Dynamical pressure non contact shape mechanical seal

摘要

PURPOSE:To suppress the reduction in dynamic pressure at the time of tilting a seal surface, and to ensure a seal gap so as to prevent a contact trouble between each seal surface by dividing a dynamic pressure generating group which is communicated with a fluid leading groove, and which is extended in a circumferential direction, into plural pieces, independently, in a diametrical direction. CONSTITUTION:When a rotational sealed ring 2A is rotated in the direction of an arrow (a), the fluid on a high pressure side Y is flown from a fluid leading groove 5 into each divided narrow group 6A, 6B, 6C of a dynamic pressure generating group 6, and a dynamic pressure is generated between a seal surface 2a of the rotational sealed ring 2A and a seal surface 4a of a static pressure sealed ring 4A, and a narrow seal gap is formed by the balance pressure between the energizing power and the spring force of a spring 3C, so as to carry out sealing in a non-contact state. When the rotational sealed ring 2A is relatively tilted, for example, although the generated dynamic pressure on the wider side of the seal gap is reduced, the reduction in the generating dynamic pressure in the divided narrow group 6A on the external side in a diametrical direction, is suppressed, while both of the seal surfaces 2a, and 4a are returned to an opposed position in parallel with each other, and a preset seal gap is ensured thereby, and the seal destruction or the damage to the seal surfaces 2a, 4a are thus surely be prevented.