Three major reasons lead to the failure of diesel generator set knock cylinder, why

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

There are many factors that affect this situation, and there are not necessarily only three factors.

Diesel generator set knock cylinder reason:

1. Poor fuel combustion. Low injection pressure, injector dripping, poor atomization of fuel injection and late fuel supply will cause poor fuel combustion and cylinder knocking. This type of failure causes a muffled, hoarse knocking sound and is accompanied by engine overheating, black smoke or exhaust pipe discharge, fire and other phenomena.

The injector should be removed for inspection and adjustment, adjust the oil supply time, and replace new parts if necessary to make it comply with the regulations.

2. The oil supply time is too early. When the upward movement of the piston of the diesel generator has not reached the specified injection position, the fuel injector begins to inject fuel, so that the fuel combustion is advanced, and the high-pressure gas in the cylinder hits the piston, making a rhythmic "click, click" crisp knocking sound, reducing the throttle, and the knocking sound is obvious.

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Hello, dear, I'm glad to have your question, what is going on with the intermittent knocking of the diesel EFI engine, help you find out, the reasons for the knocking of the EFI engine are as follows: 1. The oil supply time is too early. When the upward movement of the diesel engine piston has not reached the specified fuel injection position, the fuel injector begins to inject fuel, so that the fuel combustion is advanced, and the high-pressure gas in the cylinder hits the piston, making a rhythmic "click, click" crisp knocking sound, reducing the throttle, and the knocking sound is obvious; Hope mine can help you.

I wish you good health and a happy mood

What about the intermittent knocking of the cylinder in the diesel EFI engine.

Hello, dear, very stupid world is happy to have your question, what is going on with the intermittent knocking of the diesel EFI engine, help you find out, the reasons for the knocking of the EFI engine are as follows: 1. The oil supply time is too early with the old limbs. When the upward movement of the diesel engine piston has not reached the specified injection position, the injector begins to inject fuel, so that the fuel combustion is advanced, and the high-pressure gas in the cylinder hits the piston, making a rhythmic "click, click" crisp knocking sound, reducing the throttle, and the knocking sound is obvious; Hope mine can help you.

I wish you good health and a happy mood

2. Poor lubrication of the cylinder wall. The lubrication conditions are poor, the oil pressure is low or the oil viscosity is too low, the cylinder wall is splashed and the lubrication is poor, the normal lubricating oil film can not be formed between the piston and the cylinder wall, and the piston and the cylinder directly collide and knock the cylinder; 3. During the bending or twisting deformation of the connecting rod, the assembly of the piston connecting rod group makes the piston skew in the cylinder beyond the allowable range, which not only makes the sealing of the dense cavity deteriorate and the lubrication conditions deteriorate, but also causes the cylinder to wear abnormally, so that the piston and the cylinder wall knock and make a sound.

If not, then what may be the cause of the knock cylinder, is it that the diesel car can not run 120 for a long time Zhengzhou Nissan diesel pickup truck knock cylinder, the repair shop said that it was caused by running 120 on the highway, I want to ask if there is such a thing? How to avoid knocking on the cylinder? Note There are two types of diesel engine cylinders:

The first is the fuel knock cylinder, which is caused by the premature injection angle. The oil supply of each cylinder is uneven. The second is mechanical knocking, which is caused by the excessive gap between individual moving parts.

Common causes (1) The gap between the piston and the cylinder is too large. Due to improper repair, the piston and the cylinder fit gap is large, or the gap is too large due to serious cylinder wear. When the engine is low temperature, the piston gap is large, and the cylinder knocking noise is serious, and the piston expands after the engine temperature rises, so that the piston matching gap becomes smaller, and the cylinder knocking noise is reduced or disappears.

2) The piston direction is reversed or the piston is deformed, which destroys the normal clearance between the piston and the cylinder, resulting in the sound of the piston knocking the cylinder. (3) Poor lubrication of the cylinder wall. Poor lubrication conditions, low oil pressure or low oil viscosity, poor splash lubrication of the cylinder wall, normal lubricating oil film can not be formed between the piston and the cylinder wall, and the piston and the cylinder directly collide and knock the cylinder.

