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1. Composition and classification of diesel generators Diesel generator sets for AC power supply, backup and emergency power generation are widely used in many fields of the national economy such as ships and communications. In recent years, the power shortage caused by economic development and uneven resource distribution, especially in the southern coastal areas, has further highlighted the role of diesel generators in the development of the national economy. From hand-started and manned ordinary units to the direction of automation (self-starting, unattended, remote control, remote signaling, telemetry), low emissions and low noise, the technical equipment level of diesel generator sets is constantly improving. Modern diesel generator sets have the characteristics of flexibility, convenience, high degree of automation, low noise and low emissions. With the continuous development of science and technology, the application of some new technologies and new achievements has made modern diesel generator sets have higher intensification, reliability, stability and good emission characteristics, etc., and continue to meet the higher requirements of modern society. (1) Composition Diesel generator set is a type of internal combustion generator set, consisting of a diesel engine, a three-phase AC synchronous generator and a control system (including automatic detection, control and protection devices). The diesel engine, generator and control system (box) of the mobile diesel generator set are all assembled on a common base; while the diesel engine and generator of the larger power stationary unit are installed on a common base welded from steel, and Fixed on a specially designed reinforced concrete foundation, equipment such as the control system and fuel tank of this unit are usually installed separately from the unit. The flywheel housing of the diesel generator and the front end cover of the generator are directly connected in the axial direction using a shoulder positioning method to form an integrated body, and a cylindrical elastic coupling is used to directly drive the generator to rotate through the flywheel. This connection method is fixed together by screws, so that the two are connected into one body, ensuring that the concentricity of the crankshaft of the diesel engine and the rotor of the generator is within the specified range. In order to reduce the noise, diesel generator sets generally need to be installed with special mufflers. In special cases, the unit needs to be fully shielded. In order to reduce the vibration of the unit, shock absorbers or rubber shock absorbing pads are usually installed at the connections between the main components such as the diesel engine, generator, water tank and electrical control box and the public chassis. (2) Classification and functions There are many types of diesel generator sets, which can be divided into the following types according to their structural types, control methods and protection fun...

How to Check the Working Quality of Cummins Diesel Generator Governor 1.Maintain standards The internal parts of the speed regulator are not allowed to be stuck during operation. The movement of various parts must be flexible, and the matching clearance between parts must meet the technical requirements. 2. Maintenance methods (1) Inspection and maintenance of speed regulating rotor parts: 1) When the flying iron frame and bracket rotate, there should be no jamming phenomenon. The rotor bearing is not allowed to be too loose or blocked or burned out. Otherwise, new parts should be replaced. 2) When the wear of the inner end of the fly iron exceeds 0.3 minutes, it should be repaired by welding repair. 3) When the matching gap between the flying iron seat frame bushing and the telescopic shaft exceeds 0.22mm, the bushing should be replaced with a new one. After the bushing is pressed in, it should be hinged with the telescopic shaft to ensure the matching size with the telescopic shaft. (2) Inspection and maintenance of speed control gear components. . The mating surface of the speed control gear sleeve is not allowed to have major scratches and eccentric wear. When the buffer spring is not equipped, the two should be able to rotate freely. If the buffer spring is found to be greatly deformed or damaged or broken during inspection, it should be replaced with new parts. When the buffer spring is in a free state, there should be a certain gap between the groups, and the gap between each piece should be less than 0.2mm. The transition arc and straight part of the assembled buffer spring should fit closely with the flange of the speed control gear and the shaft sleeve, and the contact length with the outer diameter of the bearing should be greater than half of the circumferential length.

What are the precautions for the design of exhaust system of Diesel generator exhaust system The exhaust of Diesel generator is not only harmful but also high temperature, so the design of exhaust system should be paid special attention If the back pressure of the exhaust system on the engine exceeds the specified value, the performance of the engine will be affected and the maintenance interval will be shortened The shorter the exhaust system, the smaller the resistance (and back pressure), and the bending parts within the system have a significant impact on the resistance. The maximum allowable resistance of the exhaust system is R=450 mmH20: All models except SR.6D 600 mmH20: SR 816 mmH20: 6D The resistance is measured at the outlet of the turbocharger The recommended material for the exhaust pipe is carbon steel pipe (non galvanized) 1.1 Calculation of exhaust resistance and determination of exhaust pipe diameter The exhaust resistance is affected by exhaust pipelines and silencers, etc The exhaust resistance of the pipeline is obtained from the following equation Pipe Diameter Insisde Diameter External Diameter A B 150 200 250 300 350 400 450 500 6 8 10 12 14 16 18 20 155.2 204.7 254.2 304.7 339.8 390.6 441.4 492.2 165.2 216.3 267.4 318.5 355.6 406.4 457.2 508.0

For professional diesel generator manufacturers, all the parts on the diesel engine are well known, so I believe that many unit users do not know what the holes on the top of the diesel engine are for, what are their names, etc. Question, below, the power will introduce the various functional holes of the diesel engine one by one. 1. The drain hole at the lower end of the cooling water pump housing This hole is used to drain water leaking from the water seal between the impeller and casing. Make sure it is unblocked during use, otherwise the leaking water will not drain out and enter the bearing seat, thereby accelerating the damage of the bearing. the 2. The lubricating oil hole on the small end of the connecting rod and the bushing The function of this small hole is to make lubricating oil delivered to the small end of the connecting rod and its bushing in time to lubricate. If this hole is blocked, it will accelerate the wear of the bushing, reduce its service life, and cause the engine to run prematurely. to produce a knocking sound. the 3. Intake and exhaust holes on the radiator box When the engine is working, the rise in water temperature in the closed cooling system will vaporize the cooling water and generate high pressure, which will cause the radiator core tube to burst and leak water. And when the engine load becomes smaller or stops running, the water vapor in the cooling system will condense into water to lower its pressure, and the pressure difference may cause the core tube to be crushed, hindering the normal circulation of cooling water. For this reason, an air vapor valve is provided on the radiator cover, and a public air hole is arranged to communicate with the atmosphere. When the water temperature rises, water vapor is generated in the radiator, the steam valve opens, and the water vapor is discharged from the hole; when the water temperature drops, the pressure drops, the air valve opens, and the outside air enters the radiator through the hole, thus ensuring the radiator The internal pressure is stable. During use, ensure that this hole is unblocked and cannot be blocked, otherwise it will affect the heat dissipation performance of the radiator and engine. 4. The vent hole on the fuel tank cap In order to prevent the fuel in the fuel tank from splashing due to vibration, the escape of oil vapor and the entry of external dust, the fuel tank should be covered and sealed. However, when the oil level is lowered due to fuel consumption, a certain degree of vacuum will be formed in the fuel tank, causing the oil pump to lose its ability to absorb oil; in addition, when the temperature is high, the fuel evaporates, and the oil vapor will cause excessive pressure in the fuel tank. Both of these situations require automatic communication with the atmosphere when there is a pressure difference between the inside and outside of the fuel tank. For this reason, vent holes are provided on the fuel tank cap to balance the air pressure in...

A category of diesel engine electronic control technology. The main advantage of the high-pressure common rail system is that it can change the injection pressure and injection time in a wide range, and realize the electronic control of the diesel engine by considering the oil pressure generation process and the fuel injection control process separately. High-pressure common rail EFI technology refers to a fuel supply method that completely separates the generation of injection pressure from the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an electronic control unit (ECU). It uses a high-pressure oil pump to deliver high-pressure fuel to the public fuel supply pipe, and realizes precise control through the oil pressure in the public fuel supply pipe, so that the pressure of the high-pressure fuel pipe has nothing to do with the engine speed, which can greatly reduce the fuel supply pressure of the diesel engine. degree of change. Common Troubleshooting of High Pressure Common Rail System the 1. The diesel engine of the Synchronize Panel diesel generator cannot start the fault The diesel engine of the diesel generator is a compression ignition internal combustion engine. The smooth start of a diesel engine not only requires a large amount of fuel to be fully atomized and sprayed into the cylinder, but also requires the compressed air in the cylinder to have a certain temperature and pressure, so that the diesel can spontaneously ignite. Therefore, the diesel engine cannot start smoothly, and the reason is generally in the starting system, electronically controlled fuel system, intake and exhaust system or the matching clearance of the diesel engine. Customers can analyze and judge step by step according to the accompanying characteristics of the fault. For the whole vehicle whose starter is controlled by ECU, ECU first checks the neutral signal when starting, and then outputs a current to drive the starter relay. After the relay is connected, the battery drives the starter to start. Focus on checking the following items: neutral switch, starter relay, battery, parking switch. ① Check the position of the switch under the vehicle (should be in the disconnected state). ② Check whether the wiring of the transmission is intact, and try to use emergency start (press the ignition switch for more than 3 seconds). ③ Check whether the battery voltage is too low to drive the starter. ④Whether the starter relay and wiring are in good condition. ⑤ Check whether the starter is burned out. ⑥Whether the ignition switch and start switch are broken. 2. The rail pressure cannot be established The common rail system of diesel generators has high requirements on the fuel oil circuit, and the low pressure oil circuit (fuel tank, coarse filter, fine filter, oil return) and high pressure oil circuit (high pressure oil pump, common rail high pressure oil pipe, fuel injector) must be guaranteed Airtight. If there is ...

3. Problems encountered in practical application of ATS and corresponding product solutions As the economy develops, modern life and modern industry are less and less tolerant of power outages. Foreign industrialized countries (especially the United States) regard ATS products as part of the power supply, and are very cautious about the selection and use of ATS products. In the dual power emergency power supply system, first choose PC-level products, and the switch is not allowed to stay in the middle of the conversion process (that is, without zero position). The purpose is to increase the reliability of the power supply, especially for UPS. Due to the different types of backup power and application environments, the ATS selection should also be different. 3.1 Problem 1: Switch synchronization problem Ordinary ATS is not allowed to transfer with large motor or high inductance load. If the large motor load is switched during operation, it will be subject to huge mechanical stress when the power supply phase gap is large. At the same time, the overcurrent caused by the back EMF generated by the motor may cause the fuse to blow or the circuit breaker to trip. Solution: If you choose an ATS with phase angle synchronous detection and switching function, check whether the two power supplies are synchronized before switching if the two power supplies exist at the same time. When the synchronization detection is qualified, the ATS is allowed to switch. At this time, ensure that the back EMF and the about-to-input The mains potentials used are synchronized so that no inrush currents can blow fuses or trip circuit breakers. 3.2 Question 2: Neutral line switching problem when matching with UPS Ordinary three-phase ATS has three-pole and four-pole classification, but the three-pole switch cannot meet the requirements of my country's power supply system that the incoming ATS must be four-pole switching and four-pole isolation. Although the four-pole ATS can meet the above requirements, it does not take into account the adverse effect of the four-pole simultaneous switching ATS on the user's load, especially the single-phase load in actual use. Since the ATS needs to be switched with load, the UPS will automatically switch to the bypass and cause the load to lose power due to the absence of the neutral line at the moment of switching in actual use. Raised and burned. If you choose an ATS with the function of zero line overlap switching (later clutch first make technology), when the phase line ends are arced during the switching process, this structure can ensure that the zero line will not be separated temporarily; and when the switching is about to end, the phase line At the same time as the arc is drawn at the end, the structure can ensure that the zero line has been reliably contacted. During the whole switching process, the phenomenon that the neutral line is vacated will not occur. 3.3 Problem 3: Maintenance and Repair Problems Once the ordinary ATS is p...