WO2007073665A1

WO2007073665A1 - A wind electricity generating device and system

Info

Publication number: WO2007073665A1
Application number: PCT/CN2006/003370
Authority: WO
Inventors: Xiaoping Duan
Original assignee: Xiaoping Duan
Priority date: 2005-12-12
Filing date: 2006-12-12
Publication date: 2007-07-05
Also published as: CN1982700A

Abstract

The application relates to a wind electricity generating technology which dissolves the problems such as high cost of the conventional wind electricity generating device due to using the mechanical transmission. A wind electricity generating device is provided, wherein a wind wheel (101) rotates a hydraulic pump (102) which pressurizes the inputting liquid (generally hydraulic oil) and discharges it to a hydraulic motor (104) through transmitting line (107); the hydraulic motor (104) is rotated by the pressurized liquid and runs an electric generator (105) to generate electricity. On the basis of the wind electricity generating device, there is further provided a hydraulic accumulator (103) for collecting several lines of highly pressurized liquid, then N sets of such wind wheels (101) and hydraulic pumps (102) share a set of hydraulic motor (104), hydraulic accumulator (103), reservoir(106) and generator (105), wherein N is an integral number more than one.

Description

Wind power generation device and system

The present invention relates to wind power generation technology and, more particularly, to a liquid power type wind power generation apparatus and system. Background technique

Today, with petrochemical and coal-fired energy sources fading, wind power has become one of the key directions for human energy development. The data show that the total amount of wind energy resources that can be developed globally is about twice the total amount of human energy demand. The richness of wind energy and natural regenerability are the most attractive reasons.

Wind power technology originated in Europe, and countries such as Denmark, the Netherlands, and Germany have been developing and advocating wind power for more than 20 years. Since the birth of wind power technology, it has undergone continuous improvement, and has developed into a relatively mature horizontal axis, three-blade, tapered tubular tower and other structural forms. Current large wind turbines typically use a horizontal shaft type consisting of a tower, a rotor, a gearbox (acceleration gearbox), a generator, an offset device, a control system, and the like. The role of the wind wheel is to convert wind energy into mechanical energy. It consists of a vane with good gas flow performance on the axle. The low-speed rotating wind turbine accelerates the gearbox through the transmission mechanism, and then transmits the power to the generator. The wind wheel is supported by a tall tower. Since the wind direction will change frequently, in order to effectively use the wind energy, an automatic windward offset device must be provided, which according to the wind direction signal measured by the wind direction sensor, and then pushes the wind wheel to keep it Face the windward side. It can be seen that the traditional wind power generation device has a one-to-one mechanical connection relationship between the wind wheel, the transmission mechanism and the generator, and this feature causes the following problems in the existing wind power generation technology.

1. In order to meet the power scale and the intensity of the disaster-resistant wind, the manufacturing cost will be greatly increased. In the existing wind power generation technology, it is usually pursued that the power of the single machine is as large as possible. At present, the development of wind power generation equipment of more than 1500kw has become an established trend. The wind turbine of this unit is large, with a diameter of more than 60 meters, and is installed on a tower of several tens of floors. According to reports, California has installed a giant wind turbine with a power of 3000kw and a diameter of 300 feet. For such huge wind wheels and towers, they are required to withstand the catastrophic winds in their area, so their strength requirements are very high, and carbon fiber must be used. High-strength materials such as dimensional and glass steel are used to make the manufacturing cost greatly increased.

2. To meet the power scale, it will have a negative impact on the environment.

On the one hand, the above-mentioned huge wind wheels and tall towers will cause damage to the local natural landscape, especially in the city and tourist areas, which is even more intolerable. In addition, when the propeller-type wind turbines work, they generate strong noise and become a source of noise that is not disturbing day and night. In the Netherlands and Germany, there have been demonstrations of residents protesting against wind power construction projects. At present, the minimum distance required for wind turbines to leave their homes is usually 500 meters, which makes the selection of areas suitable for wind turbine installations greatly reduced.

3. The contradiction between the ultra-low speed of the wind wheel and the economic speed of the generator leads to a further increase in cost.

For the above-mentioned large-sized wind wheel, the rotation speed is usually low, about 30 rpm. This extremely low speed is far from the economic speed of the generator. When the shaft is directly coupled, the size, weight and cost of the generator will be greatly increased. In order to achieve a reasonable matching of the rotational speed, an appropriate mechanical shifting device is required. The existing products usually have a multi-stage planetary gearbox mounted on the tower, and the speed increase ratio is 50-70 or even 80 or more. The box is very bulky and weighs 50 to 100 tons, making it very difficult to transport and install. In addition, the insertion loss of the multi-stage speed increasing mechanism will also reduce the efficiency of the entire generator set, which will reduce the efficiency of the whole machine by about 26%, resulting in serious waste of supporting resources.

