JP5271802B2 - Construction machine cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device for a construction machine that can lower the temperature of an operating fluid liable to be high in temperature and led to an oil cooler from a heat source for raising the temperature of the operating fluid. <P>SOLUTION: The cooling device provided at a hydraulic shovel having a heat source, e.g. a control valve 16, for raising the temperature of the operating fluid led to the oil cooler 17, includes an air guide body, e.g. a case 21, for guiding air generated by a fan 18, to cool the control valve 16. The case 21 includes a hole 21a in which the fan 18 is arranged; a first guide path 21b having a first opening 21b1 facing the control valve 16, and radiating air generated by the fan 18, to the control valve 16 from the first opening 21b1; and a second guide path 21c having a second opening 21c1 formed in a position below the outlet side of the fan 18, and ejecting the air generated by the fan 18 to an outside lower part of the case 21 from the second opening 21c1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cooling device for a construction machine that is provided in a construction machine such as a hydraulic excavator and that can cool a heat source that raises the temperature of hydraulic oil guided to an oil cooler.

  Conventionally, Patent Document 1 discloses a technique for cooling a hydraulic pump provided in a construction machine such as a hydraulic excavator as a cooling device for a construction machine. In this prior art, a passage for guiding the wind of a fan driven to cool the oil cooler to the hydraulic pump is provided, and the wind guided to the passage is radiated toward the hydraulic pump to cool the hydraulic pump. It is a thing.

JP 2000-120106 A

  The above-described conventional technology is a technology for cooling a hydraulic pump, and no consideration is given to cooling hydraulic oil that is likely to reach a high temperature and is led to an oil cooler. For example, the control valve constitutes one of the heat sources for raising the temperature of the hydraulic oil led to the oil cooler. In the above-described conventional technology, the control valve is used to guide the wind generated by the fan to the hydraulic pump. Are arranged so as not to obstruct the wind flow. In other words, the above-described conventional technology is different from the technology that intentionally cools the control valve, and the control valve is cooled to some extent when the wind generated by the fan touches the control valve. A sufficient cooling effect on the valve cannot be expected. For this reason, in the prior art described above, relatively high temperature hydraulic oil is easily guided from the controller to the oil cooler.

  The present invention has been made from the above-described prior art, and its purpose is to cool a construction machine that can lower the temperature of hydraulic oil that is likely to reach a high temperature, which is led to an oil cooler from a heat source that raises the temperature of the hydraulic oil. To provide an apparatus.

In order to achieve this object, a cooling device for a construction machine according to the present invention includes an oil cooler, a fan for generating air that cools the oil cooler, and a heat source that raises the temperature of hydraulic oil guided to the oil cooler. Provided with a wind guide body that guides wind generated by the fan for cooling the heat source, the wind guide body including a housing, and the housing has a hole in which the fan is disposed. And a first guide path that has a first opening facing the upper surface portion of the heat source and radiates wind generated by the fan from the first opening to the heat source, and a lower position on the outlet side of the fan And a second guide passage for discharging the wind generated by the fan to the outside of the housing from the second opening, and below the heat source, the first opening is provided. Drain from the opening above It is characterized by comprising an exhaust port for discharging the emitted air to the outside downwardly to the source.

Thus the present invention constructed, the wind occurred by the fan through the guide Futei toward the first opening facing the upper surface portion of the heat source in the heat source is radiated, Rukoto is exhausted from the exhaust port below the heat source Can do. As a result, the heat source that raises the temperature of the hydraulic oil can be cooled, and the temperature of the hydraulic oil that tends to reach a high temperature that is led from the heat source to the oil cooler can be lowered. Therefore, when it is desired to maintain the cooling efficiency of the oil cooler equivalent to the conventional one, the capacity of the oil cooler can be reduced. Further, when an oil cooler having a capacity equivalent to that of the conventional one is provided, the cooling efficiency of the oil cooler can be increased. In addition, when an oil cooler with the same capacity as the conventional one is provided and the cooling efficiency equivalent to the conventional one is to be maintained, the rotational speed of the fan that generates the air that cools the oil cooler may be lower than the conventional one. it can. Further, according to the present invention, a part of the wind generated by the fan is guided to the second guide path and discharged to the outside of the housing through the second opening, so that the wind on the outlet side of the fan can be discharged. Generation of turbulent flow can be suppressed. As a result, the wind generated by the fan can be smoothly guided to the first guide path, and the wind can be radiated from the first opening toward the heat source as described above, thereby cooling the heat source. Excellent cooling efficiency for the heat source can be ensured.

  The construction machine cooling device according to the present invention is the construction machine according to the present invention, wherein the construction machine is composed of a hydraulic excavator having a swing body and a front work machine, and the oil cooler, the fan, and the heat source are arranged in the swing body. The heat source includes a control valve that controls driving of the front working machine and the revolving structure, or a revolving motor that revolves the revolving structure.

  The present invention configured as described above is provided in a hydraulic excavator and can reliably cool a control valve or a swing motor constituting a heat source for raising the temperature of hydraulic oil by wind generated by a fan. It is possible to lower the temperature of the hydraulic oil that is likely to reach a high temperature led to the oil cooler.

The present invention includes an air guide that guides the air generated by the fan that cools the oil cooler to cool the heat source that raises the temperature of the hydraulic oil that is guided to the oil cooler. The heat source that raises the temperature of the oil can be cooled, whereby the temperature of the hydraulic oil that tends to reach a high temperature that is led from the heat source to the oil cooler can be lowered. Therefore, when the cooling efficiency of the oil cooler equivalent to the conventional one is secured, the capacity of the oil cooler can be reduced, and the manufacturing cost of the oil cooler can be reduced. In addition, when an oil cooler having a capacity equivalent to that of the conventional one is provided, the cooling efficiency of the oil cooler can be increased as compared with the conventional one, and an excellent temperature rise suppression for hydraulic oil can be realized. In addition, when an oil cooler with the same capacity as the conventional one is provided and the cooling efficiency equivalent to the conventional one is to be maintained, the rotational speed of the fan that generates the air that cools the oil cooler may be lower than the conventional one. And power consumption for driving the fan can be reduced. Further, noise caused by the fan can be suppressed. Further, according to the present invention, the wind guide body includes a housing, and the housing has a hole in which the fan is disposed and a first opening facing the upper surface portion of the heat source. A first induction path that radiates from the opening to the heat source and a second opening formed at a lower position on the outlet side of the fan, and the air generated by the fan is discharged from the second opening to the outside of the housing. And a second induction path, and an exhaust port is provided below the heat source to exhaust the wind exhausted from the first opening and radiated to the heat source to the outside downward, so that part of the wind generated by the fan is Since the air is guided to the second guide path and discharged to the outside of the housing through the second opening, the occurrence of wind turbulence on the outlet side of the fan can be suppressed. Thus, the wind generated by the fan can be smoothly guided to the first guide path, and the wind can be radiated from the first opening toward the heat source to cool the heat source. Cooling efficiency can be ensured.

1 is a side view of a hydraulic excavator cited as an example of a construction machine to which an embodiment of a cooling device according to the present invention is applied. It is a top view which shows the turning body with which the hydraulic shovel shown in FIG. 1 is equipped. It is a side view which shows the principal part structure of one Embodiment of the cooling device which concerns on this invention. Ru perspective view showing a housing provided in an embodiment of a cooling device according to the present invention.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the cooling device of the construction machine which concerns on this invention is demonstrated based on figures.

  FIG. 1 is a side view of a hydraulic excavator cited as an example of a construction machine to which an embodiment of a cooling device according to the present invention is applied. FIG. 2 is a plan view showing a swivel body provided in the hydraulic excavator shown in FIG. 3 is a side view showing the configuration of the main part of one embodiment of the cooling device according to the present invention, and FIG. 4 is a perspective view showing a housing provided in one embodiment of the cooling device according to the present invention.

  A construction machine to which an embodiment of the present invention is applied is, for example, a hydraulic excavator. The hydraulic excavator includes a traveling body 1 and a revolving body 2 disposed on the traveling body 1 as shown in FIG. And a front work machine 3 attached to the swivel body 2 so as to be rotatable in the vertical direction. The front work machine 3 includes a boom 4 that is attached to the swing body 2 so as to be rotatable in the vertical direction, an arm 5 that is rotatably attached to the tip of the boom 4, and a pivot that can be turned to the tip of the arm 5. And a bucket 6 to be attached. On the swivel frame 2 a of the swivel body 2, as shown in FIG. 2, an operation room 7, an engine room 9, and a cooling room 10 disposed between the operation room 7 and the engine room 9 are provided. Is provided. In addition, a counterweight 8 that secures a weight balance is provided at the rear part of the revolving unit 2.

  As shown in FIG. 2, an engine 11 and a hydraulic pump 12 driven by the engine 11 are arranged in an engine room 9 provided in the revolving structure 2. Moreover, the radiator 13 which comprises a heat exchanger, and the fan 14 which raises the wind which cools this radiator 13 are arrange | positioned. Further, as shown in FIG. 2, in the vicinity of the center of the swing body 2, a swing motor 15 that constitutes a swing device that rotates the swing body 2, the traveling body 1, the swing body 2, and the front work machine 3 are driven. A control valve 16 for controlling the flow of pressure oil discharged from the hydraulic pump 12 is disposed. Further, a fuel tank 19 and a hydraulic oil tank 20 are disposed in the vicinity of the side opposite to the cab 7.

  As described above, the cooling chamber 10 is formed between the cab 7 and the engine chamber 9, and a cooling device according to this embodiment described later is disposed. The turning motor 15 that turns the turning body 2 described above, and the control valve 16 that controls the driving of the traveling body 1, the turning motor 15 of the turning body 2, and the front work machine 3 are heat disposed in the cooling chamber 10. It constitutes a heat source that raises the temperature of the hydraulic oil guided to the oil cooler 17 that constitutes the exchanger. The cooling device according to the present embodiment includes, for example, one that cools the control valve 16 among these heat sources.

  As shown in FIG. 2, the engine chamber 9 and the cooling chamber 10 are partitioned by a wall 10a. As shown in FIG. 3, the cooling chamber 10 has an intake port 24 that guides air into the cooling chamber 10 on the upstream side in the flow of wind, and the air in the cooling chamber 10 on the upper surface on the downstream side of the swivel body 2. It has an exhaust port 25 for exhausting the upper part of the exterior, and has exhaust ports 26 and 27 for exhausting the air in the cooling chamber 10 to the lower part of the revolving unit 2 on the bottom surface on the downstream side. Further, the above-described oil cooler 17 fixed on the swivel frame 2a is disposed on the upstream side in the cooling chamber 10, and a shroud 23 that is connected to the oil cooler 17 and smoothly guides the flow of wind is provided. It is formed. In addition, a fan 18 for generating air for cooling the oil cooler 10 is disposed on the outlet side of the shroud 23, and a motor 22 for driving the fan 18 is disposed.

  The present embodiment includes an air guide that guides the wind generated by the fan 18 for cooling the heat source, that is, the control valve 16, for example, the housing 21 shown in FIG. 4. The casing 21 is fixed to the shroud 23 integrally, for example, and is fixed to the turning frame 2a. As shown in FIG. 4, the housing 21 is opposed to the hole 21 a in which the fan 18 for generating the air to cool the oil cooler 17 described above is disposed and the upper surface portion of the control valve 16 constituting the heat source. A first guide passage 21b that has one opening 21b1 and radiates wind generated by the fan 18 from the first opening 21b1 to the control valve 16; A second guide path that has the second opening 21c1 that communicates with the exhaust port 26 described above, and that exhausts the wind generated by the fan 18 from the second opening 21c1 to the outside of the housing 21, that is, to the lower outside of the swivel body 2. 21c. Moreover, the housing | casing 21 is provided with the bracket 21d in which the motor 22 which drives the fan 18 is mounted, for example in the inside.

  The cooling device according to the present embodiment that cools the control valve 16 includes an intake port 24 and exhaust ports 25, 26, and 27 of the cooling chamber 10 in which the oil cooler 17 is housed, a fan 18 and a motor 22, a housing 21, and the like. It is constituted by.

  As shown in FIG. 3, in this embodiment configured as described above, by driving the motor 22 and rotating the fan 18, air is sucked into the cooling chamber 10 from the intake port 24 of the cooling chamber 10, and the exhaust is exhausted. Air is generated in the cooling chamber 10 so that air in the cooling chamber 10 is discharged from the ports 25, 26, and 27, and the oil cooler 17 is cooled by the flow of the wind.

  Also, a control valve that raises the temperature of the hydraulic oil that is guided to the oil cooler 17 by radiating the wind generated by the fan 18 from the first opening 21b1 of the first guide path 21b of the housing 21 toward the control valve 16. 16 can be cooled, and the temperature of the hydraulic oil that tends to become high temperature led from the control valve 16 to the oil cooler 17 can be lowered.

  Therefore, according to the present embodiment, when it is desired to maintain the cooling efficiency of the oil cooler 17 equivalent to the conventional one, the capacity of the oil cooler 17 can be reduced, and the manufacturing cost of the oil cooler 17 can be reduced. Further, when the oil cooler 17 having the same capacity as that of the conventional one is provided, the cooling efficiency of the oil cooler 17 can be increased, and the suppression of the temperature rise with respect to excellent hydraulic oil can be realized. In addition, when the oil cooler 17 having the same capacity as the conventional one is provided and the cooling efficiency equivalent to the conventional one is to be maintained, the rotation speed of the fan 18 that generates the air for cooling the oil cooler 17 is set to be lower than the conventional one. Therefore, power consumption for driving the fan 18 can be reduced. Further, noise caused by the fan 18 can be suppressed.

  In addition, a housing 21 having a first guiding path 21b that guides the wind radiating from the control valve 16 and a second guiding path 21c that discharges the wind generated by the fan 18 to the outside of the revolving structure 2 is provided. Then, a part of the wind on the outlet side of the fan 18 is discharged to the outside lower side of the revolving structure 2 through the second opening 21c1 and the exhaust port 26 of the second guide path 21c, whereby the wind on the outlet side of the fan 18 is discharged. The generation of turbulence can be suppressed. Thus, the wind generated by the fan 18 is smoothly guided to the first guide path 21b, and the wind is radiated from the first opening 21b1 to the control valve 16 to ensure excellent cooling efficiency for the control valve 16. be able to.

  In the above-described embodiment, the control valve 16 is described as the heat source for raising the temperature of the hydraulic oil guided to the oil cooler 17, but such a heat source is not limited to the control valve 16. For example, the turning motor 15 that turns the turning body 2 may be used as the heat source. That is, in order to cool the turning motor 15, even when the same configuration as that of each of the above-described embodiments is provided, the temperature of the hydraulic oil that is easily led to the oil cooler 17 can be lowered.

2 slewing body 2a slewing frame 3 front work machine 10 cooling chamber 10a wall 15 slewing motor (heat source)
16 Control valve (heat source)
17 Oil cooler 18 Fan 21 Housing (wind guide)
21a hole 21b first guide path 21b1 first opening 21c second guide path 21c1 second opening 21d bracket 22 motor 23 shroud 24 intake port 25 exhaust port 26 exhaust port 27 exhaust port

Claims (2)

Provided in a construction machine having an oil cooler, a fan for generating air to cool the oil cooler, and a heat source for raising the temperature of the hydraulic oil led to the oil cooler;
Providing a wind guide for guiding the wind generated by the fan to cool the heat source ;
The wind guide body includes a casing, and the casing has a hole in which the fan is disposed and a first opening facing the upper surface portion of the heat source, and the wind generated by the fan is the first opening. A first guide path that radiates from the fan to the heat source, and a second opening formed at a lower position on the outlet side of the fan, and wind generated by the fan from the second opening to the housing. A second taxiway for discharging to the outside,
A cooling device for a construction machine, wherein an exhaust port is provided below the heat source to discharge the wind discharged from the first opening and radiated to the heat source to the outside downward . The cooling device for a construction machine according to claim 1,
The construction machine comprises a hydraulic excavator having a swivel body and a front work machine, and the oil
A cooler, the fan, and the heat source are disposed in the swivel body, and the heat source is
A control valve that controls the drive of the ronto work machine, or a turn that turns the swivel body
A cooling device for a construction machine comprising a motor .

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