Fluid Injector

摘要

The present disclosure relates to fluid injection and the teachings thereof may be embodied in an injector. Some embodiments include an injector comprising: a valve with a valve body and a valve needle; an armature mechanically coupled to the valve needle for moving the valve needle away from a closing position; and a damping element. The valve needle moves in the valve body and seals the valve. The armature displaces the valve needle away from the closing position. The damping element comprises: a hydraulic chamber and a piston arranged to modify a fluid volume of the hydraulic chamber. The piston reduces the fluid volume of the hydraulic chamber when the valve needle moves away from the closing position. A flow restricting orifice hydraulically connects the hydraulic chamber to the cavity.

主权项

1. An injector comprising:
a valve with a valve body and a valve needle; an armature mechanically coupled to the valve needle for moving the valve needle away from a closing position; and a damping element; wherein the valve body extends between a fluid outlet end and a fluid inlet end along a central longitudinal axis and has a cavity, the valve needle moves in the cavity axially relative to the valve body and seals the valve when in the closing position; the armature displaces the valve needle axially away from the closing position to unseal the valve; the damping element is disposed within the cavity; and the damping element comprises:
a hydraulic chamber;a piston arranged axially movable relative to the valve body and operates to modify a fluid volume of the hydraulic chamber;the piston coupled with the valve needle to reduce the fluid volume of the hydraulic chamber when the valve needle moves away from the closing position; anda flow restricting orifice hydraulically connecting the hydraulic chamber to the cavity.