High water head water pump turbine rotating wheel double sealing pressure decreasing structure

Abstract

The invention discloses a high water head water pump turbine rotating wheel double sealing pressure decreasing structure. The maximum diameter position of a rotating wheel upper crown (20) in the radial direction is provided with an upper crown outer leakage stopping ring (6); the maximum diameter position of a lower ring (9) in the radial direction is provided with a lower ring outer leakage stopping ring (3); the upper crown outer leakage stopping ring (6) and the lower ring outer leakage stopping ring (3) are equal in damping; the minimum diameter position of the portion, on the low pressure side of a rotating wheel, of the lower ring (9) is provided with a lower ring inner leakage stopping ring (1); damping at the position of the lower ring inner leakage stopping ring (1) is smaller than that at the position of the lower ring outer leakage stopping ring (3); the diameter positions of the rotating wheel upper crown (20) and the lower ring inner leakage stopping ring (1) are providedwith an upper crown inner leakage stopping ring (4); and the upper crown outer leakage stopping ring (6) and the lower ring outer leakage stopping ring (3) are the same in diameter. The high water head water pump turbine rotating wheel double sealing pressure decreasing structure achieves the purpose of lowering the water pressure between the rotating wheel upper crown and a top cover, and therefore the purpose that the theoretical pressure between the rotating wheel upper crown and the top cover is within a reasonable range is fundamentally guaranteed.

Description

Technical field: [0001] The invention relates to a double-seal decompression structure for a runner of a water pump turbine with a high water head. Background technique: [0002] A pumped storage unit is a device that has the functions of pumping water and generating electricity, and can switch between the two opposite physical functions of the water pump and the turbine, and the motor and the generator. Compared with conventional Francis hydro-generator units, pumped-storage units have the characteristics of high water head, high speed, complex and multi-working conditions, and have extremely high requirements for safety and stability. [0003] For pump turbines with high water head, due to the high working water head, the water pressure acting on the top cover will increase accordingly. If the water pressure on the top cover cannot be well controlled within a reasonable range, the stress on the top cover connecting bolts will be at a relatively high level. The pressure o...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-head water pump turbine runner for the theoretical pressure between the upper crown and the top cover may be too high and the pressure amplitude may be too large when switching between different working conditions, which may affect the safe and stable operation of the unit. Double-seal decompression structure for high head water pump turbine runner

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