JP2006037661A - Heat exchange device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily attach and detach a dustproof net fitted to a heat exchanger from the ground. <P>SOLUTION: The dustproof net 20 is divided into an upper dustproof net 21 and a lower dustproof net 22. An oil cooler 13 is supported on a pair of right and left posts 17 and 17 vertically installed on the frame of an upper slewing body 2. A pair of right and left hooks 23 are installed at upper positions of the posts 17, a pair of right and left hooks 24 to which both hooks 23 are hooked to the upper end of the frame 21a of the upper dustproof net 21, and a pair of right and left hooks 25 and 25 are fitted to the lower end of the upper dustproof net 21. A hook 26 is fitted to the upper end of the frame 22a of the lower dustproof net 22, and both right and left sides of the lower dustproof net 22 at the lower position are fixed to the posts 17 with thumscrews 29. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchange device provided in a construction machine, and more particularly to improvement of a dustproof net attached to a heat exchanger.

  Working means for carrying a vehicle, turning an upper-part turning body, excavating work, etc. by operating a hydraulic actuator comprising a hydraulic motor and a hydraulic cylinder with a hydraulic pump driven by an engine and operating a hydraulic actuator comprising a hydraulic motor and a hydraulic cylinder. An example of a construction machine configured to be driven is a hydraulic excavator. Thus, since the hydraulic excavator has an engine and a hydraulic system, the temperature of the engine coolant and the hydraulic oil must be controlled. For this purpose, a heat exchanger such as a radiator and an oil cooler is provided. The heat exchanger is composed of a tank for cooling fluid inflow, an outflow tank, and a heat exchanger main body composed of a large number of thin tubes and fins.

  In the case of a radiator, when engine cooling water flows into the inflow tank as a fluid to be cooled and passes through the heat exchanger body, it is cooled by exchanging heat with the cooling air supplied to the heat exchanger. Later, it is returned to the engine via an outflow tank. This keeps the engine from overheating during operation. In the case of an oil cooler, the hydraulic oil is used as a fluid to be cooled, and the return oil from the hydraulic actuator passes through the oil cooler, so that the hydraulic oil flowing through the hydraulic circuit is brought to an appropriate temperature state. The viscosity is kept and prevents the viscosity from being abnormally lowered. Usually, these radiators and oil coolers are installed in an engine room constituting the building of the upper-part turning body, and are arranged so as to face the flow path of a cooling fan using the engine as a drive source. From the standpoint of downsizing the cooling fan, the radiator and the oil cooler are provided in series. The oil cooler is arranged upstream of the cooling air flow by the cooling fan, and the radiator is arranged downstream. It is common.

  A hydraulic excavator generally operates outdoors, and cooling air from a cooling fan is taken in from an outside air intake portion provided on a wall surface of an engine room. When the outside air is sucked in, foreign matter such as dust, resin sheets and paper, and foreign matters such as insects are transferred to the outside air sucked into the engine room, and thus flow into the heat exchanger described above. As is well known, the heat exchanger body is provided with a large number of capillaries at relatively short pitch intervals, and fins are attached to the capillaries, and in order to increase the heat exchange efficiency, the surface area of the fins is made as large as possible. Therefore, the air circulation part in the heat exchanger body is divided into a large number of minute spaces. Therefore, when the above-mentioned foreign matter is sucked together with the outside air, it adheres to the fins and thin tubes and closes the air circulation part, so-called clogged state, resulting in a decrease in the air flow rate and poor heat exchange efficiency. .

In consideration of the above points, it is possible to minimize foreign matter from adhering to the heat exchanger body by attaching a dustproof net to a plurality of heat exchangers arranged in series located on the upstream side of the cooling air. I try to limit it to the limit. However, if a large amount of foreign matter adheres to the dust-proof net, the airflow loss of the cooling air also increases, and the foreign matter may pass through the dust-proof net and adhere to the heat exchanger body. When the period elapses, the dust-proof net is clogged due to adhesion of foreign matter, and the heat exchanger is also clogged to some extent during a long period. Therefore, the dust-proof net attached to the heat exchanger can be attached and detached, and when the heat exchange efficiency decreases, the dust-proof net can be cleaned, and the dust-proof net can be removed to clean the heat exchanger. This is shown, for example, in Patent Document 1.
JP-A-7-189695

  In the configuration shown in Patent Document 1 described above, slide guides are installed on the left and right of the front position of the heat exchanger, a dustproof net is inserted through the slide guide, and screwed at two locations on the top and bottom. ing. Therefore, when removing the dust-proof net, first, after removing the screw, the operator needs to climb up to the upper part of the engine room and lift it up along the slide guide. And since the work of cleaning after removing the dustproof net is usually done on the ground, the dustproof net that has been lifted once must be lowered from the vehicle, and the dustproof net after cleaning is remounted. In addition, the worker has to climb the engine room again and pull up the dust-proof net, which makes it difficult to attach and detach the dust-proof net.

  This invention is made | formed in view of the above point, The place made into the objective is to make it easy to attach or detach the dustproof net with which a heat exchanger is mounted | worn from the ground.

  In order to achieve the above-described object, the present invention provides one or a plurality of unitized heat exchangers installed in a building of a construction machine and cooled by cooling air from a cooling fan, and the heat exchangers. A heat exchange device comprising a dustproof net mounted on the most upstream surface of the cooling air by the cooling fan, wherein the dustproof net is divided into two parts, and the upper dustproof net has its upper end portion A hook is provided on the hook portion provided at the upper position of the heat exchanger, and the hook portion is mounted on the lower side thereof. The lower dustproof net is a hook provided at the lower position of the upper dustproof net. The present invention is characterized in that a hanging metal fitting is provided on the portion, and the lower position of the lower dustproof net is screwed to the lower position of the heat exchanger.

  Here, there are a case where a single heat exchanger is disposed opposite to the cooling fan and a case where a plurality of heat exchangers are provided. And as a kind of heat exchanger, although a radiator and an oil cooler are provided, the condenser for an intercooler and an air conditioner may be provided further. The radiator and the oil cooler are formed of substantially the same size, and the oil cooler is generally disposed on the upstream side and the radiator is disposed on the downstream side. And when these are arrange | positioned in series, since air will flow from the clearance gap between an oil cooler and a radiator, the space | interval between them is narrowed or a clearance gap is covered with a shielding board. A plurality of unitized heat exchangers refers to those configured in this way. If the intercooler is arranged upstream of the oil cooler, this intercooler is an oil cooler or the like. In general, this intercooler is not unitized with an oil cooler or the like. The same applies to the capacitor. Accordingly, since these are different members from the oil cooler and the radiator, the dust-proof net attached to the uppermost stream side of the unitized heat exchanger is attached to the oil cooler. In addition, when the intercooler and the like are substantially unitized with the same size as the radiator and the oil cooler, a dustproof net is attached to the upstream surface of the intercooler.

  When the heat exchanger is supported by the posts provided on the left and right of the heat exchanger, a hook for hooking the hook part of the upper dustproof net is provided on both posts and the lower part of the lower dustproof net is fixed. It is possible to provide a screw hole into which a screw to be screwed is inserted. In addition, it is more desirable to use a thumbscrew so that the screw can be attached and detached without using a special tool.

  Both the upper dust-proof net and the lower dust-proof net are configured by attaching a net to a frame-shaped frame, but the hook portion, the hanging bracket and the screw hole are naturally provided in the frame-shaped frame. The upper dustproof net and the lower dustproof net may be substantially the same size, or the sizes of the upper and lower dustproof nets may be different. The sizes of these two dustproof nets are determined so that they can be attached and detached without interfering with them when any member is arranged on the front surface thereof. From the viewpoint of easy attachment / detachment, it is advantageous to make the lower dustproof net larger than the upper dustproof net. In addition, when the mounting position is high, it is possible to facilitate attachment / detachment work from the ground by enlarging the upper dustproof net.

  As described above, the dust-proof net is divided into two parts, and the hook is attached to the hanging bracket, so that the dust-proof net can be easily attached and removed from the ground without climbing the top of the engine room of the construction machine. There is an effect that it can be performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows an overall configuration of a hydraulic excavator as an example of a construction machine equipped with the heat exchange device of the present invention. In the figure, 1 is a lower traveling body and 2 is an upper turning body. The upper swing body 2 is mounted on the lower traveling body 1 via the swing device 3 so as to be swingable. An excavation work means 4 including a boom 4a, an arm 4b, and a bucket 4c is attached to the upper swing body 2, and a cab 5 for an operator to operate the machine is located at a position along with the excavation work means 4. is set up. Further, an engine room 6 constituting a building as a machine room is provided at the rear position of the cab 5, and a counterweight 7 is provided at the rearmost position.

  An example of the internal structure of the engine room 6 is shown in FIGS. In the figure, reference numeral 10 denotes an engine, and 11 denotes a hydraulic pump. A hydraulic pump 11 is driven by using the engine 10 as a power source, and a traveling hydraulic motor provided in the lower traveling body 1 by oil discharged from the hydraulic pump 11. Then, the turning hydraulic motor provided in the turning device 3 is driven, and the hydraulic cylinders provided in the boom 4a, the arm 4b and the bucket 4c constituting the excavation work means 4 are driven.

  Reference numerals 12 and 13 denote a radiator and an oil cooler as heat exchangers, respectively, and reference numeral 14 denotes a cooling fan. The cooling fan 14 is driven by the engine 10, and the rotation of the cooling fan 14 causes outside air to be taken in from the outside air intake 15 provided on the wall surface of the engine room 6 as indicated by an arrow in the figure. After the cooling air is sequentially supplied to the oil cooler 13 and the radiator 12, a flow of air discharged from the discharge port 16 to the outside of the engine room 6 is formed.

  In the configuration of FIG. 2, the oil cooler 13 is disposed on the upstream side of the cooling air, and foreign matter such as dust, sheet-like flying objects, insects, and the like is conveyed to the outside air taken in from the outside air intake port 15. You will enter room 6. These foreign substances are sucked into the oil cooler 13 by the action of the cooling fan 14. In order to prevent the oil cooler 13 from being clogged by such foreign matter, a dustproof net 20 is attached to the suction side of the oil cooler 13.

  FIG. 4 shows the configuration of the dustproof net 20 attached to the oil cooler 13. First, the oil cooler 13 is supported by a pair of left and right posts 17, 17 erected from the frame of the upper swing body 2. The dust net 20 is divided into two members, an upper dust net 21 and a lower dust net 22. These upper and lower dust-proof nets 21 and 22 are each composed of frames 21a and 22a in which metal thin plates or the like are formed in a frame shape, and nets 21b and 22b mounted inside the frames 21a and 22a. Here, these dust-proof nets 21 and 22 have substantially the same dimensions, and are attached to the front position of the upstream side surface 13a of the cooling air in the oil cooler 13.

  The upper dustproof net 21 is attached to the post 17. For this purpose, a pair of left and right hooks 23 made of L-shaped or U-shaped metal rods are provided above the post 17, and both hooks 23 are disposed at the upper end position of the frame 21 a of the upper dust-proof net 21. A pair of left and right hanging metal fittings 24 made of a metal rod formed in a loop shape is attached. Therefore, the upper dustproof net 21 is attached by hanging the hook 24 on the hook 23 provided on the post 17 so as to be lifted from the ground by an operator.

  A pair of left and right hooks 25, 25 are provided at the lower end of the upper dust-proof net 21. The lower dust-proof net 22 is provided with latches 26 at positions on the left and right sides of the upper end of the frame 22a. The latches 26 are hooked on the hooks 25. The hooks 25 and the hooks 26 are the same members as the hooks 23 and the hooks 24. Therefore, when the lower dustproof net 22 is attached to the upper dustproof net 21 so as to be connected, the lower part of the frame 21a of the upper dustproof net 21 and the upper part of the frame 22a of the lower dustproof net 22 are separated. Almost completely overlaps. Thereby, the dust-proof net 20 composed of the upper dust-proof net 21 and the lower dust-proof net 22 covers almost the entire upstream side surface 13a in the portion that becomes the heat exchanger body of the oil cooler 13.

  Further, screw insertion holes 27 are formed on the left and right sides of the lower portion of the frame 22a of the lower dustproof net 22, and positions corresponding to the screw insertion holes 27 of the lower dustproof net 22 in both posts 17. Each is provided with a screw hole 28. Therefore, the lower end portion of the lower dustproof net 22 connected to the upper dustproof net 21 is inserted by inserting the thumbscrew 29 from the surface side of the frame 22a into the screw insertion hole 27 and screwed into the screw hole 28 provided in the post 17. Therefore, the dust-proof net 20 is fixed to the upstream side surface 13 a of the oil cooler 13.

  By configuring as described above, when the dustproof net 20 is clogged due to adhesion of foreign matter, the dustproof net 20 can be easily removed and cleaned. That is, an operator who cleans the dustproof net 20 opens a side cover (not shown) of the engine room 6 on the ground, and removes the butterfly screw 29 fixing the lower dustproof net 22 to the post 17. . This operation can be easily performed without using a special tool or the like. After detaching the thumbscrew 29, the lower dust-proof net 22 is lifted by a predetermined amount and moved to the near side, so that the hook 26 is detached from the hook 25 of the upper dust-proof net 21. Therefore, the lower dustproof net 22 can be separated from the oil cooler 13 and taken out. Further, in order to remove the upper dustproof net 21, the upper dustproof net 21 can be easily removed by lifting the upper dustproof net 21 and moving it to the near side.

  Here, in the case of a general hydraulic excavator, since the height dimension from the ground to the frame of the upper swing body 2 is 1.2 m or less, the lower dustproof net 22 is of course even if the operator is on the ground. The height from the frame of the upper revolving structure 2 to the lower end of the upper dustproof net 21 is about 50 cm, so that a normal operator can remove the hanging metal fitting 24 of the upper dustproof net 21 from the hook 23 provided on the post 17. There is no risk of hindering any lifting to the extent that it can be removed.

  The upper and lower dust-proof nets 21 and 22 thus taken out can be cleaned using, for example, a cleaning tool or a brush that jets high-pressure air. Moreover, it is also possible to clean by blowing high-pressure air on the oil cooler 13 as necessary. When this cleaning is completed, the hanging bracket 24 of the upper dustproof net 21 is hooked on the hook 23, and then the hanging bracket 26 of the lower dustproof net 22 is hooked on the hook 25, and then the thumbscrew 29 is tightened. Thus, the dustproof net 20 is fixed to the oil cooler 13 in a stable state.

  Thus, the upper dust-proof net 21 and the lower dust-proof net 22 are connected by hooks and hooks, but the hooks 24 are attached to the upper positions of the upper dust-proof nets 21. In addition, a hook 25 is provided at the lower position, and this hook 25 is provided on the opposite side to the side facing the oil cooler 13. Therefore, the upper dust-proof net 21 has no projections on the surface facing the oil cooler 13, and the lower dust-proof net 22 similarly has no projections on the surface facing the oil cooler 13. Also does not exist. For this reason, when attaching and detaching the upper and lower dustproof nets 21 and 22, they are not caught by the fins and tubes constituting the oil cooler 13, so that the oil cooler 13 can be safely attached and detached without damaging it. It will be possible.

  In the above-described embodiment, the heat exchanger installed in the engine room 6 is the radiator 12 and the oil cooler 13, but as shown in FIGS. 5 and 6, in addition to these heat exchangers, There is a configuration in which the intercooler 30 is mounted upstream of the oil cooler 13 in the flow of cooling air by the cooling fan 14. Further, there is a configuration in which a condenser 31 for an air conditioner is mounted at a position further upstream than the intercooler 30 and a battery 32 is disposed in a front space. Here, the intercooler 30 is disposed at the upper position, and the condenser 31 is disposed at the lower position, so that they do not overlap when viewed from the flow direction of the cooling air.

  As described above, the intercooler 30, the capacitor 31, and the battery 32 are disposed in front of the oil cooler 13, and almost the entire surface of the oil cooler 13 is covered with these. Therefore, in the case of such a configuration, even when the dust-proof net 20 divided into two pieces is attached to the oil cooler 13, these members interfere with each other and are taken out to the front side. Can not be installed from. In addition, since the battery 32 is also disposed below the capacitor 31, this battery 32 also becomes an obstacle when the dustproof net 20 is attached or detached.

  Therefore, as shown in FIGS. 7 and 8, a support plate 33 is connected to each of the left and right posts 17, and the capacitor 31 is mounted on the support plate 33 so as to be movable up and down. That is, the operation plate body 34 is connected so as to project from the left and right sides of the capacitor 31, and the engagement protrusion 35 is provided on the operation plate body 34. On the other hand, the support plate 33 is formed with a long hole 36 that forms a passage of the engagement projection 35 of the operating plate 34 so as to have a predetermined length in the vertical direction. Stopper portions 37a and 37b are provided at the position and the lower position, respectively. These stopper portions 37 a and 37 b are configured as passages that are connected to both upper and lower ends of the long hole 36. The upper stopper portion 37a is an end portion of a passage in which the upper end portion of the long hole 36 is folded back into a curved shape, and the lower stopper portion 37b is bent so as to shift the lower end portion of the long hole 36 to the side. It constitutes the end of the passage. The interval of the lateral shift from the long hole 36 to the stopper portion 37a is the same as the interval of the lateral shift to the stopper portion 37b, and the shapes and dimensions of the left and right passages are completely the same.

  With the configuration described above, the capacitor 31 can be moved up and down along the elongated hole 36 of the support plate 33 by the engaging projection 35 provided on the operating plate 34. When the engaging protrusion 35 is lowered and engaged with the stopper portion 37b on the lower side from the long hole 36, the capacitor 31 is disposed at a normal position, and this position is an operating position as the capacitor 31. Further, when the capacitor 31 is lifted and the engaging projection 35 is engaged with the stopper portion 37a from the upper end of the long hole 36, the capacitor 31 becomes a position overlapping the front portion of the intercooler 30, and the lower portion is opened. Open position.

  Therefore, when removing the dustproof net 20, the capacitor 31 is first lifted from the operating position to the open position, and the engaging protrusion 35 of the capacitor 31 is engaged with the stopper portion 37b, thereby fixing the capacitor 31 in a fixed manner. Hold. As a result, the condenser 31 is located at substantially the same height as the intercooler 30, and the lower side at the position where the heat exchanger is disposed is opened forward.

  In this state, the lower dust-proof net 22 is separated from the upper dust-proof net 21 by lifting the lower dust-proof net 22 upward from the height position of the battery 32 with the thumbscrew 29 removed. The lower dustproof net 22 can be taken out by pulling the lower dustproof net 22 obliquely downward. Thereafter, the upper dust-proof net 21 is lifted upward, and the hook 24 is detached from the hook 23 provided on the post 17. The upper dustproof net 21 can also be removed by pulling the upper dustproof net 21 obliquely toward the front side. Therefore, an interval is provided between the oil cooler 13 and the intercooler 30 so that the upper dustproof net 21 can be pulled out.

  As described above, the lower dustproof net 22 and the upper dustproof net 21 can be removed on the ground, and the removed dustproof nets 21 and 22 can be easily cleaned. When the oil cooler 13 is also cleaned at the same time, the entire surface of the oil cooler 13 can be cleaned by inserting a cleaning tool between the oil cooler 13 and the intercooler 30. When cleaning is completed, the upper dust-proof net 21 and the lower dust-proof net 22 can be attached in this order, and then the capacitor 31 can be moved downward to return to the operating position.

1 is a front view of a hydraulic excavator as an example of a construction machine to which a heat exchange device according to the present invention is mounted. It is an internal block diagram of the engine room which shows one embodiment of this invention. FIG. 3 is a plan view of FIG. 2 with the engine room cover omitted. It is a perspective view which shows the state which isolate | separated the oil cooler and the upper dustproof net which comprises a dustproof net, and a lower dustproof net. It is an internal block diagram of the engine room which shows other embodiment in this invention. FIG. 6 is a plan view of FIG. 5 with the engine room cover omitted. It is a front view which shows the vertical movement mechanism of a capacitor | condenser. It is sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 6 Engine room 10 Engine 12 Radiator 13 Oil cooler 14 Cooling fan 17 Post 20 Dust-proof net 21 Upper dust-proof net 22 Lower dust-proof net 21a, 22a Frame 21b, 22b Net 23, 25 Hook 24, 26 Hanging Metal fitting 27 Screw insertion hole 28 Screw hole 20 Thumb screw 30 Intercooler 31 Capacitor 32 Battery

Claims (3)

One or a plurality of unitized heat exchangers installed in the building of a construction machine and cooled by cooling air from a cooling fan, and mounted on the most upstream surface of the cooling air by the cooling fan of the heat exchanger In a heat exchange device equipped with a dustproof net,
The dust-proof net consists of two parts divided vertically.
The upper dustproof net is provided with a hook that is hooked to the hook portion provided at the upper position of the heat exchanger, and the hook portion is attached to the lower side thereof,
Further, the lower dustproof net is provided with a hook that is hooked to a hook portion provided at a lower position of the upper dustproof net, and the lower position of the lower dustproof net is screwed to the lower position of the heat exchanger. A heat exchange device characterized by that. The heat exchanger is supported by posts provided on the left and right sides thereof, and both posts are provided with hook portions on which the hooks of the upper dustproof net are hooked at the upper positions, and at the lower positions. The heat exchange device according to claim 1, wherein a screw hole into which a screw for fixing the lower position of the lower dustproof net is screwed is provided. The heat exchange device according to claim 2, wherein the screw for fastening the lower dustproof net is a wing screw.

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