(1) The role of the air filter of the low-pressure screw air compressor. The air filter is a thousand-type paper filter whose main function is to filter dust in the air.
(2) The function of the intake valve of the low-pressure screw air compressor. Through the opening and closing of the intake valve, the loading, unloading and pressure adjustment of the low-pressure screw air compressor are realized.
(3) The function of the pressure switch. Rely on the pressure change of the low-pressure screw air compressor to control the suction of the intake valve electromagnetic valve to control the opening and closing of the intake valve, and further control the motor. It can be set to a maximum pressure value, the intake valve closes when this pressure value is reached, and a stop delay signal is sent to the motor, and another minimum pressure value can be set at the same time, the intake valve is opened or the motor is restarted when the pressure value drops to this value .
(4) The role of the outlet check valve. After the compressed air enters the air tank from the compressor, when the low-pressure screw air compressor stops, the compressed air is prevented from flowing in the opposite direction to the low-pressure screw air compressor.
(5) The function of the safety valve. When the pressure switch is improperly adjusted or fails to cause the pressure in the oil and gas barrel to be 0.1MPa higher than the rated pressure, the safety valve will open to protect the safety of the low-pressure screw air compressor unit.
(6) The role of the pressure maintenance valve (minimum pressure valve). It is located at the outlet of the oil-fine separator above the oil-gas barrel, and the opening pressure is set at about 0.45MPa.
The function of the pressure maintenance valve is:
1) Prioritize the establishment of the circulating pressure required by the lubricating oil during start-up to ensure the lubrication of the machine body. Machine oil lubrication is carried out by the pressure difference of the machine itself, without additional oil pump assistance, when the machine is in the no-load state, a certain pressure is still required to maintain oil circulation, so the intake valve is relatively closed, and the minimum pressure valve prevents pressure leakage, so Ensure oil circulation.
2) When the machine is loading at the moment, if the pressure maintenance valve is not installed, the large pressure difference generated before and after the separation inside the oil and gas barrel will all be added to the separator, causing damage to the separator core; therefore, the first pressure maintenance valve The second function is to open after the pressure exceeds 0.45MPa, which can reduce the air flow rate flowing through the oil-fine separator and protect the oil-fine separator from being damaged due to excessive pressure difference.
3) The role of the rear cooler. Reduce the outlet temperature of compressed air by cooling to ensure the safe use of compressed air and meet the performance requirements of air post-processing equipment. There are two cooling methods: air cooling and water cooling.
4) The role of the discharge solenoid valve. When the low-pressure screw air compressor is stopped or empty, the relief valve is opened to discharge the pressure in the oil and gas barrel, so as to ensure that the low-pressure screw air compressor can start or run without load when it runs again. Commonly used relief valves are two normally open solenoid valves or piston relief valves.
5) The role of the gas storage tank. The air storage tank is a container for storing compressed air and gas discharged from a low-pressure energy-saving air compressor. The air storage tank is beneficial to eliminate the pulse in the exhaust pipeline, and when the demand is greater than the capacity of the compressor, it can store and supplement the supply of compressed air. The longer the time interval.
6) The role of water and gas separator. A water separator is a device used to collect and remove the condensed water that precipitates from the air or gas during the cooling process.
7) The function of the automatic drain. Drain the moisture accumulated in the gas storage tank without manual operation.
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