Backpack type hair dryer

Abstract

The utility model provides a backpack type hair dryer which comprises a back plate, a blowing assembly and a power supply assembly, the back plate is provided with an assembling groove, the blowing assembly is assembled in the assembling groove, and the power supply assembly is assembled on the back plate and located above the blowing assembly to supply power to the blowing assembly. The air blowing assembly comprises a shell, fan blades and a motor, at least part of the shell is assembled in the assembling groove, the shell is provided with an air inlet and an air outlet, and the fan blades are contained in the shell and located at the air inlet; the motor is contained in the shell and connected with the fan blades so as to drive the fan blades to rotate and drive external airflow to enter from the air inlet. The fan blade comprises a base and a blade body, the blade body is arranged on the base and spirally extends towards the air inlet from the center of the base, the blade body is provided with a first edge connected with the base, the first edge is vertically arranged on the base and is close to the axis of the base, and the included angle between the extending direction of the first edge and the axial direction of the base is smaller than or equal to 80 degrees. Compared with the prior art, the backpack type hair dryer can output higher thrust at a low rotating speed, and noise can be reduced.

Description

Technical Field

[0001] The utility model relates to a backpack blower, belonging to the technical field of gardening tools. Background Art

[0002] Existing lithium battery blowers are generally axial flow blowers. In order to achieve higher thrust output, higher rotational speeds are usually required for matching, resulting in higher noise and serious heating of the motor. In addition, with the continuous improvement of market demand, it is difficult for axial flow blowers to achieve higher performance.

[0003] In view of this, it is necessary to propose a new type of backpack blower to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a backpack blower that can output higher thrust at a lower rotational speed, and at the same time, the low rotational speed means low noise.

[0005] To achieve the above purpose, the utility model provides a backpack blower, including:

[0006] A back panel provided with an assembly groove;

[0007] A blowing assembly assembled in the assembly groove;

[0008] A power supply assembly assembled on the back panel and located above the blowing assembly to supply power to the blowing assembly;

[0009] Wherein, the blowing assembly includes:

[0010] A housing at least partially assembled in the assembly groove, the housing having an air inlet and an air outlet;

[0011] A wind blade received in the housing and located at the air inlet;

[0012] A motor received in the housing and connected to the wind blade to drive the wind blade to rotate, driving external air flow to enter from the air inlet;

[0013] Wherein, the wind blade includes a base and blades, the blades are arranged on the base and spirally extend from the center of the base towards the air inlet, the blades have a first side connected to the base, the first side is erected on the base and is arranged close to the axis of the base, and the extension direction of the first side forms an angle less than or equal to 80° with the axial direction of the base.

[0014] As a further improvement of the present utility model, the blade further has a second side and a third side connected to the base. The second side is erected on the base and is disposed away from the axis of the base. The two ends of the third side are respectively connected to the first side and the second side, and the extending direction of the third side forms an angle less than 90° with the axial direction of the base.

[0015] As a further improvement of the present utility model, the housing includes an air inlet pipe, an air outlet pipe, and a bent pipe connecting the air inlet pipe and the air outlet pipe. The air inlet pipe is assembled in the assembly groove, the air inlet is provided on the air inlet pipe, the air outlet is provided on the air outlet pipe, and the extending direction of the air inlet pipe is substantially perpendicular to the extending direction of the air outlet pipe.

[0016] As a further improvement of the present utility model, a first air flow channel and a second air flow channel are provided in the blowing assembly. The second air flow channel penetrates through the motor, and the first air flow channel surrounds the outer periphery of the second air flow channel. When the motor rotates, external air flow enters the housing from the air inlet, and a part of it flows toward the air outlet along the first air flow channel, and a part of it flows through the motor along the second air flow channel and toward the air outlet.

[0017] As a further improvement of the present utility model, an upper duct and a lower duct are connected between the air inlet pipe and the air outlet pipe. The upper duct has a first channel communicating with the first air flow channel and a second channel communicating with the second air flow channel. The first channel is formed on the outer periphery of the second channel.

[0018] As a further improvement of the present utility model, the lower duct includes a lower duct housing and guide vanes received in the lower duct housing. The guide vanes are provided with fan blades spirally extending toward the bent pipe. Flow channels are formed between adjacent two fan blades. The flow channels communicate with the first channel and jointly constitute the first air flow channel. A through hole communicating with the second channel is provided at the center of the guide vanes so that the air flow flowing out from the second channel flows into the bent pipe through the through hole.

