Hermetically sealed pump with non-wetted motor

A hermetically sealed pump comprising a motor, a motor housing, a gas supply port, a drive shaft, first and second rotational supports, an integrated adapter, a pump housing, a seal assembly, and an impeller, wherein:

• said motor is arranged to impart rotational movement to said drive shaft;
• said first and second rotational supports are arranged to support said drive shaft;
• said drive shaft is coupled to said impeller such that rotation of said drive shaft causes rotation of said impeller;
• said motor housing is disposed about said motor and defines a front end, a rear end, and a motor cavity;
• said pump housing is disposed about said impeller and defines a process fluid cavity;
• said integrated adapter is arranged to define an adapter cavity and to couple mechanically said rear end of said motor housing to said pump housing;
• said gas supply port is arranged to introduce pressurized gas into said adapter cavity;
• and
• said seal assembly is arranged to inhibit the passage of fluid from said process fluid cavity to said adapter cavity and to permit the passage of pressurized gas contained in said adapter cavity portion of said pressurized gas cavity to said process fluid cavity.

A hermetically sealed pump comprising a motor, a motor housing, a motor liner, a gas supply port, a drive shaft, first and second rotational supports, an integrated adapter, a pump housing, a seal assembly, and an impeller, wherein:

• said motor is arranged to impart rotational movement to said drive shaft;
• said first and second rotational supports are arranged to support said drive shaft;
• said second rotational support is accommodated by said integrated adapter;
• said drive shaft is coupled to said impeller such that rotation of said drive shaft causes rotation of said impeller;
• said motor housing is disposed about said motor and defines a front end, a rear end, and a motor cavity;
• said pump housing is disposed about said impeller and defines a process fluid cavity;
• said integrated adapter is arranged to define an adapter cavity, couple mechanically said rear end of said motor housing to said pump housing, and secure said second rotational support about an axis of rotation of said drive shaft;
• said motor liner is arranged to define a hermetically sealed barrier between an inner motor cavity and an outer motor cavity;
• said motor comprises a rotor and a stator;
• said motor liner is arranged between said rotor and said stator such that said stator is arranged in said outer motor cavity and said rotor is arranged in said inner motor cavity;
• said inner motor cavity and said adapter cavity are in fluid communication with one another and define a pressurized gas cavity;
• said gas supply port is provided in said integrated adapter and is arranged to introduce pressurized gas into said pressurized gas cavity;
• said outer motor cavity is hermetically sealed from the ambient;
• said seal assembly comprises a gas barrier seal arranged to inhibit the passage of fluid from said process fluid cavity to said adapter cavity and to permit the passage of pressurized gas contained in said adapter cavity portion of said pressurized gas cavity to said process fluid cavity;
• said integrated adapter is arranged to contain pressurized gas within said adapter cavity;
• said motor liner is arranged to contain pressurized gas within said inner motor cavity;
• said motor housing is arranged to contain pressurized gas within said outer motor cavity;
• and
• said seal assembly, said integrated adapter, said motor liner, and said motor housing define three levels of process fluid containment such that a first level of process fluid containment is defined by said seal assembly, a second level of process fluid containment is defined by said integrated adapter and said motor liner, and a third level of process fluid containment is defined by said motor housing.