Adjustable axial flow pump with front guide vanes

Abstract

The invention relates to an adjustable axial flow pump with front guide vanes, namely, an adjustable guide vane device is arranged in front of a rotating wheel of the traditional axial flow pump. The front guide vanes are arranged in a suction chamber between a pump casing and a diversion cap, one ends of the front guide vanes are movably connected with bearings on the diversion cap through shafts, the other ends of the front guide vanes are movably connected with bearings on the pump casing through shafts, and a shaft connected with the pump casing penetrates through the pump casing and is connected with an external angle adjusting device; an inlet side of each front guide vane is oblique, and the outlet side of each front guide vane is horizontal; the two sides, close to the pump casing and the diversion cap, of each front guide vane are parallel to the pump casing and the diversion cap, and the side close to the pump casing is longer. The adjustable front guide vanes improve the hydraulic characteristics of a 'saddle area' of the axial flow pump, and broaden the stable operation range and the efficient operation area of the axial flow pump; in the engineering practice, the front guide vanes are adjusted according to different incoming flows and pump station lift conditions, so that the practical operation working conditions of the axial flow pump can be improved, and the efficiency and cavitation performance of the axial flow pump can be improved.

Description

[0001] technical field [0002] The invention relates to an adjustable axial flow pump with front guide vanes, which belongs to the technical field of hydraulic machinery. Background technique [0003] Axial flow pumps are widely used in production and life, especially in drainage, irrigation and long-distance water supply. However, objectively, when the axial flow pump works at a small flow rate, there is an area of ​​unstable performance, that is, the "saddle area", its hydraulic characteristics are extremely unstable, and the vibration and noise of the unit are severe; , the impact of the inlet of the runner blades will inevitably deteriorate the internal flow state, cause a large hydraulic loss, and reduce the operating efficiency. Therefore, due to the continuous changes in the upstream and downstream water environment conditions in the project, the actual operating conditions of the axial flow pump often deviate from the high-efficiency area or even the stable oper...

AI Technical Summary

Problems solved by technology

However, when the axial flow pump is in the "saddle area", the internal flow is more complicated and the hydraulic characteristics are more unstable. There is no axial flow pump with adjustable front guide vanes.

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