WO2015092912A1

WO2015092912A1 - Electric power generation system

Info

Publication number: WO2015092912A1
Application number: PCT/JP2013/084186
Authority: WO
Inventors: 了仁小畑; 向井　寛
Original assignee: 株式会社日立製作所
Priority date: 2013-12-20
Filing date: 2013-12-20
Publication date: 2015-06-25

Abstract

The purpose of the present invention is to provide an electric power generation system such that the temperature of hydraulic fluid can be more accurately controlled. In order to solve the aforementioned problem, this electric power generation system is characterized by being equipped with: blades (1) that rotate by receiving an external force; a hydraulic pump (3) that is driven with rotation of the blades (1), boosts the pressure of hydraulic fluid sucked therein, and discharges the resulting hydraulic fluid; a nacelle (4) that houses the hydraulic pump (3); a tower (5) that supports the nacelle (4); a hydraulic motor (7) that is driven by the hydraulic fluid discharged from the hydraulic pump (3); an electric power generator (8) that is connected to the hydraulic motor (7); a first line through which the hydraulic fluid is sent from the hydraulic pump (3) to the hydraulic motor (7); a second line through which the hydraulic fluid is returned from the hydraulic motor (7) to the hydraulic pump (3); and a heat-exchange device (14) that rotates together with the nacelle (4) and exchanges heat with the hydraulic fluid.

Description

Power generator

TECHNICAL FIELD The present invention relates to a power generator that performs power generation operation by transmitting rotational energy of blades and rotors rotated by kinetic energy such as wind, tidal current, ocean current, river flow, etc., as pressure energy of hydraulic oil to a generator. Related to temperature management of

In recent years, a renewable energy type power generation device using renewable energy has become widespread as a power generation device, and the size of the device is increasing for the purpose of further improving the power generation efficiency. Renewable energy power generators are devices that generate motive power by converting the kinetic energy of wind, tidal currents, ocean currents, or river currents to rotational energy of the rotor, and further using the rotational energy of the rotor to generate power. .
In the conventional power generator, the rotational energy of the rotor is mechanically transmitted by a shaft or a gear type gearbox and input to the generator. Since the rotor and the generator are mechanically connected in this way, when installing this device, the shaft, support part, gear type gearbox, generator, etc. to which the rotor is connected are called nacelles. The nacelle is stored in a storage unit, and is installed, for example, around a place where renewable energy is captured.
Usually, a nacelle of a renewable energy type power generation device is installed at a certain distance from the ground, such as a high place or underwater, in order to efficiently capture renewable energy. For example, in a wind turbine generator, the nacelle is supported from several tens of meters to hundreds of tens of meters in order to efficiently acquire wind energy. Further, for example, in tidal current / sea current or river power generation, a nacelle is installed in water. In such a place, since accessibility from the ground is poor, the work and maintenance of installing a nacelle containing a gearbox and a generator, which are heavy objects, are expensive.

On the other hand, in place of the conventional mechanical power transmission, a renewable energy power generation apparatus using a hydraulic power transmission device combining a hydraulic pump and a hydraulic motor has attracted attention. In the hydraulic power transmission, the rotational energy of the rotor is converted into hydraulic energy by a hydraulic pump, and the power is transmitted. Therefore, the power can be transmitted to an arbitrary location using a pipe that transports hydraulic oil. Therefore, in a renewable energy type power generator using hydraulic power transmission, a heavy generator and a maintenance-purpose power generator or hydraulic motor can be installed at a location with good accessibility.

For example, Patent Document 1 describes a wind power generator in which a hydraulic pump is provided in a nacelle, a hydraulic motor and a generator are provided in a lower portion of a tower that supports the nacelle, and the hydraulic pump and the hydraulic motor are connected by piping. Has been.
In Patent Document 2, a regenerative energy type power generator connected from a hydraulic pump provided in a nacelle to a hydraulic motor installed around a tower base using two relatively rotatable pipes. An apparatus is described.

On the other hand, renewable energy power generators equipped with hydraulic power transmission are often installed in environments where the ambient temperature, water temperature, and other ambient temperature changes are large in order to capture renewable energy. The hydraulic oil temperature used for power transmission also changes. The viscosity of the hydraulic oil changes greatly due to temperature change, and adversely affects the components of the hydraulic power transmission device such as reduced efficiency and reduced life. For example, the hydraulic oil has a high viscosity at low temperatures, and energy loss during oil feeding increases, the viscosity becomes low at high temperatures, and the sliding portion wears due to a decrease in the lubricity of the constituent devices. Therefore, in a power generator provided with a hydraulic power transmission device, it is required to keep hydraulic oil at an appropriate temperature.

In this regard, Patent Document 3 describes a configuration in which the hydraulic power transmission circuit is efficiently cooled by exchanging heat with a cold water source including seawater, lake water, river water, or groundwater around the tower base.

International Application Publication No. 2009/064192 Patent No. 4950368 International Application Publication No. 2012 / 137370A1

On the other hand, in the wind power generator shown in

Patent Document

1 or 2, in order to transmit power between the nacelle and the tower base, the hydraulic pump and the hydraulic motor are installed apart by a tower height. Therefore, the pipe connecting the hydraulic pump and the hydraulic motor has a length corresponding to the tower height. In this way, when the hydraulic pump and the hydraulic motor are arranged at separate locations and connected between them by piping, heat is exchanged between the surrounding environment and the hydraulic oil in the piping installation path, and temperature control is accurately performed. There is a risk that you cannot do it. In particular, the tower height increases with the increase in the size of the wind turbine generator, and when the pipe length is further extended, or when the pipe is placed in water, such as tidal currents, ocean currents, or river current power generation, it is more accurate. Temperature control becomes difficult. As described above, the viscosity of the hydraulic oil changes greatly with changes in temperature, and adversely affects the components of the hydraulic power transmission device such as reduced efficiency and reduced life.

In this respect, Patent Documents 1 to 3 do not sufficiently consider the influence of the length of the pipe and the surrounding environment in the pipe installation path on the hydraulic oil, so the temperature of the hydraulic oil used for hydraulic power transmission, particularly the hydraulic equipment, is not considered. There is a possibility that the temperature of the flowing hydraulic oil cannot be accurately controlled. Therefore, an object of the present invention is to provide a power generator that can perform temperature control of hydraulic oil more accurately.

In order to solve the above-described problems, in the power generation device according to the present invention, a blade that rotates by receiving an external force, a hydraulic pump that is driven as the blade rotates, pressurizes sucked hydraulic oil, and discharges the hydraulic oil; A nacelle that houses the hydraulic pump, a tower that supports the nacelle, a hydraulic motor driven by the hydraulic oil discharged from the hydraulic pump, a generator connected to the hydraulic motor, and the hydraulic pump A first line for sending the hydraulic oil from the hydraulic motor to the hydraulic motor, a second line for returning the hydraulic oil from the hydraulic motor to the hydraulic pump, and heat that rotates together with the nacelle and heat-exchanges the hydraulic oil An exchange device is provided.
Further, in another aspect of the power generator according to the present invention, a blade that rotates by receiving an external force, a hydraulic pump that is driven along with the rotation of the blade, pressurizes the sucked hydraulic oil, and discharges the hydraulic oil; A nacelle that houses the hydraulic pump, a tower that supports the nacelle, a foundation that supports the tower, a hydraulic motor that is driven by the hydraulic oil discharged from the hydraulic pump, and is connected to the hydraulic motor. A generator, a first line for sending the hydraulic oil from the hydraulic pump to the hydraulic motor, a second line for returning the hydraulic oil from the hydraulic motor to the hydraulic pump, and a foundation. It is characterized by comprising a heat exchange device for exchanging heat of the hydraulic oil flowing through the first line.
In still another aspect of the power generator according to the present invention, a blade that rotates by receiving an external force, a hydraulic pump that is driven along with the rotation of the blade, pressurizes the sucked hydraulic oil, and discharges the hydraulic oil; A nacelle that houses a hydraulic pump, a tower that supports the nacelle, a foundation that supports the tower, a hydraulic motor that is driven by the hydraulic oil discharged from the hydraulic pump, and is connected to the hydraulic motor A generator, a first line for sending the hydraulic oil from the hydraulic pump to the hydraulic motor, a second line for returning the hydraulic oil from the hydraulic motor to the hydraulic pump, and the base portion, A heat exchanging device for exchanging heat of the hydraulic oil flowing through the second line, wherein the first line and the second line are at least partially covered with a heat insulating material; and Or characterized in that it is constituted by at least partially insulated double pipe of the line.

According to the present invention, the temperature of the hydraulic oil can be controlled more accurately.

It is an example of the whole block diagram of the electric power generating apparatus described in Example 1. FIG. 1 is a hydraulic power transmission circuit diagram of a power generator described in Embodiment 1. FIG. It is a whole block diagram of the electric power generating apparatus described in Example 1, and is the figure which added cooling mechanisms, such as a generator. It is a whole block diagram of the electric power generating apparatus described in Example 2. FIG. It is a fragmentary sectional view which shows the heat insulation structure of the hydraulic piping described in Example 2. FIG. It is a whole block diagram of the electric power generating apparatus described in Example 3, and is the figure which added the heat exchange part. It is a fragmentary sectional view of the heat exchange part 500 described in Example 3. FIG.

