Wind driven generator with differential device

Abstract

The invention belongs to the field of wind power generation, and particularly relates to a wind driven generator with a differential device. A vertical axis wind turbine with a differential device is characterized in that a rotating shaft is arranged on a fixed shaft, an upper fixed gear and a lower fixed gear are fixedly arranged on the upper portion and the lower portion of the rotating shaft respectively, a positioning bearing is further arranged in the middle of the rotating shaft, and an upper reset spring is arranged between the positioning bearing and the upper fixed gear; and a lower reset spring is arranged between the positioning bearing and the lower fixed gear. An upper sliding rail and a lower sliding rail are arranged at the upper end and the lower end of the inner wall of the resistance type blade respectively, an upper sliding gear and a lower sliding gear are connected into the upper sliding rail and the lower sliding rail respectively, the upper sliding gear is meshed with the upper fixed gear, the lower sliding gear is meshed with the lower fixed gear, and the upper sliding gear and the lower sliding gear slide in the upper sliding rail and the lower sliding rail. The wind driven generator can combine the advantages of a lift type fan and a resistance type fan, is easy to start at a low speed and can speed up at a high speed, so that the power of the fan is improved.

Description

Technical Field

[0001] The invention belongs to the field of wind power generation, and in particular relates to a wind power generator with a differential device. Background Art

[0002] A wind turbine is a device that converts wind energy into electrical energy. It is an important component of renewable energy technology. Its working principle is based on the power of wind acting on the wind rotor blades, causing the wind rotor to rotate, thereby driving the generator to generate electricity. As a renewable energy technology, wind power generation has many benefits: it does not produce greenhouse gases and other pollutants, which helps reduce air pollution and the impact of global climate change; wind energy is a renewable resource that will not be exhausted. Compared with fossil fuels, wind power generation helps to achieve long-term sustainable use of energy; with the promotion of wind power generation, it can reduce dependence on fossil fuels such as coal, oil and natural gas, reduce dependence on energy imports, and enhance energy security. Based on its various advantages, my country's wind power installed capacity has always been among the best in the world, and it is one of the world's largest wind power markets. With the increase in my country's support for renewable energy, wind power generation, as an important component, has also developed rapidly.

[0003] Traditional wind turbines are horizontal axis wind turbines (HAWT), while the emerging vertical axis wind turbine (VAWT) in recent years is a wind power generation device that uses a vertical axis to rotate. Compared with the traditional horizontal axis wind turbine (HAWT), VAWT has unique design and application advantages and has received more and more attention in recent years, such as strong adaptability and normal operation under any wind direction, simple and flexible installation and maintenance, and a wider range of applications.

[0004] For most of the current vertical axis wind turbines, a combination of lift-type fans (Dubois type) and resistance-type fans (Savigny type) is used to increase the overall output power of the fans. However, both types of fan blades have their own advantages and disadvantages. The characteristic of the resistance-type fan is that the wind speed requirement is relatively low when starting, but at the same time the upper limit of the speed is low, and it is difficult to exceed the wind speed; the characteristic of the lift-type fan blade is that under weak wind conditions, the instability of the fan blade angle of attack makes it difficult to start, and after starting, the fan blade with reference to the wing configuration can continuously increase the speed, far exceeding the wind speed, and the output power is high. After the two are combined in series, the problem of the lift type being difficult to start is solved, but in the process of continuous acceleration, the resistance type shows lag when running at high speed, which has a negative impact on the power output of the combined fan. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a vertical axis wind turbine with a differential device, which can combine the advantages of lift-type wind turbines and resistance-type wind turbines, is easy to start at low speeds, can speed up at high speeds, and improve the power of the wind turbine.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a vertical axis wind turbine with a differential device, a rotating shaft is arranged on a fixed shaft, the upper and lower ends of the rotating shaft are respectively connected to the upper and lower ends of the lift-type blades, and a resistance-type blade is arranged in the middle of the rotating shaft, and the resistance-type blade is located inside the lift-type blade.

[0007] An upper fixed gear and a lower fixed gear are fixedly arranged at the upper and lower parts of the rotating shaft respectively, and both the upper fixed gear and the lower fixed gear are bevel gears. A locating bearing is also arranged at the middle part of the rotating shaft, an upper return spring is arranged between the locating bearing and the upper fixed gear, a lower return spring is arranged between the locating bearing and the lower fixed gear, and a lower locating protrusion is arranged at the lower part of the locating bearing.

