Seal device employing magnetic fluid

A seal device employing magnetic fluid, the seal device adapted for sealing off a vacuum side and an atmosphere side, and furnished between a housing and a rotating shaft,

• the seal device characterized in being equipped with a magnetic fluid seal furnished in an axial center portion within said housing, and rolling bearings furnished to both sides of said magnetic fluid seal;
• a lubricated portion of said rolling bearings at both sides being filled with a magnetic fluid;
• in said rolling bearings at both sides, a magnet being installed on the vacuum side of an outer race of the rolling bearing disposed on the vacuum side, and a magnet being installed on the atmosphere side of an outer race of the rolling bearing atmosphere disposed on the atmosphere side;
• and
• on each of said respective magnets at the opposite side thereof from the outer race of the rolling bearing, a ring-shaped yoke made of magnetic material being installed in a loose-fitting manner about the rotating shaft.

A seal device employing magnetic fluid, the seal device adapted for sealing off a vacuum side and an atmosphere side, and furnished between a housing and a rotating shaft,

• the seal device characterized in being equipped with two rolling bearings disposed spaced apart so as to support said rotating shaft in double-supported fashion inside said housing;
• a lubricated portion of the rolling bearing that, of said two rolling bearings, the rolling bearing disposed on the vacuum side being filled with a magnetic fluid, and a magnet being installed on the vacuum side of an outer race;
• and
• on said magnet at the opposite side thereof from the outer race of the rolling bearing, a ring-shaped yoke made of magnetic material being installed in a loose-fitting manner onto the rotating shaft.

A seal device employing magnetic fluid, the seal device adapted for sealing off a vacuum side and an atmosphere side, and furnished between a housing and a rotating shaft,

• the seal device characterized in being equipped with two rolling bearings disposed spaced apart so as to support said rotating shaft in double-supported fashion inside said housing;
• a lubricated portion of said two rolling bearings at both sides being filled with a magnetic fluid;
• in said two rolling bearings, a magnet being installed on the vacuum side of an outer race of the rolling bearing disposed on the vacuum side, and a magnet being installed on the atmosphere side of an outer race of the rolling bearing atmosphere disposed on the atmosphere side;
• and
• on each of said respective magnets on the opposite side thereof from the outer race of said rolling bearing, a ring-shaped yoke made of magnetic material being installed in a loose-fitting manner about the rotating shaft.