Patent ID: 9046107
Filing Date: 2015-06-02
Classification: F04D

Abstract:
1. A vertical double-suction pump, comprising: a casing assembly having an inner casing assembly portion and an enclosing tube configured to house a stationary bearing and to contain lubricating oil inside the enclosing tube; a shaft configured to rotate in relation to the stationary bearing, the shaft having a rotating seal affixed thereto with a rotating sealing face; and an integral bellows type mechanical face seal formed as one piece, having one stationary end that overlaps and clamps to the stationary bearing, having another stationary end with a stationary sealing face that couples to the rotating sealing face of the shaft so as to provide a seal, and having an intermediate bellows-like portion with at least two expanded portions configured under compression to urge the stationary sealing face against the rotating sealing face and to adapt to large variations between the stationary sealing face and the rotating sealing face in order to provide the seal for the lubricating oil contained inside the enclosing tube so as to prevent leakage of the lubricating oil and to isolate and keep clean the lubricating oil, the enclosing tube, the shaft and the integral bellows type mechanical face seal being arranged in relation to one another along a vertical axis of the vertical double-suction pump, and the enclosing tube being arranged above the integral bellows type mechanical face seal in relation to the vertical axis, so the lubricating oil is provided via a gravity feed.