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Introduction of air flow and main accessories of air compressor
Classification: Technical Data
Classification: Principles of Engineering
Classification: Compressor Guide
Classification: Service process
Time：2017-09-27 09:12
First of all, the main air source in the air flow path of the air compressor parts function brief description: 1. oil and gas barrel oil and gas barrel oil and gas separation and oil storage two functions. The compressed oil and gas mixture is discharged to the oil and gas barrel, and most of the lubricating oil can be separated by rotating in the oil and gas barrel; the oil and gas barrel has more lubricating oil to prevent the hot oil just separated from immediately participating in the next cycle, which is beneficial to reduce Exhaust temperature. Oil level indicator is installed on the side of oil and gas barrel. There is a refueling hole on the barrel for refueling. The oil level of static lubricating oil should be between the upper limit and the lower limit of the oil level gauge. Oil (water) ball valve is installed under the oil and gas barrel, which should be used every time
First of all, a brief description of the air compressor accessories function on the main air source path in the air flow:
1. oil and gas drum
Oil and gas barrel has two functions of oil and gas separation and oil storage. The compressed oil and gas mixture is discharged to the oil and gas barrel, and most of the lubricating oil can be separated by rotating in the oil and gas barrel; the oil and gas barrel has more lubricating oil to prevent the hot oil just separated from immediately participating in the next cycle, which is beneficial to reduce Exhaust temperature. Oil level indicator is installed on the side of oil and gas barrel. There is a refueling hole on the barrel for refueling. The oil level of static lubricating oil should be between the upper limit and the lower limit of the oil level gauge. The oil (water) ball valve is installed under the oil and gas barrel. The ball valve should be slightly opened before each operation to drain the condensed water in the oil and gas barrel (because the water is heavier than the oil, it settles in the lower part). Once there is oil outflow, quickly shut down. Due to the wide cross-sectional area of the oil and gas barrel, the compressed air flow rate can be reduced, which is conducive to the separation of oil droplets and plays the role of preliminary oil removal.
2. air filter
The air filter is a dry paper filter with a fine pore size of about 5 μm. Its main function is to filter out dust in the air to 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 clear the surface of the dust. The method of removal is to use low-pressure air to blow the dust from the inside out.
3. oil-gas separator
The oil and gas separator filter element is made of multi-layer fine special fibers. The mist lubricating oil contained in the compressed air can be almost completely filtered out after passing through the oil fine separator. The oil particle size can be controlled below 0.1μm, and the oil content can be less than 3PPM.
4. intake valve
The intake valve is a disc-type intake valve, which is mainly controlled by opening and closing the disc in the intake valve to carry out empty and heavy load control; there are two control methods, one is on-off type, when the pressure reaches the high limit set value, Close the air inlet, the pressure drops to the low limit set value, and reopen the air inlet to work at full load. Another kind of capacity adjustment control, the disc of the intake valve is slightly closed and the proportional valve is used for capacity adjustment control to adapt to the external air consumption, so that the pressure is stable within a certain range, the pressure does not reach the capacity adjustment pressure, and the disc of the intake valve is fully open, At this time, the compressor is running at full load.
5. safety valve
When the gas pressure in the oil and gas barrel is 1.1 times higher than the rated exhaust pressure, the safety valve will automatically take off and relieve the pressure, so that the pressure drops below the rated exhaust pressure.
Check the safety valve method is in the compressor full load work, gently pull the safety valve on the vent rod, if the safety valve can exhaust, it is considered normal.
6. aftercooler
The compressed air from the minimum pressure valve is passed to the aftercooler. The after-cooler and the oil cooler are made into one body, and their structures are the same, and they are all plate-type. The cooling fan draws cool air in and over the after-cooler rocker. The temperature of the cooled compressed air is generally below the ambient temperature of 15°C.
7. minimum pressure valve
Located at the outlet of the fine oil separator above the oil and gas poke, the opening pressure is set to about 0.45MPa. The minimum pressure valve mainly has the following functions:
1. The oil and gas barrel is opened after the gas pressure exceeds 0.4MPa, which can reduce the air flow rate flowing through the oil fine separator. In addition to ensuring the oil fine separation effect, it can also protect the oil fine separator from damage due to too large pressure difference.
2. When starting, the circulating pressure required for lubricating oil is established first to ensure the lubrication of the machine.
3. Return function: when the pressure in the oil and gas barrel drops after shutdown, it prevents the pipeline compressed air from flowing back.
air flow of air compressor:
Generally speaking, in the air process of a screw air compressor, after the air is filtered out by the air filter, it enters the main compression chamber through the intake valve for compression and is mixed with lubricating oil. The compressed air mixed with oil is discharged to the oil and gas barrel, and then sent to the service system through the oil fine separator, pressure maintenance valve and after-cooler.