JP2014070492A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce temperature of exhaust gas discharged from a drainage tool provided in an exhaust gas treatment device.SOLUTION: In a hydraulic shovel 1, an exhaust gas treatment device 17 is provided for purifying exhaust gas discharged from an engine 7 and for absorbing sound, and on a lower vertical side in an outlet port 22c side of the exhaust gas treatment device 17, a drainage tool 28 is provided for discharging moisture accumulated in the exhaust gas treatment device 17 to the outside of a vehicle body. The drainage tool 28 includes an upper cylindrical body 29 having a bottomed cylindrical shape, and a lower cylindrical body 30 fixed to the lower side of the upper cylindrical body 29. The upper cylindrical body 29 has, on an inner peripheral surface 29D thereof, a partition member 31 for partitioning the upper cylindrical body 29 into an upper side chamber S1 and a lower side chamber S2. The partition member 31 has two communication holes 32 at a position vertically different from an opening 29C provided at a bottom part 29B of a cylindrical part 29A of the upper cylindrical body 29, allowing the upper side chamber S1 and the lower side chamber S2 to communicate with each other.

Description

  The present invention relates to a construction machine including an exhaust gas processing device such as a hydraulic excavator and a hydraulic crane, and more particularly to a construction machine including a water drainer that discharges moisture accumulated inside the exhaust gas processing device to the outside of a vehicle body.

  In general, a hydraulic excavator as a typical example of a construction machine is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an uplifting motion on the front side of the upper revolving body. It is roughly constituted by a work device provided so as to perform excavation work such as earth and sand using the work device.

  Here, the upper swing body of the hydraulic excavator is normally a counterweight that forms a support structure and has a work frame provided on the front side, and a counterweight that balances the weight of the work device provided on the rear side of the swing frame. A driver's seat disposed on the left side of the front portion of the turning frame, an engine mounted on the turning frame located on the front side of the counterweight, and exhaust gas provided in connection with the engine and exhausted from the engine And an exhaust pipe for exhaust gas exhausted from the engine provided in the middle of the exhaust pipe.

  In this case, the exhaust gas treatment device normally includes an oxidation catalyst for oxidizing and removing nitrogen monoxide (NO), carbon monoxide (CO), hydrocarbon (HC), etc. in the exhaust gas, and the exhaust gas. A filter (DPF: Diesel Particulate Filter) and a silencer that reduces exhaust noise are provided to remove harmful substances contained in the exhaust gas, and then exhaust the exhaust gas to the outside of the excavator It is configured to discharge.

  On the other hand, a silencer (muffler) that constitutes an exhaust gas treatment device includes a tail pipe that exhausts exhaust gas to the outside of a hydraulic excavator after performing the silence process. For this reason, the muffler is provided with a drainage device that guides rainwater that has entered through the tail pipe and moisture condensed in the muffler to the outside of the hydraulic excavator, and a drain pipe is connected to the drainage device ( For example, see Patent Document 1).

JP 2010-163881 A

  By the way, the exhaust gas treatment apparatus that performs the exhaust gas purification process and the silencing process described above forcibly raises the temperature of the exhaust gas in order to burn and remove the particulate matter collected by the filter. . Most of the exhaust gas whose temperature has risen rapidly is discharged to the outside of the vehicle body through the tail pipe, but a part of the exhaust gas flows into the drainage tool.

  Then, when this hot exhaust gas distribute | circulates the drain pipe which consists of rubber | gum, a resin material, etc. which were connected to the drain, for example, the said drain pipe was thermally deteriorated, or it was arrange | positioned in the vicinity of the drain pipe There is a problem in that peripheral components such as an anti-vibration rubber of the engine may be thermally deteriorated.

  Accordingly, it is conceivable to use a drain pipe through which high-temperature exhaust gas flows, for example, instead of a heat-resistant steel pipe that is not easily affected by heat. However, parts such as hydraulic pumps provided in the engine and anti-vibration rubber for the engine are complicated around the drainage and drainage pipes. A steel pipe with low flexibility is installed in this narrow space. There is a problem that it is difficult to arrange.

  The present invention has been made in view of the above-described problems of the prior art, and suppresses the thermal influence of the exhaust gas on the drainage pipe connected to the drainage tool and the peripheral parts of the drainage pipe, and the like. It is an object of the present invention to provide a construction machine that can reliably guide moisture accumulated in the outside of the vehicle body.

  A construction machine according to the present invention includes a self-propelled vehicle body, an engine mounted on the vehicle body and having an exhaust port, an exhaust pipe connected to the exhaust port of the engine, and a casing provided connected to the exhaust pipe. An exhaust gas processing apparatus having an outlet for discharging the treated exhaust gas to the outside, and a water draining tool connected to the exhaust gas processing apparatus and for discharging moisture accumulated in the exhaust gas processing apparatus to the outside of the vehicle body And comprising.

  And in order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the drainage tool has an upper end side on the outlet side of the exhaust gas treatment device and a casing of the exhaust gas treatment device. A bottomed cylindrical upper cylinder connected to a lower position in the upper and lower directions and having an opening at the bottom of the cylinder, and provided below the upper cylinder in communication with the opening at the bottom of the upper cylinder A lower cylindrical body, a partition member provided on an inner peripheral surface of the upper cylindrical body and partitioning the upper cylindrical body into an upper chamber and a lower chamber, and upward and downward with respect to an opening at the bottom of the upper cylindrical body There is a configuration in which the partition member is provided with a communication hole provided at a different position to communicate the upper chamber and the lower chamber.

  According to a second aspect of the present invention, the opening of the upper cylinder is formed at the center of the bottom of the upper cylinder, and the communication hole is provided between the inner peripheral surface of the cylinder of the upper cylinder and the partition member. It is in forming.

  According to a third aspect of the present invention, the inner diameter of the upper cylinder is formed larger than the inner diameter of the lower cylinder, and a drain pipe that guides the moisture to the outside of the vehicle body is provided at the lower end of the lower cylinder. This is because the roads are connected.

  According to a fourth aspect of the present invention, an oxidation catalyst for oxidizing components in exhaust gas discharged from the engine and particulate matter contained in the exhaust gas are collected in the exhaust gas treatment device. A configuration in which one or a plurality of processing devices out of processing devices consisting of a filter and a silencer that silences exhaust gas of the exhaust gas is provided, and the water draining tool is located on the most downstream side. A configuration is provided between the processing equipment and the exhaust gas outlet.

  According to the first aspect of the present invention, the flow rate of the exhaust gas flowing into the lower cylindrical body by the partition member provided on the inner peripheral surface of the upper cylindrical body constituting the water drainage tool and the communication hole provided in the partition member. Is squeezed. Further, the communication hole and the opening provided at the bottom of the upper cylindrical body are provided at different positions in the upward and downward directions. That is, the communication hole and the opening do not penetrate in a straight line in the upward and downward directions, and the exhaust gas flow path is bent between the upper cylindrical body and the lower cylindrical body.

  Thereby, since the flow rate at which the exhaust gas in the high temperature state is discharged from the drainage device can be reduced, the temperature of the exhaust gas in the high temperature state can be cooled (reduced) at an early stage. It is possible to suppress thermal degradation of peripheral components. Further, the water accumulated in the exhaust gas treatment device can be reliably discharged to the outside through the communication hole of the partition member, the opening of the upper cylinder, and the lower cylinder.

  According to the invention of claim 2, the exhaust gas flow path can be greatly bent from the inner peripheral surface of the cylindrical portion of the upper cylindrical body to the central portion. The flow rate to be used can be reduced efficiently.

  According to the invention of claim 3, since the inner diameter dimension of the upper cylinder body is formed larger than the inner diameter dimension of the lower cylinder body, it is possible to improve the drainage of moisture accumulated in the exhaust gas treatment device. Since the flow rate of the exhaust gas flowing out from the water drainage tool can be suppressed, the stability and reliability of the construction machine can be improved. Further, exhaust gas and moisture can be guided to the outside of the vehicle body by the drain pipe connected to the lower end of the lower cylinder.

  According to the invention of claim 4, the exhaust gas treatment device is provided with one or a combination of a plurality of treatment devices among treatment devices comprising an oxidation catalyst, a filter and a silencer, and this exhaust gas treatment device. The drainage tool is provided on the exhaust gas outlet side, which is the most downstream side.

  As a result, rainwater that has entered through the tail pipe and moisture condensed in the exhaust gas treatment device can be reliably guided to the outside of the vehicle body. Further, for example, the exhaust gas that has reached a high temperature for burning the particulate matter collected by the filter can reduce the flow rate discharged from the water drainage tool. It is possible to improve the stability and reliability of the construction machine.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. It is a top view which shows a turning frame, an engine, an exhaust-gas processing apparatus, etc. It is a side view showing a revolving frame, an engine, a hydraulic pump, a vibration proof rubber, an exhaust gas processing device, a drainage tool, a drain pipe, and the like. FIG. 4 is a rear view of the turning frame, the engine, the hydraulic pump, the anti-vibration rubber, the exhaust gas treatment device, the water drainage tool, the drain pipe line, and the like seen from the direction of arrows IV-IV in FIG. It is a side view shown in the state where the principal parts, such as the exhaust-gas processing apparatus in FIG. It is a perspective view which shows a water drain tool alone. It is the top view which looked at the drainage tool from the upper direction of FIG. It is sectional drawing which looked at the drainage tool from the arrow VIII-VIII direction in FIG. It is sectional drawing which shows the flow direction of exhaust gas while seeing a draining tool from the arrow IX-IX direction in FIG. It is a side view similar to FIG. 5 which shows the drain pipe by a 1st modification. It is a perspective view which shows the water draining tool by a 2nd modification.

  Hereinafter, a case where an embodiment of a construction machine according to the present invention is applied to a hydraulic excavator will be described as an example, and will be described in detail with reference to FIGS. 1 to 9.

  Reference numeral 1 denotes a canopy-spec small hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a crawler-type lower traveling body 2 having left and right crawlers (crawler belts) 2A, and the lower traveling body 2 The upper swing body 3 mounted on the top of the upper swing body 3 and a swing type work device 4 provided on the front side of the upper swing body 3 are roughly configured, and the work device 4 performs excavation work of earth and sand. Is.

  Here, the upper swing body 3 has a width dimension in the left and right directions substantially equal to the vehicle width of the lower traveling body 2 (the distance between the left and right crawlers 2A), and is formed in a substantially circular shape when viewed from above. Yes. As a result, the excavator 1 is a small rear turning type in which the rear surface of the counterweight 6 (described later) is substantially within the vehicle width of the lower traveling body 2 when the upper revolving body 3 performs the turning operation on the lower traveling body 2. It is configured as a hydraulic excavator.

  The upper swing body 3 includes a swing frame 5, a counterweight 6, an engine 7, an exterior cover 15, and the like which will be described later.

  Reference numeral 5 denotes a revolving frame that serves as a base of the upper revolving structure 3. As shown in FIG. 2, the revolving frame 5 includes a thick flat plate-like bottom plate 5A that extends forward and rearward in the center in the left and right directions. A left vertical plate 5B and a right vertical plate 5C which are erected on the upper surface side of the bottom plate 5A and extend in the front and rear directions, and a support bracket 5D provided at the front end of the left and right vertical plates 5B and 5C. A substantially arc-shaped left frame member 5E provided on the left side of the bottom plate 5A and a substantially arc-shaped right frame member 5F provided on the right side of the bottom plate 5A are roughly configured to form a strong support structure. .

  The working device 4 is attached to the support bracket 5D located on the front end side of the revolving frame 5, and a counterweight 6 described later is attached to the rear end side of the bottom plate 5A constituting the revolving frame 5. An insertion hole 5A1 through which a drain pipe 33 (described later) is inserted and fixed below the exhaust gas processing device 17 (described later) on the rear side of the bottom plate 5A is provided in the thickness direction (upward and downward) of the bottom plate 5A. It is provided through.

  Reference numeral 6 denotes a counterweight provided on the rear end side of the revolving frame 5, and the counterweight 6 is made of a heavy object integrally formed by using, for example, a casting means, and balances the weight with the work device 4. . The counterweight 6 extends in a substantially arc shape in the left and right directions at a position surrounding an engine 7 described later from the rear side.

  Reference numeral 7 denotes an engine mounted on the front surface side of the counterweight 6, and the engine 7 is disposed on the revolving frame 5 in a laterally extending state via an elastic vibration-proof rubber 8 having elasticity. A hydraulic pump 9 is disposed on the left side of the engine 7, and the hydraulic pump 9 is driven by the engine 7 to supply operating hydraulic oil to various hydraulic actuators mounted on the excavator 1. To do. On the other hand, a heat exchanger 10 such as a radiator or an oil cooler is disposed on the right side of the engine 7, and the heat exchanger 10 cools the engine by cooling air sucked by a cooling fan (not shown) of the engine 7. It cools fluids such as water and hydraulic oil. Further, the engine 7 is provided with an exhaust port 7A for connecting an exhaust pipe 11 described later.

  An exhaust pipe 11 is connected to the exhaust port 7A of the engine 7, and the exhaust pipe 11 exhausts exhaust gas discharged from the engine 7 to the outside. Here, an exhaust gas processing device 17 described later is provided on the exhaust port 11A side of the exhaust pipe 11. The exhaust gas discharged from the engine 7 is subjected to purification processing, silencing processing, and the like by the exhaust gas processing device 17 and then discharged to the outside of the hydraulic excavator 1.

  Reference numeral 12 denotes a driver's seat on which an operator of the hydraulic excavator 1 is seated. Work levers 13 for operating the work device 4 and the like are disposed on the left and right sides of the driver's seat 12. Further, a traveling lever / pedal 14 is provided in front of the driver's seat 12. Further, on the upper side of the driver's seat 12, a canopy 12 </ b> A that protects an operator seated on the driver's seat 12 from rainwater or the like is provided.

  An exterior cover 15 is provided on the revolving frame 5, and the exterior cover 15 constitutes a building of the upper revolving structure 3 together with the counterweight 6. Here, the exterior cover 15 includes a left side cover 15A as a side cover extending forward from the left end side of the counterweight 6 and a left side cover provided so as to cover the periphery of the revolving frame 5 from the tip of the left side cover 15A. A skirt cover 15B, a right side cover (not shown) extending forward from the right end side of the counterweight 6, and a right skirt cover (see FIG. 5) provided so as to cover the periphery of the turning frame 5 from the tip of the right side cover. (Not shown) and an openable / closable tank cover (not shown) located on the right side and covering the hydraulic oil tank or the like.

  A device storage chamber 16 surrounded by a counterweight 6, an outer cover 15 and the like is defined inside the upper swing body 3, and in this device storage chamber 16, an engine 7, a hydraulic pump 9, a heat exchange unit are formed. Internal equipment such as the vessel 10 and an exhaust gas treatment device 17 described later is accommodated.

  Here, the left side cover 15 </ b> A has a configuration that can be opened and closed when maintaining internal devices including the engine 7. For this purpose, the left side cover 15A is detachably attached to the turning frame 5 and the like.

  Next, an exhaust gas processing device 17 that purifies and silences exhaust gas discharged from the engine 7 will be described.

  An exhaust gas processing device 17 is connected to the exhaust pipe 11, and the exhaust gas processing device 17 performs a purification process and a muffling process on the exhaust gas discharged from the engine 7. Here, the exhaust gas processing device 17 is supported by a pair of support brackets 18 fixed to the engine 7 and is disposed above the hydraulic pump 9 with the axial direction aligned with the front and rear directions. The exhaust gas processing device 17 is roughly constituted by a casing 19, which will be described later, an oxidation catalyst 25, a filter 26, and a tail pipe 27.

  Reference numeral 19 denotes a casing that forms an outer shell of the exhaust gas treatment device 17, and the casing 19 is configured by fastening three cylinders of an upstream cylinder 20, an intermediate cylinder 21, and a downstream cylinder 22 with bolts and nuts 23. It is comprised by.

  Here, the upstream cylindrical body 20 constitutes an inlet portion into which exhaust gas discharged from the engine 7 through the exhaust pipe 11 flows, and the upstream cylindrical body 20 includes a cylindrical main body portion 20A, A closing plate portion 20B attached to one end side of the main body portion 20A using bolts and nuts 24 in order to close one end side opening (opening on the left end side in FIG. 5) of the main body portion 20A, and the other end side of the main body portion 20A And a flange portion 20C provided in the opening (opening on the right end side in FIG. 5). An exhaust port 11 </ b> A of the exhaust pipe 11 is connected to the upstream cylinder 20, and an oxidation catalyst 25 described later is accommodated in the upstream cylinder 20.

  On the other hand, the intermediate cylinder 21 includes a cylindrical main body portion 21A and flange portions 21B and 21C provided on both ends of the main body portion 21A. A filter 26 is accommodated.

  The downstream cylindrical body 22 includes a bottomed cylindrical main body portion 22A and a flange portion 22B provided on the opening side of the main body portion 22A. An outlet 22C for allowing exhaust gas to flow out of the vehicle body is formed at the upper and lower upper positions of the main body 22A, and a tail pipe 27 described later is provided in the outlet 22C in the vertical direction (upper, It is attached so as to extend in the downward direction. On the other hand, a drain port 22D for discharging moisture accumulated in the exhaust gas processing device 17 to the outside is formed at the upper and lower positions of the main body 22A. The drain port 28D has a drainer 28 to be described later. Is connected.

  Reference numeral 25 denotes an oxidation catalyst provided in the upstream cylinder 20. The oxidation catalyst 25 oxidizes and removes nitrogen monoxide (NO), carbon monoxide (CO), hydrocarbon (HC), etc. contained in the exhaust gas. To do.

  Reference numeral 26 denotes a filter (particulate matter removal filter) called DPF (Diesel Particulate Filter) provided in the intermediate cylinder 21. The filter 26 collects particulate matter (PM) contained in the exhaust gas. This purifies the exhaust gas. Further, the filter 26 detects the upstream side (front side) pressure and the downstream side (rear side) pressure by a pressure sensor, and forcibly adjusts the temperature of the exhaust gas when the pressure difference reaches a predetermined value. It is configured to raise and burn and remove particulate matter.

  Reference numeral 27 denotes a tail pipe connected to the downstream side of the exhaust gas processing device 17, and the tail pipe 27 discharges (releases) the purified exhaust gas to the outside of the vehicle body. The tail tube 27 communicates with the silencer 27A that extends upward and downward in the downstream cylinder 22 and projects from the downstream cylinder 22, and the upper end projects from the upper swing body 3 to exhaust gas. And an outflow pipe 27C for discharging the air to the atmosphere. The muffler 27A is provided with a large number of small holes 27B, and exhaust gas is reduced by passing exhaust gas through the small holes 27B.

  Next, the drainage tool 28 and the drainage pipe line 33 connected to the drainage tool 28 according to the present embodiment will be described.

  Reference numeral 28 denotes a water draining tool connected to the exhaust gas treatment device 17. This drainer 28 discharges moisture accumulated in the exhaust gas treatment device 17 to the outside of the vehicle body and suppresses the exhaust gas flowing in the exhaust gas treatment device 17 from flowing into the drain pipe 33. . Here, the water draining tool 28 is roughly constituted by an upper cylindrical body 29, a lower cylindrical body 30, a partition member 31, and a communication hole 32.

  Reference numeral 29 denotes an upper cylinder whose upper end is connected to the drain port 22D of the exhaust gas treatment device 17. The upper cylindrical body 29 is formed in a bottomed cylindrical shape by a cylindrical cylindrical portion 29A having an inner diameter dimension A and a bottom portion 29B that closes the lower end side of the cylindrical portion 29A. The upper end side of the cylindrical portion 29A is fixed to the casing 19 of the exhaust gas processing device 17 using means such as welding. In the center of the bottom portion 29B, an opening 29C penetrating the bottom portion 29B upward and downward is formed. The opening 29C is formed to have a size that allows moisture to sufficiently flow down. Further, a partition member 31 described later is fixed to the inner peripheral surface 29D of the upper cylinder 29 (cylinder portion 29A).

  Reference numeral 30 denotes a lower cylindrical body provided on the lower side of the upper cylindrical body 29. The lower cylindrical body 30 has a cylindrical shape having an inner diameter dimension B in which both end sides in the upper and lower directions (length direction) are open ends. The cylindrical body is formed. The upper end side of the lower cylindrical body 30 is fixed to the bottom portion 29B of the upper cylindrical body 29 using means such as welding, and the opening end on the upper end side of the lower cylindrical body 30 is the opening of the bottom portion 29B of the upper cylindrical body 29. It communicates with 29C.

  Reference numeral 31 denotes a partition member provided on the inner peripheral surface 29D of the upper cylindrical body 29. The partition member 31 is a substantially disk-shaped thin plate material that partitions the interior of the upper cylindrical body 29 upward and downward. The outer peripheral surface 31A is fixed to the inner peripheral surface 29D of the upper cylindrical body 29 by welding or the like. By this partition member 31, the inside of the upper cylindrical body 29 is divided into two chambers, an upper chamber S1 and a lower chamber S2, and the exhaust gas that has flowed into the upper chamber S1 can easily flow into the lower chamber S2. It is preventing.

  Reference numeral 32 denotes a communication hole provided in the partition member 31, and the communication hole 32 is provided in the partition member 31 at different positions in the upper and lower directions with respect to the opening 29 </ b> C of the bottom 29 </ b> B of the upper cylinder 29. The 29 upper chambers S1 and the lower chamber S2 communicate with each other. As shown in FIGS. 6 to 9, in the present embodiment, the partition member 31 is provided with two communication holes 32. Specifically, each communication hole 32 is formed by cutting the outer peripheral surface 31 </ b> A of the partition member 31 into a substantially half-moon shape, whereby the inner peripheral surface 29 </ b> D of the cylindrical portion 29 </ b> A of the upper cylindrical body 29 is separated from the partition hole 31. A communication hole 32 is formed between the member 31 and the member 31.

  The communication hole 32 is formed in such a size that the water can sufficiently flow down, whereby the water that has flowed down into the upper chamber S1 can flow down to the lower chamber S2 through the communication hole 32. Further, the flow rate of the exhaust gas flowing into the upper chamber S1 into the lower chamber S2 can be suppressed by the communication hole 32 having a smaller hole diameter than the inner diameter A of the cylindrical portion 29A of the upper cylindrical body 29. ing.

  Further, as shown in FIGS. 7 and 9, each communication hole 32 and the opening 29 </ b> C of the bottom 29 </ b> B do not penetrate in a straight line in the upward and downward directions. That is, each communication hole 32 is formed at a position eccentric to the outside in the radial direction with respect to the hole center line of the opening 29C, and the communication hole 32 and the opening 29C are formed without overlapping in plan view. As a result, the exhaust gas flow path from the upper chamber S1 of the upper cylinder 29 to the lower cylinder 30 via the lower chamber S2 can be bent as shown by the arrow F in FIG. The exhaust gas that has flowed into the side chamber S1 has a configuration that can further suppress the flow rate at which the exhaust gas flows into the lower chamber S2.

  Reference numeral 33 denotes a drain pipe connected to the lower end of the lower cylinder 30, and the drain pipe 33 transfers moisture flowing through the upper cylinder 29 and the lower cylinder 30 from the exhaust gas processing device 17 to the outside of the vehicle body. It is a guide. The drainage pipe 33 is configured as a flexible pipe using, for example, flexible rubber or resin material, and the upper end side is attached to the lower cylinder 30 by the clamp 34, and the lower end side is inserted through the insertion hole 5A1 of the bottom plate 5A. It protrudes below the revolving frame 5 (bottom plate 5A).

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. When performing excavation work or the like using the hydraulic excavator 1, first, the engine 7 is operated to drive the hydraulic pump 9.

  In this state, an operator seated in the driver's seat 12 operates the traveling lever / pedal 14 to cause the lower traveling body 2 to self-propel and move the hydraulic excavator 1 to the work site. After the excavator 1 moves to the work site, the operator can perform excavation work such as earth and sand by the work device 4 while turning the upper swing body 3 by operating the working lever 13.

  During operation of the hydraulic excavator 1, exhaust gas discharged from the engine 7 is introduced into the exhaust gas processing device 17 through the exhaust pipe 11. The exhaust gas introduced into the exhaust gas treatment device 17 is oxidized and removed by the oxidation catalyst 25 such as nitrogen monoxide (NO), carbon monoxide (CO), and hydrocarbon (HC) in the exhaust gas. The particulate matter (PM) in the exhaust gas is collected by the exhaust gas and then discharged to the outside of the excavator 1 through the tail tube 27.

  The particulate matter collected by the filter 26 is burned by forcibly raising the exhaust temperature of the exhaust gas, and can be removed from the filter 26. The exhaust gas in the high temperature state is discharged (released) to the outside of the vehicle body through the tail tube 27, but a part of the exhaust gas is a drain port 22D provided in the casing 19 of the exhaust gas processing device 17. Will flow into the upper cylindrical body 29 of the water drainage tool 28.

  When a large amount of this high-temperature exhaust gas flows into the drainage pipe 33 connected to the drainage device 28, the drainage pipe 33 is damaged due to thermal deterioration, or the vibration isolation provided around the drainage pipe 33. Various parts such as rubber 8 may be damaged due to thermal degradation.

  On the other hand, in the present embodiment, most of the exhaust gas that has flowed from the exhaust gas processing device 17 into the upper cylinder 29 of the drainage 28 is provided on the inner peripheral surface 29D of the upper cylinder 29. It is bounced back to 31 and discharged to the outside of the vehicle body through the tail tube 27.

  Further, the communication hole 32 provided in the partition member 31 and the opening 29 </ b> C provided in the bottom portion 29 </ b> B of the upper cylindrical body 29 do not penetrate in a straight line in the upward and downward directions. As a result, the exhaust gas that has flowed into the upper chamber S1 of the upper cylindrical body 29 enters the lower chamber S2 from the communication hole 32 provided on the inner peripheral surface 29D side of the cylindrical portion 29A, as indicated by an arrow F in FIG. After flowing in, it is led out to the lower cylindrical body 30 through an opening 29C formed in the center of the bottom 29B. Thus, since the flow of the exhaust gas greatly changes (bends) in the water draining tool 28, the exhaust gas is more unlikely to flow out from the upper chamber S1 of the upper cylindrical body 29 to the lower chamber S2. The flow rate of exhaust gas discharged from the outside can be reduced.

  Thus, according to the present embodiment, the lower cylindrical body is constituted by the partition member 31 provided on the inner peripheral surface 29D of the upper cylindrical body 29 constituting the water draining tool 28 and the communication hole 32 provided in the partition member 31. The flow rate of the exhaust gas flowing into 30 is reduced. Further, the communication holes 32 are provided at different positions in the upper and lower directions with respect to the opening 29 </ b> C provided in the bottom portion 29 </ b> B of the upper cylindrical body 29. That is, since the communication hole 32 and the opening 29C do not penetrate in a straight line in the upward and downward directions, the flow path of the exhaust gas that has flowed into the drainer 28 is formed between the upper cylindrical body 29 and the lower cylindrical body 30. It will be bent greatly between.

  Thereby, the flow rate of the exhaust gas in the high temperature state discharged from the water draining tool 28 can be reduced, so that the temperature of the exhaust gas in the high temperature state can be cooled (reduced) at an early stage. As a result, it is possible to suppress the heat deterioration of the drainage pipe 33 connected to the drainage device 28 and the peripheral parts of the drainage pipe 33, and to ensure that the moisture in the exhaust gas treatment device 17 is outside the vehicle body. It can be discharged.

  Further, since the inner diameter dimension A of the upper cylinder body 29 is formed larger than the inner diameter dimension B of the lower cylinder body 30, it is possible to improve the drainage of moisture accumulated in the exhaust gas treatment device 17, and Since the gas can be prevented from flowing out from the water draining tool 28, the stability and reliability of the excavator 1 can be improved.

  Further, in the exhaust gas processing device 17, processing equipment including an oxidation catalyst 25, a filter 26, and a silencer 27 A is provided, and provided on the exhaust gas outlet 22 C side which is the most downstream side of the exhaust gas processing device 17. The drainage tool 28 is connected to the drain port 22D. Thus, rainwater that has entered through the tail tube 27 and moisture condensed in the exhaust gas processing device 17 can be reliably guided to the outside of the vehicle body.

  In addition, since the flow rate of exhaust gas that has reached a high temperature to burn the particulate matter collected by the filter 26 can be reduced from the water draining tool 28, the exhaust gas treatment device 17 can be clogged. The drainability can be improved, and the stability and reliability of the hydraulic excavator 1 can be improved.

  In the above-described embodiment, the case where the drain pipe 33 is configured as a flexible pipe using flexible rubber, a resin material, or the like has been described as an example. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 10, the drainage pipe 41 connected to the drainer 28 is configured as a metal pipe such as a metal steel pipe, The lower end side of the pipe line 41 may be fixed to the bottom plate 5 </ b> A of the revolving frame 5 using the bolt 42, and the upper end side may be connected to the lower cylinder body 30.

  Further, in the above-described embodiment, the case where the inner diameter dimension A of the upper cylinder body 29 is formed larger than the inner diameter dimension B of the lower cylinder body 30 has been described as an example. However, the present invention is not limited to this. For example, as in the second modified example shown in FIG. 11, the drainage tool 51 is constituted by an upper cylinder 52 and a lower cylinder 53 having the same inner diameter, and the upper cylinder 52 It is good also as a structure which provides the bottom part 52B which has 52 A of opening in A, and provides the partition member 55 which has the communicating hole 54 in 52 C of inner peripheral surfaces of the upper cylinder 52, and divides upper chamber S3 and lower chamber S4. The same applies to the first modification.

