CN-116782791-B - Hair care appliance

CN116782791BCN 116782791 BCN116782791 BCN 116782791BCN-116782791-B

Abstract

An accessory for a hair care appliance, the accessory comprising an air inlet, an air outlet. The accessory has a curved surface adjacent to and downstream of the air outlet, and a pair of guide walls for guiding the air flow along the curved surface. A pair of guide walls extending outwardly from the curved surface. A hair care appliance has an air inlet, an air outlet and an airflow generator for generating an airflow from the air inlet to the air outlet. The hair care appliance has a curved surface adjacent to and downstream of the air outlet, and a pair of guide walls for guiding the air flow along the curved surface. A pair of guide walls extending outwardly from the curved surface.

Inventors

T. Penel
A. PIERRE
D. Tibets
COURTNEY STEPHEN
COULTON ROBERT

Assignees

戴森技术有限公司

Dates

Publication Date: 20260512
Application Date: 20220106
Priority Date: 20210129

Claims (12)

1. An accessory for a hair care appliance, the accessory comprising: a hollow body comprising an air inlet and an air outlet; a curved surface adjacent to and downstream of the air outlet, wherein a first edge of the curved surface is attached to the hollow body adjacent to the air outlet and a second edge of the curved surface is a free edge such that the curved surface is overhanging with respect to the hollow body, and A pair of guide walls for guiding the air flow along a curved surface, the pair of guide walls extending outwardly from the curved surface, wherein the curved surface is a coanda surface.
2. The accessory of claim 1, wherein the pair of guide walls extend along substantially the entire length of the curved surface.
3. The accessory of claim 1 or 2, wherein the pair of guide walls includes a height substantially equal to a height of the air outlet.
4. An accessory according to claim 3, wherein the pair of guide walls comprises a height substantially equal to the height of the air outlet in a region adjacent the air outlet.
5. The accessory according to claim 1 or 2, wherein the pair of guide walls comprises a radius of curvature that is greater than a radius of curvature of the curved surface.
6. The accessory of claim 5, wherein the pair of guide walls includes a radius of curvature that is greater than a radius of curvature of the curved surface in a region adjacent to the air outlet.
7. The accessory of claim 1 or 2, wherein the pair of guide walls comprises a height that varies along a length of the guide walls.
8. The accessory of claim 7, wherein the pair of guide walls includes a height that decreases in a direction away from the air outlet.
9. The accessory of claim 1 or 2, wherein the pair of guide walls comprises a constant height along a length of the guide walls.
10. The accessory according to any one of claims 1-2, 4, 6, and 8, wherein the accessory is configured such that the air flow exiting the air outlet generates a first force that attracts relatively long hair toward the curved surface and a second force that pushes relatively short hair away from the curved surface.
11. A hair care appliance comprising an accessory according to any one of claims 1 to 10.
12. The hair care appliance of claim 11, wherein the hair care appliance comprises a handle unit within which the airflow generator is housed and an accessory releasably attached to the handle unit, the accessory comprising the air outlet, the curved surface and the guide wall.

Description

Hair care appliance Technical Field The present invention relates to a hair care appliance and an accessory for a hair care appliance. Background Hair care appliances are commonly used for drying and styling hair. If hair care appliances are used to style hair to create a smooth appearance, the presence of shorter or broken hair (sometimes referred to as flyhair (flyaways)) can affect the desired smooth appearance. Disclosure of Invention According to a first aspect of the present invention there is provided an accessory for a hair care appliance, the accessory comprising an air inlet, an air outlet, a curved surface adjacent to and downstream of the air outlet, and a pair of guide walls for guiding an air flow along the curved surface, the pair of guide walls extending outwardly from the curved surface. The attachment according to the first aspect of the invention may be advantageous in that the attachment comprises a curved surface adjacent to and downstream of the air outlet, and a pair of guide walls for guiding the air flow along the curved surface, the pair of guide walls extending outwardly from the curved surface. In particular, the inventors of the present application have determined that a curved surface adjacent to and downstream of the air outlet may create a negative pressure region adjacent to the curved surface that attracts long hair toward the curved surface, and that air flow interacting with the hair also pushes short hair away from the curved surface. This may result in shorter hair passing through longer hair, for example through the side of the longer hair facing the head of the user, thereby providing a smooth hair finish. By providing a pair of guide walls extending outwardly from the curved surface, the influence of ambient air on the negative pressure region created by the airflow flowing along the curved surface may be suppressed in use, and an increased attraction of hair to the curved surface may result compared to a similar arrangement, for example, without the guide walls. Each guide wall may be curved in form, for example having a curvature following the curvature of the curved surface. The guide walls of a pair of guide walls may be opposed to each other, for example, such that a channel is defined therebetween, the curved surface forming the base of the channel. The pair of guide walls may be spaced apart from each other along the curved surface, for example at opposite edges of the curved surface. The spacing between the guide walls may substantially correspond to the length of the air outlet. The curved surface may be substantially smooth and uninterrupted between the pair of guide walls. This allows the hair to be wrapped around the curved surface between the pair of guide walls in use. The guide wall may protrude outwardly from the curved surface, e.g. the guide wall and the curved surface are integrally formed as a single piece. The pair of guide walls may extend along substantially the entire length of the curved surface. This may ensure that the negative pressure region is maintained along substantially the entire length of the curved surface. The pair of guide walls may include a height substantially equal to the height of the air outlet. This may ensure that in use a negative pressure region is maintained along substantially the entire height of the air jet exiting the air outlet. The pair of guide walls may include a height substantially equal to the height of the air outlet in a region adjacent to the air outlet. The inventors of the present application have found that maintaining a region of negative pressure in the region adjacent the air outlet facilitates the generation of an air flow along the curved surface that generates a first force sufficient to attract relatively long hair toward the first surface, while also generating a second force that pushes relatively short hair away from the curved surface. The pair of guide walls may include a radius of curvature greater than a radius of curvature of the curved surface. For example, the pair of guide walls may include a radius of curvature that is greater than a radius of curvature of the curved surface in a region adjacent to the air outlet. This ensures that in use the pair of guide walls provide their function in the region near the air outlet. The pair of guide walls may include a height that varies along the length of the guide walls. The inventors of the present application have found that the guide wall provides the greatest influence in certain areas of the curved surface, for example in the area adjacent to the air outlet. The pair of guide walls may include a height that decreases in a direction away from the air outlet. By reducing the height of the guide wall in a direction away from the air outlet, less material may be required to form the guide wall than, for example, a constant height guide wall. The pair of guide walls may comprise a height that gradually decreases in a direction away from the a