EP0069741B1 - Positively controlled sound generator - Google Patents

Positively controlled sound generator Download PDF

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Publication number
EP0069741B1
EP0069741B1 EP81902814A EP81902814A EP0069741B1 EP 0069741 B1 EP0069741 B1 EP 0069741B1 EP 81902814 A EP81902814 A EP 81902814A EP 81902814 A EP81902814 A EP 81902814A EP 0069741 B1 EP0069741 B1 EP 0069741B1
Authority
EP
European Patent Office
Prior art keywords
pressure gas
sound
gas line
valve sleeve
valve
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
EP81902814A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0069741A1 (en
Inventor
Per Börje FRANSMAN
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.)
Ekstroms Varmetekniska AB
Original Assignee
Ekstroms Varmetekniska 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 Ekstroms Varmetekniska AB filed Critical Ekstroms Varmetekniska AB
Priority to AT81902814T priority Critical patent/ATE18515T1/de
Publication of EP0069741A1 publication Critical patent/EP0069741A1/en
Application granted granted Critical
Publication of EP0069741B1 publication Critical patent/EP0069741B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • G10K7/00—Sirens
    • G10K7/02—Sirens in which the sound-producing member is rotated manually or by a motor

Definitions

  • This invention refers to a sound generator for the infra sound range for regulated delivery of pressure gas pulses from a pressure gas line to a resonator comprising a resonance tube, the length of which substantially corresponds to one fourth of a wavelength of the sound generated in said sound generator, for keeping boilers or the like clean.
  • EP-A2-0 006 833 discloses a low-frequency sound generator comprising a resonance tube for keeping boilers or the like clean, said sound generator utilizing a movable valve slide member for generating the relevant sound.
  • DE-A-2 262 948 illustrates a sound producer for delivery of pressure gas pulses from a pressure gas line to a resonator.
  • This sound producer comprises a valve member which is connected to a prime mover for being driven thereby so as to control the delivery of the pressure gas pulses from the pressure gas line.
  • the valve member consists of a valve sleeve which is coaxially disposed on the pressure gas line and is rotatably mounted.
  • the valve sleeve has one or more openings for cooperation with one or more openings in the pressure gas line when the valve sleeve rotates.
  • This sound producer is actually a howl-generating siren, and thus it generates high-frequency sound.
  • the field of utilization of the sound generator according to EP-A-0 006 833 may vary, but as indicated by way of introduction said generator is primarily intended for the clean-keeping of boilers or other spaces through which dust-carrying gas flows.
  • said open end of the resonance tube being connected for example to a boiler it becomes possible to keep dust from being deposited on pipes, walls and channels and in pockets.
  • sound is generated with a high level of intensity, wherein the frequency range of the sound may be varied by speed control so that the highest sound intensity is generated in different frequency ranges in contrast to the case with a so-called feedback system of known type which operates with a predetermined frequency, wherein the pressure gas pulses are supplied to the resonator by the valve device which controls the delivery of the pressure gas pulses from the pressure gas line being controlled by a diaphragm disposed in the resonator (EP-A-0 006 833).
  • Figure 1 shows a side view of a sound generator, comprising the sound generator in accordance with the invention, connected to a resonance tube, said sound generator being disposed for keeping a space clean and being shown with a compressed air system connected to the generator.
  • Figure 2 is an axial sectional view of one end of the sound generator with the sound producer connected thereto, and Figures 3 and 4 are sectional views taken along the line A-A in Figure 2 showing two different variants of the sound producer.
  • the sound generator consists of a resonance tube 1 having an open end 2 and a closed end 3 and a sound producer 4 for positively controlled delivery of pressure gas to the closed end of the resonance tube.
  • the length of the resonance tube corresponds approximately to one quarter of a wavelength of the sound which is to be generated in the sound generator.
  • the sound generator is connected to pressure gas, for example compressed air, through a connector 5, and pressure gas is urged out into the resonance tube in pulses in response to a mechanically controlled valve arrangement in the sound producer, whereby the resonance tube is alternately opened and closed to the pressure gas.
  • the mechanically controlled valve arrangement is driven by means of a drive device 5 which may be electric, hydraulic or pneumatic and which in this particular case is shown in the form of an electric motor.
  • a drive device 5 which may be electric, hydraulic or pneumatic and which in this particular case is shown in the form of an electric motor.
  • the valve arrangement comprises an inlet sleeve 7 connected to the pipe connector 5, said inlet sleeve extending into the closed cylindrical housing 8 of the sound producer 4.
  • the cylindrical housing 8 communicates with the resonance tube 1 and forms the closed end 3 thereof, with the interior of the housing comprising a portion of the interior of the resonance tube.
