Handheld air duct

Abstract

The handheld air duct comprises a shell, a draught fan assembly, a heating assembly, a control circuit and an induction assembly, the shell comprises an air duct part and a handheld part connected to the side face of the air duct part, the air duct part is provided with an air duct and an installation cavity, and the installation cavity is located on the radial outer side of the air duct. An air outlet communicated with the air duct is further formed in one end of the air duct part; the fan assembly is arranged in the air duct and used for driving air to flow to the air outlet through the air duct; the heating assembly is arranged in the air duct; the control circuit is arranged in the shell, and the control circuit is electrically connected with the fan assembly and the heating assembly and used for controlling the fan assembly and the heating assembly; the sensing assembly is arranged in the mounting cavity and electrically connected with the control circuit. According to the technical scheme, the handheld air duct has the advantage that the internal structure of the air supply channel is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of hair dryers, in particular to a handheld hair dryer. Background Art

[0002] Handheld hair dryers are a common personal care device, widely used in daily life. To meet user demands for compact size and diverse functionality, the internal structural design of handheld hair dryers has gradually evolved towards miniaturization and integration. However, due to the need to accommodate the blower assembly, heating components, various control circuits, and sensing components within the handheld hair dryer, the space within the air supply duct is very limited, resulting in significant restrictions on the layout of related circuit components. Utility Model Content

[0003] The main purpose of the utility model is to provide a handheld hair dryer, aiming to solve the problems of compact structure and limited layout of circuit components in the air supply channel of the handheld hair dryer.

[0004] To achieve the above-mentioned purpose, the handheld hair dryer proposed by the present invention includes a housing, a fan assembly, a heating assembly, a control circuit and a sensing assembly, wherein:

[0005] The housing includes an air duct portion and a handheld portion connected to the side of the air duct portion. The air duct portion is provided with an air duct and a mounting cavity. The mounting cavity is located radially outside the air duct. One end of the air duct portion is also provided with an air outlet connected to the air duct.

[0006] The fan assembly is arranged in the air duct, and is used to drive the air to flow through the air duct to the air outlet;

[0007] The heating component is arranged in the air duct;

[0008] A control circuit is provided in the housing, the control circuit is electrically connected to the fan assembly and the heating assembly, and is used to control the fan assembly and the heating assembly;

[0009] The sensing component is arranged in the installation cavity and is electrically connected to the control circuit.

[0010] In one embodiment, the installation cavity and the air duct are separated by a separation structure.

[0011] In one embodiment, the installation cavity is provided at one end of the air duct portion.

[0012] In one embodiment, the housing includes an air duct housing, and a portion of the air duct housing corresponding to the installation cavity is gradually raised.

[0013] In one embodiment, the handheld portion is foldably connected to the air duct portion. When the handheld portion is in a folded state, the mounting cavity is located on a side of the air duct portion facing away from the handheld portion.

[0014] In one embodiment, the sensing component includes at least one of a displacement sensor, a temperature sensor, and a distance sensor.

[0015] In one embodiment, the air duct portion is further provided with a sensing window communicating with the installation cavity, and a sensing side of the temperature sensor and / or the distance sensor faces the sensing window.

[0016] In one embodiment, the sensing window and the air outlet are both provided on an end surface of the same end of the air duct portion, and the sensing window and the air outlet are spaced apart.

[0017] In one embodiment, the sensing component further includes a circuit board, which faces the sensing window. The temperature sensor, distance sensor and / or displacement sensor of the sensing component are installed on a side of the circuit board facing the sensing window.

[0018] The handheld hair dryer of the present invention utilizes a mounting cavity radially outside the air duct and positions the sensor assembly within this cavity. This allows for spatial isolation of the sensor assembly from functional components such as the fan assembly and the heating assembly, avoiding spatial conflicts between these components. This effectively addresses the issues of compact internal air duct space and limited circuit assembly, thereby optimizing the overall structural design of the hair dryer. Furthermore, separating the sensor assembly from the air duct facilitates smoother air flow within the duct, improving the overall air delivery efficiency of the hair dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a structural diagram of an embodiment of the handheld hair dryer of the present utility model;

[0021] Figure 2 This is a cross-sectional view of the handheld hairdryer of the present invention in an unfolded state;

[0022] Figure 3 This is a structural diagram of the handheld hairdryer of the utility model when the handheld portion is folded;

[0023] Figure 4This is a cross-sectional view of the handheld hairdryer of the present invention in a folded state;

[0024] Figure 5 for Figure 4 It is a local enlarged view of point A;

[0025] Figure 6 This is a structural diagram of the air outlet of the handheld portion of the handheld hairdryer of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the sensing component in the handheld hair dryer of the present invention.

[0027] Icon number description:

[0028] 11. Air duct unit; 11a. Air duct unit housing; 11b. Connecting unit; 12. Air duct; 12a. Air outlet; 12b. Air inlet; 12c. Sensor window; 13. Mounting cavity; 15. Handheld unit; 20. Fan assembly; 30. Heating assembly; 40. Control circuit; 41. Control module; 50. Sensor assembly; 51. Displacement sensor; 52. Temperature sensor; 53. Distance sensor; 54. Circuit board; 60. Rotating shaft structure; 61. First rotating shaft base; 62. Second rotating shaft base; 63. Wire hole

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution in which both A and B are satisfied. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The utility model provides a handheld hair dryer.

[0034] In the embodiment of the present utility model, Figures 1 to 7 As shown, the handheld hairdryer includes a housing, a blower assembly 20 , a heating assembly 30 , a control circuit 40 and a sensing assembly 50 .

[0035] Specifically, the shell includes an air duct portion 11 and a hand-held portion 15 connected to the side of the air duct portion 11. The air duct portion 11 is provided with an air duct 12 and an installation cavity 13. The installation cavity 13 is located radially outside the air duct 12. One end of the air duct portion 11 is also provided with an air outlet 12a connected to the air duct 12. The air outlet 12a can be formed on the side of the air duct portion 11, or on the end face of the air duct portion 11, or air outlets 12a can be provided on both the side and the end face of the air duct portion 11.

[0036] Furthermore, in this embodiment, the other end of the air duct portion 11 is further provided with an air inlet 12b that communicates with the air duct 12. Similar to the arrangement of the air outlet 12a, the air inlet 12b can be provided on the end face, side face, or both the side face and end face of the air duct portion 11.

[0037] That is, the air inlet 12b and the air outlet 12a are located at the two ends of the air duct portion 11, respectively. In this way, the air inlet and outlet directions are distributed axially, which helps to form a stable and continuous airflow path, reduces airflow turbulence in the air duct 12, and thus improves the flow efficiency of the airflow and the overall air supply effect. Of course, in other embodiments, the air inlet 12b connected to the air duct 12 can also be provided on the handle portion of the housing.

[0038] The control circuit 40 is provided in the housing and is used to control the operation of the handheld hair dryer. The control circuit 40 is electrically connected to the fan assembly 20, the heating assembly 30 and the sensing assembly 50 respectively, thereby realizing coordinated control of each assembly to realize the blowing operation of the handheld hair dryer.

[0039] Optionally, the control circuit 40 includes a control module 41 and a connecting line, wherein the control module 41 is composed of a plurality of functional modules to realize the control and safety protection functions of different working modes of the handheld hair dryer. For example, the control module 41 may include a main control unit, a drive module, an adjustment module, an induction signal processing module and other modules. The specific structure and circuit of the control module 41 can refer to the existing handheld hair dryers and are not described here. The connecting line is used to connect the control module 41 with the fan assembly 20, the heating assembly 30 and the induction assembly 50 to realize the transmission of electrical signals. The connecting line can be a wire or a flexible PCB. Specifically, the fan assembly 20 is arranged in the air duct 12 and is used to drive air through the air duct 12 to the air outlet 12a. The fan assembly 20 is electrically connected to the control circuit 40 to receive the start-stop and adjustment signals issued by the control circuit 40, thereby adjusting the speed of the fan assembly 20 and its working state.

[0040] The heating component 30 is arranged in the air duct 12 and is electrically connected to the control circuit 40. The heating component 30 is used to heat the air in the air duct 12, thereby realizing the function of blowing hot air to the outside. In this embodiment, the heating component 30 is configured to use a ceramic heating element to heat the air. The use of a ceramic heating element can not only increase and reduce the volume of the heating component 30, but also effectively improve the heating efficiency of the heating component 30. Of course, the design of the present application is not limited to this. In other embodiments, the heating component 30 can also use an electric heating wire to heat the air.

[0041] The sensing component 50 is used to detect the working status of the handheld hair dryer and its interaction with the external environment in real time, and convert the detection results into corresponding signals and transmit them to the control circuit 40. The control circuit 40 can then adjust and control the fan component 20 and the heating component 30 accordingly based on these sensing signals, thereby realizing intelligent control of the handheld hair dryer.

[0042] In this embodiment, the sensing component 50 is disposed in the mounting cavity 13. Specifically, the sensing component 50 includes a displacement sensor 51, a temperature sensor 52, and a distance sensor 53, which are used to detect the working status of the handheld hairdryer and its interaction with the external environment in real time, and convert the detection results into corresponding signals and transmit them to the control circuit 40.

