WO2016075230A2

WO2016075230A2 - Protective device for the sealing of a stern tube of propeller-driven ships

Info

Publication number: WO2016075230A2
Application number: PCT/EP2015/076424
Authority: WO
Inventors: Nils Böttcher; Wolfgang Brandt; Carlos Fangauf; Johannes Goetz; Detlef Hammerschmidt; Andreas Konieczny; Fred Menig; Christian Preissler; Mathias Rusch; Marko WRAGE; Lars Ziemen
Original assignee: Aktiebolaget Skf; Skf Blohm + Voss Industries Gmbh
Priority date: 2014-11-12
Filing date: 2015-11-12
Publication date: 2016-05-19
Also published as: DE102014223064B4; CN107108005A; US20170313398A1; JP6840667B2; WO2016075230A3; JP2017534524A; DE102014223064A1; KR20170088831A

Abstract

The invention relates to a protective device for the sealing of a stern tube (1) of propeller-driven ships, in which an intermediate space is provided between the stern tube (2) and the propeller hub (3), which is covered by a tubular protective jacket (4) arranged concentrically to the propeller hub. Said protective jacket is firmly anchored to the stern tube (2) and engages over the propeller hub (3) such that an annular gap (5) is left open, wherein a ring (6), which is concentric to the propeller hub (3) and has a U-shape in the radial section, is arranged in the intermediate space between stern tube (2) and propeller hub (3) inside the protective jacket (4), the U-shaped opening of the ring being directed radially outwards. The aim of the invention is to provide an easily manageable and cost-effective solution. In order to achieve said aim, the invention provides that the ring (6) consists at least partially of a material (B) which can have a pourable consistency at room temperature (T = 20 °C).

Description

PROTECTION DEVICE FOR THE STEVENROHRAB SEALING OF PROPELLER-DRIVEN VESSELS

The invention relates to a protective device for the stern tube seal of propeller-driven ships, in which between the stern tube and the propeller hub, a gap is recessed, which is covered by a tubular, concentric with the propeller hub protective jacket (hawser protection), on the one hand fixed to the stern tube is anchored and on the other hand engages over the propeller hub leaving an annular gap, wherein in the space between the stern tube and propeller hub within the protective jacket concentric with the propeller hub and arranged in a radial section U-shaped ring is arranged whose U-opening is directed radially outward.

A protective device of the generic type is known from DE 37 18 419 C2. After that, a protection system is installed on ships to protect the stern tube seal and storage. This network protection is usually flanged directly to the drive propeller. If nets and ropes are in the water, they will be wound up by the U-shaped geometry of the guard and will be received in the U-shaped configuration until they are serviced to remove the nets and ropes.

In this case, the ring is arranged and dimensioned with respect to the annular gap in such a way that any ends of fishing lines, fishing nets or similar cord-like formations possibly entered by the annular gap are caught and wound up by it. Due to the large diameter of the ring in question, the material used (mostly aluminum bronze is used for this purpose), the manufacturing process and processing arise relatively high costs, which sometimes cause the operators of ships to dispense with the network protection. Added to this is the high weight, which makes handling, assembly and maintenance of the rings more difficult. Of course, the waiver of the network protection, so on the said ring, a major threat to the ship propulsion is.

To attach the net protection, d. H. of the ring, by means of screws, a drilling pattern in the ring is required for flanging, which varies depending on the ship or the particular application. Therefore, the holes are brought in application-related shortly before delivery or installation of the network protection.

The invention is based on the object, a generic protection device for the stern tube seal propeller-powered ships so educate that the disadvantages mentioned are avoided. Accordingly, an easy to handle and cost effective solution should be created. Both the production of the network protection and its installation should thus be able to be simplified. The solution to this problem by the invention is characterized in that the ring consists at least partially of a material which at room temperature (T = 20 ° C) may have a pourable consistency. In this case, preference is given to concrete, in particular to mineral casting. The ring preferably consists of at least two ring sectors, wherein each ring sector extends around a defined circumferential angle and wherein the ring sectors are preferably connected to each other. Two, three, four, five or six ring sectors are particularly preferably provided which form the ring. The ring sectors can be aligned relative to each other with centering; the centering elements are preferably formed from a complementary profiling of the circumferentially lying end portions of the ring sectors. The ring or the ring sectors are preferably fastened by means of a screw connection to the propeller hub or to the protective jacket. It is advantageous if inserts are arranged in the ring or in the ring sectors, which are penetrated by at least one screw. The inserts are preferably at least partially surrounded by the material of the ring.

The material preferably consists of fillers and binders and, if appropriate, of additives, the filler preferably having a weight fraction of between 80% and 95%, the binder preferably having a weight fraction of between 5% and 20% and the binder preferably being composed of a resin , in particular of epoxy resin, and a hardener, in particular of an amine hardener. All components of the material together have 100% by weight.

Furthermore, it can be provided that reinforcing fibers are added to the material, in particular glass fibers, carbon fibers or metallic fibers.

As mentioned, reinforcing fibers may be added to the material of the ring. In addition to the fibers mentioned, these also include steel rods, mats, reinforcing rods, baskets, steel mesh and similar elements as are used in normal concrete. A fabric can also be incorporated in the material.

Concrete is a mixture of cement, aggregate and mixing water; where appropriate, concrete admixtures and concrete admixtures are also included. The cement serves as a binder to hold the other ingredients together. The strength of the concrete is due to crystallization of the clinker constituents of the cement under water absorption.

Fibers made of steel, plastic, carbon or glass can be added to the concrete to obtain fiber concrete.

Mineral casting (also called polymer concrete) contains, in contrast to normal concrete, a polymer, ie a plastic material, as a binder that holds the aggregate together. Cement is used in mineral casting, if at all, only as a filler and does not take binding effect. The most widely used polymer matrix for mineral casting is unsaturated polyester resin.

Mineral casting has significantly better mechanical and chemical properties than cement concrete in its field of application. The gelling time of these resins can be adjusted by the amount of catalysts and hardeners used. Epoxy resin is preferably used as the polymer, ie as a binder, in order to generate a good vibration-damping behavior. In general, all materials can be used to implement the proposed idea that can be cast "cold", that is, materials that can have a pourable consistency at room temperature (20 ° C).

The invention thus provides an effective network protection for a marine propulsion, in particular made of mineral casting available. In this case, the ring can be in one piece or segmented. For sectors (or segments) different separation geometries can be realized to facilitate the exact joining of the sectors to a complete ring; However, the exact connection for the function is not very important. The holes for attachment of the ring or the sectors of the ring can be cast in the manufacture. It is also possible to use inserts (inlays) made of different materials (eg stainless steel, brass, bronze, aluminum, fiberglass, CFK or plastic). The inlays can be designed differently, serve the power transmission of the screws and prevent the bursting of the mineral casting. In addition, other inlays can be cast with, for example, threaded bushes and bolts.

In order to take into account the varying hole pattern and to be able to cover this with only one mold, there are the following approaches:

On the one hand, slot inlays have proven their worth. These inlays can be straight or kidney-shaped bent (ie with or without a radius in the circumferential direction). They are introduced into the mineral casting and can be cast in particular. Inlays can also be designed as solid material inlays. In this case, they are made of solid material (eg bronze, brass, stainless steel, plastic), which is poured in when casting the ring or the ring sectors. The hole pattern can then be introduced after demoulding the ring or the ring sector from the mold directly to customer requirements in the solid material inlay by drilling. Such inlays must have a corresponding geometry in order to be securely anchored in mineral casting.

Also possible are eccentric inlays. In these inlays, a hole is eccentrically introduced; The inlay can be constructed in the manner of a sliding bearing. By turning a part of the inlay, the position of the hole can be changed and adjusted to the required connection geometry.

Mineral casting has only about a quarter of the density of aluminum bronze (which is 8.6 g / cm). This results in a significant weight reduction and thus advantages in handling and assembly of the ring or its sectors. Combined with the segmentation, the handling and assembly advantages expand. A manual assembly is now possible. This saves the use of cranes, lifting and assembly tools and reduces the time required.

The variant variety remains for the end user, but reduces significantly for the manufacturer of the rings. By introducing the above-mentioned inlays, it is possible to work with only one mold and still map the complete range of different drilling patterns. The result is cost and time savings.

Thus, the replacement of mineral casting instead of the previous material aluminum bronze results in a significant cost advantage.

In the drawings, embodiments of the invention are shown. Show it:

Fig. 1 in radial section a protective device for the stern tube seal a

Marine propulsion with net protection in the form of a ring, 2 shows in radial section the ring (network protection) according to a first embodiment of the invention,

3 in radial section and in front view the ring according to FIG. 2, FIG.

4 shows in radial section the ring according to a further embodiment of the invention,

5 shows a radial section through the ring according to a further embodiment of the invention,

6 is a front view of a ring sector, which is part of the ring according to a further embodiment of the invention; FIG. 7 is a front view of four ring sectors according to FIG. 6, which together form the ring;

8a,

Fig. 8b and

8c seen from a radial point of view, the joint of two adjacent ring sectors, just before their meeting at a circumferential point of the ring,

9 in radial section the ring according to another embodiment of the invention,

10 shows a radial section through the ring according to a further embodiment of the invention,

11 is a front view of the ring, wherein an insert is shown,

Fig. 12 is a front view of the ring, wherein two slots are shown for attachment, and Fig. 13 in front view of the ring, wherein an eccentric insert is shown for the attachment.

In Fig. 1, a stern tube seal 1 is seen, which is designed as a multi-lip seal and a plurality of sealing lips 13 which cooperate with a sleeve 14 which is mounted on a propeller shaft 15. The bushing 14 is connected at one end via a flange 16 with the propeller hub 3 and projects into the stern tube 2 at the other end. The intermediate space 17 formed hereby is covered by a tubular protective jacket 4, which is rigidly fastened on the one hand to the stern tube 2 and on the other hand projects beyond the propeller hub 3, leaving an annular gap 5 at a distance.

In the space 17 formed by the protective jacket 4, a U-shaped and concentric with the propeller hub 3 ring 6 is arranged, the radially outwardly, d. H. towards the protective jacket 4, is open and which is attached to the front side of the propeller hub 3 by means of a screw connection 8 indicated only schematically. The dimensions of the ring 6 are chosen so that it can accommodate in its receiving space formed by the U-shaped structure a plurality of winding layers of possibly penetrated into the annular gap 5 ends of fishing lines, fishing nets, etc. This protects the stern tube seal 1.

For details, reference is expressly made to the already mentioned above DE 37 18 419 C2.

It is essential that the ring 6 according to the invention at least partially consists of a material B, which may have a pourable consistency at room temperature (T = 20 ° C). In particular, here is thought of mineral casting. 2, the radial section of the ring 6 can be seen. It can be seen that in the ring 6 holes 10 are introduced to secure the ring 6 to the propeller hub 3 by means of screws 8 can. For assembly, a mounting hole 18 is provided in alignment with the bore 10, which is provided for the passage of a corresponding tool. From Fig. 3 shows that the ring 6 may be formed as an integral part.

In the holes 10 and insert parts 9, preferably made of metal, can be introduced or inserted during casting of the ring 6 in the mold to ensure a stable grip for the attachment of the ring 6. In particular, such a crumbling of material of the ring 6 can be avoided. FIGS. 4 and 5 show two different solutions. In FIGS. 6 and 7 it can be seen that the ring 6 can also consist of a plurality of sectors 6 ', 6 ", 6"' and 6 "", which each cover a circumferential section.

So that the individual sectors abut each other precisely in the circumferential direction and are positioned in the axial direction a (see Fig. 1), centering elements 7 can be provided, as shown for three different variants in Fig. 8a, 8b and 8c. Accordingly, the exact axial assembly of the ring sectors 6 ', 6 "can be improved by the measures presented here.

Here, the transition region between two ring sectors 6 ', 6 "is shown, with the view being sketched from the radial direction As can be seen from the three views according to FIGS. 8a, 8b and 8c, the joints are not flat, but are stiffened or stiffened Fig. 8a) or in the manner of an arrow design (see Fig. 8b and Fig. 8c) .The last two possibilities mentioned ensure the exact axial merging of the two abutting ring sectors 6 'and 6 ", so that When assembling the ring sectors, the individual parts are precisely aligned with each other.

This results in a better mountability especially with only two segments or sectors. Furthermore, there is a simple possibility of centering the sectors relative to one another.

In Fig. 9, an insert 9 is again outlined, which was poured in the casting of the ring 6 and its sectors. In Fig. 10 it can be seen how said insert part 9 was then pierced in order to secure the ring 6 according to a desired Bohrbild. For this purpose, it can be seen in FIG. 11 that an insert part 9 can be provided which has different bores and thus makes it possible to screw on the ring 6 within the scope of a certain variability.

The variability is further increased if, as can be seen in FIG. 12, oblong holes 11 are provided, which are here kidney-shaped and thus make it possible for the ring 6 to be tightened in a simpler manner.

For this purpose, Fig. 13 shows yet another possibility: Here, an insert in the form of an eccentric insert 12 is provided. This insert is designed in the manner of a plain bearing and has two rings that can be rotated relative to each other (see arrow in Fig. 13). By rotating the inner ring of the eccentric insert 12, the position of the passage bore for the screw can thus be changed and adapted to a threaded bore in the propeller hub.

Schweinfurt, 04.11.2015

201400462

LIST OF REFERENCE NUMBERS

1 stern tube seal

2 stern tube

3 propeller hub

4 protective jacket

5 annular gap

6 ring

6 'ring sector

6 "ring sector

6 "'ring sector

6 "" ring sector

7 centering element

8 screw connection

9 insert part

10 hole

11 slot

12 eccentric insert

13 sealing lip

14 socket

15 propeller shaft

16 flange

17 gap

18 mounting hole

B material (mineral casting / polymer concrete)

a axial direction

Claims

PENTENTIAL PROTECTION FOR THE STEVENROHRAB SEALING OF PROPELLER-DRIVEN VESSELS

1. Protection device for the stern tube seal (1) of propeller-driven ships, in which between the sterntube (2) and the propeller hub (3) a gap is recessed, which is covered by a tubular, concentric with the propeller hub protective jacket (4), on the one hand on the stern tube (2) is firmly anchored and on the other hand, the propeller hub (3), leaving an annular gap (5) engages, wherein in the space between sterntube (2) and propeller hub (3) within the protective jacket (4) with the propeller hub ( 3) concentric and in a radial section U-shaped ring (6) is arranged, whose U-opening is directed radially outward, characterized in that the ring (6) consists at least partially of a material (B), which at room temperature ( T = 20 ° C) may have a pourable consistency.

2. Protection device according to claim 1, characterized in that the material (B) concrete, in particular mineral casting, is.

3. Protection device according to claim 1 or 2, characterized in that the ring (6) consists of at least two ring sectors (6 ', 6 ", 6'", 6 ""), wherein each ring sector (6 ', 6 ", 6 '", 6"") extends over a defined circumferential angle and wherein the ring sectors (6 ', 6 ", 6"', 6 "") are preferably connected to each other.

4. Protection device according to claim 3, characterized in that two, three, four, five or six ring sectors (6 ', 6 ", 6'", 6 "") form the ring (6).

5. Protection device according to claim 3 or 4, characterized in that the ring sectors (6 ', 6 ", 6'", 6 "") are aligned relative to each other with centering elements (7), wherein the centering elements (7) preferably from a complementary Profiling the circumferentially located end portions of the ring sectors (6 ', 6 ", 6"', 6 "") are formed.

6. Protection device according to one of claims 1 to 5, characterized in that the ring (6) or the ring sectors (6 ', 6 ", 6'", 6 "") by means of a screw connection (8) on the propeller hub (3 ) or is attached to the protective jacket (4) or are.

7. Protection device according to claim 6, characterized in that in the ring (6) or in the ring sectors (6 ', 6 ", 6"', 6 "") insert parts (9) are arranged, of at least one screw (8 ).

8. Protection device according to claim 7, characterized in that the insert parts (9) from the material (B) of the ring (6) are at least partially surrounded.

9. Protection device according to one of claims 1 to 8, characterized in that the material (B) consists of fillers and binders and optionally of additives, wherein the filler preferably has a weight fraction between 80% and 95%, wherein the binder is preferably a weight fraction between 5% and 20% and wherein the binder is preferably made of a resin, in particular of epoxy resin, and a hardener, in particular of an amine hardener.

Protection device according to one of claims 1 to 9, characterized in that the material (B) reinforcing fibers are added, in particular glass fibers, carbon fibers or metallic fibers.