Abstract
This paper presents a new concept for a self-acting, rotating-shaft gas seal. One of the seal faces is elastically distorted to provide a converging tilt and wavy shape on the face. The tilt enhances hydrostatic load support while the waviness enhances hydrodynamic load support. By moving the wave slowly elastically, this unique shape is preserved in spite of any wear. Leakage is essentially blocked by a continuous sealing dam around the seal. Advantages claimed are low leakage and tolerance to liquid contamination. Theory is presented for the operation of the seal. A model is developed to predict performance. Friction, leakage, film thickness, and relative wear rate are predicted. The predictions show that load support is adequate under pressurized operation. Friction is very low. When operating at zero pressure differential, a very smooth surface (low roughness) is necessary so that waviness can produce enough hydrodynamic load support to lift off. Seal leakage is very low and is insensitive to speed. E...
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