Electrically powered construction machine

Abstract

The vehicle body of the electric construction machinery equipped with an electric motor (14) and a battery (15) includes: a hydraulic equipment compartment (13) located at the front of the vehicle body, housing hydraulic equipment including a hydraulic pump (11); an electrical equipment compartment (19) located at the rear of the vehicle body, housing electrical equipment including the electric motor (14) and the battery (15); a partition (12) separating the hydraulic equipment compartment (13) and the electrical equipment compartment (19); and an outer casing (25) covering the electrical equipment compartment (19), the outer casing (25) having an air intake (32) and an exhaust (34) for allowing cooling air to circulate within the electrical equipment compartment (19). The battery (15) is cooled by a water-cooled cooling device located between the partition (12) and the air intake (32) in the longitudinal direction of the vehicle body.

Description

Technical Field

[0001] This invention relates to electric construction machinery such as hydraulic excavators, which have an electric motor as a power source. Background Technology

[0002] Hydraulic excavators, representing engineering machinery, consist of a self-propelled lower traveling body, a swivel upper rotating body mounted on the lower traveling body, and a working device located at the front of the upper rotating body. In recent years, as a measure to mitigate global warming and air pollution, electric hydraulic excavators powered by electric motors have been put into practical use. These electric hydraulic excavators are equipped with both electrical and hydraulic systems.

[0003] The electrical equipment on an electric hydraulic excavator includes an electric motor that drives the hydraulic pump and an inverter that controls the operation of the electric motor. The hydraulic equipment includes a hydraulic pump that supplies working oil to the hydraulic actuators. Therefore, an electric hydraulic excavator has heat exchangers for cooling the electrical equipment, heat exchangers for cooling the working oil supplied to the hydraulic equipment, and fans for generating cooling air to supply each heat exchanger; these heat exchangers are usually arranged adjacent to each other. Furthermore, the upper limit of the refrigerant temperature required to cool the electrical equipment is typically lower than the upper limit of the refrigerant temperature required to cool the hydraulic equipment. Therefore, to efficiently cool the electrical equipment, it is necessary to prevent the heat from the high-temperature working oil from affecting the heat exchangers used to cool the electrical equipment.

[0004] In response, an electric hydraulic excavator was proposed that separates the hydraulic equipment chamber containing the hydraulic equipment from the electrical equipment chamber containing the electrical equipment through a partition, thereby improving the cooling efficiency of the electrical equipment (see Patent Document 1). Existing technical documents Patent documents

[0005] Patent Document 1: International Publication No. 2021 / 192165 Summary of the Invention

[0006] However, construction machinery may operate for extended periods in environments with high external temperatures. In such cases, even if the hydraulic equipment compartment and electrical equipment compartment are separated by partitions, the ambient temperature inside the electrical equipment compartment will still be high, resulting in a smaller temperature difference between the heat exchanger and the cooling air. This poses a risk that the cooling water supplied to the electrical equipment may not be adequately cooled by the heat exchanger.

[0007] The present invention was made in view of the above-mentioned prior art problems, and the object of the present invention is to provide an electric engineering machine capable of efficiently cooling electrical equipment.

[0008] The electric construction machinery of the present invention comprises: a vehicle body equipped with an electric motor; a hydraulic pump driven by the electric motor to supply working oil to a hydraulic actuator disposed on the vehicle body; and a storage battery storing the electricity supplied to the electric motor. The electric construction machinery is characterized by having a water-cooled battery cooling device for cooling the storage battery. The vehicle body is provided with: a hydraulic equipment compartment disposed at the front side of the vehicle body in the longitudinal direction, housing hydraulic equipment including the hydraulic pump; an electrical equipment compartment disposed at the rear side of the vehicle body in the longitudinal direction, housing electrical equipment including the electric motor and the storage battery; a partition separating the hydraulic equipment compartment from the electrical equipment compartment; and an outer casing covering the electrical equipment compartment, the outer casing having an intake port and an exhaust port for allowing external air to circulate as cooling air within the electrical equipment compartment. The storage battery is disposed between the partition and the intake port in the longitudinal direction of the vehicle body.

[0009] According to the present invention, the effects of heat received from the hydraulic equipment chamber can be suppressed, and electrical equipment can be cooled efficiently. Attached Figure Description

[0010] Figure 1 This is a left-side view of an electric hydraulic excavator according to an embodiment of the present invention. Figure 2 This is a top-down view of the hydraulic and electrical equipment mounted on the upper rotating body, with the compartments and covers removed. Figure 3 This is a rear view of the electrical equipment mounted on the upper rotating body, viewed from the rear with the compartments and covers removed. Figure 4 This is a rear view of the upper rotating body with the compartments removed, viewed from the rear. Figure 5 From Figure 4 A cross-sectional view of the inlet blades viewed from the V-V direction. Figure 6 From Figure 4 The right-side view of the upper rotating body with the compartments removed, viewed from the VI-VI direction. Figure 7 It is a top view showing the flow of cooling air in the electrical equipment room. Figure 8 This is a diagram showing the configuration of a cooling system for electrical equipment. Figure 9 This is a diagram showing the structure of an air conditioning heating unit. Figure 10 This is a diagram showing the configuration of the storage battery and air conditioning cooling system. Detailed Implementation

[0011] The following uses an electric hydraulic excavator as an example, while also referring to... Figures 1 to 10 The embodiments of the present invention will be described in detail below. Furthermore, in these embodiments, the travel direction of the electric hydraulic excavator will be defined as the forward-backward direction, and the direction orthogonal to this travel direction will be defined as the left-right direction.

[0012] exist Figure 1 In this electric hydraulic excavator 1, there is a self-propelled tracked lower traveling body 2 and an upper rotating body 3 mounted on the lower traveling body 2. The body of the electric hydraulic excavator 1 is composed of the lower traveling body 2 and the upper rotating body 3. A swing-type working device 4 is provided on the front side of the upper rotating body 3, and the working device 4 is used for digging operations such as excavating soil and gravel.

[0013] The upper gyrocopter 3 is gyratoryly mounted on the lower traveling body 2 and performs gyratory movements on the lower traveling body 2. The upper gyrocopter 3 consists of a gyrocopter frame 5, a counterweight 6, a compartment 7, a hydraulic pump 11, an electric motor 14, a battery 15, and an outer casing 25.

[0014] The rotary frame 5 forms the base of the upper rotary body 3. The rotary frame 5 is mounted on the lower traveling body 2 via a rotary device, and the working device 4 is installed on the front side of the rotary frame 5.

[0015] like Figure 2 as well as Figure 7 As shown, the rotary frame 5 comprises a base plate 5A, a left longitudinal plate 5B, a right longitudinal plate 5C, a left side frame 5D, and a right side frame 5E. The base plate 5A is positioned at the center in the left-right direction and extends in the front-back direction. The left longitudinal plate 5B and the right longitudinal plate 5C are erected on the base plate 5A, facing each other in the left-right direction and extending in the front-back direction. The left side frame 5D is fixed to the top of a left extension beam extending to the left from the base plate 5A and the left longitudinal plate 5B, and extends in the front-back direction. The right side frame 5E is fixed to the top of a right extension beam extending to the right from the base plate 5A and the right longitudinal plate 5C, and extends in the front-back direction.

[0016] The counterweight 6 is installed at the rear end of the rotary frame 5. The counterweight 6 achieves weight balance with the working device 4 located at the front of the rotary frame 5. The outer circumference of the counterweight 6 is an arc shape with the central part protruding rearward in the left-right direction. Thus, when the upper rotary body 3 rotates, the outer circumference of the counterweight 6 is contained within the specified rotation radius.

[0017] Cabin 7 is mounted on the front left side of the rotary frame 5. Cabin 7 comprises a floor component 7A as its base and a cabin-type box 7B disposed on the floor component 7A, forming the operator's cab. The front side of the floor component 7A is mounted to the rotary frame 5, for example, via a tilting support member (not shown), and can tilt in the longitudinal direction about a rotation axis extending along the width direction (left-right direction) of the rotary frame 5. The rear side of the floor component 7A is mounted to the left front side of the counterweight 6 via a vibration damper (not shown). Inside cabin 7, a driver's seat 7C is provided for the operator to sit in. Around the driver's seat 7C are arranged a travel lever and pedals, and a work control lever (both not shown) for operating the electric hydraulic excavator 1. By operating the travel lever and pedals, and the work control lever, the operator can perform driving actions based on the lower traveling body 2, rotating actions of the upper rotary body 3, and digging operations based on the work device 4.

[0018] The control valve 8 is located on the lower side of the compartment 7 and mounted on the front left side of the swing frame 5. The control valve 8 is connected via hydraulic lines to the hydraulic power source, consisting of the working oil tank 9 and the hydraulic pump 11, and to the various hydraulic actuators mounted on the electric hydraulic excavator 1. The control valve 8 selectively supplies working oil (hydraulic oil) injected from the hydraulic pump 11 to the various hydraulic actuators according to the operation of the travel lever and pedal operating device and the work lever operating device located in the compartment 7.

[0019] The working oil tank 9 is mounted on the front right side of the swing frame 5. The working oil tank 9 stores the working oil supplied to the various hydraulic actuators mounted on the electric hydraulic excavator 1. An oil cooler 10 is disposed adjacent to the right side of the working oil tank 9. The oil cooler 10 cools the working oil returning to the working oil tank 9 from the various hydraulic actuators via control valves 8. An oil cooler fan 10A, consisting of an electric fan, is disposed between the oil cooler 10 and the right front cover 27 (described later). The oil cooler 10 cools the working oil returning to the working oil tank 9 using the cooling air generated by the oil cooler fan 10A.

[0020] The hydraulic pump 11 is located adjacent to the right side frame 5E on the rear side of the working oil tank 9 and the oil cooler 10. The hydraulic pump 11 is driven by an electric motor 14, which pressurizes the working oil stored in the working oil tank 9 and sprays it as hydraulic oil to various hydraulic actuators mounted on the electric hydraulic excavator 1.

[0021] The partition member 12 is disposed in the middle of the rotary frame 5 in the longitudinal direction. When erected vertically from the bottom plate 5A of the rotary frame 5, the partition member 12 extends in the left-right direction between the left side frame 5D and the right side frame 5E. The partition member 12 has a flat left partition 12A disposed between the left side frame 5D and the left longitudinal plate 5B, a flat middle partition 12B disposed between the left longitudinal plate 5B and the right longitudinal plate 5C, and a flat right partition 12C disposed between the right longitudinal plate 5C and the right side frame 5E. The left partition 12A and the middle partition 12B extend from the bottom plate 5A of the rotary frame 5 to the floor member 7A of the compartment 7. The right partition 12C is disposed behind the hydraulic pump 11 and extends from the bottom plate 5A to the upper surface of the right front cover 27 (described later).

[0022] The hydraulic equipment chamber 13 is located in front of the partition component 12 and is formed on the slewing frame 5. The space enclosed by the slewing frame 5, the partition component 12, the outer casing 25, etc. constitutes the hydraulic equipment chamber 13. The hydraulic equipment chamber 13 houses hydraulic equipment including control valves 8, working oil tanks 9, oil coolers 10, hydraulic pumps 11, etc.

[0023] The electric motor 14 is located on the right end of the right partition 12C and is positioned behind the partition member 12. The electric motor 14 constitutes the power source of the electric hydraulic excavator 1, and operates by means of power supplied from the battery 15, thereby driving the hydraulic pump 11.

[0024] The battery 15 is adjacent to the front side of the counterweight 6 and disposed at the rear end of the swing frame 5. The battery 15 has multiple battery modules (not shown), for example, made of lithium-ion batteries, and supplies power to electrical equipment such as the electric motor 14. The battery 15 is formed as a block of cubes extending in the left-right direction by housing multiple battery modules in a housing. Specifically, the battery 15 has an upper surface 15A, a front surface 15B, a rear surface 15C, a left side surface 15D, and a right side surface 15E. The front surface 15B, rear surface 15C, left side surface 15D, and right side surface 15E form a peripheral wall surrounding the upper surface 15A. Here, the electric hydraulic excavator 1 is equipped with a battery and air conditioning cooling device 46, which will be described later. When the electric hydraulic excavator 1 is working, the battery 15 is cooled by a water-cooled battery cooling device to maintain a temperature range of, for example, 20°C to 40°C.

[0025] Inverter 16 is located on the right side of the upper surface 15A of battery 15. Inverter 16 controls the drive voltage supplied from battery 15 to electric motor 14, thereby controlling the operation of electric motor 14.

[0026] Charger 17 is adjacent to the left side of inverter 16 and disposed on the upper surface 15A of battery 15. Charger 17 is electrically connected to power supply port 18 disposed on the rear side (rear surface 15C side) of battery 15. An external power source (not shown) is connected to power supply port 18, thereby supplying power from the external power source to charger 17. Charger 17 supplies the power supplied from the external power source to inverter 16 and charges battery 15 with the remaining power.

[0027] The electrical equipment compartment 19 is located behind the partition member 12 and is formed on the rotary frame 5. The space enclosed by the rotary frame 5, the counterweight 6, the partition member 12, the outer casing 25, etc., constitutes the electrical equipment compartment 19. The electrical equipment compartment 19 houses electrical equipment including an electric motor 14, an inverter 16, a charger 17, etc., as well as a storage battery 15.

[0028] The radiator 20 is located adjacent to the right side of the battery 15 and within the electrical equipment compartment 19. The radiator 20 forms part of the electrical equipment cooling device 36 (described later), cooling the cooling water supplied to electrical equipment such as the inverter 16 and charger 17. The radiator 20, the right side 15E of the battery 15, and the right rear door 30 and right side cover 31 (described later) are positioned opposite each other in the left-right direction. A radiator fan 21, consisting of an electric fan, is positioned between the right rear door 30, the right side cover 31, and the radiator 20. An exhaust port 34 (described later) is provided in the right rear door 30, opposite the radiator fan 21. By rotating the radiator fan 21, cooling air is generated within the electrical equipment compartment 19. This cooling air passes through the radiator 20 and is exhausted to the outside through the exhaust port 34, thereby cooling the cooling water supplied to the electrical equipment.

[0029] The condenser 22 is located in front of the radiator 20 and is disposed within the electrical equipment compartment 19. The compressor 23 is adjacent to the rear side of the left partition 12A and is disposed within the electrical equipment compartment 19. The condenser 22 and the compressor 23 constitute part of the battery and air conditioning cooling device 46. The condenser 22 cools the refrigerant gas compressed by the compressor 23 and converts it into liquid refrigerant by generating cooling air in the electrical equipment compartment 19. The condenser 22 and the right side cover 31 are positioned opposite each other with a fixed distance in the left-right direction. A condenser fan 22A, which is an electric fan, is disposed between the condenser 22 and the right side cover 31. A second exhaust port 35, described later, is provided in the right side cover 31 opposite to the condenser fan 22A. Cooling air is generated in the electrical equipment compartment 19 by the rotation of the condenser fan 22A. When the cooling air passes through the condenser 22 and is discharged to the outside through the second exhaust port 35, heat exchange occurs between the cooling air and the refrigerant gas supplied to the condenser 22.

[0030] Here, if we focus on the positional relationship between the radiator 20 and the condenser 22, then as follows Figure 2 As shown, the condenser 22 is disposed between the partition member 12 and the radiator 20 in the longitudinal direction. In other words, the radiator 20 is disposed behind the slewing frame 5 such that the condenser 22 is sandwiched between it and the partition member 12 in the longitudinal direction of the upper slewing body 3. As a result, the radiator 20, which cools the cooling water supplied to electrical equipment such as the electric motor 14, inverter 16, and charger 17, can be separated as much as possible from the hydraulic equipment chamber 13, which becomes hot during the operation of the electric hydraulic excavator 1.

[0031] In this case, it is known that the greater the temperature difference between the refrigerant and the ambient temperature, the higher the cooling efficiency of the heat exchanger. Typically, the refrigerant gas supplied to the condenser 22 is compressed by the compressor 23, resulting in a temperature much higher than the cooling water supplied to the radiator 20. By positioning the condenser 22 near the hydraulic equipment chamber 13 compared to the radiator 20, the cooling air supplied to the condenser 22 is heated by heat from the hydraulic equipment chamber 13. However, since the temperature difference between the refrigerant gas supplied to the condenser 22 and the cooling air is sufficiently large compared to the temperature difference between the cooling water supplied to the radiator 20 and the cooling air, the refrigerant cooling efficiency achieved based on the condenser 22 can be well maintained.

[0032] The second partition 24 is located between the radiator 20 and the condenser 22 and is disposed within the electrical equipment compartment 19. The second partition 24 extends in a left-right direction between the right side 15E of the battery 15 and the right side cover 31, separating the radiator 20 and the condenser 22. Thus, the radiator 20 and the condenser 22 are separated by the second partition 24 extending from the right side 15E of the battery 15. This prevents cooling air flowing into the electrical equipment compartment 19 from the intake port 32 from flowing forward along the right side 15E of the battery 15 (towards the condenser 22).

[0033] The outer casing 25 is mounted on the gyrocar frame 5, and together with the gyrocar frame 5, counterweight 6, compartment 7, and partition components 12, forms the hydraulic equipment compartment 13 and the electrical equipment compartment 19. The hydraulic equipment compartment 13 and the electrical equipment compartment 19 are covered by the outer casing 25. Figure 1 , Figure 4 as well as Figure 6 As shown, the outer casing 25 comprises a left front cover 26, a right front cover 27, a left rear cover 28, a rear cover 29, a right rear door 30, and a right side cover 31.

[0034] The hydraulic equipment room 13 is formed as a space enclosed by the compartment 7, the partition 12, the left front cover 26, and the right front cover 27. The left front cover 26 is located between the left side frame 5D and the compartment 7, extending in the longitudinal direction. The left front cover 26 covers the control valve 8 and other components located in the hydraulic equipment room 13 from the left side. The right front cover 27 is located on the right side of the compartment 7, rising upwards from the front of the right side frame 5E. The right front cover 27 covers the working oil tank 9, the oil cooler 10, the hydraulic pump 11, and other components from above and the right side.

