CN104533708A - Gear mechanism based self-rotation blade impeller - Google Patents

Abstract

The invention relates to a self-rotating blade impeller based on a gear mechanism, which mainly consists of a rotating cross bracket, four blades, a central shaft, a base, a primary bevel gear, four secondary bevel gears, eight transmission gears and four transmission shafts composition.

Description

A self-rotating vane impeller based on a gear mechanism

technical field

The invention belongs to the technical field of wind power generation, and in particular relates to a self-rotating blade impeller based on a gear mechanism.

Background technique

Energy is the driving force and guarantee for the development and progress of human society. In recent years, with the rapid development of the global economy, conventional energy sources such as coal, oil, and natural gas have been consumed rapidly and in large quantities, which not only confronts human beings with the pressure of depletion of resources, but also is threatened by the continuous deterioration of the environment. Energy and environmental protection have become urgent problems that need to be solved urgently for human survival and development. As a clean and environmentally friendly new energy source, wind power neither consumes limited coal resources nor valuable underground wind resources, and is more conducive to the sustainable development of the national economy. In all regions of the country, we will vigorously develop high-efficiency wind power plants suitable for specific regional characteristics. Reliable wind power plants are promising. In order to realize the industrialization and practical application of wind power generation, high-efficiency wind turbine products are required to maximize the use of wind energy. This requires us to study the performance of wind turbines, improve the maximum capture of wind energy by wind turbines, and generate high-efficiency energy conversion.

At present, the main form of wind power generation is to convert wind energy into electrical energy through fan devices, so designing an efficient and reliable fan is a key technology for wind energy utilization. The shape of the fan should consider not only the structure but also other factors such as weight. At present, there are mainly two types of fan types: horizontal axis fan and vertical axis fan. The relative position of the impeller axis and the wind direction is parallel to the horizontal axis impeller (HAWT), and the relative position of the impeller axis and the wind direction is perpendicular to the vertical axis impeller ( VAWT).

Compared with horizontal axis wind turbines, vertical axis wind turbines have the following advantages:

(1) The axis of the vertical shaft impeller is perpendicular to the direction of incoming flow, which can capture wind energy in any direction. It has a simple structure and is very suitable for miniaturized independent power generation.

(2) The installation and maintenance of the vertical axis fan are simple, the manufacturing process is simple, the cost is low, and the economy is strong.

(3) The vertical axis fan has low requirements on the blade structure and its strength.

(4) The vertical shaft impeller can work effectively under complex turbulent flow, so it is more suitable for small wind power generation sites with complex terrain, such as rural areas in remote areas.

(5) The tip speed of the blades of the vertical axis impeller is smaller than that of the horizontal axis impeller, so that the aerodynamic noise is very small at low speed, and even the effect of silence can be achieved, which is beneficial to environmental protection.

At present, the common vertical axis impellers mainly include lift type vertical axis impeller and resistance type vertical axis impeller. The main representative of the lift type is the Darrieus impeller, and the main representative of the drag type is the Savonius impeller.

In the invention with publication number US1835018A, a Darrieus wind impeller is disclosed. The impeller has a simple structure and a high lift coefficient, but its starting performance is poor, and it is difficult to start especially at low wind speeds.

In the invention with the publication number US1766765A, a Savonius wind impeller is disclosed. The impeller has good starting performance and has a large range of wind speed utilization, but with the rotation of the rotor, its torque varies greatly from high to low, and even drops to near zero, so it has low overall efficiency .

Contents of the invention

technical problem to be solved

In order to overcome the problems of difficult self-starting of lift-type vertical-axis impellers and low energy capture efficiency of drag-type vertical-axis impellers in the prior art, and to further improve energy capture efficiency, the present invention proposes a self-rotating blade impeller based on a gear mechanism.

Technical solutions

A self-rotating blade impeller based on a gear mechanism, characterized in that it includes a rotating cross bracket, four blades, a central shaft, a base, a primary bevel gear, four secondary bevel gears, eight transmission gears and four transmission shafts; The central shaft is installed on the base, and the rotating cross frame is composed of an upper bracket and a lower bracket. Both the upper bracket and the lower bracket are in the shape of a cross. On the second boss, four blades are installed in the blade installation holes at the four ends of the upper bracket and the lower bracket through the blade installation shaft; two transmission shaft support frames are fixed on the upper surface of each arm of the upper bracket, and the transmission shaft supports There is a positioning hole on the frame for installing the transmission shaft; the second-stage bevel gear is coaxially fixed on the upper end of each blade installation shaft, the first-stage bevel gear is coaxially fixed on the top surface of the central shaft, and on the top of each transmission shaft A transmission gear is fixedly installed at both ends respectively.

