Lightweight direct-drive magnetic suspension vertical-axis wind turbine integrated with omnidirectional fan blades

Abstract

The utility model relates to the technical field of vertical axis wind driven generators, and discloses a lightweight direct-drive magnetic suspension vertical axis wind driven generator integrated with omnidirectional fan blades, which comprises a stand column, a motor main shaft, a lower end cover, a shell, an upper end cover, a fan blade connecting flange and the omnidirectional fan blades, wind energy in any direction is transmitted to the rotor part through the fan blades, the mass of the fan blades can be reduced through the pneumatic design of the omni-directional fan blades, axial friction of the wind power rotor is reduced, and therefore energy consumption is reduced, and the minimum working wind of a generator is reduced. The axial magnetic suspension bearing generates fixed suction force for offsetting gravity, so that suspension of the outer rotor of the generator is realized, axial friction-free transmission is realized, and the energy conversion efficiency is further improved; according to the utility model, stable axial suspension and higher power generation efficiency can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the vertical axis wind driven generator field more specifically relates to a kind of lightweight direct-drive magnetic suspension vertical axis wind driven generator of integrated omni-directional wind blade. BACKGROUND

[0002] As a clean and renewable energy, wind power generation technology has gradually become an important part of the energy strategy of each country. The principle of wind power generation is to capture wind energy by wind blade and convert it into mechanical energy, and then convert mechanical energy into electrical energy by generator. According to the difference of the direction of the rotating shaft of the wind blade, the wind driven generator is mainly divided into horizontal axis type and vertical axis type. Among them, the vertical axis wind driven generator shows higher energy conversion efficiency and more compact volume compared with the horizontal axis type due to its unique structural design, which makes it popular in small and medium-sized and micro wind power generation equipment field, and becomes the preferred solution in this field.

[0003] The deficiencies of the prior art: the traditional vertical axis wind driven generator usually adopts the layout of wind blade, transmission shaft, speed changer and generator in series. In the energy transmission process, the friction between the mechanical transmission components inevitably causes energy loss, which reduces the overall energy conversion efficiency. In order to alleviate this problem, the industry tries to introduce magnetic suspension technology to reduce mechanical transmission friction. But limited by the size and cost of the equipment, the magnetic suspension force in the generator is relatively small at present, which is difficult to effectively overcome the gravity to achieve stable magnetic suspension state, resulting in wear of wind blade and transmission components during operation, affecting the service life and power generation efficiency of the equipment. The existing vertical axis wind driven generator also has obvious limitations in operating environment. They usually need to be installed in areas with stable wind direction and high wind speed, because these devices are difficult to start and run stably under low wind speed conditions, and at the same time, additional braking system is needed to prevent equipment overload when wind speed is high, and alignment system is also needed to ensure that the blade is always perpendicular to the wind direction, which undoubtedly increases the complexity and maintenance cost of the equipment, limits its application and promotion in more complex environments. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above problem and provides a kind of lightweight direct-drive magnetic suspension vertical axis wind driven generator of integrated omni-directional wind blade, adopts direct-drive structure to reduce transmission link, and adopts magnetic suspension bearing to support to reduce friction and reduce energy loss.

