EP4670568A1

EP4670568A1 - AIR DUCT ARRANGEMENT, BLOW DEVICE AND ELECTRIC HAIR DRYER

Info

Publication number: EP4670568A1
Application number: EP25168315.7A
Authority: EP
Inventors: Baohua Wang
Original assignee: Foshan Shunde Leitai Electrical Co Ltd
Current assignee: Foshan Shunde Leitai Electrical Co Ltd
Priority date: 2024-06-28
Filing date: 2025-04-03
Publication date: 2025-12-31
Also published as: CN121220880A; US20260000177A1

Abstract

An air duct assembly, a blowing device and an electric hair dryer are provided. A first air inlet and an air outlet are formed in the air duct assembly. The air duct assembly is provided with a first passage, a first diversion passage, a second passage, a second diversion passage and a third passage. Fluid is conveyed to the first diversion passage along a first direction. The fluid entering from the first passage is diverted to to a second direction and enabling the fluid to enter the second passage. The second passage is configured for diverting the fluid to the second diversion passage along a second direction. The second diversion passage is configured for diverting the fluid output from the second passage to a third direction and enabling the fluid to enter the third passage. The third passage is configured for diverting the fluid to the air outlet.

Description

TECHNICAL FIELD

The present disclosure relates to the technical field of electric hair dryers, in particular to an air duct assembly, a blowing device and an electric hair dryer.

BACKGROUND

With the improvement of people's living standards, people's demand for daily electronic products, especially personal care products such as electric hair dryers, has gradually changed from single functionality to diversification, personalization and portability. Although the current electric hair dryer can meet the basic demand, the current electric hair dryer has obvious shortcomings in volume, weight, portability and other aspects, and cannot be suitable for some occasions that need portable use, especially occasions that electric hair dryers need to be carried frequently during traveling or on business trips. The volume of the existing electric hair dryer becomes a big burden for users.

SUMMARY

Based on this, it is necessary to provide an air duct assembly, a blowing device and an electric hair dryer in order to solve the problem that an electric hair dryer in related technologies is difficult to realize a miniaturized design due to internal structural problems.
One aspect of the present disclosure provides an air duct assembly, a blowing device and an electric blower. A first air inlet and an air outlet are formed in the air duct assembly. The air duct assembly is provided with a first passage, a first diversion passage, a second passage, a second diversion passage and a third passage. The first air inlet, the first passage, the first diversion passage, the second passage, the second diversion passage, the third passage and the air outlet are sequentially connected. The first passage is configured for conveying fluid to the first diversion passage along a first direction. The first diversion passage is configured for diverting the fluid entering from the first passage to a second direction and enabling the fluid to enter the second passage. The second passage is configured for diverting the fluid to the second diversion passage along the second direction. The second diversion passage is configured for diverting the fluid output from the second passage to a third direction and enabling the fluid to enter the third passage. The third passage is configured for diverting the fluid entering the third passage to the air outlet.
The first diversion passage and the second diversion passage in the air duct assembly effectively direct the fluid from the initial first direction to the final third direction through two times of diversion, and the fluid does not need to pass through a conventional straight long-distance flow passage. This diversion design greatly reduces the demand for length or space occupancy of the air duct assembly, thus achieving miniaturization.
Further, from the first air inlet to the air outlet, the fluid passes through a continuous flow passage structure of the first passage, the first diversion passage, the second passage, the second diversion passage and the third passage, thereby ensuring high efficiency and continuity of fluid flow. The structure of the air duct assembly compact can be compact, and unnecessary space occupation is reduced. In addition, the flow resistance is also reduced, and the fluid transmission efficiency is improved.
The air duct assembly disclosed in the present disclosure achieves significant improvement in miniaturization and compactness while the whole assembly keeps high performance through reasonable flow passage layout and diversion design. This optimized layout makes the air duct assembly be integrated into various devices or systems more easily. For example, when the air duct assembly is applied to the electric hair dryer, the structure of the electric hair dryer can be more compact and the miniaturized design of the electric hair dryer can be facilitated.
In one of the embodiments, 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 by 180 degrees before and after entering the first diversion passage. Since no additional complex diversion structure is needed to achieve the change of direction, not only can the structure within the flow passage be simplified, but also the miniaturization and compactness of the air duct assembly can be further promoted.
Further, the flow in opposite directions may make the air duct assembly more compact in the vertical or horizontal direction. For example, if the first passage is horizontally oriented and the second passage is horizontally oriented, the vertical space can be fully utilized by 180-degree diversion, thereby improving the overall flow passage length and performance without increasing horizontal dimensions. Furthermore, since the first direction is opposite to the second direction, the air duct assembly can be flexibly arranged in different installation environments. For example, if the space is limited, the air duct assembly can be designed as a "U" or "Z" shape to adapt specific installation needs.
In one of the embodiments, 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 the fluid flows through the second passage and enters the second diversion passage. This design allows the air duct assembly to achieve many times of diversion in a limited space without the need for additional long-distance flow passages, which significantly improves the structural compactness of the air duct assembly and makes the air duct assembly more suitable for integration into an electric hair dryer with a miniaturized design.
In one of the embodiments, an extension direction of the first direction is intersected with an extension direction of the second direction. Similarly, when the first direction is intersected with the second direction, the fluid can be allowed to change direction in a limited space without the need for an excessively long straight flow passage, thereby reducing the overall size of the air duct assembly and improving the compactness of the air duct assembly.
In one of the embodiments, an extension direction of the third direction is intersected with the extension direction of the second direction. When the third direction is intersected with the second direction, the fluid can be allowed to change direction in a limited space without the need for an excessively long straight flow passage, thereby reducing the overall size of the air duct assembly and improving the compactness of the air duct assembly.
Furthermore, an included angle between the third direction and the second direction, or an included angle between the first direction and the second direction, can be adjusted according to actual needs to achieve optimal fluid transport effect and space utilization.
In one of the embodiments, a boundary of a cross section, along an outlet direction, of the first diversion passage and/or the second diversion passage is a combination of one or more of an arc, a parabolic curve, a part of an elliptical curve and a hyperbolic curve with a straight line. Where, the use of the cross section in the shape of an arc, a parabolic curve, part of an elliptical curve or a hyperbolic curve can make the flow of the fluid in the diversion passage smoother, and the collision and friction between the fluid and a wall surface are reduced, such that the fluid resistance is reduced. The efficiency of fluid transport is improved, and energy loss generated by drag is reduced.
Further, the design of the boundary of the cross section in the shape of an arc or a curve helps to guide the fluid to be evenly distributed during diversion and reduce the formation of flow dead angles and vortices. It can be ensured that the fluid keeps a stable flow state when passing through the diversion passage, such that the stability and reliability of fluid transport are improved. Then, after passing through the arc, the parabolic curve, the part of the elliptical curve or the hyperbolic curve, the airflow can flow in the direction of the straight line, thus completing the diversion process of the fluid.
In other embodiments, the boundary of the cross section of the first diversion passage and/or the second diversion is a curve. The diversion passage formed by the curve helps to guide the fluid to change direction smoothly and reduce the direct collision and friction between the fluid and the wall surface. This design can significantly reduce the resistance generated by the fluid during the diversion process, thus improving the efficiency of fluid transport and reducing energy loss.
One aspect of the present disclosure provides an air duct assembly. The air duct assembly includes a first housing, a second housing and a third housing. An accommodation cavity and a first opening are formed in the first housing, and the accommodation cavity communicates with the first opening. The second housing is nested in an outer side of the first housing. A second opening and an air outlet are formed in two axial ends of the second housing respectively. The second opening and the first opening have a same open end direction. A first air inlet is formed in the third housing. The third housing covers the second opening. The third housing extends at least partially into the accommodation cavity. A second passage is formed between an inner side of the first housing and the third housing. A third passage is formed between the outer side of the first housing and the second housing. The second passage communicates with the third passage through the first opening to draw air into the air duct assembly from the first air inlet and discharge the air from the air duct assembly through the air outlet.
The first aspect of the present disclosure provides the air duct assembly. The second housing is nested in the outer side of the first housing, and the first opening formed in the first housing and the second opening formed in the second housing have the same direction, such that the third air passage is formed between the outer side of the first housing and the second housing. Further, the third housing is inserted into the accommodation cavity, and the third housing covers the second opening, such that the second passage is formed between the third housing and the inner side of the first housing. When outside air enters into the accommodation cavity of the second housing through the first air inlet, the outside air can flow to the third passage on the outer side along the second passage and then is discharged through the air outlet, such that the path of airflow circulation is improved. According to the air duct assembly in the present disclosure, the first housing and the second housing are nested inside and outside, and the third housing is nested and inserted in a cavity of the first housing, such that the second passage and the third passage can be formed on the inner and outer sides of the first housing, respectively. The first housing, the second housing and the third housing are arranged cooperatively, such that the structure of the whole air duct assembly can be more compact, and the space inside the air duct assembly is fully utilized. A circuitous air circulation path is formed among the housings, which is applied to the electric hair dryer to be beneficial to a miniaturized design of the body of the electric hair dryer.
Specifically, the first air inlet and the air outlet are respectively formed in two axial ends of the air duct assembly formed by combination of the first housing, the second housing, and the third housing, such that the air circulation path is further extended.
In one of the embodiments, the first housing and the second housing are integrally formed.
In one of the embodiments, the first housing and the third housing are integrally formed.
In one of the embodiments, the second housing and the third housing are integrally formed.
In one of embodiments, one axial end, extending into the first housing, of the third housing is spaced apart from the first housing to form a first diversion passage. The third housing is internally provided with a first passage communicating with the first air inlet. The first diversion passage communicates the first passage and the second passage. Specifically, the third housing is provided with two axial ends. An end, extending into first housing, of the one axial end of the third housing is spaced apart from an inner surface of the bottom of the first housing, such that the first diversion passage is formed. In this way, the airflow entering into the third housing body through the first air inlet can flow through the first diversion passage along the first passage, and then flows to the second passage. The first diversion passage can achieve smooth transition of the airflow before the airflow enters the second passage, thereby further reducing turbulence and resistance and improving the efficiency and stability of the airflow. On the other hand, since the resistance, generated by flow direction change, of the airflow when the airflow passes through the first diversion passage can be reduced, the energy efficiency of the entire air duct assembly is improved, and it is beneficial to allow the airflow to pass at a higher speed.
In one of the embodiments, a second diversion passage is formed between one end, provided with the first opening, of the first housing and an other axial end of the third housing, and the second diversion passage communicates the second passage and the third passage. Specifically, the other axial end of the third housing covers the second opening of the second housing. An end, provided with the first opening, of the first housing and a radial extension portion arranged at the other axial end of the third housing are arranged oppositely, and the second diversion passage is formed. Further, the second diversion passage can communicate the second passage and the third passage arranged inside and outside. In this way, the airflow can flow through the second diversion passage by means of the second passage, and then flows to the air outlet of the second housing along the direction of the third passage. The smooth transition of the airflow when the airflow flows through the second passage can be achieved, thereby further reducing turbulence and resistance and improving the efficiency and stability of the airflow. On the other hand, since the resistance, generated by flow direction change, of the airflow when the airflow passes through the second diversion passage can be reduced, the energy efficiency of the entire air duct assembly is improved, and it is beneficial to allow the airflow to pass at a higher speed.
In one of the embodiments, the first housing includes a first housing body and a blocking portion. The blocking portion is arranged at one axial end of the first housing body. The accommodation cavity is formed between the first housing body and the blocking portion. The first opening is formed in an other axial end of the first housing body. The third housing extends into the accommodation cavity through the first opening. The first housing is provided with an inner surface and an outer surface which are arranged relatively inside and outside. The second passage is formed between an inner surface of the first housing body and the third housing. The third passage is formed between an outer surface of the first housing body and the second housing. The accommodation cavity is formed by means of the combination of the first housing body and the blocking portion. The blocking portion is arranged at one axial end of the first housing body. In detail, as shown in FIG. 2, the first housing body has a cylindrical shape. The first opening is formed in one axial end of the first housing body, such that the third housing can be nested and inserted into the accommodation cavity through the first opening. In this way, the blocking portion can prevent the airflow from directly flowing out along an axial direction of the first housing body, which is beneficial to lengthening the air flow path. The second passage is formed between a portion, located in the accommodation cavity, of the third housing and the inner surface of the first housing body. The third passage is formed between the outer surface of the first housing body and the second housing. In this way, the second passage and the third passage arranged inside and outside can be formed at intervals by means of the arrangement of the first housing body, and the second passage and the third passage can communicate with each other through the second opening formed in the first housing body. In this way, the airflow enters the air duct assembly to flow, thereby forming a curved flow path, effectively utilizing the space in the air duct assembly and lengthening the air flow path.
In one of the embodiments, the second housing includes a second housing body and an air outlet portion. The air outlet portion is arranged at one axial end of the second housing body. The air outlet is formed in the air outlet portion. The second opening is formed in an other axial end of the second housing body. The third housing covers the second opening and is connected with the second housing body. The third passage is formed between the outer side of the first housing and an inner surface of the second housing body. Further, the air outlet portion is arranged at one axial end of the second housing body, and the air outlet is formed in the air outlet portion to make the airflow flow out. The second opening is formed in the other axial end of the second housing body. The third housing covers the second opening and is connected with the second housing body. In this way, an air inlet is avoided from being formed in the other axial end of the second housing body. The airflow can be avoided from directly entering into the second housing body through the second opening. The airflow can enter through the first air inlet of the third housing only and circulate along the circuitous passage formed by the second passage and the third passage.
In detail, the second housing body is of a cylindrical shape. The air outlet portion covers one axial end of the second housing body, and the air outlet formed in the air outlet portion is provided along an edge, connected with the second housing body, adjacent to the air outlet portion. In this way, the airflow of the third passage can be directly discharged through the air outlet more smoothly.
In one of the embodiments, the third housing includes a third housing body and a radial extension portion. The radial extension portion is arranged at one axial end of the third housing body and arranged convexly relative to a surface of the third housing body. The radial extension portion is nested in the second housing to block the second opening. The third housing body forms the first passage which is penetrated to form the first air inlet in the one axial end of the third housing body. An other axial end of the third housing body is nested and inserted in the accommodation cavity. The second passage is formed between the third housing body and the inner side of the first housing. The first passage which is penetrated is formed by the third housing body, such that the 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 nested and inserted into the accommodation cavity. Thus, the airflow can directly enter the first housing through the penetrating first passage, thereby optimizing the air entry path, reducing the resistance of air flow and improving the air suction efficiency of the electric hair dryer. The radial extension portion is arranged at one axial end of the third housing body and arranged convexly relative to a surface of the third housing body. The radial extension portion extends to the second housing from the surface of the third housing body, and is nested and arranged in the second housing to block the second opening, such that one axial end of the third housing body can enter into the air duct assembly through the first air inlet only, thereby lengthening the circulation path of the airflow in the air duct assembly.
In one of the embodiments, the air duct assembly further includes a seal ring. The seal ring is sleeved on the radial extension portion. The seal ring is abutted between the radial extension portion and the second housing to seal a gap between the radial extension portion and the second housing. By enabling the seal ring to sleeve the radial extension portion and abut between the radial extension portion and the second housing, the gap between the radial extension portion and the second housing can be effectively sealed, thereby significantly enhancing the tightness of the entire air duct assembly, preventing air leakage in the flow process, and ensuring that the electric hair dryer can generate stable airflow. In addition, one axial end of the third housing body can enter into the air duct assembly only through the first air inlet, thereby lengthening the circulation path of the airflow in the air duct assembly. On the other hand, the seal ring can be tightly laminated between the radial extension portion and the second housing, and vibration can be absorbed and reduced to a certain extent, thereby reducing the noise level and improving the comfort of use.
In one of the embodiments, one of the radial extension portion and the second housing is provided with a limit rib, and an other of the radial extension portion and the second housing is provided with a limit slot. The limit rib is adapted with the limit slot. By arranging the limit rib to be adapted with the limit slot, the radial extension portion and the second housing can be accurately aligned and firmly connected together during assembly. In some specific embodiments, the radial extension portion is provided with a limit rib, and the second housing is provided with a limit slot. In detail, the limit rib adapted with the limit slot is arranged on an outer surface of the radial extension portion, and the limit slot is arranged on an inner wall or an edge of the second housing. The connecting structure is simple and effective, such that the assembly efficiency of the air duct assembly can be improved, and the stability and reliability of the structure can also be enhanced.
In one of the embodiments, where the first passage of the third housing body is configured for installing a fan. By installing the fan in the first passage of the third housing body, tight integration of the fan and the air duct assembly is achieved. Specifically, the fan is installed in the first passage, such that the third housing can directly draw air through the first air inlet. Then, the air circulates along the circuitous path formed by the second passage and the third passage inside an air duct housing. Finally, the air is blown out through the air outlet in the second housing, thereby lengthening the airflow passage in the compact space.
In one of the embodiments, the air duct assembly further includes a heating assembly. The heating assembly is installed in the second passage or the third passage. By additionally arranging the heating assembly in the air duct assembly, the heating assembly can be configured for heating the airflow flowing through the second passage or the third passage, such that the temperature of the airflow at the air outlet is increased. Further, the heating assembly is arranged in the second passage or the third passage, such that the overall structure of the air duct assembly can be more compact, the space in the air duct assembly is fully utilized, and the miniaturization design of the electric hair dryer is facilitated. Specifically, the heating assembly is arranged in the third passage, and better heating efficiency can be achieved.
In one of the embodiments, the air duct assembly further includes a mounting bracket. The mounting bracket is arranged on the first housing or the second housing. The mounting bracket is located in the third passage. The mounting bracket is configured for mounting the heating assembly. By arranging the mounting bracket, the heating assembly can be firmly fixed in the third passage, thereby reducing performance degradation or safety risks caused by vibration or movement of the air duct assembly in the using process.
In one of the embodiments, the mounting bracket includes multiple support members. The heating assembly is arranged on the support members. The support members are spaced apart along the outer surface of the first housing. The first housing is provided with necks. Each of the support member is provided with a convex rib. At least portion of the convex rib is located in a corresponding one of the necks. The support members are spaced apart along the outer surface of the first housing, such that the heating assembly can be distributed along the outer surface of the first housing, which is beneficial to uniformly heating the third passage and improving the temperature stability performance at the air outlet. The arrangement of the support members provides a stable support structure for the heating assembly, such that the position of the heating assembly can be fixed in the air duct assembly, thereby reducing the risk of displacement or damage due to vibration or impact. Further, the neck arranged on the first housing is matched with the convex rib on the support member, such that the support member can be easily installed on the first housing, and the positional accuracy of the support member is ensured, such that the installation process is simplified, and the production efficiency is improved. Furthermore, by designing the mounting bracket to be composed of a plurality of support members, the mounting bracket is more flexible. The number of support members can be increased or decreased as needed to adapt heating assemblies of different sizes and weights.
More specifically, the heating assembly adopts heating wires, and the heating wire can be wound around each support member. Uniform heating can be performed on the third passage.
In one of the embodiments, the mounting bracket further includes a heat insulation member. The heat insulation member is nested in the second housing. The heat insulation member is located between the heating assembly and the second housing. By arranging the heat insulation member, direct contact between heat generated by the heating assembly and the second housing can be effectively isolated. This design reduces the temperature of the second housing, such that the loss of the heat to the external environment is reduced, and the utilization efficiency of heat energy is improved. Further, since the loss of the heat to the outside is reduced, when the air duct assembly is applied to an electric hair dryer, the heat insulation member can also prevent the air outlet portion from overheating to reduce the risk of scalding the user. In detail, the heat insulation member is a cylindrical portion, and the outside of the second housing is wrapped around an inner cavity of the cylindrical portion.
The second aspect of the present disclosure provides a blowing device. The blowing device includes an outer housing, the air duct assembly according to any one of the above embodiments and a fan. A second air inlet and a mounting cavity are formed in the outer housing. The air duct assembly is arranged on the outer housing, and the air duct assembly is at least partially located in the mounting cavity. The fan is arranged on the third housing. The fan is located in the first passage of the third housing. The fan is configured to draw air into the outer housing from the second air inlet and guide the air along the third housing before being discharged through the air outlet.
The second aspect of the present disclosure provides a blowing device. The mounting cavity formed in the outer housing can be configured for installing the air duct assembly. A second air inlet is formed in the outer housing. The second air inlet is matched with the air duct assembly to allow sufficient air to enter into the device. Compared with independent arrangement of the fan in related technologies, in the present disclosure, by arranging the fan in the first passage of the third housing of the air duct assembly, the space for installing the fan can be saved, thereby greatly reducing the axial length of the blowing device, reducing the size of the entire blowing device and realizing a miniaturized design. Further, the second passage and the third passage are arranged on the air duct assembly to form a circuitous airflow path, and the second passage or the third passage may be internally provided with the heating assembly, thereby facilitating the formation of an efficient and uniform heating effect on the airflow.
The second aspect of the present disclosure provides an electric hair dryer. The electric hair dryer includes a handle assembly and the blowing device according to any one of the above embodiments. The handle assembly is arranged on the blowing device. The handle assembly can provide convenience in holding and operating the electric hair dryer for the user such that the user can hold and operate the electric hair dryer comfortably. By using the blowing device in any one of the above embodiments, the integral design of the electric hair dryer can be more miniaturized, such that the portability and storage and using convenience of the electric hair dryer are improved.
In one of the embodiments, a hole communicating with the first air inlet of the air duct assembly is formed in a joint of the blowing device and the handle assembly. A third air inlet is formed in the handle assembly. The handle assembly is internally provided with a circuit board assembly. The third air inlet communicates with the hole to draw air along the third air inlet such that the airflow passes through the circuit board assembly. By forming the hole communicating with the first air inlet of the air duct assembly in the joint between the blowing device and the handle assembly, the airflow can pass through the third air inlet of the handle assembly and enter the handle assembly. In this process, the airflow can take away the heat generated by operation through the circuit board assembly, thereby achieving a heat dissipation function of the circuit board assembly, helping to reduce the temperature of the circuit board assembly and improving the stability and reliability of the circuit board assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a first space diagram of an electric hair dryer according to an embodiment of the present disclosure.
FIG. 2 is a second space diagram of the electric hair dryer according to the embodiment of the present disclosure.
FIG. 3 is a sectional drawing of the electric hair dryer according to the embodiment of the present disclosure.
FIG. 4 is a first space diagram of an air duct assembly in according to the embodiment of the present disclosure.
FIG. 5 is a second space diagram of the air duct assembly according to the embodiment of the present disclosure.
FIG. 6 is a sectional drawing of a first housing, a second housing and a third housing.
FIG. 7 is an exploded view of the air duct assembly according to the embodiment of the present disclosure.
FIG. 8 is an exploded sectional drawing of the air duct assembly according to the embodiment of the present disclosure.
FIG. 9 is a space diagram of the first housing according to the embodiment of the present disclosure.
FIG. 10 is a first space diagram of the second housing according to the embodiment of the present disclosure.
FIG. 11 is a second space diagram of the second housing according to the embodiment of the present disclosure.
FIG. 12 is a space diagram of the third housing according to the embodiment of the present disclosure.

