CN104859832A - Semi-spade rudder cavitation probability reducing device - Google Patents
Semi-spade rudder cavitation probability reducing device Download PDFInfo
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- CN104859832A CN104859832A CN201510289580.5A CN201510289580A CN104859832A CN 104859832 A CN104859832 A CN 104859832A CN 201510289580 A CN201510289580 A CN 201510289580A CN 104859832 A CN104859832 A CN 104859832A
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- rudder
- flow deflector
- rubber flow
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Abstract
The invention relates to a semi-spade rudder cavitation probability reducing device. The semi-spade rudder cavitation probability reducing device comprises at least two upper flow guiding devices fixed on upper part positions of a spade rudder arm and at least two lower flow guiding devices fixed on lower part positions of a rudder blade, wherein an upper rubber flow guiding piece of a luffing side board rotates to a certain angle around a fixing shaft under the effect of the rudder blade and is close to the rudder blade during luffing a semi-spade rudder, the upper rubber flow guiding piece on the other side is close to the rudder blade under the effect of incoming flow, the surfaces of the flow guiding pieces and the rudder blade are in smooth transition, so that turbulent flow and cavitation phenomena are avoided, and the upper rubber flow guiding pieces of a left board and a right board are automatically close to the rudder blade under the effect of the incoming flow when a rudder angle is recovered to 0 degree; upper spring devices and lower spring devices are arranged between shaft sleeves corresponding to the lower flow guiding devices and lining sleeves corresponding to the lower flow guiding devices, the upper spring devices are used for limiting the clockwise rotation of lower rubber flow guiding pieces, the lower spring devices are used for limiting the anticlockwise rotation of the lower rubber flow guiding pieces, and under the effects of the upper spring devices and the lower spring devices, the lower rubber flow guiding pieces invariably have trends of recovering to initial positions and are close to the spade rudder arm.
Description
Technical field
The present invention relates to a kind of device reducing semi-spade rudder cavitation phenomena, belong to semi-spade rudder design field.
Background technology
Because design and construction technique is all very ripe, semi-spade rudder is widely used in the various ship types such as bulge carrier, oil carrier, box ship, roll-on-roll-off ship.Semi-spade rudder is primarily of rudder horn and rudder blade composition, and there is gap between the two, rudder horn is fixed on hull, and rudder blade then can rotate around rudder stock.When being applied in when semi-spade rudder in the high speed vessel types such as box ship, roll-on-roll-off ship, ro-ro passenger ship, the gap between its rudder blade and rudder horn considerably increases the possibility that rudder blade cavitation phenomena occurs.Cavitation phenomena directly affects the hydrodynamic performance of rudder blade, and can produce serious corrosion to rudder blade structure.
When current flow to rudder blade with certain angle of attack, rudder blade one side forms higher-pressure region, and another side then forms meiobar, and the pressure reduction on rudder blade two sides produces lift and makes ship turning.In meiobar, when the Pressure Drop in somewhere, rudder blade surface is low to moderate saturated vapour pressure corresponding to water temperature at that time, explosive type will occur and vaporize, steam enters gas core by interface and makes it expansion and just forms cavity.If cavity is crumbled and fall on rudder blade surface produce blast, the impulsive force of this implosion converges repeatedly, and surface material can be made to be damaged by degrading.In the time of boats and ships overwhelming majority in operation process, when particularly navigating by water at a relatively high speed, be all in little rudder angle operating mode, the angle changing rate now between rudder blade and hull line of centers is little.But rudder blade is generally all in the rotation wake flow of screw propeller, the both sides of rudder blade can still produce larger difference of pressure.Owing to there is gap between the rudder blade of semi-spade rudder and rudder horn, as shown in Figure 1, 2, gap location is easy to produce turbulent flow, the local pressure in flow field, meiobar is declined further, very easily produces cavitation phenomena.
For above problem, prior art mainly contains following several conventional method:
Reduce the gap between rudder blade and rudder horn as far as possible, reduce turbulent flow;
Adopt distortion rudder, reduce the angle of attack of rudder blade and incoming flow thus make meiobar distribution of pressure evenly rationally;
Rudder horn installs disturbing flow device;
When cavity cannot be avoided, paste stainless steel protection film on rudder blade surface and prevent rudder blade by cavitation corrosion;
Adopt integral rudder or other high-performance rudders.
