WO2002103172A1 - Convertisseur fortement isole a corps court - Google Patents

Convertisseur fortement isole a corps court Download PDF

Info

Publication number
WO2002103172A1
WO2002103172A1 PCT/US2002/021879 US0221879W WO02103172A1 WO 2002103172 A1 WO2002103172 A1 WO 2002103172A1 US 0221879 W US0221879 W US 0221879W WO 02103172 A1 WO02103172 A1 WO 02103172A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating layer
catalyst substrate
wall
short shell
shell
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.)
Ceased
Application number
PCT/US2002/021879
Other languages
English (en)
Inventor
Stephen Joe Myers
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of WO2002103172A1 publication Critical patent/WO2002103172A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features having thermal insulation
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • F01N3/2864—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets comprising two or more insulation layers

Definitions

  • the present invention relates to exhaust converters and more particularly relates to a short shell highly insulated catalytic converter.
  • the shell comprises a generally tubular body portion having an inlet end and an outlet end.
  • the body portion tapers at the inlet and outlet ends to form cone-shaped front and back portions or, alternately, discrete cone pieces are disposed on each end of the tubular body.
  • the converging end of the end cone is tailored to connect with a pipe (or "snorkel tube") for feeding exhaust to the exhaust gas inlet or leading treated gas away from the outlet to the tailpipe.
  • a catalyst substrate is wrapped with an insulating, supporting mat and the wrapped substrate is disposed (that is, stuffed) into the converter body.
  • FIG. 1 a prior art catalytic converter 10 is shown (having a catalytic converter 100 in accordance with the present invention superimposed upon the prior art converter 10 for ready comparison).
  • the prior art catalytic converter 10 comprises a shell 12 having shell length 14.
  • a pair of truncated end cones 16 having squared shoulders 18 are disposed at the inlet and outlet ends of the shell 12.
  • the prior art catalytic converter 10 is highly insulated and has a large packing space.
  • An insulating material (not shown) is. disposed within the shell 12 cavity along substantially all of the shell length 14.
  • the truncated end cones 16 maintain the overall length of the converter.
  • such a design disadvantageously results in weaker cones.
  • Alternate methods for maintaining desired converter length while meeting surface temperature requirements include using external heat shielding or smaller catalysts. It is known to use a mat annulus of 8 millimeters or less and shells that are the length of the combined catalyst lengths (i.e. , length of the single or dual bed catalyst) or greater.
  • What is needed in the art is an improved catalytic converter and method for preparing the same. What is further needed in the art is a catalytic converter providing maximum insulation for enhanced temperature control while at the same time minimizing the packaging space required. What is further needed in the art is a catalytic converter meeting surface temperature requirements without requiring a significant increase in overall converter length or resulting in a reduction in end cone strength.
  • the present invention provides a short shell highly insulated catalytic converter.
  • the converter comprises a short shell forming a generally tubular body for housing a catalyst substrate.
  • the short shell has a length that is less than the length of the catalyst substrate.
  • An end cone is disposed on each end of the body, the end cone having a wide-open end and a narrow open end.
  • the end cone comprises a pair of inner walls forming a first opening at the wide-open end for engaging the catalyst substrate.
  • the end cone further comprises a pair of outer walls extending beyond the pair of inner walls to form a second wider opening at the wide-open end for engaging the short shell.
  • the inner walls and outer walls converge at the narrow open end to form a snout.
  • a full-length insulating layer is disposed adjacent the catalyst substrate and is selected based upon the amount of overlap of the end cone and the catalyst substrate.
  • the full-length insulating is generally substantially coextensive with the catalyst substrate.
  • a partial length insulating layer is disposed between the inner full-length insulating layer and the short shell, the partial length insulating layer being generally co-extensive with the short shell.
  • the present highly insulated short shell catalytic converter provides maximum insulation while minimizing packaging space.
  • the present short shell highly insulated catalytic converter keeps the overall length of the unit down and the strength up.
  • the present catalytic converter provides a much shorter package with stronger end cones that are robust to axial and bending stresses.
  • the present catalytic converter package is about 26 millimeters shorter (for an about 3.4 inch catalyst length, 3 inch diameter) than currently available converters with equivalent end cone strength.
  • the present catalytic converter provides lower skin temperatures, higher bending moment and lower material (steel) cost than similar converters of the same length using traditional stuffed canning designs.
  • FIG. 1 is a side view of a short shell highly insulated catalytic converter in accordance with the present invention superimposed upon a highly insulated truncated end cone prior art catalytic converter.
  • FIG. 2 is a side view in partial cross-section of the short shell highly insulated catalytic converter of the present invention shown in FIG. 1.
