A hair dryer's air duct structure

Abstract

This utility model discloses an air duct structure for a hair dryer. It includes: a blower casing; a fan base housing disposed inside the blower casing and near the air inlet end, with a fan module housed inside the fan base housing; an air inlet mesh cover disposed at one port of the fan base housing; a heating element sleeve disposed inside the blower casing and near the air outlet end, with a heating element module housed inside the heating element sleeve; the opening of the heating element sleeve is fitted to and sealed to the other port of the fan base housing; the heating element sleeve and the fan base housing together form an air duct; and several air outlets disposed at the bottom of the heating element sleeve. The beneficial effect of this utility model is that it can improve the uniformity of the outlet air temperature.

Description

Technical Field

[0001] This utility model relates to the technical field of hair dryers, and in particular to the air duct structure of a hair dryer. Background Technology

[0002] A hair dryer consists of a set of resistance wires and a high-speed motor. The high-speed motor contains fan blades that blow air. When powered on, the resistance wires generate heat, and the air blown by the fan passes through the resistance wires, turning into hot air. If only the small fan is running, but the resistance wires are not heated, then only air will be blown out, not hot air.

[0003] Existing hair dryer products on the market typically have the following problems: the airflow distribution in the heating element area is extremely uneven, and infrared thermal imaging shows that traditional designs have obvious "hot spots" with local temperature differences reaching 30°C, resulting in a large temperature difference in the airflow. This not only affects the uniformity of hair drying but also shortens the lifespan of the heating element.

[0004] In summary, there is a need for a duct structure in a hair dryer that can improve the uniformity of the outlet air temperature. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of existing hair dryers, such as large temperature differences in the air outlet, which not only affect the uniformity of hair drying but also shorten the life of the heating element. It provides a duct structure for a hair dryer that can improve the uniformity of the air outlet temperature.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A hair dryer's air duct structure includes: air duct; A fan base housing is disposed inside the air duct and positioned near the air inlet end of the air duct. A fan module is disposed inside the fan base housing. An air inlet cover is provided at one of the ports of the fan base housing; A heating frame sleeve is disposed inside the air duct and positioned near the air outlet end of the air duct. A heating frame module is disposed inside the heating frame sleeve. The opening of the heating frame sleeve is adapted to the other end of the fan base housing and the two are sealed together. The heating frame sleeve and the fan base housing together form an air duct. Several air outlets are located at the bottom of the heating frame sleeve. The air outlets are evenly distributed in a ring about the central axis of the heating frame sleeve. Each air outlet consists of an acceleration section and a pressure stabilizing section, which are smoothly connected. The acceleration section is located at one end closer to the heating frame module. An acceleration ramp is provided on the side of the acceleration section closest to the central axis of the heating frame sleeve. The acute angle formed between the acceleration ramp and the central axis of the heating frame sleeve is greater than 45°. A flow stabilizing ramp is provided on the side of the acceleration section away from the central axis of the heating frame sleeve. The acute angle formed between the flow stabilizing ramp and the central axis of the heating frame sleeve is less than 45°. The diameter of the acceleration section gradually decreases from the end away from the pressure stabilizing section to the end closer to the pressure stabilizing section. The diameter of the pressure stabilizing section remains constant and matches the diameter of the acceleration section near the pressure stabilizing section. The geometric center line of the pressure stabilizing section is parallel to the central axis of the heating frame sleeve.

[0007] During operation, the fan module draws air in through the air inlet cover. The airflow passes through the duct formed by the fan base housing and the heating frame sleeve and is then blown out through the air outlet. The heating frame module heats the airflow to form hot air. This invention employs a composite structure design for the air outlet: a "dual-angle gradient contraction + end-pressure stabilization." The smooth contraction of the stabilizing slope on the outer side of the acceleration section maintains the core airflow velocity, while the steep contraction of the acceleration slope on the inner side enhances the acceleration effect, significantly increasing the wind speed. The end-pressure stabilization section forms a pressure stabilizing cavity, effectively eliminating eddies and reducing the outlet air temperature difference. This achieves a dual optimization of "acceleration + temperature uniformity," thus significantly improving the uniformity of the outlet air temperature and substantially increasing drying efficiency without increasing noise.

[0008] Preferably, the acute angle formed between the accelerating ramp and the central axis of the heating frame sleeve is 50°~55°, and the acute angle formed between the stabilizing ramp and the central axis of the heating frame sleeve is 10°~15°. The stabilizing ramp at 13° on the outer side of the accelerating section gently contracts to maintain the core airflow speed, while the accelerating ramp at 54° on the inner side of the accelerating section sharply contracts to enhance the acceleration effect, increasing the wind speed by 22% and greatly improving the hair drying efficiency.

[0009] Preferably, an air inlet shroud is provided at the air inlet of the air duct. The air inlet shroud has several guide ribs that are evenly distributed in a ring around the central axis of the air duct. The side of the guide ribs away from the air duct has a rounded transition design. The rounded corners of the guide ribs effectively guide the intake airflow, softening it and effectively solving the problems of excessive turbulence and poor noise performance at the air inlet, thus reducing high-frequency noise.

[0010] Preferably, a filter screen is provided on the inner side of the air inlet shroud, positioned between the air guide ribs and the air inlet cover. The filter screen has a mesh size of 0.2mm to 0.4mm. A metal filter screen with a 0.3mm mesh size can further disperse the airflow, making it smoother. The air inlet cover guides and gathers the airflow, effectively solving the problems of excessive turbulence and poor noise performance at the air inlet, reducing turbulence and lowering high-frequency noise.

[0011] Preferably, a fan sleeve is also provided inside the fan housing, and the fan module is placed inside the fan sleeve. A guide plate is fixed to one end of the fan sleeve near the air inlet cover. Several guide teeth are fixed on the guide plate, with the guide teeth positioned on the side of the guide plate facing the air inlet cover and the tips of the guide teeth pointing towards the air inlet cover. The guide teeth design on the guide plate further guides and softens the airflow, effectively solving the problems of excessive turbulence and poor noise performance at the air inlet, reducing inlet turbulence and lowering high-frequency noise.

[0012] Preferably, the opening of the heating element sleeve and the other end of the fan base housing are smoothly connected. The connection between the heating element sleeve and the fan base housing adopts a smooth airflow design, which optimizes the airflow path, improves the smoothness of the path, reduces wind noise and resistance, and increases wind speed.

[0013] Preferably, the heating frame module is provided with a heating frame base guide, which is located at the center of the opening of the heating frame sleeve. The cross-sectional width of the heating frame base guide gradually increases from the end closer to the fan module to the end farther away from the fan module. By adding a heating frame base guide at the connection between the heating frame sleeve and the fan base housing, the air entering the heating frame sleeve can be more uniform, guiding the airflow and differentiating the airflow flowing towards the heating frame module, thereby improving the uniformity of airflow heating.

[0014] Preferably, the fan base housing has a cable routing hole on its side wall, a flexible cable plug is installed at the cable routing hole, and a flexible cable plug cover is also provided on the outer surface of the fan base housing, with the flexible cable plug cover placed outside the flexible cable plug. This utility model adopts a cable concealment design, with cable routing holes opened in the inner wall of the air duct to lead out the cable, which is then tightly closed with the flexible cable plug and flexible cable plug cover, achieving orderly storage of the cable and solving the problem of numerous and messy cables in the air duct.

[0015] The beneficial effects of this utility model are: it improves the uniformity of the outlet air temperature and significantly improves the drying efficiency without increasing noise; it increases the wind speed and improves the drying efficiency; it solves the problem of excessive turbulence at the air inlet and poor noise performance, reduces turbulence at the air inlet and lowers high-frequency noise; it optimizes the airflow path and improves the smoothness of the path; it improves the uniformity of airflow heating; and it makes the production line neatly organized. Attached Figure Description

[0016] Figure 1 This is an exploded view of this utility model; Figure 2 This is a diagram of the internal structure of this utility model; Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0017] In the diagram: 1. Air duct, 2. Fan base housing, 3. Fan module, 4. Air inlet cover, 5. Heating frame sleeve, 6. Heating frame module, 7. Air outlet, 8. Acceleration section, 9. Voltage stabilization section, 10. Acceleration ramp, 11. Flow stabilization ramp, 12. Air inlet hood, 13. Guide rib, 14. Filter screen, 15. Fan sleeve, 16. Guide teeth, 17. Heating frame base guide, 18. Cable routing hole, 19. Flexible cable plug, 20. Flexible cable plug cover. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1-3 In the embodiments described above, a hair dryer's air duct structure includes: Air duct 1; The fan base housing 2 is located inside the air duct 1 and near the air inlet end of the air duct 1. The fan module 3 is installed inside the fan base housing 2. The air inlet cover 4 is located at one of the ports of the fan base housing 2; Heating frame sleeve 5 is set inside the air duct 1 and positioned near the air outlet end of the air duct 1. Heating frame module 6 is set inside the heating frame sleeve 5. The opening of the heating frame sleeve 5 is adapted to the other end of the fan base housing 2 and the two are sealed together. The heating frame sleeve 5 and the fan base housing 2 together form an air duct. Several air outlets 7 are located at the bottom of the heating frame sleeve 5. The air outlets 7 are evenly distributed in a ring about the central axis of the heating frame sleeve 5. The air outlets 7 are composed of an acceleration section 8 and a pressure stabilizing section 9, which are smoothly connected. The acceleration section 8 is located at one end close to the heating frame module 6. An acceleration ramp 10 is provided on the side of the acceleration section 8 close to the central axis of the heating frame sleeve 5. The acute angle formed between the acceleration ramp 10 and the central axis of the heating frame sleeve 5 is greater than 45°. A flow stabilizing ramp 11 is provided on the side of the acceleration section 8 away from the central axis of the heating frame sleeve 5. The acute angle formed between the flow stabilizing ramp 11 and the central axis of the heating frame sleeve 5 is less than 45°. The diameter of the acceleration section 8 gradually decreases from the end away from the pressure stabilizing section 9 to the end close to the pressure stabilizing section 9. The diameter of the pressure stabilizing section 9 remains constant and matches the diameter of the end of the acceleration section 8 close to the pressure stabilizing section 9. The geometric center line of the pressure stabilizing section 9 is parallel to the central axis of the heating frame sleeve 5.

