KR100655006B1 - Seagoing high-speed ship - Google Patents

Abstract

The invention relates to an electric rudder propeller for a high-speed marine ship, comprising a multi-phase electric motor which is mounted in a gondola-shaped housing beneath the stern of the ship, using a rotatable, preferably two-part shaft. Said motor can be supplied with electric drive energy by means of a slip ring assembly and can be rotated using drive motors. The rudder propeller is mounted in close proximity to the outer hull (6) in the stern of the ship, in particular, above the water line, using a flat ring bearing (7). The slip ring assembly (8) is located in the upper section (3) of the shaft (2, 3) at the level of the ring-shaped bearing (7) and the drive motors for the rotational movement (9) are low in design and are located at least partially in the interior of the ring bearing (7).

Description

High speed sailing ship {SEAGOING HIGH-SPEED SHIP}

The present invention relates to a high speed nautical vessel having an electric rudder propeller with a polyphase electric motor, said electric rudder propeller being mounted below the stern by a rotatable shaft, preferably in a gondola type housing. It is composed of two parts and can be supplied with electric drive power by a slip ring arrangement and can be rotated by a drive motor.

A corresponding electric rudder propeller is known from Canadian Patent No. 1,311,657 A, wherein the shaft of the propeller is tubular. The slip ring body is located above the shaft inside the ship.
In Siemens and Schottel's handbook, "The SSP Propulsor" (No. 159U559 04982, 1998/04), a rotatable rudder propeller is known, in which a slip ring that delivers electric drive power is used to provide hydraulic pressure for rotary motion. Like the drive motor and the hydraulic pump of the drive motor, it is disposed in a driver room (Propulsor 500 m) above the rudder propeller. The cable connection to the slip ring is made from above.

It is an object of the present invention to improve the known drive arrangement so that more space is provided at the stern, especially in roro ships. In the case of a Ro-Ro line, for example, a continuous car deck can be realized without the need to raise the stern door for the car deck and the car deck itself. In this case, sufficient repair and repair capacity must be maintained. In addition, the drainage state of the stern should be able to be implemented to minimize drag in consideration of the flow state given by the use of the rudder propeller.

This object is achieved by the rudder propeller being mounted above the waterline, in particular by a shallow collar near the outer skin in the stern. In this case the slip ring device is accommodated at the height of the annular bearing at the top of the shaft, and the drive motor for rotational movement is partly or wholly disposed inside the annular bearing with a low installation height. In this way a preferably low installation configuration of the electric rudder propeller is achieved according to the invention. More specifically, the electric rudder propeller cannot accommodate slip rings, drive motors for rotary motion, etc. due to the "rotary bearing" which is a narrowed point at the top of the shaft, so there may be further downward passages. However, the present invention can be realized when the size of all parts is optimized and there is little need for struts that extend horizontally. If so, the drive motor for rotational movement can be moved to the area under the slip ring device.

Ring bearings provided at low installation heights may optionally be installed above or below the water line. When installed below the draft line, it is desirable to maintain the excess pressure. The device known from Canadian Patent No. 1,311,657A is very unsuitable because the shaft is designed in such a way that it is inserted below the waterline into the ship and extends from the inside of the ship to the top of the waterline. In such a device, seawater can penetrate into the bearing.

If the shaft is mounted above the waterline in a large diameter annular bearing and the diameter of the annular bearing is greater than or approximately equal to the motor winding length, especially if the inner diameter of the annular bearing is also large, The upper part of the shaft of the propeller has a space large enough to fully accommodate the slip ring device and the rotating motor having the optimum size. This is especially true when annular bearings have large inner diameters. Therefore, very preferably, there is no need for a separate engine room above the rudder propeller, and consequently the installation height can be saved. Annular bearings may be placed directly below the car deck.

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In another embodiment of the present invention, the drive motor for rotary motion is formed as a flat radial piston motor driven hydraulically. Therefore, a particularly preferable rotating motor can be realized when the rotating motor has a small dimension and a large torque.

The present invention preferably provides the possibility that the shaft can optionally be connected to the hull just below the loading deck located at the bottom of the stern by means of an intermediate cover, for example just below the car deck in the case of a ro-ro line. The small intermediate cover part, which may be formed as a circular disc as above, gives the possibility that the electric rudder propeller is preferably not only very stable but also assembled at a low installation height. This intermediate cover part can be installed, for example, using a box-shaped assembly member, as well as in a manner that is directly attached onto the double bottom.

In particular, in the case of a ro-ro ship, it is preferable that the shaft is installed under the stern rudder propeller sealing cover, which preferably forms part of the car deck when the ship is dried by the ro-ro ship. As the utilization of the physical height available at the stern becomes very high, it is possible to drive the car directly over the inner car deck through the rear door. Since such car decks can be used over the entire length of the ship, excellent space utilization that has not been achieved conventionally is provided for the main car deck. In addition, utilization of the entire weather deck surface is ensured, preferably a capstan drive or the like may be installed under the weather deck to expand the available surface.

