Shandong Shunhang Generator Rental Co., Ltd.
Address: Jinan City, Shandong Province
Contact: Manager Hao
24h service hotline15066665158
Causes and adjustment methods of uneven fuel supply failure of diesel generator
The uneven fuel supply of the diesel generator will cause excessive fuel consumption of the diesel engine, or the diesel engine will not operate normally. In this case, check the cause and adjust the fuel injection pump.
1. Reasons for uneven fuel supply of diesel generator fuel injection pump:
1. The oil supply is uneven due to the failure of mechanical parts: After long-term use, as the oil pump drive loose shaft and clearance are too large, the drive gear wear and backlash increase, and the oil supply uniformity is affected. In addition, high-pressure pipe joints leak due to frequent vibration or tightening, and the fastening force on the joint metal and clogging of the oil pipe will also cause uneven oil supply for each cylinder. In addition, in the fuel injection pump and governor spring, the plunger spring has a stronger force, a larger deformation and a higher operating frequency. Therefore, the breaking frequency is also high. The amount of light fuel injection is reduced, the fuel injection amount of each cylinder is uneven, the interval between injections of each cylinder is very poor, and the start time of fuel injection is delayed.
2. Uneven fuel supply during commissioning: When the fuel injection pump is commissioned, the fuel supply must be 3% at the rated speed. In the actual debugging process, due to the inconsistency of the length, shape and caliber of the special injector and high-pressure fuel pipe of the test bench and the original machine, plus the difference in debugging technology, the oil quantity in the actual injection pump I was uneven. Water injection pumps often exceed 3% after installation.
3. Differences between debugging status and operating conditions: Test the fuel injection pump at normal temperature on a test bench, use the machine at the compression end of the cylinder, the temperature in the cylinder of 500 to 700, and the pressure of 3 to 5 MPa, and compare them . Great. During the operation of the locomotive, the temperature of the fuel injection pump and the fuel injector is about 90 ° C, which reduces the viscosity of the diesel oil, increases the internal leakage of the plunger and the needle valve, and makes the return flow of oil greater than DE. tapping. According to the test, the actual oil pump inlet cylinder is only about 80% of the test bench. Although the oil pump debugger will consider this factor, it cannot accurately grasp it. In addition, due to the different wear and seal of the cylinder piston and the valve mechanism, the temperature and pressure of each cylinder after compression will also be different. Even with the fuel injection pump installed on the test bench, the fuel supply per cylinder will be uneven.
two. Readjustment of the fuel injection pump
According to the exhaust temperature, pressure or color of each cylinder to determine the actual operating conditions and degree of combustion, determine the cylinder's fuel supply is too much or too little, the fuel supply time is too early or too late, and then adjust I. Conducted. By properly adjusting the fuel supply and fuel supply time of each cylinder, the fuel injection pump can supply oil to each cylinder according to the principle of distribution according to needs, thereby eliminating the actual difference of each cylinder.
(1) Start the diesel generator. The idle speed is 2 to 3 minutes. The cylinder head of each cylinder is in contact. The cylinder head near the injector is touched by hand. If the cylinder temperature is too high, you can preliminarily judge that the cylinder fuel supply is too high.
(2) Check the fuel supply advance angle. Generally speaking, the oil spill method can be used to check the fuel supply advance angle. The high-pressure oil pipe connector at one end of the oil pump is loosened, the fuel injector is disconnected at one end, the oil pipe is turned to the horizontal position, the high-pressure oil pipe connector at the oil pump is tightened, and the throttle is pulled to the maximum position A. The pressure reducer opens until a few drops are exiting the high-pressure tubing. So far, diesel. Clean the diesel at the tubing outlet and slowly rotate the flywheel. At the same time, observe the oil level at the outlet of the high-pressure oil pipe, and immediately stop rotating the flywheel after starting. At this time, the mark on the water tank or the body should be aligned with the top dead center of the flywheel at the first 16-20 degrees. If the two spill oil before the alignment, it means that the fuel supply advance angle is too large and the fuel supply is too early. If the oil spills, the oil supply angle is small and the oil supply is too late.
It is worth noting that a special glass tube and pointer should be installed for the multi-cylinder.
Shandong Shunhang Generator Rental Co., Ltd. has a complete range of generator models and stable quality. Shunhang generator sets range from 50KW to 5000KW. We have dozens of generator sets to meet customer demand for electricity. Highway, tunnel, bridge construction, municipal engineering, real estate engineering, factories, restaurants, shopping malls, enterprises and institutions. At any time to provide our customers with a variety of imported and domestic brands of diesel generator sets.
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