JP5130650B2 - Jet generator - Google Patents

Description

  The present invention relates to a jet generating device that generates a jet of gas and an electronic apparatus equipped with the jet generating device.

  Conventionally, an increase in the amount of heat generated from a heating element such as an IC (Integrated Circuit) associated with high performance of a PC (Personal Computer) has been a problem, and various heat radiation technologies have been proposed or commercialized. Yes. As a heat dissipation method, for example, there is a method in which a heat dissipation fin made of a metal such as aluminum is brought into contact with the IC, and heat from the IC is conducted to the fin to dissipate heat. Also, there is a method of dissipating heat by forcibly removing, for example, warm air in a PC housing by using a fan and introducing ambient low-temperature air around the heating element. Alternatively, there is a method of forcibly removing the warm air around the radiating fin by the fan while using the radiating fin and the fan together to increase the contact area between the heating element and the air with the radiating fin.

  However, in such forced convection of air by the fan, there is a problem that a temperature boundary layer on the surface of the fin occurs on the downstream side of the radiating fin, and heat from the radiating fin cannot be efficiently taken. In order to solve such a problem, for example, the temperature of the temperature boundary layer can be reduced by increasing the wind speed of the fan. However, increasing the number of rotations of the fan in order to increase the wind speed has a problem in that noise from the bearing portion of the fan or noise due to wind noise caused by the wind from the fan occurs.

On the other hand, as a method of destroying the temperature boundary layer without efficiently using a fan as a blowing means and efficiently releasing the heat from the radiating fins to the outside air, there is a method of using a diaphragm that reciprocates periodically (for example, Patent Documents). 1, 2, 3, 4). Among these devices, in particular, the devices of Patent Documents 3 and 4 are a diaphragm that spatially bisects the interior of the chamber, an elastic body that supports the diaphragm and is provided in the chamber, and a means that vibrates the diaphragm. It has. In these apparatuses, for example, when the diaphragm is displaced upward, the volume of the upper space of the chamber decreases, so that the pressure of the upper space increases. Since the upper space communicates with the outside air through the intake / exhaust port, a part of the air inside the upper space is released into the outside air due to the pressure increase in the upper space. On the other hand, at this time, since the volume of the lower space on the opposite side of the upper space across the diaphragm increases, the pressure in the lower space decreases. Since the lower space communicates with the outside air through the intake / exhaust port, a part of the outside air in the vicinity of the intake / exhaust port is drawn into the lower space due to the pressure decrease in the lower space. On the other hand, when the diaphragm is displaced downward, the volume of the upper space of the chamber increases, so that the pressure of the upper space decreases. Since the upper space communicates with the outside air through the intake / exhaust port, a part of the outside air near the intake / exhaust port is drawn into the upper space due to the pressure drop in the upper space. On the other hand, at this time, the volume of the lower space on the opposite side of the upper space across the diaphragm is conversely decreased, so that the pressure in the lower space increases. Due to the pressure increase in the lower space, part of the air inside is released into the outside air. For example, an electromagnetic drive system is used to drive the diaphragm. As described above, by reciprocating the diaphragm, the operation of discharging the air in the chamber to the outside air and the operation of sucking the outside air into the chamber are periodically repeated. The air pulsation induced by the periodic reciprocating motion of the diaphragm is blown to a heating element such as a heat radiating fin (heat sink), so that the temperature boundary layer on the surface of the radiating fin is efficiently destroyed. As a result, the radiating fin is efficiently cooled.
Japanese Unexamined Patent Publication No. 2000-223871 (FIG. 2) JP 2000-114760 A (FIG. 1) JP-A-2-213200 (FIG. 1) Japanese Patent Laid-Open No. 3-116961 (FIG. 3)

  The amount of heat generated by the recent increase in the clock frequency of ICs continues to increase. Therefore, for example, in order to destroy the temperature boundary layer formed in the vicinity of the radiating fin due to the heat generation, a larger amount of air has to be sent toward the IC and the radiating fin. In the air discharge method using a diaphragm that reciprocates periodically as described in Patent Documents 1 to 4, the discharge amount of air can be increased by increasing the amplitude of the diaphragm. However, when the amplitude of the diaphragm is increased, the vibration in the amplitude direction of the diaphragm is increased, and this vibration is transmitted to the casing of the jet flow generating device, the casing of the electronic device on which the cooling device is mounted, and the like. .

  The cause of this vibration is the vibration force generated by the reciprocating motion of the diaphragm having the weight and the driving portion of the diaphragm. In order to reduce the excitation force, it is conceivable to reduce the mass, reduce the amplitude, or reduce the frequency. However, reducing the mass is contrary to maintaining the strength of the diaphragm, and reducing the amplitude and frequency is contrary to increasing the air discharge amount of the jet flow generator to increase the cooling efficiency. Proportional to the product of plate amplitude, effective area, and frequency).

  In view of the circumstances as described above, an object of the present invention is to provide a jet generating device capable of suppressing vibrations from being transmitted to the outside of the jet generating device without reducing the gas discharge amount or without reducing the cooling capacity. The object is to provide an electronic device equipped with this.

  It is a further object of the present invention to provide a technique capable of suppressing vibrations from being transmitted to the outside of the jet flow generating device and realizing a reduction in size or thickness of the jet flow generating device.

In order to achieve the above object, a jet flow generating apparatus according to the present invention includes:
A housing having an opening and containing gas inside;
A plurality of vibrations that are attached to the housing so as to vibrate and cause the gas to be discharged as a pulsating flow through the opening by applying vibration to the gas while vibrating so as to attenuate the combined excitation force. Body,
A drive unit that drives each of the vibrators,
Each vibrating body is
A first vibrating body including an annular first diaphragm and a first elastic support member connected to an inner peripheral side of the first diaphragm and supporting the first diaphragm;
A second diaphragm annularly provided on the outer peripheral side of the first diaphragm; and an annular second elasticity connected to the outer peripheral side of the second diaphragm and supporting the second diaphragm. A second vibrating body including a support member,
The drive unit is
An annular magnet disposed between the first and second vibrating bodies;
A first coil connected to the outer peripheral side of the first diaphragm and disposed on the inner peripheral side of the magnet;
A second coil connected to the inner peripheral side of the second diaphragm and disposed on the outer peripheral side of the magnet;
The housing is
A pair of plate members arranged in the casing in the vibration direction of the second diaphragm so as to face the front and back of the second diaphragm, respectively, in a part of the outer peripheral side of the magnet;
A first region that includes an outer region of the pair of plate members and an inner region of the magnet communicating with the pair of plate members, and generates a pressure change by driving the first diaphragm;
As the opening, first and second openings for alternately discharging the gas by the pressure change in the first region;
A second region that includes an inner region of the pair of plate members sandwiched between the pair of plate members and an outer region of the magnet communicating with the pair of plate members, and generates a pressure change by driving the second diaphragm;
The openings include third and fourth openings that alternately discharge the gas by the pressure change in the second region.

  In the present invention, since vibration is generated such that the combined excitation force of the plurality of vibrating bodies is attenuated, vibration transmitted to the outside of the housing and the jet flow generating device can be suppressed. On the other hand, a plurality of vibrators are used, and even if the amplitude is increased, the combined excitation force is attenuated. Therefore, the discharge amount of the gas can be increased without decreasing the discharge amount of the gas.

