EP0426696A1 - An exhaust pipe and a method for manufacturing it - Google Patents

An exhaust pipe and a method for manufacturing it

Info

Publication number
EP0426696A1
EP0426696A1 EP89907334A EP89907334A EP0426696A1 EP 0426696 A1 EP0426696 A1 EP 0426696A1 EP 89907334 A EP89907334 A EP 89907334A EP 89907334 A EP89907334 A EP 89907334A EP 0426696 A1 EP0426696 A1 EP 0426696A1
Authority
EP
European Patent Office
Prior art keywords
rings
pipe
casing
exhaust pipe
exhaust
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Withdrawn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
EP89907334A
Other languages
German (de)
French (fr)
Inventor
Sven-Olof Malmsten
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.)
Dorchester Enterprises Ltd
Original Assignee
Dorchester Enterprises 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 Dorchester Enterprises Ltd filed Critical Dorchester Enterprises Ltd
Publication of EP0426696A1 publication Critical patent/EP0426696A1/en
Withdrawn legal-status Critical Current

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
    • 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
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • 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
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
    • F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/21—Rigid pipes made of sound-absorbing materials or with sound-absorbing structure
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/04—Metallic wool, e.g. steel wool, copper wool or the like

Definitions

  • the invention relates to an exhaust silencer of the type comprising an inner pipe, permeable to gas in radial di ⁇ rection, an outer casing and possibly a noise-suppressing material arranged between the pipe and the outer casing, in the form of mineral wool or metal wool such a steel wool or the like.
  • the invention also relates to a method of manufacturing such an exhaust pipe, particulary the inner pipe therefor.
  • the known technology is represented by Swedish Patents No. 73 11 076-9 and No. 85 00 785-4 and British Patent No. 1 191 125.
  • the basic idea is to produce a bendable exhaust silencer, but the previous designs have several drawbacks both as regards manufacture and also as regards forming the exhaust pipe to the desired shape to fit a particular model of vehicle.
  • One object of the invention is to provide a new exhaust silencer and a new method of manufacturing it, and also to offer a method for quickly and easily manufacturing an exhaust pipe which as well as being bendable to the desired shape, is also able to substantially maintain its axial length when bent, and even maintain its cross section. Further aims and advantages of the invention are revealed in the following description or will be obvious to one skilled in the art who studies the description.
  • an exhaust silencer of the type comprising an inner pipe, permeable to gas in radial direction, an outer casing and possibly a noise-suppressing material arranged between pipe and casing
  • the exhaust pipe is charac ⁇ terised in that the inner pipe is formed from perforated rings of strip material, joined together axially, said rings when considered in axial section having outwardly concave cross section, with cross-sectional legs of diffe- rent lengths, the rings being flexibly jointed to each other, the longer flange of one ring being upset over the shorter flange of an adjacent ring.
  • the pipe sections of the inner pipe preferably have an axial length which is less than their diameter.
  • the pipe sections of the inner pipe are preferably connected together by means of upsetting, to form a joint of ball- and-socket type.
  • the casing preferably consists of a curable material and is deformable prior to curing. It may comprise at least one layer produced from a strip material wound helically with partial overlap, e.g. metal strip material, with a curable adhesive between the turns in the overlap region.
  • the casing may be arranged to be cured by the heat from the exhaust fumes after assembly in a motor vehicle.
  • the curable material may be arranged to be cured by air moisture or the like, in which case the exhaust pipe is provided immediately after manufacture with an air-tight wrapping intended to prevent premature hardening of the curable material.
  • a method of manufacturing an exhaust silencer comprises producing an inner pipe, permeable to gas in radial direc ⁇ tion, and providing it with a casing and possibly with a noise-suppressing material between pipe and casing.
  • the method is characterised substantially in that the pipe is produced by manufacturing perforated, generally cylindrical rings out of strip material, e.g. metal strip material, said rings when considered in axial section having outwardly concave cross section, with cross-sectional legs of diffe ⁇ rent lengths, the rings being placed axially beside each other and being flexibly jointed to each other by the longer flange of one ring being upset over the shorter flange on an adjacent ring.
  • the pipe sections preferably have an axial length which is less than their diameter.
  • the cross-sectional structure of the pipe sections and said upsetting are designed to create a joint of ball-and- socket type. Suitable adjustment of the upset will offer a certain friction in the joint designed to permit deformation of the pipe to the desired shape, the exhaust pipe thus obtaining a suitable shape for its proposed location.
  • the exhaust pipe can thus easily be fitted and subsequently fixed permanently.
  • the exhaust pipe is made curable by means, for instance, of a curable material, so that its final shape is only fixed after the exhaust pipe has been fitted in its place of application. Curing may be arranged in conventional manner by means of heat from the exhaust fumes flowing through the pipe, or by means of moisture in the atmosphere surrounding the fitted exhaust pipe.
  • Figure 1 shows schematically an axial section through the inner pipe in the exhaust pipe according to the invention, at the time of manufacture of this inner pipe
  • Figure 2 shows schematically an axial section through an exhaust pipe according to the invention.
  • the exhaust pipe according to the invention comprises an inner pipe 2, radially permeable to gas, a casing 4 surrounding the pipe 2 and a noise-suppressing material 3 arranged between the pipe 2 and the casing 4.
  • the pipe 2 shown in Figure 1 is produced from generally cylindrical rings 10 of metal strip material. Seen in axial section, the rings have an outwardly concave cross section 5, the legs 6, 7 being of different lengths.
  • the end of a new ring with larger diameter is passed over the end with smaller diameter on an adjacent ring, in the direction of the arrow 11.
  • the flange 6 of larger diameter is then shrunk over the smaller flange 7 on the adjacent ring by means of a radially inwardly directed upsetting operation indicated by the arrows 12. Repetition of this process will gradually produce a pipe 2 of desired length.
  • the flanges 6, 7 are dimensioned and shaped to give a joint of ball-and-socket type when subjected to the radial upsetting operation, thus allowing angular adjustment of adjacent rings 10 in relation to each other without sub ⁇ stantially altering their axial distance from each other.
  • the rings 10 are provided with mult- iple perforations 8.
  • the exhaust pipe is produced by possibly providing the prefabricated pipe 2 externally with a noise-suppressing material 3, such as a layer of mineral wool, steel wool or the like, possibly in the form of an unbroken layer, and then applying a casing 4.
  • a noise-suppressing material 3 such as a layer of mineral wool, steel wool or the like, possibly in the form of an unbroken layer
  • the casing 4 comprises a thin metal strip 41 wound helically with overlap 42 between adjacent turns.
  • the strip 41 is provided at least in the overlap region with a curable adhesive 43.
  • the adhesive 43 may be of thermosetting sype. It will then harden, thus solidifying the casing 4 and consequently the whole exhaust system, after the latter has been bent to the desired shape and fitted in the intended position, e.g. on a motor vehicle.
  • a curable adhesive can be used of a type which hardens under the influence of a component from the surrounding athrnos- phere, such as moisture.
  • the exhaust pipe should be provided with an air-tight wrapping immedi ⁇ ately after manufacture, to prevent premature hardening.