Hereinafter, examples will be described with reference to the drawings. In addition, the following is only an Example to the last, and it is not the meaning which intends that the embodiment of this invention is limited to the following specific aspect.

In Example 1, a wind power generation apparatus will be described with reference to FIGS. 1 to 3 as an example of a power generation measure. FIG. 1 is a diagram showing an overall configuration of a wind turbine generator 100 according to the present embodiment, and a thick line arrow in the drawing represents a flow of hydraulic oil. FIG. 2 shows a circuit diagram of hydraulic power transmission, and a broken line shows a control signal input / output to / from the controller 17.

Although FIG. 1 illustrates an offshore wind power generator installed on the water surface 19, the wind power generator 100 may be installed on land.

As shown in FIG. 1 and FIG. 2, the wind turbine generator 100 according to the present embodiment mainly includes a blade 1 a and a hub 1 b, a rotor 1 that rotates by receiving wind, and a support member 2 that supports the rotor 1. The hydraulic pump 3 driven by the rotation of the rotor 1 to increase the pressure of the hydraulic oil sucked from the suction port and discharge the hydraulic oil from the discharge port, the nacelle 4 housing the support member 2 and the hydraulic pump 3, and the nacelle 4 A tower 5 that supports the top 5a of the tower, a base 6 that supports the base 5b of the tower 5, a hydraulic motor 7 that is driven by the hydraulic oil discharged from the hydraulic pump 3 and is installed on the base 6; A generator 8 connected to the hydraulic motor 7, a high-pressure line 10 that sends hydraulic oil from the hydraulic pump 3 to the hydraulic motor 7, a low-pressure line 9 that returns hydraulic oil from the hydraulic motor 7 to the hydraulic pump 3, and a foundation 6 Heat exchanger installed And a temperature sensor 11 that measures the temperature of hydraulic oil flowing into the heat exchange device 13 and an outlet of the heat exchange device 13, and flows out of the heat exchange device 13. A temperature sensor 12 that measures the temperature of the hydraulic oil, a heat exchange device 14 installed in the nacelle 4, and a temperature that is provided at the inlet of the heat exchange device 14 and measures the temperature of the hydraulic oil flowing into the heat exchange device 14 A sensor 15 and a temperature sensor 16 which is provided at the suction port of the hydraulic pump 3 and measures the temperature of the hydraulic oil flowing into the hydraulic pump 3 are included. The heat exchange device 14 rotates together with the nacelle, but may be arranged inside or outside the nacelle, and further arranged inside and outside the nacelle.

The rotor 1 is composed of at least one blade 1 a and a hub 1 b, and the blades 1 a are attached radially around the rotation axis of the rotor 1. The hub 1b is connected to a support member 2 accommodated in the nacelle 4, and supports the rotor 1 rotatably.

The support member 2 may serve as a rotating shaft that transmits the rotational energy of the rotor 1 that rotates by receiving wind to the hydraulic pump 3, supports only the weight of the rotor 1 and the load due to wind, and the rotational energy is You may transmit to the hydraulic pump 3 by the hub 1b. In addition, the arrangement position of the support member may not be inside the nacelle.

The nacelle 4 is mainly provided with a support member 2 and a hydraulic pump 3. A part of the low-pressure line 9 that supplies hydraulic oil sucked by the hydraulic pump 3 and a part of the high-pressure line 10 that sends the discharged hydraulic oil to the hydraulic motor 7 are also accommodated in the nacelle 4. A heat exchange device 14 is installed on the outer wall of the nacelle 4. The nacelle 4 may be separated into a space where the outside air communicates and a space where the outside air cannot freely enter and exit. In this case, if the heat exchange device 14 is arranged in a space communicated with the outside air, the cooling effect can be obtained. I can expect.
The nacelle 4 is rotatably supported by the tower 5 so that the rotor 1 faces the wind direction. Therefore, a swivel joint 18 that rotatably connects the high pressure line 10 and the low pressure line 9 in the tower 5 and the nacelle 4 is used.

For the tower 5, the tower base on the side attached to the base portion 6 is 5 b, the tower tip on the side to which the nacelle is attached is 5 a, and the distance L from the base 5 a to the tip 5 b is the tower height. The high-pressure line 10 and the low-pressure line 9 installed in the tower 5 in the present embodiment are steel pipes or flexible hydraulic pipes. The hydraulic pump 3 installed in the nacelle 4 and the hydraulic motor installed in the foundation 6. Transport hydraulic fluid to The high pressure line 10 and the low pressure line 9 may be collectively referred to as hydraulic piping.

