JP2007247465A - Cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system capable of easily cleaning between a plurality of heat exchanger cores, capable of maintaining cooling performance, and superior in space efficiency to a swing-out structure. <P>SOLUTION: One heat exchanger core 23 positioned on the front side (the outside surface side) is movably arranged between an approaching position and a separating position, while holding a parallel attitude by four L-shaped cross-sectional guide rails 25, to the other heat exchanger core 21 positioned on the back face side (the engine side). When operating the cooling system 10, cooling efficiency is improved, by increasing the air volume passing through the front side heat exchanger core 23, by approaching a separate distance of the front side heat exchanger core 23 to the back face side heat exchanger core 21. In cleaning, the front side heat exchanger core 23 is slid forward by a guide of a plurality of guide rails 25, and the cleaning is performed by an air jet, by inserting a cleaning fluid jetting nozzle into an expanded clearance, by expanding the clearance between the heat exchanger core 21 and the heat exchanger core 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooling device that is easy to clean.

  As shown in FIG. 11, a hydraulic excavator 1 as a work machine is provided with an upper swing body 3 as a machine body capable of turning relative to a lower traveling body 2, and the upper swing body 3 includes a work device 4, a cab 5, and the like. Further, a counterweight 7 is provided at the rear of these via a power chamber 6, and in the power chamber 6, cooling for cooling the engine 8, the muffler 9, engine cooling water, hydraulic oil, engine intake air, and the like. A device 10 or the like is provided. A hood cover (not shown) for covering the upper parts of the engine 8, the muffler 9, the cooling device 10 and the like is provided at the upper part of the power chamber 6.

  As shown in FIG. 12, the cooling device 10 includes a radiator 11 for cooling engine coolant, an oil cooler 12 for cooling hydraulic circuit hydraulic oil, an intercooler for cooling engine intake air (air-to-air after cooler). : ATAAC) 13 and a cooling package 15 in which a plurality of heat exchanger cores such as a condenser 14 for an air conditioner are gathered, and a cooling fan 16 for cooling the cooling package 15 by air.

  The cooling fan 16 is an axial flow type or diagonal flow type fan that is circularly arranged on the engine side of the cooling package 15 and surrounded by a shroud 17. When the cooling fan 16 is rotationally driven by the engine 8 or the like, Then, the outside air is sucked from the air supply opening 18a opened to the radiator room 18, and the outside air is drawn out through each heat exchanger core such as the radiator 11 and the oil cooler 12 of the cooling package 15, and each heat is generated by the air flow. Cool the exchanger core.

  When taking outside air from the air supply opening 18a, dust such as sand and mud, dust, fallen leaves, and insects may be mixed with the outside air. These dusts or the like block the front surface of the heat exchanger core of the cooling package 15 and adhere to the fins, thereby deteriorating the cooling performance and eventually causing the engine 8 to overheat.

  Therefore, in order to reduce the mixing of these dusts and the like, a screen 19 such as a dustproof net is provided on the front surface of the heat exchanger core such as the radiator 11 to reduce the suction of dust and the like.

  If the radiator room 18 has enough space, as shown in FIG. 13, the radiator room 18 is located on the front side with respect to the heat exchanger core such as the radiator 11 located on the rear side when viewed from the operator outside the machine body. The heat exchanger cores such as the oil cooler 12 and the air conditioning condenser 14 can swing out around the hinge 20 on one side, so that each heat exchange of the radiator 11, the oil cooler 12 and the air conditioning condenser 14 etc. Some have a structure that improves the cleanability of the container core and is easier to maintain.

  In other words, the heat exchanger core on the front side located on the outside of the cooling package 15 is provided so as to be able to swing out, and the heat exchanger core located on the back side is opened to the outside by rotating this to the front side. Making it easier to clean.

Furthermore, an oil cooler is arranged on the front side of the radiator, an intercooler is arranged on the front side of the oil cooler, and an air conditioning condenser is installed to be movable in the vertical direction by rails arranged in parallel to the front side of the intercooler. A fuel cooler is installed so as to be movable in the vertical direction by rails arranged in parallel to the front side of the air conditioning condenser to improve the cooling capacity and facilitate the cleaning workability (for example, Patent Document 1). reference).
Japanese Patent Laying-Open No. 2005-120979 (page 4-5, FIG. 3-4)

  The cooling package in which a plurality of heat exchanger cores of the radiator, oil cooler, and intercooler described in Patent Document 1 are overlapped can remove dust accumulated in a gap between these heat exchanger cores by cleaning. Have difficulty.