4. Independently operated unit structure increases construction costs

It can be seen from the foregoing description that in the prior art, the wind wheel, the transmission mechanism and the generator are in a one-to-one mechanical connection relationship, and two or more wind wheels cannot be used to drive the same generator, which makes the wind turbine The construction has always remained high. At present, the construction cost of large wind turbines still stays at around 8,000 yuan/kW, and the cost of small wind turbines is even higher. Summary of the invention

In view of the above-mentioned deficiencies of the prior art, the present invention solves the problems of high cost and the like caused by the conventional mechanical power transmission device due to the use of a purely mechanical transmission mode. .

In order to solve the above technical problem, the present invention provides a wind power generation apparatus including a tower, a wind wheel, a generator, and a transmission mechanism that can transmit power of the wind turbine to the generator to drive it to rotate; The transmission mechanism includes: a hydraulic pump that can pressurize and output the input liquid when rotating, a hydraulic motor that can generate a rotating effect under the driving of the high-pressure liquid, and a liquid storage tank for storing an appropriate amount of the transmission liquid;

a rotating shaft of the hydraulic pump is directly or indirectly connected to a rotating shaft of the wind wheel, and a high pressure output port of the hydraulic pump is connected to a high pressure input port of the hydraulic motor through a first infusion tube, and the low pressure of the hydraulic pump The input port is connected to the outlet of the liquid storage tank through a second infusion tube;

The rotating shaft of the hydraulic motor is directly or indirectly connected to the rotating shaft of the generator, and the low-pressure output port of the hydraulic motor is connected to the input port of the liquid storage tank through a third infusion pipe.

The present invention also provides a wind power generation system including a tower, a wind wheel, a generator, and a transmission mechanism that can transmit power of the wind turbine to the generator to drive it to rotate;

The transmission mechanism includes: a hydraulic pump that can pressurize and output the input liquid when rotating, a hydraulic motor that can generate a rotating effect under the driving of the high-pressure liquid, a liquid collection tank for collecting the multi-channel high-pressure liquid, and a storage tank for storing a suitable amount of the transmission liquid;

The tower, the wind wheel and the hydraulic pump in the wind power generation system are each N, and share the same set of hydraulic motor, liquid collection tank, liquid storage tank and generator, wherein N is an integer greater than 1;

A wind wheel is arranged on each tower, and the rotating shaft of each wind wheel is directly or indirectly connected with the rotating shaft of a hydraulic pump; the output port of each hydraulic pump is input through the first infusion tube and the liquid collecting tank Port connection, the input port of each hydraulic pump is connected to the output port of the liquid storage tank via a second infusion tube; the rotating shaft of the hydraulic motor is directly or indirectly connected with the rotating shaft of the generator; The input port of the motor is connected to the output port of the liquid collecting tank via a fourth infusion tube, and the output port of the hydraulic motor is connected to the input port of the liquid storage tank via a third infusion tube.

It can be seen from the above scheme that the power transmission is no longer transmitted by the conventional gear transmission mechanism, but the power is transmitted through the liquid and the corresponding device. The energy loss of the liquid transmission mode is small, and the generator is easily realized. Push the hook. More importantly, the power of multiple wind turbines can be concentrated to the same generator through the collection of liquid pipelines, thereby saving construction costs and improving power generation efficiency. Since the same generator can be driven by a plurality of wind wheels, the volume of the wind wheel can be reduced accordingly, thereby reducing other additional manufacturing costs. DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Figure 1 is a schematic diagram of a wind power generator in a preferred embodiment of the present invention;

2 is a schematic diagram of a wind power generation system in a preferred embodiment of the present invention. detailed description

In a preferred embodiment of the present invention, the principle of the wind power generator is shown in Fig. 1. The thick arrows in the figure indicate the mechanical shaft drive, and the thin line arrows indicate the liquid drive.

Disassembled from Fig. 1, the wind power generator includes a wind wheel 101, a hydraulic pump 102, a hydraulic motor 104, a generator 105, a reservoir 106, and three infusion tubes 107, 109, 110. In the specific implementation, of course, towers, offset devices, control circuits, etc. are also included, but only the parts related to the working principle of the wind power generation device are mainly described here.

Among them, the wind wheel 101 is used to convert wind energy into rotational mechanical energy. Regarding the working principle, structure, and the like of the wind wheel, it is a mature prior art. When the wind blows, it can be rotated by the wind and outputted to the hydraulic pump 102 connected thereto through the rotating shaft. In order to further improve the efficiency of the entire wind power generation device, the inventors of the present invention will also improve the structure of the wind wheel in subsequent patents to enhance its real-time automatic offset to adapt to the current wind direction.

The hydraulic pump 102 is used to add the input liquid (by the hydraulic oil) to a high pressure and then output. In this embodiment, the rotating shaft of the hydraulic pump is fixedly coupled to the rotating shaft of the wind wheel so as to be rotatable in synchronization with the wind wheel. When the hydraulic pump is rotated, the transmission liquid can be sucked from the reservoir tank 106 through the second infusion tube 110, pressurized, and output through the first infusion tube 107. Regarding the structure and working principle of the hydraulic pump, it is also a mature prior art. In this embodiment, a rotary hydraulic pump is used. During the rotation process, the volume of the suction chamber is generated from a small to large vacuum, and the volume of the oil discharge chamber is Large and small squeeze oil and drain oil. If a multi-stage hydraulic pump is used, the pressure of the transmission fluid can be discharged to 10-25 MPa. The inventors of the present invention will also improve the structure of the hydraulic pump in subsequent patents to enhance its pressurization efficiency.

The action of the hydraulic motor 104 is exactly the opposite of that of the hydraulic pump, which receives the high pressure liquid that the hydraulic pump inputs through the first infusion tube 107, and generates rotation under the action of the high pressure liquid. The rotating shaft of the hydraulic motor 104 is fixedly connected to the rotating shaft of the generator 105, so that the synchronous rotation of the generator can be driven. High pressure After the liquid flows through the hydraulic motor and drives it to rotate, the pressure is released and flows into the reservoir tank 106 through the third infusion tube 109. Regarding the structure and working principle of the hydraulic motor, it is also a mature prior art, and a rotary hydraulic motor is used in this embodiment. The inventors of the present invention will also improve the structure of the hydraulic pump in subsequent patents to enhance its pressurization efficiency.

The generator 105 in this embodiment may be a direct current generator or an alternator, which rotates in synchronization with the hydraulic motor, thereby converting mechanical energy into electrical energy and outputting it to a corresponding load. The reservoir 106 in this embodiment is used to store an appropriate amount of transmission fluid to ensure proper flow of the transmission fluid between the various components.

In the real-time, it is preferable to adopt various means of the prior art, for example, by means of a pressure regulating valve, etc., so that the pressure of the high-pressure liquid outputted by the hydraulic pump is kept at a constant level as much as possible, and the rotational speed of the hydraulic motor is kept as constant as possible. A variable speed transmission mechanism can be added between the hydraulic motor and the generator to finally achieve the purpose of ensuring uniform rotation of the generator.

The components in the above embodiments are no longer a simple mechanical connection, but a hydraulic transmission effect is introduced so that the power of the wind turbine can be transmitted to the generator at a remote location through the infusion tube. Based on this, the wind power generation system shown in Fig. 2 can be further produced.

Compared with Fig. 1, the liquid collecting tank 103 and the fourth infusion pipe 108 are added to the embodiment shown in Fig. 2, and two sets of wind wheel + hydraulic pump set are provided. In the specific implementation, more sets of wind wheel + hydraulic pump set can be set, that is to say, the tower, the wind wheel and the hydraulic pump in the wind power generation system can be N, and share the same set of hydraulic motor and liquid collecting tank , a reservoir and a generator, where N is an integer greater than one.

The liquid collection tank 103 is configured to receive the high pressure liquid outputted by each of the hydraulic pumps 102, and is collectively outputted to the same hydraulic motor 104 through the fourth infusion tube 108.

Wherein, the rotating shaft of each wind wheel is directly or indirectly connected with the rotating shaft of a hydraulic pump, so that the hydraulic pump can be driven to rotate together; the output port of each hydraulic pump passes through a first infusion tube and a liquid collecting tank The input port is connected, and the input port of each hydraulic pump is connected to the output port of the reservoir through a second infusion tube. Therefore, in this embodiment, there are two first infusion tubes 107 and two second infusion tubes 110. The output of the hydraulic motor is still connected to the input port of the reservoir through the third infusion tube 109.

It can be seen from the above scheme that in the present invention, the power is no longer transmitted by the conventional gear transmission mechanism, but the power is transmitted through the liquid and the corresponding device, and the energy loss of the liquid transmission method. Small, easy to achieve uniform driving of the generator. More importantly, the power of multiple wind turbines can be concentrated to the same generator through the collection of liquid pipelines, thereby saving construction costs and improving power generation efficiency. Since the same generator can be driven by a plurality of wind wheels, the volume of the wind wheel can be reduced accordingly, thereby reducing the other: additional manufacturing costs.

Claims

Rights request

A wind power plant comprising a tower, a wind wheel, a generator, and a transmission mechanism that transmits power of the wind turbine to the generator to drive it to rotate;

The transmission mechanism includes: a hydraulic pump that can pressurize and output the input liquid when rotating, a hydraulic motor that can generate a rotating effect under the driving of the high-pressure liquid, and a liquid storage tank for storing an appropriate amount of the transmission liquid;

2. A wind power generation system comprising a tower, a wind wheel, a generator, and a transmission mechanism that transmits power of the wind turbine to the generator to drive it to rotate;