The hydraulic pump 3 is driven by the rotational energy of the rotor 1 and generates high-pressure hydraulic oil. This high-pressure hydraulic oil is supplied to the hydraulic motor 7 disposed at the base 5 b of the tower 5 by the high-pressure line 10. The hydraulic motor 7 is driven by the high-pressure hydraulic oil, and generates electric power by driving a generator 8 connected to the hydraulic motor 7.

The hydraulic oil discharged from the hydraulic motor 7 flows through the low-pressure line 9 and is controlled to a predetermined temperature by the heat exchange device 13 arranged in the base portion 6. After the hydraulic oil exiting the heat exchange device 13 is fed into the nacelle 4 from the base 5b of the tower 5 by the low pressure line 9, passes through the heat exchange device 14 in the nacelle 4, and is brought to a predetermined temperature. Then, it is sucked into the hydraulic pump 3 again.

Here, the heat exchange device 13 installed in the foundation 6 and the heat exchange device 14 installed in the nacelle 4 according to the present invention will be described. As shown in FIG. 2, the heat exchange device 13 in the present embodiment includes a heat exchanger 13a, a refrigerant line 13b, a heat exchanger 13c, and a cooling fan 13d. In the heat exchanger 13a, the hydraulic oil flowing in the low pressure line 9 and the refrigerant flowing in the refrigerant line 13b exchange heat. The heat exchanger 13c exchanges heat between the refrigerant flowing in the refrigerant line 13b and a medium such as outside air. The amount of heat exchange performed by the heat exchanger 13c can be adjusted by controlling the inflow amount of a medium such as outside air using the cooling fan 13d.
As shown in FIG. 2, the heat exchange device 14 includes a heat exchanger 14a and a blower fan 14b. The heat exchanger 14a performs heat exchange between the hydraulic oil flowing in the low pressure line 9 and a medium such as outside air. In addition, when the heat exchanger 13c or the heat exchanger 14a is installed in water, the ventilation fan 13d and the ventilation fan 14b mean the apparatus which generate | occur | produces a water flow. You may enable it to control each rotation speed of the ventilation fan 13d and the ventilation fan 14b. Thereby, the flow rate which sends media, such as external air, to a heat exchanger can be adjusted, and the heat exchange amount of hydraulic oil or a refrigerant | coolant and media, such as external air, can be adjusted. In the case of a water-based wind power generator in which the power generator according to the present invention is disposed on the water such as on the ocean or on the lake, and the blade 1 receives wind to rotate, the heat exchange device installed on the foundation 6 Of these, the heat exchanger 13c far from the line through which the hydraulic oil flows may be formed so as to exchange heat with the water around the wind turbine generator by installing it below the water surface.

Further, the

heat exchange device

13 or 14 may be provided with a heater, that is, both heat and cooling may be performed. As a result, when the wind power generator is placed in a cold region, etc., and the hydraulic oil drops below the specified temperature due to heat exchange with the outside environment, it is heated by the heater to bring the hydraulic oil to an appropriate oil temperature. Can keep. Moreover, the

heat exchange apparatus

13 or 14 shall have a function of both cooling and heating. Accordingly, the description of the refrigerant, cooling, etc. is not limited to that for lowering the temperature. Of course, the case where only one of the functions of cooling or heating is provided is not excluded.
The heat exchange device 13 is connected to the low pressure line 9 and is installed in the base portion 6. As shown in FIG. 1, in the present embodiment, the heat exchange device 13 is partly installed inside the tower 5 and partly outside. It may be installed in. As described above, since the heat exchange device 13 is installed on the base portion 6, it is not limited to a specific space as in the tower 5 or the nacelle 4, and the size and weight of the heat exchange device 13 are flexible. Increase. When at least a part of the heat exchange device is arranged outside the tower, it is possible to use a device having a high heat exchange performance in which the heat transfer area of the heat exchange unit is large.

Further, since the heat exchanging device 13 is installed on the foundation part 6, in the case of an offshore wind power generator in which the foundation part 6 is installed on the ocean, seawater or the like can be used as a refrigerant for heat exchange. Moreover, when arrange | positioning on the land, it can heat-exchange efficiently by comprising the heat exchange apparatus 13 so that heat exchange with the underground etc. with a large heat capacity may be performed.

In addition, since the heat exchange device 13 is installed on the base portion 6 with good accessibility, the heat exchange device 13 can be easily maintained.

The heat exchange device 14 is installed in the nacelle 4. Therefore, it can be installed at a position closer to the hydraulic pump than the heat exchange device 13 by a distance corresponding to the tower height. Therefore, when controlling the temperature of the hydraulic oil flowing into the hydraulic pump, the heat exchange device 14 is closer to the nacelle 4 that is closer to the hydraulic pump than the heat exchange device 13 disposed on the base portion 6 that supports the tower base. Since it is arranged, the responsiveness is good and the influence of heat exchange with the external environment is small, so that temperature control can be accurately performed.

