JP2001323506A - Heat exchanging device for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separately extract the heat exchanger from the unit of a heat exchanging device for easily conducting cleaning and other maintenance works efficiently in the first heat exchanger at a position oppositely arranged to a cooling fan. SOLUTION: A radiator 10, an oil cooler 11 and an intercooler 12 are disposed from the side near to a front end wall 14, from which the cooling fan is faced to a shroud 13. Upper and lower partition walls 16, 17 are installed between the front end wall 14 and the radiator 10 in the wall 14, and these partition walls are fixed detachably to each front end wall 14 by screwing. An outflow-side piping connecting section 25 and a drain cock 26 are projected towards the front end wall 14 side from a lower tank 21 for the radiator 10, but projecting length is made shorter than a space between the radiator 10 and the front end wall 14.

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 installed in a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art As a construction machine, for example, an engine is mounted on a hydraulic shovel, and a hydraulic pump is driven by the engine, and hydraulic actuators provided at respective working parts are driven by hydraulic oil supplied from the hydraulic pump. It is configured to be driven. For this reason, some excavators are provided with at least a radiator and an oil cooler, and when an engine with a turbocharger is used, some excavators are also provided with an intercooler for cooling air compressed by the turbocharger. These radiators, oil coolers and intercoolers are heat exchangers and therefore have tanks on the inflow and outflow sides of the fluid to be cooled,
A heat radiating portion provided between these two tanks is provided. The cooling fluid is passed through the heat radiating portions of the heat exchangers to cool the fluid to be cooled passing through the heat radiating portions. A plurality of such heat exchangers are arranged in series, a cooling fan is arranged at one end side, and by rotating this cooling fan, cooling air is sequentially circulated to the heat radiating portion of each heat exchanger. Is known, for example, from Japanese Patent Application Laid-Open No. 10-103065.

FIG. 4 shows a schematic configuration of a conventionally known heat exchange device. In the figure, 1 is an engine, 2 is a cooling fan, 3 is a radiator, 4 is an oil cooler, and 5 is an intercooler. The radiator 3, the oil cooler 4 and the intercooler 5 are all heat exchangers, but the radiator 3 is engine cooling water, the oil cooler 4 is hydraulic oil,
Are different fluids to be cooled, such as supercharged air supplied to the engine 1. However, it is composed of an inflow-side tank into which the fluid to be cooled flows, an outflow-side tank from which the cooled fluid flows out, and a radiator provided between the two tanks. And a heat radiation fin attached to the thin tube.

The radiator 3 and the oil cooler 4 are provided with an inflow-side tank at an upper portion and an outflow-side tank at a lower portion. On the other hand, since the intercooler 5 has a differential pressure between the inflow side and the outflow side, it is not always necessary to arrange both tanks vertically, and the inflow and outflow side tanks are provided at both left and right positions. General. Further, the size of each of the above-described heat exchangers mainly depends on the area of the radiator. The area of the radiator mainly depends on the flow rate of the fluid to be cooled. The radiator 3 and the oil cooler 4 usually have substantially the same size.
Generally, the area of the heat radiating portion of the intercooler 5 is about half of the area of the heat radiating portion of the radiator 3 and the oil cooler 4. Therefore, in the illustrated heat exchange device,
The intercooler 5 covers almost the upper half of the oil cooler 4. In some cases, the radiator 3 and the oil cooler 4 are provided with a certain difference in the area of the radiator. However, in this case, the radiator 3 generally reduces the area of the radiator.

[0005] In the heat exchange apparatus configured as described above, the cooling fan 2 is driven by the engine 1, takes in outside air from an outside air intake port 7 formed in a cover 6 constituting an engine room, and cools in the direction of an arrow. To be distributed. Therefore, the cooling fan 2 is configured as a suction fan. The cooling fan is not limited to one driven directly by the engine, and may be driven by a hydraulic pump or the like. Further, it may be configured as a fan for blowing instead of a suction fan.

