Patent ID: 6152452
Filing Date: 2000-11-28
Classification: F16J

Abstract:
A face seal with spiral grooves which is used on a rotating shaft of a machine, comprising:a rotating ring including a sealing face;a stationary ring including a sealing face; the sealing face of the stationary ring is confronted with the face of the rotating ring to form an annular sealing interface; the interface has a high pressure side, being an upstream side, and a low pressure side, being a downstream side;sealing fluid with low viscosity is in the interface;the face of the rotating ring can rotate relatively to the face of the stationary ring;two sets of spiral grooves are provided at least on one of the faces of the rotating and the stationary ring, wherein one set of grooves is disposed on the high-pressure side, which is on the upstream side which pumps sealing fluid downstream; and the other set of grooves is disposed on the low pressure fluid side which is at the downstream side, which pumps sealing fluid upstream;the ratio of the radial length of a groove on the upstream side to the radial length of a groove on the downstream side is greater than 1 and less than or equal to 5, excluding 1.50-2.33;a first non-grooved annular flat belt is formed between two sets of spiral grooves;a second non-grooved annular flat belt portion is formed at the downstream of the set of spiral grooves on the downstream side.