A front and back double-impeller beam shaft type fan

Abstract

The utility model discloses a front and rear double impeller beam axle formula fan, including tower, slewing bearing, lower platform, beam, front and rear blade, front and rear main shaft, front and rear first stage planetary speed increaser, common second stage differential bevel gear integration speed increaser, common third stage bevel gear speed increaser and generator, the beam is fixed hollow structure, as the force skeleton, front and rear wheel hub is supported on the beam through the bearing, realizes load transmission and main shaft decoupling, and front and rear main shaft connects front and rear first stage planetary speed increaser respectively, and will torque input to common second stage differential bevel gear integration speed increaser, the speed increaser casing is integral forming structure, and its inside integrated has differential mechanism and second stage bevel gear drive mechanism, realizes double blade speed self -adaptation adjustment and power confluence, and power is driven generator after the speed of common third stage bevel gear speed increaser, the utility model discloses compact structure, transmission is stable, has effectually promoted the wind energy utilization efficiency and operating reliability.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, specifically a wind turbine generator set that adopts a front and rear double blade layout, beam and shaft load-bearing division and integrated differential transmission structure. Background Technology

[0002] Traditional wind turbines typically employ a single-blade structure, resulting in limited wind energy capture area and low power generation efficiency, especially in low wind speed ranges. To improve power output, dual-blade turbines have emerged in existing technologies; however, these often utilize two independent drive systems, leading to structural redundancy, large space requirements, and a lack of effective speed coordination mechanisms. This can easily cause speed interference between the two blades, resulting in vibration and wear. Furthermore, the main shaft of traditional wind turbines simultaneously bears bending and torsional loads, leading to stress concentration, high alignment accuracy requirements, and short fatigue life. Therefore, there is an urgent need for a high-efficiency wind turbine with a compact structure, stable transmission, and the ability to effectively coordinate the operation of both blades. Utility Model Content

[0003] This utility model aims to provide a front and rear double impeller beam-shaft fan, which solves the problems of low wind capture efficiency, double blade interference, structural redundancy and load coupling in the prior art by using a load-bearing design of decoupled beam and shaft and a differential integrated transmission system.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a front and rear double impeller beam-shaft wind turbine, including a wind turbine tower, a slewing bearing, a short-section cylinder, a lower platform, a beam, a front main shaft, a beam-to-front hub connecting bearing, a front hub, front blades, a front-stage planetary speed increaser, a shared second-stage differential bevel gear integrated speed increaser, a shared third-stage bevel gear speed increaser, a generator, a front drum brake assembly, a beam-to-rear hub connecting bearing, a rear hub, rear blades, a rear-stage planetary speed increaser, a rear main shaft, and a differential and a rear drum brake assembly integrated in the shared second-stage differential bevel gear integrated speed increaser.

[0005] The lower platform is mounted on the wind turbine tower via a short cylindrical section and a slewing bearing. The beam is a hollow steel structure fixedly installed on the lower platform, serving as the main load-bearing frame of the entire turbine. The front hub is supported at the front end of the beam via a bearing connecting the beam to the front hub, and the rear hub is supported at the rear end of the beam via a bearing connecting the beam to the rear hub. Multiple front blades are mounted on the front hub, and multiple rear blades are mounted on the rear hub. All loads generated by the blades are transferred to the tower through the beam.

[0006] One end of the front main shaft is connected to the output end of the first-stage planetary speed increaser inside the front wheel hub, and the other end is connected to the front input port of the shared second-stage differential bevel gear integrated speed increaser. One end of the rear main shaft is connected to the output end of the second-stage planetary speed increaser inside the rear wheel hub, and the other end is connected to the rear input port of the shared second-stage differential bevel gear integrated speed increaser. The front and rear main shafts only transmit torque, achieving a decoupled design of "beam bearing load, shaft transmitting torque".

