EP0153100B1 - Procédé et appareil pour le garnissage des silencieux d'échappement - Google Patents

Procédé et appareil pour le garnissage des silencieux d'échappement Download PDF

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Publication number
EP0153100B1
EP0153100B1 EP85300836A EP85300836A EP0153100B1 EP 0153100 B1 EP0153100 B1 EP 0153100B1 EP 85300836 A EP85300836 A EP 85300836A EP 85300836 A EP85300836 A EP 85300836A EP 0153100 B1 EP0153100 B1 EP 0153100B1
Authority
EP
European Patent Office
Prior art keywords
fibres
silencer casing
gas flow
casing
strand
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.)
Expired
Application number
EP85300836A
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German (de)
English (en)
Other versions
EP0153100A1 (fr
Inventor
Norman Robinson
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 EP0153100A1 publication Critical patent/EP0153100A1/fr
Application granted granted Critical
Publication of EP0153100B1 publication Critical patent/EP0153100B1/fr
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 ; 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
    • 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 a method of packing exhaust silencer casings and a silencer casing produced thereby.
  • Such silencer casings contain packing in order to assist in silencing exhaust gases from an engine by virtue of conversion of kinetic energy of the exhaust gases into mechanical displacements of the packing and thus heating thereof.
  • the fibre prefferably be "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 casing.
  • 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.
  • GB-A-1279 472 discloses apparatus in which discrete lengths of glass fibre are fed into one end of an exhaust silencer casing whilst air is drawn therethrough by a suction pump connected to the other end.
  • EP-A-91 413 discloses apparatus in which a continuous strand of glass fibre is formed into a continuous "wool sausage" by means of a nozzle, this is then blown into one end of a silencer casing with the assistance of a suction fan connected to the other end of the silencer casing.
  • a method of packing an exhaust silencer casing comprising the steps of: establishing gas flow into one end of the silencer casing and then out of the other end through a perforated tube passing therethrough; and allowing discrete lengths of fibres to be carried into the silencer casing in the gas flow, characterised in that the gas flow is passed through a restricted passageway before entering the silencer casing and a strand consisting of a plurality of fibres other than continuous glass fibres is chopped into discrete lengths upstream of the restricted passageway so that as the discrete lengths are formed they are carried by the gas flow through the restricted passageway and individual fibres in each discrete length separate from each other in a region of turbulence created thereby to form a wool-like material.
  • strand used in this specification refers to a plurality of fibres which may be twisted, plaited or laid parallel, A strand typically comprises 200-1600 fibres, The term “roving” refers to a bundle of strands. A roving typically comprises eight or more strands and may comprise over 500 fibres.
  • fiber refers to an elongate object, such as a filament, from which a wool-like material can be made.
  • apparatus for packing an exhaust silencer casing comprising: means for establishing gas flow into the casing, and means for chopping into discrete lengths a strand consisting of fibres other than continuous glass fibres, the arrangement being such that the chopped fibres are carried into the casing in the gas flow.
  • the apparatus for packing a silencer casing 1 shown in Figure 1 comprises vacuum producing apparatus 2, sealing apparatus 3 and a gun 4.
  • the silencer casing 1 is circular in cross-section, and one end thereof is closed by an end piece 5 which supports a perforated tube 6 extending through the silencer casing 1.
  • the end piece 5 also supports a stub pipe 7 which, in use, connects the silencer to the rest of the exhaust assembly.
  • a similar end piece (not shown) bearing a stub pipe is welded to the other end of the silencer casing 1 after it has been packed.
  • the vacuum producing apparatus 2 has a rubber sealing member 8 which fits tightly around the stub pipe 7.
  • a vacuum is produced in the apparatus by means of a centrifugal compressor (not shown) driven by a forty horse power (29.8 KW) motor (not shown). This produces a vacuum of around ten inches of mercury (33.9 KNm- 2 ) in the apparatus 2.
  • the sealing apparatus 3 likewise has a sealing member 9 and this seals against the open end of the casing 1 and also blocks off the open end of the peforated tube 6, as the tube 6 should not be filled with any packing material.
  • the sealing member 9 includes a circular aperture 10 whose diameter is 3/4 inch (19 mm) which provides communication between the interior of the sealing apparatus 3 and the interior of the casing 1.
  • the aperture 10 forms a restriction in the pathway from the gun 4 to the interior of the casing 1.
  • Figure 2 shows roving being fed into the gun 4 and discrete lengths of this being emitted from the gun 4.
  • the roving consists of a bundle of strands each of which consists of a plurality of fibres, e.g. at least 100 or at least 1000 fibres, of a mineral such as basalt, i.e. the material from which rockwool is made.
  • a mineral such as basalt, i.e. the material from which rockwool is made.
  • Other types of fibres which when "fluffed-up" form a wool-like material may be used, foe instance ceramic fibres.
