Oil-free air compressor is a miniature reciprocating piston compressor. When the compressor crankshaft is driven by a single shaft of the motor, the self-lubricating piston without any lubricant reciprocates through the transmission of the connecting rod, and the working volume formed by 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 gradually increases. At this time, the gas pushes the intake valve into the cylinder along the intake pipe until the working volume reaches the maximum and the intake valve closes. When the piston of the piston compressor moves in the opposite 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 is exhausted from the cylinder until the piston moves to the limit position and the exhaust valve closes. When the piston of the piston compressor moves in the opposite direction again, the above process is repeated.
That is, the crankshaft of the piston compressor rotates once, the piston reciprocates once, and the processes of air intake, compression and exhaust are successively realized in the cylinder, that is, a working cycle is completed. The structure design of single shaft and double cylinders makes the gas flow rate of the compressor double that of the single cylinder at a certain rated speed, and the vibration and noise control are well controlled.
Working principle of the whole machine:
When the motor is running, air enters the compressor through the air filter, and the compressor compresses the air. Compressed gas enters the gas storage tank through the gas flow pipeline and opens the one-way valve. The pointer of the pressure gauge shows that it rises to 8 Bar. When it is greater than 8 Bar, the pressure switch will automatically close after sensing the pressure in the channel, the motor will stop working, and the electromagnetic valve will discharge the air pressure in the compressor head to 0. At this time, the air switch pressure declared that the gas pressure in the gas storage tank was still 8 Bar, and the gas was discharged through the ball valve to drive the connected equipment to work. When the air pressure in the air storage tank drops to 5 Bar, the pressure switch is automatically turned on by induction, and the compressor starts to work again.
Oil-free air compressor is the main part of air source device, which combines the prime mover (usually motor).
The device for converting mechanical energy into gas pressure energy is a pressure generating device for compressed air.
Definition of oil-free air compressor
Fu Sheng Small Oil-free air compressor (English: oil-free air compressor) is the main body of the air source device, which is a device that converts the mechanical energy of the prime mover (usually a motor) into gas pressure energy, and is a pressure generating device for compressed air.
Standard for industrial requirements of silent oil-free air compressors for laboratory use
Most laboratories are high-precision instruments, which have the characteristics of continuous and stable work, simple operation, safe use, environmental protection and energy saving. At the same time, in order to create a good working environment for laboratory staff, especially the requirements for noise control are very high; Therefore, the air compressor that provides air source for experimental equipment is very different from the general industrial air compressor. Technicians have been engaged in theoretical research on laboratory air compressors for many years, and now some suggestions on how to correctly select laboratory air compressors are put forward for your reference.
1, parameter matching working air pressure control
That is, what is the air pressure required for work? Most of the air compressors used in the laboratory have adjustable air pressure of 0-8 bar (about 0-8 kg), which meets the air pressure requirements of most experimental equipment. Stable continuous displacement (usually expressed in L/MIN): refers to the number of liters of gas flow per minute under rated working pressure, which needs to ensure the continuous stability of gas flow, so the working stability of air compressor is highly required. There are many brands in the market, and the good and the bad are mixed. When choosing, we should consider the products of well-known brand manufacturers with mature technology, such as SWT series oil-free screw air compressor of Fu Sheng Company.
2, compressed air quality oil-free air compressor is the first choice.
The material of the oil-free air compressor itself does not contain oily substances, and there is no need to add any lubricating oil when working, so the discharged air quality is greatly improved, the safety of supporting equipment required by users is also guaranteed, and the pollution of the oil machine to the terminal equipment is avoided. Therefore, it is very necessary to choose a silent oil-free air compressor in the laboratory to ensure air quality. After installing the air filtration device, the air quality should reach the following international standard values. Oil-free and waterless silent air compressor, adsorption dryer and precision filtration system are designed as a whole, with self-contained drainage function and dew point of -40℃. The machine is compact in structure, novel and beautiful in appearance, stable in performance, large in gas production, stable in operation, low in noise and temperature, and saves energy by 0.2- 1kw/h compared with similar products.