Seal device

A seal device that seals between a housing and a rotation shaft passing through the housing, the seal device comprising:

• a floating ring arranged with a gap with respect to the rotation shaft;
• and
• at least one supporting means that supports the floating ring contactlessly in a circumferential direction,
• wherein the at least one supporting means comprises:
• a first magnet arranged in the housing and having magnetic pole faces each directed in the circumferential direction;
• and a second magnet arranged in the floating ring and having magnetic pole faces each directed in the circumferential direction, said first magnet and said second magnet being arranged in a manner that each magnetic pole face of the first magnet and each magnetic pole face of the second magnet which face each other have a same magnetic pole, and
• wherein the floating ring comprises:
• a seal ring;
• a retainer being an annular member made of a non-magnetic material and fitted to and covering a radially outer circumference of the seal ring;
• and the second magnet which is arranged in a radially outer circumference of the retainer.