JP2014084627A - Exhaust system of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust system which circulates cooling air supplied to a heat exchanger to exhaust it to the outside of a construction machine, in the construction machine including a pair of structural members for holding an engine and a heat exchanger disposed at a position opposing to the engine.SOLUTION: An exhaust system is used for a construction machine including a pair of structural members for holding an engine, a heat exchanger disposed at a position opposing to the engine, and a cooling fan for supplying cooling air to the heat exchanger. The exhaust system has a passage connecting a pair of openings formed in the pair of structural members, the passage makes cooling air flowing from one opening of the pair of openings flow out from the other opening to circulate the cooling air supplied to the heat exchanger in the passage and exhausts the circulated cooling air to the outside of a construction machine.

Description

  The present invention relates to an exhaust device for a construction machine.

  A construction machine such as a hydraulic excavator has a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is drivably provided on the upper revolving body. There is something.

  An upper swing body of a construction machine includes a swing frame as a base, a cab that covers a driver seat provided on the swing frame, an engine room (exterior cover) that accommodates an engine and the like provided on the swing frame, and the like. There is something to prepare. Some revolving frames of the upper revolving structure include a pair of structural members (web, beam) for holding an engine or the like. Furthermore, as shown in Patent Document 1, for example, there is a swivel frame in which a heat exchanger (a radiator, an oil cooler, an intercooler, a fuel cooler, etc.) is disposed in the vicinity of the engine.

JP 2011-184872 A

  Construction machinery cools an engine etc. using the heat exchanger arranged near the engine. The heat exchanger sucks (intakes) outside air using, for example, a cooling fan, and cools a radiator or the like using the sucked outside air (cooling air).

  However, with the technique disclosed in Patent Document 1, the flow of cooling air may be blocked by a pair of structural members that hold the engine. That is, in the technique disclosed in Patent Document 1, the flow of the cooling air is retained by the pair of structural members, and the exhaust efficiency of the cooling air may be reduced.

  The present invention has been made under such circumstances, and is an exhaust device used for a construction machine having a structural member for holding an engine and a heat exchanger disposed at a position facing the engine. It is an object of the present invention to provide an exhaust device capable of circulating the supplied cooling air and exhausting it outside the construction machine.

  According to one aspect of the present invention, it includes a pair of structural members that hold an engine, a heat exchanger that is disposed at a position facing the engine, and a cooling fan that supplies cooling air to the heat exchanger. An exhaust apparatus for use in a construction machine, comprising: a passage connecting a pair of openings formed in the pair of structural members, wherein the passage receives cooling air flowing from one opening of the pair of openings to another Provided is an exhaust device for a construction machine, wherein the cooling air supplied to the heat exchanger is circulated in the passage by flowing out from the opening, and the circulated cooling air is exhausted to the outside of the construction machine. Is done. And a second opening formed on a side surface of the machine body facing the other opening, and a second passage communicating the second opening with the other opening. The second passage may be an exhaust device for a construction machine, characterized in that the cooling air flowing out from the other opening is exhausted from the second opening to the outside of the construction machine. Furthermore, it has the 3rd channel | path connected to the said other opening, The said 3rd channel | path is a substantially L-shaped channel | path, The cooling air which flowed out from the said other opening is made into the said construction machine. An exhaust device for a construction machine may be used, which exhausts air from the bottom to the outside of the construction machine.

  Moreover, according to the other aspect of this invention, a pair of structural member holding an engine, the heat exchanger arrange | positioned in the position facing the said engine, the cooling fan which supplies cooling air to the said heat exchanger, And an opening formed in one structural member disposed on the heat exchanger side of the pair of structural members, and a fourth passage connected to the opening. The fourth passage is a substantially L-shaped passage, and the cooling air supplied to the heat exchanger flows in from the opening, and the inflowing cooling air flows between the pair of structural members. There is provided an exhaust device for a construction machine, characterized in that exhaust is performed from the bottom of the construction machine to the outside of the construction machine.

  According to the exhaust device for a construction machine according to the present invention, in the construction machine having a pair of structural members that hold the engine and a heat exchanger disposed at a position facing the engine, the cooling air supplied to the heat exchanger is It can be circulated and exhausted outside the construction machine.

1 is a schematic external view illustrating an example of a construction machine that uses an exhaust device according to a first embodiment of the present invention. It is a schematic sectional drawing which shows an example of the engine room of the construction machine using the exhaust apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining a pair of structural member of the construction machine using the exhaust apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining an example of arrangement | positioning of the exhaust apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining an example of arrangement | positioning of the exhaust apparatus which concerns on the 2nd Embodiment of this invention.

  One non-limiting exemplary embodiment of the present invention will be described with reference to the accompanying drawings. In the description of all attached drawings, the same or corresponding members or parts are denoted by the same or corresponding reference numerals, and redundant description is omitted. Also, the drawings are not intended to show the relative ratio between members or parts. Accordingly, specific dimensions can be determined by one skilled in the art in light of the following non-limiting embodiments.

  Hereinafter, the present invention will be described using the exhaust device for a construction machine according to the present embodiment. In addition to the present embodiment, the present invention is a construction machine having a structural member for holding an engine and a heat exchanger for cooling the engine, as long as it has a configuration for exhausting cooling air supplied to the heat exchanger. , Can be used for any of them. Construction machines that can use the present invention include hydraulic excavators, crane cars, bulldozers, wheel loaders and dump trucks, pile driving machines, pile removers, water jets, mud drainage treatment equipment, grout mixers, depth machines. Includes foundation and drilling machines.

(First embodiment)
(Construction machine configuration)
A schematic configuration of a construction machine 100 according to a first embodiment in which the present invention can be used will be described with reference to FIG. Here, in the present embodiment, the construction machine refers to a hydraulic pump that is driven using engine power, a hydraulic cylinder that is driven (expanded) using pressure oil from the hydraulic pump, and a hydraulic actuator ( It is a machine that drives a working machine.

  As shown in FIG. 1, the construction machine 100 includes, as hydraulic actuators, a boom 11 whose base end is pivotally supported on the upper swing body 10Up, an arm 12 pivotally supported on the distal end of the boom 11, and a distal end of the arm 12. And a bucket 13 that is pivotally supported.

  The construction machine 100 extends and contracts the boom cylinder 11c in the longitudinal direction by supplying hydraulic oil (pressure oil) to the boom cylinder 11c of the boom 11. At this time, the boom 11 is driven in the vertical direction by expansion and contraction of the boom cylinder 11c. Moreover, the construction machine 100 controls the hydraulic oil supplied to the boom cylinder 11c according to the operation amount (and operation direction) of the operation lever of the operator (driver, operator). As a result, the construction machine 100 performs a desired operation according to the operation amount of the operation lever or the like.

  Similarly to the case of the boom 11, the construction machine 100 drives the arm 12 and the bucket 13 by the expansion and contraction of the arm cylinder 12c and the bucket cylinder 13c. The construction machine 100 controls the hydraulic oil supplied to the arm cylinder 12c and the bucket cylinder 13c as in the case of the boom cylinder 11c.

  Furthermore, the construction machine 100 uses the crawler driven by the traveling hydraulic motor provided in the lower traveling body 10Dw, and the construction machine 100 main body travels (front and rear, left and right) according to the operation amount of the operation lever of the operator. Move). In addition, the construction machine 100 performs a turning operation of the upper swing body 10Up using a swing device interposed between the lower traveling body 10Dw and the upper swing body 10Up.

  The construction machine 100 in which the present invention can be used includes a revolving frame (for example, 10UpB in FIG. 3) serving as a base in the upper revolving structure 10Up. Moreover, the construction machine 100 includes a structural member (for example, 20 W in FIG. 3) that holds the engine. Furthermore, the construction machine 100 further includes a heat exchanger 23 (FIG. 3) disposed near the engine 21 of the upper swing body 10Up, and an exhaust device 20D that exhausts the cooling air supplied to the heat exchanger 23.

  Hereinafter, the engine room 20 and the exhaust device 20D of the construction machine 100 according to the embodiment of the present invention will be described.

(Engine room)
FIG. 2 shows an example of the engine room 20 of the construction machine 100 according to the first embodiment of the present invention. The engine room in which the present invention can be used is not limited to that shown in FIG. That is, the engine 21 is held using a structural member to be described later, the outside air is sucked (intake) using a heat exchanger, and the outside air is exhausted using an exhaust device (members, parts, etc.) (engine room). The present invention can be applied to any construction machine if any.

  As shown in FIG. 2, the engine room 20 according to the present embodiment is a space surrounded by an engine hood 20h, an exterior cover 20e, and the like. That is, an engine 21, a hydraulic pump 22, a heat exchange device 23, and the like are mounted inside the engine room 20.

  Specifically, the construction machine 100 mounts the cab that covers the driver's seat, the engine chamber 20 that houses the engine 21, and the like on the swing frame 10UpB (FIG. 3) that is the base of the upper swing body 10Up. The engine chamber 20 of the upper swing body 10Up holds the engine 21 by using the structural member 20W (corresponding to “a pair of structural members” recited in the claims) of the swing frame 10UpB of the upper swing body 10Up. . Furthermore, the engine chamber 20 of the upper swing body 10Up is mounted with a heat exchanger 23 in the vicinity of the engine 21 on the swing frame 10UpB. The exhaust device 20D of the construction machine 100 according to the embodiment of the present invention will be described later (exhaust device).

  The engine 21 is held on the upper part of a structural member (web, beam) 20W disposed on the turning frame 10UpB via a mount member 20m. A heat exchanger 23 (for example, a cooling fan 23f) is disposed on the X1 direction side of the engine 21 (left side in the drawing, hereinafter referred to as “upstream side of cooling air”).

  The hydraulic pump 22 is disposed on the side of the engine chamber 20 opposite to the side on which the heat exchanger 23 is disposed (hereinafter referred to as “downstream side of cooling air”). The hydraulic pump 22 is a hydraulic source of a hydraulic cylinder (such as a boom cylinder 11c) that drives a hydraulic actuator (such as the boom 11). The construction machine 100 drives the hydraulic pump 22 using the power of the engine 21.

  In the present embodiment, the heat exchanger 23 includes a radiator unit (radiator) 23r including an oil cooler, an intercooler 23i, a fuel cooler 23e, and the like. The heat exchanger 23 further includes a cooling fan 23 f that is rotated by using the power of the engine 21 and a dust-proof net 23 n that captures dust flowing into the engine chamber 20. The cooling fan 23f may be rotated using a hydraulic motor or an electric motor instead of the power of the engine 21.

  The heat exchanger 23 takes in outside air as cooling air (cold air) into the engine room 20 by rotating the cooling fan 23 (suction). Thereby, the heat exchanger 23 can cool the inside of the engine compartment 20 using the cooling air taken into the engine compartment 20.

  Further, the heat exchanger 23 captures dust flowing into the engine compartment 20 together with the cooling air using the dustproof net 23n. Thereby, the heat exchanger 23 can prevent the inflowing dust from adhering to the radiator unit 23r.

  The cooling air flows toward the right side in FIG. That is, the arrow X1 direction side in the figure is the upstream side of the cooling air. Moreover, the arrow X2 direction in the figure is the downstream side of the cooling air.

  The radiator unit 23r is a unit in which a radiator that cools cooling water flowing in the engine 21 and an oil cooler that cools hydraulic oil of a hydraulic actuator (such as the boom cylinder 11) are unitized. The intercooler 23 i cools the supercharged air supplied to the engine 21. The fuel cooler 23e cools the fuel.