The corresponding relationship of reference signs in drawings and part names is as follows:

100 air duct assembly;
1 first housing; 101 accommodation cavity; 102 first opening; 103 second passage; 104 third passage; 105 neck; 106 first diversion passage; 107 second diversion passage; 11 first housing body; 12 blocking portion;
2 second housing; 201 second opening; 202 air outlet; 203 limit slot; 21 second housing body; 22 air outlet portion;
3 third housing; 301 first air inlet; 302 first passage; 31 third housing body; 32 radial extension portion; 33 limit rib;
4 seal ring;
5 heating assembly;
6 support member;
7 heat insulation member;
300 outer housing; 3001 second air inlet;
400 fan;
500 handle assembly; 5001 hole; 5002 third air inlet;
600 circuit board assembly.

DETAILED DESCRIPTION OF THE EMBODIMENTS

To make the foregoing objective, features and advantages of the present disclosure clearer and more comprehensible, the present disclosure is further described in detail below with reference to the drawings and specific embodiments. It needs to be illustrated that, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.
Numerous specific details are set forth in the following description to provide thorough understanding of the present disclosure, but the present disclosure may be implemented otherwise than as described herein, and therefore, the scope of the present disclosure is not limited by the specific embodiments disclosed below.
Hereinafter, an air duct assembly 100, a blowing device 200 and an electric hair dryer according to some embodiments of the present disclosure are described with reference to the drawings.

Embodiment I

Referring to FIG. 4 to FIG. 6, one aspect of the present disclosure provides an air duct assembly. A first air inlet 301 and an air outlet 202 are formed in the air duct assembly. The air duct assembly is provided with a first passage 302, a first diversion passage 106, a second passage 103, a second diversion passage 107 and a third passage 104. The first air inlet 301, the first passage 302, the first diversion passage 106, the second passage 103, the second diversion passage 107, the third passage 104 and the air outlet 202 are sequentially connected. The first passage 302 is configured for conveying fluid to the first diversion passage 106 along a first direction. The first diversion passage 106 is configured for diverting the fluid entering from the first passage 302 to a second direction and enabling the fluid to enter the second passage 103. The second passage 103 is configured for diverting the fluid to the second diversion passage 107 along the second direction. The second diversion passage 107 is configured for diverting the fluid output from the second passage 103 to a third direction and enabling the fluid to enter the third passage 104. The third passage 104 is configured for diverting the fluid to the air outlet 202.
The first diversion passage 106 and the second diversion passage 107 in the air duct assembly effectively direct the fluid from the initial first direction to the final third direction through two times of diversion, and the fluid does not need to pass through a conventional straight long-distance flow passage. This diversion design greatly reduces the demand for length or space occupancy of the air duct assembly, thus achieving miniaturization.
Further, from the first air inlet 301 to the air outlet 202, the fluid passes through a continuous flow passage structure of the first passage 302, the first diversion passage 106, the second passage 103, the second diversion passage 107 and the third passage 104, thereby ensuring high efficiency and continuity of fluid flow. The structure of the air duct assembly compact can be compact, and unnecessary space occupation is reduced. In addition, the flow resistance is also reduced, and the fluid transmission efficiency is improved.
The air duct assembly disclosed in the present disclosure achieves significant improvement in miniaturization and compactness while the whole assembly keeps high performance through reasonable flow passage layout and diversion design. This optimized layout makes the air duct assembly be integrated into various devices or systems more easily. For example, when the air duct assembly is applied to the electric hair dryer, the structure of the electric hair dryer can be more compact and the miniaturized design of the electric hair dryer can be facilitated.
In one of the embodiments, 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 by 180 degrees before and after entering the first diversion passage 106. Since no additional complex diversion structure is needed to achieve the change of direction, not only can the structure within the flow passage be simplified, but also the miniaturization and compactness of the air duct assembly can be further promoted.
Referring to FIG. 6, within the corresponding passage, the first direction, the second direction and the third direction can be understood with reference to the flow direction of airflow.
Further, the flow in opposite directions may make the air duct assembly more compact in the vertical or horizontal direction. For example, if the first passage 302 is horizontally oriented and the second passage 103 is horizontally oriented, the vertical space can be fully utilized by 180-degree diversion, thereby improving the overall flow passage length and performance without increasing horizontal dimensions. Furthermore, since the first direction is opposite to the second direction, the air duct assembly can be flexibly arranged in different installation environments. For example, if the space is limited, the air duct assembly can be designed as a "U" or "Z" shape to adapt specific installation needs.
In one of the embodiments, 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 the fluid flows through the second passage 103 and enters the second diversion passage 107. This design allows the air duct assembly to achieve many times of diversion in a limited space without the need for additional long-distance flow passages, which significantly improves the structural compactness of the air duct assembly and makes the air duct assembly more suitable for integration into an electric hair dryer with a miniaturized design.
In one of the embodiments, an extension direction of the first direction is intersected with an extension direction of the second direction. Similarly, when the first direction is intersected with the second direction, the fluid can be allowed to change direction in a limited space without the need for an excessively long straight flow passage, thereby reducing the overall size of the air duct assembly and improving the compactness of the air duct assembly.
In one of the embodiments, an extension direction of the third direction is intersected with the extension direction of the second direction. When the third direction is intersected with the second direction, the fluid can be allowed to change direction in a limited space without the need for an excessively long straight flow passage, thereby reducing the overall size of the air duct assembly and improving the compactness of the air duct assembly.
Furthermore, an included angle between the third direction and the second direction, or an included angle between the first direction and the second direction, can be adjusted according to actual needs to achieve optimal fluid transport effect and space utilization.
In one of the embodiments, a boundary of a cross section, along an outlet direction, of the first diversion passage 106 and/or the second diversion passage 107 is a combination of one or more of an arc, a parabolic curve, a part of an elliptical curve and a hyperbolic curve with a straight line. The use of the cross section in the shape of an arc, a parabolic curve, part of an elliptical curve or a hyperbolic curve can make the flow of the fluid in the diversion passage smoother, and the collision and friction between the fluid and a wall surface are reduced, such that the fluid resistance is reduced. The efficiency of fluid transport is improved, and energy loss generated by drag is reduced.
Further, the design of the boundary of the cross section in the shape of an arc or a curve helps to guide the fluid to be evenly distributed during diversion and reduce the formation of flow dead angles and vortices. It can be ensured that the fluid keeps a stable flow state when passing through the diversion passage, such that the stability and reliability of fluid transport are improved. Then, after passing through the arc, the parabolic curve, the part of the elliptical curve or the hyperbolic curve, the airflow can flow in the direction of the straight line, thus completing the diversion process of the fluid.
In other embodiments, the boundary of the cross section, along an outlet direction, of the first diversion passage 106 and/or the second diversion passage 107 is a curve. The diversion passage formed by the curve helps to guide the fluid to change direction smoothly and reduce the direct collision and friction between the fluid and the wall surface. This design can significantly reduce the resistance generated by the fluid during the diversion process, thus improving the efficiency of fluid transport and reducing energy loss.
Referring to FIG. 4 to FIG. 9, the embodiment discloses an air duct assembly 100. The air duct assembly 100 includes a first housing 1, a second housing 2 and a third housing 3. An accommodation cavity 101 and a first opening 102 are formed in the first housing 1, and the accommodation cavity 101 communicates with the first opening 102. The second housing 2 is nested in an outer side of the first housing 1. A second opening 201 and an air outlet 202 are formed in two axial ends of the second housing 2 respectively. The second opening 201 and the first opening 102 have a same open end direction. A first air inlet 301 is formed in the third housing 3. The third housing 3 covers the second opening 201. The third housing 3 extends at least partially into the accommodation cavity 101. A second passage 103 is formed between an inner side of the first housing 1 and the third housing 3. A third passage 104 is formed between the outer side of the first housing 1 and the second housing 2. The second passage 103 communicates with the third passage 104 through the first opening 102 to draw air into the air duct assembly 100 from the first air inlet 301 and discharge the air from the air duct assembly through the air outlet 202.
The first aspect of the present disclosure provides the air duct assembly 100. The second housing 2 is nested in the outer side of the first housing 1, and the first opening 102 formed in the first housing 1 and the second opening 201 formed in the second housing 2 have the same direction, such that the third passage is formed between the outer side of the first housing 1 and the second housing 2. Further, the third housing 3 is inserted into the accommodation cavity 101, and the third housing 3 covers the second opening 201, such that the second passage 103 is formed between the third housing 3 and the inner side of the first housing 1. When outside air enters into the accommodation cavity 101 of the second housing 2 through the first air inlet 301, the outside air can flow to the third passage on the outer side along the second passage 103 and then is discharged through the air outlet 202, such that the path of airflow circulation is improved. According to the air duct assembly 100 in the present disclosure, the first housing 1 and the second housing 2 are nested inside and outside, and the third housing 3 is nested and inserted in a cavity of the first housing 1, such that the second passage and the third passage can be formed on the inner and outer sides of the first housing 1, respectively. The first housing 1, the second housing 2 and the third housing 3 are arranged cooperatively, such that the structure of the whole air duct assembly 100 can be more compact, and the space inside the air duct assembly 100 is fully utilized. A circuitous air circulation path is formed among the housings, which is applied to the electric hair dryer to be beneficial to a miniaturized design of the body of the electric hair dryer 400.
As shown in FIG. 6, specifically, the first air inlet 301 and the air outlet 202 are respectively formed in two axial ends of the air duct assembly 100 formed by combination of the first housing 1, the second housing 2, and the third housing 3, such that the air circulation path is further extended.
In addition to the features of the above embodiments, the embodiment further defines that the first housing 1 and the second housing 2 are integrally formed.
In addition to the features of the above embodiments, the embodiment further defines that the first housing 1 and the third housing 3 are integrally formed.
In addition to the features of the above embodiments, the embodiment further defines that the second housing 2 and the third housing 3 are integrally formed.
As shown in FIG. 3 and FIG. 6, one axial end of the third housing 3 is arranged adjacent to a rear side wall inside the first housing 1, and an end of the third housing 3 is spaced apart from an inner surface of the first housing 1.
As shown in FIG. 3 and FIG. 6, in addition to the features of the above embodiments, the embodiment further defines that one axial end, extending into the first housing 1, of the third housing 3 is spaced apart from the first housing 1 to form a first diversion passage 106. The third housing 3 is internally provided with a first passage 302 communicating with the first air inlet 301. The first diversion passage 106 communicates the first passage 302 and the second passage 103.
Specifically, the third housing 3 is provided with two axial ends. An end, extending into the first housing 1, of one axial end of the third housing 3 is spaced apart from an inner surface of the bottom of the first housing 1, such that the first diversion passage 106 is formed. In this way, the airflow entering into the third housing 3 through the first air inlet 301 can flow through the first diversion passage 106 along the first passage 302, and then flows to the second passage 103. The first diversion passage 106 can achieve smooth transition of the airflow before the airflow enters 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 resistance, generated by flow direction change, of the airflow when the airflow passes through the first diversion passage 106 can be reduced, the energy efficiency of the entire air duct assembly is improved, and it is beneficial to allow the airflow to pass at a higher speed.
As shown in FIG. 6, at least part of the inner surface of the bottom of the first housing 1 is in the shape of a cambered surface, and the cambered surface at the bottom of the first housing 1 and the third housing 3 are enclosed to form the first diversion passage 106.
As shown in FIG. 3 and FIG. 6, in addition to the features of the above embodiments, the embodiment further defines that a second diversion passage 107 is formed between one end, provided with the first opening 102, of the first housing 1 and the other axial end of the third housing 3, and the second diversion passage 107 communicates the second passage 103 and the third passage 104.
Specifically, the other axial end of the third housing 3 covers the second opening of the second housing. An end, provided with the first opening 102, of the first housing 1 and a radial extension portion 32 arranged at the other axial end of the third housing 3 are arranged oppositely, and the second diversion passage 107 is formed. Further, the second diversion passage 107 can communicate the second passage 103 and the third passage 104 arranged inside and outside. In this way, the airflow can flow through the second diversion passage 107 by means of the second passage 103, and then flows to the air outlet 202 of the second housing 2 along the direction of the third passage 104. The smooth transition of the airflow when the airflow flows through the second passage 107 can be achieved, thereby further reducing turbulence and resistance and improving the efficiency and stability of the airflow. On the other hand, since the resistance, generated by flow direction change, of the airflow when the airflow passes through the second diversion passage 107 can be reduced, the energy efficiency of the entire air duct assembly is improved, and it is beneficial to allow the airflow to pass at a higher speed.
As shown in FIG. 6, at least part of an inner surface, arranged oppositely to the first housing 1, of the third housing 3 is in the shape of a cambered surface, and the cambered surface of the third housing 3 and an end of the first housing 1 are enclosed to form the second diversion passage 107.
It is understandable that the second passage 103 and the third passage 104 have opposite airflow directions.
As shown in FIG. 6, FIG. 7, FIG. 8 and FIG. 9, in addition to the features of the above embodiments, the embodiment further defines that the first housing 1 includes a first housing body 11 and a blocking portion 12. The blocking portion 12 is arranged at one axial end of the first housing body 11. The accommodation cavity 101 is formed between thefirst housing body 11 and the blocking portion 12. The first opening 102 is formed in the other axial end of the first housing body 11. The third housing 3 extends into the accommodation cavity 101 through the first opening 102. The first housing 1 is provided with an inner surface and an outer surface which are arranged relatively inside and outside. The second passage 103 is formed between an inner surface of the first housing body 11 and the third housing 3. The third passage 104 is formed between an outer surface of the first housing body 11 and the second housing 2. The accommodation cavity 101 is enclosed by means of the combination of the first housing body 11 and the blocking portion 12, the blocking portion 12 is arranged at one axial end of the first housing body 11.
In detail, as shown in FIG. 9, the first housing body 11 has a cylindrical shape. The first opening 102 is formed in one axial end of the first housing body 11, such that the third housing 3 can be nested and inserted into the accommodation cavity 101 through the first opening 102. In this way, the blocking portion 12 can prevent the airflow from directly flowing out along an axial direction of the first housing body 11, which is beneficial to lengthening the air flow path. The second passage 103 is formed between a portion, located in the accommodation cavity 101, of the third housing 3 and the inner surface of the first housing body 11. The third passage 104 is formed between the outer surface of the first housing body 11 and the second housing 2. In this way, the second passage 103 and the third passage 104 arranged inside and outside can be formed at intervals by means of the arrangement of the first housing body 11, and the second passage 103 and the third passage 104 can communicate with each other through the second opening 201 formed in the first housing body 11. The airflow enters the air duct assembly 100 to flow, thereby forming a curved flow path, effectively utilizing the space in the air duct assembly 100 and lengthening the air flow path.
As shown in FIG. 9 to FIG. 11, in addition to the features of the above embodiments, the embodiment further defines that the second housing 2 includes a second housing body 21 and an air outlet portion 22. The air outlet portion 22 is arranged at one axial end of the second housing body 21. The air outlet 202 is formed in the air outlet portion 22. The second opening 201 is formed in the other axial end of the second housing body 21. The third housing 3 covers the second opening 201 and is connected with the second housing body 21. The third passage 104 is formed between the outer side of the first housing 1 and an inner surface of the second housing body 21.
The air outlet portion 22 is arranged at one axial end of the second housing body 21, and the air outlet 202 is formed in the air outlet portion 22 to make the airflow flow out. The second opening 201 is formed in the other axial end of the second housing body 21. The third housing 3 covers the second opening 201 and is connected with the second housing body 21. In this way, an air inlet is avoided from being formed in the other axial end of the second housing body 21. The airflow can be avoided from directly entering into the second housing body 21 through the second opening 201. The airflow can enter through the first air inlet 301 of the third housing only and circulate along the circuitous passage formed by the second passage 103 and the third passage 104.
In detail, the second housing body 21 is of a cylindrical shape. The air outlet portion 22 covers one axial end of the second housing body 21, and the air outlet 202 formed in the air outlet portion 22 is provided along an edge, connected with the second housing body 21, adjacent to the air outlet portion 22. In this way, the airflow of the third passage 104 can be directly discharged through the air outlet 202 more smoothly.
As shown in FIG. 6 to FIG. 12, in addition to the features of the above embodiments, the embodiment further defines that the third housing 3 includes a third housing body 31 and a radial extension portion 32. The radial extension portion 32 is arranged at one axial end of the third housing body 31 and arranged convexly relative to a surface of the third housing body 31. The radial extension portion 32 is nested in the second housing 2 to block the second opening 201. The third housing body 31 forms the penetrating first passage 302 to form the first air inlet 301 in one axial end of the third housing body 31. The other axial end of the third housing body 31 is nested and inserted in the accommodation cavity 101. The second passage 103 is formed between the third housing body 31 and the inner side of the first housing 1. The penetrating first passage 302 is formed by the third housing body 31, such that the first air inlet 301 is formed on one axial end of the third housing body 31, and the other axial end of the third housing body 31 is nested and inserted into the accommodation cavity 101. Thus, the airflow can directly enter the first housing through the penetrating first passage 302, thereby optimizing the air entry path, reducing the resistance of air flow and improving the air suction efficiency of the electric hair dryer.
Further, the radial extension portion 32 is arranged at one axial end of the third housing body 31 and arranged convexly relative to a surface of the third housing body 31. The radial extension portion 32 extends to the second housing 2 from the surface of the third housing body 31, and is nested and arranged in the second housing 2 to block the second opening 201, such that one axial end of the third housing body 31 can enter into the air duct assembly 100 through the first air inlet 301 only, thereby lengthening the circulation path of the airflow in the air duct assembly 100.
As shown in FIG. 3, in addition to the features of the above embodiments, the embodiment further defines that the air dust assembly also includes a seal ring 4. The seal ring 4 sleeves the radial extension portion 32. The seal ring 4 is abutted between the radial extension portion 32 and the second housing 2 to seal a gap between the radial extension portion 32 and the second housing 2. By enabling the seal ring 4 to sleeve the radial extension portion 32 and abut against the portion between the radial extension portion 32 and the second housing 2, the gap between the radial extension portion 32 and the second housing 2 can be effectively sealed, thereby significantly enhancing the tightness of the entire air duct assembly 100, preventing air leakage in the flow process, and ensuring that the electric hair dryer can generate stable airflow. In addition, one axial end of the third housing body 31 can enter into the air duct assembly 100 through the first air inlet 301 only, thereby lengthening the circulation path of the airflow in the air duct assembly 100.
On the other hand, the seal ring 4 can be tightly laminated between the radial extension portion 32 and the second housing 2, and vibration can be absorbed and reduced to a certain extent, thereby reducing the noise level and improving the comfort of use.
As shown in FIG. 4, FIG. 10 and FIG. 12, in addition to the features of the above embodiments, the embodiment further defines that one of the radial extension portion 32 and the second housing 2 is provided with a limit rib 33, and the other of the radial extension portion 32 and the second housing 2 is provided with a limit slot 203. The limit rib 33 is adapted with the limit slot 203. By arranging the limit rib 33 to be adapted with the limit slot 203, the radial extension portion 32 and the second housing 2 can be accurately aligned and firmly connected together during assembly.
In some specific embodiments, the radial extension portion 32 is provided with a limit rib 33, and the second housing 2 is provided with a limit slot 203. In detail, the limit rib 33 adapted with the limit slot 203 is arranged on an outer surface of the radial extension portion 32, and the limit slot 203 is arranged on an inner wall or an edge of the second housing 2. The connecting structure is simple and effective, such that the assembly efficiency of the air duct assembly 100 can be improved, and the stability and reliability of the structure can also be enhanced.
As shown in FIG. 3, in addition to the features of the above embodiments, the embodiment further defines that the first passage 302 of the third housing body 31 is configured for installing a fan 400. By installing the fan 400 in the first passage 302 of the third housing body 31, tight integration of the fan 400 and the air duct assembly 100 is achieved. Specifically, the fan 400 is installed in the first passage 302, such that the third housing 3 can directly draw air through the first air inlet 301. Then, the air circulates along the circuitous path formed by the second passage 103 and the third passage 104 inside an air duct housing. Finally, the air is blown out through the air outlet 202 in the second housing 2, thereby lengthening the airflow passage in the compact space.
As shown in FIG. 3, in addition to the features of the above embodiments, the embodiment further defines that the air duct assembly also includes a heating assembly 5. The heating assembly 5 is installed in the second passage 103 or the third passage 104. By additionally arranging the heating assembly 5 in the air duct assembly 100, the heating assembly 5 can be configured for heating the airflow flowing through the second passage 103 or the third passage 104, such that the temperature of the airflow at the air outlet 202 is increased.
Further, the heating assembly 5 is arranged in the second passage 103 or the third passage 104, such that the overall structure of the air duct assembly 100 can be more compact, the space in the air duct assembly 100 is fully utilized, and the miniaturization design of the electric hair dryer is facilitated. Specifically, the heating assembly 5 is arranged in the third passage 104, and better heating efficiency can be achieved.
As shown in FIG. 6 and FIG. 7, in addition to the features of the above embodiments, the embodiment further defines that the air duct assembly also includes a mounting bracket. The mounting bracket is arranged on the first housing 1 or the second housing 2. The mounting bracket is located in the third passage 104. The mounting bracket is configured for mounting the heating assembly 5. By arranging the mounting bracket, the heating assembly 5 can be firmly fixed in the third passage 104, thereby reducing performance degradation or safety risks caused by vibration or movement of the air duct assembly 100 in the using process.
As shown in FIG. 7 to FIG. 9, in addition to the features of the above embodiments, the embodiment further defines that the mounting bracket includes multiple support members 6. The heating assembly 5 is arranged 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 necks 105. The support member 6 is provided with a convex rib. At least part of the convex rib is located in the neck 105. The support members 6 are spaced apart along the outer surface of the first housing 1, such that the heating assembly 5 can be distributed along the outer surface of the first housing 1, which is beneficial to uniformly heating the third passage 104 and improving the temperature stability performance at the air outlet. The arrangement of the support members 6 provides a stable support structure for the heating assembly 5, such that the position of the heating assembly 5 can be fixed in the air duct assembly 100, thereby reducing the risk of displacement or damage due to vibration or impact.
Further, the neck 105 arranged on the first housing 1 is matched with the convex rib on the support member 6, such that the support member 6 can be easily installed on the first housing, and the positional accuracy of the support member is ensured, such that the installation process is simplified, and the production efficiency is improved. Furthermore, by designing the mounting bracket to be composed of a plurality of support members 6, the mounting bracket is more flexible. The number of support members 6 can be increased or decreased as needed to adapt heating assemblies 5 of different sizes and weights.
More specifically, the heating assembly 5 adopts heating wires, and the heating wire can be wound around each support member 6. Uniform heating can be performed on the third passage 104.
As shown in FIG. 7 and FIG. 8, in addition to the features of the above embodiments, the embodiment further defines that the air duct assembly further includes a heat insulation member 7. The heat insulation member 7 is nested in the second housing 2. The heat insulation member 7 is located between the heating assembly 5 and the second housing 2. By arranging the heat insulation member 7, direct contact between heat generated by the heating assembly 5 and the second housing 2 can be effectively isolated. This design reduces the temperature of the second housing 2, such that the loss of the heat to the external environment is reduced, and the utilization efficiency of heat energy is improved. Further, since the loss of the heat to the outside is reduced, when the air duct assembly 100 is applied to an electric hair dryer, the heat insulation member 7 can also prevent the air outlet portion 22 from overheating to reduce the risk of scalding the user. In detail, the heat insulation member 7 is a cylindrical portion, and the outside of the second housing is wrapped around an inner cavity of the cylindrical portion.

Embodiment II

As shown in FIG. 3, the embodiment discloses a blowing device. The blowing device includes an outer housing 300, the air duct assembly 100 according to any one of the above embodiments and a fan 400. A second air inlet 3001 and a mounting cavity are formed in the outer housing 300. The air duct assembly 100 is arranged on the outer housing 300, and the air duct assembly 100 is at least partially located in the mounting cavity. The fan 400 is arranged on the third housing 3. The fan 400 is located in the first passage 302 of the third housing 3. The fan 400 is configured to draw air into the outer housing 300 from the second air inlet 3001 and guide the air along the third housing 3 before being discharged through the air outlet 202.
The second aspect of the present disclosure provides a blowing device. The mounting cavity formed in the outer housing can be configured for installing the air duct assembly 100. A second air inlet 3001 is formed in the outer housing 300. The second air inlet 3001 is matched with the air duct assembly 100 to allow sufficient air to enter into the device. Where, compared with independent arrangement of the fan 400 in related technologies, in the present disclosure, by arranging the fan 400 in the first passage 302 of the third housing 3 of the air duct assembly 100, the space for installing the fan 400 can be saved, thereby greatly reducing the axial length of the blowing device, reducing the size of the entire blowing device and realizing a miniaturized design. Further, the second passage 103 and the third passage 104 are arranged on the air duct assembly 100 to form a circuitous airflow path, and the second passage 103 or the third passage 104 may be internally provided with the heating assembly 5, thereby facilitating the formation of an efficient and uniform heating effect on the airflow.

Embodiment III

As shown in FIG. 1 to FIG. 2, the embodiment discloses an electric hair dryer. The electric hair dryer includes a handle assembly 500 and the blowing device according to any one of the above embodiments. The handle assembly 500 is arranged on the blowing device.
The third aspect of the present disclosure provides an electric hair dryer. Where the handle assembly 500 can provide convenience in holding and operating the electric hair dryer for the user such that the user can hold and operate the electric hair dryer comfortably. By using the blowing device in any one of the above embodiments, the integral design of the electric hair dryer can be more miniaturized, such that the portability and storage and using convenience of the electric hair dryer are improved.
As shown in FIG. 3, in addition to the features of the above embodiments, the embodiment further defines that a hole 5001 communicating with the first air inlet 301 of the air duct assembly 100 is formed in a joint of the blowing device and the handle assembly 500. A third air inlet 5002 is formed in the handle assembly. The handle assembly is internally provided with a circuit board assembly 600. The third air inlet 5002 communicates with the hole 5001 to draw air along the third air inlet 5002 such that the airflow passes through the circuit board assembly 600. By forming the hole 5001 communicating with the first air inlet 301 of the air duct assembly 100 in the joint between the blowing device and the handle assembly 500, the airflow can pass through the third air inlet 5002 of the handle assembly 500 and enter the handle assembly 500. In this process, the airflow can take away the heat generated by operation through the circuit board assembly 600, thereby achieving a heat dissipation function of the circuit board assembly 600, helping to reduce the temperature of the circuit board assembly 600 and improving the stability and reliability of the circuit board assembly 600.
The technical features of the above-mentioned embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-mentioned embodiments are not described for simplicity of description. However, as long as the combinations of the technical features do not contradict one another, the technical features should be considered to be within the scope of the description of the present disclosure.
The above embodiments only express several embodiments of the present disclosure, and the description is specific and detailed, but cannot be construed as limiting the claims of the present disclosure. It should be noted that several modifications and improvements may also be made to those skilled in the art without departing from the inventive concept, which fall within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

An air duct assembly, wherein
a first air inlet (301) and an air outlet (202) are formed in the air duct assembly;

wherein the air duct assembly is provided with a first passage (302), a first diversion passage (106), a second passage (103), a second diversion passage (107) and a third passage (104);

wherein the first air inlet (301), the first passage (302), the first diversion passage (106), the second passage (103), the second diversion passage (107), the third passage (104) and the air outlet (202) are sequentially connected;

wherein the first passage (302) is configured for conveying fluid to the first diversion passage (106) along a first direction;

wherein the first diversion passage (106) is configured for diverting the fluid entering from the first passage (302) to a second direction and enabling the fluid to enter the second passage (103);

wherein the second passage (103) is configured for diverting the fluid to the second diversion passage (107) along the second direction;

wherein the second diversion passage (107) is configured for diverting the fluid output from the second passage (103) to a third direction and enabling the fluid to enter the third passage (104); and

wherein the third passage (104) is configured for diverting the fluid entering the third passage (104) to the air outlet (202).
The air duct assembly according to claim 1, wherein
the first direction is opposite to the second direction;

and/or wherein the third direction is opposite to the second direction.
The air duct assembly according to claim 1, wherein
the extension direction of the first direction is intersected with the extension direction of the second direction;

and/or an extension direction of the third direction is intersected with an extension direction of the second direction.
The air duct assembly according to claim 1, wherein
a boundary of a cross section, along an outlet direction, of the first diversion passage (106) and/or the second diversion passage (107) is a combination of one or more of an arc, a parabolic curve, a part of an elliptical curve and a hyperbolic curve with a straight line;

or wherein a boundary of a cross section, along an outlet direction, of the first diversion passage (106) and/or the second diversion passage (107) is a curve.
An air duct assembly, comprising:
a first housing (1), wherein an accommodation cavity (101) and a first opening (102) are formed in the first housing (1), and the accommodation cavity (101) communicates with the first opening (102);

a second housing (2), wherein the second housing (2) is nested in an outer side of the first housing (1), a second opening (201) and an air outlet (202) are formed in two axial ends of the second housing (2) respectively, and the second opening (201) and the first opening (102) have a same open end direction;

a third housing (3), wherein a first air inlet (301) is formed in the third housing (3), the third housing (3) covers the second opening (201), the third housing (3) extends at least partially into the accommodation cavity (101), wherein a second passage (103) is formed between an inner side of the first housing (1) and the third housing (3), wherein a third passage (104) is formed between the outer side of the first housing (1) and the second housing (2), wherein the second passage (103) communicates with the third passage (104) through the first opening (102) to draw air into the air duct assembly (100) from the first air inlet (301) and discharge the air from the air duct assembly (100) through the air outlet (202).
The air duct assembly according to claim 5, wherein
the first housing (1) and the second housing (2) are integrally formed;

and/or wherein the first housing (1) and the third housing (3) are integrally formed;

and/or wherein the second housing (2) and the third housing (3) are integrally formed.
The air duct assembly according to claim 5, wherein
one axial end, extending into the first housing (1), of the third housing (3) is spaced apart from the first housing (1) to form a first diversion passage (106), the third housing (3) is internally provided with a first passage (302) communicating with the first air inlet (301), and the first diversion passage (106) communicates with the first passage (302) and the second passage (103); and

wherein a second diversion passage (107) is formed between one end, provided with the first opening (102), of the first housing (1) and an other axial end of the third housing (3), and the second diversion passage (107) communicates the second passage (103) and the third passage (104).
The air duct assembly according to claim 5, wherein
the first housing (1) comprises a first housing body (11) and a blocking portion (12), the blocking portion (12) is arranged at one axial end of the first housing body (11), the accommodation cavity (101) is formed between the first housing body (11) and the blocking portion (12), the first opening (102) is formed in an other axial end of the first housing body (11), the third housing (3) extending into the accommodation cavity (101) through the first opening (102), the first housing (1) is provided with an inner surface and an outer surface which are arranged relatively inside and outside, the second passage (103) is formed between an inner surface of the first housing body (11) and the third housing (3), and the third passage (104) is formed between an outer surface of the first housing body (11) and the second housing (2); and/or

wherein the second housing (2) comprises a second housing body (21) and an air outlet portion (22), the air outlet portion (22) is arranged at one axial end of the second housing body (21), the air outlet (202) is formed in the air outlet portion (22), the second opening (201) is formed in an other axial end of the second housing body (21), the third housing (3) covers the second housing body (21), and the third passage (104) is formed between the outer side of the first housing (1) and an inner surface of the second housing body (21).
The air duct assembly according to claim 8, wherein the third housing (3) comprises a third housing body (31) and a radial extension portion (32), the radial extension portion (32) is arranged at one axial end of the third housing body (31) and is arranged convexly relative to a surface of the third housing body (31), the radial extension portion (32) is nested in the second housing (2) to block the second opening (201), the third housing body (31) forms the first passage (302) which is penetrated to form the first air inlet (301) in the one axial end of the third housing body (31), an other axial end of the third housing body (31) is nested and inserted in the accommodation cavity (101), and the second passage (103) is formed between the third housing body (31) and the inner side of the first housing (1).
The air duct assembly according to claim 9,
further comprising a seal ring (4), wherein the seal ring (4) is sleeved on the radial extension portion (32), the seal ring (4) is abutted between the radial extension portion (32) and the second housing (2) to seal a gap between the radial extension portion (32) and the second housing (2); and/or

wherein one of the radial extension portion (32) and the second housing (2) is provided with a limit rib (33), and an other of the radial extension portion (32) and the second housing (2) is provided with a limit slot (203), and the limit rib (33) is adapted with the limit slot (203); and/or

wherein the first passage (302) of the third housing body (31) is configured for installing a fan (400).
The air duct assembly according to claim 5, further comprising a heating assembly (5), wherein the heating assembly (5) is installed in the third passage (104).
The air duct assembly according to claim 11, further comprising a mounting bracket, wherein the mounting bracket is arranged on the first housing (1) or the second housing (2), the mounting bracket is located in the third passage (104), and the mounting bracket is configured for mounting the heating assembly (5).
The air duct assembly according to claim 12, wherein
the mounting bracket comprises a plurality of support members (6), the heating assembly (5) is arranged on the plurality of support members (6), the plurality of support members (6) are spaced apart along the outer surface of the first housing (1), the first housing (1) is provided with necks (105), each of the plurality of support member (6) is provided with a convex rib, and at least portion of the convex rib is located in a corresponding one of the necks (105); and/or

wherein the mounting bracket further comprises a heat insulation member (7), the heat insulation member (7) is nested in the second housing (2), and the heat insulation member (7) is located between the heating assembly (5) and the second housing (2).
A blowing device, comprising:
an outer housing (300), wherein a second air inlet (3001) and a mounting cavity are formed in the outer housing (300);

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 housing (300), the air duct assembly (100) is at least partially located in the mounting cavity; and

a fan (400), wherein the fan (400) is arranged on the third housing (3), the fan (400) is located in the first passage (302) of the third housing (3), and the fan (400) is configured to draw air into the outer housing (300) from the second air inlet (3001) and guide the air along the third housing (3) before being discharged through the air outlet (202).
An electric hair dryer, comprising:
a handle assembly (500); and

the blowing device according to claim 14, wherein the handle assembly (500) is arranged on the blowing device.
The electric hair dryer according to claim 15, wherein a hole (5001) is formed in the blowing device, wherein the hole (5001) is arranged adjacent to the heating assembly (5) of the blowing device, a third air inlet (5002) is formed in the handle assembly (500), and the third air inlet (5002) communicates with the hole (5001).