Variable-diameter vertical axis wind power generation device

Abstract

The present application relates to the field of new energy wind power generation, in particular to a variable-diameter vertical axis wind power generation device, which comprises a wind energy absorption mechanism and a variable-diameter execution mechanism. The wind energy absorption mechanism is installed at the upper part of the device, converts wind energy into mechanical energy, and mainly comprises four semi-cylindrical wind blades staggered in two-stage support frames and a middle connecting mechanism. The variable-diameter execution mechanism is located at the bottom of the device, and can realize synchronous speed function and wind blade adjustment function. The synchronous speed function can ensure the stability of the relative opening of the wind blade and the smoothness of the wind power generator when the wind energy absorption mechanism is running. The wind blade adjustment function can effectively control the rotation of the wind blade, and then realize the change of the overlapping ratio and diameter of the wind blade while the wind energy absorption mechanism is rotating. The present application can significantly improve the starting performance of the vertical axis wind power generation device, increase the adaptability to the environment and the stability of the work, and at the same time, can better match the motor characteristics and improve the wind energy utilization coefficient of the power generation device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy wind power generation, in particular to a variable-diameter vertical axis wind power generation device. BACKGROUND

[0002] The wind power generation device can be divided into horizontal axis and vertical axis wind power generation device according to the relative position relationship between the main shaft and the horizontal plane. The horizontal axis wind power generation device has the advantages of high wind energy utilization rate, but it occupies a larger space, the control and regulation system is complex, and the environmental adaptability is relatively poor. At present, the vertical axis wind power generator has been widely used in small power generation system, which is mainly divided into resistance type and lift type. The traditional vertical axis wind power generation device cannot avoid the damage caused by bad weather to the power generation device, the environmental adaptability is poor, the wind blade starting performance is poor, the wind energy utilization coefficient is low, and the service life is generally short, which leads to poor popularization and application. In view of the above problems, the present application provides a variable-diameter vertical axis wind power generation device. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects of the prior art and provide a variable-diameter vertical axis wind power generation device. The blade overlap ratio and diameter are changed through the variable-diameter actuating mechanism, so as to improve the starting performance, power coefficient, environmental adaptability and service life of the wind power generation device.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme: a variable-diameter vertical axis wind power generation device, comprising a wind energy absorption mechanism and a variable-diameter actuating mechanism;

[0005] The wind energy absorption mechanism comprises four semi-cylindrical wind blades staggered in two levels of support frames, two levels of support frames and an intermediate connecting mechanism; the upper support frame is connected to the two ends of the stepped shaft at the upper end of the two semi-cylindrical wind blades, the stepped shaft extending from the middle of the rotating seat is installed in the bearing seat on the top plate of the upper support frame through the bearing, and the bottom plate of the upper support frame and the top plate of the lower support frame are fixed; the semi-cylindrical wind blades in the two levels of support frames are connected through the intermediate connecting mechanism;

[0006] The intermediate connecting mechanism comprises a gear shaft one, a gear one, a gear ring, a bearing one, a bearing seat one and a bearing two; the bearing seat one is installed on the top plate of the lower support frame, the bearing one is installed in the bearing seat one, the bearing two is installed in the bearing seat in the top plate of the lower support frame, the bearing one and the bearing two are in an upper and lower position relationship, and the fixed ring on the outer side of the gear ring is clamped between the inner rings of the bearing one and the bearing two; the mounting shaft extending from the bottom end of the semi-cylindrical wind blade in the upper support frame is connected through the shaft coupling, the stepped shaft extending from the top end of the semi-cylindrical wind blade in the lower support frame is connected with the gear one, and the gear shaft one and the gear one are engaged with the gear ring;

