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.