  For example, the excitation force is weakened by adjusting at least one of the mass, structure, amplitude, and phase of the vibrating body. Or you may make it an excitation force weaken by arrangement | positioning of each vibrating body so that it may mention later.

  Examples of the gas include air, but are not limited thereto, and may be nitrogen, helium gas, argon gas, or other gases.

  As a drive system of the drive unit, for example, an electromagnetic action, a piezoelectric action, or an electrostatic action can be used.

  The shape of the vibrating body may not be a flat plate shape but may be a three-dimensional structure. For example, there is a structure in which side plates, ribs, and the like are attached to the diaphragm to increase rigidity. However, the shape is not limited to such a purpose, and any shape may be used. In addition, examples of the shape of the surface perpendicular to the vibration direction of the vibrating body include shapes such as a circle, an ellipse, and a square.

  In the present invention, when the number of the vibrators is n, the size, shape, and material of the vibrators are the same, and the vibrators have the same frequency, the driving unit is approximately 360 / The vibrators are driven with a phase difference of n. Thereby, the mutual excitation force is weakened. The same size, shape, and material of each vibrating body are “same” when manufactured in the mass production process of the vibrating body, and may be substantially the same to the extent that the present invention can be realized. Need not be exactly the same.

  In the present invention, each of the vibrators has at least two types that differ in at least one of size, shape, and material. Even with two or more types of vibrators, the combined excitation force can be weakened by controlling the amplitude or phase.

Since the timing of gas discharge at the first and second openings is reversed, the sound waves generated from the vicinity of the first and second openings are weakened and noise can be reduced. There may be a plurality of first openings, and there may be a plurality of second openings.
The main surfaces (surfaces perpendicular to the vibration direction) of the first diaphragm and the second diaphragm can be arranged on substantially the same plane, and the jet flow generator can be thinned.
Since the annular magnet, the first coil, and the second coil can be arranged concentrically, for example, the jet flow generator can be thinned. The magnet, the first coil, and the second coil do not necessarily have to be concentrically arranged, and are flat in a plane perpendicular to the vibration direction so that the jet flow generator can be thinned. So long as they are lined up.
Since the first and second elastic support members can also be arranged in a plane in a plane perpendicular to the vibration direction, this contributes to a reduction in the thickness of the jet flow generating device.
An airflow generated by driving the second diaphragm can be generated in a region sandwiched between the pair of plate members, and an airflow generated by vibration of the first diaphragm can be generated in a region outside the pair of plate members. That is, in the present invention, it is possible to form independent regions for generating an air flow by driving the first and second diaphragms.
Since the timing of gas discharge at the first and second openings is reversed, the sound waves generated from the vicinity of the first and second openings are weakened and noise can be reduced. Moreover, since the timing of gas discharge at the third and fourth openings is reversed, the sound waves generated from the vicinity of the third and fourth openings are weakened, and noise can be reduced. There may be a plurality of first openings, and there may be a plurality of second openings. Similarly, there may be a plurality of third openings or fourth openings.

  In the present invention, the pair of plate members is provided on the side close to the opening in the housing. Thereby, the largest pressure change can be caused in the vicinity of the opening in the housing, and the gas discharge amount can be increased as much as possible.

  A jet generating device according to another aspect of the present invention has an opening, a casing containing gas inside, and the gas is vibrated to discharge the gas as a pulsating flow through the opening. And a first vibrating body provided annularly on the outer peripheral side of the first vibrating body, and by applying vibration to the gas, the gas is discharged as a pulsating flow through the opening. And a driving unit that drives the first and second vibrating bodies so that the phases of the first and second vibrating bodies are reversed.

  In the present invention, the principal surfaces (surfaces perpendicular to the vibration direction) of the first diaphragm and the second diaphragm can be arranged on substantially the same plane, and the jet flow generator can be thinned. be able to.

  A jet flow generating device according to still another aspect of the present invention has an opening, a housing containing a gas therein, and a housing that can be vibrated in the housing so as to vibrate the gas. A gas discharge vibrator for discharging the gas as a pulsating flow through the opening, a first drive unit for driving the gas discharge vibrator, and an excitation force of the gas discharge vibrator are attenuated. And a damping vibration body that vibrates in this manner.

  In the present invention, the damping vibrating body vibrates so that the excitation force of the gas discharge vibrating body is attenuated, so that vibration transmitted to the outside of the casing and the jet flow generating device can be suppressed.

  In the present invention, the first drive unit includes a magnet and a coil that is elastically connected to the gas ejection vibrator and constitutes the damping vibrator. In the present invention, since the coil that is a part of the first drive unit constitutes the damping vibrating body, it is not necessary to provide a separate vibrating body to attenuate the excitation force of the gas discharge vibrating body, and the jet flow The generator can be reduced in size or thickness. In the case of the present invention, the natural frequency of the gas ejection vibrator is substantially the same frequency and substantially the same vibration energy as the drive frequency by the first drive unit, and has an opposite phase. The structure of the vibration system or the drive frequency may be adjusted at the design stage of the jet flow generating device. The “structure” includes concepts such as mass, shape, size, material, and air resistance.

  In the present invention, the damping vibration body is mounted outside the housing. Thereby, even if the damping vibrating body vibrates, there is no influence on the airflow generated in the housing by driving the gas ejection vibrating body. The “outside of the casing” as used herein refers to an area that does not contribute to a pressure change inside the casing for discharging gas even if the damping vibration body vibrates, and is a portion that can be seen in appearance. Is not limited.

  In this case, it is preferable that the jet flow generating device further includes a second drive unit that drives the damping vibration body. As described above, by providing the second drive unit different from the first drive unit, the vibration of the gas discharge vibrator according to the driving of the gas discharge vibrator by the first drive unit. The drive of the second drive unit may be controlled so that the force is attenuated.

  A jet flow generating device according to still another aspect of the present invention includes a plurality of casings each having an opening and containing a gas therein, and each of the casings is mounted so as to be able to vibrate. A plurality of vibrating bodies for causing the gas to be discharged as a pulsating flow through the opening by giving vibration to the gas while vibrating so as to attenuate, and each of the vibrating bodies. And a plurality of driving units for driving the motor.

  In the present invention, even when there are a plurality of housings, the vibration is transmitted so that the combined excitation force of the plurality of vibrating bodies is attenuated in the same manner as described above. . Each housing may have one opening or a plurality of openings.

  In the present invention, when the number of the vibrating bodies is 3 or more, each of the driving units is a first direction in which the vibration directions of two or more first vibrating body groups of the vibrating bodies are the same, When the first phase is the same, the vibration direction of one or more vibrating bodies other than the first vibrating body group is the first direction, and the second phase is opposite to the first phase. Each of the vibrators is driven so that The size, shape, material, and the like of the vibrating body do not necessarily have to be the same, and each vibrating body may be disposed so that the mutual excitation force is weakened, and the driving unit may drive each vibrating body.

