Impeller/Blade Assembly for Circulation Fans

Product Specifications

Technical details and manufacturing context for Impeller/Blade Assembly

Definition

The impeller/blade assembly is a critical rotating component within a circulation fan, consisting of blades mounted on a central hub. Its primary function is to convert rotational energy from the motor into kinetic energy of the air, moving air efficiently through the system. This assembly directly determines the fan's airflow rate, pressure generation, and energy efficiency. The impeller is designed to match the fan casing size and is available in a range of diameters (200–800 mm) and blade widths (50–200 mm). The number of blades typically ranges from 5 to 12, and the blade angle is set between 20° and 45° to optimize airflow efficiency. Maximum rotational speed is between 1450 and 2900 rpm, producing airflow up to 5000–50000 m³/h (tested per ISO 5801) and static pressure up to 500–2500 Pa (also per ISO 5801). The assembly can operate in temperatures up to 80–120°C, depending on material. Common materials include aluminum alloy (e.g., AL6061-T6 per ASTM B221), stainless steel, engineering plastics, and carbon fiber composites. Surface treatments such as anodizing (per MIL-A-8625) may be applied for corrosion resistance. The assembly is balanced to grade G2.5 per ISO 1940-1 to reduce vibration. Weight ranges from 5 to 50 kg, affecting installation requirements. When selecting an impeller, verify that the diameter matches the fan casing, the blade design meets airflow and pressure needs, and the material is suitable for the operating environment. Confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

When the impeller rotates, the angled blades impart momentum to the surrounding air molecules. This creates a pressure differential—lower pressure at the blade inlet and higher pressure at the outlet—which forces air to move through the fan housing. The specific blade geometry (angle, curvature, number) determines the airflow characteristics and efficiency. The rotating assembly converts mechanical energy from the motor into kinetic energy of the air, enabling the fan to move air against system resistance. The blade angle and curvature are designed to optimize the trade-off between airflow volume and pressure generation. The number of blades affects noise and performance; more blades generally provide smoother airflow but may increase drag. The impeller must be balanced to minimize vibration and ensure stable operation at high speeds. The material and surface treatment influence durability and corrosion resistance, which are critical for long service life in various environments.

Common Materials

Aluminum alloy, Stainless steel, Engineering plastics, Carbon fiber composites

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	200–800 mm	Matches fan casing size
Blade Width	50–200 mm	Affects airflow capacity
Number of Blades	5–12	Influences noise and performance
Blade Angle	20–45 °	Optimizes airflow efficiency
Max Speed	1450–2900 rpm	Higher speeds increase airflow
Max Airflow	5000–50000 m³/h	Depends on speed and blade designISO 5801
Max Static Pressure	500–2500 Pa	Overcome system resistanceISO 5801
Max Operating Temperature	80–120 °C	Material dependent
Material	AL6061-T6	Corrosion resistantASTM B221
Surface Treatment	Anodized	Improves durabilityMIL-A-8625
Balancing Grade	G2.5	Reduces vibrationISO 1940-1
Weight	5–50 kg	Affects installation

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Blades Part
Primary air-moving elements that create pressure differential and airflow

Material: Aluminum alloy or composite materials
Hub/Center Plate
Central mounting structure that connects blades to the motor shaft and maintains structural integrity

Material: Steel or aluminum
Blade Retainers Part
Mechanical fasteners or welds that secure blades to the hub

Material: Steel fasteners or weld material
Balance Weights Part
Small weights added during dynamic balancing to minimize vibration

Material: Lead or steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Circulation Fan

View system integration details

Manufacturers of Impeller/Blade Assembly

Manufacturer profiles associated with Impeller/Blade Assembly.

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Frequently Asked Questions

What is the typical diameter range for this impeller assembly?

The diameter range is 200–800 mm, which should match the fan casing size. Always verify the exact diameter required for your specific fan model with the manufacturer or supplier.

How does the blade angle affect performance?

The blade angle, typically 20–45°, influences airflow efficiency and pressure generation. A steeper angle can increase pressure but may reduce airflow, while a shallower angle may increase airflow but lower pressure. The optimal angle depends on the application requirements.

What materials are available for the impeller?

Common materials include aluminum alloy (e.g., AL6061-T6), stainless steel, engineering plastics, and carbon fiber composites. The choice depends on factors like operating temperature, corrosion resistance, and weight. Confirm material suitability with the manufacturer.

What standards are relevant for testing and balancing?

Airflow and static pressure are tested per ISO 5801. Balancing is done to grade G2.5 per ISO 1940-1. Surface treatment may follow MIL-A-8625 for anodizing. These standards serve as references; verify compliance with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 2 bar differential
flow rate:	Up to 50,000 CFM
temperature:	-40°C to 150°C
slurry concentration:	Not applicable for slurry; max 5% particulate loading in air

Impeller/Blade Assembly

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

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