Patent ID: 8215644
Filing Date: 2012-07-10
Classification: F16J

Abstract:
1. A shaft sealing device comprising, in combination: a gland including a flange having an axial hole, with the gland further including a coolant inlet in communication with the axial hole and a coolant outlet in communication with the axial hole; a shaft sleeve extending through the axial hole of the gland and adapted to be mounted around a rotary shaft to rotate therewith, with the shaft sleeve including an end cap on an end thereof and a drive collar on another end thereof, with the end cap including a first drive pin, with the drive collar including a second drive pin; a first friction ring assembly including a first rotatable friction ring mounted around the shaft sleeve and a first stationary friction ring mounted around the shaft sleeve, with the first rotatable friction ring being coupled with the first drive pin of the shaft sleeve; a second friction ring assembly including a second rotatable friction ring mounted around the shaft sleeve and a second stationary friction ring mounted around the shaft sleeve, with the second rotatable friction ring being coupled with the second drive pin; and a guiding assembly mounted between the first and second friction ring assemblies, with the guiding assembly including first and second compression rings mounted around the shaft sleeve and a retainer mounted around the shaft sleeve and between the first and second compression rings, with the retainer including first and second sides and a plurality of through-holes extending from the first side through the second side, with a flexible element extending through each of the plurality of through-holes and including a first end pressing against the first stationary friction ring and a second end pressing against the second stationary friction ring, with the first compression ring pushing the first stationary friction ring to press against the first rotatable friction ring while the second compression ring pushing the second stationary ring to press against the second rotatable friction ring, with the retainer further including a plurality of first key ways and a plurality of second key ways, with the first compression ring including a plurality of first blocks slideably received in the plurality of first key ways, with the second compression ring including a plurality of second blocks slideably received in the plurality of second key ways, with the retainer further including a first tangent groove having a first inner end in communication with the axial hole and a first outer end in communication with the coolant inlet, with the first tangent groove further including first and second sidewalls and a first arcuate bottom wall interconnected between the first and second sidewalls, with the first arcuate bottom wall including a first inner edge located on an inner periphery of the retainer and a first outer edge, with a first spacing between the first inner edge and the first side of the retainer being smaller than a second spacing between the first outer edge and the first side of the retainer, with the first tangent groove having a width decreasing from the first inner end toward the first outer end, with the retainer further including a second tangent groove having a second inner end in communication with the axial hole and a second outer end in communication with the coolant outlet, with the second tangent groove further including third and fourth sidewalls and a second arcuate bottom wall interconnected between the third and fourth sidewalls, with the second arcuate bottom wall including a second inner edge located on the inner periphery of the retainer and a second outer edge, with a third spacing between the second inner edge and the first side of the retainer being smaller than a fourth spacing between the second outer edge and the first side of the retainer, with the second tangent groove having a width decreasing from the second inner end toward the second outer end.