JP2004353567A - Engine enclosure device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine enclosure device capable of preventing the possibility of an inflammable fluid reaching a hot heating part in an engine room. <P>SOLUTION: This engine enclosure device comprises an enclosure 32 surrounding the engine 31 having the hot heating part, cooling air inlet ports 51 opened in a part of the enclosure 32, a cooling fan 41 installed oppositely to the outside of the cooling air inlet ports 51, and an air direction control mechanism 35 controlling the direction of cooling air supplied from the cooling fan 14 to the cooling air inlet ports 51 in a direction that avoids at least the hot heating part. The air direction control mechanism 35 comprises an air direction control body 52a rotatably pivoted on the cooling air inlet ports 51, an oil leakage detection means 53 detecting oil leakage from a cooling fan driving hydraulic motor 42 positioned near the cooling fan 41, and a controller 54 controlling the direction of the air direction control body 52a by determining the detection of oil leakage by the oil leakage detection means 53. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine enclosure device that surrounds an engine.
[0002]
[Prior art]
There is a construction machine in which an engine is surrounded by a house cover and an engine hood in order to prevent engine noise, and a fire extinguisher is provided in the engine hood in preparation for a fire (for example, see Patent Document 1).
[0003]
On the other hand, as shown in FIG. 5, the engine room 2 containing the engine 1 and the pump room 4 in which the hydraulic pump 3 driven by the engine 1 is installed are partitioned by the firewall unit 5, so that the pump piping is also increased. There is an enclosure 6 for preventing the occurrence of a fire due to oil leakage from the hydraulic pump 3 including the pump.
[0004]
In the structure of the enclosure 6 having a high hermeticity, the atmosphere in the engine room 2 is forcibly discharged by the ejector mechanism 8 using the exhaust flow from the muffler 7, so that the inside of the engine room 2 becomes negative pressure, and the hydraulic pump When the oil leaks from the pump chamber 3, the splashed oil from the pump chamber 4 side is sucked into the engine room 2 under a negative pressure through the gap of the firewall unit 5, and the muffler 7 heated to a high temperature by the exhaust heat. Or, there is a possibility of reaching a high-temperature heating section such as the turbocharger 9.
[0005]
Further, in a structure in which the engine 1 is surrounded by the enclosure 6 for soundproofing engine noise, the cooling fan cannot be driven by the belt by the engine 1, so that the hydraulic motor 11 is disposed outside the enclosure 6. The cooling fan 12 is hydraulically driven, and the cooling fan 12 uses the cooling unit 13 including a radiator for cooling engine cooling water and an oil cooler for cooling hydraulic oil in a main circuit, and a fuel cooler 14 for cooling fuel of the engine 1. And air cooling.
[0006]
Therefore, it is desirable to introduce cooling air from the cooling fan 12 into the engine room 2 in order to take measures against fire caused by oil splashing from the pump room 4 side.
[0007]
[Patent Document 1]
JP 2001-3387 (page 2, FIG. 3)
[0008]
[Problems to be solved by the invention]
When this cooling air is used, an opening is provided on the fan-facing surface of the enclosure 6, so that hydraulic equipment such as a fan driving hydraulic motor 11, a cooling unit 13, and a fuel cooler 14, which are arranged near the cooling fan 12, When the hydraulic piping, the fuel system equipment, and the fuel piping are broken, a flammable fluid such as scattered oil or fuel comes into contact with a high-temperature heating portion such as the muffler 7 or the turbocharger 9 in the engine room 2 on the cooling air. There is a risk.
[0009]
In particular, when oil is ejected from the hydraulic motor 11 that drives the cooling fan 12 or its motor piping, the oil continues to be ejected until the operating oil runs out, increasing the risk of fire.
[0010]
The present invention has been made in view of such a point, and an engine enclosure capable of preventing a flammable fluid from reaching a high-temperature heating unit in an engine room by controlling the direction of cooling air introduced into the enclosure. It is intended to provide a device.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an enclosure surrounding an engine having a high-temperature heating section, a cooling air inlet opening in a part of the enclosure, and a cooling fan installed facing the outside of the cooling air inlet. And a wind direction control mechanism for controlling a wind direction of the cooling air supplied from the cooling fan to the cooling air inlet at least in a direction to avoid the high-temperature heating section, and cooling the enclosure from the cooling fan. The direction of the cooling air supplied to the air inlet is controlled by a wind direction control mechanism at least in a direction to avoid the high-temperature heating section of the engine, so that the flammable fluid introduced into the enclosure causes the flammable fluid to cool the high-temperature heating section of the engine. Can be prevented.
[0012]
According to a second aspect of the present invention, in the engine enclosure device according to the first aspect, the wind direction control mechanism is rotatably supported by the cooling air inlet and is provided near the cooling fan. An engine enclosure device comprising: a fluid leak detection unit that detects a fluid leak from a device that receives a supply of a sexual fluid; and a controller that determines a fluid leak detection by the fluid leak detection unit and controls a direction of a wind direction adjusting body. When the fluid leak detecting means detects a fluid leak from the device receiving the supply of the flammable fluid, the controller controls the direction of the wind direction adjuster to supply the air from the cooling fan to the cooling air inlet of the enclosure. Since the direction of the cooling air is controlled at least in a direction to avoid the high temperature heating part of the engine, it is usually introduced from the cooling fan into the engine room. The wind is guided to the high-temperature heating section of the engine, so that the high-temperature heating section can be efficiently cooled.In addition, only when the cooling air containing the flammable fluid is introduced into the engine room, the flammable fluid is removed from the engine room. The possibility of reaching the high-temperature heating section can be automatically prevented.
[0013]
According to a third aspect of the present invention, in the engine enclosure device according to the second aspect, the controller closes the wind direction adjusting body after controlling the wind direction for a predetermined time by the wind direction adjusting body when the fluid leak detecting unit detects the fluid leakage. And, when the fluid leakage detecting means detects the possibility of fluid leakage, the engine is controlled while the flammable fluid first reaches the high-temperature heating section in the engine room while controlling the wind direction for a predetermined time by the wind direction adjusting body. The flammable fluid can be cooled, and the inflow of flammable fluid into the engine room can be shut off by closing the wind direction adjuster after confirming fluid leakage after a certain period of time, and the flammable fluid reaches the high-temperature heating section in the engine room. Can be reliably prevented.
[0014]
According to a fourth aspect of the present invention, in the engine enclosure device according to the second or third aspect, an alarm unit activated by an alarm signal from a controller that has determined the detection of the fluid leakage is provided. The controller that has determined the detection activates the alarm means in response to the alarm signal, so that the operator who has received the alarm can quickly cope with the leakage of the flammable fluid.
[0015]
According to a fifth aspect of the present invention, in the engine enclosure device according to any one of the second to fourth aspects, a device that receives a supply of flammable fluid is a hydraulic motor that receives a supply of hydraulic oil and drives a cooling fan. An engine enclosure device in which the fluid leak detection means is a pressure sensor for detecting a circuit pressure of hydraulic oil supplied to the hydraulic motor, and the fluid leak detection means is supplied to a hydraulic motor for driving a cooling fan. A pressure sensor that detects the circuit pressure of the operating oil, and if oil leaks from the hydraulic motor for driving the cooling fan and its piping connection, etc., the circuit pressure does not rise.Therefore, monitor this circuit pressure with a pressure sensor. Thus, the oil leakage can be reliably detected. In addition, a pressure sensor installed for controlling a hydraulic circuit or the like can be effectively used.
[0016]
According to a sixth aspect of the present invention, in the engine enclosure device according to any one of the second to fourth aspects, the device that receives the supply of the flammable fluid is a hydraulic motor for driving a cooling fan, and the fluid leakage detection unit includes: An engine enclosure device as a rotation speed sensor that detects a rotation speed of at least one of a cooling fan and a hydraulic motor, and a fluid leakage detection unit detects a rotation speed of at least one of a cooling fan and a hydraulic motor for driving the cooling fan. The rotational speed sensor detects the oil leakage. If oil leakage occurs from the hydraulic motor for driving the cooling fan and its pipe connection, the rotational speed does not increase. Therefore, by monitoring the rotational speed with the rotational speed sensor, the oil leakage is monitored. Can be reliably detected.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.
