JP5189039B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine.

  2. Description of the Related Art Conventionally, construction machines are known in which a hydraulic pump is driven by driving an electric motor, a swivel base is turned by hydraulic oil discharged from the hydraulic pump, and a boom and an arm are operated. For example, in the construction machine described in Patent Document 1, a battery is used as a power supply source to the electric motor, and the battery is disposed inside the vehicle body in consideration of the heat generated by the hydraulic pump and the electric motor. .

JP 2007-262856 A

  However, in the battery described in Patent Document 1, although the heat generation of other devices is considered, the cooling of the cell when the cell itself, which is a component of the battery, generates heat is not considered. Therefore, in the continuous operation of the construction machine, the cells generate heat and become high temperature, so that a desired power supply performance cannot be obtained, and it may be difficult to stably continue the operation.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a construction machine capable of efficiently cooling a cell.

  A construction machine according to the present invention includes an engine, a power generation unit that generates power by driving the engine, a power storage unit that stores power generated by the power generation unit, and an electric drive unit that is driven by power from the power storage unit. In the construction machine, the power storage means is installed in a revolving body that is swiveled by driving of the electric drive means, and includes a case that accommodates a plurality of cells. The case is opened toward the swiveling direction of the revolving body and cools outside air. It has an opening for flowing in the case as wind.

  According to such a construction machine, the case containing a plurality of cells is installed in the revolving structure, and the case is provided with an opening that is open toward the revolving direction of the revolving structure. When the swirl moves, the wind generated by the swirling flows as cooling air in the case through the opening of the case, and the cell can be efficiently cooled.

  Here, if the case has a fan that discharges cooling air from the inside of the case to the outside, the cooling air from the fan is added to the air generated by the swirling of the revolving body. Can be cooled.

  Further, when the case has a fan that supplies outside air as cooling air into the case, the intake side fan is added to the exhaust side fan, so that the cell can be cooled more efficiently.

  Further, if the fan has a configuration in which the wind direction is switched according to the turning direction of the revolving structure, when the revolving structure revolves in one direction, the fan wind direction is the same direction as the wind generated by the one-way turning of the revolving structure. The fan can be driven so that when the revolving body turns in the opposite direction to one direction, the wind direction of the fan is switched to be the same direction as the wind generated by the turning in the opposite direction of the revolving body. The fan can be driven. Therefore, the cell can be cooled more efficiently by the fan whose wind direction can be switched regardless of which direction the swirling body turns.

  Here, since a push-up load may be applied to the case from below during work, the fan is preferably provided on the side wall or the upper wall of the case. In correspondence with this configuration, an opening on the exhaust side of the case is also provided on the side wall or the upper wall of the case.

  The temperature information detecting means includes temperature information detecting means for detecting information related to the temperature of the cell, and control means for controlling the driving of the fan based on the information detected by the temperature information detecting means. Since the driving of the fan is controlled by the control means based on the information on the temperature of the cell detected in step 1, the fan can efficiently cool the cell while saving energy for driving the fan.

  In addition, if the distance between the side wall constituting the case and the cell located near the side wall is wider than the parallel distance between the plurality of cells, the case of the case that is most affected by sunlight and the heat of the engine. The cell is arranged away from the side wall, the thermal influence on the cell is reduced, the entire cell can be cooled uniformly, and the cell can be cooled more efficiently.

  In addition, when the plurality of cells are arranged in a staggered manner with respect to the flow direction of the cooling air, the cells are arranged in a line with respect to the flow direction of the cooling air, so that the cooling air flows to the most upstream cell. As compared with the configuration in which the cooling efficiency for the downstream cells is worse, the cooling air comes into contact with each cell, the entire cell can be cooled uniformly, and the cells can be cooled more efficiently.

  In addition to the cooling air flow path that flows in the case, the case has a bypass flow path for bypassing and sending the cooling air to cells arranged on the exhaust side. Compared with the configuration in which the cooling air hits the other cell and the cooling efficiency for the exhaust side cell deteriorates, the cooling air is also sent to the cell arranged on the exhaust side through the bypass flow path. It can cool uniformly and can cool a cell more efficiently.

  Also, an upper module in which a plurality of cells are arranged and a lower module in which a plurality of cells are arranged below the upper module are provided, and outside air is guided from outside as cooling air to the upper module and the lower module. In the flow path, the flow path is divided up and down so as to evenly distribute the cooling air toward the upper module and the lower module, and has a partition wall that is inclined with respect to the flow direction of the cooling air. By the partition wall, the cooling air is evenly distributed to the upper module and the lower module, so that the entire cell can be cooled uniformly and the cell can be cooled more efficiently.

  Thus, according to this invention, the construction machine which can cool a cell efficiently can be provided.

