JPH11280637A - Generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform manufacturing and installation at low costs so as to decrease the cost by directly connecting a low-speed high-capacity pump for pumping to a windmill and driving a generator without using a speed increasing device to a high-torque low-speed input rotation from the windmill. SOLUTION: A generator for generating power by rotating the windmill using wind energy is provided with a radial pump 4A directly connected to a shaft 2 of a windmill 1, a variable capacity hydraulic motor 6A connected to high and low voltage pipe passages 5a, 5b constituting a closed circuit together with the radial pump 4A, a generator MG directly connected to the variable capacity hydraulic motor 6A, a charge pump and a relief valve connected to the low voltage pipe passage 5b via a check valve 7, and an electric motor M for driving the charge pump 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator for generating electric power by using wind energy, and more particularly to an improvement of a drive device for driving a generator by converting wind energy into hydraulic pressure.

[0002]

2. Description of the Related Art Conventionally, as a power generator for converting electricity of this kind of wind or hydraulic energy into hydraulic pressure to generate electricity, as shown in FIG. 6, a wind turbine 1 or a water turbine which receives wind energy or hydraulic energy includes: A variable displacement hydraulic pump 4 is directly connected to an output shaft 3a of the speed increaser 3 via a main shaft 2, and a constant displacement is connected to the variable displacement pump 4 via pipes 5a and 5b. The hydraulic motor 6 is connected in a closed circuit, and a generator MG is connected to a shaft 6 a of the constant displacement hydraulic motor 6. When the windmill or waterwheel rotates due to wind power or hydraulic power, the rotational power is
When the variable speed pump 4 is driven by being transmitted to the speed increaser 3 via the speed increaser and the variable speed pump 4 is driven, the variable speed hydraulic pump 4
The constant-displacement hydraulic motor 6 rotates according to the amount of oil discharged, and a generator MG directly connected to the constant-displacement hydraulic motor 6 is driven to generate power.

[0003]

By the way, in the above-mentioned conventional example, the input rotation obtained by rotating the windmill or the waterwheel using the wind energy or the hydraulic energy is high torque and very low rotation (~). In order to drive a normal hydraulic pump, it is necessary to increase the speed to a certain speed or more by a speed increaser because a stable pumping operation cannot be performed unless the input speed is more than a certain value.
For this reason, the windmill is rotated using wind energy,
In order to generate electricity, a wind turbine directly connected to a gearbox (heavy load) must be lifted to a height of several tens of meters above the ground and installed, resulting in large installation work and supporting heavy loads. The tower is also large in order to strengthen the tower, which increases the cost and raises the problem that the cost cannot be reduced.

Accordingly, the present invention relates to a power generator for rotating a windmill by using wind energy to generate power, and a pump function without using a gearbox for high torque and low-speed input rotation from the windmill. A low-speed, large-capacity pump is directly connected to a windmill, and a simple mechanism that can drive a generator by rotating a hydraulic motor at a constant speed with oil discharged from the pump, and can be manufactured and installed at low cost. It is an object of the present invention to provide a power generation device capable of reducing costs.

[0005]

According to a first aspect of the present invention, a wind turbine, a radial pump directly connected to a shaft of the wind turbine, and a variable displacement type pump connected to a high-pressure side and a low-pressure side pipe forming a closed circuit with the radial pump. It comprises a hydraulic motor, a generator directly connected to the variable displacement hydraulic motor, a charge pump and a relief valve connected via a check valve in the low-pressure line, and an electric motor for driving the charge pump.

According to a second aspect of the present invention, a wind turbine, a radial pump directly connected to a shaft of the wind turbine, a variable displacement hydraulic motor connected to a high pressure side and a low pressure side pipeline forming a closed circuit with the radial pump, and a variable displacement A generator directly connected to the hydraulic motor, a charge pump and a relief valve connected to the low-pressure line via a check valve, an electric motor for driving the charge pump, and a device for detecting the pressure in the low-pressure line. Pressure sensor, and a controller connected to control the electric motor with a signal from the pressure sensor, the pressure in the low-pressure side line based on the signal from the pressure sensor is minimized from the charge pump. Hold in quantity.

In a third aspect, the number of revolutions of the electric motor driving the charge pump is variably controlled.

In the fourth invention, a plurality of charge pumps and an electric motor for driving the charge pump are provided, and the electric motors are sequentially driven.

In a fifth aspect, a charge pump and a plurality of electric motors for driving the charge pump are provided, and the number of rotations of some of the electric motors is variably controlled.

