JP2011006958A - Dust-proof device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust-proof device for a construction machine capable of restraining a dust-proof net from being clogged in an operation site with a large amount of dust.SOLUTION: The dust-proof device includes a first partitioning plate 7 and a second partitioning plate 8, a cooling wind is thereby guided to a cooling fan 3 through a route inverted from a downflow to an up-flow, and almost all portions of the dust are deposited therein in an engine room 1 lower part without being inverted therein by a dead weight to reduce the dust captured by the dust-proof net 6 compared with a prior art. The dust-proof net is thereby restrained from being clogged.

Description

  The present invention relates to a dustproof device for a construction machine such as a hydraulic excavator, and more particularly to a dustproof device for a construction machine provided with a dustproof net that captures dust in cooling air.

  In construction machines such as hydraulic excavators, excavation work is performed by operating actuators that drive booms, arms, and buckets. A hydraulic pump is driven by an engine as a power source, and hydraulic actuators are pumped to a hydraulic cylinder to operate each actuator. When the engine and hydraulic pump are operated, heat is generated in the engine and hydraulic fluid. Therefore, heat exchangers such as radiators and oil coolers are installed for cooling engine coolant and hot hydraulic oil. The cooling air induced by the cooling fan passes through the heat exchanger, whereby the heat exchanger is cooled. A device for cooling the heat exchanger is called a cooling device.

  Furthermore, due to recent regulations on exhaust gas, construction machines equipped with an intercooler are becoming mainstream in order to reduce the concentration of nitrogen oxides in the exhaust gas. The intercooler cools the engine intake air that is turbo-charged and adiabatically compressed to a predetermined temperature, increases the charging efficiency, and lowers the combustion temperature, thereby suppressing the generation of NOx (nitrogen oxides) in the exhaust. . In addition, a condenser for cooling the refrigerant of the air conditioner may be installed.

  Such a construction machine often operates in a space where dust is floating around, such as an industrial waste treatment plant or forestry, and the surrounding dust is sucked together with the cooling air, and the dust accumulates on the heat exchanger. A dustproof net is provided on the upstream side of the cooling air in the heat exchanger so as to face the heat exchanger.

  The dust-proof net captures dust in the cooling air, but if dust accumulates on the dust-proof net and becomes clogged, the amount of cooling air is reduced and the cooling performance of the heat exchanger is reduced. Therefore, it is necessary to frequently clean the dustproof net to remove clogging. In a so-called series arrangement type heat exchanger unit that has been widely employed in the past, it is necessary to provide a dustproof net for each heat exchanger, and it is also necessary to clean the dustproof net individually. Moreover, since the dust-proof net | network provided in the heat exchanger arrange | positioned downstream is difficult to access, cleaning was difficult.

  In order to improve the ease of cleaning of such a dustproof net, the technique described in Patent Document 1 has been proposed. The dustproof device described in Patent Document 1 is provided with a common dustproof net so as to face a parallel heat exchanger unit in which heat exchangers such as a radiator, an oil cooler, and an intercooler are arranged in parallel. Thereby, it is only necessary to clean one dustproof net, and the ease of cleaning can be improved.

JP 2006-52689 A

  As described above, the dustproof device described in Patent Document 1 can improve the ease of cleaning, but does not suppress clogging of the dustproof net itself. Since cleaning of the dustproof net involves attaching and detaching the dustproof net, it is preferable that the frequency of cleaning is low. However, if the clogging of the dust-proof net is left unattended, the cooling air volume decreases and the cooling performance of the heat exchanger decreases, causing various problems. For example, if the cooling performance of the radiator decreases, the engine will overheat.

  Although it is conceivable to cope with the decrease in cooling performance by increasing the capacity of the heat exchanger, it is not realistic because the space for mounting the heat exchanger in the engine room is limited.

  In addition, in the conventional dustproof device, the line connecting the opening for taking in the cooling air and the cooling fan becomes the main path of the cooling air, so that dust concentrates on the main path of the cooling air, and the cooling air path and the dustproof net are There is a problem in that dust is concentrated and captured in the intersecting peripheral area, and clogging is likely to occur.

  An object of the present invention is to provide a dustproof device for a construction machine capable of suppressing clogging of a dustproof net at an operation site where there is a lot of dust.

  (1) In order to achieve the above object, the present invention provides a cooling device that cools a heat exchanger device with cooling air that is induced by a cooling fan and that is taken in from an opening. In a dustproof device for a construction machine provided with a dustproof net that captures dust in cooling air, the first partition plate that is provided facing the opening and induces a downward flow, A second partition plate that is provided on the downstream side of the cooling air of the first partition plate and upstream of the cooling air of the dust-proof net and induces an upward flow that reverses from the downward flow.

  In the present invention configured as described above, the first partition plate induces a downward flow, and the dust is guided downward along with the descending cooling air and is accumulated in the lower part of the engine compartment. The second partition plate induces an upward flow, and the cooling air is reversed from the downward flow to the upward flow, but most of the dust accumulated in the lower part of the engine compartment is not reversed by its own weight, and the accumulated state is maintained. Also, some of the dust contained in the upward flow falls due to gravity and accumulates in the lower part of the engine compartment.

  That is, most of the dust contained in the cooling air accumulates in the lower part of the engine compartment, and less dust is trapped in the dustproof net than in the conventional case. Thereby, clogging of the dustproof net can be suppressed.

  The dust accumulated in the lower part of the engine compartment is blown off by the wind pressure of the compressor and is released from an opening provided on the upstream side of the engine compartment bottom cooling air. As a result, the engine compartment can be easily cleaned.

  As a result of the clogging of the dust-proof net being suppressed, the cleaning effort can be reduced by reducing the frequency of cleaning the dust-proof net. It is possible to prevent the engine from being overheated by reducing the trouble of cleaning the dustproof net and easily cleaning the engine compartment.

  (2) In the above (1), preferably, the dust-proof net is disposed substantially horizontally, one end thereof is held by the first partition plate, and the other end is held by the second partition plate.

  By arranging the dustproof net substantially horizontally in this way, even if dust is captured by the dustproof net, a part of the captured dust falls due to its own weight and accumulates in the lower part of the engine compartment. Thereby, clogging of the dustproof net can be further suppressed.

  (3) In the above (1), preferably, an extension plate is further provided at a lower end portion of the first partition plate so that the first partition plate extends downward.

  If the length of the first partition plate in the downward direction is not sufficiently long, a part of the dust in the downward flow deviates from the downward flow, reaches the dust-proof net from the lower end of the first partition plate, and is captured by the dust-proof net. there is a possibility.

  By providing the extending plate in this way, the dust in the downward flow is surely guided downward along with the descending cooling air without deviating from the downward flow, and is accumulated in the lower part of the engine compartment. Further, by providing the extension plate, the dust colliding with the extension plate is increased, and the dust colliding with the extension plate loses the velocity component in the horizontal direction, falls due to gravity, and accumulates in the lower part of the engine compartment. At this time, since the dust falls to the opening side (cooling air upstream side), it is rarely guided upward with the rising cooling air. As a result, the amount of dust captured by the dustproof net is further reduced. Thereby, clogging of the dustproof net can be further suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, clogging of a dustproof net | network at the operation site with much dust can be suppressed. As a result, the engine can be prevented from overheating.

It is sectional drawing which shows the engine room with which the dustproof apparatus of the construction machine concerning 1st Embodiment of this invention is provided. It is a perspective view of an engine room. It is a top view of an engine room. 1 is an overall view of a hydraulic excavator that is an example of a construction machine to which the present embodiment is applied. It is sectional drawing which shows the engine room provided with the conventional dustproof apparatus for the comparison. It is sectional drawing which shows the engine room with which the dustproof apparatus of the construction machine concerning 2nd Embodiment of this invention is provided. It is sectional drawing which shows the engine room provided with the dustproof apparatus of the construction machine concerning the reference example of this invention.

<First Embodiment>
A first embodiment of the present invention will be described with reference to the drawings.

