EP3022413A1 - Machine body and working machine - Google Patents

Machine body and working machine

Info

Publication number
EP3022413A1
EP3022413A1 EP14739779.8A EP14739779A EP3022413A1 EP 3022413 A1 EP3022413 A1 EP 3022413A1 EP 14739779 A EP14739779 A EP 14739779A EP 3022413 A1 EP3022413 A1 EP 3022413A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
reducing agent
side opening
air passage
injector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14739779.8A
Other languages
German (de)
French (fr)
Inventor
Toru Imano
Junya TOKUNAGA
Shinichi Nishiyama
Kazuhira WATANABE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar SARL
Original Assignee
Caterpillar SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar SARL filed Critical Caterpillar SARL
Publication of EP3022413A1 publication Critical patent/EP3022413A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/06—Arrangement in connection with cooling of propulsion units with air cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K13/00—Arrangement in connection with combustion air intake or gas exhaust of propulsion units
    • B60K13/04—Arrangement in connection with combustion air intake or gas exhaust of propulsion units concerning exhaust
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
    • E02F9/0866—Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2270/00—Mixing air with exhaust gases
    • F01N2270/02—Mixing air with exhaust gases for cooling exhaust gases or the apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2270/00—Mixing air with exhaust gases
    • F01N2270/08—Mixing air with exhaust gases for evacuation of exhaust gases, e.g. in tail-pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/02—Catalytic activity of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a machine body and a working machine both characterized by a cooling structure for an exhaust gas cleaning apparatus .
  • An exhaust gas cleaning apparatus for a diesel engine includes an injector that injects a reducing agent (DEF: Diesel Exhaust Fluid; a urea aqueous solution, in general) and a nitrogen oxide sensor (NOx sensor) .
  • DEF Diesel Exhaust Fluid
  • NOx sensor nitrogen oxide sensor
  • the exhaust gas cleaning apparatus is installed in an exhaust line. Hot exhaust gas flows through the exhaust line, and thus, the exhaust line and the exhaust gas cleaning apparatus become hot.
  • the injector and NOx sensor installed in the exhaust gas cleaning apparatus are also exposed to elevated temperatures.
  • a reducing agent supply pipe in general, a urea aqueous solution hose
  • the durability thereof may be impaired for structural reasons, and the temperature of the urea aqueous solution in the urea aqueous solution hose rises to affect the reducing effect of the urea aqueous solution.
  • the injector may be cooled when exposed to outside air during traveling or when a cool reducing agent flows into the injector, but cooling performance may still be insufficient.
  • a technique has been proposed which involves circular feeding of a refrigerant such as cooling water to the injector (see, for example, Patent Document 1) -
  • Patent Document 1 Japanese Patent Application
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2003-41627
  • Patent Document 1 needs a dedicated cooling water circuit through which a refrigerant such as cooling water flows around the periphery of the injector.
  • a cooling water circuit is a large-scale, expensive cooling apparatus.
  • Patent Document 2 uses the structure in which cooling air is introduced throughout the housing chamber for the exhaust gas cleaning apparatus, and thus needs a large-scale isolation chamber. This disadvantageously leads to the need for a large installation space.
  • An invention set forth in claim 1 is a machine body including a machine room, an engine installed in the machine room, an exhaust line through which exhaust gas from the engine is discharged, an exhaust gas cleaning apparatus provided in the exhaust line to execute a reducing process on nitrogen oxide in exhaust gas, and a reducing agent supply apparatus that supplies a liquid reducing agent to the exhaust gas cleaning apparatus through a reducing agent supply pipe
  • the exhaust gas cleaning apparatus includes an injector that injects the liquid reducing agent supplied by the reducing agent supply apparatus through the reducing agent supply pipe, a nitrogen oxide sensor that detects a concentration of the nitrogen oxide in the exhaust gas, an air passage body installed so as to surround at least one of a part of the reducing agent supply pipe, a part of the nitrogen oxide sensor, and a part of the injector to allow at least one of the liquid reducing agent in the reducing agent supply pipe, the nitrogen oxide sensor, and the injector to be cooled using cooling air taken from an outside of the machine room, the air passage body including an inlet side opening and an outlet side opening,
  • An invention set forth in claim 2 is a working machine including the machine body set forth in claim 1 and a working apparatus mounted on the machine body.
  • the invention set forth in claim 1 provides the structure in which the inlet side opening of the air passage body is in communication with the outside air intake port outside the machine room and in which the ejector provided in the exhaust line utilizes the negative pressure formed around the exhaust gas flow to suck the air in the air passage body into the exhaust gas flow in the exhaust gas line through the outlet side opening of the air passage body, allowing the air to be forcibly discharged.
  • the outside air is constantly introduced into the air passage body to enable efficient cooling of at least one of the liquid reducing agent in the reducing agent supply pipe, the nitrogen oxide sensor, and the injector.
  • a cooling effect can be exerted using a low-cost duct structure without the need for a special cooling water line or pump.
  • the air passage body may be installed which locally surrounds the cooling target area, allowing space to be conserved.
  • the invention set forth in claim 2 can provide inexpensive cooling means for a working machine that performs operations at a fixed location, the cooling means allowing efficient cooling of at least one of the liquid reducing agent in the reducing agent supply pipe, the nitrogen oxide sensor, and the injector.
  • FIG. 1 is a schematic plan view showing an embodiment of a machine room in a machine body according to the present invention .
  • FIG. 2 is a perspective view showing an exhaust gas cleaning apparatus in the machine body and a peripheral portion of the exhaust gas cleaning apparatus .
  • FIG. 3 is a perspective view showing only the peripheral portion of the exhaust gas cleaning apparatus in the machine body.
  • FIG. 4 is a front view showing a working machine including the machine body.
  • a working machine 10 like a hydraulic excavator has a machine body 11 including a lower traveling body 12 and an upper slewing body 13 mounted on the lower traveling body 12 so as to be able to slew.
  • a working apparatus 14 like a bucket is mounted on the upper slewing body 13 of the machine body 11.
  • a cab 15 in which an operator's seat is provided and a storage box 16 with tools and the like housed therein are provided across an area where the working apparatus 14 is mounted.
  • a fuel tank 17 and a hydraulic oil tank 18 are provided behind the storage box 16.
  • a machine room (engine room) 19 is installed on the upper slewing body 13 behind a slewing bearing portion.
  • a counterweight 20 is further installed behind the machine room 19.
  • an engine 21 is installed in the machine room 19.
  • a cooling fan 21f is located on one side of the engine 21 to blow cooling air sucked from the outside against a cooling package including a radiator, an oil cooler and the like (not shown in the drawings) to cool the cooling package.
  • An exhaust gas cleaning apparatus 22 is located on the other side of the engine 21 to execute an exhaust gas cleaning process on an exhaust system for the engine 21.
  • an engine hood 23 is provided at the top of the machine room 19 so as to be openable and closable.
  • a tip of an exhaust line 24 through which exhaust gas from the engine 21 is discharged projects from the engine hood 23.
  • a side door 25 is provided on an outer side surface side of the machine room 19 so as to be openable and closable.
  • a ventilation port 26 serving as an outside air intake port is formed in an upper portion of the side door 25 and is open to the outside of the machine room 19.
  • an exhaust opening of the engine 21 is connected, via connection means 21e serving as a start point for the exhaust line 24, to an end portion 27a of a black exhaust removal apparatus (diesel particulate filter) 27 that removes black exhaust contained in exhaust gas discharged from the engine 21.
  • a pipe connection portion 27b provided at an opposite end portion of the end portion 27a of the black exhaust removal apparatus 27 is connected, via a pipe 28a, to an opposite end portion 28b of a nitrogen oxide reduction apparatus (selective catalytic reduction) 28 that executes a reduction process on nitrogen oxide in exhaust gas.
  • the remaining portion of the exhaust line 24 is connected to a pipe connection portion 28c provided at an end portion of the nitrogen oxide reduction apparatus 28 which is opposite to the opposite end portion 28b.
  • An injector 29 is attached to the pipe connection portion 27b of the black exhaust removal apparatus 27 to inject a liquid reducing agent such as a urea aqueous solution toward the pipe 28a, via which the black exhaust removal apparatus 27 and the nitrogen oxide reduction apparatus 28 are in communication with each other.
  • An NOx sensor 30 is located near the injector 29 and serves as a nitrogen oxide sensor that detects the concentration of nitrogen oxide (NOx) in exhaust gas.
  • the NOx sensor 30 includes an upstream side NOx sensor main body 30a provided in the pipe connection portion 27b of the black exhaust removal apparatus 27, a downstream side NOx sensor main body 30b provided in the pipe connection portion 28c of the nitrogen oxide reduction apparatus 28, a control box 30A connected to the upstream side NOx sensor main body 30a, and a control box 30B connected to the downstream side NOx sensor main body 30b.
  • a reducing agent supply apparatus 31 which feeds a liquid reducing agent such as a urea aqueous solution from the inside of the storage box 16 located at a position not thermally affected by the engine 21 as shown in FIG. 4 to the nitrogen oxide reduction apparatus 28, is provided with respect to the injector 29 .
  • the reducing agent supply apparatus As shown in FIG. 4, the reducing agent supply apparatus
  • liquid reducing agent tank 32 installed in the storage box 16 and in which the liquid reducing agent is stored and a liquid reducing agent pump 33 serving as a liquid reducing agent supply source that pumps up and ejects the liquid reducing agent in the liquid reducing agent tank 32, and a urea aqueous solution hose 34 serving as a reducing agent supply pipe and disposed to extend from the liquid reducing agent pump 33 through a piping path in the machine body 11 to the injector 29 for injection of the liquid reducing agent.
  • An air passage body 35 is provided so as to surround a part of a tip of the urea aqueous solution hose 34.
  • the following are housed inside the air passage body 35: a part of the injector 29, a part of the NOx sensor 30, and a part of the urea aqueous solution hose 34 in which the urea aqueous solution in the urea aqueous solution hose 34 serving as a liquid reducing agent is likely to be thermally affected by the exhaust gas cleaning apparatus 22.
  • the air passage body 35 is shaped like a box fixedly installed on a plate 41.
  • An inlet side opening 42 is formed in a lower side surface of the air passage body 35 and connects to a suction duct 43 and is in communication with the suction duct 43.
  • the suction duct 43 is in communication with an opening 47 formed between the plate 41 and a plate 44 and having a U-shaped cross section, via a corner passage 46 formed between the upper plate 44 and a lower plate 45 and having a U-shaped cross section.
  • the opening 47 is formed to face the ventilation port 26 in the side door 25.
  • the ventilation port 26 serves as an inlet when cooling air is taken from the outside of the machine room 19 into the air passage body 35.
  • the corner passage 46 has an open surface on the outside of the corner passage 46 which is closed by a machine cover or a member associated with the machine cover, to form a duct.
  • the suction duct 43 and the corner passage 46 form duct-like air passages 43 and 46.
  • the exhaust gas cleaning apparatus 22 is fixedly installed on the plate 44 using a mounting plate 48.
  • the exhaust line 24 is temporarily drawn out, in the horizontal direction, from the pipe connection portion 28c of the nitrogen oxide reduction apparatus 28 and then routed obliquely upward.
  • the ejector 51 is provided in the middle of the exhaust line 24.
  • An intake port 52 formed in an outer side surface of the ejector 51 is in communication, via a suction pipe 54, with an outlet side opening 53 formed in an upper end surface portion of the air passage body 35.
  • the ejector 51 utilizes a negative pressure formed around the periphery of an exhaust gas flow to forcibly suck the air in the air passage body 35 through the outlet side opening 53 of the air passage body 35.
  • a wall body 55 is provided on the plate 44 and arranged in an L shape so as to enclose the outside of the exhaust gas cleaning apparatus 22.
  • the urea aqueous solution hose 34 is disposed along the wall body 55 using a hook
  • the urea aqueous solution hose 34 is drawn into the corner passage 46 through a pipe introduction inlet portion 58 cut out in a part of the plate 44, and is then inserted through the suction duct 43 into the air passage body 35 and further connected to the injector 29.
  • Wiring in the air passage body 35 connected to the control boxes 30 ⁇ and 30B of the NOx sensor 30 is connected, via the suction duct 43 and the like, to a controller (not shown in the drawings) installed in the machine body 11 to control the liquid reducing agent pump 33.
  • FIG. 4 will be described.
  • the reducing agent supply apparatus 31 pumps up the urea aqueous solution in the liquid reducing agent tank 32 in the storage box 16 using the liquid reducing agent pump 33 and feeds the urea aqueous solution to the exhaust gas cleaning apparatus 22 in the machine room 19 through the urea aqueous solution hose 34.
  • the injector 29 then injects the urea aqueous solution into the pipe 28a connected to an upstream side of the nitrogen oxide reduction apparatus 28.
  • the wall body 55, the corner passage 46, the suction duct 43, and the air passage body 35 function as a heat shielding structure that blocks heat radiated by the exhaust gas cleaning apparatus 22 to protect the urea aqueous solution hose 34 from the heat.
  • the ejector 51 provided in the exhaust line 24 utilizes a negative pressure formed around the periphery of the exhaust gas flow to suck the air in the air passage body 35 into the exhaust gas flow in the exhaust line 24 through the outlet side opening 53 of the air passage body 35, allowing the air to be forcibly discharged to the outside.
