How much pressure can a Roots blower handle? Detailed explanation of design limits and working condition matching**
**Keywords core: pressure generation principle, rated value vs actual value, overload risk
**1、 The mechanism of pressure generation**
The Roots blower generates pressure by squeezing air through the impeller, but the characteristic of no internal compression leads to:
-Pressure is limited by:
-Shell strength (usually<200kPa)
-Motor torque (sudden increase in current during overpressure)
**2、 Industry standard pressure range**
-Low pressure type: 9.8~49kPa (sewage treatment aeration)
-Medium pressure type: 49~98kPa (pneumatic conveying)
-High pressure type: 98~196kPa (special industrial scenario)
**3、 The hazards and protection of overpressure**
1. * * Mechanical damage * *: Bearing overload, impeller friction shell.
2. Motor burnout: If the current exceeds the rated value of 150 for 10 minutes, it may be damaged.
3. * * Solution * *:
-Install valve (set to 1.1 times rated pressure)
-Pressure sensor linkage shutdown protection
**Case * *: Due to pipeline blockage, the back pressure of a chemical plant increased to 120kPa (rated 80kPa), and the valve was released to prevent equipment damage.
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**3. What is the pressure of the Roots blower? Breaking through the limits of technology and risks**
**Keywords core: material innovation, structural optimization, working conditions
**1、 Design upper limit of traditional models**
-Cast iron shell: limit of approximately 196kPa
-Cast steel shell: up to 245kPa (requires strengthened bearing support)
**2、 Technical means to increase stress**
1. Three bladed rotor design: reduces leakage by 20 and increases pressure by 15 compared to a two bladed rotor.
2. * * Water cooled shell * *: Reduce thermal expansion deformation and maintain gap accuracy under high pressure.
**3、 High voltage application scenarios**
-Petrochemical industry: The hydrogen recovery system requires a continuous pressure of 180kPa.
-* * Vacuum field * *: As a front-end vacuum pump, the maximum vacuum degree is -70kPa.
**Warning: Customization design is required for pressures exceeding 200kPa, which increases costs by 3-5 times!
