Double-rotor wind power generation equipment

Abstract

The invention relates to the technical field of wind power generators, and discloses double-rotor wind power generation equipment which comprises a generator frame, a first driving shaft is rotatably connected to the inner side of the generator frame, a bearing overrun clutch is fixedly mounted on the inner side of the generator frame, a permanent magnet is fixedly connected to the interior of a magnetic core set, and a magnetic core is fixedly connected to the inner side of the permanent magnet. A stator is arranged in the magnetic core set, and the second driving shaft is sleeved with an annular current collector. According to the double-rotor wind power generation equipment, the overrun clutch is additionally arranged to prevent the rotors and the stator from rotating together, the generating capacity of the wind power generation unit is increased, normal rotation of the rotors and the stator under the action of the three-blade rotor is not interfered, it is guaranteed that the relative rotating speeds of the stator and the rotors are added, and power can be transmitted with the minimum loss through high generating voltage; the three-blade wind driven generator can ensure that a small cable cross section with acceptable loss is allowed to be used, and can generate more power by 40-50% than a traditional three-blade wind driven generator under the same wind power condition.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, specifically to a dual-rotor wind turbine generator. Background Technology

[0002] A wind turbine is a device that converts wind energy into electrical energy. It mainly consists of blades, a generator, mechanical components, and electrical components. Based on the different rotating shafts, wind turbines are mainly divided into two categories: horizontal axis wind turbines and vertical axis wind turbines. Currently, horizontal axis wind turbines dominate the market.

[0003] However, traditional three-bladed wind turbines in existing technologies have low wind energy utilization coefficients, with most of the wind energy being lost through the gaps between the blades. Furthermore, to achieve low power output, they incorporate large and bulky gearboxes inside the generator. On the one hand, the gearbox structure is very complex and expensive, requiring hydraulic systems and regular maintenance. On the other hand, gearbox operation requires equal shaft speeds; if they differ over a wide range, a gearbox must be used. Currently, downtime caused by gearboxes is increasing, and the gearbox structure easily affects the reliability and annual available hours of the entire wind turbine. Therefore, a specially designed dual-rotor wind turbine is proposed. By adopting a dual-rotor design, a highly integrated generator with independently driven stator and rotor replaces the traditional bulky gearbox. This significantly reduces the size and greatly enhances power generation efficiency, thereby solving the technical problems of difficult maintenance and frequent downtime associated with the gearbox structure of the aforementioned generators. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a dual-rotor wind power generation device that has the advantages of reducing generator design size and improving power generation efficiency. It solves the problems in the background technology of the traditional three-blade wind turbine with its large gearbox structure, which is difficult to maintain when a shutdown occurs, and easily affects the reliability and annual available hours of the wind turbine.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned goals of reducing generator design size and improving power generation efficiency, the present invention provides the following technical solution: a dual-rotor wind power generation device, including a generator frame, wherein a drive structure is provided on the inner side of the generator frame;

[0008] The drive structure includes a first drive shaft, a first angular contact bearing, a bearing overrunning clutch, a magnetic core assembly, a permanent magnet, a stator, a second angular contact bearing, a second drive shaft, and an annular current collector. The first drive shaft is rotatably connected to the inner side of the generator frame. The first angular contact bearing is movably mounted on the inner side of the generator frame. The bearing overrunning clutch is fixedly mounted on the inner side of the generator frame. The right end of the first drive shaft is fixedly connected to the magnetic core assembly. A permanent magnet is fixedly connected inside the magnetic core assembly. A stator is disposed inside the magnetic core assembly. The second angular contact bearing is movably mounted inside the magnetic core assembly. The second drive shaft is rotatably connected to the inner side of the magnetic core assembly. An annular current collector is sleeved on the outside of the second drive shaft.

[0009] Preferably, the generator frame includes a frame base and mounting columns. There are two mounting columns, and the inner top of each of the two mounting columns has an annular groove structure. There are two first angular contact bearings, which are located inside the two annular grooves respectively.

[0010] Preferably, the outer side of the first drive shaft passes through the inner side of one of the annular grooves and is rotatably connected to the inner side of the bearing overrunning clutch. The outer side of the first drive shaft is rotatably connected to the inner side of the bearing overrunning clutch, and a three-lobe rotor is fixedly connected to the left end of the first drive shaft.

[0011] Preferably, the magnetic core assembly is a thick-disc magnetic core structure, and the magnetic core assembly is made of soft magnetic steel. The right end of the first drive shaft has two No. 1 threaded holes, and the left side of the magnetic core assembly has two No. 2 threaded holes. The two No. 1 threaded holes are connected to the two No. 2 threaded holes respectively by two No. 1 threaded pins.

[0012] Preferably, the permanent magnet includes a first magnet and a second magnet, and there are two of each of the first magnet and the second magnet. The two first magnets and the two second magnets are distributed in an alternating magnetic pole position and are located on the inner left wall and the inner right wall of the magnetic core assembly, respectively.

[0013] Preferably, the stator is externally wound with a coil structure, and the stator is located in the middle region between two first magnets and two second magnets.

[0014] Preferably, the inner left and inner right walls of the magnetic core assembly are provided with slot structures, and there are two second angular contact bearings, which are located inside the two slots respectively. A sleeve block is rotatably connected to the inner side of one of the second angular contact bearings, and two No. 3 threaded holes are provided on the right side of the sleeve block.

[0015] Preferably, the outside of the second drive shaft is rotatably connected to the inside of another second angular contact bearing, the right end of the sleeve block and the left side of the second drive shaft are respectively fitted and fixed to the outside of the stator, and the left side of the second drive shaft is provided with two No. 4 threaded holes, and the two No. 3 threaded holes are respectively connected to the two No. 4 threaded holes through two No. 2 threaded pins.

[0016] Preferably, a five-bladed rotor is fixedly connected to the right end of the second drive shaft, the annular current collector has a copper graphite brush structure, and three cables are fixedly connected to the bottom of the annular current collector.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a dual-rotor wind power generation device, which has the following beneficial effects:

[0019] This dual-rotor wind turbine increases the power output of the wind turbine by adding a bearing overrunning clutch to prevent the rotor from rotating with the stator. However, it does not interfere with the normal rotation of the rotor and stator under the action of the three-bladed rotor. At this time, the relative speeds of the stator and rotor are added together, and a phase is composed of two superimposed layers. The magnets overlap two coils at the same time, which can double the voltage and significantly improve the efficiency of the generator. When generating wind power, the high generation voltage can be used to transmit power over a distance of up to 100 meters from the installation site to the controller, energy storage and inverter location with minimal loss. It can ensure that a smaller cable cross-section with acceptable loss can be used. Under the same wind conditions, it can generate 40-50% more power than the traditional three-bladed wind turbine. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external appearance of the wind turbine generator structure of the present invention;

[0021] Figure 2 This is a cross-sectional view of the wind turbine generator structure of the present invention;

[0022] In the diagram: 1. Generator frame; 101. Frame base; 102. Mounting column; 2. Drive structure; 201. First drive shaft; 202. First angular contact bearing; 203. Bearing overrunning clutch; 204. Magnetic core assembly; 205. Permanent magnet; 2051. First magnet; 2052. Second magnet; 206. Stator; 207. Second angular contact bearing; 208. Second drive shaft; 209. Ring current collector. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-2 A dual-rotor wind power generation device includes a generator frame 1, and a drive structure 2 is provided on the inner side of the generator frame 1.

[0025] The drive structure 2 includes a first drive shaft 201, a first angular contact bearing 202, a bearing overrunning clutch 203, a magnetic core assembly 204, a permanent magnet 205, a stator 206, a second angular contact bearing 207, a second drive shaft 208, and an annular current collector 209. The first drive shaft 201 is rotatably connected to the inner side of the generator frame 1. The first angular contact bearing 202 is movably installed on the inner side of the generator frame 1. The bearing overrunning clutch 203 is fixedly installed on the inner side of the generator frame 1. The magnetic core assembly 204 is fixedly connected to the right end of the first drive shaft 201. The permanent magnet 205 is fixedly connected inside the magnetic core assembly 204. The stator 206 is disposed inside the magnetic core assembly 204. The second angular contact bearing 207 is movably installed inside the magnetic core assembly 204. The second drive shaft 208 is rotatably connected to the inner side of the magnetic core assembly 204. The annular current collector 209 is sleeved on the outside of the second drive shaft 208.

[0026] Furthermore, the generator frame 1 includes a frame base 101 and mounting columns 102. There are two mounting columns 102, and the inner top of both mounting columns 102 has an annular groove structure. There are two first angular contact bearings 202, which are located inside the two annular grooves respectively.

[0027] Specifically, annular grooves are provided on the inner side of the top of the two mounting columns 102. The first drive shaft 201 and the second drive shaft 208 are rotatably connected to the inner side of the two annular grooves respectively. The two first angular contact bearings 202 are located inside the two annular grooves respectively and are rotatably connected to the outer side of the first drive shaft 201 and the second drive shaft 208 respectively.