  In the above-described embodiment, the case where the upper cylinder body 29 and the lower cylinder body 30 are formed separately and both are fixed by welding or the like has been described as an example. However, the present invention is not limited to this, and the upper cylinder and the lower cylinder may be integrally formed. The same applies to the first modification and the second modification.

  Moreover, in embodiment mentioned above, the case where the drainage pipe line 33 was connected to the lower end side of the lower cylinder 30 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and the lower end of the lower cylinder may be directly extended to the outside of the vehicle body. The same applies to the second modification.

  Further, in the present embodiment described above, the exhaust gas processing device 17 is provided with an example in which all of the processing equipment including the oxidation catalyst 25, the filter 26, and the silencer 27A of the tail pipe 27 are provided. Explained. However, the present invention is not limited to this, and in the exhaust gas treatment device, at least one treatment device or a combination of a plurality of treatment devices among these treatment devices is provided, and the water draining tool 28 is disposed on the most downstream side. It is good also as a structure provided between the processing apparatus located in and the outflow port of exhaust gas. The same applies to the first modification and the second modification.

  Moreover, in embodiment mentioned above, the hydraulic excavator 1 of canopy specification provided with the canopy 12A which covers the driver's seat 12 from upper direction was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, the present invention may be applied to a cab specification hydraulic excavator in which a driver's seat is arranged in the cab.

  Further, in the above-described embodiment, the hydraulic excavator 1 including the crawler type lower traveling body 2 is described as an example of the construction machine. However, the present invention is not limited to this, and can also be applied to other construction machines such as a hydraulic excavator provided with a wheel-type lower traveling body and a hydraulic crane.

1 Excavator (construction machine)
7 Engine 7A Exhaust port 11 Exhaust pipe 17 Exhaust gas treatment device 19 Casing 22C Outlet 25 Oxidation catalyst 26 Filter 27A Silencer 28, 51 Drainage tool 29, 52 Upper cylindrical body 29A Cylindrical part 29B, 52B Bottom part 29C, 52A Opening 29D, 52C Inner peripheral surface 30 Lower cylinder 31, 55 Partition member 32, 54 Communication hole 33, 41 Drain pipe S1, S3 Upper chamber S2, S4 Lower chamber A Inner diameter of upper cylinder B Inner diameter of lower cylinder

Claims (4)

Processed exhaust gas having a self-propelled vehicle body, an engine mounted on the vehicle body and having an exhaust port, an exhaust pipe connected to the exhaust port of the engine, and a casing provided connected to the exhaust pipe A construction comprising: an exhaust gas processing device having an outlet for discharging the water to the outside; and a water draining tool connected to the exhaust gas processing device and for discharging water accumulated in the exhaust gas processing device to the outside of the vehicle body In the machine
The drainage tool has a bottomed cylindrical shape whose upper end is connected to a lower position in the upper and lower direction with respect to the casing of the exhaust gas processing device on the outlet side of the exhaust gas processing device and has an opening at the bottom of the cylindrical portion. An upper cylindrical body, a lower cylindrical body provided on the lower side of the upper cylindrical body in communication with an opening at the bottom of the upper cylindrical body, and an upper circumferential body provided on an inner peripheral surface of the upper cylindrical body. A partition member that partitions the side chamber and the lower chamber, and a communication hole that is provided in the partition member at different positions in the upper and lower directions with respect to the opening of the bottom portion of the upper cylindrical body and communicates the upper chamber and the lower chamber. A construction machine characterized by comprising. The opening of the upper cylinder is formed at the center of the bottom of the upper cylinder,
The construction machine according to claim 1, wherein the communication hole is formed between an inner peripheral surface of a cylindrical portion of the upper cylindrical body and the partition member. An inner diameter dimension of the upper cylinder is formed larger than an inner diameter dimension of the lower cylinder,
The construction machine according to claim 1 or 2, wherein a drain pipe that guides the moisture to the outside of the vehicle body is connected to a lower end of the lower cylindrical body. In the exhaust gas treatment device, an oxidation catalyst for oxidizing the components in the exhaust gas discharged from the engine, a filter for collecting particulate matter contained in the exhaust gas, and the exhaust gas A configuration in which one or a plurality of processing devices among processing devices including a silencer that silences exhaust sound is provided,
The construction machine according to claim 1, 2, or 3, wherein the drainage tool is configured to be provided between the processing device located on the most downstream side and an outlet of the exhaust gas.

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