JP2005147428A - Heat exchanging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently clean dust attached to a heat exchanger. <P>SOLUTION: A nozzle 21 is mounted in a shroud 16 mounted between a cooling fan 12 and a radiator 13 vertically movable along a heat radiating part 13A of a radiator 13, and a compressed air is injected toward the heat radiating part 13A of the radiator 13 from an injection hole 23 of the nozzle 21. As the compressed air from the nozzle 21 can be intensively injected to the dust 35 attached to the heat radiating part 13A while vertically moving the nozzle 21 along the heat radiating part 13A of the radiator 13, the dust 35 can be surely eliminated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchange device suitably used for cooling an engine or the like, for example.

  In general, a construction machine such as a hydraulic excavator is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front and rear side of the upper revolving body that can be moved up and down. It is roughly constituted by the working device.

  Further, the upper swing body is provided with a swing frame, a cab provided on the swing frame and defining a driver's cab, a counterweight provided on the rear end side of the swing frame, and a front side of the counterweight. The building cover includes an engine, a heat exchange device, and the like.

  The heat exchanging device is usually a cooling fan that generates cooling air, a radiator that is provided to face the cooling fan and that exchanges heat of the fluid to be cooled when the cooling air passes through the heat radiating unit, an oil cooler, and the like The heat exchanger is generally configured. In addition to these cooling fans and heat exchangers, there is also known a heat exchange device provided with a cleaning means for cleaning dust adhering to the heat radiating part of the heat exchanger (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-51595

  Here, the cleaning means of the heat exchanger according to the prior art is that a nozzle is attached to a shroud provided between the cooling fan and the heat exchanger, and the cleaning water sprayed from the nozzle into the shroud is cooled by the cooling fan. By spraying on the heat exchanger using wind, the dust attached to the heat radiating portion of the heat exchanger is cleaned.

  However, the above-described conventional cleaning means is configured to spray the cleaning water from the nozzle into the shroud and then spray the cleaning water to the heat exchanger using the cooling air from the cooling fan. Yes. For this reason, the cleaning water spreads in the form of a mist over almost the entire surface of the heat exchanger by the cooling air, and accordingly, the momentum of the cleaning water sprayed on the heat radiating portion of the heat exchanger is weakened. Thus, the cleaning means according to the prior art cannot intensively inject cleaning water toward the dust adhering to the heat radiating portion of the heat exchanger, and it is difficult to reliably remove the dust. There's a problem.

  Further, in the conventional cleaning means, the direction of the flow of the cooling air passing through the heat radiating portion of the heat exchanger is equal to the direction of the flow of the cleaning water blown to the heat exchanger by the cooling air. For this reason, although the dust adhering to the site on the upstream side of the cooling air in the heat radiating portion of the heat exchanger can be washed with the washing water, it adheres to the site on the downstream side of the cooling air in the heat radiator. Washing water is difficult to reach the dust. Therefore, there is a problem that dust that cannot be cleaned easily accumulates in a portion on the downstream side of the cooling air in the heat radiating portion of the heat exchanger.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a heat exchange device capable of efficiently cleaning dust adhering to a heat radiating portion of a heat exchanger.

  In order to solve the above-described problems, the present invention provides a cooling fan that generates cooling air, and a heat exchanger that is provided to face the cooling fan and exchanges heat of the fluid to be cooled when the cooling air passes through the heat radiating unit. And a cleaning means for cleaning dust adhering to the heat radiating part while the cooling air passes through the heat radiating part of the heat exchanger.

  The invention according to claim 1 is characterized in that the cleaning means is provided so as to be movable along the heat radiating portion of the heat exchanger and is used for cleaning in a direction opposite to the direction of the flow of the cooling air toward the heat radiating portion. That is, the nozzle is configured to eject a fluid.

  According to a second aspect of the present invention, the nozzle is provided between the heat radiating portion of the heat exchanger and the cooling fan, and a cylinder is provided with a cleaning fluid therein. That is, it is constituted by an injection hole for injecting a cleaning fluid toward the heat radiating portion of the exchanger.