[0007] The variable diameter actuator comprises a cylinder, an upper cover plate, an upper cover and a bottom plate, and a partition plate is further arranged in the middle of the cylinder, a bearing eight and a bearing nine are arranged in the middle of the partition plate, the bearing eight and the bearing nine are coaxial and the bearing eight is above the bearing nine, and a bearing ten is arranged at the left and right ends of the partition plate; the bottom of a gear shaft four is installed on the bearing eight, the left and right two gear shaft threes are installed on the left and right sides of the top of the gear shaft four through the bearing seven, the two installation shafts protruding from the bottom end of the semicircular cylinder-shaped fan blade in the lower support frame are connected with the two gear shaft threes through the shaft coupling, the top of the gear shaft four is connected with the bottom of the upper cover, the bearing six is matched between the upper cover and the upper cover plate, the middle of the gear shaft four is further engaged with the left and right two gears two, the gear two is fixedly connected with the top end of a gear shaft five through the flat key, the bottom end of the gear shaft five is installed in the bearing thirteen on the bottom plate, the top of the left gear shaft five is installed on the bearing ten on the left side of the partition plate, the top of the right gear shaft five is installed on the bearing ten on the right side of the partition plate, the lower part of the gear shaft five is engaged with the gear shaft six, and the end part protruding from the bottom of the cylinder is connected with the external generator; a bevel gear shaft two is installed on the gear shaft six and is engaged with a bevel gear shaft one and a bevel gear shaft three, the top of the bevel gear shaft one is installed on the bearing nine, the bevel gear shaft three is installed on the bearing eleven on the bottom plate, the central axes of the bevel gear shaft one and the bevel gear shaft three coincide and are vertically spaced apart from the central axis of the bevel gear shaft two, the end part protruding from the bottom of the cylinder of the bevel gear shaft three is connected with the lower end adjustment motor; the top end of a gear shaft two is installed in the bearing four in the upper cover, the upper part of the gear shaft two is further engaged with the left and right two gear shaft threes, an external spline is processed below the gear shaft two, the gear shaft two is connected with the internal spline of the bevel gear shaft one through the gear shaft four, and the bearing three is further arranged in the gear shaft four and matched with the gear shaft two.

[0008] The variable-diameter actuating mechanism can realize the synchronous rotation function, and can ensure that the revolution speed of the gear shaft three around the gear shaft two is the same as the rotation speed of the gear shaft two, that is, the synchronous rotation function is realized. When the adjusting motor is not in action and the variable-diameter actuating mechanism does not perform the variable-diameter operation, the gear shaft three does not rotate, and the semi-cylindrical fan blade rotates under the action of the airflow, drives the gear shaft three to revolve around the gear shaft two, and drives the gear shaft four and the upper cover to rotate. At this time, assuming that the rotation speed of the gear shaft two is n, the rotation speed of the gear shaft four is n; the gear shaft four and the gear two are engaged at the same radius of the inscribed circle, so the rotation speed of the gear shaft five is also n; the gear shaft five and the gear shaft six are engaged at the diameter ratio of 1:2, so the rotation speed of the gear shaft six is 0.5n; since the adjusting motor does not rotate, the bevel gear shaft three does not rotate, so the rotation speed of the bevel gear shaft one is n, which is consistent with the rotation speed n of the gear shaft two, and the gear shaft three does not rotate relative to the gear shaft two. When the adjusting motor is in action, the variable-diameter actuating mechanism performs the variable-diameter operation, drives the bevel gear shaft three to rotate, and drives the bevel gear shaft two and the bevel gear shaft one to rotate. The bevel gear shaft one drives the gear shaft two and the gear shaft three to rotate relative to each other, drives the semi-cylindrical fan blade to rotate, and realizes the continuous change of the overlapping ratio and the diameter of the wind energy absorption mechanism. The present application can significantly improve the starting performance of the vertical axis wind power generation device, increase the adaptability to the environment and the stability of work; at the same time, the present application can better match the motor characteristics, and improve the wind energy utilization coefficient of the power generation device.

[0009] The semi-cylindrical fan blade has a semi-circular shape with a certain thickness, and the inner profile line of the end plate at both ends of the semi-cylindrical fan blade is S-shaped, so that the two semi-cylindrical fan blades can form a closed cylindrical body in the closed state.

[0010] The top end of the gear shaft five is provided with a baffle fixed by bolts, so that the axial movement of the gear two can be prevented.

[0011] Compared with the prior art, the present application has the following advantages:

[0012] 1. The present application has the advantages of compact overall structure, simple manufacturing, convenient maintenance, low working noise, high transmission precision of gear transmission, cost control, and easy popularization and application.

[0013] 2. The present application can realize the adjustment of the opening of the fan blade while the fan blade rotates, and further realize the variable-diameter (change of the overlapping ratio and the diameter of the fan blade) of the wind energy absorption mechanism, so as to improve the wind energy utilization coefficient, the starting performance, the environmental adaptability and the service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of a variable-diameter vertical axis wind power generation device.

