CN111577536A

CN111577536A - Inner-pushing type vertical axis wind driven generator with adjustable radius and control method

Info

Publication number: CN111577536A
Application number: CN202010395162.5A
Authority: CN
Inventors: 冬之阳; 官伟; 徐勤为; 郝颖
Original assignee: Beijing Power Kingkong Technology Co ltd
Current assignee: Beijing Power Kingkong Technology Co ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2020-08-25

Abstract

The invention provides an inner-pushing type vertical axis wind driven generator with an adjustable radius and a control method, the device mainly comprises a stand column assembly, a blade assembly and a generator assembly, wherein the stand column assembly can jack up a movable disc at the top end of the generator assembly, the blade assembly can be lifted along with a lifting stand column, and the blade assembly is extended and retracted; the blade assembly is unfolded along with the descending of the lifting upright post; when the lifting column is lowered to the lower limit point, the blade assembly "collapses". Compared with the prior art, the blade can be unfolded to the maximum radius to start by breeze, and is suitable for the maximum power control of all wind speed ranges from breeze to rated wind speed. The operations of ' extending and retracting ', contracting and folding ' and the like can be carried out according to actual conditions. More importantly, the folding device is not provided with a special sliding hub and a special radius adjusting supporting rod, all the blade supporting rods can bear the stress of the blades, and the strength, reliability, safety and service life of the folding device are effectively improved.

Description

Inner-pushing type vertical axis wind driven generator with adjustable radius and control method

Technical Field

The invention relates to a wind power generation and control system, in particular to a foldable structure of a vertical axis wind power generator and a swept area control and storage control method.

Background

In recent years, wind power generation has been widely used, but the wind power generator is not suitable for mobile use because of its large size. Remote applications such as farming and pasturing areas, frontier sentry cards, geological prospecting, archaeology, etc. not only require a large supply of electricity, but often also movement. Wind power generation systems that are easily portable and portable have received attention for a number of applications.

Chinese patent CN103423088A discloses a vehicle-mounted folding wind-driven generator which can be conveniently disassembled and assembled, but the invention is novel in that the retractable support rod is fixed by a positioning screw, and although the structure is simple, the wind-driven generator is required to be manually folded by a user, which is time-consuming and labor-consuming, and the wind-driven generator can only be lifted and lowered, and the blades cannot be folded, so that the wind-driven generator is very inconvenient to carry.

Chinese patent CN204559466U discloses a field portable power generation device, this aerogenerator's support and fan blade adopt auto-lock hinge connection, can be at the during operation with the steady state who keeps the blade when placing, but this utility model can not automatic control aerogenerator blade folding and expand, need the manual expansion of user, because the fan tower pole is than higher, consequently is difficult to manually operation. But also fails to operate if the fan is rotating.

Chinese patent CN110242506A discloses a folding vertical axis wind turbine, which uses a motor to control the axial movement of a sliding sleeve of a blade support arm, thereby realizing the folding of a fan blade, but the invention needs axial sliding and circumferential rotation, has high requirements on the finish of an upright post, and in addition, the gap between the sliding sleeve and the upright post can cause vibration. The acting force arms of the support arm and the pull rod on the second connecting rod are small, so that large pushing force is needed; the longer sliding range of the actuator is required if the moment arm is to be increased, increasing the cost of the inventive mechanism. In addition, the mechanism of the invention is too complex, can not run for a long time when exposed to the environment with large sand wind, and has influenced reliability and service life.

Chinese patent CN104481810B discloses a self-extending vertical axis wind turbine, which has a complex structure, large moment of inertia, difficult start in breeze, and unfavorable to power generation in breeze, because the wind turbine and all mechanisms rotate above the motor; the adjustment of the invention is completed by a pure mechanical structure, and the required control requirements cannot be completed, for example, if the machine cannot be stopped in no-load state, the machine is controlled by only a flyweight, and the rotating speed and the power cannot be flexibly adjusted according to specific requirements; in addition, the device does not fulfill the portable and foldable requirement.

Chinese patent CN109630350A discloses a foldable phi-shaped vertical axis wind turbine, which after being folded, becomes wider in transverse dimension, occupies more transverse space, and is therefore not suitable for portability.

In summary, all the foldable vertical axis wind turbines in the prior art cannot meet the requirements of folding portability and power generation control for automatically and continuously adjusting the swept area, and have more movable components, and cannot meet the requirements in the aspects of reliability, safety, economy and the like. In addition, the existing vertical axis fan is difficult to install a mechanical brake system, so that the fan is difficult to realize rapid parking when exceeding safe wind speed or the fan fails, a large amount of heat is generated by electromagnetic braking and consumed in a generator and a controller, and the service life of the fan and the controller is influenced.

