This article's table of contents introduction:
- Breakdown of the Model Number: 9-26-8D
- Key Performance Characteristics (Approximate)
- Typical Applications
- Important Considerations for Purchase or Specification
Based on the model number you provided (9-26-8D), this is a specific type of industrial centrifugal fan. Here is a detailed breakdown of what this designation means, along with its typical specifications and applications.
Breakdown of the Model Number: 9-26-8D
This model number follows a standard Chinese naming convention for industrial fans (often used by manufacturers like Siemens (formerly TLT-Turbo), Shanghai Fan, or other Chinese OEMs):
-
9-26-: This is the Series Designation.
- 9: Represents the fan's specific pressure coefficient. Generally, a higher number means higher pressure.
- 26: Represents the fan's specific speed (n_s). A speed of 26 is relatively low, which is characteristic of a high-pressure, low-volume fan.
- Combined: The "9-26" series is a high-pressure centrifugal fan with backward-curved blades. It is designed to generate high static pressure, not high airflow volume.
-
-8D: This is the Size and Arrangement Code.
- 8: Refers to the impeller diameter in decimeters (dm). 8 dm = 800 millimeters (31.5 inches).
- D: Indicates the Drive Arrangement. "D" means the impeller is directly coupled to the motor via a flexible coupling (the motor shaft and the fan shaft are inline and connected, usually with the motor mounted on a common base plate). Note: Some manuals use "D" for overhung pulley drive, but in standard Chinese fan nomenclature (like GB/T 3235), "D" typically means direct drive with a coupling.
Key Performance Characteristics (Approximate)
These are typical values for a 9-26-8D fan running at 1450 RPM (4-pole motor). Always verify with the specific manufacturer's datasheet as performance varies.
| Parameter | Typical Value | Notes |
|---|---|---|
| Fan Series | 9-26 | High static pressure, low volume. |
| Blade Type | Backward curved, single thickness. | High efficiency for pressure generation. |
| Air Volume (Flow) | 3,000 – 10,000 m³/h (1,765 – 5,885 CFM) | The exact range depends on the system resistance. Max efficiency is usually around 6,000-7,000 m³/h. |
| Total Pressure | 4,000 – 8,000 Pa (400 – 800 mmH₂O / 16 – 32 inH₂O) | This is a very high pressure for an 800mm fan. |
| Motor Power | 15 – 30 kW (Most common: 18.5 kW, 22 kW, or 30 kW) | Motor size depends on the specific duty point and air density. |
| Motor Speed | 1450 RPM (4-pole) or 2900 RPM (2-pole) | "D" drive usually uses a 4-pole motor for this size. |
| Orientation | Usually horizontal (H), but can be vertical. | Inlet is axial (single-sided). Discharge can be rotated in various angles (0°, 45°, 90°, 135°, 180°). |
| Weight (approx.) | 400 – 600 kg (880 – 1320 lbs) | Fan only, excluding motor. |
Typical Applications
Due to its high pressure and relatively low volume, the 9-26-8D is used in applications requiring forced draft or high-resistance pneumatic conveying:
- Pneumatic Conveying: Moving cement, grain, wood chips, plastic pellets, and powders through pipelines.
- Industrial Air Supply: Forging furnaces, melting furnaces, cupolas, and industrial ovens (where high-pressure combustion air is needed).
- Dust Extraction: As a main fan for high-resistance baghouse filters or cartridge collectors.
- Vacuum Systems: As the prime mover for central vacuum cleaning systems in factories.
- Process Drying: High-pressure air for drying textiles, paper, or food products.
Important Considerations for Purchase or Specification
When sourcing or replacing a 9-26-8D fan, you need to confirm the following:
- Exact Air Volume (m³/h or CFM) and Total Pressure (Pa or inH₂O): The motor size and impeller speed are matched to a specific operating point. Running it off-design can overload the motor.
- Motor Power & Speed: As noted, usually 18.5kW to 30kW. Confirm if 1450 RPM (preferred for noise/life) or 2900 RPM is needed.
- Material of Construction: Standard is mild steel (Q235). Options include:
- Stainless Steel (SS304/316) for corrosive or sanitary environments.
- Wear-resistant lining (e.g., ceramic or hardox) for abrasive materials (cement, sand).
- Discharge Rotation: Top horizontal, top vertical, bottom horizontal, etc.
- Temperature Rating: Standard is for <80°C air. High-temperature versions (e.g., 250°C, 350°C, 600°C) are available with different shaft cooling and bearing designs.
- Standards Compliance: Confirm it meets your local electrical and safety standards (IEC, NEMA, etc.).
In summary: The 9-26-8D is a heavy-duty, high-pressure centrifugal fan designed to push air against significant resistance, commonly used in pneumatic conveying, furnace blowing, and industrial dust collection systems. The "D" drive indicates a direct-coupled motor arrangement.
