JP2020007051A - Construction machine - Google Patents

Abstract

To provide a construction machine having a mechanism capable of suppressing discharge of a drain water outside from an air conditioner for a cabin in a saved installation space.SOLUTION: A construction machine of the present invention comprises: a cabin on which an operator boards; and an air conditioner for the cabin having a discharge pipe of a drain water. The construction machine also comprises: a drain water tank for storing the drain water discharged from the discharge pipe; a drain water reusing device for reusing the drain water in the drain water tank; a drain water level sensor arranged in the drain water tank and capable of detecting that a certain amount or more of the drain water is stored in the drain water tank; and a controller for controlling the supply volume of the drain water in the drain water tank to the drain water reusing device on the basis of the detected result by the drain water level sensor.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a construction machine.

  For example, construction machines such as cranes, hydraulic shovels, and pile drivers are generally provided with a lower traveling body having traveling means such as crawlers and tires, and are provided on the lower traveling body so as to be capable of turning horizontally, and the boom can be raised and lowered. And an upper rotating body attached to the vehicle. Further, a cabin on which the operator boards is provided on the upper revolving superstructure, and the operator boarding the cabin operates the construction machine.

  In order to improve the operation environment of the operator, a cabin air conditioner is usually installed in the cabin. The cabin air conditioner controls the room temperature in the cabin and performs dehumidification, and the water collected by dehumidification of the cabin is discharged from the discharge pipe as drain water.

  In particular, the amount of drain water may be large enough to flow down, for example, a frame of a lower traveling body in summer, for example. It is difficult to distinguish traces of water that has flowed down the frame from oil leaks and water leaks of the construction machine itself. Work efficiency may be reduced.

  The construction machine is equipped with various devices, and the space for installing a new mechanism for treating the drain water is limited. For this reason, the problem that the drain water flows down the frame of the lower traveling body or the like is avoided by laying out the drain pipe so as to discharge the drain water to a position where the drain water does not flow down. (See, for example, JP-A-2013-189890).

  However, even if the discharge pipe is laid out in this way, the discharge position is still immediately below or near the construction machine. At the work site, the ground surface is often a concrete surface or a laid iron plate surface in consideration of the posture stability of the construction machine, so that traces of water due to drain water easily remain on the ground. For this reason, it cannot be said that oversight of the failure of the construction machine due to the trace of the drain water or reduction in the work efficiency can be sufficiently reduced only by the contrivance based on the layout.

JP 2013-189890 A

  The present invention has been made in view of the above circumstances, and has an object to provide a construction machine having a mechanism capable of suppressing drain water from a cabin air conditioner from being discharged to the outside in a small installation space. I do.

  The invention made in order to solve the above-mentioned problem is a construction machine including a cabin on which an operator is boarded and a cabin air conditioner having a drain water discharge pipe, wherein the drain water discharged from the discharge pipe is discharged. A drain water tank for storing, a drain water recycling device for reusing the drain water in the drain water tank, and a drain water tank, wherein a certain amount or more of drain water is stored in the drain water tank. A drain water level sensor capable of detecting the drain water level sensor, and a control device for controlling a supply amount of the drain water of the drain water tank to the drain water recycling device based on a detection result of the drain water level sensor.

  Since the construction machine is provided with the drain water tank, drain water from the cabin air conditioner can be prevented from being directly discharged from the construction machine to the outside. Further, the construction machine includes the drain water reuse device, the drain water level sensor, and the control device. When a certain amount of drain water is stored in the drain water tank by the control device, the construction machine supplies the drain water to the drain water recycling device. It is hard to be. Therefore, the construction machine can suppress direct discharge of drain water from the construction machine to the outside with a small installation space.

  It is preferable that a bottom surface of the drain water tank is disposed below the discharge pipe in a side view. By arranging the bottom surface of the drain water tank below the discharge pipe in a side view as described above, the drain water discharged from the discharge pipe can be stored without being sent by a pump or the like. it can. Therefore, the installation space can be further reduced.

  It is preferable that the drain water tank is disposed below the cabin. Normally, the cabin air conditioner is arranged near the cabin, so by disposing the drain water tank below the cabin, the length of the discharge pipe from the cabin air conditioner to the drain water tank is reduced. Can be shorter.

  An engine, a radiator that cools the engine heated by heat exchange with cooling water that is a mixture of water and a coolant liquid, and a cooling water tank that stores the cooling water, wherein the drain water recycling device is A coolant liquid tank for storing a coolant liquid, a drain water supply pump for supplying the drain water of the drain water tank to the cooling water tank, and a coolant liquid supply for supplying the coolant liquid of the coolant liquid tank to the cooling water tank And a pump. The radiator cooling water gradually decreases as it is used for heat exchange. Therefore, by using the drain water as the cooling water for the radiator, the drain water from the cabin air conditioner is prevented from being directly discharged from the construction machine to the outside, and is used as the cooling water for the radiator. The number of times of water supply can be reduced.

  The drain water recycling device is provided in the coolant tank, and a coolant level sensor that can detect that a certain amount or more of coolant is stored in the coolant tank, and is provided in the coolant tank. A cooling water level sensor capable of detecting that a predetermined amount or more of cooling water is stored in the cooling water tank, wherein the control device detects the coolant liquid level sensor and the cooling water level sensor. The drain water supply pump and the coolant supply pump may be controlled based on the result. By controlling the drain water supply pump and the coolant supply pump by the control device while monitoring the amounts of water in the coolant tank and the coolant tank using the water level sensor in this manner, the ratio of the coolant to the coolant is controlled. Can be adjusted, so that the cooling water can be easily prepared in the construction machine.

  An engine and a heat exchanger with the engine, wherein the drain water recycling device injects the drain water from the drain water tank into the heat exchanger, and the drain water from the drain water tank to the heat exchanger. It is preferable to have a drain water supply pump for supplying to the injection device. By injecting the drain water into the heat exchanger in this way, the heat of vaporization enhances the cooling effect of the heat exchanger, and the drain water from the cabin air conditioner is directly discharged from the construction machine to the outside. Can be suppressed.

  The heat exchanger is a radiator that cools the engine heated by the cooling water, and the drain water recycling device detects that the temperature of the cooling water supplied to the radiator is equal to or higher than a certain temperature. A temperature sensor may be further provided, and the control device may control the injection of the drain water from the injection device based on a detection result of the cooling water temperature sensor. As described above, by controlling the injection of the drain water based on the detection result of the cooling water temperature sensor, the radiator can be cooled at an appropriate timing.

  The heat exchanger is an oil cooler that cools the hydraulic oil of the engine, and the drain water recycling device further includes a hydraulic oil temperature sensor that detects that the temperature of the hydraulic oil is equal to or higher than a certain temperature. The controller may control the injection of the drain water from the injector based on the detection result of the hydraulic oil temperature sensor. By controlling the injection of the drain water based on the detection result of the hydraulic oil temperature sensor, the oil cooler can be cooled at an appropriate timing.

  The heat exchanger is an intercooler that cools air taken by the engine, and the drain water recycling device further includes an intake air temperature sensor that detects that the intake air temperature to the engine is equal to or higher than a predetermined temperature. The controller may control the injection of the drain water from the injector based on the detection result of the intake air temperature sensor. As described above, by controlling the injection of the drain water based on the detection result of the intake air temperature sensor, the intercooler can be cooled at an appropriate timing.

  The drain water recycling device has a spray device that sprays the drain water of the drain water tank into the cabin in a mist form, and a drain water supply pump that supplies the drain water of the drain water tank to the spray device. Good to do. By injecting the drain water in the drain water tank into the cabin in the form of mist in this way, the temperature in the cabin is maintained, particularly in summer, and the drain water from the cabin air conditioner is directly discharged from the construction machine to the outside. Can be suppressed.

  The drain water recycling device further includes a room temperature sensor for detecting that the room temperature in the cabin is equal to or higher than a predetermined temperature, and the control device performs the spraying based on a detection result of the room temperature sensor. The injection of drain water from the device may be controlled. By controlling the injection of the drain water based on the detection result of the room temperature sensor in this manner, the inside of the cabin can be cooled at an appropriate timing.

  As described above, the construction machine of the present invention has a mechanism capable of suppressing drain water from the cabin air conditioner from being discharged to the outside in a small installation space. Therefore, in the construction machine, it is difficult to overlook a failure of the construction machine due to the trace of the drain water and to reduce the work efficiency.

FIG. 1 is a schematic side view of a construction machine according to one embodiment of the present invention. FIG. 2 is a schematic perspective view showing the upper swing body of the construction machine shown in FIG. FIG. 3 is a block diagram showing control of the drain water treatment of FIG. FIG. 4 is a schematic perspective view showing an upper swing body different from FIG. FIG. 5 is a block diagram showing control of the drain water treatment of FIG. FIG. 6 is a schematic perspective view showing an upper swing body different from FIGS. 2 and 4. FIG. 7 is a block diagram showing control of the drain water treatment of FIG.

[First embodiment]
Hereinafter, a construction machine according to one embodiment of the present invention will be described with reference to the drawings.

  The construction machine shown in FIGS. 1 and 2 is a lower traveling body 1 capable of self-running, an upper revolving body 2 provided on the lower traveling body 1 so as to be capable of turning horizontally, and an upper and lower revolving body 2 And a crane attachment 3 attached to the main body.

(Lower traveling body)
The lower traveling body 1 mainly has a car body that supports the upper revolving superstructure 2 and traveling means attached to the car body. Examples of the traveling means include crawlers and tires.

[Crane attachment]
The crane attachment 3 is, for example, a part for directly hanging a load and working. The crane attachment 3 has a configuration in which a hook is attached to the tip of a lattice boom, for example.

(Upper revolving structure)
The upper swing body 2 includes a cabin 4 on which an operator rides, a cabin air conditioner 5, an engine 6, a radiator 7 for cooling the engine 6, and a cooling water tank 8 for storing cooling water supplied to the radiator 7. Prepare.

  The cabin air conditioner 5 is an air conditioner that controls the room temperature in the cabin 4. As the cabin air conditioner 5, a known air conditioner can be used. The cabin air conditioner 5 may be a separate type air conditioner divided into an indoor unit and an outdoor unit, or may be an integrated air conditioner. The cabin air conditioner 5 has a drain water discharge pipe 5a. The discharge pipe 5a may be provided with a water purification filter for removing impurities and the like from the drain water.

  The radiator 7 cools the engine 6 heated by heat exchange with cooling water. The cooling water is a mixture of water and a coolant liquid.

  As shown in FIGS. 2 and 3, the construction machine includes a drain water tank 9 for storing drain water discharged from a discharge pipe 5 a of the cabin air conditioner 5 in the upper swing body 2, and a drain water tank 9 for the drain water tank 9. A drain water reuse device 10 that reuses water, a drain water level sensor 11 provided in a drain water tank 9, and a control device 12.

<Drain water tank>
The drain water tank 9 is not particularly limited as long as it can store water. For example, a known poly tank or metal tank can be used. It is preferable that the material of the drain water tank 9 is resistant to rust. For example, in the case of a metal tank, it is preferable that the inner surface of the drain water tank 9 be rust-proofed.

  The location of the drain water tank 9 is not particularly limited as long as it does not interfere with the operation of the construction machine, but may be located below the cabin 4. Since the cabin air conditioner 5 is usually disposed near the cabin 4, the drain water tank 9 is disposed below the cabin 4 so that the discharge pipe from the cabin air conditioner 5 to the drain water tank 9 is provided. The length of 5a can be shortened. In addition, the space below the cabin 4 often has a relatively large space, and the capacity of the drain water tank 9 is easily secured.

  Further, it is preferable that the bottom surface of the drain water tank 9 is disposed below the discharge pipe 5a of the cabin air conditioner 5 in a side view. By arranging the bottom surface of the drain water tank 9 below the discharge pipe 5a in a side view, the drain water discharged from the discharge pipe 5a can be stored without being sent by a pump or the like. Can be. Therefore, the installation space can be further reduced.

  The lower limit of the water storage capacity of the drain water tank 9 is preferably 5 L, more preferably 8 L. On the other hand, the upper limit of the water storage capacity of the drain water tank 9 is preferably 15 L, more preferably 12 L. If the storage capacity of the drain water tank 9 is less than the above lower limit, the drain water tank 9 is likely to be full, and the effect of preventing drain water from being discharged to the outside may be insufficient. Conversely, if the storage capacity of the drain water tank 9 exceeds the upper limit, the installation space of the drain water tank 9 may be too large.

<Drain water reuse device>
The drain water reuse device 10 includes a coolant tank 10a for storing a coolant, a drain water supply pump 10b for supplying water from a drain water tank 9 to a cooling water tank 8, and a coolant for the coolant in the coolant tank 10a. It has a coolant supply pump 10c to be supplied to the tank 8, a coolant level sensor 10d provided in the coolant tank 10a, and a coolant level sensor 10e provided in the coolant tank 8.

  The coolant liquid tank 10a is not particularly limited, but may be made of the same material as the drain water tank 9. The location of the coolant liquid tank 10a is not particularly limited as long as it does not interfere with the operation of the construction machine, but is preferably located near the drain water tank 9 for ease of management.

  The capacity of the coolant tank 10 a can be the same as the capacity of the drain water tank 9. The capacity ratio between the drain water tank 9 and the coolant liquid tank 10a may be, for example, 1: 1 depending on the mixing ratio of water and coolant liquid.

  Known pumps can be used as the drain water supply pump 10b and the coolant supply pump 10c. A predetermined amount of drain water and coolant is supplied to the cooling water tank 8 by these pumps. The arrangement positions of the coolant tank 10a and the cooling water tank 8 are not limited, and the cooling water tank 8 may be arranged above the coolant tank 10a.

<Water level sensor>
The drain water level sensor 11 can detect that a certain amount or more of drain water is stored in the drain water tank 9. The coolant level sensor 10d can detect that a certain amount or more of coolant is stored in the coolant tank 10a. The cooling water level sensor 10e can detect that a certain amount or more of cooling water is stored in the cooling water tank 8. These water level sensors are not particularly limited, and known sensors can be used.

<Control device>
The control device 12 controls the drain water supply pump 10b and the coolant liquid supply pump 10c based on the detection results of the drain water level sensor 11, the coolant liquid level sensor 10d, and the cooling water level sensor 10e. Of these, the supply amount of the drain water from the drain water tank 9 to the drain water recycling device 10 is controlled by the control of the drain water supply pump 10b.

  The control device 12 can be constituted by, for example, a control computer. The control computer may be provided exclusively for the control device 12, but for example, an existing computer already mounted on the construction machine may be used.

<Control method by control device>
The control device 12 controls the drain water supply pump 10b and the coolant liquid supply pump 10c by a control method including, for example, a cooling water level sensor confirmation step, a drain water level sensor confirmation step, a coolant liquid level sensor confirmation step, and a pump control step. Can be controlled.

(Cooling water level sensor confirmation process)
In the cooling water level sensor confirmation step, the detection result of the cooling water level sensor 10e is confirmed. The cooling water level sensor 10e can detect that a certain amount or more of cooling water is stored in the cooling water tank 8. When it is detected that a certain amount or more of the cooling water is stored in the cooling water tank 8, the control device 12 determines that it is not necessary to replenish the cooling water, and ends the control. On the other hand, when it is not detected that the cooling water is stored in the cooling water tank 8 in a predetermined amount or more, the control device 12 performs a drain water level sensor checking step.

  In order to perform the cooling water level sensor confirmation process in this way, the cooling water level detected by the cooling water level sensor 10e is supplied by the control device 12 in the pump control process from the volume of the cooling water tank 8 when the cooling water tank 8 is full. The water level is lower than the water level corresponding to the cooling water amount excluding the sum of the volumes of the drain water and the coolant liquid. If the cooling water level detected by the cooling water level sensor 10e is higher than the above-mentioned water level, the cooling water tank 8 may overflow due to the drain water and the coolant liquid supplied in the pump control step.

(Drain water level sensor confirmation process)
In the drain water level sensor confirmation step, the detection result of the drain water level sensor 11 is confirmed. The drain water level sensor 11 can detect that a certain amount or more of drain water is stored in the drain water tank 9. When it is detected that a certain amount or more of the drain water is stored in the drain water tank 9, the control device 12 performs a coolant level sensor confirmation step. On the other hand, when it is not detected that the drain water tank 9 stores a predetermined amount or more of drain water, the control device 12 determines that there is not a sufficient amount of drain water, and ends the control.

  Since the drain water level sensor confirmation step is performed in this manner, the drain water level detected by the drain water level sensor 11 is set higher than the water level corresponding to the drain water amount supplied in the pump control step. If the drain water level detected by the drain water level sensor 11 is lower than the above-mentioned water level, the drain water supplied in the pump control step becomes insufficient, and the mixing ratio between the cooling water and the coolant may not be controlled. There is.

(Coolant liquid level sensor confirmation process)
In the coolant level sensor confirmation step, the detection result of the coolant level sensor 10d is confirmed. The coolant level sensor 10d can detect that a certain amount or more of coolant is stored in the coolant tank 10a. When it is detected that a certain amount or more of the coolant is stored in the coolant tank 10a, the control device 12 performs a pump control process. On the other hand, when it is not detected that a certain amount or more of the coolant is stored in the coolant tank 10a, the control device 12 determines that there is not a sufficient amount of the coolant, and ends the control.

  Since the coolant level sensor checking step is performed as described above, the coolant level detected by the coolant level sensor 10d is higher than the water level corresponding to the coolant level supplied in the pump control step. If the coolant level detected by the coolant level sensor 10d is lower than the above-described level, the coolant supplied in the pump control process becomes insufficient, and the mixing ratio between the coolant and the coolant may not be controlled. There is.

  Note that the order of the cooling water level sensor confirmation step, the drain water level sensor confirmation step, and the coolant liquid level sensor confirmation step is not limited to the above-described order, and may be performed in any order.

(Pump control process)
In the pump control step, the drain water supply pump 10b and the coolant supply pump 10c are operated to supply the drain water and the coolant to the cooling water tank 8. The supply speed and supply time of the drain water supply pump 10b and the coolant supply pump 10c are controlled such that a predetermined amount of drain water and coolant is supplied to the cooling water tank 8 at the same time. By performing such control, the mixing ratio between the cooling water and the coolant liquid can be controlled to a desired ratio. The control device 12 ends the control after supplying the drain water and the coolant liquid.

  In particular, it is preferable that the supply speed and the supply time are controlled such that the drain water and the coolant liquid are started simultaneously and ended simultaneously. By performing such control, the drain water and the coolant liquid are stirred by the force of the drain water and the coolant liquid flowing into the cooling water tank 8, and the concentration is easily made uniform.

  After the control of the control device 12 is completed, the above-described control is repeatedly performed at regular time intervals, for example. Alternatively, the control device 12 may start the control, for example, starting when the cooling water level sensor 10e cannot detect that a certain amount or more of the cooling water is stored in the cooling water tank 8.

〔advantage〕
Since the construction machine is provided with the drain water tank 9, it is possible to prevent the drain water from the cabin air conditioner 5 from being directly discharged from the construction machine to the outside. In addition, the construction machine includes a drain water reuse device 10, a drain water level sensor 11, and a control device 12. When a certain amount of drain water is stored in the drain water tank 9 by the control device 12, the construction machine supplies the drain water to the drain water recycling device 10. Even if it is, it is hard to be full. Therefore, the construction machine can suppress direct discharge of drain water from the construction machine to the outside with a small installation space.

  Further, the construction machine uses the drain water in the drain water tank 9 as cooling water for the radiator 7. The cooling water of the radiator 7 gradually decreases as it is used for heat exchange. Therefore, by using the drain water as the cooling water for the radiator 7, the drain water from the cabin air conditioner 5 is prevented from being directly discharged from the construction machine to the outside, and the cooling water for the radiator 7 is prevented. The number of times of supplying water used for water can be reduced.

  Further, the construction machine monitors the amounts of water in the coolant liquid tank 10a and the cooling water tank 8 by using a water level sensor, and controls the drain water supply pump 10b and the coolant liquid supply pump 10c by the control device 12, so that the cooling water is cooled. Since the ratio of water to coolant can be adjusted, cooling water can be easily prepared in the construction machine.

[Second embodiment]
Hereinafter, a construction machine according to another aspect of the present invention will be described with reference to the drawings.

  As shown in FIGS. 4 and 5, the construction machine includes a cabin 4 on which an operator rides, a cabin air conditioner 5, an engine 6, a heat exchanger 13 for the engine 6, A blower fan 14 is provided between the engine 6 and the heat exchanger 13.

  The construction machine includes a drain water tank 9 for storing drain water discharged from the discharge pipe 5 a of the cabin air conditioner 5 in the upper revolving unit 2, and a drain water recycle for reusing the drain water in the drain water tank 9. The apparatus includes a utilization device 15, a drain water level sensor 11 disposed in the drain water tank 9, and a control device 12. The components other than the heat exchanger 13, the blower fan 14, and the drain water recycling device 15 are configured in the same manner as the construction machine of the first embodiment, and thus are denoted by the same reference numerals and will not be described in detail.

<Heat exchanger>
The heat exchanger 13 includes a radiator 13a that cools the engine 6 heated by the cooling water, an oil cooler 13b that cools hydraulic oil of the engine 6, and an intercooler 13c that cools air taken in by the engine 6.

  The heat exchanger 13 has a number of small tubes having, for example, fins, and may have a known configuration in which heat exchange is performed between a liquid flowing in the small tubes and outside air.

<Blower fan>
The blower fan 14 sucks air through the heat exchanger 13. The heat exchange efficiency of the heat exchanger 13 can be increased by the blower fan 14.

  As the blower fan 14, for example, an axial flow fan, a mixed flow fan, or the like can be used.

<Drain water reuse device>
The drain water recycling device 15 includes an injection device 15a that injects the drain water in the drain water tank 9 to the heat exchanger 13, and a cooling water temperature that detects that the temperature of the cooling water supplied to the radiator 13a is equal to or higher than a certain temperature. A sensor 15b, a hydraulic oil temperature sensor 15c for detecting that the temperature of the hydraulic oil of the engine 6 is equal to or higher than a certain temperature, and an intake air temperature sensor 15d for detecting that the intake air temperature to the engine 6 is equal to or higher than a certain temperature. A drain water supply pump 15e that supplies drain water from the drain water tank 9 to the injection device 15a is provided.

(Injection device)
The injection device 15a is disposed on the opposite side of the heat exchanger 13 from the blower fan 14, that is, on the upstream side in the blower direction.

  The injection device 15a is preferably configured to be able to independently inject drain water into the radiator 13a, the oil cooler 13b, and the intercooler 13c. That is, the injection device 15a preferably has a dedicated injection port for each of the radiator 13a, the oil cooler 13b, and the intercooler 13c. By configuring such that the drain water can be independently injected, cooling suitable for each of the radiator 13a, the oil cooler 13b, and the intercooler 13c can be performed. Here, "independent injection" refers to a configuration in which the on / off of the drain water injection from each injection port can be controlled independently, and a configuration in which the amount of drain water injection from each injection port is set independently. including. This control is performed by the control device 12.

  Further, it is preferable that the ejection device 15a ejects in a mist shape. By spraying in the form of a mist, the cooling effect can be improved by effectively utilizing the heat of vaporization of the drain water, and the drain water injected into the heat exchanger 13 is directly discharged from the construction machine to the outside without being vaporized. Can be suppressed.

(Temperature sensor)
The cooling water temperature sensor 15b is provided at a position where the temperature of the cooling water supplied to the radiator 13a can be measured, for example, at a cooling water pipe in the engine 6. The hydraulic oil temperature sensor 15c is provided at a position where the temperature of the hydraulic oil of the engine 6 can be measured, for example, at a hydraulic oil tank of the engine 6. The intake air temperature sensor 15d is provided at a position where the temperature of the air taken by the engine 6 can be measured, for example, at an intake port of the engine 6. Known temperature sensors can be used as these temperature sensors.

  The cooling water temperature sensor 15b, the working oil temperature sensor 15c, and the intake air temperature sensor 15d preferably have hysteresis. Since these temperature sensors have hysteresis, it is possible to prevent the injection device 15a from being repeatedly turned on and off with a slight temperature change, and control of the injection device 15a is easily stabilized. The hysteresis is preferably 5 ° C. or more and 15 ° C. or less. When the hysteresis is less than the lower limit, the effect of improving the control stability of the injection device 15a may be insufficient. Conversely, if the hysteresis exceeds the upper limit, cooling control of the heat exchanger 13 may be difficult. It is preferable that all the temperature sensors of the cooling water temperature sensor 15b, the working oil temperature sensor 15c, and the intake air temperature sensor 15d have hysteresis, but a configuration in which only some of the temperature sensors have hysteresis may be used.

(Drain water supply pump)
As the drain water supply pump 15e, a known pump can be used. 4 and 5 show a case in which the drain water recycling device 15 includes one drain water supply pump 15e, but the injection device 15a is connected to the radiator 13a, the oil cooler 13b, and the intercooler 13c. When a dedicated injection port is provided, a configuration in which a drain water supply pump 15e is provided for each of the injection ports is also possible.

<Control method by control device>
The control device 12 controls the injection of the drain water from the injection device 15a based on the detection results of the drain water level sensor 11, the cooling water temperature sensor 15b, the hydraulic oil temperature sensor 15c, and the intake air temperature sensor 15d. Specifically, the control device 12 controls the supply amount of the drain water from the drain water tank 9 to the drain water recycling device 15 by controlling the drain water supply pump 15e.

  The control device 12 can control the drain water supply pump 15e by a control method including, for example, a temperature sensor confirmation step, a drain water level sensor confirmation step, and a pump control step.

(Temperature sensor confirmation process)
In the temperature sensor confirmation step, the detection results of the cooling water temperature sensor 15b, the hydraulic oil temperature sensor 15c, and the intake air temperature sensor 15d are confirmed. The cooling water temperature sensor 15b, the working oil temperature sensor 15c, and the intake air temperature sensor 15d can detect that the cooling water temperature, the working oil temperature, and the intake air temperature are equal to or higher than a certain temperature, respectively. The control device 12 specifies a temperature sensor that is equal to or higher than a certain temperature among the cooling water temperature sensor 15b, the hydraulic oil temperature sensor 15c, and the intake air temperature sensor 15d. If there is no corresponding temperature sensor, the control device 12 ends the control. If there is one or more corresponding temperature sensors, the controller 12 performs a drain water level sensor confirmation step.

  In order to perform the temperature sensor confirmation process in this manner, the temperatures detected by the respective temperature sensors are temperatures at which cooling water, hydraulic oil, and intake air need to be cooled. On the other hand, if this temperature is set too low, the heat exchanger 13 may be overcooled. From these viewpoints, the temperature detected by each temperature sensor is, for example, a temperature 20 ° C. lower than the guaranteed temperature value of the engine 6 for cooling water and air to be taken in, and a guaranteed temperature value of an oil machine for hydraulic oil. And a temperature 20 ° C. lower than that.

(Drain water level sensor confirmation process)
In the drain water level sensor confirmation step, the detection result of the drain water level sensor 11 is confirmed. The drain water level sensor 11 can detect that a certain amount or more of drain water is stored in the drain water tank 9. When it is detected that a certain amount or more of drain water is stored in the drain water tank 9, the control device 12 performs a pump control step. On the other hand, when it is not detected that the drain water tank 9 stores a predetermined amount or more of drain water, the control device 12 determines that there is not a sufficient amount of drain water, and ends the control.

  Since the drain water level sensor confirmation step is performed in this manner, the drain water level detected by the drain water level sensor 11 is set higher than the water level corresponding to the drain water amount supplied in the pump control step. If the drain water level detected by the drain water level sensor 11 is lower than the above-mentioned water level, the drain water supplied in the pump control step becomes insufficient, and there is a possibility that a sufficient cooling effect may not be obtained.

  The order of the temperature sensor confirmation step and the drain water level sensor confirmation step is not limited to the above-described order, and the temperature sensor confirmation step may be performed in the reverse order, that is, after the drain water level sensor confirmation step.

(Pump control process)
In the pump control step, the drain water supply pump 15e is operated, the drain water is supplied to the injection device 15a, and the injection device 15a is operated. The supply speed and supply time of the drain water supply pump 15e are controlled such that a predetermined amount of drain water is supplied to the injection device 15a. The injection device 15a injects drain water from an injection port corresponding to the temperature sensor specified in the temperature sensor confirmation step, and generates heat corresponding to the specified temperature sensor among the radiator 13a, the oil cooler 13b, and the intercooler 13c. The exchanger 13 is cooled.

  After the control of the control device 12 is completed, the above-described control is repeatedly performed at regular time intervals, for example. Alternatively, the control device 12 detects that at least one of the cooling water temperature, the hydraulic oil temperature, and the intake air temperature is equal to or higher than a certain temperature by, for example, the cooling water temperature sensor 15b, the hydraulic oil temperature sensor 15c, and the intake air temperature sensor 15d. The control may be started from the start of the control.

〔advantage〕
The construction machine injects drain water into the heat exchanger 13 to enhance the cooling effect of the heat exchanger 13 by the heat of vaporization, and the drain water from the cabin air conditioner 5 flows directly from the construction machine to the outside. Emission can be suppressed.

  Further, the construction machine controls the injection of the drain water based on the detection results of the cooling water temperature sensor 15b, the hydraulic oil temperature sensor 15c, and the intake air temperature sensor 15d, so that the radiator 13a, the oil cooler 13b, and the intercooler 13c. Can be cooled at appropriate timing.

[Third embodiment]
Hereinafter, a construction machine according to yet another embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 6 and 7, the construction machine includes a cabin 4 on which an operator rides, and a cabin air conditioner 5 on the upper swing body 2.

  The construction machine includes a drain water tank 9 for storing drain water discharged from the discharge pipe 5 a of the cabin air conditioner 5 in the upper revolving unit 2, and a drain water recycle for reusing the drain water in the drain water tank 9. The system includes a utilization device 16, a drain water level sensor 11 disposed in the drain water tank 9, and a control device 12. The components other than the drain water reuse device 16 are configured in the same manner as the construction machine of the first embodiment, and thus are denoted by the same reference numerals and detailed description thereof will be omitted.

<Drain water reuse device>
The drain water reuse device 16 includes a spray device 16a that sprays the drain water of the drain water tank 9 into the cabin 4 in a mist state, and a room temperature sensor 16b that detects that the room temperature in the cabin 4 is equal to or higher than a certain temperature. And a drain water supply pump 16c for supplying the drain water of the drain water tank 9 to the spray device 16a.

(Spray device)
As the spray device 16a, a known spray device can be used. The disposition position of the spraying device 16a is preferably above the cabin 4, for example, at the ceiling. By spraying the drain water in a mist form from above in the cabin 4, it is easy to lower the room temperature in the entire cabin 4. Further, the spraying device 16a may be disposed at a position where the mist hits the operator for the purpose of lowering the sensible temperature of the operator.

(Temperature sensor)
The room temperature sensor 16b is provided in the cabin 4 at a position where room temperature can be measured. The position where the room temperature sensor 16b is disposed is preferably a position where the mist from the spray device 16a does not hit. If the mist hits the room temperature sensor 16b, a measurement error from the actual room temperature may increase. A known temperature sensor can be used as the room temperature sensor 16b.

  The room temperature sensor 16b preferably has hysteresis. Since the room temperature sensor 16b has hysteresis, it is possible to prevent the spraying device 16a from being repeatedly turned on and off with a slight temperature change, and control of the spraying device 16a is easily stabilized. The hysteresis is preferably 5 ° C. or more and 15 ° C. or less. If the hysteresis is less than the lower limit, the effect of improving the control stability of the spray device 16a may be insufficient. Conversely, when the hysteresis exceeds the upper limit, it may be difficult to control the room temperature in the cabin 4.

(Drain water supply pump)
As the drain water supply pump 16c, a known pump can be used. The location of the drain water supply pump 16c is not particularly limited, but may be, for example, near the drain water tank 9.

<Control method by control device>
The control device 12 controls the injection of the drain water from the spray device 16a based on the detection result of the room temperature sensor 16b. Specifically, the control device 12 controls the supply amount of the drain water from the drain water tank 9 to the drain water recycling device 16 by controlling the drain water supply pump 16c.

  Further, it is preferable that the control device 12 can directly control on / off switching of the spray device 16a manually by an operator, in addition to the control based on the detection result of the room temperature sensor 16b. By performing the switching control in this way, control according to the operator's bodily sensation can be easily performed. Such switching control can be performed by, for example, a switch installed in the cabin 4. As the above-mentioned switch, a switch capable of switching between ON, OFF, and automatic (control by the room temperature sensor 16b) of the spray device 16a is preferable.

  The control device 12 can control the drain water supply pump 16c by a control method including, for example, an operation condition confirmation step, a drain water level sensor confirmation step, and a pump control step.

(Operation condition confirmation process)
In the operation condition confirmation step, the detection result of the room temperature sensor 16b is confirmed. If a switch for performing manual switching control is provided, the state of the switch is checked.

  A specific description will be given of an example in which a switch that can perform manual switching control is provided. First, the state of the switch is confirmed. When the switch is manually turned off, the control device 12 ends the control. When the switch is manually turned on, the control device 12 performs a drain water level sensor checking step. If the switch is set to automatic control, that is, the control by the room temperature sensor 16b, the detection result of the room temperature sensor 16b is confirmed. The room temperature sensor 16b can detect that the room temperature in the cabin 4 is equal to or higher than a certain temperature. When it is detected that the room temperature in the cabin 4 is equal to or higher than the predetermined temperature, the control device 12 performs a drain water level sensor checking step. On the other hand, when it is not detected that the room temperature in the cabin 4 is equal to or higher than the certain temperature, the control device 12 ends the control.

  If the manual switching control does not include the selection to manually turn on, the confirmation of the off state and the detection result of the room temperature sensor 16b are performed manually. Similarly, when there is no manual selection of the OFF state, the ON state is manually confirmed and the detection result of the room temperature sensor 16b is performed. If there is no manual switching control, only the detection result of the room temperature sensor 16b is performed.

  In order to perform the operation condition checking step in this way, the temperature detected by the room temperature sensor 16b is set to a temperature at which room temperature in the cabin 4 needs to be cooled, for example, 28 ° C. Note that this temperature may be variable, and may be manually set by an operator, for example.

(Drain water level sensor confirmation process)
In the drain water level sensor confirmation step, the detection result of the drain water level sensor 11 is confirmed. The drain water level sensor 11 can detect that a certain amount or more of drain water is stored in the drain water tank 9. When it is detected that a certain amount or more of the drain water is stored in the drain water tank 9, the control device 12 performs a pump control step. On the other hand, when it is not detected that the drain water tank 9 stores a predetermined amount or more of drain water, the control device 12 determines that there is not a sufficient amount of drain water, and ends the control.

  Since the drain water level sensor confirmation step is performed in this manner, the drain water level detected by the drain water level sensor 11 is set higher than the water level corresponding to the drain water amount supplied in the pump control step. If the drain water level detected by the drain water level sensor 11 is lower than the above-mentioned water level, the drain water supplied in the pump control step is insufficient, and the cooling effect is insufficient due to the injection of the drain water from the spray device 16a. There is a possibility that.

  Note that the order of the operation condition confirmation step and the drain water level sensor confirmation step is not limited to the above-described order, and the operation condition confirmation step may be performed in the reverse order, that is, after the drain water level sensor confirmation step.

(Pump control process)
In the pump control step, the drain water supply pump 16c is operated to supply drain water to the spray device 16a, and the spray device 16a is operated. The supply speed and supply time of the drain water supply pump 16c are controlled so that a predetermined amount of drain water is supplied to the spray device 16a. The spray device 16a injects drain water from the injection port, and cools the cabin 4.

  After the control of the control device 12 is completed, the above-described control is repeatedly performed at regular time intervals, for example. Alternatively, the control device 12 starts the control based on, for example, that the room temperature in the cabin 4 is detected to be equal to or higher than a predetermined temperature by the room temperature sensor 16b or that the cabin 4 is turned on by manual switching control. You may.

〔advantage〕
The construction machine keeps the temperature in the cabin 4 particularly in summer by injecting the drain water in the drain water tank 9 in a mist state into the cabin 4, and the drain water from the cabin air conditioner 5 is used for the construction machine. Can be prevented from being directly discharged to the outside.

  In addition, the construction machine can cool the inside of the cabin 4 at an appropriate timing by controlling the injection of the drain water based on the detection result of the cold room temperature sensor 16b.

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the above-described embodiment, it is possible to omit, substitute, or add the components of each part of the above-described embodiment based on the description of the present specification and the common technical knowledge, and all of them are interpreted as belonging to the scope of the present invention. Should.

  In the above embodiment, when drain water is used as cooling water for the radiator (first embodiment), when drain water is used for cooling the heat exchanger (second embodiment), drain water is used for cooling the cabin. Although the case of using (third embodiment) is described individually, these configurations are not exclusive, and two or more types can be used at the same time.

  In the above embodiment, the case where the detection result of the drain water level sensor is used to determine whether or not the supply amount required for the drain water reuse device can be ensured has been described, but the method of using the detection result is not limited to this. . For example, the detection result of the drain water level sensor may be used to determine whether or not the drain water tank is full, and the drain water tank may be configured to be used by the drain water recycling device before the drain water tank becomes full. The present invention also contemplates a configuration in which a plurality of drain water level sensors are used and the control device uses a plurality of detection results (for example, the above-described results of securing the supply amount and detecting that the drain water tank is full).

  In the first embodiment, the case where the cooling water level sensor and the coolant liquid level sensor are used has been described. However, one or both of these water level sensors may be omitted. For example, when both the water level sensors are omitted, the control device can control the supply amount to the drain water reuse device using only the detection result of the drain water level sensor.

  In the second embodiment, the case where the radiator, the oil cooler, and the intercooler are cooled by the drain water as the heat exchanger has been described. However, the heat exchanger cooled by the drain water is not limited to this. That is, one or two of the radiator, the oil cooler, and the intercooler may be cooled, or another type of heat exchanger may be cooled. Therefore, the heat exchanger is not limited to one including all of the radiator, the oil cooler, and the intercooler.

  In the second embodiment, the case where the cooling water temperature sensor, the hydraulic oil temperature sensor, and the intake air temperature sensor are used has been described. However, some or all of these temperature sensors may be omitted. For example, a temperature sensor related to a heat exchanger that is not cooled by drain water can be omitted. Further, even if the cooling target is the drain water, the corresponding temperature sensor can be omitted, and the supply amount to the drain water recycling device can be controlled using, for example, only the detection result of the drain water level sensor.

  Similarly, in the third embodiment, the room temperature sensor can be omitted.

  The construction machine of the present invention has a mechanism capable of suppressing drain water from the cabin air conditioner from being discharged to the outside in a small installation space. Therefore, in the construction machine, it is difficult to overlook a failure of the construction machine due to the trace of the drain water and to reduce the work efficiency.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving structure 3 Crane attachment 4 Cabin 5 Cabin air conditioner 5a Discharge pipe 6 Engine 7 Radiator 8 Cooling water tank 9 Drain water tank 10 Drain water recycling device 10a Coolant liquid tank 10b Drain water supply pump 10c Coolant Liquid supply pump 10d Coolant liquid level sensor 10e Cooling water level sensor 11 Drain water level sensor 12 Controller 13 Heat exchanger 13a Radiator 13b Oil cooler 13c Intercooler 14 Blower fan 15 Drain water recycling device 15a Injector 15b Cooling water temperature sensor 15c Hydraulic oil temperature sensor 15d Intake air temperature sensor 15e Drain water supply pump 16 Drain water reuse device 16a Spray device 16b Room temperature sensor 16c Drain water supply pump

Claims (11)

A construction machine including a cabin on which an operator rides, and a cabin air conditioner having a drain pipe for drain water,
A drain water tank for storing the drain water discharged from the discharge pipe,
A drain water reuse device that reuses the drain water in the drain water tank,
A drain water level sensor disposed on the drain water tank and capable of detecting that a certain amount or more of drain water is stored in the drain water tank,
A construction device comprising: a control device that controls a supply amount of drain water of the drain water tank to the drain water recycling device based on a detection result of the drain water level sensor.   The construction machine according to claim 1, wherein a bottom surface of the drain water tank is disposed below the discharge pipe in a side view.   The construction machine according to claim 1, wherein the drain water tank is disposed below the cabin. An engine, a radiator that cools the engine heated by heat exchange with cooling water that is a mixture of water and a coolant liquid, and a cooling water tank that stores the cooling water,
The drain water recycling device is
A coolant tank for storing coolant,
A drain water supply pump that supplies drain water of the drain water tank to the cooling water tank,
4. The construction machine according to claim 1, further comprising a coolant supply pump configured to supply a coolant in the coolant tank to the coolant tank. 5. The drain water recycling device is
A coolant liquid level sensor disposed in the coolant tank and capable of detecting that a certain amount or more of the coolant is stored in the coolant tank;
A cooling water level sensor disposed on the cooling water tank and capable of detecting that a certain amount or more of cooling water is stored in the cooling water tank;
5. The construction machine according to claim 4, wherein the control device controls the drain water supply pump and the coolant liquid supply pump based on detection results of the coolant liquid level sensor and the cooling water level sensor. 6. An engine and a heat exchanger with the engine,
The drain water recycling device is
An injection device for injecting the drain water from the drain water tank to the heat exchanger,
The construction machine according to claim 1, further comprising: a drain water supply pump configured to supply drain water of the drain water tank to the injection device. The heat exchanger is a radiator for cooling the engine heated by the cooling water,
The drain water recycling apparatus further includes a cooling water temperature sensor that detects that a temperature of the cooling water supplied to the radiator is equal to or higher than a certain temperature,
The construction machine according to claim 6, wherein the control device controls the injection of the drain water from the injection device based on a detection result of the cooling water temperature sensor. The heat exchanger is an oil cooler that cools hydraulic oil of the engine,
The drain water recycling device further includes a hydraulic oil temperature sensor that detects that the temperature of the hydraulic oil is equal to or higher than a certain temperature,
The construction machine according to claim 6, wherein the control device controls the injection of the drain water from the injection device based on a detection result of the hydraulic oil temperature sensor. The heat exchanger is an intercooler that cools air taken by the engine,
The drain water recycling device further includes an intake air temperature sensor that detects that an intake air temperature to the engine is equal to or higher than a certain temperature,
The construction machine according to claim 6, wherein the control device controls the injection of the drain water from the injection device based on a detection result of the intake air temperature sensor. The drain water recycling device is
A spray device for injecting the drain water of the drain water tank into the cabin in a mist state,
4. The construction machine according to claim 1, further comprising: a drain water supply pump configured to supply drain water of the drain water tank to the spray device. 5. The drain water reuse device further includes a room temperature sensor for detecting that the room temperature in the cabin is equal to or higher than a certain temperature,
The construction machine according to claim 10, wherein the control device controls the injection of the drain water from the spray device based on a detection result of the room temperature sensor.

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