Air duct assembly, blowing device and electric hair dryer

Abstract

An air duct assembly, a blowing device and an electric hair dryer. The air duct assembly is provided with a first air inlet (301) and an air outlet (202), and the air duct assembly comprises a first channel (302), a first turning channel (106), a second channel (103), a second turning channel (107) and a third channel (104), wherein 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 in communication with each other in sequence; the first channel (302) is configured to convey a fluid in a first direction to the first turning channel (106); the first turning channel (106) is configured to turn the fluid which enters from the first channel (302) to face a second direction and enter the second channel (103); the second channel (103) is configured to guide the fluid in the second direction to the second turning channel (107); the second turning channel (107) is configured to turn the fluid output from the second channel (103) to face a third direction and enter the third channel (104); and the third channel (104) is configured to guide the fluid to the air outlet (202). The air duct assembly enables two turns by means of the first turning channel and the second turning channel, thereby realizing a miniaturized design.

Description

Air duct components, air blowing device and hair dryer

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent applications filed on June 28, 2024, with application number 202410861118.7 entitled "Air Duct Assembly, Main Unit and Hair Dryer" and application number 202421529577.7 entitled "Air Duct Assembly, Main Unit and Hair Dryer", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of hair dryer technology, and in particular to air duct components, hair dryer devices, and hair dryers. Background Technology

[0004] As people's living standards continue to improve, their needs for everyday electronic products, especially personal care products like hair dryers, are gradually shifting from simple functionality to diversification, personalization, and portability. While current hair dryers can meet basic drying needs, they have significant shortcomings in terms of size, weight, and portability, making them unsuitable for situations requiring convenient use, particularly during travel or business trips where frequent carrying of hair dryers is necessary. The current size of hair dryers has become a major burden for users. Summary of the Invention

[0005] Therefore, it is necessary to address the problem that hair dryers in related technologies are difficult to miniaturize due to their internal structure, and to provide a duct assembly, a blowing device, and a hair dryer.

[0006] One aspect of this application provides a duct assembly, the duct assembly having a first air inlet and an air outlet; the duct assembly having 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 sequentially connected; the first channel is used to transport fluid along a first direction to the first turning channel; the first turning channel is used to turn the fluid entering the first channel to a 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 turn the fluid output from the second channel to a third direction and enter the third channel; the third channel is used to guide the fluid to the air outlet.

[0007] In this design, the first and second turning channels in the duct assembly effectively guide the fluid from the initial first direction to the final third direction through two turns, eliminating the need for a traditional long-distance straight flow channel. This turning design significantly reduces the length and space requirements of the duct assembly, thus enabling miniaturization.

[0008] Furthermore, the continuous flow channel structure, from the first air inlet to the air outlet, through the first channel, the first turning channel, the second channel, the second turning channel, and the third channel, ensures the high efficiency and continuity of fluid flow. This allows for a compact structure of the duct assembly, reducing unnecessary space occupation, while also lowering flow resistance and improving fluid transmission efficiency.

[0009] The air duct component disclosed in this application, through a reasonable flow channel layout and deflection design, achieves a significant improvement in miniaturization and compactness while maintaining high performance. This optimized layout makes the air duct component easier to integrate into various devices or systems. For example, when the air duct component is applied to a hair dryer, it can make the hair dryer's structure more compact and facilitate the miniaturization design of the hair dryer.

[0010] In one embodiment, the first direction is opposite to the second direction. When the first direction is opposite to the second direction, it means that the flow direction of the fluid changes by 180 degrees before and after entering the first turning channel. Since no additional complex turning structure is required to achieve the change of direction, it not only simplifies the structure within the flow channel, but also further promotes the miniaturization and compactness of the duct assembly.

[0011] Furthermore, opposing airflow directions allow for a more compact duct assembly in either the vertical or horizontal direction. For example, if the first channel is horizontal and the second channel is vertical, a 180-degree turn can fully utilize vertical space, thereby increasing the overall channel length and performance without increasing horizontal dimensions. Moreover, because the first and second directions are opposite, the duct assembly can be flexibly arranged in different installation environments. For instance, if space is limited, the duct assembly can be designed in a "U" or "Z" shape to adapt to specific installation requirements.

[0012] In one embodiment, the third direction is opposite to the second direction. When the third direction is opposite to the second direction, the fluid's flow direction changes by 180 degrees after flowing through the second channel and entering the second turning channel. This design allows the duct assembly to achieve multiple turns within a limited space without the need for additional long-distance flow channels, which significantly improves the structural compactness of the duct assembly, making it more suitable for integration into miniaturized hair dryers.

[0013] In one embodiment, the third direction intersects the second direction. Similarly, when the first direction intersects the second direction, it allows fluid to change direction within a limited space without requiring excessively long straight flow channels, thereby reducing the overall size of the duct assembly and improving its compactness.

[0014] In one embodiment, the third direction intersects the second direction. When the third direction intersects the second direction, it allows fluid to change direction within a limited space without requiring excessively long straight flow channels, thereby reducing the overall size of the duct assembly and improving its compactness.

[0015] Furthermore, 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 the best fluid transmission effect and space utilization.

[0016] In one embodiment, the boundary of the cross-section of the first and / or second steering channels is a combination of one or more of the following: an arc shape, a parabolic shape, an elliptical portion, a hyperbola, and a straight line. The use of arc-shaped, parabolic, elliptical, or hyperbolic cross-sections allows for smoother fluid flow within the steering channels, reducing collisions and friction between the fluid and the walls, thereby lowering fluid resistance. This helps improve fluid transport efficiency and reduce energy loss due to resistance.

[0017] Furthermore, the design of arc-shaped or curved cross-sectional boundaries helps guide the fluid to distribute evenly during turning, reducing dead zones and vortex formation. This ensures that the fluid maintains a stable flow state when passing through the turning channel, improving the stability and reliability of fluid transmission. Then, after passing through arc-shaped, parabolic, elliptical, or hyperbolic sections, the airflow can flow in a straight line, thus completing the fluid turning process.

[0018] In some other embodiments, the boundaries of the cross-sections of the first and / or second steering channels are curved. The curved steering channels help guide the fluid to change direction smoothly, reducing direct collisions and friction between the fluid and the wall. This design can significantly reduce the resistance generated by the fluid during steering, thereby improving fluid transport efficiency and reducing energy loss.

[0019] One aspect of this application provides an air duct assembly, including a first housing, the first housing having a receiving cavity and a first opening, the receiving cavity and the first opening communicating; a second housing, the second housing nested outside the first housing, the second housing having a second opening and an air outlet at its axial ends respectively, the second opening having the same opening direction as the first opening; and a third housing, the third housing having a first air inlet, the third housing covering the second opening, the third housing at least partially extending into the receiving cavity, wherein the inner side of the first housing and the third housing enclose a first air passage, the outer side of the first housing and the second housing enclose a third passage, the first air passage and the third passage communicating through the first opening, so that the air duct assembly draws air from the first air inlet and exhausts air along the air outlet.

[0020] The first aspect of this application provides a duct assembly. By nesting a second housing outside a first housing, with the first opening in the first housing and the second opening in the second housing facing the same direction, a second air passage is formed between the outer side of the first housing and the second housing. Further, a third housing is inserted into a receiving cavity and covers the second opening, forming a first air passage between the third housing and the inner side of the first housing. When external air enters the receiving cavity of the second housing through a first air inlet, it first flows along the first air passage and then to the outer second air passage, before being exhausted through the air outlet, thereby improving the airflow path. The duct assembly disclosed in this application, by nesting the first and second housings and inserting the third housing into the cavity of the first housing, allows the inner and outer sides of the first housing to form a first air passage and a second air passage, respectively. The coordinated arrangement of the first, second, and third housings not only makes the entire duct assembly more compact but also fully utilizes the space within the duct assembly. These housings form a meandering airflow path, which is beneficial for miniaturizing the hair dryer body when applied to it.

[0021] Specifically, the air duct assembly, which is composed of the first housing, the second housing, and the third housing, has a first air inlet and an air outlet at both ends of its axial direction, which helps to further extend the air circulation path.

[0022] In one embodiment, the first housing and the second housing are integrally formed.

[0023] In one embodiment, the first housing and the third housing are integrally formed.

[0024] In one embodiment, the second housing and the third housing are integrally formed.

[0025] In one embodiment, the axial end of the third housing extending into the first housing is spaced apart from the first housing to form a first deflection channel. The third housing has a first channel communicating with the first air inlet, and the first deflection channel connects the first channel and the first air passage. Specifically, the third housing has two axial ends, and the end of the third housing extending into the first housing is spaced apart from the inner surface of the bottom of the first housing, thus forming the first deflection channel. This allows airflow entering the third housing through the first air inlet to flow along the first channel, then through the first deflection channel, and finally into the first air passage. The first deflection channel allows for a smooth transition of airflow before it enters the first air passage, further reducing turbulence and resistance, and improving airflow efficiency and stability. Furthermore, because the airflow reduces resistance due to the change in flow direction when passing through the first deflection channel, it helps improve the energy efficiency of the entire duct assembly, allowing airflow to pass through at higher speeds.

[0026] In one embodiment, a second turning channel is formed between the end of the first housing with the first opening and the other axial end of the third housing, the second turning channel connecting the first air passage and the third channel. Specifically, the other axial end of the third housing covers the second opening of the second housing, and the end of the first housing with the first opening is opposite to the radial extension of the other axial end of the third housing, forming the second turning channel. Further, the second turning channel can connect the inner and outer first air passage and the third channel. This allows the airflow to first pass through the second turning channel after passing through the first air passage, and then flow along the direction of the third channel to the air outlet of the second housing. The airflow can achieve a smooth transition when passing 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 duct assembly, allowing the airflow to pass through at a higher speed.

[0027] In one embodiment, the first housing includes a first housing body and a shielding portion. The shielding portion is disposed on one axial end of the first housing body, and the first housing body and the shielding portion form a receiving cavity. The other axial end of the first housing body has a first opening. The third housing extends into the receiving cavity through the first opening. The first housing has an inner surface and an outer surface that are disposed opposite to each other. The inner surface of the first housing body and the third housing form a first air passage, and the outer surface of the first housing body and the second housing form a third passage. The receiving cavity is formed by combining the first housing body and the shielding portion, wherein the shielding portion is disposed on one axial end of the first housing body. Specifically, as shown in FIG2, the first housing body is cylindrical, and one axial end of the first housing body has a first opening, so that the third housing can be inserted into the receiving cavity through the first opening. In this way, the shielding portion can prevent airflow from flowing out directly along the axial direction of the first housing body, which is beneficial to extending the airflow path. The portion of the third housing located within the receiving cavity forms a first air passage between itself and the inner surface of the first housing body. The outer surface of the first housing body and the second housing enclose a third passage. This arrangement of the first housing body creates an internally and externally spaced first and third air passages, which are connected by a second opening in the first housing body. This allows airflow to enter the duct assembly and flow, forming a tortuous flow path, effectively utilizing the space within the duct assembly and extending the airflow path.

[0028] In one embodiment, the second housing includes a second housing body and an air outlet. The air outlet is disposed on one axial end of the second housing body and has an air outlet. The other axial end of the second housing body has a second opening. The third housing covers the second opening and is connected to the second housing body. A third channel is formed between the outer side of the first housing and the inner surface of the second housing body. Further, the air outlet is disposed on one axial end of the second housing body and has an air outlet to allow airflow. The other axial end of the second housing body has a second opening, and the third housing covers the second opening and is connected to the second housing. This avoids the formation of an air inlet on the other axial end of the second housing body, preventing airflow from directly entering the second housing body through the second opening. Airflow can only enter through the first air inlet of the third housing and circulate along the meandering channel formed by the first and third channels.

[0029] In detail, the second housing body is cylindrical, the air outlet covers one axial end of the second housing body, and the air outlet is set along the edge near the connection between the air outlet and the second housing body, so that the airflow of the third channel can be discharged more smoothly and directly through the air outlet.

[0030] In one embodiment, the third housing includes a third housing body and a radial extension. The radial extension is disposed on one axial end of the third housing body and protrudes from the surface of the third housing body. The radial extension is nested on the second housing to block the second opening. The third housing body forms a through-passage first channel, so that the first air inlet is formed on one axial end of the third housing body. The other axial end of the third housing body is inserted into the receiving cavity. The third housing body and the inner side of the first housing enclose the first air passage to form a first airflow channel. By forming a through-passage first channel on the third housing body, a first air inlet is formed on one axial end of the third housing body, and the other axial end of the third housing body is inserted into the receiving cavity, allowing airflow to directly enter the first housing through the through-passage first channel. This optimizes the air entry path, reduces airflow resistance, and improves the suction efficiency of the hair dryer. A radial extension is provided on one axial end of the third housing body and protrudes relative to the surface of the third housing body. The radial extension extends from the surface of the third housing body to the second housing and is nested on the second housing to block the second opening, so that one axial end of the third housing body can only enter the air duct assembly through the first air inlet, thereby helping to extend the airflow path in the air duct assembly.

[0031] In one embodiment, a sealing ring is further included, which is fitted onto the radial extension and abuts against the radial extension and the second housing to seal the gap between them. By fitting the sealing ring onto the radial extension and abutting against the second housing, the gap between them can be effectively sealed, significantly enhancing the overall airtightness of the duct assembly. This prevents air leakage during flow, ensuring a stable airflow from the hair dryer. Simultaneously, it allows the axial end of the third housing to enter the duct assembly only through the first air inlet, thus extending the airflow path within the duct assembly. Furthermore, the tight fit of the sealing ring between the radial extension and the second housing can absorb and reduce vibration to some extent, thereby lowering noise levels and improving user comfort.

[0032] In one embodiment, one of the radial extension and the second housing is provided with a limiting rib, and the other of the radial extension and the second housing is provided with a limiting groove, the limiting rib being adapted to the limiting groove. By providing a limiting rib and a limiting groove that are adapted to each other, the radial extension and the second housing can be accurately aligned and firmly connected together during assembly. In some specific embodiments, a limiting rib is provided on the radial extension, and a limiting groove is provided on the second housing. Specifically, a limiting rib adapted to the limiting groove is provided on the outer surface of the radial extension, and a limiting groove is provided on the inner wall or edge of the second housing. This connection structure is simple and effective, can improve the assembly efficiency of the air duct assembly, and can also enhance its structural stability and reliability.

[0033] In one embodiment, the first channel of the third housing body is used to install a fan. By installing the fan within the first channel of the third housing body, a tight integration of the fan and the air duct assembly is achieved. Specifically, the fan is installed within the first channel, allowing the third housing to directly draw in air through the first air inlet, then allow air to circulate along the meandering path formed by the first air passage and the third channel within the air duct housing, and finally blow it out through the air outlet on the second housing, thereby extending the airflow channel within a compact space.

[0034] In one embodiment, a heating component is further included, which is installed within the first air passage or the third passage. By adding a heating component within the air duct assembly, the heating component can heat the airflow passing through the first air passage or the third passage, thereby increasing the airflow temperature at the outlet. Furthermore, placing the heating component within the first air passage or the third passage allows for a more compact overall structure of the air duct assembly, making full use of the space within the air duct assembly and facilitating the miniaturization design of the hair dryer. Specifically, placing the heating component within the third passage allows for better heating efficiency.

[0035] In one embodiment, a mounting bracket is further included, which is disposed on the first housing or the second housing and located within the third channel. The mounting bracket is used to mount the heating assembly. By providing the mounting bracket, the heating assembly can be securely fixed within the third channel, reducing performance degradation or safety risks to the duct assembly due to vibration or movement during use.

[0036] In one embodiment, the mounting bracket includes multiple support members, and the heating assembly is disposed on the support members. The support members are spaced apart along the outer surface of the first housing. The first housing has slots, and the support members have ribs, with at least a portion of the ribs located within the slots. The spaced-apart arrangement of the support members along the outer surface of the first housing allows the heating assembly to be distributed along this surface, facilitating uniform heating of the third channel and improving temperature stability at the air outlet. The support members provide a stable support structure for the heating assembly, ensuring its position within the duct assembly and reducing the risk of displacement or damage due to vibration or impact. Furthermore, the slots on the first housing match the ribs on the support members, allowing the support members to be easily installed onto the first housing and ensuring accurate positioning, simplifying the installation process and improving production efficiency. In addition, by designing the mounting bracket to consist of multiple support members, the bracket becomes more flexible, allowing the number of support members to be increased or decreased as needed to accommodate heating assemblies of different sizes and weights.

[0037] More specifically, the heating component uses heating wires, which can be wound around various support members to provide uniform heating through a third channel.

[0038] In one embodiment, a heat insulation element is further included, nested within the second housing, positioned between the heating component and the second housing. By providing the heat insulation element, direct contact between the heat generated by the heating component and the second housing is effectively isolated. This design lowers the temperature of the second housing, reduces heat loss to the external environment, and improves thermal energy utilization efficiency. Furthermore, by reducing heat loss to the outside, when the air duct assembly is applied to a hair dryer, the heat insulation element can also prevent overheating of the air outlet, reducing the risk of burns to the user. Specifically, the heat insulation element is cylindrical, and the exterior of the second housing is enclosed within the inner cavity of the cylindrical portion.

[0039] A second aspect of this application provides a blower device, comprising: a housing having a second air inlet and a mounting cavity; an air duct assembly as described in any of the above embodiments, the air duct assembly being disposed on the housing and at least partially located within the mounting cavity; and a fan disposed on a third housing, the fan being located within a first channel of the third housing, the fan being used to draw air from the second air inlet into the housing and exhaust air along the air outlet of the third housing.

[0040] The second aspect of this application provides a blower device. A mounting cavity on the outer casing can be used to install an air duct assembly. The outer casing has a second air inlet, which cooperates with the air duct assembly to allow sufficient air to enter the device. Compared to related technologies where the fan is separately installed, this application saves space by placing the fan within the first channel of the third housing of the air duct assembly, thereby significantly reducing the axial length of the blower device and reducing its overall size, achieving a miniaturized design. Furthermore, the air duct assembly has a first air passage and a third channel forming a meandering airflow path. A heating component can be installed within the first or third air passage, which facilitates efficient and uniform heating of the airflow.

[0041] A second aspect of this application provides a hair dryer, including a handle assembly; as described in any of the above embodiments, the handle assembly is disposed on the hair dryer. The handle assembly provides the user with convenience in holding and operating the hair dryer, allowing the user to comfortably hold and operate it. The hair dryer using any of the above embodiments allows for a more compact overall design, improving the portability and ease of storage and use of the hair dryer.

[0042] In one embodiment, the connection between the blower and the handle assembly has an opening communicating with a first air inlet of the air duct assembly. The handle assembly has a third air inlet, and a circuit board assembly is housed within the handle assembly. The third air inlet communicates with the opening to draw air through the circuit board assembly. By providing an opening communicating with the first air inlet of the air duct assembly at the connection between the blower and the handle assembly, airflow can enter the handle assembly through the third air inlet. During this process, the airflow passing through the circuit board assembly can carry away the heat generated during its operation, achieving heat dissipation for the circuit board assembly, which helps to reduce the temperature of the circuit board assembly and improve its stability and reliability. Attached Figure Description

[0043] Figure 1 is a perspective view of a hair dryer according to an embodiment of this application;

[0044] Figure 2 is a second perspective view of a hair dryer according to an embodiment of this application;

[0045] Figure 3 is a cross-sectional view of a hair dryer according to an embodiment of this application;

[0046] Figure 4 is a perspective view of one embodiment of the air duct assembly of this application;

[0047] Figure 5 is a second perspective view of an air duct assembly according to an embodiment of this application;

[0048] Figure 6 is a cross-sectional view of a duct assembly according to an embodiment of this application;

[0049] Figure 7 is an exploded view of a duct assembly according to an embodiment of this application;

[0050] Figure 8 is an exploded cross-sectional view of a duct assembly according to an embodiment of this application;

[0051] Figure 9 is a perspective view of the first housing according to an embodiment of this application;

[0052] Figure 10 is a perspective view of one embodiment of the second housing of this application;

[0053] Figure 11 is a second perspective view of the second housing according to an embodiment of this application;

[0054] Figure 12 is a perspective view of the third housing according to an embodiment of this application.

[0055] The correspondence between the reference numerals and the component names is as follows:

[0056] 100 air duct assembly;

[0057] 1 First housing, 101 Receiving cavity, 102 First opening, 103 Second channel, 104 Third channel, 105 Slot, 106 First turning channel, 107 Second turning channel, 11 First housing body, 12 Covering part;

[0058] 2 Second housing, 201 Second opening, 202 Air outlet, 203 Limiting groove, 21 Second housing body, 22 Air outlet;

[0059] 3 Third housing, 301 First air inlet, 302 First channel, 31 Third housing body, 32 Radial extension, 33 Limiting rib;

[0060] 4. Sealing rings;

[0061] 5. Heating components;

[0062] 6 support components;

[0063] 7. Thermal insulation components;

[0064] 300 outer casing, 3001 second air inlet;

[0065] 400 fan;

[0066] 500 Handle assembly, 5001 Opening, 5002 Third air inlet. Detailed Implementation

[0067] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0068] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0069] The following description, with reference to the accompanying drawings, describes some embodiments of the air duct assembly 100, the blower device 200, and the hair dryer. Example 1

[0070] Please refer to Figures 4 to 6. One aspect of this application provides a duct assembly, which has a first air inlet 301 and an air outlet 202. The duct assembly has 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 fluid along a 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 a 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 a third direction and enter the third channel 104. The third channel 104 is used to guide the fluid to the air outlet 202.

[0071] In this design, the first turning channel 106 and the second turning channel 107 in the duct assembly effectively guide the fluid from the initial first direction to the final third direction through two turns, without requiring a traditional long-distance straight flow channel. This turning design greatly reduces the length or space requirements of the duct assembly, thus achieving miniaturization.

[0072] Furthermore, from the first air inlet 301 to the air outlet 202, the fluid passes through a continuous flow channel structure consisting 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 the high efficiency and continuity of fluid flow. This allows for a compact structure of the duct assembly, reducing unnecessary space occupation, while also lowering flow resistance and improving fluid transmission efficiency.

[0073] The air duct component disclosed in this application, through a reasonable flow channel layout and deflection design, achieves a significant improvement in miniaturization and compactness while maintaining high performance. This optimized layout makes the air duct component easier to integrate into various devices or systems. For example, when the air duct component is applied to a hair dryer, it can make the hair dryer's structure more compact and facilitate the miniaturization design of the hair dryer.

[0074] In one embodiment, the first direction is opposite to the second direction. When the first direction is opposite to the second direction, it means that the flow direction of the fluid changes by 180 degrees before and after entering the first turning channel 106. Since no additional complex turning structure is required to achieve the change of direction, it not only simplifies the structure within the flow channel, but also further promotes the miniaturization and compactness of the air duct assembly.

[0075] Please refer to Figure 6. Within the corresponding channels, the first direction, the second direction, and the third direction can be understood by referring to the direction of airflow.

[0076] Furthermore, opposing flow directions allow for a more compact duct assembly in either the vertical or horizontal direction. For example, if the first channel 302 is horizontal and the second channel 103 is vertical, a 180-degree turn can fully utilize vertical space, thereby increasing the overall flow path length and performance without increasing horizontal dimensions. Moreover, because the first and second directions are opposite, the duct assembly can be flexibly arranged in different installation environments. For instance, if space is limited, the duct assembly can be designed in a "U" or "Z" shape to adapt to specific installation requirements.

[0077] In one embodiment, the third direction is opposite to the second direction. When the third direction is opposite to the second direction, the flow direction of the fluid changes by 180 degrees after flowing through the second channel 103 and entering the second turning channel 107. This design allows the duct assembly to achieve multiple turns within a limited space without the need for additional long-distance flow channels, which significantly improves the structural compactness of the duct assembly, making it more suitable for integration into miniaturized hair dryers.

[0078] In one embodiment, the third direction intersects the second direction. Similarly, when the first direction intersects the second direction, it allows fluid to change direction within a limited space without requiring excessively long straight flow channels, thereby reducing the overall size of the duct assembly and improving its compactness.

[0079] In one embodiment, the third direction intersects the second direction. When the third direction intersects the second direction, it allows the fluid to change direction within a limited space without requiring excessively long straight flow channels, thereby reducing the overall size of the duct assembly and improving its compactness.

