EP0106481A2 - Packung des Abgasschalldämpfers von Kraftfahrzeugen - Google Patents

Packung des Abgasschalldämpfers von Kraftfahrzeugen Download PDF

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Publication number
EP0106481A2
EP0106481A2 EP83305077A EP83305077A EP0106481A2 EP 0106481 A2 EP0106481 A2 EP 0106481A2 EP 83305077 A EP83305077 A EP 83305077A EP 83305077 A EP83305077 A EP 83305077A EP 0106481 A2 EP0106481 A2 EP 0106481A2
Authority
EP
European Patent Office
Prior art keywords
silencer
casing
air flow
strand
fibres
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
Application number
EP83305077A
Other languages
English (en)
French (fr)
Other versions
EP0106481B1 (de
EP0106481A3 (en
Inventor
Norman Robinson
John Robert Grain
Ralph Huggett
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.)
Unipart Group Ltd
Original Assignee
Unipart Group 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 Unipart Group Ltd filed Critical Unipart Group Ltd
Publication of EP0106481A2 publication Critical patent/EP0106481A2/de
Publication of EP0106481A3 publication Critical patent/EP0106481A3/en
Application granted granted Critical
Publication of EP0106481B1 publication Critical patent/EP0106481B1/de
Expired 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
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/06—Inserting sound absorbing material into a chamber

