WO1998053926A1 - Method and apparatus for acoustic cleaning - Google Patents

Method and apparatus for acoustic cleaning Download PDF

Info

Publication number
WO1998053926A1
WO1998053926A1 PCT/FI1998/000423 FI9800423W WO9853926A1 WO 1998053926 A1 WO1998053926 A1 WO 1998053926A1 FI 9800423 W FI9800423 W FI 9800423W WO 9853926 A1 WO9853926 A1 WO 9853926A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound wave
wave burst
burst
preselected
cleaning
Prior art date
Application number
PCT/FI1998/000423
Other languages
French (fr)
Inventor
Ulf Krogars
Martti Kinnunen
Original Assignee
Ulf Krogars
Martti Kinnunen
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 Ulf Krogars, Martti Kinnunen filed Critical Ulf Krogars
Priority to AU75310/98A priority Critical patent/AU7531098A/en
Publication of WO1998053926A1 publication Critical patent/WO1998053926A1/en

Links

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
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/04—Sound-producing devices
    • G10K15/043—Sound-producing devices producing shock waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • 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
    • B08B7/026—Using sound waves

Definitions

  • the invention relates to a method for cleaning objects to be cleaned by means of sound wave vibrations.
  • the invention also relates to an apparatus for cleaning objects to be cleaned by means of sound wave vibration.
  • An advantage of the acoustic cleaning method over different mechanical cleaning methods is the possibility of using it without interrupting the process.
  • the method is also capable of cleaning shadow areas and other areas difficult to reach. The method does not wear the objects to be cleaned, is easy to use, and its maintenance costs are low.
  • the basic frequency of the cleaning means is generally close to the resonant frequency of the vibration of the valve, whereby the horn may be caused to blare most easily.
  • the basic frequency can be regulated by changing the dimensions of the sonic horn and the vibration frequency of the valve.
  • the most suitable operation frequency depends on the object to be cleaned and on the quality of particles.
  • the apparatus in accordance with the invention is characterized in that the apparatus comprises means for producing a sound wave burst of a preselected frequency, and means for providing preselected duration for the sound wave burst and for repeating the sound wave burst after a preselected time interval.
  • the principle of the method in accordance with the invention is that the operation of the cleaning apparatus is changed such that the duration of a pulse is shortened to about 10 % of the previous one, and these short pulses are repeated at predetermined time intervals.
  • the noise load of the thus created cleaning cycle remains clearly lower than that of the conventional sonic cleaning methods.
  • the wear of the apparatus becomes slower.
  • the procedure in the most general embodiment of the method in accordance with the invention is as follows. First, a sound wave burst of a preselected frequency is produced. Second, a sound wave burst of preselected duration is directed to an object that is being cleaned, in which connection, during said duration, the sound wave burst has reached the maximum loudness of the sound wave burst and is reduced from said maximum loudness to a preselected lower loudness. Finally, said sound wave burst is repeated after a second predetermined time interval.