[0035] An opening 27A is formed in the right front cover 27, opposite the oil cooler fan 10A. When the oil cooler fan 10A of the oil cooler 10 rotates, external air (cooling air) flows into the hydraulic equipment chamber 13 through the opening (not shown) formed on the lower side of the rotary frame 5, and is discharged to the outside through the opening 27A. As the cooling air passes through the oil cooler 10, the heat of the working oil is dissipated into the cooling air, thereby cooling the working oil returning to the working oil tank 9.

[0036] The electrical equipment room 19 is formed as a space enclosed by the counterweight 6, the compartment 7, the partition 12, the left rear cover 28, the rear cover 29, the right rear door 30, and the right side cover 31. The left rear cover 28 is located at the left rear of the compartment 7, rising upwards from the rear of the left side frame 5D. The left rear cover 28 covers the battery 15 from the left side and above. The rear cover 29 rises upwards from the upper surface 6A of the counterweight 6, extending along the upper surface 6A in the left-right direction. The upper end of the rear cover 29 bends forward, and together with the counterweight 6, the rear cover 29 covers the battery 15 from the rear and above.

[0037] A power supply opening 29A is formed in the center of the rear cover 29 in the left-right direction. The power supply opening 29A is located in the rear cover 29 at a position corresponding to the power supply port 18, and is closable by a power supply door 29B. It is configured such that when using an external power source, the power supply door 29B is opened, thereby allowing a connecting cable (not shown) extending from the external power source to connect to the power supply port 18 through the power supply opening 29A. An air intake 32, described later, is formed on the left side of the rear cover 29.

[0038] The right rear door 30 is located at the right rear of compartment 7, rising upwards from the rear of the right side frame 5E. The right rear door 30 can be opened and closed from the rear, right side, and above, covering the battery 15, radiator 20, etc. An exhaust vent 34, described later, is formed in the right rear door 30.

[0039] The right side cover 31 is positioned between the right rear door 30 and the right front cover 27, rising upwards from the middle of the right side frame 5E in the front-rear direction. The right side cover 31 is positioned between the partition member 12 and the second partition member 24, covering the electric motor 14, condenser 22, etc., from the right side and above. A second exhaust port 35, described later, is formed on the right side cover 31.

[0040] An air intake 32 is formed on the rear cover 29. The air intake 32 is located to the left of the power supply opening 29A and is positioned on the lower left side of the rear cover 29. Figure 3 as well as Figure 4 As shown, the air intake 32 is formed as a quadrilateral opening. Cooling air (outside air) passes through the air intake 32 and flows into the electrical equipment room 19 through the rotation of the radiator fan 21 and the condenser fan 22A.

[0041] Here, a battery 15 is disposed between the partition 12 separating the hydraulic equipment chamber 13 and the air intake 32. In other words, the battery 15 is disposed between the partition 12 and the air intake 32 in the front-rear direction of the upper rotating body 3. As a result, the battery 15 prevents the cooling air flowing into the electrical equipment chamber 19 through the air intake 32 from being exposed to the high temperature generated by the hydraulic equipment chamber 13 formed on the front side of the partition 12. Moreover, when the electric hydraulic excavator 1 is working, the battery 15 is maintained at a specified temperature range (e.g., 20°C to 40°C) by a water-cooled battery cooling device of the battery and air conditioning cooling device 46. Therefore, the cooling air that passes through the air intake 32 and flows into the electrical equipment chamber 19 is supplied to the radiator 20 after being cooled by the battery 15, thereby improving the cooling efficiency of the radiator 20.

[0042] Additionally, if we are concerned about the positional relationship between the air intake 32 and the battery 15, then as follows Figure 3 As shown by the double-dotted line, the air intake 32 is positioned below the upper surface 15A of the battery 15. This allows most of the outside air flowing into the electrical equipment compartment 19 from the air intake 32 to act as cooling air, guiding it along the rear surface 15C of the battery 15 towards the exhaust port 34. Furthermore, even if rainwater or other substances are mixed in the cooling air flowing into the electrical equipment compartment 19, it can prevent moisture from adhering to the inverter 16, charger 17, etc., which are mounted on the upper surface 15A of the battery 15.

[0043] like Figure 5 As shown, the air intake 32 is provided with blades 33 as air guide components. The blades 33 have multiple plates 33A that are inclined to the right (exhaust port 34 side) relative to the front-to-back direction. As a result, the cooling air flowing into the electrical equipment room 19 from the air intake 32 is guided by the blades 33 to the exhaust port 34 side.

[0044] An exhaust vent 34 is formed in the right rear door 30. The exhaust vent 34 consists of two quadrilateral openings located at the same height as the radiator fan 21 in the right rear door 30. When the radiator fan 21 rotates, cooling air flows into the electrical equipment compartment 19 from the air intake 32. Most of this cooling air passes through the exhaust vent 34 and is discharged to the outside. This cooling air passes through the radiator 20, thereby cooling the electrical equipment such as the electric motor 14, inverter 16, and charger 17 by the electrical equipment cooling device 36.

[0045] Here, if we focus on the positional relationship between the intake port 32 and the exhaust port 34, then as follows Figure 7 As shown by the double-dotted line, the intake port 32 and the exhaust port 34 are positioned to sandwich a portion of the battery 15 (specifically, the rear surface 15C and right side surface 15E of the battery 15) in the left-right direction of the upper rotating body 3. Thus, cooling air flowing into the electrical equipment compartment 19 from the intake port 32 can be guided along the rear surface 15C and right side surface 15E of the battery 15 to the exhaust port 34. The battery 15 is cooled to a temperature range of, for example, 20°C to 40°C by the battery and air conditioning cooling device 46. Therefore, the cooling air flowing along the rear surface 15C and right side surface 15E of the battery 15, after being cooled by the battery 15, passes through the radiator 20 and is then discharged from the exhaust port 34 to the outside of the electrical equipment compartment 19. In this way, the temperature of the refrigerant supplied to the radiator 20 can be reduced by utilizing the water-cooled battery 15.

[0046] Furthermore, since the exhaust port 34 is formed on the right rear door 30, the distance between it and the air intake 32 formed on the rear cover 29 can be ensured to be large. As a result, even if the cooling air heated by heat exchange with the radiator 20 is discharged to the outside of the electrical equipment room 19 from the exhaust port 34, the heated cooling air can be prevented from flowing back into the electrical equipment room 19 through the air intake 32.

[0047] The second exhaust port 35 is formed on the right side cover 31. The second exhaust port 35 consists of two quadrilateral openings located at the same height as the condenser fan 22A in the right side cover 31. When the radiator fan 21 rotates, cooling air flows into the electrical equipment compartment 19 from the intake port 32, and a portion of this cooling air passes through the second exhaust port 35 and is discharged to the outside. As the cooling air passes through the condenser 22, the heat of the refrigerant gas supplied to the condenser 22 is dissipated into the cooling air, thereby cooling the battery 15 by the battery and air conditioning cooling device 46.

[0048] Thus, in the right rear door 30, an exhaust port 34 is formed at a position corresponding to the radiator fan 21, and in the right side cover 31, a second exhaust port 35 is formed at a position corresponding to the condenser fan 22A. Therefore, as... Figure 7As shown, within the electrical equipment room 19, a first cooling air path is formed, flowing from the air intake 32 across the rear surface 15C side of the battery 15 and from the radiator 20 through to the exhaust port 34. Figure 7 (Arrow F1 in the image), and the second cooling air path that flows from the intake port 32 through the front surface 15B side of the battery 15 and from the condenser 22 through the second exhaust port 35. Figure 7 (See arrow F2 in the diagram). The cooling air flowing in the first cooling air path F1 is cooled by the rear surface 15C and right side surface 15E of the battery 15, while the cooling air flowing in the second cooling air path F2 is cooled by the left side surface 15D and front surface 15B of the battery 15. In this way, the cooling air flowing in the first cooling air path F1 and the cooling air flowing in the second cooling air path F2 flow along different surfaces of the battery 15, thereby being efficiently cooled respectively.

[0049] like Figures 8 to 10 As shown, the electric hydraulic excavator 1 is equipped with an electrical equipment cooling device 36, an air conditioning heating device 41, a battery, and an air conditioning cooling device 46.

[0050] The electrical equipment cooling device 36 cools the electrical equipment such as the electric motor 14, inverter 16, and charger 17 housed in the electrical equipment compartment 19. Figure 8 As shown, the electrical equipment cooling device 36 includes a radiator pipe 37 for circulating cooling water relative to the radiator 20, a motor cooling pipe 38 and an inverter cooling pipe 39 connected in parallel to the radiator pipe 37. The motor cooling pipe 38 is connected to the water jacket (not shown) of the electric motor 14, and cooling water is circulated through it by a pump 38A. The inverter cooling pipe 39 is connected to the water jacket (not shown) of the inverter 16 and the charger 17, and cooling water is circulated through it by a pump 39A.

[0051] Cooling water that has cooled and raised the temperature of the electric motor 14, and cooling water that has cooled and raised the temperature of the inverter 16 and charger 17, circulate within the radiator pipes 37 after being cooled by the radiator 20. In this way, the electrical equipment cooling device 36 maintains the cooling water cooled by the radiator 20 at a temperature of, for example, around 60°C. Furthermore, an expansion tank 40 is connected to the radiator pipes 37, and cooling water is processed between the radiator pipes 37 and the expansion tank 40 according to the pressure changes within the radiator pipes 37 caused by temperature changes in the cooling water. This allows for the replenishment of insufficient cooling water and the deaeration of the cooling water.

[0052] The air conditioning heating unit 41 provides heating for the air conditioning unit (not shown) in cabin 7. For example... Figure 9As shown, the air conditioning heating device 41 includes: a heating element 42 disposed within the air conditioning unit; an electric heater 43 for heating cooling water; a heating pipe 44 connecting the heating element 42 and the electric heater 43; and a pump 44A for circulating cooling water within the heating pipe 44. The cooling water flowing within the heating pipe 44, heated by the electric heater 43, is supplied to the heating element 42, and the heating element 42 exchanges heat with the air within the compartment 7, thereby heating the compartment 7. An expansion tank 45 is connected to the heating pipe 44. Based on the temperature change of the cooling water circulating within the heating pipe 44 by the pump 44A, cooling water is processed between the heating pipe 44 and the expansion tank 45, thereby performing cooling water replenishment, cooling water degassing, etc.

[0053] like Figure 10 As shown, the battery and air conditioning cooling system 46 includes a water-cooled cooling (temperature regulation) device for the battery 15 and a cooling device for the air conditioning system inside the compartment 7. Furthermore, Figure 10 The thick solid lines represent the flow of cooling water, and the thick dashed lines represent the flow of refrigerant gas. The cooling system of the battery 15 includes a battery line 47 connected to the battery 15 and supplying cooling water, a pump 47A, an electric heater 48, and a battery cooler 49. The pump 47A circulates cooling water within the battery line 47. The electric heater 48, connected to the battery line 47, heats the cooling water. The battery cooler 49, connected to the battery line 47, cools the cooling water. The cooling water flowing within the battery line 47 is heated by the electric heater 48 or cooled by the battery cooler 49, thereby cooling the battery 15 while maintaining a specified temperature range (e.g., 20°C to 40°C) through temperature adjustment.

[0054] The temperature of the battery 15 is constantly monitored using a temperature sensor (not shown). The battery and air conditioning cooling system 46 selects either a mode where the cooling water is heated by the electric heater 48 or a mode where the cooling water is cooled by the battery cooler 49, based on the temperature of the battery 15 detected by the temperature sensor. Furthermore, an expansion tank 50 is connected to the battery piping 47. Based on the temperature changes of the cooling water circulating in the battery piping 47, cooling water is processed between the battery piping 47 and the expansion tank 50, thereby performing cooling water replenishment and deaeration.

[0055] The air conditioning unit's cooling system includes a refrigerant gas line 51 for refrigerant gas flow, a condenser 22, a compressor 23, a receiver-dryer 52, expansion valves 53 and 54, an evaporator 55, and a battery cooler 49. The battery cooler 49 is shared with the cooling system of the aforementioned battery 15. The refrigerant gas flowing in the refrigerant gas line 51 is supplied to the condenser 22 in a compressed state by the compressor 23, and undergoes heat exchange with the cooling air generated in the electrical equipment room 19 by the condenser fan 22A, thereby becoming a low-temperature, high-pressure liquid refrigerant. The liquid refrigerant cooled by the condenser 22 is dehydrated by the receiver-dryer 52, and then depressurized to an easily evaporable state by the expansion valves 53 and 54. The liquid refrigerant depressurized by one of the expansion valves 53 vaporizes (evaporates) through the evaporator 55, and the air in the compartment 7 is cooled by this vaporization cooling.

[0056] Additionally, the liquid refrigerant, depressurized by another expansion valve 54, vaporizes within the battery cooler 49, which constitutes the cooling device of the battery 15. The cooling water circulating in the battery piping 47 is cooled by the vaporization cooling of the liquid refrigerant within the evaporator 49. Thus, the condenser 22 forms part of the battery and air conditioning cooling device 46, contributing to both the cooling function of the air conditioning unit and the cooling function of the battery 15.

[0057] The electric hydraulic excavator 1 of this embodiment has the configuration described above. When using the electric hydraulic excavator 1 for excavation or other operations, the operator sits in the cabin 7 and operates the electric motor 14, thereby driving the hydraulic pump 11. In this state, the operator moves the electric hydraulic excavator 1 to the work site by operating the travel lever and pedals (not shown) inside the cabin 7. In addition, by operating the working control lever (not shown), the operator can perform excavation operations such as digging soil and gravel by rotating the upper rotating body 3 and using the working device 4.

[0058] When the electric hydraulic excavator 1 is operating, the oil cooler fan 10A, the radiator fan 21, and the condenser fan 22A are driven to rotate. When the oil cooler fan 10A rotates, external air (cooling air) flows into the hydraulic equipment chamber 13 through an opening (not shown) formed on the lower side of the slewing frame 5. After passing through the oil cooler 10, this cooling air passes through the opening 27A of the right front cover 27 and is discharged to the outside of the hydraulic equipment chamber 13. The oil cooler 10 dissipates heat from the return oil (working oil) returning from the hydraulic actuator to the working oil tank 9 into the cooling air passing through the oil cooler 10. This cools the working oil returning to the working oil tank 9. The hydraulic equipment chamber 13 is separated from the electrical equipment chamber 19 by the partition member 12, thus preventing heat transfer to the electrical equipment chamber 19 even when heat is generated in the hydraulic equipment chamber 13 during the operation of the electric hydraulic excavator 1.

[0059] On the other hand, if the radiator fan 21 and the condenser fan 22A rotate, cooling air flows into the electrical equipment compartment 19 through the air intake 32 formed in the rear cover 29. In this case, a battery 15 is disposed between the partition member 12 that separates the electrical equipment compartment 19 and the hydraulic equipment compartment 13 and the air intake 32. Furthermore, the air intake 32 is disposed below the upper surface 15A of the battery 15. Thus, as... Figure 7 As shown, within the electrical equipment room 19, a first cooling air path F1 flowing from the rear surface 15C side of the battery 15 and a second cooling air path F2 flowing from the front surface 15B side of the battery 15 are formed.

[0060] Cooling air flowing in the first cooling air path F1 is guided from the intake port 32 along the rear surface 15C and right side surface 15E of the battery 15 to the radiator 20. After passing through the radiator 20, it passes through the exhaust port 34 formed in the right rear door 30 and is discharged to the outside of the electrical equipment compartment 19. The radiator 20 dissipates heat from the cooling water heated by the electrical equipment (electric motor 14, inverter 16, charger 17, etc.) cooled by the electrical equipment cooling device 36 to the cooling air flowing through the radiator 20. In this case, the cooling air flowing in the first cooling air path F1 is not heated by the heat generated by the hydraulic equipment compartment 13 because it is separated from the electrical equipment compartment 19 by the battery 15 relative to the partition member 12. As a result, even if, for example, the electric hydraulic excavator 1 operates for a long time in a high-temperature environment, causing the ambient temperature inside the electrical equipment compartment 19 to rise, the cooling water will still be cooled by the radiator 20 of the electrical equipment cooling device 36. Therefore, electrical equipment such as electric motor 14, inverter 16, and charger 17 can be properly cooled by cooling water.

[0061] Cooling air flowing within the second cooling air path F2 is guided from the intake port 32 along the left side 15D and front surface 15B of the battery 15 to the condenser 22. After passing through the condenser 22, it passes through the second exhaust port 35 formed on the right side cover 31 and is discharged to the outside of the electrical equipment compartment 19. The condenser 22 dissipates the heat from the refrigerant gas supplied to the battery cooler 49 of the battery and air conditioning cooling device 46 to the cooling air passing through the condenser 22. In this way, the battery 15 can be cooled to maintain a specified temperature range (e.g., 20°C to 40°C) that is the appropriate operating temperature.

[0062] Therefore, the cooling air flowing within the first cooling air path F1 is cooled by the battery 15 while being guided towards the radiator 20 along the rear surface 15C and right side 15E of the battery 15. As a result, the temperature of the cooling air supplied to the radiator 20 can be reduced using the battery 15, further improving the cooling efficiency of electrical equipment such as the electric motor 14 achieved based on the electrical equipment cooling device 36.

[0063] Thus, in the electric hydraulic excavator 1 of this embodiment, even when the mounting space for equipment such as the upper rotating body 3 is narrow and a large heat exchanger cannot be mounted, the temperature of the cooling air supplied to the radiator 20 can be reduced by using the water-cooled battery 15. As a result, the cooling efficiency of the radiator 20 can be improved, and electrical equipment such as the electric motor 14, inverter 16, and charger 17 can be properly cooled.

