Diesel generator maintenance training diesel engine -p66-p70 governor

Diesel generator maintenance training diesel engine -p66-p70 governor
Governor

The diesel generator governor is a device that automatically adjusts the fuel supply to the fuel injection pump. It can automatically adjust the fuel supply of the fuel injection pump according to the change of the external load of the diesel engine, so that the diesel engine can operate at a relatively stable rotation speed, thereby ensuring that the diesel engine will not be over-speeded and will not cause downtime at idle. The physical appearance of the 6135 B-Series diesel engine governor is shown in Figure 2-83.

There are many kinds of regulators, according to the working principle can be divided into mechanical governor, hydraulic governor, pneumatic governor and electronic governor: According to the function head 24361y9s6W æ›° 9 machine aa25 can be divided into single-program speed governor , 2-pole type, full-cycle lifter, limit governor, and dual-use governor. At present, domestic diesel engines use more mechanical governors, and 135 series diesel engines use full-range mechanical governors.

The physical decomposition of the full-scale governor is shown in Figure 2-84.

Diesel generator diesel engine mechanical governor prone to failure are:

1 The moving parts and transmissions are prone to stuck or stuck. The phenomenon of control and other causes the diesel engine to stop or lose speed.

2 After excessive wear of the inner moving parts of the governor, the gap between the parts increases, resulting in unbalanced fuel supply to the fuel injection pump, which makes the speed of the diesel engine unstable.

The parts that are easily damaged by the mechanical governor include thrust bearings, governor springs, and locating pins, as shown in Figures 2-84(d), (f), and Figure 2-85, respectively.

Most failures of mechanical governors are caused by the operator not adding oil to the governor in time. If there is no oil or too little oil inside the governor, it will accelerate the excessive wear of the moving parts and increase the gap between the moving parts. In severe cases, it will directly cause damage to the moving parts.

When the speed of the diesel generator diesel engine is too high and unstable, the high speed limit screw of the governor can be adjusted to make the rotation speed stable, as shown in Figure 2-86. When the idle speed of the diesel engine is too low, the governor can be adjusted. The idle speed limit screw makes the speed stable, as shown in Fig. 2-87: When the idle speed of the diesel engine meets the requirements and the speed is unstable, the low speed stabilizer can be slowly adjusted to stabilize the speed, as shown in Figure 2-88. Note: When adjusting the high-speed limit screw, idle limit screw, and low-speed stabilizer, do not allow too many adjustments at a time, but adjust them until they meet the requirements.

If the maximum speed and the minimum speed of the diesel engine are in compliance with the factory regulations, and the rotation speed is high and low, the fuel injection pump assembly should be disassembled and sent to the pump center. The professional maintenance technicians on the pump test bench to the governor Internal parts are checked. When the internal parts of the regulator are worn out, new parts are generally replaced without repair.

The components that are easily damaged by the governor are the thrust bearing, the governor spring and the internal pin of the governor gear, and sometimes rolling occurs.

When the diesel engine is in operation, relative movement between the contact surfaces of the main moving parts is performed at a relatively high speed.

In order to reduce the friction on the surface of the parts, the diesel engine lubrication system lubricates the surface of the parts by means of pressure and splashing to ensure that the various parts of the diesel engine can work normally. The composition of its lubrication system is shown in Figure 1-2.

From Fig. 1-2, when the oil pump is in operation, the oil is inhaled into the oil pump after preliminary filtration through the coarse strainer, and then the oil pump conveys the oil with a certain pressure to the oil filter (where the excess oil passes through The pressure valve is back inside the oil pan). After the oil passes through the filter, it is divided into two channels: all the way through the centrifugal fine filter and then directly flows back into the oil pan: the other way is filtered in the throw filter (by the bypass valve when the filter element is blocked) into the oil radiator. The cooled engine oil is sent to the transmission gear through the main oil passage of the machine body. The crankshaft moving parts, camshaft journals and bearings, the moving parts of the rocker arm assembly, the remaining moving parts of the crankshaft, etc. are lubricated by oil splashing.

The main functions of the lubrication system are: to reduce the friction between moving parts, to take away some of the heat absorbed by the parts, to flush the surface of the parts, to improve the sealing effect of the parts, and to prevent the parts from rusting and corrosion.

There are three kinds of lubrication methods for diesel generator set diesel engine; one is pressure lubrication. Under the action of oil pump, the oil with certain pressure is sent to the friction part of the part. This method is mainly used to lubricate the friction brown surface that bears a heavy load. , Such as soil bearings, connecting rod bearings and grid arm shaft, etc.; second, splash lubrication, use of oil droplets splashed parts to be lubricated, such as the cylinder wall, timing gear, etc.; third is hybrid lubrication, which is the simultaneous use of pressure And splash two ways to lubricate.

From Figure 1-2, the lubrication system is mainly composed of oil pump,

And accessories.

First, the oil pump

The role of oil pump is to make a certain amount of oil to produce a certain pressure, and then sent to the friction surface of the rotating parts of the diesel engine for lubrication. At present, the oil pumps used in diesel engines are gear type and rotary type.

The 135 series diesel engines and the 6110z, 6120Q, X6130 and 6140B diesel engines all use gear oil pumps.

The 495Q, 6105Q and YC6110Q diesel engines use a rotary oil pump. Here mainly introduces the gear type oil pump.

The gear oil pump is mainly composed of a driving gear, a driven gear, a pump body and a transmission gear. The outline of the 6135 diesel engine oil pump is shown in Figure 2-89.

Diesel generator oil pump fault prone to organic oil pressure drop and oil suction pan coarse filter plug and so on. The reasons for the drop in oil pressure are: too little oil or diesel oil in the oil, severe wear of the oil pump gear, low oil pressure adjustment, blockage of the oil inlet rough strainer on the oil pump, and leakage of the oil line.