EP0404801A1 - Silencer for a gas flow. - Google Patents
Silencer for a gas flow.Info
- Publication number
- EP0404801A1 EP0404801A1 EP89903496A EP89903496A EP0404801A1 EP 0404801 A1 EP0404801 A1 EP 0404801A1 EP 89903496 A EP89903496 A EP 89903496A EP 89903496 A EP89903496 A EP 89903496A EP 0404801 A1 EP0404801 A1 EP 0404801A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- envelope
- silencer
- metal wire
- lining
- 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
Links
- 230000003584 silencer Effects 0.000 title claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 239000006262 metallic foam Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000009940 knitting Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 abstract description 5
- 230000035939 shock Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 20
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
- F01D25/02—De-icing means for engines having icing phenomena
-
- 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
- F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members
-
- 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
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/04—Metallic wool, e.g. steel wool, copper wool 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
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/14—Wire mesh fabric, woven glass cloth or the like
Definitions
- the present invention relates to a muffler injector or ejector for the expansion of a gaseous fluid and, more particularly, to a blowing device equipped with a set of such mufflers.
- the expansion of a fluid such as a gas is an operation which generates acoustic emissions which it is important to eliminate or at least reduce to a level considered tolerable, so as to attenuate the harmful sound and / or mechanical effects of these emissions. This is particularly the case when it is desired to relax gases or vapors to the atmosphere, empty pressurized gas tanks, relax hot air to defrost air intake filters for gas turbines or gas compressors, for example.
- the injectors or ejectors of gas or vapor used in such applications include holes or openings through which the gas to be expanded enters an environment at atmospheric pressure.
- the acoustic emissions are reduced by externally covering the part of the injector or ejector which has these lights with a piece of sintered metal, or of sintered plastic.
- This arrangement is not without drawbacks.
- clogging of the sintered part by materials entrained by the gas to be expanded. is to be feared, due to the low porosity of the sintered part.
- a silent expansion of the gas is provided by having, externally, on an exhaust pipe, an expansion chamber, a throttling member or other exhaust means, a more or less extensive and thick annular lining, this annular lining being able to be made of various materials such as, for example, a metallic wool or fabric, a wool of glass or synthetic fibers, asbestos fibers, metal shavings or wood, metal fabrics or knits.
- a metallic wool or fabric such as, for example, a metallic wool or fabric, a wool of glass or synthetic fibers, asbestos fibers, metal shavings or wood, metal fabrics or knits.
- Examples of such silent expansion devices are described in French patents No. 1,561,483, 2,250,379, 2,372,373 and 2,498,681. It will be noted that the linings used in these examples increase, due to their annular shape, the size of the devices fitted with these linings, for the same volume of acoustically absorbent lining used.
- the object of the present invention is to produce a muffler injector or ejector for the expansion of a gaseous fluid which does not have the drawbacks or blockage of the mufflers of the prior art.
- the present invention also aims to achieve such a silencer composed of standard, simple and interchangeable members, so as to lend itself to an inexpensive embodiment.
- the present invention also aims to achieve such a silencer which is in the form of a removable cartridge easy to install or replace in a device equipped with such silencers.
- an injector silencer or ejector for the expansion of a gaseous fluid comprising a member for mounting the silencer on a source of this fluid. and a casing having a first end covered by a throttle piece carried by this member so as to communicate internally with the source of fluid, this casing having a second end distant from the first and pierced with lights for passage through an external medium of the fluid admitted into the envelope, characterized in that the throttle piece has a total opening section dimensioned to establish a subsonic flow at low speed of the fluid on the source side and to raise the sonic flow of the fluid through this piece, and a gasket in wire completely filling the interior space of the envelope, from the perforated part to the second end of this envelope, with interior covering of the openings in this second end of the envelope.
- the lining is constituted by a knitted wire, formed in a tight roll.
- this lining takes the form of a metallic fabric in a tight roll or even of a metallic foam with open cells.
- the present invention also provides a device for blowing a gaseous fluid over an extended surface, equipped with a set of silencers according to the invention, characterized in that it comprises several parallel ramps mounted on a common collector itself connected at a source of a gaseous fluid, each ramp carrying several injector silencers or fluid ejectors regularly distributed and oriented so that the gaseous fluid is uniformly distributed by all of the silencers over the entire surface to be treated by blowing.
