closed and the blade rotating shafts are close to the rotating center line of the wind turbine causes the mass center of the wind turbine to deviate from the rotating center of the wind turbine, so that the problem of dynamic unbalance is brought to the operation of the wind turbine, the increase of the rated working rotating speed of the wind turbine is restricted, and the wind energy conversion efficiency of the wind turbine is influenced.

The technical scheme is as follows: the invention relates to a wing arm telescopic vertical shaft resistance type wind turbine capable of automatically adjusting the mass center, which consists of a blade, a blade rotating shaft, a gear, a rack, a blade guide rail, a blade sliding block, a blade rotating shaft bearing, a bearing seat, a rotating and moving composite module 1, a sliding block limiting buffer, a rack fixing plate, a balance lever, a lever bearing, a balance sliding block and a guide rail thereof, a rotating and moving composite module 2, a balance mass block, a wind turbine rotating frame and a wind turbine rotating shaft.

The wind turbine blade assembly is characterized in that a wind turbine blade is fixedly connected with a blade rotating shaft, and a gear and a bearing are respectively fixed near two ends of the blade rotating shaft to form a blade assembly;

two blade shaft guide rails are correspondingly arranged on the inner sides of an upper bottom plate and a lower bottom plate of a wind turbine rotating frame in parallel, the guide rails are arranged along the radial direction of a rotating shaft of the wind turbine, and slide blocks are arranged on the guide rails to form a blade guide rail slide block assembly;

two blade assemblies are arranged on the blade guide rail sliding block assembly, the blade assemblies are symmetrically arranged relative to the center of the sliding block, and the end part of each blade rotating shaft is connected with the sliding block through a blade rotating shaft bearing and a bearing seat thereof, so that the rotating shaft can rotate while sliding on the guide rail along with the blade sliding block;

the rack is arranged on a rotating frame of the wind turbine through a fixing plate, so that the position of the gear on the sliding block of each blade assembly is ensured to be meshed with the rack arranged on one side of the guide rail and not to generate motion interference with the rack arranged on the other side;

therefore, when the two blades rotate around the rotating shafts in opposite directions under the action of wind force, the gears on the two rotating shafts roll on the respective racks in a meshed mode to drive the bearing block and the blade shaft sliding block to move in the same direction along the guide rail, and therefore the distance between the two blade rotating shafts and the rotating shaft center of the wind turbine is changed in a stretching mode and a contracting mode.

Two balancing devices consisting of a balancing lever, a balancing guide rail, a sliding block and a balancing mass block are correspondingly arranged on the upper bottom plate and the lower bottom plate of the wind turbine rotating frame on the outer sides of the two racks. The middle part of the balance lever is provided with a bearing, and the end surface of a bearing seat of the balance lever is arranged on the bottom plate, so that the balance lever can swing in the parallel plane of the bottom plate.

The outer side of each balance lever bearing is respectively provided with a balance guide rail parallel to the blade guide rail and a slide block thereof, and the slide block is provided with a rotary moving pair composite module 2, so that the composite module 2 and the slide block form a rotary pair and form a moving pair composite motion relation with the outer end of the balance lever.

The blade sliding block is also provided with a rotary and movable composite module 1, the module and the sliding block form a rotary pair, and a movable pair motion relation is formed between the module and the inner side end of the balance lever.

When the rotation of the two blades and the meshing rolling of the gear at the rotating shaft end on the rack thereof drive the blade sliding block to move towards the rolling direction of the gear along the guide rail thereof, so that the center of mass of the wind turbine deviates from the rotating center thereof, and the problem of unbalanced rotation of the wind turbine is formed, the blade sliding block synchronously drives the rotating and moving composite module 1 thereon, the inner side end of the balance lever is stirred to rotate around the bearing thereof in the same direction, and the outer side end of the balance lever drives the sliding block on the balance guide rail to move towards the opposite direction; the balance mass block also rotates around the balance lever bearing in the opposite direction, so that the problem of dynamic unbalance caused by deviation of a mass center of the wind turbine from a rotation center due to deviation of a blade sliding block and rotation of the blade is compensated.

