EP0165145B1 - Silencieux régénérable in situ pour ventilateur dans les installations de ventilation alimentées en air empoussiéré et procédé de régénération in situ de ce silencieux - Google Patents

Silencieux régénérable in situ pour ventilateur dans les installations de ventilation alimentées en air empoussiéré et procédé de régénération in situ de ce silencieux Download PDF

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Publication number
EP0165145B1
EP0165145B1 EP85400978A EP85400978A EP0165145B1 EP 0165145 B1 EP0165145 B1 EP 0165145B1 EP 85400978 A EP85400978 A EP 85400978A EP 85400978 A EP85400978 A EP 85400978A EP 0165145 B1 EP0165145 B1 EP 0165145B1
Authority
EP
European Patent Office
Prior art keywords
sound
layer
silencer
compressed air
retaining wall
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
EP85400978A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0165145A1 (fr
Inventor
Pierre Collod
Jean Louis 7 Rue Du Chemin De Fer Pawlak
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.)
Charbonnages de France CDF
Original Assignee
Charbonnages de France CDF
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 Charbonnages de France CDF filed Critical Charbonnages de France CDF
Priority to AT85400978T priority Critical patent/ATE36585T1/de
Publication of EP0165145A1 publication Critical patent/EP0165145A1/fr
Application granted granted Critical
Publication of EP0165145B1 publication Critical patent/EP0165145B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
    • E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1283—Manufacturing or assembly; Connectors; Fixations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

Definitions

  • the invention relates to sound attenuation silencers which are associated with fans supplied with dusty air; it also relates to a process for regenerating these silencers.
  • These silencers are generally cylindrical devices having an outer sheet metal wall against which is held an annular layer of a material with high soundproofing power, resistant to heat, humidity and compaction.
  • the sound-absorbing substance used can be rock wool, glass wool, open cell foam, clay foam, etc.
  • the internal wall of the silencer in contact with the air flow to be soundproofed consists of a perforated sheet, the internal face of this sheet holding the layer of soundproofing substance in place.
  • a central bulb analogous to a nucleus with a domed head of generally cylindrical or frustoconical shape. This bulb ensures better continuity of air flow and promotes the supply of the fan wheel. This bulb also contains soundproofing material held in place by a perforated sheet envelope. It also participates in noise reduction.
  • the main purpose of the invention is to achieve in situ regenerable silencers, if desired while the fans are running, which can be easily regenerated as often as needed to keep the noise level below of a fixed threshold.
  • a silencer for a fan composed of a tubular section containing a central inner core.
  • This inner core is constituted by a cylindrical volume of insulating material phonetically contained in a metallic envelope composed of assembled sheets.
  • the tubular section has a perimeter wall constituted by a thickness of material, phonetically insulating, covered with an external metallic envelope composed of assembled sheets.
  • the sheets of the outer wall and the inner core are independent of the insulating material; they are fixed to a general structure and assembled together using bolts, so that it is necessary, laboriously, to dismantle the bolts and remove the sheets before accessing the insulating material and removing it entirely to replace it.
  • FR-A-2 205 625 also describes an acoustic insulation device for a ventilation fan used in mining operations.
  • an in situ regenerable silencer intended to be associated with a fan in a ventilation installation supplied with dusty air, comprising an outer casing made of solid material, a retaining wall located under this casing outer, a layer of sound-absorbing material with an outer face, contained by said retaining wall, an internal perforated wall supporting said layer of sound-absorbing material
  • the retaining wall has large passage openings while the outer casing is in solid sheet metal and it is separated radially from the retaining wall by an interval revealing a closed volume, the latter being either connected to an end piece external to the silencer for connection to a supply line for a cleaning fluid, or occupied at least partially by a layer of insulating material lining the inner face of said outer envelope, this co mlois opening panels hinged using hinges on said retaining wall.
  • the perforated internal wall which supports the soundproofing material comprises a cage constituted by perforated tubes and connected to a means of connection to a network of pressurized air.
  • the cleaning fluid is preferably constituted by water added with a detergent.
  • the regeneration of the layer of the sound absorbing material of the silencer is done in the following manner.
  • compressed air and the cleaning fluid are injected simultaneously into the annular volume comprised between the outer casing of the silencer and the layer of sound-absorbing material without stopping the fan.
  • the cleaning fluid mist passes through the layer of sound-absorbing material and entrains the dust into the air flow sucked in or blown out by the fan. Then one can either stop the introduction of cleaning fluid alone and then continue the introduction of air so as to dry the layer of sound-absorbing material, or simultaneously stop the introduction of cleaning fluid and compressed air.
  • the wet dust obtained during regeneration is not a nuisance.
  • the cleaning fluid is preferably prepared beforehand in a bottle of adequate capacity and resistance to pressure connected on the one hand to the annular volume located between the outer envelope and the layer of sound-absorbing material and on the other hand to a source of compressed air, a cut-off valve being mounted between the cylinder and the source of compressed air. Opening the valve sprays the cleaning fluid as a mist on the layer of sound-absorbing material. When all the cleaning fluid has been expelled from the bottle, drying can be ensured by continuing the introduction of compressed air.
  • a silencer it is preferable but not necessarily necessary to stop the fan before cleaning the layer of sound-absorbing material.
  • a removable panel is moved and a pressurized water jet is sprayed onto the soundproofing material with the addition of a detergent. This is done panel by panel.
  • the internal face of the layer of sound-absorbing material is supported by a rot-proof fabric of artificial fibers (polyamide, polyethylene) or non-combustible (glass fibers) with loose texture having more than 50% of empty surface.
  • This fabric has the advantage of not catching dust which facilitates its regeneration.
  • this fabric has a higher acoustic efficiency than a perforated sheet.
  • This fabric is itself supported by a sufficiently rigid mesh but with very loose mesh, for example in galvanized or plasticized wire. It can also rest on a metal cage.
  • This cage is formed of widely spaced metal bars oriented along the axis of the silencer. It has the advantage of protecting against the appearance of dangerous static electricity charges.
  • This metal cage is preferably constituted by tubes capable of being connected to a source of compressed air by means of a flexible hose and an electropneumatic valve; they are arranged so that, after connection, they play the role of ejectors whose jets are directed towards the blades of the fan. In addition to rapid drying of the soundproofing material after it has been washed, this assembly allows useful automatic emergency ventilation in the event of an accidental interruption of the electric current.
  • the external retaining wall of the layer of sound-absorbing material may consist of a metal cage or a sufficiently rigid mesh with loose mesh or holding in place a fabric with a loose texture.
  • the layer of sound-absorbing material can be formed in a known manner by rock wool, glass wool or any other porous material.
  • annular volume between the external sheet of the silencer and the layer of soundproofing material may be divided by partitions so as to form several boxes.
  • These boxes can be connected successively to the compressed air source. These boxes can be longitudinal or transverse.
  • the silencers When the silencers are provided with a central bulb, consisting of a soundproofing material held in place by an envelope, there is provided inside this layer of soundproofing material a central volume limited by an internal wall and connected to a connection end piece. a cleaning fluid inlet pipe.
  • the regeneration of the bulb is carried out in the same way as that of the annular layer of sound-absorbing material.
  • the regeneration of the bulb and the annular layer can be carried out simultaneously or independently.
  • the outer wall of the bulb is as in the case of the outer cylindrical wall of the annular layer of the sound absorbing material constituted by a mesh or a metal cage holding in place a fabric with a loose texture.
  • An in situ regenerable silencer comprises an outer casing 1 made of solid sheet which is separated, that is to say without definitive connection, from a layer of soundproofing material 2 which it contains.
  • an interval in the radial direction which causes an annular volume 3 to appear between the outer casing 1 and the sound-absorbing material 2.
  • This annular volume 3 is closed at its opposite ends in the axial direction and it is connected to a nozzle. compressed air and water containing detergent.
  • the soundproofing material 2 is supported on its internal face by a fabric 5 of loose-textured synthetic fibers which is itself supported by a rigid cage made up of tubes 6; the latter are perforated in their interior part to the silencer and, outside of the latter, they are connected to a flexible pipe 7 terminating in an electropneumatic valve 8 which is part of a compressed air distribution network.
  • the soundproofing material 2 is supported on its external face 9 by a fabric of synthetic fibers with a loose texture, preferably identical to the fabric 5 of the internal face, which rests on a semi-rigid metallic mesh with large meshes, made of plasticized wire of preference.
  • This external retaining wall 10, not shown in detail, is spaced from the external envelope 1 by the annular volume 3.
  • FIG. 3 shows in cross section a silencer similar to that of Figures 1, 2 where the same references designate the same parts.
  • This example is that of a first aspect of the invention according to which the outer casing 1 ′ in solid sheet is made up of removable panels.
  • a longitudinal rigid frame 11 carries hinges 12 by means of which panels 13 are pivotally mounted by one of their longitudinal edges; the opposite longitudinal edge makes it possible to fix each panel 13 to the frame 11, in the closed position.
  • the outer envelope 1 ′ is separated from the layer 2 of sound-absorbing material; however the annular volume 3 of Figures 1 and 2 is no longer necessary. It is therefore possible to fill the inner face of the panels 13 with a layer 14 of insulating material.
  • This FIG. 3 also shows that the rigid reinforcement 11 is used to hold the outer wall 10 of the layer of soundproofing material 2 in position using spacers 15.
  • the in situ regeneration consists with the silencer of FIGS. 1 and 2 in connecting the end piece 4 and in opening the valve 8 for cleaning and drying as explained above.
  • the silencer of Figure 3 we can either stop the fan, open all the panels 13 and send from the outside using a nozzle 16 a jet of pressurized water added with a detergent, which runs in one minute per m 3 of soundproofing material 2 cleaned. The water descends through the mass of the material 2. It is advisable to adhere to the lower part thereof a waterproof strip 17; by giving the entire installation a slight longitudinal slope, the washing water is collected, channeled and evacuated without difficulty.
  • the silencer of the invention differs in its construction from conventional silencers, it was useful to check the quality of sound reduction.
  • Lp 1, Lp 2, Lp 3 are the acoustic levels
  • Lp is the weighted surface sound pressure level
  • Lw is the sound power level according to standard NFS 31-021.
  • the acoustic attenuation coefficient is 22.1 dBA and for a conventional silencer it is only 18.4.
  • annular volume 3 it is possible to partition the annular volume 3 by transverse and longitudinal partitions to reveal boxes which can be connected all together or separately to the inlet pipe for the cleaning fluid.
  • these boxes can correspond to removable panels of the external envelope 1.
  • the internal wall and the external wall can be produced in many ways; but it is preferable in many circumstances to provide a support with a loose texture having more than 50% of empty surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Exhaust Silencers (AREA)
EP85400978A 1984-05-18 1985-05-17 Silencieux régénérable in situ pour ventilateur dans les installations de ventilation alimentées en air empoussiéré et procédé de régénération in situ de ce silencieux Expired EP0165145B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400978T ATE36585T1 (de) 1984-05-18 1985-05-17 In situ regenerierbarer geraeuschdaempfer fuer ventilator in, mit staubhaltiger luft gefoerderten ventilationsanlagen und in situ regenerierungsprozess dafuer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8407711A FR2564532B1 (fr) 1984-05-18 1984-05-18 Silencieux regenerables in situ pour ventilateurs dans les installations de ventilation alimentees en air empoussiere et procede de regeneration in situ de ces silencieux.
FR8407711 1984-05-18

