An air duct system for use with a straightening device

Abstract

The utility model relates to a straightening device technical field especially is applied to a wind channel system of straightening device, including main part, the inside of main part has main flow channel and is connected with two branch flow channels of main flow channel, main part has two interval cooperation's straightening wall, and the straightening space for blowing straight or drying hair is formed between two straightening walls, and the inside of main part is provided with main flow channel and two branch flow channels connected with main flow channel, and two branch flow channels set up along two straightening wall length direction, and a plurality of oblique air outlets are set up on the straightening wall along its length direction, and the straightening space is communicated with branch flow channel through oblique air outlet, gradually reduce through branch flow channel cross section area gradually reduces and combines the design of wavy structure size decrement, can gather heat in wavy structure and make greater extent be guided flow oblique air outlet, effectively overcome the uneven hot air distribution difficult problem of traditional air channel, guarantee hot air even from each oblique air outlet blows out.

Description

Technical Field

[0001] This utility model relates to the field of hair straightening device technology, and in particular to an air duct system applied to hair straightening devices. Background Technology

[0002] In the hair styling industry, hair straighteners are commonly used tools that straighten hair by heating it at high temperatures. However, the high-temperature heating process can easily cause irreversible damage to the hair, such as denaturation of hair proteins and loss of moisture, leading to dryness, split ends, and seriously affecting hair health.

[0003] To address the aforementioned issues, the prior art proposes a hair straightening device as described in the utility model patent authorization announcement number CN222787217U. This device features a guiding slope within its working channel. When the airflow within the working chamber exits through the inclined air outlet, the airflow is guided by the guiding slope within the working channel, concentrating the utilization of airflow speed and heat to achieve efficient drying and straightening of the hair, thereby reducing direct damage to the hair from high temperatures to a certain extent.

[0004] However, in actual use of hair straighteners with this structure, it was found that the design, which uses multiple guide plates to create multiple angled air outlets, has significant flaws. Specifically, the working chamber cannot evenly distribute hot air to each angled air outlet, causing more hot air to be blown too concentratedly towards the angled air outlet near the front of the working chamber. This results in uneven distribution of hot air throughout the working channel, greatly reducing the drying and straightening effect on the hair and failing to meet users' dual needs for ideal straightening results and hair care. Therefore, it is necessary to propose an improved technical solution to address these problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] A duct system for a hair straightener includes a main body. The main body has a main flow channel and two branch flow channels connected to the main flow channel. The main body has two spaced straightening walls, forming a straightening space for straightening or drying hair. The main flow channel and the two branch flow channels are arranged along the length of the two straightening walls. Long, oblique air outlets are formed along the length of each straightening wall. The straightening space and the branch flow channels are connected through these oblique air outlets. The air intake body is connected to the main flow channel, so that the body can form a directional fluid that enters from the air intake, passes through the main flow channel and the branch flow channel, and is then blown into the straight space from the oblique air outlet. The wall surface of the straight wall corresponding to the branch flow channel is formed with a wave-shaped structure corresponding to the oblique air outlet. The wave-shaped structure and the oblique air outlet are in an arc transition structure. The cross-sectional area of ​​the branch flow channel gradually decreases from one end connected to the main flow channel to its end. The longitudinal dimension of the wave-shaped structure gradually decreases as the cross-sectional area of ​​the branch flow channel gradually decreases.

[0007] Compared with the prior art, the beneficial effects of this utility model are:

[0008] By gradually reducing the cross-sectional area of ​​the branch channels and combining it with the decreasing size of the wave-shaped structure, heat can be concentrated in the wave-shaped structure and guided to a greater extent towards the oblique air outlets. This effectively overcomes the problem of uneven hot air distribution in traditional air ducts, ensuring that hot air is blown out evenly from each oblique air outlet. Furthermore, the wave-shaped structure allows heat to be deposited on the concave side of the wave-shaped structure as it passes through, thereby increasing the heat accumulation on the air outlet side of the branch channels to a certain extent. This indirectly affects the hair in the straightening space, resulting in better hair drying, improved efficiency, and better hair care to a certain extent. It balances hair styling effect and hair health, bringing users a better straight hair styling experience.