[0007] The housing of the shared two-stage differential bevel gear integrated speed increaser is a one-piece molded structure, which integrates the differential and the two-stage bevel gear transmission mechanism, sharing a common lubrication chamber. The differential can realize independent adjustment of the front and rear blade speeds and adaptive power convergence, avoiding mechanical interference.

[0008] The output end of the shared two-stage differential bevel gear integrated speed increaser is connected to the input end of the shared three-stage bevel gear speed increaser, and the output end of the shared three-stage bevel gear speed increaser is connected to the input shaft of the generator, thus completing the final speed increase and power transmission.

[0009] Furthermore, the preceding and following planetary speed increasers have the same structure and are integrated into the front and rear wheel hubs, respectively.

[0010] Furthermore, the front drum brake assembly is integrated inside the front wheel hub and works with the front wheel hub to perform braking; the rear drum brake assembly is integrated inside the rear wheel hub and works with the rear wheel hub to perform braking.

[0011] Furthermore, the beam is a box girder structure.

[0012] Compared with existing technologies, this invention offers the following advantages: It expands the swept area through a front and rear double-blade layout, enhancing low-wind-speed power generation and broadening the effective operating wind speed range. The integrated differential enables adaptive speed adjustment of the double blades, avoiding speed interference and reducing transmission system impact and failure rates. The integrated speed increaser design reduces the number of parts, saves nacelle space, reduces assembly complexity, and improves transmission accuracy. In this invention, the central beam is dedicated to load-bearing, while the main shaft only transmits torque, improving the stress state of key components and extending their service life. Furthermore, both front and rear wheel hubs integrate braking systems, allowing for independent or synchronous braking, enhancing operational safety and maintenance convenience. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a partially enlarged schematic diagram of the upper part of the wind turbine tower in this utility model.

[0016] Figure 3 This is a top view of the structure of this utility model.

[0017] In the diagram: 1 is the wind turbine tower, 2 is the slewing bearing, 3 is the short-section cylinder, 4 is the lower platform, 5 is the beam, 6 is the front main shaft, 7 is the bearing connecting the beam and the front hub, 8 is the front hub, 9 is the front blade, 10 is the first-stage planetary speed increaser, 11 is the shared second-stage differential bevel gear integrated speed increaser, 12 is the shared third-stage bevel gear speed increaser, 13 is the generator, 14 is the front drum brake assembly, 15 is the bearing connecting the beam and the rear hub, 16 is the rear hub, 17 is the rear blade, 18 is the second-stage planetary speed increaser, 19 is the rear main shaft, 20 is the differential, and 21 is the rear drum brake assembly. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments.

[0019] like Figure 1 , Figure 2 and Figure 3 As shown, the wind turbine of this invention is supported by a vertically installed wind turbine tower 1. A short cylindrical section 3 is connected to the top of the tower via a slewing bearing 2. A horizontal lower platform 4 is fixed to the upper end of the cylinder, forming a yaw system that can rotate 360°.

[0020] The beam 5, serving as the core load-bearing frame, is preferably a rectangular cross-section hollow box-shaped steel structure, with its length determined based on the rotor diameter and nacelle layout. The beam 5 is rigidly fixed to the upper surface of the lower platform 4 via supports welded or bolted to its bottom. During installation, it is essential to ensure that the beam's longitudinal axis is horizontal.

[0021] The front wheel hub 8 is supported by a bearing 7 connected to the front wheel hub via a beam and is mounted on the front cantilever end of the beam 5. This bearing is preferably a double-row tapered roller bearing or a combination bearing capable of simultaneously bearing radial and axial forces. The inner ring of the bearing is interference-fitted with or bolted to the bearing housing at the front end of the beam 5, while the outer ring of the bearing is fitted to the journal at the root of the front wheel hub 8. This connection method allows the front wheel hub 8 to rotate freely around the beam 5, but all the aerodynamic thrust, gravity, and gyroscopic torque it bears are transferred to the beam 5.

[0022] The rear wheel hub 16 is supported by the rear cantilever end of the beam 5 in exactly the same way by the rear wheel hub connecting bearing 15, forming a symmetrical layout.