  • FIG. 1 provides a view of a prior art catalytic converter 10 having superimposed thereon a view of one possible embodiment of a highly insulated short shell catalytic converter 100 in accordance with the present invention.
  • the prior art converter 10 is described in the Background above using reference numerals in the 10 series.
  • An embodiment of the present invention is now described using 100 series numerals.
  • Highly insulated short shell catalytic converter 100 has a body portion comprising a short shell 112 having shell length 114.
  • Non-truncated end cones 116 having rounded shoulders 118 are disposed at the inlet and outlet ends of the short shell 112.
  • the short shell highly insulated catalytic converter 100 has full-length inner insulating layer 120 and partial length outer insulating layer 122.
  • the full- length insulating layer 120 is provided for the approximate length 125 of the catalyst 126. This allows for protection of the catalyst 126 during in-process handling.
  • the full-length insulating layer 120 disposed adjacent the catalyst substrate 126 is tailored based upon the amount of overlap of the end cone 116 and the catalyst substrate 126, the full-length insulating layer 120 being generally substantially co-extensive with the catalyst substrate 126.
  • the partial length outer insulation 122 is a shortened layer that is less than the length of the full-length layer 120. Partial length layer 122 is configured so as to be substantially co-extensive with the shortened shell 112. The length 124 of the short shell 112 may be tailored as desired provided the end cones are configured to maintain the required strength and formability. For example, in the embodiment shown in FIG. 2, the short shell 112 and the partial length outer insulating layer 122 each have a length 124 of about 60.2 millimeters. In this embodiment, the full-length insulating layer 120 has a length 125 of about 78.8 millimeters and the catalyst substrate 126 has a length of about 86.4 millimeters.
  • Non-truncated end cones 116 have inner walls 128 and outer walls 130, forming a wide-open end 132a, 132b and converging to a more narrow open end 134.
  • Inner walls 128 form a first opening at the wider end 132a for engaging the catalyst substrate 126.
  • Outer walls 130 extend beyond the inner walls 128 to form a wider opening at the wide-open end 132b for engaging the short shell 112.
  • Inner walls 128 and outer walls 130 converge at the narrow open end 134 to form a snout 136 for engaging a pipe, such as an exhaust pipe.
  • end cone insulation 138 is disposed within the gap
  • the present short shell catalytic converter 100 may be prepared by stuffing the catalyst 126 by known processes into the short shell 112 through a stuffing cone.
  • An alternate method comprises stuffing the catalyst 126 into an oversized shell, which requires very little force.
  • the oversized shell is then sized down onto the insulated catalyst.
  • this process is less disruptive to the alignment of the two layers of mat support (i.e., full-length insulating layer 120 and partial length insulating layer 122).
  • a cold bending analysis of a prior art catalytic converter 10 and a short shell catalytic converter 100 prepared in accordance with the present invention was performed using finite element analysis and the commercially available ABAQUSTM modeling software. Both prior art and invention examples comprised 20 node brick model converters prepared from 409 stainless steel.
  • the short shell catalytic converter prepared in accordance with the present invention advantageously provides a much lower Von Mises stress response as compared with the prior art shortened end cone catalytic converter (187 MPa for the invention versus 320 MPa for the prior art converter).
  • the converter of the present invention provided a maximum cyclic bending moment of 101 ft. -lb. compared with only 59 ft. -lb. for the prior art converter.
  • the present highly insulated short shell catalytic converter provides maximum insulation for enhanced temperature control while at the same time minimizing the packaging space required.
  • the present highly insulated short shell catalytic converter further meets surface temperature requirements without requiring a significant increase in overall converter length or resulting in a reduction in end cone strength.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Un convertisseur fortement isolé (100) comprend un corps court (112) qui forme un corps tubulaire prévu pour loger un substrat (126) de catalyseur. Des cônes terminaux (116) présentent une extrémité grande ouverte et une extrémité faiblement ouverte (134) comportant une paroi intérieure (128) qui forme une première ouverture au niveau de l'extrémité grande ouverte (132A) permettant de bloquer le substrat (126) de catalyseur et une paroi extérieure (130) qui s'étend au-delà de la paroi intérieure (128) pour former une deuxième ouverture plus large au niveau de l'extrémité grande ouverte (132B) servant à bloquer le corps court (112). Les parois intérieure et extérieure (128, 130) convergent au niveau de l'extrémité faiblement ouverte pour former un nez (136). Une couche d'isolation (120) s'étendant sur toute la longueur est située adjacente au substrat (126) de catalyseur et une couche d'isolation (122) s'étendant sur une partie de la longueur est située entre la couche d'isolation (120) entière et le corps court (112). Le convertisseur catalytique (100) fortement isolé comprend un corps raccourci (112) et des couches isolantes façonnées sur mesure (120, 12) formant un boîtier plus court pourvu de cônes d'extrémité plus solides qui résistent aux contraintes axiales et de flexion.
PCT/US2002/021879 2001-02-09 2002-02-06 Convertisseur fortement isole a corps court Ceased WO2002103172A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/780,578 US20020141907A1 (en) 2001-02-09 2001-02-09 Short shell highly insulated converter
US09/780,578 2001-02-09

Publications (1)

Publication Number Publication Date
WO2002103172A1 true WO2002103172A1 (fr) 2002-12-27

Family

ID=25119979

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/021879 Ceased WO2002103172A1 (fr) 2001-02-09 2002-02-06 Convertisseur fortement isole a corps court

Country Status (2)

Country Link
US (1) US20020141907A1 (fr)
WO (1) WO2002103172A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6732432B2 (en) * 2001-11-30 2004-05-11 Delphi Technologies, Inc. Apparatus and method for forming an exhaust emission control device, and the device formed thereby
US7332137B2 (en) * 2003-03-24 2008-02-19 Delphi Technologies, Inc. End cone assembly, exhaust emission control device and method of making thereof
US20060242951A1 (en) * 2005-04-29 2006-11-02 Caterpillar Inc. Refractory material retention device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142864A (en) * 1977-05-31 1979-03-06 Engelhard Minerals & Chemicals Corporation Catalytic apparatus
US5250269A (en) * 1992-05-21 1993-10-05 Minnesota Mining And Manufacturing Company Catalytic converter having a metallic monolith mounted by a heat-insulating mat of refractory ceramic fibers
US5666805A (en) * 1994-03-10 1997-09-16 Bayerische Motoren Werke Aktiengesellschaft Emission control system for internal-combustion engines
US5693295A (en) * 1996-01-16 1997-12-02 General Motors Corporation Catalytic converter
US6158120A (en) * 1998-12-14 2000-12-12 General Motors Corporation Method for making a catalytic converter containing a multiple layer mat

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142864A (en) * 1977-05-31 1979-03-06 Engelhard Minerals & Chemicals Corporation Catalytic apparatus
US5250269A (en) * 1992-05-21 1993-10-05 Minnesota Mining And Manufacturing Company Catalytic converter having a metallic monolith mounted by a heat-insulating mat of refractory ceramic fibers
US5666805A (en) * 1994-03-10 1997-09-16 Bayerische Motoren Werke Aktiengesellschaft Emission control system for internal-combustion engines
US5693295A (en) * 1996-01-16 1997-12-02 General Motors Corporation Catalytic converter
US6158120A (en) * 1998-12-14 2000-12-12 General Motors Corporation Method for making a catalytic converter containing a multiple layer mat

Also Published As

Publication number Publication date
US20020141907A1 (en) 2002-10-03

Similar Documents

Publication Publication Date Title
US6568078B2 (en) Method of assembling a catalytic converter for use in an internal combustion engine
JP4596581B2 (ja) 排ガス誘導要素およびその製造方法
CN101473118B (zh) 绝缘双壁排气系统部件及其制造方法
US6491878B1 (en) Catalytic converter for use in an internal combustion engine
US6299843B1 (en) Catalytic converter for use in an internal combustion engine and a method of making
JPH0379531B2 (fr)
US8356639B2 (en) Insulated double-walled exhaust system component and method of making the same
JPH10332055A (ja) 管部材
TW384349B (en) Catalytic converter for a muffler of a small engine
CA2340529A1 (fr) Structure alveolee en ceramique
US6613296B1 (en) Relieved support material for catalytic converter and the process of making the same
WO2002103172A1 (fr) Convertisseur fortement isole a corps court
US20100263762A1 (en) Wire tube structure for exhaust component
CN103168156B (zh) 逐渐减小的切割边缘的垫
US20110041945A1 (en) Automotive Exhaust Pipe
JPH06264740A (ja) エンジン用断熱排気管
CN101688463B (zh) 机动车排气通道
US7047641B2 (en) Exhaust emission control device manufacturing method
EP1336733B1 (fr) Boîtier de convertisseur et procédé de fabrication
FI74522B (fi) Foerfarande foer inkapsling av en katalytcell avsedd foer rening av avgas.
CN104736219A (zh) 在排气后处理或声学装置中安装多层毡、毯或垫的方法
JPS61241413A (ja) 単一体接触転化器取り付け装置
CZ274498A3 (cs) Voštinová struktura pro katalyzátor
US20030091479A1 (en) High temperature resistant material
JP2004167483A (ja) 高温固定床反応器

Legal Events

Date Code Title Description
AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase