What are the reasons for the high water temperature of 40kw diesel generator?

Generators usually consist of stator, rotor, and end caps. Brushes. It is composed of components such as machine base and bearing.

The stator consists of a frame. The stator core, the wire-wrapped winding, and other structural parts that hold these parts in place. The rotor consists of a rotor core, a rotor pole (with a magnetic choke.

magnetic pole winding), slip rings, (also known as copper rings. collector ring), fan and shaft and other components. The stator and rotor of the generator are connected and assembled through the bearing, the base and the end cover, so that the rotor can rotate in the stator, and a certain excitation current is introduced through the slip ring, so that the stator becomes a rotating magnetic field, and the stator coil does the movement of cutting the magnetic field lines, so as to generate an induced electric potential, which is drawn out through the terminal and connected in the circuit, and the current is generated.

Since there is a break at the connection between the brush and the rotor, the rotor rotates in a certain direction and generates alternating current, so the home circuit, etc

The water temperature and oil temperature of the diesel engine are too high and can have the following reasons: 1. Failure of the heat dissipation system, such as thermostat failure, water tank blockage, failure of the air collection ring of the water tank, high indoor temperature, good water pump circulation, etc.; 2. Excessive load (has been ruled out); 3. The oil supply advance angle is wrong; 4. The oil radiator and pipeline are blocked; 5. The bearing clearance is too large; 6. The working capacity of the oil pump is poor; 7. Oil filter blockage, etc.

There are many reasons why the water temperature of 40kw diesel generator is too high, especially in summer, the weather temperature is high, and the unit is more prone to the phenomenon of water temperature being too high

1. The water pump loses its pumping effect. When the weather is cold, the small amount of cooling water in the pump body is not drained, and the water between the impeller and the inner wall of the pump body may freeze and expand overnight, so that the impeller cannot rotate. After the diesel engine starts to run, there is no cooling water circulation in the cooling water channel, so that the temperature of the body rises quickly, and the water tank is "boiled".

In addition, if the pin fixing the impeller is broken or loosened, the pump shaft rotates but the impeller does not move, the pump stops pumping water, and the cooling water does not circulate, resulting in high water temperature.

2. Insufficient water in the cooling system. Insufficient cooling water will be caused by the lack of cooling water in the water tank before the diesel engine starts, or the leakage of the cooling system, the insufficient water supply of the water pump, or the blockage of the water channel and heat pipe by scale and dirt.

3. The fan belt slips or breaks, or the blades in the fan are touched and twisted. In this case, the fan belt is too loose and easy to slip, which reduces the speed of the water pump and causes the water temperature of the cooling system to be too high.

4. The gap between the cylinder and the piston is too small. The gap between the cylinder liner and the piston is too small, the piston ring incision gap is too small, the piston connecting rod group is not installed properly, and the cylinder liner is not lubricated, which will cause the friction between the piston group and the cylinder liner to intensify, increase the working temperature, and cause the cooling water temperature to be too high.

5. Thermostat failure. If the thermostat is broken and fails, when the water temperature is higher than 70, the valve cannot be opened or the opening height is not enough, resulting in the cooling water can not be circulated through the radiator and the water temperature is too high.

1. The diesel generator set uses hard water for a long time, and when the generator set is used, the water tank generates temperature, then a large amount of scale will be formed in the water tank and waterway, resulting in poor heat dissipation.

2. There are too many impurities deposited in the waterway of the generator body and cylinder head, which makes the water circulation unsmooth and causes poor heat dissipation.

3. The generator set burns the engine oil seriously, resulting in excessive carbon deposit and poor heat dissipation.

4. Improper operation and use of diesel generators. When starting the diesel generator, you should first use the small and medium throttle to preheat for a period of time, and you can't suddenly increase the throttle and increase the load, otherwise the diesel generator will work rough and the temperature will soar. Or the diesel generator is overloaded for a long time, which will also cause the diesel generator temperature to be too high.

5. The diesel generator overheats due to the late oil supply time.

6. Put into full load operation immediately after maintenance, which causes overheating of moving parts, or jamming due to too small matching gap.

7. Insufficient cooling water, which causes the diesel generator to overheat.

The main reasons for the high temperature of the diesel engine of the generator set are:

1. The generator set uses hard water for a long time, and a large amount of scale is formed in the water tank and waterway, resulting in poor heat dissipation.

2. There are too many impurities deposited in the waterway of the body and the cylinder head, which makes the water circulation unsmooth and causes poor heat dissipation.

3. Serious burning of engine oil, resulting in excessive carbon deposits and poor heat dissipation.

Fourth, improper operation and use. Starting the diesel engine should be preheated with a small and medium throttle for a period of time, and the throttle should not be increased suddenly, and the load should be increased violently, otherwise the diesel engine will work rough and the temperature will increase sharply. Or the diesel engine is overloaded for a long time, which will also cause the diesel engine temperature to be too high.

5. The diesel engine overheats due to the late oil supply time.

6. Put into full load operation immediately after maintenance, causing overheating of moving parts, or jamming due to too small matching clearance.

7. Insufficient cooling water, which causes the diesel engine to overheat.

The ambient temperature is too hot.

Or overloaded.

Insufficient cooling water.

The water radiator is clogged.

Marine generators are better for seawater circulation and heat dissipation, and land is water tanks, so install industrial exhaust fans for better heat dissipation.

Overloaded, or excessive power of electrical appliances.

If the exclusion cycle is not good, it is that the load is too large.

Some technicians like to adjust the outlet water temperature very low when operating the diesel generator set, they think that the water temperature is low, there will be no cavitation in the water pump, the cooling water (liquid) will not be interrupted, and there is an insurance factor in use. In fact, as long as the water temperature does not exceed 95, cavitation will not occur, and the cooling water (liquid) will not be interrupted. On the contrary, if the water temperature is too low, it is extremely harmful to the work of the diesel engine.

It is believed that the water temperature is too low, which will mainly bring the following three harms.

First, the temperature is low, the diesel combustion conditions in the cylinder deteriorate, the combustion period increases after ignition, the engine work is easy to be rough, aggravate the damage of crankshaft bearings, piston rings and other parts, reduce power and reduce economy.

Second, the water vapor after combustion is easy to condense on the cylinder wall, causing metal corrosion.

The third is that the diesel fuel that comes to burn may dilute the engine oil and make the lubrication worse. Fourth, the fuel combustion is incomplete and the formation of gum, so that the piston ring is stuck in the piston ring groove, the valve is stuck, and the pressure in the cylinder is reduced at the end of compression. Fifth, the water temperature is too low, the oil temperature is also low, the oil becomes thicker, the fluidity becomes poor, so that the oil supply is insufficient, and the crankshaft bearing clearance becomes smaller, and the lubrication is poor.

So, what is the water temperature of the diesel generator set?

In winter, the temperature is low, the ambient temperature of the diesel generator set is also low, and the temperature of the coolant will also be low. Therefore, the temperature rise of the coolant of the diesel generator set will be slower, and the temperature of the coolant should be about 80° when the diesel engine exerts the maximum effective power. When using diesel generator sets in winter, the water temperature should be guaranteed to be about 80° when preparing to transmit power to run the load.

Summer temperatures are higher, and this summer has been even more unusual. Some of the high temperatures reach. The coolant of diesel generator sets rises quickly in such a hot season.

Diesel engines are prone to cylinder pulling accidents at 100° water temperatures, so diesel generator sets should stop working or reduce load when the coolant exceeds about 95°.

As long as the water temperature of the generator set does not exceed 95, cavitation will not occur, and the cooling water (liquid) will not be interrupted. Generally, the water temperature is controlled at 80 degrees Celsius. However, some operators like to adjust the outlet temperature very low in the process of using the generator, some are close to the lower limit of the outlet temperature, and some are less than the lower limit, which is very detrimental to the service life of the unit.

1: If the temperature of the power generation group is too low, the water vapor after combustion will easily condense on the cylinder wall, causing metal corrosion.

2: The low temperature of the generator set will cause the burning diesel oil to dilute the oil and make the lubrication worse.

3: The low temperature of the generator set will worsen the diesel combustion conditions in the cylinder, the fuel atomization will be poor, the combustion period will increase after the fire, the engine will work roughly, and the damage to crankshaft bearings, piston rings and other parts will be aggravated, the power will be reduced, and the economy will be reduced.

4: The water temperature of the generator set is too low, resulting in low oil temperature, thickened oil, poor fluidity, and less oil pump, resulting in insufficient oil supply for diesel generators, and small crankshaft bearing clearance and poor lubrication.

5: The water temperature of the generator set is too low, which will lead to incomplete fuel combustion and the formation of gum, which will cause the piston ring to be stuck in the piston ring groove, the valve will be stuck, and the pressure in the cylinder will be reduced at the end of compression.

Therefore, when using the generator set, the water temperature should be controlled at 80, and it should not be too low, because the water temperature is too low may cause the generator set to produce the above five kinds of damage, thereby reducing the service life of the unit, which is not lost.

The hazards of low water temperature to the unit during the operation of the diesel generator set are:

1. The temperature is low, the diesel combustion conditions in the cylinder deteriorate, the fuel atomization is poor, the combustion period increases after ignition, the engine work is easy to be rough, and the damage to crankshaft bearings, piston rings and other parts is aggravated, the power is reduced, and the economy is reduced.

2. The water vapor after combustion is easy to condense on the cylinder wall, causing metal corrosion.

3. Diesel fuel may dilute the engine oil and make the lubrication worse.

4. It is the formation of gum due to incomplete fuel combustion, which makes the piston ring stuck in the piston ring groove, the valve is stuck, and the pressure in the cylinder decreases at the end of compression.

5. The water temperature is too low, the oil temperature is also low, the oil becomes thicker, the fluidity becomes poor, and the oil pump pump volume is small, resulting in insufficient oil supply to the generator set, and the crankshaft bearing clearance becomes smaller, and the lubrication is poor. Many operators are reluctant to operate diesel generators at used speeds, believing that generators that are lower will not fail. In fact, too low a speed can also bring some undesirable consequences, as follows:

1) Too low speed will reduce the output power of the diesel engine and reduce its power;

2) Too low speed will lead to a decrease in the working speed of each component, which will deteriorate the working performance of the parts and reduce the output pressure of the oil pump.

3) Reduce the reserve power of the diesel engine, so that the diesel engine that should be in normal operation is in full load or overload working state;

4) If the speed is too low, the speed of the working machinery of the linkage mechanism will also be reduced, which will reduce the mechanical properties of the work, such as reducing the water output of the pump, reducing the head of the pump, etc.