  In the present invention, when the vibration directions of the vibrating bodies are the same, the casings are arranged in the vibration direction. Needless to say, even if all the vibration bodies have the same vibration direction, the phases of at least two vibration bodies are different. Thereby, gas can be effectively discharged toward objects, such as a heat generating body arranged one-dimensionally or two-dimensionally in a plane including a vibration direction. Alternatively, when the vibration directions of the vibrating bodies are the same, if the casings are arranged in a plane substantially perpendicular to the vibration direction, the casings may be one-dimensionally or two-dimensionally in the perpendicular plane. A gas can be discharged toward an object such as a heating element arranged.

  In the present invention, each of the casings has an engaging portion that engages with each other. As a result, the casings can be appropriately stacked or arranged in a certain plane depending on the shape and arrangement of the object such as the heating element, and heat can be effectively radiated.

  An electronic device according to the present invention has a heating element, a jet generation housing having an opening and containing gas therein, and the jet generation housing so as to be able to vibrate. A plurality of vibrators for ejecting the gas as a pulsating flow toward the heating element through the opening and driving the vibrators by applying vibration to the gas while vibrating so as to attenuate. And a drive unit.

  When there are a plurality of jet generating housings, the electronic device according to the present invention includes a heating element, a plurality of jet generating housings each having an opening and containing gas, and each of the jet generating housings. It is attached to the body so as to be able to vibrate, and the gas is vibrated so that the combined excitation force is attenuated, and thereby the gas is ejected as a pulsating flow toward the heating element through the opening. And a plurality of drive units that are provided for each of the jet flow generation cases and that drive each of the vibration bodies.

  Examples of the electronic device include a computer (in the case of a personal computer, a laptop type or a desktop type), a PDA (Personal Digital Assistance), an electronic dictionary, a camera, a display device, and an audio / visual device. Mobile phones, game machines, and other electrical appliances. Examples of the heating element include an electronic component such as an IC and a resistor, a heat radiating fin (heat sink), and the like.

  As described above, according to the present invention, it is possible to suppress the vibration from being transmitted to the outside of the jet flow generating device without reducing the gas discharge amount or the cooling capacity.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a jet generating apparatus according to a reference example . FIG. 2 is a sectional view thereof.

  The jet flow generating device 10 includes a housing 1 containing air therein. The housing 1 has, for example, a rectangular parallelepiped shape. In the housing 1, for example, two diaphragms 3a and 3b facing each other and actuators 5a and 5b for driving the diaphragms 3a and 3b are provided. The actuators 5a and 5b are disposed, for example, at the upper and lower parts of the housing 1, respectively, and drive the diaphragms 3a and 3b. Elastic support members 6 a and 6 b are attached to the peripheral portions of the diaphragms 3 a and 3 b, respectively. The elastic support members 6 a and 6 b are attached to the protruding portions 7 protruding from the inner wall of the housing 1, respectively. That is, the diaphragms 3a and 3b can vibrate with respect to the housing 1 by the elastic support members 6a and 6b. The inside of the housing 1 is separated into three chambers 11a, 11b, and 11c by the diaphragm 3a, the elastic support member 6a, the vibration plate 3b, and the elastic support member 6b.

  The chamber 11b has a larger volume than the chambers 11a and 11c. However, this configuration is not necessarily required, and all the chambers may have the same volume, or all the chambers may have different volumes.

  A plurality of openings 1 a, 1 b, 1 c, and 1 d are provided on the side surface 12 of the housing 1, each in a row. The opening 1a communicates with the chamber 11a. The openings 1b and 1c communicate with the chamber 11b, and the opening 1d communicates with the chamber 11c. By providing the openings 1a to 1d, air is discharged from the respective chambers 11a to 11c toward the heating element such as a heat sink (not shown) through the openings 1a and 1b as will be described later.

  The two upper and lower actuators 5a and 5b have the same configuration. For example, a magnet 14 magnetized in the vibration direction R of the diaphragms 3 a and 3 b is built inside the cylindrical yoke 8, and for example, a disk-shaped yoke 18 is attached to the magnet 14. The magnet 14 and the yokes 8 and 18 constitute a magnetic circuit. A coil bobbin 9 around which a coil 17 is wound enters and leaves the space between the magnet 14 and the yoke 8. That is, the actuators 5a and 5b are voice coil motors. A power supply line (not shown) is connected to the coils 17 of the actuators 5a and 5b, and this power supply line is connected to a driving IC (not shown). From this driving IC, electrical signals are supplied to the actuators 5a and 5b via the feeder lines, and the diaphragms 3a and 3b can be vibrated in the direction of arrow R, respectively.

  The housing 1 is made of, for example, resin, rubber, metal, or ceramics. Resin and rubber are easy to produce by molding and are suitable for mass production. Further, when the housing 1 is made of resin or rubber, it is possible to suppress sound generated by driving the actuators 5a and 5b, airflow sound generated by vibration of the diaphragm 3a, and the like. That is, when the housing 1 is made of resin or rubber, the attenuation rate of those sounds also increases, and noise can be suppressed. Furthermore, it can respond to weight reduction and becomes low-cost. As the metal, considering heat dissipation of the housing 1, copper or aluminum having good thermal conductivity is preferable. The elastic support member 6 is made of, for example, resin or rubber.

  The diaphragms 3a and 3b are made of, for example, resin, paper, rubber, metal, or the like. The shape of the diaphragms 3a and 3b is not limited to a flat plate shape as illustrated, and may be a cone shape such as a diaphragm mounted on a speaker. Or a three-dimensional shape may be sufficient. The planar shape of the diaphragms 3a and 3b (the shape of the surface substantially perpendicular to the vibration direction R) is not limited to the rectangle shown in FIG. 1, but is a circle, an ellipse, or a combination of a rectangle and a circle, that is, rounded corners. It can also be rectangular.

  The operation of the jet flow generating device 10 configured as described above will be described.

  When, for example, a sinusoidal AC voltage is applied to each actuator 5a and 5b, the diaphragms 3a and 3b perform sinusoidal vibration. Specifically, the diaphragms 3a and 3b are driven by the actuators 5a and 5b so as to approach each other and away from each other. Thereby, the volume in chamber 11a-11c increases / decreases. As the volumes of the chambers 11a to 11c change, the pressure of the chambers 11a to 11c changes to generate an air flow from the openings 1a to 1d as a pulsating flow. For example, when the diaphragms 3a and 3b are displaced in a direction that increases the volumes of the chambers 11a and 11c, the pressures in the chambers 11a and 11c decrease. At this time, the pressure in the chamber 11b increases. As a result, air outside the housing 1 flows into the chambers 11a and 11c through the openings 1a and 1d, and the air inside the chamber 11b is discharged to the outside of the housing 1 through the openings 1b and 1c. Conversely, when the diaphragms 3a and 3b are displaced in a direction that decreases the volume of the chamber 11b, the pressure in the chambers 11a and 11c increases. Thereby, the air in the chamber 11a and 11c is discharged outside through the openings 1a and 1b.

  When air is ejected from the openings 1a to 1d, the air pressure around the openings 1a to 1d outside the housing 1 decreases, so that the surrounding air is caught in the air discharged from the openings 1a to 1d. It is. That is, this is a synthetic jet. Such a synthetic jet is blown onto a heat generating body such as a heat sink, whereby the heat generating body can be cooled.

