JP2018173065A - Exhaust emission control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control system that can be readily shaped by press working and includes an elbow member made of a sheet metal that can be readily jointed by welding.SOLUTION: While first and second split members 31, 32 constituting an elbow member 30 made of a sheet metal are joined by first and second junction parts 31a, 32a, end faces of the first and second junction parts are arranged so as to be parallel to a surface including an opening part 20a of a flange member 20, a first opening end part 30a is joined to the flange member and first and second fitting parts 31b, 32b are joined upstream of a catalytic converter 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an exhaust gas purification device, and more particularly to an exhaust gas purification device including a catalytic converter that is connected to an exhaust system of an internal combustion engine.

  In order to process exhaust gas discharged from the exhaust system of the internal combustion engine at a high temperature upstream, an exhaust gas purification device in which a catalytic converter is disposed immediately below the exhaust port and is connected to the exhaust port through a shortest pipeline is frequently used. It is known as a so-called manipulator. As an exhaust system in which this type of catalytic converter is connected in communication, there are a plurality of exhaust manifolds gathered in a single exhaust port, a turbocharger exhaust port, and a flange member having an opening communicating therewith. And the catalytic converter is joined.

  As an example of the former, the following Patent Document 1 discloses an exhaust gas purification device that purifies exhaust gas using a direct type catalyst disposed at the downstream end of an exhaust port assembly or an exhaust manifold. FIG. FIG. 2 shows an upstream portion of a direct type catalyst not provided with a pressure loss adjusting member characterized in Patent Document 1. As an example of the latter, Patent Document 2 below discloses a connection structure between a turbine housing and a converter connected to the turbine housing, and the converter is connected to the turbine housing via a catalyst elbow and a flange. .

Japanese Patent No. 4475980 Japanese Patent Laid-Open No. 2006-160806

  The converter vessel, exhaust manifold, and catalyst elbow that make up the exhaust gas purification device above are made of metal plating, typically stainless steel, instead of casting because of recent demands for weight reduction, high heat resistance, and low heat mass. Is used. In particular, the catalyst elbow shown in FIG. 1 of Patent Document 2 and the upstream case shown in FIG. 10 of Patent Document 1 have a complicated three-dimensional curved surface. As is apparent from FIG. 1 of Patent Document 2, the catalyst elbow is formed by joining a plurality of divided members, and the joining surface of each member also has a three-dimensional shape. The catalyst elbow and the upstream case can be referred to as an elbow member joined to the catalytic converter. However, it is difficult to press and weld such elbow members, which increases costs. It has become.

  Accordingly, the present invention provides an exhaust gas purification system that includes a metal elbow member that can be easily formed by pressing and can be easily joined by welding while satisfying the design requirements of the elbow member joined to the catalytic converter. It is an object to provide an apparatus.

  In order to achieve the above object, the present invention provides an exhaust gas purifying apparatus including a catalytic converter that is connected in communication with an exhaust system of an internal combustion engine, wherein the opening is joined to the internal combustion engine and communicates with the exhaust system. A flange member having a first opening end that is joined to the flange member and communicates with the opening, and an end surface that forms a predetermined angle with respect to an end surface of the first opening end, And a metal elbow member having a second open end joined to the upstream side of the catalytic converter, the elbow member having a first fitting part joined to the upstream side of the catalytic converter. A first split member having the first opening end on one side and having a first joint on the opposite side; and the second opening connected to the upstream side of the catalytic converter. It has the 2nd fitting part which constitutes an end And a second split member having a second joint portion joined to the first joint portion, wherein the first and second split members are the first and second joint portions. In the joined state, the end surfaces of the first and second joint portions are arranged in parallel to the surface including the opening portion of the flange member, and the first opening end portion is joined to the flange member. In addition, the exhaust gas purifying device has the first and second fitting portions joined to the upstream side of the catalytic converter. The above-mentioned “parallel” means substantially parallel and does not exclude a slight angle.

  In the exhaust gas purifying apparatus described above, a sensor for detecting a component of exhaust gas discharged from the exhaust system may be provided, and the second divided member may have a pedestal surface that supports the sensor. . Furthermore, the second divided member may have a wall surface facing the opening of the flange member between the pedestal surface and the second joint portion.

  On the other hand, the first split member may be fixed such that the outer surface of the first opening end is in close contact with the inner surface of the opening of the flange member. The predetermined angle of the end face of the second opening end with respect to the end face of the first opening end may be 90 degrees, for example.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, the present invention has a flange member that is joined to the internal combustion engine and has an opening that communicates with the exhaust system, a first opening end that is joined to the flange member and communicates with the opening, and the first And an elbow member made of metal having a second opening end joined to the upstream side of the catalytic converter, the elbow member having an end face forming a predetermined angle with respect to the end face of the opening end, A first split member having a first fitting portion joined to the upstream side, a first opening end portion on one side surface, and a first joint portion on the opposite side surface; A second split member having a second fitting part joined to the first joining part and having a second fitting part joined to the upstream side of the converter and constituting a second opening end part; And the first and second divided members are joined at the first and second joints. In this state, the end surfaces of the first and second joint portions are arranged so as to be parallel to the surface including the opening portion of the flange member, the first opening end portion is joined to the flange member, and the first Since the first and second fitting portions are joined to the upstream side of the catalytic converter, the curved surface portion formed on the elbow member and the joint portions of the first and second divided members constituting the elbow member are surely provided. Since there is no possibility of interference with each other, the degree of freedom of the shape of the elbow member is remarkably improved. Moreover, since the joint part of the 1st and 2nd division member can be made into a substantially plane, while being able to shape | mold easily the 1st and 2nd division member by press work, both division members are easy by welding. Can be joined.

  If the second divided member has a pedestal surface that supports the sensor, the curved surface portion including the pedestal surface and the joint portion of the first and second divided members can be reliably separated. The degree of freedom of the shape of the elbow member is remarkably improved. Furthermore, if the second split member has a wall surface facing the opening of the flange member between the pedestal surface and the second joint, the opening of the flange member and the exhaust member of the internal combustion engine Exhaust gas introduced into the elbow member through the first opening end of the elbow member collides with the wall surface and is forced to change in the direction of the second opening end, thereby detecting the sensor at the tip of the sensor. Therefore, the detection accuracy of the sensor is improved. The exhaust flow redirected toward the second opening end portion is directed toward the upper end surface of the catalyst carrier in the catalytic converter, so that the exhaust flow is uniformly supplied to the upper end surface of the catalyst carrier and the purification rate is improved. To do.

  In addition, if the first dividing member is configured such that the outer surface of the first opening end is in close contact with the inner surface of the opening of the flange member, the first dividing member does not require a separate connecting member. Therefore, the elbow member can be designed with a higher degree of freedom. It should be noted that the predetermined angle between both end surfaces of the first and second opening end portions of the elbow member can be set to various angles including 90 degrees.

It is a front view of the exhaust-gas purification apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the flange member and elbow member in one Embodiment of this invention. 1 is a left side view of a part of an exhaust gas purification apparatus according to an embodiment of the present invention. 1 is a right side view of a part of an exhaust gas purification apparatus according to an embodiment of the present invention. It is an expanded sectional view of the 1st opening end part in one embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 to 4 show an exhaust gas purifying apparatus according to an embodiment of the present invention, which includes a catalytic converter 10, a flange member 20, and an elbow member 30. FIG. The catalytic converter 10 has a catalyst carrier 11 built in a cylindrical main body portion 10a as in the conventional case, and the upstream end portion 10b has the same diameter as the main body portion 10a and the maximum diameter portion. The downstream end portion 10c is reduced in diameter and has a conical shape, and a flange member 50 to be joined to an exhaust pipe (not shown) is fixed to the minimum diameter portion (straight pipe portion). . The mounting brackets 12 and 13 are fixed to the main body 10a.

  The flange member 20 of the present embodiment is a plate made of iron or stainless steel, has an opening 20a communicating with an exhaust system of an internal combustion engine (not shown), and has a cylinder head (not shown) or a turbo housing ( (Not shown). On the other hand, the elbow member 30 is made of stainless steel, has a first opening end 30a communicating with the opening 20a of the flange member 20, and has a predetermined angle with respect to the end surface of the first opening end 30a (this embodiment). The second open end 30b is joined to the upstream side of the catalytic converter 10.

  The elbow member 30 of the present embodiment is formed by joining a first divided member 31 and a second divided member 32. The first split member 31 has a first fitting portion 31b joined to the upstream side of the catalytic converter 10, has a first opening end portion 30a on one side surface, and a first opening portion 30a on the opposite side surface. 1 joint portion 31a. The second split member 32 is joined to the upstream side of the catalytic converter 10, has a second fitting portion 32b that constitutes the second opening end 30b, and is joined to the first joint 31a. 2 joints 32a.

  As shown in FIG. 2, the surface including the opening 20 a of the flange member 20 in a state where the first and second divided members 31 and 32 are joined by the first and second joining portions 31 a and 32 a. The first and second joint portions 31a and 32a are arranged so that the end faces thereof are substantially parallel to each other, the first opening end portion 30a is joined to the flange member 20, and the first and second joint portions 31a and 32a are joined together. The fitting portions 31 b and 32 b are joined to the upstream end portion 10 b of the catalytic converter 10. In the present embodiment, the first and second split members 31 and 32 are superposed as shown in FIG. 2, and the end surfaces of the first and second joint portions 31a and 32a are the central axes of the main body portion 10a, respectively. They are joined so as to be parallel in the vicinity of the surface including CL, and the overlapped portion is welded (indicated by w in FIG. 2). Therefore, when the first and second divided members 31 and 32 are pressed, a negative angle is not formed, and the first and second divided members 31 and 32 can be molded easily and smoothly.

  Thus, as shown in FIG. 2, the curved surface portion formed on the elbow member 30 and the joint portion of the first and second divided members 31 and 32 are reliably separated, and there is no possibility of interfering with each other. Therefore, the degree of freedom of the shape of the elbow member is remarkably improved. Moreover, since the joint part of the 1st and 2nd division members 31 and 32 can be made into a substantially plane, while being able to shape | mold easily the 1st and 2nd division members 31 and 32 by press work, welding Thus, both divided members can be easily joined.

  On the other hand, the first split member 31 is disposed such that the outer surface of the first opening end 30a is in close contact with the inner surface of the opening 20a of the flange member 20, and is welded at the tip of the first opening end 30a. (Indicated by w in FIG. 2) and fixed. In particular, as shown in an enlarged view in FIG. 5, the first opening end 30a is a tip portion of a burring portion erected from the general surface of the first split member 31, and this portion is a conventional connecting member. Function as. The first opening end 30a is disposed so that the tip end surface thereof is positioned at the intermediate portion in the axial direction of the opening 20a of the flange member 20, and the entire circumference of the first opening end 30a and the opening 20a. The inner surface is fixed by fillet welding (indicated by w in FIG. 5). Thus, since the flange member 20 can be tightly bonded to the flange member 20 via the first opening end 30a without requiring a separate connection member, the design freedom of the elbow member 30 is greatly improved.

  Further, a sensor (not shown) for detecting a component of exhaust gas discharged from the exhaust system is provided. The second divided member 32 has a pedestal surface 32c, to which a sensor pedestal 40 is joined. ing. Thereby, since the curved surface part including the pedestal surface 32c and the joint part of the 1st and 2nd division members 31 and 32 can be isolate | separated reliably, the freedom degree of the shape of the elbow member 30 improves remarkably. An opening 32e for sensor insertion is formed in the pedestal surface 32c. As shown in FIGS. 2 and 3, the pedestal 40 is fitted into the opening 32e, and the stepped portion is engaged with the peripheral portion of the opening 32e. It is configured to be stopped.

  Moreover, the 2nd division member 32 has the wall surface 32d which opposes the opening part 20a of the flange member 20 between the base surface 32c and the 2nd junction part 32a, as shown in FIG.1 and FIG.2. Thus, the exhaust gas introduced into the elbow member 30 from the exhaust system of the internal combustion engine through the opening 20a of the flange member 20 and the first opening end 30a of the elbow member 30 collides with the wall surface 32d. Since the direction is forcedly changed in the direction of the second opening end 30b and the sensor is reliably in contact with the detection portion at the tip of the sensor, the detection accuracy of the sensor is improved. The exhaust flow redirected in the direction of the second opening end 30b is directed to the upper end surface of the catalyst carrier 11 in the catalytic converter 10, and is supplied uniformly to the upper end surface of the catalyst carrier 11. , Its purification rate is improved.

DESCRIPTION OF SYMBOLS 10 Catalytic converter 11 Catalyst support | carrier 20 Flange member 20a Opening part 30 Elbow member 30a 1st opening edge part 31 1st division member 31a 1st junction part 31b 1st fitting part 32 2nd division member 32a 2nd Joint portion 32b second fitting portion 32c pedestal surface 32d wall surface 32e opening 40 pedestal

Claims (5)

An exhaust gas purification apparatus comprising a catalytic converter that is connected in communication with an exhaust system of an internal combustion engine,
A flange member joined to the internal combustion engine and having an opening communicating with the exhaust system;
The first opening end connected to the flange member and communicated with the opening has an end surface that forms a predetermined angle with respect to the end surface of the first opening end, and is located upstream of the catalytic converter. An elbow member made of a plating having a second opening end to be joined;
The elbow member is
A first fitting portion joined to the upstream side of the catalytic converter; the first opening end portion on one side surface; and a first joining portion on the opposite side surface. A split member;
A second joint that is joined to the upstream side of the catalytic converter, has a second fitting part that constitutes the second opening end, and has a second joint joined to the first joint. A split member,
In a state where the first and second divided members are joined at the first and second joints, the end surfaces of the first and second joints are in a plane including the opening of the flange member. It arrange | positions so that it may become parallel, and while the said 1st opening edge part is joined to the said flange member, the said 1st and 2nd fitting part is joined to the upstream of the said catalytic converter. Exhaust gas purification device. A sensor for detecting a component of exhaust gas discharged from the exhaust system;
The second divided member is
The exhaust gas purification device according to claim 1, further comprising a pedestal surface that supports the sensor. The second divided member is
The exhaust gas purification device according to claim 2, further comprising a wall surface facing the opening of the flange member between the pedestal surface and the second joint portion. The first divided member is
The exhaust gas purification device according to any one of claims 1 to 3, wherein an outer surface of the first opening end is fixed in close contact with an inner surface of the opening of the flange member. The exhaust gas purification device according to any one of claims 1 to 4, wherein a predetermined angle of an end surface of the second opening end portion with respect to an end surface of the first opening end portion is 90 degrees.

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