**Detailed explanation of key parameters of imported muffler for Roots blower**
**1. Core performance parameters**
|Parameter Category | Typical Parameter Range | Technical Description|
|-----------------|--------------------------|-------------------------------------------------------------------------|
|* * Silencing volume * * | 15-35dB (A) | 1/3 octave band silencing characteristic, with attenuation effect in the 250Hz-4kHz frequency band|
|* * Pressure loss * * | ≤ 300Pa (initial) | The pressure drop during filter cleaning will increase with blockage (recommended alarm value of 500Pa)|
|* * Flow adaptation * * | 5-500m3/min | Need to match fan calibration flow ± 10|
|* * Filtration accuracy * * | 80-120 mesh (optional) | Corresponding to 180-125 μ m pore size, special working conditions can be equipped with 5 μ m sintered filter element|
**2. Structural parameter standards**
```mermaid
graph LR
A [shell] -->B [material]
A -->C [wall thickness]
B -->| Carbon Steel | D [Q235B+Epoxy Spray]
B -->| Stainless steel | E [304/316L]
C --> F[3-6mm]
G [Internal Structure] -->H [Sound Absorption Layer]
H -->I [Glass wool/rock wool]
H -->J [thickness 50-100mm]
G -->K [Airflow Channel]
K -->L [honeycomb/baffle]
```
**3. Environmental adaptability parameters**
-* * Temperature Range * *:
-Standard type:- 20℃~120℃
-High temperature type: -40 ℃~300 ℃ (requires ceramic fiber lining)
-Explosion proof grade:
-Ex d Ⅱ CT4 (methane environment)
-Ex tb Ⅲ C (dust environment)
**4. Example of Acoustic Characteristic Curve**
Frequency (Hz) | 63 | 125 | 250 | 500 | 1k | 2k | 4k | 8k
---------|----|-----|-----|-----|----|----|----|---
Noise reduction volume (dB) | 5 | 8 | 15 | 22 | 28 | 25 | 18 | 12
**5. Selection calculation model**
**Flow verification formula * *:
```
Q = (πD2v)/4
Among them:
Q - Actual flow rate (m3/s)
D - Inner diameter of muffler (m)
V-airflow velocity (recommended 6-12m/s)
```
**Pressure drop calculation formula * *:
```
ΔP = ξ·(ρv2)/2
ξ - Resistance coefficient (0.8-1.2)
ρ - Gas density (kg/m3)
```
**6. Material Technical Specifications**
-* * Sound absorbing material * *:
-Bulk density: 48 ± 2kg/m3
-Fiber diameter: 4-6 μ m
-Hydrophobic rate: ≥ 98 (outdoor type)
-* * Metal mesh * *:
-Wire diameter: 0.15-0.3mm
-Weaving method: plain weave/diagonal weave
**7. Dynamic performance indicators**
-Pulse tolerance: capable of withstanding 0.5MPa instantaneous impact
-Vibration adaptability: ≤ 4.5mm/s (matching fan vibration standard)
**8. Interface standards**
|Connection method | Applicable pressure range | Sealing requirements|
|------------|----------------|-----------------------|
|PN10 flange | ≤ 1.0MPa | asbestos rubber pad+sealant|
|ANSI 150 | ≤ 2.0MPa | Metal winding pad|
|Quick release clamp | ≤ 0.6MPa | Silicone sealing ring|
**9. Maintain parameters**
-Cleaning cycle:
-Normal environment: 3-6 months
-Dust environment: 15-30 days
-* * Service life * *:
-Shell: 8-10 years
-Sound absorbing material: 3-5 years
**10. Special customized parameters**
-Anti corrosion type:
-Fiberglass shell+PP lining
-Suitable for corrosive environments with pH 2-11
-Low noise type:
-Double layered shell+Helmholtz resonant cavity
-Can reduce noise by an additional 5-8dB
**11. Certification standards**
-* * Noise Test * *:
-GB/T 4760-1995 Measurement Methods for Mufflers
-ISO 3744 Determination of Sound Power Levels
-* * Certification * *:
- CE PED 2014/68/EU
- ASME BPVC Section VIII
**12. Typical configuration scheme**
**Case: Q=30m3/min Roots blower**
```python
Calculation Example
Diameter=(30 * 4/(60 * 3.14 * 10)) * * 0.5 with v=10m/s
Print (f "inner diameter: {diameter:. 2f} m → select DN250")
Output result
Inner diameter: 0.252m → choose DN250
```
It is recommended to prioritize models with differential pressure gauges (range 0-1kPa), which will trigger an audible and visual alarm when the pressure difference exceeds 500Pa. For the pharmaceutical and food industry, compliance with FDA 21 CFR 177.2600 material standards is required.
