⚫️ What is an oil screw compressor?
As mentioned, the screw air compressor is a subset of rotary compressors. The way these compressors work is in such a way that the air enters the air-making part from around the device. This part has two spiral rotors that are always rotating. When the air enters the device and reaches the spiral rotors, it undergoes a drastic reduction in volume and their kinetic energy increases drastically, and finally they enter the air storage tank.
As their name suggests, in oil screw compressors, which are also known as screw oil-injected compressors, oil is used to cool the compressed air, lubricate the rotors and shell, and also prevent pressure return. The output pressure from the air generator units in oil screw compressors must be at least 4 bar to be able to circulate the oil inside the air generator unit (air end block) and ultimately cause cooling and lubrication of the rotors and have the maximum possible efficiency and effectiveness. .
⚫️ Difference of Oil Screw Compressors and Dry Scrown Compressor
In screw oil-free or dry or oil-free compressors, unlike screw oil-injected compressors, there will be no oil inside the air conditioner. The absence of oil in these compressors causes the output air temperature to rise sharply, and when pressures above 3 to 4 bar are required, it is necessary to increase the pressure in two stages by means of two-stage aerators. Other differences of the oil screw compressor include the following:
An oil screw compressor can produce 10 to 25 cubic feet of air per minute, while an oil-free screw compressor can produce a maximum of 5 cubic feet of air.
The working pressure of screw compressors with oil is higher than the working pressure of screw compressors without oil.
The maintenance and repair conditions of oil-free compressors are more difficult and expensive than oil-based compressors.
The oil screw compressor is able to work in high temperature and harsh conditions, while oil-free compressors may have limitations.
Oil screw compressors can be up to 3 times more expensive than oil-free compressors
The lifespan of oil-filled screw compressors is much longer than oil-free screw compressors.
⚫️ The Benefits of Using Screw Oil Compressor or Oil
As it was said, the screw compressor has two types of oil and free oil, which have many differences and can show different efficiency in mixed conditions. Using oil compressors can have many advantages, the most important of which are as follows.
Lubricating the bearings in this type of air compressor is much easier than other compressors.
Since there is always oil inside the air conditioning unit, the rotors are always in contact with the oil and have a balanced temperature.
Air return is prevented due to the filling of empty volumes in Irand.
The rotors are sealed at the beginning and end by the body
Due to the fact that the oil absorbs a significant amount of air temperature, the heat and temperature of the compressed air decreases.
Considering that there is oil between the rotors, the friction between them is prevented.
The noise level of these compressors is much lower compared to piston compressors.
It can be used for many different industries and jobs that require a lot of air pressure.
⚫️ Technical Specifications of Oil Scrown Compressor
In these compressors, due to the constant engagement of moving parts, creating friction and heat, as well as the constant need to lubricate the bearings and rotors, oil and air must enter the air conditioner. After the mixture of oil and air is taken out of the compressor, it is separated by a separator and returns to the compressor after purification and cooling in the radiator. The oil increases the efficiency and effectiveness as well as the pressure of the compressor, and since it absorbs the temperature of the engine parts, it increases the lifespan of the compressor parts. There may be small amounts of oil in the air produced by this air compressor, so businesses and industries that do not have a problem with these small amounts of oil can use this type of compressor. Of course, for highly sensitive tasks, microfilters can be used to absorb micron oil particles, but these filters must be changed and cleaned regularly to produce high-quality air.
⚫️ Main Parts Parts Oil Scrown Compressor
In general, both oil and oil-free compressors have many parts, which have different applications. The most important parts of these compressors include the following
Screw compressor air block (Airend), whose useful life usually depends on the speed of the electric motor.
OIL COOLER AND AFTER COOLER, which are used to cool different parts of the compressor.
The pressure valve and the unloader valve, which are placed in the air stream, but operate completely separately from each other. The unloader valve is installed on the air inlet of the compressor and has the task of adjusting the air, and the minimum pressure valve has the task of controlling the pressure.
Electrical panel (PLC or analog) which is responsible for connecting and disconnecting the screw compressor
The electric motor of the compressor, which is the main component of the compressor, and the quality of the compressed air produced depends on it.
