JP2000337144A - Heat exchanger for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently supply the cooling air without generating damage in a tank provided on or under a frame body by a cooling fan fitting member. SOLUTION: In a heat exchanger 20 provided with an upper tank 23 and a lower tank 24 on and under a heat exchange part, a beam 34 is provided between a pair of connecting members 29 in right and left overhung from the lower tank 24. A fitting member 33 is fixed to the beam 34, and a cooling fan 30 is installed in the fitting member 33 at two positions in upper and lower, and a first arm 36a is extended in a direction crossing the fitting member 33 at each installation position of respective cooling fans 30, and a second arm 36b is fitted to both ends of a frame body 21 at two positions in upper and lower. Other ends of the first and the second arms 36a, 36b are connected for fixation. A shroud 31 is fixed to the frame body 21 forming the heat exchange part 22 of the heat exchanger 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger mounted on construction equipment such as a radiator or an oil cooler.

[0002]

2. Description of the Related Art As an example of a construction machine, for example, a hydraulic shovel is provided with an upper revolving body rotatably mounted on a lower traveling body, and an excavating work machine provided on the upper revolving body.
The traveling of the lower traveling body and the turning of the upper revolving superstructure are each driven by a hydraulic motor, and the excavator is driven by a hydraulic cylinder. These hydraulic motors and hydraulic cylinders are hydraulic actuators, and these hydraulic actuators are driven by pressure oil supplied from a hydraulic pump. The hydraulic pump is driven to rotate by the engine.

Accordingly, in a hydraulic shovel, pressure oil pressurized by a hydraulic pump from a hydraulic oil tank is supplied to various hydraulic actuators, and then returns to the hydraulic oil tank. It will be heated. Therefore, an oil cooler is provided to cool the return oil returning from the hydraulic actuator to the hydraulic oil tank. Further, a radiator for cooling an engine that drives the hydraulic pump is provided. These oil coolers and radiators are heat exchange devices, and the fluid to be cooled is:
The oil cooler is hydraulic oil, and the radiator is engine cooling water. As described above, although the fluids to be cooled are different, such as the working oil and the engine cooling water, the cooling methods for these fluids to be cooled are substantially the same. In other words, a number of tubes through which the fluid to be cooled flows are provided in the vertical direction, and a heat exchange unit provided by radiating fins between these tubes;
A heat exchanger with an inlet and an outlet for the fluid to be cooled,
And a cooling fan for supplying cooling air to the heat exchange section. The cooling air from the cooling fan is supplied to the heat exchanging section while the heated cooling fluid flows through the tube, so that heat is exchanged between the cooling fluid and the cooling wind.

Here, as a specific configuration of the heat exchange device, for example, those shown in FIGS. 4 to 6 are conventionally known. 4 and 5, reference numeral 1 denotes a heat exchanger. As shown in FIG. 6, the heat exchanger 1 is provided with a large number of tubes 3 on a frame 2 in a vertical direction. A large number of radiating fins 4 made of a thin metal plate or the like having a high thermal conductivity are provided in a direction orthogonal to each of the tubes 3. The tube 3 is provided so as to penetrate while being in contact with the radiation fin 4. The tube 3 penetrates the top and bottom of the frame 2 and is fixed by means such as welding. Thereby, the heat exchange unit 5 is configured.

An upper tank 6 and a lower tank 7 are fixedly provided above and below the frame 2 constituting the heat exchange section 5, and the upper end of the tube 3 communicates with the upper tank 6, and the lower end communicates with the lower tank 7, respectively. I have. A supply pipe for the fluid to be cooled is provided in the upper tank 6, and a lower tank 7 is provided.
Is connected to a cooling fluid outlet pipe (both not shown). Therefore, it is supplied to the upper tank 6,
The fluid to be cooled, which is in a heated state, comes into contact with the cooling air while descending in the tube 3, cools to a predetermined temperature, and then flows into the lower tank 7.

