JP2009047340A - Cogeneration device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cogeneration device effectively utilizing ventilated air, in a cogeneration device comprising a power generating unit and a hot air-type heating unit. <P>SOLUTION: In the cogeneration device 10 comprising the power generating unit 26 and the hot air-type heating unit 40, a power generating unit case 30 receiving the power generating unit 26 is provided with an inflow hole 30a21 for allowing the ventilated air to flow therein, and an outflow hole 30a22 for allowing the ventilated air to flow out therefrom, the inflow hole 30a21 and an outlet side of a blower 46 of the hot air-type heating unit 40 are connected by a ventilated air introduction duct 74, and the outflow hole 30a22 and an inlet side of the blower 46 are connected by a ventilated air supply duct 76. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cogeneration apparatus, and more particularly to a cogeneration apparatus for ventilation of a power generation unit.

In recent years, a generator driven by an internal combustion engine is connected to an AC power supply path from a commercial power system to an electrical load to supply power to the electrical load in conjunction with the commercial power system, and exhaust heat from the internal combustion engine. Various so-called cogeneration apparatuses have been proposed in which hot water or the like that has been warmed by using heat is supplied to a heat load. Among them, one that directly cools the ventilation fan motor unit with outside air while suppressing noise is known, and a technique described in Patent Document 1 can be given as an example.
Japanese Patent Laid-Open No. 11-200951

  In the technology described in Patent Document 1, in the cogeneration apparatus surrounded by the soundproof case, a ventilation fan is provided on the upper side of the soundproof case near the ventilation opening, and the ceiling plate of the soundproof case is formed in a double structure to form a hollow portion. Then, by sucking outside air through the hollow portion or the like, cooling air for directly cooling the motor portion of the ventilation fan is generated.

  In the above-described prior art, ventilation (cooling air) is exhausted outside the case after cooling the motor unit, and it is difficult to satisfy the point of effective use of ventilation.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a cogeneration apparatus that effectively uses ventilation in a cogeneration apparatus including a power generation unit and a hot air heating unit.

  In order to solve the above-described problem, in claim 1, a generator connectable to a power supply path of AC power from a commercial power system to an electric load, an internal combustion engine that drives the generator, and the internal combustion engine A hot air heating unit having a first control unit for controlling the operation of the engine, and having at least a power generation unit housed in a case and a blower for blowing hot air generated by exhaust heat of the internal combustion engine to a heat load In the cogeneration apparatus, an inflow hole through which ventilation flows into the case and an outflow hole through which the air flows out are formed, the inflow hole and the outlet side of the blower are connected by a ventilation introduction duct, and the outflow hole and the blower are connected The inlet side is connected with a ventilation supply duct.

  The cogeneration apparatus according to claim 2 includes a second control unit that controls the operation of the blower, and the second control unit changes the air volume according to the power generation amount of the power generation unit. The operation of the blower is controlled.

  In the cogeneration apparatus according to claim 3, the case is partitioned into at least two chambers, the internal combustion engine and the generator are accommodated in one chamber, and the first control is accommodated in the other chamber. And at least the first control unit is cooled by ventilation introduced from the ventilation introduction duct.

  In the cogeneration apparatus according to a fourth aspect, the hot air heating unit is configured to be accommodated integrally with the power generation unit in a common case.

  In the cogeneration apparatus according to claim 1, an inflow hole for inflowing ventilation and an outflow hole for outflow are formed in the case in which the power generation unit is accommodated, and the inflow hole and the outlet side of the blower of the hot air heating unit are provided. Since it is connected with the ventilation introduction duct and the outlet hole and the inlet side of the blower are connected with the ventilation supply duct, the blower can introduce the heat demand side, for example, cold air of each room into the case through the ventilation introduction duct. Therefore, the ventilation raised in temperature by cooling the case is supplied to the inlet side of the blower of the hot air heating unit through the ventilation supply duct, so that the ventilation can be used effectively.

  In the cogeneration apparatus according to the second aspect, the second control unit that controls the operation of the blower is provided, and the second control unit is configured so that the air volume changes according to the power generation amount of the power generation unit. Since the operation is configured to be controlled, in addition to the above-described effect, when the heat generation amount of the first control unit of the power generation unit increases in accordance with the increase in power generation amount, the air volume of the blower is changed in accordance with the power generation amount. Thus, ventilation can be used more effectively.

