EP3827161A1 - Dispositif d'isolation thermique a l'echappement de moteur thermique - Google Patents
Dispositif d'isolation thermique a l'echappement de moteur thermiqueInfo
- Publication number
- EP3827161A1 EP3827161A1 EP19742210.8A EP19742210A EP3827161A1 EP 3827161 A1 EP3827161 A1 EP 3827161A1 EP 19742210 A EP19742210 A EP 19742210A EP 3827161 A1 EP3827161 A1 EP 3827161A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exhaust
- manifold
- wall
- chamber
- 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.)
- Withdrawn
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
- F01N13/001—Exhaust gas flow channels or chambers being at least partly formed in the structural parts of the engine or machine
-
- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
- F01N13/102—Other arrangements or adaptations of exhaust conduits of exhaust manifolds 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
- 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
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
Definitions
- the present invention relates to a heat engine or internal combustion of a motor vehicle.
- the present invention relates more particularly to an exhaust circuit of a heat engine.
- the present invention relates more particularly to a collector device
- a motor vehicle powertrain can
- the pollution control device is in a list comprising for example a catalytic converter, a particulate filter, a nitrogen oxide trap.
- Pollutant emissions from combustion engines fitted to motor vehicles are regulated by increasingly stringent standards.
- the pollutants for which the emission thresholds are regulated are, depending on the combustion engine technology considered, carbon monoxide (CO), unburnt hydrocarbons (HC), nitrogen oxides (NOx), and particles.
- CO carbon monoxide
- HC unburnt hydrocarbons
- NOx nitrogen oxides
- an oxidation catalyst allows the treatment of carbon monoxide, unburnt hydrocarbons, and under certain conditions nitrogen oxides; a particulate filter can be used to treat soot particles.
- the multi-cylinder internal combustion engine of the motor vehicle thus comprises a cylinder head of said engine in which exhaust ducts are arranged, each of said ducts has a first end connected to a combustion chamber and a second end opening into a cavity or plenum a exhaust manifold fixed to the cylinder head, said manifold has an outlet duct connected externally to a device for cleaning up exhaust gases from an exhaust line of the vehicle.
- the exhaust devices include conduits
- the manifold comprises at least one outlet duct which is connected to an exhaust line from the vehicle to the tomobile.
- One of the points influencing the temperature of the gases at the level of the pollution control devices is the distance between the combustion chamber and said devices. Indeed, the remoteness of these depollution devices from the engine combustion chambers delays their rise in temperature, especially during the first minutes of engine operation, and reduces their efficiency even though it is during these first minutes of operation of the engine that the greatest amount of pollutants is emitted.
- Cooling the collector lowers the yield engine thermal. In addition, said cooling also considerably reduces the benefits of bringing the manifold and the combustion chambers closer together. Indeed, the cooling of the collector then no longer allows the rapid rise in temperature of the gases suitable for improving the efficiency of the depollution device.
- document FR2902827-A1 proposes a device comprising a manifold fixed to the cylinder head of the engine and provided with thermal decoupling means relative to said cylinder head.
- the manifold comprises a part integrated in the cylinder head, said part is in contact with the cylinder head at different fixing points.
- the insulation is formed by an air knife.
- the attachment of the manifold to the cylinder head is formed by mechanical connections between the manifold and the other parts. These mechanical connections under the effect of the heat of the burnt gases expand, dragging thermal cycling and mechanical stresses.
- the object of the invention is to remedy these problems and one of the objects of the invention is a device for circulating the exhaust gases of a heat engine of a motor vehicle comprising an exhaust manifold fixed to a engine cylinder head, said manifold being partially integrated into the cylinder head, the cavity into which the exhaust pipes of the cylinder head or plenum open out being delimited by a wall hollowed out in the cylinder head and by a wall of the manifold.
- Said collector also includes an outlet conduit connected to the pollution control device.
- the walls delimiting the plenum are heat-insulating walls to preserve the temperature of the gases on the way.
- the present invention relates more particularly to a device for circulating the exhaust gases of a heat engine of a motor vehicle comprising an exhaust manifold comprising at least one outlet duct and fixed to a cylinder head of the engine in which are hollowed out exhaust ducts, each of the ducts connecting at one end a combustion chamber and opening at the other end into an exhaust gas chamber, said chamber being covered by a wall of the manifold, characterized in that the walls of the room are insulated
- the walls of the exhaust gas chamber forming a plenum, into which opens each exhaust duct hollowed out in the cylinder head, are insulated to avoid any heat loss from the gases and make it possible to obtain exhaust gases at their highest possible temperature according to the engine operating regimes when they enter a pollution control system.
