Centrifugal Stirrer Shaft Length 40cm
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A centrifugal stirrer is a specialized laboratory tool designed for high-efficiency mixing, particularly within vessels that have narrow necks. It features a unique collapsible impeller design: the blades remain folded so they can pass through small openings, then expand outward as the rotational speed increases.
Key Features and Mechanics
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- Expansion Mechanism: The stirrer uses centrifugal force to open its two blades during operation. As the speed increases, the blades move from a vertical position to a horizontal one, creating a radial flow pattern.
- Design Similarity: Once fully expanded, its mixing effect is comparable to that of a 4-bladed propeller stirrer.
- Operating Speed: These stirrers typically require medium to high speeds (often between 800 and 2,000 RPM) to generate the necessary force to deploy the blades and mix effectively.
- Materials: Most are made of stainless steel or coated in PTFE (Teflon) for high chemical resistance and wide temperature tolerance (e.g., -200°C to +250°C).
Primary Applications
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- Narrow-Neck Vessels: Its primary purpose is mixing in round-bottom flasks or other containers where a standard fixed-width impeller cannot fit through the opening.
- Homogenization: Used for blending, homogenizing, and processing media across various viscosities in research, pharmaceutical, and chemical laboratories.
- Specialized Mixing: Found in applications like soil elution testing or preparation of lotions and creams where high shear or thorough blending is needed.
Comparison with Other Stirrers
| Feature | Centrifugal Stirrer | Magnetic Stirrer |
|---|---|---|
| Drive Mechanism | Motorized overhead shaft | Rotating magnetic field |
| Impeller Type | Collapsible/Opening blades | Small magnetic stir bar |
| Vessel Compatibility | Best for narrow-neck flasks | Best for open beakers |
| Volume/Viscosity | Handles high volumes and viscosities | Limited to small, low-viscosity samples |
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