In an embodiment of the invention the closure cover has access openings to the individual units of the rudder propeller, such as a slip ring device, a drive motor for rotary motion and other essential functional elements. The devices can thus be accessed through an access opening similar to a manhole, so that it is not necessary to remove the sealing cover in the card deck, preferably for maintenance work and simple repairs.

In the present invention, the upper portion of the rudder propeller is sealed against fire-resistant purposes against the lowest deck of the stern area. Thus, the safety requirements of the ro-ro line or ropax line can be met without the need to change the preferred configuration of the electric rudder propeller, which only requires a minimum installation height.

The present invention also provides an electric rudder propeller in which a slip ring for power supply and monitoring of the motor is formed at least partially as a concentric slip ring. Therefore, the power and signal transmission components have a low installation structure. However, in the case of three-phase or more electric motors, for example in the case of a six-phase or twelve-phase electric motor and a split electric motor, the present invention is particularly limited in power slip formed only in three phases. Provide a power supply slipring, and branching to the motor winding system of three or more phases is made by a power semiconductor behind the slip ring device, which forms a local converter and Disposed in the shaft. Therefore, even in the case of a polyphase motor or a split motor, power supply by a slip ring body having a low installation height and having a relatively simple structure can be performed. This greatly simplifies the structure and greatly reduces the physical height of the slip ring device. The multiphase winding system can thus be powered in a preferably controlled manner. The power semiconductor can be cooled very well by a heat conducting member connected to a shaft casing that is well cooled by the circulating sea water.

The power delivery cable preferably runs from the side towards the slip ring device of the shaft. However, this requires a separate connecting member connected to the slip ring device. However, the additional costs incurred due to this can be further compensated by the in-space gains. The connecting member can preferably extend between the vehicle lanes on the car deck of the ro-ro line. Therefore, the connecting member does not reduce the low installation height of the rudder propeller.

Since the driving device for the rotary motion and the slip ring body and the like are disposed on the shaft, they should be placed close to the auxiliary device in the shaft, such as the bottom pump and oil pump. Since the shaft lower part is formed narrow (to act as a rudder) to favor the flow, in some cases the power semiconductor is also arranged on the upper part of the shaft. It is not possible to prevent the formation of heat accumulation. As a policy, at least one fan is installed at the top of the shaft, which enables air circulation, in some cases also air exchange, at the top of the shaft.

In addition, the transition from the top to the bottom of the shaft lies in the same plane on the ship's shell, which may preferably lie completely on the draft line. Thus the flange between the top and bottom of the shaft can be excluded from the flow around the hull, and the shaft can be replaced by an electric motor without having to anchor the vessel to the dock for repair. It is enough to balance on the bow of the ship to ensure a "dry" replacement.

In another embodiment of the present invention the motor shaft of the rudder propeller is inclined at an angle that substantially matches the contour of the stern. A very advantageous drainage is thus achieved in the stern area, which is very advantageously used to reduce the drag on the stern by the flow accelerated by the propeller. The rudder propeller according to the invention can then be installed further back without any adverse action by the flow. Then, the space gain is maximized by the preferred form of the rudder propeller. Therefore, as a whole, the use of the rudder propeller according to the present invention having a low installation height increases the space utilization in the stern area of the hull, unlike the rudder propeller according to the prior art, which is installed relatively deep under the ship, It is not damaged.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in more detail with reference to the drawings, which, like the dependent claims, present additional components important to the invention.

1 is a side view of the rudder propeller according to the present invention installed space-saving,

2 is a rear view of the double rudder propeller device in the stern area,

3 is a plan view of the double rudder propeller device according to FIG.

4 is a side view of the shaft top with cable supply lines on the side,

5 is a plan view of the top of the shaft corresponding to FIG. 4,

6 is a schematic cross-sectional view of an annular bearing device having a very low installation height.

1 shows an applied roro ship or ropax ship with a very low installation height between the shell 6 and the car deck 5. Except for the shaft 2 and the motor part 1, all the electric rudder propeller parts are arranged at this low installation height.

In order to implement the above installation, the following actions are taken, for example:

Between the outer shell 6 and the car deck 5 a small sized intermediate cover part 10, which is formed of an annular disc, is inserted, and a rudder propeller is installed on the intermediate cover part 10. The fixed parts of the annular bearing 7 are arranged above the middle cover part 10. In the car deck 5, a fire resistant sealing cover 4 is preferably provided, which makes it accessible to the rudder propeller unit underlying it. Into this (large) hermetic cover 4 several small covers (not shown) are inserted, which provide easy access to the main functional parts of the rudder propeller. The slipring arrangement 8 and the rotary motor 9 are located substantially inside the bearing 7 and on the shaft top 3. The annular bearing 7 comprising an intermediate lid portion 10 here formed very small is preferably arranged above the box structure 11 at the stern.

Since the large hermetic lid 4 can be supported directly or indirectly on the intermediate lid portion 10, the space under the lid 4 has a very low installation height, so that the overall installation height is optimally low. A rigid power supply cable is preferably guided from the side toward the slip ring device so that the sealing cover 4 can be gently formed and installed directly above the slip ring device.

Preferably the rudder propeller itself is inclined such that its drive shaft rises backwards. This results in improved drainage even with short stern. Since the separating flange provided between the top 3 of the rudder propeller and the shaft lies almost in the outer shell plane, if the rudder propeller is placed relatively far behind and the overall length is short in the flow around the hull The flange portion does not need to be disposed.

Since the cover 4 preferably comprises a fire-resistant seal, in the event of a fire in this part of the drive unit, the car deck placed thereon is not exposed to danger. In turn, a fire in the car deck does not impair the function of the drive system and the ship is still in a propulsion state.

The low height between the middle lid portion and the hermetic lid is also achieved by a flat radial piston motor provided for the azimuth drive and hydraulically driven. Arranged on the shaft top 3, the average voltage for the main motor, the low voltage for the auxiliary system, and the control / adjustment signal of the motor are transmitted, in particular, via the electric slip ring device 8, which consists of several parts. The rudder propeller itself can rotate 360 ° continuously. The slip rings of the slip ring device 8 are in particular arranged concentrically with each other, and signal transmission antennas (not shown in detail) are preferably located externally.

Two rudder propeller units are indicated at 18 and 19, respectively. In this structure the intermediate lid portion is preferably arranged directly above the double bottom 17. The annular bearing is fixed by means of a brace, for example, and the rotary motor is arranged in the interspace 16 under the car deck 15 in accordance with the invention, like the slip ring body. Thus, a low installation height is provided for inserting a rudder propeller placed farther back.

As can be seen in FIG. 3, auxiliary devices for the azimuth drive, such as hydraulic pumps and hydraulic pump motors, are likewise arranged in the interspace below the car deck. Rotational power is supplied to the two rudder propellers 13 and 14 via a short hydraulic line. In addition, according to the present invention, there is preferably no separate engine room above the rudder propellers 13 and 4.

In Fig. 4, 21 is a side-guided cable connection, 23 is the top cover of the slip ring device, and 22 is the top of the drive device for rotational movement. 4 shows a very good example of the low installation height achievable.

In FIG. 5, 24 represents the connecting portion of the cable connection 29, 27 represents the entry in the shaft, 26 represents the reservoir cross section, 28 represents the fan, and 30 represents the rotary motion drive device. . Since the illustrated parts all further have connection lines, terminals, fastening members, flanges and the like, it can be seen that space optimization has been achieved in connection with the present invention.

6 to 31, which show a partial cross section of an annular bearing having a low installation height in accordance with the present invention, show a portion of the hull forming the support of the annular bearing. It may be for example an intermediate cover portion, a double bottom portion or an annular portion of the ship's shell. 32 represents a card deck or a card deck cover, for example in the case of Roro. 33 represents a motor for a rotation drive fixed to the support part 37. 34 represents a drive pinion for the rotating ring 35 of the annular bearing. Finally, 36 represents the rudder propeller shaft directly connected to the rotating part of the annular bearing. Figure 6 shows an arrangement of bearings with very low installation heights, so that the connection members between the individual members, such as flanges with bolts, welded seams and the like, are not shown.

In the example shown in FIGS. 2 and 3, water flows freely into the rudder propellers 13, 14, 18 and 19. This is especially important for low vibration operation. However, a flow guide body may be arranged in front of the rudder propeller, in particular in the form of a hook with a hook end at the height of the rudder propeller shaft. This will allow the ship to go straight, improve propulsion efficiency, and improve the drainage characteristics of the stern. However, in addition to these advantages, the vibration characteristics of the drive system must also be optimized. Therefore, the flow guide body is more suitable for roro ships and not so for lofax ships or cruise ships. The optimization depends on the type, speed and application of the vessel. If a suitable optimization has been achieved, all types of vessels may have a flow guide body, which is preferably arranged in front of the rudder propeller and has a cross section in the form of a substantially droplet. Although the flow guide body increases the wetted surface area, the advantages associated with ship characteristics, drainage resistance and propulsion efficiency can offset this disadvantage. When the flow guide body is installed at a low height and, in some cases, combined with the rudder propeller according to the present invention, it is very preferable because a wet surface area is formed which can be kept small.

