**Technical guide for inlet muffler filter screen of Roots blower**
**1. The core function of the filter screen**
-* * Secondary noise reduction * *: Further attenuate high-frequency airflow noise through a multi-layer metal mesh structure (usually 3-5 layers)
-* * Core Protection * *:
-Intercept particles ≥ 5 μ m (protect rotor gap 0.1-0.3mm)
-Block insects/leaves and other foreign objects (essential for outdoor installation)
-* * Airflow optimization * *: Special weaving method controls pressure loss to ≤ 200Pa
**2. Comparison of filter types**
|Type | Structural Features | Applicable Scenarios | Life Cycle|
|------|----------|----------|----------|
|Stainless steel woven mesh | 304SS 80-100 mesh | Conventional industrial environment | 6-12 months|
|* * Sintered metal filter * * | Multi layer sintering 5-20 μ m | Chemical/dust environment | 3-6 months|
|* * Composite fiber mesh * * | PTFE coating | Pharmaceutical/food grade | Requires monthly replacement|
**3. Key technical parameters**
-* * Filtering accuracy * *:
-Ordinary type: 80 mesh (approximately 180 μ m)
-Precision type: 120 mesh (approximately 125 μ m)
-Flow area: ≥ twice the cross-sectional area of the intake pipe (to prevent flow velocity>8m/s)
-* * Voltage resistance level * *:- 5kPa~50kPa (special reinforcement required for vacuum conditions)
**4. Innovative structural design**
-* * Self cleaning filter * *:
-Integrated reverse pulse blowing device
-Automatically start when the pressure difference is greater than 500Pa
-Modular quick release design:
-Flange style buckle structure (replacement time<5 minutes)
-With transparent observation window (visual management)
**5. Selection Calculation Example**
**Given conditions * *:
-Fan flow rate: 20m3/min
-Imported pipe diameter: DN150
-Dust concentration: ≤ 50mg/m3
**Calculation process * *:
1. Effective filtration area=20 × 1000/(60 × 8) ≈ 42dm2
2. Selection results:
-Model: FML-150 × 300
-Structure: 304SS 100 mesh+front coarse filter screen
-Initial pressure drop: ≤ 150Pa
**6. Maintain management standards**
-* * Daily check * *:
-Weekly visual inspection of dust accumulation
-Measure the pressure difference monthly (normal<300Pa)
-Cleaning standards:
-Ultrasonic cleaning (frequency 40kHz, time ≤ 15min)
-Compressed air blowback (pressure ≤ 0.3MPa)
-* * Scrap standard * *:
-Mesh deformation>15
-Structural damage>3cm2
**7. Special application solutions**
-Explosion proof filter screen:
-Copper alloy material (compliant with ATEX standards)
-Static grounding device
-High temperature resistant type:
-310S stainless steel (resistant to 800 ℃)
-Ceramic fiber filling layer
**8. Fault Tree Analysis (FTA)**
```mermaid
graph TD
A [Decreased noise reduction effect] -->B {Filter problem}
B -->| Blockage | C [Pressure difference>500Pa]
B -->| Damaged | D [Foreign object entering]
C -->E [Cleaning/Replacement]
D -->F [Shutdown maintenance]
```
**9. Industry application data**
-Wastewater treatment plant: average replacement cycle of 9 months
-Cement industry: Pre filter required (extended to 4 months)
-Food and pharmaceuticals: must be processed daily
**10. Technological progress**
-* * Nano coated filter * *:
-Titanium dioxide photocatalytic coating
-Dual functionality (with a killing rate of over 99% against Escherichia coli)
-Intelligent monitoring system:
-Embedded differential pressure sensor
-4G wireless transmission alarm signal
It is recommended to use an endoscope to inspect the downstream pipeline of the filter screen every quarter to ensure that no particulate matter penetrates. For critical process steps, it is recommended to adopt a dual protection scheme of "main filter+backup filter".