Disclosure of Invention

The invention provides an inner pushing type radius-adjustable vertical axis wind driven generator and a control method aiming at the defects of the prior art, compared with the prior art, the blade can be unfolded to the maximum radius to start breeze, and the swept radius and the area of the blade can also be adjusted through automatic control, so that the rotating speed of a fan and the power of absorbing wind energy are adjusted, and the inner pushing type radius-adjustable vertical axis wind driven generator is suitable for the maximum power control of all wind speed ranges from breeze to rated wind speed. When the wind speed exceeds the safe wind speed or the wind turbine is normally stopped, the wind energy can not be absorbed any more by extending and retracting; when meeting the fan trouble, through fold condition, combine electromagnetic brake can realize the braking fast. When needs were carried, through "shrink folding", made the stand to fall minimum state, the blade subassembly is folded around the stand to realize portable function. More importantly, the folding device is not provided with a special sliding hub and a special radius adjusting supporting rod, all the blade supporting rods can bear the stress of the blades, and the strength, reliability, safety and service life of the folding device are effectively improved.

The technical scheme adopted by the invention is as follows:

in order to achieve the purpose, the inner-pushing type vertical axis wind driven generator with the adjustable radius comprises a stand column assembly, a blade assembly and a generator assembly; the mounting flange at the top end of the upright post assembly is connected with the stator flange at the lower end of the generator assembly; the upper support rod, the parallel support rod and the lower support rod of the blade assembly are respectively connected with an upper support rod disc and a parallel support rod disc of the generator assembly and a lower support rod disc arranged on the upright post assembly; as the lifting upright is raised, the blade assembly is 'extended and retracted'; the blade assembly is unfolded along with the descending of the lifting upright post; when the lifting column is lowered to the lower limit point, the blade assembly "collapses".

The upright post assembly comprises a fixed upright post, a telescopic mechanism, a lower rotary table, a bushing, a lifting upright post and a mounting flange; the mounting flange is arranged at the top end of the lifting upright post, the lower turntable is fixed on the upright post and the height of the lower turntable can be adjusted, and the telescopic mechanism is fixed in the upright post; the telescopic rod in the telescopic mechanism is connected with the bottom end of the lifting upright post and can jack and retract the lifting upright post; the bush is installed between fixed stand top and the lift stand.

The blade assembly comprises a blade, an upper support, a parallel support, a lower support, an upper support rod, a parallel support rod, a lower support rod and a buffer; the blade assembly is arranged on the column assembly and the generator assembly, so that the blades are parallel to the fixed upright posts and form a parallel four-bar linkage structure together with the upper supporting rod and the parallel supporting rods; the upper support and the parallel support are arranged on the blade, and the lower support is connected with the upper support rod, the parallel support rod and the lower support rod respectively and can rotate freely; one end of the buffer is connected with the parallel support, and the other end of the buffer is connected with the free end of the upper support rod, so that inward and upward pulling force is generated on the blade.

The generator assembly comprises a stator flange, a stator shaft, a generator bearing, an outer rotor, a parallel strut disc and an upper strut disc; the generator adopts an outer rotor structure, the lower end of a stator shaft is provided with a stator flange, an upper support rod disc is arranged at the top end of the outer rotor, a parallel support rod disc is arranged at the lower end of the outer rotor, and the outer rotor is matched with the stator shaft through a generator bearing; the angle direction of the parallel strut disc is consistent with that of the upper strut disc.

The lower turntable comprises a fixed sleeve, a turntable bearing, a rotating sleeve and a lower support rod disc; the fixed sleeve is fixed outside the upright post and can be adjusted in height up and down, the rotating sleeve is mounted outside the fixed sleeve through a disc bearing and can freely rotate, and the lower support rod disc is mounted on the rotating sleeve and can freely rotate along with the rotating sleeve.

The fan support rod fixing device is characterized in that round holes are formed in the middles of the upper parallel support rod disc and the lower support rod disc, support rod seats used for installing fan support rods are evenly and symmetrically distributed on the outer edges of the upper parallel support rod disc and the lower support rod disc, and the support rod seats used for installing the fan support rods are evenly and symmetrically distributed on the outer edges of the upper support rod disc.

The telescopic mechanism and the lifting upright post can realize the multi-stage telescopic function, so that the upright post is lifted higher to improve the wind energy absorption efficiency.

The bumpers provide an upward pulling force to the blade assembly, which can balance the gravitational effects of the blade assembly as it is deployed to its maximum radius.

If the generator component adopts an inner rotor generator, the inner rotor needs to be axially installed, a parallel strut disc and an upper strut disc are installed on a shaft, and the distance between the parallel strut disc and the upper strut disc is equal to the distance between an upper support and a parallel support.

The control method of the foldable vertical axis wind turbine comprises the following implementation steps of a system state control strategy:

step A-1: controlling the telescopic rod of the telescopic mechanism to retract and descend to enable the blade assembly to be unfolded, enabling the included angle between the lower support rod and the fixed upright post to be not more than 90 degrees, enabling the blades to be in a parallel state with the upright post, and starting the system if wind exists;

step A-2: if the wind speed is larger than a set value, or the output power of the fan is required to be reduced, or the rotating speed of the fan is required to be reduced, the telescopic rod of the telescopic mechanism is controlled to extend out and jack the lifting upright upwards, all the blades are pulled upwards through the upper supporting rod and the parallel supporting rods, the included angle between the lower supporting rod and the fixed upright is gradually reduced, and the radius of the blade from the fixed upright is further reduced;

step A-3: if breeze power generation is needed, or the output power of the fan is needed to be improved, or the rotating speed of the fan is needed to be increased, the telescopic rods of the telescopic mechanisms are controlled to retract and descend, all the blades move downwards under the action of gravity and centrifugal force, so that the blade assemblies are unfolded, in the control process, the included angle between the lower support rod and the fixed upright post needs to be kept to a set value not larger than 90 degrees, and the radius of the blades from the fixed upright post is increased;

step A-4: if the fan breaks down, perhaps when needing the fan to shut down, control telescopic machanism's telescopic link stretches out and upwards will go up and down stand jack-up, through last branch and parallel strut with all blades upwards pull-up, contained angle between lower branch and the fixed post reduces gradually, until the blade is folded completely fixed post and is stretched out all around and pack up, makes the blade no longer absorb wind energy, and the electromagnetic braking of the generator of the re-control makes the fan brake fast.

