Air duct assembly, air blowing device and electric hair drier

Abstract

The utility model relates to an air duct assembly, an air blowing device and an electric hair drier. The air duct assembly is provided with a first air inlet and an air outlet. The air duct assembly is provided with a first channel, a first steering channel, a second channel, a second steering channel and a third channel. The first air inlet, the first channel, the first steering channel, the second channel, the second steering channel, the third channel and the air outlet are sequentially communicated; the first channel is used for conveying fluid to the first steering channel in the first direction. The first steering channel is used for steering the fluid entering the first channel to a second direction and entering the second channel; the second channel is used for guiding the fluid to the second steering channel along a second direction; the second steering channel is used for steering the fluid output by the second channel to a third direction and entering the third channel; the third channel is used for guiding fluid to the air outlet. According to the air duct assembly, the first turning channel and the second turning channel are turned twice, and miniaturization design is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of hair dryers, in particular to an air duct component, a hair dryer and a hair dryer. Background Art

[0002] As people's living standards continue to improve, their demands for daily electronic products, especially personal care products such as hair dryers, are gradually shifting from single functionality to diversification, personalization, and portability. While current hair dryers can meet basic hair drying needs, they suffer from significant shortcomings in terms of size, weight, and portability, making them unsuitable for use in situations requiring portability. This is especially true for travel, business trips, and other occasions where frequent carrying of a hair dryer is necessary. The bulk of existing hair dryers has become a significant burden for users. Summary of the Invention

[0003] Based on this, it is necessary to provide an air duct assembly, a blowing device and a hair dryer to address the problem that hair dryers in related technologies are difficult to achieve miniaturized design due to internal structural problems.

[0004] One aspect of the present application provides an air duct assembly, which is provided with a first air inlet and an air outlet; the air duct assembly is provided with a first channel, a first turning channel, a second channel, a second turning channel and a third channel; the first air inlet, the first channel, the first turning channel, the second channel, the second turning channel, the third channel and the air outlet are connected in sequence; the first channel is used to transport the fluid along the first direction to the first turning channel; the first turning channel is used to turn the fluid entering the first channel to the second direction and enter the second channel; the second channel is used to guide the fluid along the second direction to the second turning channel; the second turning channel is used to divert the fluid output from the second channel to the third direction and enter the third channel; the third channel is used to guide the fluid to the air outlet.

[0005] The first and second turning channels in the duct assembly effectively direct the fluid from an initial first direction to a final third direction through two turns, eliminating the need for a traditional long, straight flow path. This turning design significantly reduces the length and space requirements of the duct assembly, thereby achieving miniaturization.

[0006] Furthermore, from the first air inlet to the air outlet, the fluid passes through a continuous flow channel structure consisting of a first channel, a first turning channel, a second channel, a second turning channel, and a third channel, ensuring efficient and continuous fluid flow. This allows for a compact structure of the air duct assembly, reducing unnecessary space occupation, lowering flow resistance, and improving fluid transmission efficiency.

[0007] The air duct assembly disclosed in this application achieves significant improvements in miniaturization and compactness while maintaining high performance through a rational flow channel layout and steering design. This optimized layout makes the air duct assembly easier to integrate into various devices or systems. For example, when the air duct assembly is applied to a hair dryer, it can make the hair dryer's structure more compact and facilitate the miniaturization of the hair dryer.

[0008] In one embodiment, the first direction is opposite to the second direction. When the first direction is opposite to the second direction, this means that the flow direction of the fluid changes 180 degrees before and after entering the first turning channel. Since no additional complex turning structure is required to achieve the direction change, it not only simplifies the structure within the flow channel but also further promotes the miniaturization and compactness of the air duct assembly.

[0009] Furthermore, the opposite direction of flow can make the duct assembly more compact in the vertical or horizontal direction. For example, if the first channel is horizontal and the second channel is vertical, then the 180-degree turn can make full use of the vertical space, thereby improving the overall flow channel length and performance without increasing the horizontal size. Moreover, because the first direction is opposite to the second direction, the duct assembly can be flexibly arranged in different installation environments. For example, if space is limited, the duct assembly can be designed in a "U" or "Z" shape to suit specific installation requirements.

[0010] In one embodiment, the third direction is opposite to the second direction. When the third direction is opposite to the second direction, the fluid undergoes a 180-degree flow change after flowing through the second channel and entering the second diverting channel. This design allows the air duct assembly to achieve multiple diversions within a limited space without requiring additional long flow channels, significantly improving the compactness of the air duct assembly and making it more suitable for integration into miniaturized hair dryers.

[0011] In one embodiment, the third direction intersects the second direction. Similarly, when the first direction intersects the second direction, the fluid can be allowed to change direction within a limited space without requiring an excessively long straight flow path, thereby reducing the overall size of the air duct assembly and improving its compactness.

[0012] In one embodiment, the third direction intersects the second direction. When the third direction intersects the second direction, the fluid can be allowed to change direction within a limited space without requiring an excessively long straight flow path, thereby reducing the overall size of the duct assembly and improving its compactness.

[0013] Moreover, the angle between the third direction and the second direction, or the angle between the first direction and the second direction, can be adjusted according to actual needs to achieve optimal fluid transmission effect and space utilization.

[0014] In one embodiment, the cross-sectional boundaries of the first and / or second turning channels are a combination of one or more of an arc, a parabola, a partial ellipse, a hyperbola, and a straight line. The use of arcs, parabolas, partial ellipses, or hyperbolic cross-sectional designs can smooth the flow of fluid in the turning channels, reducing collision and friction between the fluid and the walls, thereby lowering fluid resistance. This helps improve fluid transfer efficiency and reduces energy loss due to resistance.

[0015] Furthermore, the arc-shaped or curved cross-sectional boundary design helps guide the fluid to be evenly distributed during diversion, reducing the formation of dead zones and vortices. This ensures that the fluid maintains a stable flow state as it passes through the diversion channel, improving the stability and reliability of fluid transmission. After passing through the arc, parabola, elliptical section, or hyperbola, the airflow can then flow in a straight line, completing the diversion process.

[0016] In some other embodiments, the cross-sectional boundaries of the first and / or second turning channels are curved. Curved turning channels help guide fluids to change direction smoothly, reducing direct collision and friction between the fluid and the wall. This design can significantly reduce resistance generated by the fluid during the turning process, thereby improving fluid transmission efficiency and reducing energy loss.

[0017] One aspect of the present application provides an air duct assembly, including a first shell, the first shell being provided with a accommodating cavity and a first opening, the accommodating cavity and the first opening being communicated with each other; a second shell, the second shell being nested and arranged on the outside of the first shell, the second shell being provided with a second opening and an air outlet at both axial ends, the second opening having the same opening direction as the first opening; a third shell, the third shell being provided with a first air inlet, the third shell cover being provided at the second opening, the third shell at least partially extending into the accommodating cavity, wherein a first air passage is enclosed between the inner side of the first shell and the third shell, a third channel is enclosed between the outer side of the first shell and the second shell, and the first air passage and the third channel are communicated with each other through the first opening, so that the air duct assembly draws air from the first air inlet and exhausts air along the air outlet.

