WO2009119431A1 - 圧電ファン装置及びこの圧電ファン装置を用いた空冷装置 - Google Patents
圧電ファン装置及びこの圧電ファン装置を用いた空冷装置 Download PDFInfo
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- WO2009119431A1 WO2009119431A1 PCT/JP2009/055401 JP2009055401W WO2009119431A1 WO 2009119431 A1 WO2009119431 A1 WO 2009119431A1 JP 2009055401 W JP2009055401 W JP 2009055401W WO 2009119431 A1 WO2009119431 A1 WO 2009119431A1
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- piezoelectric
- fans
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- blade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D33/00—Non-positive-displacement pumps with other than pure rotation, e.g. of oscillating type
Definitions
- the present invention relates to a piezoelectric fan device that generates a wind by bending and oscillating a blade connected to the piezoelectric vibrator by bending and vibrating the piezoelectric vibrator.
- Patent Document 1 includes a piezoelectric bimorph vibrator in which a metal thin plate is sandwiched and bonded between a pair of plate-like piezoelectric elements, and an elastic thin plate is attached to both ends of the piezoelectric bimorph vibrator in a direction perpendicular to the piezoelectric bimorph vibrator.
- a piezoelectric fan having a structure in which a central portion of a vibrator is sandwiched and supported by a support portion is disclosed.
- the piezoelectric vibrators on both sides of the support part deform symmetrically.
- the left side of the support part is convexly convex upward
- the right side is also convexly upward
- the center of gravity on the left and right sides of the support part is always the same in the direction perpendicular to the piezoelectric vibrator surface.
- the reaction force generated by the vibration of the piezoelectric body is the same as the reaction force caused by the left-hand motion and the reaction force caused by the right-hand motion. It is subject to vibration of the power of.
- the support portion is very likely to vibrate, and this vibration is transmitted to other portions, which adversely affects the reliability of other components and contacts.
- this piezoelectric fan is used for the purpose of discharging warm air between a large number of radiating fins of a heat sink, the configuration of the piezoelectric fan becomes large, and the installation position is restricted.
- Patent Document 2 discloses a piezoelectric fan that discharges warm air between a large number of radiating fins of a heat sink by vibrating a wind-generating vibrator like a fan with a piezoelectric element.
- the structure is such that a wind generating plate is fixed between a pair of piezoelectric elements displaced in the opposite direction, the wind generating plate is protruded long from one end side of the piezoelectric element, and the other end side of the piezoelectric element is fixed to the case. Since it becomes (refer FIG. 2), the gravity center of the whole piezoelectric fan vibrates greatly with the vibration of a wind generating plate.
- Patent Document 3 discloses a blower in which a plurality of piezoelectric fans are supported in parallel and the phase of an alternating voltage supplied to each piezoelectric fan is alternately reversed.
- the piezoelectric fans arranged in the width direction are alternately driven in the opposite phase, the air volume can be increased as compared with the case of driving in the same phase.
- moments about three axes of the length direction axis, the width direction axis, and the thickness direction axis act on the support body supporting the plurality of piezoelectric fans.
- FIG. 13 is a diagram showing three axes in the blower related to Patent Document 3. As shown in FIG. Here, four piezoelectric fans 101 to 104 are used to simplify the explanation.
- X is a length direction axis
- Y is a width direction axis
- Z is a thickness direction axis.
- An object of the present invention is to provide a piezoelectric fan device that uses a plurality of miniaturized piezoelectric fans and can reduce vibration generated in a support portion by driving a piezoelectric vibrator.
- the present invention includes a piezoelectric vibrator that bends and vibrates when a voltage is applied, and a blade that is connected to or integrated with the piezoelectric vibrator and is excited by the piezoelectric vibrator.
- a piezoelectric fan device comprising: a plurality of piezoelectric fans arranged in parallel; and a support body for connecting and supporting in parallel the ends of the plurality of piezoelectric fans opposite to the extending side of the blade.
- the drive direction of the piezoelectric fans on both sides is axisymmetrical and the drive direction of half of the piezoelectric fans is the drive direction of the remaining half of the piezoelectric fans, with the piezoelectric fan located at the center in the width direction as the boundary.
- a piezoelectric fan device is provided, characterized in that voltage applying means for applying a voltage to each of the piezoelectric vibrators is provided so as to have an opposite phase.