  The radiator unit 23r has a larger shape than the intercooler 23i and the fuel cooler 23e. For this reason, in the construction machine 100 (heat exchanger 23), the radiator 23r is disposed at a position close to the cooling fan 23f due to layout restrictions (for example, wiring such as piping and hoses).

  The intercooler 23i and the fuel cooler 23e may have a cooling capacity smaller than that of the radiator unit 23r. In addition, the construction machine 100 (heat exchanger 23) is provided with an intercooler 23i and a fuel cooler 23e on the upstream side of the cooling air of the radiator unit 23r (in the direction of the arrow X1 in the drawing) in order to reduce the size. Yes.

(Exhaust device)
The exhaust device 20D of the construction machine 100 according to the first embodiment of the present invention will be described with reference to FIGS. Here, Fig.4 (a) is a perspective view explaining arrangement | positioning of exhaust apparatus 20D which concerns on this embodiment. FIG. 4B is a side view for explaining the arrangement of the exhaust device 20D according to the present embodiment.

  As shown in FIG. 4A, the exhaust device 20D according to the present embodiment has a passage 20Da (in the claims) attached to the structural member 20W (corresponding to “a pair of structural members” in the claims). (Corresponding to “passage” in the description). In addition, the exhaust device 20D can further include a second passage 20Db (corresponding to a “second passage” recited in the claims) attached to the structural member 20Wb and the machine body side surface of the construction machine 100. .

  Here, the passage 20Da is a passage that connects a pair of openings 20Wao and 20Wbo (FIG. 3) formed in the pair of structural members 20Wa and 20Wb. The passage 20Da circulates the cooling air supplied to the heat exchanger 23 in the passage 20Da by flowing out the cooling air flowing in from one opening 20Wao of the pair of openings 20Wao and 20Wbo from the other opening 20Wbo. Thereafter, the passage 20Da exhausts the cooling air circulated in the passage 20Da to the outside of the construction machine 100.

  The second passage 20Db is a passage that connects another opening 20Wbo formed in the structural member 20Wb and the second opening 20Weo (FIG. 3) of the exterior cover 20e. The second passage 20Db allows the cooling air flowing out from the other opening 20Wbo of the pair of openings 20Wao and 20Wbo to flow out from the second opening 20Weo. Thereby, as shown in FIG. 4A and FIG. 4B, the second passage 20Db allows the cooling air supplied to the heat exchanger 23 to flow without blocking the flow of the cooling air. Can be exhausted outside the construction machine 100 without stagnation.

  The exhaust device 20D is a substantially L-shaped passage connected to the opening 20Wbo (other opening) instead of the second passage 20Db (corresponding to the “third passage” in the claims). May be used. In this case, the exhaust device 20D can exhaust the cooling air flowing out from the opening 20Wbo (other openings) from the bottom of the construction machine 100 to the outside using the third passage.

  As described above, according to the exhaust device 20D of the construction machine 100 according to the first embodiment of the present invention, the cooling air supplied to the heat exchanger 23 can be circulated in the passage 20Da and the second passage 20Db. The circulated cooling air can be exhausted outside the construction machine 100. Further, according to the exhaust device 20D according to the present embodiment, even when the engine is held by the pair of structural members 20W, the flow of the cooling air is not obstructed by using the passage 20Da and the second passage 20Db. In addition, the cooling air can be exhausted outside the construction machine 100 without retaining the flow of the cooling air. Further, according to the exhaust device 20D according to the present embodiment, the cooling air can be exhausted outside the construction machine 100 without blocking the flow of the cooling air and without retaining the flow of the cooling air. The exhaust efficiency of the cooling air can be improved.

  Further, according to the exhaust device 20D of the construction machine 100 according to the first embodiment of the present invention, the passage 20Da and / or the second passage 20Db can be spanned between the pair of structural members 20W. The strength of 100 swivel frames 10UpB can be improved.

(Second Embodiment)
(Configuration of construction machinery) and (Engine room)
Since the configuration of the construction machine 100 according to the second embodiment and the engine room 20 are the same as the configuration of the construction machine 100 according to the first embodiment, description thereof will be omitted.

(Exhaust device)
The exhaust device 20D of the construction machine 100 according to the second embodiment of the present invention will be described with reference to FIG. Here, Fig.5 (a) is a perspective view explaining arrangement | positioning of exhaust apparatus 20D which concerns on this embodiment. FIG. 5B is a side view for explaining the arrangement of the exhaust device 20D according to the present embodiment.

  As shown in FIGS. 5A and 5B, the exhaust device 20D according to the present embodiment includes a fourth passage 20Dc attached to one structural member 20Wa of the structural member 20W (described in claims). Corresponding to “fourth passage”).

  The fourth passage 20Dc is connected to an opening 20Wao formed in one structural member 20Wa arranged on the heat exchanger 23 side (upstream side of cooling air) of the pair of structural members 20Wa and 20Wb. The fourth passage 20Dc is a substantially L-shaped passage. Further, the fourth passage 20Dc flows the cooling air supplied to the heat exchanger 23 from the opening 20Wao, and exhausts the flowing cooling air to the outside from the bottom of the construction machine 100 between the pair of structural members 20W. Accordingly, as shown in FIG. 5B, the fourth passage 20Dc retains the cooling air supplied to the heat exchanger 23 without blocking the flow of the cooling air and the flow of the cooling air. Without being exhausted to the outside of the construction machine 100.

  As described above, according to the exhaust device 20D of the construction machine 100 according to the second embodiment of the present invention, the same effect as the exhaust device 20D of the construction machine 100 according to the first embodiment can be obtained.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above. That is, the present invention can be variously modified and changed within the scope of the gist of the present invention described in the claims.

100: Construction machine 10Up: Upper turning body 10UpB: Turning frame (base member)
10Dw: Undercarriage 11, 12, 13: Hydraulic actuator 11c, 12c, 13c: Hydraulic cylinder 20: Engine chamber 20W, 20Wa, 20Wb: Structural member (web, beam)
20Wao, 20Wbo, 20Weo: Opening 20D: Exhaust device 20Da, 20Db, 20Dc: Passage (duct)
20h: Engine hood 20e: Exterior cover 20m: Mount member 21: Engine 22: Hydraulic pump 23: Heat exchanger 23f: Cooling fan 23n: Dustproof net 23r: Radiator unit (radiator)
23i: Intercooler 23e: Fuel cooler

Claims (4)

An exhaust system used for a construction machine having a pair of structural members that hold an engine, a heat exchanger disposed at a position facing the engine, and a cooling fan that supplies cooling air to the heat exchanger,
A passage connecting a pair of openings formed in the pair of structural members;
The passage causes the cooling air flowing from one opening of the pair of openings to flow out from the other opening, thereby circulating the cooling air supplied to the heat exchanger in the passage, Exhausting outside the construction machine,
An exhaust device for a construction machine. A second opening formed on a side surface of the construction machine facing the other opening, and a second passage communicating the second opening and the other opening;
The second passage exhausts the cooling air flowing out from the other opening to the outside of the construction machine from the second opening.
The exhaust device for a construction machine according to claim 1. A third passage connected to the other opening;
The third passage is a substantially L-shaped passage, and the cooling air flowing out from the other opening is exhausted from the bottom of the construction machine to the outside of the construction machine.
The exhaust device for a construction machine according to claim 1. An exhaust system used for a construction machine having a pair of structural members that hold an engine, a heat exchanger disposed at a position facing the engine, and a cooling fan that supplies cooling air to the heat exchanger,
An opening formed in one structural member disposed on the heat exchanger side of the pair of structural members, and a fourth passage connected to the opening;
The fourth passage is a substantially L-shaped passage, and the cooling air supplied to the heat exchanger flows in from the opening, and the flowing cooling air flows between the pair of structural members of the bottom of the construction machine. Exhaust to the outside of the construction machine,
An exhaust device for a construction machine.

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