  • Figure 2 is a partial sectional view of a sonic horn part of the acoustic cleaning apparatus in accordance with the invention seen from the side.
  • Figure 3 shows the sonic horn part of Figure 2 viewed from behind.
  • Figure 5A shows a sound cycle of a cleaning apparatus known from the state of the art
  • Figure 5B shows a sound cycle in accordance with the invention.
  • Figure 6 shows a disc by which a solenoid valve can be controlled very quickly, as a view seen from the top.
  • Figures 7A and 7B show two advantageous modes of producing a sound wave burst by means of rapid gas expansion.
  • the block diagram of Fig. 1 shows the operation principle and basic components of the apparatus.
  • the device comprises a feed system 11 for compressed gas, a spherical valve 12, a filter 13, a pressure controller 14, a solenoid valve 15, and a horn part 16.
  • Compressed gas is fed into the system through the spherical valve 12, the filter 13 and the pressure controller 14.
  • Figs. 2 and 3 show the horn part 16 in more detail.
  • the horn part 16 comprises four basic components, a horn 17, a frame 18, a cover 19, and a diaphragm 20.
  • the cover 19 is provided with holes 22 for fastening members 21.
  • the cover 19 is fastened to the frame 18 by means of the fastening members 21.
  • the diaphragm 20 of the valve When compressed gas is applied to the solenoid valve 15, the diaphragm 20 of the valve opens and the gas can enter the sonic horn 17. A subsequent decrease in pressure causes the diaphragm 20 to close and the sound wave to be interrupted. A rise in pressure after that opens the diaphragm 20 again after a few milliseconds, and the thus produced vibration generates a sound wave burst needed in cleaning.
  • Fig. 4 shows a measuring curve of the development of the sound pressure as a function of time during about 32 ms.
  • the device is switched on at the point of time 0 s and the sound pressure curve starts to grow at the point of time about 7 ms.
  • the sound pressure curve is interrupted, for example, after the duration of 15 ms.
  • Fig. 5 A illustrates the present state of sonic cleaning technology.
  • the apparatus applies long sound wave bursts in order to achieve a cleaning result.
  • the operation time, i.e. the working time, of the apparatus is denoted with t j and the time between the cleaning pulses, i.e. the pause time, is denoted with 13.
  • Fig. 5B shows a disc 23 used for control of the sonic cleaning apparatus, said disc having holes 24, preferably round holes, situated in the periphery of the circle.
  • the sound excitation is produced by means of explosion-like combustion.
  • the burning substance is an inflammable gas, which is passed from a feed line 28 so as to be mixed with the compressed air passed along a feed line 27. Ignition takes place in an ignition chamber 26 at a precisely predetermined instant, for example, by means of an electric spark.
  • the sound excitation is produced in a vibration chamber 25.
  • the operating substance is an explosive, for example, gunpowder or another substance that behaves in a similar way, in which case ignition is carried out by means of a firing mechanism 29. In both embodiments, sound making and the pause times are determined precisely in advance.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Cleaning In General (AREA)

Abstract

The invention relates to a method and an apparatus for cleaning objects to be cleaned by means of sound wave vibrations. In the method, a sound wave burst of a preselected frequency and of preselected duration (t1) is produced. The sound wave burst is directed to an object that is cleaned, in which connection, during said duration (t1), the sound wave burst reaches the maximum loudness and is reduced to a preselected lower loudness. This sound wave burst can be repeated after a predetermined time interval (t2). The sound wave burst is produced by an apparatus which comprises a feed system for compressed gas and a vibration part. The vibration part comprises a valve and a sonic horn. Sonic cleaning devices are commonly used in the process industry, where powdery particles are processed. The object of cleaning is to break the deposits formed by powders and to remove them from the processes.

Description

Method and apparatus for acoustic cleaning
The invention relates to a method for cleaning objects to be cleaned by means of sound wave vibrations. The invention also relates to an apparatus for cleaning objects to be cleaned by means of sound wave vibration.
Acoustic cleaning, which is also called sound sweeping, is a method which is used for cleaning of e.g. boilers, silos, cyclones, blowers, filter devices and the like. The acoustic cleaning method is fit for use in objects in which, for example, powdery materials are treated or in which, for example, soot or dust is produced as harmful by-products. Such particles readily form deposits which impede the flow of the process and weaken its performance.
An advantage of the acoustic cleaning method over different mechanical cleaning methods is the possibility of using it without interrupting the process. As a second significant advantage it may mentioned that the method is also capable of cleaning shadow areas and other areas difficult to reach. The method does not wear the objects to be cleaned, is easy to use, and its maintenance costs are low.
In the acoustic cleaning method, a sound wave is directed to the object to be cleaned, said sound wave transmitting a pressure shock to the particles to be loosened. In order to achieve a cleaning result, the force transmitted by a sound wave burst to each particle must be higher than the force which holds a particle attached to a base or particles attached to one another.
The sound wave burst needed for cleaning is provided by means of a diaphragm valve controlled by compressed gas and of a sonic horn, which form a vibration system. Connecting the compressed gas opens the diaphragm and a gas flow can enter the horn. After that, the pressure decreases while the gas discharges, causing the diaphragm to close. The basic excitation of a sound wave burst arises from interrupting of the flow of the compressed gas. The thus produced frequency distribution includes a basic frequency and its harmonic multiple frequencies.
The basic frequency of the cleaning means is generally close to the resonant frequency of the vibration of the valve, whereby the horn may be caused to blare most easily. The basic frequency can be regulated by changing the dimensions of the sonic horn and the vibration frequency of the valve. The most suitable operation frequency depends on the object to be cleaned and on the quality of particles.
The most significant problem associated with the present-day acoustic cleaning methods which are in use is the considerable noise load caused by the apparatus. A typical noise level is 150 dB when the apparatus is in operation. In plants situated in densely populated areas, in particular, this restricts the use of the cleaning means to taking place only in the daytime. Similarly, a high noise level is harmful to the employees working in plants.
The object of the invention is to provide an improvement over the currently known method for acoustic cleaning and over the associated apparatus arrangements.
The objective of the invention is achieved by a method which is characterized in that, in the method, a sound wave burst of a preselected frequency is produced, a sound wave burst of preselected duration is directed to an object that is cleaned, in which connection, during said duration, the sound wave burst reaches the maximum loudness of the sound wave burst and is reduced from said maximum loudness to a preselected lower loudness, and said sound wave burst is repeated after a second predetermined time interval.
The apparatus in accordance with the invention is characterized in that the apparatus comprises means for producing a sound wave burst of a preselected frequency, and means for providing preselected duration for the sound wave burst and for repeating the sound wave burst after a preselected time interval. When examining the operation of acoustic cleaning apparatus, it has been observed that the actual cleaning work takes place immediately after starting of the apparatus. In other words, applying long cleaning pulses is of no significant further benefit, but the same cleaning efficiency can be achieved with an operating time that is consider- ably shorter than that of present-day practice.
The principle of the method in accordance with the invention is that the operation of the cleaning apparatus is changed such that the duration of a pulse is shortened to about 10 % of the previous one, and these short pulses are repeated at predetermined time intervals. The noise load of the thus created cleaning cycle remains clearly lower than that of the conventional sonic cleaning methods. At the same time, the wear of the apparatus becomes slower.
The procedure in the most general embodiment of the method in accordance with the invention is as follows. First, a sound wave burst of a preselected frequency is produced. Second, a sound wave burst of preselected duration is directed to an object that is being cleaned, in which connection, during said duration, the sound wave burst has reached the maximum loudness of the sound wave burst and is reduced from said maximum loudness to a preselected lower loudness. Finally, said sound wave burst is repeated after a second predetermined time interval.
The duration of the sound wave burst is preferably chosen to be 5 — 15 ms. The sound wave burst is repeated, for example, at intervals of 1 — 10 s, preferably at intervals of 1 — 2 s. A suitable pause time depends on the application and is usually of the order of 1 — 60 min. The frequency of the sound wave burst is chosen as desired, preferably in the range of from 80 Hz to 500 Hz by changing the horn part of the apparatus.
The method and the apparatus in accordance with the invention provide a number of significant advantages. Instead of applying long sound pulses, the noise load of the environment can be considerably relieved by a shorter operating time. In addition, cleaning efficiency is considerably improved. At the same time, the wear of the apparatus becomes slower since unnecessary operating time is eliminated.
The invention will be described in detail with reference to some preferred embodi- ments shown in the figures of the accompanying drawings, to which embodiments the invention is, however, not intended to be exclusively confined.
Figure 1 shows a sonic cleaning apparatus in accordance with the invention as a block diagram.
Figure 2 is a partial sectional view of a sonic horn part of the acoustic cleaning apparatus in accordance with the invention seen from the side.
Figure 3 shows the sonic horn part of Figure 2 viewed from behind.
Figure 4 shows graphically the development of sound pressure as a function of time.
Figure 5A shows a sound cycle of a cleaning apparatus known from the state of the art, and Figure 5B shows a sound cycle in accordance with the invention.
Figure 6 shows a disc by which a solenoid valve can be controlled very quickly, as a view seen from the top.
Figures 7A and 7B show two advantageous modes of producing a sound wave burst by means of rapid gas expansion.
The block diagram of Fig. 1 shows the operation principle and basic components of the apparatus. The device comprises a feed system 11 for compressed gas, a spherical valve 12, a filter 13, a pressure controller 14, a solenoid valve 15, and a horn part 16. Compressed gas is fed into the system through the spherical valve 12, the filter 13 and the pressure controller 14. Figs. 2 and 3 show the horn part 16 in more detail. The horn part 16 comprises four basic components, a horn 17, a frame 18, a cover 19, and a diaphragm 20. The cover 19 is provided with holes 22 for fastening members 21. The cover 19 is fastened to the frame 18 by means of the fastening members 21.
When compressed gas is applied to the solenoid valve 15, the diaphragm 20 of the valve opens and the gas can enter the sonic horn 17. A subsequent decrease in pressure causes the diaphragm 20 to close and the sound wave to be interrupted. A rise in pressure after that opens the diaphragm 20 again after a few milliseconds, and the thus produced vibration generates a sound wave burst needed in cleaning.
Fig. 4 shows a measuring curve of the development of the sound pressure as a function of time during about 32 ms. In the situation of the figure, the device is switched on at the point of time 0 s and the sound pressure curve starts to grow at the point of time about 7 ms. In the embodiment in accordance with the invention, the sound pressure curve is interrupted, for example, after the duration of 15 ms.
Fig. 5 A illustrates the present state of sonic cleaning technology. According to the present state of the art, the apparatus applies long sound wave bursts in order to achieve a cleaning result. In Fig. 5A, the operation time, i.e. the working time, of the apparatus is denoted with tj and the time between the cleaning pulses, i.e. the pause time, is denoted with 13.
By means of the method in accordance with the invention, as shown in Fig. 5B, the duration of the sound wave burst, i.e. the working time tj, is shortened to a considerable extent. A number of these short pulses are applied at time intervals of t2- After applying a pulse sequence, there is a pause for the duration of the pause time .3. Repeating of a number of short cleaning pulses instead of one long pulse provides significantly better cleaning efficiency as compared with the present-day technique. Fig. 6 shows a disc 23 used for control of the sonic cleaning apparatus, said disc having holes 24, preferably round holes, situated in the periphery of the circle. By using discs 23 rotating in opposite directions, the solenoid valve 15 can be controlled much more quickly than by the present-day technique.
In the embodiments shown in Figs. 7 A and 7 A, the sound excitation is produced by means of explosion-like combustion. In the embodiment shown in Fig. 7 A, the burning substance is an inflammable gas, which is passed from a feed line 28 so as to be mixed with the compressed air passed along a feed line 27. Ignition takes place in an ignition chamber 26 at a precisely predetermined instant, for example, by means of an electric spark. The sound excitation is produced in a vibration chamber 25. In the case of Fig. 7B, the operating substance is an explosive, for example, gunpowder or another substance that behaves in a similar way, in which case ignition is carried out by means of a firing mechanism 29. In both embodiments, sound making and the pause times are determined precisely in advance.
Only some advantageous embodiments of the invention have been described above, and it is obvious to a person skilled in the art that numerous modifications may be made to them within the inventive idea set forth in the accompanying claims.

