JPH0717811Y2 - Engine restart protection device for engine generator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention protects the restarting of an engine in an engine generator, and in particular, protects the restarting of the engine that was stopped due to running out of fuel when a long-term power failure occurs due to air intake into the fuel system. The present invention relates to an electric circuit configuration of a fuel protection device.

[0002]

2. Description of the Related Art Generally, in Japan, when the typhoon season arrives, the number of regions where it is hard to say that the power supply situation for which the power outage lasts for several days is not good is increasing. Then, many stores, financial institutions, and the like have the following adverse effects on business, such as the inability to use the equipment due to the power outage. To explain this concretely,
That is, a: Each store is equipped with an engine generator in preparation for a power outage, but when the device is operated for several days, the fuel tank mounted on the engine that drives the generator is targeted for a temporary power outage. Since it is designed as, it cannot be used for a long time (3 to 5 days), the engine is forced to stop due to lack of fuel, and it becomes inoperable. b: When the engine stops due to running out of fuel, the air in the fuel tank is sucked in from the lower end of the fuel pipe, so air enters the fuel system of the engine (diesel) and air also enters the fuel pump, making it impossible to restart the engine. Fall. c: Even if the air bleeding instruction is given by telephone, etc., it is unfamiliar, the treatment is difficult to understand, it takes a long time to recover, and it is in an unpleasant situation. d: The Applicant's product is equipped with an alarm device that issues a fuel shortage alarm when the fuel in the fuel tank becomes low and it becomes necessary to replenish it. As a result of the fact that fuel cannot be replenished and the engine continues running until the engine runs out of fuel, the problem described in the item a occurs.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to solve the drawbacks of deficiency. In the event of a power failure, the engine generator is driven, a fuel shortage warning is issued, and the engine stops. Also, no air enters the fuel system, and after that, just by refueling, the engine restarts automatically and smoothly, and the engine protection device in the uninterruptible device that makes the recovery work quick and easy. It is intended to be provided.

[0004]

The present invention is directed to a fuel pipe F
Oil surface L located above the oil surface L ₀ located at the lower end of P
A fuel tank FT equipped with a level switch SL ₁ that operates at ₁ or less is provided, and a series circuit of an open contact piece Ta and an engine stop circuit ESC, a contact piece S that operates upon receiving a power failure detection signal, and a closed contact piece. Actuated by receiving a signal from a pilot lamp PL and a level switch SL ₁ connected in parallel with a series circuit of a piece Tb and an automatic starter circuit ASC, and a timer T set in time to reversely connect the contact pieces Ta and Tb. And a series circuit with the contact piece S ₁ that is connected to the operating power source P in parallel, and an oil level above the oil level L _{0 at} the lower end of the fuel pipe FP. L ₂ becomes includes a fuel tank FT of the level switch SL ₂ that operates a level switch SL ₁ that operates at the oil surface L ₁ below positioned above the oil surface L ₂ is loaded below, open Receiving a series circuit of a single Ta and the engine stop circuit ESC, a series circuit of a contact piece S and the closed piece Tb and automatic start circuit ASC that operates by receiving the power failure detection signal, a signal of the level switch SL ₂ wherein a contact piece S ₂ operating each contact piece Ta, a series circuit of a timed configured timer T is inverted connecting Tb, the contact piece S ₁ and the pilot lamp PL, which operated by receiving a signal of the level switch SL ₁ And a series circuit of the operating power source P
The above-mentioned object is solved by an engine restart protection device in an engine generator, which is characterized in that it is connected in parallel with.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention.
FIG. 4 is a schematic diagram for explaining an operating position of a level switch installed in the fuel tank. FIG. 2 is an electrical connection diagram showing one embodiment and FIG. 3 is a different embodiment. In each drawing, the same parts are designated by the same reference numerals, and the configuration of the present invention will be described in detail. In FIG. 1, FT is a fuel tank mounted on an engine (not shown), FP is a fuel pipe connected to a fuel pump of the engine, L ₀ is the lowest position of the oil level, and below this position, air is drawn in the fuel pipe. Is sucked in and the engine stops. L ₁ is an oil level position for prompting fuel supply, L ₂ is an oil level position for forcibly stopping the engine,
SL ₁ indicates a level switch that is closed when the fuel becomes below the oil level L ₁ , and SL ₂ indicates a level switch that closes when the fuel becomes below the oil level L ₂ . Next, in FIG. 2, T is a timer, Ta is an opening contact piece, Tb is a closing contact piece, and when the fuel in the fuel tank FT is normal with the oil level position L ₁ or higher, the level switch SL ₁ is opened. As shown in the figures, the contact piece Tb is closed and the contact piece Ta is open. S is a contact piece of a power failure detection circuit (not shown) installed in the generator to be described later, which is closed due to the occurrence of a power failure and the automatic start circuit ASC is energized to start the engine and function as a normal automatic start generator. The automatic starter circuit ASC is connected in series via the contact piece Tb. Contact piece Ta
Is connected in series with the engine stop circuit ESC and is closed (the contact piece Tb is opened) when the set time limit of the timer T has elapsed. A signal is input to a stop detection circuit (not shown) to forcibly stop the engine. , The contact piece Tb cuts off the signal of the automatic starting circuit ASC and stops the restart of the engine even during a power failure. S ₁ is a contact piece that is operated by a level switch SL ₁ that is open when the fuel is above the oil level L ₁ and is normal. When it is below, the contact piece is closed and the pilot lamp PL and the timer T that indicate a fuel shortage are , Are both energized. In addition, P shows an operation power supply. Further, in FIG. 3, description of the same components as in FIG. 2 will be omitted, and only the structural features shown in FIG. 3 will be described.
₁ is open when the fuel in the fuel tank FT is above the oil level L ₁ and is normally open, and is connected in series with the pilot lamp PL, and S ₂ is when the fuel is above the oil level L ₂ Is a contact piece which is operated by a level switch SL ₂ which is opened and which is closed below, and the others are the same as those described in FIG.

[0006]

[Effect of the Invention] The present invention has a configuration of ridges. Next, the operational effects based on the configuration of the present invention will be described.
In the configuration shown in FIG. 2, when the fuel in the fuel tank FT is above the oil level L ₁ , the level switch SL ₁ is open, so the timer T is not energized and the contact piece Ta thereof is not activated.
Is open, the contact piece Tb is closed, and the contact piece S is closed because a power outage is being performed, and is in the state shown in the figure, and the generator (not shown) is driven and is in the power generation state. Next, when the fuel falls below the oil level L ₁ , the level switch SL ₁ is closed, the contact piece S ₁ is closed, the timer T is energized, and at the same time the pilot lamp P ₁ is activated.
T lights up and indicates fuel shortage. Since the contact piece Ta is closed and the contact piece Tb is opened by the lapse of the set time of the timer T and the connection state is reversed from the state shown in the drawing, a signal is input to the engine stop circuit ESC to forcibly stop the engine and at the same time.
The contact piece Tb is opened to shut off the automatic start circuit ASC, and the automatic start circuit ASC is not restarted even during a power failure. Since the fuel is replenished oil surface becomes contact pieces S ₁ level switch SL ₁ becomes higher than the oil surface position L ₁ is opened, the timer T is de-energizing, the contact piece Ta is opened, the contact piece Tb is Although it closes and returns to the original state, at this time, if the power failure is still occurring, the contact piece S from the power failure detection circuit (not shown) is closed, so the automatic start circuit ASC is energized again to start the engine. Reboot. Finally, in the configuration shown in FIG. 3, when the oil level of the fuel tank FT is normal above the oil level position L ₁ , the level switches SL ₁ and SL ₂ are both open, and the contact pieces S ₁ , S ₂ are opened together as shown in the figures, and neither timer T nor pilot lamp PL is energized. When a power failure occurs in this state, the contact piece S of the power failure detection circuit (not shown) is closed, so that the automatic start circuit ASC is energized to start the engine and drive the generator to function as an automatic start generator. When the operating time becomes long and the oil level of the fuel falls below the oil level position L ₁ ,
The level switch SL ₁ is closed, the contact piece S ₁ is closed, and the pilot lamp PL is turned on to display the fuel shortage. Further, when the fuel oil level becomes equal to or lower than the oil level position L ₂ , the level switch SL ₂ is closed and the contact piece S ₁ and the contact piece S ₂ are also closed, and the timer T is energized. After the set time of the timer T has elapsed, the contact piece Ta is closed and the contact piece Tb is opened to give a stop signal to the engine stop circuit ESC to forcibly stop the engine. At the same time, the contact piece Tb is opened to automatically start the automatic start circuit ASC.
The signal of is cut off and the restart is blocked. In such a state, the fuel is replenished and the oil level becomes equal to or higher than the oil level positions L ₂ and L ₁ so that the level switches SL ₂ and SL ₁ are opened and the respective contact pieces S are opened.
_{When 1} and S ₂ are opened, the pilot lamp PL is turned off, the energization of the timer T is released, each contact piece Ta is opened, and Tb is closed. At this time, if there is still a power failure, unillustrated power failure detection The circuit contact S closes and the automatic start circuit ASC is re-energized to restart the engine and continue power generation. As described above, in the configuration shown in FIG. 2, the level switch SL ₁ for detecting the fuel shortage is closed to close the contact piece S ₁ , and the timer T is used to set the signal after the fuel shortage signal is issued. If fuel is not replenished after the time limit has elapsed, the engine is forcibly stopped, and at this time, the automatic start circuit ASC of the engine is opened to prevent restarting after the stop. By setting it to function before the engine stops due to a break, air is prevented from being sucked into the fuel pump of the engine. When fuel is replenished in this state and the signal disappears, the function as a generator is restored by closing the automatic start circuit ASC of the opened engine and automatically starting the engine. If the power failure is recovered at that time, even if the automatic start circuit ASC is closed, the start signal is cut off by opening the contact piece S of the power failure detection circuit (not shown), so the engine does not start. , Stay in standby for the next power outage. Further, in the configuration shown in FIG. 3, the level switch SL ₂ for detecting that the fuel tank FT has reached the dangerous oil level position L ₂ is used in combination with the level switch SL ₁ shown in FIG. When the surface becomes equal to or lower than the surface L _{2, the contact} piece S ₂ is opened by the signal from the switch SL ₂ to release the energization of the timer T, and the engine stop circuit ESC is immediately opened.
Also, when fuel is replenished and the signal is cut off, the automatic starting circuit ASC that was opened like the one shown in FIG. 2 is closed and the engine is automatically restarted. It is possible to prevent the fuel system from being bothered by a restart process due to air suction due to the fuel exhaustion, and thus, it is possible to expect an excellent action and effect capable of sufficiently achieving the intended purpose of the present invention even with a simple configuration. Note that, electrically, the circuit is not limited to the circuit shown in the accompanying drawings, and similar functions can be provided by software such as a programmable controller.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining an operating position of a level switch loaded in a fuel tank.

FIG. 2 is an electrical connection diagram showing an embodiment of the present invention.

FIG. 3 is an electrical connection diagram showing a different embodiment of the present invention.

[Explanation of symbols]

ASC Automatic start circuit ESC Engine stop circuit FT Fuel tank FP Fuel pipe L ₀ Minimum oil level L ₁ Oil level position to prompt refueling L ₂ Oil level position to force engine stop P Operation power PL Pilot lamp S Power failure detection circuit Contact piece S ₁ , S ₂ Contact piece operated by signals from each level switch T Timer Ta Open contact piece Tb Closed contact piece

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H02J 9/08

Claims (2)

[Scope of utility model registration request] 1. An oil level L located at the lower end of the fuel pipe FP.
_It is equipped with a fuel tank FT loaded with a level switch SL ₁ that operates below the oil level L ₁ located above ₀ , and receives a series circuit of the opening contact piece Ta and the engine stop circuit ESC and a power failure detection signal. Contact piece S and closed contact piece Tb
And a series circuit of the automatic starting circuit ASC, and each of the contact pieces T
and a series circuit of a pilot lamp PL connected in parallel with a timer T set to reversely connect Tb and Tb, and a contact piece S ₁ that operates by receiving a signal from the level switch SL ₁ , An engine restart protection device in an engine generator, wherein a circuit is connected in parallel to an operating power supply P. 2. The oil level L located at the lower end of the fuel pipe FP
Level switch SL ₂ which operates below the oil level L ₂ above ₀ and oil level L above the oil level L _2.
A fuel tank FT equipped with a level switch SL ₁ that operates at ₁ or less, a series circuit of an opening contact piece Ta and an engine stop circuit ESC, and a contact piece S that operates in response to a power failure detection signal are closed. A series circuit of the contact piece Tb and the automatic starter circuit ASC, a contact piece S ₂ that operates by receiving the signal of the level switch SL ₂ and a timer T set to time-reversely connect the contact pieces Ta and Tb. A series circuit, and a series circuit of a contact piece S ₁ and a pilot lamp PL that operate by receiving a signal from the level switch SL ₁ and each series circuit is connected in parallel to an operating power supply P. An engine restart protection device for an engine generator.