Fuel cell type construction machine

Abstract

To provide a fuel cell type construction machine capable of ensuring the safety of an operator by enabling safe access to a hydrogen tank.SOLUTION: A fuel cell type construction machine (1) comprises: a vehicle body; a hydrogen tank (42) in which hydrogen is stored; a fuel cell (44) that generates electricity using hydrogen supplied from the hydrogen tank (42); a fuel cell chamber (70) in which the hydrogen tank (42) and the fuel cell (44) are stored; a fan unit (52) that is disposed in the fuel cell chamber (70) and generates cooling air and ventilates the inside of the fuel cell chamber (70); and a heat exchanger (50) that exchanges heat between the cooling water that has cooled the fuel cell (44) and the cooling air generated by the fan unit (52).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a fuel cell powered construction machine. [Background technology]

[0002] Patent Document 1 discloses a hydraulic excavator as a fuel cell-powered construction machine. The hydraulic excavator is equipped with an upper main body device (upper rotating body) that houses a hydrogen tank for storing hydrogen and a fuel cell for generating electricity using hydrogen supplied from the hydrogen tank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-180565 A Summary of the Invention [Problem to be solved by the invention]

[0004] Because hydrogen is a flammable gas, sufficient consideration must be given to safety when the operator accesses the hydrogen tank during maintenance. However, in the construction machine of Patent Document 1, no special consideration is given to ensuring the safety of the operator, so the hydrogen tank cannot be accessed safely. Therefore, there is a demand for a fuel cell-powered construction machine that can ensure the safety of the operator.

[0005] The present invention has been made in consideration of such problems, and has an object to provide a fuel cell powered construction machine that can ensure the safety of the operator. [Means for solving the problem]

[0006] In order to achieve the above-mentioned objectives, the fuel cell-powered construction machine of the present invention is characterized by comprising a vehicle body, a hydrogen tank in which hydrogen is stored, a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank, a fuel cell chamber in which the hydrogen tank and fuel cell are stored, a fan device disposed in the fuel cell chamber for generating cooling air and ventilating the inside of the fuel cell chamber, and a heat exchanger for exchanging heat between the cooling water that has cooled the fuel cell chamber and the cooling air generated by the fan device. Effect of the Invention

[0007] Therefore, according to the present invention, it is possible to provide a fuel cell powered construction machine capable of ensuring the safety of the operator. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a hydraulic excavator according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram of an upper rotating body according to a first embodiment of the present invention, viewed from above. FIG. [Diagram 3] FIG. 3 is a schematic diagram of the upper rotating body of FIG. 2 as viewed from the right side. [Figure 4] FIG. 11 is a schematic diagram of an upper rotating body according to a second embodiment of the present invention, as viewed from above. [Diagram 5] FIG. 5 is a schematic diagram of the upper rotating body of FIG. 4 as viewed from the right side. [Figure 6] FIG. 11 is a schematic diagram of an upper rotating body according to a third embodiment of the present invention, as viewed from above. [Figure 7] FIG. 7 is a schematic diagram of the upper rotating body in FIG. 6 as viewed from the right side. [Figure 8] FIG. 11 is a schematic diagram of an upper rotating body according to a fourth embodiment of the present invention, as viewed from above. [Figure 9] FIG. 9 is a schematic diagram of the upper rotating body in FIG. 8 as viewed from the right side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A construction machine according to an embodiment of the present invention will be described below with reference to the drawings. For ease of explanation, the "front", "rear", "left" and "right" are defined based on the traveling direction of a hydraulic excavator 1 as a construction machine, as seen from an operator in a cab 8 of the hydraulic excavator 1, and "up" and "down" are defined based on gravity. That is, the "front" and "rear" arrows shown in each drawing indicate the forward and backward directions of the body of the hydraulic excavator 1, the "left" and "right" arrows indicate the left-right (vehicle width) directions of the body of the hydraulic excavator 1, and the "up" and "down" arrows indicate the up-down directions of the body of the hydraulic excavator 1.

[0010] Fig. 1 shows a side view of a hydraulic excavator 1 according to one embodiment of the present invention. The hydraulic excavator 1 is a fuel cell type construction machine, and includes a lower traveling body 10, an upper rotating body (main body) 20 rotatably attached to the lower traveling body 10, and a front working machine 30 swingably attached to the upper rotating body 20. The lower traveling body 10 includes front wheels 2A, rear wheels 2B, a center frame 12, a center joint 14 (see Fig. 2), etc.