It is a perspective view showing the appearance of the construction machine concerning a 1st embodiment of the present invention. It is a block diagram which shows internal structures, such as an electric system of the construction machine shown in FIG. 1, and a hydraulic system. It is a circuit diagram which shows the internal structure of the electrical storage means in FIG. It is a perspective view which shows the house part of the turning body in FIG. It is sectional drawing which shows the state which installed the capacitor box of the electrical storage means in the house part. It is a perspective view which shows a capacitor box. It is a partially broken perspective view which shows the state which removed the side surface outer frame and the upper surface outer frame from the capacitor box shown in FIG. It is the partially broken perspective view which looked at FIG. 7 from the back side. It is a perspective view which shows the submodule in FIGS. 6-8. It is a plane block diagram which shows the inside of the capacitor box of the construction machine which concerns on 2nd Embodiment. It is a plane block diagram which shows the inside of the capacitor box of the construction machine which concerns on 3rd Embodiment. It is a plane block diagram which shows the inside of the capacitor box of the construction machine which concerns on 4th Embodiment. It is a XIII-XIII arrow line view of FIG. It is a block diagram showing internal composition, such as an electric system of a construction machine concerning another embodiment, and a hydraulic system.

  Hereinafter, preferred embodiments of a construction machine according to the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing an appearance of a construction machine according to an embodiment of the present invention. The construction machine of this embodiment is a so-called hybrid type construction machine, and shows a lifting magnet vehicle as an example.

  As shown in FIG. 1, the lifting magnet vehicle 1 includes a traveling mechanism 2 including an endless track, and a revolving body 4 that is rotatably mounted on an upper portion of the traveling mechanism 2 via a revolving mechanism 3. The revolving body 4 is attached with a boom 5, an arm 6 linked to the tip of the boom 5, and a lifting magnet 7 linked to the tip of the arm 6. The lifting magnet 7 is a facility for attracting and capturing a suspended load G such as a steel material by a magnetic force. The boom 5, arm 6 and lifting magnet 7 are hydraulically driven by a boom cylinder 8, an arm cylinder 9 and a bucket cylinder 10, respectively.

  Further, the revolving body 4 includes a driver's cab 4a for accommodating an operator who operates the position of the lifting magnet 7, the excitation operation and the release operation, and an engine 11 which is a power source for generating hydraulic pressure (see FIG. 2). ) And the like. The engine 11 is composed of, for example, a diesel engine.

  FIG. 2 is a block diagram showing an internal configuration of the construction machine shown in FIG. 1, such as an electrical system and a hydraulic system, and the configuration is referred to as a so-called parallel system. In FIG. 2, the mechanical power transmission system is indicated by a double line, the hydraulic system is indicated by a thick solid line, the steering system is indicated by a broken line, and the electrical system is indicated by a thin solid line. FIG. 3 is a diagram showing the internal configuration of the power storage means 120 in FIG.

  As shown in FIG. 2, the lifting magnet vehicle 1 includes a motor generator (power generation means) 12 and a transmission 13, and the rotation shafts of the engine 11 and the motor generator 12 are both connected to the input shaft of the transmission 13. Are connected to each other. When the load on the engine 11 is large, the motor generator 12 assists the driving force of the engine 11 by driving the engine 11 as a work element, and the driving force of the motor generator 12 is used as the output shaft of the transmission 13. And then transmitted to the main pump 14. On the other hand, when the load on the engine 11 is small, the driving force of the engine 11 is transmitted to the motor generator 12 via the transmission 13 so that the motor generator 12 generates power.

  The motor generator 12 is configured by, for example, an IPM (Interior Permanent Magnetic) motor in which a magnet is embedded in the rotor. Switching between driving and power generation of the motor generator 12 is performed according to the load of the engine 11 and the like by the controller 30 that controls driving of the electric system in the lifting magnet vehicle 1.

  A main pump 14 and a pilot pump 15 are connected to the output shaft of the transmission 13, and a control valve 17 is connected to the main pump 14 via a high-pressure hydraulic line 16. The control valve 17 is a device that controls the hydraulic system in the lifting magnet vehicle 1. In addition to the left and right hydraulic motors 2a and 2b for driving the traveling mechanism 2 shown in FIG. 1, a boom cylinder 8, an arm cylinder 9 and a bucket cylinder 10 are connected to the control valve 17 via a high pressure hydraulic line. The control valve 17 controls the hydraulic pressure supplied to them according to the operation input of the driver.

  The output terminal of the inverter circuit 18 </ b> A is connected to the electrical terminal of the motor generator 12. The power storage means 120 is connected to the input terminal of the inverter circuit 18A. As shown in FIG. 3, the power storage means 120 includes a DC bus 110 that is a DC bus, a step-up / down converter 100, and a capacitor 19. That is, the input terminal of the inverter circuit 18 </ b> A is connected to the input terminal of the buck-boost converter 100 via the DC bus 110. A capacitor 19 is connected to the output terminal of the buck-boost converter 100. Here, the capacitor 19 has a large number of cells. A battery may be used instead of the capacitor.

  Returning to FIG. 2, the inverter circuit 18 </ b> A controls the operation of the motor generator 12 based on a command from the controller 30. That is, when the inverter circuit 18A operates the motor generator 12 in electric (assist) operation, the necessary power is supplied from the capacitor 19 and the step-up / down converter 100 to the motor generator 12 via the DC bus 110. Further, when the motor generator 12 is caused to perform a power generation operation, the electric power generated by the motor generator 12 is charged into the capacitor 19 via the DC bus 110 and the step-up / down converter 100. The switching control between the step-up / step-down operation of the step-up / down converter 100 is performed by the controller 30 based on the DC bus voltage value, the capacitor voltage value, and the capacitor current value. As a result, the DC bus 110 can be maintained in a state of being stored at a predetermined constant voltage value.

  Further, the lifting magnet 7 shown in FIG. 1 is connected to the DC bus 110 of the power storage means 120 via an inverter circuit 20B. The lifting magnet 7 includes an electromagnet that generates a magnetic force for magnetically attracting a metal object, and power is supplied from the DC bus 110 via the inverter circuit 20B. The inverter circuit 20 </ b> B supplies the requested power to the lifting magnet 7 from the DC bus 110 when the electromagnet is turned on based on a command from the controller 30. Further, when the electromagnet is turned off, the regenerated electric power is supplied to the DC bus 110.

  Further, an inverter circuit 20A is connected to the power storage means 120. One end of the inverter circuit 20A is connected to a turning electric motor (AC motor; electric drive means) 21 as a working electric motor, and the other end of the inverter circuit 20A is connected to the DC bus 110 of the power storage means 120. The turning electric motor 21 is a power source of the turning mechanism 3 shown in FIG. A resolver 22, a mechanical brake 23, and a turning speed reducer 24 are connected to the rotating shaft 21 </ b> A of the turning electric motor 21.

  When the turning electric motor 21 performs a power running operation, the rotational force of the rotational driving force of the turning electric motor 21 is amplified by the turning speed reducer 24, and the turning body 4 is subjected to acceleration / deceleration control to perform rotational motion. Further, due to the inertial rotation of the swing body 4, the rotation speed is increased by the swing speed reducer 24 and transmitted to the swing electric motor 21 to generate regenerative power. The turning electric motor 21 is AC driven by the inverter circuit 20A by a PWM (Pulse Width Modulation) control signal. As the turning electric motor 21, for example, a magnet-embedded IPM motor is suitable.

  The resolver 22 is a sensor that detects the rotation position and rotation angle of the rotation shaft 21A of the turning electric motor 21, and mechanically connects to the turning electric motor 21 to detect the rotation angle and rotation direction of the rotation shaft 21A. When the resolver 22 detects the rotation angle of the rotation shaft 21A, the rotation angle and the rotation direction of the turning mechanism 3 are derived. The mechanical brake 23 is a braking device that generates a mechanical braking force, and mechanically stops the rotating shaft 21 </ b> A of the turning electric motor 21 according to a command from the controller 30. The turning speed reducer 24 is a speed reducer that reduces the rotational speed of the rotating shaft 21 </ b> A of the turning electric motor 21 and mechanically transmits it to the turning mechanism 3.

  In addition, since the motor generator 12, the turning motor 21, and the lifting magnet 7 are connected to the DC bus 110 via the inverter circuits 18A, 20A, and 20B, the power generated by the motor generator 12 is lifted. In some cases, the magnet 7 or the turning electric motor 21 may be directly supplied, and in some cases, the electric power regenerated by the lifting magnet 7 may be supplied to the motor generator 12 or the turning electric motor 21. In some cases, the electric power regenerated in step 1 is supplied to the motor generator 12 or the lifting magnet 7.

  An operation device 26 is connected to the pilot pump 15 via a pilot line 25. The operating device 26 is an operating device for operating the turning electric motor 21, the traveling mechanism 2, the boom 5, the arm 6, and the lifting magnet 7, and is operated by an operator. A control valve 17 is connected to the operating device 26 via a hydraulic line 27, and a pressure sensor 29 is connected via a hydraulic line 28. The operating device 26 converts the hydraulic pressure (primary hydraulic pressure) supplied through the pilot line 25 into a hydraulic pressure (secondary hydraulic pressure) corresponding to the operation amount of the operator and outputs the hydraulic pressure. The secondary hydraulic pressure output from the operating device 26 is supplied to the control valve 17 through the hydraulic line 27 and detected by the pressure sensor 29.

  When an operation for turning the turning mechanism 3 is input to the operating device 26, the pressure sensor 29 detects this operation amount as a change in the oil pressure in the hydraulic line 28. The pressure sensor 29 outputs an electrical signal indicating the hydraulic pressure in the hydraulic line 28. This electric signal is input to the controller 30 and used for driving control of the turning electric motor 21.

