The installation of mufflers for Roots blowers needs to be scientifically arranged according to the characteristics of airflow and noise reduction requirements. The installation location and technical points are as follows:
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**1、 Comparison of core installation locations and functions**
|* * Installation location * * | * * Core functions * * | * * Technical points * *|
|--------------------|-----------------------------------------------------------------------------|-----------------------------------------------------------------------------|
|* * Air intake duct * * | 1 Reduce suction pulsation noise (main control 125-4000Hz)<br>2 Filter particulate matter (protect rotor clearance) | - Distance from fan inlet ≤ 1.5 times pipe diameter<br>- Filter must be installed (accuracy ≤ 100 μ m)<br>- When installing horizontally, a drainage slope (3 °) should be set up|
|Exhaust pipe * * | 1 Exhaust pressure pulsation (typical frequency 30-120Hz)<br>2 Reduce high-speed airflow regeneration noise | - Expansion joints should be installed to absorb thermal displacement<br>- Explosion disc installation distance ≤ 3m<br>- High temperature type requires insulation layer (>150 ℃ working condition)|
|* * Chassis body * * | 1 Suppress shell vibration radiation noise<br>2 Block the propagation of mechanical noise | - Adopt constrained layer damping structure (CLD)<br>- Sound insulation cover insertion loss ≥ 15dB (A)|
|* * Bypass pipeline * * | 1 Release pressure and reduce noise during uninstallation and startup<br>2 Diverting noise reduction when adjusting flow | - Muffler resistant to instantaneous impact ≥ 0.8MPa<br>- Valve action time<3 seconds (to prevent pressure surge)|
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**2、 Installation location optimization plan**
**1. Layout of intake muffler**
```mermaid
flowchart LR
A [Air Inlet] -->B [Rainproof Bend] -->C [Coarse Filter] -->D [Muffler] -->E [Soft Connection] -->F [Fan]
```
-Distance control: The distance between the muffler outlet and the fan inlet should be maintained at (1-1.2) x pipe diameter (DN)
-* * Typical parameters * *:
-Flow rate: 8-12m/s (DN100-DN300)
-Pressure drop: ≤ 250Pa (clean state)
**2. Exhaust muffler system configuration**
```mermaid
flowchart LR
G [fan] -->H [check valve] -->I [cooler] -->J [muffler] -->K [valve] -->L [main pipeline]
```
-* * Temperature control * *:
-When the exhaust temperature is greater than 120 ℃, an air cooler (cooling to below 80 ℃) needs to be installed in front of the muffler
-* * Pressure protection * *:
-The distance between the valve and the muffler is ≤ 5 times the diameter of the pipe (DN)
---
**3、 Installation specifications for special parts**
**1. Integrated installation of soundproof enclosure**
-* * Structural Parameters * *:
-Double layer steel plate (1.5+1.2mm) with 50mm rock wool clip
-The observation window adopts 5+5 laminated glass (sound insulation ≥ 30dB)
-* * Heat dissipation requirements * *:
-Each kW of power requires 0.2m2 of heat dissipation holes (equipped with soundproof louvers)
**2. Pipeline support noise reduction treatment**
-Elastic suspension standard:
|Pipeline diameter | Spring stiffness | Vibration isolation efficiency|
|----------|----------|----------|
| DN150 | 20N/mm | ≥85 |
| DN300 | 50N/mm | ≥80 |
-Anti vibration gasket: Oil resistant rubber (Shore hardness 60 ± 5)
---
**4、 Key indicators of installation process**
1. * * Coaxiality requirement * *:
-Flange docking deviation ≤ 0.05mm/m
-Angular deviation ≤ 0.1 °
2. * * Sealing grade * *:
-Static sealing: ISO 5208 Grade B
-Dynamic sealing: leakage rate ≤ 1 × 10 mbar · L/s
3. * * Dynamic balance impact * *:
-The additional quality needs to be controlled within 10% of the allowable unbalance of the rotor
---
**5、 Installation differences in different industries**
|* * Industry * * | * * Inlet side characteristics * * | * * Exhaust side characteristics * *|
|------------|--------------------------------|--------------------------------|
|Wastewater treatment | Anti condensation heating sleeve (50W/m) | Wet resistant muffler (drainage slope 5 °)|
|Chemical industry | Explosion proof type (Ex d Ⅱ CT4) | Anti corrosion lining (PTFE 3mm)|
|Food | Aseptic quick release structure (SMS seal) | Mirror polishing (Ra ≤ 0.4 μ m)|
---
**6、 Maintenance installation design**
1. * * Maintenance space reservation * *:
-The replacement side of the filter requires an operating space of ≥ 800mm
-The replacement of sound-absorbing materials requires a manhole with a diameter of over 300mm
2. * * Monitoring Interface * *:
-Differential pressure measuring point (G1/2 "internal thread)
-Noise monitoring point (1m away from the shell, 1.5m in height)
---
**7、 Analysis of installation failure cases**
-Case 1: The distance between the intake muffler is too far (>2 times DN)
-Phenomenon: Low frequency noise increases by 8dB
-Principle: The pipeline section forms a standing wave amplification
-* * Case 2 * *: Exhaust muffler not insulated
-Phenomenon: Carbonization of sound-absorbing materials
-Data: Failure after 200 hours of continuous operation at 150 ℃
---
**Practical suggestion * *: For high-power Roots blowers above 55kW, it is recommended to adopt a triple noise reduction scheme of "intake muffler+exhaust resistant muffler+soundproof cover", which can reduce the noise from 105dB (A) to below 82dB (A) at 1m. During installation, a laser alignment device is required to ensure the concentricity of the pipeline (deviation<0.1mm/m).