[0015] Figure 2Schematic diagram of wind energy absorbing mechanism.

[0016] Figure 3 Schematic diagram of blade shape and size.

[0017] Figure 4 Schematic diagram of intermediate connecting mechanism.

[0018] Figure 5 Schematic diagram of variable diameter executing mechanism.

[0019] Figure 6 Partial enlarged view of variable diameter executing mechanism.

[0020] Figure 7 Schematic diagram of wind blade variable diameter process effect.

[0021] Figure 8 Vehicle speed change curve under four test conditions.

[0022] Figure 9 Blade diameter change curve with wind speed.

[0023] Figure 10 Blade wind power change curve under four conditions.

[0024] Figure 11 Generator angular velocity change curve under four conditions.

[0025] Legend in the figure:

[0026] I. Wind energy absorbing mechanism, II. Variable diameter executing mechanism.

[0027] 1-top plate, 2-rotating seat, 3-semi-cylindrical fan blade, 4-support frame, 5-bottom plate, 6-gear shaft one, 7-gear one, 8-pinion, 9-bearing one, 10-bearing seat one, 11-bearing two, 12-cylinder, 13-upper cover plate, 14-upper cover, 15-bearing three, 16-gear shaft two, 17-bearing four, 18-coupling, 19-bearing five, 20-gear shaft three, 21-bearing six, 22-bearing seven, 23-gear shaft four, 24-bolt, 25-gear two, 26-bearing eight, 27-bearing nine, 28-bearing ten, 29-bevel gear shaft one, 30-gear shaft five, 31-bevel gear shaft two, 32-gear shaft six, 33-bearing eleven, 34-bearing twelve, 35-baffle, 36-bearing thirteen, 37-bearing seat two, 38-bottom plate, 39-bevel gear shaft three. DETAILED DESCRIPTION

[0028] The technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Furthermore, taking the application of this wind power generation device in new energy vehicles as an example, a wind energy recovery power analysis will be conducted. Obviously, the described examples are merely a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] like Figure 1 As shown, a variable-diameter vertical-axis wind power generation device includes a wind energy absorption mechanism I and a variable-diameter actuator II. The wind energy absorption mechanism is as follows: Figure 2 As shown, the wind energy absorption mechanism I is installed at the top of the device to absorb wind energy and convert it into mechanical energy. It adopts a two-blade, two-stage structure. It mainly includes four semi-cylindrical wind blades 3 staggered within the upper and lower support frames, two support frames 4, and an intermediate connecting mechanism. The stepped shafts at the upper ends of the two semi-cylindrical wind blades 3 within the upper support frame 4 are connected to both ends of the rotating seat 2. The stepped shaft extending from the middle of the rotating seat 2 is mounted in a bearing seat on the top plate 1 of the upper support frame via bearings. The structure of the lower support frame is similar to that of the upper support frame, both including a top plate, a bottom plate, and a connecting rod connecting the top and bottom plates. The bottom plate of the upper support frame and the top plate of the lower support frame are fixed. The semi-cylindrical wind blades 3 in the two support frames are connected by the intermediate connecting mechanism. The semi-cylindrical fan blade 3 has a cross-sectional shape of a semi-circle with a certain thickness. The inner contour lines of the end plates at both ends of the semi-cylindrical fan blade 3 are "S"-shaped. In the closed state, the two semi-cylindrical fan blades 3 can form a closed cylindrical body. Figure 3 The main shape of the semi-cylindrical fan blade 3 is shown.

[0030] Figure 4 This is a schematic diagram of the intermediate connecting mechanism. The main function of the intermediate connecting mechanism is to fix and connect the two stages of semi-cylindrical fan blades 3 for power transmission. It includes gear shaft 6, gear 7, gear ring 8, bearing 9, bearing housing 10, and bearing 11. Bearing housing 10 is installed on the top plate of the lower-stage support frame 4. Bearing 9 is installed in bearing housing 10, and bearing 11 is installed in a bearing housing within the top plate of the lower-stage support frame 4. Bearings 9 and 11 are in an upper-lower position. The outer retaining ring of gear ring 8 is clamped between the inner rings of bearings 9 and 11. Gear shaft 6 is connected to the mounting shaft extending from the bottom of the semi-cylindrical fan blade 3 in the upper-stage support frame via a coupling. Gear 7 is connected to the stepped shaft extending from the top of the semi-cylindrical fan blade 3 in the lower-stage support frame. Both gear shaft 6 and gear 7 mesh with gear ring 8.

