DE102014009962A1 - Energy conversion according to Bernoulli principle - Google Patents

Abstract

The invention relates to a device (2) for converting between mechanical energy (4) and electrical energy (6) comprising: - a housing (20) enclosing an interior space (22) with an opening (58) opening outward from the interior space (22) ), - in the interior (22) received electrical machine (14), and - at least one with the electric machine (14) operatively connected to a rotation axis (16, 44) in a rotational movement range (64) rotatable blade (48), - wherein the axis of rotation (16, 44) extends through the interior (22) of the housing (20) and the rotational movement region (64) projects radially outward (62) via the opening (58).

Description

The present invention relates to a device for converting between mechanical and electrical energy.

For the conversion between mechanical energy and electrical energy, that is, either from electrical energy to mechanical energy or vice versa, electrical machines can be used. For example, it is from the DE 20 2011 104 180 U1 known to set up an axial rotor of a blade carrier and circumferentially around the blade carrier arranged blades upright on the ridge of a roof and thus to drive a generator. The roof represents a housing that accelerates due to its shape impinging wind and passes it through the axial rotor.

It is an object of the invention to improve the conversion between mechanical energy and electrical energy.

The object is solved by the features of independent claim 1. Preferred developments are the subject of the dependent claims.

According to one aspect of the invention, a device for converting between mechanical and electrical energy comprises a housing enclosing an interior with an opening to the outside of the interior, an electric machine accommodated in the interior, and at least one operatively connected to the electric machine, about a rotation axis in a rotary rotating blade rotatable blade, wherein the axis of rotation extends through the interior of the housing and the rotational movement region projects radially outwardly via the opening.

Based on the aforementioned, edgewise mounted axial rotor of the specified device is based on the consideration that the use of the axial flow passing through the flow, so the wind, on the one hand only with a poor efficiency and on the other hand only with a relatively high technical complexity is possible. The aforementioned axial rotor stands on the ridge of the roof only one at a very specific punctiform point and therefore can use the accelerated by the roof flow only in a correspondingly small area. Furthermore, so-called air guiding parts are necessary for an effective use of the axial rotor, since the accelerated from the housing in the form of the roof flow otherwise seen from the axis of rotation of the axial rotor attack radially on both sides of the blades of the axial rotor and would be mutually repealed and / or extinguished.

Here, the specified device attacks with the proposal not to receive the axial rotor outside of the flow-accelerating housing but within the interior of this housing, so that the axis of rotation of the axial rotor extends through the interior of the housing. The blades of the axial rotor are then viewed from the axis of rotation of an opening in the housing radially on one side out of the housing, so that the blades project radially out of the housing in this area. In this outstanding area, the flow accelerated by the housing can then engage the blades and rotate the axial rotor. Because the axial rotor is viewed from the rotation axis taken on the radially other side in the interior of the housing, there can not attack flow and thus do not cancel the driving action of the axial rotor. In this way, the flow over the entire width of the housing can be used without additional technical elements, such as the air guide elements, in the aforementioned case of the roof are necessary.

In the context of the present invention, the housing is called a flow-mechanical boundary layer or fluidic wall. The housing only needs to partially encase the interior space and can therefore comprise further openings in addition to the opening which is radially penetrable by the blade, in particular in places , which are not fluidly relevant to the practice of the invention. Basically, the housing deflects an angular impinging flow, accelerates it as in the aforementioned roof (Bernoulli effect) and leads them to the radially projecting through the opening part of the blade. Therefore, in the context of the present invention, the Bernoulli effect is exploited. The flow can be provided by any fluid and thus by any gas and / or any liquid.

Depending on the design of the electrical machine as an electric generator or as an electric motor, the blade can be driven accordingly by the flow and generate electrical energy with the electric generator or generate a flow with the electric motor itself, and are thus used for example as a drive.

The housing may have any shape in profile, for example the shape of a wedge, wherein the axial rotors can be arranged in the flow direction with an increasing radial extent.

