WO2013135796A1

WO2013135796A1 - Ship drive having a hubless propeller

Info

Publication number: WO2013135796A1
Application number: PCT/EP2013/055199
Authority: WO
Inventors: Nicky Wolter; Christian GIERER; Torsten PREUSS; Jürgen Friedrich
Original assignee: Voith Patent Gmbh
Priority date: 2012-03-15
Filing date: 2013-03-14
Publication date: 2013-09-19
Also published as: DE102012005055A1

Abstract

The invention relates to a ship drive having a hubless propeller, comprising the following components and characteristics: - a rotor (1) having a rotor ring (3) made of carbon steel; - a plurality of rotor blades borne by the rotor ring, which point radially inward; - a stator having a laminated stator core; - a plurality of permanent magnets (6) borne by the rotor ring; - end-face carrying rings (4) that bear the rotor ring having the permanent magnets; wherein the permanent magnets are located in a hermetically sealed space that is closed off radially inwardly by the rotor ring and radially outwardly by a stainless steel sleeve (7); and wherein the stainless steel sleeve is connected to the carrying rings in a rigid and hermetically sealed manner at the two axial ends of the stainless steel sleeve.

Description

Ship propulsion with a hubless propeller

The invention relates to a ship propulsion system with a hubless propeller. Such propellers have become known from EP 1 739 007 AI.

They serve as the main propulsion for ships, but also as transverse jet propulsion systems. They are particularly suitable for bugging ships and are therefore successfully used in yachts and tugs, but also in drilling platforms.

The essential components of a hubless propeller are the following:

A rotor has a plurality of rotor blades which point radially inwards. The rotor carries a variety of permanent magnets. A stator surrounds the rotor. The stator has or consists of a stator laminated core.

The problem with such hubless propellers is the cooling. During operation, large amounts of heat are generated, which must be reliably dissipated. Seawater is used as coolant. This has corrosive properties. Therefore, there is another problem in the corrosion of the water wetted components.

The invention has for its object to make a marine propulsion with a hubless propeller of the above type such that it can achieve an efficient cooling with seawater, and that at the same time the corrosion problem is solved.

This object is achieved by a ship propulsion system according to claim 1. The invention is explained in more detail with reference to the drawing. The following is shown in detail:

FIG. 1 shows a schematic very general representation of one

hooligan propeller.

Figure 2 shows in an axial section in an enlarged view essential

Components of the rotor of the propeller according to FIG. 1

Figure 3 shows a schematic representation of a bow control device, again in an axial section.

FIG. 4 shows in a 3D view an enlarged detail of FIG

Rotor.

Figure 5 shows a magnified section of the in a 3D view

Rotor with a different type of fastening of the rotor blades.

The hubless propeller shown in Figure 1 comprises a rotor 1 and a stator 2. The propeller can serve as a main propulsion for a ship. He can also serve the lateral control of a ship. Thus, it can be installed in the hull of a ship and produce in operation a jet of water that runs horizontally and perpendicular to the longitudinal axis of the ship and exits to port or starboard from the ship's skin.

The rotor shown in Figure 2 is constructed as follows:

It comprises a rotor ring 3 made of carbon steel. This is at its two axial ends of two support rings 4 made of stainless steel or a

worn corrosion-resistant carbon steel. The connection between Rotor ring 3 and 4 support rings, for example, a welded joint - see the weld 5. However, another type of connection is conceivable.

Rotor ring 3 carries a plurality of permanent magnets 6. These have

For example, rod shape and can be arranged axially parallel or perpendicular to the axis.

The magnets are covered by a stainless steel sleeve 7. This is fixed with its axial end portions of the support rings 4, 4. As you can see, they are

End portions of the stainless steel sleeve 7 on the lateral surface of the two support rings 4, 4.

The fixation can be done by laser welding. The weld 8 is located in the axial direction as far as possible at the end of the two support rings 4, 4. This results in welding only a small amount of heat in the region of the permanent magnets 6, and thus does not affect their magnetic force. The welding process using a laser welding process also contributes to this. Instead of laser welding or in addition to stainless steel sleeve 7 and the support rings 4, 4 are also glued together. A shrinking of the stainless steel sleeve 7 is conceivable. Also, two or three of these mentioned methods can be used.

Between the stainless steel sleeve 7 and the outer surfaces of the

Permanent magnets 6 remains a gap of, for example, 2 mm. Also, the gap may have a lower thickness, for example, up to 0.5, or a greater thickness, for example, up to 5 mm.

All clearances between sleeve, magnet carrier and magnets are filled with a mass such as a resin-hardener mixture. The rotor blades are not shown here. They extend radially inwards towards the axis of rotation.

Rotor 1 is enclosed by the stator 2. The stator is not shown here.

Figure 3 shows a hubless propeller according to the invention as part of a transverse jet propulsion. This is installed in the bow of a ship. The axis of rotation of the hubless propeller 1.3 also runs perpendicular to the ship's longitudinal axis.

The transverse jet drive is seated in a Strömungsleitgehäuse 10, which in turn is arranged in a tunnel, see the tunnel wall 11, which is part of the ship. The Strömungsleitgehäuse 10 is formed nozzle-like at its two ends. See the two nozzles 10.1 and 10.2. The nozzles 10.1 and 10.2 are associated with current-carrying strips 12, which form a grid with each other.

From this figure one also recognizes the rotor blades 1.1. Between the free ends there is a space through which water during operation

can flow through it.

Accurate positioning of the transverse jet propulsion relative to the ship is important. It is therefore important to position the Strömungsleitgehäuse 10 accurately and correctly relative to the tunnel channel, both in the direction perpendicular to the axis of rotation 1.3, as well as parallel thereto.

For positioning perpendicular to the axis of rotation (in the radial direction) a plurality of positioning devices 13 are provided. These include radially displaceable punch 13.1. In this way, the flow guide housing 10 can be accurately and reliably fixed to the tunnel wall 11 in the radial direction. For positioning and fixing in the axial direction fixing screws 14 are provided.

Very important for a hooligan propeller of the type described here is reliable and adequate cooling. Such is primarily made possible by the fact that between the flow guide 10 and the

Tunnel wall 11 is an annulus. This is the operation of the

Transverse jet drive flows through water, which serves as cooling water. The flow of cooling water runs in the opposite direction to the current generated by the transverse jet output. Assuming that the main flow direction generated by the propeller runs from left to right in the figure, the cooling water flow in the figure flows from right to left. He enters in the area between the stator housing and Strömungsleitgehäuse in said annulus. He then flows through this, and in this case runs between the tunnel wall 11 and the stator 2, more precisely a stator housing 2.1.

In addition, there is a further flow of water, between the rotor 1 and stator 2. Between these two there is a gap 15. This gap flow contributes significantly to the cooling of the rotor and stator formed motor. It thus runs in addition to the above-mentioned flow between tunnel wall 11 and stator housing 2.1.

However, the following effect occurs: The water flowing between the rotor 1 and the stator 2 causes a circulation flow. This partial flow thus runs after flowing through the annular gap between the rotor 1 and stator 2 radially inwardly. Then it runs parallel to the ring flow, but in the opposite direction, then pivots radially outward, and in turn enters the annular gap between the rotor 1 and stator 2 a. By the described

Flow course takes place intensive cooling of the engine. Figure 4 shows a rotor blade 1.1, which is supported by a curved support plate 1.2. These two are in one piece in the present case. The support plates are assembled in the assembled state to form a ring. Each individual support plate is only fixed to the support rings.

In the embodiment according to FIG. 5, a clamping strip 16 is provided between two respective support plates 1.2. Only one of the support plates is shown. The

Terminal block has a dovetailed cross-section, and the edges of the adjacent support plates thus form a wedge-gap with each other. The terminal strips thus serve to tighten the support plates.

The embodiment of a marine propulsion system according to claim 1 fulfills the

Requirements in a perfect way.

Crucial components of the rotor are seewasergeschützt. this applies

especially for the permanent magnets. The design of the room in which the magnets are located, their induction and their magnetic force are not affected. The entire structure of the rotor is very simple and therefore inexpensive.

Reference number list

rotor

rotor blade

support plate

axis of rotation

stator

rotor ring

support ring

Weld

permanent magnet

stainless steel sleeve

Strömungsleitgehäuse

jet

tunnel wall

Current guide rail

positioning

stamp

terminal block

Claims

claims

1. Ship propulsion with a hubless propeller, comprising the following components or features:

1.1 a rotor (1) with a rotor ring (3) made of carbon steel;

1.2 a plurality of rotor blades (3) carried rotor blades facing radially inward;

1.3 with a stator and a laminated stator core;

1.4 a plurality of rotor ring (3) supported permanent magnets (6);

1.5 end bearing rings (4), the rotor ring (3) with the

Wear permanent magnets (6);

1.6 the permanent magnets (6) are in a hermetic

enclosed space which is shut off radially inwardly by the rotor ring (3) and radially outwardly by a stainless steel sleeve (7);

1.7 the stainless steel sleeve (7) is firmly and hermetically sealed at its two axial ends with the support rings (4).

2. Ship propulsion system according to claim 1, characterized in that the

Connection between stainless steel sleeve (7) and the support rings (4) by laser welding or by gluing or by shrinking or by two or three of these measures is made.

3. Marine propulsion system according to claim 1 or 2, characterized by the following features:

3.1 each rotor blade (1.1) is firmly connected with its foot with a curved support plate (1.2);

3.2 the curvature of the support plate (1.2) corresponds to the curvature of

Rotor ring (3);

3.3 in the assembled state, the support plates (1.2) to a ring

together.

4. Ship propulsion system according to claim 3, characterized in that each support plate (1.2) carries more than one rotor blade.

5. Ship propulsion system according to claim 3 or 4, characterized in that each support plate (1.2) is fixed only to the support rings (4).

6. Ship drive according to one of claims 1 to 5, characterized in that the support plate (1.2) are fixed directly on the rotor ring (3).