The possible causes are oil supply pipeline blockage, oil pump not pumping, oil supply pipeline vacuum leakage, etc. Remove the high pressure discharge pipe to check the oil condition of the oil pump. When pumping oil normally, the oil column should be ejected outward. There is another reason why the nozzle does not spray oil, that is, the oil solenoid valve is not energized. When the oil break solenoid valve loses power, even if the oil pump is in normal operation, the high-pressure end will not supply oil to the fuel injection nozzle. Only after the controller makes the oil break solenoid valve electrified can diesel fuel be allowed to blow out, the purpose of which is to prevent the original accumulation of diesel fuel in the furnace from deflating when it meets an open fire. Under normal circumstances, the burner carries out a pre-blow air to clean the combustion chamber of residual diesel oil, and then fuel injection ignition. In the pre-blowing stage, although the oil pump motor is running, the oil cut-off solenoid valve is not energized, and the high-pressure diesel oil pumped by the oil cut-off solenoid valve cannot reach the fuel injection nozzle.
When the ignition transformer is energized, a high voltage of about 8KV is generated. This voltage breaks through the electrode gap, generating a strong spark that ignites the diesel oil mist. When the flame burns stably, the spark ignition is no longer needed, and the flame sensor sends the flame status information to the controller to stop the work of the ignition transformer. First, the ignition transformer is not energized (it may be due to poor contact of the power supply line or the relay in the controller). The other is that the insulation between the two thermal electrodes is poor due to carbon deposition, and the high voltage is leaked, so there is no discharge spark. The distance between the ignition electrodes should be about 3mm, and the distance between the ignition electrodes and the front face of the nozzle should be about 5-7mm. The two electrodes must be well insulated.
After long-term use and wear of the oil pump, its maximum pressure will gradually decrease, resulting in bad oil injection atomization and difficulty in ignition. After fire, there will be a large number of smoke and unstable flame, and it is of no help to adjust the pressure of the oil pump. The aging of the nozzle results in a similar situation of poor atomization.
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