  The controller 30 constitutes a control circuit in the present embodiment. The controller 30 is configured by an arithmetic processing unit including a CPU and an internal memory, and is realized by the CPU executing a drive control program stored in the internal memory. The power source of the controller 30 is a battery (for example, a 24V on-vehicle battery) different from the capacitor 19. The controller 30 converts a signal representing an operation amount for turning the turning mechanism 3 among signals inputted from the pressure sensor 29 into a speed command, and performs drive control of the turning electric motor 21. Further, the controller 30 is a capacitor by controlling the operation of the motor generator 12 (switching between assist operation and power generation operation), driving control of the lifting magnet 7 (switching between excitation and demagnetization), and driving control of the buck-boost converter 100. 19 charge / discharge control is performed.

  Here, the buck-boost converter 100 in the present embodiment will be described in detail. As shown in FIG. 3, the step-up / step-down converter 100 has a step-up / step-down switching control system, and includes a reactor 101 and transistors 100B and 100C. The transistor 100B is a step-up switching element, and the transistor 100C is a step-down switching element. The transistors 100B and 100C are composed of, for example, an IGBT (Insulated Gate Bipolar Transistor) and are connected in series with each other.

  Specifically, the collector of the transistor 100B and the emitter of the transistor 100C are connected to each other, the emitter of the transistor 100B is connected to the negative terminal of the capacitor 19 and the negative wiring of the DC bus 110, and the collector of the transistor 100C is connected to the DC It is connected to the positive side wiring of the bus 110. Reactor 101 has one end connected to the collector of transistor 100B and the emitter of transistor 100C, and the other end connected to the positive terminal of capacitor 19. A PWM voltage is applied from the controller 30 to the gates of the transistors 100B and 100C.

  Note that a diode 100b, which is a rectifying element, is connected in parallel in the reverse direction between the collector and the emitter of the transistor 100B. Similarly, a diode 100c is connected in parallel in the reverse direction between the collector and emitter of the transistor 100C. A smoothing capacitor 110a is connected in the DC bus 110 between the collector of the transistor 100C and the emitter of the transistor 100B (that is, between the positive side wiring and the negative side wiring of the DC bus 110). The capacitor 110 a smoothes the output voltage from the step-up / down converter 100, the generated voltage from the motor generator 12, and the regenerative voltage from the turning electric motor 21.

  In the buck-boost converter 100 having such a configuration, when supplying DC power from the capacitor 19 to the DC bus 110, a PWM voltage is applied to the gate of the transistor 100B according to a command from the controller 30. Then, the induced electromotive force generated in the reactor 101 when the transistor 100B is turned on / off is transmitted through the diode 100c, and this power is smoothed by the capacitor 110a. When supplying DC power from the DC bus 110 to the capacitor 19, a PWM voltage is applied to the gate of the transistor 100 </ b> C according to a command from the controller 30, and the current output from the transistor 100 </ b> C is smoothed by the reactor 101. Is done.

  Next, the swivel body 4 will be described. FIG. 4 is a perspective view showing the house part 4 b of the revolving structure 4. Hereinafter, in the description of the configuration of the house portion 4b, the front, rear, left and right are based on the lifting magnet vehicle 1 unless otherwise specified. As shown in FIG. 4, the house part 4b is comprised so that it may become substantially U shape in planar view, and it arrange | positions so that the open part which comprises U shape may face the front. Here, in the house portion 4b, the right front portion (the left front portion shown in FIG. 4) of the vehicle is the right front portion Rf, the right rear portion (the left back portion shown in FIG. 4) is the right rear portion Rr, and the left front portion (shown in FIG. 4). The right front portion) is referred to as the left front portion Lf, the left rear portion (the right back portion shown in FIG. 4) is referred to as the left rear portion Lr, and the portion between the right front portion Rf and the left front portion Lf is referred to as the center portion C.

  A driver's cab 4a shown in FIG. 1 is provided corresponding to the left front portion Lf of the house portion 4b, and the base end of the boom 5 shown in FIG. The revolving structure 4 having the house portion 4b is rotated around the axis in the vertical direction by a revolving electric motor 21 (see FIG. 2) provided at the lower portion of the central portion C, that is, left and right along the revolving direction D. Turn to. The right front portion Rf is provided with a step 31 and a handrail 32 for maintenance work.

  The power storage means 120, inverter circuits 18A, 20A, 20B, and the controller 30 shown in FIG. 2 are installed in the right front portion Rf. Openings are formed in the lower left and right surfaces of the right front portion Rf, and the capacitor 19 of the power storage means 120 is installed between the opening 34 (see FIG. 5) on the right surface and the opening 33 on the left surface. Yes. That is, the openings 34 and 33 on the left and right surfaces are formed as vents that allow air for cooling the capacitor 19 to pass in the left and right direction.

  FIG. 5 is a cross-sectional view of the capacitor 19 and the like installed at the lower part of the right front portion Rf as seen from the front. FIG. 5 shows a base frame B composed of a bottom frame Ba, which is a skeleton member that forms the bottom of the house portion 4b, and an outer peripheral frame Bb erected on the periphery (left side in FIG. 5) of the bottom frame Ba. It is shown.

    As shown in FIG. 5, louvers 36 and 35 are respectively provided inside the right-side opening 34 and the left-side opening 33 in the right front portion Rf. A capacitor box 80 including the capacitor 19 is installed on the bottom frame Ba between the louvers 35 and 36 via a pedestal 155 and a vibration isolating rubber 156. The capacitor 19 is formed by arranging a large number of cells 41 in an upper stage and a lower stage, and an upper module 45 is constituted by an assembly of the upper cells 41, and a lower module 45 is constituted by an assembly of the lower cells 41. The capacitor box 80 is obtained by enclosing and reinforcing these modules 45, 45 with an outer frame so as to allow ventilation in the left-right direction.

  An intake duct 40 is connected to the right side (left side in FIG. 5) of the capacitor box 80, and a louver 38 is provided at the upstream end in the intake duct 40 so as to face the louver 36. Also, fans 43, 43 for flowing cooling air from the left to the right in the figure are provided at the left end (right side in FIG. 5) of the capacitor box 80 in correspondence with the upper and lower cells 41, 41, respectively. Further, an exhaust duct 39 is connected to the left side (right side in FIG. 5), and a louver 37 is provided at the downstream end of the exhaust duct 39 so as to face the louver 35.

  The louver 36 on the intake side is inclined downward with respect to the flow direction of the cooling air flowing from the left to the right in the drawing, and the louver 38 in the intake duct 40 downstream thereof is inclined upward in the opposite direction to the louver 36. ing. Further, the louver 37 in the exhaust duct 39 is inclined downward with respect to the flow direction of the cooling air, and the exhaust-side louver 35 downstream thereof is inclined upward in the opposite direction to the louver 37. With such a louver configuration, the inside of the capacitor box 80 is waterproofed.

  Further, as described above, since the capacitor box 80 is installed on the bottom frame Ba, its installation position is lower than the opening 34 on the right side and the opening 33 on the left side. For this reason, the intake duct 40 and the exhaust duct 39 have a vertically asymmetric shape. That is, the intake duct 40 and the exhaust duct 39 have a shape that expands downward from the louvers 38 and 37 on both sides toward the capacitor box 80.

  Further, in the intake duct 40, a partition wall 44 that connects the upstream end between the upper module 45 and the lower module 45 and the downstream end of the louver 38 and partitions the interior of the intake duct 40 up and down. Is provided. The partition wall 44 also distributes the same amount of cooling air as the upper module 45 to the lower module 45 which is disposed below the louver 38 arranged side by side without being directly opposed. In order to increase the flow rate at the lower inlet than the flow rate at the upper inlet (louver 38 outlet), it is not horizontal but inclined downward with respect to the flow direction of the cooling air. Has been.

  Here, the capacitor box 80, the intake duct 40, the exhaust duct 39, the opening 34, the opening 33, and the like are installed in the right front portion Rf, but are installed below the cab 4a in the left front portion Lf. It may be.

  Further, in the left rear portion Lr of FIG. 4, an engine radiator, an oil cooler, an intercooler, a fuel cooler, a hybrid system radiator (hybrid radiator), a heat exchanger for an air conditioner of the cab 4a (an air conditioner condenser). ) (Both not shown) are installed.

  Further, the engine 11, the transmission 13, the motor generator 12, the main pump 14, and the like shown in FIG. 2 are installed from the left rear portion Lr to the right rear portion Rr, that is, below the engine hood H constituting the top plate. ing. A fan (not shown) is connected to the engine 11, and the fan rotates with the rotation of the engine 11, so that the air vent 46 provided on the left side surface of the left front portion Lf is directed into the left rear portion Lr. Air flows, and each of the coolers installed in the left rear portion Lr is cooled. A pump chamber (not shown) that houses the motor generator 12 and the main pump 14 is formed in the right rear portion Rr.

  The central portion C is provided with a so-called A frame 47 that is a frame that supports the boom 5 so as to sandwich the boom 5 in a vertically movable manner, and a boom cylinder frame 48 that is a frame to which the base end of the boom cylinder 8 is attached. A turning electric motor 21 (see FIG. 2) is disposed in the vicinity of the rear of the A frame 47.

  Next, the capacitor box 80 described in FIG. 5 will be described in detail. 6 is a perspective view showing the capacitor box 80, FIG. 7 is a partially broken perspective view showing a state in which the side outer frame 55 and the upper outer frame 56 are removed from the capacitor box 80 shown in FIG. 6, and FIG. FIG. 9 is a perspective view showing a submodule 51 in FIGS. 6 to 8.

  As shown in FIG. 9, the capacitor box 80 is schematically shown in FIG. 7 and FIG. 8 as a submodule 51 having a plurality of cells 41 mounted thereon (described later in detail) so as to be sandwiched between an upper inner frame 50 and a lower inner frame 150. As shown in FIG. 6, the aggregate is reinforced by an outer frame 52 as shown in FIG.

  As shown in FIG. 9, the upper inner frame 50 is configured in a rectangular parallelepiped shape in which a bus bar is wired inside, and a pair of longitudinal side walls 50 b constituting the rectangular parallelepiped shape, and a short-side direction orthogonal to the longitudinal side wall 50 b. The lower inner frame 150 has a pair of side walls 50c, and a rectangular plate 50a configured to be rectangular (rectangular) in plan view, and a short length along the circumferential direction at the periphery of the rectangular plate 50a. In addition, it has a pair of side walls 50b in the longitudinal direction and a pair of side walls 50c in the short direction perpendicular thereto. The submodule 51 is configured by joining a plurality of cells 41 vertically and horizontally to the upper inner frame 50 so as to hang down, and supporting and reinforcing the plurality of cells 41 from the lower surface by the inner frame 150. . A space is provided at one end of the submodule 51 in the longitudinal direction (end on the exhaust side; end on the front side in the figure), and the space is provided in the space as shown in FIGS. 5 and 8. A fan 43 is attached.

  A plurality of submodules 51 (four in this case) are arranged side by side along the front-rear direction (vertical direction in FIG. 5) of the traveling mechanism 2 on which the revolving structure 4 is mounted so as to be capable of revolving. As a result, as shown in FIGS. 7 and 8, the long side walls 50b constituting the submodule 51 are arranged in the front-rear direction of the traveling mechanism 2 (the vertical direction in FIG. 5) and are adjacent to each other. The side walls 50b, 50b are arranged so as to face the turning direction D (see FIGS. 4 and 7) of the turning body 4.

  The upper module 45 with the submodule 51 arranged in parallel is superposed on the lower module 45 with the submodule 51 arranged in parallel, and the upper (upper inner frame) of each submodule 51 that constitutes the upper and lower modules 45, 45, respectively. 50) is provided with a bus bar connected to the cell 41 and connected to a terminal block 95 for connection to an external arrangement and a safety switch 96 that can be manually disconnected during maintenance. The upper and lower modules 45, 45 are fixed to the outer frame 52 by screwing or the like, for example.

  As shown schematically in FIG. 6, the outer frame 52 includes a bottom outer frame 54, a side outer frame 55, and a top outer frame 56.

  The bottom outer frame 54 is for mounting the entire submodule 51, that is, the upper and lower modules 45, 45, and the side outer frame 55 is for covering the entire submodule 51 from the four sides. The frame 56 is a top plate and covers the entire submodule 51 from above, and the submodule 51 is bolted to the outer frame 52. As a result, the entire submodule 51 is reinforced and vibrations are prevented.

  The side outer frame 55 has openings 57 at predetermined positions corresponding to the plurality of cells 41. Here, the three in the upper and lower stages face the turning direction D of the revolving structure 4, that is, the direction in which the cooling air flows (the left-right direction in FIG. 5), respectively. ) And the ribs 58 extending in the vertical direction are provided between the adjacent openings 57 and 57. The openings 57 and ribs 58 of the side outer frame 55 shown on the near side in FIG. 6 are also provided at the same position (opposite position) on the side outer frame 55 on the back side in the drawing, The opening 57 of the side outer frame 55 is opened to face the fan 43 shown in FIG.

  The outer frame 52 and the inner frames 50 and 150 form a case.

  According to the construction machine 1 having such a configuration, when the swivel body 4 turns, the wind generated by the turning serves as cooling air, and the opening 34 on the right surface of the right front portion Rf of the house portion 4b, the intake duct 40, the capacitor box. 80 is introduced into the capacitor box 80 through the opening 57 (see FIG. 6), contacts each cell 41, goes downstream while cooling the cell 41, and passes through the fan 43 and the opening 57 of the capacitor box 80 to form the capacitor. It is discharged out of the box 80 and discharged to the outside through the exhaust duct 39 and the opening 33 on the left side of the right front portion Rf of the house portion 4b, and the cell 41 can be efficiently cooled.

  That is, in this embodiment, since the opening 57 opened toward the turning direction D of the revolving structure 4 is provided in the case that accommodates the plurality of cells 41, when the revolving structure 4 turns. The wind generated by this turning flows as cooling air in the case through the opening 57 of the case, and the cell 41 can be efficiently cooled.

  Further, since the case has the fan 43 that discharges the cooling air from the inside of the case to the outside, the cooling air by the fan 43 is further added to the wind generated by the turning of the turning body 4, thereby further increasing the cell 41. Can be cooled efficiently.

  Further, in the intake duct 40 which is a flow path for guiding outside air as cooling air to the upper module 45 and the lower module 45 in which the plurality of cells 41 are arranged, cooling air directed toward the upper module 45 and the lower module 45 is evenly distributed. The air intake duct 40 is divided into upper and lower parts so as to be distributed to each other, and the partition wall 44 is provided so as to be inclined with respect to the flow direction of the cooling air. Thus, the entire cell is uniformly distributed, and the cell 41 can be cooled more efficiently.

  The case preferably has a fan for supplying outside air as cooling air into the case. When such a configuration is adopted, since the intake side fan is added to the exhaust side fan 43, the cell 41 can be cooled more efficiently.