Definitions

  • This invention relates to the packing of automobile exhaust silencers.
  • Such silencers contain packing in order to assist in silencing exhaust gases from the vehicle engine by virtue of conversion of kinetic energy of the exhaust gases into mechanical displacements of the packing and thus heating thereof.
  • One of the materials used to pack such silencers is glass fibre fluffed up into a wool-like consistency. This material can be produced by chopping continuous strands of glass fibre.
  • glass fibre material in wool-like form has been fed into a hopper, from which it passes along ducts before being metered into individual quantities, each suitable for packing one silencer.
  • the material has been prone to clog in the ducts and this has made the accurate metering of the material difficult, if the expense of weigh pans is to be avoided.
  • the invention provides a method of packing a silencer casing which comprises establishing an air flow into and out of the silencer casing, chopping into discrete lengths a strand consisting of a plurality of continuous glass fibres, and allowing them to be carried into the silencer casing in the air flow.
  • the strand, or roving advantageously contains at least one hundred, preferably at least a thousand, individual continuous glass fibres whose diameter is advantageously less than 30 microns and preferably less than 15 microns.
  • the fibres- of the roving are preferably non- twisted.
  • the roving is driven from two rollers in contact with each other; this makes it easy to meter accurate quantities of glass fibre into each silencer casing, since it is only necessary to leave the rollers running for a certain period of time in order to know exactly how much glass fibre has been fed into the silencer.
  • a roller may also be provided for chopping the fibres, and they may be projected with the assistance of an air blast.
  • the air flow leaves the silencer via a perforated tube of the silencer.
  • the air flows through a restriction, the diameter of which is less than one inch, before it enters the casing: the I fibre. is. fluffedup in the region of turbulence so created.
  • the restriction may be connected to a tapering tubular member at its narrow end, the wide end of which draws the fibers in.
  • the taper may be from 15° to 75 0 included angle.
  • the air flow may be produced by means of a vacuum applied to where the air flow leaves the casing.
  • the vacuum applied to the silencer casing may be at least one inch of mercury, preferably at least five inches of mercury, and advantageously between seven and a half and twelve and a half inches of mercury.
  • the air flow may be established by means of a jet of compressed air which draws fibers into the air flow before it enters the casing.
  • the jet preferably feeds into the restriction: it may be inclined at an angle 71 ⁇ 2° to 371 ⁇ 2° to the axis of the tubular member.
  • the compressed air' pressure should be at least 70 pounds per square inch.
  • the invention also provides a silencer casing packed in accordance with any of the forms of the method of the invention.
  • the first apparatus for packing a silencer casing 1 comprises a vacuum producing apparatus 2, a sealing apparatus 3 and a gun 4.
  • the casing of the silencer is circular in section, and one end of it has been closed by an end piece 5, which supports a perforated tube 6 running along the length of the silencer casing.
  • the end piece 5 supports a stub pipe 7 which connects to the rest of the exhaust assembly in use.
  • a similar end piece bearing a stub pipe is welded to the other end of the silencer when it has been packed. .
  • the vacuum producing apparatus has a rubber sealing member 8 which fits tightly around the stub pipe 7.
  • the vacuum is produced by means of a centrifugal compressor (not shown) driven by ⁇ forty horse power motor (not shown). This apparatus produces a vacuum of around ten inches of mercury.
  • the sealing apparatus 3 likewise includes a sealing member 9 which seals against the open end of the casing and also blocks off the open end of the perforated tube 6, since this must not be filled with any packing material.
  • the sealing member has a circular aperture 10 whose diameter is 4 inch.
  • the roving fed into the gun 4 consists of around two thousand mono-filamentary continuous glass fibres, whose diameters lie between about six and twelve microns.
  • the fibres in the roving are parallel to each other, that is, the roving is not twisted.
  • the roving is fed from a spool (not shown) containing a length of about a couple of hundred meters of the roving.
  • the gun has an air-powered motor, contained in housing 11, to which rubber roller 12 is coxially attached.
  • the roving is driven by means of rubber roller 12 and steel roller 13 which is hard in contact with roller 12.
  • the roving is cut into discrete lengths by means of a cutter 14 mounted diametrically through a further roller 15. Every half revolution of roller 15, the roving is severed at the point of contact with roller 12.
  • the rollers are ocntained in a housing 16 having an inlet 17 and an outlet 18.
  • the air exhaust from the air powered motor is fed into the housing 16 and, since the area of the outlet 18 is much greater than that of the inlet 17, the chopped lengths of roving are projected out of the gun with the aid of an air blast.
  • a silencer casing 1 to be filled is fitted onto the vacuum producing apparatus 2 and a sealing apparatus is brought up to the open end of the silencer.
  • the vacuum pump is started.
  • the gun 4 is then run and left running for a pre-determined period of time. This pre-determined period corresponds to the desired weight of glass fibre it is desired to pack the particular silencer with, and this can be calculated simply from the weight per unit length of the roving and the velocity at which the roving is fed through the gun.
  • the chopped lengths of roving projected from the gun are all sucked through the aperture 10 in the sealing member 9 because the vacuum applied at the other end of the silencer casing, and the silencer is gradually filled with glass fibre. It has been found that the fibres of each chopped length of roving separate either before they enter the silencer casing or while they are in the silencer casing (probably the separation mainly takes place within the silencer), and this results in the production of the desired wool-like form of the glass fibre in the silencer.
  • the air flow within the silencer will of course be turbulent since it is being sucked through the perforated tube 6. The lengths of fibre do not pass into the tube 6 themselves.
  • the invention is of course applicable to any form of silencer, for example, such as the form where exhaust gases make multiple passes of the whole the part of the length of the silencer casing.
  • the second form of apparatus differs from the first in that there is no vacuum required to draw the roving pieces into the silencer, rather they are drawn in carried in an air flow.
  • a silencer 20 to be filled is closed at the lower end as seen in the drawing by a closing plate 21 which has an aperture through which a perforated tube 22 of the silencer extends.
  • the silencer is mounted on a platform 23 through which air can pass.
  • the upper end of the silencer as seen in the drawing is connected to the apparatus, in particular to a closing plate 24 which carries a plug 25 for closing the end of the perforated tube 22.
  • the chopped strands of roving are fed into the silencer casing via a tube 26 and conical member 27, the tube 26 being sealed in anaperture in the closing plate 24.
  • a gun 28 supplies roving to the wide end of the conical member: the gun 28 is identical to the gun 4 of the first apparatus except that air does not assist in projecting the cut strands of roving from the gun, the cut strands being projected solely be the rotation of the rollers.
  • the roving used is the same as the first apparatus.
  • a narrow tube 29 opens into the tube 26, and compressed air is supplied to its other end.
  • tube 26 three inches long, one half inch diameter
  • conical member 27 semi-angle 30°, diameter at wide end, three inches
  • the narrow diameter of the tube 26 is important in "fluffing-up" the cut strands of roving, since only with a narrow diameter is sufficient turbulence created in the tube to achieve this. It is believed that the narrow opening 10 in the first apparatus is also responsible for creating the necessary turbulence. The narrower the diameter, the smaller the compressed air pressure or vacuum needed to fluff-up the fibre, but if the diameter is too small, the restriction is prone to clogging.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP83305077A 1982-09-10 1983-09-01 Packung des Abgasschalldämpfers von Kraftfahrzeugen Expired EP0106481B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8225865 1982-09-10
GB08225865A GB2127093B (en) 1982-09-10 1982-09-10 Packing automobile exhaust silencer casing