[0028] Furthermore, the outside of the first drive shaft 201 passes through the inside of one of the annular grooves and is rotatably connected to the inside of the bearing overrunning clutch 203, and a three-lobe rotor is fixedly connected to the left end of the first drive shaft 201.

[0029] Specifically, the outside of the first drive shaft 201 is rotatably connected to the inside of the bearing overrunning clutch 203, and a three-lobe rotor is fixedly connected to the left end of the first drive shaft 201. Adding the bearing overrunning clutch 203 can prevent the rotor from rotating together with the stator 206, which can increase the power generation, but will not interfere with the normal rotation of the rotor and stator 206 under the action of the three-lobe rotor. The relative speeds of the stator 206 and the rotor will be added together.

[0030] Furthermore, the magnetic core assembly 204 is a thick disk-type magnetic core structure, and the magnetic core assembly 204 is made of soft magnetic steel. The right end of the first drive shaft 201 has two No. 1 threaded holes, and the left side of the magnetic core assembly 204 has two No. 2 threaded holes. The two No. 1 threaded holes are connected to the two No. 2 threaded holes respectively through two No. 1 threaded pins.

[0031] Specifically, after the No. 1 threaded hole on the right end of the first drive shaft 201 aligns with the No. 2 threaded hole on the left side of the magnetic core assembly 204, it is fixed by two No. 1 threaded pins to ensure that the first drive shaft 201 and the magnetic core assembly 204 are fixedly connected.

[0032] Furthermore, the permanent magnet 205 includes a first magnet 2051 and a second magnet 2052. There are two of each of the first magnet 2051 and the second magnet 2052. The two first magnets 2051 and the two second magnets 2052 are distributed in an alternating magnetic pole position and are located on the inner left wall and the inner right wall of the magnetic core assembly 204, respectively.

[0033] Specifically, the magnetic poles of the two first magnets 2051 and the two second magnets 2052 are opposite to each other and are distributed in an alternating magnetic pole position, which can ensure that the magnetic field in the middle region between the first magnets 2051 and the second magnets 2052 is in a normal state.

[0034] Furthermore, the stator 206 is externally wound with a coil structure, and the stator 206 is located in the middle region between the two first magnets 2051 and the two second magnets 2052.

[0035] Specifically, the stator 206 has coils wound around its exterior and is located in the middle magnetic field region between the two first magnets 2051 and the two second magnets 2052.

[0036] Furthermore, the inner left and inner right walls of the magnetic core assembly 204 are provided with slot structures. There are two second angular contact bearings 207, which are located inside the two slots respectively. One of the second angular contact bearings 207 is rotatably connected to a sleeve block on its inner side. The right side of the sleeve block is provided with two No. 3 threaded holes.

[0037] Specifically, the inner left and inner right walls of the magnetic core assembly 204 are provided with slots, and two second angular contact bearings 207 are located inside the two slots respectively. The inner sides of the two second angular contact bearings 207 are respectively rotatably connected to the sleeve block and the second drive shaft 208.

[0038] Furthermore, the outer side of the second drive shaft 208 is rotatably connected to the inner side of another second angular contact bearing 207. The right end of the sleeve block and the left side of the second drive shaft 208 are respectively fitted and fixed to the outer side of the stator 206. The left side of the second drive shaft 208 has two No. 4 threaded holes. The two No. 3 threaded holes are connected to the two No. 4 threaded holes through two No. 2 threaded pins respectively.

[0039] Specifically, the right end of the sleeve block and the left side of the second drive shaft 208 are fixed to the left and right sides of the stator 206, respectively. When the No. 3 threaded hole of the sleeve block is connected to the No. 4 threaded hole of the second drive shaft 208, the sleeve block, stator 206 and second drive shaft 208 are fixed by the No. 2 threaded pin.

[0040] Furthermore, a five-bladed rotor is fixedly connected to the right end of the second drive shaft 208, the annular current collector 209 has a copper graphite brush structure, and three cables are fixedly connected to the bottom of the annular current collector 209.

[0041] Specifically, when the three-lobe rotor starts to rotate clockwise, the first drive shaft 201 and the stator 206 with coils will rotate synchronously. When the five-lobe rotor starts to rotate counterclockwise, the second drive shaft 208 and the stator 206 with coils will start to rotate synchronously. Since the electromagnetic coupling between the magnetic systems of the stator 206 and the rotor is very large, it will try to drag the rotor to the back. Therefore, the relative speed between the stator 206 and the rotor is greatly reduced. Under low wind speeds, energy production will drop significantly.