[0008] Then, from the base upwards, the rotating shaft is sequentially provided with a lower fixed gear, a lower sliding gear, a lower return spring, a lower positioning protrusion, a positioning bearing, an upper return spring, an upper sliding gear and an upper fixed gear.

[0009] The upper end and the lower end of the inner wall of the resistance type blade are respectively provided with an upper slide rail and a lower slide rail which are recessed inwards, and an upper slide gear and a lower slide gear are respectively connected to the upper slide rail and the lower slide rail, and a positioning slider is provided on the outer side of the upper slide gear and the lower slide gear, and the positioning slider slides in the slide rail, and a transverse upper positioning protrusion is provided on the inner wall of the resistance type blade.

[0010] The upper sliding gear is sleeved on the rotating shaft, and its upper end is meshed and connected with the upper fixed gear, and its lower end is connected to the upper end of the upper return spring, and the lower end of the upper return spring is connected to the upper positioning protrusion. The lower sliding gear is sleeved on the rotating shaft, and its lower end is meshed and connected with the lower fixed gear, and its upper end is connected to the lower end of the lower return spring, and the upper end of the lower return spring is connected to the lower positioning protrusion.

[0011] Preferably, limit slots are further provided on the slide rails at the upper and lower ends of the inner wall of the resistance-type blade, and the size of the limit slots is consistent with the size of the positioning slide blocks of the upper sliding gear and the lower sliding gear.

[0012] Preferably, when stationary, the upper return spring and the lower return spring are both in a natural state, and the upper fixed gear and the upper sliding gear, and the lower fixed gear and the lower sliding gear are tightly meshed.

[0013] Preferably, when the rotation speed of the lift-type blade exceeds the upper limit of the rotation speed of the resistance-type blade, the positioning sliders of the upper sliding gear and the lower sliding gear move from the slide rail to the limit slot, and the upper return spring and the lower return spring are both in a compressed state, so that the upper fixed gear and the upper sliding gear, the lower fixed gear and the lower sliding gear are disengaged, and the resistance-type blades are disengaged from the rotating shaft and rotate.

[0014] Preferably, the upper sliding gear and the lower sliding gear include an inner wall and an outer wall, wherein the inner wall is tightly connected to the rotating shaft, and the outer wall is connected to the slide rail of the resistance-type blade via a positioning slider.

[0015] Preferably, the inner wall and the outer wall of the upper sliding gear and the lower sliding gear are connected by balls.

[0016] Preferably, four positioning sliders are arranged on the outer walls of the upper sliding gear and the lower sliding gear, and four upper sliding rails and four lower sliding rails are arranged on the resistance-type blades, and they cooperate with the positioning sliders one by one.

[0017] Preferably, the upper portion of the positioning bearing is connected to an upper positioning protrusion on the inner wall of the resistance type blade.

[0018] Preferably, the locating bearing is a ball bearing.

[0019] The beneficial effects of the present invention are as follows: the resistance blade and the lift blade are connected by a helical gear. When starting, the speed of the resistance blade is relatively fast and plays a leading role. The right-angle surface at the meshing position of the helical gear contacts and drives the lift blade to rotate. When the speed is sufficient and exceeds the upper limit of the speed of the resistance blade, the speed of the lift blade exceeds that of the resistance blade, the gear bevel contacts and bears force, and the two bevel gears gradually move relative to each other along the bevel at the meshing position. The upper sliding gear connected to the upper part of the resistance blade moves downward, and the lower sliding gear connected to the lower part of the resistance blade moves upward, until the upper sliding gear is disengaged from the upper fixed gear and the lower sliding gear is disengaged from the lower fixed gear. Then, the resistance blade and the lift blade are separated and the two no longer rotate together. The lift blade still drives the rotating shaft to rotate together, while the resistance blade rotates autonomously. Since the resistance blade is connected to the rotating shaft through a positioning bearing, due to the presence of the ball, even if the speed of the resistance blade is slow, it will not have a significant impact on the speed of the rotating shaft. When the speed of the lift blade is lower than the upper speed limit of the resistance blade, the speed of the resistance blade is greater than that of the lift blade, and the two gradually mesh until the right-angled surfaces at the meshing position are in close contact, pushing the lift blade to rotate again. The upper sliding gear and the lower sliding gear connected at the upper and lower ends of the resistance blade move up and down through the compression and reset operation of the upper return spring and the lower return spring, realizing the disengagement and engagement of the upper sliding gear and the upper fixed gear, and the lower sliding gear and the lower fixed gear, and finally realizing the disengagement and connection between the lift blade and the resistance blade, so as to achieve the purpose of increasing the wind turbine power. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Fig. 1 is a schematic structural diagram of the present invention; Fig. 2 is a schematic diagram of the internal structure of the present invention; FIG3 is a schematic diagram of the structure of a resistance-type blade in the present invention; FIG4 is a schematic diagram of the structure of the rotating shaft in the present invention; FIG5 is a schematic diagram of the structure of the slide rail in the present invention; FIG6 is a schematic diagram of the structure of the upper sliding gear in the present invention; FIG7 is a schematic diagram of the structure of the rotating shaft when the gears are meshing in the present invention; FIG. 8 is a schematic diagram of the structure of the upper sliding gear positioning slider embedded in the limiting slot in the present invention.

[0021] Reference numerals: 1. Base; 2. Fixed shaft; 3. Rotating shaft; 31. Upper fixed gear; 32. Lower fixed gear; 33. Positioning bearing; 34. Upper return spring; 35. Lower positioning protrusion; 36. Lower return spring; 4. Lift-type blade; 5. Resistance-type blade; 51. Upper slide rail; 52. Lower slide rail; 53. Upper sliding gear; 54. Lower sliding gear; 55. Positioning slider; 56. Limiting slot; 57. Upper positioning protrusion. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the mechanism of the present invention.

[0023] like Figure 1 As shown, a vertical axis wind turbine with a differential device includes a base 1, an upward fixed axis 2 is arranged on the base 1, a rotating axis 3 is arranged on the fixed axis 2, the upper and lower ends of the rotating axis 3 are connected to the upper and lower ends of the lift type blades 4, a resistance type blade 5 is arranged in the middle of the rotating axis 3, and the resistance type blade 5 is located inside the lift type blade 4.

[0024] like Figure 2 and Figure 4 As shown, an upper fixed gear 31 and a lower fixed gear 32 are fixedly provided at the upper and lower parts of the rotating shaft 3 respectively, and the upper fixed gear 31 and the lower fixed gear 32 are both bevel gears. A locating bearing 33 is also provided at the middle part of the rotating shaft 3, an upper return spring 34 is provided between the locating bearing 33 and the upper fixed gear 31, a lower return spring 36 is provided between the locating bearing 33 and the lower fixed gear 32, and a lower locating protrusion 35 is provided at the lower part of the locating bearing 33.

[0025] like Figure 3 As shown, the upper end and the lower end of the inner wall of the resistance type blade 5 are respectively provided with an inwardly recessed upper slide rail 51 and a lower slide rail 52, and an upper slide gear 53 and a lower slide gear 54 are respectively connected to the upper slide rail 51 and the lower slide rail 52. The outer sides of the upper slide gear 53 and the lower slide gear 54 are provided with a positioning slider 55, and the positioning slider 55 slides in the slide rail. A horizontal upper positioning protrusion 57 is provided on the inner wall of the resistance type blade 5.

[0026] like Figure 5 and Figure 6 As shown, the upper slide rail 51 and the lower slide rail 52 at the upper and lower ends of the inner wall of the resistance type blade 5 are also provided with a limit slot 56, and the size of the limit slot 56 is consistent with the size of the positioning slider 55 of the upper sliding gear 53 and the lower sliding gear 54. Four positioning sliders 55 are provided on the outer walls of the upper sliding gear 53 and the lower sliding gear 54, and four upper slide rails 51 and lower slide rails 52 matched with the positioning sliders 55 are provided on the inner wall of the resistance type blade 5.

[0027] The positioning bearing 33 is a ball bearing, whose inner wall is tightly connected to the rotating shaft 3, and whose upper end is connected to the upper positioning protrusion 57 on the inner wall of the resistance type blade 5. The upper end of the upper positioning protrusion 57 is connected to the upper return spring 34, and its lower end is connected to the positioning bearing 33 through a ball.

[0028] like Figure 8 As shown, the upper sliding gear 53 is sleeved on the rotating shaft 3, and its upper end is meshed and connected with the upper fixed gear 31, and its lower end is connected to the upper end of the upper return spring 34, and the lower end of the upper return spring 34 is connected to the upper positioning protrusion 57. The lower sliding gear 54 is sleeved on the rotating shaft 3, and its lower end is meshed and connected with the lower fixed gear 32, and its upper end is connected to the lower end of the lower return spring 36, and the upper end of the lower return spring 36 is connected to the lower positioning protrusion 35. The upper sliding gear 53 and the lower sliding gear 54 include an inner wall and an outer wall, and the inner wall is tightly connected to the rotating shaft 3, and the outer wall is connected to the slide rail of the resistance type blade 5 through the positioning slider 55. The inner wall and the outer wall of the upper sliding gear 53 and the lower sliding gear 54 are connected by balls.

[0029] From the base 1 upwards, the rotating shaft 3 is provided with a lower fixed gear 32, a lower sliding gear 54, a lower return spring 36, a lower positioning protrusion 35, a positioning bearing 33, an upper return spring 34, an upper sliding gear 53 and an upper fixed gear 31 in sequence.

[0030] The upper sliding gear 53 is sleeved on the rotating shaft 3, and the upper end is meshed and connected with the upper fixed gear 31, the lower end of the upper sliding gear 53 is connected to the upper positioning protrusion 57 through the upper return spring 34, the lower sliding gear 54 is sleeved on the rotating shaft 3, and the lower end is meshed and connected with the lower fixed gear 32, and the upper end of the lower sliding gear 54 is connected to the lower positioning protrusion 35 through the lower return spring 36.

[0031] like Figure 7As shown, when stationary, the upper return spring 34 and the lower return spring 36 are both in a natural state, and the upper fixed gear 31 and the upper sliding gear 53, and the lower fixed gear 32 and the lower sliding gear 54 are tightly meshed. When the speed of the lift-type blade 4 exceeds the upper speed limit of the resistance-type blade 5, the positioning sliders 55 of the upper sliding gear 53 and the lower sliding gear 54 move from the slide rail to the limit slot 56, and the upper return spring 34 and the lower return spring 36 are both in a compressed state, so that the upper fixed gear 31 and the upper sliding gear, and the lower fixed gear 32 and the lower sliding gear 54 are disengaged, and the resistance-type blade 5 is separated from the rotating shaft 3 and rotates.

[0032] The positioning bearing 33 is a ball bearing, and the upper portion of the positioning bearing 33 is connected to the upper positioning protrusion 57 on the inner wall of the resistance type blade 5 .

[0033] The differential device of the present invention refers to the cooperation between the upper fixed gear 31 and the upper sliding gear 53, and the cooperation between the lower fixed gear 32 and the lower sliding gear 54. The upper fixed gear 31 is fixedly connected to the rotating shaft 3, and the upper sliding gear 53 is affected by the expansion and contraction of the upper return spring 34, and is in a state of being closely meshed or separated from the upper fixed gear 31. When the upper fixed gear 31 and the upper sliding gear 53 are closely meshed, the upper return spring 34 is in a natural state, and the positioning slider 55 of the upper sliding gear 53 is located in the slide rail 53; when the upper fixed gear 31 and the upper sliding gear 53 are separated, the upper return spring 34 is in a compressed state, and the positioning slider 55 of the upper sliding gear 53 is located in the limiting slot 56 in the slide rail 53, and the upper return spring 34 is limited therein to prevent it from rebounding back to its original position. The movement of the lower fixed gear 32, the lower sliding gear 54 and the lower return spring 36 is the same, except that the positions of the lower fixed gear 32, the lower sliding gear 54 and the lower return spring 36 are mirror-symmetrical with the positions of the upper fixed gear 31, the upper sliding gear 53 and the upper return spring 34 along the positioning bearing 33, so the movement direction is also opposite. That is, when the upper return spring 34 is compressed, it moves vertically downward, and at the same time drives the upper sliding gear 53 to move downward into the limit slot 56 in the upper slide rail 51; and when the lower return spring 36 is compressed, it moves vertically upward, and at the same time drives the lower sliding gear 54 to move upward into the limit slot 56 in the lower slide rail 52.

[0034] like Figure 6 and Figure 7 As shown, the principle of relative movement between the upper fixed gear 31 and the upper sliding gear 53 is: the upper fixed gear 31 is connected to the rotating shaft 3, and then connected to the lift-type blade 4; the upper sliding gear 53 is embedded in the upper slide rail 51 through the positioning slider 55 to connect the resistance-type blade 5, so the meshing surface between the upper fixed gear 31 and the upper sliding gear 53 is mainly affected by the rotation speed of the lift-type blade 4 and the resistance-type blade 5.

