Patent ID: 6242829
Filing Date: 2001-06-05
Classification: E21B,F04B,F04D,H02K

Abstract:
A motor protector comprising:a casing coupled between a downhole pump and a downhole motor;a first chamber defined within the casing, the first chamber having a driveshaft extending therethrough and a first fluid port adapted to couple the first chamber to fluid within the downhole motor;a first slidable member axially slidable along the driveshaft;a first mechanical seal mounted around the first slidable member and disposed between the first slidable member and the driveshaft; anda first bellows disposed in the first chamber around a portion of the driveshaft to retain the fluid, the first bellows having a first end and a second end, the first end of the first bellows being coupled to a first stationary member and the second end of the first bellows being coupled to the first slidable member, the second end of the first bellows and the first slidable member being moveable axially along the driveshaft within the first chamber in response to pressure of the fluid within the first bellows.