- the center of gravity vibration can be canceled between the piezoelectric fans. Vibration generated in the body can be reduced. However, moments around the longitudinal axis are not canceled out, and the support vibrates, and the vibrations propagate to other parts through the support.
- the driving directions of the piezoelectric fans on both sides are axisymmetric with respect to the piezoelectric fan located at the center (in the case of odd number) or between the piezoelectric fans located in the center (in the case of even number).
- a voltage is applied to the piezoelectric vibrator so that the driving direction of half of the piezoelectric fans is in an opposite phase to the driving direction of the remaining half of the piezoelectric fans. Therefore, not only the center-of-gravity vibration generated in the support but also the moments around the three axes can be eliminated or reduced, and the rotational vibration of the support can be suppressed. Thereby, it is possible to effectively suppress the vibration of the support body caused by the vibration of the blade from spreading to the case or the like, and to realize a piezoelectric fan with low noise and high reliability.
- the vibration of the piezoelectric fan since it is possible to suppress the vibration of the piezoelectric fan from spreading to the outside, it is possible to efficiently convert the electric energy input to the piezoelectric vibrator into the vibration of the blade, thereby achieving an increase in the air volume and thus an improvement in cooling efficiency. Furthermore, since the load caused by vibration on the support is reduced, the blade can be driven with a large amplitude even if the fixing portion for fixing the support to the case or the like has low rigidity. Thereby, even if some vibration is generated in the support, the vibration can be absorbed by the vibration absorber, and the spread to the outside can be suppressed. That is, it is possible to achieve both an increase in the air volume and suppression of adverse effects caused by vibration.
- the piezoelectric fans used in the present invention have the same vibration characteristics.
- the same vibration characteristic means that the resonance frequency and the amplitude characteristic substantially match when the piezoelectric fan is vibrated alone.
- the piezoelectric fans preferably have the same shape, but with regard to the width of the blade, equivalent vibration characteristics can be obtained if the width of the piezoelectric element is also increased or decreased in accordance with the increase or decrease of the width of the blade. For this reason, if the same vibration characteristic is obtained, it is not necessary to use blades having the same width.
- the piezoelectric vibrator in the present invention is one that bends and vibrates when an AC voltage is applied, but various configurations can be employed.
- a unimorph type piezoelectric vibrator can be configured with the blade and the piezoelectric element by attaching a single-plate piezoelectric element to the main surface on one end side of the blade.
- a bimorph type piezoelectric vibrator can be configured by adhering two piezoelectric elements expanding and contracting in opposite directions to both surfaces of the blade.
- a piezoelectric vibrator may be configured by bonding a single plate piezoelectric element and a metal plate, and the blade may be fixed to the piezoelectric vibrator.
- the amplitude itself accompanying the bending vibration of the piezoelectric vibrator is very small, the amplitude of the piezoelectric vibrator can be amplified many times by the resonance of the blade connected to the piezoelectric vibrator.
- the blade may be a metal plate or a resin plate. The thickness, length, Young's modulus, etc. of the blade may be set appropriately so that the blade can perform primary resonance by vibration of the piezoelectric vibrator.
- the voltage applying means may apply voltages having opposite phases to each piezoelectric vibrator, but the polarization directions of the piezoelectric elements constituting the piezoelectric vibrator are reversed. Then, even if the voltage of the same phase is applied, it can be driven in the opposite phase.
- the number of piezoelectric fans is not limited to an even number and may be an odd number. In the case of an odd number, except for one piezoelectric fan located at the center in the width direction, the remaining half are driven in opposite phases. In the case of an odd number, the influence of the center of gravity vibration appears, but the influence decreases as the number of piezoelectric fans increases. In the case of an even number, it is particularly desirable to set a multiple of 4 such as 4, 8, or 12. In this case, since there are an even number of piezoelectric fans on both sides of the middle point in the width direction, it becomes easy to cancel the center-of-gravity vibration and the moment about the three axes.
- Each piezoelectric fan includes an elongated strip-like blade and a piezoelectric element fixed to one end portion in the length direction of the blade, and a piezoelectric vibrator is configured by the one end portion in the length direction of the blade and the piezoelectric element. It is preferable that one end of the blade in the longitudinal direction is connected to and supported by a support. In this case, since the blade is directly supported by the support, the piezoelectric element is not restrained by the support, and the piezoelectric element can be displaced more freely. Further, the structure of the piezoelectric fan is simplified, and variations in vibration characteristics of individual piezoelectric fans are less likely to occur.
