Diesel Generator Tech

Strengthen the understanding of the oxide film on the surface of   generator   brushes, establish its composition and normal operating conditions: Several recent problems mainly due to the inability to form a smooth layer of the oxide film on the brush surface. The composition of the oxide film requires some conditions. When the conditions are not met, the oxide film cannot be formed or is poorly formed, mainly due to the following reasons: (1) High temperature: The oxide film of electric brushes is generally easy to form at around 70 ℃. When the generator collector ring and brush overheat, the temperature is usually above 150 ℃. Even if a new brush is replaced at this moment, the oxide film is not easy to form and cannot play a smooth role. Brush wear will intensify, causing the temperature to continue to rise, becoming a vicious cycle. At this moment, external forced cooling methods can be adopted, such as applying Vaseline, high-power fan ventilation, etc., to lower the temperature

If our generator set diesel engine experiences a runaway situation, what is the reason and how should we solve it? Below, Dingbo   Power Generation   Equipment will provide a detailed introduction for users to refer to. The diesel engine loses control of speed, suddenly increases, exceeds the maximum rated speed, and makes a loud noise, commonly known as "flying car". The reasons for "flying" include: the fuel injection pump rack is stuck in the maximum fuel supply position. The governor loses its speed regulation function. The viscosity of the oil in the governor is too high or the oil level is too high. The plunger adjustment arm is detached. When "speeding" occurs, the throttle should be quickly closed. If the fuel supply lever cannot return and the diesel engine reaches its maximum speed, it is often due to the throttle lever or throttle arm being stuck. After taking measures to turn off the diesel engine, the cause of the malfunction should be thoroug

Heating during operation is a common malfunction of the brushes and collector rings of Cummins diesel generator sets, which can affect the normal start-up and operation of   Cummins diesel generator sets . There are three types of reasons for heating faults of brushes and collector rings. Below, Dingbo Power Generation Equipment will conduct a detailed analysis. Poor ventilation Poor ventilation is mainly due to blocked cooling air ducts, blocked ventilation channels and holes on the surface of the collector ring, and decreased air volume of the circulating fan. Especially when the surface temperature of the collector ring is too high during operation, the wear of the brushes increases, and the accumulation of carbon powder increases, which may block the heat dissipation channel on the surface of the collector ring. Excessive or uneven distribution of contact resistance The collector ring and brush conduct excitation current through sliding contact with each other, with approximately t

There are many aspects that need to be paid attention to during the maintenance of   Cummins diesel generator sets , such as the maintenance of the cylinder block. One aspect of this is the installation of the cylinder liner seal on the cylinder block, which must maintain a qualified flatness. If the seal surface is uneven, the cooling water from the cylinder block will flow out of the cylinder body from the seal. Some cylinder blocks are equipped with cylinder liner gaskets, and when pressing in the cylinder liner, the cylinder liner gasket must be placed at the stop. When the cylinder body encounters the following problems, Xingguang Power Generation Equipment provides the following suggestions: 1. The main bearing of the Cummins diesel generator set experiences burning of the main bearing, causing deformation of the main bearing seat and even cracking of the bearing seat. The deformation of the main bearing seat can be sent to a professional repair company for repair and restoration

When Volvo generators cannot start normally, the reasons should be found from aspects such as starting work, diesel engine fuel supply system, and compression. Today, let's share the reasons why a   Volvo generator   fails to start properly. To ensure normal operation of a Volvo generator, the first step is to accurately and timely inject well atomized diesel into the combustion chamber, and to ensure that the compressed air in the combustion chamber has a sufficiently high rotational speed and a certain temperature in the cylinder when starting the diesel engine. The ambient temperature is too low. Before starting the Volvo generator, the diesel engine should be preheated properly, otherwise it is difficult to start. The starting speed is low. For manually started diesel engines, the speed should be gradually increased, and then the pressure reducing handle should be turned to a non pressure reducing position to ensure normal compression in the cylinder. If the pressure reducing m

The diesel generator set is a medium-sized diesel generator set in the generator set industry, but its cost-effectiveness is high. The diesel generator set is a special type of mechanical equipment, and the requirements for the surrounding environment are extremely strict during use. Standard diesel generator sets do not have rainproof functions, so it is necessary to pay attention to waterproof work when operating the   diesel generator set , How should we deal with the oil entering the diesel generator set and how should we remove the water? Below is an introduction to Dingbo power generation equipment: 1. After discovering water ingress into the engine oil during the rainy season, we put the engine oil into a test tube for heating. If there is a slight water phenomenon in the engine oil and water bubbles can be observed, it indicates that there is water in the engine oil. At this time, we can use the different boiling points of the engine oil and water to treat it. Continue heating

Volvo diesel generator sets are a type of energy that is very frequently used in China, and some regions abroad have always been used as the main energy source for power generation. In most construction projects in South Africa, Volvo diesel generator sets are used as the main energy source for power generation. A high-quality   Volvo diesel generator set   can bring stable output electricity. Volvo diesel generator sets often encounter voltage instability during long-term use. This situation is relatively common, which is caused by poor contact of some components and other problems during use. Below, Dingbo Power Generation Equipment mainly explains how to solve the problem of high voltage in Volvo diesel generator sets during operation. Generally speaking, the reasons for high voltage mainly include four aspects. 1. The speed is too high. Faced with the problem of high speed, the operator only needs to reduce the opening of the turbine's guide vanes. 2. The iron core gap of the s

The silent diesel generator set is a commonly used mechanical equipment, just like a car. It is idle when not in use, and the car needs comprehensive maintenance and replacement of spare parts at a specific time; Similarly, when maintaining a   silent diesel generator set , it is also necessary to perform maintenance on the equipment itself. Which spare parts usually need to be replaced during the maintenance process? After the unit has been running for a long time, the cylinder liner and piston wear form a conical ellipse, which is usually replaced together. After the piston rings are worn, it is necessary to replace them in groups or as a complete set, rather than just replacing one ring or mixing them with new rings. It is necessary to replace the wet cylinder liner water blocking ring in pairs, otherwise it will affect its sealing performance. The crankshaft main bearing shells and connecting rod shells, as well as the upper and lower tiles, need to be replaced together. It is not

Do you know which situations a diesel generator set cannot start normally? Before starting a diesel generator set, check to see if the diesel generator set is ready. Start the diesel generator set with all the switches and conditions feasible. Note that the situation cannot be started. First, avoid running without cooling water or adding boiling water to start the diesel generator set before adding cooling water, It can cause important components such as hot cylinder liners and cylinder heads to burst or deform due to sudden cooling. Sudden addition of 100 ℃ boiling water to the cold body can also crack the cylinder head and body. It should be added when the water temperature drops to 60-70 ℃. Secondly, if the   diesel generator set   does not supply oil according to regulations, the pressure reducing handle should not be placed in the "working" position before supplying oil. Instead, the throttle handle should be placed in the supply position before starting. The harm of not

Do you know the reason for the burning accident caused by the axial spacing during the installation of   diesel generator   bearing shells? A certain gas turbine generator had a burning accident that was different from the usual situation. The oil blocking ring on the back of the shell had severe friction with the journal flange, causing the entire part of the oil blocking ring to melt and flow into the bearing chamber. The black gold on the back of the working area of the bearing shell also melted within 30mm of the axial direction due to high temperature, and the journal flange was bright black within 40mm of the axial direction. At the same time, due to the large vibration of the bearing pads, the bearing support end cover bolts became loose, and a 3mm gap appeared at the top of the joint surface. The unit tripped and stopped, and there was no rubbing between the rotor and stator during the coasting process. When starting the gas turbine, the rotor needs to move forward by 6.5mm. Wh

During the test run of the diesel generator set after major maintenance, it was found that the lubricating oil pressure was low under both rapid and full speed operating conditions. When adjusting the oil pressure regulating valve, the pressure did not change much. What is the cause of this abnormality? Due to the inspection and careful cleaning of the oil pump, radiator, oil filter, oil cooler, and oil passages during the overhaul of the  diesel generator set , tests were also conducted on the bypass valve, pressure regulating valve, and thermostat, all of which were functioning normally. Moreover, the fit spacing between connecting rod bearing shells and journal components is also within the tolerance range, so the faults of the above components are basically eliminated. After checking the engine oil pressure sensor and pressure gauge, and tightening the wiring, the fault was not resolved during the startup inspection. However, it was found that the lubricating oil gushed out less at

When the turbocharger of a diesel generator set operates at a certain speed, the airflow flow rate of its compressor is reduced to a certain extent due to certain factors. The airflow in the compressor will experience strong oscillation, causing blade vibration and surging noise at the inlet of the compressor, resulting in a significant decrease in intake pressure. This phenomenon is called compressor surge. Surging can lead to unstable operation, reduced power, and black smoke from the exhaust, and in severe cases, it can cause damage to the compressor. Fault cause: (1) Air intake blockage. The surge of the  diesel generator  compressor is mainly caused by blockage in the intake system, such as severe blockage of the air filter element, severe aging and flattening of the intake hose, and blockage of too much oil stains in the intake pipe. Due to blockage, the turbocharger delivers insufficient air to the cylinder during operation, resulting in significant fluctuations in air pressure

  Do you know the drying methods for diesel generator sets after damping? If diesel generator sets are used outdoors or do not take appropriate moisture-proof measures, they are prone to dampness in rainy and snowy weather. However, if the unit is not promptly treated due to moisture, it will seriously affect the performance and service life of the   diesel generator set . The correct method should be to dry the equipment in a timely manner after wetting. Today, two drying methods will be introduced, the oven (furnace) baking method. If conditions permit, the entire motor (stator and rotor are disassembled) will be gradually heated and baked in the oven (furnace). The oven (furnace) should be ventilated to remove moisture from the motor and sandwiched in the middle. The motor discharges in the inner layer and heats in the outer layer. The temperature of the inner layer should be maintained between 90 and 100, and there should be no open flames, smoke, or other flammable and corrosive g

What are the reasons for the poor installation quality of diesel generator bearing accessories causing bearing damage? Firstly, there is oil leakage at the top axle oil pipe joint. During the maintenance of the   diesel generator , it was found that there was oil leakage at the top shaft oil pipe joint, and the bearing shells were slightly crushed and peeled, but the damage was not serious. The top shaft oil pipe joint is located on the lower side of the lower tile and is a hose, with a relatively narrow installation space and difficult to operate. This requires special attention to avoid loose connections and potential complications. The temperature probe of the bearing pad has fallen off, and some bearing pads directly monitor the temperature of the bearing pad's black gold layer. The thermal resistor is directly inserted into a hole 2-3 mm away from the bottom of the black gold layer of the bearing pad, and the probe is supported by a bolt pressing spring. If the bolts are not t

What do you think should be paid attention to when assembling a diesel generator set? The equipment address of the diesel generator set should have excellent ventilation, the generator end should have satisfactory air inlet, and the   diesel generator set   end should have excellent air outlet. The area of the air outlet should be more than 1.5 times that of the water tank. The surrounding area of the diesel generator set equipment should be kept clean to avoid placing items that can cause corrosive gases and vapors such as acid and alkaline in the vicinity. If conditions permit, rescue equipment should be equipped. When diesel generator sets are used indoors, it is necessary to guide the smoke exhaust pipes to the outside. The pipe diameter must be ≥ the diameter of the exhaust pipe of the muffler, and the elbows of the connected pipes should not exceed 3 to ensure smoke evacuation. The pipes should be tilted down 5-10 degrees to avoid rainwater injection. If the exhaust pipe is strai

Do you know what the program for detecting insufficient power of a   diesel generator   is? Firstly, check the fuel injectors for leaks and pitting caused by insufficient primary oil circuit pressure. Check the low-pressure fuel system. Insufficient pressure in the low-pressure fuel system can directly lead to insufficient power and fuel injector pitting. The pressure detection point of the low-pressure oil circuit should be located after the oil outlet of the fine filter. If there is no measurement space at this position, it can be measured in front of the return valve. The following are all reasons for insufficient pressure in the low-pressure oil circuit: whether the secondary filter of the fuel primary filter is blocked, whether the return valve is ineffective, whether there is excessive flow resistance in the oil pipeline from the fuel tank to the fuel pump, and whether the fuel pump provides sufficient supply pressure. Another reason is whether there is excessive flow resistance