JPS6056181A - Power transmission for windmill system - Google Patents

Abstract

PURPOSE:To control a windmill from below the tower by providing a current collecting system having a hollow shaft to be inserted with a vertical shaft for leading the power from the windmill installed on top of the tower to the lower portion of the tower. CONSTITUTION:A variable pitch section 9 incorporating electric machineries for varying the pitch of windmill blade 4 is provided then connect the power feed cables 10, 10' through a current collector 11 with a controller 12 installed at the lower section of tower 2. The rotary power of windmill blade 4 is transmitted through horizontal shaft 5, power shaft converter 6 and vertical shaft 7 to a generator 8 to drive it. Variation of pitch of windmill blade 4 can be operated from the lower section of tower by operating the variable pitch section 9 through a controller 12. Since the current collector 11 has hollow structure, the vertical shaft 7 can rotate at the center of turning of windmill 1 and never disturb the rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wind turbine in which a wind turbine is rotated by the force of the wind and the rotational energy is used as motive power.

Conventional configuration and its problems There is a wind turbine system that uses the rotational power of a wind turbine installed on a tower by guiding it to the bottom of the tower. One embodiment will be described based on FIG. 1.

FIG. 1 shows a power transmission mechanism of a conventional wind turbine system. In Fig. 1, 1 is a swing bearing 3 at the top of the tower 2.
This is a windmill that is attached so that it can rotate freely. 4 is a wind turbine; 6 is a horizontal shaft; 6 is a power shaft conversion device for transmitting the rotational power of the wind turbine 1 from the horizontal shaft 5 to the vertical shaft 7; and 8 is a generator as a load. Further, the part A surrounded by the dashed line, that is, the part including the horizontal shaft, power shaft conversion device, vertical shaft, swing bearing, etc., is called a power transmission device.

The operation of the wind turbine system configured as described above will be described below.

When the windmill implement 4 of the windmill 1 rotates in response to the wind, the rotational power is transmitted through the horizontal shaft 5, the power converter 6, and the vertical shaft 7 to drive a generator 8 provided under the tower to generate electricity.

However, in the above configuration, in the case of a wind turbine system in which electrical equipment such as an electric brake and a variable pitch motor is installed as a component of the wind turbine 1 and these are controlled from below, there is a risk of slippage due to the current collector in the rotating part. ring), it was necessary to effectively configure a power transmission mechanism such as a power shaft conversion device, vertical shaft, slewing bearing, current collector, and tower.

Purpose of the Invention The present invention has been made in view of the above-mentioned prior art, and provides a wind turbine system in which the rotational power of a wind turbine installed on a tower is guided to the bottom of the tower for use, and the wind turbine is (electrically) controlled from the bottom of the tower. The present invention provides a power transmission device for a wind turbine system configured to perform the following functions.

Structure of the Invention In order to achieve this object, the power transmission device for the wind turbine system of the present invention includes a wind turbine installed on a tower, a horizontal shaft that transmits the rotational power of the windmill, and a horizontal shaft that transfers the rotational power of the horizontal shaft from horizontal to vertical. a power shaft conversion device that converts the rotational power of the power shaft conversion device to the bottom of the tower, a vertical shaft that guides the rotational power of the power shaft conversion device to the bottom of the tower, and a current collector having a hollow shaft structure that allows the vertical shaft to pass through the center of the rotation center of the wind turbine. (slip ring).

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 2 and 3 show the configuration of a power transmission mechanism of a wind turbine system according to an embodiment of the present invention.

Note that the same members as in FIG. 1 are given the same numbers and their explanations are omitted.

In FIG. 2, reference numeral 9 denotes a variable pinch part incorporating an electric device for changing the pitch of the wind turbine 4, 10 and 10' denote a cable for applying current to the variable pitch part 40, and a current collector (
controller 1 under tower 2 through slip ring) 11
It is connected to 2.

FIG. 3 shows an enlarged view of part A of the power transmission mechanism of the present invention.

In the figure, the current collector 11 has a hollow shaft 13 in the center, and the hollow shaft is fixed to the body base 14 of the wind turbine. The current collector is electrically insulated and fixed to the outer periphery of the hollow shaft 13, and is in rotating contact with a conductive ring group 15 connected to the current-carrying cable 1°, and the ring group 15,
The operation of the power transmission device configured as above, which is composed of a group of conductive brushes 16 connected to a current-carrying cable 10' and fixed to the tower 2 by a rotation stopper 17, will be explained below. .

First, the rotational power of the wind turbine 4 drives the generator 8 via the horizontal shaft 6, the power shaft conversion device 6, and the vertical shaft. Next, as a device for changing the pitch of the wind turbine 4, an electrically operated variable pitch portion 9 is connected to the controller 1 through a current collector 11.
2, and variable pitch operation can be performed from the bottom of tower 2. The current collector 11 has a hollow structure in the center and is not in contact with the vertical shaft 7 that rotates at the center of rotation of the wind turbine 1, so that it does not interfere with the rotation of the power shaft.

As described above, according to this embodiment, a current collector having a hollow shaft structure is attached to the center of rotation of the wind turbine, and the power transmission device is configured such that the vertical shaft passes through the inside of the hollow shaft. The rotational power of the windmill installed on the tower can be guided to the bottom of the tower and used, and the windmill can be (electrically) controlled from below the tower.

Effects of the Invention As described above, the present invention provides a wind turbine installed on a tower, a horizontal shaft that transmits the rotational power of the windmill, a power shaft conversion device that converts the rotational power of the horizontal shaft from horizontal to vertical, and It is equipped with a vertical shaft that guides the rotational power of the power shaft conversion device to the bottom of the tower, and a current collector that has a hollow shaft that allows the vertical shaft to pass through the center.The rotational power of the wind turbine is guided to the bottom of the tower and used. At the same time, the windmill can be easily controlled (electrically) from below the tower, which has significant practical effects.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the power transmission device of a conventional wind turbine system.
2 and 3 are cross-sectional views of a power transmission device of a wind turbine system according to an embodiment of the present invention.・
・Horizontal axis, 6...Power shaft conversion device, 7...
... Vertical shaft, 11 ... Current collector (slip ring), 13 ... Hollow shaft. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2

Claims (1)

[Claims] A windmill installed on the tower, a horizontal shaft that transmits the power of this windmill, a power shaft conversion device that converts the rotational power of this horizontal shaft from horizontal to vertical, and a vertical shaft that guides the rotational power of this device to the bottom of the tower. , and a current collector having a hollow shaft through which the vertical shaft passes.