How to choose a suitable oil-free air compressor?
Views : 1072
Author : Runningway
Update time : 2020-08-17 15:00:42
Since the oil-free silent air compressor uses oil-free self-lubricating technology, its core components, piston rings and bearings, have high requirements on materials, and it has been difficult to solve them well. With the advancement of science and technology, some special wear-resistant materials have been applied, and this technological barrier has been broken through. In less than 10 years, the oil-free silent air compressor was first born in Europe. Because of its environmental protection, energy saving, ultra-low noise, no oily substances, fresh compressed air quality, cleanliness, safety and durability, it is used in European and American countries. Has been widely promoted and applied.
First of all, we must understand what an oil-free silent air compressor is and understand its working principle.
Silent: It belongs to a miniature piston air compressor. When the crankshaft of the air compressor is driven by a single shaft of the motor, the working volume formed by the inner wall of the cylinder, the cylinder head and the top surface of the piston will change periodically through the transmission of the connecting rod.
Piston movement process of piston air compressor:
When starting to move from the cylinder head, the working volume in the cylinder gradually increases
The gas moves along the intake pipe, pushes the intake valve open, and enters the cylinder until the working volume reaches the maximum, the intake valve closes
When the piston of a piston air compressor moves in the reverse direction, the working volume in the cylinder decreases and the gas pressure increases
When the pressure in the cylinder reaches and is slightly higher than the exhaust pressure, the exhaust valve opens and the gas exits the cylinder until the piston moves to the limit position, and the exhaust valve closes.
When the piston of the piston air compressor moves in the reverse direction again, the above process repeats. Namely: the crankshaft of the piston air compressor rotates once, the piston reciprocates once, and the process of air intake, compression and exhaust is realized in the cylinder, which completes a working cycle. The structure design of single-shaft and double-cylinder makes the air flow of the air compressor double that of the single-cylinder when the rated speed is constant, and the vibration and noise control is well controlled.
The general classification of air compressors has the following methods:
1. According to the gas transmission volume, the so-called gas transmission volume refers to the volume of the gas discharged per minute when the air compressor is working, converted to the suction state. The small-scale displacement is below 10 cubic meters/minute, and the medium-sized 10-100 cubic meters/ Points, large 100 cubic meters/min or more.
Domestic models have 0.3, 0.6, 0.9, 1.6, 3, 6, 9, 10, 12, 20, 40, 60, 100 exhausts per minute, of which minicomputers and microcomputers account for a large proportion, more than 100 The super-large size is rare, and is limited in size and weight. Piston air compressors with a displacement of more than 100 are unreasonable.
2. According to the structure type, there are rotary type, piston type and membrane type.
Among them, screw type and sliding vane type in piston type and rotary type are more common. The domestic piston type accounts for 95% of the output, while the foreign screw type accounts for more than 90%. Each of these three types of air compressors has its own advantages and disadvantages.
The screw air compressor has high manufacturing cost due to the complex rotor profile, but its advantages are small size, light weight, and small parts. In the case of the same displacement, the screw type air compressor is more expensive than the piston type, and its maintenance requires specialized knowledge and experience.
3. According to the cylinder center line and relative position, the vertical type, horizontal type and angle type are divided into V type, W type and L type.
Generally speaking, because the piston type air compressor is a reciprocating machine, there is a certain amount of vibration, and the angle type can better balance its inertial force. Therefore, most of the small and medium piston type air compressors are made into an angle type, only for vehicles and ships. Air compressors are limited by the floor space, and the horizontal type is a type of air box type air compressor. It is the initial product of the industrial generation and has no advantages. It is almost no longer produced.
4. According to the cooling method:
Air compressors can increase the temperature rise during gas compression and must be cooled. Generally, each stage of compression must have an intercooler, so according to the cooler method, it is divided into water-cooled and air-cooled. The water-cooled type uses tap water open circulation cooling; the air-cooled type uses fan cooling.
5. According to the different classification of the prime mover:
There are electric motor drive and diesel engine drive. The large electric type is equipped with a power distribution cabinet, and the diesel-driven type is started by a battery. Both types of air compressors have direct connection and side connection (ie belt drive).
6. According to the lubrication method:
There are oil-free and oil-lubricated. The latter is divided into splash-type and forced-type (that is, oil pump and lubricator supply lubrication).
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