Ice breaker aft

FIELD: transport.

SUBSTANCE: ice breaker aft comprises ice breaking ledge rigidly secured at stem-post in the ship centre line and arranged behind rudder blade along ship motion. Top end of rudder blade turn axle extends thorough stem-post while bottom end is secured at the heel rigidly secured with keel. Said rudder blade turn axle is arranged on the side of ice breaking ledge side, said ledge being rigidly coupled by vertical prop with appropriate end of said heel to make a vertical protective frame around rudder propeller unit. Vertical prop rear edge is sharpened. Ice baffle plates are rigidly secured on both sides of stem-post at acute angle to horizontal plane at ship hull underwater surface, free ends of said plates are lowered under secured edges by at least to the level above below screw top edge. Distance from rudder blade turn axle to its rear edge does not exceed the radius of curvature described by said edge.

EFFECT: better controllability in reverse motion, higher reliability of rudder propeller protection.

3 cl, 3 dwg

 

The invention relates to shipbuilding, in particular to the structure of the aft ends of the ice ship.

Known design of the ship ice navigation, in which stern extremity contains legresy ledge, rigidly attached to aftershave in a diametral plane of the vessel, and located behind the rudder in the direction of motion of the ship, and the rudder attached to aftershave rotatably in a vertical plane (see RF patent 2286908, IPC WV 25/12, WV 35/08, WV 3/20, WV 3/60, 2006).

As the closest analogue adopted the aft end of the ship ice navigation containing legresy ledge, rigidly attached to aftershave in a diametral plane of the vessel and located behind the rudder in the direction of motion of the vessel, with the upper end of the axis of rotation of the rudder blade is passed through aftershaving, and the bottom is placed on the heel, rigidly attached to the keel (see and.with. The USSR №831658, IPC WV 3/40, 1981).

The drawbacks are the low controllability of the vessel and the insufficient protection of the propulsion system.

The problem to be solved by the present invention is the design of the aft ship ice navigation, providing reliable protection of the propulsion system of a vessel.

The technical result, the achievement�recover when solving the tasks, is expressed in improving the manageability of the vessel when it is reversing and increasing the reliability of protection of propeller-rudder system, especially when relaying rudder on any of the sides of the vessel.

The problem is solved in that in the aft of the ship ice navigation containing legresy ledge, rigidly attached to aftershave in a diametral plane of the vessel and located behind the rudder in the direction of motion of the vessel, with the upper end of the axis of rotation of the rudder blade is passed through aftershaving, and the bottom is placed on the heel, rigidly attached to the keel axis of rotation of the rudder blade posted by liderazgo of the ledge, which is rigidly connected a vertical column with the corresponding end of the heel, forming a vertical protective frame around the propulsion system, and the rear facing edge of the vessel upright pointed, and on both sides of aftershave, at an acute angle to a horizontal plane, on the underwater surface of the hull is rigidly mounted chippers ice-free edges are lowered below the fixed edges at least at a level below the upper edge of the screw, in addition, the distance from the axis of rotation of the rudder blade up to his rear in the travel direction of the vessel edges is not greater than the radius of curvature described by this edge.

In addition, ice chippers same�TKO connected with a horizontal thrust, missed in the gap between the screw and rudder blade. In addition, chippers ice is made in the form of the pointed triangles, acute vertex of which is oriented in the direction of motion of the vessel.

Comparative analysis of the essential features of the proposed technical solutions and the essential features of the prototype and analogues demonstrates its compliance with the criterion of "novelty."

At the same features of the claims solve the following functional tasks.

The sign of "the axis of rotation of the rudder blade posted by liderazgo of the ledge, which is rigidly connected a vertical column with the corresponding end of the heel, forming a vertical protective frame around the propulsion system provides protection for the propeller-rudder system in the vertical plane along the entire height of the rudder blade when the vessel is in reverse as in the forward position of the rudder, and when it is relaying on any of the sides of the vessel.

The symptom of "rear facing edge of the vessel upright pointed" provides the possibility of splitting the ice during their contact with vertical stand or offset to the side of the vessel when it is reversing.

Signs "on both sides of aftershave, at an acute angle to a horizontal plane, on the underwater surface of the hull rigidly fix�; ice chippers, available edges are lowered below the fixed edges, at least on the level below the upper edge of the screw" and "chippers ice is made in the form of the pointed triangles, acute vertex of which is oriented in the direction of motion of the vessel" protect the propulsion system when driving the vessel forward course, with the ice chippers are arranged in such a way as to prevent contact of ice with the propeller-rudder complex, regardless of the rudder angle of the rudder blade.

