JP6653970B2 - Exhaust gas purification device - Google Patents

Description

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

  In order to treat the exhaust gas discharged from the exhaust system of the internal combustion engine at a high temperature upstream, an exhaust gas purifying device in which a catalytic converter is disposed immediately below the exhaust port and is connected to the exhaust port with a pipe as short as possible is often used. It is known as a so-called maniverter. As an exhaust system to which this type of catalytic converter is connected and connected, there are a plurality of exhaust manifolds assembled into a single exhaust port, a turbocharger exhaust port, and a flange member having an opening communicating with these. The catalytic converter is joined through the.

  As an example of the former, Patent Document 1 below discloses an exhaust gas purifying apparatus that purifies exhaust gas by a direct-type catalyst disposed at an exhaust port collecting portion or a downstream end of an exhaust manifold, and FIG. 1 illustrates an upstream portion of a direct type catalyst that does not include a pressure loss adjusting member that is characterized by Patent Document 1. As an example of the latter, Patent Literature 2 below discloses a connection structure between a turbine housing and a converter connected thereto, and the converter is connected to the turbine housing via a catalyst elbow and a flange. .

Japanese Patent No. 4475980 JP-A-2006-160806

  The converter vessel, exhaust manifold, and catalyst elbow that make up the above exhaust gas purification device are made of sheet metal such as stainless steel in place of cast products due to 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 surfaces of the members are also three-dimensional. The above-mentioned catalyst elbow or upstream case can be said to be an elbow member to be joined to the catalytic converter. However, if such an elbow member is made of sheet metal, press working and welding work are difficult and cost increase factors. Has become.

  Accordingly, the present invention provides an exhaust gas purifying apparatus having a sheet metal elbow member which can be easily formed by press working and can be easily joined by welding while satisfying the design requirements of an elbow member to be joined to a catalytic converter. It is an object to provide a device.

In order to achieve the above object, the present invention provides an exhaust gas purification device including a catalytic converter that is connected to an exhaust system of an internal combustion engine, the opening being connected to the internal combustion engine and communicating with the exhaust system. A flange member having a first opening end joined to the flange member and communicating with the opening, and having an end surface forming a predetermined angle with respect to an end surface of the first opening end; A sheet metal elbow member having a second open end joined to an upstream side of the catalytic converter; and a sensor for detecting a component of exhaust gas discharged from the exhaust system , wherein the elbow member includes the catalyst. A first split member having a first fitting portion joined to the upstream side of the converter, having the first open end on one side surface, and having a first joining portion on the opposite side surface; And the upstream side of the catalytic converter A second split member having a second joint portion joined to the first joint portion, the second split member having a second fitting portion joined to the second opening end portion, In a state in which the first and second divided members are joined at the first and second joints, the end faces of the first and second joints are arranged with respect to a surface including the opening of the flange member. The first opening end is joined to the flange member, and the first and second fitting portions are joined to the upstream side of the catalytic converter, and the first opening end is joined to the flange member . An exhaust gas purifying apparatus includes two divided members each having a pedestal surface that supports the sensor . The term "parallel" means substantially parallel, and does not exclude a slight angle.

In the above exhaust gas purifying apparatus, the second divided member, between the second junction and the base face, may be assumed to have a wall surface facing the opening of the flange member.

  On the other hand, it is preferable that the first divided member has an outer surface of the first opening end portion closely fixed to an inner surface of the opening portion of the flange member. The predetermined angle of the end face of the second open end with respect to the end face of the first open end may be, for example, 90 degrees.

The present invention has the following effects because it is configured as described above. That is, the present invention has a flange member joined to an internal combustion engine and having an opening communicating with an exhaust system, a first opening end joined to the flange member and communicating with the opening, and a first member. A sheet metal elbow member having an end surface forming a predetermined angle with respect to the end surface of the open end and having a second open end joined to the upstream side of the catalytic converter; and a component of exhaust gas discharged from the exhaust system and a sensor for detecting an elbow member has a first fitting part that is joined to the upstream side of the catalytic converter, and having a first open end on one side, to the opposite side A first splitting member having a first joining portion, a second fitting portion joined to an upstream side of the catalytic converter and forming a second open end, and joined to the first joining portion; And a second split member having a second joint portion. And in a state where the second divided member is joined at the first and second joints, the end faces of the first and second joints are parallel to a surface including the opening of the flange member. The first opening end is joined to the flange member, the first and second fitting parts are joined to the upstream side of the catalytic converter, and the second divided member is a pedestal supporting the sensor. der those having a surface Runode, and a curved portion formed in the elbow member, the joining portion of the first and second divided members are reliably separated constituting the elbow member, mutual interference fear rather Na Since the curved surface portion including the pedestal surface and the joint portion between the first and second divided members can be reliably separated, the degree of freedom of the shape of the elbow member is significantly improved. In addition, since the joint between the first and second divided members can be made substantially flat, the first and second divided members can be easily formed by press working, and both divided members can be easily formed by welding. Can be joined.

Furthermore, if the second divided 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 opening of the flange member can be removed from the exhaust system 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 forcibly turned in the direction of the second opening end, and the detection portion at the sensor tip , The detection accuracy of the sensor is improved. Then, the exhaust stream deflected in the direction of the second opening end portion is directed to 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. I do.

  Further, if the first split member has a configuration in which the outer surface of the first opening end is tightly fixed to the inner surface of the opening of the flange member, the first split member does not require a separate connecting member, and the first split member does not require the first connecting member. Can be tightly joined to the flange member through the opening end of the elbow member, so that the degree of freedom in designing the elbow member is improved. The predetermined angle between both end surfaces of the first and second opening ends of the elbow member can be set to various angles including 90 degrees.

It is a front view of an exhaust gas purification device concerning one embodiment of the present 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 device according to an embodiment of the present invention. 1 is a right side view of a part of an exhaust gas purification device according to an embodiment of the present invention. It is an expanded sectional view of the 1st opening end 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. The catalytic converter 10 has a catalyst carrier 11 built in a cylindrical main body 10a as in the prior art, and an upstream end 10b has the same diameter as the main body 10a and has a maximum diameter. The downstream end 10c has a conical shape with a reduced diameter, and a flange member 50 joined to an exhaust pipe (not shown) is fixed to a minimum diameter portion (a straight pipe portion). . The mounting brackets 12 and 13 are fixed to the main body 10a.

  The flange member 20 of this 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) of the internal combustion engine. (Not shown). On the other hand, the elbow member 30 is made of stainless steel sheet metal, 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). In this case, the second opening 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 open end 30a on one side, and has a first open end 30a on the opposite side. It has one joint 31a. The second split member 32 is joined to the upstream side of the catalytic converter 10, has a second fitting portion 32b constituting a second opening end 30b, and is joined to the first joining portion 31a. It has two joints 32a.

  Then, as shown in FIG. 2, a 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 at the first and second joints 31 a and 32 a. The first and second joints 31a and 32a are arranged so that the end faces thereof are substantially parallel to each other. The first open end 30a is joined to the flange member 20, and the first and second joints 31a and 32a are joined together. The fitting portions 31b and 32b are joined to the upstream end 10b of the catalytic converter 10. In the present embodiment, the first and second divided members 31 and 32 are superimposed as shown in FIG. 2, and the end surfaces of the first and second joints 31a and 32a are respectively the central axes of the main body 10a. It is joined so as to be parallel in the vicinity of the plane including the CL, and the overlapped portion is welded (shown by w in FIG. 2). Therefore, when pressing the first and second divided members 31 and 32, a negative angle is not formed, and the first and second divided members 31 and 32 can be formed easily and smoothly.

  Thus, as shown in FIG. 2, the curved surface formed on the elbow member 30 and the joint between the first and second divided members 31 and 32 are reliably separated from each other, and there is no possibility of mutual interference. Therefore, the degree of freedom of the shape of the elbow member is significantly improved. In addition, since the joint between the first and second divided members 31 and 32 can be substantially flat, the first and second divided members 31 and 32 can be easily formed by press working, and can be welded. Thereby, 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). In particular, the first open end portion 30a is a tip portion of a burring portion raised from the general surface of the first divided member 31 as shown in an enlarged view in FIG. 5, and this portion is a conventional connecting member. Function as The first opening end 30a is disposed such that the tip end surface is located at an axially intermediate portion 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, the elbow member 30 can be tightly joined to the flange member 20 via the first opening end 30a without requiring a separate connection member, so that the degree of freedom in designing the elbow member 30 is greatly improved.

  Further, a sensor (not shown) for detecting a component of the exhaust gas discharged from the exhaust system is provided. The second divided member 32 has a pedestal surface 32c, and a pedestal 40 for the sensor is joined to the pedestal surface 32c. ing. As a result, the curved surface portion including the pedestal surface 32c and the joint portion between the first and second divided members 31 and 32 can be reliably separated, so that the degree of freedom of the shape of the elbow member 30 is significantly improved. An opening 32e for inserting a sensor 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 step portion is engaged with the peripheral edge of the opening 32e. It is configured to be stopped.

  As shown in FIGS. 1 and 2, the second divided member 32 has a wall surface 32d facing the opening 20a of the flange member 20 between the pedestal surface 32c and the second joint 32a. 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, The sensor is forcibly turned in the direction of the second opening end portion 30b and surely contacts the detection portion at the tip of the sensor, so that the detection accuracy of the sensor is improved. Then, the exhaust flow diverted 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 uniformly supplied to the upper end surface of the catalyst carrier 11. , Its purification rate is improved.

DESCRIPTION OF SYMBOLS 10 Catalytic converter 11 Catalyst carrier 20 Flange member 20a Opening 30 Elbow member 30a First opening end 31 First divided member 31a First joint 31b First fitting part 32 Second divided member 32a Second Joint portion 32b second fitting portion 32c pedestal surface 32d wall surface 32e opening 40 pedestal

Claims (4)

An exhaust gas purification device comprising a catalytic converter that is connected to 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;
A first opening end connected to the flange member and communicating with the opening, and having an end surface forming a predetermined angle with respect to an end surface of the first opening end, on an upstream side of the catalytic converter; A sheet metal elbow member having a second open end to be joined ;
A sensor for detecting a component of exhaust gas discharged from the exhaust system ,
The elbow member,
A first fitting portion that is joined to an upstream side of the catalytic converter, the first fitting portion having the first opening end on one side surface, and a first joining portion on an opposite side surface; A split member;
A second fitting part joined to the upstream side of the catalytic converter, the second fitting part constituting the second opening end, and a second joining part joined to the first joining part; With a dividing member,
In a state in which the first and second divided members are joined at the first and second joints, the end faces of the first and second joints are arranged with respect to a surface including the opening of the flange member. The first opening end is joined to the flange member, and the first and second fitting portions are joined to the upstream side of the catalytic converter, and the first opening end is joined to the flange member .
The second split member is
An exhaust gas purification device having a pedestal surface for supporting the sensor . The second divided member includes:
Between the second junction and the base face, the exhaust gas purifying apparatus according to claim 1, characterized by having a wall surface facing the opening of the flange member. The first divided member includes:
It said first exhaust gas purification device according to claim 1 or 2, wherein the outer surface of the open end is characterized in that it is fixed in close contact with the inner surface of the opening portion of the flange member. Exhaust gas purification device according to any one of claims 1 to 3 given angle of the end face of the second opening end portion to the end surface of the first open end is characterized in that it is a 90 degrees.

Images