JPS63192968A - Blade control mechanism of windmill - Google Patents

Abstract

PURPOSE:To simplify a feedback mechanism and a control device for blade control and improve controlling accuracy by placing two hydraulic cylinders in series, making one of said cylinders control the variable range of the pitch of a blade while making the other control the stopping operation and the operation preparation range of a windmill. CONSTITUTION:At the time of operating a windmill, a blade angle control valve 6 and an electromagnetic selector valve 9 are operated so as to move hydraulic cylinders 1 and 2 rightward and oil is fed under pressure. A potentiometer (feedback mechanism) 10 which is installed on the blade angle controlling hydraulic cylinder 1 sends a signal indicating the moving quantity of the cylinder 1 to a control device, which, in turn, operates the blade angle control valve 6 so as to obtain an optionally set blade angle. The reciprocations of the cylinders 1 and 2 are transmitted to an arm 11 to rotate a blade 12. The emergency stop hydraulic cylinder 2 carries out on/off operations. And, an accumulator 8 as a driving hydraulic source is provided on the cylinder 2 to always accumulate pressure from a hydraulic tank 3 via a check valve 7. At the time of emergency, the cylinder 2 is operated by means of this exclusive driving hydraulic pressure source.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to blade ζ control of a variable pitch controlled wind turbine.

Conventional technology The blade control mechanism of the conventional variable pitch control wind turbine is 1.
Two hydraulic systems and one hydraulic cylinder were used to control the pitch of the wings.

In the case of variable pitch control type wind turbines, the variable range of the blades is 90 degrees, but the control device must have extra capacity to provide feedback over the entire range of 90 degrees when operating the wind turbine. There is. Further, in the case where there is only one hydraulic cylinder, if a problem occurs in the hydraulic system or the hydraulic cylinder, the blades cannot be controlled.

Problems to be Solved by the Invention An object of the present invention is to simplify the feedback mechanism and control device and improve control accuracy in blade control of a variable pitch control type wind turbine.

Means for Solving the Problems In order to achieve the above object, according to the present invention, two hydraulic cylinders are arranged in series, one of the hydraulic cylinders is assigned to control the variable pitch range of the blades during operation of the wind turbine, and A feedback mechanism and a control device are connected to the hydraulic cylinder. Since the variable range is narrow, the feedback mechanism and control device can be simplified, and even more precise control can be achieved. The other hydraulic cylinder performs on/off control and is responsible for stopping the wind turbine and controlling the operation preparation range. Since this hydraulic cylinder operates on-and-off, there is no need for a food pack mechanism or control device. The system can be simplified by designing the control to be shared in this way.

The blade control mechanism of the variable pitch control type wind turbine of the present invention includes an emergency stop hydraulic cylinder connected to the blade, a blade angle control hydraulic cylinder connected in series to the emergency stop hydraulic cylinder, and an operating position of the blade angle control hydraulic cylinder. a signal generating means for sending a signal representing the expression to the control device; a blade angle control valve connected to the blade angle control hydraulic cylinder and switching the direction of oil flow to the blade angle control hydraulic cylinder in response to a signal from the control device; An emergency stop control valve that is connected to the emergency stop hydraulic cylinder and switches the direction of supply of oil to the emergency stop hydraulic cylinder in response to a signal from a control device, an accumulator connected to the emergency stop control valve, and this accumulator. A hydraulic power source is provided which is connected to the blade angle control valve and supplies an oil flow at a constant pressure. In a preferred embodiment, the emergency stop valve is a spring offset type solenoid valve to ensure proper operation of the emergency stop hydraulic cylinder in the event of a power outage f.

Embodiment Referring to FIG. 1, a blade control mechanism of a variable pitch control type wind turbine, which is an embodiment of the present invention, will be described. In Fig. 1, l is a blade angle control hydraulic cylinder, 2 is an emergency stop hydraulic cylinder, 3 is an oil tank, 4 is an oil pump, 5 is a hydraulic pressure adjustment valve, 6 is a blade angle control valve, 7 is a check valve, 8 10 indicates an accumulator, 9 indicates an electromagnetic switching valve, 10 indicates a potentiometer, 11 indicates an arm, and 12 indicates a blade.

The oil in the oil tank 3 is pressurized by an oil pump 4, and adjusted to a specified oil pressure by an oil pressure regulating valve 5.

This pressure-regulated oil is sent to the blade angle control hydraulic cylinder 1 via a blade angle control valve 6 that operates in response to a signal from a control device (not shown).

Further, the pressure of the regulated oil passes through the check valve 7 and is accumulated in the accumulator 8. This accumulated oil is sent to the emergency stop hydraulic cylinder 2 via an electromagnetic switching valve 9 that operates in response to a signal from the control device.

When operating a windmill, move each hydraulic cylinder 1 to the right side of the diagram.
The blade angle control valve 6 and the electromagnetic switching valve 9 are operated so that the blade angle control valve 6 and the electromagnetic switching valve 9 are moved so that the oil is pumped.

A potentiometer (feedback mechanism) 10 attached to the blade angle control hydraulic cylinder 1 sends a signal representing the amount of movement of the hydraulic cylinder 1 to the control device to operate 6. The reciprocating motion of each hydraulic cylinder 1 and 2 is transmitted to the arm 11, causing the wing 12 to rotate.

The emergency stop hydraulic cylinder 2 performs on/off operations.

This hydraulic cylinder 2 is provided with an accumulator as a driving hydraulic pressure source, and pressure is constantly stored in an oil tank 3 via a check valve 7. In an emergency, it is operated using this exclusive drive hydraulic power source.

If a power outage occurs, the control device becomes inoperable, and the emergency stop hydraulic cylinder cannot be operated via the electromagnetic switching valve 9. To avoid this situation, a spring offset is used in the electromagnetic switching valve. In the event of a power outage, the hydraulic circuit is automatically switched, the oil stored in the accumulator 8 is added to the emergency stop hydraulic cylinder 2, the piston moves to the left in the figure, and the blade angle moves to the stop side of the wind turbine. Can be done. In this way, a fail-safe function can be provided.

Figure 2 shows the operating range of the wing.

rJ1%-:ffo-・(I;='1-・=--f:I
Jcps1;=-hi;j°11-1st 1-h-mountain-□,
a-j-l--1-1--30 degrees), and pitch control within this range is performed by the blade angle control hydraulic cylinder l.

Further, the range from ■ to ■ (θ, = 60°) is the operation preparation range, and the emergency stop hydraulic cylinder controls the pitch in this range by on/off operation.

Effects of the Invention As is clear from the above, by connecting two hydraulic cylinders in series, controlling the blade angle by individual movements, and dividing the hydraulic power source, it is possible to simplify the control device and control the blade angle. Improved control accuracy has been achieved.

In addition, the reliability of the blade angle drive operation was improved and a safety function (fail-safe) was provided.

Each hydraulic cylinder can be driven by an individual hydraulic source, so
Even if a problem occurs in the hydraulic cylinder or the hydraulic power source, the pitch of the blades can be changed to the stopping side of the wind turbine using one of the hydraulic cylinders and the hydraulic power source to safely stop the wind turbine.

4 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an embodiment of the invention. Figure 2 shows the operating range of the blade angle, and the notation is 3゜1..Blade angle control hydraulic cylinder, 2..Emergency stop hydraulic cylinder, 3..Oil tank, 4..Oil pump, 5..Hydraulic pressure. Adjustment valve, 6... Blade angle control valve, 7... Check valve, 8... Accumulator, 9...
Solenoid switching valve, 10... Potentiometer, 11... Arm, (1 other person)

Claims (1)

[Scope of Claims] An emergency stop hydraulic cylinder connected to a wing, a blade angle control hydraulic cylinder connected in series to the emergency stop hydraulic cylinder, and a signal that sends a signal representing the operating position of the blade angle control hydraulic cylinder to a control device. generating means, a blade angle control valve connected to the above-mentioned blade angle control hydraulic cylinder and switching the supply direction of oil flow to the blade angle control hydraulic cylinder in response to a signal from the control device; connected to the above emergency stop hydraulic cylinder; an emergency stop control valve that switches the direction of oil flow to the emergency stop control valve in response to a signal from a control device; an accumulator connected to the emergency stop control valve; and a connection between the accumulator and the blade angle control valve. A variable pitch control type wind turbine blade control mechanism characterized by being equipped with a hydraulic source that supplies an oil flow at a constant pressure.