RU2320516C1 - Propulsive system with submersible electric motor - Google Patents

Abstract

FIELD: shipbuilding; propulsive systems.

SUBSTANCE: proposed propulsive system equipped with submersible electric motor has autonomous body and reversible submersible electric motor whose stator is secured to body and rotor is provided with circular ring on its inner side. Stator coils are located in circular position in parallel with motor central axis. Rotors with circular rings are coaxially mounted on both butts of stator, propeller blades being secured to its inner surface. Inner diameter of circular ring is equal to inner diameter of stator. Both rotors have common shaft which is simultaneously used as propeller shaft. Shaft is secured to pillars attached to load-bearing structures of body and/or stator. Propeller hubs are provided with shaft bearings.

EFFECT: improved propulsive characteristics of ship; reduction of acoustic noise.

7 cl, 3 dwg

Description

The invention relates to shipbuilding, and in particular to propulsion (propeller-driven) systems for surface ships and vessels of various displacement, and can also be used on underwater vehicles and other boats. With a corresponding change in the shape of the body, the system can be used in pipeline transport for pumping liquid media.

Known propulsive systems of the company AQUAMASTER [1], comprising a housing and a screw in the nozzle, as well as mechanical transmission of power from the engine to the shaft of the propeller. Known propulsion systems of the same company with coaxial screws. The disadvantages of such systems - mechanical power transfer has significant weight and size characteristics, the use of a gearbox reduces the efficiency of the system, the body of the system creates a relatively large hydrodynamic resistance, which also reduces the efficiency of the system, in addition, the systems have a rather complicated design.

Known propulsion systems of the company SHOTTEL GmbH with a submersible motor [2], comprising a housing, an electric motor in the housing, on the shaft of which a propeller is mounted. Disadvantages - the relatively small efficiency of the screw operating in confined spaces, as well as the significant hydrodynamic resistance of the system housing, which reduces its efficiency.

Known water-jet propulsion-motor complex [3], containing an autonomous housing with a submersible electric motor, the stator of which is attached to the housing, and the rotor from the inside has as a single whole circular ring. Adopted for the prototype.

The disadvantages of the prototype are the lack of stable rotation of the rotor, the possibility of increased vibration and noise from support-stop devices, their relatively low maintainability and the relative complexity of the design of the complex.

The technical result of the invention is the provision of stable rotation of the rotor, simplifying the design of the complex, reducing vibration and noise, improving maintainability, increasing efficiency.

The technical result is achieved by the fact that the propulsion system with a submersible electric motor contains an autonomous housing in the form of a guide nozzle and a reversible electric immersion motor, the stator of which is attached to the housing, and the rotor on the inside has as a single whole circular ring. The stator coils are arranged in a circle parallel to the central axis of the motor, and rotors with a circular ring are placed coaxially on both ends of the stator, the propeller blades are fixed to its inner surface. The inner diameter of the circular ring is equal to the inner diameter of the stator. Both rotors have a single shaft, which at the same time is a shaft of propellers, and the shaft is attached to racks fixed to the supporting structures of the system housing and / or stator, and the hubs of the propellers are provided with shaft bearings.

The racks are made hollow of composite materials differing in the maximum values of internal losses, can be filled with vibration-absorbing materials, expanding the frequency range of effective sound and vibration absorption, and can have acoustic vibrations along the length. At the same time, the racks have an optimal hydrodynamic profile that provides minimal resistance. The feathers of the steering gear are attached to the stern posts or to the stern of the system housing.

A propulsive system with a submersible electric motor is shown in Fig. 1 (vertical longitudinal section), Fig. 2 (front view) and Fig. 3 (placement of racks).

The system includes a housing (nozzle) 1, the supporting structure of the mover 2, the current lead of the stator coil of the electric motor 3, the stator coil 4, the outer cage of the stator 5, the internal collapsible cage of the stator 6, the rotor casing of the electric motor 7, a highly coercive magnet 8, the rotor magnetic circuit 9, the circular ring 10 , propeller 11, shaft 12 and hub of screw 13, bow stance (bow stance) 14, bow stub bearing 15, stern stance (stern stance) 16, stern shaft bearing 17, steering wheel feather 18.

The device operates as follows. When power is supplied through the current lead 3 to the stator coils of the electric motor 4, the rotors 7 rotate with the ring 10 and, therefore, the propellers 11 come into rotation. The water flow drawn in by the propellers flows onto the blades of the propellers 11, a traction force is generated. The blades throw water to the periphery to the inner surface of the ring. In this case, a vacuum is formed in the center of the ring, which leads to an increase in the volume of water passing through the screw by 30-40%. Due to this effect, the diameter of the propellers can be reduced without deteriorating their efficiency, the speed of rotation is reduced, and, as a result, the noise is reduced. The stern propeller may rotate in the same direction with the bow or in the opposite direction. It depends on the distance between the propellers. With a small distance, the stern propeller can serve as a flow straightener from the bow propeller, for which it will rotate in the opposite direction. The permanent magnets of the stern rotor will have the same poles to the stator coils with the bow rotor.

To turn the ship on one or another side, if it is impossible to rotate the rod 19, turn the pen (s) 18 of the steering device.

The proposed propulsive system in comparison with existing has a relatively low weight and dimensions. It can be placed in any part of the ship’s hull, at any reasonable distance from the hull (on the hydrofoil, on the rudders or instead of them, in hinged and rotary columns, between the hulls of multihull vessels, etc.), regardless of the location of the electric current source. The system does not have a propeller shaft passing through the hull. The system does not require cooling. It is possible to achieve low levels of vibration and noise in the premises of the vessel, as well as in the surrounding body of water. The system has good maintainability, easy to maintain. The range of system capacities in this design is practically unlimited [4].

The application of the proposed propulsion system in comparison with systems with mechanical transmission to the screw (for example, [1]) will approximately reduce the weight of the equipment and the volume occupied by electric propulsion within 20-40%, increase the propulsive characteristics of the ship by at least 15-20% [ 5], to reduce by 2-3 times or more the level of noise and vibration in the premises of the ship and in the surrounding aquatic environment.

Compared with existing propulsion systems with a submersible electric motor (for example, [2]), one should expect a decrease in the mass and dimensions of the system, an increase in the propulsive characteristics of the ship by at least 10-15%, and also a further reduction in vibration and acoustic noise.

The use of an autonomous housing in the form of a guide nozzle will increase thrust 1.3-2 times, significantly increase the efficiency of the system.

A part of the system (except its hull), enclosed in the supporting structure of the propulsion unit 2, can be used for embedding in the circular tunnel of the hull of the vessel, for example, in a thruster, in the waterway of the water jet propulsion device, in the pipeline for transporting fluid (gas, liquid).

Information sources

1. Excellence in Propulsion "News from the KaMeWa Group", Number 1, July 1997.

2. WW.Schottel.de.

3. RF patent No. 2204502, publ. 2003.

4. "Demonstration and spin-off of the Integral Motor / Propeller Propulsion System", Proceedings, 1994, Technical Innovation Symposium, 7-9 September 1994, pp. 109-124.

5. Vekslyar V.Ya. Search for ways to improve the design of propulsion systems and propulsion systems of warships and ships. 3rd international conference and exhibition on marine intellectual technologies, "Morintex - 1999", September 14-16, 1999, St. Petersburg.

Claims (7)

1. A propulsive system with a submersible electric motor, comprising an autonomous housing and a reversible submersible electric motor, the stator of which is attached to the housing, and the rotor on the inside has as a single whole circular ring, characterized in that the stator coils are arranged in a circle parallel to the central axis of the motor, on both rotors with a circular ring, the propeller blades are fixed to the inner surface of which the rotor blades are coaxially located at the ends of the stator, while the inner diameter of the circular ring is equal to the inner diameter of tator, both rotors have a single shaft, which is simultaneously a shaft of propellers, and the shaft is attached to racks fixed to the supporting structures of the housing and / or stator, and the hubs of the propellers are provided with shaft bearings. 2. The propulsive system according to claim 1, characterized in that the autonomous housing is made in the form of a guide nozzle. 3. The propulsive system according to claim 1, characterized in that the racks are made hollow and filled with vibration-absorbing materials. 4. The propulsive system according to claim 1 or 2, characterized in that the racks are made of composite materials with maximum values of the coefficient of internal losses and have vibroacoustic decoupling along the length of the racks. 5. The propulsive system according to any one of claims 1 to 3, characterized in that the struts have an optimal hydrodynamic profile that provides minimal hydrodynamic resistance. 6. The propulsion system according to claim 1, characterized in that the feathers of the steering device are attached to the aft racks. 7. The propulsive system according to claim 1, characterized in that the feathers of the steering device are fixed to the aft of the hull for the screw.

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