Which is better, scroll compressor or screw compressor?

Scroll compressors and screw compressors each have their own unique advantages and application scenarios. Which is better needs to be judged according to actual needs and working conditions. The following is a detailed comparison of the two compressors:

1. working principle

• screw compressor: A pair of spiral tooth rotors in the cylinder mesh with each other, causing the change of the primitive volume composed of the tooth space to realize the compression of the gas.
• Scroll Compressor: It is composed of two scrolls. Through the rotation of the movable scroll, the crescent-shaped volume between the movable scroll and the fixed scroll is changed to realize the compression of the gas.

Comparison of 2. advantages

advantages of screw compressor

1. high reliability: The number of parts is relatively small, there are no wearing parts, reliable operation and long service life.
2. strong adaptability: It has the characteristics of forced gas transmission, the volume flow is almost not affected by the exhaust pressure, and it can maintain high efficiency in a wide working range.
3. Easy operation and maintenance: High degree of automation, relatively simple and compact structure, easy maintenance.
4. Good dynamic balance: No unbalanced inertial force, smooth operation, low noise and vibration level.
5. Energy saving and environmental protection with the development of technology, screw compressors have made significant progress in energy saving and environmental protection, such as oil-free screw air compressors using water lubrication technology.

Scroll Compressor Advantages

1. simple and compact structure: No reciprocating mechanism, light weight, small number of parts, low manufacturing and maintenance costs.
2. Low vibration noise: Small torque change, high balance, stable operation, relatively low vibration and noise level.
3. High efficiency and energy saving: It has high volumetric efficiency in medium and low temperature applications and can significantly save energy.
4. high reliability although the small number of parts is not its main advantage, the scroll compressor also shows high reliability.

Comparison of 3. weaknesses

disadvantages of screw compressor

1. higher price: Due to the processing accuracy and complexity, the price of screw compressors is usually higher.
2. loud noise: Although the power balance is good, the noise level is still high compared to the scroll compressor.
3. Can not be used in high pressure situations: Limited by rotor stiffness and bearing life, the general exhaust pressure does not exceed 3MPa.

Scroll Compressor Disadvantages

1. high accuracy requirements: The processing accuracy of the scroll plate needs to reach the micron level, which increases the manufacturing cost.
2. No exhaust valve, poor performance under variable working conditions: May perform poorly in some applications with large changes in operating conditions.
3. Difficult to achieve large displacement: Limited by the tooth height, the large displacement scroll compressor is difficult to realize, and the machine is not compact and the weight increases.

4. Application Scenarios

• screw compressor: It is more suitable for occasions that require long-term continuous operation and high efficiency requirements, such as refrigeration, HVAC and chemical processes.
• Scroll Compressor: Excellent performance in medium and low temperature applications, such as air conditioning (heat pump), heat pump hot water, small refrigeration equipment, etc.

To sum up, the scroll compressor and the screw compressor have their own advantages. The choice of which compressor should be considered according to the actual demand and working conditions. After a comprehensive evaluation of reliability, efficiency, noise, and cost, you can determine which compressor is more suitable for your application.