Diesel Generator Tech

The PT pump fuel injection system of a 500 KW Cummins generator set is superior to the inline pump fuel injection system and the distribution pump fuel injection system in terms of power, economy, and environmental protection. The PT pump fuel injection system is a specialized fuel injection system for Cummins K series, N series and other models, and there is already an electronically controlled PT fuel injection system. There are three methods for adjusting the fuel outlet pressure of the PT fuel pump of a  500 KW Cummins generator set . Specifically, as follows: 1. Using a diesel generator and a dynamometer to load the diesel engine, first check the speed at the disconnection point of the governor. When the throttle valve is fully open, increase the load to the rated speed of the diesel engine and observe the outlet pressure of the fuel. When the pressure is below or above the limit value, adjust it according to the following methods: unscrew the maximum opening adjustment screw of t

In this article, we will continue to introduce the debugging of the VE distribution pump for diesel generators. 3. Adjustment of return oil quantity: Check whether the return oil quantity reaches the specified value at the specified speed. The return oil volume and the pressure of the pressure regulating valve in the VE pump of the  diesel generator  have a mutual influence, and both need to be checked repeatedly. 4. Adjustment of full load oil quantity: Set the speed of the diesel generator VE pump to 1900r/min, and under the condition of LDA device inlet pressure of 0.1MPa, tighten the control handle against the high-speed limit screw to check whether the oil supply of the VE pump meets the requirements. Otherwise, adjust the maximum oil supply by adjusting the screw. The oil supply by screwing in the screw increases, while the oil supply by screwing out the screw decreases. At the same time, check whether the difference in fuel supply between each cylinder meets the requirements. In

The preparation work before debugging the VE distribution pump of the diesel generator includes: installing the VE pump on the test bench and injecting diesel with a pressure of 0.035MPa into the inlet pipe joint; Install a pressure gauge with a range of O~1. OMPa between the return pipe joint and the pump body, and connect the return pipe; Connect the high-pressure oil pipe and fuel injector, with a specification of 6 for the high-pressure oil pipe × 2mm, the length of the first and third cylinders is 420mm, and the length of the second and fourth cylinders is 430mm. The injection pressure of the standard fuel injector is (17.2 ± 0.3) MPa, and the diameter of the throttle hole is 0.4mm. The test oil temperature is 38-42 ℃. Additionally, the solenoid valve is powered on with a 10-12V power supply. The debugging requirements for the VE distribution pump of the   diesel generator   are as follows: 1. Inspection and debugging of pre stroke: The specified pre stroke (from bottom dead cente

  Due to its complex structure and shape, as well as a variety of models and specifications, the VE distribution pump for diesel generators is a precision accessory. Therefore, in order to avoid quality problems during use, the following points should be noted: 1. The VE distribution pump model that matches the  diesel generator  should be selected correctly. If the selection and matching are incorrect, the VE distribution pump will not be able to be used or meet the usage requirements. 2. The plunger spring and its guide rod used in conjunction with the VE distribution pump should be correctly selected, and all components such as adjusting washers, upper and lower seats, upper and lower gaskets, pre travel gaskets, support springs, and oil outlet valve gaskets should be adjusted. If the selection is incorrect, the oil pump will not be able to be successfully debugged. 3. During the transportation, storage, and disassembly process of VE distribution pumps, they should be handled with c

  A starter with a gear reducer installed between the armature shaft and the drive gear of the starter is called a deceleration starter. So what are the characteristics of the deceleration starter of   diesel engines ? The main difference between a deceleration starter and a conventional starter is that a gear reduction device is installed between the transmission mechanism and the armature shaft. Through the reduction device, the torque is transmitted to the one-way clutch, which can reduce the speed of the motor, increase the output torque, and reduce the volume and mass of the starter. The deceleration starter of diesel power generation has the following significant characteristics: 1. The power output structure is divided into two parts: the armature shaft and the transmission shaft. The two ends of the armature shaft are supported by ball bearings, with uniform load distribution, long service life, and less prone to wear; The armature is relatively short, making it less prone to b

We would have continued to introduce the components of the diesel engine plunger high-pressure oil pump in the previous article. The following content is about the fuel supply adjustment mechanism, driving mechanism, and fuel injection pump body of the plunger type fuel injection pump. 2. Fuel supply adjustment mechanism. The function of the fuel injection pump fuel supply adjustment mechanism is to change the circulating fuel supply by rotating the plunger according to the changes in  diesel engine  load. The fuel supply adjustment mechanism can be directly operated by the driver or automatically controlled by the speed controller. 3. Drive mechanism. The driving mechanism of the fuel injection pump includes a camshaft and a follower assembly. The front and rear ends of the camshaft are supported on the fuel injection pump body through rolling bearings. The number of camshafts on the camshaft is the same as the number of plunger pairs in the fuel injection pump, and the angle between

Taking the A-type fuel injection pump of a   diesel engine   as an example, the plunger type fuel injection pump is composed of a pumping mechanism, a fuel supply adjustment mechanism, a driving mechanism, and a fuel injection pump body. 1. Pump oil mechanism The pump oil mechanism includes parts such as plunger sleeve, plunger, plunger spring, upper and lower plunger spring seats, oil outlet valve, oil outlet valve seat, oil outlet valve spring, and oil outlet valve seat. The plunger and plunger sleeve constitute the most precise coupling in the fuel injection pump, known as the plunger coupling. It is precisely due to the precise fitting of the plunger coupling and the high-speed movement of the plunger that the fuel can be pressurized. The number of plunger pairs for each fuel injection pump is the same as the number of cylinders matched with it in the diesel engine. The general plunger coupling is made of high-quality alloy steel, which has undergone fine processing and paired grin