  Moreover, it is preferable that the both fans or the exhaust side fan 43 have a configuration in which the wind direction is switched according to the turning direction D of the revolving structure 4. When such a configuration is adopted, when the swing body 4 swings in one direction, the fan may be driven so that the wind direction of the fan is the same as the wind generated by the one-way swing of the swing body 4. In the case where the revolving body 4 turns in a direction opposite to one direction, the fan can be driven so as to be in the same direction as the wind generated by turning in the opposite direction of the revolving body 4 by switching the wind direction of the fan. . Therefore, the cell 41 can be cooled more efficiently by the fan whose wind direction can be switched regardless of the direction in which the revolving structure 4 revolves.

  Incidentally, since a push-up load may act on the case from below during work, the fan is preferably provided on the side wall or the upper wall of the case. In correspondence with this configuration, an opening on the exhaust side of the case is also provided on the side wall or the upper wall of the case.

  Note that the case referred to in this embodiment has two types of frame members, the outer frame 52 and the inner frames 50, 150, the opening 57 is provided in the outer frame 52, and the fan 43 has the inner frame 50, Of course, the present invention can be applied to a case made up of one member. In this case, the opening 57 and the fan 43 are provided in the case.

  FIG. 10 is a plan configuration diagram showing the inside of the capacitor box of the construction machine according to the second embodiment.

  The difference between the second embodiment and the first embodiment is that the interval x between the side wall 90a of the case 90 containing the plurality of cells 41 and the cell 41 located near the side wall 90a is set between the plurality of cells 41. It is a point made wider than the parallel arrangement interval y.

  According to the second embodiment, the interval x between the side wall 90a of the case 90 that accommodates the plurality of cells 41 and the cell 41 located near the side wall 90a is arranged in parallel between the plurality of cells 41. Since the distance y is larger than the distance y, the cell 41 is arranged away from the side wall 90a of the case 90 that is most affected by sunlight and the heat of the engine, so that the heat effect on the cell 41 is reduced and the entire cell is uniform. The cell 41 can be cooled more efficiently.

  The second embodiment is also different from the first embodiment in that the drive of the fan 43 is controlled by the control means 81. That is, in the second embodiment, the temperature information detecting means 82 for detecting information related to the temperature of the cell 41 and the control means for controlling the driving of the fan 43 based on the information detected by the temperature information detecting means 82. 81.

  Here, various types of temperature information detecting means 82 for detecting information related to the temperature of the cell 41 can be used, and a temperature sensor is used here. Here, two temperature sensors are arranged for one case 90, a temperature sensor 82 a arranged further upstream than the cell 41 on the most upstream side with respect to the cooling air, and a corner on the downstream side of the case 90. And a temperature sensor 82b disposed. The temperature sensor 82a measures the temperature at the lowest temperature in the case 90, and the temperature sensor 82b measures the temperature at the highest temperature in the case 90.

  The control means 81 controls the driving of the fan 43 based on the detected temperatures from these temperature sensors 82a and 82b. Specifically, when the detected temperature is equal to or higher than a preset temperature, driving of the fan 43 is started, and when the detected temperature falls below the preset temperature, the driving of the fan 43 is stopped.

  Further, when a fan is also provided on the intake side (upstream side), the control means 81 performs control as follows. Specifically, when the detected temperature does not reach the preset low temperature set temperature, both the intake side fan and the exhaust side fan 43 are stopped, and the detected temperature becomes equal to or higher than the set temperature at the low temperature. Only the exhaust side fan 43 starts to be driven, and thereafter, the intake side fan is also driven according to the detected temperature.

  According to the second embodiment, since the fan drive is controlled by the control unit 81 based on the temperature of the cell 41 detected by the temperature sensor 82, the cell is operated by the fan while saving energy for fan drive. 41 can be efficiently cooled.

  The configuration having the control means 81 can of course be applied to a configuration in which the interval x between the side wall 90a of the case 90 and the cell 41 is substantially the same as the parallel interval y between the cells 41.

  FIG. 11 is a plan configuration diagram showing the inside of the capacitor box of the construction machine according to the third embodiment.

  The third embodiment is different from the second embodiment in that a plurality of cells 41 are arranged in a staggered manner with respect to the flow direction of cooling air (from the top to the bottom in the drawing).

  According to the third embodiment as described above, the cells 41 are arranged in a line with respect to the flow direction of the cooling air, so that the cooling air hits the uppermost cell 41 and the cooling efficiency for the cells 41 on the downstream side becomes worse. Compared with the configuration, the cooling air comes into contact with each cell 41, the entire cell can be uniformly cooled, and the cell 41 can be cooled more efficiently.

  In the third embodiment, the configuration having the control means 81 described in the second embodiment may be omitted, and the configuration of the staggered arrangement of the third embodiment is the same as that of the case 90. Of course, the present invention can also be applied to a configuration in which the interval x between the side wall 90a and the cell 41 is substantially the same as the parallel interval y between the cells 41.

  FIG. 12 is a plan view showing the inside of the capacitor box of the construction machine according to the fourth embodiment, and FIG. 13 is a view taken in the direction of arrows XIII-XIII in FIG.

