Technical Explanation of Bladeless Air Purifier

A bladeless air purifier is a hybrid device that combines air purification technology with a bladeless (air-multiplier) airflow system. It cleans polluted air and delivers high-velocity smooth airflow without visible rotating blades.

1️⃣ Air Intake System

The base unit contains:

• Brushless DC Motor (BLDC)

• Centrifugal or mixed-flow impeller (hidden blades)

• Air intake vents

Working

• Ambient air enters through 360° intake perforations at the bottom.

• The BLDC motor rotates the internal impeller at 2,000–9,000 RPM, generating suction pressure.

• This negative pressure draws air through the filtration unit.

2️⃣ Filtration Stages

Most bladeless air purifiers use a multi-layer filter stack:

HEPA H13/H14 Filter

• Removes PM2.5, PM10, dust, smoke, allergens, bacteria.

• Efficiency: 99.95% for particles ≥ 0.3 microns.

Activated Carbon Filter

• Adsorbs VOCs, odors, formaldehyde, chemicals.

• Porous structure increases surface area for gas absorption.

Pre-filter (optional)

• Catches large particles like hair, lint.

UV-C or Ionizer (optional)

• UV-C kills microorganisms.

• Ionizer releases negative ions that bind dust.

3️⃣ Air Multiplier (Bladeless) Technology

This is the key technology that makes the purifier “bladeless”.

Components

• Hollow loop amplifier

• Internal duct channels

• Nozzle-shaped outlet

• Coandă effect airflow design

Working Principle

1. The clean air from the motor passes into the loop amplifier.

2. It is forced out through a 1–2 mm annular slit around the loop.

3. The fast-moving air creates a low-pressure region around the loop.

4. This pulls additional air from behind and around the device.

5. Result: Airflow is multiplied by 5–15 times (depends on model).