Claims

Claims
1. A method for cleamng objects to be cleaned by means of sound wave vibrations, characterized in that, in the method,
(a) a sound wave burst of a preselected frequency is produced,
(b) a sound wave burst of preselected duration (tj) is directed to an object that is cleaned, in which connection, during said duration (tj), the sound wave burst has reached the maximum loudness of the sound wave burst and is reduced from said maximum loudness to a preselected lower loudness, and
(c) said sound wave burst is repeated after a second predetermined time interval
2. A method as claimed in claim 1, characterized in that as the duration (tj) of the sound wave burst is chosen 5ΓÇö15 ms.
3. A method as claimed in claim 1 or 2, characterized in that said sound wave burst is repeated at intervals of 1ΓÇö10 s, preferably at intervals of 1ΓÇö2 s.
4. A method as claimed in any one of claims 1 to 3, characterized in that, in the method, the use of the sound wave burst is interrupted for a period of 1ΓÇö60 minutes.
5. A method as claimed in any one of claims 1 to 4, characterized in that, in the method, the frequency of the sound wave burst is chosen from the range of 80 Hz - 500 Hz.
6. A method as claimed in any one of claims 1 to 5, characterized in that the sound wave burst is produced by means of compressed gas.
7. A method as claimed in any one of claims 1 to 5, characterized in that the sound wave burst is produced by means of an inflammable gas mixture.
8. A method as claimed in any one of claims 1 to 5, characterized in that the sound wave burst is produced by means of an explosive, preferably gunpowder.
9. An apparatus for cleaning objects to be cleaned by means of sound wave vibration, characterized in that the apparatus comprises means (11-16) for producing a sound wave burst of a preselected frequency, and means (15, 23) for providing preselected duration for the sound wave burst and for repeating the sound wave burst after a preselected time interval.
10. An apparatus as claimed in claim 9, characterized in that the apparatus comprises a chamber (26) and gas feed lines (27,28) for providing an inflammable gas mixture into the chamber (26).
11. An apparatus as claimed in claim 9, characterized in that the apparatus comprises a chamber (26) and a firing mechanism (29) which is arranged to fire an explosive, preferably gunpowder, placed in the chamber (26).
12. An apparatus as claimed in any one of claims 9 to 11, characterized in that a valve (15) is controlled by means of discs (23) rotating in opposite directions, in the periphery of which discs there are holes (24), and the speed of rotation of which discs can be regulated.
13. An apparatus as claimed in claim 12, characterized in that the holes (24) are round.
PCT/FI1998/000423 1997-05-28 1998-05-19 Method and apparatus for acoustic cleaning WO1998053926A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU75310/98A AU7531098A (en) 1997-05-28 1998-05-19 Method and apparatus for acoustic cleaning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI972252 1997-05-28
FI972252A FI972252A (en) 1997-05-28 1997-05-28 Procedure and facility for acoustic cleaning

Publications (1)

Publication Number Publication Date
WO1998053926A1 true WO1998053926A1 (en) 1998-12-03

Family

ID=8548921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1998/000423 WO1998053926A1 (en) 1997-05-28 1998-05-19 Method and apparatus for acoustic cleaning

Country Status (3)

Country Link
AU (1) AU7531098A (en)
FI (1) FI972252A (en)
WO (1) WO1998053926A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078912A1 (en) * 2000-04-14 2001-10-25 Nirania Ky Apparatus and method for acoustic cleaning
GB2399871A (en) * 2003-03-28 2004-09-29 Boc Group Plc Device using sound waves to inhibit deposition of particulates on, or remove them from, surfaces
WO2005095008A1 (en) * 2004-04-02 2005-10-13 Nirafon Oy Method and apparatus for generating gas pulses
EP1463573B1 (en) * 2002-01-09 2006-08-23 Borealis Technology Oy A crystallization apparatus and method for the formation of crystals in a such apparatus
DE102005055813A1 (en) * 2005-11-21 2007-05-24 Fritz Egger Gmbh & Co. Device for producing wood materials such as wood chips and/or fibers comprises an acoustic irradiation device which produces sound with a prescribed frequency, pressure level and duration for feeding through the device to clean a part
CN102758691A (en) * 2011-04-20 2012-10-31 通用电气公司 Acoustic cleaning assembly for use in power generation systems and method of assembling same
CN103433248A (en) * 2013-08-28 2013-12-11 江苏惠能声波技术有限公司 Acoustic wave dust removal device
WO2017151041A1 (en) * 2016-02-29 2017-09-08 Av Sootblower Ab Acoustic cleaner
CN112317461A (en) * 2019-08-05 2021-02-05 康宁股份有限公司 Sonic cleaning of fiber draw furnace
WO2022105752A1 (en) * 2020-11-17 2022-05-27 北京滤分环保技术有限责任公司 Method and device for removing impurities from granular material

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233694A (en) * 1962-08-10 1966-02-08 Shell Oil Co High energy acoustic impulse source
US3457893A (en) * 1966-12-29 1969-07-29 Hart Carter Co Interruptible-jet control means for producing short blasts of high pressure fluid
EP0045292A2 (en) * 1980-07-25 1982-02-03 Kockumation Ab Fluid operated pressure oscillation generator
WO1982001328A1 (en) * 1980-10-13 1982-04-29 Fransman Per B Positively controlled sound generator
WO1982003803A1 (en) * 1981-04-30 1982-11-11 Olsson Mats Anders An arrangement in an infrasound generator
US4359962A (en) * 1978-07-03 1982-11-23 Mats Olsson Konsult Ab Low-frequency sound generator
GB2125314A (en) * 1982-07-19 1984-03-07 Babcock & Wilcox Co Method of and apparatus for cleaning fabrics
DE3821351A1 (en) * 1988-06-24 1989-12-28 Latoschinski Heinz Juergen Valve
US4923374A (en) * 1986-11-28 1990-05-08 Svenska Rotor Maskiner Ab Method for producing pressure pulses in a mass of gas and a device for performing the method
US5353721A (en) * 1991-07-15 1994-10-11 Manufacturing And Technology Conversion International Pulse combusted acoustic agglomeration apparatus and process
DE4341996A1 (en) * 1993-12-09 1995-06-14 Abb Management Ag Method of preventing formation of deposits on interior of gas turbine

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233694A (en) * 1962-08-10 1966-02-08 Shell Oil Co High energy acoustic impulse source
US3457893A (en) * 1966-12-29 1969-07-29 Hart Carter Co Interruptible-jet control means for producing short blasts of high pressure fluid
US4359962A (en) * 1978-07-03 1982-11-23 Mats Olsson Konsult Ab Low-frequency sound generator
EP0045292A2 (en) * 1980-07-25 1982-02-03 Kockumation Ab Fluid operated pressure oscillation generator
WO1982001328A1 (en) * 1980-10-13 1982-04-29 Fransman Per B Positively controlled sound generator
WO1982003803A1 (en) * 1981-04-30 1982-11-11 Olsson Mats Anders An arrangement in an infrasound generator
GB2125314A (en) * 1982-07-19 1984-03-07 Babcock & Wilcox Co Method of and apparatus for cleaning fabrics
US4923374A (en) * 1986-11-28 1990-05-08 Svenska Rotor Maskiner Ab Method for producing pressure pulses in a mass of gas and a device for performing the method
DE3821351A1 (en) * 1988-06-24 1989-12-28 Latoschinski Heinz Juergen Valve
US5353721A (en) * 1991-07-15 1994-10-11 Manufacturing And Technology Conversion International Pulse combusted acoustic agglomeration apparatus and process
DE4341996A1 (en) * 1993-12-09 1995-06-14 Abb Management Ag Method of preventing formation of deposits on interior of gas turbine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. K4074/E31, Week 8231; & SU,A,871 186 (KONDRATEV VI) 9 October 1981. *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078912A1 (en) * 2000-04-14 2001-10-25 Nirania Ky Apparatus and method for acoustic cleaning
US7354559B2 (en) 2002-01-09 2008-04-08 Borealis Technology Oy Crystallization apparatus and method for the formation of crystals in a such apparatus
EP1463573B1 (en) * 2002-01-09 2006-08-23 Borealis Technology Oy A crystallization apparatus and method for the formation of crystals in a such apparatus
CN1292820C (en) * 2002-01-09 2007-01-03 博里利斯技术有限公司 A crystallization apparatus and method for the formation of crystals in a such apparatus
GB2399871A (en) * 2003-03-28 2004-09-29 Boc Group Plc Device using sound waves to inhibit deposition of particulates on, or remove them from, surfaces
GB2399871B (en) * 2003-03-28 2005-05-11 Boc Group Plc Inhibiting or removing deposition of particulates
WO2005095008A1 (en) * 2004-04-02 2005-10-13 Nirafon Oy Method and apparatus for generating gas pulses
US7585372B2 (en) 2004-04-02 2009-09-08 Nirafon Oy Method and apparatus for generating gas pulses
KR100779778B1 (en) * 2004-04-02 2007-11-27 니라폰 오와이 Method and apparatus for generating gas pulses
DE102005055813A1 (en) * 2005-11-21 2007-05-24 Fritz Egger Gmbh & Co. Device for producing wood materials such as wood chips and/or fibers comprises an acoustic irradiation device which produces sound with a prescribed frequency, pressure level and duration for feeding through the device to clean a part
DE102005055813B4 (en) * 2005-11-21 2013-03-21 Fritz Egger Gmbh & Co. Apparatus and process for the production of wood-based materials and methods for cleaning
CN102758691A (en) * 2011-04-20 2012-10-31 通用电气公司 Acoustic cleaning assembly for use in power generation systems and method of assembling same
CN103433248A (en) * 2013-08-28 2013-12-11 江苏惠能声波技术有限公司 Acoustic wave dust removal device
WO2017151041A1 (en) * 2016-02-29 2017-09-08 Av Sootblower Ab Acoustic cleaner
CN112317461A (en) * 2019-08-05 2021-02-05 康宁股份有限公司 Sonic cleaning of fiber draw furnace
WO2021022914A1 (en) * 2019-08-05 2021-02-11 康宁股份有限公司 Acoustic wave cleaning of optical fiber drawing furnace
US11407012B2 (en) 2019-08-05 2022-08-09 Corning Incorporated Sonic cleaning of optical fiber draw furnace
WO2022105752A1 (en) * 2020-11-17 2022-05-27 北京滤分环保技术有限责任公司 Method and device for removing impurities from granular material

