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/diy/ - Do It Yourself

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451180 No.451180 [Reply] [Original]

Hey /diy/ers i'm here to request your assistance
i'm building a project that requires a water pump (9 to 12VDC) and i am thinking about building it myself
i found a few videos and tutorials on how to build, which led me to building a prototype that is functional, but doesn't have enough strength for what i want
Can you give me any tips to increase the efficiency?
pic semi-related

>> No.451183

What motor are you using?

>> No.451189

>>451180
>doesn't have enough strength for what i want

What do you want it to do?

>> No.451253

>>451180
>Decrease resistance
>make the intake smaller and the output bigger
>get a better motor and add a capacitator to it

>> No.451269

>>451183
Right now a 5VDC, but i will change it for a 9VDC or a 12VDC

>>451189
it's for a boat, it will push the water, make it circulate trough a system that will analyze it's PH OD temperature and disolved solids, and then retrieve back to the river, burt when the boat is at high speeds it will push the water against the pump because of the venturi effect, i belive it will need about 0.4bar

>>451253
Thank you, but shouldn't the input be almost the same size as the output, decreasing the hydrodynamic resistance?

>> No.451278

Try an waterpump from a car (headlight cleaning or windscreen washers)... It have 12V... Easy to find on an trash yard... It is attached to the water tank of a car (normally) ;-)

>> No.451296
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451296

i would use 12V dc and pick up a starter motor from a car
and if its too low on rpm you can put a chain or belt to gear it.

>> No.451364
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451364

>>451278
that is a good idea, and i have thought about that as well, but i fear the pump would heat too much because it isn't designed to work for 1 hour nonstop, and it is designed to work with something like 30 or 40 amps if i'm not mistaken, which a regular battery can't provide but maby i will run some tests

>>451296
i forgot to say it is a RC boat, so the weight does matter

>> No.451369

Why don't you just install a scoop to retrieve water at high speeds.

Low speeds will still use the pump.

>> No.451705

>>451369
>scoop
because the boat is remotely controlled and i don't want to buy a midget to do the scooping

>> No.451736

Position the input pipe forwards so the movement pushes the water in to the pump?

>> No.451781

>>451180

i think you are utterly wasting your time making a pump when so many are available for so cheap. there is a LOT of subtle engineering and material engineering and design in a 'simple' pump.

especially centrfugal types, seriously, you could not have picked a pump type with more subtlety.

if you would tell us what the application is you'd get better suggestions and insights than this guessing game we're playing.

>> No.451782

>>451180

just go buy a 12V pump for an RV (recreational vehicle) drinking water system. they're under $20, sanitary and sealed, draw about an amp, will lift 36" of head, deliver a few GPM, etc. you can throttle them down (PWM or a series resistor i suppose) if necessary.

>> No.451790
File: 19 KB, 400x400, drill-powered-pump-1441-p.jpg [View same] [iqdb] [saucenao] [google]
451790

>>451180
Go to your local princess auto, they will have various water pumps for ponds, fountains etc.

Alternatively you can also get an aquarium water pump and modify it to fit your needs.

Or one of these pictured and find a way to attach it to a brushless motor.

>> No.452408

>>451180

buy a cheap water pump at a junk yard. shouldn't be more that a few bucks.

>> No.452561

>>451364
30 to 40 amps?

no.

wouldn't be more than 5 amps.