The mechanisms are arranged between a pair of top plates and bottom plates which are arranged up and down and fixed by a support upright post to form a basic unit of the wind turbine.

A practical wind turbine can be formed by axially stacking a plurality of basic units. When in superposition, the unification of the rotating shafts of the wind turbines is ensured, the blade guide rails of all the basic units are mutually and uniformly staggered by an angle, and the mutual interference of the blades during rotation is avoided.

The working process of the wind turbine with the automatically telescopic wing arm comprises the following steps: when wind blows to the wind turbine, the windward blades rotate around the rotating shafts of the windward blades to be opened under the action of the wind;

meanwhile, the blade rotating shaft drives the gear to rotate and is meshed with the fixed rack, so that the blade rotating shaft rotates, and meanwhile, the bearing seat drives the sliding block to move for a distance along the guide rail of the sliding block in the direction away from the rotating axis of the wind turbine, the wing arm of the windward blade automatically extends, and the sliding block limiting buffer limits the continuous rotation of the blade shaft until the wind resistance of the blade is maximum after the blade is opened;

the leeward blade surface rotates around the rotating shaft to be folded under the action of wind power, the sliding block is driven to move for a certain distance in the direction close to the rotating shaft center of the wind turbine, and the wing arm of the leeward blade is automatically shortened until the wing arm is limited by the sliding block limiting buffer.

Furthermore, in the blade assembly, the blade is a thin-wall surface with a concave surface and a convex surface, namely the shape of the blade of the general resistance type wind turbine, and is fixedly connected with the rotating shaft of the blade at one side, so that the blade can form a torque around the rotating shaft of the blade under the action of wind force.

Furthermore, in the blade assembly, the parameters of the two gears are consistent, the two gears are fixedly connected with the blade rotating shaft, and shaft ends for mounting bearings are reserved at the two ends of the blade rotating shaft.

Furthermore, the blade assemblies are used in pairs in a wind turbine basic unit and are symmetrically arranged according to the centers of the blade guide rail sliding blocks, and even if the concave surface of one side of the blade faces the wind, the convex surface of the blade corresponding to the other side of the blade faces the wind.

Furthermore, the wind turbine rotating frame is a wind turbine basic frame consisting of an upper bottom plate, a lower bottom plate and supporting pieces on two sides, and is a mounting frame of parts in wind turbine basic units, the basic units can be connected through the upper bottom plate and the lower bottom plate to form a main body of the wind turbine in a superposed mode, and finally mechanical energy is output through a unified wind turbine rotating shaft.

Furthermore, the rack fixing plates are arranged on two sides of the guide rail and are parallel to the guide rail, and each rack is borne on the fixing plate and is used for being meshed with the gear on the blade rotating shaft on the same side, and when the gear is meshed and rolls on the rack, the sliding blocks on the guide rail can be driven to move in the same direction through the blade rotating shaft and the bearing seat.

Furthermore, the rotating shaft of the wind turbine is a rotating center of the wind turbine for outputting mechanical energy, and is an axis center of the wind turbine for outputting outside after the wind turbine is composed of a plurality of basic units of the wind turbine, and the positions of the rotating shafts of the wind turbine exist on the upper bottom plate and the lower bottom plate of the rotating frame of the wind turbine of each basic unit, but the rotating shafts of the wind turbine are not necessarily embodied by physical shafts.

Furthermore, the guide rail sliding block assembly is fixedly arranged on an upper bottom plate and a lower bottom plate of a wind turbine rotating frame along the radial direction of a wind turbine rotating shaft, the upper guide rail and the lower guide rail are parallel and symmetrical in a face-to-face mode, and bearing seats arranged on the guide rail sliding blocks are respectively used for connecting upper shaft ends and lower shaft ends of two groups of blade rotating shafts. For the installation of bearing frame is convenient, can arrange two sliders on each guide rail, independent separately, also can install two bearing frames on a slider, make the removal of two blade axles form the linkage.