  According to a third aspect of the present invention, a shroud is provided between the cooling fan and the heat exchanger to guide the cooling air from the cooling fan to the heat radiating portion of the heat exchanger, and the nozzle is disposed in the shroud. The configuration is such that it can be moved up and down along the heat dissipating part.

  According to a fourth aspect of the present invention, a nozzle raising / lowering mechanism is provided in the shroud to raise and lower the nozzle along the heat radiating portion of the heat exchanger from the outside of the shroud.

  The invention of claim 5 is configured such that the shroud is provided with a nozzle storage portion that stores the nozzle at a position that does not interfere with the flow of the cooling air when the cooling air from the cooling fan passes through the heat radiating portion of the heat exchanger. There is.

  According to the first aspect of the present invention, the cleaning fluid can be intensively ejected from the nozzle toward the heat radiating portion of the heat exchanger, and dust attached to the heat radiating portion of the heat exchanger is removed by the fluid. be able to. Then, the dust attached to the heat radiating portion can be efficiently removed over a wide range by moving the nozzle along the heat radiating portion of the heat exchanger while ejecting the cleaning fluid from the nozzle. In this case, since the fluid from the nozzle is jetted in the direction opposite to the flow direction of the cooling air toward the heat radiating portion of the heat exchanger, the fluid is discharged from the heat radiating portion of the heat exchanger to the downstream side of the cooling air. The adhering dust can be reliably removed by the fluid ejected from the nozzle.

  According to the second aspect of the present invention, even when it is not possible to secure a clearance enough for an operator's hand to enter between the heat radiating portion of the heat exchanger and the cooling fan, the cylinder of the nozzle provided in this narrow clearance By supplying the cleaning fluid into the body, the cleaning fluid can be ejected from the injection hole of the cylindrical body toward the heat radiating portion of the heat exchanger. Thereby, the dust adhering to the surface which faces a cooling fan among the thermal radiation parts of a heat exchanger can be efficiently removed with the fluid which injects from a nozzle.

  According to the invention of claim 3, the nozzle is moved up and down in a shroud provided between the cooling fan and the heat exchanger, so that the heat radiating part of the heat exchanger can be shortened in a short time. The fluid can be ejected over a wide range, and workability when cleaning the heat radiating portion of the heat exchanger can be improved.

  Further, according to the invention of claim 4, by operating the nozzle lifting mechanism, the nozzle can be lifted up and down along the heat radiating portion of the heat exchanger from the outside of the shroud. Even when a clearance sufficient for an operator to enter between the cooling fan and the cooling fan cannot be secured, dust adhering to the heat radiating portion of the heat exchanger can be easily removed over a wide range.

  Further, according to the invention of claim 5, when the cooling air from the cooling fan is supplied to the heat radiating portion of the heat exchanger, the heat radiating portion of the heat exchanger is stored by storing the nozzle in the nozzle housing portion provided in the shroud. It is possible to prevent the flow of cooling air passing through the nozzle from being obstructed by the nozzle, and heat exchange in the heat radiating portion can be promoted by a large amount of cooling air.

  Hereinafter, a case where an embodiment of a heat exchange device 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 8.

  In the figure, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, an upper revolving body 3 that is turnable on the lower traveling body 2, and an upper revolving body 3. And the working device 4 provided so as to be able to move up and down on the front side.

  The upper swing body 3 includes a swing frame 5 serving as a base, a cab 6 provided on the left side of the front portion of the swing frame 5 to define a driver's cab, and a work device 4 provided on the rear side of the swing frame 5. Counterweight 7 and a building cover 8 to be described later.

  Here, as shown in FIG. 2, the revolving frame 5 is located at the center part in the left and right directions and extends in the front and rear directions, and is located on both the left and right sides of the center frame 5A. The left and right side frames 5B and 5C extending in the front and rear directions, and a plurality of overhanging beams 5D extending in the left and right directions and connecting the center frame 5A and the side frames 5B and 5C. Yes. An engine 9 described later is mounted on the center frame 5A.