- FIG. 2 is a longitudinal sectional view of one of the silencers according to the invention mounted on the device of Figure 1.
- the blowing device shown in FIG. 1 is installed, by way of nonlimiting example of application of the invention, opposite the inlet section 1 of a gas turbine or compressor (not shown ).
- This inlet section is usually equipped with one or more filters which can, in wet and cold weather, become clogged with ice, thereby cutting off the air intake, or at least reducing it. In this case, it is then necessary to unblock the air inlet by melting the ice, for example using a blow of hot air in the filter.
- the device of FIG. 1 comprises a source of pressurized hot air (not shown), supplying along the arrow F a pipe 2 provided with an adjustment valve 3.
- the silencers 6, 6 ′ which simultaneously act as injectors, achieve a sonic silent expansion of the hot gases. Thanks to the silencers according to the invention, a good distribution of the hot air is obtained in the air inlet section 1 and it is possible to use, between the valve 3 and these silencers, small diameter pipes, therefore less costly, in which the pressure can be adjusted, by dimensioning the passage section of the throttle piece, to a value between 5 and 15 bars, or more if the source of hot air allows.
- the first end of this tubular casing is mounted in a mounting member 10 taking the form a nozzle for fixing the silencer to a source of gas fluid supply (not shown in Figure 2).
- the end piece 10 is fixed by screwing or welding to the source to ensure communication between the source and the casing 7 of the silencer, through the throttle piece 8. This rests on an annular shoulder 11 formed in the bore 12 of this end piece which receives the adjacent end of the tubular casing 7.
- the end piece 10 can be a commercial end-piece produced by turning or forging and has a thread for fixing the casing 7. This this could also be soldered on this tip.
- An essential characteristic of the silencer according to the invention, linked to the presence of shock waves downstream of the plate 8, is that the tubular casing 7 is completely filled, from the perforated plate 8 to the disc 9, a lining 14 made of fine metallic wire (inside 1 mm), of the knitted or tightly wound fabric type.
- the length L of the lining must not be less than 20 mm for an envelope 7 of small diameter and must be between 20 and 300 mm, if possible, whatever the diameter of the envelope.
- the porosity of such a knitted fabric is greater than 80%.
- the operation of the silencer according to the invention is then established as follows.
- the gas which enters the envelope 7 undergoes a sonic expansion at the level of the plate 8 and the metal wire lining, 14 then reduces the noise of the trigger by stabilizing and splitting the shock waves and by homogenizing the flow. Thanks to the fact that it internally covers the lights 13, 13 ', 13 ", ..., the lining also reduces the emission towards the outside of noises generated by the passage of gas through these lights.
- the presence of a sonic flow prevents any noise from rising upstream, therefore in the rest of the installation.
- the increase in pressure in the installation due to the choke piece, has the effect, for the same mass flow, to reduce the speed of the fluid and therefore the noise in the supply. Downstream of the plate 8, the flow takes place at low speed and at low pressure and the tubular casing 7 is therefore not subjected to high internal pressures.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Silencers (AREA)
- Pipe Accessories (AREA)
Abstract
Le silencieux comprend une enveloppe tubulaire (7) portée par un embout (10) de fixation sur une source d'alimentation en gaz sous pression à détendre. Une plaque (8) percée de trous et un disque (9) ferment les extrémités de l'enveloppe qui est percée de lumières d'échappement (13, 13', 13''...) au voisinage du disque (9). Suivant l'invention, le gaz s'écoule à vitesse sonique à travers la plaque (8) pour entrer dans l'enveloppe (7) entièrement remplie d'une garniture (14) constituée d'un rouleau serré d'un tricot de fil métallique. Cette garniture absorbe les ondes de choc développées par l'écoulement supersonique du gaz dans la garniture. Celle-ci maintient un écoulement subsonique peu bruyant à l'amont du silencieux. Application au traitement d'une surface par soufflage d'un fluide gazeux.The silencer comprises a tubular casing (7) carried by an end piece (10) for fixing to a pressurized gas supply source to be expanded. A plate (8) pierced with holes and a disc (9) close the ends of the casing which is pierced with exhaust ports (13, 13', 13''...) in the vicinity of the disc (9). According to the invention, the gas flows at sonic speed through the plate (8) to enter the envelope (7) completely filled with a filling (14) consisting of a tight roll of a knitted yarn metallic. This gasket absorbs the shock waves developed by the supersonic flow of gas through the gasket. This maintains a quiet subsonic flow upstream of the silencer. Application to the treatment of a surface by blowing a gaseous fluid.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89903496T ATE97463T1 (en) | 1988-03-11 | 1989-03-09 | SILENCER FOR FLOWING GASES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8803183 | 1988-03-11 | ||
FR8803183A FR2628477B1 (en) | 1988-03-11 | 1988-03-11 | EJECTOR OR INJECTOR MUFFLER FOR THE EXPANSION OF A GASEOUS FLUID AND BLOWING DEVICE PROVIDED WITH AN ASSEMBLY OF SUCH A MUFFLER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0404801A1 true EP0404801A1 (en) | 1991-01-02 |
EP0404801B1 EP0404801B1 (en) | 1993-11-18 |
Family
ID=9364178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89903496A Expired - Lifetime EP0404801B1 (en) | 1988-03-11 | 1989-03-09 | Silencer for a gas flow |
Country Status (5)
Country | Link |
---|---|
US (1) | US5166479A (en) |
EP (1) | EP0404801B1 (en) |
DE (1) | DE68910816T2 (en) |
FR (1) | FR2628477B1 (en) |
WO (1) | WO1989008771A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003040527A1 (en) * | 2001-11-09 | 2003-05-15 | Bertin Technologies | Gas expansion silencer |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5473124A (en) * | 1994-01-31 | 1995-12-05 | Dipti Datta | Packless silencer |
US5809770A (en) * | 1995-07-31 | 1998-09-22 | Donaldson Company, Inc. | Silencer for a gas flow |
US6202785B1 (en) | 1999-06-02 | 2001-03-20 | 3M Innovative Properties Company | Muffler with acoustic absorption insert for limited clearance pneumatic device applications |
US6343672B1 (en) * | 2000-03-23 | 2002-02-05 | Nova Gas Transmission Ltd. | Blowdown and venting jet noise suppressor |
US7263995B2 (en) * | 2001-02-28 | 2007-09-04 | Hyperbaric Technology, Inc. | Hyperbaric oxygen therapy system controls |
ATE302339T1 (en) * | 2001-11-21 | 2005-09-15 | Dunlop Aerospace Ltd | ARRANGEMENT FOR SOUND ABSORPTION |
JP4188108B2 (en) * | 2003-03-10 | 2008-11-26 | 本田技研工業株式会社 | Exhaust silencer for internal combustion engine |
US7185678B1 (en) * | 2003-12-11 | 2007-03-06 | Nitram Energy, Inc. | Orifice plate diffuser |
DE202004011630U1 (en) * | 2004-07-24 | 2004-11-11 | Wabco Gmbh & Co.Ohg | Muffler for compressed air equipment |
FR2884293B1 (en) * | 2005-04-12 | 2007-05-18 | Sncf | ACOUSTICAL ATTENUATION DEVICE |
US7530427B2 (en) * | 2006-06-12 | 2009-05-12 | Briggs & Stratton Corporation | Exhaust deflector for a muffler |
US7530428B2 (en) * | 2006-06-12 | 2009-05-12 | Briggs & Stratton Corporation | Exhaust deflector for a muffler |
US20090014235A1 (en) * | 2007-07-13 | 2009-01-15 | Paccar Inc | Flow diffuser for exhaust pipe |
US7971432B2 (en) * | 2007-07-13 | 2011-07-05 | Paccar Inc | Flow diffuser for exhaust pipe |
DE102008029489A1 (en) * | 2008-06-20 | 2009-12-24 | Wabco Gmbh | Silencer for compressed air systems of vehicles |
AU2008359682B2 (en) * | 2008-07-25 | 2013-08-01 | Hatch Ltd. | Apparatus for stabilization and deceleration of supersonic flow incorporating a diverging nozzle and perforated plate |
FR2938501B1 (en) * | 2008-11-14 | 2011-01-21 | Airbus France | METHOD FOR REDUCING THE NOISE GENERATED BY AN ORIFICE IN AN ENERGY GAS FLOW |
US7984787B2 (en) * | 2009-01-23 | 2011-07-26 | Dresser-Rand Company | Fluid-carrying conduit and method with noise attenuation |
FR2955084B1 (en) * | 2010-01-12 | 2012-06-08 | Airbus Operations Sas | AIRCRAFT COMPRISING AT LEAST ONE NET FOR REDUCING THE AERODYNAMIC NOISE OF A STRUCTURAL ELEMENT OF SAID AIRCRAFT |
JP6137158B2 (en) * | 2014-12-18 | 2017-05-31 | 株式会社村田製作所 | Noise reduction device |
US10041506B2 (en) * | 2015-06-30 | 2018-08-07 | General Electric Company | System for discharging compressed air from a compressor |
US10704464B2 (en) | 2016-02-16 | 2020-07-07 | General Electric Company | Acoustic nozzles for inlet bleed heat systems |
US10520187B2 (en) * | 2017-07-06 | 2019-12-31 | Praxair Technology, Inc. | Burner with baffle |
US11391207B2 (en) | 2020-01-16 | 2022-07-19 | General Electric Company | Anti-icing system having a nozzle with a deflector plate and method |
US11473501B2 (en) | 2020-12-22 | 2022-10-18 | General Electric Company | Anti-icing for gas turbine system |
US11459951B2 (en) | 2020-12-22 | 2022-10-04 | General Electric Company | Anti-icing system with a flow-deflector assembly |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR825715A (en) * | 1936-12-07 | 1938-03-11 | Headen Keil Engineering Compan | Device for preventing the formation of ice on aircraft surfaces |
US2217979A (en) * | 1938-06-06 | 1940-10-15 | George Kisling | Apparatus for preventing ice formation on airplane surfaces |
FR1269772A (en) * | 1960-07-08 | 1961-08-18 | Eugene Maitre Ets | Improvements to silencers for pressurized gas exhaust |
US3672465A (en) * | 1970-10-15 | 1972-06-27 | Blatt Leland F | Gas exhaust silencer |
US3949828A (en) * | 1974-08-30 | 1976-04-13 | Barry Wright Corporation | Fluid exhaust silencer |
GB1547168A (en) * | 1975-09-25 | 1979-06-06 | British Gas Corp | Gas-flow noise reduction systems |
US4241805A (en) * | 1979-04-02 | 1980-12-30 | Vibration And Noise Engineering Corporation | High pressure gas vent noise control apparatus and method |
DE2933105C2 (en) * | 1979-08-16 | 1983-12-15 | Robert Bosch Gmbh, 7000 Stuttgart | silencer |
US4316523A (en) * | 1980-06-04 | 1982-02-23 | Boretti Napoleon P | Silencer for gas discharge devices |
US4324314A (en) * | 1980-09-30 | 1982-04-13 | Ross Operating Valve Company | Muffler |
US4375841A (en) * | 1981-06-18 | 1983-03-08 | Fluid Kinetics Corporation | Fluid flow apparatus for accommodating a pressure drop |
DE3124249A1 (en) * | 1981-06-19 | 1982-12-30 | Thyssen Edelstahlwerke AG, 4000 Düsseldorf | Silencer for pneumatic systems |
US4570745A (en) * | 1984-03-02 | 1986-02-18 | Southern Gas Association | Method and apparatus for minimizing pulsations in fluid transmission systems |
-
1988
- 1988-03-11 FR FR8803183A patent/FR2628477B1/en not_active Expired - Fee Related
-
1989
- 1989-03-09 DE DE68910816T patent/DE68910816T2/en not_active Expired - Lifetime
- 1989-03-09 US US07/571,580 patent/US5166479A/en not_active Expired - Lifetime
- 1989-03-09 WO PCT/FR1989/000099 patent/WO1989008771A1/en active IP Right Grant
- 1989-03-09 EP EP89903496A patent/EP0404801B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8908771A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003040527A1 (en) * | 2001-11-09 | 2003-05-15 | Bertin Technologies | Gas expansion silencer |
FR2832181A1 (en) | 2001-11-09 | 2003-05-16 | Bertin Technologies Sa | GAS RELAXATION MUFFLERS |
US7416050B2 (en) | 2001-11-09 | 2008-08-26 | Bertin Technologies | Gas expansion silencer |
Also Published As
Publication number | Publication date |
---|---|
EP0404801B1 (en) | 1993-11-18 |
WO1989008771A1 (en) | 1989-09-21 |
DE68910816D1 (en) | 1993-12-23 |
FR2628477B1 (en) | 1993-05-14 |
FR2628477A1 (en) | 1989-09-15 |
US5166479A (en) | 1992-11-24 |
DE68910816T2 (en) | 1994-06-09 |
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