The subject of the invention is drum vertical axis wind turbine. The solution, as described in the invention, significantly increases the efficiency of a wind engine by reducing the braking torque on the rotor wings.

The vertical axis wind turbines, known so far in applications or publications, are based on Darrieus or Savonius models or modifications and reaction turbines with drum rotor, with various solutions of wings and wheels.

Following elaborations are included in the area of this invention:

The patent description, claim no. 328038 presents vertical axis wind turbine, with wings composed of movable segments. The movable segments are fixed in a rotatable manner on horizontal axis in the top part of a segment, they take normal, vertical position and they create a plane. They are fixed in such a way, that each bottom edge of an upper segment rests on the top edge of a segment situated below, independently of number of segments on a wing. That ensures the deflection caused by wind pressure is possible in one direction only. The wing creates minimal drag for the air flowing in this direction, in the opposite direction, when the wing is a plane surface, there is a maximal drag to the air flow. Ail movable segments and the wings are assembled in such a way on a common rotation axis, that they can move to horizontal position in one direction only, e.g. only to the left, in such case, the turbine rotor will rotate to the right under the wind pressure, creating the torque on the axis (turbine shaft).

The solution, protected with a patent, claim no. 390205, presents a vertical axis wind turbine, where the rotor is composed of several segments of wings, shifted with respect to each other at an angle, with one side fixed to the base and the other side to a flat frame, mounted on three supports, wherein the turbine is equipped with sheet, preferably of steel, placed between the tubular supports, that create diffusers; the cross-section of each sheet is a sector of a curve, preferably a circle. The diffusers are located outside the rotor and set at an angle to the rotor, so that the wind, blowing from any direction, is directed by the diffusers towards the rotor. The axis of rotation, with respect to which the diffuser is angled, is parallel to the axis of the rotor's rotation.

The wind turbine with the system of double rotors with variable geometry of the wings, in accordance with the invention, claim no. 3872S8, is equipped with vertical axis wind rotors, mounted vertically, one above the other, and the directions of the rotors' rotation are opposite. If the top wind rotor rotates to the right, then the bottom wind rotor rotates to the left. One wind rotor transfers the torque to the e.g. stator of the generator in the opposite direction to the rotation direction of the rotor of the generator. The control of the driving blades aims at changing the aerodynamic lift and the forces transferred to the driving system, and as a result, at smooth regulation of the rotation number with respect to own axis during very strong wind, considering the double wind rotors system, with rotors rotating in the opposite directions in order to transfer the wind energy to other devices.

The wind turbine of the power plant, in accordance with the invention presented in the description, claim no. 390976, is equipped with a rotor , rotating on a bearing on the vertical axis of rotation. The rotor is equipped with at least two wings, directed vertically, spaced symmetrically on the circumference of the movement trajectory, with rigid connection in the area of their centres of gravity with the horizontal rotor frame. Each of the wings has an upper and lower part, deflected radially and angularly outwards from the rotation axis of the rotor. The rotor frame is mounted on bearings, on horizontal stopper ring, by means of radial - semi-axial wheeled cars. The stopper ring, dimensions of the external diameter within the range of 0,1 to 0,9 of the diameter of wings mounting, is mounted on a support structure, composed of at least three columns, the height of which exceeds the length of the lower part of the wing.

Solution, in accordance with the patent, claim no. 394697, wherein the rotation of the rotor is caused by the difference between the segments created as a result of various aerodynamic drag on flat and narrow part of the wings due to appropriate location of the fenders. The operation of the vertical axis wind turbine, installed in a permanent, however detachable manner, by means of a hub, on a shaft of slow-speed generator, has a following course: if the wind blows from the bottom to the top margin, the right panel deflects to the right, pressure on the left panel causes rotation of the turbine to the right, bottom panel takes the position on the left. Independently, the turbine will always rotate to the right. In order to change the rotation direction, the lower wing should be raised above the fender and lowered back, however on the left side of the fender. Other wings should be adjusted in the same way.

The patent, claim no. 399907 presents a wind power plant with vertical rotation axis, composed of wind turbine, power plant base and a generator coupled with the turbine, wherein the turbine is of vertical type, composed of a vertical rotor, seated on the turbine axis, and of vertical diaphragms- wind baffles, characterised in that it is equipped with additional wind baffles, the lower baffle - umbrella shaped, and the upper baffle - shaped as a reversed umbrella, covered with an umbrella shaped roofing. The base of the power plant includes a tube of reinforced concrete, seated on a base of reinforced concrete covered with embankment. The current is generated by a generator, located in the space between the roofing of the turbine and its upper baffle or in the space under the lower baffle. The generator used in the power plant is equipped with certain number of magnets and on the inside surface of the stator there is a certain number of connector for coils, with a defined number of conductors made of insulated wire, where the ratio of connectors on the stator to the defined number of magnets is a half-number, expressed as = N,5, where N is any integer, and the ratio of the number of conductors to number of magnets in the generator is N/2, where N is an even integer larger than 2.

The wind turbine, in accordance with the invention, claim no. 391861, equipped with rotors and a generator, is composed of segmented, open metal tower, cuboid shaped, seated on concrete supports anchored in the ground. The vertical axis turbine rotor has working blades mounted on top and bottom bases, arranged horizontally, while the individual elements of the rotor are connected with metal support arms, located horizontally on a central, vertical axis, including three blades, with aerodynamic profile on the whole length of the cross-section, rotating around the central axis. At the centre of the rotor there is a rotor baffle, an element that directs the stream of wind, with top and bottom covers that protect the structure elements against the weather conditions and improve the aerodynamic properties of the rotor. The covers are connected with the shields on the base, assembled in the "h" distance from each other, the arms of the support structure are fixed onto the shields.

The description of the patent, claim no. 393945 presents a vertical axis wind turbine with horizontally oriented rotor, characteristic in that it is equipped with a set of profile rings, composed of at least two rings, arranged horizontally one under another, widening towards the top and creating a flow channel with the internal diameter fixed or slightly variable along the length. The turbine rotor is located in the lower part of the turbine, and the outlet nozzle is situated below the rotor and widens downwards, The cross-sections of the vertical elements, that connect the profile rings, are built as an aerofoil profile and they are attached on the turbine circumference to several vertical supports. Moreover the turbine is equipped with a device that smoothly changes distances between the ring during turbine's operation.

The patent description of the invention PL P.387538 defines the power plant with a vertical shaft, on said shaft there is a rotor with uniformly arranged blades, that are partially covered with a diaphragm, i.e. a section of cylindrical surface, and the blade on the side transferring the wind pressure has a complex shape. The blades are connected with a section of cylindrical surface, whose curvature matches the curvature of the rotor.

The patent description of the invention no. CN 101532471 presents a turbine with a vertical shaft, with the rotor seated in a magnetic bearing, where the magnetic field is created by means of an electromagnet, and the wind is channelled into 2 channels - baffles, of which one channel directs the stream of the wind parallel to horizontal axis of the rotor, and the other channel directs the wind stream at the angle of 35° to 40°, the channels are guided towards the wind by a flat surface - a tail of self-aligning type to the direction of the wind.

The state of the technology of the drum vertical axis wind turbines, as it is known nowadays, concerns only the structures that do not take into account the fact that there is an unfavourable influence of the of the wind on the rotor side of the turbine, where the effect of rotor braking occurs, or there are solutions that take into consideration this phenomenon, however they do not solve this problem efficiently, therefore such turbines are characterised with low efficiency in using the wind energy.

The drum vertical axis wind turbine, in accordance with the invention, composed of a wind motor with blades, mounted on a rack; with a shaft seated in a bearing on the rotor axis. The shaft is coupled with the generator shaft. The drum vertical axis turbine is characteristic in that on the circumference of the turbine there is an angled diaphragm, with the rotation angle equal 360°, the diaphragm is a section of the cylinder of an angle from 95° to 100° and its height is equal to the height of the rotor blades. In the upper part of the diaphragm there are arms with low-power electric drive; the arms are rotated by means of a toothed gear in the rotation axis of the diaphragm. The low-power electric drive receives a signal from the controller connected by the PLC system with the electronic measurement system of the turbine environment. The lower part of the diaphragm is protected against interference with the rotor blades by means of guiding rolls on the guiding rail located on the circumference of the rotor.

The drum wind turbine, in accordance with the invention, is also characteristic in that the electric system of the turbine is composed of a circuit of electric power created by the generator and a turbine diaphragm control circuit, that the electronic measurement system of the turbine environment, composed of wind direction indicator , wind speed gauge, temperature sensor and an insolation sensor. The measurement system is assembled directly next to the turbine. The control circuit of the turbine diaphragm consists of the electronic control system of the rotary diaphragm of the rotor, that consists of a buffer module, drive controller, low-power drive, control module for the network and power supply.

The electric power circuit consists of current generator, bridge rectifier and current frequency inverter.

The drum vertical axis wind turbine, in accordance with the invention, is presented in a drawing, where fig. 1 is a general layout of the turbine, fig. 2 horizontal cross-section of the turbine, and fig. 3 presents the vertical cross-section of the solution in accordance with the invention. The electronic measurement system, diaphragm drive control and power take-off from the turbine generator are presented as a diagram in fig. 4.

The drum vertical axis wind turbine, composed of a stand 1, where the rotor 2 of the wind motor with blades 3 is mounted; the blades 3 are mounted on a shaft 4, seated in a bearing in the rotor axis, the said shaft is coupled with the current generator shaft 5, in accordance with the invention is characterised with that there is a rotary diaphragm 6, mounted on the turbine rotor 2 circumference, with the rotation angle equal to 360°, that is a cylinder section with an angle between 95° to 100°, the height of which is equal to the height of the blades 3 of the rotor 2. In the upper part of the diaphragm 6 there are rotary arms 7 with low-power electric drive 11; the arms are rotated by means of a toothed gear 10 in the rotation axis of the diaphragm 6.

The low-power electric drive 11 receives a signal from the controller connected by the PLC system with the electronic measurement system 12 of the turbine environment. The lower part of the diaphragm 6 is protected against interference with the rotor 2 blades 3 by means of guiding rolls 8 on the guiding rail 9 located on the circumference of the rotor of the wind motor 2. The electronic measurement system 12 of the turbine environment is located directly next to the turbine.

The electronic system of the turbine consists of electric circuit of the power created in the generator s and a control circuit of the diaphragm 6, that is composed of electronic measurement system 12 of the turbine environment, electronic control system of the diaphragm 6 and a electric power circuit composed of current generator 5, bridge rectifier and current frequency inverter. The electronic measurement system 12 of the turbine environment consists of wind direction indicator, wind speed gauge, temperature sensor and insolation sensor. The electronic control system of the diaphragm 6 consists of a buffer module, drive controller, low-power drive, control module for the network and power supply.

The drum vertical axis wind turbine, in accordance with the invention, eliminates unfavourable phenomenon of rotor braking, thus ensures an increase of the turbine efficiency up to 40 %. Parts list:

(fig.1 - 3) -turbine stand

-turbine rotor

- rotor wings

-turbine shaft

-generator

- rotating diaphragm

- rotating diaphragm arms, with electric drive

- rolls guidingthe diaphragm in the rail

- diaphragm guiding rail

- toothed gear

- diaphragm electric drive

- electronic measurement system of the turbine environment