There is a lot of shortcoming in the several method of current minimizing semi-spade rudder cavitation phenomena:
1) requirement owing to coming about and constructing, needs certain gap between rudder blade and rudder horn, gap is too small when much easily causing coming about, and rudder blade is collided with rudder horn, and brings stern challenge to shipyard Construction precision control;
2) design of distortion rudder needs to calculate through a large amount of, also greatly can improve the difficulty of shipyard construction, extend design and production cycle;
3) disturbing flow device can alleviate the corrosion of cavity for rudder blade, but too increases resistance simultaneously, affects the economy of boats and ships;
4) pasting stainless steel protection film on rudder blade surface can not avoid cavity to produce, the safety method of just a kind of passiveness, but also can increase shipyard cost, reduces the satisfaction of shipowner for boats and ships;
5) integral rudder or other high-performance rudders is adopted greatly can to increase the cost of shipyard.
The present invention is intended to the cavitation phenomena reducing semi-spade rudder, reduces shipyard difficulty of construction simultaneously, reduces laid down cost.
Summary of the invention
The object of the invention is the phenomenon being easy to produce cavitation corrosion for semi-spade rudder, propose a kind of economical and practical solution.
The present invention takes following technical scheme:
Reduce a device for semi-spade rudder cavitation phenomena, comprise guiding device 1 on a pair that is fixed on rudder horn upper position, and be fixed on a pair time guiding device 2 of rudder blade lower position, described upper guiding device 1 comprises anchor shaft 3, Upper shaft sleeve 4, upper lining 5, Lower shaft sleeve 6, lower lining 7 and rubber flow deflector 8, anchor shaft 3, Upper shaft sleeve 4 and Lower shaft sleeve 6 are fixed on rudder horn, upper lining 5, lower lining 7 are fixedly connected with upper rubber flow deflector 8, can rotate around anchor shaft 3 simultaneously, Upper shaft sleeve 4 and upper lining 5 and have axially and radial lubricating contact face between Lower shaft sleeve 6 and lower lining 7, make rubber flow deflector 8 to rotate around anchor shaft 3 neatly, when coming about, the upper rubber flow deflector 8 of side board of coming about is subject to rudder blade application force and turns to certain angle around anchor shaft and be adjacent to rudder blade, the rubber flow deflector 8 of opposite side is adjacent to rudder blade under the effect of incoming flow, flow deflector and rudder blade smooth surface excessive, reduce turbulent flow and cavity, when rudder angle returns to 0, the upper rubber flow deflector 8 of left and right two side of a ship is automatically adjacent to rudder blade under the effect of incoming flow, thus reduction resistance and cavity, described lower guiding device 2 comprises anchor shaft 3, Upper shaft sleeve 4, upper lining 5, Lower shaft sleeve 6, lower lining 7 and lower rubber flow deflector 8 ', wind up device 9 and lower clockwork 10 is configured between the axle sleeve and lining of correspondence, wind up device 9 for limiting rotating clockwise of lower rubber flow deflector 8 ', lower clockwork 10 is for limiting rotating counterclockwise of lower rubber flow deflector 8 ', under the effect of wind up device 9 and lower clockwork 10, lower rubber flow deflector 8 ' has the trend returning to initial position all the time, and be adjacent to rudder horn, thus the gap reduced to greatest extent between rudder blade and rudder horn, improve flow field and reduce cavity.
Further, upper lining 5, lower lining 7 are connected with shrinkage pool by hexagonal boss with upper and lower rubber flow deflector 8,8 '.
Further, rubber flow deflector 8 has elasticity, reduces flow deflector for the friction drag produced of coming about.
Further, be planarea outside described upper rubber flow deflector 8, inner side is curvilinear plane.
Further, described lower rubber flow deflector 8 ' medial and lateral are curvilinear plane.
Further, in upper guiding device 1 position, rudder blade is evagination arcuate structure, and rudder horn is in corresponding indent arcuate structure; In lower guiding device 2 position, rudder horn is evagination arcuate structure, and rudder blade is planar structure.
Further, the quantity of described upper and lower guiding device 1,2 is a pair, lays respectively at the outside of rudder horn and rudder blade.
