JP2003322488A - Heat exchanger of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide sufficient cooling air to a heat exchanger even when a plurality of dustproof net division bodies adjacent to each other on the upstream side of the heat exchanger. <P>SOLUTION: A left side edge part 37C of a net supporting frame 37 to constitute a dustproof net division body 35 is folded in the cooling air flowing direction orthogonal to a plane of a net 36, a right side edge part 41D of a net supporting frame 41 to constitute a dustproof net division body 39 is folded in the cooling air flowing direction orthogonal to a plane of a net 40, and the left side edge part 37C of the net supporting frame 37 and the right side edge part 41D of the net supporting frame 41 are butted to each other. Even when the dustproof net division bodies 35 and 39 are disposed adjacent to each other in the right-to-left direction, the width of a narrow butting surface 42 formed at a butt position of both edge parts is kept small, and impairment of the flow of the cooling air is suppressed by the narrow butting surface 42, and cooling air is sufficiently supplied to an oil cooler 18 and a radiator 12. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanging device for a construction machine, which is preferably used for construction machines such as hydraulic excavators and hydraulic cranes.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators, hydraulic cranes, etc., have a self-propelled lower traveling structure, an upper revolving structure provided on the lower traveling structure so as to be revolvable, and an upper revolving structure. And a working device that is movably provided.

The upper revolving structure includes a revolving frame serving as a base, a cab or a canopy provided on the revolving frame for covering a driver's seat, an outer cover provided on the revolving frame for accommodating an engine and the like, and a revolving frame. Generally composed of a counter weight provided at the rear end of the
A heat exchange device is provided on the revolving frame in the vicinity of the engine.

Here, the heat exchange device is provided on a heat exchanger such as a radiator or an oil cooler, which is attached to the revolving frame and cools liquids such as engine cooling water and hydraulic oil, facing the heat exchanger. It is composed of a cooling fan that supplies cooling air to the exchanger, and a dustproof net made up of a plurality of dustproof net divided bodies provided upstream of the heat exchanger in the middle of the cooling air by the cooling fan (for example, , JP-A-1
1-190215, etc.).

The heat exchanger cools the engine cooling water by exchanging heat of the engine cooling water flowing through the radiator with a heat radiating portion when the cooling air from the cooling fan passes through the radiator. When the cooling air passes through the oil cooler, the heat of the working oil flowing in the oil cooler is exchanged with the heat radiating portion to cool the working oil.

[0006] Further, each dustproof net divided body constituting the dustproof net catches dust mixed in the cooling air supplied to the heat exchanger to prevent the dust from adhering to the radiator, the oil cooler and the like. To prevent.

Here, the conventional dustproof net will be described with reference to FIG. 16. Reference numeral 101 denotes the heat exchanger 1.
02 is a dustproof net arranged upstream of the 02. The dustproof net 101 is composed of two dustproof net divided bodies 103, 1 described later.
It is composed of 06.

Reference numeral 103 denotes a first dustproof net divisional body, and the dustproof net divisional body 103 captures dust in the cooling air and a net support frame surrounding the outer periphery of the net 104 over the entire circumference. With 105, it is formed into a thin flat plate shape as a whole.

Here, the net support frame 105 includes a lower edge portion 105A located on the lower side in the upper and lower directions, an upper edge portion 105B located on the upper side in the upper and lower directions, and left and right side edge portions. 105
C and 105D.

Reference numeral 106 denotes a second dustproof net divisional body, and the dustproof net divisional body 106 is also formed as a thin flat plate as a whole by the net 107 and the net support frame 108.
The net support frame 108 includes a lower edge portion 108A and an upper edge portion 10A.
8B and left and right side edge portions 108C and 108D.

Then, each dustproof net division body 103, 10
6 has a configuration in which the left side edge portion 105C of the net support frame 105 and the right side edge portion 108D of the net support frame 108 are butted against each other and are arranged adjacent to each other on the same plane.

[0012]

However, in the above-mentioned prior art, the dustproof net divided body 103 (net support frame 10) is used.
5) The lower edge portion 105A, the upper edge portion 105B, and the left and right side edge portions 105C and 105D are formed in a flat plate shape, and the lower edge portion 108 of the dustproof net division body 106 (net support frame 108).
A, upper edge 108B, left and right side edges 108C, 108
D is formed in a flat plate shape.

