screw compressor - Rev B

Attempt to use a 3D printed screw compressor as ventilator to fight Covid-19.

I was thinking about a ventilator that is controlled by the patients themselve. So good, high grade ventilators can be used for the critical cases, while mild ones use this one. Or maybe even use it at home?!? As an assistent for breathing. Instead of an ambu bag.

But thats just me thinking. I have no medical background and absolutely no experience in medical ventilation. I am just an engineer trying a different approach to a problem.

My design is open source. If you see potential, use it and adapt it to your needs.

Here is a video of the compressor design:
https://youtu.be/tTnprEpED4w

Here is a video of me testing my design:
https://youtu.be/5IAoiMQRYCs

Here are the Fusion 360 files:
https://a360.co/3b4nH3q

Here are the codes for the arduino:
https://github.com/MlePh/3D-printed-screw-compressor

With exeption of the gears, all parts can be printed with standard settings. Gears with 100% infill. No support needed.

I used PETG. But PLA could also work.

Parts needed for the compressor:

• 5 pcs 608Z ball bearing (used for inlineskates - very common size)
• 2 pcs 8mm rods (steel, aluminium, cfk,...) -> cut to 130mm length
• 7 pcs M3x30 screws
• 10 pcs M3x10 screws
• 2 pcs potentiometers brushless DC motor (i used a MultiStar 2216-800kV motor)
• ESC for the DC motor
• arduino nano 5V BEC (if the ESC doesn't provide 5V power)
• DC power source with more then 12V (i used a 4S lipo battery)

If the screws have to much friction inside the cylinder, you may have to sand it. To do that, i designed a grinding tool, that fits the inner diameter of the two cylinders.

Parts needed for the grinding tool:

• sand paper (400), cut to 20mm stripes
• M10 threaded rod with two screw nuts
• 4 pcs M3x10 screws