Beneficial effect of the present invention is:
1) at semi-spade rudder rudder blade and rudder horn gap location, the rotating guiding device of anchor shaft is installed, effectively can improves the turbulent flow of semi-spade rudder rudder blade and rudder horn gap location thus reduce cavitation phenomena.
2) resistance can be reduced to a certain extent and improve steerage.
3) because this device can rotate, too large additional friction can't be brought to coming about thus the burden of increase steering wheel.
4) structure is simple, easy for installation, significantly can reduce the cost that shipyard reduces rudder blade cavitation phenomena.
5) the rotating guiding device of anchor shaft is compared with the method for minimizing rudder blade cavity conventional at present, while effectively reducing cavity, can also meet the requirement reducing shipyard cost and difficulty of construction, have very strong operability.
Accompanying drawing explanation
Fig. 1 is the front view that the rudder horn of semi-spade rudder and rudder blade combine.
Fig. 2 is the drawing in side sectional elevation being positioned at rudder horn and rudder blade upper and lower parts.
Fig. 3 is the front view that the present invention reduces the device of semi-spade rudder cavitation phenomena.
Fig. 4 is the structural representation of upper guiding device.
Fig. 5 be in Fig. 4 A-A to section-drawing.
Fig. 6 is the connection diagram between lining and upper rubber flow deflector.
Fig. 7 is the connection section-drawing between lining and upper rubber flow deflector.
Fig. 8 is the schematic diagram that upper guiding device is arranged on rudder horn.
When Fig. 9 is rudder blade rotation, upper guiding device is arranged on the schematic diagram on rudder horn.
Figure 10 is the structural representation of lower guiding device.
Figure 11 is the connection diagram between lining and lower rubber flow deflector.
Figure 12 is the schematic diagram that lower guiding device is arranged on rudder blade.
When Figure 13 is rudder blade rotation, lower guiding device is arranged on the schematic diagram on rudder blade.
In figure, 1. to go up guiding device, 2. descend guiding device, 3. anchor shaft, 4. Upper shaft sleeve, 5. go up lining, 6. Lower shaft sleeve, 7. descend lining, 8. go up rubber flow deflector, 8 '. lower rubber flow deflector, device of 9. winding up, 10. descends clockwork.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the present invention is further described.
The device reducing semi-spade rudder cavitation phenomena is divided into two kinds of forms, and a kind of is the rotating upper guiding device 1 of anchor shaft at rudder horn place, and another kind is that the anchor shaft at rudder pintle place rotatably descends guiding device 2, as shown in Figure 3.Upper guiding device 1 is arranged on rudder horn, can select the guiding device 1 of suitable quantity according to the size of rudder blade; Lower guiding device 2 is arranged on rudder blade.
As shown in Figure 4, upper guiding device 1 forms primarily of anchor shaft 3, Upper shaft sleeve 4, upper lining 5, Lower shaft sleeve 6, lower lining 7 and rubber flow deflector 8.Anchor shaft 3, Upper shaft sleeve 4 and Lower shaft sleeve 6 are fixed on rudder horn; Upper lining 5, lower lining 7 are connected with shrinkage pool by hexagonal boss with rubber flow deflector 8, can rotate around anchor shaft 3, as shown in Figure 4 simultaneously.Upper shaft sleeve 4 and upper lining 5 and have axially and radial two lubricating contact faces between Lower shaft sleeve 6 and lower lining 7, make rubber flow deflector 8 to rotate around anchor shaft 3 neatly.
As shown in Figure 8,9, to beat right standard rudder, when coming about, the rubber flow deflector of starboard is subject to rudder blade application force and turns to certain angle around anchor shaft and be adjacent to rudder blade, the rubber flow deflector of larboard is then adjacent to rudder blade under the effect of incoming flow, flow deflector make rudder blade and rudder horn gap location rudder blade surface energy excessively smooth, reduce turbulent flow and cavity.When rudder angle returns to 0, the flow deflector of left and right two side of a ship automatically can be adjacent to rudder blade under the effect of incoming flow, thus reduction resistance and cavity.Rubber flow deflector can rotate around anchor shaft neatly, and rubber has certain elasticity, greatly can reduce flow deflector for the friction drag produced of coming about.
