| 摘要 |
PURPOSE:To facilitate designing and calculating generated dynamic pressure by dividing a seal surface into a dynamic pressure generating area and a non-dynamic pressure generating area which have several grooves different in depth in a mechanical seal comprising a rotary seal ring and a fixed seal ring which are set opposite in contact with each other. CONSTITUTION:A mechanical seal comprises a rotary seal ring 9 fixed to the rotation side and a fixed seal ring (not shown) retained by a spring in such a manner as to move axially on fixed side which are set opposite in contact with each other. A seal surface 10 of the rotary seal ring 9 that is opposite in contact with the fixed seal ring is peripherally divided into a dynamic pressure generating area A and a non-dynamic pressure generating area B alternately. In this case, the area A is set narrower than the area B, and each area A is etched to form an equal number of grooves 11 having a comparative shallow depth with angle of advance. One deep groove 12 extending over the width of the area is similarly formed in each area B in such a manner as to have angle of advance. |
