The throttle cannot be slammed after the diesel engine is cold started.

Insufficient cooling water of diesel generators will reduce their cooling effect, and the diesel engine will overheat due to lack of effective cooling; excessive cooling water and oil temperature will also cause the diesel engine to overheat. At this time, the main thermal load of the diesel generator cylinder head, cylinder liner, piston assembly and valve is heavy, and its mechanical properties such as strength and toughness drop sharply, which increases the deformation of the parts, reduces the matching gap between the parts, and accelerates the wear of the parts., In severe cases, cracks and stuck parts may occur. The overheating of the diesel generator will also worsen the combustion process of the diesel engine, causing the injector to work abnormally, the atomization is poor, and the carbon deposit increases. After the diesel generator set is turned off, the circulation of the cooling system water stops, the heat dissipation capacity is sharply reduced, and the heated parts lose cooling, which is easy to cause the cylinder head, cylinder liner, cylinder block and other parts to overheat, produce cracks, or cause the piston to expand excessively and get stuck in the cylinder liner. Inside. On the other hand, when the diesel generator stops without idling cooling, the friction surface will contain insufficient oil, and when the diesel engine starts again, it will aggravate the wear due to poor lubrication. Therefore, the diesel generator should be unloaded before flameout, and gradually reduce the speed, no-load operation for a few minutes. If the throttle is slammed, the speed of the diesel generator will rise sharply, which will cause some friction surfaces on the aircraft to wear severely due to dry friction. In addition, when the throttle is hit, the piston, connecting rod and crankshaft receive large changes in force, causing severe impact and easy damage to the parts. When the diesel generator is cold-started, due to the high oil viscosity and poor fluidity, the oil pump is insufficiently supplied, and the friction surface of the machine is poorly lubricated due to lack of oil, causing rapid wear, and even failures such as cylinder pulling and tile burning. Therefore, the diesel engine should run at idle speed after cooling and start to heat up, and then run with load when the standby oil temperature reaches 40 ℃ or above; the machine should start with a low-speed gear and drive for a certain mileage in each gear in sequence until the oil temperature is normal and the fuel supply is sufficient After that, it can be converted to normal driving. The diesel engine runs when the oil is insufficient. At this time, the insufficient oil supply will cause insufficient oil supply on the surface of each friction pair, resulting in abnormal wear or burns. For this reason, before the start of the diesel generator and during the operation of the diesel engine, it is necessary to ensure sufficient oil to prevent cylinder pulling and tile burning due to lack of oil.

The working principle of silent generator

The working principle of the silent generator is basically the same as that of other generators, but it is different in terms of appearance and internal design. The silent generator usually consists of two main parts: the generator and the sound box. 1. Generator The generator is a device that converts mechanical energy into electrical energy, and it is also the core component of the silent generator. The generator usually consists of two parts, a rotating rotor and a stator. In the generator, the rotor generates electromotive force relative to the stator through the magnetic field, thereby generating electrical energy. 2. Static sound box The sound box is part of the sound insulation design and is usually composed of sound insulation materials and sound insulation structures. The interior of the sound box is divided into two soundproof rooms, one is the engine room and the other is the generator room. The engine room and the generator room are connected by an air passage. A fan blows air from the engine room to the generator room to maintain circulating ventilation. This removes exhaust gases, maintains operating temperature and extends generator life.

Operation process and precautions of oil generator

1. Preparation before starting: (1) Check whether the protective railing covers of flywheel and generator are in good condition; (2) Operators should have a clear division of labor, implement supervision, and wear insulating shoes;

Analysis of Noise Problem of Open-frame Generator

1. noise source The main noise sources of the open-frame generator include the engine, fan, exhaust pipe, oil pump and mechanical noise. Among them, the noise generated by the vibration of the engine is obvious and difficult to solve. 2. influencing factors The size of the open-frame generator noise is affected by the following factors: 1. Generator power size: Generally speaking, the greater the power of the open-frame generator, the noise will be relatively greater. 2. Engine efficiency: A less efficient engine will produce more vibration and noise, so the efficiency of an open-frame generator engine will also have an impact on noise. The noise level of the environment: The noise level of the open-frame generator is also related to the surrounding environmental noise level. If the noise of the environment is large, the noise generated by the open-frame generator will increase accordingly.

Analysis of regular Starting Precautions of Diesel Engine

A diesel engine is an internal combustion engine fueled by diesel. Diesel engines are compression ignition engines, which are often called Diesel engines after the main inventor. The energy released in combustion acts on the top surface of the piston, pushing the piston and converting it into rotating mechanical work through the connecting rod and crankshaft. Precautions for regular starting of diesel engine: Disengage the diesel engine from the transmission device or place the gearbox in the neutral position. Place the parking solenoid, electrical switch and mechanical operating device in the operating position. For a diesel engine with a full-range governor, place the throttle slightly higher than the idle speed position, and for a cold vehicle diesel engine with a two-pole governor when starting, depress the accelerator pedal to the end and release it before the starter motor is engaged Pedal. Note: In order to prevent damage to the starting diesel generator set, the meshing time of the starting motor shall not exceed 30 seconds at a time, and the continuous starting time interval shall be 2 minutes. The diesel oil pressure gauge must show the reading within 15 seconds after starting. When the cold start of the diesel engine, the speed should be slowly increased to ensure that the bearing is sufficiently lubricated and the oil pressure is stable. After 1000r/min idling for 3~5 minutes, the load can be gradually increased. It is strictly prohibited to accelerate the loading operation immediately after starting the diesel engine. Note: diesel engine idle running time is not too long, otherwise it will damage the diesel engine. Because the temperature of the combustion chamber is low at idling speed, the fuel cannot be completely burned, which causes carbon deposits, blocks the nozzle hole of the injector, and blocks the piston ring and valve. If the cooling water temperature is lower than 60°C, the fuel will also wash away the oil on the surface of the cylinder liner and dilute the oil in the oil pan, so that all moving parts cannot be properly lubricated.

Diesel generator battery maintenance tips

Diesel generator set is a diesel engine as the prime mover, drag a synchronous generator power supply equipment. This is a quick start, convenient operation and maintenance, less investment, strong adaptability to the environment of the power generation device. When the battery of the diesel generator set is not used for a long time, it must be properly charged before use to ensure the normal capacity of the battery. Normal operation and charging will cause some water in the battery to evaporate, which requires frequent rehydration of the battery. Before rehydration, first clean the dirt around the filling port to prevent it from falling into the battery cell, then open the filling port and add a proper amount of distilled water or purified water. Do not overfill it. Otherwise, when the battery is discharged/charged, the electrolyte inside the diesel engine will gush out from the overflow hole of the filling port, cause corrosion damage to the surrounding objects and the environment. Avoid the battery starting the unit at low temperature, the battery capacity will not be able to output normally under low temperature environment, and long-term discharge may cause battery failure. The standby generator set battery shall be regularly maintained and charged, and may be equipped with a floating charger. Diesel generator battery maintenance tips: First, check whether the battery charge is normal. If you have a three-use ammeter, after starting the engine, measure the voltage at the two poles of the battery. It must exceed 13V to be normal. Found that the charging voltage is too low, you need to ask professionals to overhaul the charging system. If there is no three-purpose electric meter, visual inspection can be used: after the engine is started, open the battery water filling cover to see if there are any bubbles in each small compartment. The normal situation is that there are bubbles coming out of the water, and the more you add, the more you will take; if you find that there is no bubbling, it is likely that there is something wrong with the charging system. Special attention is to do this test will produce hydrogen, so the inspection must not smoke, in order to avoid the risk of explosion and fire. Second, open the battery and water cap to see if the water level is in the normal position. Generally, there will be upper and lower limit markings on the side of the battery for your reference. If the water level is found to be lower than the lower marking line, distilled water must be added. If distilled water is not available at once, tap water can be filtered for emergency. Water can not be added too much, the standard is to add to the middle of the upper and lower markings. Third, scrub the outside of the battery with a damp cloth to clean the dust, oil, white powder and other dirt that are easy to cause leakage on the panel and pile head. In this way, the battery will not accumulate white acid etching powder on the pile head of the battery, and its service life will be relatively long.

Regular inspection of diesel engine can achieve the effect of fuel saving

Traditional diesel engines have better thermal efficiency and economy. Diesel engines use compressed air to increase the air temperature so that the air temperature exceeds the spontaneous ignition point of diesel. At this time, diesel, diesel spray and air are mixed and self-ignited. Therefore, the diesel engine does not need an ignition system. At the same time, the fuel supply system of diesel engines is relatively simple, so the reliability of diesel engines is better than that of gasoline engines. Because it is not limited by deflagration and the need for spontaneous combustion of diesel, the compression ratio of diesel engines is very high. The thermal efficiency and economy are better than gasoline engines. At the same time, under the condition of the same power, the torque of diesel generator sets is large, and the speed at maximum power is low, which is suitable for the use of trucks. In order to make diesel machinery to achieve the purpose of fuel saving, need to do the following: First of all, regular inspection, timely repair. In order to be diligent in eyes and hands, it is necessary to check the machinery regularly or irregularly, to raise and repair frequently, to firmly establish the concept of "raising is more important than treatment, prevention is more important than repair", and do not let the machinery work with diseases. Secondly, diesel purification. Diesel contains a variety of minerals and impurities. If it is not precipitated, filtered and purified, it will affect the work of the plunger and fuel injector, resulting in uneven fuel supply and poor fuel atomization, which will reduce engine power and increase fuel consumption. Therefore, it is recommended to let the diesel oil stand for a period of time to allow impurities to precipitate, and filter the funnel with a filter screen when refueling. Then is the regular cleaning or replacement of the filter, to achieve the purpose of purification. Then, maintain the water temperature. If the cooling water temperature of the diesel engine is too low, the diesel will burn incompletely, which will affect the power and waste fuel. Therefore, it is necessary to use the insulation curtain properly, and pay attention to the best use of mineral-free soft water for cooling water, such as flowing river water. Finally, do not overload the job. Black smoke is emitted when machinery is overloaded, which is a fuel emission that is not fully burned. As long as the machinery often emits black smoke, it will increase fuel consumption and shorten the service life of parts. Remove carbon deposits. When the diesel engine is working, the polymer is attached to the valve, valve seat, fuel injector and the top of the piston. These carbon deposits will increase fuel consumption and should be removed in time.

Principle of Diesel Generator

In the cylinder, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel sprayed from the fuel injector. Under the upward extrusion of the piston, the volume is reduced and the temperature rises rapidly, reaching the ignition point of diesel. The diesel is ignited, the mixed gas burns violently, and the volume expands rapidly, pushing the piston down, which is called "work '. Each cylinder performs work in a certain order, and the thrust acting on the piston becomes the force that pushes the crankshaft to rotate through the connecting rod, thereby driving the crankshaft to rotate. By installing the brushless synchronous alternator coaxially with the crankshaft of the diesel engine, the rotation of the diesel engine can be used to drive the rotor of the generator. Using the principle of'electromagnetic induction', the generator will output induced electromotive force, and current can be generated through the closed load circuit. Only the most basic working principle of the generator set is described here. In order to obtain a usable and stable power output, a series of diesel engine and generator control, protection devices and circuits are required.

Diesel generator knowledge

Diesel generator refers to a generator driven by a diesel engine, which is composed of an internal combustion engine and a generator fueled by diesel. Among them, when the diesel engine is working, the air sucked into the cylinder of the diesel engine is compressed to a high degree due to the movement of the piston, reaching a high temperature of 500~700 ℃. Then the fuel is sprayed into the high-temperature air in the form of mist, and mixed with the high-temperature air to form a combustible mixture, which automatically ignites and burns. The energy released in combustion acts on the top surface of the piston, pushing the piston and converting it into rotating mechanical work through the connecting rod and crankshaft. The generator is a device that converts the mechanical work provided by the diesel engine into electrical energy. The working principle is based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its structure is: use appropriate magnetic and conductive materials to form magnetic circuits and circuits that perform electromagnetic induction with each other to generate electromagnetic power and achieve the purpose of energy conversion. Due to the large capacity of the diesel generator set, start quickly, easy to operate, can be operated in parallel and continuous power supply for a long time, but also can run independently, not in parallel with the regional power grid operation, not affected by the power grid failure, high reliability, so in most schools in our country, enterprises, government and even families have a very broad application. However, due to the high cost of power generation, diesel generator sets are mainly used as emergency backup power sources, or in areas where mobile power stations and some large power grids have not yet reached. The speed of the diesel generator is usually below 1000 r/min, and the capacity is between a few kilowatts and several thousand kilowatts, especially the units below 200 kW are used more. It is relatively simple to manufacture. The torque output on the diesel engine shaft is periodically pulsating, so the generator works under severe vibration conditions. Therefore, the structural components of the diesel generator, especially the shaft, must have sufficient strength and rigidity to prevent these components from breaking due to vibration. In addition, in order to prevent the uneven rotation angular velocity of the generator caused by torque pulsation, causing voltage fluctuations and causing light flicker, the rotor of the diesel generator also requires a large moment of inertia, and the natural torsional vibration frequency of the shaft system should be compared with the diesel engine. The frequency difference of any alternating component in the torque pulsation is more than 20%, so as to avoid resonance and cause shaft breakage accidents.

Generator unit silencing works

When the operating speed of a generator set is 1500rpm, a noise of 105 decibels will be generated at a distance of one meter from the generator set. In order to avoid noise from the machine room, the silencing project should include the following links: 1. room access door silencer: Each computer room has at least one entrance and exit door. From the perspective of noise reduction, the door of the computer room should not be set too much. Generally, one door and one small door should be set up, with an area of no more than 3 square meters as much as possible. The structure is framed by metal, with high-strength sound insulation materials attached inside and metal iron plates outside. The noise reduction door is closely matched with the wall and door frame up and down. 2. diesel engine air intake system silencing: When the diesel engine is working, there must be enough air intake to maintain the normal operation of the unit. Generally, the air intake system should be set directly opposite the fan exhaust port of the unit. According to our experience, the air intake adopts the forced air intake method, and the air intake passes through the silencer air duct. The blower is drawn into the machine room. 3. diesel engine exhaust system silencer: When the diesel engine is cooled by the water tank fan system, the heat of the water tank radiator must be discharged out of the machine room. In order to avoid noise from the outside of the machine room, the exhaust system must be equipped with an exhaust muffler air groove. 4. room outside the diesel engine exhaust system silencing: After the exhaust air of the diesel engine is silenced by the exhaust silencer duct, there is still high noise outside the engine room. The exhaust air must be silenced by the silencer duct set outside the engine room, so as to minimize the noise. The exterior of the silencer duct is brick wall structure and the interior is sound-absorbing board. 5. diesel engine exhaust muffler system: The exhaust gas emitted by the diesel engine produces a certain amount of noise. We add a muffler to the exhaust gas emission system of the unit. At the same time, the exhaust muffler pipes are all wrapped with fireproof rock wool material, which can reduce the heat emitted by the unit to the machine room and reduce the vibration of the unit, so as to achieve the purpose of attenuating noise.