WO2011161524A1 - Joint de découplage pour tuyauterie d'échappement de moteurs endothermiques - Google Patents

Joint de découplage pour tuyauterie d'échappement de moteurs endothermiques Download PDF

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Publication number
WO2011161524A1
WO2011161524A1 PCT/IB2011/001416 IB2011001416W WO2011161524A1 WO 2011161524 A1 WO2011161524 A1 WO 2011161524A1 IB 2011001416 W IB2011001416 W IB 2011001416W WO 2011161524 A1 WO2011161524 A1 WO 2011161524A1
Authority
WO
WIPO (PCT)
Prior art keywords
bellows
corrugations
sleeve
free
cylindrical
Prior art date
Application number
PCT/IB2011/001416
Other languages
English (en)
Inventor
Gian Luca Spada
Original Assignee
Flexider S.R.L.
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 Flexider S.R.L. filed Critical Flexider S.R.L.
Publication of WO2011161524A1 publication Critical patent/WO2011161524A1/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
    • 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
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/10—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations
    • F16L27/1004—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations introduced in exhaust pipes for hot gases
    • 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
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/10—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations
    • F16L27/107—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve
    • F16L27/11—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve the sleeve having the form of a bellows with multiple corrugations
    • 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
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/025—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with several corrugations
    • 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
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/03—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube comprising two or more bellows
    • 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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0337—Noise absorbers by means of a flexible connection
    • 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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/041—Devices damping pulsations or vibrations in fluids specially adapted for preventing vibrations

