JP6291324B2 - Hybrid construction machine - Google Patents

Description

  The present invention relates to a hybrid construction machine including an electric motor such as a motor and an inverter and a power storage device that supplies electric power to the electric motor.

  In recent years, hybrid and electric vehicles are widely used in automobiles from the viewpoint of energy saving, and hybrids are also being promoted in construction machines. In general, a construction machine such as a hydraulic excavator driven by a hydraulic system has a hydraulic pump that enables a maximum load work and a large-sized drive that drives the hydraulic pump so that it can handle all work from a light load to a heavy load. Equipped with an engine.

  However, heavy-duty work such as heavy excavation work that frequently excavates and loads earth and sand in hydraulic excavators is a part of the whole work, and the engine capacity during light-load work such as horizontal pulling to level the ground Will be left behind. This is one factor that makes it difficult to reduce the amount of fuel consumed by the excavator (hereinafter sometimes abbreviated as fuel efficiency). In view of this point, a hybrid construction machine is known in which an engine is downsized to reduce fuel consumption, and an output shortage due to the downsizing of the engine is assisted by the output of a power storage device and an electric motor. Electric devices such as power storage devices and electric motors that constitute hybrid construction machines require appropriate temperature control for thermal protection of the drive circuit and high-efficiency operation.

  In order to cool an electric motor and a power storage device, a system that uses an air conditioner to adjust the temperature is known. For example, Patent Document 1 includes a configuration including an air conditioner unit for a vehicle interior, a battery cooling unit that cools a vehicle-mounted traveling battery, and a refrigerant circulation circuit that supplies refrigerant to the air conditioner unit for the vehicle interior and the battery cooling unit. It is disclosed. The battery cooling unit cools the battery by sending cool air into a space in which the battery is hermetically stored. The battery cooling unit includes a battery cooling evaporator that cools the atmosphere by absorbing heat accompanying the vaporization of the refrigerant, a battery cooling blower that blows air to the battery cooling evaporator and supplies cooling air into a space in which the battery is hermetically housed. It has.

JP 2012-30663 A

  In Patent Document 1, the battery cooling evaporator and the battery are arranged linearly along the air flow direction, and the air cooled by the battery cooling evaporator is blown to the battery. For this reason, there is a possibility that water droplets generated when the air blown to the battery is cooled by the battery cooling evaporator may enter the battery. If water drops enter the battery, it will lead to a decrease in battery insulation, which is not preferable.

  The present invention has been made in view of the above-described actual situation, and an object thereof is to provide a hybrid construction machine in which water droplets are unlikely to enter the power storage device.

To achieve the above object, a hybrid construction machine according to the present invention, the prime mover and the working machine that will be driven by the prime mover, the cab operation apparatus of the working machine is installed, the power to the prime mover comprising an electric motor for performing auxiliary and energy recovery from the prime mover, a power storage device for exchanging electric power between said electric motor, a cooling unit for cooling the power storage device, wherein the cooling unit, the power storage device and the case of the closed structure airflow Ru is circulated path for cooling the housed Rutotomoni said power storage device formed therein, disposed within the casing, along the air in the casing to the flow path a blower for circulating, provided in the casing, has a temperature adjustment heat exchanger for cooling air circulating in the casing, the wall of the case with partitioning in the case up and down A partition wall for forming the flow path is provided, and the air blower is configured to circulate air around the partition wall in the vertical direction, and the power storage device is located above the partition wall. It is arrange | positioned and the said heat exchanger for temperature control is arrange | positioned below the said partition wall, It is characterized by the above-mentioned.

In the present invention, the power storage device is installed in a position that does not face the outlet of the air cooled by the temperature adjustment heat exchanger in the case. That is, the power storage device is provided at a position where the air cooled by the temperature control heat exchanger does not directly hit. Therefore, the air cooled by the temperature adjustment heat exchanger hits the power storage device after changing its direction by hitting the wall of the case. Therefore, even if the air is cooled by the heat exchanger for temperature control and moisture is contained in the air, the moisture-containing air hits the power storage device after the moisture hits the wall of the case and is separated. It will be. As a result, the present invention can prevent water droplets from entering the power storage device, and can prevent the power storage device from being damaged by water droplets. Of course, since the case has a hermetically sealed structure, it is possible to prevent dust and the like from entering the case even in a poor working environment where dust and the like dance. In addition, since the power storage device and the temperature control heat exchanger are arranged in the vertical direction, in addition to preventing water droplets from entering the power storage device, the width of the case can be made compact.

Further, the hybrid construction machine according to the present invention includes a prime mover, a work machine driven by the prime mover, a cab in which an operation device for the work machine is installed, power assistance to the prime mover and the prime mover. An electric motor that recovers energy, a power storage device that transfers power to and from the motor, and a cooling unit that cools the power storage device, and the cooling unit stores the power storage device therein. A case with a sealed structure in which a flow path through which air for cooling the power storage device is circulated is formed; a blower device that is provided in the case and circulates the air in the case along the flow path; provided in the casing, has a temperature adjustment heat exchanger air circulating in the casing is cooled, the flow path between the wall of the case together with partitioning in the case up and down The partition wall for forming is provided, wherein the air is configured so that the circulation around the front Symbol partition wall in the vertical direction by the blower, wherein the power storage device is disposed on the lower side than the partition wall, said temperature is characterized in that the heat exchanger for regulating arranged on the upper side of the lower side of the partition wall and the downstream side of the electric storage device in the direction of flow of air, or the partition wall.

  According to the present invention, since the power storage device is disposed below the partition wall, in addition to preventing water droplets from entering the power storage device, the center of gravity of the cooling unit can be lowered, and the hybrid construction machine operates. Is stable.

Further, the in the above structure, Ru provided with water droplets generated in the heat exchanger for temperature control when cooling the air in the casing, a drain for discharging the water droplets striking the wall of the casing to the bottom of the case Is preferred .

According to the above configuration , since the drain is provided, even when moisture is accumulated in the case, the moisture can be discharged without removing various devices in the case. In particular, it is desirable to avoid removing the case as much as possible in a poor working environment. However, since the drain is provided in the above configuration , a large-scale work such as removing the case to remove moisture is unnecessary.

In the above configuration, it is preferable that the air blower be installed at a position until the air that has cooled the power storage device flows through the flow path and reaches the temperature adjustment heat exchanger.

