Refrigerant forced in close circuit between the motor casing and the external cooling jacket secured by a centrifugal impeller direct connected on the shaft.
The refrigerant fluid is forced between the external pump body and the cooling jacket by one auxiliary impeller directly coupled on the main pump shaft (1).
The working principle do permit to cool the motor by a forced feed lubrication system.
Aspecific intermediate disk is mounted in the oil chamber (2). By this mean we have in the lower part a suction side (3) and in the upper part of the disk the discharge side (4). The fluid is cooled by the transfer of heat to the seal-housing (5). The refrigerant fluid is than pumped through four channels in the intermediate cooling chamber (6) existing between the external pump body and the motor toward the upper part of the pump.
The return circuit of the fluid towards the down-part of the disk in the oil chamber is done by four stainless steel tubing (7) located inside to the interference space enclosed between the external pump body and the outside stainless steel jacket of the pump.