[0080] Furthermore, 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 the best fluid transmission effect and space utilization.

[0081] In one embodiment, 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 the following: arcuate, parabolic, elliptical, hyperbolic, and straight lines. The use of arcuate, parabolic, elliptical, or hyperbolic cross-section designs allows for smoother fluid flow within the turning channels, reducing collisions and friction between the fluid and the walls, thereby lowering fluid resistance. This helps improve fluid transport efficiency and reduce energy loss due to resistance.

[0082] Furthermore, the design of arc-shaped or curved cross-sectional boundaries helps guide the fluid to distribute evenly during turning, reducing dead zones and vortex formation. This ensures that the fluid maintains a stable flow state when passing through the turning channel, improving the stability and reliability of fluid transmission. Then, after passing through arc-shaped, parabolic, elliptical, or hyperbolic sections, the airflow can flow in a straight line, thus completing the fluid turning process.

[0083] In some other embodiments, the boundaries of the cross-sections of the first turning channel 106 and / or the second turning channel 107 along the outlet direction are curved. The curved turning channels help guide the fluid to change direction smoothly, reducing direct collisions 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.

[0084] Please refer to Figures 4 to 6. This embodiment discloses an air duct assembly 100, including a first housing 1, which has a receiving cavity 101 and a first opening 102, and the receiving cavity 101 and the first opening 102 are connected; a second housing 2, which is nested outside the first housing 1, and has a second opening 201 and an air outlet 202 at its two axial ends, respectively, with the second opening 201 and the first opening 102 having the same opening direction; and a third housing 3, which has a first air inlet 301, which covers the second opening 201, and at least partially extends into the receiving cavity 101. A second channel 103 is formed between the inner side of the first housing 1 and the third housing 3, and a third channel 104 is formed between the outer side of the first housing 1 and the second housing 2. The second channel 103 and the third channel 104 are connected through the first opening 102, so that the air duct assembly 100 can take in air from the first air inlet 301 and exit air through the air outlet 202.

[0085] The first aspect of this application provides an air duct assembly 100, in which a second housing 2 is nested outside a first housing 1, and the first opening 102 of the first housing 1 and the second opening 201 of the second housing 2 are in the same direction, so that the outer side of the first housing 1 and the second housing 2 enclose each other to form a second air passage. Further, a third housing 3 is inserted into a receiving cavity 101, and the third housing 3 covers the second opening 201, so that the third housing 3 and the inner side of the first housing 1 enclose a second channel 103. When external air enters the receiving cavity 101 of the second housing 2 through the first air inlet 301, it can first flow along the second channel 103 and then to the second air passage outside, and then be exhausted through the air outlet 202, thereby improving the airflow path. The air duct assembly 100 disclosed in this application, by nesting the first housing 1 and the second housing 2 inside and outside, and inserting the third housing 3 into the cavity of the first housing 1, can form a first air passage and a second air duct on the inner and outer sides of the first housing 1, respectively. The cooperative arrangement of the first housing 1, the second housing 2 and the third housing 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. These housings form a meandering air flow path, which is beneficial to the miniaturization design of the hair dryer 400 when applied in hair dryers.

[0086] As shown in Figure 6, specifically, the air duct assembly 100, which is composed of the first housing 1, the second housing 2 and the third housing 3, is provided with a first air inlet 301 and an air outlet 202 at both ends of its axial direction, which is beneficial to further extend the air circulation path.

[0087] In addition to the features of the above embodiments, this embodiment further specifies that: the first housing 1 and the second housing 2 are integrally formed.

[0088] In addition to the features of the above embodiments, this embodiment further specifies that the first housing 1 and the third housing 3 are integrally formed.

[0089] In addition to the features of the above embodiments, this embodiment further specifies that the second housing 2 and the third housing 3 are integrally formed.

[0090] As shown in Figures 3 and 6, one end of the third housing 3 is positioned close to the rear sidewall inside the first housing 1, and the end of the third housing 3 is spaced apart from the inner surface of the first housing 1.

[0091] As shown in Figures 3 and 6, in addition to the features of the above embodiments, this embodiment further specifies that: the axial end of the third housing 3 extending into the first housing 1 is spaced apart from the first housing 1 to form a first turning channel 106, the third housing 3 is provided with a first channel 302 communicating with the first air inlet 301, and the first turning channel 106 connects the first channel 302 and the second channel 103.

[0092] Specifically, the third housing 3 has two axial ends. One axial end of the third housing 3 extends into the first housing 1 and is spaced apart from the inner surface of the bottom of the first housing 1, thus forming a first deflection channel 106. This allows the airflow entering the third housing 3 through the first air inlet 301 to flow along the first channel 302, then through the first deflection channel 106, and finally to the second channel 103. The first deflection channel 106 allows for a smooth transition of the airflow before it enters the second channel 103, further reducing turbulence and resistance, and improving airflow efficiency and stability. On the other hand, because the airflow reduces resistance due to the change in flow direction when passing through the first deflection channel 106, it helps improve the energy efficiency of the entire duct assembly, allowing the airflow to pass through at higher speeds.

[0093] As shown in Figure 6, at least part of the inner surface of the bottom of the first housing 1 is arc-shaped, and the arc-shaped surface of the bottom of the first housing 1 and the third housing 3 enclose each other to form a first turning channel 106.

[0094] As shown in Figures 3 and 6, in addition to the features of the above embodiments, this embodiment further specifies that: a second turning channel 107 is formed between one end of the first housing 1 with the first opening 102 and the other axial end of the third housing 3, and the second turning channel 107 connects the second channel 103 and the third channel 104.

[0095] Specifically, the other axial end of the third housing 3 covers the second opening of the second housing. The end of the first housing 1 with the first opening 102 is opposite to the radial extension 32 provided at the other axial end of the third housing 3, forming a second turning channel 107. Further, the second turning channel 107 can connect the inner and outer second channel 103 and the third channel 104. This allows the airflow passing through the second channel 103 to first pass through the second turning channel 107, and then flow along the direction of the third channel 104 towards the air outlet 202 of the second housing 2. The airflow can achieve a smooth transition when passing through the second turning channel 107, thereby further reducing turbulence and resistance, and improving airflow efficiency and stability. 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 107, it helps to improve the energy efficiency of the entire duct assembly, allowing the airflow to pass through at higher speeds.

[0096] As shown in Figure 6, the inner surface of the third housing 3, which is disposed opposite to the first housing 1, is at least partially arc-shaped, and the arc-shaped surface of the third housing 3 and the end of the first housing 1 enclose each other to form a second turning channel 107.

[0097] It is understandable that the airflow directions of the second channel 103 and the third channel 104 are opposite.

[0098] As shown in Figures 7, 8, and 9, in addition to the features of the above embodiments, this embodiment further defines: the first housing 1 includes a first housing body 11 and a blocking portion 12. The blocking portion 12 is disposed on one axial end of the first housing body 11, and the first housing body 11 and the blocking portion 12 form a receiving cavity 101. The other axial end of the first housing body 11 is provided with a first opening 102. The third housing 3 extends into the receiving cavity 101 through the first opening 102. The first housing 1 has an inner surface and an outer surface disposed opposite to each other. The inner surface of the first housing body 11 and the third housing 3 form a second channel 103, and the outer surface of the first housing body 11 and the second housing 2 form a third channel 104. The receiving cavity 101 is formed by combining the first housing body 11 and the blocking portion 12, wherein the blocking portion 12 is disposed on one axial end of the first housing body 11.

[0099] In detail, as shown in Figure 9, the first housing body 11 is cylindrical, and a first opening 102 is provided at one axial end of the first housing body 11, so that the third housing 3 can be inserted into the receiving cavity 101 through the first opening 102. In this way, the shielding part 12 can prevent the airflow from flowing directly out along the axial direction of the first housing body 11, which helps to extend the airflow path. The portion of the third housing 3 located in the receiving cavity 101 forms a second channel 103 between itself and the inner surface of the first housing body 11, and the outer surface of the first housing body 11 and the second housing 2 enclose a third channel 104. In this way, the first housing body 11 can be used to form the second channel 103 and the third channel 104, which are arranged inside and outside, and the second channel 103 and the third channel 104 can be connected through the second opening 201 in the first housing body 11. The airflow enters the air duct assembly 100 and flows, thus forming a tortuous flow path, thereby effectively utilizing the space within the air duct assembly 100 and extending the airflow path.

[0100] As shown in Figures 10 and 11, in addition to the features of the above embodiments, this embodiment further defines that: the second housing 2 includes a second housing body 21 and an air outlet 22, the air outlet 22 is disposed on one axial end of the second housing body 21, the air outlet 22 is provided with an air outlet 202, the other axial end of the second housing body 21 is provided with a second opening 201, the third housing 3 is covered on the second opening 201 and connected to the second housing body 21, and a third channel 104 is formed between the outer side of the first housing 1 and the inner surface of the second housing body 21.

[0101] The air outlet 22 is located on one axial end of the second housing body 21, and the air outlet 22 has an air outlet 202 to allow airflow. The other axial end of the second housing body 21 has a second opening 201, and the third housing is covered at the second opening 201 and connected to the second housing. In this way, an air inlet is avoided from forming on the other axial end of the second housing body 21, and the airflow is prevented from directly entering the second housing body 21 through the second opening 201. The airflow can only enter through the first air inlet 301 of the third housing and circulate along the meandering channel formed by the second channel 103 and the third channel 104.

[0102] In detail, the second housing body 21 is cylindrical, the air outlet 22 covers one axial end of the second housing body 21, and the air outlet 202 of the air outlet 22 is set along the edge near the connection between the air outlet 22 and the second housing body 21, so that the airflow of the third channel 104 can be discharged more smoothly and directly through the air outlet 202.

[0103] As shown in Figures 6 and 12, in addition to the features of the above embodiments, this embodiment further defines that: the third housing 3 includes a third housing body 31 and a radial extension 32. The radial extension 32 is disposed on one axial end of the third housing body 31 and is provided protruding relative to the surface of the third housing body 31. The radial extension 32 is nested on the second housing 2 to block the second opening 201. The third housing body 31 forms a through first channel 302 so that a first air inlet 301 is formed on one axial end of the third housing body 31. The other axial end of the third housing body 31 is inserted into the receiving cavity 101. The third housing body 31 and the inner side of the first housing 1 enclose each other to form a second channel 103. The third housing body 31 forms a through first channel 302, which forms a first air inlet 301 on one axial end of the third housing body 31. The other axial end of the third housing body 31 is inserted into the receiving cavity 101, so that the airflow can directly enter the first housing through the through first channel 302, which optimizes the air entry path, reduces the air flow resistance, and improves the suction efficiency of the hair dryer.

[0104] Furthermore, the radial extension 32 is provided on one axial end of the third housing body 31 and protrudes relative to the surface of the third housing body 31. The radial extension 32 extends from the surface of the third housing body 31 toward the second housing 2 and is nested on the second housing 2 to block the second opening 201, so that one axial end of the third housing body 31 can only enter the air duct assembly 100 through the first air inlet 301, thereby helping to extend the flow path of airflow in the air duct assembly 100.

[0105] As shown in Figure 3, in addition to the features of the above embodiments, this embodiment further includes a sealing ring 4, which is sleeved on the radial extension 32 and abuts against the radial extension 32 and the second housing 2 to seal the gap between the radial extension 32 and the second housing 2. By sleeved on the radial extension 32 and abutting against the radial extension 32 and the second housing 2, the gap between the radial extension 32 and the second housing 2 can be effectively sealed, thereby significantly enhancing the sealing performance of the entire air duct assembly 100. This prevents air leakage during flow, ensures that the hair dryer can generate a stable airflow, and allows one axial end of the third housing body 31 to enter the air duct assembly 100 only through the first air inlet 301, thus facilitating the extension of the airflow path within the air duct assembly 100.

[0106] On the other hand, the sealing ring 4 can fit tightly between the radial extension 32 and the second housing 2, which can absorb and reduce vibration to a certain extent, thereby reducing noise level and improving the comfort of use.

[0107] As shown in Figures 4, 8, and 12, in addition to the features of the above embodiments, this embodiment further specifies that: one of the radial extension 32 and the second housing 2 is provided with a limiting rib 33, and the other of the radial extension 32 and the second housing 2 is provided with a limiting groove 203, wherein the limiting rib 33 and the limiting groove 203 are adapted to each other. By providing the limiting rib 33 and the limiting groove 203 to be adapted to each other, the radial extension 32 and the second housing 2 can be accurately aligned and firmly connected together during assembly.

[0108] In some specific embodiments, a limiting rib 33 is provided on the radial extension 32, and a limiting groove 203 is provided on the second housing 2. Specifically, a limiting rib 33 adapted to the limiting groove 203 is provided on the outer surface of the radial extension 32, and a limiting groove 203 is provided on the inner wall or edge of the second housing 2. This connection structure is simple and effective, which can improve the assembly efficiency of the air duct assembly 100 and enhance its structural stability and reliability.

[0109] As shown in Figure 3, in addition to the features of the above embodiments, this embodiment further specifies that the first channel 302 of the third housing body 31 is used to install the fan 400. By installing the fan 400 in the first channel 302 of the third housing body 31, a tight integration of the fan 400 and the air duct assembly 100 is achieved. Specifically, the fan 400 is installed in the first channel 302, allowing the third housing 3 to directly draw in air through the first air inlet 301, and then allow it to flow along the meandering path formed by the second channel 103 and the third channel 104 within the air duct housing, and finally blow it out through the air outlet 202 on the second housing 2, thereby extending the airflow channel within a compact space.

[0110] As shown in Figure 3, in addition to the features of the above embodiments, this embodiment further includes a heating component 5, which is installed in the second channel 103 or the third channel 104. By adding the heating component 5 to the air duct assembly 100, the heating component 5 can be used to heat the airflow flowing through the second channel 103 or the third channel 104, thereby increasing the airflow temperature at the air outlet 202.

[0111] Furthermore, the heating component 5 is disposed within the second channel 103 or the third channel 104, which makes the overall structure of the air duct assembly 100 more compact, makes full use of the space within the air duct assembly 100, and is conducive to the miniaturization design of the hair dryer. Specifically, the heating component 5 is disposed within the third channel 104, which can achieve better heating efficiency.

[0112] As shown in Figures 7 and 8, in addition to the features of the above embodiments, this embodiment further includes a mounting bracket, which is disposed on the first housing 1 or the second housing 2 and located within the third channel 104. The mounting bracket is used to mount the heating component 5. By providing the mounting bracket, the heating component 5 can be firmly fixed within the third channel 104, reducing the performance degradation or safety risks of the air duct assembly 100 due to vibration or movement during use.

[0113] As shown in Figures 7 and 9, in addition to the features of the above embodiments, this embodiment further specifies that: the mounting bracket includes multiple 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 slot 105, and the support members 6 are provided with ribs, at least partially located within the slot 105. The spaced arrangement of the support members 6 along the outer surface of the first housing 1 allows the heating assembly 5 to be distributed along the outer surface of the first housing 1, which is beneficial for uniform heating of the third channel 104 and for improving the temperature stability of the air outlet. The arrangement of the support members 6 provides a stable support structure for the heating assembly 5, allowing the heating assembly 5 to be fixed in position within the air duct assembly 100, reducing the risk of displacement or damage caused by vibration or impact.

[0114] Furthermore, the slot 105 on the first housing 1 matches the protruding rib on the support member 6, allowing the support member 6 to be easily installed onto the first housing 1 and ensuring its accurate positioning. This simplifies the installation process and improves production efficiency. In addition, by designing the mounting bracket to consist of multiple support members 6, the mounting bracket becomes more flexible, allowing the number of support members 6 to be increased or decreased as needed to accommodate heating components 5 of different sizes and weights.

[0115] More specifically, the heating component 5 uses heating wires, which can be wound around each support member 6 and can be uniformly heated through the third channel 104.

[0116] As shown in Figures 7 and 8, in addition to the features of the above embodiments, this embodiment further includes a heat insulation component 7, which is nested within the second housing 2 and located between the heating component 5 and the second housing 2. By providing the heat insulation component 7, direct contact between the heat generated by the heating component 5 and the second housing 2 can be effectively isolated. This design reduces the temperature of the second housing 2, decreases heat loss to the external environment, and improves the efficiency of heat energy utilization. Furthermore, due to the reduced heat loss to the outside, when the air duct assembly 100 is applied to a hair dryer, the heat insulation component 7 can also prevent the air outlet 22 from overheating, reducing the risk of burns to the user. Specifically, the heat insulation component 7 is cylindrical, and the exterior of the second housing is enclosed within the inner cavity of the cylindrical portion. Example 2

[0117] As shown in Figure 3, this embodiment discloses a blower device, including a housing 300, a duct assembly 100 as described in any of the above embodiments, and a fan 400. The housing 300 is provided with a second air inlet 3001 and a mounting cavity; the duct assembly 100 is disposed on the housing 300, and the duct assembly 100 is at least partially located in the mounting cavity; the fan 400 is disposed on a third housing 3, and the fan 400 is located in a first channel 302 of the third housing 3. The fan 400 is used to draw air from the second air inlet 3001 into the housing 300 and exhaust air along the air outlet 202 of the third housing 3.

[0118] The second aspect of this application provides a blower device. A mounting cavity on the outer casing can be used to install an air duct assembly 100. A second air inlet 3001 is provided on the outer casing 300. The second air inlet 3001 cooperates with the air duct assembly 100 to allow sufficient air to enter the device. Compared to the separate installation of the fan 400 in related technologies, this application saves space by placing the fan 400 within the first channel 302 of the third housing 3 of the air duct assembly 100, thereby significantly reducing the axial length of the blower device and reducing the overall size of the blower device, achieving a miniaturized design. Furthermore, the air duct assembly 100 has a second channel 103 and a third channel 104 forming a meandering airflow path. A heating component 5 can be installed within the second channel 103 or the third channel 104, which facilitates efficient and uniform heating of the airflow. Example 3

[0119] As shown in Figures 1 and 2, this embodiment discloses a hair dryer, including a handle assembly 500 and a hair dryer device as described in any of the above embodiments, wherein the handle assembly 500 is disposed on the hair dryer device.

[0120] A third aspect of this application provides a hair dryer in which a handle assembly 500 provides a user with convenience in holding and operating the hair dryer, allowing the user to comfortably hold and operate the hair dryer. The hair dryer device employing any of the above embodiments can make the overall design of the hair dryer more compact, improving its portability and ease of storage and use.

