JPS601225Y2 - Diesel engine for generator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diesel engine for a generator, and particularly to an afterburner thereof.

□4 for generator only? 'The diesel engine is highly supercharged, lightweight, and compact, making it one of the most powerful engines in the world!
However, for this reason, there is a decrease in speed and dynamic ratio when the load fluctuates.

Special feature 1: The generator of this ship's drawer was developed mainly in the development of automatic control equipment in China, and as semiconductors and electronic computers came into use, further improvements in electromagnetic fields were required. It has become.

In addition, ships operate two units in parallel for safety when passing through the straits, but according to the classification rules of each country, even if one of the units breaks down and stops, the remaining one can handle the entire load at a rate of 10% or less. It is required to accommodate the speed change.

For this reason, in some engines it is necessary to use a generator two stages larger than the one commensurate with the generator output.

However, if a large engine is used, the load will be lower during normal operation, resulting in increased fuel consumption, which will not only reduce the initial investment but also
This has the disadvantage of increasing operating costs.

In order to solve the above problems, the present invention runs multiple diesel engines in parallel, each having an exhaust turbine connected to the exhaust pipe of the cylinder and a supercharger connected to the air supply pipe of the cylinder and driven by the exhaust turbine. A fuel injection nozzle is provided in the exhaust pipe of each diesel engine, and an electromagnetic cylinder for fuel supply is connected to the nozzle via an injection electromagnetic valve. , an ignition plug that ignites the fuel injected from the nozzle is provided near the nozzle, and operates as an auxiliary contact of a circuit breaker for the other generator that operates when the other generator stops abnormally or when the load on the own generator suddenly increases. The structure includes means for driving the electromagnetic cylinder, the electromagnetic valve, and the ignition frame number in response to the detection operation of the load fluctuation detector.

An embodiment of the present invention will be described below based on the drawings.

Figures 1a and 1c are characteristic diagrams showing how the engine speed and fuel supply amount change when a load is applied to the diesel engine. From 0.1 to O, the amount of fuel is injected according to the load capacity due to the operation of the governor as shown in C.
The turbocharger waits for the exhaust pressure to rise and then increases its rotational speed, and the boost pressure increases accordingly, so it follows the load fluctuations later.

Therefore, the engine speed is approximately 1 after applying the load as shown in b.
Follow the process of reaching the lowest rotation speed with the hoe and then recovering.

Therefore, taking into account that diesel engines have a large air surplus ratio at low loads and that the exhaust still contains a few percent of oxygen in the exhaust, a fuel injection nozzle was installed in the middle of the exhaust pipe of each diesel engine, and the engine was operated in parallel. When the engine on the other side of the engine fails or stops, or when a fairly large load is applied to the engine on the own side, such as when starting a large electric motor, fuel is injected from the nozzle, ignited, and exhausted. increase the amount of fuel, reduce the follow-up delay of the supercharger, and rapidly increase the boost pressure.

By doing so, it is possible to suppress a decrease in the engine speed.

Figure 2 shows a schematic configuration diagram, in which 1 is a cylinder of a diesel engine, to which an air intake valve 2 and an exhaust valve 3 are attached, and an air supply a connected to the air intake valve 2 and exhaust valve 3. trachea 4
and exhaust pipe 5 are connected to a supercharger 6 and an exhaust turbine 7, respectively, and the supercharger 6 is driven by the exhaust turbine 7.

Further, a fuel injection nozzle 8 is installed in the middle of the exhaust pipe 5, and the nozzle 8 is connected to an electromagnetic cylinder 10 via an injection electromagnetic valve 9. is check valve 11
It is connected to the light oil tank 12 via.

This electromagnetic cylinder 10 sends light military oil to the injection solenoid valve 9 side when the power is on, and during a power outage, the cylinder is pulled up using a force such as a spring puller (not shown), and light oil is sent from the tank 12 through the check valve 11. Inhale.

13 is a bulky plug for igniting the nozzle 8.

= When the other side stops abnormally due to an accident in the other side's engine or generator during parallel operation, the entire load shared by the other side's circuit breaker becomes its own load, but the load in the main switchboard 14 It is detected by the auxiliary contact 16' of the counterpart generator shell circuit breaker 15' provided at the opposite side.

Further, when the load on the own generator increases, the differential load fluctuation detector 18 outputs a change on the secondary side of the load detection current transformer 17 provided in the main circuit of the own generator.

The injection solenoid valve 9 and the electromagnetic cylinder 10 are connected to the storage battery 20 via a timer 19 that operates in response to the detection operation of the auxiliary contact 16' or in response to the amount detected by the differential load fluctuation detector 18. It is excited and the light oil injection time is controlled.

At the same time, the ignition line 13 is activated by the storage battery 20 and ignites the fuel injected from the nozzle 8, causing the light oil to burn for a time determined by the timer 19.

Therefore, the exhaust pressure in the exhaust pipe 5 rises in a short period of time, and the rotation speed of the exhaust turbine 7 rapidly increases, compensating for the lack of supply pressure due to the follow-up delay of the supercharger 6, and suppressing a drop in the engine rotation speed.

Note that the differential type load fluctuation detector 18 also operates when the auxiliary contact 16' of the counterpart circuit breaker 15' operates the solenoid valve 9 and the solenoid cylinder 10.

Here, 15 and 16 are the circuit breakers for the own side generator and their auxiliary contacts, and 17', 18', and 19' are the current transformers for load detection installed in the main circuit of the other side generator, and the differential type load fluctuation. A detector and its timing device.

As described above, according to the present invention, when the other side's generator stops abnormally or when the load on the own side's generator suddenly stops, it is detected and the remaining oxygen in the exhaust pipe is used to ignite the fuel that is immediately injected from the nozzle. Since the exhaust pressure of the side engine can be increased, this has the advantage of suppressing speed fluctuations caused by a delay in following the supercharger rotation speed.

[Brief explanation of the drawing]

FIG. 1 is a characteristic diagram showing changes in engine speed and fuel supply amount when a load is applied, and FIG. 2 is a schematic configuration diagram showing an embodiment of the present invention. 1...Cylinder, 4...Air supply pipe, 5.
...Exhaust pipe, 6...Supercharger, 7...
...Exhaust turbine, 8...Nozzle, 9...
... Solenoid valve for injection 10 ... Solenoid cylinder, 1
2... Light oil tank, 13... Spark plug, 15.15'... Generator circuit breaker, 16, 16
'...= Auxiliary contact, 18, 18'... Differential type load fluctuation detector, 19, 19'... Timing device.

Claims (1)

[Scope of utility model registration request] A multi-mezzo easel engine having an exhaust turbine connected to the exhaust pipe of the cylinder, and an exhaust turbine connected to the air supply pipe of the cylinder and driven by the exhaust turbine in parallel?
The diesel engine is configured to operate at 11 hours and drive a generator for each customer, and a fuel injection nozzle is installed in the exhaust pipe of each diesel engine. When the cylinder is connected, the nozzle is connected to an ignition plug that ignites the fuel injected from the nozzle, and the auxiliary contact of the circuit breaker for the other side's generator or the auxiliary contact of the breaker for the other side's generator that operates when the other side's generator stops abnormally. An inisel engine for a generator, characterized in that it is provided with means for driving the electromagnetic cylinder, electromagnetic valve, and spark plug in response to the detection operation of a load/load fluctuation detector that operates when a load suddenly increases.