An electric hair dryer

Abstract

The present application relates to the field of household appliances, in order to solve the problem of the existing technology that the air volume and air pressure of the electric hair dryer are too large at the moment of starting, which scares the user, and provides an electric hair dryer, comprising 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 to suck the airflow into the electric 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 airflow; the fan unit comprises a fan blade and a motor used to drive the fan blade to rotate; wherein the main air duct comprises an axial section extending along the axis direction of the shell, a notched cylinder with a notch is arranged in the shell, the notch extends along the axis direction of the shell, and the notched cylinder and the cylindrical wall inside the shell define the axial section. The air volume and air pressure of the electric hair dryer at the moment of starting are small, which prepares the user psychologically, and then the air volume and air pressure gradually increase and tend to be constant, so that the electric hair dryer is convenient for rapid hair drying.

Description

Technical Field

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

[0002] In the prior art, a hair dryer includes a housing and a duct. The airflow drawn into the hair dryer by a fan unit includes an axial section extending between the housing and the duct. The airflow is roughly annular. This method facilitates the airflow in the housing to be quickly blown out of the hair dryer along the side walls of the housing and the duct.

[0003] However, with this method, when the hair dryer is powered on, the air drawn into it by the fan unit is quickly blown out. If the air outlet is facing someone's face during use, the airflow, especially with high air volume and pressure, can startle them and cause them to temporarily hold their breath. Alternatively, when the air outlet is aimed at the hair (women with long hair might start by blowing from the ends) or scalp, the high-pressure airflow instantly blows towards the hair and scalp, subjecting them to a significant force and causing discomfort. Starting with a low wind setting and then switching to a high wind setting is also cumbersome. Summary of the Invention

[0004] In order to solve the problems in the prior art, the present invention provides a hair dryer that can have a small air volume and air pressure when turned on at the same gear, and the air volume and air pressure gradually increase and stabilize as the power-on time increases, giving users a good usage experience.

[0005] The technical solutions of the present invention are as follows:

[0006] 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;

[0007] The fan unit is used to draw air from the air inlet into the hair dryer 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;

[0008] The fan unit includes fan blades and a motor for driving the fan blades to rotate;

[0009] The main air duct includes an axial section extending along the axial direction of the shell. A notch tube with a notch is provided in the shell. The notch extends along the axial direction of the shell. The notch tube and the cylindrical wall inside the shell define the axial section.

[0010] The advantage is that, through the setting of the notch tube, the airflow in the axial section is converged at the notch, thereby increasing the air storage volume of the axial section. At the moment the hair dryer is started, the airflow is sucked into the axial section by the fan unit and part of the airflow gradually converges at the notch or enters the interior of the notch tube through the notch, and the remaining airflow is blown out from the air outlet along the direction defined by the outer wall and cylindrical wall of the notch tube, so that the wind pressure and air volume at the moment the hair dryer is started are relatively small; after the hair dryer is started and the airflow at the notch / or the internal space of the notch tube is filled, this part of the airflow will be blown out from the air outlet driven by the remaining airflow in the axial section, thereby increasing the wind pressure and air volume, and the stored airflow at the notch can balance the air volume and wind pressure at the air outlet, so that the air volume and wind pressure blown out from the air outlet are relatively constant.

[0011] Preferably, the notch extends from the upstream to the downstream of the notch tube, and the ratio of the length of the notch to the length of the notch tube is not less than 1 / 2.

[0012] The advantage is that it forms an appropriate air storage area to buffer the air volume and pressure at the moment the hair dryer is started. When the ratio of the two lengths is less than 1 / 2, the buffering effect on the air volume and pressure at the moment the hair dryer is started is not obvious.

[0013] Preferably, a communication port is formed at the connection between the handle assembly and the housing to connect the two, and the notch extends to the upstream side of the communication port.

[0014] The advantage is that it can buffer the air volume and pressure at the moment the hair dryer is started, without causing a large loss of air volume and pressure.

[0015] Preferably, a communication port is formed at the connection between the handle assembly and the housing to connect the two, and the gap extends to / over the downstream side of the communication port; or the gap extends to between the upstream side and the downstream side of the communication port.

