Importance

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Abstract

A ferrofluid sealing apparatus with small diameter used in low temperature, in which the first bearing (6), the first magnetism isolating ring (9), the first pole piece (10) installed with the first O-ring (11), the magnet (13), the second pole piece (15) installed with the second O-ring (14), the second magnetism isolating ring (16) and the second bearing (17) are provided to abut against in series and are sandwiched between the two inner bosses of the outer casing (8). the large end cover (19) is installed on the outer casing (8) using screw 18 to press the second bearing (17), the ferrolluid (2) is injected into the inner torus of the magnet (13), the permeable casing (1) installed with the adjusting shim (20) is installed into the inner hole of the above assembled bearings and pole pieces, the permeable casing (1) is fixed with the small end cover (5) using screw (4), the parameters of the teeth on the outside of the permeable casing are selected in such a way that the width is 0.5 mm, the height is 2.5 mm, and the width of the grooves is 1.5 mm, the first magnetism isolating ring (9) is installed between the first bearing (6) and the first pole piece (10); the second magnetism isolating ring (16) is installed between the second bearing (17) and the second pole piece (15). This apparatus solve the problem of ferrofluid sealling in low temperature.

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First Claim