[0035] When the speed of the lift blade 4 is slower than that of the drag blade 5, the speed of the upper sliding gear 53 is faster, and the upper fixed gear 31 and the upper sliding gear 53 are meshed through a right-angle surface, thereby achieving the purpose of driving the upper fixed gear 31 to rotate; when the speed of the lift blade 4 gradually increases to be greater than that of the drag blade 5, the speed of the upper fixed gear 31 is faster, and the two are meshed through an inclined surface. As the speed difference between the lift blade 4 and the drag blade 5 gradually increases, the upper sliding gear 53 gradually moves backward along the inclined surface of the upper fixed gear 31 until it is separated from the upper fixed gear 31. During this period, the upper reset spring 34 is gradually compressed and moves downward to the vertical position of the limit slot 56. Since the inner wall of the upper sliding gear 53 is connected to the rotating shaft 3, the rotating shaft 3 will give the upper sliding gear 53 a small clockwise torque, thereby pushing the positioning slider 55 on the upper sliding gear 53 to move horizontally inward and embed into the position of the limit slot 56, achieving the purpose of limiting the spring rebound reset.

[0036] When the rotation speed of the lift-type blade 4 gradually decreases to be lower than the rotation speed of the resistance-type blade 5, the rotation speed of the upper fixed gear 31 is slower, and the rotation speed of the rotating shaft 3 slows down. Therefore, the inner wall speed of the upper sliding gear 53 connected to the rotating shaft 3 is also slower than the outer wall speed of the upper sliding gear 53 connected to the upper slide rail 51 of the resistance-type blade 5. The outer wall of the upper sliding gear 53 will receive a smaller counterclockwise torque, which can prompt the positioning slider 55 to move horizontally outward from the limit slot 56 and disengage from the position of the limit slot 56. Under the action of the rebound force of the upper return spring 34, the upper sliding gear 53 gradually moves upward and gradually meshes along the inclined surface until the upper sliding gear 53 and the upper fixed gear 31 are tightly meshed with each other at a right angle and rotate together.

[0037] Considering that the differential device is a purely mechanical passive device that does not require manual work, strict requirements should be imposed on material selection, processing, and assembly. The minimum torque M that can cause the upper return spring 34 to enter or escape from the limit slot 56 should satisfy the following formula (parameters should be added and modified according to actual application conditions): , where k is the selected spring stiffness coefficient, μ is the wall friction coefficient of the slot, △δ is the axial displacement of the sliding gear in the slot from the original position, and R max It is the distance from the outermost end of the positioning slider 55 to the axis.

[0038] The relative movement principle of the lower fixed gear 32 and the lower sliding gear 54 is the same as the above, except that due to the mirror symmetry of the positions, the vertical movement directions thereof are opposite.

[0039] In this invention, the limit slot 56 extends and is recessed to one side in the horizontal direction inside the slide rail 53, with the purpose of positioning the compressed spring here to ensure that when the rotation speed of the lift-type blade 4 is higher than that of the resistance-type blade 5, the spring can always remain in a compressed state, so that the upper sliding gear 53 and the upper fixed gear 31 always remain separated, and the lift-type blade 4 and the resistance-type blade 5 rotate separately.

[0040] In the present invention, the connection between the upper sliding gear 53, the lower sliding gear 54, the positioning bearing 33 and the upper positioning protrusion 57 is all in the form of a ball, which is to reduce energy loss. When the resistance-type blade 5 drives the lift-type blade 4 to rotate, the gear teeth on the outer wall of the upper sliding gear 53 and the lower sliding gear 54 drive the upper fixed gear 31 and the lower fixed gear 32 to rotate through the meshing of the gears, and the components on the entire rotating shaft 3 rotate together; and when the resistance-type blade 5 and the lift-type blade 4 rotate separately, the upper sliding gear 53, the lower sliding gear 54 and the inner wall of the positioning bearing 3 all rotate together with the rotating shaft 3, and their outer walls are connected to the resistance-type blade 5, and the rotation speed of the outer wall is slower, but the inner wall and the outer wall are connected by a ball, and the resistance brought by the outer wall is greatly reduced, so the resistance-type blade 5 does not affect the rotation speed of the lift-type blade 4, thereby achieving the purpose of increasing the power of the generator.

[0041] In summary, the working mode of the generator involved in this invention includes three stages: When starting: Since the resistance blade 5 has a lower requirement for wind speed, the resistance blade 5 starts first. At this time, the upper sliding gear 53 and the upper fixed gear 31, the lower sliding gear 54 and the lower fixed gear 32 are tightly meshed at the same time, and the spring is in a natural state. As the speed of the resistance blade 5 gradually increases, the lift blade 4 is gradually driven to rotate until the speed of the lift blade 4 is consistent with the speed of the resistance blade 5.

[0042] At high speed: the rotation speed of the lift blade 4 gradually increases to be greater than the rotation speed of the resistance blade 5. The speed difference between the two makes the meshing between the upper sliding gear 53 and the upper fixed gear 31, and the lower sliding gear 54 and the lower fixed gear 32 no longer so tight, and the meshing surface gradually changes from a right-angle surface to an inclined surface, so that the upper sliding gear 53 gradually moves downward, and the lower sliding gear 54 gradually moves upward. At the same time, the upper return spring 34 moves downward, and the lower return spring 36 moves upward, and then the positioning slider 55 of the upper sliding gear 53 moves downward along the upper slide rail 51, and the positioning slider 55 of the lower sliding gear 54 moves upward along the lower slide rail 52, until the clockwise torque M given by the rotating shaft 3 to the outer wall of the upper sliding gear 53 and the lower sliding gear 54 meets the minimum torque. , where k is the selected spring stiffness coefficient, μ is the wall friction coefficient of the slot, △δ is the axial displacement of the sliding gear in the slot from the original position, and R maxis the distance from the outermost end of the positioning slider 55 to the axis center; at this time, the upper sliding gear 53 and the upper fixed gear 31 are disengaged, and the lower sliding gear 54 and the lower fixed gear 32 are disengaged.

[0043] When M is greater than this value, the positioning slider 55 enters the limiting slot 56, the upper return spring 34 and the lower return spring 36 are limited, and the lift-type blade 4 and the resistance-type blade 5 rotate respectively.

[0044] At low speed: the rotation speed of the lift-type blade 4 gradually decreases to a speed less than that of the resistance-type blade 5. When the counterclockwise torque M applied by the rotating shaft 3 to the outer walls of the upper sliding gear 53 and the lower sliding gear 54 meets the minimum torque, the positioning slider 55 slides out of the limit slot 56, and the upper return spring 34 rebounds and moves upward; the lower return spring 36 rebounds and moves downward, then the upper sliding gear 53 gradually moves upward and gradually meshes with the upper fixed gear 31 along the inclined surface, and the lower sliding gear 54 gradually moves downward and gradually meshes with the lower fixed gear 32 along the inclined surface, until the upper return spring 34 and the lower return spring 36 are completely reset, the upper sliding gear 53 and the upper fixed gear 31, the lower sliding gear 54 and the lower fixed gear 32 are tightly meshed, and the resistance-type blade 5 once again plays the advantage of easy starting, which helps to speed up the lift-type blade 4.

[0045] Until the lift-type blade 4 increases its rotation speed again and provides a torque M to embed the upper return spring 34 and the lower return spring 36 into the limit groove 56, the lift-type blade 4 and the resistance-type blade 5 are separated and rotated separately.

[0046] It should be noted that the upper positioning protrusion 57 is fixedly mounted on the inner side of the resistance-type blade 5, and its lower surface contacts the outer side of the positioning bearing 33. The lower positioning protrusion 35 is fixedly mounted on the rotating shaft 3, and its upper surface contacts the lower surface of the inner side of the positioning bearing 33, so as to avoid energy loss.

[0047] The contact between the positioning bearing 33 and the upper positioning protrusion 57 can also support and stabilize the resistance type blade 5, thereby preventing the resistance type blade 5 from having no supporting point in the middle of the cylindrical structure and causing unstable operation.

[0048] It should be noted that, in order to simplify the text, when describing the structure and principle, only the upper fixed gear 31 and the upper sliding gear are taken as examples, and the structures of the lower fixed gear 32 and the lower sliding gear 54 should be mirror-symmetrical to them and have the same principle.

[0049] Embodiment 2: Figure 7In the gear tooth direction of the upper sliding gear 53, the upper fixed gear 31, the lower sliding gear 54 and the lower fixed gear 32, in the top view, the lift blade 4 and the resistance blade 5 are both rotated in the clockwise direction, and the limit slot 56 should start on the side of the slide rail 53 along the clockwise rotation direction. Obviously, if the gear tooth direction of the upper sliding gear 53, the upper fixed gear 31, the lower sliding gear 54 and the lower fixed gear 32 is opposite, then in the top view, the lift blade 4 and the resistance blade 5 are both rotated in the counterclockwise direction, and the limit slot 56 should start on the side of the slide rail 53 along the counterclockwise rotation direction.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vertical axis wind turbine with a differential device, comprising a base, on which an upward fixed shaft is arranged, characterized in that: A rotating shaft is arranged on the fixed shaft, and the upper and lower ends of the rotating shaft are respectively connected to the upper and lower ends of the lift-type blades. A drag-type blade is arranged in the middle of the rotating shaft, and the drag-type blade is located inside the lift-type blade. An upper fixed gear and a lower fixed gear are fixedly arranged at the upper and lower parts of the rotating shaft respectively, and both the upper fixed gear and the lower fixed gear are helical gears. A positioning bearing is also arranged at the middle part of the rotating shaft, an upper return spring is arranged between the positioning bearing and the upper fixed gear, a lower return spring is arranged between the positioning bearing and the lower fixed gear, and a lower positioning protrusion 35 is arranged at the lower part of the positioning bearing. The upper end and the lower end of the inner wall of the resistance type blade are respectively provided with an upper slide rail and a lower slide rail which are recessed inwards, and an upper slide gear and a lower slide gear are respectively connected in the upper slide rail and the lower slide rail, and a positioning slider is provided on the outer side of the upper slide gear and the lower slide gear, and the positioning slider slides in the slide rail, and a horizontal upper positioning protrusion is provided on the inner wall of the resistance type blade, The upper sliding gear is sleeved on the rotating shaft, and its upper end is meshed and connected with the upper fixed gear, and its lower end is connected to the upper end of the upper return spring, and the lower end of the upper return spring is connected to the upper positioning protrusion. The lower sliding gear is sleeved on the rotating shaft, and its lower end is meshed and connected with the lower fixed gear, and its upper end is connected to the lower end of the lower return spring, and the upper end of the lower return spring is connected to the lower positioning protrusion.

2. A vertical axis wind turbine with a differential device according to claim 1, characterized in that: Limiting slots are also arranged on the slide rails at the upper and lower ends of the inner wall of the resistance-type blade, and the size of the limiting slots is consistent with the size of the positioning slide blocks of the upper sliding gear and the lower sliding gear.

3. A vertical axis wind turbine with a differential device according to claim 2, characterized in that: When stationary, the upper return spring and the lower return spring are both in a natural state, and the upper fixed gear and the upper sliding gear, and the lower fixed gear and the lower sliding gear are tightly meshed.

4. A vertical axis wind turbine with a differential device according to claim 3, characterized in that: When the speed of the lift-type blade exceeds the upper speed limit of the resistance-type blade, the positioning sliders of the upper sliding gear and the lower sliding gear move from the slide rail to the limit slot, and the upper return spring and the lower return spring are both in a compressed state, so that the upper fixed gear and the upper sliding gear, the lower fixed gear and the lower sliding gear are disengaged, and the resistance-type blade disengages from the rotating shaft and rotates.

5. A vertical axis wind turbine with a differential device according to claim 3 or 4, characterized in that: The upper sliding gear and the lower sliding gear comprise an inner wall and an outer wall, wherein the inner wall is tightly connected to the rotating shaft, and the outer wall is connected to the slide rail of the resistance-type blade via a positioning sliding block.

6. A vertical axis wind turbine with a differential device according to claim 5, characterized in that: The inner wall and the outer wall of the upper sliding gear and the lower sliding gear are connected via balls.

7. A vertical axis wind turbine with a differential device according to claim 1 or 6, characterized in that: Four positioning slide blocks are arranged on the outer walls of the upper sliding gear and the lower sliding gear, and four upper slide rails and four lower slide rails are arranged on the resistance-type blades, and they are matched with the positioning slide blocks one by one.

8. A vertical axis wind turbine with a differential device according to claim 7, characterized in that: The upper part of the positioning bearing is connected to the upper positioning protrusion on the inner wall of the resistance type blade.

9. A vertical axis wind turbine with a differential device according to claim 8, characterized in that: The locating bearing is a ball bearing.

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