  • the inlet sleeve 7 extends diametrically through the housing 8 and is disposed at an axial distance from the closed end 3. This distance is dimensioned on the basis of the circumstances in each individual case so that the best possible sound intensity in the frequency range within which the sound generator is to operate will be achieved.
  • a valve sleeve 9 is rotatably mounted on the inlet sleeve by means of ball bearings 10, with a small gap of the magnitude of a few tenths of millimetres existing between the outside of the inlet sleeve 7 and the inside of the valve sleeve 9. In consequence of the mounting being carried out by means of ball bearings necessary lubrication can be provided without oil or grease contacting the air space.
  • the valve sleeve is closed at one end by means of a screwed-on cover 11 and is at its other end connected to the drive flange 12 of the motor 6 by means of pins 13.
  • the valve sleeve 9 has two diametrically opposite openings in the form of axial slits 14 for cooperation with an opening having the form of an axial slit 15 in the inlet sleeve, as is shown in Figure 3, but the valve sleeve can also have one single opening 14' for cooperation with the slit 15, as is shown in Figure 4.
  • the sound producer has an unlimited frequency range as the latter can be selected on the one hand by the slits 14 and the slit 14', respectively, in the valve sleeve and the slit 15 in the inlet sleeve being matched with an appropriate resonator and on the other hand by the speed of the valve sleeve being regulated.
  • boilers can be kept clean by means of frequencies up towards 400 Hz but perhaps still better with frequencies down towards 20Hz. With a correctly matched resonator infra sound far below 20Hz may be generated. No sound having intensity can be generated without a resonator but the invention permits the generation in the sound generator of sounds of high intensity and of different frequencies in the same resonator.
  • the slit 15 should have an area of at least 400 square millimetres, that the width (extension in the circumferential direction of the inlet sleeve 7) of the slit should not be more than 8 millimetres, and that the length (extension in the axial direction of the inlet sleeve 7) of the slit should be between 6 and 25 times the width of the slit.
  • the slit 15 in the inlet sleeve 7 will be alternately opened and closed by means of the valve sleeve 9 when the latter is rotated by means of the motor 6 for delivering thrusts of compressed air to the resonance tube 1, towards the interior of which tube the slit 15 is directed.
  • an air layer is located between the closed portion of the valve sleeve 9 and the inlet sleeve 7, said air layer serving as protection against friction and preventing wear as a result of the materials of the sleeves not touching each other.
  • the layer of air also achieves cooling of the material.
  • air or cooling water can be supplied to the interior of the resonance tube through a conduit 16 if desired.
  • the sound generator is illustrated suspended in a ceiling beam 17 by means of chains or wires 18 which preferably are provided with vibration-damping members, said resonance tube 1 extending through the wall 19 to a space located outside of said wall to be kept clean by the emission of sound of low frequency (infra sound) in the space.
  • the resonance tube should not project further into this space than that the distance to an opposite surface in front of the open end 2 of the resonance tube is at least 0,5 metres such surface being marked out by means of a dot- dash line 20.
  • the tube connector 5 is connected to a compressed air line 21 which at least adjacent to the sound generator consists of flexible tubing connecting the sound producer to an appropriate source of compressed air (a compressor).
  • the compressed air line 21 is provided with a cut-off valve 22, a conventional filter 23, and a magnetic valve 24, across which a narrow shunt line 25 is disposed.
  • the magnetic valve 24 is connected to the power mains over automatic equipment 27 including a timer for opening the magnetic valve 24 at predetermined intervals which are of controllable magnitude and another timer for determining the period during which the magnetic valve is to be kept open on each occasion when it is opened. The magnitude of the last-mentioned period is also controllable.
  • the motor 6 is connected to the power mains over an adjustable regulator 27 which permits the speed of the motor to be set at a desired rate so that the frequency of the sound generated in the sound generator is governed thereby. If desired this regulator may be connected to a sensor which senses the frequency of the generated sound and adjusts the setting of the regulator for retaining the frequency of the sound at a substantially constant level.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
  • Toys (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Stringed Musical Instruments (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP81902814A 1980-10-13 1981-10-13 Positively controlled sound generator Expired EP0069741B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81902814T ATE18515T1 (de) 1980-10-13 1981-10-13 Positiv gesteuerter schallgenerator.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8007150A SE425597B (sv) 1980-10-13 1980-10-13 Tvangsstyrd ljudalstrare for infraljudomradet
SE8007150 1980-10-13

