Counter pumping debris excluder and separator

Details Counter pumping debris excluder and separator Counter pumping debris excluder and separator

1976-03-31

1978-04-18

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277134, F16J 1540

Patent

active

040848256

ABSTRACT:
This application discloses a dirt separator and excluder for removing entrained debris from gas turbine shaft seals. A helical groove pattern is constructed on the rotating shaft with the pumping pattern such that it tends to pump seal pressurizing gas toward the gas turbine seal. A second helical groove pattern is provided on the stationary housing or counter rotating member coaxial with the shaft, and this pattern is designed to provide pumping in the direction opposite from that of the groove pattern on the shaft. Gas with entrained debris entering this grooved area will be subjected to high centrifugal forces due to the swirl motion induced by the groove pattern and the rotation of the shaft. This debris is centrifuged outwardly into the outer groove pattern on the housing or counter rotating member. Since the outer groove pattern has a pumping direction opposite from that of the seal, dirt is pumped away from the seal and can be collected in a suitable debris trap remote from the seal location.

REFERENCES:
patent: 3746350 (1973-07-01), Mayer et al.
patent: 3843140 (1974-10-01), Mayer et al.
patent: 3940150 (1976-02-01), Martin et al.

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