In the sixth invention, the wind turbine, a radial pump directly connected to the shaft of the wind turbine, a variable displacement hydraulic motor connected to the radial pump through high-pressure and low-pressure pipelines, and a direct connection to the variable displacement hydraulic motor A generator, a charge pump and a relief valve connected to the low-pressure side pipe via a check valve, an electric motor that drives the charge pump, and a pressure sensor provided to detect the low-pressure side pipe internal pressure, A controller that inputs a signal from the pressure sensor, and a regulator that adjusts the discharge amount of the variable displacement charge pump with an output signal from the controller, and charges the pressure in the low-pressure side pipe based on the signal from the pressure sensor Hold with minimum discharge from pump.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same components as those of the conventional example will be denoted by the same names and symbols.

In the wind power generator according to the first embodiment, as shown in FIG. 1, reference numeral 1 denotes a wind turbine (or a propeller) that receives and rotates wind power, and a hydraulic pump is mounted on a shaft 2 of the wind turbine 1. 4A is directly connected and installed at the top of a tower (not shown).

The hydraulic pump 4A comprises a high-torque, low-speed, large-capacity star-shaped radial piston pump (hereinafter referred to as a radial pump), and is installed on a ground side (not shown) via a high-pressure pipe 5a and a low-pressure pipe 5b. And is connected to the variable displacement hydraulic motor 6A to form a closed circuit.

A generator MG is directly connected to the output shaft 6a of the variable displacement hydraulic motor 6A.

A constant-capacity charge pump (hereinafter referred to as charge pump) 8 is connected to a pipe 9 via a check valve 7 from a low-pressure pipe 5b on the suction side of the radial pump 4A.

The charge pump 8 is driven by an electric motor M.

A relief valve 10 is provided to release excess oil from a pipe 9 connecting the charge pump 8 and the check valve 7 to the tank T so as to keep the low-pressure pipe 5b at a constant pressure.

Next, the operation will be described. Now, when the charge pump 8 is driven by the electric motor M and the pressure oil is being supplied to the low-pressure side pipeline 5b, the wind acts on the windmill 1 and when the windmill 1 rotates, the shaft of the windmill 1 is rotated. 2 drives the radial pump 4A.

When the radial pump 4A is driven, oil is supplied to the variable displacement hydraulic motor 6A via the high pressure side pipe line 5a, and the variable displacement hydraulic motor 6A responds to the rotation of the wind turbine 1 by the radial pump 4A. Is adjusted so as to be a constant rotation based on the discharge amount of, and the generator MG is driven at a constant rotation speed to generate power.

When the rotation speed of the wind turbine 1 is low speed (up to 40 rpm)
m), the discharge amount of the radial pump 4A is large, and sufficient hydraulic oil is supplied to the hydraulic motor 6A to maintain the hydraulic motor 6A at a constant rotational speed, and the hydraulic motor 6A is rotated to start the generator MG. Drives at a constant speed to generate electricity.

As described above, the radial pump 4A capable of pumping a high torque and a low input speed from the wind turbine 1 is directly connected to the wind turbine 1, and the variable displacement hydraulic motor 6A is driven by the oil discharged from the radial pump 4A. Rotate the generator M
Since the G is driven, the input rotation obtained by rotating the wind turbine 1 using the wind power is high torque, and is stable without the need for a gearbox even at a very low rotation speed (（40 rpm). The pump works and the weight of the gearbox as in the conventional example is reduced, so that a heavy object with the gearbox directly connected to the wind turbine 1 can be lifted to a height of several tens of meters above the ground and installed. Installation work, and the towers supporting heavy objects are not so strong, so that production costs can be reduced and cost can be reduced.

Next, a second embodiment shown in FIG.
The difference is that the rotation speed of the electric motor that drives the charge pump for supplying a constant pressure oil to the low-pressure side pipeline is variably controlled, and the other components are the same as those of the first embodiment. Here, only the different configuration will be described, and the details of the other components will be omitted.

Therefore, the power generating device of the second embodiment is
A pressure sensor S is provided in the low-pressure side line 5b.
Is input to the controller C, and the number of revolutions of the electric motor M is variably (inverter) controlled based on the signal from the controller C.

When the pressure in the low pressure side pipe line 5b changes with the rotation of the radial pump 6A, a signal from the pressure sensor S is input to the controller C, and the number of rotations of the electric motor M is changed by the signal from the controller C. And the low pressure side line 5b
By supplying the required minimum amount of oil from the charge pump 8 through the check valve 7, the wasteful flow rate is not generated, which can save energy.

The third embodiment shown in FIG.
This differs from the second embodiment in the configuration in which a plurality of charge pumps for supplying a constant pressure oil to the low pressure side pipeline and a plurality of electric motors for driving the charge pumps are provided. Thus, here, only the different configuration will be described, and the details of the other components will be omitted.

Therefore, the power generating device according to the third embodiment is
Charge pumps 8A, 8B, 8C and charge pumps 8A, 8B, 8 for supplying constant pressure oil to the low pressure side pipeline 5b.
A plurality of electric motors M1, M2, and M3 for driving C are provided, and a signal from a pressure sensor S provided in the low-pressure side pipe line 5b is input to the controller C. , M2, M3 are sequentially driven as necessary (M1 → M2 → M3), and the charge pump 7
Check valves 7A, 7B, 7 from A, 7B, 7C respectively
By supplying the necessary minimum amount of oil to the low-pressure side pipe line 5b via C, it is possible to prevent unnecessary surplus flow rate and to save energy.

Further, the fourth embodiment shown in FIG.
A plurality of charge pumps for supplying constant pressure oil to the low pressure side pipeline and a plurality of electric motors for driving the charge pumps are provided, and a configuration in which the rotation of some of the electric motors is variably controlled is different. Other configurations are the same as those of the second embodiment. Here, only different configurations will be described, and details of other components will be omitted.

Therefore, the power generating device according to the fourth embodiment is as follows.
Pressure pumps 8D and 8E for supplying a constant pressure oil to the low-pressure pipe 5b and a plurality of electric motors M4 and M5 for driving the charge pumps 8D and 8E are provided, and a pressure sensor provided in the low-pressure pipe 5b. The signal from S is input to the controller C, and the electric motor M4 is first driven based on the signal from the controller C to rotate the charge pump 8D.
The oil from the charge pump 8D is supplied to the low-pressure side line 5b via the check valve 7D. If the pressure in the low-pressure side line 5b is not kept constant, the required amount is reduced by the electric motor M5.
Is variably controlled to supply the minimum necessary oil amount from the charge pump 8E to the low-pressure-side pipe line 5b via the check valve 7E, thereby preventing unnecessary surplus flow rate from being generated and conserving energy. be able to.

Further, the fifth embodiment shown in FIG.
A plurality of charge pumps for supplying a constant pressure to the low pressure side pipeline and a plurality of electric motors for driving the charge pumps are provided,
Some of the charge pumps are of variable displacement type to control the discharge amount.
This embodiment is the same as that of the first embodiment. Here, only different configurations will be described, and details of other components will be omitted.

Therefore, the power generating device according to the fifth embodiment is
Electric motors M6, M for driving constant-capacity charge pump 8F, variable-capacity charge pump 8G and charge pumps 8F, 8G for supplying constant pressure oil to low-pressure side pipeline 5b.
7, a signal from a pressure sensor S provided in the low-pressure side pipeline 5b is input to the controller C, and the discharge of the variable displacement charge pump 8G is performed via the regulator R based on the signal from the controller C. The amount is variable, and a constant pressure oil is supplied to the low-pressure side line 5b by the electric motor M6.
Is supplied from a constant capacity charge pump 8F driven by
If the amount is still insufficient, the required amount is variably controlled through the regulator R to control the discharge amount of the variable displacement charge pump 8G.
Thus, the minimum necessary oil amount is supplied to the low-pressure side pipe line 5b via the valve, so that a useless surplus flow rate is not generated, thereby contributing to energy saving.

[0031]

According to the first aspect of the present invention, there is provided a radial pump directly connected to a shaft of a wind turbine, a variable displacement hydraulic motor connected to a high-pressure side and a low-pressure side pipe forming a closed circuit with the radial pump, Utilizes wind power because it consists of a generator directly connected to the displacement hydraulic motor, a charge pump and a relief valve connected to the low-pressure line via a check valve, and an electric motor that drives the charge pump. When the input rotation obtained by rotating the wind turbine is high torque, and even at a very low rotation speed (up to 40 rpm), a stable pump action can be performed without the need for a speed increaser, and as in the conventional example, the speed increase is achieved. The weight of the machine is reduced, and the heavy load directly connected to the wind turbine with the gearbox is lifted to a height of several tens of meters above the ground, eliminating the need for large-scale installation work such as installation, and supporting the heavy load. Tower No longer be so much stronger, manufacturing costs can also be reduced, an effect that the cost can be reduced.

According to the second aspect of the present invention, the radial pump directly connected to the shaft of the wind turbine, the variable displacement hydraulic motor connected to the high pressure side and the low pressure side pipeline forming a closed circuit with the radial pump, and the variable displacement A generator directly connected to the hydraulic motor, a charge pump and a relief valve connected to the low-pressure line via a check valve, an electric motor for driving the charge pump, and a pressure detector for detecting the pressure in the low-pressure line. Pressure sensor, and a controller connected to control the electric motor with a signal from the pressure sensor, the pressure in the low-pressure side line based on the signal from the pressure sensor is minimized from the charge pump. The charge pump is supplied with the minimum necessary amount of oil from the charge pump via the check valve to the low-pressure side line so that unnecessary excess flow is not generated. There is an effect that help to save energy by.

According to the third aspect of the present invention, the number of revolutions of the electric motor for driving the charge pump is variably controlled, so that the required minimum amount of oil is supplied from the charge pump to the low-pressure line via the check valve. To prevent wasteful flow rate from being generated, which is effective for energy saving.

