Mechanical seal assembly with coolant circulation structure.

摘要

Shaft (12) rotates within a gland ring (17) and carries a first rotating seal ring which engages an axial end face of a stationary seal ring mounted in the gland ring (17) and a second rotating sealing ring which engages an opposite end face of a second stationary seal ring. An annular channel (32) is defined between the stationary seal rings for the flow of coolant from inlet (36) to outlet (37). Flow of coolant in a closed circuit through heat exchanger (39) is maintained solely by rotation of the shaft since a dam (41) prevents flow from the outlet (37) to the inlet (36) around the shaft and the inclined end faces (43) and (44) of the dam deflect the coolant into and out of the channel (32).
The arrangement operates in both directions of rotation of the shaft, the coolant flow being in opposite directions around the circuit. While designed for a double or tandem seal the coolant circulation can also be used with a single seal.