The division of frequency conversion and fixed frequency of screw compressor
the screw compressor itself is a type of compressed gas equipment, and its driving mode can be divided frequency conversion and fixed frequency two, the core difference is motor speed control and energy consumption management:
1. Fixed frequency screw compressor
- working principle: The motor runs at a fixed speed, and the start and stop are controlled by the pressure switch (if the pressure reaches the upper limit, the lower limit is started).
- Features:
- the structure is simple and the initial cost is low.
- Frequent start and stop will easily lead to high energy consumption and air pressure fluctuation (± 0.1~0.2 MPa).
- It is suitable for scenes with stable gas consumption and small load changes (such as small cars and simple pneumatic tools).
2. Inverter screw compressor
- working principle the motor speed is adjusted in real time by the frequency converter, the gas demand is dynamically matched, and the pressure fluctuation is controlled within ± 0.01 MPa.
- Features:
- energy saving: Air supply on demand, 30%-50% energy saving than fixed frequency machine (especially suitable for fluctuating load).
- Stable: Constant air pressure to protect precision equipment (such as pneumatic sensors, medical instruments).
- Long life: Soft start reduces mechanical impact and prolongs the life of bearings, screws and other components.
- Low noise: When the speed is reduced, the operation is quieter, suitable for hospitals, laboratories and other scenes.
How to choose?
- Selected frequency conversion: If the gas consumption fluctuates greatly (e. g. automatic production line, pharmaceutical filling), energy saving or mute is required.
- Selected frequency: If the gas consumption is stable (e. g. small repair shop) and the budget is limited.
Summary
screw compressors have both fixed frequency and frequency conversion models. Frequency conversion technology significantly optimizes energy efficiency and stability by dynamically adjusting the speed. It is the mainstream choice for industrial energy-saving upgrades. The specific need to combine load characteristics, budget and pressure requirements of comprehensive decision-making.
