Work machine

Abstract

To provide a working machine capable of improving the efficiency in dust removal with a removal device.SOLUTION: The working machine includes: a main body; a piece of working equipment attached to the main body; a cooling fan that is accommodated inside an engine room provided to the main body for directing cooling air; and a heat exchanger that is placed upstream of the cooling fan with respect to the cooling air flow for exchanging heat with cooling air. The working machine also includes: a first removal unit located upstream of the heat exchanger with respect to the cooling air flow, changes the cooling air flow to a swirling flow to remove dust included in the swirling flow with the centrifugal force, guides the cooling air to the heat exchanger, and discharge the cooling air containing dust; a storage case that stores the first removal unit and forms a discharge space into which the cooling air is discharged from the first removal unit; and a fan for making the discharge space of the storage case negative pressure for amplifying the swirling flow.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a work machine equipped with a removal device for removing dust from cooling air guided to a heat exchanger by a cooling fan.

Background Art

[0002] Work machines such as hydraulic excavators are used in environments where dust is generated. Therefore, the cooling air taken into the engine room contains dust. In addition, when the cooling air passes through the heat exchanger, the dust contained in the cooling air may adhere to the heat exchanger, causing clogging of the heat exchanger.

[0003] Therefore, in the construction machine described in Patent Document 1, a removal device is arranged to face the upstream side of the heat exchange device unit with respect to the flow of the cooling air, and the removal device removes the dust contained in the cooling air. The removal device changes the cooling air into a swirling flow and removes the dust contained in the swirling flow by centrifugal force. The cooling air from which the dust has been removed is guided to the heat exchange device unit and passes through the heat exchange device unit.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the removal device described in Patent Document 1 has a large air resistance in the storage case and a configuration in which it is difficult to amplify the swirling flow, so there is a concern about a decrease in the dust removal efficiency. In particular, when the cooling air contains a large amount of dust, clogging of the heat exchanger occurs, so improvement of the dust removal efficiency is an important issue.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to improve the efficiency of dust removal by a removal device. [Means for solving the problem]

[0007] In order to achieve the above object, a representative aspect of the present invention is a vehicle that includes a main body, a working device attached to the main body, and an engine room provided in the main body, each of which is accommodated therein, An engine, driven by the engine and within the engine room A working machine comprising: a cooling fan that guides cooling air; and a heat exchanger that is disposed upstream of the cooling fan with respect to the flow of the cooling air and exchanges heat with the cooling air, the working machine comprising: a first removal device that is disposed upstream of the heat exchanger with respect to the flow of the cooling air, changes the flow of the cooling air into a swirling flow, removes dust contained in the swirling flow by centrifugal force, and then guides the cooling air to the heat exchanger and discharges the cooling air containing dust; a storage case that houses the first removal device and forms a discharge space through which the cooling air is discharged from the first removal device; When the engine is driven and the cooling fan rotates, it is driven, and when dust in the cooling air is discharged into the discharge space of the storage case by the first removing device The discharge space of the storage case is made negative pressure. , generated inside the first removing device and a fan for amplifying the swirling flow. Effect of the Invention

[0008] According to the present invention, it is possible to improve the efficiency of dust removal by the removal device (first removal device). Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

Figure 7

Figure 8

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Figure 10

Figure 11

Mode for Carrying Out the Invention

[0010] (First Embodiment) An embodiment of the working machine according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator 1 which is a representative example of the working machine according to the present invention. In addition, the front, rear, left, and right in this specification are based on the viewpoint of an operator who rides on and operates the hydraulic excavator 1 unless otherwise specified.

[0011] The hydraulic excavator 1 includes a lower traveling body 2, an upper swing body 3 supported by the lower traveling body 2, and a working device 4 attached to the upper swing body 3. The lower traveling body 2 and the upper swing body 3 are an example of the main body of the hydraulic excavator 1. The lower traveling body 2 includes a pair of left and right endless tracks 8. When the rotation of a traveling motor (not shown) is transmitted to the pair of left and right endless tracks 8 and the endless tracks 8 rotate, the hydraulic excavator 1 travels. However, the lower traveling body 2 may be wheel-mounted instead of the endless tracks 8.

