CPC G01N 30/28 (2013.01) [G01N 2030/027 (2013.01); G01N 2030/326 (2013.01); G01N 2030/328 (2013.01)] | 22 Claims |
1. A metering pump, comprising:
a pump housing having an axial bore and a slot parallel to an axis of the axial bore;
a drive nut having a bore with internal threads and having an opening, the drive nut disposed in the axial bore of the pump housing;
an anti-rotation guide pin at least partially disposed in the opening of the drive nut and extending into the slot of the pump housing;
a lead screw having a threaded outer surface in engagement with the threaded bore of the drive nut;
a pusher element secured to the drive nut and having a convex surface; and
a plunger having an end in contact with the convex surface of the pusher element,
wherein a rotation of the lead screw imparts an axial translation to the drive nut, pusher element and plunger.
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