JP2020159260A - Construction machine - Google Patents

Abstract

To prevent warm air on an engine side from flowing onto an upstream side of a heat exchange device, to improve cooling performance of the heat exchange device.SOLUTION: An outgoing pipe conduit 18 and a return pipe conduit 23 are respectively composed of: an engine room outgoing pipe conduit part 19 and an engine room return pipe conduit part 26 arranged in an engine room 9A of a machine room 9; a machine room external outgoing pipe conduit part 20 and a machine room external return pipe conduit part 25 arranged on the outside 17 of the machine room 9 separated from the machine room 9; and an outside air inflow room outgoing pipe conduit part 22 and an outside air inflow room return pipe conduit part 24 arranged in an outside air inflow room 9B of the machine room 9.SELECTED DRAWING: Figure 3

Description

The present invention relates to a construction machine such as a hydraulic excavator equipped with an intercooler connected to an engine turbocharger.

In general, a hydraulic excavator as a typical example of a construction machine has a lower traveling body capable of traveling and an upper rotating body provided so as to be swivel on the lower traveling body, and a working device is raised or lowered on the upper rotating body. Is provided so that the operation of

The upper swivel body is provided in a swivel frame formed as a support structure, a partition plate extending in the left and right directions of the swivel frame, a machine room formed on the rear side of the partition plate, and a machine room. An engine equipped with a turbocharger, a frame provided in the machine room between the engine room in which the engine is placed and an outside air inflow chamber in which outside air flows in from the outside of the machine room, and a frame provided in the frame. It is configured to include a heat exchanger having a radiator, an oil cooler and an intercooler.

The upper swing body is an outward conduit connecting the turbocharger (compressed air discharge port) of the engine and the intercooler of the heat exchange device, and a return conduit connecting the intercooler and the intake side (intake manifold) of the engine. (See, for example, Patent Document 1). In Patent Document 1, the intercooler is arranged on the upstream side in the flow direction of the cooling air, and the radiator and the oil cooler are arranged on the downstream side of the intercooler. In this layout, the outward pipe and the return pipe connect the engine and the intercooler through the upper side of the radiator and the oil cooler.

Japanese Unexamined Patent Publication No. 2007-263094

By the way, in the configuration in which the outward pipe and the return pipe pass above the radiator and the oil cooler as in Cited Document 1, a shielding member is used to block the portion other than the portion through which each pipe passes. However, a gap is formed between each pipeline and the shielding member. For this reason, there is a possibility that the air warmed on the engine side wraps around to the upstream side of the heat exchanger through the gap, and there is a problem that the cooling performance is deteriorated.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent warm air on the engine side from sneaking into the upstream side of the heat exchanger and improve the cooling performance of the heat exchanger. It is to provide the construction machinery that has made it possible.

The present invention has a traveling lower traveling body and an upper rotating body rotatably provided on the lower traveling body, and the upper rotating body includes a swivel frame formed as a support structure and the swivel frame. A partition plate extending to the left and right of the swivel frame, a machine room formed behind the partition plate, an engine provided in the machine room and equipped with a turbocharger, and an engine provided in the machine room are arranged. A frame provided between an engine chamber in which the engine is arranged and an outside air inflow chamber into which outside air flows in from the outside of the machine chamber, and a radiator, an oil cooler, and an intercooler provided in the frame are included. A construction machine including a heat exchange device, an outward pipeline connecting the turbocharger of the engine and the intercooler of the heat exchange apparatus, and a return conduit connecting the intercooler and the intake side of the engine. In the engine chamber, the outward conduit is located outside the engine chamber and extends from the turbocharger of the engine toward the partition plate, and is arranged outside the machine chamber in the longitudinal direction. One end penetrates the partition plate and is connected to the engine chamber outward pipeline portion, and the other end penetrates the partition plate and protrudes into the outside air inflow chamber to the machine room external outward pipeline portion and the outside air inflow chamber. It is composed of an outside air inflow chamber outward conduit portion which is arranged and connects the other end of the machine room external outward conduit portion and the inflow side of the intercooler, and the return conduit is located in the outside air inflow chamber. The outside air inflow chamber return conduit portion extending from the outflow side of the intercooler toward the partition plate, and the outside air inflow chamber return conduit portion arranged outside the machine chamber and having one end in the length direction penetrating the partition plate. The other end of the machine room external return line portion connected to the portion and the other end penetrating the partition plate and projecting into the engine chamber, the other end of the machine room external return line portion arranged in the engine chamber, and the engine. It is composed of an engine chamber return conduit section connected to the intake side.