Claims (25)

An electric rudder propeller having a polyphase motor, mounted under the stern by a shaft, powered by a slip ring arrangement, and capable of being rotated by a drive motor. In a high speed sailing vessel comprising a rudder propeller, The rudder propeller is mounted close to the shell 6 at the stern by an annular bearing 7 of flat construction, and the slip ring device 8 is annular at the top 3 of the shafts 2, 3. It is arranged at the height of the bearing 7 and the drive motor 9 for rotational movement is at least partly arranged inside the annular bearing 7 at a low installation height, so that a compact installation configuration for the rudder propeller is achieved. Characterized in that can be, High speed sailing vessel. The method of claim 1, Characterized in that the electric rudder propeller is located below the waterline at the stern, High speed sailing vessel. The method of claim 1, The annular bearing 7 is characterized in that it is connected to the substructures of the stern by an intermediate cover part 10, High speed sailing vessel. The method of claim 3, wherein Characterized in that the intermediate cover portion 10 is connected to the structure portion of the stern by a box structure 11, High speed sailing vessel. The method of claim 3, wherein Characterized in that the intermediate cover portion 10 is connected to the double bottom 20 of the vessel, High speed sailing vessel. The method of claim 3, wherein Characterized in that the intermediate cover portion 10 can be installed just below the loading deck at the bottom of the stern, High speed sailing vessel. The method of claim 1, Said shafts (2, 3) are mounted under the sealing cover (4) of the rudder propeller at the stern, High speed sailing vessel. The method of claim 7, wherein The sealing cover 4 is characterized in that the ship is part of the car deck (5) when the ship is dried by the Ro-Ro, High speed sailing vessel. The method of claim 7, wherein Said closure cover 4 is characterized in that it has an access opening for the individual devices, High speed sailing vessel. The method of claim 1, The drive motor 9 for the rotational movement is characterized in that it is formed of a flat radial piston motor driven hydraulically, High speed sailing vessel. The method according to any one of claims 1 to 10, Said annular bearing (7) has a gearwheel for rotational movement around the rotatable ring (35), said fixed ring being connected to the hull portion (31), High speed sailing vessel. The method of claim 11, A rotary motion motor 33 is arranged below the annular bearing 7 in the upper part of the shaft 36, fixed to the support 37, and by the pinion 34 the annular bearing 7. Interlocking with said rotatable ring 35 of, High speed sailing vessel. The method of claim 1, It is characterized in that a hydraulic pump for driving the rotary motor 33 is disposed in the shaft 36, High speed sailing vessel. The method according to any one of claims 1 to 10, Power for the slip ring device is supplied by a cable running from the side toward the slip ring device to achieve a flat structure, High speed sailing vessel. The method according to any one of claims 1 to 10, Characterized in that the slip ring device comprises a connecting member 21 for the connection of a cable derived from the side, High speed sailing vessel. The method according to any one of claims 1 to 10, The electric rudder propeller is characterized in that it has at least one fan on the shaft top (3), High speed sailing vessel. The method according to any one of claims 1 to 10, Characterized in that the upper diameter of the shaft top 3 is greater than or equal to the winding length of the electric motor 1, High speed sailing vessel. The method according to any one of claims 1 to 10, The upper part 3 of the rudder propeller shafts 2, 3 is characterized in that it is sealed for fire-resistant against a deck placed thereon, High speed sailing vessel. The method according to any one of claims 1 to 10, Characterized in that the slip ring for power supply and monitoring of the motor in the slip ring device 8 is formed at least partly as a concentric slip ring, High speed sailing vessel. The method according to any one of claims 1 to 10, Characterized in that the slip ring for power supply of the electric motor is formed in two-phase or three-phase, and a branch for the motor winding system of the two-phase or more phase is made behind the slip ring device. High speed sailing vessel. The method according to any one of claims 1 to 10, Characterized in that the point of separation between the shaft top 3 and the bottom 2 lies almost in the plane of the shell 6 of the ship, High speed sailing vessel. The method according to any one of claims 1 to 10, Characterized in that a separation point between the shaft top 3 and the bottom 2 is arranged on the shell of the vessel of the shaft well of the stern, High speed sailing vessel. The method according to any one of claims 1 to 10, Characterized in that the length (2, 3) of the ship is determined so that the flow generated by the rudder propeller is formed almost in line with the stern contour, the motor shaft of the rudder propeller is installed so as to rise toward the stern, High speed sailing vessel. The method of claim 1, The electric rudder propeller is characterized in that consisting of two parts in the gondola housing, High speed sailing vessel. The method of claim 1, The electric rudder propeller is mounted above the waterline at the stern, High speed sailing vessel.

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