1. Principle of Diesel Generator: Diesel engine drives the generator to operate and convert diesel energy 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: The gasoline engine runs the generator, converting gasoline energy into electrical energy.
In the cylinder of the gasoline engine, the mixed gas burns violently, expands rapidly in volume, and pushes the piston down to do work. Whether it is a diesel generator or an 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:
Start-up and running operations:
1 For units stopped for more than 24 hours, the test valve must be opened in first. and the oil pump should be started. For units stopped for more than 7 days, the resistanceinsulation 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 scavenge pump drain valve and tighten 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 startupof the generator, the speed of the diesel engine should be gradually increased and inspection should be carried out before power transmission.
7. Gradually adjust the speed of the diesel engine, but when adjusting, pay attention to whether the generator is operating normally. Under normal conditions, the slip ring and commutator brushes should not exhibit any 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
Generator Installation StepsSteps:
The working surface of the piston ring should not be scratched, scratched or peeled off. The outer cylindrical surface and the upper and lower end surfaces should have a certain smoothness. The curvature deviation must not be greater than. 0.02-0.04mm. L'Standard sag in the groove should not exceed 0.15-0.25 mm, and the elasticity and clearance of the piston ring comply with 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 feeler gauge. 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 several espaThese light leak should not exceed half the diameter of the cylinder, otherwise it must be replaced.
Marking Regulations:
Piston ring marking GB/T1149.1-94 states: All piston rings that require installation direction shall be marked on the upper face, 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 should be paid when installing the piston rings:
1) The piston rings must be installed flat in the cylinder liner and there must be have some opening space at the interface.
2) The piston ring must be installed on the pistonn and there must be some lateral space in the height direction in the segment 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 a tapered inverted twist ring, keep the taper 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 open themtures of 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. Press fit connecting rod copper sleeve. 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 should be aligned with the holeoil on the connecting rod. to ensure lubrication.
2. Assemble the piston and link. When assembling the piston and connecting rod, 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. Installing piston rings. When installing piston rings, pay attention to the position and order of each ring.
5. Install the connecting rod group.
Motor disassembly steps:
Place the motor upright and removez the intake and exhaust manifolds as well as the cylinder head outlet pipes.
Remove the cylinder head cover, remove the rocker arm shaft assembly on the front and rear cylinder heads; remove the ventilation pipe from the crankshaft tube, remove the lifter chamber cover;
Note: Take out the lifters in order, and mark the sequence numbers at the same time, so that they can be put back in order when reassembling, to keep the original friction pairs matched and avoid errors. .
Remove the cylinder head and gasket. The cylinder head bolts and nuts must be removed in the order specified by the original vehicle.
Note: If there is no provision, it should be disassembled evenly from both ends to the middle.
Once all the bolts and nuts are removed, you can use a wooden hammer to tap around the cylinder head to loosen it. Then use a disassembly toolage to place it in the valve guide holes at both ends of the. cylinder head or gently remove it by hand.
Note: It is not allowed to use it to insert the cylinder head to avoid damage to the cylinder gasket.
Turn the engine on its side and check for marks on the clutch housing and flywheel. If there are no marks, they need to be repaired. Then rotate the crankshaft flywheel, remove the eight clutch mounting bolts symmetrically and evenly around the clutch cover, and remove the clutch assembly.
Flatten the starter claw lock washer, remove the starter claw, remove the lock plate, and use a puller to remove the crankshaft pulley and torsion damper. It is not allowed to hit the pulley with a hand hammer to avoid deformation, deformation and breakage of the pulley.
Deletethe valve group.
When the valve is closed, use valve spring pliers to compress the valve spring, use a screwdriver to remove the locking plate (or use needle-nose pliers to remove the locking pin ), then relax the valve spring. pliers and remove the valve and the valve. Spring and elastic base.
Note: The intake and exhaust valves of each cylinder should be placed to avoid confusion.
Remove the distribution chamber cover and oil pan.
Check for marks on the timing gear. If there are no marks, make corresponding marks on both gears. Turn the camshaft timing gear, align the two round holes of the gear with the mounting bolts of the camshaft thrust flange, remove the two bolts, remove the connecting shaft from the distributor and remove the camshaftes.
Remove the oil filter, oil pump outlet pipe and oil pump.
Rotate the crankshaft to the most convenient position, remove the connecting rod nut, remove the connecting rod bearing cover and bearing, push the connecting rod with a wooden hammer and remove the assembly piston connecting rod from the upper part of the cylinder block. If the cylinder is badly worn and there are steps on the upper part of the cylinder wall, it should first be smoothed with a scraper to prevent the piston and connecting rod assembly from difficulty in pushing and damage to the piston rings. piston.
Note: After pushing, immediately reinstall the connecting rod bearing cap and connecting rod with the newly removed connecting rod bolts and nuts to avoid confusion.
Turn the cylinder over, remove all the main bearing caps and place the bearings in their respective bearing caps in turn, lift the assemblye crankshaft, then put the bearing caps and bearings back into the cylinder according to their respective serial numbers and lightly tighten the bolts.
Remove the flywheel mounting bolts and remove the flywheel from the crankshaft flange. Remove the rear crankshaft oil seal and flywheel housing.
Note: The steering wheel mounting bolts are made of alloy steel. The bolt heads have forged ring marks and cannot be mixed.
Remove the connecting rod piston group.
Remove the piston ring before loading and unloading the piston ring. If you do not have a piston ring loading and unloading pliers, you can use the thumbs of both hands to open the ring opening a little (do not open). too much to prevent the ring from breaking), and use Protect the outer ring of the piston ring with your two middle fingers and remove the udder ringyour.
To disassemble the piston pin, first use needle-nose pliers to remove the locking bridge rings on both ends, then use a piston pin cutter to sharpen the piston pin. piston.
Note: If it is an aluminum piston, the aluminum piston should be heated to 75-80 degrees in water first, and then the piston pin should be milled to avoid piston deformation.
Precautions when disassembling the motor:
Disassemble the motor after it has cooled down. Firstly, it is easy to disassemble, and secondly, it avoids deformation during disassembly because the temperature is high. high, the rigidity becomes low and it is easy to deform;
When disassembling the oil pan, be careful not to harden or deform it at high temperatures, otherwise the oil will leak after installation. special tools during disassembly;
The bolts must be removed to avoid breakage or deformationation during disassembly;
Once the engine is disassembled, special tools must be used to test each part and carried out in accordance with the service manual;
For vehicles with noise abnormal and oil burning, after removing the cylinder head, be sure to check whether the multi-cylinder liner is loose.
Please click to enter a description