JP2013181400A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working machine that can suppress the overheat of a reducing agent during the feeding of liquid.SOLUTION: A hydraulic shovel 100 includes: a reducing agent supply device 43 for supplying a reducing agent; a reducing agent administration device 56 for administering the reducing agent into an exhaust passage; a liquid feed pipe 200 communicated between the reducing agent supply device 43 and the reducing agent administration device 56; an air feed pipe 300 having an intake port and an exhaust port, which covers at least one part of the liquid feed pipe 200; and a selective catalytic reduction device 54 connected to the exhaust passage.

Description

  The present invention relates to a work machine including a selective catalytic reduction device.

  In recent years, selective catalytic reduction devices for purifying exhaust gas have been widely used in work machines. In this work machine, a reducing agent tank that stores a reducing agent (for example, urea water), a reducing agent administration device that administers the reducing agent in the exhaust path, and a reducing agent is sent from the reducing agent tank to the reducing agent administration device. And a liquid feeding pipe for the purpose.

  Here, a method of distributing a plurality of reducing agent tanks in a distributed manner has been proposed (see Patent Document 1). According to this technique, since the reducing agent stored in at least one reducing agent tank can be prevented from being overcooled or overheated, the reducing agent can be stably administered.

JP 2006-46016 A

  However, in the method of Patent Document 1, when the liquid feeding pipe is routed near a high-temperature part (for example, a main valve or an engine), the reducing agent overheats while moving in the liquid feeding pipe. There is a risk of deterioration.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a work machine that can suppress the overheating of the reducing agent during liquid feeding.

  A work machine according to a first aspect of the present invention includes a reducing agent supply device that supplies a reducing agent, a reducing agent administration device that administers the reducing agent into an exhaust path, a reducing agent supply device, and a reducing agent administration device. Communicating, having a liquid supply pipe for sending the reducing agent from the reducing agent supply device to the reducing agent administration device, an air intake port and an exhaust port, and an air supply tube covering at least a part of the liquid supply tube; And a selective catalytic reduction device to be connected.

  According to the work machine according to the first aspect of the present invention, the reducing agent flowing in the liquid supply pipe can be cooled by the air flowing in the air supply pipe from the intake port toward the exhaust port. Therefore, it can suppress that a reducing agent overheats during liquid feeding.

The work machine according to the second aspect of the present invention includes a fan. The exhaust port is disposed on the upstream side of the fan.
According to the work machine which concerns on the 2nd aspect of this invention, air can be efficiently flowed in an air pipe by utilizing the negative pressure which generate | occur | produces in the upstream of a fan.

  A work machine according to a third aspect of the present invention includes a selective catalyst reduction device connected to an exhaust path and an exhaust pipe connected to the selective catalyst reduction device. The exhaust port is disposed in the exhaust pipe.

  According to the work machine according to the third aspect of the present invention, since the exhaust port is disposed in the exhaust pipe, the air is efficiently sucked out from the exhaust port by using the venturi effect associated with the flow of the exhaust gas. Can do. Therefore, since air can be efficiently flowed into the air feeding pipe, it is possible to further suppress the overheating of the reducing agent during liquid feeding.

A work machine according to a fourth aspect of the present invention includes a work machine and a main valve that supplies hydraulic oil to the work machine. The liquid supply pipe passes through a position adjacent to the main valve, and the air supply pipe covers a portion of the liquid supply pipe adjacent to the main valve.
According to the working machine which concerns on the 4th aspect of this invention, it can suppress that a liquid feeding pipe is heated with the heat | fever of a main valve.

A work machine according to a fifth aspect of the present invention includes an engine and an engine room that stores the engine. The liquid supply pipe passes through a position adjacent to the engine, and the air supply pipe covers a portion of the liquid supply pipe adjacent to the engine.
According to the working machine which concerns on the 5th aspect of this invention, it can suppress that a liquid feeding pipe is heated with the heat of an engine.

In the work machine according to the sixth aspect of the present invention, the reducing agent supply device is disposed in front of the engine, and the liquid feeding pipe passes through the front of the engine.
According to the work machine according to the sixth aspect of the present invention, it is possible to reduce the area for disposing the liquid feeding pipe as compared with the case of passing the rear of the engine in order to avoid heating by the heat of the engine.

In the work machine according to the seventh aspect of the present invention, the liquid feeding pipe is piped along the front wall of the engine room.
According to the work machine concerning the 7th mode of the present invention, compared with the case where it passes along the back of an engine in order to avoid the heating by the heat of an engine, the arrangement area of a liquid feeding pipe can be made small.

