Scope of application
|
The widest scope of application. |
The large scope of application, generally used in high-pressure fields. |
Construction
|
The two rotors continue to operate, changing the cavity volume to shrink. |
The crankshaft drives the piston to reciprocate to rest. It transforms the cylinder volume to contract. |
System configuration
|
Air compressor + air storage tank + primary oil filter + air dryer + secondary oil filter |
Air compressor + after cooler + low temperature type air dryer + three-stage oil filter + air storage tank + cooling tower + water pump + dry road valve |
The balance of forces
|
Good, There is no unbalanced inertial force difference. |
Not good. As the crankshaft rotates, the piston changes greatly. Generate a lot of inertial force. |
The vibration and noise
|
Small, and no foundation is required. |
Large, generally require a foundation in addition to microcomputers. |
Air pulsation and pipe vibration
|
Small |
Large |
Cooling methods
|
air-cooled, water-cooled; air-cooled is recommended, no additional investment. The heat exchanger cleaning only uses contraction gas blowing. |
Most big models are cold water, which requires an additional cooling system, such as a cooling tower, water pump, and valve. Increased the level of complexity of the system, there is a possibility of water leakage. It is inconvenient to clean the water-cooled heat exchanger. |
Efficiency and energy consumption
|
High efficiency. Energy consumption is reduced by 15%-25%. |
Low speed, low efficiency, and high energy consumption. |
Volume and weight
|
Small size and lightweight, saving raw materials. |
The large size and heavyweight. |
Operation and maintenance
|
High degree of automation, simple and convenient operation and maintenance. |
Low degree of automation, many spare parts, complicated operation, and maintenance. |
Drive mode
|
Direct drive and belt drive |
Most are belt drive |
Compressed air quality
|
Low exhaust temperature, low oil content, and low quality of impurities. |
The exhaust temperature is high, and the oil content and impurities are high. |
Reliability and longevity
|
High reliability and long life. The life of the main engine can generally reach more than 60,000 hours. Lubricating oil: 4000 hours; Intake filter: 4000 hours. |
High failure rate and short life.
Lubricating oil: 2000 hours; intake filter: 2000 hours. |
Repairability
|
Generally, no repair is required. When maintenance is required, the maintenance personnel are required to be not very high. |
The wearing parts are updated frequently and the maintenance workload is heavy. But the maintenance is less difficult. |