4) The connecting rod is bent or twisted and deformed, and the assembly of the piston connecting rod group makes the piston skew in the cylinder beyond the allowable range, which not only deteriorates the sealing and deterioration of the lubrication condition, but also causes abnormal wear of the cylinder, so that the piston and the cylinder wall knock and make a sound. (5) The lubricating oil channel is blocked, and normal pressure lubrication cannot be formed; The connecting rod bearing or piston pin is too tight, causing the piston to collide with the cylinder wall during the movement and make a sound. (6) Serious carbon deposition in the combustion chamber.

When there is too much carbon in the combustion chamber, the compression ratio of the diesel engine increases, the gas pressure and temperature are too high, and the mist diesel injected into the cylinder ignites and burns when it encounters high temperature and high pressure gas, resulting in the so-called detonation. During detonation, the flame propagates outward at an extremely high rate, and even when the gas does not have time to expand, the temperature and pressure rise sharply, forming a pressure wave that advances at the speed of sound. When this pressure wave hits the cylinder wall, it makes a sharp knocking sound.

7) The injection advance angle is too large. When the injection advance angle is too large, that is, the mist diesel fuel is injected into the air earlier to form a combustible mixture, after the engine reaches the normal working temperature, even if the pressure in the cylinder does not reach the normal working pressure at this time, the working temperature in the cylinder is easy to rise to the ignition point of the diesel, so that the combustible mixture in the cylinder is rapidly burned and expanded, and the pressure in the cylinder rises rapidly, and the highest point of the cylinder combustion pressure is advanced due to the rapid expansion of the gas in the cylinder, resulting in excessive pressure in the cylinder, and the horizontal component of the piston increases. The force of striking the cylinder wall increases, resulting in a cylinder knocking sound. (The injection advance angle is too small and has nothing to do with this abnormal noise).

8) The combustion speed of the combustible mixture is too fast, which causes the pressure in the cylinder to be too high, and the piston skirt hits the cylinder wall and there is a cylinder knocking sound. (9) The cylinder gasket is too much or the top surface of the cylinder block is ground too much, resulting in an increase in the compression ratio of the diesel engine (a large compression ratio is a major feature of the diesel engine), causing a deflagration and a knocking sound. @2019

Summary. Hello, I'm glad to answer for you, the reasons for knocking on the cylinder of the multi-cylinder diesel engine are as follows: 1. The oil supply time is too early:

When the upward movement of the diesel engine piston has not reached the specified fuel injection position, the fuel injector begins to inject fuel, so that the fuel combustion is advanced, and the high-pressure gas in the cylinder hits the piston, making a rhythmic "click, click" crisp knocking sound, reducing the throttle, and the knocking sound is obvious; 2. Poor fuel combustion: too low fuel injection pressure, oil dripping from the injector, poor oil injection atomization and too late oil supply time will cause poor fuel combustion and cause cylinder knocking.

3. Wear of the oil outlet valve: After the oil outlet valve is worn, on the one hand, the gap between the pressure reducing ring belt and the inner hole of the valve seat becomes larger, the sealing becomes poor, and the pressure reduction effect becomes worse; On the other hand, the residual pressure in the high-pressure oil pipe is too high, and the oil supply increases, causing the fuel to deflagrate and knock on the cylinder, and the knocking sound is especially obvious when the throttle is reduced. Hello dear, I hope my answer can help you, and I wish you a happy life and good health!!

Hello, I have seen your question, and I am sorting out the answer for you, please wait for a while Oh Kiss, hello, I am happy to answer for you, kiss the multi-cylinder diesel engine knock cylinder for the following reasons: 1, the fuel supply time is too early: when the diesel engine piston upward movement has not reached the specified fuel injection position, the fuel injector begins to inject fuel, so that the fuel combustion is advanced, the high-pressure gas in the cylinder hits the piston, and makes a rhythmic "click, click" crisp knocking sound, reduce the throttle, and the knocking sound is obvious.

2. Poor fuel combustion: too low fuel injection pressure, oil dripping from the injector, poor oil injection atomization and too late oil supply time will cause poor fuel combustion and cause cylinder knocking. 3. The oil outlet valve is worn clearly

After the oil outlet valve is worn, on the one hand, the gap between the pressure reducing ring and the inner hole of the valve seat becomes larger, the sealing becomes poorer, and the pressure reduction effect deteriorates; On the other hand, the residual pressure in the high-pressure oil pipe is too high, and the oil supply increases, causing the fuel to deflagrate and knock on the cylinder, and the knocking sound is especially obvious when the throttle is reduced. Hello dear, I hope my answer can help you, and I wish you a happy life and good health!! Take the bend!!