Dual-channel hair dryer

Abstract

This utility model discloses a dual-channel hair dryer belonging to the field of hair dryer technology, including an inner cylinder, a main motor located on the inner rear side of the inner cylinder, a heat insulation cylinder and a mica cylinder snap-fitted to the front end of the inner cylinder, the heat insulation cylinder being concentrically fitted onto the outer wall of the mica cylinder, an air outlet cover snap-fitted to the front end of the heat insulation cylinder, an outer cylinder, the upper part of the outer cylinder covering the outer side of the inner cylinder, an auxiliary motor located on the inner lower part of the outer cylinder, a front cylinder for air outlet snap-fitted to the front end of the outer cylinder, the heat insulation cylinder being tightly fitted into the front cylinder, and a control board located on the inner front side of the inner cylinder, the control board being electrically connected to the main motor and the auxiliary motor. This utility model outputs hot air through a first air duct path and / or outputs natural wind through a second air duct path, using dual air ducts to deliver airflow, enhancing air volume output and providing efficient blowing. The heat insulation cylinder prevents heat from the heating element from being conducted to the front cylinder, preventing the outer wall from becoming too hot to touch, ensuring safe and comfortable use.

Description

Technical Field

[0001] This utility model belongs to the field of hair dryer technology, and relates to a dual-air-duct hair dryer. Background Technology

[0002] In daily hair care and professional hairdressing scenarios, hair dryers are an indispensable tool, and their user experience and performance have a key impact on meeting user needs.

[0003] Currently, the traditional hair dryers widely used in the market adopt a structural design with a single motor and a single air duct. The motor output power and airflow efficiency of the air duct are limited, resulting in low air pressure and less air volume during actual operation, which prolongs the hair drying time and affects the user experience. Traditional hair dryers have heating elements installed in the air duct. The heat generated during operation is easily conducted to the surface of the outer shell, causing the outer shell to become hot to the touch, affecting the convenience of operation and making it difficult to meet users' needs for efficient and safe use. Utility Model Content

[0004] This utility model provides a dual-airflow hair dryer, which aims to solve the problems of weak airflow and hot casing caused by heating elements in traditional hair dryers with single airflow, making it difficult to meet users' needs for efficient and safe use.

[0005] To achieve the above objectives, this utility model provides a dual-duct hair dryer, comprising:

[0006] The inner cylinder has a main motor installed on the inner rear side. The front end of the inner cylinder is fitted with a heat insulation cylinder and a mica cylinder. The heat insulation cylinder is concentrically fitted onto the outer wall of the mica cylinder. The front end of the heat insulation cylinder is fitted with an air outlet cover. Driven by the main motor, the wind energy is output sequentially along the inner cylinder, the mica cylinder, and the air outlet cover to form the first air duct path.

[0007] The outer cylinder has its upper part wrapped around the outer side of the inner cylinder. An auxiliary motor is provided on the lower inner side of the outer cylinder. A front cylinder for air outlet is snapped onto the front end of the outer cylinder. The heat insulation cylinder is fitted tightly inside the front cylinder. Driven by the auxiliary motor, the air is sequentially output along the lower inner side of the outer cylinder, the gap between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and the gap between the inner wall of the front cylinder and the outer wall of the heat insulation cylinder, forming a second air duct path. The outer cylinder and the inner cylinder, as well as the front cylinder and the heat insulation cylinder, are all coaxially arranged.

[0008] A control board is provided on the inner side of the front part of the inner cylinder, and the control board is electrically connected to the main motor and the auxiliary motor.

[0009] Preferably, the mica tube is provided with a heating element, and the two ends of the mica tube are respectively tightly connected to the front end of the inner tube and the inner side of the air outlet cover. The air outlet cover is provided with a plurality of first air outlets in a circular array, and the control board is electrically connected to the heating element.

[0010] Preferably, the outer wall of the heat insulation cylinder is provided with a plurality of first supporting ribs arranged in a ring array. The first supporting ribs are used to press against the inner wall of the front cylinder to form a first air cavity channel. The outer wall of the inner cylinder is provided with a plurality of second supporting ribs arranged in a ring array. The second supporting ribs are used to press against the inner wall of the outer cylinder to form a second air cavity channel. The first air cavity channel and the second air cavity channel are connected.

[0011] Preferably, the front end face of the front cylinder is provided with a plurality of second air outlets in an annular array, the front end face of the front cylinder is provided with an assembly hole at the center, the air outlet cover is snapped and fitted in the assembly hole, and the first air outlet and the second air outlet are flush.

[0012] Preferably, the outer cylinder is fully covered by a fan housing, the front end of the fan housing is connected to the front cylinder, the rear part of the fan housing is provided with a plurality of first air inlets, the first air inlets are located behind the main motor, and the lower part of the fan housing is provided with a plurality of second air inlets, the second air inlets are located below the auxiliary motor.

[0013] Preferably, the upper part of the outer cylinder is provided with a first circuit board, and the fan housing is provided with a plurality of first buttons at the corresponding positions of the first circuit board. The first buttons are connected to the first circuit board, and the first circuit board is used to adjust the speed of the main motor.

[0014] Preferably, a second circuit board is provided on the lower front side of the outer cylinder, and a second button is provided on the fan housing at the corresponding position of the second circuit board. The second button is connected to the second circuit board, and the second circuit board is used to start or stop the auxiliary motor.

[0015] Preferably, a power board is provided on the lower inner side of the fan casing, and the power board is electrically connected to the control board, the first circuit board, and the second circuit board.

[0016] Preferably, a fan power cord is provided at the bottom of the fan casing, and the power cord is electrically connected to the power board.

[0017] Preferably, a pressure line is provided on the inner side of the bottom of the fan housing, and the pressure line is used to press the power cord to prevent it from falling off.

[0018] The advantages of this utility model over the prior art are:

[0019] This utility model provides a dual-channel hair dryer that outputs hot air through a first channel and / or natural air through a second channel. The dual-channel air delivery enhances airflow output and provides efficient blowing. The heat insulation cylinder prevents the heat from the heating element from being conducted to the front cylinder, so the outer wall will not be hot to the touch, making it safe and comfortable to use.

[0020] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0022] Figure 2 This is a two-dimensional structural diagram of the present invention from a different perspective;

[0023] Figure 3 for Figure 1 A schematic diagram of the decomposed structure;

[0024] Figure 4 This is the front view of the present invention;

[0025] Figure 5 for Figure 4 A schematic diagram of the AA cross-sectional structure in the diagram;

[0026] Figure 6 This is a cross-sectional structural diagram of the first air duct path of this utility model;

[0027] Figure 7 This is an exploded structural diagram of the first air duct path of this utility model;

[0028] Figure 8 for Figure 6 Schematic diagram of the BB cross-sectional structure in the middle;

[0029] Figure 9 This is a cross-sectional structural diagram of the second air duct path of this utility model;

[0030] Figure 10 This is an exploded structural diagram of the second air duct path of this utility model;

[0031] Figure 11 for Figure 9 Schematic diagram of the CC cross-section structure in the image;

[0032] Figure label:

[0033] 1. Inner cylinder; 101. Second support rib; 2. Main motor; 3. Heat insulation cylinder; 301. First support rib; 4. Air outlet cover; 401. First air outlet; 5. Outer cylinder; 6. Auxiliary motor; 7. Front cylinder; 701. Second air outlet; 702. Assembly hole; 8. Control board; 9. Mica cylinder; 10. Heating element; 11. Fan housing; 12. First air inlet; 13. Second air inlet; 14. First circuit board; 15. First button; 16. Second circuit board; 17. Second button; 18. Power board; 19. Power cord; 20. Pressure line. Detailed Implementation

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] To achieve the above objectives, this utility model provides a dual-duct blower, see reference. Figures 1-11 As shown, it includes:

[0037] The inner cylinder 1 has a main motor 2 installed on the inner rear side. The front end of the inner cylinder 1 is fitted with a heat insulation cylinder 3 and a mica cylinder 9. The heat insulation cylinder 3 is concentrically fitted onto the outer wall of the mica cylinder 9. The front end of the heat insulation cylinder 3 is fitted with an air outlet cover 4. Driven by the main motor 2, the air energy is sequentially output along the inner cylinder 1, the mica cylinder 9, and the air outlet cover 4 to form the first air duct path.

