CA2025507A1 - Nozzle propeller device - Google Patents
Nozzle propeller deviceInfo
- Publication number
- CA2025507A1 CA2025507A1 CA 2025507 CA2025507A CA2025507A1 CA 2025507 A1 CA2025507 A1 CA 2025507A1 CA 2025507 CA2025507 CA 2025507 CA 2025507 A CA2025507 A CA 2025507A CA 2025507 A1 CA2025507 A1 CA 2025507A1
- Authority
- CA
- Canada
- Prior art keywords
- propeller
- nozzle
- front piece
- acting
- ice crusher
- 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.)
- Abandoned
Links
- 230000001174 ascending effect Effects 0.000 claims description 2
- 230000000875 corresponding effect Effects 0.000 claims 3
- 230000000903 blocking effect Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 230000036461 convulsion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
- B63H5/165—Propeller guards, line cutters or other means for protecting propellers or rudders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2211/00—Applications
- B63B2211/06—Operation in ice-infested waters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Crushing And Pulverization Processes (AREA)
- Nozzles (AREA)
Abstract
Abstract The invention relates to a nozzle propeller device, which comprises a propeller nozzle (12), inside which is arranged a propeller (14) driven by a propeller shaft 22. In front of the propeller (14) arranged to rotate inside the propeller nozzle (12) is arranged a front piece (16) acting as an ice crusher and provided with blades (17) or corresponding extensions, which front piece is arranged to rotateon the same rotational shaft (S-S) as the propeller (14). Said front piece (16) is preferably provided with a drive, but it can also be freely rotative.
Description
Q~
Nozzle propeller device 5 The present invention relates to a nozzle propeller device, which propeller device comprises a propeller nozzle, inside which is arranged a propeller drivenby a propeller shaft.
As is previously known, the propelling force of a propeller can especially at low 10 speeds be improved by means of a propeller nozzle to be placed around a circular propeller nozzle. For achieving the necessary propelling force, the diameter of the propeller then used can be possibly even slightly decreased. In ice conditions, however, a fairly considerable problem occurs in connection witha nozzle propeller device, i.e., the propeller device can be blocked when ice 15 blocks wedge between the frame of the propeller device and the nozzle, or on the other hand, when travelling in brash and the front part is filled with brash.
In both cases, the water supply of the propeller is prevented either partially or totally, which results in an essential decrease in the propelling force of the propeller. This problem is especially apparent in connection with small propel-20 ling devices. In many cases, a propeller nozzle is therefore not used. Forexample in harbour icebreakers, it has not been possible to use a propeller nozzle, since in narrow docks ice often packs and accumulates in such a way thatdocks contain packed ice down to the bottom.
25 Attempts have previously been made to prevent the blocking of a nozzle in several ways, but with fairly poor results. In propeller nozzles used without additional devices, attempts have been made to prevent the blocks in such way that the rotational direction of the propeller has been reversed. However, this solution is fairly poor especially in cases, in which there is plenty of packed ice.
30 A vessel can then advance only by jerks and by very short distances at a time.
In addition, an attempt has been made to prevent a blockage by arranging various additional devices in connection with the propeller nozzle device. Such solutions have been previously described e.g. in Finnish patent applications no.
Nozzle propeller device 5 The present invention relates to a nozzle propeller device, which propeller device comprises a propeller nozzle, inside which is arranged a propeller drivenby a propeller shaft.
As is previously known, the propelling force of a propeller can especially at low 10 speeds be improved by means of a propeller nozzle to be placed around a circular propeller nozzle. For achieving the necessary propelling force, the diameter of the propeller then used can be possibly even slightly decreased. In ice conditions, however, a fairly considerable problem occurs in connection witha nozzle propeller device, i.e., the propeller device can be blocked when ice 15 blocks wedge between the frame of the propeller device and the nozzle, or on the other hand, when travelling in brash and the front part is filled with brash.
In both cases, the water supply of the propeller is prevented either partially or totally, which results in an essential decrease in the propelling force of the propeller. This problem is especially apparent in connection with small propel-20 ling devices. In many cases, a propeller nozzle is therefore not used. Forexample in harbour icebreakers, it has not been possible to use a propeller nozzle, since in narrow docks ice often packs and accumulates in such a way thatdocks contain packed ice down to the bottom.