Step A-5: if need shut down or when needing to contract folding, control telescopic machanism's telescopic link and withdraw and descend, all blades receive gravity and centrifugal force effect downstream, make down the contained angle between branch and the fixed post and reach 90 and stop, because the buffer pull-up force can balance the action of gravity of blade subassembly this moment, the blade subassembly slowly freely hangs down to fold around the fixed post.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages and effects:

the invention has the advantages that the blades can be completely unfolded and also can be completely folded and attached around the upright post, the volume is minimum, and the movement is convenient; deployment and folding stowing may be accomplished continuously by an automated control system.

The invention has the advantages of simple structure, low cost and no rotating disc sliding along the direction of the upright post, thereby having very high structural reliability, safety and service life.

The invention has the advantages that the telescopic mechanism can be arranged in the upright post, so that the telescopic mechanism is pushed up from the inside, the occupied space is reduced, and meanwhile, the control mechanism is prevented from being exposed outside, so that the waterproof, sun-proof and dustproof effects can be better realized, the reliability and the safety of the system are further improved, and the service life of the system is prolonged.

One effect of the invention is that by "collapsing" the uprights are lowered to a minimum, lower height than during normal operation, and therefore more portable.

The vertical column processing method has the advantages that the wind driven generator only needs to be fixed by the rolling bearing, and a rotating part which slides up and down is not arranged, so that the processing precision of the vertical column is reduced, and the system cost is saved.

The invention has the advantages that if the fan fails or needs to be stopped, the fan is folded to stop absorbing energy, the fan can be quickly braked and stopped by utilizing the electromagnetic braking of the generator, and the generator and the controller generate little heat in the stopping mode, thereby being beneficial to prolonging the service life.

One effect of the invention is that the invention does not have special radius adjusting struts, all the blade struts can bear the stress of the blades, and the strength, reliability, safety and service life of the folding device are effectively improved.

Drawings

FIG. 1 is a schematic view of the inner-pushing type vertical axis wind turbine with adjustable radius in an unfolded state;

FIG. 2 is a schematic view of the "jacking folded state" of the internal pushing type radius adjustable vertical axis wind turbine of the present invention;

FIG. 3 is a schematic view of the "collapsed state" of the inner-pushing type vertical axis wind turbine with adjustable radius according to the present invention;

FIG. 4 is a schematic view of a mast assembly of the internally-pushed radius-adjustable vertical axis wind turbine of the present invention;

FIG. 5 is a schematic view of a blade assembly of the inner-pushing type vertical axis wind turbine of the present invention;

FIG. 6 is a schematic view of a generator assembly of the internally pushed radius adjustable vertical axis wind turbine of the present invention;

FIG. 7 is a first schematic view illustrating a blade radius adjusting process and a folding process of the inner-pushing type radius-adjustable vertical axis wind turbine according to the present invention;

FIG. 8 is a schematic diagram of a second blade radius adjustment process and a folding process of the inner-pushing type radius-adjustable vertical axis wind turbine according to the present invention;

FIG. 9 is a third schematic view of the blade radius adjustment process and the folding process of the inner-pushing type radius-adjustable vertical axis wind turbine according to the present invention;

FIG. 10 is a fourth schematic view illustrating a blade radius adjusting process and a folding process of the inner-pushing type radius-adjustable vertical axis wind turbine according to the present invention;

FIG. 11 is a fifth schematic view illustrating a blade radius adjusting process and a folding process of the inner-pushing type radius-adjustable vertical axis wind turbine according to the present invention;

FIG. 12 is a sixth schematic view illustrating a blade radius adjusting process and a folding process of the inner-pushing type vertical axis wind turbine with an adjustable radius according to the present invention;

FIG. 13 is a cross-sectional view of the lower turntable of the inner-pushing type vertical axis wind turbine with adjustable radius according to the present invention;

FIG. 14 is a partial view of an upper mast plate of the internally-pushed vertical axis wind turbine with adjustable radius according to the present invention;

FIG. 15 is a drawing of the components of the parallel strut plate and the lower strut plate of the internally-pushed vertical axis wind turbine with adjustable radius according to the present invention;

FIG. 16 is a graph of blade radius adjustment versus strut angle for the internally pushed radius adjustable vertical axis wind turbine of the present invention.

In the drawings, each reference numeral represents a component:

1. column assembly, 2, blade assembly, 3, generator assembly, 101, fixed column, 102, telescoping mechanism, 103, lower rotary table, 104, bush, 105, lifting column, 106, mounting flange, 201, blade, 202, upper support, 203, parallel support, 204, lower support, 205, upper support, 206, parallel strut, 207, lower strut, 208, buffer, 301, stator flange, 302, stator shaft, 303, generator bearing, 304, outer rotor, 305, parallel strut disc, 306, upper strut disc, 1021, telescopic link, 1031, fixed sleeve, 1032, disc bearing, 1033, swivel sleeve, 1034, lower strut disc, 3051, strut seat, 3061, upper strut seat.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of an unfolded state of an internal pushing type vertical axis wind turbine with an adjustable radius, which mainly comprises a column assembly 1, a blade assembly 2 and a generator assembly 3. Fig. 4 is a schematic view of a mast assembly of the internally-pushed vertical axis wind turbine with adjustable radius according to the present invention, which includes an external view and a sectional view, wherein the mast assembly 1 includes a fixed mast 101, a telescoping mechanism 102, a lower turntable 103, a bushing 104, a lifting mast 105, and a mounting flange 106. The telescoping mechanism 102 may be implemented by a mechanical device such as an electric push rod, a hydraulic cylinder, a pneumatic cylinder, a worm gear, a ball screw, or the like. The control function of the telescopic mechanism 102 is realized by adopting an electric push rod in the embodiment. A mounting flange 106 is provided at the top end of the lifting column 105 for mounting the generator assembly 3. The telescoping rod 1021 of the telescoping mechanism 102 is attached to the bottom of the lifting column 105 and is capable of raising and retracting the lifting column 105. The lower turntable 103 is fixed to the mast 101 and provides a pivot point for the blade assembly 2. The lower rotary table 103 is fixed on the upright 101 and the up-down position and height can be adjusted. The bushing 104 is installed between the top end of the fixed column 101 and the elevating column 105. Firstly, the bush 104 can reduce the friction when the lift stand 105 rises and withdraws, secondly the bush 104 can play the effect of righting to the lift stand 105, and the bush 104 can play sealed effect once more, prevents rainwater, sand and dust invasion stand subassembly 1, improves the reliability, the security and the life of system.

Fig. 5 is a schematic view of a blade assembly of the internally-pushed vertical axis wind turbine with adjustable radius according to the present invention, wherein the blade assembly 2 comprises a blade 201, an upper support 202, a parallel support 203, a lower support 204, an upper support 205, a parallel support rod 206, a lower support rod 207, and a damper 208. The blade 201 can be made of composite materials, aluminum alloy sections and sheet metal parts of aluminum alloy through riveting, a girder and ribs are added in the middle for reinforcement, and an upper support 202, a parallel support 203 and a lower support 204 are arranged at proper positions of the girder.

The blade assembly 2 is mounted on the column assembly 1 and the generator assembly 3 such that the blades 201 are held parallel to the stationary mast 101, together with the upper struts 205 and the parallel struts 206, in a parallel four bar linkage configuration. Lower strut 207 may be parallel to upper strut 205 and parallel strut 206, forming a parallelogram four-bar linkage. An isosceles trapezoid four-bar linkage can also be formed with the upper support bar 205 and the parallel support bar 206. Since the isosceles trapezoid four-bar linkage is a stable structure, the angle θ between the two waists and the bottom of the quadrangle can be controlled, see fig. 11, to adjust the height of the quadrangle, and thus adjust the rotation radius and the swept area of the blade 201, and thus adjust the efficiency of the wind energy absorption of the wind turbine.

Wherein, one end of the buffer 208 is connected with the parallel support 203, and the other end is connected with the free end of the upper support rod 205, which generates inward and upward pulling force to the blade 201. The weight of part of the blades 201 can be balanced through the buffer, so that the pressure of the telescopic mechanism 102 is reduced, the cost is reduced, the energy required by the telescopic mechanism 102 for adjusting the height is reduced, and the service life of the telescopic mechanism 102 is prolonged.

The inward-pushing type vertical axis wind turbine with the adjustable radius is in a unfolding state as shown in fig. 1, and in the unfolding state, the blades 201 of the fan are parallel to the fixed upright posts 101, and the radius from the fixed upright posts 101 reaches the maximum, so that the fan can generate the maximum torque to drive the generator to generate electricity. Therefore, the wind power generation control device is suitable for starting of the wind power generator and wind power collection and power generation control under the condition of breeze. At this time, the angle θ between the lower support rod 207 and the fixed column 101 is not more than 90 °, and further, in order for the lower support rod 207 to provide an upward force to the blade assembly 2 so as to balance the gravity of the blade assembly 2, the angle θ may be generally set to about 80 °, as shown in fig. 11. The maximum included angle θ can be increased because the bumper 208 provides a partial upward pull.

In one embodiment, when the damper 208 can provide a balanced force of the entire weight of the blade assembly 2, the maximum angle θ between the lower support rod 207 and the fixed upright 101 can be set to 90 °, and the blade assembly 2 has the largest radius and the largest swept area, so that the wind energy can be absorbed to the maximum and the breeze power generation can be performed.

However, in this state, since the sweep radius of the blade 201 is large, it is not suitable for portability and movement, and especially when the blade is installed in different places in the field, the transportation is very inconvenient, the fan is easily damaged, and a large transportation space is occupied.