Publications (3)

Publication Number Publication Date
EP0106481A2 true EP0106481A2 (de) 1984-04-25
EP0106481A3 EP0106481A3 (en) 1984-07-18
EP0106481B1 EP0106481B1 (de) 1987-01-21

Family

ID=10532835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83305077A Expired EP0106481B1 (de) 1982-09-10 1983-09-01 Packung des Abgasschalldämpfers von Kraftfahrzeugen

Country Status (5)

Country Link
EP (1) EP0106481B1 (de)
JP (1) JPS59131717A (de)
CA (1) CA1240131A (de)
DE (1) DE3369360D1 (de)
GB (1) GB2127093B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153100A1 (de) * 1984-02-14 1985-08-28 Unipart Group Limited Verfahren und Einrichtung zur Verpackung des Abgasschalldämpfers
EP0146249A3 (en) * 1983-11-18 1987-03-25 Tba Industrial Products Limited Glass fibre products
AU582555B2 (en) * 1983-11-18 1989-04-06 Tba Industrial Products Limited Glass fibre products
WO2002075122A1 (en) * 2001-03-16 2002-09-26 Owens Corning Process for filling a muffler shell with fibrous material
WO2003023201A1 (en) * 2001-09-12 2003-03-20 Owens Corning Composites S.P.R.L. Muffler shell filling process and muffler filled with fibrous material
US6581723B2 (en) * 2001-08-31 2003-06-24 Owens Corning Composites Sprl Muffler shell filling process, muffler filled with fibrous material and vacuum filling device
US8590155B2 (en) 2009-06-03 2013-11-26 Ocv Intellectual Capital, Llc Apparatus for and process of filling a muffler with fibrous material utilizing a directional jet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6317561B2 (ja) * 2013-10-16 2018-04-25 株式会社Ｓｕｂａｒｕ 繊維充填装置および繊維充填方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1279472A (en) * 1969-10-30 1972-06-28 Harmo Ind Ltd Improvements in or relating to absorbent devices
SE445942B (sv) * 1982-04-06 1986-07-28 Volvo Ab Ljuddempare samt sett och anordning for framstellning av denna

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146249A3 (en) * 1983-11-18 1987-03-25 Tba Industrial Products Limited Glass fibre products
AU582555B2 (en) * 1983-11-18 1989-04-06 Tba Industrial Products Limited Glass fibre products
EP0153100A1 (de) * 1984-02-14 1985-08-28 Unipart Group Limited Verfahren und Einrichtung zur Verpackung des Abgasschalldämpfers
WO2002075122A1 (en) * 2001-03-16 2002-09-26 Owens Corning Process for filling a muffler shell with fibrous material
US6581723B2 (en) * 2001-08-31 2003-06-24 Owens Corning Composites Sprl Muffler shell filling process, muffler filled with fibrous material and vacuum filling device
WO2003023201A1 (en) * 2001-09-12 2003-03-20 Owens Corning Composites S.P.R.L. Muffler shell filling process and muffler filled with fibrous material
US6607052B2 (en) 2001-09-12 2003-08-19 Owens Corning Composites Sprl Muffler shell filling process and muffler filled with fibrous material
CN1316149C (zh) * 2001-09-12 2007-05-16 欧文斯康宁合成物有限公司 消音器外壳填充方法以及充填纤维材料的消音器
US8590155B2 (en) 2009-06-03 2013-11-26 Ocv Intellectual Capital, Llc Apparatus for and process of filling a muffler with fibrous material utilizing a directional jet

Also Published As

Publication number Publication date
CA1240131A (en) 1988-08-09
EP0106481B1 (de) 1987-01-21
DE3369360D1 (en) 1987-02-26
GB2127093B (en) 1986-01-29
GB2127093A (en) 1984-04-04
EP0106481A3 (en) 1984-07-18
JPS59131717A (ja) 1984-07-28

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