[0011] The lower traveling body 10 is a wheel-type traveling device that travels on front wheels 2A and rear wheels 2B, and enables the hydraulic excavator 1 to travel. The center frame 12 is a support structure that supports the upper rotating body 20 so that it can rotate. The center joint 14 is a rotary joint that is provided on the center frame 12 and positioned at the center of rotation of the upper rotating body 20, and hydraulic oil is circulated between the lower traveling body 10 and the upper rotating body 20 via the center joint 14.

[0012] The front working machine 30 is attached to the upper rotating body 20 and is a machine for performing work such as excavating earth and sand, and is equipped with a boom 32, an arm 34, and a bucket 36. The boom 32 is attached to a frame (not shown) of the upper rotating body 20 so as to be rotatable in the vertical direction (i.e., around the axis in the vehicle width direction), and is driven by a boom cylinder 32a. The arm 34 is attached to the tip of the boom 32 so as to be rotatable in the vertical direction, and is driven by an arm cylinder 34a. The bucket 36 is attached to the tip of the arm 34 so as to be rotatable in the vertical direction, and is driven by a bucket cylinder 36a.

[0013] The upper rotating body 20 includes a rotating frame 22, a cab 24, a counterweight 4, a rotating device 26 (see FIG. 2), and a machine room 6. The rotating frame 22 is a support structure that serves as the base of the upper rotating body 20. The cab 24 is formed on the front and left side of the rotating frame 22, and is provided with a cab 8 in which an operator sits to drive and operate the hydraulic excavator 1. By operating a plurality of operation levers (not shown) provided in the cab 8, various operations such as traveling of the lower traveling body 10, rotation of the upper rotating body 20, and excavation by the front work implement 30 can be performed.

[0014] The counterweight 4 is attached to the rear end of the revolving frame 22 to ensure the weight balance of the hydraulic excavator 1. The revolving device 26 is composed of a motor and a reducer (not shown), and operation of the revolving device 26 causes the upper revolving body 20 to revolve left or right on the undercarriage 10 around the center joint 14 as the center of rotation. The machine room 6 is formed between the cab 24 of the revolving frame 22 and the counterweight 4, and on the right side of the cab 24, and is partitioned into the upper revolving body 20 by the right side cover 6a, the left side cover 6b (see FIG. 2), the upper cover 6c, the lower revolving frame 22, the front cover 6d, and the rear counterweight 4.

[0015] First Embodiment Fig. 2 shows a schematic view of the upper rotating body 20 according to the first embodiment as seen from above, and Fig. 3 shows a schematic view of the upper rotating body 20 as seen from the right side in Fig. 2. In a rear area 40 formed rearward of the driver's cab 8 in the fore-and-aft direction of the vehicle body of the upper rotating body 20, a hydrogen tank 42, a fuel cell 44, a battery 46, an electric motor 48, a heat exchanger 50, a fan unit 52, etc. are arranged.

[0016] More specifically, the hydrogen tank 42 is disposed above the fuel cell 44 and the battery 46, and in Fig. 3, only a portion of the fuel cell 44 is shown as it is hidden by the electric motor 48, and the battery 46 is not shown. Meanwhile, in a front area 60 including the operator's cab 8 in the fore-and-aft direction of the vehicle body of the upper rotating body 20, a hydraulic pump 62, a hydraulic oil tank 64, a hydraulic valve 66, etc. are disposed. In this embodiment, the hydraulic pump 62, the hydraulic oil tank 64, and the hydraulic valve 66 are disposed side by side in the fore-and-aft direction of the vehicle body.

[0017] Hydrogen is stored in the hydrogen tank 42 as a gaseous fuel, and the fuel cell 44 generates electricity using hydrogen supplied from the hydrogen tank 42. The battery 46 stores the electricity generated by the fuel cell 44. The electric motor 48 is powered by the battery 46 and is driven by the electricity generated by the fuel cell 44. The electricity stored in the battery 46 may be used to drive the electric motor 48, as well as various motors provided in the aforementioned turning device 26 and the traveling device of the lower traveling body 10, and may also be used to drive the fuel cell 44.

[0018] The heat exchanger 50 supplies cooling water towards the fuel cell 44 to cool the fuel cell 44, and also exchanges heat between the cooled cooling water and cooling air to cool the water and return it to the fuel cell 44. The fan device 52 blows cooling air towards the heat exchanger 50 to exchange heat between the cooling air and the cooling water. The hydraulic pump 62 is driven by the electric motor 48. The hydraulic oil tank 64 stores the hydraulic oil drawn into the hydraulic pump 62. The hydraulic valve 66 is supplied with the hydraulic oil discharged by the hydraulic pump 62 and constitutes a hydraulic device (not shown).

[0019] The hydraulic oil that has passed through the hydraulic valve 66 is supplied to the boom cylinder 32a, arm cylinder 34a, and bucket cylinder 36a of the front working implement 30, and the boom 32, arm 34, and bucket 36 are each individually driven and controlled by controlling the amount of hydraulic oil supplied by the hydraulic valve 66. Note that the aforementioned slewing device 26 and the traveling device of the lower traveling body 10 may also be driven by hydraulic oil supplied from a hydraulic device including the hydraulic pump 62.

[0020] Here, the upper rotating body 20 is formed with a fuel cell chamber 70 in which the hydrogen tank 42 and the fuel cell 44 are stored. The above-mentioned fan device 52 is disposed in the fuel cell chamber 70, and in addition to the heat exchange function of blowing cooling air to the heat exchanger 50, the fan device 52 also has a ventilation function of ventilating the inside of the fuel cell chamber 70 by drawing in and exhausting air. It is preferable that the ventilation of the fuel cell chamber 70 by the fan device 52 is performed at all times, regardless of whether the hydraulic excavator 1 is started or not. The battery 46 is also stored in the fuel cell chamber 70.

[0021] Furthermore, the fuel cell chamber 70 also houses the heat exchanger 50 and the electric motor 48 described above. That is, the fuel cell chamber 70 is the same region as the rear region 40 of the upper rotating body 20, and the partition wall 72 that separates the rear region 40 from the front region 60 defines the fuel cell chamber 70 in the machinery room 6. Furthermore, the upper rotating body 20 has a high-voltage region 80 in which high-voltage equipment is arranged in the machinery room 6, and a non-high-voltage region 90 in which non-high-voltage equipment is arranged in the machinery room 6, and the partition wall 72 described above also separates the high-voltage region 80 from the non-high-voltage region 90.

[0022] Specifically, the high-voltage area 80 is the same area as the rear area 40 and the fuel cell chamber 70, and the hydrogen tank 42, the fuel cell 44, the battery 46, the electric motor 48, the heat exchanger 50, and the fan unit 52 are arranged therein. On the other hand, the non-high-voltage area 90 is the same area as the front area 60, and the hydraulic pump 62, the hydraulic oil tank 64, and the hydraulic valve 66 are arranged therein, and the operator's cab 8 is formed therein. In other words, the high-voltage area 80 is formed in the rear area 40 (the same area as the fuel cell chamber 70) rearward of the operator's cab 8 in the fore-and-aft direction of the body of the upper rotating body 20, and the non-high-voltage area 90 is formed in the front area 60 including the operator's cab 8 in the fore-and-aft direction of the body of the upper rotating body 20.

[0023] Further, an exhaust port 74 is formed in the rear end portion in the front-rear direction of the vehicle body of the high-voltage area 80 constituting the fuel cell chamber 70, i.e., in the counterweight 4, for discharging the air inside the fuel cell chamber 70 in association with ventilation by the fan unit 52. The exhaust port 74 is disposed, for example, in a position facing the fan unit 52 across the heat exchanger 50 in the front-rear direction of the vehicle body, and is disposed on a diagonal line in the front-rear direction of the vehicle body and the width direction of the vehicle body when viewed from above of the driver's cab 8. Further, as shown in FIG. 2, an intake port 76 is formed in the left side cover 6b partitioning the fuel cell chamber 70, for introducing outside air into the fuel cell chamber 70 in association with ventilation by the fan unit 52.

[0024] In the present embodiment, as a result of prioritizing the layout of the devices mounted on the revolving frame 22, the partition wall 72 is formed in a curved shape in top view with steps from the first wall portion 72a, the second wall portion 72b, and the connecting wall portion 72c. In detail, the first wall portion 72a linearly separates the hydrogen tank 42 and the cab 24 along the width direction of the vehicle body. The second wall portion 72b linearly separates the electric motor 48 and the hydraulic pump 62 along the width direction of the vehicle body at a position shifted rearward from the first wall portion 72a in the front-rear direction of the vehicle body. The connecting wall portion 72c connects the first wall portion 72a and the second wall portion 72b along the front-rear direction of the vehicle body.

