JP2006329014A - Multiple structure cooling system with duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform cleaning work of these coolers, while securing cooling performance of a plurality of coolers mutually superposably arranged on a cooling air flow passage, in a work machine such as a hydraulic excavator. <P>SOLUTION: This multiple structure cooling system has the plurality of coolers 11a and 11b mutually superposably arranged on the cooling air flow passage. The multiple structure cooling system with a duct comprises a cover member for covering the outer periphery of a space S between mutually opposing one surface 11a<SB>1</SB>and one surface 11b<SB>1</SB>of at least adjacent two coolers 11a and 11b among the plurality of coolers 11a and 11b, an opening part 19 formed in the cover member, and the duct 30 formed over the other surface 11b<SB>2</SB>side of the cooler 11b positioned on the downstream side of the cooling air flow passage among the two coolers 11a and 11b from the opening part 19. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to maintenance of a multi-structure cooling apparatus suitable for use in a work machine such as a hydraulic excavator.

  In general, in a working machine such as a hydraulic excavator, outside air is sucked as cooling air from the outside of the machine and is cooled by passing it through a cooler such as a radiator or an oil cooler. However, since work machines are used for construction and renovation work in dams, tunnels, rivers, roads, etc., and demolition work for buildings, buildings, etc., a large amount of foreign matter such as dust generated during work is mixed in. Often used in a dry atmospheric environment. For this reason, the cooling air that cools the cooler includes foreign matters.

Such foreign matter may accumulate in the coolers and cause a decrease in cooling performance. For example, by providing a foreign matter control net as in the technique described in Patent Document 1, the inside of these coolers is provided. It is attempted to prevent foreign matters from entering. The foreign matter control net is inspected daily and the foreign matter deposited on the foreign matter control net is cleaned.
In addition, even if such a foreign material control net is provided, it is impossible to eliminate the accumulation of foreign material on the cooler itself. Use a device such as a compressor to supply high-pressure air (compressed air) to the foreign material control net and the cooler. By spraying with a nozzle, the foreign matter deposited and accumulated on the cooler is blown away and the cooler itself is cleaned.

  By the way, in order to efficiently use the installation space of the cooling system, as shown in FIG. 8A, a flow path of cooling air introduced into the radiator 3 and the oil cooler 4 by the cooling fan 2 driven by the engine 1. On the other hand, in general, it is arranged on the floor 6a of the upper swing body 6 of the work machine in a configuration in which the front and rear are arranged to overlap each other. When the cooler is cleaned by blowing compressed air, generally, the side door 5 is opened as shown by a two-dot chain line in FIG. 8 (a), and cleaning is performed from the side of the machine body. In the configuration in which the oil cooler 4 is arranged in the front-rear direction, foreign matter tends to accumulate in the space S between the radiator 3 and the oil cooler 4, and the radiator 3 is disposed behind the oil cooler 4. In addition, it is difficult to access the space S between the radiator 3 and the oil cooler 4, and it is difficult to clean the radiator 3 and the space S.

Such a space S between the coolers is preferably not present in consideration of cleanability, and a radiator and an oil cooler are also arranged in a configuration in which they are arranged side by side with respect to the cooling air flow path. However, when the radiators and oil coolers are arranged side by side with respect to the cooling air flow path, it is difficult to arrange them side by side while maintaining the width of the conventional cooler due to the layout of the fuselage. Each of the coolers needs to have a reduced width, and to increase the thickness of each cooler by the reduced width, in order to maintain a capacity for ensuring cooling performance.
Japanese Patent No. 3553782

As described above, in the configuration in which each cooler is arranged on the left and right with respect to the cooling air flow path, each cooler can be easily accessed, and the adhered and accumulated foreign matters are efficiently cleaned. Since there is no space S between them, no foreign matter is deposited in the space S as in the prior art.
However, depending on the type of the cooler, there are some that cannot secure the capacity at the depth. For example, since oil coolers have a special shape structure, there are restrictions in terms of production cost, production period, inventory management, etc. in order to prepare products with different shape dimensions, and there is a degree of freedom in changing the shape dimensions. Absent. Therefore, the oil cooler has a double structure oil cooler 4 in which two oil coolers 4 having a small depth are arranged in series as shown in FIG. It becomes. In this case, a space S is also created between the oil coolers 4, and foreign matter tends to accumulate in the portion S of the double structure of the oil cooler 4, which makes cleaning difficult.

