JP2014221638A - Exhaust emission control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control system which enables the assembly workability or the maintenance workability of gas purification bodies 2, 3 or exhaust gas purification cases 4, 5, 20, 21 etc. to be improved.SOLUTION: An exhaust emission control system of the invention includes: gas purification bodies 2,3 which purify an exhaust gas exhausted from an engine 70; a gas purification housing 60 in which the gas purification bodies 2, 3 are internally arranged; and a support bracket 62 which supports the gas purification housing 60. A bolt hole 87a is formed at the support bracket 62, and an insertion guide 89 is formed at the support bracket 62. The exhaust emission control system is formed so that an attachment bolt 87 is engaged with or disengaged from the bolt hole 87a through the insertion guide 89.

Description

  The present invention relates to an exhaust gas purification device mounted on a diesel engine or the like, and more particularly to an exhaust gas purification device that removes particulate matter (soot, particulates) and the like contained in exhaust gas. .

  Conventionally, a diesel particulate filter (hereinafter referred to as DPF) is provided as an exhaust gas purification device (post-treatment device) in the exhaust path of the diesel engine, and exhausted from the diesel engine by a DPF oxidation catalyst or a soot filter or the like. A technique for purifying exhaust gas is known (see, for example, Patent Documents 1 and 2).

  In addition, a technique for providing a temperature sensor for detecting the temperature of exhaust gas discharged from a diesel engine and a pressure sensor for detecting the pressure of exhaust gas discharged from a diesel engine in the DPF is also known (see, for example, Patent Document 2). ).

  Further, in the DPF, a technique is known in which an inner case is provided in a double structure inside an outer case, and an oxidation catalyst or a soot filter is provided in the inner case (see, for example, Patent Document 3).

  Further, in the DPF, a technique is also known in which a case in which an oxidation catalyst is placed and a case in which a soot filter is placed are detachably connected via a flange fastened by a bolt (see, for example, Patent Documents 4 to 5). .

JP 2004-263593 A JP 2001-73748 A JP 2005-194949 A JP 2009-228516 A JP 2009-91982 A

  In the prior art, when assembling the DPF on the engine or body side, one operator lifts the DPF with both hands and supports it in a predetermined posture, and the other operator tightens the mounting bolt, Therefore, there is a problem that the number of assembly steps of the DPF cannot be reduced.

  On the other hand, by lifting the DPF using a lifting machine such as a chain block, one worker was able to fasten the mounting bolt and fix the DPF to the engine or the machine body side. Limited to work at the place where it was installed. DPF attachment / detachment work time cannot be easily reduced. That is, there is a problem that the assembly workability or maintenance workability of the DPF cannot be improved.

  Accordingly, the present invention seeks to provide an exhaust gas purifying device that has been improved by examining these current conditions.

An exhaust gas purification apparatus of the present invention is an exhaust gas purification apparatus comprising a gas purification body for purifying exhaust gas discharged from an engine, and a gas purification housing in which the gas purification body is installed.
A structure including a support bracket for supporting the gas purification housing, wherein a bolt hole is formed in the support bracket, an insertion guide is formed by a notch for bolt insertion formed in the support bracket, and the support bracket is connected. The mounting bolt provided at the mounting site is configured to be engaged with and disengaged from the bolt hole via the insertion guide.

  In such an exhaust gas purification device, an outer case body is fitted outside an exhaust gas purification case in which the gas purification body is installed, and the gas purification housing is formed by the exhaust gas purification case and the outer case body. The support bracket is integrally fixed to the outer case body, and the bolt hole is opened to the side edge of the support bracket through the bolt insertion notch, and from the engine. An exhaust gas inlet pipe for allowing the exhaust gas to flow into the gas purification housing, and a direction in which the mounting bolt is engaged and disengaged with respect to the insertion guide is an exhaust gas moving direction when moving from the engine to the exhaust gas inlet pipe The direction may be substantially the same.

  In addition, the direction in which the mounting bolt is engaged with and disengaged from the insertion guide is parallel to the exhaust gas moving direction when the engine is directed to the exhaust gas inlet pipe, and the mounting bolt is inserted through the bolt insertion notch. The gas purification housing may be configured to be able to engage with the bolt hole and support the gas purification housing via the mounting bolt. Further, an inlet flange body that is bolted to the exhaust side of the engine is provided at an exhaust gas inlet side opening end portion of the exhaust gas inlet pipe, and a bolt insertion direction for fastening the inlet flange body to the exhaust side of the engine May be parallel to the direction of engagement / disengagement with respect to the insertion guide of the mounting bolt.

  In the exhaust gas purification apparatus, the gas purification body includes a plurality of sets of the gas purification body, the exhaust gas purification case, and the outer case body, and the plurality of outer case bodies are connected to a connection boundary position of the plurality of the gas purification bodies. The support bracket may be integrally fixed to at least one of the plurality of outer case bodies while the flange body for connection is offset.

  In the exhaust gas purification apparatus, the gas purification body includes a plurality of sets of the gas purification body, the exhaust gas purification case, and the outer case body, and the plurality of outer case bodies are connected to a connection boundary position of the plurality of the gas purification bodies. While the flange body for connection is offset, the support bracket on which the insertion guide is formed is fixed to the outer case body on the side where the dimension in the exhaust gas movement direction is long among the plurality of outer case bodies. You may comprise.

  In the exhaust gas purification apparatus, the gas purification body includes a plurality of sets of the gas purification body, the exhaust gas purification case, and the outer case body, and the plurality of outer case bodies are connected to a connection boundary position of the plurality of the gas purification bodies. While the flange body for connection is offset, the support bracket on which the insertion guide is formed is fixed to an outer case body provided with an exhaust gas inlet pipe among the plurality of outer case bodies. May be.

  According to the present invention, after the mounting bolt for temporary fixing is mounted in a semi-fixed state on the engine-side or machine-side mounting site to which the support bracket is connected, the mounting bolt is inserted into the mounting bolt via the insertion guide. A bolt hole can be engaged, and the gas purification housing can be supported at the attachment site. In other words, the operator can fasten the support bracket by tightening the mounting bolt for retrofitting while releasing the hand from the gas purification housing. The gas purification housing can be attached and detached by a single operator. Assembling workability of the gas purification housing which is a heavy object can be improved.

  According to the present invention, the bolt hole can be engaged with the mounting bolt temporarily fixed in the semi-fixed state via the bolt insertion notch. In other words, the operator can fasten the support bracket by tightening the mounting bolt for retrofitting while releasing the hand from the gas purification housing. The gas purification housing can be attached and detached by a single operator. Assembling workability of the gas purification housing which is a heavy object can be improved.

  According to the present invention, an outer case body is fitted outside an exhaust gas purification case in which the gas purification body is installed, and a gas purification housing is formed by the exhaust gas purification case and the outer case body. Since the support bracket is integrally fixed to the body, the outer case body can easily keep the exhaust gas purification case warm and improve the rigidity of the gas purification housing. .

  According to the present invention, a plurality of sets of the gas purification body, the exhaust gas purification case, and the outer case body are provided, and the plurality of outer case bodies are coupled to connection boundary positions of the plurality of the gas purification bodies. Disassembling and assembling the gas purifying body and the exhaust gas purifying case by offsetting the flange body for fixing the support bracket to the at least one of the plurality of outer case bodies. Work can be simplified. While it is possible to improve maintenance workability such as soot clogging removal of the gas purification body, the flange body can easily prevent exhaust gas leakage and the like.

  According to the present invention, a plurality of sets of the gas purification body, the exhaust gas purification case, and the outer case body are provided, and the plurality of outer case bodies are coupled to connection boundary positions of the plurality of the gas purification bodies. The support bracket on which the insertion guide is formed is fixed to the outer case body on the side where the dimension in the exhaust gas movement direction is long among the plurality of outer case bodies. By constituting in this way, it is possible to simplify the disassembling and assembling work of the gas purification body and the exhaust gas purification case. While it is possible to improve maintenance workability such as soot clogging removal of the gas purification body, the flange body can easily prevent exhaust gas leakage and the like. Further, the support bracket on which the insertion guide is formed can be assembled with high rigidity using the outer case body formed in a long shape.

  According to the present invention, a plurality of sets of the gas purification body, the exhaust gas purification case, and the outer case body are provided, and the plurality of outer case bodies are coupled to connection boundary positions of the plurality of the gas purification bodies. A flange body for offsetting, while the support bracket formed with the insertion guide is fixed to an outer case body provided with an exhaust gas inlet pipe among the plurality of outer case bodies By doing so, the disassembly and assembly work of the gas purification body and the exhaust gas purification case can be simplified. While it is possible to improve maintenance workability such as soot clogging removal of the gas purification body, the flange body can easily prevent exhaust gas leakage and the like. In addition, the support bracket on which the insertion guide is formed and the exhaust gas inlet pipe can be assembled with high rigidity using the outer case body formed in a long shape.

It is a section explanatory view of DPF which shows a 1st embodiment. It is an external appearance perspective view of DPF. It is an external appearance top view of DPF. It is an external appearance bottom view of DPF. It is an external appearance front view of DPF. It is an external appearance side view of DPF. It is a cross-sectional side view of the upstream of DPF. It is a cross-sectional side view of the downstream of DPF. It is decomposition | disassembly cross-section explanatory drawing of DPF. It is a separation side view of a clamping flange (semi-arc body). It is an expanded side sectional view of a catalyst side joining flange. It is an expanded sectional view which shows the attachment part of the sensor boss body for temperature sensors. It is a top view of the diesel engine which provided DPF. It is a rear view of the diesel engine which provided DPF. It is a left view of the diesel engine which provided DPF. It is a right view of the diesel engine which provided DPF. It is a rear perspective view of a diesel engine provided with a DPF. It is a top perspective view of a diesel engine provided with a DPF. It is the elements on larger scale of FIG. FIG. 20 is an assembly (disassembly) explanatory diagram of FIG. 19. It is principal part cross-sectional explanatory drawing of FIG.

  A first embodiment of an exhaust gas purifying apparatus embodying the present invention will be described below with reference to FIGS. 1 to 13. A continuously regenerating diesel particulate filter 1 (hereinafter referred to as DPF 1) as an exhaust gas purification device is provided. In addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 70, the DPF 1 is configured to reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 70. Yes.

  As shown in FIGS. 1, 6, and 13, the DPF 1 as an exhaust gas purification device is for collecting particulate matter (PM) and the like in the exhaust gas. The DPF 1 is configured in a substantially cylindrical shape extending long in the left-right direction intersecting the output shaft (crankshaft) of the diesel engine 70 in plan view. The DPF 1 is disposed on the flywheel housing 78 of the diesel engine 70. An exhaust gas inlet pipe 16 (exhaust gas intake side) and an exhaust gas outlet pipe 34 (exhaust gas discharge side) are provided on the left and right sides of the DPF 1 (one end side and the other end side in the exhaust gas movement direction). It distributes to the left and right. The exhaust gas inlet pipe 16 on the exhaust gas intake side of the DPF 1 is detachably bolted to the exhaust manifold 71 of the diesel engine 70. A tail pipe 107 is connected to the exhaust gas outlet pipe 34 on the exhaust gas discharge side of the DPF 1.

  As shown in FIGS. 1 to 6, a DPF 1 includes a DPF casing 60 made of a heat-resistant metal material and a diesel oxidation catalyst 2 such as platinum and a soot filter 3 having a honeycomb structure through a cylindrical inner case 4 or 20. It is a structure accommodated in series. The DPF 1 is attached to the flywheel housing 78 via a flange side bracket leg 61 and a casing side bracket leg 62 as a support. In this case, one end side of the flange-side bracket leg 61 is detachably bolted to the outer peripheral side of the DPF casing 60 via a flange 40 described later. One end side of the casing side bracket leg 62 is integrally fixed to the outer peripheral surface of the DPF casing 60 by welding.

  On the other hand, as shown in FIGS. 1 to 6, 13, and 18 to 21, the other end of the flange side bracket leg 61 is attached to the DPF mounting portion 80 on the top surface of the flywheel housing 78 by two retrofitting bolts 88. Fastened detachably. That is, the bolt through hole 88a is opened in the flange side bracket leg 61. A screw hole 88b is opened upward in the DPF attachment portion 80. The flange-side bracket leg 61 is placed on the flat upper surface of the DPF attachment portion 80, the retrofitting bolt 88 is fastened to the screw hole 88b via the bolt through hole 88a, and the flange-side bracket leg 61 is connected to the upper surface of the flywheel housing 78. The DPF 1 is configured to be detachably fixed.

  Further, the other end side of the casing side bracket leg 62 is detachably fastened to the upper surface (DPF attachment portion) of the flywheel housing 78 with a front bolt 87 and a rear bolt 88. That is, the bolt through holes 87 a and 88 a are opened in the casing side bracket leg 62. A screw hole 87b is opened upward in the DPF attachment portion 80. The flange side bracket leg 61 is placed on the flat upper surface of the DPF mounting portion 80, the front bolt 87 and the rear bolt 88 are fastened to the screw hole 87b via the bolt through holes 87a and 88a, and the casing side bracket is mounted on the upper surface of the flywheel housing 78. The DPF 1 is configured to be detachably fixed via the legs 62.

  Further, as shown in FIGS. 19 to 21, a notch groove 89 for engaging the front bolt 87 in the bolt through hole 87 a is formed on the other end side of the casing side bracket leg 62. When the DPF 1 is assembled to the diesel engine 70, the notch groove 89 is opened at the front end edge of the casing side bracket leg 62 so that the opening of the notch groove 89 is positioned at the head. In addition, the open edge part of the notch groove 89 is formed in the taper of the divergent form (protruding form).

  With the above configuration, as shown in FIG. 21, when the DPF 1 is assembled to the diesel engine 70, first, the leading bolt 87 is incompletely screwed into the DPF mounting portion 80 on the upper surface of the flywheel housing 78 through the screw hole 87b. . In the state where the head of the front bolt 87 is separated from the upper surface of the DPF mounting portion 80 by the thickness of the casing side bracket leg 62 or more, the front bolt 87 is supported by the DPF mounting portion 80. Then, the operator lifts the DPF 1 with both hands, locks the screw hole 87 b of the casing side bracket leg 62 through the notch groove 89 to the head of the tip bolt 87, and temporarily fixes the DPF 1 to the upper surface of the flywheel housing 78. To do. In this state, the operator can release both hands from the DPF 1.

  Thereafter, the flange side bracket leg 61 and the casing side bracket leg 62 are fastened to the DPF attachment portion 80 on the upper surface of the flywheel housing 78 by three retrofitting bolts 88. On the other hand, the inlet flange body 17 is fastened to the exhaust manifold 71 via the embedded bolt 17a and the inlet flange nut 17b, and the exhaust gas inlet pipe 16 is fixed to the exhaust manifold 71. Note that when the tool escape notch 62a is formed on the upper edge side of the casing side bracket leg 62 and the inlet flange nut 17b is tightened, the wrench (tightening tool) abuts on the upper edge side of the casing side bracket leg 62. This can be prevented by the tool escape notch 62a.

  Next, the front bolt 87 is completely fastened to the DPF mounting portion 80 on the upper surface of the flywheel housing 78, and the DPF 1 is detachably fixed to the exhaust gas outlet side of the exhaust manifold 71 and the upper surface of the flywheel housing 78. The operation for assembling the DPF1 is completed. In addition, since the bolt through hole 87a for inserting the bolt is opened on the front side edge of the casing side bracket leg 62 through the notch groove 89 on the front side in the attaching / detaching direction of the DPF casing 60, the leading bolt 87 is incompletely fastened. With the DPF casing 60 lifted with both hands in a state of being temporarily fixed in a (semi-fixed) posture, and moved to the attachment site of the diesel engine 70 (or this machine), that is, the upper surface of the flywheel housing 78, the front bolt 87 The bolt through-hole 87a can be engaged through the notch groove 89.

  That is, the operator can fasten the flange-side bracket leg 61 and the casing-side bracket leg 62 by tightening the retrofit bolt 88 (bolt) in a state where the hand is released from the DPF casing 60. The DPF 1 can be removed in the reverse procedure. As a result, the DPF 1 (DPF casing 60) can be stably connected and supported to the rear portion of the diesel engine 70 at the upper portion of the flywheel housing 78, which is a highly rigid member, by the bracket legs 61 and 62 and the exhaust manifold 71. Moreover, the attachment or detachment operation | work of DPF1 to the diesel engine 70 can be performed by one operator.

  With the above configuration, the exhaust gas of the diesel engine 70 flows from the exhaust manifold 71 of the diesel engine 70 to the diesel oxidation catalyst 2 side in the DPF casing 60, and moves from the diesel oxidation catalyst 2 to the soot filter 3 side for purification. It is processed. Particulate matter in the exhaust gas cannot pass through the porous partition walls between the cells in the soot filter 3. That is, the particulate matter in the exhaust gas is collected by the soot filter 3. Thereafter, exhaust gas that has passed through the diesel oxidation catalyst 2 and the soot filter 3 is discharged to the tail pipe 107.

  When the exhaust gas passes through the diesel oxidation catalyst 2 and the soot filter 3, the exhaust gas temperature exceeds the reproducible temperature (for example, about 300 ° C.). NO (nitrogen monoxide) is oxidized to unstable NO2 (nitrogen dioxide). The particulate matter collected by the soot filter 3 is oxidized and removed by O (oxygen) released when NO2 returns to NO. In addition, when particulate matter accumulates on the soot filter 3, the particulate matter is oxidized and removed by maintaining the temperature of the exhaust gas at a temperature higher than the regenerative temperature. Is recovered (the soot filter 3 is regenerated).

  With reference to FIG.1 and FIG.9, the structure which assembles | assembles the diesel oxidation catalyst 2 which is an example of the exhaust-gas purification body (filter) which purifies the exhaust gas which the diesel engine 70 discharged | emitted is demonstrated. The diesel oxidation catalyst 2 is provided in a substantially cylindrical catalyst inner case 4 made of a heat-resistant metal material. The catalyst inner case 4 is formed 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 ceramic heat insulating material 6 made of ceramic fiber. A catalyst heat insulating material 6 is press-fitted between the diesel oxidation catalyst 2 and the catalyst inner case 4 to protect the diesel oxidation catalyst 2.

  Further, the catalyst outer case 5 is fitted on the outer side of the catalyst inner case 4 via an end plate L-shaped support 7. The catalyst outer case 5 is one of the elements that constitute the DPF casing 60 described above. Note that the diesel oxidation catalyst 2 is protected by the catalyst heat insulating material 6. The stress (mechanical vibration, 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 9, a disk-like side lid 8 is fixed to one end of the catalyst inner case 4 and the catalyst outer case 5 by welding. An outer lid body 9 is fastened to the outer surface side of the side lid body 8 with bolts and nuts. The gas inflow side end face 2a of the diesel oxidation catalyst 2 and the side lid 8 are separated by a certain distance L1 (gas inflow space 11). An exhaust gas inflow space 11 is formed between the gas inflow side end face 2 a of the diesel oxidation catalyst 2 and the left lid 8. An exhaust gas inlet 12 facing the exhaust gas inflow space 11 is opened in the catalyst inner case 4 and the catalyst outer case 5. A closing ring body 15 is fixed between the opening edge of the catalyst inner case 4 and the opening edge of the catalyst outer case 5 in a sandwiched manner. Since the gap between the opening edge of the catalyst inner case 4 and the opening edge of the catalyst outer case 5 is closed by the closing ring 15, the exhaust gas flows between the catalyst inner case 4 and the catalyst outer case 5. Can be prevented.

  As shown in FIGS. 1 to 6 and 9, 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 inlet flange body 17 is welded and fixed to one open end of the exhaust gas inlet pipe 16. The inlet flange body 17 is detachably bolted to the exhaust manifold 71 of the diesel engine 70. One end of the exhaust gas inlet pipe 16 communicates with the exhaust manifold 71. The other open end of the exhaust gas inlet pipe 16 is welded to the outer surface of the catalyst outer case 5 so as to cover the exhaust gas inlet 12 from the outside. A pair of reinforcing bracket bodies 18 are fixed by welding between the outer surface of the catalyst outer case 5 and the side edges of the inlet flange body 17 to ensure the connection strength between the exhaust manifold 71 and the exhaust gas inlet pipe 16.

  With the above configuration, the exhaust gas of the diesel engine 70 enters the exhaust gas inlet pipe 16 from the exhaust manifold 71 and 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 is supplied from the gas inflow side end surface 2a on the left side. Nitrogen dioxide (NO 2) is generated by the oxidation action of the diesel oxidation catalyst 2.

