MECHANICAL FACE SEAL WITH A REVERSE TRAPEZOIDAL FACE PATTERN
World Intellectual Property Organization Patent
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Abstract
An improved mechanical face seal is provided which includes a pair of relatively rotatable seal rings having opposing seal faces. At least one of the seal faces (72) includes a reverse trapezoidal face pattern (75) having a sine wave depth profile wherein individual face features are circumferentially spaced over the seal face (72). The reverse trapezoidal face pattern (75) serves to generate a hydrodynamic lift which provides a stable separation of the seal faces that permits formation of a fluid film between the seal faces. The individual trapezoidal grooves (76) have a sinusoidal or similarly shaped depth profile wherein the trapezoid shape is arranged with the narrower edge (78) communicating with the high pressure side of the seal, and the wider edge (79) forms a circumferential dam region (81) towards the low pressure side of the seal. Alternatively, the reverse trapezoidal face pattern may also be provided as a primary face pattern on a dry gas seal in combination with a secondary face pattern wherein the faces operate with a controlled gap under normal pressure conditions as well as when the pressure direction across the seal face is reversed.
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Family
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Cited Art Landscape
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