[0019] As a further improvement of the present utility model, a second gap is provided between the upper duct and the wind blade. A part of the external air flow enters the first air flow channel from the first channel, and another part enters the second channel from the gap and circulates in the second air flow channel through the second channel.

[0020] As a further improvement of the present invention, the air inlet duct includes an air guide portion and an upper cover connected to the air guide portion, the air inlet is formed on the air guide portion, one end of the upper cover is connected to the side of the air guide portion away from the air inlet, and the other end is connected to the upper duct, the fan blade is assembled inside the upper cover, and when the fan blade rotates, external air enters from the air inlet and flows into the upper cover after passing through the air guide portion.

[0021] As a further improvement of the present invention, the air guide portion is arranged in a cone shape that gradually contracts toward the air outlet, and the upper cover is arranged in a cone shape that gradually contracts toward the air inlet, so as to form a first recess at the connection between the air guide portion and the upper cover; the outer diameter of the lower duct close to the upper duct is larger than the outer diameter close to the elbow, so as to form a second recess on the outer periphery of the lower duct, and the two sides of the bottom of the power supply assembly protrude into the first recess and the second recess respectively.

[0022] As a further improvement of the present invention, in the flow direction of the airflow, the air inlet pipe, the upper duct and the lower duct together form a structure that is first concave, then convex, and then concave again, and the power supply component at least partially extends into the concave area.

[0023] The beneficial effects of the utility model are as follows: the backpack hair dryer of the utility model sets the blades of the fan blades on the base and extends them spirally from the center of the base, so that the airflow flows in the axial and radial directions to form a mixed flow, and at the same time, the first edge of the blade is set to have an angle less than or equal to 80° with the axial direction of the base, thereby increasing the air intake volume, achieving higher thrust output at low speed, and reducing noise, while enhancing the heat dissipation effect of the motor and improving operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a backpack hair dryer that conforms to the preferred embodiment of the utility model.

[0025] Figure 2 yes Figure 1 Exploded view of a backpack hair dryer shown.

[0026] Figure 3 yes Figure 1 A cross-sectional view of a backpack hair dryer is shown.

[0027] Figure 4 yes Figure 1 Cross-sectional view of the central blowing assembly.

[0028] Figure 5 yes Figure 2 Exploded view of the center guide vane, upper duct, motor and fan blades.

[0029] Figure 6 yesFigure 4 The air flow direction in the first air flow channel.

[0030] Figure 7 is Figure 4 The air flow direction in the second air flow channel.

[0031] Figure 8 is Figure 5 The structural schematic diagram of another embodiment of the wind blade.

[0032] Figure 9 is Figure 8 The structural schematic diagram of another angle of the wind blade. Detailed implementation manners

[0033] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to Figures 1 to 3 As shown, the present utility model discloses a backpack blower 100 for backpack use. The backpack blower 100 includes a blowing assembly 1, a power supply assembly 7 and a back plate 4. One side surface of the back plate 4 is used for fitting against the user's back for the user to carry on the back, and the other side surface is provided with an assembly groove 40. One end of the blowing assembly 1 is assembled in the assembly groove 40, and the other end is located outside the back plate 4 for blowing air outward; the power supply assembly 7 is assembled on the back plate 4 and is located above the blowing assembly 1 to supply power to the blowing assembly 1.

[0035] Preferably, the extension surface of the back plate 4 is perpendicular to the plane where the blowing assembly 1 is located, that is, the back plate 4 extends along a vertical plane, and the blowing assembly 1 extends along a horizontal plane, so as to achieve the blowing effect on the front while expanding the contact surface with the user as much as possible to ensure firm fixation.

[0036] The power supply assembly 7 includes a power supply cavity 71 and a power supply cover 72. The power supply cavity 71 is fixedly connected to the back plate 4, and a power supply chamber 70 for accommodating a battery pack (not shown) is provided in the power supply cavity 71. The power supply cover 72 is used to close the power supply chamber 70.

[0037] The backpack blower 100 further includes a bracket 8 for fixing the blowing assembly 1 and the back plate 4. The assembly groove 40 is a U-shaped groove. After the blowing assembly 1 is assembled in the assembly groove 40 of the back plate 4, at least a part of the blowing assembly 1 is restricted in the assembly groove 40 by the bracket 8. Preferably, the bracket 8 is a metal bracket to enhance the structural strength of the back plate 4.

[0038] The blowing assembly 1 includes a housing 10 and a fan assembly accommodated in the housing 10. The housing 10 is at least partially assembled in the assembly groove 40 and includes an air inlet pipe 11, a curved pipe 15, an air outlet pipe 14, and a flexible pipe 16 connecting the curved pipe 15 and the air outlet pipe 14. The air inlet pipe 11 is assembled in the assembly groove 40, and the extension direction of the air inlet pipe 11 is substantially perpendicular to the extension direction of the air outlet pipe 14. By providing the flexible pipe 16, the blowing direction can be adjusted according to actual needs, and the blowing area can be expanded.

[0039] The shell 10 has an air inlet 111 and an air outlet 141. The air inlet 111 is arranged on the air inlet pipe 11, and the air outlet 141 is arranged on the air outlet pipe 14. The fan assembly is located at the air inlet 111, so that it can drive external airflow from the air inlet 111 into the interior of the shell 10 during operation.

[0040] In this embodiment, the air inlet pipe 11 includes an air guide portion 112 and an upper cover 113 connected to the air guide portion 112, the air inlet 111 is formed on the air guide portion 112, one end of the upper cover 113 is connected to the side of the air guide portion 112 away from the air inlet 111, and the other end is connected to the upper duct 12, the fan blade 30 is assembled inside the upper cover 113, when the fan blade 30 rotates, the external airflow enters from the air inlet 111, and flows into the upper cover 113 after passing through the air guide portion 112.

[0041] In this embodiment, the air inlet duct 11 further includes a fixing seat 117 for supporting and fixing the air guide portion 112. The fixing seat 117 is used to fix the air guide portion 112 to the upper cover 113, and can also increase the structural strength of the air guide portion 112. Of course, in other embodiments, the fixing seat 117 may not be provided, and the air guide portion 112 may be directly made of a material with a higher structural strength. In this case, the air guide portion 112 may be directly fixedly connected to the upper cover 113, which is not limited here.

[0042] The air inlet pipe 11 further includes a mesh cover assembly 114. The mesh cover assembly 114 is connected to one side of the air inlet 111 of the air guiding part 112. The other end of the air guiding part 112 is fixedly connected to the upper cover 113. The filter screen 1141 on the mesh cover assembly 114 can filter the inflowing external air flow. Preferably, in this embodiment, the mesh cover assembly 114 is assembled by a filter screen 1141 and a filter screen fixing seat 1142. The filter screen 1141 is used to filter the external air flow to make the air flow entering the blowing assembly 1 cleaner. The filter screen fixing seat 1142 is used to fix the filter screen 1141 so that the filter screen 1141 is limited between the filter screen fixing seat 1142 and the air guiding part 112. Of course, in other embodiments, the filter screen 1141 and the filter screen fixing seat 1142 can also be integrally provided, as long as they can be fixed to the air guiding part 112 and play a filtering role, and there is no limitation here.

[0043] At least a part of the elbow pipe 15 is located outside the back plate 4, so that the air outlet pipe 14 is also located outside the back plate 4. The air outlet pipe 14 preferably extends horizontally on the side of the back plate 4, which can make the air outlet pipe 14 near the user's hand and is more convenient to use.

[0044] In this embodiment, the backpack blower 100 further includes a handle assembly 6 provided on the air outlet pipe 14. The handle assembly 6 can be held by an operator to adjust the blowing direction. The vertical distance between the handle assembly 6 and the back plate 4 should consider the habitual distance when a person stretches out his hand, so as to be more conducive to the operator's use. Of course, several control switches can also be provided on the handle assembly 6 to control the start and stop of the blowing assembly 1 and the wind speed, etc.

[0045] The fan assembly includes a wind blade 30 and a motor 20 connected to the wind blade 30. The housing 10 is penetrated along its axial direction. The motor 20 is configured to drive the wind blade 30 to rotate to generate an air flow flowing through the housing 10.

[0046] The wind blade 30 and the motor 20 are received in the housing 10 and are located between the air inlet 111 and the air outlet 141; preferably, the wind blade 30 is located at the air inlet 111. An upper duct 12 and a lower duct 13 are connected between the air inlet pipe 11 and the air outlet pipe 14, and the upper duct 12 is connected to the air inlet pipe 11, and the lower duct 13 is connected to the air outlet pipe 14.

