Electric hair drier

Abstract

The invention relates to the field of household appliances, and provides an electric hair drier in order to solve the problem that in the prior art, an electric hair drier is too large in air volume and air pressure at the starting moment and frightens a user, and the electric hair drier comprises a shell, a handle assembly connected with the shell, a fan unit, a heating unit, an air inlet and an air outlet; the fan unit is used for sucking airflow into the electric hair drier from the air inlet and blowing out the airflow from the air outlet to form a main air duct, and the heating unit is used for heating the airflow; the fan unit comprises fan blades and a motor for driving the fan blades to rotate; wherein the main air duct comprises an axial section extending in the axial direction of the shell, a notch barrel with a notch is arranged in the shell, the notch extends in the axial direction of the shell, and the axial section is limited by the notch barrel and a barrel-shaped wall in the shell. The air volume and the air pressure at the starting moment of the electric hair drier are small, psychological preparation is provided for a user, and then the air volume and the air pressure are gradually increased and tend to be constant, so that hair can be quickly dried.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of household appliances, in particular to a hair dryer. BACKGROUND

[0002] In the prior art, a hair dryer comprises a housing, a duct, a fan unit for drawing air into the housing and the duct, and an axial section extending between the housing and the duct, the air flow being substantially annular, which facilitates the rapid blowing of the air flow out of the hair dryer along the side walls of the housing and the duct.

[0003] However, in this way, the air flow drawn into the hair dryer by the fan unit is blown out rapidly after the hair dryer is powered on. If the position of the air outlet is directly opposite the face of a user during use, the air flow blown out by the hair dryer will hit the face, especially for a hair dryer with a large air volume and a large air pressure, which will cause the user to be startled and temporarily hold his or her breath under the action of the air flow. Alternatively, when the position of the air outlet is aligned with the hair (for a long-haired girl, the hair may be blown from the tips first) or the scalp, the air flow with a large air pressure will be blown to the hair or the scalp instantaneously after the hair dryer is powered on, causing the hair or the scalp to instantaneously bear a large force and causing discomfort. It is also relatively cumbersome to operate by first turning on a small air volume and then switching to a large air volume. SUMMARY

[0004] To solve the problems in the prior art, the present application provides a hair dryer capable of having a small air volume and air pressure at the instant of starting up at the same air volume, and gradually increasing and stabilizing the air volume and air pressure with the extension of the starting-up time, thereby providing a good user experience.

[0005] The technical solution of the present application is as follows: A hair dryer comprises 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 configured to draw air into the hair dryer from the air inlet and blow the air out of the air outlet to form a main air duct, and the heating unit is configured to heat the air. The fan unit comprises a fan blade and a motor configured to drive the fan blade to rotate. The main air duct comprises an axial section extending along the axis of the housing, and the housing is provided with a notched cylinder having a notch, the notch extending along the axis of the housing, and the notched cylinder and the cylindrical wall inside the housing defining the axial section.

[0006] The advantage is that the air flow of the axial section is converged at the gap by the setting of the gap cylinder, the air storage volume of the axial section is increased, at the moment of starting the hair dryer, the air flow is sucked into the axial section by the fan unit, part of the air flow is gradually converged at the gap or enters the inside of the gap cylinder through the gap, the rest of the air flow is blown out from the air outlet along the direction defined by the outer sidewall of the gap cylinder and the cylindrical wall, so that the air pressure and air volume are relatively small at the moment of starting the hair dryer; after the gap is filled with air flow or the inside space of the gap cylinder is filled after the hair dryer is started, the part of the air flow will be blown out from the air outlet under the driving of the rest of the air flow of the axial section, the air pressure and air volume are increased, and the air storage at the gap can balance the air volume and air pressure at the air outlet, so that the air volume and air pressure blown out from the air outlet are relatively constant.

[0007] Preferably, the gap extends from the upstream of the gap cylinder to the downstream thereof, and the ratio of the length of the gap to the length of the gap cylinder is not less than 1 / 2.

[0008] The advantage is that a proper air storage area is formed to buffer the air volume and air pressure at the moment of starting the hair dryer. When the ratio of the length of the gap to the length of the gap cylinder is less than 1 / 2, the buffering effect on the air volume and air pressure at the moment of starting the hair dryer is not obvious.

[0009] Preferably, a communication port is formed at the connection between the handle assembly and the shell to communicate the handle assembly and the shell, and the gap extends to the upstream side of the communication port.

[0010] The advantage is that the air volume and air pressure at the moment of starting the hair dryer can be buffered without losing much air volume and air pressure.

[0011] Preferably, a communication port is formed at the connection between the handle assembly and the shell to communicate the handle assembly and the shell, and the gap extends to the upstream side of the communication port.

[0012] The advantage is that the air volume and air pressure at the moment of starting the hair dryer can be buffered without losing much air volume and air pressure.

[0013] Preferably, the communication port is arranged staggered with the gap.

[0014] The advantage is that the air flow at the communication port enters the axial section to increase the air volume and air pressure.

[0015] Preferably, the gap is located above the axis of the shell.