Furthermore, in recent years, in addition to radiators and oil coolers, it has been common practice to install multiple coolers such as intercoolers and aftercoolers on work machines. It is difficult to arrange them, and even in this case, a space where foreign substances are easily deposited between the condensers to be polymerized is formed.
In addition, it is preferable that the coolers arranged close to each other cover the outer periphery (four sides) of the space between the coolers so that the cooling air efficiently passes through each cooler. However, as described above, when covered in this way, foreign matter is likely to accumulate in the space, and cleaning becomes difficult.

  The present invention has been devised in view of such problems, and it is easy to clean the coolers while ensuring the cooling performance of a plurality of coolers arranged so as to overlap each other on the cooling air flow path. It is an object of the present invention to provide a ducted multi-structure cooling apparatus which can be performed.

  In order to achieve the above object, a ducted multiple structure cooling apparatus according to claim 1 of the present invention is a multiple structure cooling apparatus comprising a plurality of coolers arranged to overlap each other on a cooling air flow path. A cover member that covers an outer periphery of a space between one surface and the opposite surface of at least two adjacent coolers of the plurality of coolers; an opening formed in the cover member; And a duct formed over the other surface side of the cooler located on the downstream side of the cooling air flow path.

  The multi-structure cooling device with a duct according to a second aspect of the present invention is the multi-structure cooling device with a duct according to the first aspect, wherein the plurality of coolers are attached, and the cooling air flow channel downstream side of the plurality of coolers. A frame that covers the outer periphery of the other surface side of the cooler, and a seal member interposed between the cooler located on the upstream side of the cooling air flow path of the two coolers and the frame, The duct is formed by the frame and the seal member.

  The multi-structure cooling device with duct according to claim 3 of the present invention is the multi-structure cooling device with duct according to claim 2, wherein the cooling fan provided on the downstream side of the cooling air flow path of the plurality of coolers, And a shroud covering at least the most downstream cooler adjacent to the cooling fan and the periphery of the cooling fan, and the duct is formed by the frame, the seal member, and the shroud, It is characterized by being provided so that one surface and the other surface of a most downstream cooler may be connected.

The multi-structure cooling apparatus with duct according to claim 4 of the present invention is the multi-structure cooling apparatus with duct according to any one of claims 1 to 3, wherein the opening is a bottom portion of the outer periphery of the space. It is formed in this cover member which covers.
The multi-structure cooling apparatus with duct according to claim 5 of the present invention is the multi-structure cooling apparatus with duct according to any one of claims 1 to 3, wherein the opening is on the side of the outer periphery of the space. It is characterized by being formed in this cover member which covers a part.

  According to the ducted multiple structure cooling apparatus of the present invention, in the multiple structure cooling apparatus having a plurality of coolers arranged so as to be superposed on each other on the cooling air flow path, at least one adjacent surface of two coolers is opposed to each other. The outer periphery of the space between the two surfaces is covered with a cover member, an opening is formed in the cover member, and the other surface side of the cooler located on the downstream side of the cooling air flow path of the two coolers from the opening Since the duct is formed over, the cooling performance of the plurality of coolers can be ensured. In addition, foreign matter that has entered the space between one surface and the other surface is automatically removed from the space through the duct after passing through the opening with the flow of some cooling air flowing through this space. Therefore, it is possible to prevent foreign matter from accumulating in the space. That is, the multi-structure cooling device can be maintenance-free or the frequency of maintenance can be greatly reduced.

  In addition, since the duct is formed using an existing member such as a frame that covers the outer periphery of the plurality of coolers and a shroud that covers the periphery of the cooling fan, the cost can be kept low.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a multi-structure cooling apparatus with a duct according to an embodiment of the present invention. FIG. 1 is a schematic longitudinal sectional view, FIG. 2 is a perspective view of the multi-structure cooling apparatus, and FIG. FIG. 4 is an exploded perspective view of a part of the ducted multi-structure cooling device, and FIG. 5 is a perspective view of the duct-equipped multi-structure cooling device.

In the present embodiment, an oil cooler arranged in a double structure will be described as a multiple structure cooling device. As will be described later, the multi-structure cooling device is not limited to a configuration in which the same cooler is doubled as in the present embodiment, but widely applied to a configuration in which different types of coolers are arranged in multiple. It is possible.
As shown in FIGS. 1 and 2, the double-structured oil cooler unit 11 of this embodiment has two oil coolers (hereinafter referred to as oil cooler portions) 11a and 11b of the same type and a predetermined distance (space). ) S is placed and superposed on the cooling air flow path. In addition, the white arrow shown in FIG. 1 and FIG. 7 mentioned later shows the flow of a cooling wind similarly to FIG. 8 used by description of background art.

  The oil cooler portions 11a and 11b are shared by the inlet tank portion 12 disposed above, the outlet tank portion 13 disposed below, the core portion 14 communicating these, and the inlet tank portions 12 and 12, respectively. The inlet pipe 15 is connected to the outlet tank section 13 and the outlet pipe 16 is connected to the outlet tank section 13 in common. The core section 14 flows in from the inlet tank section 12 although not shown in detail. A large number of tubes through which oil is circulated and cooling fins arranged on the outer periphery of the tubes are provided so that the circulated oil is cooled and then flows out to the outlet tank section 13.

As shown in FIGS. 1 to 3, the oil cooler unit 11, the space between the one surface 11b ₁ of the oil cooler portion 11a, one surface 11a ₁ of the space (the oil cooler portion 11a between 11b mutual and oil cooler section 11b ) On the outer periphery (four sides) of S, a cover member 10 including horizontal frames 17 and 17 and seal members 18T and 18B is installed so as to cover the space S in an airtight or substantially airtight manner. That is, the lateral frames 17 and 17 that support the oil cooler portions 11a and 11b are arranged on both side surfaces of the space S, respectively, and the upper and lower portions (bottom portions) of the space S are in close contact with both the tank portions 12 and 13. In addition, heat-resistant rubber seal members 18T and 18B (shown with a sand pattern in the figure) are interposed. The seal members 18T and 18B are divided into two parts because the inlet pipe 15 or the outlet pipe 16 is disposed in the central portion of the tank parts 12 and 13.

  As shown in FIGS. 4 and 5, the oil cooler unit 11 is attached to the main frame 20 disposed on the floor 6 a of the upper swing body 6 of the work machine together with the radiator 3 and side by side. As shown in FIG. 5, a fan shroud 21 is attached to the main frame 20 so as to cover the cooling air downstream space of the oil cooler unit 11 and the radiator 3. The fan shroud 21 has a function of efficiently circulating the cooling air introduced by the cooling fan 2 (see FIG. 1) driven by the engine between the oil cooler unit 11 and the radiator 3 and the cooling fan 2 without loss. It is. That is, the fan shroud 21 covering the periphery of the cooling fan 2 disposed on the downstream side of the cooling air flow path of the oil cooler unit 11 prevents the cooling air from leaking from the oil cooler portions 11a and 11b of the oil cooler unit 11 in the outer peripheral direction. It comes to prevent.

As shown in FIG. 1, a subframe 23 is provided to cover a gap between the main frame 20 and the fan shroud 21, and a frame 25 composed of the main frame 20 and the subframe 23 is spaced a predetermined distance. The oil cooler unit 11 (that is, the outer periphery of the other surface sides 11a ₂ and 11b ₂ of the oil cooler portions 11a and 11b) is disposed. As shown in FIG. 3, the seal member 18 </ b> B at the bottom of the oil cooler unit 11 is partially in part of the tank 13 (here, one end portion) disposed below the oil cooler portions 11 a and 11 b. The opening 19 is formed by being removed. And as shown in FIG. 1, the sealing member 22 extended toward the main frame 20 from the tank 13 of the oil cooler part 11a of the cooling air flow path upstream is further provided, and the frame 25, the fan shroud 21, the sealing member 22, The duct 30 is formed, and the space S inside the oil cooler unit 11 and the inside of the duct 30 communicate with each other through the opening 19, and a part of the cooling air in the space S passes through the duct 30 and is downstream of the cooling air flow path. It flows toward the fan shroud 21 in the center.

  In order to prevent the cooling air that has passed through the opening 19 from leaking from the duct 30, for example, a frame 25 on the side of the duct 30, a fan shroud 21, and the like are further appropriately provided with a seal member around the duct 30. It is preferable to form such that no gap is generated. For example, it is preferable to equip a seal member 42 (see FIG. 7) in an embodiment to be described later because leakage from the side can be prevented.

Since the multi-structure cooling apparatus with a duct according to one embodiment of the present invention is configured as described above, the following operations and effects are obtained.
The oil cooler unit 11 is cooled by allowing the cooling air introduced by the cooling fan 2 to pass through the core 14, but between the oil cooler portions 11 a and 11 b of the oil cooler unit 11 arranged to overlap each other. In the space S, dust (foreign matter) mixed in the cooling air easily accumulates.

In the present embodiment, the space S between the oil cooler portions 11a and 11b of the oil cooler unit 11 has an airtight structure in which the periphery (four sides) is sealed by the cover member 10 formed by the horizontal frames 17 and 17 and the seal members 18B and 18T. However, an opening 19 is formed at one end of the seal member 18B covering the bottom, and a duct 30 is formed by the frame 25, the fan shroud 21, and the seal member 22, and the duct 30 is one surface of the oil cooler 11b. 11b ₁ and the other surface 11b ₂ are provided so as to communicate with each other, so that most of the cooling air that has entered the oil cooler portion 11a on the upstream side of the cooling air flow passage basically goes to the oil cooler portion 11b on the downstream side. Although a slight amount, a part of the cooling air passes through the opening 19 and flows through the duct 30 to the downstream side of the cooling air flow path. The dust entering the space S is automatically removed from the space S through the duct 30 after passing through the opening 19 along with the flow of the cooling air. It is possible to prevent dust from accumulating. That is, the space S between the superposed oil coolers 11a and 11b can be maintenance-free, or the frequency of maintenance can be greatly reduced.

Note that the oil cooler unit 11 has a weak airtight structure in the space S as much as the opening 19 is provided, and the cooling efficiency is slightly lowered. Compared to the fact that the absence of 19, foreign matter accumulates in the space S and the cooling efficiency decreases, this is considered to be slight.
Furthermore, if the performance of the cooling fan 2 or the oil cooler unit 11 is slightly improved, the cooling performance of the oil cooler unit 11 can be ensured and at the same time the cleaning performance can be improved.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the meaning of this invention.
For example, in the present embodiment, the opening 19 is formed at one end of the seal member 18 that covers the bottom of the oil cooler unit 11, but it may be provided at both ends or at the center.

  Further, in this embodiment, the opening 19 is formed in the seal member 18 that covers the bottom of the oil cooler unit 11, but as shown in FIG. 6, even if the opening 41 is formed in the horizontal frame 17 that covers the side surface. good. In this case, as shown in FIG. 7, the seal member 42 extending from the lateral frame 17 covering the side surface of the upstream oil cooler portion 11 a toward the main frame 20, and between the main frame 20 and the fan shroud 21. A subframe 43 is provided to cover the gap. The duct 40 is formed on the side surface of the oil cooler unit 11 by the frame including the main frame 20 and the sub frame 43, the fan shroud 21, and the seal member 42.

  Therefore, most of the cooling air that has entered the oil cooler portion 11a on the upstream side of the cooling air flow passage basically flows to the oil cooler portion 11b on the downstream side. Flows sideways through 41. Then, the dust that has entered the space S along with the flow of this cooling air passes through the opening 41 and then passes through the duct 40 and is automatically removed from the space S so that the dust accumulates in the space S. Can be prevented.

  Further, for example, in the present embodiment, the case where the maintenance structure of the multi-structured cooler is applied to the double-structure oil cooler has been described. However, different coolers (for example, the multiple coolers arranged in the cooling air flow path (for example, Of course, a combination of a radiator and an oil cooler, a pair of an oil cooler and an intercooler, and the like can also be applied.

It is a typical longitudinal section of a multiple structure cooling device with a duct concerning one embodiment of the present invention. It is a principal part perspective view of the multiple structure cooling device with a duct concerning one embodiment of the present invention. It is an A direction arrow directional view of Drawing 2 showing a multiple structure cooling device with a duct concerning one embodiment of the present invention. It is a perspective view which shows the structure which decomposed | disassembled one part of the multiple structure cooling device with a duct which concerns on one Embodiment of this invention. It is a perspective view which shows the multiple structure cooling device with a duct which concerns on one Embodiment of this invention. It is a perspective view of the multiple structure cooling device with a duct concerning other embodiments of the present invention. It is a typical cross-sectional view which shows the multiple structure cooling device with a duct which concerns on other embodiment of this invention. It is a typical top view explaining the arrangement method of a common cooler.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Cooling fan 3 Radiator 4 Oil cooler 5 Side door 6 Upper turning body 10 Cover member 11 Oil cooler unit (multi-structure cooling device)
11a, 11b Oil cooler (cooler)
11a ₁ , 11b ₁ one side 11a ₂ , 11b ₂ other side 12 inlet tank part 13 outlet tank part 14 core part 15 inlet pipe 16 outlet pipe 17 horizontal frame (cover member)
18T, 18B Seal member (cover member)
19, 41 Opening 20 Main frame 21 Fan shroud (shroud)
22, 42 Seal member 23, 43 Subframe 25 Frame 30, 40 Duct S space (space between a plurality of coolers)

Claims (5)

In a multi-structure cooling apparatus having a plurality of coolers arranged to overlap each other on a cooling air flow path,
A cover member that covers the outer periphery of the space between one surface and the other surface of at least two adjacent coolers of the plurality of coolers;
An opening formed in the cover member;
A multi-structure cooling device with a duct, characterized by comprising a duct formed from the opening to the other surface side of the cooler located on the downstream side of the cooling air flow path of the two coolers. The plurality of coolers are attached, and a frame that covers the outer periphery of the other surface side of the cooler located on the downstream side of the cooling air flow path among the plurality of coolers;
A seal member interposed between the cooler located on the upstream side of the cooling air flow path of the two coolers and the frame;
The multi-structure cooling apparatus with a duct according to claim 1, wherein the duct is formed by the frame and the seal member. A cooling fan provided on the downstream side of the cooling air flow path of the plurality of coolers;
A shroud that covers at least the most downstream cooler adjacent to the cooling fan and the periphery of the cooling fan among the plurality of coolers;
3. The duct according to claim 2, wherein the duct is formed by the frame, the sealing member, and the shroud, and is provided so as to communicate one surface of the most downstream cooler with the other surface. Multi-structure cooling device with duct. The multi-structure cooling apparatus with a duct according to any one of claims 1 to 3, wherein the opening is formed in the cover member that covers the bottom of the outer periphery of the space. The multiple structure cooling device with a duct according to any one of claims 1 to 3, wherein the opening is formed in the cover member that covers a side portion of the outer periphery of the space.

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