[0023] The front main shaft 6 is a solid or hollow shaft, one end of which is rigidly connected to the output end of the preceding planetary speed increaser 10 via a flange or spline. The planetary speed increaser 10 is integrated inside the front hub 8, with its input end fixed to the hub body. The front main shaft 6 passes through a through hole at the front end of the beam 5, and its other end is connected to the front input shaft of the shared two-stage differential bevel gear integrated speed increaser 11 via a coupling. The rear main shaft 19 connects the following planetary speed increaser 18 to the rear input shaft of the speed increaser 11 in a mirror-symmetrical manner. The key point is that radial clearance is maintained between the front and rear main shafts 6 and 19 and the beam 5, or they are supported only by sliding bearings that do not bear bending moments, thus ensuring that the main shafts only transmit torque and do not bear bending loads.

[0024] The wind drives the front blades 9 to rotate, which in turn drives the front hub 8. The hub rotates at a relatively low speed, and its initial speed is increased by a first-stage planetary speed increaser 10 integrated within it. This planetary speed increaser, through the meshing of the sun gear, planet gears, and ring gear, raises the speed to a moderate range suitable for transmission by the main shaft. The planet carrier at the input end of the first-stage planetary speed increaser 10 is fixed to the inner wall of the front hub 8, and its output sun gear is connected to the front main shaft 6. The rear wind turbine's transmission path is symmetrical; the rear blades 17 drive the rear hub 16, and after being increased in speed by the second-stage planetary speed increaser 18, torque is output from the rear main shaft 19.

[0025] The front spindle 6 and the rear spindle 19 are respectively connected to the input ports on both sides of the housing of the shared two-stage differential bevel gear integrated speed increaser 11. The speed increaser housing is a one-piece structure made of integral casting or welding.

[0026] Inside the housing, two input shafts are connected to the two input ends of a differential 20. The differential 20 adopts a standard planetary gear structure, including a housing, two sun gear inputs, and a set of planetary gears.

[0027] Under constant speed conditions, when the front and rear wind speeds are the same, the input speeds of the front and rear main shafts are the same, the planetary gears of the differential 20 do not rotate, and the entire differential housing acts like a rigid coupling, merging the two power sources proportionally before outputting.

[0028] Under differential operation, when the difference in wind speed between the front and rear shafts causes the front main shaft 6 to rotate at a higher speed than the rear main shaft 19, the planetary gears within the differential 20 begin to rotate around their own axes. While continuing to transmit torque, this allows for a speed difference between the two input shafts. In this way, the front impeller's speed increase does not force the rear impeller to increase synchronously, avoiding rigid constraints and stress concentration within the transmission chain. The output end of the differential 20 is rigidly connected coaxially to the driving bevel gear of the second-stage bevel gear.

[0029] The combined power output from the differential housing 20 directly drives the driving bevel gear within the same chamber. The driving bevel gear meshes with the driven bevel gear, completing a 90° reversal of the power flow and performing a second acceleration. This stage of transmission is highly integrated with the differential and shares the same lubricating grease.

[0030] The driven bevel gear shaft of the second-stage bevel gear is connected to the input shaft of the common third-stage bevel gear speed increaser 12 via a spline or flange. The third-stage speed increaser 12 also uses a bevel gear pair internally, which reverses the power direction by 90° again, making it parallel to the original main shaft direction, and performs a third speed increase, ultimately reaching the rated speed required by the generator 13. The output shaft of this speed increaser 12 is directly connected to the drive shaft of the generator 13 via a flexible coupling.

[0031] The front drum brake assembly 14 is integrated inside the front wheel hub 8 and works with the front wheel hub 8 to perform braking; the rear drum brake assembly 21 is integrated inside the rear wheel hub 16 and works with the rear wheel hub 16 to perform braking.

[0032] The workflow of this utility model is as follows: 1. The wind drives the front and rear blades 9 and 17 to rotate.