[0121] As shown in Figure 2, in addition to the features of the above embodiments, this embodiment further specifies that: the connection between the blower and the handle assembly 500 is provided with an opening 5001 communicating with the first air inlet 301 of the air duct assembly 100; the handle assembly is provided with a third air inlet 5002; a circuit board assembly is provided inside the handle assembly; the third air inlet 5002 communicates with the opening 5001 to draw air along the third air inlet 5002 and allow airflow to pass through the circuit board assembly. By providing an opening 5001 communicating with the first air inlet 301 of the air duct assembly 100 at the connection between the blower and the handle assembly 500, airflow can pass through the third air inlet 5002 of the handle assembly 500 and enter the handle assembly 500. During this process, the airflow passing through the circuit board assembly can carry away the heat generated by its operation, realizing the heat dissipation function of the circuit board assembly, which helps to reduce the temperature of the circuit board assembly and improve its stability and reliability.

[0122] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0123] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A 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 connected in sequence; The first channel (302) is used to deliver 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 a 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 diversion channel (107) is used to divert the fluid output from the second channel (103) to a third direction and into the third channel (104). The third channel (104) is used to guide 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 party is directed in the opposite direction to the second direction.

3. The air duct assembly according to claim 1, characterized in that, The first direction intersects with the extension direction of the second direction; And / or the third party intersects with the direction of extension 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 steering channel (106) and / or the second steering channel (107) along the exit direction is a combination of one or more of the following: arc-shaped, parabolic, elliptical, hyperbolic, and straight lines; The boundaries of the cross sections of the first steering channel (106) and / or the second steering channel (107) along the exit direction are curves.

5. A duct assembly, characterized in that, include: A first housing (1) is provided with a receiving cavity (101) and a first opening (102), wherein the receiving cavity (101) and the first opening (102) are connected; The second housing (2) is nested outside the first housing (1). The second housing (2) has a second opening (201) and an air outlet (202) at its two axial ends respectively. The second opening (201) has the same opening direction as the first opening (102). The third housing (3) is provided with a first air inlet (301). The third housing (3) covers the second opening (201). The third housing (3) extends at least partially into the receiving cavity (101). The inner side of the first housing (1) and the third housing (3) form a second channel (103). The outer side of the first housing (1) and the second housing (2) form a third channel (104). The second channel (103) and the third channel (104) are connected through the first opening (102) so that the air duct assembly (100) can take in air from the first air inlet (301) and take out air through the air outlet (202).

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

7. The air duct assembly according to claim 5, characterized in that, The third housing (3) extends into the first housing (1) at one axial end and is spaced apart from the first housing (1) to form a first turning channel (106). The third housing (3) is provided with a first channel (302) communicating with the first air inlet (301). The first turning channel (106) connects the first channel (302) and the second channel (103). The first housing (1) has a first opening (102) at one end, which forms a second turning channel (107) between the other end of the third housing (3) and the first opening (102). 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 housing (1) includes a first housing body (11) and a shielding part (12). The shielding part (12) is disposed on one axial end of the first housing body (11). The first housing body (11) and the shielding part (12) form the receiving cavity (101). The other axial end of the first housing body (11) is provided with the first opening (102). The third housing (3) extends into the receiving cavity (101) through the first opening (102). The first housing (1) has an inner surface and an outer surface that are disposed opposite to each other. The inner surface of the first housing body (11) and the third housing (3) form a second channel (103). The outer surface of the first housing body (11) and the second housing (2) form a third channel (104). The second housing (2) includes a second housing body (21) and an air outlet (22). The air outlet (22) is disposed on one axial end of the second housing body (21) and the air outlet (22) is provided with the air outlet (202). The other axial end of the second housing body (21) is provided with the second opening (201). The third housing (3) is covered on the second housing body (21). The third channel (104) is formed between the outer side of the first housing (1) and the inner surface of the second housing body (21).

9. The air duct assembly according to claim 8, characterized in that, The third housing (3) includes a third housing body (31) and a radial extension (32). The radial extension (32) is disposed on one axial end of the third housing body (31) and protrudes from the surface of the third housing body (31). The radial extension (32) is nested on the second housing (2) to cover the second opening (201). The third housing body (31) forms a through first channel (302) so that the first air inlet (301) is formed on one axial end of the third housing body (31). The other axial end of the third housing body (31) is inserted into the receiving cavity (101). The second channel (103) is formed between the third housing body (31) and the inner side of the first housing (1).

10. The air duct assembly according to claim 9, characterized in that, It also includes a sealing ring (4), which is fitted onto the radial extension (32) and abuts against the radial extension (32) and the second housing (2) to seal the gap between the radial extension (32) and the second housing (2); and / or One of the radial extension (32) and the second housing (2) is provided with a limiting rib (33), and the other of the radial extension (32) and the second housing (2) is provided with a limiting groove (203), wherein the limiting rib (33) is adapted to the limiting groove (203); and / or The first channel (302) of the third housing body (31) is used to install 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 disposed on the first housing (1) or the second housing (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 includes multiple 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 slot (105), the support members (6) are provided with ribs, and the ribs are at least partially located within the slots (105); and / or It also includes a heat insulation component (7), which is nested inside the second housing (2) and is located between the heating component (5) and the second housing (2).

14. A blower device, characterized in that, include: The outer casing (300) is provided with a second air inlet (3001) and a mounting cavity; The air duct assembly (100) as claimed in any one of claims 5 to 13, the air duct assembly (100) being disposed on the housing (300), the air duct assembly (100) being at least partially located within the mounting cavity; A fan (400) is disposed on the third housing (3). The fan (400) is located in the first channel (302) of the third housing (3). The fan (400) is used to draw air from the second air inlet (3001) and exhaust air along the air outlet (202) of the third housing (3).

15. A hair dryer, characterized in that, include: Handle assembly (500); The blower device as claimed in claim 14, wherein the handle assembly (500) is disposed on the blower device.

16. The hair dryer according to claim 15, characterized in that, The blower is provided with an opening (5001) which is located near the heating component (5) of the blower. The handle assembly (500) is provided with a second air inlet (3001) which is connected to the opening (5001).

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