[0064] Furthermore, the cooling air flowing within the second cooling air path F2 can be cooled by the battery 15 while being guided towards the condenser 22 along the left side 15D and front surface 15B of the battery 15. As a result, the temperature of the cooling air supplied to the condenser 22 can be reduced using the battery 15, and the cooling efficiency of the battery 15 based on the battery and air conditioning cooling device 46 can also be improved.

[0065] Furthermore, the intake port 32 and exhaust port 34 are positioned such that the rear surface 15C and right side surface 15E of the battery 15 are sandwiched between the upper rotating body 3 in the left-right direction, thus ensuring a large distance between the intake port 32 and the exhaust port 34. As a result, even if the cooling air heated by heat exchange with the radiator 20 is discharged to the outside of the electrical equipment room 19 from the exhaust port 34, it is possible to prevent the heated cooling air from flowing back into the electrical equipment room 19 through the intake port 32, thereby suppressing the temperature rise of the cooling air flowing into the electrical equipment room 19.

[0066] Furthermore, the radiator 20 is positioned at the rear of the rotary frame 5 such that the condenser 22 is sandwiched between the radiator 20 and the partition member 12 in the longitudinal direction of the upper rotary body 3. This allows the radiator 20, which cools the cooling water supplied to electrical equipment such as the electric motor 14, to be as far apart as possible from the hydraulic equipment chamber 13, which becomes hot during the operation of the electric hydraulic excavator 1, thereby improving the cooling efficiency of the electrical equipment implemented based on the radiator 20.

[0067] Furthermore, the intake port 32 is positioned below the upper surface 15A of the battery 15, and the intake port 32 is provided with blades 33 having multiple plates 33A inclined towards the exhaust port 34. This prevents cooling air flowing into the electrical equipment compartment 19 through the intake port 32 from flowing over the upper surface 15A of the battery 15 towards the partition member 12. Additionally, the blades 33 restrict the direction of the cooling air flowing into the electrical equipment compartment 19 from the intake port 32, guiding most of the cooling air along the rear surface 15C of the battery 15 towards the exhaust port 34. As a result, most of the cooling air flowing into the electrical equipment compartment 19 flows along the rear surface 15C and the right side 15E of the battery 15, thereby reducing the temperature of the cooling air and further improving the cooling efficiency of the electrical equipment based on the radiator 20.

[0068] Furthermore, a second partition member 24 extending in the left-right direction between the right side 15E of the battery 15 and the right side cover 31 is disposed between the radiator 20 and the condenser 22. This prevents cooling air flowing into the electrical equipment compartment 19 from flowing towards the condenser 22 along the rear surface 15C and right side 15E of the battery 15. As a result, a large amount of cooling air cooled by the battery 15 can be supplied to the radiator 20, further improving the cooling efficiency of the electrical equipment implemented based on the radiator 20.

[0069] Thus, the electric hydraulic excavator 1 of this embodiment includes: a body equipped with an electric motor 14; a hydraulic pump 11 driven by the electric motor 14 and supplying working oil to a hydraulic actuator provided on the body; and a battery 15 storing the electricity supplied to the electric motor 14, and having a water-cooled battery cooling device for cooling the battery 15. The body is provided with: a hydraulic equipment chamber 13 located on the front side of the body in the longitudinal direction and housing the hydraulic equipment including the hydraulic pump 11; an electrical equipment chamber 19 located on the rear side of the body in the longitudinal direction and housing the electrical equipment including the electric motor 14 and the battery 15; a partition member 12 separating the hydraulic equipment chamber 13 and the electrical equipment chamber 19; and an outer casing 25 covering the electrical equipment chamber 19, the outer casing 25 having an air intake 32 and an exhaust 34 for allowing outside air to circulate as cooling air within the electrical equipment chamber 19, and the battery 15 being disposed between the partition member 12 and the air intake 32 in the longitudinal direction of the body.

[0070] According to this configuration, the air intake 32 can be separated from the partition member 12 by the battery 15. This prevents the cooling air flowing into the electrical equipment compartment 19 from being heated by heat from the hydraulic equipment compartment 13, and allows the water-cooled battery 15 to lower the temperature of the cooling air. As a result, even if, for example, the electric hydraulic excavator 1 operates for extended periods in a high-temperature environment, causing the ambient temperature inside the electrical equipment compartment 19 to rise, the electrical equipment can be efficiently cooled using cooling air.

[0071] In this embodiment, the air intake 32 and the exhaust port 34 are positioned to sandwich a portion of the battery 15 in the left-right direction of the vehicle body. With this configuration, the temperature of the cooling air can be reduced by guiding the cooling air flowing from the air intake 32 into the electrical equipment compartment 19 along the water-cooled battery 15 to the exhaust port 34.

[0072] In this embodiment, the device includes: a radiator fan 21 located within the electrical equipment compartment 19 that discharges air from the electrical equipment compartment 19 to the outside through an exhaust port 34; and a radiator 20 located within the electrical equipment compartment 19 that cools the cooling water supplied to the electrical equipment by the cooling air generated by the radiator fan 21. The battery cooling device includes a condenser 22 for cooling the battery 15, located within the electrical equipment compartment 19 and positioned between the partition member 12 and the radiator 20 in the longitudinal direction of the vehicle body. With this configuration, the radiator 20, which cools the cooling water supplied to the electrical equipment, can be separated as much as possible from the hydraulic equipment compartment 13, which generates heat, thereby improving the cooling efficiency of the electrical equipment implemented based on the radiator 20.

[0073] In this embodiment, the air intake 32 is positioned in the housing 25 (rear cover 29) below the upper surface 15A of the battery 15. This configuration prevents cooling air flowing into the electrical equipment compartment 19 from passing through the air intake 32 from flowing over the upper surface 15A of the battery 15 towards the partition member 12. This allows the battery 15 to be used to lower the temperature of the cooling air flowing into the electrical equipment compartment 19, further improving the cooling efficiency of the electrical equipment based on the radiator 20.

[0074] In one embodiment, a blade 33 is provided at the air intake 32 provided on the outer casing 25 to guide the cooling air that passes through the air intake 32 and flows into the electrical equipment compartment 19 toward the exhaust port 34. According to this configuration, the blade 33 restricts the direction of the cooling air that passes through the air intake 32 and flows into the electrical equipment compartment 19, so that most of the cooling air can be guided along the battery 15 toward the exhaust port 34.

[0075] In this embodiment, the battery cooling device includes a condenser fan 22A, and the outer casing 25 has a second exhaust port 35 that discharges the cooling air generated by the condenser fan 22A to the outside of the electrical equipment compartment 19. Within the electrical equipment compartment 19, a first cooling air path is formed, flowing from the intake port 32 through the rear of the battery 15 and the radiator 20 to the exhaust port 34, and a second cooling air path flows from the intake port 32 through the front of the battery 15 and the condenser 22 to the second exhaust port 35. With this configuration, the cooling air flowing into the electrical equipment compartment 19 from the intake port 32 can be divided into cooling air supplied to the radiator 20 via the first cooling air path and cooling air supplied to the condenser 22 via the second cooling air path. As a result, sufficient cooling air can be supplied to the radiator 20 via the first cooling air path, and sufficient cooling air can be supplied to the condenser 22 via the second cooling air path.

[0076] In this embodiment, the battery 15 is formed as a block having an upper surface 15A and peripheral walls (front surface 15B, rear surface 15C, left side surface 15D, and right side surface 15E) surrounding the upper surface 15A. Cooling air flowing from the intake port 32 into the electrical equipment compartment 19 is guided along the peripheral walls of the battery 15 towards the exhaust port 34. With this configuration, the temperature of the cooling air can be reduced by the battery 15 during the flow of the cooling air into the electrical equipment compartment 19 along the peripheral walls of the battery 15.

[0077] Furthermore, in the embodiments, the battery 15 is exemplified as being formed into a block shape by an upper surface 15A and a peripheral wall surface having a quadrilateral cross-sectional shape, which is formed by a front surface 15B, a rear surface 15C, a left side surface 15D, and a right side surface 15E. However, the present invention is not limited to this, and for example, it may be configured to use a battery formed into a block shape by an upper surface and a peripheral wall surface having a polygonal cross-sectional shape of pentagon or more, or a battery formed into a block shape by an upper surface and a peripheral wall surface having an elliptical cross-sectional shape.

[0078] Furthermore, in this embodiment, an electric hydraulic excavator 1 having a tracked undercarriage 2 is exemplified. However, the present invention is not limited thereto and can be widely applied to other electric construction machinery, such as electric hydraulic excavators having wheeled undercarriages. Explanation of reference numerals in the attached figures

[0079] 2. Lower running body (vehicle body) 3. Upper rotating body (vehicle body) 11 Hydraulic pump 12 Separating components 13 Hydraulic Equipment Room 14 Electric motors 15 Storage batteries 15A upper surface 15B Front Surface (Peripheral Wall) 15C Rear Surface (Peripheral Wall) 15D Left side (peripheral wall) 15E Right side (peripheral wall) 19 Electrical Equipment Room 20 Radiators 21. Heatsink Fan 22 Condenser 22A Condenser Fan 25. Outer casing 32 Intake port 33 Blades (air guide components) 34 Exhaust port 35 Second exhaust port 46. ​​Storage batteries and air conditioning cooling devices.

Claims

1. An electric engineering machine, comprising: The vehicle body is equipped with an electric motor; A hydraulic pump, driven by the electric motor, supplies working oil to a hydraulic actuator located on the vehicle body; and A storage battery that stores the electricity supplied to the electric motor. The electric engineering machinery is characterized by the following features: It has a water-cooled battery cooling device for cooling the battery. The vehicle body is equipped with: A hydraulic equipment room, located on the front side of the vehicle body in the longitudinal direction, houses hydraulic equipment including the hydraulic pump; An electrical equipment compartment, located on the rear side of the vehicle body in the front-rear direction, houses electrical equipment including the electric motor and the battery; A partition separating the hydraulic equipment room from the electrical equipment room; and An outer casing that covers the electrical equipment compartment. The housing has an intake port for allowing outside air to circulate as cooling air within the electrical equipment room, and an exhaust port. The battery is positioned in the longitudinal direction of the vehicle body between the partition and the air intake.

2. The electric engineering machinery according to claim 1, characterized in that, The air intake and the exhaust port are positioned at a location that sandwiches a portion of the battery in the left-right direction of the vehicle body.

3. The electric engineering machinery according to claim 1, characterized in that, have: A fan, located in the electrical equipment room, allows air from the electrical equipment room to be exhausted to the outside through the exhaust port; and A radiator, located in the electrical equipment room, cools the cooling water supplied to the electrical equipment by cooling air generated by the fan. The battery cooling device includes a condenser for cooling the battery. The condenser is located in the electrical equipment room and is positioned between the partition and the radiator in the longitudinal direction of the vehicle body.

4. The electric engineering machinery according to claim 1, characterized in that, The air intake is located in the outer casing at a position lower than the upper surface of the battery.

5. The electric engineering machinery according to claim 4, characterized in that, The air intake provided in the housing is provided with a guide component that guides the cooling air flowing into the electrical equipment room from the air intake toward the exhaust port.

6. The electric engineering machinery according to claim 3, characterized in that, The battery cooling device includes a condenser fan. The outer casing has a second exhaust port that discharges the cooling air generated by the fan of the condenser to the outside of the electrical equipment room. A first cooling air path is formed in the electrical equipment room, flowing from the air intake through the rear of the battery and the radiator to the exhaust port, and a second cooling air path flows from the air intake through the front of the battery and the condenser to the second exhaust port.

7. The electric engineering machinery according to claim 1, characterized in that, The battery is formed as a block having an upper surface and a peripheral wall surrounding the upper surface. Cooling air flowing into the electrical equipment room from the intake port is guided along the peripheral wall of the battery toward the exhaust port.

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