Fig. 2 is a schematic view of a "jacking folded state" of the internally-pushed radius-adjustable vertical axis wind turbine according to the present invention, and fig. 3 is a schematic view of a "collapsing folded state" of the internally-pushed radius-adjustable vertical axis wind turbine according to the present invention. For the convenience of transportation, the movable wind power generation system is made, the blade assembly 2 can be automatically folded around the upright post 101, the size is reduced, and the protection of the blade 201 in the transportation and moving processes is facilitated. The folded state has two forms, the first is a "jack-up folded" state as shown in fig. 2, which features the lifting column 105 fully extended; the second is a "collapsed" state as shown in fig. 3, which features the fully retracted lifting column 105. The jacking and folding state is mainly used for controlling the shutdown of the wind driven generator in normal work; while the "collapsed" state is primarily used during stowing, transferring and transporting of the aerogenerator blades 201, it may be the state where the height and lateral dimensions of the entire system are minimized.

When the inner-pushing type vertical axis wind turbine with the adjustable radius is lifted and folded, the lifting upright post 105 extends upwards to drive one end of the upper support rod 205 and one end of the parallel support rod 206 to move upwards. Since the lower rotary plate 103 is fixed to the stationary mast 101, the lower rod 207 is rotated upward, as shown in fig. 7, i.e., from fig. 9 to fig. 10, to finally reach the "jack-up-folded" state of fig. 7. Throughout the "jack-up folding" process, the blade 201 and the pillar assembly 1 are always kept parallel because the upper strut 205 and the parallel strut 206 form a parallelogram four-bar linkage with the pillar assembly 1 and the blade 201.

When the inner-pushing vertical axis wind turbine with the adjustable radius is folded in a 'shrinking mode', the lifting upright post 105 retracts downwards to drive one ends of the upper supporting rod 205 and the parallel supporting rod 206 to move downwards. Since the lower rotary plate 103 is fixed on the fixed upright 101 and thus the lower strut 207 rotates downward, the upper strut 205 and the parallel strut 206 form a parallelogram four-bar linkage structure with the upright assembly 1 and the blade 201, so that the blade 201 and the upright assembly 1 are always kept parallel and are continuously unfolded outward. This process is illustrated in fig. 8 to 9, and finally in fig. 10, when the state of fig. 10 is reached, the upper strut 205 and the parallel strut 206 are brought into parallel with the lower strut 207. Under the influence of the weight of the blade assembly 2, the blade 201 starts to move downwards, and as the buffer 208 balances the weight of part of the blade 201, the blade 201 slowly sags and finally tightens and folds around the mast assembly 1, completing the "shrink folding", see fig. 10 to 11, and finally reaching fig. 12.

When the blade assembly 2 is folded in place, the upright post assembly 1 can be placed in a horizontal state, so that the movement and the transportation are more convenient.

In this embodiment, the buffer 208 is implemented by a spring, and different tension forces can be set according to the extension length of the spring, so as to balance the weight of the blade 201 and reduce the impact when the blade sags.

In one embodiment, the buffer 208 is implemented using a rubber strip.

In one embodiment, the damper 208 is implemented using air springs, except that the air springs generate compression force rather than tension force, and thus are installed at the other two hanging points, i.e., the upper support 202 and the lower support 204.

Furthermore, when the fan is in the power generation state, as shown in fig. 9, if the fan fails or needs to be stopped, the lifting column 105 extends upwards, and drives one ends of the upper strut 205 and the parallel strut 206 to move upwards, and the "jack-up folding" state of fig. 7 is reached. Blade subassembly 2 is packed up and is folded fixed post 101 all around completely, makes blade 201 no longer absorb wind energy, controls generator electromagnetic braking again, makes the fan brake fast. According to the parking mode, the fan does not absorb wind energy any more, the rotational inertia of the folded fan is reduced greatly due to the fact that the radius of the folded fan is reduced, when the generator is subjected to electromagnetic braking, the fan can be braked and parked only by outputting smaller torque, energy consumed by the generator and the controller is smaller, heat is very small, and the service life is prolonged.

Fig. 6 is a schematic diagram of a generator assembly of the internal pushing type vertical axis wind turbine with adjustable radius according to the present invention, in this embodiment, the generator employs an external rotor. In fig. 6, the generator assembly 3 includes a stator flange 301, a stator shaft 302, a generator bearing 303, an outer rotor 304, a parallel strut disc 305, and an upper strut disc 306.

The generator adopts an outer rotor structure, the lower end of a stator shaft 302 is provided with a stator flange 301, an upper support rod disc 306 is arranged at the top end of an outer rotor 304, a parallel support rod disc 305 is arranged at the lower end of the outer rotor 304, and the outer rotor 304 is matched with the stator shaft 302 through a generator bearing 303. The parallel strut plate 305 has the same outer dimensions as the upper strut plate 306, and the upper strut seat 3061 and the strut seat 3051 are mounted at the same angular direction and on the same vertical line.

In one embodiment, the generator is an internal rotor configuration, with the stator housing mounted to a mounting flange 106 at the top of the lifting column 105, with the rotor output shaft facing vertically upward. And then an adapter plate which is the same as the outer rotor 304 is manufactured on the output shaft of the rotor. An upper strut plate 306 is mounted above the adapter plate and a parallel strut plate 305 is mounted below the adapter plate and is in complete parallel alignment with the upper strut plate 306.

Fig. 13 is a cross-sectional view of the lower turntable of the internally pushed vertical axis wind turbine with adjustable radius according to the present invention, wherein the lower turntable 103 comprises a fixed sleeve 1031, a disk bearing 1032, a rotating sleeve 1033, and a lower strut plate 1034.

In this embodiment, the parallel strut discs 305 and the lower strut discs 1034 have the same structure.

In one embodiment, the upper strut disc 306 is substantially the same size as the lower strut disc 1034.

In this embodiment, the fixing cover 1031 is directly fixed to the fixing post 101, and can be adjusted in height and position to lock the fixing cover 1031 to the fixing post 101 when a proper position is found. A disk bearing 1032 is mounted on the outer side of the fixing sleeve 1031, and a rotating sleeve 1033 is mounted on the disk bearing 1032. The runner 1033 is free to rotate about the fixed hub 1031 and the fixed column 101. A lower strut plate 1034 is mounted above the sleeve 1033.

Fig. 14 is a part view of an upper support plate of the internally-pushed type radius-adjustable vertical axis wind turbine of the present invention, and fig. 15 is a part view of a parallel support plate and a lower support plate of the internally-pushed type radius-adjustable vertical axis wind turbine of the present invention. In this embodiment, in order to make the system components interchangeable, the upper strut disc 306 component diagram is designed to have the same overall dimensions as the parallel strut disc 305 and the lower strut disc 1034 component diagram, and the connecting line of the points where the upper strut disc 306, the parallel strut disc 305 and the lower strut disc 1034 are connected with the blade assembly 2 (i.e. the upper strut mount 3061 and the strut mount 3051) is ensured to be perpendicular to the horizontal plane. The upper support rod disc 306, the parallel support rod disc 305 and the lower support rod disc 1034 are respectively provided with support rod seats (i.e. an upper support rod seat 3061 and a support rod seat 3051) which are symmetrically and uniformly distributed and are respectively used for connecting the upper support rod 206, the parallel support rod 206 and the lower support rod 207.

FIG. 7 is a first schematic view of the blade radius adjustment process and the folding process of the inner-pushing type vertical axis wind turbine with adjustable radius according to the present invention, FIG. 8 is a schematic diagram of a second blade radius adjustment process and a folding process of the inner-pushing type vertical axis wind turbine with adjustable radius according to the present invention, FIG. 9 is a third schematic view showing the blade radius adjusting process and the folding process of the internally-pushed vertical axis wind turbine with adjustable radius according to the present invention, FIG. 10 is a fourth schematic view showing the blade radius adjusting process and the folding process of the internally-pushed type vertical axis wind turbine with adjustable radius according to the present invention, FIG. 11 is a fifth schematic view showing a blade radius adjusting process and a folding process of the internally-pushed type vertical axis wind turbine according to the present invention, FIG. 12 is a sixth schematic view showing the blade radius adjusting process and the folding process of the internally-pushed vertical axis wind turbine with adjustable radius according to the present invention, FIG. 16 is a graph of blade radius adjustment versus strut angle for the internally pushed radius adjustable vertical axis wind turbine of the present invention.

In one embodiment, the wind turbine is in the "jack-up collapsed" state of FIG. 7 prior to startup. At this time, the lifting column 105 is lifted to the highest point, so that the upper strut 206, the parallel strut 206 and the lower strut 207 are completely opened, and the blade 201 is tightly attached to the periphery of the lifting column 105. The blades 201 cannot absorb wind energy and thus do not rotate, and thus cannot generate electricity.

In one embodiment, the lifting column 105 are lowered so that the upper struts 206, the parallel struts 206 and the lower struts 207 form an equilateral trapezoid structure, see fig. 8 and 9, at which point the radius of rotation R of the blade 201_FIs equal to

R_F＝Lsinθ+R

Where L is the length of lower strut 207, θ is the angle between lower strut 207 and stationary mast 101, see fig. 16, and R is the radius of lower strut plate 1034.

The angle theta can be adjusted by adjusting the telescopic distance of the lifting upright post 105, thereby adjusting the rotating radius R of the blade 201_F. By adjusting the rotation radius and the swept area of the blades 201, the power of the wind energy absorbed by the fan can be adjusted, so as to obtain the maximum power generation in a wider wind speed range.

In one embodiment, the angle θ between the lower strut 207 and the stationary mast 101 varies from 0 ° to 90 ° during normal operation. In this range, lower strut 207 provides upward support to blade 201, while bumper 208 also increases the partial balancing force.

When the included angle theta between the lower strut 207 and the fixed upright 101 is changed to 90 degrees, the upper strut 206, the parallel strut 206 and the lower strut 207 are completely parallel, the lower strut 207 cannot provide upward supporting force, and the blade 201 is slowly folded downwards under the action of gravity and the pulling force of the buffer 208, so that the contraction and folding process is completed.

