JP4933493B2 - Exhaust gas purification device - Google Patents

Description

  The present invention relates to an exhaust gas purification apparatus suitable for use in removing harmful substances in exhaust gas discharged from an engine, for example.

  In general, a construction machine such as a hydraulic excavator is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front and rear side of the upper revolving body that can be moved up and down. And a working device. The upper swing body has an engine for driving a hydraulic pump on the rear side of the swing frame, and a cab, a fuel tank, a hydraulic oil tank, and the like are mounted on the front side of the swing frame.

  Here, a diesel engine is generally used as an engine of a hydraulic excavator. This diesel engine is supposed to discharge harmful substances such as particulate matter (PM) and nitrogen oxides (NOx). Therefore, the hydraulic excavator has a configuration in which an exhaust gas purification device is provided in an exhaust pipe that forms an exhaust gas passage of the engine.

  This exhaust gas purification device collects particulate matter in exhaust gas and removes it (usually called Diesel Particulate Filter, also called DPF for short), nitrogen oxide (NOx). It includes processing members such as a selective reduction catalyst that purifies using an aqueous urea solution, an oxidation catalyst that oxidizes and removes carbon monoxide (CO), and hydrocarbons (HC) (see, for example, Patent Document 1).

JP 2003-120277 A

  Here, the exhaust gas purifying apparatus according to Patent Document 1 includes, for example, an upstream cylinder disposed on the upstream side in the exhaust gas flow direction of the engine, a downstream cylinder disposed on the downstream side, and between these cylinders. A purification unit cylinder provided in series is provided, and processing members such as a particulate matter removal filter, an oxidation catalyst, and a selective reduction catalyst are accommodated inside the purification unit cylinder. And these upstream cylinders, purification | cleaning part cylinders, and downstream cylinders are attached to structures, such as the engine provided in the upper revolving body, in the state connected mutually in series using means, such as a flange connection. It has become.

  By the way, the particulate matter removal filter for purifying the exhaust gas collects the particulate matter in the exhaust gas, and therefore performs a cleaning operation to periodically remove the collected particulate matter. There is a need. Here, when performing the cleaning operation of the particulate matter removal filter, first, the purification unit cylinder is removed from the structure such as the engine with the upstream cylinder and the downstream cylinder removed from the purification unit cylinder. Then, the particulate matter removal filter accommodated in the purification unit cylinder is taken out and cleaned.

  Then, after the particulate matter removal filter that has been cleaned is attached to the purification unit cylinder, the purification unit cylinder is again attached to a structure such as an engine, and the upstream cylinder and the downstream cylinder are connected to the purification unit cylinder. Install.

  However, in the exhaust gas purification device according to Patent Document 1 described above, the purification unit cylinder housing a particulate matter removal filter and the like is attached to the engine using U bolts and nuts. For this reason, when removing the purification unit cylinder, the U bolt that fixes the purification unit cylinder to the engine side with the flange portion of the purification unit cylinder removed from the flanges of the upstream cylinder and the downstream cylinder. Need to remove the nut.

  As a result, when performing cleaning, inspection, and repair work on the particulate matter removal filter, it takes time to remove and install the particulate matter removal filter. There is a problem that it falls.

  Further, when the exhaust gas treatment device is a NOx purification device, it is necessary to periodically remove deposits deposited from the urea aqueous solution attached to the urea injection valve, the selective reduction catalyst, etc., which are the processing members, Similar to the above-described cleaning operation of the particulate matter removal filter, it takes time to remove and attach the NOx purification device to the purification unit cylinder.

  The present invention has been made in view of the above-described problems of the prior art, and is an exhaust capable of enhancing workability when performing a cleaning operation, an inspection operation, a repair operation, or the like on a processing member incorporated in a purification unit cylinder. The object is to provide a gas purification device.

In order to solve the above-described problems, the present invention provides an upstream cylinder provided in an exhaust gas passage of an engine mounted on a vehicle body, a downstream cylinder provided on the downstream side of the upstream cylinder, and the upstream cylinder. And a purification unit cylinder in which a treatment member for purifying exhaust gas is provided, connected in series between the purification unit cylinder and the downstream cylinder, and the purification unit cylinder accommodates the treatment member therein Exhaust gas purification apparatus comprising: a cylindrical case to be opened; an opening formed on the upper surface side of the cylindrical case for attaching and removing the processing member; and a lid that covers the opening so as to be opened and closed Applies to

According to a first aspect of the present invention, the cylindrical case sandwiches the opening and a cylindrical portion in which the opening is formed at an intermediate portion in the axial direction by cutting the upper surface side into a semicircular shape. The left and right case-side brackets provided radially projecting from the outer peripheral side of the cylindrical portion, and the processing member provided in the axial direction spaced apart forward and rearward on the inner peripheral surface of the cylindrical portion. The lid is configured with front and rear stoppers on the case side to be fixed, and the lid body is set to have a longitudinal dimension larger than the longitudinal dimension of the opening so as to cover the opening, and both ends of the cylindrical case And is formed as a semicircular cross-sectional plate covering the upper surface of the cylindrical portion, and provided with left and right lid side brackets facing the respective case side brackets of the cylindrical case at the lower end portion, The processing member provided in a rearward direction is axially The front and rear stoppers are fixed on the lid side, and a gasket is provided between the lid and the cylindrical case so as to surround the opening, and the lid side stopper is provided on the gasket. A notch part through which the stopper is inserted in a corresponding part, and left and right clamping parts sandwiched between each case side bracket of the cylindrical case and each lid body side bracket of the lid, The gasket is disposed between the cylindrical portion and the case side bracket of the cylindrical case, and the lid and the lid side bracket in a state where the processing member is accommodated in the cylindrical case through the opening. Each case side bracket of the cylindrical case, each lid side bracket of the lid, and each sandwiching portion of the gasket in a state where the treatment member is disposed and covered with the lid and the gasket In that the arrangement for fastening with fastening members.

