EP2562077B1 - Hydraulic propeller thrust enhancement method - Google Patents
Hydraulic propeller thrust enhancement method Download PDFInfo
- Publication number
- EP2562077B1 EP2562077B1 EP20110178735 EP11178735A EP2562077B1 EP 2562077 B1 EP2562077 B1 EP 2562077B1 EP 20110178735 EP20110178735 EP 20110178735 EP 11178735 A EP11178735 A EP 11178735A EP 2562077 B1 EP2562077 B1 EP 2562077B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- propeller
- hydraulic propeller
- nozzle
- guide pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H11/00—Marine propulsion by water jets
- B63H11/12—Marine propulsion by water jets the propulsive medium being steam or other gas
Definitions
- the present invention relates to hydraulic propeller technology and more particularly, to a hydraulic propeller enhancement method for enhancing the propelling force of a hydraulic propeller by means of the application of a gas.
- a conventional method for enhancing the propelling force of a hydraulic propeller is known by: increasing the horsepower of the propeller, using a different design of propeller or transmission system as disclosed in US 3 365 891 , or changing the angle of attach of the propeller.
- FIG. 1 illustrates a conventional hydraulic propeller 10 of a boat 20; the hydraulic propeller 10 comprises a power engine 11, a water passage 12, a propeller 13, a nozzle 14 and a directional nozzle 15.
- FIG. 2 illustrates a flow of water passing through the nozzle 14 of the hydraulic propeller 10. Because only a flow of pure water 141 is driven out of the nozzle 14, the reactive force thus produced is less strong, there is room for improvement.
- the present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a method for enhancing the propelling force of a hydraulic propeller, which provides a gas release outlet in the propeller at the area where the high-speed axial flow of water passes for guiding in a gas by means of a negative pressure subject to Bernoulli's principle.
- a hydraulic propeller enhancement method comprises the step of:
- the at least one gas release outlet is located on the peripheral wall of the water passage for the connection of the at least one guide pipe of the gas guide device; the at least one gas release outlet is located on the peripheral wall of the nozzle for the connection of the at least one guide pipe of the gas guide device.
- the hydraulic propeller further comprises a directional nozzle connected to a distal end of the nozzle; the at least one gas release outlet is located on the peripheral wall of said directional nozzle for the connection of the at least one guide pipe of the gas guide device.
- the propeller comprises an axial tube having an inner end connected to the at least one guide pipe of the gas guide device and an outer end extended to the at least one gas release outlet located on the outer surface of the propeller.
- the gas guide device uses a supplementary measure to guide engine waste gas or low pressure gas from the steam turbine into the at least one guide pipe of the gas guide device from for generating air bubbles.
- the gas guide device further compresses a pressure device for pumping a gas into the at least one guide pipe toward the at least one gas release outlet, the pressure device being selected from an air compressor, an air blower, an engine, a steam turbine and a turbo of the boat.
- the invention uses one single gas guide device and a negative pressure suction force to guide in air bubbles to enhance the propelling force of the hydraulic propeller, saving power consumption and cost.
- a hydraulic propeller enhancement method in accordance with the present invention comprises the steps of:
- the aforesaid technical measure for enabling the hydraulic propeller to guide in outside air for generating air bubbles 60 can be achieved simply by providing the at least one gas release outlet 40 in the hydraulic propeller 30 in the area where the high-speed flow of water passes without using any power, and therefore this method saves energy and cost.
- a pressure is necessary drive air into the hydraulic propeller 30 for generating air bubbles 60, a small power consumption can achieve a high effect.
- a supplementary measure may be employed to guide air or gas into the at least one guide pipe 51 of the gas guide device 50 , for example, engine waste gas or low pressure gas from the steam turbine may be guided into the at least one guide pipe 51 of the gas guide device 50 for generating air bubbles 60 .
- This waste gas recycling method does not require any extra resource or cost.
- a pressure device 70 and a control valve 71 may be used in the at least one guide pipe 51 of the gas guide device 50 for pumping a gas into the at least one guide pipe 51 toward the at least one gas release outlet 40 .
- the pressure device 70 can be the existing air compressor, air blower, engine, steam turbine or turbo of the boat 20 . Thus, using a small power can obtain multiple times of power.
