Yanan Engine
The correct method and precautions for using water in a diesel generator
Since the external ambient temperature of the diesel generator is too low, the The cooling water must be drained 15 minutes after stopping. Do it when it is dropped, but not immediately, otherwise the temperature difference between the fuselage and the external environment will be too large, causing some parts of the diesel generator set to be deformed, thereby affecting the operation. diesel engine performance (such as cylinder head deformation, etc.).
When draining water, you can't turn on the water release switch and everything will be fine. You also need to pay attention to the specific water flow conditions to see if the water flow is smooth and the water is good. the flow becomes smaller or faster and slower. If these conditions occur, it means that the eThe cooling water contains impurities which hinder the normal flow of water. At this point, it is best to remove the water drain switch and let the cooling water flow directly from the body. If the water flow is still not smooth, use hard, thin steel objects such as wire to dredge it until the water flow is smooth.
When the cooling water stops flowing, it is best to shake the diesel generator several times. At that time, the remaining cooling water that is not easy to flow will flow out because of the cooling water. vibration of the diesel engine, thereby preventing the water plug on the cylinder head from being frozen and the cooling water flowing into the oil pan in the future. The operator should also note that if the water drain switch is not removed, the water drain switch must be in the open state after the vwater drain completed to prevent the remaining cooling water from temporarily being able to flow out due to various reasons and freezing. the corresponding parts of the diesel engine.
Confirmation and repair of radiator leaks:
1. Block the inlet and outlet of the radiator, install a gasket from the overflow pipe or drain plug and drive 0.15 to 0.3 kgf/cm² of compressed air. Place the heater in the pool. If there are bubbles, it's a leak.
2. Check with water. When inspecting, block the water inlet and outlet of the radiator. After filling the inlet with water, observe for water leaks. To make it easier to discover small cracks, you can apply some pressure to the radiator or vibrate the radiator. lightly, then observe carefully, water flows from the leak. Welding repair of the radiator Welding repair of the radiator generally uses mechanicalbrazing method. Before welding, wipe off the oil at the welding place, then use a scraper to scrape the new metal layer, then heat it appropriately. Once the soldering iron is heated, dip it into the zinc oxide solution, then apply solder. After bonding, smooth the solder and use hot water to clean the zinc oxide around the solder to avoid corrosion.
3. Welding repair of upper and lower water chambers. If the leak in the upper and lower water chambers is small, you can repair it directly with solder. If the leak is large, use a purple steel sheet. to repair it. When repairing by welding, first apply a layer of solder to one side of the steel skin and the leak area, place the steel skin on the leak area, and then use a soldering iron to heat the outside in order to melt the solder and sodar the surrounding area. firmly.
The correct use of the water tank of the diesel generator set
The water tank of the diesel generator set plays an important role in the whole body of the generator set. Improper use of the water tank will damage the diesel engine and generator and in severe cases may cause the diesel engine to malfunction. Therefore, it is very important to use the water tank of the diesel generator set correctly.
1: Choose clean, soft water
Soft water generally includes rainwater, snow water, river water, etc. This water contains few minerals and is suitable for engine use. Well water, spring water and tap water contain high mineral content. These minerals are easily deposited on the water tank wall, water jacket and water channel wall when heated to form scale and rust, whichdeteriorates the heat dissipation capacity of the motor and easily causes the motor. overheat. The added water must be clean. Impurities in the water will block the water channels and worsen the wear of the water pump impeller and other components. If hard water is used, it must be softened first. Softening methods typically include heating and adding lye (usually caustic soda).
2. Do not start the machine first and then add water.
Some users, in order to facilitate starting in winter, or because the water source is far away, often adopt this method. start the machine first and then add water. This method is very harmful. After the engine is started dry, because there is no cooling water in the body, the engine parts heat up quickly, especially the cylinder head and the water jacket outside the injector of the di engineesel. If cooling water is added at this time, the cylinder head. and the water shirt will do it. It is easy to crack or deform due to sudden cooling. When the engine temperature is too high, the engine load should first be removed and then idle at low speed. When the water temperature is normal, add cooling water.
3. When "opening the pot", avoid burns.
After the water tank is "boiled", do not blindly open the water tank cover to avoid burns. The correct approach is: first let the engine idle for a while, then turn off the generator. Wait for the generator temperature to drop and the pressure in the water tank to drop before unscrewing the water tank cover. When unscrewing, cover the lid with a towel or car rag to prevent hot waterand steam from being sprayed onto your face and body. Never point your head directly at the water tank and look down. Quickly remove your hands after unscrewing it. When there is no heat or steam, remove the water tank cover to avoid burns.
4. Water heating in winter
In cold winter, it is difficult to start the generator if you add cold water before starting, it will easily not start in time during or. after adding water. When the water tank drain chamber and water inlet pipe are likely to freeze, water cannot flow and the water tank may even burst. Adding hot water can, on the one hand, increase the engine temperature to make starting easier, on the other hand, it can try to avoid the freezing phenomenon mentioned above.
