A hair dryer

Abstract

The present invention relates to the field of household appliances. In order to solve the technical problem in the prior art that the heat of the heating unit is not dissipated in time and is prone to turn red, a hair dryer is provided, which includes a housing, a handle assembly connected to the housing, a fan unit, a heating unit, an air inlet and an air outlet; the fan unit is used for sucking air flow to enter the hair dryer from the air inlet and blowing it out from the air outlet to form a main air duct, and the heating unit is used for heating the air flow; the fan unit includes a fan blade and a motor for driving the fan blade to rotate; wherein, the main air duct includes an axial section extending along the axis direction of the housing, the heating unit is arranged in the axial section, the heating unit includes a notched cylinder, the notched cylinder has a notch extending along its axis direction, and the notched cylinder and the cylindrical wall inside the housing define the axial section. The probability of the heating wire turning red is reduced, and it is safer to use.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and particularly to a hair dryer. Background Art

[0002] In the prior art, a hair dryer includes a fan unit, a heating unit, a housing, and a handle assembly. The handle assembly is connected to the housing. The fan unit is disposed inside the handle assembly or the housing, and the heating unit is disposed inside the housing. The heating unit sucks air flow into the housing from an air inlet provided on the handle assembly or an air inlet provided on the housing, and the heating unit is used to heat the air flow. If the heat generated by the heating unit is not dissipated in time, it will cause the heating unit to turn red and result in a safety accident. Summary of the Invention

[0003] In order to solve the problems in the prior art, the present invention provides a hair dryer with safe use.

[0004] The technical solution of the present invention is as follows:

[0005] A hair dryer includes a housing, a handle assembly connected to the housing, a fan unit, a heating unit, an air inlet, and an air outlet;

[0006] The fan unit is used to suck air flow into the hair dryer from the air inlet and blow it out from the air outlet to form a main air duct, and the heating unit is used to heat the air flow;

[0007] The fan unit includes a fan blade and a motor for driving the fan blade to rotate;

[0008] Wherein, the main air duct includes an axial section extending along the axis direction of the housing, the heating unit is disposed in the axial section, the heating unit includes a notched cylinder, the notched cylinder has a notch extending along its axis direction, and the notched cylinder and the cylindrical wall inside the housing define the axial section.

[0009] The advantage is that through the setting of the notched cylinder, the air flow can be temporarily gathered inside the housing, so that the air flow has enough time to transfer heat with the heating unit, and then is blown out from the air outlet under the drive of other air flows, reducing the probability of the heating wire turning red and making the use safer.

[0010] Preferably, the ratio of the length of the notch to the length of the notched cylinder is not less than 1 / 2. The advantage is that an appropriate air storage area is formed to enable the air volume in this part to exchange heat with the heating unit. When the ratio of the two lengths is less than 1 / 2, the stored air volume is small and the heat exchange effect is not obvious.

[0011] Preferably, the projection of the notch along the direction perpendicular to the axis of the notched cylinder has a maximum width A perpendicular to the axial direction of the notched cylinder, and the projection of the notched cylinder along the direction perpendicular to the axis of the notched cylinder has a maximum width D perpendicular to the axial direction of the notched cylinder, and 0.1 ≤ A / D ≤ 1.

[0012] The advantage is that it can buffer the air volume and air pressure at the moment the hair dryer is started, reduce the air volume loss, form an appropriate air storage area, and allow this part of the air volume to exchange heat with the heating unit; when A / D>1, the gap is too large, causing a large amount of airflow to accumulate in the outer shell and unable to be blown out from the air outlet in time, resulting in serious air volume loss, and the airflow accumulated in the outer shell will cause the heat generated by the heating unit to be unable to dissipate in time, causing the heating unit to turn red and cause a safety accident; when A / D>0.1, the gap is too small, and the buffering effect of the air volume and air pressure at the moment the hair dryer is started is not obvious, and the heat exchange effect is not obvious.

[0013] Preferably, the heating unit further comprises a plurality of mica sheets mounted on the notched cylinder and a heating wire wound around the plurality of mica sheets, wherein the plurality of mica sheets are provided on at least two sides of the notch. This has the advantage of improving the installation reliability of the mica sheets and preventing the mica sheets from becoming dislodged, thereby increasing wind resistance and causing air volume loss.

[0014] Preferably, the heating wire is wound around a full circle, which has the advantage of increasing the heating power; or the heating wire is only wound above the mounting bracket, and the gap is left open, which reduces the weight of the heating unit.

[0015] Preferably, at least one of the plurality of mica sheets is disposed corresponding to the notch, and the mica sheet has a suspended end facing the notch and extending axially along the mounting bracket, thereby supporting the heating wire and preventing deformation of the heating wire at the notch.

[0016] Preferably, the plurality of mica sheets are evenly spaced along the axial direction of the notched cylinder. This has the advantage of supporting the heating wire, making the heating wire evenly stressed, and preventing the loss of air volume caused by wind resistance due to deformation of the heating wire.

[0017] Preferably, the notched tube is a ceramic heating device, which has the advantages of long service life, easy installation, small wind resistance, and reduced air volume and wind pressure loss.

[0018] Preferably, the fan unit is disposed within the handle assembly, and an air inlet is provided on the cylindrical wall. Airflow within the handle assembly enters the housing through the air inlet, and the notch is staggered with the air inlet. This advantageously allows airflow in the axial section to be blown out of the air outlet along the confines of the cylindrical wall and the notch, resulting in a shorter path and minimal loss of air volume and pressure. This prevents airflow from accumulating within the housing, preventing hot air from being promptly blown out of the air outlet, causing the heating unit to glow red and potentially leading to safety accidents.

[0019] Preferably, the notched tube is provided with a perforation arranged opposite to the air flow inlet, and the air flow enters the interior of the notched tube through the perforation. The advantage is that the flow of air at the notch is accelerated, so that it is blown out from the air outlet and the heat of the heating unit is promptly dissipated. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the hair dryer according to the present invention.

[0021] Figure 2 In one example according to the present invention Figure 1 The cross-section indicated by S in Figure 1 .

[0022] Figure 3 In another example according to the present invention Figure 1 The cross-section indicated by S in Figure 2 .

[0023] Figure 4 In another example according to the present invention Figure 1 The cross-section indicated by S in Figure 3 .

[0024] Figure 5 This is a schematic diagram of the structure of the notched cylinder in one example according to the present invention.

[0025] Figure 6 This is a schematic diagram of the structure of the notched cylinder from another angle according to the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the notched cylinder from yet another angle according to the present invention.

[0027] Figure 8 This is a schematic diagram of the structure of the first air outlet according to the present invention.

[0028] Figure 9 This is a schematic diagram of the structure of the first air outlet from another angle according to the present invention.

[0029] Figure 10 This is a schematic diagram of another structure of the notched cylinder according to the present invention.

[0030] Figure 11 This is a schematic diagram of yet another structure of the notched cylinder according to the present invention.

[0031] Figure 12 This is a schematic diagram of still another structure of the notched cylinder according to the present invention.

[0032] Figure 13 This is a schematic diagram of yet another structure of the first air outlet according to the present invention.

[0033] Figure 14 This is a schematic diagram of the structure of the non-closed duct according to the present invention.

[0034] Figure 15 This is a schematic diagram of the structure of the heating unit according to the present invention.

[0035] Figure 16 This is a schematic diagram of the structure of the auxiliary air duct according to the present invention.

[0036] Figure 17 This is a schematic structural diagram of the commutation passage described in the present invention.

[0037] Figure 18 This is another schematic structural diagram of the commutation passage.

[0038] The names of the components marked in the figure are as follows:

[0039] 1. Outer shell; 2. Handle assembly; 3. Heating unit; 301. Mica sheet; 3011. Suspended end; 302. Heating wire; 4. First air inlet; 5. First air outlet; 6. Axial section; 7. Notched cylinder; 701. Notch; 702. Perforation; 703. Second notch; 8. Cylindrical wall; 9. Communication port; 10. Air flow inlet; 11. Auxiliary air outlet; 12. Open end; 13. Open part; 14. Extension part; 15. Second notch; 16. Opening; 17. Air outlet member; 171. Blocking member; 172. Outer ring; 173. Rib; 18. Unenclosed duct; 19. First part; 20. Second part; 21. Blocking sheet; 22. Auxiliary air duct; 2201. Inlet section; 2202. Outlet section; 23. Second air outlet; 24. Mixed air flow outlet; 25. Commutation passage; 26. Air guiding inclined plane. Detailed implementation manners

[0040] The content of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] As Figures 1 to 6 shown, a hair dryer includes an outer shell 1, a handle assembly 2 connected to the outer shell 1, a fan unit, a heating unit 3, a first air inlet 4 and a first air outlet 5;

[0042] The fan unit is used to suck air flow into the hair dryer from the first air inlet 4 and blow it out from the first air outlet 5 to form a main air duct, and the heating unit 3 is used to heat the air flow;

[0043] The fan unit includes a fan blade and a motor for driving the fan blade to rotate (the fan unit is not shown in the figure);

[0044] Among them, the main air duct includes an axial section 6 extending along the axis direction of the outer shell 1, and a notched cylinder 7 with a notch 701 is provided inside the outer shell 1. The notched cylinder 7 and the cylindrical wall 8 inside the outer shell 1 define the axial section 6. The air flow direction of the axial section 6 is as indicated by the arrows in Figures 2, 3, and 4.

[0045] The fan unit can be arranged inside the housing 1. At this time, the first air inlet 4 is located at the rear end of the housing 1, and the first air outlet is located at the front end of the housing 1. The heating unit 3 is arranged inside the housing 1 and is located in the axial section 6. The fan unit can also be arranged inside the handle assembly 2. At this time, the first air inlet 4 is arranged on the handle assembly 2, and the first air inlet 4 is located below the fan unit. The air outlet is located at the front end of the housing 1. The heating unit 3 can be arranged inside the housing 1 and is located in the axial section 6, or can be arranged inside the handle assembly 2.

[0046] As Figure 2 , 4 shown, the cylindrical wall 8 inside the housing 1 can be the inner side wall of the housing 1. The axial section 6 of the main air duct is defined by the inner side wall of the housing 1 and the outer side wall of the notched cylinder 7. It can also be an inner cylinder arranged inside the housing 1, which is an independent component. The axial section 6 of the main air duct is defined by the inner side wall of the inner cylinder and the outer side wall of the notched cylinder 7.

[0047] Through the setting of the notch 701, at the moment when the hair dryer is started, part of the air flow in the axial section 6 converges and stores at the notch 701, or the air flow in the axial section 6 enters the internal space of the notched cylinder 7 through the notch 701. The remaining air flow extends along the space defined by the cylindrical wall 8 and the outer side wall of the notched cylinder 7 and is blown out from the air outlet. Therefore, the air volume and air pressure at the start moment are reduced. As the working time of the hair dryer increases, the air flow at the notch 701 or inside the notched cylinder 7 gradually converges until it is saturated, and the air volume and air pressure gradually increase and become constant, improving the user experience.

[0048] The following is a specific description of the notch 701. As Figure 5 shown, the notch 701 extends along the axis (b - b') direction of the notched cylinder 7. The ratio of the length of the notch 701 to the length of the notched cylinder 7 is not less than 1 / 2. The length of the notch 701 is L1, and the maximum length of the notched cylinder 7 is B. The notch 701 can start extending from the upstream end of the notched cylinder 7 or can extend from a position close to the upstream end. In the present invention, "upstream" refers to the position close to the rear end of the housing 1, and "downstream" refers to the position far from the rear end of the housing 1. In this example, the ratio of the length of the notch 701 to the length of the notched cylinder 7 is 0.95. The area of the air storage region is increased, effectively buffering the air volume and air pressure at the start moment of the motor.

[0049] The projection of the notch 701 perpendicular to the axis of the notch barrel 7 has a maximum width A perpendicular to the axial direction of the notch barrel 7, and the projection of the notch barrel 7 perpendicular to the axis of the notch barrel 7 has a maximum width D perpendicular to the axial direction of the notch barrel 7. 0.1≤A / D≤1 has the advantage of both buffering the air volume and pressure at the moment the hair dryer is started and reducing air volume loss. When A / D>1, the notch 701 is too large, causing a large amount of airflow to accumulate in the housing 1 and unable to be blown out from the air outlet in time, resulting in serious air volume loss. When A / D>0.1, the notch 701 is too small, and the buffering effect of the air volume and pressure at the moment the hair dryer is started is not obvious. Preferably, 0.1≤A / D≤0.5, in this example, A / D=0.3. Furthermore, the notch 701 extends along the axial direction of the notch tube 7, and the projection of the notch 701 perpendicular to the axis of the notch tube 7 also has a maximum length B parallel to the axial direction of the notch tube 7, A<B. The advantage is that it can not only buffer the air volume and air pressure at the moment the hair dryer is started, but also reduce the air volume loss.

[0050] like Figure 6 As shown, the center angle of the notch 701 is α, and 15°≤α≤180°. This has the advantage of buffering the air volume and pressure at the moment the hair dryer is started, while also ensuring that the loss of air pressure and air volume is not serious, allowing hair to be dried quickly. When α is less than 15°, the notch 701 is too small, and the buffering effect on the air volume and air pressure at the moment the hair dryer is started is not obvious. When α is greater than 180°, the notch 701 is too large, causing a large amount of airflow to accumulate in the housing 1 and not be blown out from the air outlet in time, resulting in a serious loss of air volume. Furthermore, 15°≤α≤90°, with 30°≤α≤60° being preferred. In this example, α=45°. The center angle α is the angle formed by the two longest lines from the two ends of the notch 701 to the axis of the notch barrel 7.

[0051] like Figure 2 、 3 As shown in and 4 , the handle assembly 2 and the housing 1 are connected to form a communication port 9, and the notch 701 extends to the upstream side of the communication port 9; alternatively, the handle assembly 2 and the housing 1 are connected to form a communication port 9, and the notch 701 extends to / over the downstream side of the communication port 9; or the notch 701 extends between the upstream and downstream sides of the communication port 9. In this example, the notch 701 exceeds the downstream side of the communication port 9.

[0052] The communication port 9 is staggered with the notch 701. "Staggered" in the present invention means that the edges of the notch 701 are staggered with the communication port 9, and the shortest distance from the notch tube 7 to the communication port 9 is the side wall of the notch tube 7. The notch 701 is located above the axis of the housing 1. Furthermore, the notch 701 is symmetrically arranged about the axis of the handle assembly 2.

[0053] like Figures 3 to 7As shown, the perforations 702 for allowing the air flow in the main air duct to enter the notched cylinder 7 are provided on the notched cylinder 7, and the projections of the perforations 702 and the notch 701 at least partially overlap. The projections of the axes of the perforations 702 and the notch 701 are parallel or coincident. Preferably, the projection of the notch 701 covers the projection of the perforations 702, that is, the projections of the axes of the perforations 702 and the notch 701 are coincident. In this example, the axis of the notch 701 is parallel to the axis (b-b’) of the notched cylinder 7.

[0054] Furthermore, as Figure 5 shown, the width of the perforations 702 can be the same as the width of the notch 701; alternatively, the width of the perforations 702 is less than the width of the notch 701; or the width of the perforations 702 is greater than the width of the notch 701. In this example, the width of the perforations 702 is less than the width of the notch 701. The width of the perforations 702 is K1, which refers to the maximum width projected in the direction perpendicular to the axis of the notched cylinder 7; the length of the perforations 702 is K2, which refers to the maximum length projected in the direction perpendicular to the axis of the notched cylinder 7 and parallel to the axis of the notched cylinder 7.

[0055] Furthermore, the length of the perforations 702 is less than the length of the notch 701, thereby reducing the loss of air volume and air pressure.

[0056] Furthermore, the projection of the center line (kc-kc’) of the perforations 702 is parallel or coincident with the projection of the center line of the handle assembly 2. It can be understood that the center line of the perforations 702 intersects with the projection of the center line of the handle assembly 2.

[0057] Furthermore, the perforations 702 are located below the axis of the cylindrical wall 8 and are oppositely arranged with respect to the air inlet 10.

[0058] Furthermore, an air flow guiding portion is provided on the notched cylinder 7, and the air flow guiding portion causes the air flow entering the notched cylinder 7 to extend along the axis direction of the housing 1. The air flow guiding portion is a wind guiding inclined surface 26 (not shown in the figure) located on the side wall of the notched cylinder 7. This inclined surface is preferably streamlined to reduce the air volume loss; it can also be a wind guiding inclined surface 26 located on other structural members inside the notched cylinder 7.

[0059] Furthermore, an auxiliary air outlet 11 is provided at the front end of the notched cylinder 7, and the air flow in the notched cylinder 7 is blown out from the auxiliary air outlet 11, which has the advantage of increasing the air volume and air pressure.

[0060] It can be understood that the perforations 702 for allowing the air flow in the main air duct to enter the notched cylinder 7 are provided on the notched cylinder 7, and the perforations 702 are located on the upstream side of the starting end of the notch 701 and are oppositely arranged with respect to each other.

[0061] When the fan unit is disposed within the handle assembly 2, the first air inlet 4 is disposed on the handle assembly 2 and is located below the fan unit. The main air duct includes a vertical section defined by the handle assembly 2. The connection between the handle assembly 2 and the housing 1 defines an airflow inlet 10 for airflow from the vertical section into the axial section 6. The notch 701 is staggered relative to the airflow inlet 10. The airflow inlet 10 is disposed on the cylindrical wall 8, corresponding to the connecting opening 9, and the centerline of the airflow inlet 10 is aligned with the centerline of the handle assembly 2. The notch 701 is located above the axis (a-a') of the cylindrical wall 8, allowing the majority of the airflow from the vertical section to enter the axial section 6 and be blown directly out of the air outlet, reducing air volume and pressure losses while also facilitating rapid hair drying. Furthermore, the notch 701 is disposed relative to the airflow inlet 10. Furthermore, the notched tube 7 is provided with a perforation 702 for allowing the airflow of the main air duct to enter the notched tube 7. The perforation 702 is located below the axis of the cylindrical wall 8 and is arranged opposite to the airflow inlet 10. The advantage is that the airflow in the vertical section enters the interior of the notched tube 7 through the shortest distance, thereby reducing the loss of air volume.

[0062] In another example, the notch 701 is a through hole 702 that allows airflow to enter the notch tube 7 .

[0063] like Figures 8 to 14 As shown, the first air outlet 5 is a non-closed gap located at the end of the axial section 6. In the present invention, the "non-closed gap" refers to a narrow gap in which the first air outlet 5 as a whole has two open ends 12, and the area formed between the open ends 12 (referred to as the open portion 13) is not used for blowing out the airflow from the axial section 6 of the main air duct. The non-closed gap can be a continuous gap for blowing out the airflow from the axial section 6 of the main air duct; or it can be a combination of multiple small gaps for blowing out the airflow from the axial section 6 of the main air duct (that is, it can be regarded as a continuous gap interrupted by a rib 173 in the middle to increase strength), and the open portion 13 is formed between the starting end of the first small gap and the end of the last small gap. The area between the open ends 12 can be solid or in other forms.

[0064] The advantage of making the first air outlet 5 a "non-closed slit" is that the wind pressure of the air flow blown out from the first air outlet 5 is relatively high. This part of the air flow drives the air flow in the open part 13 of the non-closed slit to flow, and the wind pressure of this air flow is relatively low. Outside the hair dryer, at a certain distance from the first air outlet 5 and before reaching the surface of the hair, the two air flows converge into one air flow, which appropriately reduces the wind pressure. When blowing long hair, it is not easy to blow the hair at too large an angle, making it messy during and after blowing; when the hair is short, the force applied to the hair roots is relatively small. When the user only needs to blow-dry the hair and does not need to style it, blowing in one direction for a long time will not change the original direction of the hair roots, making the hair easier to manage after blowing.

[0065] As shown Figure 9 in the figure, the width of the non-closed gap is d, where 1 mm ≤ d ≤ 20 mm. This can not only increase the wind pressure but also result in a relatively large air volume per unit time. When d < 1 mm, the air volume per unit time is small, and more air accumulates inside the housing 1. When d > 20 mm, the airflow is not concentrated when blowing out from the first air outlet 5, and the hair drying efficiency is slow. Further, 5 mm ≤ d ≤ 10 mm, and preferably d = 8 mm. The width of the non-closed gap is d and the length is L, where 0.05 ≤ d / L ≤ 0.5. The advantage is that it takes into account both the air volume and the wind pressure. When d / L < 0.05, with a certain length L, the air volume per unit time is small, and more air accumulates inside the housing 1. With a certain width d, the overall volume of the machine will become larger, which is not aesthetically pleasing and not easy to store. When d / L > 0.5, with a certain length L, the air inside the housing 1 can quickly blow out from the first air outlet 5, but the wind pressure is small, which is not conducive to blowing dry wet hair. With a certain width d, it is not conducive to the air inside the housing 1 to blow out, causing the air to accumulate inside the housing 1 and resulting in a loss of air volume. The width d refers to the distance between the two points farthest from each other on the cross-section of the non-closed gap along the direction perpendicular to the center line of the non-closed gap. The length L refers to the length of the line connecting the centers of the starting end and the ending end of the non-closed gap. If the line between the two points is a curve, the length of the arc whose shape is close to the shape of the non-closed gap is L (not shown in the figure).

[0066] The non-closed gap has an opening part 13, and the central angle β of the opening part 13 satisfies 15° ≤ β ≤ 180°. The advantage is that it can not only reduce the wind pressure reaching the hair and allow the air to blow out of the housing 1 in time but also not cause a large loss of wind pressure. When β < 15°, the effect of reducing the wind pressure is not obvious, and the hair is easily blown messy. If blowing directly at the hair roots for a long time to dry the hair, it is easy to make the hair roots have an unwanted direction. When β > 180°, the first air outlet 5 is too small, which is easy to cause the air to accumulate inside the housing 1 and cannot be blown out from the first air outlet 5 in time, resulting in a loss of air volume. The central angle β refers to the angle formed by the lines connecting the two ends of the opening part 13 (i.e., the starting end and the ending end of the non-closed gap) to the center of the non-closed gap. If the two ends of the opening part 13 have a certain width or the shape of the ends is irregular, it is the angle formed by the two lines with the smallest length connecting the two ends to the center of the non-closed gap respectively. Further, 15° ≤ β ≤ 90°, and preferably β = 45°. The central angle β refers to the angle formed by the two longest lines from the open end 12 to the center line of the non-closed gap. The center line of the non-closed gap is the same as the axis of the notch 701 of the notch cylinder 7. The airflow part of the main air duct blows out from the opening part 13.

[0067] The width of the non-closed gap is d, and the projection of the opening portion 13 along the direction perpendicular to the center line of the non-closed gap has a maximum width d1, where 0.1 ≤ d / d1 ≤ 1. The advantage is that it can not only enable the opening portion 13 to play a role in reducing the overall wind pressure, but also enable the air flow in the main air duct to be blown out in time, preventing the air flow from accumulating inside the housing 1 and causing air volume loss. When d / d1 < 0.1, the opening portion 13 is too large, resulting in a large wind pressure loss, which is not conducive to spreading wet hair and reducing the drying efficiency. When d is too small, it is easy for the air flow to accumulate inside the housing 1 and cause air volume loss. When d / d1 > 1, the opening portion 13 is too small, and the effect of reducing the wind pressure is not obvious, and the hair is relatively messy after being dried. When d is too large, it is not conducive to increasing the wind pressure and spreading wet hair.

[0068] The opening portion 13 is located on one side of the center line of the non-closed gap. This situation indicates that the non-closed gap is arranged around its center line, and the center of the non-closed gap is on its inner side, so that the main air duct air flow blown out from the first air outlet 5 and the air flow at the opening portion 13 driven by this air flow form a complete circle. According to the distance between the first air outlet 5 and the hair when the user blows the hair, these two air flows will merge into one before reaching the hair, improving the hair blowing effect.

[0069] The opening portion 13 is located above the center line of the housing 1. According to the user's habit of holding the hair dryer during the hair drying process, the area below the center line of the housing 1 is the part that always plays a major role throughout the hair drying process. The air flow at the opening portion 13 is mainly driven by the main air duct air flow blown out from the first air outlet 5, and both the air volume and the wind pressure are relatively small. If the user is used to blowing the first air outlet 5 of the hair dryer close to the hair, then the two air flows will reach the hair surface before merging into one. The opening portion 13 being located above the center line of the housing 1 is conducive to blowing a larger wind pressure and more air flow towards the hair, achieving the purpose of quickly drying the hair.

[0070] Both ends of the opening portion 13 are located on both sides of the center line of the handle assembly 2. The two ends of the opening portion 13 can be symmetric or asymmetric with respect to both sides of the center line of the handle assembly 2.

[0071] As Figure 9As shown, the non-closed projection is formed by connecting multiple curves end to end, that is, the non-closed gap is defined by multiple components. Further, a notched cylinder 7 is provided inside the housing 1, the axial section 6 is defined by the notched cylinder 7 and the cylindrical wall 8 inside the housing 1, and the non-closed gap is defined by the notched cylinder 7 and the cylindrical wall 8. The notch 701 extends along the axis direction of the housing 1. The notch 701 can extend from the upstream end of the notched cylinder 7 to its downstream end, or can extend from the downstream end of the notched cylinder 7 to its upstream end. For an example of the non-closed gap, an extension 14 extending downward is provided on the cylindrical wall 8. The extension 14 closes a part of the gap between the notched cylinder 7 and the cylindrical wall 8 to form the non-closed gap. In one case, the gap between the notched cylinder 7 and the cylindrical wall 8 is annular, and the extension 14 closes a part of the annular gap to obtain the non-closed gap. The extension 14 abuts against the outer side wall of the notched cylinder 7, and the opening 13 is the shown extension 14. The non-closed gap is in a shape similar to a C shape, a U shape, etc.; in another case, as Figure 10 shown, the notch 701 is provided at the front end of the notched cylinder 7, and the extension 14 closes at least a part of the notch 701. The non-closed gap is in a shape similar to a C shape, a U shape, etc. Further, the notch 701 extends backward from the front end of the notched cylinder 7, and the ratio of the length of the notch 701 to the length of the notched cylinder 7 is not less than 1 / 2. The extension 14 closes the notch 701, so that the shape of the air flow in the axial section 6 before reaching the non-closed gap is substantially the same as it, and the air flow in the axial section 6 quickly blows out from the first air outlet 5 along the side walls of the extension 14, the side wall of the notched cylinder 7 and the limitation of the cylindrical wall 8. The air flow will not accumulate in the housing 1, reducing the air volume loss.

[0072] For another example, as Figure 11 , 12 shown, a second notch 15703701 spaced from the notch 701 is provided at the front end of the notched cylinder 7, and the extension 14 closes the second notch 15703701 to form the non-closed gap. The non-closed gap has an opening 13, and the opening 13 faces the same direction as the notch 701. The opening 13 is the second notch 15703701. Preferably, the opening 13 and the notch 701 are on the same axis. The advantage is to reduce the air volume loss.

[0073] For another example, as Figure 13 shown, an opening 16 is provided at the end of the housing 1, and an air outlet member 17 is provided in the opening 16. The air outlet member 17 includes a barrier member 171 in the middle and an outer ring 172 on the outside. The outer ring 172 and the barrier member 171 are connected by ribs 173. The non-closed gap is defined by the outer ring 172 and the barrier member 171. Alternatively, an inner cylinder is further provided inside the shown housing 1, and the above air outlet member 17 is installed on the inner cylinder.

[0074] In another example, a barrier member 171 is provided inside the cylindrical wall 8. The barrier member 171 and the cylindrical wall 8 are connected by ribs 173, and the non-closed gap is defined by the cylindrical wall 8 and the barrier member 171.

[0075] It can be understood that the airflow in the axial section 6 includes an annular airflow before reaching the non-closed gap, and this annular airflow blows out from the non-closed gap; in this case, an inner cylinder is provided inside the housing 1, and this annular airflow is defined by the outer sidewall of the inner cylinder and the cylindrical wall 8 inside the housing 1.

[0076] As Figure 14 shown, the projection of the non-closed gap is surrounded by a single closed curve, that is, the non-closed gap is defined by one member. More specifically, a non-closed duct 18 is provided inside the housing 1, and the airflow having the same shape as the non-closed gap is defined by the non-closed duct 18. The non-closed gap is located at the end of the non-closed duct 18, and the airflow in the axial section 6 includes an airflow having the same shape as it before reaching the non-closed gap, and this airflow blows out from the non-closed gap.

[0077] As Figures 1 to 15 shown, the heating unit 3 is arranged in the axial section 6. The heating unit 3 includes a notched cylinder 7, and the notched cylinder 7 has a notch 701 extending along its axis. The notched cylinder 7 and the cylindrical wall 8 inside the housing 1 define the axial section 6. By providing the notched cylinder 7, the airflow can be temporarily gathered inside the housing 1, so that the airflow has enough time to transfer heat with the heating unit 3, and then is blown out from the first air outlet 5 under the drive of other airflow, avoiding the heating wire 302 from turning red and making it safer to use.

[0078] In one example, the ratio of the length of the notch 701 to the length of the notched cylinder 7 is not less than 1 / 2, forming an air outlet area for heat exchange with the heating unit 3 to prevent the heating wire 302 from turning red. Further, the length of the notch 701 is not less than 2 / 3 of the length of the notched cylinder 7. The heating unit 3 further includes a plurality of mica sheets 301 mounted on the notched cylinder 7 and a heating wire 302 wound around the plurality of mica sheets 301. The plurality of mica sheets 301 are at least provided on both sides of the notch 701; further, the plurality of mica sheets 301 are evenly spaced along the axis of the notched cylinder 7. The heating wire 302 winds around in a complete circle; or the heating wire 302 is only wound above the mounting bracket and the notch 701 is open.

[0079] In another example, at least one of the multiple mica sheets 301 is positioned corresponding to the notch 701, and the mica sheet 301 has a free-standing end 3011 extending axially toward the notch 701 and along the mounting bracket. In this case, a structure for securing the mica sheet 301 is provided at the location of the notch barrel 7 corresponding to the notch 701. Especially when the notch 701 is long, retaining slots for securing the mica sheet 301 are provided at both ends of the notch barrel 7. The mica sheet 301 extends in the same direction as the notch 701 and is positioned directly above the notch 701.

[0080] In another example, the notched cylinder 7 is a ceramic heating device.

[0081] Furthermore, the fan unit is arranged in the handle assembly 2, and an air flow inlet 10 is provided on the cylindrical wall 8. The air flow in the handle assembly 2 enters the housing 1 through the air flow inlet 10, and the notch 701 is staggered with the air flow inlet 10.

[0082] Furthermore, the notch tube 7 is provided with a perforation 702 arranged opposite to the air flow inlet 10. The airflow enters the interior of the notch tube 7 through the perforation 702. The airflow can promote the flow of air at the notch 701. The airflow gathered at the notch 701 is blown out from the first air outlet 5 to take away heat.

[0083] The present invention also relates to a heating unit 3 of a hair dryer, comprising a plurality of mica sheets 301 and a heating wire 302 wound around the mica sheets 301. The heating unit 3 further comprises a mounting bracket having a hollow passage, the plurality of mica sheets 301 being mounted on the mounting bracket, the mounting bracket having a notch 701 extending axially thereof, the plurality of mica sheets 301 being disposed at least on either side of the notch 701. In one example, the hollow mounting bracket is the notch barrel 7 described above.

[0084] The mounting bracket also includes a second portion 20 extending outwardly from the rear end of the first portion 19 along the circumference of the first portion 19. The rear end of the mica sheet 301 abuts against the inner side of the second portion 20. This improves the securement of the mica sheet 301. The first portion 19 is a notched cylinder 7, and the second portion 20 is annular, circular, U-shaped, or C-shaped.

[0085] The rear end of the mica sheet 301 has a slot, and the slot abuts against the periphery of the second portion 20 .

[0086] A barrier sheet 21 is provided in the hollow channel, and the barrier sheet 21 is provided near the front end of the hollow channel. The advantage is that when the length of the gap 701 is long, the barrier sheet 21 improves the strength of the hollow mounting bracket, preventing the mounting bracket from deforming, resulting in greater wind resistance to the airflow in the axial section 6 and causing air volume loss.

[0087] As shown Figures 1 to 18 in the figure, a hair dryer includes a housing 1, a handle assembly 2 connected to the housing 1, a fan unit, a heating unit 3, a first air inlet 4 and a first air outlet 5;

[0088] The fan unit is used to suck air flow into the hair dryer from the first air inlet 4 and blow it out from the first air outlet 5 to form a main air duct, and the heating unit 3 is used to heat the air flow;

[0089] The fan unit includes a fan blade and a motor for driving the fan blade to rotate;

[0090] The hair dryer further includes an auxiliary air duct 22 extending around the axial section 6. At least part of the air flow in the auxiliary air duct 22 is mixed with at least part of the air flow in the axial section 6 and then blown out inside the housing 1. If the two air flows are blown out independently first and mixed outside the housing 1, then when the first air outlet 5 is not far enough from the hair surface, the two air flows reach the hair without being mixed, and the intensity felt in the same area will be different. Due to the difference in the air volume and wind force of the two air flows, some hair in the same area will be dried while some will not; the air flow in the auxiliary air duct 22 is cold air flow and the air flow in the axial section 6 is hot air flow. The two are mixed and then blown out to prevent the generation of hot spots, so that when blowing on the same area of the scalp for a long time, it will not feel hot. When the air flows in the auxiliary air duct 22 are of the same nature, by mixing the two air flows inside the housing 1, no matter how far the first air outlet 5 is, the intensity felt in the same area is not much different, and the hair in the same area will be dried simultaneously. Just move the hair dryer to blow other areas of the hair, or do not dry it first according to personal habits and blow back and forth. The hair in the whole area will be dried almost simultaneously, and the dried hair will not be blown repeatedly, and the proportion of wet hair will not be much, reducing the probability of damage to the hair.

[0091] As shown Figure 16 and 17 in the figure, the auxiliary air duct 22 includes an inlet section 2201 and an outlet section 2202. At the inlet section 2201, the air flow in the axial section 6 and the air flow in the inlet section 2201 are independent of each other. In one example, the first air inlet 4 is provided at the rear end of the housing 1. An inner cylinder is provided inside the housing 1. The inner cylinder divides the air flow sucked into the housing 1 by the fan unit into the auxiliary air duct 22 and the main air duct (the axial section 6 of the main air duct in this example). The inlet section 2201 is defined by the outer side wall of the inner cylinder and the inner side wall of the housing 1. The axial section 6 is defined by the inner side wall of the inner cylinder. The air flows in the two air ducts are independent of each other first, and are mixed inside the housing 1 near the first air outlet 5 and then blown out from the same outlet. This same outlet can be the first air outlet 5 of the main air duct or other outlets provided additionally.

[0092] Further, the fan unit is disposed within the handle assembly 2, the first air inlet 4 is located on the handle assembly 2, and the rear end of the axial section 6 is sealed, which helps to reduce the wind pressure loss in the main air duct. Further, a second air inlet (not shown in the figure) of the auxiliary air duct 22 is provided at the rear end of the housing 1, and the first air inlet 4 is located downstream of the second air inlet.

[0093] In another example, the front end of the housing 1 includes a mixed air flow outlet 24. At least part of the air flow in the axial section 6 and at least part of the air flow in the auxiliary air duct 22 are mixed and blown out from the mixed air flow outlet 24, and part of the air flow in the axial section 6 is blown out from the first air outlet 5. The first air outlet 5 is located outside the mixed air flow outlet 24, and the first air outlet 5 is arranged around the mixed air flow outlet 24. The advantage is that in this case, the air flow blown out from the first air outlet 5 is in a ring shape or approximately in a ring shape. The ring-shaped air flow surrounds the air flow moving in a straight line, which can promote the air flow blown out from the first air outlet 5 to flow forward along the axis of the housing 1 to reach the hair surface. "Approximately in a ring shape" includes a ring formed by a plurality of spaced small outlets as a whole, or a ring with a notch 701 (such as a U-shaped or C-shaped) and other approximate shapes. Further, a second air outlet 23 is also provided at the front end of the housing 1, and part of the air flow in the auxiliary air duct 22 is blown out separately from the second air outlet 23. The second air outlet 23 is located outside the first air outlet 5, and the second air outlet 23 is arranged around the first air outlet 5. In this example, there are three air outlets in total. The air flow in the axial section 6 and the air flow in the auxiliary air duct 22 are each divided into two parts within the housing 1. Part of the air flow in the axial section 6 is mixed with part of the air flow in the auxiliary air duct 22 and blown out from the mixed air flow outlet 24, the other air flow in the axial section 6 is blown out from the first air outlet 5, and the other air flow in the auxiliary air duct 22 is blown out from the second air outlet 23.

[0094] In another example, the air flow in the auxiliary air duct 22 merges into the axial section 6 and is blown out from the first air outlet 5. In this case, there is only the first air outlet 5, and all the air flow in the auxiliary air duct 22 merges into the axial section 6; or a second air outlet 23 is further provided at the front end of the housing 1, part of the air flow in the auxiliary air duct 22 merges into the main air duct and is blown out from the first air outlet, and the remaining part of the air flow is blown out from the second air outlet 23.

[0095] Further, an inner cylinder separating the axial section 6 and the auxiliary air duct 22 is provided within the housing 1, and a channel for the air flow in the auxiliary air duct 22 to enter the axial section 6 is provided on the inner cylinder. When the heating unit 3 is disposed in the axial section 6, the inner cylinder plays a heat insulation role to prevent the housing 1 from overheating and getting hot after long-term hair drying.

[0096] The main air duct includes an axial section 6 extending along the axis direction of the housing 1. An inner cylinder is provided inside the housing 1. The axial section 6 is at least defined by the inner cylinder. The hair dryer further includes an auxiliary air duct 22 extending around the axial section 6. The auxiliary air duct 22 is defined by the inner cylinder and the housing 1. A commutation passage 25 is provided on the inner cylinder. The air flow of the auxiliary air duct 22 changes its direction through the commutation passage 25 and is blown out after being mixed with the air flow of the axial section 6. The commutation passage 25 is a passage provided on the inner cylinder.

[0097] A wind guiding inclined surface 26 for enabling the air flow of the auxiliary air duct 22 to enter the commutation passage 25 is provided on the inner cylinder. Through the arrangement of the wind guiding inclined surface 26, the air volume loss caused by the air flow entering the commutation passage 25 is reduced. The wind guiding inclined surface 26 extends from the upstream to the downstream of the housing 1 along the axis direction of the housing 1. The center line of the commutation passage 25 forms an angle with the center line of the axial section 6, and the angle is not greater than 90°. The advantage is that after the air flow changes its direction through the commutation passage 25, the acting force on the air flow blown out along the axial direction is reduced, and the wind force loss is reduced; when the angle is greater than 90°, the air flow passing through the commutation passage 25 generates an acting force opposite to the air flow flowing forward axially, reducing the wind force reaching the hair surface, which is not conducive to blowing dry wet hair and reduces the drying efficiency. Further, the angle is not less than 10°, enabling the air flow to achieve mixing through a shorter path, reducing the air volume loss. When the angle is less than 10°, in order to achieve the mixed air flow, it needs to pass through a longer path, which will cause air volume loss and reduce the mixing efficiency and wind speed. In this example, the angle formed by the center line of the commutation passage 25 and the center line of the axial section 6 is 90°; further, the angle formed by the wind guiding inclined surface 26 and the center line of the commutation passage 25 is γ, 10° ≤ γ ≤ 60°. The advantage is to guide the air flow into the commutation passage 25 and reduce the air volume loss caused by the air flow entering the commutation passage 25; when γ > 60°, air volume loss will occur at the corner of the wind guiding inclined surface 26 and the commutation passage 25; when γ < 10°, air volume loss is likely to occur when the air flow enters the commutation passage 25 through the wind guiding inclined surface 26; preferably, γ = 30° for the air flow of the wind guiding passage.

[0098] The air flow of the auxiliary air duct 22 changes its air flow direction through the commutation passage 25 and spatially crosses the air flow of the axial section 6. In this example, the commutation passage 25 has a certain length and width. The air flow in the commutation passage 25 is independent of the air flow in the axial section 6. More specifically, the air flow in the commutation passage 25 is independent of the air flow extending along its center line in the axial section 6.

[0099] The commutation passage 25 is defined by an extension portion 14 extending axially from the inner cylinder towards the outer shell 1, and the extension portion 14 straddles the first air outlet 5. In this example, at least part of the air flow in the auxiliary air duct 22 is mixed with the air flow in the main air duct through the commutation passage 25. The air flow in the axial section 6 is divided into two parts inside the outer shell 1, one of which is blown out from the first air outlet 5, and the other is blown out from the mixed air flow outlet 24 located inside the first air outlet 5 after being mixed with the air flow in the auxiliary air duct 22. Further, the heating unit 3 is arranged inside the inner cylinder. The heating unit 3 includes a mounting bracket having a hollow channel. The end of the mounting bracket defines the mixed air flow outlet 24. Part of the air flow in the auxiliary air duct 22 is mixed with the air flow in the axial section 6 and then blown out from the mixed air flow outlet 24. The first air inlet 4 is defined by the inner cylinder and the mounting bracket. Further, a notch 701 is provided on the mounting bracket, and the extension portion 14 blocks the notch 701.

[0100] A second air outlet 23 is further provided on the inner cylinder, and part of the air flow in the auxiliary air duct 22 is blown out from the second air outlet 23. The first air outlet 5 is located between the second air outlet 23 and the mixed air flow outlet 24. An annular ring is provided on the outer side of the inner cylinder. The annular ring is connected to the outer side wall of the inner cylinder through connecting ribs. The second air outlet 23 is annular; the second air outlet can also be defined by the sandwich between the inner cylinder and the outer shell.

[0101] In the present invention, the center line of the outer shell, the axis of the outer shell, the center line of the inner cylinder, the axis of the inner cylinder, the center line of the notch cylinder, and the axis of the notch cylinder are the same.

[0102] The above embodiments are only the optimized embodiments of the present invention, not all embodiments of the present invention. According to the principle of the present invention, those skilled in the art can make various deformations. As long as they do not depart from the spirit of the present invention, they should all fall within the scope defined by the claims of the present invention.

Claims

1. A hair dryer, comprising a housing, a handle assembly connected to the housing, a fan unit, a heating unit, an air inlet and an air outlet; the fan unit is used to suck air flow into the hair dryer from the air inlet and blow it out from the air outlet to form a main air duct, and the heating unit is used to heat the air flow; the fan unit includes a fan blade and a motor for driving the fan blade to rotate; characterized in that, The main air duct includes an axial section extending along the axial direction of the shell, and the heating unit is arranged in the axial section. The heating unit includes a notch tube, and the notch tube has a notch extending along its axial direction. The notch tube and the cylindrical wall inside the shell define the axial section; the heating unit also includes a plurality of mica sheets installed on the notch tube and a heating wire wound on the plurality of mica sheets, and the plurality of mica sheets are arranged at least on both sides of the notch.

2. The hair dryer according to claim 1, wherein, The ratio of the length of the notch to the length of the notch tube is not less than 1 / 2.

3. The hair dryer according to claim 1, wherein The projection of the notch perpendicular to the axis of the notch cylinder has a maximum width A perpendicular to the axial direction of the notch cylinder, and the projection of the notch cylinder perpendicular to the axis of the notch cylinder has a maximum width D perpendicular to the axial direction of the notch cylinder, 0.1≤A / D≤1.

4. The hair dryer according to claim 1, characterized in that, The heating wire is wound around a full circle; or the heating wire is only wound above the mounting bracket, and the gap is open.

5. The hair dryer according to claim 1, wherein, At least one of the plurality of mica sheets is arranged corresponding to the notch, and the mica sheet has a suspended end facing the notch and extending axially along the mounting bracket.

6. The hair dryer according to claim 1, wherein The multiple mica sheets are evenly spaced along the axial direction of the notched cylinder.

7. The hair dryer according to claim 2, characterized in that, The notched cylinder is a ceramic heating device.

8. The hair dryer according to any one of claims 1 to 7, characterized in that, The fan unit is arranged in the handle assembly, and an air flow inlet is provided on the cylindrical wall. The air flow in the handle assembly enters the shell through the air flow inlet, and the notch is staggered with the air flow inlet.

9. The hair dryer according to claim 8, characterized in that, The notched tube is provided with a through-hole arranged opposite to the air flow inlet, and the air flow enters the interior of the notched tube through the through-hole.

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