RU2760247C1 - Water jet thrusting apparatus - Google Patents

Abstract

FIELD: shipbuilding.SUBSTANCE: invention relates to the field of shipbuilding and can be used in apparatuses providing maneuvering and positioning of ships. The water jet thrusting apparatus includes a flow channel body, a pump containing a shaft and a hub with impeller vanes secured thereon and connected with the channel body by means of power elements. A drive electric engine with a stator and a rotor is placed in the wall of the flow channel, the pump blades are secured on the annular rotor of the electric engine. The hub of the pump is made of two coupled parts with a shaft installed therein. The part of the hub with the blades secured thereon is made movable, and the second part with the power elements is made immovable. The power elements are made in the form of a structure serving as a straightener.EFFECT: dimensions of the thrusting apparatus are reduced and efficiency and reliability thereof are increased.2 cl, 1 dwg

Description

The invention relates to the field of shipbuilding and can be used to create propulsion devices for steering, positioning and maneuvering ships.

Known tunnel thrusters (TPU) of a floating vehicle, containing in the transverse tunnel of the body of this means a propeller, including a nacelle and a propeller shaft with a propeller, a drive engine located in the ship's hull and kinematically connected to the propeller by means of an intermediate shaft and a gear train (see ., for example, RF patent No. 2041134, IPC B63N 25/46, 1995). The disadvantage of such thrusters is the low stop values in the mooring mode and increased vibrations during the operation of the TPU.

There are no shortcomings of TPU, developed and currently produced by a number of domestic and foreign companies, water jet thrusters (VPU). In these devices, the pump is located in a vertical or horizontal channel and draws in water from under the bottom of the vessel, and then directs it towards one or the other side. This design of the bow thruster has a number of advantages over TPU, namely:

- improving the maneuverability of ships;

- higher efficiency on waves;

- reduction of the additive to the towing resistance of the vessel;

- the possibility of using on shallow-draft vessels;

- the possibility of expanding functions and scope;

- reduced levels of vibration and noise.

The operation of the VPU pump in the pulling mode, the most rational from the point of view of flow uniformity, allows satisfying the above-mentioned requirements for the control unit in terms of vibrations and noise at approximately equal efficiency. This VPU is the closest analogue to the claimed invention in terms of technical essence and the achieved result. The VPU includes a flow channel housing, a pump containing a shaft and a hub with impeller blades fixed on it and connected to the channel housing by power elements, as well as a drive electric motor having a stator and a rotor and connected to the pump by a drive shaft (see, for example, RF patent No. 2248915, IPC V63N 25/46, 2005). This VPU also has its drawbacks due to the need to introduce a drive shaft into the structure, the length of which reaches several meters. The presence of the drive shaft causes an increase in the hydrodynamic resistance, and also leads to an increase in the dimensions of the TLU.

The aim of the present invention is to reduce the size of the jet thruster, as well as to increase its efficiency and reliability.

This goal is achieved by the fact that in the known invention, including the housing of the flow channel, a pump containing a shaft and a hub with impeller blades fixed on it and connected to the channel housing by power elements, as well as a drive motor having a stator and a rotor, in it a drive motor is placed in the wall of the flow channel, the pump blades are fixed on the annular rotor of the electric motor, and the propeller hub is made of two docked parts with a shaft installed inside them, while part of the hub with the blades fixed on it is movable, and the second part with power elements - motionless. In this case, the power elements are made in the form of a structure that plays the role of a straightening apparatus.

The proposed design of the WPU has the following advantages in comparison with the known WPU having a drive on the shaft:

- the absence of a shaft causes a decrease in the hydraulic resistance of the VPU path, which leads to a decrease in the requirements for the pump head and a decrease in power consumption;

- the absence of a shaft allows organizing a flow reorientation device with a minimum hydraulic resistance;

- the absence of a gear increases the reliability of the device;

- in the case of using an electric motor located in the wall of the flow channel at the inlet section of the water flow path, a space above the TLU is freed up in the engine room of the floating vehicle.

The proposed design of the jet thruster is shown in the figure with the following designations:

1 - water intake;

2 - flow channel;

3 - flow channel body;

4 - output channels;

5 - the bottom of the floating means;

6 - dampers;

7 - fixed part of the hub;

8 - the movable part of the hub;

9 - pump impeller blades;

10 - shaft;

11 - stator of the electric motor;

12 - the rotor of the electric motor;

13 - power elements.

The water jet thruster (see Fig.) Consists of a water intake 1 installed in the bottom 5 of the boat, a vertical flow channel 2 and outlet channels 4 through which water is thrown out to the sides of one or the other side by opening and closing the dampers 6. In the flow channel 2, a pump with blades 9 is installed. These blades, on the one hand, are fixed on the movable part of the hub 8, and on the other hand, with the rotor of the electric motor 12, which, like the stator 11, is located in the housing of the flow channel 3. Inside the hub there is a shaft 10, which provides rotation of the movable part of the hub 8 and combining the movable 8 and the stationary part 7 of the hub. The latter is fixed to the body of the flow channel 3 by means of force elements 13, which have a structure that acts as a straightening device.

The proposed WPU works as follows. When the electric motor is turned on, the rotor 12 starts to rotate, providing rotation of the pump blades 9. The water medium is drawn through the water intake 1 into the flow channel 2 and then enters one of the outlet channels 4. The water flow flows out of the nozzle of the channel 4, creating a certain force for maneuvering the floating vehicle. The direction of the water flow is ensured by opening and closing the dampers 6.

The location of the drive motor in the wall of the flow channel makes it possible to significantly increase the efficiency of the WPU by reducing the hydraulic resistance, which is ensured by removing from the structure a long drive shaft connecting the electric motor and the pump, as well as making the power elements in the form of a straightening device. The proposed WPU has a simpler design, since the reducer is excluded from the WPU. And this, in turn, leads to an increase in the reliability of the device.

Claims (2)

1. A water jet thruster, which includes a flow channel housing, a pump containing a shaft and a hub with impeller blades fixed on it and connected to the channel housing by power elements, as well as a drive motor having a stator and a rotor, characterized in that the drive motor is located in the wall of the flow channel, the pump blades are fixed on the annular rotor of the electric motor, and the pump hub is made of two docked parts with a shaft installed inside them, while the part of the hub with the blades fixed on it is movable, and the second part with the power elements is fixed. 2. The jet thruster according to claim 1, characterized in that the power elements are made in the form of a structure that plays the role of a straightening apparatus.

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