Therefore, the dustproof net divisions 103, 10
When 6 are arranged adjacent to each other, the dustproof net division body 10
The left side edge portion 105C of No. 3 and the right side edge portion 108D of the dustproof net division body 106 come to face the heat exchanger 102, and impede the flow of cooling air at the abutting position of the dustproof net division bodies 103 and 106. A wide wide abutting surface 109 having a width T that is formed is formed.

Therefore, when the cooling air passes through the dustproof net 101 and is supplied to the heat exchanger 102, the flow of the cooling air is obstructed by the wide abutting surface 109, and the heat exchanger 102 receives the cooling air. There is a problem that sufficient cooling air cannot be supplied.

On the other hand, each dustproof net divided body 103, 106
Has a low strength and is easily bent because it is formed as a thin flat plate as a whole. Therefore, each dustproof net division body 10
There is a problem that 3 and 106 are bent by the wind pressure of the cooling air to cause flapping.

Further, each dustproof net divided body 103, 10
There is a possibility that the dustproof net divided bodies 103 and 106 may be inadvertently deformed during the installation, removal, cleaning, etc. of the 6.

The present invention has been made in view of the above-mentioned problems of the prior art. Even when a plurality of dustproof net divided bodies are arranged adjacent to each other on the upstream side of the heat exchanger, sufficient cooling air can be supplied to the heat exchanger. It is an object of the present invention to provide a heat exchanging device for a construction machine, which is capable of supplying heat and increasing the strength of each dustproof net divided body.

[0018]

In order to solve the above-mentioned problems, the present invention provides a heat exchanger mounted on a frame constituting a construction machine for cooling a heated liquid, and a heat exchanger facing the heat exchanger. A cooling fan that is provided to supply cooling air to the heat exchanger and a cooling fan that faces the upstream side of the heat exchanger in the middle of the flow of the cooling air by the cooling fan and are arranged adjacent to each other on the same plane. It is applied to a heat exchange device for a construction machine, which comprises a dustproof net composed of a plurality of divided dustproof nets.

The feature of the invention of claim 1 is that each of the dustproof net divided bodies constituting the dustproof net surrounds the net, which faces the heat exchanger and catches dust in the cooling air, and the outer periphery of the net. A net supporting frame is provided, and the net supporting frame is provided with a bent curved surface that extends substantially orthogonal to the surface of the net at the abutting position of the adjacent dustproof net divided bodies.

With this configuration, the bent curved surfaces provided on the net support frame of each dustproof net division body extend in the flow direction of the cooling air in a state of being abutted against each other, so that each of them is located upstream of the heat exchanger. When the dustproof net divisions are arranged adjacent to each other, it is possible to prevent the net support frame of each of the dustproof net divisions from inhibiting the flow of the cooling air. Also,
Since the bent curved surface of the net support frame is bent in a direction substantially orthogonal to the surface of the net, the net supported frame can be reinforced by the bent curved surface, and the dustproof net divided body in the flow direction of the cooling air. The strength of can be increased.

According to a second aspect of the invention, the net support frame is
A lower edge portion located on the lower side of the downward direction and extending in the left and right directions,
Left and right upper edges that are located on the upper side in the upper and lower directions and that extend in the left and right directions, and left and right sides that are located on the left and right ends of these lower edge and upper edges. It is formed in a quadrangular shape surrounded by the edge portion, and the folded curved surface is provided on the left edge portion and the right edge portion of the net support frame.

With this configuration, when a plurality of dustproof net divided bodies are arranged adjacent to each other on the left and right sides,
Regardless of the positional relationship of these dustproof net divisions in the left and right directions, the bent curved surfaces provided on the left and right edges of the net support frame can be reliably abutted against each other, and the dustproof net for the heat exchanger can be secured. Is easy to install, and workability during this installation can be improved.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a heat exchange device for a construction machine according to the present invention will be described in detail with reference to FIGS.

In the figure, reference numeral 1 denotes a small-turn type hydraulic excavator to which the present embodiment is applied. The hydraulic excavator 1 is a self-propelled tracked lower traveling body 2 and an upper traveling body 2 on the lower traveling body 2. The upper revolving structure 3 is rotatably mounted on the upper revolving structure 3 and a working device (not shown) provided on the front side of the upper revolving structure 3 so as to be able to move up and down.

The upper revolving structure 3 is a revolving frame 4 serving as a base formed of, for example, a thick steel plate.
And a driver's seat (not shown) provided on the revolving frame 4
5, a canopy 5 that covers the above from above, an exterior cover 6 that is opened and closed on the right side and rear side of the canopy 5, and that houses an engine 8, a heat exchange device 11, and the like, which will be described later, and a rear end portion of the revolving frame 4. And the counter weight 7 provided in the.

Here, as shown in FIG. 3 etc., the revolving frame 4 includes left and right vertical plates 4A, 4A, a bottom plate 4B provided on the lower surface side of each vertical plate 4A, and a bottom plate 4B. The radiator support base 4C and the like provided therein are included.

An engine 8 is located on the front side of the counterweight 7 and is provided on the bottom plate 4B of the revolving frame 4.
The engine 8 is arranged in a horizontal state extending in the left and right directions. A hydraulic pump 9 is attached to the left end side of the engine 8. The hydraulic pump 9 is driven by the engine 8 and discharges hydraulic oil toward a hydraulic actuator (not shown) mounted on a hydraulic excavator. is there.

Here, the upper swing body 3 is formed in a substantially circular shape when viewed from above in order to reduce the swing radius thereof, and the counterweight 7 is arranged as close to the engine 8 as possible. Therefore, the space inside the outer cover 6 is narrow, and various devices such as the engine 8, the hydraulic pump 9, the heat exchange device 11 and the like are compactly housed in the outer cover 6 in a state of being close to each other.

Reference numeral 11 denotes a heat exchange device located inside the exterior cover 6 and provided on the revolving frame 4.
Is composed of a radiator 12, an oil cooler 18, a cooling fan 24, dustproof net divisions 35 and 39, etc., which will be described later.

A radiator 12 constitutes a heat exchanger together with an oil cooler 18, and the radiator 12 is a bottom plate 4 constituting a revolving frame 4, as shown in FIGS. 4 to 7.
Radiator support 4C fixed on B by welding or the like
Installed on top.

Here, the radiator 12 is attached to the radiator support 4C with bolts 13 and extends upward and downward, and the radiator 14 is held in the upper and lower intermediate portions of the frame 14 to cool the engine. A heat radiating portion 15 including a flow pipe through which water flows and a large number of heat radiating fins, an upper tank 16 arranged above the heat radiating portion 15 and communicating with the flow pipe of the heat radiating portion 15, and below the heat radiating portion 15. , And a lower tank 17 communicating with the flow pipe of the heat radiating portion 15.

Further, the frame body 14 is a radiator support base 4C.
A bottom frame 14A mounted on the upper side, and left and right side frames 14B, 14 extending upward from both left and right sides of the bottom frame 14A.
It is composed of C and.

Then, the upper tank 1 of the radiator 12
6 and the lower tank 17 are connected to the water jacket of the engine 8 via piping (neither is shown), and the radiator 12 heats the engine cooling water circulating between the engine 8 and the radiator 8 at the heat radiating portion 15. This engine cooling water is cooled by exchanging heat and discharging it into the cooling air.

Reference numeral 18 denotes an oil cooler that constitutes a heat exchanger together with the radiator 12, and the oil cooler 18 is the frame body 1.
4, which are supported by four support arms 20, 20, ... Fixed to the left and right side frames 14B, 14C using bolts 19 and flow direction of cooling air by a cooling fan 24 described later (FIG. 5, FIG. It is arranged on the upstream side of the radiator 12 with respect to the arrow A direction in FIG.

Here, the oil cooler 18 has a rectangular heat radiating portion 21 composed of a flow pipe through which the working oil flows and a large number of heat radiating fins, and is arranged on the left and right with the heat radiating portion 21 interposed therebetween. It is constituted by tanks 22 and 23 communicating with the flow pipe, and these tanks 22 and 23 are supported by the support arm 20 described above.

One tank 22 is connected to a return pipe from the hydraulic actuator, the other tank 23 is connected to a hydraulic oil tank (neither is shown) via the pipe, and the oil cooler 18 is connected to the hydraulic actuator. The heat of the hydraulic oil that flows back from the hydraulic oil tank to the hydraulic oil tank is exchanged by the heat radiating portion 21 and released into the cooling air to cool the hydraulic oil.