[0009] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0011] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0012] Figure 2This is a schematic diagram of the longitudinal cross-section of Embodiment 1 of this utility model;

[0013] Figure 3 This is a utility model Figure 2 Schematic diagram of the structure at point A;

[0014] Figure 4 This is a three-dimensional structural diagram of the longitudinal section of Embodiment 1 of this utility model;

[0015] Figure 5 This is a utility model Figure 4 Schematic diagram of the structure at point B;

[0016] Figure 6 This is a schematic diagram of the planar structure of Embodiment 1 of this utility model in the transverse section;

[0017] Figure 7 This is a three-dimensional structural diagram of the transverse cross-section of Embodiment 1 of this utility model;

[0018] Figure 8 These are schematic diagrams illustrating two implementation methods of the two sets of wave-like structures in Embodiment 1 of this utility model.

[0019] Figure 9 This is an illustration of the fluid flow effect in Embodiment 1 of this utility model;

[0020] Figure 10 This is a diagram illustrating the effect of guiding fluid flow through the arc-shaped lifting structure in Embodiment 1 of this utility model.

[0021] Figure 11 This is another effect diagram of fluid flow in Embodiment 1 of this utility model;

[0022] Figure 12 This is a schematic diagram of the longitudinal cross-sectional structure of Embodiment 2 of this utility model;

[0023] Figure 13 This is a utility model Figure 12 Schematic diagram of the structure at point C;

[0024] Figure 14 This is a schematic diagram of the transverse cross-sectional structure of Embodiment 2 of this utility model;

[0025] Figure 15 This is a partial cross-sectional structural diagram of Embodiment 2 of this utility model;

[0026] Figure 16 This is a utility model Figure 15 Schematic diagram of the structure at point D;

[0027] Figure 17 This is a partial cross-sectional structural diagram of Embodiment 3 of this utility model;

[0028] Figure 18 This is a utility model Figure 17 A schematic diagram of the structure at point E in the middle.

[0029] The reference numerals and names in the figure are as follows:

[0030] Main body 10, main flow channel 11, branch flow channel 12, air inlet 13, diversion structure 14, straight hair wall 20, straight hair space 21, oblique air outlet 22, oblique air hole 220, transition section 221, inclined section 222, wave-shaped structure 23, protrusion 231, recess 232, first partition 24, second partition 25, expansion section 251, sheet-like section 252, arc-shaped plate 26. Detailed Implementation

[0031] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0033] Please see Figure 1-10In this embodiment of the present invention, an air duct system for a hair straightening device includes a main body 10. The main body 10 has two hair straightening walls 20 spaced apart, forming a hair straightening space 21 for straightening or drying hair between the two hair straightening walls 20. A main flow channel 11 and two branch flow channels 12 connected to the main flow channel 11 are provided inside the main body 10, and the two branch flow channels 12 are arranged along the length of the two hair straightening walls 20. An elongated oblique air outlet 22 is provided on the hair straightening wall 20 along its length. The hair straightening space 21 and the branch flow channels 12 are connected through the oblique air outlet 22. An air inlet body 10 is provided with... The main body 10 has an air inlet 13 connected to the main channel 11, which enables the main body 10 to form a directional fluid that enters from the air inlet 13, passes through the main channel 11 and the branch channel 12, and is then blown from the oblique air outlet 22 to the straight space 21. The straight wall 20 has a wave-shaped structure 23 corresponding to the oblique air outlet 22 formed on the wall surface of the side corresponding to the branch channel 12. The wave-shaped structure 23 and the oblique air outlet 22 have an arc transition structure. The cross-sectional area of ​​the branch channel 12 gradually decreases from one end connected to the main channel 11 to its end. The longitudinal dimension of the wave-shaped structure 23 gradually decreases as the cross-sectional area of ​​the branch channel 12 gradually decreases.

