Device for conveying medium such as circulating piston pump has sealing rollers or balls sliding on housing wall as first and second wheels rotate without contact

摘要

The device has between a first and second wheel (30, 24) sealing elements (28) such as rollers or balls which slide on the housing wall (22a, 22b) of the device during rotation of the wheels without contact. The sealing elements are housed secure against loss in bearing shells of the wheels. A lubricant is provided on the friction faces of the sealing elements. The conveyor device can be a drive or pump for conveying fluid.