Landscapes

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

Abstract

La présente invention se rapporte à un pot d'échappement et à son procédé de fabrication. Le pot d'échappement comprend un tube intérieur, perméable au gaz dans le sens radial et pourvu d'une enveloppe (4) et éventuellement d'un matériau anti-bruit (3) tel que de la laine minérale, placé à l'intérieur de l'enveloppe. On produit le tube (2) en utilisant des anneaux de matériau lamellaire préfabriqués perforés et généralement cylindriques. Vus en section axiale, ces anneaux ont une section transversale concave vers l'extérieur (5), avec des ailes de section transversale (6, 7) de longueurs différentes. Les anneaux (10) sont placés axialement côte à côte et sont assemblés flexibles par refoulement de la bride la plus longue (6) de l'un des anneaux (10) sur la bride la plus courte d'un anneau adjacent (10), formant ainsi un joint (1) du type à bille. On peut fabriquer le tube (2) de façon rapide et rationnelle avec un équipement automatique pour lui donner la forme désirée et on peut le couder jusqu'à ce qu'il présente la forme désirée sans en modifier de façon notable la longueur axiale.The present invention relates to an exhaust pipe and to its manufacturing process. The exhaust comprises an inner tube, permeable to gas in the radial direction and provided with a casing (4) and optionally with an anti-noise material (3) such as mineral wool, placed inside of the envelope. The tube (2) is produced using prefabricated perforated and generally cylindrical rings of lamellar material. Seen in axial section, these rings have an outwardly concave cross section (5), with cross-sectional wings (6, 7) of different lengths. The rings (10) are placed axially side by side and are flexible assembled by pushing the longer flange (6) of one of the rings (10) onto the shorter flange of an adjacent ring (10), thus forming a seal (1) of the ball type. The tube (2) can be manufactured quickly and rationally with automatic equipment to give it the desired shape and can be bent until it has the desired shape without significantly changing its axial length.

