JP2006322428A - Engine-drive working device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine-drive working device whose efficiency is improved in a cogeneration operation recovering heat energy from engine cooling water. <P>SOLUTION: In the engine-drive working device which comprises a supercharger, an air cooler cooling compressed air supplied by the supercharger, a radiator cooling engine cooling water, a three-way valve branching cooling water flowing to the radiator, a heat exchanger performing heat exchange between cooling water branched by the three-way valve and secondary cooling water, a working machine driven by the engine, and a control device controlling the engine and the working machine, a fan for the radiator, a fan for the air cooler, an engine cooling fan, and partition walls dividing each cooling air are provided, and efficiency of the engine-drive working device is improved since the fan for the radiator is stopped when the whole quantity of cooling water flows in the heat exchanger. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an engine-driven work device, and more particularly, to an engine-driven work device that includes a supercharger in an engine and collects thermal energy held by engine coolant as hot water.

An engine drive work device that performs cooling using a conventional electric fan is disclosed in, for example, Patent Document 1.
Hereinafter, the configuration of a conventional engine-driven work device will be described with reference to FIGS.

  FIG. 5 is a plan view of a conventional engine-driven work device as viewed from above, FIG. 6 is a plan view of the internal structure of FIG. 5 as viewed from above, and FIG. 7 is a side view of the internal structure of FIG. .

  As shown in the figure, a conventional engine-driven work device constitutes an engine 1, a work machine 2 driven by the engine 1, a control panel 3 for controlling the engine 1 and the work machine 2, and an engine-driven work apparatus. It is equipped with a housing 4 that houses the equipment and protects it from wind and rain. The supercharger 5 is connected to the exhaust port of the engine 1 by an exhaust collecting pipe 6, is driven by the exhaust gas of the engine 1 collected by the exhaust collecting pipe 6, and is used for combustion through an intake filter 7 and a pipe 8. The air is sucked and compressed to have a high density. The exhaust gas exiting the supercharger 5 is guided to the silencer 10 by the pipe 9, attenuates the loudness, and is discharged to the atmosphere by the exhaust pipe 11.

  The combustion air adiabatically compressed by the supercharger 5 is in a high temperature state of 150 to 250 ° C. and is cooled by the air cooler 13 through the pipe 12. The cooled air exchanges heat with the cooling air 16 sucked from the air intake 14 and blown by the electric cooling fan 15, cooled to 40 to 100 ° C., and then passed through the pipe 17 and the intake manifold 18 to the engine 1. Supplied. Since the density of the combustion air is increased by cooling the combustion air with the air cooler 13, the efficiency of the engine 1 is improved by 2 to 5% and the rated output is 15 compared with the case where the air cooler 13 is not provided. ~ 25% improvement.

  On the other hand, the cooling water having a temperature of 80 to 100 ° C. sent from the engine 1 is led to the radiator 20 by the pipe 19 and exchanged with the cooling air 22 sucked from the air intake 21 and blown by the electric cooling fan 15. It is cooled to 70 to 90 ° C. and supplied again to the engine 1 through the pipe 23. As the work machine 2, an air compressor, a generator, a welder, or the like is selected depending on the place where the engine-driven work device is installed and the application. A work machine 2 is connected to the engine 1 so that a desired work can be performed. A torsional vibration damper 24 is attached to the shaft end of the engine 1 opposite to the work machine. The torsional vibration damper 24 is a device for absorbing vibration composed of a weight and oil, rubber, or the like. The torsional vibration of the crankshaft of the engine 1 is absorbed by oil or rubber to protect the crankshaft from damage. . The control panel 3 performs control to keep the engine 1 and the work machine 2 in an appropriate state according to the working state of the engine-driven work device. The housing 4 houses the equipment that constitutes the engine-driven work device, protects it from wind and rain, and at the same time has the role of a ventilation path so that the air taken into the housing 4 is discharged through an appropriate route. Yes. The arrows in the figure indicate the air flow.

  In the side view of FIG. 7, the space where the air cooler 13 and the radiator 20 are installed and the space where the engine 1, the work machine 2, and the control panel 3 are installed are separated by a partition wall 25. 26 is cooling. Cooling air 27 for cooling the engine 1 is sucked from the cooling air intake 28 of the housing 4 and blown by the ventilation fan 26. In the figure, one electric cooling fan 15 and one ventilation fan 26 are installed, but a plurality may be installed as necessary.