[0012] The upper slewing body 3 is supported by the lower traveling body 2 in a slewing - capable state by a slewing motor (not shown). The upper slewing body 3 mainly includes a slewing frame 5 as a base, a cab 7 arranged on the front - left side of the slewing frame 5, a counterweight 6 arranged at the rear of the slewing frame 5, and an engine room (shed) 10. The working device 4 is a front - working machine for performing earth - and - sand excavation work, etc., and is attached to the front center of the slewing frame 5 so as to be rotatable in the vertical direction.

[0013] The working device 4 includes a boom 4a supported by the upper slewing body 3 so as to be able to rise and fall, an arm 4b swingably supported at the tip of the boom 4a, a bucket 4c swingably supported at the tip of the arm 4b, and hydraulic cylinders 4d - 4f for driving the boom 4a, the arm 4b, and the bucket 4c. The counterweight 6 is a heavy object for taking the weight balance with the working device 4 and is supported by the slewing frame 5 at the rear end of the upper slewing body 3.

[0014] The cab 7 has an internal space where an operator who operates the hydraulic excavator 1 rides. Inside the cab 7, a seat (not shown) on which the operator sits and an operating device (such as a steering wheel, pedals, levers, switches, etc.) operated by the operator sitting on the seat are arranged. By the operator in the cab 7 operating the operating device, the lower traveling body 2 travels, the upper slewing body 3 slews, and the working device 4 operates.

[0015] The engine room 10 is provided between the cab 7 and the counterweight 6 of the upper slewing body 3, is supported by the slewing frame 5 behind the working device 4 and the cab 7 and in front of the counterweight 6. Also, the engine room 10 extends over the entire left - right direction of the slewing frame 5. The upper part of the engine room 10 is covered by an engine cover 12, and the first removing device 30 described later is exposed on the left side part.

[0016] Figure 2 is a cross-sectional view of the engine room 10 shown in Figure 1 as seen from the rear. Inside the engine room 10, a hydraulic pump 20, an engine 21, a cooling fan 22, a heat exchanger 23, and a storage case 24 are accommodated in order from the right side to the left side. The engine 21 is a drive source of the hydraulic excavator 1 and generates a driving force for operating the hydraulic excavator 1. The hydraulic pump 20 is driven by the engine 21 and supplies the hydraulic oil stored in a hydraulic oil tank (not shown) to a travel motor, a swing motor, and hydraulic cylinders 4d to 4f.

[0017] Inside the engine 21, a coolant passage through which a coolant (for example, water, oil) passes is formed. The coolant is supplied from the heat exchanger 23, cools the engine 21 by passing through the coolant passage, and then returns to the heat exchanger 23 again. The heat exchanger 23 includes a radiator (not shown) that cools the coolant flowing back from the engine 21, and supplies the coolant cooled by the radiator to the engine 21 again. Note that the heat exchanger 23 may include heat exchangers other than the radiator, for example, an oil cooler that cools the hydraulic oil, and an intercooler that cools the intake air of the turbocharged engine 21.

[0018] The cooling fan 22 is attached to the drive shaft of the engine 21 via a pulley and a belt, and rotates by the driving force transmitted from the engine 21. As the cooling fan 22 rotates, a flow of cooling air is induced inside the engine room 10. Thereby, the cooling fan 22 generates a flow of cooling air for cooling the engine 21 and the heat exchanger 23. The storage case 24, the heat exchanger 23, the cooling fan 22, and the engine 21 are arranged in order from the upstream side to the downstream side of the flow of cooling air by the cooling fan 22. The engine 21 is arranged on the downstream side of the cooling fan 22 with respect to the flow of cooling air, and is cooled by the cooling air generated by the cooling fan 22.

[0019] The heat exchanger 23 is disposed upstream of the cooling fan 22 with respect to the flow of the cooling air and faces the cooling fan 22. The cooling fan 22 generates a negative pressure between the heat exchanger 23 and the cooling fan 22 to guide the cooling air to the heat exchanger 23. As the cooling fan 22 rotates, the air (outside air) outside the engine room 10 is taken into the engine room 10 from the air intake port 13 as cooling air and passes through the heat exchanger 23. The heat exchanger 23 exchanges heat with the cooling air guided by the cooling fan 22.