  • cool outside air outside the machine body 11 can be sucked into the air passage body 35 through the ventilation port 26, serving as an outside air intake port of the side door 25, via the opening 47, the corner passage 46, and the suction duct 43.
  • the air passage body 35 is internally cooled by the cool outside air, enabling cooling of the urea aqueous solution in the urea aqueous solution hose 34 fitted in the air passage body 35, the NOx sensor 30, and the injector 29.
  • the ejector 51 provided in the exhaust line 24 utilizes the negative pressure formed around the periphery of the exhaust gas flow to suck the air in the air passage body 35 into the exhaust gas flow in the exhaust line 24 through the outlet side opening 53 of the air passage body 35, allowing the air to be forcibly discharged to the outside .
  • the outside air is constantly introduced into the air passage body 35 to enable efficient cooling of the urea aqueous solution in the urea aqueous solution hose 34, the NOx sensor 30, and the injector 29, which are exposed to the elevated temperature of the exhaust gas cleaning apparatus 22.
  • the air passage body 35 may be installed which locally surrounds a part of the urea aqueous solution hose 34, a part of the NOx sensor 30, and a part of the injector 29, that is, the cooling target area, allowing space to be conserved.
  • inexpensive cooling means for the working machine 10 that performs operations at a fixed location can be provided which means allows efficient cooling of the urea aqueous solution in the urea aqueous solution hose 34, the NOx sensor 30, and the injector 29 , which are exposed to the elevated temperature of the exhaust gas cleaning apparatus 22.
  • the air passage body 35 is not limited to the box-like shape shown in FIG. 2 and FIG. 3.
  • a part of the air passage body 35 from the inlet side opening 42 to the outlet side opening 53 may be shaped like a duct so that the part of the urea aqueous solution hose 34 which is exposed to elevated temperatures, the NOx sensor 30, and a part of the injector 29 can be arranged in the duct. This structure exerts similar effects.
  • the air passage body 35 allows cooling of the urea aqueous solution in the urea aqueous solution hose 34, the NOx sensor 30, and the injector 29.
  • the air passage body 35 may be installed so as to surround one or two of the following: a part of the urea aqueous solution hose 34, a part of the NOx sensor 30, and a part of the injector 29 to allow the one or two to be cooled using cooling air externally obtained.
  • the present invention is available for manufactures involved in manufacture of a machine body and a working machine characterized by a cooling structure of an exhaust gas cleaning apparatus .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Transportation (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

Provided is a space-saving inexpensive machine which is capable of cooling a part necessary to be cooled of an exhaust gas treatment device. The exhaust gas treatment device (22) includes an injector (29) which injects urea water as a liquid reducing agent supplied through a urea water hose (34) serving as a reducing agent supply pipe from a reducing agent supply source, a NOx sensor (30) which detects a concentration of nitrogen oxide in exhaust gas, and an air duct (35) including an inlet side opening (42) and an outlet side opening (53) that cool at lease either one of the urea water in the urea water hose (34), the NOx sensor (30) or the injector (29) with cooling air introduced from outside of the machine room (19). A ventilation opening (26) opened at the outside of the machine room (19) is communicated with the inlet side opening (42) of the air duct (35), and air in the air duct (35) is forcibly exhausted from the outlet side opening(53) of the air duct (35) with the use of negative pressure formed in a circumference of the exhaust gas flow by an ejector (51) arranged in an exhaust pipe passage (24).

Description

DESCRIPTION
MACHINE BODY AND WORKING MACHINE
TECHNICAL FIELD
[0001] The present invention relates to a machine body and a working machine both characterized by a cooling structure for an exhaust gas cleaning apparatus .
BACKGROUND ART
[0002] An exhaust gas cleaning apparatus for a diesel engine includes an injector that injects a reducing agent (DEF: Diesel Exhaust Fluid; a urea aqueous solution, in general) and a nitrogen oxide sensor (NOx sensor) .
[0003] In general, the exhaust gas cleaning apparatus is installed in an exhaust line. Hot exhaust gas flows through the exhaust line, and thus, the exhaust line and the exhaust gas cleaning apparatus become hot.
[0004] When the exhaust gas cleaning apparatus is hot, the injector and NOx sensor installed in the exhaust gas cleaning apparatus are also exposed to elevated temperatures. Moreover, a reducing agent supply pipe (in general, a urea aqueous solution hose) through which the reducing agent is supplied to the injector is partly exposed to elevated temperatures. When the urea aqueous hose, the NOx sensor, or the injector is exposed to elevated temperatures for a long time, the durability thereof may be impaired for structural reasons, and the temperature of the urea aqueous solution in the urea aqueous solution hose rises to affect the reducing effect of the urea aqueous solution.
[0005] In a traveling vehicle such as a car, the injector may be cooled when exposed to outside air during traveling or when a cool reducing agent flows into the injector, but cooling performance may still be insufficient. For such a case, a technique has been proposed which involves circular feeding of a refrigerant such as cooling water to the injector (see, for example, Patent Document 1) -
[0006] Another technique has been proposed which involves introduction of cooling air throughout a housing chamber for the exhaust gas cleaning apparatus based on an ejector effect for engine exhaust gas (see, for example, Patent Document 2) .
[0007] Patent Document 1: Japanese Patent Application
Laid-Open No. H9-96212
Patent Document 2: Japanese Patent Application Laid-Open No. 2003-41627
[0008] Patent Document 1 needs a dedicated cooling water circuit through which a refrigerant such as cooling water flows around the periphery of the injector. Such a cooling water circuit is a large-scale, expensive cooling apparatus.
[0009] Patent Document 2 uses the structure in which cooling air is introduced throughout the housing chamber for the exhaust gas cleaning apparatus, and thus needs a large-scale isolation chamber. This disadvantageously leads to the need for a large installation space.
[0010] With these problems in view, it is an object of the present invention to provide a machine body and a working machine which need only low costs and a small space and which allow a desired portion of an exhaust gas cleaning apparatus to be solely cooled.
DISCLOSURE OF THE INVENTION
[0011] An invention set forth in claim 1 is a machine body including a machine room, an engine installed in the machine room, an exhaust line through which exhaust gas from the engine is discharged, an exhaust gas cleaning apparatus provided in the exhaust line to execute a reducing process on nitrogen oxide in exhaust gas, and a reducing agent supply apparatus that supplies a liquid reducing agent to the exhaust gas cleaning apparatus through a reducing agent supply pipe, wherein the exhaust gas cleaning apparatus includes an injector that injects the liquid reducing agent supplied by the reducing agent supply apparatus through the reducing agent supply pipe, a nitrogen oxide sensor that detects a concentration of the nitrogen oxide in the exhaust gas, an air passage body installed so as to surround at least one of a part of the reducing agent supply pipe, a part of the nitrogen oxide sensor, and a part of the injector to allow at least one of the liquid reducing agent in the reducing agent supply pipe, the nitrogen oxide sensor, and the injector to be cooled using cooling air taken from an outside of the machine room, the air passage body including an inlet side opening and an outlet side opening, an outside air intake port which communicates with the inlet side opening of the air passage body and which opens to the outside of the machine room, and an ejector provided in the exhaust line to forcibly discharge air in the air passage body through the outlet side opening of the air passage body by utilizing a negative pressure formed around an exhaust gas flow.
[0012] An invention set forth in claim 2 is a working machine including the machine body set forth in claim 1 and a working apparatus mounted on the machine body.
[0013] The invention set forth in claim 1 provides the structure in which the inlet side opening of the air passage body is in communication with the outside air intake port outside the machine room and in which the ejector provided in the exhaust line utilizes the negative pressure formed around the exhaust gas flow to suck the air in the air passage body into the exhaust gas flow in the exhaust gas line through the outlet side opening of the air passage body, allowing the air to be forcibly discharged. Thus, while the engine is being driven to discharge the exhaust gas, the outside air is constantly introduced into the air passage body to enable efficient cooling of at least one of the liquid reducing agent in the reducing agent supply pipe, the nitrogen oxide sensor, and the injector. Thus, a cooling effect can be exerted using a low-cost duct structure without the need for a special cooling water line or pump. Furthermore, the air passage body may be installed which locally surrounds the cooling target area, allowing space to be conserved.
[0014] The invention set forth in claim 2 can provide inexpensive cooling means for a working machine that performs operations at a fixed location, the cooling means allowing efficient cooling of at least one of the liquid reducing agent in the reducing agent supply pipe, the nitrogen oxide sensor, and the injector.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a schematic plan view showing an embodiment of a machine room in a machine body according to the present invention .
FIG. 2 is a perspective view showing an exhaust gas cleaning apparatus in the machine body and a peripheral portion of the exhaust gas cleaning apparatus .
FIG. 3 is a perspective view showing only the peripheral portion of the exhaust gas cleaning apparatus in the machine body.
FIG. 4 is a front view showing a working machine including the machine body.
BEST MODE FOR CARRYING OUT THE INVENTION
[0016] The present invention will be described below based on an embodiment shown in FIGS. 1 to 4.
[0017] As shown in FIG. 4, a working machine 10 like a hydraulic excavator has a machine body 11 including a lower traveling body 12 and an upper slewing body 13 mounted on the lower traveling body 12 so as to be able to slew. A working apparatus 14 like a bucket is mounted on the upper slewing body 13 of the machine body 11.
[0018] On the upper slewing body 13, a cab 15 in which an operator's seat is provided and a storage box 16 with tools and the like housed therein are provided across an area where the working apparatus 14 is mounted. A fuel tank 17 and a hydraulic oil tank 18 are provided behind the storage box 16. A machine room (engine room) 19 is installed on the upper slewing body 13 behind a slewing bearing portion. A counterweight 20 is further installed behind the machine room 19.
[0019] As shown in FIG. 1, an engine 21 is installed in the machine room 19. A cooling fan 21f is located on one side of the engine 21 to blow cooling air sucked from the outside against a cooling package including a radiator, an oil cooler and the like (not shown in the drawings) to cool the cooling package. An exhaust gas cleaning apparatus 22 is located on the other side of the engine 21 to execute an exhaust gas cleaning process on an exhaust system for the engine 21.
[0020] As seen back in FIG. 4, an engine hood 23 is provided at the top of the machine room 19 so as to be openable and closable. A tip of an exhaust line 24 through which exhaust gas from the engine 21 is discharged projects from the engine hood 23. Furthermore, a side door 25 is provided on an outer side surface side of the machine room 19 so as to be openable and closable. A ventilation port 26 serving as an outside air intake port is formed in an upper portion of the side door 25 and is open to the outside of the machine room 19.
[0021] As shown in FIG. 1 and FIG.2, in the exhaust gas cleaning apparatus 22, an exhaust opening of the engine 21 is connected, via connection means 21e serving as a start point for the exhaust line 24, to an end portion 27a of a black exhaust removal apparatus (diesel particulate filter) 27 that removes black exhaust contained in exhaust gas discharged from the engine 21. A pipe connection portion 27b provided at an opposite end portion of the end portion 27a of the black exhaust removal apparatus 27 is connected, via a pipe 28a, to an opposite end portion 28b of a nitrogen oxide reduction apparatus (selective catalytic reduction) 28 that executes a reduction process on nitrogen oxide in exhaust gas. The remaining portion of the exhaust line 24 is connected to a pipe connection portion 28c provided at an end portion of the nitrogen oxide reduction apparatus 28 which is opposite to the opposite end portion 28b.
[0022] An injector 29 is attached to the pipe connection portion 27b of the black exhaust removal apparatus 27 to inject a liquid reducing agent such as a urea aqueous solution toward the pipe 28a, via which the black exhaust removal apparatus 27 and the nitrogen oxide reduction apparatus 28 are in communication with each other. An NOx sensor 30 is located near the injector 29 and serves as a nitrogen oxide sensor that detects the concentration of nitrogen oxide (NOx) in exhaust gas.
[0023] The NOx sensor 30 includes an upstream side NOx sensor main body 30a provided in the pipe connection portion 27b of the black exhaust removal apparatus 27, a downstream side NOx sensor main body 30b provided in the pipe connection portion 28c of the nitrogen oxide reduction apparatus 28, a control box 30A connected to the upstream side NOx sensor main body 30a, and a control box 30B connected to the downstream side NOx sensor main body 30b.
[0024] A reducing agent supply apparatus 31, which feeds a liquid reducing agent such as a urea aqueous solution from the inside of the storage box 16 located at a position not thermally affected by the engine 21 as shown in FIG. 4 to the nitrogen oxide reduction apparatus 28, is provided with respect to the injector 29 .
[0025] As shown in FIG. 4, the reducing agent supply apparatus
31 includes a liquid reducing agent tank 32 installed in the storage box 16 and in which the liquid reducing agent is stored and a liquid reducing agent pump 33 serving as a liquid reducing agent supply source that pumps up and ejects the liquid reducing agent in the liquid reducing agent tank 32, and a urea aqueous solution hose 34 serving as a reducing agent supply pipe and disposed to extend from the liquid reducing agent pump 33 through a piping path in the machine body 11 to the injector 29 for injection of the liquid reducing agent. An air passage body 35 is provided so as to surround a part of a tip of the urea aqueous solution hose 34.
[0026] As shown in FIG. 1, the following are housed inside the air passage body 35: a part of the injector 29, a part of the NOx sensor 30, and a part of the urea aqueous solution hose 34 in which the urea aqueous solution in the urea aqueous solution hose 34 serving as a liquid reducing agent is likely to be thermally affected by the exhaust gas cleaning apparatus 22.
[0027] As shown in FIG. 2 and FIG. 3, the air passage body 35 is shaped like a box fixedly installed on a plate 41. An inlet side opening 42 is formed in a lower side surface of the air passage body 35 and connects to a suction duct 43 and is in communication with the suction duct 43. The suction duct 43 is in communication with an opening 47 formed between the plate 41 and a plate 44 and having a U-shaped cross section, via a corner passage 46 formed between the upper plate 44 and a lower plate 45 and having a U-shaped cross section. The opening 47 is formed to face the ventilation port 26 in the side door 25. The ventilation port 26 serves as an inlet when cooling air is taken from the outside of the machine room 19 into the air passage body 35.
[0028] The corner passage 46 has an open surface on the outside of the corner passage 46 which is closed by a machine cover or a member associated with the machine cover, to form a duct. The suction duct 43 and the corner passage 46 form duct-like air passages 43 and 46. The exhaust gas cleaning apparatus 22 is fixedly installed on the plate 44 using a mounting plate 48.
[0029] As shown in FIG. 2, the exhaust line 24 is temporarily drawn out, in the horizontal direction, from the pipe connection portion 28c of the nitrogen oxide reduction apparatus 28 and then routed obliquely upward. The ejector 51 is provided in the middle of the exhaust line 24. An intake port 52 formed in an outer side surface of the ejector 51 is in communication, via a suction pipe 54, with an outlet side opening 53 formed in an upper end surface portion of the air passage body 35. The ejector 51 utilizes a negative pressure formed around the periphery of an exhaust gas flow to forcibly suck the air in the air passage body 35 through the outlet side opening 53 of the air passage body 35.
[0030] As shown in FIG. 2 and FIG. 3, a wall body 55 is provided on the plate 44 and arranged in an L shape so as to enclose the outside of the exhaust gas cleaning apparatus 22. The urea aqueous solution hose 34 is disposed along the wall body 55 using a hook
56 provided on an outer side surface of the wall body 55 and a fitting
57 installed on the plate 44. Moreover, the urea aqueous solution hose 34 is drawn into the corner passage 46 through a pipe introduction inlet portion 58 cut out in a part of the plate 44, and is then inserted through the suction duct 43 into the air passage body 35 and further connected to the injector 29.
[0031] Wiring in the air passage body 35 connected to the control boxes 30Ά and 30B of the NOx sensor 30 is connected, via the suction duct 43 and the like, to a controller (not shown in the drawings) installed in the machine body 11 to control the liquid reducing agent pump 33.
[0032] Now, the effects of the embodiment shown in FIG. 1 to
FIG. 4 will be described.
[0033] The reducing agent supply apparatus 31 pumps up the urea aqueous solution in the liquid reducing agent tank 32 in the storage box 16 using the liquid reducing agent pump 33 and feeds the urea aqueous solution to the exhaust gas cleaning apparatus 22 in the machine room 19 through the urea aqueous solution hose 34. The injector 29 then injects the urea aqueous solution into the pipe 28a connected to an upstream side of the nitrogen oxide reduction apparatus 28.
[0034] At this time, the wall body 55, the corner passage 46, the suction duct 43, and the air passage body 35 function as a heat shielding structure that blocks heat radiated by the exhaust gas cleaning apparatus 22 to protect the urea aqueous solution hose 34 from the heat. Furthermore, the ejector 51 provided in the exhaust line 24 utilizes a negative pressure formed around the periphery of the exhaust gas flow to suck the air in the air passage body 35 into the exhaust gas flow in the exhaust line 24 through the outlet side opening 53 of the air passage body 35, allowing the air to be forcibly discharged to the outside. Thus, cool outside air outside the machine body 11 can be sucked into the air passage body 35 through the ventilation port 26, serving as an outside air intake port of the side door 25, via the opening 47, the corner passage 46, and the suction duct 43.
[0035] Thus, while the engine 21 is in operation, the air passage body 35 is internally cooled by the cool outside air, enabling cooling of the urea aqueous solution in the urea aqueous solution hose 34 fitted in the air passage body 35, the NOx sensor 30, and the injector 29.