Further, the heat exchange device 14 is installed in the nacelle 4 attached to the tip 5a of the tower 5 having a predetermined height. There is no obstacle to block the wind at the tip of the tower compared to the ground, and the wind speed is high. Therefore, heat exchange can be performed at a higher wind speed, and the hydraulic oil can be efficiently cooled.

In this embodiment, the temperature sensor 11 is provided at the inlet of the heat exchange device 13 and measures the temperature of the hydraulic oil flowing into the heat exchange device 13. The temperature sensor 11 is provided at the outlet of the heat exchange device 13. A temperature sensor 12 for measuring the temperature of the hydraulic oil flowing out is provided.

Similarly, a temperature sensor 15 provided at the inlet of the heat exchange device 14 for measuring the temperature of the hydraulic oil flowing into the heat exchange device 14 and a hydraulic oil provided at the suction port of the hydraulic pump 3 and flowing into the hydraulic pump 3. A temperature sensor 16 is provided for measuring the temperature.

The target value temperature of the hydraulic oil is set at the installation positions of these

temperature sensors

11, 12, 15, and 16, respectively.

Further, the blower fan 13d is obtained from the hydraulic oil temperatures T1, T2, T3, T4 acquired from the

temperature sensors

11, 12, 15, 16 and the target hydraulic oil temperature at the hydraulic pump inlet and the heat exchanger 13 outlet. A controller 17 for operating the blower fan 14b is provided.

The controller 17 controls the rotational speed of the cooling fan 13d from the hydraulic oil temperature T1 measured by the temperature sensor 11, the hydraulic oil temperature T2 measured by the temperature sensor 12, and the target value temperature at the position of the temperature sensor 12. Can do. Thereby, the temperature of the hydraulic oil at the installation position of the temperature sensor 12 can be accurately controlled with power saving.

Similarly, the controller 17 determines the rotation speed of the cooling fan 14b from the hydraulic oil temperature T3 measured by the temperature sensor 15, the hydraulic oil temperature T4 measured by the temperature sensor 16, and the target value temperature at the position of the temperature sensor 16. Can be controlled. Thereby, the temperature of the hydraulic oil at the installation position of the temperature sensor 16 can be accurately controlled with power saving. Furthermore, in this embodiment, since the temperature sensor 16 is provided at the suction port of the hydraulic pump 3, the temperature of the hydraulic oil flowing into the hydraulic pump 3 can be accurately controlled.

Further, the controller 17 sets this portion between the portions 9a to 9b of the low pressure line 9 based on the difference between the temperature T3 of the hydraulic fluid measured by the temperature sensor 15 and the temperature T2 of the hydraulic fluid measured by the temperature sensor 12. The amount of heat exchange with the surrounding environment can be estimated. Thereby, control of hydraulic oil temperature can be performed by power saving by adjusting the rotation speed of the ventilation fan 14b or the ventilation fan 13d.

Further, FIG. 3 shows a configuration in which the generator 8 and the low-pressure line 9 are added with a heat exchanger 8a for exchanging heat. In the heat exchange device 13, the generator 8 can be cooled via the heat exchanger 8a by setting the hydraulic oil temperature T2 of the temperature sensor 12 to the hydraulic oil temperature necessary for cooling the generator 8. Further, by using the heat exchange device 14 installed in the nacelle 4 to cool again the amount of heat exchanged between the generator 8 and the hydraulic oil, the hydraulic oil can be supplied with the optimum temperature to the hydraulic pump 3. Is possible. Similarly, when an apparatus such as the transformer 20 is installed, the transformer 20 is cooled by providing the hydraulic oil flowing through the low-pressure line 9 and the heat exchanger 20a that the transformer 20 performs heat exchange. can do. Here, the transformer 20 has been described as an example, but other devices may be used. For example, a heat exchanger can be similarly provided for a power converter installed in a tower. The heat exchanger can be appropriately changed according to the state of accommodation of the equipment in the tower, such as being provided in one or both of the power converter and the transformer.

As described above, even when an apparatus that needs to be cooled is disposed between 9a and 9b of the low-pressure line 9, the heat exchange device, the temperature sensor, and the controller are included, and therefore cooling is necessary. The temperature of the hydraulic oil flowing into the hydraulic pump 3 can be managed while cooling the device.

