EP0300696A2 - Schallerzeugungsanordnung - Google Patents

Schallerzeugungsanordnung Download PDF

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Publication number
EP0300696A2
EP0300696A2 EP88306493A EP88306493A EP0300696A2 EP 0300696 A2 EP0300696 A2 EP 0300696A2 EP 88306493 A EP88306493 A EP 88306493A EP 88306493 A EP88306493 A EP 88306493A EP 0300696 A2 EP0300696 A2 EP 0300696A2
Authority
EP
European Patent Office
Prior art keywords
sound
sound generator
generating system
valve
generator
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.)
Withdrawn
Application number
EP88306493A
Other languages
English (en)
French (fr)
Other versions
EP0300696A3 (de
Inventor
Rolf Robert Jerlin
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 EP0300696A2 publication Critical patent/EP0300696A2/de
Publication of EP0300696A3 publication Critical patent/EP0300696A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G7/00—Cleaning by vibration or pressure waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00—Methods preventing fouling
    • B08B17/02—Preventing deposition of fouling or of dust
    • 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
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • 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
    • G10K7/06—Sirens in which the sound-producing member is driven by a fluid, e.g. by a compressed gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2209/00—Details of machines or methods for cleaning hollow articles
    • B08B2209/005—Use of ultrasonics or cavitation, e.g. as primary or secondary action

Definitions

  • the present invention is concerned with the generating of sound, especially of low-frequency sound, and the use of that sound in a resonator for, among other possible purposes, keeping clean boilers, economisers and other units in which dust and/or soot may otherwise be deposited.
  • Sound at relatively low frequencies for example of the order of 20 Hz or much lower, has proved to be very successful in preventing or discouraging the build-up of deposits of dust and/or soot in, for example, the boilers of ships.
  • a rotating member located in a line conveying air (or gas) under pressure interrupts the air flow at regular intervals and thereby generates impulses of low-frequency sound, which are passed to a resonator which is in communication with the boiler or the like to be kept clean.
  • the resonator is typically a tube of which the length is of the order of one quarter of the wavelength of the sound it receives from the sound generator.
  • a cleaning system of the foregoing type is operated at frequent intervals, say every ten or twenty minutes or so, and it is therefore usual to keep the sound generator and the resonator, and therefore the boiler itself, in permanent communication, both while sound is being generated and throughout the time in between cleaning operations. While the sound generator is operating there is a positive flow of air through the system but in the intervening intervals hot air and also dust may pass back from the boiler to the sound generator, with the risk of damaging or blocking the latter. To counteract this effect, it has been proposed to keep the sound generator operating continuously at a reduced air flow rate. However it is then necessary to keep the bearings of the rotary member cool by, for example, diverting a part of the reduced air flow towards the bearings. This approach to the problem may necessitate designing rotary sound generators which are unduly expensive and of course there is the further disadvantage that running the sound generator continuously gives rise to continuous wear of the moving parts.
  • the sound generating system comprises a sound generator, preferably a rotary generator of sound, which functions by interrupting at predetermined frequent intervals a supply of air or gas under pressure, at least on resonance tube connected to receive sound pulses produced by said sound generator, and, disposed in the connecting line between the sound generator and the or each resonance tube, a valve having a straight-through flow passage therein which can be closed by rotation of a rotary valve member.
  • a sound generator preferably a rotary generator of sound, which functions by interrupting at predetermined frequent intervals a supply of air or gas under pressure, at least on resonance tube connected to receive sound pulses produced by said sound generator, and, disposed in the connecting line between the sound generator and the or each resonance tube, a valve having a straight-through flow passage therein which can be closed by rotation of a rotary valve member.
  • the sound generator may be any such generator, preferably a rotary generator, which functions by interrupting the air flow therethrough.
  • a rotary generator In such rotary generators one or more apertures in a fixed member may be designed to move into and out of register with one or more apertures in the rotary member as the latter member rotates.
  • the frequency of the sound generated is a function of the relative numbers of fixed and rotary apertures and of the frequency of rotation of the rotary member.
  • the positions of the apertures in the relatively movable members may be such that the air flow is interrupted by a rotating disc as it flows axially through the device or by a rotating cylindrical member as the air flows radially through the latter.
  • a less preferred sound generator is one in which a radial air flow is interrupted by relative axial movement of fixed and movable coaxial cylindrical members.
  • the resonance tube is a tube suspended so as to be able to vibrate with a minimum of restriction.
  • To a first, closed end of the tube the relatively low-intensity sound pulses from the sound generator are supplied and the other end of the tube is open and is located within, or in direct communication with, the space in which deposition is to be discouraged.
  • the tube may hang free within a boiler or may be linked with an economiser via a bellows.
  • the valve is disposed between the sound generator and the resonance tube and, when closed, completely cuts off any flow of air or gas from the sound generator and also prevents any backflow of exhaust or other hot gases from the boiler or the like to the sound generator. It is a feature of the invention that the valve should be of the type wherein the flow through the valve is via a straight-through flow passage therein and that the passage should be closable by rotation of a rotary valve member. Suitable valves meeting these criteria are butterfly valves and ball valves, of which the former are particularly preferred.
  • the rotary valve very effectively prevents hot gases penetrating back to the sound generator, it is not necessary to keep the latter operating continuously nor to provide it with a continuous air flow to cool its bearings. However, in order to protect the rotary valve itself from harm attributable to the hot gases, it is preferred to provide a continuous low-volume flow of air to the downstream side of the rotary valve, that is to that side of the valve which is nearer to the resonance tube.
  • valve specified in general terms above has the particular advantage that, when the sound generator is in operation and producing sound impulses, the valve allows the pulsed air to pass through without restriction or otherwise distorting the impulses and thus reducing the efficiency of the generated sound.
  • the invention includes a system wherein two or more resonance tubes are connected to receive sound pulses produced by a single generator, a valve of the above-defined type being included in each of the connecting lines from the sound generator to one of the resonance tubes.
  • the present system may be used for more than two boilers.
  • Two factors determine the maximum number of boilers to which the system may be applied. Firstly, it is important that the sound generator should not be too distant from any boiler since otherwise any loss of sound intensity between the sound generator and the respective resonance tube may be excessive. It is preferred that the distance apart of the sound generator and any associated resonance tube should not exceed about eight metres.
  • the total desired lapsed time between successive operations of any one resonance tube may limit the number of cleaning operations which can take place. Nonetheless, within the two foregoing constraints, it has proved possible to envisage as many as seven economisers being cleaned at 20-minute intervals with a single sound generating system according to the invention.
  • the illustrated sound generator comprises a generally cylindrical housing 3 closed by an end plate 4. Supported on bearings 5, 5 and within the housing 3 is a shaft 6 to which is secured a generally cylindrical rotor 7.
  • the rotor 7 is open at one end 8 and has in its cylindrical side wall a circular aperture 9.
  • An air inlet 10 is provided in the cylindrical wall of the housing 3 and an air outlet 11, also in the cylindrical wall of the housing 3, is disposed with its axis in a plane at right angles to that of the axis of the inlet 10.
  • the rotor 7 is aligned with the air outlet 11 such that, in each rotation of the rotor 7, the aperture 9 coincides once with the air outlet 11.
  • air introduced at the air inlet 10 is expelled at the air outlet 11 in pulses at a frequency directly corresponding to the frequency of rotation of the rotor 7.
  • the shaft 6 is driven by a belt drive (not shown) applied to a pulley 12 and driven by an electric motor (also not shown). If the motor is rotated at, say, 1200 revolutions per minute, infrasonic pulses are delivered from the air outlet 11 at a frequency of 1200 per minute, which corresponds to a sound at 20 Hz frequency.
  • the sound generator is designated by the reference numeral 13.
  • Air from the ship's compressor is introduced via a supply line 14, at a pressure of the order of 7 - 8 bar,to an air receiver 15.
  • a master valve 16 controls the flow of air into the sound producer.
  • sound pulses generated therein are conveyed by air supply line 17 to resonance tubes 18, 19 and 20 respectively.
  • Butterfly valves 21, 22 and 23 are interposed in the lines to the respective resonance tubes.
  • the respective resonance tubes are linked by bellows 24, 25 and 26 to economisers 27, 28 and 29.
  • An air cooling line 30 bypasses master valve 16 and butterfly valves 21, 22 and 23 and provides a continuous low-volume supply of air to the resonance tubes. Since the internal diameter of the air cooling line 30 may be as little as, say, 3 mm, the continuous air consumption is at a very low level.
  • the operation of the sound producing system, and in particular of the various valves and of the sound producer 13 itself, may be controlled automatically by a control box.
  • the following is a typical operational cycle of the system:-
  • the illustrated embodiment has been described specifically as applied to three economisers but it may, as already described, be applied to a larger number of economisers subject to the limitations set forth above.
  • the sound producing system according to the present invention is envisaged as having application in other situations where infrasonic air is required, for example for airing clothes on a commercial scale or for encouraging the flow of pulverulent products such as dried cement in hoppers and/or delivery pipes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Exhaust Silencers (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
EP88306493A 1987-07-22 1988-07-15 Schallerzeugungsanordnung Withdrawn EP0300696A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878717312A GB8717312D0 (en) 1987-07-22 1987-07-22 Sound generating system
GB8717312 1987-07-22