- Each piezoelectric vibrator has a first vibrator and a second vibrator.
- the first vibrator and one end in the length direction of the second vibrator are connected to each other, and the first vibrator A blade is connected to the other end in the length direction, the other end in the length direction of the second vibrator is supported on the support, and the first vibrator and the second vibrator are bent in opposite directions.
- the voltage application means may be connected to do so.
- the amplitude is doubled by the two vibrators, and the blade resonates with the vibration. Therefore, the amplitude of the blade is further amplified. As a result, a significant increase in air volume can be realized.
- this piezoelectric fan device is arranged in the vicinity of a heat sink having a plurality of heat dissipating fins arranged in parallel at intervals, and each blade is arranged so that its displacement direction is parallel to the side surface of the heat dissipating fin. Insert it in between.
- the warm air existing between the radiating fins is scraped off by the bending displacement of the blade, and can be efficiently discharged in the length direction of the blade. Since each blade is isolated by the heat radiating fin, the interaction between the blades via the air can be eliminated, and an unexpected vibration mode is not generated and a load is not applied to the support.
- a plurality of piezoelectric fans are supported on the support in parallel, and the driving directions of the piezoelectric fans on both sides are axisymmetric with respect to the center in the width direction, and half of the piezoelectric fans Are driven in such a manner that their driving directions are opposite in phase to the driving directions of the remaining half of the piezoelectric fans, both the vibration of the center of gravity and the moment about the three axes are suppressed. Therefore, the amplitude of the blade is increased, the cooling efficiency is improved, and vibration propagation to other parts through the support due to the vibration is reduced. As a result, there is little adverse effect on the reliability of other parts and cases, and the noise is reduced.
- FIG. 1 is a perspective view of a first embodiment of a piezoelectric fan device according to the present invention. It is a perspective view of the drive state of the piezoelectric fan apparatus shown in FIG. It is sectional drawing of the air-cooling apparatus which combined the piezoelectric fan apparatus shown in FIG. 4 with the heat sink. It is the side view which looked at the air cooling apparatus shown in FIG. 6 from the length direction. It is a figure which shows the moment added to the support body of the piezoelectric fan apparatus shown in FIG.
- the experimental structure for comparing blade amplitude is shown, (a) is a plan view, (b) is a front view, and (c) is a right side view. It is an amplitude comparison figure of the braid
- two piezoelectric fans 1a and 1b having the same vibration characteristics are connected and fixed to the support 6 in the width direction.
- the piezoelectric fans 1a and 1b are connected to a plurality of blades 2a and 2b that can be bent and displaced in the thickness direction, and one end in the length direction of each blade 2a and 2b, and a plurality of piezoelectric vibrators 3a and 3b that bend and vibrate when a voltage is applied.
- Weights 4a and 4b are fixed to the free ends of the blades 2a and 2b, respectively.
- the piezoelectric vibrators 3a and 3b are bimorph vibrators in which piezoelectric elements are attached to both surfaces of a metal plate serving as an intermediate electrode.
- Voltage applying means 5 is electrically connected to the piezoelectric vibrators 3a and 3b, and by applying an AC voltage from the voltage applying means 5 to the piezoelectric vibrators 3a and 3b, the piezoelectric vibrators 3a and 3b are bent. By vibrating, the blades 2a and 2b can be primarily resonated to bend and displace larger than the piezoelectric vibrators 3a and 3b.
- the ends of the piezoelectric fan opposite to the extending direction of the blades 2a, 2b, here the ends of the blades 2a, 2b on the side where the piezoelectric vibrators 3a, 3b are arranged are connected and supported in parallel by the support body 6. ing.
- the support 6 is fixed to a fixing part such as a case (not shown).
- the reaction force due to the movement of the blades 2a and 2b in the opposite phase is transmitted in the width direction of the support body 6, and the reaction force cancels out. Therefore, the support body 6 is rigid enough to transmit the reaction force. is necessary.
- the voltage applying means 5 includes an AC power source 5a and wirings 5b and 5c for supplying a signal whose phase is inverted from the power source 5a to the piezoelectric vibrators 3a and 3b. That is, one end of the AC power supply 5a is connected to the upper and lower electrodes of the piezoelectric vibrator 3a and the intermediate electrode of the piezoelectric vibrator 3b via the wiring 5b, and the other end of the AC power supply 5a is connected to the piezoelectric vibrator 3a via the wiring 5c. And the upper and lower electrodes of the piezoelectric vibrator 3b. Therefore, when the free end of one piezoelectric vibrator 3a is displaced downward, the free end of the other piezoelectric vibrator 3b is displaced upward.
- the blade 2a connected to the free end of one piezoelectric vibrator 3a and the blade 2b connected to the free end of the other piezoelectric vibrator 3b are displaced in mutually opposite phases. Then, an air flow in the direction indicated by arrow A in FIG. 2 is generated. Since the vibration characteristics (length, thickness, resonance frequency, etc.) of the two piezoelectric fans 1a, 1b are the same, the vibration frequencies and amplitudes of both blades 2a, 2b are also equal. Since the weights 4a and 4b are fixed to the free ends of the blades 2a and 2b, the resonance frequency becomes lower and the amplitude becomes larger than that of the blade alone.
- z Rsin ( ⁇ sin ⁇ t)
- the amplitude in the x direction is (R / 2) sin ⁇ tan ⁇
- the amplitude in the z direction is R sin ⁇ . That is, when ⁇ is small, the amplitude in the x direction becomes a very small square, and can be ignored.
- FIG. 1 shows an example in which the piezoelectric fans 1a and 1b are fixed to the support 6 in the same direction in the thickness direction, and voltages having opposite phases are applied from the voltage applying means 5 to the piezoelectric fans 1a and 1b.
- voltages having the same phase may be applied.
- both the piezoelectric fans 1a and 1b can be vibrated in opposite phases.
- FIG. 4 to 7 show an example in which the piezoelectric fan device according to the first embodiment of the present invention is used as an air cooling device for a heat sink.
- four piezoelectric fans 10a to 10d having the same vibration characteristics are connected and fixed to the support 11 in the width direction at equal intervals.
- the piezoelectric fans 10a to 10d have the same structure as the piezoelectric fans 1a and 1b shown in FIG. That is, a plurality of blades 12a to 12d that can be bent and displaced in the thickness direction, and a plurality of bimorph piezoelectric vibrators 13a to 13d that are connected to one end in the length direction of each blade 12a to 12d and bend and vibrate when voltage is applied. Each has.
- Weights 14a to 14b are fixed to the free ends of the blades 12a to 12d, respectively.
- a voltage applying means 15 is connected to the piezoelectric vibrators 13a to 13d. By applying an AC voltage from the voltage applying means 15 to the piezoelectric vibrators 13a to 13d, the piezoelectric vibrators 13a to 13d are vibrated, and the blade 12a to 12d can resonate.
- the ends of the piezoelectric vibrators 13a to 13d opposite to the extending direction of the blades 12a to 12d are connected and supported in parallel by the support body 11.
- the voltage applying means 15 includes an AC power supply 15a and wirings 15b and 15c for applying signals whose phases are inverted from the power supply 15a to the piezoelectric vibrators 13a to 13d. That is, one end of the AC power supply 15a is connected to the upper and lower electrodes of the first and fourth piezoelectric vibrators 13a and 13d and the intermediate electrode of the second and third piezoelectric vibrators 13b and 13c via the wiring 15b. The other end of the AC power supply 15a is connected to the intermediate electrode of the first and fourth piezoelectric vibrators 13a and 13d and the upper and lower electrodes of the second and third piezoelectric vibrators 13b and 13c via the wiring 15c.
- a heat sink 20 having five heat radiation fins 21a to 21e arranged in parallel at intervals is disposed.
- the blades 12a to 12d are inserted between the radiation fins 21a to 21e, and are arranged so that the displacement direction thereof is parallel to the side surfaces of the radiation fins 21a to 21e.
- the heat sink 20 is attached in a state of being thermally coupled to the upper surface of a heating element (CPU or the like) 23 mounted on the circuit board 22. Therefore, the heat generated from the heat generating element 23 is conducted to the heat sink 20, and the air between the radiation fins 21a to 21e is heated.
- FIG. 8A is a view of the four piezoelectric fans 10a to 10d as viewed from the length direction (X direction).