[0018]
FIG. 4 shows a hydraulic excavator as a working machine or a construction machine, in which an upper revolving unit 18 is rotatably provided on a lower traveling unit 17, and an engine and a hydraulic pump driven by the engine are mounted on the upper revolving unit 18. , A control valve unit (not shown) for controlling a hydraulic circuit using a hydraulic pump as a hydraulic source, a cab 21 for covering an operator's operating space, a working device 22, and the like.
[0019]
In the working device 22, an arm 26 pivoted by an arm hydraulic cylinder 25 is pivotally supported at a tip end of a boom 24 pivoted by a boom hydraulic cylinder 23, and a bucket hydraulic cylinder is attached to the tip end of the arm 26. A bucket 29 that is rotated by a linkage 27 via a linkage 28 is supported by a shaft.
[0020]
FIGS. 1 and 2 show the inside of the power unit 19, and an enclosure 32 surrounding an engine 31 such as a diesel engine and a room forcibly discharging an atmosphere in an engine room 33 formed by the enclosure 32. An engine enclosure device provided with an atmosphere exhausting means 34 and a wind direction control mechanism 35 for controlling a wind direction of cooling air supplied into the engine room 33 is provided.
[0021]
The engine 31 includes a muffler 36 and a turbocharger 37 as a high-temperature heating unit. The muffler 36 silences exhaust sound, and the turbocharger 37 compresses intake air to the engine 31 using exhaust energy. These muffler 36 and turbocharger 37 are both heated by high-temperature exhaust from engine 31.
[0022]
The enclosure 32 is internally partitioned by a firewall unit 38, and an engine room 33 in which an engine 31 is housed and a pump room 40 in which a hydraulic pump 39 driven by the engine 31 is installed are defined.
[0023]
A hydraulic pump 39 driven by the engine 31 supplies a plurality of hydraulic oils to hydraulic actuators such as the various hydraulic cylinders 23, 25, and 27 and hydraulic motors (not shown) for traveling and turning. These include a main circuit hydraulic pump, and a fan circuit hydraulic pump that pressurizes and supplies hydraulic oil to a hydraulic motor 42 for driving a cooling fan that drives a cooling fan 41 installed outside the enclosure 32. The hydraulic pump for the main circuit and the hydraulic pump for the fan circuit are variable displacement pumps capable of variably controlling the pump discharge flow rate. Hereinafter, the hydraulic pump 39 is a fan circuit hydraulic pump.
[0024]
The cooling fan 41 supplies cooling air to a cooling unit 43 including a radiator for cooling the engine cooling water and an oil cooler for cooling the working oil of the main circuit, and a fuel cooler 44 for cooling the fuel of the engine 31 to supply these cooling air. The cooling unit 43 and the fuel cooler 44 are air-cooled, and the rotation speed of the hydraulic motor 42 for driving the cooling fan, that is, the rotation speed of the cooling fan 41 is controlled by variably controlling the pump discharge flow rate by the variable displacement hydraulic pump 39. The rotation speed can be variably controlled, whereby the air cooling capacity can also be variably controlled.
[0025]
The indoor atmosphere exhausting means 34 has an ejector structure in which an exhaust pipe 46 projecting from the muffler 36 is fitted through a gap 47 to an exhaust pipe 45 projecting from the enclosure 32. The atmosphere in the engine room 33 is sucked out of the gap 47 by the negative pressure generated around the exhaust flow ejected from the exhaust pipe 45 to the exhaust outer pipe 45, and the outside air is drawn into the engine room 33 from the gaps and openings provided in the enclosure 32. Has a function of ventilating the inside of the engine room 33.
[0026]
A vent 50 is opened in a lower part of the firewall part 38 of the enclosure 32 opposite to an upper part where the muffler 36 and the turbocharger 37 are arranged.
[0027]
On the other hand, a cooling air inlet 51 is opened in a side surface portion 32 a of the enclosure 32 facing the cooling fan 41.