[0036] Thus, the inlet side opening 42 of the air passage body
35 is in communication with the ventilation port 26 outside the machine room, and the ejector 51 provided in the exhaust line 24 utilizes the negative pressure formed around the periphery of the exhaust gas flow to suck the air in the air passage body 35 into the exhaust gas flow in the exhaust line 24 through the outlet side opening 53 of the air passage body 35, allowing the air to be forcibly discharged to the outside . Thus, while the engine 21 is being driven to discharge the exhaust gas, the outside air is constantly introduced into the air passage body 35 to enable efficient cooling of the urea aqueous solution in the urea aqueous solution hose 34, the NOx sensor 30, and the injector 29, which are exposed to the elevated temperature of the exhaust gas cleaning apparatus 22. Consequently, a cooling effect can be exerted using a low-cost duct structure without the need for a special cooling water line or pump. Furthermore, the air passage body 35 may be installed which locally surrounds a part of the urea aqueous solution hose 34, a part of the NOx sensor 30, and a part of the injector 29, that is, the cooling target area, allowing space to be conserved.
[0037] Furthermore, inexpensive cooling means for the working machine 10 that performs operations at a fixed location can be provided which means allows efficient cooling of the urea aqueous solution in the urea aqueous solution hose 34, the NOx sensor 30, and the injector 29 , which are exposed to the elevated temperature of the exhaust gas cleaning apparatus 22.
[0038] The air passage body 35 is not limited to the box-like shape shown in FIG. 2 and FIG. 3. A part of the air passage body 35 from the inlet side opening 42 to the outlet side opening 53 may be shaped like a duct so that the part of the urea aqueous solution hose 34 which is exposed to elevated temperatures, the NOx sensor 30, and a part of the injector 29 can be arranged in the duct. This structure exerts similar effects.
[0039] Furthermore, the air passage body 35 allows cooling of the urea aqueous solution in the urea aqueous solution hose 34, the NOx sensor 30, and the injector 29. However, the air passage body 35 may be installed so as to surround one or two of the following: a part of the urea aqueous solution hose 34, a part of the NOx sensor 30, and a part of the injector 29 to allow the one or two to be cooled using cooling air externally obtained.
INDUSTRIAL APPLICABILITY
[0040] The present invention is available for manufactures involved in manufacture of a machine body and a working machine characterized by a cooling structure of an exhaust gas cleaning apparatus .
EXPLANATION OF REFERENCE NUMERALS
[0041] 10 Working machine
11 Machine body
14 Working apparatus
19 Machine room
21 Engine
22 Exhaust gas cleaning apparatus
24 Exhaust line
26 Ventilation port as outside air intake port
29 Injector
30 NOx sensor as nitrogen oxide sensor
31 Reducing agent supply apparatus
34 Urea aqueous solution hose as reducing agent supply pipe
35 Air passage body Inlet side opening Ejector
Outlet side opening

Claims

1. A machine body comprising:
a machine room;
an engine installed in the machine room;
an exhaust line through which exhaust gas from the engine is discharged;
an exhaust gas cleaning apparatus provided in the exhaust line to execute a reducing process on nitrogen oxide in exhaust gas; and
a reducing agent supply apparatus that supplies a liquid reducing agent to the exhaust gas cleaning apparatus through a reducing agent supply pipe,
wherein the exhaust gas cleaning apparatus includes:
an injector that injects the liquid reducing agent supplied by the reducing agent supply apparatus through the reducing agent supply pipe;
a nitrogen oxide sensor that detects a concentration of the nitrogen oxide in the exhaust gas;
an air passage body installed so as to surround at least one of a part of the reducing agent supply pipe, a part of the nitrogen oxide sensor, and a part of the injector to allow at least one of the liquid reducing agent in the reducing agent supply pipe, the nitrogen oxide sensor, and the injector to be cooled using cooling air taken from an outside of the machine room, the air passage body including an inlet side opening and an outlet side opening; an outside air intake port which communicates with the inlet side opening of the air passage body and which opens to the outside of the machine room; and
an ejector provided in the exhaust line to forcibly discharge air in the air passage body through the outlet side opening of the air passage body by utilizing a negative pressure formed around an exhaust gas flow.
2. A working machine comprising: the machine body according to claim 1; and a working apparatus mounted on the machine body.
EP14739779.8A 2013-07-16 2014-07-10 Machine body and working machine Withdrawn EP3022413A1 (en)

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JP2013147917A JP2015021398A (en) 2013-07-16 2013-07-16 Machine body and work machine
PCT/EP2014/064850 WO2015007614A1 (en) 2013-07-16 2014-07-10 Machine body and working machine

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CN105593483A (en) 2016-05-18
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KR20160030227A (en) 2016-03-16
WO2015007614A1 (en) 2015-01-22
CA2917973A1 (en) 2015-01-22

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