Working principle, characteristis and trouble shooting of flame out solenoid valve

Working principle, characteristics and troubleshooting of flameout solenoid valve

The flame-extinguishing solenoid valve has a coil similar to the generator. When the power is turned on, the magnetic force is generated to pull the flame-extinguishing switch back to the oil. When the power is off, there is no magnetic force. The spring pushes the flameout to the flame-extinguishing position, and the oil is not supplied. After the flame-extinguishing solenoid valve is used for a long period of time, the piston is easily blocked by dust and dirt and cannot move, and then there is a phenomenon that it cannot be started or cannot be extinguished. Need to remove the cleaning, the inside can not be lubricated, because the solenoid valve is close to the engine, the lubricant is easy to mix with dust and steamed to the mud by the high temperature of the engine.

Flameout solenoid valve function:

The use of a flameout solenoid valve ensures that the engine is forced to stall when the engine is running, but the engine or inorganic oil pressure is low, protecting the engine from damage. Note: If the engine is stopped, there is definitely no oil pressure. At this time, the flameout solenoid valve will not work even if it is energized. The working time of the flameout solenoid valve is about 30 seconds, which effectively prevents the engine from being oily. The engine is burnt and the cylinder is seriously damaged. The lack of oil caused by burning oil, or the oil filter is clogged, the oil pump is damaged, etc. The oil pressure is low, or the inorganic oil pressure will cause the engine to burn the cylinder, increasing unnecessary economic loss and time waste.

Flameout solenoid valve features:

1. The working current is small: when pulling 100N, the 24V flameout current is ≤1.6A, and the 12V flameout current is ≤2.5A. It is not necessary to install a large current relay in the vehicle control circuit.

2. Long service life: It can work more than 100,000 cycles under normal use, and the oil stop and extinguishing work time is less than 1.5 seconds. The rest of the time is automatically turned off and the power is not working.

3, small size and easy to install: can be directly installed on the fuel injection pump, can also be installed with flexible shaft and wire rope assembly, (can be customized according to customer requirements) choose the appropriate location to install.

4, excellent material: shell material has high strength, high hardness, flame retardant, antifreeze, impact resistance, aging resistance and so on.

5, excellent technology: voltage delay control and over current protection circuit.

6, the price is cheap, the application is wide: suitable for any diesel engine.

Precautions for flameout solenoid valve:

1. Before installing the flameout solenoid valve, carefully check the total power input circuit to determine the fuse. The switch connection is normal. The total switch voltage output is above 24V. If there is any abnormality, please check it!

Second, check the line of the flameout solenoid valve, generally three lines of black, white and red, the black line is the common end, the white line is to keep the weak current input, the red line is the input and the strong current input; the third line must be connected correctly. Re-check whether the wire voltage is above 24V before wiring;

Third, correctly connect the flame-extinguishing solenoid valve into the line end, first test, open the car, the whole car is powered on, the flame-extinguishing solenoid valve is closed, it is determined that the solenoid valve has been completely sucked into place, it is easy to break in place, and the solenoid valve body is caught by hand. , three or five minutes, to see if there is a hot phenomenon, if not stated that the installation is normal;

Fourth, after the installation test is normal, the key is closed, and then correctly installed on the engine, adjust the position of the drawbar, this is also very important, if the position of the tie rod is not adjusted well, it will cause the closure to be out of position and burn out the flameout solenoid valve;

5. After installation, start the test and extinguish the solenoid valve working state, increase the throttle, 哄 a few minutes, touch the temperature of the solenoid valve body, no heat indicates normal, and the electromagnetic installation is completed successfully.

Flameout solenoid valve failure phenomenon:

The engine cannot be turned off when the key switch hits the zero position.

Failure analysis of flameout solenoid valve:

1. From the electrical aspect, it is possible that the power supply for the flameout solenoid valve is not completely cut off or the key switch is stuck.

2. It is possible that the flameout solenoid valve is damaged or the lever is deformed.

3. From the aspect of engine oil circuit control, it is possible to issue a single pump.

4. It is possible that the engine governor rack is stuck or deformed.

Fireout solenoid valve troubleshooting method:

1. Check that the starting circuit is energized normally and the starting key switch is not stuck.

2. After the customer reflects and the on-site test machine, there is no speed drop phenomenon and the manual flameout is normal when the road roller works, which proves that there is no stuck phenomenon in the single pump of each cylinder.

3. The engine is turned off and the solenoid valve is removed. After the power is turned on, the flameout solenoid valve is operated at a different angle than the new one, and the action is reversed when the power is turned on.

4, through the formal installation method to replace the new flameout solenoid valve after the power is used, the engine still can not automatically turn off.

5. By displacing the engine parking plate to feel that the rack elastic force is not enough, it can be judged that the engine governor rack is issued or deformed, causing the flameout solenoid valve to be damaged and the engine cannot be automatically turned off.

Fireout solenoid valve troubleshooting experience:

From the circuit to find out the cause of the fault for the engine, through the comparative analysis to find the point of failure.