[0042] In summary, this dual-rotor wind power generation equipment, by adding a bearing overrunning clutch 203 to prevent the rotor from rotating together with the stator 206, increases the power generation of the wind turbine generator set without interfering with the normal rotation of the rotor and stator 206 under the action of the three-bladed rotor. At this time, the relative speeds of the stator 206 and the rotor are added together, and one phase is composed of two superimposed layers. Furthermore, the magnets simultaneously overlap two coils, which can double the voltage and significantly improve the efficiency of the generator. During wind power generation, the high generation voltage can be used to transmit power with minimal loss over a distance of up to 100 meters from the installation site to the controller, energy storage, and inverter locations. This ensures that a smaller cable cross-section with acceptable losses can be used. Under the same wind conditions, it can generate 40-50% more power than a traditional three-bladed wind turbine generator.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-rotor wind power generation device, comprising a generator frame (1), characterized in that: The inner side of the generator frame (1) is provided with a drive structure (2); The drive structure (2) includes a first drive shaft (201), a first angular contact bearing (202), a bearing overrunning clutch (203), a magnetic core assembly (204), a permanent magnet (205), a stator (206), a second angular contact bearing (207), a second drive shaft (208), and an annular current collector (209). The first drive shaft (201) is rotatably connected to the inner side of the generator frame (1), and the first angular contact bearing (202) is movably mounted on the inner side of the generator frame (1). The inner side of the generator frame (1) is fixed. A bearing overrunning clutch (203) is installed. A magnetic core assembly (204) is fixedly connected to the right end of the first drive shaft (201). A permanent magnet (205) is fixedly connected inside the magnetic core assembly (204). A stator (206) is provided inside the magnetic core assembly (204). A second angular contact bearing (207) is movably installed inside the magnetic core assembly (204). A second drive shaft (208) is rotatably connected to the inner side of the magnetic core assembly (204). An annular current collector (209) is sleeved on the outside of the second drive shaft (208).

2. The dual-rotor wind power generation equipment according to claim 1, characterized in that: The generator frame (1) includes a frame base (101) and mounting columns (102). There are two mounting columns (102), and the inner top of each of the two mounting columns (102) has an annular groove structure. There are two first angular contact bearings (202), which are located inside the two annular grooves respectively.

3. The dual-rotor wind power generation equipment according to claim 2, characterized in that: The outside of the first drive shaft (201) passes through the inside of one of the annular grooves and is rotatably connected to the inside of the bearing overrunning clutch (203), and a three-lobe rotor is fixedly connected to the left end of the first drive shaft (201).

4. The dual-rotor wind power generation equipment according to claim 1, characterized in that: The magnetic core assembly (204) is a thick disk magnetic core structure and is made of soft magnetic steel. The right end of the first drive shaft (201) has two No. 1 threaded holes, and the left side of the magnetic core assembly (204) has two No. 2 threaded holes. The two No. 1 threaded holes are connected to the two No. 2 threaded holes respectively through two No. 1 threaded pins.

5. A dual-rotor wind power generation device according to claim 1, characterized in that: The permanent magnet (205) includes a first magnet (2051) and a second magnet (2052). There are two of each of the first magnet (2051) and the second magnet (2052). The two first magnets (2051) and the two second magnets (2052) are distributed in an alternating magnetic pole position and are located on the inner left wall and the inner right wall of the magnetic core assembly (204), respectively.

6. A dual-rotor wind power generation device according to claim 5, characterized in that: The stator (206) is wound with a coil structure on its outside, and the stator (206) is located in the middle region between two first magnets (2051) and two second magnets (2052).

7. A dual-rotor wind power generation device according to claim 1, characterized in that: The inner left and inner right walls of the magnetic core assembly (204) are provided with slotted structures. There are two second angular contact bearings (207), which are located inside the two slots respectively. A sleeve block is rotatably connected to the inner side of one of the second angular contact bearings (207). Two No. 3 threaded holes are provided on the right side of the sleeve block.

8. A dual-rotor wind power generation device according to claim 7, characterized in that: The outside of the second drive shaft (208) is rotatably connected to the inside of another second angular contact bearing (207). The right end of the sleeve block and the left side of the second drive shaft (208) are respectively fitted and fixed to the outside of the stator (206). The left side of the second drive shaft (208) has two No. 4 threaded holes. The two No. 3 threaded holes are connected to the two No. 4 threaded holes through two No. 2 threaded pins respectively.

9. A dual-rotor wind power generation device according to claim 1, characterized in that: The right end of the second drive shaft (208) is fixedly connected to a five-bladed rotor. The annular current collector (209) has a copper graphite brush structure. Three cables are fixedly connected to the bottom of the annular current collector (209).

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