The normal range and key points of use for the outlet pressure of Roots blower are as follows:
1、 Standard pressure range (universal type)
1. * * Regular work pressure * *:
-Efficiency range: 39.2~78.4 kPa (0.4~0.8 bar)
-Sustainable operating limit: 98 kPa (1.0 bar)
2. * * Instantaneous allowable peak value * *:
-Short term (<30 minutes) can withstand: 110 rated pressure
-Valve popping pressure: usually set at 110-120% of the rated pressure
2、 Pressure corresponding to different specifications
|Fan model | Rated pressure (kPa) | Applicable scenarios|
|---------|--------------|---------|
|-50 | 49 | Small scale aeration and pneumatic conveying|
|-100 | 78.4 | Medium sized sewage treatment|
|-150 | 98 | Deep water aeration and vacuum system|
3、 Criteria for judging abnormal pressure
1. * * Low pressure * * (below the design value of 80):
-Possible reasons: impeller wear (clearance>0.5mm), pipeline leakage, inlet blockage
-Performance: Insufficient air volume, decreased motor current
2. * * Pressure too high * * (exceeding the rated value):
-Possible reasons: Improper closure of outlet valve, pipeline blockage, and selection of small size
-Performance: Motor overload (current exceeding 10), abnormal noise and vibration
4、 Pressure regulation specifications
1. * * Strictly prohibit operation * *:
-Control pressure through outlet valve throttling (which may cause overpressure damage)
2. * * Correct adjustment method * *:
-Variable frequency speed regulation: For every 10 RPM reduction, the pressure decreases by approximately 15
-Bypass reflux: Install a reflux valve to maintain a flow rate of 20
5、 Special medium pressure correction
1. Corrosive gas: pressure upper limit reduced by 15-20
2. High temperature gas (>80 ℃): For every 50 ℃ increase, the pressure limit decreases by 5
3. Dust medium: An additional margin of 9.8~19.6 kPa is required
6、 Maintenance and monitoring requirements
1. Daily check:
-Pressure indication fluctuation (normal should be ≤± 5)
-Integrity of valve lead seal
2. Monthly testing:
-Manually pull up the valve to verify the exhaust function
-Pressure sensor calibration (error<2)
It is recommended to install a buffer tank (with a volume ≥ 3 times the diameter of the pipe) on the outlet pipeline of the fan, which can effectively suppress pressure fluctuations. The actual operating pressure should be at a value that meets the system requirements. Long term overpressure operation will significantly shorten the gear life (for every 10 pressures exceeded, the life will be reduced by 30).
