DROPLETS FORMING METHOD AND DEVICE FOR DISCHARGING CONSTANT-VOLUME DROPLETS

摘要

A phenomenon of sucking air via a discharge port in a nozzle tip end that occurs when a plunger rod (8) retracts away from a valve seat is prevented. A method or device of discharging droplets by sending pressure-regulated liquid or liquid stored in a container, as required, flying in droplets from the valve's discharge port (6), wherein a liquid supply amount is so controlled as to follow up a difference in pressure between the discharge port (6) and a flow passage in the valve body (1) to thereby prevent bubbles from being mixed into via the discharge port (6). Droplets are continuously discharged at a high tact. A plunger rod (8) retracted by an air pressure opens the discharge port, and the plunger rod (8) advanced by the resilient force of a spring (9) discharges droplets via the discharge port. The retracting speed of the plunger rod (8) is so controlled by an air flow rate as to prevent bubbles from being mixed into via the discharge port when the plunger rod (8) retracts.