  In the cogeneration apparatus according to claim 3, the case is partitioned into at least two chambers, the internal combustion engine and the generator are accommodated in one chamber, and the first control unit is accommodated in the other chamber. Since at least the first control unit is configured to be cooled by ventilation introduced from the ventilation introduction duct, in addition to the above-described effects, at least the first control unit including electrical components that easily generate heat is cooled. In addition, the exhaust heat raised by cooling can be used more effectively.

  In the cogeneration apparatus according to claim 4, since the hot air heating unit is configured to be housed integrally with the power generation unit in the common case, in addition to the above-described effect, the ventilation heated by the power generation unit. Can be supplied to the warm air heating unit side more efficiently and the temperature can be raised.

  Furthermore, by integrating, heat radiation from the internal combustion engine and generator of the power generation unit can be transmitted to the hot air heating unit side through heat conduction, and common parts can be consolidated, and the device is compact. Can be.

  The best mode for carrying out a cogeneration apparatus according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram schematically showing a cogeneration apparatus according to a first embodiment of the present invention.

  As shown in the figure, the cogeneration apparatus (denoted by reference numeral 10) is a generator that can be connected to an AC power supply path (power line) 16 from a commercial power source (commercial power system) 12 to a domestic electrical load (electric load) 14. (Shown as “GEN”) 20, an internal combustion engine (shown as “ENG”, hereinafter referred to as “engine”) 22 for driving the generator 20, and a power generation unit (first control unit) 24. Is provided.

  The commercial power supply 12 outputs AC power of 50 Hz (or 60 Hz) at 100/200 V AC from a single-phase three-wire. The power generation unit 26 is integrated and accommodated in a power generation unit case (housing) 30.

  More specifically, as shown in the figure, the power generation unit case 30 is partitioned into two chambers 30a1 and 30a2 by a partition 30a, and the generator 20 and the engine 22 are vertically arranged in the right chamber 30a1 in the drawing in the vertical direction. The power generation control unit 24 is accommodated in the left chamber 30a2. The power generation control unit 24 is isolated from the engine 22 and is housed in a separate room from the engine 22 so as to block heat dissipation from the engine 22 as much as possible.

  The engine 22 is a water-cooled four-cycle single-cylinder OHV type spark ignition engine that uses city gas (or LP gas) as fuel, and has a displacement of, for example, 163 cc. Although illustration is omitted, in the power generation unit case 30, the cylinder head and the cylinder block of the engine 22 are arranged in the horizontal (horizontal) direction, and one piston is arranged in the inside thereof so as to be able to reciprocate.

  The air-fuel mixture is sucked from an air intake pipe (not shown) supplied from an air intake duct 22a that is airtightly attached to the power generation unit case 30 and mixed with a gas (also not shown) by a mixer (not shown). Flows into a combustion chamber (not shown), burns when ignited to drive a piston (not shown), and is connected to the piston in the vertical (vertical) direction in the power generation unit case 30 (not shown). ).

  Thus, the generated exhaust gas flows from an exhaust pipe (not shown) through an exhaust duct 32 that is airtightly attached to the power generation unit case 30 and is discharged outdoors.

  A cooling water circulation path 34 is formed in the vicinity of a heat generating part such as a cylinder block, and the cooling water made of antifreeze flowing inside the heat exchanger heats up the heat generating part to cool the engine 22 and raises the temperature in the exhaust pipe. The cooling water flowing through the exhaust heat exchanger 36 provided along the heat exchanger 36 is further heated by the heat exchange there.

  A flywheel (not shown) is attached to the upper end of the crankshaft, and a generator 20 composed of a multipolar coil is disposed inside the flywheel. When the generator 20 rotates relative to the flywheel, it generates AC power. The output of the generator 20 is sent to the power generation control unit 24.

  Although not shown, the power generation control unit 24 includes an electronic control unit (Electronic Control Unit; hereinafter referred to as “ECU”) composed of a microcomputer, an inverter, and a DC / DC converter. An inverter converts the output of the generator 20 into AC100 / 200V (single phase) through a DC / DC converter.

  The power generation output of the power generation unit 26 is about 1.0 kW. The output of the inverter is connected to the power supply path 16 via a breaker (not shown). Conversely, the generator 20 also functions as a starter motor for cranking the engine 22 when energized from the commercial power supply 12 through the inverter. The ECU of the power generation control unit 24 switches the function of the generator 20 between the starter and the generator and controls the operation of the engine 22 and the like.

  The cogeneration apparatus 10 includes a hot air heating unit 40 in addition to the power generation unit 26.