[0047] In particular, the upper duct 12 is arranged in a conical shape that gradually contracts towards the air inlet 111, and the lower duct 13 is arranged in a conical shape that gradually contracts towards the air outlet 141. With such an arrangement, the air flow can be directed into the axial direction. In other words, the external air flow enters parallel along the axial direction from the air inlet 111. After the wind blade 30 rotates, the air flow flows around in all directions at a certain angle with the axial direction along the upper duct 12, and then returns to flow out parallel to the axial direction along the lower duct 13, achieving the guidance of the air flow direction.

[0048] Preferably, in the air flow direction, the air inlet pipe 11, the upper duct 12, and the lower duct 13 together form a structure that first depresses, then bulges, and then depresses again, and at least part of the power supply assembly extends into the depressed area. With such an arrangement, the structure of the backpack blower 100 is made more compact.

[0049] Specifically, the air guiding part 112 is arranged in a conical shape that gradually contracts towards the air outlet 141, and the upper cover 113 is arranged in a conical shape that gradually contracts towards the air inlet 111, so that a first depression 115 can be formed at the connection between the air guiding part 112 and the upper cover 113; the outer diameter of the lower duct 13 on the side close to the upper duct 12 is larger than the outer diameter on the side close to the air outlet pipe 14, so that a second depression 116 can be formed on the outer circumference of the lower duct 13. The first depression 115 and the second depression 116 can allow other components to extend into them, thereby making the structure of the backpack blower 100 more compact.

[0050] The minimum diameter of the air inlet pipe 11 is smaller than the diameter of the air inlet 111, that is, the inner part of the entrance of the air inlet pipe 11 is partially depressed inward to increase the air intake volume.

[0051] In particular, there is a first gap 101 between the outer edge of the wind blade 30 and the inner wall surface of the air inlet pipe 11, so that the minimum distance between the outer edge of the wind blade 30 and the inner wall surface of the air inlet pipe 11 is between 0.3 - 3 mm.

[0052] Please refer to Figure 4 and Figure 7 As shown, to further enhance the air flow rate and dissipate heat from the motor 20, a first air flow channel 103 and a second air flow channel 104 are provided in the backpack blower 100. The second air flow channel 104 passes through the motor 20, so that the air flow flowing into the second air flow channel 104 can dissipate heat from the motor 20.

[0053] It can be understood that since the motor 20 must be disposed at the axial center position of the housing 10, the second air flow channel 104 extends along the axis of the housing 10, and the first air flow channel 103 is formed around the outer periphery of the second air flow channel 104. Thus, when the motor 20 rotates, the external air flow can enter the housing 10 from the air inlet 111, and a part of it flows toward the air outlet 141 along the first air flow channel 103, and a part of it flows through the motor 20 along the second air flow channel 104 toward the air outlet 141 to take away the heat on the motor 20.

[0054] The upper duct 12 has a first channel 121 communicating with the first air flow channel 103 and a second channel 122 communicating with the second air flow channel 104, and the first channel 121 is formed on the outer periphery of the second channel 122. In other words, the first channel 121 is a first opening formed at the outer edge of the upper duct 12, and this first opening penetrates both sides of the upper duct 12, so that the internal space of the air inlet pipe 11 can communicate with the internal space of the lower duct 13; the second channel 122 is a second opening formed at the middle position of the upper duct 12, and this second opening penetrates both sides of the upper duct 12, so that the internal space of the air inlet pipe 11 can communicate with the space where the motor 20 is located. Thus, the air flow flowing in from the air inlet 111 can be divided into two parts, flowing out from the first channel 121 and the second channel 122 respectively and then flowing into the lower duct 13.

[0055] Preferably, the ratio of the radial length of the first air flow channel 103 in the upper duct 12 to the outer diameter of the fan blade 30 is greater than 0.05, and the ratio of the diameter of the air outlet 141 to the outer diameter of the fan blade 30 is greater than 0.15, which is not only beneficial to air intake but also can ensure stable air speed.

[0056] Preferably, there is a second gap 102 between the upper duct 12 and the fan blade 30, so that the distance between the fan blade 30 and the upper duct 12 is greater than or equal to 2 mm. A part of the external air flow flowing into the air inlet pipe 11 enters the first air flow channel 103 from the first channel 121, and another part enters the second channel 122 from the second gap 102 and circulates in the second air flow channel 104 through the second channel 122. Of course, in other embodiments, the first channel 121 and the second channel 122 can also be separated by setting a connecting member, and no limitation is made thereto.

[0057] The lower duct 13 includes a lower duct housing 130 fixedly connected to the upper duct 12 and guide vanes 131 housed in the lower duct housing 130. The guide vanes 131 are provided with fan blades 132 spirally extending towards the air outlet 141. Flow channels are formed between adjacent two fan blades 132. The flow channels are communicated with the first channel 121 and jointly constitute the first air flow channel 103.

[0058] A through hole 133 is provided at the center of the guide vane 131, and the through hole 133 is communicated with the second channel 122.

[0059] A flow guiding cone 22 is further provided in the lower duct 13 and is arranged towards the elbow 15. The radius of the flow guiding cone 22 gradually decreases along the air flow direction of the second air flow channel 104. The flow guiding cone 22 is provided with an opening 221 for air to flow out. The air flowing in the first air flow channel 103 flows along the outer periphery of the flow guiding cone 22 towards the air outlet 141. The second channel 122, the through hole 133 and the opening 221 are sequentially communicated to jointly constitute the second air flow channel 104. The first air flow channel 103 and the second air flow channel 104 are communicated at the opening 221.

[0060] The fan blade 30 is a mixed-flow fan blade. The fan blade 30 includes a base 31 and blades 32 spirally extending from the center of the base 31. Preferably, 6 blades 32 are provided. A pivot hole 35 is provided at the axis center of the base 31, and the motor 20 passes through the pivot hole 35 to drive the base 31 to rotate.

[0061] Preferably, the blade 32 has a first side 321, a second side 322 and a third side 323 connected to the base 31. The blade 32 extends towards the air inlet 111, that is, both the first side 321 and the second side 322 extend towards the air inlet 111. The first side 321 is erected on the base 31 and is arranged close to the axis center of the base 31. The second side 322 is also erected on the base 31 and is arranged away from the axis center of the base 31. Both ends of the third side 323 are respectively connected to the first side 321 and the second side 322. The included angle between the extending direction of the first side 321 and the axial direction of the base 31 is less than or equal to 80°, so that an inward concave space is formed at the air inlet 111, which is beneficial to increasing the air intake. The included angle between the extending direction of the third side 323 and the axial direction of the base 31 is less than 90°, so as to guide the air flow to the air outlet pipe 14 under the action of the housing 10 and the lower duct 13.

[0062] Please combine Figure 8 and Figure 9As shown, in other embodiments, the base 31 is further provided with air passing holes 33 located between two adjacent blades 32. That is, there are also 6 air passing holes 33, which are arranged close to the axis of the wind blade 30. The opening direction of the air passing holes 33 is parallel to the axial direction of the wind blade 30 and is used to communicate the air inlet 111 and the second channel 122.

[0063] That is to say, in this embodiment, the second air flow channel 104 is formed by the air passing holes 33, the second channel 122, the through hole 133 and the guide cone 22. The extending direction of the second air flow channel 104 is parallel to the axial direction of the wind blade 30. Thus, a part of the air flow flowing into the air inlet pipe 11 enters the flow channel formed on the outer peripheral wall of the guide vane 131 through the first channel 121, and a part of the air flow flows in through the air passing holes 33, enters the guide vane 131 and the guide cone 22 through the second channel 122, and finally flows toward the air outlet 141.

[0064] The wind blade 30 further includes an extension edge 34 extending toward the upper duct 12. The extension edge 34 surrounds the base 31 and extends away from the blade 32. The orthographic projection of the extension edge 34 on the upper duct 12 partially overlaps with the upper duct 12, so that the extension edge 34 extends into the upper duct 12 and is connected to the stop of the upper duct 12. Since the upper duct 12 is fixed and does not rotate, the wind blade 30 can rotate relative to the upper duct 12. Therefore, the extension edge 34 can be used to prevent the air flow from flowing into the second air flow channel 104 along the gap between the wind blade 30 and the upper duct 12.