The blades are rectangular thin plates.

The main shaft is cylindrical.

The positioning holes on the two transmission shaft support frames on the same support arm are coaxial.

The blade installation shaft is fixedly installed on the symmetrical axis of the two long sides of the blade, and is parallel to the central axis.

The gear ratio of the first-stage bevel gear to the second-stage bevel gear is 1:2.

Beneficial effect

The present invention proposes a self-rotating blade impeller based on a gear mechanism. While rotating around the axis, the blades of the impeller can also rotate regularly to change the position of the blades, which can increase the windward area of the blades and improve the The rotational torque received reduces the windward area and the headwind resistance when the wind is upwind, so that the fan impeller has better self-starting performance and higher power generation efficiency at the same time.

The blade has a larger projected area in the direction of the incoming flow in the half cycle of the downwind, which can obtain a higher rotational driving torque; while in the half cycle of the headwind, the angle between the blade and the direction of the incoming flow is small, and the resistance is small , which makes the device have high working efficiency. At the same time, because there is a large windward surface at any moment, the device has good self-starting performance.

Description of drawings

Fig. 1 isometric view of the present invention

Fig. 2 schematic diagram of gear transmission of the present invention

Figure 3 top view of the upper bracket

Figure 4 Simplified diagram of the working principle of the fan impeller

1-rotary cross bracket; 2-central shaft; 3-boss; 4-base; 5-blade; 6-transmission shaft; 7-transmission shaft support frame; 8-blade installation shaft; -secondary bevel gear; 11-transmission gear; 12-blade installation hole; 13-central shaft installation hole.

Detailed ways

Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

A self-rotating blade impeller device based on a gear mechanism, mainly composed of a rotating cross bracket 1, four blades 5, a central shaft 2, a base 4, a primary bevel gear 9, four secondary bevel gears 10, and eight transmission gears 11 And four transmission shafts 6 form.

The bottom of the central shaft 2 is fixedly connected to the base 4 , and a boss 3 is provided on the upper surface of the base 4 for supporting the cross bracket 1 . The length of the part of the central axis 2 above the boss 3 is slightly greater than the length of the blades 5 .

Rotary cross frame 1 is made up of upper support and lower support. As shown in Figure 3, the lower bracket is in the shape of a cross as a whole, and a central shaft installation hole 13 is provided in the center of the cross, the diameter of which is between the diameter of the central shaft and the diameter of the boss 3, for installing the central shaft 2 . Each of the four ends of the lower support cross has a blade installation hole 12 for installing the blade installation shaft 8 . The upper and lower brackets are identical.

The lower bracket is installed on the bottom of the central shaft 2, and is coaxially connected with the central shaft 2 through the central shaft mounting hole 13. Since the diameter of the central shaft mounting hole 13 is smaller than the diameter of the boss 3, the lower bracket can be placed on the boss 3 and can be wound around The central axis 2 rotates freely.

The upper bracket is installed on the top of the central shaft 2, and is coaxially connected with the central shaft 2 through the central shaft mounting hole 13. The corresponding arms of the upper and lower brackets are kept parallel to facilitate the installation of the blade installation shaft 8.

The blade 5 is a rectangular thin plate, and the blade installation shaft 8 is fixedly installed on the symmetrical axis of its two long sides. The upper and lower ends of the blade installation shaft 8 are respectively installed in the blade installation holes 12 of the upper support and the lower support through bearings, and are parallel to the central axis 2 .

On the upper surface of each arm of the upper bracket, two transmission shaft support frames 7 are fixed, and a positioning hole is arranged on the transmission shaft support frame 7 for installing the transmission shaft 6 . There is a certain distance between the two transmission shaft support frames 7 on each arm, and the positioning holes on the two are coaxial.