  The hot air heating unit 40 is a blower that blows hot air generated by exhaust heat of the engine 22 to a heat load, more specifically, an exhaust heat exchanger 42 connected to the cooling water circulation path 34 of the engine 22, and a burner 44, a sensible heat exchanger 44b and a latent heat exchanger 44c connected to the combustion gas intake / exhaust passage 44a of the burner 44, an exhaust air exhaust heat exchanger 42, and a sensible heat exchanger 44b and latent heat The above-described blower 46 for supplying heat to the exchanger 44c to exchange heat and supplying the generated hot air into the room from the hot air passage and the hot air heating unit control unit (second control unit) 50 are provided.

  The hot air heating unit 40 is accommodated in a hot air heating unit case (not shown) and is connected to each room via a hot air passage.

  Hereinafter, the above-described configuration will be described individually.

  The power generation unit 26 and the hot air heating unit 40 are connected by the cooling water circulation path 34 described above. That is, the cooling water circulation path 34 extends from the engine 22 toward the hot air heating unit 40 and is connected to the exhaust heat exchanger 42 disposed in the vicinity of the blower 46, where the cold air in each room sucked by the blower 46 is connected. After the heat exchange, the engine 22 is returned.

  The cold air is heated by heat exchange in the exhaust heat exchanger 42 to become hot air, and is supplied to each room from a blower duct (not shown) through a hot air passage by the blower 46 to heat each room. .

  The burner 44 is a combustion fan that sucks air from outside through the intake / exhaust passage 44a and mixes it with supplied gas (not shown) to burn it. The combustion gas generated thereby passes through the sensible heat exchanger 44b and the latent heat exchanger 44c and is discharged to the outside from the intake / exhaust passage 44a.

  The sensible heat exchanger 44b and the latent heat exchanger 44c raise the temperature by exchanging heat with air passing through a blower duct (not shown) of the blower 46. Specifically, the sensible heat exchanger 44b radiates heat up to the dew point of the combustion gas, and the latent heat exchanger 44c radiates heat below the dew point. The condensed water generated in the latent heat exchanger 44c is discharged outdoors through a drain pipe (not shown).

  While the blower 46 sucks cold air from each room on the inlet side, the temperature of the blower 46 is increased by heat exchange in the exhaust heat exchanger 42, and hot air heated further by the combustion of the burner 44 is blown on the outlet side. The air is blown into each room and the rooms are heated.

  Similarly to the ECU of the power generation control unit 24, the hot air heating unit control unit (hereinafter referred to as “hot air control unit”) 50 also includes an ECU (electronic control unit) formed of a microcomputer. The ECU of the hot air control unit is communicably connected to the ECU of the power generation control unit 24 and is also communicably connected to a remote controller 60 (shown as “remote control” in the drawing). The remote controller 60 is operated by a user and used for setting a target room temperature and the like.

  In FIG. 1, T is a temperature sensor, V is a valve, P is a pump, and signal lines are partially omitted, but they are electrically connected to the hot air control unit 50. The hot air control unit 50 controls the operation of the valve V and the pump P based on the outputs of the temperature sensors 62 and 64 to control the exhaust heat recovery of the engine 22 and the operation of the blower 46 and the burner 44.

  That is, the hot air controller 50 drives the exhaust heat pump 70 to pump the cooling water flowing through the cooling water circulation path 34 to the exhaust heat heat exchanger 42, and is sucked by the circulating water flowing through the cooling water circulation path 34 and the blower 46. Heat exchange with cold air in each room.

  In consideration of corrosion prevention due to accumulation of condensed water inside the exhaust heat exchanger 36 and durability of engine oil, the hot air control unit 50 sets the inlet temperature of the engine 22 of cooling water to, for example, 70 ° C. To control.

  The hot air control unit 50 operates the power generation unit 26 when the detected room temperature does not reach the set temperature even after the specified time has elapsed, or when the difference between the detected room temperature and the set temperature exceeds a predetermined value. The burner 44 is operated (combusted) until it reaches the set temperature, and the warm air heated by the burner 44 is supplied to each room by the blower 46.

  Further, the hot air control unit 50 changes the air volume of the blower 46 in accordance with the power generation amount of the power generation unit 26, more specifically, the operation of the blower 46 so that the air volume of the blower 46 increases as the power generation amount increases. Control.

  What is characteristic in the cogeneration apparatus 10 according to this embodiment is that an inflow hole 30a21 for inflowing ventilation and an outflow hole 30a22 for inflowing ventilation are formed above and below the chamber 30a2 of the power generation unit case 30 and formed below. The inflow hole 30a21 thus formed and the outlet side (positive pressure side) of the blower 46 are connected by a ventilation introduction duct 74, and the outflow hole 30a22 drilled upward and the inlet side (negative pressure side) of the blower 46 are connected by a ventilation supply duct 76. This is because it is configured to be connected.

  As described above, the blower 46 sucks cold air from each room, and blows warm air heated by the exhaust heat exchanger 42 or the like from the air duct to each room. Thus, the cold air sucked from each room is introduced into the room 30a2 as ventilation (cooling air).

  The introduced cold air flows upward from below along the power generation control unit 24 of the chamber 30a2, and cools electrical components such as an inverter and a DC / DC converter that easily generate heat. Ventilation heated by heat exchange in the chamber 30a2 is supplied from the ventilation supply duct 76 to the outlet side (positive pressure side) of the blower 46, and further heated by the exhaust heat exchanger 42 and supplied to each room. Is done.

  The ventilation introduction duct 74 connects the outlet side (positive pressure side) of the blower 46 to the chamber 30a2, and the ventilation supply duct 76 connects the inlet side (negative pressure side) of the blower 46 to the chamber 30a2. Inflow or outflow is facilitated.

  The ventilation introduction duct 74 and the ventilation supply duct 76 are provided with orifices 74a and 76a so that the inflow or outflow ventilation amount becomes an appropriate amount for cooling the power generation control unit 24, and the negative pressure generated in the blower 46 is reduced. Prevent effects.

  As described above, in the cogeneration apparatus 10 according to the first embodiment, the inflow hole 30a21 for allowing ventilation to flow into the power generation unit case 30 in which the power generation unit 26 is accommodated and the outflow hole 30a22 for allowing outflow are formed. And the outlet side of the blower 46 of the hot air heating unit 40 are connected by a ventilation introduction duct 74, and the outlet side 30a22 and the inlet side of the blower 46 are connected by a ventilation supply duct 76. For example, cold air in each room can be introduced into the power generation unit case 30 via the ventilation introduction duct 74, while ventilation raised in temperature by cooling the power generation unit case 30 is introduced to the blower 46 of the hot air heating unit 40 via the ventilation supply duct 76. Therefore, ventilation can be used effectively.

  That is, the ventilation that has been introduced and raised in temperature by heat exchange in the chamber 30a2 is supplied from the ventilation supply duct 76 to the outlet side of the blower 46, and further raised in temperature by the exhaust heat exchanger 42 or the like. Since it is supplied, the frequency of burning the burner 44 is reduced, so that ventilation can be used effectively.

  Further, since the operation of the blower 46 is controlled so that the air volume changes according to the power generation amount of the power generation unit 26, in addition to the above effects, the heat generation amount of the power generation control unit 24 according to the increase in the power generation amount. When increasing, ventilation can be used more effectively by changing the air volume of the blower 46 according to the power generation amount.

  The power generation unit case 30 is partitioned into at least two chambers 30a1 and 30a2, the engine 22 and the generator 20 are accommodated in one chamber 30a1, and the power generation control unit 24 is accommodated in the other chamber 30a2, and at least power generation Since the control unit 24 is configured to be cooled by ventilation introduced from the ventilation introduction duct 74, in addition to the above-described effects, at least the power generation control unit 24 including electrical components that easily generate heat is cooled, so that the temperature is increased by cooling. The warm exhaust heat can be used more effectively.

  In addition, the upper part of the partition 30a is cut away, and as shown by an imaginary line in FIG. 1, the chambers 30a2 and 30a1 communicate with each other, an outflow hole 30a11 is formed above the chamber 30a1, and the ventilation supply duct 74 is indicated by an imaginary line. You may comprise so that it may extend only by.

  Thereby, the ventilation further raised in temperature by the heat released from the engine 22 can be supplied from the ventilation supply duct 76 to the warm air heating unit 40 side.

  FIG. 2 is a block diagram generally showing a cogeneration apparatus according to the second embodiment of the present invention.

  The description will focus on the differences from the first embodiment. In the cogeneration apparatus according to the second embodiment, the hot air heating unit 40 is accommodated integrally with the power generation unit 26 in the common case. Configured.

  That is, in the second embodiment, the power generation unit 26 and the hot air heating unit 40 are accommodated in one common case 80. In addition, the power generation control unit 24 of the power generation unit 26 and the ECU of the hot air control unit 50 of the hot air heating unit 40 are made common to form a common control unit 82.

  In the cogeneration apparatus 10 according to the second embodiment, the hot air heating unit 40 is configured to be housed integrally with the power generation unit 26 in the common case 80, so that ventilation is effective as in the first embodiment. Can be used. Further, by integrating, heat radiation from the engine 22 and the generator 20 of the power generation unit 26 can be transmitted to the warm air heating unit 40 side through heat conduction, and common parts can be consolidated. In addition, the apparatus can be made compact.

  As described above, in the first and second embodiments, the generator 20 that can be connected to the AC power supply path (power line) 16 from the commercial power system (commercial power source) 12 to the electrical load 14, and the power generation A power generation unit 26 that has an internal combustion engine (engine) 22 that drives the machine 20 and a first control unit (power generation control unit) 24 that controls the operation of the internal combustion engine and is housed in a case (power generation unit case) 30. And a cogeneration apparatus 10 including a warm air heating unit 40 having at least a blower 46 for blowing warm air generated by exhaust heat of the internal combustion engine to a heat load, and an outflow hole 30a21 for allowing ventilation to flow into the case An outflow hole 30a22 is formed, the inflow hole 30a21 and the outlet side of the blower 46 are connected by a ventilation introduction duct 74, and the outflow hole 30a2 is connected. And it was composed as connecting the inlet side of the blower 46 in the ventilation supply duct 76.

  In addition, a second control unit (a control unit of the hot air heating unit 40) 50 that controls the operation of the blower is provided, and the second control unit changes the air volume according to the power generation amount of the power generation unit 26. In this way, the operation of the blower 46 is controlled.

  The case is partitioned into at least two chambers 30a1 and 30a2, and the internal combustion engine 22 and the generator 20 are accommodated in one chamber 30a1, and the first control unit (power generation control) is accommodated in the other chamber 30a2. 24) and at least the first control unit is cooled by ventilation introduced from the ventilation introduction duct 74.

  Further, in the cogeneration apparatus according to the second embodiment, the hot air heating unit 40 is configured to be accommodated integrally with the power generation unit 24 in the case, more specifically, in the common case 80. .

  In the above description, the gas engine using city gas / LP gas as fuel is used as a drive source of the generator 20, but an engine using gasoline fuel or the like may be used.

  Moreover, although the output of the generator 20, the displacement of the engine 22 and the like are shown as specific values, it goes without saying that these are merely examples and are not limited.

1 is a block diagram generally showing a cogeneration apparatus according to a first embodiment of the present invention. It is a block diagram which shows generally the cogeneration apparatus which concerns on 2nd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Cogeneration apparatus, 12 Commercial power supply (commercial power system), 14 Domestic electric load (electric load), 16 Feeding path (power line), 20 Generator, 22 Engine (internal combustion engine), 24 Power generation control part, 26 Power generation unit , 30 Power generation unit case, 30a partition, 30a1 one chamber, 30a2 other chamber, 30a21 ventilation inflow hole, 30a22 ventilation outflow hole, 34 cooling water circulation path, 36 exhaust heat exchanger, 40 hot air heating unit, 42 exhaust Thermal heat exchanger, 44 burner, 44b Sensible heat exchanger, 44c Latent heat exchanger, 50 Hot air heating unit controller, 74 Ventilation introduction duct, 76 Ventilation supply duct, 80 Common case

Claims (4)

  A power generator that can be connected to a power supply path from a commercial power system to an electrical load, an internal combustion engine that drives the generator, a first control unit that controls the operation of the internal combustion engine, and a case In a cogeneration apparatus comprising a housed power generation unit and a warm air heating unit having at least a blower for blowing warm air generated by exhaust heat of the internal combustion engine to a heat load, an inflow hole for allowing ventilation to flow into the case A cogeneration system is characterized in that an outflow hole for allowing outflow is formed, the inflow hole and the outlet side of the blower are connected by a ventilation introduction duct, and the outflow hole and the inlet side of the blower are connected by a ventilation supply duct. apparatus.   A second control unit that controls the operation of the blower is provided, and the second control unit controls the operation of the blower so that the air volume changes according to the power generation amount of the power generation unit. The cogeneration apparatus according to claim 1.   The case is partitioned into at least two chambers, the internal combustion engine and the generator are accommodated in one chamber, the first control unit is accommodated in the other chamber, and at least the first control unit is The cogeneration apparatus according to claim 1, wherein the cogeneration apparatus is cooled by ventilation introduced from the ventilation introduction duct.   The cogeneration apparatus according to any one of claims 1 to 3, wherein the warm air heating unit is accommodated integrally with the power generation unit in a common case.