FR2447069A1 - Sound absorbent cover for duct - has double wall around baffles with pressurisation in space to prevent clogging and contamination - Google Patents

Sound absorbent cover for duct - has double wall around baffles with pressurisation in space to prevent clogging and contamination

Info

Publication number
FR2447069A1
FR2447069A1 FR7901448A FR7901448A FR2447069A1 FR 2447069 A1 FR2447069 A1 FR 2447069A1 FR 7901448 A FR7901448 A FR 7901448A FR 7901448 A FR7901448 A FR 7901448A FR 2447069 A1 FR2447069 A1 FR 2447069A1
Authority
FR
France
Prior art keywords
duct
pressurisation
contamination
space
double 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.)
Withdrawn
Application number
FR7901448A
Other languages
French (fr)
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
Priority to FR7901448A priority Critical patent/FR2447069A1/en
Publication of FR2447069A1 publication Critical patent/FR2447069A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0336—Noise absorbers by means of sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/085—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using a central core throttling gas passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/027—Throttle passages
    • F16L55/02754—Throttle passages using a central core throttling the passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/027—Throttle passages
    • F16L55/02763—Throttle passages using an element with multiple tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • F23M20/005—Noise absorbing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/20—Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/13003—Means for reducing the noise in smoke conducing ducts or systems

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

The sound absorbent unit comprises an outer casing which fits into a fluid duct. This casing is equipped with baffles positioned across the duct and designed to absorb and nullify the sound waves. Each baffle has an inner core (4) of sound absorbing material which is enclosed within a perforated wall (6). This is then enclosed within a second perforated wall (5), the sapce between being dimensioned to suit the particular use. These spaces, corresponding to all baffles, are also connected to an auxiliary supply (B), providing a pressure higher than that in the duct.
FR7901448A 1979-01-16 1979-01-16 Sound absorbent cover for duct - has double wall around baffles with pressurisation in space to prevent clogging and contamination Withdrawn FR2447069A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7901448A FR2447069A1 (en) 1979-01-16 1979-01-16 Sound absorbent cover for duct - has double wall around baffles with pressurisation in space to prevent clogging and contamination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7901448A FR2447069A1 (en) 1979-01-16 1979-01-16 Sound absorbent cover for duct - has double wall around baffles with pressurisation in space to prevent clogging and contamination

Publications (1)

Publication Number Publication Date
FR2447069A1 true FR2447069A1 (en) 1980-08-14

Family

ID=9220996

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7901448A Withdrawn FR2447069A1 (en) 1979-01-16 1979-01-16 Sound absorbent cover for duct - has double wall around baffles with pressurisation in space to prevent clogging and contamination

Country Status (1)

Country Link
FR (1) FR2447069A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0764762A1 (en) * 1994-04-14 1997-03-26 Balcke-Dürr GmbH Silencer arrangement
EP0780636A3 (en) * 1995-12-18 1998-05-20 Carrier Corporation Sound inhibitor baffles
EP0971172A1 (en) * 1998-07-10 2000-01-12 Asea Brown Boveri AG Gas turbine combustion chamber with silencing wall structure
WO2002086294A1 (en) * 2001-04-24 2002-10-31 Wieser-Linhart Emil A J Mobile installation for silencing and cleaning exhaust gases of an internal combustion engine
EP1262666A3 (en) * 2001-05-30 2004-01-21 M & I Heat Transfer Products Ltd. Air inlet and outlet silencer structures for turbine
US6802690B2 (en) 2001-05-30 2004-10-12 M & I Heat Transfer Products, Ltd. Outlet silencer structures for turbine
NL1026879C2 (en) * 2004-08-19 2006-02-21 Aarding Thermal Acoustics B V Silencer, profile part and method for manufacturing a panel.
WO2008065361A1 (en) * 2006-12-01 2008-06-05 Robert Bosch Gmbh Thermal acoustic baffle
EP2252836A4 (en) * 2008-03-06 2015-02-25 Lindab Ab Sound absorbing baffle and arrangement for a baffle
CN108709044A (en) * 2018-05-23 2018-10-26 中国空气动力研究与发展中心低速空气动力研究所 A kind of pressure piping flow rectifying silencer

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0764762A1 (en) * 1994-04-14 1997-03-26 Balcke-Dürr GmbH Silencer arrangement
EP0780636A3 (en) * 1995-12-18 1998-05-20 Carrier Corporation Sound inhibitor baffles
EP0971172A1 (en) * 1998-07-10 2000-01-12 Asea Brown Boveri AG Gas turbine combustion chamber with silencing wall structure
WO2002086294A1 (en) * 2001-04-24 2002-10-31 Wieser-Linhart Emil A J Mobile installation for silencing and cleaning exhaust gases of an internal combustion engine
EP1262666A3 (en) * 2001-05-30 2004-01-21 M & I Heat Transfer Products Ltd. Air inlet and outlet silencer structures for turbine
US6802690B2 (en) 2001-05-30 2004-10-12 M & I Heat Transfer Products, Ltd. Outlet silencer structures for turbine
NL1026879C2 (en) * 2004-08-19 2006-02-21 Aarding Thermal Acoustics B V Silencer, profile part and method for manufacturing a panel.
EP1628004A1 (en) * 2004-08-19 2006-02-22 Aarding Thermal Acoustics B.V. Sound damper, sectional component and method for the production of a splitter
WO2008065361A1 (en) * 2006-12-01 2008-06-05 Robert Bosch Gmbh Thermal acoustic baffle
EP2252836A4 (en) * 2008-03-06 2015-02-25 Lindab Ab Sound absorbing baffle and arrangement for a baffle
CN108709044A (en) * 2018-05-23 2018-10-26 中国空气动力研究与发展中心低速空气动力研究所 A kind of pressure piping flow rectifying silencer

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Legal Events

Date Code Title Description
ST Notification of lapse