| Gas face seal as a novelty type of mechanical seal is rapidly developed, which can be used to seal gas or liquid media. Because of its good seal performance, the non-contacting seal technology has found its application for pumps and agitators shortly after being widely used in compressor field. At home more and more companies and universities started research projects on the new seal technology, but most research projects are concerned with the high speed field. It is an important orientation that gas lubricated mechanical seal is applied in the low speed equipment.The stable operation property of gas face seal is always a hot and difficult spot at home or abroad. According to the related reports, the stability problem on gas lubricated face seal which is applied in the low speed operation is rarely reported systematically.As to the mentioned problems above, the narrow grooved theory developed by Muijderman is used in this paper, set up the mathematical model on the spiral groove gas face seal, programmed the programs with C++ language for solving the differential equation for the pressure distribution with a compressible medium in order to research the rules of gas flow between the mate rings. According to the above analysis and computed results, the programs to solve the gas film opening force , lifting speed, balance film thickness , leakage, stiffness, etc are completed.With the developed programs, the effects to seal performance of seal geometry parameters(such as spiral groove, groove height, groove number, groove width, groove length) and operation conditions(such as seal pressure, rotate speed, medium viscosity) have been investigated at low speeds.The dynamic model for gas face seal under axial perturbation is set up and the laws for the gas film vibration between the mate rings are researched and the rules for the ring vibration are found. |
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