WO2007097659A1 - Screw turbine - Google Patents

Screw turbine Download PDF

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Publication number
WO2007097659A1
WO2007097659A1 PCT/RU2007/000050 RU2007000050W WO2007097659A1 WO 2007097659 A1 WO2007097659 A1 WO 2007097659A1 RU 2007000050 W RU2007000050 W RU 2007000050W WO 2007097659 A1 WO2007097659 A1 WO 2007097659A1
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WIPO (PCT)
Prior art keywords
axis
parts
blades
bladed
screw
Prior art date
Application number
PCT/RU2007/000050
Other languages
French (fr)
Russian (ru)
Inventor
Dmitry Anatolievich Kapachinskikh
Original Assignee
Kapachinskikh Dmitry Anatoliev
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Application filed by Kapachinskikh Dmitry Anatoliev filed Critical Kapachinskikh Dmitry Anatoliev
Publication of WO2007097659A1 publication Critical patent/WO2007097659A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B17/00—Other machines or engines
    • F03B17/06—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head"
    • F03B17/061—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially in flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/202—Rotors with adjustable area of intercepted fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/221—Rotors for wind turbines with horizontal axis
    • F05B2240/2211—Rotors for wind turbines with horizontal axis of the multibladed, low speed, e.g. "American farm" type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/50—Kinematic linkage, i.e. transmission of position
    • F05B2260/502—Kinematic linkage, i.e. transmission of position involving springs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the invention relates to energy.
  • a screw turbine can be used to convert the kinetic energy of a moving fluid or gas into mechanical or electrical energy.
  • a screw-turoin consisting of supplied with blades.
  • Parts are mounted on an axis parallel to the direction fluid or gas movements.
  • the first part is fixed motionless on the axis, the remaining parts are mounted on the axis with the possibility of rotation within the limits determined by the limiters mounted on adjacent parts, the last part is connected to the axis by a spring mechanism.
  • Adjacent parts can be connected by spring mechanisms.
  • each item, movable relative to the axis it may be coupled with the axis of the spring mechanism.
  • Limiters can be made in the form of a spike and groove or in the form of a shock absorber.
  • FIG. 1 parts B, C, D (Fig. 2, 3, 4) are mounted on the axis 1 with the possibility of rotation. All parts are equipped with limiters (rotation), which are made in the form of a spike 2 and a groove 3 on adjacent parts (on the first part, a groove 3 may be absent, in Fig. 1, part A is made without groove 3), so that the spike 2 of part A is aligned with a slot 3 of part B 5, in this case, in the extreme position of the tenon in the groove, the blades of part B are aligned with the blades of part A, and further, the blades of part C with the blades of part B and the blades of part D with the blades of part C.
  • limiters rotation
  • the limiters can be made in the form of shock absorbers 5 (Fig. 9-11) mounted on adjacent parts.
  • the spring mechanism 4 can be made in the form of a spiral spring (Fig. 4), fixed on the axis 1 and on the last part D.
  • the spring mechanism 4 (hereinafter, the spring 4) creates tension so that the blades of all parts in the absence of flow or low flow liquid or gas were completely straightened.
  • Each of the parts moving relative to axis 1 (B 5 C, D) can be connected by a spring 4 to the axis. Adjacent parts can be spring-loaded
  • the screw turbine operates as follows.
  • the blades When folded, the blades are supported by each other and have a smaller working area, which provides increased strength. When weakening the air flow, the spring 4 will open the blades in the reverse order. In this embodiment of the screw-turbine, only slight fluctuations of the blades are possible at the moment when the flow force begins to fold the blades and the spike 2 is not in the extreme positions of the groove 3.
  • shock absorbers 5 can be used (Fig. 9-12), which are attached to adjacent parts and in extreme positions provide the addition of the blades or the full opening of the screw-turbine, moreover, the folding takes place without hindrance, and the opening with resistance (slow).
  • FIG. 4 shows an example of a screw-turbine with eight blades from four 2-blade parts, however, there can be a different number of parts with blades and the blades themselves, depending on the feasibility.
  • the pair of stud-grooves on each next part is made with the possibility of rotation by the required angle relative to the previous part (in the example presented, this angle is 45.
  • the connection of each part (except the first part A) with springs 4 of different elasticity with axis 1 or with adjacent parts allows you to control the addition of blades of different parts with a certain wind force, which simplifies the process of adjusting the installation.
  • a screw turbine when used in wind energy will help increase wind turbines. Given that usually the wind speed is 5-10, the wind turbine reaches its maximum energy output at 15 m / s, then the generation of electricity by a wind farm can increase several times.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Wind Motors (AREA)
  • Support Of The Bearing (AREA)
  • Hydraulic Turbines (AREA)

