Complete solution of parameters for 15kW Roots blower**
**Deep interpretation from nameplate data to performance curve**
**1. Core parameter table**
|Parameter Name | Typical Value Range | Test Standard|
|----------------|------------------|-----------------|
|Rated flow | 18-28 m3/min | GB/T 8947|
|Boosting capacity | 9.8~78.4 kPa | ISO 5389|
|Noise level | 85~92 dB (A) | GB/T 2888|
|Shaft power | 13.2~14.7 kW | IEC 60034-30|
|Whole machine weight | 450~680 kg | -|
**2. Performance curve analysis**
-Flow pressure curve: approximately linear in the range of 0-50kPa, with a slope of about 0.3 m3/min/kPa;
-Efficiency curve: The efficiency point usually occurs in the range of 60-80 rated flow;
-NPSHr curve: The necessary cavitation allowance increases exponentially with the increase of rotational speed.
**3. Selection verification process**
1. * * Thermal calculation * *: Verify whether the temperature rise of the motor meets the insulation level (commonly Class B: 130 ℃);
2. * * Torque verification * *: The shear stress of the transmission shaft should be less than the allowable value of the material (120 MPa for 45 steel);
3. * * Critical speed * *: The working speed should avoid the 70-130 range of the first-order critical speed.