  Moreover, when air is ejected from the openings 1a to 1d, wind noise is generated independently of the openings 1a to 1d. This is the main cause of noise. However, in the present embodiment, the timing at which air is ejected from the openings 1a and 1d and the timing at which air is ejected from the openings 1b and 1c are alternate, that is, the phases are different by 180 degrees, so that the sound waves are weakened, Noise is reduced.

  FIG. 3 is a graph showing how the combined excitation force is attenuated when the diaphragms 3a and 3b vibrate. In FIG. 3, the solid line indicates the amplitude change of the diaphragm 3a, and the broken line indicates the amplitude change of the diaphragm 3b. This graph is a graph showing the change of each amplitude as it is in the arrangement of the diaphragms 3a and 3b shown in FIG. The superposition of the two waves is ideally zero in amplitude as indicated by the thick line. Here, the second-order time derivative of the vibration equation (Y = Asin ωt (A is amplitude, ω is angular velocity, t is time)) is an acceleration equation, and therefore is in phase with the amplitude change. There is a proportional relationship with force. Therefore, the combined excitation force is attenuated by the fact that the mutual vibrations are in opposite phases.

  In addition, sound waves are generated from the vicinity of the openings 1a to 1d at a timing when air is discharged to the outside through the openings 1a to 1d. However, the diaphragms 3a and 3b are in opposite phases, and the timing at which air is discharged from the openings 1b and 1c and the timing at which air is discharged from the openings 1a and 1d are in opposite phases. Accordingly, the sounds weaken each other and noise can be suppressed.

  Note that the unit of the vertical axis in FIG. 3 is, for example, [mm]. However, FIG. 3 is a diagram for explaining the relative amplitude change of the two diaphragms 3a and 3b, and the unit of the vertical axis may be anything. The same applies to FIGS. 8 and 9 described later.

  As described above, since the plurality of diaphragms 3a and 3b vibrate so that the mutual excitation force is weakened, the vibrations of the diaphragms 3a and 3b are transmitted to the outside of the casing 1 and the jet flow generator 10. Can be suppressed. On the other hand, a plurality of diaphragms are used, and even if the amplitude is increased, the mutual excitation force weakens, so that the discharge amount of air can be increased without decreasing the discharge amount of air.

FIG. 4 is a cross-sectional view showing a jet flow generating device according to a reference example . In the following description, the description of the same members and functions of the jet flow generating apparatus 10 according to the above embodiment will be simplified or omitted, and different points will be mainly described.

  The jet flow generator 20 is configured by laminating a first jet flow generator 120 and a second jet flow generator 220. In the first jet generator 120, a first chamber 131 a and a second chamber 131 b are formed in the housing 121 so as to be partitioned by the vibration plate 3 and the elastic support member 6. The second jet generator 220 also includes a housing 221 and has the same configuration as the first jet generator 120. The second jet generator 220 is arranged so that the first jet generator 120 is turned upside down, and is arranged so that the diaphragms 3 face each other.

  Each actuator 5 drives each diaphragm 3 so as to decrease the volumes of the chambers 131b and 231a and to increase the volumes of the chambers 131a and 231b. Each actuator 5 drives each diaphragm 3 so as to increase the volumes of chambers 131b and 231a and to decrease the volumes of chambers 131a and 231b. By such an operation, air is discharged as a pulsating flow through the openings 121a, 121b, 221a, and 221b.

  As described above, the two jet generators 120 and 220 can be used to weaken the excitation force by the diaphragm 3 and is similar to the jet generator 10 shown in FIGS. 1 and 2. An effect can be obtained.

FIG. 5 is a cross-sectional view showing a jet flow generating device according to a reference example . In this jet flow generating device 30, two jet flow generators 130 and 230 having the same configuration are arranged in opposite directions with the same vibration direction R. The jet flow generator 130 includes a housing 131, the actuator 5 is disposed in the housing 131, and has one chamber. Even with such a configuration, for example, if the diaphragms 3 approach each other and vibrate away from each other, the mutual excitation forces are weakened.

  FIG. 6 is a cross-sectional view showing a jet flow generating device according to still another embodiment. The jet flow generator 40 is configured by stacking two jet flow generators 140 and 240. The jet generator 40 and the jet generator 20 shown in FIG. 4 are different in the shape of the diaphragm 33b of the jet generator 240. As shown in FIG. 6, for example, the diaphragm 33 b is thicker than the diaphragm 33 a of the jet flow generator 140.

  As described above, even if the vibration plates 33a and 33b are different in size, shape, material, etc., if they vibrate so as to approach each other and away from each other, the combined excitation force can be attenuated. In this case, even if the vibration force after synthesis remains, it is only necessary to attenuate. Alternatively, for example, when the mass of the diaphragm 33b is larger than that of the diaphragm 33a, the combined excitation force may be substantially eliminated by making the amplitude of the diaphragm 33a larger than that of the diaphragm 33b.

  FIG. 7 is a cross-sectional view showing a jet flow generating device according to still another embodiment. The jet flow generator 50 is configured by stacking jet flow generators 150, 250, and 350 having the same configuration as the jet flow generators 120 and 220 shown in FIG. The jet generators 150 and 250 are arranged in the same direction, and the jet generator 350 is arranged in the opposite direction. FIG. 8 is a graph showing amplitude changes of the diaphragms 3a, 3b, and 3c included in the jet flow generators 150, 250, and 350, respectively. These three vibrations are out of phase by 120 °. As described above, when the number of diaphragms is n, if the vibration is performed with a phase difference of 360 / n, there is no overlapping wave. Accordingly, the excitation force is also eliminated.

  In the case of the three diaphragms 3a, 3b and 3c, they may be driven as shown in FIG. For example, if the amplitude of one vibration is 1.0, the amplitude of two vibrations having opposite phases may be 0.5 on the graph.

In order to achieve the waveform shown in the graph of FIG. 8 and 9, the shape of the diaphragm 3 a to 3 c, it is desirable size and material and the like are the same.

  FIG. 10 is a cross-sectional view showing a jet flow generating device according to still another embodiment. This jet generator 110 has a configuration in which two jet generators 120 or 220 shown in FIG. 4 are arranged in a plane perpendicular to the vibration direction R of the diaphragms 3a and 3b. The openings 121a and 121b are provided so that air flows in a direction perpendicular to the paper surface in the drawing. When the vibration plate 3a vibrates, the vibration plate 3b moves upward at the timing of moving downward. The reverse is also true. In this case, a moment is generated in the direction indicated by the arrow T in the entire jet flow generating device. As described above, the combined excitation force of the diaphragms 3a and 3b is converted into a moment, so that adverse effects on the electronic apparatus on which the flow generator is mounted can be reduced. Also, noise can be reduced. Even when the combined excitation force is converted into a moment as in the present embodiment, the combined excitation force, that is, the “vibration” force acting on the entire apparatus as a result is reduced. It shall be included when the vibration force is “damped”.

  In order to suppress the generation of the moment, as shown in FIGS. 11A and 11B, three or more jet generators 120 may be arranged side by side. For example, in FIG. 11A, the diaphragm 3b moves downward at the timing when the diaphragms 3a and 3c move upward in the drawing. When these diaphragms 3a to 3c have the same shape, size, material, etc., and when it is desired to minimize the excitation force, the combined excitation force (or amplitude) of diaphragms 3a and 3c is the same. The excitation force (or amplitude) of the diaphragm 3b may be substantially the same. In FIG. 11B, for example, if the diaphragms 3b and 3c vibrate so as to move downward at the timing when the diaphragms 3a and 3d move upward, the combined excitation force can be attenuated.

