초록 ▼

An absolute proportioning pumping system includes an electric motor assembly powering a first pump at a first flow rate and powering a second pump at a second flow rate. A proportioned fluid output includes a first fluid pumped by the first pump and a second fluid pumped by the second pump. The pump

An absolute proportioning pumping system includes an electric motor assembly powering a first pump at a first flow rate and powering a second pump at a second flow rate. A proportioned fluid output includes a first fluid pumped by the first pump and a second fluid pumped by the second pump. The pumping system provides a desired ratio of the first fluid to the second fluid at the proportioned fluid output, relatively independently of pressure and flow rate at the output. In accord with further embodiments, a pump and motor assembly is mounted to and generally surrounded by a liquid tank. The pump and motor assembly may include a pair of fixed ratio outputs driven from a common motor, or may include a single variable output pump either slaved to a master pump or controlled through a timed bypass valve to control output flow rate.

대표청구항 ▼

1. A system for pumping a first fluid and a second fluid in a desired proportion, the system comprising: an electric motor assembly having a first drive shaft and a second drive shaft, wherein during operation, the electric motor assembly drives the first drive shaft at a first rotational rate and t

1. A system for pumping a first fluid and a second fluid in a desired proportion, the system comprising: an electric motor assembly having a first drive shaft and a second drive shaft, wherein during operation, the electric motor assembly drives the first drive shaft at a first rotational rate and the second drive shaft at a second rotational rate;a first pump driven at a first rate by the first drive shaft;a second pump driven at a second rate by the second drive shaft;a first container for containing a first liquid, the first container in fluid communication with an inlet of the first pump;a second container for containing a second liquid, the second container in fluid communication with an inlet of the second pump;a first pressure regulating check valve having an inlet in fluid communication with and configured to operatively maintain a minimum pressure at an outlet of said first pump and having an outlet in fluid communication with said inlet of the second pump; anda proportioned output in fluid communication with an outlet of the second pump. 2. The system of claim 1, wherein the electric motor assembly includes a gear reduction assembly that drives the second drive shaft. 3. The system of claim 2, wherein the first drive shaft extends from a first end to a second opposite end of an electric motor of the electric motor assembly, and the gear reduction assembly is fixed relative to the second end of the electric motor and is driven by or relative to the first drive shaft. 4. The system of claim 3, wherein the second drive shaft is driven by the gear reduction assembly. 5. The system of claim 1, wherein the first pump is a positive displacement plunger pump that includes a plunger situated in a cylinder for pumping the first fluid, the plunger of the first pump having a diameter and a stroke length; wherein the second pump is a positive displacement plunger pump that includes a plunger situated in a cylinder for pumping the second fluid, the plunger of the second pump having a diameter and a stroke length. 6. The system of claim 5, wherein the diameter and stroke length of the second pump are the same as the first pump. 7. The system of claim 5, wherein the diameter and stroke length of the second pump are different from the first pump. 8. The system of claim 1, wherein the first pump includes a double acting simplex positive displacement pump, and the second pump includes a double acting simplex positive displacement pump. 9. The system of claim 1, wherein the first pump and the second pump are configured to have substantially the same pumping capacity if the first pump and the second pump were driven at a common rate. 10. The system of claim 1, wherein the first pump and the second pump are configured to have substantially different pumping capacities if the first pump and the second pump were driven at a common rate. 11. A system for pumping a first fluid and a second fluid in a desired proportion, the system comprising: a first pump having an inlet in fluid communication with a first container for holding a quantity of the first fluid, and an outlet;a second pump having an inlet in fluid communication with a second container for holding a quantity of the second fluid, and an outlet;an electric motor assembly for driving the first pump at a first cycling rate and the second pump at a second cycling rate;a first pressure regulating check valve having an inlet in fluid communication with and configured to operatively maintain a minimum pressure at an outlet of said first pump and having an outlet in fluid communication with said inlet of the second pump; andwherein the outlet of the second pump is in fluid communication with an outlet of the system through a check valve to prevent backflow. 12. The system of claim 11, wherein the first pump and the second pump have substantially the same pumping capacity if the first pump and the second pump were driven at a common cycling rate. 13. The system of claim 11, wherein the first pump and the second pump are configured to have substantially different pumping capacities if the first pump and the second pump were driven at a common cycling rate. 14. The system of claim 11, wherein the desired proportion of the first fluid and the second fluid is not adjustable except by removing and then replacing one or more components of the system. 15. The system of claim 11, wherein the first pump is a positive displacement plunger pump that includes a plunger situated in a cylinder for pumping the first fluid, and the second pump is a positive displacement plunger pump that includes a plunger situated in a cylinder for pumping the second fluid. 16. A method of providing an accurately proportioned liquid mixture of a first liquid and a second liquid to an applicator, the method comprising: providing a first pump having a first displacement;providing a second pump having a second displacement;actuating the first pump at a first cyclic rate by a motor, the first pump pumping the first liquid at a first fluid flow rate through a first pressure regulating check valve having an inlet in fluid communication with and configured to operatively maintain a minimum pressure at an outlet of said first pump and having an outlet in fluid communication with an inlet of the second pump;actuating the second pump at a second cyclic rate by the motor, the second pump pumping the second liquid at a second fluid flow rate and simultaneously mixing said first liquid from said first pressure regulating check valve with said second liquid;the second pump pumping the second liquid to a first fluid output line; andmixing the first liquid pumped from the first pump with the second liquid pumped within the second pump to thereby generate a proportioned output, the proportioned output having a desired ratio of the first liquid to the second liquid, wherein the proportioned output is in fluid communication with the applicator.