Definitions

  • the present invention relates to a decoupling joint for exhaust pipings of endothermic engines, made in a particularly- simple, inexpensive, and highly efficient way.
  • these decoupling joints are formed by a flexible metal sleeve in the shape of a bellows and fluid tightly constructed, provided in turn with one or more non-fluid tight reinforcing flexible metal sleeves, in particular of a tubular flow-guide element or "liner", disposed concentrically inside the flexible sleeve in the shape of a bellows and made of a metal crimped band, helix coiled to form a tube, and damping elements interposed between the bellows and at least one of the reinforcement sleeves; decoupling joints are, in use, arranged at least along the section of the piping comprised between the engine and the catalytic purifier, in an area, therefore, relatively inaccessible and in which the available space is reduced.
  • the known decoupling joints although relatively efficient, in particular according to EP 0 657 683, have the disadvantage of requiring numerous component elements, which increases the cost of production, bulk and weight.
  • the aim of the invention is therefore to solve these problems by means of a decoupling joint that present reduced dimensions and weight along with a low manufacturing cost and high operation efficiency, both in terms of duration, dampening of vibrations and noise, and does not pose any problem during the welding procedure of the heads.
  • a decoupling joint is thus provided for exhaust pipings of thermic engines as defined in claim 1.
  • the decoupling joint comprises: a first flexible metal sleeve, fluid tightly constructed in the shape of a bellows and, in turn, comprising a plurality of first annular corrugations and a pair of opposed cylindrical terminal ends, free of corrugations; and a pair of opposed heads, each being coaxially and fluid-tightly secured to a respective cylindrical end of the first bellows-like sleeve and intended, in use, to be connected to the exhaust piping.
  • the joint also comprises a second flexible metal sleeve, fluid tightly constructed also in the shape of a bellows, which is arranged within the first sleeve, radially spaced from the first corrugations and with its own respective opposed cylindrical ends free of corrugations radially jointed in contact with the corresponding cylindrical ends of the first bellows-like sleeve .
  • the second bellows-like sleeve has second annular corrugations smaller and larger in number than the first corrugations of the first sleeve, outward radially defining a plurality of ridges and respective depressions alternating between one another.
  • These second corrugations have been axially squeezed at the base, in correspondence to the respective depressions, so as to create towards a symmetry axis of the second bellows, a flow-guiding substantially continuous surface that hydraulically shields the ridges of the second corrugations towards the axis.
  • the second corrugations result substantially closed towards the axis of the second bellows-like sleeve, so that their internal space defined by the internal annular volume of the second bellows-like sleeve enclosed, for each second corrugation, between the ridge of the latter and two depressions which are immediately adjacent from opposite sides of the same ridge, is substantially inaccessible for the exhaust gas flow of the engine which, in use, passes through the joint; apart from a possible leakage between the adjacent edges in contact with each other of opposite radially inner sides of each second corrugation, laterally delimiting on the outside of the second sleeve the depressions adjacent to the corrugation itself, such leakage, however, only representing a negligible fraction of the flow of exhaust gases.
  • the second bellows on one hand absorbs some of the stress to which the joint is subjected, thus making further reinforcement elements unnecessary for the first outer bellows.
  • the second bellows which clearly has its own frequencies different than those of the first bellows, interacts dynamically with the latter, effectively dampening vibrations even in the absence of a conventional dampener element, such as a bearing or padding-sleeve made of wire-mesh (compressed wire mesh pad) .
  • the second corrugations present in the radial direction, a height equal to or less than about half the height, measured in the same radial direction, of the first corrugations, and are present in a number at least double the number of the first corrugations.
  • the first bellows-like sleeve is produced as a double-wall sleeve, while the second bellows sleeve is designed as a single wall sleeve .
  • the axial "squeezing" at the base of the second corrugations which in use prevents most of the exhaust gas through the joint to penetrate into the second corrugations creating turbulence, noise and excessive pressure drops, allows the second sleeve, on the one hand, to effectively exert a flow-guide function, similar to a traditional liner of crimped metal band, although of course its inner surface is not smooth but defined by a sequence of adjacent convexity corresponding to the bottom of each depression present between two adjacent corrugations, and on the other hand, to present a limited flexibility so that it can effectively support the first sleeve.
  • a dampener element consisting of awire mesh sleeve or pad, the area of the heads destined to receive the welding results free of extraneous elements, thus ensuring easy and rapid achievement of high reliable welding beads .
  • FIG. 1 shows a longitudinal view in elevation, partially in radial section of a decoupling joint made according to the invention.
  • Figure 2 shows on an enlarged scale a detail of the construction joint of Figure 1.
  • decoupling joint 1 for exhaust pipes of thermic engines (known and not shown for simplicity) , insertable in use, in a known way, in series along an exhaust piping of an endothermic engine, also known and not shown for simplicity.
  • the decoupling joint 1 is symmetrical with respect to a longitudinal axis A, and comprises a first flexible metal sleeve 2, fluid-tightly constructed in the shape of a bellows and a pair of opposed heads 3, 4 intended in use to be connected in a known way, by welding, to the exhaust piping.
  • the bellows sleeve or just bellow 2 in turn comprises a plurality of first annular corrugations 5 and a pair of opposed cylindrical terminal ends 9, 10, free of corrugations, coaxially bound and fluid-tightly constructed, each at a respective head, 3 and 4 respectively.
  • the joint 1 also comprises, instead of a traditional metal crimped band liner, a second flexible metal sleeve 12, fluid tightly constructed, being also in the shape of a bellows, indicated below for simplicity also only as “bellows 12", which is arranged within the first bellows-like sleeve 2 or, simply bellow 2, radially spaced from the first corrugations 5 and with its own respective opposed cylindrical ends 13, 14 free of corrugations radially jointed in contact with the corresponding cylindrical ends 9, 10 of the bellows 2.
  • a second flexible metal sleeve 12 fluid tightly constructed, being also in the shape of a bellows, indicated below for simplicity also only as “bellows 12", which is arranged within the first bellows-like sleeve 2 or, simply bellow 2, radially spaced from the first corrugations 5 and with its own respective opposed cylindrical ends 13, 14 free of corrugations radially jointed in contact with the corresponding cylindrical ends 9, 10 of the bellows 2.
  • the second bellows-like sleeve 12 has second annular corrugations 15 smaller and larger in number than the corrugations 5, defining radially outwardly the sleeve 12 and, therefore, towards the bellows 5 a plurality of ridges 16 and respective depressions 20 alternating between one another.
  • the second corrugations 15 in contrast with the corrugations 5, which present a profile in radial section, generally omega- shaped and define respective annular loops open both towards the outside of the bellows 2, and towards the axis A, with respect to which the bellows 2 is symmetrical, the second corrugations 15 also have a profile in radial section, generally omega-shaped, but have been axially squeezed at the base, in correspondence to the respective depressions 20, so as to create towards a symmetry axis A which is also the symmetry axis of the second bellows 12, a flow-guide substantially continuous surface 21 that hydraulically shields the ridges 16 towards the axis A.
  • the second corrugations 15 are substantially closed towards the axis of the second bellows-like sleeve 12, so that their interior space, defined by the enclosed annular volume inside the bellows 12, for each corrugations 15, between the crest 16 of the latter and two depressions 20 immediately adjacent to opposite sides of the ridge 16, is substantially inaccessible to the flow F of exhaust gases from the engine that, in use, passes through the joint 1, schematically indicated with an arrow in Figures 1 and 2.
  • the only part of the exhaust gas that can eventually reach the interior of the ridges 16 is represented by the possible leakage between adjacent respective edges 22 and in reciprocal contact of the opposite radially interior sides of each corrugation 15, laterally delimitating on the outside of the sleeve 12 the depressions 20 adjacent to the corrugation 15 itself; in fact, the squeezing effect by the corrugations 15 at their base, so as to bring in reciprocate contact the opposed terminal edges 22 of the same, is anyway not such as to ensure the complete fluid-tightness; it has been experimentally found, however, that such leaks represent only a negligible fraction of the flow F of exhaust gases, therefore the shielding defined by the surface 21 formed by the adjacent edges 22 of the various corrugations 15 and by segments of the bottom wall of the depressions 20 defined between the ridges 16 is effective and allows the surface 21 to form an effective flow-guiding element for the flow F.
  • the corrugations 15 have, in the radial direction, a height equal to or less than about half the height, measured in the same radial direction, of the corrugations 5, and are present in a number at least double the number of the corrugations 5.
  • the thickness, measured in the radial direction, of the side wall of the bellows-like sleeve 2 is approximately twice that of the side wall of the second bellows-like sleeve 12.
  • the bellows-like sleeve 2 is made, in a known way, as a double-wall sleeve, defined by concentrically coupling in close contact the two sleeves 32 and 42 ( Figure 2), each having a single side wall, through the plastic deformation by which the corrugations 5 were formed; however, the bellows- like sleeve 15 is made, as known, as a single wall sleeve. Therefore, the sleeves 32 and 42 defining the bellows 2 and the sleeve defining the bellows 12 have substantially the same radial thickness.
  • the heads 3 and 4 each comprises, an annular element 50, radially arranged on the outside with respect to the bellows-like sleeve 2 and mechanically coupled in contact with a respective cylindrical end free of corrugations 9 and 10, respectively, which is radially sandwiched between the corresponding annular element 50 and the corresponding cylindrical end 13, 14 free of corrugations of the second bellows-like sleeve 15.
  • each cylindrical end 9, 10 free of corrugations of the first bellows-like sleeve 2 has a cylindrical portion 60 of larger diameter from the part facing the corrugations 5, against which a respective flanged end 61 of the annular element 50 of the head 3 or 4 axially abuts, and within which at least one, not fully closed terminal corrugation 15b of the second sleeve element 15 extends.