In the present embodiment, the case where the hydraulic oil flowing through the low-pressure line 9 is heat-exchanged in the heat exchanging device 13 arranged in the base portion 6 is formed so that the hydraulic oil flowing through the high-pressure line 10 is heat-exchanged. You may do it. In that case, since the temperature can be adjusted immediately before the hydraulic motor 7, more accurate temperature control becomes possible. In implementing this aspect, it is desirable that a temperature sensor be provided on the downstream side of the heat exchange device disposed in the high-pressure line 10, and it is more preferable that a temperature sensor be provided on the upstream side of the heat exchange device. By providing it downstream, the temperature of the hydraulic fluid discharged from the heat exchange device can be managed, which is preferable. Furthermore, finer control becomes possible by arranging temperature sensors both upstream and downstream. As an example of the control, the adjustment of the rotation speed of the fan is taken as an example here, but it is needless to say that the control is not limited to this, and other control is possible. As an example, when a heat exchanger is disposed below the water surface, the amount of water flowing into the heat exchanger below the water surface may be controlled.

It should be noted that it is desirable to provide a temperature sensor on the downstream side of other heat exchange devices in this specification, and it is more preferable to provide a temperature sensor on the upstream side of the heat exchange device. By providing it downstream, the temperature of the hydraulic fluid discharged from the heat exchange device can be managed, which is preferable. Furthermore, finer control becomes possible by arranging temperature sensors both upstream and downstream.

Example 2 will be described with reference to FIGS. In the second embodiment, a heat insulating mechanism for insulating the low pressure line 9 or the high pressure line 10 is provided in place of the heat exchanging device 14, the temperature sensor 15, and the controller 17 of the first embodiment, and the regeneration shown in FIG. In the possible energy type power generation device 200, the description of the components having the same functions as the configurations denoted by the same reference numerals shown in FIGS.

In FIG. 4, the gray portions around the low-pressure line 9 and the high-pressure line 10 represent a heat insulation mechanism.

FIG. 5 shows a cross section perpendicular to the flowing direction of the hydraulic oil in order to represent the low pressure line 9 or the high pressure line 10 to which the heat insulation mechanism is attached. The arrow in the figure represents the direction in which the hydraulic oil flows.

First, the heat insulation mechanism 310 is attached so as to cover the hydraulic piping as shown in FIG. The heat insulating material 310a is made of a highly heat insulating material such as glass wool. Thus, by setting it as the structure which covers a heat insulating material around hydraulic piping, since it can attach after installing hydraulic piping, hydraulic piping can be thermally insulated at low cost. Moreover, the heat insulating material 310a may have a function of absorbing and holding hydraulic oil. Thereby, even if hydraulic fluid leaks from hydraulic piping, the inside of the tower 5, the nacelle 4, etc. is not polluted with hydraulic fluid.

Further, as in the heat insulation mechanism 320 shown in FIG. 5B, a new pipe 320a may be provided on the outside so that the pipe has a double structure to achieve heat insulation performance. A space 320b between the hydraulic pipe and the pipe 320a may be filled with air. By using air that is lightweight and has high heat insulation performance as a heat insulating material, the hydraulic piping can be insulated at low cost. The space 320b may be evacuated. By making the vacuum, the heat insulation performance of the hydraulic piping is remarkably increased, so that the space 320b can be narrowed and high heat insulation can be obtained in a small space. In addition, the double structure prevents the inside of the tower 5 and the nacelle 4 from being contaminated by the hydraulic oil even if the hydraulic oil leaks from the hydraulic piping.

In this embodiment, the heat insulation mechanism described above suppresses heat exchange with the outside air for all the paths of the low pressure line 9 and the high pressure line 10 as shown in FIG. Thereby, even when oil is supplied from the base 6 to the nacelle 4 using the low pressure line 9 having a distance equivalent to the tower height, it is less likely to be affected by outside air. Therefore, the operating oil temperature flowing into the hydraulic pump 3 can be managed by the heat exchanging device 13 installed in the base portion 6. Moreover, since the high pressure line 10 is also provided with a heat insulating mechanism, heat exchange with the outside air can be suppressed even when oil is fed from the nacelle 4 to the base portion 6.

In this embodiment, all the hydraulic pipes are provided with a heat insulating mechanism called a heat insulating material or a heat insulating double pipe, but such a heat insulating mechanism is provided with at least a part of each line such as a low pressure line or a high pressure line. But it ’s okay. That is, each line can be at least partially covered with a heat insulating material, or a part of the pipe can be constituted by a heat insulating double pipe. It is also possible to provide the heat insulating structure only in a certain part of the piping. For example, when heat insulation piping is provided only in a part of 9c to 9d of the low-pressure line 9 in FIGS. 1 to 3 of the first embodiment, the temperature of the hydraulic oil managed by the heat exchange device 14 is compared with the environment in the nacelle 4. The oil can be fed to the hydraulic pump 3 while being held without performing heat exchange. In other words, each line is at least partially covered with a heat insulating material, or a part of the pipe is formed of a heat insulating double pipe, so that a heat exchanger or a temperature sensor is installed at a position away from the hydraulic pump 3 or the hydraulic motor 7. Even if it is provided, accurate temperature control becomes possible. As a position away from the hydraulic pump 3 or the hydraulic motor 7, for example, a heat exchange part (a heat exchange device, a heat exchanger, a heat exchange part, or the like in general, which is arranged in the tower from the base part) ) And the like.
Moreover, the structure which provides the heat insulation mechanism called a heat insulating material or heat insulation double piping is not restricted to the structure of a present Example, It can apply similarly about what was demonstrated in Example 1 and Example 3. Needless to say. Furthermore, the present invention can be similarly applied to the scope of application of the present invention other than the specific modes of the embodiments.

