The pressure range of the three blade Roots blower depends on its design specifications and application requirements, and can usually be divided into the following levels:
---
**1. Standard pressure range**
-Low pressure type: 9.8kPa~49kPa (0.1~0.5kgf/cm2)
-Suitable for low resistance scenarios such as aquaculture and small-scale pneumatic conveying.
-Medium pressure type: 49kPa~98kPa (0.5~1.0kgf/cm2)
-Commonly used in conditions such as sewage treatment aeration and vacuum packaging.
-High pressure type: 98kPa~196kPa (1.0~2.0kgf/cm2)
-Used for special industrial transportation (such as chemical and metallurgical industries), structural design needs to be strengthened.
---
**2. Key influencing factors of stress**
|* * Factor * * | * * Explanation * *|
|------------------|-------------------------------------------------------------------------|
|* * Rotor clearance * * | The smaller the clearance, the less leakage, and the higher the theoretical pressure upper limit (but the risk of wear needs to be balanced)|
|* * Rotational speed * * | Increasing rotational speed can increase air volume, but has limited effect on pressure increase (pressure is mainly determined by system resistance)|
|* * Sealing Performance * * | Mechanical seals are superior to ordinary seals and can reduce gas reflux under high pressure|
|* * Shell Strength * * | High voltage models require thicker shell materials (such as cast iron HT250 or stainless steel)|
---
**3. Selection precautions**
-The nameplate indicates that the rated pressure of the fan (such as 58.8kPa) is the allowable working pressure. Overpressure operation can cause:
-Motor overload and burnout
-Rotor deformation friction
-Shortened gear life
-* * System matching * *: The actual pressure is determined by the resistance of the backend pipeline and needs to be adjusted through valves or frequency conversion.
---
**4. Comparison of pressure with centrifugal fan**
|* * Fan type * * | * * Typical pressure range * * | * * Features * *|
|------------------|-----------------------|----------------------------------------|
|Three leaf Roots blower | 9.8-196kPa | Stable flow rate, pressure determined by system resistance|
|Centrifugal fan | ＜ 50kPa | Pressure varies with flow rate, narrow zone|
---
**5. Special high-voltage models (customized)**
-Double stage series Roots blower: With two-stage pressurization, the pressure can reach 200-300kPa (requires an intercooler).
-Mixed flow design: Combining Roots and centrifugal technology, the pressure can reach over 150kPa (such as some high-pressure aeration models).
---
**6. Common Application Stress Reference**
|* * Application Scenarios * * | * * Typical Pressure Requirements * * | * * Remarks * *|
|------------------|-----------------------|----------------------------------------|
|Wastewater treatment aeration | 58.8-68.6kPa | needs to overcome water depth resistance|
|Pneumatic conveying | 49-98kPa | Adjust according to the conveying distance and material|
|Vacuum packaging | -20~-50kPa (negative pressure) | requires reverse connection for use as a vacuum pump|
---
**Summary**
-Standard three blade Roots blower pressure: generally ≤ 98kPa (1.0kgf/cm2), high-pressure customized models can reach 196kPa (2.0kgf/cm2).
-Core principle of pressure selection: Calculate based on system resistance and reserve 10 margins to avoid overpressure operation.
If parameters are required, please provide details of the fan model or operating conditions (such as flow rate, gas medium, pipeline layout, etc.)!
