Crescent dimensions in Crescent Internal Gear Pump Question
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Posted by: sdinse

04/14/2004, 14:48:59

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What characteristics of a Crescent Internal Gear Pump will be affected by changing the dimensions of the crescent on the suction side.  By this, I mean the shortening of where the end of the crescent is in relation to the point where the teeth of the two gears mesh.  If the crescent is shortened (tip of crescent looks almost squared as opposed to a taper), this would create a larger volume cavity on the suction portion of the pump.  How will this volume affect the characteristics of the pump, given that all other dimensions are the same?



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Re: Crescent dimensions in Crescent Internal Gear Pump
Re: Crescent dimensions in Crescent Internal Gear Pump -- sdinse Post Reply Top of thread Forum
Posted by: randykimball
12/20/2005, 20:11:44

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It may effect the flow of fluid as far as fluid dynamics are concerned. However, the volume of a liquid fluid pumped by a gear pump is a matter of the volume difference between the gear teeth meshed versa the teeth not meshed. You are drawing liquid into the teeth and pushing that same volume out of the teeth when meshed. Only PRM will provide a direct volume change ... or larger gears / longer gears. That said, realize that the tolerance of fit between the teeth, the ends of the gears to the chamber, and the major diameter of the teeth to the cavity will effect leakage therefore effecting volume and output pressure. As the teeth are meshed fluid will be allowed to recirculate back according to the tolerance of these fits.

Now, with a gas, .... vacuum, compression, and velocity get into the picture. In this case the shape of the crecent, ports, exhaust chamber, condition on the inside of manifolds, the vortex, tempertature of the fluid, moisture content, ... many things effect the effeciency.

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Modified by randykimball at Tue, Dec 20, 2005, 20:17:24

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