According to the said structure , since the air before being cooled with the heat exchanger for temperature control can be sent out by an air blower, there exists an advantage that a water droplet does not adhere to an air blower.

  Further, in the above configuration, the present invention provides a refrigeration cycle circuit that performs air conditioning in the cab, an equipment cooling circuit that is connected to the temperature control heat exchanger and cools the inside of the case, the refrigeration cycle circuit, and the An intermediate heat exchanger that exchanges heat with the equipment cooling circuit, a prime mover cooling circuit that cools the prime mover, a connection circuit that connects the equipment cooling circuit and the prime mover cooling circuit, and opens and closes the connection circuit And a control valve.

  ADVANTAGE OF THE INVENTION According to this invention, the heat of each circuit can be used effectively and energy efficiency can be improved.

  Further, in the above configuration, the present invention heats the air in the case by opening the control valve and introducing the heat medium flowing through the prime mover cooling circuit to the equipment cooling circuit via the connection circuit. A warm-up operation mode is provided.

  According to the present invention, since the air in the case can be heated by effectively using the heat of the prime mover, an effect excellent in use in a cold district or the like is exhibited.

  ADVANTAGE OF THE INVENTION According to this invention, the hybrid type construction machine with which a water droplet cannot enter into an electrical storage apparatus easily can be provided. As a result, the power storage device mounted on the hybrid construction machine can be thermally protected, the reliability of the hybrid construction machine is improved, and the workability is improved. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a side view of a hybrid excavator according to an embodiment of the present invention. 1 is a system configuration diagram of an electric / hydraulic device mounted on a hybrid excavator according to an embodiment of the present invention. It is a schematic block diagram which shows the 1st Example of the apparatus temperature control apparatus mounted in the hybrid type hydraulic shovel which concerns on embodiment of this invention. It is a perspective view which shows the internal structure of the electrically-driven component cooling part shown in FIG. It is a figure which shows the operation state of the various apparatuses for every operation mode. It is a schematic block diagram which shows the 2nd Example of the apparatus temperature control apparatus mounted in the hybrid type hydraulic shovel which concerns on embodiment of this invention. It is a perspective view which shows the internal structure of the electrically-driven component cooling part shown in FIG. It is a schematic block diagram which shows the 3rd Example of the apparatus temperature control apparatus mounted in the hybrid type hydraulic shovel which concerns on embodiment of this invention. It is a schematic block diagram which shows the 4th Example of the apparatus temperature control apparatus mounted in the hybrid type hydraulic shovel which concerns on embodiment of this invention. It is a schematic block diagram which shows the 5th Example of the apparatus temperature control apparatus mounted in the hybrid type hydraulic shovel which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking a hybrid hydraulic excavator as an example of a hybrid construction machine. FIG. 1 is a side view of a hybrid hydraulic excavator according to an embodiment of the present invention, and FIG. 2 is a system configuration diagram of electric / hydraulic equipment mounted on the hybrid hydraulic excavator according to an embodiment of the present invention.

  In FIG. 1, a hybrid hydraulic excavator includes a traveling body 100, a revolving body 110 provided on the traveling body 100 so as to be able to swivel, an excavator mechanism 70, and an operating device 4 for operating the shovel mechanism 70 (see FIG. 2). ) In which the operator cab 3 is installed.

  The swivel body 110 includes a swivel frame 111, a driver's cab 3 provided in the front part on the swivel frame 111, an engine (prime mover) 1 provided in a prime mover room 112 on the rear part on the swivel frame 111, and an engine 1. Assist power generation motor 2 driven by the motor, inverter device 9 (see FIG. 2) connected to assist power generation motor 2, power storage device 8 and the like.

  In the following description, the assist generator motor 2 including the inverter device 9 is referred to as the electric motors 2 and 9 as appropriate. The electric motors 2 and 9 correspond to the electric motors in the present invention.

  Further, an excavator mechanism (working machine) 70 is mounted on the revolving structure 110. The shovel mechanism 70 includes a boom 71, a boom cylinder 72 for driving the boom 71, an arm 73 pivotally supported near the tip of the boom 71, and an arm cylinder 74 for driving the arm 73. A bucket 75 rotatably supported at the tip of the arm 73, a bucket cylinder 76 for driving the bucket 75, and the like.

  Further, a hydraulic system 90 for driving the hydraulic actuators such as the boom cylinder 72, the arm cylinder 74, and the bucket cylinder 76 described above is disposed in the prime mover chamber 112 of the swing body 110. The hydraulic system 90 includes a hydraulic pump 5 that serves as a hydraulic source that generates hydraulic pressure, a pilot hydraulic pump 6 that generates pilot pressure oil (see FIG. 2), and an operation device 4 that enables a desired operation of each hydraulic actuator ( The hydraulic pump 5 and the pilot hydraulic pump 6 are driven by the engine 1 while receiving the assistance of the assist power generation motor 2 as necessary (see FIG. 2). In the cab 3, an indoor air conditioning unit 41 (see FIG. 3), which will be described later, is disposed.

  Next, the system configuration of the electric / hydraulic equipment of the hybrid hydraulic excavator will be outlined. As shown in FIG. 2, the electric / hydraulic equipment system includes an engine 1, a governor 7 that adjusts the fuel injection amount of the engine 1, a rotational speed sensor 1 a that detects the actual rotational speed of the engine 1, and the torque of the engine 1. The engine torque sensor 1b for detecting the pressure, the hydraulic pump 5 and the pilot hydraulic pump 6 driven by the engine 1, the hydraulic actuators 72, 74, 76 driven by the pressure oil discharged from the hydraulic pump 5, and the hydraulic pressures A valve device 12 having a plurality of control valves for controlling the flow rate and direction of pressure oil to the actuators 72, 74, 76, and pilot hydraulic oil to be supplied to the valve device 12 is output to output each hydraulic actuator 72, 74, 76 Torque transmission between the operating device 4 enabling the desired operation of the engine 1 and the engine 1 disposed on the drive shaft of the engine 1. An assist power generation motor 2 that performs power, a power storage device 8 that supplies power to the assist power generation motor 2, and an inverter device 9 that controls the number of rotations of the assist power generation motor 2 and transfers power to and from the power storage device 8 as necessary. A pump capacity adjusting device 10 that adjusts the capacity of the hydraulic pump 5, a controller 11 that controls the engine speed by adjusting the governor 7 and controls the torque of the assist power generation motor 2 by controlling the inverter device 9; It has.

  The pressure oil discharged from the hydraulic pump 5 is supplied to the valve device 12. The pilot pressure oil discharged from the pilot hydraulic pump 6 is supplied to the operating device 4. By operating the operation lever by the operator, the operation device 4 outputs a predetermined pilot oil pressure, and this pilot oil pressure is transmitted to the operation portion of the valve device 12 through the pilot pipe line P. Further, the operation amount and the like of the operation device 4 are taken into the controller 11.

  The pilot oil pressure transmitted to the operation unit of the valve device 12 switches the spool position of a predetermined control valve. Thus, the pressure oil from the hydraulic pump 5 supplied to the valve device 12 is supplied to predetermined hydraulic actuators 72, 74, 76 after appropriately changing the flow rate, direction, and pressure. 76 is driven and controlled.

  The hydraulic pump 5 has, for example, a swash plate as a variable displacement mechanism, and controls the discharge flow rate of the pressure oil by adjusting the inclination angle of the swash plate. Hereinafter, although the hydraulic pump 5 will be described as a swash plate pump, a slant shaft pump or the like may be used as long as the same effect can be obtained. As for the load of the hydraulic pump 5, the controller 11 measures the inclination angle of the swash plate of the hydraulic pump 5 and a discharge pressure sensor, a flow meter (not shown) that measures the pressure and flow rate of the pressure oil discharged from the hydraulic pump 5. It is obtained by taking and calculating each output value of an inclination angle sensor (not shown).

  The pump capacity adjusting device 10 adjusts the capacity (displacement volume) of the hydraulic pump 5 based on an operation signal output from the controller 11, and includes a regulator 13 and an electromagnetic proportional valve 14. The regulator 13 is provided in the hydraulic pump 5. When the inclination angle of the swash plate of the hydraulic pump 5 is operated by the regulator 13, the capacity (displacement volume) of the hydraulic pump 5 is changed and the absorption torque (input) of the hydraulic pump 5 is input. Torque) can be controlled. The electromagnetic proportional valve 14 is controlled by a command value from the controller 11, and the operation amount of the regulator 13 is controlled by a control pressure generated by the electromagnetic proportional valve 14.

  A current sensor, a voltage sensor, and a temperature sensor (not shown) are attached to the power storage device 8 including a battery or a capacitor in order to calculate the amount of power stored in the power storage device 8. The controller 11 calculates the amount of power stored in the power storage device 8 based on information such as current, voltage, and temperature detected by these sensors, and manages the amount of power stored in the power storage device 8.

  In addition, the compressor 25 of the apparatus temperature adjusting device 20 (refer FIG. 3) mentioned later is connected to the drive shaft of the engine 1 via the clutch 25a. Further, an exhaust gas purification system is provided in the exhaust passage of the engine 1, and this exhaust gas purification system includes a selective catalytic reduction catalyst (SCR catalyst) 80, a reducing agent addition device 81, and a reducing agent. And a urea tank 82 for storing urea. The exhaust gas of the engine 1 is purified by a selective catalytic reduction catalyst (SCR catalyst) 80, and the nitrogen oxide in the exhaust gas is purified, and is discharged to the atmosphere through a muffler (silencer) 83.

  As described above, in the hybrid hydraulic excavator, the assist power generation motor 2 including the inverter device 9 as an electric motor that assists the power to the engine 1 and recovers the energy from the engine 1, and the power transfer between the assist power generation motor 2. And a power storage device 8 to perform. These electric motors 2 and 9 are provided with a cooling circuit for suppressing the temperature rise of each device, and an equipment cooling medium (cooling water) circulates inside the cooling circuit. The power storage device 8 is a so-called air-cooling type, and air of an appropriate temperature and air volume is allowed to flow through the power storage device 8 in order to keep it within a predetermined temperature range. The feature of this embodiment is that the power storage device 8 is provided with a device temperature adjusting device that blows air at an appropriate temperature. Hereinafter, various embodiments of the device temperature adjusting device will be described.

“First Example”
FIG. 3 is a schematic configuration diagram showing a first example of a device temperature adjusting device mounted on a hybrid hydraulic excavator according to an embodiment of the present invention. In the first embodiment, the power storage device 8 is referred to as an electric component 34, and an apparatus temperature adjusting device that adjusts the temperature of the electric component 34 will be described.

  In FIG. 3, the device temperature adjustment device 20 is connected to a refrigeration cycle circuit 21 in which a cooling medium for air conditioning such as refrigerant circulates in order to perform air conditioning inside the cab 3, and a temperature adjustment heat exchanger 152 in a case 151. Thus, between the refrigeration cycle circuit 21 and the electric component cooling circuit 22, the electric component cooling circuit (equipment cooling circuit) 22 in which an apparatus cooling medium such as cooling water circulates in order to cool the electric component 34 in the case 151. An intermediate heat exchanger 28 that performs heat exchange, an engine cooling circuit (primary motor cooling circuit) 23 in which an equipment cooling medium such as cooling water circulates to cool the engine 1, an engine cooling circuit 23, and an electric component cooling circuit 22 A connection circuit 170 for connecting the electric component 34, an electric component cooling unit (cooling unit) 150 for cooling the electric component 34, It is provided.

  The refrigeration cycle circuit 21 includes a liquid pipe through which an air conditioning cooling medium such as a refrigerant circulates, a compressor 25 that compresses the air conditioning cooling medium, and a first outdoor that performs heat exchange between the air conditioning cooling medium and outside air. A heat exchanger 26, an intermediate heat exchanger 28 for exchanging heat between the air conditioning cooling medium and the equipment cooling medium flowing in the electric component cooling circuit 22, and the air conditioning cooling medium and the air outside the cab or the air inside the cab 3 And an indoor cooling heat exchanger 30 for performing the heat exchange.

  The compressor 25 is driven by the power of the engine 1, and the drive / stop of the compressor 25 is performed by a clutch 25a (see FIG. 2) provided between the drive shafts of the compressor 25 and the engine 1. This is done by switching between fastening / release. The clutch 25a is engaged when the air conditioner performs a cooling operation or a heating operation and when the electric component 34 is cooled. The switching of the clutch 25a is performed by a command signal from a control device (not shown).

  One end of the suction pipe 32 is connected to the suction port of the compressor 25. The other end of the suction pipe 32 is connected to the other end of the liquid pipe whose one end is connected to the outflow side of the intermediate heat exchanger 28 and the liquid pipe whose one end is connected to the outflow side of the indoor cooling heat exchanger 30. The other end is connected. One end side of the discharge pipe 31 is connected to the discharge port of the compressor 25, and the other end side of the discharge pipe 31 is connected to the inflow side of the first outdoor heat exchanger 26.

  On the outflow side of the first outdoor heat exchanger 26, one end side is connected to the other end side of the liquid pipe whose one end side is connected to the inflow side of the intermediate heat exchanger 28 and the inflow side of the indoor cooling heat exchanger 30. The other end of the liquid pipe is connected. The liquid pipe connecting the outflow side of the first outdoor heat exchanger 26 and the inflow side of the intermediate heat exchanger 28 is provided with a first expansion valve 35A as a cooling flow control means. The liquid piping that connects the outflow side of the first outdoor heat exchanger 26 and the inflow side of the indoor cooling heat exchanger 30 is provided with a second expansion valve 35B that acts as a flow control means for air conditioning.

  In the refrigeration cycle circuit 21, the first outdoor heat exchanger 26 functions as a condenser, and the indoor cooling heat exchanger 30 and the intermediate heat exchanger 28 function as an evaporator. The first outdoor heat exchanger 26 includes a first outdoor fan 27 for blowing outside air.

  In the refrigeration cycle circuit 21 described above, the air conditioning cooling medium flowing through the intermediate heat exchanger 28 and the indoor cooling heat exchanger 30 is adjusted by adjusting the opening degrees of the first expansion valve 35A and the second expansion valve 35B, respectively. The amount can be distributed and the amount of heat exchange in the two heat exchangers 28, 30 can be individually controlled. Thus, since the cooling capacity in the intermediate heat exchanger 28 can be changed, it becomes possible to control the equipment cooling medium of the electric component cooling circuit 22 to a predetermined temperature.

  In addition, in this Embodiment mentioned above, although the example which has arrange | positioned the 1st outdoor fan 27 and the 2nd outdoor fan 39 separately separately is shown, it does not restrict to this. A part or all of the heat exchangers may be arranged as a common outdoor fan by devising the arrangement of the heat exchanger.

  The electric component cooling circuit 22 includes a liquid pipe through which an equipment cooling medium such as cooling water circulates, a first pump 29A that circulates the equipment cooling medium in the liquid pipe of the electric component cooling circuit 22, and an intermediate heat exchanger. 28 and a temperature-adjusting heat exchanger 152 that exchanges heat between the device cooling medium and the air flowing through the electric component 34 are sequentially connected in an annular manner by a liquid pipe.

  The liquid pipe connecting the intermediate heat exchanger 28 and the temperature adjustment heat exchanger 152 is provided with a temperature sensor such as a thermistor or a thermocouple for detecting the temperature of the equipment cooling medium. The temperature signal of the equipment cooling medium detected by the temperature sensor is output to a control device (not shown).

  The engine cooling circuit 23 includes a liquid pipe through which an equipment cooling medium such as cooling water circulates, an engine 1, a second outdoor heat exchanger 38 that performs heat exchange between the equipment cooling medium and outside air, and engine cooling. A second pump 29 </ b> B that circulates the equipment cooling medium in the liquid piping of the circuit 23 is sequentially connected in an annular shape by the liquid piping. The second outdoor heat exchanger 38 includes a second outdoor fan 39 for blowing outside air.

  Further, the other end side of the liquid pipe having one end connected to the inflow side of the indoor heating heat exchanger 40 that performs heat exchange between the equipment cooling medium and the operating room air is connected to the outflow side of the engine 1. Furthermore, the other end side of the liquid pipe whose one end side is connected to the outflow side of the indoor heating heat exchanger 40 is connected to the suction side of the second pump 29B.

  In other words, the engine cooling circuit 23 similarly causes the equipment cooling medium after cooling the engine 1 to flow into and out of the second outdoor heat exchanger 38 and the indoor heating heat exchanger 40 arranged in parallel. The device cooling medium after being circulated is circulated by the second pump 29B.

  The indoor air conditioning unit 41 installed inside the cab 3 (inside the cabin) and blowing out air that has been conditioned sucks in air outside the vehicle or inside the cab 3 and blows out the conditioned air into the cab 3. And an indoor cooling heat exchanger 30 and an indoor heating heat exchanger 40. Although details will be described later, the air sucked by the indoor fan 33 is heated or cooled by exchanging heat with an air conditioning cooling medium or an equipment cooling medium flowing in the indoor cooling heat exchanger 30 or the indoor heating heat exchanger 40. The The warmed or cooled air is blown out into the cab 3 to cool and cool the cab 3.

  FIG. 4 is a perspective view showing an internal configuration of the electric component cooling unit 150. As shown in FIG. 4, the electric component cooling unit (cooling unit) 150 includes an electric component 34, a temperature adjustment heat exchanger 152, an air circulation fan 153 as a blowing unit, the electric component 34, and temperature adjustment heat. It consists of the exchanger 152 and the case 151 of the airtight structure which accommodates the air circulation fan (blower) 153.

  Further, the case 151 is provided with a flat partition wall 160 so as to partition the inside thereof vertically, and the case 151 is formed between the partition wall 160 and the walls 151a, b, c, d of the case 151 as shown in FIG. A flow path 180 is formed so that air circulates up and down around the partition wall 160 in the order of the temperature adjustment heat exchanger 152, the electric component 34, and the air circulation fan 153 as indicated by the arrow 4. The electric component 34 is installed on the upper side of the partition wall 160, and the temperature control heat exchanger 152 and the air circulation fan 153 are formed on the lower side of the partition wall 160, and the return channel 154 of the channel 180 formed by the case 151. It is installed inside. In the following description, the walls 151a and 151c are called side walls, the wall 151b is called a ceiling, and the wall 151d is called a floor.

  As shown in FIGS. 3 and 4, on the partition wall 160, three power storage devices 8 that are the electric components 34 are installed in parallel in the vertical direction. Considering the cooling efficiency, it is better to arrange the electric components 34 in parallel rather than arranging them in series. In addition, it is desirable that a plurality of temperature control heat exchangers 152 and one air circulation fan 153 are provided for each of the plurality of power storage devices 8 from the viewpoint of low cost and space saving.

  By the way, the power storage device 8 provided in the hybrid construction machine needs to prevent foreign matters such as dust and water from being mixed in order to prevent damage. Since construction machines are generally used in places where there is a lot of dust, temperature-controlled air is circulated through the electric component cooling unit 150 of the present embodiment so as to prevent outside air from entering the case 151. That is, the case 151 has a sealed structure that blocks outside air. When the electric component 34 needs to be cooled, a temperature control heat exchanger 152 is provided to cool the circulating air in order to suppress the temperature rise of the air circulating in the case 151.

  Further, when the air circulating in the case 151 is cooled, water droplets are generated in the temperature adjustment heat exchanger 152. If this water droplet enters the electric component 34, it may be damaged as described above. In order to prevent breakage of the electric component 34, the temperature adjustment heat exchanger 152 is not provided at the same height as the electric component 34, but is installed in a return flow path 154 formed at a position lower than the electric component 34.

  The temperature adjusting heat exchanger 152 is installed on the downstream side of the air circulation fan 153 so that water droplets do not fly to the air circulation fan 153. Even if water droplets generated by the temperature control heat exchanger 152 fly, the water droplets fall on the side wall 151a by hitting the side wall 151a of the case 151. Further, in this embodiment, a return flow path 154 is formed below the electric component 34. With this configuration, the electric component cooling unit 150 according to the first embodiment can more reliably prevent water droplets from entering the electric component 34.

  In addition, the case 151 includes a drain 155 that discharges water droplets generated in the temperature adjustment heat exchanger 152 and water droplets that have hit the side wall 151a. The drain 155 is provided at a connection portion between the side wall 151a of the case 151 and the inclined portion 151d-1 inclined downward on the floor 151d. Therefore, the water droplet that has fallen along the side wall 151a and the water droplet that has fallen down along the inclined portion 151d-1 of the floor 151d are surely discharged through the drain 155. Considering the position of the drain 155, it is preferable to install the temperature adjustment heat exchanger 152 below the case 151. In order to prevent water droplets from entering the electric component 34 more reliably, a member that absorbs moisture, such as a filter, may be installed between the temperature adjustment heat exchanger 152 and the electric component 34.

  Here, the power storage device 8 such as a battery or a capacitor may be preferably warmed in advance in order to increase the charge / discharge efficiency at the start of the winter when the outside air temperature is low. In the present embodiment, in addition to cooling the electric component 34, the warm-up operation using the exhaust heat of the engine 1 can be performed. Specifically, as shown in FIG. 3, the electric component cooling circuit 22 and the engine cooling circuit 23 are connected via the connection circuit 170 including the first and second connection pipes 63A and 63B, and the equipment cooling medium is Both circuits are formed to be circulatable.

  In FIG. 3, the first connection pipe 63 </ b> A has one end connected to the liquid pipe on the inflow side of the electric component 34 of the electric component cooling circuit 22, and the other end connected to the second outdoor heat exchanger 38 of the engine cooling circuit 23. It is connected to the liquid piping on the inflow side. The second connection pipe 63B has one end connected to the liquid pipe on the outflow side of the electric component 34 of the electric component cooling circuit 22 and the other end connected to the outflow of the second outdoor heat exchanger 38 of the engine cooling circuit 23. It is connected to the liquid pipe on the side.

  The first communication pipe 63A constituting the connection circuit 170 is provided with a first two-way valve 64A as a control valve for opening and closing the circuit. Similarly, the second communication pipe 63B constituting the connection circuit 170 is provided with a circuit A second two-way valve 64B is provided as a control valve that opens and closes. A third two-way valve 64C as a control valve for opening and closing the circuit is provided between the inflow side of the second outdoor heat exchanger 38 of the engine cooling circuit 23 and the other end side of the first communication pipe 63A. It has been.

  Next, the operation | movement operation | movement of the apparatus temperature control apparatus 20 in 1st Example is demonstrated using FIG. The temperature of the engine 1 is adjusted by driving the second pump 29B of the engine cooling circuit 23 and circulating the equipment cooling medium through the second outdoor heat exchanger 38, the indoor heating heat exchanger 40, and the temperature adjusting heat exchanger 152. Do. The equipment cooling medium is cooled by air passing through the second outdoor heat exchanger 38, the indoor heating heat exchanger 40, and the temperature adjustment heat exchanger 152. Therefore, the cooling capacity can be adjusted by adjusting the air volume of the air sucked by the second outdoor fan 39, the indoor fan 33, and the air circulation fan 153.

  On the other hand, the temperature adjustment of the electric component 34 may be performed by cooling the equipment cooling medium circulating in the electric component cooling circuit 22 by the intermediate heat exchanger 28 or by the equipment cooling medium warmed by the engine 1. The operation of the device temperature adjustment device 20 varies depending on the operation status of the air conditioner in the cab and the air temperature sucked by the electric component 34. Therefore, the temperature adjustment of the operating room air conditioner and the electric component 34 in each operation mode of the air conditioner non-operation, the air conditioner cooling operation, the air conditioner heating operation, and the warm-up operation will be mainly described with reference to FIGS. To do. FIG. 5 is a diagram illustrating operation states of various devices for each operation mode.

Operation mode “Air-conditioner non-operation”:
The air conditioner non-operation is an operation mode in which the electric component 34 is cooled in a state where the air conditioning to the cab is not performed.

  The temperature adjustment of the electric component 34 is performed by driving the first pump 29 </ b> A of the electric component cooling circuit 22 and circulating the equipment cooling medium between the intermediate heat exchanger 28 and the temperature adjustment heat exchanger 152. This equipment cooling medium is cooled by the intermediate heat exchanger 28.

  The cooling of the equipment cooling medium in the intermediate heat exchanger 28 appropriately opens the first expansion valve 35A while the compressor 25 of the refrigeration cycle circuit 21 is driven. The second expansion valve 35B is fully closed. As the opening degree of the first expansion valve 35A is larger, the air-conditioning cooling medium flowing to the intermediate heat exchanger 28 increases, so that the cooling capacity in the intermediate heat exchanger 28 becomes higher.