[0038] The outer cylinder 5 has its upper part wrapped around the outer side of the inner cylinder 1. An auxiliary motor 6 is provided on the lower inner side of the outer cylinder 5. A front cylinder 7 for air outlet is snapped onto the front end of the outer cylinder 5. The heat insulation cylinder 3 is fitted tightly into the front cylinder 7. Driven by the auxiliary motor 6, the air energy is sequentially output along the lower inner side of the outer cylinder 5, the gap between the inner wall of the outer cylinder 5 and the outer wall of the inner cylinder 1, and the gap between the inner wall of the front cylinder 7 and the outer wall of the heat insulation cylinder 3, forming a second air duct path. The outer cylinder 5 and the inner cylinder 1, as well as the front cylinder 7 and the heat insulation cylinder 3, are all coaxially arranged.

[0039] Control board 8 is provided on the inner side of the front part of the inner cylinder 1. Control board 8 is electrically connected to the main motor 2 and the auxiliary motor 6.

[0040] In this embodiment, the inner cylinder 1 is a hollow cylindrical structure. A motor mounting slot is reserved on the inner side of the rear part of the inner cylinder 1. The main motor 2 is fixed by bolts. The output end of the main motor 2 is equipped with a centrifugal fan blade, which can efficiently introduce air from the rear end and push it to the front end, providing stable airflow power for the first air duct path. The front end of the inner cylinder 1 is designed with an annular buckle protrusion, which is adapted to the annular buckle groove at the rear end of the heat insulation cylinder 3. The buckle sleeve realizes a detachable connection, which is convenient for later maintenance and component replacement. The two ends of the mica cylinder 9 are tightly abutted to form a sealed structure, ensuring that the airflow driven by the main motor 2 can flow through the mica cylinder 9. The front end of the heat insulation cylinder 3 is connected to the air outlet cover 4 by a buckle sleeve. The air outlet cover 4 is a circular cover plate with multiple first air outlets 401 processed along the annular array on the end face, and the air is concentrated for output. The outer cylinder 5 is a hollow cylindrical structure with a diameter larger than that of the inner cylinder 1. The outer cylinder 5 and the inner cylinder 1 are coaxially arranged. The lower inner side of the outer cylinder 5 has a reserved mounting position for the auxiliary motor 6. The auxiliary motor 6 can be fixed by the bracket to provide independent airflow power for the second air duct path. It can be started and stopped independently or used in conjunction with the main motor 2 to achieve flexible control of natural wind.

[0041] Furthermore, a heating element 10 is provided inside the mica tube 9. The two ends of the mica tube 9 are tightly connected to the front end of the inner tube 1 and the inner side of the air outlet cover 4, respectively. Several first air outlets 401 are arranged in a ring array on the air outlet cover 4. The control board 8 is electrically connected to the heating element 10.

[0042] In this embodiment, the mica tube 9 is made of natural mica sheets, which has high temperature resistance and insulation. The heating element 10 is arranged inside the mica tube 9, which can isolate the heating element 10 from the heat insulation tube 3, so as to avoid the heating element 10 directly contacting the heat insulation tube 3 and causing local overheating. By adding the heat insulation tube 3, the heat conduction to the front tube 7 is blocked, ensuring that the outer wall of the front tube 7 is not hot to the touch. It has both insulation and heat insulation properties, which can effectively block heat conduction. The heating element 10 can be a nickel-chromium alloy heating wire, a ceramic heating element 10, or a quartz tube heating element 10. The temperature is adjusted by the pulse width modulation signal output by the control board 8.

[0043] Furthermore, the outer wall of the heat insulation cylinder 3 is provided with a plurality of first support ribs 301 arranged in a ring. The first support ribs 301 are used to press against the inner wall of the front cylinder 7 to form a first air cavity channel. The outer wall of the inner cylinder 1 is provided with a plurality of second support ribs 101 arranged in a ring. The second support ribs 101 are used to press against the inner wall of the outer cylinder 5 to form a second air cavity channel. The first air cavity channel and the second air cavity channel are connected.

[0044] In this embodiment, the first supporting rib 301 abuts against the inner wall of the front cylinder 7 to ensure the coaxiality between the heat insulation cylinder 3 and the front cylinder 7, and the second supporting rib 101 abuts against the inner wall of the outer cylinder 5 to ensure the coaxiality between the inner cylinder 1 and the outer cylinder 5. The first air cavity channel and the second air cavity channel are connected to guide the airflow to smoothly transition from the second air cavity channel to the first air cavity channel, reduce the resistance loss of the airflow at the connection point, and enable the airflow driven by the auxiliary motor 6 to flow smoothly.