[0025] As described above, in the fuel cell powered hydraulic excavator 1 of this embodiment, the fuel cell chamber 70 in which the hydrogen tank 42 and fuel cell 44 are stored is partitioned in the machine room 6, and the fan device 52 that generates cooling air and ventilates the inside of the fuel cell chamber 70, and the heat exchanger 50 that exchanges heat between the cooling water that has cooled the fuel cell 44 and the cooling air generated by the fan device 52 are disposed in the fuel cell chamber 70. As a result, even if hydrogen accumulates in the fuel cell chamber 70 for some reason, the hydrogen is discharged to the outside of the fuel cell chamber 70. Therefore, the hydrogen tank 42 can be safely accessed, ensuring the safety of the operator during maintenance.

[0026] Furthermore, by storing the battery 46 in the fuel cell chamber 70, even if flammable gas or harmful gas resulting from volatilization of battery fluid accumulates in the fuel cell chamber 70 for some reason, the gas is exhausted to the outside of the fuel cell chamber 70 by the fan device 52. Therefore, the battery 46 can be accessed safely, ensuring the safety of the operator during maintenance.

[0027] In addition, the fan device 52 has a ventilation function for ventilating the inside of the fuel cell chamber 70 by drawing in and exhausting air, and a heat exchange function for blowing cooling air to the heat exchanger 50. Here, the hydrogen tank 42, fuel cell 44, battery 46, and electric motor 48 that constitute the fuel cell system of the hydraulic excavator 1 can be replaced with a conventional construction machine engine.

[0028] Therefore, since fuel cell powered construction machines have more on-board equipment than conventional construction machines, the space in the machine room 6 is narrow and the layout of the on-board equipment is easily restricted. By using an existing so-called radiator fan as the ventilation fan device 52 as in this embodiment, the number of on-board equipment of the hydraulic excavator 1 can be reduced and the degree of freedom in the layout of the on-board equipment in the machine room 6 can be increased.

[0029] The upper rotating body 20 is divided by a partition wall 72 into a high-voltage area 80 in which the hydrogen tank 42, the fuel cell 44, the battery 46, the electric motor 48, the heat exchanger 50, and the fan unit 52 are arranged and which constitutes the fuel cell chamber 70, and a non-high-voltage area 90 in which the hydraulic pump 62, the hydraulic oil tank 64, and the hydraulic valve 66 are arranged and the operator's cab 8 is formed. The partition wall 72 separates the high-voltage area 80 from the non-high-voltage area 90 and defines the fuel cell chamber 70. As a result, in addition to defining the fuel cell chamber 70, the high-voltage area 80 in which high-voltage equipment is arranged can be divided from the non-high-voltage area 90 in which non-high-voltage equipment is arranged and the operator's cab 8 is formed. Therefore, the operator who rides in the operator's cab 8 can be isolated from the high-voltage equipment, and the safety of the operator can be improved.

[0030] The high voltage area 80 is formed in the rear area 40 behind the cab 8 in the longitudinal direction of the body of the upper rotating body 20, and the non-high voltage area 90 is formed in the front area 60 including the cab 8 in the longitudinal direction of the body of the upper rotating body 20. An exhaust port 74 is formed in the rear end of the high voltage area 80 constituting the fuel cell chamber 70 in the longitudinal direction of the body, that is, in the counterweight 4 in this embodiment, for exhausting the air inside the fuel cell chamber 70 in association with ventilation by the fan device 52. As a result, hydrogen or other flammable gases or toxic gases remaining in the fuel cell chamber 70 are exhausted at a position remote from the cab 8. This further improves the safety of the operator riding in the cab 8.

[0031] Moreover, the exhaust port 74 is disposed on a diagonal line in a plan view of the cab 8 in the front-rear direction and width direction of the vehicle body. This allows hydrogen or other flammable or toxic gases exhausted from the fuel cell chamber 70 to be exhausted at a position farthest from the cab 8. This further improves the safety of the operator in the cab 8.

[0032] <Second embodiment> Fig. 4 shows a schematic diagram of the upper rotating body 20 according to the second embodiment as viewed from above, and Fig. 5 shows a schematic diagram of the upper rotating body 20 as viewed from the right side in Fig. 4. In the following description of the new embodiment, features different from the embodiments already described will be mainly described, and features similar to those of the embodiments already described will be denoted by the same reference numerals in the drawings and description thereof will be omitted.

[0033] In the second embodiment, unlike the first embodiment, the partition wall 72 is formed linearly along the width direction of the vehicle body. More specifically, the first wall portion 72a that divides the hydrogen tank 42 and the cab 24 linearly along the width direction of the vehicle body in the first embodiment is extended to a position that divides the electric motor 48 and the hydraulic pump 62 along the width direction of the vehicle body. This forms a partition wall 72 without a step, excluding the connecting wall portion 72c, and prevents the internal air of the fuel cell chamber 70 from stagnating in the space around the corners that form the step of the partition wall 72. Therefore, the ventilation efficiency of the fuel cell chamber 70 by the fan device 52 is improved, and the safety of the operator can be further improved.

[0034] <Third embodiment> Fig. 6 is a schematic diagram of the upper rotating body 20 according to the third embodiment as viewed from above, and Fig. 7 is a schematic diagram of the upper rotating body 20 as viewed from the right side in Fig. 6. In the third embodiment, similar to the second embodiment, the partition wall 72 is formed linearly along the width direction of the vehicle body.

[0035] More specifically, the second wall portion 72b, which in the first embodiment separates the electric motor 48 and the hydraulic pump 62 in a straight line along the width direction of the vehicle body, is extended in the width direction of the vehicle body to a position separating the hydrogen tank 42 and the cab 24. As a result, as in the second embodiment, stagnation of air inside the fuel cell chamber 70 due to a step is suppressed, and the ventilation efficiency of the fuel cell chamber 70 by the fan device 52 is improved, thereby further improving the safety of the operator.

[0036] Furthermore, in the third embodiment, by forming the partition wall 72 in a straight line with reference to the second wall portion 72b, the machine room 6 on the right side cover 6a side of the non-high voltage area 90 (front area 60) does not protrude forward as in the second embodiment when the partition wall 72 is formed in a straight line with reference to the first wall portion 72a. This ensures the operator's visibility from the cab 8 when the upper rotating body 20 rotates to the right, as in the first embodiment. Therefore, the operator's safety can be improved without impairing the operator's visibility when operating the hydraulic excavator 1.

[0037] <Fourth embodiment> Fig. 8 shows a schematic view of the upper rotating body 20 according to the fourth embodiment as viewed from above, and Fig. 9 shows a schematic view of the upper rotating body as viewed from the right side in Fig. 8. In the fourth embodiment, similarly to the second and third embodiments, the partition wall 72 is formed linearly along the width direction of the vehicle body.

[0038] More specifically, as in the second embodiment, the first wall 72a that separates the hydrogen tank 42 and the cab 24 in a straight line along the width of the vehicle body is extended to a position that separates the electric motor 48 and the hydraulic pump 62 along the width of the vehicle body. This prevents internal air from accumulating in the fuel cell chamber 70, as in the second and third embodiments, improving the efficiency of ventilation of the fuel cell chamber 70 by the fan device 52 and further improving the safety of the operator.

[0039] Furthermore, in the fourth embodiment, the hydraulic oil tank 64 is disposed above the hydraulic pump 62. This allows the width in the front-rear direction of the vehicle body between the front cover 6d of the machine room 6 and the partition wall 72 to be reduced. Therefore, the machine room 6 on the right side cover 6a side of the non-high voltage area 90 (front area 60) does not protrude forward as in the second embodiment. This allows the operator's visibility from the cab 8 when the upper rotating body 20 rotates to the right to be secured as in the first and third embodiments. This allows the operator's safety to be improved without impairing the operator's visibility when operating the hydraulic excavator 1.

[0040] Furthermore, in the fourth embodiment, since the partition wall 72 is formed linearly with reference to the first wall portion 72a, the high voltage region 80 (rear region 40), i.e., the fuel cell chamber 70, does not protrude rearward as in the third embodiment, in which the partition wall 72 is formed linearly with reference to the second wall portion 72b. As a result, the counterweight 4 does not protrude rearward, and the turning radius of the upper rotating body 20 about the center joint 14 as the turning center can be kept small as in the first and second embodiments. Therefore, the operator's safety can be improved without impairing the operability of the operator when operating the hydraulic excavator 1.

[0041] Furthermore, by arranging the hydraulic oil tank 64 above the hydraulic pump 62, the hydraulic oil in the hydraulic oil tank 64 can be drawn in by the hydraulic pump 62 more smoothly than in a case where the hydraulic oil tank 64 is arranged horizontally next to the hydraulic pump 62. This makes it possible to effectively suppress pressure loss of the hydraulic oil and the occurrence of cavitation in the hydraulic system. Therefore, it is possible to improve the operating efficiency of the hydraulic system, and therefore the front working implement 30, while improving the safety of the operator.

[0042] The above is the end of the description of the embodiments of the present invention, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the second to fourth embodiments, the partition wall 72 is formed linearly along the width direction of the vehicle body, but the present invention is not limited to this, and may be formed linearly in the width direction of the vehicle body. In other words, the partition wall 72 may be inclined with respect to the width direction of the vehicle body as long as it is linear. Even in this case, the internal air in the fuel cell chamber 70 is prevented from stagnation, and therefore the ventilation efficiency of the fuel cell chamber 70 by the fan device 52 is improved.

[0043] In the fourth embodiment, the hydraulic oil tank 64 is disposed above the hydraulic pump 62, but as long as it is possible to prevent the counterweight 4 from protruding rearward, the combination of mounted equipment disposed above and below is not limited to this, and various patterns are possible. In addition, the position where the exhaust port 74 is formed may be any position as long as it is the rear end portion of the vehicle body, and is not necessarily limited to being formed in the counterweight 4.

[0044] Furthermore, in each embodiment, the hydraulic excavator 1 has been described as an example of construction machinery, but the present invention is not limited to the hydraulic excavator 1 and can be applied to various types of fuel cell type construction machinery. [Explanation of symbols]

[0045] 1. Hydraulic excavator (construction machinery) 4 Counterweight (rear end) 8. Cab 40 Posterior area 42 Hydrogen Tank 44 Fuel Cell 46 Battery 48 Electric Motor 50 heat exchanger 52 Fan unit 60 Anterior area 62 Hydraulic Pump 64 Hydraulic Oil Tank 66 Hydraulic Valve 70 Fuel cell room 72 Bulkhead 74 Exhaust port 80 High Voltage Area 90 Non-high voltage area

Claims

1. The car body and A hydrogen tank in which hydrogen is stored; a fuel cell that generates electricity using the hydrogen supplied from the hydrogen tank; a fuel cell chamber in which the hydrogen tank and the fuel cell are housed; a fan device disposed in the fuel cell chamber for generating cooling air and ventilating the inside of the fuel cell chamber; a heat exchanger that exchanges heat between the cooling water that has cooled the fuel cell and the cooling water generated by the fan device; A fuel cell powered construction machine comprising:

2. 2. A fuel cell-powered construction machine according to claim 1, wherein a battery for storing electricity generated by the fuel cell is housed in the fuel cell chamber.

3. an electric motor driven by electricity generated by the fuel cell; a hydraulic pump driven by the electric motor; a hydraulic oil tank in which hydraulic oil to be sucked by the hydraulic pump is stored; a hydraulic valve to which the hydraulic oil discharged by the hydraulic pump is supplied; A cab in which an operator sits; a high-voltage area in which the hydrogen tank, the fuel cell, the battery, the electric motor, the heat exchanger, and the fan device are arranged and which constitutes the fuel cell chamber; a non-high voltage area in which the hydraulic pump, the hydraulic oil tank, and the hydraulic valve are arranged, and in which the operator's cab is arranged; a partition wall that separates the high voltage area from the non-high voltage area and defines the fuel cell chamber; 3. The fuel cell powered construction machine according to claim 2, further comprising:

4. The high voltage area is formed in a rear area rearward of the driver's cab in a front-rear direction of the vehicle body, The non-high voltage area is formed in a front area including the driver's cab in a front-rear direction of the vehicle body, 4. The fuel cell-powered construction machine according to claim 3, characterized in that an exhaust port is formed at a rear end in the fore-and-aft direction of the vehicle body of the high-voltage area constituting the fuel cell chamber, for discharging air inside the fuel cell chamber in conjunction with ventilation by the fan device.

5. 5. The fuel cell powered construction machine according to claim 4, wherein the exhaust port is disposed on a diagonal line in a plan view of the operator's cab in the front-rear direction of the vehicle body and in the width direction of the vehicle body.

6. 4. The fuel cell powered construction machine according to claim 3, wherein the partition wall is linear in the width direction of the vehicle body.

7. 4. The fuel cell powered construction machine according to claim 3, wherein the hydraulic oil tank is disposed above the hydraulic pump.

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