WO2005001287A1 - Dispositif pour produire un flux de milieu - Google Patents

Dispositif pour produire un flux de milieu Download PDF

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Publication number
WO2005001287A1
WO2005001287A1 PCT/IB2004/051029 IB2004051029W WO2005001287A1 WO 2005001287 A1 WO2005001287 A1 WO 2005001287A1 IB 2004051029 W IB2004051029 W IB 2004051029W WO 2005001287 A1 WO2005001287 A1 WO 2005001287A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
chamber
diaphragm means
medium
walls
Prior art date
Application number
PCT/IB2004/051029
Other languages
English (en)
Inventor
Josef Lutz
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to JP2006516774A priority Critical patent/JP2007518910A/ja
Priority to US10/562,873 priority patent/US7889877B2/en
Priority to EP04737203A priority patent/EP1644639B1/fr
Priority to DE602004019419T priority patent/DE602004019419D1/de
Publication of WO2005001287A1 publication Critical patent/WO2005001287A1/fr

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Classifications

    • 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
    • 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
    • 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—Piezoelectric drive
    • 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

Definitions

  • the invention relates to a device for generating a medium stream, which device comprises a chamber, the chamber comprising chamber walls lying opposite one another and at least one medium opening for the medium stream and being equipped with a diaphragm means, which diaphragm means is provided and constructed for generating the medium stream.
  • Such a device in the form of a pump is known from the patent document US 2002/0146333 A, which pump is provided for generating a pumped medium stream and with which pump a fluid medium is transported from one side of the chamber to the other side of the chamber by a diaphragm deformed analogous to a progressive wave or travelling wave.
  • the slack, deformable diaphragm fixed at both ends has a defined thickness progression, and the fluid medium is transported from that end region of the chamber where the diaphragm is of relatively large thickness and is induced, for example, by means of e.g.
  • the wave induced in the diaphragm corresponds to a natural mode of the diaphragm, and is therefore not a forced oscillation having an adjustable running speed and an adjustable frequency.
  • Such an excitation of the diaphragm is effected, as mentioned, at the admission end of the diaphragm, and, to generate the travelling wave, considerable damping as a consequence of the transported fluid is essential; the excitation frequency has to be kept low, for example in the range from 40 Hz to 80 Hz, in order to achieve an efficient transport of fluid.
  • this device shall moreover be capable of being realized in a miniaturized type of construction.
  • a high offset voltage is needed, and without offset voltage it is not possible to operate the loudspeaker with the desired parameters.
  • a high useful volume i.e. a high volume of air moved by the diaphragm
  • a modular construction with no power loss is desirable, as well as a miniaturization of the device.
  • a device for generating a medium stream which device comprises a chamber, which chamber comprises chamber walls lying opposite one another and at least one medium opening for the medium stream and is equipped with a diaphragm means, which diaphragm means is provided and constructed for generating the medium stream and which diaphragm means, in an inactive operating state of the device, is arranged substantially untensioned in the chamber between the chamber walls and which diaphragm means has associated with it drive means, responsive to electrical drive signals, for driving the diaphragm means with the diaphragm means undergoing deformation, the drive means being arranged to impose a deformation on the diaphragm means in an active operating state of the device, during which deformation the diaphragm means have an inner mechanical tension.
  • the great advantage of the device according to the invention is that the drive means for driving the diaphragm means are preferably provided or are effective over substantially the entire (effective) length of the diaphragm means and/or of the chamber.
  • the diaphragm means or the diaphragm is therefore not (or not necessarily) operated in a natural mode, and an excitation or the driving of the diaphragm can be effected over the entire diaphragm area, in which case a comparatively uniform behaviour is achievable.
  • Driving of the diaphragm means is effected in such a way that a deformation of the diaphragm means is caused, the diaphragm means then having or developing an inner mechanical tension and a mechanical strength being consequently given to the diaphragm means, thus enabling the medium stream to be generated.
  • the device is capable of being easily integrated, i.e. is capable of miniaturization, without having to accept power losses.
