Construction machine

Abstract

To solve a problem that, in a construction machine equipped with a fuel cell device as a power source, water is produced by a chemical reaction, so water discharged from a fuel cell device needs to be discharged to the outside of a construction machine, but water tends to be accumulated in a drainage pipe for discharging the water to the outside of the construction machine.SOLUTION: A construction machine (100) includes a fuel cell device (42) having a device drain port (43) and a drain pipe (30) connected to the device drain port (43). The drain pipe (30) is disposed at a position equal to or lower than a height of the device drain port (43).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to construction machines such as hydraulic excavators. [Background technology]

[0002] The construction machine described in Patent Document 1 includes a main body that can be rotated by rotating a rotating part, a working device connected to one end of the main body, a hydrogen tank that stores hydrogen and is provided inside the other end of the main body, and a fuel cell that is provided inside the main body and receives the hydrogen from the hydrogen tank. This fuel cell can generate electricity (power) through a chemical reaction between hydrogen and oxygen. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 137688 Summary of the Invention [Problem to be solved by the invention]

[0004] In construction machinery equipped with an engine as a power source, the high-temperature exhaust gas discharged from the engine is generally discharged from the top of the machine body such as the upper rotating body, but when such an exhaust structure is applied to a construction machinery equipped with a fuel cell device as a power source, the following problem occurs. That is, in the fuel cell device, water (water vapor) is generated by a chemical reaction, so the water discharged from the fuel cell device needs to be discharged outside the construction machinery. However, if a drainage pipe for discharging this water outside the construction machinery is arranged upward from the fuel cell device toward the top of the machine body, water is likely to remain in the drainage pipe.

[0005] An object of the present disclosure is to provide a construction machine that is less likely to cause water to stagnate in a drainage pipe that discharges water from a fuel cell device outside the construction machine. [Means for solving the problem]

[0006] The construction machine of the first aspect comprises a fuel cell device having an device drain outlet, and a drain pipe connected to the device drain outlet, the drain pipe being positioned at a position below the height of the device drain outlet.

[0007] In the construction machine of this first aspect, the drain pipe connected to the device drain outlet of the fuel cell device is positioned at a position below the height of the device drain outlet, so that water discharged from the fuel cell device is less likely to stagnate in the drain pipe compared to when the drain pipe is positioned upward toward the top of the machine body.

[0008] In the second aspect, the construction machine according to the first aspect is preferably further provided with the following configuration. That is, in the construction machine according to the second aspect, it is preferable that the drain pipe has a pipe drain outlet, and the pipe drain outlet is located lower than the device drain outlet. In this case, water in the drain pipe is more easily discharged from the pipe drain outlet, so that water is less likely to stagnate in the drain pipe.

[0009] In the third aspect, the construction machine according to the second aspect is preferably further provided with the following configuration. That is, in the construction machine according to the third aspect, the pipe drain outlet is preferably formed at the lowest part of the drain pipe. In this case, water in the drain pipe flows toward the lowest part of the drain pipe and is smoothly discharged from the pipe drain outlet formed at the lowest part.

[0010] In a fourth aspect, it is preferable that the construction machine according to the second or third aspect further includes the following configuration. That is, it is preferable that the construction machine according to the fourth aspect further includes a machine body frame located below the fuel cell device, the drain pipe extends toward an opening formed in the machine body frame, and the pipe drain outlet is disposed in the opening or below the opening. In this case, water in the drain pipe can be discharged below the machine body frame from the pipe drain outlet disposed in the opening of the machine body frame or the pipe drain outlet disposed below the opening of the machine body frame.

[0011] In the fifth aspect, it is preferable that the construction machine according to the fourth aspect further includes the following configuration. That is, in the construction machine according to the fifth aspect, it is preferable that the machine body frame includes a structural member and a non-structural member, and the opening is formed in the non-structural member or between the structural member and the non-structural member. In this case, water in the drain pipe can be discharged from the pipe drain outlet below the opening in the machine body frame without forming an opening in the structural member of the machine body frame.

[0012] The sixth aspect is preferably the construction machine according to the fifth aspect further comprising the following configuration. That is, in the construction machine according to the sixth aspect, it is preferable that the drain pipe has a downward portion that extends downward at a position that avoids the structural member. In this case, the pipe drain outlet can be disposed in the opening formed in the machine frame while satisfying the constraint that no opening is formed in the structural member of the machine frame and suppressing the length of the drain pipe from increasing, or the pipe drain outlet can be positioned below the opening of the machine frame by inserting the drain pipe into the opening formed in the machine frame. In this case, the drain pipe may have a lateral portion (upstream lateral portion) that extends sideways between the device drain outlet and the downward portion to avoid the structural member.

[0013] In a seventh aspect, it is preferable that the construction machine according to any one of the first to sixth aspects further comprises the following configuration. That is, it is preferable that the construction machine according to the seventh aspect further comprises a drainage receiver for receiving water guided by the drain pipe. In this case, the drainage receiver may be disposed in a position to receive water discharged from the pipe outlet of the drain pipe, or may be disposed midway along the drain pipe.

[0014] In an eighth aspect, it is preferable that the construction machine according to the seventh aspect further comprises the following configuration. That is, in the construction machine according to the eighth aspect, it is preferable that the drainage receiver has a storage section capable of storing water, and a receiver drain outlet capable of discharging the water stored in the storage section. In this eighth aspect, the drainage receiver has a function of temporarily storing water, and also has a function of discharging at least a portion of the water stored in the drainage receiver from the receiver drain outlet.

[0015] In a ninth aspect, in the construction machine according to the eighth aspect, it is preferable that the construction machine further comprises the following configuration. That is, in the construction machine according to the ninth aspect, it is preferable that the drainage receiver further has a water vapor outlet for discharging water vapor. In the ninth aspect, the drainage receiver can discharge liquid water from the receiver drain outlet and discharge gaseous water (water vapor) from the water vapor outlet.

[0016] In a tenth aspect, in the construction machine according to the ninth aspect, it is preferable that the construction machine according to the tenth aspect further comprises the following configuration. That is, in the construction machine according to the tenth aspect, it is preferable that the receiver drain outlet is formed in a lower part of the wastewater receiver, and the water vapor outlet is formed in a side part of the wastewater receiver. In this case, the wastewater receiver can discharge liquid water from the receiver drain outlet formed in the lower part of the wastewater receiver, and discharge gaseous water (water vapor) from the water vapor outlet formed in the side part of the wastewater receiver.

[0017] In an eleventh aspect, the construction machine according to any one of the seventh to tenth aspects is preferably further provided with the following configuration. That is, the construction machine according to the eleventh aspect is preferably further provided with a body frame located below the fuel cell device, and the drainage receiver is preferably arranged below the body frame and configured to receive water discharged from the pipe drain outlet. In this case, the drainage receiver can receive water discharged from the drain pipe below the body frame.

[0018] A twelfth aspect is preferably a construction machine according to any one of the seventh to eleventh aspects, further comprising the following configuration. That is, in the construction machine according to the twelfth aspect, it is preferable that the drain receiver is disposed under the machine body frame, the drain pipe includes a downstream side lateral portion that is a portion extending sideways between the machine body frame and the bottom surface of the drain receiver, and the pipe drain outlet is formed at the tip of the downstream side lateral portion. In this case, even if the thickness (vertical dimension) of the drain receiver is designed to be small, it is easier to ensure the distance between the pipe drain outlet and the inner surface of the drain receiver compared to the case where the pipe drain outlet is formed at the lower end of the portion extending downward. This makes it possible to reduce pressure loss when discharging water in the drain pipe, thereby suppressing a decrease in drainage efficiency in the drain pipe.

[0019] In a thirteenth aspect, the construction machine according to the twelfth aspect is preferably further provided with the following configuration. That is, in the construction machine according to the thirteenth aspect, the drain pipe preferably has a water drain hole in a portion of the lower surface of the downstream horizontal portion upstream of the pipe drain outlet. In this case, water retention in the downstream horizontal portion of the drain pipe can be effectively suppressed.

[0020] A fourteenth aspect is preferably the construction machine according to any one of the ninth to thirteenth aspects further comprising the following configuration. That is, the construction machine according to the fourteenth aspect may further comprise a duct into which the water vapor discharged from the water vapor exhaust port flows in. In this eleventh aspect, the discharge position (relative position) of the water vapor with respect to the machine frame can be changed by changing the length, shape, and orientation of the duct.

[0021] In a fifteenth aspect, it is preferable that the construction machine according to any one of the seventh to fourteenth aspects further comprises the following configuration. That is, the construction machine according to the fifteenth aspect preferably further comprises a water level sensor that detects the water level in the drainage receiver, and a controller, and the controller preferably performs control to notify information related to the water level to people involved in the work based on the detection result input from the water level sensor. In this case, people involved in the work, such as an operator, can recognize the water level in the drainage receiver.

[0022] In a sixteenth aspect, it is preferable that the construction machine according to any one of the seventh to fifteenth aspects further comprises the following configuration. That is, it is preferable that the construction machine according to the sixteenth aspect further comprises a water level sensor that detects the water level in the drainage receiver, and a controller, and the controller controls the timing of discharging the water stored in the drainage receiver from the drainage receiver based on the detection result input from the water level sensor. In this case, the water stored in the drainage receiver is discharged from the drainage receiver at an appropriate timing, even if a person involved in the work, such as an operator, does not perform the work of discharging the water stored in the drainage receiver from the drainage receiver.

[0023] A seventeenth aspect may further include the following configuration in the construction machine according to any one of the seventh to tenth aspects: That is, in the construction machine according to the seventeenth aspect, the drain pipe may include an upstream portion extending from the device drain outlet to the drain receiver, and a downstream portion extending from the drain receiver to the pipe drain outlet, and the drain receiver may be disposed above the machine frame and configured to receive water guided by the upstream portion.

[0024] An eighteenth aspect may further include the following configuration in the construction machine according to any one of the first to seventeenth aspects. That is, the construction machine according to the eighteenth aspect may include a lower traveling body, an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body around a vertically extending rotating shaft, and a swivel joint arranged on the rotating shaft, and the swivel joint may have a guide path for receiving water guided by the drain pipe and guiding the water downward. In this eighteenth aspect, the water guided by the drain pipe is guided downward through the guide path of the swivel joint arranged on the rotating shaft, thereby reducing the frequency of occurrence of defects such as dirt and corrosion caused by water splashing on structures such as crawler traveling devices.

[0025] A nineteenth aspect may further include the following configuration in the construction machine according to any one of the first to seventeenth aspects. That is, the construction machine according to the nineteenth aspect may include a lower traveling body, an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body around a vertically extending rotating shaft, and a swivel joint arranged on the rotating shaft, and the drain pipe may have a portion extending downward along an outer surface of the swivel joint, and a pipe drain outlet may be formed in the portion. In this nineteenth aspect, water guided by the drain pipe is guided downward through a part of the drain pipe extending downward along the outer surface of the swivel joint arranged on the rotating shaft, and is discharged from the pipe drain outlet formed in the part, so that the frequency of occurrence of defects such as dirt and corrosion caused by water splashing on structures such as crawler traveling devices is reduced.

[0026] A twentieth aspect may further include the following configuration in the construction machine according to any one of the first to nineteenth aspects. That is, the construction machine according to the twentieth aspect may include a lower traveling body having a car body, an upper rotating body supported on the lower traveling body so as to be rotatable relative to the lower traveling body around a rotating shaft extending vertically, and a lower drainage receiver supported on the car body and receiving water guided by the drain pipe. In this twentieth aspect, the water guided by the drain pipe can be received in the lower drainage receiver supported on the car body of the lower traveling body, so that the water is prevented from splashing on the car body and surrounding structures. In the twentieth aspect, the lower drainage receiver may be disposed at a position to receive water discharged from a pipe drain outlet of the drain pipe, or may be disposed midway along the drain pipe. In addition, in the twentieth aspect, it is preferable that the lower drainage receiver has a shape (for example, a ring shape) that surrounds the rotating shaft. In this case, the lower drain receiver can receive water guided by the drain pipe regardless of the rotation angle of the upper rotating body relative to the lower traveling body.

[0027] In a twenty-first aspect, the construction machine according to the twenty-first aspect is preferably further provided with the following configuration. That is, in the construction machine according to the twenty-first aspect, the lower drainage receiver preferably has a lower storage section that is a storage section capable of storing water, and a lower receiver drain outlet that can discharge the water stored in the lower storage section. In this twenty-first aspect, water can be temporarily stored in the lower storage section, and the stored water can be drained from the lower receiver drain outlet. In the twenty-first aspect, the construction machine may further include a water level sensor that detects the water level in the lower receiver drain outlet, and a controller, and in this case, the controller may perform control to notify information about the water level to people involved in the work based on the detection result input from the water level sensor. Also, the controller may control the timing of discharging the water stored in the lower drainage receiver from the lower drainage receiver based on the detection result input from the water level sensor.

[0028] A 22nd aspect may further include the following configuration in the construction machine according to any one of the 1st to 21st aspects. That is, the construction machine according to the 22nd aspect includes a lower traveling body, an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body around a vertically extending rotating shaft, and a water vapor exhaust port for exhausting water vapor contained in the water guided by the drain pipe, and the upper rotating body includes an outer wall defining a machine room, and an exhaust port for exhausting air inside the machine room is formed in the outer wall, and the water vapor exhaust port may be configured to exhaust water vapor in a direction along the exhaust direction of the air exhausted from the exhaust port. In this 22nd aspect, the water vapor exhaust port exhausts water vapor in a direction along the exhaust direction of the air exhausted from the exhaust port, so that the exhausted water vapor is likely to move away from the construction machine. This prevents the exhausted water vapor from entering the inside of the construction machine again. In the 22nd aspect, it is preferable that the exhaust port and the water vapor exhaust port are formed on the same side of the right side, the left side, the rear side, or the front side of the construction machine. Also, in the 22nd aspect, when a heat exchanger is arranged inside the machine room, the temperature of the air exhausted from the exhaust port becomes higher than the outside air temperature. In this case, the water vapor exhausted from the water vapor exhaust port mixes with the high-temperature air exhausted from the exhaust port, thereby suppressing condensation of the water vapor, and therefore, for example, the frequency of poor visibility caused by condensation of the water vapor in winter can be reduced.

[0029] A 23rd aspect may further include the following configuration in the construction machine according to any one of the first to 22nd aspects. That is, the construction machine according to the 23rd aspect includes a lower traveling body, an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body around a vertically extending rotating shaft, and a water vapor exhaust port for exhausting water vapor contained in water guided by the drain pipe, the upper rotating body includes an outer wall defining a machine room, the outer wall is formed with an air intake port for drawing air outside the machine room into the inside of the machine room, and the water vapor exhaust port may include a guide plate for guiding water vapor such that the exhaust direction of the water vapor exhausted from the water vapor exhaust port is a direction away from the air intake port. In this 23rd aspect, the water vapor exhausted from the water vapor exhaust port is guided by the guide plate in a direction away from the air intake port, so that the exhausted water vapor is prevented from entering the machine room again through the air intake port.

[0030] A 24th aspect may further include the following configuration in the construction machine according to any one of the first to 23rd aspects. That is, the construction machine according to the 24th aspect may include a lower traveling body, an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body around a vertically extending rotating shaft, and a water vapor exhaust port for exhausting water vapor contained in water guided by the drain pipe, the upper rotating body having an outer wall defining a machine room, the outer wall being formed with an air intake port for sucking air outside the machine room into the inside of the machine room, and the water vapor exhaust port and the air intake port may be formed at a position where the machine room is interposed between them. In this 24th aspect, the water vapor exhaust port and the air intake port are formed at a position where the machine room is interposed between them, so that the water vapor exhausted from the water vapor exhaust port is prevented from entering the machine room again through the air intake port. Effect of the Invention

[0031] According to the present disclosure, a construction machine can be provided that is able to prevent water from stagnating in a drainage pipe for discharging water discharged from a fuel cell device outside the construction machine. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a side view showing a construction machine according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing the inside of a machine room of the construction machine, and is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 2 is a perspective view showing a vehicle frame and a fuel cell device. [Figure 4] FIG. 4 is an enlarged perspective view of a portion surrounded by a dashed line in FIG. 3. [Diagram 5] 5 is a right side view of the part shown in FIG. 4 as viewed in the direction indicated by arrow V. FIG. [Figure 6] FIG. 4 is a perspective view showing a drainage receiver provided in a construction machine according to a first modified example of the embodiment. [Figure 7] 4 is a cross-sectional view showing the drainage receiver in Modification 1. FIG. [Figure 8] FIG. 11 is a perspective view showing a state in which the drainage receiver is supported by a machine body frame in the construction machine according to the first modified example, as viewed obliquely from below at the rear of the upper rotating body. [Figure 9] 10 is a side view showing a state in which the drainage receiver is supported by a machine frame in the construction machine according to the first modified example. FIG. [Figure 10] 10 is a rear view showing a state in which the drainage receiver is supported by the machine body frame in the construction machine according to the first modified example. FIG. [Figure 11] FIG. 11 is a perspective view showing a drainage receiver provided in a construction machine according to a second modified example of the embodiment. [Figure 12] FIG. 11 is a perspective view showing the drainage receiver in Modification 2, illustrating a state in which the upper wall of the drainage receiver has been removed. [Figure 13] FIG. 11 is a perspective view showing a state in which the drainage receiver is supported by a machine body frame in a construction machine according to Modification 2, as viewed obliquely from below at the rear of the upper rotating body. [Figure 14] 11 is a side view showing a state in which the drainage receiver is supported by a machine frame in a construction machine according to a second modified example. FIG. [Figure 15] 11 is a rear view showing a state in which the drainage receiver is supported by the machine body frame in the construction machine according to the second modified example. FIG. [Figure 16] FIG. 11 is a perspective view showing a drainage receiver provided in a construction machine according to a third modified example of the embodiment. [Figure 17] FIG. 13 is a perspective view showing the drainage receiver in Modification 3, illustrating a state in which the upper wall of the drainage receiver has been removed. [Figure 18] FIG. 11 is a perspective view showing a state in which the drainage receiver is supported by a machine body frame in a construction machine according to a third modified example, as viewed obliquely from below at the rear of the upper rotating body. [Figure 19] 13 is a side view showing a state in which the drainage receiver is supported by a machine frame in a construction machine according to a third modified example. FIG. [Figure 20] FIG. 11 is a rear view showing a state in which the drainage receiver is supported by the machine body frame in the construction machine according to the third modified example. [Figure 21] FIG. 13 is a perspective view showing a drain pipe in a third modified example. [Figure 22] FIG. 11 is a perspective view showing a state in which the drainage receiver and the duct are supported by the machine frame in a construction machine according to a fourth modified example of the embodiment, and is a view of the rear part of the upper rotating body viewed obliquely from below. [Figure 23] FIG. 11 is a side view showing a state in which the drainage receiver is supported by the machine frame in a construction machine according to a fifth modified example of the embodiment. [Figure 24] FIG. 13 is a side view showing a state in which a drainage receiver is disposed in a machine room in a construction machine according to a sixth modified example of the embodiment. [Diagram 25] FIG. 11 is a side view showing a main part of a construction machine according to still another modified example of the embodiment. [Figure 26] FIG. 26 is a perspective view showing a lower traveling body and a swivel joint of the construction machine of FIG. 25. [Figure 27] FIG. 11 is a side view showing a main part of a construction machine according to still another modified example of the embodiment. [Figure 28] FIG. 11 is a rear view showing a main part of a construction machine according to still another modified example of the embodiment. [Figure 29] FIG. 29 is a side view showing a main part of the construction machine of FIG. 28. [Diagram 30] FIG. 11 is a rear view showing a construction machine according to still another modified example of the embodiment. [Diagram 31] FIG. 11 is a rear view showing a construction machine according to still another modified example of the embodiment. [Diagram 32] FIG. 11 is a plan view showing a construction machine according to still another modified example of the embodiment. [Diagram 33] FIG. 11 is a plan view showing a construction machine according to still another modified example of the embodiment. [Diagram 34] FIG. 11 is a side view showing a construction machine according to still another modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] An embodiment of the present disclosure will be described with reference to the drawings.

[0034] As shown in FIG. 1 and FIG. 2, the construction machine 100 includes a lower traveling body 1 including a traveling device, an upper rotating body 2 supported by the lower traveling body 1 so as to be rotatable relative to the lower traveling body 1 around a vertically extending rotation axis Z, and a working device 3 supported by the upper rotating body 2. The construction machine 100 according to the present embodiment is a hydraulic excavator, but the construction machine in the present disclosure is not limited to a hydraulic excavator and may be other construction machines such as a crane or a bulldozer. The traveling device may be a crawler traveling device shown in FIG. 1, or may be a traveling device having tires not shown. The crawler traveling device includes a crawler frame extending in one direction, two wheels rotatably supported at one end and the other end of the crawler frame, and a crawler belt supported in an annular (endless) shape by the two wheels. The crawler belt includes a number of shoes connected to each other.

[0035] Note that the front-rear direction and the left-right direction shown in the drawings are directions based on the orientation of the upper rotating body 2. Specifically, the front-rear direction is a horizontal direction parallel to the longitudinal direction of the working device 3 in a plan view, and the left-right direction is a horizontal direction perpendicular to the front-rear direction.

[0036] The working device 3 includes a boom 4 that is attached to the upper rotating body 2 so as to be able to rise and fall, an arm 5 that is attached to the boom 4 so as to be able to rotate, and a tip attachment 6 that is attached to the arm 5 so as to be able to rotate. In this embodiment, the tip attachment 6 is a bucket, but the tip attachment may be another tip attachment such as a grapple, a fork, a crusher, or the like.

[0037] The upper rotating body 2 includes a machine body frame 20, a cab 11 supported by the machine body frame 20, a counterweight 12, and an outer wall 13. The outer wall 13 has, for example, a box shape and defines a machine room 14. Various pieces of equipment are housed inside the machine room 14. The various pieces of equipment housed in the machine room 14 will be described later. The upper rotating body 2 is an example of a machine body.

