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System Process of Air Compressor - Air Process
- May 18, 2018 -

System Process of Air Compressor - Air Process

After the air has been filtered out of the air filter, it enters the main compression chamber via the intake valve and is compressed and mixed with the lubricating oil. Compressed air mixed with oil is discharged to the oil and gas tank, and then sent to the use system through an oil separator, a pressure maintenance valve, and an after cooler.

1.Function description of each component on the main gas path

(1) air filter

The air filter is a dry paper filter and the pore size of the filter paper is about 5 μm. Its main function is to filter out the dust in the air, avoid premature wear of the screw rotor, premature blockage of the oil filter and the oil separator. Usually every 500 hours of work should be removed to remove the surface of dust. The method of removal is to use low-pressure air to blow dust from the inside out.

(2) intake valve

The intake valve is a disc-type intake valve, which mainly controls the empty load by opening and closing the disc in the intake valve; there are two control modes, a switch type, when the pressure reaches the high limit setting value. , Close the air inlet, pressure drop to the lower limit set value, reopen the air inlet to work at full load. Another kind of capacity control, the inlet valve disc micro-close with the proportional valve capacity adjustment control, to adapt to the external gas consumption, so that the pressure is stable within a certain range, the pressure does not reach the volume adjustment pressure, the disc of the intake valve On, the compressor is fully operational at this time.

(3)oil and gas barrels

Oil and gas barrels have two functions: oil and gas separation and oil storage. After the compressed oil and gas mixture is discharged to the oil and gas barrels, most of the lubricant oil can be separated by rotating in the oil and gas barrels; more oil is stored in the oil and gas barrels to prevent the immediately separated hot oil from immediately participating in the next cycle, which will help to reduce the number of rows. Gas temperature. There is an oil level indicator on the side of the oil and gas tank. There is a filling hole on the barrel for refueling. The oil level of the static lubricating oil should be between the upper limit and the lower limit of the oil level meter. Below the oil and gas tanks, oil (water) ball valves are installed. Before each operation, the ball valve should be opened slightly to exclude condensed water in the oil and gas tanks (because the water is heavier than oil and settles in the lower part). Once oil has flowed out, close it quickly. Due to the large cross-sectional area of the oil and gas barrels, the compressed air flow rate can be reduced, which is beneficial to the separation of oil droplets, and plays a role in the initial degreasing.

(4)oil separator

The fine separator filter element is made of multi-layered and fine special fibers. The mist of lubricating oil contained in the compressed air can be completely filtered out after the oil separator, and the oil particle size can be controlled below 0.1 μm. It can be less than 3PPM.

Here in the Bolett screw compressor, the oil separator is divided into internal oil and external oil. However, external oils are generally small models. Large models are generally internal oil.

(5)safety valve

Safety valve When the gas pressure in the oil and gas tank is 1.1 times higher than the rated exhaust pressure, the safety valve will automatically take off and pressure will be relieved to reduce the pressure to below the rated discharge pressure.

The method of checking the safety valve is to gently pull the bleed rod on the safety valve when the compressor is fully loaded. If the safety valve can be vented outwards, it is considered normal.

(6)minimum pressure valve

Located at the outlet of the oil separator above the oil-gas separator, the opening pressure is set to about 0.45 MPa. The minimum pressure valve mainly has the following functions:

a. Prior to start-up, the circulatory pressure needed to establish the lubricating oil is prioritized to ensure the lubrication of the machine.

b. When the gas pressure in the oil and gas drum exceeds 0.4 MPa, the flow rate will be reduced to reduce the air flow rate through the oil separator. In addition to ensuring the fine oil separation effect, the oil separator can be protected from too much pressure difference. damage.

c. Return function: When the pressure in the oil and gas tank drops after shutdown, prevent the pipeline from returning compressed air.

(6)after cooler

Compressed air from the smallest pressure valve leads to the aftercooler. The aftercooler is made in one piece with the oil cooler, and its structure is the same. The cooling fan draws cold air through the rear cooler rocker. The cooled compressed air temperature is generally below ambient temperature +15°C.