[0045] Furthermore, the front end face of the front cylinder 7 is provided with a number of second air outlets 701 in a ring array, and the front end face of the front cylinder 7 is provided with an assembly hole 702 at the center. The air outlet cover 4 is snapped and fitted in the assembly hole 702, and the first air outlet 401 is flush with the second air outlet 701.

[0046] In this embodiment, the front cylinder 7 is a cylindrical structure with a closed front end and an open rear end. An assembly hole 702 is machined at the center of the front end face. The air outlet cover 4 is installed in the assembly hole 702 by snap fastening to ensure that the two are connected firmly and sealed. The end face of the second air outlet 701 is flush with the end face of the first air outlet 401 to avoid interference when the two airflows are output.

[0047] The outer cylinder 5 is fully covered by a fan housing 11. The front end of the fan housing 11 is connected to the front cylinder 7. The rear part of the fan housing 11 is provided with several first air inlets 12, which are located behind the main motor 2. The lower part of the fan housing 11 is provided with several second air inlets 13, which are located below the auxiliary motor 6.

[0048] Furthermore, the upper part of the outer cylinder 5 is provided with a first circuit board 14, and the fan housing 11 is provided with a number of first buttons 15 at the corresponding positions of the first circuit board 14. The first buttons 15 are connected to the first circuit board 14. The first circuit board 14 is used to adjust the speed of the main motor 2. The first buttons 15 have 4 levels, which correspond to the speed of the main motor 2, and the output air volume can be adjusted according to the needs.

[0049] Furthermore, a second circuit board 16 is provided on the lower front side of the outer cylinder 5, and a second button 17 is provided on the fan housing 11 at the corresponding position of the second circuit board 16. The second button 17 is connected to the second circuit board 16. The second circuit board 16 is used to start or stop the auxiliary motor 6. Since the auxiliary motor 6 delivers natural wind (such as cold air), starting the second button 17 increases the air volume of the second air duct path. Combined with the air volume output from the first air volume path, the two output together to form a larger air volume, including hot air and cold air, which makes the drying effect better.

[0050] Furthermore, a power board 18 is provided on the lower inner side of the fan housing 11. The power board 18 is electrically connected to the control board 8, the first circuit board 14, and the second circuit board 16. A fan power cord 19 is provided at the bottom of the fan housing 11. The power cord 19 is electrically connected to the power board 18. A pressure line 20 is provided on the bottom inner side of the fan housing 11. The pressure line 20 is used to press the power cord 19 to prevent it from falling off.

[0051] In one embodiment, the first air duct path forms a unidirectional airflow channel through the first air inlet 12, the main motor 2, the inner cylinder 1, the mica cylinder 9, and the first air outlet 401. This channel is primarily used to deliver hot air. Of course, when the heating element 10 is not operating, the first air duct path can also output natural air. When the main motor 2 starts, it drives the centrifugal fan blades to rotate at high speed. The resulting negative pressure forces outside air to enter through the first air inlet 12 at the rear of the fan housing 11. A dust filter can be installed inside the first air inlet 12 to filter impurities in the air, preventing dust and hair from entering the inner cylinder 1 and affecting the main motor 2 or blocking the air duct. After entering the rear of the inner cylinder 1, the air is accelerated by the high-speed rotating fan blades, forming a directional airflow. The airflow flows forward along the internal cavity of the inner cylinder 1. The cylindrical structure of the inner cylinder 1 ensures stable airflow. When the airflow passes through the mica cylinder 9, the control board 8 adjusts the temperature according to the user-set temperature... The corresponding current is output to the heating element 10 at the specified temperature setting. The heating element 10 is powered on and generates heat. The heat is transferred to the airflow through heat conduction and heat radiation, causing the airflow temperature to rise. The heat insulation effect of the mica tube 9 can prevent heat from being directly transferred to the heat insulation tube 3, thus avoiding the temperature rise of the outer wall. The heated airflow continues to flow forward along the internal channel of the mica tube 9 and is finally output through the first air outlet 401 on the air outlet cover 4. It is suitable for use in scenarios such as hair drying and styling. Users can start and stop the first air duct path, adjust the speed and control the temperature by pressing the first button 15 on the fan housing 11.

[0052] In another embodiment, the second air duct path is a natural airflow channel, requiring no heating components. Specifically, the path includes the second air inlet 13, the auxiliary motor 6, the lower inner cavity of the outer cylinder 5, the second air cavity channel between the inner wall of the outer cylinder 5 and the outer wall of the inner cylinder 1, the first air cavity channel between the inner wall of the front cylinder 7 and the outer wall of the insulation cylinder 3, and the second air outlet 701 of the front cylinder 7, forming an independent natural airflow channel. When the auxiliary motor 6 starts, it drives the centrifugal fan blades to rotate, generating negative pressure that forces outside air to enter through the second air inlet 13 at the bottom of the fan housing 11. A dust filter is installed inside the air inlet to filter impurities, ensuring clean airflow. After entering the lower inner cavity of the outer cylinder 5, the air is accelerated by the fan blades of the auxiliary motor 6, forming a directional airflow. The airflow flows upward along the lower inner cavity of the outer cylinder 5 and enters the second air cavity channel between the outer cylinder 5 and the inner cylinder 1. Because the second supporting rib 101 on the outer side of the inner cylinder 1 abuts against the inner wall of the outer cylinder 5, the second air cavity channel has a uniform annular gap, ensuring stable airflow within the channel. The airflow is then directed through the front end of the second air cavity channel and into the first air cavity channel between the front cylinder 7 and the heat insulation cylinder 3 (formed by the first supporting rib 301), achieving a smooth transition of airflow. The airflow flows forward along the first air cavity channel and finally outputs natural wind through the second air outlet 701 on the front cylinder 7. The second air outlet 701 is flush with the first air outlet 401 and can mix with the hot air in the first air duct path to form a mixed wind with a moderate temperature, or it can output natural wind alone. The user can independently start and stop the second air duct path by pressing the second button 17 on the fan housing 11.

[0053] During assembly, the main motor 2 is fixed to the motor mounting slot at the rear of the inner cylinder 1 with bolts, the control plate 8 is fixed to the inner side of the front of the inner cylinder 1, the mica cylinder 9 is fitted into the annular groove on the inner wall of the heat insulation cylinder 3, the mica cylinder 9 and the heat insulation cylinder 3 are fixedly connected by an interference fit, the heating element 10 is arranged inside the mica cylinder 9, the buckle groove at the rear end of the heat insulation cylinder 3 is aligned with the buckle protrusion at the front end of the inner cylinder 1, and axial force is applied to make the two engage, ensuring that the rear end of the mica cylinder 9 is pressed against the front end face of the inner cylinder 1, the buckle at the rear end of the air outlet cover 4 is aligned with the buckle groove at the front end of the heat insulation cylinder 3, ensuring that the front end of the mica cylinder 9 is pressed against the inner stepped surface of the air outlet cover 4, thus completing the assembly of the first air duct path.

[0054] Install the outer cylinder 5 onto the outside of the inner cylinder 1 of the already assembled first air duct path. Fix the auxiliary motor 6 to the lower inner side of the outer cylinder 5. Align and engage the snap-fit ​​groove at the rear end of the front cylinder 7 with the snap-fit ​​protrusion at the front end of the outer cylinder 5, so that the first support rib 301 on the outside of the heat insulation cylinder 3 abuts against the inner wall of the front cylinder 7, ensuring that the front cylinder 7 and the heat insulation cylinder 3 are coaxial. Sleeve the fan housing 11 onto the outer cylinder 5 from the outside, so that the front end of the fan housing 11 abuts against the rear end of the front cylinder 7. Fix the first circuit board 14 to the upper part of the outer cylinder 5 and install the first button 15 to the corresponding part of the fan housing 11. Position the second circuit board 16 fixed on the lower front side of the outer cylinder 5, assemble the second button 17 to the corresponding position of the fan housing 11, fix the power board 18 on the lower inner side of the fan housing 11, pass one end of the power cord 19 through the bottom of the fan housing 11 and connect it to the power board 18, use the pressure strip 20 to fix it to the bottom inner side of the fan housing 11 with screws, so that the pressure strip 20 presses the power cord 19 to prevent it from falling off; check the assembly status to ensure that the buckles are engaged in place, the connection is reliable, and the airflow channel is not blocked, tighten the screws to complete the overall assembly of the fan housing 11.

[0055] In summary, this utility model provides a dual-airflow hair dryer that outputs hot air through a first airflow path and / or outputs natural air through a second airflow path, constructing a concentric double-tube and dual-airflow design to achieve independent or mixed output of hot air and natural air. This not only improves the blowing efficiency but also solves the problem of the traditional hair dryer's casing getting too hot to handle. At the same time, the modular assembly design facilitates manufacturing and subsequent maintenance, effectively meeting users' needs for a high-efficiency and safe hair dryer.

[0056] The technical principles of this utility model have been described above with reference to specific embodiments, which are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments; all technical solutions falling within the scope of this utility model's concept are protected. Other specific embodiments of this utility model that can be conceived by those skilled in the art without creative effort will also fall within the protection scope of this utility model.

Claims

1. A dual-airflow hair dryer, characterized in that, include: The inner cylinder has a main motor installed on the inner rear side. The front end of the inner cylinder is fitted with a heat insulation cylinder and a mica cylinder. The heat insulation cylinder is concentrically fitted onto the outer wall of the mica cylinder. The front end of the heat insulation cylinder is fitted with an air outlet cover. Driven by the main motor, the wind energy is output sequentially along the inner cylinder, the mica cylinder, and the air outlet cover to form the first air duct path. The outer cylinder has its upper part wrapped around the outer side of the inner cylinder. An auxiliary motor is provided on the lower inner side of the outer cylinder. A front cylinder for air outlet is snapped onto the front end of the outer cylinder. The heat insulation cylinder is fitted tightly inside the front cylinder. Driven by the auxiliary motor, the air is sequentially output along the lower inner side of the outer cylinder, the gap between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and the gap between the inner wall of the front cylinder and the outer wall of the heat insulation cylinder, forming a second air duct path. The outer cylinder and the inner cylinder, as well as the front cylinder and the heat insulation cylinder, are all coaxially arranged. A control board is provided on the inner side of the front part of the inner cylinder, and the control board is electrically connected to the main motor and the auxiliary motor.

2. The dual-duct blower according to claim 1, characterized in that, The mica tube contains a heating element. Both ends of the mica tube are tightly connected to the front end of the inner tube and the inside of the air outlet cover, respectively. The air outlet cover has a plurality of first air outlets arranged in a circular array. The control board is electrically connected to the heating element.

3. The dual-duct blower according to claim 2, characterized in that, The outer wall of the heat insulation cylinder is provided with a plurality of first supporting ribs arranged in a ring. The first supporting ribs are used to press against the inner wall of the front cylinder to form a first air cavity channel. The outer wall of the inner cylinder is provided with a plurality of second supporting ribs arranged in a ring. The second supporting ribs are used to press against the inner wall of the outer cylinder to form a second air cavity channel. The first air cavity channel and the second air cavity channel are connected.

4. The dual-duct blower according to claim 3, characterized in that, The front end face of the front cylinder is provided with a plurality of second air outlets in a circular array. The front end face of the front cylinder is provided with an assembly hole at the center. The air outlet cover is snapped into the assembly hole, and the first air outlet and the second air outlet are flush.

5. The dual-duct blower according to claim 2, characterized in that, The outer cylinder is fully covered by a fan housing. The front end of the fan housing is connected to the front cylinder. The rear part of the fan housing is provided with several first air inlets, which are located behind the main motor. The lower part of the fan housing is provided with several second air inlets, which are located below the auxiliary motor.

6. The dual-duct blower according to claim 5, characterized in that, The upper part of the outer cylinder is provided with a first circuit board, and the fan housing is provided with a number of first buttons at the corresponding positions of the first circuit board. The first buttons are connected to the first circuit board, and the first circuit board is used to adjust the speed of the main motor.

7. The dual-duct blower according to claim 5, characterized in that, A second circuit board is provided on the lower front side of the outer cylinder, and a second button is provided on the fan housing at the corresponding position of the second circuit board. The second button is connected to the second circuit board, and the second circuit board is used to start or stop the auxiliary motor.

8. The dual-duct blower according to claim 6 or 7, characterized in that, A power board is provided on the lower inner side of the fan casing, and the power board is electrically connected to the control board, the first circuit board, and the second circuit board.

9. The dual-duct blower according to claim 8, characterized in that, The bottom of the fan casing is equipped with a fan power cord, which is electrically connected to the power board.

10. The dual-duct blower according to claim 9, characterized in that, The bottom inner side of the fan casing is provided with a pressure line, which is used to press the power cord to prevent it from falling off.

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