A vertical axis wind turbine composite vibration power generation system

Abstract

The application discloses a vertical axis wind turbine composite vibration power generation system, which comprises a wind turbine blade, a long shaft, a long shaft bearing, a variable characteristic length bluff body, a universal joint, a speed increaser, a power generation host and a spring cable reciprocating motion power generation module; the power generation host is placed on the ground and is provided with a speed increasing device; the blade is directly installed on the long shaft; because the traditional vertical axis wind turbine has severe vibration during operation, fixed installation easily leads to fatigue of a support frame; the long shaft drives the speed increaser to rotate through the universal joint, so that the material fatigue problem can be effectively solved; the variable characteristic length bluff body is two butted umbrella-shaped shells; the external shape can be changed by being lengthened and tightened, and the vortex-induced oscillation frequency can be changed; the purpose is to form resonance with the vibration of the wind turbine blade to obtain more vibration energy; in the spring cable reciprocating motion power generation module, the spring cable pulls the long shaft bearing at one end and drives two opposite installed generators at the other end; one-way bearings are respectively arranged on the shafts of the two generators; the two generators work alternately in the reciprocating motion; this mode can not only buffer the severe oscillation generated during the operation of the system, but also obtain electric energy through vibration, so that the power generation efficiency of the whole system is improved.

Description

Technical Field

[0001] This application relates to the field of wind power generation, and in particular to a vertical axis wind turbine composite vibration power generation system. Background Technology

[0002] Currently, the commercial development of vertical axis wind turbines remains slow, mainly due to two reasons: First, while straight airfoils are cheaper, their wind energy utilization coefficient is also lower, with megawatt-class turbines lagging behind comparable horizontal axis turbines by approximately 0.1. Second, they experience severe oscillations during operation. While wind turbines, as bluff bodies, exhibit vortex-induced oscillations in wind fields, vertical axis turbines also experience oscillations caused by the periodic changes in wind pressure on the rotating blades. The coupling of these two types of oscillations easily leads to fatigue failure of the support columns. Many accidents in the 1980s were related to severe oscillations, and the current solution mainly involves reinforcement. Historical experience and lessons show that controlling oscillations is the primary issue for achieving breakthroughs in the capacity of large vertical axis wind turbines. Summary of the Invention

[0003] The primary technical problem this invention aims to solve is to provide a vertical axis wind turbine composite vibration power generation system. Besides generating electricity through blade rotation along the long axis, this system can also generate electricity using the vibrations generated during the operation of the vertical axis wind turbine. Compared to traditional vertical axis wind turbines, this composite system improves the wind energy utilization coefficient, providing an optimized solution for simultaneously addressing the low wind energy utilization coefficient and severe oscillation problems of large-scale vertical axis wind turbines. The second technical problem this invention solves is to provide a method for achieving resonance between blade oscillation and system vortex-induced oscillation. The third technical problem this invention solves is to provide a method for achieving reciprocating power generation using spring cables. To solve the above technical problems, the technical solution of this invention is: a vertical axis wind turbine composite vibration power generation system, comprising a vertical axis wind turbine power generation module and a spring cable reciprocating motion power generation module. The vertical axis wind turbine power generation module includes blades, a long axis, a speed increaser, and a generator. The spring cable reciprocating motion power generation module consists of the cable and the reciprocating generator. The cable connects the long axis bearing to the reciprocating generator, and the reciprocating generator is arranged in a circular array around the long axis on the horizontal plane of the generator. As an improvement, the long shaft is connected to the variable characteristic length blunt body and the universal joint, and the long shaft bearing is mounted on the long shaft. As another improvement, the reciprocating motion power generation module contains the same small generator set. To solve the second problem mentioned above: the solution adopted by this invention is a vertical axis wind turbine composite vibration power generation system, supported by the cable, the universal joint, and the variable characteristic length blunt body. Under different incoming wind speeds, the detachment frequency of the fluid vortex is changed to achieve a frequency close to the vibration frequency of the long shaft, causing resonance. To solve the third problem: the solution adopted by this invention is a vertical axis wind turbine composite vibration power generation system, in which the small generator set is connected to the vertical axis wind turbine power generation device via the cable. A one-way bearing is installed on each of the two generator shafts of the small generator set. The cable reciprocates, and the two power generation modules generate electricity alternately. The technical effects achieved by adopting the above technical solution are as follows: Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention realizes the recovery of vibration energy generated during the movement of a vertical axis wind turbine, thereby solving the problems of low wind energy utilization coefficient and severe oscillation in large-scale vertical axis wind turbines. 2. Based on the long axis of the vertical axis wind turbine, the present invention adds a universal joint and a variable characteristic length blunt body, which changes the detachment frequency of the fluid vortex under different incoming wind speeds, achieving a frequency close to the oscillation frequency of the long axis, inducing resonance, and improving the vibration energy density. 3. In the spring cable reciprocating motion power generation module described in the present invention, unidirectional bearings are innovatively used on the two generator shafts respectively, realizing alternating power generation of the two generators in one direction, reducing energy loss during the commutation process. Attached Figure Description

[0004] Figure 1This is a schematic diagram of the structure of a vertical axis wind turbine combined vibration power generation system according to the present invention.

