JP2006316694A - Cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device improving cooling efficiency of a cooling package without increasing noise by a cooling fan. <P>SOLUTION: Auxiliary cooling means 14 is provided on an opposite side of a cooling fan 13 via the cooling package 12. Cooling air sucked by the cooling fan 13 is supplemented by compressed air from each blasting part 31, 32 blasting cooling air in a direction including same direction composition. Consequently, increase of output of the cooling fan more than necessary and enlargement of the cooling fan are not necessary, and cooling efficiency of the cooling package 12 can be improved without increase of noise of the cooling fan accompanying increase of output and enlargement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooling device including a cooling package for cooling.

  2. Description of the Related Art Conventionally, in a working machine such as a hydraulic excavator, a cooling package having a radiator for cooling cooling water for cooling an engine and an oil cooler for cooling hydraulic oil, and cooling air is supplied to the cooling package. Some have a cooling device equipped with a cooling fan.

  FIG. 3 shows a conventional cooling device. This cooling device has a cooling fan 3 that sucks cooling air from the outside of the airframe 1 on the inner side of the airframe 1 with respect to the cooling package 2 disposed in the airframe 1. The cooling fan 3 is arranged and driven by an engine (not shown) or a hydraulic pressure source.

  However, in such a cooling device, it is necessary to increase the number of rotations of the cooling fan 3 or to increase the size of the cooling fan 3 in order to obtain a desired cooling capacity of the cooling package 2. There is a risk that noise from the cooling fan 3 will increase.

  Further, the cooling by the cooling fan 3 has a large and small air volume depending on the position. For example, as shown in FIG. 3, the air volume on the center side of the cooling fan 3 is smaller than that on the outer peripheral side. For this reason, the cooling of the cooling package 2 may be uneven.

Therefore, a cooling device including a plurality of nozzles for blowing compressed air from a pump driven by an engine or the like onto a cooling package instead of a cooling fan for cooling is known (for example, see Patent Document 1). .
JP-A-9-287450 (page 3-5, FIG. 1)

  However, in the above-described cooling device, although noise due to the cooling fan can be suppressed, with respect to cooling, since compressed air is only blown from the nozzle to the cooling package, it is not easy to obtain sufficient cooling efficiency. Have.

  The present invention has been made in view of these points, and an object of the present invention is to provide a cooling device that improves the cooling efficiency of a cooling package without increasing noise from a fan.

  According to the first aspect of the present invention, there is provided a cooling package for cooling, a fan for sucking cooling air through the cooling package, and an auxiliary capable of blowing compressed air from an air pressure source from the upstream side of the cooling air to the cooling package. A cooling device comprising cooling means and control means for detecting information related to the temperature of the cooling package and adjusting the air volume of compressed air blown from the auxiliary cooling means to the cooling package in response to the detected information It is.

  According to a second aspect of the present invention, in the cooling device according to the first aspect, the control means detects a temperature of the fluid to be cooled in the cooling package, and an air pressure supplied from the air pressure source to the auxiliary cooling means. And a controller for adjusting the relief set pressure of the variable relief valve in accordance with the temperature detected by the temperature sensor.

  According to a third aspect of the present invention, in the cooling device according to the first or second aspect, the auxiliary cooling means can change the direction in which the compressed air is blown onto the cooling package.

  According to a fourth aspect of the present invention, in the cooling device according to the first or second aspect, the auxiliary cooling means has a plurality of spray holes and is provided in a long shape along the edge of the cooling package. A movable spraying part and a drive mechanism for rotating the spraying part are provided.

  According to a fifth aspect of the present invention, in the cooling device according to the fourth aspect, the spray portion has a plurality of spray holes and is provided in an elongated shape in the width direction of the cooling package above the fan, and in the vertical direction. An upper spraying part that can rotate, and a lower spraying part that has a plurality of spraying holes and is provided in a long shape in the width direction of the cooling package below the fan and that can rotate in the vertical direction. The drive mechanism has a motor connected to one of the upper spraying part and the lower spraying part, and a belt body wound around the upper spraying part and the lower spraying part. .