[0005] The utility model discloses a kind of lightweight direct-drive magnetic suspension vertical axis wind turbine of integrated omni-directional wind blade, including stand, motor spindle, lower end cover, shell, upper end cover, fan blade connecting flange, omni-directional wind blade, the lower end of the stand is connected with ground, the upper end of the stand is connected with motor spindle;The bottom of the shell is equipped with lower end cover, and the top of shell is equipped with upper end cover, radial rolling bearing A is equipped between the lower end cover and motor spindle, radial rolling bearing A realizes radial support, two radial rolling bearings B are equipped between the upper end cover and motor spindle, and two radial rolling bearings B provide radial support and axial protection, prevent the impact of axial magnetic suspension bearing assembly caused by excessive axial load;The fan blade connecting flange is connected with upper end cover, and the omni-directional wind blade is connected with fan blade connecting flange by thread connection;Motor stator is assembled by interference fit, and motor rotor is assembled by interference fit in the shell, and the motor rotor is connected with motor stator;Axial magnetic suspension bearing assembly is assembled by interference fit by motor spindle, and thrust disc is connected in the shell by bolt, and the thrust disc is located between axial magnetic suspension bearing assembly, and is matched with axial magnetic suspension bearing assembly to offset gravity.Motor spindle is as the stator part of entire vertical axis magnetic suspension wind turbine, and lower end cover, shell, fan blade connecting flange are bolted to become a whole, and the whole is the rotor part of entire vertical axis magnetic suspension wind turbine.The rotation of omni-directional wind blade drives the rotation of stator part composed of lower end cover, shell and fan blade connecting flange, and the aerodynamic design of omni-directional wind blade can reduce the mass of wind blade, reduce axial friction, thereby reducing energy consumption.The rotation of shell can drive motor stator to generate current, and this direct-drive power generation mode reduces transmission link and reduces power generation loss.Axial magnetic suspension bearing assembly generates fixed suction force to thrust disc to offset gravity, thereby reducing friction, and further improving the efficiency of energy conversion.

[0006] Further, axial baffle ring is arranged between the motor stator and the motor spindle, and the axial baffle ring is used for axial positioning of the motor stator.

[0007] Further, rotary axial gap adjusting ring is arranged between the axial magnetic suspension bearing assembly and the motor spindle, and the rotary axial gap adjusting ring is used for adjusting the gap between the axial magnetic suspension bearing assembly and the thrust disc.

[0008] Further, upper bearing baffle ring is arranged on the top of the upper end cover, and the upper bearing baffle ring and the radial rolling bearing B jointly realize the axial protection function.

[0009] Further, the axial magnetic suspension bearing assembly comprises two axial magnetic suspension bearings, each of which comprises a permanent magnet and a coil winding, the permanent magnet generates a fixed permanent magnetic force on the thrust disc, and the coil winding generates a fixed electromagnetic force on the thrust disc, and the two forces together balance the gravity.

[0010] Further, the single-side axial air gap between the radial rolling bearing B and the upper end cover is d, and d is less than the single-side air gap s between the axial magnetic suspension bearing and the thrust disc, so as to provide protection for the axial thrust magnetic suspension bearing assembly.

[0011] The upper end cover is connected to the rotor part of the generator through bolts, so as to realize the axial suspension of the rotor part of the generator.

[0012] Further, the omnidirectional fan blade comprises an equilateral tetrahedron support, two blade As and two blade Bs, the blade A is formed by a plurality of channels, the inlet area of each channel is greater than the outlet area, a plurality of reinforcing ribs are arranged below the channel, and the structure of the blade A is arranged in mirror image symmetry with the structure of the blade B.

[0013] The channel is a curved surface, and the channels of the two blade As and the two blade Bs together form a geometric body rotating around a single axis, and the direction of each surface makes the channel push the omnidirectional fan blade to move in a predetermined rotation direction. By sequentially arranging the blade A and the blade B, pressure difference can be generated on the omnidirectional fan blade in any direction of wind, and the omnidirectional fan blade can adapt to any wind direction.

[0014] The omnidirectional fan blade converts the thrust force of fluid from any direction in the vertical, horizontal or diagonal plane into rotational motion around a single axis, can further reduce the weight of the fan blade, and improve the wind energy conversion efficiency; the rotor adopts an axial magnetic suspension structure, and there is no contact friction between the rotor and the stator, so that the friction resistance, energy loss and speed loss are reduced, the power generation device can be started at a low wind speed, and the energy conversion efficiency is high. The axial protection mechanism can ensure that the core components of the wind driven generator work stably during operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole structure schematic view of the magnetic suspension vertical shaft wind driven generator.

[0016] Figure 2 It is an internal section structure schematic view of the magnetic suspension vertical shaft wind driven generator.

[0017] Figure 3 It is a structure schematic view of the axial magnetic suspension bearing assembly.

[0018] Figure 4 It is a structure schematic view of the double-row radial rolling bearing in the utility model.

[0019] Figure 5 It is a structure schematic view of the omni-directional fan blade in the utility model.

[0020] Figure 6 It is a structure schematic view of the blade A in the utility model.

[0021] In the drawing: 1, stand; 2, motor main shaft; 3, lower end cover; 4, shell; 5, fan blade connecting flange; 6, omni-directional fan blade; 7, radial rolling bearing A; 8, motor stator; 9, motor rotor; 10, axial blocking ring; 11, axial magnetic suspension bearing assembly; 12, thrust disc; 13, rotating axial gap adjusting ring; 14, upper end cover; 15, radial rolling bearing B; 16, upper bearing blocking ring; 17, equal tetrahedron support; 18, blade A; 19, blade B. DETAILED DESCRIPTION

[0022] The specific implementation of the utility model will be described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0023] Referring to Figure 1 and Figure 2 The utility model relates to a kind of light-weight direct-drive magnetic suspension vertical axis wind turbine of integrated omni-directional fan blade, including stand 1, motor main shaft 2, lower end cover 3, shell 4, fan blade connecting flange 5, omni-directional fan blade 6, radial rolling bearing A 7, motor stator 8, motor rotor 9, axial blocking ring 10, axial magnetic suspension bearing assembly 11, thrust disc 12, rotating axial gap adjusting ring 13, upper end cover 14, radial rolling bearing B 15 and upper bearing blocking ring 16.The connection mode and function of each component are as follows:

[0024] The fixing and supporting structure of stator part: stand 1 is connected with ground base by high-strength bolt, for supporting the weight of entire device and providing structural stability, displacement will not occur in the device running process due to vibration or wind action.Motor main shaft 2 as the stator part of entire device, is connected with stand 1 by bolt.Motor main shaft 2 adopts high-strength alloy steel material, after precision machining and heat treatment, ensure its rigidity and durability under high load condition.

[0025] Integration and rotation of rotor part: the lower end cover 3, the shell 4 and the fan blade connection flange 5 are connected by high-precision bolts to form a whole, which constitutes the rotor part. The whole is precisely processed to ensure the coaxiality and concentricity between the parts, so as to reduce the unbalanced moment in the process of rotation. The omnidirectional fan blade 6 is connected with the fan blade connection flange 5 through threads. The omnidirectional fan blade 6 is made of lightweight composite material, and its aerodynamic design significantly reduces the blade mass and axial friction by optimizing the blade surface and channel structure, thereby reducing energy loss. The channel design of the blade is based on Bernoulli's principle, which generates a pressure difference through the area ratio of the inlet and outlet to achieve high-efficiency thrust conversion under the condition of slight wind.

[0026] Radial bearing and direct drive power generation structure: the lower end cover 3 is installed on the motor spindle 2 through radial rolling bearings A 7 to realize radial bearing. The radial rolling bearings A 7 adopt double-row deep groove ball bearings, which can bear larger radial load, and reduce friction loss through a lubrication system. The motor stator 8 is assembled to the motor spindle 2 by interference fit, and the motor rotor 9 is assembled to the shell 4 by interference fit. The axial retaining ring 10 is arranged between the motor stator 8 and the motor spindle 2 for axial positioning of the motor stator 8, and ensures the uniformity of the air gap between the motor stator 8 and the motor rotor 9. The rotation of the shell 4 directly drives the motor stator 8 to generate current, which adopts a direct drive power generation method to avoid energy loss and mechanical wear caused by traditional gear transmission.

