Volute type centrifugal pump with movable guide vane

Abstract

The invention discloses a volute type centrifugal pump with a movable guide vane. According to the volute type centrifugal pump with the movable guide vane, a rectifying grid is arranged at an outletof a suction elbow pipe, so that the energy loss of fluid at an inlet of a flow channel is reduced, the cavitation performance is improved, and vibration and noise are reduced. The movable guide vanestructure of the volute type centrifugal pump with the movable guide vane is arranged between an impeller outlet and a volute inlet, the angle of the guide vane can be adjusted according to differentworking conditions, and the flow at the impeller outlet can be rectified under different working conditions, so that the influence of unbalanced force is reduced, and the operation stability of a large unit is improved. Moreover, the structure is beneficial to reducing the impact loss caused by the fact that the water flow impacts the guide vane when the liquid flow at the impeller outlet enters the guide vane, so that the efficiency of the large centrifugal pump is improved.

Description

technical field [0001] The invention relates to a volute centrifugal pump with movable guide vanes, which belongs to the technical field of water pumps. Background technique [0002] Large-scale centrifugal pump units are mainly used in large-scale water conservancy projects such as water resource allocation and agricultural water use, and are characterized by large structural dimensions and large hydraulic unbalanced forces. Due to the economic cost constraints caused by the amount of foundation excavation and the limitation of site space conditions, large pumping stations adopt elbow-type suction chambers. The liquid flow is prone to large-scale eddy currents at the elbow of the suction elbow, which makes the flow of the liquid flow very uneven, resulting in greater resistance loss and friction loss during the operation of the centrifugal pump, and greater noise and vibration . In larger structural sizes, the volute is a thin-walled structure, and its structural stabilit...

AI Technical Summary

Problems solved by technology

The liquid flow is prone to large-scale eddy currents at the elbow of the suction elbow, which makes the flow of the liquid flow very uneven, resulting in greater resistance loss and friction loss during the operation of the centrifugal pump, and greater noise and vibration

In larger structural sizes, the volute is a thin-walled structure, and its structural stability is relatively weak. Unbalanced forces will generate unbalanced excitation for it during operation; in large centrifugal pump units, the resulting hydraulic imbalance If the force is very large, it will generate large vibration and excessive local stress, which will have an adverse effect on the rotor system running at high speed

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