[0020] A storage case 24 is disposed opposite the heat exchanger 23 at a position upstream of the heat exchanger 23 with respect to the flow of the cooling air guided to the heat exchanger 23. The storage case 24 is formed in a rectangular parallelepiped shape and is attached to the upper swivel body 3. The heat exchanger 23 and the storage case 24 are disposed at an interval, forming a ventilation space 25 through which the cooling air flows between them. The storage case 24 faces the upstream side surface 23a of the heat exchanger 23 that is located on the upstream side of the flow of the cooling air in the heat exchanger 23 with the ventilation space 25 interposed therebetween.

[0021] FIG. 3 is a perspective view of the upper swivel body 3 shown in FIG. 1 as viewed from the rear. In FIG. 3, a part of the upper swivel body 3 is omitted. A plurality of first removing devices 30 are stored inside the storage case 24. The storage case 24 and the first removing devices 30 are provided so as to be exposed on the side portion of the engine room 10. A plurality (for example, five) of exhaust fans 70 are provided on the lower surface of the storage case 24. The plurality of first removing devices 30 are provided at intervals in the vertical and horizontal directions and are disposed upstream of the heat exchanger 23 with respect to the flow of the cooling air by the cooling fan 22. The first removing device 30 changes the flow of the cooling air into a swirling flow and removes the dust contained in the swirling flow by centrifugal force.

[0022] Referring to FIG. 2, the cooling air passes through the first removal device 30, the ventilation space 25, the heat exchanger 23, the cooling fan 22, and the engine 21 in sequence inside the engine room 10. The first removal device 30 is arranged opposite to the heat exchanger 23 to remove dust contained in the cooling air led to the heat exchanger 23. The ventilation space 25 is located between the first removal device 30 and the heat exchanger 23, and the cooling air led from the first removal device 30 to the heat exchanger 23 flows through it.

[0023] FIG. 4 is a perspective view of the cut first removal device 30. FIG. 5 is a side view of the cut first removal device 30. The first removal device 30 is attached to the upstream side wall 24a located on the upstream side of the flow of the cooling air and the downstream side wall 24b located on the downstream side of the flow of the cooling air in the storage case 24, and is stored in the discharge space 24c formed inside the storage case 24. The discharge space 24c is a space located outside the first removal device 30 in the internal space of the storage case 24. The first removal device 30 discharges dust into the discharge space 24c.

[0024] The first removal device 30 is made of, for example, synthetic resin and has a cylindrical first cylinder body 31 and a second cylinder body 40. The first cylinder body 31 has an upstream side opening 32 located at one end on the upstream side of the flow of the cooling air, a downstream side opening 33 located at the other end on the downstream side of the flow of the cooling air, and a cavity 34 extending from the upstream side opening 32 to the downstream side opening 33. The upstream side opening 32 of the first cylinder body 31 is arranged in the upstream side hole 24d formed in the upstream side wall 24a of the storage case 24 and is fixedly attached to the upstream side hole 24d without a gap due to deformation by heating. The downstream side opening 33 of the first cylinder body 31 is arranged in the discharge space 24c.

[0025] The first removing device 30 includes a spiral blade 35 fixed to the inner peripheral surface of the first cylindrical body 31, a shaft portion 36 that supports the blade 35, and a connecting portion 37 that connects the shaft portion 36 to the inner peripheral surface of the first cylindrical body 31. The blade 35 is provided at a position on the upstream opening 32 side within the cavity 34 of the first cylindrical body 31, and changes the flow of the cooling air guided to the first removing device 30 into a swirling flow. As a result, the cooling air swirls within the cavity 34 and is blown against the inner peripheral surface of the cavity 34.

