Comparison between twin-screw compressor and single-screw compressor
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Comparison between twin-screw compressor and single-screw compressor 1 • Single-screw compressor in terms of force balance: The radial and axial gas forces borne by the screw can be automatically balanced, and the star gear teeth bear the gas force, which requires the star gear teeth to have sufficient strength and stiffness. Twin screw compressor: The screw rotor bears large radial and axial gas forces, which requires the screw to have sufficient strength and stiffness. 2. Manufacturing cost of single screw compressor: Ordinary bearings can be used as the screw and star wheel bearings, and the manufacturing cost is low. Twin screw compressor: Due to the relatively large load on the two screw rotors, bearings with higher precision are required and the manufacturing cost is high. 3. Reliability of single screw compressor: The star wheel of a single-screw compressor is a vulnerable part. In addition to having high requirements on the material of the star wheel, the star wheel also needs to be replaced regularly. Twin screw compressor: There are no wearing parts in the twin-screw compressor, and the trouble-free operating time can reach 40,000 to 80,000 hours. 4. In terms of efficiency, in the new machine state, the efficiency of single-screw compressors and twin-screw compressors are basically the same. As the operating time increases, the star wheel wear of the single-screw compressor will lead to a reduction in air volume and efficiency. 5. In terms of noise and vibration, the noise and vibration of single-screw compressors and twin-screw compressors are basically the same. 6. Single screw compressor in processing equipment: There is no mature special processing equipment, which leads to unstable product performance. Twin screw compressor: There are already mature screw milling machines and grinding machines to ensure stable product performance. 7. In terms of operation and maintenance, the daily operation and maintenance of single-screw compressors and twin-screw compressors are basically the same. 8. Applicability of single screw compressor: Suitable for applications with high exhaust pressure, such as high-pressure air compressors, refrigeration compressors and natural gas compressors. Twin screw compressor: Due to limitations in rotor stiffness and bearing load, twin-screw compressors can only be used in medium and low pressure ranges, such as power air compressors, refrigeration compressors and low-pressure natural gas compressors. The exhaust pressure generally cannot exceed 4.5MPa.
The annual energy saving of a 10m³ single-screw air compressor is: 72,000 degrees per year. The annual energy saving of a 20m³ air compressor is: 144,000 degrees per year. Therefore, single-screw compressors will become the mainstream of the compressor market and are a substitute for twin-screw compressors. Noise: The single-screw air compressor has good force balance, small vibration, and low noise, which is 10-20 decibels lower than the twin-screw air compressor. The single-screw compressor is a new product launched in recent years, and the displacement has been stable at the beginning. ； After one year, the exhaust volume decreases (the star wheels on both sides are non-metallic and wear and tear during long-term operation), and the exhaust temperature increases. Major manufacturers: Guangdong Zhengli, Shanghai Feihe, and Shanghai Inspur twin-screw compressors have mature technology, stable operation, and the displacement will not decrease for 4-5 years. To sum up, judging from the current technological development, twin-screw air compressors are not only technically advanced, but also fully mature in practical applications and have been widely used. Although the single-screw air compressor is unique in principle, it is still in the experimental process due to shortcomings in some decisive factors. Its products still need to be further improved and cannot be widely promoted and applied in the market as a mature product.
However, some units are accustomed to using single-screw machines and are now using twin-screw machines.
At present, the market share of twin-screw compressors is much higher than that of single-screw compressors.~
Must support, thank you for sharing
You mentioned earlier that single-screw compressors will become the mainstream in the market, and later you confirmed twin-screw compressors. It’s hard to choose.
Thanks for sharing, learn from* . :D