The working surface of the piston ring must not be scratched, scratched or peeled off. The outer cylindrical surface and the upper and lower end faces should have a certain smoothness. The curvature deviation should not be more than 0.02-0.04 mm. The standard sinkage of the ring into the groove should be 0.15-0.25mm, and the elasticity and clearance of the piston ring meet the regulations. Additionally, the piston ring light leak should also be checked. That is, place the piston ring flat in the cylinder, place a small light bulb under the piston ring and place a light shield over it, then observe the light. leakage space between the piston ring and the cylinder wall. This indicates whether the contact between the piston ring and the cylinder wall is good. Under normal circumstances, the light leakage space of the piston ring should not exceed 0.03mm when measured with a gaugethickness. The length of continuous light leakage spaces should not be more than 1/3 of the cylinder diameter, the length of multiple light leakage spaces should not be more than 1/3 of the cylinder diameter, and the total length of Multiple light leak spaces should not exceed half of the cylinder diameter, otherwise it must be replaced.
Marking Regulations:
GB/T1149.1-94 piston ring marking states: All piston rings that require installation direction shall be marked on the upper side, that is to say on the side. near the combustion chamber. Rings marked on the top face include: taper rings, internal chamfer rings, external tangential rings, nose rings, offset rings and oil rings with required installation instructions. The top sides of the rings are all marked.
Particular attention mustbe worn when installing the piston rings:
1) The piston rings must be installed flat in the cylinder liner and there must be some opening space at the interface .
2) The piston ring must be installed on the piston, and there must be a certain lateral space in the height direction in the ring groove.
3) The chrome ring should be installed on the first line and the opening should not face the direction of the vortex on the top of the piston.
4) The openings of each piston ring must be offset by 120°C from each other and they must not face the piston pin hole.
5) For piston rings with a tapered section, the tapered surface must face upward when installed.
6) When installing a general twist ring, the chamfer or groove should be upward; when installing an inve twist ringconical rse, keep the cone facing up;
7) When installing the combination ring, the axial socket ring should be installed first, then the flat ring and the wave ring. A flat ring is installed above and below the corrugated ring, and the openings in each ring must be offset from each other.
Functions of the material:
1. Wear resistance;
2. Oil storage;
3. p>4. Corrosion resistance
5. Resistance ;
6. Heat resistance
8. Cutting performance.
Among them, wear resistance and elasticity are the most important. The piston ring materials of high-power diesel engines mainly include gray cast iron, ductile iron, alloy cast iron and vermicular graphite cast iron.
Piston connecting rod assembly, the key points of diesel generator piston connecting rod assembly are as follows:
1. Cu sleevedrunk with interference fit connecting rod. When installing the copper sleeve of the connecting rod, it is best to use a press or vice. Don't hit it with a hammer. The oil hole or oil groove on the copper sleeve must be aligned with the oil hole on the connecting rod to ensure. lubrication.
2. Assemble the piston and connecting rod. Piston assemblyWhen connecting the connecting rods, pay attention to their relative position and direction.
3. Skillfully install the piston pin. The piston pin and pinhole feature an interference fit. When installing, the piston should be placed in water or engine oil and heated evenly to 90℃~100℃. After removing it, place the tie rod in the appropriate position between the holes of the piston pin seat, and then install the covered piston pin. with engine oil in the direction established in the piston pin hole and the copper sleeve of the connecting rod.
4. Installation of the piston rings. When installing piston rings, pay attention to the position and order of each ring.
5. Install the connecting rod group.
How many steps are required to disassemble and assemble the engine?
1. Principle of Diesel Generator: The diesel engine drives the generator to operate and convert the energy from diesel into electrical energy.
In the cylinder of the diesel engine, the clean air filtered by the air filter is fully mixed with the high pressure atomized diesel fuel injected by the injector. Under the upward pressure of the piston, the volume decreases and the volume decreases. the temperature rises rapidly, reaching the ignition point of diesel. Diesel ignites, the gas mixture burns violently, rapidly expands in volume and pushes the piston down, which is called "work".
