CN201141337Y - Speed regulating device for small wind power generator - Google Patents

Abstract

The utility model relates to a speed regulating device of a small wind power generator with variable pitch. The blade is installed on the blade seat, and the fixed seat with the shield is fixedly assembled on the drive shaft of the generator. The characteristics are: the fixed seat is composed of an assembly base and a slide base, and a guide keyway, and sleeved with a sliding sleeve, the guide key fixedly assembled on the sliding sleeve is correspondingly assembled in the guide keyway, and can move axially in the guide keyway, and a stop sleeve is set at the end of the slide sleeve. Assembled on the base of the sliding seat, a compression spring is installed between the sliding sleeve and the stop sleeve, the paddle seat is assembled on the sliding sleeve through a rotating shaft, and can rotate around the rotating shaft, and a driving lever is fastened on the fixed seat, and the The driving rod is assembled in the guide groove on the paddle seat, and the guide groove can slide along the driving rod. The utility model has good versatility, reasonable structure, convenient processing and reliable use, realizes the unattended operation of the small wind power generator, and is suitable for use in areas with variable wind speeds.

Description

Speed regulating device for small wind power generator

technical field

The utility model relates to the control of wind power generators, in particular to a speed regulating device of a small wind power generator capable of realizing pitch changes.

Background technique

A small wind turbine is a device that uses wind energy to drive a wind wheel to drive a generator to generate electricity, which effectively solves the problem of power supply in areas without electricity. This small wind power generator is mainly composed of a blade, a blade seat, a fixed seat, and a generator. The blade is fixed on the fixed seat through the blade seat. A shield is installed at the end, a tail rudder stock is fixedly connected to the tail of the generator, and a wind rudder plate is fixedly connected to the end of the tail rudder stock. At present, during the use of small wind turbines, due to the erratic wind speed and direction in nature, there is a common phenomenon of "look forward to wind when there is no wind, and fear strong wind when there is wind". In order to ensure the reliability of the operation of small wind turbines, avoid damage to the generator due to overload operation, and prevent the output voltage of the generator from burning out other auxiliary components, all small wind turbines are equipped with a speed regulating mechanism. For example, the speed regulation of small wind turbines adopts the tail rudder yaw-to-wind technology. Its working principle is to tie a rope to the tail rudder pole and drag it manually to make the wind turbine speed regulation by side wind. The disadvantage of this speed regulation method is that it is troublesome to manually adjust the speed, and it has limited effect on the speed regulation of gusts with uncertain wind directions, and cannot meet the requirements of unattended operation. In addition, during the speed regulation process, manual operation will cause a sudden strong gust of wind, which will cause it to be too late to manually drag the sidewind speed regulation, causing the wind turbine to stall at speed, resulting in damage or burnout of the entire system of the wind turbine. Another example is the "Adaptive Speed Control Device for Windshield Type Small Wind Power Generator" disclosed in the Chinese utility model patent specification CN2448941Y announced on September 19, 2001, which consists of a sleeve body, a bearing, a slideway, a motor, Composed of a spring and a shell, the bearings are arranged in the slideways on both sides of the shell and connected with the shell, one end of the spring is connected with the casing, the other end is connected and fixed with the motor, and the motor is arranged in the shell. The working principle of the self-adaptive speed regulating device is: according to the law that the wind strength of different sections in the wind cover decreases rapidly, when the wind speed exceeds the rated value, the device pulls the displacement of the motor and the wind wheel, so that the wind wheel is in a proper position, limiting the wind speed. The increase of the rotating speed eliminates the danger of strong wind speeding, but the structure of the downwind wind turbine, the tower shadow effect will reduce the performance of the wind turbine, and at the same time, the increased windshield also greatly affects the safety of the wind turbine running in strong winds sex. For another example, "a pitch-variable speed-regulating device for wind-driven generators" disclosed in the Chinese utility model patent specification CN2401705Y announced on October 18, 2000, the disclosed pitch-variable speed-regulating device includes a On the turntable where the leaf-connected speed-regulating shaft rotates and outputs power, the disc is equipped with a deflection limit block, a truncated cone spring with a seat, and front and rear bearing seats for installing the adjusting shaft. On the speed-regulating shaft between the two bearing seats, A lever with one end connected to the force regulating member fixed on the flat plate on the top surface of the spring, and the other end leaning against the limit block. When the wind force exceeds the operating rated value of the unit, the blade with the speed-regulating shaft and the lever deflect so that the force-regulating member pulls the flat plate to deform the spring, and the pitch is automatically changed to keep the unit running normally and the quality of power supply is impaired. However, the variable pitch speed regulating device of the wind turbine with the above structure has many components, and the windward area of the blades at the extreme position is too large, which will also affect the increase of the safe wind speed of the wind turbine, resulting in the resistance of the wind turbine. Reduced wind capacity.

Contents of the invention

In order to solve the problem that the speed regulating device of the existing wind power generator cannot safely guarantee the normal operation of the unit when the wind speed exceeds the rated wind speed, the utility model provides a speed regulating device for a small wind power generator, the speed regulating device of the small wind power generator The device can not only ensure the safe, reliable and efficient operation of the unit, but also ensure that in strong winds (25m/s-20m/s), the speed of the wind rotor does not exceed the normal generator specified in GB10760.1-89 Technical Conditions for Small Wind Turbine Generators Maximum operating speed.

The technical scheme adopted by the utility model to solve the technical problem is: a speed regulating device of a wind-driven generator, comprising a blade, a blade seat, a fixed seat and a drive shaft of a generator, and the blade is fixedly installed on the blade seat, The fixed seat is fixedly assembled on the drive shaft of the generator, and a shield is installed at the assembly end of the fixed seat. The base body is composed of a guide keyway on the slide base of the fixed seat. A sliding sleeve is set on the slide base of the fixed base. Move axially in the guide keyway, and set a retaining sleeve at the end of the sliding sleeve. The retaining sleeve is assembled on the sliding seat base of the fixed seat with a connecting piece, and a compression spring is installed between the sliding sleeve and the retaining sleeve. The paddle seat described above is assembled on the sliding sleeve through a rotating shaft, and can rotate around the rotating shaft. A driving lever is fastened on the fixed seat, and the driving rod is assembled in the guide groove on the blade seat. The guide groove can slide along the lever.

The guide groove arranged on the paddle seat and matched with the driving lever is herringbone.

A rolling sleeve is set on the driving rod assembled in the guide groove of the paddle seat, and the rolling sleeve is fixed and limited by a retaining ring matched with the driving rod.

The utility model has good versatility, and the existing installed small-scale wind generator (international motor) with the tail rudder facing the wind only needs to dismantle the original wind wheel, and can be replaced without modification or simple modification; the structure is reasonable and can be used Multi-blade design, convenient processing, good rigidity, increased reliability and safety of use, and improved annual energy output of the wind turbine generator. If it is matched with a battery charge controller, it can be realized when the wind speed is not greater than 25m/s At the same time, the utility model responds quickly to gusts and moves accurately, and is suitable for use in areas with variable wind speeds.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is an assembly view of the utility model.

Fig. 2 is a sectional view along line C-C in Fig. 1 .

Fig. 3 is a top view of Fig. 1, which is also a working state diagram of the utility model when the wind speed is less than or equal to the rated wind speed.

Fig. 4 is a working state diagram of the utility model when the strong wind presses the blade and the pitch angle is maximized.

Marks in the figure: 1. Blade, 2. Blade seat, 3. Fixed seat, 4. Generator drive shaft, 5. Shield, 6. Assembly base, 7. Slide base, 8. Sliding sleeve, 9. Block sleeve, 10. compression spring, 11. guide keyway, 12. guide key, 13. rotating shaft, 14. driving lever, 15. guide groove, 16. rolling sleeve, 17. retaining ring.

Detailed ways

In Fig. 1, a speed regulating device of a wind-driven generator includes a blade (1), a blade seat (2), a fixed seat (3) and a drive shaft (4) of the generator. The fixed seat (3) is fixedly assembled on the drive shaft (4) of the generator, and a shield (5) is installed at the assembly end of the fixed seat (3).

As shown in Fig. 1 and Fig. 2, what the blade (1) adopted is three blades, which are fixedly installed on the blade seat (2) through connecting screws respectively.

As shown in Fig. 1, the fixed base (3) is composed of an assembly base (6) and a slide base (7) integrally provided with the assembly base (6). The shield (5) is installed on the end of the assembly base (6) via fixing screws.

In Fig. 1, a guide keyway (11) is provided on the sliding seat base (7) of the fixed seat (3), and a sliding sleeve (8) is sleeved on the sliding seat base (7) of the fixed seat (3).

In Fig. 1 and Fig. 2, the guide key (12) is fixedly installed on the sliding sleeve (8), and the guide key (12) is correspondingly assembled in the guide key groove (11) of the base body (7) of the sliding seat, and can be inserted into the guide key groove (11) Inner axial movement. Therefore, the sliding sleeve (8) is limited by the guide key (12), and can only move axially with the sliding seat base (7) of the fixed seat, and the two cannot do relative rotation.

In Fig. 1, a retaining sleeve (9) is also provided at the end of the sliding sleeve (8), and the retaining sleeve (9) is fixedly installed on the end of the sliding seat base (7) of the fixed seat with a connecting screw. A compression spring (10) is assembled between the sleeve (8) and the retaining sleeve (9).

As shown in Fig. 2 and Fig. 3, the paddle seat (2) is assembled on the sliding sleeve (8) through a rotating shaft (13), and can rotate around the rotating shaft (13). This rotating shaft (13) is that one end is provided with connecting thread, and the other end is provided with limit shoulder, and the connecting thread end of rotating shaft (13) is threadedly connected with sliding sleeve (8), and the limit shoulder limits the shaft of paddle seat (2). Move forward.

Among Fig. 2, for the convenience of assembling, the guide key (12) fixedly assembled on the sliding sleeve (8) is to be assembled on the connecting threaded end of the rotating shaft (13) through a counterbore screw.

In addition, it should be noted that since the blades (1) of the present utility model adopt three blades, the blade holders (2) are also three, and the three blade holders (2) are assembled on the slide at an interval of 120° from each other. on the sleeve (8) (not shown in the figure).

As shown in Fig. 1, Fig. 3 and Fig. 4, fasten a driving rod (14) on the fixed seat (3), and the driving rod (14) is assembled in the guide groove (15) on the blade seat (2) Inside, the guide groove (15) is herringbone and can slide along the driving rod (14).

In Fig. 1, in order to reduce friction, a rolling sleeve (16) is set on the driving rod (14) assembled in the guide groove of the blade seat, and the rolling sleeve (16) is composed of a retaining ring matched with the driving rod (14) (17) fixed limit.

When the natural wind speed was lower than the rated wind speed, the positive pressure on the blade surface of the utility model did not reach the compression force of the compression spring, and the compression spring was not deformed. As shown in Figure 3, the speed regulating device of the utility model does not work.

When the strong wind passes through the blade (1), the positive pressure on the blade surface exceeds the design requirements, as shown in Figure 4, the blade (1) pushes the sliding sleeve through the blade seat (2) installed at the root of the blade (8) Compress the pressure spring to move backward, and at the same time, the guide groove (15) on the paddle seat (2) slides on the shift rod (14), and the paddle seat (2) shifts around the rotating shaft (13), increasing the dial The center distance between the rod (14) and the rotating shaft (13). That is, the side length AO (see Figure 3) in the right triangle ABO is increased to A'O' (see Figure 4), and the installation angle of the blade is correspondingly increased from the initial state α to α', and the purpose of pitch change is achieved.

When the wind speed drops and the force on the blade decreases, the sliding sleeve returns to its position under the push of the pressure spring, and the blade returns to the initial installation angle.

The herringbone design of the guide groove (15) on the blade seat (2) can make the change of the α angle have such a process: when the wind speed is between the rated wind speed and the set wind speed (such as 20m/s), the α' angle increases Slowly, to ensure that the generator does not exceed the maximum speed. When the wind speed exceeds the set wind speed, the α' angle increases rapidly, the force on the blade decreases rapidly, the rotation resistance of the wind wheel increases, and the speed decreases.

The utility model can meet different requirements when designing the wind wheel through the adjustment of the working pressure of the compression spring and the revision of the parameters of the guide groove on the paddle seat.

Applying the speed regulating device of the utility model to a 500W small-sized wind-driven generator, experiments have proved that in a strong wind with a wind force of 7-8 and a gust of 9, the wind wheel runs smoothly and reliably, and the generator works normally.

It should be pointed out that the above are all technical solutions of the utility model, and any changes or expansions of the utility model that do not exceed its functional effects shall belong to the protection scope of the utility model.

Claims (3)

1. A speed regulating device for a wind-driven generator, comprising a blade, a blade seat, a fixed seat and a drive shaft of a generator, the blade is fixedly mounted on the blade seat, and the fixed seat is fixedly assembled on the drive shaft of the generator , and a shield is installed at the assembly end of the fixed seat, which is characterized in that: the fixed seat is composed of an assembly base and a sliding base integrally arranged with the assembly base, on the sliding base of the fixed base There is a guide keyway, the sliding base of the fixed seat is covered with a sliding sleeve, and the guide key fixedly assembled on the sliding sleeve is correspondingly assembled in the guiding keyway of the sliding base base, and can move axially in the guiding keyway. A retaining sleeve is also provided at the end of the sleeve, and the retaining sleeve is assembled on the sliding seat base of the fixed seat with a connecting piece, and a compression spring is installed between the sliding sleeve and the retaining sleeve, and the blade seat is assembled on the sliding seat through a rotating shaft. Put it on, and can rotate around the rotating shaft, fasten a driving rod on the fixed seat, and the driving rod is assembled in the guide groove on the blade seat, and the guide groove on the blade seat can slide along the driving rod. 2. A speed regulating device for a wind power generator according to claim 1, characterized in that: the guide groove provided on the blade seat and matched with the driving rod is in the shape of a herringbone. 3. A speed regulating device for a wind power generator according to claim 1 or 2, characterized in that a rolling sleeve is fitted on the shift lever assembled in the guide groove of the blade seat, and the rolling sleeve is composed of a The retaining ring matched with the lever fixes the limit.

Images