According to the present invention, it is possible to prevent the warm air on the engine side from sneaking into the upstream side of the heat exchange device, and to improve the cooling performance of the heat exchange device.

It is a front view which shows the hydraulic excavator which concerns on embodiment of this invention. It is an enlarged plan view which shows the hydraulic excavator which omitted the working apparatus. It is a top view of the main part enlarged which shows the rear part of the upper swing body in the state which omitted the outer cover. It is sectional drawing which shows the connection state of the outbound line and the return line to the intercooler enlarged from the direction of arrow IV-IV in FIG. It is a perspective view of the main part enlarged which shows the attachment state of the machine room external outbound pipe part and the machine room external return pipe part with respect to a partition plate from the left front side. It is sectional drawing which shows the attachment relationship between a partition plate, an outbound line and a return line.

Hereinafter, a crawler type hydraulic excavator will be taken as an example as a typical example of the construction machine according to the embodiment of the present invention, and will be described in detail with reference to FIGS. 1 to 6. In the present embodiment, the horizontal directions orthogonal to the front and rear directions are the left and right directions with respect to the front and rear directions of the upper swivel body, and the configuration, arrangement, and air flow direction of each device and member are defined. explain.

In FIG. 1, the hydraulic excavator 1 as a construction machine includes a crawler-type lower traveling body 2 that can travel, an upper rotating body 3 that is rotatably provided on the lower traveling body 2, and a front portion of the upper rotating body 3. It has a working device 4 provided so as to be able to move up and down. The work device 4 performs earth and sand excavation work and the like.

The swivel frame 5 constitutes a support structure for the upper swivel body 3. As shown in FIG. 2, the swivel frame 5 is erected on a flat bottom plate 5A made of a thick steel plate extending in the front and rear directions and a bottom plate 5A, and is erected on the bottom plate 5A and front in the left and right directions at predetermined intervals. , Left vertical plate 5B, right vertical plate 5C extending in the rear direction, bottom plate 5A, each vertical plate 5B, 5C overhanging outward in the left and right directions, and a plurality of plates are provided at intervals in the front and rear directions. On the right side of the overhanging beam (neither shown), the left side frame 5D extending forward and backward with a gap on the left side of the left vertical plate 5B, and attached to the tip side of each overhanging beam, and the right vertical plate 5C. It is configured to include a right side frame 5E (see FIG. 3) that extends forward and backward with an interval and is attached to the tip end side of each overhang beam.

The foot portion of the working device 4 is rotatably supported on the front portions of the left vertical plate 5B and the right vertical plate 5C. On the other hand, counterweights 6, which will be described later, are attached to the rear portions of the left vertical plate 5B and the right vertical plate 5C.

The counterweight 6 is provided at the rear position of the swivel frame 5 in order to balance the weight with the working device 4. As shown in FIGS. 2 and 3, the counterweight 6 is formed as an arc-shaped heavy object whose middle portions in the left and right directions project rearward.

As shown in FIGS. 1 and 2, the cab 7 is provided at a left front portion of the swivel frame 5. The cab 7 is for the operator to board, and inside the cab 7, a driver's seat on which the operator sits, an operation lever for traveling, an operation lever for work, and the like (none of which are shown) are arranged. As shown in FIG. 3, the cab 7 is arranged on the front side of the partition plate 8 described later, and the rear surface 7A faces the outside air inflow side plate portion 8B, which is the left side portion of the partition plate 8, at intervals in the front and rear directions. ing.

The partition plate 8 is located between the front and the rear of the swivel frame 5 and is erected on the swivel frame 5 extending in the left and right directions. The partition plate 8 extends from the left side frame 5D of the swivel frame 5 to a position beyond the right vertical plate 5C (a position close to the hydraulic oil tank 27), for example. Further, the partition plate 8 is arranged at a desired distance from the rear surface 7A of the cab 7. That is, the partition plate 8 forms a machine room 9 described later with the counterweight 6, and forms an outer 17 of the machine room 9 described later with the rear surface 7A of the cab 7.

The partition plate 8 covers the front side of the engine 10 and the heat exchange device 13, which will be described later, to partition the machine room 9 from the outside 17 of the machine room 9. As a result, the partition plate 8 uses the outside air sucked from the inflow port 29A1 provided on the left side of the upper swivel body 3, specifically, the left side cover portion 29A of the exterior cover 29, which will be described later, as cooling air for the engine. Distribute toward 10.

Here, the partition plate 8 can be divided into an engine side plate portion 8A located on the right side and an outside air inflow side plate portion 8B located on the left side. The engine side plate portion 8A partitions the front side of the engine chamber 9A described later, and the outside air inflow side plate portion 8B partitions the front side of the outside air inflow chamber 9B described later. The boundary position between the engine side plate portion 8A and the outside air inflow side plate portion 8B is, for example, the right end position of the frame body 12 or the vicinity position of the cooling fan 10C.

As shown in FIGS. 4 and 6, the partition plate 8 is provided with four through holes 8C to 8F. As shown in FIG. 3, the engine-side outbound pipe through hole 8C is provided at the upper left side position (position close to the frame body 12) of the engine-side plate portion 8A. The engine-side outbound pipe through hole 8C is penetrated by the upstream end 20A of the machine room external outbound pipe portion 20 forming the outbound pipe 18, which will be described later. Further, the outside air inflow side outbound pipe through hole 8D is provided at a lower right position (a position corresponding to the lower part of the intercooler 16) of the outside air inflow side plate portion 8B. The downstream end 20B of the outbound pipe section 20 outside the machine room penetrates the outbound pipe through hole 8D on the outside air inflow side.

On the other hand, the outside air inflow side return pipe through hole 8E is provided at the upper right side of the outside air inflow side plate portion 8B, that is, at a position above the outside air inflow side outbound pipe through hole 8D and corresponding to the lower part of the intercooler 16. .. The outside air inflow side return pipe through hole 8E is penetrated by the upstream end 25A of the machine room external return pipe portion 25 forming the return pipe 23 described later. The engine side return pipe through hole 8F is provided at the upper left position of the engine side plate portion 8A, specifically, on the right side of the engine side outbound pipe through hole 8C. The downstream end 25B of the machine room external return pipe section 25 penetrates the engine side return pipe through hole 8F.

The engine-side outbound pipe through hole 8C is arranged on the outside air inflow chamber 9B side of the engine-side return pipe through hole 8F. Therefore, in the outside 17 of the machine room 9, the temperature of the outbound pipe section 20 outside the machine room of the outbound pipe 18, which becomes high due to the heat of the exhaust gas or the heat of compression, becomes low due to the circulation of the air cooled by the intercooler 16. It is arranged on the left side of the return pipe section 25 outside the machine room of the return pipe 23. As a result, when the work is performed near the center of the swivel frame 5, the machine room external return line portion 25 of the low temperature return line 23 can be arranged on the work side, so that the outbound line becomes hot during the work. It is possible to suppress contact with the outbound pipe section 20 outside the machine room of 18.

The machine room 9 is formed on the rear side of the partition plate 8. Specifically, the machine room 9 is located in the left and right directions surrounded by the undercover of the swivel frame 5, the partition plate 8, the counterweight 6, the side cover portions 29A and 29B of the exterior cover 29, and the engine cover portion 29C. It is formed as a long space. The machine room 9 has an engine room 9A on the right side of the frame body 12, which will be described later, and an engine 10 is arranged in the engine room 9A. On the left side of the frame 12 as a boundary is an outside air inflow chamber 9B into which outside air flows in from the outside of the machine room 9. The outside air flows into the outside air inflow chamber 9B from the left side to the right side through the inflow port 29A1 provided in the left side cover portion 29A of the exterior cover 29 described later.

The engine 10 is located in the machine room 9 and is provided on the swivel frame 5. The engine 10 is arranged in the engine chamber 9A in a horizontal position extending in the left and right directions. A turbocharger 10A that compresses the intake air is provided on the rear side of the engine 10. Further, the engine 10 has an intake side 10B whose front side is an intake manifold or the like.

A suction type cooling fan 10C is provided on the left side of the engine 10. The cooling fan 10C is rotated by the engine 10 or an electric motor (not shown), and heat exchanges using the air (outside air) sucked from the outside through the inflow port 29A1 of the left side cover portion 29A of the exterior cover 29 as cooling air. It is supplied to the device 13. Further, on the right side of the engine 10, a hydraulic pump 11 described later is provided. Further, the exhaust side of the turbocharger 10A is connected to the exhaust gas aftertreatment device 10D.

The hydraulic pump 11 is provided on the right side of the engine 10. The hydraulic pump 11 is driven by the engine 10 to boost (pressurize) the hydraulic oil supplied from the hydraulic oil tank 27, which will be described later, and supply the hydraulic oil to various actuators such as the working device 4. The hydraulic oil that drives the various actuators is cooled by the oil cooler 15 of the heat exchange device 13 described later, and then recirculated to the hydraulic oil tank 27.