[0018] The first aspect of the present application provides a wind channel assembly. The second shell is nested outside the first shell, the first opening of the first shell is in the same direction as the second opening of the second shell, so that the second wind channel is formed between the outside of the first shell and the second shell. Further, the third shell is inserted into the accommodating cavity, and the third shell covers the second opening, so that the first wind channel is formed between the third shell and the inside of the first shell. When external air enters the accommodating cavity of the second shell through the first air inlet, it can first flow along the first wind channel and then flow to the outside of the second wind channel, and then be discharged through the air outlet. Therefore, the air flow path is improved. The wind channel assembly disclosed in the present application can form the first wind channel and the second wind channel on the inside and outside of the first shell by nesting the first shell and the second shell inside and outside, and inserting the third shell into the cavity of the first shell. The cooperation of the first shell, the second shell and the third shell not only makes the structure of the whole wind channel assembly more compact, but also fully utilizes the space in the wind channel assembly. The air flow path formed between these shell pieces is winding. The application in the electric hair dryer is beneficial to the miniaturization design of the electric hair dryer.

[0019] Specifically, the first wind inlet and the air outlet are respectively arranged on the axial ends of the wind channel assembly composed of the first shell, the second shell and the third shell. This is beneficial to further prolong the air flow path.

[0020] In one embodiment, the first shell and the second shell are integrally formed.

[0021] In one embodiment, the first shell and the third shell are integrally formed.

[0022] In one embodiment, the second shell and the third shell are integrally formed.

[0023] In one embodiment, an axial end of the third housing extending into the first housing is spaced apart from the first housing to form a first turning channel. A first channel connected to the first air inlet is provided within the third housing, and the first turning channel connects the first channel with the first air passage. Specifically, the third housing has two axial ends, and an axial end of the third housing extending into the first housing is spaced apart from the inner surface of the bottom of the first housing, thereby forming the first turning channel. This allows airflow entering the third housing through the first air inlet to flow along the first channel, then through the first turning channel, and finally to the first air passage. The first turning channel allows the airflow to smoothly transition before entering the first air passage, further reducing turbulence and resistance, thereby improving airflow efficiency and stability. Furthermore, since the resistance caused by the change in flow direction is reduced when the airflow passes through the first turning channel, this helps improve the energy efficiency of the entire air duct assembly and facilitates the passage of air at a higher velocity.

[0024] In one embodiment, a second turning channel is formed between one end of the first shell provided with the first opening and the other axial end of the third shell, and the second turning channel connects the first air passage and the third channel. Specifically, the other axial end cover of the third shell is provided at the second opening of the second shell, and the end of the first shell provided with the first opening is arranged opposite to the radial extension provided at the other axial end of the third shell, thereby forming a second turning channel. Furthermore, the second turning channel can connect the first air passage and the third channel, which are arranged inside and outside. In this way, air passing through the first air passage can first flow through the second turning channel and then flow along the direction of the third channel to the air outlet of the second shell. The airflow can achieve a smooth transition when flowing through the second turning channel, thereby further reducing turbulence and resistance, and improving the efficiency and stability of the airflow. On the other hand, since the airflow can reduce the resistance caused by the change in flow direction when passing through the second turning channel, it helps to improve the energy efficiency of the entire air duct assembly and facilitates the passage of air at a higher speed.

[0025] In one of the embodiments, the first shell comprises a first shell body and a cover part, the cover part is arranged on one axial end of the first shell body, the first shell body and the cover part form the accommodating cavity, the other axial end of the first shell body is provided with the first opening, the third shell extends into the accommodating cavity through the first opening, the first shell has an inner surface and an outer surface arranged oppositely, the inner surface of the first shell body and the third shell form the first air passing channel, and the outer surface of the first shell body and the second shell form the third channel. The combination of the first shell body and the cover part forms the accommodating cavity, the cover part is arranged on one axial end of the first shell body. As shown in detail in Figure 2 the first shell body is a cylinder, the first shell body is provided with the first opening at one axial end, and the third shell is inserted into the accommodating cavity through the first opening. In this way, the cover part can prevent the air flow from flowing out directly along the axial direction of the first shell body, which is conducive to prolonging the air flow path. The third shell located in the accommodating cavity forms the first air passing channel between the inner surface of the first shell body and the second shell forms the third channel between the outer surface of the first shell body and the second shell. In this way, the first air passing channel and the third channel are formed by the arrangement of the first shell body, and the first air passing channel and the third channel are connected through the second opening of the first shell body. In this way, the air flow enters the air duct assembly to flow, thereby forming a bending flow path, so as to effectively utilize the space in the air duct assembly and prolong the air flow path.

[0026] In one of the embodiments, the second shell comprises a second shell body and an air outlet part, the air outlet part is arranged on one axial end of the second shell body, the air outlet part is provided with the air outlet, the other axial end of the second shell body is provided with the second opening, the third shell cover is arranged on the second opening and connected with the second shell body, and the outer side of the first shell and the inner surface of the second shell body form the third channel. Further, the air outlet part is arranged on one axial end of the second shell body, the air outlet part is provided with the air outlet to make the air flow out. The other axial end of the second shell body is provided with the second opening, the third shell cover is arranged on the second opening and connected with the second shell, so as to avoid forming the air inlet on the other axial end of the second shell body, and the air flow can only enter through the first air inlet of the third shell cover and flow along the detour channel formed by the first air passing channel and the third channel.

[0027] In detail, the second shell body is cylindrical, the air outlet portion covers one axial end of the second shell body, and the air outlet opened by the air outlet portion is arranged along the edge near the connection between the air outlet portion and the second shell body, so that the airflow of the third channel can be discharged more smoothly and directly through the air outlet.

[0028] In one embodiment, the third shell includes a third shell body and a radial extension portion, the radial extension portion is arranged on one axial end of the third shell body and is raised relative to the surface of the third shell body, the radial extension portion is nested on the second shell body to block the second opening, the third shell body forms a through first channel, so that the first air inlet is formed on one axial end of the third shell body, the other axial end of the third shell body is inserted into the accommodating cavity, and the third shell body and the inner side of the first shell are enclosed to form the first air passage. The through first channel is formed by the third shell body, so that the first air inlet is formed on one axial end of the third shell body, and the other axial end of the third shell body is inserted into the accommodating cavity, so that the air flow can directly enter the first shell through the through first channel, thereby optimizing the air entry path, reducing the resistance of the air flow, and improving the suction efficiency of the hair dryer. The radial extension portion is arranged on one axial end of the third shell body and is protruded relative to the surface of the third shell body. The radial extension portion extends from the surface of the third shell body toward the second shell body and is nested on the second shell body to block the second opening, so that the axial end of the third shell body can only enter the air duct assembly through the first air inlet, which is beneficial to extend the flow path of the airflow in the air duct assembly.

