Double-impeller serial pump with cone-shaped hubs

Abstract

The invention relates to a double-impeller serial pump with cone-shaped hubs. The double-impeller serial pump comprises hubs, a primary impeller, a secondary impeller and a guide vane. The primary impeller, the secondary impeller and the guide vane are sequentially arranged on the hubs. No guide vane is arranged between the primary impeller and the secondary impeller. The hubs are cone-shaped hubs varied in hub ratio, the primary impeller is a non-adjustable impeller, and the secondary impeller is an adjustable impeller. Due to the adoption of serial arrangement, the size and the weight of a water spray push system are reduced. As the cone-shaped hubs varied in hub ratio are used and loadings on the two impellers are optimized and matched, the energy characteristic of the pump is improvedand the cavitation performance of the pump is boosted. The pump has the advantages of large flow, compact structure, small space dimension, excellent energy characteristic, good anti-cavitation performance and the like.

Description

technical field [0001] The invention relates to a water pump, in particular to a water pump with two impellers juxtaposed by a conical wheel hub, which belongs to the field of hydraulic machinery. Background technique [0002] Achieving high-speed miniaturization has always been a trend in the research and development of fluid machinery, and it has irreplaceable significance in high-tech and national security fields such as aviation, aerospace, and underwater and surface weapons. To achieve high-speed miniaturization, from the aspect of fluid dynamic design of fluid machinery, it is necessary to solve the problem of high-efficiency design of high-load blades. cavitation problem. Applying multi-stage form is one of the ways to achieve energy conversion with high efficiency and high cavitation performance. [0003] At this stage, for applications that require relatively high power but have limited space, the technical solution of a two-stage axial flow pump is usually adopte...

AI Technical Summary

Problems solved by technology

Since the first-stage guide vane is set between the first-stage impeller and the secondary impeller, the axial dimension of the pump is extended and the weight is increased, which cannot meet the requirements for the weight and size of the water jet propulsion system

Therefore, the spatial arrangement of two-stage axial flow pumps is very difficult when space is limited or weight is limited

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