  A system that recovers hot water as heat energy from engine cooling water, like the engine-driven work device configured as described above, is called cogeneration, and is an energy-saving technology that can produce both electric energy and heat energy at the same time. Widely used.

  FIG. 8 is a configuration diagram in which a system for recovering thermal energy as hot water from the cooling water of the engine 1 is added to the conventional engine-driven work device.

  As shown in FIG. 8, a bypass pipe 30 branched from the pipe 19 is connected to the heat exchanger 29, and cooling water for the engine 1 is supplied. On the other hand, secondary cooling water is supplied to the heat exchanger 29 from the outside of the engine working machine through a pipe 31. By performing heat exchange between the cooling water and the secondary cooling water by the heat exchanger 29, the temperature of the cooling water of the engine 1 is lowered and the temperature of the secondary cooling water is raised. The secondary cooling water whose temperature has risen is supplied through a pipe 32 to a heat utilization device such as a heating device such as a heater or a hot water absorption refrigerator that operates using the secondary cooling water as a heat source. The secondary cooling water whose temperature has been lowered by the heat utilization device returns to the heat exchanger 29 through the pipe 31 again.

On the other hand, the cooling water of the engine 1 whose temperature has been lowered by the heat exchanger 29 is returned by the bypass pipe 34 connected to the pipe 23 via the three-way valve 33, thereby cooling the engine 1 again. The three-way valve 33 prevents the temperature of the cooling water of the engine 1 from exceeding the allowable value when the return temperature of the secondary cooling water becomes high, such as when the load on the heat utilization device on the secondary cooling water side is small. The cooling water is configured to radiate heat by bypassing it to the radiator 20 side. The three-way valve 33 adjusts the bypass flow rate so as to keep the temperature of the cooling water constant.
Japanese Patent Application No. 2004-14482

  As described above, when the engine-driven work device is operated as cogeneration, the cooling water of the engine 1 is cooled by the secondary cooling water that is on the heat utilization side. Less than if not. For example, when the load amount of the heat utilization device is equal to the heat energy that can be discharged from the engine cooling water, the radiator 20 is not necessary, and the cooling air 22 for cooling it is not necessary. Therefore, when the cogeneration operation is performed, the electric cooling fan 15 can be stopped or its rotational speed can be reduced, so that the power consumption is reduced and the efficiency of the engine-driven work device is improved.

  However, in the conventional engine-driven work device with the supercharger 5, when the electric cooling fan 15 is stopped, the cooling air 16 that cools the air cooler 13 is also stopped at the same time. There were problems such as exhaust gas becoming black smoke.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an engine-driven work device in which energy efficiency is improved even during cogeneration operation for recovering thermal energy from engine cooling water. is there.

  In order to achieve the above object, the present invention provides an engine, a supercharger that is driven by exhaust gas of the engine to supply compressed air, and a compressed air that is supplied by the supercharger. An air cooler that cools and supplies the engine with cooling water, a radiator that cools the cooling water of the engine, a three-way valve that branches the cooling water that flows to the radiator, and a cooling water that is branched by the three-way valve and a secondary A heat exchanger that exchanges heat with cooling water, a cooling fan that supplies cooling air to the air cooler and the radiator, a working machine driven by the engine, the engine, and the working machine In the engine-driven work device configured by a control device that controls the radiator, a radiator fan that blows cooling air to the radiator and an air cooler fan that blows cooling air to the air cooler. An engine cooling fan that supplies cooling air to the engine, and a partition that separates each cooling air, and the radiator fan is stopped when the entire amount of the cooling water is flowing to the heat exchanger. Features.

  If comprised in this way, since the power consumption of a cooling fan can be reduced at the time of the cogeneration operation | movement which collect | recovers thermal energy from the cooling water of an engine, the energy efficiency of an engine drive work apparatus improves.

  According to a second aspect of the present invention, in the engine-driven work device according to the first aspect, the temperature sensor that measures the outside air temperature, and the fan is driven at a predetermined fan rotation speed according to the outside air temperature detected by the temperature sensor. And a fan control circuit for operating the air cooler fan and the engine fan by the fan control circuit.

