Vibration balanced synthetic jet ejector
A synthetic jet ejector is provided which comprises (a) an LED ( 119 ), (b) a heat sink ( 121 ), (c) a first synthetic jet actuator ( 111 ) equipped with a first diaphragm ( 162 ) which is adapted to vibrate such that it undergoes displacements along a first axis, and (d) a second synthetic jet actuator ( 113 ) equipped with a second diaphragm ( 163 ) which is adapted to vibrate such that it undergoes displacements in an opposite direction along said first axis from said first diaphragm.
1 . A device, comprising:
a synthetic jet actuator equipped with a first actuator and a first diaphragm; and
a vibration dampening device adapted to vibrate out of phase with the first diaphragm.
2 . The device of claim 1 , wherein said first diaphragm is adapted to vibrate such that it undergoes displacements along a first axis.
3 . The device of claim 2 , wherein the first axis is perpendicular to said first diaphragm.
4 . The device of claim 2 , wherein said second diaphragm is adapted to vibrate such that it undergoes displacements in an opposite direction along said first axis from said first diaphragm.
5 . The device of claim 1 , wherein said vibration dampening device comprises a weight which vibrates out of phase with the first diaphragm.
6 . The device of claim 5 , wherein the first diaphragm and the weight vibrate essentially in accordance with the relationship
m d v d =−m w v w
wherein m d is the mass of the diaphragm, v d is the velocity of the diaphragm, m w is the mass of the weight, and v w is the velocity of the weight.
7 . The device of claim 1 , wherein the vibration dampening device is equipped with a second diaphragm.
8 . The device of claim 1 , wherein said vibration dampening device comprises a second actuator.
9 . The device of claim 1 , further comprising a heat sink.
10 . The device of claim 9 , further comprising an LED.
11 . The device of claim 9 , wherein said synthetic jet actuator is adapted to direct a first plurality of synthetic jets across a first surface of said heat sink.
12 . The device of claim 9 , wherein said heat sink has an interior surface and an exterior surface.
13 . The device of claim 12 , wherein said heat sink is essentially annular in shape and has a plurality of fins disposed on said exterior surface.
14 . The device of claim 1 , wherein said device comprises a housing having a first passageway defined therein which is in open communication with said synthetic jet actuator and said exterior surface of said heat sink.
15 . The device of claim 1 , wherein said synthetic jet ejector is fluidically isolated from said vibration dampening device.
16 . The device of claim 14 , wherein said housing consists of no more than four parts which are molded from a thermoplastic material.
17 . The device of claim 14 , wherein said first passageway is in open communication with a first plurality of apertures.
18 . The device of claim 17 , wherein said housing has a second passageway therein which is in open communication with a second plurality of apertures.
19 . The device of claim 18 , wherein said first plurality of apertures emits a first plurality of synthetic jets, and wherein said second plurality of apertures emits a second plurality of synthetic jets.
20 . The device of claim 1 , wherein said vibration dampening device further comprises a magnet and an electrical coil.
21 . The device of claim 19 , wherein said magnet is disposed between first and second opposing springs.
22 . The device of claim 1 , further comprising an accelerometer.
23 . The device of claim 1 , further comprising a layer of a high magnetic permeability material disposed between said synthetic jet actuator and said vibration dampening device.
24 . The device of claim 8 , wherein said second actuator is equipped with a magnet, and wherein said magnetic is disposed within a high magnetic permeability gap spacer.
25 . The device of claim 24 , wherein said second actuator is further equipped with an electrical coil.
26 . A method for reducing vibrations in a synthetic jet ejector equipped with a first actuator and a first diaphragm, the method comprising:
providing a vibration dampening device; and
operating the vibration dampening device out of phase with the first diaphragm.
27 . The method of claim 26 , wherein the vibration dampening device is not a synthetic jet actuator.
28 . The method of claim 26 , wherein the vibration dampening device comprises