Hair dryer
The hair dryer addresses inefficiencies in air flow direction and energy use by employing a curved shape unit and air guiding elements, resulting in improved air flow directionality and drying efficiency.
Patent Information
- Application Number
- PCT/CN2024/115981
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-09-19
- Filing Date
- 2024-08-30
- Publication Date
- 2025-03-27
AI Technical Summary
Existing hair dryers are inefficient in directing air flow effectively, leading to hair being blown away and reduced drying speed.
The hair dryer incorporates a curved shape unit with a fan unit and heater, utilizing the Coandă effect to guide air flow towards the user's hair, and includes air guiding elements to recirculate air and reduce energy consumption.
This design enhances air flow directionality, reduces hair blowback, and increases drying efficiency by recirculating thermal energy.
Smart Images

Figure CN2024115981_27032025_PF_FP_ABST
Abstract
Description
HAIR DRYERFIELD OF THE INVENTION
[0001] The invention relates to a hair dryer.BACKGROUND OF THE INVENTION
[0002] Prior art hair dryers generally comprise a housing, an air inlet allowing air to enter the housing, a fan to move the air from the air inlet via a heater to an air outlet where heated air leaves the housing.
[0003] WO2022157056A1 discloses a hair dryer for generating an air flow, the hair dryer comprising a curved shape unit defining an outer surface of the hair dryer, a first part of the outer surface being at an angle to a desired direction of the air flow, and a second part of the outer surface being aligned with the desired direction of the air flow; a fan unit at the first part of the outer surface, the fan unit having an air inlet, and an air outlet arranged for blowing air along the first part of the outer surface; and a heater arranged for heating a user’s hair.
[0004] US2021 / 307479A1 discloses a hair dryer comprising a primary air flow path extending from an inlet port provided on a first side of the hair dryer and extending to an outlet port. A water collection member can be located inward of the inlet port.SUMMARY OF THE INVENTION
[0005] It is, inter alia, an object of the invention to provide alternative designs of a hair dryer, which may be more efficient than existing hair dryers. The invention is defined by the independent claims. Advantageous embodiments are defined in the dependent claims.
[0006] As illustrated in WO2022157056A1, as a result of the Coandǎ effect, ambient pressure makes the air flow follow the shape of the curved shape unit. The air flow will thus be guided from the first part of the outer surface to the second part of the outer surface into the desired direction towards a user’s hair. The Coandǎ effect may also result in that ambient air not outputted by the fan unit is made to flow along with the air flow from the fan unit, thereby resulting in a total air flow that has more impact than just the air flow generated by the fan unit. The Coandǎ effect has been explained in https: / / en. wikipedia. org / wiki / Coand%C4%83_effect.
[0007] The disclosure further provides, in accordance with a first aspect, a hair dryer for generating an air flow, the hair dryer comprising a curved shape unit defining an outer surface of the hair dryer; a fan unit having an air inlet arranged for drawing air in a direction that is opposite to a desired direction of the air flow, and an air outlet arranged for blowing air along a first part of the outer surface; and a heater arranged for heating air.
[0008] It is noted, for the avoidance of any doubt, that the outer surface of the hair dryer means an exterior surface, in other words an outside surface, of the hair dryer.
[0009] The direction in which the air is drawn into the fan unit via the air inlet can be regarded as a first direction, and the desired direction of air flow can be regarded as a second direction.
[0010] Implicit in the above-described arrangement of the outer surface of the curved shape unit is that a first curving outer surface of the first part is included in the outer surface. The first curving outer surface is arranged to cause at least some of the air blown along the first part to be guided around the first curving outer surface and to leave the outer surface in the second / desired direction of air flow that is opposite to the (first) direction in which air is drawn into the fan unit via the air inlet.
[0011] For example, the first curving outer surface can curve at least partly around the fan unit’s air inlet so that the first curving outer surface guides air around the fan unit’s air inlet and can enable air to leave the outer surface in the second / desired direction of air flow (that is opposite to the (first) direction in which air is drawn into the air inlet) .
[0012] Alternatively or additionally, the first part of the outer surface may be the part of the outer surface at a back side of the hair dryer, which back side faces away from the air inlet of the fan unit.
[0013] The first curving outer surface may curvedly extend to reach to a point / position on the outer surface whose tangent is aligned with the second / desired direction of air flow.
[0014] It is noted that the first curving outer surface of the first part can curvedly extend to a second part of the outer surface so that at least some of the air blown along the first part is guided around the first curving outer surface to the second part, and leaves the outer surface in the second / desired direction of air flow that is opposite to the (first) direction in which air is drawn into the fan unit via the air inlet.
[0015] For instance, the first curving outer surface can curvedly extend in a convex manner, e.g. from the first part to the second part of the outer surface.
[0016] The first curving outer surface can, for example, curvedly extend in a convex manner away from the back side of the hair dryer and towards a front side of the hair dryer, towards which front side air is drawn in the first direction into the fan unit’s air inlet.
[0017] In some embodiments, the hair dryer comprises a second curving outer surface that curves towards the air inlet so as to guide part of the air guided by the first curving outer surface, e.g. part of the air guided by the first curving outer surface to the second part, back towards the air inlet. This second curving outer surface can enable some of the air to be recirculated back into the fan unit.
[0018] Such recirculation can assist to reduce energy consumption, via re-use of thermal energy, so that more efficient hair drying can be achieved.
[0019] It is noted that the second curving outer surface can be included, for example, in an additional part of the hair dryer, e.g. in an additional part of the curved shape unit, provided in addition to the first part and, in some embodiments in addition to the first part and the second part.
[0020] In some embodiments, the second curving outer surface curves towards the air inlet from the second part.
[0021] In such embodiments, the second part may be defined by the position on the outer surface reached by said at least part of the air prior to being guided back towards the air inlet, with the tangent of the position being aligned with the second / desired direction of the air flow.
[0022] In more general terms, it is noted that the second part of the outer surface can be aligned with the second / desired direction of the air flow.
[0023] Alternatively or additionally, the first part of the outer surface may be at an angle to the desired direction of the air flow.
[0024] As an alternative to the second part being merely defined by a position on the outer surface (whose tangent is aligned with the second / desired direction of the air flow) , the second part may be in the form of a tubular portion that extends away from the first curving outer surface of the first part. Such a tubular portion can assist to direct air in the second / desired direction of air flow.
[0025] In such embodiments, the second part may comprise, e.g. may at least partly delimit, one or more apertures for allowing part of the air guided to the second part to pass back towards the air inlet through the one or more apertures. In other words, the aperture (s) can permit recirculation of air back into the air inlet of the fan unit.
[0026] In embodiments in which the second curving outer surface is included, the second curving outer surface can be arranged to receive air that has passed through the one or more apertures.
[0027] In some embodiments, the hair dryer comprises one or more air guiding elements that protrude beyond the outer surface so as to guide a secondary flow of air displaced by the fan unit, with the secondary flow of air being spaced apart, in a direction away from the air inlet, from a primary flow of air guided by the outer surface. The air guiding element (s) can assist to alleviate the issue of hair being blown away from the hair dryer as a consequence of a so-called air multiplier effect caused by the air being guided around (at least) the first curving outer surface entraining air surrounding the outer surface. The latter can cause blowing of hairs, which may not be bundled but rather spread out, out of the drying airstream. By the air guiding element (s) providing a secondary flow of air that is spaced apart, in a direction away from the air inlet, from the primary flow of air provided by the outer surface that has not been guided by the air guiding element (s) , the hair can be brought by the secondary flow of air closer to the air inlet of the fan unit.
[0028] Moreover, the air guiding element (s) , which can be regarded as air guiding wings, can assist to provide hot air (heated by the heater) behind the hair once the hair is sucked / drawn onto an area of the hair dryer delimiting the air inlet. Such hot air can be sucked through the hair, which can help to increase drying speed.
[0029] For example, the plurality of air guiding elements can comprise a pair of air guiding elements spaced apart from, e.g. opposite, each other, with the fan unit’s air inlet being disposed in-between the pair of air guiding elements.
[0030] Such a pair of air guiding elements can each be arranged at sides of the hair dryer so as to delimit a central channel in-between the pair of air guiding elements for receiving hair.
[0031] The central channel can, for example, extend parallel with a handle of the hair dryer.
[0032] In this way, the central channel can receive hair in the direction in which it naturally falls.
[0033] The openings of the central channel towards the top of the hair dryer and towards the bottom of the hair dryer, when orientated for use, may provide air flow along the scalp direction.
[0034] By directing air at least partly across the scalp, rather than all of the hot air being directed towards the scalp (as in the case of conventional hair dryers) , the air guiding element (s) , e.g. the pair of air guiding elements, can make the hair dryer more scalp-friendly.
[0035] In some embodiments, the one or more air guiding elements inwardly curve, e.g. inwardly and convexly curve, towards a path taken by the air drawn into the air inlet along the first direction. This arrangement of the air guiding element (s) can assist to retain hair proximal to the hair dryer, by the secondary flow of air effectively providing an air curtain extending transverse to the first and second directions of air flow, which air curtain inhibits hair being blown away from the fan unit’s air inlet.
[0036] In embodiments in which the second curving outer surface is included, the, e.g. each of the, air guiding element (s) may protrude beyond the outer surface to reach an extremity spaced apart from the air inlet, with the second curving outer surface being arranged closer to the air inlet than the respective extremity.
[0037] In some embodiments, one or more of the air guiding element (s) is / are arranged to guide air displaced by the fan unit on an exterior surface of the air guiding element (s) . In such embodiments, the exterior surface can have a convex curvature.
[0038] In such embodiments, the Coandǎ effect can be utilized, in terms of the air flow over the exterior surface entraining surrounding air. This can assist the secondary flow of air to retain hair proximal to the hair dryer.
[0039] Alternatively or additionally, one or more of the air guiding element (s) is / are arranged to guide air displaced by the fan unit on an interior surface of the air guiding element (s) . In such embodiments, the interior surface can have a concave curvature.
[0040] In such embodiments, there may be no Coandǎ effect entraining surrounding air, which can assist to enhance thermal efficiency, since less surrounding, non-heated air is drawn into the hair dryer for heating by the heater.
[0041] Regarding position of the fan unit, the fan unit can be at the first part of the outer surface. In some embodiments, the air outlet of the fan unit is arranged within the hair dryer and is arranged to blow air along an interior conduit of the hair dryer, which interior conduit extends to reach the outer surface.
[0042] In some embodiments, the curved shape unit provides the hair dryer with a shower head-type shape. Such a shower head-type shape can make the hair dryer intuitive for the user to apply to their hair.
[0043] The curved shape unit may, for example, have a circular shape or an oval shape.
[0044] Alternatively or additionally, the air inlet can be concentrically arranged within the curved shape unit.
[0045] The first part of the outer surface may comprise an opening, with the position of the opening being aligned with the air inlet.
[0046] The opening may be in the center of the first part of the outer surface.
[0047] Alternatively, the opening can be in strip-shape away from the center of the first part of the outer surface.
[0048] The curved shape unit can thus define an inner surface which forms an inner cavity of the hair dryer, with the heater being positioned in the inner cavity.
[0049] As an alternative or in addition to the heater being positioned in the inner cavity, electronics and / or a motor, e.g. the motor of the fan unit, can be arranged in the inner cavity.
[0050] The hair dryer may comprise an air inlet grille whose inlet openings allow air to enter the fan unit via the air inlet. Such an air inlet grille can assist to avoid items accessing moving parts, such as fan blade (s) of the fan unit, within the hair dryer.
[0051] In some embodiments, the air inlet grille has outwardly protruding region (s) that outwardly protrude towards the front side of the hair dryer, towards which front side air is drawn into the air inlet in the second direction, and / or inwardly protruding region (s) that is / are inwardly recessed with respect to the front side of the hair dryer. Such a profile of the air inlet grille can assist to enable air to pass through the air inlet when hair is placed over the air inlet grille.
[0052] Alternatively, the air inlet grille may be a flat / planar air inlet grille. The flat hair-contacting surface of the flat / planar air inlet grille can assist in straightening / taming hair.
[0053] In some embodiments, the inlet openings comprise an arrangement of concentric annular slits. The concentric annular slits may, for example, be defined between dividing elements, with the dividing elements proximal to a periphery of the air inlet grille being more curved towards the curved shape unit than the dividing elements at or proximal to a center of the air inlet grille. This curved dividing elements design can follow the (primary) flow of air guided by the outer surface to reduce sound and drag. Moreover, this design can mean that the air flow direction is adjusted for optimal reflow / recirculation and reach of the air flow towards the hair.
[0054] In some embodiments, the dividing elements at or proximal to the periphery of the air inlet grille can guide air from the second curving outer surface into the concentric annular slits at or proximal to the periphery of the air inlet grille.
[0055] The heater included in the hair dryer can heat the air prior to the air leaving the hair dryer. In some embodiments, the heater comprises a heating wire, a coil heating element, a ceramic heater, a light source or any combination of aforementioned heater.
[0056] A key challenge may be mounting the heater to minimize blocking of air flow. For example, a mica supporter for supporting the heater can risk blocking the air flow.
[0057] In some embodiments, the heater comprises a coil heating element. A heat resistant cord may be arranged within the coil heating element, with the heat resistant cord comprising attachment portions, e.g. loops, that protrude through windings of the coil heating element to reach the outside of the coil heating element. The attachment portions can attach to mounting members, e.g. hooks, arranged in the hair dryer around the coil heating element.
[0058] This can provide, in the context of the hair dryer according to the present disclosure, a relatively high performance, low weight and low-cost heater construction.
[0059] The coil heating element may be mounted via the heat resistant cord and the mounting members around a wall delimiting an interior space within the hair dryer, e.g. around the inner cavity.
[0060] The spacing along the heat resistant cord between neighboring attachment portions, e.g. loops, may determine the number of windings of the coil heating element per segment of the coil heating element, with each segment being arranged between neighboring mounting members.
[0061] In some embodiments, the fan unit comprises a centrifugal fan. Such a centrifugal fan can provide a particularly effective / efficient blowing of air along the first part of the outer surface.
[0062] In some embodiments, the fan unit comprises a flat brushless DC motor. Such a motor can have noise reduction benefits, as well as enabling the hair dryer to be made more compact.
[0063] In some embodiments, a motor, e.g. the flat brushless DC motor, of the fan unit is mounted at the back of the fan unit. This can provide a relatively spatially efficient solution for mounting the fan unit.
[0064] The hair dryer can comprise a handle coupled to the curved shape unit for the user to grip. The handle can facilitate use of the hair dryer, since the user can grasp the handle and direct the air flow in the second / desired direction towards their hair (or someone else’s hair in the scenario that the user is using the hair dryer to dry and / or style another person’s hair) .
[0065] In some embodiments, the handle is rotatable, e.g. freely rotatable, relative to a drying unit of the hair dryer. For example, the handle may be rotatable, e.g. freely rotatable, relative to a drying unit comprising the curved shape unit, the fan unit and the heater.
[0066] This may permit an upper (drying unit-comprising) and lower (handle-comprising) part of the hair dryer to be passively or actively aligned with a hair direction of hair being treated using the hair dryer.
[0067] In some embodiments, the hair dryer comprises a sensor for sensing temperature of the air flow at the air outlet of the hair dryer, and the heater is controlled according to the sensed temperature of the air flow. Such feedback control can assist to ensure that the air being applied to hair is appropriately heated.
[0068] Alternatively or additionally, the hair dryer can comprise a distance sensor for sensing the distance between the hair dryer and the hair when in use, and the heater is controlled according to the distance between the hair dryer and the hair. This can assist to ensure that the air being applied to hair is at an appropriate temperature upon reaching the hair.
[0069] In some embodiments, the hair dryer comprises a communication unit for communicating with a mobile device. This can assist to enhance user experience, for example by enabling the user to control and / or monitor usage of the hair dryer via their mobile device.
[0070] It is noted that the hair dryer can be used for hair styling, e.g. taming and / or straightening, in addition to hair drying.
[0071] In some embodiments, the hair dryer comprises hair styling element (s) , e.g. detachable hair styling element (s) , for styling hair.
[0072] In some embodiments, the hair dryer comprises a hair brush that includes bristles for brushing hair.
[0073] Alternatively or additionally, the hair dryer may include a topical and / or additive element for nurturing hair.
[0074] In some embodiments, the hair dryer comprises a battery to supply power to the hair dryer. Such a battery can facilitate use of the hair dryer, for instance by avoiding such use being hampered by a power cable that connects the hair dryer to an external, e.g. mains, power source.
[0075] The hair dryer can accordingly be a cordless hair dryer, e.g. a cordless hair dryer comprising detachable hair styling attachment (s) .
[0076] In some embodiments, the battery may be included, e.g. stored, in the hair dryer’s handle.
[0077] Including the battery in the handle can be beneficial for size-and weight-related reasons. However, this can reduce available space in the handle for housing electronics. Moreover, high performance hair dryers tend to require more control electronics for motor control.
[0078] In some embodiments, an intermediate part, e.g. an intermediate part included in or defined by the curved shape unit, of the hair dryer is arranged between a first portion along which air is displaced by the fan unit in a first flow direction and a second portion along which air is displaced by the fan unit in a second flow direction different from the first flow direction.
[0079] In such embodiments, the intermediate part may contain at least one separator, e.g. wall, and one or both of control electronics and at least part of the fan unit, e.g. the motor.
[0080] Such accommodating of the control electronics and / or at least part of the fan unit in the intermediate part, e.g. within the curved shape unit, can free up space in a remainder of the hair dryer, for example to facilitate storage of a battery in the hair dryer’s handle.
[0081] According to another aspect there is provided a hair dryer for generating an air flow, the hair dryer comprising: a heater for heating air; a curved shape unit defining an outer surface of the hair dryer; a fan unit having an air inlet arranged for drawing air into the fan unit, and an air outlet arranged for blowing air along the outer surface; and one or more air guiding elements that protrude beyond the outer surface so as to guide a secondary flow of air displaced by the fan unit, the secondary flow of air being spaced apart, in a direction away from the air inlet, from a primary flow of air guided by the outer surface.
[0082] The air guiding element (s) can be according to any of the embodiments described above in relation to the first aspect. As previously noted, the air guiding element (s) can assist to alleviate the issue of hair being blown away from the hair dryer as a consequence of a so-called air multiplier effect caused by the air being guided around (at least) the first curving outer surface entraining air surrounding the outer surface. The latter can cause blowing of hairs, which may not be bundled but rather spread out, out of the drying airstream. By the air guiding element (s) providing a secondary flow of air that is spaced apart, in a direction away from the air inlet, from the primary flow of air provided by the outer surface that has not been guided by the air guiding element (s) , the hair can be brought by the second flow of air proximal to the hair dryer.
[0083] Furthermore, the air guiding element (s) , which can be regarded as air guiding wings, can assist to provide hot air (heated by the heater) behind the hair once the hair is sucked / drawn onto an area of the hair dryer delimiting the air inlet. Such hot air can be sucked through the hair, which can help to increase drying speed.
[0084] More generally, embodiments described herein in relation to the first aspect, for example in relation to the curved shape unit, the fan unit, the heater and / or the handle, can be applicable to the second aspect, and vice versa.
[0085] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.BRIEF DESCRIPTION OF THE DRAWINGS
[0086] Fig. 1A schematically shows a side view of an embodiment of a hair dryer.
[0087] Fig. 1B schematically shows a rear view of the hair dryer of Fig. 1A.
[0088] Fig. 1C schematically shows a front view of a hair dryer according to an example.
[0089] Fig. 2 schematically shows an air flow moving path of the hair dryer according to the embodiment of Figs. 1A to 1C when in use.
[0090] Fig. 3A schematically shows a hair dryer according to a second example.
[0091] Fig. 3B schematically shows an air flow moving path of the hair dryer shown in Fig. 3A.
[0092] Fig. 4 provides a schematic side view of a curved shape unit of a hair dryer according to a third example.
[0093] Fig. 5 provides a schematic side view of a hair dryer according to a fourth example.
[0094] Fig. 6 provides a schematic side view of a hair dryer according to a fifth example.
[0095] Fig. 7 provides a schematic side view of a hair dryer according to a sixth example.
[0096] Fig. 8 provides a schematic side view of a hair dryer according to a seventh example.
[0097] Fig. 9A provides a schematic side view of a hair dryer according to an eighth example.
[0098] Fig. 9B schematically shows a front view of the hair dryer of Fig. 9A.
[0099] Fig. 9C provides a schematic view from underneath the hair dryer shown in Fig. 9A.
[0100] Fig. 10A provides a schematic side view of a hair dryer according to a ninth example.
[0101] Fig. 10B schematically shows a front view of the hair dryer of Fig. 10A.
[0102] Fig. 10C provides a schematic view from underneath the hair dryer shown in Fig. 10A.
[0103] Figs. 11A to 11C respectively replicate the views provided in Figs. 10A to 10C together with hair being treated using the hair dryer.
[0104] Fig. 12 provides a schematic cross-sectional view of a hair dryer according to a tenth example.
[0105] Fig. 13 provides a schematic cross-sectional view of a hair dryer according to an eleventh example.
[0106] Fig. 14 provides a schematic side view of a hair dryer according to a twelfth example.
[0107] Fig. 15 provides a schematic side view of a hair dryer according to a thirteenth example.
[0108] Figs. 16 to 18 provide schematic views showing air inlet grilles of hair dryers according to further examples.
[0109] Figs. 19 to 21 provide schematic views showing hair proximal to the air inlet grilles shown in Figs. 16 to 18.
[0110] Fig. 22 provides an enlarged view of the example shown in Fig. 17, showing dividing elements that define annular slits provided in the air inlet grille.
[0111] Fig. 23 schematically depicts a control electronics-containing intermediate part of a hair dryer according to an example.
[0112] Fig. 24 shows a heater according to an example.
[0113] Fig. 25 schematically depicts mounting of the heater shown in Fig. 24 in the hair dryer.
[0114] Fig. 26 shows a heat resistant cord and mounting members for mounting a coil heating element of the heater shown in Figs. 24 and 25, but with the coil heating element itself being omitted from Fig. 26.
[0115] Fig. 27 shows the heat resistant cord and mounting members shown in Fig. 26, together with the coil heating element.DESCRIPTION OF EMBODIMENTS
[0116] Provided is a hair dryer for generating an air flow. The hair dryer comprises a heater for heating air, and a curved shape unit defining an outer, in other words exterior, surface of the hair dryer. The hair dryer also comprises a fan unit, which fan unit has an air inlet arranged for drawing air into the fan unit, and an air outlet arranged for blowing air along the outer surface.
[0117] Fig. 1A and Fig. 1B show a side view and a rear view, respectively, of an embodiment of a hair dryer. It is to be understood that the drawings are just rough sketches for the purpose of illustrating principles of the present disclosure.
[0118] The hair dryer comprises a curved shape unit 100 defining an outer surface of the hair dryer. A first part 111 of the outer surface is in this example at an angle to a desired direction of the air flow AF, and a second part 112 of the outer surface is aligned with the desired direction of the air flow AF. A fan unit 200 is shown in Fig. 1A being mounted at the first part 111 of the outer surface.
[0119] The curved shape unit 100 can also define an inner surface 120 at the opposite side of the outer surface. The inner surface 120 forms an inner cavity 130 of the hair dryer.
[0120] The fan unit 200 has an air inlet 210, in this example with an air inlet grille, and an air outlet 230, in this example with an air outlet grille. The air inlet is arranged for drawing air in a direction FD that is opposite to the desired direction of the air flow AF.
[0121] The first part 111 of the outer surface can have an opening 140. The opening 140 may be positioned at the center of the first part 111 of the outer surface as shown in Fig. 1A. The opening may be in any shape, such as a round shape, square shape, etc.
[0122] Advantageously, the position of the opening 140 can be aligned with the air inlet 210. Term “align” in this context means from front view or rear view, the opening 140 and the air inlet 210 has at least partial overlapping area. Preferably the opening 140 and the air inlet 210 have the same shape and completely overlap from front view or rear view, i.e. the air inlet 210 and the opening 140 are coincident at the first part 111 of the outer surface. Alternatively, the fan unit 200 may partially protrude inwardly to the inner cavity 130 through the opening 140 such that the air inlet 210 is in the inner cavity 130.
[0123] The fan unit 200 thus can draw air through the air inlet 210 from the side of the inner cavity 130. The fan unit 200 then blows air from the air outlet 230 along the first part 111 of the outer surface, and further, as a result of Coandǎ effect, ambient pressure makes the air flow following the shape of the curved shape unit 100. The air flow will thus be guided from the first part 111 of the outer surface to the second part 112 of the outer surface into the desired direction AF towards a user’s hair. The arrowed lines in Fig. 1A show the direction of the air flow being drawn and blown.
[0124] As shown in Fig. 1A, a first curving outer surface 111A of the first part 111 is included in the outer surface. The first curving outer surface 111A is arranged to cause at least some of the air blown along the first part 111 to be guided around the first curving outer surface 111A and to leave the outer surface in the desired direction of air flow AF that is opposite to the (first) direction FD in which air is drawn into the fan unit 200 via the air inlet 210.
[0125] For example, the first curving outer surface 111A can curvedly extend to the second part 112 of the outer surface so that at least some of the air blown along the first part 111 is guided around the first curving outer surface 111A to the second part 112 and leaves the outer surface in the desired direction of air flow AF that is opposite to the (first) direction FD in which air is drawn into the fan unit 200 via the air inlet 210.
[0126] As also shown in Fig. 1A, the first curving outer surface 111A of the first part 111 can curve at least partly around the air inlet 210 so that the first curving outer surface 111A guides air around the air inlet 210 and enables the air to leave the outer surface in the desired direction of air flow AF (that is opposite to the (first) direction FD in which air is drawn into the air inlet 210) .
[0127] In some embodiments, such as shown in Fig. 1A, the first part 111 of the outer surface may be the part of the outer surface at a back side BS of the hair dryer, which back side BS faces away from the air inlet 210 of the fan unit 200.
[0128] The first curving outer surface 111A of the first part 111 can curve in a convex manner to the second part 112 of the outer surface, in other words in a convex manner away from the back side BS of the hair dryer and towards a front side FS of the hair dryer, towards which front side FS air is drawn in the first direction FD into the air inlet 210.
[0129] In some embodiments, and still referring to Fig. 1A, the hair dryer comprises an additional part 113 comprising a second curving outer surface 113A that curves towards the air inlet 210 so as to guide part of the air guided to the second part 112 back towards the air inlet 210. This additional part 113 can enable some of the air to be recirculated back into the fan unit 200. Such recirculation can assist to reduce energy consumption, via re-use of thermal energy, so that more efficient hair drying can be achieved.
[0130] In some embodiments, such as shown in Fig. 1A, the second part 112 is in the form of a tubular portion that extends away from the first curving outer surface 111A of the first part 111. Such a tubular portion can assist to direct air in the desired direction of air flow AF.
[0131] In such embodiments, and referring now to Fig. 1C, the second part 112 may comprise, e.g. may at least partly delimit, one or more apertures 114 for allowing part of the air guided to the second part 112 to pass back towards the air inlet 210 through the one or more apertures 114. In other words, the aperture (s) 114 can permit recirculation of air back into the air inlet 210 of the fan unit 200.
[0132] When the hair dryer includes the second curving outer surface 113A, and referring to Figs. 1A and 1C, the second curving outer surface 113A can be arranged to receive air that has passed through the one or more apertures 114.
[0133] More generally, and still referring to Figs. 1A to 1C, a handle 300 may be coupled to the curved shape unit 100 for the user to grip.
[0134] As also shown in Fig. 1A, a heater 400 included in the hair dryer can heat the air prior to the air leaving the hair dryer. In some embodiments, such as shown in Fig. 1A, the heater 400 is arranged upstream of the air inlet 210, such that the air is heated prior to entering the fan unit 200 via the air inlet 210. In other embodiments, the heater 400 is arranged downstream of the air outlet 230, such that the air is heated after exiting the fan unit 200 via the air outlet 230.
[0135] The heater 400 may, for example, be positioned in the inner cavity 130. The heater 400 in this position may be safer than, for example, being wound around the outer surface of the curved shape unit 100.
[0136] In some embodiments, such as shown in Fig. 1A, the heater 400 comprises a heating wire 401 wound around a supporter 402. Preferably, the supporter 402 is mounted in the inner cavity 130 adjacent to the opening 140 and is co-axial with the opening 140. As a result, the air can be heated before the air is drawn into the fan unit 200. Alternatively, the heater 400 may be another type of heater 400, such as a ceramic heater, PTC heater, a light source, or a combination of different types of heaters 400.
[0137] In some embodiments, the handle 300 is rotatable, e.g. freely rotatable, relative to a drying unit of the hair dryer. For example, the handle may be rotatable, e.g. freely rotatable, relative to a drying unit comprising the curved shape unit 100, the fan unit 200 and the heater 400.
[0138] This may permit an upper (drying unit-comprising) and lower (handle-comprising) part of the hair dryer to be passively or actively aligned with a hair direction of hair being treated using the hair dryer.
[0139] Fig. 2 shows a hair dryer being in use to dry hair according to an embodiment. Arrowed lines in Fig. 2 show the air flow moving path including the directions of the air flow being drawn and blown. The inner cavity 130 of the curved shape unit 100 when in use faces the user’s hair, and the fan unit 200 can suck air from the side of the inner cavity 130, i.e. from side of the user’s hair, and the air can be heated by the heater 400 before entering the fan unit 200, and then the fan unit 200 blows hot air along the first part 111 of the outer surface to the second part 112 of the outer surface and towards the user’s hair. In other words, when in use, the desired direction of the air flow AF of the hair dryer is the direction towards the user’s hair, and the direction FD opposite to the desired direction of the air flow is the direction away from the user’s hair.
[0140] An advantage of this embodiment is that the user’s hair may not fly away because the force of blowing the hot air flow towards the hair is balanced by the force associated with air being sucked into the fan unit 200.
[0141] It can be seen from Fig. 2 that at least part of the hot air blowing from the second part 112 of the outer surface towards the hair can be recirculated to the fan unit 200 through the air inlet 210. Thus, a further advantage of this embodiment is that faster and more efficient drying can be achieved. This recirculation can be achieved due to inclusion of the second curving outer surface 113A, which curves towards the air inlet 210 so as to guide part of the air guided to the second part 112 back towards the air inlet 210.
[0142] The part of the air can reach the second curving outer surface 113A via the aperture (s) 114 in the tubular portion that defines the second part 112 of the outer surface, as previously described.
[0143] Moreover, in this embodiment, air flow may not completely escape as tends to be the case in a conventional hair dryer, and the device can be put on hair and scalp closely to further allow more efficient drying.
[0144] In some embodiments, and referring now to Figs. 3A, 3B and 4, the second part 112 is defined by a position on the outer surface reached by the part of the air (that has been guided on the first curving outer surface 111A to the second part 112) prior to being guided back towards the air inlet 210, with a tangent 115 of the position (see Fig. 4) being aligned with the desired direction of the air flow AF.
[0145] Fig. 4 schematically depicts guiding of air on the first curving outer surface 111A (see arrow 116A) to the position on the outer surface defining the second part 112, and part of the air being guided on the second curving outer surface 113A back towards the air inlet 210 (see arrow 116B) . It is to be understood that in this embodiment, the first curving outer surface 111A extends to the second curving outer surface 113A at the position defined by the second part 112. In this embodiment, a physical second part 112 is not present; the term “second part” being just used for defining a position.
[0146] In some embodiments, and continuing to refer to Fig. 4, the second curving outer surface 113A extends inwardly from the first curving outer surface 111A of the first part 111, so that the outer surface curvedly extends towards the air inlet 210 with a continuous curvature.
[0147] The arrow 116C in Fig. 4 denotes overall air flow (aside from the air flow leaving the outer surface in the desired direction of air flow AF) around the outer surface via the continuous curvature provided by the first curving outer surface 111A and the second curving outer surface 113A.
[0148] In more general terms, and referring to the embodiments shown in Figs. 1A to 4, it is noted that the second part 112 of the outer surface can be aligned with the second / desired direction of the air flow AF.
[0149] The air guided around the first curving outer surface 111A to the second part 112 can be regarded as reaching the point / position on the outer surface whose tangent 115 is aligned with the desired direction of air flow AF, and downstream of that point / position the air is guided along the tubular portion and / or along the second curving outer surface 113A.
[0150] Similarly with the embodiment of Figs. 1A and 1B, when in use, the fan unit 200 of the hair dryer shown in Figs. 3A, 3B and 4 can suck air from the side of the user’s hair, and the air can be heated by the heater 400 before entering the fan unit 200, and then the fan unit 200 blows hot air along the first part 111 of the outer surface to the second part 112 of the outer surface and towards the user’s hair. The arrowed lines in Fig. 3B show the direction of the air flow being drawn and blown. The opening 140 positioned close to the second part 112 of the outer surface allows the fan unit 200 to recirculate the hot air blowing along the second part 112 easily.
[0151] In some embodiments, such as shown in Fig. 4, internal air guides 117 are arranged in the air outlet 230 to guide air exiting the fan unit 200 onto, or at least towards, the outer surface.
[0152] Figs. 5 to 8 schematically illustrate variations to the design shown in Figs. 3A, 3B and 4. The embodiment shown in Fig. 5 differs from that shown in Fig. 4 in that the air outlet 230 is in a more forward position, in other words closer to the front side FS of the hair dryer.
[0153] The air flow is required to travel all around the outer surface in the embodiment shown in Fig. 4, whereas in the embodiment shown in Fig. 5 the air flow is required to travel around less outer surface.
[0154] Figs. 6, 7 and 8 schematically show examples in which the first curving outer surface 111A terminates before the line A (shown in Fig. 4) , with no second part 112 being included in the outer surface, and there is no second curving outer surface 113A curvedly extending inwardly toward the air inlet 210.
[0155] In some embodiments, and referring now to Figs. 9A to 9C and 10A to 10C, the hair dryer comprises one or more air guiding elements 118 that protrude beyond the outer surface so as to guide a secondary flow of air FP2, FP3 displaced by the fan unit 200, with the secondary flow of air FP2, FP3 being spaced apart, in a direction away from the air inlet 210, from a primary flow of air FP1 guided by the outer surface.
[0156] As best shown in Figs. 9B and 9C, such guiding element (s) 118 can comprise a plurality of air guiding elements 118 arranged around the air inlet 210.
[0157] For example, and still referring to Figs. 9B and 9C, the plurality of air guiding elements 118 can comprise, e.g. be in the form of, a pair of air guiding elements 118 spaced apart from, e.g. opposite, each other, with the fan unit’s 200 air inlet 210 being disposed in-between the pair of air guiding elements 118.
[0158] Such a pair of air guiding elements 118 can each be arranged at sides of the hair dryer so as to delimit a central channel for receiving hair. The central channel can extend parallel with the handle 300 of the hair dryer (referring again to Figs. 1A to 1C) . In this way, the central channel can receive hair in the direction in which it naturally falls.
[0159] The openings of the central channel towards the top of the hair dryer and towards the bottom of the hair dryer, when orientated for use, may be relatively large, to provide air flow along the scalp direction.
[0160] By directing air at least partly across the scalp, rather than all of the hot air being directed towards the scalp (as in the case of conventional hair dryers) , the air guiding element (s) 118, e.g. the pair of air guiding elements 118, can make the hair dryer more scalp-friendly.
[0161] The air guiding element (s) 118 can assist to alleviate the issue of hair being blown away from the hair dryer as a consequence of a so-called air multiplier effect caused by the air being guided around (at least) the first curving outer surface 111A entraining air surrounding the outer surface. The latter can cause blowing of hairs, which may not be bundled but rather spread out, out of the drying airstream. Referring to Figs. 11A to 11C, by the air guiding element (s) 118 providing the secondary flow of air FP3 that is spaced apart, in a direction away from the air inlet 210, from the primary flow of air FP1 on the outer surface that has not been guided by the air guiding element (s) 118, the hair HA can be retained by the secondary flow of air FP3 proximal to the hair dryer.
[0162] Moreover, the air guiding element (s) 118, which can be regarded as air guiding wings, can assist to provide hot air (heated by the heater 400) behind the hair HA once the hair HA is sucked / drawn onto an area of the hair dryer delimiting the air inlet 210. Such hot air can be sucked through the hair, which can help to increase drying speed.
[0163] In some embodiments, such as shown in Figs. 9A to 9C and 10A to 10C, the one or more air guiding elements 118 inwardly curve towards a path taken by the air drawn into the air inlet 210 along the first direction FD. This arrangement of the air guiding element (s) 118 can assist to retain hair proximal to the hair dryer, by the secondary flow of air FP2, FP3 effectively providing an air curtain extending transverse to the first direction FD and the desired direction of air flow AF, which air curtain inhibits hair being blown away from the air inlet 210.
[0164] In embodiments, such as that shown in Figs. 9A to 9C and 10A to 10C, in which the second curving outer surface 113A is included, the, e.g. each of the, air guiding element (s) 118 may protrude beyond the outer surface to reach an extremity 119 spaced apart from the air inlet 210, with the second curving outer surface 113A being arranged closer to the air inlet 210 than the respective extremity 119.
[0165] In some embodiments, and referring to Fig. 9C, one or more of the air guiding element (s) 118 is / are arranged to guide air displaced by the fan unit 200 on an exterior surface 118A of the air guiding element (s) 118. In such embodiments, the exterior surface 118A can have a convex curvature.
[0166] In such embodiments, the Coandǎ effect can be utilized, in terms of the air flow over the exterior surface 118A entraining surrounding air. This can assist the secondary flow of air FP2 to retain hair HA proximal to the hair dryer.
[0167] In other embodiments, and referring to Figs. 10C and 11C, one or more of the air guiding element (s) 118 is / are arranged to guide air displaced by the fan unit 200 on an interior surface 118B of the air guiding element (s) 118. In such embodiments, the interior surface 118B can have a concave curvature.
[0168] In such embodiments, there may be no Coandǎ effect entraining surrounding air, which can assist to enhance thermal efficiency, since less surrounding, non-heated air is drawn into the hair dryer for heating by the heater 400.
[0169] It is noted at this point that the hair dryer can have any suitable shape. In some embodiments, such as shown in Figs. 3A, 3B and 4, the curved shape unit 100 provides the hair dryer with a shower head-type shape. Such a shower head-type shape can make the hair dryer intuitive for the user to apply to their hair.
[0170] The curved shape unit 100 may, for example, have a circular shape or an oval shape.
[0171] A cross section of the curved shape unit 100 that is perpendicular with the first direction FD can have a round shape (disc shape without a hollow center, as shown in Fig. 12) , a ring shape (donut shape, e.g. with a hollow in the center, as shown in Fig. 13) , or a polygonal shape (e.g. rectangular, square, pentagonal, hexagonal, etc. ) . It is noted that the line CS in each of Figs. 12 and 13 is a cross-section line.
[0172] In some embodiments, such as shown in Figs. 12 and 13, the curved shape unit 100 is arranged to first guide airflow to the desired direction of airflow AF and then continuously guide the airflow to the air inlet 210.
[0173] Alternatively or additionally, and still referring to Figs. 12 and 13, the fan unit 200 may be arranged inside, e.g. entirely (including the motor 220) , the curved shape unit 100.
[0174] It is noted that the air inlet 210 can be concentrically arranged within the curved shape unit 100.
[0175] Regarding positioning of the fan unit 200, the fan unit 200 can be at the first part 111 of the outer surface. In some embodiments, such as shown in Figs. 12 and 13, the air outlet 230 of the fan unit 200 is arranged within the hair dryer and is arranged to blow air along an interior conduit of the hair dryer, which interior conduit extends to reach the outer surface.
[0176] The present disclosure further contemplates examples in which there is no outer surface arranged to guide air flow thereon so that the air flow leaves the outer surface in a desired direction of airflow AF that is opposite to the (first) direction FD in which air is drawn into the fan unit 200 via the air inlet 210. In this respect, Figs. 14 and 15 schematically depict hair dryers that do not have a fan unit 200 and an outer surface arranged in this manner, but which include the second curving outer surface 113A curvedly extending inwardly toward the air inlet 210. Thus, air is guided on the second curving outer surface 113A back towards the air inlet 210 (see the arrow 116B) .
[0177] It is noted with reference to Figs. 16 to 22, that the air inlet grille’s 211A, 211B, 211C inlet openings allow air to enter the fan unit 200 via the air inlet 210.
[0178] The inlet openings may be dimensioned, e.g. as mandated by IEC 61032, to avoid the user’s fingers from being able to pass through the inlet openings and reach moving part (s) of the hair dryer.
[0179] The air inlet grille 211A, 211B, 211C may also be arranged to optimize the above-described air recirculation and / or to prevent hair blocking of the air inlet 210, as well as permitting the air inlet grille 211A, 211B, 211C to approach the hair HA as closely as possible so as to enable fast and proper drying / styling. The air inlet grille 211A, 211B, 211C may furthermore be a source of drag (and thus a cause of lower efficiency) , as well as a cause of increased sound.
[0180] Accordingly, the air inlet grille 211A, 211B, 211C may be a key element in the hair dryer’s design.
[0181] The outer curvature or shape of the air inlet grille 211A, 211B, 211C and / or the inlet shape / pattern of the inlet openings through which air flows can be considered.
[0182] The outer curvature or shape can be related to positioning the hair HA and lessening the risk of blocking of the air inlet 210. In this respect, if the air inlet grille 211A, 211B, 211C is blocked, the air outlet 230 may not expel sufficient air to push away the hair HA. Subsequently the heater 400, if not controlled, can overheat, and the hair dryer may fail.
[0183] Therefore, the air outlet 230 may be configured to deliver sufficient air flow to push away the hair HA, and the air inlet 210 may be configured to draw enough air to pull hair HA towards the air inlet 210, but not so as to provide a higher suction force than the blowing force. In other words, the force F1 on hair HA from the air outlet 230 may need to be larger than the force F2 on hair HA (wet or dry) due to lower pressure provided at the air inlet 210 once the hair HA is pushed onto the air inlet grille 211A, 211B, 211C.
[0184] Figs. 8, 16 and 21 schematically depict an outwardly curved air inlet grille 211A, whose curvature causes a central region of the air inlet grille 211A to protrude, relative to a peripheral region of the air inlet grille 211A, towards the front side FS of the hair dryer (towards which front side FS air is drawn into the air inlet 210) .
[0185] Figs. 6, 17 and 19 schematically depict a planar, in other words flat, air inlet grille 211B. The flat hair-contacting surface of the flat / planar air inlet grille 211B can assist in straightening / taming hair HA.
[0186] Figs. 7, 18 and 20 schematically depict an inwardly curved air inlet grille 211C, whose curvature causes a central region of the air inlet grille 211C to be recessed, relative to a peripheral region of the air inlet grille 211C, away from the front side FS of the hair dryer.
[0187] The inwardly curved air inlet grille 211C (see Fig. 20) and the outwardly curved air inlet grille 211A (see Fig. 21) can assist to minimize the risk of the hair HA blocking the air inlet 210 compared to the planar air inlet grille 211B (see Fig. 19) .
[0188] The shape of the outwardly curved air inlet grille 211A can mean that hair HA can only contact the air inlet grille 211A in a limited area, preferably where the airflow is lowest, for example in the central region of the air inlet grille 211A.
[0189] In the case of the inwardly curved air inlet grille 211C, the hair HA may be most likely to contact the peripheral region of the air inlet grille 211C, and thus the central region of the air inlet grille 211C can be left open for air to pass therethrough.
[0190] In embodiments in which the air outlet 230 is annular, e.g. circular, the outwardly curved inlet grille 211A or the inwardly curved inlet grille 211C may be preferred, for recirculation of air back into the air inlet 210.
[0191] In more general terms, the air inlet grille 211A, 211C can have outwardly protruding region (s) that outwardly protrude towards the front side FS of the hair dryer (towards which front side FS air is drawn into the air inlet 210) , and / or inwardly protruding region (s) that is / are inwardly recessed with respect to the front side FS of the hair dryer.
[0192] Such a profile of the air inlet grille 211A, 211C can assist to enable air to pass through the air inlet 210 when hair HA is placed over the air inlet grille 211A, 211C.
[0193] The inlet shape / pattern of the inlet openings in the air inlet grille 211A, 211B, 211C is related to air drag, and hence is relevant to efficiency and sound. This inlet shape / pattern may be selected to create a desired overall air flow, allowing the air to reach further towards the hair HA before it is recirculated back into the air inlet 210. A reflow hair dryer, in which air is recirculated back into the air inlet 210, may be designed to direct air away from the hair dryer to dry hair HA, but also to collect air back into the air inlet 210 to reuse the heat.
[0194] In some embodiments, such as shown in Figs. 16 to 22, the inlet openings may comprise an arrangement of concentric annular slits.
[0195] In some embodiments, and as best shown in Fig. 22, the concentric annular slits may be defined between dividing elements 212, with the dividing elements 212 proximal to the periphery of the air inlet grille 211A, 211B, 211C being more curved towards the curved shape unit 100 than the dividing elements 212 at or proximal to the center of the air inlet grille 211A, 211B, 211C.
[0196] This curved dividing elements 212 design can follow the (primary) air flow FP1 pattern, and can be in line with air vectors, to reduce sound and drag. Moreover, this design can mean that the air flow direction is adjusted for optimal reflow / recirculation and reach towards the hair HA. Fig. 22 schematically shows how the dividing elements 212 can enable airflow optimization to allow reflow to happen with less or without losses and to get more flow out away from the hair dryer and back into the air inlet 210.
[0197] In some embodiments, and still referring to Fig. 22, the dividing elements 212 at or proximal to the periphery of the air inlet grille 211A, 211B, 211C can guide air from the second curving outer surface 113A into the concentric annular slits at or proximal to the periphery of the air inlet grille 211A, 211B, 211C.
[0198] In some embodiments, the opening 140 is in strip-shape positioned away from the center of the first part 111 of the outer surface. For example, the opening 140 is an annular strip shaped opening 140 and is close to the second part 112 of the outer surface as shown in Fig. 3A. Having a strip shaped opening 140 can allow relatively high pressure air flow.
[0199] More generally, the fan unit 200 can have any suitable design. In some embodiments, the fan unit 200 is a centrifugal fan. The fan unit comprises a motor 220. The motor 220 of the fan unit 200 may be positioned at the back of the fan unit 200 as shown in Fig. 1A. Alternatively, the motor 220 may be positioned at the front of the fan unit 200, or at the center of the fan unit 200, or any other suitable position as long as it can draw air in through the air inlet 210 and blow air out through the air outlet 230. It is to be understood that term “front” in the context of the present disclosure means the side that faces the user or is closer to the user than the “back” . In the embodiment shown in Fig. 1A, the back of the fan unit 200 is at the right-hand side, while the front of the fan unit 200 is at the left-hand side.
[0200] According to an embodiment, the hair dryer comprises a sensor (not shown in the Figures) for sensing temperature of the air flow at the air outlet 230 of the hair dryer. The temperature sensor may be an infrared temperature sensor, or any other type of temperature sensor known in the art. As mentioned above, the hair dryer according to the present disclosure may recirculate the hot air, therefore, the hair dryer may need less power. With the temperature sensor, it allows the heater 400 to be controlled according to the sensed temperature of the air flow.
[0201] When in use, the distance between the hair dryer and the hair HA may impact the amount of recirculated air flow, for example, the hot air might escape more when the hair dryer touches the hair HA. The hair dryer according to one embodiment may comprise a distance sensor (not shown in the Figures) for sensing the distance between the hair dryer and the hair HA when in use. The distance sensor may be any type known in the art, for example, infrared distance sensor, laser-based distance sensor, ultrasound distance sensor, camera-based distance sensor, etc. The heater 400 thus may be controlled based on the distance between the hair dryer and the hair HA when in use.
[0202] Optionally, the hair dryer comprises a communication unit (not shown in the Figures) for communicating with a mobile device, and hence the sensing signal may be sent from the hair dryer to the mobile device and the control signal may be sent from the mobile device to the hair dryer.
[0203] Optionally, because of the recirculated hot air, less power may be needed, and the hair dryer may only comprise a battery (not shown in the Figures) to supply power to the hair dryer. The battery may be a replaceable battery or a rechargeable battery. In other words, reflow hair dryers, in which air is recirculated back into the fan unit’s 200 air inlet 210 so as to enable thermal energy to be reused, can be battery powered.
[0204] In some embodiments, the battery, e.g. replaceable battery or a rechargeable battery, may be included in the handle 300.
[0205] Including the battery in the handle 300 can be beneficial for size-and weight-related reasons. However, this can reduce available space in the handle 300 for housing electronics. Moreover, high performance hair dryers tend to require more control electronics for motor control.
[0206] Accordingly in some embodiments, and referring to Fig. 23, an intermediate part, e.g. an intermediate part included in or defined by the curved shape unit 100, of the hair dryer is arranged between a first portion along which air is displaced by the fan unit 200 in a first flow direction 600 and a second portion along which air is displaced by the fan unit 200 in a second flow direction 601 different from the first flow direction 600.
[0207] In such embodiments, the intermediate part may contain at least one separator 602, 603, e.g. wall, and one or both of control electronics 604 and at least part of the fan unit 200, e.g. the motor 220. Such accommodating of the control electronics 604 and / or at least part of the fan unit 200 in the intermediate part, e.g. within the curved shape unit 100, can free up space in a remainder of the hair dryer, for example to facilitate storage of a battery in the hair dryer’s handle 300.
[0208] In some embodiments, and still referring to Fig. 23, the control electronics 604, the motor 220 and / or the heater 400 can be arranged in an inner cavity 630 of the hair dryer.
[0209] Regarding the heater 400, a key challenge may be mounting the heater 400 to minimize blocking of air flow. For example, a mica supporter 402 for supporting the heater 400, e.g. the heating wire 401 thereof, can risk blocking the air flow.
[0210] In some embodiments, and referring now to Figs. 24 to 27, the heater 400 comprises a coil heating element 410. A heat resistant cord 411 may be arranged within the coil heating element 410, with the heat resistant cord 411 comprising attachment portions 412, e.g. loops, that protrude through windings of the coil heating element 410 to reach the outside of the coil heating element 410. The attachment portions 412 can attach to mounting members 413, e.g. hooks, arranged in the hair dryer around the coil heating element 410.
[0211] This can provide, in the context of the hair dryer according to the present disclosure, a relatively high performance, low weight and low-cost heater 400 construction.
[0212] The coil heating element 410 may be mounted via the heat resistant cord 411 and the mounting members 413 around a wall delimiting an interior space within the hair dryer, e.g. around the inner cavity 130.
[0213] The spacing along the heat resistant cord 411 between neighboring attachment portions 412, e.g. loops, may determine the number of windings of the coil heating element 410 per segment of the coil heating element 410, with each segment being arranged between neighboring mounting members 413.
[0214] In some embodiments, and referring to Fig. 25, the heat resistant cord 411 is arranged within the coil heating element 410 by being fed through a center of the coil heating element 410 (see step 414 in Fig. 25) . The heat resistant cord 411 may be bound together, e.g. by joining free ends 415, 416 of the heat resistant cord 411 to each other (see step 417 in Fig. 25) .
[0215] Once the heat resistant cord 411 is bound together in a defined circle, the heat resistant cord 411, together with the coil heating element 410, can be mounted via the attachment portions 412, e.g. loops, attaching to the mounting members 413, e.g. hooks.
[0216] This may pull out the coil heating element 410 in a defined pitch. In this way, the requirement for an internal or relatively large external mica supporter 402 can be obviated.
[0217] Fig. 26 schematically depicts spanning of the heat resistant cord 411 (without showing the coil heating element 410) so that the attachment portions 412, e.g. loops, attach to the mounting members 413, e.g. hooks. Fig. 27 shows the thus spanned heat resistant cord 411 together with the coil heating element 410.
[0218] The following embodiments are also disclosed:
[0219] Embodiment 1. Hair dryer for generating an air flow, the hair dryer comprising:
[0220] a curved shape unit (100) defining an outer surface of the hair dryer, a first part (111) of the outer surface being at an angle to a desired direction of the air flow (AF) , and a second part (112) of the outer surface being aligned with the desired direction of the air flow (AF) ;
[0221] a fan unit (200) at the first part (111) of the outer surface, the fan unit having an air inlet (210) arranged for drawing air in a direction that is opposite to the desired direction of the air flow (AF) , and an air outlet (230) arranged for blowing air along the first part (111) of the outer surface; and
[0222] a heater arranged for heating air.
[0223] Embodiment 2. Hair dryer according to embodiment 1, wherein the first part of the outer surface comprises an opening (140) , and the position of the opening is aligned with the air inlet.
[0224] Embodiment 3. Hair dryer according to embodiment 2, wherein the opening (140) is in the center of the first part (111) of the outer surface.
[0225] Embodiment 4. Hair dryer according to embodiment 2, wherein the opening (140) is in strip-shape away from the center of the first part (111) of the outer surface.
[0226] Embodiment 5. Hair dryer according to any of the preceding embodiments, wherein the curved shape unit (100) defines an inner surface (120) which forms an inner cavity (130) of the hair dryer, the heater is positioned in the inner cavity.
[0227] Embodiment 6. Hair dryer according to embodiment 5, wherein the heater comprises at least one of the following: heating wire, ceramic heater, light source.
[0228] Embodiment 7. Hair dryer according to any of the preceding embodiments, wherein the fan unit comprises a centrifugal fan.
[0229] Embodiment 8 Hair dryer according to any of the preceding embodiments, wherein a motor (220) of the fan unit (200) is mounted at the back of the fan unit.
[0230] Embodiment 9. Hair dryer according to any of the preceding embodiments, wherein the fan unit comprises a flat brushless DC motor.
[0231] Embodiment 10. Hair dryer according to any of the preceding embodiments, wherein the hair dryer comprises a handle (300) coupled to the curved shape unit (100) .
[0232] Embodiment 11. Hair dryer according to any of the preceding embodiments, wherein the hair dryer comprises a sensor for sensing temperature of the air flow at the air outlet of the hair dryer, and the heater is controlled according to the sensed temperature of the air flow.
[0233] Embodiment 12. Hair dryer according to any of the preceding embodiments, wherein the hair dryer comprises a distance sensor for sensing the distance between the hair dryer and the hair when in use, and the heater is controlled according to the distance between the hair dryer and the hair. Embodiment 13. Hair dryer according to any of the preceding embodiments, wherein the hair dryer comprises a communication unit for communicating with a mobile device.
[0234] Embodiment 14. Hair dryer according to any of the preceding embodiments, wherein the hair dryer comprises a battery to supply power to the hair dryer.
[0235] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. Measures recited in mutually different dependent claims may advantageously be used in combination.
Claims
1.Hair dryer for generating an air flow, the hair dryer comprising:a curved shape unit (100) defining an outer surface of the hair dryer;a fan unit (200) having an air inlet (210) arranged for drawing air into the fan unit (200) in a first direction (FD) , and an air outlet (230) arranged for blowing air along a first part (111) of the outer surface, wherein the outer surface comprises a first curving outer surface (111A) of the first part (111) , the first curving outer surface (111A) being arranged to cause at least some of the air blown along the first part (111) to be guided around the first curving outer surface (111A) and to leave the outer surface in a second direction of air flow (AF) that is opposite to the first direction (FD) ; anda heater (400) arranged for heating air.2.Hair dryer as claimed in claim 1, comprising a second curving outer surface (113A) that curves towards the air inlet (210) so as to guide part of the air guided by the first curving outer surface (111A) back towards the air inlet (210) .3.Hair dryer as claimed in claim 2, wherein the first curving outer surface (111A) curvedly extends to the second curving outer surface (113A) .4.Hair dryer as claimed in claim 2 or claim 3, wherein the first curving outer surface (111A) curvedly extends to a second part (112) of the outer surface, the second curving outer surface (113A) curving towards the air inlet (210) from the second part (112) .5.Hair dryer as claimed in claim 4, wherein the second part (112) of the outer surface is aligned with the second direction of the air flow (AF) .6.Hair dryer as claimed in claim 4 or claim 5, wherein the second part (112) is a tubular portion that extends away from the first curving outer surface (111A) of the first part (111) .7.Hair dryer as claimed in claim 6, wherein the second part (112) comprises one or more apertures (114) for allowing part of the air guided to the second part (112) to pass back towards the air inlet (210) through the one or more apertures (114) .8.Hair dryer as claimed in any of the preceding claims, comprising one or more air guiding elements (118) that protrude beyond the outer surface so as to guide a secondary flow of air (FP2, FP3) displaced by the fan unit (200) , the secondary flow of air (FP2, FP3) being spaced apart, in a direction away from the air inlet (210) , from a primary flow of air (FP1) guided by the outer surface.9.Hair dryer as claimed in claim 8, wherein the one or more air guiding elements (118) inwardly curve towards a path taken by the air drawn into the air inlet (210) along the first direction (FD) . 10.Hair dryer as claimed in claim 8 or claim 9, wherein the one or more air guiding elements (118) is / are arranged to guide air displaced by the fan unit (200) on an exterior surface (118A) of the air guiding element (s) (118) and / or on an interior surface (118B) of the air guiding element (s) (118) , which interior surface (118B) faces away from the exterior surface (118A) .11.Hair dryer as claimed in any of claims 8 to 10 when dependent from any of claims 2 to 7, wherein the one or more air guiding elements (118) each protrude beyond the outer surface to reach an extremity (119) spaced apart from the air inlet (210) , the second curving outer surface (113A) being arranged closer to the air inlet (210) than the extremity (119) .12.Hair dryer as claimed in any of the preceding claims, comprising an air inlet grille (211A, 211B, 211C) having inlet openings for allowing air to enter the fan unit (200) via the air inlet (210) .13.Hair dryer as claimed in claim 12, wherein the air inlet grille (211A, 211C) has outwardly protruding region (s) that outwardly protrude towards a front side (FS) of the hair dryer, towards which front side (FS) air is drawn into the air inlet (210) , and / or inwardly protruding region (s) that is / are inwardly recessed with respect to the front side (FS) of the hair dryer.14.Hair dryer as claimed in claim 12, wherein the air inlet grille (211B) is a flat air inlet grill (211B) .15.Hair dryer as claimed in any of claims 12 to 14, wherein the inlet openings comprise an arrangement of concentric annular slits.16.Hair dryer as claimed in any of the preceding claims, wherein the heater (400) comprises a coil heating element (410) , wherein a heat resistant cord (411) is arranged within the coil heating element (410) , the heat resistant cord (411) comprising attachment portions (412) that protrude through windings of the coil heating element (410) to reach the outside of the coil heating element (410) , and wherein the attachment portions (412) attach to mounting members (413) arranged in the hair dryer around the coil heating element (410) .17.Hair dryer as claimed in any of the preceding claims, wherein the first part (111) of the outer surface is at an angle to the second direction of the air flow (AF) .18.Hair dryer as claimed in any of the preceding claims, wherein the fan unit (200) is at the first part (111) of the outer surface.19.Hair dryer as claimed in any of the preceding claims, wherein the air outlet (230) of the fan unit (200) is arranged within the hair dryer and is arranged to blow air along an interior conduit of the hair dryer, which interior conduit extends to reach the outer surface.20.Hair dryer as claimed in any of the preceding claims, wherein the first curving outer surface (111A) of the first part (111) curves in a convex manner.21.Hair dryer as claimed in any of the preceding claims, wherein the curved shape unit (100) provides the hair dryer with a shower head-type shape.22.Hair dryer as claimed in any of the preceding claims, wherein the first part (111) of the outer surface comprises an opening (140) , and the position of the opening (140) is aligned with the air inlet (210) .23.Hair dryer as claimed in claim 22, wherein the opening (140) is in the center of the first part (111) of the outer surface.24.Hair dryer as claimed in claim 22, wherein the opening (140) is in strip-shape away from the center of the first part (111) of the outer surface.25.Hair dryer as claimed in any of the preceding claims, wherein the curved shape unit (100) defines an inner surface (120) which forms an inner cavity (130, 630) of the hair dryer.26.Hair dryer as claimed in claim 25, wherein the heater (400) is positioned in the inner cavity (130, 630) , wherein the heater (400) comprises at least one of the following: heating wire (401) , coil heating element (410) , ceramic heater, light source.27.Hair dryer as claimed in claim 25 or claim 26, wherein electronics and / or a motor (220) is / are arranged in the inner cavity (130, 630) .
Citation Information
Patent Citations
Improved structure for hair dryer
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Hair dryer
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Hair dryer
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