[0026] The second cylindrical body 40 includes an upstream opening 41 located at one end on the upstream side of the flow of the cooling air, a downstream opening 42 located at the other end on the downstream side of the flow of the cooling air, a cavity 43 extending from the upstream opening 41 to the downstream opening 42, and an annular reinforcing portion 44 provided on the outer peripheral surface of the upstream opening 41. The downstream opening 42 of the second cylindrical body 40 is disposed within a downstream hole portion 24e formed in the downstream side wall 24b of the storage case 24, and is fixed to the downstream hole portion 24e without a gap due to deformation by heating.

[0027] The outer diameter of the upstream opening 41 of the second cylindrical body 40 is smaller than the outer diameter of the downstream opening 42 and the inner diameter of the downstream opening 33 of the first cylindrical body 31. The upstream opening 41 of the second cylindrical body 40 is located within the cavity 34 of the first cylindrical body 31 and is disposed upstream of the downstream opening 33 of the first cylindrical body 31 in the flow of the cooling air. A gap 38 through which dust can be discharged is formed between the outer peripheral surface of the second cylindrical body 40 and the inner peripheral surface of the first cylindrical body 31 at a location between the upstream opening 41 of the second cylindrical body 40 and the downstream opening 33 of the first cylindrical body 31.

[0028] The cooling air is guided to the first dust removal device 30 and flows into the upstream opening 32 of the first cylinder 31. Inside the first cylinder 31, the flow of the cooling air is changed into a swirling flow by the blades 35 and flows through the cavity 34. The dust contained in the cooling air is blown towards the inner peripheral surface of the first cylinder 31 under the centrifugal force of the swirling flow, separated from the cooling air by the centrifugal force, and removed. The clean cooling air from which the dust has been removed flows out from the downstream opening 42 through the cavity 43 from the upstream opening 41 of the second cylinder 40. In this way, after removing the dust, the first dust removal device 30 allows the cooling air to flow out to the ventilation space 25 and guides the dust-removed cooling air to the heat exchanger 23.

[0029] The dust separated from the cooling air flows along the inner peripheral surface of the first cylinder 31 and is discharged together with the cooling air from the gap 38 between the first cylinder 31 and the second cylinder 40 towards the outside of the first dust removal device 30. The first dust removal device 30 discharges the cooling air containing dust into the discharge space 24c of the storage case 24.

[0030] Here, in the first embodiment, as shown in FIGS. 2 and 3, a plurality of exhaust fans 70 are provided on the lower surface of the storage case 24. By driving these exhaust fans 70, the cooling air containing dust is discharged to the atmosphere through the exhaust fans 70. FIG. 6 is a diagram showing the flow of the cooling air in the engine room 10.

[0031] As shown in FIG. 6, when the engine 21 is driven and the cooling fan 22 rotates, the cooling air is taken into the first dust removal device 30, and the dust is removed by the first dust removal device 30. Then, the dust-removed cooling air flows along the axial direction of the cooling fan 22 in the direction of arrow A in the figure and cools the heat exchanger 23 and the engine 21. On the other hand, the dust removed by the first dust removal device 30 is discharged in the flow direction of the swirling flow in the discharge space 24c. Then, the air containing dust in the discharge space 24c is sucked by the exhaust fan 70 and discharged in the direction of arrow B in the figure. In this way, the dust in the discharge space 24c of the storage case 24 is discharged into the atmosphere. Note that the reference numeral 23a in FIG. 6 is an insect-proof net.

[0032] According to the first embodiment, for example, the following operational effects can be achieved.

[0033] Since the heat exchanger 23 can be cooled by the cooling air from which dust has been removed by the first dust removing device 30, clogging of the heat exchanger 23 can be prevented. Moreover, the exhaust fan 70 causes the discharge space 24c of the storage case 24 to be in a negative pressure state, and the cooling air taken into the first dust removing device 30 is drawn toward the discharge space 24c due to the pressure difference. As a result, the swirling flow generated inside the first dust removing device 30 can be amplified, and the centrifugal force acting on the dust contained in the swirling flow can be increased. Consequently, the dust removal efficiency of the first dust removing device 30 is improved, and clogging of the heat exchanger 23 can be further prevented. That is, with a simple configuration that only requires the exhaust fan 70, the dust removal efficiency of the first dust removing device 30 can be significantly improved.

[0034] Also, since the exhaust fan 70 is provided on the lower surface of the storage case 24, dust is discharged downward. Therefore, there is also an advantage that dust can be prevented from scattering into the atmosphere around the hydraulic excavator 1, and the working environment can be kept good.

[0035] Of course, the mounting position of the exhaust fan 70 is not limited to the lower surface of the storage case 24. It may be provided on the upper part or the left and right side parts of the storage case 24. In any case, when the exhaust fan 70 is driven, the discharge space 24c becomes a negative pressure state, the swirling flow generated inside the first dust removing device 30 can be amplified, and the centrifugal force acting on the dust contained in the swirling flow can be increased. As a result, the dust removal efficiency of the first dust removing device 30 can be enhanced.

[0036] (Second Embodiment) Next, a second embodiment of the present invention will be described. Regarding the configuration that overlaps with the above-described first embodiment, the same reference numerals will be given and the description will be omitted. FIG. 7 is a side view of the hydraulic excavator 101 according to the second embodiment, FIG. 8 is a cross-sectional view of the engine room 10 shown in FIG. 7 as viewed from the rear, and FIG. 9 is a perspective view of the upper swing body 3 shown in FIG. 7 as viewed from the rear. In FIG. 9, a part of the upper swing body 3 is not shown.

[0037] As shown in FIGS. 7 to 9, the second embodiment is characterized in that it further includes a second dust removing device 50 for removing dust. Also, in the second embodiment, it is different from the first embodiment in that a blower fan 71 is provided instead of providing a plurality of exhaust fans 70 on the lower surface of the storage case 24. The cooling air containing dust discharged from the first dust removing device 30 is taken in by the second dust removing device 50 shown in FIGS. 7 to 9. FIG. 10 is a cross-sectional view showing an enlarged portion of the second dust removing device 50. FIG. 11 is a diagram showing the flow of the cooling air in the engine room 10.

[0038] The second dust removing device 50 sucks the cooling air discharged from the first dust removing device 30 by the blower fan 71 and blows it toward the heat exchanger 23. The second dust removing device 50 also has a separating device 51 for separating dust from the cooling air. The separating device 51 takes in the cooling air discharged from the first dust removing device 30 and separates and removes the dust from the cooling air blown toward the heat exchanger 23. The separating device 51 is a centrifugal type air cleaner that uses centrifugal force to separate dust and is attached to the upper part of the storage case 24. The separating device 51 has a cylindrical separating case 52 and blades 53 that rotate within the separating case 52. An annular suction port 54 and a discharge port 55 are formed concentrically on the bottom surface of the separating case 52. The discharge port 55 is formed on the center side in the radial direction of the separating case 52, and the suction port 54 is formed surrounding the discharge port 55. The blades 53 are attached to a rotation axis passing through the center of the concentric circles formed by the suction port 54 and the discharge port 55.

[0039] A first air passage 56 is connected to the suction port 54, and a second air passage 60 is connected to the discharge port 55. The second dust removing device 50 communicates with the discharge space 24c through the first air passage 56 that leads to the discharge space 24c of the storage case 24. The first air passage 56 extends vertically from the discharge space 24c to the suction port 54 of the separating device 51. The second air passage 60 is, for example, a duct and extends from the discharge port 55 of the separating device 51 toward the heat exchanger 23.

[0040] At the tip of the second air passage 60, a blower fan (fan) 71 arranged toward the heat exchanger 23 is attached. When the blower fan 71 is driven, a flow of cooling air toward the heat exchanger 23 is generated inside the second removing device 50, and a flow of cooling air toward the second removing device 50 is generated in the discharge space 24c of the storage case 24. Thereby, the cooling air in the discharge space 24c is guided (suctioned) from the first removing device 30 to the second removing device 50 and recovered by the second removing device 50. In other words, the blower fan 71 sucks the cooling air in the discharge space 24c and discharges it toward the heat exchanger 23 via the second removing device 50.

[0041] The second removing device 50 takes in (see arrow D in FIG. 11) the cooling air containing dust discharged from the first removing device 30 from the discharge space 24c into the separating device 51 via the first air passage 56. The taken-in cooling air is sucked from the suction port 54 into the inside of the separation case 52, and a swirling flow is generated inside the separation case 52. The blades 53 rotate by the swirling flow and remove the dust contained in the swirling flow of the cooling air by centrifugal force.

[0042] The dust contained in the cooling air is blown toward the inner peripheral surface of the separation case 52 by the centrifugal force of the swirling flow and pressed against the slit 52a formed in the separation case 52 by the rotating blades 53. Thereby, the dust is pushed out from the slit 52a, separated from the cooling air, and removed. The removed dust is discharged into the atmosphere outside the second removing device 50 (see arrow E in FIG. 11). The cooling air from which the dust has been removed is discharged from the discharge port 55 of the separation case 52 into the second air passage 60 and flows out toward the ventilation space 25 through the second air passage 60 (see arrow F in FIG. 11).

[0043] After the second dust removal device 50 removes the dust contained in the cooling air by the separation device 51, the clean cooling air from which the dust has been removed is caused to flow toward the heat exchanger 23 by the blower fan 71. The blower fan 71 is disposed in the ventilation space 25 and blows the cooling air toward the heat exchanger 23. By the blower fan 71, the cooling air is guided to the heat exchanger 23 and supplied from the second dust removal device 50 toward the heat exchanger 23. Thus, the cooling air from which the dust has been removed is guided to the heat exchanger 23 by the second dust removal device 50 (see arrow F in FIG. 11) and merges with the cooling air (see arrow C in FIG. 11) guided from the first dust removal device 30 to the heat exchanger 23 in the ventilation space 25.

[0044] The separation device 51, the first air passage 56, and the second air passage 60 of the second dust removal device 50 are located above the first dust removal device 30 and are disposed outside the ventilation space 25. The second air passage 60 extends from outside the ventilation space 25 toward the ventilation space 25 and opens at a location on the upstream side of the flow of the cooling air in the ventilation space 25. Further, the second air passage 60 extends from the separation device 51 above the first dust removal device 30 toward the ventilation space 25 and the heat exchanger 23. The cooling air flowing from the separation device 51 toward the heat exchanger 23 flows through the second air passage 60 and is sent out from the outlet 61 of the second air passage 60 toward the heat exchanger 23. The blower fan 71 is connected to the outlet 61 and blows the cooling air sent out from the outlet 61 toward the heat exchanger 23.

[0045] The outlet 61 is formed at the tip of the second air passage 60 and is disposed toward the upstream side surface 23a of the heat exchanger 23. The upstream side surface 23a is the surface of the heat exchanger 23 on the side of the first dust removal device 30 and is disposed to face the first dust removal device 30. The cooling air is sent out from the outlet 61 to the ventilation space 25 via the blower fan 71 and is supplied obliquely to the upstream side surface 23a. That is, the cooling air is sent out from the outlet 61 in a direction inclined obliquely with respect to the upstream side surface 23a so as to hit the upstream side surface 23a from obliquely above and is supplied to the upstream side surface 23a.

[0046] The second air passage 60 has straight portions 62, 63 and a bent portion 64 between the upstream end and the downstream end of the flow of the cooling air. The straight portions 62, 63 extend straight from the upstream side to the downstream side of the flow of the cooling air inside the second air passage 60. Of the straight portions 62, 63, one straight portion 62 is an upstream straight portion including the upstream end of the second air passage 60 located on the upstream side of the flow of the cooling air, and the other straight portion 63 is a downstream straight portion including the downstream end of the second air passage 60 located on the downstream side of the flow of the cooling air and the air outlet 61.

[0047] The bent portion 64 is located between the two straight portions 62, 63 and connects the straight portions 62, 63. The second air passage 60 bends toward the heat exchanger 23 at an obtuse angle only at one bent portion 64. When comparing the lengths along the flow of the cooling air, the total length of the respective lengths of the straight portions 62, 63 is longer than the length of the bent portion 64. Thus, over the entire length of the second air passage 60, the lengths of the straight portions 62, 63 are longer than the lengths of the portions other than the straight portions 62, 63.

[0048] According to the second embodiment, for example, the following operational effects are achieved.

