JP6762498B2 - Simple emergency power supply device - Google Patents

Description

The present invention can use a small to medium-sized gas engine and a DC generator to supply emergency power with high efficiency even if power outages occur intermittently multiple times or many times, and at the same time as a power outage. The present invention relates to a simple emergency power supply device having an audio output configuration (speaker output configuration) in which emergency power is supplied within a few minutes from the audio output unit provided in the above.

There are two types of small to medium-sized emergency power supply devices (uninterruptible power supply, etc.) used for households and signs in case of a power outage of less than 25 kW in preparation for a disaster, such as a storage battery type and an engine. The storage battery has advantages such as a short time from a power failure to lighting and a simple operation, but has a large disadvantage that the mass is increased.

For example, 1kW of electricity can be used for 72 hours (there is a prospect of restoration of infrastructure destroyed by a disaster 3)
Find the mass of the storage battery when supplying it (for days). Since 1kW is 1kJ / s, in 72 hours, 1kJ / s x 72 x 3600s = 259200kJ. However, since the storage battery is direct current, assuming that the efficiency of the inverter that converts this to alternating current is 93%, the storage battery must store at least 259200kJ / 0.93 = 278710kJ (≈2797MJ) of electrical energy. Even a lithium-ion battery with a large energy density (electrical energy per unit mass) is at most 100 Wh / kg, so 100 J / s x 3600 s = 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, power generation by an engine can generate power as long as fuel continues, but it takes several tens of seconds to start the engine and supply stable electric output, and power outages will continue during this period. Furthermore, as described above, small to medium-sized devices have little spare capacity, so if the required power (electrical load) suddenly increases, the engine speed will drop and the power supply will not be able to keep up, or the engine will stop. It may end up. In this way, both the storage battery type and the engine generator had a big problem.

Further, as an AC uninterruptible power supply, Patent Document 1 exists, but this document is not for commercial power supply, but is used in mountainous areas, remote islands, etc., and in particular, frequency reduction is controlled by an inverter. Although the engine generator is used in this device, the type of the engine is unknown, and it is not always an excellent engine generator.

Further, in Patent Document 2, the storage battery and the engine are uninterruptible power supplies, but the capacity of the storage battery is reduced so that the engine can supply power. However, in particular, due to a major disaster or the like, the power supply may be performed multiple times. Over the years, when the commercial power supply was lost, Reference Document 2 could not 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. Furthermore, in the event of a power outage, there is a simple emergency power supply device equipped with an audio output configuration that supplies emergency power within a short time from the audio output unit (speaker output configuration) provided at the same time as the power outage. There wasn't.

Japanese Unexamined Patent Publication No. 5-207684 Japanese Unexamined Patent Publication No. 2001-45681

Even if the problem (technical problem or purpose, etc.) to be solved by the present invention cannot be dealt with instantly at the time of a power failure, the gas engine continues to generate electric power about several minutes after the power failure, and the power is continuously supplied during the power failure. Even if it lasts for about 1 to 3 days (large-scale disaster, such as the Great Tohoku Earthquake of 3.11), small to medium-sized vehicles that easily supply power not only to households but also to traffic lights, various signs, surveillance cameras, etc. Provide an emergency power supply device. In particular, it is to realize sufficient response even if the commercial power supply is lost multiple times (such as the Kumamoto Great Earthquake) due to a disaster or the like. Furthermore, we would like to realize the existence of an emergency power supply device having an audio output configuration in which emergency power is supplied within a short time from an audio output unit (speaker output configuration) provided at an appropriate position in the event of a power failure.