Furthermore, the sliding block is connected with a bearing seat, wherein a rotating shaft of the bearing is vertical to the blade guide rail, and each blade assembly is arranged in the bearing through the rotating shaft of the blade assembly. Therefore, when the gear is in rotary engagement with the rack, the sliding block can be driven to slide on the guide rail.

Furthermore, the rotation angle of the blades around the rotating shaft is limited and buffered by the (adjustable) limit of the sliding block limit buffer, and when one group of the corresponding blades is completely opened, the other group of the corresponding blades is completely folded, and vice versa.

Furthermore, the wind turbine blade automatically adjusts the posture along with the change of the wind angle of the wind turbine blade in the rotating process of the wind turbine, when the concave windward blade rotates to the convex windward area along with the wind turbine, the convex windward blade symmetrical to the axis of the concave windward blade is converted into the concave windward blade, and the concave windward blade and the convex windward blade are mutually converted in the rotating process, so that the automatic extension and retraction of the wing arm are completed, and the effective output torque of the wind turbine is improved.

Furthermore, a rotating and moving pair composite module is also arranged on the blade sliding block, wherein the axis of the rotating pair is vertical to the table surface of the sliding block and forms a rotatable coupling relation with the sliding block; the movable direction of the sliding pair is parallel to the table surface of the sliding block and is matched with the inner side end of the balance lever to form a relatively sliding connection relation.

Furthermore, the middle part of the balance lever is connected with the inner sides of the upper bottom plate and the lower bottom plate of the wind turbine basic unit through a bearing, the axis of the bearing is vertically arranged with the respective bottom plates, so that the balance lever forms a revolute pair motion relation with the bottom plates through the bearing, and simultaneously, the inner end of the balance lever is inserted into the revolute pair composite module on the blade sliding block to form a revolute pair;

furthermore, a balance guide rail parallel to the blade guide rail and a slide block matched with the balance guide rail are respectively arranged at the outer side of the balance lever bearing, a rotary moving pair composite module with the same function as the above is arranged on the slide block, and the outer side end of the balance lever is inserted into the composite module to form a moving pair.

Furthermore, a balance mass block is installed at the outer end of the balance lever and used for balancing the mass center of the wind turbine.

Further, when the blade sliding block is driven by the blade rotating shaft gear and moves on the guide rail of the blade sliding block, the balancing lever is driven to rotate around the rotating center of the blade sliding block by the rotating moving pair composite module on the blade sliding block, and the balancing sliding block and the balancing mass block are driven to move in the direction opposite to the sliding direction of the blade sliding block, so that the mass center of the wind turbine is adjusted to be close to the rotating axis of the wind turbine.

Has the advantages that: the invention has the beneficial effects that:

1. the vertical axis resistance type wind turbine with the telescopic wing arm and the automatic mass center adjustment function is designed, so that when wind blows to the blades, the blades on the windward side of the wind turbine automatically stretch the force arm at the same time of stretching, and the forward driving moment is effectively enhanced; the blades on the leeward side are folded, the force arm is automatically shortened, the negative resistance moment of the blades on the leeward side is reduced, and the effective output moment of the wind turbine is improved; a set of center of mass adjusting device is designed, so that the change of the center of mass position of the wind turbine caused by the rotation and the movement of the blades of the wind turbine is automatically compensated while the wing arms are adjusted, the dynamic unbalance amount of the wind turbine during operation is reduced, and the effect of improving the operation stability of the wind turbine is achieved.

2. The practical wind turbine can be formed by modularly overlapping basic units and can be combined according to actual requirements.

Drawings

FIG. 1 is a schematic external view of a vertical axis wind turbine with a telescopic wing arm and an automatic center of mass adjustment, which is composed of two basic units;

FIG. 2 is a schematic diagram of a basic unit structure principle of a vertical axis wind turbine with a telescopic wing arm and an automatic center of mass adjustment.

FIG. 3 is a schematic diagram of automatically adjusting a center of mass of a wind turbine as a wind turbine wing arm is extended and retracted.

