WO2004070174A1 - Amortisseur de bruit pour gaz chaud - Google Patents

Amortisseur de bruit pour gaz chaud Download PDF

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Publication number
WO2004070174A1
WO2004070174A1 PCT/EP2004/001026 EP2004001026W WO2004070174A1 WO 2004070174 A1 WO2004070174 A1 WO 2004070174A1 EP 2004001026 W EP2004001026 W EP 2004001026W WO 2004070174 A1 WO2004070174 A1 WO 2004070174A1
Authority
WO
WIPO (PCT)
Prior art keywords
wall
muffler
ptfe
gas
sound absorber
Prior art date
Application number
PCT/EP2004/001026
Other languages
German (de)
English (en)
Inventor
Wolfgang Riese
Original Assignee
Wolfgang Riese
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 Wolfgang Riese filed Critical Wolfgang Riese
Publication of WO2004070174A1 publication Critical patent/WO2004070174A1/fr

Links

Classifications

    • 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
    • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
    • 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
    • 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials

Definitions

  • the invention relates to a muffler for hot gas which flows through the muffler with an operating temperature in a predetermined temperature range.
  • the silencer has at least one flow channel for the gas and at least one wall delimiting the flow channel.
  • a typical field of application of the invention, to which the invention is not restricted, is the sound attenuation on compressors, especially screw compressors, for generating compressed air.
  • the compressed air emerging on the pressure side of a screw compressor typically has a temperature in the range from 200 ° C to 300 ° C, usually between 220 ° C and 280 ° C, in continuous operation.
  • a silencer of a particularly flat box construction is known, which is particularly suitable for attachment to the pressure side of screw compressors and has a good damping effect for the noise occurring on the pressure side of a screw compressor, especially for the high-frequency noise components.
  • the present invention is particularly suitable for use with a silencer of this known type, but is not limited to this type.
  • the invention has for its object to provide a silencer that has a good damping effect, in particular with regard to the high-frequency noise components, for a hot gas with a predetermined operating temperature, such as Compressed air generated by a screw compressor.
  • thermoplastic material which is in the softened or plasticized state at the operating temperature of the hot gas is outstandingly suitable for absorbing high-frequency sound waves in the gas and absorbing them in an energy-consuming manner.
  • 1 is a plan view of the muffler of the type known from DE 100 11 023 AI,
  • Fig. 2 is a side view of the muffler
  • Fig. 3 is a plan view of the muffler similar to Fig. 1, but with the top wall removed
  • Fig. 5 and 6 in the same representation as Fig. 3 and Fig. 4 shows a modified embodiment of the silencer.
  • Fig. 7 in the same representation as Fig. 4, an embodiment of the silencer designed according to the present invention.
  • the muffler shown consists of a housing 1 of flat box shape with a bottom wall 3, a top wall 5 and peripheral walls 7.
  • an inlet opening 9 is provided for compressed air supplied by the compressor.
  • the outlet opening 11 for the sound-damped compressed air, namely laterally offset from the inlet opening 9 near a side wall of the housing 1.
  • the housing 1 is essentially rectangular, apart from an indentation 13 provided next to the outlet opening 11, which creates space for the attachment of a pressure relief valve 14.
  • the outlet opening 11 preferably has a substantially larger cross section than the inlet opening 9.
  • the diameter of the outlet opening 11 can be more than twice the diameter of the inlet opening 9.
  • the housing 1 has the shape of a flat box or a disk. This means that the height of the housing is less than half and preferably less than a third of the width and / or length of the housing.
  • the interior of the housing 1 enclosed by the bottom wall 3, the top wall 5 and the peripheral walls 7 is divided into two flat chambers by a partition wall 15 running parallel to the bottom wall 3 and top wall 5, namely an inlet chamber 17 and an outlet chamber 19.
  • the partition wall 15 has a passage area 21, which is formed by numerous closely arranged small openings or perforations, which connect the inlet chamber 17 with the outlet chamber 19.
  • the passage region 21 is laterally offset from the inlet opening 9 and the outlet opening 11 on the side of the inlet opening 9 opposite to the outlet opening 11.
  • the partition 15 is impermeable outside the passage region 21.
  • the compressed air entering the inlet opening 9, which impinges on the impermeable part of the partition wall 15, is forced into a flow path which runs from the inlet opening 9 parallel to the bottom wall 3 and partition wall 15 through the inlet chamber 17 to the passage area 21, then finely distributed through the small openings of the passage area 21 into the outlet chamber 19, and then along the outlet chamber 19 parallel to the top wall 5 and bottom wall 3 to the outlet opening 11 and exits from this, as indicated in Fig. 4 by the arrows.
  • the diameter of the small openings forming the passage area 21 is preferably chosen to be as small as possible in order to achieve the finest possible division of the air flow in order to achieve effective sound absorption. On the other hand, the openings should not be so small that they are susceptible to clogging by dust particles or the like carried in the compressed air.
  • the diameter of the small openings of the passage area 21 is disadvantageously in the range from 1 to 10 mm, preferably it is approximately 5 mm.
  • the number of small openings forming the passage area 21 is preferably selected in relation to the diameter of the openings such that the sum of the cross sections of all openings, ie the total diameter let cross section of the passage region 21, equal or larger, preferably at least twice as large as the cross section of the inlet opening 9.
  • the partition 15 is arranged in such a way that the clear height of the outlet chamber 19 is significantly greater than the clear height of the inlet chamber 17.
  • the clear height of the outlet chamber 19 can be 1.8 to 2.2 -fold, preferably twice the inside height of the inlet chamber 17.
  • the housing 1 of the muffler is constructed so that it is composed of three superimposed, generally plate-shaped molded parts, namely a base plate 23 forming the bottom wall 3, an intermediate part 25, which comprises the partition wall 15 and most of the peripheral walls 7, and a cover plate 27, the cover wall 5 with the outlet opening 11 comprises.
  • the three molded parts 23, 25 and 27 are preferably formed from aluminum in a sand casting process. They lie one above the other at horizontal connecting joints and are held together by screws 29 which are provided around the circumference of the housing in the region of the circumferential walls 7.
  • top wall 5 and partition wall 15 In order to additionally support the bottom wall 3, top wall 5 and partition wall 15, four columns 31 are provided around the inlet opening 9, which, for example, can be molded onto the partition wall 15 and through which connecting screws (not shown) can also extend.