Reference numeral 24 denotes a suction-type cooling fan provided so as to face the radiator 12, and the cooling fan 24 is rotationally driven by the engine 8 to pass through a plurality of vent holes 6A formed in the exterior cover 6. Exterior cover 6
The outside air (cooling air) is sucked into the inside, and the cooling air is supplied toward the oil cooler 18 and the radiator 12.
Further, between the cooling fan 24 and the radiator 12, a fan shroud 25 that covers the cooling fan 24 over the entire circumference is provided.
Is provided.

Reference numeral 26 denotes a sandwiching member provided on the upstream side of the oil cooler 18 with respect to the flow direction of the cooling air. The sandwiching member 26 is a lower edge portion 37A, 41A of each dustproof net segment 35, 39 described later. The dustproof net divided bodies 35 and 39 are faced to the radiator 12 and the like by sandwiching. Here, the holding member 26 is the same as that shown in FIGS.
As shown in FIG.
8, 29, moldings 30, engagement pins 31, and the like.

Reference numeral 27 denotes a bracket serving as a base of the holding member 26, and the bracket 27 is formed by bending a rectangular plate body extending in the width direction (left and right directions) of the radiator 12. . And the bracket 27
As shown in FIG. 7, the base end side is integrally fixed to the radiator support base 4C with the bottom frame 14A of the frame body 14 using the above-mentioned bolts 13, and the tip end side is directed to the oil cooler 18 with respect to the flow direction of the cooling air. It extends diagonally upward to the upstream side of.

Reference numerals 28 and 29 denote a pair of insertion guides provided on the front end side of the bracket 27 so as to project upward.
Is formed by vertically bending the tip portion of the bracket 27 upward. On the other hand, the insertion guide 29
It is composed of a plate body having an L-shaped cross section, which is fixed to the upper surface of the bracket 27 by welding or the like. And each insertion guide 2
Reference numerals 8 and 29 extend parallel to each other along the width direction of the radiator 12 in a state of facing each other with a constant gap before and after the flow direction of the cooling air, and lower edge portions 37A of the dustproof net divisions 35 and 39 described later, It serves as a guide when inserting 41A so as to sandwich it.

, 30, are insertion guides 28, 29, respectively.
A plurality of malls attached to the upper edge of each
As shown in FIG. 12 and FIG. 13, etc., is formed in a U-shaped cross section by a soft material such as rubber or felt, and is attached to the upper edge portions of the insertion guides 28, 29 so as to cover them. .

Then, in each molding 30, the lower edge portions 37A and 41A of the dustproof net divisions 35 and 39 are inserted into the respective insertion guides 2.
These lower edge portions 37A, 4 when inserted between 8 and 29
By elastically supporting 1A, the dustproof net divisions 35 and 39 are prevented from fluttering due to the wind pressure of the cooling air.

Reference numerals 31 and 31 denote two engagement pins fixed to the upper edge portions of the insertion guides 28 and 29 by welding or the like, and the engagement pins 31 are provided between the insertion guides 28 and 29.
It extends along the flow direction of the cooling air. Then, each engagement pin 31 has a lower edge portion 37 of the dustproof net divided bodies 35, 39.
By engaging the later-described lower recessed grooves 37E and 41E formed in A and 41A, the dustproof net divided bodies 35 and 39 are
The positioning is performed with respect to the radiator 12 and the like.

A fixing member 32 is provided between the left and right side frames 14B and 14C of the frame body 14 so as to be separated upward from the holding member 26. The fixing member 32 is a dustproof net division body 35 described later. , 39 for fixing the upper edge portions 37B, 41B.

Here, the fixing member 32 is shown in FIGS.
As shown in FIG. 5, the bracket 33 is formed by bending an elongated plate body into a substantially U-shape and extends in the width direction of the radiator 12. Then, two fixing plates 33A, 33A, which are spaced apart in the left and right directions and extend in the upper and lower directions, are fixed to the bracket 33 by welding or the like. The upper end side of each fixing plate 33A has a butterfly bolt to be described later. A screw seat 33B to which 38 is screwed is provided.

The fixing member 32 is the same as the bolt 1 described above.
By attaching both end sides of the bracket 33 to the left and right side frames 14B and 14C of the frame body 14 by using 9, the support arm 20 is attached to the frame body 14 of the radiator 12,
Butterfly bolt 38 screwed to the screw seat 33B of the fixing plate 33A.
As a result, the upper edge portion 37 of each dustproof net divided body 35, 39
B and 41B are fixed.