  If comprised in this way, since the power consumption of a cooling fan can be reduced at the time of the cogeneration operation | movement which collect | recovers thermal energy from the cooling water of an engine, the energy efficiency of an engine drive work apparatus improves.

  According to a third aspect of the present invention, in the engine-driven work device according to the first or second aspect, an opening is provided in a partition partitioning the air cooler and the cooling air of the engine. .

  If comprised in this way, since the power consumption of a cooling fan can be reduced at the time of the cogeneration operation | movement which collect | recovers thermal energy from the cooling water of an engine, the energy efficiency of an engine drive work apparatus improves.

  ADVANTAGE OF THE INVENTION According to this invention, the engine drive work apparatus which improved energy efficiency at the time of the cogeneration operation | movement which collect | recovers thermal energy from the engine cooling water can be provided.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a plan view of an engine drive working apparatus according to a first embodiment of the present invention as viewed from above, and FIG. 2 is a plan view of the internal structure of FIG. 1 as viewed from above. The same components as those of the engine-driven work device are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 1 and 2, the configuration of the engine-driven work device according to the first embodiment of the present invention is different from that of the conventional engine-driven work device. The air cooler fan 36 for blowing cooling air and the radiator fan 37 are installed in the respective compartments instead of the electric cooling fan 15, and the other configurations are the same. FIG. 1 shows an example in which two air cooler fans 36 and two radiator fans 37 are installed.

  When the three-way valve 33 bypasses all the cooling water of the engine 1 when operating in the cogeneration system for recovering heat from the hot water by the engine-driven working device of this embodiment configured as described above, the radiator fan 37 is installed. Since it can be stopped, the power consumption can be reduced.

  As described above, according to the present embodiment, the power consumption of the cooling fan can be reduced during the cogeneration operation for recovering the thermal energy from the engine cooling water, thereby improving the energy efficiency of the engine-driven work device. be able to.

(Second embodiment)
A second embodiment of the present invention will be described with reference to FIGS.
This embodiment differs from the first embodiment in that a temperature sensor (not shown) that measures the outside air temperature outside the housing 4 and a fan rotation that is preset according to the temperature detected by this temperature sensor. A fan control circuit (not shown) for driving the cooling fan at a speed is added, and the other configuration is the same as that of the first embodiment.

  In this embodiment, the fan control circuit drives the ventilation fan 26 and the air cooler fan 36. In this fan control circuit, a fan speed corresponding to the outside air temperature is set. Since the fan air volume is approximately proportional to the rotational speed, the fan speed setting can be considered to be equivalent to the relationship between the outside air temperature and the air volume. The fan speed is determined by the outside air temperature and the required air volume at that time. For example, the air volume of the cooling air 16 necessary for the air cooler 13 at a certain outside air temperature can be obtained as the air volume when the combustion air flowing through the pipe 17 reaches the upper limit of the allowable temperature range. The air volume of the cooling air 27 that cools the engine 1 can be obtained as the air volume when the temperature of the torsional vibration damper 24 reaches the upper limit of the allowable temperature range. The required air volume thus obtained is set in the fan control circuit as the rotational speed of the cooling fan.

  Furthermore, the fan control circuit includes an inverter (not shown), and is configured to drive the cooling fan at a fan speed corresponding to the outside air temperature. Since the air cooler fan 36 and the ventilation fan 26 are driven and controlled by a fan control circuit, the fan 36 and the ventilation fan 26 rotate at a necessary minimum rotational speed corresponding to the outside air. Since the loss of the fan is proportional to the cube of the rotational speed, power consumption can be greatly reduced.

  When the engine-driven work device configured as described above is operated with a cogeneration system that recovers heat from hot water, the radiator fan 37 is stopped when the three-way valve 33 bypasses all of the cooling water of the engine 1. Further, since the air cooler fan 36 and the ventilation fan 26 can be operated at the minimum necessary rotational speed, the power consumption can be further reduced.

  As described above, according to the present embodiment, the power consumption of the cooling fan can be reduced during the cogeneration operation for recovering the thermal energy from the engine cooling water, thereby improving the energy efficiency of the engine-driven work device. be able to.

(Third embodiment)
3 is a plan view of the third embodiment of the present invention as seen from above, and FIG. 4 is a plan view of the internal structure of FIG. 3 as seen from above.
As shown in FIGS. 3 and 4, the third embodiment of the present invention differs from the first embodiment of FIGS. 1 and 2 in that an opening 38 is provided in the partition wall 25 and the ventilation fan 26 is eliminated. In other respects, the configuration is the same as that of the first embodiment.

  When the engine drive working device is configured in this manner, the cooling air can be blown to the torsional vibration damper 24 of the engine 1 by the rotation of the air cooler fan 36, so the fan control circuit and the ventilation fan 26 are eliminated. be able to. Therefore, the power consumption can be reduced.

  As described above, according to this embodiment, it is possible to provide an engine-driven work device with improved energy efficiency by reducing the power consumption of the cooling fan during the cogeneration operation for recovering thermal energy from the engine coolant.

The top view of the engine drive work apparatus of 1st Example of this invention. The top view which looked at the internal structure of the engine drive working apparatus of FIG. 1 from the top. The top view of the engine drive work apparatus of 3rd Example of this invention. The top view which looked at the internal structure of the engine drive work apparatus of FIG. 3 from the top. The top view of the conventional engine drive working apparatus. The top view which looked at the internal structure of the engine drive work apparatus of FIG. 5 from the top. The side view which looked at the internal structure of the conventional engine drive working apparatus from the side. The top view which looked at the internal structure which added the recovery system from the cooling water to the engine drive work apparatus of FIG. 7 from the top.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Working machine, 3 ... Control panel, 4 ... Housing, 5 ... Supercharger, 6 ... Exhaust collecting pipe, 7 ... Air supply filter, 8 ... Pipe (intake filter-supercharger), 9 ... pipe (supercharger to silencer), 10 ... silencer, 11 ... exhaust pipe, 12 ... pipe (supercharger to air cooler), 13 ... air cooler, 14 ... cooling air intake (for air cooler) ), 15 ... electric cooling fan, 16 ... cooling air (air cooler side), 17 ... pipe (air cooler to intake manifold), 18 ... intake manifold, 19 ... pipe (engine to radiator), 20 ... Radiator, 21 ... Cooling air intake (for radiator), 22 ... Cooling air (radiator side), 23 ... Tube (radiator to engine), 24 ... Torsional vibration damper, 25 ... Bulkhead (engine room), 26 ... Ventilation fan, 27 ... cooling air (engine side), 28 ... cooling air intake port (engine side), 29 ... heat exchanger, 30 ... Ipass pipe (engine to heat exchanger), 31 ... pipe (secondary cooling water line), 32 ... pipe (secondary cooling water return), 33 ... three-way valve, 34 ... bypass pipe (heat exchanger to engine), 35 ... partition walls (heatsink and air cooler), 36 ... air cooler fan, 37 ... heatsink fan, 38 ... opening.

Claims (3)

  An engine, a supercharger that is driven by the exhaust gas of the engine and supplies compressed air, an air cooler that cools and supplies the compressed air supplied by the supercharger, and cooling water for the engine A radiator for cooling, a three-way valve for branching the cooling water flowing to the radiator, a heat exchanger for exchanging heat between the cooling water branched by the three-way valve and the secondary cooling water, and the air cooler And a cooling fan that supplies cooling air to the radiator, a working machine driven by the engine, an engine, and a control device that controls the working machine. A radiator fan for blowing air, an air cooler fan for blowing cooling air to the air cooler, an engine cooling fan for supplying cooling air to the engine, and Comprising a partition wall partitioning the respective cooling air, the engine-driven working apparatus characterized by stopping the condenser-use fan when the entire amount of the cooling water is flowing in the heat exchanger.   2. The engine-driven work device according to claim 1, further comprising: a temperature sensor that measures an outside air temperature; and a fan control circuit that is driven at a fan rotation speed that is determined in advance according to the outside air temperature detected by the temperature sensor. An engine-driven work device, wherein the fan for the machine and the fan for the engine are operated by the fan control circuit, respectively.   3. The engine-driven work device according to claim 1, wherein an opening is provided in a partition partitioning the air cooler and the cooling air of the engine.

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