The sign of "the distance from the axis of rotation of the rudder blade up to his rear in the travel direction of the vessel edges is not greater than the radius of curvature described this edge provides improved controllability of the vessel when it is reversing. When shifting the rudder and vertical strut to form the profile of the concave-convex shape, which significantly increases created by the rudder blade side force. Also, when relaying rudder reduced the likelihood of jamming of the ice in the space between a vertical column and rudder blade, because its rear edge in terms not substantially beyond the lateral surface of the vertical uprights.p>

The symptom of "ice chippers are rigidly interconnected by a horizontal rod passed into the gap between the screw and rudder blade" enhances the strength of the bump of ice under the action of lateral ice �of agrusti and improvement of spatial stiffness of the vessel.

Fig. 1 shows a side view of the stern of ice navigation.

Fig. 2 shows a rear view of the aft of the ship ice navigation.

Fig. 3 shows a diagram of the device in the vessel ahead or astern.

The drawings show legresy the ledge 1, aftershaving 2 ship, the rudder 3, the axis of rotation 4 of the rudder 3, the heel is 5, the vertical strut 6, the rear facing edge of the vessel 7 the upright 6, the screw 8, the housing 9 of the vessel, chippers ice 10, the horizontal rod 11.

Legresy ledge 1 rigidly secured to aftershave 2 in a diametral plane of the vessel and located behind the rudder blade 3 in the direction of motion of the vessel.

Legresy ledge 1 is rigidly connected vertical stand 6 with the free end of the heel 5, forming a vertical protective frame around the propulsion system, comprising a rudder blade 3 and the screw 8. The rear facing edge of the vessel 7 the upright 6 pointed.

The axis of rotation 4 of the rudder blade 3 posted by liderazgo ledge 1, and its upper end is passed through aftershaving 2, and the lower end is placed on the heel 5, rigidly attached to the keel of the vessel (not shown).

The distance from the axis of rotation 4 of the rudder blade 3 to the rear in the travel direction of the vessel edges is not greater than the radius of curvature described by this edge.

Chippers ice 10 ill�to fixed on the underwater surface of the hull 9 on both sides of aftershave 2, at an acute angle to the horizontal plane, with their free edges bent below the pinned edges at least at a level below the upper edge of the screw 8. The ice chippers 10 made in the form of the pointed triangles, acute vertex of which is oriented in the direction of motion of the vessel and rigidly connected with a horizontal rod 11 is passed into the gap between the screw 8 and the rudder blade 3.

The inventive device operates as follows.

When the vessel is moving forward course along the body 9 of the vessel ice floes, going to feed the valance (the drawings are not specified), come into contact with the ice chippers 10 and move them along towards the rear end. Chippers ice 10 are arranged in such a way as to prevent contact of ice with the screw 8 and the rudder blade 3 regardless of the angle of the rudder.

When the vessel is in reverse ice come into contact with the vertical stand 6 protecting the rudder blade 3 along its entire height.

In the case where the rudder 3 is located in a diametral plane of the vessel, the rear facing edge of the vessel 7 the upright 6 in contact with the ice splits it into two parts, the rudder 3 and a vertical stand 6 form a single streamlined profile.

When shifting the rudder blade 3 on any of the boards as a result of contact the ice and back along the d�izheniya vessel edges 7 of the upright 6 is offset from the ice to the side of one of the sides, the rudder blade 3 and a vertical stand 6 to form the profile of the concave-convex shape. Moreover, the trailing edge of the rudder blade 3 in terms of not substantially beyond the lateral surface of the upright support 6, which reduces the likelihood of jamming of the ice in the space between vertical stand 6 and the rudder blade 3.

Thus, the proposed technical solution provides high controllability of the vessel and protection of the propulsion system of the ship ice navigation when driving in ice.

1. The aft end of the ship ice navigation containing legresy ledge, rigidly attached to aftershave in a diametral plane of the vessel and located behind the rudder in the direction of motion of the vessel, with the upper end of the axis of rotation of the rudder blade is passed through aftershaving, and the bottom is placed on the heel, rigidly attached to the keel axis of rotation of the rudder blade posted by liderazgo of the ledge, which is rigidly connected a vertical column with the corresponding end of the heel, forming a vertical protective frame around the propulsion system, and the rear facing edge of the vessel upright pointed, and on both sides of aftershave at an acute angle to the horizontal plane on the underwater surface of the hull is rigidly mounted chippers ice-free edges of which are omitted lower� pinned edges, at least on the level below the upper edge of the screw, in addition, the distance from the axis of rotation of the rudder blade up to his rear in the travel direction of the vessel edges is not greater than the radius of curvature described by this edge.

2. The aft end of the ship ice navigation according to claim 1, in which the ice chippers are rigidly interconnected by a horizontal rod passed into the gap between the screw and rudder blade.

3. The aft end of the ship ice navigation according to claim 1, in which the bump stops ice is made in the form of the pointed triangles, acute vertex of which is oriented in the direction of motion of the vessel.



 

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