FLUID CHANNEL FLOW DISRUPTION

摘要

An injection molding apparatus including an actuator interconnected to a rod or valve pin having a smooth continuous cylindrical outer surface and one or more discontinuous or relieved or relieved portions formed as discontinuities in the cylindrical outer surface and adapted to be disposed within a fluid flow channel, the one or more discontinuous or relieved portions being configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.

主权项

1. An injection molding apparatus comprising an injection molding machine, a manifold that receives injection fluid from the machine and routes the injection fluid through a distribution channel from an upstream end toward a downstream end of a fluid flow channel that is disposed in the manifold or a nozzle communicating with the distribution channel of the manifold,
the fluid flow channel having a channel length and having a generally straight channel section extending a downstream portion of the channel length along which the injection fluid flows from the distribution channel through the fluid flow channel to a gate to a mold cavity, the fluid flow channel mating at the downstream end with the gate to the cavity, the apparatus including an actuator interconnected to a rod or pin having an axis having an axial length, the actuator and the rod or pin being adapted to enable the pin or rod to be mounted such that that the rod or pin is disposed and drivable by the actuator reciprocally through a path of upstream downstream travel within the fluid flow channel wherein the pin or rod is drivable to a downstream-most position where a distal tip end of the pin or rod closes the gate off from flow of injection fluid through the gate, the rod or pin having a smooth continuous cylindrical outer surface, the rod or pin including one or more discontinuous or relieved or relieved portions formed as discontinuities in the cylindrical outer surface, the one or more discontinuous or relieved portions extending axially along one or more selected portions of the axial length of the rod or pin, the actuator and the rod or pin being adapted to mount the rod or pin such that the rod or pin is prevented from rotating around the axis of the rod or pin, the actuator and the rod or pin being adapted to mount the rod or pin such that the one or more discontinuous or relieved portions are disposed within the fluid flow channel, the one or more discontinuous or relieved portions being configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions disposed in the straight section is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.