25 Attempts have previously been made to prevent the blocking of a nozzle in several ways, but with fairly poor results. In propeller nozzles used without additional devices, attempts have been made to prevent the blocks in such way that the rotational direction of the propeller has been reversed. However, this solution is fairly poor especially in cases, in which there is plenty of packed ice.
30 A vessel can then advance only by jerks and by very short distances at a time.
In addition, an attempt has been made to prevent a blockage by arranging various additional devices in connection with the propeller nozzle device. Such solutions have been previously described e.g. in Finnish patent applications no.
2 ~ 7 861370 and 861371. In these publications, attèmpts have been made to prevent the blocks in such a way that prongs or the like have been fastened to the nozzle, the purpose of which is to crush the ice blocks, or in such a way that aseparate circular part has been arranged in front of the propeller nozzle, the S purpose of which is to prevent the ice blocks from blocking the propeller nozle.
However, these solutions have not eliminated the problem, but ice blocks have still blocked the propeller nozle, since they have fastened to said prongs or circular part.
10 Attempts have previously been made to prevent the blocking of the nozzle alsoin such a way that an "ice cage" has been arranged in front of the nozzle to prevent ice blocks from entering the nozzle. However, essential drawbacks of this solution are a high resistance caused by the ice cage and its poor durability.
In addition, at high speeds the "ice cage" itself blocks in spite of whether said 15 cage is streamlined or not. The cage can fill with crushed ice, since suitably small pieces of ice can succeed in entering the gaps of the cage, but do not come into a correct position to be able to come out of a gap of the same size.
Such cages can be mounted stationary on the hull of a vessel, or e.g. in connec-tion with a turning propeller device, they can be mounted stationary on the 20 propeller device itself to turn with it. It has yet not been possible to solve the blocking prob1em by means of them, as mentioned above.
The object of the present invention is to create such a nozzle propeller device,which avoids the drawbacks related to prior art and which prevents the wedging 25 of ice b10cks between the propeller device frame and the nozzle. For achieving this, the invention is mainly characterized in that in front of a prope11er arranged to rotate inside a propeller nozzle is arranged a front piece acting as an ice crusher and provided with blades or corresponding extensions, which front piece is arranged to rotate on the same rotational shaft as the propeller.
As the most important advantage of the invention in comparison with solutions of prior art can be regarded that the solutions of prior art have been "passiw"
and tried only to prevent ice blocks from blocking the propeller device, whe-reas the device in accordance with the invention is arranged to operate "actively"
2~ ~53~7 in such a way that the inventive nozzle propeller device is provided with an arrangement, which tries to crush large ice blocks stuck in the nozzle so that they can pass through the nozzle, in which case the nozzle itself does not block.
At the same time, the crusher acts a feeder screw that packs the ice blocks to the nozzle. The other advantages and characteristics of the invention are presented in the following more detailed description of the invention.
The invention is next described in more detail with reference to the figures of the accompanying drawing.
Fig. 1 is a schematic side view of an inventive nozzle propeller device in the form of a turnable propeller device.
Fig. 2 corresponds to Fig. 1 seen from view D.
Fig. 3 is a schematic sectional view of a propeller device of Fig. 1 and 2 and shows an alternative embodiment of a driving system of the propeller device.
Fig. 4 shows schematically the inventive nozzle propeller device in connection with a conventional unturnable propeller drive.
In Fig. 1-3 of the drawing, the inventive nozle propeller device is marked generally by a reference number 10. The type of the nozle propeller device 10 of Fig. 1-3 is e.g. such a turnable propeller device, which is described previously in the Finnish patent applications no. 830373 and 853173. The propeller device thus comprises a frame 11, to which a propeller nozzle 12 is fastened by means of a support construction 13. A propeller 14 is fastened rotatively inside the propeller nozzle 12. Power is supplied to the propeller device 10 by a vertical shaft 18, which drives by means of an bevel gearing 20 a propeller shaft 22, to which a hub 15 is fastened and which is rotatively mounted on an bevel-gearing frame 21.
In conventional propeller devices, the front part of the bevel-gearing frame is formed as a streamlined front dome, but in the solution in accordance with the 2 ~ 7 invention the front dome is replaced by a rotating front piece 16, to whose surface blades 17 are fastened. The front piece 16 is arranged tO rotate with the propeller 14 around a cornmon rotational shaft S-S. The front piece 16 can be mounted freely rotatively on the propeller device frame 11, but in the most 5 preferable embodiment of the invention the front piece is arranged to be driven.
The purpose of the front piece and the blades 17 fastened thereto is to produce movement in the ice blockage in front of the propeller nozzle 12 and crush the ice blocks in front of the propeller nozzle 12 in such a way that they can pass through the propeller nozzle 12 or are guided outside the propeller nozzle. The 10 blades 17 can be e.g. straight or prong-like, in which case they act only as an ice crusher, but on the other hand, they can be arranged, as shown in the figure, inan ascending form, whereby they in a way act as a second propeller and as a device guiding the crushed ice. In the figures of the drawing, the blades 17 areshown to have a fairly small size, but their size can also be considerably larger 15 than that shown in the figures, which improves their propelling and crushing effect.
The propeller nozzle 12 is in a conventional manner formed in such a way that it narrows from its leading edge 12a, until it after the narrowest point of the 20 propeller nozzle 12, which is marked in the figures of the drawing with a reference A, continues mainly cylindrical to the trailing edge 12b of the propel-ler nozzle. In order that the front piece 16 with its blades 17 would act in theintended manner, it is placed with respect to the propeller nozzle 12 in such a way that it is located at the narrowest point A of the propeller nozzle 12, at the 25 start of the cylindrical portion or on its front side. This ensures that the ice blocks are crushed so small that they can pass through the narrowest point A of the propeller nozzle 12.
It was mentioned above that the front piece 16 acting as an ice crusher can be 30 arranged freely rotatively in the propeller device 10, but in its most preferred form it is driven. Fig. 3 shows an alternative embodiment of a drive of the front piece 16 acting as an ice crusher. As mentioned above, in the embodiment of Fig. 3 power is supplied to the propeller shaft 22 on a vertical shaft 18 via a bevel gearing 20. The bevel gearing 20 is comprised of a first bevel gear 19 on 2 ~ 7 the vertical shaft 18 and of a second bevel gear 23 on the propeller shaft 22. In the embodiment of Fig. 3, the propeller shaft is extended past the front bearingpoint to the front side of the bevel-gearing frame 21, and the front piece 16 acting as an ice crusher is fastened in a suitable manner to said propel1er shaft 5 22. In the solution of Fig. 3, the front piece 16 acting as an ice crusher thus rotates in the same direction as the propeller 14 and at the same rotational speed.
The solution of Fig.3 may be regarded as the best embodiment of the invention, 10 since its construction is the simplest and thereby the most reliable in operation.
However, the drive of the front piece 16 acting as an ice crusher can be ar-ranged mechanically for example so that the front piece 16 is arranged to rotatein an opposite direction relative to the propeller 14. The drive of the front piece can then be realized in a known manner, as according to a Finnish patent application no. 861798. The construction of the propeller device will then yet be more complicated than the construction of Fig. 3. However, the rotation of the front piece 16 can be arranged also e.g. electrically, hydraulically or in some other non-mechanical manner. Such modes of operation nevertheless further increase the complexity of the construction of the propeller device 10 and are 20 thus more expensive than a mechanical mode of operation.
Fig. 1-3 show the use of the front piece 16 acting as an ice crusher in connection vrith a turnable propeller device 10 provided with a bevel gearing 20. However, the invention can also be applied to conventional nozzle propeller devices, and 25 an attempt is made to illustrate this schematically in Fig. 4. In Fig. 4, the hull of the vessel is marked with a reference number 5. Power is supplied to a propeller34 via a propeller shaft 42, which is in a conventional manner mounted on the vessel hull 5. Around a propeller 34 is arranged a propeller nozzle 32, which isin a suitable manner fastened to the vessel hull 5. Fixing elements are not shown 30 in Fig. 4. In the embodiment of Fig. 4, the propeller shaft 42 is extended from the vessel hull 5 by such a distance that it has been possible to place between the propeller and the hull S a front piece 36 provided with blades 37, which is in a suitable manner fastened to the propeller shaft 42, to which also a propeller hub 35 is fixed. In the embodiment of Fig. 4, the front piece 36 acting as an ice 2~S~7 crusher thus rotates together with the propeller 34. As regards the location of the front piece 36, the same principle as that described above is followed, i.e.the front piece is placed at the narrowest point A of the propeller nozzle 32 oron its front side.
s In Fig. 4, the nozzle propeller device is generally marked with a reference number 30 and the leading edge of the propeller nozzle 32 with a reference number 32 and the trailing edge with a reference number 32b. Although the inventive nozzle propeller device 30 can also be realized as a conventional 10 solution according to Fig. 4, problems may however occur in this connection e.g.
with respect to the bearing arrangement of the propeller shaft 42, since the propeller shaft 42 is extended longer th~n in conventional solutions. As a result, the solution according to the invention can be regarded as the most preferable in the embodiment of Fig. 1-3. In Fig. 1-3, the use of the invention is more 15 preferable also because the front piece 16 and the blades 17 therein can be formed more freely than in the solution of Fig. 4.
The invention has above been described by way of example with reference to the ffgures of the accompanying drawings. However, this is not intended to limit20 the invention only to the examples shown it the figures, but many modifications are possible within the scope of the inventhe idea defined in the enclosed patent claims.
However, these solutions have not eliminated the problem, but ice blocks have still blocked the propeller nozle, since they have fastened to said prongs or circular part.
10 Attempts have previously been made to prevent the blocking of the nozzle alsoin such a way that an "ice cage" has been arranged in front of the nozzle to prevent ice blocks from entering the nozzle. However, essential drawbacks of this solution are a high resistance caused by the ice cage and its poor durability.
In addition, at high speeds the "ice cage" itself blocks in spite of whether said 15 cage is streamlined or not. The cage can fill with crushed ice, since suitably small pieces of ice can succeed in entering the gaps of the cage, but do not come into a correct position to be able to come out of a gap of the same size.
Such cages can be mounted stationary on the hull of a vessel, or e.g. in connec-tion with a turning propeller device, they can be mounted stationary on the 20 propeller device itself to turn with it. It has yet not been possible to solve the blocking prob1em by means of them, as mentioned above.
The object of the present invention is to create such a nozzle propeller device,which avoids the drawbacks related to prior art and which prevents the wedging 25 of ice b10cks between the propeller device frame and the nozzle. For achieving this, the invention is mainly characterized in that in front of a prope11er arranged to rotate inside a propeller nozzle is arranged a front piece acting as an ice crusher and provided with blades or corresponding extensions, which front piece is arranged to rotate on the same rotational shaft as the propeller.
As the most important advantage of the invention in comparison with solutions of prior art can be regarded that the solutions of prior art have been "passiw"
and tried only to prevent ice blocks from blocking the propeller device, whe-reas the device in accordance with the invention is arranged to operate "actively"
2~ ~53~7 in such a way that the inventive nozzle propeller device is provided with an arrangement, which tries to crush large ice blocks stuck in the nozzle so that they can pass through the nozzle, in which case the nozzle itself does not block.
At the same time, the crusher acts a feeder screw that packs the ice blocks to the nozzle. The other advantages and characteristics of the invention are presented in the following more detailed description of the invention.
The invention is next described in more detail with reference to the figures of the accompanying drawing.
Fig. 1 is a schematic side view of an inventive nozzle propeller device in the form of a turnable propeller device.
Fig. 2 corresponds to Fig. 1 seen from view D.
Fig. 3 is a schematic sectional view of a propeller device of Fig. 1 and 2 and shows an alternative embodiment of a driving system of the propeller device.
Fig. 4 shows schematically the inventive nozzle propeller device in connection with a conventional unturnable propeller drive.
In Fig. 1-3 of the drawing, the inventive nozle propeller device is marked generally by a reference number 10. The type of the nozle propeller device 10 of Fig. 1-3 is e.g. such a turnable propeller device, which is described previously in the Finnish patent applications no. 830373 and 853173. The propeller device thus comprises a frame 11, to which a propeller nozzle 12 is fastened by means of a support construction 13. A propeller 14 is fastened rotatively inside the propeller nozzle 12. Power is supplied to the propeller device 10 by a vertical shaft 18, which drives by means of an bevel gearing 20 a propeller shaft 22, to which a hub 15 is fastened and which is rotatively mounted on an bevel-gearing frame 21.
In conventional propeller devices, the front part of the bevel-gearing frame is formed as a streamlined front dome, but in the solution in accordance with the 2 ~ 7 invention the front dome is replaced by a rotating front piece 16, to whose surface blades 17 are fastened. The front piece 16 is arranged tO rotate with the propeller 14 around a cornmon rotational shaft S-S. The front piece 16 can be mounted freely rotatively on the propeller device frame 11, but in the most 5 preferable embodiment of the invention the front piece is arranged to be driven.
The purpose of the front piece and the blades 17 fastened thereto is to produce movement in the ice blockage in front of the propeller nozzle 12 and crush the ice blocks in front of the propeller nozzle 12 in such a way that they can pass through the propeller nozzle 12 or are guided outside the propeller nozzle. The 10 blades 17 can be e.g. straight or prong-like, in which case they act only as an ice crusher, but on the other hand, they can be arranged, as shown in the figure, inan ascending form, whereby they in a way act as a second propeller and as a device guiding the crushed ice. In the figures of the drawing, the blades 17 areshown to have a fairly small size, but their size can also be considerably larger 15 than that shown in the figures, which improves their propelling and crushing effect.
The propeller nozzle 12 is in a conventional manner formed in such a way that it narrows from its leading edge 12a, until it after the narrowest point of the 20 propeller nozzle 12, which is marked in the figures of the drawing with a reference A, continues mainly cylindrical to the trailing edge 12b of the propel-ler nozzle. In order that the front piece 16 with its blades 17 would act in theintended manner, it is placed with respect to the propeller nozzle 12 in such a way that it is located at the narrowest point A of the propeller nozzle 12, at the 25 start of the cylindrical portion or on its front side. This ensures that the ice blocks are crushed so small that they can pass through the narrowest point A of the propeller nozzle 12.
It was mentioned above that the front piece 16 acting as an ice crusher can be 30 arranged freely rotatively in the propeller device 10, but in its most preferred form it is driven. Fig. 3 shows an alternative embodiment of a drive of the front piece 16 acting as an ice crusher. As mentioned above, in the embodiment of Fig. 3 power is supplied to the propeller shaft 22 on a vertical shaft 18 via a bevel gearing 20. The bevel gearing 20 is comprised of a first bevel gear 19 on 2 ~ 7 the vertical shaft 18 and of a second bevel gear 23 on the propeller shaft 22. In the embodiment of Fig. 3, the propeller shaft is extended past the front bearingpoint to the front side of the bevel-gearing frame 21, and the front piece 16 acting as an ice crusher is fastened in a suitable manner to said propel1er shaft 5 22. In the solution of Fig. 3, the front piece 16 acting as an ice crusher thus rotates in the same direction as the propeller 14 and at the same rotational speed.
The solution of Fig.3 may be regarded as the best embodiment of the invention, 10 since its construction is the simplest and thereby the most reliable in operation.
However, the drive of the front piece 16 acting as an ice crusher can be ar-ranged mechanically for example so that the front piece 16 is arranged to rotatein an opposite direction relative to the propeller 14. The drive of the front piece can then be realized in a known manner, as according to a Finnish patent application no. 861798. The construction of the propeller device will then yet be more complicated than the construction of Fig. 3. However, the rotation of the front piece 16 can be arranged also e.g. electrically, hydraulically or in some other non-mechanical manner. Such modes of operation nevertheless further increase the complexity of the construction of the propeller device 10 and are 20 thus more expensive than a mechanical mode of operation.
Fig. 1-3 show the use of the front piece 16 acting as an ice crusher in connection vrith a turnable propeller device 10 provided with a bevel gearing 20. However, the invention can also be applied to conventional nozzle propeller devices, and 25 an attempt is made to illustrate this schematically in Fig. 4. In Fig. 4, the hull of the vessel is marked with a reference number 5. Power is supplied to a propeller34 via a propeller shaft 42, which is in a conventional manner mounted on the vessel hull 5. Around a propeller 34 is arranged a propeller nozzle 32, which isin a suitable manner fastened to the vessel hull 5. Fixing elements are not shown 30 in Fig. 4. In the embodiment of Fig. 4, the propeller shaft 42 is extended from the vessel hull 5 by such a distance that it has been possible to place between the propeller and the hull S a front piece 36 provided with blades 37, which is in a suitable manner fastened to the propeller shaft 42, to which also a propeller hub 35 is fixed. In the embodiment of Fig. 4, the front piece 36 acting as an ice 2~S~7 crusher thus rotates together with the propeller 34. As regards the location of the front piece 36, the same principle as that described above is followed, i.e.the front piece is placed at the narrowest point A of the propeller nozzle 32 oron its front side.
s In Fig. 4, the nozzle propeller device is generally marked with a reference number 30 and the leading edge of the propeller nozzle 32 with a reference number 32 and the trailing edge with a reference number 32b. Although the inventive nozzle propeller device 30 can also be realized as a conventional 10 solution according to Fig. 4, problems may however occur in this connection e.g.
with respect to the bearing arrangement of the propeller shaft 42, since the propeller shaft 42 is extended longer th~n in conventional solutions. As a result, the solution according to the invention can be regarded as the most preferable in the embodiment of Fig. 1-3. In Fig. 1-3, the use of the invention is more 15 preferable also because the front piece 16 and the blades 17 therein can be formed more freely than in the solution of Fig. 4.
The invention has above been described by way of example with reference to the ffgures of the accompanying drawings. However, this is not intended to limit20 the invention only to the examples shown it the figures, but many modifications are possible within the scope of the inventhe idea defined in the enclosed patent claims.
Claims (10)
1. A nozzle propeller device, which propeller device (10,30) comprises a propel-ler nozzle (12,32), inside which is arranged a propeller (14,34) driven by a propeller shaft 22,42), characterized in that in front of the propeller (14,34) arranged to rotate inside the propeller nozzle (12,32) is arranged a front piece(16,36) acting as an ice crusher and provided with blades (17,37) or correspond-ing extensions, which front piece is arranged to rotate on the same rotational shaft (S-S) as the propeller (14,34).
2. A device according to Claim 1, characterized in that the front piece (16,36) acting as an ice crusher and provided with blades (17,37) or corresponding extensions is provided with a drive.
3. A device according to Claim 1, characterized in that the front piece (16,36) acting as an ice crusher and provided with blades (17,37) or corresponding extensions is freely rotative.
4. A device according to Claim 1 or 2, characterized in that the front piece (16, 36) acting as an ice crusher is arranged to rotate in the same rotational direction as the propeller (14,34).
5. A device according to Claim 4, characterized in that the front piece (16,36) is fastened to the propeller shaft (22,42) to rotate with it.
6. A device according to Claim 1 or 2, in which the driving power is supplied tothe propeller shaft (22) via a vertical shaft (18) and a bevel gearing (20), characterized in that the front piece (16) acting as an ice crusher and providedwith blades (17) is arranged to rotate in an opposite rotational direction relative to the propeller (14).
7. A device according to Claim 1 or 2, characterized in that the front piece (16) acting as an ice crusher is provided with an electric drive.
8. A device according to Claim 1 or 2, characterized in that the front piece (16) acting as an ice crusher is provided with a hydraulic drive.
9. A device according to any of the preceding Claims, characterized in that the front piece (16,36) acting as an ice crusher is placed in the axial direction at the narrowest point (A) of the propeller nozzle (12,32) or on its front side.
10. A device according to any of the preceding Claims, characterized in that theblades (17,37) of the front piece (16,36) are arranged in an ascending form in such a way their direction deviates from the direction of the rotational shaft (S-S).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI894407A FI91513C (en) | 1989-09-18 | 1989-09-18 | Nozzle propeller assembly |
| FI894407 | 1989-09-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2025507A1 true CA2025507A1 (en) | 1991-03-19 |
Family
ID=8529010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2025507 Abandoned CA2025507A1 (en) | 1989-09-18 | 1990-09-17 | Nozzle propeller device |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2025507A1 (en) |
| FI (1) | FI91513C (en) |
| SE (1) | SE503440C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012008901A1 (en) * | 2010-07-12 | 2012-01-19 | Rolls-Royce Aktiebolag | A propulsion unit for a marine vessel and a marine vessel having a propulsion unit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI96590B (en) * | 1992-09-28 | 1996-04-15 | Kvaerner Masa Yards Oy | Ship's propulsion device |
| RU2126762C1 (en) * | 1997-09-15 | 1999-02-27 | Центральный научно-исследовательский институт им.акад.А.Н.Крылова | Shipboard screw-rudder |
-
1989
- 1989-09-18 FI FI894407A patent/FI91513C/en not_active IP Right Cessation
-
1990
- 1990-09-17 SE SE9002948A patent/SE503440C2/en not_active IP Right Cessation
- 1990-09-17 CA CA 2025507 patent/CA2025507A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012008901A1 (en) * | 2010-07-12 | 2012-01-19 | Rolls-Royce Aktiebolag | A propulsion unit for a marine vessel and a marine vessel having a propulsion unit |
| CN103097238A (en) * | 2010-07-12 | 2013-05-08 | 罗尔斯-罗伊斯股份公司 | A propulsion unit for a marine vessel and a marine vessel having a propulsion unit |
| RU2584038C2 (en) * | 2010-07-12 | 2016-05-20 | Роллс-Ройс Актиеболаг | Sea vessel to operate in ice conditions |
| CN103097238B (en) * | 2010-07-12 | 2016-09-21 | 罗尔斯-罗伊斯股份公司 | There is the marine ship of propulsion unit |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9002948D0 (en) | 1990-09-17 |
| FI894407A (en) | 1991-03-19 |
| FI91513B (en) | 1994-03-31 |
| SE503440C2 (en) | 1996-06-17 |
| FI91513C (en) | 1994-07-11 |
| SE9002948L (en) | 1991-03-19 |
| FI894407A0 (en) | 1989-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH1076995A (en) | Propulsion device | |
| SE433599B (en) | DOUBLE PROPELLER DRIVE FOR BATAR | |
| SE508314C2 (en) | Propeller Drive Installation | |
| FI76747B (en) | ELEKTRISKT DRIVEN FARTYGSPROPELLER. | |
| CA2025507A1 (en) | Nozzle propeller device | |
| US3918389A (en) | Marine steering and propulsion device | |
| JPS62273194A (en) | Propeller device for ship | |
| CN215367167U (en) | Anti-winding crushing cleaning device for cleaning ship | |
| US4236872A (en) | Marine propeller fish line and weed cutter | |
| US6244912B1 (en) | Strut-mounted marine propulsion unit | |
| RU2304545C2 (en) | Propulsion plant device | |
| GB2168763A (en) | Vertically mounted wind generator | |
| KR20010015586A (en) | Propulsion system and method | |
| US3076427A (en) | Marine propulsion apparatus | |
| EP0296598A1 (en) | Propulsion auxiliary device | |
| BE903770A (en) | MARINE PROPULSION DEVICE WITH FLOATING MOTOR SHAFT. | |
| US3150631A (en) | Demountable stern drive assembly | |
| US4461620A (en) | Propulsion device and a method of propelling a nautical vessel | |
| ATE112979T1 (en) | IMPACT CRUSHER. | |
| US5407373A (en) | Propulsion system for water vessels | |
| KR20100053999A (en) | Ship having contra-rotating gear set | |
| US7040941B2 (en) | Vessel propulsion system | |
| JPH09193894A (en) | Traction type pump jet device | |
| EP0054339A2 (en) | Hydrodynamic machine for high flow capacity | |
| KR101404504B1 (en) | Propulsion apparatus for a ship |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |