Droplet ejection device

摘要

A droplet ejection device includes a pressure chamber; a nozzle orifice arranged in fluid connection with the pressure chamber; an actuator system for generating a pressure wave in a liquid present in the pressure chamber; and an obstruction member arranged in the pressure chamber in a position opposite to the nozzle orifice. The obstruction member comprises a first surface facing the nozzle orifice and rigidly coupled to a wall of the pressure chamber via a support. The support is arranged near the first surface of the obstruction member. The droplet ejection device according to the present invention may further comprise a structured nozzle inflow means which provides a gradual transition from the hollow shaped liquid passage to the nozzle orifice. The droplet ejection device prevents or at least mitigates air entrapment in dead volumes present in the interior of the droplet ejection device.

主权项

1. A droplet ejection device, comprising:
a pressure chamber; a nozzle orifice arranged in fluid connection with the pressure chamber; an actuator system configured to generate a pressure wave in a liquid present in the pressure chamber; and an obstruction member arranged in the pressure chamber in a position opposite to the nozzle orifice, wherein the obstruction member comprises a first surface facing the nozzle orifice, wherein the obstruction member is rigidly coupled to a wall of the pressure chamber via a support, the support being arranged near the first surface of the obstruction member, and wherein the support comprises at least one supporting member located between and attached to an inner wall of the pressure chamber and an outer surface of the obstruction member.