EP0434895A1 - Schalldämpfer und Verfahren zu dessen Herstellung - Google Patents

Schalldämpfer und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0434895A1
EP0434895A1 EP90111336A EP90111336A EP0434895A1 EP 0434895 A1 EP0434895 A1 EP 0434895A1 EP 90111336 A EP90111336 A EP 90111336A EP 90111336 A EP90111336 A EP 90111336A EP 0434895 A1 EP0434895 A1 EP 0434895A1
Authority
EP
European Patent Office
Prior art keywords
mass
fibres
housing
film
silencer
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Withdrawn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
EP90111336A
Other languages
English (en)
French (fr)
Inventor
Gerald Walsh
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.)
WALKER UK Ltd
Original Assignee
WALKER UK Ltd
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 WALKER UK Ltd filed Critical WALKER UK Ltd
Publication of EP0434895A1 publication Critical patent/EP0434895A1/de
Withdrawn legal-status Critical Current

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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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • 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
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/06—Inserting sound absorbing material into a chamber

Definitions

  • the present invention relates to a silencer suitable for use in conjunction with an internal combustion engine, for example a reciprocating piston engine.
  • a silencer is used to define a part of a path along which exhaust gases leave an engine and to reduce the transmission of noise along that path.
  • a silencer commonly comprises a hollow housing, a member defining a duct which extends through the interior of the housing and a fibrous body which lies between said member and the housing.
  • the housing and said member are formed of metal and the fibrous body comprises mineral fibres. Provision is made for communication between the interior of the duct and the space containing the fibrous body. The fibrous body attenuates sound transmitted from the internal combustion engine to the silencer.
  • GB 986377-A there is disclosed a method of manufacturing a silencer in which a mass of mineral or glass fibres is packed into a polyethylene envelope to form a flat package which is then bent into an annular form and is inserted into a housing of the silencer.
  • the polyethylene envelope will be degraded in consequence of being heated by exhaust gases from an associated engine.
  • the polyethylene envelope is formed, leaving one end open, the glass or mineral fibres are wound on to a mandrel, the mandrel is removed, the resulting, annular body of fibres is flattened and is then inserted into the envelope, the envelope is closed and the package is then bent into the annular shape suitable for insertion into the housing of the silencer.
  • This procedure includes a considerable number of steps which are of markedly different character. If these steps are performed by hand, the labour required to prepare the package and insert it into the silencer housing would contribute a considerable portion to the cost of the finished silencer. The provision of equipment for carrying out the steps automatically would be particularly expensive.
  • a silencer comprising a hollow housing, a member defining a duct which extends through the interior of the housing and a fibrous body which lies between said member and the housing, wherein a mass of fibres is placed around said member, a shrinkable film is placed around the mass, the film is shrunk to draw the fibres towards said member and the member, bearing the fibres and the shrunk film is inserted into the housing.
  • the mass of fibres is contracted.
  • the contracted mass can be introduced into the housing more easily than an unconfined mass of fibres can be introduced into the housing. Contraction of the mass of fibres is preferably most severe adjacent to an end of that mass which will be a leading end, when the mass of fibres is introduced the housing.
  • a silencer comprising a hollow housing containing a mass of fibres and a pipe extending through the mass of fibres inside the housing, wherein the mass of fibres is confined by a film and there is a substantial clearance space between the film and the housing.
  • the clearance space between the film and the housing is greater adjacent to one end of the mass of fibres than it is adjacent to an opposite end of the mass of fibres. Contraction of the transverse dimension of the mass of fibres more severely adjacent to an end of the mass which is a leading end when the mass of fibres is introduced into the housing facilitates insertion, either by hand or automatically.
  • FIGURE 1 shows diagrammatically a pipe and baffle assembly to be incorporated in a silencer, together with a mass of fibres to be incorporated in the silencer with the pipe and baffle assembly,
  • FIGURE 2 shows the pipe and baffle assembly with the mass of fibres wrapped around the pipe of that assembly and the assembly being enclosed by a film, together with means for heat sealing and cutting the film, and
  • FIGURE 3 shows the pipe and baffle assembly, together with a housing and end plate of the silencer.
  • a silencer which comprises an elongated housing 10, a pipe 11 which extends through the housing and a baffle 12 which is also disposed within the housing.
  • the baffle is annular and the pipe 11 extends through the central opening of the baffle.
  • the silencer further comprises annular end plates 13 and 14 which close opposite ends of the housing, the pipe 11 extending through the central openings of both end plates.
  • the silencer may comprise additional components.
  • the silencer may comprise more than one pipe, a first pipe extending into the housing from outside one end thereof and the second pipe extending into the housing from outside the other end thereof, provision being made within the housing for flow of exhaust gases from one pipe to the other.
  • apertures of various shapes and sizes may be pierced in the pipe.
  • the silencer further comprises a fibrous body which, in the completed silencer, lies outside the pipe 11 but inside the housing 10 and typically occupies a part of the housing, for example a part of the housing which extends from the baffle 12 to the end plate 14.
  • the fibres are mineral fibres which can withstand the action of hot exhaust gases from an internal combustion engine.
  • the housing 10, pipe 11 and baffle 12 are typically formed of steel.
  • the mass of fibres is provided in the form of a block having a shape approximating to that of a rectangular prism. It will be understood that the mass of fibres is readily deformable and is resilient.
  • the block 15 is typically cut from a relatively long roll.
  • the block 15 of fibres is wrapped around a part of the pipe 11 which projects from the baffle 12 in a direction away from the end plate 13. This wrapping operation may be performed by hand or by machine.
  • the pipe and baffle assembly, bearing the block 15 wrapped thereon is then placed in a wrapping of plastics film 16.
  • the film is conveniently provided as a roll of double thickness, the film having free edges at one end of the roll and a fold at the other end of the roll.
  • a length of film is drawn from the roll onto a table 17 as a double layer.
  • the uppermost layer of film is lifted away from the table and the lower layer of film to provide a space which receives the pipe and baffle assembly.
  • the upper layer of film is drawn over the pipe and baffle assembly and down to the lower layer of film on the table 17.
  • Heating and severing means 18 is then applied to the double layer of film to sever the portion of film containing the pipe and baffle assembly from the film extending to the roll and to heat seal the edges of the film wrapping containing the pipe and
  • the film 16 is a heat-shrinkable film.
  • the film envelope containing the pipe and baffle assembly is transferred from the table 17 to a conveyor which carries the envelope through a heating chamber. In this chamber, the film is heated sufficiently to shrink the film onto the pipe and baffle assembly.
  • the film draws the fibres towards the pipe 11 so that the mass of fibres is contracted. Contraction is most severe at an end of the mass of fibres remote from the baffle 12. Accordingly, an end portion of the mass of fibres remote from the baffle adopts an approximately conical form, having a taper with the smaller diameter remote from the baffle 12. Since the film extends over the baffle 12, the baffle inhibits contraction of the film towards the pipe 11 in the vicinity of the baffle.
  • the entire pipe and baffle assembly, bearing the mass of fibres, is enveloped by the film 16. It will be understood that the diameter of the baffle 12 is substantially equal to the internal diameter of the housing 10. Shrinking of the film 16 contracts the mass of fibres to a diameter somewhat less than that of the baffle 12 so that the mass of fibres can be inserted easily into the housing 10.
  • the conical form of an end portion of the mass of fibres facilitates insertion of the pipe and baffle assembly, bearing the mass of fibres, into the housing 10. Thus, this insertion may be performed by a machine or by hand without significant risk of a proportion of the mass of fibres remaining outside the housing or being transferred past the baffle 12.
  • the end plate 14 is applied to the housing and sealed to a protruding part of the pipe 11.
  • the end plate 13 is sealed to the housing.
  • the film-wrapped pipe and baffle assembly can be handled, transported and stored conveniently without risk of the mass of fibres becoming displaced from the pipe 11. Furthermore, the film-wrapped assembly is not unpleasant to handle. Movement and handling of the assembly does not release fibres into the atmosphere.
  • the film wrapping maintains the mass of fibres in a compressed condition so that there is a significant clearance space between the mass of fibres and the wall of the housing 10.
  • the clearance space is particularly large near to the end plate 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP90111336A 1989-12-09 1990-06-15 Schalldämpfer und Verfahren zu dessen Herstellung Withdrawn EP0434895A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8927893A GB2238735A (en) 1989-12-09 1989-12-09 Silencer and method of producing same
GB8927893 1989-12-09

