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High temperature small water pump

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asimpson

Mechanical
Aug 6, 2010
300
I am trying to source supply small potible water pumps for a domestic product I am designing for mass production.

600 ml/min - 10 gal/hr
99C - 210F
3 bar 43 psi

120/230 AC supply.

The small size and reletively high pressure would suggest a solenoid pump would be ideal however the temperature blows them out of the water. Small impeller pumps can do temp. but pressure is too small and usually only come DC motor versions.

Needs to be low in cost for a domestic product. Less than $30.

There are plennty of high spec. pumps like gear and vane but they are usually quite costly.

Any help welcome?

Thanks
 
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A larger version of a direct solenoid driven diaphragm pump (aka a "buzzer pump") of the sort used in espresso machines and the like, might work- if it will withstand the temperature. Some of them might handle the temperature. It's your only chance of getting that kind of pressure at that flow out of anything for $30 or anything close to that.
 
Problem with those solenoid pumps, "buzzer pumps" is they depend on the cooling effect of the water which goes through the axis of the coil. With boiling water coil wouldn't last more than a few seconds.


I saw some small diaphram pumps which use rotary motor to oscillate diaphram. Most of these use DC motors which I hoped to avoid. AC motors seem to be much bigger (over 100W)

 
If the buzzer pump won't work, you either need to significantly increase your budget or compromise on your specs. Your combination of pressure, flow and temperature required is significant, requiring a PD pump such as a diaphragm pump but with materials which will survive the combination of heat and pressure. Such a pump requires lots of parts- parts which add up rapidly in cost and which also represent a reliability issue over time.

A direct motor-driven diaphragm pump may be possible (for more money), but the diaphragm will need to be quite stout to withstand your combination of P and T. A cheap rubber diaphragm won't likely do it for you over the long term. And the reason they use DC motors is the torque required, which is substantial- you either need a DC motor or a large gear reduction or both.
 
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