Taking a four stroke diesel generator as an example, explain the working principle of a diesel generator. The four strokes of a four stroke diesel generator are called the intake, compression, power output, and exhaust strokes, respectively. The timing phase diagram is a countermeasure used to identify when all four strokes occurred. The various processes of a four stroke generator set are depicted on the phase diagram. At the top of the phase diagram, the piston is positively positioned at the top dead center position. The process that was previously generated is called before the top dead center, and the process that was generated after the top dead center is called after the top dead center. The bottom of the phase diagram shows the piston at the bottom dead center position.

Under the drive of the spindle, the piston moves from top dead center to bottom dead center, at which point the intake valve opens and the exhaust valve closes. Because the volume inside the cylinder increases, the pressure inside the cylinder is lower than atmospheric pressure. Therefore, fresh air enters the cylinder through the intake valve. Due to resistance in the intake mechanism, the pressure of air entering the cylinder is lower than atmospheric pressure. At the end of the intake, the pressure inside the cylinder is approximately 0.8~0.9 atmospheres, and the temperature is between 40~70 ℃. At the end of this process, the more fuel can be injected into the cylinder at most, the more energy released by the combustion program, and the larger the capacity produced by the diesel generator; The piston moves from the bottom dead center to the top dead center, and both the inlet and exhaust doors are closed. The piston compresses the air sucked in on the first stroke into the combustion chamber, causing the temperature and pressure of the air to increase. At the end of this program, the air temperature inside the cylinder is approximately 500-700 ℃, and the pressure is 27-49 atmospheres.

The piston moves from the top dead center to the bottom dead center, and the inlet and exhaust doors remain closed. At the end of the compression process, the fuel injector injects high-pressure fuel into the cylinder and mixes it with high-temperature and high-pressure air. When the temperature is higher than the self ignition point of diesel, combustion occurs on its own, generating a large amount of heat energy, causing a sharp increase in temperature and pressure inside the cylinder. High temperature and high pressure gas drives the piston down, and the connecting rod drives the main shaft to rotate, doing external work. The maximum combustion pressure of this process is about 60-90 atmospheres, and the maximum temperature can reach 1700-2000 ℃. As the expansion process progresses, thermal energy is converted into mechanical energy, and the pressure and temperature of the gas inside the cylinder sharply decrease. At the end of the expansion, the pressure inside the cylinder drops to 4 atmospheres and the temperature drops to 600-900 ℃.

(1) During the power stroke, if there is not enough air to mix with fuel, simply increasing the fuel manifold pressure or fuel volume to inject more fuel will not generate greater power. Insufficient air volume can cause a decrease in power, smoke, high exhaust temperature, and reduce the lifespan of the generator set.

(2) The factors that affect air intake include the smoothness of the air intake channel, the angle and number of bends, and the size of the air intake.

(3) Air enters the intake pipe through the filter, and the airflow is restricted, which reduces the intake volume of the cylinder. Therefore, when the generator set operates in an environment with a high dust content ratio, frequent and regular maintenance of the air filter is necessary.

The piston moves from bottom dead center to top dead center, at which point the intake valve closes and the exhaust valve opens. After the expansion is completed, the gas in the cylinder has lost its ability to do work, which is called exhaust gas. In order to allow fresh air to re-enter the cylinder, it is necessary to exhaust the exhaust gas. The exhaust gas is pushed upwards by the piston and passes through the exhaust valve to the outside of the cylinder. At the end of the schedule, the pressure inside the cylinder is about 1.03-1.08 atmospheres, and the temperature is about 350-600 ℃.

At this point, the piston returns to the top dead center, and the four stroke diesel generator completes one operating cycle, with the main shaft rotating two times. In addition, in reality, the time for the intake and exhaust valves of diesel generators to act is not when the piston moves to the top and bottom dead centers, but when the intake valve opens before the top dead center and closes after the bottom dead center; The exhaust valve opens before the bottom dead center and closes after the top dead center.

Guangzhou Saiwei Energy Technology Co., Ltd. is a comprehensive enterprise specializing in design, production, and generator installation. Guangzhou Saiwei has many years of experience in engineering design and installation services. For many years, Guangzhou Saiwei has been committed to providing every customer with comprehensive products and energy solutions, including technical consulting, whole machine and generator supply, operation training, etc., with leading technology and first-class quality. The product range covers land diesel generator sets, marine generator sets, high-voltage generator sets, etc., and is widely used in industries such as power, communication, iron towers, healthcare, financial systems, data centers, etc. Welcome to inquire: 13302262088