CN115503916A - Oar rudder cooperation structure for preventing rudder degradation - Google Patents
Oar rudder cooperation structure for preventing rudder degradation Download PDFInfo
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- CN115503916A CN115503916A CN202211383366.2A CN202211383366A CN115503916A CN 115503916 A CN115503916 A CN 115503916A CN 202211383366 A CN202211383366 A CN 202211383366A CN 115503916 A CN115503916 A CN 115503916A
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- Prior art keywords
- rudder
- propeller
- cap
- paddle
- preventing
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention relates to a paddle rudder matching structure for preventing rudder degradation, which comprises a ship body, wherein a propeller is arranged backwards below the tail part of the ship body, a rudder is arranged on the ship body behind the propeller, the rear end face of a hub in the center of the propeller is connected with a paddle cap extending backwards, the paddle cap passes through the lower part of the rudder backwards, and an interval is arranged between the outer surface of the paddle cap and the bottom surface of the rudder; the propeller cap on the rear end face of the center of the propeller extends backwards and penetrates through the rudder, so that hub vortexes generated at the root of the propeller can be guided backwards along the outer wall surface of the propeller cap and directly burst in wake flow behind the rudder in the working and rotating process of the propeller, the hub vortexes are effectively prevented from being in contact with the rudder, the rudder is prevented from being corroded and vibrated due to impact of the hub vortexes, and the service life and the service reliability of the rudder are greatly guaranteed.
Description
Technical Field
The invention relates to the technical field of ships, in particular to a paddle rudder matching structure for preventing rudder degradation.
Background
The combination of propellers and rudders is a standard configuration for a vessel steering and propulsion system. In the running process, a large amount of water flow is thrown backwards by the propeller rotating at a high speed, and along with the movement of the propeller along with the ship, the circumferential liquid is not ready to be supplemented due to the change of space, and a partial vacuum area is formed between the rear part of the propeller and the rudder; the liquid around the vacuum region boils due to the low pressure, forming cavitation bubbles.
In the prior art, particularly for a small high-speed ship, due to the fact that the tail portion arrangement space of the small high-speed ship is limited, the propeller and the rudder are close to each other, cavitation bubbles of the propeller are serious during high-speed navigation, strong hub vortexes are formed by the cavitation bubbles, the hub vortexes act on the rear rudder to cause impact and corrosion, cavitation bubble degradation and vibration phenomena are prone to occur on the rudder, and the service lives of the rudder and the propeller are seriously influenced.
Disclosure of Invention
The applicant aims at the defects in the prior art and provides a paddle rudder matching structure for preventing rudder erosion with a reasonable structure, so that the contact between a hub vortex and a rudder is effectively avoided, the rudder is prevented from erosion and vibration caused by the impact of the hub vortex, and the service life and the use reliability are greatly ensured.
The technical scheme adopted by the invention is as follows:
the utility model provides a prevent oar rudder cooperation structure that rudder denudates, includes the hull, and the screw is installed towards the back to hull afterbody below, is located the hull at screw rear and installs the rudder, and the propeller cap that extends backward has been linked up to the propeller hub rear end face at screw center, and the propeller cap passes behind the rudder direction, is provided with the interval between propeller cap surface and the rudder bottom surface.
As a further improvement of the above technical solution:
the propeller cap is a rotating body structure which is coaxial with the propeller, and the rotating body structure is provided with a smooth outer surface from front to back; the outer wall surface of the rotator structure is provided with a guide groove for guiding the hub vortex to flow backwards.
The cross-sectional area of the paddle cap gradually decreases along the axial direction backwards.
The rear end of the paddle cap protrudes backwards from the rear edge of the bottom surface of the rudder, and the protruding size is 2-5 mm.
The paddle cap extends backwards and forms a small end face at the rear end, and the diameter of the small end face is 2mm-4mm.
The paddle cap is of a backward conical structure, the bottom surface of the rudder is provided with an inclined surface which is consistent with the inclined direction of the conical structure, a gap is arranged between the inclined surface and the conical structure, and the gap is set to be 3-8 mm.
The paddle cap is provided with a spiral groove along the circumferential wall surface of the conical structure.
The rotating direction of the spiral groove is consistent with the rotating direction of the propeller.
The section of the spiral groove is of a rectangular structure, the width of the spiral groove is 2.5mm-4mm, and the depth of the spiral groove is 1.5mm-3mm.
The propeller is installed by a driving mechanism installed inside the ship body in a rear suspension mode through the propeller shaft, and the propeller shaft is in a backward horizontal or backward downward inclined trend.
The invention has the following beneficial effects:
the propeller cap of the central rear end surface of the propeller extends backwards and penetrates through the rudder, so that hub vortexes generated at the root of the propeller can be guided backwards along the outer wall surface of the propeller cap in the working and rotating process of the propeller and directly collapse in wake flow behind the rudder, and the contact between the hub vortexes and the rudder is effectively avoided, so that the rudder is free from erosion and vibration caused by hub vortex impact, the service life and the service reliability of the rudder are greatly ensured, and the propeller cap is particularly suitable for being used for small high-speed ships.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Fig. 3 is a schematic diagram of the structure of the spiral groove on the paddle cap of the invention.
