WO2016023529A1

WO2016023529A1 - Wind engine

Info

Publication number: WO2016023529A1
Application number: PCT/CZ2015/000091
Authority: WO
Inventors: Petr FALTA; Petro FISENKO
Original assignee: Vp Delta S.R.O.
Priority date: 2014-08-13
Filing date: 2015-08-12
Publication date: 2016-02-18
Also published as: CZ28023U1

Abstract

Wind engine with vertical axis of rotor rotation and curved rotor blades, wherein rotor (1) is of conical shape with blades (5) curved in involutes and placed along the shaft (2) of the rotor (1) involutely on supporting disc (3) fixed on the shaft (2) of the rotor (1), while the blades (5) slope down from the upper edge of the shaft (2) towards the edge of the supporting disc (3).

Description

Wind Engine

Technical Field

The technical solution relates to a wind engine with vertical axis of rotation of the engine. Technical Background

At the present time, there are used two types of wind engines - with vertical axis of rotation and with horizontal axis of rotation. At the present time, mainly wind engines with vertical axis of rotation holding the propeller blades are mostly used in practice. This type of wind engines is usually equipped with swivelling propeller blades depending on wind strength and means for turning the blade rotation axis against the wind direction.

This type of wind engines requires for the swivelling propeller blades to be as long as possible and they require high poles that must be strong enough so as to resist extreme wind gusts. The disadvantages of wind engines with vertical axis of propeller rotation include various limitations resulting from narrower zone of wind speed use, mainly the unpleasant noise during operation. In inhabited areas with possibility of icing development, there is a risk of injuries by pieces of ice flying off the propeller surface while rotating. From the point of view of construction, wind engines with vertical axis of propeller rotation are demanding, while costs are quite high due to required construction strength.

Wind engines with vertical axis of rotation bring some construction simplifications and possibility of wind speed use within a bigger range of speeds. The basic advantage compared to wind engines with horizontal axis of rotation is the fact that they are able to work under any wind direction without necessity of swivelling within quite a wide range of wind speeds. There are many known solutions of wind engines. For example, there is known the solution of wind engine according to CZ PV 92-2983, with blades located in slewing way on a common carrier pivoted on a stand. The blades are slewed in relation to each other and each of the blades is equipped with a control arm connected to a controlled arm, pivoted on common carrier. The disadvantage of the wind engine is its significant intricacy, while the efficiency reached seems to be insufficient. Other solution with swinging blades is known from file CZ PV 1993-2166, when the swinging blades rotate around vertical axis and in operation position they lean on stops built in vertical semicircular shells. The wind engines seem to be intricate and its performance is not appropriate to it.

There is also known the solution according to CZ PV 2004-281, in which the wind engine includes a vertical shaft connected with at least two helical blades, arched in cross section. Each blade consists of horizontally aligned bands, the bigger sides of which overlap, while the smaller sides are fixed on side forrning curves, connected with the vertical shaft using floor-organised radial partitions with aerodynamic profile. Depending on the solution variant, a detector is placed along each blade on the central line. In case of this solution, there reached balanced distribution of wind load mainly under extreme wind loads.

Technical Solution Base

The aim of the technical solution is to make a wind engine with vertical axis of rotor, efficient just from the wind speed of 0,5 m/s with easily exchangeable construction elements that may operate without additional devices under various speeds and changes of wind directions.

This can be reached by a wind engine with vertical axis of rotor revolution, based mainly on the fact that the rotor is of conical shape with blades curved in involutes and placed along the rotor shaft involutely on supporting disc fixed on the lower end of the rotor shaft, while the blades slope down from the upper edge of the shaft towards the edge of the supporting disc. Such a geometry creates an efficient zone of wind catching even in case of rotor revolutions, which allows development of winding vortex flow, which creates underpressure on the spiral of the axis of rotation, which brings reduction of work load on basic nods of the wind engine and rotational force increase.

In consideration of blades assemblage simplification and their more precise placement it is advantageous for the rotor shaft to contain circumferential splines and the disc to contain involute splines for placement of rotor blades and their fixation.

In consideration of sufficient strength with simple construction it seems purposeful for the rotor shaft is pivoted in the upper and lower bearing on the frame containing at least arms that are sloped from the top of the frames housing the upper bearing sidelong the rotor up to the supporting disc, while the lower bearing is placed under the supporting disc on crossbeams. The rotor shaft passes through the lower bearing and the haft is kinematically connected with the driven appliance under the lower bearing.

