Guide vane adjustable axial flow pump

Abstract

The invention relates to a guide vane adjustable axial flow pump which comprises a pump casing, wherein a pump shaft is arranged in the pump casing, a guide vane wheel hub is arranged on the pump shaft, a stationary cascade and a guide vane are sequentially arranged between the guide vane wheel hub and the pump casing from top to bottom, a blade wheel hub is arranged at the lower end of the guide vane wheel hub, blades are arranged on the blade wheel hub, one side of the guide vane is rotatably arranged on the guide vane wheel hub through a rotating shaft, a guide vane chassis is arranged on one side of the guide vane which is near to the pump casing, an angle adjusting knob is arranged on the outer side of the pump casing at the guide vane chassis, and the guide vane chassis and the angle adjusting knob are detachably connected through a bolt. The guide vane adjustable axial flow pump has simple structure and adjustable guide vane, and can eliminate the inlet incident angle of the guide vane and the flow separation vortex of the tail part and significantly reduce the hydraulic loss of the guide vane section.

Description

technical field [0001] The invention relates to an axial flow pump, in particular to an axial flow pump with adjustable guide vanes. Background technique [0002] Axial flow pump is a widely used hydraulic mechanical device, which is widely used in water diversion, agricultural water conservancy, urban water supply and military affairs. With the increasingly widespread application of axial flow pumps, reducing hydraulic loss and improving the efficiency of axial flow pumps has also been paid more and more attention. In order to solve the problem of hydraulic loss, methods such as designing new blades and optimizing the flow channel are often adopted, but the cycle is long and the cost is high. The most commonly used method is to install guide vanes behind the impeller of the axial flow pump. Studies have shown that the guide vanes of traditional axial flow pumps can generally recover about 10% of the kinetic energy. However, the traditional guide vanes are designed accordi...

AI Technical Summary

Problems solved by technology

However, the traditional guide vanes are designed according to the design working conditions and installed on the guide vane hub at a certain fixed angle, and the angle cannot be adjusted as the working conditions change. For example, the Chinese Patent Office disclosed a Axial flow pump (CN2931863Y)

The guide vane of this type of axial flow pump is fixed and cannot be adjusted. When it operates under non-design conditions, there is often an angle of attack at the head of the guide vane, and a shedding vortex appears at the tail, causing hydraulic loss and resulting in a loss of efficiency. decline

At the same time, the existence of the angle of attack at the head of the guide vane and the shedding vortex at the tail will lead to unstable operation and increased vibration

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