  FIG. 12 is a schematic diagram showing a form in which a plurality of jet flow generators 120 are arranged. FIG. 12A shows a form in which jet flow generators 120 are vertically stacked. That is, it is a form as shown in FIG. FIG. 12B shows a form as shown in FIG. FIG. 12C shows a configuration in which two jet generators 120 are arranged vertically and horizontally. FIG. 12D illustrates a form in which N pieces are stacked vertically. FIG. 12E shows a form in which M pieces are arranged horizontally. FIG. 12F shows a form in which N pieces are arranged vertically and M, and M pieces are arranged horizontally. Even if it is a form like these, a synthetic | combination excitation force can be attenuated by adjusting the amplitude, phase, arrangement | positioning, etc. of a diaphragm. Moreover, in this Embodiment, according to the magnitude | size and shape of a heat generating body, the jet generator 120 of the same structure can be arranged in combination suitably, and versatility becomes high.

  FIG. 13 is similar to the form shown in FIG. 12, but FIG. 13 shows a form in which a plurality of diaphragms are provided in one housing. For example, FIG. 13A shows a form as shown in FIG. In other words, this means that there are as many diaphragms as are partitioned in one housing. Even with such a configuration, the combined excitation force can be attenuated. In particular, the form shown in FIG. 13 is advantageous when the size of the heating element to be cooled is known in advance at the design stage of the jet flow generating device. As a result, there are advantages such as reduction of materials and reduction of the outer dimensions of the entire jet generating device.

  FIG. 14 is a schematic diagram showing a state in which the jet flow generating device is mounted on an electronic device. FIG. 14A shows a state where jet flow generators 60 and 70 are mounted on a housing 100 of a PC as an electronic device, for example. The jet generator 60 and the jet generator 70 are different in size and the like in the figure, but the basic structure and principle are the same as those described above. The jet generator 60 and the like have the same configuration as the jet generator 120 shown in FIG. 4, for example. As shown in FIG. 14, various arrangements are possible.

  14A to 14C, the jet generators 60 and 70 are in contact with each other (in addition, they are in contact with the jet generators 80 and 90), but FIG. 14D to FIG. ), The jet generators are separated from each other. In the case of FIG. 14D to FIG. 14F, the jet generators 60, 70 and the like are designed to weaken the excitation force via the housing 100.

  FIG. 15 is a schematic diagram showing a positional relationship between the heating element and the jet flow generator. As shown in FIGS. 15A to 15C, the heat source 95 such as a heat sink in the casing 100 of the electronic device such as a PC may be a single location. Alternatively, as shown in FIGS. 15D to 15F, there may be a case where there are a plurality of heat sources 95a, 95b and the like, and one jet generator corresponds to one heat source. Good. It should be optimally arranged in consideration of the size of the electronic equipment, the capacity and arrangement of the heat source, the size and capacity of the jet generator 60, etc. In any case, the excitation force can be attenuated. is there.

  FIG. 16 is a cross-sectional view showing an electronic device in which the housing of the electronic device and the housing of the jet flow generator are integrated. As shown in FIG. 16A, wall plates 200a, 200b, and 200c are erected from the bottom surface of the casing 200 of the electronic device. The housing 200, the wall plate 200a, and the like can be integrally formed. As shown in FIG. 16B, jet generators 130 and 135 are fixed to these wall plates 200a, 200b, and 200c. The jet generator 130 has the same configuration as the jet generators 130 and 230 shown in FIG. According to such a configuration, for example, the electronic device can be made thinner by the thickness of the casing of the jet generating device as compared with the case where the jet generating device shown in FIG. . In the present embodiment, if the diaphragm 3b moves upward at the timing when the diaphragm 3a moves downward in the figure, the combined excitation force is converted into a moment.

  FIG. 17 shows the structure of the casing 121 when, for example, the jet flow generators 120 having the casing 121 shown in FIG. 4 are stacked in multiple stages. Portions X, Y, and Z surrounded by a broken line shown in FIG. 17A are enlarged and shown in FIG. A convex portion 121 c is provided on the upper surface of the housing 121, and a concave portion 121 d is provided on the lower surface thereof. The convex part 121c and the concave part 121d are provided in the vicinity of four corners, for example, as shown in FIG. According to such a configuration, the housing 121 can be stacked in multiple stages and easily positioned by engaging the convex portion 121c and the concave portion 121d.

  The number of the convex portions 121c and the concave portions 121d may not be four on one surface of the housing 121 as shown in FIG. 18, but may be three or less, or may be five or more. In addition, for example, if there are convex portions and concave portions on all six surfaces as well as the upper surface and lower surface of the housing 121, the housing 121 can be expanded in all vertical and horizontal ranges. Accordingly, the casings 121 can be appropriately stacked according to the shape and arrangement of an object such as a heating element, or can be easily arranged in a certain plane, and heat can be effectively radiated.

  Further, the shape and size of the convex portion 121c and the concave portion 121d are not limited to the forms shown in FIGS. For example, although it is circular in FIG. 18, it may be rectangular or other shapes. Or a long rail-like convex part and a recessed part may be sufficient.

  FIG. 19 is a cross-sectional view illustrating a modified example of the housing 121 illustrated in FIG. In this example, a recess 121e is formed in the convex portion 121c, and for example, a bonding material 123 may be provided in the recess 121e. The bonding material is, for example, an adhesive. The recess 121e may be disposed on the surface of the housing 121 other than the convex part 121c and the concave part 121d.

  FIG. 20 is a cross-sectional view illustrating a state where the jet flow generating device 110 illustrated in FIG. 10 is mounted on an electronic device. In this example, the jet flow generating device 110 is attached to the bottom surface of a casing 200 of an electronic device such as a PC via a damping material 15. Thereby, it can suppress that a vibration is transmitted to the housing | casing 200 from the jet flow generator 110. FIG. The damping material 15 is preferably a material that easily absorbs vibrations and impacts, such as resin, rubber, and a low repulsion material.

  Or as shown in FIG. 21, it is good also as a floating structure supported elastically by elastic bodies 13, such as a spring and rubber | gum, with respect to the housing | casing 200 of an electronic device.

  As a floating structure, a structure as shown in FIG. 23 is a plan view of the jet flow generating device 160 shown in FIG. 22, and a cross-sectional view taken along line AA in FIG. 23 is FIG. For example, a connecting member 165 that connects the casings 121 of the two jet generators 120 is provided between the two jet generators 120 included in the jet generator 160. For example, two column members 19 are erected on the bottom surface of the casing 200 of the electronic device. The movable member 16 is supported so as to be vertically movable with respect to the column member 19 and tiltable (see FIG. 24B). That is, as shown in FIG. 24B, the movable member 16 has a structure having an elastic force in the vertical direction and the tilting direction (rotating direction) of the arrow. The movable member 16 is fixed to the connecting member 165 so that the jet flow generating device 160 does not come into contact with the housing 200, that is, the jet flow generating device 160 floats in the housing 200. The connecting member 165 may be integrally formed with each housing 121.