[0029] In one embodiment, a sealing ring is further included, which is sleeved on the radial extension portion and abuts between the radial extension portion and the second shell to seal the gap between the radial extension portion and the second shell. By sleeved on the radial extension portion and abutting between the radial extension portion and the second shell, the gap between the radial extension portion and the second shell can be effectively sealed, thereby significantly enhancing the sealing performance of the entire air duct assembly, preventing air leakage during flow, ensuring that the hair dryer can generate a stable airflow, and at the same time allowing one axial end of the third shell body to enter the air duct assembly only through the first air inlet, thereby facilitating the extension of the airflow path within the air duct assembly. On the other hand, the sealing ring can fit tightly between the radial extension portion and the second shell, absorbing and reducing vibration to a certain extent, thereby reducing noise levels and improving user comfort.

[0030] In one embodiment, one of the radial extension portion and the second shell is provided with a limiting rib, and the other of the radial extension portion and the second shell is provided with a limiting groove, and the limiting rib is adapted to the limiting groove. By providing the limiting rib to be adapted to the limiting groove, the radial extension portion and the second shell can be accurately aligned during assembly and firmly connected together. In some specific embodiments, the radial extension portion is provided with a limiting rib, and the second shell is provided with a limiting groove. In detail, a limiting rib adapted to the limiting groove is provided on the outer surface of the radial extension portion, and a limiting groove is provided on the inner wall or edge of the second shell. This connection structure is simple and effective, can improve the assembly efficiency of the air duct assembly, and can also enhance the stability and reliability of its structure.

[0031] In one embodiment, the first channel of the third housing is used to mount a fan. By installing the fan within the first channel of the third housing, the fan and duct assembly are tightly integrated. Specifically, the fan is installed within the first channel, allowing the third housing to draw air directly through the first air inlet, then circulate along the winding path formed by the first air passage and the third channel within the duct housing, and finally blown out through the air outlet on the second housing, thereby extending the airflow path within a compact space.

[0032] In one embodiment, a heating component is further included, and the heating component is installed in the first air passage or the third passage. By adding a heating component to the air duct assembly, the heating component can be used to heat the airflow flowing through the first air passage or the third passage, so that the temperature of the airflow at the air outlet increases. Furthermore, the heating component is arranged in the first air passage or the third passage, which can make the overall structure of the air duct assembly more compact, fully utilize the space in the air duct assembly, and facilitate the miniaturization design of the hair dryer. Specifically, the heating component is arranged in the third passage to achieve better heating efficiency.

[0033] In one embodiment, the heating element further comprises a mounting bracket disposed on the first housing or the second housing, the mounting bracket being located within the third passage, and being used to mount the heating element. The mounting bracket securely secures the heating element within the third passage, thereby reducing performance degradation and safety risks associated with vibration or movement of the duct assembly during use.

[0034] In one of the embodiments, the mounting bracket comprises a plurality of support members, the heating assembly is arranged on the support members, the support members are arranged at intervals along the outer surface of the first shell, the first shell is provided with a clamping groove, and the support members are provided with a protruding rib which is at least partially located in the clamping groove. The support members are arranged at intervals along the outer surface of the first shell, so that the heating assembly can be arranged in a distributed manner along the outer surface of the first shell, thereby facilitating uniform heating of the third channel and improving the temperature stability performance at the air outlet. The support members provide a stable support structure for the heating assembly, so that the position of the heating assembly in the air duct assembly is fixed, reducing the risk of displacement or damage caused by vibration or impact. Further, the clamping groove provided on the first shell matches the protruding rib on the support members, so that the support members can be easily mounted on the first shell and ensure the accuracy of their position, facilitating the simplification of the installation process and improving the production efficiency. In addition, by designing the mounting bracket to consist of a plurality of support members, the mounting bracket is more flexible, and the number of support members can be increased or decreased as needed to adapt to heating assemblies of different sizes and weights.

[0035] In more detail, the heating assembly uses heating wires, which can be arranged around each support member to uniformly heat the third channel.

[0036] In one of the embodiments, a heat insulating member is further included, which is nested in the second shell and located between the heating assembly and the second shell. By arranging the heat insulating member, the heat generated by the heating assembly can be effectively isolated from direct contact with the second shell. This design reduces the temperature of the second shell, reduces the loss of heat to the external environment, and improves the utilization efficiency of heat energy. Further, as the loss of heat to the outside is reduced, when the air duct assembly is applied to a hair dryer, the heat insulating member can also prevent the air outlet from overheating, reducing the risk of burning the user. In detail, the heat insulating member is in the form of a cylindrical portion, and the outer portion of the second shell is wrapped in the inner cavity of the cylindrical portion.

[0037] The second aspect of the present application provides a hair dryer, comprising: an outer shell provided with a second air inlet and a mounting cavity; an air duct assembly according to any one of the above embodiments, arranged on the outer shell and at least partially located in the mounting cavity; and a fan arranged on the third shell and located in the first channel of the third shell, the fan being used to draw air into the outer shell from the second air inlet and discharge air from the air outlet of the third shell.

[0038] The second aspect of the present application provides a blowing device, wherein the mounting cavity provided on the outer shell can be used to install the air duct assembly, and the outer shell is provided with a second air inlet, which cooperates with the air duct assembly to allow sufficient air to enter the interior of the device. Compared with the related art in which the fan is provided separately, the present application saves space for installing the fan by providing the fan in the first channel of the third shell of the air duct assembly, thereby greatly reducing the axial length of the blowing device, reducing the size of the entire blowing device, and realizing a miniaturized design. Furthermore, a first air passage and a third channel are provided on the air duct assembly to form a circuitous airflow path, and a heating component can be provided in the first air passage or the third channel, thereby facilitating efficient and uniform heating of the airflow.

[0039] A second aspect of the present application provides a hair dryer comprising a handle assembly; a hair dryer as described in any of the above embodiments, wherein the handle assembly is disposed on the hair dryer. The handle assembly provides a user with convenient grip and operation of the hair dryer, allowing the user to grip and operate the hair dryer comfortably. Using the hair dryer in any of the above embodiments can further miniaturize the overall design of the hair dryer, improving its portability and ease of storage and use.