Example 3 will be described with reference to FIGS. In the third embodiment, in addition to the first embodiment, a heat-insulating mechanism that insulates the low-pressure line 9 or the high-pressure line 10 is provided, and further, a heat exchanging unit 500 that performs heat exchange between the hydraulic oil in the low-pressure line 9 and the high-pressure line 10 is provided. Is. In the renewable energy type power generator 400 shown in FIG. 6, the description of the components having the same functions as those already described with reference to FIGS. 1 and 2 is omitted. .

In FIG. 6, the gray portions around the low-pressure line 9 and the high-pressure line 10 represent a heat insulation mechanism, which is described in the second embodiment.

In FIG. 6, a portion surrounded by a broken line is a portion provided with a mechanism in which the low pressure line 9 and the high pressure line 10 perform heat exchange, and a sectional view of the portion is shown in FIG. The arrows in FIG. 7 indicate the flow directions of hydraulic oil (low pressure oil and high pressure oil, respectively) in the low pressure line 9 and the high pressure line 10.

First, the heat exchanging unit 500 shown in FIG. 7 where the hydraulic oil in the low pressure line 9 and the high pressure line 10 exchange heat will be described. The heat exchanging unit 500 has a structure in which the high-pressure line 10 and the low-pressure line 9 are disposed adjacent to each other, the respective hydraulic pipes are covered with a heat transfer member 510, and they are brought into contact with each other. The heat transfer member 510 is made of a material having good thermal conductivity, and the high pressure oil flowing through the high pressure line 10 and the low pressure oil flowing through the low pressure line 9 exchange heat through this member. In addition, a heat insulating member 520 is provided on the outside thereof. The heat insulating member 520 may be the same as the heat insulating mechanism of the second embodiment.

In this embodiment, since the heat exchange unit 500 is provided, heat exchange can be performed between the high pressure line 10 and the low pressure line 9. Furthermore, the heat exchange efficiency can be improved by making the flows of the high-pressure line 10 and the low-pressure line 9 in the heat exchange section 500 face each other as indicated by arrows in FIG. When the hydraulic pump 3 converts rotational energy into hydraulic energy, the hydraulic oil heated by heat generated as a loss can be cooled in the high-pressure line 10. Furthermore, the changed temperature of the low-pressure oil can be cooled to the target value temperature of the temperature sensor 16 by the heat exchanged between the high-pressure oil and the low-pressure oil in the heat exchange device 14. Further, since the heat exchange amount in the heat exchanging unit 500 can be grasped from the temperature sensor 12 and the temperature sensor 15, the number of rotations of the cooling fan 13d and the cooling fan 14b is controlled by the controller 17 according to the heat exchange amount. Thus, heat exchange in the heat exchanging unit 500 can be controlled. In the present embodiment, a structure in which the high-pressure line 10 and the low-pressure line 9 are provided in the heat exchanging unit 500 is shown, but a double cylindrical structure in which the inside is a step-down line and the outside is a low-pressure line, The heat exchange performance can be improved by separating the high pressure line and the low pressure line into a plurality of lines and increasing the contact area.

100 (Renewable Energy Type) Power Generator (Example 1)
DESCRIPTION OF SYMBOLS 1 Rotor 2 Support member 3 Hydraulic pump 4 Nacelle 5 Tower 6 Base part 7 Hydraulic motor 8 Generator 9 Low pressure line 10 High pressure line 11 Temperature sensor 12 Temperature sensor 13 Heat exchange device 14 Heat exchange device 15 Temperature sensor 16 Temperature sensor 17 Controller 18 Swivel joint 19 Water surface 20 Transformer 200 Renewable energy power generator (Example 2)
310, 320 Thermal insulation mechanism 400 Renewable energy type power generator (Example 3)
500 Heat Exchanger 510 Heat Transfer Member 520 Heat Insulation Member