In one embodiment, the control method for folding and unfolding the wind driven generator is divided into 6 parts, and the implementation steps are as follows:

step 1: the inner-pushing type vertical axis wind turbine with the adjustable radius is erected at a selected place, the generator assembly 3 and the telescopic mechanism 105 can be confirmed to operate normally, and the blades 201 cannot touch objects in the surrounding environment after the wind turbine is unfolded, so that the blades 201 are prevented from being damaged.

Step 2: the telescopic rod 1021 controlling the telescopic mechanism 102 retracts and descends, so that the blade assembly 2 is unfolded, the included angle between the lower support rod 207 and the fixed upright post 101 is not more than 80 degrees, meanwhile, the blade 201 is in a parallel state with the upright post 101, and if wind exists, the system starts to start.

And step 3: if the wind speed is greater than the set value, or the output power of the fan needs to be reduced, or the rotating speed of the fan needs to be reduced, the telescopic rods 1021 of the telescopic mechanisms 102 are controlled to extend out and jack the lifting upright posts 105 upwards, all the blades 201 are pulled upwards through the upper supporting rods 205 and the parallel supporting rods 206, the included angle between the lower supporting rods 207 and the fixed upright posts 101 is gradually reduced, and the radius of the blades 201 from the fixed upright posts 101 is further reduced.

And 4, step 4: if breeze power generation is needed, or the output power of the fan is needed to be improved, or the rotating speed of the fan is needed to be increased, the telescopic rods 1021 of the telescopic mechanisms 102 are controlled to retract and descend, all the blades 201 move downwards under the action of gravity and centrifugal force, the blade assembly 2 is unfolded, in the control process, the included angle between the lower supporting rod 207 and the fixed upright post 101 needs to be kept to reach a set value not larger than 80 degrees, and therefore the radius of the blades 201 from the fixed upright post 101 is increased.

And 5: if the fan breaks down or needs the fan to stop, the telescopic rod 1021 of the telescopic mechanism 102 is controlled to extend out and jack the lifting upright post 105 upwards, all the blades 201 are pulled upwards through the upper support rod 205 and the parallel support rod 206, the included angle between the lower support rod 207 and the fixing upright post 101 is gradually reduced until the blades 201 are completely folded around the fixing upright post 101 and extend out and retract, so that the blades 201 do not absorb wind energy any more, and then the generator is controlled to perform electromagnetic braking, so that the fan can perform rapid braking.

Step 6: if the machine needs to be stopped or folded, the telescopic rods 1021 of the telescopic mechanisms 102 are controlled to retract and descend, all the blades 201 move downwards under the action of gravity and centrifugal force, so that the included angle between the lower support rods 207 and the fixed upright post 101 reaches 90 degrees and stops, and the blade assembly 2 slowly and freely hangs down and is folded around the fixed upright post 101 because the upward pull force of the buffer 208 can balance the gravity action of the blade assembly 2.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention, and the invention is therefore not to be limited to the embodiments illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The inner-pushing type vertical axis wind turbine with the adjustable radius is characterized by comprising a stand column assembly (1), a blade assembly (2) and a generator assembly (3); the mounting flange (106) at the top end of the upright post assembly (1) is connected with the stator flange (301) at the lower end of the generator assembly (3); the upper support rod (205), the parallel support rod (206) and the lower support rod (207) of the blade assembly (2) are respectively connected with an upper support rod disc (306) and a parallel support rod disc (305) of the generator assembly (3) and a lower support rod disc (1034) arranged on the stand column assembly (1); as the lifting column (105) is raised, the blade assembly (2) "extends and retracts"; the blade assembly (2) is deployed as the lifting column (105) is lowered; when the lifting column (105) is lowered to the lower limit point, the blade assembly (2) "collapses".

2. A push-in radius adjustable vertical axis wind turbine as claimed in claim 1, wherein said mast assembly (1) comprises a fixed mast (101), a telescoping mechanism (102), a lower turntable (103), a bushing (104), a lifting mast (105), a mounting flange (106); the mounting flange (106) is arranged at the top end of the lifting upright post (105), the lower turntable (103) is fixed on the upright post (101) and the height of the lower turntable can be adjusted, and the telescopic mechanism (102) is fixed in the upright post (101); a telescopic rod (1021) in the telescopic mechanism (102) is connected with the bottom end of the lifting upright post (105) and can jack and retract the lifting upright post (105); the bushing (104) is arranged between the top end of the fixed upright post (101) and the lifting upright post (105).

3. The internally-pushed radius-adjustable vertical axis wind turbine as claimed in claim 1, wherein the blade assembly (2) comprises a blade (201), an upper bracket (202), a parallel bracket (203), a lower bracket (204), an upper strut (205), a parallel strut (206), a lower strut (207), a damper (208); the blade assembly (2) is arranged on the column assembly (1) and the generator assembly (3), so that the blades (201) are parallel to the fixed upright post (101) and form a parallel four-bar linkage structure together with the upper support rod (205) and the parallel support rod (206); the upper support (202) and the parallel support (203) are arranged on the blade (201), and the lower support (204) is respectively connected with the upper support rod (205), the parallel support rod (206) and the lower support rod (207) and can rotate freely; one end of the buffer (208) is connected with the parallel support (203), and the other end is connected with the free end of the upper support rod (205), so that inward and upward pulling force is generated on the blade (201).