[0016] The advantage is that when the hair dryer is used for hair blowing, the position above the axis of the shell is relatively far away from the scalp surface compared with the position below the axis of the shell, the air pressure and air volume at the position where the air outlet corresponds to the setting position of the internal gap are relatively small, so that the position with large air pressure and air volume of the air outlet is for a long time, which is beneficial to quickly dry the hair.

[0017] Preferably, the notch cylinder is provided with a perforation for the airflow from the main air duct to enter the notch cylinder, and the perforation and the notch are at least partially overlapped; the advantage is that the airflow entering the notch cylinder can reach the notch through the shortest distance, promoting the flow of the airflow stored at the notch to be blown out from the air outlet, increasing the air volume and air pressure.

[0018] Alternatively, the notch cylinder is provided with a perforation for the airflow from the main air duct to enter the notch cylinder, and the perforation is located on the upstream side of the starting end of the notch and oppositely arranged to the notch; the advantage is that the airflow entering the notch cylinder from the perforation can pass through the notch, promoting the flow of the airflow stored at the notch to be blown out from the air outlet, increasing the air volume and air pressure.

[0019] Preferably, the front end of the notch cylinder is provided with an auxiliary air outlet, and the airflow in the notch cylinder is blown out from the auxiliary air outlet; the advantage is that the air volume and air pressure are increased.

[0020] Preferably, the main air duct includes a vertical section defined by the handle assembly, and the airflow inlet for the airflow from the vertical section to enter the axial section is defined at the connection between the handle assembly and the housing, the communication port includes the airflow inlet, and the notch is arranged away from the airflow inlet.

[0021] The advantage is that when the fan unit is arranged in the handle assembly, the airflow in the housing enters the housing through the handle assembly, and the notch is arranged away from the airflow inlet to ensure that the airflow can enter the housing and then extend in the housing to be blown out from the air outlet.

[0022] Preferably, the notch is a perforation for the airflow to enter the notch cylinder.

[0023] The advantage is that at the moment of starting the electric hair dryer, the airflow first enters the interior of the notch cylinder through the perforation, reducing the air volume and air pressure at the moment of starting; after being used for a certain period of time, the air volume and air pressure gradually increase and gradually become constant. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the whole machine structure of the electric hair dryer.

[0025] Figure 2 It is an example of the electric hair dryer. Figure 1 The section S referred to in the figure Figure 1 .

[0026] Figure 3 It is another example of the electric hair dryer. Figure 1 The section S referred to in the figure Figure 2 .

[0027] Figure 4 It is another example of the electric hair dryer. Figure 1 The section S referred to in the figure Figure 3 .

[0028] Figure 5 Structure diagram of the notch cylinder according to the present application.

[0029] Figure 6 Structure diagram of the notch cylinder according to the present application.

[0030] Figure 7 Structure diagram of the notch cylinder according to the present application.

[0031] Figure 8 Structure diagram of the first air outlet according to the present application.

[0032] Figure 9 Structure diagram of the first air outlet according to the present application.

[0033] Figure 10 Structure diagram of the notch cylinder according to the present application.

[0034] Figure 11 Structure diagram of the notch cylinder according to the present application.

[0035] Figure 12 Structure diagram of the notch cylinder according to the present application.

[0036] Figure 13 Structure diagram of the first air outlet according to the present application.

[0037] Figure 14 Structure diagram of the non-closed duct according to the present application.

[0038] Figure 15 Structure diagram of the heating unit according to the present application.

[0039] Figure 16 Structure diagram of the auxiliary air duct according to the present application.

[0040] Figure 17 Structure diagram of the reversing passage according to the present application.

[0041] Figure 18 Structure diagram of the reversing passage according to the present application.

[0042] The names of the components in the figures are as follows: 1, housing; 2, handle assembly; 3, heating unit; 301, mica sheet; 3011, overhanging 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; 15, second notch; 16, opening; 17, air outlet member; 171, barrier; 172, outer ring; 173, rib; 18, non-closed duct; 19, first part; 20, second part; 21, barrier sheet; 22, auxiliary air duct; 2201, inlet section; 2202, outlet section; 23, second air outlet; 24, mixed air outlet; 25, reversing passage; 26, air guide slope. DETAILED DESCRIPTION

[0043] The present application will be described in detail below with reference to the accompanying drawings.

[0044] As Figures 1 to 6 shown in the drawings, an electric hair dryer comprises 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; The fan unit is used to draw air flow into the electric 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; The fan unit comprises a fan blade and a motor for driving the fan blade to rotate (the fan unit is not shown in the drawings); The main air duct comprises an axial section 6 extending along the axial direction of the housing 1, and a notched cylinder 7 with a notch 701 is arranged in the housing 1, and the notched cylinder 7 and a cylindrical wall 8 inside the housing 1 define the axial section 6. The air flow direction of the axial section 6 is indicated by the arrows in 2, 3 and 4.

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

[0046] As Figure 2 , 4As shown, the cylindrical wall 8 inside the shell 1 can be the inner side wall of the shell 1, and the axial section 6 of the main air duct is defined by the inner side wall of the shell 1 and the outer side wall of the cutout cylinder 7; or it can be an inner cylinder arranged inside the shell 1, which is a separate component, and 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 cutout cylinder 7.

