WM7040 DC 12V/24V High Pressure Blower replacement

[okbro]

hi,

I needed the WM7040 pressure blower in my healthcare project but i cannot find it in my place. My question is can i perhaps use ordinary high speed air blower with similar rating?

thanks

 

[dr pepper]

Without knowing what you are doing exatly its not really possible to say.
That said there is usually a way round things.
Can you tell us more what you are doing?

 

[okbro]

i am trying to make a cpap device which uses wm7040 so i wanted to buy ordinary air blower and use it by adjusting it to the same pressure level? Can anyone advice substitute for wm7040 blower with similar motor and ratings which is easy to get?

thanks

 

[dr pepper]

Ok, start by trying to find data on the blower you mentioned, then do the same with a blower you are thinking of using, you want the one your thinking of using to be the same or greater.
Sometimes they only spec the flow rate, you can work out using physics what kind of pressure you would get.
I'm not an expert with fan affinity rules, but there is quite a bit of approximation goin on.
Doesnt a Cpap require oxygen?

 

[okbro]

oxygen could/should be incorporated....but this is a just a diy...i know that rating should be matched...but i asked for some experience somebody around here in the forum....

thanks

 

[KeepItSimpleStupid]

That looks like a leaf blower. Velocity is on the order of 80-100 MPH. Somehow I don't think so.

it's my uderstanding the CPap is supposed to keep the airway open. This https://breathe.ersjournals.com/content/breathe/5/1/42.full.pdf explains it better. The simplest being constant flow at a given pressure with a relief orifice.

Do't forget the difference between absolute and gauge pressure.

 

[gophert]

A CPAP uses differential pressures on the order of 5 to 12" of WATER* greater than atmospheric pressure. Also, the fan must respond to exhale back pressure to allow the patient to exhale so the motor must slow down very quickly. That is, it must not have large rotational inertia. Accurately sizing the motor to the application is key.

About 0.15 to 0.5 psi.Think in the range of 35 watts +/-

too much power can damage lungs, sinus tissue causing collapsed lung, or cerebrospinal fluid leakage into the sinuses. It can also cause eye infections as air is pushed out from the lower eye sockets. Good luck and be safe.