Mechanical seal

The utility model relates to a mechanical seal, including outer end cover, the outer axle sleeve of pivot is located to the cover, and the one -level that lies in on the axle sleeve is sealed with the second grade, the sealed sealed atmospheric side of one -level that is located of second grade, axle sleeve, one -level are sealed up, the second grade is sealed encloses into sealed chamber with outer end cover, the sealed upper reaches pump sending mechanical seal that is of second grade, upper reaches pump sending mechanical seal includes quiet ring, rotating ring, elastic component and spring holder, quiet ring and outer end cover fixed connection, spring holder and rotating ring cover are located outside the axle sleeve, elastic component is located between spring holder and the rotating ring, be equipped with the seal groove on the terminal surface of rotating ring or quiet ring, the outer end in the sealed outside of second grade is covered and is equipped with sealingfluid inlet and seal fluid outlet. Se