[0020] The openings at both ends of the air outlet 7 are rounded to further increase the airflow and improve the drying speed.

[0021] The acute angle formed between the accelerating inclined plane 10 and the central axis of the heating frame sleeve 5 is 54°, and the acute angle formed between the stabilizing inclined plane 11 and the central axis of the heating frame sleeve 5 is 13°.

[0022] An air inlet shroud 12 is provided at the air inlet port of the air duct 1. Several guide ribs 13 are provided on the air inlet shroud 12. The guide ribs 13 are evenly distributed in a ring about the central axis of the air duct 1. The side of the guide ribs 13 away from the air duct 1 adopts a rounded transition design.

[0023] A filter screen 14 is provided on the inner side of the air inlet shroud 12. The filter screen 14 is placed between the air guide rib 13 and the air inlet cover 4. The mesh size of the filter screen 14 is 0.3mm.

[0024] Inside the fan housing 2, there is also a fan sleeve 15. The fan module 3 is placed inside the fan sleeve 15. A guide plate is fixed at one end of the fan sleeve 15 near the air inlet cover 4. Several guide teeth 16 are fixed on the guide plate. The guide teeth 16 are placed on the side of the guide plate facing the air inlet cover 4 and the tips of the guide teeth 16 face the air inlet cover 4.

[0025] The opening of the heating frame sleeve 5 and the other port of the fan base housing 2 are smoothly connected.

[0026] The heating frame module 6 is provided with a heating frame base guide fluid 17, which is located at the center of the opening of the heating frame sleeve 5. The cross-sectional width of the heating frame base guide fluid 17 gradually increases from the end closer to the fan module 3 to the end farther away from the fan module 3.

[0027] The fan housing 2 has a cable routing hole 18 on its side wall, and a flexible cable plug 19 is installed at the cable routing hole 18. A flexible cable plug cover 20 is also provided on the outer surface of the fan housing 2, and the flexible cable plug cover 20 is placed outside the flexible cable plug 19.

[0028] A handle is connected to the air duct 1. This application solves the problem of the control board affecting the airflow in the air duct by placing the control board inside the handle instead of in the air duct. At the same time, it avoids the high temperature impact of the heating element on the control board. This application adopts a compact spatial layout, retaining only the heating frame module and the fan module as the two core components in the air duct, eliminating redundant components such as circuit boards, reducing the size of the body, conforming to ergonomic design, and improving the user's grip experience.

[0029] In this application, the components are assembled and connected by clips, screws, or a combination of clips and screws, which is prior art and will not be described in detail here.

[0030] Air outlet principle: The fan module 3 draws in air from the air inlet shroud 12, and after the airflow passes through the air duct formed by the fan base housing 2 and the heating frame sleeve 5, it is blown out from the air outlet 7. The heating frame module 6 can heat the airflow to form hot air.

[0031] At the air inlet, this application uses four layers of guide ribs 13 on the air inlet cover 12, stainless steel filter screen 14, air inlet cover 4, and guide teeth 16 on the fan sleeve 15 to guide and soften the airflow layer by layer, which effectively solves the problem of excessive turbulence and poor noise performance at the air inlet, reduces air inlet turbulence, and lowers high-frequency noise.

[0032] At the connection between the heating frame sleeve 5 and the fan base housing 2, this application adopts a smooth air duct design, which optimizes the airflow path, improves the path smoothness, and makes the airflow smoother when passing through this air duct. Furthermore, a heating frame base guide 17 is added at the connection between the heating frame sleeve 5 and the fan base housing 2 to guide the airflow, differentiate the airflow flowing to the heating frame module 6, make the air entering the heating frame module 6 more uniform, and improve the uniformity of airflow heating.

