An LED lamp that includes a piezoelectric fan or synthetic jet to cool component of the lamp is disclosed.

Led light with active cooling

Briefly described, the present invention is concerned with cooling heated bodies and/or heated fluid with synthetic jet actuators in either open or closed systems. A first preferred embodiment of a cooling system of the present invention comprises a synthetic jet actuator directed to impinge directly on a heat producing (or heated) body. The synthetic jet actuator generates a synthetic jet stream comprised of cool ambient fluid that impinges on the heated surface thereby cooling this surface. As an example, the heated surface/body could be a microchip array in a microcomputer. After coming into contact with the heated surface, the fluid moves along the surface and is finally rejected to the ambient where it mixes and cools down. The synthetic jet may be incorporated into a modular unit that may be clipped on to a circuit board or other heat producing element to provide added, `ad hoc` cooling. In another configuration, a synthetic jet actuator may be positioned, relative to the heated surface, to create a synthetic jet stream to flow along the heated surface. In this embodiment, the flow would be approximately tangential to a surface of a heat producing body. This embodiment may further comprise a cyclical flow of the fluid jet, along the heated body and about a heat sink surface.

Synthetic jet actuators for cooling heated bodies and environments

https://eprints.whiterose.ac.uk/507/1/tesarv4.pdf

Annular synthetic jet used for impinging flow mass-transfer

A first embodiment of the present invention provides a vortex generator in the form of a flexible piezoelectric actuator blade disposed in a wall of a flowpath, such as an airfoil. Another embodiment provides a synthetic jet actuator in which a pair of bimorph piezoelectric plates are connected by a flexible hinge.

Synthetic jet actuators

An LED assembly is provided herein. The assembly comprises a thermally conductive housing (201), wherein a portion of said housing is equipped with a plurality of fins (203); an LED (205) disposed in said housing; and a synthetic jet actuator (207) adapted to direct a synthetic jet onto said portion of the housing.

Synthetic jet cooling system for LED module

A synthetic jet actuator, which can be micromachined if desired, generates a synthetic jet stream characterized by a series of successive vortices that can be used for effectively entraining adjacent fluid. The synthetic jet actuator can be used to bend, or vector, a jet stream from another jet actuator. Further, because the synthetic jet actuator exhibits zero net mass flux, the synthetic jet actuator can be used within a bounded volume. In structure, the synthetic jet actuator comprises a housing defining an internal chamber and having an orifice. A flexible metallized diaphragm forms a wall of the housing and can change the volume of the chamber when moved. An electrode is disposed adjacent to and spaced from the diaphragm, and an electrical bias is imposed between the metallized diaphragm and the electrode by a control system to force movement of the diaphragm. As the diaphragm moves, the volume in the internal chamber changes and vortices are ejected from the chamber through the orifice.

David J. Coe

Papers

Synthetic jet actuator and applications thereof