EP1542810A1 - Generateur de sons basse frequence a entrainement pneumatique et procede de regulation du piston d'un generateur de ce type - Google Patents

Generateur de sons basse frequence a entrainement pneumatique et procede de regulation du piston d'un generateur de ce type

Info

Publication number
EP1542810A1
EP1542810A1 EP03765419A EP03765419A EP1542810A1 EP 1542810 A1 EP1542810 A1 EP 1542810A1 EP 03765419 A EP03765419 A EP 03765419A EP 03765419 A EP03765419 A EP 03765419A EP 1542810 A1 EP1542810 A1 EP 1542810A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
pressure
sound generator
resonator
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.)
Granted
Application number
EP03765419A
Other languages
German (de)
English (en)
Other versions
EP1542810B1 (fr
Inventor
Mats Olsson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1542810A1 publication Critical patent/EP1542810A1/fr
Application granted granted Critical
Publication of EP1542810B1 publication Critical patent/EP1542810B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • 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
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses

Definitions

  • the invention relates to an air-driven low frequency sound generator, as is described in the preamble of patent claim 1.
  • the invention also relates to a method for regulating the stand-still position of a piston included in a low frequency sound generator, as described in the preamble of patent claim 6.
  • the present invention relates to a low frequency sound generator of the type described in WO-A1 -8807894, in which a feeder unit comprising a movable piston is used to generate a standing gas-borne sound wave in a resonator.
  • the piston performs a reciprocating movement inside a cylinder, which is surrounded by a surge tank connected to a pressure gas source.
  • the piston regulates a connection opening between the cylinder and the surge tank. Since this connection opening of the cylinder is located close to an open end of the cylinder, which is facing and in communication with an open end of the resonator tube, the resonator tube is also in communication with the interior of the surge tank.
  • the dimensions of the resonator are chosen in such a way that a standing sound wave may be generated in the resonator by the pressure gas supplied via the surge tank.
  • the resonator is a quarter wave resonator, in most cases a quarter wave resonator tube.
  • this standing sound wave has its maximum sound pressure amplitude where the feeder unit is situated.
  • This sound pressure works on the end surface of the piston, resulting in a reciprocating movement of the piston.
  • the other end of the piston is spring-loaded, and the piston can move in phase with the variations in sound pressure of the standing wave under the condition that the resonance frequency of the oscillating mechanical system is higher than the frequency of the standing sound wave in the resonator.
  • Sound generators of this type are, for example, used for cleaning big boilers, heat exchangers and other apparatus where it is difficult to get access to the surfaces that need to be cleaned.
  • these sound generators are used intermittently.
  • the piston In such a stand-still position, the piston will normally be located such that the connection opening between the surge tank and the inside of the cylinder is not completely blocked by the piston and thereby gas will be flowing back from the resonator tube into the cylinder and further into the surge tank.
  • This gas flow has the disadvantage that it may cause corrosion on the sliding surfaces for the piston inside the cylinder when the gas flows from the resonator tube via the cylinder and into the surge tank.
  • the object of the present invention is primarily to solve the problems discussed above. This is achieved, according to the present invention, by means of an air-driven low frequency sound generator provided with the new features as defined in the characterizing portion of patent claim 1 , and by a method as defined in the characterizing portion of claim 6.
  • Another important advantage that is achieved by the present invention is that a much speedier start-up of the movement of the piston is obtained.
  • an additional pressure is exerted on the spring- loaded end of the piston, which result in the connection opening between the surge tank and the cylinder being blocked completely, thereby shutting off the pressure gas supply to the feeder unit.
  • said additional pressure is made to cease, said connection opening is instantly opened completely, a power- ful gas pulse rushes into the resonator and the generator will start immediately. Tests have shown that the operating sound pressure amplitude can be reached in as short a time as within 1/10 of a second.
  • the present invention will result in a stand-still position where the second lower end of the piston will be located in the vicinity of the open end of the cylinder, next to the resonator.
  • low frequency sound is intended sound of a frequency below approximately 38 Hz.
  • a suitable operating sound frequency would be between approximately 15-35 Hz.
  • Fig. 1 is a schematic illustration of a sound generator according to the present invention, during operation, with the piston located at its upper dead centre,
  • Fig. 2 is a schematic illustration of a sound generator, according to the present invention, during operation, with the piston located at its lower dead centre, and
  • Fig. 3 is a schematic illustration of a sound generator, according to the present invention, when it is at an intermittent stand-still.
  • the illustrated sound generator comprises a feeder unit 1 mounted on a resonator, which in the illustrated case is a quarter wave resonance tube 2.
  • the feeder unit includes a piston 4 that is arranged to perform a reciprocating movement inside a cylinder 5, between an upper dead centre 3, shown in Fig. 1 , and a lower dead centre 8, shown in Fig. 2.
  • the piston is spring-loaded by means of a spring 6, which is attached to the closed end of the cylinder.
  • the cylinder and the piston are mounted in a surge tank or casing 7.
  • a first pressure gas source 9 providing a constant gas pressure
  • P d preferably by compressed air
  • the cylinder has an open end 11 facing the resonance tube and communicating therewith.
  • the cylinder is also provided with one or several connection openings or ports 0 in the cylinder wall by means of which the pressure gas supplied to the surge tank can also enter into the cylinder and continue down into the resonance tube.
  • connection opening 18 used for pressure equalisation and it provides a communication either to atmospheric pressure or to a space at the open end of the resonator tube.
  • the piston When the differential pressure has its minimum value (- ⁇ o), the piston is suctioned to its lower dead centre, as illustrated in Fig. 2, and the ports are closed.
  • a second pressure gas source 14 At the opposite end of the cylinder, i.e. that end which is not facing the resonance tube and at which end the spring of the piston is fitted, there is a second pressure gas source 14 connected to the cylinder.
  • This second pressure source 14 supplies a constant gas pressure, p c2 , preferably compressed air, which is regulated by a regulating valve 15.
  • This com- pressed air pressure, p c2 is much higher than the gas pressure p g .
  • the regulating valve 15 is at the position shown in Figs. 1 and 2, i.e. the supply from the pressure gas source 14 is shut off, the piston will move between the upper and lower dead centres with the frequency f of the standing wave in the resonance tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
EP03765419A 2002-07-22 2003-07-21 Generateur de sons basse frequence a entrainement pneumatique et procede de regulation du piston d'un generateur de ce type Expired - Lifetime EP1542810B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0202291 2002-07-22
SE0202291A SE524605C2 (sv) 2002-07-22 2002-07-22 Luftdriven lågfrekvensljudgenerator samt metod för att reglera viloläget hos en kolv ingående i en dylik
PCT/SE2003/001234 WO2004009255A1 (fr) 2002-07-22 2003-07-21 Generateur de sons basse frequence a entrainement pneumatique et procede de regulation du piston d'un generateur de ce type

