WO1987004953A1 - Appareil destine a produire specialement des sons a basse frequence - Google Patents

Appareil destine a produire specialement des sons a basse frequence Download PDF

Info

Publication number
WO1987004953A1
WO1987004953A1 PCT/SE1986/000060 SE8600060W WO8704953A1 WO 1987004953 A1 WO1987004953 A1 WO 1987004953A1 SE 8600060 W SE8600060 W SE 8600060W WO 8704953 A1 WO8704953 A1 WO 8704953A1
Authority
WO
WIPO (PCT)
Prior art keywords
aperture
space
drive unit
chamber
frequency
Prior art date
Application number
PCT/SE1986/000060
Other languages
English (en)
Inventor
Marek Werthajm
Original Assignee
Kockum Sonics Ab
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 Kockum Sonics Ab filed Critical Kockum Sonics Ab
Publication of WO1987004953A1 publication Critical patent/WO1987004953A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/20—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of a vibrating fluid

Definitions

  • the present invention relates to an apparatus for generating in particular low-frequency sound, comprising a drive unit which is adapted to generate sound by the supply of compressed air, and an open resonator which is connected to said drive unit and preferably is in the form of a straight pipe.
  • the low-frequency generators normally are of the pneumatic type, the frequency generation being integrated with the oscillator (the diaphragm) and the frequency control being integrated with the horn.
  • the sound transmitter is self-adjusting and operate on the system's own resonance frequency, and the frequenc cannot be changed.
  • Existing pneumatic sound transmitters with controlled frequency are highly sophisticated.
  • the air supply valve conforms slavishly to changes of optiona signals. The control is, so to speak, an "analog" control. Coupling in parallel of such known devices may result in phase shifts reducing the efficiency. It may also happen that entire systems or at least parts thereof are subjected to heavy resonant vibration.
  • the drive unit comprises a housing having a chamber with an aperture opening in the resonator, a member oscillating within said chamber and having a first actuating surface which is located within a first space of said chamber and by means of which said member is movable, by supply of compressed air to said first space, in a direction away from said aperture, such that said aperture is opened, and a second actuating surface which is located in a second space and by means of which said body is movable, by supply of compressed air to said second space, in a direction toward said aperture, such that said aperture is closed, that said second actuating surface has a larger area than said first surface, and that said second space communicates with the atmosphere via a passage which is opened and closed by means of an electrically operated valve.
  • Fig. 1 is a lateral view, partly in section, of an apparatus designed in accordance with the invention and adapted to generate low-frequency sound
  • Fig. 2 illustrates a modified embodiment of such an apparatus
  • Fig. 3 illustrates how a number of apparatuses according to the invention can be coupled in parallel for cleaning the combustion space of a furnace
  • the apparatus according to the invention as illus ⁇ trated in Fig. 1 comprises a drive unit generally de- signated 10 and having means for generating low-frequency sound.
  • a resonator 11 Connected to said drive unit 10 is a resonator 11 which may have any shape suitable in the context, for example flaring exponentially, although it preferably is in the form of a straight pipe.
  • the drive unit 10 has a chamber 12 which is connected to the resonator 11 via a duct or aperture 13.
  • the chamber 12 houses an approximately cylindrical member 14 provided at one end with a sealing means 15 which, in Fig. 1, has its slightly raised peripheral edge engaging a portion around the aperture 13. Nearest the sealing means 15, the member 14 has a smaller cross-sectional area than the chamber 12, such that a first space 16 is formed.
  • the member 14 widens to the cross- sectional area of the chamber by means of an inclined annular portion 35 forming an actuating surface.
  • the cylindrical member terminates at a distance from the rear end of the chamber 12 to form a second space 17, and it appears that the side of the member 14 facing the space 17 has a much larger area than the transitional portion 35.
  • the member 14 is provided in its rear side with a bore housing a spring 19 which strives to urge the member 14 toward the aperture 13.
  • Extending between said first space 16 and said second space 17 is a duct 18 having a relatively small cross-sectional area and opening in the bore of the member 14.
  • valve 21 In the rear side of the drive unit 10, which is constituted by a removable lid, two passages 20, 22 are provided, the first of which extends from the space 17 and opens in a cavity in a valve 21 mounted on said drive unit 10. This cavity of the valve 21 communicates with the atmosphere through the second passage 22.
  • the valve 21 is a solenoid valve having a coil 23 which is connected to a current source by means of wires 24 and within which an armature 26 is movable back and forth in conventional manner in response to the activation of the coil 23.
