EP0070279B1 - Von hochdruckgas getriebener schallstrahler - Google Patents

Von hochdruckgas getriebener schallstrahler Download PDF

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Publication number
EP0070279B1
EP0070279B1 EP81902856A EP81902856A EP0070279B1 EP 0070279 B1 EP0070279 B1 EP 0070279B1 EP 81902856 A EP81902856 A EP 81902856A EP 81902856 A EP81902856 A EP 81902856A EP 0070279 B1 EP0070279 B1 EP 0070279B1
Authority
EP
European Patent Office
Prior art keywords
fluidistor
resonator
sound emitter
horn
sound
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP81902856A
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English (en)
French (fr)
Other versions
EP0070279A1 (de
Inventor
Marek Werthajm
Tommy JÖNSSON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KOCKUMATION AB
Original Assignee
KOCKUMATION AB
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Filing date
Publication date
Application filed by KOCKUMATION AB filed Critical KOCKUMATION AB
Priority to AT81902856T priority Critical patent/ATE18723T1/de
Publication of EP0070279A1 publication Critical patent/EP0070279A1/de
Application granted granted Critical
Publication of EP0070279B1 publication Critical patent/EP0070279B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K5/00—Whistles

Definitions

  • the invention relates to a sound emitter for generating sound of a predetermined frequency, which is driven by pressurized gas and has a resonator horn and means for controlling the emission of pressurized gas through the resonator horn while providing sound oscillations substantially at said predetermined frequency.
  • the most common sound emitter of this type for use as an alarm siren, a signal apparatus at sea and in industry, e.g. for fluidizing slow- moving material and for sonic cleaning of furnaces and the like, is the well-known sound emitter of the diaphragm valve type wherein a diaphragm in co-operation with a seat controls the emission of the pressurized gas through the resonator horn.
  • a sound emitter of this type is shown e.g.
  • the object of the invention is to provide a sound emitter of the type referred to above which completely in lacks a diaphragm or other movable component for controlling the emission of the pressurized gas through the resonator horn, and this object is achieved by a sound emitter as characterised in claim 1.
  • US-A-3237 712 discloses a fluid-operated acoustic device ' but this device has no resonator horn with a substantially equal impedance member.
  • US-A-3 111 931 relates to a sonic generator having horns which are closed with diaphragms and hence have a fluid return.
  • US-A-4 194 095 describes a loudspeaker with horns which are controlled by valves.
  • the sound emitter of the invention can be made of a small number of elements (three or four pieces) and as a consequence thereof will be cheap in manufacture and requires low maintenance and limited storage of spare parts, because the fluidistor has no moving elements and is practically impossible to wear out.
  • the sound emitter in FIG. 1 comprises a power fluidistor 10 having a straight inlet passage 11 to be connected to a pressure gas source, including not only a source of pressurized gas but also a . source of pressurized gas mixture (such as air) or steam.
  • the fluidistor has two outlet branches 12 and 13 forming a certain angle with each other and separated by a sharp edge 14 in the conventional manner.
  • a resonator horn 15 communicating with the surrounding air is connected to one of said outlet branches while the other outlet branch is connected to a tubular member 16 communicating with the surrounding air and forming a tuned restriction such that said member has substantially the same acoustic input impedance as the resonator horn.
  • the power fluidistor operates according to the wall effect (Coanda effect) and when pressurized gas is supplied to the inlet passage 11 there is formed at the transition from the inlet passage to the two outlet branches 12 and 13 at the sharp edge 14 between said branches a vortex providing a subatmospheric pressure.
  • the fluidistor in itself .is bistable but due to the connection of the resonator horn 15 the air will be directed alternately to one and the other of the two outlet branches at a frequency determined by the volume of the passage (the resonator horn) connected to the outlet branch 12, and thus the fluidistor in this case operates as a self-oscillating fluidistor controlled by the acoustic impedance of the resonator horn 15, the oscillations generated being amplified in the horn.
  • the fluidistor may be arranged for positive control by means of a separate self-oscillating control fluidistor of a conventional type. This is shown in FIG. 2 wherein the fluidistor 10 is provided with two control nozzles 17 and 18 connected to the outlet branches of the control fluidistor 19.
  • the resonator horn in this case should have a resonance frequency which substantially equals the frequency at which the power fluidistor 10 oscillates under the control of the self-oscillating control fluidistor 19.
  • One and the same control fluidistor can be provided to control several sound emitters.
  • FIG. 3 also discloses a self-oscillating power fluidistor but in this case the fluidistor is rendered self-oscillating by a control passage or "control resonator" 20 being provided between the two control nozzles 17 and 18.
  • control resonator The volume of the control passage in co-operation with the resonator horn 15 determines the oscillation frequency of the fluidistor.
  • FIG. 4 Another manner in which the power fluidistor 10 can be made self-oscillating is disclosed in FIG. 4 wherein the two control nozzles 17 and 18 are connected by passages or conduits 21 and 22 to the outlet branch 13 and the outlet branch 12, respectively.
  • the two control nozzles 17 and 18 are connected by passages or conduits 21 and 22 to the outlet branch 13 and the outlet branch 12, respectively.
  • FIG. 5 discloses a further manner for controlling the power fluidistor 10.
  • one control nozzle 17 is replaced by a cavity 23 and control air is supplied to said cavity through the other control nozzle 18.
  • control air is supplied to said cavity through the other control nozzle 18.
  • the embodiment according to FIG. 6 is a further modification of the means for controlling the fluidistor.
  • the member 16 is connected to the neck of the horn 15 and thus opens into the horn to communicate with the surrounding atmosphere through the horn. It is constructed with such a length that there is obtained a phase shift between the air flow through the horn and the air flow through the member 16 in order to double the pressure in the resonator horn.
  • the member 16 is also connected to the neck of the resonator horn 15 opposite to an outlet 24 from the neck of the resonator horn in order to provide thereby a pressure decrease in the resonator horn by ejector action, a self-oscillation of the fluidistor 10 also being obtained thereby.
  • the member 16 can be replaced by a further resonator horn 15' as is shown in FIG. 8.
  • the resonator horns are identical.
  • the drawback of the arrangement of two horns in this way is that the sound wave from one horn will be in opposition to the phase of the sound wave from the other horn.
  • the sound waves may be brought into phase with each other.
  • the power fluidistor has been shown to be of the flat type but it can advantageously be constructed also as a cylindric fluidistor and generally be of the several embodiments existing in the general fluidistor technique because the fluidistor as such forms no part of the invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Claims (10)

1. Schallstrahler zur Erzeugung eines Schalls einer vorbestimmten Frequenz, der durch Druckgas getrieben wird und ein Resonanzhorn (15) und eine Einrichtung (10) zur Regelung der Emission des Druckgases durch das Resonanzhorn hat, während Schallschwingungen im wesentlichen an der genannten vorbestimmten Frequenz erzeugt werden, dadurch gekennzeichnet, dass das Resonanzhorn (15) an den einen Auslass (12) eines Fluidspeichers (10) verbunden ist, der die Regeleinrichtung bildet, und dass der andere Auslass (13) des Fluidspeichers mit der umgebenden Luft durch ein abgestimmtes Teil (16, 15) verbunden ist, das eine akustische Eingangsimpedanz hat, dessen Grösse im wesentlichen der akustischen Eingangsimpedanz des Resonanzhorns gleicht.
2. Schallstrahler nach Anspruch 1, dadurch gekennzeichnet, dass der Fluidspeicher (10) Regeldüsen (17,18) hat, die an einen Regelfluidspeicher (19) mit Eigenschwingung verbunden sind (Fig. 2).
3. Schallstrahler nach Anspruch 1, dadurch gekennzeichnet, dass der Fluidspeicher (10) einen Kraftfluidspeicher mit Eigenschwingung umfasst (Fig. 3).
4. Schallstrahler nach Anspruch 3, dadurch gekennzeichnet, dass die Frequenz der Eigenschwingung des Fluidspeichers (10) durch das Resonanzhorn (15) bestimmt ist (Fig. 1).
5. Schallstrahler nach Anspruch 3, dadurch gekennzeichnet, dass der Fluidspeicher (10) Regeldüsen (17, 18) hat, die mit dem Resonanzhorn (15) bzw. dem abgestimmten Teil quergeschaltet sind (Fig. 4).
6. Schallstrahler nach Anspruch 3, dadurch gekennzeichnet, dass der Fluidspeicher (10) nur eine Regeldüse (18) hat, und dass ein Hohlraum (23) an der Seite des Einlassdurchganges (11) des Fluidspeichers vorgesehen ist, der zur Regeldüse entgegengesetzt angeordnet ist (Fig. 5).
7. Schallstrahler nach Anspruch 3, dadurch gekennzeichnet, dass die Auslassende des abgestimmten Teils (16) mit dem Hals des Resonanzhorns (15) verbunden ist (Fig. 6).
8. Schallstrahler nach Anspruch 7, dadurch gekennzeichnet, dass der Seitenauslass (24) mit dem Hals des Resonanzhorns entgegengesetzt zur Auslassende des abgestimmten Teils (16) verbunden ist.
9. Schallstrahler nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das abgestimmte Teil, das mit dem anderen Auslass (13) verbunden ist, ein zweites Resonanzhorn (15') umfasst (Fig. 8).
10. Schallstrahler nach Anspruch 9, dadurch gekennzeichnet, dass eines der zwei Resonanzhörner (15, 15') in 180° relativer Phasenverschie-' bung der Schallwellen aus den Resonanzhörnern angeordnet ist (Fig. 9).
EP81902856A 1980-10-17 1981-10-15 Von hochdruckgas getriebener schallstrahler Expired EP0070279B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81902856T ATE18723T1 (de) 1980-10-17 1981-10-15 Von hochdruckgas getriebener schallstrahler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8007294 1980-10-17
SE8007294A SE428346B (sv) 1980-10-17 1980-10-17 Tryckgasdriven ljudsendare med resonanshorn och med organ for styrning av tryckgasens avgivning genom resonanshornet

Publications (2)

Publication Number Publication Date
EP0070279A1 EP0070279A1 (de) 1983-01-26
EP0070279B1 true EP0070279B1 (de) 1986-03-26

Family

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EP81902856A Expired EP0070279B1 (de) 1980-10-17 1981-10-15 Von hochdruckgas getriebener schallstrahler

Country Status (4)

Country Link
EP (1) EP0070279B1 (de)
JP (1) JPS57501749A (de)
SE (1) SE428346B (de)
WO (1) WO1982001329A1 (de)

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US7148879B2 (en) 2000-07-06 2006-12-12 At&T Corp. Bioacoustic control system, method and apparatus
US8908894B2 (en) 2011-12-01 2014-12-09 At&T Intellectual Property I, L.P. Devices and methods for transferring data through a human body
US10108984B2 (en) 2013-10-29 2018-10-23 At&T Intellectual Property I, L.P. Detecting body language via bone conduction
US9594433B2 (en) 2013-11-05 2017-03-14 At&T Intellectual Property I, L.P. Gesture-based controls via bone conduction
US10678322B2 (en) 2013-11-18 2020-06-09 At&T Intellectual Property I, L.P. Pressure sensing via bone conduction
US9349280B2 (en) 2013-11-18 2016-05-24 At&T Intellectual Property I, L.P. Disrupting bone conduction signals
US9715774B2 (en) 2013-11-19 2017-07-25 At&T Intellectual Property I, L.P. Authenticating a user on behalf of another user based upon a unique body signature determined through bone conduction signals
US9405892B2 (en) 2013-11-26 2016-08-02 At&T Intellectual Property I, L.P. Preventing spoofing attacks for bone conduction applications
US9882992B2 (en) 2014-09-10 2018-01-30 At&T Intellectual Property I, L.P. Data session handoff using bone conduction
US10045732B2 (en) 2014-09-10 2018-08-14 At&T Intellectual Property I, L.P. Measuring muscle exertion using bone conduction
US9589482B2 (en) 2014-09-10 2017-03-07 At&T Intellectual Property I, L.P. Bone conduction tags
US9582071B2 (en) 2014-09-10 2017-02-28 At&T Intellectual Property I, L.P. Device hold determination using bone conduction
US9600079B2 (en) 2014-10-15 2017-03-21 At&T Intellectual Property I, L.P. Surface determination via bone conduction
US10831316B2 (en) 2018-07-26 2020-11-10 At&T Intellectual Property I, L.P. Surface interface

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1530899A (en) * 1923-07-24 1925-03-24 Limon Francois Whistle operated by steam or compressed gas and intended for use upon railroads or for navigation, aviation, or like purposes
SE193387C1 (de) * 1964-01-01
DE1235775B (de) * 1965-11-13 1967-03-02 M A N Turbo G M B H Lippenpfeife
US3416487A (en) * 1966-03-22 1968-12-17 Green Eng Co Method and apparatus for generating and applying sonic energy
DE1433147A1 (de) * 1961-04-08 1969-01-09 Bowles Ronald Edward Stroemungssystem
US3850135A (en) * 1973-02-14 1974-11-26 Hughes Tool Co Acoustical vibration generation control apparatus
US3911858A (en) * 1974-05-31 1975-10-14 United Technologies Corp Vortex acoustic oscillator
US3942468A (en) * 1973-09-24 1976-03-09 Kockums Mekaniska Verkstads Aktiebolag Back pressure operated sound transmitter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111931A (en) * 1960-03-31 1963-11-26 Albert G Bodine Oscillatory fluid stream driven sonic generator with elastic autoresonator
DE1181591B (de) * 1963-02-01 1964-11-12 Siemens Ag Pneumatisch oder hydraulisch betaetigte optische oder akustische Signaleinrichtung
GB1145727A (en) * 1966-06-06 1969-03-19 Imp Riv Srl Alarm systems
FR1531690A (fr) * 1967-05-25 1968-07-05 Commissariat Energie Atomique Générateurs acoustiques
US3701334A (en) * 1970-09-14 1972-10-31 Bendix Corp Annular slot proportional jet amplifier for a fluidic sound generator
JPS5936480B2 (ja) * 1976-02-10 1984-09-04 ソニー株式会社 スピ−カ装置
FR2442565A1 (fr) * 1978-11-24 1980-06-20 Bertin & Cie Procede d'amplification acoustique fluide et haut parleur pneumatique de mise en oeuvre de ce procede

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE193387C1 (de) * 1964-01-01
US1530899A (en) * 1923-07-24 1925-03-24 Limon Francois Whistle operated by steam or compressed gas and intended for use upon railroads or for navigation, aviation, or like purposes
DE1433147A1 (de) * 1961-04-08 1969-01-09 Bowles Ronald Edward Stroemungssystem
DE1235775B (de) * 1965-11-13 1967-03-02 M A N Turbo G M B H Lippenpfeife
US3416487A (en) * 1966-03-22 1968-12-17 Green Eng Co Method and apparatus for generating and applying sonic energy
US3850135A (en) * 1973-02-14 1974-11-26 Hughes Tool Co Acoustical vibration generation control apparatus
US3942468A (en) * 1973-09-24 1976-03-09 Kockums Mekaniska Verkstads Aktiebolag Back pressure operated sound transmitter
US3911858A (en) * 1974-05-31 1975-10-14 United Technologies Corp Vortex acoustic oscillator

Also Published As

Publication number Publication date
SE428346B (sv) 1983-06-27
SE8007294L (sv) 1982-04-18
WO1982001329A1 (en) 1982-04-29
JPS57501749A (de) 1982-09-24
EP0070279A1 (de) 1983-01-26

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