[0028]
The airflow direction control mechanism 35 controls the airflow direction of the cooling air supplied to the cooling air inlet 51 from the cooling fan 41 installed to face the outside of the cooling air inlet 51 so as to at least avoid the high-temperature heating unit. And a supply of working oil as a flammable fluid located in the vicinity of the cooling fan 41, such as movable louvers or flaps rotatably supported by the cooling air inlet 51. Oil leak detecting means 53 as fluid leak detecting means for detecting oil leak as fluid leak from the hydraulic motor 42 as a device receiving the oil, and a wind direction adjuster 52a which judges oil leak detection by the oil leak detecting means 53 and judges the oil leak. , 52b.
[0029]
The ventilation port 50 and the cooling air introduction port 51 are provided on an external air circulation route that does not pass through a high-temperature heating unit such as the muffler 36 and the turbocharger 37 in the engine room 33.
[0030]
As shown in FIG. 1, the wind direction adjusting body 52a is a movable louver or flap that opens and closes in a vertical direction via a transmission means 56a such as a cam slider mechanism operated by an actuator 55a such as an electric motor. Similarly, as shown in FIG. 2, the wind direction adjusting member 52b is a movable louver or flap that opens and closes in the horizontal direction via transmission means 56b such as a cam slider mechanism operated by an actuator 55b such as an electric motor. It is.
[0031]
When oil leakage occurs due to breakage of the hydraulic motor 42 or the like, the route of cooling air flowing into the enclosure 32 in the engine room is a route that does not pass through a high-temperature heating unit such as the muffler 36 and the turbocharger 37. In this way, the directions of the wind direction adjusters 52a and 52b of the cooling air inlet 51 are respectively controlled.
[0032]
The oil leak detecting means 53 is a pressure sensor for detecting a circuit pressure of hydraulic oil supplied from the hydraulic pump 39 to the hydraulic motor 42 for driving the cooling fan (hereinafter, this pressure is referred to as “hydraulic pump / motor circuit pressure”). Or a rotation speed sensor 58 that detects the rotation speed of at least one of the cooling fan 41 and the hydraulic motor 42 (hereinafter, this rotation speed is referred to as “cooling fan / motor rotation speed”). Alternatively, the rotation speed sensor 58 is connected to the controller 54.
[0033]
The controller 54 monitors the hydraulic pump / motor circuit pressure detected by the pressure sensor 57 or monitors the cooling fan / motor rotational speed detected by the rotational speed sensor 58, and at the same time, the swash plate of the hydraulic pump 39. The variable displacement means for adjusting the tilt angle and the like is variably controlled. At this time, a control signal for controlling the variable displacement means of the hydraulic pump 39 is also monitored, and the hydraulic pump for driving the fan is controlled in accordance with the control signal.・ Monitor the motor circuit pressure or the cooling fan ・ Motor rotation speed rises.
[0034]
The controller 54 monitors the pressure of the fan drive hydraulic pump / motor circuit supplied from the hydraulic pump 39 to the hydraulic motor 42 by the pressure sensor 57, and the controller 54 receives the supply of hydraulic oil as a flammable fluid. When oil leaks from one of the hydraulic motor 42 for driving the cooling fan and its piping connection part, the hydraulic pressure monitored by the controller 54 for increasing the discharge pressure of the hydraulic pump 39 is monitored in response to a pump control signal from the controller 54. Since the pump / motor circuit pressure does not increase and sometimes decreases, the controller 54 monitoring the hydraulic pump / motor circuit pressure with the pressure sensor 57 can detect the oil leakage.
[0035]
Alternatively, similarly to the hydraulic pump / motor circuit pressure, the controller 54 monitors the rotation speed of the cooling fan 41 or the hydraulic motor 42, that is, the cooling fan / motor rotation speed by the rotation speed sensor 58. When oil leaks from the piping connection or the like, the monitored cooling fan / motor rotation speed does not increase in response to a pump control signal from the controller 54 for increasing the discharge flow rate of the hydraulic pump 39, and in some cases, Therefore, the controller 54 monitoring the rotation speed of the cooling fan / motor with the rotation speed sensor 58 can detect the oil leakage.
[0036]
The controller 54 is connected to actuators 55a and 55b that operate the wind direction adjusters 52a and 52b, respectively. The controller 54 controls the directions of the wind direction adjusters 52a and 52b through controlling the operation amounts of the actuators 55a and 55b. By controlling and operating the wind direction adjusting bodies 52a and 52b to the maximum extent, the cooling air inlet 51 can be completely closed.
[0037]
Further, the controller 54 is connected to alarm means 59 such as a buzzer and a speaker which are activated by an alarm signal from the controller 54 which has determined the oil leak detection.
[0038]
Next, the operation and effect of the above embodiment will be described with reference to the control procedure of the controller 54 shown in FIG. Note that the circled numbers in FIG. 3 indicate the step numbers of the control procedure.
[0039]
(Step 1)
By monitoring the pressure of the hydraulic pump / motor circuit for driving the fan detected by the pressure sensor 57 or the rotation speed of the cooling fan / motor detected by the rotation speed sensor 58, the hydraulic motor 42 for driving the cooling fan or its motor is monitored. Monitor for oil leaks from piping.
[0040]
(Step 2)
The pump discharge flow rate is controlled by controlling the displacement variable means of the variable displacement hydraulic pump 39, and the rotation speed of the hydraulic motor 42 for driving the cooling fan is controlled. The control signal to be monitored is also monitored.
[0041]
(Step 3)
Contrary to the variable capacity control signal of the hydraulic pump 39 for controlling the rotation speed of the cooling fan 41, it is determined whether the hydraulic pump / motor circuit pressure for fan driving or the cooling fan / motor rotation speed does not rise. I do.
[0042]
If the hydraulic pump / motor circuit pressure or the cooling fan / motor rotation speed rises normally (NO in step 3), the directions of the wind direction adjusters 52a and 52b are changed to the high temperature heating of the muffler 36 and the turbocharger 37 of the engine 31. The cooling air introduced into the engine room 33 from the cooling fan 41 is also guided to these high-temperature heating sections to efficiently cool these high-temperature heating sections.
[0043]
(Step 4)
If the pressure of the hydraulic pump / motor circuit for driving the fan or the rotation speed of the cooling fan / motor does not rise and remains falling (YES in step 3), the directions of the wind direction adjusters 52a and 52b are controlled to perform cooling. By controlling the direction of the wind to a direction in which the high-temperature heating section such as the muffler 36 and the turbocharger 37 does not exist, the engine 31 is cooled while preventing the possibility that oil leaks to the high-temperature heating section in the engine compartment 33 to reach. .
[0044]
(Step 5)
It is determined whether the pressure of the hydraulic pump / motor circuit for driving the fan or the rotation speed of the cooling fan / motor has not risen and has been lowered for a predetermined time.
[0045]
(Step 6)
Contrary to the control signal of the hydraulic pump 39, if the hydraulic pump / motor circuit pressure for driving the fan or the rotation speed of the cooling fan / motor does not rise even after a certain period of time (YES in step 5), the hydraulic motor 42 It is determined that there is oil leakage from the cooling air inlet 51, and the wind direction adjusters 52a and 52b of each cooling air inlet 51 are completely closed, so that cooling air containing a flammable fluid such as hydraulic oil flows from the cooling air inlet 51 into the engine room 33. To prevent the risk of being introduced into
[0046]
Thus, even if oil leaked from the hydraulic motor 42 is mixed into the cooling air, it is possible to reliably prevent the oil leaking from reaching the muffler 36 and the turbocharger 37 heated to a high temperature in the engine room 33.
[0047]
(Step 7)
After closing the wind direction adjusters 52 a and 52 b of the cooling air inlet 51, the controller 54 sends an alarm signal to the alarm means 59.
[0048]
Next, the operation and effect of this embodiment will be described.
[0049]
Since the direction of the cooling air supplied from the cooling fan 41 to the cooling air inlet 51 of the enclosure 32 is controlled by the wind direction control mechanism 35 in a direction to avoid the muffler 36 and the turbocharger 37 heated to at least the high temperature of the engine 31. In addition, it is possible to prevent the oil leaking from the hydraulic motor 42 from reaching the muffler 36 and the turbocharger 37 of the engine 31 due to the cooling air introduced into the enclosure 32.
[0050]
When the oil leak detecting means 53 detects oil leak from the hydraulic motor 42, the controller 54 controls the directions of the wind direction adjusters 52a and 52b, and is supplied from the cooling fan 41 to the cooling air inlet 51 of the enclosure 32. Since the direction of the cooling air is controlled at least in a direction to avoid the muffler 36 and the turbocharger 37 of the engine 31, the cooling air introduced into the engine chamber 33 from the cooling fan 41 is usually supplied to the muffler 36 and the turbocharger of the engine 31. 37, the high-temperature heating sections can be efficiently cooled, and only when the cooling air containing the leaking oil is introduced into the engine chamber 33, the leaking oil is discharged into the engine chamber 33. Can be automatically prevented from reaching high-temperature heating sections such as the muffler 36 and the turbocharger 37.
[0051]
The oil leak detecting means 53 is a pressure sensor 57 for detecting a circuit pressure of the hydraulic oil supplied to the hydraulic motor 42 for driving the cooling fan. Since the circuit pressure does not increase when a leak occurs, monitoring the circuit pressure with the pressure sensor 57 allows the oil leak to be reliably detected. Further, as the pressure sensor 57, a sensor installed for controlling a hydraulic circuit or the like can be effectively used.
[0052]
Similarly, the oil leak detecting means 53 is a rotational speed sensor 58 for detecting the rotational speed of at least one of the cooling fan 41 and the hydraulic motor 42 for driving the cooling fan. The rotation speed does not increase when oil leakage occurs due to, for example, such that the oil leakage can be reliably detected by monitoring the rotation speed with the rotation speed sensor 58.
[0053]
When the pressure sensor 57 or the rotation speed sensor 58 of the oil leak detecting means 53 detects the possibility of oil leak from the hydraulic motor 42, the wind direction adjusting bodies 52a and 52b control the wind direction for a certain time, and The engine 31 can be cooled while preventing the possibility of oil leaking to the high-temperature heating portion of the motor, and the wind direction adjusters 52a and 52b are closed after confirming oil leak from the hydraulic motor 42 after a certain period of time. The inflow of leaked oil into the engine compartment 33 can be completely shut off.
[0054]
The controller 54 that has determined the oil leak detection activates the alarm means 59 based on the alarm signal, so that the operator who has received the alarm can quickly deal with the flammable fluid leakage.
[0055]
This technique is applicable not only to hydraulic oil but also to a fuel cooler 44 in which fuel may be ejected due to breakage. In short, flammable fuel in which a cooling fan 41 arranged near the engine 31 may draw in The present invention can be applied to a device that receives supply of a sexual fluid.
[0056]
As described above, when the hydraulic equipment, the hydraulic piping, the fuel system equipment, and the fuel piping are damaged upstream of the cooling air, the wind direction adjusters 52a such as movable louvers installed in the enclosure 32 surrounding the engine 31 are used. 52b changes direction and controls the inflow route of the cooling air containing the flammable fluid such as oil and fuel to a route far from the muffler 36 and the turbocharger 37. Further, the wind direction adjusters 52a and 52b are closed to block a flammable fluid such as oil or fuel from entering the engine room 33, thereby reaching a high-temperature heating unit such as the muffler 36 or the turbocharger 37. Is surely prevented.
[0057]
【The invention's effect】
According to the first aspect of the present invention, the direction of the cooling air supplied from the cooling fan to the cooling air inlet of the enclosure is controlled by the wind direction control mechanism at least in a direction to avoid the high temperature heating portion of the engine. The flammable fluid can be prevented from reaching the high-temperature heating section of the engine by the cooling air introduced into the engine.
[0058]
According to the second aspect of the present invention, when the fluid leak detecting means detects the fluid leak from the device receiving the supply of the flammable fluid, the controller controls the direction of the wind direction adjuster to cool the enclosure from the cooling fan. Since the direction of the cooling air supplied to the air inlet is controlled at least in a direction to avoid the high temperature heating section of the engine, the cooling air normally introduced from the cooling fan into the engine room is also guided to the high temperature heating section of the engine. This high-temperature heating section can be efficiently cooled, and only when the cooling air containing the flammable fluid is introduced into the engine room, the risk that the flammable fluid reaches the high-temperature heating section in the engine room is automatically reduced. Can be prevented.
[0059]
According to the third aspect of the present invention, when the fluid leakage detecting means detects the possibility of fluid leakage, the flammable fluid may first reach the high-temperature heating section in the engine room while controlling the wind direction for a predetermined time by the wind direction adjusting body. The engine can be cooled while preventing air leakage.Furthermore, by checking the fluid leakage after a certain period of time, closing the wind direction adjustment body can cut off the inflow of flammable fluid into the engine room, and It is possible to reliably prevent the flammable fluid from reaching.
[0060]
According to the fourth aspect of the present invention, the controller that has determined the detection of the fluid leakage activates the alarm unit in response to the alarm signal, so that the operator who has received the alarm can quickly cope with the fluid leakage of the flammable fluid.
[0061]
According to the fifth aspect of the present invention, the fluid leak detecting means is a pressure sensor for detecting a circuit pressure of hydraulic oil supplied to the hydraulic motor for driving the cooling fan, and the hydraulic motor for driving the cooling fan and its piping connection. Since the circuit pressure does not increase when oil leaks from a part or the like, the oil leak can be reliably detected by monitoring the circuit pressure with a pressure sensor. In addition, a pressure sensor installed for controlling a hydraulic circuit or the like can be effectively used.
[0062]
According to the invention described in claim 6, the fluid leakage detecting means is a rotational speed sensor for detecting the rotational speed of at least one of the cooling fan and the hydraulic motor for driving the cooling fan, and the hydraulic motor for driving the cooling fan and its piping. The rotation speed does not increase when oil leaks from a connection portion or the like. Therefore, by monitoring this rotation speed with a rotation speed sensor, the oil leak can be reliably detected.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view showing an embodiment of an engine enclosure device according to the present invention.
FIG. 2 is a horizontal sectional view of the engine enclosure device.
FIG. 3 is a flowchart showing a control procedure of a controller that controls the engine enclosure device.
FIG. 4 is a side view of the hydraulic excavator on which the engine enclosure device is mounted.
FIG. 5 is a sectional view showing a conventional enclosure structure.
[Explanation of symbols]
31 Engine 32 Enclosure 35 Wind direction control mechanisms 36, 37 Muffler and turbocharger 41 as high temperature heating unit 41 Cooling fan 42 Hydraulic motor 51 as a device that receives supply of flammable fluid Cooling air inlets 52a, 52b Wind direction adjuster 53 Fluid leakage Oil leak detection means 54 as detection means Controller 57 Pressure sensor 58 Rotation speed sensor 59 Alarm means

Claims (6)

An enclosure surrounding the engine having a high temperature heating section;
A cooling air inlet opening in a part of the enclosure,
A cooling fan installed facing the outside of the cooling air inlet,
An engine enclosure device comprising: a wind direction control mechanism configured to control a wind direction of cooling air supplied from a cooling fan to a cooling air inlet at least in a direction to avoid the high-temperature heating unit. The wind direction control mechanism is
A wind direction adjuster rotatably supported by the cooling air inlet,
Fluid leak detection means for detecting a fluid leak from a device receiving a supply of a flammable fluid located near the cooling fan,
2. The engine enclosure device according to claim 1, further comprising: a controller configured to determine a fluid leak detection by the fluid leak detecting unit and control a direction of the wind direction adjusting body. The controller is
3. The engine enclosure device according to claim 2, wherein the wind direction adjusting member is closed after controlling the wind direction for a predetermined time by the wind direction adjusting member when the fluid leak detecting means detects the fluid leak. 4. The engine enclosure device according to claim 2, further comprising an alarm unit that is activated by an alarm signal from a controller that has determined the detection of the fluid leakage. The equipment that receives the supply of the flammable fluid is a hydraulic motor that receives the supply of hydraulic oil and drives the cooling fan,
The engine enclosure device according to any one of claims 2 to 4, wherein the fluid leakage detection means is a pressure sensor that detects a circuit pressure of hydraulic oil supplied to the hydraulic motor. The device that receives the supply of the flammable fluid is a hydraulic motor for driving the cooling fan,
The engine enclosure device according to any one of claims 2 to 4, wherein the fluid leakage detection means is a rotation speed sensor that detects a rotation speed of at least one of a cooling fan and a hydraulic motor.

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