[0033] At the air outlet, this application adopts a composite air outlet 7 with "dual-angle gradient contraction + end pressure stabilization". The 13° stabilizing slope 11 on the outer side of the acceleration section 8 gently contracts to maintain the core speed of the airflow, while the 54° acceleration slope 10 on the inner side of the acceleration section 8 sharply contracts to enhance the acceleration effect, thereby increasing the wind speed by 22%. The 1.7mm end pressure stabilizing section 9 forms a pressure stabilizing cavity, which can effectively eliminate eddies and reduce the temperature difference of the outlet air, achieving a dual optimization of "acceleration + uniform temperature". The uniformity of the outlet air temperature is improved by 80%, and the drying efficiency is significantly improved without increasing noise.

Claims

1. A duct structure of a hair dryer, characterized by comprising: include: Ventilation duct (1); The fan base housing (2) is located inside the air duct (1) and near the air inlet end of the air duct (1). The fan base housing (2) contains a fan module (3). An air inlet cover (4) is provided at one of the ports of the fan base housing (2); Heating frame sleeve (5) is set inside the air duct (1) and positioned near the air outlet of the air duct (1). Heating frame module (6) is provided inside the heating frame sleeve (5). The opening of the heating frame sleeve (5) is adapted to the other end of the fan base housing (2) and the two are sealed together. The heating frame sleeve (5) and the fan base housing (2) together form an air duct. Several air outlets (7) are provided at the bottom of the heating frame sleeve (5). The air outlets (7) are evenly distributed in a ring about the central axis of the heating frame sleeve (5). The air outlets (7) are composed of an acceleration section (8) and a voltage stabilizing section (9) and are smoothly connected. The acceleration section (8) is located at one end close to the heating frame module (6). An acceleration ramp (10) is provided on the side of the acceleration section (8) close to the central axis of the heating frame sleeve (5). The acute angle formed between the acceleration ramp (10) and the central axis of the heating frame sleeve (5) is greater than 45°. The acceleration section (8) is provided with a flow stabilizing slope (11) on the side away from the central axis of the heating frame sleeve (5). The acute angle formed between the flow stabilizing slope (11) and the central axis of the heating frame sleeve (5) is less than 45°. The aperture of the acceleration section (8) gradually decreases from the end away from the pressure stabilizing section (9) to the end close to the pressure stabilizing section (9). The aperture of the pressure stabilizing section (9) remains constant and is adapted to the aperture of the end of the acceleration section (8) close to the pressure stabilizing section (9). The geometric center line of the pressure stabilizing section (9) is parallel to the central axis of the heating frame sleeve (5).

2. The air duct structure of a hair dryer according to claim 1, wherein The acute angle formed between the acceleration ramp (10) and the central axis of the heating frame sleeve (5) is 50°~55°, and the acute angle formed between the flow stabilizing ramp (11) and the central axis of the heating frame sleeve (5) is 10°~15°.

3. The air duct structure of a hair dryer according to claim 1, wherein An air inlet hood (12) is provided at the air inlet port of the air duct (1). Several guide ribs (13) are provided on the air inlet hood (12). The guide ribs (13) are evenly distributed in a ring about the central axis of the air duct (1). The side of the guide ribs (13) away from the air duct (1) adopts a rounded transition design.

4. The air duct structure of a hair dryer according to claim 3, wherein The air inlet cover (12) is provided with a filter screen (14) on its inner side. The filter screen (14) is placed between the guide rib (13) and the air inlet cover (4). The mesh size of the filter screen (14) is 0.2mm~0.4mm.

5. The air duct structure of a hair dryer according to claim 1, wherein The fan housing (2) is also provided with a fan sleeve (15). The fan module (3) is placed inside the fan sleeve (15). A guide plate is fixed at one end of the fan sleeve (15) near the air inlet cover (4). Several guide teeth (16) are fixed on the guide plate. The guide teeth (16) are placed on the side of the guide plate facing the air inlet cover (4) and the tips of the guide teeth (16) face the air inlet cover (4).

6. The air duct structure of a hair dryer according to any one of claims 1 to 5, wherein The opening of the heating frame sleeve (5) is smoothly connected to the other port of the fan base housing (2).

7. The air duct structure of a hair dryer according to any one of claims 1 to 5, wherein The heating frame module (6) is provided with a heating frame base guide fluid (17). The heating frame base guide fluid (17) is located at the center of the opening of the heating frame sleeve (5). The cross-sectional width of the heating frame base guide fluid (17) gradually increases from the end near the fan module (3) to the end away from the fan module (3).

8. The air duct structure of a hair dryer according to any one of claims 1 to 5, wherein The fan base housing (2) has a cable routing hole (18) on its side wall. A flexible cable plug (19) is installed at the cable routing hole (18). A flexible cable plug cover (20) is also provided on the outer surface of the fan base housing (2). The flexible cable plug cover (20) is placed outside the flexible cable plug (19).

Images