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

L'invention concerne un joint de découplage (1) comprenant : une première chemise métallique flexible (2), construite sous la forme d'un soufflet étanche aux fluides, présentant une pluralité de premières ondulations annulaires (5) et une paire d'extrémités terminales cylindriques opposées (9, 10) exemptes d'ondulations et des têtes opposées (3, 4), chacune étant fixée de façon coaxiale et étanche aux fluides à une extrémité cylindrique (9, 10) du premier soufflet (2) ; une seconde chemise métallique flexible, construite de manière étanche aux fluides sous la forme d'un soufflet (12), agencée à l'intérieur de la première, radialement espacée des premières ondulations (5), ses extrémités cylindriques opposées respectives (13, 14) exemptes d'ondulations étant radialement accouplées en contact avec les extrémités cylindriques (9, 10) du premier soufflet (2) ; le second soufflet (12) comprenant des secondes ondulations annulaires (15) qui sont plus petites et plus nombreuses que les premières, pressées axialement au niveau de la base, en correspondance avec leurs évidements respectifs (20) directement radialement en direction de l'extérieur pour créer en direction d'un axe de symétrie (A) du second soufflet (12) une surface de guidage d'écoulement sensiblement continue (21) qui assure une protection hydraulique en direction de l'axe des arêtes (16) des secondes ondulations (15).
PCT/IB2011/001416 2010-06-21 2011-06-21 Joint de découplage pour tuyauterie d'échappement de moteurs endothermiques WO2011161524A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2010A000533A IT1400861B1 (it) 2010-06-21 2010-06-21 Giunto di disaccoppiamento per tubazioni di scarico di motori endotermici.
ITTO2010A000533 2010-06-21

Publications (1)

Publication Number Publication Date
WO2011161524A1 true WO2011161524A1 (fr) 2011-12-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/001416 WO2011161524A1 (fr) 2010-06-21 2011-06-21 Joint de découplage pour tuyauterie d'échappement de moteurs endothermiques

Country Status (2)

Country Link
IT (1) IT1400861B1 (fr)
WO (1) WO2011161524A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2730765A1 (fr) * 2012-11-13 2014-05-14 Witzenmann GmbH Elément de conduite flexible
CN103883832A (zh) * 2014-03-14 2014-06-25 江苏曙光压力容器有限公司 平衡型地埋式补偿器
JP2014202260A (ja) * 2013-04-03 2014-10-27 新日鉄住金エンジニアリング株式会社 伸縮継手

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345430A (en) * 1979-11-15 1982-08-24 Manville Service Corporation Automotive catalytic converter exhaust system
JPS5842483U (ja) 1981-09-16 1983-03-22 日本ラヂヱーター株式会社 可撓連結管
EP0410089A1 (fr) * 1989-07-26 1991-01-30 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Elément de conduite flexible pour tuyaux d'échappement de moteurs de véhicules à combustion interne
EP0657683A2 (fr) 1993-11-09 1995-06-14 FLEXIDER S.p.A. Joint flexible d'amortissement des vibrations, en particulier pour un tuyau d'échappement de véhicule
JP2004301192A (ja) * 2003-03-28 2004-10-28 Tokai Rubber Ind Ltd 金属製コルゲートパイプ及び金属製コルゲートパイプの製造方法
US20050242577A1 (en) * 2004-05-03 2005-11-03 Mtu Friedrichshafen Gmbh Exhaust gas bellows expansion joint
US6994381B1 (en) 2000-07-20 2006-02-07 Contech Construction Products Inc. Stab joint coupling
US20060081302A1 (en) * 2002-12-26 2006-04-20 Masao Taira Flexible tube
WO2007019551A2 (fr) * 2005-08-08 2007-02-15 Hose Master Inc. Ensemble tuyau gaine et procede

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345430A (en) * 1979-11-15 1982-08-24 Manville Service Corporation Automotive catalytic converter exhaust system
JPS5842483U (ja) 1981-09-16 1983-03-22 日本ラヂヱーター株式会社 可撓連結管
EP0410089A1 (fr) * 1989-07-26 1991-01-30 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Elément de conduite flexible pour tuyaux d'échappement de moteurs de véhicules à combustion interne
EP0657683A2 (fr) 1993-11-09 1995-06-14 FLEXIDER S.p.A. Joint flexible d'amortissement des vibrations, en particulier pour un tuyau d'échappement de véhicule
US6994381B1 (en) 2000-07-20 2006-02-07 Contech Construction Products Inc. Stab joint coupling
US20060081302A1 (en) * 2002-12-26 2006-04-20 Masao Taira Flexible tube
JP2004301192A (ja) * 2003-03-28 2004-10-28 Tokai Rubber Ind Ltd 金属製コルゲートパイプ及び金属製コルゲートパイプの製造方法
US20050242577A1 (en) * 2004-05-03 2005-11-03 Mtu Friedrichshafen Gmbh Exhaust gas bellows expansion joint
WO2007019551A2 (fr) * 2005-08-08 2007-02-15 Hose Master Inc. Ensemble tuyau gaine et procede

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2730765A1 (fr) * 2012-11-13 2014-05-14 Witzenmann GmbH Elément de conduite flexible
JP2014202260A (ja) * 2013-04-03 2014-10-27 新日鉄住金エンジニアリング株式会社 伸縮継手
CN103883832A (zh) * 2014-03-14 2014-06-25 江苏曙光压力容器有限公司 平衡型地埋式补偿器

Also Published As

Publication number Publication date
ITTO20100533A1 (it) 2011-12-22
IT1400861B1 (it) 2013-07-02

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