[0049] The cooling air discharged from the first removing device 30 can be taken into the second removing device 50 by the blower fan 71 and supplied toward the heat exchanger 23. Therefore, the air volume of the cooling air supplied to the heat exchanger 23 can be ensured. By blowing the cooling air by the blower fan 71, the internal space of the second removing device 50 and the discharge space 24c of the storage case 24 become negative pressure, and the cooling air inside the first removing device 30 is drawn toward the discharge space 24c. Thereby, the swirling flow generated inside the first removing device 30 can be amplified, and the centrifugal force acting on the dust contained in the swirling flow can be increased. As a result, the first removing device 30 can efficiently remove the dust contained in the cooling air and prevent the heat exchanger 23 from being clogged by the dust contained in the cooling air.

[0050] The dust separation device 51 can separate and remove dust from the cooling air before it is blown toward the heat exchanger 23. As a result, the cooling air from which the dust has been removed can be supplied to the heat exchanger 23, thereby preventing the heat exchanger 23 from being clogged with dust.

[0051] The second removal device 50 is installed above the storage case 24, and the second removal device 50 can be communicated with the discharge space 24c in the storage case 24 without increasing the distance between the discharge space 24c in the storage case 24 and the second removal device 50. Therefore, the pressure loss of the cooling air flowing from the first removal device 30 toward the second removal device 50 can be suppressed, and the cooling air can be efficiently taken in from the discharge space 24c into the second removal device 50.

[0052] The second air passage 60 extends from the outside of the ventilation space 25 toward the ventilation space 25 and does not impede the flow of the cooling air in the ventilation space 25. Further, the cooling air is obliquely supplied from the air outlet 61 of the second air passage 60 to the upstream side surface 23a of the heat exchanger 23. Therefore, the cooling air can be made to flow toward the heat exchanger 23 without significantly bending the second air passage 60. Accordingly, an increase in the resistance acting on the cooling air flowing through the second air passage 60 is suppressed. As a result, the pressure loss of the cooling air can be reduced, and the cooling air can be smoothly made to flow toward the heat exchanger 23.

[0053] In the straight portions 62 and 63 of the second air passage 60, the resistance acting on the cooling air is smaller than that in the bent portion 64, and the pressure loss of the cooling air is reduced, so that the cooling air flows smoothly. Therefore, the pressure loss of the cooling air can be reduced, and the cooling air can be efficiently supplied to the heat exchanger 23.

[0054] To confirm the effects of this embodiment, an anemometer was attached to the upstream side surface 23a of the heat exchanger 23, and the wind speed was measured by the anemometer at a plurality of measurement locations on the heat exchanger 23. When the cooling fan 22 was driven with the blower fan 71 stopped, cooling air was supplied at each of the plurality of measurement locations according to the wind speed measurement results. Also, when the blower fan 71 was driven with the cooling fan 22 stopped, cooling air was supplied at each of the plurality of measurement locations according to the wind speed measurement results. From this, it was found that the first removing device 30 can guide the cooling air to the heat exchanger 23 and the second removing device 50 can supply the cooling air to the heat exchanger 23.

[0055] Note that a rectifying plate facing the blower fan 71 may be provided inside the ventilation space 25, and the rectifying plate may rectify the cooling air flowing from the second removing device 50 toward the heat exchanger 23. Thereby, the cooling air sent out from the air outlet 61 of the second air passage 60 may be supplied obliquely to the upstream side surface 23a of the heat exchanger 23. Also, the first removing device 30 is not limited to a synthetic resin, and for example, it may be made of a metal such as a steel material and attached to the storage case 24 with bolts and nuts. The storage case 24 may be formed in a shape other than a rectangular parallelepiped shape.

[0056] The second removing device 50 is not limited to being provided at the upper part of the storage case 24, and for example, it may be installed at the lower part or the side part of the storage case 24. Also, the position of the blower fan 71 is not limited to the upper part of the storage case 24. As long as it can suck the inside of the discharge space 24c of the storage case 21 to create a negative pressure and take in the cooling air discharged into the discharge space 24 to supply it to the heat exchanger 23, the blower fan 71 may be provided at any position.

