Working principle and related technical knowledge of silent oil-free air compressor

Silent oil-free air compressor working principle and related technical knowledge this technical article is collected and sorted out by Ruian Aite mechanical and Electrical Co., Ltd if it is helpful to you, welcome to reprint, please indicate the source when reprinting 1、 The classification of air compressor 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) slide type Reciprocating: (1) piston type; (2) membrane type 2、 According to the working principle, air compressor can be divided into speed type and volume type Velocity type: it depends on the function of gas in the high-speed rotating impeller to obtain larger kinetic energy, and then it rapidly slows down in the diffuser to convert the kinetic energy of gas into potential energy, so as to increase the gas pressure There are two basic types of velocity type: centrifugal type and axial flow type Volume type: it can directly compress the gas, reduce the gas volume and improve the gas pressure According to the characteristics of the cylinder piston, the volume type can be divided into two types: rotary type and reciprocating type Most of the air compressors in the oxygen tank are of positive displacement type Rotary type: the piston makes rotary motion The piston is also called rotary dry The number of rotors is different, and the shape of cylinder is different Rotary type includes rotor type, screw type, slide type, etc Reciprocating: the piston moves back and forth, and the cylinder is cylindrical There are two types of reciprocating: piston type and membrane type, among which piston type is widely used in Zui Most of the air compressors used in oxygen tanks are piston type The classification, model representation, structural features and working principle of piston air compressor are introduced as follows: Mute oil-free air compressor produced by Aite in Ruian City belongs to micro reciprocating piston compressor, and its working principle is: motor single shaft drive compressor When the crankshaft rotates, through the transmission of the connecting rod, the piston with self lubrication without any lubricant will do reciprocating motion, and the working volume composed of the inner wall of the cylinder, the cylinder head and the top surface of the piston will change periodically When the piston of the piston compressor starts to move from the cylinder head, the working volume in the cylinder increases gradually At this time, the gas pushes the intake valve along the intake pipe and enters the cylinder, until the working volume changes to Zui, the intake valve is closed; the piston compressor When the piston moves reversely, the working volume in the cylinder shrinks and the gas pressure rises When the pressure in the cylinder reaches and is slightly higher than the exhaust pressure, the exhaust valve opens and the gas exhausts the cylinder until the piston moves to the limit position, and the exhaust valve closes When the piston of the piston compressor moves reversely again, the above process is repeated That is, the crankshaft of the piston compressor rotates once, the piston reciprocates once, and the process of air intake, compression and exhaust is successively realized in the cylinder, that is to say, a working cycle is completed The structure design of single shaft and double cylinder makes the gas flow of compressor double that of single cylinder when the rated speed is fixed, and the vibration and noise control is well controlled Piston air compressor is generally classified by exhaust pressure, exhaust volume (volume flow), structural type and structural characteristics 1 According to the exhaust pressure, it can be divided into: exhaust pressure of low-pressure air compressor ≤ 1.0MPa, medium pressure air compressor 1.0MPa < exhaust pressure ≤ 10MPa, high-pressure air compressor 10MPa < exhaust pressure ≤ 100MPa, 2 The connected exhaust volume can be divided into: small air compressor 1m3 / min < exhaust volume ≤ 10m3 / min, medium air compressor 10m3 / min < exhaust volume ≤ 100m3 / min, large air compressor The discharge capacity of air compressor with discharge capacity > 100m3 / min refers to the flow of free gas in suction state General provisions: the micro air compressor with shaft power less than 15kw and exhaust pressure less than or equal to 1.4mpa 3 According to the relative position between the cylinder center line and the ground, it can be divided into: vertical air compressor - the cylinder center line is arranged vertically with the ground Angle type 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 one side of the crankshaft Opposite dynamic balance 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, it can be divided into: single action - the gas is compressed only on one side of the piston Double acting - the 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 