  The fourth embodiment is different from the first embodiment in that the cooling air is supplied to the cells 41 arranged on the exhaust side separately from the flow path of the cooling air flowing in the case 90 containing the plurality of cells 41. This is a point provided with a bypass flow path 85 for sending by bypass.

  Here, the bypass flow path 85 is provided along the outside of the bottom part or the side part of the cell region 86 in which the plurality of cells 41 are arranged and accommodated, and the flow path 84 for flowing cooling air, A plurality of communication holes 83 communicating with the flow path 84 and the cell region 86.

  A large number of communication holes 83 are provided on both sides between the cells 41 arranged in the flow direction of the cooling air.

  According to the fourth embodiment, the cells arranged on the exhaust side compared to the configuration (cell region 86) in which the cooling air hits the most upstream cell 41 and the cooling efficiency for the cell 41 on the exhaust side deteriorates. The cooling air is also sent to the 41 through the bypass passage 85, so that the entire cell can be uniformly cooled, and the cell 41 can be cooled more efficiently.

  Of course, the configuration of the fourth embodiment is also applicable to the second and third embodiments.

  FIG. 14 is a block diagram showing an internal configuration of an electric system, a hydraulic system, etc. of a construction machine according to still another embodiment.

  The configuration shown in FIG. 14 is referred to as a so-called series system. In the configuration of the parallel system shown in FIG. 2, instead of the configuration in which the transmission 13 and the main pump 14 are connected, the pump motor 140 and the inverter 18D are used. Are separately provided, and all the power of the engine 11 is once converted into electric energy to drive various driving elements.

  Specifically, inverter 18D is electrically connected to DC bus 110 (see FIG. 3) of power storage means 120 and controlled by controller 30. The output terminal of the inverter 18D is connected to the pump motor 140, and the pump motor 140 is driven and controlled by the inverter 18D. In addition, the electric power generated by the main pump 14 in the pump motor 140 is supplied as regenerative energy to the power storage means 120 via the inverter 18D.

  The present invention has been specifically described above based on the embodiment. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, a lifting magnet type hybrid is described as being particularly suitable. Although the application to a type construction machine is described, it can also be applied to other construction machines such as an excavator, a wheel loader, and a crane.

  DESCRIPTION OF SYMBOLS 1 ... Construction machine, 4 ... Swing body, 11 ... Engine, 12 ... Motor generator (electric power generation means), 21 ... Electric motor for turning (electric drive means), 40 ... Intake duct, 41 ... Cell, 43 ... Fan, 44 ... Partition wall 45 ... upper and lower modules, 50 and 150 ... inner frame (case), 52 ... outer frame (case), 57 ... opening, 81 ... control means, 82, 82a, 82b ... temperature sensor (temperature information detection) Means), 83 ... Communication hole, 84 ... Flow path, 85 ... Bypass flow path, 90 ... Case, 90a ... Side wall, 120 ... Power storage means, D ... Swivel direction, x ... Side wall and close to the side wall Spacing between cells, y: parallel spacing between cells.

Claims (10)

In a construction machine comprising an engine, power generation means for generating electric power by driving the engine, power storage means for storing electric power generated by the power generation means, and electric drive means for driving with electric power from the power storage means,
The power storage means is installed in a revolving body that is turned by driving of the electric drive means, and includes a case containing a plurality of cells,
The construction machine is characterized in that the case has an opening that is opened in a turning direction of the revolving structure and allows an outside air to flow as cooling air into the case.   The construction machine according to claim 1, wherein the case has a fan that discharges cooling air from the inside of the case to the outside.   The construction machine according to claim 2, wherein the case includes a fan that supplies outside air as cooling air into the case.   The construction machine according to claim 2 or 3, wherein the fan has a wind direction switched according to a turning direction of the turning body.   The construction machine according to any one of claims 2 to 4, wherein the fan is provided on a side wall or an upper wall of the case. Temperature information detecting means for detecting information on the temperature of the cell;
The construction machine according to any one of claims 2 to 5, further comprising a control unit that controls driving of the fan based on information detected by the temperature information detection unit.   The distance between the side wall constituting the case and the cell located near the side wall is wider than the parallel arrangement distance between the plurality of cells. Construction machinery.   The construction machine according to any one of claims 1 to 7, wherein the plurality of cells are arranged in a staggered manner with respect to the flow direction of the cooling air.   The said case has a bypass flow path for bypassing and sending cooling air to a cell arranged on the exhaust side separately from the cooling air flow path flowing in the case. The construction machine as described in any one of 1-8. An upper module in which the plurality of cells are disposed, and a lower module in which the plurality of cells are disposed under the upper module;
In the flow path that guides outside air as cooling air to the upper module and the lower module, the flow path is divided up and down so as to evenly distribute the cooling air toward the upper module and the lower module, The construction machine according to any one of claims 1 to 9, further comprising a partition wall arranged to be inclined with respect to a flow direction of the cooling air.

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