JP2014218956A - Exhaust gas treatment device for diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas treatment device for a Diesel engine comprising an inlet pipe, an outlet pipe and a treatment container of which structure can be manufactured in less-expensive manner through a sheet metal work without increasing the number of steps and generating any loss of material.SOLUTION: An exhaust gas treatment device 20 for a Diesel engine 1 is constructed such that an opening end 44 at a rear side of an inlet pipe 40 is covered by a shallow cup-shaped end cap 60 having a cap main body plate 61 and an edge plate 62. It is possible to cover a recess caused by welding generated at the opening end 44 with the edge plate 62. After a metallic plate is bent to be formed into a cylindrical shape and its connecting portions are welded, a cutting step in which the end part of the attained metallic cylinder is cut to remove the recessed portion is eliminated. Since the cutting step is eliminated, a post-treatment for the cutting plane such as burr removal is also eliminated. No loss of material caused by cutting work occurs.

Description

  The present invention relates to an exhaust gas treatment apparatus for a diesel engine that purifies exhaust gas using DOC (diesel oxidation catalyst), DPF (diesel particulate filter), or the like.

  In this type of exhaust gas treatment device for a diesel engine, an exhaust gas treatment unit such as DOC or DPF is built in a split cylindrical container, and exhaust gas introduced from an inlet pipe attached to one end of the cylindrical container is exhaust gas. The exhaust gas is purified through the treatment section and the purified exhaust gas is discharged from an outlet pipe attached to the opposite end of the cylindrical container. An exhaust gas treatment apparatus having this configuration is disclosed in Patent Document 1. The cylindrical container, the inlet pipe, and the outlet pipe of the exhaust gas treatment apparatus are generally made of sheet metal, and are manufactured by drilling, bending, welding, or the like of a metal plate. For example, the manufacture of the inlet pipe is performed as follows. Hole processing is performed on a metal plate having a predetermined width and length. The metal plate after drilling is rounded into a cylindrical shape and joined by welding to obtain a metal cylinder. An end cap is welded to the rear end opening of the metal tube.

JP 2011-208572 A

  Here, in the manufacture of the sheet metal inlet pipe and the like of such an exhaust gas treatment apparatus, there are the following problems to be solved. Referring to FIG. 6, the cylindrical processing vessel 101, the inlet pipe 102, and the outlet pipe 103 of the exhaust gas processing apparatus 100 are manufactured by rolling a metal plate into a cylindrical shape and welding along a joint. . In this case, an inward depression is formed in the weld joint exposed at the end face of the obtained metal cylinder. When a depression is generated in the annular end surface of the metal cylinder, a large gap is formed between the annular end surface and the outer peripheral edge of the end cap in a state where the end cap is attached to the annular end surface. Such a gap is undesirable from the viewpoint of the strength of the processing vessel 101, the inlet pipe 102, and the outlet pipe 103.

  Further, in the exhaust gas treatment apparatus 100, the inlet pipe 102 and the outlet pipe 103 are generally arranged in a state of penetrating the processing container 101 in the orthogonal direction. In some cases, the ends of the inlet pipe 102 and the outlet pipe 103 covered with the end caps 104 and 105 are exposed from the processing container 101 to the outside. In this case, if the recesses by welding are formed on the rear end surfaces of the inlet pipe 102 and the outlet pipe 103, the rear end openings of the inlet pipe 102 and the outlet pipe 103 are completely opened even if the end caps 104 and 105 are covered. Cannot be sealed.

  Such a problem also occurs in the processing container 101. End plates 106 and 107 are welded and sealed at both ends of the sheet metal processing vessel 101. The processing vessel 101 can be manufactured at a low cost by rounding and welding a metal plate into a cylindrical shape, but if a dent due to welding occurs, a problem similar to that of the inlet pipe 102 described above occurs.

  For this reason, in the prior art, taking into account the depression of the end of the joint of the metal cylinder by welding, a long metal cylinder is manufactured, the end is cut into a metal cylinder with a flat annular end surface, An end cap is welded to the end of the metal cylinder. As a result, a separate cutting step is required, and a deburring step for the annular end surface, which is a cut surface, is also required. Moreover, since the end of the metal cylinder is cut, the waste of material increases. Such an increase in the number of steps and the generation of waste of materials are undesirable because they increase the manufacturing cost of the exhaust gas treatment apparatus.

  In view of these points, an object of the present invention is to provide an inlet pipe, an outlet pipe, or a processing container having a structure that can be manufactured at low cost by sheet metal processing without increasing the number of processes and without wasting materials. Another object is to propose an exhaust gas treatment device for a diesel engine.

  The exhaust gas treatment apparatus for a diesel engine according to the present invention has a cylindrical treatment container with a built-in exhaust gas treatment part, and the exhaust gas is introduced into the exhaust gas treatment part or processed from the exhaust gas treatment part. A pipe for discharging the exhaust gas later is attached, and one end of the pipe is covered with an end cap. The pipe is manufactured by rolling a metal plate having a predetermined width and length into a cylindrical shape and welding a joint of the metal plate. The end cap includes a cap main body plate and an annular edge plate that is bent from an outer peripheral edge of the cap main body plate and extends in a direction toward the pipe outer peripheral surface of the pipe, and is provided at the opening end of the pipe outer peripheral surface. The continuous outer peripheral surface portion of the pipe is covered with the edge plate of the end cap over the entire periphery. The edge of the edge plate is welded to a portion of the pipe outer peripheral surface facing the edge.

  In the exhaust gas treatment apparatus for a diesel engine according to the present invention, an end cap provided with a cap body plate and an edge plate is put on an open end of a pipe used as an inlet pipe or an outlet pipe. By attaching such a petri dish-shaped or flat cup-shaped end cap, it is possible to cover a hollow formed by welding at the open end of the pipe. Therefore, after the metal plate is bent and rounded into a cylindrical shape and the joint is welded, a cutting step of cutting the end of the obtained metal cylinder and removing the recessed portion becomes unnecessary. Since the cutting process is not required, post-processing of the cut surface such as deburring is not required. Further, there is no waste of material due to cutting. As a result, since the number of processing steps is small and the inlet pipe or the outlet pipe can be manufactured at a low cost, the present invention is extremely useful for reducing the cost of the exhaust gas treatment apparatus.

  In the present invention, a through hole is formed in the cylindrical body portion of the processing container, and the cap main body plate of the end cap, and a portion of the edge plate on the side of the cap main body plate from the through hole, It may be exposed outside the processing container. In this case, the outer peripheral edge of the through hole and the outer peripheral surface portion of the edge plate facing the through hole are welded and hermetically sealed, and the edge plate is located inside the processing container. The edge of the pipe is welded to a portion of the pipe outer peripheral surface at a plurality of locations in the circumferential direction.

  In this way, if only the edge plate portion on the cap body side of the end cap is exposed to the outside of the processing container, the end cap is attached to the open end of the pipe at a plurality of locations in the circumferential direction. It is easy and easy just by welding. In addition, by welding the edge plate portion of the end cap exposed to the outside of the processing container all around, the space between the through hole of the processing container and the pipe can be reliably sealed.

  In the present invention, a through hole is formed in the cylindrical body portion of the processing container, and the end cap and the part on the opening end side of the pipe are exposed to the outside of the processing container from the through hole. There may be. In this case, between the outer peripheral edge of the through hole and the portion of the pipe outer peripheral surface of the pipe facing the through hole, the entire circumference is welded and hermetically sealed, and the position located outside the processing vessel The edge of the edge plate is hermetically sealed by being welded to the outer peripheral surface of the pipe.

  In the present invention, the cylindrical body portion in which the through-hole is formed in the processing container includes a cylindrical body and an end plate that covers one cylindrical opening end of the cylindrical body, A metal plate having a predetermined width and length can be rolled into a cylindrical shape, and the joint of the metal plate can be welded. In this case, the end plate includes an end plate main body portion and an annular end plate edge portion that is bent from an outer peripheral edge of the end plate main body portion and extends in a direction toward the outer peripheral surface of the cylindrical body, A cylindrical outer peripheral surface portion continuous with the cylindrical opening end on the outer peripheral surface of the body is covered by the end plate edge portion of the end plate over the entire periphery thereof, and an edge of the end plate edge portion, Between the part of the outer peripheral surface of the cylindrical body facing to each other, the entire circumference is welded and hermetically sealed.

  An end plate provided with an end plate main body portion and an end plate edge portion is put on the open end of the cylinder used for the processing container. By attaching such a petri dish-shaped or flat cup-shaped end plate, it is possible to cover up a hollow due to welding generated at the opening end of the cylindrical body. Therefore, after the metal plate is bent and rounded into a cylindrical shape and the joint is welded, a cutting step of cutting the end of the obtained metal cylinder and removing the recessed portion becomes unnecessary. . Since the cutting process is not required, post-processing of the cut surface such as deburring is not required. Further, there is no waste of material due to cutting. As a result, since the number of processing steps is small and the processing container can be manufactured at a low cost, the present invention is extremely useful for reducing the cost of the exhaust gas processing apparatus.

  Here, a typical diesel engine exhaust gas treatment apparatus includes, as the pipe, an inlet pipe that introduces exhaust gas into the exhaust gas treatment part, and an outlet pipe that discharges exhaust gas after treatment from the exhaust gas treatment part. . On the one end side in the axial direction of the processing container, the inlet pipe is attached so as to penetrate the processing container in a direction orthogonal to the axial line. On the other end side in the axial direction of the processing container, the outlet pipe is attached so as to penetrate the processing container in a direction orthogonal to the axial line. In this case, the cylindrical part which comprises the edge part of the both sides in an inlet pipe, an outlet pipe, and a processing container can be set as the above-mentioned structure. Thereby, there is little waste of processing man-hours and materials, and the exhaust gas treatment device can be manufactured at a low price.

  In addition, the exhaust-gas-treatment part of the exhaust-gas processing apparatus of a diesel engine can be equipped with the oxidation catalyst for diesels, for example.

It is the side view and back view which show an example of the diesel engine by which the waste gas processing apparatus to which this invention is applied is mounted. FIG. 2 is a perspective view, a plan view, a bottom view, an end view on the exhaust gas inlet side, and an end view on the exhaust gas outlet side showing the exhaust gas treatment apparatus of FIG. 1. FIG. 2 is a plan view showing the treatment container of the exhaust gas treatment apparatus of FIG. 2, an end view on the exhaust gas inlet side, an end view on the exhaust gas outlet side, a longitudinal sectional view, a cross sectional view on the exhaust gas inlet side, and a cross sectional view on the exhaust gas outlet side is there. It is a partial expanded sectional view which shows a part of processing container of FIG. FIG. 2 is a plan view showing another example of the treatment container of the exhaust gas treatment apparatus, an end view on the exhaust gas inlet side, an end view on the exhaust gas outlet side, a longitudinal sectional view, a cross-sectional view on the exhaust gas inlet side, and a side view on the exhaust gas outlet side It is a cross-sectional view. It is the top view and longitudinal cross-sectional view which show the processing container of the conventional waste gas processing apparatus.

  Hereinafter, an exhaust gas treatment apparatus for a diesel engine according to an embodiment of the present invention will be described with reference to the drawings.

  FIGS. 1A and 1B are a side view and a rear view showing a diesel engine equipped with an exhaust gas treatment apparatus according to the present embodiment. The diesel engine 1 is, for example, a water-cooled vertical in-line four-cylinder engine. The engine body 2 includes a cylinder block 3, a cylinder head 4 attached to the upper end, an oil pan 5 attached to the lower end of the cylinder block 3, and the like. It is configured. Inside the cylinder block 3, four cylinders (not shown) are arranged along the longitudinal direction of the engine, which is the length direction thereof, and a crankshaft (not shown) is arranged below these cylinders. ing. An intake / exhaust valve (not shown) or the like is arranged inside the cylinder head 4 corresponding to each cylinder. A flywheel 6 fixed to the axial end portion of the crankshaft protruding outward is disposed on the rear end side of the cylinder block 3 in the longitudinal direction of the engine.

  A stay 7 standing upward is attached to the rear end of the cylinder block 3 in the longitudinal direction of the engine. A gantry 8 that extends substantially horizontally in the longitudinal direction of the engine is attached to the upper end portion of the stay 7. An exhaust gas treatment device 20 having a cylindrical shape as a whole is attached to the gantry 8 substantially horizontally in a state of facing the left-right direction of the engine.

  The exhaust gas treatment device 20 is inserted in the engine exhaust system, and purifies the exhaust gas discharged via the built-in exhaust gas treatment unit 22. The exhaust gas treatment apparatus 20 of this example includes a DOC (diesel oxidation catalyst) as a built-in exhaust gas treatment unit 22. In the engine exhaust system, the exhaust gas discharged from the combustion chamber of each cylinder is collected in the exhaust pipe 9 via the exhaust manifold and passed through the exhaust gas treatment device 20.

  The exhaust gas processing apparatus 20 includes a cylindrical processing container 21 in which an exhaust gas processing unit 22 is disposed. An inlet pipe 40 is attached to one end of the processing vessel 21, and an outlet pipe 50 is attached to the other end. A connecting flange 41 is attached to the tip of the inlet pipe 40. The inlet pipe 40 is connected to the exhaust pipe 9 via the flange 41, and the exhaust gas is introduced into the exhaust gas treatment unit (DOC) 22 in the processing vessel 21 via the inlet pipe 40.

  The exhaust gas after being processed through the exhaust gas processing unit (DOC) 22 is discharged from the outlet pipe 50. The outlet pipe 50 is connected to the tail pipe in a state where the outlet pipe 50 is inserted into the opening on the upstream end side of the tail pipe (not shown). The treated exhaust gas is purified from the outlet pipe 50 through a tail pipe and a muffler (not shown) inserted in the tail pipe, and then released into the atmosphere.

  2A to 2E are a perspective view showing the exhaust gas treatment device 20 taken out, a plan view when viewed from the direction of arrow b, a bottom view when viewed from the direction of arrow c, and an exhaust gas inlet, respectively. It is an end view of the side, and an end view of the exhaust gas outlet side.

  As described above, the exhaust gas processing apparatus 20 includes the processing vessel 21, the inlet pipe 40, and the outlet pipe 50. The end portion on the gas inlet side and the end portion on the gas outlet side of the processing container 21 are covered with a cup-shaped inlet side cover 23 and an outlet side cover 24, respectively. Each of the inlet side cover 23 and the outlet side cover 24 is a split type consisting of a pair of cover pieces 23a, 23b, 24a, 24b in the shape of halving the cup, and a plurality of fixing bolts 25, 26 is fixed to the processing container 21.

  The inlet pipe 40 is attached to the end portion on the exhaust gas inlet side of the cylindrical body portion of the processing vessel 21 so as to penetrate in the diameter direction. A front end opening 42 of the inlet pipe 40 protrudes by a predetermined amount through the inlet side cover 23, and a flange 41 for attachment to the exhaust pipe 9 is attached to the front end opening 42. As will be described later, an end cap 60 is put on the rear end opening of the inlet pipe 40. The end cap 60 is exposed to the outside through a circular opening 23 c formed in the inlet side cover 23.

  Similarly, the outlet pipe 50 is attached to the end on the exhaust gas outlet side of the cylindrical body of the processing vessel 21 so as to penetrate in the diameter direction. The front end opening 52 of the outlet pipe 50 penetrates the outlet side cover 24 and protrudes by a predetermined amount. An end cap 70 is put on the rear end opening of the outlet pipe 50 as described later. The end cap 70 is exposed to the outside through a circular opening 24 c formed in the outlet side cover 24.

  FIGS. 3A to 3F are a plan view showing the processing vessel 21 with the covers 23 and 24 removed, an end view on the exhaust gas inlet side, an end view on the exhaust gas outlet side, and a cut along line dd. They are the longitudinal cross-sectional view at the time of cut | disconnecting, the cross-sectional view by the side of the exhaust gas at the time of cut | disconnecting by an ee line, and the cross-sectional view by the side of the exhaust gas at the time of cut | disconnecting by the ff line.

  As shown in these drawings, the cylindrical body portion of the processing vessel 21 includes an inlet side cylindrical body 31 and an outlet side cylindrical body 32, and two intermediate cylindrical bodies 33 and 34 disposed coaxially therebetween. Yes. The end of the inlet side cylindrical body 31 is sealed in an airtight state by an end plate 35, and the end of the outlet side cylindrical body 32 is also sealed in an airtight state by an end plate 36. The intermediate cylindrical body 33 is coaxially fixed to the inlet side cylindrical body 31 by all-around welding, and the intermediate cylindrical body 34 is fixed coaxially to the outlet side cylindrical body 32 by all-around welding. Between the intermediate cylinders 33 and 34, a connecting cylinder 37 is arranged so as to cover the outer periphery thereof, and both ends of the connecting cylinder 37 are fixed to the intermediate cylinders 33 and 34 by all-around welding. Yes.

  The inside of the inlet side cylinder 31 is an exhaust gas inlet chamber 31A, and the inside of the intermediate cylinders 33 and 34 is an exhaust gas treatment part 22, for example, a DOC is supported on a catalyst support of a honeycomb structure. The inside of the outlet side cylindrical body 32 is an exhaust gas outlet chamber 32A.

  The inlet side cylindrical body 31 is formed with circular through holes 31a and 31b on both sides in the diameter direction, and the inlet pipe 40 is attached so as to pass through these holes. A large number of communication holes 43 are formed in a portion of the inlet pipe 40 that is inserted into the exhaust gas inlet chamber 31 </ b> A of the processing vessel 21. Similarly, circular through holes 32a and 32b are formed in the diametrically opposite side portions of the outlet side cylindrical body 32, and the outlet pipe 50 is attached so as to pass through these holes. A number of communication holes 53 are formed in a portion of the outlet pipe 50 that is inserted into the exhaust gas outlet chamber 32 </ b> A of the processing vessel 21.

  The exhaust gas introduced from the tip opening 42 of the inlet pipe 40 enters the exhaust gas inlet chamber 31A through the communication hole 43, and flows from here through the exhaust gas treatment unit 22 to the exhaust gas outlet chamber 32A. The exhaust pipe enters the outlet pipe 50 from the exhaust gas outlet chamber 32A through the communication hole 53 of the outlet pipe 50, and is discharged from the tip opening 52 of the outlet pipe 50 through the outlet pipe 50.

  A stay 27 for attaching the inlet side cover 23 is fixed to the center of the inlet side end plate 35 and the outer peripheral surface of the inlet side cylindrical body 31. Similarly, stays 28 for attaching the outlet side cover 24 are fixed to the outer peripheral surface of the outlet side cylindrical body 32 and the central portion of the outlet side end plate 36, respectively.

  FIG. 4 is a partially enlarged cross-sectional view showing a portion of the inlet pipe 40 taken out. With reference to FIG. 3 and FIG. 4, the structure and attachment structure of the inlet pipe 40 and the end cap 60 in the exhaust gas treatment apparatus 20 having the above configuration will be described in more detail. The inlet pipe 40 is a sheet metal pipe, which is manufactured by rounding a metal plate having a certain width and length into a cylindrical shape and welding a joint of the metal plate. The end cap 60 is made of a sheet metal having a shallow cup shape as a whole, and includes a disc-shaped cap body plate 61 and an annular edge plate 62 formed continuously on the outer peripheral edge of the cap body plate 61. ing. The annular edge plate 62 has an inner diameter that allows the rear end opening 44 of the inlet pipe 40 to be fitted therein, and is perpendicular to the direction from the outer peripheral edge of the cap body plate 61 toward the pipe outer peripheral surface 45 of the inlet pipe 40. It bends and extends. Therefore, the edge plate 62 of the end cap 60 covers the entire circumference of the pipe outer peripheral surface 45 on the rear end opening 44 side of the inlet pipe 40.

  Here, the end cap 60 that covers the rear end opening 44 of the inlet pipe 40 protrudes outward from the through hole 31 b of the inlet side cylindrical body 31 of the processing vessel 21. Specifically, the cap main body plate 61 in the end cap 60 and the portion of the edge plate 62 on the side continuous with the outer peripheral edge of the cap main body plate 61 protrude outward from the through hole 31b.

  A portion between the inner peripheral edge 31c on the outer peripheral surface side of the through hole 31b and the outer peripheral surface portion 63 of the edge plate 62 opposite to the inner peripheral surface 31 is an all-around welded portion 64, and the space between them is sealed in an airtight state. These are joined together. On the other hand, the edge 65 of the edge plate 62 located inside the inlet side cylindrical body 31 is joined to the portion of the pipe outer peripheral surface 45 facing this by the welded portion 66. For example, the pipe outer circumferential surface 45 is welded at four equiangular intervals in the circumferential direction of the edge 65. The end cap 60 is fixed to the rear end opening 44 of the inlet pipe 40 by the welded portion 66.

  On the other hand, in the inlet pipe 40, on the side of the other through hole 31a in the inlet side cylindrical body 31, a portion of the pipe outer peripheral surface 45 is joined to the inner peripheral edge 31d outside the through hole 31a by the all-around welded portion 67. . A space between the inlet pipe 40 and the inner peripheral surface of the through hole 31a is hermetically sealed by the all-around welded portion 67.

  In addition, in the front end opening portion 42 of the inlet pipe 40, the front end opening portion 42 is inserted into a circular through hole 41a formed at the center of the rectangular plate-shaped flange 41. In this state, the flange 41 is connected to the front end opening portion. 42 is fixed by welding.

  Next, the inlet side cylindrical body 31 and the end plate 35 of the processing container 21 will be described with reference to FIGS. 3 and 4. The inlet side cylindrical body 31 is manufactured by rounding a metal plate having a certain width and length into a cylindrical shape and welding a joint of the metal plate. The end plate 35 has a shallow petri dish shape as a whole, and an end plate main body portion 35a and an end plate edge portion 35b extending from the outer peripheral edge of the end plate main body portion 35a at a right angle toward the inlet side cylindrical body 31 side. And. The opening end of the entrance-side cylindrical body 31 is fitted into the end plate edge 35b, and the entire outer periphery of the opening end 31e is covered.

  The end plate edge portion 35b and the portion of the cylindrical outer peripheral surface 31f of the inlet side cylindrical body 31 facing the end plate edge portion 35b are joined by full circumference welding. By this all-around welded portion 38, the opening end 31e of the inlet side cylindrical body 31 is sealed in an airtight state.

  The other outlet pipe 50 and end cap 70 have the same configuration and mutual attachment structure as those of the inlet pipe 40 and end cap 60. Further, the configuration of the outlet side cylindrical body 32 and the outlet side end plate 36 and the mounting structure thereof are the same as those of the inlet side cylindrical body 31 and the inlet side end plate 35. Therefore, these descriptions are omitted.

(Other embodiments)
FIG. 5 shows another example of the attachment structure of the inlet pipe and the outlet pipe to the processing container in the exhaust gas processing apparatus 20. In these drawings, parts corresponding to the respective parts in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted. 5, (a) to (f) are a plan view showing the processing vessel 21 with the covers 23 and 24 removed, an end view on the exhaust gas inlet side, an end view on the exhaust gas outlet side, and a dd line, respectively. They are the longitudinal cross-sectional view at the time of cut | disconnecting by, the cross-sectional view by the side of the exhaust gas at the time of cut | disconnecting by ee line, and the cross-sectional view by the side of the exhaust gas at the time of cut | disconnecting by ff line.

  As shown in FIG. 5, the end cap 60A attached to the inlet pipe 40 is made of a sheet metal having a shallow petri dish as a whole, and is continuous with the disc-shaped cap body plate 61A and the outer periphery of the cap body plate 61A. And an annular edge plate 62A formed as described above. The annular edge plate 62A has an inner diameter capable of fitting the rear end opening 44 of the inlet pipe 40, and is perpendicular to the direction from the outer peripheral edge of the cap body plate 61A toward the pipe outer peripheral surface 45 of the inlet pipe 40. It bends and extends. Therefore, the edge plate 62A of the end cap 60A covers and covers the entire portion of the pipe outer peripheral surface 45 on the rear end opening 44 side of the inlet pipe 40.

  Here, the rear end opening 44 and the end cap 60 </ b> A of the inlet pipe 40 protrude outward from the through hole 31 b of the inlet side cylindrical body 31. The entire inner peripheral edge of the through hole 31b and the pipe outer peripheral surface 45 of the inlet pipe 40 facing the outer peripheral edge are made into a circumferential welded portion 64A, and these are sealed in an airtight state. Are joined. Similarly, the edge of the edge plate 62A is welded all around the portion of the pipe outer peripheral surface 45 that faces the edge. The entire circumference welded portion 66A is sealed in an airtight state.

  On the other hand, in the inlet pipe 40, on the side of the other through hole 31a in the inlet side cylindrical body 31, a portion of the pipe outer peripheral surface 45 is joined to the inner peripheral edge 31d outside the through hole 31a by the all-around welded portion 67. . A space between the inlet pipe 40 and the inner peripheral surface of the through hole 31a is hermetically sealed by the all-around welded portion 67.

  An end cap 70A having a similar structure is also provided on the other outlet pipe 50 side. Further, the outlet pipe 50 and the end cap 70A are welded in the same manner as the inlet pipe 40 and the end cap 60A.

DESCRIPTION OF SYMBOLS 1 Diesel engine, 2 engine main-body part, 3 cylinder block, 4 cylinder head, 5 oil pan, 6 flywheel, 7 stay, 8 mount, 9 exhaust pipe, 20 exhaust gas processing apparatus, 21 processing container, 22 exhaust gas processing part, 23 Inlet side cover, 23a, 23b Cover piece, 23c circular opening, 24 Outlet side cover, 24a, 24b Cover piece, 24c circular opening, 25, 26 bolt, 27, 28 stay, 31 Inlet side cylindrical body, 31a, 31b Through hole 31c inner peripheral edge, 31d inner peripheral edge, 31e open end, 31f cylindrical outer peripheral surface, 31A exhaust gas inlet chamber, 32 outlet side cylindrical body, 32a, 32b through hole, 32A exhaust gas outlet chamber, 33, 34 intermediate cylindrical body, 35 end Plate, 35a End plate body, 35b End plate edge 36 End plate, 37 Connection cylindrical body, 38 Fully welded part, 40 Inlet pipe, 41 Flange, 41a Circular through hole, 42 Tip opening, 43 communicating hole, 50 Outlet pipe, 52 Tip opening, 53 communicating hole, 60, 60A end cap, 61 cap body plate, 62, 62A edge plate, 63 outer peripheral surface portion, 64 full circumference welded portion, 65 edge end, 66 welded portion, 70 end cap

Claims (6)

It has a cylindrical processing container (21) with a built-in exhaust gas processing section (22),
A pipe (40) for introducing exhaust gas into the exhaust gas treatment part (22) or discharging exhaust gas after treatment from the exhaust gas treatment part is attached to the treatment container (21),
One open end (44) of the pipe (40) is covered with an end cap (60, 60A),
The pipe (40) is manufactured by rolling a metal plate having a predetermined width and length into a cylindrical shape and welding a joint of the metal plate,
The end cap (60, 60A) is bent from the outer peripheral edge of the cap body plate (61, 61A) and toward the outer peripheral surface (45) of the pipe (40). An annular edge plate (62, 62A) extending to
The pipe outer peripheral surface portion that is continuous with the open end (44) in the pipe outer peripheral surface (45) is entirely covered by the edge plate (62, 62A) of the end cap (60, 60A). And
An exhaust gas treatment device (20) for a diesel engine, wherein an edge of the edge plate (62, 62A) is welded to a portion of the pipe outer peripheral surface (45) facing the edge. A through hole (31b) is formed in the cylindrical body of the processing vessel (21),
The cap body plate (61) of the end cap (60) and the cap plate (61) side portion of the edge plate (62) are connected to the processing vessel (21) from the through hole (31b). ) Exposed outside
Between the outer inner peripheral edge (31c) of the through hole (31b) and the outer peripheral surface portion of the edge plate (62) opposite to the outer peripheral edge (31c), the entire periphery is welded and hermetically sealed,
The said edge of the said edge plate (62) located inside the said processing container (21) is welded to the site | part of the said pipe outer peripheral surface (45) in the several location in the circumferential direction. Exhaust gas treatment device (20) for diesel engines. A through hole (31b) is formed in the cylindrical body of the processing vessel (21),
The end cap (60A) and the part on the open end (44) side of the pipe (40) are exposed to the outside of the processing vessel (21) from the through hole (31b),
Between the outer inner peripheral edge (31c) of the through hole (31b) and the portion of the pipe outer peripheral surface (45) of the pipe (40) facing it, the entire circumference is welded and hermetically sealed,
2. The diesel engine according to claim 1, wherein the edge of the edge plate (62 </ b> A) located outside the processing container (21) is welded to the outer peripheral surface (45) of the pipe and hermetically sealed. Exhaust gas treatment device (20). The cylindrical body portion in which the through hole (31b) in the processing container (21) is formed is covered with the cylindrical body (31) and one cylindrical opening end (31e) of the cylindrical body (31). An end plate (35),
The cylindrical body (31) is manufactured by rolling a metal plate having a predetermined width and length into a cylindrical shape and welding a joint of the metal plate,
The end plate (35) has an end plate body portion (35a) and an annular end plate edge that is bent from the outer peripheral edge of the end plate body portion (35a) and extends in a direction toward the outer peripheral surface (31f) of the cylindrical body. Part (35b),
The cylindrical outer peripheral surface portion that is continuous with the cylindrical opening end (31e) in the cylindrical outer peripheral surface (31f) is covered with the end plate edge (35b) of the end plate (35) over the entire periphery. Hidden,
The space between the edge of the end plate edge (35b) and the portion of the outer peripheral surface of the cylindrical body (31f) facing the end plate is welded all around and hermetically sealed. Diesel engine exhaust gas treatment device (20). The pipe includes an inlet pipe (40) for introducing exhaust gas into the exhaust gas treatment part (22), and an outlet pipe (50) for discharging exhaust gas after treatment from the exhaust gas treatment part (22),
The inlet pipe (40) is attached in a state of passing through the processing container (21) in a direction orthogonal to the axial line on one end side in the axial direction of the processing container (21),
The outlet pipe (50) is attached on the other end side in the axial direction of the processing container (21) so as to penetrate the processing container (21) in a direction orthogonal to the axial line. The diesel engine exhaust gas treatment device (20) according to any one of 1 to 4.   The exhaust gas treatment device (20) for a diesel engine according to any one of claims 1 to 5, wherein the exhaust gas treatment unit (22) includes an oxidation catalyst for diesel.

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