2006-09-17 01:55:26 · 5 answers · asked by s.aruneswaran 1 in Science & Mathematics ➔ Engineering
can it be used to create vecuum?
2006-09-20 17:12:53 · update #1
The rotary positive displacement pumps are,
gear or lobe pump,
vane pump,
peristaltic pump,
and maybe a Mazda rotary engine !
2006-09-17 05:11:26 · answer #1 · answered by cycloneweaver.com 3 · 0⤊ 0⤋
by definition or example. Any pump that rotates and displaces exactly the same amount of fluid each rotation. There can be gear pumps, screw pumps, etc but all are rotary positive displacement pumps.
The other common type is centrifugal. The difference, to help explain the first answer, is that the amount of fluid moved varies with the back pressure on the pump.
2006-09-17 08:58:10 · answer #2 · answered by Here we Go 2 · 1⤊ 0⤋
PD pumps deliver equal out put to that of input.i.e. if your suction flow is say 2lpm then the delivery also will be 2lpm. When you say rotary PD pumps the the driver and driven parts will have rotary motion in the pump. In any PD pump during suction the descharge valves are closed and during discharge the suction will be closed. Both valves will allow unidirectional flow.
Examples : Gear Pump, Screw Pump, Hellical Pumps,Perstaltic Pumps etc.
Nope,to my knowledge its not possible to create vacuum by the use of PD pumps.
2006-09-21 02:43:32 · answer #3 · answered by Mechie 2 · 0⤊ 0⤋
Because for each rotation of the screw there is an equal amout of liquid moved between each ridge of the screw.
2006-09-17 09:03:38 · answer #4 · answered by Anonymous · 0⤊ 0⤋
http://www.pumpschool.com/intro/index.htm
2006-09-19 19:48:51 · answer #5 · answered by tronary 7 · 1⤊ 0⤋