In the work machine according to the eighth aspect of the present invention, the air supply pipe has a heat insulating material disposed inside.
With the work machine according to the eighth aspect of the present invention, the heat shielding effect of the air supply pipe can be further improved, so that the overheating of the reducing agent can be further suppressed.

  A work machine according to a ninth aspect of the present invention includes a reducing agent tank that stores a reducing agent that is supplied to a reducing agent supply device, and a fuel tank that stores fuel supplied to an engine. The reducing agent tank is in contact with the fuel tank.

  With the work machine according to the ninth aspect of the present invention, the reducing agent stored in the reducing agent tank can be cooled by heat transfer from the reducing agent tank to the fuel tank. Accordingly, it is possible to suppress the reducing agent from reaching the alteration temperature during liquid feeding.

A work machine according to a tenth aspect of the present invention includes a fan and a reducing agent tank that stores the reducing agent supplied to the reducing agent supply device. The reducing agent tank is disposed on the upstream side of the fan.
According to the work machine which concerns on the 10th aspect of this invention, the reducing agent stored in the reducing agent tank can be cooled with the cooling air of a fan.

  In the work machine according to the eleventh aspect of the present invention, the reducing agent is urea.

  ADVANTAGE OF THE INVENTION According to this invention, the working machine which can suppress the overheating of the reducing agent in liquid feeding can be provided.

A perspective view showing composition of excavator 100 concerning a 1st embodiment. The top view which shows the internal structure of the hydraulic shovel 100 which concerns on 1st embodiment. The schematic diagram which shows the structure of the exhaust system which concerns on 1st Embodiment. The schematic diagram for demonstrating the structure of the air pipe 300 which concerns on 1st Embodiment. Sectional drawing for demonstrating the structure of the air pipe 300 which concerns on 1st Embodiment. The top view which shows the internal structure of the hydraulic excavator 100 which concerns on 2nd Embodiment. The schematic diagram for demonstrating the structure of the air pipe 300 which concerns on 2nd Embodiment. The top view which shows the internal structure of the hydraulic excavator 100 which concerns on 3rd Embodiment. Schematic for demonstrating the structure of the air pipe 300 which concerns on 3rd Embodiment. The top view which shows the internal structure of the hydraulic shovel 100 which concerns on embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

1. 1st Embodiment (Whole structure of the hydraulic shovel 100)
An overall configuration of a hydraulic excavator 100 (an example of a work machine) according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a hydraulic excavator 100 according to the present embodiment.

The excavator 100 includes a lower traveling body 10, a swivel base 20, a counterweight 30, an equipment room 40, an engine room 50, a work implement 60, and a cab 70.
The lower traveling body 10 has a pair of crawler belts 11 and 12 that can rotate independently of each other. The excavator 100 moves back and forth and right and left by rotating the pair of crawler belts 11 and 12.

  The swivel base 20 is supported on the lower traveling body 10 so as to be turnable. The swivel base 20 constitutes a vehicle body frame of the excavator 100. On the swivel base 20, a counterweight 30, an engine room 50, an equipment room 40, a work implement 60, and a cab 70 are arranged.

  The counterweight 30 is disposed behind the engine chamber 50. The counterweight 30 is formed, for example, by putting scrap iron, concrete, or the like in a box assembled from steel plates.

The equipment room 40 is disposed in front of the engine room 50. The equipment room 40 houses a reducing agent tank 41, a fuel tank 42, and the like, which will be described later (see FIG. 2).
The engine room 50 is disposed in front of the counterweight 30 and behind the equipment room 40. The engine chamber 50 accommodates an engine 51, an exhaust gas treatment device 53, a selective catalytic reduction device (Selective Catalytic Reduction) 54, and the like, which will be described later (see FIG. 2).

  The work machine 60 is disposed in front of the equipment room 40 and is attached to the swivel base 20. The work machine 60 includes a boom 61, an arm 62 attached to the tip of the boom 61, and a bucket 63 attached to the tip of the arm 62. The boom 61, the arm 62, and the bucket 63 are driven by supplying hydraulic oil to the hydraulic cylinders 61a, 62a, and 63a.

  The cab 70 is a cab where an operator of the excavator 100 rides. The cab 70 is provided in front of the engine chamber 50 and on the side of the work implement 60 so that the operator can look over the movement of the work implement 60.

(Internal configuration of hydraulic excavator 100)
Next, the internal configuration of the excavator 100 according to the present embodiment will be described with reference to the drawings. FIG. 2 is a plan view showing an internal configuration of the excavator 100 according to the present embodiment. FIG. 3 is a schematic diagram showing the configuration of the exhaust system according to the present embodiment.

As shown in FIG. 2, the excavator 100 includes a reducing agent tank 41, a fuel tank 42, a reducing agent supply device 43, a feed pipe 44, and a return pipe 45 in the equipment chamber 40.
The reducing agent tank 41 stores a reducing agent used in the selective catalyst reduction device 54. For example, urea is preferably used as the reducing agent, but is not limited thereto. In addition, since urea may be deteriorated by being heated to a high temperature of about 70 ° C. or higher, it is preferably stored in an atmosphere as low as possible.

The fuel tank 42 stores fuel supplied to the engine 51. The fuel tank 42 is disposed behind the reducing agent tank 41 and is in contact with the reducing agent tank 41.
The reducing agent supply device 43 is disposed behind the fuel tank 42. A liquid supply pipe 200 described later is connected to the reducing agent supply device 43, and the reducing agent supply apparatus 43 pumps the reducing agent to the liquid supply pipe 200 at a constant flow rate. The reducing agent supply device 43 is connected to the reducing agent tank 41 via a feed pipe 44 and a return pipe 45. The feed pipe 44 is a pipe for sending the reducing agent from the reducing agent tank 41 to the reducing agent supply apparatus 43, and the return pipe 45 is a pipe for returning the reducing agent from the reducing agent supply apparatus 43 to the reducing agent tank 41. It is.

  2 and 3, the excavator 100 includes an engine 51, a fan 52, an exhaust gas treatment device 53, a selective catalyst reduction device 54, a connecting pipe 55, a reducing agent administration device 56, and an engine chamber 50. An exhaust pipe 57 is provided. In the present embodiment, the exhaust gas treatment device 53, the selective catalyst reduction device 54, the connecting pipe 55, and the exhaust pipe 57 constitute an exhaust system for exhausting the exhaust gas of the engine 51 to the outside.

The fan 52 is disposed on the opposite side of the exhaust system across the engine 51. The fan 52 generates cooling air toward the engine 51 by rotating a rotor blade (not shown).
The exhaust gas treatment device 53 reduces nitrogen oxide (NOx), carbon monoxide (CO) or particulate matter in the exhaust gas discharged from the engine 51.

  The selective catalyst reduction device 54 is arranged at the rear stage of the exhaust gas treatment device 53 and is connected to the exhaust gas treatment device 53 via a connecting pipe 55. The selective catalyst reduction device 54 reduces NOx remaining in the exhaust gas treated by the exhaust gas treatment device 53 with the reducing agent administered from the reducing agent administration device 56.

  The connecting pipe 55 communicates with the exhaust gas treatment device 53 and the selective catalyst reduction device 54, and sends the exhaust gas processed by the exhaust gas treatment device 53 to the selective catalyst reduction device 54. The connecting pipe 55 constitutes an “exhaust path” for discharging exhaust gas discharged from the engine 51.

  The reducing agent administration device 56 is attached to the side surface of the connecting pipe 55. The reducing agent administration device 56 has a spray nozzle disposed inside the connecting pipe 55, and sprays the reducing agent from the spray nozzle into the connecting pipe 55 (exhaust path). A liquid supply pipe 200 is connected to the reducing agent administration device 56, and the reducing agent is supplied from the liquid supply pipe 200 at a constant flow rate.

The exhaust pipe 57 is connected to the selective catalyst reduction device 54. The exhaust pipe 57 sends out the exhaust gas treated by the exhaust gas treatment device 53 and the selective catalyst reduction device 54 to the outside of the vehicle.
As shown in FIG. 2, the hydraulic excavator 100 includes a main valve 80, a hydraulic oil tank 90, a liquid supply pipe 200, and an air supply pipe 300.

  The main valve 80 is disposed in front of the engine 51. The main valve 80 supplies hydraulic oil to the work machine 60. The hydraulic oil tank 90 stores the hydraulic oil that returns from the work machine 60.

  The liquid feeding tube 200 communicates with the reducing agent supply device 43 and the reducing agent administration device 56. The liquid feeding pipe 200 is a pipe for sending the reducing agent from the reducing agent supply device 43 to the reducing agent administration device 56. In this embodiment, most of the liquid supply pipe 200 is covered with the air supply pipe 300, and only both end portions of the liquid supply pipe 200 are exposed from the air supply pipe 300. Note that the flow rate of the reducing agent flowing in the liquid feeding pipe 200 corresponds to the spray amount from the spray nozzle of the reducing agent administration device 56 and is extremely slow (for example, several cm / second).

  The air supply pipe 300 is a pipe for sending air, and covers most of the liquid supply pipe 200. Specifically, as shown in FIG. 2, the liquid supply pipe 200 passes through a position adjacent to the main valve 80, and the air supply pipe 300 covers a portion of the liquid supply pipe 200 adjacent to the main valve 80. ing. The liquid supply pipe 200 passes through a position in front of the engine 51 and adjacent to the engine 51, and the air supply pipe 300 covers a portion of the liquid supply pipe 200 adjacent to the engine 51. Furthermore, the liquid supply pipe 200 is piped along the front wall 50A of the engine room 50, and the air supply pipe 300 covers a portion of the liquid supply pipe 200 along the front wall 50A.

  In addition, the air supply pipe 300 includes a covering portion 310 that covers the liquid supply pipe 200, a first end portion 320 having an exhaust port 300A, and a second end portion 330 having an intake port 300B. The first end portion 320 is connected to an end portion of the covering portion 310 on the reducing agent supply device 43 side. The second end portion 330 is connected to an end portion of the covering portion 310 on the reducing agent administration device 56 side.

  Here, FIG. 4 is a schematic diagram for explaining the function of the air supply tube 300. As shown in FIG. 4, the tip of the first end 320 is disposed on the opposite side of the engine 51 with the fan 52 interposed therebetween. That is, the exhaust port 300 </ b> A is located on the upstream side of the fan 52. Accordingly, when the cooling air is generated by the rotation of the rotor blades of the fan 52, air is sucked out from the exhaust port 300A due to the negative pressure generated upstream of the fan 52, and in response to this, air is sucked out from the intake port 300B. Inhaled. In this embodiment, the flow of air in the air supply pipe 300 and the flow of reducing agent in the liquid supply pipe 200 are in opposite directions.

  FIG. 5 is a cross-sectional view for explaining the configuration of the cladding tube 310 in the air supply tube 300. As shown in FIG. 5, the cladding tube 310 is constituted by a tube body 311 and a heat insulating material 312. The pipe body 311 has a second outer diameter b (for example, 10 cm or less) larger than the first outer diameter a (for example, 5 cm or less) of the liquid feeding pipe 200. The heat insulating material 312 is disposed along the inner surface of the pipe body 311 and surrounds the liquid feeding pipe 200. In the gap between the heat insulating material 312 and the liquid feeding pipe 200, an air flow path 313 for allowing air sucked from the air inlet 300B to pass therethrough is formed.

(Function and effect)
(1) The hydraulic excavator 100 according to the present embodiment includes an air supply pipe 300 having an intake port 300B and an exhaust port 300A and covering most of the liquid supply pipe 200. Therefore, the reducing agent flowing in the liquid supply pipe 200 can be cooled by the air flowing in the air supply pipe 300 from the intake port 300B toward the exhaust port 300A. Therefore, it can suppress that a reducing agent overheats during liquid feeding.

  (2) The exhaust port 300 </ b> A is disposed on the upstream side of the fan 52. Therefore, by using the negative pressure generated on the upstream side of the fan 52, the air can be efficiently flowed into the air supply pipe 300.

  (3) The air supply pipe 300 covers a portion of the liquid supply pipe 200 adjacent to the main valve 80. Therefore, it is possible to suppress the liquid feeding pipe 200 from being heated by the heat of the main valve 80.

(4) The air supply pipe 300 covers a portion of the liquid supply pipe 200 adjacent to the engine 51. Therefore, the liquid feeding pipe 200 can be prevented from being heated by the heat of the engine 51.
(5) The liquid feeding pipe 200 passes through the front of the engine and is piped along the front wall 50 </ b> A of the engine room 50. Therefore, the arrangement area of the liquid feeding pipe 200 can be reduced as compared with the case where the rear of the engine 51 is passed in order to avoid heating by the heat of the engine 51.

(6) The air supply pipe 300 has a heat insulating material 312 disposed inside. Therefore, since the heat shielding effect by the air pipe 300 can be further improved, the overheating of the reducing agent can be further suppressed.
(7) The reducing agent tank 41 is in contact with the fuel tank 42. Therefore, the reducing agent stored in the reducing agent tank 41 can be cooled by heat transfer from the reducing agent tank 41 to the fuel tank 42. Accordingly, it is possible to suppress the reducing agent from reaching the alteration temperature during liquid feeding.