[0031] like Figure 5The variable diameter executing mechanism is installed on the bottom of the device, and mainly functions to adjust the opening of the wind blade while rotating, so as to realize the variable diameter of the wind energy absorbing mechanism, and to realize the synchronous rotating speed function and the wind blade adjusting function.

[0032] The variable diameter executing mechanism comprises a cylinder 12, an upper cover plate 13, an upper cover 14 and a bottom plate 38, and a partition plate is further arranged in the middle of the cylinder 12, the middle of the partition plate is provided with bearings eight 26 and nine 27, and the left and right ends of the partition plate are respectively provided with bearings ten 28. The bottom of the gear shaft four 23 is installed on the bearing eight 26, the left and right gear shafts three 20 are installed on the left and right sides of the top of the gear shaft four 23 through the bearings seven 22, and the two installation shafts protruding from the bottom end of the semicircular cylindrical wind blade 3 in the lower support frame 4 are connected with the two gear shafts three 20 through the shaft couplings 18, as shown in the enlarged view of the variable diameter executing mechanism. Figure 6 The top of the gear shaft four 23 is connected with the bottom of the upper cover 14, bearings six 21 are matched between the upper cover 14 and the upper cover plate 13, the middle of the gear shaft four 23 is further engaged with the left and right gears two 25, the top of the gear two 25 is fixedly connected with the top end of the gear shaft five 30 through a flat key, and the shaft end is installed with a baffle fixed through a bolt, which can prevent the gear two 25 from moving axially, the bottom end of the gear shaft five 30 is installed in the bearing thirteen 36 on the bottom plate 38, the upper part of the left gear shaft five 30 is installed on the bearing ten 28 on the left side of the partition plate, the upper part of the right gear shaft five 30 is installed on the bearing ten 28 on the right side of the partition plate, the lower part of the gear shaft five 30 is engaged with the middle gear shaft six 32, and the end part protruding from the bottom of the cylinder is connected with the external generator.

[0033] The middle bevel gear shaft two 31 is installed on the gear shaft six 32, and is engaged with the bevel gear shaft one 29 and the bevel gear shaft three 39 respectively, the top of the bevel gear shaft one 29 is installed on the bearing nine 27, the bevel gear shaft three 39 is installed on the bearing eleven 33 on the bottom plate 38, the central axes of the bevel gear shaft one 29 and the bevel gear shaft three 39 coincide, and are in a spatial vertical relationship with the central axis of the bevel gear shaft two 31, and the end part protruding from the bottom of the cylinder of the bevel gear shaft three 39 is connected with the lower end adjusting motor.

[0034] The top end of the gear shaft two 16 is installed in the bearing four 17 in the upper cover 14, the upper part of the gear shaft two 16 is further engaged with the left and right gear shafts three 20 on the left and right sides, the lower part of the gear shaft two 16 is processed with an external spline, the gear shaft two 16 is connected with the internal spline of the bevel gear shaft one 29 after passing through the gear shaft four 23, and the gear shaft four 23 is further provided with the bearing three 15 matched with the gear shaft two 16.

[0035] Wherein, the synchronous speed function is to ensure that the revolution speed of the gear shaft three 20 around the intermediate gear shaft two 16 is the same as the rotation speed of the gear shaft two 16, that is, the synchronous speed function is realized. The fan blade adjusting function is to generate the relative rotation speed between the gear shaft two 16 and the gear shaft three 20 by adjusting, and then drive the semi-cylindrical fan blade 3 to rotate, so as to realize the continuous change of the overlapping ratio and diameter of the fan blade of the wind energy absorption mechanism, and the effect of the fan blade diameter change process is shown in Figure 7 The specific process is as follows:

[0036] When the diameter change execution mechanism does not perform the diameter change operation, the gear shaft three 20 does not rotate, the semi-cylindrical fan blade 3 rotates under the action of the airflow, drives the gear shaft three 20 to revolve around the gear shaft two 16, and drives the gear shaft four 23 and the upper cover 14 to rotate together. At this time, assuming that the rotation speed of the gear shaft two 16 is n, the rotation speed of the gear shaft four 23 is n; the gear shaft four 23 and the gear two 25 are engaged at the same radius of the inscribed circle, so the rotation speed of the gear shaft five 30 is also n; the gear shaft five 30 and the gear shaft six 32 are engaged at the diameter ratio of 1:2 of the inscribed circle, so the rotation speed of the gear shaft six 32 is 0.5n; since the adjusting motor does not rotate, the bevel gear shaft three 39 also does not rotate, so the rotation speed of the bevel gear shaft one 29 is n, which is consistent with the rotation speed n of the gear shaft two 16, and the gear shaft three 20 does not rotate relative to the gear shaft two 16.