[0027] Axial magnetic suspension and protection structure: the axial magnetic suspension bearing assembly 11 is assembled to the motor spindle 2 by interference fit, and the thrust disc 12 is installed on the shell 4 by bolt connection. The axial magnetic suspension bearing assembly 11 includes two axial magnetic suspension bearings, which adopt a composite design of permanent magnets and electromagnetic coils to balance the electromagnetic attraction and permanent magnet attraction, offset the gravity of the rotor part, realize non-contact support, significantly reduce friction loss, and the thrust disc 12 is located between the axial magnetic suspension bearing assembly 11. The rotating axial gap adjusting ring 13 is installed on the motor spindle 2 by thread connection, and the size of the air gap between the axial magnetic suspension bearing assembly 11 and the thrust disc 12 is accurately controlled by adjusting the length of the threaded screw, to ensure the stability and reliability of the magnetic suspension system. To prevent the impact of excessive axial load on the axial magnetic suspension bearing assembly 11, two radial rolling bearings B 15 are provided on the top of the motor spindle 2 to provide radial support and axial protection. The upper end cover 14 is assembled to the shell 4 by bolt connection and forms a whole with the fan blade connection flange 5. The upper bearing retaining ring 16 is assembled to the upper end cover 14 by bolt connection, and together with the two radial rolling bearings B 15 realizes the axial protection function to ensure the operation stability of the device under extreme working conditions.

[0028] Reference Figure 3The axial magnetic levitation bearing assembly 11 is installed on the motor shaft 2, and the axial magnetic levitation bearing adopts a composite design of permanent magnets and electromagnetic coils. The permanent magnets generate fixed permanent magnetic attraction to the thrust disc 12, and the electromagnetic coils generate adjustable electromagnetic attraction by accurately controlling the current, and the two balance the gravity of the rotor part. The single-sided air gap between the axial magnetic levitation bearing and the thrust disc 12 is s, which is dynamically adjusted by the rotating axial gap adjusting ring 13 to ensure the stability of the system under different working conditions. The permanent magnetic attraction bears most of the gravity, thereby reducing the number of turns and current demand of the electromagnetic coil, achieving the purpose of reducing the volume and power consumption of the magnetic levitation bearing. The electromagnetic coil adopts a high-efficiency heat dissipation design to ensure that it can still maintain stable attraction output under high load conditions.

[0029] With reference to Figure 4 The two radial rolling bearings B 15 installed on the motor shaft 2 provide radial support and axial protection for the upper end cover 14. The upper end cover 14 is connected to the rotor part of the generator through high-precision bolt connection, realizing the axial suspension of the rotor part. The single-sided axial air gap between the radial rolling bearing B 15 and the upper end cover 14 is d, which is smaller than the single-sided air gap s between the axial magnetic levitation bearing and the thrust disc 12, thereby providing mechanical backup protection when the magnetic suspension system fails or the load is too large, ensuring the safety and reliability of the device.

[0030] With reference to Figure 5 The omnidirectional fan blade 6 of the utility model can convert the thrust of fluid from any direction (vertical, horizontal or diagonal plane) into rotational motion around a single axis, and is particularly suitable for environments with unstable or multi-directional wind direction changes. The blades A 18 and the blades B 19 are based on channels, and the inlet of each channel is larger than the outlet, and the ratio can be varied. When a breeze flows through, the area difference between the inlet and the outlet generates a pressure difference, thereby generating thrust from the inlet to the outlet. The channel is curved, and the length is optimized according to fluid mechanics to maximize energy conversion efficiency. The inlet is exposed on one face of the device, forming a multi-directional fluid channel. The channels are grouped to form the faces of a geometric body, each face including one or more channels, forming one or more layers of channels. All the faces formed by the channels together form a geometric body that rotates around a single axis, and the orientation of each face is designed to make the channels push the device to move in a predetermined rotation direction. This design can effectively utilize horizontal, vertical and / or diagonal wind power, improve energy conversion efficiency, and reduce dependence on wind direction stability.

[0031] When the wind force acts on the omni-directional wind blade 6 of the wind driven generator, the blade is pushed by the wind force and rotates around the vertical shaft. The blade is connected with the fan blade connecting flange 5, and the rotation thereof transmits the mechanical energy to the motor rotor 9 in a direct drive mode. The generator part usually adopts the electromagnetic induction principle, and when the rotor rotates in the winding of the motor stator 8, the alternating electromotive force is generated by cutting the magnetic induction lines, so that the mechanical energy is converted into the electric energy. After the electric energy is processed by the rectification, inversion and other circuits, the stable alternating current or direct current can be outputted, and is used by the user or is connected to the power grid.

[0032] The above detailed description is used to further explain the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only the specific implementation of the utility model, and is not used to limit the utility model. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A lightweight direct-drive magnetic levitation vertical axis wind turbine integrated with omni-directional wind blades, characterized in that, The utility model provides a kind of omnidirectional fan, including stand (1), motor spindle (2), lower end cover (3), shell (4), upper end cover (14), fan blade connecting flange (5), all-directional fan blade (6);The lower end of the stand (1) is connected with ground, the upper end of the stand (1) is connected with motor spindle (2);The bottom of the shell (4) is equipped with lower end cover (3), and the top of the shell (4) is equipped with upper end cover (14), and radial rolling bearing A (7) is equipped between the lower end cover (3) and motor spindle (2), and two radial rolling bearing B (15) are equipped between the upper end cover (14) and motor spindle (2);The fan blade connecting flange (5) is connected with upper end cover (14), and the all-directional fan blade (6) is connected with fan blade connecting flange (5) by thread connection; The motor spindle (2) is assembled with motor stator (8) by interference fit, the shell (4) is assembled with motor rotor (9) by interference fit in, the motor rotor (9) is connected with motor stator (8);The motor spindle (2) is assembled with axial magnetic suspension bearing assembly (11) by interference fit, the shell (4) is connected with thrust disc (12) by bolt, and the thrust disc (12) is located between axial magnetic suspension bearing assembly (11), and axial magnetic suspension bearing assembly (11) is matched to offset gravity.

2. The integrated omni-directional wind blade's light-weight direct-drive magnetic levitation vertical axis wind turbine according to claim 1, characterized in that, The motor stator (8) is equipped with axial baffle ring (10) between motor spindle (2), and the axial baffle ring (10) is used for the axial positioning of motor stator (8).

3. The integrated omni-directional wind blade's light-weight direct-drive magnetic levitation vertical axis wind turbine according to claim 1, characterized in that, The axial magnetic suspension bearing assembly (11) is equipped with rotating axial gap adjusting ring (13) between motor spindle (2), and the rotating axial gap adjusting ring (13) is used for adjusting the gap between axial magnetic suspension bearing assembly (11) and thrust disc (12).

4. The integrated omni-directional wind blade light-weight direct-drive maglev vertical axis wind turbine according to claim 1, wherein, The top of the upper end cover (14) is equipped with upper bearing baffle ring (16), and the upper bearing baffle ring (16) realizes axial protection function with radial rolling bearing B (15).

5. The integrated omni-directional wind blade light-weight direct-drive maglev vertical axis wind turbine according to claim 1, wherein, The axial magnetic suspension bearing assembly (11) includes two axial magnetic suspension bearings, and the axial magnetic suspension bearing includes permanent magnet and coil winding, the permanent magnet generates fixed permanent magnetic attraction to thrust disc (12), the coil winding generates fixed electromagnetic attraction to thrust disc (12), and the two balance gravity.

6. The integrated omni-directional wind blade light-weight direct-drive maglev vertical axis wind turbine according to claim 5, characterized in that, The single-side axial air gap between radial rolling bearing B (15) and upper end cover (14) is d, and d is less than the single-side air gap s between axial magnetic suspension bearing and thrust disc (12).

7. The integrated omni-directional wind blade light-weight direct-drive maglev vertical axis wind turbine according to claim 1, wherein, The all-directional fan blade (6) includes equilateral tetrahedron support (17), two blade A (18) and two blade B (19), the blade A (18) is based on multiple channels, the inlet area of each channel is greater than the outlet area, multiple reinforcing ribs are arranged below the channel, and the structure of the blade A (18) is mirror-symmetrically arranged with the structure of the blade B (19).

8. The integrated omni-directional wind blade light-weight direct-drive maglev vertical axis wind turbine of claim 7, wherein, The channel is curved surface, and the channels of the two blade A (18) and the two blade B (19) form a geometric body rotating around a single axis, and the direction of each surface makes the channel push the all-directional fan blade (6) to move in the predetermined rotation direction.

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