  • the fibres typically have a diameter in the range of 6-12 microns.
  • the fibres in each strand may be twisted, plaited or laid parallel and the fibres may be continuous, i.e.
  • the roving fed into the gun 4 comprises eight or more strands so that each discrete chopped length thereof consists of a large number of fibres, e.g. over 2000 fibres.
  • the fibres Preferably, have a diameter of less than 30 microns or less than 15 microns.
  • the roving is fed into the gun 4 from a spool (not shown) containing a length of about two hundred meters of roving.
  • the gun 4 has an air-powered motor, contained in a housing 11, to which a rubber roller 12 is coaxially attached.
  • the roving is driven through the gun 4 by means of the rubber roller 12 and a steel roller 13 which is hard in contact with the rubber roller 12.
  • the roving is cut into discrete lengths by means of a cutter 14 mounted diametrically through a further roller 15 so that the cutter 14 extends along a generator of the roller 15. Every half revolution of roller 15, the roving is severed at the point of contact between the rollers 12 and 15.
  • the rollers 12, 13 and 15 are contained in a housing 16 (see Figures 3 and 4) having an inlet 17 and an outlet 18. Exhaust air 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 4 with the aid of a blast of this exhaust air.
  • a silencer casing 1 to be filled with packing is fitted onto the vacuum producing apparatus 2 and the sealing apparatus 3 is brought up to the open end of the casing 1.
  • the centrifugal compressor 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 fibre it is desired to pack into the particular silencer casing 1, 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 4.
  • the chopped lengths of roving projected from the gun 4 are all sucked through the aperture 10 in the sealing member 9 by the vacuum applied at the other end of the silencer casing 1, and the casing 1 is gradually filled with fibres. It has been found that the fibres in each chopped length of roving separate either before they enter the silencer casing 1 or while they are in the silencer casing 1 (probably the separation mainly takes place within the silencer), and this results in the production of the desired wool-like form of the fibres in the casing 1.
  • the air flow within the casing 1 will of course be turbulent since it is being sucked through the perforated tube 6. The fibres do not pass into the tube 6 themselves.
  • One advantage of the apparatus and method described is that it is possible to accurately meter the quantity of fibres with which each casing is packed. Also, the ducting require for handling wool-like glass fibre is not required.
  • the desired method and apparatus may be used to pack any form of silencer casing including those in which exhaust gases make multiple passes of the whole or part of the length of the silencer casing.
  • FIG. 5 A second embodiment of fhe apparatus according to this invention is shown in Figure 5. This apparatus differs from that shown in the previous figures in that no vacuum is required to draw the chopped roving into the silencer casing. Instead, the chopped roving is carried into the casing by an air flow.
  • a silencer casing 20 to be filled with packing is closed at the lower end as seen in Figure 5 by a closing plate 21 which has an aperture through which a perforated tube 22 of the silencer extends.
  • the silencer casing 20 is mounted on a platform 23 through which air can pass.
  • a closing plate 24 At the upper end of the silencer casing 20 as seen in the Figure is a closing plate 24 which carries a plug 25 for closing the upper end of the perforated tube 22.
  • Chopped strands of the roving are fed into the silencer casing 20 via a tube 26 and a conical member 27, the tube 26 being sealed in an aperture in the closing plate 24.
  • the tube 26 thus forms a restriction in the pathway from a gun 28 to the interior of the casing 20.
  • the gun 28 supplies chopped roving to the wide end of the conical member 27.
  • the gun 28 is similar to the gun 4 described except that the exhaust air thereof does not assist in projecting the chopped strands of roving from the gun 28, the chopped roving being projected from the gun 28 solely by the rotation of the rollers 12, 13 and 15.
  • a narrow tube 29 opens into the tube 26, and compressed air is supplied through the narrow tube 29 into the tube 26. It has been found that the compressed airfed into the tube 26 draws large quantities of air into the conical member 27, through the wide end thereof and hence through the tube 26 into the silencer casing 20. The chopped roving is therefore carried by this air flow into the silencer 20. The air flow leaves the silencer casing 20 via the perforated tube 22. It has been found that the fibres of the chopped roving are "fluffed-up" in this process, and that the silencer casing 20 is filled in a very satisfactory manner.
  • the narrow diameter of the tube 26 is important in “fluffing-up” the chopped roving, since only with a narrow diameter is sufficient turbulence created in the tube 26 to achieve this.
  • the narrow aperture 10 in the apparatus shown in Figure 1 is responsible for creating the necessary turbulence to cause "fluffing-up".
  • the narrower the diameter of the tube 26 or aperture 10 are smaller the compressed air pressure or vacuum needed to "fluff-up" the chopped roving.
  • the restriction is prone to clogging.
  • This invention also relates to any exhaust silencer casing packed in accordance with the method described above and to an exhaust system comprising such a silencer casing.

