CN100430599C - Device for generating a medium stream - Google Patents
Device for generating a medium stream Download PDFInfo
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- CN100430599C CN100430599C CNB2004800183399A CN200480018339A CN100430599C CN 100430599 C CN100430599 C CN 100430599C CN B2004800183399 A CNB2004800183399 A CN B2004800183399A CN 200480018339 A CN200480018339 A CN 200480018339A CN 100430599 C CN100430599 C CN 100430599C
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/02—Loudspeakers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
- F04B43/043—Micropumps
- F04B43/046—Micropumps with piezoelectric drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
- F04B43/09—Pumps having electric drive
- F04B43/095—Piezo-electric drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/14—Machines, pumps, or pumping installations having flexible working members having peristaltic action having plate-like flexible members
Abstract
The invention relates to a device (1) for generating a medium stream, having a chamber (4), which chamber (4) comprises chamber walls (2, 3) lying opposite one another and at least one medium opening (27, 28, 29, 30) for the medium stream, which medium stream can be generated in the chamber (4) by means of a diaphragm (5), which diaphragm (5), in an inactive operating state of the device (1), is arranged substantially untensioned in the chamber (4) between the chamber walls (2, 3) lying opposite one another, and associated with which diaphragm (5) is a drive device (6), responsive to electrical drive signals, for driving the diaphragm (5) to deform the same, the drive device (6) being designed to impose a deformation on the diaphragm (5) in an active operating state of the device (1), during which deformation the diaphragm (5) has an inner mechanical tension.
Description
Technical field
The present invention relates to be used to produce the equipment of MEDIA FLOW, this equipment comprises chamber, at least one medium holes that described chamber comprises chamber wall respect to one another and is used for MEDIA FLOW, and be equipped with diaphragm means, this diaphragm means is arranged to and is configured for produce MEDIA FLOW.
Background technique
Known from american documentation literature 2002/0146333A have a kind of like this equipment that adopts the pump form, this pump is used to produce the MEDIA FLOW of pumping, and utilize this pump, be similar to progressive wave or row wave deformation by vibrating diaphragm, one side can be with the another side that is pumped to chamber of flowing medium from chamber.Under the situation of this known device, the loose deformable vibrating diaphragm fixing at two ends has the gradient thickness of qualification, and by such as piezoelectric element or magnetic systems with flowing medium from vibrating diaphragm relatively thicker chamber stub area be transferred to the chamber opposite end of vibrating diaphragm thickness minimum, and cause vibrating diaphragm to vibrate in the fluctuation mode.Therefore the waveform that causes on the vibrating diaphragm does not belong to the forced vibration with adjustable gait of march and adjustable frequency corresponding to the eigen mode of vibrating diaphragm.As mentioned, at the inlet end of vibrating diaphragm vibrating diaphragm carried out this excitation, and, must produce great damping by the fluid of transmission in order to produce capable ripple; In order to realize the high efficiency of transmission of fluid, must keep energizing frequency lower, for example be in 40Hz in the scope of 80Hz.Under the situation of this known device, on the one hand, in relatively large mobility scale, be difficult to realize different flow velocitys, on the other hand, also can not realize miniaturization.In addition, known device is not suitable for the high efficiency of transmission of gas medium, in default of the desired damping function of vibrating diaphragm natural resonance.
Yet the miniaturization transmission equipment that is used for gas medium in the future may become more and more important, especially when considering flow velocity is carried out accurate measurement or accurately adjusts and rapidly during switching, for example, distributing under the situation of odoring substance.Therefore, especially in order to transmit and to send gas medium, still there is production demand to the equipment that is used to produce MEDIA FLOW with the amount of accurate measurement; And can realize this equipment with the structure of miniaturization.
On the other hand, for example, known from patent documentation DE 4041544A, in having the electrostatic loudspeaker of a plurality of fixed electrode, the guiding vibrating diaphragm moves and has adopted around the crooked to and fro mode of a plurality of fixed electrode, so that obtain bigger loudspeaker action face in this way, and the vibration area of bigger per unit area loudspeaker.The bending of vibrating diaphragm be provided with the single vibrating diaphragm part that produced as in the conventional electrostatic loudspeaker tensioning, and be positioned at by separately relative chamber wall and formed and have in the chamber of phonate hole.No matter the bending setting of vibrating diaphragm how, with the single vibrating diaphragm of same size Comparatively speaking, almost do not increase movably volume of air, so will keep lower acoustic pressure.Especially, movably the volume of air ratio long-pending with respect to overall product can only reach relatively low value.And this known structure do not have capable of miniaturization, and it is essential therefore improving the mobile volume of air of vibration vibrating diaphragm and the ratio between the total volume.In addition, high offset voltage foot is essential, and is not having under the situation of offset voltage, can not adopt the operation loudspeaker with desirable parameter.
Therefore, as loudspeaker be used to produce under the situation of equipment of MEDIA FLOW, have demand, in this model to a kind of model, but the needed high useful volume long-pending of implementation structure (that is big volume of air that is moved by vibrating diaphragm) with respect to outfit of equipment; In addition, it all is essential not having the modular construction of power loss and the miniaturization of equipment.
Summary of the invention
As described in introductory song, the purpose of this invention is to provide a kind of equipment that is used to produce MEDIA FLOW, in this equipment, can accurately limit with rapid adjustable metering and produce MEDIA FLOW, any required frequency that wherein is used for the vibrating diaphragm distortion all should be possible; Parts come structure equipment but also can utilize still less, and this equipment should be able to be used for miniaturization structure, for example the loudspeaker of using as the mobile phone handheld device.
Therefore,, the invention provides a kind of equipment that is used to produce MEDIA FLOW, it is characterized in that following mode, that is: according to main aspect
A kind of equipment that is used to produce MEDIA FLOW, this equipment comprises chamber, described chamber comprises is arranged to chamber wall respect to one another and at least one is used for the medium holes of MEDIA FLOW, and be equipped with diaphragm means, this diaphragm means is arranged to and is configured for produce MEDIA FLOW, when equipment is in inactive serviceability, diaphragm means loosely is arranged in the chamber and between chamber wall basically, diaphragm means has the drive unit that is used for driving in response to electric drive signal diaphragm means that is associated with it, wherein diaphragm means deforms, when equipment is in movable serviceability, drive unit is arranged to force distortion on diaphragm means, in this deformation process, diaphragm means has mechanical internal tension, and wherein said equipment is arranged for the MEDIA FLOW of passing through to be produced and produces sound.
Great advantages according to equipment of the present invention is, the drive unit that is used to drive diaphragm means preferably is located at roughly whole (effectively) length of diaphragm means and/or chamber, is effective on roughly whole (effectively) length of diaphragm means and/or chamber perhaps.
Therefore, in the activity operations state according to present device, diaphragm means or vibrating diaphragm be not (or needn't) work when being in eigen mode, and can carry out the excitation or the driving of vibrating diaphragm on whole vibrating diaphragm zone, in this case, can realize relative uniform performance.Realize the driving of diaphragm means by the distortion that causes diaphragm means, therefore, diaphragm means has or has produced the tool internal tension afterwards, and thereby give the diaphragm means certain mechanical strength, thereby make and can produce MEDIA FLOW.
Equipment can be integrated easily, promptly can miniaturization, can not bear power loss simultaneously.Thereby when being configured to loudspeaker, can obtain loudspeaker by single little module, there be not the power loss relevant simultaneously with this zone; On the other hand, under the situation of miniaturized loudspeakers, for example can obtaining, those only are used for the acoustic pressure of big loudspeaker in the art.When using equipment according to the present invention to construct pump, can obtain to be particularly useful for gas, also can be used for the pump extremely accurately regulated of to carry out of liquid in theory.Thereby this pump or pumping unit are particularly suited for distributing a small amount of odoring substance or the analog of accurate measurement.
Especially preferredly be, when equipment according to the present invention is used to realize loudspeaker, when equipment is in the inaction serviceability, provided so lax or " absent-mindedness " vibrating diaphragm then deviate from all systems of loudspeaker before fully, in speaker system before, even guide the vibrating diaphragm to-and-fro motion alternatively, but under speaker system activity and inactive serviceability, vibrating diaphragm is all by mechanically tensioning.Yet with traditional loudspeaker comparatively speaking, the equipment that has high deformation diaphragm means or vibrating diaphragm according to the present invention can make the air of larger volume move, and can obtain the very big useful volume with respect to the loudspeaker total volume like this.Under the situation of traditional dynamic loudspeaker system or electrostatic loudspeaker systems, without exception all based on resonance, the ratio of useful volume and total volume usually below 10%-especially be about 7%.Yet,, can reach the useful volume (with respect to total volume) of 70%, 80% even 90% (promptly having increased by 10 times) for equipment according to the present invention.In this case, diaphragm means can be positioned on the chamber wall, in this case, according to structure, provide thin dielectric layer afterwards on chamber wall, chamber wall can be used as electrode at least in part, perhaps originally provides isolation layer on one's body in diaphragm means.In order to realize this drive system, it is also contemplated that providing the diaphragm means that has electric charge, in this case, the electric charge of diaphragm means can keep not having basically loss (this charged paper tinsel itself is present technical merit present situation) in the time in several years.The another kind of possibility that is used for the diaphragm means structure is included in several sections is provided on the diaphragm means, that is, piezoelectric or coating, they are electrical insulation each other, and when applying correspondent voltage, for the Amoebida of diaphragm means and applied mechanical pressure.Metal foil can be used for diaphragm means, can voltage be applied on the diaphragm means with respect to the electrode that is arranged in the chamber wall zone, and diaphragm means just deforms in the alternating field between electrode like this, and thereby produces mechanical internal tension.It is also contemplated that the dielectric material paper tinsel is used to realize diaphragm means.
Diaphragm means can be utilized two isolated stub areas and be fixed in the chamber, between these stub areas, diaphragm means has the structure of aforesaid lax or absent-mindedness, and afterwards under the activity operations state deformable and produce mechanical internal tension so that the medium of mobile large volume.
For the diaphragm means drive unit of assisting to be used to make diaphragm means that required distortion take place is electro-mechanical driving device or exciting bank, dynamo-electric driving element, especially can additionally act on the end of diaphragm means as the piezo mechanical element, this driving element is by being installed in the capable ripple that electrode on diaphragm means and/or the chamber wall helps to produce diaphragm means.
Chamber can be a channel form, that is to say, is provided with the substantially cuboidal hole that is used for move media, especially gas medium in relative endwall region.Diaphragm means also especially preferably has substantially invariable thickness on its length, can realize the advantage of fairly simple manufacturing thus.
As indicated above, in the device in accordance with the invention,, can take some measures diaphragm means by accessory drive suitably, it is produced in operation corresponding to progressive wave or row wave deformation; Yet, it is contemplated that, diaphragm means can be fixed by its stub area is fixed on the chamber wall respect to one another, and be arranged between them, under the in operation like this or activity operations state, the transition portion of advancing is to form the angle of approximate right angle or slight inclination with respect to chamber wall and to extend between chamber wall respect to one another basically.Thisly extend to the drive unit of the transition portion of another chamber wall, between at least one medium holes of two ends and chamber, move back and forth sustainably by respective design from a chamber wall.In this case, chamber is preferably formed as the whole cube passage of rectangular cross-section.Yet owing to moving back and forth of volume of air, this structure is not suitable for pump, but is very suitable for the sounder (loudspeaker) that wherein big volume of air moves back and forth.Because acoustic pressure is roughly proportional with the volume of air that moves, so especially can be assembled into little a lot of loudspeaker of inactivity loss by single little module.What must remember here is, under the situation of existing miniaturized loudspeakers, can only move very little volume of air, produces minimum sound level, so these little loudspeakers can only be used near ear or its.By contrast, under aforesaid situation according to equipment of the present invention, removable 10 times of big volume of air, promptly, can improve the ratio of mobile volume of air and parts total volume significantly, less so relatively loudspeaker can be applicable in the application away from ear, and realizes with predetermined sound level and little a lot of overall dimension.
Under the situation of above line ripple configuration, can reach the ratio of mobile preferably volume of air and total volume, wherein, above-mentioned diaphragm means produces and is similar to capable wave deformation, and its frequency can be in the ultrasonic wave range.For this capable ripple vibrating diaphragm, provide at least one full-wave train of mobile diaphragm means; Yet diaphragm means preferably can produce the more distortion of long wave row, for example corresponding to 1
1/
2Or the distortion of 2 wavelength,, also can cause the fluctuation displacement of diaphragm means generation preset frequency here by different driving sources, the displacement of diaphragm means produces the row ripple.The capable ripple of diaphragm means produces the air stream of unidirectional variation in time, and it is similar to " air pump ", has wherein comprised filter action alternatively; Cause in pulse under the situation of capable ripple, the intensity of air stream or amplitude can by the row wave propagation velocity, be that pulse frequency changes.Under the critical condition of the single wave train, say that strictly can not refer to capable ripple again, the distortion of diaphragm means weakens significantly to be become with the vibration of second harmonic and the phase place that interfixes at high proportion.
Illustrate these and other aspect of the present invention by non-limiting example and with reference to following examples.
Description of drawings
In the accompanying drawings:
Fig. 1 has schematically shown the longitudinal section of the equipment of the loudspeaker form that is used to produce MEDIA FLOW, has shown among the figure with respect to two two terminal positions of diaphragm means of chamber wall toward each other.
Fig. 2 has shown the comparable longitudinal section of similar loudspeaker apparatus, but drive unit revises with respect to the existing institute of the drive unit of Fig. 1, has also shown the neutral position of the vibrating diaphragm in operating among the figure.
Fig. 3 has shown the another embodiment of the present invention that is used to produce MEDIA FLOW, and it is based on the principle of forcing the row ripple, and can be used as loudspeaker and pump.
Fig. 4 has shown the like device that has capable ripple diaphragm means but have modified drive unit with comparable schematic longitudinal sectional.
Fig. 5 has shown the diaphragm means of band piezoelectric material layer with partial schematic diagram.
Fig. 6 to 9 has shown that the another kind shown in Fig. 3 and 4 has the equipment of the diaphragm means that only forms half wave train, and this diaphragm means is shown as and is in different time points, promptly under the different distortion state.
Figure 10 shown when for example constructing loudspeaker according to the equipment of Fig. 3 or 4, is applied to the pulse signal on the diaphragm drive means and the figure of caused sound signal.
Figure 11 has shown the block diagram that is used to control this equipment (according to Figure 10).
Embodiment
Fig. 1 has schematically shown the aufbauprinciple of the equipment 1 that is used to produce MEDIA FLOW, wherein diaphragm means 5 is arranged on two chamber walls 2 of location relatively, between 3, these walls define the cube chamber that is used for MEDIA FLOW that is formed by passage 4 with two not concrete sidewalls that show, sidewall laterally (being the plane of parallel drawing) links to each other with chamber wall 2,3.This diaphragm means 5 (being called for short vibrating diaphragm 5 later on) is fixed on the chamber wall 3 that makes back-end region 5.1 be fixed on to be in bottom shown in Figure 1, and its another relative front end area 5.2 is fixed on another chamber upper wall 2, with respect to cube passage 4, these two fixed area along diameter toward each other like this.In addition, vibrating diaphragm 5 is with respect to chamber wall 2,3rd, electrical insulation, and the drive unit that is generally electromechanical type 6 that is used to encourage vibrating diaphragm 5 is provided.Be different from conventional loudspeakers such as dynamic loudspeaker or electrostatic loudspeaker, under the situation of existing equipment 1, although stub area 5.1 and 5.2 is fixed, but not tensioning of vibrating diaphragm 5, yet, be in inactive serviceability following time at equipment 1, vibrating diaphragm 5 is lax or be arranged in the chamber that is formed by passage 4 with unclamping.
According to Fig. 1, drive unit 6 comprises control signal source 7, when equipment 1 is in active state, by the electric control signal (or some control signal) of control signal source 7 generations corresponding to concrete sound, and this control signal is applied on vibrating diaphragm 5 and/or the electrode by chamber wall 2,3 formation.Vibrating diaphragm 5 for example comprises thin metal foil, and it has the thickness of micrometer range to nanometer range.Dielectric foil or the paper tinsel of mixing silicon materials also are fine.As shown in fig. 1, relative chamber wall 2,3 is under the different electromotive forces clearly, and in Fig. 1, it is represented by sign "+" and ground connection sign respectively, and provides signal voltage to vibrating diaphragm 5.According to the voltage that is applied on the vibrating diaphragm 5, for example the voltage that is provided by control signal source 7 can pull to chamber wall 2 or 3 with vibrating diaphragm 5, and rebounds from corresponding another chamber wall 3 or 2, the result, and vibrating diaphragm 5 produces distortion according to the natural law of static.Vibrating diaphragm 5 take place as shown in Figure 1 distortion, promptly from shown in solid line position be deformed to by shown in during dotted line position, displacement takes place and moves along the direction of arrow 9 in volume of air 8.In that distortion is when getting back to position shown in the solid line subsequently, in this embodiment's equipment 1, the direction of displacement of volume of air is reverse once more.This distortion of vibrating diaphragm 5, and produce therefrom move back and forth the natural resonance that MEDIA FLOW (gas volume) is independent of vibrating diaphragm 5, but the signal that is applied according to control signal source 7 carries out.At any one time in two relative positioning chambers 2, that part of vibrating diaphragm 5 that extends between 3 can be called transition portion 10, and comparatively speaking with the neutral position of transition portion 10 shown in Figure 2, transition portion 10 is along with adding vibrating diaphragm distortion and moving to the front from behind along direction shown in the arrow 9, returns along the opposite direction of arrow then.Moving of transition portion 10 by vibrating diaphragm 5, the respective air volume on vibrating diaphragm 5 one sides can be discharged from passage 4 (at the one end), but is received on opposite side.In this way, as mentioned above, volume of air is moving on the direction of arrow 9 or on the opposite direction, and along with the carrying out of corresponding fast moving, produces the respective quadrature time variant voltage from control signal source 7 to electrode simultaneously, thereby cause sending corresponding sound wave.Maximum removable volume of air is limited by two limit positions of vibrating diaphragm 5 shown in Figure 1, that is to say, is between two limit positions of transition portion 10.Yet, different with the situation of dynamic loudspeaker is, under the situation of apparatus shown 1, maximum removable volume of air and the acoustic pressure of acoustic wave action on per unit loudspeaker area that produces therefrom, can only depend on air passageways, be the length d of passage 4, but not depend on two other sizes of loudspeaker, promptly transverse to the distance between size on the direction of Fig. 1 drawing and two chamber walls 2,3.Like this, just can realize being used for the modular principle of loudspeaker, wherein,, the several modules corresponding to Fig. 1 can be arranged to form arranged side by side, promptly be parallel to the form of drawing and upper and lower settings, and control concurrently according to required sound level.Then, this plurality of modules the zone that will produce with respect to the mosaic shape of phonate hole is set, in this case, the zone of mosaic shape can comprise the almost zone of any geometrical shape, for example zone of circle, triangle, rectangle or areas with irregular.In addition, the setting of module can being turned up the soil each other partially, final like this setting can have the structure of stratification.But have only finite region or volume time spent under the situation as the loudspeaker in the instrument, for example under the situation of mobile phone etc., this set is favourable.
Because vibrating diaphragm 5 itself leans against chamber wall 2 when operation, on 3, so between these parts, need electrical insulation, for example, by chamber wall 2,3 insulation coating can be realized this electrical insulation, but in Fig. 1 for the purpose of simplifying, this has just schematically shown isolation layer 11 on epicoele locular wall 2.Yet as alternative, vibrating diaphragm 5 itself can be provided with the corresponding insulation layer.
In order to offset any physical force (for example Van der Waals force) that occurs between vibrating diaphragm 5 and the isolation layer 11, vibrating diaphragm 5 and/or this isolation layer 11 can have coarse or structurized surface.
In addition, also shown erecting device 12 in Fig. 1, this erecting device 12 carries relatively the chamber wall 2,3 (and unshowned sidewall) of location, and main expection is used to realize that the sound of " front " and " back " of loudspeaker separates.
Fig. 2 has shown very similarly equipment 1 with comparable schematic view, it produces sound by lax vibrating diaphragm 5, vibrating diaphragm 5 is fixed in the rear end of cavity of resorption locular wall 3 and the front end place of epicoele locular wall 2 again, epicoele locular wall 2 is positioned at chamber wall 3 opposites, so just forming the transition portion 10 that when operating, has moved between two chamber walls 2,3.In Fig. 2, to compare with two terminal positions of Fig. 1 shown in clearly, the transition portion 10 of this vibrating diaphragm 5 has been positioned at the neutral position, and demonstrates it by a dotted line be in another neutral position in Fig. 2.
Different with situation shown in Figure 1, in this case, by with electrode 2.1,2.2,2.3... and 3.1,3.2,3.3... (in all cases, only the mode by non-limiting example has shown three electrodes) is installed in respectively on two 2,3 chamber walls and realizes drive unit 6, and these two chamber walls 2,3 adopt the form of insulator.Vibrating diaphragm 5 for example comprises thin conductive material again, is thin metal foil.Should be noted that vibrating diaphragm 5 can be formed by the thin silicon foil of mixing, and also can be formed by charged thin dielectric material.This charged foil material for example itself can be formed by traditional polycarbonate paper tinsel structure, and it piles up and the process drawing process each other.This has just produced the composite insulating foil of band cavity, and ionization can be carried out by electron bombard in these spaces.The gained electric charge can keep the several years at ambient temperature.This charged paper tinsel itself is known, and also can be used for purposes of the present invention.
Electrode 2.1,2.2,2.3... and 3.1,3.2 3.3... (certainly, in all cases, also can with shown in three be installed in chamber wall 2 with upper electrode, on 3) receive corresponding signal respectively by control corresponding line 13 and 14 from control signal source 7, thus vibrating diaphragm 5 is partly periodically pulled to chamber wall 2 and 3, and it is rebounded from another chamber wall 3 and 2.For example, Fig. 2 has shown the situation that vibrating diaphragm 5 (it has negative potential) is pulled to first lower electrode 3.1 on the cavity of resorption locular wall 3.Other upper electrode 2.2 and 2.3 is still positively charged at this moment, and therefore electronegative vibrating diaphragm 5 is attracted.Then in next phase place, the electromotive force of target 2.2 (from+right-) and the electromotive force of electrode 3.2 (from-right+) change respectively, therefore transition portion 10 further guides to position shown in the dotted line, wherein in central region vibrating diaphragm 5 is applied suction by lower electrode 3.2.Carry out similar control in all other phase places, therefore, vibrating diaphragm 5 is along with control signal corresponding periodically produces distortion in this way, and transition portion 10 moves back and forth, and therefore exhausting air volume and it is drawn onto each side of equipment 1 periodically.In this way, deform with corresponding frequencies, just can produce required sound by vibrating diaphragm 5.If vibrating diaphragm 5 is configured to charged insulator (being that vibrating diaphragm 5 does not have electromotive force to connect), can utilizes electric repulsive force so; In this case, the electrical signal that comes from signal source 7 also can have relatively low voltage amplitude.
Can be assembled by some parts with reference to the described equipment 1 of Fig. 1 and 2 above, wherein, all parts all can be by making by integrated solid-state element.This structure can be modular, and itself can reduce the size of primary element as required.According to power requirements, single module can be coupled together concurrently, the whole sound energy flux that is produced and the quantity of module are proportional.In addition, because system do not operate under its natural frequency, so the intrinsic characteristic of sound source in fact still is subjected to the influence of ambient sound.Compare with conventional loudspeakers system, especially electric loudspeaker, the entire length d (see figure 1) of air passageways can be used for the displacement of air, and can produce high a lot of acoustic pressure.Specifically, the prior art frequently big ten (10) of aforesaid useful volume (i.e. the volume of mobile air) and total volume (whole volume) doubly.In whole frequency range, the sound energy flux that is produced is constant as the function of frequency, and in addition, the Direct Digital control signal is possible, for example with before apparent in described according to the operator scheme of equipment 1 shown in Figure 2.Important advantage is to mention modularization principle repeatedly,, can become loudspeaker by single module structure that is, does not have the power loss on the per unit area simultaneously.The linearity of the sound that is produced on amplitude in fact finally only depends on the linearity as the flow velocity of control signal function; If desired, can easily provide electronic calibration herein.
The chamber end 15 of Fig. 1 or equipment shown in Figure 21 ', 16 ' preferably openings, that is, they have formed the hole that is used for mobile air or sucks air.
Fig. 3 shown with Fig. 1 and 2 and compared the equipment of having revised 1 that is used to produce MEDIA FLOW, and it has at equipment 1 and is in vibrating diaphragm 5 lax or that unclamp in inaction serviceability following time; In this case, be in activity operations state following time at equipment 1, can add capable ripple to vibrating diaphragm 5 by the respective electrical excitation of drive unit 6, drive unit 6 is as described below and only shown its part.Equipment 1 according to Fig. 3 comprises the chamber with epicoele locular wall 2 and cavity of resorption locular wall 3 equally, and cavity of resorption locular wall 3 is positioned at the opposite (" on " and D score equally as shown in the figure) of epicoele locular wall 2.
Vibrating diaphragm 5 is rectangle substantially in planimetric map, and be arranged between these chamber walls 2,3, vibrating diaphragm 5 is fixed by its stub area 5.1 and 5.2 is separately fixed on aft bulkhead 15 and the front bulkhead 16, roughly be located in all cases in how much middle parts between these two chamber walls 2,3.Herein, the vibrating diaphragm 5 of back-end region 5.1 is equipped with the driving element 17 that preferably adopts the piezoelectric element form, by being similar to the driving element 17 of rocking bar excitation, can cause vibrating diaphragm 5 from the rear end starting oscillation.The capable wave excitation that is caused by alternating potential in the preferred oscillation excitation of this tail end and the vibrating diaphragm 5 is combined, alternating potential by signal source (as shown in Fig. 2 to 7; In Fig. 3, omitted this control for simplicity) be applied to the electrode 2.1,2.2 that lays respectively on the chamber wall 2,3 (also having insulation function), 2.3... and 3.1,3.2 is on the 3.3....Vibrating diaphragm 5 itself for example also has same by the negative potential that guide line applied, and guide line for example is a guide line 18 shown in dotted lines in Figure 2.As alternative, can negative charge be provided for vibrating diaphragm 5 equally from the outside, like this, it is exactly unnecessary applying electromotive force.Yet, must be connected in the corresponding control output of signal source 7, so that utilize required frequency (with signal frequency matched frequency) to realize oscillation excitation to electrode 2.1 to 3.3 according to the piezoelectric element formula driving element 17 of Fig. 3.
Same in the embodiment according to Fig. 3, vibrating diaphragm 5 can comprise the thin metal foil in micron or the nano thickness scope, and it has constant thickness.As the situation among Fig. 1 and 2, this metal that is used for vibrating diaphragm 5 for example can be an aluminium.
By electrode 2.1 grades are applied controlled pulse shape alternating potential, the vibrating diaphragm part is once more being similar to mode embodiment illustrated in fig. 2, and is subjected to the attraction and the repulsion of electrode respectively, thereby produces waveform; Yet present activation can make that the wave form varies of vibrating diaphragm 5 is traveling wave or row ripple, is represented the otherwise limit position of vibrating diaphragm 5 by dotted line in Fig. 3.
In the embodiment according to Fig. 3, in order to produce the row ripple on vibrating diaphragm 5, higher relatively electric field is necessary.In order to satisfy the requirement of low voltage, vibrating diaphragm 5 also can partly be made by piezoelectric element, as shown in Figure 4, that is, vibrating diaphragm 5 has the patterned surface with spaced piezoelectric layer, compare with Fig. 5, its shown having of this vibrating diaphragm 5 be located at respectively plastic carrier film 5 ' on " piezoelectric element " 20,21,22 and 23, that part of 24,25.These piezoelectric regions or piezoelectric element 20 to 25 are connected on the signal source similar to signal source shown in Figure 27 by contact and guide line again, so that on vibrating diaphragm 5, encourage the trip ripple by applying alternating potential with suitable phase shift, these contacts are similar with 14 to the guide line 13 among Fig. 2 with guide line, but specifically do not demonstrate.In Fig. 4, utilize the positive minus flag of polarity of the specific bias-voltage of " piezoelectric element " (not specifically illustrating) to show this principle; What should replenish is that alternating potential causes the positive hogging bending of piezoelectric layer respectively, and therefore causes the corresponding deformation of vibrating diaphragm 5.Under this situation according to Fig. 4 embodiment, chamber itself and chamber wall 2,3 thereof, end wall 15,16 and exist equally but unshowned sidewall can comprise insulating material.
Should be noted that under situation fixing device that is used for equipment 1 chamber or the erecting device 12 discussed exist according to Fig. 3 and 4 illustrated embodiments.These only schematically illustrated fixing devices 12 also are used for the sound decoupling between front side and the rear side in addition in Fig. 3 and Fig. 4.
In addition, in Fig. 3 and Fig. 4, respectively with the direct of travel of arrow 26 and 26 ' represent row ripple in the vibrating diaphragm 5.
Utilize the equipment shown in Fig. 3 for example or Fig. 4, can obtain and compare and stronger air displacement according to the equipment of Fig. 1 and Fig. 2, promptly, with according to the equipment of Fig. 1 and 2 Comparatively speaking, the ratio of useful volume (mobile volume of air) and parts volume even bigger (for example 80% or 90%, but not 70%).In other words, utilization is according to the equipment of Fig. 3 or Fig. 4, by can " pumping " the more medium of vibrating diaphragm 5, the ripple of wherein going is forced at vibrating diaphragm 5, for example under the situation of sounder, produced the capable ripple in the ultrasonic wave range, and the sound signal in the sub-audible sound frequency range limits by the integrated air volume that changes average generation.
In addition, from Fig. 3 and Fig. 4, also can find out, at relative chamber wall 2 near end wall 15,16, on 3, be provided with and be respectively applied for the hole 27,28 and 29 that medium flows into and medium leaves, 30, therefore, vibrating diaphragm 5 just can aspirate and discharge medium (air) when producing distortion along with the electromechanics excitation.These holes 27,28 and 29,30 effect is respectively, at its another side, promptly between these holes and corresponding adjacent end wall 15 and 16, stayed cavity, it is as damping " cavity ", carry out filtering to go the ripple mode pulsing airflow that distortion is produced to vibrating diaphragm 5, like this, just in the short time of being considered, formed the air-flow of constant in equipment 1 outside.The amplitude of this air-flow can pass through traveling wave, wave propagation velocity at once, and thereby the situation of the wave impulse excitation of being expert under change by pulse frequency, as shown in figure 10.Therefore, under high energizing frequency or the capable ripple propagated fast, the amplitude of air-flow can so and change according to the emission of sound wave.According to the excitation character of vibrating diaphragm 5, can be alternately on one and another direction the action line ripple, thereby the acquisition operator scheme similar with Fig. 2 to Fig. 1; Under this operator scheme, can advantageously avoid the constant portion of air-flow, make and have only the air-flow of amplitude variations partly to be used to produce sound.
In the Fig. 6 that shows the different operating phase place and relevant Fig. 7, Fig. 8 and Fig. 9, shown the critical condition of Fig. 3 or equipment shown in Figure 41, promptly form the situation of the single wave train by vibrating diaphragm 5.Under the sort of situation, pass through the alternating potential (being applied to 5 " piezoelectric elements " on one's body of electrode place shown in Figure 3 or vibrating diaphragm shown in Figure 4 locates) that applied, vibrating diaphragm 5 periodically produces distortion, for example referring to Fig. 6, distortion originates in roughly sine-shaped structure, wherein, as shown in Figure 7, in first phase place, vibrating diaphragm 5 rear portions that are positioned at Fig. 7 left side pull down, and upwards draw at the middle part of vibrating diaphragm 5; Therefore afterwards, referring to Fig. 8, upwards draw vibrating diaphragm 5 front portions that are positioned at the figure right side, has just realized comparing with Fig. 6 the opposite vibrating diaphragm of phase place 5 positions.Subsequently, referring to Fig. 9, the left part of vibrating diaphragm 5 or more the rear portion upwards draw once more, but the middle part pulls down, this waveform configuration 5 according to Fig. 9 is opposite with waveform configuration according to Fig. 7 on phase place.Next, arrive state shown in Figure 6 once more.Therefore, compare with the row of long wave more, for example Fig. 3 or the wave train shown in Figure 4, just reduced this motion of vibrating diaphragm 5, this vibration for the second harmonic at high proportion with fixed phase relationship is essential.
For the equipment according to Fig. 3 to Fig. 9, it is essential having only few parts equally, and also advantageously, this moment, all parts also all can be by making by integrated solid-state element.As required, can realize roughly miniaturization and similar modular equally, acoustical flow is proportional with the quantity of individual module on the whole.
In addition, under the situation that always produces unidirectional MEDIA FLOW, for example in according to Fig. 3 and Fig. 4 corresponding arrow 26 and 26 ' shown in direction from left to right on produce under the situation of MEDIA FLOW, can realize flowing uniformly, therefore under the situation of loudspeaker, lower frequency limit is 0Hz.On the other hand, this operator scheme can be used to realize a kind of medium pump, and it can be adjusted and measure extremely quickly and accurately, and especially generally is applicable to the transmission of air or gas, and in theory also can be used for the transmission of liquid medium.Also can use digital stimulus signal here, and the linearity on the amplitude (a small amount of harmonic wave) in fact only depends on as the linearity of the flow velocity of the function of control signal, if desired, can provide electronic compensation alternatively.As long as possible in principle, the acoustical flow of the sound source that is produced (as the function of frequency) can be constant equally in whole frequency range, and can construct loudspeaker by single module, does not have the power loss of per unit area simultaneously.
By producing a kind of very small thickness PZT material commonly used of (being equivalent to 1 micron), also can provide the piezoelectricity vibrating diaphragm, for example according to the piezoelectricity vibrating diaphragm of Fig. 4, this PZT material is applied on the carrier foil, perhaps can directly be used as vibrating diaphragm, wherein the single part of vibrating diaphragm is isolated.
Figure 10 how schematically to have shown can by pulse frequency change relatively than short burst 31, and to vibrating diaphragm 5 shown in Figure 9, produce distortion and row ripple at vibrating diaphragm, for example Fig. 1.Vibrating diaphragm produces distortion by these pulses 31, makes volume of air alternately move back and forth, thereby produces the sound signal 32 with the frequency that is lower than pulse frequency.Compare with this sound signal 32 that is in the sub-audible sound frequency range, pulse 31 has ultrasonic frequency.
In order to produce this pulse 31, it perhaps generally speaking is control signal, according to Figure 11, used voltage-frequency converter 33, electrical signal from unshowned amplifier or available similar signal circuit provides to the input end of transducer 33, the required sound signal of this signal reflection (or optionally control signal, be used to measure medium volume waiting for transmission).What link to each other with voltage-frequency converter 33 is the electrode control unit 35 of tape pulse dresser and sift register, and it activates or encourage vibrating diaphragm 5 or entire equipment 1 then.
What should be mentioned that is that with regard to the distortion of vibrating diaphragm 5, especially its bending, the demonstration in the accompanying drawing is just schematic, and some is exaggerative; In fact, littler bending and deflection can appear in 5 of vibrating diaphragms, and promptly the ratio of height and length is littler.
Claims (22)
1. equipment (1) that is used to produce MEDIA FLOW, described equipment (1) comprises chamber (4), described chamber (4) comprises chamber wall (2 respect to one another, 3) and at least one be used for the medium holes (15 ' of MEDIA FLOW (8), 16 ', 27,28,29,30), and be equipped with diaphragm means (5), described diaphragm means (5) is arranged to and is configured for produce described MEDIA FLOW (8), be in inactive serviceability following time at described equipment (1), described diaphragm means (5) roughly loosely is located in the described chamber (4) and is positioned at described chamber wall (2,3) between, drive unit (6) is associated with described diaphragm means (5), described drive unit (6) drives described diaphragm means (5) distortion in response to electric drive signal, described drive unit (6) is arranged to force distortion when described equipment (1) is in activity operations state following time on described diaphragm means (5), in described deformation process, described diaphragm means (5) has mechanical internal tension, and wherein said equipment (1) is arranged for the MEDIA FLOW of passing through to be produced and produces sound.
2. equipment according to claim 1 (1) is characterized in that, described drive unit (6) comprises that (2.1,2.2...3.3), it is arranged on the described chamber wall respect to one another (2,3) electrode.
3. equipment according to claim 2 (1) is characterized in that, described diaphragm means (5) comprises metal foil.
4. equipment according to claim 2 (1) is characterized in that, described diaphragm means (5) comprises the paper tinsel that dielectric material is made.
5. equipment according to claim 1 (1) is characterized in that, described diaphragm means (5) comprises at least a portion piezoelectric material.
6. equipment according to claim 5 (1) is characterized in that, described diaphragm means (5) comprises electrode.
7. equipment according to claim 1 (1) is characterized in that, described diaphragm means (5) comprises the stub area (5.1,5.2) of two certain distances that are spaced from each other, and described stub area (5.1,5.2) is fixed in the described chamber (4).
8. equipment according to claim 1 (1) is characterized in that, described drive unit (6) comprises dynamo-electric driving element (17), and described diaphragm means (5) has the end portion (5.1) that is connected on the described dynamo-electric driving element (17).
9. equipment according to claim 1 (1) is characterized in that, described chamber (4) has the structure of substantially cuboidal, and comprises two end walls respect to one another (15,16).
10. equipment according to claim 1 (1) is characterized in that, described chamber (4) comprises at least two medium holes of being arranged to be spaced apart from each other (27,28,29,30).
11. equipment according to claim 1 (1) is characterized in that, described diaphragm means (5) has substantially invariable at least thickness.
12. equipment according to claim 9 (1) is characterized in that, described diaphragm means (5) is fixed into and makes described two relative stub areas (5.1,5.2) be fixed on the end wall (15,16) of described substantially cuboidal chamber (4).
13. equipment according to claim 1 (1) is characterized in that, described drive unit (6) but be designed to force the distortion that has preset frequency at least.
14. equipment according to claim 12 (1) is characterized in that, described drive unit (6) is designed to force the periodically deforming of capable waveshape on described diaphragm means (5).
15. equipment according to claim 9 (1), it is characterized in that, described diaphragm means (5) is fixed into the described stub area (5.1) that makes near described cube chamber (4) one ends and is fixed on described chamber wall toward each other (2,3) on the chamber wall (3) in, then be fixed on another chamber wall (2) in the described chamber wall toward each other (2,3) near the relative stub area (5.2) of the relative end of described chamber (4).
16. equipment according to claim 15 (1) is characterized in that, described diaphragm means (5) comprises transition portion (10), and it is approximately perpendicular to described chamber wall respect to one another (2,3) in operation and extends.
17. equipment according to claim 15 (1) is characterized in that, (15 ', 16 ') are arranged on the two ends of described chamber (4) to described medium holes.
18. equipment according to claim 1 (1) is characterized in that, in described equipment (1), described MEDIA FLOW (8) is a gas medium stream.
19. equipment according to claim 1 (1) is characterized in that, described equipment (1) is as the pumping equipment of described MEDIA FLOW.
