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Serial axial-flow water jet propulsion pump

A water jet propulsion, axial flow technology, applied in axial flow pumps, propulsion components, ship propulsion, etc., can solve the problems of large axial size and constraints, achieve compact axial size, avoid cavitation, and solve large thrust Effect

Inactive Publication Date: 2012-01-11
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of propulsion pump can meet the needs of high power, but because the two-stage impeller is equipped with guide vanes, its axial dimension is too large, which is restricted in practical application

Method used

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  • Serial axial-flow water jet propulsion pump
  • Serial axial-flow water jet propulsion pump
  • Serial axial-flow water jet propulsion pump

Examples

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Effect test

Embodiment Construction

[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] figure 2 , image 3 Shown is an embodiment of the axial-flow water jet propulsion pump of the present invention, including a suction elbow 1, a tandem impeller composed of an inducer 2 and a main impeller 3, a rectifier 4, a nozzle 5, an impeller chamber 6 and a pump Axis 7. The pump shaft 7 is arranged horizontally, the inducer 2 and the main impeller 3 are fixed on the pump shaft 7 by keys, and the axial distance between the inducer 2 and the main impeller 3 can be adjusted by a spacer 9 . The number of blades 11 of the main impeller is twice the number of blades 12 of the inducer, so that the tandem cascade composed of the inducer 2 and the main impeller 3 ha...

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Abstract

The invention discloses a serial axial-flow water jet propulsion pump which comprises a water suction elbow (1), a pump shaft (7), an impeller chamber (6), an inducer (2) and a main impeller (3), wherein the inducer (2) and the main impeller (3) are positioned in the impeller chamber (6); the pump shaft (7) is horizontally arranged; the inducer (2) and the main impeller (3) are fixed on the pump shaft (7) through keys; the outlet of the water suction elbow (1) is connected with the inlet of the inducer (2); the outlet of the main impeller (3) is orderly connected with a rectifier (4) and a jet pipe (5); and the area of the overflowing cross section gradually reduces along the central line of the flow channel to form a contracting flow channel. The invention avoids cavitation in the main impeller, solves the problems of cavitation under the operating conditions of large thrust and high speed of the water jet propulsion pump and reduces the axial size of the propulsion pump.

Description

technical field [0001] The invention relates to the technical field of hydraulic machinery, in particular to a tandem axial-flow water jet propulsion pump with high cavitation resistance and high power density. Background technique [0002] The water-jet propulsion device with the water-jet propulsion pump as the core component is an important propulsion method for ships and underwater vehicles. It advances under the impetus of the jet water reaction force. Compared with the traditional propeller propulsion technology, the pump-jet propulsion technology has the advantages of strong anti-cavitation ability, high propulsion efficiency, low vibration and noise levels, good maneuverability and strong adaptability to variable working conditions. [0003] Traditional water jet propulsion pumps mostly use mixed flow impellers or low specific speed axial flow impellers. In order to meet the needs of high-speed driving of the aircraft, the water-jet propulsion pump is required to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D3/00B63H11/04F04D29/20
Inventor 黎耀军王福军严海军
Owner CHINA AGRI UNIV
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