5. Antifreeze must be of high quality
The quality of antifreezes currentlyon the market varies and many of them are of poor quality. If the antifreeze does not contain preservatives, it will seriously corrode the engine cylinder head, water jacket, radiator, water blocking ring, rubber parts and other components. At the same time, a large amount of scale will be produced, resulting in poor quality. heat dissipation of the motor and cause motor overheating. Therefore, be sure to choose products from regular manufacturers.
6. Refill the fresh water in time
After filling the water tank with antifreeze, if you find that the liquid level in the water tank has dropped, you only need to add clean fresh water. water assuming no leaks (distilled water is better), because the boiling point of commonly used ethylene glycol antifreeze is high and this evaporates, it is the water contained in the antifreeze. but onlyfresh water. It's worth mentioning: never add unsoftened hard water..
7. Drain the antifreeze in time to reduce corrosion
Whether it is ordinary antifreeze or long-life antifreeze, when the temperature becomes high, it should be released in time, way to prevent Increase corrosion of mechanical parts. Because the preservatives added to antifreeze will gradually decrease or become invalid as the use time increases, and even worse, some simply do not add preservatives, which will have a strong corrosive effect on mechanical parts, so it should release the antifreeze in time according to the temperature conditions, and the cooling pipeline should be carefully cleaned after releasing the antifreeze.
8. Change the water regularly and clean the pipes.
It is not recommended to change the cooling water frequently, because after a period of uselization, the minerals present in the cooling water have precipitated. , unless the water is very old. If the cooling water is dirty, it can block the pipes and radiator. Do not replace it easily, because even though the newly replaced cooling water has been softened, it still contains some minerals. settle in the water jacket and other places to form scale. The more frequently the water is replaced, the more minerals precipitate and the thicker the scale becomes. Therefore, the cooling water should be replaced regularly according to the actual situation. The cooling pipe must be cleaned when replacing. The cleaning solution can be prepared with caustic soda, kerosene and water. At the same time, maintain each drain switch, especially before winter. Replace damaged switches in time. Do not replace them with bolts, wooden sticks, rags, etc.
9. Open the water tank cover when draining water
If you do not open the water tank cover when draining water, although some of the cooling water may flow out, as the The amount of water in the radiator decreases, the water tank is closed, this will produce a certain degree of vacuum, which will slow down or stop the flow of water. In winter, the rooms will be frozen due to the discharge of impure water.
10. It is not advisable to drain the water immediately when the temperature is high.
Before the engine stalls, if the engine temperature is very high, do not stop the engine immediately to drain the water. You must first remove the load and let it run at idle until the water temperature drops. Do not release water before it reaches 40-50°C to avoid the temperature of the outer surface of the cylinder, cylinder head and eAt. the shirt in contact with water does not suddenly fall off due to the sudden release of water and does not shrink suddenly. However, the temperature inside the cylinder is still very high, the shrinkage is small, and it is easy to cause cracks in the cylinder block and cylinder. head due to the excessive temperature difference between inside and outside.
11. Run the engine at idle speed after draining the water in cold winter.
In cold winter, after draining the cooling water from the engine, you should start the engine and let it idle for a few minutes. This is mainly due to the fact that the water pump after draining the water, moisture may remain in the machine parts. After restarting, the body temperature can dry the residual moisture in the water pump and other places to ensure that there is. No water in the engine. Add antifreezel in time and drain the coolant to prevent the water pump from freezing and cracks causing water leakage.
Why install an air cooler on the generator?
? The water tank of the diesel generator set is an important component of the water-cooled engine. As an important component of the heat dissipation circuit of water-cooled engine, it can absorb heat from the cylinder and. prevent the diesel engine from 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.
After starting the diesel generator set and then adding cooling water, it will cause combustion. Hot cylinder liners, cylinder heads and other important components may explode or deform due to sudden combustion and cold. Ofeven, if boiling water at 100°C is suddenly added 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℃ should be added to the diesel engine. preheat it before starting.
Air coolers are installed for cooling purposes.
Principle
Due to the loss of copper and iron when the generator works, the temperature of the iron core and coil will gradually increase. In order to reduce the aging rate of the coil insulation and prolong its service life, the temperature of the coil should not exceed a certain value, for example 100°C. Therefore, measures must be taken to dissipate the heat generated by thecoil and iron core in time to maintain the temperature of the coil insulation not exceeding the specified value. The most commonly used cooling methods include air cooling, hydrogen cooling, and water cooling. Although the effect of air cooling is poor, the air cooling equipment is simple and reliable, so it is widely used in medium and small generator sets.
The function of the chiller
The air cooler uses cooling water to cool the higher temperature air coming out of the generator, then sends it into the generator . In fact, when the generator operates, the heat generated is removed by the cooling water, and the air only acts as a fluid.
Due to the weak air cooling effect, large generators often use hydrogen cooling and refrigerationwater cooling with good cooling effect.