The function of the cylinder is to connect each cylinder and the crankcase into a whole, and provides a support frame for the installation of parts and accessories such as pistons and crankshafts. The performance of the cylinder is as follows: Sufficient strength and rigidity: Sufficient strength and rigidity, low deformation, ensuring correct positioning of all moving parts, normal operation and low vibration and noise. Good cooling performance: The cooling performance is good, and there is a cooling water jacket around the cylinder to allow the cooling water to carry away heat. Wear resistance: ensure that the cylinder has sufficient service life. The upper part of the cylinder is a side-by-side cylindrical tube. At present, most of them are cylinder liners. The lower part of the cylinder is the crankcase, which is used to install the vileebrequin. Various accessories such as generators and engine mounts can be installed externally.
Should the water in the water tank of the diesel generator be added before or after starting? Is there any difference?
The cylinder head is the main component of the diesel generator set. It is used to close the upper part of the body, form the combustion chamber space with the piston and cylinder liner, and ensure the smooth running of the intake and exhaust processes of the diesel generator set, its structure basic is illustrated in Figure 1. The cylinder head is a fixed part of the diesel generator, generally made of cast iron or aluminum alloy. To dissipate the heat, a water jacket is poured inside the cylinder head. The coolant enters the water jacket of the cylinder block from the water tank (or radiator) under the pressure of the water pump, pIt enters the water jacket inside the cylinder head through the water outlet of the cylinder seal, and then is discharged through the water outlet hole on the end face of the cylinder head into the water pipe. water outlet from the cylinder head, and finally return to the water tank.
Cylinder heads have various structural forms and many classification methods.
1. Classification by number of cylinders
(1) Monoblock cylinder head
A monoblock cylinder head means that each cylinder has a separate cylinder covers, such as the cylinder heads of S1100 and S195 single-cylinder diesel generator sets, and the cylinder heads of 190 series multi-cylinder diesel generator sets.
(2) Combined cylinder head
Combined cylinder head, that is, two cylinders share one cylinder head, such as the cylinder head of 135 series diesel generator set and 120 series diesel generator set Unit cylinder head, etc.
(3) Integrated cylinder head
Integrated cylinder head, i.e.-say that every four or six cylinders share a cylinder head. The cylinder head of Cummins series diesel generator sets is currently widely. used. This is an integrated cylinder head.
2. Classification by number of valves
(1) Two-valve cylinder head
There are two valves on each cylinder of the two-valve cylinder head. , that is, the intake valves and the exhaust valves. Two-valve cylinder heads are mainly used for high-speed, small or low-pressure diesel generator sets with smaller bores, such as Cummins diesel generator sets, Steyr series diesel generator sets and Cummins diesel generator sets. the 120 series.
(2) Four-valve cylinder head
The four-valve cylinder head has four valves installed on each cylinder, namely two intake and two exhaust valves. The intake and exhaust passages are arranged on either sideand on the other side of the cylinder head. The air passage arrangement of the four-valve cylinder head is generally of two types: series type and parallel type. In the series-type arrangement, two valves of the same name share an air passage, such as the 190 series.Cylinder head of a diesel generator set; two valves of the same name arranged in parallel are each connected to an independent air passage, like the cylinder head of a 12V150 series diesel generator.
3. Classification according to the materials used
(1) Cast iron cylinder head
Cast iron cylinder heads are generally made of gray cast iron, alloy cast iron or ductile iron, such as Cummins. The cylinder head of the diesel generator is made of gray cast iron.
(2) Aluminum alloy cylinder head
Aluminum alloy cylinder head is characterized by good thermal conductivity and light weight, but its thermal resistance is low, easy to deform and its cost is high. Aluminum alloy cylinder headsnium are currently used in high-speed light-duty diesel engines. For example, the cylinder heads of 12V150 series diesel engines use aluminum alloy materials.
? Diesel generator water tank is an important component of water-cooled engine. As an important component of the heat dissipation circuit of water-cooled engine, it can absorb cylinder heat and prevent diesel. motor against overheating. However, during use, users should pay attention that the water tank of the generator set cannot be without cooling water or add cooling water after starting.
If cooling water is added after the diesel generator set is started, important components such as hot cylinder liner and cylinder head will explode or deform due to sudden combustion and cold. Likewise, if boiling water at 100°C is addedabruptly exposed to a cold body, the cylinder head will crack and the body will break.
Yatong reminds everyone that the correct operation method of the diesel generator water tank is: before starting the diesel generator, cooling water should be added first and hot water of about 60°C should be added to the diesel. engine to preheat it before starting.