[0016] The advantage is that it increases the area of ​​the air storage area and buffers the air volume and pressure at the moment the hair dryer is started.

[0017] Preferably, the communication port and the notch are staggered.

[0018] The advantage is that the airflow at the connecting port enters the axial section, increasing the air volume and pressure.

[0019] Preferably, the notch is located above the axis of the housing.

[0020] The advantage is that when using a hair dryer to blow dry hair, the position above the axis of the shell is relatively farther away from the scalp surface than the position below it, and the wind pressure and air volume at the position where the air outlet corresponds to the internal notch are relatively small, so that the position of the air outlet with higher wind pressure and air volume is facing the hair for a longer time, which is conducive to quickly drying the hair.

[0021] Preferably, the notched tube is provided with a perforation for allowing the airflow of the main air duct to enter the notched tube, and the projection of the perforation and the notch at least partially overlap; the advantage is that after the airflow enters the notched tube, it reaches the notch through the shortest distance, promoting the flow of the airflow stored in the notch to be blown out from the air outlet, thereby increasing the air volume and wind pressure.

[0022] Alternatively, the notched tube is provided with a perforation for allowing airflow from the main air duct to enter the notched tube, and the perforation is located upstream of the starting end of the notch, and the two are arranged opposite each other. The advantage is that the airflow entering the notched tube through the perforation is ensured to pass through the notch, promoting the flow of air stored in the notch to be blown out from the air outlet, thereby increasing air volume and pressure.

[0023] Preferably, the front end of the notch tube is provided with an auxiliary air outlet, and the air flow in the notch tube is blown out from the auxiliary air outlet. The advantage is that the air volume and air pressure are increased.

[0024] Preferably, the main air duct includes a vertical section defined by the handle assembly, the connection between the handle assembly and the shell defines an air flow inlet for the air flow to enter the axial section from the vertical section, the connecting port includes the air flow inlet, and the notch is staggered with the air flow inlet.

[0025] The advantage is that when the fan unit is set in the handle assembly, the airflow in the shell enters the shell through the handle assembly, and the gap and the airflow inlet are staggered to ensure that the airflow can enter the shell and then extend inside the shell and blow out from the air outlet.

[0026] Preferably, the notch is a perforation that allows airflow to enter the notch tube.

[0027] The advantage is that when the hair dryer is started, the air flow first passes through the perforations and enters the inside of the notched barrel, reducing the air volume and pressure at the moment of startup; after a certain period of use, the air volume and pressure gradually increase and become constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of the hair dryer of the present invention.

[0029] Figure 2 In one example of the present invention Figure 1 The S in the middle refers to the cross-section Figure 1 .

[0030] Figure 3 In another example of the present invention Figure 1 The S in the middle refers to the cross-section Figure 2 .

[0031] Figure 4 In another example of the present invention Figure 1 The S in the middle refers to the cross-section Figure 3 .

[0032] Figure 5 This is a schematic structural diagram of a notched cylinder in an example of the present invention.

[0033] Figure 6 This is a schematic structural diagram of the notched tube from another angle of the present invention.

[0034] Figure 7 This is another structural schematic diagram of the notched tube according to the present invention from another angle.

[0035] Figure 8 This is a structural schematic diagram of the first air outlet of the present invention.

[0036] Figure 9 This is a structural schematic diagram of the first air outlet of the present invention from another angle.

[0037] Figure 10 This is a schematic diagram of another structure of the notched tube according to the present invention.

[0038] Figure 11 This is a schematic diagram of another structure of the notched tube according to the present invention.

[0039] Figure 12 This is a schematic diagram of yet another structure of the notched tube according to the present invention.

[0040] Figure 13 This is another structural schematic diagram of the first air outlet of the present invention.

[0041] Figure 14 This is a schematic structural diagram of the non-enclosed pipeline of the present invention.

[0042] Figure 15 Schematic diagram of the structure of the heating unit of the present invention.

[0043] Figure 16 Schematic diagram of the structure of the auxiliary air duct of the present invention.