  • the armature 26 is connected with a valve member 25 which, in its advanced position, closes the entrance to the passage 22 communicating with the atmosphere. It will be seen that, by displacing the valve member 25, the communication between the space 17 and the atmosphere is opened and closed.
  • va-lve 21 is but schematically shown and may be re ⁇ placed by other valves; the important thing is that the communication between the space 17 and the atmosphere can be opened and closed electrically at the desired frequency.
  • a transverse bore provided in the drive unit 10 and opening in the space 16 houses a connection 27 for connecting a compressed air line 29 to said drive unit 10.
  • Sound is generated by the apparatus according to Fig. 1 by supplying compressed air to the drive unit 10 via the line 29 and the connection 27.
  • the compressed air first enters the space 16 and then goes to the space 17 via the duct 18 and the bore. Since the compressed air acts on a much larger area of the rear side of the member 14 than on the front side of said member, and since this force furthermore is supported by the force of the spring 19, the member 14 will be held with the seal 15 in engagement around the aperture 13 ' , as shown in Fig. 1.
  • valve member 25 If an electric voltage is applied to the coil 23 which thus moves ' the armature 26 away from the drive unit 10, the valve member 25 is lifted from its seat surface, thereby exposing the opening of the passage 22 in the valve cavity so that the space 17 will com ⁇ municate with the atmosphere via the passages 20, 22. As a result, the pressure in the space 17 is reduced, and by the action of the compressed air on the actuating surface 35 the member 14 is moved to the right in Fig. 1, whereby the aperture 13 is opened toward the chamber 12. When the valve member 25 again closes the passage 22, the pressure in the space 17 is again built up so that the member 14 is moved to the left in Fig. 1 and the aperture 13 is closed.
  • This movement of the member 14 in the drive unit 10 generates the low-frequency sound which is amplified by the resonator 11.
  • the reciprocating movement of the member 14 is controlled bf means of the valve member 25 whose movement is dependent .upon the movement of the armature 26 and, thus, by the activation of the coil 23.
  • the movement of the member 14 and thus the frequency of the sound generated may be readily controlled- electrically by connecting the lines 24 of the coil 23 to a suitable current source which is capable of supplying pulses of a frequency readily adjustable, preferably a square wave voltage.
  • Fig. 2 illustrates a modified embodiment of the drive unit, a diaphragm 14 forming the reciprocable member.
  • annular ridge 28 is provided around the aperture 13 to the resonator 11, and this ridge is engaged by one side of the diaphragm 14 in the state corresponding to the one shown in Fig. 1.
  • the space 16 is formed by the annular space between the ridge 28 and the periphery of the diaphragm 14, and the space 16 communicates with the space 17 on the rear side of the diaphragm 14 via the duct 18 which here is formed in the diaphragm proper.
  • the dia ⁇ phragm 14 is mounted such that it engages the ridge without actuation by compressed air, and when compressed air is supplied via the passage 29 and the connection 27, the air will flow, as in the embodiment previously described, into the space 16 and from there via the duct 18 into the space 17 which is vented in the same manner as in the earlier embodiment, the diaphragm 14 being urged away from the ridge 28 by the compressed air in the space 16.
  • the resonator preferably is a straight pipe 11 because this will give a resonance curve having a relatively wide peak. If, on the other hand, the horn flares exponentially or in accordance with a Bessel curve, the degree of efficiency will be affected, and the resonance curve will be far more narrow.
  • the resonance frequency is determined by the length of the horn.
  • the horns With low frequencies, the horns must be of considerable lengths and therefore may be curved, for example helically.
  • the horns may also comprise several different sections, such as straight pipes with conical sections . Since the apparatus according to the invention can ' be controlled with the greatest ease, a plurality of apparatuses may be readily coupled in parallel without causing phase difficulties. If a plurality of apparatuses are coupled in synchronism (in phase), a considerable sound amplification may be achieved. Fig.
  • FIG. 3 illustrates an arrangement in which a combustion chamber 30 in a boiler is cleaned by means of several apparatuses according to the invention coupled in parallel and provided with a resonator 11 in the form of a long straight pipe projecting into the space 30 with its end facing away from the drive unit 10.
  • the drive units 10 of the apparatuses are connected to a compressed air line 29 and to a control wire 24 which is connected to a current source 31.
  • the current source 31 produces a square wave voltage of readily controlled frequency, as indicated at 32. It is also possible to provide on a resonator 11 a sensor 34 which senses the resonance frequency of the resonator and is connected, via a wire 33, to the current source 31 for automatic control of the frequency of the square wave voltage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Exhaust Silencers (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

