Feed control system for pumping fluids to dishwashers and the like
First Claim
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1. A feed control system for pumping a fluid having a non-linear shear rate, comprising:
- (a) a peristaltic pump;
(b) a constant torque, A.C. powered shaded pole motor for driving the pump;
(c) a variable speed, D.C. powered shaded pole motor connected to the A.C. motor, and acting as an electromagnetic brake on the A.C. motor; and
,(d) an A.C. to D.C. rectifier for supplying D.C. power to the variable speed motor;
the peristaltic pump being driven by the A.C. motor, whereby a decrease in viscosity of the fluid casuses a decrease in rotational force to the constant torque motor and a counterbalancing increase in braking power of the variable speed motor, thereby linearizing the flow of fluid to the peristaltic pump.
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Abstract
A peristaltic feed pump, driven by a shaded pole motor, is provided to feed sticky, thixotropic fluids such as soaps, detergents, rinse additives, etc., to a dishwasher, chemical reactor, and the like. The shaded pole motor comprises a constant torque, A.C. portion and a D.C. electromagnetic brake portion.
The net effect of the motor enables the fluid to be fed to the dishwasher by the pump within reasonable limits of linearity.
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Citations
20 Claims
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1. A feed control system for pumping a fluid having a non-linear shear rate, comprising:
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(a) a peristaltic pump; (b) a constant torque, A.C. powered shaded pole motor for driving the pump; (c) a variable speed, D.C. powered shaded pole motor connected to the A.C. motor, and acting as an electromagnetic brake on the A.C. motor; and
,(d) an A.C. to D.C. rectifier for supplying D.C. power to the variable speed motor;
the peristaltic pump being driven by the A.C. motor, whereby a decrease in viscosity of the fluid casuses a decrease in rotational force to the constant torque motor and a counterbalancing increase in braking power of the variable speed motor, thereby linearizing the flow of fluid to the peristaltic pump. - View Dependent Claims (3, 4, 5, 6, 7, 10, 11)
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2. A feed control system for pumping a thixotropic fluid to a dishwasher, chemical reactor, and the like, comprising:
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(a) a peristaltic pump; (b) a constant torque, A.C. powered, shaded pole motor; (c) a variable speed, D.C. powered motor connected to the constant torque motor and acting as an electromagnetic brake on the constant torque motor; and
,(d) a rectifier circuit for supplying D.C. power to the variable speed motor; the peristaltic pump being driven by the A.C. motor, whereby a decrease in viscosity of the thixotropic fluid causes a decrease in rotational force to the constant torque motor and a counterbalancing increase in braking power of the variable speed motor, thereby linearizing the flow of fluid to the pump. - View Dependent Claims (8, 9)
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12. A method for pumping a sticky fluid having a non-linear, negative shear rate, comprising:
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(a) pumping the fluid with a peristaltic pump; (b) driving the pump with a constant torque, A.C. powered motor; and
,(c) breaking the constant torque motor with a variable speed, D.C. powered motor connected to the constant torque motor, whereby, a decrease in viscosity of the fluid due to pumping causes a decrease in rotational force on the constant torque motor and a counterbalancing increase in braking power of the variable speed motor, thereby linearizing the flow of fluid to the peristaltic pump. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification