| 摘要 |
<p>A gland with a frontal-sliding seal of the kind in which the sealing pressure between a graphite ring (22) and a hub (14) of a pump rotor (12) is applied by an elastomeric cup spring (24) cooperating with a helical spring (34), the front face of the base (26) of the cup spring having a number of concentric annular crests (28A, 30A, 32A) in sealing contact with the graphite ring (22) has, to improve this sealing contact, a pressure distributing ring (36) incorporated in the base (26) of the cup spring, and a circumferential groove (38) provided in the outer circumference of the base. <IMAGE></p> |
