There are two cooling methods for diesel generator sets: air cooling and water cooling.
1. Wind Cooling Method:
The wind cooling method uses air as a cooling medium to transfer heat from the heated parts of the diesel engine. This cooling method consists of cooling. fan and guide cover, etc.
In order to increase heat dissipation neps, many corrugated fins are usually cast on the outer walls of the cylinder block, cylinder head and each radiator. During operation, the fan rotates to circulate air along the air guide cover to the surface of the cylinder block and cylinder head. As cold air passes through the heat sink, it carries away heat from the cylinder block and cylinder head.
The air-cooled cooling system has a strSimple structure and low weight, but the cooling effect is poor. It is mainly used in small diesel engines and is suitable for areas lacking water.
2. Water Cooling Method:
The water cooling method uses water as a cooling medium to transfer heat from the heated parts of the diesel engine. The characteristic of this cooling method is that it is easy to adjust the cooling intensity when the temperature or workload changes.
There are two types of water cooling methods: open type and closed type. In an open cooling system, the circulating water is directly connected to the atmosphere and the steam pressure in the cooling system is always maintained at atmospheric pressure. In a closed system, water circulates in the closed system and the vapor pressure of the cooling system is higherre at atmospheric pressure. As the temperature difference between the cooling water temperature and the outside air temperature increases, the heat dissipation capacity of the assembly increases. the cooling system is improved.
How to remove the motor assembly quickly and safely?
The heat dissipation outlet of the water tank adopts an electric blind which is linked with the unit. It only takes 2 seconds to open it 90 degrees, the water tank is equipped with an air guide cover to avoid any problems. the heat does not spread and is directly evacuated outside the computer room; the foundation wall is covered with sound-absorbing and flame-retardant cotton to absorb the sound wave frequency of the unit and reduce noise; the interior wall uses perforated aluminum panels for exterior decoration, which not only achieves a beautiful appearance, but also achievesnt a sound absorption effect. The muffler is installed on the roof of the engine room.
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What are the common cooling methods for turbines. generators?
Engine disassembly work is carried out by placing the engine removed from the chassis on the workbench.
1. Place the engine upright and remove the intake and exhaust manifolds and cylinder head outlet pipes.
2. 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; in the order of the rods, and at the same time mark the sequence number, so that they can be put back in order when reassembling, in order to keep the original friction pairs matched and avoid errors.
3.Remove the cylinder head and gasket. The cylinder head bolts and nuts must be removed in the order specified by the original vehicle. If there is no provision, it must be dismantled 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 tool to place it into the valve guide holes on both ends of the cylinder head or the remove gently. by the hand. Note that it is not allowed to use it to insert the cylinder head to avoid damage to the cylinder gasket.
4. Turn the engine on its side and check the clutch. Check for marks on the cover 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 coverclutch assembly and remove the clutch assembly.
5. Pry the starter claw lock joint, 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.
6. Remove the 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 loosen the pliers. valve spring and remove the valve. valve spring and spring seat. The intake and exhaust valves of each cylinder must be placed to avoid confusion.
7. Remove the distribution chamber cover and housingoil.
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 camshaft.
8. Remove the oil filter, oil pump outlet pipe and oil pump.
9. 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 piston rod assembly. 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 scraped flat with a scraper to avoid difficulty lors from removal of the piston and connecting rod assembly and damage to the piston rings. After pushing, immediately reinstall the connecting rod bearing cap and connecting rod with the newly removed connecting rod bolts and nuts to avoid confusion.
10. Turn the cylinder over, remove all main bearing caps and place the bearings in their respective bearing caps, lift the crankshaft assembly, then replace the bearing caps and bearings according to the instructions. their respective serial numbers and lightly tighten the bolts.
11. Remove the flywheel mounting bolts and remove the flywheel from the crankshaft flange.
12. Remove the rear crankshaft oil seal and flywheel housing. The steering wheel mounting bolts are made of alloy steel. The bolt head has a forged ring mark and cannot be mixed.
13. Disassemble the connecting rod group from the pistonnot. Remove the piston ring before loading and unloading the piston ring. If you do not have piston ring loading and unloading pliers, you can use your thumbs to open the ring a little (do not open it too much to avoid the ring breaking). , and use your two middle fingers to protect the outer ring of the piston ring and remove the piston ring.
14. 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. If it is an aluminum piston, the aluminum piston must first be heated to 75-80 degrees in water, and then the piston pin must be milled to avoid piston deformation.
Commonly used cooling methods for turbogenerators are:
(1) Air cooling. It is divided into air cooling oopen and closed circulation air cooling. So-called open-air cooling consists of the fact that in ordinary small generators the generator fan draws cold air into the engine from the factory building, cools each part, and then exhausts it out of the machine . Closed cycle air cooling is used in large and medium sized generators. After the cooling air exited the generator, it was routed under the machine pit, cooled by a set of air coolers, and then driven into the engine by a fan. This air always circulates inside to keep the machine clean.
(2) Water cooling. Generally, it is internal double water cooling, that is, the conductors of the stator winding and the rotor excitation winding are hollow, the water from cooling passes inside the conductors and the stator bore is alwayscooled by air. Although the cooling efficiency is high, the interior of the driver is prone to scaling and clogging.
(3) Hydrogen cooling. It is divided into two cooling methods: external hydrogen cooling and hydrogen water cooling. External hydrogen cooling is the same as air cooling, except the cooling medium changes from air to hydrogen, but the hydrogen cooler is inside the machine. The difference between water-hydrogen cooling and hydrogen cooling is that the cooling water passes inside the stator winding conductor, and the rest is the same as external hydrogen cooling.