Combined pump-jet propeller

Abstract

The invention relates to a propeller, specifically to a combined pump-jet propeller. The combined pump-jet propeller is characterized by comprising an external guide pipe; the external guide pipe is of a contracted shape; two ends of the external guide pipe is respectively a water inlet and a water outlet; a pump-jet propeller and a water jet pump are arranged within the combined pump-jet propeller; the pump-jet propeller comprises a pump-jet rotor, a pump-jet stator and a pump-jet motor; the pump-jet motor is fixed within the external guide pipe through four fixed rotors; the rear part of thepump-jet motor is connected with the pump-jet rotor; the pump-jet stator is arranged behind the pump-jet rotor to be used for rectification; the pump-jet stator is connected with the external guide pipe; a pump-jet impeller motor is arranged at the center of the pump-jet stator; and the pump-jet impeller motor is connected with the water jet pump. The combined pump-jet propeller has the advantages that defects of the pump-jet propeller and the water jet pump complement each other on the premise that the advantages of both the pump-jet propeller and the water jet pump are kept; the combined propeller has the advantages of low radiation noise, less thrust loss, higher propelling efficiency and high critical speed; and the combined pump-jet propeller is suitable for submarines and vessels.

Description

technical field [0001] The invention relates to a propeller, in particular to a combined pump-jet propeller. Background technique [0002] At present, water ships and submarines mainly use propellers as mechanical propulsion devices. The propellers are used to convert the rotational power of the engine into propulsion by the rotation of the blades. The disadvantages are low propulsion efficiency and high noise. Although the performance of the water-jet propulsion pump is better than that of the propeller, the rotor of the pump-jet propeller will accelerate the water flow and pass it to the stator for rectification. After the water flow passes through the end of the transmission mechanism, the high-speed edge flow layer on the outside of the flow field will move closer to the center. A low-speed zone (low-pressure zone) is formed at the end of the transmission mechanism. No matter how high the velocity of the fluid is, this low-pressure area will exist. After a certain dista...

AI Technical Summary

Problems solved by technology

[0002] At present, water ships and submarines mainly use propellers as mechanical propulsion devices. The propellers are used to convert the rotational power of the engine into propulsion by the rotation of the blades. The disadvantages are low propulsion efficiency and high noise. Although the performance of the water-jet propulsion pump is better than that of the propeller, the rotor of the pump-jet propeller will accelerate the water flow and pass it to the stator for rectification. After the water flow passes through the end of the transmission mechanism, the high-speed edge flow layer on the outside of the flow field will move closer to the center. A low speed zone (low pressure zone) is formed at the end of the transmission mechanism

No matter how high the velocity of the fluid is, this low-pressure area will exist. After a certain distance, the outer high-speed edge flow layer will move closer to this area. After moving closer, friction (wake vortex) will occur between the fluids, resulting in energy loss. Reduce the propulsion efficiency of the pump-jet propeller; the water-jet propulsion pump requires sufficient and relatively stable inflow

Also the water jet propulsion pump is less efficient at low speeds (less than 20 knots)

Images