Cooling Helmet That Blows Water-Chilled Air over the Head

The problem

People who must wear helmets outdoors in summer - traffic police on duty, delivery riders, motorcycle commuters - spend hours with a hot, closed shell on their heads. Vents help only while moving, and cooling liners or wet bandanas lose their effect quickly. The patent describes the aim as keeping the head cool and fresh for these outdoor workers in hot weather, which it presents as a way to help prevent heatstroke.

The solution

The patent places a small cooling plant between the inner shell and the back of the helmet:

1. The helmet body (1) has a hinged visor (4) at the front and a rigid inner shell (3) lined with a 3D mesh fabric layer (5).
2. A water tank (6) sits between the inner shell and the rear wall. A thermoelectric cooling plate (7) on the tank wall chills the water; its hot side is joined by thermal glue (16) to a radiator (15) at the back of the helmet, with a deflector (17) guiding air over it.
3. An air inlet pipe (8) runs from outside the helmet, through a filter (10) and a micro air pump (11), and ends below the water level.
4. An outlet pipe (9) starts above the water level and leads to an air nozzle (12) at the top front of the inner shell.
5. A lithium battery (13) and controller (14) at the top inside run the pump and the cooling plate. A solar panel (19) under a clear cover (20) on the crown and a USB port (22) charge the battery.
6. Inside the tank, a partition (25) separates a refill chamber from a filter chamber (27) with a strainer (28). A float rod (40) moves a piston (36) in a sleeve (35) at the outlet pipe, and a proximity sensor (43) at the bottom triggers an alarm (23) when the water is low. Two tilt switches (44) sit in the sensor circuit.

According to the patent, hot outside air is cooled as it passes through the chilled water, and the patent also says the water helps clean the air before it reaches the wearer.

Who it is for

• Motorcycle and e-bike helmet brands looking for a premium summer feature for delivery and commuter riders.
• Workwear and PPE suppliers serving police, traffic, road-works and logistics fleets in hot regions.
• Cooling-gear companies that already sell neck fans and cooling vests and want a head-mounted product.
• Fleet operators and delivery platforms that buy riding gear in volume for their riders.

How it works

The main parts

Using it

1. Fill the tank through the filling pipe, which has a one-way valve; the drain pipe has a sealing plug.
2. Charge the battery by USB; the solar panel tops it up during the day.
3. Switch on. The cooling plate chills the water while the pump bubbles filtered outside air through it.
4. Cooled air flows from the nozzle over the head, spreading through the mesh liner.
5. Refill when the alarm sounds - the float has dropped to the sensor’s set level, adjustable by a threaded sleeve on the float rod.

Applications

Traffic police and road-side staff

Officers directing traffic stand in the sun for whole shifts; a cooling helmet adds comfort without the need for a separate cooling vest.

Delivery and courier riders

Food and parcel riders in hot cities ride stop-and-go, when vents do little. Fleet buyers can equip riders with a branded cooling model.

Motorcycle commuting in hot climates

Commuters in hot regions face slow traffic and long waits at lights; an active cooling module is a clear upgrade feature for a premium helmet line.

Outdoor work helmets

The same tank-and-nozzle system could be adapted to a hard hat for road works or construction, subject to that product’s safety standard.

Cooling modules for existing helmets

The tank, pump and battery could be developed as a module that fits specific helmet shells, sold as an accessory.

Where it is less suitable

• Bicycle racing and lightweight sport helmets - the tank, battery and pump add weight that road cyclists will not accept.
• Crash-critical designs without re-certification - adding a tank and electronics to a certified helmet changes it; every version must be tested to its standard again.