[0038] The machine frame 20 is a member supported by the lower traveling body 1 so as to be rotatable. The machine frame 20 includes a frame main body 21 and a rising body 22. The frame main body 21 supports the cab 11 and the outer wall 13. The frame main body 21 has an upper surface that extends in the front-rear and left-right directions and is large enough to support the cab 11 and the outer wall 13. The rising body 22 supports the boom 4 so that it can be raised and lowered. The rising body 22 includes a boom mounting portion 22A to which the base end portion 4A of the boom 4 shown by the dashed line in FIG. 1 is attached. The boom mounting portion 22A constitutes the front portion of the rising body 22.

[0039] The cab 11 is disposed, for example, at the left front portion of the frame body 21. is a weight for balancing, and is attached to the rear of the frame body 21 or to the frame body 21. The cab 11 is equipped with the driver's seat, control levers, and control pedals. will be done.

[0040] 1, the rising body 22 has a shape that rises from the frame main body 21 and extends in the front-rear direction. The rising body 22 includes a rear portion 22B located rearward of the boom mounting portion 22A (front portion). The rear portion 22B is located rearward of the boom mounting portion 22A and is lower in height than the boom mounting portion 22A.

[0041] 1, 2 and 3, the standing body 22 includes left and right standing plates 23, 23 that face each other at a distance from each other on the left and right sides. Each of the left and right standing plates 23, 23 is a plate-like member that stands from the frame main body 21 and is disposed so as to extend in the front-rear direction.

[0042] The construction machine 100 includes a plurality of actuators. Each of the plurality of actuators operates by receiving a supply of hydraulic oil discharged from a hydraulic pump 62 described below. The plurality of actuators include a boom cylinder 7 for raising and lowering the boom 4, an arm cylinder 8 for rotating the arm 5, a tip attachment cylinder 9 for rotating the tip attachment 6, and a hydraulic motor 64 for rotating the upper rotating body 2 relative to the lower traveling body 1.

[0043] The machinery room 14 accommodates a plurality of equipment groups, which will be described later. The machinery room 14 is formed in a space on the upper surface of the frame body 21, excluding an area in which the cab 11 is arranged, an area in which the base end 4A of the boom 4 is attached, and an area in which the counterweight 12 is arranged. The machinery room 14 may be formed, for example, in a rear space behind the cab 11, or in a side space to the side (for example, to the right) of the cab 11, or in both the rear space and the side space. Note that, when the weight of the equipment accommodated inside the machinery room 14 is large, the counterweight 12 can be omitted.

[0044] The outer wall 13 has, for example, a box shape and defines a machine room 14. As shown in Figs. 1 and 2, an air intake port 16 and an exhaust port 17 are formed in the outer wall 13. The air intake port 16 is an opening for drawing air outside the machine room 14 into the inside of the machine room 14 as cooling air CA. The exhaust port 17 is an opening for discharging the cooling air CA inside the machine room 14 to the outside of the machine room 14. The locations where the air intake port 16 and the exhaust port 17 are formed are not particularly limited, but in this embodiment, the air intake port 16 is formed in a side portion (e.g., a right side portion) of the outer wall 13, and the exhaust port 17 is formed in the other side portion (e.g., a left side portion) of the outer wall 13.

[0045] The construction machine 100 includes a plurality of equipment groups. The plurality of equipment groups include a hydrogen equipment group 40, a high-voltage equipment group 50, a hydraulic equipment group 60, and a cooling equipment group 70. In the specific example shown in Fig. 2, the hydrogen equipment group 40 is arranged in an area near the center of the rear of the upper rotating body 2, the cooling equipment group 70 is arranged in an area near the left side of the rear of the upper rotating body 2, and the high-voltage equipment group 50 and the hydraulic equipment group 60 are arranged in other areas, but the areas in which each equipment group is arranged are not limited to the specific example shown in Fig. 2.

[0046] The hydrogen equipment group 40 includes a hydrogen tank 41, a fuel cell device 42, and a hydrogen fill port 44. The hydrogen tank 41 is connected to the fuel cell device 42 via a fuel pipe 40A. The hydrogen fill port 44 is connected to the hydrogen tank 41 via a hydrogen fill pipe 40B.

[0047] The hydrogen tank 41 is a container for storing hydrogen. In this embodiment, the hydrogen tank 41 is disposed above the fuel cell device 42. The hydrogen tank 41 may be supported by a tank support member (not shown) in the machine room 14. A pressure reducing valve 45 may be disposed in the fuel pipe 40A. In this case, the high-pressure hydrogen stored in the hydrogen tank 41 is reduced in pressure reducing valve 45. The reduced-pressure hydrogen is supplied to the fuel cell device 42 via the fuel pipe 40A.

[0048] The fuel cell device 42 includes a fuel cell 42A. The fuel cell 42A generates electricity (power) by electrochemically reacting hydrogen supplied from a hydrogen tank 41 with oxygen (e.g., oxygen contained in air). The fuel cell 42A may be configured, for example, by a fuel cell stack including a plurality of cells.

[0049] The hydrogen filling port 44 has a filling opening that communicates with the hydrogen filling pipe 40B. In the filling operation of filling the hydrogen tank 41 with hydrogen, a nozzle of a hydrogen gas filling device (not shown) is connected to the hydrogen filling port 44 to fill the hydrogen tank 41 with hydrogen. When filling of the hydrogen tank 41 with hydrogen is completed, the nozzle of the hydrogen gas filling device is removed from the hydrogen filling port 44.

[0050] The high-voltage equipment group 50 includes an inverter 51 and an electric motor 52. The inverter 51 is connected to the fuel cell device 42 by a cable (not shown). The inverter 51 is connected to the electric motor 52 by a cable (not shown).

[0051] The inverter 51 converts the direct current supplied from the fuel cell device 42 into a three-phase alternating current and supplies it to the electric motor 52. The inverter 51 adjusts the rotation speed of the electric motor 52.

[0052] The electric motor 52 is a drive source that drives the hydraulic pump 62. The electric motor 52 is operated by receiving a supply of electric power from the fuel cell device 42 via an inverter 51. The electric motor 52 is formed of, for example, a three-phase motor.

[0053] The high-voltage equipment group 50 may further include a battery 53. The battery 53 may be, for example, a lithium-ion battery or another type of battery. The electric motor 52 may be operated by receiving power output from the battery 53 via an inverter 51. The inverter 51 may convert the direct current supplied from the battery 53 into a three-phase alternating current and supply it to the electric motor 52. The battery 53 may also be charged by receiving power from the fuel cell device 42.

[0054] The high-voltage equipment group 50 may further include a repeater 55 (junction box). The repeater 55 has a function of combining the power output by the fuel cell device 42 and the power output by the battery 53, and a function of distributing the power to a plurality of high-voltage equipment such as the inverter 51 and a converter 54 described later.

[0055] The high-voltage equipment group 50 may further include a converter 54 (DCDC converter). The converter 54 steps down the high voltage output from the repeater 55. The converter 54 supplies the stepped-down low-voltage power to the low-voltage equipment group.

[0056] The hydraulic equipment group 60 includes a hydraulic oil tank 61, a hydraulic pump 62, a control valve 63, and a hydraulic motor 64. The hydraulic oil tank 61 is a container that stores hydraulic oil. The hydraulic pump 62 is driven by the electric motor 52 to discharge hydraulic oil. The hydraulic pump 62 is connected to the electric motor 52 via a shaft connection coupling (not shown). The hydraulic motor 64 is operated by receiving hydraulic oil from the hydraulic pump 62 via a control valve 63. The control valve 63 opens and closes in response to a lever operation or pedal operation provided by an operator to an operating device (not shown) so that hydraulic oil from the hydraulic pump 62 is supplied to an actuator corresponding to the operation.

[0057] The cooling equipment group 70 includes a cooling fan 71 and a heat exchanger. The heat exchanger may include at least one of an oil cooler 72 and a radiator 73.

[0058] The cooling fan 71 forms a flow of cooling air CA in the machine room 14. That is, the cooling fan 71 forms a flow of cooling air CA in the machine room 14 from the intake port 16 to the exhaust port 17. The cooling fan 71 has an impeller including a rotating shaft portion and a plurality of blade portions arranged along the outer periphery of the rotating shaft portion, and a fan motor that drives the impeller. The impeller of the cooling fan 71 rotates when power is supplied to the fan motor from the fuel cell device 42 or the battery 53 via the repeater 55, for example. The cooling fan 71 may further have a shroud that is arranged to surround the impeller.

[0059] The oil cooler 72 may be configured to cool the hydraulic oil discharged from the devices included in the hydraulic equipment group 60. The hydraulic oil discharged from the control valve 63 reaches the oil cooler 72 via an oil cooler hose (not shown), where it is cooled by heat exchange with the cooling air CA, and then returns to the hydraulic oil tank 61 via an oil cooler hose (not shown). This cools the hydraulic oil.

[0060] The radiator 73 may be configured to cool the fuel cell device 42. Specifically, for example, the radiator 73 may be connected to the fuel cell device 42 via radiator hoses 74, 75. Cooling water is circulated between the fuel cell device 42 and the radiator 73 by a water pump. The cooling water is cooled by exchanging heat with the cooling air CA in the radiator 73 and is supplied to the fuel cell device 42 via the radiator hose 74, whereby the fuel cell device 42 is cooled by the cooling water. The cooling water that has passed through the fuel cell device 42 returns to the radiator 73 via the radiator hose 75.

[0061] The multiple device groups may further include a low-voltage device group. The low-voltage device group may include, for example, the water pump and the controller 90. The water pump circulates the cooling water between the fuel cell device 42 and the radiator 73 through radiator hoses 74, 75.

[0062] The controller 90 controls the operation of the construction machine 100. The controller 90 includes a computer including an arithmetic processing unit and a memory. The controller 90 is configured to control the operation of the construction machine 100 by the arithmetic processing unit executing a program stored in the memory.

[0063] Next, features of the construction machine 100 according to this embodiment shown in Figs. 1 to 5 will be described.

[0064] [First feature] The construction machine 100 according to this embodiment has the following first characteristic. That is, the fuel cell device 42 has an device drain outlet 43, the construction machine 100 has a drain pipe 30 connected to the device drain outlet 43, and the drain pipe 30 is arranged at a position below the height of the device drain outlet 43. In the construction machine 100 having this first characteristic, water discharged from the fuel cell device 42 is less likely to stagnate in the drain pipe 30 compared to, for example, a case in which the drain pipe 30 is arranged facing upward toward the top of the upper rotating body 2 (machine body).

[0065] By making it difficult for water to accumulate in the drain pipe 30, it is possible to prevent the water in the drain pipe 30 from freezing in a low-temperature environment of, for example, 0° C. or below. In addition, by making it difficult for water to accumulate in the drain pipe 30, it is possible to prevent water from accumulating inside the fuel cell device 42. By making it difficult for water to accumulate inside the fuel cell device 42, it is possible to prevent the reaction between hydrogen and oxygen in the fuel cell from being hindered.

[0066] The drain pipe 30 has a pipe inlet 31 connected to the device drain outlet 43, and the drain pipe 30 is located at a height equal to or lower than the pipe inlet 31. The drain pipe 30 may be arranged so that the entire drain pipe 30 is at the same height as the device drain outlet 43, but it is preferable that the pipe inlet 31 of the drain pipe 30 and the base end portion thereof, which is the portion adjacent to the pipe inlet 31, are at the same height as the device drain outlet 43, and the portion other than the pipe inlet 31 and the base end portion is lower than the device drain outlet 43.

[0067] The fuel cell device 42 may include a case 42B that houses the fuel cell 42A, and in this case, the device drain outlet 43 may be formed in the case 42B. In this embodiment, the device drain outlet 43 is formed in the side surface of the case 42B, but the position where the device drain outlet 43 is formed is not limited to the side surface of the case 42B, and may be, for example, the bottom surface or the top surface of the case 42B. More specifically, the device drain outlet 43 is formed in the lower part of the side surface of the case 42B.

[0068] In the fuel cell device 42, water (water vapor) is generated by a chemical reaction, and the generated water is discharged from the device drain outlet 43. The water discharged from the device drain outlet 43 of the fuel cell device 42 may contain both liquid water and gaseous water (water vapor), or may contain only either liquid water or gaseous water (water vapor). The water vapor discharged from the device drain outlet 43 may become condensed water in the drain pipe 30.

[0069] [Second feature] The construction machine 100 according to this embodiment further includes the following second feature. That is, in the construction machine 100, the drain pipe 30 has a pipe drain outlet 32, and the pipe drain outlet 32 ​​is located lower than the device drain outlet 43. In this case, water in the drain pipe 30 is more easily discharged from the pipe drain outlet 32, so that water is less likely to stagnate in the drain pipe 30.

[0070] The drain pipe 30 preferably has a shape that encourages the water in the drain pipe 30 to flow toward the pipe drain outlet 32 ​​by its own weight. The drain pipe 30 in this embodiment does not have a portion (a portion extending upward parallel to the vertical direction and a portion extending diagonally upward) that extends upward from the pipe inlet 31, which is the upstream end of the drain pipe 30 connected to the device drain outlet 43, toward the pipe drain outlet 32, which is the downstream end from which the water in the drain pipe 30 is discharged, and is configured to be at the same height as the device drain outlet 43 or lower than the device drain outlet 43 throughout the entire drain pipe 30. In other words, when the direction in which water flows from the pipe inlet 31 to the pipe drain outlet 32 ​​is referred to as the water flow direction, in the water flow direction, the drain pipe 30 does not have a portion that extends upward (a portion that extends upward parallel to the vertical direction and a portion that extends diagonally upward).

[0071] When the device drain outlet 43 is formed on the side of the fuel cell device 42 (side of the case 42B) as in this embodiment, the drain pipe 30 may include a horizontal portion 30A (upstream horizontal portion 30A) that extends horizontally from the device drain outlet 43 and a downward portion 30B that extends downward from the horizontal portion 30A, in which case the pipe drain outlet 32 ​​may be formed in the downward portion 30B. Although not shown, when the device drain outlet 43 is formed on the bottom surface of the fuel cell device 42 (bottom surface of the case 42B), the drain pipe 30 may include a downward portion that extends downward from the device drain outlet 43, in which case the horizontal portion can be omitted.

[0072] In this embodiment, "downward" may be parallel to the vertical direction or inclined downward (diagonally downward). That is, the downward portion 30B of the drain pipe 30 may include at least one of a portion extending downward parallel to the vertical direction and a portion extending diagonally downward. The downward portion 30B may also include at least one of a portion extending downward in a straight line and a portion extending downward while curving. In the specific example shown in FIG. 4 and FIG. 5, the downward portion 30B includes a portion extending diagonally downward from the horizontal portion 30A and a portion extending downward parallel to the vertical direction from the portion, but the shape of the drain pipe 30 is not limited to the specific example shown in FIG. 4 and FIG. 5.

[0073] [Third feature] The construction machine 100 according to this embodiment further includes a third feature as follows: That is, in the construction machine 100, the pipe drain outlet 32 ​​is formed at the lowest part of the drain pipe 30. In this case, the water in the drain pipe 30 flows toward the lowest part of the drain pipe 30 and is smoothly discharged from the pipe drain outlet 32 ​​formed at the lowest part.

[0074] [Fourth feature] The construction machine 100 according to this embodiment further includes the following fourth feature. That is, in the construction machine 100, the drain pipe 30 extends toward the opening 24 formed in the machine frame 20 (specifically, the frame main body 21), and the pipe drain outlet 32 ​​is disposed at the opening 24 or disposed below the opening 24. In this case, water in the drain pipe 30 can be discharged below the machine frame 20 from the pipe drain outlet 32 ​​disposed at the opening 24 or the pipe drain outlet 32 ​​disposed below the opening 24. As a result, water is not discharged from the drain pipe 30 into the machine room 14 of the upper rotating body 2.

[0075] The drain pipe 30 is inserted through an opening 24 formed in the aircraft frame 20 , and the pipe drain outlet 32 ​​may be located below the opening 24 .

[0076] The frame body 21 of the vehicle frame 20 is located below the fuel cell device 42. The fuel cell device 42 is supported by the vehicle frame 20 by being disposed on the frame body 21 of the vehicle frame 20. In the specific example shown in Figs. 3 to 5, the vehicle frame 20 has an device support member 25 fixed onto the frame body 21, and the fuel cell device 42 is supported by this device support member 25. The device support member 25 may include a plurality of legs (for example, four legs) and a top plate supported by the plurality of legs, and in this case, the fuel cell device 42 may be disposed on the top plate. Each of the plurality of legs may include a mount for suppressing transmission of vibration to the fuel cell device 42.

[0077] [Fifth feature] The construction machine 100 according to this embodiment further includes the following fifth feature. That is, in the construction machine 100, the machine body frame 20 includes at least one structural member and at least one non-structural member. The opening 24 of the machine body frame 20 may be formed in the non-structural member, or may be formed between the structural member and the non-structural member. In this case, water in the drain pipe 30 can be discharged from the pipe drain port 32 to the bottom of the machine body frame 20 without forming an opening in the structural member of the machine body frame 20.

[0078] The structural member is a member that resists a load and provides rigidity and strength to the aircraft frame 20 among the multiple members that constitute the aircraft frame 20, and may be, for example, a member such as a beam or a column. The non-structural member is a member that contributes less to providing rigidity and strength to the aircraft frame 20 than the structural member. The at least one structural member may include, for example, multiple beams. The multiple beams may include, for example, one or more longitudinal beams extending forward and backward. The multiple longitudinal beams may include a right longitudinal beam 28 disposed at the right end of the aircraft frame 20 and a left longitudinal beam 28 disposed at the left end of the aircraft frame 20, and may include upright plates 23, 23 extending forward and backward. The multiple beams may also include one or more horizontal beams 26 extending left and right. The at least one non-structural member may include, for example, multiple plate-like members 27. Each of the multiple plate-like members 27 may be disposed so as to straddle, for example, adjacent horizontal beams 26, 26.

[0079] The opening 24 of the aircraft frame 20 is an area that penetrates the aircraft frame 20 in the up-down direction. The opening 24 may be a through hole formed in the plate-like member 27, may be a gap formed between the cross beam 26 and the plate-like member 27, or may be a gap formed between the upright plate 23 and the plate-like member 27. The opening 24 may also be a gap formed between two structural members, or may be a gap formed between two non-structural members.

[0080] [6th feature] The construction machine 100 according to this embodiment further includes the following sixth feature. That is, in the construction machine 100, the drainage pipe 30 has a downward portion 30B that is a portion that extends downward at a position that avoids the structural member. In this case, the pipe drain outlet 32 ​​can be arranged in the opening 24 formed in the machine body frame 20 while satisfying the constraint condition that no opening is formed in the structural member of the machine body frame 20 and suppressing the length of the drainage pipe 30 from increasing, or the pipe drain outlet 32 ​​can be positioned below the opening 24 by inserting the drainage pipe 30 into the opening 24. This makes it possible to reduce pressure loss in the drainage pipe 30, and makes it difficult for the drainage efficiency of the drainage pipe 30 to decrease. The pipe drain outlet 32 ​​may be formed at the lower end of the downward portion 30B. In addition, it is preferable that the downward portion 30B of the drainage pipe 30 is arranged so as to extend downward at a position adjacent to the structural member. This makes it possible to arrange the drainage pipe 30 in the shortest route while satisfying the constraint condition.

[0081] In this embodiment, as shown in Figures 2 and 3, the fuel cell device 42 is disposed at a position overlapping at least a portion of the standing block 22 in a plan view. Specifically, the fuel cell device 42 is disposed directly above the rear portion 22B of the standing block 22. The pipe inlet 31 of the drain pipe 30 is connected to an apparatus drain outlet 43 formed on the side of the fuel cell device 42. The downward portion 30B of the drain pipe 30 extends downward at a position avoiding one of the standing plates 23 (the right standing plate 23) and adjacent to the side surface (right side surface) of the standing plate 23, and is inserted into an opening 24 formed at a position adjacent to the standing plate 23.

[0082] [Variations] Next, the features of the construction machine 100 according to Modifications 1 to 3 of this embodiment will be described with reference to Figs. 6 to 21. The construction machines 100 according to Modifications 1 to 3 each have the first to sixth features described above, and further have the seventh to eleventh features described below. Figs. 6 to 10 are diagrams for explaining the features of the construction machine 100 according to Modification 1, Figs. 11 to 15 are diagrams for explaining the features of the construction machine 100 according to Modification 2, and Figs. 16 to 21 are diagrams for explaining the features of the construction machine 100 according to Modification 3.

[0083] [7th feature] Each of the construction machines 100 according to the first to third modifications further includes a drainage receiver 80 that receives water guided by the drain pipe 30. In the first to third modifications, the drainage receiver 80 is disposed in a position to receive water discharged from the pipe drain outlet 32 ​​of the drain pipe 30.

[0084] The drainage receiver 80 has at least one of a storage function, a gas-liquid separation function, a scattering prevention function, and a protection function. The storage function is a function of storing water discharged from the drain pipe 30 and flowing into the drainage receiver 80, and the gas-liquid separation function is a function of separating water discharged from the drain pipe 30 and flowing into the drainage receiver 80 into liquid water and gaseous water (water vapor). The scattering prevention function is a function of preventing water discharged from the pipe drain outlet 32 ​​of the drain pipe 30 from scattering to the surroundings. By preventing water from the pipe drain outlet 32 ​​from scattering to the surroundings, water is less likely to splash on various components around the pipe drain outlet 32, such as the machine frame 20, the slewing bearing, and the frame of the lower running body 1 (car body, axle, etc.). This can reduce the cost of performing rust prevention treatment on the components. The protective function is an undercover function that protects the drain pipe 30 by preventing stones, rocks, metal parts (e.g., steel materials) on the ground from colliding with the drain pipe 30 from below the body frame 20.

[0085] When the wastewater receiver 80 has a storage function, the wastewater receiver 80 does not necessarily have a receiver drain outlet, which is a drain outlet of the wastewater receiver 80. In this case, an operator or other worker may perform the task of draining the water stored in the wastewater receiver 80 from the wastewater receiver 80 when a certain amount of water has accumulated in the wastewater receiver 80.

[0086] The drainage receiver 80 may be a box-shaped container having an upper wall 80A, a lower wall 80B, and a side wall 80C, as in Modification 1 shown in Figures 6 and 7, Modification 2 shown in Figures 11 and 12, and Modification 3 shown in Figures 16 and 17. Each of the drainage receivers 80 in Modifications 1 to 3 is disposed in a position capable of receiving water discharged from the pipe drain outlet 32 ​​of the drain pipe 30. As a result, each drainage receiver 80 has a storage function, a splash suppression function, and a protection function.