Description

An exhaust silencer and a method of manufacturing it
The invention relates to an exhaust silencer of the type comprising an inner pipe, permeable to gas in radial di¬ rection, an outer casing and possibly a noise-suppressing material arranged between the pipe and the outer casing, in the form of mineral wool or metal wool such a steel wool or the like.
The invention also relates to a method of manufacturing such an exhaust pipe, particulary the inner pipe therefor.
The known technology is represented by Swedish Patents No. 73 11 076-9 and No. 85 00 785-4 and British Patent No. 1 191 125.
According to the known technology the basic idea is to produce a bendable exhaust silencer, but the previous designs have several drawbacks both as regards manufacture and also as regards forming the exhaust pipe to the desired shape to fit a particular model of vehicle.
It should be mentioned at this stage that although the exhaust pipe is particulary suitable for use in motor vehicles, other applications are perfectly feasible, e.g. ventilation systems or other fluid channel systems.
One object of the invention is to provide a new exhaust silencer and a new method of manufacturing it, and also to offer a method for quickly and easily manufacturing an exhaust pipe which as well as being bendable to the desired shape, is also able to substantially maintain its axial length when bent, and even maintain its cross section. Further aims and advantages of the invention are revealed in the following description or will be obvious to one skilled in the art who studies the description. According to the invention, therefore, an exhaust silencer is proposed of the type comprising an inner pipe, permeable to gas in radial direction, an outer casing and possibly a noise-suppressing material arranged between pipe and casing, and according to the invention the exhaust pipe is charac¬ terised in that the inner pipe is formed from perforated rings of strip material, joined together axially, said rings when considered in axial section having outwardly concave cross section, with cross-sectional legs of diffe- rent lengths, the rings being flexibly jointed to each other, the longer flange of one ring being upset over the shorter flange of an adjacent ring. The pipe sections of the inner pipe preferably have an axial length which is less than their diameter.
The pipe sections of the inner pipe are preferably connected together by means of upsetting, to form a joint of ball- and-socket type.
The casing preferably consists of a curable material and is deformable prior to curing. It may comprise at least one layer produced from a strip material wound helically with partial overlap, e.g. metal strip material, with a curable adhesive between the turns in the overlap region. The casing may be arranged to be cured by the heat from the exhaust fumes after assembly in a motor vehicle. Alternatively the curable material may be arranged to be cured by air moisture or the like, in which case the exhaust pipe is provided immediately after manufacture with an air-tight wrapping intended to prevent premature hardening of the curable material.
A method of manufacturing an exhaust silencer comprises producing an inner pipe, permeable to gas in radial direc¬ tion, and providing it with a casing and possibly with a noise-suppressing material between pipe and casing. The method is characterised substantially in that the pipe is produced by manufacturing perforated, generally cylindrical rings out of strip material, e.g. metal strip material, said rings when considered in axial section having outwardly concave cross section, with cross-sectional legs of diffe¬ rent lengths, the rings being placed axially beside each other and being flexibly jointed to each other by the longer flange of one ring being upset over the shorter flange on an adjacent ring. The pipe sections preferably have an axial length which is less than their diameter.
The cross-sectional structure of the pipe sections and said upsetting are designed to create a joint of ball-and- socket type. Suitable adjustment of the upset will offer a certain friction in the joint designed to permit deformation of the pipe to the desired shape, the exhaust pipe thus obtaining a suitable shape for its proposed location. The exhaust pipe can thus easily be fitted and subsequently fixed permanently. According to a preferred embodiment, the exhaust pipe is made curable by means, for instance, of a curable material, so that its final shape is only fixed after the exhaust pipe has been fitted in its place of application. Curing may be arranged in conventional manner by means of heat from the exhaust fumes flowing through the pipe, or by means of moisture in the atmosphere surrounding the fitted exhaust pipe.
The invention will be described by way of example with reference to the accompaying drawing illustrating an embo¬ diment shown only schematically.
Figure 1 shows schematically an axial section through the inner pipe in the exhaust pipe according to the invention, at the time of manufacture of this inner pipe, and Figure 2 shows schematically an axial section through an exhaust pipe according to the invention.
Referring first to Figure 2, it can be seen that the exhaust pipe according to the invention comprises an inner pipe 2, radially permeable to gas, a casing 4 surrounding the pipe 2 and a noise-suppressing material 3 arranged between the pipe 2 and the casing 4.
The pipe 2 shown in Figure 1 is produced from generally cylindrical rings 10 of metal strip material. Seen in axial section, the rings have an outwardly concave cross section 5, the legs 6, 7 being of different lengths. The end of a new ring with larger diameter is passed over the end with smaller diameter on an adjacent ring, in the direction of the arrow 11. The flange 6 of larger diameter is then shrunk over the smaller flange 7 on the adjacent ring by means of a radially inwardly directed upsetting operation indicated by the arrows 12. Repetition of this process will gradually produce a pipe 2 of desired length. The flanges 6, 7 are dimensioned and shaped to give a joint of ball-and-socket type when subjected to the radial upsetting operation, thus allowing angular adjustment of adjacent rings 10 in relation to each other without sub¬ stantially altering their axial distance from each other. As shown in Figure 1, the rings 10 are provided with mult- iple perforations 8.
Referring again to Figure 2, the exhaust pipe is produced by possibly providing the prefabricated pipe 2 externally with a noise-suppressing material 3, such as a layer of mineral wool, steel wool or the like, possibly in the form of an unbroken layer, and then applying a casing 4. In the example shown the casing 4 comprises a thin metal strip 41 wound helically with overlap 42 between adjacent turns. The strip 41 is provided at least in the overlap region with a curable adhesive 43. The adhesive 43 may be of thermosetting sype. It will then harden, thus solidifying the casing 4 and consequently the whole exhaust system, after the latter has been bent to the desired shape and fitted in the intended position, e.g. on a motor vehicle.
If the exhaust pipe is to be used where it will not be subjected to sufficient heat to cure suitable adhesives, a curable adhesive can be used of a type which hardens under the influence of a component from the surrounding athrnos- phere, such as moisture. However, in this case the exhaust pipe should be provided with an air-tight wrapping immedi¬ ately after manufacture, to prevent premature hardening.