Therefore, as a result of diligent research to solve the above problems, the inventor has made the invention of claim 1 by using a gas engine for small to medium-sized LPG with a displacement of more than 500 cc to 5000 cc and starting the gas engine. It is equipped with a DC generator for generating power, an engine control unit having an engine battery, a plurality of on / off switches, and a comprehensive control unit for controlling the on / off switches, and the cylinder of the gas engine has two. An ignition plug is provided, and the first ignition plug, the intake valve, the second ignition plug, and the exhaust valve are arranged around the cylinder when the cylinder is viewed in a plane, and the intake air from the intake valve is the cylinder. When the inside is viewed in a plane, it is configured to flow in in the tangential direction or the direction close to the tangent line, and in the normal state, the power supply side of the commercial power supply is energized via the on / off switch. From the moment the commercial power supply is lost due to some accident or the like, the engine battery and the engine control unit start the gas engine having the above-described configuration within about 1 to 2 minutes, and the DC power generation is performed by the starting force. and power generation by machine, the while the direct current power generated by the gas engine is converted into AC power to supply power to the power supply side, both when continuously feeding at the commercial power source only the gas engine until restoration of power the As the time until the commercial power is restored, one cylinder filled with 20 kg of propane can supply 1 KW of electric power for at least 72 hours with the electric power of the gas engine only, and the gas engine at the time of the accident can supply the electric power. The problem is solved by using a simple emergency power supply device characterized by providing a charging action to the engine battery regardless of whether it is electric power or normal electric power. Is.

According to the invention of claim 2, in the simplified emergency power supply device according to claim 1, the intake valve, the first spark plug, the exhaust valve, and the second spark plug of the gas engine are 4 and the like. The above-mentioned problems have been solved by using a simple emergency power supply device characterized by being arranged in minutes. According to the invention of claim 3, in the simplified emergency power supply device according to claim 1 or 2, the mainstream of the air-fuel mixture flowing into the cylinder of the gas engine does not directly hit the ignition point of the spark plug. The above-mentioned problems have been solved by using a simple emergency power supply device characterized in that it is configured to flow in the vicinity thereof.

According to the invention of claim 4, in the simplified emergency power supply device according to claim 3, the lower surface of the cylinder head of the upper part of the cylinder of the gas engine is formed into a flat spherical concave surface, and the lower surface surface of the flat spherical concave surface. In addition, the simplified emergency power supply device is provided so that the bulging portion is provided on the front side of one spark plug and on the downstream side of the air-fuel mixture. Solved the problem. The invention of claim 5 is the simplified emergency power supply device according to claim 1, 2, 3 or 4, wherein the gas engine has a 4-cylinder in-line configuration. By doing so, the above-mentioned problem was solved. The invention of claim 6 is the simplified emergency power supply device according to claim 1, 2, 3, 4 or 6, wherein a flywheel is provided between the gas engine and the DC generator. The above-mentioned problem was solved by adopting a simple emergency power supply device characterized by the above.

According to the invention of claim 7, in the simplified emergency power supply device according to claim 1, 2, 3, 4, 5 or 6, a plurality of the on / off switches are turned on by a signal from the integrated control unit. The problem was solved by using a simple emergency power supply device that is turned off and the power is supplied from the engine battery having a low voltage equivalent to that of the engine control unit. The invention of claim 8 is the simplified emergency power supply device according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the simplified emergency power supply device according to claim 1, 2 or 3. The above problem is solved by using a simple emergency power supply device characterized in that the on / off switch is an on / off relay switch.

In the invention of claim 1, the present invention can satisfactorily deal with the loss of commercial power supply a plurality of times due to a catastrophe or the like. Further, in the present invention, even if it is not possible to respond instantly at the time of a power failure (only about several tens of seconds are in a power failure state), even if the power failure lasts for about 1 to 3 days, the power generation of the DC generator by the gas engine can be performed. In particular, even if the commercial power source is lost multiple times (such as the Great Kumamoto Earthquake) due to a disaster, etc., a part of that power will be used to replenish the electrical energy consumed earlier. It has the advantage of being able to cope with repeated power outages. In addition, the gas engine exists everywhere in Japan as an effect of using LPG, and it is possible to provide extremely efficient support and restoration in an emergency.

In the inventions of claims 2 to 5, the combustion efficiency can be increased and the start-up of the gas engine can be improved. In the invention of claim 6, the engine stall of the gas engine can be prevented. According to the invention of claim 7, control can be performed easily and reliably. The invention of claim 8 has an effect that the relay device can be provided at low cost with a simple configuration.