Also Published As

Publication number Publication date
FI972252A0 (en) 1997-05-28
AU7531098A (en) 1998-12-30
FI972252A (en) 1998-11-29

Similar Documents

Publication Publication Date Title
US5430691A (en) Shock wave generator
AU621920B2 (en) Cleaning apparatus and process
WO1998053926A1 (en) Method and apparatus for acoustic cleaning
US6845868B1 (en) Multifrequency vibratory separator system, a vibratory separator including same, and a method of vibratory separation of solids
US20070137150A1 (en) System and method for cleaning a filter
GB2081687A (en) Storage Bin Activator Device and Method of Restoring Bulk Material Free Flow
PL314236A1 (en) Apparatus for and method of acoustically causing agglomeration of solid particles in a pulsatory combustion chamber
CA2252384A1 (en) Control systems for operating gas cleaning devices
US5579845A (en) Method for improved water well production
US3867291A (en) Apparatus for cleaning filters
CA2086951A1 (en) Ultrasonic wave generator and floating or suspended particle collecting apparatus using the same
JPS63501934A (en) explosive coating device
JPH08177462A (en) Dust collector
WO2001081017A8 (en) System and method for cleaning a screen
AU646625B1 (en) Acoustic transducers
RU2256515C2 (en) Multifrequency vibration separation system, vibration separator on the base of the system and method of vibration separation of solid particles
GB2125314A (en) Method of and apparatus for cleaning fabrics
SU1242245A1 (en) Cyclone
RU2116193C1 (en) Apparatus for deep vibrational working of materials
SU940244A1 (en) Device for exciting acoustic oscillations
CN1223597A (en) Control systems for operating gas cleaning devices
SU731000A1 (en) Noise-absorbing coating for interior cavities of pheumatic machines
SU1119729A1 (en) Method of dispersion of clay materials
SU1393457A1 (en) Method of acoustic coagulation of aerosols
WO1996036418A1 (en) A filter bag and production of such a filter bag

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH GM GW HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 1999500285

Format of ref document f/p: F

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA