RU133807U1 - PULSIVE SYSTEM WITH SUBMERSIBLE ELECTRIC MOTOR - Google Patents

Abstract

1. The propulsive system, which includes a submersible electric motor, the rotor of which is structurally combined with the propeller, and the shaft pins of the propeller shaft are installed in the bearings of the bearings, characterized in that the bearings of the bearings are provided with sleeves, on the working surface of which a wear-resistant coating is applied, and the propeller shaft trunnions are equipped with bushings of antifriction material, on the outer surfaces of which longitudinal lubrication grooves are made, open from the ends of the bushings. 2. The system according to claim 1, characterized in that a ceramic layer is used as a wear-resistant coating of the liners. The system according to claim 1, characterized in that the lubricating grooves are made in a helical form. The system according to claim 3, characterized in that the lubricating grooves are made with a constant step. The system according to claim 3, characterized in that the lubricating grooves are made with a variable pitch.

Description

The utility model relates to shipbuilding, namely to propulsion systems with a submersible electric motor.

Terms used in the application.

The sleeve is a cylindrical part, in the hole of which the mating part enters. (New Polytechnical Dictionary. Ed. A.Yu. Ishlinsky. M: Big Russian Encyclopedia Scientific Publishing House, 2000, p. 87)

A trunnion is a part of a shaft resting on a bearing (ibid., P. 601).

The term "sleeve" in the application refers to a cylindrical insert.

From patent RU 2323123 C2, IPC B63H 1/16, B63H 5/14, publ. 04/27/2008, the known design of the propulsion system, which includes a housing, a submersible electric motor and a propeller. The stator of the electric motor is attached to the housing, and the rotor on the inside has as a single whole circular ring. The rotor shaft is installed in the bearings of the bearings and is simultaneously the shaft of the propeller.

From patent US 8229669 B2, IPC Н02К 5/10, publ. 10.30.2012, also known is the design of the propulsion system containing a submersible electric motor, the rotor of which is structurally combined with the propeller, and the propeller shaft is installed in the bearings.

The prior art use in propulsion systems with a submersible electric motor sliding bearings with lubrication and cooling with outboard water.

In the prior art, for example, the design of a ship propeller shaft bearing is known, see the description of Patent RU 2385256 C1, IPC B63H 23/34, 23/26, publ. 03/27/2010, which includes the bearing of the sliding bearing and antifriction liners fixed in grooves made on the inner surface of the bearing of the sliding bearing. To remove the abrasive from the friction zone, longitudinal grooves are made on the surface of the antifriction liners.

As is known from the description of patent RU 2382717 C1, IPC B63H 23/36, F16C 17/14, publ. 02/27/2010, the implementation of the grooves on the inner surface of the support of the marine sliding bearing is a very laborious process.

During the operation of sliding bearings, the lower loaded part of the bearing support supporting the shaft is more intensely erased, which predetermines a short service life of the system. When the lower loaded part of the bearing support is abraded, the rotor of the submersible motor shifts downward, disrupting the normal functioning of the electric motor (in particular, the flux linkage of the stator windings with the permanent rotor magnets changes).

The prototype of the claimed utility model is the design of a propulsion system with a submersible electric motor, known from patent US 6837757 B2, IPC V63H 23/24, publ. January 4, 2005, which includes a submersible electric motor, the rotor of which is structurally combined with the propeller, and the propeller shaft is installed in the bearings of the plain bearings. In the prototype, to increase the service life, the bearing support systems are made of a material with increased hardness.

The disadvantages of the prototype system are the insufficient service life, due to the lack of means for efficient lubrication and cooling of bearings, and increased requirements for the material of bearing bearings.

The technical result of the claimed utility model is the creation of a propulsion system with a submersible electric motor, characterized by high manufacturability, increased reliability and an increased service life.

The specified technical result is achieved in the design of the propulsive system, in which a submersible electric motor, the rotor of which is structurally combined with the propeller, and the propeller shaft is installed in the bearings of the sliding bearings.

The technical result is achieved by the fact that the bearings of the sliding bearings are equipped with sleeves, on the working surface of which a wear-resistant coating is applied, and the trunnion trunnions are equipped with antifriction material bushings, on the outer working surfaces of which are longitudinal lubricating grooves open from the ends.

In an embodiment, a ceramic layer can be used as a wear-resistant coating on the working surfaces of the sleeve casings, and the lubricating grooves can be made in a helical form, with a constant or variable pitch.

The utility model is illustrated by illustrations:

Figure 1 shows a propulsion system with a submersible electric motor;

Figure 2 shows a part of the propulsion system, including the pin of the propeller shaft with a sleeve pressed onto it and a support with a sleeve.

The positions in the figures indicated:

1 - mounting device;

2 - reference module;

3 - stator of a submersible electric motor;

4 - rotor of a submersible electric motor;

5 - propeller;

6 - propeller shaft;

7 - bearing bearing sliding shaft of the propeller;

8 - cable entry;

9 - sleeve with wear-resistant coating;

10 - sleeve trunnion shaft propeller;

11 - grooves on the hub of the pin of the propeller shaft.

The design described below explains the essence of the claimed technical solution, but does not exhaust the options for its implementation.

The utility model can be implemented in the design of the propulsion system (see Fig. 1, 2), which includes at least a submersible electric motor with a stator 3 and rotor 4. The rotor 4 is structurally combined with the propeller 5, and the shaft 6 of the propeller screw 5 is installed in the bearings 7 of the plain bearings.

The submersible electric motor of the propulsion system is connected to the hull of the vessel by means of a fastening device 1 and a support module 2, each of which is a welded assembly. The supply voltage to the stator windings of a submersible electric motor is performed through a cable entry 8.

To implement the utility model, the following structural changes are performed (see Figure 2).

The bearings 7 of the sliding bearings are provided with sleeves 9, on the working surface of which a wear-resistant coating is applied.

In a preferred embodiment of the utility model, a titanium alloy or corrosion-resistant steel is used as the material for the manufacture of sleeves, and the wear-resistant coating is performed by detonation spraying of an Al ₂ O ₃ layer.

The trunnion shaft trunnions are provided with bushings 10 of antifriction material, on the outer working surfaces of which longitudinal lubricating grooves 11 are made, open from the ends of the bushings.

Lubricating grooves 11 perform several functions. Along the grooves 11, the outboard water, used as a lubricant and for cooling friction surfaces, enters the sliding bearings of the propeller shaft. Through the grooves 11, the abrasive is also removed from the friction zone.

Lubricating grooves 11 can be made straight or screw.

The helical grooves, in turn, can be made with a constant or variable pitch.

In the case of grooves with a variable pitch, the groove pitch is performed in such a way as to increase the flow rate of sea water at the outlet of the bearing. When the propeller shaft rotates with the sleeve pressed onto the shaft journal, the lubricating grooves 11, made with a variable pitch, create a pumping effect that increases the flow rate of water through the bearing, and thereby contribute to the intensive washing out of abrasive particles from the working area of the bearing. Due to this, the clearance in the plain bearing can be significantly reduced.

Cutting the lubrication grooves 11 on the outer surface of the propeller shaft journal sleeve is much more technologically advanced than cutting the lubrication grooves on the inner surface of the sleeve of the plain bearing.

The system operates as follows. When the supply voltage is supplied through the cable entry 8 to the stator windings 3 of the submersible electric motor of the propulsion system, an electric current flows through the windings, which creates a magnetic field that causes the rotor 4 to rotate, connected to the propeller 5. The propeller blades 5, the shaft 6 of which rotates in bearings 7 plain bearings, capture a mass of water and throw it back. The reaction force of the discarded water makes the ship move.

Water through the lubricating grooves 11 open from the ends is supplied to the sliding bearings of the shaft 6 of the propeller, providing lubrication and cooling of the friction working surfaces of the liners and bushings, as well as the removal of abrasive particles from the working zone.

Prototypes of the developed propulsive system were tested as part of the vessel and showed increased reliability in operation and durability. In particular, the service life of the propeller shaft bearings while maintaining the allowable clearance exceeded 10,000 hours.

Claims (5)

1. The propulsive system, which includes a submersible electric motor, the rotor of which is structurally combined with the propeller, and the shaft pins of the propeller shaft are installed in the bearings of the bearings, characterized in that the bearings of the bearings are provided with sleeves, on the working surface of which a wear-resistant coating is applied, and the trunnion shaft trunnions are provided with bushings of antifriction material, on the outer surfaces of which longitudinal lubrication grooves are made, open from the ends of the bushings. 2. The system according to claim 1, characterized in that a ceramic layer is used as a wear-resistant coating of the liners. 3. The system according to claim 1, characterized in that the lubricating grooves are made in helical form. 4. The system according to claim 3, characterized in that the lubricating grooves are made with a constant pitch. 5. The system according to claim 3, characterized in that the lubricating grooves are made with a variable pitch.

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