[0033] 2. The aerodynamic load of the blades is transmitted to the bearings 7 and 15 through the hubs 8 and 16, and is entirely borne by the beam 5.

[0034] 3. After the wheel hub speed is increased by their respective first-stage planetary speed increasers 10 and 18, the pure torque is output by the front and rear main shafts 6 and 19.

[0035] 4. The two torque inputs share a common two-stage differential bevel gear integrated speed increaser 11. The differential 20 adaptively adjusts according to the real-time speed difference, balancing torque, allowing a reasonable speed difference, avoiding interference, and merging power.

[0036] 5. The combined power is commutated and accelerated by the second-stage bevel gear, and then commutated and accelerated by the third-stage bevel gear speed increaser 12 to drive the generator 13 to generate electricity.

[0037] 6. When the wind direction changes, the yaw system drives the entire nacelle to rotate around the tower to counter the wind. When braking is required, brake assemblies 14 and 21 act on wheel hubs 8 and 16 to achieve a rapid response.

[0038] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A front and rear double impeller beam shaft type fan, characterized in that, include: Wind turbine tower (1), slewing bearing (2), short section cylinder (3), lower platform (4), beam (5), front main shaft (6), beam and front hub connecting bearing (7), front hub (8), front blade (9), first-stage planetary speed increaser (10), common second-stage differential bevel gear integrated speed increaser (11), common third-stage bevel gear speed increaser (12), generator (13), front drum brake assembly (14), beam and rear hub connecting bearing (15), rear hub (16), rear blade (17), rear first-stage planetary speed increaser (18), rear main shaft (19), and differential (20) and rear drum brake assembly (21) integrated in the common second-stage differential bevel gear integrated speed increaser (11); The lower platform (4) is mounted on the wind turbine tower (1) via a short cylindrical section (3) and a slewing bearing (2), and the beam (5) is a hollow steel structure fixedly installed on the lower platform (4). The front wheel hub (8) is supported at the front end of the beam (5) by a beam and a front wheel hub connecting bearing (7), and the rear wheel hub (16) is supported at the rear end of the beam (5) by a beam and a rear wheel hub connecting bearing (15); a plurality of front blades (9) are disposed on the front wheel hub (8); a plurality of rear blades (17) are disposed on the rear wheel hub (16); One end of the front main shaft (6) is connected to the output end of the first-stage planetary speed increaser (10) inside the front hub (8), and the other end is connected to the front input port of the shared second-stage differential bevel gear integrated speed increaser (11). One end of the rear main shaft (19) is connected to the output end of the rear first-stage planetary speed increaser (18) inside the rear wheel hub (16), and the other end is connected to the rear input port of the shared second-stage differential bevel gear integrated speed increaser (11). The output end of the shared two-stage differential bevel gear integrated speed increaser (11) is connected to the input end of the shared three-stage bevel gear speed increaser (12), and the output end of the shared three-stage bevel gear speed increaser (12) is connected to the input shaft of the generator (13).

2. The front and rear double impeller beam shaft fan according to claim 1, characterized in that, The housing of the shared two-stage differential bevel gear integrated speed increaser (11) is an integrally formed structure, and the gear set of the differential (20) and the gear set of the two-stage bevel gear transmission mechanism are housed in the same housing.

3. The front and rear double impeller beam shaft fan according to claim 1, characterized in that, The first-stage planetary speed increaser (10) and the second-stage planetary speed increaser (18) have the same structure and are integrated into the front hub (8) and the rear hub (16) respectively.

4. The front and rear double impeller beam shaft fan according to claim 1, characterized in that, The front drum brake assembly (14) is integrated inside the front wheel hub (8) and works with the front wheel hub (8) to perform braking; the rear drum brake assembly (21) is integrated inside the rear wheel hub (16) and works with the rear wheel hub (16) to perform braking.

5. The front and rear double impeller beam shaft fan according to claim 1, characterized in that: The beam (5) is a box beam structure.

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