JP2013155747A - Exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control device, in which a connection length can be reduced between a plurality of outer cases 5, 21 and the improvement in rigidity and weight reduction of the outer cases 5, 21 or the like can be achieved.SOLUTION: An exhaust emission control device includes: a plurality of gas purification bodies 2, 3 which purify an exhaust gas emitted by an engine 70; a plurality of inner cases 4, 20 which are internally provided with gas purification bodies 2, 3 respectively; and a plurality of outer cases 5, 21 which are internally provided with the inner case 4, 20 respectively. A length in a moving direction of the exhaust gas in each inner case 4 (20) is different from a length in a moving direction of the exhaust gas in each outer case 5 (21) storing each inner case 4 (20).

Description

  The present invention relates to an exhaust gas purification device that removes particulate matter (soot, particulates), NOx (nitrogen oxide), or the like contained in exhaust gas.

  Conventionally, in an exhaust gas purification device applied to a diesel engine or the like, a diesel particulate filter (or NOx catalyst) or the like is provided in an exhaust gas discharge path of a diesel engine mounted on a traveling machine body or the like, and exhausted from the diesel engine. There is a technique in which the exhaust gas thus purified is purified by a diesel particulate filter (or NOx catalyst) or the like (Patent Document 1, Patent Document 2, and Patent Document 3). Further, a technique in which a filter case (inner case) is provided in a casing (tubular body) and a particulate filter is disposed in the filter case is also known (see Patent Document 4).

JP 2000-145430 A Japanese Patent Laid-Open No. 2003-27922 JP 2008-82201 A JP 2001-173429 A

  When a filter case is directly mounted on a diesel engine in a structure in which a gas inlet pipe (inlet component) and support legs are provided in a filter case with a particulate filter, vibration and stress (deformation force) from the diesel engine Is added to the filter case. That is, there is a problem that the particulate filter (such as a holding mat covered with the filter) and the support leg are easily deformed and damaged by vibration and stress from the diesel engine. In addition, there is a problem that the particulate filter and the joint portion of the support leg are easily deformed and damaged due to distortion of the filter case due to welding of the support leg. Furthermore, in a structure including a plurality of filter cases (inner cases) each provided with a gas purifying body and a plurality of outer cases each provided with each filter case, each outer case is detachably connected by a flange, A flange is disposed on the mating surface (joint surface) of each gas purifier. That is, the end surface of the filter case such as a soot filter is flush with the end surface of the outer case, and the exposure range of the filter case from the outer case is small, so that disassembly and cleaning such as soot removal cannot be easily performed. There's a problem.

  An object of the present invention is to provide an exhaust gas purifying apparatus that can easily prevent the gas purifying body and the supporting leg from being deformed and damaged and can easily perform cleaning of the gas purifying body.

  In order to achieve the object, the invention according to claim 1 includes a plurality of gas purifying bodies for purifying exhaust gas discharged from an engine, a plurality of inner cases in which the gas purifying bodies are installed, and the inner cases. An exhaust gas purifying device having a plurality of outer cases in which the length of each inner case in the direction of movement of the exhaust gas and the direction of movement of the exhaust gas in the outer case that accommodates each of the inner cases are The length is different.

  According to a second aspect of the present invention, in the exhaust gas purifying apparatus according to the first aspect, the plurality of sets of outer cases are connected by a flange body, and in the connected state, the adjacent inner cases are separated and adjacent to each other. The flange body is offset with respect to the space between the inner cases, and the space between the adjacent inner cases is configured as a sensor mounting space.

  According to a third aspect of the present invention, in the exhaust gas purifying apparatus according to the first or second aspect, the inner case that accommodates one of the gas purifiers overlaps the outer case that accommodates the other gas purifier. It is what is constituted so that.

  According to the present invention, a plurality of gas purification bodies for purifying exhaust gas exhausted by the engine, a plurality of inner cases in which the gas purification bodies are installed, and a plurality of outer cases in which the inner cases are installed. An exhaust gas purifying apparatus having different lengths in the movement direction of the exhaust gas in the respective inner cases, and different lengths in the movement direction of the exhaust gas in the outer cases accommodating the respective inner cases, for example, When the plurality of sets of outer cases are connected by the flange body, the flange body can be offset with respect to the space between the adjacent inner cases. For this reason, it is possible to easily reduce the mounting interval of the plurality of gas purifying bodies, and to form the outer dimensions in the exhaust gas moving direction in a compact manner.

1 is a front sectional view of an exhaust gas purification device according to an embodiment of the present invention. It is the same external appearance bottom view. It is the left view seen from the exhaust gas inflow side. It is right side sectional drawing seen from the exhaust gas discharge side. FIG. 2 is an exploded front sectional view of FIG. 1. It is a front view expanded sectional view of the exhaust gas discharge side. It is a side view enlarged sectional view on the same exhaust gas discharge side. It is an enlarged bottom view of the same exhaust gas inflow side. It is an enlarged sectional view in plan view of the exhaust gas inflow side. FIG. 10 is an enlarged cross-sectional view in plan view of the exhaust gas inflow side showing a modification of FIG. 9. FIG. 10 is an enlarged cross-sectional view in plan view of the exhaust gas inflow side showing a modification of FIG. 9. FIG. 10 is an enlarged cross-sectional view in plan view of the exhaust gas inflow side showing a modification of FIG. 9. FIG. 10 is an enlarged cross-sectional view in plan view of the exhaust gas inflow side showing a modification of FIG. 9. FIG. 10 is an enlarged cross-sectional view in plan view of the exhaust gas inflow side showing a modification of FIG. 9. It is a left view of a diesel engine. It is a top view of a diesel engine. It is a front view of a diesel engine. It is a rear view of a diesel engine. It is a side view of a backhoe. It is a top view of a backhoe. It is a side view of a forklift car. It is a top view of a forklift car.

  DESCRIPTION OF EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. 1 is a front sectional view of the exhaust gas purification device, FIG. 2 is a bottom view of the same, FIG. 3 is a left side view of the exhaust gas inflow side, and FIG. 4 is a right side sectional view of the exhaust gas purification device. 5 is an exploded front sectional view of FIG. 1, FIG. 6 is an enlarged front sectional view of the exhaust gas discharge side, FIG. 7 is an enlarged sectional side view of the exhaust gas discharge side, and FIG. FIG. 9 is an enlarged sectional view of the exhaust gas inflow side in plan view. The overall structure of the exhaust gas purification apparatus will be described with reference to FIGS. 1 to 5. In the following description, the exhaust gas inflow side is simply referred to as the left side, and the exhaust gas discharge side is also simply referred to as the right side.

As shown in FIGS. 1 to 5, a continuously regenerating diesel particulate filter 1 (hereinafter referred to as DPF) is provided as an exhaust gas purifying apparatus of the present embodiment. The DPF 1 is for physically collecting particulate matter (PM) and the like in the exhaust gas. The DPF 1 includes a diesel oxidation catalyst 2 such as platinum that generates nitrogen dioxide (NO ₂ ), and a soot filter 3 having a honeycomb structure that continuously oxidizes and removes the collected particulate matter (PM) at a relatively low temperature. The exhaust gas is arranged in series in the moving direction of the exhaust gas (from the left side to the right side in FIG. 1). The DPF 1 is configured so that the soot filter 3 is continuously regenerated. The DPF 1 can reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas in addition to the removal of particulate matter (PM) in the exhaust gas.

  With reference to FIG.1 and FIG.5, the attachment structure of the diesel oxidation catalyst 2 is demonstrated. As shown in FIGS. 1 and 5, a diesel oxidation catalyst 2 as a gas purifier for purifying exhaust gas discharged from an engine is installed in a substantially cylindrical catalyst inner case 4 made of a heat-resistant metal material. The catalyst inner case 4 is provided in a substantially cylindrical catalyst outer case 5 made of a heat-resistant metal material. That is, the catalyst inner case 4 is fitted on the outside of the diesel oxidation catalyst 2 via the mat-shaped ceramic fiber catalyst heat insulating material 6. Further, the catalyst outer case 5 is fitted on the outer side of the catalyst inner case 4 via a thin plate support 7 having an I-shaped end face. Note that the diesel oxidation catalyst 2 is protected by the catalyst heat insulating material 6. The stress (deformation force) of the catalyst outer case 5 transmitted to the catalyst inner case 4 is reduced by the thin plate support 7.

  As shown in FIGS. 1 and 5, a disc-shaped left lid 8 is fixed to the left end of the catalyst inner case 4 and the catalyst outer case 5 by welding. A sensor connection plug 10 is fixed to the left lid body 8 through a seat plate body 9. The left end face 2a of the diesel oxidation catalyst 2 and the left lid 8 are opposed to each other with a predetermined distance L1 for gas inflow space. An exhaust gas inflow space 11 is formed between the left end face 2 a of the diesel oxidation catalyst 2 and the left lid 8. The sensor connection plug 10 is connected to an unillustrated inlet side exhaust gas pressure sensor, an inlet side exhaust gas temperature sensor, and the like.

As shown in FIGS. 1, 5, and 9, an elliptical exhaust gas inlet 12 is opened at the left end of the catalyst inner case 4 and the catalyst outer case 5 in which the exhaust gas inflow space 11 is formed. The elliptical exhaust gas inlet 12 has a short diameter in the exhaust gas movement direction (center line direction of the cases 4 and 5) and a direction orthogonal to the exhaust gas movement direction (circumferential direction of the cases 4 and 5). It has a long diameter. A closing ring body 15 is fixed between the opening edge 13 of the catalyst inner case 4 and the opening edge 14 of the catalyst outer case 5 in a sandwiched manner. A gap between the opening edge 13 of the catalyst inner case 4 and the opening edge 14 of the catalyst outer case 5 is closed by the closing ring body 15. An exhaust ring 15 prevents the exhaust gas from flowing between the catalyst inner case 4 and the catalyst outer case 5.

  As shown in FIGS. 1, 3, 5, and 8, an exhaust gas inlet pipe 16 is disposed on the outer surface of the catalyst outer case 5 in which the exhaust gas inlet 12 is formed. An exhaust connection flange body 17 is welded to a true circular opening end portion 16 a on the small diameter side of the exhaust gas inlet pipe 16. The exhaust connection flange body 17 is fastened to an exhaust manifold 71 of a diesel engine 70 described later via bolts 18. A large circular opening end 16 b on the large diameter side of the exhaust gas inlet pipe 16 is welded to the outer surface of the catalyst outer case 5. The exhaust gas inlet pipe 16 is formed in a divergent shape (a trumpet shape) from the small-diameter-side perfect circular opening end 16a toward the large-diameter-side perfect circular opening end 16b.

  As shown in FIGS. 1, 5, and 8, of the outer surface of the catalyst outer case 5, a large circular opening end 16 b is formed on the outer surface of the left end of the opening edge 14 of the catalyst outer case 5. The left end of is welded. That is, with respect to the elliptical exhaust gas inlet 12, the exhaust gas inlet pipe 16 (the large circular opening end 16b) is offset downstream of the exhaust gas movement (on the right side of the catalyst outer case 5). Are arranged. That is, the elliptical exhaust gas inlet 12 is offset to the exhaust gas moving upstream side (the left side of the catalyst outer case 5) with respect to the exhaust gas inlet pipe 16 (the large circular opening end 16b). The catalyst outer case 5 is formed.

With the configuration described above, the exhaust gas of the engine 70 enters the exhaust gas inlet pipe 16 from the exhaust manifold 71, enters the exhaust gas inflow space 11 from the exhaust gas inlet pipe 16 through the exhaust gas inlet 12, and the diesel oxidation catalyst 2. From the left end face 2a. Nitrogen dioxide (NO ₂ ) is generated by the oxidation action of the diesel oxidation catalyst 2. Further, as shown in FIGS. 2 to 4, support legs 19 are welded to the outer peripheral surface of the catalyst outer case 5. When the DPF 1 is assembled to the engine 70, the catalyst outer case 5 is fixed to the cylinder head 72 of the engine 70, which will be described later, via the support legs 19.

  With reference to FIG.1 and FIG.5, the attachment structure of the soot filter 3 is demonstrated. As shown in FIGS. 1 and 5, the soot filter 3 as a gas purifier that purifies exhaust gas discharged from the engine 70 is provided in a substantially cylindrical filter inner case 20 made of a heat-resistant metal material. The inner case 4 is provided in a substantially cylindrical filter outer case 21 made of a heat-resistant metal material. That is, the filter inner case 20 is fitted on the outside of the soot filter 3 via the mat-shaped ceramic fiber filter heat insulating material 22. The soot filter 3 is protected by the filter heat insulating material 22.

  As shown in FIGS. 1 and 5, the catalyst side flange 25 is welded to the exhaust gas movement downstream side (right side) of the catalyst outer case 5. The filter-side flange 26 is welded to the middle of the filter inner case 20 in the exhaust gas movement direction and the end of the filter outer case 21 on the upstream side (left side) of the exhaust gas movement. The catalyst side flange 25 and the filter side flange 26 are detachably fastened by bolts 27 and nuts 28. The diameter of the cylindrical catalyst inner case 4 and the diameter of the cylindrical filter inner case 20 are substantially the same. Further, the diameter of the cylindrical catalyst outer case 5 and the diameter of the cylindrical filter outer case 21 are substantially the same.

  As shown in FIG. 1, in a state where the filter outer case 21 is connected to the catalyst outer case 5 via the catalyst side flange 25 and the filter side flange 26, the exhaust gas movement downstream side (right side) end of the catalyst inner case 4 is shown. The end portion on the upstream side (left side) of the exhaust gas movement of the filter inner case 20 faces the portion spaced apart by a fixed interval L2 for sensor attachment. In other words, the sensor mounting space 29 is formed between the exhaust gas movement downstream side (right side) end of the catalyst inner case 4 and the exhaust gas movement upstream side (left side) end of the filter inner case 20. A sensor connection plug 50 is fixed to the catalyst outer case 5 at the sensor mounting space 29 position. The sensor connection plug 50 is connected to a filter inlet side exhaust gas pressure sensor (not shown), a filter inlet side exhaust gas temperature sensor (thermistor), and the like.

  As shown in FIG. 5, the cylindrical length L4 of the catalyst outer case 5 in the exhaust gas movement direction is longer than the cylindrical length L3 of the catalyst inner case 4 in the exhaust gas movement direction. The cylindrical length L6 of the filter outer case 21 in the exhaust gas movement direction is shorter than the cylindrical length L5 of the filter inner case 20 in the exhaust gas movement direction. A length (L2 + L3 + L5) obtained by adding the constant interval L2 of the sensor mounting space 29, the cylindrical length L3 of the catalyst inner case 4 and the cylindrical length L5 of the filter inner case 20 is the cylindrical length L4 of the catalyst outer case 5. And a length (L4 + L6) obtained by adding the cylindrical length L6 of the filter outer case 21 to be substantially equal to each other. The exhaust gas movement upstream side (left side) end of the filter outer case 21 and the exhaust gas movement upstream side (left side) end of the filter inner case 20 are only the difference in length (L7 = L5−L6). Protruding. That is, when the filter outer case 21 is connected to the catalyst outer case 5, the exhaust gas movement upstream side (left side) end of the filter inner case 20 is the overlap dimension L7, and the exhaust gas movement downstream side of the catalyst outer case 5 (Right side) is interpolated.

With the above configuration, nitrogen dioxide (NO ₂ ) generated by the oxidation action of the diesel oxidation catalyst 2 is supplied to the soot filter 3 from the left end face 3a. The collected particulate matter (PM) in the exhaust gas of the diesel engine 70 collected by the soot filter 3 is continuously oxidized and removed at a relatively low temperature by nitrogen dioxide (NO ₂ ). In addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 70, carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 70 are reduced.

As described above, the diesel oxidation catalyst 2 and the soot filter 3 are provided as gas purifiers that purify the exhaust gas discharged from the engine. However, instead of the diesel oxidation catalyst 2 and the soot filter 3, urea (reducing agent) NOx selective reduction catalyst (NOx removal catalyst) for reducing nitrogen oxides (NOx) in the exhaust gas of the engine 70 by ammonia (NH ₃ ) generated by the addition of), and residual ammonia discharged from the NOx selective reduction catalyst An ammonia removal catalyst that removes water may be provided.

As described above, when the NOx selective reduction catalyst (NOx removal catalyst) is provided in the catalyst inner case 4 and the ammonia removal catalyst is provided in the filter inner case 20 as the gas purifier, nitrogen oxidation in the exhaust gas exhausted by the engine is performed. The substance (NOx) is reduced and can be discharged as harmless nitrogen gas (N ₂ ).

  As shown in FIGS. 1 to 5, a diesel oxidation catalyst 2 and a soot filter 3 as a gas purifier for purifying exhaust gas discharged from a diesel engine 70, and a catalyst inner case in which the diesel oxidation catalyst 2 and the soot filter 3 are installed. 4, a filter inner case 20, and a catalyst outer case 5 and a filter outer case 21 in which the catalyst inner case 4 and the filter inner case 20 are installed. Are connected to the catalyst outer case 5 and the filter outer case 21, and an exhaust gas inlet pipe 16 as an inlet component to which an external stress is applied and a support leg 19 as a support body are arranged on the catalyst outer case 5. Yes.

  Therefore, external stress can be supported by the catalyst outer case 5, and external stress acting as a deformation force on the catalyst inner case 4 and the filter inner case 20 can be reduced. The double structure of the catalyst inner case 4 or the filter inner case 20 and the catalyst outer case 5 or the filter outer case 21 improves the heat insulating properties of the diesel oxidation catalyst 2 or the soot filter 3, thereby treating the diesel oxidation catalyst 2 or the soot filter 3. In addition to improving the capacity and the regeneration capacity, it is possible to easily prevent improper support of the diesel oxidation catalyst 2 and the soot filter 3 due to, for example, conduction of vibrations from the engine or distortion in welding processing.

  As shown in FIGS. 1 to 5, a plurality of sets of diesel oxidation catalysts 2 and soot filters 3, a catalyst inner case 4 and a filter inner case 20, and a catalyst outer case 5 and a filter outer case 21 are provided. The case 5 and the filter outer case 21 are connected by a catalyst side flange 25 and a filter side flange 26 as flange bodies. Accordingly, in consideration of the configuration of the exhaust gas inlet pipe 16 and the support leg 19 and the movement of exhaust gas between the plurality of sets of diesel oxidation catalyst 2 and the soot filter 3, a plurality of sets of catalyst inner cases 4 and filter inner cases are used. 20 and a plurality of sets of the catalyst outer case 5 and the filter outer case 21 can be functionally configured. The processing capacity, regeneration capacity, etc. of a plurality of sets of diesel oxidation catalysts 2 and soot filters 3 can be easily improved.

  As shown in FIGS. 1 to 5, the length of the catalyst inner case 4 and the filter inner case 20 in the exhaust gas moving direction is different from the length of the catalyst outer case 5 and the filter outer case 21 in the exhaust gas moving direction. Yes. Accordingly, the flange body connecting the catalyst outer case 5 and the filter outer case 21 can be offset with respect to the joining position of the plurality of sets of the diesel oxidation catalyst 2 and the soot filter 3. The mounting interval of the plurality of sets of diesel oxidation catalysts 2 and soot filters 3 can be easily reduced or expanded.

  As shown in FIGS. 1 to 5, a plurality of sets of diesel oxidation catalysts 2 and soot filters 3, a catalyst inner case 4 and a filter inner case 20, a catalyst outer case 5 and a filter outer case 21 are provided. The soot filter 3 is configured such that the catalyst side flange 25 and the filter side flange 26 connecting the plurality of sets of the catalyst outer case 5 and the filter outer case 21 are offset with respect to the joining position of the catalyst 2 and the soot filter 3. A catalyst outer case 5 facing the other diesel oxidation catalyst 2 is configured to overlap with the filter inner case 20 facing the other.

  Therefore, a sensor or the like can be easily disposed between the joints of the plurality of sets of diesel oxidation catalysts 2 and the soot filter 3 while the joint interval between the plurality of sets of diesel oxidation catalysts 2 and the soot filter 3 can be reduced. The lengths of the plurality of sets of catalyst outer cases 5 and filter outer cases 21 in the exhaust gas movement direction can be shortened to improve the rigidity and weight of the plurality of sets of catalyst outer cases 5 and filter outer cases 21 and the like. . By shortening the joining interval of the plurality of sets of diesel oxidation catalysts 2 and soot filters 3, the length of the plurality of sets of catalyst outer case 5 and filter outer case 21 in the exhaust gas moving direction can be shortened.

  The mounting structure of the silencer 30 will be described with reference to FIGS. 1 to 3 and FIGS. 5 to 7. As shown in FIGS. 1 to 3 and 5, a silencer 30 for attenuating exhaust gas noise discharged from an engine includes a substantially cylindrical silencer inner case 31 made of a refractory metal material and a substantially cylindrical shape made of a refractory metal material. The sound-absorbing outer case 32, and the sound-absorbing inner case 31 and the right-side end portion of the sound-absorbing outer case 32 are fixed to each other by welding. A silencer inner case 31 is provided in the silencer outer case 32. Further, the diameter of the cylindrical catalyst outer case 5, the diameter of the cylindrical filter outer case 21, and the cylindrical silencing outer case 32 are substantially the same. The diameter size of the cylindrical catalyst inner case 4, the diameter size of the cylindrical filter inner case 20, and the cylindrical sound deadening inner case 31 are substantially the same size. The diameter size of the cylindrical catalyst inner case 4, the diameter size of the cylindrical filter inner case 20, and the cylindrical silencer inner case 31 may not be the same size.

  As shown in FIGS. 4 to 7, the exhaust gas outlet pipe 34 is passed through the silencer inner case 31 and the silencer outer case 32. One end side of the exhaust gas outlet pipe 34 is closed by an outlet lid 35. A number of exhaust holes 36 are formed in the entire exhaust gas outlet pipe 34 inside the silencer inner case 31. The interior of the muffler inner case 31 is communicated with an exhaust gas outlet pipe 34 via a number of exhaust holes 36. A silencer and a tail pipe (not shown) are connected to the other end side of the exhaust gas outlet pipe 34.

  As shown in FIGS. 6 and 7, the muffler inner case 31 has a large number of muffler holes 37. The interior of the silencer inner case 31 is communicated between the silencer inner case 31 and the silencer outer case 32 via a number of silencer holes 37. The space between the silencer inner case 31 and the silencer outer case 32 is closed by the right lid 33 and the thin plate support 38. A ceramic fiber silencer 39 is filled between the silencer inner case 31 and the silencer outer case 32. The exhaust gas movement upstream (left side) end of the muffler inner case 31 is connected to the exhaust gas movement upstream (left side) end of the muffler outer case 32 via a thin plate support 38.

  With the above configuration, exhaust gas is discharged from the muffler inner case 31 through the exhaust gas outlet pipe 34. Further, in the silencer inner case 31, exhaust gas sounds (mainly high frequency band sounds) are absorbed into the silencer 39 from the numerous silencer holes 37. The noise of the exhaust gas discharged from the outlet side of the exhaust gas outlet pipe 34 is attenuated.

  As shown in FIGS. 1 and 5, the filter side outlet flange 40 is welded to the exhaust gas movement downstream side (right side) end of the filter inner case 20 and the filter outer case 21. The silencer flange 41 is welded to the exhaust gas movement upstream side (left side) of the silencer outer case 32. The filter side outlet flange 40 and the silencer side flange 41 are detachably fastened by bolts 42 and nuts 43. A sensor connection plug 44 is fixed to the filter inner case 20 and the filter outer case 21. The sensor connection plug 44 is connected to an unillustrated outlet side exhaust gas pressure sensor, an outlet side exhaust gas temperature sensor (thermistor) and the like.

  A modified structure of the exhaust gas inlet 12 will be described with reference to FIGS. 10 to 14. In the above embodiment, as shown in FIG. 9, the exhaust gas inlet 12 is formed by opening substantially elliptical through holes in the catalyst inner case 4 and the catalyst outer case 5. As shown in FIG. 10, the exhaust gas inlet 12 can be formed by opening substantially rectangular through holes in the catalyst inner case 4 and the catalyst outer case 5. Further, as shown in FIG. 11, the exhaust gas inlet 12 can be formed by opening a substantially oval through hole in the catalyst inner case 4 and the catalyst outer case 5. In addition, as shown in FIG. 12, the exhaust gas inlet 12 can be formed by opening substantially polygonal through holes in the catalyst inner case 4 and the catalyst outer case 5. Further, as shown in FIG. 13, the exhaust gas inlet 12 can be formed by opening substantially hexagonal through holes in the catalyst inner case 4 and the catalyst outer case 5. Further, as shown in FIG. 14, the exhaust gas inlet 12 can be formed by opening an indeterminate through hole in the catalyst inner case 4 and the catalyst outer case 5.

  With reference to FIG. 15 thru | or FIG. 18, the structure which provided the said DPF1 in the diesel engine 70 is demonstrated. As shown in FIGS. 15 to 18, an exhaust manifold 71 and an intake manifold 73 are arranged on the left and right side surfaces of the cylinder head 72 of the diesel engine 70. The cylinder head 72 is mounted on a cylinder block 75 having an engine output shaft 74 (crankshaft) and a piston (not shown). The front end and the rear end of the engine output shaft 74 are projected from the front and rear surfaces of the cylinder block 75. A cooling fan 76 is provided on the front surface of the cylinder block 75. The rotational force is transmitted from the front end side of the engine output shaft 74 to the cooling fan 76 via the V belt 77.

  Further, as shown in FIG. 18, a flywheel housing 78 is fixed to the rear surface of the cylinder block 75. A flywheel 79 is installed in the flywheel housing 78. A flywheel 79 is pivotally supported on the rear end side of the engine output shaft 74. The power of the diesel engine 70 is taken out via a flywheel 79 to operating parts such as a backhoe 100 and a forklift 120 described later. Further, as shown in FIG. 15, the support leg 19 is detachably fastened to the cylinder head 72 with a bolt 80. The DPF 1 described above is configured to be supported by the highly rigid cylinder head 72 via the support leg 19.

  A structure in which the diesel engine 70 is mounted on the backhoe 100 will be described with reference to FIGS. 19 and 20. As shown in FIGS. 19 and 20, the backhoe 100 includes a crawler-type traveling device 102 having a pair of left and right traveling crawlers 103, and a turning machine body 104 provided on the traveling device 102. The revolving machine body 104 is configured to be horizontally revolved over 360 ° in all directions by a revolving hydraulic motor (not shown). An earthwork plate 105 for ground work is mounted on the rear part of the traveling device 102 so as to be movable up and down. A steering unit 106 and a diesel engine 70 are mounted on the left side of the revolving machine body 104. A working unit 110 having a boom 111 and a bucket 113 for excavation work is provided on the right side of the revolving machine body 104.

  The control unit 106 is provided with a control seat 108 on which an operator is seated, operation means for operating the diesel engine 70 and the like, and a lever or switch as an operation means for the work unit 110. A boom cylinder 112 and a bucket cylinder 114 are arranged on a boom 111 which is a component of the working unit 110. A bucket 113 as an attachment for excavation is pivotally attached to the tip end portion of the boom 111 so as to be inserted and rotated. The boom cylinder 112 or the bucket cylinder 114 is operated to perform earthwork work (ground work such as grooving) by the bucket 113.

  A structure in which the diesel engine 70 is mounted on the forklift car 120 will be described with reference to FIGS. 21 and 22. As shown in FIGS. 21 and 22, the forklift car 120 includes a traveling machine body 124 having a pair of left and right front wheels 122 and a rear wheel 123. The traveling body 124 is equipped with a control unit 125 and a diesel engine 70. A working portion 127 having a fork 126 for cargo handling work is provided on the front side portion of the traveling machine body 124. In the control unit 125, a control seat 128 on which an operator is seated, a control handle 129, an operation means for operating the diesel engine 70 and the like, a lever or a switch as an operation means for the working unit 127, and the like are disposed. .

  A fork 126 is arranged on the mast 130 that is a component of the working unit 127 so as to be movable up and down. The fork 126 is moved up and down, a pallet (not shown) loaded with a load is placed on the fork 126, the traveling machine body 124 is moved forward and backward, and a cargo handling operation such as transportation of the pallet is performed. Yes.

2 Diesel oxidation catalyst (gas purifier)
3 Soot filter (gas purifier)
4 Catalyst inner case 5 Catalyst outer case 16 Exhaust gas inlet pipe (inlet component)
19 Support leg (support)
20 Filter inner case 21 Filter outer case 25 Catalyst side flange (flange body)
26 Filter side flange (flange body)

Claims (3)

An exhaust gas purifying apparatus having a plurality of gas purifying bodies for purifying exhaust gas discharged from the engine, a plurality of inner cases in which the gas purifying bodies are installed, and a plurality of outer cases in which the inner cases are installed. Because
The length in the movement direction of the exhaust gas of each inner case is different from the length in the movement direction of the exhaust gas of the outer case that accommodates each inner case.
Exhaust gas purification device. The plurality of sets of outer cases are connected by a flange body, and in the connected state, the adjacent inner cases are separated from each other, the flange bodies are offset with respect to the space between the adjacent inner cases, and are adjacent to each other. The space between the inner cases is configured as a sensor mounting space.
The exhaust gas purification apparatus according to claim 1. The inner case that houses one of the gas purification bodies is configured to overlap the outer case that houses the other gas purification body,
The exhaust gas purification device according to claim 1 or 2.

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