Un appareil, destiné à produire spécialement des sons à basse fréquence, comprend une unité d'attaque (10) et un résonateur ouvert (11) relié à ladite unité (10). Celle-ci comprend un logement muni d'un élément mobile (14) ouvrant et fermant une ouverture (13), dont est pourvu ledit logement et qui s'ouvre dans ledit résonateur (11). Ledit élément (14) fonctionne à l'air comprimé, son actionnement étant commandé par une soupape (2) commandée par impulsion électrique provenant d'une source de courant, la fréquence desdites impulsions étant régulée de façon manuelle ou automatique. Pour le retrait de la suie se trouvant dans des fourneaux, plusieurs appareils de ce type peuvent être couplés en parallèle à une source de courant commune, de façon à fonctionner en phase et à produire une amplification acoustique considérable.
PCT/SE1986/000060 1985-01-16 1986-02-14 Appareil destine a produire specialement des sons a basse frequence WO1987004953A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8500188A SE451115B (sv) 1985-01-16 1985-01-16 Anleggning for sotning av pannor eller liknande, innefattande ett flertal lagfrekvent ljud alstrande anordningar

Publications (1)

Publication Number Publication Date
WO1987004953A1 true WO1987004953A1 (fr) 1987-08-27

Family

ID=20358780

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1986/000060 WO1987004953A1 (fr) 1985-01-16 1986-02-14 Appareil destine a produire specialement des sons a basse frequence

Country Status (5)

Country Link
EP (1) EP0189386B1 (fr)
AT (1) ATE56640T1 (fr)
DE (1) DE3674219D1 (fr)
SE (1) SE451115B (fr)
WO (1) WO1987004953A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5461123A (en) 1994-07-14 1995-10-24 Union Carbide Chemicals & Plastics Technology Corporation Gas phase fluidized bed polyolefin polymerization process using sound waves
FR2757784B1 (fr) * 1996-12-27 1999-01-29 Bp Chemicals Snc Procede de traitement au moyen de vibrations de la paroi d'un reacteur a lit fluidise de polymerisation en phase gazeuse
EP3091415B1 (fr) 2013-08-16 2018-08-01 Kevin Allan Dooley Inc. Systèmes et procédés de commande de pressions à infrasons
US10048151B2 (en) 2013-08-16 2018-08-14 Kevin Allan Dooley, Inc. Systems and methods for control of motion sickness within a moving structure due to infrasound pressures

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191109364A (en) * 1910-04-18 1912-01-11 Etablissements Gaumont An Improved Fluid Pressure Relay for Amplifying Sounds.
FR774990A (fr) * 1934-05-04 1934-12-17 Avertisseur sonore
US3053031A (en) * 1959-10-19 1962-09-11 Pangborn Corp Sonic cleaning of dust filters
FR1443257A (fr) * 1965-05-07 1966-06-24 Perfectionnements aux vannes
US3394532A (en) * 1963-11-18 1968-07-30 Buhler Maschinenfabrik Geb Pneumatic dust extraction plant
SE391458B (sv) * 1974-05-02 1977-02-21 Svenska Flaektfabriken Ab Sett och anordning for att rensa slangfilter med tryckpulser av rensmedium
GB1472568A (en) * 1973-08-24 1977-05-04 Osborn Mfg Corp Pneumatic vibrator
US4120699A (en) * 1974-11-07 1978-10-17 Alvin B. Kennedy, Jr. Method for acoustical cleaning
WO1979001019A1 (fr) * 1978-05-02 1979-11-29 Kockums Automation Procede de nettoyage sonique
SE414454B (sv) * 1975-05-05 1980-08-04 Buehler Ag Geb Spolluftventil for rengoring av filterkapor
WO1980002887A1 (fr) * 1979-06-11 1980-12-24 Kockumation Ab Amelioration aux generateurs d'oscillations de pression actionnes par un gaz, du type a soupape a diaphragme
EP0043417A2 (fr) * 1980-07-05 1982-01-13 Degussa Aktiengesellschaft Procédé pour la purification de tissus filtrants au moyen d'impulsion de gaz comprimé lors de séparation de particules solides à partir de gaz
SE421871B (sv) * 1979-07-03 1982-02-08 Kockumation Ab Pneumatisk membranventilpulsator
SE425597B (sv) * 1980-10-13 1982-10-18 Ekstroms Vermetekniska Ab Tvangsstyrd ljudalstrare for infraljudomradet
SE426914B (sv) * 1977-07-15 1983-02-21 Buehler Ag Geb Motspolningsforfarande, serskilt for slangfilter for filtrering av dammbemengd luft samt filter med motspolning

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022039A (en) * 1958-12-22 1962-02-20 Gates Rubber Co Diaphragm for valve
EP0006833B1 (fr) * 1978-07-03 1983-09-14 Mats Olsson Konsult Ab Générateur de sons basse fréquence
DE3163878D1 (en) * 1980-07-25 1984-07-05 Kockumation Ab Fluid operated pressure oscillation generator

