The equipment has requirements on the air pressure of the plant, mainly involving cleanliness control, equipment performance assurance, production process requirements and safety specification four core reasons, the following combination of examples for your detailed analysis:
1. cleanliness control: to prevent external pollution
in electronic chip manufacturing, biomedicine, semiconductor production and other high-precision industries:
- positive pressure environment: Plant domestic demand to maintain 5-10 Pa higher than the external pressure, to prevent dust, microbial invasion. For example, clean rooms filter air through the air supply system to maintain a positive pressure difference and ensure product quality.
- Negative pressure special scene: If the laboratory handling toxic substances, it is necessary to maintain negative pressure (5-20 Pa below the outside) to prevent harmful gas leakage.
2. equipment performance guarantee: air pressure affects operating efficiency
- thermal and electrical performance
- low pressure risk in high altitude areas, the air pressure is low, the air is thin, the heat dissipation efficiency of the equipment is reduced, and the electrical insulation performance is reduced (such as the insulation medium of transformers and circuit breakers is affected).
- Examples: For every 1000 meters above sea level, the power of the internal combustion engine decreases by about 9%-13%, and the fuel consumption increases by 6%.
- Mechanical accuracy and stability
- precision processing equipment: Air pressure fluctuations exceeding ± 2 Pa may cause a decrease in processing accuracy and an increase in product failure rates.
3. production process requirements: air pressure directly affects quality
- spraying process
- air pressure and paint film quality: Air pressure fluctuations will cause uneven atomization of the paint, affecting the thickness and color of the coating. For example, if the air pressure is too high (>0.7MPa), the paint film will be too thin and the color will be too light. If the air pressure is too low, the paint will be poorly atomized.
- Welding process
- stud welding machine: Air pressure instability is easy to produce pores, cracks and other defects. It is necessary to monitor the air pressure in real time and control it within the range of process requirements (usually ± 0.5MPa).
4. Safety Specification: Explosion Protection and Personnel Health
- explosion-proof safety
- dust explosion risk in the dust environment of grain processing and chemical industry, it is necessary to control the air pressure to prevent dust from rising, and at the same time avoid sparks caused by the fluctuation of air pressure.
- Personnel comfort
- air pressure and somatosensory too low air pressure may cause hypoxia and dizziness; too high air pressure may increase the burden on the body. For example, plants in plateau areas need to be equipped with oxygen supply equipment.
5. solution: How to manage plant air pressure
- zoning Control
- different regional differences: The air pressure in the production area is 3-5 Pa higher than that in the storage area to avoid dust diffusion.
- Equipment selection
- air compressor and pressure regulating valve: Select variable frequency air compressor and cooperate with precision pressure regulating valve to ensure that the air pressure is stable at the set value (e. g. ± 0.5%).
- monitoring system
- real-time sensor: Deploy air pressure sensor, linkage alarm system, once found abnormal immediately.
- Regular maintenance
- check tightness: The aging of doors, windows and pipe sealing strips will cause air pressure leakage and need to be replaced regularly.
Summary workshop air pressure management is a systematic project, which needs to be designed comprehensively in combination with industry characteristics, equipment requirements and safety specifications. Through precise control of air pressure, not only can improve product quality, but also extend the life of equipment and ensure personnel safety.