[0047] By arranging the cutout 701, part of the airflow of the axial section 6 is collected and stored at the cutout 701 or the airflow of the axial section 6 enters the inner space of the cutout cylinder 7 through the cutout 701 at the moment when the hair dryer is started, and the remaining airflow extends along the space defined by the cylindrical wall 8 and the outer side wall of the cutout cylinder 7 and is blown out from the air outlet, thereby reducing the air volume and air pressure at the starting moment; as the working time of the hair dryer is prolonged, the airflow at the cutout 701 or in the cutout cylinder 7 is gradually collected until saturation, and the air volume and air pressure are gradually increased and gradually constant, improving the user experience.

[0048] The cutout 701 will be described in detail below, as shown in Figure 5 As shown, the cutout 701 extends along the axis (b-b') of the cutout cylinder 7, and the ratio of the length of the cutout 701 to the length of the cutout cylinder 7 is not less than 1 / 2, the length of the cutout 701 is L1, and the maximum length of the cutout cylinder 7 is B. The cutout 701 can extend from the upstream end of the cutout cylinder 7, or it can extend from a position close to the upstream end. In the present application, "upstream" refers to a position close to the rear end of the shell 1, and "downstream" refers to a position away from the rear end of the shell 1. In this example, the ratio of the length of the cutout 701 to the length of the cutout cylinder 7 is 0.95. Increasing the area of the wind storage area effectively buffers the air volume and air pressure at the starting moment of the motor.

[0049] The cutout 701 has a maximum width A perpendicular to the axial direction of the cutout cylinder 7 in a projection perpendicular to the axis of the cutout cylinder 7, and the cutout cylinder 7 has a maximum width D perpendicular to the axial direction of the cutout cylinder 7 in a projection perpendicular to the axis of the cutout cylinder 7, and 0.1≤A / D≤1, which has the advantages of buffering the air volume and air pressure at the starting moment of the hair dryer and reducing air volume loss; when A / D>1, the cutout 701 is too large, causing a large amount of airflow to accumulate inside the shell 1 and not to be blown out from the air outlet in time, resulting in serious air volume loss; when A / D>0.1, the cutout 701 is too small, and the buffering effect on the air volume and air pressure at the starting moment of the hair dryer is not obvious. Preferably, 0.1≤A / D≤0.5, and in this example, A / D=0.3. Further, the cutout 701 extends along the axis of the cutout cylinder 7, and the cutout 701 has a maximum length B parallel to the axial direction of the cutout cylinder 7 in a projection perpendicular to the axis of the cutout cylinder 7, and A

[0050] As shown in Figure 6As shown, the central angle of the notch 701 is α, where 15°≤α≤180°. This has the advantage of buffering the airflow and pressure at the moment the hair dryer starts, while ensuring minimal loss of airflow and pressure, allowing for rapid hair drying. When α<15°, the notch 701 is too small, and its buffering effect on the airflow and pressure at the moment the hair dryer starts is not significant. When α>180°, the notch 701 is too large, causing a large amount of airflow to accumulate inside the outer casing 1 and not be able to escape from the air outlet in time, resulting in significant airflow loss. Furthermore, 15°≤α≤90°, preferably 30°≤α≤60°, is preferred; in this example, α=45°. The central angle α is the angle formed by the two longest lines from the two ends forming the notch 701 to the axis of the notch cylinder 7.

[0051] like Figure 2 , 3 As shown in Figure 4, a communication port 9 is formed at the connection between the handle assembly 2 and the housing 1, allowing communication between the two. The notch 701 extends to the upstream side of the communication port 9; or, the communication port 9 is formed at the connection between the handle assembly 2 and the housing 1, allowing communication between the two. The notch 701 extends to / across 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 crosses the downstream side of the communication port 9.

[0052] The connecting port 9 and the notch 701 are offset. In this invention, "offset" means that the edges of the notch 701 are offset from the connecting port 9, and the side wall of the notch cylinder 7 has the shortest distance to the connecting port 9. The notch 701 is located above the axis of the outer shell 1, and further, the notch 701 is symmetrical about the axis of the handle assembly 2.

[0053] like Figures 3 to 7 As shown, the notched cylinder 7 is provided with a perforation 702 for the airflow of the main air duct to enter the notched cylinder 7. The projections of the perforation 702 and the notch 701 at least partially overlap. The projections of the axes of the perforation 702 and the notch 701 are parallel or coincident, preferably the projection of the notch 701 covers the projection of the perforation 702, that is, the projections of the axes of the perforation 702 and the notch 701 coincide. In this example, the axis of the notch 701 is parallel to the axis (b-b') of the notched cylinder 7.

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

[0055] Further, the length of the perforation 702 is less than the length of the gap 701, thereby reducing the loss of air volume and air pressure.

[0056] Further, the center line (kc-kc') of the perforation 702 is parallel to or coincides with the projection of the center line of the handle assembly 2. It can be understood that the center line of the perforation 702 intersects with the projection of the center line of the handle assembly 2.

[0057] Further, the perforation 702 is located below the axis of the cylindrical wall 8 and opposite the air flow inlet 10.

[0058] Further, the gap cylinder 7 is provided with an air flow guide portion, which makes the air flow entering the gap cylinder 7 extend along the axis direction of the housing 1. The air flow guide portion is a wind guide slope 26 (not shown in the figure) located on the side wall of the gap cylinder 7, which is preferably streamlined to reduce the loss of air volume; or it can be a wind guide slope 26 located on other structural members inside the gap cylinder 7.

[0059] Further, the front end of the gap cylinder 7 is provided with an auxiliary air outlet 11, through which the air flow in the gap cylinder 7 blows out, which has the advantage of increasing air volume and air pressure.

[0060] It can be understood that the gap cylinder 7 is provided with a perforation 702 for the air flow of the main air duct to enter the gap cylinder 7, which is located on the upstream side of the starting end of the gap 701 and opposite the gap 701.

[0061] When the fan unit is arranged in the handle assembly 2, 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 main air duct includes a vertical section defined by the handle assembly 2, and the handle assembly 2 and the connection part of the housing 1 define an air flow inlet 10 for the air flow to enter the axial section 6 from the vertical section. The gap 701 is arranged opposite the air flow inlet 10. The air flow inlet 10 is arranged on the cylindrical wall 8 and corresponds to the communication opening 9, and the center line of the air flow inlet 10 is the same as the center line of the handle assembly 2. The gap 701 is located above the axis (a-a') of the cylindrical wall 8, so that most of the air flow entering the axial section 6 from the vertical section directly blows out from the air outlet, reducing the loss of air volume and air pressure; at the same time, it is also beneficial to quickly dry the hair; and further, the gap 701 is arranged opposite the air flow inlet 10. Further, the gap cylinder 7 is provided with a perforation 702 for the air flow of the main air duct to enter the gap cylinder 7, which is located below the axis of the cylindrical wall 8 and opposite the air flow inlet 10, which has the advantage that the air flow of the vertical section enters the inside of the gap cylinder 7 through the shortest distance, reducing the loss of air volume.

[0062] In another example, the notch 701 is a perforation 702 that allows airflow to enter the notched cylinder 7.

[0063] like Figures 8 to 14 As shown, the first air outlet 5 is a non-closed slit located at the end of the axial section 6. In this invention, a "non-closed slit" refers to a narrow slit where 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 the airflow from the axial section 6 of the main air duct. The non-closed slit can be a continuous slit for the airflow from the axial section 6 of the main air duct; or it can be a combination of multiple small slits for the airflow from the axial section 6 of the main air duct (i.e., it can be regarded as a continuous slit interrupted by a rib 173 to increase strength). The open portion 13 is formed between the starting end of the first small slit and the end of the last small slit. The area between the open ends 12 can be solid or other forms.

[0064] The advantage of making the first air outlet 5 a "non-closed slit" is that the airflow blowing from the first air outlet 5 has a larger air pressure. This part of the airflow drives the airflow in the open part 13 of the non-closed slit. This airflow has a smaller air pressure. Outside the hair dryer, at a certain distance from the first air outlet 5 and before reaching the hair surface, the two airflows converge into one airflow, which appropriately reduces the air pressure. When drying long hair, it is not easy to blow the hair at an excessively large angle, making it more messy during and after the drying process. When the hair is short, less force is applied to the hair roots. When the user only needs to dry the hair and does not need to style it, blowing in one direction for a long time will not change the original orientation of the hair roots, making the hair easier to manage after drying.

[0065] like Figure 9As shown, the width of the non-closed slit is d, where 1mm ≤ d ≤ 20mm. This increases both wind pressure and the airflow per unit time. When d < 1mm, the airflow per unit time is low, and more airflow accumulates inside the outer casing 1. When d > 20mm, the airflow is not concentrated when it blows out from the first air outlet 5, resulting in slow hair drying efficiency. Furthermore, 5mm ≤ d ≤ 10mm, preferably d = 8mm. The width of the non-closed gap is d, and the length is L, with 0.05 ≤ d / L ≤ 0.5. This has the advantage of balancing air volume and air pressure. When d / L < 0.05, with a fixed length L, the air volume per unit time is relatively small, and more airflow accumulates inside the outer casing 1. With a fixed width d, this will make the overall size larger, less aesthetically pleasing, and harder to store. When d / L > 0.5, with a fixed length L, the airflow inside the outer casing 1 can be quickly blown out from the first air outlet 5, but the air pressure is relatively low, which is not conducive to blowing away wet hair. With a fixed width d, this is not conducive to the airflow from the outer casing 1, causing airflow to accumulate inside the outer casing 1, resulting in a loss of air volume. Width d refers to the line connecting the two points on the non-closed gap that are furthest apart from the center line perpendicular to the center line when the non-closed gap is cut along a cross section perpendicular to the center line. Length L refers to the length of the line connecting the center of the beginning and end of the non-closed gap. If the line connecting the two points is a curve, the length of the arc whose shape is similar to that of the non-closed gap is L (not shown in the figure).