Publications (2)

Publication Number Publication Date
EP0165145A1 EP0165145A1 (fr) 1985-12-18
EP0165145B1 true EP0165145B1 (fr) 1988-08-17

Family

ID=9304115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85400978A Expired EP0165145B1 (fr) 1984-05-18 1985-05-17 Silencieux régénérable in situ pour ventilateur dans les installations de ventilation alimentées en air empoussiéré et procédé de régénération in situ de ce silencieux

Country Status (5)

Country Link
EP (1) EP0165145B1 (enrdf_load_stackoverflow)
AT (1) ATE36585T1 (enrdf_load_stackoverflow)
DE (1) DE3564469D1 (enrdf_load_stackoverflow)
FR (1) FR2564532B1 (enrdf_load_stackoverflow)
IN (1) IN165301B (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8615909D0 (en) * 1986-06-30 1986-08-06 Tomac Mining Products Ltd Fan silencers
GB2256006B (en) * 1991-05-21 1995-02-22 Harbury Holdings Inc An exhaust system and a silencer therefor
AUPO910697A0 (en) * 1997-09-11 1997-10-02 Hrl Technology Pty Ltd Improved sound attenuating device
SE516302C2 (sv) * 1999-03-26 2001-12-17 Paroc Group Oy Ab Ljuddämparinsats för luft- eller gaskanaler
DE102005020303A1 (de) * 2005-04-30 2006-11-09 Volkswagen Ag Eine die Geräuschemission vermidernde Leitung sowie ein Verbrennungsmotor mit einer solchen Leitung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2056608A (en) * 1933-12-22 1936-10-06 C F Burges Lab Inc Silencer
US2073951A (en) * 1935-12-09 1937-03-16 Servais Services Ltd Silencer for gaseous currents
DE2254159C3 (de) * 1972-11-04 1979-09-27 Ferroplast Gesellschaft Fuer Metall- Und Kunststofferzeugnisse Mbh, 4322 Sprockhoevel Schalldämpfer für Luttenlüfter des Untertagebetriebes
US3949830A (en) * 1975-06-20 1976-04-13 George Koch Sons, Inc. Fan silencer
DE3111228C2 (de) * 1981-03-21 1986-07-31 Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg Verfahren und Vorrichtung zum Beseitigen von Ruß aus den Abgasen einer Brennkraftmaschine

Also Published As

Publication number Publication date
ATE36585T1 (de) 1988-09-15
IN165301B (enrdf_load_stackoverflow) 1989-09-16
FR2564532B1 (fr) 1986-09-12
EP0165145A1 (fr) 1985-12-18
FR2564532A1 (fr) 1985-11-22
DE3564469D1 (en) 1988-09-22

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