Air pipe fitting and blower

Abstract

The utility model relates to the technical field of air pipe type tools, and provides an air pipe fitting and a blower, which comprise a connecting pipe, a supporting layer and a tightening mechanism. One end of the connecting pipe is provided with a universal connector used for being connected with other air pipe type accessories, the connecting pipe comprises a tubular surface layer made of flexible materials, the supporting layers are made of elastic materials, and the supporting layers are intermittently distributed in the circumferential direction of the tubular surface layer and continuously distributed in the axial direction of the tubular surface layer; the tightening mechanism is installed at the end, away from the universal connector, of the connecting pipe, and the tightening mechanism is assembled to be capable of adjusting and limiting the caliber of the end, away from the universal connector, of the connecting pipe. The connecting pipe comprises a tubular surface layer made of a flexible material, a supporting layer and a tightening mechanism, and the connecting pipe can adapt to different air pipe tools by adjusting the caliber of a connector.

Description

Technical Field

[0001] This utility model relates to the field of duct tool technology, and in particular to a duct accessory and a hair dryer. Background Technology

[0002] When carrying out cleaning work, ducted tools such as hair dryers and vacuum cleaners are often used. These ducted tools usually require different air outlet components to be selected for different cleaning environments.

[0003] However, existing ductwork tools from different brands or models may have different interfaces. This necessitates the use of different air outlet components for each tool's specific interface. Because of these differences, users must purchase and store multiple models of air outlet components, increasing costs and space requirements. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to propose a duct accessory and a hair dryer to improve the versatility of the accessory.

[0005] To achieve the above and other related objectives, this utility model provides a duct fitting, comprising:

[0006] A connecting pipe, one end of which is provided with a universal interface for connecting other duct fittings, the connecting pipe including a tubular surface layer made of flexible material;

[0007] A support layer, made of an elastic material, is disposed along the wall of the tubular surface layer, is discontinuously distributed circumferentially along the tubular surface layer, and is continuously distributed axially along the tubular surface layer.

[0008] A tightening mechanism is installed at the end of the connecting tube away from the universal interface, and the tightening mechanism is configured to adjust and limit the diameter of the end of the connecting tube away from the universal interface.

[0009] In an optional embodiment of the present invention, the support layer includes a support portion, which is a liner plate that is bent circumferentially along the tubular surface layer, and the two ends of the bent liner plate are intermittently arranged.

[0010] In an optional embodiment of the present invention, the support layer includes a plurality of support portions, which are evenly spaced along the circumference of the tubular surface layer.

[0011] In an optional embodiment of this utility model, the support portion is a strip or a polygonal sheet.

[0012] In an optional embodiment of this invention, at least a portion of the support layer overlaps with the mounting area of ​​the universal interface and the tightening mechanism in the axial direction of the tubular surface layer.

[0013] In an optional embodiment of the present invention, the tubular surface layer includes an inner lining layer and a fabric layer, and the support layer is disposed between the inner lining layer and the fabric layer.

[0014] In an optional embodiment of this utility model, the tightening mechanism includes a buckle and a locking strap, one end of the locking strap is connected to the buckle, and the buckle is configured to fix or release the strap body of the locking strap.

[0015] In an optional embodiment of this utility model, the inner diameter of the connecting tube gradually decreases from the end where the tightening mechanism is located to the end where the universal interface is located.

[0016] This utility model also provides a hair dryer, comprising:

[0017] The main body, including the air outlet;

[0018] Air outlet components;

[0019] A connecting pipe, one end of which is provided with a universal interface for connecting the air outlet assembly, the connecting pipe comprising a tubular surface layer made of a flexible material;

[0020] A support layer, made of an elastic material, is disposed along the wall of the tubular surface layer, is discontinuously distributed circumferentially along the tubular surface layer, and is continuously distributed axially along the tubular surface layer.

[0021] A tightening mechanism is installed at the end of the connecting pipe away from the universal interface. The tightening mechanism is configured to adjust and limit the diameter of the end of the connecting pipe away from the universal interface to tighten it at the air outlet end.

[0022] In an optional embodiment of this utility model, the air outlet assembly includes an adapter pipe, one end of which is provided with a first type of interface for connecting to the universal interface, and the other end of the adapter pipe away from the first type of interface is provided with a second type of interface.

[0023] In an optional embodiment of this utility model, an annular groove is provided on the outer periphery of the first type of interface.

[0024] In an optional embodiment of this utility model, the air outlet assembly includes an air outlet pipe, and a second type interface and a third type interface are respectively provided at both ends of the air outlet pipe. The third type interface is assembled to be able to connect with the second type interface on another accessory.

[0025] In an optional embodiment of this utility model, the second type of interface and the third type of interface are threaded interfaces that can be threadedly engaged with each other.

[0026] In an optional embodiment of this utility model, the air outlet assembly includes a blower pipe, with an air outlet and a third type interface respectively provided at both ends of the blower pipe, and the angle between the third type interface at one end of the blower pipe and the axial direction of the air outlet is 0-90°.

[0027] In an optional embodiment of this utility model, the angle between the third type interface at one end of the blower tube and the axial direction of the air outlet is an acute angle.

[0028] This utility model proposes a duct accessory and a hair dryer. The accessory features a connecting tube design, comprising a tubular surface layer made of flexible material, a support layer, and a tightening mechanism. The connecting tube can be adjusted to accommodate different duct tools by changing the diameter of the interface. This design achieves greater compatibility between different duct tools, effectively solving the interface incompatibility problem in existing technologies and providing a more flexible, economical, and efficient user experience. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the connecting pipe structure of the duct fitting in one embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram showing the positions of the tubular surface layer and the support layer of the duct fitting in one embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the adapter pipe structure of the air outlet component in one embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the air outlet pipe structure of the air outlet component in one embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the air outlet assembly's blower pipe structure in one embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the air outlet component structure in one embodiment of the present invention;

[0036] Figure 7This is a schematic diagram showing the connection between the air outlet component and a hair dryer body in one embodiment of the present invention.

[0037] Figure 8 This is a schematic diagram showing the connection between the air outlet component and another hair dryer body in one embodiment of the present invention.

[0038] Figure 9 This is a disassembly diagram of the hair dryer in one embodiment of the present invention.

[0039] Explanation of reference numerals in the attached drawings: 10. Body; 20. Connecting pipe; 21. General interface; 22. Tubular surface layer; 23. Support layer; 30. Tightening mechanism; 31. Locking buckle; 32. Locking strap; 40. Adaptor pipe; 50. Air outlet pipe; 60. Air blower pipe; 71. Type I interface; 72. Type II interface; 73. Type III interface. Detailed Implementation

[0040] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0041] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] In cleaning, the use of ducted tools (such as hair dryers and vacuum cleaners) is common practice, especially when cleaning large areas or hard-to-reach places. These tools are usually equipped with different air outlet components that can be adjusted according to actual needs. However, the interfaces of existing ducted tools may differ, and the interface standards between different brands or models are not standardized, resulting in the need to customize air outlet components with different interfaces for each tool. While this approach can solve the problem of interface incompatibility, it also has some obvious drawbacks.

[0043] Because different brands or models of duct tools use different interfaces, users may need to purchase specially matched air outlet components for each tool. This not only increases the initial purchase cost of the equipment but may also lead to additional expenses for purchasing accessories with different interfaces during long-term maintenance.

[0044] If a user has multiple ductwork tools, they may need to purchase a separate air outlet assembly for each tool due to the different interfaces. This limits the user's choices when purchasing and prevents the sharing of accessories, further increasing the purchase cost.

[0045] Because different tools use different duct interfaces, users must store multiple models of air outlet components, which can be a problem for homes or factories with limited space. Air outlet components with different interfaces may need to be stored separately to avoid confusion or damage. This diverse requirement for accessory storage can lead to unnecessary space waste.

[0046] like Figure 1 , 2 As shown, in order to achieve the above-mentioned and other related objectives, this utility model provides a duct fitting, which is assembled on a duct tool, specifically a hair dryer. The duct fitting includes a connecting pipe 20, a support layer 23, and a tightening mechanism 30.

