JP5189041B2 - Hybrid construction machine - Google Patents

Description

  The present invention relates to a hybrid construction machine.

  For example, in construction machines such as excavators, lifting magnets, and cranes, operating air conditioner heat exchangers (condensers for air conditioners) and operation using the cooling fan that rotates when the engine is driven as cooling air A configuration is known in which an oil cooler for cooling oil and an engine cooler composed of an engine radiator are passed in this order to air-cool them (for example, see Patent Document 1).

JP 2006-291601 A

  In recent years, hybrid construction machines have been developed that include a so-called hybrid system that includes a battery and an AC motor and assists driving of the engine by a power running operation of the AC motor. In this hybrid type construction machine, it is necessary to provide a radiator (hybrid radiator for cooling) such as an inverter used in the hybrid system separately from the engine radiator, and the hybrid radiator is arranged in the cooling air flow path by the cooling fan. Need to be cooled.

  Moreover, in a hybrid type construction machine, the engine speed may be reduced for energy saving or the like. Here, the rotation speed of the cooling fan also decreases corresponding to the decrease in the engine speed, and the cooling capacity for the hybrid radiator and the engine cooler decreases, but the engine speed also decreases, so the problem is Absent. However, the cooling effect of the air conditioner condenser for cooling the cab will be reduced, which is a problem.

  The present invention has been made in view of the above, and an object of the present invention is to provide a hybrid construction machine having a cooling structure in which the cooling effect on an air conditioner capacitor is improved.

In order to achieve the above object, a hybrid 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 a power from the power storage unit. And a fan that forms a cooling air flow path in the body by rotating outside by driving the engine and sucking outside air from a vent hole provided in the body. An engine cooler disposed upstream of the fan in the cooling air flow path, an intercooler disposed upstream on the upstream side of the engine cooler, and a hybrid radiator disposed upstream on the upstream side of the intercooler And an air conditioner condenser arranged on the lower side upstream of the engine cooler, and passed to the upstream side of the hybrid radiator. On the upstream side of the air-conditioning condenser with mouth is provided, characterized in that the wall is provided.
The hybrid construction machine according to the present invention is driven by an engine, power generation means for generating power by driving the engine, power storage means for storing power generated by the power generation means, and power from the power storage means. And a fan that rotates by driving of the engine and forms a cooling air flow path in the body by sucking outside air from a vent provided in the body, An engine cooler disposed on the upstream side of the fan in the cooling air flow path, an intercooler disposed on the upstream side of the fan, and a radiator for hybrid cooling the coolant of the generator and the electric drive means And an air conditioner condenser disposed on the upstream side of the fan, and the ventilation on the upstream side of the hybrid radiator Together they are provided, the air-conditioning condenser, the engine cooler, and the intercooler, and being arranged so as to prevent the cooling air flows having passed through the hybrid radiator.

  In the hybrid type construction machine described above, in the cooling air flow path formed by driving the fan, the upper side of the hybrid radiator, intercooler, and engine cooler is located above the flow path from upstream to downstream. Arranged in the order of the parts, on the lower side of the flow path, arranged in the order of the lower part of the condenser for the air conditioner and the cooler for the engine. The cooler is lined up, and the lower side of the flow path has less resistance to the flow of cooling air, so even if the engine speed decreases and the fan speed decreases, the upstream side is blocked by the wall. In addition, the amount of cooling air increases in the lower flow path, and the cooling effect on the air conditioner capacitor is improved.

Here, the cooling liquid cooled by the hybrid radiator may be circulated in the order of the controller and the power generation means.
The cooling liquid cooled by the hybrid radiator can be circulated in the order of the controller and the power generation means.
In addition, a transmission may be disposed between the engine and the power generation means, and the coolant cooled by the hybrid radiator may cool the transmission.
Further, the circulation system in which the coolant cooled by the hybrid radiator circulates may be a system different from the circulation system that is configured by the engine cooler.
Furthermore, it is preferable that the hybrid radiator has an air vent hole at a position higher than the electric drive means.

  As described above, the air vent hole of the hybrid radiator is provided at a position higher than that of the electric drive means, so that the air mixed in the cooling water flowing through the hybrid radiator and cooling the electric drive means is suitably used. Can be removed.

  ADVANTAGE OF THE INVENTION According to this invention, the hybrid type construction machine which has a cooling structure with the improvement effect of the cooling with respect to the capacitor | condenser for an air-conditioner was provided.

It is a perspective view showing the appearance of the construction machine concerning one 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 figure which shows arrangement | positioning of each cooler in a house part. It is the figure which looked at arrangement | positioning of each cooler in a house part from the vent hole side. It is a block diagram for demonstrating the cooling fluid circulation system for hybrid systems. 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). ) Is housed (house) 4b that houses a power source 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 (body) 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 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 is attached to the center portion C so as to be movable up and down. The house portion 4b is rotated about the vertical axis by the turning electric motor 21 (see FIG. 2) provided in the lower portion of the central portion C, that is, is turned left and right along the turning direction D. 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). ) Is installed (see FIG. 6; details will be described later).

  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 (see FIG. 6) is connected to the engine 11, and the fan rotates with the rotation of the engine, so that air flows into the left rear portion Lr from the vent 46 provided on the left side surface of the left front portion Lf. Flows, and the respective coolers installed in the left rear portion Lr are cooled (details will be described later). 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 arrangement of each cooler in the left rear portion Lr in FIG. 4 will be described with reference to FIGS. 6 and 7. FIG. 6 is a view of the inside of the left rear portion Lr of the house portion 4b as viewed from the vehicle rear side. FIG. 7 is a view of each cooler disposed in the left rear portion Lr of the house portion 4b as viewed from the vent 46 side (the left side surface of the vehicle).

  As shown in FIG. 6, the engine 11 is disposed on the right rear portion Rr side in the left rear portion Lr of the house portion 4 b, and a rotating shaft 61 is connected to the engine 11 and a fan 62 that rotates by driving of the engine 11 is provided. It is done. Then, the fan 62 rotates and sucks outside air from the vent 46 provided on the upper left side of the house portion 4b, whereby a cooling air flow path is formed in the left rear portion Lr of the house portion 4b. The cooling air passage formed by the fan 62 includes an engine cooler 71, an intercooler 73, a fuel cooler 75, a hybrid radiator (hybrid system radiator) 77, and an air conditioner condenser (air conditioner heat exchanger). ) 79 is arranged. The lower side of the vent 46 is closed by the side wall 49 of the house part 4b.

  The engine cooler 71 includes an engine radiator 71A that cools engine coolant and an oil cooler 71B that cools hydraulic oil. The engine radiator 71A and the oil cooler 71B are in parallel to the fan 62, respectively. It is integrated so as to be aligned (so as to be aligned in the front-rear direction of the vehicle (the vertical direction in FIG. 6)), and is disposed so as to face the fan 62 and cover the entire upstream side of the fan 62.

  An intercooler 73 is disposed upstream of the engine cooler 71 and on the upper side. A fuel cooler 75 is disposed on the upstream side of the intercooler 73 (in front of the intercooler 73), and further, on the upstream side of the fuel cooler 75 (in front of the fuel cooler 75), a hybrid radiator is provided. 77 is arranged. On the other hand, an air conditioner condenser 79 is arranged on the upstream side and the lower side of the engine cooler 71. The air conditioner capacitor 79 is disposed below the intercooler 73.

  Of the above-described coolers, the intercooler 73 is for cooling the supercharged air for the purpose of increasing the supercharging efficiency of the turbocharger. The fuel cooler 75 is for cooling the fuel. The hybrid radiator 77 is a radiator for cooling an inverter and the like constituting the hybrid system. Specifically, the step-up / down converter 100, the inverter circuits 18A, 20A, and 20B, the controller 30, and the turning electric motor 21 are provided. , A heat exchanger for cooling the cooling water circulating in the pipes provided in the motor generator 12, the transmission 13, and the like. The hybrid radiator 77 is provided with an air vent hole (not shown) for removing air mixed in the refrigerant at a position higher than the turning electric motor 21.

  Here, a coolant circulation system for a hybrid system including the hybrid radiator 77 will be described. FIG. 8 is a block diagram for explaining the coolant circulation system. As shown in FIG. 8, the cooling circulation system for the hybrid system includes a hybrid radiator 77, a pump 93 driven by a pump motor 91, and a servo control unit 60. The coolant radiated by the hybrid radiator 77 is circulated by the pump 93 and sent to the servo control unit 60. The servo control unit 60 is a unit that accommodates the controller 30 shown in FIG. 2, and has a function of controlling operations of the pump motor 91, the turning electric motor 21, and the motor generator 12 by transmission of an electric signal or the like. This servo control unit 60 has a piping for cooling the controller 30 including the step-up / down converter 100, the inverter circuits 18A, 20A and 20B, and the CPU which converts the operation amount of the lever into a command value for each electric motor. The coolant circulates in this pipe. In particular, the controller 30 including a CPU having a low heat resistant temperature is piped so as to be cooled first by the coolant cooled by the hybrid radiator 77. The coolant that has passed through the piping of the servo control unit 60 cools the turning electric motor 21, the motor generator 12, and the transmission 13 in this order, and then returns to the hybrid radiator 77. A temperature sensor 95 for detecting the temperature of the coolant is preferably provided at the inlet of the servo control unit 60. Furthermore, it is better to provide a display device for displaying the detected temperature. Thereby, when the hybrid radiator 77 is clogged and the cooling performance is lowered, the outputs of the turning electric motor 21 and the motor generator 12 (or one of them) can be limited based on the detected temperature value. As a result, continuous operation can be performed, and continuous work can be performed without stopping the hybrid construction machine 1.

  According to the above-described configuration in which the respective coolers are arranged as shown in FIGS. 6 and 7, the cooling air flow path of the cooling air sucked into the interior of the house portion 4 b from the vent hole 46 by the rotation of the fan 62. The wind flowing on the upper side of the engine passes in the order of the hybrid radiator 77, the fuel cooler 75, the intercooler 73, and the engine cooler 71 from the upstream (vent 46) toward the downstream (fan 62). Thereby, each cooler of hybrid radiator 77, fuel cooler 75, intercooler 73, and engine cooler 71 (upper part) is air-cooled. In particular, since the hybrid radiator 77 is located at the uppermost stream, the hybrid radiator 77 is sufficiently cooled and can prevent deterioration of the electrical performance of the hybrid system.

  On the other hand, of the cooling air sucked into the house portion 4b from the air vent 46 by the rotation of the fan 62, the air flowing below the cooling air flow path flows from the upstream (air vent 46) to the downstream (fan 62). The air-conditioner condenser 79 and the engine cooler 71 pass in this order. Thereby, each cooler of the condenser 79 for air conditioners and the cooler 71 for engines (lower part) is air-cooled.

  Here, since the lifting magnet vehicle 1 is a hybrid construction machine, the rotational speed of the engine 11 may be reduced in order to save energy. At this time, since the rotation of the fan 62 also decreases corresponding to the decrease in the rotational speed of the engine 11, the intake capacity by the fan 62 decreases and the cooling capacity decreases. However, among the hybrid radiator 77, the fuel cooler 75, the intercooler 73, and the engine cooler 71 that are arranged on the upper side of the cooling air flow path, the fuel cooler 75, the intercooler 73, and the engine cooler 71, in particular, Since the number of rotations of 11 decreases, a decrease in cooling efficiency is not particularly problematic. Further, the hybrid radiator 77 is arranged on the upstream side of the flow path with respect to the other coolers, so that a decrease in cooling capacity is suppressed as compared with the other coolers. The coolant in the hybrid radiator 77 is not generated, and each component of the hybrid system is cooled by the pump 91 driven by the pump motor 93. Therefore, even if the engine 11 is temporarily stopped, Each included device can be cooled appropriately. As described above, the hybrid radiator 77 is well cooled. However, when the cooling efficiency for the air conditioner condenser 79 is lowered, the function of the air conditioner in the cab 4a may be hindered.