Claims

A blade that rotates in response to an external force;
A hydraulic pump that is driven along with the rotation of the blade, pressurizes the sucked hydraulic oil, and discharges the hydraulic oil;
A nacelle for housing the hydraulic pump;
A tower that supports the nacelle;
A hydraulic motor driven by the hydraulic oil discharged from the hydraulic pump;
A generator connected to the hydraulic motor;
A first line for sending the hydraulic oil from the hydraulic pump to the hydraulic motor;
A second line for returning the hydraulic oil from the hydraulic motor to the hydraulic pump;
A power generation device comprising a heat exchange device that rotates together with the nacelle and heat exchanges the hydraulic oil.
The power generation device according to claim 1,
A foundation for supporting the tower;
A power generation device comprising a heat exchange device arranged on the foundation and configured to exchange heat with the hydraulic oil.
The power generation device according to claim 2,
In the heat exchanging device disposed in the base portion, the hydraulic oil flowing through the second line is heat-exchanged.
A blade that rotates in response to an external force;
A hydraulic pump that is driven along with the rotation of the blade, pressurizes the sucked hydraulic oil, and discharges the hydraulic oil;
A nacelle for housing the hydraulic pump;
A tower that supports the nacelle;
A foundation for supporting the tower;
A hydraulic motor driven by the hydraulic oil discharged from the hydraulic pump;
A generator connected to the hydraulic motor;
A first line for sending the hydraulic oil from the hydraulic pump to the hydraulic motor;
A second line for returning the hydraulic oil from the hydraulic motor to the hydraulic pump;
A power generation device comprising: a heat exchanging device arranged in the base portion for exchanging heat of the hydraulic oil flowing through the first line.
The power generator according to any one of claims 1 to 4,
The first line and the second line are at least partially covered with a heat insulating material, and / or are configured with at least partially a heat insulating double pipe in the line.
A blade that rotates in response to an external force;
A hydraulic pump that is driven along with the rotation of the blade, pressurizes the sucked hydraulic oil, and discharges the hydraulic oil;
A nacelle for housing the hydraulic pump;
A tower that supports the nacelle;
A foundation for supporting the tower;
A hydraulic motor driven by the hydraulic oil discharged from the hydraulic pump;
A generator connected to the hydraulic motor;
A first line for sending the hydraulic oil from the hydraulic pump to the hydraulic motor;
A second line for returning the hydraulic oil from the hydraulic motor to the hydraulic pump;
Whether the hydraulic oil is disposed on the foundation and exchanges heat with the hydraulic fluid flowing through the second line, and is the first line and the second line at least partially covered with a heat insulating material? And / or at least part of the line is constituted by a heat insulating double pipe.
In the electric power generating apparatus as described in any one of Claim 1 thru | or 6,
A power generation device, wherein a temperature sensor is disposed downstream of the heat exchange device in the hydraulic oil flow path.
The power generator according to claim 7,
A power generation device, wherein a temperature sensor is disposed upstream of the heat exchange device in the hydraulic oil flow path.
The power generator according to any one of claims 1 to 8,
A power generator, wherein a temperature sensor for measuring a temperature of the hydraulic oil flowing into the hydraulic pump is arranged.
The power generator according to any one of claims 7 to 9,
The power generator further comprising a controller that controls the heat exchange performance of the heat exchange device using the temperature obtained from the temperature sensor.
The power generator according to claim 10,
The heat exchange device includes a fan that is controlled based on a command from the controller, and the heat exchange performance of the heat exchange device is controlled through the control of the fan.
The power generator according to claim 11,
Among the heat exchange devices, the heat exchange device arranged at the base includes a first heat exchanger in which the hydraulic oil exchanges heat, and the hydraulic oil in the first heat exchanger. And a second heat exchanger for exchanging heat between the refrigerant flowing through the refrigerant line and the refrigerant flowing through the refrigerant line.
The power generator according to claim 12,
The power generation device is a water-mounted wind power generation device that is arranged on the water and receives the wind to rotate the blades.
In the second heat exchanger, the refrigerant exchanges heat with water around the wind power generator.
The power generator according to any one of claims 1 to 13,
The first line is a high-pressure line, the second line is a low-pressure line, and hydraulic fluid flowing through the first line is higher in pressure than hydraulic fluid flowing through the second line. Power generator.
The power generator according to claim 14,
A power generation apparatus comprising: a heat exchanging unit that performs heat exchange between the low-pressure line and the high-pressure line.
In the electric power generating apparatus as described in any one of Claims 1 thru | or 15,
The power generator further comprising a heat exchanger for exchanging heat between the generator and the second line.
The power generator according to any one of claims 1 to 16,
A power generator comprising: a transformer and / or a power converter disposed in the tower, and further comprising a heat exchanger for exchanging heat with the transformer and / or the power converter in the second line. .