- the pollution control device can have optimal efficiency.
- manifold walls will be less affected by the temperature of the gases and therefore the expansions of said collector are contained.
- each cylinder head exhaust duct is insulated in order to avoid any heating of the outlet of each cylinder head exhaust duct which can cause the manifold to heat.
- the upstream end of the manifold outlet duct is insulated.
- the upstream end of the manifold outlet conduit is insulated to prevent overheating of the manifold wall surrounding the exhaust chamber and reduce the differential expansion of the manifold relative to the cylinder head.
- the inner wall of the exhaust chamber is covered by a thermal insulation envelope.
- the exhaust chamber or plenum is delimited by a thermal insulation envelope, which thermal envelope covers the entire exhaust chamber.
- the thermal envelope is therefore contained inside a chamber formed by a wall of the cylinder head and of the exhaust manifold.
- the thermal envelope isolates the exhaust manifold from the burnt gases and allows a reduction in the rise in temperature of said collector and therefore in its expansion.
- the insulation envelope comprises an upstream half-shell attached to a wall of an exhaust cavity of the cylinder head from which each of the exhaust ducts opens.
- the insulation envelope comprises an upstream half-shell according to the direction of flow of the gases, attached to a wall for fixing the cylinder head from which the exhaust ducts open.
- Said half-shell has shapes substantially complementary to the shapes of the cylinder head exhaust wall, said exhaust wall is for example obtained by digging from the cylinder head fixing wall to form a cavity to increase the volume of the exhaust chamber or to optimally reduce the size of the exhaust manifold and to be able to bring a pollution control device closer to the combustion chambers of the engine.
- the upstream half-shell comprises a sleeve by exhaust pipe, each of the sleeves being pressed into the downstream end of the exhaust pipe.
- the upstream half-shell includes sleeves, at least one sleeve per exhaust pipe of the cylinder head which is pressed into the downstream end of said exhaust pipe, which allows on the one hand a maintenance of said half-shell by the cylinder head and on the other hand optimal insulation of the walls forming the exhaust chamber or plenum in order to reduce the temperatures of the wall for fixing the cylinder head and of the manifold fixed to the cylinder head by said wall, in order to reduce the differential expansions of the cylinder head and the manifold.
- the envelope includes a downstream half-shell attached to the wall of the manifold
- the thermal insulation envelope comprises a downstream half-shell attached to the wall of the exhaust manifold, said half-shell being intended for contact with the exhaust gases to reduce on the one hand heating of the manifold wall and secondly the drop in gas temperatures
- the downstream half-shell comprises at least one outlet sleeve pressed into the
- the downstream half-shell comprises at least one outlet sleeve which is pressed into the at least one manifold outlet conduit leading to an engine depollution device.
- Said outlet sleeve allows mechanical retention of the half-shell in the exhaust manifold.
- the manifold outlet conduit includes a stop for receiving a free end of the at least one outlet sleeve.
- G at least one manifold outlet conduit includes a stop capable of receiving a free end of the at least one outlet sleeve to ensure optimal positioning of the half-shell in the wall of the manifold.
- the upstream half-shell and the downstream half-shell are made from the same material and / or from the same part forming the insulation envelope.
- the upstream half-shell and the downstream half-shell are made from the same material and / or from the same part forming the insulation envelope to facilitate obtaining the half-shells and to facilitate the installation of the insulation envelope between the cylinder head and the exhaust manifold.
- the insulation envelope is fixed to the collector.
- the envelope is fixed integral with the collector using for example a strap which surrounds the upstream half-shell to press it against the downstream half-shell in order to maintain the insulation envelope formed by the two half-shells against the wall of the collector with G at least one outlet sleeve pressed into the at least one outlet duct of the collector.
- the insulation envelope is then securely attached to the manifold to facilitate positioning of the assembly against the cylinder head mounting wall.
- the insulation envelope comprises a layer of mineral insulation covered with a thin metal wall.
- the insulation envelope comprises a layer of mineral insulation covered by a thin wall to ensure that the structure of the insulation envelope is kept.
- the thin wall is rigid enough to keep the shape of the envelope, the layer of mineral insulation can then deform to match the wall of the exhaust chamber, namely the wall of the cylinder head and the wall of the manifold .
- the thin metal wall is intended for contact with the exhaust gases.
- the thin metal wall is intended for contact with the exhaust gases, which makes it possible to preserve the shape of the chamber containing the exhaust gases during engine operation and to preserve a layer of isolation from any degradation.
- the insulating layer is pressed against the inner wall of the exhaust chamber.
- the layer of mineral insulation is pressed against the wall of the exhaust chamber, in particular against the walls of the cylinder head exhaust cavity, from the downstream end of each duct d exhaust from the cylinder head, and from the upstream end of the manifold outlet conduit, to allow optimal thermal insulation of the exhaust gas flows as they pass through the exhaust manifold.
- FIG. 1 is a schematic view of the exhaust face of a heat engine with positive pollution control devices.
- FIG. 1 is a schematic view of the exhaust side of the engine with the exhaust manifold.
- FIG. 1 is a schematic view in longitudinal section of the exhaust gas circulation device according to the invention.
- FIG. 1 is a schematic view of the insulation envelope of the circulation device exhaust gas according to the invention.
- upstream / downstream refer to the direction of circulation of the exhaust gases
- a heat engine (not shown) comprises a cylinder head 10 disposed above a cylinder block (not shown).
- cylinders are hollowed out along a substantially vertical axis and orthogonal to a junction plane 11 of the cylinder head on the cylinder block.
- exhaust ducts 12 connecting combustion chambers, each of said chambers is delimited by one of the cylinders, by the connection plane or by a substantially conical roof hollowed out in the cylinder head from the connection plane and facing the cylinder, and by a piston (not shown) movable in sliding along the axis of said cylinder, in a reciprocating movement.
- Each of the exhaust conduits is capable of directing burnt or exhaust gases to an exhaust manifold 14 fixed to the cylinder head against a fixing wall 17 facing the side of a so-called exhaust face 13 of the cylinder head 10
- Each of the exhaust ducts opens from the cylinder head through the fixing wall 15 into an exhaust chamber or plenum, delimited downstream in the direction of circulation of the exhaust gases by a wall of the exhaust manifold 14.
- the burnt gases generated by combustion in the combustion chamber are therefore directed via the exhaust duct to pass through the exhaust manifold 14 and reach a turbine stage 15 and a pollution control device 16 as shown in the Figure 1 defining the direction of circulation of the exhaust gases.
- the gas circulation is represented by the arrows 34 in FIGS. 3 and 4.
- the invention relates to a device 100 for circulating exhaust gases from the combustion chamber to a pollution control device.
- Said device 100 comprises the exhaust ducts 12 hollowed out in the cylinder head, the plenum and the exhaust manifold 14 with the outlet duct connected with the depollution device.
- the fixing wall 17 is hollowed out to form an exhaust cavity 18 of the cylinder head 10, said cavity 18 is covered by the manifold 14, as shown in FIG. 4.
- the manifold 14 covers said exhaust cavity to form an exhaust chamber 40 of the gases or plenum of the exhaust gases.
- the walls of the exhaust chamber 40 are insulated, in fact the walls 19 of said chamber is covered by a thermal insulation envelope 20. Said walls of the chamber are formed by the wall 33 of the cavity
- Said insulating envelope 20 is formed by a first upstream half-shell 21 which is attached to the wall of the exhaust cavity 18 of the cylinder head 10 and a second downstream half-shell 22 which is pressed against the wall 32 of the exhaust manifold 14 inside said manifold.
- Said envelope allows thermal insulation from inside the chamber
- exhaust 40 in order to maintain the temperature of the gases and to avoid thermal losses which improves the efficiency of the downstream pollution control device, and to preserve the walls of the exhaust chamber 40, in particular the wall 19 of the exhaust cavity 18 and of the manifold 14, increases in high temperatures likely to cause differential expansions and stresses in the fasteners of the manifold with the cylinder head.
- the first and second half-shells 21, 22 are formed from the same materials, by a layer of mineral insulator 23 of MAT type of mineral fiber on which a thin metal wall 24 is affixed.
- Said thin metal wall 24 faces the interior of the chamber and is intended for contact with the exhaust gases.
- the metal layer ensures an optimal shape to direct the exhaust gases to the outlet duct.
- the insulating layer can be compressed and the thickness of the metallic thin layer does not have a significant impact on the overall volume of the exhaust chamber, which makes it possible to contain the bulk of the device 100 for circulating gases.
- the mineral fiber can be based on calcium silicate to withstand the temperature levels of the exhaust gases.
- the first upstream half-shell 21 includes inlet sleeves 25 of dimensions substantially complementary to those of the exhaust ducts 12, said inlet sleeves 25 are intended to be inserted into said exhaust ducts 12.
- the upstream half-shell 21 has as many inlet sleeves 25 as the cylinder head has exhaust ducts 12 and more precisely outlets 12f of exhaust ducts 12 in the exhaust cavity 18.
- each cylinder is connected to the exhaust cavity 18 by several, here two, initial conduits l2a, l2b which are then grouped into a single downstream end conduit l2c which opens into the exhaust cavity 18.
- the rest of the description refers to a single exhaust duct 12 per cylinder. According to FIGS.
- the outlet of the exhaust duct 12 in the wall of the exhaust cavity 18 has a flare 18e to receive the inlet sleeve 25.
- the fitting of the inlet sleeve 25 in the exhaust duct 12 and in particular in the flared outlet 18e of said duct 12 allows mechanical maintenance of the upstream half-shell 21 in the exhaust cavity 18 and therefore in the cylinder head 10.
- this arrangement allows optimal thermal insulation of the exhaust chamber 40 or plenum on the one hand to avoid in particular differential latencies of the cylinder head 10 and of the manifold 14 and on the other maintain the temperature of the exhaust gases when the manifold passes.
- the second downstream half-shell 22 includes an outlet sleeve 27 of dimension substantially complementary to the outlet conduit 26 of the manifold 14.
- the exhaust manifold 14 may however have several outlet ducts 26 and it is then possible to have as many outlet sleeves 27 as there are outlet ducts 26 from the manifold.
- Said outlet sleeve 27 is intended to be pressed into said outlet conduit 26 of the manifold 14.
- the fitting of said outlet sleeve 27 in the outlet conduit 26 allows optimal isolation of the wall of the manifold 14 and avoid strong increases in temperature of said manifold 14.
- the outlet conduit 26 of the manifold 14 has a flare 28 intended to receive the outlet sleeve 27.
- Said flare is preferably terminated by a stop 29 to receive a free end of the sleeve outlet 27 in order to ensure the positioning of the second half-shell 22 in the wall of the manifold 14.
- Said stopper 29 may for example be a circular shoulder hollowed out in the wall 32 of the manifold 14.
- the upstream end 26a of the outlet duct 26 of the collector is therefore insulated.
- the first upstream half-shell 21 has an outer groove 30 which is
- the groove 30 allows the winding of a strap to allow the fixing of the first half-shell 21 to the manifold 14.
- the establishment of the two half-shells can include the following steps:
- the circulation device 100 provides thermal insulation of the chamber
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1870858A FR3084109B1 (fr) | 2018-07-23 | 2018-07-23 | Dispositif d’isolation thermique a l’echappement de moteur thermique |
| PCT/EP2019/069688 WO2020020828A1 (fr) | 2018-07-23 | 2019-07-22 | Dispositif d'isolation thermique a l'echappement de moteur thermique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3827161A1 true EP3827161A1 (fr) | 2021-06-02 |
Family
ID=65494416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19742210.8A Withdrawn EP3827161A1 (fr) | 2018-07-23 | 2019-07-22 | Dispositif d'isolation thermique a l'echappement de moteur thermique |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3827161A1 (fr) |
| CN (1) | CN112469892A (fr) |
| FR (1) | FR3084109B1 (fr) |
| WO (1) | WO2020020828A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610321A (zh) * | 2020-12-09 | 2021-04-06 | 一汽解放汽车有限公司 | 一种发动机排气道隔热装置及车辆 |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1322495A (en) * | 1969-07-18 | 1973-07-04 | Ricardo & Co Engineers | Exhaust passages in internal combustion engines |
| JPS51119423A (en) * | 1975-04-11 | 1976-10-20 | Nissan Motor Co Ltd | Exhaust purification device of torch ignition engine |
| AT367169B (de) * | 1979-05-29 | 1982-06-11 | List Hans | Auskleidung des auspuffkanals eines dieselmotors |
| JPS63280813A (ja) * | 1987-05-13 | 1988-11-17 | Isuzu Motors Ltd | 排気マニホ−ルド |
| JPS63280814A (ja) * | 1987-05-13 | 1988-11-17 | Isuzu Motors Ltd | 排気マニホ−ルド |
| DE3720714A1 (de) * | 1987-06-23 | 1989-01-05 | Gruenzweig & Hartmann Montage | Waermedaemmsystem fuer heisse gase fuehrende eingegossene bauteile von brennkraftmaschinen |
| DE3929205A1 (de) * | 1989-09-02 | 1991-03-21 | Leistritz Ag | Abgasvorrichtung, insbes. abgasreinigungsvorrichtung |
| FR2738289B1 (fr) | 1995-08-31 | 1997-10-17 | Renault | Dispositif d'echappement pour moteur a combustion interne |
| JPH08189336A (ja) * | 1995-01-04 | 1996-07-23 | Isuzu Ceramics Kenkyusho:Kk | ディーゼルパティキュレートフィルタを備えた遮熱エンジン |
| JP3555431B2 (ja) * | 1998-02-06 | 2004-08-18 | いすゞ自動車株式会社 | 遮熱形エンジンの構造 |
| JP2003172136A (ja) * | 2001-12-03 | 2003-06-20 | Honda Motor Co Ltd | 内燃機関の排気通路構造 |
| JP4020059B2 (ja) * | 2003-10-10 | 2007-12-12 | 日産自動車株式会社 | 内燃機関の吸気装置 |
| JP3772871B2 (ja) * | 2003-10-10 | 2006-05-10 | 日産自動車株式会社 | 内燃機関の吸気装置 |
| US20070163250A1 (en) * | 2004-03-03 | 2007-07-19 | Sane Ajit Y | Highly insulated exhaust manifold |
| DE102005025731A1 (de) * | 2005-06-04 | 2006-12-07 | Daimlerchrysler Ag | Abgasführung einer Brennkraftmaschine |
| FR2902827B1 (fr) | 2006-06-23 | 2012-09-28 | Renault Sas | Dispositif d'echappement comportant une culasse munie d'un collecteur d'echappement integre decouple thermiquement |
| CN101000004B (zh) * | 2006-12-19 | 2010-08-11 | 奇瑞汽车股份有限公司 | 汽车发动机高压导线隔热保护装置 |
| ES2359307B2 (es) * | 2009-02-13 | 2011-10-14 | Universidad Politécnica De Valencia | Colector de escape de un motor alternativo turbo-sobrealimentado. |
| JP2013057272A (ja) * | 2011-09-07 | 2013-03-28 | Toyota Motor Corp | 内燃機関排気冷却装置 |
| CN202596864U (zh) * | 2012-04-26 | 2012-12-12 | 常州市良久机械制造有限公司 | 节能排气管 |
| DE102013109446B4 (de) * | 2013-08-30 | 2015-11-26 | Benteler Automobiltechnik Gmbh | Abgaskrümmer mit Isolationshülse |
| DE102014203015A1 (de) * | 2014-02-19 | 2015-08-20 | Volkswagen Aktiengesellschaft | Verfahren und Vorrichtung zum Führen eines Abgasstroms eines Verbrennungsmotors mit einem lastabhängigen Wärmeübergangskoeffizienten |
| DE102016201166B3 (de) * | 2016-01-27 | 2017-05-04 | Ford Global Technologies, Llc | Fremdgezündete flüssigkeitsgekühlte Brennkraftmaschine mit gekühltem Zylinderkopf |
| DE102016012719A1 (de) * | 2016-10-25 | 2018-04-26 | Man Truck & Bus Ag | Zylinderkopf mit angeschlossenem Auspuffkrümmer einer Brennkraftmaschine |
-
2018
- 2018-07-23 FR FR1870858A patent/FR3084109B1/fr active Active
-
2019
- 2019-07-22 CN CN201980048548.4A patent/CN112469892A/zh not_active Withdrawn
- 2019-07-22 EP EP19742210.8A patent/EP3827161A1/fr not_active Withdrawn
- 2019-07-22 WO PCT/EP2019/069688 patent/WO2020020828A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020020828A1 (fr) | 2020-01-30 |
| CN112469892A (zh) | 2021-03-09 |
| FR3084109A1 (fr) | 2020-01-24 |
| FR3084109B1 (fr) | 2022-08-19 |
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