Pump controller for precision pumping apparatus
First Claim
Patent Images
1. A pump for dispensing fluid, comprising:
- a multistage pump having a feed chamber and a dispensation chamber therein connected through a series of valves and motors configured to draw fluid within the respective chambers and to dispense the fluid from the pump;
a fluid reservoir for providing fluid to the feed chamber; and
a pump controller for controlling the operation of the series of valves and motors in the pump so that fluid is passed between the feed chamber and the dispensation chamber and dispensed via an outlet valve coupled to the dispensation chamber, wherein a precise amount of fluid is dispensed without a double dispense or a sputtered dispense,wherein the series of valves includes a barrier valve, andwherein the pump controller is operable to keep the barrier valve closed during the dispense stage and to move at least one of the motors to compensate for any pressure increase caused by the closure of the barrier valve.
3 Assignments
0 Petitions
Accused Products
Abstract
A pump controller and pump controlling method for dispensing a precise amount of low viscosity fluid are provided in which the problems of double dispenses and stuttered dispenses are avoided. In particular, the timing of the valves and motors in the pumping apparatus are adjusted to avoid these problems.
-
Citations
9 Claims
-
1. A pump for dispensing fluid, comprising:
-
a multistage pump having a feed chamber and a dispensation chamber therein connected through a series of valves and motors configured to draw fluid within the respective chambers and to dispense the fluid from the pump; a fluid reservoir for providing fluid to the feed chamber; and a pump controller for controlling the operation of the series of valves and motors in the pump so that fluid is passed between the feed chamber and the dispensation chamber and dispensed via an outlet valve coupled to the dispensation chamber, wherein a precise amount of fluid is dispensed without a double dispense or a sputtered dispense, wherein the series of valves includes a barrier valve, and wherein the pump controller is operable to keep the barrier valve closed during the dispense stage and to move at least one of the motors to compensate for any pressure increase caused by the closure of the barrier valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification