RU174129U1 - HAIR DRYER - Google Patents

Abstract

The device for drying hair contains the main channel (400) of the medium flowing from the main inlet (40) of the medium to the main outlet (440) of the medium, a fan assembly (70) for drawing the primary medium into the main channel of the medium, a heater (80) for heating primary medium in the main channel of the medium. The cross-sectional area of the main channel of the medium flowing near the heater is larger than near the fan assembly. The primary medium flowing through the heater has a lower speed than the primary medium flowing through the fan assembly, and the speed of the primary medium increases from the main fluid inlet to the fan assembly by reducing the cross-sectional area from the main fluid inlet to the fan assembly. The noise produced by the device is reduced due to stabilization of the fluid flow. 12 zpp, 46 silt.

Description

The utility model relates to a hand-held electric appliance, in particular to an electric appliance for hair care, such as a hair dryer or a brush for hot hair styling.

Blower devices, and in particular thermal blower devices, are used for a number of applications, such as drying substances, such as paints, or drying hair, or cleaning or removing surface layers. In addition, thermal blowers, such as hot hair styling brushes, are used to style hair in a wet or dry state.

In general, an engine and a fan are provided that draw the medium into the housing; the medium may be heated before entering the enclosure. The engine may be damaged by foreign objects such as dirt or hair, which is why a filter is usually installed at the inlet end of the blower device. Typically, such electrical appliances are equipped with a nozzle that can be attached to and removed from the appliance, while the above nozzle can change the shape and flow rate of the medium leaving the appliance. Such nozzles can be used to concentrate the effluent from the appliance or to disperse the effluent depending on the user's requirements at a particular time.

The first object relates to a hair dryer.

In a preferred embodiment, the device for drying hair contains a main channel of the flowing medium, continuing from the main inlet of the medium to the main outlet of the medium, a fan unit that draws the primary medium into the main channel of the flowing medium, a heater for heating the primary medium in the main channel of the flowing medium, while the primary the medium flowing through the heater has a lower speed than the primary medium flowing through the fan assembly.

Preferably, the heater is located downstream of the fan assembly.

In a preferred embodiment, the cross-sectional area of the main channel of the flowing medium varies along the main channel of the flowing medium.

Preferably, the cross-sectional area of the main channel of the flowing medium near the heater is larger than near the fan assembly.

In a preferred embodiment, the device for drying hair contains a handle, while in the above handle is the main inlet of the medium.

Preferably, the hair dryer comprises a housing, and a main outlet of the medium is provided in the body, wherein the main channel of the current medium continues inside the handle from the main inlet of the medium to the body.

In a preferred embodiment, the fan assembly is located in the handle.

Preferably, the handle is substantially perpendicular to the body.

In a preferred embodiment, the main channel of the current medium continues in the first direction in the handle and in the second direction in the housing.

Preferably, the first direction is substantially perpendicular to the second direction.

In a preferred embodiment, the primary medium flowing through the main outlet of the medium has a higher speed than the primary medium flowing through the heater.

Preferably, the primary medium flowing through the main outlet of the medium has a speed similar to that of the primary medium flowing through the heater.

In a preferred embodiment, the speed of the primary medium increases from the main inlet of the medium to the fan assembly.

Preferably, the speed of the primary medium decreases from the fan assembly to the housing.

In a preferred embodiment, the device for drying hair contains a channel of the current medium, which continues from the inlet of the medium into the housing to the release of medium from the housing.

Preferably, in the housing, the main channel of the current environment surrounds the channel of the current environment.

In a preferred embodiment, the housing comprises an internal duct that separates the main channel of the current medium and the channel of the current medium.

Preferably, a heater surrounds the internal duct.

In a preferred embodiment, the heater extends along the internal duct.

Preferably, the hair dryer comprises a high speed electric motor. The device for drying hair contains a fan assembly for creating an air flow, wherein the fan assembly comprises an air inlet, an air outlet, a fan wheel and an electric motor for rotating the wheel to create an air stream passing from the air inlet to the air outlet, the electric motor having a rotor, which during operation can rotate at a speed of at least 50,000 rpm. Preferably, the rotor can rotate at a speed of at least 80,000 rpm. Preferably, the rotor can rotate at speeds up to 110,000 rpm. Preferably, the hair dryer is a reinforced hair dryer, thereby the fan assembly does not process the entire stream that exits the hair dryer, i.e. some of the flow passing through the hair dryer is captured by the medium drawn into the hair dryer through the action of an electric motor. Preferably, the fan assembly is placed in the handle of the hair dryer.

A utility model provides a device for drying hair containing a fan assembly, which includes a high pressure electric motor. Preferably, the pressure generated by the electric motor is 1400-2250 Pa. For an engine with a cable cross-section within 25 mm ^2, this corresponds to a flow rate of 9.4–12 l / s and an engine speed of 84000–105000 rpm. Thus, the electric motor is located inside the gripping handle, preferably having a diameter of 35–42 mm.

The outer wall thickness is preferably less than 2 mm and more preferably less than 1 mm. Ideally, the thickness is about 0.7 mm.

In another aspect, the diameter of the handle is 20-60 mm and preferably 30-50 mm. Most preferably, the diameter of the handle is 35–42 mm.

The device for drying hair contains a handle in which an electric motor is installed, and the wall of the handle is covered with sound-absorbing material. The thickness of the sound-absorbing material is 4–6 mm.

The hair dryer includes a handle in which a fan assembly is placed, and the handle contains sound-absorbing material. The sound-absorbing material preferably comprises at least an intake silencer or exhaust silencer. Preferably, the length of the exhaust silencer S _O from the end of the fan assembly downstream to the end of the handle 20 downstream is up to 100 mm. Preferably, the length of the intake silencer S _I from the end of the fan assembly upstream to the end of the intake downstream is 10-200 mm. Preferably, the ratio between the intake silencer S _I and the exhaust silencer S _{O is} greater than 1.2. In a hair dryer 10 having a handle 20 with a constant diameter, this ratio preferably exceeds 0.1.

There is a relationship between the housing length Lx from the inlet of the medium to the handle edge upstream and the housing length Lz from the handle edge downstream to the medium outlet at the end of the housing downstream. Ideally, Lz≤40 mm and Lx≤20 mm. Preferably 2Lx = Lz.

The device for drying hair has a relationship between the diameter d _{a of the} outer wall of the housing and the diameter d _{b of the} internal duct. The ratio d _b : d _{a is} preferably 0.49-0.6 in a hair dryer having a handle with a constant diameter.

The ratio of d _b : d _{a is} preferably 0.4–0.9 in a hair dryer having a handle with a variable or variable diameter.

The device for drying hair has a relationship between the length l _{2 of the} body and the diameter d _{h of the} handle. The ratio l ₂ : d _{h is} preferably 1.9-2.5 in a hair dryer having a constant handle diameter. The ratio l ₂ : d _{h is} preferably 1.9–2.5 in a hair dryer having a variable or variable handle diameter.

The device for drying hair has a relationship between the diameter d _{a of the} outer wall of the body and the diameter d _{h of the} handle. The ratio d _b : d _{h is} preferably 1.6-3.4 in a hair dryer having a handle with a constant diameter.

The device for drying hair has a relationship between the length l _{2 of the} body and the diameter d _{a of the} body. The ratio of l ₂ : d _{a is} preferably 1.1-1.6 in a hair dryer containing a fan assembly in a handle. As for the drying apparatus, where the heater is located in the housing and the fan assembly is located in the handle, the ratio l ₂ : d _{a is} preferably 0.8-1.6.

The device for drying hair has a relationship between the length l _{2 of the} body and the diameter d _{b of the} internal duct. The ratio of l ₂ : d _{b is} preferably 1.8-3.4. For appliances where a heater is located in the housing and a fan assembly is located in the handle, the ratio l ₂ : d _{b is} preferably 1–3.4.

The device for drying hair contains an internal duct connected to the outer wall through the side wall. In an embodiment, the side wall is perpendicular to the outer wall.

The device for drying hair contains a handle and a housing, while the flow in the main channel of the medium in the housing is located 90 ° to the flow in the main channel of the medium in the handle. Preferably, the main flow of the medium in the housing is parallel to the medium that flows in the flow channel of the medium.

The device for drying hair contains a housing having an internal duct containing a conical part and a tubular part, the radius r between the conical part and the tubular part of the inner duct being 0.5-50 mm.

The device for drying hair contains a housing having an internal duct containing a conical part and a tubular part, the conical part at least partially restricting the inlet of the medium, and the tubular part at least partially restricting the outlet of the medium, and the internal duct increases diameter from the conical part to the medium outlet.

The hair dryer comprises an outer wall, an inlet end and an outlet end, wherein a bevel is provided at the outlet end, and at the aforementioned bevel, the diameter of the outer wall decreases toward the center A-A of the outer wall, and the bevel is 30-60 °. In the ideal case, the bevel is 30-60 °. Preferably, the front bevel is 35-55 ° and more preferably the front bevel is 45 °.

The hair dryer has a housing containing a main outlet of the medium bounded by a first surface and a second surface of the body, wherein the first surface and the second surface are substantially parallel surfaces forming an outer annular restriction and an inner annular restriction, respectively, for the main outlet of the medium. Preferably, the housing comprises an inner duct, and the first surface and the second surface are substantially parallel to the inner duct.

The hair dryer has a housing containing a main outlet of the medium bounded by a first surface and a second surface of the body, wherein the first surface and the second surface are substantially parallel surfaces forming an outer annular restriction and an inner annular restriction, respectively, for the main outlet of the medium. Preferably, the housing comprises an internal duct, and the first surface and the second surface are inclined to the inner duct near the main outlet of the medium.

The hair dryer has a housing containing a main outlet of the medium bounded by the first surface and the second surface of the body, the first surface and the second surface being essentially parallel surfaces forming an outer annular restriction and an inner annular restriction, respectively, for the main outlet of the medium . Preferably, the housing comprises an internal duct, and the first surface and the second surface are inclined from the internal duct near the main outlet of the medium.

The hair dryer comprises a housing having an outer wall and a handle substantially perpendicular to the housing and having a medium inlet at least partially limited by a side wall that extends from the tubular outer wall to the center of the tubular outer wall, while the side wall is inclined at an angle of 1-90 ° to the tubular outer wall. Preferably, this angle is 30-60 °. More preferably, this angle is 45 °.

The following is a description of a utility model as an example with reference to the attached drawings, in which

FIG. 1 is a perspective view of an apparatus for drying hair according to a utility model;

FIG. 2 is a sectional view of the hair dryer of FIG. one;

FIG. 3a is a side view of the inner wall of the hair dryer;

FIG. 3b is a sectional view of an internal duct of a hair dryer;

FIG. 4 is a side view of a hair dryer;

FIG. 5 is a rear view of a hair dryer;

FIG. 6 is another side view of a hair dryer;

FIG. 7 is a front view of a hair dryer;

FIG. 8 is a bottom view of a hair dryer;

FIG. 9 is a perspective rear view of a hair dryer;

FIG. 10 is a graph showing the length of silencers located in the handle of a hair dryer;

FIG. 11a - 11d are end views of alternative hair drying apparatus according to a utility model;

FIG. 12 is a side view of an apparatus for drying hair according to a utility model;

FIG. 13a and 13b are side views of hair dryer according to a utility model;

FIG. 14a and 14b are end views of some other hair drying apparatus according to a utility model;

FIG. 15a, 15b and 15c are side views of some other devices for drying hair according to a utility model;

FIG. 16a, 16b, 16d and 16e are side views of alternative devices for drying hair according to a utility model;

FIG. 16c and 16f are respective end views of the alternative hair drying apparatus of FIG. 16a, 16b, 16d and 16e;

FIG. 17a is a side view in section of a device for drying hair according to a utility model;

FIG. 18a - 18d is a side view in section of other devices for drying hair according to a utility model;

FIG. 19a and 19b are alternative front bevels of the device for drying hair according to a utility model;

FIG. 20a - 20c - alternative designs of the releases of the device for drying hair according to a utility model;

FIG. 21 is a side view in section of a device for drying hair during use;

FIG. 22a is a graph of a velocity profile from the beginning to the end of a hair dryer according to a utility model; and

FIG. 22b is a schematic sectional view of a main flow path of a medium.

In FIG. 1 and 2, an apparatus 10 for drying hair with a handle 20 and a housing 30 is shown. The handle has a first end 22 connected to the housing 30 and a second end 24 remote from the housing 30, which includes a main inlet 40 of the medium. To supply power to the device 10 for drying hair, a wire 50 is provided.

The housing 30 has a first end 32 and a second end 34 and may consist of two parts. The first part 36 extends from the first end 32 and is generally tubular, and the second part 38 extends from the second end 34 and is connected to the first part 36. The second part 38 has a conical shape and varies in diameter along its length from the diameter of the first part 36 housing 30 to a smaller diameter at the second end 34 of the housing. In this example, the second part 38 has a constant slope, and the angle α, which is formed from the outer wall 360 of the first part 36 of the housing 30, is approximately 40 °.

The handle 20 has an outer wall 200 that extends from the body 30 to the far end 24 of the handle. At the far end 24 of the handle, an end wall 210 extends across the outer wall 200. A wire 50 enters the hair dryer through this end wall 210. The main fluid inlet 40 in the handle 20 includes first openings 42 that extend around and along the outer wall 200 the handle, and the second holes 46, which extend across and through the end wall 210 of the handle 20. The wire 50 is located approximately in the middle of the end wall 210 and extends from the center of the handle 20. The end wall 210 is perpendicular to the outer wall 200 and the inner wall 220 p hibernation.

In front of the main inlet 40, a fan assembly 70 is installed. The fan assembly 70 includes a fan and an engine. The fan assembly 70 draws the medium through the main fluid inlet 40 to the housing 30 through the main fluid passage 400, which extends from the main fluid inlet 40, and into the housing 30 at the location where the connection 90 of the handle 20 and the housing 30 is located. The main flow channel 400 the medium continues through the housing 30 to the second end 34 of the housing around the heater 80 and to the main outlet 440 of the medium, where the medium that is drawn in by the fan assembly leaves the main channel 400 of the flowing medium. The main channel 400 of the flowing medium is non-linear and passes through the handle 20 in the first direction and through the housing 30 in the second direction, which is perpendicular to the first direction.

The housing 30 includes an outer wall 360 and an internal duct 310. A main flow path 400 extends along the housing from the connection 90 of the handle 20 and the housing 30 between the outer wall 360 and the duct 310 to the main outlet 440 of the medium at the second end 34 of the housing 30.

Inside the housing there is another channel for the flowing medium; this medium does not pass directly through the fan assembly or heater, but is drawn into the hair dryer through the action of the fan assembly, which generates the main flow through the hair dryer. This flow of medium is captured in the device for drying hair with a medium passing through the main channel 400 of the flowing medium.

The first end 32 of the housing includes an inlet 320 of the medium, and the second end 34 of the housing includes the outlet 340 of the medium. Both the inlet 320 of the medium and the outlet 340 of the medium are at least partially determined by the duct 310, which is the inner wall of the housing 30 and extends inside along the housing. The flow path 300 extends inside the duct from the fluid inlet 320 to the fluid outlet 340. At the first end 32 of the housing 30, a side wall 350 extends between the outer wall 360 and the duct 310. This side wall 350 at least partially defines the fluid inlet 320. A gap is provided at the second end 34 of the housing between the outer wall 360 and the duct, wherein the aforementioned gap defines the main outlet 440 of the medium. The main outlet 440 of the medium is annular and surrounds the flow channel 300. The main outlet 440 of the medium may be internal, so that the main channel 400 of the flowing medium is connected to the channel 300 of the flowing medium inside the housing 30. Alternatively, the main outlet 440 of the medium is external and exits the casing 30 to the external medium separately from the channel 300 of the flowing medium at the outlet 340 environments.

The outer wall 360 of the housing approaches the duct 310 and the center line AA of the housing 30. The proximity of the outer wall 360 to the duct 310 has the advantage that the main stream exiting the main outlet 440 of the medium is directed to the center line AA of the housing 30. Medium, exiting the main outlet 440 of the medium, causes the capture of the medium 490 from the outside of the hair dryer due to the movement of the medium from the main outlet 440. This effect is increased by the outer wall 360, approaching the duct 310. This is partly due to the fact that basically The first stream is concentrated, not diverging, and partly with the fact that the outer wall 360 of the housing 30 is inclined to the second end 34 of the hair dryer.

Duct 310 is the inner wall of the hair dryer, which may be accessible from outside the hair dryer. Thus, the duct is the outer wall of the device for drying hair. An air duct 310 is placed inside the housing 30, so that a side wall 350 that connects the outer wall 360 and the duct 310 is inclined relative to the outer wall 360.

In the housing 30, next to the side wall 350 and the inlet 320 of the medium, there is a printed circuit board 75, including electronic control circuits of the device for drying hair. The printed circuit board 75 has an annular shape and extends around the duct 310 between the duct 310 and the outer wall 360. The printed circuit board 75 is operatively connected to the main flow path 400. The circuit board 75 extends around the flow path 300 and is isolated from the flow path 300 by the duct 310.

The circuit board 75 controls parameters such as the temperature of the heater 80 and the speed of the fan assembly 70. An internal wiring (not shown) electrically connects the printed circuit board 75 to the heater 80 and the fan assembly 70 and the wire 50. Control buttons 62, 64 are connected to the printed circuit board 75 so that the user can make a choice, for example, from a range of temperature settings and costs Wednesday.

During use, the medium is drawn into the main channel 400 of the flowing medium through the action of the fan assembly 70, optionally heated by the heater 80 and leaves the main outlet 440 of the medium. This treated stream causes entrainment of the medium into the flow path 300 at the fluid inlet 320. The medium is connected to the treated stream at the second end 34 of the housing. In the example shown in FIG. 2, the treated stream exits the main outlet 440 of the medium and the hair dryer as an annular stream that surrounds the captured stream exiting the hair dryer through the medium outlet 340. Thus, the medium treated by the fan assembly and the heater is amplified by the trapped stream.

The handle 20 has an outer wall 200 and an inner wall 250, which at least partially define the main channel 400 of the flowing medium through the handle 400. The inner wall 250 extends from the housing 30 to the end 254 in the direction of the second end 24 of the handle 20. The handle 20 is tubular and the outer wall 200 of the handle 20 is a cylindrical sleeve made of any suitable material, such as molded plastic, or a rolled sheet of metal, such as aluminum, aluminum alloy or steel. The handle is connected to the housing 30 at the first end 22, and at the distal second end 24, a main fluid inlet 40 is provided. The main inlet 40 of the medium is the first means of filtering the medium, which enters the main channel 400 of the flowing medium.

As shown in FIG. 3, sound-absorbing material 270 is located between the inner wall 250 and the outer wall 200. The sound-absorbing material 270 is foam or felt, which at least reduces the noise (has a sound-absorbing effect) produced when the medium is drawn into the handle 20 by the fan assembly 70. For clarity, sound-absorbing material 270 is shown only around a portion of the inner wall 250. In order to ensure contact between the sound-absorbing material 270 and the medium flowing into the main flow passage 400, and thereby reduce noise, the inner wall 250 includes perforations 256 that extend around and at least partially along the length of the inner wall 250.

Sound-absorbing material 270 is provided to reduce the noise produced when the medium is drawn into the main inlet 40 of the medium by the action of the fan assembly 70.

The perforations 256 of the inner wall 220 have a diameter that is selected to most effectively reduce noise. Suitable diameters are 1 to 10 mm; smaller diameters are more suitable for obtaining the proper sound power (attenuation of sound in the main range of human hearing), and larger diameters are more suitable for reducing high-frequency vibrations. Perforations form at least 40% of the surface area of the inner wall 220, 250.

Due to the presence of sound-absorbing material 270 located behind the inner wall 250, it is possible to use sound-absorbing material of a greater thickness than if sound-absorbing material 270 was directly exposed to the main channel of the flowing medium. This is due to the fact that the diameter of the main channel 400 of the flowing medium is limited by the inner wall 250, which compresses the sound-absorbing material 270 in the gap between the inner wall 250 and the outer wall 200 of the handle 200. The thickness of the sound-absorbing material is 4-6 mm, but it will compress between the outer wall 200 and inner wall 250.

An important hallmark of the presence of the multilayer handle 20 is that the properties of the materials can be used to reduce the noise produced by the product. The airborne noise produced by the fan assembly 70 and the medium flowing into the main flow channel 400 is reduced by sound-absorbing material 270; however, to some extent, noise is transmitted through sound-absorbing material 270.

An additional necessary distinctive feature of the handle 20 is that it must be rigid enough to ensure its reliable grip and prevent bending, which could cause a narrowing of the main channel of the flowing medium. Therefore, materials such as aluminum or a carbon fiber reinforced composite are ideal materials because they provide a light and rigid tube. Alternatively, the outer wall is made of plastic material. One skilled in the art will appreciate that other materials providing similar properties may be used.

So that the diameter of the handle 20 is not too large for the user, the thickness of the outer wall 200 is preferably less than 2 mm and more preferably less than 1 mm. The ideal thickness is approximately 0.7 mm. The presence of a relatively thin outer wall 200 of the handle 20 also reduces the weight of the product.

When using a high-speed electric motor, noise is produced at high frequencies, some of which can irritate the human ear. However, this creates an advantage, since it is possible to more effectively reduce higher frequencies.

The ideal handle diameter is 20-60 mm and preferably 30-50 mm. Most preferably, the diameter is 35–42 mm. To minimize noise and obtain a handle with proper grip, the authors of the utility model used a combination of materials in handle 20. First of all, an outer layer 200 is provided, which is rigid as well as thin, so that the noise inside the handle 20 can be minimized using a damping medium, namely sound absorbing material 270, by maximizing the thickness of the sound absorbing material 270 inside the handle 20. Ideally case, to reduce noise with higher frequencies (approximately 1.8 - 2 kHz) produced by a high-speed electric motor, sound-absorbing material 270 or a damping medium with a thickness of at least m is required Here, 6 mm.

As shown in FIG. 7, the length of the sound-absorbing material 270 is also important. Ideally, sound-absorbing material 270 is provided both before and after the electric motor 70; this is due to the fact that the electric motor generates noise when the medium enters the electric motor and when the medium exits the electric motor.

In FIG. 10 shows a graph of the noise level produced by a high-speed electric motor inside the handle 20 as a function of the distance of the fan assembly 70 from the inlet 40. In general, the longer the sound absorbing material is, the more noise is reduced, while there is a limitation on the possible length of the product. Thus, for a hair dryer containing an electric motor in the handle 20, there is an optimal position of the electric motor within the length of the handle in relation to the noise level. The longer the length of the inlet silencer, the more noise is reduced, and, as can be seen in the graph, when the electric motor moves from the inlet along the x axis, the noise level 280 at the inlet decreases. However, for a given length l _{h of the} handle, a longer length of the intake silencer S _I corresponds to a shorter length of the exhaust silencer S _O.

Regarding the exhaust silencer S _O , if the electric motor is located at the inlet (zero value along the x axis), the noise level at the exhaust outlet 282 for the exhaust silencer S _O for a given length l _{h of the} handle is minimized, and when the electric motor moves along the handle the length of the exhaust silencer S _O decreases and noise reduction decreases, therefore the sound pressure level increases. Therefore, there is an optimum distance of the motor from the inlet. In the apparatus for drying hair with reinforcement, where the main channel 400 of the flowing medium extends from the handle 20 to the housing 30, it is provided to change the size and shape of the main channel of the flowing medium from the section 400a inside the handle having a circular cross section to the section 400b inside the case having an annular or toroidal section. For this reason, the intake and exhaust silencers inside the handle are not equivalent in terms of sound absorption, since part of the noise generated by the medium exiting the electric motor is attenuated by the medium passing into the housing 30.

The combined power of 284 noise from both the intake silencer S _I and the exhaust silencer S _O represents the amount of compression in the graph, which first decreases when the electric motor moves from the intake and reaches the corresponding value where the noise levels of the intake silencer S _I and the silencer intersect S _O , and then increases again.

The total power of 288 noise with respect to the hair dryer is the sum of the compression value 284 and the gain value 286, which is the noise value in the body 30 of the hair dryer, and this value does not depend on the position of the engine inside the handle 20. For a specific device 10 for Drying hair The optimum size of the intake silencer S _I is 70 - 100 mm. However, if, for example, any of the characteristics changes, which include the speed of the electric motor, the diameter of the handle or the characteristics of the inlet, this value will change.

Preferably, the length of the exhaust silencer S _O from the end 70b of the fan assembly 70 downstream to the end 22 of the downstream handle 20 is up to 100 mm. Preferably, the length of the intake silencer S _I from the end 70a of the upstream fan assembly 70 to the end 40b of the upstream intake 40 is 10 to 200 mm. Preferably, the ratio between the intake silencer S _I and the exhaust silencer S _{O is} greater than 1.2. In a hair dryer 10 having a constant handle diameter 20, this ratio should preferably be greater than 0.1.

With reference to FIG. 5, 11a – 11d, the hair dryer 10 has a ratio between the diameter d _{a of the} outer wall 360 of the housing 30 and the diameter d _{b of the} inner duct 310. The ratio d _b : d _{a is} preferably 0.49–0.6 in the hair dryer 10 having a handle 20 with a constant diameter, as shown in FIG. 11c and 11d. The ratio d _b : d _{a is} preferably 0.4–0.9 in the hair dryer 130 having a handle 132 with a variable or varying diameter, as shown in FIG. 11a and 11b.

With reference to FIG. 12, there is a relationship between the length Lx of the housing 30 from the fluid inlet 320 to the edge 202 of the handle 20 upstream and the length Lz of the housing 30 from the edge 204 of the handle 20 downstream to the medium outlet 340 at the end of the housing 30 downstream. Ideally, Lz≤40 mm and Lx≤20 mm. Preferably 2Lx = Lz.

With reference to FIG. 13a and 13b, the hair dryer 132, 134 has a ratio between the length l _{2 of the} body 30 and the diameter d _{h of the} handle 20. The ratio l ₂ : d _{h is} preferably 1.9–2.5 in the hair dryer 10 having a constant diameter handles 20. The ratio of l ₂ : d _{h is} preferably 1.9–2.5 in the hair dryer 160, 162 having a variable or varying diameter of the handle 164, as shown in FIG. 13c and 13d.

With reference to FIG. 14a and 14b, the hair dryer 136, 138 has a relationship between the diameter d _{a of the} outer wall 360 of the body 30 and the diameter d _{h of the} handle 20. The ratio d _b : d _{h is} preferably 1.6-3.4 in the hair dryer 10, having a handle 20 with a constant diameter.

With reference to FIG. 15a to 15c, the hair dryer 140 and 142 have a relationship between the length l _{2 of the} body 30 and the diameter d _{a of the} body 30. The ratio l ₂ : d _{a is} preferably 1.1-1.6 in the hair dryer 10 containing the unit 70 the fan in the handle 20. As for the drying device 144, where the heater 80 is located in the housing 30 and the fan assembly 70 is located in the handle 20, as shown in FIG. 15c, the ratio of l ₂ : d _{a is} preferably 0.8-1.6.

With reference to FIG. 16a to 16c, the hair drying apparatuses 146, 148 have a ratio between the length l _{2 of the} body 30 and the diameter d _{b of the} internal duct 310. The ratio l ₂ : d _{b is} preferably 1.8-3.4. With reference to FIG. 16d – 16f for appliances 150, 152, where a heater 80 is located in the housing 30 and a fan assembly 70 is located in the handle 20 and the ratio l ₂ : d _{b is} preferably 1–3.4.

Another distinguishing feature of the present utility model is that the flow in the main flow channel 400b in the housing 30 is 90 ° to the flow in the main flow channel 400a in the handle 20. The main flow of the flow inside the housing 30 is parallel to the medium that flows through flow channel 300.

With reference to FIG. 2, 3b and 9, the internal duct 310 comprises a generally tubular portion 312 extending from the fluid outlet 340 to the fluid inlet 320, and a generally conical portion 314 that forms a side wall 350 connecting the generally tubular portion 312 and the outer wall 360 of the housing 30.

The side wall 352 may be perpendicular to the outer wall 360, as shown in FIG. 17a. In fact, a separate side wall 350, 352 may not be provided, and the internal duct 354 may extend from the medium inlet 320 in the form of a cylinder with a gradually decreasing diameter to the outlet of the medium 340 in the form of a truncated cone.

As shown in FIG. 18a, the inner duct 354a extends from the outer wall 360 at the first end 32 and bends toward the tube forming an annular duct at the second end 34. The shape formed by the inner duct 354a is funnel-shaped. In FIG. 18b shows an internal duct 354b similar to that of FIG. 18a, however, the conical portion 358 of the inner duct 354b is shorter, creating a steeper slope toward the fluid inlet 320.

The gradual bending of the internal duct creates advantages in that as a result of less turbulence created when the medium enters the flowing medium channel at the inlet of the medium, noise is reduced. The presence of a curved side wall is advantageous from the point of view of acoustics, since the flow captured in the channel 300 of the flowing medium does not collide with an acute angle, which would create swirling movements and increase the generation of noise. The side wall passes into the tubular part of the internal duct 310.

In FIG. 18c shows a combination of the internal duct 354a of FIG. 18a and the flared hole 354c. The inner duct extends 362 from the first end 32 to the transition point 364, where a cylinder with a gradually decreasing diameter increases slightly in diameter to the second end 34. This expansion of the inner duct increases the entrainment of the medium into the fluid inlet 320.

In FIG. 18d shows a combination of the cone portion 358 of FIG. 18b and the expanding inner duct 354d. Due to the shorter tapered portion of the internal duct 354d, the bell may have a larger size.

In fact, the angle β between the outer wall 360 and the inner duct 350, 354a, 354b, 354c and 354d may be 1 to 90 °.

As shown in particular in FIG. 18c and 18d, the radius r between the conical portion 358, 362 and the tubular portion 312 of the inner duct 354d, 354c may vary. This radius is preferably 0.5-50 mm.

Alternatively, the inner duct 310 may increase in diameter from the inner wall 366 to the outlet 340 of the medium, as shown in FIG. 17b and 17c. This is advantageous because entrained flow through the flow path 300 increases. Thus, the total emission of the medium from the medium outlet 340 and the main medium outlet 440 is increased, and the fan assembly can operate at a lower rotational speed to provide equivalent overall performance, reducing the noise level of the product. An increase in the diameter of the internal duct 310 is more clearly shown in FIG. 17, and increases grip through the internal duct 310.

As shown in FIG. 7, the length of the sound-absorbing material inside the handle 20 may vary. Preferably, the length of the sound-absorbing material S _I at the inlet from the end 40b of the inlet 40 downstream to the end 70a of the upstream fan assembly 70 is 10-200 mm.

The front portion 38 (FIG. 2) of the hair dryer may have various bevels 372, 374, 376, as shown in FIG. 1, 2, 6, 19a and 19b, with the front bevel 372, 374, 376 being formed by changing the diameter of the outer wall 360 of the housing 30. The diameter decreases toward the center AA of the outer wall 360. The front bevel 372, 374, 376 affects the external grip 490 outside the hair dryer due to the movement of the medium from the main outlet 440. The blunt front side restricts both the flow for external gripping 490 and the flow through the channel 300 of the flowing medium. Ideally, a bevel of 30 ° is selected, as shown in FIG. 19a, up to 60 °, as shown in FIG. 19b. Preferably, a front bevel of 35-55 ° is provided, and more preferably a front bevel of 45 °, as this provides an acceptable external grip value of 490.

The direction of flow coming from the main release of the medium is variable and depends on the required performance. In FIG. 20a, 20b and 20c show various ventilation openings for the main medium. With reference to FIG. 20a, the primary media outlet 440 has a first 442 and a second 444 substantially parallel surfaces defining an outer annular and an inner annular restriction for the main media outlet 440, respectively. The first 442 and second 444 are essentially parallel surfaces, in addition, parallel to the inner duct 310. This arrangement creates a balance between the externally entrained stream 490 and the internally entrained stream 492, namely with respect to drawing the flowing medium into the channel 300.

In FIG. 20b, the main outlet 440a of the medium is directed toward the center of the outer wall 360 of the housing 30. In this example, both the first 446 and the second 448 of the surface that define the main outlet 440a of the medium are substantially parallel to each other but inclined to the inner duct 310. The main outlet 440a of the medium is directed to the inner duct 310 and to the center of the outer casing 360. The medium 494, which exits the main outlet 440a of the medium, is directed to the medium emitted from the outlet 340 of the medium, as well as the medium 490 captured from the outside. This creates a more concentrated outlet from device for drying hair, since the whole medium is directed to the captured inside the medium flowing through the internal duct 310, as a result of which the device for drying hair will act more efficiently, since the stream of medium emitted from the device for drying hair, is concentrated on a smaller cross-sectional area. Such an arrangement will provide a relatively larger trapped external flow 490 and a relatively smaller trapped internal flow in the internal duct 310 compared to the non-tilted example, as described with reference to FIG. 20a.

In FIG. 20c, the main outlet 440b of the medium is directed from the center of the outer wall 360 of the housing 30. In this example, both the first 450 and the second 452 surfaces that define the main outlet 440b of the medium are substantially parallel to each other but inclined from the internal duct 310. The main outlet 440b of the medium is directed to the outer wall 360. The medium 496, which exits from the main outlet 440b of the medium, is directed from the medium emitted from the outlet 340 of the medium to the environment 490 captured from the outside. This creates a more diffuse outlet from the hair dryer, since the whole medium is is directed outward, and thus, the hair dryer will work less efficiently, since the stream of fluid emitted from the hair dryer extends over a larger cross-sectional area. This arrangement will provide a relatively smaller capture external flow 490 and a relatively larger capture internal flow in the internal duct 310 compared to the non-tilt example, as described with reference to FIG. 20a.

In FIG. 21 shows the easy accessibility of the control buttons of the device 10 for drying hair and the ergonomic advantage of the location of the control buttons 64 (see FIG. 2) on an inclined surface of the body of the device for drying hair. When the hair dryer is normally gripped by the hand 500, the thumb will be positioned around the handle, forming a whole or partial circle with the index finger 502. In the present hair dryer 10, the thumb 504 can be gripped in a conventional manner, but the thumb can also be used to changing settings, such as temperature and / or flow rate through the hair dryer, via control buttons 64 located on the side wall 350, which forms part of the medium inlet 320 at the back of the product. Thus, without adjusting the grip, it is possible, except for moving the thumb radially from the handle 20 to the side wall 350, the user can change the settings of the device 10 for drying hair. The side wall 350 is preferably inclined to the outer wall 360 of the housing 30. This angle γ is ideally 1–90 ° and preferably 30-60 °. Most preferred is an angle γ of 45 °.

In FIG. 22 is a graph of a velocity profile from the beginning to the end of the hair dryer 10. At the inlet 40 of the medium, the medium entering the inlet 40 of the medium has a relatively low speed 402, and when the medium passes through the inlet silencer, the speed 404 increases as the cross-sectional area inside the handle 20 decreases. In addition, when the medium enters the fan assembly, the speed 406 increases again due to further narrowing of the flowing medium channel 400 through the electric motor and the fan wheel of the fan assembly 70 in front of the fan assembly 70, and the speed 408 decreases as the medium flows through the exhaust silencer, since the flowing duct environment again becomes less narrow. The minimum speed 410 is achieved when the medium passes from the handle 20 into the body 30 of the device 10 for drying hair. This is due to the fact that the housing 30 has a larger cross-sectional area compared to the handle and acts as a pressure chamber, which is filled with medium, slowing down the movement of the medium. Inside the hull, speed 410 is similar to intake speed 402. When the medium passes through the heater 80, the speed 412 increases slightly, since the heating element provides a slight decrease in the flow of the medium. As the medium approaches the main outlet 440 of the medium, the cross-sectional area inside the housing 30 decreases to an annular space that limits the main outlet

440 of the medium, and the speed inside the housing increases to a maximum speed of 414 at the main release 440 of the medium.

Slowing down when the medium moves from the fan assembly 70 to the heater 80 has several advantages: the housing 30 acts like a pressure chamber that stabilizes the flow when it moves from the circular section 400a inside the handle 20 to the circular section 400b in the housing 30, which slows down the movement of the medium and provides a more uniform flow through the heater 80, so the speed and turbulence are reduced, the noise produced by the device for drying hair is reduced, and a more uniform application of heat is provided around the narrow annular space which forms a major release 440 medium.

The main reason for reducing the speed from speed 406 in the fan assembly to speed 412 in the heater is that the cross-sectional area of the flowing medium channel changes from the area A1 in the round section 400a inside the handle to the area A2 in the ring section 400b in the case 30, as shown schematically in FIG. 22b, with A2> A1.

Although the outer wall 200 has been described as a wall made of rolled metal sheet, alternative manufacturing methods and materials may be used; this includes, without exception, an extruded tube and a tube made by extrusion / molding of plastic, or a tube made of a composite material, such as a tube reinforced with carbon fiber.

The utility model has been described in detail with reference to a device for drying hair, however, it is suitable for any electrical appliance that draws in the medium and directs the outgoing flow of the medium from this electrical appliance.

The above electrical appliance can be used with or without a heater; the action of the outgoing medium flow at high speed has a drying effect.

The medium flowing through the appliance is generally air, but may be another combination of gases or gas and may include additives to improve the performance of the appliance or the effect that the appliance has on the object, while the power of the appliance is directed to drying the hair or styling .

Claims (13)

1. A device for drying hair, containing the main channel of the medium flowing from the main inlet of the medium to the main outlet of the medium, a fan assembly for drawing the primary medium into the main channel of the medium, a heater for heating the primary medium in the main channel of the medium, the cross-sectional area the main medium flow channel near the heater is larger than near the fan assembly, and the primary medium flowing through the heater has a lower speed than the primary medium flowing through the valve assembly ora, and the velocity of the primary medium increases from the primary inlet fluid to fan assembly by reducing the sectional area of the primary inlet fluid to the fan assembly. 2. The device for drying hair according to claim 1, wherein the heater is located downstream of the fan assembly. 3. The device for drying hair according to paragraphs. 1 or 2, in which the cross-sectional area of the main flow channel of the medium varies along the main flow channel of the medium. 4. The device for drying hair according to claim 1, comprising a handle in which the main inlet of the medium is located. 5. The device for drying hair according to claim 4, comprising a housing, wherein the main outlet of the medium is made in the housing, and the main channel of the current medium extends inside the handle from the main inlet of the medium to the housing. 6. The device for drying hair according to claim 4, wherein the fan assembly is located in the handle. 7. The device for drying hair according to claim 4 or 6, in which the handle is essentially perpendicular to the body. 8. The device for drying hair according to claim 7, in which the main channel of the current medium extends in the first direction in the handle and in the second direction in the body. 9. The hair dryer according to claim 8, wherein the first direction is substantially perpendicular to the second direction. 10. The device for drying hair according to claim 1, wherein the primary medium flowing through the main outlet of the medium has a higher speed than the primary medium flowing through the heater. 11. The device for drying hair according to claim 5, wherein the primary medium flowing into the main outlet of the medium has a speed similar to that of the primary medium flowing through the heater. 12. The device for drying hair according to claim 11, in which the speed of the primary medium decreases from the fan assembly to the housing. 13. The device for drying hair according to claim 1, wherein the fan assembly comprises a high-speed electric motor.

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