  When cleaning air nozzles are inserted into the gaps between these heat exchanger cores during cleaning, these cleaning air nozzles are mistakenly used as heat dissipation fins for heat exchanger cores (aluminum fins that have good thermal conductivity but are soft and easily deformed). There is a risk of contact damage.

  Therefore, as a design standard, if a clearance of 100 mm or more is provided between these heat exchanger cores, damage to the heat exchanger core can be prevented, but strict design conditions such as component layout are forced accordingly.

  Furthermore, since the gap provided between the heat exchanger core on the front side and the heat exchanger core on the back side is opened, air is directly sucked into the heat exchanger core on the back side from the gap, The efficiency of sucking air into the heat exchanger core on the front side is deteriorated, the amount of cooling air passing through the heat exchanger core on the front side is reduced, and the cooling performance is deteriorated.

  In addition, the swing-out structure to improve the cleanability cannot be installed unless it is a model that can secure the space of the radiator room that can swing out the heat exchanger core on the front side. Expensive compared to the formula structure.

  Thus, if the gap between the front-side heat exchanger core and the rear-side heat exchanger core is small, cleaning by inserting a cleaning nozzle is difficult, whereas if the gap is large, the front-side heat exchanger is The cooling performance is inferior due to the deterioration of the efficiency of air suction into the core, and the swing-out structure has a problem that the models that can be mounted are limited.

  The present invention has been made in view of the above points, and provides a cooling device that can easily clean a plurality of heat exchanger cores, maintain cooling performance, and is more space efficient than a swing-out structure. With the goal.

  The invention according to claim 1 is provided so as to be movable between an approach position and a separation position while maintaining a parallel posture with respect to the one flat heat exchanger core and the one heat exchanger core. The cooling device includes the other flat heat exchanger core.

  According to a second aspect of the present invention, in the cooling device according to the first aspect, a plurality of guide rails for guiding the other heat exchanger core in the contact / separation direction with respect to one heat exchanger core are provided.

  A third aspect of the present invention is the cooling apparatus according to the first aspect, comprising a plurality of link levers that rotate with respect to one heat exchanger core and move the other heat exchanger core in the contact / separation direction. It is.

  According to a fourth aspect of the present invention, in the cooling device according to any one of the first to third aspects, the one heat exchanger core is disposed side by side with the radiator that cools the engine coolant, and the hydraulic circuit hydraulic fluid is disposed side by side with the radiator. And an oil cooler for cooling.

  According to the first aspect of the invention, during operation, the other heat exchanger core is provided at an approaching position with respect to one heat exchanger core, thereby ensuring the passing air volume of the other heat exchanger core. Decreasing the cooling performance can be prevented, and at the time of cleaning, the other heat exchanger core is provided at a separated position with respect to one heat exchanger core, thereby expanding the gap between these heat exchanger cores. The cleaning nozzle inserted in the gap can efficiently clean and remove accumulated dust and the like without damaging the heat exchanger core, and the other heat exchanger core is separated while maintaining a parallel posture. Because it moves to the position, it is more space efficient than the swing-out structure.

  According to the second aspect of the present invention, the other heat exchanger core can be moved in the contact / separation direction along a plurality of guide rails having a simple structure.

  According to the invention described in claim 3, by rotating a plurality of link levers, not only the gap in the contact / separation direction of the other heat exchanger core with respect to one heat exchanger core changes, but also the overlapping position. Since it changes, the superposition | polymerization site | part of one heat exchanger core covered with the other heat exchanger core is open | released, and it can clean easily.

  According to invention of Claim 4, a radiator and the oil cooler arrange | positioned side by side on this radiator can be efficiently cleaned and removed on equivalent conditions.

  Hereinafter, the first embodiment shown in FIGS. 1 and 2, the second embodiment shown in FIGS. 3 to 6, and the third embodiment shown in FIGS. Details will be described with reference to FIG. The hydraulic excavator 1 shown in FIG. 11 is used as a work machine equipped with the cooling device 10 according to the present invention.

  First, the first embodiment shown in FIGS. 1 and 2 will be described. The cooling device 10 is viewed from an operator who performs maintenance work from the outside facing the upper swing body 3 shown in FIG. A cooling package 15 is disposed on the front side, and a cooling fan 16 is provided on the rear side, that is, on the engine 8 side with respect to the cooling package 15.

  This cooling device 10 has a flat shape located on the front side (outer side) as viewed from the worker, with respect to one flat heat exchanger core 21 located on the back side (engine side) as seen from the worker. The other heat exchanger core 23 is provided so as to be movable between an approach position and a separation position while maintaining a parallel posture.

  One heat exchanger core 21 has a first heat exchanger core 21a formed in a planar shape and a second heat exchanger core 21b formed in a planar shape arranged side by side on the inside of the frame 24. Four L-shaped guide rails 25 are perpendicular to one heat exchanger core 21 by an L-shaped mounting plate 26 from the frame 24 to the side opposite to the cooling fan 16. And projecting so as to be parallel to each other.

  The other heat exchanger core 23 is slidably fitted in these guide rails 25 and guided in the contact / separation direction with respect to the one heat exchanger core 21. These guide rails 25 are provided with screw insertion holes 27 for fixing the other heat exchanger core 23 approaching the one heat exchanger core 21 to the position thereof.

  One heat exchanger core 21 includes a first heat exchanger core 21a and a second heat exchanger core 21b, and the first heat exchanger core 21a is, for example, a radiator that cools engine coolant. The second heat exchanger core 21b is, for example, an oil cooler that cools hydraulic oil in a hydraulic circuit. The other heat exchanger core 23 is, for example, an intercooler (air to air after cooler: ATAAC) that cools high-temperature engine intake air compressed by a turbocharger, or an air conditioner that cools refrigerant in an air conditioning circuit It is a capacitor.

  Next, the operation of this embodiment will be described.

  During operation, as shown in FIG. 1, the air flow passing through the heat exchanger core 23 on the front side is reduced by reducing the distance of the heat exchanger core 23 on the front side from the heat exchanger core 21 on the back side. Increase cooling efficiency. Thereby, it is not necessary to design for ensuring a clearance of 100 mm or more between the heat exchanger cores in order to consider the cleaning workability as before.

  At the time of cleaning, as shown in FIG. 2, the heat exchanger core 23 on the front side is slid forward by the guides of a plurality of guide rails 25, and one heat exchanger core 21 and the other heat exchanger core 23 are It is also possible to set a conventional clearance of 100 mm or more here, by inserting a cleaning fluid jet nozzle into this enlarged clearance, and one heat exchanger core 21 is placed on the front side. The other heat exchanger core 23 is cleaned from the back side and the front side by an air jet or the like.

  Next, the effect of this embodiment will be described.

  During operation of the cooling device 10, the other heat exchanger core 23 is brought close to the one heat exchanger core 21 to secure the amount of air passing through the other heat exchanger core 23, and this heat exchange The deterioration of the cooling performance of the vessel core 23 can be prevented. At this time, the other heat exchanger core 23 can be easily held at the approach position by the plurality of guide rails 25 having a simple structure and the screws inserted into the insertion holes 27.

  During the cleaning operation, the gap between the heat exchanger cores 21 and 23 is expanded by moving the other heat exchanger core 23 to the separated position with respect to the one heat exchanger core 21. The possibility that the cleaning fluid ejection nozzle inserted into the heat exchanger cores 21 and 23 will hit the heat exchanger cores 21 and 23 and damage their fins is reduced, and the accumulated dust can be easily and efficiently removed by air jets. In short, even in a complicated place where a plurality of heat exchanger cores are stacked, the cleaning work can be easily performed, and the cleaning workability is improved. In particular, the first heat exchanger core 21a and the second heat exchanger core 21b located on the back side can be efficiently cleaned and removed under the same conditions.

  Since the other heat exchanger core 23 moves to the separation position shown in FIG. 2 while maintaining the parallel posture, the space efficiency is superior to the conventional swing-out structure. In other words, the radiator room space that was previously required for swinging out becomes unnecessary, improving the degree of freedom of layout, and even if the swingout structure is impossible due to layout, it is easy by expanding the gap. It is possible to improve the cleaning workability.

  Next, a second embodiment shown in FIGS. 3 to 6 will be described. Parts similar to those of the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  The link ends of the four link levers 31 are pivotally attached to the frame 24 of one heat exchanger core 21 by pins 32 so that these link levers 31 are parallel to each other. The other heat exchanger core 23 is pivotally supported at the tip of the lever 31 by a pin 33.

  That is, the plurality of link levers 31 rotate with respect to one heat exchanger core 21 and move in the contact / separation direction while moving the other heat exchanger core 23 in the vertical direction. The heater core 23 is movable between the approach position shown in FIGS. 3 and 4 and the separated position shown in FIGS. 5 and 6 while maintaining a parallel posture with respect to the one heat exchanger core 21. Is provided.

