A kind of blade head cantilever type runner

Abstract

The invention discloses a blade head suspension type runner, which belongs to the technical field of hydraulic machinery equipment and includes an upper crown, a lower ring and a plurality of blades, and is characterized in that: the blades include a water inlet side and a water outlet side, and the water inlet side and the water outlet side The intersection point of the upper crown is A, the intersection point of the water inlet edge and the lower ring is B, the intersection point of the water outlet edge and the upper crown is C, the intersection point of the water edge and the lower ring is D, and the water inlet edge and the water outlet edge of at least one blade are curved Yes, the blade is sunken towards the inner side of the runner, the distance between any point P on the water inlet side and the straight line between points A and B is the largest at the middle point M on the water inlet side, and the radius Ra of the intersection point A is greater than the radius of the intersection point B Rb, the radius Rm of the middle point M is greater than the radius Ra of the intersection A, and the radius Rm of the middle point M is greater than the radius Rb of the intersection B. The invention can improve the S characteristic and the pressure pulsation performance of the water pump turbine, and the special geometric feature of the runner blade can make the unit more stable in the grid-connected process.

Description

Technical field [0001] The present invention relates to the technical field of hydraulic mechanical equipment, and more particularly to a blade head is long-induced. Background technique [0002] With the rapid development of the pumping energy storage power station, the stability of the pump turbine is increasingly attached to the industry, and the unit can quickly and stabilize and stabilize the normal operation of the power system in the peak frequency. However, the current of the traditional pump water turbine rotirs is usually a straight line. The S characteristics and pressure pulsation characteristics of this runner are generally poor, and there is a risk that the operation is unable to smooth and grinnet. [0003] The wheel includes a plurality of blades that are on the crown, lower ring and mounted therebetween. When the hydraulic machine is a turbine mode, the water flow flows from the high pressure edge of the wheel, that is, the low pressure side of the wheel, the low...

AI Technical Summary

Problems solved by technology

[0009] The Francis runner used for hydraulic machinery disclosed in this patent document relates to the radius change of the blade height direction of the Francis runner: the middle radius is the smallest, the upper and lower ends are large, and the bending direction of the water inlet edge is concave. This geometric feature It cannot better guide the water flow into the runner channel, especially it cannot effectively improve the internal flow state of the cavity in front of the runner under partial load or no-load conditions, and it cannot significantly reduce the defects caused by the S characteristic and pressure pulsation of the pump turbine. influences

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