The invention according to claim 2 is that a thick portion is formed between the notches of the gasket, and the thick portion is interposed between the stoppers on the lid side when the lid is fastened to the cylindrical case. there are disposed, in that the thick portion has a you closed configuration the gap between the processing member and the lid member by coming into contact with the outer peripheral surface of the processing member.

  According to the first aspect of the present invention, since the opening provided on the upper surface side of the cylindrical case can be opened by opening the lid, the processing member accommodated in the cylindrical case is opened. Can be removed to the outside. For this reason, it is possible to remove only the processing member from the cylindrical case of the purification unit cylinder while the purification unit cylinder is connected to the upstream cylinder and the downstream cylinder.

  Therefore, for example, when performing a cleaning operation, an inspection operation, a repair operation, etc., on the processing member, it is possible to eliminate a complicated prior work such as removing the upstream cylinder and the downstream cylinder connected to the purification unit cylinder. It is possible to improve workability when performing a cleaning operation on the processing member.

Further, the upstream cylinder to purify part cylinder, even while connecting the downstream cylinder body, only extracting the fastener from the case side bracket of the cylindrical case of the purification of part cylinder, be easily removed the lid And the opening provided on the upper surface side of the cylindrical case can be opened. Accordingly, the processing member can be taken out of the cylindrical case through the opening, and a cleaning operation or the like for the processing member can be easily performed.

On the other hand, after the cleaned processing member is attached to the cylindrical case through the opening, the lid and the gasket are attached to the cylindrical case using a fastening member, so that the opening can be covered with the lid. it can. In this case, between the tubular case and the lid, a gasket is provided surrounding the opening, Runode sandwiching portion of the gasket is sandwiched between the case side bracket and lid side bracket, tubular A gap between the mounting surfaces of the case and the lid can be reliably sealed with a gasket. As a result, the exhaust gas introduced into the purification unit cylinder does not leak to the outside through the gap between the cylindrical case of the purification unit cylinder and the lid, and the exhaust gas is reliably guided to the processing member. Can do.

Furthermore, the mounting process member into the cylindrical case of the purifying part cylinder, the opening of the cylindrical case in a state covered with the lid, the stopper provided in these cylindrical case and the lid member, the processing member cylinder Can be fixed in the axial direction inside the case. As a result, it is possible to arrange the processing member at an appropriate position in the purification unit cylinder simply by attaching the cleaned processing member in the cylindrical case, and to ensure proper operation of the processing member after cleaning. be able to.
According to the invention of claim 2, when the lid is fastened to the cylindrical case, the thick part of the gasket comes into contact with the outer peripheral surface of the processing member. Thereby, the clearance gap between a process member and a cover body can be obstruct | occluded by the thick part of a gasket, and exhaust gas can be reliably guide | induced to a process member.

  Hereinafter, an embodiment of an exhaust gas purifying apparatus according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where it is applied to a hydraulic excavator.

  In the present embodiment, as an exhaust gas purification device, a particulate matter removal device (PM removal device) that removes particulate matter (PM) discharged from an engine by a particulate matter removal filter (DPF) is illustrated. .

  The exhaust gas removing device used in the present embodiment includes an upstream cylinder containing the oxidation catalyst and the silencer cylinder, a downstream cylinder containing the silencer cylinder, and a filter containing the particulate matter removal filter. The three cylinders are connected in series using bolts and nuts, and are attached to the engine side with support legs.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. The hydraulic excavator 1 can turn on a self-propelled crawler-type lower traveling body 2 and a swiveling device 3 on the lower traveling body 2. The upper swing body 4 that is mounted on the lower swing body 2 and forms a vehicle body, and the work device 5 that is provided on the front side of the upper swing body 4 so as to be able to move up and down and performs excavation work and the like. . The upper swing body 4 includes a swing frame 6, a cab 7, an engine 8, an exhaust gas purification device 21, and the like which will be described later.

  Reference numeral 6 denotes a revolving frame serving as a base of the upper revolving structure 4. The revolving frame 6 forms a strong support structure and is mounted on the lower traveling body 2 via the revolving device 3. Here, as shown in FIG. 2, the revolving frame 6 is provided with a thick bottom plate 6A extending in the front and rear directions, and standing on the bottom plate 6A, and in the front and rear directions with a predetermined interval in the left and right directions. An extended left vertical plate 6B, right vertical plate 6C, a plurality of left extended beams 6D extending leftward from the left vertical plate 6B, and a plurality of right extended beams 6E extended rightward from the right vertical plate 6C The left side frame 6F is fixed to the front end of each left extension beam 6D and extends in the front and rear directions, and the right side frame 6G is fixed to the front end of each right extension beam 6E and extends in the front and rear directions. ing.

  Reference numeral 7 denotes a cab (see FIG. 1) mounted on the left front side of the revolving frame 6. The cab 7 defines an operator's cab. Inside the cab 7, a driver's seat on which an operator is seated, various operation levers (none of which are shown), and the like are disposed.

  Reference numeral 8 denotes an engine mounted horizontally on the rear side of the turning frame 6, and the engine 8 is configured as a diesel engine, for example. Further, as shown in FIG. 2, an exhaust pipe 9 that forms part of an exhaust gas passage for exhaust gas exhaust is provided on the right side of the engine 8. A device 21 is attached.

  Here, the engine 8 has high efficiency and excellent durability, but exhausts harmful substances such as particulate matter (PM), nitrogen oxide (NOx), carbon monoxide (CO), etc. Will be discharged together. Therefore, the exhaust gas purification device 21 attached to the exhaust pipe 9 includes an oxidation catalyst 25 that oxidizes and removes carbon monoxide (CO) and the like, and a particulate matter that collects and removes the particulate matter, as will be described later. A removal filter 41 is included.

  A hydraulic pump 10 is attached to the right side of the engine 8, and the hydraulic pump 10 is driven by the engine 8 to discharge operating hydraulic oil toward various hydraulic actuators mounted on the hydraulic excavator 1. Is. Here, as shown in FIG. 4, in the hydraulic pump 10, the left end facing the engine 8 is a flange portion 10 </ b> A, and the flange portion 10 </ b> A is bolted to the engine 8. Further, when the flange portion 10A of the hydraulic pump 10 is attached to the engine 8, a purifier support bracket 16 described later is attached together.

  A heat exchanger 11 is provided on the left side of the engine 8. The heat exchanger 11 includes, for example, a radiator, an oil cooler, an intercooler, and the like. The engine cooling water, hydraulic oil, and supercharged air are cooled by releasing heat.

  A hydraulic oil tank 12 is located on the front side of the hydraulic pump 10 and mounted on the right side of the revolving frame 6. The hydraulic oil tank 12 stores hydraulic oil supplied to the hydraulic pump 10. Reference numeral 13 denotes a fuel tank provided on the front side of the hydraulic oil tank 12, and this fuel tank 13 stores fuel supplied to the engine 8 therein.

  Reference numeral 14 is a counterweight located on the rear side of the engine 8 and attached to the rear end of the revolving frame 6. The counterweight 14 balances the weight of the work device 5. Reference numeral 15 denotes a building cover disposed on the front side of the counterweight 14, and the building cover 15 accommodates the engine 8, the hydraulic pump 10, the heat exchanger 11, and the like.

  A purification device support bracket 16 is provided on the right side of the engine 8, and the purification device support bracket 16 constitutes a structure on the upper swing body 4 side that supports an exhaust gas purification device 21 described later. . The purifying device support bracket 16 is disposed on the support base 16A with the flange 10A of the hydraulic pump 10 together with the flange portion 10A. The front mounting plate 16C and the rear mounting plate 16D, which are supported in a vibration-proof manner via members 16B (only two are shown), are roughly configured.

  Next, an exhaust gas purification device for purifying exhaust gas discharged from the engine 8 will be described.

  That is, 21 is an exhaust gas purification device that is located on the upper right side of the engine 8 and is connected to the exhaust pipe 9. The exhaust gas purification device 21 constitutes an exhaust gas passage together with the exhaust pipe 9, and from upstream to downstream. During this period, the harmful substances contained in the exhaust gas are removed. Further, the exhaust gas purifying device 21 is arranged in a vertically extending state extending in the front and rear directions above the engine 8 such that the front side in the front and rear directions is the upstream side and the rear side is the downstream side.

  As shown in FIGS. 3 to 6, the exhaust gas purification device 21 includes three cylinders including an upstream cylinder 22, a downstream cylinder 28, and a filter cylinder 32 as a purification unit cylinder, which will be described later. Are connected in series with each other. As shown in FIG. 8, the upstream cylinder 22 accommodates a silencer cylinder 24B and an oxidation catalyst 25 of an inflow pipe 24 described later, and the downstream cylinder 28 silences an outflow pipe 30 described later. A container cylinder 30B is accommodated, and a particulate matter removal filter 41 described later is accommodated in the filter cylinder 32.

  An upstream cylinder 22 is provided on the upstream side of the exhaust gas passage and is located on the front side of the exhaust gas purification device 21. The upstream cylinder 22 constitutes an inlet portion into which exhaust gas flows. As shown in FIGS. 5 and 8, the upstream cylindrical body 22 is roughly constituted by a cylindrical case 23, an inflow pipe 24, an oxidation catalyst 25, and a support leg 26, which will be described later.

  Reference numeral 23 denotes a cylindrical case constituting an outer shell of the upstream cylindrical body 22, and the cylindrical case 23 closes the cylindrical portion 23A having a large cylindrical shape and the front side (upstream side) of the cylindrical portion 23A. The lid portion 23B is provided, and the flange portion 23C is provided in a bowl shape over the entire circumference at the rear (downstream) end of the cylindrical portion 23A. The flange portion 23C is provided with a plurality of bolt insertion holes 23D at intervals in the circumferential direction.

  In addition, as shown in FIGS. 3 and 4, the cylindrical case 23 is provided with two temperature sensor attachment ports 23 </ b> E that are positioned above the cylindrical portion 23 </ b> A. The two temperature sensor attachment ports 23E are for attaching temperature sensors 48 and 49 described later, and are arranged at two positions sandwiching an oxidation catalyst 25 described later in the front and rear directions. Further, an upstream pressure extraction portion 23F, for example, located on the right side is provided at the rear side position of the cylindrical portion 23A, and the pressure extraction portion 23F will be described later among the pressures of the exhaust gas flowing through the exhaust gas passage. The pressure upstream side of the particulate matter removing filter 41 is taken out, and a pressure sensor 47 described later is connected via an upstream side pipe 47A.

  Reference numeral 24 denotes an inflow pipe provided on the front side (upstream side) of the cylindrical case 23. The inflow pipe 24 penetrates the cylindrical portion 23A of the cylindrical case 23 in the diameter direction (see FIG. 10). As shown in FIG. 2, one end side of the inflow pipe 24 protruding from the cylindrical case 23 extends to the left side toward the exhaust pipe 9 and is connected to the exhaust pipe 9. On the other hand, the other end side of the inflow pipe 24 is closed by a closing plate 24A. The inflow pipe 24 constitutes a silencer cylinder 24B inside the cylindrical case 23, and exhaust gas passes through a plurality of small holes 24C provided in the silencer cylinder 24B. Is reduced.

Reference numeral 25 denotes an oxidation catalyst positioned in the downstream side of the inflow pipe 24 and accommodated in the cylindrical case 23. The oxidation catalyst 25 constitutes one of the processing members for purifying the exhaust gas. Here, as shown in FIGS. 6 and 8, the oxidation catalyst 25 is made of, for example, a ceramic cell-like cylinder having an outer diameter equivalent to the inner diameter of the cylindrical portion 23A. Through-holes 25A are formed, and the inner surface is coated with a noble metal or the like. The oxidation catalyst 25 oxidizes and removes carbon monoxide (CO), hydrocarbons (HC), etc. contained in the exhaust gas by causing the exhaust gas to flow through each through hole 25A at a predetermined temperature. Nitrogen oxide (NO) is removed as nitrogen dioxide (NO ₂ ).

  Reference numeral 26 denotes a support leg provided on the lower surface side of the cylindrical case 23 (cylindrical portion 23A). The support leg 26 is formed by bending a plate body into a substantially W shape, as shown in FIG. The upper end side is fixed to the lower surface of the cylindrical portion 23A using means such as welding. The lower end side of the support leg 26 is bolted to the front mounting plate 16C of the purification device support bracket 16.

  Reference numeral 27 denotes two positioning plates provided on the flange portion 23C of the cylindrical case 23. As shown in FIG. 6, the positioning plates 27 are arranged on the rear side with a predetermined interval on the outer periphery on the lower end side of the flange portion 23C. Installed to protrude. Each positioning plate 27 is brought into contact with a front flange portion 33B of a cylindrical case 33 constituting a filter cylinder 32, which will be described later, so that the cylindrical case 33 of the filter cylinder 32 is placed upstream. It is positioned at a position that is substantially coaxial with the cylindrical body 22.

  Reference numeral 28 denotes a downstream cylinder provided on the downstream side of the upstream cylinder 22 and located on the rear side of the exhaust gas purification device 21. The downstream cylinder 28 is connected to the upstream cylinder 22 with the filter cylinder 32 interposed therebetween. Is disposed on the opposite side and constitutes an outlet portion through which the exhaust gas flows out. As shown in FIGS. 5 and 8, the downstream cylindrical body 28 is generally configured by a cylindrical case 29, an outflow pipe 30, and a support leg 31 described later.

  29 is a cylindrical case that constitutes the outer shell of the downstream cylindrical body 28. The cylindrical case 29 is substantially the same as the cylindrical case 23 of the upstream cylindrical body 22, and a cylindrical portion 29A having a large-diameter cylindrical shape, A lid portion 29B provided by closing the rear side (downstream side) of the cylindrical portion 29A, and a flange portion 29C provided in a bowl shape over the entire circumference at the front side (upstream side) end portion of the cylindrical portion 29A. It is comprised by. The flange portion 29C is provided with a plurality of bolt insertion holes 29D at intervals in the circumferential direction.

  Further, a downstream pressure extraction portion 29E, for example, located on the right side is provided at the rear side position of the cylindrical portion 29A, and the pressure extraction portion 29E is in the form of particles out of the pressure of the exhaust gas flowing through the exhaust gas passage. A pressure sensor 47, which will be described later, is connected through a downstream pipe 47B.

  Reference numeral 30 denotes an outflow pipe called a tail pipe provided on the rear side (downstream side) of the cylindrical case 29. The outflow pipe 30 penetrates the cylindrical portion 29A of the cylindrical case 29 in the diameter direction (FIG. 8). reference). Further, the upper end side of the outflow pipe 30 protruding from the cylindrical case 29 protrudes above the building cover 15 shown in FIG. 1 and is released to the atmosphere. On the other hand, the lower end side of the outflow pipe 30 is closed by a closing plate 30A. The outflow pipe 30 constitutes a silencer cylinder 30B inside the cylindrical case 29, and exhaust gas passes through a large number of small holes 30C provided in the silencer cylinder 30B. Is reduced.

  Reference numeral 31 denotes a support leg provided on the lower surface side of the cylindrical case 29 (cylindrical portion 29A). The support leg 31 bends the plate body into a substantially W shape, like the support leg 26 of the upstream cylinder 22. The upper end side is fixed to the lower surface of the cylindrical portion 29A. Then, the lower end side of the support leg 31 is configured to be bolted to the rear mounting plate 16D of the purification device support bracket 16.

  Reference numeral 32 denotes a filter cylinder as a purification unit cylinder provided in series between the upstream cylinder 22 and the downstream cylinder 28. The filter cylinder 32 is a particulate material as a processing member. A removal filter 41 is incorporated. As shown in FIGS. 7 to 9, the filter cylinder 32 is roughly constituted by a cylindrical case 33, an opening 34, and a lid 37 described later.

  Reference numeral 33 denotes a cylindrical case constituting the outer shell of the filter cylinder 32. The cylindrical case 33 accommodates the particulate matter removing filter 41 therein. Here, the cylindrical case 33 includes a cylindrical portion 33A having substantially the same outer diameter as the cylindrical case 23 of the upstream cylindrical body 22 and the cylindrical case 29 of the downstream cylindrical body 28, and a front side (upstream side) of the cylindrical portion 33A. ) At the end of the front flange 33B provided in a bowl shape over the entire circumference, and a rear flange provided at the rear (downstream) end of the cylindrical section 33A in a bowl shape over the entire circumference. The portion 33C is roughly configured.

  The front flange portion 33B is provided with a plurality of bolt insertion holes 33D at intervals in the circumferential direction. The front flange portion 33B uses bolts 45 and nuts 46 described later inserted into the bolt insertion holes 33D. The upstream cylindrical body 22 is configured to be connected in series to the flange portion 23C of the cylindrical case 23. The rear flange portion 33C is also provided with a plurality of bolt insertion holes 33E at intervals in the circumferential direction, and the rear flange portion 33C uses bolts 45 and nuts 46 inserted into the respective bolt insertion holes 33E. The downstream cylindrical body 28 is configured to be connected in series to the flange portion 29C of the cylindrical case 29.

  Reference numeral 34 denotes an opening provided on the upper surface side of the cylindrical portion 33 </ b> A constituting the cylindrical case 33, and the opening 34 is provided with a particulate matter removal filter 41 (described later) with respect to the cylindrical case 33. In order to attach and detach in the radial direction, for example, upward and downward, the inside and outside of the cylindrical case 33 are communicated.

  Here, the opening 34 is formed by cutting out an intermediate portion in the axial direction of the cylindrical portion 33 </ b> A constituting the cylindrical case 33 in a semicircular shape from the upper surface to the axial center. As a result, an axially intermediate portion where the opening 34 is provided in the cylindrical portion 33A becomes a filter receiving portion 33F having a semicircular cross section, and the particulate matter removing filter 41 is moved from below by the filter receiving portion 33F. It becomes the structure which supports.