It is a block diagram at the time of a normal time of this invention when electric power is normally supplied from the main power source of an electric power company, a private power generator, and the like. It is a block diagram of the state when the gas engine operates and the electric power is stably supplied from the DC generator in an emergency. It is a chart which shows the flow of this invention. It is a figure which shows the control characteristic of the throttle opening of a rapid increase of an electric load. (A) is a plan view of a single cylinder portion, (B) is an enlarged cross-sectional view taken along the line Y1-N-OX of (A), and (C) is an enlarged cross-sectional view taken along the line Y2-Y2 of (A). is there. It is an enlarged state perspective view which shows a partial cross section of a single cylinder part. It is a top view of the main part of this invention which made in-line four cylinders. It is a phase diagram of the action state of the LPG inflow point. It is a normal configuration diagram of the present invention when electric power is normally supplied from a main power source of an electric power company or a private power generator, and in particular, it is a diagram illustrating an audio blowout by providing an audio output unit. It is a block diagram of the state when the gas engine operates and the electric power is stably supplied from the alternator in an emergency, and in particular, it is the figure which illustrated the voice blowout by providing the voice output part. It is a flowchart of the embedded audio output part circuit in this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 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, two wires are required for single-phase AC and DC, and three wires are required for three-phase AC. However, to make the figure easier to see, one line is used to represent the connection relationship. I will represent it.

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

Here, the integrated control unit (TCU) 61 and the engine control unit (ECU) 62 are linked to each other, but the division of functions will be described. The integrated control unit (TCU) 61 monitors whether or not the commercial power 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, the electric output system is controlled, such as the control of the exciting current of the DC generator 3 described with reference to FIG.

On the other hand, the 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 integrated control unit (TCU) 61 is supplied from the engine battery 5 having the same low voltage as that of the engine control unit (ECU) 62.

In FIG. 1, a power generation device 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 a fuel. Since it is a small to medium-sized emergency power supply, the gas engine 1 has a small to medium-sized displacement of more than about 500 cc to about 5000 cc. The gas engine 1 is a multi-point ignition engine in which two spark plugs are arranged in one cylinder. As a result, the starting time of the engine is shortened, the chance of ignition is increased, and rapid combustion is realized to improve the thermal efficiency (fuel efficiency).

In the gas engine 1, a cylinder head 12 is provided above a cylinder 11 in which a piston 10 is housed so as to be able to move up and down, 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 viewed in a plane 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 arranged around the circumference in 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 axis 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, 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 spherical normal line 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 for intake to the intake valve 15, 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 plane, and a vortex flows. It is configured to be (Swirl G). This swirl S (whirlpool) is generated when the piston 10 in the cylinder 11 is lowered [see FIGS. 5 (B) and 6].

Directionality may be ensured even in the swirl S (whirlpool). The following configuration is often used to ensure sufficient directionality. In particular, on the lower surface of the flat spherical concave surface 12a, a bulging portion 12b having a substantially crescent shape or a trapezoidal mountain shape is on the front side of one spark plug 13 and downstream of the swirl S (whirlpool). It is provided so as to be on the side. To elaborate on the contents of the swirl S (whirlpool), the mainstream of the swirl S (whirlpool) is configured so as not to directly hit the ignition point of the spark plug 13 and to flow in the vicinity thereof [FIG. 5 (A)). reference〕.

The bulging portion 12b has a substantially crescent shape and a substantially triangular vertical cross section [see FIGS. 5A and 5B], and functions to change the flow of the swirl S (whirlpool). Yes, the highest height may be around 1 mm. The swirl S (vortex flow) can also cause a small turbulent flow state at the bulging portion 12b. Further, the bulging portion 12b is the same as the above-mentioned crescent-type bulging portion 12b even if a trapezoidal mountain shape obtained by flattening Mt. Fuji or the trapezoidal mountain shape formed in half (not shown). Play the effect of. Further, the shape of the bulging portion 12b is not limited as long as the direction of the swirl S (whirlpool) can be changed.

Further, in FIGS. 5A and 5B, the flow rate of the mainstream vs. the anti-mainstream is preferably about 8: 2. Due to the presence of the anti-mainstream, turbulence of the airflow is generated, which can improve mixing and further promote gas (LPG) combustion. Such a configuration is a great advantage that does not exist in the past. In particular, as shown in FIG. 6, the main stream in the swirl S (whirlpool) exhibits a fine turbulent flow state in the cylinder 11 at the same time as the velocity gradually decreases due to the anti-mainstream. It is precisely that the gaseous air (air) and the gaseous LPG can be integrated together.

If the mainstream of a strong swirl S (whirlpool) hits the ignition point (spark gap) of the spark plug 13 directly, the temperature of this portion drops (for example, 450 ° C. or less), free carbon is generated, and the tip portion is soiled. This makes it difficult for sparks to fly, but while avoiding the direct hit of this tip, let the new air-fuel mixture flow into the ignition point (spark gap). Then, once ignited, the flame spreads three-dimensionally into the combustion space (the entire space partitioned by the cylinder head 12, the inner wall surface of the cylinder 11 and the top surface of the piston 10) due to the swirl S (whirlpool). The combustion efficiency of gas can be significantly increased.

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

In the above description, the gas engine 1 is a single cylinder, but the present invention often has a plurality of cylinders at about 2,000 cc or more. In FIG. 7, it is a 4-cylinder series type, and in such a case, it is divided into two in the middle of the intake act 18, and further divided into two at 14 intake ports in the cylinder head 12. Similar to the single cylinder configuration described above, each cylinder 1 has an end portion, and the intake air from the intake valve 15 looks at the cylinder 11 in a plane, and the cylinder 11 is tangential or close to the tangent. It is configured to flow in and become a vortex (swirl G). In FIG. 7, for example, a single cylinder may be configured as 800 cc, and a four cylinder may be configured as 3200 cc.

The intake valve 15, the spark plug 13, the exhaust valve 17, and the spark plug 13 are arranged around the cylinder head 12 in four equal parts when viewed in a plane from the upper surface side of each of the cylinder heads 12 [FIG. 7]. reference〕. Then, in the intake port 14 for intake to the intake valve 15, 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 plane, and a vortex flows. It is configured to be (Swirl G). This swirl G phenomenon is the same as that of a single cylinder.

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

Further, explaining the fuel ejection point, the fuel (LPG) is depressurized to near the atmospheric pressure by the pressure regulating valve 26, weighed 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 mixture screw 23, and is mixed with the air sucked from the downstream of the throttle 20. Fuel is supplied mainly from the slit step hole 22 downstream of the throttle 20 when idling and when transient or low speed. When the required output of the gas engine 1 becomes large, the fuel is mainly sucked out from the slit of the Venturi 19a.

As described above, liquefied petroleum gas (LPG), which is easily available and is filled in the gas cylinder 29 and is convenient for transportation, is used as the fuel. The LPG has the advantage that it does not deteriorate like gasoline or light oil even when stored for a long period of time. In addition, it has the advantages of shorter starting time and less carbon dioxide and nitrogen oxide emissions than conventional diesel engines that use light oil as fuel for compression ignition. As shown in FIG. 1, 44 is a radiator and 45 is a fan motor in the figure.

Further, in the daily life of FIG. 1, the engine battery 5 is charged by converting the AC to DC inverter 72 into a low voltage (for example, 12V) DC (see the broken line). As the engine battery 5, a 12 V lead / dilute sulfuric acid battery for automobiles is often used.

In the state of FIG. 1, since the electric power from the DC generator 3 is not used, the on / off switch 82 of this circuit keeps the open position. The state of the commercial power supply (whether or not electricity is coming) is determined by the voltage applied to the integrated control unit (TCU) 61 from the junction point P1 through the fixed resistor 85, the main power supply signal line 86, and so on. This is because the presence of the fixed resistor 85 allows the integrated control unit (TCU) 61 to determine whether or not there is a power failure with a weak current. There is also a resistor in the integrated control unit (TCU) 61, and if the voltage before and after this is monitored, if the main power supply (commercial power supply) is lost, this voltage becomes zero.

In the normal state, 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 to the junction point P2 as shown by a thick arrow. The on / off switch 81 has a function of turning on / off a circuit by a signal from the total control unit (TCU) 61. The switch may open and close the contacts electromagnetically, or may be a normal non-contact switch using a transistor.

Next, an explanation of the operation in an emergency will be described with reference to FIG.
When it is detected that the commercial power supply has been lost due to some accident or the like, in FIG. 1, the on / off switch 81 is opened by the operation of the comprehensive control unit (TCU) 61, and the commercial power supply is blacked out (power failure). Become. The features of the present invention when power is generated by the gas engine 1 from this moment and the electric power is continuously supplied in earnest for a long period of time will be described, but before that, the process until the gas engine 1 is started will be described. First, when the integrated control unit (TCU) 61 detects the loss of a commercial power source (main power source), the signal is transmitted from the integrated control unit (TCU) 61 to the engine control unit (ECU) 62.

The starter relay 42 drives the starter motor 41 with the power supply of the engine battery (12V) 52 by the signal from the engine control unit (ECU) 62. At the same time, the signal from the engine control unit (ECU) 62 energizes the solenoid valve 27 that shuts off the gas that has passed through the mechanical pressure reducing valve 28 that is normally used from the gas cylinder 29 (for LPG) to open it.

At the same time, the pressure adjusting valve 26 that adjusts the fuel pressure to almost atmospheric pressure is operated, and the system is ready to supply the fuel to the fuel supply device 2 of the gas engine 1. On the other hand, the engine oil that is indispensable for the operation of the gas engine 1 is supplied 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 multi-point ignition (with two spark plugs 13 arranged) and gas fuel.

When the gas engine 1 starts and reaches the rated rotation speed and power can be supplied from the DC generator 3 that rotates at the same rotation speed, the on / off switch 82 switches 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 degree of the throttle 20 of the fuel supply device 2 is adjusted by the signal of 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 generated by the DC generator 3 is converted from the direct current to the alternating current having the same power and frequency as the main power source by the direct current → alternating current inverter 71, 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 by 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 and the cooling air promotes heat dissipation from the radiator 44.

Next, the fuel consumption and the energy generated by the fuel will be described. As an example, it is assumed that the gas cylinder 29 is filled with 20 kg of propane C ₃ H ₈ . The molecular weight of C ₃ H ₈ is 44, that is, 1 mol, and the mass of 22.4 liters under standard conditions (0 ° C, 1 atm) is 44. On the other hand, the low calorific value of propane under standard conditions (hereinafter abbreviated as calorific value) 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, the 20 kg cylinder is filled with (20 kg) / (1.964 kg / m ³ ) = 10.18 m ³ of propane in the standard state. Its calorific value becomes ^{90.7MJ / m 3 × 10.18m 3 =} 923MJ (= 923 × 10 3 kJ). Find the electrical energy that can generate electricity with this amount of heat, and examine whether it can supply 1 kW for 72 hours.

The thermal efficiency obtained stably with a multi-point ignition engine that rotates at a low speed with a displacement of 501cc to about 5000cc and a small friction loss is 42%. The efficiency of the generator is 95%, and the conversion efficiency of the DC to AC inverter 71 is 93%. Further, assuming that the maximum output from the P2 terminal is continuously output 1 kW, the energy consumed by the engine is (1 kJ / s) / (0.42 × 0.95 × 0.93) = 2.69 kJ / s. The time to consume 923 × 10 ³ kJ is (923 × 10 ³ kJ) /2.691 kJ / s ≒ 343000 s, that is, 95.3 hours. A single 20 kg cylinder can generate electricity for 95 hours or more (equivalent to 96 hours for 4 days), and achieves the target of 72 hours (3 days) with a margin.

When the commercial power supply (main power supply) is restored, the integrated control unit (TCU) 61 notices this, opens the on / off switch 82, closes the on / off switch 81, and moves from the junction point P1 to the junction 2. The power of the main power supply is supplied. Further, the engine control unit (ECU) 62 stops the engine and at the same time closes the solenoid valve 27 to shut off the fuel. Then, it returns to the state shown in 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 generated from the DC generator 3 which starts the gas engine 1 of the present invention and reaches the rated rotation speed. It takes only a short time (about 10 to about 40 seconds) before it can be supplied. Only such a short time (b time in FIG. 3) is blacked out, and after that, the power generated by the DC generator 3 is used for a maximum of 2 to 3 days until the commercial power is restored. It is an excellent invention that can be done.

Explaining such power supply with a flow chart (see FIG. 3), the power generated by the commercial power source is expressed as the process time a, the time for blackout is expressed as the process time b, and the power generated by the gas engine 1 is expressed as the process time c. There is. In FIG. 3, two blackouts occur and power is supplied by the gas engine 1 each time. The blackout time is actually about 10 to about 40 seconds, and only at this time, if measures are taken for electronic devices such as PCs with another small UPS (uninterruptible power supply), a large-capacity traffic light The power supply of the store or the store can be sufficiently supported by the power generation supply by the gas engine 1 of the present invention.

It is assumed that the required electric output suddenly increases when the gas engine 1 is rotating at a rated rotation speed at an output lower than a predetermined output. The engine speed decreases as the load increases. In an attempt 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 long time to return to a predetermined rotation speed.

A small engine having a small spare capacity cannot cope with this, and the output voltage at the junction P2 may drop, or in an extreme case, the gas engine 1 may stop. Even for a small engine, it is also necessary for the gas engine itself to be able to cope with a sudden increase in load. A flywheel 9 may be provided as such a means.

As for the structure, as shown in FIGS. 1 and 2, the flywheel 9 having a thick outer peripheral portion around the outer circumference is fixed to the end portion of the crankshaft of the gas engine 1 with a fastening bolt. Further, a male spline 35 provided in the center of the DC generator 3 is fitted and fixed to a female spline in the boss portion formed at the center position of the flywheel 9. It is installed with an extremely simple configuration.

When the moment of inertia Ip (unit: kgm ² ) is large, the descent of rotation becomes gentle. The engine speed immediately after rushing is higher than the conventional type. If it is high, the number of suctions is large, so that the time from the mixer to filling the inside of the cylinder 1 is shortened. Then, the amount of the air-fuel mixture supplied during that period increases. A large amount of heat energy is generated, that is, it blows up powerfully. The magnitude of the rotational moment of inertia Ip is 1.2kgm ² ~1.4kgm ² at engine 500Cc～800cc, is substantially the same size as the spark ignition engine of 4 cylinder 2500Cc～4000cc.

Further, comparing the graph of the present invention provided with the flywheel 9 with the conventional technique, in the prior art, when a sudden electric load is generated on the gas engine 1 in an emergency, the engine speed decreases and the engine stalls. The rise is lowered to the limit, and the convergence (convergence) is slow, and the convergence (convergence) time due to the start-up of the present invention is about half, and there is an advantage that the configuration can be made extremely difficult to stall.

As 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 as to be in contact with the commutator 32. 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 electric power to be generated is controlled by the exciting current supplied from the brush 34 to the commutator 32 and the rotor 31.

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

Here, if the electric load is large, the required torque of the gas engine 1 increases and the rotation speed decreases. Therefore, 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. And maintain the predetermined rotation speed. If the number of revolutions rises too much, the reverse control is performed.

Explaining the measures to be taken when the energy of rotation of the flywheel 9 is insufficient for the sudden increase in the electric load, the voltage drops when the electric load suddenly increases. The rotation speed of the gas engine 1 also drops significantly from the predetermined rotation speed Ne (for example, 2000 rpm). Then, since the throttle 20 increases the opening degree by the signal from the engine control unit (ECU) 62, the rotation speed of the gas engine 1 reaches a predetermined rotation speed Ne. However, if it is left as it is, it will rise further, the generated voltage will exceed a predetermined value, and a runaway state may occur.

Therefore, the throttle opening degree 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 stage, 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 shown in the middle stage. Then, as shown in the upper row, the gas engine speed that once dropped to (1) begins to rise.

Then, in (2), the predetermined rotation speed Ne is reached. Therefore, as in the middle stage, the throttle opening is gradually closed by 5% per second, or 5% in steps every second. As a result, the increase in the gas engine speed slows down and starts to decrease. At the moment when it reaches Ne in (2), it gradually opens 4% per second or 4% in steps. And when it reaches (4), it closes by 3%. When this is repeated, the throttle opening is converged to maintain a predetermined rotation speed (for example, 1800 rpm). Needless to say, it may be changed according to the actual situation instead of 5% or 4%.

When the electric load gradually increases, the rotation speed of the gas engine 1 gradually decreases, so the engine control is performed so that the rotation speed detected by the crank rotation sensor 48 maintains the predetermined rotation speed without suddenly setting the full throttle. The throttle 20 is opened by the signal from the unit (ECU) 62. When the rotation speed of the gas engine 1 gradually increases, the opposite is true, and a signal from the engine control unit (ECU) 62 so that the rotation speed detected by the crank rotation sensor 48 maintains a predetermined rotation speed. Closes the throttle 20 with.

When the comprehensive control unit (TCU) 61 detects the return of the commercial power supply, the comprehensive control unit (TCU) 61 sends a signal to the engine control unit (ECU) 62 to stop the gas engine 1 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 the ignition, the throttle actuator 21 closes the throttle 20, and the solenoid valve 27 also closes. As a result, the commercial power supply passes through the present device from the junction point P1 and is output from the junction point P2. Even if the ignition cut is delayed for a moment for some reason, if the rotational moment of inertia of the flywheel 9 is set large as described above, the rotation will not increase too much and the gas engine will not be destroyed.

The on / off switches 81 and 82 may be configured as on / off relay switches, respectively. These relay switches are ordinary non-contact switches using semiconductors even if the contacts are opened and closed electromagnetically. Mainly due to economic efficiency. Further, in the table of FIG. 4, the features of the present invention are particularly shown.

That is, even if the power failure and the recovery continue at predetermined time intervals (1 day to 3 days, etc.), 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, it is an invention that can sufficiently cope with the 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 opened appropriately, LPG flows into the intake duct 18 from the orifice 18a, but tap water simply flows in, and LPG is also a gas. Air is a situation where it is difficult to mix, and as described above, the mixed air-fuel mixture of LPG and air satisfactorily mixes air and LPG due to the swirl S phenomenon or the like in the cylinder 11 described above. Therefore, 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. 9 and 10, the audio output unit 63 is incorporated inside the integrated control unit (TCU) 61. Further, when the device of the present invention is installed outdoors or the like, an audio output unit 63 is arranged at an appropriate place indoors away from the comprehensive 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 integrated control unit (TCU) 61. It is configured in. First of all, even in the event of a sudden power failure (blackout state) in an emergency, this device is an invention that can supply power from the gas engine 1 in about 1 to 2 minutes. It provides a feeling.

In other words, it is a configuration that reassures the point of feeling the greatest anxiety in the event of a sudden power failure with audio output (preferably several times) to turn on within a few minutes. In particular, a simple emergency power that produces a great safety and security effect by coordinating the hardware configuration that lights up within a few minutes and the software configuration that maintains a sense of security even if it is a simple configuration. A supply device can be provided.

As a flowchart for an emergency, as shown in FIG. 11, the gas engine 1 starts preparation for starting at the moment of 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 in the integrated control unit (TCU) 61 or indoors (S3). For example, "Please rest assured. The engine generator will operate."

Then, after a few seconds, the preparation of the gas engine 1 is completed (S4). At the same time as this preparation is completed, the second voice is output from the voice output unit 63 (S5). For example, "Start the engine." 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 starts and reaches the rated rotation speed, electric power can be supplied from the alternator 3. Then, the third voice is output from the voice output unit 63 (S8). For example, "Start energizing." This phase 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 during a power failure is about 1 to 2 minutes. If a power failure occurs and the machine operates, there is no problem if the length of the power failure is short, but if it continues for 10 hours, the inspection will be performed along with refueling, so the system of the present invention is also reset at this time.

Further, in the present invention, even in a normal time (when not during a power failure), the existence of an emergency generator and periodic inspection information of the present device are announced after a certain period of time, for example, every six months or every other year. It is designed to give a sense of security. As a specific configuration, the temporal timing is controlled by the signal of the timer built in the integrated control unit (TCU) 61.

As a flow chart in a normal state, as shown in FIG. 11, an announcement is made after a lapse of a predetermined time (half a year or one year later) (S10) (S11). As the most important matter for this announcement, we will announce the existence of the emergency power supply. For example, it outputs "An emergency generator is installed in this building." Even with this, it can be sufficiently output that the building has the crisis management function of this building.

Furthermore, as a continuous announcement, regular inspection information can be output. For example, "At this time, we recommend regular inspection and maintenance." The importance of this information output is that comprehensive crisis management is possible in which the management information of the building owner and the user integrate the building.
After the periodic inspection and maintenance, the system of the present invention is reset and the system is started from zero time. Since the engine is always started and inspected during regular inspections and maintenance, it may be reset with a 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 part,
2 ... Fuel supply device, 3 ... AC generator, 5 ... Engine battery,
61 ... Comprehensive control unit (TCU),
62 ... Engine control unit (ECU), 63 ... Audio output unit,
81, 82 ... on / off switch, 9 ... flywheel.

Claims (8)

A gas engine for small to medium-sized LPGs with a displacement of over 500cc to 5000cc, a DC generator that generates power by starting the gas engine, an engine control unit with an engine battery, a plurality of on / off switches, and the like. It is equipped with a comprehensive control unit that controls an on / off switch, and the cylinder of the gas engine is provided with two spark plugs, and when the cylinder is viewed in a plan view, the first spark plug, the intake valve, and the first The spark plug and the exhaust valve of No. 2 are arranged around the circumference, and the intake air from the intake valve is configured to flow in in a tangential direction or a direction close to the tangent line when the inside of the cylinder is viewed in a plane.
In the normal state, the power supply side of the commercial power source is energized via the on / off switch, and the engine battery and the engine control unit are described from the moment the commercial power source is lost due to some accident or the like. The gas engine having the above configuration is started within about 1 to 2 minutes, the power generated by the DC generator is used to generate electricity, and the DC power generated by the gas engine is converted into AC power 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 Can be powered by the power of the gas engine only.
A simple emergency power supply device, characterized in that it provides a charging action to the engine battery even with the power generated by the gas engine at the time of the accident or with the power during normal operation. In the simplified emergency power supply device according to claim 1, 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. A simple emergency power supply device featuring. In the simplified emergency power supply device according to claim 1 or 2, the mainstream of the air-fuel mixture flowing into the cylinder of the gas engine does not directly hit the ignition point of the spark plug and flows in the vicinity thereof. A simple emergency power supply device characterized by being made. In the simplified emergency power supply device according to claim 3, the lower surface of the cylinder head of the upper part of the cylinder of the gas engine is formed as a flat spherical concave surface, and one bulge is formed on the lower surface of the flat spherical concave surface. A simple emergency power supply device characterized in that it is provided so as to be on the front side of the spark plugs and on the downstream side of the air-fuel mixture. The simplified emergency power supply device according to claim 1, 2, 3 or 4, wherein the gas engine has a 4-cylinder in-line configuration. The simplified emergency power supply device according to claim 1, 2, 3, 4 or 5, wherein a flywheel is provided between the gas engine and the DC generator. Power supply device. In the simplified emergency power supply device according to claim 1, 2, 3, 4, 5 or 6, a plurality of the on / off switches are turned on / off by a signal from the integrated control unit, and the power thereof is A simple emergency power supply device characterized in that it is supplied from the engine battery having a voltage as low as that of an engine control unit. The simplified emergency power supply device according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the on / off switch is an on / off relay switch. Supply device.

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