Sealing mechanism of gas -tight body exchange

The utility model relates to a sealing mechanism of gas -tight body exchange especially relates to one and is used for preventing that gas carries out gas by the clearance that forms and exchanges between mounting and the rotator spare, include mounting (1), rotating member (2), receive piece (3), briquetting (4), support piece (5) and connecting rod (6), sealing device (11) form pressure regulating space (12) along the surface setting of rotating member (2), and sealing device (11) are made by flexible material. The during operation has necessarily when gaseous in pressure regulating space (12), possess certain pressure, and this pressure is exerted pressure to the briquetting, ingeniously stores up the existing gas body through these pressure regulating space (12) to utilizing the gaseous pressure that produces in pressure regulating space (12) to realize press?the?sealing, prevent that gas carries out the gas exchange through the clearance that forms between mounting (1) and rotating member (2), and the pr