WO2019014873A1 - Hélice pour une drague - Google Patents

Hélice pour une drague Download PDF

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Publication number
WO2019014873A1
WO2019014873A1 PCT/CN2017/093532 CN2017093532W WO2019014873A1 WO 2019014873 A1 WO2019014873 A1 WO 2019014873A1 CN 2017093532 W CN2017093532 W CN 2017093532W WO 2019014873 A1 WO2019014873 A1 WO 2019014873A1
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WO
WIPO (PCT)
Prior art keywords
blade root
segment
hub
propeller
airfoil
Prior art date
Application number
PCT/CN2017/093532
Other languages
English (en)
Chinese (zh)
Inventor
陆东美
Original Assignee
陆东美
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 陆东美 filed Critical 陆东美
Priority to PCT/CN2017/093532 priority Critical patent/WO2019014873A1/fr
Publication of WO2019014873A1 publication Critical patent/WO2019014873A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/26—Blades

Definitions

  • the present invention relates to a propeller, and more particularly to a propeller for a dredger.
  • the propeller of a high-speed ship is set to an oblique axis. Since the propeller is in an oblique axis state, the propeller inflow includes a vertical component in addition to the axial inflow, thereby causing a vertical force when the propeller is in operation, resulting in an oblique axis condition. There is a problem that the propeller is more prone to cavitation of the blade than the flat-shaft propeller, resulting in a greatly reduced life of the propeller.
  • hub vortex cavitation reduces the efficiency of the ship's propeller and causes vibration and noise at the propeller.
  • concentration of hub vortex cavitation may cause cavitation at the rudder.
  • a dredger propeller comprising a gearbox coupled to the hull, rotating a hub disposed on the gearbox, the outer circumference of the hub being provided with a plurality of blades, each blade including a blade In the root segment and the tip segment, the upper surface of the blade root segment is formed with a convex arc portion extending from the airfoil leading edge of the blade root segment to the airfoil trailing edge of the blade root segment across the blade root segment, the blade root
  • the lower surface of the segment is formed with a smooth portion, and the airfoil leading edge of the blade root segment is formed with a first sharp leading edge, and the airfoil trailing edge of the blade root segment is formed with a second sharp leading edge;
  • the upper surface of the blade tip segment is formed An upper convex arc portion extending from the airfoil leading edge of the blade tip segment to the airfoil trailing edge of the blade tip segment across the blade tip segment, the lower surface of the blade tip segment being
  • the invention solves the problem of cavitation erosion and maintains high efficiency propulsion performance by generating stable sheet-like cavitation through the blade root segment, and is free from cavitation, and improves the efficiency of the blade by the blade tip segment, and maintains high efficiency propulsion performance; Cavitation and reduction of cavitation in the rudder, the fins can provide auxiliary propulsion in addition to the propulsion of the propeller, thereby further improving the propulsion efficiency.
  • FIG. 1 is a schematic structural view of a propeller for a dredger according to the present invention
  • FIG. 2 is a schematic structural view of a blade of a propeller for a dredger according to the present invention
  • Figure 3 is a cross-sectional view taken along line A-A of Figure 2;
  • Figure 4 is a cross-sectional view taken along line B-B of Figure 2;
  • Fig. 5 is a structural schematic view showing the fin of a propeller for a dredger according to the present invention.
  • a dredger propeller includes a gearbox 1 connected to a hull, and a hub 2 disposed on the gearbox 1 is rotated by a rotating shaft.
  • the outer circumference of the hub 2 is provided with a plurality of blades. 20, and evenly distributed, and extending along the outer circumference of the hub 2 in an arc shape.
  • the number of the blades 20 is four, and each of the blades 20 is fan-shaped.
  • the blade 20 has an upper surface 21 and a lower surface 22, and an airfoil leading edge 23 is formed at the intersection of the upper surface 21 and the front half of the lower surface 22; the airfoil is formed at the intersection of the upper surface 21 and the rear half of the lower surface 22 Edge 24.
  • the blade 20 is divided into a blade root segment 25 and a blade tip segment 26 in a direction away from the hub 2 in the radial direction of the hub 2.
  • the blade root section 25 and the tip section 26 are distinct airfoil structures and are combined in the radial direction of the hub 2.
  • the upper surface 21 of the blade root section 25 is formed with a convex arc portion 251 from the airfoil leading edge 23 toward the airfoil trailing edge 24; and the convex arc portion 251 is formed by the airfoil leading edge 23 of the blade root segment 25. It extends to the airfoil trailing edge 24 of the blade root section 25 and across the blade root section 25.
  • the lower surface 22 of the blade root section 25 is formed with a smooth portion 252 from the airfoil leading edge 23 toward the airfoil trailing edge 24, and the smooth portion 252 extends from the airfoil leading edge 23 of the blade root section 25 to the wing of the blade root section 25.
  • the trailing edge 24 is formed across the blade root section 25, and a first sharp leading edge 231 is formed on the airfoil leading edge 23, and a second sharp leading edge 241 is formed in the airfoil trailing edge 24.