[0044] Figure 17 It is a structural schematic diagram of the reversing path of the present invention.

[0045] Figure 18 It is another structural schematic diagram of the reversing path.

[0046] The names of the components in the figure are as follows:

[0047] 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

[0048] The present application will be described in detail below with reference to the accompanying drawings.

[0049] 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.

[0050] 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.

[0051] 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).

[0052] 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 direction of the air flow in the axial section 6 is indicated by the arrows in 2, 3 and 4.

[0053] 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; or the fan unit can 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.

[0054] As Figure 2 , 4As shown, the cylindrical wall 8 inside the outer shell 1 can be the inner wall of the outer shell 1, and the axial section 6 of the main air duct is defined by the inner wall of the outer shell 1 and the outer wall of the notched tube 7; it can also be an inner tube arranged in the outer shell 1, which is a separate component, and the axial section 6 of the main air duct is defined by the inner wall of the inner tube and the outer wall of the notched tube 7.

[0055] Through the setting of the gap 701, at the moment the hair dryer is started, part of the airflow of the axial section 6 is gathered and stored at the gap 701, or the airflow of the axial section 6 enters the internal space of the gap tube 7 through the gap 701, and the remaining airflow extends along the space defined by the cylindrical wall 8 and the outer wall of the gap tube 7 and is blown out from the air outlet, thereby reducing the air volume and air pressure at the moment of startup; as the working time of the hair dryer increases, the airflow at the gap 701 or in the gap tube 7 gradually gathers until saturation, and the air volume and air pressure also gradually increase and become constant, thereby improving the user experience.

[0056] The gap 701 is described in detail below. Figure 5 As shown, the notch 701 extends along the axis (b-b') direction of the notch tube 7, and the ratio of the length of the notch 701 to the length of the notch tube 7 is not less than 1 / 2. The length of the notch 701 is L1, and the maximum length of the notch tube 7 is B. The notch 701 can extend from the upstream end of the notch tube 7, or from a position close to the upstream end. In the present invention, "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 notch 701 to the length of the notch tube 7 is 0.95. Increasing the area of ​​the air storage region can effectively buffer the air volume and air pressure at the moment of motor startup.

[0057] 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.

[0058] like Figure 6As 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.

[0059] 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.

[0060] 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.

[0061] like Figures 3 to 7 As shown, the notched tube 7 is provided with a through-hole 702 for allowing airflow from the main air duct to enter the notched tube 7. The projections of the through-hole 702 and the notch 701 at least partially overlap. The projections of the axes of the through-hole 702 and the notch 701 are parallel or overlap. Preferably, the projection of the notch 701 overlaps the projection of the through-hole 702, i.e., the projections of the axes of the through-hole 702 and the notch 701 overlap. In this example, the axis of the notch 701 is parallel to the axis (bb') of the notched tube 7.

[0062] Further, such as Figure 5 As shown, the width of perforation 702 can be the same as the width of notch 701; alternatively, the width of perforation 702 can be smaller than the width of notch 701; alternatively, the width of perforation 702 can be larger than the width of notch 701. In this example, the width of perforation 702 is smaller than the width of notch 701. The width of perforation 702 is K1, which refers to the maximum width perpendicular to the axis of notch cylinder 7 when projected in a direction perpendicular to the axis of notch cylinder 7. The length of perforation 702 is K2, which refers to the maximum length parallel to the axis of notch cylinder 7 when projected in a direction perpendicular to the axis of notch cylinder 7.

[0063] Furthermore, the length of the through hole 702 is shorter than the length of the notch 701 , thereby reducing the loss of air volume and air pressure.

[0064] Furthermore, the center line (kc-kc') of the through hole 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 through hole 702 intersects with the projection of the center line of the handle assembly 2.

[0065] Furthermore, the through hole 702 is located below the axis of the cylindrical wall 8 and is arranged opposite to the air flow inlet 10 .

[0066] Furthermore, the notched tube 7 is provided with an airflow guide portion, which directs the airflow entering the notched tube 7 along the axial direction of the housing 1. The airflow guide portion is an air guide slope 26 (not shown) located on the side wall of the notched tube 7. The slope is preferably streamlined to reduce air loss; it can also be an air guide slope 26 located on other structural components inside the notched tube 7.