[0037] When the diameter change execution mechanism performs the diameter change operation, the adjusting motor drives the bevel gear shaft three 39 to rotate, and then drives the bevel gear shaft two 31 and the bevel gear shaft one 29 to rotate. The bevel gear shaft one 29 drives the gear shaft two 16 and the gear shaft three 20 to rotate relative to each other, and then drives the semi-cylindrical fan blade 3 to rotate, so as to realize the continuous change of the overlapping ratio and diameter of the fan blade of the wind energy absorption mechanism.

[0038] Application example: the variable-diameter vertical-axis wind power generation device provided by the present application has the advantages of small occupied space, simple maintenance, high wind energy utilization coefficient, excellent starting performance and strong environmental adaptability. Therefore, the present application is applied to a new energy vehicle, installed in the front part of the front grille of the vehicle, to realize effective recovery of wind energy, and then improve the energy utilization rate of the whole vehicle. The specific analysis process is as follows:

[0039] 1. Wind energy absorption mechanism model

[0040] As shown in Figure 3 , H is the blade height, d is the blade diameter, e p is the blade thickness, r is the eccentric distance, and D is the device diameter.

[0041] E w = mv 2 / 2 (1)

[0042] m = pA (t) · v (t) (2)

[0043] wherein p is air density, A is the area swept by the blade, v is wind speed (wind speed is approximately equal to vehicle speed), m is the mass of air swept by the blade, E w is the kinetic energy of air per second swept by the blade. Combining equation (1) and equation (2), the power can be calculated as follows:

[0044] E w = pA(t) - v 3 (t) / 2 (3)

[0045] After the wind passes through the blade, the wind speed cannot be reduced to zero. In other words, the air swept by the blade cannot transfer all the energy to the blade. Therefore, the blade can only receive part of the energy of the wind.

[0046]

[0047] P is the power obtained by the blade, c p is the wind energy utilization coefficient.

[0048] According to Betz's law, the maximum value of c p is 0.593. However, wind power generation devices are limited by installation location, structural damping and other factors, and the normal value of c p in practice is 0.4-0.45. Therefore, the value of c p of the present application is set to 0.4.

[0049] The wind energy absorbed by the wind energy absorption mechanism is mainly used for two parts: part of the energy is used for rotating components (E T ), such as gear rotation, blade rotation, generator rotor rotation, etc. The other part of the energy is used to neutralize the damping force generated by each part (E C ), such as meshing damping force between gears, electrical damping force of the generator, etc.

[0050] 1.1 Rotational energy of structural components

[0051] The rotational energy of each component is obtained by using the energy method, as follows:

[0052]

[0053] wherein J r and ω r are the rotational inertia and angular velocity of the gear ring, J g1 and ω g1 are the rotational inertia and angular velocity of the first gear, J gs1 and ω gs1 are the rotational inertia and angular velocity of the first gear shaft, and J s and ω s are the rotational inertia and angular velocity of the wind blade, J ge and ω geis the moment of inertia and angular velocity of the rotor of the DC generator, J gs2 and ω gs2 is the moment of inertia and angular velocity of the gear shaft two, J gs4 and ω gs4 is the moment of inertia and angular velocity of the gear shaft four, J g2 and ω g2 is the moment of inertia and angular velocity of the gear two, J gs5 and ω gs5 is the moment of inertia and angular velocity of the gear shaft five, J gs6 and ω gs6 is the moment of inertia and angular velocity of the gear shaft six, J bg1 and ω bg1 is the moment of inertia and angular velocity of the bevel gear shaft one, J bg2 and ω bg2 is the moment of inertia and angular velocity of the bevel gear shaft two.

[0054] Table 1 Gear and bevel gear parameters

[0055]

[0056] 1.2 Device damping force energy

[0057] The meshing damping between the gear shaft five and the gear two is as follows:

[0058]

[0059] In the formula: the damping ratio ξ is 0.03-0.17, and the value of the present application is 0.1; k g is the average value of the stiffness of the corresponding gear shaft five and gear two, r1 and r2 are the radii of the meshing gear shaft five and gear two, J1 and J2 are the moments of inertia of the meshing gear shaft five and gear two.

[0060] The resistive torque T ge caused by the electrical damping of the DC generator can be expressed as:

[0061]

[0062] In which k t is the rotational speed constant, k e is the torque constant, R i is the internal resistance of the generator, R e is the external resistance of the generator, C ge is the electromagnetic damping of the generator, ω ge is the angular velocity of the generator.

[0063] Therefore, the damping force power can be calculated as follows:

[0064]

[0065] C1 is the meshing damping between gear wheel two and gear shaft four; C2 is the meshing damping between gear shaft five and gear shaft six; C3 is the meshing damping between bevel gear shaft one and bevel gear shaft two; C4 is the meshing damping between bevel gear shaft two and bevel gear shaft three; ω bg3 is the angular velocity of bevel gear shaft three.

[0066] Further, the energy consumed by the damping force is as follows:

[0067] E C =∫P M dt (9) 1.2 Generator model

[0068] In this example, a DC generator is used. According to Newton's second law, the motion equation of the generator is:

[0069]

[0070] T m is the input torque of the generator. Further, the power generated by the DC generator is:

[0071]

[0072] The main parameters of the generator are shown in Table 2.

[0073]

[0074] 1.3 Efficiency analysis of variable-diameter vertical-axis wind power generation device

[0075] The efficiency of the variable-diameter vertical-axis wind power generation device can be expressed as:

[0076]

[0077] 2. Result analysis

[0078] Based on the above, a new energy electric vehicle is taken as the research object. Based on the four sets of actual working condition data of the vehicle driving in the city, the energy recovery effect of the variable-diameter vertical-axis wind power generation device installed on the vehicle is analyzed. The variable-diameter vertical-axis wind power generation device is installed on the front of the vehicle, close to the front grille, and the vehicle speed can be approximately equal to the wind speed. For example, Figure 8 is the vehicle speed curve of the four test working conditions. In the analysis process, in order to improve the wind energy utilization coefficient, the variable-diameter actuator adjusts the blade diameter according to the wind speed.

[0079] The blade diameter curve with wind speed change is as follows: Figure 9When the wind speed (vehicle speed) is between 0-12 m / s, the adjusting motor is in a running stop state, the blade diameter remains unchanged, and is maintained at 120 mm. When the wind speed is between 12 m / s and 20 m / s, the adjusting motor runs, and the blade diameter is proportionally reduced from 120 mm to 60 mm. When the wind speed exceeds 20 m / s, the adjusting motor adjusts to close the blades to avoid the blades running under the action of strong wind and affecting the service life of the device. According to equations (3) and (4), the blade wind suction power change curves under four working conditions are obtained, as shown in Figure 10 .

[0080] Comparison Figure 8 and Figure 10 It can be found that the change trend of power is consistent with the wind speed, and increases with the increase of the wind speed. The root mean square (RMS) values of the blade power under the four working conditions are 7.0 W, 7.1 W, 3.9 W and 5.1 W, respectively. Combined with equations (1), (5) and (9), the generator angular velocity change curves can be obtained, as shown in Figure 11 .

[0081] Comparison Figure 8 and Figure 11 It is found that when the wind speed is zero, the generator angular velocity first gradually decreases and then gradually increases. The reason for this phenomenon is that when the vehicle enters the parking state from the running state, the angular velocity of the generator slowly decreases under the action of the blade inertia. When the vehicle enters the running state from the parking state, the angular velocity of the motor also slowly increases under the action of the blade inertia.

Claims

1. A variable-diameter vertical-axis wind power generation device, characterized in that: Includes a wind energy absorption mechanism (Ⅰ) and a variable diameter actuator (Ⅱ); The wind energy absorption mechanism (Ⅰ) includes four semi-cylindrical wind blades (3) staggered in two-stage support frames, upper and lower support frames (4) and intermediate connecting mechanism; the stepped shafts at the upper ends of the two semi-cylindrical wind blades (3) in the upper support frame (4) are connected to both ends of the rotating seat (2), and the stepped shaft extending from the middle of the rotating seat (2) is installed in the bearing seat on the top plate (1) of the upper support frame through bearings. The bottom plate of the upper support frame (4) and the top plate of the lower support frame (4) are fixed, and the semi-cylindrical wind blades (3) in the two-stage support frames are connected through the intermediate connecting mechanism. The intermediate connecting mechanism includes gear shaft one (6), gear one (7), gear ring (8), bearing one (9), bearing seat one (10) and bearing two (11); bearing seat one (10) is installed on the top plate of the lower support frame (4), bearing one (9) is installed in bearing seat one (10), and bearing two (11) is installed in the bearing seat inside the top plate of the lower support frame (4). Bearing one (9) and bearing two (11) are in an upper and lower position relationship. The fixing ring on the outside of the gear ring (8) is clamped between the inner rings of bearing one (9) and bearing two (11); gear shaft one (6) is connected to the mounting shaft extending from the bottom of the semi-cylindrical fan blade (3) in the upper support frame through a coupling, gear one (7) is connected to the stepped shaft extending from the top of the semi-cylindrical fan blade (3) in the lower support frame, and both gear shaft one (6) and gear one (7) mesh with gear ring (8); The variable diameter actuator (II) includes a cylinder (12), an upper cover plate (13), an upper cover (14), and a bottom plate (38). A partition is also provided in the middle of the cylinder (12). Bearing 8 (26) and bearing 9 (27) are provided in the middle of the partition. Bearing 8 (26) and bearing 9 (27) are coaxial and bearing 8 (26) is located above bearing 9 (27). Bearing 10 (28) is provided at the left and right ends of the partition. The bottom of gear shaft 4 (23) is installed on bearing 8 (26). The two gear shafts 3 (20) on the left and right sides of the top of gear shaft 4 (23) are installed through bearing 7 (22). The lower support frame (4) The two mounting shafts extending from the bottom of the semi-cylindrical fan blade (3) are connected to the two gear shafts (20) via a coupling (18). The top of the gear shaft (23) is connected to the bottom of the cover (14). A bearing (21) is fitted between the cover (14) and the cover plate (13). The middle of the gear shaft (23) also meshes with the gears (25) on the left and right sides. The gears (25) are fixedly connected to the top of the gear shaft (30) via a flat key. The bottom of the gear shaft (30) is installed in the bearing (36) on the bottom plate (38). The bearing on the left side of the partition is installed above the gear shaft (30). On the tenth (28), the upper part of the right gear shaft five (30) is mounted on the bearing ten (28) on the right side of the partition plate, and the lower part of the gear shaft five (30) meshes with the gear shaft six (32). The bottom end extends out of the cylinder and connects to the external generator. The bevel gear shaft two (31) is mounted on the gear shaft six (32) and meshes with the bevel gear shaft one (29) and the bevel gear shaft three (39) respectively. The top of the bevel gear shaft one (29) is mounted on the bearing nine (27), and the bevel gear shaft three (39) is mounted on the bearing eleven (33) on the bottom plate (38). The central axes of the bevel gear shaft one (29) and the bevel gear shaft three (39) coincide. And it maintains a spatial perpendicular relationship with the central axis of the second bevel gear shaft (31). The bottom end of the third bevel gear shaft (39) extends out of the cylinder and is connected to the adjustment motor at the lower end. The top end of the second gear shaft (16) is installed in the bearing four (17) in the upper cover (14). The upper sides of the second gear shaft (16) also mesh with the third gear shaft (20) on the left and right sides. An external spline is machined below the second gear shaft (16). The second gear shaft (16) passes through the fourth gear shaft (23) and is connected to the internal spline of the first bevel gear shaft (29). The third bearing (15) is also provided inside the fourth gear shaft (23) to cooperate with the second gear shaft (16).

2. The variable diameter vertical axis wind power generation device according to claim 1, characterized in that: The cross-sectional shape of the semi-cylindrical fan blade (3) is a semi-circle with a certain thickness. The inner contour of the end plates at both ends of the semi-cylindrical fan blade (3) is S-shaped. In the closed state, the two semi-cylindrical fan blades (3) can form a closed cylindrical body.

3. A variable-diameter vertical-axis wind power generation device according to claim 1 or 2, characterized in that: The top of gear shaft five (30) is fitted with a baffle fixed by bolts to prevent gear two (25) from moving axially.

Images