**Technical Guide for High Pressure Roots Blowers**
High pressure Roots blower refers to a Roots type fan with a working pressure of 58.8 kPa (0.6 bar) or above, mainly used in industrial fields that require high exhaust pressure. The following is a professional technical analysis of high-pressure Roots blower.
**1、 Technical characteristics of high-pressure Roots blower**
**1. Structural reinforcement design**
|* * Component * * | * * High Voltage Type Improvement * *|
|----------------|--------------------------------|
|* * Chassis * * | Thickened cast iron or ductile iron (QT500-7)|
|* * Rotor * * | High strength alloy steel, precision dynamic balancing|
|* * Bearing * * | Heavy duty roller bearing (SKF/NSK)|
|* * Gear * * | Hard tooth grinding gear (accuracy level 5 or above)|
**2. Classification of pressure range**
-Medium high pressure type: 58.8-98kPa (0.6-1.0 bar)
-High pressure type: 98-196kPa (1.0-2.0 bar)
-Ultra high pressure type:>196kPa (special design required)
**2、 Key selection parameters**
**1. Performance parameter table**
|* * Parameters * * | * * Conventional High Voltage Type Range * * | * * Special Requirements for Ultra High Voltage Type * *|
|----------------|-----------------------|-----------------------|
|Airflow | 5-150m3/min | ≤ 50m3/min|
|Work pressure | 0.6-2.0 bar | 2.0-3.5 bar (customized)|
|Shaft power | 15-450kW | Special cooling system required|
|Rotational speed | 980-1450rpm | ≤ 980rpm (deceleration design)|
**2. Selection calculation formula**
**Actual working condition air volume correction * *:
\[
Q = Q_0 \times \frac{P_0}{P_0 + \Delta P} \times \frac{T}{T_0}
\]
-Q: Standard state air volume (m3/min)
-Δ P: Working pressure (kPa gauge pressure)
-T: Inlet temperature (K)
**Power Calculation * *:
\[
N = \frac{Q \times \Delta P}{60 \times \eta} \times K
\]
-η: Mechanical efficiency (0.65-0.75)
-K: Coefficient (1.1-1.2)
**3、 Special application solutions**
**1. Measures to deal with high-pressure working conditions**
-Multi stage series connection: Two stage Roots blower series connection (pressure up to 2.5 bar)
-Composite design: Roots+screw combination unit
-* * Gap Adjustment * *: Reserve 0.3-0.5mm thermal expansion gap under high temperature and high pressure
**2. Cooling system configuration**
|* * Cooling method * * | * * Applicable pressure range * * | * * Features * *|
|----------------|-------------------|------------------------|
|Natural air cooling | ≤ 0.8 bar | Low cost, easy maintenance|
|Forced air cooling | 0.8-1.5 bar | Additional cooling fan required|
|Water cooling jacket |>1.5 bar | Integrated water cooling for shell/bearing seat|
**4、 Typical industrial applications**
**1. Chemical industry**
-Chlor alkali industry: Chlorine gas pressurization (1.2-1.8 bar)
-Polyester production: EG steam cycle (temperature resistance of 200 ℃+high pressure)
**2. Environmental Protection Engineering**
-* * Garbage incineration * *: Flue gas recirculation (1.0-1.5 bar)
-Biogas Purification: Biogas Boosting (Explosion proof Design Required)
**3. Metallurgical industry**
-Blast furnace coal injection: coal powder conveying (1.6-2.0 bar)
-Electric furnace dust removal: High temperature flue gas treatment
**5、 Key points for installation, operation and maintenance**
**1. Special installation requirements**
-* * Basic seismic resistance * *: vibration acceleration ≤ 2.8mm/s2
-* * Pipeline support * *: Install shock-absorbing hangers every 3m
-* * Alignment accuracy * *: Coupling deviation ≤ 0.05mm
**2. Maintenance cycle table**
|* * Maintenance project * * | * * Standard cycle * * | * * High voltage type adjustment * *|
|----------------|------------|----------------------|
|Lubricating oil replacement | 1000 hours | 500 hours (high temperature and high pressure)|
|Bearing inspection | Half year | Quarterly|
|Gap measurement | 1 year | 6 months|
**6、 Common fault diagnosis**
|* * Fault phenomenon * * | * * High voltage specific cause * * | * * Solution * *|
|--------------------|-----------------------|-------------------------|
|Export temperature too high | compression ratio too high | increase inter stage cooler|
|Abnormal metallic sound | Friction caused by thermal deformation of rotor | Adjusting clearance after shutdown cooling|
|Large pressure fluctuations | Improper selection of check valve | Replacement of high-pressure dedicated check valve|
**7、 Selection recommendation**
**1. Suggestions for pressure segmentation selection**
-0.6-1.0 bar: Standard high voltage type (such as JR series)
-1.0-2.0 bar: reinforced type (such as series)
-* *>2.0bar * *: Customization is required for multi-level or composite types
**2. Brand performance comparison**
|* * Brand * * | * * Pressure Limit * * | * * Features * *|
|----------------|------------|------------------------|
|| 2.5bar | Technology, 30-50% higher price|
|Shandong | 1.8bar | High cost performance, perfect after-sales service|
|Shaanxi blower | 2.2bar | Military quality, impact resistance|
**Engineering suggestion * *:
1. If the pressure is greater than 1.5 bar, a water cooling system must be configured
2. It is recommended to install a flywheel energy storage device for frequent start stop conditions
3. Corrosive media require stainless steel rotors and PTFE coating
If you need a specific selection plan, please provide:
① Medium characteristics ② Working pressure curve ③ Daily operating time