  With reference to FIG.1 and FIG.9, the structure which assembles the soot filter 3 which is an example of the exhaust-gas purification body (filter) which purifies the exhaust gas which the diesel engine 70 discharged | emitted is demonstrated. The soot filter 3 is provided in a substantially cylindrical filter inner case 20 made of a heat-resistant metal material. The filter inner case 20 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 through the mat-shaped filter heat insulating material 22 made of ceramic fiber. The filter outer case 21 is one of the elements constituting the DPF casing 60 described above together with the catalyst outer case 5. In addition, the filter heat insulating material 22 is press-fitted between the soot filter 3 and the filter inner case 20 to protect the soot filter 3.

  As shown in FIGS. 1 and 9, the catalyst inner case 4 formed in a cylindrical shape with a straight ridge line is a downstream side into which an upstream side cylinder portion 4 a for accommodating the diesel oxidation catalyst 2 and a filter inner case 20 described later are inserted. It is comprised by the side cylinder part 4b. In addition, the upstream side cylinder part 4a and the downstream side cylinder part 4b are cylinders of substantially the same diameter. Furthermore, a thin plate-shaped ring-shaped catalyst side joining flange 25 that is welded and fixed to the outer periphery of the catalyst inner case 4 and a thin plate-shaped ring-shaped filter side joint flange 26 that is welded and fixed to the outer periphery of the filter inner case 20 are provided. The catalyst-side joining flange 25 and the filter-side joining flange 26 are formed in a donut shape having an L-shaped cross section.

  The inner peripheral side of the L-shaped cross-section end face of the catalyst side joining flange 25 is welded and fixed to the end portion of the downstream side cylinder portion 4 b of the catalyst inner case 4. The outer peripheral side of the L-shaped cross-section end face of the catalyst side joining flange 25 is projected toward the outer peripheral side (radial direction) of the catalyst outer case 5. A step portion 25 a is formed at the bent corner portion of the L-shaped end face of the catalyst side joining flange 25. The downstream end of the catalyst outer case 5 is fixed by welding to the step portion 25a.

  On the other hand, the inner peripheral side of the L-shaped cross-section end face of the filter side joining flange 26 is welded and fixed to the middle part of the outer periphery of the filter inner case 20 in the exhaust gas movement direction. The outer peripheral side of the L-shaped cross-section end face of the filter-side joining flange 26 is projected toward the outer peripheral side (radial direction) of the filter outer case 21. A step portion 26 a is formed at the bent corner of the L-shaped end face of the filter-side joining flange 26. The upstream end of the filter outer case 21 is fixed by welding to the step portion 26a. In addition, the filter inner case 20 is formed in a cylindrical shape whose ridgeline is a straight line. The exhaust gas upstream end and the downstream end of the filter inner case 20 are cylinders having substantially the same diameter.

  Further, the outer diameter of the diesel oxidation catalyst 2 and the outer diameter of the soot filter 3 are formed to be equal. Compared with the thickness of the filter heat insulating material 22, the thickness of the catalyst heat insulating material 6 is formed larger. On the other hand, the catalyst inner case 4 and the filter inner case 20 are formed of the same plate thickness material. The outer diameter of the filter inner case 20 is made smaller than the inner diameter of the downstream cylindrical portion 4 b of the catalyst inner case 4. A downstream gap 23 is formed between the inner peripheral surface of the catalyst inner case 4 and the outer peripheral surface of the filter inner case 20. The downstream gap 23 is formed to have a dimension (for example, 2 millimeters) larger than the thickness (for example, 1, 5 millimeters) of each of the cases 4 and 20. For example, even if the cases 4 and 20 are rusted or thermally deformed, the exhaust gas upstream end of the filter inner case 20 can be easily put in and out of the downstream cylindrical portion 4 b of the catalyst inner case 4.

  As shown in FIGS. 1 to 5, 9, and 12, the catalyst-side joining flange 25 and the filter-side joining flange 26 are abutted with each other through the gasket 24. The joint flanges 25 and 26 are sandwiched from both sides in the exhaust gas movement direction by a pair of thick plate-like central clamping flanges 51 and 52 surrounding the outer peripheral sides of the outer cases 5 and 21. The catalyst outer case 5 and the filter outer case 21 are detachably connected by fastening the center clamping flanges 51 and 52 with the bolts 27 and the nuts 28 and clamping the joining flanges 25 and 26.

  As shown in FIGS. 1 and 12, the upstream end of the filter outer case 21 is connected to the downstream end of the catalyst outer case 5 through the center clamping flanges 51 and 52 and the joint flanges 25 and 26. Then, a catalyst downstream space 29 is formed between the diesel oxidation catalyst 2 and the soot filter 3. That is, the downstream end of the diesel oxidation catalyst 2 and the upstream end of the soot filter 3 (filter inner case 20) face each other with a distance L2 for sensor attachment.

  As shown in FIGS. 1 and 9, 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 upstream cylinder portion 4a of the catalyst inner case 4 in the exhaust gas movement direction. To do. 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 sensor mounting interval L2 in the catalyst downstream space 29, the cylinder length L3 of the upstream cylinder portion 4a of the catalyst inner case 4 and the cylinder length L5 of the filter inner case 20 is It is configured to be substantially equal to a length (L4 + L6) obtained by adding the cylindrical length L4 of the catalyst outer case 5 and the cylindrical length L6 of the filter outer case 21.

  Further, the upstream end portion of the filter inner case 20 protrudes from the upstream end portion of the filter outer case 21 by a difference in length between the cases 20 and 21 (L7≈L5−L6). Therefore, in a state in which the filter outer case 21 is connected to the catalyst outer case 5, the upstream side dimension L 7 of the filter inner case 20 protruding from the filter outer case 21 is the downstream side of the catalyst outer case 5 (the downstream side of the catalyst inner case 4). The upstream end of the filter inner case 20 is inserted into the cylindrical part 4b). That is, the upstream side of the filter inner case 20 is inserted into the downstream side cylinder portion 4b (catalyst downstream side space 29) so as to be extractable.

  With the above configuration, nitrogen dioxide (NO 2) generated by the oxidation action of the diesel oxidation catalyst 2 is supplied into the soot filter 3 from one side end face (intake side end face) 3 a. Particulate matter (PM) contained in the exhaust gas of the diesel engine 70 is collected by the soot filter 3 and continuously oxidized and removed by nitrogen dioxide (NO2). In addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 70, the content of carbon monoxide (CO) and hydrocarbon (HC) in the exhaust gas of the diesel engine 70 is reduced.

  As shown in FIGS. 1, 8, and 9, the silencer 30 for attenuating exhaust gas noise discharged from the diesel engine 70 is made of a heat-resistant metal material and is made of a substantially cylindrical silencer inner case 31 and made of a heat-resistant metal material. A cylindrical silencer outer case 32 and a disk-like side lid 33 fixed to the downstream side end of the silencer outer case 32 by welding. A silencer inner case 31 is provided in the silencer outer case 32. The muffler outer case 32 and the catalyst outer case 5 and the filter outer case 21 constitute the DPF casing 60 described above. The diameter of the cylindrical silencer outer case 32 is substantially the same as the diameter of the cylindrical catalyst outer case 5 or the diameter of the cylindrical filter outer case 21.

  Disc-shaped inner lid bodies 36 and 37 are fixed to both ends of the muffler inner case 31 in the exhaust gas movement direction by welding. A pair of exhaust gas introduction pipes 38 is provided between the inner lid bodies 36 and 37. The upstream end of each exhaust gas introduction pipe 38 passes through the upstream inner lid 36. The downstream end portion of each exhaust gas introduction pipe 38 is closed by a downstream inner lid body 37. A plurality of communication holes 39 are formed in an intermediate portion of each exhaust gas introduction pipe 38. An expansion chamber 45 is communicated with each exhaust gas introduction pipe 38 through a communication hole 39. The expansion chamber 45 is formed inside the silencer inner case 31 (between the inner lids 36 and 37).

  Exhaust gas outlet pipes 34 arranged between the exhaust gas introduction pipes 38 are 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 large number of exhaust holes 46 are formed in the entire exhaust gas outlet pipe 34 inside the silencer inner case 31. Each exhaust gas introduction pipe 38 communicates with the exhaust gas outlet pipe 34 via a plurality of communication holes 39, an expansion chamber 45 and a number of exhaust holes 46. A tail pipe 48 is connected to the other end side of the exhaust gas outlet pipe 34. With the above configuration, the exhaust gas that has entered the both exhaust gas introduction pipes 38 of the silencer inner case 31 passes through the exhaust gas outlet pipe 34 via the plurality of communication holes 39, the expansion chambers 45, and the numerous exhaust holes 46. The sound is discharged out of the silencer 30 through the tail pipe 48.

  As shown in FIGS. 1 and 9, the inner diameter side of the filter outlet side joining flange 40 having a thin ring shape is welded and fixed to the downstream end of the filter inner case 20. The outer diameter side of the filter outlet side joining flange 40 is projected toward the outer peripheral side (radius outside, radial direction) of the filter outer case 21. The downstream end of the filter outer case 21 is fixed by welding to the outer peripheral side of the filter outlet side joining flange 40 (corner corner of the end face L shape). A thin-plate-like silencer-side joining flange 41 that protrudes from the outer peripheral side (radius outside) of the silencer outer case 32 is welded and fixed to the upstream end of the silencer inner case 31. In addition, the upstream side of the silencer inner case 31 is protruded by a predetermined cylindrical dimension L10 on the exhaust gas upstream side of the silencer side joining flange 41. The upstream end of the silencer outer case 32 is fixed by welding to the outer peripheral surface of the silencer inner case 31 on the downstream side of the silencer side joining flange 41.

  As shown in FIG. 1 and FIG. 7 to FIG. 10, a pair of thick plates that butt the filter outlet side joining flange 40 and the muffler side joining flange 41 through the gasket 24 and surround the outer peripheral sides of the outer cases 21 and 32. The outlet flanges 53 and 54 hold the joint flanges 40 and 41 from both sides in the exhaust gas movement direction. The filter outer case 21 and the silencer outer case 32 are detachably connected by fastening the outlet clamping flanges 53 and 54 to the joint flanges 40 and 41 with bolts 42 and nuts 43, respectively.

  As shown in FIG. 1 and FIG. 9, the cylindrical length L9 of the silencer outer case 32 in the exhaust gas movement direction is shorter than the cylindrical length L8 of the silencer inner case 31 in the exhaust gas movement direction. The upstream end of the silencer inner case 31 protrudes from the upstream end (joining flange 41) of the silencer outer case 32 by a difference in length between the cases 31 and 32 (L10≈L8−L9). . In other words, in a state where the silencer outer case 32 is connected to the filter outer case 21, the downstream end (filter outlet side joining flange 40) of the filter outer case 21 is only the dimension L10 where the upstream end of the silencer inner case 31 protrudes. The upstream end portion of the muffler inner case 31 is inserted into the filter downstream space 49 formed inside.

  As shown in FIGS. 1 and 7 to 10, the thick plate-like central clamping flange 51 (52) is divided into a plurality (two in the embodiment) in the circumferential direction of the catalyst outer case 5 (filter outer case 21). The semicircular arc bodies 51a and 51b (52a and 52b) are used. The semicircular arc bodies 51a and 51b (52a and 52b) of the embodiment are formed in an arc shape (substantially semicircular horseshoe shape). In a state where the filter outer case 21 is connected to the catalyst outer case 5, the respective end portions of the semicircular arc bodies 51a and 51b (52a and 52b) come into contact with each other. That is, the semicircular arc members 51a and 51b (52a and 52b) are configured so that the outer peripheral side of the catalyst outer case 5 (filter outer case 21) is annularly surrounded.

  The central clamping flange 51 (52) is provided with a plurality of bolt fastening portions 55 with through holes at equal intervals along the circumferential direction. In the embodiment, eight bolt fastening portions 55 are provided on one set of central clamping flanges 51. When viewed in units of the semicircular arc bodies 51a and 51b (52a and 52b), the bolt fastening portions 55 are provided at four locations at equal intervals along the circumferential direction. On the other hand, bolt holes 56 corresponding to the respective bolt fastening portions 55 of the center clamping flange 51 (52) are formed through the catalyst side joining flange 25 and the filter side joining flange 26.

  When connecting the catalyst outer case 5 and the filter outer case 21, the outer peripheral side of the catalyst outer case 5 is surrounded by the catalyst-side semicircular arcs 51 a and 51 b, and the outer peripheral side of the filter outer case 21 is both on the filter side. The catalyst-side joining flange 25 and the filter-side joining flange 26, which are enclosed by the semicircular arc bodies 52a and 52b and sandwich the gasket 24, are joined from both sides in the exhaust gas movement direction by these semicircular arc bodies (center clamping flanges 51 and 52). Hold it.

  In this state, the bolts 27 are inserted into the bolt fastening portions 55 of the center clamping flanges 51 and 52 on both sides and the bolt holes 56 of the joint flanges 25 and 26 and tightened with the nuts 28. As a result, the joint flanges 25 and 26 are sandwiched and fixed by the center sandwich flanges 51 and 52, and the connection between the catalyst outer case 5 and the filter outer case 21 is completed. Here, the abutting portions of the ends of the catalyst-side semicircular arcs 51a and 51b and the filter-side semicircular arcs 52a and 52b are configured to be positioned with a phase shift of 72 °.

  As shown in FIGS. 1 and 7 to 10, the thick plate-shaped outlet pinching flange 53 (54) is divided into a plurality (two in the embodiment) in the circumferential direction of the filter outer case 21 (silencer outer case 32). The semicircular arc bodies 53a and 53b (54a and 54b) are used. The semicircular arc bodies 53a, 53b (54a, 54b) of the embodiment have basically the same form as the semicircular arc bodies 51a, 51b (52a, 52b) of the center clamping flange 51 (52). The outlet clamping flange 53 (54) is also provided with a plurality of bolt fastening portions 57 with through holes at equal intervals along the circumferential direction. On the other hand, bolt holes 58 corresponding to the respective bolt fastening portions 57 of the outlet clamping flange 53 (54) are formed through the filter outlet side joining flange 40 and the silencer side joining flange 41.

  When connecting the filter outer case 21 and the silencer outer case 32, the outer periphery side of the filter outer case 21 is surrounded by both semicircular arcs 53 a and 53 b on the filter outlet side, and the outer periphery side of the silencer outer case 32 is the silencer side. The filter outlet side joining flange 40 and the muffler side joining flange 41, which are surrounded by both the semicircular arc bodies 54a and 54b and sandwich the gasket 24, are arranged in the exhaust gas movement direction by these semicircular arc bodies (exit sandwiching flanges 53 and 54). Clamp from both sides.

  In this state, the bolts 42 are inserted into the bolt fastening portions 57 of the outlet clamping flanges 53 and 54 on both sides and the bolt holes 58 of the joint flanges 40 and 41 and tightened with the nuts 43. As a result, both the joining flanges 40 and 41 are sandwiched and fixed by the both outlet sandwiching flanges 53 and 54, and the connection between the filter outer case 21 and the silencer outer case 32 is completed. Here, the abutting portions of the ends of the semicircular arc bodies 53a and 53b on the filter outlet side and the semicircular arc bodies 54a and 54b on the silencer side are configured to be positioned with a phase shift of 72 °.

  As shown in FIGS. 1 and 7 to 10, at least one of the sandwiching flanges 51 to 54 has a left bracket leg as a support for supporting the DPF casing 60 (outer cases 5, 21, 32) on the diesel engine 70. 61 is attached. In the embodiment, in one of the semicircular arc bodies 53a of the outlet holding flange 53 on the filter outlet side, the support body fastening portion 59 with a through hole is integrated at two locations so as to be positioned between the adjacent bolt fastening portions 57. Is formed. On the other hand, the left bracket leg 61 is integrally formed with a mounting boss portion 86 corresponding to the support body fastening portion 59 described above.

  With the above configuration, the mounting boss portion 86 of the left bracket leg 61 is bolted to the support fastening portion 59 of one semicircular arc member 53a on the filter outlet side, so that the left side of the outlet clamping flange 53 on the filter outlet side The bracket leg 61 is detachably fixed. One end side of the right bracket leg 62 is welded and fixed to the outer peripheral side of the DPF casing 60 (catalyst outer case 5), and the other end sides of the left and right bracket legs 61 and 62 are DPF formed on the upper surface of the flywheel housing 78. As described above, the bolts are fastened to the attachment portion 80. As a result, the DPF 1 is stably connected and supported on the upper portion of the flywheel housing 78 that is a highly rigid member by the left and right bracket legs 61 and 62 and the exhaust gas exhaust pipe 103 of the turbine case 101.

  As shown in FIGS. 1 and 7 to 10, the gas purifier (diesel oxidation catalyst 2, soot filter 3) that purifies the exhaust gas exhausted by the engine 70, and the respective interiors in which the diesel oxidation catalyst 2 and soot filter 3 are built. It has cases 4, 20, and 31 and outer cases 5, 21, and 32 that house the inner cases 4, 20, and 31, respectively. The inner cases 4, 20, 31 are connected to the outer cases 5, 21, 32 via joint flanges 25, 26, 40, 41 that protrude from the outer peripheral side of the outer cases 5, 21, 32. . The gas purifier (diesel oxidation catalyst 2, soot filter 3), a plurality of combinations of the inner cases 4, 20, 31 and the outer cases 5, 21, 32 are provided, and the joining flanges 25, 26 (40, 41) are provided. A plurality of outer cases 5, 21, 32 are connected by being clamped and fixed by a pair of clamping flanges 51, 52 (53, 54).

  Therefore, the adjacent joining flanges 25 and 26 (40, 41) can be clamped (contacted) by being sandwiched from both sides by the sandwiching flanges 51, 52 (53, 54). In addition, since the sandwiching flanges 51 to 54 are configured separately without being welded to the outer cases 5, 21, 32, the stress caused by welding in the relationship between the sandwiching flanges 51 to 54 and the outer cases 5, 21, 32. There is no risk of concentration or distortion problems. Therefore, a substantially uniform pressure contact force can be applied to the entire joining flanges 25 and 26 (40, 41), and the surface pressure of the sealing surfaces (clamping surfaces) of the clamping flanges 51 to 54 can be maintained at a high level. As a result, it is possible to reliably prevent exhaust gas leakage from between the joint flanges 25 and 26 (40 and 41).

  As shown in FIG. 1 and FIGS. 7 to 10, each of the holding flanges 51 to 54 has horseshoe-shaped semicircular arcs 51 a and 51 b (52 a, 52 b, and 53 a) that are divided into a plurality in the circumferential direction of the outer cases 5, 21, and 32. 53b, 54a, 54b), and is configured to surround the outer peripheral side of the outer cases 5, 21, 32 by a plurality of semicircular arc members 51a, 51b (52a, 52b, 53a, 53b, 54a, 54b). Yes. Therefore, although it is the clamping flanges 51-54 comprised by several semi-arc body 51a, 51b (52a, 52b, 53a, 53b, 54a, 54b), it will be in the same assembly | attachment state as an integrated object. For this reason, it is easy to assemble the holding flanges 51 to 54 as compared with the ring-shaped one, and the assembling workability can be improved. Moreover, DPF1 with high sealing performance can be comprised, suppressing processing cost and assembly | attachment cost.

  Next, the detailed structure of each joint flange 25, 26, 40 will be described with reference to FIG. Since each of the joining flanges 25, 26, 40 has basically the same structure, the catalyst side joining flange 25 that is welded and fixed to the catalyst inner case 4 and the catalyst outer case 5 will be described as a representative example. FIG. 11 shows an enlarged side sectional view of the catalyst side joining flange 25 in the embodiment. As shown in FIG. 11, the catalyst-side joining flange 25 has a step portion 25a whose end face in the cross section is bent in a step shape in the middle of the L shape. The downstream end portion of the catalyst outer case 5 is fitted on the step portion 25 a, and the step portion 25 a is welded and fixed to the downstream end portion of the catalyst outer case 5.

  On the other hand, an L-shaped inner diameter side end 25b of the catalyst side joining flange 25 extends in the extending direction (exhaust gas movement direction) of the catalyst inner case 4 (catalyst outer case 5). The inner diameter side end portion 25 b is fitted on the downstream end portion of the catalyst inner case 4, and the inner diameter side end portion 25 b is welded and fixed to the catalyst inner case 4. On the other hand, an L-shaped outer diameter side end portion 25c of the catalyst side joining flange 25 is extended from the outer periphery of the catalyst outer case 5 in the radial direction (vertical direction). The high rigidity of the catalyst side joining flange 25 is ensured by the cross-sectional end face L shape of the catalyst side joining flange 25 and the formation of the step portion 25a.

  The clamping flanges 51, 52 and the joining flanges 25, 26 are inserted into the clamping flanges 51, 52 and the joining flanges 25, 26 through the respective bolt holes 56, and the nuts 28 are screwed together. The outer diameter side end 25c of the catalyst side joining flange 25 is clamped by the clamping flanges 51 and 52 as described above.

  Next, as shown in FIGS. 1 and 12, the upstream gas temperature sensor 109 (downstream gas temperature sensor 112) attached to the DPF 1 will be described. One end of the cylindrical sensor boss body 110 is welded and fixed to the outer peripheral surface of the catalyst inner case 4 between the upstream cylinder portion 4 a and the downstream cylinder portion 4 b of the catalyst inner case 4. From the sensor mounting opening 5a of the catalyst outer case 5, the other end side of the sensor boss body 110 is extended in the radial direction toward the outside of the case 5. A sensor mounting bolt 111 is screwed to the other end side of the sensor boss body 110. For example, a thermistor type upstream gas temperature sensor 109 is passed through the sensor mounting bolt 111, and the upstream gas temperature sensor 109 is supported by the sensor boss body 110 via the sensor mounting bolt 111. A detection portion of the upstream gas temperature sensor 109 is inserted into the catalyst downstream space 29.

  With the above configuration, when exhaust gas is discharged from the gas outflow side end surface 2 b of the diesel oxidation catalyst 2, the exhaust gas temperature is detected by the upstream gas temperature sensor 109. In the same manner as described above, as shown in FIG. 1, for example, a thermistor type downstream gas temperature sensor 112 is attached to the sensor boss body 110 via a sensor mounting bolt 111, and the other end face (discharge end face) 3b of the soot filter 3 is attached. The downstream gas temperature sensor 112 detects the temperature of the exhaust gas.

  Next, with reference to FIGS. 10 and 13 to 20, a mounting structure of the differential pressure sensor 63 attached to the DPF 1 will be described. As shown in FIG. 13, a differential pressure sensor 63 is provided as an exhaust gas pressure sensor. The differential pressure sensor 63 is for detecting the pressure difference of the exhaust gas between the upstream side and the downstream side across the soot filter 3 in the DPF 1. Based on the pressure difference, the amount of particulate matter deposited on the soot filter 3 is converted, and the clogged state in the DPF 1 can be grasped. That is, based on the pressure difference of the exhaust gas detected by the differential pressure sensor 63, the regeneration control of the soot filter 3 can be automatically executed by operating an accelerator control means or an intake throttle control means (not shown), for example. It is configured.

  As shown in FIGS. 13 to 19, the sensor bracket 66 is bolted to the mute-side inlet pinching flange 54, and the sensor bracket 66 is disposed on the upper surface side of the DPF casing 60. A detection main body 67 of the differential pressure sensor 63 is attached to the sensor bracket 66. An upstream pipe joint body 64 and a downstream pipe joint body 65 are connected to a detection main body 67 of the differential pressure sensor 63 via an upstream sensor pipe 68 and a downstream sensor pipe 69, respectively. Similar to the sensor boss body 110, the sensor boss body 113 is disposed in the DPF casing 60. The upstream side pipe joint body 64 (downstream side pipe joint body 65) is fastened to the sensor boss body 113 by the pipe joint bolt 114.

  As shown in FIGS. 10 and 13 to 19, a sensor support portion 44 is formed integrally with a part of the mute-side inlet clamping flange 54, and a sensor bracket 66 is fastened to the sensor support portion 44 with a bolt 47. A silencer-side inlet pinching flange 54 (flange body for mounting an exhaust gas purification case) is attached to and detached from a filter outlet-side outlet pinching flange 53 (flange body for mounting an exhaust gas pressure sensor) via bolts 42 and nuts 43. It is concluded that possible. That is, a sensor bracket 66 for attaching an exhaust gas pressure sensor is detachably provided on the sensor support 44, and a differential pressure sensor (exhaust gas pressure sensor) 63 is disposed on the outer surface of the filter outer case (exhaust gas purification case) 21. ing.

  As shown in FIGS. 13, 15, and 19, a sensor boss body 113 as a sensor piping body is provided in the catalyst inner case 4 (or the filter inner case 20) as an exhaust gas purification case. An upstream pipe joint body 64 (or downstream pipe joint body 65) for connecting sensor piping is fastened to the sensor boss body 113 via a pipe joint bolt 114, and the catalyst outer case 5 (or the filter outer side) as an exhaust gas purification case. A steel pipe upstream sensor pipe 68 (or downstream sensor pipe 69) is extended from the sensor boss body 113 toward the differential pressure sensor 67 as an exhaust gas pressure sensor along the outer peripheral shape of the case 21). . A differential pressure sensor 67 is connected to the upstream sensor pipe 68 (or downstream sensor pipe 69) via an upstream flexible pipe 137 (or downstream flexible pipe 138) made of synthetic resin.

  With the above configuration, the difference between the exhaust gas pressure on the inflow side of the soot filter 3 and the exhaust gas pressure on the outflow side of the soot filter 3 (differential pressure of the exhaust gas) is detected via the differential pressure sensor 67. Since the residual amount of particulate matter in the exhaust gas collected by the soot filter 3 is proportional to the differential pressure of the exhaust gas, the difference occurs when the amount of particulate matter remaining in the soot filter 3 increases more than a predetermined amount. Based on the detection result of the pressure sensor 67, regeneration control for reducing the amount of particulate matter in the soot filter 3 (for example, control for increasing the exhaust temperature) is executed. When the residual amount of the particulate matter further increases beyond the regeneration controllable range, the maintenance work for removing and removing the DPF casing 60, cleaning the soot filter 3 and removing the particulate matter artificially is performed.

  As shown in FIGS. 1, 13, and 18 to 21, a diesel oxidation catalyst 2 or soot filter 3 and a diesel oxidation catalyst 2 or soot filter 3 as gas purifiers that purify exhaust gas discharged from a diesel engine 70 are provided. In an exhaust gas purification apparatus including a gas purification housing 60 (catalyst inner case 4, catalyst outer case 5, filter inner case 20, filter outer case 21) provided therein, as a support bracket for supporting a DPF casing 60 as a gas purification housing The casing side bracket leg 62 is formed with a bolt through hole 87a, the casing side bracket leg 62 is formed with a notch groove 89 as an insertion guide, and the bolt through hole 87a is formed. As a mounting bolt through a notch groove 89 It is configured so as to disengage the tipping bolt 87.

  Therefore, after mounting the temporary fixing bolt 87 in a semi-fixed state on the diesel engine 70 side or the machine side mounting portion (DPF mounting portion 80) to which the casing side bracket leg 62 is connected, the front bolt 87 is cut. The bolt through hole 87a can be engaged via the notch groove 89, and the DPF casing 60 can be supported at the attachment site. That is, the operator can fasten the casing-side bracket leg 62 by tightening the mounting bolt 88 for retrofitting while releasing the hand from the DPF casing 60. The DPF casing 60 can be attached and detached by one worker. Assembling workability of the heavy DPF casing 60 can be improved.

  As shown in FIGS. 1, 13, and 18 to 21, a notch groove 89 is formed by a notch for bolt insertion provided in the casing side bracket leg 62, and the casing side bracket leg 62 is formed through the notch groove 89. The bolt through hole 87a is opened to the side edge, the bolt through hole 87a is engaged with the temporary bolt 87 in the temporarily fixed state via the notch groove 89, and the DPF casing 60 (gas The purification housing) can be supported.

  Therefore, the bolt through hole 87 a can be engaged with the tip bolt 87 temporarily fixed in the semi-fixed state via the notch groove 89. That is, the operator can fasten the casing-side bracket leg 62 by tightening the mounting bolt 88 for retrofitting while releasing the hand from the DPF casing 60. The DPF casing 60 can be attached and detached by one worker. Assembling workability of the heavy DPF casing 60 can be improved.

  As shown in FIGS. 1, 13, and 18 to 21, as an outer case body outside the catalyst inner case 4 or the filter inner case 20 as an exhaust gas purification case in which the diesel oxidation catalyst 2 or the soot filter 3 is installed. The catalyst outer case 5 or the filter outer case 21 is fitted, and the catalyst inner case 4 or the filter inner case 20 and the catalyst outer case 5 or the filter outer case 21 form a DPF casing 60 as a gas purification housing. The casing side bracket leg 62 is integrally fixed to the outer case 5 or the filter outer case 21. Therefore, the catalyst outer case 5 or the filter outer case 21 can easily keep the catalyst inner case 4 or the filter inner case 20 warm and improve the rigidity of the DPF casing 60.

  As shown in FIGS. 1, 13, and 18 to 21, a plurality of sets of gas purification bodies (diesel oxidation catalyst 2 or soot filter 3) and exhaust gas purification cases (catalyst inner case 4 or filter inner case 20) and outer case are provided. Body (catalyst outer case 5 or filter outer case 21) for connecting the plurality of catalyst outer cases 5 or filter outer cases 21 to connection boundary positions of the plurality of diesel oxidation catalysts 2 or soot filters 3. While the catalyst-side joining flange 25 or the filter-side joining flange 26 as the flange body is offset, the casing-side bracket leg 62 is integrally fixed to at least one of the plurality of catalyst outer cases 5 and the filter outer case 21. It is configured as follows.

  Therefore, the disassembly / assembly work of the diesel oxidation catalyst 2 or the soot filter 3 and the catalyst inner case 4 or the filter inner case 20 can be simplified. While it is possible to improve maintenance workability such as soot clogging removal of the soot filter 3, exhaust gas leakage or the like can be easily prevented by the catalyst side joining flange 25 or the filter side joining flange 26.

  As shown in FIG. 1, FIG. 13, FIG. 18 to FIG. 21, a plurality of sets of diesel oxidation catalyst 2 or soot filter 3 and catalyst inner case 4 or filter inner case 20 and catalyst outer case 5 or filter outer case 21 are provided, While offsetting the catalyst side joining flange 25 or the filter side joining flange 26 for connecting the plurality of catalyst outer cases 5 or the filter outer cases 21 with respect to the connection boundary positions of the plurality of diesel oxidation catalysts 2 or soot filters 3 Of the plurality of catalyst outer cases 5 or filter outer cases 21, a casing side bracket leg 62 having a notch groove 89 is fixed to the catalyst outer case 5 on the side where the dimension in the exhaust gas movement direction is long. It is configured to make it.

  Therefore, the disassembly / assembly work of the diesel oxidation catalyst 2 or the soot filter 3 and the catalyst inner case 4 or the filter inner case 20 can be simplified. While it is possible to improve maintenance workability such as soot clogging removal of the diesel oxidation catalyst 2 or the soot filter 3, exhaust gas leakage or the like can be easily prevented by the catalyst side joining flange 25 or the filter side joining flange 26. Moreover, the casing side bracket leg 62 in which the notch groove 89 is formed can be assembled with high rigidity using the long catalyst outer case 5.

  As shown in FIG. 1, FIG. 13, FIG. 18 to FIG. 21, a plurality of sets of diesel oxidation catalyst 2 or soot filter 3 and catalyst inner case 4 or filter inner case 20 and catalyst outer case 5 or filter outer case 21 are provided. While offsetting the catalyst side joining flange 25 or the filter side joining flange 26 for connecting the plurality of catalyst outer cases 5 or the filter outer case 21 with respect to the connection boundary positions of the plurality of gas purifiers, Of the catalyst outer case 5 or the filter outer case 21, the casing side bracket leg 62 in which the notch groove 89 is formed is fixed to the catalyst outer case 5 provided with the exhaust gas inlet pipe 16. .

  Therefore, the disassembly / assembly work of the diesel oxidation catalyst 2 or the soot filter 3 and the catalyst inner case 4 or the filter inner case 20 can be simplified. While it is possible to improve maintenance workability such as soot clogging removal of the diesel oxidation catalyst 2 or the soot filter 3, exhaust gas leakage or the like can be easily prevented by the catalyst side joining flange 25 or the filter side joining flange 26. Further, the casing-side bracket leg 62 in which the notch groove 89 is formed and the exhaust gas inlet pipe 16 can be assembled with high rigidity using the long catalyst outer case 5.

2 Diesel oxidation catalyst (gas purifier)
3 Soot filter (gas purifier)
4 catalyst inner case 5 catalyst outer case 16 exhaust gas inlet pipe 20 filter inner case (exhaust gas purification case)
21 Filter outer case (exhaust gas purification case)
25 Catalyst side joint flange (flange body)
26 Filter side joint flange (flange body)
60 DPF casing (gas purification housing)
62 Casing side bracket leg (support bracket)
70 Diesel engine 80 DPF mounting portion 87 Mounting bolt 87a Bolt hole 89 Insertion guide

Claims (2)

In an exhaust gas purification device comprising a gas purification body for purifying exhaust gas discharged from an engine, and a gas purification housing in which the gas purification body is installed,
A structure including a support bracket for supporting the gas purification housing, wherein a bolt hole is formed in the support bracket, and an insertion guide is formed by a notch for bolt insertion established in the support bracket,
An exhaust gas purifying apparatus, wherein a mounting bolt provided at a mounting site to which the support bracket is connected is configured to be engaged with and disengaged from the bolt hole via the insertion guide. An outer case body is fitted outside an exhaust gas purification case in which the gas purification body is installed, and the gas purification housing is formed by the exhaust gas purification case and the outer case body, and the support is supported by the outer case body It is configured to fix the bracket together,
An exhaust gas inlet pipe for allowing the exhaust gas from the engine to flow into the gas purification housing and opening the bolt hole at a side edge of the support bracket through the bolt insertion notch;
2. The exhaust gas according to claim 1, wherein a direction in which the mounting bolt is engaged and disengaged with respect to the insertion guide is substantially the same as an exhaust gas moving direction when heading from the engine to the exhaust gas inlet pipe. Purification equipment.

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