As shown in Figure 10, similar to upper guiding device, lower guiding device 2 also comprises anchor shaft 3, Upper shaft sleeve 4, upper lining 5, Lower shaft sleeve 6, lower lining 7 and rubber flow deflector 8 ', because guiding device 2 is arranged on rudder blade, its stressing conditions more complicated, so also to need between axle sleeve and lining wind up device 9 and lower clockwork 10. of configuration to wind up device 9 for limiting rotating clockwise of rubber flow deflector 8, lower clockwork 10 is then for limiting rotating counterclockwise of rubber flow deflector 8.No matter rudder angle is much, and how complicated incoming flow is, under the effect of wind up device 9 and lower clockwork 10, rubber flow deflector 8 ' has the trend returning to initial position all the time, thus the gap reduced to greatest extent between rudder blade and rudder horn, improve flow field and reduce cavity, as illustrated by figs. 12-13.
The present invention installs the rotating guiding device of anchor shaft at semi-spade rudder rudder blade and rudder horn gap location, effectively can improve the turbulent flow of semi-spade rudder rudder blade and rudder horn gap location thus reduce cavitation phenomena, can also reduce resistance to a certain extent and improve steerage.Because this device can rotate, too large additional friction can't be brought to coming about thus the burden of increase steering wheel.Structure of the present invention is simple, easy for installation, significantly can reduce the cost that shipyard reduces rudder blade cavitation phenomena.
The rotating guiding device of anchor shaft, compared with the method for minimizing rudder blade cavity conventional at present, while effectively reducing cavity, can also meet the requirement reducing shipyard cost and difficulty of construction, have very strong operability.
Claims (7)
1. reduce a device for semi-spade rudder cavitation phenomena, it is characterized in that:
Comprise at least two the upper guiding devices (1) being fixed on rudder horn upper position, and at least two that are fixed on rudder blade lower position lower guiding devices (2);
Described upper guiding device (1) comprises anchor shaft (3), Upper shaft sleeve (4), upper lining (5), Lower shaft sleeve (6), lower lining (7) and rubber flow deflector (8); Anchor shaft (3), Upper shaft sleeve (4) and Lower shaft sleeve (6) are fixed on rudder horn; Upper lining (5), lower lining (7) are fixedly connected with upper rubber flow deflector (8), can rotate around anchor shaft (3) simultaneously, Upper shaft sleeve (4) and upper lining (5) and have axially and radial lubricating contact face between Lower shaft sleeve (6) and lower lining (7), make rubber flow deflector (8) to rotate around anchor shaft (3) neatly; When coming about, the upper rubber flow deflector (8) of side board come about is subject to rudder blade application force and turns to certain angle around anchor shaft and be adjacent to rudder blade, the rubber flow deflector (8) of opposite side is then adjacent to rudder blade under the effect of incoming flow, flow deflector and rudder blade smooth surface excessive, reduce turbulent flow and cavity, when rudder angle returns to 0, the upper rubber flow deflector (8) of left and right two side of a ship under the effect of incoming flow automatically and rudder blade be adjacent to;
Described lower guiding device (2) comprises anchor shaft (3), Upper shaft sleeve (4), upper lining (5), Lower shaft sleeve (6), lower lining (7) and lower rubber flow deflector (8 '), wind up device (9) and lower clockwork (10) is configured between the axle sleeve and lining of correspondence, wind up device (9) for limiting rotating clockwise of lower rubber flow deflector (8 '), lower clockwork (10) is then for limiting rotating counterclockwise of lower rubber flow deflector (8 '), under the effect of device of winding up (9) and lower clockwork (10), lower rubber flow deflector (8 ') has the trend returning to initial position all the time, and be adjacent to rudder horn.
2. the device reducing semi-spade rudder cavitation phenomena as claimed in claim 1, is characterized in that: upper lining (5), lower lining (7) are connected with shrinkage pool by hexagonal boss with upper and lower rubber flow deflector (8,8 ').
3. the device reducing semi-spade rudder cavitation phenomena as claimed in claim 1, is characterized in that: rubber flow deflector (8) has elasticity, reduces flow deflector for the friction drag produced of coming about.
4. the device reducing semi-spade rudder cavitation phenomena as claimed in claim 1, is characterized in that: described upper rubber flow deflector (8) outside is planarea, and inner side is curvilinear plane.