Fig. 4 is a schematic view of the structural principle of the rotary moving composite pairs 1 and 2 and the sliding table and the balance lever connected with the rotary moving composite pairs.

In the figure: 1-blade, 2-blade rotating shaft, 3-wind turbine rotating frame, 4-wind turbine rotating shaft, 5-rack, 6-gear, 7-blade shaft guide rail, 8-fixing plate, 9-blade shaft bearing and bearing seat, 10-blade shaft sliding block, 11-balance mass block, 12-balance sliding block and guide rail thereof, 13-lever bearing, 14-rotation movement composite module 2, 15-balance lever, 16-rotation movement composite pair 1, 17-limiting buffer.

Detailed Description

The embodiment of the invention provides a resistance type wind turbine with a telescopic wing arm and an automatic mass center adjusting function.

The above actions drive the blade shaft sliding block to directionally slide on the guide rail of the blade shaft sliding block through the gear rack, so that the concave blade wing arm automatically extends and the convex blade wing arm automatically retracts; meanwhile, the blade shaft sliding block drives one end of the inner side of the balance lever to move along with the blade shaft sliding block through the rotating and moving composite pair on the blade shaft sliding block, so that the balance lever is stirred to rotate around the lever bearing, one end of the outer side of the lever drives the guide sliding block to move along the guide rail of the guide sliding block in the opposite direction of the movement of the blade shaft through the other set of rotating and moving composite pair, and meanwhile, the balance mass block moves along an arc line by taking the lever bearing as the center so as to solve the problem that the center of mass of a wind turbine deviates from a central rotating shaft due to the rotation and the movement of the blades. When the mechanism operates, the effective output torque of the wind turbine is improved, the mass center offset of the wind turbine during rotation is reduced, and the operation of the wind turbine is stabilized.

The technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by a person of ordinary skill without creative efforts belong to the protection scope of the present invention.

With reference to fig. 1-4, the resistance type wind turbine with the telescopic wing arm and the automatic mass center adjustment function comprises a 1-blade, a 2-blade rotating shaft, a 3-wind turbine rotating frame, a 4-wind turbine rotating shaft, a 5-rack, a 6-gear, a 7-blade shaft guide rail, an 8-fixing plate, a 9-blade shaft bearing and bearing seat, a 10-blade shaft sliding block, an 11-balance mass block, a 12-balance sliding block and a guide rail thereof, a 13-lever bearing, a 14-rotation and movement composite module 2, a 15-balance lever, a 16-rotation and movement composite pair 1, a 17-limiting buffer and the like.

The wind turbine rotating frame 3 is a (cylindrical) structural member composed of an upper bottom plate, a lower bottom plate (circular bottom plate) and a supporting member as shown in fig. 2. The upper bottom plate, the lower bottom plate and the supporting piece are fixed frames which are used as a rack for mounting the parts on one hand and are used for transmitting the rotating power of the wind turbine on the other hand. The rotating frame 3 and functional parts on the rotating frame form a basic unit of the wind turbine.

Wherein, the blade 1, the blade rotating shaft 2 and the gear 6 are connected into two blade assemblies in a fixed connection mode according to the illustration in fig. 2. During connection, parameters (tooth number and modulus) of each gear are required to be consistent, relative motion with the blade rotating shaft cannot be realized, and shaft ends matched with bearings in the bearing block 9 are reserved at two ends of the blade rotating shaft.

As shown in fig. 2 and 4, two blade shaft guide rails 7 are symmetrically installed at the inner sides of the upper and lower (circular) bottom plates of the wind turbine rotating frame 3 in a face-to-face manner, the upper and lower guide rails are parallel and arranged along the radial direction of the wind turbine rotating shaft, and the guide rails are matched with blade shaft sliding blocks 10.

The two blade assemblies are symmetrically arranged relative to the center of the blade shaft guide rail sliding block according to the figure 2 and the figure 3, and are arranged at the front end and the rear end of the base of the sliding block 10 through blade shaft bearings and bearing seats 9 at the two ends of each blade rotating shaft.