[0066] The non-closed slit has an open portion 13, with a central angle β of 15° ≤ β ≤ 180°. This design effectively reduces the air pressure reaching the hair, allowing airflow to escape from the outer casing 1 promptly without significant air pressure loss. When β < 15°, the air pressure reduction is insignificant, and the hair is easily blown into disarray. Prolonged blowing directly at the hair roots to dry them can lead to unwanted hair growth. When β > 180°, the first air outlet 5 is too small, causing airflow to accumulate inside the outer casing 1 and resulting in airflow loss. The central angle β is the angle formed by the lines connecting the two ends of the open portion 13 (i.e., the beginning and end of the non-closed slit) to the center of the non-closed slit. If the two ends of the open portion 13 have a certain width or the shape of the ends is irregular, the angle is formed by the two lines with the shortest length connecting the two ends to the center of the non-closed slit. Furthermore, 15°≤β≤90°, 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 notch cylinder 7. The airflow of the main air duct blows out from the open part 13.

[0067] The non-closed gap has a width of d, and the projection of the open part 13 along the direction perpendicular to the center line of the non-closed gap has a maximum width of d1, and 0.1≤d / d1≤1, which has the advantages that the open part 13 can reduce the overall wind pressure, and the airflow of the main air duct can be blown out in time to prevent the airflow from accumulating inside the shell 1 to cause wind loss; when d / d1<0.1, the open part 13 is too large, the wind pressure loss is large, which is not conducive to spreading the wet hair and reducing the drying efficiency, and when d is too small, the airflow is easy to accumulate inside the shell 1 to cause wind loss; when d / d1>1, the open part 13 is too small, the wind pressure reduction effect is not obvious, the hair is relatively messy after being blown dry, and when d is too large, it is not conducive to improving the wind pressure and spreading the wet hair.

[0068] The open part 13 is located on one side of the center line of the non-closed gap, which indicates that the non-closed gap is arranged around the center line, and the center of the non-closed gap is inside, so that the airflow of the main air duct blown out from the first air outlet 5 and the airflow at the open part 13 driven by the airflow form a whole circle, and according to the distance between the first air outlet 5 and the hair when the user blows the hair, the two airflows will be combined into one before reaching the hair, improving the hair blowing effect.

[0069] The open part 13 is located above the center line of the shell 1. According to the habit of the user holding the hair dryer during the hair blowing process, the area below the center line of the shell 1 is the main part during the whole hair blowing process, and the airflow at the open part 13 is mainly driven by the airflow of the main air duct blown out from the first air outlet 5, and the air volume and wind pressure are relatively small. If the user is used to blowing the hair dryer close to the hair, the two airflows reach the hair surface before being combined into one, and the open part 13 located above the center line of the shell 1 is conducive to blowing the larger wind pressure and more airflow to the hair to achieve the purpose of quickly drying the hair.

[0070] The two ends of the open part 13 are located on both sides of the center line of the handle assembly 2. The two ends of the open part 13 can be symmetrical or not symmetrical about the two sides of the center line of the handle assembly 2.

[0071] As Figure 9As shown, the non-closed projection is formed by a plurality of curves connected end to end, i.e. the non-closed gap is defined by a plurality of members. Further, the housing 1 is provided with a notch cylinder 7, the axial section 6 is defined by the notch cylinder 7 and a cylindrical wall 8 inside the housing 1, and the non-closed gap is defined by the notch cylinder 7 and the cylindrical wall 8. The notch 701 extends along the axial direction of the housing 1, and the notch 701 can extend from the upstream end of the notch cylinder 7 to the downstream end thereof, or extend from the downstream end of the notch cylinder 7 to the upstream end thereof. In one example of the non-closed gap, the cylindrical wall 8 is provided with an extension 14 extending downward, the extension 14 closes a part of the gap between the notch cylinder 7 and the cylindrical wall 8 to form the non-closed gap. In one case, the gap between the notch cylinder 7 and the cylindrical wall 8 is annular, and the extension 14 closes a part of the annular gap to form the non-closed gap, the extension 14 abuts against the outer side wall of the notch cylinder 7, and the opening 13 is the extension 14. The non-closed gap has a C shape, a U shape or a similar shape. In another case, as shown in Figure 10 As shown, the notch 701 is provided at the front end of the notch cylinder 7, and the extension 14 closes at least a part of the notch 701, and the non-closed gap has a C shape, a U shape or a similar shape. Further, the notch 701 extends rearward from the front end of the notch cylinder 7, and the ratio of the length of the notch 701 to the length of the notch cylinder 7 is not less than 1 / 2. The extension 14 closes the notch 701, so that the shape of the airflow of the axial section 6 before reaching the non-closed gap is substantially the same as that of the non-closed gap, and the airflow of the axial section 6 is rapidly blown out along the side wall of the extension 14, the side wall of the notch cylinder 7 and the cylindrical wall 8, so that the airflow does not accumulate in the housing 1, and the air volume loss is reduced.

[0072] In another example, as shown in Figure 11 , 12 As shown, the front end of the notch cylinder 7 is provided with a second notch 15703701 spaced from the notch 701, 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 is directed in the same direction as the notch 701, and the opening 13 is the second notch 15703701. Preferably, the opening 13 and the notch 701 have the same axis, and the air volume loss is reduced.

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

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

[0075] Understandably, the airflow in the axial section 6 includes an annular airflow that exits from the non-closed gap before reaching it; in this case, the outer casing 1 is provided with an inner cylinder, and the annular airflow is defined by the outer wall of the inner cylinder and the cylindrical wall 8 inside the outer casing 1.