  An L-shaped upper locking plate 34 bent inward from the upper side surface is attached to the frame 24 of one heat exchanger core 21, and an L-shaped lower engagement member bent forward from the lower front surface. A stop plate 35 is attached. A part of the lower locking plate 35 slightly protrudes from the side surface of the frame 24. On the other hand, a fixing plate 36 that is fixed to the upper locking plate 34 projects from the upper portion of the other heat exchanger core 23. As shown in FIG. 5, screw insertion holes 37 and 38 are formed in the upper locking plate 34 and the fixing plate 36, respectively. These screw insertion holes 37 and 38 are formed in FIGS. 3 and 4, respectively. As shown, a screw 39 is inserted and fixed by screwing with a nut.

  Next, the operation of this embodiment will be described.

  When the cooling device 10 is in operation, the heat exchanger core 23 on the front side is raised and the fixing plate 36 is fixed to the upper locking plate 34 with screws 39 as shown in FIGS. Then, the gaps between the heat exchanger core 21 on the back side and the heat exchanger core 23 on the front side are made closer to each other. As a result, the suction force of the cooling fan 16 (FIG. 11) installed on the back side of the heat exchanger core 21 is efficiently passed to the front side heat exchanger core 23 through the back side heat exchanger core 21. As a result, the amount of air passing through the heat exchanger core 23 on the front side is increased, and the cooling efficiency is improved.

  At the time of cleaning, the screw 39 is removed, and the heat exchanger core 23 on the front side is lowered as shown in FIGS. 5 and 6, and the lower link lever 31 is moved to the protruding portion of the lower locking plate 35. The gap between the one heat exchanger core 21 and the other heat exchanger core 23 is expanded by locking by. Accordingly, a cleaning fluid ejection nozzle (not shown) is inserted into a gap larger than the conventionally required gap, and one heat exchanger core 21 is cleaned from the front side by an air jet or the like, while the other The heat exchanger core 23 is cleaned from the front side and the back side by an air jet or the like.

  As described above, when the heat exchanger core 23 on the front side is moved in the vertical direction by the link mechanism, the heat exchanger core 23 is also displaced in the front-rear direction, and is lowered until the link lever 31 is perpendicular to the frame 24. Then, the gap between the heat exchanger core 21 and the heat exchanger core 23 is maximized, and when the link lever 31 is raised until the frame 24 is folded, the gap between the heat exchanger core 21 and the heat exchanger core 23 is minimized. Therefore, the gap between the cores can be adjusted by the vertical displacement of the heat exchanger core 23, and it is designed to ensure a sufficient gap between the heat exchanger cores in order to obtain cleaning workability as in the past. There is no need.

  Furthermore, by rotating the plurality of link levers 31, not only the gap in the contact / separation direction of the other heat exchanger core 23 with respect to one heat exchanger core 21 changes, but also the overlapping position also changes. The polymerization site of one heat exchanger core 21 covered by the heat exchanger core 23 can be opened and cleaned easily.

  Next, the third embodiment shown in FIGS. 7 to 10 will be described. The same parts as those in the second embodiment shown in FIGS. 3 to 6 are denoted by the same reference numerals, and the description thereof is omitted.

  An L-shaped upper locking plate 34 bent inward from the upper side surface is attached to the frame 24 of one heat exchanger core 21, and a lower locking plate 35 protruding forward from the lower front surface is attached. ing.

  A fixing plate 36 fixed by an upper locking plate 34 projects from the upper portion of the other heat exchanger core 23, and the upper locking plate 34 and the fixing plate 36 are screwed as shown in FIG. Insertion holes 37 and 38 are formed, and screws 39 are inserted into these insertion holes 37 and 38 as shown in FIGS. 7 and 8 and screwed into the nuts.

  Further, as shown in FIGS. 7 and 8, screw insertion holes 41 and 42 are formed in the lower link lever 31 and the lower locking plate 35, respectively. As shown in FIGS. 9 and 10, a screw 43 is inserted and fixed with a nut.

  Then, when the cooling device 10 is in operation, as shown in FIGS. 7 and 8, the heat exchanger core 23 on the front side is raised, and the fixing plate 36 is fixed to the upper locking plate 34. The gap between the heat exchanger core 21 on the back side and the heat exchanger core 23 on the front side is brought close to the minimum. As a result, the amount of air passing through the heat exchanger core 23 on the front side is increased, and the cooling efficiency is improved.

  Further, during the cleaning operation, as shown in FIGS. 9 and 10, the heat exchanger core 23 on the front side is lowered and the lower link lever 31 is fixed to the lower locking plate 35 with the screw 43. Therefore, since it is possible to enlarge the gap between the heat exchanger core 21 on the back side and the heat exchanger core 23 on the front side to the maximum, a cleaning fluid ejection nozzle is inserted into the enlarged gap, One heat exchanger core 21 is cleaned from the front side by an air jet or the like, and the other heat exchanger core 23 is similarly cleaned from the front side and the back side by an air jet or the like.

  At this time, by fixing the lower link lever 31 to the lower locking plate 35, the stability at the time of blowing an air jet or the like to the front heat exchanger core 23 is ensured.

  As described above, when the heat exchanger core 23 is moved in the vertical direction by the link mechanism, the heat exchanger core 23 is also displaced in the front-rear direction, and when the link lever 31 is perpendicular to the frame 24, the heat exchanger core 23 Since the clearance between the heat exchanger cores 21 and 23 is minimized when the link lever 31 is folded into the frame 24, the front side can be obtained. The amount of cooling air passing through the heat exchanger core 23 is maximized, excellent cooling performance is obtained, and furthermore, a space-efficient swing-out structure is not required.

  Next, another embodiment (not shown) will be described. The structure for moving the heat exchanger core 23 on the front side in the front-rear direction is not limited to the rail structure or the link structure. For example, the heat exchanger core 23 on the front side may be automatically moved by a cylinder mechanism or a feed screw mechanism.

  Furthermore, automation is advanced and the temperature of the to-be-cooled fluid which has passed each heat exchanger core 21 and 23 is detected using a temperature sensor (not shown), and according to the temperature of these to-be-cooled fluids A mechanism for operating the heat exchanger core 23 on the front side in the front-rear direction may be provided. In this mechanism, by controlling the displacement of the heat exchanger core 23 on the front side in the front-rear direction according to the temperature sensor, the balance of the amount of air passing through each heat exchanger core 21, 23 can be adjusted. With this adjustment, it is possible to control the cooling efficiency balance between the heat exchanger core 21 on the back side and the heat exchanger core 23 on the front side.

  For example, if the heat exchanger core 23 on the front side is brought closer to the heat exchanger core 21 on the rear side, the amount of air passing through the heat exchanger core 23 on the front side increases, cooling efficiency can be improved, and When the exchanger core 23 is moved away from the heat exchanger core 21 on the back side, the suction force of the cooling fan acting on the heat exchanger core 23 on the front side is weakened, so the amount of air passing through the heat exchanger core is reduced. Cooling efficiency can be suppressed.

  In this way, the heat exchanger core 23 on the front side is attached to the heat exchanger core 21 on the rear side so that the displacement in the front-rear direction can be obtained within the space-saving range, and the front surface is required as needed when cleaning the core. If the side heat exchanger core 23 can be easily moved manually or automatically, the cooling capacity and the cleaning workability can be improved.

It is a perspective view at the time of normal operation which shows 1st Embodiment of the cooling device which concerns on this invention. It is a perspective view at the time of cleaning which shows 1st Embodiment same as the above. It is a perspective view at the time of normal operation which shows 2nd Embodiment of the cooling device which concerns on this invention. It is a side view at the time of normal operation which shows 2nd Embodiment same as the above. It is a perspective view at the time of cleaning which shows 2nd Embodiment same as the above. It is a side view at the time of cleaning which shows 2nd Embodiment same as the above. It is a perspective view at the time of normal operation which shows 3rd Embodiment of the cooling device which concerns on this invention. It is a side view at the time of normal operation which shows 3rd Embodiment same as the above. It is a perspective view at the time of cleaning which shows 3rd Embodiment same as the above. It is a side view at the time of cleaning which shows 3rd Embodiment same as the above. It is the perspective view which opened a part of work machine. It is a side view which shows the conventional cooling device. It is a perspective view which shows the conventional cooling device.

Explanation of symbols

10 Cooling device
21 One heat exchanger core
23 The other heat exchanger core
25 Guide rail
31 Link lever

Claims (4)

One flat heat exchanger core,
The other heat exchanger core having a flat shape is provided so as to be movable between an approach position and a separation position while maintaining a parallel posture with respect to the one heat exchanger core. apparatus. The cooling apparatus according to claim 1, further comprising a plurality of guide rails for guiding the other heat exchanger core in the contact / separation direction with respect to the one heat exchanger core. The cooling device according to claim 1, further comprising a plurality of link levers that rotate with respect to one heat exchanger core and move the other heat exchanger core in a contact / separation direction. One heat exchanger core
A radiator for cooling the engine coolant,
The cooling device according to any one of claims 1 to 3, further comprising an oil cooler that is arranged side by side on the radiator and cools the hydraulic fluid in the hydraulic circuit.

Images