Two blade assembly bearing seats 9 are installed on the sliding block 10 in a staggered mode, as shown in fig. 4, the staggered distance is to ensure that the tooth tops of the gears meshed with the racks on one side do not interfere with the movement of the racks on the opposite side, and the inner ring of the bearing in each bearing seat is axially fixed with the rotating shafts of the two blades, namely, the bearing can only rotate along with the rotating shafts of the blades, and the rotating shafts of the blades cannot axially move.

As shown in fig. 2, 3 and 4, two racks 5 capable of meshing with the gear 6 on the rotating shaft of the blade are mounted on two sides of the guide rail 7 on the wind turbine rotating frame 3 by fixing plates 8 and are parallel to the guide rail.

It is emphasized that the upper and lower pair of gears mounted on each blade rotating shaft can only contact and mesh with the corresponding upper and lower racks on the same side of the guide rail, and when the concave surface of the blade rotates and expands against the wind, the rolling direction of the gears on the racks enables the blade rotating shaft to be far away from the center of the rotating shaft of the wind turbine; similarly, when the convex surface of the blade is folded against the wind, the rolling direction of the gear of the rotating shaft of the blade meshed with the rack on one side of the gear makes the rotating shaft of the blade close to the center of the rotating shaft of the wind turbine. Therefore, on the sliding block base, the bearing seats of the two blade rotating shafts are installed in a staggered mode at a certain distance, and the gears on the shafts are prevented from moving and interfering with the opposite racks.

A limiting buffer 17 is arranged on the guide rail and used for limiting the stroke and the motion buffer of the sliding block. The position of the limit buffer can be adjusted along the guide rail 7.

As shown in fig. 2, 3 and 4, the two blades 1 form a linkage mechanism by the rotating shaft 2, the gear 6, the rack 5, the blade shaft bearing and bearing block 9 and the blade shaft slider 10.

As shown in fig. 3 and 4, two rotation and movement composite pairs 16 are further mounted on the blade shaft slider 10, wherein each rotation pair is composed of a bearing and a bearing seat mounted on the platform of the slider 10 and a composite copy body member, one end of the composite pair body is cylindrical and is mounted in the inner ring of the bearing, so that the composite copy body member can freely rotate on the platform plane of the blade shaft slider 10.

As shown in fig. 3 and 4, a circular or square hole is formed in the upper half of the main body of the composite pair 16 not engaged with the bearing, and one end of the balance lever 15 is inserted into the hole, so that the composite pair main body and the balance lever form a moving pair, and the composite pair main body and the vane shaft slider 10 form a rotating pair.

As shown in fig. 3 and 4, the lever bearing 13 at the middle of the balance lever 15 is installed on the bottom plate of the wind turbine rotating frame 3 through its bearing seat, so that the balance lever and the bottom plate form a horizontal rotating pair.

Fig. 2 and 3 show that a set of balance lever mechanism is respectively configured for two blade assemblies on the same (upper or lower) bottom plate of a wind turbine rotating frame.

As shown in fig. 3 and 4, the two balance lever bearings 13 are mounted on a perpendicular line passing through the rotation axis of the wind turbine and perpendicular to the axis of the blade shaft guide rail, and two rotation and movement composite pairs 16 connected to the two balance lever bearings are arranged on the blade shaft slider 10 in the front-rear direction of the guide rail.

Therefore, as shown in fig. 3 and 4, when the inner ends of the two balance levers 15 are connected to the two composite rotating and moving pairs 16, the axes of the two balance levers and the connecting line between the bearing axis of the lever and the rotating axis of the wind turbine form a certain included angle, and the correct orientation of the included angle is determined as follows.

The correct direction of the included angle when the inner side ends of the two balance levers are connected with the two rotating and moving composite pairs is as follows: the direction of the axis of each balance lever is consistent with the direction of the connecting line from the rotating shaft of the blade to the front edge part of the blade (the error correction method is that the connection sequence of the balance lever and the two rotating and moving compound pairs 16 is exchanged).

After the balance lever 15 obtains the correct initial position included angle, starting from the coincidence of the center of the blade shaft sliding block and the rotation center of the wind turbine (at this time, the coincidence of the center of mass of the wind turbine and the rotation center of the wind turbine is realized on the geometric relationship of each purchased part of the wind turbine), when the center of mass of the blade changes along the arc direction around the rotation shaft as the blade rotates around the rotation shaft, the arc swing in the opposite direction of the outer end of the balance lever enables the movement direction of the mass block to effectively balance the change of the center of mass caused by the rotation of the blade around the rotation shaft (shown in fig. 3).

As shown in fig. 2, 3 and 4, the balancing slider and its guide rail 12 are mounted on the outer bottom plate of the lever bearing 13 in parallel with the blade shaft guide rail. The balance slide block is provided with a rotary movement compound pair 14 which has the same structure and function as the rotary movement compound pair 16, and the rotary movement compound pair and the outer end part of the balance lever 15 form a mutual sliding movement relation.

The distance between the mass block 11 arranged at the outer end of the balance lever 15 and the center of the balance rod bearing can be adjusted through the screwing depth of the screw thread between the mass block and the lever 15; the size of the balance weight is changed by increasing or decreasing the mass, so that the mass center position of the wind turbine can be conveniently adjusted.

In the wind field, as shown in fig. 2 and 3, two blades are simultaneously subjected to the thrust of wind, the concave blade generates clockwise torque on the rotating shaft of the concave blade, and the convex blade generates anticlockwise torque on the rotating shaft of the convex blade. When the acting force of wind is large enough, the concave blades rotate and open, the rotating shaft drives the gear to rotate clockwise, the gear and the rack on the same side move in a meshed mode, and the sliding block 10 is driven to move in the direction away from the rotating axis of the wind turbine; meanwhile, the convex blades are rotated and furled under the action of wind, the rotating shaft drives the gear to rotate anticlockwise, the gear and the rack on the same side are meshed to move, the sliding block 10 is driven to move towards the direction close to the rotating axis of the wind turbine, the two blades are unfolded and furled, and the upper sliding block 10 and the lower sliding block 10 move to form synchronous linkage until the sliding blocks touch the limiting buffer 17. At the moment, the concave blade is completely opened, and wind forms the maximum acting force and the maximum force arm on the blade; the convex blades are folded in a rotating mode, the windward area of the blades is reduced, and wind forms small acting force and a minimum force arm on the blades, so that the blades form maximum output force on a wind turbine.

The center of mass of the wind turbine deviates in the processes of rotating, opening and closing the convex and concave blades and driving the blades to move by the sliding blocks 10; at the same time, the slide block 10 also drives the rotary movement compound pair 16 to stir the balance lever 15 to rotate around the lever bearing 13, and reversely push the balance slide block 12 to move and reversely swing the balance mass block 11.

When the blades change the windward angle along with the rotation of the wind turbine, the output of the blades is reduced, the rotation angles of the two blades can be automatically adjusted along with the change of the windward angle and the field wind direction and the wind force until the windward positions of the two blades are interchanged and the next cycle begins.

Fig. 3 is a schematic diagram of the extension and contraction of the wing arm of the wind turbine and the automatic adjustment of the center of mass of the wind turbine, which shows the changes of the relative positions of the two blade rotating shafts and the center of the rotating frame of the wind turbine and the adjustment of the center of mass of the wind turbine after the concave windward blade of the blade is unfolded and the convex windward blade of the blade is folded.

Fig. 1 shows a wing arm automatic telescopic vertical shaft resistance type wind turbine composed of two basic units, and blades of the basic units are staggered by 90 degrees. As can be seen from FIG. 1, when the blade of one unit rotates to the lowest point of output, the blade of the other unit is just at the maximum point of output, so that the wind turbine can continuously output mechanical energy.

While the wind turbine with the automatically retractable vertical axis resistance of the wing arm for automatically adjusting the center of mass according to the present invention has been described in detail, it will be apparent to those skilled in the art that the concepts according to the embodiments of the present invention may be modified in the specific implementation manners and the application ranges.