Air compressor classification
Air compressor refers to a compressor whose compressed medium is air. It is widely used in machinery mining, chemical, petroleum, transportation, construction, navigation and other industries.
There are many types of air compressors, ranging from small air pumps for automobiles and tractors to large air compressors for mountain mining and mining. The value ranges from several thousand yuan to several hundred thousand yuan.
The general purpose air compressor refers to the national standard, and its exhaust pressure is 0.7MPa, which is commonly referred to as 7 atmospheres or 7 kilograms (in the past, the old national standard is 0.8MPa). The air compressor exhaust is usually mentioned. The pressure is 0.7MPa or 0.8MPa. If it is higher than this or lower than this, it is a non-standard special air compressor.
Air compressors can be divided into two types according to the working principle: speed type and volume type.
The speed type relies on the action of the gas to rotate the impeller at a high speed, and obtains a large kinetic energy, and then rapidly decelerates in the diffusing device, so that the kinetic energy of the gas is converted into potential energy, thereby increasing the gas pressure. The speed type mainly has two basic types: centrifugal type and axial flow type. The volumetric type is achieved by directly compressing the gas to reduce the volume of the gas to increase the pressure of the gas, and the volumetric type is divided into two types according to the characteristics of the piston of the cylinder. Most of the air compressors in the oxygen chamber are volumetric. The rotary piston is used for rotary motion. The piston is also called dry-drying. The number of rotors varies, and the cylinders have different shapes. The rotary type includes a rotor type, a screw type, a slide type, and the like. The reciprocating piston reciprocates and the cylinder is cylindrical. Reciprocating type includes piston type and membrane type, of which piston type is the most widely used type. Most of the air compressors for oxygen chambers use piston type.
Classification, model representation, structure characteristics and working principle of piston air compressor:
Piston air compressors are generally classified by exhaust pressure, displacement (volumetric flow), structural type and structural characteristics.
1. According to the level of exhaust pressure:
Low pressure air compressor
Exhaust pressure ≤1.0MPa
Medium pressure air compressor
1.0MPa<exhaust pressure ≤10MPa
High pressure air compressor
10MPa<exhaust pressure ≤100MP
2. The amount of exhaust gas is divided into:
Small air compressor
1m3/min<discharge amount ≤10m3/min
Medium air compressor
10m3/min<discharge amount ≤100m3/min
Large air compressor
Exhaust volume >100m3/min
The displacement of the air compressor refers to the free gas flow rate in the suction state.
General provisions: shaft power <15KW, exhaust pressure ≤1.4MPa for the micro air compressor.
3. According to the cylinder center line and the ground relative position are divided into:
Vertical air compressor
Cylinder center line is placed perpendicular to the ground
Angle air compressor
The center line of the cylinder is at an angle to the ground (V type, W type, L type, etc.)
Horizontal air compressor
The cylinder center line is parallel to the ground and the cylinder is arranged on the crankshaft side.
Dynamic balancing air compressor
The cylinder center line is parallel to the ground, and the cylinders are symmetrically arranged on both sides of the crankshaft.
4. According to the structural characteristics are divided into:
Single action
Gas is compressed only on one side of the piston
Double action
Gas is compressed on both sides of the piston
Water-cooled
Refers to the cylinder with cooling water jacket, water cooling
Air cooled
The outer surface of the cylinder is cast with a heat sink, air cooled
Fixed
The air compressor unit is fixed to the foundation
Mobile
The air compressor unit is placed on the mobile unit for easy transport
Oil lubricated
Refers to oil lubrication in the cylinder, lubricating lubrication of the moving mechanism
Oil-free lubrication
It means that the cylinder is not lubricated with oil, the piston and cylinder are dry running, but the transmission mechanism is lubricated by lubricating oil.
Oil-free lubrication
No oil lubrication in the cylinder drive mechanism