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

Claims (16)

1. Procédé de garnissage d'un boîtier (1; 20) de silencieux d'automobile, comprenant les stades de: établissement d'un courant d'air pénétrant à une première extrémité du boîtier (1; 20) de silencieux puis sortant à l'autre extrémité, et circulant dans un tube perforé (6; 22) disposé dans ce boîtier, et transport de tronçons distincts de fibres dans le boîtier (1; 20) du silencieux dans la courant de gaz, caractérisé en ce que le courant de gaz circule dans un passage (10; 26) de dimension restreinte avant de pénétrer dans le boîtier (1; 20) du silencieux, et un brin formé de plusieurs fibres autres que des fibres continues de verre est est découpé en tronçons distincts en amont du passage (10; 26) de dimension restreinte, afin que, lorsque les tronçons sont formés, ils soient transportés par le gaz dans le passage (10; 26) de dimension restreinte et que les fibres individuelles de chaque tronçon distinct se séparent les unes des autres dans une région de turbulence ainsi créée et pour former un matériau analogue à de la laine.
2. Procédé selon la revendication 1, dans lequel le brin est formé d'au moins cent fibres.
3. Procédé selon la revendication 2, dans lequel le brin est formé d'au moins mille fibres.
4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel les diamètres des fibres sont inférieurs à 30 Ilm.
5. Procédé selon la revendication 4, dans lequel les diamètres des fibres sont inférieurs à 15 Ilm.
6. Procédé selon l'une quelconque des revendications précédentes, dans lequel le brin contient des fibres minérales, par exemple des fibres de basalte, ou des fibres céramiques.
7. Procédé selon l'une quelconque des revendications précédentes, dans lequel le brin est avancé entre deux rouleaux (12, 13) qui sont en contact mutuel et dont l'un (12) est entraîné.
8. Procédé selon la revendication 7, dans lequel le brin passe entre deux rouleaux (12, 15) dont l'un (15) a un organe de coupe (14) monté diamétralement sur lui.
9. Procédé selon la revendication 7 ou la revendication 8, dans lequel les tronçons distincts sont projetés dans le passage (10, 26) avec l'assistance d'un flux de gaz soufflé.
10. Procédé selon l'une quelconque des revendications précédentes, dans lequel le diamètre du passage (10; 26) est inférieur à 25,4 mm.
11. Procédé selon la revendication 10, dans lequel le passage (26) est formé par l'extrémité étroite d'un tube (27) de forme tronconique dont l'extrémité large reçoit les tronçons distincts.
12. Procédé selon l'une quelconque des revendications précédentes, dans lequel le flux de gaz est établi par réduction de la pression à l'endroit où le flux de gaz quitte le boîtier (1; 20) du silencieux.
13. Procédé selon l'une quelconque des revendications précédentes, dans lequel le flux de gaz est établi à l'aide d'un jet d'air comprimé dirigé dans le passage (10; 26).
14. Procédé selon les revendication 11 et 13, dans lequel le jet est incliné par rapport à l'axe du tube (27) de forme tronconique.
15. Boîtier (1; 20) de silencieux d'échappement pour automobile, garni selon le procédé de la revendication 1 à l'aide de trançons distincts de fibres, autres que des fibres de verre, caractérisé en ce que les tronçons distincts bouffent afin de former une matière analogue à de la laine.
16. Boîtier (1; 20) de silencieux selon la revendication 15, incorporé à un ensemble d'échappement d'automobile.
EP85300836A 1984-02-14 1985-02-08 Procédé et appareil pour le garnissage des silencieux d'échappement Expired EP0153100B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08403787A GB2162577B (en) 1984-02-14 1984-02-14 Method of and apparatus for packing exhaust silencer casings
GB8403787 1984-02-14

Publications (2)

Publication Number Publication Date
EP0153100A1 EP0153100A1 (fr) 1985-08-28
EP0153100B1 true EP0153100B1 (fr) 1988-06-01

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ID=10556535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85300836A Expired EP0153100B1 (fr) 1984-02-14 1985-02-08 Procédé et appareil pour le garnissage des silencieux d'échappement

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EP (1) EP0153100B1 (fr)
JP (1) JPS60237113A (fr)
CA (1) CA1262711A (fr)
DE (1) DE3563089D1 (fr)
GB (1) GB2162577B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1009168C2 (nl) * 1998-05-14 1999-11-16 Scambia Ind Dev Ag Werkwijze en inrichting voor het vervaardigen van een geluiddemper.
US6148519A (en) * 1998-09-18 2000-11-21 Donaldson Company, Inc. Apparatus for installing a packing material in a muffler assembly; and methods thereof
US6467571B2 (en) 2000-12-11 2002-10-22 Nakagawa Sangyo Co., Ltd. Sound absorbing material, muffler using the sound absorbing material, and method for forming sound absorbing layer thereof
EP1217184B1 (fr) * 2000-12-14 2003-06-04 Nakagawa Sangyo Co., Ltd. Matériau absorbant acoustique, silencieux employant ce matériau absorbant acoustique, et procédé de formation d'un couche absorbante pour le silencieux

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091413A2 (fr) * 1982-04-06 1983-10-12 Scandinavian Glasfiber AB Récipient à travers lequel s'écoule un gaz, préférentiellement un silencieux, avec remplissage de fibres de verre, et procédé et dispositif pour le remplir

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
GB2127093B (en) * 1982-09-10 1986-01-29 Unipart Group Ltd Packing automobile exhaust silencer casing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091413A2 (fr) * 1982-04-06 1983-10-12 Scandinavian Glasfiber AB Récipient à travers lequel s'écoule un gaz, préférentiellement un silencieux, avec remplissage de fibres de verre, et procédé et dispositif pour le remplir

Also Published As

Publication number Publication date
GB8403787D0 (en) 1984-03-21
GB2162577A (en) 1986-02-05
GB2162577B (en) 1987-07-01
JPS60237113A (ja) 1985-11-26
CA1262711A (fr) 1989-11-07
EP0153100A1 (fr) 1985-08-28
DE3563089D1 (en) 1988-07-07

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