- the invention uses one single gas guide device and a negative pressure suction force to guide in air bubbles to enhance the propelling force of the hydraulic propeller, saving power consumption and cost.
Description
- The present invention relates to hydraulic propeller technology and more particularly, to a hydraulic propeller enhancement method for enhancing the propelling force of a hydraulic propeller by means of the application of a gas.
- A conventional method for enhancing the propelling force of a hydraulic propeller is known by: increasing the horsepower of the propeller, using a different design of propeller or transmission system as disclosed in
US 3 365 891 , or changing the angle of attach of the propeller. -
FIG. 1 illustrates a conventionalhydraulic propeller 10 of aboat 20; thehydraulic propeller 10 comprises apower engine 11, awater passage 12, apropeller 13, anozzle 14 and adirectional nozzle 15.FIG. 2 illustrates a flow of water passing through thenozzle 14 of thehydraulic propeller 10. Because only a flow ofpure water 141 is driven out of thenozzle 14, the reactive force thus produced is less strong, there is room for improvement. - To improve the performance of the aforesaid hydraulic propeller, a complicated design or a change of the structural details of the propeller may be necessary. However, it costs a lot to improve the performance of the hydraulic propeller in this manner.
- Therefore, it is desirable to provide a method for enhancing the propelling force of a hydraulic propeller and improving its performance and reducing its fuel consumption.
- The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a method for enhancing the propelling force of a hydraulic propeller, which provides a gas release outlet in the propeller at the area where the high-speed axial flow of water passes for guiding in a gas by means of a negative pressure subject to Bernoulli's principle.
- To achieve the main object, a hydraulic propeller enhancement method comprises the step of:
- a) providing a boat and then installing a hydraulic propeller in the boat, wherein the hydraulic propeller comprises a power engine, a water passage, a propeller rotatably accommodated in the water passage and rotatable by the power engine to cause a high-speed axial flow of water, a nozzle located on an outlet of the water passage and terminating in a contracted end piece;
- b) installing at least one gas release outlet in the hydraulic propeller at a selected area the high-speed axial flow of water passes;
- c) providing a gas guide device comprising at least one guide pipe arranged at a selection location in the boat and connecting a bottom end of the at least one guide pipe to the at least one gas release outlet;
- d) employing said hydraulic propeller within said high-speed axial flow of water passing through said at least one gas release outlet, due to Bernoulli's principle, said high-speed axial flow of water enables pressure around said at least one gas release outlet rapidly decreased to form a negative pressure for sucking outside air into a gas inlet located on the top end of said at least one guide pipe during rotation of said propeller ;
- e) employing said negative pressure to suck in outside air which is to be guided by said at least one guide pipe into said at least one gas release outlet to mix with water and to produce air bubbles; and
- f) subject to compressible gas characteristic, the air bubbles thus produced pass through the contracted end piece of the nozzle are compressed to reduce the size, and the compressed air bubbles expand suddenly subject to a pressure difference between the inside of said contracted end piece and the outside of the nozzle when going out of the nozzle, thereby enhancing the propelling force of the hydraulic propeller.
- The at least one gas release outlet is located on the peripheral wall of the water passage for the connection of the at least one guide pipe of the gas guide device; the at least one gas release outlet is located on the peripheral wall of the nozzle for the connection of the at least one guide pipe of the gas guide device.
- The hydraulic propeller further comprises a directional nozzle connected to a distal end of the nozzle; the at least one gas release outlet is located on the peripheral wall of said directional nozzle for the connection of the at least one guide pipe of the gas guide device.
- Moreover, the propeller comprises an axial tube having an inner end connected to the at least one guide pipe of the gas guide device and an outer end extended to the at least one gas release outlet located on the outer surface of the propeller.
- Besides, the gas guide device uses a supplementary measure to guide engine waste gas or low pressure gas from the steam turbine into the at least one guide pipe of the gas guide device from for generating air bubbles.
- The gas guide device further compresses a pressure device for pumping a gas into the at least one guide pipe toward the at least one gas release outlet, the pressure device being selected from an air compressor, an air blower, an engine, a steam turbine and a turbo of the boat.
- Thus, subject to Bernoulli's principle, gas compressible characteristic and Boyle's law and the arrangement of the contracted end piece of the nozzle to work as an air compressor for compressing air bubbles, the invention uses one single gas guide device and a negative pressure suction force to guide in air bubbles to enhance the propelling force of the hydraulic propeller, saving power consumption and cost.
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FIG. 1 is a schematic drawing of a hydraulic propeller according to the prior art. -
FIG. 2 is a schematic drawing illustrating flows of water driven out of the nozzle of the hydraulic propeller according to the prior art. -
FIG. 3 is a schematic drawing illustrating air bubbles generated in a nozzle of a hydraulic propeller in accordance with the present invention. -
FIG. 4 is a schematic drawing illustrating a gas guided into the hydraulic propeller in accordance with the present invention. -
FIG. 5 is a sectional view taken in an enlarged scale line 5-5 ofFIG. 4 . -
FIG. 6 corresponds toFIG. 5 , illustrating air bubbles generated in the negative pressure zone. - Further features and benefits of the present invention will be apparent from the following detailed description of the preferred embodiment taken in conjunction with the annexed drawings. However, it is to be understood that the invention is applicable to any of a variety of boats. The present preferred embodiment is simply an example but not a limitation.
- Referring to
FIG. 3 , when compared to the prior art design shown inFIG. 2 in which only a flow of pure water is driven out of the nozzle,multiple air bubbles 60 are generated in the flow ofwater 141 that is driven out of the nozzle of the hydraulic propeller. - Referring to
FIGS. 3 to 5 , a hydraulic propeller enhancement method in accordance with the present invention comprises the steps of: - a) providing a
boat 20 in any type or shape, and then installing ahydraulic propeller 30 in theboat 20, wherein thehydraulic propeller 30 comprises apower engine 31, awater passage 33, apropeller 32 rotatably accommodated in thewater passage 33 and rotatable by thepower engine 31 to cause a high-speed axial flow of water F, as shown inFIGS. 5 and6 , anozzle 34 located on the-outlet of thewater passage 33 and terminating in a contractedend piece 341 and then anoutlet 342, and adirectional nozzle 35 connected to theoutlet 342 of the nozzle 34 (thepropeller 30 of the known art, no further detailed description in this regard is necessary); - b) installing at least one
gas release outlet 40 in thehydraulic propeller 30 at thewater passage 33, thenozzle 34, thedirectional nozzle 35 or any location where the high-speed axial flow of water F passes, and attaching anaxial tube 321 to thepropeller 32 to connect aninner end 322 of theaxial tube 321 to at least onegas pipe 51 and to have the at least onegas release outlet 40 be formed in each of the aforesaid four components, as shown inFIGS. 5 and6 , or in theouter end 342 of theaxial tube 321 where the velocity of the flow ofwater 141 is high, wherein eachgas release outlet 40 can made in, but not limited to, circular shape, and backwardly inclined or perpendicular to the tube wall for causing a suction force of negative pressure upon passing of a high-speed of water; - c) providing a
gas guide device 50, which, as shown inFIG. 4 , comprises the at least oneguide pipe 51 arranged at a selection location in theboat 20 above the water line WL and connected with the bottom end thereof to the at least onegas release outlet 40 at thewater passage 33 and/or thenozzle 34 and/or thedirectional nozzle 35 or theaxial tube 321 of thepropeller 32 subject to type of the board or actual requirements; - d) employing the
hydraulic propeller 30 within the high-speed axial flow of water F passing through the at least onegas release outlet 40, due to Bernoulli's principle, the high-speed axial flow of water F enables pressure around the at least onegas release outlet 40 rapidly decreased to form a negative pressure for sucking outside air into agas inlet 52 located on the top end of the at least oneguide pipe 51 during rotation of thepropeller 32 without power consumption to save energy consumption; - e) employing said negative pressure to suck in outside air which is to be guided by said at least one
guide pipe 51 into said at least onegas release outlet 40 to mix with water and to produceair bubbles 60; and - f) subject to compressible gas characteristic, the
air bubbles 60 are compressed to reduce the size when passing through the contractedend piece 341 of thenozzle 34, and thecompressed air bubbles 60 expand suddenly subject to a pressure difference between the inside of the contractedend piece 341 and the outside of thenozzle 34 when they go out of thenozzle 34, enhancing the propelling force of thehydraulic propeller 30. - In other words, when the high-speed axial flow of water F propelled by the
propeller 32 passes through the contractedend piece 341 of thenozzle 34, it flowing speed is accelerated, and the pressure at the orifice of thenozzle 34 is relatively increased. Theair bubbles 60 that are sucked into the at least onegas release outlet 40 are small-sized due to compression. When thecompressed air bubbles 60 move with the flow of water to theouter end 342 of theaxial tube 321, the surrounding water pressure is reduced, and therefore, thecompressed air bubbles 60 expand suddenly, as shown inFIG. 3 , enhancing the reactive force of the axial flow of water F, and therefore, the invention greatly increases the propelling force of the hydraulic propeller, i.e., the technical measure of the present invention utilizes: - 1. Bernoulli's principle: a high-speed flow causes generation of a negative pressure therearound.
