JP2004278716A - Waste heat energy regenerating method and waste heat energy regenerating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve inefficient property in use of power source energy. <P>SOLUTION: An oil cooler 16 for cooling operating fluid increased in temperature by energy loss of a hydraulic circuit 25 is installed in an operating fluid return circuit 26 of the hydraulic circuit 25 including a main pump 12 for feeding operating fluid actuated by an engine 11. The engine 11 is provided with a turbine 24 for power regeneration rotated by the energy possessed by vaporized low boiling point medium. A low boiling point medium circuit 38 for supplying the low boiling point medium vaporized by waste heat energy from the oil cooler 16 to drive the turbine 24 is disposed at least from the oil cooler 16 to the turbine 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waste heat energy regeneration method and a waste heat energy regeneration device for regenerating waste heat energy of a working fluid generated from a hydraulic circuit.
[0002]
[Prior art]
In current construction machines, power is supplied to a main pump from a diesel engine, which is a power source, and pressure oil is supplied to a control valve for an actuator from the main pump.
[0003]
Further, the actuator supplied with pressure oil from the actuator control valve performs a certain amount of net work to the outside, but other energy is consumed by various relief valves, throttles in the control valve, and pipe resistance loss. And dissipates into the air as heat energy.
[0004]
In addition, the temperature of the hydraulic oil also rises, which causes thermal deterioration and viscosity decrease of the oil, causing damage to hydraulic equipment.Therefore, the temperature of the hydraulic oil is lowered by an oil cooler. Further power must be supplied (for example, see Patent Document 1).
[0005]
This conventional technique will be described with reference to FIG. 2. Discharge oil of a main pump 12 driven by a diesel engine 11 serving as a power source is supplied as pressure oil to a control valve 13 via a check valve 12a. The actuator 14 to which the pressure oil is supplied via the pipe 14a performs a certain fixed amount of net work to the outside, but the other energy is generated by the heat generated by the actuator 14 and the throttle in the relief valve 15 and the control valve 13. Heat energy is generated by energy loss due to R1 and pipe resistance R2 in the pipe line 14a, etc., and most of the heat energy is dissipated in a manner to raise the temperature of the hydraulic oil.
[0006]
A rise in the temperature of the hydraulic oil causes thermal deterioration and a decrease in viscosity of the hydraulic oil, and damages the hydraulic equipment. Therefore, the cooling fins of the oil cooler 16 are air-cooled by a cooling fan 18 driven by an external oil cooler motor 17. In order to drive the oil cooler motor 17, an oil cooler pump 19 which is gear-driven by the engine 11 is installed, and pressure oil is supplied from the oil cooler pump 19 to the oil cooler motor 17. Since the power is supplied, the engine 11 must additionally supply another power in addition to the main pump 12.
[0007]
[Patent Document 1]
JP 2000-257608 A (page 3, FIG. 2)
[0008]
[Problems to be solved by the invention]
Therefore, there is a problem that the power loss of the engine 11 as a power source is large and the efficiency of using the power source energy is poor.
[0009]
The present invention has been made in view of such a point, and an object of the present invention is to improve inefficiency of power source energy utilization.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, waste heat energy of a working fluid generated from a fluid pressure circuit including a pump driven by a power source is absorbed by using a low-boiling medium, and the absorbed low-boiling medium is vaporized. This is a waste heat energy regeneration method that regenerates waste heat energy by rotating a turbine for power regeneration and assisting the power source with the turbine to regenerate waste heat energy. The waste heat energy of the working fluid generated from the fluid pressure circuit is absorbed and steam is absorbed. The turbine is rotated by the converted low-boiling medium, and the turbine assists the power source to regenerate waste heat energy. Therefore, the power loss of the power source wasted and wasted to the air as waste heat energy of the fluid pressure circuit. Can be regenerated to the power source via the turbine, and the efficiency of power source energy utilization can be improved.
[0011]
According to a second aspect of the present invention, there is provided a hydraulic circuit including a pump for supplying a working fluid driven by a power source, a cooler for cooling a working fluid whose temperature rises due to energy loss of the hydraulic circuit, and a power source. A turbine for power regeneration, which is provided to be rotated with the energy of the vaporized low-boiling medium, and a low-boiling medium which is disposed at least from the cooler to the turbine and is vaporized with waste heat energy from the cooler. And a low-boiling-point medium circuit that drives the turbine by supplying the high-temperature working fluid returned to the cooler after a temperature rise in a fluid pressure circuit including a pump driven by a power source. The low-boiling medium vaporized by the waste heat energy is supplied by a low-boiling medium circuit to a power regeneration turbine provided for a power source, and this turbine is Since the power source operates, a part of the power loss of the power source that was wasted to the air as waste heat energy from the cooler can be partially regenerated to the power source by the low-boiling-point medium circuit and the turbine, and the efficiency of power source energy utilization can be improved. .
[0012]
According to a third aspect of the present invention, in the waste heat energy regenerating apparatus according to the second aspect, the low boiling point medium circuit is supplied to an evaporator of an air conditioner circuit having a compressor and an evaporator mounted on a construction machine. A heat pipe that absorbs heat from the cooler to vaporize the low-boiling medium by diverting part of the low-boiling medium that is passed through the cooler, and a low-boiling medium vaporized in the heat pipe to the turbine. An air conditioner equipped with a supply line and a return line for returning a low-boiling medium from a turbine to a suction side of a compressor of an air conditioner circuit. Part of the low-boiling medium supplied to the evaporator of the circuit is diverted and passed through the heat pipe in the cooler to absorb waste heat energy from the cooler to vaporize the low-boiling medium and vaporize in the heat pipe Sa The low-boiling medium is supplied to the turbine through a supply line, and the low-boiling medium from the turbine is returned to the suction side of the compressor of the air-conditioning circuit by a return line. By effectively utilizing a part of the heat pipe, additional heat pipes, supply pipes, and return pipes, the low boiling point medium circuit can be configured at low cost, and the low boiling point medium is disposed of by the high temperature working fluid of the cooler. By vaporizing with heat energy, heat is taken from the high-temperature working fluid to lower the working fluid temperature, and the power source recovers waste heat energy through the turbine driven by the vaporized low-boiling medium, The conventional expensive hydraulic motor for driving the cooling fan can be omitted, and the cost can be reduced. Further, there is no power loss when driving the cooler pump for rotating the fluid pressure motor for driving the cooling fan, which is economical.
[0013]
According to a fourth aspect of the present invention, in the waste heat energy regenerating apparatus according to the second or third aspect, the turbine is a waste heat energy installed in a power transmission system branched from a power transmission unit that drives a pump. An energy regenerating device, in which a power source utilizes a power transmission system branched from a power transmission unit that drives a pump, so that a turbine can be easily installed, and a low boiling point vaporized by waste heat energy from a cooler. By regenerating the drive torque generated in the turbine by the medium to the power source via the power transmission system, the pump drive power of the power source can be reduced, the energy consumption of the power source can be reduced, and the fluid pressure circuit generates The effective regeneration and recovery of the lost heat energy is made possible.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG. The same parts as those of the prior art shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.
[0015]
As shown in FIG. 1, a drive shaft unit 21 as a power transmission unit that drives a main pump 12 as a pump with a diesel engine (hereinafter simply referred to as “engine”) 11 as a power source of a construction machine such as a hydraulic shovel. The shaft 23 of the engine gear portion 22 as a power transmission system branched from is rotated by the energy of a vaporized low boiling point medium (so-called refrigerant) instead of the conventional oil cooler pump 19 (FIG. 2). A small power regeneration steam turbine (hereinafter simply referred to as “turbine”) 24 is connected to the engine 11 and installed therein.
[0016]
As a result of the hydraulic energy loss of the hydraulic circuit 25 as the fluid pressure circuit including the main pump 12, the heat energy of the hydraulic oil as the working fluid whose temperature has risen is mostly changed to the oil cooler as the cooler installed in the hydraulic oil return circuit 26. 16, the oil cooler 16 cools the hydraulic oil whose temperature has increased due to energy loss of the hydraulic circuit 25.
[0017]
On the other hand, a normal air conditioner mounted on a construction machine such as a hydraulic shovel (hereinafter, this air conditioner is referred to as an “air conditioner”) includes a compressor (compressor) 32 driven by a motor 31 and a CFC substitute. A condenser (condenser) 33 for condensing the low-boiling medium by releasing heat from the low-boiling medium to the outside, a liquid receiver 35 for storing the condensed low-boiling medium 34, and a low-boiling medium 34 driven by the motor 31 Pump 36 for pumping pressure, an expansion valve (not shown) for reducing the pressure of the low-boiling medium, and an evaporator (evaporator, FIG. 11) for absorbing heat from the outside to the low-boiling medium vaporized via the expansion valve. (Not shown)) is provided with an air conditioner circuit 37 as an air conditioner circuit which is sequentially connected in an endless manner. Since this air conditioner circuit 37 is also installed in a conventional machine, it is also described in FIG. 2 (prior art).
[0018]
Utilizing the air conditioner circuit 37, a low-boiling medium vaporized by the waste heat energy from the oil cooler 16 is supplied to the turbine 24 at least from the oil cooler 16 to the turbine 24 to drive the turbine 24. A media circuit 38 is provided.
[0019]
The low boiling point medium circuit 38 absorbs heat from the oil cooler 16 by diverting a part of the low boiling point medium supplied to the evaporator of the air conditioner circuit 37 mounted on the construction machine and passing it through the oil cooler 16. A heat pipe 41 for evaporating the low-boiling medium to evaporate the low-boiling medium, a supply conduit 42 for supplying the low-boiling medium vaporized in the heat pipe 41 to the turbine 24, and a low-boiling medium from the turbine 24 to the air conditioner circuit 37. And a return line 43 returning to the suction side of the compressor 32.
[0020]
Next, the operation and effect of the embodiment shown in FIG. 1 will be described.
[0021]
A part of the condensed low boiling point medium 34 supplied from the low boiling point medium pump 36 to the evaporator of the air conditioner circuit 37 is diverted from the air conditioner circuit 37 and passed through a heat pipe 41 installed in the oil cooler 16, At this time, instead of air cooling by the conventional cooling fan 18 (FIG. 2), the heat generated by the hydraulic return oil is absorbed by the evaporation of the low-boiling medium (refrigerant) 34 to be cooled.
[0022]
That is, the low-boiling medium in the heat pipe 41 absorbs and vaporizes the heat energy of the hydraulic oil whose temperature has risen in the hydraulic circuit 25, and the vaporized low-boiling medium is supplied from the engine 11 to a part other than the main pump 12. Is supplied to a turbine 24 installed on a shaft 23 of an engine gear unit 22 for extracting drive power, and also cools a hydraulic oil of a hydraulic circuit 25 that has released heat energy to a low-boiling medium by a heat pipe 41.
[0023]
As described above, the engine gear portion 22 that drives the main pump by the engine 11 as a power source is provided with a small power regeneration driven by low-boiling-point medium steam instead of the conventional oil cooler pump 19 (FIG. 2). Is installed, the power loss for driving the oil cooler pump 19 for the engine 11 is reduced.
[0024]
In the hydraulic circuit 25 including the main pump 12, most of the heat energy generated as a result of hydraulic energy loss in the control valve 13, the relief valve 15, the piping, and the actuator 14 causes the temperature of the hydraulic oil to rise. The oil passes through the oil cooler 16 in the hydraulic oil return circuit 26, and diverts a low-boiling medium 34 such as chlorofluorocarbon, which is supplied to an evaporator of an air conditioner circuit 37 installed in the construction machine, from the air conditioner circuit 37. Since the heat pipe 41 for passing the low-boiling medium 34 is installed in the oil cooler 16, instead of the air cooling by the cooling fan 18 driven by the conventional oil cooler motor 17, the low-boiling medium operates at high temperature of the oil cooler 16. When evaporating with the thermal energy of oil, it removes heat from high-temperature hydraulic oil, lowers hydraulic oil temperature, and reduces thermal energy. It is possible to yield.
[0025]
The vaporized low-boiling medium is supplied to a turbine 24 installed in an engine gear section 22 where the main pump is driven by the engine 11, and the turbine 24 is driven by the low-boiling medium steam. The drive torque of the main pump of the engine 11 can be reduced by the drive torque thus applied, so that the engine fuel consumption can be reduced and the heat energy loss generated in the hydraulic circuit 25 can be effectively regenerated and recovered.
[0026]
In this way, the temperature rise heat energy of the hydraulic oil generated as a result of the energy loss of the hydraulic circuit 25 including the main pump 12 is absorbed by using the low boiling point medium, vaporized, and the turbine 24 is rotated. At 24, power assist of the engine 11 is performed, and energy regeneration is performed.
[0027]
As described above, instead of the oil cooler pump, instead of the oil cooler pump, the small power regeneration unit driven by the engine 11 which is the power source of the conventional construction machine for the main pump is used. And the low-boiling medium 34 supplied to the evaporator of the air-conditioning circuit 37 normally installed in the construction machine is diverted from the air-conditioning circuit 37, and the heat pipe 41 passing through the low-boiling medium 34 is supplied with oil. Since it is installed in the cooler 16, the low-boiling medium 34 is evaporated by the heat energy of the high-temperature hydraulic oil of the oil cooler 16 instead of the conventional air-cooling of the hydraulic motor drive fan, so that heat is taken from the hydraulic oil to lower the hydraulic oil temperature. At the same time, heat energy can be recovered. As a result, the conventional oil cooler motor 17 for driving the cooling fan, which is expensive, can be eliminated, and the cost can be reduced.
[0028]
Further, a part of the low-boiling-point medium supplied to the evaporator of the air conditioner circuit 37 mounted on the construction machine is diverted and passed through the heat pipe 41 in the oil cooler 16 so that the waste heat energy is The low-boiling medium vaporized by absorption is vaporized, and the low-boiling medium vaporized in the heat pipe 41 is supplied to the turbine 24 through the supply pipe 42, and the low-boiling medium from the turbine 24 is returned through the return pipe 43 to the air conditioning circuit. Since it is returned to the suction side of the compressor 32 of 37, a part of the air conditioner circuit 37 mounted on the construction machine is effectively used, and the heat pipe 41, the supply pipe 42, and the return pipe 43 are additionally installed. The low-boiling medium circuit 38 can be configured at low cost.
[0029]
Further, the turbine 24 can be easily installed by using the engine gear portion 22 as a power transmission system branched from the drive shaft portion 21 in which the engine 11 drives the main pump 12, and the turbine 24 can be easily installed in the heat pipe 41 of the oil cooler 16. The low-boiling medium vaporized is supplied to a turbine 24 installed in an engine gear section 22 where the engine 11 drives the main pump, and the driving torque generated in the turbine 24 by the low-boiling medium steam causes the main pump driving power of the engine 11 to be increased. Therefore, the engine fuel consumption can be reduced, and the heat energy loss generated in the hydraulic circuit 25 can be effectively regenerated and recovered.
[0030]
【The invention's effect】
According to the first aspect of the present invention, the turbine is rotated by the low-boiling medium vaporized by absorbing the waste heat energy of the working fluid generated from the fluid pressure circuit, and the turbine is used to assist the power source to generate waste heat. Since the energy is regenerated, part of the power loss of the power source that was wasted to the air as waste heat energy of the fluid pressure circuit can be regenerated to the power source via the turbine, and the efficiency of power source energy utilization can be improved. .
[0031]
According to the second aspect of the present invention, the low-boiling medium vaporized by waste heat energy of the high-temperature working fluid returned to the cooler by raising the temperature in the fluid pressure circuit including the pump driven by the power source, The low-boiling-point medium circuit supplies power to a power regeneration turbine provided for the power source to drive the turbine, so that the power loss of the power source wasted from the cooler and wasted to the air as waste heat energy. Part of the power can be regenerated to the power source by the low boiling point medium circuit and the turbine, and the efficiency of power source energy utilization can be improved.
[0032]
According to the third aspect of the present invention, a part of the low-boiling-point medium supplied to the evaporator of the air conditioner circuit mounted on the construction machine is partially diverted and passed through the heat pipe in the cooler, so that the waste is discharged from the cooler. Heat energy is absorbed to vaporize the low-boiling medium, the low-boiling medium vaporized in the heat pipe is supplied to the turbine through a supply pipe, and the low-boiling medium from the turbine is returned to the air-conditioning circuit through a pipe. Return to the suction side of the compressor, so that part of the air conditioner circuit mounted on the construction machine can be used effectively, and heat pipes, supply pipes, and return pipes are additionally installed to reduce the low boiling point medium. The circuit can be configured at a low cost, and the low-boiling medium is vaporized with waste heat energy of the high-temperature working fluid of the cooler, so that heat is taken from the high-temperature working fluid to lower the temperature of the working fluid. boiling point Since the power source through a driven turbine by the body to recover waste heat energy, conventional expensive hydraulic motor for the cooling fan drive can be eliminated, thereby cost reduction. Further, there is no power loss when driving the cooler pump for rotating the fluid pressure motor for driving the cooling fan, which is economical.
[0033]
According to the fourth aspect of the present invention, the turbine can be easily installed by using the power transmission system in which the power source is branched from the power transmission unit that drives the pump, and the turbine is vaporized by waste heat energy from the cooler. By regenerating and supplying the driving torque generated by the turbine with the low-boiling medium to the power source via the power transmission system, the pump driving power of the power source can be reduced, and the energy consumption of the power source can be reduced. The heat energy loss generated in the pressure circuit can be effectively regenerated and recovered.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram showing one embodiment of a waste heat energy regenerating apparatus according to the present invention.
FIG. 2 is a circuit diagram showing a conventional hydraulic circuit.
[Explanation of symbols]
11 Engine 12 as Power Source Main Pump 16 as Pump 16 Oil Cooler 21 as Cooler Drive Shaft 22 as Power Transmission Unit Engine Gear 24 as Power Transmission System Turbine 25 Hydraulic Circuit 32 as Fluid Pressure Circuit Compressor 34 Low boiling point medium 37 Air conditioner circuit 38 as air conditioner circuit Low boiling point medium circuit 41 Heat pipe 42 Supply line 43 Return line

Claims (4)

Absorbing the waste heat energy of the working fluid generated from a fluid pressure circuit including a pump driven by a power source using a low boiling point medium,
The heat-absorbing low-boiling medium is vaporized to rotate the power regeneration turbine,
A method for regenerating waste heat energy, comprising regenerating waste heat energy by power assisting a power source by a turbine. A fluid pressure circuit including a pump for supplying a working fluid driven by a power source,
A cooler for cooling a working fluid whose temperature rises due to energy loss of a fluid pressure circuit;
A power regeneration turbine provided to a power source and rotated by energy of a low-boiling medium vaporized;
A low-boiling medium circuit for supplying a low-boiling medium vaporized with waste heat energy from the cooler to the turbine and driving the turbine at least from the cooler to the turbine; apparatus. The low boiling point medium circuit is
A part of the low-boiling medium supplied to the evaporator of the air conditioner circuit having a compressor and an evaporator mounted on a construction machine is partially diverted and passed through the cooler, thereby absorbing heat from the cooler and having a low boiling point. A heat pipe for evaporating the medium,
A supply pipe for supplying a low-boiling medium vaporized in the heat pipe to the turbine,
3. A waste heat energy regenerating apparatus according to claim 2, further comprising a return line for returning the low boiling point medium from the turbine to the suction side of the compressor of the air conditioner circuit. The waste heat energy regeneration device according to claim 2, wherein the turbine is provided in a power transmission system in which a power source is branched from a power transmission unit that drives the pump.

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