Introduction to the Quality Inspection Process of Screw Air Compressors
I. Pre - production Inspection
1 Component Inspection
Before the production of screw air compressors begins, all incoming components are strictly inspected. This includes checking the dimensions of screw rotors, bearings, and cylinder bodies using precision measuring instruments such as calipers and micrometers to ensure they meet the design requirements. For example, the tolerance of the screw rotor diameter should be within a very small range to guarantee smooth meshing and efficient compression.
2 Material Quality Verification
The quality of materials used in components is also verified. Samples of metal materials are taken for material composition analysis through spectroscopy or other advanced testing methods. High - strength and corrosion - resistant materials are required for key components like the compressor housing to ensure long - term reliable operation.
II. In - process Inspection
1 Assembly Quality Control
During the assembly process, inspectors check the alignment and tightness of each part. For instance, when assembling the bearing, the interference fit between the bearing and the shaft is carefully measured to ensure proper installation. Any misalignment or improper tightness can lead to abnormal vibration and premature failure of the compressor.
2 Lubrication and Sealing Inspection
The installation and quality of the lubrication system and seals are inspected. The oil pipelines should be free of blockages, and the seals should be properly installed to prevent oil leakage and air leakage. Pressure - testing equipment is used to check the sealing performance of the compressor housing to ensure that the internal pressure can be maintained during operation.
III. Final Inspection
1 Performance Testing
After assembly, the screw air compressor undergoes a series of performance tests. The most important one is the air compression performance test. The compressor is run under rated conditions, and parameters such as air flow rate, discharge pressure, and power consumption are measured. The measured air flow rate and discharge pressure should reach the values specified in the product standard. For example, for a certain model of screw air compressor, the rated air flow rate at a specific discharge pressure should be accurately achieved.
2 Noise and Vibration Detection
Noise and vibration levels are also important indicators. Specialized noise - measuring instruments and vibration sensors are used to measure these values. The noise level should be within the allowable range to ensure a comfortable working environment, and the vibration should be minimized to guarantee the stability and service life of the equipment.
3 Appearance and Packaging Inspection
Finally, the appearance of the compressor is inspected for any scratches, dents, or paint defects. The packaging is also checked to ensure that it can protect the compressor during transportation and storage.
