Pump-jet water propeller system for five-element combined ship

Abstract

The invention provides a structure of a pump-jet water propeller system for a five-element combined ship. A screw pump, a multi-stage series axial-flow pump and other members are optimally combined in the system, which generates a qualitative leap, achieves the purpose of super-powerful water-jet propulsion, meets the requirement of super-powerful propulsion for various modern high-speed ships and the requirement of energy saving, and eliminates the fatal flaws of water-jet propulsion using a screw propeller or a single axial-flow pump or mixed-flow pump in terms of principles. The five innovation points are as follows: a first element is a pre-mounted multi-stage dual-circular arc gear pump which is used for guaranteeing and increasing pressure and speed, a second element is a screw pump, a third element is a multi-stage axial-flow pump, a fourth element is an air / water co-jet boost structure and a fifth element is a guide pipe which is mounted at a jet mouth to achieve the energy saving effect. The two independent pumps are arranged inside a cabinet and produce less noise. The pump-jet water propeller system is suitable for being set with a super-high power to support the large-sized and high-speed ships. The third element, the second element and the first element are assembled in sequence to form an air pump for ships. The pump-jet water propeller system is applied to the development and application of the high-speed ships and can promote the development of related industrial chains.

Description

1. Technical field [0001] The present invention relates to providing a structure of a five-element combined marine (super) pump water jet propulsion system. "Five elements" means: on the basis of the application number 2010102804444.7 "quaternary combination marine pump water jet propulsion system", a fifth element is added to form a new system to meet the needs of modern high-speed ships for large-scale and high-speed ships. Propulsion requirements and energy saving, reasonable design structure and good manufacturability, replace the widely used marine single axial flow pump or mixed flow pump water jet propeller. 2. Background technology [0002] 2.1 The article "Pump Jet Propulsion" pointed out that "compared with submarines propelled by large skewed propellers, the biggest advantage of the submarine propulsed by the pump jet is that it can greatly reduce the radiation noise of the submarine propeller and increase the low-noise speed of the submarine." . After the subma...

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Problems solved by technology

[0003] 2.2 In the above-mentioned article "Pump Jet Propulsion", it also pointed out that the use of this innovative pump in the United States still has many problems that are difficult to solve: "The structure is complex, the weight is heavy, ... it is 2 to 3 times that of ordinary propellers, and it is difficult for the hull trim, The structural strength of the tail of the hull and the vibration of the propeller shafting have a greater impact”; moreover, because the structure is much more complicated than that of the propeller, it is necessary to “apply new materials and advanced manufacturing technology, resulting in high manufacturing costs. Thruster's Biggest Flaw

[0007] 2.6 Defects of the single axial flow pump: it "can only produce a small pressure, because there is no radial fluid flow in the geometry, and the centrifugal force is located on the plane perpendicular to the surface, and the fluid flows along these surfaces , so the centrifugal force does not do work

But according to the ship's thrust equation, the thrust increases sharply proportional to the square of the flow velocity, so the flow velocity at the outlet of the axial flow pump is slow, which is extremely unfavorable for the ship to obtain high speed

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