JP3344192B2 - Emergency standby generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency standby power generator using a diesel engine, and more particularly to a protection device for a diesel engine during no-load or light-load operation.

[0002]

2. Description of the Related Art A diesel generator in which an AC generator is connected to a diesel engine has advantages that it can be easily started and stopped, can respond to sudden changes in load, and has relatively high thermal efficiency. Have been.

In this type of power generator, a diesel engine may be operated for a long time with no load or light load. In such a case, carbon sludge accumulates in the cylinder and in the exhaust system due to incomplete combustion, causing damage to the inner surface of the cylinder, which may cause a metal seizure accident or an engine stop accident.

For this reason, the following countermeasures are taken.

(1). By installing a permanent water resistance load (dummy) facility and operating the engine, carbon sludge is prevented from accumulating.

(2). The actual load blackout is switched once or twice a year to burn the accumulated carbon, and to carry out regular inspection and maintenance to disassemble and inspect the upper part of the cylinder.

(3). Install a metal resistor (with fan) in place of the water resistor and run the engine.

[0008]

However, the above-mentioned countermeasures have the following problems.

The countermeasure (1) not only requires high construction costs for water resistance equipment, but also requires time and effort for water management (water cutoff, water leakage, rust, inspection of elevating devices, etc.).

The countermeasure (2) is that the actual load operation may not be possible depending on the user (for example, year-round operation), or if the number of inspections is large, a large cost is required for overhaul. And the time taken for power outage measures is insufficient.

In the measure (3), if the electric fan breaks down during operation, there is a risk of fire or abnormal overheating.
In addition, since the resistor is fixedly set, the operation is limited.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an emergency standby power generator which can contribute to safe operation and can be easily maintained.

[0013]

According to the present invention, a radiator type diesel engine is connected to an alternator, and a metal load is used as a dummy load to protect the engine cylinder system during continuous operation with no load or light load. An emergency standby power generator using a heater, characterized in that a no-load operation prevention unit consisting of a metal resistor, a case, a resistor angle adjustment mechanism, etc. was installed in the duct part on the radiator exhaust air outlet side. Therefore, the angle of the metal resistor is set to the angle at which the ventilation resistance is minimized during a power failure, and to the angle at which the ventilation cooling force can be obtained to obtain a resistance value equivalent to the required dummy load set value during no load or light load operation. I try to adjust it.

[0014]

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a radiator-cooled diesel engine with a fan, 2 is a synchronous generator, and 3 is a generator board.

The engine 1 includes an engine body 1A, a radiator 1B with a fan, an exhaust chamber 1C, and the like, and a no-load operation prevention unit 4 is installed in the duct 1D on the radiator exhaust outlet side. . This unit 4 includes a number of metal resistors (grid resistors) 4
A, a case 4B, an electric resistor angle adjusting mechanism 4C, etc., and a metal resistor 4A is connected to an output terminal in the generator panel 3 via an electromagnetic contactor 5. Electromagnetic contactor 5
Are also arranged in the generator panel 3.

Next, the operation will be described. During a power outage,
As shown in FIG. 1, the metal resistor 4A has an angle which does not hinder the exhaust of the radiator. That is, the direction is parallel to the axial direction of the tact 1D. In this state, the ventilation resistance of the unit 4 is minimized, and the influence on the cooling capacity during the rated output operation is minimal. At this time, the electromagnetic contactor 5 is opened, and the generator output is supplied to the actual load.

On the other hand, in the case of continuous operation without load during standby operation or the like, the angle of the metal resistor 4A is adjusted so that the ventilation resistance in the unit 4 increases as shown in FIG. The angle corresponds to the required dummy load set value. That is,
The required resistance value is obtained by changing the ventilation cooling power. At this time, the electromagnetic contactor 5 is closed. When the diesel engine 1 is operated in this state, the rated
If 30% of the dummy load is kept, the adverse effect on the engine cylinder is considerably improved.

[0018]

As described above, according to the present invention, since the metal resistor is used for the dummy load, carbon or the like does not accumulate even during long-time operation without load, and the engine cylinder system can be protected. it can. This is also effective for standby operation for follow-up of power failure after power recovery. In addition, since the no-load operation prevention unit is incorporated in the radiator exhaust path,
A dedicated cooling fan is not required, and there is no failure caused by the electric fan. Further, since an arbitrary resistance value can be obtained by adjusting the angle of the metal resistor, highly reliable data can be obtained in a periodic inspection test. Further, there is an advantage that maintenance and management are extremely easy and the equipment cost is low as compared with the water resistance.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating an operation state of the no-load operation prevention unit according to the embodiment during a standby operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Diesel engine of radiator cooling system with a fan 1A ... Engine body 1B ... Radiator with a fan 1C ... Exhaust chamber 1D ... Duct 2 ... Synchronous generator 3 ... Generator board 4 ... No-load operation prevention unit 4A ... Metal resistor 4B ... Case 4C: Electric resistor angle adjustment mechanism 5: Electromagnetic contactor

Claims (1)

(57) [Claims] 1. An emergency standby generator using a metal resistor as a dummy load to protect an engine cylinder system during continuous operation with no load or light load while connecting an alternator to a radiator type diesel engine. In the device, in the duct part on the radiator exhaust air outlet side,
An emergency standby power generator comprising a no-load operation prevention unit including a metal resistor, a case, a resistor angle adjusting mechanism, and the like.