Publications (2)

Publication Number Publication Date
EP1542810A1 true EP1542810A1 (fr) 2005-06-22
EP1542810B1 EP1542810B1 (fr) 2006-02-15

Family

ID=20288610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03765419A Expired - Lifetime EP1542810B1 (fr) 2002-07-22 2003-07-21 Generateur de sons basse frequence a entrainement pneumatique et procede de regulation du piston d'un generateur de ce type

Country Status (8)

Country Link
EP (1) EP1542810B1 (fr)
AT (1) ATE317731T1 (fr)
AU (1) AU2003247312A1 (fr)
DE (1) DE60303608T2 (fr)
DK (1) DK1542810T3 (fr)
ES (1) ES2257695T3 (fr)
SE (1) SE524605C2 (fr)
WO (1) WO2004009255A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3538288A4 (fr) * 2016-10-31 2020-09-30 Mats Olsson Générateur d'infrasons pour améliorer la combustion de combustibles solides
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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341477A1 (de) * 2003-09-05 2005-03-31 Riehle, Rainer, Dipl.-Ing. Schallgenerator zur Erzeugung in Rohrleitungen eines Wasser- oder Gasversorgungssystems ausbreitungsfähiger Schallimpulse
EP2981368A4 (fr) * 2013-04-04 2016-09-21 Infrafone Ab Amortisseur de vibrations destiné à la réduction de vibrations d'un générateur acoustique basse fréquence
US20160033215A1 (en) * 2013-04-04 2016-02-04 Infrafone Ab A purge air cyclone for use in a low frequency sound generator
US10619037B2 (en) 2017-11-21 2020-04-14 Johns Manville Roofing compositions comprising linear low density polyethylene

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2351163A (en) * 1943-01-21 1944-06-13 Diamond Power Speciality Boiler cleaner
ATE4662T1 (de) * 1978-07-03 1983-09-15 Mats Olsson Konsult Ab Niederfrequenz schallgeber.
SE457240B (sv) * 1987-04-08 1988-12-12 Infrasonik Ab Luftdriven positivt aaterkopplad laagfrekvensljudgenerator
GB8717312D0 (en) * 1987-07-22 1987-08-26 Jerlin R R Sound generating system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004009255A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3538288A4 (fr) * 2016-10-31 2020-09-30 Mats Olsson Générateur d'infrasons pour améliorer la combustion de combustibles solides
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
WO2022167425A1 (fr) * 2021-02-02 2022-08-11 Mats Olsson Vanne tournante pour alimenter en impulsions d'air un tube de résonance pour produire un son basse fréquence et procédé d'alimentation de ces impulsions de manière optimale

Also Published As

Publication number Publication date
ES2257695T3 (es) 2006-08-01
DK1542810T3 (da) 2006-05-15
EP1542810B1 (fr) 2006-02-15
DE60303608D1 (de) 2006-04-20
DE60303608T2 (de) 2006-12-07
ATE317731T1 (de) 2006-03-15
SE524605C2 (sv) 2004-08-31
SE0202291D0 (sv) 2002-07-22
SE0202291L (sv) 2004-01-23
AU2003247312A1 (en) 2004-02-09
WO2004009255A1 (fr) 2004-01-29

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