2. Second Embodiment Hereinafter, a configuration of a hydraulic excavator 100 according to a second embodiment will be described with reference to the drawings. Since the difference from the first embodiment is in the configuration of the air supply tube 300, the difference will be mainly described below.

(Internal configuration of hydraulic excavator 100)
FIG. 6 is a plan view showing the internal configuration of the excavator 100 according to the second embodiment. FIG. 7 is a schematic diagram showing a configuration of an air supply tube 300 according to the second embodiment.

  As shown in FIGS. 6 and 7, the air supply pipe 300 covers most of the liquid supply pipe 200. The air supply pipe 300 includes a covering part 310 that covers the liquid supply pipe 200 and a third end part 340 having an exhaust port 300A. The covering portion 310 has an intake port 300B formed at the tip on the reducing agent supply device 43 side. The third end 340 is connected to the end of the covering portion 310 on the reducing agent administration device 56 side.

  Here, the tip of the third end 330 is disposed on the opposite side of the engine 51 with the fan 52 interposed therebetween. That is, the exhaust port 300 </ b> A is located on the upstream side of the fan 52. Accordingly, when the cooling air is generated by the rotation of the rotor blades of the fan 52, air is sucked out from the exhaust port 300A due to the negative pressure generated upstream of the fan 52, and in response to this, air is sucked out from the intake port 300B. Inhaled. In the present embodiment, the air flow in the air supply pipe 300 and the reducing agent flow in the liquid supply pipe 200 are in the same direction.

(Function and effect)
According to the air supply pipe 300 according to the second embodiment, the reducing agent flowing in the liquid supply pipe 200 can be cooled by the air flowing in the air supply pipe 300 as in the first embodiment. Therefore, it can suppress that a reducing agent overheats during liquid feeding.

3. Third Embodiment Hereinafter, a configuration of a hydraulic excavator 100 according to a third embodiment will be described with reference to the drawings. Since the difference from the first embodiment is in the configuration of the air supply tube 300, the difference will be mainly described below.

(Internal configuration of hydraulic excavator 100)
FIG. 8 is a plan view showing the internal configuration of the excavator 100 according to the third embodiment. FIG. 9 is a schematic diagram illustrating a configuration of an air supply tube 300 according to the third embodiment.

  As shown in FIGS. 8 and 9, the air supply pipe 300 covers most of the liquid supply pipe 200. The air supply pipe 300 includes a covering portion 310 that covers the liquid supply pipe 200 and a fourth end portion 350 having an exhaust port 300A. The covering portion 310 has an intake port 300B formed at the tip on the reducing agent supply device 43 side. The fourth end 350 is connected to the end of the covering 310 on the reducing agent administration device 56 side.

  Here, the distal end of the fourth end portion 350 is disposed in the exhaust pipe 57 as shown in FIG. Therefore, when the exhaust gas flows through the exhaust pipe 57, air is sucked out from the exhaust port 300A due to the venturi effect due to the flow of the exhaust gas, and air is sucked from the intake port 300B accordingly. In the present embodiment, the air flow in the air supply pipe 300 and the reducing agent flow in the liquid supply pipe 200 are in the same direction.

(Function and effect)
According to the air supply pipe 300 according to the third embodiment, the reducing agent flowing in the liquid supply pipe 200 can be cooled by the air flowing in the air supply pipe 300 as in the first embodiment. Therefore, it can suppress that a reducing agent overheats during liquid feeding.

  Further, since the exhaust port 300A is disposed in the exhaust pipe 57, air can be efficiently sucked out from the exhaust port 300A by utilizing the venturi effect associated with the flow of exhaust gas. Therefore, since air can be efficiently flowed into the air supply pipe 300, it is possible to further suppress the overheating of the reducing agent during the liquid supply.

(Other embodiments)
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.
(A) In the above embodiment, the air supply pipe 300 covers most of the liquid supply pipe 200, but the present invention is not limited to this. The air supply pipe 300 only needs to cover at least a part of the liquid supply pipe 200, and may completely cover the entire liquid supply pipe 200.

  (B) In the above embodiment, the piping paths of the liquid feeding pipe 200 and the air feeding pipe 300 have been described in FIGS. 2, 3, and 8, but these piping paths can be appropriately changed depending on the internal configuration of the excavator 100. For example, as shown in FIG. 10, the liquid supply pipe 200 and the air supply pipe 300 are piped according to the arrangement position of the reducing agent supply device 43 and the fan 52 in the rear of the cab 70 and in the vicinity of the front wall 50 </ b> A of the engine chamber 50. It only has to be done. The liquid supply pipe 200 and the air supply pipe 300 may be routed along the rear wall of the engine room 50 or may be routed inside the counterweight 30.

  (C) In the above embodiment, the air is flowed into the air supply pipe 300 using the negative pressure generated by the cooling air or the venturi effect generated by the exhaust gas, but the present invention is not limited to this. For example, air may be flowed into the air supply pipe 300 by attaching a blower fan to the exhaust port 300A or the air intake port 300B of the air supply pipe 300.

  (D) Although not particularly mentioned in the above embodiment, a heating wire may be incorporated in the air pipe 300. In this case, when the reducing agent in the liquid feeding tube 200 is frozen, the reducing agent in the liquid feeding tube 200 can be easily thawed by causing a current to flow through the heating wire to generate heat.

  (E) In the above embodiment, the reducing agent in the reducing agent tank 41 is cooled by bringing the reducing agent tank 41 into contact with the fuel tank 42. However, the present invention is not limited to this. For example, the reducing agent in the reducing agent tank 41 can be cooled also by arranging the reducing agent tank 41 on the upstream side of the fan 52.

  (F) Although the hydraulic excavator has been described as an example of a work machine in the above embodiment, the present invention is not limited to this. Examples of work machines include motor graders and bulldozers.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 10 ... Lower traveling body, 11, 12 ... A pair of crawler belts, 20 ... Turning platform, 30 ... Counterweight, 40 ... Equipment room, 41 ... Reductant tank, 42 ... Fuel tank, 43 ... Reductant supply apparatus, 44 ... Feed Piping, 45 ... return piping, 50 ... engine room, 51 ... engine, 52 ... fan, 53 ... exhaust gas treatment device, 54 ... selective catalyst reduction device, 55 ... connecting pipe, 56 ... reducing agent administration device, 57 ... exhaust pipe, DESCRIPTION OF SYMBOLS 60 ... Work machine, 70 ... Cab, 80 ... Main valve, 100 ... Hydraulic excavator, 200 ... Liquid supply pipe, 300 ... Air supply pipe, 300A ... Exhaust port, 300B ... Intake port, 310 ... Cladding pipe, 311 ... Pipe body, 312 ... Insulating material, 320-360 ... End of air pipe

JP 2010-261373 A

Claims (11)

A reducing agent supply device for supplying the reducing agent;
A reducing agent administration device that administers the reducing agent into the exhaust path;
A liquid supply pipe communicating with the reducing agent supply device and the reducing agent administration device, and for sending the reducing agent from the reducing agent supply device to the reducing agent administration device;
An air supply pipe having an intake port and an exhaust port, and covering at least a part of the liquid supply pipe;
A selective catalytic reduction device connected to the exhaust path;
Work machine equipped with. With a fan,
The exhaust port is disposed on the upstream side of the fan.
The work machine according to claim 1. An exhaust pipe connected to the selective catalyst reduction device;
With
The exhaust port is disposed in the exhaust pipe.
The work machine according to claim 1. A working machine,
A main valve for supplying hydraulic oil to the working machine;
With
The liquid feeding pipe passes through a position adjacent to the main valve,
The air supply pipe covers a portion of the liquid supply pipe adjacent to the main valve,
The work machine according to any one of 1 to 3 above. Engine,
An engine room for storing the engine;
With
The liquid supply pipe passes through a position adjacent to the engine,
The air supply pipe covers a portion of the liquid supply pipe adjacent to the engine,
The work machine according to any one of 1 to 4 above. The reducing agent supply device is disposed in front of the engine,
The liquid supply pipe passes through the front of the engine.
The work machine according to claim 5. The liquid feeding pipe is piped along the front wall of the engine room,
The work machine according to claim 6. The air pipe has a heat insulating material disposed inside,
The work machine according to any one of 1 to 7 above. A reducing agent tank for storing a reducing agent supplied to the reducing agent supply device;
A fuel tank for storing fuel supplied to the engine;
With
The reducing agent tank is in contact with the fuel tank;
The work machine according to claim 1. With fans,
A reducing agent tank for storing a reducing agent supplied to the reducing agent supply device;
With
The reducing agent tank is disposed on the upstream side of the fan.
The work machine according to claim 1. The reducing agent is urea;
The work machine according to any one of 1 to 10 above.

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