| 摘要 |
PURPOSE: To prevent damage to a ring packing at the time when a shaft is redriven after it is left in a stationary state in a liguid medium of extremely low temperature for a long period of time. CONSTITUTION: A shaft bush 22 is installed on a screw shaft 1, and ring housings 3-7 are arranged in such a way as to surround it. Lip packings 12a-12d are arranged between the adjacent ring housings, ring chambers 13i, 13m, 13a are formed between each of the lip packings, and lubricant supply pipes 15i, 15m, 15a are connected to them. Expansion bodies 14i, 14m, 14a having ring tubular shapes are arranged in the ring chambers, and it is made possible to inject a heating and pressure medium through ring conduits 16i, 16m, 16a. |