Reference numeral 34 denotes a dustproof net provided upstream of the radiator 12 and the oil cooler 18 with respect to the flow direction of the cooling air. The dustproof net 34 is composed of first and second dustproof net split bodies 35, which will be described later. 39, the dust in the cooling air is captured, so that the dust is collected by the radiator 12
It is to prevent it from adhering to etc.

Reference numeral 35 designates a first dustproof net divided body which constitutes the dustproof net 34. The dustproof net divided body 35 is shown in FIG.
As shown in FIG.
7, and the dust in the cooling air is captured by the net 36.

Reference numeral 36 is a net forming the main body of the dustproof net divisional body 35. The net 36 is formed by weaving a wire material made of, for example, a metal material or a resin material into a rectangular shape extending upward and downward. There is. And the net 36
The size of the mesh is set so that the cooling air can pass without resistance.

Reference numeral 37 denotes a net support frame which is an outer frame of the dustproof net division body 35. The net support frame 37 is formed by, for example, bending a thin metal plate and sandwiching the outer peripheral edge portion of the net 36. It is formed in a rectangular frame shape that surrounds the outer circumference of 36 over the entire circumference.

The net support frame 37 is located on the lower side in the upper and lower directions (length direction) and extends in the left and right directions (width direction), and the lower edge portion 37A is positioned on the upper side in the upper and lower directions. The upper edge portion 37B extending in the left and right directions, and the left edge portion 3 located in the left end side of the lower edge portion 37A and the upper edge portion 37B and extending in the upper and lower directions.
7C and a right edge portion 37D which is located on the right end side of the lower edge portion 37A and the upper edge portion 37B and extends upward and downward.

Further, the lower edge portion 37A of the net support frame 37 is provided with a lower groove 37E having a long groove which is open at the lower end side and extends upward and downward, and the upper edge portion 37B is opened at the upper end side and is raised. , A downwardly extending long concave groove 37F is provided.

Here, the left side edge portion 37 of the net support frame 37
C is bent at a substantially right angle from the lower edge portion 37A and the upper edge portion 37B, so that the entire surface becomes a bent curved surface that is substantially orthogonal to the surface of the net 36, and the upstream side of the cooling air flow direction (radiator 12). (The direction away from)). Further, the right side edge portion 37D of the net support frame 37 is
By being bent at a substantially right angle from the lower edge portion 37A and the upper edge portion 37B, the entire surface becomes a bent curved surface that is substantially orthogonal to the surface of the net 36, and in the opposite direction to the left edge portion 37C, the flow direction of the cooling air flows. It is configured to project toward the downstream side.

On the other hand, the lower edge portion 37A of the net support frame 37
Is inserted between the insertion guides 28 and 29 of the holding member 26, and the lower groove 37E is engaged with the engaging pin 31 to be positioned leftward and rightward with respect to the holding member 26. ing. In addition, the upper edge portion 3 of the net support frame 37
7B is configured to be fixed to the fixing member 32 by screwing a wing bolt 38 inserted into the upper groove 37F to the fixing plate 33A of the fixing member 32.

Reference numeral 39 denotes a second dustproof net divisional body which constitutes the dustproof net 34 together with the first dustproof net divisional body 35.
Similar to the dustproof net division body 35, the dustproof net division body 39 is composed of a net 40 for capturing dust in the cooling air and a net support frame 41 surrounding the outer periphery of the net 40 over the entire circumference. ing.

The net support frame 41, like the net support frame 37 described above, has a lower edge portion 41A located on the lower side in the upper and lower directions and an upper edge portion 4 located on the upper side in the upper and lower directions.
1B, a left edge 41C located on the left end side of the lower edge 41A and the upper edge 41B, a lower edge 41A and an upper edge 41B.
And a right side edge portion 41D located on the right end side of the. Further, the lower edge portion 41A is provided with a lower groove 41E that engages with the engagement pin 31 of the holding member 26, and the upper edge portion 41A.
B has an upper concave groove 41F into which the butterfly bolt 38 is inserted.

