专利名称：Apparatus and method for reducing effects
of draft tube pressure fluctuations
发明人：Geffs, John J.申请号：US07/328578申请日：19890327公开号：US04898512A公开日：19900206
摘要：Apparatus and method for reducing the effects of draft tube pressurefluctuations acting on a runner in a hydraulic reaction turbine or the effects of suctiontube pre-rotation acting on the impeller in a centrifugal pump. A closed surge
suppression chamber is mounted about the exterior of the turbine draft tube or pumpsuction tube. A plurality of openings are provided about the exterior of the draft tube orpump suction tube communicating with both the interior of the draft tube or pumpsuction tube and the interior of the chamber near its bottom thereof. An air inlet isprovided leading into the chamber at the top thereof. In operation, and during operationof the turbine or pump where a rotating helical vortex of water has formed in the drafttube or pump suction tube, water flows from the draft tube or pump suction tubethrough the openings and into the bottom of the chamber while air is injected into thetop of the chamber. This forms an air bubble in the chamber and forces air through theopenings into contact with the lower pressure center of the vortex as it rotates in thedraft tube or pump suction tube abating the same. This chamber also provides an aircushion to attenuate pressure surges which may be provided as the helical vortex rotatesthrough the elbow in a hydraulic reaction turbine draft tube or pump suction tube, and it
also provides an air cushion when the water vapor bubbles in the core of the vortexcollapse.
申请人：GEFFS, JOHN J.
代理人：Mark C. Jacobs
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