What are the types of air compressors? How to choose an air compressor?
1 Working principle of air compressor 1. Intake process: The intake side suction port of screw type must be designed so that the compression chamber can fully inhale, while the screw compressor has no intake and exhaust valve group, and the intake air Only by adjusting the opening and closing of a regulating valve, when the rotor rotates, the space of the groove of the main and auxiliary rotors is the largest when the air is turned to the opening of the inlet end wall, and the space of the rotor and the freedom of the air inlet are free. The air is connected, because the air of the tooth groove is exhausted at the time of exhausting, and the tooth groove is in a vacuum state when the exhaust is finished. When the air is turned to the air inlet, the outside air is sucked and flows into the main and auxiliary rotors in the axial direction. Inside the groove. When the air fills the entire tooth groove, the air intake side end surface of the rotor is turned away from the air inlet of the casing, and the air between the tooth grooves is closed, and the above is the suction process.
2 Air compressor classification Air compressor can be divided into two types according to the working principle: speed type and volume type. The air machine is divided into: 1, speed type; 2, volume type; volume type is divided into rotary type and reciprocating type; rotary type: (1) rotor type; (2) screw type; (3) sliding type. Reciprocating type: (1) piston type; (2) membrane type. Speed type: It relies on the action of gas to rotate the impeller at high speed to obtain larger kinetic energy, and then rapidly decelerates in the diffuser, 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.
3 Air compressor parts Air compressor parts are also called a general term of compressor parts. Air compressors are divided into piston air compressors and screw air compressors according to the working principle. Piston air compressor parts mainly talk about some routines. Accessories, piston air compressor parts are divided into consumable parts, such as piston rings, support rings, valve plates inside the valve block, pistons, piston rods, large head tiles, coolers, etc., durable parts have cylinder blocks, cylinder heads, Seals, brakes, oil pumps, safety valves, etc., and screw air compressors are different from piston air compressors. The working principle of screw air compressors is different from that of piston air compressors. The design is different. The machine's vulnerable parts include oil filter, air filter, solenoid valve, engine oil, etc. The screw of the screw machine air compressor is not easy to be damaged, and the service life is longer. Piston machine parts include: piston, piston ring, connecting rod, crankshaft, bearing bush, cylinder sleeve, valve block, pressure switch, air filter, etc., rotor liquid, air filter, oil filter, oil separator, pressure valve, Temperature control valve, intake valve, radiator, high pressure fuel pipe, main engine, PLC control panel, etc.
4 Air compressor purchase The basic criteria for selecting an air compressor is economy, reliability and safety. First, the exhaust pressure should be considered and the displacement should be considered. The general-purpose aerodynamic compressor discharge pressure is 0.7 MPa, and the old standard is 0.8 MPa. At present, there is an air compressor with an exhaust pressure of 0.5 MPa, which is unreasonable from the point of view of use, because the pressure margin is too small for the pneumatic tool, and the gas transmission distance is slightly far away and cannot be used. In addition, from the design point of view, this compressor is designed to be one-stage compression, the pressure ratio is too large, and it is easy to cause the exhaust gas temperature to be too high, causing the cylinder to deposit carbon, resulting in an accident. If the compressor used by the user is larger than 0.8 MPa, it is generally required to be specially manufactured, and the method of forcibly supercharging cannot be adopted to avoid an accident.
5 Air compressor operating procedures 1. Before the operation of the air compressor, the following issues should be noted: 1. Keep the oil in the oil pool within the scale. Before the air compressor is operated, check that the oil in the oiler should not be lower than the tick mark. 2. Check whether the moving parts are flexible, whether the joint parts are tight, whether the lubrication system is normal, and whether the motor and electrical control equipment are safe and reliable. 3. Before the air compressor is operated, check whether the guards and safety accessories are intact. 4. Check that the exhaust line is clear. 5. Turn on the water source and open each inlet valve to make the cooling water unblocked.
6 Air compressor maintenance 1. Maintenance and maintenance of air intake air filter The air filter of the air compressor is a component that filters out air dust and dirt. The filtered clean air enters the compression chamber of the screw rotor for compression. The particles inside the screw machine are only allowed to filter out within 15u. If the air filter plug is damaged, a large amount of particles larger than 15u enter the screw machine, which not only greatly shortens the service life of the oil filter and the oil separation core, but also causes a large amount of particles to directly enter the bearing cavity, accelerating the bearing wear and increasing the rotor clearance. The compression efficiency is reduced, and even the rotor is bitten and dead.
7 Air compressor fault repair 1. Fault phenomenon: The unit exhaust temperature is high (over 100 °C) The unit coolant level is too low (should be seen from the oil sight glass, but not more than half); the oil cooler is dirty; Oil filter core is blocked; temperature control valve is faulty (component is bad); oil cut solenoid valve is not energized or coil is damaged; oil cut solenoid valve diaphragm is broken or aged; fan motor is faulty; cooling fan is damaged; exhaust duct is not smooth or Exhaust air resistance (back pressure) is large; ambient temperature exceeds the specified range (38 ° C or 46 ° C); temperature sensor failure (Intellisys control unit); pressure gauge failure (relay control unit). 2. Fault phenomenon: The fuel consumption of the unit is large or the oil content of the compressed air is too large. The correct position should be observed when the unit is loaded. At this time, the oil level should be no more than half; the return line is blocked; the return line is installed (with oil The distance separating the bottom of the core) does not meet the requirements.
