High-efficiency axial flow and screw combined pump for ship

Abstract

The invention relates to a structure of a high-efficiency axial flow and screw combined pump. A large flow and a high pressure are obtained by high speed rotation. A transmission chain in a ship is greatly simplified. The high-efficiency axial flow and screw combined pump has light weight and is suitable for high-speed sailing. The high-efficiency axial flow and screw combined pump is characterized in that an axial flow pump impeller and a screw of a screw pump which are driven coaxially are arranged in a big sleeve to form a structure of an axial flow pump and the screw pump; if the positions of the axial flow pump and the screw pump are exchanged, a structure of the screw pump and the multi-stage axial pump is formed; and water is sucked from the front of the ship bottom, obtains kinetic energy through the front-mounted pump and then is fed to the rear-mounted pump to be boosted to be sprayed, so that the ship is propelled. One single screw is arranged and is provided with a plurality of heads; screw edges are very narrow and have large screw pitch, so that the depth of a screw thread gradually becomes shallow to achieve the effects of large flow and high pressure; and the axial flow pump is designed by combining excellent aerofoils according to a variable-circulation variable-axis surface. The pump has a very simple structure, has good manufacturability and is easy to manufacture; the high-efficiency axial flow and screw combined pump is convenient to install; the high-efficiency axial flow and screw combined pump rotates at the high speed, has small volume and light weight, is efficient and energy-saving; the high-efficiency axial flow and screw combined pump has the self-adsorption capability and the ship has high sailing speed; the high-efficiency axial flow and screw combined pump can be made to have large power; the high-efficiency axial flow and screw combined pump has double-injection capability, a steering engine is saved and the high-efficiency axial flow and screw combined pump has high performances which cannot be realized by a single low speed axial flow pump or mixed-flow pump injection propeller.

Description

1. Technical field [0001] The invention relates to providing a structure of a marine high-efficiency axial-flow screw optimized combined pump, which is used for modern high-speed ship pump water jet propulsion, and can also be used alone with a screw pump or a single axial-flow pump. The positive displacement pump can also compress air to form the air cushion of the hovercraft. 2. Background technology [0002] 2.1. I have applied for an invention titled "horizontal double-arc gear pump for high-speed ships", and the patent application number is 2009101732167. This is an innovative design based on repeated technical exchanges with an American high-speed power system technology company in China, and has been well received. The U.S. side also provided a lot of information on the widespread use of axial flow pumps in the world and photos of the latest high-speed, high-efficiency propellers. I hope that I can also make innovations in axial flow pumps. This is the common wish of...

AI Technical Summary

Problems solved by technology

[0010] 2.6 According to the "Selection of Pumps" manual: the efficiency of the vortex pump is 36-38%.

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