  • loudspeakers When constructed as a loud speaker, it is accordingly possible to realise loudspeakers from individual small modules without power loss in relation to the area; on the other hand, in the case of miniaturized loudspeakers, it is possible to achieve sound pressures such as those possible in the art only for larger loudspeakers.
  • the device according to the invention When the device according to the invention is used to construct pumps, extremely finely adjustable pumps can be obtained, especially for gases, and also in principle for liquids as well. Such pumps or pump devices are suitable in further consequence especially for the emission of exactly metered small amounts of odour substances or the like.
  • the device according to the present invention is used to realise a loudspeaker, then the loose or "slack" diaphragm provided in an inactive operating state of the device represents a complete departure from all previous loudspeaker systems, in which the diaphragm, even if it was optionally guided back and forth, was tensioned mechanically, both in an active and in an inactive operating state of the loud speaker system.
  • the device according to the invention with the diaphragm means or the diaphragm and its high degree of deformation is able, however, to move a large air volume compared with the conventional loudspeakers, so that an extremely high useful volume, in relation to the overall volume of the loudspeaker, can be achieved.
  • the ratio of useful volume to overall volume is regularly below 10% - especially around 7%.
  • the diaphragm means can in this case position itself against the chamber walls, in which case, depending on construction, a thin insulating layer will then be provided on the chamber walls, the walls, at least in sections, being able to function as electrodes, or the insulating layer will be provided on the diaphragm means itself.
  • a diaphragm means provided with an electrical charge in which case the electrical charge of the diaphragm means is maintained over a period of years with no substantial losses (such foils provided with an electrical charge are per se already state of the art).
  • diaphragm means Another possibility for the construction of the diaphragm means consists in providing on the diaphragm means, in sections, piezoelectric sections or coatings which are isolated from one another electrically and, when corresponding electrical voltages are applied, exert mechanical forces for the purpose of deforming the diaphragm means.
  • a metal foil can be used for the diaphragm means, to which an electrical voltage is applied relative to electrodes provide in the region of the chamber walls, so that the diaphragm means deforms in the alternating field between the electrodes and is consequently imparted the inner mechanical tension.
  • a foil of a dielectric material is also conceivable for realization of the diaphragm means.
  • the diaphragm means can be fixed in the chamber with two spaced apart end regions, wherein between these end regions the diaphragm means has a loose or slack configuration, as mentioned above, and then, in the active operating state, is deformable for the purpose of displacing a large volume of medium and develops an inner mechanical tension.
  • the drive i.e.
  • an electromechanical drive element such as especially a piezomechanical element, can act additionally on the diaphragm means at the end thereof, this drive element assisting the generation of a travelling wave of the diaphragm means by means of electrodes mounted on the diaphragm means and/or on the chamber walls.
  • the chamber can be in the form of a channel, that is, substantially cuboidal, openings for the displaced medium, especially gaseous medium, being provided in the region of the opposite end walls.
  • the diaphragm means has furthermore, as is especially preferred, a substantially constant thickness over its length, by which ter alia the advantage of a comparatively simple manufacture is achieved.
  • This transition portion extending from the one chamber wall to the other is displaced continuously back and forth between the two ends and the at least one medium opening of the chamber respectively by means of the correspondingly designed drive means.
  • the chamber forms also in this case preferably an on the whole cuboidal channel of rectangular cross-section. Because of the displacement back and forth of volumes, this construction is not, however, suitable as a pump, but is very suitable as a sound generator (loudspeaker), wherein a comparatively large volume of air is displaced back and forth. Since the sound pressure is approximately proportional to the displaced volume of air, a substantially smaller loudspeaker with no power loss can be assembled, in particular from individual small modules.
  • a somewhat better ratio of displaced air volume to overall volume can be achieved in the case of the above-described travelling wave construction option, in which the diaphragm means, as mentioned, is deformed analogous to a travelling wave - the frequency of which can lie in the ultrasound range.
