Seal structure between a rotatable member and a stationary member

摘要

A seal structure includes a stationary member (2), a rotatable member (3) disposed within the stationary member (2) to divide an interior of the stationary member (2) into two chambers (4, 5), a seal member (1) mildly pressed to the stationary member (2) and the rotatable member (3), and a recess (7) for collecting grease, formed in the rotatable member (3). The seal structure can be used as a seal between a rotatable member (3) and a stationary member (2) of an air supply and gas exhaust switching mechanism (40) of a regenerative combustion burner (13).