  A building cover 8 is provided on the revolving frame 5 and is located on the front side of the counterweight 7. The building cover 8 accommodates an engine 9, a heat exchange device 11, and the like which will be described later. Further, the building cover 8 is provided with a large number of ventilation holes 8A, and the engine 9 is operated to rotate a cooling fan 12 described later, whereby outside air is sucked into the building cover 8 through the ventilation holes 8A. It has become.

  Reference numeral 9 denotes an engine mounted on the revolving frame 5 in the building cover 8, and the engine 9 extends left and right on the center frame 5A of the revolving frame 5 as shown in FIG. Installed horizontally. Here, a cooling fan 12 is attached to the left side of the engine 9, and a hydraulic pump 10 is attached to the right side of the engine 9. The hydraulic pump 10 is driven by the engine 9 to be used for various hydraulic actuators such as a hydraulic motor of the traveling device, a hydraulic motor of the turning device (none of which is shown), and a hydraulic cylinder provided in the working device 4. Hydraulic oil (pressure oil) is supplied.

  Reference numeral 11 denotes a heat exchange device provided in the building cover 8 together with the engine 9 and the like. The heat exchange device 11 includes a cooling fan 12, a radiator 13, an oil cooler 15, a shroud 16, a nozzle 21 and the like which will be described later. .

  Reference numeral 12 denotes a suction-type cooling fan attached to the engine 9. The cooling fan 12 is driven to rotate by the engine 9, and sucks outside air into the building cover 8 through the vent 8 </ b> A of the building cover 8. The outside air is supplied as cooling air to the radiator 13, the oil cooler 15, the engine 9 and the like as shown by an arrow A in FIG.

  Reference numeral 13 denotes a radiator as a heat exchanger provided facing the cooling fan 12, and the radiator 13 is located upstream of the cooling fan 12 in the direction of the flow of cooling air (the direction of arrow A in FIG. 2). Arranged and fixed on the upper surface 14 </ b> A of the support base 14 attached to the revolving frame 5.

  Here, the radiator 13 includes a heat radiating portion 13A composed of a plurality of flow pipes 13A1 through which engine coolant flows and a large number of heat radiating fins 13A2, an upper tank 13B disposed on the upper side of the heat radiating section 13A and communicating with each flow pipe 13A1, A lower tank 13C that is disposed below the heat radiating portion 13A and communicates with each of the flow pipes 13A1 is roughly configured. The radiator 13 dissipates the heat of the engine cooling water flowing through each of the flow pipes 13A1 into the cooling air through the radiation fins 13A2 when the cooling air from the cooling fan 12 passes through the heat radiating portion 13A. Cooling water is cooled.

  15 is an oil cooler as a heat exchanger fixed on the support base 14 together with the radiator 13, and the oil cooler 15 is upstream of the radiator 13 in the direction of the flow of cooling air (the direction of arrow A in FIG. 2). Arranged on the side. Here, as with the radiator 13, the oil cooler 15 includes a heat radiating portion 15A composed of a plurality of flow pipes through which return oil from each hydraulic actuator circulates and a large number of heat radiating fins (all not shown), and a heat radiating portion 15A. The upper tank 15B disposed on the upper side of the radiating portion and the lower tank 15C disposed on the lower side of the heat radiating portion 15A are roughly configured. The oil cooler 15 cools the working oil by radiating the heat of the return oil from each hydraulic actuator into the cooling air when the cooling air from the cooling fan 12 passes through the heat radiating portion 15A.

  Reference numeral 16 denotes a shroud provided between the cooling fan 12 and the radiator 13, and the shroud 16 is fixed to the radiator 13 with a bolt or the like, for example, as shown in FIGS. 3 to 5. A rectangular box-like portion 16A extending upward and downward along the portion 13A, and a cylindrical portion 16B that protrudes from the box-like portion 16A toward the cooling fan 12 and surrounds the cooling fan 12 from the outer peripheral side. ing. The shroud 16 guides the cooling air introduced into the building cover 8 by the rotation of the cooling fan 12 to the heat radiating portion 13A of the radiator 13 and the heat radiating portion 15A of the oil cooler 15.

  Here, in the box-shaped portion 16 </ b> A constituting the shroud 16, a later-described nozzle 21, a nozzle lifting mechanism 31, and the like are provided. Further, as shown in FIG. 3, the lower surface side of the box-shaped portion 16A constituting the shroud 16 extends downward from the upper surface 14A of the support base 14, and serves as a nozzle storage portion 16C for storing a nozzle 21 described later. . Further, an opening 16D through which an air hose 24 (to be described later) and the ropes 32 and 33 are inserted is formed on the upper surface side of the box-shaped portion 16A.

  Reference numeral 21 denotes a nozzle as a cleaning means provided between the cooling fan 12 and the radiator 13, and the nozzle 21 is provided in the box-shaped portion 16 </ b> A of the shroud 16 so as to be movable up and down. As shown in FIGS. 3 to 5, the nozzle 21 is formed using a pipe material or the like, and extends in the forward and rearward directions along the heat radiation portion 13A of the radiator 13, and the cylindrical body. 22 are arranged in parallel in the length direction of 22 and are constituted by a large number of injection holes 23, 23,... Opened toward the heat radiating portion 13 A of the radiator 13.

  Here, both ends in the length direction of the cylindrical body 22 are closed, and a hose connection port 22 </ b> A is provided on one end side in the length direction of the cylindrical body 22. One end side of the air hose 24 is connected to the hose connection port 22A of the cylindrical body 22, and the other end side of the air hose 24 extends to the outside of the shroud 16 through an opening 16D provided in the box-shaped portion 16A of the shroud 16. It is configured to be connected to an air compressor (not shown).

  Accordingly, the air compressor generates compressed air as a cleaning fluid, and this compressed air is supplied into the cylindrical body 22 of the nozzle 21 through the air hose 24, so that the radiator 13 The compressed air is jetted toward the heat radiating portion 13A and the like.

  In addition, front and rear brackets 25 and 26 made of a rectangular plate are fixed to both ends in the length direction of the cylindrical body 22 by welding or the like. As shown in FIG. 5, on the upper side of the front bracket 25, one rope insertion hole 25 </ b> A through which a later-described first rope 32 is inserted and a rope insertion through which a later-described second rope 33 is inserted. A hole 25 </ b> B is formed, and a rope insertion hole 26 </ b> A through which a later-described first rope 32 is inserted is formed on the upper side of the rear bracket 26.

  Reference numeral 27 denotes a nozzle guide member provided in the box-shaped portion 16A of the shroud 16, and the nozzle guide member 27 extends upward and downward while facing the front and rear directions, as shown in FIGS. The front and rear rails 28 and 29 and the bottom plate 30 fixed to the lower ends of the front and rear rails 28 and 29 are configured.

  Here, the front and rear rails 28 and 29 are formed using, for example, a groove-shaped member having a U-shaped cross section, and extend upward and downward along the radiator 13 with the openings facing each other. ing. A front bracket 25 fixed to the nozzle 21 is slidably inserted into the front rail 28, and a rear bracket 26 fixed to the nozzle 21 is slidably inserted into the rear rail 29. ing. Accordingly, the nozzle 21 is guided along the heat radiation portion 13A of the radiator 13 while being guided by the rails 28 and 29 with the front and rear brackets 25 and 26 being in sliding contact with the front and rear rails 28 and 29, respectively. It is configured to move up and down. Further, a rope locking tool 28A for locking a base end portion of a first rope 32 to be described later protrudes from the upper end portion of the front rail 28, and a second rope to be described later is provided to the upper end portion of the rear rail 29. A rope locking tool 29 </ b> A for locking the base end portion of 33 is projected.

  On the other hand, the bottom plate 30 is formed of a rectangular plate extending in the front and rear directions, and both end portions in the length direction are fixed to the lower end portions of the front and rear rails 28 and 29 by welding or the like. The lower end sides of 28 and 29 are closed. Therefore, the nozzle 21 that is guided by the front and rear rails 28 and 29 and moves up and down is placed on the bottom plate 30 when it moves downward, and is stored in the nozzle storage portion 16C of the shroud 16. It becomes the composition which is done.

  Thereby, when the cooling fan 12 rotates, as indicated by an arrow A in FIG. 3, the cooling air that passes through the heat radiating portion 15 </ b> A of the oil cooler 15 and the heat radiating portion 13 </ b> A of the radiator 13 toward the cooling fan 12. This flow passes above the nozzle 21 stored in the nozzle storage portion 16C of the shroud 16, and the flow of the cooling air can be prevented from being obstructed by the nozzle 21.

  Reference numeral 31 denotes a nozzle raising / lowering mechanism provided in the box-shaped portion 16 </ b> A of the shroud 16. The nozzle raising / lowering mechanism 31 moves the nozzle 21 up and down from the outside of the shroud 16. And the nozzle raising / lowering mechanism 31 is comprised by the below-mentioned 1st rope 32, the 2nd rope 33, the operation tool 34, etc. FIG.

  32 is a first rope made of a wire rope or the like. As shown in FIGS. 3 and 5, the first rope 32 is locked at one end by a rope locking tool 29A of the rear rail 29, and an intermediate portion is The rope 21 is inserted into the rope insertion hole 26 </ b> A of the rear bracket 26 fixed to the nozzle 21 and the rope insertion hole 25 </ b> A of the front bracket 25. The other end of the first rope 32 is drawn out of the shroud 16 through the opening 16D of the shroud 16 and connected to an operation tool 34 described later.

  Reference numeral 33 denotes a second rope made of a wire rope or the like. The second rope 33 has one end locked to the rope locking tool 28 </ b> A of the front rail 28, and the rope of the front bracket 25 fixed to the nozzle 21. It is inserted through the insertion hole 25B. The other end of the second rope 33 is drawn out of the shroud 16 through the opening 16D of the shroud 16 and connected to the operation tool 34.

  Reference numeral 34 denotes an operating tool that is operated upward and downward by an operator. The operating tool 34 includes a second end portion of the first rope 32 drawn out of the shroud 16 and a second end portion of the second rope 33. To be connected. Here, the operation tool 34 is formed in a rod shape longer than the hole diameter of the opening 16D provided in the shroud 16, for example, and is moved upward and downward by an operator holding the operation tool 34.

  When the operator moves the operation tool 34 upward, the other ends of the ropes 32 and 33 are pulled upward, so that the nozzle 21 is guided to the rails 28 and 29 of the nozzle guide member 27. It rises along the heat dissipating part 13A of the radiator 13. On the other hand, when the operator moves the operation tool 34 downward, the nozzle 21 descends along the heat radiation portion 13A of the radiator 13 while being guided by the rails 28 and 29 of the nozzle guide member 27 by its own weight.

  In this manner, the nozzle 21 can be moved up and down from the outside of the shroud 16 by moving the operation tool 34 upward and downward. On the other hand, as shown in FIGS. 3 and 4, when the operation tool 34 is placed on the shroud 16, the nozzle 21 can be stored in the nozzle storage portion 16 </ b> C of the shroud 16.

  The heat exchanging device 11 according to the present embodiment has the above-described configuration. When the engine 9 operates and the cooling fan 12 rotates, outside air enters the building cover 8 through the vents 8A provided in the building cover 8. Is inhaled. Then, as shown by arrow A in FIG. 3, the outside air passes through the heat radiating portion 15A of the oil cooler 15 and the heat radiating portion 13A of the radiator 13, and cools the hydraulic oil in the heat radiating portion 15A. After the engine cooling water is cooled in the heat radiating portion 13 </ b> A, it is led out to the cooling fan 12 side through the shroud 16.

  At this time, the operation tool 34 of the nozzle lifting mechanism 31 is placed on the shroud 16 as shown in FIGS. 3 and 4, and the nozzle 21 is stored in the nozzle storage portion 16 </ b> C of the shroud 16. Thereby, the flow of the cooling air that passes through the heat radiating portion 15A of the oil cooler 15 and the heat radiating portion 13A of the radiator 13 and moves toward the cooling fan 12 is above the nozzle 21 stored in the nozzle storage portion 16C of the shroud 16. To go through. As a result, the flow of the cooling air is prevented from being obstructed by the nozzle 21, and a large amount of cooling air passes through the heat radiating portion 15 </ b> A of the oil cooler 15 and the heat radiating portion 13 </ b> A of the radiator 13. Heat exchange can be promoted.

  Here, since dust is mixed in the cooling air, for example, as shown in FIG. 3, the dust 35 adheres to each heat radiation fin 13 </ b> A <b> 2 constituting the heat radiation portion 13 </ b> A of the radiator 13. Similarly, dust also adheres to each radiating fin (not shown) constituting the radiating portion 15A of the oil cooler 15.

  Therefore, a cleaning operation for removing the dust 35 attached to the radiation fins 13A2 of the radiator 13 using the nozzle 21 provided between the cooling fan 12 and the radiator 13 will be described.

  First, with the engine 9 stopped and the cooling fan 12 stopped rotating, an air compressor (not shown) is operated, and compressed air generated by the air compressor is passed through an air hose 24 or the like to the cylinder of the nozzle 21. Supply into the body 22. Thereby, compressed air is injected from each injection hole 23 of the nozzle 21 toward the heat radiating portion 13 </ b> A of the radiator 13.

  In this state, the operator can move the nozzle 21 in the shroud 16 upward from the outside of the shroud 16 by grasping the operating tool 34 of the nozzle lifting mechanism 31 and moving the operating tool 34 upward. . As a result, as shown in FIGS. 6 and 7, the nozzle 21 is guided by the rails 28 and 29 of the nozzle guide member 27, and rises while maintaining a substantially constant distance from the radiator 13 </ b> A of the radiator 13. The compressed air is jetted toward the dust 35 attached to the heat radiating fins 13A2 of the heat radiating portion 13A.

  Here, since each injection hole 23 of the nozzle 21 is opened toward the heat radiating part 13A of the radiator 13, as shown by an arrow B in FIG. 6, the nozzle 21 is radiated from the cooling fan 12 side to the heat radiating part 13A. Compressed air can be intensively injected toward the heat radiating fins 13A2, and the dust 35 adhering to the heat radiating fins 13A2 can be reliably removed.

  Then, the operator moves the operation tool 34 upward and raises the nozzle 21 along the heat radiating portion 13A of the radiator 13, so that the compressed air injected from the nozzle 21 causes each heat radiating fin 13A2 of the heat radiating portion 13A to The attached dust 35 can be efficiently removed over a wide range.

  In this case, since the nozzle 21 is disposed between the cooling fan 12 and the heat exchanger 13, the compressed air from the nozzle 21 passes through the heat radiating portion 15 </ b> A of the oil cooler 15 and the heat radiating portion 13 </ b> A of the radiator 13. The direction from the cooling fan 12 toward the heat dissipating part 13A of the radiator 13 and the heat dissipating part 15A of the oil cooler 15 (in FIG. 6), opposite to the direction of the flow of the cooling air toward 12 (the direction of arrow A in FIG. 3). In the direction of arrow B). Thereby, the dust 35 adhering to the heat radiating portion 13A of the radiator 13 located on the downstream side in the cooling air flow direction in the heat exchanger 13 can be efficiently removed by the compressed air ejected from the nozzle 21.

  Further, when the operator moves the operation tool 34 of the nozzle lifting mechanism 31 upward and downward, the nozzle 21 can be lifted up and down along the heat dissipating portion 13A of the radiator 13 from the outside of the shroud 16. it can. As a result, even when a clearance sufficient for an operator's hand to enter between the cooling fan 12 and the radiator 13 cannot be secured, the nozzle 21 can be moved along the heat radiating portion 13A of the radiator 13, and the heat radiating portion 13A. The dust 35 adhering to can be easily removed over a wide range.

  Then, after the cleaning operation for the radiator 13 </ b> A of the radiator 13 is completed, the operation tool 34 for raising and lowering the nozzle 21 is placed on the upper surface of the shroud 16 as shown in FIGS. 3 and 4. Accordingly, the nozzle 21 can be placed on the bottom plate 30 of the nozzle guide member 27 and stored in the nozzle storage portion 16 </ b> C of the shroud 16.

  For this reason, when the engine 9 is operated, the cooling air sucked into the building cover 8 by the rotation of the cooling fan 12 is stored in the nozzle storage portion 16C as indicated by an arrow A in FIG. It passes over the nozzle 21. Accordingly, the flow of the cooling air can be prevented from being obstructed by the nozzle 21, and a large amount of cooling air passes through the heat radiating portion 15 </ b> A of the oil cooler 15 and the heat radiating portion 13 </ b> A of the radiator 13. Heat exchange can be promoted.

  Thus, according to the present embodiment, the nozzle 21 is disposed in the shroud 16 provided between the cooling fan 12 and the radiator 13 so as to be movable up and down, and each injection hole 23 provided in the nozzle 21 is provided. The compressed air is jetted from the radiator 13 toward the radiator 13A of the radiator 13. Accordingly, the nozzle 21 is moved along the heat dissipating part 13A of the radiator 13 and the heat dissipating part 15A of the oil cooler 15, and the compressed air from the nozzle 21 is intensively injected onto the dust 35 attached to the heat dissipating parts 13A and 15A. Thus, the dust 35 can be reliably removed.

  Moreover, since the nozzle guide member 27 is provided in the shroud 16 to guide the nozzle 21 upward and downward along the heat radiating portion 13A of the radiator 13, the distance between the nozzle 21 moving up and down and the heat radiating portion 13A of the radiator 13 is provided. Can always be kept substantially constant, and the dust 35 adhering to the heat radiating portion 13A can be reliably removed by the compressed air ejected from the nozzle 21.

  Since the nozzle raising / lowering mechanism 31 is provided in the shroud 16, the operator moves the operation tool 34 of the nozzle raising / lowering mechanism 31 upward and downward, so that the nozzle 21 is moved from the outside of the shroud 16 to the radiator. It can be moved up and down along 13 heat dissipating parts 13A. As a result, even when a clearance sufficient for an operator's hand to enter between the cooling fan 12 and the radiator 13 cannot be secured, the nozzle 21 can be moved up and down along the heat radiating portion 13A of the radiator 13, and the heat radiating portion 13A. The dust 35 adhering to can be easily removed over a wide range.

  Furthermore, when the cooling air from the cooling fan 12 passes through the heat radiating portion 15A of the oil cooler 15 and the heat radiating portion 13A of the radiator 13, the nozzle 21 is stored in the nozzle storage portion 16C provided in the shroud 16. The flow of the cooling air can be prevented from being obstructed by the nozzle 21, and heat exchange in the heat radiating portion 15 </ b> A of the oil cooler 15 and the heat radiating portion 13 </ b> A of the radiator 13 can be promoted.

  In addition, in embodiment mentioned above, the case where the nozzle 21 raises / lowers upward / downward along the thermal radiation part 13A of the radiator 13 is illustrated. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 8, the nozzle 21 ′ is disposed so as to extend upward and downward in the shroud 16, and the nozzle protruding outside the shroud 16. It is good also as a structure which moves this nozzle 21 'to the front and back direction (arrow C direction) along the thermal radiation part 13A of the radiator 13, when an operator hold | grips the upper end part of 21'.

  Moreover, in embodiment mentioned above, the case where the radiator 13 and the oil cooler 15 are provided as a heat exchanger is illustrated. However, the present invention is not limited to this. For example, a condenser for cooling the refrigerant (cooled fluid) of the air conditioner, and the compressed air (cooled fluid) compressed by the turbocharger are cooled. The intercooler or the like may be used as a heat exchanger.

  Moreover, in embodiment mentioned above, the case where the nozzle 21 which can be moved up / down along the heat radiating part 13A of the radiator 13 is illustrated. However, the present invention is not limited to this, and for example, a configuration using a nozzle that is rotatable along the heat dissipating portion 13A may be used.

  Moreover, in embodiment mentioned above, the case where many injection holes 23 are arranged in the length direction in the cylindrical body 22 which comprises the nozzle 21 is illustrated. However, the present invention is not limited to this. For example, a single slit that extends linearly in the length direction of the cylindrical body 22 may be provided.

  Moreover, in embodiment mentioned above, the case where compressed air is used as the fluid for cleaning injected from the nozzle 21 is illustrated. However, the present invention is not limited to this, and may be configured to use, for example, washing water pumped from a pump.

  In the above-described embodiment, the case where the cooling fan 12 driven by the engine 9 is used is illustrated. However, the present invention is not limited to this, and for example, an electric cooling fan may be used.

  Moreover, although the case where the suction-type cooling fan 12 was used was illustrated in the above-described embodiment, the present invention is not limited thereto, and for example, a discharge-type cooling fan may be used.

  Furthermore, in the above-described embodiment, a hydraulic excavator is exemplified as a construction machine on which the heat exchange device is mounted. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a hydraulic crane and a wheel loader.

1 is a front view showing a hydraulic excavator to which an embodiment of a heat exchange device according to the present invention is applied. It is sectional drawing seen from the arrow II-II direction in FIG. 1 which shows an engine, a cooling fan, a heat exchanger, etc. FIG. 3 is an enlarged view of a main part of a partly broken view showing main parts of a cooling fan, a radiator, a shroud, a nozzle and the like in FIG. 2. It is sectional drawing seen from the arrow IV-IV direction in FIG. 3 which shows a radiator, a shroud, a nozzle, a nozzle raising / lowering mechanism, etc. It is a disassembled perspective view which shows a radiator, a shroud, a nozzle, a nozzle raising / lowering mechanism, etc. FIG. 4 is an enlarged view of a main part similar to FIG. 3 showing a cooling fan, a radiator, a shroud, a nozzle, and the like in a state where the nozzle has moved upward. It is sectional drawing seen from the arrow VII-VII direction in FIG. 6 which shows a radiator, a shroud, a nozzle, a nozzle raising / lowering mechanism, etc. in the state which the nozzle moved upwards. It is a perspective view which shows the modification of a nozzle.

Explanation of symbols

12 Cooling fan 13 Radiator (Heat exchanger)
13A, 15A Radiator 15 Oil cooler (heat exchanger)
16 Shroud 16C Nozzle storage part 21, 21 'Nozzle (cleaning means)
22 cylindrical body 23 injection hole 31 nozzle lifting mechanism 32 first rope 33 second rope 34 operation tool

Claims (5)

A cooling fan that generates cooling air, a heat exchanger that faces the cooling fan and exchanges heat of the fluid to be cooled when the cooling air passes through the heat radiating portion, and the cooling air that is the heat exchanger In the heat exchanging device comprising a cleaning means for cleaning dust adhering to the heat radiating part while passing through the heat radiating part,
The cleaning means is configured to be movable along the heat radiating portion of the heat exchanger, and is configured by a nozzle that injects a cleaning fluid toward the heat radiating portion in a direction opposite to the flow direction of the cooling air. A heat exchange device characterized by that.   The nozzle is provided between a heat radiating portion of the heat exchanger and the cooling fan, and a cylindrical body to which the cleaning fluid is supplied is provided in the length direction of the cylindrical body. The heat exchange device according to claim 1, wherein the heat exchange device is configured by an injection hole that injects the cleaning fluid toward the heat radiating portion.   A shroud is provided between the cooling fan and the heat exchanger to guide the cooling air from the cooling fan to the heat radiating portion of the heat exchanger, and the nozzle is radiated from the heat exchanger in the shroud. The heat exchange device according to claim 1, wherein the heat exchange device is configured to be movable up and down along a portion.   The heat exchanging apparatus according to claim 3, wherein a nozzle raising / lowering mechanism is provided in the shroud to raise and lower the nozzle from the outside of the shroud along a heat radiating portion of the heat exchanger.   4. The shroud is provided with a nozzle storage portion that stores the nozzle at a position that does not obstruct the flow of the cooling air when the cooling air from the cooling fan passes through the heat radiating portion of the heat exchanger. Or the heat exchange apparatus of 4.

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