DE102018130782A1 - Coupling structure of a pipeline - Google Patents

Abstract

A coupling structure of a pipeline is provided, which makes it possible to suppress the corrosion of a flange by exhaust gas and to reduce the cost of the coupling structure. One aspect of the present disclosure relates to a coupling structure (1) for mounting a pipeline (2). The coupling structure (1) is provided with a flange (3) and a collar (4). The flange (3) can be tightened with a counter flange via a seal and has an opening (3A) and a central area (3B). In the opening (3A), the pipe (2) can be inserted. The central portion (3B) extends radially outwardly from the opening (3A) and descends in the thickness direction of the flange (3). The collar (4) is made of a metal having a higher corrosion resistance than that of a metal constituting the flange (3), and has a tubular portion (4B) and a ring portion (4A). The tubular portion (4B) has a Shape covering the entire circumference of the outer peripheral surface of the pipe (2), and can be connected at a first end to the entire circumference of the outer peripheral surface of the pipe (2). The ring portion (4A) then extends radially outward at a second end of the tubular portion (4B) at least in comparison to the opening of the seal and is connected to the flange (3) in the central area (3B).

Description

The present disclosure relates to a coupling structure of a pipeline.

STATE OF THE ART

A piping forming a flow path of exhaust gas discharged from an internal combustion engine of a vehicle is made of a metal having a high corrosion resistance such as, for. B. stainless steel, etc. formed. This pipeline is also connected via a coupling structure with a flange to another pipeline (see JP 2009-250338 A ).

OVERVIEW

In a coupling structure, when the flange is formed of iron or steel as in the above publication, there is a fear of corrosion of the flange by exhaust gas leaked from a gap at the joint of the piping. However, if the machining is done with no gap at the joint of the piping, productivity is significantly reduced.

On the other hand, if the flange is made of stainless steel, the corrosion can be suppressed. However, since the flange requires a certain thickness, the material cost of the coupling structure must be increased significantly when a stainless steel is used for the flange.

According to one aspect of the present disclosure, it is preferable to provide a coupling structure of a piping which enables the corrosion of the flange by exhaust gas to be suppressed and the cost of the coupling structure to be reduced.

One aspect of the present disclosure relates to a coupling structure for mounting a pipeline that forms a flow path of exhaust gas discharged from an internal combustion engine. The coupling structure is provided with a flange and a collar. The flange can be tightened with a mating flange via a gasket and has an opening and a central area. The pipe can be inserted into the opening. The middle region extends radially outward from the opening and lowers in the thickness direction of the flange. The sleeve is made of a metal having a higher corrosion resistance than that of a metal constituting the flange, and has a tubular portion and a ring portion. The tubular portion has a shape covering the entire circumference of the outer peripheral surface of the pipe, and may be connected at a first end to the entire circumference of the outer peripheral surface of the pipe. The ring portion then extends radially outward at a second end of the tubular portion, at least compared to the opening of the seal, and is connected to the flange in the central region.

According to such a configuration, it is possible to form the flange from inexpensive metal material and suppress the corrosion by covering a part of the flange with which the exhaust gas may be in contact with a sleeve having a high corrosion resistance. The collar, unlike the flange, can easily reduce the thickness. Therefore, it is possible to suppress the corrosion of the flange and to reduce the cost of the coupling structure.

By connecting the collar to the flange can also be suppressed that the flange moves freely during assembly of the coupling structure to a counterpart component. As a result, machinability increases when the flange is tightened. Further, since the surface pressure generated by the flange can be uniformly transferred to the cuff, the sealing performance increases.

According to one aspect of the present disclosure, the piping may also form exhaust gas recirculation. With this configuration, in an exhaust gas recirculation (EGR) in which the temperature change due to intermittently flowing exhaust gas having high humidity and temperature is strong and corrosion due to condensation easily occurs, corrosion of the flange can be effectively suppressed and the cost of the coupling structure can be reduced become.

According to one aspect of the present disclosure, the cuff may further comprise at least one ear portion projecting from the ring portion radially outward of the tubing. At least one ear section, a through hole can also be provided in each case. With this configuration, the positioning of the collar for the flange can be made easily, so that the number of operations can be reduced and the positional accuracy can be increased.

list of figures

• 1 ist eine schematische Erläuterungsansicht eines Abgaskrümmers, für den eine Kupplungsstruktur einer Rohrleitung gemäß der Ausführungsform verwendet;
• 2A ist eine schematische Vorderansicht einer Kupplungsstruktur einer Rohrleitung gemäß der Ausführungsform und 2B ist eine schematische Rückansicht der Kupplungsstruktur der Rohrleitung von 2A;
• 3 ist eine schematische Querschnittsansicht entlang der Linie III-III von 2B; sowie
• 4 ist eine schematische Querschnittsansicht einer Kupplungsstruktur einer Rohrleitung gemäß einer Ausführungsform, die sich von der in 3 unterscheidet.

Hereinafter, an exemplary embodiment of the present disclosure will be described with the drawings.

• 1 FIG. 12 is a schematic explanatory view of an exhaust manifold using a coupling structure of a piping according to the embodiment; FIG.
• 2A is a schematic front view of a coupling structure of a pipeline according to the embodiment and 2 B is a schematic rear view of the coupling structure of the pipeline of 2A ;
• 3 Fig. 12 is a schematic cross-sectional view taken along the line III-III of Fig. 2B; such as
• 4 is a schematic cross-sectional view of a coupling structure of a pipeline according to an embodiment, which differs from the in FIG 3 different.

EMBODIMENTS OF THE INVENTION

First embodiment

training

An in 1 such as 2A . 2 B 1 of a piping is used to connect pipelines forming a flow path of exhaust gas discharged from an internal combustion engine. As in 1 shown is the coupling structure 1 in an exhaust manifold 10 intended. As further in 2A . 2 B shown is the coupling structure 1 with a pipeline 2 , a flange 3 and a cuff 4 Provided.

<Pipeline>

The pipeline 2 forms a flow path of exhaust gas discharged from the engine. The pipeline 2 is made of a metal having a resistance to corrosion due to high-temperature exhaust gas such. B. stainless steel formed.

In the present embodiment, the pipeline forms 2 an EGR, with which a part of the exhaust gas discharged from the internal combustion engine of a vehicle is sucked into the internal combustion engine. Ie. the coupling structure 1 is connected to a coupling of the pipeline, which forms an intake of the internal combustion engine.

<Flange>

The flange 3 is a component at the end of the pipeline 2 is arranged and radially outward of the pipeline 2 protrudes. The flange 3 is designed such that it can be tightened with a counter flange via a seal.

At the flange 3 is an opening 3A formed into the end of the pipeline 2 is inserted. In the present embodiment, the diameter of the opening 3A greater than the outer diameter of the pipeline 2 and between the opening 3A and the pipeline 2 is a later-described tubular portion 4B the cuff 4 in front.

The flange 3 will, as in 3 shown with a counterflange A2 Attracted to the one with the coupling structure 1 connected counter pipeline A1 is provided. The flange 3 It consists of metals with a lower corrosion resistance and costs, such as iron or steel, than a metal that seals the cuff 4 formed.

Regarding the flange 3 lowers a middle range 3B that is at the periphery of the opening 3A is located as in 3 shown on a tightening surface (ie an abutment surface with the mating flange A2 ) to the pipe 2 towards (ie, the side facing away from the attraction surface in the thickness direction of the flange) compared to an end region 3C that compared to the middle range 3B radially outside of the pipeline 2 lies. Ie. the thickness of the flange 3 at the middle area 3B is smaller than the thickness of the flange 3 at the end area 3C ,

In the present embodiment, the end portion is 3C , as in 2 B shown the central axis of the middle area 3B and the pipeline 2 arranged clamped. At the end area 3C of the flange 3 are also several through holes 3D formed for dressing.

Further, in the present embodiment, the flange 3 on the pipeline 2 via a cuff described later 4 attached, whereas the flange 3 not directly with the pipeline 2 connected is. The flange 3 However, by welding, etc. also directly with the pipeline 2 be connected.

<Sleeve>

The cuff 4 is a component that works with both of the tubing 2 and the flange 3 connected is. The cuff 4 consists of a metal with a higher corrosion resistance than that of a metal from which the flange 3 consists. As metal, from which the cuff 4 exists, z. B. lead stainless steel.

The cuff 4 points as in 2A and 2 B shown a ring section 4A a tubular section 4B and two ear cuts 4C on. The ring section 4A , the tubular section 4B and the two ear cuts 4C are formed by machining a single metal plate.

(Ring portion)

As in 3 shown is the ring section 4A designed such that this subsequent to the second end on the side facing away from the first end, with the pipe 2 of the tubular portion 4B is connected, at least compared to the opening of the seal 6 extends radially outward. Specifically, the ring section overlaps 4A the middle area 3B on the tightening surface of the flange 3 , The ring section 4A is how in 2 B shown in the thickness direction of the flange 3 seen the opening 3A of the flange 3 arranged surrounding.

The ring section 4A is with the middle area 3B of the flange 3 welded by projection. In the present embodiment, the ring portion 4A at four welding sections 5 welded by projection.

The four welding sections 5 are provided at positions when tightening the coupling structure 1 not the one between the cuff 4 and the counterflange A2 arranged seal 6 overlap. Under the four welding sections 5 are two weld sections 5 and the remaining two weld sections 5 Almost arranged. The pairs of the two approximately arranged welding sections 5 are in symmetrical position around the center of the pipeline 2 arranged.

In the present embodiment, the four welding sections 5 in the vicinity of the connecting portion between the ear portion described later 4C and ring section 4A arranged. Ie. is the ring section 4A in the vicinity of the ear section 4C with the flange 3 welded.

The number of welding sections 5 is not limited to 4, and at least one welding section 5 can be present. However, from the viewpoint of strength, it is preferable that at least two around the center of the pipeline 2 arranged welding sections 5 are provided.

(Tubular section)

The tubular section 4B has a shape that covers the entire circumference of the outer circumferential surface of the pipeline 2 covers, and is formed such that it at the first end with the entire circumference of the outer peripheral surface of the pipeline 2 can be connected. Specifically, the tubular portion 4B , as in 3 shown at the end of the pipeline 2 inserted from the outside in the axial direction and the inner peripheral surface of the tubular portion 4B with the outer peripheral surface of the pipeline 2 For example, connected by welding.

The tubular section 4B joins the ring section 4A and extends from the inner edge of the ring section 4A in the axial direction of the pipeline 2 , The ring section 4A and the tubular portion 4B are formed by burring a metal plate with an opening.

In the present embodiment, the tubular portion 4B and the pipeline 2 by arc welding along the circumferential direction of the pipeline 2 coupled. The welding process between the tubular section 4B and the pipeline 2 however, is not limited to arc welding.

Further, in the present embodiment, the tubular portion 4B to the flange 3 spaced apart. Ie. between the side, the opening 3A of the flange 3 forms, and the outer peripheral surface of the tubular portion 4B a gap is provided.

(Ear portion)

As in 2 B shown are the two ear sections 4C each from the ring section 4A radially outward of the pipeline 2 in front. Regarding the two ear cuts 4C are also attached to areas that are compared to the flange 3 radially outward of the pipeline 2 protrude, each through holes 4D intended.

In projection welding of the cuff 4 to the flange 3 Pins are each in the two through holes 4D inserted, reducing the positioning of the cuff 4 and the flange 3 can be made easily and safely.

effects

• (1a) Es ist möglich, den Flansch 3 aus einem kostengünstigen Metallmaterial zu bilden und eine Korrosion zu unterdrücken, indem ein Teil des Flansches 3 (also der mittlere Bereich 3B), mit dem das Abgas in Berührung stehen kann, mit der Manschette 4 mit einer hohen Korrosionsbeständigkeit abgedeckt wird. Die Manschette 4 kann im Unterschied zum Flansch die Dicke leicht verkleinern. Es ist daher möglich, die Kosten der Kupplungsstruktur 1 zu reduzieren, während die Korrosion des Flansches 3 unterdrückt wird.
• (1b) Durch Schweißen der Manschette 4 an den Flansch 3 kann unterdrückt werden, dass sich der Flansch 3 bei der Montage der Kupplungsstruktur 1 an das Gegenbauteil frei bewegt. Als Folge erhöht sich die Bearbeitbarkeit bei Anziehen des Flansches 3. Da ferner der durch den Flansch 3 erzeugte Oberflächendruck gleichmäßig auf die Manschette 4 übertragen werden kann, erhöht sich die Dichtungsleistung.
• (1c) Die Manschette 4 wird an ihrem Ringabschnitt 4A durch Projektionsschweißen, dessen Eintrittswärmemenge im Vergleich zum Lichtbogenschweißen klein ist, mit dem Flansch 3 verbunden, so dass es möglich ist, die Verzerrung der Anzugsfläche des Ringabschnitts 4A zu reduzieren und die Ebenheit zu erhöhen. Da ferner durch Anwendung des Projektionsschweißens die Dicke der Manschette 4 verkleinert werden kann, ist es möglich, die Dicke der Manschette 4 der Wanddicke der Rohrleitung 2 zu nähern. Als Folge kann das Auftreten von Rissen am Schweißabschnitt zwischen der Manschette 4 und der Rohrleitung 2 unterdrückt und die Schweißstärke zwischen der Manschette 4 und der Rohrleitung 2 erhöht werden.
• (1d) In der AGR, in welcher die Temperaturänderung aufgrund eines intermittierend fließenden Abgases mit hoher Feuchtigkeit und Temperatur stark ist und eine Korrosion aufgrund von Kondensation leicht auftritt, kann eine Korrosion des Flansches 3 effektiv unterdrückt werden und die Kosten der Kupplungsstruktur 1 können reduziert werden.
• (1e) Durch die beiden Ohrabschnitte 4C, an denen die Durchgangsbohrung 4D jeweils vorgesehen ist, kann die Positionierung der Manschette 4 für den Flansch 3 leicht vorgenommen werden. Als Folge kann die Anzahl der Arbeitsgänge reduziert und die Positionsgenauigkeit erhöht werden.

According to the embodiment described in detail above, the following effects are obtained:

• (1a) It is possible to use the flange 3 Made from a cost-effective metal material to form and suppress corrosion by removing part of the flange 3 (ie the middle range 3B ), with which the exhaust gas may be in contact, with the cuff 4 is covered with a high corrosion resistance. The cuff 4 In contrast to the flange, it can easily reduce the thickness. It is therefore possible the cost of the coupling structure 1 reduce while corrosion of the flange 3 is suppressed.
• (1b) By welding the cuff 4 to the flange 3 can be suppressed that the flange 3 during assembly of the coupling structure 1 moved freely to the counterpart component. As a result, machinability increases when the flange is tightened 3 , Further, as the through the flange 3 generated surface pressure evenly on the cuff 4 can be transferred, the sealing performance increases.
• (1c) The cuff 4 is at her ring section 4A by projection welding, whose input heat quantity is small compared to arc welding, with the flange 3 connected, so that it is possible, the distortion of the attraction surface of the ring section 4A to reduce and increase the flatness. Further, by using projection welding, the thickness of the cuff 4 It is possible to reduce the thickness of the cuff 4 the wall thickness of the pipeline 2 to approach. As a result, the occurrence of cracks at the weld portion between the cuff 4 and the pipeline 2 suppressed and the welding strength between the cuff 4 and the pipeline 2 increase.
• (1d) In the EGR in which the temperature change due to an intermittently flowing exhaust gas having high humidity and temperature is strong and corrosion due to condensation easily occurs, corrosion of the flange may occur 3 be effectively suppressed and the cost of the coupling structure 1 can be reduced.
• (1e) Through the two ear sections 4C at which the through hole 4D is provided in each case, the positioning of the cuff 4 for the flange 3 be easily made. As a result, the number of operations can be reduced and the position accuracy can be increased.

Specifically, a pedestal with multiple upright pins in welding the cuff 4 and the flange 3 used. In the through holes 4D the cuff 4 be the pins of the socket and into the through holes 3D of the flange 3 inserted the pins for fixing the flange to perform welding. This will cause a rotation of the cuff 4 prevents and the position of the cuff 4 for the flange 3 determined with high accuracy.

Other embodiments

• (2a) Es ist auch möglich, in der Kupplungsstruktur 1 der Rohrleitung gemäß der obigen Ausführungsform statt des Projektionsschweißens unter Verwendung von Punktschweißen die Manschette 4 mit dem Flansch 3 zu verbinden. Es ist ferner auch möglich, durch ein anderes Mittel als Schweißen die Manschette 4 mit dem Flansch 3 zu verbinden.
• (2b) Die Kupplungsstruktur 1 der Rohrleitung gemäß der obigen Ausführungsform kann auch auf eine Rohrleitung, die einen anderen Strömungsweg von Abgas als AGR ausbildet, angewendet werden. D. h. die Kupplungsstruktur 1 kann auf eine beliebige Rohrleitung des Abgaskrümmers in 1 angewendet werden.
• (2c) In der Kupplungsstruktur 1 der Rohrleitung gemäß der obigen Ausführungsform kann die Manschette 4 einen Ohrabschnitt 4C oder drei oder mehrere Ohrabschnitte 4C aufweisen. Die Manschette 4 muss ferner nicht unbedingt den Ohrabschnitt 4C aufweisen.
• (2d) In der Kupplungsstruktur 1 der Rohrleitung gemäß der obigen Ausführungsform kann die Dichtung den Vorsprung 6A, der in beiden Dickenrichtungen vorsteht, auch aufweisen, wie in 4 gezeigt. Der Vorsprung 6A ist am mittleren Bereich in radialer Richtung der Dichtung kreisringförmig vorgesehen. In 4 erstreckt sich der Ringabschnitt 4A ferner im Vergleich zum Vorsprung 6A radial nach außen. Durch Drücken des Vorsprungs 6A durch den Ringabschnitt 4A bei Anziehen des Flansches erhöht sich die Dichtungsleistung.
• (2e) Die Funktion eines einzigen Bestandteils in der obigen Ausführungsform kann als mehrere Bestandteile verteilt werden oder die Funktionen von mehreren Bestandteilen können in einen einzigen Bestandteil integriert werden. Außerdem kann ein Teil der Ausbildung gemäß der obigen Ausführungsform weggelassen werden. Außerdem kann mindestens ein Teil der Ausbildung gemäß der obigen Ausführungsform zur Ausbildung in den anderen oben beschriebenen Ausführungsformen hinzugefügt, ersetzt od. dgl. werden. Alle Aspekte, die im technischen Gedanken enthalten sind, der aus dem in den Patentansprüchen angegebenen Wortlaut spezifiziert wird, gelten als Ausführungsformen der vorliegenden Offenbarung.

Although the embodiment of the present disclosure has been described above, it should be understood that the present disclosure is not limited to the above-described embodiment but may take various forms.

• (2a) It is also possible in the coupling structure 1 the pipeline according to the above embodiment instead of the projection welding using spot welding the sleeve 4 with the flange 3 connect to. It is also possible, by a means other than welding the sleeve 4 with the flange 3 connect to.
• (2b) The coupling structure 1 The piping according to the above embodiment may also be applied to a piping forming a different flow path of exhaust gas than EGR. Ie. the coupling structure 1 can be installed on any manifold of the exhaust manifold 1 be applied.
• (2c) In the coupling structure 1 the piping according to the above embodiment, the cuff 4 an ear section 4C or three or more ear cuts 4C respectively. The cuff 4 It also does not necessarily have the ear section 4C respectively.
• (2d) In the coupling structure 1 the pipeline according to the above embodiment, the seal, the projection 6A , which protrudes in both thickness directions, also have, as in 4 shown. The lead 6A is provided at the central region in the radial direction of the gasket annular. In 4 the ring section extends 4A further compared to the projection 6A radially outward. By pressing the tab 6A through the ring section 4A when the flange is tightened, the sealing performance increases.
• (2e) The function of a single component in the above embodiment may be distributed as plural components, or the functions of plural components may be integrated into a single component. In addition, a part of the configuration according to the above embodiment can be omitted. In addition, at least part of the construction according to the above embodiment may be added, replaced, or the like for formation in the other embodiments described above. All aspects contained in the technical idea specified in the wording indicated in the claims are considered as embodiments of the present disclosure.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2009250338 A [0002]

Claims (3)

A coupling structure (1) for mounting a pipeline (2), which forms a flow path of exhaust gas discharged from an internal combustion engine, provided with - a flange (3) and a cuff (4), wherein the flange (3) can be attracted to a mating flange via a gasket and has an opening (3A) and a central area (3B), in the opening (3A), the pipe (2) can be inserted, the central region (3B) extends radially outwardly from the opening (3A) and descends in the thickness direction of the flange (3), the sleeve (4) is made of a metal having a higher corrosion resistance than that of a metal constituting the flange (3) and having a tubular portion (4B) and a ring portion (4A), the tubular portion (4B) has a shape covering the entire circumference of the outer peripheral surface of the pipe (2) and can be connected at a first end to the entire circumference of the outer peripheral surface of the pipe (2); the ring portion (4A) then extends radially outwardly adjacent to a second end of the tubular portion (4B) at least in comparison to the opening of the seal and is connected to the flange (3) in the central region (3B). Coupling structure (1) of the pipeline after Claim 1 , wherein the pipeline (2) forms an exhaust gas recirculation. Coupling structure (1) of the pipeline after Claim 1 or 2 wherein the collar (4) further comprises at least one ear portion (4C) projecting radially outwardly of the tube (2) from the ring portion (4A), wherein a through hole (4D) is provided on the at least one ear portion (4C).

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