2. Gasoline Generator: Gasoline engine runs the generator, conveweaving gasoline energy into electrical energy.
In the cylinder of a gasoline engine, the gas mixture burns violently, expands rapidly in volume, and pushes the piston down to do work. Whether it is a diesel generator or a gasoline generator, each cylinder performs work in a certain order. The thrust acting on the piston becomes the force that causes the crankshaft to rotate through the connecting rod, thereby causing the crankshaft to rotate.
By installing the brushless synchronous alternator coaxially to the crankshaft of the electric machine, the rotation of the electric machine can be used to drive the generator rotor. Using the principle of "electromagnetic induction", the generator. will produce an induced electromotive force. The charging circuit can generate current.
Detailed information:
1. For units that have been shut down for more than 24 hours, the test valve should be opened first and the oil pump should be started. For units stopped for more than 7 days, the insulation resistance of the exciter and the operating circuit must be measured and must meet the requirements.
2. Start the fuel pump, release the air into the pipeline and observe whether the voltage is within the specified range. If it is normal, it can be officially launched.
3. Check whether the voltage of the starting power supply meets the requirements. If the voltage is normal, press the start button and release it after the diesel engine has run normally.
4. Once the diesel engine is running, observe the value indicated on the oil pressure gauge. When it exceeds the specified value, stop the oil pump, close the drain valve of the scavenge pump andtighten the front. clutch screw.
5. When the generator starts, it is considered that the generator and all electrical equipment are charged and the human body is not allowed to touch the live parts.
6. After the generator is started, the speed of the diesel engine should be gradually increased and inspected.
7. Gradually adjust the speed of the diesel engine, but when adjusting, pay attention to whether the generator is operating normally. Under normal circumstances, the slip ring and commutator brushes should have no abnormal beating, sparking or noise.
8. Adjust the generator output voltage and frequency. The voltage value should be stable and reach 380V+-10V, and the frequency should reach 50Hz+-0.5Hz.
Baidu Encyclopedia - Generator
1. Disassembly Steps: 1. To disassemble the external body components, first remove the external parts if necessary,then remove the engine and generator and other components. Then remove the intake and exhaust manifolds, remove the cylinder cover, and then remove the fuel pumps on both sides, so that the external engine components are basically disassembled. 2. Disassemble the body components according to the following requirements 1) Remove the cylinder head mounting screws. Note that the screws should be loosened crosswise from both ends to the middle, and the screws should be removed three times. 2) Lift the cylinder head. 3) Remove the cylinder seal and pay attention to the installation direction of the cylinder seal. 4) Loosen the oil drain screw from the oil pan. 5) Turn the engine over and remove the oil pan retaining screws (note that the screws should also be loosened from both ends towards the middle). Remove the oil pan and oil pan gasket. 6) Loosen the primary oil filter fixing screws and disassembleez the oil filter, oil pump gear and oil pump. 3. Dismantle the engine piston connecting rod group 1) Rotate the crankshaft so that the pistons of cylinders 1 and 4 of the engine are at bottom dead center. 2) Remove the connecting rod fixing nuts of cylinders 1 and 4 respectively, remove the connecting rod bearing caps, pay attention to the connecting rod matching marks and put them back in order. 3) Use a rubber hammer or a hammer with a wooden handle to push out the piston rod from cylinders 1 and 4 respectively, grab it at the cylinder outlet with your hand and extract the piston rod, paying attention to the direction of movement. installation of the piston. 4) Reinstall the connecting rod bearing cap, connecting rod bolts and nuts to their original positions. Connecting rods of different cylinders cannot be exchanged with each other. 5) Use the same method to disassemble the piston and connecting rod groupsof cylinders 2 and 3. 4. Remove the flywheel set from the engine crankshaft 1) Loosen the flywheel fixing screw and remove the flywheel. The steering wheel is relatively heavy, so pay attention to safety when disassembling. 2) Remove the front and rear crankshaft seal flanges and oil seals. 3) Loosen the crankshaft main bearing cap fixing screws from both ends to the middle as shown in the manual, and pay attention to the assembly mark and orientation of the main bearing cap. The main bearing caps and the bearings of the different cylinders cannot be interchanged. with each other. 4) Go down