Permanent magnet semi-suspension wind power generation equipment

Abstract

The permanent magnet semi-suspension wind power generation equipment comprises a wind wheel and a main shaft, the wind wheel is connected to the front end of the main shaft, a transmission assembly is arranged at the rear end of the main shaft, and the permanent magnet semi-suspension wind power generation equipment is provided with a supporting frame with a magnetic suspension bearing and an air bearing; a wind wheel direction; the main shaft sequentially penetrates through the magnetic suspension bearing and an air bearing; the transmission assembly comprises a driving gear and a planetary gear system; the planetary gear system comprises at least three uniformly arranged planetary gears and a planetary carrier for assembling the planetary gears; the at least three planetary gears are arranged around the driving gear, and the driving gear serves as a sun gear; the planet carrier is connected to a rotor of the generator. According to the scheme, a magnetic suspension bearing and air bearing main shaft matching mode is adopted, the main shaft is jointly supported through matching of the two bearings, shaking caused by main shaft rotation due to uncertain wind direction and wind power is reduced, and the stable main shaft is stable during rotation; the problem that in the prior art, when the wind direction and the wind power are unstable, rotation of the main shaft is unstable is solved.

Description

Technical Field

[0001] The present application relates to the field of power generation technology, and in particular to a wind power generation device. Background Art

[0002] In wind power generation equipment, the wind rotor relies on wind power to rotate and drive the generator to generate electricity. During this process, there is contact between the various components supporting the wind rotor, such as between gears, between the transmission main shaft and gears, etc. The friction between these components will generate considerable losses when the wind rotor rotates to offset the friction. These losses will reduce the power generation efficiency of the wind turbine. To reduce these losses, some wind power generation equipment will use magnetic bearings to reduce friction. However, the use of magnetic bearings has significant limitations. The application scenarios of wind power generation equipment often have very high wind speeds, but are also accompanied by unstable wind direction and wind force. When the wind direction and wind force are unstable, the main shaft rotation will vibrate. Moreover, the magnetic bearing has a large limit on the weight of the wind rotor when in use. If the wind rotor is too heavy, it will cause the main shaft to deviate, further increasing the vibration of the main shaft during rotation, making the operation unstable. Utility Model Content

[0003] One purpose of the present application is to provide a permanent magnet semi-suspended wind power generation device to solve at least one of the above-mentioned technical problems.

[0004] The present application provides a permanent magnet semi-suspended wind power generation device, comprising a wind wheel and a main shaft that rotates with the wind wheel, wherein the wind wheel is connected to the front end of the main shaft, and the rear end of the main shaft is provided with a transmission assembly connected to a generator, and a support frame that supports the main shaft, characterized in that:

[0005] The support frame has a magnetic bearing and an air bearing;

[0006] From the direction of the wind wheel, a magnetic suspension bearing and an air bearing are arranged in sequence;

[0007] The main shaft passes through the magnetic bearing and an air bearing in sequence;

[0008] The transmission assembly includes a transmission gear connected to the main shaft, called the driving gear;

[0009] The transmission assembly adopts a planetary gear system;

[0010] The planetary gear system includes at least three evenly arranged planetary gears and a planet carrier for assembling the planetary gears;

[0011] At least three planetary gears are arranged around a driving gear, with the driving gear serving as a sun gear;

[0012] The planet carrier is connected to the rotor of the generator.

[0013] Preferably, at least three planetary gears and the driving gear have an axial sliding connection structure;

[0014] The driving gear is provided with a limiting mechanism for limiting the sliding of the axial sliding connection structure.

[0015] Preferably, two magnetic suspension bearings are provided, and the air bearing is placed between the two magnetic suspension bearings and connected to the support frame;

[0016] The upward magnetic force of the two magnetic bearings is greater than 90% of the gravity of the main shaft.

[0017] Preferably, the wind wheel is made of carbon fiber material and has a wind cap connected to the front end of the main shaft and a plurality of blades;

[0018] The blade adopts an inner and outer double-layer structure, which is divided into an inner layer and an outer layer. The inner layer is made of foam plastic material, and the outer layer is made of carbon fiber material to wrap the inner layer.

[0019] The root of the blade is connected to the hood via a rotatable angle adjustment mechanism, wherein the angle adjustment mechanism comprises a rotatable rotating disk embedded in the hood, the root of the blade is inserted into the rotating disk, and the rotating disk is connected to a driving motor;

[0020] When the wind wheel rotates, the blade surface and the rotating surface of the wind wheel form a certain angle through the angle adjustment mechanism;

[0021] The main shaft is a hollow main shaft with an inner cavity, and the power input end of the driving motor is led out through the inner cavity.

[0022] Preferably, the length of the teeth of the driving gear is greater than 1 cm and less than 3 cm, and the length of the teeth of the planetary gear is greater than 3 mm and less than 6 mm.

[0023] Preferably, the rear end of the gear teeth of the driving gear is tilted forward;

[0024] The planetary gear is provided with a conical skirt, and the conical skirt is adapted to the inclination of the gear teeth of the driving gear;

[0025] The conical skirt is rotatably connected to the rear of the planetary gear via a bearing.

[0026] Preferably, the outer layer of the tapered skirt is a ceramic coating.

[0027] Preferably, the bearing and the tapered skirt are connected via an elastic mechanism provided with a return spring, and two ends of the return spring are respectively connected to the bearing and the tapered skirt.

[0028] Compared with the prior art, the present application provides a permanent magnet semi-suspended wind turbine generator, comprising a rotor and a main shaft that rotates with the rotor. The rotor is connected to the front end of the main shaft, and the rear end of the main shaft is provided with a transmission assembly connected to a generator, having a support frame supporting the main shaft, the support frame having a magnetic suspension bearing and an air bearing; the magnetic suspension bearing and the air bearing are arranged in sequence from the rotor direction; the main shaft passes through the magnetic suspension bearing and the air bearing in sequence; the transmission assembly includes a transmission gear connected to the main shaft, called a driving gear; the transmission assembly adopts a planetary gear system; the planetary gear system includes at least three evenly arranged planetary gears and a planetary carrier for assembling the planetary gears; at least three planetary gears are arranged around the driving gear, with the driving gear serving as the sun gear; the planetary carrier is connected to the rotor of the generator. This solution adopts a method of combining a magnetic suspension bearing and an air bearing main shaft, and the cooperation between the two bearings jointly supports the main shaft, reducing the vibration of the main shaft rotation caused by the uncertainty of wind direction and wind force, making the stable main shaft rotation more stable, and solving the problem of unstable main shaft rotation caused by unstable wind direction and wind force in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 This is a front and side view of one embodiment of the permanent magnet semi-suspended wind power generation device described in this application;

[0031] Figure 2 This is a rear side view of one embodiment of the permanent magnet semi-suspended wind power generation device described in this application;

[0032] Figure 3 This is a side view of one embodiment of the permanent magnet semi-suspended wind power generation device described in this application;

[0033] The same or similar reference numerals in the drawings represent the same or similar components. DETAILED DESCRIPTION

[0034] The following combination Figures 1 to 3 The above method of the present application is further elaborated.

[0035] The present application provides a permanent magnet semi-suspended wind power generation device, comprising a wind wheel and a main shaft rotating with the wind wheel, the wind wheel being connected to the front end of the main shaft, the rear end of the main shaft being provided with a transmission assembly connected to a generator, and having a support frame for supporting the main shaft, the support frame having a magnetic suspension bearing and an air bearing; from the direction of the wind wheel, the magnetic suspension bearing and the air bearing are arranged in sequence; the main shaft passes through the magnetic suspension bearing and the air bearing in sequence; the transmission assembly comprises a transmission gear connected to the main shaft, referred to as a driving gear 31; the transmission assembly adopts a planetary gear system; the planetary gear system comprises at least three evenly arranged planetary gears and a planetary carrier for assembling the planetary gears; at least three planetary gears are arranged around the driving gear, with the driving gear 31 being the sun gear; the planetary carrier is connected to the rotor of the generator.

[0036] The magnetic levitation bearing 4 and the air floating bearing 5 can be connected in series with the same main shaft 1. When the main shaft 1 rotates following the wind wheel 2, the magnetic levitation bearing 4 and the air floating bearing 5 can support the main shaft 1 at the same time. When the wind wheel 2 is stationary, the magnetic levitation bearing 4 can support it through magnetic force, and the air floating bearing can support the main shaft 1. When the main shaft 1 rotates, an air film is formed on the surface of the main shaft 1 in the air floating bearing 5 to support the main shaft 1 to rotate in the air. The magnetic levitation relies on magnetic force to jointly support the main shaft 1. Since there is no contact between the main shaft 1 and the components of the magnetic levitation bearing 4 and the air floating bearing 5, the friction force can be ignored.

[0037] A transmission assembly 3 is provided at the rear end of the main shaft 1. The transmission assembly 3 has two functions: one is to support the main shaft 1 within the magnetic bearing 4, preventing the main shaft 1 from escaping the mutually repelling magnetic field within the magnetic bearing 4, thereby preventing the main shaft 1 from extending backward; the other function is to transmit the force of the wind wheel 2 driving the main shaft 1 to the generator for power generation. In actual use, wind energy can be transferred to the generator through the transmission assembly 3, eliminating the contact between the support frame or other components and the main shaft 1, reducing energy loss during shaft rotation. Furthermore, when the magnetic bearing 4 is generating wind power, the air bearing 5 relies on the air film to support the main shaft 1. No other components are in contact with the main shaft 1, thereby minimizing the formation of friction. The transmission assembly 3 can both transfer wind energy to the generator for power generation and maintain the axial force of the magnetic bearing 4 on the main shaft 1, preventing the main shaft 1 from moving axially. The magnetic bearing, air bearing 5 and planetary gear system cooperate with each other, and in actual use can allow the main shaft 1 to produce an appropriate amount of axial displacement during rotation to balance the axial force generated by other factors during rotation, making the main shaft 1 more stable during operation.

[0038] In actual use, the main shaft 1 is stabilized by the magnetic bearing 4 and the air bearing 5, so that when the impeller rotates, even if the wind direction and wind force are unstable, the main shaft 1 will not easily vibrate, thereby stabilizing the main shaft 1 to the greatest extent, solving the problem in the prior art that the main shaft 1 will rotate unstably when the wind direction and wind force are unstable.

[0039] In some embodiments of the present application, at least three planetary gears and the driving gear have an axial sliding connection structure; and the driving gear is provided with a limiting mechanism for limiting the sliding of the axial sliding connection structure.

[0040] At least three planetary gears are used in the transmission assembly and have an axial sliding connection structure with the driving gear, which can balance the force generated by the main shaft and prevent it from excessive movement.

[0041] In some embodiments of the present application, two magnetic suspension bearings are provided, and the air bearing 5 is placed between the two magnetic suspension bearings and connected to the support frame; the upward magnetic force of the two magnetic suspension bearings is greater than 90% of the gravity of the main shaft.

[0042] The air bearing can be arranged between two magnetic bearings and supported by a support frame. The magnetic bearing can bear part of the weight of the main shaft. When the main shaft is stationary, the pressure on the contact surface between the main shaft and the air bearing in the air bearing is greatly reduced, so that the air bearing can use a lower air pressure to drive the main shaft to operate, greatly reducing the air pressure required to drive the main shaft to rotate in the air bearing. This not only makes the main shaft rotate more stably in the air bearing, but also allows the air model generated by the rotation of the main shaft to use a lower air pressure, thereby reducing the equipment and power consumption for controlling the air pressure, making its structure simpler and more environmentally friendly, and further reducing the use cost while improving its performance.

[0043] In some embodiments of the present application, the wind wheel 2 is made of carbon fiber material, and has a hood 21 connected to the front end of the main shaft 1 and several blades 22; the blades 22 adopt an inner and outer double-layer structure, which is divided into an inner layer and an outer layer, the inner layer is made of foam plastic material, and the outer layer is made of carbon fiber material to wrap the inner layer; the root of the blade 22 is connected to the wind hood 21 through a rotatable angle adjustment mechanism, and the angle adjustment mechanism has a rotatable rotating disk embedded in the wind hood 21, and the root of the blade 22 is inserted on the rotating disk, and the rotating disk is connected to a drive motor; when the wind wheel 2 rotates, the blade surface of the blade 22 is at a certain angle to the rotating surface of the wind wheel 2 through the angle adjustment mechanism; the main shaft 1 is a hollow main shaft with an inner cavity, and the power input end of the drive motor is led out through the inner cavity.

[0044] The wind rotor 2 can be made of carbon fiber. Leveraging its light weight, high strength, and corrosion resistance, this material can reduce the weight of the front end of the main shaft 1, allowing the main shaft 1 to remain nearly horizontal and improving its rotational stability. Furthermore, the blades 22 of the wind rotor 2 can be constructed with a two-layer structure. The inner layer can be made of foam plastic to further reduce costs, while the outer layer is wrapped with carbon fiber to address the inner layer's weak strength and susceptibility to corrosion. Furthermore, the coating on the surface of the blades 22 can be reduced or eliminated, further reducing costs.

[0045] In some embodiments of the present application, the main shaft is provided with a limiting mechanism for limiting the axial movement of the main shaft, and the limiting block of the limiting mechanism is a metal disc 11.

[0046] In some embodiments of the present application, the gear teeth of the driving gear 31 have a length greater than 1 cm and less than 3 cm, and the length of the planetary gear teeth is greater than 3 mm and less than 6 mm.

[0047] The main shaft relies on the planetary gears to maintain rotation. In actual use, the driving gear 31 and the planetary gears will inevitably shake during operation. If the teeth of the driving gear 31 are too short or the teeth of the planetary gears are too short, it may cause tooth hitting, thereby damaging the tooth structure. If the teeth of the driving gear 31 are too long or the teeth of the planetary gears are too long, it will cause jamming. The tooth length of the driving gear 31 is greater than 1 cm and less than 3 cm, and the length of the planetary gear teeth is greater than 3 mm and less than 6 mm. This can allow the two gears to have a certain shaking space, avoid jamming, and further increase the stability of operation.

[0048] In some embodiments of the present application, the rear end of the gear teeth of the driving gear 31 is tilted forward; the planetary gear is provided with a conical skirt 32, and the conical skirt 32 is adapted to the inclination degree of the gear teeth of the driving gear 31; the conical skirt 32 is rotatably connected to the rear of the planetary gear through a bearing.

[0049] The driving gear 31 is pressed onto the conical skirt 32 of the planetary gear. The conical skirt 32 can provide a portion of the rotation amplitude for the driving gear 31 to avoid tooth bite, and can provide support for the main shaft and the driving gear teeth to slide backward, further increasing the stability of operation.

[0050] In some embodiments of the present application, the outer layer of the tapered skirt 32 is a ceramic coating.

[0051] The outer layer of the tapered skirt 32 may be ceramic-plated to increase its hardness and wear resistance.

[0052] In some embodiments of the present application, the bearing and the tapered skirt 32 are connected via an elastic mechanism provided with a return spring, and the two ends of the return spring are respectively connected to the bearing and the tapered skirt 32.

[0053] The bearing and the tapered skirt 32 are connected by an elastic mechanism provided with a return spring. When the force acting backward on the main shaft becomes greater, the tapered skirt moves backward, and the return spring can provide a forward force to reset the tapered skirt, further increasing the stability of operation.

[0054] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalents of the claims be encompassed within the present invention. Any figure marks in the claims should not be regarded as limiting the claims involved. In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim may also be implemented by one unit or device through software or hardware. Words such as first and second are used to indicate names and do not indicate any particular order.

Claims

1. A permanent magnet semi-suspended wind turbine generator comprising a rotor and a main shaft that rotates with the rotor, wherein the rotor is connected to the front end of the main shaft, the rear end of the main shaft is provided with a transmission assembly connected to a generator, and a support frame for supporting the main shaft, characterized in that: The support frame has a magnetic bearing and an air bearing; From the direction of the wind wheel, a magnetic suspension bearing and an air bearing are arranged in sequence; The main shaft passes through the magnetic bearing and the air bearing in sequence; The transmission assembly includes a transmission gear connected to the main shaft, called the driving gear; The transmission assembly adopts a planetary gear system; The planetary gear system includes at least three evenly arranged planetary gears and a planet carrier for assembling the planetary gears; At least three planetary gears are arranged around a driving gear, with the driving gear serving as a sun gear; The planet carrier is connected to the rotor of the generator.

2. The permanent magnet semi-suspended wind power generation device according to claim 1, characterized in that: At least three planetary gears and the driving gear have an axial sliding connection structure; The driving gear is provided with a limiting mechanism for limiting the sliding of the axial sliding connection structure.

3. The permanent magnet semi-suspended wind power generation device according to claim 1, characterized in that: Two magnetic suspension bearings are provided, and the air bearing is placed between the two magnetic suspension bearings and connected to the support frame; The upward magnetic force of the two magnetic bearings is greater than 90% of the gravity of the main shaft.

4. The permanent magnet semi-suspended wind power generation device according to claim 1, characterized in that: The wind wheel is made of carbon fiber material and has a wind cap connected to the front end of the main shaft and a plurality of blades; The blade adopts an inner and outer double-layer structure, which is divided into an inner layer and an outer layer. The inner layer is made of foam plastic material, and the outer layer is made of carbon fiber material to wrap the inner layer. The root of the blade is connected to the hood via a rotatable angle adjustment mechanism, wherein the angle adjustment mechanism comprises a rotatable rotating disk embedded in the hood, the root of the blade is inserted into the rotating disk, and the rotating disk is connected to a driving motor; When the wind wheel rotates, the blade surface and the rotating surface of the wind wheel form a certain angle through the angle adjustment mechanism; The main shaft is a hollow main shaft with an inner cavity, and the power input end of the driving motor is led out through the inner cavity.

5. The permanent magnet semi-suspended wind power generation device according to claim 1, characterized in that: The gear teeth of the driving gear have a length greater than 1 cm and less than 3 cm, and the teeth of the planetary gear have a length greater than 3 mm and less than 6 mm.

6. The permanent magnet semi-suspended wind power generation device according to claim 1, characterized in that: The rear end of the gear teeth of the driving gear is tilted forward; The planetary gear is provided with a conical skirt, and the conical skirt is adapted to the inclination of the gear teeth of the driving gear; The conical skirt is rotatably connected to the rear of the planetary gear via a bearing.

7. The permanent magnet semi-suspended wind power generation device according to claim 6, characterized in that: The outer layer of the tapered skirt is a ceramic coating.

8. The permanent magnet semi-suspended wind power generation device according to claim 6, characterized in that: The bearing and the tapered skirt are connected via an elastic mechanism provided with a return spring, and two ends of the return spring are respectively connected to the bearing and the tapered skirt.

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