JP4370477B2 - Sail-wheel wind turbine (Sail-WheelWindTurbine) - Google Patents

Description

The present invention relates to a method for configuring a wind turbine in a wind turbine generator.

Background art and problems to be solved by the invention

Conventional wind turbines have blades attached radially from the rotating shaft. It drives the generator by transmitting rotational energy from wind power to the rotating shaft by means of blades. In that case, the blades are involved in the force that tends to break in the direction of the wind and the rotational force transmitted from the blades to the rotating shaft. Each force is a bending force, and to withstand it, a stronger material and a larger sectional area on the structure are required. In particular, in the former case, it is necessary to design with a certain safety factor based on the numerical value obtained by investigating the natural environment of the place where it is installed to prevent destruction from strong winds. Further, turning the blade wind receiving surface as shown in FIG. 2 is effective as a measure against strong winds. However, there are occasional reports that the windmills that have been installed have been broken, as the wind has far exceeded these assumptions.

In order to avoid destruction from strong winds, the strength of the blades is an important issue in designing wind power generators. In order to demand more safety, the designed blades have a large weight.

When a turbine equipped with such heavy blades rotates, a force that maintains the orientation of the rotating shaft, that is, a gyro effect occurs, and a phenomenon occurs in which the change of the rotating surface is hindered. In particular, the larger the number of blades, the stronger the effect. In using wind energy, it is preferred to follow the wind from the front of the turbine as much as possible from the front. However, the conventional technology inevitably has such an impossibility.

Means for solving the problem

The present invention is based on the lightest possible construction method and the idea of giving sufficient strength to support the blades of the turbine. Various methods have been devised, and finally hints have been obtained from the structure of the bicycle wheel. It was made. Bicycle wheels have a very simple construction and are manufactured to withstand heavy weight and various driving conditions. Especially when it comes to competitive bicycles, it has been recognized as reliable in strength despite its weight reduction. Many bicycles for daily use are 26 and 28 inches, and the number of spokes is 36. The four spokes work as a set to restrain the rim (Rim, the frame of the foil) and the hub (Hub, the bearing support). The four spokes in each group are two on the left and right, intersecting in the front-rear direction in the running direction, and having a certain angle with the radial direction. With such a configuration, not only the rim is kept circular, but also the positional relationship between the rim and the hub (that does not shift in the rotational direction) is completely restrained.

As shown in FIG. 3 , the left LB and the right RB in a pair of spokes have a fixed angular relationship in space, and various positions are connected by lines so as to cross between these spokes. And it can be seen that each connecting line is a curved surface. In the same way, curved surfaces with the same tendency can be formed in the spokes of LA and RA. These curved surfaces are like twisted ribbons, and when they hit the wind, a force is generated to turn the spokes clockwise.

The frame of the turbine corresponding to the rim of the bicycle wheel should be as light and strong as possible. An aluminum alloy pipe processed into an annular shape is ideal. Further, it is preferable that the wire corresponding to the spoke has a small expansion coefficient as the temperature changes. In order to adjust the tension of the wire, use a joint dedicated for adjustment, and make it a structure that can be locked. Use a thin cloth (sail) as a blade, and attach it to two wires. Since there is a crossing position of the wire, one side (bottom side) of the sail is fixed at this crossing position. With such a fixing method, the sail can be expanded and contracted along the wire. The wind receiving area of the blades can be adjusted by attaching pulleys and wires so that the top of each sail can be stretched to the frame.

The sail lifting mechanism described here is only necessary for large scale devices. If the material of the sail is weak, the sail itself will be sacrificed and torn when subjected to strong winds, thereby avoiding the destruction of the entire device and maintaining maintainability. If the broken sail is replaced after the strong wind leaves, the function of the device can be easily restored. By making a simple device, more people can easily use wind energy.

The force applied to the turbine is a force that stretches the wire and a force that pulls the frame back in the center direction. The force pulling back in the direction of the center of the circle is finally converted into a compressive force by the structure of the circle, and is a force that is easily tolerated by the solid material. In addition, the stretching force applied to the wire is a so-called tension, and the metal material has an ability to withstand orders of magnitude more than the bending force. In other words, even very thin materials can maintain turbine stability. Compared to the conventional structure with long blades of a windmill, this sail / ring structure is light and strong.

Since the weight of the turbine is much lighter than that of the conventional turbine, even if a large number of blades are mounted, the weight is only slightly increased and the rotational moment of inertia is small. With this device, it is possible to use weak wind energy by using more blades. With a turbine of the same size, a driving force several times that of the conventional one can be obtained, so that more output can be obtained. If a device with the same output is installed, it can be realized with a size less than half that of a conventional turbine. There are advantages in terms of installation location and device manufacturing costs.

Turbine configuration 1 Turbine frame (ring) 2 Wire 3 Blade (sail) 4 Rotating shaft Conventional blade adjustment of wind receiving surface Spoke Spatial Relation LA Left Spoke A LB Left Spoke B RA Right Spoke A RB Right Spoke B

Claims (2)

An annular frame is arranged around the hub fixed to the shaft portion of the wind turbine, and the wires are alternately left and right from the circumferentially equidistant position of the inner peripheral surface of the annular frame toward both ends of the hub. In addition, the frame structure of the wind turbine is configured by pulling and fixing the pair of left and right wires in front and back alternately in the axial vertical direction of the hub, and using the three-dimensional relationship between the wires in the structure, The blades of the wind turbine are constructed by extending a sail between the wire fixed to one end of the hub and the wire fixed to the other end of the hub, that is, between the pair of left and right wires. Of the turbine by the restraining force (pulling force) generated only in the extending direction of the turbine and the reaction force against the restraining force generated in the arch structure formed by the annular frame itself. Wind turbine, characterized in that to keep the sex. The wind turbine according to claim 1, wherein the wind turbine adapts to the strength of wind by raising and lowering the sail performed along the wire, that is, expansion and contraction of the blades.

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