  • this travelling wave diaphragm at least one full wave train of the displaced diaphragm means is provided; preferably, however, the diaphragm means can be deformed by a longer wave train, for instance corresponding to 1 Vi or 2 wavelengths.
  • the diaphragm means can be caused by different drive sources to execute undulatory displacements of pre-determinable frequency, the displacements of the diaphragm means producing a travelling wave.
  • the travelling wave of the diaphragm means generates an air stream varying in time in one direction, similar to a "air pump", wherein optionally a smoothing can be incorporated; the intensity or amplitude of the air stream can be varied by the speed of the travelling wave, that is, by the frequency of the pulses where the travelling wave is induced by pulses.
  • the deformation of the diaphragm means is reduced substantially to an oscillation with a high proportion of a second harmonic and a fixed phase relation to one another.
  • Fig. 1 shows schematically a longitudinal section through a device for generating a medium stream in the form of a loudspeaker, two end positions of the diaphragm means relative to two chamber walls lying opposite one another being illustrated.
  • Fig. 2 shows in a comparable longitudinal section a similar loudspeaker device, but with drive means that have been modified with respect to Fig. 1 , an intermediate position of the diaphragm means in operation additionally being shown.
  • Fig. 3 shows another embodiment of the present invention for generating a medium stream, which is based on the principle of a forced travelling wave and can be used both as a loudspeaker and as a pump.
  • Fig. 1 shows schematically a longitudinal section through a device for generating a medium stream in the form of a loudspeaker, two end positions of the diaphragm means relative to two chamber walls lying opposite one another being illustrated.
  • Fig. 2 shows in a comparable longitudinal section a similar loudspeaker device, but with drive means that have been modified with respect
  • FIG. 4 shows in a comparable schematic longitudinal sectional view a similar device with travelling wave diaphragm means, but with modified drive means.
  • Fig. 5 shows in a schematic and fragmentary view a diaphragm means with piezo material layers.
  • Figures 6 to 9 show a further device of the kind shown in Figs 3 and 4, but with a diaphragm means in which only a single wave train is formed, the diaphragm means being shown at different points in time, i.e. in different states of deformation.
  • Fig. 10 shows a diagram of the signal pulses to be applied to the diaphragm drive means and the resulting sound signal when the device according to Fig. 3 or 4 is constructed for instance as a loudspeaker.
  • Fig. 11 shows a block diagram for the control of such a device (according to Fig. 10).
  • Fig. 1 shows schematically the construction principle of a device 1 for generating a medium stream, wherein a diaphragm means 5 is arranged between two oppositely located chamber walls 2, 3, which, together with two lateral walls, not more specifically shown, that connect the chamber walls 2, 3 laterally (i.e. parallel to the plane of the drawing), define a cuboidal chamber formed by a channel 4 for the medium stream.
  • This diaphragm means 5, hereinafter called diaphragm 5 for short is fixed with a rear end region 5.1 to the chamber wall 3 at the bottom according to the illustration in Fig.
  • the diaphragm 5 is furthermore electrically isolated with respect to the chamber walls 2, 3, and generally electromechanical drive means 6 for energizing the diaphragm 5 are provided.
  • conventional loudspeakers like for instance dynamic loudspeakers or electrostatic loudspeakers, in the case of the present device 1 the diaphragm 5 is not tensioned, despite the secured end regions 5.1 and 5.2, but in an inactive operating state of the device 1 is arranged loose or slack in the chamber formed by the channel 4. According to Fig.
  • the drive means 6 comprise a control signal source 7, from which control signal source 7 in an active state of the device 1 an electrical control signal (or several control signals) corresponding to the particular sound to be generated is (are) applied to the diaphragm 5 and/or to electrodes formed by the chamber walls 2, 3.
  • the diaphragm 5 comprises, for example, a thin metal foil, having a thickness in the micrometer range to nanometer range. A dielectric foil or a foil of doped silicon material or the like would also be possible.
  • the opposite chamber walls 2, 3 are, as shown in Fig. 1, specifically at different electrical potentials, which is indicated in Fig. 1 by the symbols "+" and a grounding symbol respectively, and the signal voltage is supplied to the diaphragm 5.
  • the diaphragm 5 Depending on the voltage applied to the diaphragm 5, as supplied by the control signal source 7, the diaphragm 5 is drawn towards a chamber wall 2 or 3 and repelled from the respective other chamber wall 3 or 2, with the result that the diaphragm 5 is deformed in accordance with the natural laws of electrostatics.
  • an air volume 8 With a deformation of the diaphragm 5 for instance as seen in Fig. 1 , namely from the position shown by solid lines into the position shown by broken lines, an air volume 8 is displaced and moved in the direction of the arrow 9.
  • the direction of the displacement of the air volume in this embodiment of the device 1 is reversed again.
  • Such a deformation of the diaphragm 5, and hence generation of a medium stream (gas volume) moved back and forth, is effected independently of the natural resonance of the diaphragm 5, but in accordance with the signal applied by the control signal source 7.
  • That part of the diaphragm 5 that at any one time extends between the two oppositely located chamber walls 2, 3 can be called the transition portion 10, and this transition portion 10 is displaced corresponding to the imposed diaphragm deformation from the rear to the front in the direction of arrow 9 and then back in the opposite direction to the arrow, cf. also the intermediate position of the transition portion 10 in the illustration shown in Fig. 2.
  • the respective air volume on one side of the diaphragm 5 is expelled from the channel 4 (at one end thereof) by this displacement of the transition portion 10 of the diaphragm 5, but is sucked in on the other side.
  • an air volume is displaced in the direction of the arrow 9 or in the opposite direction, and with correspondingly rapid displacement processes, with corresponding alternating electrical voltages issued from the control signal source 7 to the electrodes, corresponding sound waves are emitted.
  • the maximum displaceable air volume is defined by the two extreme positions of the diaphragm 5 evident from Fig. 1 , that is, in particular between the two extreme positions of the transition portion 10.
  • the maximum displaceable air volume, and hence the sound pressure of the generated sound wave per unit of area of the loudspeaker to depend only on the length d of the air channel, i.e. the channel 4, and not on the two other dimensions of the loudspeaker, i.e. the dimension in the direction transversely to the plane of the drawing in Fig. 1 and the distance between the two chamber walls 2, 3 respectively.
  • the two other dimensions of the loudspeaker i.e. the dimension in the direction transversely to the plane of the drawing in Fig. 1 and the distance between the two chamber walls 2, 3 respectively.
  • the mosaic-like area can comprise almost any geometrical areas, for example, circular, triangular, rectangular areas or irregular areas.
  • the modules can additionally be arranged offset with respect to one another, whereby the resulting arrangement can be of layered construction. Such arrangements are advantageous when, in case of use as a loudspeaker in an appliance, only limited areas or volumes are available, such as, for example, in the case of mobile telephones or the like.
  • the diaphragm 5 positions itself against the chamber walls 2, 3 in operation, an electrical insulation is required between these components, which can be achieved, for example, by an insulating coating of the chamber walls 2, 3, but in Fig. 1 for the sake of simplicity this is shown only schematically at the upper chamber wall 2 with an insulation 11.
  • a corresponding insulation can alternatively, however, be provided on the diaphragm 5 itself.
  • the diaphragm 5 and/or the insulation 11 can have a rough or structured surface.
  • mounting means 12 are indicated in Fig.
  • FIG. 2 shows in a comparable schematic view a quite similar device 1 for generating sound by means of a slack diaphragm 5, the diaphragm 5 again being retained at the rear end of the lower chamber wall 3 and at the front end of the upper chamber wall 2 lying opposite the chamber wall 3, so that a transition portion 10 that moves in operation is formed between the two chamber walls 2, 3.
  • this transition portion 10 of the diaphragm 5 is already located in an intermediate position compared with the two end positions apparent from Fig.
  • the drive means 6 are realised by mounting electrodes 2.1, 2.2, 2.3 ... and 3.1, 3.2, 3.3 ... respectively (by way of non- limitative example only three electrodes are shown in each case) on the two chamber walls 2, 3, the two chamber walls 2, 3 moreover being in the form of insulators.
  • the diaphragm 5 comprises, for example, again a thin conductive material, namely a thin metal foil. It should be mentioned that the diaphragm 5 can be formed from a thin doped silicon foil, optionally also from a thin dielectric material with an electrical charge applied thereto.
  • Such a foil material with charge can be constructed, for example, from conventional polycarbonate foils per se, which are laid one on top of the other and are subjected to a drawing process. This produces a composite foil with cavities, and these cavities can be ionised by means of electron bombardment. The resulting electrical charge can be maintained at room temperature conditions for years.
  • Such charged foils are already known per se and can also be used for the present purpose.
  • Fig. 2 illustrates, for example, the situation in which the diaphragm 5 (here having a negative potential) is drawn towards the first lower electrode 3.1 on the lower chamber wall 3.
  • the further upper electrodes 2.2 and 2.3 are at this point in time still positively charged, so that the negative diaphragm 5 is attracted by them.
  • the potential of the middle electrodes 2.2 (from + to -) and 3.2 (from - to +) respectively is then changed, so that the transition portion 10 moves further into the position shown by a broken line, in which the diaphragm 5 is then attracted in the middle region by the lower electrode 3.2.
  • a similar control is effected in all other phases, so that upon corresponding control signals the diaphragm 5 is deformed cyclically in the described manner, with the transition portion 10 being displaced back and forth and hence with volumes of air being cyclically expelled and sucked in at each side of the device 1. In this way, with corresponding frequencies of the deformation of the diaphragm 5, in turn the desired sound can be generated.
  • the diaphragm 5 is constructed as a charged insulator (i.e. the diaphragm 5 has no potential connection), electrical repulsive forces can be exploited; in this case, the electrical signals applied from the signal source 7 can also have a relatively low voltage amplitude.
  • the devices 1 described above with reference to Figures 1 and 2 can be assembled from just a few components, wherein all components can be manufactured from integrable solid-state elements.
  • the construction can be modular, and the base element can be reduced in size virtually as desired.
  • the individual modules are connected in parallel, the sound energy flux generated overall being proportional to the number of modules.
  • the system Since, furthermore, the system is not operated at its natural frequency, the intrinsic properties of the sound source remain virtually influenced by the acoustic surroundings.
  • the overall length d of the air channel can be used for displacement of the air, and a substantially higher sound pressure can be generated.
  • the ratio already mentioned above of useful volume (i.e. volume of the displaced air) to the total volume (overall volume) is greater by a factor often (10) than in the prior art.
  • the sound energy flux generated is constant as a function of the frequency across the entire frequency range, and, furthermore, direct digital control signals are possible, as is apparent for example from the preceding explanation of the mode of operation of the device 1 according to Fig.
  • the linearity of the generated sound over the amplitude depends ultimately virtually only on the linearity of the flow rate as a function of the control signal; if desired, an electronic compensation can easily be provided here.
  • the ends 15', 16' of the chambers of the device 1 shown in Fig. 1 or 2 are preferably open, i.e. they form openings for the displaced air or sucked-in air. Fig.
  • FIG. 3 illustrates a device 1 for generating a medium stream that has been modified compared with Figs 1 and 2, having a diaphragm 5 that is loose or slack in the inactive operating state of the device 1; in this case, in the active operating state of the device 1 , a travelling wave is imposed on the diaphragm 5 by corresponding electrical excitation by means of drive means 6 still to be explained and only part of which is indicated.
  • the device 1 according to Fig. 3 again contains a chamber having an upper chamber wall 2 and a lower chamber wall 3 lying opposite this upper chamber wall 2 (upper and lower again referring to the illustration in the drawing).
  • the diaphragm 5 which in plan view is essentially rectangular, is arranged between these chamber walls 2, 3, the diaphragm 5 being fixed with its end regions 5.1 and 5.2 to a rear end wall 15 and a front end wall 16 respectively, in each case approximately in the geometrical middle between the two chamber walls 2, 3.
  • the rear end region 5.1 of the diaphragm 5 is here equipped with a drive element 17, preferably in the form of a piezo element, via which drive element 17, similar to an excitation by a swinging rod, the diaphragm 5 is caused to oscillate starting from the rear end.
  • This preferred excitation of oscillation at the end is combined with excitation of a travelling wave in the diaphragm 5 by alternating electrical potentials, which are applied to electrodes 2.1, 2.2, 2.3 ... and 3.1, 3.2, 3.3 ... respectively on the chambers walls 2, 3 - which incidentally again have an insulating function - from a signal source (rather like the illustration in Figs 2 to 7; this control has been omitted in Fig. 3 for the sake of simplicity).
  • the diaphragm 5 itself again has, for example, a negative potential, which is likewise applied by a control line, for example, the control line 18 shown by a broken line in Fig. 2.
  • the diaphragm 5 can again be provided from the outset with a - negative - electrical charge, so that applying an electrical potential is unnecessary. It is likely, however, that the piezoelectric element drive element 17 according to Fig. 3 will have to be connected to a corresponding control output of the signal source 7 in order to effect excitation of oscillation with the desired frequency - matched to the frequency of the signals to the electrodes 2.1 to 3.3. Also in the embodiment according to Fig. 3, the diaphragm 5 can comprise a thin metal foil in the micrometer or nanometer rang, and it has a constant thickness. The metal used for the diaphragm 5 can be, for example, as in the case of Figs 1 and 2, aluminum.
  • the diaphragm 5 can also be manufactured with piezo element portions, as illustrated in Fig. 4, i.e. the diaphragm 5 has a structured surface with piezoelectric layers separated from one another, cf. also Fig. 5, which shows a portion of such a diaphragm 5 having "piezo elements" 20, 21, 22 and 23, 24, 25 respectively disposed on a plastics carrier film 5'.
  • These piezoelectric areas or piezo elements 20 to 25 are again connected by way of contacts and control lines, not more specifically shown, similar to the control lines 13 and 14 in Fig. 2, to a signal source, similar to the signal source 7 in Fig.
  • the chamber itself with its chamber walls 2, 3, with the end walls 15, 16 and with the lateral walls, which are again present but not shown, can comprise an insulating material.
  • retaining or mounting means 12 for the chamber of the device 1 in question are present. These retaining means 12 are again indicated only rather schematically in Figs 3 and 4 and moreover serve for an acoustic decoupling between front side and rear side.
  • the running direction of the travelling wave in the diaphragm 5 is indicated in Figures 3 and 4 with arrows 26 and 26' respectively.
  • the ratio of useful volume (displaced air volume) to the volume of the component is even greater (for example 80% or 90% instead of 70%), compared with the embodiment according to Figs 1 and 2.
  • a device according to Fig. 3 or 4 even more medium can be "pumped through” by means of the diaphragm 5 on which the travelling wave is imposed, wherein, for example, in the case of a sound generator, a travelling wave in the ultrasound range is generated, whereas a sound signal in the audible frequency range is defined by the varying overall air volume occurring on average.
  • openings 27, 28 and 29, 30 respectively for the admission of medium and exit of medium respectively, in order thus to be able to draw in and expel medium (air) when the diaphragm 5 is deformed corresponding to the electromechanical excitation.
  • the effect of these openings 27, 28 and 29, 30 respectively is that on the other side thereof, that is, between them and the respective adjacent end wall 15 and 16, cavities are left, which, as damping "cavities", effect a smoothing of the pulsating airflow generated on deformation of the diaphragm 5 in the manner of a travelling wave, so that outside the device 1 a virtually constant airflow for the short time units under consideration occurs.
  • the amplitude of this airflow can be varied by the speed of the running wave, i.e. travelling wave, and thus by the frequency of the pulses in the case of pulsed excitation of the travelling wave, as is clear from Fig. 10.
  • the amplitudes of the airflow can consequently be varied in accordance with an emission of a sound wave.
  • the diaphragm 5 is cyclically deformed, for example, starting from an approximately sinusoidal wave configuration, see Fig. 6, wherein, as shown in Fig. 7, in a first phase the rear portion, on the left in Fig. 7, of the diaphragm 5 is drawn downwards, whilst the middle portion of the diaphragm 5 is drawn upwards; following that, the front portion, on the right in the drawing, of the diaphragm 5, is drawn upwards, see Fig. 8, so that a position of the diaphragm 5 opposite in phase compared with Fig. 6 is obtained.
  • Fig. 10 illustrates in a schematic diagram how a deformation and hence a travelling wave can be generated in a diaphragm, such as the diaphragm 5 according to Figures 1 to 9, by means of comparatively short pulses 31 varying in pulse rate.
  • the diaphragm is deformed with these pulses 31, so that, for example, an air volume is displaced alternately back and forth, so that a sound signal 32 having a lower frequency than the pulse rate is produced.
  • the pulses 31 have an ultrasound frequency.
  • a voltage-to-frequency converter 33 is used, to the input of which an electrical signal coming from an amplifier or similar useful signal circuit, not shown, is supplied, which reflects the desired sound signal (or optionally a control signal for metering medium volumes to be transported).
  • an electrode control unit 35 Connected to the voltage-to-frequency converter 33 is an electrode control unit 35 with a pulse shaper and a shift register, which then activates or excites the diaphragm 5 or generally the device 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating Pumps (AREA)
  • Paper (AREA)
  • External Artificial Organs (AREA)
  • Telephone Function (AREA)

Abstract

La présente invention concerne un dispositif (1) pour produire un flux de milieu, comportant une chambre (4) présentant des parois (2, 3) situées en regard l'une de l'autre et au moins un orifice (27, 28, 29, 30) destiné au flux de milieu. Ledit flux peut être produit dans la chambre (4) au moyen d'une membrane (5) qui, lorsque le dispositif (1) est au repos, est disposée, sensiblement sans tension, entre lesdites parois (2, 3) de ladite chambre (4). Un dispositif d'excitation (6) associé à ladite membrane (5) réagit à des signaux d'excitation électriques et excite cette dernière pour la déformer, ce dispositif d'excitation (6) étant conçu pour imprimer une déformation à la membrane (5) lorsque le dispositif (1) est en service, déformation durant laquelle la membrane (5) subit une tension mécanique interne.
PCT/IB2004/051029 2003-06-30 2004-06-28 Dispositif pour produire un flux de milieu WO2005001287A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2006516774A JP2007518910A (ja) 2003-06-30 2004-06-28 媒体流生成装置
US10/562,873 US7889877B2 (en) 2003-06-30 2004-06-28 Device for generating a medium stream
EP04737203A EP1644639B1 (fr) 2003-06-30 2004-06-28 Dispositif pour produire des sons par l'aide du flux d'un fluide
DE602004019419T DE602004019419D1 (de) 2003-06-30 2004-06-28 Vorrichtung zur erzeugung lauten mit hilfe einer erzeugten medienströmung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03101954.0 2003-06-30
EP03101954 2003-06-30

Publications (1)

Publication Number Publication Date
WO2005001287A1 true WO2005001287A1 (fr) 2005-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/051029 WO2005001287A1 (fr) 2003-06-30 2004-06-28 Dispositif pour produire un flux de milieu

Country Status (5)

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JP (1) JP2007518910A (fr)
CN (1) CN100430599C (fr)
AT (1) ATE422614T1 (fr)
DE (1) DE602004019419D1 (fr)
WO (1) WO2005001287A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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WO2010139916A1 (fr) * 2009-06-03 2010-12-09 The Technology Partnership Plc Pompe à disque pour fluides
US7889877B2 (en) 2003-06-30 2011-02-15 Nxp B.V. Device for generating a medium stream
WO2013117945A1 (fr) 2012-02-10 2013-08-15 The Technology Partnership Plc Pompe à disque avec actionneur avancé
WO2013134056A1 (fr) 2012-03-07 2013-09-12 Kci Licensing, Inc. Pompe à disques avec actionneur avancé
US8821134B2 (en) 2009-06-03 2014-09-02 The Technology Partnership Plc Fluid disc pump
US9084845B2 (en) 2011-11-02 2015-07-21 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US9227000B2 (en) 2006-09-28 2016-01-05 Smith & Nephew, Inc. Portable wound therapy system
US9427505B2 (en) 2012-05-15 2016-08-30 Smith & Nephew Plc Negative pressure wound therapy apparatus
US10682446B2 (en) 2014-12-22 2020-06-16 Smith & Nephew Plc Dressing status detection for negative pressure wound therapy
US11027051B2 (en) 2010-09-20 2021-06-08 Smith & Nephew Plc Pressure control apparatus
WO2022023703A1 (fr) 2020-07-31 2022-02-03 Ttp Ventus Ltd. Actionneur pour une pompe acoustique résonante
US12029549B2 (en) 2007-12-06 2024-07-09 Smith & Nephew Plc Apparatus and method for wound volume measurement

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CN111379692A (zh) * 2018-12-29 2020-07-07 宁波永基精密科技有限公司 隔膜泵和隔膜
CN112814880B (zh) * 2021-01-08 2023-01-20 汤玉生 实现注入电荷驱动的微泵芯片结构

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Cited By (32)

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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
WO2006111775A1 (fr) * 2005-04-22 2006-10-26 The Technology Partnership Plc Pompe
WO2007115740A2 (fr) * 2006-04-06 2007-10-18 Bartels Mikrotechnik Gmbh Procédé et dispositif de convoyage automatisé de liquides ou de gaz
WO2007115740A3 (fr) * 2006-04-06 2007-11-29 Bartels Mikrotechnik Gmbh Procédé et dispositif de convoyage automatisé de liquides ou de gaz
US9227000B2 (en) 2006-09-28 2016-01-05 Smith & Nephew, Inc. Portable wound therapy system
US10130526B2 (en) 2006-09-28 2018-11-20 Smith & Nephew, Inc. Portable wound therapy system
US9642955B2 (en) 2006-09-28 2017-05-09 Smith & Nephew, Inc. Portable wound therapy system
US11141325B2 (en) 2006-09-28 2021-10-12 Smith & Nephew, Inc. Portable wound therapy system
US12029549B2 (en) 2007-12-06 2024-07-09 Smith & Nephew Plc Apparatus and method for wound volume measurement
WO2010139916A1 (fr) * 2009-06-03 2010-12-09 The Technology Partnership Plc Pompe à disque pour fluides
US8821134B2 (en) 2009-06-03 2014-09-02 The Technology Partnership Plc Fluid disc pump
US11534540B2 (en) 2010-09-20 2022-12-27 Smith & Nephew Plc Pressure control apparatus
US11623039B2 (en) 2010-09-20 2023-04-11 Smith & Nephew Plc Systems and methods for controlling operation of a reduced pressure therapy system
US11027051B2 (en) 2010-09-20 2021-06-08 Smith & Nephew Plc Pressure control apparatus
US9084845B2 (en) 2011-11-02 2015-07-21 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US11648342B2 (en) 2011-11-02 2023-05-16 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US10143783B2 (en) 2011-11-02 2018-12-04 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US11253639B2 (en) 2011-11-02 2022-02-22 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US10087923B2 (en) 2012-02-10 2018-10-02 The Technology Partnership Plc. Disc pump with advanced actuator
WO2013117945A1 (fr) 2012-02-10 2013-08-15 The Technology Partnership Plc Pompe à disque avec actionneur avancé
EP3660308A1 (fr) 2012-03-07 2020-06-03 KCI Licensing, Inc. Pompe à disque à deux cavités
WO2013134056A1 (fr) 2012-03-07 2013-09-12 Kci Licensing, Inc. Pompe à disques avec actionneur avancé
US10702418B2 (en) 2012-05-15 2020-07-07 Smith & Nephew Plc Negative pressure wound therapy apparatus
US9545465B2 (en) 2012-05-15 2017-01-17 Smith & Newphew Plc Negative pressure wound therapy apparatus
US9427505B2 (en) 2012-05-15 2016-08-30 Smith & Nephew Plc Negative pressure wound therapy apparatus
US10299964B2 (en) 2012-05-15 2019-05-28 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
US10780202B2 (en) 2014-12-22 2020-09-22 Smith & Nephew Plc Noise reduction for negative pressure wound therapy apparatuses
US10737002B2 (en) 2014-12-22 2020-08-11 Smith & Nephew Plc Pressure sampling systems and methods for negative pressure wound therapy
US10682446B2 (en) 2014-12-22 2020-06-16 Smith & Nephew Plc Dressing status detection for negative pressure wound therapy
US11654228B2 (en) 2014-12-22 2023-05-23 Smith & Nephew Plc Status indication for negative pressure wound therapy
WO2022023703A1 (fr) 2020-07-31 2022-02-03 Ttp Ventus Ltd. Actionneur pour une pompe acoustique résonante

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DE602004019419D1 (de) 2009-03-26
CN1813133A (zh) 2006-08-02
ATE422614T1 (de) 2009-02-15
CN100430599C (zh) 2008-11-05

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