[0087] Since the drainage receiver 80 has not only the lower wall 80B and the side wall 80C but also the upper wall 80A, water vapor within the drainage receiver 80 can be prevented from entering the machine room 14 through the opening 24.

[0088] The drainage receiver 80 in the first to third modifications further includes features according to an eighth aspect which will be described next.

[0089] [8th feature] In each of the construction machines 100 according to the first to third modifications, the wastewater receiver 80 has a storage section 84 capable of storing water, and a receiver drain outlet 82 capable of discharging the water stored in the storage section 84. In this case, each wastewater receiver 80 has a storage function for temporarily storing water, and also has a function for discharging a portion of the water stored in the wastewater receiver 80 from the receiver drain outlet 82.

[0090] First, we will explain Modification 1. The drainage receiver 80 in Modification 1 shown in Figures 6 and 7 is attached to the underside of the frame body 21 of the machine frame 20 as shown in Figure 8. This drainage receiver 80 has a receiver inlet 85 for receiving water from the pipe drain outlet 32 ​​of the drain pipe 30, and a receiver drain outlet 82. The receiver inlet 85 is formed in an upper wall 80A of the drainage receiver 80, and the receiver drain outlet 82 is formed in a lower wall 80B of the drainage receiver 80.

[0091] The drain pipe 30 is connected to the receiver inlet 85. Specifically, a downward portion 30B of the drain pipe 30 is connected to a portion of the upper wall 80A of the wastewater receiver 80 that corresponds to the receiver inlet 85.

[0092] The lower wall 80B includes a first lower wall 80B1 located at a position corresponding to the storage portion 84, and a second lower wall 80B2 located at a position shifted laterally from the first lower wall 80B1. The first lower wall 80B1 is located lower than the second lower wall 80B2. As a result, water flowing into the drainage receiver 80 is stored in the storage portion 84. In the specific example shown in Figures 6 and 7, the receiver drain port 82 is formed in the first lower wall 80B1, but may be formed in the second lower wall 80B2.

[0093] 7, the receiver drain outlet 82 is formed at a position horizontally offset from the receiver inlet 85. Therefore, even when the receiver drain outlet 82 is formed in the first lower wall 80B1, the water flowing into the drainage receiver 80 from the receiver inlet 85 is temporarily stored in the storage section 84 at least while the water travels from the receiver inlet 85 to the receiver drain outlet 82. When the receiver drain outlet 82 is formed in the second lower wall 80B2, that is, when the receiver drain outlet 82 is formed at a position higher than the bottom surface of the storage section 84, the water can be stored in the storage section 84 until the height of the water stored in the storage section 84 (water level) reaches the height of the receiver drain outlet 82.

[0094] In the first modification, as shown in Fig. 10, when the upper rotating body 2 is disposed in a posture in which the direction in which the crawler traveling device of the lower traveling body 1 extends (the direction in which the crawler frame extends) coincides with the front-rear direction of the upper rotating body 2, the position of the receiver drain outlet 82 may be set so that the water discharged from the receiver drain outlet 82 does not splash on the lower traveling body 1 (e.g., the crawler traveling device). When the upper rotating body 2 swings relative to the lower traveling body 1, as shown in Fig. 9, the water discharged from the receiver drain outlet 82 may splash on the lower traveling body 1 (e.g., the crawler traveling device).

[0095] Next, a description will be given of Modification 2. The drainage receiver 80 in Modification 2 shown in Figures 11 and 12 is attached to the underside of the frame body 21 of the machine frame 20 as shown in Figure 13. This drainage receiver 80 has a receiver inlet 85 for receiving water from the pipe drain outlet 32 ​​of the drain pipe 30, and a receiver drain outlet 82. The receiver inlet 85 is formed in an upper wall 80A of the drainage receiver 80.

[0096] The bottom wall 80B of the wastewater receiver 80 has a polygonal (e.g., quadrilateral) shape having multiple sides in a plan view, and there is no side wall in a portion corresponding to at least one of the multiple sides. At least a part of the area (opening) corresponding to the portion without the side wall functions as the receiver drain outlet 82. In the specific example shown in Figs. 12 and 14, the bottom wall 80B of the wastewater receiver 80 is disposed in an inclined position relative to the horizontal plane, so that the portion corresponding to the end of the lowest part of the bottom wall 80B functions as the receiver drain outlet 82. The receiver drain outlet 82 may be formed by a through hole penetrating the bottom wall 80B of the wastewater receiver 80.

[0097] As shown in FIG. 12, the lower end of the drain pipe 30 is adjacent to or connected to the upper surface of the lower wall 80B of the drain receiver 80. Specifically, the lower end of the downward portion 30B of the drain pipe 30 is adjacent to or connected to the upper surface of the lower wall 80B of the drain receiver 80. Of the lower end of the downward portion 30B, a portion 301 close to the receiver outlet 82 is located closer to the upper surface of the lower wall 80B of the drain receiver 80 than the other portions. Specifically, the portion 301 is connected to the upper surface of the lower wall 80B, and the portions other than the portion 301 are spaced upward from the upper surface of the lower wall 80B. The area spaced upward from the upper surface of the lower wall 80B functions as the pipe outlet 32 ​​of the drain pipe 30. In the specific example shown in FIG. 11, the lower end of the downward portion 30B of the drain pipe 30 is located at a position corresponding to the end of the lower wall 80B of the drain receiver 80, but the relative position of the lower end of the downward portion 30B with respect to the drain receiver 80 is not limited to the specific example shown in FIG. 11. As shown in FIG. 11, the pipe outlet 32 ​​of the drain pipe 30 is formed at a position offset horizontally from the receiver outlet 82 .

[0098] The lower wall 80B of the drainage receiver 80 is positioned at an angle relative to the horizontal plane, so that water flowing into the drainage receiver 80 from the pipe drain outlet 32 ​​of the drain pipe 30 is temporarily stored in the storage section 84 at least until the water travels from the pipe drain outlet 32 ​​to the receiver drain outlet 82.

[0099] In the second modification, as shown in Fig. 15, when the upper rotating body 2 is disposed in a posture in which the extension direction of the crawler traveling device of the lower traveling body 1 (extension direction of the crawler frame) coincides with the front-rear direction of the upper rotating body 2, the position of the receiver drain outlet 82 may be set so that the water discharged from the receiver drain outlet 82 does not splash on the lower traveling body 1 (e.g., the crawler traveling device). When the upper rotating body 2 swings relative to the lower traveling body 1, as shown in Fig. 14, the water discharged from the receiver drain outlet 82 may splash on the lower traveling body 1 (e.g., the crawler traveling device).

[0100] Next, a description will be given of Modification 3. The drainage receiver 80 in Modification 3 shown in Figures 16 and 17 is attached to the underside of the frame body 21 of the machine frame 20 as shown in Figure 18. This drainage receiver 80 has a receiver inlet 85 for receiving water from the pipe drain outlet 32 ​​of the drain pipe 30, and a receiver drain outlet 82. The receiver inlet 85 is formed in an upper wall 80A of the drainage receiver 80.

[0101] In the specific example shown in FIG. 17, the lower wall 80B includes a first lower wall 80B1 located at a position corresponding to the storage portion 84, and a second lower wall 80B2 located at a position shifted laterally from the first lower wall 80B1. The first lower wall 80B1 is located lower than the second lower wall 80B2. As a result, water flowing into the drainage receiver 80 is stored in the storage portion 84. In the specific example shown in FIG. 17, the receiver drain outlet 82 is formed in or near the first lower wall 80B1, but may be formed in the second lower wall 80B2. In the specific example shown in FIG. 17, the receiver drain outlet 82 is formed in the boundary portion between the lower wall 80B and the side wall 80C, but the position where the receiver drain outlet 82 is formed is not limited to the specific example shown in FIG. 16. In the specific example shown in Fig. 19, the bottom wall 80B of the wastewater receiver 80 is disposed at an angle with respect to the horizontal plane, and a receiver drain outlet 82 is formed in a portion corresponding to the end of the lowest portion of the bottom wall 80B. As shown in Fig. 17, the wastewater receiver 80 may be provided with a partition 80D that separates the space within the wastewater receiver 80 into a storage section 84 and the other portion.

[0102] In the third modification, as shown in Fig. 16 and Fig. 21, the drain pipe 30 includes a downstream horizontal portion 30C that is a portion that extends horizontally between the lower surface of the machine body frame 20 and the bottom surface of the drain receiver 80 (the upper surface of the lower wall 80B), and the pipe drain outlet 32 ​​is formed at the tip of the downstream horizontal portion 30C. The downstream horizontal portion 30C will be described later.

[0103] In the third modification, as shown in Fig. 20, when the upper rotating body 2 is disposed in a posture in which the direction in which the crawler traveling device of the lower traveling body 1 extends (the direction in which the crawler frame extends) coincides with the front-rear direction of the upper rotating body 2, the position of the receiver drain outlet 82 may be set so that the water discharged from the receiver drain outlet 82 does not splash on the lower traveling body 1 (e.g., the crawler traveling device). When the upper rotating body 2 swings relative to the lower traveling body 1, as shown in Fig. 19, the water discharged from the receiver drain outlet 82 may splash on the lower traveling body 1 (e.g., the crawler traveling device).

[0104] The drainage receiver 80 in the first to third modifications further includes features according to a ninth aspect which will be described next.

[0105] [9th feature] Each of the wastewater receivers 80 in Modification 1 shown in Figures 6 and 7, Modification 2 shown in Figures 11 and 12, and Modification 3 shown in Figures 16 and 17 further has a water vapor outlet 83 for discharging water vapor. Each wastewater receiver 80 can discharge liquid water from the receiver drain outlet 82 and discharge gaseous water (water vapor) from the water vapor outlet 83. In this case, the wastewater receiver 80 has a gas-liquid separation function that separates water discharged from the drain pipe 30 and flowing into the wastewater receiver 80 into liquid water and gaseous water (water vapor), that is, a function of separately discharging the liquid water and water vapor in the wastewater receiver 80.

[0106] [10th Feature] In each of the first to third modifications, the receiver drain outlet 82 is formed in the lower part of the wastewater receiver 80, and the water vapor outlet 83 is formed in the side part of the wastewater receiver 80. In this case, the wastewater receiver 80 can discharge liquid water from the receiver drain outlet 82 formed in the lower part of the wastewater receiver 80, and discharge gaseous water (water vapor) from the water vapor outlet 83 formed in the side part of the wastewater receiver 80. Specifically, this is as follows.