5. the device reducing semi-spade rudder cavitation phenomena as claimed in claim 1, is characterized in that: described lower rubber flow deflector (8 ') medial and lateral are curvilinear plane.
6. the device reducing semi-spade rudder cavitation phenomena as claimed in claim 1, it is characterized in that: in upper guiding device (1) position, rudder blade is evagination arcuate structure, and rudder horn is in corresponding indent arcuate structure; In lower guiding device (2) position, rudder horn is evagination arcuate structure, and rudder blade is planar structure.
7. the device reducing semi-spade rudder cavitation phenomena as claimed in claim 1, is characterized in that: the quantity of described upper and lower guiding device (1,2) is a pair, lays respectively at the outside of rudder horn and rudder blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510289580.5A CN104859832A (en) | 2015-05-29 | 2015-05-29 | Semi-spade rudder cavitation probability reducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510289580.5A CN104859832A (en) | 2015-05-29 | 2015-05-29 | Semi-spade rudder cavitation probability reducing device |
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| Publication Number | Publication Date |
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| CN104859832A true CN104859832A (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510289580.5A Pending CN104859832A (en) | 2015-05-29 | 2015-05-29 | Semi-spade rudder cavitation probability reducing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113501122A (en) * | 2021-07-29 | 2021-10-15 | 中国舰船研究设计中心 | Hidden rudder angle limiting device for semi-suspension rudder |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004345458A (en) * | 2003-05-21 | 2004-12-09 | Mitsubishi Heavy Ind Ltd | Rudder device and vessel |
| KR100605125B1 (en) * | 2005-05-13 | 2006-07-28 | 재단법인서울대학교산학협력재단 | Marine rudder with crevice flow breaker between horn and rudder blade |
| KR100735724B1 (en) * | 2006-06-15 | 2007-07-06 | 김효철 | Other vessels for ships with double-block clearance gap breakers installed between the fixed and movable parts |
| CN101186233A (en) * | 2007-12-19 | 2008-05-28 | 沪东中华造船(集团)有限公司 | Method for reducing vessels stern semi-balance suspension rudder blade surface cavitation |
| DE202009009996U1 (en) * | 2009-07-21 | 2010-12-02 | Becker Marine Systems Gmbh & Co. Kg | Finsruder for watercraft |
| KR20100128512A (en) * | 2009-05-28 | 2010-12-08 | 인하대학교 산학협력단 | Other apparatus for vessel and installation method with gap flow blocking rod between horn and rudder plate |
| CN204688398U (en) * | 2015-05-29 | 2015-10-07 | 上海船舶研究设计院 | A kind of device reducing semi-spade rudder cavitation phenomena |
-
2015
- 2015-05-29 CN CN201510289580.5A patent/CN104859832A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004345458A (en) * | 2003-05-21 | 2004-12-09 | Mitsubishi Heavy Ind Ltd | Rudder device and vessel |
| KR100605125B1 (en) * | 2005-05-13 | 2006-07-28 | 재단법인서울대학교산학협력재단 | Marine rudder with crevice flow breaker between horn and rudder blade |
| KR100735724B1 (en) * | 2006-06-15 | 2007-07-06 | 김효철 | Other vessels for ships with double-block clearance gap breakers installed between the fixed and movable parts |
| CN101186233A (en) * | 2007-12-19 | 2008-05-28 | 沪东中华造船(集团)有限公司 | Method for reducing vessels stern semi-balance suspension rudder blade surface cavitation |
| KR20100128512A (en) * | 2009-05-28 | 2010-12-08 | 인하대학교 산학협력단 | Other apparatus for vessel and installation method with gap flow blocking rod between horn and rudder plate |
| DE202009009996U1 (en) * | 2009-07-21 | 2010-12-02 | Becker Marine Systems Gmbh & Co. Kg | Finsruder for watercraft |
| CN204688398U (en) * | 2015-05-29 | 2015-10-07 | 上海船舶研究设计院 | A kind of device reducing semi-spade rudder cavitation phenomena |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113501122A (en) * | 2021-07-29 | 2021-10-15 | 中国舰船研究设计中心 | Hidden rudder angle limiting device for semi-suspension rudder |
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Application publication date: 20150826 |
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