  For example, in FIG. 24A, two housings 121 (FIGS. 22 and 23) are in a horizontal state. When the diaphragm 3 of each jet flow generator 120 is driven, a moment is generated in the entire jet flow generation device 160 as described in the form of FIG. 10, and as shown in FIG. Tilt in the direction of rotation. However, since the jet generator 160 is floating, the vibration is not easily transmitted.

  An example of the structure of the movable member 16 is shown in FIG. For example, the movable member 16 has a structure in which a plurality of springs 16c are sandwiched between two plate members 16a and 16b. The connecting member 165 is fixed to the upper plate member 16a. Thereby, the jet flow generator 160 can move in the vertical direction and the rotational direction.

  20, FIG. 21, or FIG. 22 indicates that the effect of damping the vibration of the electronic device is large. The shape, size, and weight of the electronic device, and the shape and size of the jet generators 110 and 160 It varies depending on various factors such as weight, reciprocating direction of the diaphragm, and driving frequency.

  The present invention is not limited to the embodiment described above, and various modifications are possible.

  1 and 2, the housing 1 is simply provided with the openings 1a, 1b, etc., but the nozzles may be attached to the openings. In that case, the nozzle may be formed integrally with the housing 1.

  It is also possible to appropriately combine at least two of the characteristic portions of the forms shown in the drawings.

  Each of the above jet generating devices can also be used as means for supplying fuel for the fuel cell. Specifically, the oxygen (air) intake port of the fuel cell main body and the nozzle (or opening) of the jet flow generating device according to each of the above embodiments may be arranged to face each other. If it does in this way, the air of the jet discharged from the jet generating device will be drawn in as oxygen fuel from the inlet.

FIG. 26 is a perspective view showing a jet flow generating device according to the embodiment of the present invention . FIG. 27 is a view showing a state where the upper cover is removed from the jet generating device shown in FIG. FIG. 28 is an exploded perspective view of each component of the jet flow generating device. Further, FIG. 29 is a plan view of this jet flow generating device.

  As shown in FIGS. 26 and 27, the jet flow generating device 170 includes a casing 35, and a nozzle body 48 that is attached to the opening 35a (see FIG. 27) on the front side of the casing and discharges air in the casing 35. It has. Since the nozzle body 48 is a separate body from the housing 35, the nozzle body 48 can be integrally molded, and manufacturing becomes easy.

  As shown in FIG. 28, the housing 35 includes an upper case 36, an upper cover 36 a attached to the upper case 36, a lower case 37, and a lower cover 37 a attached to the lower case 37. Further, the gasket 54 of the second diaphragm structure 58 described later constitutes a part of the casing 35. However, the gasket 54 may be arranged in the casing so as not to be visible in appearance. . The upper case 36 and the lower case 37 have the same configuration. As shown in FIG. 28, a first diaphragm structure 45, a second diaphragm structure 55, and an annular magnet 46 that is a part of the drive unit are provided in the housing 35. The upper case 36 and the lower case 37 have a substantially rectangular shape in the horizontal plane (in the XY plane), but the shape is not limited to a rectangle and may be any shape. The front side of the upper case 36 and the lower case 37 on which the nozzle body 48 is mounted and the rear side on the opposite side have curved surfaces 36e and 37e on their inner walls, respectively. Thereby, generation | occurrence | production of the eddy of the air current in the housing | casing 35 can be suppressed, and noise can be reduced.

The first diaphragm structure 45 includes a first diaphragm 42, an annular first coil 41 connected to the outer peripheral side of the first diaphragm 42, and an inner periphery of the first diaphragm 42. And a first elastic support member 43 connected to the side. The second diaphragm structure 55 includes an annular second diaphragm 52, an annular second coil 51 connected to the inner peripheral side of the second diaphragm 52, and the second diaphragm 52. An annular second elastic support member 53 connected to the outer peripheral side and an annular gasket 54 that supports the second elastic support member 53 are configured. As shown in FIGS. 26 and 30, the gasket 54 is sandwiched between the upper case 36 and the lower case 37 and constitutes a part of the housing 35 as described above. The shapes of the main surfaces (surfaces perpendicular to the Z direction) of the first diaphragm 42 and the second diaphragm 52 are substantially rectangular, but this shape is also appropriately matched to the planar shape of the housing 35. It can be changed. The first elastic support member 43 has a bellows shape. Similarly, the second elastic support member 53 has a bellows shape.

  The “annular shape” is not limited to a circle, and may be a rectangular shape as shown in FIG. 28 or other shapes.

  31 is a sectional view taken along line BB in FIG. 29, and FIG. 32 is a sectional view taken along line CC in FIG. The magnet 46 is fitted into magnet fitting portions 36b and 37b provided at the center of the lower case 37, and is placed between the magnet placement portions 36c and 37c. As shown in FIG. 31, the first coil 41 is arranged on the inner peripheral side of the magnet 46 fitted in the magnet fitting portions 36b and 37b, and the second coil is arranged on the outer peripheral side of the magnet 46. The first and second diaphragm structures 45 and 55 are arranged so that the coil 51 is arranged. That is, in order from the inside, the first diaphragm structure 45, the magnet 46, and the second diaphragm structure 55 are arranged, and these are arranged substantially concentrically. In addition, the 1st diaphragm structure 45, the magnet 46, and the 2nd diaphragm structure 55 may not be arrange | positioned concentrically, and the center may shift | deviate.

  Pillar members 36d and 37d projecting within the housing 35 are provided at substantially the centers of the upper case 36 and the lower case 37, respectively. The first diaphragm structure 45 is supported by sandwiching and supporting a flat portion 43a provided at the center of the first elastic support member 43 between the column members 36d and 37d. Further, as described above, the gasket 54 is sandwiched between the upper case 36 and the lower case 37, and is fitted into the groove 48e formed in the center in the Z direction in the nozzle body 48 on the front side, whereby the second diaphragm The structure 55 is supported.

  As described above, in the jet flow generating device 170, the main surfaces of the first diaphragm 42 and the second vibration plate 52 can be arranged on substantially the same horizontal plane, and the jet flow generating device 170 can be thinned. Can be realized.

  Inside the magnet fitting portions 36b and 37b, air circulation portions 36f and 37f that allow air to flow in the Z direction are opened. Further, two holes 36g are provided on the inner side of the magnet fitting portion 36b and on the rear side. Similarly, two holes 37g are provided in the magnet fitting portion 37b on the rear side. These holes 36g and 37g are closed by the upper cover 36a and the lower cover 37a, respectively. Note that these holes 36g and 37g are not necessarily provided.

  The magnet 46 has, for example, two magnets 46a and 46b with a spacer 46c interposed therebetween. These magnets 46a and 46b are each magnetized in the vertical direction, and magnetized in directions that repel each other. Thus, the repulsive magnetic field is formed by the two magnets 46a and 46b facing each other, so that the magnetic flux density in the direction of flowing in the horizontal direction from the spacer 46c can be increased, and the diaphragms 42 and 52 can be increased. Can be efficiently vibrated, so that power consumption can be suppressed. The spacer 46c may be a magnetic material or a nonmagnetic material. Examples of the nonmagnetic material include resin, rubber, ceramics, or a metal of a nonmagnetic material such as aluminum. The spacer 46c is not necessarily required.

