Self-adaptive adjusting mechanism for blade rotation radius of vertical axis wind turbine

Abstract

The invention discloses a vertical axis wind turbine blade rotation radius self-adaptive adjusting mechanism and belongs to wind turbine equipment. A groove type sliding rail is fixedly installed on a fan shaft, two guide rods are vertically and fixedly installed in a groove cavity of the groove type sliding rail in parallel, a sliding block can be clamped on the groove type sliding rail in an up-down moving mode, a pressure spring is arranged on the guide rods in a sleeved mode, the two ends of a supporting and pushing rod are hinged to the sliding block and a rod base on a lower supporting rod respectively, and a threaded hole base plate is fixedly installed at the lower end of the groove type sliding rail. The threaded rod is rotatably and vertically movably arranged in a threaded hole in the threaded hole seat plate, and the upper end of the threaded rod is in contact supporting positioning fit with the lower end face of the sliding block; the mechanism is novel, unique, simple and reasonable in structure, low in manufacturing cost, high in wind speed self-adaptive capacity, high in automation degree, easy, convenient and rapid to adjust and operate, reliable to use and good in safety.

Description

Technical Field

[0001] The invention belongs to wind turbine equipment and mainly relates to a self-adaptive adjustment mechanism for the rotation radius of blades of a vertical-axis wind turbine. Background Art

[0002] Vertical axis wind turbines are widely favored because of their many technical features, such as their power generation device and control system are located on the ground, which is convenient to use, can receive wind energy from all directions, have a simple structure, and good stability. However, in the practice of power generation, it is found that due to the randomness of natural wind force, the vertical axis wind turbines with existing structures will have technical problems such as difficulty in starting or unstable power generation performance, that is, when the natural wind speed is too small, the wind force is not enough to drive the blades to rotate, and it is difficult to start; when the natural wind speed is too large, the blades are prone to tearing. Therefore, how to adjust the output torque of the vertical axis wind turbine rotating device according to the size of the ambient wind speed has become the current research focus. In order to solve the above problems, there are currently two technical solutions: using a telescopic mechanism to actively change the distance from the blade to the shaft and using the telescopic blade to adaptively change the windward area to improve the utilization rate of wind energy. However, there are many problems that need to be solved, such as complex structure, high manufacturing cost, poor adjustment effect, and low operating efficiency. Summary of the invention

[0003] The purpose of the present invention is to address the problems existing in the above-mentioned prior art, and in combination with the actual needs for the use of vertical axis wind turbines in current wind power generation, to develop and design an adaptive adjustment mechanism for the rotation radius of the blades of a vertical axis wind turbine, so as to achieve the goals of simple and compact structure, low manufacturing cost, strong adaptability to wind speed, high degree of automatic adjustment and operating efficiency, few operating failures, and simple and convenient control operation.

[0004] The object of the invention is achieved in this way: a groove slide rail is fixedly installed on the fan shaft, at a position below the lower ear plate of the shaft, and two guide rods are fixedly installed in the groove cavity of the groove slide rail in vertical directions and parallel to each other, and a sliding block is clamped on the groove slide rail and can be reciprocated up and down. The lower side parts of the two guide rods can be inserted and fitted on the sliding block for relative up and down movement, and two pressure springs are respectively sleeved on the outside of the two guide rods, and the upper end faces and lower end faces of the pressure springs are respectively extruded and contacted with the inner wall surface of the upper end of the groove slide rail and the upper end face of the sliding block, and the rod seat is fixedly installed on the lower support rod, and the two ends of the support push rod are respectively hinged with the sliding block and the rod seat, and a threaded hole seat plate is fixedly installed on the lower end part of the groove slide rail, and the threaded rod can be rotatably and movably installed in the threaded hole on the threaded hole seat plate up and down, and the upper end of the threaded rod is in supporting contact and positioning cooperation with the lower end face of the sliding block, thereby forming a vertical axis wind turbine blade rotation radius adaptive adjustment mechanism.

[0005] The invention has novel, unique, simple and reasonable structure, low cost, strong wind speed self-adaptation ability, high degree of automation, simple, convenient and fast adjustment operation, reliable use, high operating efficiency and good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall structure of a self-adaptive adjustment mechanism for the rotation radius of a vertical axis wind turbine blade;

[0007] Figure 2 yes Figure 1 AA section view;

[0008] Figure 3 yes Figure 1 Left-facing view of

[0009] Figure 4 yes Figure 3 A magnified view of part B;

[0010] Figure 5 yes Figure 1 A top view of

[0011] Figure 6 yes Figure 5 Enlarged view of part C.

[0012] Description of part numbers in the figure:

[0013] 1. Body, 2. Fan shaft, 3. Threaded rod, 4. Threaded hole seat plate, 5. Grooved slide rail, 6. Slider, 7. Push rod, 8. Lower support rod, 9. Blade, 10. Upper ear plate of machine shaft, 11. Lower ear plate of machine shaft, 12. Upper support rod, 13. Upper ear plate of blade, 14. Lower ear plate of blade, 15. Rod seat, 16. Pressure spring, 17. Guide rod. DETAILED DESCRIPTION

[0014] The following is a detailed description of the implementation scheme of the invention in conjunction with the accompanying drawings. A vertical axis wind turbine blade rotation radius adaptive adjustment mechanism, a fan shaft 2 is rotatably inserted and installed vertically on a fuselage 1, an upper shaft ear plate 10 and a lower shaft ear plate 11 are fixedly installed on the upper outer side of the fan shaft 2 from top to bottom, and an upper blade ear plate 13 and a lower blade ear plate 14 are fixedly installed on the inner wall surface of the blade 9 from top to bottom, and the inner and outer ends of the upper support rod 12 and the lower support rod 8 arranged in parallel to each other are hingedly connected to the upper shaft ear plate 10 and the upper blade ear plate 13 and the lower shaft ear plate 11 and the lower blade ear plate 14, respectively, so that the blade 9 is installed on the fan shaft 2 as a whole, and a grooved slide rail 5 is fixedly installed on the fan shaft 2 at a position below the lower shaft ear plate 11, and vertically parallel fixed grooves are fixedly installed in the groove cavity of the grooved slide rail 5. Two guide rods 17 are installed, and the slider 6 can be clamped on the groove slide rail 5 so as to be reciprocatingly movable up and down. The lower side parts of the two guide rods 17 can be inserted into the slider 6 so as to be relatively movable up and down. Two pressure springs 16 are respectively sleeved on the outside of the two guide rods 17. The upper end surface and the lower end surface of the pressure spring 16 are respectively in extrusion contact with the inner wall surface of the upper end of the groove slide rail 5 and the upper end surface of the slider 6. A rod seat 15 is fixedly installed on the lower support rod 8, and the two ends of the support push rod 7 are respectively hinged to the slider 6 and the rod seat 15. A threaded hole seat plate 4 is fixedly installed on the lower end part of the groove slide rail 5. The threaded rod 3 is rotatably and movably installed in the threaded hole on the threaded hole seat plate 4. The upper end of the threaded rod 3 is in supporting contact and positioning cooperation with the lower end surface of the slider 6.

[0015] Before starting the vertical axis wind turbine, first determine the minimum rotation speed of the fan shaft 2 according to the wind speed data, and then rotate the threaded rod 3 on the threaded hole seat plate 4. The threaded rod 3 moves upward or downward under the control and drive of the threaded hole on the threaded hole seat plate 4, and pushes the slider 6 to move upward or downward. The upward or downward movement of the slider 6 causes the lower support rod 8 to rotate upward or downward around the lower ear plate 11 of the machine shaft fixed on the fan shaft 2 through the support push rod 7 and the rod seat 15. With the cooperation of the upper support rod 12, the rotation radius of the blade 9 is increased or reduced, ensuring the smooth start-up of the vertical axis wind turbine at the lowest wind speed.

[0016] After the vertical axis wind turbine is running stably, (i) when the wind speed increases, the centrifugal force of the blade 9 rotation increases, driving the parallel four-bar mechanism composed of the upper support rod 12 and the lower support rod 8 to rotate upward, and the slider 6 is pulled upward on the grooved slide rail 5 by the support push rod 7, and the pressure spring 16 is compressed. At this time, the rotation radius of the blade 9 increases, and the moment of inertia increases. From the law of conservation of angular momentum, it can be seen that when the moment of inertia increases, the rotation speed decreases, thereby reducing the risk of tearing of the blade 9; (ii) when the wind speed decreases, under the push of the restoring force of the pressure spring 16, the slider 6 moves downward, and the lower support rod 8 is pulled downward by the support push rod 7 and the rod seat 15 to rotate, thereby reducing the rotation radius of the blade 9 and reducing the moment of inertia. According to the law of conservation of angular momentum, when the moment of inertia decreases, the rotation speed of the blade 9 increases, ensuring that the vertical axis wind turbine can adaptively obtain a reasonable operating rotation speed.

Claims

1. A self-adaptive adjustment mechanism for the rotation radius of blades of a vertical axis wind turbine, wherein a fan shaft (2) is rotatably inserted and installed in a vertical direction on a fuselage (1), an upper shaft ear plate (10) and a lower shaft ear plate (11) are fixedly installed on the upper outer side of the fan shaft (2) from top to bottom in sequence, and an upper blade ear plate (13) and a lower blade ear plate (14) are fixedly installed on the inner wall surface of a blade (9) from top to bottom in sequence, and the inner and outer ends of an upper support rod (12) and a lower support rod (8) arranged parallel to each other are respectively hingedly connected to the upper shaft ear plate (10) and the upper blade ear plate (13) and the lower shaft ear plate (11) and the lower blade ear plate (14), so that the blade (9) is installed on the fan shaft (2) as a whole, characterized in that: A grooved slide rail (5) is fixedly mounted on the fan shaft (2) at a position below the lower ear plate (11) of the shaft. Two guide rods (17) are fixedly mounted vertically and parallel to each other in the groove cavity of the grooved slide rail (5). A slider (6) is clamped on the grooved slide rail (5) so as to be reciprocatingly movable up and down. The lower sides of the two guide rods (17) are inserted into the slider (6) so as to be relatively movable up and down. Two pressure springs (16) are respectively mounted on the outside of the two guide rods (17). The upper end surface and the lower end surface of the pressure spring (16) are The surfaces are respectively in extrusion contact with the inner wall surface of the upper end of the groove type slide rail (5) and the upper end surface of the slider (6); a rod seat (15) is fixedly mounted on the lower support rod (8); the two ends of the support push rod (7) are respectively hingedly connected with the slider (6) and the rod seat (15); a threaded hole seat plate (4) is fixedly mounted on the lower end of the groove type slide rail (5); the threaded rod (3) is rotatably and vertically movable in the threaded hole on the threaded hole seat plate (4); the upper end of the threaded rod (3) is in supporting contact and positioning cooperation with the lower end surface of the slider (6).

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