  Reference numerals 35 and 35 denote left and right case-side brackets provided on the outer peripheral side of the cylindrical portion 33A with the opening 34 interposed therebetween. Each of the case-side brackets 35 attaches a lid 37 which will be described later. Each case-side bracket 35 projects in the radial direction from the outer peripheral surface of the cylindrical portion 33A, and extends in the front and rear directions along the axial direction. The case-side bracket 35 is provided with a plurality of bolt insertion holes 35A penetrating upward and downward with a space in the front and rear directions, and the bottom surface of the case-side bracket 35 corresponding to each of the bolt insertion holes 35A. A nut 35B is welded to the side (see FIG. 9).

  Reference numerals 36 and 36 denote front and rear stoppers provided in the filter receiving portion 33F of the cylindrical portion 33A. The stoppers 36 each support the particulate matter removing filter 41 in the cylindrical case 33 of the filter cylinder 32. It is fixed in the direction. Here, each stopper 36 is formed as a semicircular plate, and the filter receiving portion 33F is faced in the front and rear directions with a slightly larger interval than the axial dimension of the particulate matter removal filter 41. It is fixed to the inner surface of the plate using means such as welding. Therefore, as shown in FIG. 8, the stoppers 36 are engaged with both ends of the particulate matter removal filter 41 in a state where the particulate matter removal filter 41 is disposed on the filter receiving portion 33 </ b> F of the cylindrical case 33. Thus, the particulate matter removal filter 41 can be fixed in the axial direction in the cylindrical case 33 of the filter cylinder 32.

  37 is a lid that covers the opening 34 formed in the cylindrical case 33 so that the opening 34 can be opened and closed. The lid 37 covers the opening 34 in a state where the particulate matter removal filter 41 is accommodated in the cylindrical case 33. It is a blockage. Here, as shown in FIGS. 7 to 9, the lid body 37 is formed as a plate body having a semicircular cross section that is bent with substantially the same curvature as the cylindrical portion 33A of the cylindrical case 33. In this case, the longitudinal dimension of the lid 37 is formed to be larger than the longitudinal dimension of the opening 34, and both ends in the longitudinal direction of the lid 37 are covered with the upper surface of the cylindrical portion 33 </ b> A at both ends of the cylindrical case 33. Is set. Further, at the lower end portion of the lid body 37, flat left and right lid body side brackets 37A and 37A facing the respective case side brackets 35 of the cylindrical case 33 are provided extending in the longitudinal direction. The body side bracket 37A is provided with a plurality of bolt insertion holes 37B penetrating upward and downward.

  38, 38, ... are bolts as fastening members provided between the cylindrical case 33 and the lid body 37 so as to be detachable. These bolts 38 are respectively connected to the bolt insertion holes 37B of the lid body side bracket 37A, It is inserted from above into the bolt insertion hole 35 </ b> A of the case side bracket 35 and is screwed into a nut 35 </ b> B fixed to the lower surface side of the case side bracket 35. Thus, the lid 37 can be detachably attached to the cylindrical case 33 using the bolts 38, and the opening 34 can be covered by the lid 37.

  Reference numerals 39 and 39 are front and rear stoppers provided on the lid 37. Each stopper 39 is formed as a semicircular arc plate and is slightly larger than the axial dimension of the particulate matter removal filter 41. It is fixed to the inner peripheral surface of the lid body 37 by means of welding or the like in a state of facing in the front and rear directions with an interval. Therefore, as shown in FIG. 8, the particulate matter removing filter 41 is disposed on the filter receiving portion 33 </ b> F of the cylindrical case 33, and each stopper 39 is in a particulate form with the lid 37 attached to the cylindrical case 33. By engaging the both ends of the substance removing filter 41, the particulate substance removing filter 41 can be fixed in the axial direction within the cylindrical case 33 of the filter cylinder 32.

  Reference numeral 40 denotes a gasket provided between the cylindrical case 33 and the lid 37, and the gasket 40 surrounds the opening 34 of the cylindrical case 33, and between the mounting surfaces of the cylindrical case 33 and the lid 37. Is hermetically sealed. Here, as shown in FIGS. 7 to 9, the gasket 40 is formed as a plate body having a semicircular cross section substantially the same as the lid body 37. The lower end portion of the gasket 40 is provided with plate-like left and right clamping portions 40A and 40A that are clamped between the case side bracket 35 of the cylindrical case 33 and the lid body side bracket 37A of the lid body 37. Each of the clamping portions 40A is provided with a plurality of bolt insertion holes 40B through which the bolts 38 are inserted. Further, portions of the gasket 40 corresponding to the stoppers 39 provided on the inner surface of the lid body 37 are provided with notches 40C and 40C through which the stoppers 39 are inserted, and the gaps between the notches 40C are thick. It is a meat part 40D (see FIG. 8).

  The gasket 40 is between the cylindrical portion 33A and the case side bracket 35 of the cylindrical case 33 and the lid 37 and the lid side bracket 37A in a state where the particulate matter removal filter 41 is accommodated in the cylindrical case 33. The lid 37 is fastened to the cylindrical case 33 using bolts 38, and the space between the mounting surfaces of the cylindrical case 33 and the lid 37 is hermetically sealed in a state of surrounding the opening 34. Stop. In this case, the thick portion 40D of the gasket 40 is disposed between the stoppers 39 of the lid 37, and this thick portion 40D contacts the outer peripheral surface of the particulate matter removal filter 41, thereby removing the particulate matter. The gap between the filter 41 and the lid 37 is closed.

  41 is a particulate matter removal filter (usually also called Diesel Particulate Filter, abbreviated as DPF) accommodated in the cylindrical case 33, and the particulate matter removal filter 41 constitutes one of the processing members. To do. 7 to 9, the particulate matter removing filter 41 includes a filter body 42 formed in a cylindrical shape by a porous member made of, for example, a ceramic material, and an outer peripheral side of the filter body 42. A buffer material layer 43 provided over the entire periphery and a heat insulating material layer 44 provided over the entire periphery on the outer peripheral side of the buffer material layer 43 are roughly configured.