Claims

C l a i m s
1. An exhaust silencer comprising an inner pipe (2), permeable to gas in radial direction, an outer casing (4) and possibly a noise-suppressing material (3) between the pipe (2) and the outer casing (4), w h e r e i n the inner pipe is formed from perforated rings (10) of strip material, joined together axially, said rings when consi¬ dered in axial section having outwardly concave cross section (5), with cross-sectional legs (6, 7) of different lengths, the rings (10)' being flexibly jointed to each other, the longer flange (6) of one ring being upset (12) over the shorter flange (7) of an adjacent ring (10).
2. An exhaust pipe as claimed in claim 1, w h e r e i n the axial dimension of the rings (10) is less than their inner diameter.
3. An exhaust pipe as claimed in claim 1 or 2, h e r e i n the cross-sectional profile and joint upsets of the rings are arranged to form a joint between them of ball-and-socket type.
4. An exhaust pipe as claimed in claims 1 - 3, h e r e i n the casing (4) consists of a curable material (43) and is deformable prior to curing.
5. An exhaust pipe as claimed in claim 4, w h e r e i n the casing (4) comprises at least one layer produced from a strip material (1) wound helically with partial overlap (42), with a curable adhesive (43) between the turns in the overlap region.
6. An exhaust pipe as claimed in claim 4 or 5, e r e i n the casing is arranged to be cured by the heat from the exhaust fumes passing through the exhaust pipe.
7. A method for manufacturing an exhaust silencer in which an inner pipe (2), permeable to gas in radial direc¬ tion is provided with a casing (4) and possibly with a noise-suppressing material between the pipe (2) and casing (4), w h e r e i n the pipe (2) is produced by manufac- turing perforated, generally cylindrical rings (10) out of strip material, said rings when considered in axial section having outwardly concave cross section (5), with cross- sectional legs (6, 7) of different lengths, the rings (10) being placed axially beside each other and being flexibly jointed to each other by the longer flange (6). of one ring (10) being upset over the shorter flange on an adjacent ring (10).
8. A method as claimed in claim 7, w h e r e i n the rings are shaped and upset to form a joint (1) of ball- and-socket type.
9. A method as claimed in claim 7 or 8, w h e r e i n the casing is produced from a strip-shaped material (41) wound helically and with partial overlap (42), and a curable material (43) is arranged in the overlap region, the adhe- sive being allowed to harden to stabilize the exhaust pipe once it has been given the desired shape.
EP89907334A 1988-06-15 1989-06-01 An exhaust pipe and a method for manufacturing it Withdrawn EP0426696A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8802235 1988-06-15
SE8802235A SE461418B (en) 1988-06-15 1988-06-15 SOUND-EMERGENCY EXHAUST PIPE AND PROCEDURES FOR PREPARING THEREOF

