What is medium speed diesel engine?
Diesel engines can be simply defined as an internal combustion engine, these engines have been highly developed over the years and are used for various systems and devices, including lawn mowers, cars, and electric motors. and diesel generators etc. are in the industry.
Medium speed diesel engine in Dubai
A medium speed diesel engine is any type of internal combustion engine in which air is condensed to a high temperature and ignites diesel fuel (gasoline) injected into a cylinder. This triggers the combustion and expansion of a piston. A diesel engine converts the chemical energy stored in the fuel into mechanical energy that can be used to power trucks, large tractors, trains, and ships. A limited number of cars, as well as some electric generators, run on diesel fuel.
About medium speed 4 stroke diesel engine in UAE
In general, motors with a rotation speed of 300 to 1000 rpm are classified as medium speed motors. However, the actual definitions are that engines that do not require a reduction gearbox are defined as low speed engines and marine diesel engines in Dubai that require a reduction gearbox are defined as medium speed engines.
Advantages of using a medium speed diesel engine in Dubai
This motor is light and compact in terms of its output, so it is effective for use in rigging and is less expensive than low-speed motors with the same output. In addition, since this engine also has the advantage of freely selecting the propeller speed through a reduction gearbox, it is suitable for use as the main engine in certain types of vessels such as fishing vessels, tugboats and ferries.
Types of diesel engines in UAE
In general, diesel engines can be classified into different categories, based on power, name or brand, the number of cylinders, which in terms of power are single-cylinder, two-cylinder, and three-cylinder engines in small dimensions to engines Divided four, six, eight and 12 linear cylinders for large and industrial use. Single-cylinder engines, which are usually used for low powers, have a simpler structure and smaller dimensions.
Types of diesel engines based on usage
Diesel engines are divided into the following categories based on usage:
1. Small diesel engines
These engines, whose structure is single-cylinder, are available from small power to 15 to 20 kava power, which are mostly used in homes, villas, and single-phase applications. These diesel engines usually have a power of 30 horsepower. Steam is also available, examples of this diesel engine are single cylinder stream engines.
2. Medium engines for semi-industrial and workshop use
These diesel engines, whose structures are available in two-cylinder, three-cylinder, and four-cylinder types, are available for all kinds of workshop and semi-industrial uses, which usually supply up to 100 kava. Yanmar diesel engines mentioned.
3. Diesel engines for industrial use
Diesel engines that can be used for industrial purposes and huge power plants are usually six-cylinder, eight-cylinder, and twelve-cylinder engines that are used in the power range of these diesel engines from over 100 kava to 1 to 2 megawatts. Cummins and Perkins engines are considered to be prominent examples of these diesel engines.
Medium speed diesel engine components in Dubai
Medium speed diesel engine components in Dubai include the following:
1. Injector pump
The injector pump is one of the most important components of a medium speed diesel engine, which is responsible for regulating the amount of fuel entered and the pressure required for spraying and injecting fuel.
Injector is one of the most important components of medium speed diesel engine. This part works in such a way that it sprays and pulverizes the fuel and helps to improve its combination with air and fuel.
3. Fuel filter
This part filters and refines fuel and prevents damage to medium speed diesel engine parts in Dubai.
4. Fuel pipes
These pipes are responsible for delivering fuel from the tank to the medium-speed diesel engine, which must withstand the pressure and heat of the fuel.
5. Turbo charging
This device increases the oxygen entering the cylinder of the diesel engine and increases the average speed in the flow, and since the presence of more oxygen improves the combustion, it increases the efficiency of the diesel engine.
Diesel engine power system components in UAE
The components of the power system include the following:
Alternator or in other words alternator can be defined as an electrical generator that converts mechanical energy into electrical energy. The work is done in the form of alternating current (AC). The electrical components consist of a rotating magnetic field with a fixed armature, which makes the design simpler and cheaper. A car charging system consists of three main parts including battery, voltage regulator or regulator and alternator. Without any of these three parts, the charging system is incomplete. It is better to know that alternators get their name from the term alternating current (AC) because they generate power through an electromagnetic field. This electromagnetic field is formed through the stator and rotor relationship.
• Thermo start
The starter is actually the starter of the diesel generator. In old and light diesel engines, the handle is used to start and rotate the engine. The handle is a one-way lever that goes with placement Its special axis (or crankshaft or valve shaft) can turn the engine and turn it on. Handley diesel engines have a decompression lever so that by removing the compression, the engine can be easily started and after reaching revs. Turned it on properly. The handle has a one-sided spike so that after turning on and pulling away the crank, the handle does not rotate with it and does not cause damage or hit the operator. In some other light engines, the engine is started by a rope.
Some diesel engines have glow plugs. A glow plug is a small electric heater that is installed in the combustion chamber of diesel engines to heat the combustion chamber prior to the combustion process. Heating the combustion chamber allows the engine to start easily in cold weather.
In general, when a diesel engine is cold, the compression curve may not raise the air temperature enough to burn the fuel; So here the glow plug comes with the help of diesel engines to, as mentioned, heat the combustion chamber and the engine can start easily.
Currently, glow plugs are rarely used in large engines. Among the features of heating candles, we can mention long life, reasonable price, use of modern technologies in their manufacture, use of advanced knowledge in the manufacture of parts used in them, and conducting specialized tests inside the factory on the product.
• Coil and wiring and warning lights
The coil, wiring and warning lights are responsible for transmitting power to the various components of the marine diesel engine in Dubai.
Diesel engine cooling system components
The components of the medium speed marine diesel engine cooling system include the following:
The radiator of a gas-burning or diesel generator is one of the types of heat exchangers that are used to reduce the water temperature of gas-burning generators, and the radiator is designed accordingly. This category of industrial generators has two circuits named LT and HT, the temperature of each of which is different from each other. In some designs, the circuits are separated from each other and in most cases both circuits are cooled in one radiator. The basis of this type of diesel generator industrial radiator is air-cooled, which can be obtained based on the ambient temperature. In general, the basis of this device is to prevent the generator oil from increasing too much, which should be at a certain temperature. It should be kept constant between 70 and 80 degrees.
• Water hose and water pump
The water hose and water pump have the task of transferring the heat of the diesel engine to the outside.
Internal parts and skeleton of diesel engine
The internal components of the medium speed marine diesel engine include the following:
The engine cylinder is a part that is cylindrical and has a certain diameter and thickness. Engine cylinders are available in very small sizes (in gasoline-powered cars) and in larger sizes (in ships and warships). This part plays an important role in the engine. In case of failure of the fuel cylinder, it penetrates into the engine and explodes, destroying water and oil. In this situation, it can be said that the other engine is out of order.
• cylinder head
As the name suggests, the cylinder head is a part of the cylinder block. If you look carefully at the cylinder block without side parts, you will notice that its upper surface is open. The cylinder head covers this surface and forms the combustion chamber inside the cylinders. This metal piece, which is one of the fixed components of the engine and is screwed on the cylinder block, in addition to insulating the cylinder, has the task of preventing gases from escaping from the cylinders for proper combustion of the fuel and gas mixture. Also, the cylinder head provides the possibility of temporary fuel injection into the cylinder at the right time and smoke exit from the combustion chamber. In this way, the cylinder head has different channels for fuel and water injection, smoke exit and air entry.
A bush is a hollow cylinder that is used to increase the inner diameter, speed up and facilitate the repair process, and of course for better lubrication and cooling in the reciprocating paths. The cylinder bush is a part that can be seen in all engines, but in some of them this part is connected to the cylinder body and is not cooled directly, but in others, the bush is a separate part that is cooled by water between it and the cylinder body. In some engines, the bush is not in contact with water and it is called a dry bush. On the other hand, in some engines, the bushing is in direct contact with water and is cooled, which is called a cooler bushing.
• Piston and ring
The piston ring is used as a sealing agent to prevent fuel and compressed air from escaping during compression and ignited gas during combustion from between the cylinder and the piston. The figure below shows a type of piston ring. Stay with TurboMag to learn how to measure and check piston ring health.
The gears are among the internal parts of the marine diesel engine in Dubai and are responsible for the power transmission to the wheels.
Diesel engines have a main engine whose task is to produce electricity; These engines have a number of air and smoke valves that are installed on the cylinder head. The engine valve is generally responsible for transferring air, fuel and smoke. These valves control the opening and closing of the cylinder path, the entry of air into the combustion chamber and the exit of smoke from the cylinder head valves. If there is no generator engine valve or if it is damaged and worn, it will cause the engine to choke. For this reason, the existence of these parts in the generator engine is considered very important. In the following, we will get to know how this part works.
• Oil pump or oil pump
The diesel generator oil pump is one of the most important parts of the generator engine, whose function is It has a direct effect on the device's performance, and you should pay attention to its health when buying a diesel generator. That is, if the oil pump does not work properly, it can damage the device or completely cause the device to fail.
• Propeller belt
The propeller belt is one of the most important consumables in marine diesel engines in UAE, which transmits the drive power to the alternator, compressor, etc. If this belt fails for any reason, the performance of various engine components will be affected. Therefore, the importance of health and its quality in cars cannot be ignored.
The marine diesel thermostat in Dubai acts as a one-way valve and controls the flow and temperature of the water output from the diesel engine, which is installed at the water outlet of the diesel engine (cylinder head) and in its place. When the engine is cold and the coolant temperature is low, the thermostat valve is closed and does not allow water to exit the engine and enter the radiator.
• Water pipes
The role of water pipes in the UAE marine diesel engine is that the cooling solution inside the radiator (combination of radiator water and antifreeze) reaches the water pump through the bottom pipe of the radiator. The water pump takes its power from the front of the diesel crankshaft through a belt and pulley, and when the diesel generator starts working, it draws the solution inside the radiator and quickly pumps it into the channels of the cylinder block. The water passes through the cylinder ducts and around the bushings and takes their heat, then it enters the cylinder head through the cylinder head cavities and by flowing through the ducts around the valves and other parts, it also absorbs their heat. From the cylinder head, it reaches the front part of the cylinder head. In this part, there is a thermostat, which, if the water temperature is low, directs it again through the bypass channel for recirculation in the diesel engine, and if the water temperature is higher than a certain limit, the thermostat opens. and hot water goes to the inner part of the radiator and is transferred to the bottom through the networks, where it is cooled and loses its heat during the passage by the air flow that is fed to it by the cooling fan.
• Air intake and smoke exhaust systems
Many factors and technical issues of diesel engine can be recognized from the color of diesel exhaust smoke, which we briefly describe here the types of diesel smoke color and their reasons. The smoke and exhaust valve is directed out of the engine. Complete and correct combustion has the lowest amount of smoke, which mechanics say the engine works without smoke. If the combustion is incomplete in the diesel engine, colored smoke and polluting gases will come out of the diesel exhaust. The color of the smoke coming out of diesel engines is a good sign to recognize the working condition of the diesel engine. The exhaust smoke appears as black, white and blue, which every The color of the smoke has a reason.
• Auxiliary systems
Auxiliary systems are another internal component of marine diesel engines in the UAE that facilitate the process of movement and engine speed.
• Steel chassis supporting the diesel engine
The steel chassis supporting the marine diesel engine or anti-vibration is one of the accessories of the diesel generator, which reduces the impact and noise caused by the diesel generator to the foundation and installation surfaces and increases the life of the device. The steel chassis supporting the diesel engine is usually placed between the diesel and the generator under the diesel and generator bases and on the diesel generator chassis. Also, different types of steel chassis supporting the diesel engine are used to withstand different pressures and are resistant to a certain temperature.
Diesel engine operation
The working of four-stroke engines is as follows:
• Suction of air or oxygen into the cylinder
• Condensation or compression
• Power or fuel injection and explosion
• Evacuation of materials or smoke resulting from the explosion
Medium speed marine diesel engines in Dubai
The engine speed in diesel engines, which is also referred to as RPM, determines the number of revolutions of the engine in one minute, and in the meantime, the engine speed in diesel engines has a different value based on the operation of the engines. And the amount of power received and also the duration of use are different, diesel engines in terms of the number of revolutions are directly related to the number of engine bridges, in other words, diesel engines of 3000 revolutions, which are often used in low powers and electric motors It can be 2 bridges, if the 1500 rpm engines have 4 bridges, the Thousand rpm engines, which are mostly seen in gas engines, have 6 bridges, and the 750 rpm diesel engines, which are more of a power plant aspect and are always working. Compared to the 1500 and 3000 rpm engines, it has 8 bridges, and in terms of dimensions, these engines are bigger than the other mentioned diesel engines.
It should be noted that in diesel engines, the amount of losses must also be taken into account in order to couple it with the generator, that is, the efficiency of the engines is affected by the height above sea level as well as the ambient temperature and reduces the efficiency of the engine. .
To buy a medium speed marine diesel engine from the Dubai Marine website, just call the phone numbers listed on the site so that our experts can register your order and answer your questions about the products.