The lower case 37 is provided with a floor surface 37h in the rear half, and the front half is provided with a plate material 37i arranged at a position higher in the Z direction than the floor surface 37h. Similarly, the upper case 36 is provided with a ceiling surface 36h in the rear half, and the front half is provided with a plate 36i disposed at a position lower in the Z direction than the ceiling surface 36h. The air circulation portions 36f and 37f are formed by opening the pair of plate members 36i and 37i. The front side of the second diaphragm 52 is disposed in a region 56 sandwiched between the pair of plate members 36i and 37i, and vibrates in the region 56, while the rear side is between the floor surface 37h and the ceiling surface 36h. Vibrates in the Z direction. On the other hand, the first diaphragm 42 vibrates in the Z direction in a region on the inner peripheral side of the magnet 46. By the first diaphragm structure 45, a first upper chamber 61 including an upper region of the first diaphragm 42 and an upper region of the plate member 36i, and a first lower portion including a lower region of the plate member 36i. and the chamber 62 is Ru is formed.

The nozzle body 48 is provided with air flow paths 48a, 48b, 48c, and 48d, for example, in four stages in the Z direction, and a plurality of these flow paths 48a to 48d are provided in the X direction. Nozzle body 48, thus the housing 35 has been separate bodies, as in the above embodiments, a plurality of openings may be provided in the housing. That is, the nozzle body 48 is not provided, and a plurality of openings may be formed in the housing 35 instead of the channels 48 a to 48 d of the nozzle body 48. In this case, the nozzle body 48 is included in the concept of “housing”, and the “flow path” is included in the concept of “opening”. The first upper chamber 61 communicates with the outside of the housing 35 through a flow path 48a, and the first lower chamber 62 communicates with the outside of the housing 35 through a flow path 48d. The second upper chamber 63 communicates with the outside of the housing 35 through the flow path 48b, and the second lower chamber 64 communicates with the outside of the housing through the flow path 48c.

  Note that there are gaps between the magnet 46 and the coil 41 and between the magnet 46 and the coil 41, but air flows through the upper and lower chambers 61 and 62 through this gap. However, there is no problem because the air flow rate in the gap can be designed to be very small compared to the air flow rate through the flow paths 48a to 48d of the nozzle body 48. In some cases, a member for ensuring airtightness, for example, a member similar to the first elastic support member 43 or the like may be provided in the gap.

  In the jet flow generating device 170 configured as described above, the first diaphragm 42 and the second diaphragm 52 are driven in opposite phases. That is, current flows through the first coil 41 and the second coil 51 so that the second diaphragm 52 moves upward at the timing when the first diaphragm 42 moves downward. Thereby, the excitation force due to the movement of the first diaphragm 42 is weakened by the movement of the second diaphragm 52. It is desirable that the amplitudes of the first and second diaphragms 42 and 52 are controlled so that the excitation force becomes substantially zero.

  As shown in FIG. 31, for example, when the first diaphragm 42 moves downward and the second diaphragm 52 moves upward at that timing, the first diaphragm 42 and the second diaphragm The air in the upper chamber 63 is compressed, whereby air is discharged from the flow path 48d and the flow path 48b. At the same timing, the air in the first upper chamber 61 and the second lower chamber 64 expands, so that air flows from the flow paths 48a and 48c. Conversely, when the first diaphragm 42 moves upward and the second diaphragm 52 moves downward, air flows in from the flow path 48d and the flow path 48b and flows at the same timing. Air is discharged from the channel 48a and the channel 48c.

  Since the timing at which air is discharged from the flow paths 48a and 48c and the timing at which air is discharged from the flow paths 48b and 48d are alternating, that is, in opposite phases, noise is reduced. Further, since the first and second diaphragms 42 and 52 vibrate in opposite directions, that is, vibrate in opposite phases, the center of gravity movement of the jet flow generator 170 is reduced or the center of gravity movement is eliminated. Thereby, the vibration which generate | occur | produces in the jet flow generator 170 can be suppressed.

  Further, since the pair of plate members 36 i and 37 i are provided on the side close to the nozzle body 48 in the casing 35, the nozzles in the casing 35 are driven by driving the first and second diaphragms 42 and 52. The largest pressure change can be caused in the vicinity of the body 48 in the initial stage, and the gas discharge amount can be increased as much as possible.

FIG. 33 is a cross-sectional view showing a jet flow generating device according to a reference example . In the jet flow generating device 180, an annular elastic member 73 is connected between the diaphragm 72 and the coil 71. Reference numeral 76 denotes a magnet. The magnet 76 is a magnet in which two upper and lower magnets are integrated with each other via a spacer, like a magnet 46 shown in FIG. 31, and has a cylindrical shape, for example. The elastic member 73 may be the same material (for example, rubber or resin) as the elastic support member 74, or may be a different material. The natural frequency of the spring mass system of the diaphragm 72 (the vibration system including the diaphragm 72, the elastic member 73, and the elastic support member 74) is substantially the same as the drive frequency (the frequency of the electric signal applied to the coil 71). The structure of the vibration system (spring mass system) or the drive frequency may be adjusted so that the frequency, the antiphase, and the same vibration energy are obtained. The “structure” includes concepts such as mass, shape, size, material, air resistance, and other resistance balance.

  The jet generating device 180 configured as described above operates as shown in FIGS. 34 (A) and 34 (B). In FIG. 34A, the diaphragm 72 moves upward at a timing when the coil 71 moves downward at a certain predetermined driving frequency. In FIG. 34B, at the drive frequency, the diaphragm 72 moves downward at the timing when the coil 71 moves upward. The jet generator 180 repeats such an operation. That is, the coil 71 has a function of attenuating the excitation force generated by the vibration of the diaphragm 72. Thereby, the vibration transmitted to the exterior of the housing | casing 75 or the jet flow generator 180 can be suppressed. In addition, it is not necessary to provide a separate damping vibration body for attenuating the excitation force of the diaphragm 72, and the jet flow generator 180 can be reduced in size or thickness.

FIG. 35 is a diagram schematically showing the vibration of the spring mass system of the jet flow generating device 180. M1 indicates the diaphragm 72, and M2 indicates the coil 71. K1 indicates the elastic support member 74, and K2 indicates the elastic member 73. In this spring mass system, the force acting on M1 can be expressed as f ₁ = [1 / (2π)] (k / m) ^1/2 , and the force acting on M2 can be expressed as f ₂ = Asinωt.

