**Roots blower filter: function, selection and maintenance guide**
The filter screen (* * intake filter * *) of Roots blower is the core component of protective equipment, which directly affects the service life and operating efficiency of the fan. The following is an analysis of the filter:
---
**1、 The core function of the filter screen**
1. * * Blocking pollutants**
-Filter dust and particulate matter (such as factory dust, pollen, insects, etc.) in the air to prevent them from entering the fan chamber.
2. * * Protect the rotor and seal**
-Avoid hard particles from wearing the rotor or scratching the seals (with a gap of only 0.1~0.3mm).
3. * * Maintain system efficiency**
-A clogged filter will increase intake resistance, leading to a decrease in air volume and an increase in energy consumption.
---
**2、 Filter type and selection**
|* * Type * * | * * Applicable Scenarios * * | * * Filtering Accuracy * * | * * Advantages and Disadvantages * *|
|------------------|---------------------------|-------------|-------------------------------|
|* * Primary filter * * | Dusty environment (such as building materials, mines) | 50-100 μ m | Low cost, requiring frequent replacement|
|* * Medium efficiency filter * * | General industrial environment (food, chemical) | 10-50 μ m | Balanced filtration effect and pressure loss|
|* * Filter * * | Cleanroom, Medical Industry | 1-10 μ m | High filtration efficiency, but high pressure loss and cost|
|* * Oil bath filter * * | High humidity, oil mist environment (such as casting) | 5-20 μ m | Repeatable cleaning, moisture resistance|
**Key selection parameters * *:
-* * Filtration accuracy * *: Select according to the concentration of environmental dust (commonly 10-50 μ m).
-Initial pressure loss: ≤ 200Pa (too high will increase the load on the fan).
-Dust holding capacity: Determine the frequency of replacement (recommended for industrial environments to be ≥ 500g/m2).
---
**3、 Key points for installation and maintenance**
**1. Installation specifications**
-Location: It must be installed at the front end of the fan inlet, vertically or horizontally (to avoid rainwater backflow).
-Sealing: A sealing gasket should be added at the connection between the filter and the pipeline to prevent unfiltered air leakage.
-Rainproof design: Outdoor installation requires the installation of a rain cover or tilted placement.
**2. Maintenance cycle**
|* * Environmental conditions * * | * * Inspection frequency * * | * * Replacement/cleaning frequency * *|
|--------------------|-------------|------------------|
|Clean environment (indoor) | Weekly visual inspection | Every 3-6 months|
|Dusty environment (mine) | Daily visual inspection | Every 1-2 months|
|High humidity/oil mist environment | Weekly visual inspection | Monthly cleaning of oil bath filter screen|
**3. Cleaning and replacement methods**
-* * Cleanable filter screen * * (such as oil bath type, metal mesh):
1. Use compressed air for reverse blowing (pressure ≤ 0.3MPa).
2. The oil bath filter screen needs to be cleaned with kerosene and refilled with engine oil.
-* * Disposable filter * *: Replace directly and do not reuse.
**4. Blockage judgment and handling**
-Symptoms:
-The fan current increases but the air volume decreases.
-There is obvious dust accumulation on the surface of the filter or the differential pressure gauge shows exceeding the limit (pressure loss ≥ 500Pa needs to be replaced).
-Emergency response: Temporarily use low-pressure airflow to blow in the opposite direction and replace the filter screen as soon as possible.
---
**4、 Common Problems and Solutions**
|* * Problem * * | * * Reason * * | * * Solution * *|
|---------------------|------------------------|-------------------------------|
|* * Quick clogging of filter screen * * | Environmental dust exceeds the standard/improper selection | Upgrade the filtration level or install a pre filter|
|* * Damaged filter * * | Material not corrosion-resistant/mechanically damaged | Replace with corrosion-resistant material (such as stainless steel mesh)|
|* * Filter leakage * * | Aging/improper installation of sealing gasket | Replace sealing gasket and re tighten bolts|
---
**5、 Suggestions for special scenario applications**
1. High temperature environment: Choose a metal sintered filter screen (temperature resistance ≥ 200 ℃).
2. Corrosive gas: Use polytetrafluoroethylene (PTFE) coated filter material.
3. * * Pharmaceutical/Food Industry * *: Requires FDA certified silicone free filters.
---
**Summary**
The Roots blower filter is the "line of defense" to ensure stable operation of the equipment. **Regular maintenance of the filter is more economical than repairing the fan!
-* * Simple mnemonic * *:
-Check frequently in dusty environments and replace immediately when there is a high pressure difference.
-Sealed installation to prevent short circuits, selection and matching to save energy consumption.
Suggest integrating * * differential pressure alarm device * * into the fan control system to achieve intelligent maintenance.
