Pump module having two impellers in series and a multiple plate housing

A pump module for moving a working liquid, the pump module comprising:

• a main body comprising a top plate, an intermediate plate, a bottom plate, an inlet, an outlet, a fluid channel, a first mounting hole and a second mounting hole, wherein the top plate comprises a first top groove, a second top groove and a third top groove, the intermediate plate comprises a first intermediate opening, a second intermediate opening, a third intermediate opening and a fourth intermediate opening, and the bottom plate comprises a first bottom groove and a second bottom groove, wherein after the top plate, the intermediate plate and the bottom plate are sequentially stacked on each other from top to bottom, the first top groove, the second top groove, the third top groove, the first intermediate opening, the second intermediate opening, the third intermediate opening, the fourth intermediate opening, the first bottom groove and the second bottom groove are in communication with each other to define the fluid channel, wherein after the working liquid is introduced into the main body through the inlet, the working liquid is transferred through the first top groove, the first intermediate opening, the first bottom groove, the second intermediate opening, the second top groove, the third intermediate opening, the second bottom groove, the fourth intermediate opening and the third top groove sequentially and outputted from the main body through the outlet, wherein the fluid channel is exposed through the first mounting hole and the second mounting hole;
• a first pump installed in the first mounting hole, and comprising a first stator and a first rotator, wherein the first stator is sealedly coupled with the first mounting hole, and the first rotator is disposed within the fluid channel to move the working liquid in the fluid channel;
• and
• a second pump installed in the second mounting hole, and comprising a second stator and a second rotator, wherein the second stator is sealedly coupled with the second mounting hole, and the second rotator is disposed within the fluid channel to move the working liquid in the fluid channel,
• wherein the working liquid in the fluid channel is transferred through the first rotator and the second rotator sequentially.