  • the upper surface 21 of the tip section 26 is formed with an upper convex arc portion 261 from the airfoil leading edge 23 toward the airfoil trailing edge 24, and the upper convex arc portion 261 extends from the airfoil leading edge 23 of the tip portion 26 to the leaf.
  • the airfoil trailing edge 24 of the tip section 26, and across the tip section 26, the lower surface 22 of the tip section 26 is formed with a concave arcuate portion 262 from the airfoil leading edge 23 toward the airfoil trailing edge 24, and the tip of the blade
  • the lower surface 22 of the segment 26 is further formed with a lower convex arc portion 263 adjacent the airfoil trailing edge 24 in the second half, such that the tip portion 26 has a streamlined arcuate airfoil structure.
  • the airfoil leading edge 23 has an airfoil cross-sectional area that is less than the airfoil cross-sectional area of the airfoil trailing edge 24.
  • the upper and lower surfaces 22 of the blade 20 are connected to the blade root segment 25 and the tip segment 26 with a large curvature change, so that the surface of the blade root segment 25 and the tip segment 26 have a smooth curve to avoid The joint forms an irregular surface.
  • the connection between the blade root section 25 and the tip section 26 is a very small area, which can reduce the influence on the propeller operation, so that the propeller can achieve an optimal actuation effect. .
  • the low pressure of the propeller is concentrated on the blade root segment.
  • the bubble can leave the surface of the propeller when the bubble collapses, so that the bubble does not hit the propeller
  • the surface causes cavitation, which in turn causes damage to the surface of the propeller.
  • the first sharp leading edge 231 of the airfoil leading edge 23 and the second sharp leading edge 241 of the airfoil trailing edge 24 make the edge of the blade root section 25 sharper in shape, so fluid flow is easily generated and is also prone to occur.
  • the flaky cavitation makes the crust of the blade root segment available for cavitation to produce stable flaky vacuoles.
  • the flaky cavitation extends long, it is not easy to rupture on the propeller and cavitation occurs, thus solving the problem of the propeller. Eclipse problem.
  • the thickness of the tip portion 26 of the blade 20 is lighter and thinner than the blade root portion 25, which can effectively reduce the overall weight of each blade 20, thereby reducing the rotational torque of the blade 20 to the hub 2, thus When the hub 2 starts to rotate, the blade 20 rotates at a relatively fast speed, and the operating efficiency of the blade 20 is improved.
  • the end of the hub 2 away from the gear box 1 is provided with a hub cap 5, which is uniformly distributed along the periphery with a plurality of fins 51 arranged in a spiral form along the periphery of the hub cap 5, each fin 51
  • the end portions are each provided with an end plate 52, and the end plate 52 and the fin 51 form a T-shaped structure.
  • the end plate 52 is formed on the end of the fin 51, and the end plate 52 functions to prevent fluid flow, which is on the front (propeller side) surface and the rear (rudder side) surface of the fin 51, that is, the pressure surface 511 and suction. A pressure differential is maintained between faces 512. Further, the pressure drop of the suction surface 512 is relatively reduced, and a relatively high pressure is formed on the pressure surface 511, thereby improving the propulsion efficiency.
  • the height of the fin 51 near the one side of the gear case 1 is smaller than the height of the fin 51 away from the one side of the gear case 1, and therefore, the fluid does not enter from the outside of the fin 51, but passes through the surface of the fin 51 while moving. The gradually increasing area is thereby decelerated by the end plate 52.
  • the present invention also produces stable sheet-like cavities through the blade root segment, which is less prone to cavitation, and improves the efficiency of the blade by the blade tip section, thereby solving the cavitation problem and maintaining high efficiency propulsion performance; It is also possible to reduce the vortex cavitation of the hub and reduce the cavitation of the rudder, and the fin can provide auxiliary propulsion in addition to the propulsion of the propeller, thereby further improving the propulsion efficiency.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne une hélice pour une drague, l'hélice comprenant une boîte de vitesses (1) reliée à une coque, et un moyeu d'hélice (2) disposé en rotation sur la boîte de vitesses (1), la circonférence externe du moyeu d'hélice (2) étant pourvue d'une pluralité de pales (20), chaque pale (20) comprenant un segment d'emplanture de pale (25) et un segment de bout de pale (26) ; une surface supérieure (21) du segment d'emplanture de pale (25) étant formée avec une partie en forme d'arc convexe (251) et une surface supérieure (21) du segment de bout de pale (26) étant formée avec une partie en forme d'arc convexe supérieure (261) ; et une partie d'extrémité du moyeu d'hélice (2) étant pourvue d'un cache-moyeu (5), une pluralité d'ailettes (51) étant réparties de manière uniforme sur le cache-moyeu (5) le long de sa périphérie, et une partie d'extrémité de chaque ailette (51) étant pourvue d'une plaque d'extrémité (52). Au moyen de l'invention, le problème de cavitation peut être résolu, la cavitation de tourbillon de moyeu peut être réduite et le phénomène de cavitation d'une gouverne de direction peut également être réduit.
PCT/CN2017/093532 2017-07-19 2017-07-19 Hélice pour une drague WO2019014873A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/093532 WO2019014873A1 (fr) 2017-07-19 2017-07-19 Hélice pour une drague