In any case, the radiator 3, the oil cooler 4 and the intercooler 5, which constitute the heat exchanger, are arranged in series, and the radiator 3, the radiator 3,
The oil cooler 4 and the intercooler 5 are arranged in this order. Therefore, by rotating the cooling fan 2, the cooling air taken in from the outside air intake 7 is:
First, it passes through the heat radiating portion of the intercooler 5, then passes through the heat radiating portion of the oil cooler 4, and further passes through the heat radiating portion of the radiator 3. Further, a shroud 8 is provided in the heat radiating portion of each of the three heat exchangers arranged in series to reliably and efficiently pass the cooling air, and the shroud 8 constitutes a passage of the cooling air. . In order to allow as much cooling air as possible to pass through this passage, the shroud 8 is provided at the front end wall covering the periphery of the cooling fan 2 and at least on the left and right sides of the front end wall, at least up to the position of the oil cooler 4, and preferably the position of the intercooler 5. And between the front end wall and the radiator 3 and the radiator 3
The oil cooler 4 is provided with partitions provided at upper and lower intervals, and more preferably, the partition is also provided between the oil cooler 4 and the intercooler 5 on the upper and lower sides or on the upper side.

[0007]

As described above, the heat radiating portion of the heat exchanger is constituted by attaching a radiating fin to a thin tube through which the fluid to be cooled flows. For efficient heat exchange, it is necessary to increase the number of thin tubes and increase the heat radiation area of the heat radiation fins. Then, in the heat radiating portion, the flow path of the cooling air is finely divided. For this,
Dust and foreign matter conveyed by the cooling wind will adhere to the surface of the thin tubes and the radiating fins, impeding ventilation,
Further, the heat exchange efficiency is reduced. Therefore, the heat exchanger must be cleaned periodically and as needed to remove dust and foreign matter.

As is apparent from FIG. 4, the intercooler 5 located on the most upstream side in the flow direction of the cooling air can be cleaned from the front side. Further, since at least the lower position of the oil cooler 4 is also exposed, it can be easily cleaned to some extent. However, since the radiator 3 has the oil cooler 4 and the front end walls of the shroud 8 and the cooling fan 2 arranged on both sides, it is extremely difficult to clean the radiator 3.

From the above, for example, the upper partition between the radiator 3 and the oil cooler 4 is removed, and an air jet nozzle is inserted into a gap between the radiator 3 and the oil cooler 4. In general, dust and foreign matter adhering to the heat radiating portion are removed by spraying the heat toward the heat radiating portion. However, with such a cleaning method, the work efficiency is poor, and it is not always possible to completely clean the work. Moreover, this work is partially groped, for example, because the work is substantially fumbled. There is such a problem.
Further, in addition to cleaning, it may be necessary to perform repairs, replace parts, and the like. In this case, the maintenance work cannot be performed unless the entire unit of the heat exchange device is disassembled.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended to easily and efficiently perform cleaning and other maintenance work on a first heat exchanger located at a position facing a cooling fan. An object of the present invention is to make it possible to take out the first heat exchanger alone from a unit of the heat exchanger.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a plurality of heat exchangers arranged in series, a cooling fan provided at one end thereof, and a cooling fan. And a shroud that defines a passage for cooling air passing through the heat radiating portion of each heat exchanger, wherein the shroud has a front end wall provided with an opening facing the cooling fan. A first heat exchanger provided in connection with the front end wall and extending at a position facing at least the front end wall and the cooling fan, the side wall projecting in a direction along a side portion of each of the heat exchangers; And upper and lower partitions that cover upper and lower spaces between the first and second heat exchangers. The upper and lower partitions are detachably attached to the front end wall, and are located at a lower position of the first heat exchanger. Connect the pipe connection to the cooling fan side The length of the pipe connection is made shorter than the distance between the first heat exchanger and the front end wall, and the lower end of the first heat exchanger is attached to and detached from the support member. The feature is that it is configured to be attached as possible.

Here, the upper and lower partitions may be detachably fixed to the first heat exchanger side, or may be detachably fixed to the first heat exchanger and the front end wall of the shroud. However, it is desirable that the upper and lower partition walls be screwed to the front end wall and held in a non-fixed state with respect to the first heat exchanger, from the viewpoint of easy attachment and detachment operation.

The first heat exchanger may be an oil cooler or the like, but is preferably a radiator in which the fluid to be cooled is engine cooling water. The radiator includes an upper tank provided with an engine cooling water inflow pipe connection at an upper part, a lower tank provided with an engine cooling water outflow pipe connection at a lower part, and a radiator between the upper tank and the lower tank. However, in this case, the length of the protrusion protruding toward the front end wall is restricted by the outflow pipe connection portion provided in the lower tank. Also, in the lower tank,
Further, when the drain plug of the engine cooling water is provided so as to protrude in the same direction as the outflow pipe connection portion, the projecting length of the drain plug is also shorter than the distance between the radiator and the front end wall of the shroud. . In the case of the above configuration, at least an oil cooler is arranged as another heat exchanger at a position opposite to a side of the radiator facing the cooling fan.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of the heat exchange device. This heat exchange device includes a radiator 10, an oil cooler 11, and an intercooler 12, as described in the related art. It is integrated by the shroud 13 to be formed to constitute a heat exchange unit. The shroud 13 is a front end wall 1 provided with a circular opening 14a facing a cooling fan (not shown).
4 and left and right side walls 15, 15, which extend at least to the position of the oil cooler 11, preferably to the position of the intercooler 12.

Here, the cooling fan is constituted by a suction fan similar to that of the prior art, and a radiator 10 is disposed at a position closest to the cooling fan, and the radiator 10 is mounted on a front end wall 14 facing the cooling fan. A predetermined interval is provided. Also, the radiator 10 and the oil cooler 1
1 and between the oil cooler 11 and the intercooler 12. Here, it is not necessary to actively provide a gap between the three heat exchangers described above,
Some clearance is created between each heat exchanger to allow for assembly, disassembly, and the like. When outside air enters through this gap, the amount of air suction from the front side decreases,
The heat exchange efficiency of the heat exchanger as a whole decreases. Therefore, the upper and lower gaps between the oil cooler 11, the radiator 10, and the intercooler 12 are covered with a closing plate (not shown) fixedly connected between left and right side walls 15, 15 of the shroud 13, for example. Note that these gaps need not necessarily be closed as long as they are negligible.

On the other hand, between the radiator 10 and the cooling fan, that is, the front end wall 1 of the radiator 10 and the shroud 13
4 is essential. A predetermined space between the front end wall 14 and the radiator 10 has a negative pressure when the cooling fan is operated, and when the space has a negative pressure, the outside air can be sucked. In other words, a space is required between the front end wall 14 and the radiator 10 for a chamber with a negative pressure, and the upper and lower parts of the space provided must be closed. An upper partition 16 and a lower partition 17 are provided to close portions above and below this interval. These upper partition 16 and lower partition 1
7 is screwed to the front end wall 14 on the surface facing the radiator 10, so that the upper partition 16 and the lower partition 17 are detachable. Here, the upper and lower partition walls 16 and 17 exhibit a function of defining and forming a passage for the cooling air, and therefore also constitute a part of the shroud 13.

As described above, the upper and lower partition walls 16 and 17 constituting a part of the shroud 13 are detachable because the radiator 1 is provided by a unitized heat exchanger.
This is to enable 0 to be taken out alone. And
The direction in which the radiator 10 is taken out is such that the radiator 10 is taken out upward as indicated by the arrow in FIG.

FIG. 2 shows the configuration of the radiator 10. The radiator 10 includes an upper tank 20 provided at an upper position,
It is composed of a lower tank 21 provided at a lower position and a heat radiating section 22 provided therebetween. The upper tank 20 is provided with an inflow-side pipe connection portion 23 to which an inflow pipe for engine cooling water is detachably connected, and a pressure cap 24 also serving as a cooling water injection plug. In addition, lower tank 2
1, two outflow-side pipe connection portions 25 to which an outflow pipe of engine cooling water is detachably connected are provided at left and right (any one of them).
And a drain plug 26 is attached at the center thereof. Drain plug 26
Is composed of an outflow pipe 26a and a cock 26b. Then, each of the pipe connection portions 23 and 25 on the inflow side and the outflow side, respectively.
The drain plug 26 protrudes toward the front end wall 14. Further, the heat dissipating part 22 is provided inside the frame 22a so that a large number of thin tubes 22b are connected in a vertical direction between the upper tank 20 and the lower tank 21.
The heat radiation fins 22c are attached between b. Therefore, the cooling air flows through the gap defined by the thin tube 22b and the radiating fins 22c.
Heat exchange with the engine cooling water flowing through the engine.

Of the upper and lower partitions 16, 17 interposed between the front end wall 14 of the shroud 13 and the radiator 10,
The upper partition 16 is formed of a metal plate having a cross section bent in a substantially U-shape, and a rising portion on one side is screwed to the front end wall 14, and a rising portion on the other side is an upper side of the heat radiation portion 22 in the radiator 10. At a position (a range indicated by U in FIG. 2) between the frame body 22 a located at the upper side and the inflow side pipe connection portion 23 provided at the upper tank 20.
The mounting surface between the two rising portions is mounted in a state of being dropped downward. Further, the lower partition 17 is approximately L
It is composed of a metal plate bent in a letter shape, and its rising portion is screwed to the front surface of the front end wall 14. The end of the horizontal portion of the lower partition 17 is connected to the frame 22 a located below the radiator 22 in the radiator 10 and the outflow-side pipe connecting portion 2 provided in the lower tank 21.
5 and the drain plug 26 is in contact with a position (a range indicated by L in FIG. 2) between the drain plug and an upper one. Therefore, at least the inflow-side pipe connection 23 of the upper tank 20, the outflow-side pipe connection 25 of the lower tank 21, and the drain plug 26 are located outside the shroud 13.

The outflow-side pipe connection portion 25 and the drain plug 26 of the lower tank 21 project toward the front end wall 14, but as shown in FIG.
And D ₁ the distance between the, also the outflow side pipe connecting portion 25 and the projecting length of the drain plug 26 from the lower tank 21 is D ₂
When the protruding length D ₂ is smaller than the distance D _1.
Note that the upper tank 20 side and the inflow pipe connecting portion 23 toward the front wall 14 side is projected, the projection length is not limited to the distance D _1.

The radiator 10 is composed of a frame of an upper structure of a construction machine on which the radiator 10 is installed, and is detachably fixed to a pedestal 27 as a support member of the radiator 10. Further, although a part of each wall constituting the shroud 13 is in contact with each other, none of them is fixed. In order to fix the radiator 10 to the pedestal portion 27, a bracket 28 is fixedly provided on the pedestal portion 27, and a screw seat 2 is provided on the lower surface on both left and right sides of the lower tank 21.
9 is fixedly provided by means such as welding. The screw seat 29 is mounted on the mounting surface 28 a of the bracket 28, and is fastened using a bolt 30.
Of course, the fastening portion of the bolt 30 is also located below the lower partition 17.

With the above-described configuration, in a unitized state as a heat exchange device, the periphery of the cooling air passage is almost completely covered by the shroud 13 as in the above-described prior art. By rotating the fan, a large amount of cooling air can flow through the radiator of each heat exchanger including the radiator 10, the oil cooler 11, and the intercooler 12, and each fluid to be cooled is efficiently cooled.

The radiator 10 is located between the front end wall 14 of the shroud 13 and the oil cooler 11, but the radiator 10 can be taken out alone. To remove the radiator 10, the upper partition 16 and the lower partition 17 are separated from the front end wall 14, and the bolt 30 attached between the pedestal 27 and the screw seat 29 is removed. Thus, the radiator 10 is in a free state. However, the radiator 10 has an inflow-side pipe and an outflow-side pipe connected to the pipe connections 23 and 25 of the upper tank 20 and the lower tank 21, respectively. Therefore, the pipes are separated from the respective pipe connection parts 23, 25. The radiator 10, in addition to the upper tank 20 is therewith so member protruding longer than the distance D ₁ of the between the front end wall 14 of the shroud 13 is not present, when pulling out the radiator 10 straight upward, taken out easily separated It is. As a result, it is extremely advantageous in performing maintenance work such as cleaning the radiator 10 and repairing parts. Further, when the maintenance work or the like for the radiator 10 is completed, the radiator 10 can be mounted again on the heat exchange device unit in the reverse procedure.

Here, the heat exchanger which is installed at a position facing the front end wall 14 of the shroud 13 and which can be taken out so as to be drawn out upward may be the oil cooler 11, but the heat exchanger which flows through the inside thereof Most preferably, the fluid is radiator 10, which is water. When the heat exchanger is taken out of the heat exchanger unit by itself, each of the pipes on the inflow side and the outflow side must be separated, so that the fluid to be cooled flows out. Since the fluid to be cooled by the oil cooler 11 is hydraulic oil, it is not preferable that the fluid to be cooled flows out of the oil cooler 11. On the other hand, since the fluid to be cooled by the radiator 10 is water, there is no problem even if it leaks to the outside. Rather, before the pipe is separated, the cock 26
By operating b to discharge water after discharging water from the inside of the radiator 10 including the inside of the upper tank 20 and the lower tank 21, the removal is further facilitated. Further, cleaning and other maintenance are performed on the radiator 10, and the radiator 10 is assembled again into the unit of the heat exchange device. Then, after the connection of each of the piping on the inflow side and the outflow side is completed, the plug portion of the pressure cap 24 is removed. By simply opening and supplying water, the radiator 10
Can be returned to a fully operational state.

[0025]

According to the present invention, the first heat exchanger located at the position facing the cooling fan is taken out of the unit of the heat exchanger alone to facilitate cleaning and other maintenance work. In addition, effects such as efficient operation can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a heat exchange device according to an embodiment of the present invention.

FIG. 2 is a front view of a radiator included in the heat exchange device of FIG.

FIG. 3 is a bottom view of the radiator shown in a mounted state.

FIG. 4 is an explanatory diagram of a configuration of a heat exchange device according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Radiator 11 Oil cooler 12 Intercooler 13 Shroud 14 Front end wall 15 Side wall 16 Upper partition 17 Lower partition 20 Upper tank 21 Lower tank 22 Heat radiating part 23 Inflow side pipe connection part 25 Outflow side pipe connection part 26 Drain plug 27 Pedestal part 28 Bracket 29 Screw seat 30 Bolt

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F28F 9/00 321 F28F 9/00 321

Claims (5)

[Claims] 1. A plurality of heat exchangers are arranged in series, a cooling fan is arranged at one end of the heat exchangers, and the cooling air surrounding the cooling fans and passing through a heat radiating portion of each of the heat exchangers. The shroud is provided with an opening facing the cooling fan, the shroud is provided in connection with the front end wall, and a side portion of each heat exchanger is provided. Upper and lower partitions that cover upper and lower spaces between at least the front end wall and a first heat exchanger disposed at a position facing the cooling fan. Is detachably attached to the front end wall, and is provided with a pipe connecting portion connected to a lower position of the first heat exchanger protruding toward the cooling fan side, The projecting length of this pipe connection is A heat exchanger for a construction machine, wherein the distance between the first heat exchanger and the front end wall is shorter than a distance between the first heat exchanger and the lower end of the first heat exchanger. 2. The construction machine according to claim 1, wherein the upper and lower partitions are screwed to the front end wall and held in a non-fixed state with the first heat exchanger. Heat exchange equipment. 3. The heat exchanger for a construction machine according to claim 1, wherein the first heat exchanger is a radiator. 4. The radiator is provided with a lower tank at a lower position of a heat radiating portion, and a lower water tank is provided with an outflow pipe connection portion of engine cooling water and a drain plug so as to project toward the front end wall. 2. The heat exchanger for a construction machine according to claim 1, wherein a projecting length of the outflow-side pipe connection portion and the drain plug is shorter than a distance between the radiator and the front end wall. 5. The heat exchanging device for a construction machine according to claim 3, wherein at least an oil cooler is arranged at a position of the radiator opposite to a side facing the cooling fan.