GB2088309A - A water jet unit for ships - Google Patents
A water jet unit for ships Download PDFInfo
- Publication number
- GB2088309A GB2088309A GB8135508A GB8135508A GB2088309A GB 2088309 A GB2088309 A GB 2088309A GB 8135508 A GB8135508 A GB 8135508A GB 8135508 A GB8135508 A GB 8135508A GB 2088309 A GB2088309 A GB 2088309A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hub
- housing
- water
- pump
- impeller
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H11/00—Marine propulsion by water jets
- B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
- B63H11/10—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof
- B63H11/107—Direction control of propulsive fluid
- B63H11/113—Pivoted outlet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H11/00—Marine propulsion by water jets
- B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
- B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
- B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A water jet unit comprises a propeller pump having a pump housing (6) connected on its inlet side with an inlet channel (3) and on its outlet side with a water jet directing outlet means (16). The pump housing has a hub housing (8) which is arranged centrally in the flow path of the water through the pump housing and which is carried by guide vanes (9) extending radially between the wall of the pump housing and the hub housing. An impeller (11) is mounted on the end of a pump shaft (10) extending into the pump housing through the inlet channel and is journalled in the hub housing by means of an axial bearing (21) and a radial bearing (20). Both bearings are spherical and have a substantially common centre of curvature.
Description
SPECIFICATION
A water jet unit for ships
The present invention relates to a water jet unit for ships.
In particular the present invention relates to a water jet unit of the kind comprising a propeller having a pump housing connected at its waterinlet side to a water-inlet channel and at its outlet side to water--jet directing means. Arranged centrally in the path of the water flow path through the pump housing is a stationary hub housing in which an impeller is journalled on one end of a pump shaft extending through the waterinlet channel. Such water-jet units are known to the art.
One serious problem presented by such waterjet units is the journalling of the pump shaft and the impeller mounted thereon in the pump housing. For example, in order to ensure high pump efficiency, it is necessary for the outer extremities of the impeller blades to pass very closely to the inner surface of the surrounding wall of the pump housing. This means that the bearing in which the impeller and said end of the pump shaft are journalled must be so precise as to exclude the possibility of the impeller blades from contacting the wall of the pump housing. Since the pump shaft extends over a considerable distance from the pump housing to its nearest bearing location within the ship, it is difficult to journal said impeller and the end of said drive shaft in the aforedescribed precise manner, which in turn presents considerable difficulties in positioning the impeller accurately.Further, although the impeller may be accurately positioned initially, this positioning may be disturbed by movement in the actual hull of the ship and as a result of movement of the ship's machinery, which is often resiliently mounted in the ship.
Consequently, an aim of the present invention is to provide a water jet unit of the aforedescribed kind in which the bearing in which the impeller and said end of the pump shaft are journalled is so constructed as to prevent the same from being detrimentally affected by deviations of the drive shaft from a theoretically correct position.
According to the present invention there is provided a water jet unit for ships, comprising a propeller pump which includes a pump housing having water-inlet means and water-outlet means; a water-inlet channel connected to the water-inlet means of said pump housing; a water-jet directing outlet means connected to the water-outlet means of said pump housing; a stationary hub housing centrally arranged in the flow path of the water through the pump housing: a pump which extends through said inlet channel and into said pump housing; and an impeller which is mounted on the pump shaft located in said pump housing, and which is journalled in the hub housing by means of a spherical axial bearing and a spherical radial bearing having substantially coinciding centres.
In accordance with one embodiment of the present invention the water jet unit further comprises a dish-shaped impeller hub attached to said drive shaft; impeller blades carried on the outer surface of said hub; and rotatabie sealing means arranged on the outer peripheral surface of said hub and facing said hub housing, said sealing means sealing against the hub housing so as to form a space between said hub housing and the impeller hub; communication means being provided in the impeller hub in the proximity of the pump shaft, for allowing communication between said space and the suction side of the impeller.
In another advantageous embodiment of the present invention, the hub housing is filled with oil, which oil is circulated in the hub housing by means of the axial bearing.
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Figs. 1 a, 1 b and 1 c when laid end-to-end show a sideview in axial section of an exemplary embodiment of a water jet unit according to the present invention.
The water jet unit shown in the accompanying drawings is mounted in the stern of the ship, of which only the transom 1 and the bottom 2 are schematically indicated by chain lines. The water jet unit includes an inlet channel 3, which extends from a water intake 4 located in the bottom of the ship, to the transom 1, where said inlet is connected to a mounting flange 5 for mounting the pump housing 6 of the water jet unit. The intake 4 is provided with a grill 7 which prevents objects which might damage the water jet unit from being drawn thereinto.
The pump is a propeller pump having a hub or bearing housing 8 which is arranged centrally in the path of the flow of water through the pump housing 6 and which is supported by guide vanes 9 which extend between the inner surface of the wall of the pump housing 6 and the outside of the hub housing 8. An impeller 11 mounted on one end of a pump shaft 10 is journalled in the hub housing 8. The pump shaft 10 extends into the pump housing 6 through the inlet channel 3, and is enclosed by a sleeve 12 for reducing the effect of the rotating pump shaft 10 on the flow of water through the inlet channel 3. The pump shaft 10 is sealed externally of the inlet channel 3 by means of a seal or packing 13, the seal housing of which is connected to the sleeve 12 by means of a flexible sleeve 1 2a, thereby reducing the degree of accuracy to which the inlet channel 3 need be made.The pump shaft 10 is connected to a driving machine or prime mover (not shown) located within the ship.
The pump housing 6 is connected on its outlet side with an outlet pipe 15 in which there is mounted a jet directing nozzle 1 6. For the purpose of steering the ship, the jet nozzle 1 6 can be swivelled laterally about vertical pivots 1 7 by means of hydraulic motors not shown in the drawing.For the purpose of reversing the direction of thrust produced by the unit, so as to retard the
speed of the ship or to reverse its direction of
movement, a bucket 1 8 can be progressively
swung from a inactive position in which the whole
of the water jet from the unit is directed
immediately rearwardly for full forward movement
into the jet nozzle 16, to a fully inwardly swung
maximum, active position in which the whole of the water jet is deflected by means of the bucket
18 obliquely downwardly and forwardly, for full movement rearwards. By adjusting the bucket 1 8 to intermediate positions between the two said extreme positions, it is possible to deflect a desired part of the water jet so as to obtain a desired forward acting or rearward acting propelling force.
The impeller 11 includes a dish-shaped hub 1 a which is concave when seen from the hub housing 8 and which carries on its outer surface impeller blades 1 b. The impeller hub 1 a is mounted on a sleeve 19, which is mounted on the end of the pump shaft 10 by means of a spline coupling and journalled in the hub housing 8 by means of a radial bearing 20 and an axial bearing 21. Both the radial bearing 20 and the axial bearing 21 are spherical and are so designed and arranged as to have the same centre of curvature, whereby the bearings are substantially unaffected by any deviations of the alignment of the pump shaft 10 from the theoretical, correct alignment.
Such deviations can readily occur as a result of inaccuracies when building the hull of the ship and mounting the water jet unit and its prime mover in the ship, and may also occur during operation of the unit, as a result of movement in the ship's hull and of the prime mover, which is often resiliently mounted in the ship.
For the purpose of reducing the axial load on the impeller 11 the impeller hub 1 a is provided around its periphery with a labyrinth seal 22 which rotates relative to the hub housing 8, so that a space 23 is presented between the hub housing 8 and the impeller hub 11 a, said space communicating with the suction side of the impeller 11 through openings 24 arranged in said hub in the proximity of the pump shaft.
The interior of the hub housing 8 is filled with lubricating oil under a static overpressure derived from an oil tank located at a higher level than said hub housing. In order to effectively cool the oil in the hub housing 8, the oil is constantly circulated, in that the end of the pump shaft 10 is provided with a bore 25 which communicates, via holes 26, with an annular space 27 between the outside of the shaft 10 and the inside of the sleeve 1 9, said space 27 communicating in turn with the interior of the axial bearing 21 through holes 28 arranged in the wall of sleeve 1 9. Oil is circulated within the hub housing 8 by means of the axial bearing 21 as the impeller 11 rotates, as indicated by arrows 29.
Claims (4)
1. A water jet unit for ships, comprising a
propeller pump which includes a pump housing
having water-inlet means and water-outlet means;
a water-inlet channel connected to the water-inlet
means of said pump housing; a water-jet directing
outlet means connected to the water-outlet
means of said pump housing; a stationary hub
housing centrally arranged in the flow path of the water through the pump housing; a pump shaft which extends through said inlet channel and into said pump housing; and a impeller which is mounted on the end of the pump shaft located in said pump housing, and which is journalled in the
hub housing by means of a spherical axial bearing and a spherical radial bearing having substantially coinciding centres.
2. A water jet unit as claimed in claim 1, further comprising a dish-shaped impeller hub attached to said drive shaft; impeller blades carried on the outer surface of said hub; and rotatable sealing means arranged on the outer peripheral surface of said hub facing said hub housing, said sealing means sealing against the hub housing so as to form a space between said hub housing and the impeller hub; and communication means being provided in the impeller hub near to the pump shaft, for allowing communications between said space and the suction side of the impeller.
3. A water jet unit as claimed in claim 1 or claim 2, in which the hub housing is filled with lubricating oil arranged to be circulated within the hub housing by the action of said axial bearing.
4. A water jet unit for ships, constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8008288A SE424845B (en) | 1980-11-26 | 1980-11-26 | SHIRT OPERATING UNIT |
| SE8102714A SE449333B (en) | 1980-11-26 | 1981-04-29 | Jet propulsion |
| SE8106979A SE449463B (en) | 1981-11-24 | 1981-11-24 | Water jet unit for ship |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2088309A true GB2088309A (en) | 1982-06-09 |
| GB2088309B GB2088309B (en) | 1984-05-31 |
Family
ID=27355232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8135508A Expired GB2088309B (en) | 1980-11-26 | 1981-11-25 | A water jet unit for ships |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3146370A1 (en) |
| FR (1) | FR2494661B1 (en) |
| GB (1) | GB2088309B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3735699C2 (en) * | 1987-10-22 | 1999-08-26 | Schottel Werft | Water jet propulsion for water vehicles |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR672648A (en) * | 1928-07-11 | 1930-01-04 | Hydraulic boat thruster | |
| US1867081A (en) * | 1930-02-14 | 1932-07-12 | Mclanahan & Stone Corp | Grinding pan |
| US3680315A (en) * | 1970-10-12 | 1972-08-01 | Twin Disc Inc | Hydraulic jet propulsion apparatus |
| DE2341945C3 (en) * | 1973-08-20 | 1979-08-30 | Fa. Franz Berrenberg, 5657 Haan | Friction disc screw press |
-
1981
- 1981-11-23 DE DE19813146370 patent/DE3146370A1/en not_active Withdrawn
- 1981-11-25 GB GB8135508A patent/GB2088309B/en not_active Expired
- 1981-11-25 FR FR8122096A patent/FR2494661B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2494661A1 (en) | 1982-05-28 |
| GB2088309B (en) | 1984-05-31 |
| DE3146370A1 (en) | 1982-10-21 |
| FR2494661B1 (en) | 1989-05-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20011124 |