Compared with other types of compressors, screw compressors have unique characteristics and advantages in multiple aspects. The following is a comparison of common types of compressors such as screw compressors, piston compressors, centrifugal compressors, etc.:
1. Comparison between screw compressor and piston compressor
Structure:
Screw compressor: The structure is relatively simple, the number of components is small, and there are no vulnerable parts, so it operates reliably and has a long service life.
Piston compressor: complex structure, multiple vulnerable parts, requiring frequent maintenance.
Efficiency:
Screw compressor: It has high volumetric efficiency and energy conversion efficiency, especially able to maintain high efficiency under partial load.
Piston compressor: Due to friction between the piston, piston ring, and cylinder wall, as well as power loss in driving the lubricating oil pump, the mechanical efficiency is generally between 0.75 and 0.9.
Balance and vibration:
Screw compressor: With good power balance performance and no unbalanced inertia force, the machine can operate smoothly and at high speeds.
Piston compressor: Affected by the inertia force generated by reciprocating motion, the exhaust is discontinuous, the airflow pulsation is large, and the vibration during operation is large.
Adaptability:
Screw compressor: Strong adaptability, can adapt to harsh environments such as high temperature, high humidity, and high dust, and has relatively low requirements for gas cleanliness.
Piston compressor: Although it can also adapt to certain working conditions, its adaptability range is relatively narrow compared to others.
2. Comparison between screw compressor and centrifugal compressor
Exhaust volume:
Screw compressor: It can achieve stepless adjustment from 0% to 100% through slide valve adjustment and other methods, adapting to different load requirements.
Centrifugal compressor: large displacement, uniform exhaust, no pulse airflow, suitable for occasions requiring atmospheric volume.
Speed:
Screw compressor: The speed is moderate and can be adjusted as needed.
Centrifugal compressor: High speed, requiring corresponding cooling and lubrication measures.
maintain:
Screw compressor: The structure is relatively simple, the maintenance and upkeep workload is small, and the maintenance cycle is long.
Centrifugal compressor: Although it has fewer vulnerable parts, its high speed and complex structure result in relatively high maintenance costs.
Adaptability:
Screw compressor: suitable for compression needs in the medium and low pressure range, with an exhaust pressure generally not exceeding 3.0Mpa.
Centrifugal compressor: suitable for low, medium pressure, and high flow applications. With the development of technology, its application range is constantly expanding.
3. Comprehensive comparison
Efficiency and energy saving: Both screw compressors and centrifugal compressors have high performance in terms of efficiency. Screw compressors can maintain high efficiency under partial load, while centrifugal compressors perform well under atmospheric conditions. Both have good energy-saving characteristics.
Noise and vibration: Screw compressors have relatively low noise and vibration due to their compact structure and fewer moving parts. Although centrifugal compressors have high rotational speeds, their structural characteristics result in relatively low noise and vibration. In contrast, piston compressors have higher levels of noise and vibration.
Maintenance and upkeep: The structure of screw compressors is simple, and the maintenance and upkeep workload is relatively small. Although centrifugal compressors have complex structures, they have fewer vulnerable parts and relatively lower maintenance costs. Piston compressors require frequent maintenance due to their complex structure and numerous vulnerable parts.
Applicable scenarios: Screw compressors are suitable for applications that require stable airflow, low noise, and high efficiency, such as industrial, commercial, and mobile applications. Centrifugal compressors are suitable for situations with high air volume and low to medium pressure. Piston compressors, due to their strong adaptability, are widely used in various situations where compressed gases are required.
In summary, screw compressors, piston compressors, and centrifugal compressors each have their own advantages, disadvantages, and applicable scenarios. When choosing a compressor, it is necessary to consider the specific usage requirements, working environment, and economic conditions comprehensively.
In terms of price, the comparison between screw compressors and other types of compressors (such as piston compressors, centrifugal compressors, etc.) is as follows:
1. Overview of prices for screw compressors
The price of screw compressors varies depending on their power, brand, material, manufacturing process, and application scenarios. Generally speaking, the price of large and high-efficiency screw compressors is relatively high, while the price of small and low-power screw compressors is relatively low. The price range of screw compressors on the market is wide, ranging from thousands to hundreds of thousands of yuan.
2. Price comparison with piston compressors
Price range:
Screw compressor: The price range is roughly between several thousand to several hundred thousand yuan.
Piston compressors: The price range is also relatively wide, but in comparison, some models of piston compressors may have lower prices, especially small, low-power piston compressors. However, the price of large and high-performance piston compressors may also reach a higher level.
Price influencing factors:
Both are influenced by factors such as power, brand, and material. Screw compressors are often expensive due to their complex structure and high efficiency performance. Although piston compressors have a simple structure, some high-performance and large-sized piston compressors are also expensive.
3. Price comparison with centrifugal compressors
Price range:
Screw compressor: As mentioned above, the price range is wide.
Centrifugal compressors: usually priced higher because they are suitable for high volume, low to medium pressure applications, and have higher technical difficulty.
Reason for price difference:
Centrifugal compressors require higher rotational speeds and more complex structures to achieve efficient gas compression, which increases their manufacturing costs and prices. Although screw compressors also have high efficiency, their structure is relatively simple and the manufacturing cost is low.
4. Comprehensive comparison and conclusion
Price level: Overall, the price level of screw compressors is relatively moderate, neither too expensive nor too cheap. Piston compressors may be more competitive in price, especially for small, low-power models. Centrifugal compressors, on the other hand, are relatively expensive due to their high performance and atmospheric processing capacity.
Cost effectiveness: When choosing a compressor, in addition to price factors, it is also necessary to consider factors such as performance, efficiency, maintenance costs, and service life. Screw compressors usually have a high cost-effectiveness, which can reduce maintenance costs and service life while ensuring performance. Piston compressors also have good cost-effectiveness in certain specific application scenarios. Centrifugal compressors are suitable for applications that require extremely high performance and efficiency.
In summary, screw compressors, piston compressors, and centrifugal compressors each have their own characteristics in terms of price. When choosing a compressor, it is necessary to comprehensively consider the specific usage requirements, working environment, and economic conditions, and choose the product with the highest cost-effectiveness.