Publications (1)

Publication Number Publication Date
EP0426696A1 true EP0426696A1 (en) 1991-05-15

Family

ID=20372623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89907334A Withdrawn EP0426696A1 (en) 1988-06-15 1989-06-01 An exhaust pipe and a method for manufacturing it

Country Status (18)

Country Link
EP (1) EP0426696A1 (en)
JP (1) JP2598144B2 (en)
CN (1) CN1051410A (en)
AU (1) AU3833789A (en)
BR (1) BR8907489A (en)
DD (1) DD287079A5 (en)
DK (1) DK297990D0 (en)
ES (1) ES2015712A6 (en)
FI (1) FI906134A0 (en)
GR (1) GR890100381A (en)
HU (1) HUT57874A (en)
IL (1) IL90614A0 (en)
NZ (1) NZ229544A (en)
OA (1) OA09585A (en)
PT (1) PT90858A (en)
SE (1) SE461418B (en)
WO (1) WO1989012732A1 (en)
ZA (1) ZA894506B (en)

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Publication number Priority date Publication date Assignee Title
US5705777A (en) * 1995-10-20 1998-01-06 Carrier Corporation Refrigeration compressor muffler
EP0959302A3 (en) * 1998-05-20 2000-02-23 Eberhard Reitz Fluegas exhaust duct silencer
DE10007549A1 (en) * 2000-02-18 2001-09-06 Friedmund Nagel Silencing line for engine exhaust system, consisting of at least one layer of sound absorbing material
CN100412327C (en) * 2003-02-20 2008-08-20 吴溢隆 Method for manufacturing silencer
CN102979986A (en) * 2012-11-25 2013-03-20 蚌埠新奥燃气有限公司 Muffling and antistaticAntistatic exhaust nozzle capable of muffling
CN103470511B (en) * 2013-09-30 2016-10-05 云南大红山管道有限公司 A kind of muffler device of Roots blower air exhaust port and manufacturing method of muffler device and preparation method thereof
CN111963787B (en) * 2020-08-19 2022-03-29 湖南协成管业科技有限公司 Water pipe with noise reduction function

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DE2419994C3 (en) * 1974-04-25 1979-10-18 Westaflexwerk L. & F. Westerbarkey, 4830 Guetersloh Vibration-absorbing pipe section
DE2508984C3 (en) * 1975-03-01 1979-10-11 Metallschlauch-Fabrik Pforzheim (Vorm. Hch. Witzenmann) Gmbh, 7530 Pforzheim Exhaust pipe for internal combustion engines
CH632824A5 (en) * 1978-08-31 1982-10-29 Sulzer Ag THERMAL INSULATION FOR PIPES AND METHOD FOR PRODUCING SUCH ISOLATION.
DE3334413A1 (en) * 1982-09-24 1984-03-29 Witzenmann GmbH, Metallschlauch-Fabrik Pforzheim, 7530 Pforzheim Exhaust manifold for multi-cylinder motor-vehicle engines
DE3447270A1 (en) * 1984-12-22 1986-07-10 Witzenmann GmbH, Metallschlauch-Fabrik Pforzheim, 7530 Pforzheim METAL HOSE IN THE FORM OF A CORRUGATED HOSE OR WINDING HOSE WITH SCREW-SHAPED WAVE OR WAVE. WINDING

Non-Patent Citations (1)

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Title
See references of WO8912732A1 *

Also Published As

Publication number Publication date
SE461418B (en) 1990-02-12
OA09585A (en) 1993-04-30
JPH03505113A (en) 1991-11-07
BR8907489A (en) 1991-05-28
CN1051410A (en) 1991-05-15
DK297990A (en) 1990-12-14
HUT57874A (en) 1991-12-30
DK297990D0 (en) 1990-12-14
SE8802235D0 (en) 1988-06-15
ES2015712A6 (en) 1990-09-01
SE8802235L (en) 1989-12-16
FI906134A0 (en) 1990-12-13
IL90614A0 (en) 1990-01-18
JP2598144B2 (en) 1997-04-09
AU3833789A (en) 1990-01-12
NZ229544A (en) 1992-03-26
GR890100381A (en) 1990-05-11
WO1989012732A1 (en) 1989-12-28
DD287079A5 (en) 1991-02-14
HU893883D0 (en) 1991-11-28
PT90858A (en) 1989-12-29
ZA894506B (en) 1990-03-28

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