[0005] Figure 2 for Figure 1 Schematic diagram of the spring cable reciprocating motion power generation module

[0006] Explanation of the labels in the diagram: 1-Wind turbine blade, 2-Long shaft, 3-Long shaft bearing, 4-Variable characteristic length blunt body, 5-Universal joint, 6-Spring-cable reciprocating motion power generation module, 61-Cable, 62-Reciprocating power generation device, 63-Spring, 7-Speed ​​increaser, 8-Generating unit Detailed Implementation

[0007] The technical solutions adopted by the present invention will be described in detail and completely below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention. An invention of a wind turbine power generation device includes a dual-bladed vertical axis wind turbine, as shown in the figure, 1 wind turbine blades, 2 long shaft, 3 long shaft bearing, 4 variable characteristic length blunt body, 5 universal joint, 6 spring cable and its reciprocating motion driven power generation module, 7 speed increaser, 8 generator main unit. The feature is that there is a long shaft 2 at the rotation center of the vertical axis wind turbine, and a universal joint 5 below the long shaft 2 is connected to the speed increaser 7. Above the variable-length blunt body 4 is a long-shaft bearing 3, with four spring cables connected to four generators below. These generators are fixed to the four ends of a cross-shaped base. Each generator shaft has a one-way bearing, and each generator constitutes a power generation module. Together with the vertical-axis wind turbine above, they form five power generation modules. In the center of the base is a main generator 8, connected to a speed increaser 7. The main generator 8 is fixed to the base and enables the combined power generation of the five modules. Driven by wind, the vertical-axis wind turbine rotates, driving the long shaft 2. This speed increaser 7, via a universal joint 5, drives the main generator 8 to generate electricity. In addition to rotating around the long shaft, the wind turbine blades also oscillate violently, causing the long shaft 2 to swing. The variable-length blunt body 4, covering the long shaft, consists of two mating umbrella-shaped shells. Stretching and tightening these shells alters the external shape, changing the detachment frequency of the fluid vortex under different incoming wind speeds, achieving a frequency close to the oscillation frequency of the long shaft, thus inducing resonance and increasing the energy density of the vibration. As the long shaft 2 swings away from its original position, it pulls the spring. The stretched spring, through the bearing 3, performs a reciprocating motion, converting the energy of the vibration into the elastic potential energy of the spring. The reciprocating motion of the spring cable drives the power generation module 62 to generate electricity alternately. The system thus achieves combined rotation and vibration power generation. The number of wind turbine blades 1 in the vertical axis wind turbine can be selected according to the actual situation, and the installation position is at the top of the long shaft 2. The generator in the spring cable reciprocating motion power generation module 6 can be independently selected from different types of generators. In the specific content of the above specific embodiments, the technical features can be combined arbitrarily without contradiction. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here.Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention shall be included within the scope of protection claimed by this invention.

Claims

1. A vertical axis wind turbine combined vibration power generation system, characterized in that: This system employs a power generation mode combining vertical-axis wind power generation with a spring-cable reciprocating motion power generation module. The vertical-axis wind power generation includes wind turbine blades, a long shaft, a long shaft bearing, a variable-length blunt body, a universal joint, a speed increaser, and a generator. The wind turbine blades are directly mounted on the long shaft, which drives the speed increaser to rotate via the universal joint. The generator is located at the center of the power generation system base, and the speed increaser is located above the generator. The spring-cable reciprocating motion power generation module includes a cable, a small generator, and a spring. Three or more of these modules are connected to the long shaft bearing, driving the reciprocating motion... The power generation module is located on the periphery of the power generation system base. The variable characteristic length blunt body is attached to the middle of the long shaft. The variable characteristic length blunt body consists of two mating umbrella-shaped shells. It can be stretched and tightened to change its external shape and achieve vortex-induced oscillation at a variable frequency. There are two small generators in the power generation module that are installed opposite each other. Each generator shaft is equipped with a one-way bearing. When the cable reciprocates, the two generators generate electricity alternately. One end of the universal joint is connected to the long shaft and the other end is connected to the speed increaser, so that the wind turbine blades spin to drive the generator host, and at the same time, the wind turbine blades and the long shaft sway with the wind without restriction.

2. The vertical axis wind turbine composite vibration power generation system according to claim 1, characterized in that: The generator is located on the base of the power generation system and is driven by a long shaft through a universal joint, which lowers the center of gravity of the vertical axis wind turbine and increases stability.

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