Patent attributes
A primary technical goal of this shaft seal device is to decrease the pressure of a sealant at a communication passage between a fluid chamber and a first seal portion, to further reduce the pressure by a floating ring, to make the first seal portion pressure-proof for sealing a high pressure process fluid, and to reduce the cost of the shaft seal device by simplifying its structure. The device comprises a fluid chamber being located between the first seal portion and the second seal portion, an intake passage being communicated to a communication passage between the fluid chamber and the first seal portion for allowing a sealant S to flow in, a floating ring being disposed within the fluid chamber and defining a pressure reduction gap between its own inner surface and the rotary shaft, and an outlet passage being communicated to the pressure reduction gap for circulating the pressure reduced sealant.
