**Technical specification and selection guide for dust cover of Roots blower**
---
**1、 Core function of dust cover**
1. * * Three proof design**
-* * Preventing solid foreign objects * *: intercepting particles ≥ 50 μ m (compliant with IP5X protection level)
-* * Waterproof infiltration * *: inclined structure (drainage slope ≥ 15 °)
-* * Anti fiber entanglement * *: Punching mesh protection with aperture ≤ 10mm
2. * * Additional Value**
-Reduce intake vortex noise by 3-5dB (A)
-Prevent bird/rodent invasion
-Reduce maintenance frequency (extend filter life by 2-3 times)
---
**2、 Comparison of structural types**
|* * Type * * | * * Network Format * * | * * Louvred Window Type * * | * * Cyclone Separation Type * *|
|------------------|----------------------------|----------------------------|---------------------------|
|* * Structural features * * | Multi layer stainless steel wire mesh | Adjustable angle aluminum blades | Spiral shell+centrifugal separation structure|
|* * Filtration efficiency * * | 85 (50 μ m particles) | 60 (mainly prevents large particles) | 95 (particles above 20 μ m)|
|* * Pressure drop loss * * | 80-120Pa | 50-80Pa | 150-200Pa|
|* * Applicable scenarios * * | Conventional industrial environment | Outdoor rainy areas | High dust conditions (such as cement plants)|
---
**3、 Key design parameters**
```mermaid
graph TD
A [Dust Cover] -->B [Material]
A -->C [aperture]
A -->D [structural strength]
B -->B1 [304 stainless steel]&B2 [galvanized steel plate]&B3 [engineering plastic]
C -->C1 [coarse filter layer 10-20mm]&C2 [fine filter layer 1-5mm]
D -->D1 [Wind pressure resistance ≥ 800Pa]&D2 [Seismic grade 8]
```
1. * * Traffic matching formula**
$$
A_{min} = \frac{Q}{v} \times 1.2
$$
-(A_ {min}): Effective filtration area (m2)
-(Q): Fan flow rate (m3/s)
-(v): Allowable flow velocity (usually 2-3m/s)
2. Strength Calculation Standards**
-Mesh steel wire diameter ≥ φ 1.2mm (304 stainless steel)
-Supporting frame thickness ≥ 2mm (carbon steel spray coating)
---
**4、 Industry customized solutions**
1. * * Food and pharmaceutical industry**
-Material: 316L stainless steel (Ra ≤ 0.8 μ m)
-Quick release design: butterfly nut fastening (maintenance free tool)
-Compatibility: Can withstand steam at 121 ℃
2. Mining conditions**
-Wear resistant lining: with 3mm thick rubber sheet (Shore hardness 70A) inside
-Anti blocking design: Integrated gas pulse blowback system (0.5MPa compressed air)
3. * * Coastal areas**
-Surface treatment: hot-dip zinc+PVDF coating (salt spray resistance for 3000 hours)
-Drainage system: bottom collection tank+float valve automatic drainage
---
**5、 Installation specifications**
1. * * Spacing requirements**
-Distance from fan inlet ≥ 1.5 times the pipe diameter (to prevent airflow disturbance)
-Ground clearance height ≥ 1m (to avoid dust on the ground)
2. * * Sealing grade**
-Silicone sealing strip (compression capacity 30) is used at the flange connection
-The cable entrance adopts PG waterproof joint
3. * * Maintain the channel**
-Reserve ≥ 600mm operating space on one side
-Hinged door design (opening angle ≥ 90 °)
---
**6、 Performance testing standards**
|* * Testing project * * | * * Method basis * * | * * Qualified indicators * *|
|------------------|-------------------|--------------------------|
|Filtration efficiency | ISO 5011 | ≥ 85 (50 μ m particles)|
|Wind resistance characteristics | AMCA 210 | Δ P ≤ 150Pa@10m /s |
|Salt spray test | ASTM B117 | 1000h without red rust|
|Mechanical impact | IEC 60068-2-27 | 10 times 15g impact without deformation|
---
**7、 Intelligent upgrade plan**
1. * * Status monitoring type**
-Integrated differential pressure sensor (4-20mA output)
-LED blockage alarm (threshold can be set)
2. * * Self cleaning system**
-Rotating brush device (speed 15rpm)
-Timer control (adjustable interval 0-24h)
---
**8、 Selection calculation case**
**Given conditions * *:
-Fan flow rate: 30m3/min
-Dust concentration: 200mg/m3
-Protection level: IP55
**Calculation process * *:
1. Effective filtration area:
$$
A = \frac{30/60}{2.5} \times 1.2 = 0.24m2
$$
2. Selection results:
-Model: FMC-300 (304 stainless steel mesh type)
-Size: 500 × 500mm (actual area 0.25m2)
-Configuration: Differential pressure alarm (range 0-1kPa)
---
**9、 Maintenance procedures**
1. * * Daily inspection**
-Weekly visual inspection of dust accumulation
-Measure the pressure difference monthly (>300Pa requires cleaning)
2. * * Deep maintenance**
-Chemical cleaning: Soak in 5NaOH solution (plastic parts are prohibited)
-Ultrasonic cleaning: 40kHz/15min (precision grid)
3. * * Scrap standard**
-Grid damage rate>15
-Structural deformation>5mm/m
---
**Note * *: For explosive environments (such as coal powder working conditions), Ex tD explosion-proof certified products should be selected, and the surface temperature should be ensured to be less than 80 degrees Celsius (MIT) of the dust cloud ignition temperature. It is recommended to conduct integrity testing (using fluorescence leak detection method) every 6 months.
