Answer:
(1) Air Filter
The air filter adopts a dry paper filter design. Its primary function is to filter dust from the air, ensuring clean air intake for the compressor system.
(2) Intake Valve
The intake valve controls the loading, unloading, and pressure adjustment of the air compressor. It achieves these functions by opening and closing, regulating air flow into the compressor.
(3) Pressure Switch
The pressure switch operates based on air compressor pressure changes. It controls the intake valve solenoid valve to open/close the intake valve, further managing the motor. Two key pressure values are set:
Maximum Pressure: When reaching this value, the intake valve closes, and a shutdown delay signal is sent to the motor.
Minimum Pressure: When pressure drops to this value, the intake valve reopens or the motor restarts.
(4) Outlet Check Valve
After compressed air enters the gas tank from the compressor, the outlet check valve prevents reverse flow of compressed air back to the compressor when the compressor stops.
(5) Safety Valve
The safety valve serves as a protective mechanism. If the pressure switch malfunctions or is improperly adjusted, and the pressure in the oil-gas tank exceeds the rated pressure by 0.1MPa, the safety valve opens to safeguard the air compressor unit.
(6) Pressure Maintaining Valve (Minimum Pressure Valve)
Located at the outlet of the oil fine separator above the oil-gas tank (with an opening pressure set at ~0.45MPa), the pressure maintaining valve has two key functions:
1)Lubrication Pressure Establishment: During startup, it prioritizes building the circulation pressure for lubricating oil, ensuring machine body lubrication. When the machine is unloaded, it maintains sufficient pressure to prevent oil circulation interruption by blocking pressure leakage.
2)Separator Protection: During machine loading, it prevents damage to the oil-gas separator core. By opening when pressure exceeds 0.45MPa, it reduces air flow rate through the oil fine separator, avoiding damage from large pressure differences.
Structure diagram: Refer to Figure 3-3.
(7) Rear Cooler
The rear cooler lowers the outlet temperature of compressed air through air cooling or water cooling. This ensures safe use of compressed air and meets the performance requirements of post-processing equipment.
(8) Discharge Solenoid Valve
When the air compressor shuts down or idles, the discharge valve opens to release pressure in the oil-gas tank. This ensures the compressor can restart or operate under no-load conditions. Common types include two normally open solenoid valves or piston-type discharge valves.
(9) Air Tank
The air tank acts as a storage container for compressed air and discharged gas from the compressor. It stabilizes exhaust pipeline pulses, stores compressed air, and supplements supply when demand exceeds the compressor’s capacity. Larger tank volume extends the compressor’s operation time interval.
(10) Water-Gas Separator
This device collects and removes condensed water precipitated from air or gas during the cooling process.
(11) Automatic Drainer
It automatically drains condensed water in the gas tank, eliminating the need for manual operation.
System flow chart for 15~37kW screw air compressors: Refer to Figure 3-4.
Figure 3-4 15~37kW screw air compressor system flow chart