[0040] In one embodiment, an opening is provided at the connection between the blowing device and the handle assembly, which is connected to the first air inlet of the air duct assembly. The handle assembly is provided with a third air inlet, and a circuit board assembly is provided in the handle assembly. The third air inlet is connected to the opening so that air is sucked along the third air inlet and passes through the circuit board assembly. By providing an opening at the connection between the blowing device and the handle assembly, which is connected to the first air inlet of the air duct assembly, air can pass through the third air inlet of the handle assembly and enter the handle assembly. In this process, the airflow passing through the circuit board assembly can carry away the heat generated by its operation, thereby achieving a heat dissipation function for the circuit board assembly, helping to reduce the temperature of the circuit board assembly and improving its stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is one of the three-dimensional views of a hair dryer according to an embodiment of the present application;

[0042] Figure 2 This is a second perspective view of a hair dryer according to an embodiment of the present application;

[0043] Figure 3 is a cross-sectional view of a hair dryer according to an embodiment of the present application;

[0044] Figure 4 This is one of the three-dimensional views of the air duct assembly according to one embodiment of the present application;

[0045] Figure 5This is a second perspective view of the air duct assembly according to an embodiment of the present application;

[0046] Figure 6 is a cross-sectional view of an air duct assembly according to an embodiment of the present application;

[0047] Figure 7 An exploded view of an air duct assembly according to an embodiment of the present application;

[0048] Figure 8 An exploded cross-sectional view of an air duct assembly according to an embodiment of the present application;

[0049] Figure 9 This is a three-dimensional schematic diagram of a first housing according to an embodiment of the present application;

[0050] Figure 10 This is one of the three-dimensional schematic diagrams of the second housing according to an embodiment of the present application;

[0051] Figure 11 This is a second perspective schematic diagram of the second housing according to an embodiment of the present application;

[0052] Figure 12 This is a schematic three-dimensional diagram of a third housing according to an embodiment of the present application;

[0053] The corresponding relationship between the reference numerals and component names is as follows:

[0054] 100 air duct components;

[0055] 1 first shell, 101 accommodating cavity, 102 first opening, 103 second channel, 104 third channel, 105 slot, 106 first turning channel, 107 second turning channel, 11 first shell body, 12 shielding portion;

[0056] 2 second shell, 201 second opening, 202 air outlet, 203 limiting groove, 21 second shell body, 22 air outlet;

[0057] 3 third shell, 301 first air inlet, 302 first channel, 31 third shell body, 32 radial extension portion, 33 limiting rib;

[0058] 4 sealing rings;

[0059] 5. Heating component;

[0060] 6 support members;

[0061] 7. Thermal insulation;

[0062] 300 outer shell, 3001 second air inlet;

[0063] 400 fans;

[0064] 500 handle assembly, 5001 opening, 5002 third air inlet. DETAILED DESCRIPTION

[0065] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0066] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0067] The air duct assembly 100, the blowing device 200 and the hair dryer according to some embodiments of the present invention will be described below with reference to the accompanying drawings.

[0068] Example 1

[0069] Please see the attached Figure 4 To the attached Figure 6 One aspect of the present application provides an air duct assembly, which is provided with a first air inlet 301 and an air outlet 202; the air duct assembly is provided with a first channel 302, a first turning channel 106, a second channel 103, a second turning channel 107 and a third channel 104; the first air inlet 301, the first channel 302, the first turning channel 106, the second channel 103, the second turning channel 107, the third channel 104 and the air outlet 202 are connected in sequence; the first channel 302 is used to transport the fluid along the first direction to the first turning channel 106; the first turning channel 106 is used to turn the fluid entering the first channel 302 to the second direction and enter the second channel 103; the second channel 103 is used to guide the fluid along the second direction to the second turning channel 107; the second turning channel 107 is used to turn the fluid output from the second channel 103 to the third direction and enter the third channel 104; the third channel 104 is used to guide the fluid to the air outlet 202.

[0070] The first and second turning channels 106, 107 in the air duct assembly effectively direct the fluid from an initial first direction to a final third direction through two turns, eliminating the need for a traditional long, straight flow channel. This turning design significantly reduces the length and space requirements of the air duct assembly, thereby achieving miniaturization.

[0071] Furthermore, from the first air inlet 301 to the air outlet 202, the fluid passes through the continuous flow channel structure of the first channel 302, the first turning channel 106, the second channel 103, the second turning channel 107, and the third channel 104, ensuring efficient and continuous fluid flow. This can make the structure of the air duct assembly compact, reduce unnecessary space occupation, and also reduce flow resistance, thereby improving fluid transmission efficiency.

[0072] The air duct assembly disclosed in this application achieves significant improvements in miniaturization and compactness while maintaining high performance through a rational flow channel layout and steering design. This optimized layout makes the air duct assembly easier to integrate into various devices or systems. For example, when the air duct assembly is applied to a hair dryer, it can make the hair dryer's structure more compact and facilitate the miniaturization of the hair dryer.

[0073] In one embodiment, the first direction is opposite to the second direction. When the first direction is opposite to the second direction, this means that the flow direction of the fluid changes 180 degrees before and after entering the first turning channel 106. Since no additional complex turning structure is required to achieve the direction change, the structure within the flow channel can be simplified and the miniaturization and compactness of the air duct assembly can be further promoted.

[0074] Please see the attached Figure 6 , in the corresponding channel, the first direction, the second direction and the third direction can be understood with reference to the flow direction of the airflow.

[0075] Furthermore, the opposite directions of flow can make the duct assembly more compact in the vertical or horizontal direction. For example, if the first channel 302 is horizontal and the second channel 103 is vertical, then the 180-degree turn can fully utilize the vertical space, thereby improving the overall flow channel length and performance without increasing the horizontal size. Moreover, because the first direction is opposite to the second direction, the duct assembly can be flexibly arranged in different installation environments. For example, if space is limited, the duct assembly can be designed in a "U" or "Z" shape to suit specific installation requirements.

[0076] In one embodiment, the third direction is opposite to the second direction. When the third direction is opposite to the second direction, the fluid undergoes a 180-degree flow change after flowing through the second channel 103 and entering the second diverting channel 107. This design allows the air duct assembly to achieve multiple diversions within a limited space without requiring additional long flow channels. This significantly improves the compactness of the air duct assembly, making it more suitable for integration into miniaturized hair dryers.

[0077] In one embodiment, the third direction intersects the direction in which the second direction extends. Similarly, when the first direction intersects the second direction, the fluid can be allowed to change direction within a limited space without requiring an excessively long straight flow path, thereby reducing the overall size of the duct assembly and improving the compactness of the duct assembly.

[0078] In one embodiment, the third direction intersects the second direction. When the third direction intersects the second direction, the fluid can be allowed to change direction within a limited space without requiring an excessively long straight flow path, thereby reducing the overall size of the air duct assembly and improving its compactness.

[0079] Moreover, the angle between the third direction and the second direction, or the angle between the first direction and the second direction, can be adjusted according to actual needs to achieve optimal fluid transmission effect and space utilization.

[0080] In one embodiment, the cross-sectional boundaries of the first and / or second diverting channels 106 and 107 along the outlet direction are a combination of one or more of an arc, a parabola, a partial ellipse, a hyperbola, and a straight line. The use of arcs, parabolas, partial ellipses, or hyperbolic cross-sectional designs can smooth the flow of fluid in the diverting channels, reducing collision and friction between the fluid and the walls, thereby lowering fluid resistance. This helps improve fluid transmission efficiency and reduces energy loss due to resistance.

[0081] Furthermore, the arc-shaped or curved cross-sectional boundary design helps guide the fluid to be evenly distributed during diversion, reducing the formation of dead zones and vortices. This ensures that the fluid maintains a stable flow state as it passes through the diversion channel, improving the stability and reliability of fluid transmission. After passing through the arc, parabola, elliptical section, or hyperbola, the airflow can then flow in a straight line, completing the diversion process.

[0082] In some other embodiments, the boundary of the cross section of the first turning channel 106 and / or the second turning channel 107 along the outlet direction is a curve. The turning channel formed by the curve helps to guide the fluid to change direction smoothly, reducing direct collision and friction between the fluid and the wall. This design can significantly reduce the resistance generated by the fluid during the turning process, thereby improving the efficiency of fluid transmission and reducing energy loss.

[0083] Please refer to the attached Figure 3 To the attached Figure 8, this embodiment discloses an air duct assembly 100, comprising a first shell 1, the first shell 1 is provided with a accommodating cavity 101 and a first opening 102, the accommodating cavity 101 and the first opening 102 are communicated; a second shell 2, the second shell 2 is nested and arranged on the outside of the first shell 1, and the second shell 2 is respectively provided with a second opening 201 and an air outlet 202 at both axial ends, and the second opening 201 has the same opening direction as the first opening 102; a third shell 3, the third shell 3 is provided with a first air inlet 301, the third shell 3 is covered at the second opening 201, and the third shell 3 at least partially extends into the accommodating cavity 101, wherein a second channel 103 is enclosed between the inner side of the first shell 1 and the third shell 3, and a third channel 104 is enclosed between the outer side of the first shell 1 and the second shell 2, and the second channel 103 and the third channel 104 are communicated through the first opening 102, so that the air duct assembly 100 takes in air from the first air inlet 301 and discharges air along the air outlet 202.

[0084] The first aspect of the present application provides an air duct assembly 100, which is formed by nesting the second shell 2 on the outside of the first shell 1, and the first opening 102 opened in the first shell 1 and the second opening 201 opened in the second shell 2 in the same direction, so that a second air duct is enclosed between the outside of the first shell 1 and the second shell 2. Furthermore, the third shell 3 is inserted into the accommodating cavity 101, and the third shell 3 is covered at the second opening 201, so that a second channel 103 is enclosed between the third shell 3 and the inner side of the first shell 1. When external air enters the accommodating cavity 101 of the second shell 2 through the first air inlet 301, it can first flow along the second channel 103 to the second air duct on the outside, and then be exhausted through the air outlet 202, thereby improving the airflow path. The air duct assembly 100 disclosed in the present application can form a first air passage and a second air duct on the inner and outer sides of the first shell 1 respectively by nesting the first shell 1 and the second shell 2 inside and outside, and inserting the third shell 3 into the cavity of the first shell 1. The coordinated arrangement of the first shell 1, the second shell 2 and the third shell 3 can not only make the structure of the entire air duct assembly 100 more compact, but also make full use of the space inside the air duct assembly 100. A circuitous air circulation path is formed between these shells, which is beneficial to the miniaturized design of the hair dryer 400 when used in a hair dryer.

[0085] like Figure 6 As shown, specifically, the air duct assembly 100 composed of the first shell 1, the second shell 2 and the third shell 3 is respectively provided with a first air inlet 301 and an air outlet 202 at both axial ends, which is conducive to further extending the air circulation path.

[0086] In addition to the features of the above embodiment, this embodiment further defines that: the first shell 1 and the second shell 2 are integrally formed.

[0087] In addition to the features of the above embodiments, the present embodiment is further defined as: the first shell 1 and the third shell 3 are integrally formed.

[0088] In addition to the features of the above embodiments, the present embodiment is further defined as: the second shell 2 and the third shell 3 are integrally formed.

[0089] As shown in Figure 3 and Figure 6 , one end of the third shell 3 is arranged close to the rear side wall inside the first shell 1, and the end of the third shell 3 is arranged spaced apart from the inner surface of the first shell 1.

[0090] As shown in Figure 3 and Figure 6 , in addition to the features of the above embodiments, the present embodiment is further defined as: the third shell 3 extends to the end inside the first shell 1 and is arranged spaced apart from the first shell 1 to form a first diversion passage 106, and the first shell 3 is provided with a first passage 302 communicating with the first air inlet 301, and the first diversion passage 106 communicates the first passage 302 with the second passage 103.

[0091] Specifically, the third shell 3 has two axial ends, and the axial end of the third shell 3 extends to the end inside the first shell 1 and is arranged spaced apart from the inner surface of the bottom of the first shell 1, thereby forming a first diversion passage 106. In this way, the airflow entering the third shell 3 through the first air inlet 301 can flow along the first passage 302 and then flow through the first diversion passage 106 and then flow to the second passage 103. The first diversion passage 106 can make the airflow smoothly transition before entering the second passage 103, thereby further reducing turbulence and resistance and improving the efficiency and stability of the airflow. On the other hand, since the airflow can reduce the resistance generated by the change of flow direction when passing through the first diversion passage 106, it helps to improve the energy efficiency of the entire air duct assembly and allows the airflow to pass at a higher speed.

[0092] As shown in Figure 6 , the inner surface of the bottom of the first shell 1 is at least partially arc-shaped, and the arc surface of the bottom of the first shell 1 and the third shell 3 form a first diversion passage 106.

[0093] As shown in Figure 3 , Figure 6 and Figure 7 , in addition to the features of the above embodiments, the present embodiment is further defined as: the first shell 1 is provided with a second diversion passage 107 formed between one end of the first opening 102 and the other axial end of the third shell 3, and the second diversion passage 107 communicates the second passage 103 with the third passage 104.

[0094] Specifically, the other axial end cover of the third shell 3 is provided at the second opening of the second shell, and the end of the first shell 1 provided with the first opening 102 is arranged opposite to the radial extension portion 32 provided at the other axial end of the third shell 3, thereby forming a second turning channel 107. Furthermore, the second turning channel 107 can connect the second channel 103 and the third channel 104 provided inside and outside. In this way, the air passing through the second channel 103 can first flow through the second turning channel 107, and then flow along the direction of the third channel 104 to the air outlet 202 of the second shell 2. The airflow can achieve a smooth transition when flowing through the second turning channel 107, thereby further reducing turbulence and resistance, and improving the efficiency and stability of the airflow. On the other hand, since the airflow can reduce the resistance caused by the change of flow direction when passing through the second turning channel 107, it helps to improve the energy efficiency of the entire air duct assembly and facilitates the passage of air at a higher speed.

[0095] Among them, such as Figure 6 As shown, the inner surface of the third shell 3 opposite to the first shell 1 is at least partially curved, and the curved surface of the third shell 3 and the end of the first shell 1 form a second turning channel 107 .

[0096] It can be understood that the airflow directions of the second channel 103 and the third channel 104 are opposite.

[0097] like Figure 6 、 Figure 7 and Figure 8 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the first shell 1 includes a first shell body 11 and a shielding portion 12, the shielding portion 12 being disposed at one axial end of the first shell body 11, a receiving chamber 101 being enclosed between the first shell body 11 and the shielding portion 12, a first opening 102 being provided at the other axial end of the first shell body 11, the third shell 3 extending into the receiving chamber 101 through the first opening 102, the first shell 1 having an inner surface and an outer surface disposed opposite each other, a second channel 103 being enclosed between the inner surface of the first shell body 11 and the third shell 3, and a third channel 104 being enclosed between the outer surface of the first shell body 11 and the second shell 2. The receiving chamber 101 is formed by combining the first shell body 11 and the shielding portion 12, wherein the shielding portion 12 is disposed at one axial end of the first shell body 11.

[0098] In detail, such as Figure 6 、 Figure 7 and Figure 8As shown, the first shell body 11 is cylindrical, and an axial end of the first shell body 11 is provided with a first opening 102, so that the third shell 3 can be inserted into the accommodating cavity 101 through the first opening 102. In this way, the shielding portion 12 can prevent the air flow from flowing out along the axial direction of the first shell body 11 directly, which is conducive to prolonging the air flow path. The portion of the third shell 3 located in the accommodating cavity 101 and the inner surface of the first shell body 11 form a second channel 103, and the outer surface of the first shell body 11 and the second shell 2 enclose a third channel 104. In this way, the second channel 103 and the third channel 104 are spaced apart by the first shell body 11, and the second channel 103 and the third channel 104 can be communicated through the second opening 201 of the first shell body 11. The air flow enters the air duct assembly 100 to flow, thereby forming a bending flow path, so as to effectively utilize the space in the air duct assembly 100 and prolong the air flow path.

[0099] As shown in Figure 6 , Figure 10 and Figure 11 , in addition to the features of the above embodiments, the present embodiment is further limited in that: the second shell 2 comprises a second shell body 21 and an air outlet portion 22, the air outlet portion 22 is arranged on an axial end of the second shell body 21, the air outlet portion 22 is provided with an air outlet 202, an axial other end of the second shell body 21 is provided with a second opening 201, the third shell 3 is arranged on the second opening 201 and connected with the second shell body 21, and the outer side of the first shell 1 and the inner surface of the second shell body 21 form a third channel 104.

[0100] The air outlet portion 22 is arranged on an axial end of the second shell body 21, and the air outlet portion 22 is provided with an air outlet 202 to make the air flow out. An axial other end of the second shell body 21 is provided with a second opening 201, and the third shell is arranged on the second opening 201 and connected with the second shell, so that the axial other end of the second shell body 21 is prevented from forming an air inlet, and the air flow can only enter through the first air inlet 301 of the third shell and flow along the detour channel formed by the second channel 103 and the third channel 104.

[0101] In detail, the second shell body 21 is cylindrical, and the air outlet portion 22 covers an axial end of the second shell body 21. The air outlet 202 of the air outlet portion 22 is arranged along the edge close to the connection between the air outlet portion 22 and the second shell body 21, so that the air flow of the third channel 104 can flow out more smoothly through the air outlet 202.

[0102] As shown in Figure 6 , Figure 7 , Figure 8 and Figure 12 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the third shell 3 includes a third shell body 31 and a radial extension portion 32, the radial extension portion 32 is arranged on one axial end of the third shell body 31, and is convexly arranged relative to the surface of the third shell body 31, the radial extension portion 32 is nested on the second shell 2 to cover the second opening 201, the third shell body 31 forms a penetrating first channel 302, so that a first air inlet 301 is formed on one axial end of the third shell body 31, the other axial end of the third shell body 31 is embedded in the accommodating cavity 101, and the third shell body 31 and the inner side of the first shell 1 enclose a second channel 103. A first through-channel 302 is formed through the third shell body 31, so that a first air inlet 301 is formed on one axial end of the third shell body 31, and the other axial end of the third shell body 31 is embedded in the accommodating cavity 101, so that the air flow can directly enter the first shell through the through-channel 302, thereby optimizing the air entry path, reducing the resistance to air flow, and improving the suction efficiency of the hair dryer.

[0103] Furthermore, a radial extension portion 32 is provided on one axial end of the third shell body 31 and is protruded relative to the surface of the third shell body 31. The radial extension portion 32 extends from the surface of the third shell body 31 toward the second shell 2 and is nested on the second shell 2 to block the second opening 201, so that one axial end of the third shell body 31 can only enter the air duct assembly 100 through the first air inlet 301, thereby facilitating the extension of the flow path of the airflow in the air duct assembly 100.

[0104] like Figure 3 and Figure 5 As shown, in addition to the features of the above-mentioned embodiment, this embodiment is further defined as follows: it also includes a sealing ring 4, which is sleeved on the radial extension portion 32 and abuts between the radial extension portion 32 and the second shell 2 to seal the gap between the radial extension portion 32 and the second shell 2. By sleeved on the radial extension portion 32 and abutting between the radial extension portion 32 and the second shell 2, the gap between the radial extension portion 32 and the second shell 2 can be effectively sealed, thereby significantly enhancing the sealing performance of the entire air duct assembly 100, preventing air leakage during the flow process, ensuring that the hair dryer can generate a stable airflow, and at the same time, one axial end of the third shell body 31 can only enter the air duct assembly 100 through the first air inlet 301, thereby facilitating the extension of the airflow path within the air duct assembly 100.

[0105] On the other hand, the sealing ring 4 can be tightly fitted between the radial extension 32 and the second shell 2, can absorb and reduce vibration to a certain extent, thereby reducing noise level and improving comfort of use.

[0106] As shown in Figure 4 and Figure 12 , in addition to the features of the above-mentioned embodiments, the present embodiment is further limited in that one of the radial extension 32 and the second shell 2 is provided with a limiting rib 33, and the other of the radial extension 32 and the second shell 2 is provided with a limiting groove 203, and the limiting rib 33 is matched with the limiting groove 203. By setting the limiting rib 33 matched with the limiting groove 203, the radial extension 32 and the second shell 2 can be accurately aligned and firmly connected together during assembly.

[0107] In some specific embodiments, the limiting rib 33 is arranged on the radial extension 32, and the limiting groove 203 is arranged on the second shell 2. In detail, the limiting rib 33 matched with the limiting groove 203 is arranged on the outer surface of the radial extension 32, and the limiting groove 203 is arranged on the inner wall or edge of the second shell 2. This connection structure is simple and effective, which can improve the assembly efficiency of the air duct assembly 100, and also can enhance the stability and reliability of the structure.

[0108] As shown in Figure 3 and Figure 6 , in addition to the features of the above-mentioned embodiments, the present embodiment is further limited in that the first channel 302 of the third shell body 31 is used for mounting the fan 400. By mounting the fan 400 in the first channel 302 of the third shell body 31, the fan 400 and the air duct assembly 100 are closely integrated. Specifically, the fan 400 is mounted in the first channel 302, so that the third shell 3 can directly suck air through the first air inlet 301, then flow along the serpentine path formed by the second channel 103 and the third channel 104 in the air duct shell, and finally blow out through the air outlet 202 on the second shell 2, thereby realizing the extension of the airflow passage in a compact space.