heat sink, which is cooled by air Fixed air compressor unit is fixed on the foundation Mobile air compressor unit is placed on the mobile device for easy moving Lubrication with oil - refers to the lubrication with oil in the cylinder and the circulating lubrication of the lubricating oil of the moving mechanism Oil free lubrication - refers to that the cylinder is not lubricated with oil, and the piston and cylinder are dry running, but the transmission mechanism is lubricated by lubricating oil circulation No oil lubrication - no oil lubrication for the transmission mechanism in the cylinder In addition, it is also divided into cross head (small and medium-sized oil-free air compressor), cross head (V, W type low-pressure micro air compressor); single-stage compression, two-stage or multi-stage compression 3、 The main formula of standard important data of silent oil-free air compressor: volume specific energy: the energy consumed in unit volume of compressed air, and its value is calculated according to the following formula: q = n / Q (volume specific energy = power / exhaust volume) volume efficiency (inflation coefficient) η, and the calculation formula: η = q / (VN × n e), that is, volume efficiency = exhaust volume/（ For example: the product data of tp1100f of Ruian Aite mechanical and electrical company is as follows: the cylinder diameter of air compressor is 69mm Cylinder stroke: 22mm, rotational speed: 1400, volume: (0.069 / 2) ^ 2 π x0.022x1400 ≈ 230 L, power: 1.2kW, pressure: 0bar 7 bar 8 bar Exhaust volume 12.1 m 3 / h 7.3 m3 / h 6.9 m3 / h volumetric efficiency 0.88 0.53 0.50 volumetric specific energy 69.84 10.43 standard: volumetric efficiency (inflation coefficient) η of air compressor is greater than or equal to 50% (no working pressure), the volumetric efficiency is greater than or equal to 48% at the working pressure of 0.7MPa, and the volumetric efficiency is greater than or equal to 45% at the working pressure of 0.8MPa The volume specific energy of the air compressor is less than or equal to 10 (without working pressure) When the working pressure is 0.7MPa, the volume specific energy Q is less than or equal to 10.5, and the working pressure is 0.8MPa, the volume specific energy Q is less than or equal to 11 4、 Dew point temperature required by the air compressor in the laboratory: keep the moisture content in the air unchanged, so as to reduce the temperature When the moisture reaches saturation due to cooling, it is the dew point temperature Dew point temperature can also be used to indicate the amount of moisture content The higher the dew point temperature, the more moisture content in the air For example, the marking method of Aite dryer: inlet pressure 0.3-1.0mpa, inlet temperature ≤ 40 ℃ pressure loss ≤ 0.03mpa regeneration mode no heat regeneration dew point temperature - 40 ℃ The intake air contains liquid ≤ 0.1ppm adsorbent alumina, and the air passing amount of molecular sieve can select dew point Air cleanliness (particle): < 0.05 μ air dryness (moisture content) < 0.05 ppm working principle: the surrounding air is compressed to 8 bar / 120 psi During this compression, the air is heated In order to allow as much water vapor as possible to condense before entering the dryer, first pass the compressed air through a radiator device to make the temperature of the compressed air close to the ambient temperature Then, the air enters the solid particles contained in the 0.01 micron prefilter and combines with the liquid (water) inside the filter After removing the impurity particles and water like liquid in the air, the air is led into the adsorption dryer The dryer consists of a double absorption column filled with active bauxite Within two minutes of air entering, the compressed air flows upward When passing through the drying layer of one absorption column, the residual water in the air is adsorbed At the same time, a small part of the dry air flows downward and is discharged through another absorption column In this process, the air releases water, which makes the desiccant regenerate After the air is dried, it passes through another 0.01 micron filter, and the residual desiccant particles may be brought into the system by the air (Zui small particles can be seen by human flesh and eyes are about 50 microns) After Zui, completely dry and clean air flows into the air receiver coated with inner protective layer for storage Before the compressed gas enters the air receiver, the dryer has absorbed the water to ensure that the dew point of the compressed gas in the air receiver is at - 40 ℃ At - 23 ℃ pressure and dew point, microorganisms can not grow, and at - 30 ℃ dew point, there is no risk of tank rust The dryer / filter combination provided by Aite meets the requirements of EU (Medicine) for breathing air and other international standards for compressed air quality The air output is cleaner and fresher