[0034] In the air duct system of this hair straightener, the air inlet 13 of the main body 10 is connected to the air supply device to obtain hot air. The hot air flows sequentially through the main channel 11 and is split into two branch channels 12 extending along the length of the hair straightener wall 20. The branch channels 12 are designed with a cross-sectional area that gradually decreases from the connection with the main channel 11 to the front end, which causes the hot air velocity to continuously increase during the flow process and the pressure distribution to be more uniform. After the hot air enters the branch channels 12, it is blown at an inclined angle into the hair straightening space 2 through the inclined air outlet 22 set along the length of the hair straightener wall 20. 1. This design allows the hair placed in the straightening space 21 to be blown out to one side. At the same time, the wave-shaped structure 23 of the straightening wall 20 corresponding to the side wall of the branch channel 12 forms an arc transition with the oblique air outlet 22, which can effectively guide the fluid flowing along the length direction in the branch channel 12, so that it can smoothly change its flow direction and accurately face the oblique air outlet 22. This design makes full use of the Coanda effect, allowing the fluid to flow in accordance with the wall under the action of the arc surface, avoiding turbulence or wind resistance caused by sudden changes in flow direction, and ensuring that the hot air is blown out from the oblique air outlet 22 in a stable and uniform state. The wave-shaped structure 23 cleverly utilizes the Coanda effect to guide the direction of airflow, and the size of the wave-shaped structure 23 matches the decreasing trend of the cross-sectional area of ​​the branch channel 12. Specifically, the branch channel 12 has an air outlet surface that serves as the wall surface of the straight hair wall 20, two upper and lower side surfaces that connect with the air outlet surface, an opposite surface relative to the air outlet surface, and an end surface located at the end of the branch channel 12. The two side surfaces of the branch channel 12 are arranged to gradually converge towards the middle from one end connected to the main channel 11 to the front end of the branch channel 12, so that the length of the wave-shaped structure 23 gradually decreases as the cross-sectional area of ​​the branch channel 12 gradually decreases. This design makes the wave-shaped structure 23 near the main channel 11 have a stronger airflow guiding effect, effectively avoiding insufficient airflow at the oblique air outlet 22, and realizing that hot air flows smoothly and evenly through the oblique air outlet 22 to the straight hair space 21 for drying and straightening the hair.

[0035] Therefore, on the one hand, the synergistic design of the gradually changing cross-sectional area of ​​the branch channel 12 and the decreasing size of the wave-shaped structure 23 effectively solves the problem of hot air concentrating at the front air outlet in the traditional structure, allowing the hot air to be indirectly and evenly distributed throughout the straightening space 21, greatly improving the drying and straightening effect, ensuring that all parts of the hair are subjected to force and heat evenly, and meeting the user's demand for the ideal straight hair effect; on the other hand, the arc transition and heat deposition effect of the wave-shaped structure 23 and the oblique air outlet 22 reduce the direct damage of high temperature to the hair, and combined with the even distribution of hot air, it can take care of hair care while styling, achieving the dual effect of hair styling and hair care, and improving the user experience.

[0036] To further illustrate the function of this technical solution, three embodiments will be provided below:

[0037]

Example 1

[0038] Please see Figure 1-11 In this embodiment, the wave-shaped structure 23 has multiple elongated and staggered protrusions 231 and recesses 232, with an arc transition between adjacent protrusions 231 and recesses 232. This structural design allows the airflow to smoothly transition along the arc surface when flowing within the branch channel 12, reducing airflow resistance and preventing the formation of vortices at turning points, thereby ensuring smooth airflow and further improving the uniformity of hot air within the branch channel 12.

[0039] Furthermore, the wave-shaped structure 23 has two sets, which are respectively distributed between the inclined air outlet 22 and the upper side of the branch channel 12 and between the inclined air outlet 22 and the lower side of the branch channel 12. For example, Figure 8 a. The protrusions 231 of the two sets of wavy structures 23 are connected to each other, and the recesses 232 of the two sets of wavy structures 23 are connected to each other; or, as... Figure 8 b. The protrusions 231 of the two sets of wave-shaped structures 23 are staggered, and the recesses 232 of the two sets of wave-shaped structures 23 are staggered. When the protrusions 231 are connected to each other and the recesses 232 are connected to each other, a continuous guiding path can be formed, which enhances the guiding effect on the airflow and makes the airflow more concentrated towards the oblique air outlet 22. When the protrusions 231 and the recesses 232 are staggered, the airflow trajectory can be further disrupted, allowing the airflow to mix fully in the branch channel 12, so that it is blown out more evenly from the oblique air outlet 22, improving the effect on the hair.

[0040] Furthermore, the angled air outlet 22 is located in the middle, lower, or upper part of the straightener wall 20. This flexible arrangement can adapt to the styling needs of different hair lengths and sections. Whether the user is working on the top, middle, or ends of the hair, the hot air can be precisely applied to the target area, improving the applicability of the straightener.

[0041] Furthermore, at least one side of the branch channel 12 is arranged to gradually converge towards the oblique air outlet 22 from one end connected to the main channel 11 to the end face of the branch channel 12, so that the length of the protrusion 231 and the recess 232 gradually decreases as the cross-sectional area of ​​the branch channel 12 gradually decreases. This design matches the overall trend of the gradually decreasing cross-sectional area of ​​the branch channel 12, ensuring that the wave-shaped structure 23 can adapt to the airflow state at various positions of the branch channel 12, continuously guiding the airflow, ensuring uniform distribution of hot air, and avoiding situations where the local hot air is too strong or too weak.

[0042] Furthermore, the oblique air outlet 22 has a transition section 221 that is normally connected to the branch channel 12 and an oblique section 222 that is obliquely connected to the straightening space 21, and the angle between the oblique section 222 and the wall surface of the straightening wall 20 is 20°-60°. The setting of the transition section 221 allows the airflow to smoothly enter the oblique air outlet 22 from the branch channel 12, reducing airflow loss; while the 20°-60° angle design can ensure that the hot air blows onto the hair in the straightening space 21 at a suitable angle, enhancing the straightening effect on the hair, and can also avoid the hot air being dispersed due to the angle being too large or the hair being over-impacted due to the angle being too small, thus improving the styling effect while taking into account hair care.

[0043] Furthermore, the oblique air outlet 22 has multiple oblique air holes 220; wherein, between two adjacent oblique air holes 220, there is a first dividing portion 24, which is part of a wave-shaped structure 23, so that the wave-shaped structure 23 and the corresponding oblique air hole 220 form an arc-shaped transition structure. The first dividing portion 24 not only serves to separate the oblique air holes 220, but also, as part of the wave-shaped structure 23, it can further guide the airflow to be blown out evenly from each oblique air hole 220, avoiding hot air from being too concentrated at the oblique air outlet 22. At the same time, the arc-shaped transition structure further reduces airflow resistance and ensures smooth airflow output.

[0044] Furthermore, a flow-dividing structure 14 is provided between the main flow channel 11 and the two branch flow channels 12, and the flow-dividing structure 14 and the first wave-shaped structure 23 of the branch flow channel 12 form an arc transition structure. The flow-dividing structure 14 can evenly distribute the airflow in the main flow channel 11 to the two branch flow channels 12, while the arc transition structure ensures a smooth transition when the airflow enters the branch flow channel 12 from the main flow channel 11, avoiding turbulence at the diversion point, ensuring the uniformity of airflow in the initial section of the branch flow channel 12, and laying a good foundation for the uniform distribution of hot air throughout the entire branch flow channel 12.

[0045]

Example 2

[0046] Please see Figure 12-16 In this embodiment, the wave-shaped structure 23 has multiple long, staggered protrusions 231 and recesses 232, with an arc transition between adjacent protrusions 231 and recesses 232. This structure allows the airflow to flow smoothly along the arc within the branch channel 12, reducing resistance and turbulence caused by airflow impact, and guiding the airflow more smoothly to the oblique outlet 22, laying the foundation for uniform distribution of hot air.

