TWI400388B - Horizontal axis of the wind turbine generator automatically variable pitch angle of the body - Google Patents

Description

Horizontal axis wind turbine blade automatic variable pitch angle mechanism

The invention provides a technical field of a horizontal axis wind turbine, in particular to a mechanism for automatically changing a pitch angle of a horizontal axis wind turbine blade. The centrifugal force is limited by the two fixed connecting rods, and the result is a The turning moment changes the blade pitch angle, making it easy to start at low wind speeds and high energy efficiency at high wind speeds.

Conventional wind turbines, which lock the designed blades directly on the hub, so that no matter how the blades are fixed, the blades are designed to be very important, so that the wind can be made The generator can start at low wind speeds and has a higher power coefficient (Cp, power coefficient) below the high wind speed. However, it is difficult to start with a low wind speed at a fixed pitch angle and a high power factor under high wind speed, or the installation cost is too high, so that the conventional wind turbine can only be between efficiency and cost. Find a balance point.

Therefore, in view of the problems existing in the above-mentioned conventional structure, how to develop an innovative structure that is more ideal and practical, the consumers are eagerly awaiting, and the relevant industry must strive to develop the goal and direction of breakthrough.

In view of this, the inventor has been engaged in the manufacturing development and design experience of related products for many years. After detailed design and careful evaluation, the inventor has finally obtained the practical invention.

Conventional small wind turbines, which lock the blades with fixed pitch angles directly on the hub, so the pitch angle is fixed regardless of how the blades are rotated, so that the blades are designed to start at low wind speeds. At the same time, there is a high power factor under high wind speed, which is obviously very difficult; if it is to be achieved by a complex mechanism such as a large wind turbine, it has a lack of high installation cost.

The invention provides a mechanism for automatically changing a pitch angle of a horizontal axis wind turbine blade, comprising: a hub, at least three fixed pitch angle blades respectively fixed to a blade root fixing plate, wherein the blade root fixing plate and the hub rotate by a blade The central shaft is connected to fix the central axis of rotation of the blade and the fixed plate of the blade root, and the array of ears are respectively fixed to the two sides of the boss convex portion and the blade root fixing plate, and the number of connecting rod wires is Tilting the two sides of the same side with an angle of 15 to 25 degrees, and blocking the connecting wire with the locking screw, so that the blade root fixing plate and the boss convex portion have an inclination angle of 6 to 10 degrees, whereby the blade The centrifugal force generated during the rotation causes the blade to be rotated by the rotation of the central axis of the blade due to the limitation of the two fixed links, so that the blades have different pitch angles at different rotational speeds.

The mechanism for automatically changing the pitch angle of the horizontal axis wind turbine blade of the present invention locks the ear piece on the blade root fixing plate and the hub respectively, and then places the connecting rod wire on the ear piece to be screwed. The invention separates the blade from the hub, and fixes the rotating shaft with the central axis of the blade rotation in the middle, and the two sides are fixed by the connecting wire. When the wind turbine rotates, the blades will have a rotational speed and a centrifugal force will move outward. Because the initial design blade root fixing plate has an angular difference from the hub, when the centrifugal force is applied, the mechanism moves away from the hub, but at the same time, a central rotating shaft exists between the mechanism and the hub, and is limited. The connecting rod wire fixed on the two sides will produce a turning moment. When the mechanism is away from the hub, the rotation will occur, that is, the angle difference between the two faces connected by the connecting rod will become smaller. In this way, it is equivalent to making the pitch angles of the blades different at different rotational speeds.

The above-mentioned objects, structures and features of the present invention will be described in detail with reference to the preferred embodiments of the present invention. .

Referring to the first to fourth figures, the present invention provides a mechanism for automatically changing the pitch angle of a horizontal axis wind turbine blade, comprising: a hub (10), the hub (10) is equally divided according to the installation position. a plurality of hub projections (11); at least three blade assemblies (20), each of the blade assemblies (20) having a fixed pitch angle of a blade (21) fixed to a blade root by a fixed structure (22) On the plate (23), the blade root fixing plate (23) and the hub (10) are connected by a blade rotation central axis (24); the array ears (30) are respectively fixed or integrally formed to the hub convex portion ( 11) two sides (111), (112) and two sides (231), (232) of the blade root fixing plate (23), each of the ears (30) is provided with a recessed hole (31); Connecting rod wire (40), each of the connecting rod wires (40) is inclined at an angle of 15 to 25 degrees to hook the concave hole (31) of the two ears (30) on the same side, and lock two screws (41) And (42) blocking the link wire (40) from falling off, and causing the blade root fixing plate (23) to have an inclination angle of 6 to 10 degrees with the hub convex portion (11).

