WO2019014873A1 - Propeller for dredger - Google Patents
Propeller for dredger Download PDFInfo
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- 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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- blade root
- segment
- hub
- propeller
- airfoil
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- 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.
Abstract
Disclosed is a propeller for a dredger, the propeller comprising a gearbox (1) connected to a hull, and a propeller hub (2) rotationally arranged on the gearbox (1), wherein the outer circumference of the propeller hub (2) is provided with a plurality of blades (20), each blade (20) comprising a blade root segment (25) and a blade tip segment (26); an upper surface (21) of the blade root segment (25) is formed with a convex arc-shaped portion (251), and an upper surface (21) of the blade tip segment (26) is formed with an upper convex arc-shaped portion (261); and an end portion of the propeller hub (2) is provided with a hub cap (5), a plurality of fins (51) are uniformly distributed on the hub cap (5) along the periphery thereof, and an end portion of each fin (51) is provided with an end plate (52). By means of the invention, the cavitation problem can be solved, the hub vortex cavitation can be reduced and the cavitation phenomenon of a rudder can also be reduced.
Description
本发明涉及螺旋桨，尤其涉及一种挖泥船用螺旋桨。The present invention relates to a propeller, and more particularly to a propeller for a dredger.
一般高速船舶的螺旋桨以斜轴设置，由于螺旋桨处于斜轴状态，使得螺旋桨入流除了轴向入流，还包括垂向方向的速度分量，因而让螺旋桨运转时产生垂向力，导致处于斜轴状况的螺旋桨存在有较平轴螺旋桨更容易发生叶片空蚀的问题，造成螺旋桨寿命大减。Generally, 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.
此外，当螺旋桨旋转时，在螺旋桨的桨毂的后面产生了强的毂涡空化。毂涡空化的集中会降低船舶螺旋桨的效率，并且引起螺旋桨处的振动和噪音。此外，毂涡空化的集中可能会在船舵处引起空蚀。In addition, strong hub vortexing occurs behind the hub of the propeller as the propeller rotates. The concentration of hub vortex cavitation reduces the efficiency of the ship's propeller and causes vibration and noise at the propeller. In addition, the concentration of hub vortex cavitation may cause cavitation at the rudder.
发明内容Summary of the invention
本发明的目的是在于提供一种挖泥船用螺旋桨，解决上述现有技术问题中的一个或者多个。It is an object of the present invention to provide a propeller for a dredger that addresses one or more of the above prior art problems.
根据本发明的一个方面，提供一种挖泥船用螺旋桨，包括与船体连接的齿轮箱，转动设置在齿轮箱上的桨毂，桨毂的外环周设有多个叶片，每个叶片包括叶根段及叶尖段，叶根段的上表面形成有凸弧部，凸弧部由叶根段的翼型前缘延伸至叶根段的翼型后缘而横跨叶根段，叶根段的下表面形成有平滑部，且于叶根段的翼型前缘形成有第一尖锐导缘，叶根段的翼型后缘形成有第二尖锐导缘；叶尖段的上表面形成有上凸弧部，上凸弧部由叶尖段的翼型前缘延伸至叶尖段的翼型后缘而横跨叶尖段，叶尖段的下表面形成有下凹弧部，使叶尖段呈弧形翼型结构；桨毂远离齿轮箱的端部设有毂帽，毂帽沿周边均布有多个鳍，鳍以螺旋形式沿着毂帽的周边设置，每个鳍的端部均设置有端板，端板与鳍之间形成T形结构，鳍靠近齿轮箱的一边侧的高度小于鳍远离齿轮箱的一边侧的高度。According to an aspect of the invention, a dredger propeller is provided, 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 formed with a concave arc portion The tip end section has an arc-shaped airfoil structure; the end of the hub away from the gear box is provided with a hub cap, and the hub cap is uniformly provided with a plurality of fins along the periphery, and the fins are arranged in a spiral form along the periphery of the hub cap, each fin The end portions are provided with end plates, and the end plates and the fins form a T-shaped structure, and the height of the fins near one side of the gear box is smaller than the fins away from the gear box The height of one side of the side.
本发明通过通过叶根段产生稳定片状空泡而不易发生空蚀，并通过叶尖段提升叶片的作动效率，解决空蚀问题，并维持高效率推进性能；此外，还能够降低毂涡空化和减少船舵的空蚀现象，鳍可以带来除螺旋桨的推进之外的辅助的推进，从而进一步提高了推进效率。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.
图1是本发明一种挖泥船用螺旋桨的结构示意图；1 is a schematic structural view of a propeller for a dredger according to the present invention;
图2是本发明一种挖泥船用螺旋桨的叶片的结构示意图；2 is a schematic structural view of a blade of a propeller for a dredger according to the present invention;
图3是图2的A-A剖视图；Figure 3 is a cross-sectional view taken along line A-A of Figure 2;
图4是图2的B-B剖视图；Figure 4 is a cross-sectional view taken along line B-B of Figure 2;
图5是本发明一种挖泥船用螺旋桨的鳍的结构示意图。Fig. 5 is a structural schematic view showing the fin of a propeller for a dredger according to the present invention.
下面结合附图说明，对本发明作进一步详细说明。The present invention will be further described in detail below with reference to the accompanying drawings.
如图1-5所示，一种挖泥船用螺旋桨，包括与船体连接的齿轮箱1，通过转轴转动设置在齿轮箱1上的桨毂2，桨毂2的外环周设有多个叶片20，并均匀分布，且沿桨毂2的外环周以弧状延伸设置。在本实施例中，叶片20的数量为四个，每个叶片20均呈扇状。叶片20具有上表面21及下表面22，上表面21与下表面22的前半段交接处系形成有翼型前缘23；上表面21与下表面22的后半段交接处形成有翼型后缘24。As shown in FIG. 1-5, 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. In the present embodiment, 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.
其中，叶片20沿桨毂2的径向朝远离桨毂2的方向划分有叶根段25及叶尖段26。叶根段25及叶尖段26为相异的翼型结构，并沿桨毂2的径向方向相组合。在本实施例中，叶根段25的上表面21由翼型前缘23朝翼型后缘24方向形成有凸弧部251；且凸弧部251由叶根段25的翼型前缘23延伸至叶根段25的翼型后缘24，而横跨叶根段25。叶根段25的下表面22由翼型前缘23朝翼型后缘24方向形成有平滑部252，且平滑部252由叶根段25的翼型前缘23延伸至叶根段25的翼型后缘24，而横跨叶根段25，且于翼型前缘23形成有第一尖锐导缘231，翼型后缘24形成有第二尖锐导缘241。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. In the present embodiment, 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.
叶尖段26的上表面21由翼型前缘23朝翼型后缘24得到方向形成有上凸弧部261，且上凸弧部261由叶尖段26的翼型前缘23延伸至叶尖段26的翼型后缘24，而横跨叶尖段26，叶尖段26的下表面22由翼型前缘23朝翼型后缘24方向形成有下凹弧部262，且叶尖段26的下表面22于后半段邻近翼型后缘24处还形成有下凸弧部263，使叶尖段26呈流线的弧形翼型结构。翼型前缘23的翼型截面积小于翼型后缘24的翼型截面积。需要说明的是，叶片20的上、下表面22均以大幅度曲率变化连接叶根段25与叶尖段26，使叶根段25与叶尖段26相连接处表面具有圆滑的曲线，避免其连接处形成不规则的表面，此外，叶根段25与叶尖段26间的连接处为极小的区域，可减少对螺旋桨作动时产生影响，让螺旋桨可达到最佳化作动效果。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. It should be noted that 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. In addition, 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. .
实际使用中，当螺旋桨旋转作动时，螺旋桨受力的低压集中于叶根段
25处，由叶根段25上表面21的凸弧部251与叶根段25下表面22的平滑部252使压力回升导致空泡破裂时，空泡可离开螺旋桨表面，令空泡不致打击螺旋桨的表面而造成空蚀现象，进而导致螺旋桨的表面受损。除此之外，翼型前缘23的第一尖锐导缘231与翼型后缘24的第二尖锐导缘241使叶根段25边缘的形状较为尖锐，因此容易发生流体流离，也容易产生片状空化，使叶根段25处可供空化产生稳定片状空泡，当片状空泡弦向延伸较长，也不易在螺旋桨上破裂而发生空蚀，因而可解决螺旋桨的空蚀问题。In actual use, when the propeller rotates, the low pressure of the propeller is concentrated on the blade root segment.
At 25, when the pressure is raised by the convex portion 251 of the upper surface 21 of the blade root segment 25 and the smooth portion 252 of the lower surface 22 of the blade root segment 25, 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. In addition, 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. When 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.
值得一提的是，叶片20的叶尖段26的厚度与叶根段25相比较为轻薄，可有效减低每一叶片20的整体重量，进而降低叶片20至桨毂2的转动力矩，因此当桨毂2开始转动时，叶片20以较快速度进行转动，而提升叶片20的作动效率。It is worth mentioning that 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.
此外，桨毂2远离齿轮箱1的端部设有毂帽5，毂帽5沿周边均布有多个鳍51，鳍51以螺旋形式沿着毂帽5的周边设置，每个鳍51的端部均设置有端板52，端板52与鳍51之间形成T形结构。当螺旋桨旋转时，即使发生了毂涡空化，鳍51的端板52可以解决毂涡空化的集中，从而减少由毂涡空化引起的船舵的空蚀现象。端板52形成在鳍51的端部上，并且端板52起到阻止流体流动的作用，这在鳍51的前(螺旋桨侧)表面与后(船舵侧)表面，即压力面511和吸力面512之间保持了压力差。此外，吸力面512的压降相对减小，并且在压力面511上形成相对较高的压力，从而提高了推进效率。鳍51靠近齿轮箱1的一边侧的高度小于鳍51远离齿轮箱1的一边侧的高度，因此，流体不会从鳍51的外侧进入，而是会在鳍51的表面上移动的同时穿过逐渐增大的区域，从而通过端板52使流体减速。In addition, 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. When the propeller rotates, even if hub vortexing occurs, the end plate 52 of the fin 51 can resolve the concentration of the hub vortex cavitation, thereby reducing the cavitation of the rudder caused by the hub vortex cavitation. 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.
综上所述，本发明还通过叶根段产生稳定片状空泡而不易发生空蚀，并通过叶尖段提升叶片的作动效率，解决空蚀问题，并维持高效率推进性能；此外，还能够降低毂涡空化和减少船舵的空蚀现象，鳍可以带来除螺旋桨的推进之外的辅助的推进，从而进一步提高了推进效率。In summary, 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.
以上所述仅是本发明的一种实施方式，应当指出，对于本领域普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出若干相似的变形和改进，这些也应视为本发明的保护范围之内。
The above is only one embodiment of the present invention, and it should be noted that some similar variations and modifications may be made by those skilled in the art without departing from the inventive concept. It is considered to be within the scope of protection of the present invention.
Claims (1)
- 一种挖泥船用螺旋桨，其特征在于：包括与船体连接的齿轮箱(1)，转动设置在所述齿轮箱(1)上的桨毂(2)，所述桨毂(2)外环周设有多个叶片(20)，每个所述叶片(20)包括叶根段(25)及叶尖段(26)，所述叶根段(25)的上表面形成有凸弧部(251)，所述凸弧部(251)由所述叶根段(25)的翼型前缘延伸至所述叶根段(25)的翼型后缘而横跨所述叶根段(25)，所述叶根段(25)的下表面形成有平滑部(252)，且于所述叶根段(25)的翼型前缘形成有第一尖锐导缘，所述叶根段(25)的翼型后缘形成有第二尖锐导缘；所述叶尖段(26)的上表面形成有上凸弧部(261)，所述上凸弧部(261)由所述叶尖段(26)的翼型前缘延伸至所述叶尖段的翼型后缘而横跨所述叶尖段，所述叶尖段(26)的下表面形成有下凹弧部(262)，使所述叶尖段呈弧形翼型结构；所述桨毂(2)远离所述齿轮箱(1)的端部设有毂帽(5)，所述毂帽(5)沿周边均布有多个鳍(51)，所述鳍(51)以螺旋形式沿着毂帽(5)的周边设置，每个鳍(51)的端部均设置有端板(52)，所述端板(52)与所述鳍(51)之间形成T形结构，所述鳍(51)靠近所述齿轮箱(1)的一边侧的高度小于所述鳍(51)远离齿轮箱(1)的一边侧的高度。 A dredger propeller, characterized by comprising a gearbox (1) connected to a hull, rotating a hub (2) disposed on the gearbox (1), the hub (2) outer circumference A plurality of blades (20) are provided, each of the blades (20) comprising a blade root segment (25) and a tip segment (26), the upper surface of the blade root segment (25) being formed with a convex arc portion (251) The convex arc portion (251) extends from the airfoil leading edge of the blade root segment (25) to the airfoil trailing edge of the blade root segment (25) across the blade root segment (25) The lower surface of the blade root segment (25) is formed with a smooth portion (252), and a first sharp guide edge is formed on the airfoil leading edge of the blade root segment (25), the blade root segment (25) The trailing edge of the airfoil is formed with a second sharp leading edge; the upper surface of the tip segment (26) is formed with an upper convex portion (261) from which the upper convex portion (261) is The airfoil leading edge of (26) extends to the airfoil trailing edge of the tip segment and spans the tip segment, the lower surface of the tip segment (26) being formed with a concave arc (262), Having the tip section an arcuate airfoil structure; the end of the hub (2) remote from the gearbox (1) is provided with a hub cap (5), the hub cap (5) along A plurality of fins (51) are evenly distributed on the sides, the fins (51) are arranged in a spiral form along the periphery of the hub cap (5), and the end portions of each fin (51) are provided with end plates (52). A T-shaped structure is formed between the end plate (52) and the fin (51), and the height of the fin (51) near one side of the gear box (1) is smaller than the fin (51) is far from the gear box ( 1) The height of one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/093532 WO2019014873A1 (en) | 2017-07-19 | 2017-07-19 | Propeller for dredger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/093532 WO2019014873A1 (en) | 2017-07-19 | 2017-07-19 | Propeller for dredger |
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| WO2019014873A1 true WO2019014873A1 (en) | 2019-01-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113320671A (en) * | 2021-06-30 | 2021-08-31 | 中国船舶科学研究中心 | Energy-saving propeller hub cap with notch |
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| CN105711783A (en) * | 2012-09-13 | 2016-06-29 | 现代重工业株式会社 | Propeller hub cap with fins |
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| JPH0789487A (en) * | 1993-09-22 | 1995-04-04 | Japan Hamuwaaji Kk | Propulsion unit for ship |
| US20110182747A1 (en) * | 2008-10-16 | 2011-07-28 | The Penn State Research Foundation | Hub fin device |
| CN103158846A (en) * | 2011-12-09 | 2013-06-19 | 联合船舶设计发展中心 | Full-speed domain propeller unit |
| CN103857589A (en) * | 2012-09-13 | 2014-06-11 | 现代重工业株式会社 | Propeller boss cap comprising fins |
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