Research On Performance Of The Centrifugal Seal With Continuous Injection And Elimination Of The Sealing Fluid

The centrifugal seal of the continuous injection and elimination(CSCIE)of the sealing fluid is presented. Many problems when the centrifugal seal isused to seal gas at high rotational speed, such as too high temperature rise perunit time, low sealing pressure and the difficulty of the shut down seal, aresolved by the CSCIE, and the feature of zero wear, zero leakage and longworking life are also remained. Finally, the blank of the study of thecentrifugal for sealing gas at high speed is filled.Theoretical analysis and experimental validation are combined to studythe performance of the seal: The liquid flow and gas flow in the sealingchamber is modeled and analysed by the software Fluent. The failure modes ofthe seal is given by analyzing the rules of the change of the air-water interfacein the sealing interstices of the high and low pressured side, and then theregularity of the series performance parameters with operating conditions isgained; The prototype has been realized and the hydraulic and pneumaticcontrol system of the mating prototype is established. The experimental studyof the seal is done and the accuracy of the simulation results is approved bythe experiment. The optimization research of the structural parameters and the type ofconstruction of the seal is done. The levels and weightiness of the influence ofmain structural parameters versus sealing performance are analysed by thenumerical simulation and orthogonal test, which conducted the design of thestructural design. And then a set of the optimum parameters that have bettercombination property are given. The centrifugal impeller with dynamicpressure groove and the centrifugal seal with the rotating shell not only extendthe range of the seal, but also effectively reduce the temperature rise of thesealing fluid in the sealing cavity, which makes the centrifugal seal probablybecome a new type gas seal applying for the shaft end sealing.The results of above research offer theory support and test verification forthe extension of the centrifugal seal with continuous injection and eliminationof the sealing fluid in the field of sealing gas at high rotational speed, andprovide a guidance for the optimization design of the seal in future.