Pump powered by a canned electric motor having a removable stator cartridge

A pump powered by a canned motor comprising:

• a generally hollow pressure housing having a forward end and an aft end and a hollow portion;
• an end cap removably attached to said aft end of said pressure housing and in communication with the hollow portion of said pressure housing;
• a generally hollow pump housing secured to said forward end of said pressure housing, said pump housing having an inlet port and a discharge port and a hollow portion, with the hollow portion of said pump housing being in communication with the hollow portion of said pressure housing;
• a generally annular, hermetically sealed stator cartridge removably positioned in the hollow portion of said pressure housing and removably secured to said pressure housing so that a generally annular gap is formed between an inner surface of said pressure housing and an outer surface of said stator cartridge, said annular gap being in communication with the hollow portion of said pump housing adjacent to said aft end of said pressure housing and said hollow portion of said pressure housing adjacent to said forward end of said pressure housing, said annular gap defining a flow path from said ends of said pressure housing;
• energizing means for supplying electrical energy to said stator cartridge;
• a generally annular, hermetically sealed rotor operatively positioned inside said annular stator cartridge so that electrical energization of said stator will cause rotation of said rotor, said rotor having an output shaft mounted for rotation therewith and extending into said hollow portion of pump housing;
• an impeller mounted on said output shaft of said rotor for rotation therewith to create a flow of fluid from said inlet port to said outlet port of said pump housing;
• and
• bearing means for rotatably supporting said rotor.