  • the dimensioning of the muffler according to the invention depends on the compressed air volume flow generated by the respective compressor type and required by the downstream consumer, the diameter of the outlet opening 11 being primarily the size which must be adapted to the existing conditions.
  • the clear height of the inlet chamber 17 is advantageously 0.2 to 0.3 times, preferably 0.25 times this diameter.
  • the respective specific dimensioning should also be chosen from the point of view that the flow resistance of the muffler should be as low as possible if the sound insulation is aimed for.
  • the described construction of the muffler enables an effective reduction in the outlet noise level of a screw compressor, with a reduction in the noise level of, for example, 110 dB to the range of 80 dB being possible.
  • the silencer according to the invention is particularly suitable for use with screw compressors which have to be installed in limited space, for example on silo vehicles.
  • the silencer according to the invention can be placed directly on the compressor in the case of screw compressors of a modern design, the inlet opening 9 of the silencer being able to connect directly to the pressure outlet of the compressor.
  • the muffler according to the invention consists of corrosion-resistant material, preferably cast aluminum, aluminum cast in a sand mold is more advantageous than die-cast because of the low density and the resulting higher insulation value. It is completely free of loosely inserted insulation materials such as glass wool, mineral wool, metal mesh or the like, as are used in conventional silencers.
  • the muffler according to the invention is therefore particularly suitable for use with screw compressors for the pneumatic conveyance of sensitive goods, since there is no risk of contamination of the conveyed goods by corrosion particles or particles of loose insulation materials.
  • the weight of the silencer according to the invention is also lower than the usual silencer.
  • 5 and 6 show a modified embodiment of the muffler according to the invention, the modification being aimed at promoting the occurrence of the reflections described above. This is done through one or more reflection walls which extend through the outlet chamber 19 transversely to the flow path of the air, each reflection wall leaving one or more passage openings for the air.
  • the air entering the outlet chamber 19 in the passage area 21 first encounters a first reflection wall 35 as it flows to the outlet opening 11, which wall wall leaves two passage openings 39 exposed at both ends.
  • a second reflection wall 37 In the flow direction behind the first reflection wall 35 there is a second reflection wall 37, which is interrupted approximately in the middle by a passage opening 41.
  • the passage openings 39 of the first reflection wall 35 and the at least one passage opening 41 of the second reflection wall 37 are offset from one another, so that a tortuous flow path is forced on the air.
  • the flow cross section of the flow openings 39 of the first reflection wall 35 and / or the flow opening 41 of the second reflection wall 37 is preferably approximately the same size or larger than the cross section of the inlet opening 9.
  • Both the inflow opening 9 and the passage area 21 of the partition wall 15 are opposite each one on the underside of the intermediate plate 15 and the top wall 5
  • Layer 43 or 44 made of a thermoplastic, preferably PTFE.
  • Each PTFE layer 43 or 44 preferably consists of a stack of thin PTFE plates, e.g. 10 plates each with a wall thickness of 1 mm.
  • the thickness of the intermediate plate 15 or the cover plate 5 is preferably reduced, so that a recess for accommodating the PTFE plates 43 or 44 is formed.
  • a perforated plate 42 or 45 is preferably arranged in front of each of the PTFE layers 43 or 44.
  • Each perforated plate 42 or 45 is preferably made of metal, that is to say is a perforated plate.
  • Each perforated plate preferably has a multiplicity of holes with a diameter of approximately 5 mm.
  • each perforated plate can consist of V4A steel with a thickness of 1.5 mm or from an Al-Si-Mg alloy with a thickness of 3 mm.
  • the perforated plates 42 and 45 and PTFE plates 43 and 44 form a solid and indestructible unit with the material of the partition wall 15 or top wall 5 in the manner of a sandwich construction.
  • the perforated plates 42 and 45 and PTFE plates 43 and 44 can also be mechanically fastened to the partition 15 or top wall 5 by screws (not shown).
  • the silencer is arranged on the compressed air outlet side of a screw compressor, compressed air flows through it, the operating temperature of which is between 220 ° C and 280 ° C and is reached after a few minutes of operation. In this The temperature range becomes PTFE thermoplastic, but essentially does not lose its consistency. Experiments have shown that the transition of the PTFE to the thermoplastic state is excellently suited to absorbing and reducing high-frequency sound waves.
  • Wall layers made of plastic which becomes thermoplastic at operating temperature, can also be applied in other areas of the walls delimiting the flow path of the gas.
  • the attachment of the PTFE layers 43 and 44 shown in FIGS. 7 and 8 in the regions of the intermediate wall 15 or cover wall 5 opposite the inflow opening 9 or the throughflow openings 21, which represent impact and deflection surfaces for the compressed air, has, however, been found proven to be particularly effective because here the impact and the deflection of the hot compressed air result in a particularly intensive interaction with the thermoplastic plastic.
  • PTFE layers can also be applied to all inner surfaces of the muffler delimiting the flow path. It is particularly effective to attach PTFE layers to reflection walls which extend transversely to the direction of flow of the gas, for example to the reflection walls 35 and 37 shown in FIG. 5, against which the gas flows.
  • the coating of inner surfaces of the muffler with a plastic, such as PTFE, which softens at the operating temperature of the hot gas, can be carried out according to the invention in any muffler construction and is not restricted to the contraction described in FIGS. 1 to 6.
  • the muffler does not need to have an intermediate wall 15 and no numerous flow openings 21.
  • the construction can be modified so that the flow path of the gas has a cross section that extends over the entire clear height between the bottom wall 3 and the top wall 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne un amortisseur de bruit qui est destiné à un gaz chaud traversant l'amortisseur de bruit à une température de fonctionnement dans une plage de température prédéfinie, et qui comprend un conduit d'écoulement, délimité par des parois intérieures, pour le gaz. Selon l'invention, au moins une zone de paroi de la paroi intérieure est munie d'au moins une couche en matériau thermoplastique, par exemple en PTFE, dont la température de plastification se situe dans la plage de température prédéfinie, de préférence entre 200 °C et 300 °C. On obtient une atténuation sonore particulièrement efficace grâce à l'adaptation de la température de ramollissement du plastique à la température de fonctionnement du gaz.
PCT/EP2004/001026 2003-02-04 2004-02-04 Amortisseur de bruit pour gaz chaud WO2004070174A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20301721U DE20301721U1 (de) 2003-02-04 2003-02-04 Schalldämpfer für heißes Gas
DE20301721.8 2003-02-04

Publications (1)

Publication Number Publication Date
WO2004070174A1 true WO2004070174A1 (fr) 2004-08-19

Family

ID=32520281

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/001026 WO2004070174A1 (fr) 2003-02-04 2004-02-04 Amortisseur de bruit pour gaz chaud

Country Status (2)

Country Link
DE (1) DE20301721U1 (fr)
WO (1) WO2004070174A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3611768A1 (de) * 1985-06-10 1986-12-11 Günter 8900 Augsburg Miller Abgasfiltergeraet
EP0269116A2 (fr) * 1986-11-26 1988-06-01 Showa Denko Kabushiki Kaisha Silencieux d'échappement en résine pour moteurs à combustion interne
WO1989004915A2 (fr) * 1987-11-17 1989-06-01 Yamato Kogyo Company, Limited Systeme d'echappement de vehicule automobile pourvu d'un silencieux en resine combine avec un systeme de refroidissement des gaz d'echappement
EP0495763A1 (fr) * 1991-01-17 1992-07-22 Valmet Paper Machinery Inc. Atténuation des sons pour fréquences basses, en particulier pour canalisations d'air dans des papeteries
DE10011023A1 (de) 2000-03-07 2001-09-13 Wolfgang Riese Schalldämpfer für Kompressoren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3611768A1 (de) * 1985-06-10 1986-12-11 Günter 8900 Augsburg Miller Abgasfiltergeraet
EP0269116A2 (fr) * 1986-11-26 1988-06-01 Showa Denko Kabushiki Kaisha Silencieux d'échappement en résine pour moteurs à combustion interne
WO1989004915A2 (fr) * 1987-11-17 1989-06-01 Yamato Kogyo Company, Limited Systeme d'echappement de vehicule automobile pourvu d'un silencieux en resine combine avec un systeme de refroidissement des gaz d'echappement
EP0495763A1 (fr) * 1991-01-17 1992-07-22 Valmet Paper Machinery Inc. Atténuation des sons pour fréquences basses, en particulier pour canalisations d'air dans des papeteries
DE10011023A1 (de) 2000-03-07 2001-09-13 Wolfgang Riese Schalldämpfer für Kompressoren

Also Published As

Publication number Publication date
DE20301721U1 (de) 2004-06-09

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