[0076] like Figure 14 As shown, the projection of the non-closed gap is enclosed by a single closed curve, that is, the non-closed gap is defined by a single component. More specifically, the housing 1 is provided with a non-closed duct 18, 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 of the same shape as the non-closed gap before reaching it, which is blown out from the non-closed gap.

[0077] like Figures 1 to 15 As shown, the heating unit 3 is disposed in the axial section 6. The heating unit 3 includes a notched cylinder 7, which has a notch 701 extending along its axial direction. The notched cylinder 7 and the cylindrical wall 8 inside the outer casing 1 define the axial section 6. The notched cylinder 7 allows airflow to temporarily converge inside the outer casing 1, giving the airflow sufficient time to transfer heat to the heating unit 3 before it is blown out from the first air outlet 5 under the influence of other airflows. This prevents the heating wire 302 from glowing red, making it safer to use.

[0078] In one example, the length of the notch 701 is at least half the length of the notch cylinder 7, forming an air outlet area for heat exchange with the heating unit 3, preventing the heating wire 302 from glowing red. Further, the length of the notch 701 is at least two-thirds the length of the notch cylinder 7. The heating unit 3 also includes multiple mica sheets 301 mounted on the notch cylinder 7 and heating wires 302 wound around the multiple mica sheets 301, with the multiple mica sheets 301 located at least on both sides of the notch 701; further, the multiple mica sheets 301 are evenly spaced along the axial direction of the notch cylinder 7. The heating wire 302 is wound around the entire circle; or the heating wire 302 is only wound above the mounting bracket, with the notch 701 open.

[0079] In another example, at least one of the plurality of mica sheets 301 is arranged corresponding to the gap 701, and the mica sheet 301 has a free end 3011 extending axially along the mounting bracket towards the gap 701. In this case, the gap cylinder 7 is arranged corresponding to the gap 701, and is provided with a structure for fixing the mica sheet 301, in particular when the length of the gap 701 is relatively long, and is provided with a clamping groove at both ends of the gap cylinder 7 for fixing the mica sheet 301; the mica sheet 301 is arranged in the same direction as the gap 701, and the mica sheet 301 is arranged directly above the gap 701.

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

[0081] Further, the fan unit is arranged in the handle assembly 2, and the cylindrical wall 8 is provided with an air inlet 10, and the air flow in the handle assembly 2 enters the housing 1 from the air inlet 10, and the gap 701 is arranged offset from the air inlet 10.

[0082] Further, the gap cylinder 7 is provided with a perforation 702 arranged opposite the air inlet 10, and the air flow enters the interior of the gap cylinder 7 through the perforation 702, which can promote the air flow at the gap 701, and the air flow collected at the gap 701 is blown out from the first air outlet 5, carrying away heat.

[0083] The present application also relates to a heating unit 3 of an electric hair dryer, comprising a plurality of mica sheets 301 and heating wires 302 wound on the mica sheets 301, wherein the heating unit 3 further comprises a mounting bracket having a hollow channel, the plurality of mica sheets 301 are mounted on the mounting bracket, the mounting bracket has a gap 701 extending axially along the mounting bracket, and the plurality of mica sheets 301 are arranged at least on both sides of the gap 701. In one example, the hollow mounting bracket is the gap cylinder 7 described above.

[0084] The mounting bracket further comprises a second part 20 extending outwardly along the circumference of the first part 19 at the rear end of the first part 19, and the rear end of the mica sheet 301 abuts against the inner side of the second part 20. This improves the fixing reliability of the mica sheet 301. The first part 19 is the gap cylinder 7, and the second part 20 is annular or circular or U-shaped or C-shaped.

[0085] The rear end of the mica sheet 301 has a clamping groove abutting against the circumference of the second part 20.

[0086] The hollow channel is provided with a blocking sheet 21 arranged close to the front end of the hollow channel. When the length of the gap 701 is relatively long, the blocking sheet 21 improves the strength of the hollow mounting bracket, preventing deformation of the mounting bracket and causing relatively large air resistance to the air flow in the axial section 6, resulting in loss of air volume.

[0087] As shown in Figures 1 to 18 A hair dryer, comprising a housing 1, a handle assembly 2 connected with the housing 1, a fan unit, a heating unit 3, a first air inlet 4 and a first air outlet 5; The fan unit is used to suck air flow into the hair dryer from the first air inlet 4 and blow 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; The fan unit comprises a fan blade and a motor used to drive the fan blade to rotate; The hair dryer further comprises an auxiliary air duct 22 extending around the axial section 6, and at least part of the air flow of the auxiliary air duct 22 is mixed with at least part of the air flow of the axial section 6 in the housing 1 and then blown out. If the two air flows are blown out independently first and then mixed outside the housing 1, the two air flows will reach the hair without mixing if the first air outlet 5 is not far enough from the hair surface, and the intensity felt by the same area will be different, and due to the difference in air volume and air force of the two air flows, some hair in the same area will be dried while some will not. When the air flow of the auxiliary air duct 22 is cold air flow and the air flow of the axial section 6 is hot air flow, the two air flows are mixed and blown out, which prevents the generation of hot spots and makes the same area on the scalp not feel hot when being blown for a long time. When the air flow of the auxiliary air duct 22 is air flow of the same nature, the mixing of the two air flows in the housing 1 makes the intensity felt by the same area not differ much when the air flow reaches the hair regardless of the distance of the first air outlet 5, and the hair in the same area will be dried at the same time, and the hair dryer can be moved to blow the hair in other areas, or the hair in the same area can be blown back and forth according to personal habits, and the hair in the whole area is close to being dried at the same time, and the wet hair accounts for a small proportion, which reduces the probability of damage to the hair.

