Sealing and cooling device
AssigneeITT Manufacturing Enterprises, Inc.
InventorGert Hallgren
Life of this patent
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Abstract
The invention concerns a sealing- and cooling system for a submersible machine, such as a pump or a mixer. The device comprises an easily replaceable (4) containing mechanical face seals with an intermediate room for a barrier liquid where a circulation pump (10) is arranged for circulation of said liquid along the seals as well as around the driving unit (1) of the machine. During circulation, the liquid passes a first narrow gap (6) around the driving unit where heat is absorbed and a second narrow gap (7) where heat is discharged.
Claims1
A sealing and cooling device for a submersible machine, such as a pump or a mixer, said submersible machine comprising a driving unit such as an electric motor (1), a hydraulic unit (2) with a pump impeller or a propeller connected to the motor via a driving shaft (3) and an intermediate seal unit (4), the latter comprising two mechanical face seals, separated by a room containing a liquid which acts as a barrier medium for the two seals as well as a cooling medium for the motor, a circulation pump (10) for said medium being integrated in the seal unit (4), characterized in that
- the barrier/cooling medium during its circulation obtains a mainly turbulent flow and passes at least two narrow gaps, a first gap (6) surrounding the stator (5) of the motor, where heat is absorbed, and a second gap (7) which on one of its sides is limited by a wall (9) that is cooled by the working medium of the machine, said second gap (7) being mainly radially directed and having a radially inward increasing width for compensation of the inward decreasing space, thereby securing an essentially constant cross section and a constant flow speed through the gap.
Dependencies are inferred from the claim text.