- the fans 10a to 10d are driven in the directions of the arrows D1 to D4, clockwise moments are generated in the first and third piezoelectric fans 10a and 10c around the longitudinal axis (X axis), and the second and A counterclockwise moment is generated in the fourth piezoelectric fans 10b and 10d. Since these moments are the same, these moments cancel each other and the moment about the longitudinal axis becomes zero.
- FIG. 8B is a view of the piezoelectric fans 10a to 10d viewed from the width direction (Y direction). Centering on the width direction axis (Y-axis), a counterclockwise moment is generated in the first and fourth piezoelectric fans 10a and 10d, and a clockwise moment is generated in the second and third piezoelectric fans 10b and 10c. As a result, both moments cancel each other, and the moment about the width direction axis becomes zero.
- FIG. 8 is a view of the piezoelectric fans 10a to 10d viewed from the thickness direction (Z direction).
- the vibration in the longitudinal direction of each piezoelectric fan is almost negligible, and therefore the moment of each piezoelectric fan around the thickness direction axis (Z axis) is small.
- the moments acting on the first and second fans 10a and 10b and the third and fourth fans 10c and 10d are offset, so the moment about the thickness direction axis (Z-axis) becomes zero. Since all the moments around the three axes acting on the support 11 are canceled in this way, a support structure with less vibration and load can be realized.
- the torsional rigidity of the coupler satisfies the following relationship.
- D Torsional rigidity [Nm 2 / rad]
- m Mass other than fan connector [kg]
- f Drive frequency [Hz]
- L Length of fan [m]
- W Connector width [m] k: a coefficient.
- FIG. 9 shows an experimental structure for confirming the cooling performance of the piezoelectric fan device.
- Each of the four piezoelectric fans 30a to 30d includes elongated strip-like blades 31a to 31d, and one end in the longitudinal direction of these blades is fixed to one end of the holders 33a to 33d.
- Piezoelectric elements 32a to 32d are fixed in the vicinity of one end fixed to the blade holder to constitute a piezoelectric vibrator.
- the other ends of the holding tools 33a to 33d are connected to a connecting tool (support) 34 extending in the width direction.
- the connector 34 extends to one side in the width direction and is fixed to the fixing portion 35.
- the amplitude of the blade tip (when the phase of the fan 1 is 0 °) was evaluated in the case where the phase relation of vibration of each fan is four types shown in Table 1.
- the applied voltage to the piezoelectric body was fixed at 45 Vpp, and 42Ni was used as a blade, and a glass epoxy plate was used as a holder and a connector.
- two types of couplers having a thickness of 0.3 mm and 0.6 mm were used. The dimensions of each part are as shown in FIG.
- CASE 1 is an example in which all fans are driven in the same phase
- CASE 2 is an example in which the left and right halves are in reverse phase from the center
- CASE 3 is an example in which opposite phases are alternated
- CASE 4 is in the width direction This is an example in which the opposite phase is axisymmetric with respect to the center.
- FIG. 10 (a) and 10 (b) show the amplitude of the blade tip in CASE 1 to CASE 4 when the thickness of the coupler is 0.3 mm and 0.6 mm.
- CASE 2 has a larger amplitude and CASE 3 is larger than CASE 1. It can be seen that in CASE 4 that can cancel the triaxial moment, the blade amplitude is maximized.
- CASE 3 has the same situation as CASE 2, but since the distance between the fans moving in the opposite direction is smaller than CASE 2, the moment is reduced and the rotational vibration is also reduced. Therefore, if there is the same connector rigidity, a larger amplitude than CASE 2 can be obtained. In CASE4, both the center-of-gravity vibration and the moment vibration can cancel each other out in the coupler, so that a larger amplitude can be obtained compared to CASE3.
- the blade amplitude difference between CASE 3 and CASE 4 is slight when the thickness of the coupler is 0.6 mm, but the amplitude difference is about 5% at 0.3 mm.
- the amplitude difference of 5% is numerically small, there is a difference of about 15% in the cooling performance depending on the installation position of the fan with respect to the heat source. Therefore, if the rigidity of the coupler that supports the fan is reduced in order to suppress the spread of vibrations to the outside, a large difference in cooling performance occurs.
- FIG. 11 shows an example of a driving method when eight piezoelectric fans are arranged in parallel.