[0088] As shown in Figure 16 , 17 The auxiliary air duct 22 comprises an inlet section 2201 and an outlet section 2202, and the air flow of the axial section 6 and the air flow of the inlet section 2201 are independent of each other at the inlet section 2201. In an example, the first air inlet 4 is arranged at the rear end of the housing 1, and an inner cylinder is arranged in the housing 1 to separate the air flow sucked into the housing 1 by the fan unit into the auxiliary air duct 22 and the main air duct (which is 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, and the axial section 6 comprises an inner side wall defined by the inner cylinder, and the air flows of the two air ducts are independent of each other first, mixed in the housing 1 near the first air outlet 5, and then blown out from the same outlet. The same outlet can be the first air outlet 5 of the main air duct, or another outlet arranged additionally.

[0089] Further, the fan unit is arranged in the handle assembly 2, and the first air inlet 4 is arranged on the handle assembly 2, and the rear end of the axial section 6 is sealed, which reduces the air pressure loss of the main air duct. Further, the rear end of the housing 1 is provided with a second air inlet (not shown in the figure) of the auxiliary air duct 22, and the first air inlet 4 is located downstream of the second air inlet.

[0090] In another example, the front end of the housing 1 includes a mixed air outlet 24, and the mixed air outlet 24 is arranged to blow out the mixed air of the partial air of the axial section 6 and the at least partial air of the auxiliary air duct 22, and the partial air of the axial section 6 is blown out from the first air outlet 5. The first air outlet 5 is located outside the mixed air outlet 24, and the first air outlet 5 is arranged around the mixed air outlet 24, which is beneficial in that the air blown out from the first air outlet 5 is annular or approximately annular, and the annular air flow surrounds the linear air flow, which can promote the air blown out from the first air outlet 5 to flow forward along the axis of the housing 1 to the hair surface. “Approximately annular” includes a plurality of small outlets arranged to form a ring as a whole, or a ring with a notch 701 (for example, U-shaped, C-shaped) and other approximate shapes. Further, the front end of the housing 1 is further provided with a second air outlet 23, and the partial air of the auxiliary air duct 22 is blown out 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, and the air of the axial section 6 and the air of the auxiliary air duct 22 are each divided into two in the housing 1, the mixed air of the partial air of the axial section 6 and the partial air of the auxiliary air duct 22 is blown out from the mixed air outlet 24, the other air of the axial section 6 is blown out from the first air outlet 5, and the other air of the auxiliary air duct 22 is blown out from the second air outlet 23.

[0091] In another example, the air in the auxiliary air duct 22 flows into the axial section 6 and is blown out from the first air outlet 5, in which case the air outlet is only the first air outlet 5, and all the air in the auxiliary air duct 22 flows into the axial section 6; or the front end of the housing 1 is further provided with a second air outlet 23, and part of the air of the auxiliary air duct 22 flows into the main air duct and is blown out from the first air outlet, and the remaining part of the air is blown out from the second air outlet 23.

[0092] Further, the housing 1 is provided with an inner cylinder for separating the axial section 6 and the auxiliary air duct 22, and the inner cylinder is provided with a passage for the air of the auxiliary air duct 22 to enter the axial section 6. When the heating unit 3 is arranged in the axial section 6, the inner cylinder plays a heat insulation role to prevent the housing 1 from being too hot after blowing hair for a long time.

[0093] The main air duct comprises an axial section 6 extending along the axis of the housing 1, the axial section 6 being defined at least by the inner cylinder, the hair dryer further comprises a secondary air duct 22 extending around the axial section 6, the secondary air duct 22 being defined by the inner cylinder and the housing 1, the inner cylinder is provided with a reversing passage 25, the airflow of the secondary air duct 22 changes the airflow direction through the reversing passage 25 and mixes with the airflow of the axial section 6 and then blows out. The reversing passage 25 is a channel provided on the inner cylinder.

[0094] The inner cylinder is provided with a wind guide slope 26 for the airflow of the secondary air duct 22 to enter the reversing passage 25. By providing the wind guide slope 26, the air volume loss caused by the airflow entering the reversing passage 25 is reduced. The wind guide slope 26 extends from upstream to downstream of the housing 1 along the axis of the housing 1. The center line of the reversing passage 25 and the center line of the axial section 6 form an angle, and the angle is not greater than 90°. The advantage is that after the airflow changes direction through the reversing passage 25, the force acting on the airflow blowing in the axial direction is reduced, and the wind power loss is reduced. When the angle is greater than 90°, the airflow through the reversing passage 25 generates a force opposite to the airflow flowing forward in the axial direction, which reduces the wind power reaching the hair surface and is not conducive to dispersing wet hair, reducing the drying efficiency. Further, the angle is not less than 10°, so that the airflow realizes mixing through a shorter path, reducing air volume loss. When the angle is less than 10°, in order to realize mixed airflow, a longer path is needed, which will cause air volume loss and reduce mixing efficiency and wind speed. In this example, the center line of the reversing passage 25 and the center line of the axial section 6 form an angle of 90°. Further, the angle between the wind guide slope 26 and the center line of the reversing passage 25 is γ, 10°≤γ≤60°. The advantage is that the airflow is introduced into the reversing passage 25, reducing the air volume loss caused by the airflow entering the reversing passage 25. When γ>60°, air volume loss will occur at the corner of the wind guide slope 26 and the reversing passage 25. When γ<10°, air volume loss will occur when the airflow enters the reversing passage 25 through the wind guide slope 26. The airflow in the reversing passage is preferably γ=30°.

[0095] The airflow of the secondary air duct 22 changes the airflow direction through the reversing passage 25 and intersects with the airflow of the axial section 6 in space. In this example, the reversing passage 25 has a certain length and width, and the airflow in the reversing passage 25 and the airflow of the axial section 6 are independent of each other. More specifically, the airflow in the reversing passage 25 and the airflow extending along the center line of the axial section 6 are independent of each other.

[0096] The reversing passage 25 is defined by an extension 14 of the inner cylinder extending in the axial direction of the outer shell 1, the extension 14 crossing the first air outlet 5. In this case, at least part of the airflow of the auxiliary air duct 22 is mixed with the airflow of the main air duct through the reversing passage 25, and the airflow of the axial section 6 is divided into two streams in the outer shell 1, one of which is blown out from the first air outlet 5, and the other is mixed with the airflow of the auxiliary air duct 22 and then blown out from the mixed airflow outlet 24 located inside the first air outlet 5. Further, the heating unit 3 is arranged in the inner cylinder, the heating unit 3 comprising a mounting bracket with a hollow channel, the end of the mounting bracket defining the mixed airflow outlet 24, from which the airflow of the auxiliary air duct 22 is mixed with the airflow of the axial section 6 and blown out, and the first air inlet 4 is defined by the inner cylinder and the mounting bracket. Further, the mounting bracket is provided with a notch 701, and the extension 14 blocks the notch 701.

[0097] The inner cylinder is further provided with a second air outlet 23, and part of the airflow of 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 airflow outlet 24. The outer side of the inner cylinder is provided with an annular ring, and the annular ring is connected to the outer wall of the inner cylinder by a connecting rib. The second air outlet 23 is annular; the second air outlet can also be defined by the interlayer between the inner cylinder and the outer shell.

[0098] In the present application, 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.

[0099] The above embodiments are only the preferred embodiments of the present application, and are not all the embodiments of the present application. According to the principles of the present application, those skilled in the art can make various modifications, as long as they do not deviate from the spirit of the present application, and all should belong to the scope defined by the claims of the present application.

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; wherein the fan unit is used to draw airflow into the hair dryer from the air inlet and blow it out from the air outlet to form a main airflow duct, and the heating unit is used to heat the airflow; the fan unit includes fan blades and a motor for driving the fan blades to rotate; characterized in that, The main air duct includes an axial section extending along the axis of the outer casing. The outer casing has a notched cylinder with a notch, which, together with the cylindrical wall inside the outer casing, defines the axial section. The notch is located above the axis of the outer casing.

2. The hair dryer according to claim 1, characterized in that, The notch extends along the axial direction of the notched cylinder, and the ratio of the length of the notch to the length of the notched cylinder is not less than 1 / 2.

3. The hair dryer according to claim 2, characterized in that, The connection between the handle assembly and the housing forms a communication port that connects the two, and the notch extends to the upstream side of the communication port.

4. The hair dryer according to claim 2, characterized in that, The connection between the handle assembly and the housing forms a communication port that connects the two, and the notch extends to / across the downstream side of the communication port; or the notch extends between the upstream and downstream sides of the communication port.

5. The hair dryer according to claim 4, characterized in that, The connecting port and the notch are staggered.

6. The hair dryer according to any one of claims 1 to 5, characterized in that, The notched cylinder is provided with a perforation for the airflow of the main air duct to enter the notched cylinder, and the projection of the perforation and the notch at least partially overlaps; or, the notched cylinder is provided with a perforation for the airflow of the main air duct to enter the notched cylinder, the perforation is located on the upstream side of the notch starting end, and the two are arranged opposite to each other.

7. The hair dryer according to claim 6, characterized in that, An auxiliary air outlet is provided at the front end of the notched cylinder, and the airflow inside the notched cylinder is blown out from the auxiliary air outlet.

8. The hair dryer according to claim 1, characterized in that, The main air duct includes a vertical section defined by a handle assembly, and the connection between the handle assembly and the housing defines an airflow inlet for airflow to enter the axial section from the vertical section. The notch is offset from the airflow inlet.

9. The hair dryer according to claim 1, characterized in that, The notch is a perforation that allows airflow to enter the notch cylinder.

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