The frame body 12 is arranged in the machine room 9 located on the rear side of the upper swivel body 3. The frame body 12 is provided between the engine chamber 9A in which the engine 10 is arranged and the outside air inflow chamber 9B into which the outside air flows in from the outside of the machine room 9. The frame body 12 is formed as a square frame body extending in the front and rear directions between the counterweight 6 and the partition plate 8. The frame body 12 is formed of, for example, an outside air inflow side plate portion 8B, a rear surface plate 12A, a lower surface plate 12B, and an upper surface plate (not shown) of a partition plate 8 that also serves as a front plate. A fan shroud 12C is provided on the engine 10 side of the frame body 12 so as to surround the cooling fan 10C.

The heat exchange device 13 is provided on the frame body 12. The heat exchange device 13 cools various fluids such as engine cooling water, hydraulic oil, and intake air. The heat exchange device 13 is composed of a radiator 14, an oil cooler 15, and an intercooler 16, which will be described later.

The radiator 14 is provided along the fan shroud 12C so as to face the cooling fan 10C. The radiator 14 is connected to the water jacket of the engine 10 via a hose (neither is shown) in order to cool the engine 10 and cool the engine cooling water whose temperature has risen.

The oil cooler 15 is provided so as to face and overlap the radiator 14 on the upstream side in the flow direction of the cooling air. The oil cooler 15 cools the hydraulic oil supplied to the hydraulic actuators such as the traveling motor, the swivel motor, and the hydraulic cylinder of the working device 4 of the lower traveling body 2 and returns the hydraulic oil to the hydraulic oil tank 27. Therefore, a part of the hydraulic oil pipeline (not shown) connected to the oil cooler 15 penetrates the partition plate 8 and passes through the outside 17 of the machine room 9 described later.

The intercooler 16 is provided so as to face the left side of the oil cooler 15 so as to be located on the most upstream side in the flow direction of the cooling air as one of the heat exchangers. The intercooler 16 cools the intake air whose temperature has risen by the turbocharger 10A of the engine 10. This cooled intake air is supplied to the engine 10. Therefore, the intercooler 16 is connected to the turbocharger 10A of the engine 10 via the outbound line 18 described later, and is connected to the intake side 10B of the engine 10 via the return line 23 described later.

As shown in FIG. 4, the intercooler 16 includes a rectangular heat-dissipating portion 16A that is elongated in the upward and downward directions, an inflow pipe 16B that is provided below the heat-dissipating portion 16A so as to project forward, and an upper portion of the heat-dissipating portion 16A. It is composed of an outflow pipe 16C provided so as to project to the front side. The outside air inflow chamber outbound pipe portion 22 of the outbound pipe 18 is connected to the inflow pipe 16B, and the outside air inflow chamber return pipe portion 24 of the return pipe 23 is connected to the outflow pipe 16C.

The outer 17 of the machine room 9 is separated from the machine room 9 and formed as a space located on the front side of the partition plate 8. The left side portion of the outer 17 is a space located between the rear surface 7A of the cab 7 and the partition plate 8. The outside 17 forming this space is connected to, for example, a hydraulic oil pipeline connected to the oil cooler 15, a pipe body including a pipeline used for air conditioning in the cab 7, a battery, and sensors (none of which are shown). Electric wires, etc. are arranged. Further, on the outside 17 of the machine room 9, the machine room external outbound line portion 20 of the outbound line 18 and the machine room external return line portion 25 of the return line 23 are arranged.

Next, the configuration of the outward pipe line 18 and the return pipe line 23, which are characteristic parts of the present embodiment, will be described in detail.

The outbound line 18 connects the turbocharger 10A of the engine 10 and the intercooler 16 of the heat exchange device 13. In the outbound pipeline 18, the high-temperature compressed air discharged from the turbocharger 10A circulates toward the intercooler 16. The outbound pipe 18 is composed of an engine room outbound pipe portion 19, a machine room outside outbound pipe portion 20, and an outside air inflow chamber outbound pipe portion 22.

The engine chamber outbound pipeline portion 19 of the outbound pipe 18 is located in the engine chamber 9A and extends from the engine 10 toward the partition plate 8. The engine chamber outbound pipeline portion 19 is formed of a flexible resin hose. In the engine room outbound pipe section 19, the upstream end 19A in the length direction is connected to the exhaust side of the turbocharger 10A, and the downstream end 19B is connected to the upstream end 20A of the outbound pipe section 20 outside the machine room.

The outbound pipe section 20 outside the machine room of the outbound pipe 18 is provided outside 17 of the machine room 9. Most of the outbound pipe section 20 outside the machine room is arranged outside 17 except for the end portion in the length direction, and as shown in FIG. 5, it is bent in an L shape so as to avoid the return pipe 23 described later. ing.

As shown in FIGS. 3 and 6, the upstream end 20A, which is one end in the length direction, penetrates the engine side outbound pipe through hole 8C provided in the engine side plate portion 8A of the partition plate 8 and penetrates the engine chamber 9A ( It protrudes to the machine room 9) side. The downstream end 19B of the engine chamber outbound pipe section 19 is connected to the upstream end 20A. As a result, the machine room external outbound pipe section 20 is arranged on the outside 17 in succession to the engine room outbound pipeline portion 19 through the partition plate 8.

On the other hand, as shown in FIG. 4, the downstream end 20B, which is the other end in the length direction, penetrates the outside air inflow side outbound pipe through hole 8D provided in the outside air inflow side plate portion 8B of the partition plate 8 and flows into the outside air. It protrudes toward the chamber 9B (machine room 9). The upstream end 22A of the outside air inflow chamber outbound pipe section 22, which will be described later, is connected to the downstream end 20B.

Further, an upstream flange 20C is provided on the upstream end 20A side of the machine room external outbound pipe section 20. The upstream side flange 20C is attached to the partition plate 8 by using a bolt 21 in a state where the upstream end 20A is inserted into the engine side outbound pipe through hole 8C. Further, a downstream flange 20D is provided on the downstream end 20B side of the machine room external outbound pipe section 20. The downstream side flange 20D is attached to the partition plate 8 by using a bolt 21 in a state where the downstream end 20B is inserted into the outside air inflow side outbound pipe through hole 8D. As a result, the outbound pipe section 20 outside the machine room of the outbound pipe 18 is fixed to the partition plate 8.

The outside air inflow chamber of the outbound pipe 18 The outbound pipe portion 22 is located in the outside air inflow chamber 9B and extends in the front and rear directions. The outside air inflow chamber outbound pipe portion 22 is formed of a flexible resin hose, similarly to the engine chamber outbound pipe portion 19. In the outside air inflow chamber outbound pipe section 22, the upstream end 22A in the length direction is connected to the downstream end 20B of the machine room external outbound pipe section 20, and the downstream end 22B is connected to the inflow pipe 16B of the intercooler 16.

The return pipe 23 connects the intercooler 16 of the heat exchange device 13 and the intake side 10B of the engine 10. In the return pipe 23, the compressed air cooled by the intercooler 16 circulates toward the intake side 10B of the engine 10. The return pipe 23 is composed of an outside air inflow chamber return pipe portion 24, a machine room external return pipe portion 25, and an engine chamber return pipe portion 26.

The outside air inflow chamber of the return pipe 23 The return pipe portion 24 is located in the outside air inflow chamber 9B and extends in the front and rear directions. The outside air inflow chamber return pipe portion 24 is formed of a flexible resin hose, similarly to the outside air inflow chamber outbound pipe portion 22 of the outward pipe passage 18. In the outside air inflow chamber return pipe section 24, the upstream end 24A in the length direction is connected to the outflow pipe 16C of the intercooler 16, and the downstream end 24B is connected to the upstream end 25A of the machine room external return pipe portion 25 described later. There is.

The machine room outer return pipe section 25 of the return pipe 23 is provided on the outside 17 of the machine room 9 at the same time as the machine room outer outbound pipe portion 20 of the outbound pipe 18. Most of the external return pipe section 25 in the machine room is arranged outside 17 except for the end portion in the length direction, and is bent so as to straddle the upstream portion of the outward pipe line 18 as shown in FIG. ..

Further, the upstream end 25A, which is the other end in the length direction, penetrates the outside air inflow side return pipe through hole 8E provided in the outside air inflow side plate portion 8B of the partition plate 8 and penetrates the outside air inflow chamber 9B (machine room 9). It protrudes to the side. The downstream end 24B of the outside air inflow chamber return pipe section 24 is connected to the upstream end 25A.

On the other hand, the downstream end 25B, which is one end in the length direction, penetrates the engine side return pipe through hole 8F provided in the engine side plate portion 8A of the partition plate 8 and projects toward the engine chamber 9A (machine room 9) side. There is. The upstream end 26A of the engine chamber return pipe section 26, which will be described later, is connected to the downstream end 25B.

Further, an upstream flange 25C is provided on the upstream end 25A side of the machine room external return pipe section 25. The upstream side flange 25C is attached to the partition plate 8 by using a bolt 21 in a state where the upstream end 25A is inserted into the outside air inflow side return pipe through hole 8E. Further, a downstream flange 25D is provided on the downstream end 25B side of the machine room external return pipe section 25. The downstream side flange 25D is attached to the partition plate 8 by using a bolt 21 in a state where the downstream end 25B is inserted into the engine side return pipe through hole 8F. As a result, the machine room external return pipe section 25 of the return pipe 23 is fixed to the partition plate 8.

The engine chamber return line portion 26 of the return line 23 is located in the engine room 9A and extends from the partition plate 8 toward the engine 10. The engine chamber return line portion 26 is formed of a flexible resin hose. In the engine chamber return line portion 26, the upstream end 26A in the length direction is connected to the downstream end 25B of the machine room external return line section 25, and as shown in FIG. 3, the downstream end 26B is the intake side 10B of the engine 10. It is connected to the.

Here, the outbound pipeline 18 becomes hot because compressed air that has become hot due to the heat of the exhaust gas or the heat of compression flows through the outbound pipe line 18. On the other hand, since the air cooled by the intercooler 16 flows through the return pipe line 23, the temperature becomes lower than that of the outbound pipe line 18. Then, in the vicinity of the center of the swivel frame 5 (between the foot portion of the work device 4 and the engine 10 (partition plate 8)), an operator gets in and performs maintenance such as a control valve (not shown). In this case, the machine room external outbound pipe section 20 of the outbound pipe 18 and the machine room external return pipe portion 25 of the return pipe 23 are arranged near the work place. Therefore, it is necessary for the operator to carefully work so as not to come into contact with the machine room external outgoing pipe section 20, the machine room external return pipe portion 25, and particularly the machine room external outgoing pipe portion 20 which has become hot. is there.

However, the outbound pipe section 20 outside the machine room of the outbound pipeline 18, which becomes hot, works on the left side of the outbound pipeline portion 25 outside the machine room of the return pipe 23, that is, near the center of the swivel frame 5. It is located away from the worker. As a result, the operator can work efficiently without worrying about the contact of the outbound pipe 18 with the outbound pipe portion 20 outside the machine room.

As shown in FIG. 2, the hydraulic oil tank 27 stores hydraulic oil, is located on the front side of the hydraulic pump 11, and is provided on the swivel frame 5. The fuel tank 28 stores fuel supplied to the engine 10 and is provided on the swivel frame 5 adjacent to the front side of the hydraulic oil tank 27.

The exterior cover 29 is located between the counterweight 6 and the cab 7 and is provided on the swivel frame 5. The exterior cover 29 covers the mounted equipment on the swivel frame 5 including the engine 10, the hydraulic pump 11, and the heat exchange device 13. The exterior cover 29 is composed of a left side cover portion 29A covering the left side of the machine room 9, a right side cover portion 29B covering the right side of the machine room 9, and an engine cover portion 29C covering the engine 10 and the like from above. .. The left side cover portion 29A is provided with an inflow port 29A1 (see FIG. 1) for allowing outside air to flow into the outside air inflow chamber 9B of the machine room 9.

The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and its operation will be described next.

The operator of the hydraulic excavator 1 gets on the cab 7 of the upper swing body 3 and starts the engine 10 to drive the hydraulic pump 11. As a result, pressure oil is discharged from the hydraulic pump 11, and this pressure oil is supplied to various hydraulic actuators via the control valve.

The operator in the cab 7 can move the lower traveling body 2 forward or backward by operating the traveling operation lever. On the other hand, by operating the operation lever for work, the work device 4 can be operated to perform earth and sand excavation work and the like.

When the hydraulic excavator 1 is in operation, the cooling fan 10C allows outside air to flow in from the inflow port 29A1 of the left side cover portion 29A of the exterior cover 29, and circulates from the outside air inflow chamber 9B toward the engine chamber 9A. As a result, in the heat exchange device 13, the cooling air flows from the outside air inflow chamber 9B toward the engine chamber 9A, so that the engine cooling water is cooled by the radiator 14, the hydraulic oil is cooled by the oil cooler 15, and the intercooler 16 is used. Cools the intake air to the engine 10.

In this way, when the outside air is used as cooling air and passed through the heat exchanger 13, for example, in a configuration in which the outward pipe and the return pipe pass above the radiator and the oil cooler, the surroundings of the outward pipe and the return pipe are There is a risk that warm air on the engine chamber side will wrap around to the outside air inflow chamber side through the gap. In this case, the cooling performance of the heat exchanger is deteriorated.

However, according to the present embodiment, the outbound line 18 is located in the engine room 9A of the machine room 9 and extends from the turbocharger 10A of the engine 10 toward the partition plate 8. , One end in the length direction penetrates the partition plate 8 and is connected to the outbound pipe section 19 of the engine chamber, and the other end penetrates the partition plate 8 and is arranged outside 17 of the machine chamber 9 partitioned from the machine chamber 9. The outside air inflow chamber 20 that protrudes into the outside air inflow chamber 9B and the outside air inflow chamber that is arranged in the outside air inflow chamber 9B and connects the other end of the machine room outside outbound pipe 20 to the inflow side of the intercooler 16. It is composed of an outbound pipe section 22.

Further, the return pipe line 23 is located in the outside air inflow chamber 9B of the machine room 9, and extends from the outflow side of the intercooler 16 toward the partition plate 8 as well as the outside air inflow chamber return pipe portion 24 and the outside 17 of the machine room 9. One end in the length direction penetrates the partition plate 8 and is connected to the outside air inflow chamber return pipe portion 24, and the other end penetrates the partition plate 8 and protrudes into the engine chamber 9A. It is composed of a section 25 and an engine chamber return line section 26 arranged in the engine chamber 9A and connecting the other end of the machine room external return line section 25 and the intake side 10B of the engine 10.

Therefore, since no gap is formed between the engine chamber 9A of the machine room 9 and the outside air inflow chamber 9B by the outward pipe line 18 and the return pipe line 23 for the intercooler 16, the upstream of the heat exchange device 13 It is possible to prevent the warm air on the engine 10 side from wrapping around to the side. As a result, the cold outside air flowing into the outside air inflow chamber 9B from the outside can be constantly supplied to the heat exchange device 13, and the cooling performance of the heat exchange device 13 can be improved.

The partition plate 8 is located on the front side of the engine chamber 9A, and is located on the engine side outbound pipe through hole 8C through which the outbound pipe portion 20 outside the machine room of the outbound pipe 18 penetrates, and the machine room external restoration of the return pipe 23. An engine-side return pipeline through hole 8F through which the pipeline portion 25 penetrates is provided. On this basis, the engine-side outbound pipe through hole 8C is arranged closer to the outside air inflow chamber 9B than the engine-side inbound pipe through hole 8F.

Therefore, the outbound pipe section 20 outside the machine room of the outbound pipeline 18, which becomes hot, performs the work on the left side of the outbound pipe section 25 outside the machine room of the return pipe 23, that is, near the center of the swivel frame 5. It can be placed at a position away from the worker. As a result, the operator can perform the work without worrying about the contact of the outbound pipe 18 with the machine room external outbound pipe portion 20, and the work efficiency can be improved.

The machine room outer outbound pipe section 20 of the outbound pipe 18 and the machine room outer return pipe portion 25 of the return pipe 23 are each formed of a metal pipe and fixed to the partition plate 8. Further, the engine chamber outbound pipe section 19, the outside air inflow chamber outbound pipe portion 22, the outside air inflow chamber return pipe portion 24, and the engine chamber return pipe portion 26 are each formed of a flexible resin hose. ing.

Therefore, the metal outbound pipe section 20 outside the machine room and the return pipe section 25 outside the machine room are rigid by being fixed to the partition plate 8. As a result, the pipeline portions 20 and 25 can be prevented from being damaged due to contact with tools or the like during maintenance, for example. Further, the pipeline portions 20 and 25 can be attached to the partition plate 8 in advance, and the assembly workability can be improved. On the other hand, the flexible engine chamber outbound pipe section 19, the outside air inflow chamber outbound pipe portion 22, the outside air inflow chamber return pipe portion 24, and the engine chamber return pipe portion 26 can handle complicated arrangement routes. can do. Further, each of the pipeline portions 19, 22, 24, 26 can absorb the difference in the frequency of vibration generated between the turning frame 5 and the engine 10.

The upper swivel body 3 is provided with a cab 7 located on the front side of the partition plate 8 on which the operator gets in. The outer 17 of the machine room 9 is a space located between the cab 7 and the partition plate 8. As a result, in the outside 17 as a space, pipes and electric wires can be arranged, and the existing space can be used to utilize the existing space in the machine room outside the outbound pipe section 20 of the outbound pipe 18 and the machine room of the return pipe 23. The external return line portion 25 can be arranged.

In the embodiment, a case where the machine room external outbound pipe section 20 and the machine room external return pipe section 25 are formed of a metal pipe is illustrated, and the engine room outbound pipeline section 19 and the outside air inflow chamber outbound An example shows a case where the pipeline portion 22, the outside air inflow chamber return pipeline portion 24, and the engine chamber return pipeline portion 26 are formed by a flexible resin hose. However, the present invention is not limited to these configurations, and for example, the machine room external outbound pipe section 20 and the machine room external return pipe section 25 are made of a resin hose or a metal pipe and a resin hose. It may be formed as a complex. Further, the engine chamber outbound pipe section 19, the outside air inflow chamber outbound pipe portion 22, the outside air inflow chamber return pipe portion 24, and the engine chamber return pipe portion 26 are made of a metal pipe or a metal pipe and a resin hose. It may be formed as a complex with.

In the embodiment, the crawler type hydraulic excavator 1 has been described as an example of the construction machine, but the present invention is not limited to this, and is widely applied to other construction machines such as wheel type hydraulic excavators and hydraulic cranes. Can be applied.

1 Hydraulic excavator (construction machinery)
2 Lower traveling body 3 Upper swivel body 5 Swivel frame 7 Cab 8 Partition plate 8C Engine side outbound pipe through hole 8F Engine side return pipe through hole 9 Machine room 9A Engine room 9B Outside air inflow room 10 Engine 10A Turbocharger 10B Intake side 12 Frame 13 Heat exchanger 14 Radiator 15 Oil cooler 16 Intercooler 17 External (space)
18 Outward pipeline 19 Engine room outbound pipeline section 20 Machine room external outbound pipeline section 22 Outside air inflow chamber outbound pipeline section 23 Return pipeline 24 Outside air inflow chamber return pipeline section 25 Machine room external return pipeline section 26 Engine room Return pipe section

Claims (4)

It has a lower traveling body that can travel and an upper rotating body that is provided so as to be able to turn on the lower traveling body.
The upper swivel body
A swivel frame formed as a support structure and
A partition plate extending to the left and right of the swivel frame and
A machine room formed on the rear side of the partition plate and
An engine equipped with a turbocharger installed in the machine room and
A frame body arranged in the machine room and provided between an engine room in which the engine is arranged and an outside air inflow chamber into which outside air flows in from the outside of the machine room.
A heat exchange device including a radiator, an oil cooler and an intercooler provided on the frame body,
An outbound pipeline connecting the turbocharger of the engine and the intercooler of the heat exchanger.
In a construction machine provided with a return pipe connecting the intercooler and the intake side of the engine.
The outbound pipe is located outside the engine chamber and extends from the turbocharger of the engine toward the partition plate, and is arranged outside the machine chamber and has one end in the length direction. It is arranged in the outside air inflow chamber of the machine room, which penetrates the partition plate and is connected to the outbound pipe portion of the engine chamber, and the other end of which penetrates the partition plate and protrudes into the outside air inflow chamber. It is composed of an outside air inflow chamber outbound pipe portion connecting the other end of the machine room external outbound pipe portion and the inflow side of the intercooler.
The return pipe is located outside the outside air inflow chamber and extends from the outflow side of the intercooler toward the partition plate, and is arranged outside the machine chamber and is one end in the length direction. Is arranged in the engine chamber and the machine room external return pipe portion that penetrates the partition plate and is connected to the outside air inflow chamber return pipe portion and the other end penetrates the partition plate and protrudes into the engine chamber. A construction machine characterized by being composed of an engine chamber return line portion connecting the other end of the machine room external return line portion and the intake side of the engine. The partition plate is located on the front side of the engine chamber, and has an engine-side outbound pipeline through hole through which the outbound pipeline portion outside the machine room of the outbound pipeline penetrates and an external restoration in the machine room of the return pipeline. An engine-side return pipeline through hole is provided through which the pipeline section penetrates.
The construction machine according to claim 1, wherein the engine-side outward pipe through hole is arranged closer to the outside air inflow chamber side than the engine-side return pipe through hole. The outbound pipe section outside the machine room of the outbound pipe and the outside return pipe portion in the machine room of the return pipe are each formed of a metal pipe and fixed to the partition plate.
The engine chamber outward pipe section, the outside air inflow chamber outward pipe section, the outside air inflow chamber return pipe section, and the engine chamber return pipe portion are each formed of a flexible resin hose. The construction machine according to claim 1, wherein the construction machine is characterized in that. The upper swing body includes a cab located on the front side of the partition plate and on which an operator can board.
The construction machine according to claim 1, wherein the outside of the machine room is a space located between the cab and the partition plate.

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