[0057] Further, the cooling fan 22 is not limited to a fan driven by the engine 21, and may be, for example, an electric drive fan or a hydraulic drive fan. Also, two or more cooling fans 22 may be provided inside the engine room 10. The exhaust fan 70 and the blower fan 71 may be driven, for example, electrically, hydraulically, or by the engine 21.

[0058] In this embodiment, the case where the present invention is applied to the hydraulic excavators 1 and 101 has been described as an example. However, the present invention is applicable to other types of working machines including, for example, wheel loaders and dump trucks, and exhibits the same effects. Thus, the present invention can be applied to various working machines that cool a heat exchanger with cooling air.

[0059] The above-described embodiments are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention.

Explanation of Reference Numerals

[0060] 1 Hydraulic excavator 2 Lower traveling body (main body) 3 Upper slewing body (main body) 4 Working device 10 Engine room 20 Hydraulic pump 21 Engine 22 Cooling fan 23 Heat exchanger 23a Upstream side surface 24 Storage case 24c Discharge space 25 Ventilation space 30 First removal device 50 Second removal device 51 Separation device 56 First air passage 60 Second air passage 61 Outlet 62 Straight portion 63 Straight portion 64 Flexure part 70 Exhaust fan (fan) 71 Blower fan (fan) 101 Hydraulic excavator

Claims

1. A main body, A working device attached to the main body, An engine, a cooling fan driven by the engine to introduce cooling air into the engine room, and a heat exchanger arranged upstream of the cooling fan with respect to the flow of the cooling air and performing heat exchange with the cooling air, each housed inside an engine room provided in the main body, and a working machine comprising: A first removing device arranged upstream of the heat exchanger with respect to the flow of the cooling air, changing the flow of the cooling air into a swirling flow, removing dust contained in the swirling flow by centrifugal force, then guiding the cooling air to the heat exchanger, and discharging the cooling air containing dust; A storage case that houses the first removing device and forms a discharge space from which the cooling air is discharged from the first removing device; A working machine, characterized in that it includes a fan that is driven when the engine is driven and the cooling fan rotates, and creates a negative pressure in the discharge space of the storage case when dust in the cooling air is discharged into the discharge space of the storage case by the first removing device, so as to amplify the swirling flow generated inside the first removing device.

2. In the working machine according to Claim 1, The fan is provided on the lower surface of the storage case, The dust removed by the first removing device is discharged from the storage case to the atmosphere through the fan. A working machine characterized by this.

3. A main body, A working device attached to the main body, A cooling fan for introducing cooling air, and a heat exchanger arranged upstream of the cooling fan with respect to the flow of the cooling air and performing heat exchange with the cooling air, each housed inside an engine room provided in the main body, and a working machine comprising: A first removing device arranged upstream of the heat exchanger with respect to the flow of the cooling air, changing the flow of the cooling air into a swirling flow, removing dust contained in the swirling flow by centrifugal force, then guiding the cooling air to the heat exchanger, and discharging the cooling air containing dust; A storage case that houses the first removing device and forms a discharge space from which the cooling air is discharged from the first removing device; A fan for creating a negative pressure in the discharge space of the storage case to amplify the swirling flow; And a second removing device having a separating device that takes in the cooling air discharged from the first removing device and separates dust from the cooling air. The second dust removal device is a working machine characterized in that the cooling air from which dust has been separated by the separation device is blown by the fan toward the heat exchanger.

4. In the working machine according to claim 3, the second dust removal device is installed above the storage case and communicates with the discharge space, which is a feature of the working machine.

5. In the working machine according to claim 4, it is located between the first dust removal device and the heat exchanger and has a ventilation space through which the cooling air flows. The second dust removal device connects the discharge space and the ventilation space via the second dust removal device and has an air passage through which the cooling air flows from the discharge space toward the heat exchanger. The air passage has an outlet that sends out the cooling air supplied obliquely to the surface of the heat exchanger on the side of the first dust removal device into the ventilation space, which is a feature of the working machine.

6. In the working machine according to claim 5, the air passage has a straight portion that extends straight from the upstream side to the downstream side of the flow of the cooling air, which is a feature of the working machine.

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