Patent ID: 8042813

Claim:
A shaft-sealing device comprising, in combination: a seal cover adapted to be attached to a pump housing in which a rotary shaft is mounted, with the seal cover including a shaft hole extending along an axis of the rotary shaft, with the shaft hole including a first, enlarged shaft-sealing section having a diameter greater than that of the shaft hole, with the seal cover further including a coolant inlet through which a coolant is supplied into the first shaft-sealing section, with the seal cover further including a coolant outlet extending from an outer periphery of the seal cover into the first shaft-sealing section and intersecting the first shaft-sealing section at a first opening, with the first opening being delimited by a circumference having a first side and a second side downstream from the first side along a flowing direction of the coolant in the first shaft-sealing section; a shaft sleeve extending through the shaft hole of the seal cover and adapted to be mounted around the rotary shaft to rotate therewith, with a first stationary ring being mounted around the shaft sleeve and secured in the first shaft-sealing section, and with a first rotary ring being moveably mounted around the shaft sleeve and biased toward the first stationary ring to provide sealing engagement therebetween; a first fender projecting from the second side of the circumference delimiting the first opening into the first shaft-sealing section and spaced from the shaft sleeve, with the first fender having a side face facing the first opening, with the side face of the first fender guiding the coolant into the coolant outlet through the first opening when the coolant fed into the first shaft-sealing section flows through the first opening of the coolant outlet and encounters the side face of the first fender; and a first pumping ring mounted in the first shaft-sealing section and securely mounted around the shaft sleeve to rotate therewith, with the first pumping ring including an outer circumference having a plurality of protrusions annularly spaced from one another and extending along the axis to assist in driving the coolant in the first shaft-sealing section, with a gap formed between the first pumping ring and the first fender in a radial direction perpendicular to the axis, with the first pumping ring being made of copper, with the first fender being a substantially quadrangular plate, and with the side face of the first fender being at an acute angle with the circumference delimiting the first opening of the coolant outlet.