JP2013256958A - Downwind power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that there have been necessity for starting a small downwind windmill, canceling a vortex at the back of a support tower, canceling a braking effect in upper and lower parts of a rotor caused by deviation between the wind direction and a rotor shaft, and preventing airfoil breakage in these portions.SOLUTION: A downwind power generator Y includes a power generator 12 that is coupled to an airfoil 13 through a rotor shaft 9 and rotates in conjunction with the rotation of the airfoil 13, coupling bearings 3 disposed in upper and lower parts of the power generator 12, and upper and lower fixed bearings 1 that are mounted on a rope and coupled to the upper and lower coupling bearings 3 through a support rotary shaft 2, respectively.

Description

  The present invention is a wind turbine having a downwind rotor blade driven by wind, which prevents damage to the rotor blades by wind guidance and rectification when the wind direction fluctuates, avoids interference between the rotor and the nearby support structure, and operates by wind collecting effect It relates to a wind power generator that improves efficiency and startability.

In general, yawing of a small downwind wind turbine with a rear rotor is performed only by a coning blade because there is no tail fin in the mechanism. However, small high-performance wind turbines with high solidity blades are thin and have low drag, making it difficult to yaw at low wind speeds and high startup wind speeds.
Therefore, a technology with a low startup wind speed has been put into practical use.

JP 2007-23813 A Utility model registration number 3063480

  The purpose is to start up a small downwind wind turbine, eliminate the vortex behind the support tower, eliminate the braking effect of the blades located at the top and bottom of the rotor due to the deviation of the wind direction and the rotor shaft, and prevent damage to the blades in this part.

  The downwind generator of the present invention is connected to a wing and a rotor shaft, and rotates in conjunction with the rotation of the wing, connected bearings provided at the upper and lower portions of the generator, and attached to a rope, The upper and lower connecting bearings and upper and lower fixed bearings respectively connected by a support rotating shaft are included.

  The present invention uses a taper duct to prevent drag from being generated by forced alignment of the wind direction to the rotor upper and lower wings due to wind guidance and rectification effects when yaw cannot be handled due to suddenly changing wind directions, and burdens on the wings due to braking, etc. This reduces the risk of smooth operation and improves efficiency and safety.

  By opening the inner opening valve of the taper duct with the wind pressure due to the sudden change in the wind direction, it is possible to compensate for the decrease in the air inflow amount at the front part of the duct.

  The taper duct structure enables yawing at a low wind speed by avoiding interference with the upper and lower structures of the rotor and the fin effect of the side plate, and can enhance the startability by the wind increasing effect of the tapered portion. In addition, because of the thin plate structure, it is possible to avoid the influence on the rotor blades of the support wake that is peculiar to downwind wind turbines.

The perspective view of the downwind generator concerning the embodiment of the present invention is shown. The side view of the downwind generator concerning the embodiment of the present invention is shown. The front view of the downwind generator concerning the embodiment of the present invention is shown.

  The duct 15 has a fin effect, and a wind increasing effect is generated by the upper and lower tapered structures. Therefore, the starting wind speed is greatly reduced, and the amount of energy gained is increased by about 15%. Safety can be increased.

  The duct 15 reduces the starting wind speed from the conventional 4 to 5 m / s to 2.5 to 3 m / s, facilitates starting at a low wind speed where the wind speed appears frequently, and can improve the wind turbine efficiency by 15%, and the safety of the blades. The property can be increased by about 50%.

  The following describes embodiments of the downwind generator of the present invention in detail with reference to the drawings.

  FIG. 1 shows a perspective view of a downwind generator Y according to an embodiment of the present invention. FIG. 2 shows a side view of the downwind generator Y according to the embodiment of the present invention. FIG. 3 shows a front view of the downwind generator Y according to the embodiment of the present invention.

  1, 2, and 3, a rectangular steel duct 15 made of a thin steel plate is formed as a tapered duct 4 having front and rear sides as open surfaces, left and right sides as closed side surfaces, and upper and lower sides as angles.

  In the duct 15, the blade 13 and the generator 12 are connected to the front and rear open surfaces by the rotor shaft 9, and the generator 12 is rotated in conjunction with the rotation of the blade 13.

  Two to six blades 13 are mounted on a blade fixing disk 10 attached to a rotor shaft 9, and the blade fixing disk 10 and the rotor shaft 9 are fixed by a rotor bearing 11.

  The rotor shaft 9 in contact with the duct 15 is protected by the yaw frame 7, and the yaw frame 7 and the duct 15 are fastened with several fixing bolts 14 at the center.

  The upper and lower portions of the left and right closed sides of the duct 15 are opened, and the inner opening valve 6 is attached to the opening. Reduction is prevented, the proper wind direction to the blades 13 at the rotor vertical position is maintained, and the generator 12 side faces the wind direction.

  The upper and lower sides of the duct 15 are tapered tapers 4 having an angle. The tapered duct 4 has a large area on the front generator 12 side, a small area on the rear wing 13 side, and an inflow air from the front generator 12 side. The pressure of the air is increased to increase the wind speed of the wind, and the air is blown out to the rear wing 13 side.

  The open surface of the duct 15 on the side of the coning wing 13 corresponds to a coning rotor whose center is constricted to an M shape.

  The vertical taper duct 4 of the duct 15 prevents the yaw from being handled due to a suddenly changing wind direction, so that a drag force is not generated on the rotor upper and lower blades due to the wind guide and rectification effect, and the load on the blade due to braking or the like is not generated. Reduces smooth operation and improves efficiency and safety.

  Connecting bearings 3 are provided at the upper and lower portions of the taper duct 4, the supporting rotating shaft 2 is connected between the connecting bearing 3 and the fixed bearing 1, and the supporting rotating shaft 2 is interlocked with the wind direction of the inner opening valve 6. Rotate. By opening the inner opening of the taper duct with the wind pressure caused by the sudden change in the wind direction, it is possible to compensate for a decrease in the amount of air inflow at the front of the duct, so that the wind with increased wind pressure facilitates the rotation of the blades 13 and the inside of the duct 15 The four inner open valves 6 always take the best wind into the duct 15 by directing it in the wind blowing direction.

  The upper and lower fixed bearings 1 of the duct 15 are fixed to a fixed support, but may be connected to a floating rope or the like.

  The inner opening valve 6 is attached to the two hinge hinges 5 at the upper and lower ends, and corresponds to the wind direction deviation, and the hinge hinge 5 is opened and closed by wind pressure.

  The present invention relates to an improvement in wind power generation because it can be installed anywhere with a small size and at a low cost by a mechanism capable of rotating a blade with a small amount of air among the most frequently used wind power generators in the field of natural energy.

DESCRIPTION OF SYMBOLS 1 Fixed bearing 2 Supporting rotating shaft 3 Connection bearing 4 Tapered duct 5 Hinge hinge 6 Inner valve 7 Yaw frame 8 Fastening bolt 9 Rotor shaft 10 Blade fixed disk 11 Rotor bearing 12 Generator 13 Blade 14 Fixed bolt 15 Duct Y Downwind power generation Machine

Claims (2)

A generator connected to the wing and the rotor shaft and rotating in conjunction with the rotation of the wing;
Connecting bearings provided at the upper and lower portions of the generator;
A downwind generator connected to a rope and including the upper and lower connecting bearings and upper and lower fixed bearings respectively connected by a support rotating shaft.   The downwind generator according to claim 1, wherein the wing is a Corning wing.

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