Publications (1)

Publication Number Publication Date
EP0434895A1 true EP0434895A1 (de) 1991-07-03

Family

ID=10667716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111336A Withdrawn EP0434895A1 (de) 1989-12-09 1990-06-15 Schalldämpfer und Verfahren zu dessen Herstellung

Country Status (2)

Country Link
EP (1) EP0434895A1 (de)
GB (1) GB2238735A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999023367A1 (en) * 1997-11-04 1999-05-14 Eurotex Thermal Engineering Ltd. Sound muffling material and method of making thereof
WO2005005796A1 (en) * 2003-07-02 2005-01-20 Owens Corning Composites S.P.R.L. Muffler insert and method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7942237B2 (en) 2006-04-12 2011-05-17 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated reflective chamber
US7934580B2 (en) 2006-04-12 2011-05-03 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system
US7730996B2 (en) 2006-04-12 2010-06-08 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB986377A (en) * 1962-01-15 1965-03-17 Versil Ltd A new or improved package for use in an exhaust silencer
US4121686A (en) * 1977-06-09 1978-10-24 Keller Jr Moreau A Hollow sound-dampened structure
GB2065596A (en) * 1979-12-18 1981-07-01 Lancaster Glass Fibre Ltd Improvements in or relating to rigid inserts for silencers
EP0074220A2 (de) * 1981-08-26 1983-03-16 Lancaster Glass Fibre Limited Einsatz in Geräuschdämpfern

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB986377A (en) * 1962-01-15 1965-03-17 Versil Ltd A new or improved package for use in an exhaust silencer
US4121686A (en) * 1977-06-09 1978-10-24 Keller Jr Moreau A Hollow sound-dampened structure
GB2065596A (en) * 1979-12-18 1981-07-01 Lancaster Glass Fibre Ltd Improvements in or relating to rigid inserts for silencers
EP0074220A2 (de) * 1981-08-26 1983-03-16 Lancaster Glass Fibre Limited Einsatz in Geräuschdämpfern

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999023367A1 (en) * 1997-11-04 1999-05-14 Eurotex Thermal Engineering Ltd. Sound muffling material and method of making thereof
US6457555B1 (en) 1997-11-04 2002-10-01 Acousta-Fil Limited Sound muffling material and method of making thereof
WO2005005796A1 (en) * 2003-07-02 2005-01-20 Owens Corning Composites S.P.R.L. Muffler insert and method
US7077922B2 (en) 2003-07-02 2006-07-18 Owens Corning Composites S.P.R.L. Technique to fill silencers

Also Published As

Publication number Publication date
GB2238735A (en) 1991-06-12
GB8927893D0 (en) 1990-02-14

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