Publications (2)

Publication Number Publication Date
EP0300696A2 true EP0300696A2 (de) 1989-01-25
EP0300696A3 EP0300696A3 (de) 1990-06-13

Family

ID=10621096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88306493A Withdrawn EP0300696A3 (de) 1987-07-22 1988-07-15 Schallerzeugungsanordnung

Country Status (2)

Country Link
EP (1) EP0300696A3 (de)
GB (2) GB8717312D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004009255A1 (en) * 2002-07-22 2004-01-29 Mats Olsson An air-driven low frequency sound generator and a method for regulating the piston in such a generator
RU2293274C1 (ru) * 2005-04-28 2007-02-10 Научно-Производственное Частное Унитарное Предприятие "Риорита" Способ очистки элементов и систем отопления и горячего водоснабжения от твердых отложений и устройство для его реализации

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5082502A (en) * 1988-09-08 1992-01-21 Cabot Corporation Cleaning apparatus and process
GB201200876D0 (en) * 2012-01-19 2012-02-29 Haines David Acoustic cleaning apparatus
WO2015008010A1 (en) 2013-07-18 2015-01-22 David Haines Acoustic cleaning apparatus
CN113706798B (zh) * 2021-07-28 2023-10-31 杭州中伦信号技术有限公司 一种警报器

Family Cites Families (2)

* 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
SE362305B (de) * 1971-02-12 1973-12-03 Kockums Mekaniska Verkstads Ab

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004009255A1 (en) * 2002-07-22 2004-01-29 Mats Olsson An air-driven low frequency sound generator and a method for regulating the piston in such a generator
RU2293274C1 (ru) * 2005-04-28 2007-02-10 Научно-Производственное Частное Унитарное Предприятие "Риорита" Способ очистки элементов и систем отопления и горячего водоснабжения от твердых отложений и устройство для его реализации

Also Published As

Publication number Publication date
GB8717312D0 (en) 1987-08-26
GB2207543A (en) 1989-02-01
GB2207543B (en) 1991-05-29
GB8816674D0 (en) 1988-08-17
EP0300696A3 (de) 1990-06-13

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