| 摘要 |
<p>A dynamic mechanical seal, comprising two annular sealing elements (11, 12) which are pressed against each other and are in contact by means of two corresponding faces (13, 14), a first static annular sealing element (11), directed toward a stuffing box of the machine body with which the mechanical seal is associated and forming a stationary face (13) rigidly coupled to a supporting flange (15), and a second rotating annular sealing element (12), which forms a rotating face (14) and is rigidly coupled to an external annular element (16), which in turn is fixed to a rotating shaft (17) and is externally adjacent to the flange (15) and to the machine body with which the mechanical seal is associated, the first annular sealing element (11) having a substantially frustum-shaped internal annular surface (18) which faces the rotating shaft (17), with a radius which is greater on the side of the stuffing box and a radius which is smaller proximate to the second adjacent annular sealing element (12), the frustum-shaped surface (18) forming a region for the recirculation of fluid inside the stuffing box away from the two annular sealing elements (11, 12).
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