Hair dryer with air outlet arrangement

Abstract

The present invention relates to a hair dryer (100) and a nozzle (113, 310, 410) for a hair dryer (100), and more specifically to an air outlet arrangement (112, 220, 300, 400, 500, 600, 700). The air outlet arrangement (112, 220, 300, 400, 500, 600, 700) comprises a flow changing device (223, 224, 331, 341, 431, 531, 631, 632) for changing a flow of air at the air outlet arrangement (112, 220, 300, 400, 500, 600, 700), depending on a pressure and / or temperature within a housing (110), in particular within the nozzle (113, 310, 410).

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of hair dryers, and more specifically to an air outlet arrangement.BACKGROUND OF THE INVENTION[0002]A hair dryer is a device for drying hair by blowing heated air over the hair in order to accelerate the evaporation of water. An electrical hair dryer typically comprises a housing with an air inlet and an air outlet, a fan for generating a flow of air from the air inlet to the air outlet and a heating element for heating the flow of air. Nozzles, also referred to as concentrators, are optionally positioned at the air outlet, for example to increase the air speed for styling purposes. The user of a hair dryer with attached nozzle has the impression that the dryer is more “powerful” than without nozzle.[0003]For quick drying, a strong heating power is desirable. At the beginning of the evaporation process, the water held by the hair forms a thermal screen which prevents deterioration or burning of the hair or the sc...

AI Technical Summary

Benefits of technology

The present invention provides a hair dryer that can prevent damage to the hair and reduce discomfort to the user caused by overheating. The invention achieves this by automatically increasing the effective cross section of the air outlet arrangement when an obstacle blocks the air outlet, reducing the air mass per unit time that passes the heating element. The increased cross section allows the air to flow through a larger pathway, reducing the air temperature and preventing damage to the hair. Additionally, the invention includes a flow changing device that increases the effective cross section of the air outlet arrangement, increasing the air flow even if the air outlet is partially blocked. The flow changing device also includes a spring element that counteracts the opening force caused by the pressure within the housing, ensuring the air outlet remains closed until the opening force exceeds the closing force. The heating element and / or fan are also configured to prevent overheating in extreme scenarios, ensuring safety and comfort for the user.

Problems solved by technology

At high temperatures, the hair can be damaged and / or a burning sensation may arise, which may even lead to actual burning.

The problem is to achieve fast drying without damaging the hair.

If they get too close, for example less than 2 cm, the hair may be (partly) shutting off the air outlet area which reduces the air flow significantly.

The resistance can cause a reduction of the rotation speed of the fan and decrease the air flow.

The air temperature can increase up to potentially dangerous, hair damaging values.

However, the solution proposed in U.S. Pat. No. 5,790,749 involves additional effort for sensing and control circuitry.

This leads to a high complexity of today's hair dryers and increases the overall costs.

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