20., it is characterized in that be provided with a plurality of chambers (4) in the described equipment (1), described a plurality of chambers (4) are arranged to a unit according to the described equipment of arbitrary claim (1) in the aforesaid right requirement.
21. equipment according to claim 1 (1) is characterized in that, described diaphragm means (5) and/or chamber wall (2,3) have isolation layer (11).
22. equipment according to claim 2 (1) is characterized in that, described diaphragm means (5) and/or chamber wall (2,3) have structurized surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03101954 | 2003-06-30 | ||
| EP03101954.0 | 2003-06-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1813133A CN1813133A (en) | 2006-08-02 |
| CN100430599C true CN100430599C (en) | 2008-11-05 |
Family
ID=33547778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800183399A Expired - Fee Related CN100430599C (en) | 2003-06-30 | 2004-06-28 | Device for generating a medium stream |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2007518910A (en) |
| CN (1) | CN100430599C (en) |
| AT (1) | ATE422614T1 (en) |
| DE (1) | DE602004019419D1 (en) |
| WO (1) | WO2005001287A1 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7889877B2 (en) | 2003-06-30 | 2011-02-15 | Nxp B.V. | Device for generating a medium stream |
| GB0508194D0 (en) * | 2005-04-22 | 2005-06-01 | The Technology Partnership Plc | Pump |
| DE102006016571B4 (en) * | 2006-04-06 | 2008-09-04 | Bartels Mikrotechnik Gmbh | Method and device for the automated conveyance of liquids or gases |
| US8641691B2 (en) | 2006-09-28 | 2014-02-04 | Smith & Nephew, Inc. | Portable wound therapy system |
| SG176226A1 (en) * | 2009-06-03 | 2011-12-29 | The Technology Partnership Plc | Fluid disc pump |
| US8821134B2 (en) | 2009-06-03 | 2014-09-02 | The Technology Partnership Plc | Fluid disc pump |
| GB201015656D0 (en) | 2010-09-20 | 2010-10-27 | Smith & Nephew | Pressure control apparatus |
| US9084845B2 (en) | 2011-11-02 | 2015-07-21 | Smith & Nephew Plc | Reduced pressure therapy apparatuses and methods of using same |
| GB201202346D0 (en) | 2012-02-10 | 2012-03-28 | The Technology Partnership Plc | Disc pump with advanced actuator |
| EP2836711A1 (en) | 2012-03-07 | 2015-02-18 | KCI Licensing, Inc. | Disc pump with advanced actuator |
| US9427505B2 (en) | 2012-05-15 | 2016-08-30 | Smith & Nephew Plc | Negative pressure wound therapy apparatus |
| US10973965B2 (en) | 2014-12-22 | 2021-04-13 | Smith & Nephew Plc | Systems and methods of calibrating operating parameters of negative pressure wound therapy apparatuses |
| WO2018122400A1 (en) * | 2016-12-30 | 2018-07-05 | Koninklijke Philips N.V. | Electrostatic peristaltic pump and method of operation |
| CN111379692A (en) * | 2018-12-29 | 2020-07-07 | 宁波永基精密科技有限公司 | Diaphragm pump and diaphragm |
| GB2583880A (en) | 2020-07-31 | 2020-11-11 | Ttp Ventus Ltd | Actuator for a resonant acoustic pump |
| CN112814880B (en) * | 2021-01-08 | 2023-01-20 | 汤玉生 | Micropump chip structure for realizing injection charge driving |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4648807A (en) * | 1985-05-14 | 1987-03-10 | The Garrett Corporation | Compact piezoelectric fluidic air supply pump |
| WO1987007218A1 (en) * | 1986-05-30 | 1987-12-03 | Siemens Aktiengesellschaft | Piezoelectrically operated fluid pump |
| US4939405A (en) * | 1987-12-28 | 1990-07-03 | Misuzuerie Co. Ltd. | Piezo-electric vibrator pump |
| US6343129B1 (en) * | 1997-02-07 | 2002-01-29 | Sri International | Elastomeric dielectric polymer film sonic actuator |
| US20020146333A1 (en) * | 1998-08-11 | 2002-10-10 | Jean-Baptiste Drevet | Vibrating membrane fluid circulator |
-
2004
- 2004-06-28 CN CNB2004800183399A patent/CN100430599C/en not_active Expired - Fee Related
- 2004-06-28 DE DE602004019419T patent/DE602004019419D1/en active Active
- 2004-06-28 WO PCT/IB2004/051029 patent/WO2005001287A1/en active Application Filing
- 2004-06-28 AT AT04737203T patent/ATE422614T1/en not_active IP Right Cessation
- 2004-06-28 JP JP2006516774A patent/JP2007518910A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4648807A (en) * | 1985-05-14 | 1987-03-10 | The Garrett Corporation | Compact piezoelectric fluidic air supply pump |
| WO1987007218A1 (en) * | 1986-05-30 | 1987-12-03 | Siemens Aktiengesellschaft | Piezoelectrically operated fluid pump |
| US4939405A (en) * | 1987-12-28 | 1990-07-03 | Misuzuerie Co. Ltd. | Piezo-electric vibrator pump |
| US6343129B1 (en) * | 1997-02-07 | 2002-01-29 | Sri International | Elastomeric dielectric polymer film sonic actuator |
| US20020146333A1 (en) * | 1998-08-11 | 2002-10-10 | Jean-Baptiste Drevet | Vibrating membrane fluid circulator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005001287A1 (en) | 2005-01-06 |
| JP2007518910A (en) | 2007-07-12 |
| CN1813133A (en) | 2006-08-02 |
| ATE422614T1 (en) | 2009-02-15 |
| DE602004019419D1 (en) | 2009-03-26 |
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