Here, the left edge 41 of the net support frame 41
C is bent at a substantially right angle from the lower edge portion 41A and the upper edge portion 41B, so that the entire surface becomes a bent curved surface that is substantially orthogonal to the surface of the net 40, and is directed toward the downstream side in the flow direction of the cooling air. It is protruding. Further, the right side edge portion 41D of the net support frame 41 is bent almost at a right angle from the lower edge portion 41A and the upper edge portion 41B, so that the entire surface of the net 40 is bent.
Of the left side edge portion 41.
Contrary to C, it is configured to project toward the upstream side in the flow direction of the cooling air.

Then, each dustproof net divided body 35, 39
5, the left side edge portion 37C (folded curved surface) of the net support frame 37 and the net support frame 41 as shown in FIGS.
With the right edge portion 41D (folded curved surface) of each other abutting each other, they are arranged adjacent to each other on the left side and the right side in a state where they are flush with each other on the upstream side of the radiator 12 and the like. It is configured to be fixed at two places.

In this state, the adjacent dustproof net divisions 35
The left side edge portion 37C of the (net support frame 37) and the right side edge portion 41D of the dustproof net divisional body 39 (net support frame 41) are orthogonal to the surfaces of the nets 36 and 40, and extend in the flow direction of the cooling air. Project toward. And the dustproof net division body 3
At the butting positions of 5, 39, a narrow butting surface 42 having a narrow width corresponding to the wall thickness of the left edge portion 37C and the right edge portion 41D is formed. It is significantly smaller than the width dimension T of the wide butt surface 109 by the technology (t <T).

Further, the net support frame 37 is reinforced by the left and right side edge portions 37C and 37D in the flow direction of the cooling air, and the net support frame 41 is left and right side edge portions 41C and 37C.
Since it is reinforced by 41D with respect to the flow direction of the cooling air, the strength of the dustproof net divided bodies 35, 39 can be increased.

The heat exchange device 11 according to this embodiment has the above-mentioned structure, and its operation will be described below.

First, the engine 8 is operated and the cooling fan 2 is operated.
When 4 is rotationally driven, the outside air is sucked into the exterior cover 6 through the ventilation port 6A, and this outside air serves as cooling air and passes through the dustproof net 34, and the oil cooler 18 and the radiator 1
2 is supplied.

Then, the radiator 12 cools the engine cooling water by exchanging the heat of the engine cooling water circulating with the engine 8 in the cooling air by exchanging heat with the heat radiating portion 15. Further, the oil cooler 18 cools the hydraulic oil by exchanging the heat of the hydraulic oil flowing back from the hydraulic actuator to the hydraulic oil tank in the heat radiating section 21 and discharging it into the cooling air.

At this time, the dustproof net divisions 35, 39 arranged on the upstream side of the radiator 12 and the like capture the dust mixed in the cooling air by the nets 36, 40, and these dusts are collected by the radiator 12, the oil cooler. Suppresses adhesion to 18 etc.

In this case, as shown in FIG. 5 and FIG.
The left side edge portion 37C of the dustproof net division body 35 and the right side edge portion 41D of the dustproof net division body 39 which are adjacent to each other are the net 36,
Since it is orthogonal to the surface of 40 and projects toward the flow direction of the cooling air, the width dimension t of the narrow width butting surface 42 formed at the butting portion of each dustproof net divided body 35, 39 is suppressed to be small. be able to.

As a result, the two dustproof net division bodies 3
Even when 5 and 39 are arranged adjacent to each other on the left and right sides, it is possible to suppress the flow of the cooling air from being obstructed by the narrow butting surfaces 42 formed at the butting positions of the two, and the oil cooler 18, Sufficient cooling air can be supplied to the radiator 12, and the working oil, engine cooling water, etc. can be cooled efficiently.

Moreover, the net support frame 37 of the dustproof net divisional body 35 is reinforced in the flow direction of the cooling air by the left and right side edge portions 37C and 37D, and the dustproof net divisional body 3 is provided.
The net support frame 41 of 9 has left and right side edge portions 41C, 41
Since it is reinforced by D in the flow direction of the cooling air, it is possible to increase the strength of the dustproof net divided bodies 35 and 39.

As a result, the dustproof net divisions 35 and 39 are not bent by the wind pressure of the cooling air, and the flaps of the dustproof net divisions 35 and 39 can be suppressed.
Further, it is possible to prevent the dustproof net divisions 35, 39 from being inadvertently deformed when the dustproof net divisions 35, 39 are attached, detached, or washed, and the like. It is possible to contribute to the improvement of workability such as mounting, removing, and cleaning of 35 and 39.

Further, in the present embodiment, the left side edge portion 3 of the net support frame 37 which constitutes the dustproof net division body 35.
7C and the right side edge portion 37D are both bent curved surfaces, and both the left side edge portion 41C and the right side edge portion 41D of the net support frame 41 forming the dustproof net divided body 39 are bent curved surface.

As a result, each dustproof net division 35, 3
When 9 is arranged adjacent to the upstream side of the radiator 12, for example, even if the left and right positional relationships of the dustproof net divided bodies 35 and 39 are reversed from the positional relationship shown in FIG. The right edge portion 37D of the divided body 35 (net support frame 37) and the dustproof net divided body 39 (net support frame 4)
Since the left edge 41C of 1) can be abutted against each other, the dustproof net divisions 35, 39 can be easily attached and the workability at the time of attachment can be improved.

In the above-described embodiment, the left edge portion 37C and the right edge portion 37D of the dustproof net division 35 (net support frame 37) are bent in directions opposite to each other with respect to the flow direction of the cooling air. An example is given in which the left edge 41C and the right edge 41D of the dustproof net split body 39 (net support frame 41) are bent in mutually opposite directions with respect to the flow direction of the cooling air. However, the present invention is not limited to this, and the left edge portion 37C and the right edge portion 37D 'of the dustproof net divided body 35' (net support frame 37 ') are the same as in the modification shown in FIG. 14, for example. The left side edge portion 41C 'of the dustproof net division body 39' (net support frame 41 ')
The right edge portion 41D and the right edge portion 41D may be bent in the same direction.

Further, in the above-mentioned embodiment, the structure in which the lower edge portions 37A and 41A of the dustproof net divided bodies 35 and 39 are sandwiched between the insertion guides 28 and 29 provided on the sandwiching member 26 is taken as an example. There is. However, the present invention is not limited to this. For example, as in another modification shown in FIG. 15, a bracket 43 having two female screw holes 43A and 43A screwed on the tip side is attached to the radiator support base 4C. , The female screw hole 43A of the bracket 43, the dustproof net divided body 3
Butterfly bolt 3 inserted in the lower groove 37E, 41E of 5, 39
8 may be screwed.

Further, in the above-described embodiment, the case where the dustproof net is constituted by the two dustproof net divided bodies 35 and 39 is taken as an example. However, the present invention is not limited to this, and the dustproof net may be configured by, for example, three or more dustproof net divided bodies.

Further, in the above-described embodiment, the case where the suction type cooling fan 24 for sucking the outside air into the exterior cover 6 is used as an example, but the present invention is not limited to this, and the inside of the exterior cover 6 is not limited to this. A discharge-type cooling fan that discharges air to the outside may be used.

Further, in the above-mentioned embodiments, the hydraulic excavator was described as an example of the construction machine, but the present invention is not limited to this, and other construction machines such as a wheel loader, a hydraulic crane, a bulldozer, etc. May be applied to.

[0076]

As described in detail above, according to the first aspect of the invention, the net supporting frames forming the dustproof net divided body extend at adjacent butting positions substantially orthogonal to the surface of the net. It is configured to have a bent surface. For this reason,
The folding surface provided on the net support frame of each dustproof net division is
Since they extend in the flow direction of the cooling air in a state of abutting each other, when multiple dustproof net divisions are arranged adjacent to each other on the upstream side of the heat exchanger, the net support frame of each of these dustproof net divisions cools. It is possible to suppress the obstruction of the wind flow. As a result, sufficient cooling air can be supplied to the heat exchanger, and engine cooling water, hydraulic oil, etc. can be efficiently cooled.

On the other hand, since the bent curved surface of the net support frame is bent in a direction substantially orthogonal to the surface of the net,
The bent surface can reinforce the net support frame. As a result, the strength of the dustproof net divisional body in the flow direction of the cooling air can be increased, and the dustproof net divisional body can be prevented from fluttering due to the wind pressure of the cooling air and deformation of the dustproof net divisional body at the time of cleaning work. .

Further, according to the invention of claim 2, the net support frame is formed in a rectangular shape surrounded by the lower edge portion, the upper edge portion and the left and right side edge portions, and the folding curved surfaces are left and right. It is configured to be provided on the side edge portion of. As a result, when a plurality of dustproof net divisions are arranged adjacent to each other on the left and right sides, the left edge and the right side of the net support frame are irrespective of the positional relationship between the left and right dustproof net divisions. Since the folded curved surfaces provided on the edge portion can be reliably abutted against each other, the workability when mounting each dustproof net divided body can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a hydraulic excavator to which a heat exchange device according to an embodiment of the present invention is applied, with a working device removed.

FIG. 2 is a plan view of the hydraulic excavator as viewed in the direction of arrows II-II in FIG.

FIG. 3 is a rear view of the hydraulic excavator as seen from the direction of arrows III-III in FIG.

FIG. 4 is an enlarged front view showing the heat exchange device in FIG.

5 is a plan view of a radiator, an oil cooler, a dustproof net divisional body, etc., which is enlarged from the direction of the arrow VV in FIG. 4. FIG.

FIG. 6 is a rear view of a radiator, an oil cooler, a dustproof net dividing body, and the like as viewed in the direction of arrows VI-VI in FIG.

FIG. 7 is a rear view showing a state in which a fixing member and a sandwiching member are attached to the radiator in FIG.

FIG. 8 is an exploded perspective view showing a state in which the dustproof net divided body is mounted on the upstream side of the radiator.

FIG. 9 is a perspective view showing a sandwiching member alone.

FIG. 10 is a perspective view showing each dustproof net divided body as a single body.

FIG. 11 is an enlarged view of a main part showing the holding member, the molding, the engagement pin, the dustproof net divided body, and the like in FIG. 4 in an enlarged manner.

FIG. 12 is an enlarged cross-sectional view of a holding member, a molding, a dustproof net divided body, etc., as seen from the direction of arrow XII-XII in FIG. 11.

13 is an enlarged cross-sectional view of a holding member, an engagement pin, a dustproof net divided body, a lower groove, etc. as viewed in the direction of arrows XIII-XIII in FIG.

FIG. 14 is a perspective view similar to FIG. 10 showing a modified example of each dustproof net divided body.

FIG. 15 is an exploded perspective view similar to FIG. 8, showing a modified example of the structure for fixing the lower edge portion of the dustproof net divided body.

FIG. 16 is a perspective view showing a dustproof net division body and the like according to a conventional technique.

[Explanation of symbols]

8 Engine 11 Heat Exchanger 12 Radiator (Heat Exchanger) 18 Oil Cooler (Heat Exchanger) 24 Cooling Fan 34 Dustproof Nets 35, 39, 35 ', 39' Dustproof Net Split Body (Dustproof Net) 36, 40 Net 37, 41, 37 ', 41' Net support frame 37A, 41A Lower edge 37B, 41B Upper edge 37C, 41C, 41C 'Left edge (folded curved surface) 37D, 41D, 37D' Right edge (folded curved surface)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shingo Kishimoto             1-2, Sasagaoka, Mizuguchi Town, Koga District, Shiga Prefecture             Hitachi Construction Machinery Tierra Shiga Factory F-term (reference) 3L065 AA05 FA30

Claims (2)

[Claims] 1. A heat exchanger mounted on a frame constituting a construction machine for cooling a heated liquid; a cooling fan provided facing the heat exchanger to supply cooling air to the heat exchanger; A dustproof net formed of a plurality of divided dustproof nets, which are provided on the upstream side of the heat exchanger in the middle of the flow of cooling air by the cooling fan so as to face each other and are arranged adjacent to each other on the same plane. In the heat exchange device for a construction machine, each dustproof net divided body forming the dustproof net is a net that faces the heat exchanger and captures dust in cooling air,
And a net support frame surrounding the outer circumference of the net, and the net support frame is provided with a bent curved surface extending substantially perpendicular to the surface of the net at the abutting position of the adjacent dustproof net divided bodies. A heat exchange device for construction machinery. 2. The net support frame is located at a lower side in the upper and lower directions and extends in the left and right directions, and an upper edge section in the upper and lower directions and extends in the left and right directions. And the left and right side edges of the lower edge portion and the upper edge portion, which are located on both left and right sides, and are surrounded by the left and right side edge portions extending in the upper and lower directions. The heat exchange device for a construction machine according to claim 1, wherein the heat exchange device is provided on a left edge portion and a right edge portion of the net support frame.