  In the refrigeration cycle circuit 21, the air-conditioning cooling medium compressed by the compressor 25 is liquefied by releasing heat from the first outdoor heat exchanger 26, and then flows through the intermediate heat exchanger 28. The air conditioning cooling medium flowing to the intermediate heat exchanger 28 is reduced in pressure by the first expansion valve 35A to become low temperature and low pressure, and is evaporated by absorbing heat from the equipment cooling medium of the electric component cooling circuit 22 in the intermediate heat exchanger 28. Return to the compressor 25. In this way, by using the refrigeration cycle circuit 21, the intermediate heat exchanger 28 performs heat exchange between the equipment cooling medium and the air conditioning cooling medium, and the equipment cooling medium of the electric component cooling circuit 22 is cooled.

  The equipment cooling medium cooled by the intermediate heat exchanger 28 flows to the temperature adjustment heat exchanger 152. The air cooled by heat exchange in the temperature control heat exchanger 152 circulates in the case 151 of the electric component cooling unit 150 to cool the electric component 34.

  In order to control the temperature of the air circulating in the case 151, any one of the flow rate of the first pump 29A, the opening of the first expansion valve 35A, and the air volume of the first outdoor fan 27 may be adjusted. . Specifically, when the air circulating in the case 151 is higher than the target temperature, the flow rate of the first pump 29A, the opening degree of the first expansion valve 35A, and the air volume of the first outdoor fan 27 are increased. Any increase may be performed. Further, when the air circulating in the case 151 is lower than the target temperature, one of the flow rate of the first pump 29A is decreased, the opening degree of the first expansion valve 35A is decreased, and the air volume of the first outdoor fan 27 is decreased. Should be executed.

Operation mode “air-conditioner cooling operation”:
The air conditioner cooling operation is an operation mode in which the electric component 34 is cooled in a state where the inside of the cab 3 is cooled.

  The temperature adjustment of the electric component 34 is performed by driving the first pump 29A of the electric component cooling circuit 22 and circulating the device cooling medium between the intermediate heat exchanger 28 and the temperature adjustment heat exchanger 152. This equipment cooling medium is cooled by the intermediate heat exchanger 28.

  In the refrigeration cycle circuit 21, the air conditioning cooling medium compressed by the compressor 25 is liquefied by radiating heat from the first outdoor heat exchanger 26, and then flows through the intermediate heat exchanger 28 and the indoor cooling heat exchanger 30. The air conditioning cooling medium flowing to the intermediate heat exchanger 28 is reduced in pressure by the first expansion valve 35A to become low temperature and low pressure, and is evaporated by absorbing heat from the equipment cooling medium of the electric component cooling circuit 22 in the intermediate heat exchanger 28. Return to the compressor 25. Thus, heat exchange between the equipment cooling medium and the air conditioning cooling medium is performed in the intermediate heat exchanger 28, and the equipment cooling medium of the electric component cooling circuit 22 is cooled.

  The equipment cooling medium cooled by the intermediate heat exchanger 28 flows to the temperature adjustment heat exchanger 152. The air cooled by heat exchange in the temperature control heat exchanger 152 circulates in the case 151 of the electric component cooling unit 150 to cool the electric component 34.

  On the other hand, the cooling medium for air conditioning flowing through the indoor cooling heat exchanger 30 is reduced in pressure by the second expansion valve 35B to become low temperature and low pressure, and is evaporated by absorbing heat from the air sucked by the indoor fan 33 in the indoor cooling heat exchanger 30. The process returns to the compressor 25. Thus, the air cooled and exchanged by the indoor cooling heat exchanger 30 is controlled to an appropriate air temperature via the indoor heating heat exchanger 40 of the indoor air conditioning unit 41 and blown out into the cab 3. Is done.

  In this operation mode, since both the intermediate heat exchanger 28 and the indoor cooling heat exchanger 30 can be used as an evaporator, cooling inside the operation room 3 and cooling of the electric component 34 can be realized simultaneously. Further, the intermediate heat exchanger 28 and the indoor cooling heat exchanger 30 are connected in parallel to the suction pipe 32 of the compressor 25, and a first expansion valve 35A and a second expansion valve 35B are provided on each inflow side. Therefore, the flow rates of the air-conditioning cooling medium flowing to the intermediate heat exchanger 28 and the indoor cooling heat exchanger 30 can be arbitrarily changed. As a result, the temperature of the equipment cooling medium and the temperature of the air conditioning cooling medium can be controlled to any desired temperatures.

  Therefore, even when the temperature of the air conditioning cooling medium is sufficiently lowered to cool the cab 3, the heat exchange for temperature control is performed by suppressing the flow rate of the air conditioning cooling medium flowing to the intermediate heat exchanger 28. The temperature of the equipment cooling medium flowing through the vessel 152 can be maintained at a constant temperature without being excessively lowered.

  In order to control the temperature of the air circulating in the case 151 and the temperature of the air blown from the indoor air conditioning unit 41, the flow rate of the first pump 29A, the opening degrees of the first expansion valve 35A and the second expansion valve 35B, and the first Any one of the air volumes of the outdoor fans 27 may be adjusted.

  Specifically, when the air circulating in the case 151 is higher than the target temperature, the flow rate of the first pump 29A is increased, the opening degree of the first expansion valve 35A is increased, or the rotation of the first outdoor fan 27 is rotated. What is necessary is just to perform at least one of the increase of a number. When the temperature of the air blown into the cab 3 is higher than the target temperature, at least one of increasing the opening of the second expansion valve 35B or increasing the rotation speed of the first outdoor fan 27 may be executed.

  When the air circulating in the case 151 is lower than the target temperature, the flow rate of the first pump 29A is decreased, the opening degree of the first expansion valve 35A is decreased, or the rotation speed of the first outdoor fan 27 is decreased. Execute at least one of the following. When the temperature of the air blown into the cab 3 is lower than the target temperature, at least one of the reduction of the opening of the second expansion valve 35B or the reduction of the rotation speed of the first outdoor fan 27 may be executed.

Operation mode “Air-conditioner heating operation”:
The air conditioner heating operation is an operation mode in which the electric component 34 is cooled while the inside of the cab 3 is heated.

  In the refrigeration cycle circuit 21, the air conditioning cooling medium compressed by the compressor 25 is liquefied by radiating heat from the first outdoor heat exchanger 26, and then flows through the intermediate heat exchanger 28 and the indoor cooling heat exchanger 30. The air conditioning cooling medium flowing to the intermediate heat exchanger 28 is reduced in pressure by the first expansion valve 35A to become low temperature and low pressure, and is evaporated by absorbing heat from the equipment cooling medium of the electric component cooling circuit 22 in the intermediate heat exchanger 28. Return to the compressor 25. Thus, heat exchange between the equipment cooling medium and the air conditioning cooling medium is performed in the intermediate heat exchanger 28, and the equipment cooling medium of the electric component cooling circuit 22 is cooled.

  The equipment cooling medium cooled by the intermediate heat exchanger 28 flows to the temperature adjustment heat exchanger 152. The air cooled by heat exchange in the temperature control heat exchanger 152 circulates in the case 151 of the electric component cooling unit 150 to cool the electric component 34.

  On the other hand, the cooling medium for air conditioning flowing through the indoor cooling heat exchanger 30 is reduced in pressure by the second expansion valve 35B to become low temperature and low pressure, and is evaporated by absorbing heat from the air sucked by the indoor fan 33 in the indoor cooling heat exchanger 30. The process returns to the compressor 25. Thus, the air cooled and dehumidified by heat exchange in the indoor cooling heat exchanger 30 is heated by the indoor heating heat exchanger 40 through which the equipment cooling medium heated by the exhaust heat of the engine 1 of the engine cooling circuit 23 flows. Then, it is blown out into the cab 3. Further, the temperature adjustment of the electric component 34 in the electric component cooling circuit 22 is the same as that in the air-conditioner cooling operation, and thus the description thereof is omitted.

  Note that the first and second two-way valves 64A and 64B of the device temperature adjusting device 20 are closed in the air conditioning apparatus non-operation, the air conditioning apparatus cooling operation, and the air conditioning apparatus heating operation that do not require the warm-up operation of the electric component 34. Then, the third two-way valve 64C is opened. In this case, the device cooling medium does not circulate in the first and second connection pipes 63A and 63B, and the electric component cooling circuit 22 and the engine cooling circuit 23 can independently cool the electric component 34 and the engine 1, respectively. it can.

Operation mode “warm-up operation”:
Next, warm-up operation will be described. This is an operation mode in which the electric component 34 is warmed. This warm-up operation is an operation mode used particularly in cold regions. Since the operation of the refrigeration cycle circuit 21 by driving the air conditioner is the same as described above, the description thereof is omitted.

  When the warm-up operation is performed, the first and second two-way valves 64A and 64B of the device temperature adjusting device 20 are opened, and the third two-way valve 64C is closed. In this case, the equipment cooling medium circulates through the first and second communication pipes 63 </ b> A and 63 </ b> B, and the equipment cooling medium warmed by the engine 1 circulates through the temperature adjustment heat exchanger 152. The air heated by exchanging heat in the temperature adjustment heat exchanger 152 circulates in the case 151 of the electric component cooling unit 150, and the electric component 34 is heated. At this time, the first pump 29A is stopped, and heat exchange in the intermediate heat exchanger 28 is not performed.

  As described above, according to the hybrid hydraulic excavator provided with the device temperature adjustment device 20 according to the first embodiment, water droplets generated when the air to be blown to the power storage device 8 is cooled by the temperature adjustment heat exchanger 152. The temperature of the power storage device 8 can be adjusted efficiently without being stored in the power storage device 8. As a result, the power storage device mounted on the hybrid construction machine can be thermally protected, the reliability of the hybrid construction machine is improved, and the workability is improved. Further, in the warm-up operation mode, the engine exhaust heat can be used, so that the heat energy can be effectively used.

"Second Example"
FIG. 6 is a schematic configuration diagram showing a second example of the equipment temperature adjusting device mounted on the hybrid hydraulic excavator according to the embodiment of the present invention, and FIG. 7 is a perspective view showing the internal configuration of the electric component cooling unit shown in FIG. FIG. 6 and 7, the same reference numerals as those shown in FIGS. 1 to 5 are the same parts, and the detailed description thereof will be omitted.

  The apparatus temperature control apparatus according to the second embodiment shown in FIGS. 6 and 7 is generally composed of the same apparatus as in the first embodiment, but the configuration of the electric component cooling unit is different.

  In the electric component cooling unit 250 in the second embodiment, the electric component 34, the temperature adjustment heat exchanger 152, and the air circulation fan 153 are arranged below the partition wall 160, and the positional relationship thereof is set in the air flow direction. A difference from the first embodiment is that the electric component 34, the air circulation fan 153, and the temperature adjustment heat exchanger 152 are arranged in this order from the upstream side, and that the direction of the air flowing through the flow path 180 is opposite. To do. In the second embodiment, by arranging the electric component 34, the temperature adjustment heat exchanger 152, and the air circulation fan 153 below the partition wall 160, it is possible to reduce the center of gravity and save space of the electric component cooling unit 250. .

  The electric component cooling unit 250 shown in FIGS. 6 and 7 arranges the air circulation fan 153 and the temperature adjustment heat exchanger 152 in a straight line on the downstream side of the electric component 34, and sets the return flow path 154 to the electric component 34 and temperature adjustment. It is formed above the heat exchanger 152 and the air circulation fan 153. In addition, the case 151 includes a drain 155 that discharges water droplets generated by the temperature control heat exchanger 152 and water droplets that have hit the side wall 151a. Therefore, the water droplet that has fallen along the side wall 151a and the water droplet that has fallen down along the inclined portion 151d-1 of the floor 151d are surely discharged through the drain 155.

  According to the second embodiment described above, the same effects as in the first embodiment described above can be obtained. Further, in the second embodiment, the center of gravity can be lowered by installing the electric component 34, which is a heavy object in the electric component cooling unit 250, the heat exchanger 152 for temperature control, and the air circulation fan 153 downward. Stabilize the attitude of the hybrid hydraulic excavator. Further, since the temperature control heat exchanger 152 and the air circulation fan 153 are not provided in the return flow path 154, the height dimension of the return flow path 154 can be reduced, and the height dimension of the electric component cooling unit 250 can be reduced.

  Note that the first embodiment or the second embodiment may be appropriately selected depending on the layout restrictions of the hybrid hydraulic excavator. That is, when there is a restriction on the height dimension, the second embodiment is selected, and when there is a restriction on the width dimension, the first embodiment may be selected.

“Third Example”
FIG. 8 is a schematic configuration diagram showing a third example of the equipment temperature adjusting device mounted on the hybrid hydraulic excavator according to the embodiment of the present invention. In FIG. 8, the same reference numerals as those shown in FIG. 1 to FIG.

  The electric component cooling section 350 in the third embodiment shown in FIG. 8 is different from the second embodiment in that the temperature adjusting heat exchanger 152 and the air circulation fan 153 are arranged on the upper side of the partition wall 160, that is, in the return flow path 154. Is different. According to the third embodiment configured as described above, since the electric component 34 is disposed below the partition wall 160, the center of gravity is lowered. In addition, since the temperature adjustment heat exchanger 152 and the air circulation fan 153 are disposed above the partition wall 160, the width of the electric component cooling unit 350 can be reduced.

“Fourth Example”
FIG. 9 is a schematic configuration diagram showing a fourth example of the equipment temperature adjusting device mounted on the hybrid hydraulic excavator according to the embodiment of the present invention. In FIG. 9, the same reference numerals as those shown in FIGS. 1 to 8 are the same parts, and detailed description thereof is omitted.

  The apparatus temperature control apparatus according to the fourth embodiment shown in FIG. 9 is generally composed of the same apparatus as in the first embodiment, except that the electric component 34 is not warmed up. That is, the fourth embodiment is different from the first embodiment in that the connection circuit 170 is not provided. According to this configuration, since the connection circuit 170 is not provided, the number of parts can be reduced and the cost can be reduced. The fourth embodiment is particularly suitable when use in a cold region or the like is not required.

"5th Example"
FIG. 10 is a schematic configuration diagram showing a fifth example of the equipment temperature adjusting device mounted on the hybrid hydraulic excavator according to the embodiment of the present invention. In FIG. 10, the same reference numerals as those shown in FIG. 1 to FIG. 9 are the same parts, and detailed description thereof will be omitted.

  The apparatus temperature control apparatus according to the fifth embodiment shown in FIG. 10 is generally composed of the same apparatus as in the second embodiment, except that the electric component 34 is not warmed up. That is, the fifth embodiment is different from the second embodiment in that the connection circuit 170 is not provided. According to this configuration, since the connection circuit 170 is not provided, the number of parts can be reduced and the cost can be reduced. The fifth embodiment is particularly suitable when use in a cold district or the like is not required.

  As described above, according to each embodiment, even when water drops are included in the air circulating in the case 151, the water drops are separated when the air hits the side wall 151a. Air is not directly introduced into the motorized component 34. Therefore, the trouble that the electric component 34 is damaged by water droplets can be prevented. As a result, the reliability of the hybrid hydraulic excavator is improved and workability is also improved. Further, in the hybrid hydraulic excavator equipped with the device temperature adjusting device according to the first to third embodiments, the electric component cooling unit can be warmed using the engine exhaust heat, so that it can be used even in a cold region. it can.

  The embodiments of the hybrid excavator and the examples of the device temperature adjustment device described above are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention. Further, the present invention is applicable not only to hybrid construction machines but also to hybrid vehicles.

1 engine (motor)
2 Assist generator motor (electric motor)
3 cab 4 operating device 8 power storage device 9 inverter device (motor)
20 Equipment temperature control device 21 Refrigeration cycle circuit 22 Electric component cooling circuit (equipment cooling circuit)
23 Engine cooling circuit (motor cooling circuit)
28 Intermediate heat exchanger 34 Electric component (power storage device)
63A First communication pipe 63B Second communication pipe 64A First two-way valve (control valve)
64B Second two-way valve (control valve)
70 Excavator mechanism (work machine)
150 Electric component cooling unit (cooling unit)
151 Case 151a, b, c, d Wall 152 Temperature control heat exchanger 153 Air circulation fan (blower)
155 Drain 160 Partition wall 170 Connection circuit 180 Flow path 250, 350 Electric component cooling unit (cooling unit)

Claims (4)

Between the prime mover, a working machine that will be driven by the prime mover, the cab operation apparatus is installed in the working machine, an electric motor performing the energy recovery from the power assist and the prime mover to the prime mover, and the electric motor A power storage device that transmits and receives power at a cooling unit for cooling the power storage device,
The cooling unit is
Said power storage device is a sealed structure is not Ru passage circulating air is formed for cooling the by Rutotomoni said power storage device housed inside the case,
A blower that is provided in the case and circulates the air in the case along the flow path;
Provided in the casing, has a temperature adjustment heat exchanger for cooling air circulating in said case,
A partition wall for partitioning the inside of the case up and down and forming the flow path between the case wall and the air is circulated around the partition wall in the vertical direction by the blower. Configured,
The hybrid construction machine, wherein the power storage device is disposed above the partition wall, and the temperature control heat exchanger is disposed below the partition wall. A motor, a working machine driven by the motor, a driver's cab in which an operating device for the working machine is installed, a motor for assisting power to the motor and recovering energy from the motor, and the motor. A power storage device that transmits and receives power at a cooling unit for cooling the power storage device,
The cooling unit is
A case of a sealed structure in which a flow path through which air for cooling the power storage device is circulated is formed while the power storage device is housed inside;
A blower that is provided in the case and circulates the air in the case along the flow path;
A temperature control heat exchanger that is provided in the case and in which the air circulating in the case is cooled,
Before Symbol partition wall for forming said flow path between the wall of the casing with partitions the inside of the case up and down is provided, air Ru is circulated around the front Symbol partition wall in the vertical direction by the blower Configured as
Said power storage device is disposed on the lower side than the partition wall, the temperature adjustment heat exchanger is arranged on the upper side of the lower side of the partition wall and the downstream side of the electric storage device in the direction of flow of air, or the partition wall A hybrid construction machine characterized by that. In claim 1 or 2 ,
A refrigeration cycle circuit for air conditioning the cab;
An equipment cooling circuit connected to the temperature control heat exchanger to cool the inside of the case;
An intermediate heat exchanger that exchanges heat between the refrigeration cycle circuit and the equipment cooling circuit;
A prime mover cooling circuit for cooling the prime mover;
A connection circuit connecting the equipment cooling circuit and the prime mover cooling circuit;
A hybrid construction machine comprising a control valve for opening and closing the connection circuit. In claim 3 ,
Open the control valve, the Rukoto heat medium flowing through the motor cooling circuit is introduced into the device cooling circuit via said connection circuit, comprise a warm-up operation mode in which air is Ru is heated within the casing A hybrid construction machine characterized by