A cooling air is circulated through the heat exchanging section 5, and a cooling fan 8 is used for this purpose. The cooling fan 8 is driven to rotate by a hydraulic motor 9. The rotating shaft of the cooling fan 8 and the hydraulic motor 9 are mounted on a metal plate provided so as to bridge between the upper tank 6 and the lower tank 7. It is attached to the member 10. Here, the configuration of the connecting portion of the mounting member 10 to the upper tank 6 and the lower tank 7 is as apparent from FIG. FIG. 6 shows a structure for mounting the mounting member 10 to the lower tank 7, but the structure for mounting the mounting member 10 to the upper tank 6 is also substantially the same. As shown in the drawing, a screw seat 11 is fixedly provided on the wall surface of the lower tank 7 by welding means, and the screw seat 11 is brought into contact with the upper end of the mounting member 10 so as to abut.
A plurality of screws 12 are used for fixing.

Further, a shroud 13 is connected to the frame 2 in order to increase the air blowing efficiency of the cooling fan 8. The shroud 13 has an opening 13 a having a radius slightly larger than the rotation radius of the cooling fan 8. Has been established. In the illustrated heat exchange device, the heat exchange efficiency of the fluid to be cooled flowing through the tube 3 is improved by increasing the entire length of the tube 3.
For this purpose, the heat exchange section 5 is made vertically long, and the mounting members 10 are provided with cooling fans 8 at two upper and lower positions.

As described above, the heat exchanger 1 and the cooling fan 8 are unitized to constitute a heat exchange device. This heat exchange device is installed on the frame 14 of the upper swing body of the hydraulic shovel. It has become. However, since the hydraulic excavator vibrates greatly during operation, in order to minimize the transmission of this vibration to the heat exchange device, the lower tank 7 constituting the lower end thereof is not directly fixed to the frame. Plates 15a and 15b are provided on the upper and lower sides of the frame 14, and an anti-vibration support 1 is provided between the plate 15a and the frame 14 and between the frame 14 and the plate 15b with anti-vibration rubber 15c interposed therebetween.
5 is fixedly installed.

[0009]

By the way, when an excavator is operated to perform an operation such as excavation of earth and sand, the entire vehicle vibrates greatly, and the heat exchanger is supported by the vibration isolating support. However, considerable vibration is also transmitted to the heat exchange device. The strength member in the heat exchanger is a rectangular frame made of a long metal plate having a predetermined width, and the frame is vertically elongated, and a heavy upper tank is mounted on the upper end thereof. . Therefore, the vibration during the operation of the hydraulic shovel causes the frame to swing or deform back and forth, right and left, and the upper tank side swings greatly. On the other hand, since the lower tank is installed directly on the anti-vibration support table, the lower tank does not move so much even if the upper swing body vibrates. That is, during the operation of the hydraulic shovel, a relative displacement always occurs between the upper tank and the lower tank. However, the mounting members are connected so as to bridge between these two tanks, so that when the vehicle vibrates, the frame, the upper tank, the lower tank, and the mounting members move apart. As a result, a large load repeatedly acts on the mounting part of the screw seat to the lower tank and upper tank,
There is a possibility that cracks may occur on the tank wall due to metal fatigue.

[0010] In order to protect the tank, it is conceivable to provide a structure in which a mounting member for the cooling fan is provided independently of the heat exchanger. However, a shroud is provided in the heat exchanger, and the shroud is provided to increase the efficiency of blowing the cooling air. From the viewpoint of the efficiency of the cooling air, the cooling fan is substantially spaced from the opening formed in the shroud. It is desirable to mount it without any. Therefore, if the cooling fan is configured to be supported separately from the heat exchanger, when the upper swing body vibrates, the heat exchanger and the cooling fan mounted on the mounting member move separately, and the blades of the cooling fan are moved. May collide with shroud. Therefore, in order to avoid such a situation, it is necessary to enlarge the opening formed in the shroud so as not to interfere with the cooling fan. Then, there is a problem that the air blowing efficiency by the cooling fan is reduced.

The present invention has been made in view of the above points, and an object of the present invention is to provide a construction capable of efficiently supplying cooling air without causing damage to a tank or the like. An object of the present invention is to provide a heat exchange device for a machine.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a multi-tube system in which a fluid to be cooled flows through a frame mounted on a frame of a construction machine via an anti-vibration support. A heat exchange section provided with a radiation fin provided between the tubes, an upper tank and a lower tank fixedly provided above and below the frame, and a heat exchanger configured to face the heat exchange section. A heat exchanger for a construction machine including one or a plurality of cooling fans provided, wherein a beam is provided in connection with the anti-vibration support table, and an attachment member for mounting the cooling fan is provided on the beam, and One or more connecting arms are connected to the mounting member, and both ends of the connecting arm are connected and fixed to both sides of the frame.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 shows a front view of the heat exchanger, FIG. 2 shows a side view, and FIG. 3 shows a cooling fan mounting structure.

First, in FIGS. 1 and 2, reference numeral 20 denotes a heat exchanger. The heat exchanger 20 includes a vertically long rectangular frame 21 as described in the prior art. 22 and an upper tank 23 provided on an upper part of a frame body 21 constituting the heat exchange part 22 and a lower tank 24 connected to a lower part thereof. Further, the heat exchange section 22 is provided with a large number of tubes 25 in the vertical direction and a large number of radiating fins 26 in a direction perpendicular to the tube 25, as in the prior art. The heat exchanger 20 is installed on a vibration isolating support 28 on a frame 27 of an upper swing body of the hydraulic excavator, thereby suppressing transmission of vibration to the heat exchanger 20.

Here, the heat exchanger 20 is attached to the vibration isolating support 28 by connecting a connecting member 29 formed in a substantially U-shape to a front and rear wall surface of the lower tank 24 at a predetermined distance.
Are fixedly provided by welding or the like.
Is fixed on the vibration-proof support 28 with screws or the like. Here, the connecting member 29 is attached such that the rising portions on both sides thereof face upward.

Reference numeral 30 denotes a cooling fan, and 31 denotes a shroud. The cooling fans 30 are provided at two locations above and below, and each is driven to rotate by a hydraulic motor 32. The upper and lower two cooling fans 30 are attached to the attachment member 33. The number of cooling fans mounted on the mounting member 33 is not limited to two. The mounting member 33 is formed by bending the left and right ends of the metal plate in the same direction by approximately 90 °, and the bending direction is opposite to the heat exchanger 20. Mounting member 33
Is formed in this way, the strength against the force in the bending direction is increased.

As shown in FIG. 3, in order to fix the heat exchanger 20 to the vibration isolating support 28, a beam 3 is provided between a pair of right and left connecting members 29 projecting from the lower tank 24.
The mounting member 33 to which the cooling fan 30 is mounted is fixed to the beam 34. Here, the beam 34 has a U-shaped cross section, and is mounted so that the rising portions on both sides thereof face downward. The mounting member 33 is provided on a connecting portion between the rising portions of the beam 34. It is fixed to the plate 35 by means such as screws or welding.

The mounting members 3 are located at the two upper and lower mounting positions of the cooling fan 30 on the mounting member 33.
The first arm 36a extends in a direction orthogonal to 3, that is, in the left-right direction of the heat exchanger 20. For this purpose, two connecting plate pieces 33a are provided on each side of the mounting member 33 in the vertical direction, and the first arm 36a is fixed to these connecting plate pieces 33a by means such as screws. On the other hand, on both sides of the frame body 21, second arms 36b are attached at upper and lower positions by means of screwing, welding, or the like. The other ends of the first and second arms 36a, 36b are provided. Are connected and fixed to each other by means such as screwing. Therefore, these first and second arms 36a, 36b
Thus, a connection arm 36 that connects between the mounting position of each cooling fan 30 of the mounting member 33 and the frame 21 that forms the heat exchange part of the heat exchanger 20 is configured.

The shroud 31 is fixed to the frame 21 constituting the heat exchange section 22 of the heat exchanger 20 by means of screws or the like, and swells toward the mounting section of the cooling fan 30. Two circular openings 31 a having a radius slightly larger than the rotation radius of the cooling fan 30 are formed in the upper and lower portions of the shroud 31 at positions facing the cooling fan 30. Most parts of each cooling fan 30 extend into the shroud 31 through these openings 31a. Here, shroud 31
The opening 31a is formed to take in the cooling air, and a part of the mounting member 33 and the first arm 36a are formed in the opening 31 where the cooling air flows to the heat exchanger 20.
a, a plurality of through-holes 37 are formed in the mounting member 33 in the up-down direction to minimize the flow of the cooling air, and the first arm 36a A similar through hole 37 is also formed.

In the above configuration, when the cooling fan 30 is operated, cooling air is sent into the inside of the frame 21 constituting the heat exchange section 22 of the heat exchanger 20. Therefore,
While the fluid to be cooled, for example, engine cooling water or hydraulic oil, flows from the upper tank 23 through the tube 25 toward the lower tank 24, the fluid to be cooled is cooled to a predetermined temperature.

Since the heat exchanging device is installed on a construction machine such as a hydraulic shovel or the like, when excavating earth and sand or performing other operations, the frame 2 on which the heat exchanging device is mounted is used.
7 will vibrate greatly. However, the attachment member 33 to which the cooling fan 30 is attached is fixed to the lower tank 2 to fix the heat exchanger 20 to the vibration isolating support 28.
The upper tank 23 is erected between the left and right connecting members 29, 29, which are connected to the upper tank 23 and the lower tank 24. Of the wall and the like based on the difference between the movement of the lower tank 24 and the lower tank 24 can be prevented.

The first and second arms 36a, 36b are provided between the mounting member 33 and the frame 21 at a position where the cooling fan 30 is mounted.
36b.
That is, the connecting arm 36 provided so as to bridge the left and right of the frame 21 constituting the structure of the heat exchange unit 22 in the heat exchanger 20 functions as two upper and lower beam members, and these two beam members are used. Since the intermediate portion of the member is connected to the attachment member 33 functioning as a column member, the deformation of the frame body 21 when the frame 24 vibrates can be suppressed. As a result, the tubes 25 connected to the top and bottom of the frame 21
There is no risk of breakage. In particular, in the case where the frame 21 is formed in a vertically long rectangular shape and the cooling fan 30 is provided in two upper and lower stages in order to increase the distance between the upper tank 23 and the lower tank 24 to increase the overall length of the tube 25. If no reinforcement is applied to the frame 21, the frame 21 is greatly deformed by the vibration of the frame 27. In this way, the two beam members are connected to the frame 21 and By supporting the intermediate portion of the beam member with the column member, the shape retention of the frame 21 is extremely high.

Further, the mounting member 33 to which the cooling fan 30 is mounted and the frame 21 to which the shroud 31 is connected are connected via a connecting arm 36 and installed on the same vibration-proof support 28. Frame 2
7, the cooling fan 30 and the shroud 3
No deviation occurs in the relative positional relationship between the two. Therefore, even if the diameter difference between the rotation radius of the cooling fan 30 and the radius of the opening 31 a of the shroud 31 is minimized, there is no possibility that the cooling fan 30 will contact the shroud 31. As described above, when the diameter difference between the cooling fan 30 and the opening 31a of the shroud 31 is minimized, the amount of cooling air supplied to the heat exchanger 20 increases, and the cooling efficiency of the fluid to be cooled is further increased. Can be.

[0024]

Since the present invention is constructed as described above, it does not cause damage to tanks and the like provided above and below the frame by the mounting member of the cooling fan, and can supply the cooling air efficiently. Has the effect of

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchange device showing one embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is an exploded perspective view of the heat exchange device with a cooling fan omitted.

FIG. 4 is a front view of a conventional heat exchange device.

FIG. 5 is a right side view of FIG.

FIG. 6 is a sectional view taken along line XX of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Heat exchanger 21 Frame 22 Heat exchange part 23 Upper tank 24 Lower tank 25 Tube 26 Radiation fin 27 Frame 28 Anti-vibration support base 30 Cooling fan 31 Shroud 33 Mounting member 34 Beam 35 Base plate 36 Connecting arm 36a First arm 36b 2 arms

Claims (2)

[Claims] 1. A heat exchange unit provided with a plurality of tubes through which a fluid to be cooled flows in a frame mounted on a frame of a construction machine via a vibration isolation support, and radiating fins provided between the tubes. A heat exchanger configured by an upper tank and a lower tank fixedly provided above and below the frame, and one or a plurality of cooling fans provided to face the heat exchange unit. ,
A beam is provided in connection with the anti-vibration support table, and a mounting member for mounting the cooling fan is provided upright on the beam,
A heat exchanger for a construction machine, wherein one or more connecting arms are connected to the mounting member, and both ends of the connecting arm are connected and fixed to both sides of the frame. 2. A structure in which the cooling fan is mounted on the mounting member at two locations vertically, and the connecting arm is connected to the mounting member at or near a mounting portion of each of the cooling fans. The heat exchange device for a construction machine according to claim 1, wherein: