JP2009068819A - Cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device capable of preventing the risk of hot air from intruding into a heat exchanging core from outside when a cooling fan is stopped. <P>SOLUTION: An air conditioning condenser 18 is equipped with the heat exchanging core 19, an electric condenser fan 20 disposed on one side of the core 19, and a louver type shutter 21 disposed on the other side of the core 19. The louver type shutter 21 is controlled to open and close by an opening/closing control part 22 by being interlocked with the operation and stopping of the condenser fan 20. By controlling rotary amount of a servomotor, the opening/closing control part 22 converts the rotary amount into linear momentum of a link 28 by a motion converter. By the interlocking action of the link 28, each mounting ear part 24 of the louver type shutter 21 is rotated around a shaft member 26 and the angle of a shutter body part 23 is controlled. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling device having a cooling fan.

  In a cooling device having a direct-acting cooling fan, the effective flow obstruction area in the flow of the cooling fluid toward the cooling surface of the heat exchanger is expanded as the temperature of the fluid decreases, so that the cooling fluid exchanges heat. Some have a flow gate device that reduces the contact with the cooling surface of the vessel (see, for example, Patent Document 1).

  On the other hand, as shown in FIG. 7, on the upper swing body 11 of the excavator, a radiator cooled by an engine 14 and an engine direct-acting engine fan 15 is provided behind the cab 12 and the working device 13. An engine cooling package 16 and an air conditioning capacitor 18 surrounded by a partition wall 17 are arranged.

  As shown in FIG. 8, the air conditioning condenser 18 is provided with an electric condenser fan 20 on a heat exchange core 19.

  Then, the exhaust heat discharged from the engine cooling package 16 flows to the front of the airframe by the engine fan 15 as indicated by an arrow a in FIG. During the cooling operation of the air conditioning, the condenser fan 20 exhausts heat from the air conditioning condenser 18 as shown by the arrow b in FIG.

When the air-conditioning cooling function is stopped, not only when the air-conditioning power supply is turned off, but also for temperature control during automatic operation and prevention of freezing in the air-conditioning unit, the condenser fan 20 stops in conjunction. When the condenser fan 20 is stopped, a part of the hot air discharged to the front of the aircraft through the engine 14 as shown by an arrow a in FIG. 7 flows backward through the core 19 of the air conditioning condenser 18 as shown by an arrow c. There is a risk of penetration and intrusion so as to be sucked into the engine cooling package 16 behind the fuselage.
Japanese Patent Laid-Open No. 5-65823 (first page, FIG. 1)

  Thus, in the air conditioning capacitor 18, hot air from the engine may flow back to the heat exchange core when the cooling fan is stopped.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a cooling device that can prevent the possibility of hot air from entering the core for heat exchange from the outside when the cooling fan is stopped.

  The invention described in claim 1 is a heat exchange core, a cooling fan disposed on one side of the core, an openable / closable shutter disposed on the other side of the core, and the operation and stop of the cooling fan. And an opening / closing control unit that controls opening / closing of the shutter in conjunction with the shutter.

  According to a second aspect of the present invention, the shutter in the cooling device according to the first aspect is a rotatable louver type shutter, and the open / close control unit includes a servo motor for controlling the angle of the louver type shutter. It is.

  According to the first aspect of the present invention, the cooling fan is disposed on one side of the core and the shutter that can be opened and closed on the other side, and the shutter is opened and closed by the opening / closing control unit in conjunction with the operation and stop of the cooling fan. Since the control is performed, it is possible to reliably prevent the hot air from entering the heat exchange core by closing the shutter when the cooling fan is stopped.

  According to the second aspect of the present invention, the angle of the louver type shutter is controlled by the servo motor of the opening / closing control unit. Therefore, even when the outside air suction position differs depending on the airframe or the like, the louver type shutter in the half-open state is optimal. The suction direction can be controlled and the cooling efficiency of the core can be improved.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 5 and another embodiment shown in FIG.

  FIG. 1 shows an air conditioning condenser 18 as a cooling device. The air conditioning condenser 18 includes a heat exchange core 19 and a condenser fan 20 as an electric cooling fan disposed on one side of the core 19. A rotatable louver type shutter 21 as an openable and closable shutter disposed on the other side of the core 19, and an open / close control unit that controls opening and closing of the louver type shutter 21 in conjunction with the operation and stop of the condenser fan 20 And 22.

  The louver-type shutter 21 has a triangular mounting ear 24 bent at one end and the other end of the shutter main body 23, and the vicinity of the bent portion of the upper part of the mounting ear 24 is A shaft member 26 pivotally supports the mounting plates 25 attached to the left and right sides of the core 19, respectively.

  A common link 28 is rotatably connected to the distal end portion of the mounting ear portion 24 of each louver-type shutter 21 by a shaft member 27.

  As shown in FIG. 2, the opening / closing control unit 22 includes a servo motor 31 that controls the angle of the louver shutter 21, a lever 33 fitted to the output shaft 32 of the servo motor 31, A motion converter 34 for converting the reverse rotation operation into the reciprocating operation of the link 28.

  The servo motor 31 moves while the current is supplied, stops when the current supply is stopped, and reverses by reversing + and-, so that the lever 33 can be fixed at an arbitrary angular position. . The movement of the servo motor 31 is transmitted to the louver type shutter 21 through the link 28 and the like, and the amount of rotation of the lever 33 is controlled to control the opening / closing of each louver type shutter 21 and the outside air suction direction. And done.

  As the motion converter 34, the link type shown in FIG. 2 may be used, and the tip of the lever 33 is not shown in the drawing to fit and slide with a guide (not shown) provided horizontally at the lower part of the link 28. A slider type may be used.

  Next, the function and effect of the embodiment shown in FIGS. 1 and 2 will be described with reference to FIGS.

  The opening / closing controller 22 controls the operating angle of the lever 33 by controlling the amount of rotation of the servo motor 31, and controls the linear momentum of the link 28 via the motion converter 34. The mounting ear portion 24 of each louver-type shutter 21 is rotated with the shaft member 26 as a fulcrum, and the angle of the shutter main body portion 23 is controlled.

  The louver type shutter 21 is controlled to be fully closed as shown in FIG. 3 in conjunction with the cooling function off when the condenser fan 20 is stopped, and the louver is interlocked with the cooling function activated when the condenser fan 20 is operated. The mold shutter 21 is controlled to the half-open state as shown in FIG. 4 or to the fully-open state as shown in FIG.

  In this way, the condenser fan 20 is disposed on one side of the core 19 and the louvered shutter 21 that can be opened and closed on the other side, and the louvered shutter 21 is opened and closed in conjunction with the operation and stop of the condenser fan 20. Therefore, when the condenser fan 20 is stopped, the louver shutter 21 is closed to prevent the hot air from entering the core 19 for heat exchange.

  That is, in FIG. 7, when the condenser fan 20 stops, the hot air exhausted from the engine compartment to the front of the fuselage passes through the air conditioning capacitor 18 and is caught in the adjacent engine cooling package 16. This can be prevented by the 18 louver shutters 21.

  In addition, the servomotor 31 can arbitrarily control the angle of the louver shutter 21 as shown in FIG. 4 to fix the angle in the half-open state, and the outside air suction position differs depending on the airframe. The louver shutter 21 can control the optimum suction direction.

  In this way, the servo motor 31 of the opening / closing control unit 22 controls the angle of the louver-type shutter 21 to adjust the direction of sucking in the outside air. The optimum suction direction can be controlled by 21 and the cooling efficiency of the core 19 can be improved.

  In short, the fully closed function of the louver type shutter 21 eliminates hot air intrusion into the airframe, and the angle control function of the louver type shutter 21 can improve the cooling efficiency of the core 19.

  Next, FIG. 6 shows another embodiment, in which the louver shutter 21 itself has no restriction on the mounting direction, so that the assembly direction of the louver shutter 21 with respect to the core 19 is changed according to the suction direction. It is. The same parts as those of the embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  Since the link 28 is long, the opening / closing control unit 22 may be disposed not at the lowermost part of the link 28 but at the center of the link 28. In addition, a slide-type shutter may be used in place of the louver-type shutter 21 if only opening / closing control is sufficient.

  The present invention can be used for a cooling device suitable for an air conditioner of a work machine such as a hydraulic excavator.

It is a disassembled perspective view which shows one Embodiment of the cooling device which concerns on this invention. It is a front view of the opening / closing control part of a cooling device same as the above. It is a perspective view which shows the fully closed state of a cooling device same as the above. It is a perspective view which shows the half open state of a cooling device same as the above. It is a perspective view which shows the fully open state of a cooling device same as the above. It is a perspective view which shows other embodiment of a cooling device same as the above. It is a schematic plan view which shows the apparatus arrangement structure on the upper revolving body of a hydraulic excavator. It is a perspective view of the conventional capacitor for air conditioning.

Explanation of symbols

18 Air conditioning condenser as a cooling device
19 core
20 Capacitor fan as cooling fan
21 Louver shutter as shutter
22 Open / close control unit
31 Servo motor

Claims (2)

A core for heat exchange;
A cooling fan arranged on one side of the core;
An openable / closable shutter disposed on the other side of the core;
A cooling apparatus comprising: an opening / closing control unit that controls opening / closing of the shutter in conjunction with the operation and stop of the cooling fan. The shutter is a rotatable louvered shutter,
The open / close control unit
The cooling device according to claim 1, further comprising a servo motor that controls an angle of the louvered shutter.

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