In a further development of the specified device, the housing in a profile viewed in the direction of the axis of rotation is an aerofoil. or wing profile. This development is based on the consideration that the aforementioned Bernoulli effect should be used as effectively as possible. For this purpose, the wing profile offers. An airfoil or wing profile is called, characterized in that it has a top and a bottom, with both sides converge on a profile nose. An inflowing flow on the profile nose is separated at this point and then flows over the top and bottom. By forming the airfoil profile with different curvatures at the top and bottom, the Bernoulli effect acts whereby the flows pass the top and bottom at different speeds. As a result, different pressures develop at the top and the bottom. In a conventional airfoil, the curvatures at the top and bottom are chosen so that the pressures that are formed at the bottom are higher than at the top to allow buoyancy. Therefore, the top of the airfoil is to be referred to below as the vacuum side and the bottom below as the pressure side.

In this case, the above-mentioned opening to the interior should be arranged in a particular embodiment of the specified device on the negative pressure side of the airfoil. As already explained, the negative pressure side is that side of the airfoil profile on which the flow is accelerated due to the Bernoulli effect with respect to the overpressure side. If the electric machine is operated as an electric generator, the above-mentioned blade is moved with the accelerated flow, so that the conversion of mechanical energy into electrical energy can be carried out more efficiently. The same applies, of course, in the event that the electric machine is an electric motor for converting electrical energy into mechanical energy, ie into a flow.

In another embodiment of the specified device, the negative pressure side opposite overpressure side of the airfoil profile is flat or directed concave in the interior. In this way, the specified device can be easily attached to existing structures, such as walls or the like, to generate electrical or mechanical energy.

In yet another development of the specified device, the blade is movably arranged on a blade carrier rotatable by the electric machine about the axis of rotation. Due to the movable arrangement, the blade can be used radially in the interior of the housing to the blade carrier, in order to reduce the space required for the blade in the interior in this way. As a result, the movement resistance is reduced in the interior of the housing, which opposes the blades due to air or a liquid in the interior of the housing. For this purpose, in the specified device in a particularly favorable manner, a boundary wall defining the range of rotational movement can be arranged in the interior of the housing, on which the blade movably arranged on the blade carrier can be deflected. In this way, the movement of the blade on the blade carrier no further power source, as required in the engine or the like, which effort and cost can be saved.

Conveniently, the blade should be rotatably mounted on the blade carrier about a fulcrum radially spaced from the axis of rotation. In this way, the blade is always reset by the caused by the rotation of the axial rotor centripetal force in an original position when it is no longer deflected by the boundary wall.

In a development, the specified device comprises a flow channel in which the housing is arranged.

According to a further aspect of the invention, an arrangement for converting between mechanical and electrical energy comprises a flow channel whose wall is at least partially formed by at least one of the specified devices. Due to the specified device, the flow channel is tapered transversely to the flow direction, whereby the already mentioned above Bernoulli effect can be optimally utilized.

The above-described characteristics, features, and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments which will be described in connection with the drawings.

1 in a schematic view a device for converting between mechanical and electrical energy,

2 in a profile view an example of the device of 1 .

3 in a perspective view of the device 2 .

4 in a sectional view of an axial rotor for the device 3 .

5 in a sectional view of the axial rotor 4 operational,

6 in a perspective view of an arrangement for converting between mechanical and electrical energy with a device from 2 .

7 in a perspective view of an alternative arrangement for converting between mechanical and electrical energy with a device from 2 .

8th in a perspective view of an application of the device 2 .

9 in a perspective view of an alternative application of the device 2 , and

10 in a perspective view of a still alternative application of the device 2 demonstrate.

In the figures, the same technical elements are provided with the same reference numerals and described only once.

It will open 1 taken, which in a schematic view a device 2 for converting between mechanical energy 4 and electrical energy 6 shows.

Under the mechanical energy 4 For example, a flow indicated by arrows 8th fall while under the electrical energy 6 for example, an electrical voltage 10 in combination with an electric current 12 can fall.

The device 2 has an electric machine 14 on, to which the electrical voltage 10 can be applied. With the electric machine 14 is operatively connected, for example via a wave 16 a blading 18 that by the flow 8th is flowed through. The wave 16 itself can of course be interrupted by a not further shown gear or the like.

For the conversion between mechanical energy 4 and electrical energy 6 Basically two cases are conceivable. In the first case, the blading turns 18 based on the already existing flow 8th over the wave 16 the electric machine 14 so that the electric machine 14 the electrical voltage 10 generated. In this case, the blading 18 as a turbine and the electric machine 14 referred to as an electric generator. In the second case, the electric machine turns 14 based on an existing electrical voltage 10 over the wave 16 the blading 18 so the blading 18 the flow 8th generated. In this case, the blading 18 as a compressor and the electric machine 14 referred to as an electric motor.

The device 2 should be usable for both cases.

It will be on the 2 and 3 Reference is made to the corresponding in plan view and a perspective view an example of the device 2 demonstrate.

The device 2 includes a housing 20 that has an interior 22 from an outdoor space 24 separates. The housing 20 includes a partial with a in 3 not shown outer skin 25 coated formwork scaffolding. The formwork framework comprises substantially parallel to each other and circumferentially around the interior to be enclosed 22 struts arranged with a profile to be described later 26 of which in 3 For the sake of clarity, not all are provided with a reference numeral. End are the struts 26 each on a cover plate 28 fixed. Further, between the struts 26 in the interior 26 still bearing plates 30 with bearing bores 32 kept in that for blading 18 belonging axial rotors 34 are rotatably mounted. The bearing plates 30 can do this on the end plates 28 via support elements 36 be attached to the stability of the formwork framework of the housing 20 to increase.

The profile with which the struts 26 the interior 22 of the housing 20 include is in the context of the present embodiment, a wing profile, or called wing profile. The airfoil has an upper surface 38 and a bottom 40 on that at a profile nose 42 converge. The top 38 is curved convexly. The curvature of the underside 40 can be arbitrary, ie convex, concave or flat, be formed, with the restriction that, although the bottom 40 is convexly curved, a degree of curvature of the top 38 is greater than a degree of curvature of the bottom 40 , In the present embodiment, the bottom is 40 just executed, so that the device 2 in a simple manner to a support, such as attach a building. In addition, the degree of curvature should be the top 38 be chosen so that the top 38 opposite the bottom 40 in the 2 profile shown is between 10% and 30%, preferably between 15% and 25% and particularly preferably 20% longer.

Meets the flow to be generated or generated 8th in use of the device 2 on the profile nose 42 of the housing 20 so does the one in the DE 20 2011 104 180 U1 explained Bernoulli effect and accelerate the flow 8th on the top 38 , As is known, for example, from aviation technology, the result is the acceleration of the flow 8th at the top 38 a relative negative pressure to the bottom 40 , which results in a relative overpressure. For this reason, the top should 38 and the bottom 40 hereafter as negative pressure side 38 and as overpressure side 40 be designated. These pressure conditions provide when using the airfoil, for example in aeronautical engineering in an aircraft for the buoyancy.

Based on the Bernoulli effect on the vacuum side 38 accelerated flow 8th should be doing on the axial rotors 34 the blading 18 act, thus the flow 8th can either be generated or used. This will be discussed in more detail below, including the 2 and 3 in addition to the 4 and 5 Reference is made to one of the axial rotors 34 the blading 18 show in a sectional view. Here are the individual elements of the axial rotors 34 for the sake of clarity, only in the 4 and 5 and not in the 2 and 3 provided with a reference numeral.