The PT fuel injection system of diesel generator is superior to the inline pump injection system and the distribution pump injection system in terms of power, economy, and environmental protection. The PT pump fuel injection system is a specialized fuel injection system for Cummins K series, N series and other models. The basic principle of the  Cummins diesel generator  PT pump fuel injection system is a simple hydraulic principle (Pascal principle). 1. In a fluid filled system, any change in pressure is immediately and equally transmitted to the entire system. 2. The flow rate of a fluid passing through a certain section is directly proportional to the fluid pressure, allowed passage time, and the cross-sectional area passed through. If the flow time and flow cross-section remain constant, the flow rate is proportional to the pressure; If the pressure and cross-section remain constant, the flow rate is directly proportional to time; If the pressure and time remain constant, the flow

The diesel engine distribution pump fuel injection system is similar to the inline type in that it adopts a plunger type fuel injection pump and a mechanical centrifugal speed controller. The fuel injector is connected to the fuel injection pump through an oil pipe, and the fuel injector is a passive fuel injection system; The difference is that the distribution pump reduces the number of plunger pumps (only one plunger coupling), and high-pressure diesel is sent to the injectors of each cylinder in the working order of the distribution rotor. The high-pressure oil pipe must be connected according to the rotation direction of the distribution rotor and the working order of each cylinder during installation. The reduction in the number of distribution pump plungers reduces the volume of the fuel injection pump itself, makes the structure more compact, reduces costs, and the increase in driving speed increases the fuel injection pressure. The driving speed of the distribution pump can re

The starting circuit of the diesel generator has poor contact. Although various instruments are normal, the diesel generator cannot start. Here are some examples: Fault phenomenon: A Deutz F2L513 air-cooled  diesel generator  was originally starting normally, but after a system maintenance work, the diesel engine could not start. Pressing the start switch, the starter basically did not start. Fault diagnosis: It was initially suspected that the battery was out of charge. Due to on-site operations, there was no professional charger available, so power was taken from another device using a grounding method. The power of this device is also a Fl2 port 13 air-cooled diesel engine, which is starting and charging. However, after connecting the wires, the diesel generator still cannot start, and after turning on the start switch, the starter still does not turn. At this point, the operator of the equipment believes that there is a problem with the maintenance personnel's maintenance, whic

The cooling system of diesel generators can be divided into air-cooled and water-cooled according to different cooling media. If the heat from high-temperature components in the engine is directly dissipated into the atmosphere for cooling, the device is called an air-cooled system. The device that transfers this heat to cooling water first and then dissipates it into the atmosphere for cooling is called a water cooling system. Due to the uniform cooling, good performance, and low engine operating noise of the water cooling system, the water cooling system is widely used in   generator sets   at present. 1. The fan blades are broken. If the fan blades break during driving, it will cause severe vibration of the diesel engine due to unbalanced rotation, accelerating the wear of the water pump bearings. If there are no replacement parts, the piece opposite the broken piece can be removed to maintain balance during operation. After removing a pair of blades, the air volume decreases signif

Many accessories such as diesel generator battery energy supplementation and air conditioning systems need to be driven by the transmission belt V. Therefore, the V-belt is crucial for   diesel engines . The transmission belt is not in good condition, and diesel cannot work properly. 1. Check the condition and tightness of the drive belt: Check that the drive belt is not damaged or peeled off. Before the transmission belt breaks, there will be a sliding and grinding sound, and the surface of the transmission belt will show signs of cracking, wear, and peeling. Therefore, careful observation should be made, and if the above phenomenon occurs, the drive belt should be replaced in a timely manner (note the difference: when the tension of the drive belt is not enough, there may also be a slipping sound). When checking the tightness of the fan drive belt, press the middle part of the drive belt with a force of 90-loON with your thumb, and the deflection should be 5-10mm. If it does not meet

When the diesel generator is first started, due to the low oil temperature, the oil circulates through a small cycle, that is, the oil does not pass through the oil cooler and directly enters the oil filter before entering the lubrication related parts of the main oil passage. When the temperature of the diesel engine rises, the thermostat starts to work (open), and the oil begins to circulate in large quantities. After being cooled by the oil cooler, it enters the oil filter and lubricates the relevant parts. This circulation method shortens the preheating time for starting the   diesel engine . 1. Working principle of oil temperature control valve When the oil temperature is below 90 ℃, the temperature control valve opens the oil bypass passage, and the oil enters the oil filter and main oil passage directly without passing through the oil cooler. When the oil temperature exceeds 90 ℃, the temperature control room closes the oil bypass oil passage. At this time, the oil passes throug

The rotary oil pump of a   diesel generator   consists of components such as a casing, inner rotor, outer rotor, and pump body. The inner rotor is fixed to the rotor shaft with a key or pin, and is directly or indirectly driven by the crankshaft gear. The inner rotor drives the outer rotor to rotate together in the same direction. The inner rotor has 4 convex teeth and the outer rotor has 5 concave teeth, so that the inner and outer rotors rotate in the same direction but not synchronously. The tooth profile of the rotor is designed so that when the rotor is turned at any angle, the tooth profile lines of each tooth of the inner and outer rotors can always make point contact with each other. In this way, four working chambers are formed between the inner and outer rotors, and the volume of these four working chambers changes continuously as the rotor rotates. On one side of the oil inlet passage, due to the disengagement of the rotor, the volume gradually increases, creating a vacuum.