The mechanism for automatically changing the pitch angle of the horizontal axis wind turbine blade of the present invention, wherein the blade root fixing plate (23) and the hub (10) respectively lock the ear piece (30), and then the number of connecting rod wires ( 40) Place on the ear piece (30) and press the fixed screw (41), (42) to press the limit. The invention separates the blade (21) from the hub (10), and pivots the blade (21) and the hub (10) respectively with the blade rotation central axis (24), and the two sides are fixed by the connecting wire (40). When the wind turbine rotates, the blades (21) will have a rotational speed and a centrifugal force will move outward. Since the initial design blade root fixing plate (23) has an angular difference from the hub (10), the mechanism of the automatic pitch angle on the blade (21) will be directed away from the hub when subjected to the centrifugal force. The direction of movement, but at the same time there is a blade rotation central axis (24) between the mechanism of the automatic pitch angle and the hub (10), and is limited by the fixed-side connecting wire (40) on both sides, resulting in a rotation The moment when the mechanism of the automatic pitch angle is away from the hub (10), the two sides (111), (112), (231), (232) connected by the connecting wire (40) are generated. The angle difference will be smaller. In this way, it is equivalent to making the pitch angles of the blades (21) different at different rotational speeds.

The fixing structure (22) includes three perforations (211) in the blade (21), and the blade root fixing plate (23) is provided with a corresponding three screw holes (233) through which the three screws (25) pass. (211) and locked to the three screw holes (233) fixed.

According to the above, the mechanism for automatically changing the pitch angle of the horizontal axis wind turbine blade of the present invention has the main structure of designing an automatic variable pitch angle mechanism connecting the blade (21) and the hub (10), so that the blade is driven at different rotation speeds. The pitch angle of (21) has different angles. It is hoped that the wind turbine blades can be started at a low wind speed because of a small angle of attack, and at the same time have a high power coefficient (Cp, under high wind speed). Power coefficient).

The present invention has been described with reference to the preferred embodiments of the present invention. However, those skilled in the art can change and modify the present invention without departing from the spirit and scope of the invention. Such changes and modifications shall be covered in the scope defined by the following patent application.

(10). . . Wheel hub

(11). . . Hub projection

(111) (112). . . side

(20). . . Blade assembly

(twenty one). . . blade

(211). . . perforation

(twenty two). . . Fixed structure

(twenty three). . . Blade root fixing plate

(231) (232). . . side

(233). . . Screw hole

(twenty four). . . Blade rotation center axis

(25). . . Screw

(30). . . Ear piece

(31). . . Concave hole

(40). . . Connecting rod wire

(41) (42). . . Screw

The first figure is a partial exploded perspective view of an embodiment of the present invention.

Second Figure: A perspective view of an embodiment of the present invention.

Third Embodiment: A partial perspective view of an embodiment of the present invention.

Fourth Figure: A schematic diagram of the operation of an embodiment of the present invention.

(10). . . Wheel hub

(11). . . Hub projection

(111) (112). . . side

(20). . . Blade assembly

(twenty one). . . blade

(211). . . perforation

(twenty two). . . Fixed structure

(twenty three). . . Blade root fixing plate

(231) (232). . . side

(233). . . Screw hole

(twenty four). . . Blade rotation center axis

(25). . . Screw

(30). . . Ear piece

(31). . . Concave hole

(40). . . Connecting rod wire

(41) (42). . . Screw

Claims (4)

A mechanism for automatically changing a pitch angle of a horizontal axis wind turbine blade comprises: a hub having a plurality of equally protruding wheel hub protrusions according to the installation position; at least three blade assemblies, each of the blade assemblies being provided a blade having a fixed pitch angle is fixed to a blade root fixing plate by a fixed structure, the blade root fixing plate and the hub convex portion are connected by a blade rotation central axis; and the array ear pieces are respectively fixed to the hub convex portion Two sides and two sides of the blade root fixing plate, each ear piece is provided with a concave hole; and, a plurality of connecting rod wires, each of which is inclined at an angle of 15 to 25 degrees to hook the same side of the two ears The recessed hole and the locking two screws block the connecting wire from falling off, and the blade root fixing plate and the boss convex portion have an inclination angle of 6 to 10 degrees, so that the blade is attacked at different wind speeds. The angles have different angles. The mechanism for automatically changing the pitch angle of the horizontal axis wind turbine blade according to claim 1, wherein the fixing structure comprises three perforations in the blade, and the blade root fixing plate is provided with a corresponding three screw holes, and the three screws are worn. The three screw holes are fixed to the three screw holes. A mechanism for automatically changing a pitch angle of a horizontal axis wind turbine blade comprises: a hub having a plurality of equally protruding wheel hub protrusions according to the installation position; at least three blade assemblies, each of the blade assemblies being provided a blade having a fixed pitch angle is fixed to a blade root fixing plate by a fixed structure, and the blade root fixing plate and the hub convex portion are connected by a blade rotation central axis; the array ears are integrally formed to the hub convex portion Two sides and two sides of the blade root fixing plate, each ear piece is provided with a concave hole; and, a plurality of connecting wire wires, each of which is inclined at an angle of 15 to 25 degrees to hook the same side of the two ears The recessed hole of the piece, and the two screws are locked to block the wire of the connecting rod from falling off, and the blade root fixing plate and the boss convex portion are inclined at an angle of 6 to 10 degrees, so that the blade is at different wind speeds. The angle of attack has a different angle. The mechanism for automatically changing the pitch angle of the horizontal axis wind turbine blade according to claim 3, wherein the fixing structure comprises three perforations in the blade, and the blade root fixing plate is provided with a corresponding three screw holes, and the three screws are worn. The three screw holes are fixed to the three screw holes.