Bagless 3D Printed Ventilator

grabcad

For an innovative virus, there's an innovative ventilator! The operating principle can be seen in the diagram uploaded, where water contained in the base acts as a piston. As the moving head piece is driven up the rack by two motors, negative pressure is created in the chamber, drawing in air and oxygen through the one-way inlet valve. When the motors spin in the opposite direction and retract the head piece into the base, the air in the chamber is forced out of the outlet valve (a familiar concept seen in countless ventilator designs) into the patient's lungs. The only parts not 3D printed are the valves, DC motors, and corresponding securing screws. I aimed to make this design as straightforward as possible to print and assemble, requiring only plumbers' pipe adhesive or a solvent-based adhesive. Only the rack, motor brackets, and valves need gluing. Unfortunately, I don't have access to a 3D printer, so I can't prototype it; however, I've attached all of the design files for anyone interested to try their hand at documenting their results. The motor used is available here https://uk.rs-online.com/web/p/dc-geared-motors/8347631/, and the mounting screws are 6mm long M3 Pan Heads.