4. A push-in radius adjustable vertical axis wind turbine as claimed in claim 1, wherein said generator assembly (3) comprises a stator flange (301), a stator shaft (302), a generator bearing (303), an outer rotor (304), a parallel strut disc (305), an upper strut disc (306); the generator adopts an outer rotor structure, a stator flange (301) is arranged at the lower end of a stator shaft (302), an upper support rod disc (306) is arranged at the top end of an outer rotor (304), a parallel support rod disc (305) is arranged at the lower end of the outer rotor (304), and the outer rotor (304) is matched with the stator shaft (302) through a generator bearing (303); the angle direction of the installation of the parallel strut disc (305) and the upper strut disc (306) is consistent.

5. A push-in radius adjustable vertical axis wind turbine as claimed in claim 2, wherein said lower turntable (103) comprises a fixed sleeve (1031), a disk bearing (1032), a rotating sleeve (1033), a lower strut disk (1034); the fixed sleeve (1031) is fixed outside the upright post (101) and can adjust the height up and down, the rotating sleeve (1033) is mounted outside the fixed sleeve (1031) through a disk bearing (1032) to rotate freely, and the lower support rod disk (1034) is mounted on the rotating sleeve (1033) and can rotate freely along with the rotating sleeve.

6. The push-in radius adjustable vertical axis wind turbine and the control method thereof as claimed in claim 1, wherein the upper parallel strut plate (305) and the lower strut plate (1034) have circular holes in the middle, strut seats (3051) for installing the wind turbine struts are uniformly and symmetrically distributed on the outer edge, and the upper strut plate (306) has the same uniform and symmetrical distribution of strut seats (3061) for installing the wind turbine struts on the outer edge.

7. The internally-pushed radius-adjustable vertical axis wind turbine as claimed in claim 2, wherein the telescoping mechanism (102) and the lifting column (105) can achieve multi-stage telescoping function to raise the column higher for improving wind energy absorption efficiency.

8. The internally pushed radius adjustable vertical axis wind turbine as claimed in claim 3, wherein the bumper (208) provides an upward pulling force to the blade assembly (2) which balances the gravitational effect of the blade assembly (2) when the blade assembly (2) is deployed to a maximum radius.

9. An internally pushed radius adjustable vertical axis wind turbine as claimed in claim 1, wherein said generator assembly (3) requires the internal rotor to be mounted axially if an internal rotor generator is used, the parallel strut disc (305) and the upper strut disc (306) are mounted on the shaft, and the distance between the parallel strut disc (305) and the upper strut disc (306) is equal to the distance between the upper mount (202) and the parallel mount (203).

10. The control method of the foldable vertical axis wind turbine according to any one of claims 1 to 9, wherein the system state control strategy is implemented by the following steps:

step A-1: controlling a telescopic rod (1021) of a telescopic mechanism (102) to retract and descend, so that a blade assembly (2) is unfolded, an included angle between a lower supporting rod (207) and a fixed upright post (101) is not more than 90 degrees, meanwhile, a blade (201) is in a parallel state with the upright post (101), and if wind exists, starting the system;

step A-2: if the wind speed is larger than a set value, or the output power of the fan is required to be reduced, or the rotating speed of the fan is required to be reduced, the telescopic rod (1021) of the telescopic mechanism (102) is controlled to extend out and jack up the lifting upright post (105), all the blades (201) are pulled up through the upper supporting rod (205) and the parallel supporting rods (206), the included angle between the lower supporting rod (207) and the fixed upright post (101) is gradually reduced, and the radius of the blades (201) from the fixed upright post (101) is further reduced;

step A-3: if breeze power generation is needed, or the output power of a fan is needed to be improved, or the rotating speed of the fan is needed to be increased, the telescopic rods (1021) of the telescopic mechanisms (102) are controlled to retract and descend, all the blades (201) move downwards under the action of gravity and centrifugal force to enable the blade assemblies (2) to be unfolded, and in the control process, the included angle between the lower supporting rod (207) and the fixed upright post (101) needs to be kept to reach a set value not larger than 90 degrees, so that the radius of the blades (201) from the fixed upright post (101) is increased;

step A-4: if the fan breaks down, or when the fan is required to be shut down, the telescopic rod (1021) of the control telescopic mechanism (102) stretches out and upwards jacks up the lifting upright post (105), all the blades (201) are upwards pulled up through the upper supporting rod (205) and the parallel supporting rod (206), the included angle between the lower supporting rod (207) and the fixed upright post (101) is gradually reduced until the blades (201) are completely folded around the fixed upright post (101) and stretch out and retract, so that the blades (201) can not absorb wind energy any more, the electromagnetic braking of the generator is controlled again, and the fan can be rapidly braked.

Step A-5: if the machine needs to be stopped or needs to be contracted and folded, the telescopic rod (1021) of the telescopic mechanism (102) is controlled to retract and descend, all the blades (201) move downwards under the action of gravity and centrifugal force, so that an included angle between the lower supporting rod (207) and the fixed upright post (101) reaches 90 degrees and stops, and the blade assembly (2) slowly and freely hangs down and is folded to the periphery of the fixed upright post (101) due to the fact that the buffer (208) pulls upwards at the moment to balance the action of gravity of the blade assembly (2).