The individual axial rotors 34 the blading 18 are essentially the same in the present embodiment and differ only in their size. Each axial rotor 34 the blading 18 includes a blade carrier with a shaft 44 that in the bearing bores 32 the bearing plates 30 is held. The waves 44 the individual axial rotors 34 can with the in 1 shown wave 16 be operatively connected, for example via not shown transmission. Alternatively, it may be at the shaft 44 and the wave 16 of the 1 to act on the same component, especially if in the device 2 only a single axial rotor 34 as a blading 18 is used.

On the wave 44 are axially spaced from each other concentric with the shaft 44 two circular retaining washers 46 attached, which for the sake of clarity also in 3 on one of the axial rotors 34 are also provided with a reference numeral. In the peripheral region of the retaining washers 46 are in the 4 and 5 not further visible bearing bores formed. The bearing bores are arranged in the present embodiment, that a bearing bore on a retaining disc 46 and a bearing bore on the other retaining disc 46 axially opposite, so in the circumferential direction around the shaft 44 Seen are not offset from each other. However, this is not essential to the practice of the invention. In each case two axially opposite bearing bores on the retaining disks is in each case a swivel flap-like blade formed 48 stored. In the present embodiment are on each axial rotor 34 eight swivel-flap-like blades 48 present, which is purely exemplary.

The number of swivel flap-like blades 48 may in principle be arbitrary from one upwards, with the present invention in a number of four to ten pivoting flap-like blades 48 , in particular eight swivel flap-like blades 48 is particularly effective to implement. Specifically, there is a version with six pivoting flap-like blades 48 at.

The swing flap function of the individual blades 48 is in the present embodiment via handrails 50 possible, with each handrail 50 the individual blades 48 in each case two axially opposite bearing bores of the retaining washers 46 are stored, so that the individual handrails to the shaft 44 axially aligned and parallel to each other. In this way, the in 4 indicated blades 51 the blades 48 that is the surfaces of the blades 48 where the flow 8th can attack, in the circumferential direction around the shaft 44 alignable, so that the effect of the flow 8th on the blades 48 is maximum. Are the individual bearing holes on the retaining washers 46 not axially opposite but circumferentially around the shaft 44 staggered to each other, then run the individual handrails 50 to the wave 44 askew. Also, the individual bearing bores need not necessarily be arranged such that the mounted handrails 50 and with it the individual blades 48 parallel to each other.

Every scoop 48 has a holding frame in the present embodiment 52 , over which the appropriate holding rod 50 the shovel 48 is fixed.

Through the pivoting flap-like storage of the blades 48 Can the individual blades 48 one by the shaft 44 extending pivot axis with a in 4 on one of the blades 48 indicated swivel angle 54 be pivoted. On every shovel 48 becomes the swivel angle 54 while a blocking element 56 limited. In principle, the embodiment of the arrangement of the pivoting flap-like blades 48 be solved constructively in a different way.

In order to operate the device 2 at the negative pressure side 38 of the housing 20 accelerated flow 8th to generate or use the blades 48 the individual axial rotors 34 be brought into operative contact with this, as already mentioned. This is in the outer skin 25 of the housing 20 for each axial rotor 34 an opening 58 formed by the blades 48 of the respective axial rotor 34 in the outside space 24 can be swiveled.

In the interior 22 of the housing 20 is every axial rotor 34 from a boundary wall 60 surround. The boundary wall 60 is in a not further referenced distance to the axial rotor 34 arranged so small that the blades 48 around the above-mentioned pivot axis to the shaft 44 of the axial rotor 34 be pivoted. Reach a shovel 48 the opening 58 she can get off the shaft 44 of the axial rotor 34 away to the outside space 24 be swung back. As a rule, the centripetal force, which is required when rotating the axial rotor, is sufficient for any necessary pivoting force 34 on the blades 48 acts. In addition, however, a swiveling auxiliary force can also be provided, for example, by a return element.

The outdoor area 24 in which the blades are 48 an axial rotor 34 will be referred to as outdoor movement area below 62 the blades 48 of the respective axial rotor 34 designated. The outside movement areas 62 the individual axial rotors 34 are in 2 shown dotted. For every axial rotor 34 form the corresponding external movement areas 62 together with those of the corresponding boundary walls 60 surrounded areas a rotary motion area 64 in which the corresponding axial turbine 34 with their shovels 48 rotates.

One in electrical energy 6 to be converted flow 8th can therefore contact the blades 48 of the axial rotor 34 in the outdoor movement area 62 the blades 48 attack and so the shovels 48 in an in 4 and 5 indicated direction of rotation 65 rotate. Accordingly, one from the electrical energy 6 flow to be generated 8th with the blades 48 of the axial rotor 34 in the outdoor movement area 62 be brought about. The blocking elements take care of that 56 for the blades 48 at the attack of the current 8th in a radial to the shaft 44 running position to stay upright and from the flow 8th not further or possibly not be pivoted too far. Reach the blades 48 the end of the outside movement area 62 and thus the end of the opening 58 then hit the shovels 48 to the boundary wall 60 on, thereby counteracting the flow 8th seen in the circumferential direction around the shaft 44 be pivoted backwards. The handrails 50 opposite end of the blades 48 then grinds at the end in this gifted state on the boundary wall 60 along it until it opens again 58 reached. Following that are the shovels 48 swung back again and aligned radially so that the flow 8th can attack them again.

A corresponding return pivoting force can in principle only by the flow 8th and those on the blades 48 acting Zentripetalbeschleunigung be provided, in which case a start-up aid would be necessary if the blading 18 for example, used as a turbine at first only very slowly turns. On this start-up can also be omitted if the blades 48 be swung back, for example, with the above-mentioned pivoting auxiliary force. In this case, the pivotal assistance force does not need to be designed excessively large, because the flow 8th and the centripetal acceleration after starting is sufficient for the pivoting back.

The aforementioned not further referenced distance between the boundary wall 60 and the axial rotor 34 can be designed to be constant in principle. The disadvantage of this would be that the blades 48 still in one completely to the shaft 44 pivoted state in the outdoor movement area 62 enter. In this way, the change between the flow 8th and the electrical energy 6 only be performed with a reduced efficiency, because the blades 48 after entering the outside movement area 62 first have to be swung back. When the blades exit 48 from the outside movement area 62 however, these would be at the end of the boundary wall 60 strike and abruptly to the shaft 44 be pivoted. This would be the blades 48 be exposed to very high mechanical loads, which would result in a correspondingly high wear. In order to avoid at least one of the two aforementioned disadvantages, the distance between the boundary wall 60 and the axial rotor 34 to the exit area and / or entry area into and / or out of the outer movement area 62 , as in 2 shown to be continuously increasing in the exit area and respectively be designed to reduce in the inlet area. Particularly preferred should be the distance between the boundary wall 60 and the axial rotor 34 be formed such that the blades 34 the boundary wall 60 or other parts of the housing 20 such as the struts 26 only with her the handrails 50 Touch opposite end, leaving the blades 48 not me her shovels 51 to the housing 20 can strike. Optionally, the blades can be equipped at this end with rolling elements, such as rollers, which may for example be horizontal, to the friction on the boundary wall 60 and thus reduce wear.

In 2 are in the device 2 with the wing profile exemplarily four axial rotors 34 installed. For high efficiency it has been shown that the use of three to six axial rotors 34 Per contraption 2 makes the most sense. The individual axial rotors 34 in the device 2 can then, for example via the aforementioned transmission to a common electric machine 14 be connected.

Instead of in 2 to 5 shown blades 48 can also be used as a flow trap half shells or spiral wings, which are also both pivotally usable.

It will open 6 and 7 Referred to the arrangements 66 for converting between mechanical energy 4 and electrical energy 6 with a previously described device 2 shows. The elements of the device 2 themselves are the 6 and 7 for clarity, not provided with reference numerals.

The order 66 of the 6 includes a wind tunnel 68 who is in the picture plane of the 6 in laterally through each a previously mentioned device 2 is completed. On the end plates 28 of the devices 2 is ever a cover plate 70 put on the two devices 2 connects to each other, and so the flow channel 68 into the picture plane of the 6 Into the top and bottom limit.

In the present embodiment, the flow channel 68 thus constructed with a quadrangular cross-section. However, this cross-sectional shape can only be seen by way of example and can in principle be of any desired design, such as, for example, circular, square, rectangular or arbitrarily polygonal having three, five, six or eight corners.

The devices 2 are in the flow channel 68 arranged such that the negative pressure side 38 in the flow channel 68 is furnished. This arrangement of the two devices 2 of the 6 may also be referred to below as a double wing.

The flow 8th can through the flow channel 68 be guided in a direction that is in 6 indicated by an arrow. The flow channel 68 is doing by the two arranged as a double wing devices 2 transverse to the direction of the flow 8th narrows the flow 8th even accelerated due to the Bernoulli effect mentioned above. Due to the acceleration effect can for the flow 8th Speed gains of up to 20% can be achieved when the bends of the devices 2 For example, be carried out with the above dimensions.

In principle, in the arrangement 66 any number with their vacuum sides 38 Paired devices 2 , so double wings, arranged and thus any number of flow channels 68 be formed. In 7 is the arrangement 66 by way of example with two flow channels 68 shown.

In the arrangements 66 can in addition to the devices 2 in the flow channels 68 , such as in 9 and 10 shown more devices 2 be arranged, the negative pressure side 38 from the arrangement 66 is directed away. Under the above assumption that in a device between three and six axial rotors 34 can be installed, can thus be in a single arrangement 66 with, for example, two flow channels 68 between 24 and 48 Axialrotoren 34 then all for the conversion between mechanical energy 4 and electrical energy 6 can be used.

Below are various uses of the arrangements 66 of the 6 and 7 described.

In 8th is the use of the arrangement 66 of the 9 shown as Wasserströmkraftwerk. As part of the water flow power plant is a water flow 8th as occurs, for example, in flowing water currents or tidal currents, as mechanical energy 4 through the arrangement 66 into electrical energy 6 implemented. The axial rotors 34 the blading 18 in the devices 2 become as turbines and the electric machine 14 used as a generator.

In 8th are the individual elements of the arrangement 66 for the sake of clarity, not provided with own reference signs.

The order 66 is in 8th flow input side with a protective element 72 completed in the form of a grid, to avoid the devices 2 potentially damaging substances, such as dirt and flotsam, in the flow channel 68 can penetrate.

The order 66 is in 8th in their height 74 above the ground 76 from a platform 78 out over a linkage 80 adjustable to the height 74 the arrangement 66 to the conditions of the current 8th adapt.

In 9 is the use of the arrangement 66 of the 7 shown as a wind turbine. As part of the wind turbine, a wind flow, not shown, as a mechanical energy 4 through the development of the arrangement 66 into electrical energy 6 implemented. The axial rotors 34 the blading 18 in the devices 2 become with it as turbines and the electric machine 14 used as a generator.

At the arrangement 66 of the 9 are opposite the arrangement 66 of the 7 at the of the flow channels 68 seen outsides other devices 2 arranged, the negative pressure side 38 directed to the outside. One of these other devices 2 is in the view of 7 not to be seen. In this way can from the the arrangement 66 passing wind flow a maximum value of mechanical energy 4 into electrical energy 6 be implemented. The outward-facing further devices are absolutely necessary 2 However not.

The development of the arrangement 66 is in 9 on a carrier 82 carried. The carrier 82 although a boat can be used, a pontoon is to carry the arrangement 66 but more convenient. Under a pontoon is usually understood a floating body, usually anchored firmly (see reference numeral 82 in 9 ), is used as a water level-dependent carrier for various tasks. In contrast to the boat he is mostly transportable, but only limited driving. The pontoon can be used as a concrete pontoon, for example, in the form of an in 9 Trimarans are executed. Alternatively, as a carrier 82 also used and largely dismantled, but still stable ships (that is dismantled, without the original superstructures) are used. In any case, the carrier should 82 be anchored to the bottom of the sea, lake or running water, so that the arrangement 66 always optimally align with the direction of the wind flow to be converted.