  Here, the filter main body 42 is formed in a cellular structure having a honeycomb structure in which a large number of small holes 42A are provided in the axial direction, and each small hole 42A is alternately adjacent to each other by a plugging member 42B. It is blocked. The filter main body 42 collects particulate matter by passing the exhaust gas flowing into each small hole 42A from the upstream side through the porous material, and flows only the exhaust gas downstream through the adjacent small hole 42A. Let

  In this case, the particulate matter collected by the filter main body 42 is burned and removed, but part of it becomes ash and gradually accumulates in the small holes 42A. In addition, other unburned residues such as heavy metals and calcium in the engine oil are gradually deposited. Therefore, the pressure sensor 47 described later measures the pressure on the upstream side and the pressure on the downstream side of the particulate matter removal filter 41. When the pressure difference between the upstream side and the downstream side reaches a predetermined value, the particulate matter removal is performed. The filter 41 is removed from the cylindrical case 33 of the filter cylinder 32 to clean the deposits.

  45 is a plurality of bolts connecting the upstream cylinder 22 and the filter cylinder 32 and between the downstream cylinder 28 and the filter cylinder 32. These bolts 45 are connected to the upstream cylinder 22. The bolt insertion hole 23D provided in the flange portion 23C of the cylindrical case 23 to be configured and the bolt insertion hole 33D provided in the front flange portion 33B of the cylindrical case 33 constituting the filter cylinder 32 were inserted. By screwing the nut 46 in the state, the upstream cylinder 22 and the filter cylinder 32 are connected to each other so that they can be disassembled, and provided on the flange portion 29C of the cylindrical case 29 constituting the downstream cylinder 28. The nut 46 is screwed in a state of being inserted into the bolt insertion hole 29 </ b> D and the bolt insertion hole 33 </ b> E provided in the rear flange portion 33 </ b> C of the cylindrical case 33 constituting the filter cylinder 32. Ri is for degradable connection between the downstream cylinder 22 and the filter accommodating cylinder 32.

  47 is a pressure sensor provided on the outer peripheral side of the upstream cylindrical body 22, and the pressure sensor 47 is provided on the upstream side of the particulate matter removal filter 41 in order to estimate the accumulation amount of particulate matter, unburned residue and the like. And a downstream pressure (pressure difference) are detected. The upstream side piping 47A of the pressure sensor 47 is connected to the pressure extraction portion 23F of the cylindrical case 23 of the upstream cylindrical body 22, and the downstream side piping 47B is a pressure extraction portion 29E of the cylindrical case 29 of the downstream cylindrical body 28. It is connected to the.

  Reference numeral 48 denotes an upstream temperature sensor provided on the upstream side of the cylindrical case 23 of the upstream cylindrical body 22, and the upstream temperature sensor 48 is attached to a temperature sensor attachment port 23 </ b> E located on the upstream side of the cylindrical case 23. , Connected to a controller (not shown). The upstream temperature sensor 48 detects the temperature of the exhaust gas flowing into the cylindrical case 23 in order to confirm whether the temperature is such that the oxidation catalyst 25 can function.

  49 is a downstream temperature sensor provided on the downstream side of the cylindrical case 23 of the upstream cylinder 22, and this downstream temperature sensor 49 oxidizes (regenerates) the particulate matter collected by the particulate matter removal filter 41. In order to confirm whether or not this is possible, the temperature of the exhaust gas that has passed through the oxidation catalyst 25 is detected.

  The exhaust gas purifying device 21 according to the present embodiment has the above-described configuration. When the engine 8 is operated to perform excavation work or the like by the hydraulic excavator 1, particulate matter, Exhaust gas containing harmful substances such as nitrogen oxides is discharged, and this exhaust gas is introduced into the exhaust gas purification device 21 through the inflow pipe 24.

  At this time, when the exhaust gas passes through the oxidation catalyst 25 accommodated in the upstream cylinder 22, the exhaust gas purification device 21 includes carbon monoxide (CO), hydrocarbon (HC), etc. contained in the exhaust gas. Is oxidized and removed. When the exhaust gas that has passed through the oxidation catalyst 25 passes through the particulate matter removal filter 41 accommodated in the filter cylinder 32, the exhaust gas is converted into exhaust gas by the filter body 42 of the particulate matter removal filter 41. The particulate matter contained is collected, and the collected particulate matter is removed by combustion (regeneration).

  In this way, the exhaust gas purified by the exhaust gas purification device 21 is silenced by the silencer cylinder 30B of the outflow pipe 30 in the downstream cylinder 28 and then discharged to the outside through the outflow pipe 30.

  As described above, the particulate matter collected by the filter body 42 of the particulate matter removal filter 41 is burned and removed, but a part thereof becomes ash and gradually enters the small holes 42A of the filter body 42. accumulate. In addition, other unburned residues such as heavy metals and calcium in the engine oil are gradually deposited.

  For this reason, the pressure sensor 47 measures the pressure difference between the upstream side and the downstream side of the particulate matter removal filter 41, and when this pressure difference reaches a predetermined value, the particulate matter removal filter 41 is filtered. It is necessary to remove the deposit from the cylindrical case 33 of the body 32 and clean the deposit.

  Therefore, a cleaning operation for removing the particulate matter deposited on the particulate matter removal filter 41 will be described.

  When performing this cleaning operation, first, the bolts 38 that fasten the lid body 37 to the cylindrical case 33 of the filter cylinder 32 are removed from the nuts 35B fixed to the case-side bracket 35 of the cylindrical case 33. Pull out upward. Thereby, the cover body 37 and the gasket 40 can be removed upward from the cylindrical case 33, and the opening part 34 of the cylindrical case 33 can be open | released.

  At this time, the particulate matter removal filter 41 is merely placed on the filter receiving portion 33 </ b> F of the cylindrical case 33, and the upper half of the particulate matter removal filter 41 passes through the opening portion 34. Exposed outside. Therefore, the operator grasps the upper half of the particulate matter removal filter 41 and lifts it upward, so that only the particulate matter removal filter 41 can be easily separated from the outside of the cylindrical case 33 through the opening 34. Can be removed.