Abstract

The invention relates to power engineering. The inventive screw turbine can be used for converting the kinetic energy of running liquids or gas into mechanical or electric power. The aim of said invention is to increase the energy efficiency of variable-speed flowing gases and liquids and to reduce a flow resistance when high loads are applied. The inventive screw turbine comprises parts which are provided with blades and mounted on an axis in a parallel position with respect to the direction of the liquid or gas flow, wherein the first bladed part is fixed to the axis, whereas the remaining bladed parts are positioned in such a way that they are rotatable within the limits defined by stops which are mounted on the adjacent bladed parts and the last bladed part is connected to the axis by means of a spring mechanism. The stops are embodied in the form of a pin and groove or in the form of shock absorbers. The adjacent bladed parts can be interconnected by spring mechanisms. Each bladed part can be also connected to the axis by a spring mechanism.

Description

Изобретение относится к энергетике. Винт-турбина может использоваться для преобразования кинетической энергии движущихся жидкости или газа в механическую или электрическую энергию.The invention relates to energy. A screw turbine can be used to convert the kinetic energy of a moving fluid or gas into mechanical or electrical energy.
Известны лопастные винты, имеющие малый KПДЭ поскольку большая часть газа или жидкости проходит через зону его вращения, не выполняя работы. Многолопастные турбины имеют высокий КПД, но из-за этого испытывает повышенные нагрузки и выходят из строя даже при применении в изготовлении лопаток специальных сталей иKnown rotor blades having a small KPD E since most of the gas or liquid passes through the zone of its rotation without performing work. Multi-vane turbines have high efficiency, but because of this, they experience increased loads and fail even when using special steels in the manufacture of blades and
Известны ветрогенераторы по патентам US6856042, US6945747 в которых лопасти двух соосных роторов могут перекрывать друг друга при усилении ветра. РоторыKnown wind generators according to patents US6856042, US6945747 in which the blades of two coaxial rotors can overlap each other when the wind is amplified. Rotors
cиcтeмэ выполненньк независимыми для каждого из роторов. Кроме того, невозможно увеличить количество роторов без существенного усложнения механизмов.cictem e vypolnennk independent for each of the rotors. In addition, it is impossible to increase the number of rotors without significantly complicating the mechanisms.
Известен ветряной двигатель по патенту SU 16619, выбранный в качестве прототипа, в котором два соосных ветряка взаимодействуют при помощи пружин, причем, один изKnown wind turbine according to patent SU 16619, selected as a prototype, in which two coaxial windmills interact using springs, moreover, one of
jочей площади лопастей. Другим недостатком является большие колебательные движения лопастей, возникающие при одновременном действии на лопасти ветра и пружины, вал вращается рывками, уменьшается ресурс ветряного двигателя.joche area of the blades. Another disadvantage is the large oscillatory movements of the blades that occur when the wind and springs act simultaneously on the blades, the shaft rotates jerkily, and the life of the wind engine decreases.
использования энергии движущихся с переменной скоростью газов и жидкостей, а также уменьшение сопротивления потоку при больших нагрузках.the use of energy of gases and liquids moving at a variable speed, as well as a decrease in flow resistance at high loads.
результат достигается в винте-туроине, состоящей из снабженных лопастями. Детали установлены на оси, параллельной направлению движения жидкости или газа. Первая деталь закреплена неподвижно на оси, остальные детали установлены на оси с возможностью поворота в пределах, определенных ограничителями, установленными на смежных деталях, последняя деталь соединена с осью пружинным механизмом. Смежные детали, могут быть соединены пружинными механизмами. Кроме тoгoэ каждая деталь, подвижная относительно оси, может быть соединена с осью пружинным механизмом. Ограничители могут быть выполнены в виде шипа и паза или в виде амортизатора.the result is achieved in a screw-turoin, consisting of supplied with blades. Parts are mounted on an axis parallel to the direction fluid or gas movements. The first part is fixed motionless on the axis, the remaining parts are mounted on the axis with the possibility of rotation within the limits determined by the limiters mounted on adjacent parts, the last part is connected to the axis by a spring mechanism. Adjacent parts can be connected by spring mechanisms. Furthermore togo e each item, movable relative to the axis, it may be coupled with the axis of the spring mechanism. Limiters can be made in the form of a spike and groove or in the form of a shock absorber.
1 - 4 последовательность сборки четырех деталей с лопастями на оси с одним1 - 4 assembly sequence of four parts with blades on an axis with one
|шг. 5 - 8 последовательность перекрытия лопастей деталей под действием потока; [ϋиг. 9-12 последовательность сборки четырёх деталей с использованием амортизаторов| shg. 5 - 8 sequence of overlapping of the blades of parts under the action of flow; [ig. 9-12 assembly sequence of four parts using shock absorbers
1 (фиг. 1), детали В, С, D (фиг. 2, 3, 4) установлены на оси 1 с возможностью поворота. Все детали снабжены ограничетелями (поворота), которые выполнены в виде шипа 2 и паза 3 на смежных деталях (на первой детали паз 3 может отсутствовать, на фиг. 1 деталь А выполнена без паза 3), таким образом, что шип 2 детали А совмещается с прорезью 3 детали B5 при этом, в крайнем положении шипа в пазе, лопасти детали В совмещаются с лопастями детали А, и далее, лопасти детали С с лопастями детали В и лопасти детали D с лопастями детали С.1 (Fig. 1), parts B, C, D (Fig. 2, 3, 4) are mounted on the axis 1 with the possibility of rotation. All parts are equipped with limiters (rotation), which are made in the form of a spike 2 and a groove 3 on adjacent parts (on the first part, a groove 3 may be absent, in Fig. 1, part A is made without groove 3), so that the spike 2 of part A is aligned with a slot 3 of part B 5, in this case, in the extreme position of the tenon in the groove, the blades of part B are aligned with the blades of part A, and further, the blades of part C with the blades of part B and the blades of part D with the blades of part C.
Для уменьшения колебаний в винте-турбине, ограничители могут быть выполнены в виде амортизаторов 5 (фиг. 9-11), установленных на смежных деталях.To reduce fluctuations in the turbine screw, the limiters can be made in the form of shock absorbers 5 (Fig. 9-11) mounted on adjacent parts.
Пружинный механизм 4 может быть выполнен в виде спиральной пружины (фиг. 4), закрепленной на оси 1 и на последней детали D. Пружинный механизм 4 (далее, пружина 4) создаёт натяжение таким образом, чтобы лопасти всех деталей при отсутсвии потока или слабом потоке жидкости или газа были полностью расправлены. Каждая из подвижных относительно оси 1 деталь (B5 С, D) может быть соединена пружиной 4 с осью. Смежные детали, могут быть соединены пружиннымиThe spring mechanism 4 can be made in the form of a spiral spring (Fig. 4), fixed on the axis 1 and on the last part D. The spring mechanism 4 (hereinafter, the spring 4) creates tension so that the blades of all parts in the absence of flow or low flow liquid or gas were completely straightened. Each of the parts moving relative to axis 1 (B 5 C, D) can be connected by a spring 4 to the axis. Adjacent parts can be spring-loaded
Винт-турбина работает следующим образом.The screw turbine operates as follows.
Если на винт-турбину направить слабый поток жидкости или газа, все лопасти будут полностью расправлены (фиг. 5). Когда сила потока увеличится на столько, чтобы лопасти деталей B5 C5 D преодолели сопротивление пружины 4, детали B5 С, D повернутся на угол относительно неподвижной детали А, соответствующий одному пазу (на фиг. 5-85 поворот происходит против часовой стрелки) и лопасти детали В закроют лопасти детали А (фиг. 6). Следующий поворот детали С и D сделают (фиг. 7), когда сила потока возрастёт примерно в 1,5 раза. Увеличив силу ещё вдвое, поток сложит винт-турбину в двухлопастной винт (фиг. 8). В сложенном виде, лопасти опираются друг на друга и имеют меньшую рабочую площадь, чем обеспечивается повышенная прочность. При ослаблении воздушного потока пружина 4 раскроет лопасти в обратной последовательности. В этом варианте исполнения винт-турбины возможны лишь незначительные колебания лопастей в момент, когда сила потока начала складывать лопасти и шип 2 не находится в крайних положениях паза 3.If a weak flow of liquid or gas is directed to the screw-turbine, all the blades will be completely straightened (Fig. 5). When the flow force increases so much that the blades of the parts B 5 C 5 D overcome the resistance of the spring 4, the parts B 5 C, D will rotate an angle relative to the stationary part A, corresponding to one groove (in Figs. 5-8 5, the rotation is counterclockwise ) and the blades of part B will close the blades of part A (Fig. 6). The next turn of part C and D will be done (Fig. 7) when the flow force increases by about 1.5 times. Having increased the force by a factor of two, the flow will fold the turbine screw into a two-blade screw (Fig. 8). When folded, the blades are supported by each other and have a smaller working area, which provides increased strength. When weakening the air flow, the spring 4 will open the blades in the reverse order. In this embodiment of the screw-turbine, only slight fluctuations of the blades are possible at the moment when the flow force begins to fold the blades and the spike 2 is not in the extreme positions of the groove 3.
соединения шип-паз, можно использовать амортизаторы 5 (фиг. 9-12), которые крепятся к смежным деталям и в крайних положениях обеспечивают сложение лопастей или полное раскрытие винт-турбины, причём сложение происходит беспрепятственно, а раскрытие - с сопротивлением (замедленно).spike-groove connections, shock absorbers 5 can be used (Fig. 9-12), which are attached to adjacent parts and in extreme positions provide the addition of the blades or the full opening of the screw-turbine, moreover, the folding takes place without hindrance, and the opening with resistance (slow).
На фиг. 4 показан пример винт-турбины с восемью лопастями из четырёх 2-х лопастных деталей, однако деталей с лопастями и самих лопастей может быть разное количество, в зависимости от целесообразности. Для того, чтобы шипы 2 и пазы 3 смежных деталей обеспечивали полное перекрытие или максимальную рабочую площадь лопастей в крайних положениях шипов в пaзax5 пара шип — паз на каждой следующей детали выполнены с возможностью поворота на необходимый угол относительно предыдущей детали (в представленном примере этот угол составляет 45 Соединение каждой детали (кроме первой детали А) пружинами 4 разной упругости с осью 1 или со смежными деталями позволяет управлять сложением лопастей разных деталей при определённой силе ветра, что упрощает процесс регулировки установки.In FIG. 4 shows an example of a screw-turbine with eight blades from four 2-blade parts, however, there can be a different number of parts with blades and the blades themselves, depending on the feasibility. In order for the studs 2 and grooves 3 of the adjacent parts to provide complete overlap or maximum working area of the blades in the extreme positions of the studs in groove 5, the pair of stud-grooves on each next part is made with the possibility of rotation by the required angle relative to the previous part (in the example presented, this angle is 45 The connection of each part (except the first part A) with springs 4 of different elasticity with axis 1 or with adjacent parts allows you to control the addition of blades of different parts with a certain wind force, which simplifies the process of adjusting the installation.
Винт-турбина при использовании его в ветроэнергетике поможет увеличить ветроустановки. Учитывая, что обычно скорость ветра бывает 5-10 ветроустановка выходит на максимальную энергоотдачу при 15 м/с, то выработка электроэнергии ветроэлектростанцией может увеличиться в несколько раз.A screw turbine when used in wind energy will help increase wind turbines. Given that usually the wind speed is 5-10, the wind turbine reaches its maximum energy output at 15 m / s, then the generation of electricity by a wind farm can increase several times.
винта-тутроины в screw bolts in

Claims

Фωрмула шзωSретшшшFormula shzωSretshshsh
L Винт-турбина состоит из деталей, снабженных лопастями, детали установлены на оси, параллельной направлению движения жидкости или газа, первая деталь закреплена неподвижно на оси, остальные детали установлены на оси с возможностью поворота в пределах, определенных ограничителями, установленными на смежных деталях, последняя деталь соединена с осью пружинным механизмом.L A turbine screw consists of parts equipped with blades, the parts are mounted on an axis parallel to the direction of movement of the liquid or gas, the first part is fixedly mounted on the axis, the remaining parts are mounted on the axis with the possibility of rotation within the limits defined by the stops installed on adjacent parts, the last the part is connected to the axis by a spring mechanism.
2. Винт-турбина, по п. 1, отличающаяся тем, что ограничители выполнены в виде шипа и паза.2. The screw-turbine, according to claim 1, characterized in that the stops are made in the form of a spike and a groove.
3. Винт-турбина, по п. 1, отличающаяся тем, что ограничители выполнены в виде3. The screw-turbine according to claim 1, characterized in that the limiters are made in the form
4. Винт-турбина, по п. I5 отличающаяся тем, что смежные детали с лопастями,4. The screw-turbine, according to p. I 5 characterized in that the adjacent parts with blades,
Винт-турбина, по п.l, отличающаяся тем, что каждая подвижная относительно оси механизмом с осью. A screw turbine according to claim 1, characterized in that each is movable relative to the axis by a mechanism with an axis.
PCT/RU2007/000050 2006-02-20 2007-02-02 Screw turbine WO2007097659A1 (en)

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RU2006105243 2006-02-20
RU2006105243/06A RU2330966C2 (en) 2006-02-20 2006-02-20 Screw-turbine

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GB2461265A (en) * 2008-06-23 2009-12-30 Tidal Energy Ltd Tidal turbine with limited axial thrust
EP2220363A1 (en) * 2007-11-16 2010-08-25 Elemental Energy Technologies Limited A power generator
GB2476509A (en) * 2009-12-24 2011-06-29 Rolls Royce Plc Turbine with reduced thrust coefficient at excessive speed
NL2009233C2 (en) * 2012-07-26 2014-01-28 Herman Jan Jongejan SCREW, SCREW PART AND METHOD FOR THIS.
US9541060B1 (en) * 2013-05-31 2017-01-10 Ben L. DeJesus Windmill blade assembly
CN111102015A (en) * 2019-12-31 2020-05-05 中北大学 Speed-limiting protection device for turbine generator blade

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SU6875A1 (en) * 1927-03-17 1928-10-31 В.А. Барановский Impeller for vertical wind engines
SU16619A1 (en) * 1929-02-04 1930-08-31 В.Н. Зверев Wind engine
US2619318A (en) * 1946-06-07 1952-11-25 Sulzer Ag Turbomachine rotor
US3032119A (en) * 1959-05-20 1962-05-01 Hachmann Hans Wind power plant

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Publication number Priority date Publication date Assignee Title
EP2220363A1 (en) * 2007-11-16 2010-08-25 Elemental Energy Technologies Limited A power generator
EP2220363A4 (en) * 2007-11-16 2014-01-01 Elemental Energy Technologies Ltd A power generator
US8853873B2 (en) 2007-11-16 2014-10-07 Elemental Energy Technologies Ltd. Power generator
GB2461265A (en) * 2008-06-23 2009-12-30 Tidal Energy Ltd Tidal turbine with limited axial thrust
GB2476509A (en) * 2009-12-24 2011-06-29 Rolls Royce Plc Turbine with reduced thrust coefficient at excessive speed
NL2009233C2 (en) * 2012-07-26 2014-01-28 Herman Jan Jongejan SCREW, SCREW PART AND METHOD FOR THIS.
WO2014017914A1 (en) * 2012-07-26 2014-01-30 Jongejan Herman Jan Screw, screw part and method therefor
US9541060B1 (en) * 2013-05-31 2017-01-10 Ben L. DeJesus Windmill blade assembly
CN111102015A (en) * 2019-12-31 2020-05-05 中北大学 Speed-limiting protection device for turbine generator blade

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RU2006105243A (en) 2007-09-20

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