[0107] In the wastewater receiver 80 in the first modified example shown in Figs. 6 and 7, the receiver drain outlet 82 is formed in the lower wall 80B, and the water vapor outlet 83 is formed in the side wall 80C. Specifically, the receiver drain outlet 82 is formed in the first lower wall 80B1 at a position corresponding to the storage section 84 of the lower wall 80B, and the water vapor outlet 83 is formed in the side wall 80C rising from the end of the second lower wall 80B2 at a position higher than the first lower wall 80B1. The water vapor outlet 83 is formed at a position higher than the receiver drain outlet 82. The wastewater receiver 80 can discharge liquid water from the receiver drain outlet 82 at a relatively low position, and discharge gaseous water (water vapor) from the water vapor outlet 83 at a relatively high position. The liquid water in the wastewater receiver 80 falls downward from the receiver outlet 82, and the gaseous water (water vapor) in the wastewater receiver 80 is discharged sideways from the water vapor outlet 83. In the specific example shown in Figures 8 and 9, the wastewater receiver 80 is positioned so that the water vapor in the wastewater receiver 80 is discharged rearward from the water vapor outlet 83, but the discharge direction of the water vapor is not limited to the specific example shown in Figures 8 and 9, and may be other directions such as to the right, left, forward, downward, or upward.

[0108] In the wastewater receiver 80 in the second modification shown in FIG. 11 and FIG. 12, as described above, the receiver drain outlet 82 is configured by at least a part of the opening area corresponding to the part of the multiple sides of the lower wall 80B where no side wall exists. Specifically, the receiver drain outlet 82 is configured by the lowest part of the opening area. Also, the water vapor outlet 83 is configured by the opening area as shown in FIG. 11. The liquid water in the wastewater receiver 80 falls downward from the receiver drain outlet 82, and the gaseous water (water vapor) in the wastewater receiver 80 is discharged to the side from the water vapor outlet 83. In the specific example shown in FIG. 13, the wastewater receiver 80 is disposed so that the water vapor in the wastewater receiver 80 is discharged to the right from the water vapor outlet 83, but the discharge direction of the water vapor is not limited to the specific example shown in FIG. 13 and may be other directions such as backward, left, forward, downward, or upward.

[0109] In the wastewater receiver 80 in the third modified example shown in Figs. 16 and 17, as described above, the receiver drain outlet 82 is formed at the boundary between the bottom wall 80B and the side wall 83C, and the water vapor outlet 83 is formed in the side wall 83C. Liquid water in the wastewater receiver 80 falls downward from the receiver drain outlet 82, and gaseous water (water vapor) in the wastewater receiver 80 is discharged laterally from the water vapor outlet 83. In the specific example shown in Figs. 18 and 19, the wastewater receiver 80 is disposed so that water vapor in the wastewater receiver 80 is discharged rearward from the water vapor outlet 83, but the discharge direction of the water vapor is not limited to the specific example shown in Figs. 18 and 19, and may be other directions such as rightward, leftward, forward, downward, or upward.

[0110] [11th Feature] In the first to third modified examples, the drainage receiver 80 is disposed under the body frame 20 and configured to receive water discharged from the pipe drain outlet 32. In this case, the drainage receiver 80 can receive water discharged from the pipe drain outlet 32 ​​of the drain pipe 30 under the body frame 20. The drainage receiver 80 is attached to the underside of the body frame 20. Each of the drainage receivers 80 in the first to third modified examples has a storage function and a gas-liquid separation function. Furthermore, by being disposed under the body frame 20, each drainage receiver 80 also has a splash suppression function and a protection function. By the drainage receiver 80 having various functions, it is not necessary to arrange a member for each function.

[0111] The construction machine 100 according to the third modified example shown in Figs. 16 to 21 further includes twelfth and thirteenth features which will be described below.

[0112] [12th feature] In the third modification, the drain receiver 80 is disposed under the machine frame 20, the drain pipe 30 includes a downstream horizontal portion 30C extending horizontally between the machine frame 20 (the lower surface of the frame body 21) and the bottom surface of the drain receiver 80 (the upper surface of the lower wall 80B), and the pipe drain outlet 32 ​​is formed at the tip of the downstream horizontal portion 30C. In this case, even if the thickness (vertical dimension) of the drain receiver 80 is designed to be small, it is easier to ensure the distance between the pipe drain outlet 32 ​​and the inner surface of the drain receiver 80 (the inner surface of the side wall 80C) as shown in FIG. 17, compared to the case where the pipe drain outlet 32 ​​is formed at the lower end of the downward extending portion. This makes it possible to reduce the pressure loss when discharging water in the drain pipe 30, thereby suppressing the reduction in the drainage efficiency in the drain pipe 30.

[0113] In the specific example shown in FIG. 16, the drain receiver 80 has not only the lower wall 80B but also the upper wall 80A, so that the downstream horizontal portion 30C of the drain pipe 30 extends horizontally between the upper wall 80A and the lower wall 80B. In the specific example shown in FIG. 17, the downstream horizontal portion 30C of the drain pipe 30 extends horizontally along the first lower wall 80B1 of the lower wall 80B. Specifically, the downstream horizontal portion 30C extends in a direction approaching the steam exhaust port 83. However, the extension direction of the downstream horizontal portion 30C is not limited to the specific example shown in FIG. 17. The downstream horizontal portion 30C may be a drainage change member capable of adjusting the position and direction of the pipe drain port 32 by changing its direction.

[0114] [13th feature] In the third modification, as shown in Fig. 21, the drain pipe 30 has a drain hole 34 on the lower surface of the downstream horizontal portion 30C at a portion upstream of the pipe drain outlet 32. In this case, at least a portion of the water guided to the downstream horizontal portion 30C is discharged from the drain hole 34, so that water retention in the downstream horizontal portion 30C of the drain pipe 30 can be effectively suppressed. In addition, freezing of water in the downstream horizontal portion 30C can also be suppressed.

[0115] In the specific example shown in Fig. 21, the drainage holes 34 are formed in the downstream horizontal portion 30C, directly below the downward portion 30B. However, the formation position of the drainage holes 34 is not limited to the specific example shown in Fig. 21.

[0116] [14th Feature] Next, the features of the construction machine 100 according to Modification 4 of this embodiment will be described with reference to Fig. 22. The construction machine 100 according to Modification 4 has the above-mentioned first to thirteenth features, and further has a fourteenth feature which will be described below. Fig. 22 is a diagram for explaining the features of the construction machine 100 according to Modification 4.

[0117] The construction machine 100 according to the fourth modification further includes a duct 95 into which the water vapor discharged from the water vapor outlet 83 of the wastewater receiver 80 flows. In this fourth modification, the discharge position (relative position) of the water vapor with respect to the machine frame 20 can be changed by changing the length, shape, and orientation of the duct 95. This means that even if there is a member near the wastewater receiver 80 that is prone to rust due to contact with water vapor, the duct 95 can guide the water vapor discharged from the water vapor outlet 83 of the wastewater receiver 80 to a position away from the member that is prone to rust and discharge it from that position to the outside of the duct 95. This makes it possible to prevent water vapor from coming into contact with and condensing on a member that is prone to rust, resulting in the adhesion of water droplets to the member.

[0118] 22, the duct 95 may be configured to guide water vapor toward the vicinity of the outer edge 20E of the aircraft frame 20, or may be configured to guide water vapor to a position further outside than the outer edge 20E. A duct outlet 96 for discharging water vapor is formed at the tip of the duct 95.

[0119] [15th feature] Next, the features of the construction machine 100 according to the fifth modified example of this embodiment will be described with reference to Fig. 23. The construction machine 100 according to the fifth modified example has the first to eleventh features described above, and further has the fifteenth and sixteenth features described below. Fig. 23 is a diagram for explaining the features of the construction machine 100 according to the fifth modified example.

[0120] The construction machine 100 according to the fifth modification further includes a water level sensor 91 that detects the water level in the drainage receiver 80, and a controller 90, and the controller 90 performs control to notify information related to the water level to those involved in the work based on the detection result input from the water level sensor 91. In this case, those involved in the work, such as an operator, can recognize the water level in the drainage receiver 80.

[0121] Specifically, for example, the construction machine 100 may further include a display 92, and the controller 90 may control the operation of the display 92 so that information related to the water level is displayed on the display 92 based on the detection result input from the water level sensor 91. The display 92 may be disposed, for example, inside the cab 11. The display 92 may be included in a portable information device that can be carried to a position away from the construction machine 100, or may be included in an information device that is disposed at a position away from the construction machine 100.

[0122] [16th feature] The construction machine 100 according to the fifth modification further includes a water level sensor 91 that detects the water level in the drainage receiver 80, and a controller 90, and the controller 90 controls the timing of discharging the water stored in the drainage receiver 80 from the drainage receiver 80 based on the detection result input from the water level sensor 91. In this case, the water stored in the drainage receiver 80 is discharged from the drainage receiver 80 at an appropriate timing, even if an operator or other related party does not perform the work of discharging the water stored in the drainage receiver 80 from the drainage receiver 80.

[0123] Specifically, for example, the wastewater receiver 80 may be configured so that the receiver drain outlet 82 can be opened and closed by an opening / closing member 93 as shown in Fig. 23, and in this case, the operation of the opening / closing member 93 is controlled based on commands output from the controller 90. As a result, for example, at a work site where water discharge is regulated, it is possible to prevent water from being discharged into the work site by setting the receiver drain outlet 82 to a closed state, and when the water level in the wastewater receiver 80 becomes high, it is possible to drain or collect water before it overflows from the wastewater receiver 80 by switching the receiver drain outlet 82 to an open state in a place where water can be discharged.

[0124] [17th feature] Next, the features of the construction machine 100 according to the sixth modified example of this embodiment will be described with reference to Fig. 24. The construction machine 100 according to the sixth modified example has the first to tenth features described above, and further has a seventeenth feature which will be described below. Fig. 24 is a diagram for explaining the features of the construction machine 100 according to the sixth modified example.

[0125] In the construction machine 100 according to the sixth modification, the drainage receiver 80 is disposed midway along the drainage pipe 30. Specifically, for example, the drainage pipe 30 includes an upstream portion 30D extending from the device drain outlet 43 to the drainage receiver 80 and a first downstream portion 30E extending from the drainage receiver 80 to the pipe drain outlet 32, and the drainage receiver 80 is disposed above the frame body 21 of the machine frame 20 and is configured to receive water guided by the upstream portion 30D. In addition, the drainage pipe 30 may further include a second downstream portion 30F extending from the drainage receiver 80 to the water vapor outlet 33.

[0126] 24, the first downstream portion 30E is disposed so as to extend downward from the wastewater receiver 80, and the second downstream portion 30F is disposed so as to extend laterally from the wastewater receiver 80. Liquid water in the wastewater receiver 80 is discharged downward from the pipe drain outlet 32 ​​of the first downstream portion 30E, and gaseous water (water vapor) in the wastewater receiver 80 is discharged laterally from the water vapor outlet 33 of the second downstream portion 30F.

[0127] In this sixth modification, the drainage receiver 80 is disposed above the frame body 21 of the machine frame 20, that is, in the machine room 14, so that it is less likely to interfere with members located below the machine frame 20.

[0128] Next, the 18th to 24th features of this embodiment will be described with reference to Figures 25 to 34. The construction machine 100 may have only one of the 18th to 24th features, or may have a plurality of the 18th to 24th features.

[0129] [18th feature] As shown in Figs. 25 and 26, the construction machine 100 includes a lower traveling body 1, an upper rotating body 2, and a swivel joint 200 arranged on the rotating axis Z. The swivel joint 200 has a guide path 204 for receiving water guided by the drain pipe 30 and guiding the water downward. In this case, the water guided by the drain pipe 30 is guided downward through the guide path 204 of the swivel joint 200 arranged on the rotating axis Z, so that the frequency of occurrence of defects such as dirt and corrosion caused by water splashing on structures such as the crawler traveling device of the lower traveling body 1 and the car body is reduced.

[0130] The lower traveling body 1 includes a car body 1A and a pair of left and right crawler traveling devices arranged on the left and right sides of the car body 1A to support the car body 1A. The car body 1A has a swivel bearing 1B arranged around a swivel axis Z. Each crawler traveling device has a crawler frame 1C extending forward and backward, a crawler 1D composed of multiple shoes, and a traveling motor 1E for rotating the crawler 1D.

[0131] The upper rotating body 2 has a machine body frame 20 that is supported on the lower traveling body 1 via a rotating bearing 1B and has an insertion port formed in the center of the rotating bearing 1B. The swivel joint 200 is a joint that is disposed at the center of the upper rotating body 2 to connect multiple upper hydraulic pipes (not shown) connected to hydraulic devices of the upper rotating body 2 and multiple lower hydraulic pipes (not shown) connected to a traveling motor of the lower traveling body 1. The swivel joint 200 has a lower connection part 200A fixed to the car body 1A of the lower traveling body 1, and an upper connection part 200B that is rotatably supported by the lower connection part 200A and protrudes above the machine body frame 20 through the insertion port.

[0132] As shown in Fig. 26, the lower connection part 200A is fixed to the car body 1A. In the lower connection part 200A, a plurality of lower hydraulic pipes (not shown) extending from a hydraulic motor (travel motor) are connected to a lower connection port (not shown) formed in the lower connection part 200A. On the other hand, the upper connection part 200B is fixed to the machine frame 20. In the upper connection part 200B, a plurality of upper hydraulic pipes (not shown) extending from a hydraulic device group are connected to an upper connection port 203 formed in the upper connection part 200B.

[0133] Inside the swivel joint 200, a plurality of oil passages are formed that always maintain communication between the corresponding upper connection ports 203 and lower connection ports, even when the upper connection portion 200B rotates relative to the lower connection portion 200A.

[0134] In this embodiment, the swivel joint 200 further includes the above-mentioned guide passage 204. The guide passage 204 may be, for example, a through hole that passes through the body of the swivel joint 200 in the vertical direction. In the specific example shown in FIG. 25, the guide passage 204 is formed along the pivot axis Z at the center of the swivel joint 200, but may be formed at a position horizontally shifted from the center of the swivel joint 200, or may be formed at a position horizontally shifted from the pivot axis Z. A part 30G of the drain pipe 30 is connected to the upper end of the guide passage 204, and another part 30H of the drain pipe is connected to the lower end of the guide passage 204.

[0135] 25, the construction machine 100 further includes a drain receiver 80 between the fuel cell device 42 and the swivel joint 200, which receives water guided by an upstream portion (not shown) of the drain pipe 30. In this case, the water discharged from the fuel cell device 42 flows in the following order: the fuel cell device 42, the upstream portion of the drain pipe 30, the drain receiver 80, a portion 30G of the drain pipe 30 (middle portion 30G of the drain pipe 30), the swivel joint 200, and another portion 30H of the drain pipe 30 (downstream portion 30H of the drain pipe 30).

[0136] Water discharged from the fuel cell device 42 to the upstream portion of the drain pipe 30 is separated into gas and liquid in the drain receiver 80, and the water vapor is discharged, for example, rearward from the water vapor outlet 83 of the drain receiver 80. The liquid water is guided from the drain receiver 80 through the middle portion 30G of the drain pipe 30 to the upper end of the guide path 204 of the swivel joint 200, and further through the guide path 204 and the downstream portion 30H to be discharged outside from the drain port 32 of the downstream portion 30H. In the specific example of FIG. 25, the drain receiver 80 can be omitted, and in this case, the upstream portion of the drain pipe 30 may be connected to the upper end of the guide path 204 of the swivel joint 200.

[0137] [19th feature] As shown in FIG. 27, the construction machine 100 includes a swivel joint 200 disposed on the rotation axis Z. The drain pipe 30 has a portion 30H extending downward along the outer surface of the swivel joint 200, and the pipe drain port 32 is formed in the portion 30H (for example, the lower end of the portion 30H). In this case, the water guided by the drain pipe 30 is guided downward through the portion 30H of the drain pipe 30 extending downward along the outer surface of the swivel joint 200 and discharged from the pipe drain port 32 formed in the portion 30H, thereby reducing the frequency of defects such as dirt and corrosion caused by water splashing on structures such as the crawler traveling device and the car body 1A.

[0138] [20th feature] As shown in Figures 28 and 29, the construction machine 100 includes a lower traveling body 1 having a carbody 1A, an upper rotating body 2, and a lower drainage receiver 88 supported by the carbody 1A and receiving water guided by a part 30G of the drainage pipe 30. In this case, the water guided by the drainage pipe 30 can be received in the lower drainage receiver 88 supported by the carbody 1A, so that the water is prevented from splashing onto the carbody 1A and surrounding structures. The lower drainage receiver 88 is disposed midway along the drainage pipe 30.

[0139] 28 and 29, the lower drainage receiver 88 has a ring shape surrounding the pivot axis Z. In this case, the lower drainage receiver 88 can receive water guided by the drain pipe 30 regardless of the pivot angle of the upper pivot body 2 relative to the lower running body 1.

[0140] 28 and 29, the construction machine 100 further includes a drainage receiver 80 between the fuel cell device 42 and the lower drainage receiver 88, which receives water guided by an upstream portion (not shown) of the drainage pipe 30. In this case, the water discharged from the fuel cell device 42 flows through the fuel cell device 42, the upstream portion of the drainage pipe 30, the drainage receiver 80, a portion 30G of the drainage pipe 30 (the downstream portion 30G of the drainage pipe 30), and the lower drainage receiver 88 in this order.

[0141] Water discharged from the fuel cell device 42 to the upstream portion of the drain pipe 30 is separated into gas and liquid in the drain receiver 80, and the water vapor is discharged, for example, rearward from a water vapor outlet 83 of the drain receiver 80. The liquid water is guided from the drain receiver 80 through the downstream portion 30G of the drain pipe 30 to the lower drain receiver 88. It should be noted that in the specific examples of Figures 28 and 29, the drain receiver 80 can be omitted, and in this case, the upstream portion of the drain pipe 30 may be connected to the lower drain receiver 88.

[0142] [21st Feature] In the construction machine 100, the lower drainage receiver 88 has a lower storage section 86, which is a storage section capable of storing water, and a lower receiver drain port 87 capable of discharging the water stored in the lower storage section 86. The lower storage section 86 occupies the majority of the lower drainage receiver 88, and has, for example, a ring shape. In this embodiment, water can be temporarily stored in the lower storage section 86, and the stored water can be drained from the lower receiver drain port 87.

[0143] The construction machine 100 may further include a water level sensor 91 that detects the water level in the lower receiver drain outlet 87, and a controller 90. In this case, the controller 90 may perform control to notify information related to the water level to people involved in the work based on the detection result input from the water level sensor 91. The controller 90 may also control the timing of discharging water stored in the lower storage section 86 of the lower drainage receiver 88 from the lower storage section 86 (for example, the timing of opening and closing the lower receiver drain outlet 87) based on the detection result input from the water level sensor 91.

[0144] [22nd feature] As shown in FIG. 30, the construction machine 100 includes a lower traveling body 1, an upper revolving body 2, and a water vapor exhaust port 83 for exhausting water vapor contained in water guided by a drain pipe 30. The upper revolving body 2 includes an outer wall 13 that defines a machine room 14. An exhaust port 17 for exhausting air inside the machine room 14 is formed in the outer wall 13. The water vapor exhaust port 83 is configured to exhaust water vapor in a direction along the exhaust direction of air exhausted from the exhaust port 17. In this embodiment, the water vapor exhaust port 83 exhausts water vapor in a direction along the exhaust direction of air exhausted from the exhaust port 17, so that the exhausted water vapor tends to move away from the construction machine 100. This prevents the exhausted water vapor from entering the inside of the construction machine 100 again.

[0145] In the specific example of FIG. 30, the exhaust port 17 and the water vapor exhaust port 83 are formed, for example, on the left side of the right side, left side, rear side, and front side of the construction machine 100. In addition, in the specific example of FIG. 30, a heat exchanger is arranged inside the machine room 14. The heat exchanger may include at least one of the oil cooler 72 and the radiator 73, as in the embodiment shown in FIG. 2. The temperature of the air discharged from the exhaust port 17 is higher than the outside air temperature. In this case, the water vapor discharged from the water vapor exhaust port 83 mixes with the high-temperature air discharged from the exhaust port 17, thereby suppressing condensation of the water vapor, and therefore, for example, the frequency of poor visibility caused by condensation of the water vapor in winter can be reduced.

[0146] 30, the water vapor outlet 83 is formed at the end of a downstream portion 30G that is a part of the drainage pipe 30. The construction machine 100 also includes a drainage receiver 80 between the fuel cell device 42 and the downstream portion 30G of the drainage pipe 30, for receiving water guided by an upstream portion (not shown) of the drainage pipe 30. In this case, the water discharged from the fuel cell device 42 flows through the fuel cell device 42, the upstream portion of the drainage pipe 30, the drainage receiver 80, and the downstream portion 30G of the drainage pipe 30 in this order.

[0147] Water discharged from the fuel cell device 42 to the upstream portion of the drain pipe 30 is separated into gas and liquid in the drain receiver 80, and the liquid water is discharged to the outside from the receiver drain outlet 82 of the drain receiver 80. Water vapor passes from the drain receiver 80 through the downstream portion 30G of the drain pipe 30 and is discharged to the outside from the water vapor outlet 83. It should be noted that in the specific example of FIG. 30, the drain receiver 80 can be omitted, and in this case, the upstream portion of the drain pipe 30 may be connected to the downstream portion 30G of the drain pipe 30.

[0148] [23rd Feature] As shown in FIG. 31, the construction machine 100 includes a lower traveling body 1, an upper revolving body 2, and a water vapor exhaust port 83 for exhausting water vapor contained in water guided by a drain pipe 30. The upper revolving body 2 includes an outer wall 13 that defines a machine room 14. The outer wall 13 is formed with an air intake port 16 for drawing air outside the machine room 14 into the inside of the machine room 14. The water vapor exhaust port 83 is provided with a louver 89, which is an example of a guide plate that guides water vapor such that the exhaust direction of the water vapor exhausted from the water vapor exhaust port 83 is a direction away from the air intake port 16 (for example, the opposite direction). In this embodiment, the water vapor exhausted from the water vapor exhaust port 83 is guided by the louver 89 in a direction away from the air intake port 16, so that the exhausted water vapor is prevented from entering the machine room 14 again through the air intake port 16.

[0149] 31, the air intake 16 is formed on the right side surface of the outer wall 13, and the direction in which water vapor is discharged from the water vapor exhaust port 83 is, for example, diagonally rearward to the left. The water vapor exhaust port 83 is formed in the wastewater receiver 80. The wastewater receiver 80 has a receiver drain port (not shown) for draining water (liquid water) in the wastewater receiver 80.

[0150] [24th feature] As shown in Figs. 32 to 34, the construction machine 100 includes a lower traveling body 1, an upper revolving body 2, and a water vapor exhaust port 99 for exhausting water vapor contained in water guided by a drain pipe 30. The upper revolving body 2 includes an outer wall 13 that defines a machine room 14. The outer wall 13 is formed with an air intake port 16 for drawing air outside the machine room 14 into the inside of the machine room 14. The water vapor exhaust port 99 and the air intake port 16 are formed at a position where the machine room 14 is interposed between them. In the embodiment shown in each of Figs. 32 to 34, the water vapor exhaust port 99 and the air intake port 16 are formed at a position where the machine room 14 is interposed between them, so that the water vapor exhausted from the water vapor exhaust port 99 is prevented from entering the machine room 14 again through the air intake port 16.

[0151] In the specific example shown in Fig. 32, the air intake 16 is formed on the right side of the exterior wall 13, and the water vapor exhaust port 99 is formed in a duct 98 arranged to the left of the machine room 14. In the specific example shown in Fig. 33, the air intake 16 is formed on the front side of the exterior wall 13, and the water vapor exhaust port 99 is formed in a duct 98 arranged behind the machine room 14. In the specific example shown in Fig. 34, the air intake 16 is formed in an upper part of the front side of the exterior wall 13, and the water vapor exhaust port 99 is formed in a duct 98 arranged behind and below the machine room 14.

[0152] [Other variations] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and includes, for example, the following modified examples.

[0153] (A) Each of the construction machines 100 shown in Figs. 1 to 22 has the first to sixth features, but it is sufficient to have at least the first feature among these features, and it is not necessary to have at least one of the second to sixth features. Each of the construction machines 100 according to the first to sixth modifications shown in Figs. 6 to 24 has the seventh to tenth features, but it is sufficient to have at least the seventh feature among these features, and it is not necessary to have at least one of the eighth to tenth features. Each of the construction machines 100 according to the first to fifth modifications shown in Figs. 6 to 23 has the eleventh feature, but it is not necessary to have the eleventh feature. The construction machine 100 according to the third modification shown in Figs. 16 to 21 has the twelfth and thirteenth features, but it is sufficient to have at least the twelfth feature, and it is not necessary to have the thirteenth feature. The construction machine 100 according to the fifth modification shown in Fig. 23 may have only one of the fifteenth and sixteenth features.

[0154] (B) Regarding drainage pipes In the above embodiment, the drain pipe 30 is inserted through the opening 24 formed in the machine frame 20, the pipe drain outlet 32 ​​is located below the opening 24, and the water in the drain pipe 30 is discharged from the pipe drain outlet 32 ​​below the machine frame 20 (outside the construction machine 100), but the drain pipe 30 may be inserted through an opening (not shown) formed in the outer wall 13, the pipe drain outlet 32 ​​is located outside the outer wall 13, and the water in the drain pipe 30 may be discharged from the pipe drain outlet 32 ​​to the outside of the outer wall 13 (outside the construction machine 100). In this case, the opening may be formed on the side of the outer wall 13 (right side, left side, front side, or rear side).

[0155] (C) Pipe drain outlet In the above embodiment, the pipe drain outlet 32 ​​is located below the device drain outlet 43, but may be located at the same height as the device drain outlet 43. In the above embodiment, the pipe drain outlet 32 ​​is formed at the lower end of the downward portion 30B of the drain pipe 30, but it does not necessarily have to be formed at the lower end of the drain pipe 30. The drain pipe 30 may have only one pipe drain outlet or may have multiple pipe drain outlets. The multiple pipe drain outlets may be formed at intervals in the longitudinal direction of the drain pipe 30, for example.

[0156] (D) Fuel Cell Devices In the embodiment described above, the fuel cell device 42 is supported by the vehicle frame 20 by being disposed on the vehicle frame 20, but it may be supported, for example, by the outer wall 13 that is supported by the vehicle frame 20. In this case, the fuel cell device 42 may be supported by the outer wall 13 via an unillustrated device support member that is fixed to the outer wall 13.

[0157] (E) Regarding the drainage receiver The drainage receiver 80 may be a container having a bottom wall 80B and a side wall 80C, but no top wall (a container with an open top). In this case, the drainage receiver 80 has a storage function, a scattering prevention function, and a protection function. The drainage receiver 80 may also be a simple plate-like member consisting of, for example, a bottom wall. In this case, the drainage receiver 80 is positioned so as to cover the pipe drain outlet 32 ​​of the drain pipe 30 from below, thereby providing at least one of a scattering prevention function and a protection function.

[0158] (F) Swivel joint The problem to be solved by the swivel joint in this disclosure is to reduce the frequency of occurrence of defects such as stains and corrosion caused by water discharged from a fuel cell device splashing on structures such as crawler travelling devices. This swivel joint has a guide path for receiving water guided by a drain pipe connected to the device drain outlet of the fuel cell device and guiding the water downward. In this swivel joint, the water guided by the drain pipe is guided downward through the guide path of the swivel joint arranged on the pivot shaft, thereby reducing the frequency of occurrence of defects such as stains and corrosion caused by water splashing on structures such as crawler travelling devices. [Explanation of symbols]

[0159] 20: Aircraft frame 20E: Outer edge of the aircraft frame 21: Frame body 22: Erected body 23: Standing board (an example of a structural member) 24: Opening of the aircraft frame 26: Cross beam (an example of a structural member) 27: Plate-shaped member (an example of a non-structural member) 30: Drain pipe 30A: Upstream side horizontal section 30B: Downward part 30C: Downstream side horizontal section 30D: Upstream part 30E: 1st downstream part 30F: 2nd downstream part 31: Pipe inlet 32: Pipe drain 33: Water vapor exhaust port 34: Water drain hole 43: Equipment drain 80: Drainage receiver 82: Receiver drain port 83: Water vapor exhaust port 84: Storage section 85: Receiver inlet 90: Controller 91: Water level sensor 95: Duct 100:Construction machinery

Claims

1. a fuel cell device having an apparatus drain; a drain pipe connected to the device drain outlet, A construction machine, wherein the drain pipe is disposed at a position equal to or lower than the height of the equipment drain outlet.

2. 2. The construction machine of claim 1, wherein the drain pipe has a pipe outlet, the pipe outlet being located below the equipment outlet.

3. The construction machine according to claim 2 , wherein the pipe drain outlet is formed at a lowermost portion of the drain pipe.

4. a fuselage frame positioned below the fuel cell device; 3. The construction machine according to claim 2, wherein the drain pipe extends toward an opening formed in the machine frame, and the pipe drain outlet is disposed at the opening or below the opening.

5. the airframe includes structural members and non-structural members; The construction machine according to claim 4 , wherein the opening is formed in the non-structural member or between the structural member and the non-structural member.

6. The construction machine according to claim 5 , wherein the drain pipe has a downward portion that extends downward at a position that avoids the structural member.

7. The construction machine according to claim 2 , further comprising a drain receiver for receiving water guided by the drain pipe.

8. 8. The construction machine according to claim 7, wherein the drainage receiver has a storage portion capable of storing water, and a receiver drain outlet capable of discharging the water stored in the storage portion.

9. 9. The construction machine according to claim 8, wherein the drainage receiver further has a water vapor outlet for discharging water vapor.

10. The construction machine according to claim 9 , wherein the receiver drain outlet is formed in a lower portion of the wastewater receiver, and the water vapor exhaust outlet is formed in a side portion of the wastewater receiver.

11. a fuselage frame positioned below the fuel cell device; The construction machine according to any one of claims 7 to 10, wherein the drainage receiver is disposed under the machine frame and configured to receive water discharged from the pipe drain outlet.

12. a fuselage frame positioned below the fuel cell device; The drainage receiver is disposed under the airframe, The drain pipe includes a downstream lateral portion that extends laterally between the aircraft frame and a bottom surface of the drain receiver, The construction machine according to any one of claims 7 to 10, wherein the pipe drain outlet is formed at a tip end of the downstream side lateral portion.

13. The construction machine according to claim 12, wherein the drain pipe has a drain hole in a portion of the lower surface of the downstream lateral portion upstream of the pipe drain outlet.

14. The construction machine according to claim 9, further comprising a duct into which the water vapor discharged from the water vapor exhaust port flows.

15. A water level sensor for detecting a water level in the drainage receiver; and a controller, The construction machine according to any one of claims 7 to 10, wherein the controller performs control to notify information related to the water level to people involved in the work based on the detection result input from the water level sensor.

16. A water level sensor for detecting a water level in the drainage receiver; and a controller, A construction machine according to any one of claims 7 to 10, wherein the controller controls the timing of discharging water stored in the drainage receiver from the drainage receiver based on the detection results input from the water level sensor.

17. a fuselage frame positioned below the fuel cell device; the drain pipe includes an upstream portion extending from the device outlet to the drain receiver and a downstream portion extending from the drain receiver to the pipe outlet; The construction machine according to any one of claims 7 to 10, wherein the drainage receiver is disposed above the machine frame and configured to receive water guided by the upstream portion.

18. A lower running body; an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body about a vertically extending rotating shaft; A swivel joint disposed on the pivot shaft, 2. The construction machine according to claim 1, wherein the swivel joint has a guideway for receiving water guided by the drain pipe and guiding the water downward.

19. A lower running body; an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body about a vertically extending rotating shaft; A swivel joint disposed on the pivot shaft, The construction machine according to claim 1 , wherein the drain pipe has a portion that extends downward along an outer surface of the swivel joint, and a pipe drain outlet is formed in the portion.

20. a lower running body having a car body; an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body about a vertically extending rotating shaft; 2. The construction machine of claim 1, further comprising: a lower drain receiver supported by the carbody for receiving water guided by the drain pipe.

21. The construction machine according to claim 20, wherein the lower drainage receiver has a lower storage portion that is a storage portion capable of storing water, and a lower receiver drain outlet that is capable of discharging the water stored in the lower storage portion.

22. A lower running body; an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body about a vertically extending rotating shaft; a water vapor outlet for discharging water vapor contained in the water guided by the drain pipe; The upper rotating body includes an outer wall defining a machine room, An exhaust port for discharging air from inside the machine room is formed in the outer wall, The construction machine according to claim 1 , wherein the water vapor exhaust port is configured to exhaust water vapor in a direction parallel to a discharge direction of air exhausted from the exhaust port.

23. A lower running body; an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body about a vertically extending rotating shaft; a water vapor outlet for discharging water vapor contained in the water guided by the drain pipe; The upper rotating body includes an outer wall defining a machine room, an air intake port is formed in the outer wall for drawing air outside the machine room into the machine room; 2. The construction machine according to claim 1, wherein a guide plate is disposed at the water vapor exhaust port to guide the water vapor such that the exhaust direction of the water vapor from the water vapor exhaust port is away from the air intake port.

24. A lower running body; an upper rotating body supported by the lower traveling body so as to be rotatable relative to the lower traveling body about a vertically extending rotating shaft; a water vapor outlet for discharging water vapor contained in the water guided by the drain pipe; The upper rotating body includes an outer wall defining a machine room, an air intake port is formed in the outer wall for drawing air outside the machine room into the machine room; 2. The construction machine according to claim 1, wherein the water vapor exhaust port and the air intake port are formed at positions such that the machine room is interposed between them.

Images