[0047] The inner diameter of the connecting tube 20 gradually decreases from the end where the tightening mechanism 30 is located to the end where the universal interface 21 is located. That is, the inner diameter of the connecting tube 20 gradually decreases along the blowing direction. The design of the larger end of the connecting tube 20 facilitates easy fitting onto hair dryers of various sizes, ensuring compatibility with multiple types and models of equipment. Since hair dryer interfaces vary in size, traditional air outlet components often require selection based on specific models, while the gradually decreasing inner diameter design provides greater adaptability. Users do not need to equip each hair dryer model with a separate air outlet component, greatly improving ease of use and flexibility. The design of the connecting tube 20 with a gradually decreasing inner diameter from the larger end to the smaller end is intended to gradually converge the airflow during hair dryer operation, thereby increasing wind speed and airflow concentration. Generally, the smaller diameter makes it easier to converge the airflow, thus concentrating the airflow and improving the efficiency and wind power of the hair dryer, especially advantageous for fine blowing and directional airflow operations.

[0048] One end of the connecting pipe 20 is provided with a universal interface 21 for connecting to the first end of other ductwork accessories. These other ductwork accessories refer to the tubular fittings for air outlets or inlets of ductwork tools, specifically the outlet pipe of a hair dryer and the outlet assembly of the hair dryer in this application. The connecting pipe 20 includes a tubular surface layer 22 made of a flexible material, specifically fabric, which can cover the entire connecting pipe 20. Flexible materials, especially fabric, can adapt to different types of interfaces. Their soft and stretchable properties allow the pipe to connect to interfaces of various sizes and shapes. Whether the interface is round, elliptical, or irregularly shaped, the flexible material can achieve a tight connection through simple tightening and adjustment.

[0049] A support layer 23, made of an elastic material (such as plastic), is disposed along the wall of the tubular surface layer 22. Flexible materials are inherently prone to bending and deformation, but the addition of the support layer 23 effectively improves the structural rigidity of the pipe, ensuring that the pipe maintains its original shape and stability during operation. Without the support layer 23, the flexible tubular surface layer 22 might twist or warp under external force during pipe connection. The support layer 23 ensures that the pipe does not undergo unnecessary twisting or turning during connection, thus guaranteeing the overall stability and correct installation of the pipe. Especially when the duct or pipe needs to withstand certain external impacts or tensions, the support layer 23 effectively prevents loose joints or other problems caused by pipe twisting.

[0050] The support layer 23 is discontinuously distributed circumferentially along the tubular surface layer 22. Because the support layer 23 is discontinuously arranged circumferentially, these interval areas are not restricted by the support layer 23, and space can be reserved for pipe contraction or extension. In this way, the pipe can flexibly contract or extend in these areas when its shape needs to be adjusted.

[0051] The support layer 23 is continuously distributed along the axial direction of the tubular surface layer 22. This continuous axial distribution of the support layer 23 ensures the stability and structural strength of the pipe along its length. At least a portion of the support layer 23 overlaps with the mounting areas of the universal interface 21 and the tightening mechanism 30 along the axial direction of the tubular surface layer 22. The mounting areas of the universal interface 21 and the tightening mechanism 30 are critical locations for connecting other parts; the overlap of the support layer 23 with the mounting area of ​​the universal interface 21 provides additional support at these locations, thereby enhancing the connection strength.

[0052] In an optional embodiment of this invention, the support layer 23 includes a support portion, which is a circumferentially bent liner of the tubular surface layer 22, with the bent liner intermittently arranged at both ends. The liner can be a single piece of plastic sheet, which can be rolled up and inserted into the tubular surface layer 22 to maintain its shape. The bent liner is arranged circumferentially along the tubular surface layer 22, forming a ring-shaped support structure. The intermittent arrangement at both ends of the bent liner means that the liner is not a continuous ring, but has intervals in the circumferential direction, possibly placed in specific areas of the tubular surface layer 22 to enhance the local strength of the tubular surface layer 22. The bent design can enhance the fit between the liner and the tubular surface layer 22, making it fit more tightly to the shape of the tubular surface layer 22 and providing higher load-bearing capacity.

[0053] like Figure 2As shown, the support layer 23 includes multiple support sections, which are evenly spaced along the circumference of the tubular surface layer 22. When the support sections of the pipe are independently separated along the circumference of the tubular surface layer 22, each support section becomes an independent module that can be manufactured and processed separately. The independent support sections can be easily and quickly assembled on-site. Because the support sections are designed as independent components, construction personnel can precisely install each support section as needed without requiring extensive adjustments during complex layout processes.

