JP6748699B2 - Simple emergency power supply device - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention uses a small gas engine and a DC generator to supply emergency power with high efficiency even if a power failure accident occurs several times or many times intermittently. The present invention relates to a simplified emergency power supply device having a voice output configuration (speaker output configuration) for supplying emergency power within a few minutes from a voice output unit.

As a small-sized emergency power supply device (such as an uninterruptible power supply device) for household use or for signs etc. in the event of a power outage of less than 10 kW in case of a disaster, there are a storage battery type and a system for generating power by an engine. The storage battery has advantages such as a short time from power failure to lighting and simple operation, but has a big disadvantage that the mass is increased.

For example, 1 kW of electricity can be supplied for 72 hours (there is a prospect for restoration of the infrastructure destroyed by the disaster 3
(Day) Try to find the mass of the storage battery when supplying. Since 1kW is 1kJ/s, it will be 1kJ/s×72×3600s=259200kJ in 72 hours. However, since the storage battery is DC, if the efficiency of the inverter that converts this to AC is 93%, then at least 259200 kJ/0.93 = 278710 kJ (≈2797 MJ) of electrical energy must be stored in the storage battery. Even a lithium-ion battery with a large energy density (electrical energy per unit mass) is 100 Wh/kg at most, so 100 J/s×3600s=360 000 J=360 kj, that is, 360 kj per kg. Therefore, the mass of the storage battery is 278710kJ/(360kJ/kg) = 774kg.

On the other hand, the power generated by the engine can be generated as long as the fuel continues, but it takes several tens of seconds until the engine is started and a stable electric output can be supplied, and during this period, the power failure will continue. Further, as described above, in a small-sized device, since the remaining power is small, if the required power (electric load) suddenly increases, the rotation speed of the engine decreases and the power supply cannot keep up, or the engine stops. Sometimes. Thus, there were major problems with both the storage battery type and the engine generator.

Further, as an AC uninterruptible power supply device, there is Patent Document 1, but this document is not for commercial power supply, but is used in a mountain area, a remote island, etc. The engine generator is used in this device, but the type of the engine is unknown, and it is not necessarily an excellent engine generator.

Further, in Patent Document 2, although the uninterruptible power supply device is composed of a storage battery and an engine, the storage battery has a small capacity so that power can be supplied from the engine. Thus, if the commercial power supply is lost, the cited document 2 cannot handle it at all. The type of engine in Patent Document 2 is also unknown, and it is hard to say that it is an excellent engine generator.

In Patent Documents 1 and 2, both are uninterruptible power supply devices, but in particular, even if a small and small-capacity uninterruptible power supply such as a personal computer is covered by another means, it takes a relatively long period of 1 to 3 days. There is no good engine generator that can fully use a certain daily power source even during a power failure. Furthermore, there is a simple emergency power supply device with a voice output configuration that supplies emergency power within a short time from a voice output unit (speaker output configuration) provided in place at the same time as the power outage. There wasn't.

Japanese Patent Laid-Open No. 5-207684 JP, 2001-45681, A

The problem (technical problem or purpose, etc.) to be solved by the present invention cannot be dealt with instantaneously at the time of power failure, or even if the power failure continues for about 1 to 3 days (a large-scale disaster, for example, 3. 11) To provide a small-sized emergency power supply device that easily supplies power not only to homes but also to traffic lights, various signs, and surveillance cameras. In particular, it is to realize that even if a commercial power source is lost several times due to a disaster or the like (such as the Kumamoto Earthquake), it can be sufficiently dealt with. Furthermore, it is also desirable to realize the existence of an emergency power supply device having a voice output configuration in which emergency power is supplied within a short time from a voice output section (speaker output configuration) provided at a proper place during a power failure.

Then, as a result of earnestly researching to solve the above problems, the inventor has made the invention of claim 1 a gas engine for a small LPG having a displacement of 50 cc to 500 cc and a direct current for generating power by starting the gas engine. The engine includes a generator, an engine control unit having an engine battery, a plurality of on/off switches, and a general control unit for controlling the on/off switches, and the gas engine cylinder has two spark plugs. The first spark plug, the intake valve, the second spark plug, and the exhaust valve are provided around the cylinder, and the intake air from the intake valve is planar in the cylinder. In view of the above, it is configured so as to flow in a tangential direction or a direction close to a tangential line, and in a normal state, the power supply side of the commercial power source is energized via the ON/OFF switch, and From the moment the commercial power is lost due to an accident or the like, the engine battery and the engine control unit start the gas engine having the above-described configuration within about one or two minutes, and the direct-current generator causes the starting power to start. power, and the while the direct current power generated by the gas engine is converted into AC power to supply power to the power supply side, the gas engine only both of the commercial power source continues to be powered by the power up time of returning of the commercial power source As for the time until restoration, a single cylinder filled with 20 kg of propane can supply 1 kW of electric power for at least 72 hours by the electric power of only the gas engine. With the electric power of the gas engine at the time of the accident. The above problem is solved by providing a simplified emergency power supply device characterized by providing a charging action to the engine battery even with normal power.

According to a second aspect of the present invention, in the simplified emergency power supply device according to the first or second aspect, the intake valve, the first spark plug, the exhaust valve, and the second spark plug of the gas engine are 4 The above problem was solved by using a simple type emergency power supply device characterized by being arranged in equal parts. According to a third aspect of the present invention, in the simplified emergency power supply device according to the first or second aspect, the main stream of the air-fuel mixture that has flowed into the cylinder of the gas engine does not directly hit the ignition point of the spark plug, and The above-mentioned problem was solved by using a simple type emergency power supply device characterized by being configured to flow in the vicinity.

According to a fourth aspect of the present invention, in the simple type emergency power supply device according to the third aspect, the lower surface of the flat spherical concave surface is formed while the lower surface of the cylinder head of the cylinder of the gas engine is formed into the flat spherical concave surface. The swelling portion is provided on the front side of one of the spark plugs and on the downstream side of the air-fuel mixture, thereby providing a simple type emergency power supply device. Solved the problem. According to a fifth aspect of the present invention, in the simple type emergency power supply device according to the first, second, third or fourth aspect, a flywheel is provided between the gas engine and the DC generator. The above problems have been solved by using the simple type emergency power supply device.

The invention of claim 6 is the simplified emergency power supply device according to claim 1, 2, 3, 4 or 5, wherein a plurality of the on/off switches are turned on/off by a signal from the general control unit. The above problem is solved by using a simple type emergency power supply device characterized in that the power is supplied from the engine battery having a low voltage equivalent to that of the engine control unit. According to a seventh aspect of the present invention, in the simplified emergency power supply device according to the first, second, third, fourth, fifth or sixth aspect, the on/off switch is an on/off relay switch. The above problem is solved by using the simple type emergency power supply device.

According to the invention of claim 1, the present invention can satisfactorily deal with the case where the commercial power supply is lost a plurality of times due to a great disaster or the like. According to the present invention, even if the power failure cannot be dealt with instantaneously (only about several tens of seconds are in the power failure state), even if the power failure lasts from 1 day to 3 days, the power generation of the DC generator by the gas engine is sufficient. In particular, even if the commercial power supply is lost multiple times due to a disaster (such as the Great Kumamoto Earthquake), a part of the electric power is used to replenish the electric energy that was previously consumed. It has the advantage of being able to fully cope with a power failure. In addition, as an effect of LPG, it exists everywhere in Japan, and extremely efficient support and restoration can be made possible in an emergency.

According to the inventions of claims 2 to 4, in particular, the combustion efficiency can be increased and the startup of the gas engine can be favorably performed. According to the fifth aspect of the invention, the engine stalling can be prevented. According to the invention of claim 6, control can be performed easily and surely. According to the invention of claim 7, the relay device can be provided at a low cost with a simple structure.

It is a normal-time block diagram of the present invention when electric power is normally supplied from a main power source such as an electric power company or a private power generator. It is a block diagram of a state when the gas engine is operating in an emergency and electric power is stably supplied from the DC generator. It is a chart showing a flow of the present invention. 6 is a chart showing a control characteristic of a throttle opening for a sudden increase in electric load. (A) is a plan view of a single cylinder part, (B) is an enlarged sectional view taken along the line Y1-NOX of (A), and (C) is an enlarged sectional view taken along the line Y2-Y2 of (A). is there. It is an expansion state perspective view showing a partial section of a single cylinder part. FIG. 4 is a normal configuration diagram of the present invention when power is normally supplied from a main power source such as an electric power company or a private power generator, and in particular, is a diagram illustrating a voice output by providing a voice output unit. FIG. 4 is a configuration diagram of a state in which the gas engine is operating and electric power is being stably supplied from the AC generator in an emergency, and particularly, is a diagram illustrating a voice output by providing a voice output unit. It is a flowchart figure of the audio|voice output part circuit built in in this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 3 are state diagrams showing a configuration diagram and an operation of the present invention. FIG. 1 is a configuration diagram in a normal state, and FIG. 2 is an operation state diagram in an emergency. In these figures, if single-phase alternating current or direct current originally requires two wirings, if three-phase alternating current, three wirings are required, but to make the drawings easier to see, one line is representative and the connection relationship is shown. I will represent it.

FIG. 1 shows a state in which commercial power is supplied from a private power generation facility such as a power plant, a factory, or a ship during normal times. As a main configuration of the present invention, a small gas engine 1, a DC generator 3 for generating power by starting the gas engine 1, a plurality of on/off switches, and a general control unit for controlling the on/off switches. 61 (also referred to as “TCU”), an engine control unit 62 (also referred to as “ECU”) supplied from the low-voltage engine battery 5, and the like are provided.

Here, although the total control unit (TCU) 61 and the engine control unit (ECU) 62 cooperate with each other, the function sharing will be described. The total control unit (TCU) 61 monitors whether or not the commercial power source is lost, turns on/off the on/off switch, and sends a signal for starting and stopping the gas engine 1 to the engine control unit (ECU) 62. In addition to this, control of the electric output system such as control of the exciting current of the DC generator 3 described in FIG. 4 is performed.

On the other hand, an engine control unit (ECU) 62 performs fuel supply to the gas engine, ignition timing and throttle opening/closing control, start/stop of the gas engine 1, water temperature control, and the like. The electric power of the total control unit (TCU) 61 is supplied from the engine battery 5 of the same low voltage as the engine control unit (ECU) 62.

In FIG. 1, a power generator including a gas engine 1, a fuel supply device 2, and a DC generator 3, and a gas cylinder 29 for liquefied petroleum gas (LPG) is used as fuel. Since it is a small-sized emergency power source, the gas engine 1 has a small displacement of about 50 cc to about 500 cc or less. The gas engine 1 is a multi-point ignition engine in which two ignition plugs are arranged in one cylinder. This shortens the engine start time, increases the chances of ignition, and realizes rapid combustion to improve thermal efficiency (fuel consumption).

In the gas engine 1, a cylinder head 12 is provided above a cylinder 11 in which a piston 10 is vertically movable, and the lower surface of the cylinder head 12 is formed as a flat spherical concave surface 12a. Two spark plugs 13, an intake valve 15, and an exhaust valve 17 are provided when seen in a plan view from the upper surface side of the cylinder head 12 (or the cylinder 11). The intake valve 15, the spark plug 13, the exhaust valve 17, and the spark plug 13 are circumferentially divided into four equal parts (see FIG. 5(A)).

The radius of curvature R of the flat spherical concave surface 12a is located at an arbitrary point P on the central axis n of the cylinder 11. Further, the central axes m of the two spark plugs 13, the central axis w of the intake valve 15 and the central axis u of the exhaust valve 17 are configured to pass on the point P, respectively. That is, both the central axis m of the spark plug 13, the central axis w of the intake valve 15 (the inlet portion of the intake port 14) and the central axis u of the exhaust valve 17 (the outlet portion of the exhaust port 16) have a radius of curvature R. It exists on the normal line of the spherical surface of the flat spherical concave surface 12a. Such a three-dimensional combustion chamber is configured [see FIG. 5(B)].

In particular, in the intake port 14 that allows the intake valve 15 to intake air, the intake air from the intake valve 15 flows into the cylinder 11 from a tangential direction or a direction close to the tangential line when the cylinder 11 is viewed in a plan view and swirls. (Swirl G). This swirl S (vortex) is generated when the piston 10 in the cylinder 11 descends [see FIG. 5(B) and FIG. 6].

The directionality may be secured even in the swirl S (vortex). In order to secure sufficient directionality, the following configuration is often adopted. In particular, a bulging portion 12b having a substantially crescent shape or a trapezoidal mountain shape is provided on the lower surface of the flat spherical concave surface 12a on the front side of one spark plug 13 and downstream of the swirl S (vortex flow). It is provided so as to be on the side. The details of the swirl S (vortex) will be described in detail so that the main flow of the swirl S (vortex) does not hit the ignition point of the spark plug 13 directly and flows in the vicinity thereof (FIG. 5(A)). reference〕.

The bulging portion 12b has a substantially crescent shape and a substantially vertical cross section (see FIGS. 5A and 5B) and functions to change the flow of the swirl S (vortex flow). Yes, the highest height may be around 1 mm. The swirl S (vortex flow) may cause a small turbulent state even at the bulging portion 12b. Also, the bulging portion 12b is formed in the same shape as the crescent-type bulging portion 12b described above even if the bulging portion 12b is formed into a trapezoidal mountain shape in which Mt. Produce the effect of. Further, the bulging portion 12b is not limited to the shape as long as it can change the directionality of the swirl S (vortex).

Further, in FIGS. 5A and 5B, it is preferable that the flow rate of the mainstream versus the anti-mainstream is about 8:2. Due to the existence of the anti-main flow, turbulence of the air flow is generated, and mixing can be improved and gas (LPG) combustion can be further promoted. Such a configuration is a great advantage that does not exist in the past. In particular, as shown in FIG. 6, the main flow in the swirl S (vortex flow) receives a counter main flow in the cylinder 11 and gradually decreases in speed, and at the same time, exhibits a fine turbulent state. That is, the air that is a gas (air) and the LPG that is a gas can be naturally integrated.

If the strong swirl S (vortex) main stream hits the ignition point (spark gap) of the spark plug 13 directly, the temperature of this portion decreases (for example, 450° C. or less), free carbon is generated, and the tip is polluted. As a result, the sparks are less likely to fly, but new air-fuel mixture is allowed to flow into the ignition point (spark gap) while avoiding a direct hit at this tip. Once the fire is generated, the swirl S (vortex) causes the flame to spread extremely rapidly in a three-dimensional manner into the combustion space (the entire space defined by the cylinder head 12, the inner wall surface of the cylinder 11 and the top surface of the piston 10). The combustion efficiency of gas can be significantly increased.

This combustion efficiency is extremely good in combination with the three-dimensional combustion chamber as the spherical surface of the flat spherical concave surface 12a having the radius of curvature R and the swirl S (vortex) avoiding the ignition point of the ignition plug 13. Has the effect. Furthermore, there is the greatest advantage that the start of the gas engine 1 immediately after a power failure can be started up very early.
The angle θ between the central axis m of the spark plug 13 and the central axis n of the cylinder 11, the angle θ between the central axis w of the intake valve 15 and the central axis n of the cylinder 11, and the exhaust valve 17 The angle θ between the center axis u of the cylinder 11 and the center axis n of the cylinder 11 is also the same, and is about 12° to about 14° [see FIG. 5(B)].

The gas cylinder 29 is provided with a decompression valve 28, from which a supply pipe 25 is arranged, and the other end of the supply pipe 25 is inside a venturi 19a of a mixer 19 continuous with the intake duct 18 before the intake port 12. It is configured to communicate. The LPG flows into the gas pipe 25 through the solenoid valve 27 and the pressure regulating valve 26 into the intake port 12, and finally is jetted by appropriately opening the throttle 20 by the throttle actuator 21. That is, as shown in FIGS. 1 and 6, the fuel supply device 2 includes the rottle 20, the throttle actuator 21, the gas pipe 25, the pressure regulating valve 26, the electromagnetic valve 27, the pressure reducing valve 28, the gas cylinder 29, and the like. It is configured.

Further, the fuel injection point will be described. The fuel (LPG) is depressurized to near atmospheric pressure by the pressure regulating valve 26, measured by the orifice 25a, and guided to the fuel passage in the mixer 19. It is adjusted by the slit step hole 22 of the venturi 19a and the idle mixing screw 23, and is mixed with the air sucked from the downstream of the throttle 20. Fuel is supplied downstream of the throttle 20 during idling, and mainly through the slit step hole 22 during transition or low speed. When the required output of the gas engine 1 becomes large, fuel is mainly sucked out from the slit of the venturi 19a.

As described above, as the fuel, liquefied petroleum gas (LPG), which is easily available, is filled in the gas cylinder 29, and is convenient for transportation, is used. The LPG has an advantage that it does not deteriorate like gasoline and light oil even when stored for a long period of time. Further, it has the advantages that the starting time is shorter and the emission of carbon dioxide and nitrogen oxides is smaller than that of the compression ignition diesel engine that uses light oil as fuel. As shown in FIG. 1, reference numeral 44 is a radiator and 45 is a fan motor.

Further, in the daily life of FIG. 1, the engine battery 5 is converted into a low-voltage (for example, 12V) direct current by the AC→DC inverter 72 to perform charging work (see a broken line). As the engine battery 5, a 12V lead/dilute sulfuric acid battery for an automobile is often used.

In the state shown in FIG. 1, since the electric power from the DC generator 3 is not used, the on/off switch 82 of this circuit remains in the open position. The state of the commercial power source (whether or not electricity is supplied) is configured to be determined by the voltage applied to the total control unit (TCU) 61 from the junction point P1 through the fixed resistor 85, the main power source signal line 86. This is because the presence of the fixed resistor 85 makes it possible to determine whether the total control unit (TCU) 61 has a power failure with a weak current. If the main power supply (commercial power supply) is lost, this voltage becomes zero if there is a resistance in the total control unit (TCU) 61 and the voltage around this is monitored.

In normal times, as shown in FIG. 1, the on/off switch 81 is closed, and the electric power from the main power source is output from the junction point P1 through the junction point P2 as indicated by the thick arrow. The on/off switch 81 has a function of turning on/off the circuit by a signal from the total control unit (TCU) 61. The switch may be a contactless switch using a transistor, which may be opened or closed electromagnetically.

Next, the operation description in an emergency will be described based on FIG. When it is detected that the commercial power supply is lost due to some accident or the like, in FIG. 1, the on/off switch 81 is opened by the operation of the total control unit (TCU) 61, and the commercial power supply becomes a blackout (blackout). Become. From this moment, the features of the present invention when the gas engine 1 generates electric power and continuously supplies electric power for a long time will be described. Before that, the process until the gas engine 1 is started will be described. First, when the total control unit (TCU) 61 detects the loss of the commercial power supply (main power supply), the signal is transmitted from the total control unit (TCU) 61 to the engine control unit (ECU) 62.

