非接触ガスシールの研究

概要

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The need in advanced turbomachneries for shaft seals with improved pressure, temperature, and speed capabilities is pointed out. In particular, the high-speed requirment suggests that the seals must not have rubbing contact. Labyrinth seals have disadvantage in high leakage and conventional face seals are subject to high wear and thus cause heavy rubbing contact. There-fore, the seals with small air gaps based on the principle of hydrostatic or hydrodynamic gas bearings have become of special interest recently. This paper desctribes the theoretical design methods and experimental results of hydrostatic face seals and self acting (spiral groove) face seals with bellows for secondary seals. The results showed that, 1. The experimental results on leakage rate and face balancing condition of hydrostatic face seals agree with theoretical predictions. 2. The experimental results on presure rise coefficient G^^- of spiral groove seals are 65% of the theoretical values. 3. The leakage rate of these seals is less than one tenth of that of a labyrinth seal, and sometimes can be reduced to zero. 4. Clearance and seal plate dimensions must carefully be selected to eliminate instabilities.
独立行政法人海上技術安全研究所の論文
1972-05-31