FIG. 36 is a cross-sectional view showing a jet flow generating device according to a reference example . In this jet flow generator 190, a damping diaphragm 92 that attenuates the excitation force generated by the vibration of the gas ejection diaphragm 82 is mounted outside the housing 85. The “outside of the casing 85” here is an area that does not contribute to a pressure change inside the casing 85 for discharging gas even when the damping diaphragm 92 vibrates. In addition, the jet flow generator 190 includes a housing 93 that houses a damping diaphragm 92. As described above, even when “outside of the casing 85”, the damping diaphragm 92 does not necessarily have to be disposed in a portion that can be seen in appearance. In addition, an actuator 96 different from the actuator 86 for driving the gas discharge diaphragm 82 is disposed in the housing 93. The actuator 96 includes a magnet 76 and a coil 98 connected to the inner peripheral side of the damping diaphragm 92, and the damping diaphragm 92 is driven by the actuator 96. The structure (shape, size, or material) of the damping diaphragm 92 may be the same as or different from that of the gas discharge diaphragm 82. The magnet 76 can have the same structure as the magnet 76 shown in FIG. 34, but may have another structure. A driving circuit board 89 that drives the gas ejection diaphragm 82 and the damping diaphragm 92 is attached to the casing 85. From the driving circuit board 89, power supply lines connected to the respective coils 97 and 98 extend. Instead of the driving circuit board 89, a simple terminal block may be used.

  In the jet flow generating apparatus 190 configured as described above, the actuator 96 is driven so that the damping diaphragm 92 vibrates in a phase opposite to that of the diaphragm 82. Thereby, the excitation force generated by the vibration for gas discharge is weakened or canceled.

  The nozzle body 78 of the jet flow generator 190 has four stages of flow paths 78a, 78b, 78c and 78d in the vertical direction (Z direction). Has a road. A partition plate 78e is provided between the flow paths 78b and 78c. When the jet generator 190 operates, the wind direction is always reversed in the upper flow paths 78a and 78b and the lower flow paths 78c and 78d. By providing the partition plate 78e, for example, air discharged from the upper flow paths 78a and 78b is less likely to be sucked from the lower flow paths 78c and 78d, and the air is efficiently discharged. The partition plate 78e may be configured by a single plate extending in the X direction, or may be provided so as to be aligned in the X direction. Since the partition plate 78e is divided into a plurality of portions in the X direction, the partition plates 78e can be fitted between the heat radiation fins constituting the heat sink (not shown). Thereby, a jet flow generator and a heat sink can be positioned easily and correctly.

It is a perspective view which shows the jet flow generator which concerns on a reference example . It is sectional drawing of the jet flow generator shown in FIG. It is a graph showing the concept that an excitation force weakens when a diaphragm vibrates. It is sectional drawing which shows the jet flow generator which concerns on a reference example . It is sectional drawing which shows the jet flow generator which concerns on a reference example . It is sectional drawing which shows the jet flow generator which concerns on another embodiment. It is sectional drawing which shows the jet flow generator which concerns on another embodiment. It is a graph which shows the amplitude change of the diaphragm which a some jet flow generator each has. It is another graph which shows the amplitude change of the diaphragm which each of several jet flow generators has. It is sectional drawing which shows the jet flow generator which concerns on another embodiment. It is sectional drawing which each shows embodiment in the case of suppressing generation | occurrence | production of the moment which generate | occur | produces with the form of FIG. It is a schematic diagram which shows the form which arranged multiple jet flow generators. It is a schematic diagram which shows the form which has a some diaphragm in one housing | casing. It is a schematic diagram which shows the state by which the jet flow generator was mounted in the electronic device. It is a schematic diagram which shows the positional relationship of a heat generating body and a jet flow generator. It is sectional drawing which shows the electronic device with which the housing | casing of the electronic device and the housing | casing of the jet flow generator were united. The structure of the said housing | casing in the case of laminating | stacking one jet flow generator 120 which has one housing | casing shown in FIG. 4 in multistage is shown. It is the top view or bottom view of the housing | casing of the jet flow generator of FIG. 17 (A). It is sectional drawing which shows the modification of the housing | casing shown in FIG. It is sectional drawing which shows the form with which the jet flow generator shown in FIG. 10 was mounted in the electronic device. It is sectional drawing which shows another state in which the jet flow generator shown in FIG. 10 was mounted in the electronic device. It is sectional drawing which shows another state in which the jet flow generator shown in FIG. 10 was mounted in the electronic device. It is a top view which shows the jet flow generator shown in FIG. It is a side view which respectively shows the principal part of the jet flow generator shown in FIG. 21, and an electronic device. It is a side view which shows an example of the structure of a movable member. It is a perspective view which shows the jet flow generator which concerns on embodiment of this invention . FIG. 27 is a perspective view showing the jet flow generating device shown in FIG. 26 with the upper cover removed. It is a disassembled perspective view of each component of the jet flow generator shown in FIG. It is a top view of the jet flow generator shown in FIG. FIG. 27 is a perspective view showing a state where the upper case and the nozzle body are detached, which is the jet flow generating device shown in FIG. 26. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is sectional drawing which shows the jet flow generator which concerns on a reference example . It is a figure which each shows operation | movement of the jet flow generator shown in FIG. It is a figure which represents typically the vibration of the said spring mass system of the jet flow generator shown in FIG. It is sectional drawing which shows the jet flow generator which concerns on a reference example .

Explanation of symbols

1, 121, 131, 221 ... Case (Case for generating jet)
1a, 1b, 1c, 1d, 121a, 121b ... openings 3a, 3b, 3c ... diaphragm 5, 5a, 5b ... actuators 6, 6a, 6b ... elastic support members 10, 20, 30, 40, 50, 110, 160 , 170, 180, 190 ... jet generator 15 ... damping material 60, 70, 120, 130, 140, 150, 220, 240, 250, 350 ... jet generator 95, 95a, 95a ... heat source 100 ... casing 121c ... convex portion 121d ... concave portion 130 ... jet flow generator 100, 200 ... housing (housing for electronic device)

Claims (2)

A housing having an opening and containing gas inside;
A plurality of vibrations that are attached to the housing so as to vibrate and cause the gas to be discharged as a pulsating flow through the opening by applying vibration to the gas while vibrating so as to attenuate the combined excitation force. Body,
A drive unit that drives each of the vibrators,
Each vibrating body is
A first vibrating body including an annular first diaphragm and a first elastic support member connected to an inner peripheral side of the first diaphragm and supporting the first diaphragm;
A second diaphragm annularly provided on the outer peripheral side of the first diaphragm; and an annular second elasticity connected to the outer peripheral side of the second diaphragm and supporting the second diaphragm. A second vibrating body including a support member,
The drive unit is
An annular magnet disposed between the first and second vibrating bodies;
A first coil connected to the outer peripheral side of the first diaphragm and disposed on the inner peripheral side of the magnet;
A second coil connected to the inner peripheral side of the second diaphragm and disposed on the outer peripheral side of the magnet;
The housing is
A pair of plate members arranged in the casing in the vibration direction of the second diaphragm so as to face the front and back of the second diaphragm, respectively, in a part of the outer peripheral side of the magnet;
A first region that includes an outer region of the pair of plate members and an inner region of the magnet communicating with the pair of plate members, and generates a pressure change by driving the first diaphragm;
As the opening, first and second openings for alternately discharging the gas by the pressure change in the first region;
A second region that includes an inner region of the pair of plate members sandwiched between the pair of plate members and an outer region of the magnet communicating with the pair of plate members, and generates a pressure change by driving the second diaphragm;
A jet generating device having, as the opening, a third and a fourth opening for alternately discharging the gas by the pressure change in the second region . The jet generator according to claim 1 ,
The pair of plate members are provided on the side closer to the opening than the center position of the first diaphragm in the casing.

Images