| 摘要 |
A combined sealing device for a rotary shaft, in which the combined sealing device comprises the ring (5), the left bearing (6), the left septum magnetic ring (7), a magnetic fluid sealing assembly, the right septum magnetic ring (11), and the right bearing (12) which are arranged inside a housing (18) in series, after the magnetic fluid is injected into the pole teeth of pole pieces in the magnetic fluid sealing assembly, the shaft housing is loaded into the inner hole of the above-mentioned parts, then the second end cover (15) is fixed on a housing by screw nails (16) to press the outer ring of the right bearing tightly, after that, the first end cover (14) is fixed on the shaft housing (1) by screw nails (13) to press the inner ring of right bearing tightly, so that a magnetic fluid seal is device is achieved, the left end external surface of the shaft housing is the conical surface, and the left end inner hole of the housing is the taper hole which has the same taper as the left end of shaft housing and in which spiral groove is processed, the left end external conical surface of the shaft housing coordinates with the left end spiral groove of the housing provided in the taper hole, so that a conical spiral seal is achieved. This device has the advantages such as a long service life, a reliable seal, and no pollution.
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