SYSTEMS AND METHODS TO PRECISELY CONTROL OUTPUT PRESSURE IN BUFFERED SPRAYERS (DuO1)

摘要

Dispensing devices can include buffers. This obviates the need for continually pumping the device to dispense spray or foam. A buffer can be spring loaded, spring loaded combination, elastomeric or gas, and can be in line or adjacent to a piston chamber. Such sprayers and foamers can be mounted upside down. With a buffer, a piston chamber can deliver a greater amount of liquid per unit time than can be dispensed through the nozzle(s). The fraction of liquid that cannot be dispensed can be sent to the buffer for dispensing after the piston downstroke has completed. Volume of the piston chamber and buffer, pressure response of the buffer, throughput of the nozzle, and the minimum opening pressure of the outlet valve can be arranged to restrict the outlet pressures of liquid droplets exiting the nozzle within a defined range.

主权项

1. A liquid dispensing device, comprising:
a dispensing head, comprising:
an inlet valve,a piston and a piston chamber,an actuator for controlling the piston,a buffer in fluid communication with the piston chamber,an outlet valve having a defined minimum opening pressure in fluid communication with one of (i) the buffer and (ii) the buffer and the piston chamber;anda nozzle with a defined throughput in fluid communication with the outlet valve, wherein a volume of the piston chamber, a volume of the buffer, a pressure response of the buffer, the throughput of the nozzle, and the minimum opening pressure of the outlet valve are arranged to restrict the outlet pressures of liquid droplets exiting the nozzle within a defined range.