| 摘要 |
A magnetic fluid shaft-sealing device includes a seal cover (3) attached to a pump housing (1) in which a rotary shaft (2) is mounted. The seal cover (3) includes a shaft hole (33) extending from an inner end face (31) through an outer end face (32) along an axis. The seal cover (3) further includes an annular recess (36) formed in the outer end face (32) and around the shaft hole (33). An inner ring portion (363) is defined between the annular recess (36) and the shaft hole (33). A collar (4) is mounted around the rotary shaft (2) to rotate therewith and includes a first end (41) received in the annular recess (36) and around the inner ring portion (363) of the seal cover (3). A magnet (6) and two pole pieces (5) are mounted between an outer periphery (364) of the inner ring portion (363) of the seal cover (3) and the first end (41) of the collar (4). A gap (71) is formed between an inner periphery (440) of the first end (41) of the collar (4) and outer peripheries of the pole pieces (5), and a magnetic liquid (7) is filled in the gap (71) to provide a liquid seal therebetween.
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