[0067] Furthermore, an auxiliary air outlet 11 is provided at the front end of the notched tube 7, and the air flow in the notched tube 7 is blown out from the auxiliary air outlet 11, which has the advantage of increasing the air volume and air pressure.

[0068] It can be understood that the notched tube 7 is provided with a through hole 702 for allowing the airflow of the main air duct to enter the notched tube 7. The through hole 702 is located on the upstream side of the starting end of the notch 701, and the two are arranged opposite to each other.

[0069] 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.

[0070] In another example, the notch 701 is a through hole 702 that allows airflow to enter the notch tube 7 .

[0071] 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.

[0072] 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.

[0073] like Figure 9As shown, the width of the non-closed gap is d, 1mm≤d≤20mm, which can both increase wind pressure and increase air volume per unit time. When d is less than 1mm, the air volume per unit time is low, and more airflow accumulates inside the housing 1. When d is greater than 20mm, the airflow is not concentrated when it is blown out of the first air outlet 5, resulting in low hair drying efficiency. Furthermore, 5mm≤d≤10mm, with d=8mm being preferred. The width of the non-closed gap is d and the length is L, 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, when the length L is constant, the air volume per unit time is small, and more airflow accumulates inside the shell 1. When the width d is constant, the volume of the whole machine will become larger, which is not beautiful and difficult to store; when d / L>0.5, when the length L is constant, the airflow in the shell 1 can be blown out quickly from the first air outlet 5, but the wind pressure is small, which is not conducive to blowing away wet hair. When the width d is constant, it is not conducive to blowing out the airflow in the shell 1, so that the airflow accumulates inside the shell 1, and the air volume is lost. The width d refers to the line connecting the two points on the non-closed gap that are farthest apart from the perpendicular line to the center line of the non-closed gap when the non-closed gap is sectioned in the direction perpendicular to the center line of the non-closed gap; the length L refers to the length of the line connecting the center of the starting end and the center of the end end of the non-closed gap. If the line connecting 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).

[0074] The non-closed slit has an open portion 13. The central angle β of the open portion 13 is 15°≤β≤180°. This advantageously reduces the wind pressure reaching the hair, allowing the airflow to be promptly blown out of the housing 1 without causing significant loss of wind pressure. When β is less than 15°, the wind pressure reduction effect is insignificant, and the hair may become messy. If the hair is blown at the roots for a long time to dry the hair, the roots may be oriented in an undesirable direction. When β is greater than 180°, the first air outlet 5 is too small, causing airflow to accumulate inside the housing 1 and be promptly blown out of the first air outlet 5, resulting in air volume loss. The central angle β is the angle formed by the line connecting the two ends of the open portion 13 (i.e., the starting and ending ends of the non-closed slit) and the center of the non-closed slit. If the ends of the open portion 13 have a certain width or the ends are irregularly shaped, the central angle β is the angle formed by the two lines at the ends that have the shortest length from the center of the non-closed slit. Furthermore, 15° ≤ β ≤ 90°, preferably β = 45°. The center angle β refers to the angle formed by the two longest lines from the open end 12 to the centerline of the non-closed slit. The centerline of the non-closed slit is aligned with the axis of the notch 701 and the notch barrel 7. The airflow portion of the main air duct is blown out from the open portion 13.

[0075] The width of the non-closed gap is d, and the projection of the open portion 13 along the direction perpendicular to the center line of the non-closed gap has a maximum width d1, 0.1≤d / d1≤1, which has the advantage that the open portion 13 can not only reduce the overall wind pressure, but also blow out the airflow of the main air duct in time to prevent the airflow from accumulating inside the shell 1 and causing air volume loss; when d / d1<0.1, the open portion 13 is too large, the wind pressure loss is large, which is not conducive to spreading wet hair and reducing drying efficiency; d is too small, and the airflow is easily accumulated inside the shell 1 and causes air volume loss; when d / d1>1, the open portion 13 is too small, the wind pressure reduction effect is not obvious, and the hair is relatively messy after drying; d is too large, which is not conducive to increasing the wind pressure and spreading wet hair.

[0076] The open 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 airflow blown out from the first air outlet 5 and the airflow at the open portion 13 driven by the airflow form a complete circle. According to the distance between the first air outlet 5 and the hair when the user blows the hair, the two airflows will merge into one before reaching the hair, thereby improving the blowing effect.

[0077] The opening 13 is located above the centerline of the housing 1. Given the user's habit of holding the hair dryer while blowing their hair, the area below the centerline of the housing 1 plays a primary role throughout the entire process. The airflow at the opening 13 is primarily driven by the main airflow from the first air outlet 5, resulting in relatively low air volume and pressure. If the user holds the first air outlet 5 close to the hair, the two airflows will reach the hair surface before merging into one. The location of the opening 13 above the centerline of the housing 1 facilitates greater air pressure and airflow directed toward the hair, achieving rapid hair drying.

[0078] The two ends of the open portion 13 are located on both sides of the center line of the handle assembly 2. The two ends of the open portion 13 can be symmetrical or asymmetrical about the two sides of the center line of the handle assembly 2.

[0079] like Figure 9As shown, the non-closed projection is surrounded by multiple curves connected end to end, that is, the non-closed gap is defined by multiple components. Further, a notch tube 7 is provided in the shell 1, and the axial section 6 is defined by the notch tube 7 and the cylindrical wall 8 inside the shell 1, and the non-closed gap is defined by the notch tube 7 and the cylindrical wall 8. The notch 701 extends along the axial direction of the shell 1, and the notch 701 can extend from the upstream end of the notch tube 7 to its downstream, or from the downstream end of the notch tube 7 to its upstream. One example of a non-closed gap is that the cylindrical wall 8 is provided with an extension portion 14 extending downward, and the extension portion 14 closes part of the gap between the notch tube 7 and the cylindrical wall 8 to form the non-closed gap. In one case, the gap between the notch tube 7 and the cylindrical wall 8 is annular, and the extension portion 14 closes a part of the annular gap to obtain the non-closed gap. The extension portion 14 abuts against the outer wall of the notch tube 7, and the open portion 13 is the extension portion 14 shown. The non-closed gap is in a C-shaped, U-shaped or other similar shape; in another case, Figure 10 As shown, the notch 701 is provided at the front end of the notch tube 7, and the extension 14 closes at least a portion of the notch 701. The non-closed gap is in a C-shaped, U-shaped, or other similar shape. Furthermore, the notch 701 extends backward from the front end of the notch tube 7, and the ratio of the length of the notch 701 to the length of the notch tube 7 is not less than 1 / 2. The extension 14 closes the notch 701, so that the shape of the airflow in the axial section 6 before reaching the non-closed gap is roughly the same as that of the notch tube 7. The airflow in the axial section 6 is quickly blown out from the first air outlet 5 along the side wall of the extension 14, the side wall of the notch tube 7, and the cylindrical wall 8. The airflow will not accumulate in the housing 1, thereby reducing air volume loss.

[0080] Another example, such as Figure 11 、 12 As shown, the front end of the notched tube 7 is provided with a second notch 15703701 spaced apart from the notch 701. The extension 14 closes the second notch 15703701 to form the non-closed gap. The non-closed gap has an opening 13, which 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 coaxial, which has the advantage of reducing air loss.

[0081] Another example, such as 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 blocking member 171 located in the middle and an outer ring 172 located on the outside. The outer ring 172 and the blocking member 171 are connected by ribs 173. The non-closed gap is defined by the outer ring 172 and the blocking member 171. Alternatively, the housing 1 is further provided with an inner cylinder, and the air outlet member 17 is mounted on the inner cylinder.

[0082] In another example, a barrier 171 is provided in the cylindrical wall 8 , the barrier 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 171 .

[0083] It can be understood that the airflow in the axial section 6 includes an annular airflow before reaching the non-closed gap, and the annular airflow is blown out from the non-closed gap; in this case, an inner cylinder is provided in the outer shell 1, and the annular airflow is limited by the outer wall of the inner cylinder and the cylindrical wall 8 inside the outer shell 1.

[0084] like Figure 14 As shown, the projection of the non-closed gap is enclosed by a single closed curve, i.e., the non-closed gap is defined by a single member. More specifically, a non-closed duct 18 is provided within the housing 1. 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. The airflow in the axial section 6 includes airflow having the same shape as the non-closed gap before reaching the non-closed gap, and this airflow is blown out from the non-closed gap.

[0085] like Figures 1 to 15 As shown, the heating unit 3 is disposed in the axial section 6 and includes a notched tube 7 having a notch 701 extending along its axial direction. The notched tube 7 and the cylindrical wall 8 inside the housing 1 define the axial section 6. The notched tube 7 allows the airflow to be temporarily gathered inside the housing 1, allowing sufficient time for the airflow and the heating unit 3 to transfer heat before being blown out from the first air outlet 5 driven by other airflows, thus preventing the heating wire 302 from turning red and making it safer to use.

[0086] In one example, the ratio of the length of the notch 701 to the length of the notch tube 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. Furthermore, the length of the notch 701 is not less than 2 / 3 of the length of the notch tube 7. The heating unit 3 also includes a plurality of mica sheets 301 mounted on the notch tube 7 and a heating wire 302 wound on the plurality of mica sheets 301, and the plurality of mica sheets 301 are at least arranged on both sides of the notch 701; further, the plurality of mica sheets 301 are evenly spaced along the axial direction of the notch tube 7. The heating wire 302 surrounds the entire circle; or the heating wire 302 is only wound above the mounting bracket, and the notch 701 is open.

[0087] 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.

[0088] In another example, the notched cylinder 7 is a ceramic heating device.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] The rear end of the mica sheet 301 has a slot, and the slot abuts against the periphery of the second portion 20 .

[0094] 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.

[0095] like Figures 1 to 18 As shown, 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;

[0096] The fan unit is used to draw air from the first air inlet 4 into the hair dryer 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;

[0097] The fan unit includes fan blades and a motor for driving the fan blades to rotate;

[0098] The hair dryer also includes an auxiliary air duct 22 extending around the axial section 6. At least part of the airflow in the auxiliary air duct 22 is mixed with at least part of the airflow in the axial section 6 within the housing 1 before being blown out. If the two airflows are first blown out independently and then mixed outside the housing 1, then if the first air outlet 5 is not far enough from the hair surface, the two airflows will reach the hair without mixing, and the force felt in the same area will vary. Due to the difference in air volume and force of the two airflows, some hair in the same area may be dried while others may not. The airflow in the auxiliary air duct 22 is cold, and the airflow in the axial section 6 is hot. The two airflows are mixed before being blown out, preventing the formation of hot spots and ensuring that the same area of ​​the scalp will not feel hot when blown for an extended period of time. When the airflow in the auxiliary air duct 22 is of the same nature, the two airflows are mixed in the outer shell 1 so that when the airflow reaches the hair, no matter how far away it is from the first air outlet 5, the force felt in the same area is not much different, and the hair in the same area will be dried at the same time. You can move the hair dryer to blow the hair in other areas, or you can blow it back and forth without drying it first according to your personal habits. The hair in the entire area will be dried almost at the same time, the dried hair will not be blown repeatedly, the proportion of wet hair will not be large, and the probability of hair damage will be reduced.

[0099] like Figure 16 、 17 As shown, the auxiliary air duct 22 includes an inlet section 2201 and an outlet section 2202. At the inlet section 2201, the airflow of the axial section 6 and the airflow of 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 in the housing 1. The inner cylinder separates the airflow drawn into the interior of the housing 1 by the fan unit into the auxiliary air duct 22 and the main air duct (in this example, the axial section 6 of the main air duct). The inlet section 2201 is defined by the outer wall of the inner cylinder and the inner wall of the housing 1. The axial section 6 is defined by the inner wall of the inner cylinder. The airflows of the two air ducts are first independent of each other, then mixed inside 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 it can be another outlet provided separately.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] The main air duct includes an axial section 6 extending along the axis of the housing 1. The housing 1 is provided with an inner cylinder, and the axial section 6 is at least defined by the inner cylinder. The hair dryer also 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. The inner cylinder is provided with a reversing passage 25. The airflow of the auxiliary air duct 22 is redirected by the reversing passage 25 and mixed with the airflow of the axial section 6 before being blown out. The reversing passage 25 is a channel provided on the inner cylinder.

[0105] The inner cylinder is provided with an inclined air guide surface 26 that directs airflow from the auxiliary air duct 22 into the reversing passage 25. The provision of the inclined air guide surface 26 reduces airflow loss caused by airflow entering the reversing passage 25. The inclined air guide surface 26 extends along the axis of the housing 1 from upstream to downstream. The centerline of the reversing passage 25 forms an angle with the centerline of the axial section 6, and this angle is no greater than 90°. This advantage is that after the airflow changes direction through the reversing passage 25, the force acting on the axially directed airflow is reduced, thereby minimizing wind loss. When the angle is greater than 90°, the airflow passing through the reversing passage 25 exerts an opposing force on the axially forward airflow, reducing the wind force reaching the hair surface, hindering the drying of wet hair and reducing drying efficiency. Furthermore, if the angle is no less than 10°, the airflow is mixed over a shorter path, minimizing airflow loss. If the angle is less than 10°, the airflow must travel a longer path to achieve mixing, resulting in airflow loss and reduced mixing efficiency and wind speed. In this example, the center line of the reversing passage 25 forms an angle of 90° with the center line of the axial section 6; further, the angle formed by the wind guide slope 26 and the center line of the reversing passage 25 is γ, 10°≤γ≤60°, the advantage of which 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°, the airflow will cause air volume loss at the corner of the wind guide slope 26 and the reversing passage 25; when γ<10°, the airflow is likely to cause air volume loss when entering the reversing passage 25 through the wind guide slope 26; the airflow in the wind guide passage preferably has γ=30°.

[0106] The airflow in the auxiliary air duct 22 changes direction through the reversing passage 25, spatially intersecting with the airflow in the axial section 6. In this example, the reversing passage 25 has a certain length and width, and the airflow in the reversing passage 25 is independent of the airflow in the axial section 6. More specifically, the airflow in the reversing passage 25 is independent of the airflow extending along the centerline of the axial section 6.

[0107] 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.

[0108] 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 sidewall 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.

[0109] 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.

[0110] 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; the fan unit is used to draw air from the air inlet into the hair dryer and blow it out from the air outlet to form a main air duct, and the heating unit is used to heat the air; the fan unit comprises blades and a motor for driving the blades to rotate; characterized in that: The main air duct includes an axial section extending along the axial direction of the outer shell, and a notch tube with a notch is provided in the outer shell. The outer side wall of the notch tube and the cylindrical wall inside the outer shell define the axial section. The notch extends along the axial direction of the notch tube, and the ratio of the length of the notch to the length of the notch tube is not less than 1 / 2. The notch tube allows the airflow of the axial section to converge at the notch to increase the air storage volume of the axial section.

2. The hair dryer according to claim 1, characterized in that A communication port is formed at the connection between the handle assembly and the shell to connect the two, and the notch extends to the upstream side of the communication port.

3. The hair dryer according to claim 2, characterized in that A communication port is formed at the connection between the handle assembly and the housing to connect the two, and the gap extends to / over the downstream side of the communication port; or the gap extends to between the upstream side and the downstream side of the communication port.

4. The hair dryer according to claim 3, characterized in that The communicating port and the notch are staggered.

5. The hair dryer according to claim 1, characterized in that The notch is located above the axis of the housing.

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

7. The hair dryer according to claim 6, characterized in that The front end of the notch tube is provided with an auxiliary air outlet, and the air flow in the notch tube 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 the handle assembly. The connection between the handle assembly and the housing defines an air flow inlet for air to enter the axial section from the vertical section. The notch is staggered with the air flow inlet.

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

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