According to the fourth aspect of the present invention, a plurality of charge pumps and an electric motor for driving the charge pump are provided, and the electric motors are sequentially driven. Therefore, the charge pump is connected to the low-pressure line via the check valve via the check valve. By supplying the necessary minimum oil amount, it is possible to prevent the useless excess flow rate from being generated, which is effective for energy saving.

According to the fifth aspect, the charge pump and the plurality of electric motors for driving the charge pump are provided, and the number of rotations of some of the electric motors is variably controlled.
By supplying the required minimum amount of oil from the charge pump via the check valve to the low-pressure side pipe line, it is possible to prevent unnecessary surplus flow rate from being generated, which is effective for energy saving.

According to the sixth aspect of the invention, the radial pump directly connected to the shaft of the wind turbine, the variable displacement hydraulic motor connected to the radial pump through the high pressure side and the low pressure side pipeline, and the direct connection to the variable displacement hydraulic motor A generator, a charge pump and a relief valve connected to a low-pressure line via a check valve,
An electric motor for driving the charge pump, a pressure sensor provided to detect the pressure in the low-pressure side pipe, a controller for inputting a signal from the pressure sensor, and a discharge amount of the variable displacement charge pump based on an output signal from the controller The pressure in the low-pressure side line is maintained with the minimum discharge amount from the charge pump based on the signal from the pressure sensor, so the low-pressure side line is checked by the charge pump. By supplying the required minimum amount of oil through the valve, it is possible to prevent the useless excess flow rate from being generated and to save energy.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a power generation device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a power generator according to a second embodiment.

FIG. 3 is a schematic configuration diagram of a power generator according to a third embodiment.

FIG. 4 is a schematic configuration diagram of a power generator according to a fourth embodiment.

FIG. 5 is a schematic configuration diagram of a power generator according to a fifth embodiment.

FIG. 6 is a schematic configuration diagram of a power generation device showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Windmill 2 shaft 3 Gearbox 4 Variable displacement hydraulic pump 4A Radial pump 5a, 5b High pressure side, low pressure side line 6 Fixed displacement hydraulic motor 6A Variable displacement hydraulic motor 7, 7A, 7B, 7C, 7D, 7E , 7F, 7G Check valve 8, 8A, 7B, 7C, 7D, 7E, 7F, 7G Charge pump 9 Pipe line 10 Relief valve C Controller M, M1, M2, M3, M4, M5, M6, M7 Electric motor MG Power generation Machine S pressure sensor T tank

Claims (6)

[Claims] 1. A wind turbine, a radial pump directly connected to a shaft of the wind turbine, a variable displacement hydraulic motor connected to a high pressure side and a low pressure side pipeline forming a closed circuit with the radial pump, and a variable displacement hydraulic motor. A power generator comprising: a directly-connected generator; a charge pump and a relief valve connected to a low-pressure side pipe via a check valve; and an electric motor for driving the charge pump. 2. A wind turbine, a radial pump directly connected to a shaft of the wind turbine, a variable displacement hydraulic motor connected to a high pressure side and a low pressure side pipeline forming a closed circuit with the radial pump, and a variable displacement hydraulic motor. A charge pump and a relief valve connected to the low-pressure pipe via a check valve, an electric motor for driving the charge pump, and a pressure sensor provided to detect the low-pressure pipe internal pressure. And a controller connected to control the electric motor with a signal from the pressure sensor, and holds the pressure in the low-pressure side pipe with a minimum discharge amount from the charge pump based on the signal from the pressure sensor. A power generating device characterized by the above. 3. The power generator according to claim 2, wherein the number of revolutions of an electric motor for driving said charge pump is variably controlled. 4. The power generator according to claim 2, wherein a plurality of said charge pumps and an electric motor for driving said charge pump are provided, and said electric motors are sequentially driven. 5. The power generator according to claim 2, wherein a plurality of said charge pumps and a plurality of electric motors for driving said charge pumps are provided, and a number of rotations of some of said electric motors is variably controlled. 6. A wind turbine, a radial pump directly connected to a shaft of the wind turbine, a variable displacement hydraulic motor connected to the radial pump via high-pressure and low-pressure pipelines, and a generator directly connected to the variable displacement hydraulic motor. A charge pump and a relief valve connected to the low-pressure side pipe via a check valve, an electric motor for driving the charge pump, a pressure sensor provided to detect the low-pressure side pipe pressure, and a pressure sensor. A signal input controller; and a regulator for adjusting the discharge amount of the variable displacement charge pump based on an output signal from the controller. Based on a signal from the pressure sensor, the pressure in the low-pressure side pipe is minimized from the charge pump. A power generator characterized in that the discharge amount is held at a minimum.