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191109364A (en) * 1910-04-18 1912-01-11 Etablissements Gaumont An Improved Fluid Pressure Relay for Amplifying Sounds.
FR774990A (fr) * 1934-05-04 1934-12-17 Avertisseur sonore
US3053031A (en) * 1959-10-19 1962-09-11 Pangborn Corp Sonic cleaning of dust filters
US3394532A (en) * 1963-11-18 1968-07-30 Buhler Maschinenfabrik Geb Pneumatic dust extraction plant
FR1443257A (fr) * 1965-05-07 1966-06-24 Perfectionnements aux vannes
GB1472568A (en) * 1973-08-24 1977-05-04 Osborn Mfg Corp Pneumatic vibrator
SE391458B (sv) * 1974-05-02 1977-02-21 Svenska Flaektfabriken Ab Sett och anordning for att rensa slangfilter med tryckpulser av rensmedium
US4120699A (en) * 1974-11-07 1978-10-17 Alvin B. Kennedy, Jr. Method for acoustical cleaning
SE414454B (sv) * 1975-05-05 1980-08-04 Buehler Ag Geb Spolluftventil for rengoring av filterkapor
SE426914B (sv) * 1977-07-15 1983-02-21 Buehler Ag Geb Motspolningsforfarande, serskilt for slangfilter for filtrering av dammbemengd luft samt filter med motspolning
WO1979001019A1 (fr) * 1978-05-02 1979-11-29 Kockums Automation Procede de nettoyage sonique
WO1980002887A1 (fr) * 1979-06-11 1980-12-24 Kockumation Ab Amelioration aux generateurs d'oscillations de pression actionnes par un gaz, du type a soupape a diaphragme
SE421871B (sv) * 1979-07-03 1982-02-08 Kockumation Ab Pneumatisk membranventilpulsator
EP0043417A2 (fr) * 1980-07-05 1982-01-13 Degussa Aktiengesellschaft Procédé pour la purification de tissus filtrants au moyen d'impulsion de gaz comprimé lors de séparation de particules solides à partir de gaz
SE425597B (sv) * 1980-10-13 1982-10-18 Ekstroms Vermetekniska Ab Tvangsstyrd ljudalstrare for infraljudomradet

Also Published As

Publication number Publication date
SE8500188L (sv) 1986-07-17
SE8500188D0 (sv) 1985-01-16
ATE56640T1 (de) 1990-10-15
EP0189386A2 (fr) 1986-07-30
EP0189386B1 (fr) 1990-09-19
EP0189386A3 (en) 1987-11-19
DE3674219D1 (de) 1990-10-25
SE451115B (sv) 1987-09-07

Similar Documents

Publication Publication Date Title
EP0006833B1 (fr) Générateur de sons basse fréquence
US5145355A (en) Apparatus for active monitoring of combustion instability
US4829626A (en) Method for controlling a vacuum cleaner or a central vacuum cleaner
US5414406A (en) Self-tuning vehicle horn
EP0787935A3 (fr) Un dispositif de generation d'un courant d'air de vibration pulsatoire
EP0189386B1 (fr) Appareil pour engendrer un son en particulier de basse fréquence
EP0070279B1 (fr) Emetteur sonore excite par un gaz sous pression
US5109212A (en) Electronically controlled horn for motor vehicles
JPH11179310A (ja) 音波式スートブロワ
JP2610184B2 (ja) 正フィードバック系を具えた空気駆動式低周波音発生器
JPS63124095A (ja) 共振周波数を測定するセンサにより電子的に制御される音響ダイアフラムの励振による電気機械式ホ−ン
JPH04224305A (ja) ガス圧アクチュエータ
US3534754A (en) Transducer
JPH11223328A (ja) 音波式スートブロワ
GB2165062A (en) Optically controlled actuator
US3549117A (en) Vibration controlled valve and system
US2191825A (en) Electropneumatic signal device
SU1662869A1 (ru) Воздухоподвод ща головка муфты включени кузнечно-прессовой машины
EP2578935A2 (fr) Procédé et systèmes de nettoyage par ondes acoustiques
US7292136B2 (en) Audible signal device and machines using same
GB2150731A (en) Air powered sound source
RU1801909C (ru) Устройство дл очистки стенок транспортных средств от примерзшего сыпучего материала
WO2019191074A1 (fr) Compensation de température pour sondeur piézoélectrique
KR100398418B1 (ko) 음파의 주파수 가변기능을 구비한 음파탈진기
JPS6440778A (en) Flow control valve

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP KR US