- 2. Gas compressible characteristic and Boyle's law: the volume of gas is indirectly proportional to the applied pressure, i.e., P1 V 1=P2 V2; when increasing the pressure, the volume is reduced, or when reducing the pressure, the volume is increased. For example, 2P11V1=1P22V2.
- 3. Air compressor: water is not compressible, however it becomes compressible when contains
air bubbles 60; the contractedend piece 341 of thenozzle 34 works as an air compressor for compressing theair bubbles 60 passing therethrough. - The aforesaid technical measure for enabling the hydraulic propeller to guide in outside air for generating
air bubbles 60 can be achieved simply by providing the at least onegas release outlet 40 in thehydraulic propeller 30 in the area where the high-speed flow of water passes without using any power, and therefore this method saves energy and cost. When a pressure is necessary drive air into thehydraulic propeller 30 for generatingair bubbles 60, a small power consumption can achieve a high effect. - Referring to
FIG. 4 , a supplementary measure may be employed to guide air or gas into the at least oneguide pipe 51 of thegas guide device 50, for example, engine waste gas or low pressure gas from the steam turbine may be guided into the at least oneguide pipe 51 of thegas guide device 50 for generatingair bubbles 60. This waste gas recycling method does not require any extra resource or cost. Further, apressure device 70 and acontrol valve 71 may be used in the at least oneguide pipe 51 of thegas guide device 50 for pumping a gas into the at least oneguide pipe 51 toward the at least onegas release outlet 40. Thepressure device 70 can be the existing air compressor, air blower, engine, steam turbine or turbo of theboat 20. Thus, using a small power can obtain multiple times of power. - In conclusion, subject to Bernoulli's principle, gas compressible characteristic and Boyle's law and the arrangement of the contracted end piece of the nozzle to work as an air compressor for compressing air bubbles, the invention uses one single gas guide device and a negative pressure suction force to guide in air bubbles to enhance the propelling force of the hydraulic propeller, saving power consumption and cost.
- Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the scope of the claims. Accordingly, the invention is not to be limited except as by the appended claims.
Claims (8)
- A hydraulic propeller enhancement method, comprising the step of:a) providing a boat (20) and then installing a hydraulic propeller (30) in said boat (20), wherein said hydraulic propeller (30) comprises a power engine (31), a water passage (33), a propeller (32) rotatably accommodated in said water passage (33) and rotatable by said power engine (31) to cause a high-speed axial flow of water (F), a nozzle (34) located on an outlet (342) of said water passage (33) and terminating in a contracted end piece (341);b) installing at least one gas release outlet (40) in said hydraulic propeller (30) at a selected area said high-speed axial flow of water (F) passes;c) providing a gas guide device (50) comprising at least one guide pipe (51) arranged at a selected location in said boat (20) and connecting a bottom end of said at least one guide pipe (51) to said at least one gas release outlet (40);d) employing said hydraulic propeller (30) within said high-speed axial flow of water (F) passing through said at least one gas release outlet (40), due to the Bernoulli's principle, said high-speed axial flow of water (F) enables pressure around said at least one gas release outlet (40) rapidly decreased to form a negative pressure for sucking outside air into a gas inlet (52) located on the top end of said at least one guide pipe (51) during rotation of said propeller (32);e) employing said negative pressure to suck in outside air which is to be guided by said at least one guide pipe (51) into said at least one gas release outlet (40) to mix with water and to produce air bubbles (60); andf) subject to compressible gas characteristic, the air bubbles (60) thus produced pass through said contracted end piece (341) of said nozzle (34) are compressed to reduce the size, and the compressed air bubbles (60) expand suddenly subject to a pressure difference between the inside of said contracted end piece (341) and the outside of said nozzle (34) when going out of said nozzle (34), thereby enhancing the propelling force of said hydraulic propeller (30).
- The hydraulic propeller enhancement method as claimed in claim 1, wherein said at least one gas release outlet (40) is located on the peripheral wall of said water passage (33) for the connection of said at least one guide pipe (51) of said gas guide device (50).
- The hydraulic propeller enhancement method as claimed in claim 1, wherein said at least one gas release outlet (40) is located on the peripheral wall of said nozzle (34) for the connection of said at least one guide pipe (51) of said gas guide device (50).
- The hydraulic propeller enhancement method as claimed in claim 1, wherein said hydraulic propeller (30) further comprises a directional nozzle (35) connected to a distal end of said nozzle (34); said at least one gas release outlet (40) is located on the peripheral wall of said directional nozzle (35) for the connection of said at least one guide pipe (51) of said gas guide device (50).
- The hydraulic propeller enhancement method as claimed in claim 1, wherein said propeller (32) comprises an axial tube (321) having an inner end (322) connected to said at least one guide pipe (51) of said gas guide device (50) and an outer end extended to said at least one gas release outlet (40) located on the outer surface of said propeller (32).
- The hydraulic propeller enhancement method as claimed in claim 1, wherein said at least one guide pipe (51) of said gas guide device (50) has a top end thereof terminating in said gas inlet (52) and disposed in said boat (20) above the water line.
- The hydraulic propeller enhancement method as claimed in claim 6, wherein said gas guide device (50) uses a supplementary measure to guide engine waste gas or low pressure gas from the steam turbine into said at least one guide pipe (51) of said gas guide device (50) for generating air bubbles (60).
- The hydraulic propeller enhancement method as claimed in claim 7, wherein said gas guide device (50) further compresses a pressure device (70) for pumping a gas into said at least one guide pipe (51) toward said at least one gas release outlet (40), said pressure device (70) being selected from an air compressor, an air blower, an engine, a steam turbine and a turbo of said boat (20).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK11178735T DK2562077T3 (en) | 2011-08-24 | 2011-08-24 | A process for increasing the hydraulic power propeller |
EP20110178735 EP2562077B1 (en) | 2011-08-24 | 2011-08-24 | Hydraulic propeller thrust enhancement method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20110178735 EP2562077B1 (en) | 2011-08-24 | 2011-08-24 | Hydraulic propeller thrust enhancement method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2562077A1 EP2562077A1 (en) | 2013-02-27 |
EP2562077B1 true EP2562077B1 (en) | 2014-01-01 |
Family
ID=44785263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20110178735 Not-in-force EP2562077B1 (en) | 2011-08-24 | 2011-08-24 | Hydraulic propeller thrust enhancement method |
Country Status (2)
Country | Link |
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EP (1) | EP2562077B1 (en) |
DK (1) | DK2562077T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019007157B4 (en) * | 2019-10-15 | 2021-08-12 | Georg Tränkl | Propulsion device for a watercraft |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3365891A (en) * | 1966-08-22 | 1968-01-30 | John M Peterson | Gas thrustor marine engine |
DE19739445A1 (en) * | 1997-09-02 | 1999-03-11 | Juergen Dr Ing Heinig | Structure for generating ship propulsion |
US6168485B1 (en) * | 1999-10-15 | 2001-01-02 | Outboard Marine Corporation | Pump jet with double-walled stator housing for exhaust noise reduction |
-
2011
- 2011-08-24 DK DK11178735T patent/DK2562077T3/en active
- 2011-08-24 EP EP20110178735 patent/EP2562077B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
DK2562077T3 (en) | 2014-03-24 |
EP2562077A1 (en) | 2013-02-27 |
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