- First to eighth fans 41 to 48 are arranged at equal intervals in the width direction, and are connected and held by a support (not shown).
- Arrows D1 to D8 indicate the driving directions.
- the X axis is the longitudinal axis at the center in the width direction, and the Z axis is the thickness direction axis.
- the two fans 44 and 45 at the center are driven in the same phase, and the other fans are alternately driven in opposite phases with respect to adjacent fans.
- FIG. 12 shows various aspects of the structure of the piezoelectric fan.
- a piezoelectric fan 50 shown in FIG. 12A is an example in which a main surface of one end of a blade 52 made of a metal plate is attached to one main surface of a single-plate piezoelectric element 51 to form a unimorph type vibrator.
- the end of the piezoelectric fan 50 opposite to the blade protruding side is fixed to the support 53.
- the piezoelectric fan 50 as a whole is bent and deformed by the piezoelectric element 51 that expands and contracts and the blade 52 that does not expand and contract.
- one electrode of the piezoelectric element 51 can be shared by the blade 52.
- a piezoelectric fan 60 shown in FIG. 12B is an example in which piezoelectric elements 62 and 63 are attached to both principal surfaces of one end of a blade 61 made of a metal plate to form a bimorph type vibrator.
- the end of the piezoelectric fan 60 opposite to the blade protruding side is fixed to the support 64.
- the piezoelectric elements 62 and 63 are polarized in the same direction in the thickness direction, the piezoelectric fan 60 is bent and deformed as a whole by applying an AC voltage between the electrodes on both main surfaces and the blade 61.
- a piezoelectric fan 70 shown in FIG. 12C has a first vibrator 71 and a second vibrator 72, and one end in the length direction of the first vibrator 71 and the second vibrator 72. By connecting them together via a spacer 73, a U-shaped structure is formed, the blade 74 is connected to the other longitudinal end of the first vibrator 71, and the other longitudinal end of the second vibrator 72 is connected. It is supported by the support body 75.
- the first vibrator 71 and the second vibrator 72 are vibrators having the same vibration characteristics, and are bent and displaced in directions opposite to each other. For example, when the first vibrator 71 is bent and displaced convexly upward, the second vibrator 72 is bent and displaced convexly downward.
- the blade 74 is vibrated with twice the amplitude of each of the vibrators 71 and 72, and the amplitude of the blade 74 is increased accordingly, so that a significant increase in air volume can be realized.
- the piezoelectric fan 80 shown in FIG. 12D is a modification of the piezoelectric fan 70 shown in FIG. 12C, and the same components are denoted by the same reference numerals and redundant description is omitted.
- a blade 81 connected to the other longitudinal end of the first vibrator 71 is bent in a V shape.
- the two vibrators 71 and 72 have a U-shaped structure and the blade 74 is folded back toward the vibrators 71 and 72, the length dimension can be shortened, and a compact piezoelectric fan as a whole can be obtained. realizable.
- Piezoelectric fan 11 Supports 12a to 12d Blades 13a to 13d Piezoelectric vibrators 14a to 14d Weight 15 Voltage applying means 15a AC power supply
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Abstract
Description
x=Rcos(Θsin ωt)
z=Rsin(Θsin ωt)
のように書ける。ここで、x方向の振幅は(R/2)sinΘ tanΘであり、z方向の振幅はRsin Θである。すなわち、Θが小さい場合には、x方向の振幅は微少量の2乗となるので、無視できる。一方で、逆位相の振動をしているものは、
x=Rcos(-Θsin ωt) =Rcos(Θsin ωt)
z=Rsin(-Θsin ωt) =-Rsin(Θsin ωt)
となる。これら2つの圧電ファンを合わせた場合の重心は、
x=(MRcos(Θsin ωt) +MRcos(Θsin ωt))/(M+M)
=Rcos(Θsin ωt)
z=(MRsin(Θsin ωt) -MRsin(Θsin ωt))/(M+M)
=0
と計算できる。
図4~図7は本発明に係る圧電ファン装置の第1実施形態を、ヒートシンクの空冷装置として用いた例を示す。図4において、同一振動特性を持つ4個の圧電ファン10a~10dが支持体11に幅方向に並べて等間隔で連結固定されている。圧電ファン10a~10dは、図1に示した圧電ファン1a,1bと同様な構造を有する。すなわち、厚み方向に屈曲変位自在な複数のブレード12a~12dと、各ブレード12a~12dの長さ方向一端部に連結され、電圧印加により屈曲振動する複数のバイモルフ型圧電振動子13a~13dとをそれぞれ備えている。ブレード12a~12dの自由端には、それぞれ重り14a~14bが固定されている。圧電振動子13a~13dには電圧印加手段15が接続されており、この電圧印加手段15から圧電振動子13a~13dに交流電圧を印加することにより、圧電振動子13a~13dを振動させ、ブレード12a~12dを共振させることができる。圧電振動子13a~13dのブレード12a~12dの延在方向と逆側の端部が支持体11によって並列に連結支持されている。
D>kmAf2 LW
ここで、D:ねじり剛性〔Nm2 /rad〕
m:ファンの連結具以外の質量〔kg〕
A:ブレード先端の振幅(tip-to-tip)〔m〕
f:駆動周波数〔Hz〕
L:ファンの長さ〔m〕
W:連結具幅〔m〕
k:係数
である。また、3軸モーメントを打ち消す場合は、上記係数kは10以上の値があるとより振動伝播を小さくでき、他の部品やケース等の信頼性に悪影響を与えることが少なく、かつ低騒音になる。
11 支持体
12a~12d ブレード
13a~13d 圧電振動子
14a~14d 重り
15 電圧印加手段
15a 交流電源
Claims (6)
- 電圧印加により屈曲振動する圧電振動子と、当該圧電振動子に連結又は一体化されて前記圧電振動子により励振されるブレードとを有し、幅方向に並列配置された複数の圧電ファンと、
前記複数の圧電ファンにおける前記ブレードの延在側と逆側の端部を並列に連結支持する支持体と、を備えた圧電ファン装置において、
幅方向中央に位置する圧電ファン又は幅方向中央に位置する圧電ファン間を境にして、両側の圧電ファンの駆動方向が線対称で、かつ半数の圧電ファンの駆動方向が残りの半数の圧電ファンの駆動方向に対して逆位相になるように、前記各圧電振動子に電圧を印加する電圧印加手段を設けたことを特徴とする圧電ファン装置。 - 前記圧電ファンの個数は4の倍数であることを特徴とする請求項1に記載の圧電ファン装置。
- 前記圧電ファンは4個並列に配置され、中央の2個の圧電ファンは同位相で駆動され、両端の2個の圧電ファンは中央の2個の圧電ファンに対して逆位相で駆動されることを特徴とする請求項2に記載の圧電ファン装置。
- 前記各圧電ファンは、細長い帯板状のブレードと、当該ブレードの長さ方向一端部に固定された圧電素子とを含み、
前記ブレードの長さ方向一端部と前記圧電素子とで前記圧電振動子を構成しており、
前記ブレードの長さ方向一端部が前記支持体に連結支持されていることを特徴とする請求項1乃至3のいずれか1項に記載の圧電ファン装置。 - 前記各圧電振動子は第1の振動子と第2の振動子とを有し、前記第1の振動子と第2の振動子の長さ方向一端部同士を相互に連結し、第1の振動子の長さ方向他端部に前記ブレードを連結し、第2の振動子の長さ方向他端部を前記支持体に支持してなり、第1の振動子と第2の振動子とが逆向きに屈曲振動するよう電圧印加手段が接続されていることを特徴とする請求項1乃至4のいずれか1項に記載の圧電ファン装置。
- 請求項1乃至5のいずれか1項に記載の圧電ファン装置が、間隔をあけて並設された複数の放熱フィンを有するヒートシンクの近傍に配置され、前記各ブレードはその変位方向が放熱フィンの側面と平行になるように前記各放熱フィンの間に挿入されていることを特徴とする空冷装置。
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JP2010505588A JP5170238B2 (ja) | 2008-03-25 | 2009-03-19 | 圧電ファン装置及びこの圧電ファン装置を用いた空冷装置 |
US12/889,439 US20110014069A1 (en) | 2008-03-25 | 2010-09-24 | Piezoelectric fan device and air-cooling apparatus using the piezoelectric fan device |
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Also Published As
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CN101978172A (zh) | 2011-02-16 |
JP5170238B2 (ja) | 2013-03-27 |
JPWO2009119431A1 (ja) | 2011-07-21 |
US20110014069A1 (en) | 2011-01-20 |
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