  In this way, only the particulate matter removing filter 41 is taken out through the opening 34 by simply removing the lid 37 from the cylindrical case 33 while the filter cylinder 32 is connected to the upstream cylinder 22 and the downstream cylinder 28. be able to.

  In this case, since the particulate matter removal filter 41 can be removed upward through the opening 34 of the cylindrical case 33, the exhaust gas purifying device 21 together with the mounted equipment such as the engine 8 and the hydraulic pump 10, the building cover 15 Even when it is arranged in a narrow space inside, the worker can safely and easily take out only the particulate matter removal filter 41 from the cylindrical case 33 without being disturbed by other mounted devices. it can.

  Then, compressed air is blown onto the filter body 42 of the removed particulate matter removal filter 41 using, for example, an air gun to remove the particulate matter ash and unburned residue accumulated in the small holes 42A. The particulate matter removal filter 41 can be cleaned.

  After the particulate matter removing filter 41 is cleaned in this way, the particulate matter removing filter 41 is placed on the filter receiving portion 33F of the cylindrical case 33 through the opening 34, and the gasket 40 and the lid 37 are placed. Are fastened to the case-side bracket 35 of the cylindrical case 33 using bolts 38. Accordingly, the opening 34 can be covered with the lid 37, and the space between the mounting surfaces of the cylindrical case 33 and the lid 37 can be hermetically sealed with the gasket 40.

  In this case, the front and rear stoppers 36 are provided on the inner side surface of the filter receiving portion 33F constituting the cylindrical case 33, and the front and rear stoppers 39 are provided on the inner side surface of the lid 37. The particulate matter removing filter 41 is mounted in the cylindrical case 33, and the stoppers 36 and 39 are arranged in the axial direction of the particulate matter removing filter 41 in a state where the opening 34 of the cylindrical case 33 is covered with the lid 37. Engage with both ends. Thereby, the particulate matter removing filter 41 can be fixed at an appropriate position in the filter cylinder 32 simply by attaching the particulate matter removing filter 41 that has been subjected to the cleaning operation or the like in the tubular case 33. Appropriate operation of the particulate matter removal filter 41 after cleaning can be ensured.

  Thus, according to the present embodiment, the filter cylinder 32 having the upstream cylinder 22 connected to the front side in the front and rear directions and the downstream cylinder 28 connected to the rear side is removed. Since the cylindrical case 33 that accommodates the filter 41, the opening 34 formed on the upper surface side of the cylindrical case 33, and the lid 37 that covers the opening 34 so as to be opened and closed, the cylindrical case 33 is provided. The opening 34 can be opened by removing the lid 37 from the base.

  For this reason, only the particulate matter removal filter 41 is independently connected while the cylindrical case 33 of the filter cylinder 32 is connected to the cylindrical case 23 of the upstream cylinder 22 and the cylindrical case 29 of the downstream cylinder 28. It can be removed from the cylindrical case 33 through the opening 34. As a result, when performing a cleaning operation, an inspection operation, a repair operation or the like for the particulate matter removal filter 41, a complicated pre-operation such as removing the upstream cylinder 22 and the downstream cylinder 28 connected to the filter cylinder 32 is performed. This can be eliminated, and the workability when performing a cleaning operation or the like can be improved.

  Moreover, since the particulate matter removal filter 41 can be attached to and removed from the cylindrical case 33 in the upward and downward directions through the opening 34, the exhaust gas purifying device 21 can be used for the engine 8, the hydraulic pump 10, and the like. Even when it is arranged in a narrow space in the building cover 15 together with the mounted equipment, the operator can attach the particulate matter removal filter 41 to the cylindrical case 33 without being disturbed by other mounted equipment. The removal work can be performed safely and easily.

  The lid 37 is attached to the cylindrical case 33 using bolts 38, and the gasket 40 is provided between the lid 37 and the cylindrical case 33 so as to surround the opening 34. The lid 37 can be easily removed simply by removing 38 from the case side bracket 35 of the cylindrical case 33. On the other hand, after the cleaned particulate matter removal filter 41 is disposed in the cylindrical case 33, the gasket 40 and the lid 37 are fastened to the case side bracket 35 of the cylindrical case 33 using the bolts 38. The opening 34 can be covered with the lid 37, and the mounting surface between the cylindrical case 33 and the lid 37 can be hermetically sealed with the gasket 40. As a result, the exhaust gas introduced into the filter cylinder 32 does not leak to the outside through the gap between the mounting surfaces of the cylindrical case 33 and the lid body 37, and the exhaust gas is reliably transferred to the particulate matter removal filter 41. Can lead to.

  Further, since the stopper 36 is provided on the inner side surface of the filter receiving portion 33F constituting the cylindrical case 33 and the stopper 39 is provided on the inner side surface of the lid 37, the particulate matter removing filter 41 is placed inside the cylindrical case 33. The particulate matter removing filter 41 can be fixed at an appropriate position in the filter cylinder 32 simply by attaching to the filter cylinder 32, and the proper operation of the particulate matter removing filter 41 after cleaning can be ensured.

  In the above-described embodiment, the case side bracket 35 provided in the cylindrical case 33 is provided with a plurality of bolt insertion holes 35A penetrating upward and downward, and the lid body side bracket 37A of the lid body 37 has an upper side. A description will be given by taking as an example a configuration in which a plurality of bolt insertion holes 37B penetrating downward are provided, and the lid 37 is attached to and removed from the cylindrical case 33 by inserting and removing the bolts 38 upward and downward. is doing.

  However, the present invention is not limited to this. For example, as in the modification shown in FIG. 11, the block-like left and right case side brackets 51 are fixed to the cylindrical case 33 with the opening 34 interposed therebetween, and these A plurality of female screw holes 51A extending in the left and right directions are screwed in each case side bracket 51, and a plurality of bolt insertion holes 52B penetrating in the left and right directions are provided in the lid body side bracket 52A of the lid body 52. The lid 52 may be attached to and removed from the cylindrical case 33 by inserting and removing the bolt 38 left and right with respect to the bolt insertion hole 52B and the female screw hole 51A.