  According to the first aspect of the present invention, information related to the temperature of the cooling package is detected by the control means, and compressed air from the air pressure source is sucked by the auxiliary cooling means by the fan according to the detected information. By blowing the cooling air from the upstream side to the cooling package, the cooling air sucked by the fan is supplemented by the compressed air blown from the auxiliary cooling means to increase the fan output more than necessary or to increase the size of the fan. Therefore, it is possible to improve the cooling efficiency of the cooling package while suppressing the generation of noise due to an increase in output of the cooling fan and an increase in size.

  According to the second aspect of the present invention, the relief set pressure of the variable relief valve is adjusted by the controller in accordance with the temperature of the fluid to be cooled detected by the temperature sensor, and supplied from the air pressure source to the auxiliary cooling means. The air pressure to be changed can be varied in accordance with the temperature of the fluid to be cooled, so that overcooling of the fluid to be cooled can be prevented and the cooling efficiency of the cooling package can be improved.

  According to the invention described in claim 3, uneven cooling of the cooling package can be suppressed by making the blowing direction of the compressed air to the cooling package by the auxiliary cooling means variable.

  According to the fourth aspect of the present invention, the blowing portion provided in an elongated shape along the edge of the cooling package is rotated at a fixed position by the driving mechanism, so that the compressed air is blown from the plurality of blowing holes. The mounting direction can be changed in the vicinity of the edge of the cooling package where the cooling air from the fan is likely to be insufficient, and cooling unevenness of the cooling package can be suppressed.

  According to the invention of claim 5, the motor is connected to either one of the long upper spraying part in the width direction of the cooling package and the long lower spraying part in the width direction of the cooling package, By winding the belt body around the upper spraying part and the lower spraying part, when one of the spraying parts is rotated by the motor, the other of the spraying parts is rotated in conjunction with the belt body. Therefore, the direction of the spray hole of each spray part can be easily changed in conjunction with each other with a simple configuration of the motor and the belt body, and cooling from the fan is achieved by the upper spray part and the lower spray part. Compressed air can be blown onto the cooling package in the vicinity of the edge of the cooling package above and below the fan where air is likely to be insufficient, and cooling unevenness of the cooling package can be reliably suppressed.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.

  FIG. 1 shows a cooling device 11 that is mounted in the body of a work machine (not shown). The cooling device 11 is provided on a side opposite to the cooling fan 13 with the cooling package 12 for cooling, the cooling fan 13 as a fan provided facing the cooling package 12 and the cooling package 12 interposed therebetween. The auxiliary cooling means 14 and the control means 15 for controlling the driving of the auxiliary cooling means 14 and the cooling fan 13 are provided.

  As shown in FIGS. 1 and 2, the cooling package 12 is formed in a thin rectangular parallelepiped shape so that one main surface side as a front surface faces the outside of the airframe and the other main surface side as a back surface faces the inside of the airframe. It is arranged. The cooling package 12 includes at least an oil cooler 21 that cools hydraulic oil as a fluid to be cooled, and a radiator 22 that cools engine coolant as a fluid to be cooled. The oil cooler 21 and the radiator 22 Are adjacent to each other in the front-rear direction of the cooling package 12, that is, in the up-down direction shown in FIG.

  The cooling fan 13 is driven by an engine or a hydraulic pump / motor (not shown). The cooling fan 13 is disposed on the back side of the cooling package 12, and sucks outside air through the cooling package 12 by being driven. The heat exchange of the hydraulic oil that passes through the oil cooler 21 and the cooling water that passes through the radiator 22 is promoted.

  The auxiliary cooling means 14 is located on the upstream side of the cooling air sucked by the cooling fan 13 and is connected to the air pressure source 26 via the pipe 25. The auxiliary cooling means 14 is supplied from the air pressure source 26 via the pipe 25. A rotatable spray part 27 that sprays the compressed air on the front surface of the cooling package 12 and a drive mechanism 28 that rotates the spray part 27 are provided.

  The air pressure source 26 is, for example, a compressor that is constantly driven by a hydraulic pump / motor, or a compressor that directly obtains power from the engine PTO.

  The spray unit 27 includes a pipe-shaped upper spray unit 31 disposed above the cooling fan 13 and a pipe-shaped lower spray unit 32 disposed below the cooling fan 13. .

  The upper spray portion 31 is provided in a long shape in the width direction of the cooling package 12 along the upper edge portion of the front surface of the cooling package 12 that is outside or in the vicinity of the outer periphery of the cooling fan 13, and is shown in FIG. In addition to being connected to 25, an upper spray hole 35 as a plurality of spray holes is formed on the rear side, which is the cooling package 12 side, spaced apart in the longitudinal direction. Further, the right end portion shown in FIG. 2 which is one end portion of the upper spray portion 31 is pivotally supported in the vicinity of the upper end of the columnar body 36 provided on the side of the cooling package 12, and is shown in FIG. 2 which is the other end portion. The left end portion is pivotally supported by a shaft support body 37 provided on the opposite side to the columnar body 36 via the cooling package 12, and is rotatable in the vertical direction.

  The lower blowing portion 32 is provided in a long shape in the width direction of the cooling package 12 along the lower edge portion of the front surface of the cooling package 12 that is outside or in the vicinity of the outer periphery of the cooling fan 13, and is shown in FIG. In addition to being connected to the pipe 25, a lower spray hole 41 as a plurality of spray holes is formed in the rear side, which is the cooling package 12 side, spaced apart in the longitudinal direction. That is, the lower spray part 32 is disposed so as to be substantially parallel to the upper spray part 31. Further, the right end portion shown in FIG. 2 as one end portion of the lower spraying portion 32 is pivotally supported in the vicinity of the lower end of the columnar body 36, and the left end portion shown in FIG. 2 as the other end portion is connected to the drive mechanism 28. Thus, it can be turned in the vertical direction.

  The drive mechanism 28 includes a motor 45 connected to the left end portion of the lower spray portion 32, and a belt body 46 wound around the upper spray portion 31 and the lower spray portion 32.

  The motor 45 rotates the lower spraying part 32 in the vertical direction, and its drive is controlled by the control means 5 so that it can be rotated forward and backward.

  The belt body 46 is disposed in the vicinity of the left end portions of the both blowing portions 31 and 32 and on the left side of the cooling package 12, and transmits the rotation of the lower blowing portion 32 in the vertical direction by the motor 45 to the upper blowing portion 31. The upper spray portion 31 is rotated in the vertical direction in conjunction with the vertical rotation of the lower spray portion 32.

  The control means 15 includes a variable relief valve 51 disposed in the pipe 25, a controller 52 connected to the solenoid 51a of the variable relief valve 51 to control the set pressure of the variable relief valve 51, and the temperature of the cooling package 12. The temperature sensor 53 detects the temperature of the hydraulic oil of the oil cooler 21 that is information related to the oil temperature sensor 53, and the temperature sensor detects the temperature of the cooling water of the radiator 22 that is information related to the temperature of the cooling package 12 As a water temperature sensor 54.

  The variable relief valve 51 sets an upper limit value of the air pressure supplied from the air pressure source 26, and the relief set pressure of the spring 51b can be variably controlled by changing the magnetic force of the solenoid 51a.

  The controller 52 controls the rotation of the cooling fan 13, or via an electrical signal according to at least one of the temperature of the hydraulic oil detected by the oil temperature sensor 53 and the temperature of the cooling water detected by the water temperature sensor 54. The relief set pressure of the variable relief valve 51 is variably controlled to adjust the amount of compressed air blown from the blowing holes 35 and 41 of the blowing portions 31 and 32, and the like.

  Next, the function and effect of the embodiment will be described.

  When the work machine is driven, the cooling device 11 is driven along with this drive.

  That is, the controller 52 rotates the cooling fan 13 at a constant speed, sucks the outside air through the cooling package 12 as cooling air, and detects the temperature of the hydraulic oil detected by the oil temperature sensor 53 and the cooling water detected by the water temperature sensor 54. If necessary, the relief set pressure of the variable relief valve 51 is variably controlled via an electrical signal in accordance with at least one of the temperatures of the desired temperature and the desired pressure from the blowing holes 35 and 41 of the blowing parts 31 and 32. Compressed air is blown onto the front surface of the cooling package 12 with a blowing air volume of.

  Specifically, when the controller 52 determines that cooling is not necessary at the initial stage of machine operation based on the outputs from the sensors 53 and 54, the controller 52 maximizes the output current value and opens the variable relief valve 51. By doing so, the compressed air from the air pressure source 26 is released into the atmosphere to prevent overcooling.

  On the other hand, when the controller 52 determines that the temperature of the hydraulic oil or the cooling water rises due to the output from the sensors 53 and 54 and the cooling is necessary, the controller 52 decreases the output current value. The relief set pressure by the spring 51b of the variable relief valve 51 is increased to increase the air pressure from the air pressure source 26, and the amount of blowing air from each of the blowing holes 35 and 41 is increased to increase the cooling efficiency.

  Further, when the controller 52 determines that the temperature of the hydraulic oil or the cooling water has decreased due to the outputs from the sensors 53 and 54, the controller 52 increases the output current value so that the variable relief valve 51 The relief setting pressure by the spring 51b is lowered to lower the air pressure from the air pressure source 26, and the amount of blowing air from each of the blowing holes 35 and 41 is reduced to suppress the cooling efficiency.

  As described above, according to the above-described embodiment, each of the cooling air sucked by the cooling fan 13 is blown by the auxiliary cooling means 14 by blowing it to the cooling package 12 from the upstream side of the cooling air by the cooling fan 13. The cooling package 12 can be reliably cooled without increasing the output of the cooling fan 13 or increasing the size of the cooling fan 13 by making up with compressed air from the parts 31, 32, and increasing the output of the cooling fan 13 and increasing the size. It is possible to improve the cooling efficiency of the cooling package 12 while suppressing the generation of noise due to the conversion.

  Moreover, by providing the auxiliary cooling means 14 on the opposite side of the cooling fan 13 via the cooling package 12, the cooling fan 13 and the auxiliary cooling means 14 do not interfere with each other.

  Further, the controller 52 adjusts the relief set pressure of the variable relief valve 51 in accordance with at least one of the temperature of the hydraulic oil detected by the oil temperature sensor 53 and the temperature of the cooling water detected by the water temperature sensor 54. As a result, the air pressure supplied from the air pressure source 26 to the auxiliary cooling means 14 can be varied according to the temperature of at least one of the hydraulic oil and the cooling water, The cooling water can be prevented from being overcooled, and when the hydraulic oil or cooling water needs to be cooled, the cooling water is sufficiently cooled to eliminate the cooling shortage, and the cooling efficiency of the cooling package 12 can be improved.

  Furthermore, by making the direction in which the compressed air is sprayed onto the cooling package 12 by the auxiliary cooling means 14 variable, the cooling unevenness of the cooling package 12 can be suppressed.

  Specifically, the motor 45 is connected to the lower spraying part 32, and the lower spraying part 32 is rotated by the motor 45 by winding the belt body 46 around the upper spraying part 31 and the lower spraying part 32. Then, since the upper spraying portion 31 is rotated in conjunction with the belt body 46, the directions of the spraying holes 35 and 41 of the respective spraying portions 31 and 32 are interlocked with each other with a simple configuration of the motor 45 and the belt body 46. The cooling package 12 near the edge of the cooling package 12 above and below the cooling fan 13 where the cooling air from the cooling fan 13 tends to be insufficient. Compressed air can be sprayed to the cooling package 12, and uneven cooling of the cooling package 12 can be reliably suppressed.

  Moreover, the cooling air by the cooling fan 13 can easily pass between the respective blowing parts 31 and 32, and the cooling efficiency by the cooling air sucked by the cooling fan 13 is not lowered.

  In the above-described embodiment, the adjustment mechanism for the amount of compressed air blown from each of the blowing holes 35 and 41 of each of the blowing portions 31 and 32 is provided with a variable throttle in each of the blowing holes 35 and 41, for example. Various other configurations, such as those in which the opening / closing amount of the diaphragm is controlled by the control means 15, can be applied.

  Further, the blowing part 27 of the auxiliary cooling means 14 can be provided at a part where the air volume of the cooling fan 13 is likely to be insufficient, for example, on both sides of the cooling fan 13 when viewed from the front.

  Further, the spraying portion 27 of the auxiliary cooling means 14 can be configured not only to rotate at a fixed position but also to move with respect to the cooling package 12 using, for example, a guide rail.

  The spraying portion 27 of the auxiliary cooling means 14 can have various configurations other than the above configuration. In this case, according to the shape of the cooling package 12, the size of the cooling fan 13, etc., it is preferable to provide the blowing part 27 at a position where the cooling air sucked by the cooling fan 13 is difficult to hit.

  In addition, the drive mechanism 28 has various other configurations such as a configuration in which each of the blowing units 31 and 32 is driven by a separate motor or the like, a configuration that is interlocked by a gear, and a configuration that is interlocked by a link. It is possible.

  Further, the controller 52 compares, for example, a plurality of preset temperature threshold values of hydraulic oil and a plurality of temperature threshold values of cooling water with output current values from the sensors 53 and 54, and sets the relief set pressure of the variable relief valve 51. It is also possible to make the control variable in steps.

  The information relating to the temperature of the cooling package 12 detected by the control means 15 includes, for example, the cooling water temperature of the engine such as the engine speed when the cooling fan 13 is driven by the engine PTO, or the operating oil. It is possible to use various other information other than the temperature.

It is a circuit diagram showing one embodiment of a cooling device concerning the present invention. It is a description perspective view which shows a cooling device same as the above. It is an explanatory top view which shows the cooling device of a prior art example.

Explanation of symbols

11 Cooling device
12 Cooling package
13 Cooling fan as a fan
14 Auxiliary cooling means
15 Control means
26 Air pressure source
27 Spraying part
28 Drive mechanism
31 Upper spraying part
32 Lower spray part
35 Upper spray hole as spray hole
41 Lower spray hole as spray hole
45 Motor
46 Belt body
51 Variable relief valve
52 Controller
53 Oil temperature sensor as temperature sensor
54 Water temperature sensor as temperature sensor

Claims (5)

A cooling package for cooling;
A fan that sucks cooling air through this cooling package;
Auxiliary cooling means capable of blowing compressed air from an air pressure source to the cooling package from the upstream side of the cooling air;
And a control unit that detects information related to the temperature of the cooling package and adjusts the amount of compressed air blown from the auxiliary cooling unit to the cooling package in response to the detected information. apparatus. The control means
A temperature sensor for detecting the temperature of the fluid to be cooled in the cooling package;
A variable relief valve for setting the air pressure supplied from the air pressure source to the auxiliary cooling means;
The cooling device according to claim 1, further comprising: a controller that adjusts a relief setting pressure of the variable relief valve in accordance with the temperature detected by the temperature sensor. The cooling device according to claim 1 or 2, wherein the auxiliary cooling means is capable of changing a direction in which the compressed air is blown onto the cooling package. Auxiliary cooling means
A plurality of spray holes provided in an elongated shape along the edge of the cooling package, and capable of rotating at a fixed position;
The cooling device according to claim 1, further comprising a drive mechanism that rotates the spray portion. The spraying part
An upper spraying part that has a plurality of spraying holes and is provided in an elongated shape in the width direction of the cooling package above the fan, and rotatable in the vertical direction;
It has a plurality of spray holes and is provided in a long shape in the width direction of the cooling package below the fan, and has a lower spray part that can rotate in the vertical direction,
The drive mechanism is
A motor connected to one of the upper spraying part and the lower spraying part;
The cooling device according to claim 4, further comprising a belt body wound around the upper spraying portion and the lower spraying portion.

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