[0109] As shown in Figure 3 , in addition to the features of the above-mentioned embodiments, the present embodiment is further limited in that it further comprises a heating assembly 5, and the heating assembly 5 is arranged in the second channel 103 or the third channel 104. By increasing the heating assembly 5 in the air duct assembly 100, the heating assembly 5 can be used to heat the airflow flowing through the second channel 103 or the third channel 104, so that the airflow temperature at the air outlet 202 is increased.

[0110] Furthermore, the heating assembly 5 is disposed in the second channel 103 or the third channel 104, which can make the overall structure of the air duct assembly 100 more compact, fully utilize the space within the air duct assembly 100, and facilitate the miniaturization of the hair dryer. Specifically, the heating assembly 5 is disposed in the third channel 104, which can achieve better heating efficiency.

[0111] like Figure 6 and Figure 7 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines: further comprising a mounting bracket, the mounting bracket being disposed on the first housing 1 or the second housing 2, the mounting bracket being located within the third passage 104, and the mounting bracket being used to mount the heating assembly 5. By providing the mounting bracket, the heating assembly 5 can be securely fixed within the third passage 104, thereby reducing performance degradation or safety risks caused by vibration or movement of the air duct assembly 100 during use.

[0112] like Figure 7 and Figure 9 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the mounting bracket includes a plurality of support members 6, the heating assembly 5 is disposed on the support members 6, the support members 6 are spaced apart along the outer surface of the first housing 1, the first housing 1 is provided with a retaining groove 105, the support members 6 are provided with a rib, and the rib is at least partially located within the retaining groove 105. The support members 6 are spaced apart along the outer surface of the first housing 1, so that the heating assembly 5 can be distributed along the outer surface of the first housing 1, thereby facilitating uniform heating of the third channel 104 and improving temperature stability at the air outlet. The provision of the support members 6 provides a stable support structure for the heating assembly 5, so that the heating assembly 5 can be fixed in position in the air duct assembly 100, reducing the risk of displacement or damage due to vibration or impact.

[0113] Furthermore, the slots 105 provided on the first housing 1 match the ribs on the support member 6, allowing the support member 6 to be easily installed on the first housing 1 and ensuring its accurate positioning, which helps to simplify the installation process and improve production efficiency. In addition, by designing the mounting bracket to be composed of multiple support members 6, the mounting bracket is more flexible, and the number of support members 6 can be increased or decreased as needed to accommodate heating components 5 of different sizes and weights.

[0114] In more detail, the heating assembly 5 uses a heating wire, which can be wound around each support member 6 to perform uniform heating in the third channel 104 .

[0115] like Figure 7 and Figure 8As shown, in addition to the features of the above-mentioned embodiment, this embodiment is further defined as follows: it also includes a heat insulating member 7, the heat insulating member 7 is nested in the second shell 2, and the heat insulating member 7 is located between the heating component 5 and the second shell 2. By providing the heat insulating member 7, the heat generated by the heating component 5 can be effectively isolated from direct contact with the second shell 2. This design lowers the temperature of the second shell 2, reduces the loss of heat to the external environment, and improves the efficiency of thermal energy utilization. Furthermore, since the loss of heat to the outside is reduced, when the air duct assembly 100 is applied to the hair dryer, the heat insulating member 7 can also prevent the air outlet 22 from overheating, reducing the risk of scalding the user. In detail, the heat insulating member 7 is a cylindrical portion, and the outside of the second shell is wrapped in the inner cavity of the cylindrical portion.

[0116] Example 2

[0117] like Figure 3 and Figure 6 As shown, this embodiment discloses a blowing device, including an outer shell 300, an air duct assembly 100 as in any of the above embodiments, and a fan 400, the outer shell 300 is provided with a second air inlet 3001 and an installation cavity; the air duct assembly 100 is arranged on the outer shell 300, and the air duct assembly 100 is at least partially located in the installation cavity; the fan 400 is arranged on the third shell 3, and the fan 400 is located in the first channel 302 of the third shell 3, and the fan 400 is used to make the outer shell 300 suck air from the second air inlet 3001 and exhaust air along the air outlet 202 of the third shell 3.

[0118] The second aspect of the present application provides a blowing device, wherein the mounting cavity provided on the outer shell can be used to install the air duct assembly 100, and the outer shell 300 is provided with a second air inlet 3001, which cooperates with the air duct assembly 100 to allow sufficient air to enter the interior of the device. Compared with the related art in which the fan 400 is provided separately, the present application saves space for installing the fan 400 by providing the fan 400 in the first channel 302 of the third shell 3 of the air duct assembly 100, thereby greatly reducing the axial length of the blowing device, reducing the size of the entire blowing device, and realizing a miniaturized design. Furthermore, the air duct assembly 100 is provided with a second channel 103 and a third channel 104 to form a circuitous airflow path, and a heating component 5 can be provided in the second channel 103 or the third channel 104, which is conducive to forming an efficient and uniform heating effect on the airflow.

[0119] Example 3

[0120] like Figures 1 to 2 As shown, this embodiment discloses a hair dryer, comprising a handle assembly 500 and a hair drying device as described in any of the above embodiments, wherein the handle assembly 500 is disposed on the hair drying device.

[0121] A third aspect of the present application provides a hair dryer, wherein the handle assembly 500 provides a user with convenient grip and operation of the hair dryer, so that the user can grip and operate the hair dryer comfortably. Using any of the above embodiments of the hair dryer can make the overall design of the hair dryer more compact, thereby improving the portability and convenience of storage and use of the hair dryer.

[0122] like Figure 3 As shown, in addition to the features of the above embodiment, this embodiment further defines that: an opening 5001 communicating with the first air inlet 301 of the air duct assembly 100 is provided at the connection between the blowing device and the handle assembly 500, the handle assembly is provided with a third air inlet 5002, a circuit board assembly is provided in the handle assembly, and the third air inlet 5002 is communicated with the opening 5001, so as to draw air along the third air inlet 5002 and allow the air flow to pass through the circuit board assembly. By providing the opening 5001 communicating with the first air inlet 301 of the air duct assembly 100 at the connection between the blowing device and the handle assembly 500, air flow can pass through the third air inlet 5002 of the handle assembly 500 and enter the handle assembly 500. In this process, the air flow passing through the circuit board assembly can carry away the heat generated by its operation, thereby achieving a heat dissipation function for the circuit board assembly, helping to reduce the temperature of the circuit board assembly and improving its stability and reliability.

