Centrifugal pump having adjustable clean-out assembly

A centrifugal pump comprising:

• a) a pump housing;
• b) a removable rotating assembly including an impeller and a drive shaft defining an axis for said impeller, said drive shaft connectable with a drive source;
• c) a removable clean-out assembly supporting a wear plate in axial alignment with said impeller;
• d) a face clearance adjustment mechanism associated with one of said assemblies;
• e) said face clearance adjustment mechanism comprising at least one adjuster threadedly received by one of said assemblies and engageable with structure on said pump housing, such that rotation of said adjuster produces axial movement in its associated assembly towards and away from the other assembly;
• f) said adjuster rotatable to produce a predetermined clearance between said impeller and said wear plate;
• g) a locking member for inhibiting rotation in said adjuster in order to fix said face clearance established by said adjuster.

A centrifugal pump comprising:

• a) a pump housing;
• b) a rotating assembly including an impeller and a drive shaft defining an axis of rotation for said impeller, said drive shaft connectable to a drive source;
• c) a removable clean-out assembly supporting a wear plate in axial alignment with said impeller;
• d) a face clearance adjustment mechanism associated with one of said assemblies;
• e) said face clearance adjustment mechanism comprising at least one adjuster threadedly received by one of said assemblies and engageable with structure on said pump housing, such that rotation of said adjuster produces axial movement in its associated assembly towards and away from the other assembly;
• f) said adjuster rotatable to produce a predetermined clearance between said impeller and said wear plate;
• g) a locking member for inhibiting rotation in said adjuster in order to fix said face clearance established by said adjuster.

A centrifugal pump comprising:

• a) a pump housing including at least one fluid chamber;
• b) a pump impeller connected to a drive shaft for rotation therewith;
• c) at least one bearing for rotatably supporting said drive shaft, said bearing located within a bearing chamber;
• d) a seal assembly associated with said impeller including non-rotating and rotating portions, at least one of said portions being in fluid communication with said one fluid chamber;
• e) first and second, spaced apart seals sealingly engaging said shaft and located intermediate said seal assembly and said bearing chamber;
• and,
• f) said first seal associated with said bearing chamber;
• g) said second seal inhibiting fluid leakage along said shaft from said one fluid chamber;
• and,
• h) a discharge passage communicating with a region between said seals whereby any fluid that leaks past said first or second seals is discharged through said discharge passage.

A centrifugal pump comprising:

• a) a pump housing;
• b) an impeller attached to a drive shaft defining an axis of rotation for said impeller, said drive shaft connectable to a drive source;
• c) at least one bearing located within a bearing chamber for rotatably supporting said drive shaft;
• d) a seal assembly for inhibiting leakage of pumpage out of an impeller chamber;
• e) first and second spaced apart seals sealingly engaging said drive shaft and located intermediate said seal assembly and said bearing chamber;
• f) structure defining a region between said seals, said region communicating with a vent passage;
• and,
• g) said first seal inhibiting fluid leakage between said region and said bearing chamber, said second seal inhibiting leakage between another chamber in said pump and said region, said vent passage operative to discharge any fluid that leaks past said first and second seals.

A centrifugal pump comprising:

• a) a pump housing including at least one fluid chamber;
• b) a pump impeller connected to a drive shaft and rotatable within an impeller chamber;
• c) at least one bearing for rotatably supporting said drive shaft, said bearing located within a bearing chamber;
• d) a seal assembly associated with said impeller for inhibiting fluid leakage between said impeller chamber and said one fluid chamber;
• e) first and second, spaced apart seals sealingly engaging said shaft and located intermediate said seal assembly and said bearing chamber;
• f) said first seal associated with said bearing chamber;
• g) said second seal inhibiting fluid leakage along said shaft from said one fluid chamber;
• and,
• h) a discharge passage communicating with a region between said seals whereby any fluid that leaks past said first or second seals is discharged through said discharge passage.