  In the above-described embodiment, the particulate matter removal filter 41 is used as a processing member for purifying the exhaust gas, and the opening 34 and the lid are formed in the cylindrical case 33 that accommodates the particulate matter removal filter 41. 37, the configuration in which the particulate matter removing filter 41 can be easily attached and removed from the cylindrical case 33 during the cleaning operation is illustrated.

  However, the present invention is not limited to this. For example, when a NOx purification device is applied as an exhaust gas purification device, a selective reduction catalyst that reduces NOx, and urea water injection that injects urea water into the selective reduction catalyst The valve corresponds to the processing member. In this case, an opening and a lid that covers the opening so as to be openable and closable are respectively provided in the cylindrical casing that houses the selective reduction catalyst and the cylindrical casing that houses the urea water injection valve. The configuration. Therefore, when removing the deposits attached to the selective reduction catalyst and urea water injection valve, the selective reduction catalyst and urea water injection valve can be removed independently by removing the lid from the cylindrical casing. Similar to the cleaning operation of the substance removal filter 41, it is possible to improve the workability when cleaning the selective reduction catalyst and the urea water injection valve.

  Furthermore, in the above-described embodiment, the case where the exhaust gas purification device 21 is mounted on the hydraulic excavator 1 including the crawler type lower traveling body 2 has been described as an example. However, the present invention is not limited to this, and may be configured to be mounted on a hydraulic excavator including a wheel-type lower traveling body made of, for example, a tire. Besides, it can be widely mounted on other construction machines such as lift trucks and hydraulic cranes.

1 is a front view showing a hydraulic excavator provided with an exhaust gas purification device according to an embodiment of the present invention. It is a top view which expands and shows an upper revolving body in the state which omitted the cab and the building cover. It is a perspective view of the principal part expansion shown in the state which attached the exhaust gas purification apparatus to the engine. It is a front view which shows an exhaust-gas purification apparatus with a hydraulic pump. It is a perspective view which shows an exhaust-gas purification apparatus alone. It is a perspective view which shows the state which removed the cylinder for filters from the upstream cylinder and the downstream cylinder. It is a disassembled perspective view which shows the cylindrical case of a cylinder for a filter, a gasket, a cover body, and a particulate matter removal filter. It is a longitudinal cross-sectional view which shows the internal structure of an exhaust-gas purification apparatus. It is the cross-sectional view which expanded the internal structure of the exhaust gas purification apparatus from the arrow IX-IX direction in FIG. FIG. 5 is an enlarged cross-sectional view of a main part when a state in which an upstream cylinder is attached to a purification device support bracket is viewed from the direction of arrows XX in FIG. 4. It is a disassembled perspective view similar to FIG. 7 which shows the modification of a cover body.

Explanation of symbols

1 Hydraulic excavator 2 Lower traveling body (vehicle body)
4 Upper swing body (car body)
8 Engine 9 Exhaust pipe (exhaust gas passage)
21 Exhaust gas purification device 22 Upstream cylinder 25 Oxidation catalyst (processing member)
28 Downstream cylinder 32 Filter cylinder (purification section cylinder)
33 Cylindrical case 34 Opening 36, 39 Stopper 37, 52 Lid 38 Bolt (fastening member)
40 Gasket 41 Particulate matter removal filter (processing member)
42 Filter body

Claims (2)

An upstream cylinder provided in an exhaust gas passage of an engine mounted on the vehicle body, a downstream cylinder provided on the downstream side of the upstream cylinder, and a series connection between the upstream cylinder and the downstream cylinder And a purification unit cylinder in which a processing member for purifying exhaust gas is provided ,
The said purification | cleaning part cylinder is formed in the cylindrical case which accommodates the said processing member in the inside, the opening part which attaches and removes the said processing member formed in the upper surface side of this cylindrical case, and can open and close this opening part In the exhaust gas purification apparatus configured by a cover body covered with
The cylindrical case includes a cylindrical portion in which the opening is formed at an axial intermediate portion by cutting the upper surface side into a semicircular shape, and a radial direction from the outer peripheral side of the cylindrical portion across the opening. Left and right case-side brackets provided in a protruding manner, front and rear stoppers provided on the inner peripheral surface of the cylindrical portion so as to be spaced apart in the front and rear directions and fixing the processing member in the axial direction; Consisting of
The lid body is set to have a longitudinal dimension larger than the longitudinal dimension of the opening so as to cover the opening, and has a semicircular cross-sectional shape that covers the upper surface of the cylindrical part at both ends of the cylindrical case. The left and right lid-side brackets facing the case-side brackets of the cylindrical case are provided at the lower end, and the processing member is provided in the axial direction and spaced apart in the front and rear directions. A structure is provided with front and rear stoppers on the lid side to be fixed.
Between the lid and the cylindrical case, a gasket is provided surrounding the opening,
The gasket is sandwiched between a notch portion through which the stopper is inserted in a portion corresponding to the stopper on the lid body side, and each case side bracket of the cylindrical case and each lid body side bracket of the lid body. With left and right clamping parts,
The gasket is disposed between the cylindrical portion and the case side bracket of the cylindrical case, and the lid and the lid side bracket in a state where the processing member is accommodated in the cylindrical case through the opening. In a state where the processing member is disposed and covered with the lid and the gasket, each case-side bracket of the cylindrical case, each lid-side bracket of the lid, and each clamping part of the gasket are used as fastening members. An exhaust gas purifying device characterized by being configured to be fastened . A thick portion is formed between the notches of the gasket, and the thick portion is disposed between the stoppers on the lid side when the lid is fastened to the cylindrical case, part exhaust gas purifying apparatus according to claim 1 comprising a structure you close the gap between the processing member and the lid member by coming into contact with the outer peripheral surface of the processing member.

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