Publications (2)

Publication Number Publication Date
EP0069741A1 EP0069741A1 (en) 1983-01-19
EP0069741B1 true EP0069741B1 (en) 1986-03-12

Family

ID=20341967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81902814A Expired EP0069741B1 (en) 1980-10-13 1981-10-13 Positively controlled sound generator

Country Status (6)

Country Link
EP (1) EP0069741B1 (fi)
DK (1) DK152412C (fi)
FI (1) FI71622C (fi)
NO (1) NO152589C (fi)
SE (1) SE425597B (fi)
WO (1) WO1982001328A1 (fi)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451115B (sv) * 1985-01-16 1987-09-07 Ulveco Kockum Sonic Ab Anleggning for sotning av pannor eller liknande, innefattande ett flertal lagfrekvent ljud alstrande anordningar
SE457822B (sv) * 1986-11-28 1989-01-30 Svenska Rotor Maskiner Ab Foerfarande foer aastadkommande av selektivt styrda tryckpulser i en gasmassa samt anordning foer genomfoerande av foerfarandet
WO1989011042A1 (en) * 1988-05-05 1989-11-16 Birger Pettersson A method for producing pressure pulses in a mass of gas and a device for performing the method
SE462374B (sv) * 1988-06-29 1990-06-18 Infrasonik Ab Reglerstyrd motordriven laagfrekvensljudgenerator
FI972252A (fi) * 1997-05-28 1998-11-29 Ulf Krogars Menetelmä ja laitteisto akustiseen puhdistukseen
FI108810B (fi) * 2000-07-06 2002-03-28 Nirania Ky Laitteisto ja menetelmä polttotapahtuman ja lämmönsiirron tehostamiseksi
SE2130031A1 (en) * 2021-02-02 2022-08-03 Mats Anders Olsson A revolving valve for feeding air pulses to a resonance tube for generating low-frequency sound and a method for feeding these pulses at the resonance frequency of the resonance tube

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1323826A (en) * 1919-12-02 Fed Sign System Siren.
DE245518C (fi) *
DE395023C (de) * 1922-12-10 1924-05-14 Max Maag Tongeber nach Patent 367934 zur Erzeugung von Toenen von unveraenderlicher Tonhoehe
US2407175A (en) * 1939-05-02 1946-09-03 Orlich Peter Echo sounding device
US2634701A (en) * 1948-07-30 1953-04-14 Russell A Gougeon Siren
DE1117923B (de) * 1955-12-16 1961-11-23 Jean Maurice Blanchard Vorrichtung zur Erzeugung von Schall- und Ultraschallschwingungen in Gasen und Fluessigkeiten
DE1209781B (de) * 1964-06-08 1966-01-27 Messerschmitt Ag Sirene zur Erzeugung von reinen Sinusschwingungen und frequenzmodulierten Sinusschwingungen von Schall
FR1451123A (fr) * 1965-10-26 1966-06-24 Procédé de signalisation et sirène hydraulique à signaux pulsés
DE1274937B (de) * 1967-04-07 1968-08-08 Entwicklungsring Sued G M B H Mit Druckmedium betriebener Ultraschall-Generator
DE2262948C3 (de) * 1972-12-22 1978-10-12 Karl 8000 Muenchen Kolar Preßluftsirene
ATE4662T1 (de) * 1978-07-03 1983-09-15 Mats Olsson Konsult Ab Niederfrequenz schallgeber.

Also Published As

Publication number Publication date
DK250482A (da) 1982-06-03
EP0069741A1 (en) 1983-01-19
DK152412C (da) 1988-07-25
FI823866L (fi) 1982-11-11
SE8007150L (sv) 1982-04-14
FI823866A0 (fi) 1982-11-11
SE425597B (sv) 1982-10-18
FI71622B (fi) 1986-10-10
NO152589B (no) 1985-07-15
NO821858L (no) 1982-06-04
WO1982001328A1 (en) 1982-04-29
NO152589C (no) 1985-10-23
FI71622C (fi) 1987-01-19
DK152412B (da) 1988-02-29

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