Transmission shaft 6 has identical 4, is cylindrical, and its diameter is slightly smaller than the positioning hole diameter on the transmission shaft 6. 4 transmission shafts 6 are respectively installed on each arm of the upper bracket, and pass through positioning holes on the transmission shaft support frame 7 .

The two-stage bevel gear 10 is fixedly mounted on the upper end of each blade installation shaft 8 coaxially, and can rotate together with the blade installation shaft 8 . The first-stage bevel gear 9 is coaxially and fixedly installed on the top end surface of the central shaft 2 . A transmission gear 11 is respectively fixedly installed at both ends of each transmission shaft 6, and the transmission shaft 6 relies on these two transmission gears 11 to connect the primary bevel gear 9 and the secondary bevel gear 10 through bevel gears. The gear ratio of the primary bevel gear 9 and the secondary bevel gear 10 is 1:2.

As shown in FIG. 4 , under the action of wind force, the blades 5 drive the rotating cross 1 to rotate counterclockwise and drive the four blades 5 to revolve around the central axis 2 . The primary bevel gear 9 is fixedly connected with the central shaft 2, and under the action of the rotating cross 1, the transmission gear 11 meshing with the primary bevel gear 9 also rotates counterclockwise. At the same time, the rotary motion is transmitted to the secondary bevel gear 10 through the transmission shaft 6 and makes the secondary bevel gear 10 rotate clockwise around the axis of the blade installation shaft 8 . In this movement mode, the blade 5 can rotate around the axis of the blade installation shaft 8 . Since the gear ratio of the primary bevel gear 9 and the secondary bevel gear 10 is 1:2, the ratio of the revolution angular velocity to the rotation angular velocity of the blade 5 is 2:1. When the blade 5 revolves 90° counterclockwise around the rotating cross 1 , it simultaneously rotates 45° clockwise around the axis of the blade mounting shaft 8 . The advantage of this blade movement method is that during the one revolution of the blade, the impeller is driven by the lift force in the area near points A and C; in the area near point B, the projected area of the blade in the incoming flow direction is the largest, driven by the drag effect The impeller; and in the area near point D, the blade has the smallest windward area and the smallest resistance, which makes the device have a higher working efficiency. At the same time, because there is a large windward surface at any moment, the device has good self-starting performance.

Claims (6)

1. A self-rotating vane impeller based on a gear mechanism, characterized in that it comprises a rotating cross bracket (1), four blades (5), a central shaft (2), a base (4), a bevel gear (9), Four secondary bevel gears (10), eight transmission gears (11) and four transmission shafts (6); the center shaft (2) is installed on the base (4), and the rotating cross frame (1) consists of an upper bracket and The lower bracket consists of the upper bracket and the lower bracket, both of which are in the shape of a cross, respectively set under the first boss (15) and the second boss (16) of the central shaft (2) through the center shaft mounting holes (13) of the respective centers. On the top, the four blades (5) are installed in the blade installation holes (12) at the four ends of the upper bracket and the lower bracket through the blade installation shafts (8); two transmission shafts are fixed on the upper surface of each arm of the upper bracket There is a positioning hole on the support frame (7), and the drive shaft support frame (7) is used to install the drive shaft (6); the secondary bevel gear (10) is coaxially fixed on the upper end of each blade installation shaft (8), The first-stage bevel gear (9) is coaxially fixedly installed on the top end surface of the central shaft (2), and a transmission gear (11) is fixedly installed at both ends of each transmission shaft (6). 2. The self-rotating blade impeller based on a gear mechanism according to claim 1, characterized in that the blade (5) is a rectangular thin plate. 3. The self-rotating vane impeller based on a gear mechanism according to claim 1, characterized in that said main shaft (8) is cylindrical. 4. The self-rotating vane impeller based on gear mechanism according to claim 1, characterized in that the positioning holes on the two transmission shaft support frames (7) on the same support arm are coaxial. 5. The self-rotating blade impeller based on gear mechanism according to claim 1, characterized in that the blade installation shaft (8) is fixedly installed on the symmetrical axis of the two long sides of the blade, and is connected with the central axis (2 )parallel. 6. The self-rotating vane impeller based on a gear mechanism according to claim 1, characterized in that the gear ratio of the first-stage bevel gear (9) to the second-stage bevel gear (10) is 1:2.