At this point it should be noted that the arrangement 66 also at the bottom of the carrier 82 directed into the water could be attached to a in 8th shown water flow 8th to use.

If in every device 2 , as in 2 shown four axial rotors 34 are included, then includes the entire, in 9 shown arrangement 66 a total of 32 axial rotors 34 What a high potential for generating electrical energy 6 expect. The flow channels 68 the arrangement 66 For example, in cross-section with a width of 80 m and a height of 80 m, the length of the flow channels 68 could be dimensioned with 150 m. That means that the device 2 in her in 2 seen profile could be formed with a length which is 1.5 to 2 times greater than their depth seen in the profile direction.

The overall height of the plant 66 could be dimensioned with up to 100 m.

To further increase energy production, the outer skin could 25 of the devices 2 the arrangement 66 as well as the surface 86 of the carrier 82 be executed as solar modules.

In 10 is a possible use of the plant 66 of the 6 and 7 for converting electrical energy 6 in mechanical energy 4 shown on a ship.

One or more independent housings are mounted with the axial rotors below a ship's hull. They can be reversibly installed for the left / right control of the hull parallel or against each other and / or forward / backward in their flow generation direction.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202011104180 U1 [0002, 0038]

Claims (10)

Contraption ( 2 ) for converting between mechanical energy ( 4 ) and electrical energy ( 6 ) comprising: - an interior space ( 22 ) enclosing housing ( 20 ) with an interior ( 22 ) opening to the outside ( 58 ), - one in the interior ( 22 ) recorded electrical machine ( 14 ), and - at least one with the electric machine ( 14 ) operatively connected to a rotation axis ( 16 . 44 ) in a range of rotational movement ( 64 ) rotatable blade ( 48 ), - where the axis of rotation ( 16 . 44 ) through the interior ( 22 ) of the housing ( 20 ) and the range of rotation ( 64 ) over the opening ( 58 ) radially outward ( 62 protrudes. Contraption ( 2 ) according to claim 1, wherein an airfoil ( 51 ) of the blade ( 48 ) in the circumferential direction about the axis of rotation ( 16 . 44 ) is alignable. Contraption ( 2 ) according to claim 1 or 2, wherein the housing ( 20 ) in a direction of the axis of rotation ( 16 . 44 ) Profile seen is a wing profile. Contraption ( 2 ) according to claim 3, wherein the opening ( 58 ) on a vacuum side ( 38 ) of the airfoil is arranged. Contraption ( 2 ) according to claim 3 or 4, wherein one of the negative pressure side ( 38 ) opposite overpressure side ( 40 ) of the wing profile flat or in the interior ( 22 ) directed concave. Contraption ( 2 ) according to one of the preceding claims, wherein the blade ( 48 ) movable at one about the axis of rotation ( 16 . 44 ) rotatable blade carrier is arranged Contraption ( 2 ) according to claim 6, comprising a rotary movement area ( 64 ) defining boundary wall ( 60 ) in the interior ( 22 ) of the housing ( 20 ), on which the blade movably arranged on the blade carrier ( 48 ) is distractable. Contraption ( 2 ) according to claim 6 or 7, wherein the blade ( 48 ) on the blade carrier about a radially from the axis of rotation ( 16 . 44 ) spaced pivot point ( 56 ) is rotatably arranged. Contraption ( 2 ) according to one of the preceding claims, wherein the electric machine ( 14 ) is an electric generator or electric motor. Contraption ( 2 ) according to one of the preceding claims comprising a flow channel ( 68 ) in which the housing ( 20 ) is arranged.

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