In consideration of wind engine fixation it is advantageous for the frame to include fixation feet.

In consideration of efficiency it is advantageous for the blades to be ragged from the inside.

It is advantageous for the supporting disc to be of plastic and to be equipped with a supporting reinforcement. Figures in Drawings

The technical solution will be explained in detail using the drawings, where Fig. 1 shows an axonometric projection of the wind engine, Fig. 2 shows a schematic vertical axial section of the wind engine, Fig. 3 shows a schematic top view of the supporting disc and involutely spots of blades placement and Fig. 4 shows the blade in extended form.

Sample Realization Description

As it can be seen in Fig. 1 , the wind engine consists of engine I with its shaft 2 is pivoted on the frame 4 in vertical position. The rotor 1 is of conical shape, made of blades 5 convoluted in involutes around the shaft 2 of the rotor I and sloping towards the edge of the supporting disc 3. In extended shape, the blades 5 are in the form of a rectangular trapeze, see Fig. 4, with one of its arms 51 connected at the blade 5 longitudinally with the shaft 2, which is possibly equipped with splines 21 for more precise placement of blades 5. The base 52 convulted in involute, see Fig. 3, is placed on the supporting disc 3 fixed on the shaft 2 above the lower bearing 6.

The frame 4 of the wind engine consists of at least three, in sample version of four arms 7, that are sloped from the top 41 of the frame 4, housing the upper bearing 8 of the shaft 2, sidelong the blades 5 of the rotor 1 to the lower part 42 of the frame 4. In the lower part 42 of the frame 4 below the supporting disc 3 there is placed on beams 9 the lower bearing 6 of the shaft 2, with its end 21 passing through the lower bearing 6

The lower part 6 of the frame 4 is connected with frame 4 with fixation feet 71 e.g. of triangular shape for placement on not shown wind engine carrier. For the purposes of mass production it is suitable to use plastic or laminate for the supporting disc 3 and to equip the supporting disc 3 with a supporting reinforcement 10 with grooves 31_.

The shaft 2 under the lower bearing 6 houses the means connecting the movable shaft 2 with not shown appliance, which may be a dynamo, alternator, pump, and so on.

For the purpose of efficiency improvement, the blades 5 are ragged from the inner side. So as to avoid the appliance overloading, it is recommended to install a coupling 11 that disconnects the kinematic link between the shaft 2 and the appliance in case of critical overrewing of the engine 1 with wind speed above 50m/s.

The above described wind engine is able of active operation from wind speed of 0,5m/s up to approximately 50m/s, when there occurs the above mentioned disconnection of kinematic link between the shaft 2 of the engine and the appliance.

Claims

1. Wind engine with vertical axis of rotor rotation and curved rotor blades, characterised by the fact that the rotor (1) is of conical shape with blades (5) curved in involutes and placed along the shaft (2) of the rotor (1) involutely on supporting disc (3) fixed on the shaft (2) of the rotor (1), while the blades (5) slope down from the upper edge of the shaft (2) towards the edge of the supporting disc (3).

2. Wind engine according to claim 1, characterised by the fact that on the shaft (2) of the rotor (1) there are performed circumferential splines (14) and on the supporting disc (3) there are performed involute splines (31) for placement of blades (5) and their fixation.

3. Wind engine according to claim 1, characterised by the fact that the shaft (2) of the rotor (1) is pivoted in the upper bearing (8) and lower bearing (6) on the frame (4) containing at least three arms (7), that are sloped down from the top (41) of the frames (4), housing the upper bearing (8) sidelong the rotor (1) to the supporting disc (3), while under the supporting disc (3) the crossbeams (9) house the lower bearing (6), through which passes the shaft (2) of the rotor (1), which is kinematic connected under the lower bearing (6) with the driven appliance.

4. Wind engine according to claim I, characterised by the fact that the frame (4) includes fastening feet (71).

5. Wind engine according to claim 1, characterised by the fact that blades (5) are ragged from the inner side of the rotor (1).

6. Wind engine according to claim 1, characterised by the fact that the supporting disc (3) is made of plastic and it is equipped with a supporting reinforcement (10).