[0123] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An air duct assembly, characterized in that: The air duct assembly is provided with a first air inlet (301) and an air outlet (202); The air duct assembly is provided with a first channel (302), a first turning channel (106), a second channel (103), a second turning channel (107) and a third channel (104); The first air inlet (301), the first channel (302), the first turning channel (106), the second channel (103), the second turning channel (107), the third channel (104) and the air outlet (202) are sequentially connected; The first channel (302) is used to transport the fluid to the first turning channel (106) along a first direction; The first diverting channel (106) is used to divert the fluid entering the first channel (302) to a second direction and enter the second channel (103); The second channel (103) is used to guide the fluid along a second direction to the second diverting channel (107); The second diverting channel (107) is used to divert the fluid output from the second channel (103) to a third direction and enter the third channel (104); The third channel (104) is used to guide the fluid to the air outlet (202).

2. The air duct assembly according to claim 1, characterized in that: The first direction is opposite to the second direction; And / or the third direction is opposite to the second direction.

3. The air duct assembly according to claim 1, characterized in that: The first direction intersects the second direction of extension; And / or the third direction intersects with the extension direction of the second direction.

4. The air duct assembly according to claim 1, characterized in that: The boundary of the cross section of the first turning channel (106) and / or the second turning channel (107) along the outlet direction is a combination of one or more of an arc, a parabola, an ellipse, a hyperbola and a straight line; Or the boundary of the cross section of the first turning channel (106) and / or the second turning channel (107) along the outlet direction is a curve.

5. An air duct assembly, characterized in that: include: A first shell (1), the first shell (1) being provided with a receiving cavity (101) and a first opening (102), the receiving cavity (101) and the first opening (102) being in communication; a second shell (2), the second shell (2) being nested and arranged outside the first shell (1), the second shell (2) being provided with a second opening (201) and an air outlet (202) at two axial ends thereof, the second opening (201) and the first opening (102) having the same opening direction; A third shell (3), wherein the third shell (3) is provided with a first air inlet (301), the third shell (3) cover is arranged at the second opening (201), and the third shell (3) at least partially extends into the accommodating cavity (101), wherein a second channel (103) is enclosed between the inner side of the first shell (1) and the third shell (3), and a third channel (104) is enclosed between the outer side of the first shell (1) and the second shell (2), and the second channel (103) and the third channel (104) are connected through the first opening (102), so that the air duct assembly (100) takes in air from the first air inlet (301) and discharges air through the air outlet (202).

6. The air duct assembly according to claim 5, characterized in that: The first shell (1) and the second shell (2) are integrally formed; and / or the first shell (1) and the third shell (3) are integrally formed; And / or the second shell (2) and the third shell (3) are integrally formed.

7. The air duct assembly according to claim 5, characterized in that: The third shell (3) extends into the first shell (1) at one axial end thereof and is spaced apart from the first shell (1) to form a first turning channel (106); a first channel (302) communicating with the first air inlet (301) is provided in the third shell (3); and the first turning channel (106) communicates with the first channel (302) and the second channel (103); A second turning channel (107) is formed between one end of the first shell (1) provided with the first opening (102) and the other axial end of the third shell (3), and the second turning channel (107) connects the second channel (103) and the third channel (104).

8. The air duct assembly according to claim 5, characterized in that: The first shell (1) comprises a first shell body (11) and a shielding portion (12), the shielding portion (12) being arranged on one axial end of the first shell body (11), the first shell body (11) and the shielding portion (12) forming the accommodating cavity (101), the first shell body (11) being provided with the first opening (102) at the other axial end of the first shell body (11), the third shell (3) extending into the accommodating cavity (101) through the first opening (102), the first shell (1) having an inner surface and an outer surface arranged opposite to each other, a second channel (103) being enclosed between the inner surface of the first shell body (11) and the third shell (3), and a third channel (104) being enclosed between the outer surface of the first shell body (11) and the second shell (2); and / or The second shell (2) includes a second shell body (21) and an air outlet portion (22), wherein the air outlet portion (22) is arranged on one axial end of the second shell body (21), and the air outlet portion (22) is provided with the air outlet (202), and the other axial end of the second shell body (21) is provided with the second opening (201), and the third shell (3) is covered on the second shell body (21), and the third channel (104) is formed between the outer side of the first shell (1) and the inner surface of the second shell body (21).

9. The air duct assembly according to claim 8, characterized in that: The third shell (3) includes a third shell body (31) and a radial extension portion (32), wherein the radial extension portion (32) is arranged on one axial end of the third shell body (31) and is convexly arranged relative to the surface of the third shell body (31), and the radial extension portion (32) is nested on the second shell (2) to cover the second opening (201), and the third shell body (31) forms a first through-channel (302) so that the first air inlet (301) is formed on one axial end of the third shell body (31), and the other axial end of the third shell body (31) is inserted into the accommodating cavity (101), and the second channel (103) is enclosed between the third shell body (31) and the inner side of the first shell (1).

10. The air duct assembly according to claim 9, characterized in that: It also includes a sealing ring (4), the sealing ring (4) being sleeved on the radial extension portion (32), the sealing ring (4) being in contact between the radial extension portion (32) and the second shell (2) to seal the gap between the radial extension portion (32) and the second shell (2); and / or One of the radial extension portion (32) and the second shell (2) is provided with a limiting rib (33), and the other of the radial extension portion (32) and the second shell (2) is provided with a limiting groove (203), and the limiting rib (33) is adapted to the limiting groove (203); and / or The first channel (302) of the third shell body (31) is used for installing the fan (400).

11. The air duct assembly according to claim 5, characterized in that: It also includes a heating component (5), which is installed in the third channel (104).

12. The air duct assembly according to claim 11, characterized in that: It also includes a mounting bracket, which is arranged on the first shell (1) or the second shell (2), and is located in the third channel (104). The mounting bracket is used to install the heating component (5).

13. The air duct assembly according to claim 12, characterized in that: The mounting bracket comprises a plurality of support members (6), the heating assembly (5) is arranged on the support members (6), the support members (6) are arranged at intervals along the outer surface of the first shell (1), the first shell (1) is provided with a slot (105), the support member (6) is provided with a rib, and the rib is at least partially located in the slot (105); and / or It also includes a heat insulating member (7), which is nested in the second shell (2) and located between the heating assembly (5) and the second shell (2).

14. A blowing device, characterized in that: include: An outer shell (300), wherein the outer shell (300) is provided with a second air inlet (3001) and a mounting cavity; The air duct assembly (100) according to any one of claims 5 to 13, wherein the air duct assembly (100) is arranged on the outer shell (300), and the air duct assembly (100) is at least partially located in the installation cavity; A fan (400), the fan (400) being arranged on the third shell (3), the fan (400) being located in the first channel (302) of the third shell (3), the fan (400) being used to allow the outer shell (300) to draw air from the second air inlet (3001) and to exhaust air along the air outlet (202) of the third shell (3).

15. A hair dryer, characterized in that: include: Handle assembly (500); The hair dryer according to claim 14, wherein the handle assembly (500) is provided on the hair dryer.

16. The hair dryer according to claim 15, characterized in that The blowing device is provided with an opening (5001), and the opening (5001) is provided close to the heating component (5) of the blowing device. The handle component (500) is provided with a second air inlet (3001), and the second air inlet (3001) is communicated with the opening (5001).

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