  On the other hand, in the lifting magnet vehicle 1 according to the present embodiment, as described above, in the cooling air flow path formed by driving the fan 62, from upstream to downstream, on the upper side of the flow path, The hybrid radiator 77, the fuel cooler 75, the intercooler 73, and the upper part of the engine cooler 71 are arranged in this order, and the air conditioner condenser 79 and the lower part of the engine cooler 71 are arranged below the flow path. In this way, many coolers are arranged above the flow path with respect to the lower side of the flow path, and the lower side of the flow path has a smaller resistance to hinder the flow of cooling air. Even if the rotational speed of the engine 62 is reduced by the above and the rotational speed of the corresponding fan 62 is reduced, the cooling air flow is reduced in the lower flow path blocked by the side wall 49 of the house portion 4b. The amount is increased, the cooling effect is improved with respect to the air-conditioning condenser 79.

  Further, in the lifting magnet vehicle 1 according to the present embodiment, the air vent hole of the hybrid radiator 77 is provided at a position higher than that of the turning electric motor 21, so that it flows through the hybrid radiator 77 and cools the turning electric motor 21. The air mixed in the cooling water can be suitably removed.

  FIG. 9 is a block diagram illustrating an internal configuration of an electric system, a hydraulic system, and the like of a construction machine according to still another embodiment.

  The configuration shown in FIG. 9 is 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.

  In the above-described embodiment, the configuration in which the fuel cooler 75 is provided between the intercooler 73 and the hybrid radiator 77 in the cooling air flow path is described. However, the fuel cooler 75 is not disposed at this position. May be. That is, in the lifting magnet vehicle 1 according to the above embodiment, the number of coolers disposed below the flow path is smaller than the number of coolers disposed above the flow path, so that the lower flow path In this case, the air volume of the cooling air increases and the cooling effect on the air conditioner condenser 79 arranged on the lower side is improved. Therefore, if this relationship is maintained, the arrangement of each cooler can be changed. Therefore, for example, in the above-described embodiment, the engine radiator 71A and the engine cooler 71B are integrated so that they are arranged in parallel in the cooling air flow path. However, the engine radiator 71A and the engine are described. The cooling device 71B may be arranged in series in the cooling air flow path.

  Moreover, in the said embodiment, although the lower side of the upstream of a cooling wind flow path was described about the structure obstruct | occluded by the side wall 49 of the house part 4b, the lower lower side of the upstream of a flow path is obstruct | occluded by the other member. It is also applicable to cases where

  DESCRIPTION OF SYMBOLS 1 ... Lifting magnet vehicle, 4 ... Swing body, 4b ... House part, 11 ... Engine, 12 ... Motor generator (electric power generation means), 21 ... Electric motor for turning (electric drive means), 46 ... Vent, 62 ... Fan, DESCRIPTION OF SYMBOLS 71 ... Engine cooler, 73 ... Intercooler, 75 ... Fuel cooler, 77 ... Hybrid radiator, 79 ... Air-conditioner capacitor, 120 ... Power storage means

Claims (6)

Hybrid construction machine comprising: an engine; power generation means for generating 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 Because
A fan that rotates by driving the engine and forms a cooling air flow path in the body by sucking outside air from a vent provided in the body;
An engine cooler disposed upstream of the fan in the cooling air flow path;
Intercooler disposed upstream of the fan,
A hybrid radiator for cooling a coolant of the generator and the electric drive means ;
And the air-conditioning condenser disposed upstream of said fan,
With
The air vent is provided on the upstream side of the hybrid radiator, and the air conditioner condenser is disposed so as to suppress the flow of cooling air that has passed through the engine cooler, the intercooler, and the hybrid radiator. A hybrid construction machine characterized by being made .   The hybrid construction machine according to claim 1, wherein the coolant cooled by the hybrid radiator circulates in the order of a controller and the power generation means.   The hybrid construction machine according to claim 1 or 2, wherein the coolant cooled by the hybrid radiator circulates in the order of a controller and the power generation means.   A transmission is disposed between the engine and the power generation means,
  The hybrid type construction machine according to any one of claims 1 to 3, wherein the coolant cooled by the hybrid radiator cools the transmission.   The hybrid system according to any one of claims 2 to 4, wherein the circulation system in which the coolant cooled by the hybrid radiator circulates is a system different from the circulation system configured by the engine cooler. Construction machinery. The hybrid construction machine according to any one of claims 1 to 5, wherein the hybrid radiator has an air vent hole at a position higher than the electric drive means.

Images