~Constitution~
FIG. 1 is a cross-sectional view showing an engine room 1 provided with a dustproof device for a construction machine according to a first embodiment of the present invention. FIG. 2 is a perspective view of the engine compartment 1. FIG. 3 is a plan view of the engine compartment 1. The configuration of the first embodiment will be described with reference to FIGS.

  The dustproof device of the present embodiment is provided in the engine compartment 1. The engine compartment 1 is covered with a building cover 28 on the outside, and openings 21 and 22 for taking in cooling air are formed in the building cover 28. A dust-proof net 26 is provided in the opening 21 on the upper surface, and a dust-proof net 27 is provided in the opening 22 on the side surface. In the engine chamber 1, a heat exchanger unit 10, a fuel cooler 14, a condenser 15, a shroud 4 provided on the downstream side of the heat exchanger unit 10, and cooling air for cooling the heat exchanger unit 10 are induced. A cooling fan 3 is provided, and these constitute a cooling device.

  The engine 2 is supported in the engine chamber 1 via an engine mount (not shown). A hydraulic pump (not shown) is attached to a drive shaft on the flywheel side of the engine 2. The cooling fan 3 is attached to a drive shaft opposite to the hydraulic pump, and is driven by the engine 2 to induce cooling air. The heat exchanger unit 10 is arranged so as to face the cooling fan upstream of the cooling fan 3, and includes a radiator 11, an oil cooler 12, and an intercooler 13 arranged in parallel in the cooling air direction. The fuel cooler 14 and the air conditioner condenser 15 are arranged in parallel so as to face each other on the cooling air upstream side of the heat exchanger unit 10.

  The cooling fan 3 is a so-called axial fan, and is attached to the auxiliary rotating shaft 34. A fan pulley 32 is fixed to the auxiliary rotating shaft 34 so as to be at a position corresponding to the crank pulley 31 of the engine crankshaft 35. A fan belt 33 is stretched between the crank pulley 31 and the fan pulley 32.

  The cooling fan 3 includes a boss 3a fixed to an auxiliary rotating shaft 34 to which a driving force from the engine crankshaft 35 is transmitted, and a plurality of blades 3b fixed around the boss 3a. Driven by the rotation of the shaft 34, a negative pressure is generated between the cooling fan 3 and the heat exchanger unit 10 to induce cooling air.

  The dustproof device includes a dustproof net 6, and the dustproof net 6 captures dust in the cooling air introduced from the opening 22 on the side surface. The dustproof net 6 has a mesh structure, and in a normal case, the mesh roughness is configured with an interval smaller than the fin pitch interval of the heat exchanger.

  A battery 18 is installed upstream of the cooling air at the bottom of the engine compartment 1 (opening 22 side). The battery 18 is a power source for electrical components, for example, a cell motor is rotated when the engine is started.

  As a characteristic configuration of the present embodiment, the dustproof device includes a first partition plate 7 and a second partition plate 8.

  The first partition plate 7 is provided at a position facing the opening 22 so as to be inclined so that its upper end is fixed to the ceiling frame of the engine compartment 1 and its lower end is closer to the heat exchanger unit 10 side. Yes. Moreover, the lower end part of the 1st partition plate 7 is open | released. The first partition plate 7 induces a downward flow, and the cooling air flowing in from the opening 22 is guided downward along the first partition plate 7.

  The second partition plate 8 is provided substantially vertically at the lower end of the first partition plate 7 at a position downstream of the cooling air and fixed to the bottom plate frame of the engine compartment 1. Moreover, the upper end part of the 2nd partition plate 8 is open | released. The second partition plate 8 induces an upward flow, and the cooling air guided downward from the first partition plate 7 is reversed and guided upward along the second partition plate 8. In addition, the 2nd partition plate 8 may incline so that an upper end part may approach the heat exchanger unit 10 side.

  Further, as a characteristic configuration of the present embodiment, the dustproof net 6 is provided so that one end is held by the first partition plate 7 and the other end is held by the second partition plate 8 and is arranged substantially horizontally. Is done. As a result, the dustproof net 6 is provided at a position on the downstream side of the cooling air of the second partition plate 8.

  FIG. 4 is an overall view of a hydraulic excavator that is an example of a construction machine to which the present embodiment is applied.

  The excavator 101 includes a frame 104 that constitutes an upper swing body 103 on a lower traveling body 102, and includes an engine chamber 1, a cabin 105, and a counterweight 106 on the frame 104. Further, a front attachment 110 including a boom 111 and a boom cylinder 112, an arm 113 and an arm cylinder 114, a bucket 115 and a bucket cylinder 116 is provided in front of the vehicle body.

~ Operation ~
Next, the operation and action of the present embodiment configured as described above will be described.

  When the engine 2 is driven during operation of the hydraulic excavator, the rotation of the crankshaft 35 is transmitted to the auxiliary rotation shaft 34 via the crank pulley 31, the fan belt 33, and the fan pulley 32. Thereby, the cooling fan 3 is driven and rotated. By the rotation of the cooling fan 3, outside air is taken into the engine compartment 1 from the openings 21 and 22 and flows as cooling air from the upstream side to enter the condenser 15 and the heat exchanger unit 10 (the radiator 11, the oil cooler 12, After the intercooler 13) is cooled, it is squeezed through the inside of the shroud 4 on the downstream side of the heat exchanger unit 10 and introduced into the suction side of the cooling fan 3. Thereafter, the cooling air blown out from the cooling fan 3 cools the engine 2, the hydraulic pump, and the like on the downstream side of the cooling fan 3, and then is discharged from the openings 23 and 24 to the outside of the engine room 1. In FIG. 1, the flow of cooling air is indicated by a solid line.

  The flow of the cooling air flowing from the opening 22 will be further described. The cooling air flows from the opening 22, hits the first partition plate 7 facing the opening 22, is guided downward along the first partition plate 7, and reverses by hitting the cover of the battery 18 at the bottom of the engine compartment 1. The cooling air reversed from the downward flow is guided upward along the second partition plate 8, passes through the dust-proof net 6, and merges with the cooling air flowing in from the opening 22.

  The flow of dust at this time will be described. In FIG. 1, the flow of dust is indicated by dotted lines. When the excavator 101 is operated in a place with a lot of dust or dust, the dust contained in the cooling air flowing from the openings 21 and 22 is captured by the dustproof nets 26 and 27. However, the amount of dust contained in the cooling air flowing from the opening 22 is larger than the amount of dust contained in the cooling air flowing from the opening 21, and dust having a particle size smaller than the roughness of the mesh of the dustproof net 27 is in the engine compartment. 1 flows in. Note that the dust contained in the cooling air flowing from the opening 21 is small, and even if it flows into the engine compartment 1, there is no problem.

  When the cooling air hits the first partition plate 7, the dust contained in the cooling air flowing from the opening 22 collides with the first partition plate 7 and falls, and a part of the dust accumulates in the lower part of the engine compartment 1. Part of the dust is guided downward along with the descending cooling air, and accumulates in the lower part of the engine compartment 1.

  As described above, the cooling air is reversed from the descending flow to the ascending flow, but most of the dust accumulated in the lower portion of the engine chamber 1 is not reversed by its own weight and maintains the accumulated state. Dust having a small specific gravity is guided upward along with the rising cooling air, but some of the dust contained in the upward flow falls due to gravity, and also collides with the second partition plate 8 and falls, and the lower part of the engine compartment 1 To deposit.

  Part of the dust contained in the upward flow reaches the dustproof net 6. Dust having a particle size smaller than the mesh roughness of the dustproof net 6 passes through the dustproof net 6 and also passes between the heat exchanger units 10, and enters the outside of the engine compartment 1 from the openings 23 and 24 together with cooling air. Released. On the other hand, part of the dust having a particle size larger than the roughness of the mesh of the dustproof net 6 collides with the dustproof net 6, falls due to gravity and accumulates in the lower part of the engine compartment 1, and part of the dust is captured by the dustproof net 6. .

  Since the dustproof net 6 is disposed substantially horizontally, a part of the dust trapped in the dustproof net 6 falls due to its own weight and accumulates in the lower part of the engine compartment 1.

  As a result of the operation as described above, most of the dust contained in the cooling air flowing from the opening 22 accumulates in the lower part of the engine compartment 1 and a small amount of dust is captured by the dust-proof net 6. Thereby, clogging of the dustproof net 6 can be suppressed.

  Cleaning inside the engine compartment 1 is performed using a compressor with the building cover 28 opened and closed. The dust accumulated in the lower part of the engine chamber 1 is blown off by the wind pressure of the compressor and is discharged from an opening (not shown) provided on the cooling air upstream side of the bottom of the engine chamber 1. Thereby, the inside of the engine compartment 1 can be easily cleaned.

~effect~
The effect of the present embodiment configured as described above will be described in comparison with a conventional dustproof device.

  FIG. 5 is a cross-sectional view showing an engine room provided with a conventional dustproof device for comparison. The same components as those in FIG. 1 are denoted by the same reference numerals. In the first embodiment, the dustproof device includes the first partition plate 7 and the second partition plate 8, whereas the conventional dustproof device does not have such a configuration. That is, in the first embodiment, the cooling air flows along a path that reverses from the downward flow to the upward flow, whereas in the conventional dustproof device, the cooling air flows through the shortest path connecting the opening 22 and the cooling fan 3.

  Further, in the first embodiment, the dustproof net 6 is disposed substantially horizontally, whereas the dustproof net 60 is disposed vertically so as to face the heat exchanger unit 10 and the condenser 15.

  In the conventional dustproof device, the line connecting the opening 22 for taking in the cooling air and the cooling fan 3 becomes the main path of the cooling air. As a result, the dust concentrates on the main path of the cooling air, and the cooling air path and the dustproof net 60 There is a problem that dust is concentrated and trapped in the peripheral area where the crossing occurs, and clogging is likely to occur.

  Furthermore, since the dustproof net 60 is installed vertically, once dust is captured, it is difficult to fall. When dust accumulates on the dustproof net 60, clogging occurs. If the clogging of the dustproof net 60 is left unattended, the amount of cooling air decreases and the cooling performance of the heat exchanger decreases, causing various problems. For example, if the cooling performance of the radiator 11 is lowered, the engine 2 is overheated. Therefore, it is necessary to frequently clean the dustproof net 60 to remove clogging. Cleaning the dust-proof net 60 involves attaching and detaching the dust-proof net 60. Therefore, it is troublesome if the dust-proof net 60 is easily clogged and the cleaning frequency increases.

  In contrast, in the present embodiment, by providing the first partition plate 7 and the second partition plate 8, the cooling air is guided to the cooling fan 3 through a path that reverses from the downward flow to the upward flow. Does not reverse due to its own weight and accumulates in the lower part of the engine compartment 1.

  As described above, most of the dust contained in the cooling air flowing from the opening 22 accumulates in the lower part of the engine compartment 1 and only a small amount of dust is captured by the dust-proof net 6. That is, the amount of dust trapped by the dustproof net 6 is reduced compared to the conventional case.

  Since the dustproof net 6 is disposed substantially horizontally, a part of the dust trapped in the dustproof net 6 falls due to its own weight and accumulates in the lower part of the engine compartment 1. That is, the amount of dust captured by the dustproof net 6 is further reduced.

  Thereby, clogging of the dustproof net 6 can be suppressed.

  Moreover, dust accumulates on the opening 22 side (building cover 28 side) at the lower part of the engine compartment 1, and the inside of the engine compartment 1 can be easily cleaned.

  As a result of the clogging of the dustproof net 6 being suppressed, the cleaning effort can be reduced by reducing the frequency of cleaning the dustproof net 6. It is possible to prevent the engine 2 from being overheated by reducing the labor for cleaning the dustproof net 6 and easily cleaning the inside of the engine compartment 1.

Second Embodiment
A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view showing an engine room 1 provided with a dustproof device for a construction machine according to a second embodiment of the present invention, and further includes an extension plate 9 in the configuration of the first embodiment.

  The extended plate 9 is provided continuously at the lower end of the first partition plate 7. As a result, the first partition plate 7 extends downward. In addition, you may provide the extended partition plate comprised integrally with the 1st partition plate 7 and the extended board 9. As shown in FIG.

  In the first embodiment shown in FIG. 1, there is a possibility that part of the dust in the downward flow deviates from the downward flow, reaches the dustproof net 6 from the lower end of the first partition plate 7, and is captured by the dustproof net 6. is there.

  In the present embodiment, by providing the extension plate 9, the dust in the downward flow is surely guided downward along with the descending cooling air without being deviated from the downward flow, and is accumulated in the lower portion of the engine chamber 1. Further, the dust colliding with the extension plate 9 increases, and the dust colliding with the extension plate 9 loses the velocity component in the horizontal direction (particularly in the direction approaching the heat exchanger unit 10), falls due to gravity, and falls below the engine chamber 1. accumulate. At this time, since the dust falls to the opening 22 side, it is rarely guided upward with the rising cooling air. As a result, the amount of dust captured by the dustproof net 6 is further reduced.

  Thereby, clogging of the dustproof net 6 can be further suppressed.

  In addition, by providing the extension plate 9, dust is accumulated on the opening 22 side (building cover 28 side) from the lower part of the engine compartment 1 as compared with the first embodiment. Cleaning inside the engine compartment 1 is performed using a compressor with the building cover 28 opened and closed. That is, when the building cover 28 is opened, dust is accumulated on the front side of the engine room 1. Thereby, cleaning in the engine compartment 1 can be performed more easily.

<Reference example>
A reference example of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view showing an engine room 1 provided with a dustproof device for a construction machine according to a reference example of the present invention. This embodiment includes a first partition plate 7 and a second partition plate 8 as in the first embodiment, and a dust-proof net 60 similar to a conventional dust-proof device.

  By providing the first partition plate 7 and the second partition plate 8, the cooling air is guided to the cooling fan 3 through a path that reverses from the downward flow to the upward flow, but most of the dust is not inverted by its own weight, and is therefore in the engine compartment. 1 Deposit at the bottom. Thereby, although it is inferior to 1st Embodiment, the clogging of the dustproof net 60 can be suppressed compared with the prior art.

DESCRIPTION OF SYMBOLS 1 Engine room 2 Engine 3 Cooling fan 4 Shroud 6,60 Dust-proof net 7 First partition plate 8 Second partition plate 9 Extension plate 10 Heat exchanger unit 11 Radiator 12 Oil cooler 13 Intercooler 14 Fuel cooler 15 Capacitor 18 Battery 21 , 22, 23, 24 Opening 25 Air guide 26 Dustproof net (top)
27 Dust-proof net (side)
28 Building cover 31 Crank pulley
32 Fan pulley
33 Fan Belt
34 Auxiliary rotating shaft 35 Engine crankshaft 101 Hydraulic excavator 102 Lower traveling body
113 Upper swing body
104 frame 105 cabin
106 Counterweight 110 Front attachment 111 Boom 112 Boom cylinder 113 Arm 114 Arm cylinder
115 buckets
116 bucket cylinder

Claims (3)

A cooling device that cools the heat exchanger device with the cooling air induced by the cooling fan and that is taken in through the opening is located on the upstream side of the cooling air in the heat exchanger device to capture dust in the cooling air. In a dustproof device for a construction machine equipped with a dustproof net,
A first partition plate provided facing the opening and inducing a downward flow;
A second partition plate that is provided on the downstream side of the cooling air of the first partition plate and on the upstream side of the cooling air of the dustproof net, and induces an upward flow that reverses from the downward flow. Dustproof device. The dustproof device for a construction machine according to claim 1,
The dustproof device for a construction machine, wherein the dustproof net is disposed substantially horizontally, one end of the dustproof net is held by the first partition plate, and the other end is held by the second partition plate. The dustproof device for a construction machine according to claim 1,
A dustproof device for a construction machine, further comprising an extension plate provided at a lower end portion of the first partition plate so that the first partition plate extends downward.

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