Pump wet end replacement procedure complete with an impeller...

Details Pump wet end replacement procedure complete with an impeller... Pump wet end replacement procedure complete with an impeller...

F - Mech Eng,Light,Heat,Weapons

04

D

F04D 29/62 (2006.01) F04D 7/02 (2006.01) F04D 29/42 (2006.01)

Patent

CA 2572362

The pump comprises: one base, wet end and a rotating impeller connected to the drive shaft. The wet end has a casing formed by two bolted halves with faces or surfaces, inside the casing is the impeller screwed to the drive shaft. Wet end liner and impeller replacement is normally carried out by changing the complete pump or by dismantling the pump wet end in situ and removing the wet end liners and impeller component by component. To avoid vibration and prevent damage to the pump a precise re- alignment of the impeller and the drive shaft is necessary. Such a procedure during wet end liner and impeller replacement takes in excess of 8 hours. This long period of time is the technical problem that is resolved by the present invention which incorporates an impeller fixing device that allows removal of the pump wet end without disengaging the drive shaft from the coupling; therefore it does not require shaft re- alignment or wet end dismantling in situ. The impeller fixing mechanism is comprised of two elements concentric with the pump drive shaft, abutted against the casing faces. The elements are split-annular shaped, with a flexible elastomeric member and a stiff backing ring member where the clamping bolts fasten the mounting faces together. In addition, the backing ring member incorporates the mechanism for loosening the mounting bolts and nuts.

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