[0054] In an optional embodiment of this invention, the support portion is elongated or polygonal. Different support portion structures can be selected based on the shape of the tubular surface layer 22. For example, a rectangular or elongated structure can be selected for a circular tubular surface layer 22, while a triangular or trapezoidal structure can be selected for a conical tubular surface layer 22. Rectangular sheet-shaped support portions can form good contact with the outer surface of the circular pipe, simplifying the installation process. Triangular or trapezoidal support portions are particularly suitable for contact with conical pipes, as they can precisely adapt to the gradual change in shape of the pipe, ensuring a tight fit and avoiding uneven stress.

[0055] like Figure 2 As shown, the tubular surface layer 22 includes an inner lining layer and a fabric layer, with the support layer 23 disposed between the inner lining layer and the fabric layer. A storage area can be formed by sewing the inner lining layer and the fabric layer together, and the support layer 23 can be directly inserted into this storage area without the need for complex external supports or fixing devices. Because the support layer 23 is fixed within a specific area, its position is stable, avoiding unnecessary adjustments or repositioning.

[0056] like Figure 1 As shown, a tightening mechanism 30 is installed at the end of the connecting pipe 20 furthest from the air outlet assembly. The tightening mechanism 30 can be a binding rope, elastic rope, or other similar structure. The tightening mechanism 30 is configured to adjust and limit the diameter of the end of the connecting pipe 20 furthest from the air outlet assembly. When the tightening mechanism 30 (such as a binding rope or elastic rope) tightens the pipe interface, it effectively prevents loosening or misalignment at the interface of the connecting pipe 20, ensuring tight contact between the connecting pipe 20 and the blower or other components. The tightening mechanism 30 can adapt to interfaces of different sizes and shapes. By adjusting its tightening degree, the tightening mechanism 30 ensures that the interface diameter can expand or contract as needed to achieve a perfect match. For some irregularly designed pipe interfaces, the tightening mechanism 30 can adapt to changes in the shape of the interface through structural flexibility and elasticity, thereby ensuring a secure connection.

[0057] Specifically, such as Figure 1As shown, the tightening mechanism 30 includes a buckle 31 and a locking strap 32. One end of the locking strap 32 is connected to the buckle 31, and the buckle 31 is configured to fix or release the strap body of the locking strap 32. In use, the locking strap 32 is inserted into the buckle 31 to form a loop, then the locking strap 32 is pulled until it is tightened onto the installed interface, and then the buckle 31 is used to lock the strap body to maintain its fixation. The tightening mechanism 30 using the locking strap 32 and buckle 31 is very simple, allowing users to complete installation and adjustment in a short time. Through the simple steps of insertion, tightening, and locking, a stable connection of the pipe interface can be quickly achieved. The buckle 31 can be a snap-fit ​​type, containing a slot or groove with a resilient latch. When the end of the locking strap 32 is inserted into the snap-fit, the latch automatically engages the locking strap 32 to prevent slippage. By pressing or pulling the latch, the buckle can be released, thereby loosening the locking strap 32.

[0058] like Figure 7 , 8 As shown in Figures 1 and 9, this utility model provides a hair dryer, including a body 10, an air outlet assembly, a connecting pipe 20, a support layer 23, and a tightening mechanism 30.

[0059] The main body 10 includes an air outlet end, and the main body 10 is the part of the hair dryer that performs the work.

[0060] One end of the connecting pipe 20 is provided with a universal interface 21 for connecting the air outlet assembly, and the connecting pipe 20 includes a tubular surface layer 22 made of flexible material;

[0061] The support layer 23 is disposed along the wall of the tubular surface layer 22. The support layer 23 is made of elastic material. The support layer 23 is discontinuously distributed circumferentially along the tubular surface layer 22 and continuously distributed axially along the tubular surface layer 22.

[0062] A tightening mechanism 30 is installed at the end of the connecting pipe 20 away from the universal interface. The tightening mechanism 30 is configured to adjust and limit the diameter of the end of the connecting pipe 20 away from the universal interface to tighten it at the air outlet end.

[0063] like Figure 3As shown, the air outlet assembly includes an adapter pipe 40. One end of the adapter pipe 40 is provided with a first type interface 71 for connection to a universal interface. This universal interface has a certain degree of flexibility and adjustability to adapt to different installation requirements. The end of the adapter pipe 40 away from the first type interface 71 is provided with a second type interface 72. This dual-end interface design provides broader compatibility and solves the problem of interface type mismatch in existing duct systems. Users only need to select the appropriate adapter pipe 40 according to the required air outlet assembly and install it in the duct system. By connecting with other air outlet assemblies through the interface of the adapter pipe 40, connections between different types of ducts can be achieved without modifying the original duct system.

[0064] like Figure 3 As shown, the first type of interface 71 has an annular groove on its outer periphery. A flange can be sewn onto the end of the tubular fabric surface layer 22, and a cable tie can be inserted into an opening in the flange. The end is then fitted onto the first type of interface 71 and the cable tie is tightened, embedding the cable tie into the annular groove. The annular groove provides a fixing point where the cable tie can be secured, avoiding the risk of unstable connection due to cable tie loosening or slippage in traditional methods. After the cable tie is embedded in the annular groove, the tightness of the connection is greatly improved, making it less susceptible to external forces and ensuring that the duct will not easily detach during long-term use.

[0065] like Figure 4 As shown, the air outlet assembly includes an air outlet duct 50, with a second type interface 72 and a third type interface 73 respectively provided at both ends of the air outlet duct 50. The third type interface 73 is assembled to connect with the second type interface 72 on another accessory. Existing air outlet assemblies may be too short to clean areas such as roofs. Multiple air outlet ducts 50 can be interconnected to extend the length of the air outlet assembly, allowing the duct system to cover a greater distance and meet the cleaning needs of higher areas such as roofs.

[0066] like Figure 4 As shown, the second type of interface 72 and the third type of interface 73 are threaded interfaces that can be threaded together. The threaded interface design makes the installation process simpler and more convenient. Users only need to align the two interfaces and then rotate them clockwise to connect them to easily complete the installation. In addition, the threaded connection is also very easy to disassemble; it can be easily separated by simply rotating it counterclockwise.

[0067] like Figure 5As shown, the air outlet assembly includes a blower duct 60, with an air outlet and a third-type interface 73 at each end. The angle α between the third-type interface 73 at one end of the blower duct 60 and the axial direction of the air outlet is 0-90°. When the angle α between the third-type interface 73 at one end of the blower duct 60 and the axial direction of the air outlet is 0°, the air outlet is bent towards the user, making it easier to clean areas away from the user (such as corners, the back of equipment, and other hard-to-reach areas). When the angle α between the third-type interface 73 at one end of the blower duct 60 and the air outlet is 90°, the airflow can be sprayed upwards or outwards at a right angle, effectively cleaning hard-to-reach high areas such as platforms, stairwell ceilings, and overhead pipes. The cleaning effect of the air outlet assembly is particularly significant at this angle, quickly covering these high or crevice areas and avoiding dead corners that are inaccessible by traditional cleaning methods.

[0068] like Figure 5 As shown, the angle α between the third type interface 73 at one end of the air duct 60 and the axial direction of the air outlet is an acute angle. The fine-tuning capability of the acute angle structure allows the air outlet assembly to effectively address the cleaning needs of different spaces. For example, the angle of the air outlet assembly can be adjusted to clean areas behind the user, corners, platform gaps, etc. This flexibility makes the system more adaptable and enables precise cleaning results in various environments. The acute angle design allows users to achieve optimal cleaning results by fine-tuning the angle of the air duct without making significant adjustments. This design reduces the complexity of user operations and improves the efficiency of cleaning work. For example, when cleaning areas at different heights or inaccessible areas, users can easily adjust the angle of the air duct to achieve the ideal airflow direction, thereby reducing unnecessary operations.

[0069] In summary, this utility model proposes a duct accessory and a blower. The utility model features a connecting pipe 20 design, which includes a tubular surface layer 22 made of flexible material, a support layer 23, and a tightening mechanism 30. The connecting pipe 20 can adapt to different duct tools by adjusting the diameter of the interface. This achieves higher compatibility between different duct tools, effectively solving the interface incompatibility problem in existing technologies, and bringing a more flexible, economical, and efficient user experience. The connecting pipe 20 design effectively solves the problem of interface mismatch between different duct tools. Because the diameter of the air outlet component's interface can be adjusted by the tightening mechanism 30 to match the interfaces of various duct tools, compatibility is achieved. This means that users do not need to purchase special accessories or conversion components for each tool; they can use a unified interface air outlet component to switch between different brands and models of tools. In existing technologies, because different brands and models of tools use different interfaces, users may need to select different air outlet components depending on the specific tool. The emergence of the connecting pipe 20 reduces the types of interfaces, making the use of duct tools simpler and reducing reliance on specific accessories. Traditional duct tools typically require the purchase of specialized accessories for different models and brands. However, the Connector 20 design allows users to purchase only one type of duct accessory, compatible with multiple tools. This not only saves on the cost of purchasing different accessories but also reduces maintenance and replacement costs for users. The standardized interface design reduces the variety of accessories required for duct tool repairs. Repair personnel can quickly identify and replace accessories using the Connector 20 design without having to consider multiple incompatible interfaces. This improves repair efficiency and reduces delays caused by incompatible accessories.

[0070] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0071] Although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various alterations and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Therefore, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A duct fitting, characterized in that, include: A connecting pipe, one end of which is provided with a universal interface for connecting other duct fittings, the connecting pipe including a tubular surface layer made of flexible material; A support layer, made of an elastic material, is disposed along the wall of the tubular surface layer, is discontinuously distributed circumferentially along the tubular surface layer, and is continuously distributed axially along the tubular surface layer. A tightening mechanism is installed at the end of the connecting tube away from the universal interface, and the tightening mechanism is configured to adjust and limit the diameter of the end of the connecting tube away from the universal interface.

2. A duct fitting according to claim 1, characterized in that, The support layer includes a support portion, which is a liner plate that is bent circumferentially along the tubular surface layer, with the two ends of the bent liner plate being intermittently arranged.

3. A duct fitting according to claim 1, characterized in that, The support layer includes multiple support portions, which are evenly spaced along the circumference of the tubular surface layer.

4. A duct fitting according to claim 3, characterized in that, The support portion is in the form of a long strip or a polygonal sheet.

5. A duct fitting according to claim 1, characterized in that, At least a portion of the support layer overlaps with the mounting areas of the universal interface and the tightening mechanism in the axial direction of the tubular surface layer.

6. A duct fitting according to claim 1, characterized in that, The tubular surface layer includes an inner lining layer and a fabric layer, and the support layer is disposed between the inner lining layer and the fabric layer.

7. A duct fitting according to claim 1, characterized in that, The tightening mechanism includes a buckle and a locking strap, one end of which is connected to the buckle, and the buckle is configured to secure or release the strap body of the locking strap.

8. A duct fitting according to claim 1, characterized in that, The inner diameter of the connecting tube gradually decreases from the end where the tightening mechanism is located to the end where the universal interface is located.

9. A hair dryer, characterized in that, include: The main body, including the air outlet; Air outlet components; A connecting pipe, one end of which is provided with a universal interface for connecting the air outlet assembly, the connecting pipe comprising a tubular surface layer made of a flexible material; A support layer, made of an elastic material, is disposed along the wall of the tubular surface layer, is discontinuously distributed circumferentially along the tubular surface layer, and is continuously distributed axially along the tubular surface layer. A tightening mechanism is installed at the end of the connecting pipe away from the universal interface. The tightening mechanism is configured to adjust and limit the diameter of the end of the connecting pipe away from the universal interface to tighten it at the air outlet end.

10. A hair dryer according to claim 9, characterized in that, The air outlet assembly includes an adapter pipe, one end of which is provided with a first type of interface for connecting to the general interface, and the other end of the adapter pipe away from the first type of interface is provided with a second type of interface.

11. A hair dryer according to claim 10, characterized in that, The first type of interface has an annular groove on its outer periphery.

12. A hair dryer according to claim 9, characterized in that, The air outlet assembly includes an air outlet duct, with a second type of interface and a third type of interface respectively provided at both ends of the air outlet duct. The third type of interface is assembled to be able to connect to the second type of interface on another accessory.

13. A hair dryer according to claim 12, characterized in that, The second type of interface and the third type of interface are threaded interfaces that can be threaded together.

14. A hair dryer according to claim 9, characterized in that, The air outlet assembly includes a blower pipe, with an air outlet and a third type interface respectively provided at both ends of the blower pipe. The angle between the third type interface at one end of the blower pipe and the axial direction of the air outlet is 0-90°.

15. A hair dryer according to claim 14, characterized in that, The angle between the third type of interface at one end of the blower tube and the axial direction of the air outlet is an acute angle.

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