Wherein: 1. a hull; 2. a paddle shaft; 3. a hub; 4. a propeller; 5. a helical groove; 6. a paddle cap; 7. and a rudder.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings.
As shown in fig. 1, the rudder-propeller coordination structure for preventing the rudder from being degraded in the present embodiment includes a hull 1, a propeller 4 is installed backward below the tail of the hull 1, a rudder 7 is installed on the hull 1 behind the propeller 4, a propeller cap 6 extending backward is connected to the rear end face of a hub 3 at the center of the propeller 4, the propeller cap 6 passes backward under the rudder 7, and a space is provided between the outer surface of the propeller cap 6 and the bottom surface of the rudder 7.
In the embodiment, the propeller cap 6 on the rear end surface of the center of the propeller 4 extends backwards and penetrates through the rudder 7, so that hub vortexes generated at the root of the propeller 4 can be guided backwards along the outer wall surface of the propeller cap 6 in the working and rotating process of the propeller 4, and are directly collapsed in wake flow behind the rudder 7, and the contact between the hub vortexes and the rudder 7 is effectively avoided.
Further, the propeller cap 6 is a rotating body structure which is coaxial with the propeller 4, and the rotating body structure is provided with a smooth outer surface from front to back; the outer wall surface of the rotator structure is provided with a guide groove for guiding the hub vortex to flow backwards.
In this embodiment, the paddle cap 6 is configured as a rotator structure, and the paddle cap 6 rotates together with the propeller 4 during rotation, so that the rotation of the paddle cap 6 is smooth due to the rotator structure, and the rotator structure is provided with a smooth outer surface, which is convenient for combining with a guide groove on an outer wall surface, so that the hub vortex can be smoothly guided to the rear.
Further, the cross-sectional area of the blade cap 6 decreases gradually axially rearwards, so that the rearwardly directed hub vortex gradually contracts towards the middle, assisting in achieving and ensuring the dissipation and collapse of the hub vortex.
In one embodiment shown in fig. 2, the rear end of the paddle cap 6 protrudes rearward from the rear edge of the bottom surface of the rudder 7 by a protruding dimension b of 2mm to 5mm.
In this embodiment, the paddle caps 6 protrude from the rudder 7 rearward, so that the hub vortex guided rearward along the paddle caps 6 can be smoothly guided to the rear of the rudder 7, thereby completely and reliably avoiding the contact between the hub vortex and the rudder 7, and effectively ensuring the non-contact between the hub vortex and the rudder 7.
Further, the paddle cap 6 extends backwards and forms a small end face at the rear end, and the diameter size c of the small end face is 2mm-4mm.
In this embodiment, the tail end of the paddle cap 6 is reduced in size as much as possible to assist in smooth rearward collapse of the hub vortex.
Furthermore, the paddle cap 6 is of a backward conical structure, the bottom surface of the rudder 7 is provided with an inclined surface which is consistent with the inclination direction of the conical structure, a gap is arranged between the inclined surface and the conical structure, and the gap a is set to be 3-8 mm.
In this embodiment, the propeller cap 6 is provided with a simple conical structure, which is convenient for processing and manufacturing, and can meet the requirement of reliably guiding the backward flow of the hub vortex.
In this embodiment, the bottom surface of the rudder 7 is set to be an inclined surface that is inclined uniformly with the conical structure, and an interval is set, so that the actual use of the rudder 7 is not affected while the drainage reliability is ensured.
Furthermore, a spiral groove 5 is formed on the paddle cap 6 along the circumferential wall surface of the conical structure.
In the embodiment, the backward flow guiding of the hub vortex is further facilitated by the arrangement of the spiral groove 5.
Further, the spiral direction of the spiral groove 5 is consistent with the rotating direction of the propeller 4, so that the smoothness, reliability and effectiveness of the hub vortex flow guiding are effectively guaranteed.
In the embodiment shown in fig. 3, the section of the spiral groove 5 is configured as a rectangular structure, the width d thereof is set to 2.5mm-4mm, and the depth e thereof is set to 1.5mm-3mm.
Further, the propeller 4 is mounted by a driving mechanism mounted inside the hull 1 in a rearward suspended manner through the propeller shaft 2, and the propeller shaft 2 tends to be horizontal rearward or inclined downward rearward.
In practical use, particularly for small high-speed ships, the paddle shaft 2 of the ship usually has the tendency of inclining backwards and downwards relative to the hull 1 during driving; for larger and large ships, the paddle shaft 2 can also be in a backward horizontal posture relative to the ship body 1; the hub vortex is effectively induced by the provision of the paddle cap 6 extending rearwardly through the rudder 7.
By arranging the cap 6, the hub 3 coaxially with respect to the shaft 2, such that the cap 6 is located at the centre of the root of the propeller 4, efficient guidance of the hub vortex is facilitated.
In practical use, the hub 3 will also be provided with a conical structure with a backward outer wall surface, and the conical angle of the conical structure can be set to be the same or different relative to the conical angle of the outer wall surface of the blade cap 6, without affecting the backward guiding of the backward extending blade cap 6 to the hub vortex.
The rudder 7 has the advantages that the structure is ingenious, the contact between the hub vortex and the rudder 7 is effectively avoided through the arrangement of the structural matching, so that the rudder 7 is free from the corrosion and vibration caused by the impact of the hub vortex, the service life and the use reliability of the rudder 7 are greatly ensured, and the rudder is particularly suitable for being used on small high-speed ships.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (10)
1. The utility model provides a prevent oar rudder cooperation structure that rudder degrades, includes hull (1), and propeller (4), its characterized in that are installed towards the back to hull (1) afterbody below: a rudder (7) is installed on a ship body (1) behind the propeller (4), a propeller cap (6) extending backwards is connected to the rear end face of a propeller hub (3) in the center of the propeller (4), the propeller cap (6) penetrates through the lower portion of the rudder (7) backwards, and a gap is formed between the outer surface of the propeller cap (6) and the bottom surface of the rudder (7).
2. A rudder propeller-rudder fitting structure for preventing rudder degradation according to claim 1, wherein: the propeller cap (6) is a rotating body structure which is coaxial with the propeller (4), and the rotating body structure is provided with a smooth outer surface from front to back; the outer wall surface of the rotator structure is provided with a guide groove for guiding the hub vortex to flow backwards.
3. A rudder propeller-rudder fitting structure for preventing rudder degradation according to claim 1, wherein: the cross-sectional area of the paddle cap (6) is gradually reduced along the axial direction backwards.
4. A rudder propeller-rudder fitting structure for preventing rudder degradation according to claim 1, wherein: the rear end of the paddle cap (6) protrudes backwards from the rear edge of the bottom surface of the rudder (7), and the protruding size is 2-5 mm.
5. The paddle rudder fitting structure for preventing rudder degradation according to claim 1, wherein: the paddle cap (6) extends backwards and forms a small end face at the rear end, and the diameter of the small end face is 2mm-4mm.
6. The paddle rudder fitting structure for preventing rudder degradation according to claim 1, wherein: the paddle cap (6) is of a backward conical structure, the bottom surface of the rudder (7) is provided with an inclined surface which is consistent with the inclined direction of the conical structure, and a gap is arranged between the inclined surface and the conical structure and is set to be 3-8 mm.
7. The paddle rudder fitting structure for preventing rudder degradation according to claim 1, wherein: the paddle cap (6) is provided with a spiral groove (5) along the circumferential wall surface of the conical structure.
8. The paddle rudder fitting structure for preventing rudder degradation according to claim 7, wherein: the rotating direction of the spiral groove (5) is consistent with the rotating direction of the propeller (4).
9. A rudder fitting structure for preventing rudder degradation according to claim 7, wherein: the section of the spiral groove (5) is of a rectangular structure, the width of the spiral groove is set to be 2.5mm-4mm, and the depth of the spiral groove is set to be 1.5mm-3mm.
10. A rudder propeller-rudder fitting structure for preventing rudder degradation according to claim 1, wherein: the propeller (4) is installed by a driving mechanism installed inside the ship body (1) in a rearward suspension mode through the propeller shaft (2), and the propeller shaft (2) is in a backward horizontal or backward downward inclined trend.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211383366.2A CN115503916A (en) | 2022-11-07 | 2022-11-07 | Oar rudder cooperation structure for preventing rudder degradation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211383366.2A CN115503916A (en) | 2022-11-07 | 2022-11-07 | Oar rudder cooperation structure for preventing rudder degradation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115503916A true CN115503916A (en) | 2022-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211383366.2A Pending CN115503916A (en) | 2022-11-07 | 2022-11-07 | Oar rudder cooperation structure for preventing rudder degradation |
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|---|---|
| CN (1) | CN115503916A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3947151A (en) * | 1973-12-19 | 1976-03-30 | Karl Gustav Herman Stillerud | Hollow hub marine propeller with anticavitation groove |
| CN2835632Y (en) * | 2005-11-18 | 2006-11-08 | 上海贡新机电工程技术有限公司 | Screw propeller cap with helical fin |
| CN102923285A (en) * | 2012-10-12 | 2013-02-13 | 中国船舶重工集团公司第七○二研究所 | Vortex removal fin of propeller hub |
| CN212022939U (en) * | 2020-04-16 | 2020-11-27 | 上海爱船船舶科技有限公司 | Integrated energy-saving fin and propulsion device |
-
2022
- 2022-11-07 CN CN202211383366.2A patent/CN115503916A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3947151A (en) * | 1973-12-19 | 1976-03-30 | Karl Gustav Herman Stillerud | Hollow hub marine propeller with anticavitation groove |
| CN2835632Y (en) * | 2005-11-18 | 2006-11-08 | 上海贡新机电工程技术有限公司 | Screw propeller cap with helical fin |
| CN102923285A (en) * | 2012-10-12 | 2013-02-13 | 中国船舶重工集团公司第七○二研究所 | Vortex removal fin of propeller hub |
| CN212022939U (en) * | 2020-04-16 | 2020-11-27 | 上海爱船船舶科技有限公司 | Integrated energy-saving fin and propulsion device |
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