[0047] Furthermore, the wave-shaped structure 23 is a single set, distributed between the inclined air outlet 22 and the upper side of the branch channel 12, or between the inclined air outlet 22 and the lower side of the branch channel 12. This single set of wave-shaped structures simplifies the internal structure of the duct system while ensuring effective airflow guidance, reducing manufacturing complexity and cost. Moreover, it can specifically guide airflow on one side according to actual airflow characteristics, making airflow guidance more precise.

[0048] Furthermore, the angled air outlet 22 is positioned in the middle, lower, or upper part of the straightening wall 20. This configuration can meet the styling needs of different users for different parts of the hair. Whether it is to process the middle part of the hair to create a natural straight effect, to finely straighten the lower ends of the hair, or to shape the upper part of the hair, the hot air can be accurately applied to the target area, improving the practicality of the device.

[0049] Furthermore, at least one side of the branch channel 12 is arranged to gradually converge towards the oblique outlet 22 from one end connected to the main channel 11 to the end face of the branch channel 12, so that the length of the protrusion 231 and the recess 232 gradually decreases as the cross-sectional area of ​​the branch channel 12 gradually decreases. This design is adapted to the change in the cross-sectional area of ​​the branch channel 12, and the airflow guidance intensity can be adjusted by the change in the length of the wave-shaped structure 23 at different positions of the branch channel 12, ensuring that the airflow remains uniformly distributed during the flow process and avoiding the situation of concentrated or insufficient airflow due to the small cross-sectional area at the end of the branch channel 12.

[0050] Furthermore, the oblique air outlet 22 has a transition section 221 that is normally connected to the branch channel 12 and an inclined section 222 that is inclined to the straightening space 21. The angle between the inclined section 222 and the wall of the straightening wall 20 is 20°-60°. The transition section 221 allows the airflow to smoothly enter the oblique air outlet 22 from the branch channel 12, reducing energy loss; the 20°-60° angle allows the hot air to blow onto the hair at a suitable angle, ensuring the straightening effect without causing excessive damage to the hair due to improper angle, thus balancing styling and hair care.

[0051] Furthermore, the angled air outlet 22 has multiple angled air holes 220; a second partition 25 is provided between two adjacent angled air holes 220. The second partition 25 has an expansion portion 251 connected to the wave-shaped structure 23 and a sheet-like portion 252 formed on the expansion portion 251 and extending to the inclined section 222. The expansion portion 251 and the sheet-like portion 252 have an arc transition. The expansion portion 251 can receive the airflow guided by the wave-shaped structure 23 and smoothly transition it to the sheet-like portion 252, and then guide it to the angled air hole 220 from the sheet-like portion 252. The arc transition further reduces airflow resistance, so that each angled air hole 220 can obtain uniform airflow, improve the overall airflow effect, and make the hair more evenly heated and stressed.

[0052]

Example 3

[0053] Please see Figure 17-18 In this embodiment, the wave-shaped structure 23 has multiple elongated and staggered protrusions 231 and recesses 232, with an arc transition between adjacent protrusions 231 and recesses 232. This arc transition design allows the airflow to flow more smoothly within the branch channel 12, reducing the resistance to airflow between the protrusions 231 and recesses 232, avoiding turbulence, and thus providing a basic guarantee for the uniform distribution of airflow, enabling hot air to flow more stably towards the oblique air outlet 22.

[0054] The wave-shaped structure 23 is a single set, distributed between the inclined air outlet 22 and the upper side of the branch channel 12, or between the inclined air outlet 22 and the lower side of the branch channel 12. This single set of wave-shaped structures simplifies the internal structural layout of the duct system while ensuring effective airflow guidance, reducing manufacturing difficulty and costs. Furthermore, guiding airflow on one side allows for more precise control based on the flow characteristics within the branch channel 12, ensuring the airflow flows in the desired direction and improving the targeting and effectiveness of airflow guidance.

[0055] The angled air outlet 22 is located in the middle, lower, or upper part of the straightener 20. This design can meet the user's needs for straightening different parts of the hair. Whether it is straightening the middle part of the hair as a whole to make the hairstyle more neat; or doing a detailed treatment on the lower ends of the hair to create smooth ends; or shaping the upper part of the hair to increase the three-dimensionality of the hairstyle, the hot air can be accurately applied to the target area, greatly improving the applicability and practicality of the straightener.

[0056] At least one side of the branch channel 12 is arranged to gradually converge towards the oblique outlet 22 from one end connected to the main channel 11 to the end face of the branch channel 12, so that the length of the protrusion 231 and the recess 232 gradually decreases as the cross-sectional area of ​​the branch channel 12 gradually decreases. This design is consistent with the changing trend of the cross-sectional area of ​​the branch channel 12. As the cross-sectional area of ​​the branch channel 12 gradually decreases, the length of the protrusion 231 and the recess 232 also decreases accordingly. This can dynamically adjust the guiding force of the airflow, ensuring that the airflow is uniformly guided and distributed at all positions of the branch channel 12, avoiding the problem of airflow concentration or insufficientness caused by the shrinking space at the end of the branch channel 12, and ensuring the stability of the airflow output.

[0057] The angled air outlet 22 has a transition section 221 that is normally connected to the branch channel 12 and an inclined section 222 that is inclined to the straightening space 21. The transition section 221 allows the airflow from the branch channel 12 to smoothly enter the angled air outlet 22, reducing the energy loss of the airflow when entering the angled air outlet 22 and ensuring the strength of the airflow; while the inclined section 222 allows the airflow to blow onto the hair in the straightening space 21 at a suitable angle, enhancing the effect on the hair and helping to achieve the purpose of drying and straightening the hair more efficiently.

[0058] The oblique air outlet 22 has multiple oblique air holes 220; between two adjacent oblique air holes 220, there is an arc-shaped piece 26 that connects to the corrugated structure 23. The arc-shaped piece 26 protrudes from the air outlet surface of the branch channel 12. The corrugated structure 23 and the corresponding oblique air outlet 22 form an arc transition structure through the arc-shaped piece 26, and the outer surface of the arc-shaped piece 26 faces the air inlet 13 and corresponds to the area between two adjacent corrugated structures 23. The arrangement of the arc-shaped piece 26 further optimizes the transition between the corrugated structure 23 and the oblique air outlet 22, making the airflow from the corrugated structure 23 to the oblique air outlet 22 smoother and reducing airflow resistance. Meanwhile, the arc-shaped plate 26 protrudes from the air outlet surface of the branch channel 12 and faces the air inlet 13, which can guide the airflow entering from the air inlet 13 to a certain extent, guiding more airflow between the two adjacent wave-shaped structures 23, and then evenly distributing it to each oblique air outlet 220, effectively improving the uniformity of hot air distribution at the oblique air outlet 22, so that all parts of the hair can be subjected to uniform hot air, improving the straightening effect and hair care effect.

[0059] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A duct system for a hair straightening device, comprising a main body (10), the main body (10) having two hair straightening walls (20) spaced apart, forming a hair straightening space (21) for straightening or drying hair between the two hair straightening walls (20), a main flow channel (11) and two branch flow channels (12) connected to the main flow channel (11) are provided inside the main body (10), and the two branch flow channels (12) are arranged along the length direction of the two hair straightening walls (20). An elongated oblique air outlet (22) is provided along its length direction, and the direct-flow space (21) and the branch flow channel (12) are connected through the oblique air outlet (22); an air inlet (13) connected to the main flow channel (11) is provided on the air inlet body (10), so that the body (10) can form a directional fluid that enters from the air inlet (13), passes through the main flow channel (11) and the branch flow channel (12), and then blows from the oblique air outlet (22) to the direct-flow space (21). Its characteristic is that... The straight wall (20) has a wave-shaped structure (23) corresponding to the oblique air outlet (22) formed on the wall surface of the side corresponding to the branch channel (12). The wave-shaped structure (23) and the oblique air outlet (22) have an arc transition structure. The cross-sectional area of ​​the branch channel (12) gradually decreases from one end connected to the main channel (11) to its end. The longitudinal dimension of the wave-shaped structure (23) gradually decreases as the cross-sectional area of ​​the branch channel (12) gradually decreases.

2. The air duct system for a hair straightening device according to claim 1, characterized in that, The branch channel (12) has an air outlet surface that serves as the wall of the straight wall (20), two upper and lower side surfaces that are in contact with the air outlet surface, an opposite surface relative to the air outlet surface, and an end surface located at the end of the branch channel (12).

3. An air duct system for use in a straightening device according to claim 2, wherein, The wave-shaped structure (23) has multiple long strips of protrusions (231) and recesses (232) arranged in an alternating manner, with an arc transition between adjacent protrusions (231) and recesses (232).

4. The air duct system for a hair straightening device according to claim 3, characterized in that, The wave-shaped structure (23) has two sets, which are respectively distributed between the inclined air outlet (22) and the upper side of the branch channel (12) and between the inclined air outlet (22) and the lower side of the branch channel (12); Alternatively, the wave-shaped structure (23) is a single group, distributed between the oblique air outlet (22) and the upper side of the branch channel (12) or between the oblique air outlet (22) and the lower side of the branch channel (12).

5. An air duct system for use in a straightening device according to claim 4, wherein, The wave-shaped structure (23) has two sets, which are respectively distributed between the inclined air outlet (22) and the upper side of the branch channel (12) and between the inclined air outlet (22) and the lower side of the branch channel (12); Among them, the protrusions (231) of the two sets of wave-shaped structures (23) are connected to each other, and the recesses (232) of the two sets of wave-shaped structures (23) are connected to each other; Alternatively, the protrusions (231) of the two sets of wave-like structures (23) are staggered and the recesses (232) of the two sets of wave-like structures (23) are staggered.

6. An air duct system for use in a straightening device according to claim 5, wherein, The oblique air outlet (22) is located in the middle, lower or upper part of the straight wall (20).

7. An air duct system for use in a straightening device according to claim 5, wherein, The angle between the two sets of wavy structures (23) is 90°-180°.

8. An air duct system for a straightening device as defined in claim 4, wherein At least one side of the branch channel (12) is arranged to gradually approach the oblique air outlet (22) from one end connected to the main channel (11) to the end face of the branch channel (12), so that the length of the protrusion (231) and the recess (232) gradually decreases as the cross-sectional area of ​​the branch channel (12) gradually decreases.

9. An air duct system for use in a straightening device according to claim 1, wherein, The oblique air outlet (22) has a transition section (221) that is normally connected to the branch flow channel (12) and an oblique section (222) that is obliquely connected to the direct flow space (21).

10. A duct system for a hair straightening device according to claim 9, characterized in that, The angle between the inclined section (222) and the straight wall (20) is 20°-60°.

11. A duct system for a hair straightening device according to claim 9, characterized in that, The oblique air outlet (22) has multiple oblique air outlet holes (220); Among them, there is a first partition (24) between two adjacent oblique air outlets (220) as part of a wave-shaped structure (23), so that the wave-shaped structure (23) and the corresponding oblique air outlet (220) form an arc transition structure; the first partition (24) is located in the transition section (221), so that the oblique sections (222) of the long strip-shaped oblique air outlets (220) are all interconnected; Alternatively, a second partition (25) is provided between two adjacent oblique air outlets (220), the second partition (25) having an expansion portion (251) connected to the wave-shaped structure (23) and a sheet portion (252) formed on the expansion portion (251) and extending to the inclined section (222), with an arc transition between the expansion portion (251) and the sheet portion (252); Alternatively, there is an arc-shaped piece (26) between two adjacent oblique air outlets (220) that is connected to the wave-shaped structure (23). The arc-shaped piece (26) protrudes from the air outlet surface of the branch flow channel (12). The wave-shaped structure (23) is connected to the corresponding oblique air outlet 22 through the arc-shaped piece (26) in an arc transition structure. The outer side of the arc-shaped piece (26) faces the air inlet (13) and corresponds to the area between two adjacent wave-shaped structures (23).

12. The air duct system for a straightening device of claim 1, wherein, A diversion structure (14) is provided between the main flow channel (11) and the two branch flow channels (12), and the diversion structure (14) and the first wave-shaped structure (23) of the branch flow channel (12) are in an arc transition structure.

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