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/093532 WO2019014873A1 (fr) 2017-07-19 2017-07-19 Hélice pour une drague

Publications (1)

Publication Number Publication Date
WO2019014873A1 true WO2019014873A1 (fr) 2019-01-24

Family

ID=65015429

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Application Number Title Priority Date Filing Date
PCT/CN2017/093532 WO2019014873A1 (fr) 2017-07-19 2017-07-19 Hélice pour une drague

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WO (1) WO2019014873A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113320671A (zh) * 2021-06-30 2021-08-31 中国船舶科学研究中心 一种带切口的节能螺旋桨毂帽

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0789487A (ja) * 1993-09-22 1995-04-04 Japan Hamuwaaji Kk 船舶の推進装置
US20110182747A1 (en) * 2008-10-16 2011-07-28 The Penn State Research Foundation Hub fin device
CN103158846A (zh) * 2011-12-09 2013-06-19 联合船舶设计发展中心 全速度域螺桨单元
CN103857589A (zh) * 2012-09-13 2014-06-11 现代重工业株式会社 具有鳍的螺旋桨毂帽
CN204236757U (zh) * 2014-10-22 2015-04-01 江苏新韩通船舶重工有限公司 一种螺旋桨
CN105711783A (zh) * 2012-09-13 2016-06-29 现代重工业株式会社 具有鳍的螺旋桨毂帽

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0789487A (ja) * 1993-09-22 1995-04-04 Japan Hamuwaaji Kk 船舶の推進装置
US20110182747A1 (en) * 2008-10-16 2011-07-28 The Penn State Research Foundation Hub fin device
CN103158846A (zh) * 2011-12-09 2013-06-19 联合船舶设计发展中心 全速度域螺桨单元
CN103857589A (zh) * 2012-09-13 2014-06-11 现代重工业株式会社 具有鳍的螺旋桨毂帽
CN105711783A (zh) * 2012-09-13 2016-06-29 现代重工业株式会社 具有鳍的螺旋桨毂帽
CN204236757U (zh) * 2014-10-22 2015-04-01 江苏新韩通船舶重工有限公司 一种螺旋桨

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113320671A (zh) * 2021-06-30 2021-08-31 中国船舶科学研究中心 一种带切口的节能螺旋桨毂帽

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