A signal from the engine control unit (ECU) 62 causes the starter relay 42 to drive the starter motor 41 with the power source of the engine battery (12V) 52. At the same time, a signal from the engine control unit (ECU) 62 energizes and opens the electromagnetic valve 27 that shuts off the gas coming from the gas cylinder 29 (for LPG) through the mechanical decompression valve 28 that is normally used.

At the same time, the pressure adjusting valve 26 that adjusts the pressure of the fuel to almost atmospheric pressure is activated, and the fuel is ready to be supplied to the fuel supply device 2 of the gas engine 1. On the other hand, the supply of engine oil, which is indispensable for the operation of the gas engine 1, is circulated by the electric oil pump 46 and the cooling water is also circulated by the electric water pump 47.

When the starter motor 41 rotates, the gas engine 1 is cranked, and the fuel and air measured by the fuel supply device 2 are sucked by the negative pressure generated by the suction, compressed, ignited, and started. This startability is significantly superior to that of a diesel engine because of multipoint ignition (two spark plugs 13 are provided) and gas fuel.

When the gas engine 1 starts and reaches the rated speed, and power can be supplied from the DC generator 3 rotating at the same speed as the rated speed, the on/off switch 82 is switched to the closed state. Here, the rotation speed of the gas engine 1 is calculated by counting the top dead center signal for ignition timing control detected by the crank rotation sensor 48. The opening of the throttle 20 of the fuel supply device 2 is adjusted by a signal from the engine control unit (ECU) 62 so that this becomes a predetermined rotation speed, for example, 2000 rpm.

The on/off switch 81 remains open, but the on/off switch 82 is closed. The direct current from the direct current generator 3 is converted by the direct current to alternating current inverter 71 into alternating current having the same alternating current power and frequency as the main power source, and is output from the junction point P2 via the on/off switch 82. At this time, the DC power of the DC generator 3 of the gas engine 1 is converted from the junction P2 to a low-voltage DC by the power conditioner 72, and the engine battery 5 is also charged.

When the temperature of the cooling water rises during the operation of the gas engine 1, the thermostat 43 opens and the cooling water circulates in the radiator 44. Further, when the water temperature rises, the fan motor 45 is energized to accelerate the heat radiation from the radiator 44 by the cooling air.

Next, fuel consumption and energy generated by the fuel consumption will be described. As an example, it is assumed that the gas cylinder 29 is a cylinder filled with 20 kg of propane C ₃ H ₈ . C ₃ H _{8 has} a molecular weight of 44, that is, 1 mol, and a standard state (0° C., 1 atm) of 22.4 liters has a mass of 44. On the other hand, the low calorific value of propane (hereinafter abbreviated as calorific value) in the standard state is 90.7 MJ/m ³ .

The mass of 1 m ³ of C ₃ H ₈ is 44 g×1000/22.4=1964 g. Therefore, a 20 kg cylinder is filled with (20 kg)/(1.964 kg/m ³ )=10.18 m ³ of propane in the standard state. The calorific value is 90.7MJ/m ³ ×10.18m ³ =923MJ (=923×10 ³ kJ). The electric energy that can be generated with this amount of heat is calculated, and it is examined whether 1kW can be supplied for 72 hours.

The thermal efficiency stably obtained by the multi-point ignition engine rotating at a low speed with a small friction loss is 36%. The efficiency of the generator is 95%, and the conversion efficiency of the DC→AC inverter 71 is 93%. Further, assuming that the maximum output of 1 kW is continuously output from the junction point P2, the energy consumed by the engine is (1 kJ/s)/(0.36×0.95×0.93)=3.1441 kJ/s. The time required to consume 923×10 ³ kJ is (923×10 ³ kJ)/(3.144 kJ/s)≈293600 s, that is, about 81.5 hours. It is possible to generate electricity for more than 81 hours with a single 20 kg cylinder, and it is possible to achieve the target of 72 hours with sufficient margin.

When the commercial power source (main power source) is restored, the general control unit (TCU) 61 is aware of this, and opens the on/off switch 82 and closes the on/off switch 81 to change from junction point P1 to junction 2. Mains power is supplied. Further, the engine control unit (ECU) 62 closes the electromagnetic valve 27 at the same time as stopping the engine to shut off the fuel. Then, the state returns to that of FIG.

As described above, the electric power is blacked out from the moment when the commercial power source is lost due to some accident or the like, but the electric power is supplied from the AC generator 3 which rotates when the gas engine 1 of the present invention starts and reaches the rated speed. It only takes a short time (about 10 to about 40 seconds) before it can be supplied. Only such a short time (step b in FIG. 3) is blacked out, and thereafter, the maximum amount of 2-3 days until the commercial power is restored is covered by the power from the DC generator 3. It is an excellent invention that can be achieved.

Such supply power will be described with reference to a flow chart (see FIG. 3). The power from the commercial power source is represented by step a, the blackout time is represented by step b, and the power generated by the gas engine 1 is represented by step c. There is. In FIG. 3, blackout occurs twice and power is supplied from the gas engine 1 each time. Actually, the blackout time is about 10 to about 40 seconds. Only at this time, if a small UPS (uninterruptible power supply) is used to take measures against electronic equipment such as a PC, a large-capacity traffic signal is produced. The electric power supply of the gas engine 1 of the present invention can be sufficiently used as the power source of the store and the store.

It is assumed that the required electric output suddenly increases when the gas engine 1 is rotating at a rated speed with an output lower than a predetermined output. The engine speed decreases as the load increases. In order to recover this, the throttle of the fuel supply device 2 is opened by a signal from the engine control unit (ECU) 62, but it takes a short time but a certain amount of time to return to the predetermined rotation speed.

A small engine with a small output reserve cannot counter this, and the output voltage at the junction point P2 may drop, or in extreme cases, the gas engine 1 may stop. It is also necessary for the gas engine itself to be able to cope with a sudden increase in load even with a small engine. A flywheel 9 may be provided as such means.

As its structure, as shown in FIGS. 1 and 2, a flywheel 9 having a thick outer peripheral portion on the outer periphery is fixed to an end portion of a crankshaft of the gas engine 1 with fastening bolts. Further, a male spline 35 provided at the center of the DC generator 3 is fitted and fixed to a female spline in a boss portion formed at the center of the flywheel 9. It has a very simple structure.

If the rotational moment of inertia Ip (unit: kgm ² ) is large, the downward rotation becomes slow. Immediately after the plunge, the engine speed is higher than the conventional type. If it is high, the number of times of suction is large, so that the time required to fill the inside of the cylinder 1 from the mixer becomes short. Then, the amount of the air-fuel mixture supplied during that time increases. A large amount of heat energy is generated, that is, it blows up strongly. The magnitude of the rotational moment of inertia Ip is 1.2kgm ² ~1.0kgm ² at engine 100Cc～300cc, is substantially the same size as the spark ignition engine of 4 cylinder 2000Cc～3500cc.

Further, comparing the graph of the present invention in which the flywheel 9 is provided with the related art, in the related art, when a sudden electric load is generated in the gas engine 1 in an emergency, the engine speed decreases and the engine stall occurs. The rise is lowered to the limit, and the convergence (convergence) is slow, but the convergence (convergence) time by the start-up of the present invention is about half, and there is an advantage that it is possible to make the configuration extremely hard to stall.

In the DC generator 3, a commutator 32 is provided on a rotor 31 directly connected to the flywheel 9 from the gas engine 1, and a brush 34 is attached to the commutator 32 so that the brush 34 can come into contact therewith. The rotor 31 is provided with a stator coil 33. As a result, the rotor 28 of the DC generator rotates at the same speed as the rotation of the gas engine 1. The generated electric power is controlled by the exciting current supplied from the brush 34 to the commutator 32 and the rotor 31.

The total control unit (TCU) 61 supplies the electric current supplied from the engine control unit (ECU) 62 to the rotor 31 while controlling the exciting current. As a result, electric power having a predetermined voltage is generated in the stator coil 33. The DC power from the stator coil 33 is converted by the DC→AC inverter 71 into AC having the same voltage and frequency as the commercial power supply, and is output from the junction point P2 via the ON/OFF switch 82.

Here, when the electric load is large, the required torque of the gas engine 1 increases and the rotation speed decreases, so the throttle actuator 21 is operated by the signal from the engine control unit (ECU) 62 to increase the opening degree of the throttle 20. To maintain a predetermined rotation speed. When the number of rotations is too high, the opposite control is performed.

A description will be given of a measure for the case where the rotational energy of the flywheel 9 is insufficient for the sudden increase of the electric load. When the electric load suddenly increases, the voltage drops. Then, the rotation speed of the gas engine 1 also greatly decreases from a predetermined rotation speed Ne (for example, 2000 rpm). Then, the throttle 20 increases the opening degree in response to a signal from the engine control unit (ECU) 62, so that the rotation speed of the gas engine 1 reaches a predetermined rotation speed Ne. However, if it is left as it is, the voltage further rises, the generated voltage exceeds a predetermined value, and a runaway state may occur.

Therefore, the throttle opening control described with reference to FIG. 4 is performed. When the electric load increases from L1 to L2 at time T as shown in the lower part, the throttle opening β1 which has maintained the predetermined gas engine speed at the time of L1 is immediately changed to the flow throttle state as in the middle part. Then, as shown in the upper part, the gas engine speed once decreased to (1) starts to increase.

Then, in (2), the predetermined rotation speed Ne is reached. Therefore, as shown in the middle stage, the throttle opening is gradually closed, for example, by 5% per second, or stepwise by 5% every second. As a result, the increase in the gas engine rotational speed slows down and begins to decrease. At the moment when it goes down to Ne in (2), it will gradually open 4% per second or stepwise 4%. When it reaches (4), it closes by 3%. When this is repeated, the throttle opening converges to a predetermined rotation speed (for example, 1800 rpm). Needless to say, it may be changed depending on the actual situation instead of the 5% or 4%.

When the electric load gradually increases, the rotation speed of the gas engine 1 gradually decreases. Therefore, the engine control is performed so that the rotation speed detected by the crank rotation sensor 48 does not suddenly reach the full throttle and the predetermined rotation speed is maintained. The throttle 20 is opened by a signal from the unit (ECU) 62. When the rotation speed of the gas engine 1 gradually rises, the reverse is done, and a signal from the engine control unit (ECU) 62 is outputted so that the rotation speed detected by the crank rotation sensor 48 maintains a predetermined rotation speed. Then, the throttle 20 is closed.

When the total control unit (TCU) 61 detects the return of the commercial power source, the total control unit (TCU) 61 sends a signal for stopping the gas engine 1 to the engine control unit (ECU) 62 and turns on the emergency power system. The off switch 82 is turned off and the on/off switch 81 is turned on at the same time. On the other hand, the engine control unit (ECU) 62 cuts off the ignition, the throttle actuator 21 closes the throttle 20, and the solenoid valve 27 is closed. With this, the commercial power source passes through the device from the junction P1 and is output from the junction P2. Even if the ignition cut is momentarily delayed for some reason, if the rotational inertia moment of the flywheel 9 is set to a large value as described above, the rotation will not be excessively increased and the gas engine will not be destroyed.

Each of the on/off switches 81 and 82 may be configured as an on/off relay switch. These relay switches are ordinary contactless switches that use semiconductors even if their contacts are opened and closed electromagnetically. Mainly due to economy. Further, the table of FIG. 4 particularly shows the features of the present invention.

That is, even if the power outage and the recovery continue at a predetermined time interval (from 1 day to 3 days), the engine battery 5 is charged even in the emergency. Such a configuration is the greatest advantage that has not existed in the past. For example, recently, the present invention can sufficiently cope with a case where the seismic intensity 7 continues twice within 24 hours due to the Kumamoto earthquake.

Generally, when the throttle 20 which is a known technique is appropriately opened, the LPG flows into the intake duct 18 from the orifice 18a, but it is as if tap water simply flows in, and the LPG is also gas. Air is in a situation where it is difficult to mix, and the air-fuel mixture in which the LPG and the air are mixed is satisfactorily mixed with the air due to the swirl S phenomenon in the cylinder 11 as described above. Thus, the gas engine 1 having good combustion efficiency can be provided.

The simplified emergency power supply device of the present invention is provided with a built-in audio output circuit. Specifically, as shown in FIGS. 7 and 8, a sound output unit 63 is incorporated inside the total control unit (TCU) 61. Further, when the device of the present invention is installed outdoors or the like, an audio output section 63 is provided at an appropriate place indoors away from the total control unit (TCU) 61 and incorporated in the TCU 61. The audio output unit 63 may be output from a computer or may have a built-in speaker.

The output of the built-in audio output circuit is connected to the engine battery 5 that is constantly charged in normal and emergency situations, and this output can be output as audio information under the control of the total control unit (TCU) 61. Is configured. First, even if there is a sudden power failure (blackout state) in an emergency, this device is an invention that enables power generation by the gas engine 1 in about 1 or 2 minutes. It provides a feeling.

In other words, it is configured to reassure the person who feels the greatest anxiety during a sudden power failure within a few minutes by voice output (preferably several times). In particular, the simplified emergency power that produces a great safety and security effect by the cooperation of the hardware configuration that lights up within a few minutes and the software configuration that maintains a sense of security even if the configuration is simple. A supply device can be provided.

As an emergency flowchart, as shown in FIG. 9, the gas engine 1 is ready for starting at the moment of a power failure (S1). That is, the engine is ready to start (S2). At the same time, the first sound is output from the sound output unit 63 inside the total control unit (TCU) 61 or indoors (S3). For example, "Please be relieved. The engine generator will operate."

Then, after several seconds, the preparation of the gas engine 1 is completed (S4). Simultaneously with the completion of this preparation, the voice output section 63 outputs the second voice (S5). For example, "The engine will be started." Then, the starter motor 41 is rotated to start on the gas engine 1 (S6).

This starts the gas engine 1 (S7). When the gas engine 1 is started and reaches the rated speed, the AC generator 3 is ready to supply electric power. Then, the voice output unit 63 outputs the third voice (S8). For example, "power is started." This state diagram is shown in FIG. Then, energization is started (S9).

In this way, the generator of the gas engine 1 supplies electric power in an emergency. Specifically, the total time of a series of operations from S1 to S9 power supply at the time of power failure is about 1 or 2 minutes. When a power failure occurs and the machine operates, there is no problem when the power failure is short, but if the power failure lasts for 10 hours, the fuel supply and the inspection are performed. Therefore, the system of the present invention is reset at this time as well.

Further, in the present invention, even during normal time (when there is no power failure), after a certain period of time, for example, every six months or every other year, the presence of the emergency generator and the regular inspection information of this device are announced. It is designed to give you a sense of security. In this concrete configuration, the timing in time is controlled by the signal of the timer built in the total control unit (TCU) 61.

As a flowchart in the normal state, as shown in FIG. 9, after a predetermined time has passed (half a year or a year later) (S10), an announcement is made (S11). The most important item of this announcement is the notification of the existence of the emergency power supply device. For example, the output is "Emergency generator is installed in this building." Even with this, it can be sufficiently output that the building has a crisis management function.

In addition, regular inspection information can be output as a subsequent announcement. For example, the message "Regular inspection/maintenance is recommended at this time" is output. The importance of this information output is that it is possible to perform comprehensive crisis management by integrating the management information of the building owner with the user.
It should be noted that when the periodic inspection and maintenance are completed, the system of the present invention is reset, and the suit is started from zero time. The engine start-up inspection is always performed during regular inspections and maintenance, so it may be reset with the starter signal.

1... Gas engine, 11... Cylinder, 12... Cylinder head, 13... Spark plug,
15... Intake valve, 17... Exhaust valve, 12a... Flat spherical concave surface, 12a... Swelling portion,
2... Fuel supply device, 3... Alternator, 5... Engine battery,
61... Total control unit (TCU),
62... Engine control unit (ECU), 63... Voice output section,
81, 82... ON/OFF switch, 9... Flywheel.

Claims (7)

A small gas engine for LPG with a displacement of 50cc to 500cc, a DC generator that generates power by starting the gas engine, an engine control unit having an engine battery, a plurality of on/off switches, and the on/off With a comprehensive control unit that controls the switch,
The cylinder of the gas engine is provided with two spark plugs, and the first spark plug, the intake valve, the second spark plug, and the exhaust valve are arranged around the circumference in a plan view of the cylinder. Further, the intake air from the intake valve is configured to flow in a tangential direction or a direction close to the tangent line when viewed in plan in the cylinder,
In normal times, the power supply side of the commercial power supply is energized through the on/off switch, and the engine battery and the engine control unit are operated from the moment the commercial power is lost due to some accident or the like. The gas engine configured as described above is started within about one or two minutes, and the DC power is generated by the DC generator by the starting force, and the DC power generated by the gas engine is converted to AC power while being supplied to the power supply side. feeding to the commercial power source at least 72 hours of power 1KW propane 20kg as the time until the return of the commercial power source together and hold to power is a single cylinder of the already filled with the return of only the gas engine until power Will be able to supply power only from the gas engine,
A simple type emergency power supply device, characterized in that a charging action is provided to the engine battery regardless of whether the gas engine powers at the time of the accident or the normal power level. The simplified emergency power supply device according to claim 1, wherein the intake valve, the first spark plug, the exhaust valve, and the second spark plug of the gas engine are arranged in four equal parts. Simple type emergency power supply device characterized by. The simplified emergency power supply system according to claim 1 or 2, wherein the main flow of the air-fuel mixture that has flowed into the cylinder of the gas engine does not hit the ignition point of the spark plug directly but also flows in the vicinity thereof. A simple type emergency power supply device characterized by the following. The simplified emergency power supply device according to claim 3, wherein the lower surface of the cylinder head of the cylinder upper part of the gas engine is formed into a flat spherical concave surface, and the bulge portion is formed on the lower surface of the flat spherical concave surface. A simple type emergency power supply device, which is provided on the front side of the individual spark plugs and on the downstream side of the air-fuel mixture. The simplified emergency power supply apparatus according to claim 1, 2, 3 or 4, wherein a flywheel is provided between the gas engine and the DC generator. Supply device. The simplified emergency power supply device according to claim 1, 2, 3, 4 or 5, wherein a plurality of the on/off switches are turned on/off by a signal from the general control unit, and the power is engine control. A simple type emergency power supply device, characterized in that power is supplied from the engine battery having a low voltage equivalent to that of a unit. The simplified emergency power supply apparatus according to claim 1, 2, 3, 4, 5 or 6, wherein the on/off switch is an on/off relay switch. ..

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