Vibration standards for scroll compressors

Detailed explanation of vibration standards for scroll compressors

As a precision mechanical equipment, scroll compressor’s vibration standard is crucial for the stable operation of the equipment. The following is an analysis from three aspects: principle, vibration standards and importance:

1. Basic principles of scroll compressor

The scroll compressor forms a series of closed crescent-shaped air chambers through the relative orbiting motion of the movable scroll and the fixed scroll. As the moving plate revolves, the volume of the gas chamber gradually shrinks, and the gas is compressed and discharged from the central exhaust port. Its core advantages are simple structure, small size, and low vibration, making it suitable for air conditioning, refrigeration and other fields.

2. Analysis of vibration standards

1. Vibration units and evaluation indicators
   Vibration usually occurs inamplitude（mm）、vibration velocity（mm/s）、vibration acceleration(mm/s²) means:

• amplitude: Represents vibration displacement and is suitable for evaluation of low-speed equipment.
• vibration velocity: Represents vibration energy and is suitable for medium-speed equipment.
• vibration acceleration: Represents impact force and is suitable for high-speed equipment.

2. Vibration standards for scroll compressors
   According to industry standards and practical applications:

• maximum amplitude limit: Under rated operating conditions, the maximum amplitude of key positions such as the exhaust pipe of the scroll compressor should not exceed200 microns。
• frequency range: Pay attention to the vibration characteristics of the compressor within the operating frequency (such as 25Hz~100Hz) to avoid resonance.

3. test method

• measuring point arrangement: Install acceleration sensors in key locations such as compressor bearings and exhaust pipes.
• analysis means: Evaluate vibration characteristics through modal analysis, harmonic response analysis and other methods, and optimize the support structure (such as adjusting the support position) to reduce vibration.

3. The importance of vibration standards

1. Equipment operating stability
   Excessive vibration may cause equipment resonance, causing fatigue damage to parts and reducing equipment life.

2. fault early warning
   Vibration signals can reflect internal faults (such as orbiting scroll wear, insufficient bearing lubrication) and provide a basis for preventive maintenance.

3. performance guarantee
   Vibration control directly affects the efficiency and reliability of the compressor and ensures the continuity and tightness of the gas compression process.

4. Optimization direction of vibration control

1. structural optimization

• Optimize the compressor structure through finite element analysis and improve dynamic balance.
• Use flexible support or damping materials to reduce vibration transmission.

2. process improvement

• Improve processing accuracy and ensure the mating clearance of the orbiting/stationary scroll.
• Strengthen quality control in the assembly process.

3. monitoring and maintenance

• Deploy an online vibration monitoring system to assess equipment status in real time.
• Regularly check the lubrication system, bearings and other wearing parts.

summary: The vibration standard of scroll compressors takes amplitude as the core indicator and combines comprehensive evaluation of speed and acceleration. Compliance with standards can significantly improve equipment stability and life, and vibration control needs to be achieved through design optimization, process control and intelligent monitoring.