[0065] In summary, the backpack hair dryer 100 of the present invention adopts a mixed-flow wind blade. The external air flow enters parallel to the axial direction from the air inlet 111. After the wind blade 30 rotates, the air flow flows around at a certain angle with the axial direction along the upper duct 12, and then returns to flow out parallel to the axial direction along the lower duct 13, realizing the guiding of the air flow direction. That is, the mixed-flow wind blade 30 of the present invention enables the air flow passing through it to have both an axial component and a radial component. In addition, on the one hand, by setting the first side 321 of the blade 32 to form an angle less than or equal to 80° with the axial direction of the base 31, and on the other hand, by setting the first air flow channel 103 and the second air flow channel 104, when the motor 20 rotates, a part of the external air flow entering from the air inlet 111 can flow toward the air outlet 141 along the first air flow channel 103, and a part of the air flow can flow through the motor 20 toward the air outlet 141 along the second air flow channel 104 to take away the heat on the motor 20. Compared with the prior art, the present invention can achieve higher thrust output at low rotational speed, reduce noise, enhance the heat dissipation effect of the motor 20, and improve the operation efficiency.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A backpack hair dryer, characterized in that: include: A back plate, provided with a mounting groove; A blowing assembly, assembled in the assembly groove; A power supply assembly is mounted on the back plate and is located above the blowing assembly to supply power to the blowing assembly; Wherein, the blowing component comprises: A shell, at least partially assembled in the assembly groove, the shell having an air inlet and an air outlet; A fan blade, housed in the housing and located at the air inlet; A motor is housed in the housing and connected to the fan blades to drive the fan blades to rotate and drive external airflow to enter from the air inlet; Among them, the fan blade includes a base and a blade, the blade is arranged on the base and spirally extends from the center of the base toward the air inlet, the blade has a first edge connected to the base, the first edge is upright on the base and is arranged close to the axis of the base, and the angle between the extension direction of the first edge and the axial direction of the base is less than or equal to 80°.

2. The backpack hair dryer according to claim 1, characterized in that: The blade also has a second side and a third side connected to the base, the second side is erected on the base and arranged away from the axis of the base, the two ends of the third side are respectively connected to the first side and the second side, and the angle between the extension direction of the third side and the axial direction of the base is less than 90°.

3. The backpack hair dryer according to claim 1, characterized in that: The shell includes an air inlet pipe, an air outlet pipe and a bent pipe connecting the air inlet pipe and the air outlet pipe, the air inlet pipe is assembled in the assembly groove, the air inlet is arranged on the air inlet pipe, the air outlet is arranged on the air outlet pipe, and the extension direction of the air inlet pipe is approximately perpendicular to the extension direction of the air outlet pipe.

4. The backpack hair dryer according to claim 3, characterized in that: The blowing assembly is provided with a first air flow channel and a second air flow channel, the second air flow channel runs through the motor, and the first air flow channel surrounds the outer circumference of the second air flow channel. When the motor rotates, external air flow enters the shell from the air inlet, and a part of it flows along the first air flow channel toward the air outlet, and a part of it flows along the second air flow channel through the motor toward the air outlet.

5. The backpack hair dryer according to claim 4, characterized in that: An upper duct and a lower duct connected to each other are provided between the air inlet pipe and the air outlet pipe. The upper duct has a first channel connected to the first air flow channel and a second channel connected to the second air flow channel. The first channel is formed on the periphery of the second channel.

6. The backpack hair dryer according to claim 5, characterized in that: The lower duct includes a lower duct shell and a guide vane accommodated in the lower duct shell. The guide vane is provided with a blade extending spirally toward the curved pipe. A flow channel is formed between two adjacent blades. The flow channel is connected with the first channel and together constitutes the first airflow channel. A through hole connected to the second channel is provided at the center of the guide vane so that the airflow flowing out of the second channel can flow into the curved pipe after passing through the through hole.

7. The backpack hair dryer according to claim 5, characterized in that: A second gap is provided between the upper duct and the fan blade. A portion of the external airflow enters the first airflow channel from the first channel, and another portion enters the second channel from the second gap and flows in the second airflow channel through the second channel.

8. The backpack hair dryer according to claim 5, characterized in that: The air inlet duct includes an air guide portion and an upper cover connected to the air guide portion, the air inlet is formed on the air guide portion, one end of the upper cover is connected to the side of the air guide portion facing away from the air inlet, and the other end is connected to the upper duct, the fan blade is assembled inside the upper cover, when the fan blade rotates, external air enters from the air inlet and flows into the upper cover after passing through the air guide portion.

9. The backpack hair dryer according to claim 8, characterized in that: The air guide portion is set in a cone shape that gradually shrinks toward the air outlet, and the upper cover is set in a cone shape that gradually shrinks toward the air inlet, so as to form a first recess at the connection between the air guide portion and the upper cover; the outer diameter of the lower duct close to the upper duct is larger than the outer diameter close to the elbow, so as to form a second recess on the outer periphery of the lower duct, and the two sides of the bottom of the power supply assembly protrude into the first recess and the second recess respectively.

10. The backpack hair dryer according to claim 5, characterized in that: In the flow direction of the airflow, the air inlet pipe, the upper duct and the lower duct together form a structure that is first concave, then convex, and then concave again, and the power supply component at least partially extends into the concave area.

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