[0043] Specifically, the displacement sensor 51 is used to detect the displacement change or tilt angle of the handheld hairdryer and send a corresponding displacement signal to the control circuit 40. The control circuit 40 can determine the current state of the handheld hairdryer based on the displacement signal and perform corresponding operation control. For example:

[0044] When the control circuit 40 detects that the handheld hair dryer is placed on the desktop in the working state, the control circuit 40 will stop or pause the operation of the hair dryer, thereby avoiding unnecessary energy consumption caused by the continuous operation of the handheld hair dryer when no one is operating it.

[0045] Correspondingly, when the handheld hair dryer is in a paused state, if the displacement sensor 51 detects that the handheld hair dryer is picked up by the user, the control circuit 40 can restore the hair dryer to the working state before the pause, or resume working according to the preset working conditions, thereby improving the convenience of using the hair dryer and avoiding the inconvenience caused by frequent start and stop operations.

[0046] The temperature sensor 52 is used to detect the temperature of the object (usually the user's hair or scalp) in front of the handheld hair dryer outlet 12a and send a temperature signal to the control circuit 40. The control circuit 40 adjusts the working state of the fan assembly 20 and the heating assembly 30 in real time based on these temperature signals. For example:

[0047] When the temperature sensor 52 detects that the temperature of the user's hair is too high (the temperature is greater than the set temperature threshold), the control circuit 40 will automatically reduce the output power of the heating component 30 or stop the operation of the heating component 30, thereby preventing damage to the user's hair or scalp due to excessive temperature.

[0048] After the temperature drops to a set safety range, the control circuit 40 can resume the operation of the heating component 30, thereby ensuring that the hot air temperature output by the hair dryer is always within the user's acceptable range, effectively protecting the user's hair from the effects of excessive temperatures.

[0049] The distance sensor 53 is used to detect the distance between the handheld hairdryer and the object being blown (usually the user's hair or head), and sends a distance signal to the control circuit 40. The control circuit 40 adjusts the working state of the fan assembly 20 and the heating assembly 30 according to the distance signal. For example:

[0050] When the distance sensor 53 detects that the handheld hair dryer is too close to the user (the distance is less than the set safety distance threshold), the control circuit 40 will automatically reduce the output power of the heating component 30 or stop the operation of the heating component 30 to prevent the user from feeling uncomfortable or being burned due to the hair dryer being too close.

[0051] At the same time, the control circuit 40 can reduce the motor speed of the fan assembly 20, thereby reducing the phenomenon of excessive wind force caused by the hair dryer being too close, and improving the comfort of using the hair dryer.

[0052] When the distance between the handheld hairdryer and the user returns to a safe range, the control circuit 40 will restore the normal working state of the fan assembly 20 and the heating assembly 30, thereby ensuring the stability and safety of the hairdryer's working state.

[0053] Of course, the design of the present application is not limited thereto. In other embodiments, the sensing component 50 may also include at least one of the temperature sensor 52 , the distance sensor 53 , and the displacement sensor 51 , or may also include other sensors, such as a humidity sensor.

[0054] It is worth noting that the air duct 12 of the handheld hair dryer usually needs to accommodate a fan assembly 20 and a heating assembly 30, and both have high requirements for the spatial layout: the fan assembly 20 usually needs to be installed in the middle position of the air duct 12 to ensure that the driven airflow can pass smoothly through the air duct 12, and the heating assembly 30 should be installed downstream of the air duct 12 (that is, close to the air outlet 12a) to evenly heat the air.

[0055] The handheld hair dryer of the present invention provides a mounting cavity 13 radially outside the air duct 12 and positions the sensing assembly 50 within the mounting cavity 13. This allows the sensing assembly 50 to be spatially isolated from functional components such as the fan assembly 20 and the heating assembly 30, thereby avoiding spatial conflicts between the components. This effectively addresses the issues of compact interior space and limited circuit assembly layout within the air duct 12, thereby optimizing the overall structural design of the hair dryer. Furthermore, separating the sensing assembly 50 from the air duct 12 further facilitates smoother air flow within the duct 12, thereby enhancing the overall air delivery efficiency of the hair dryer.

[0056] In some embodiments, the installation cavity 13 and the air duct 12 are separated by a partition structure. Specifically, a partition structure is provided between the installation cavity 13 and the air duct 12 to effectively isolate the internal spaces of the two. This partition structure can be an independent partition or a fixed structure within the housing. It is typically made of a material with high heat resistance, insulation, and strength, such as engineering plastics, sheet metal, or composite materials.

[0057] This arrangement prevents the sensing assembly 50 within the mounting cavity 13 from being directly affected by the airflow and heat within the air duct 12, thereby improving the operating stability and overall service life of the sensing assembly 50. Furthermore, the partition structure effectively separates the mounting cavity 13 from the interior space of the air duct 12, providing a clearer layout between the sensing assembly 50 and the mechanical components within the air duct 12 (such as the fan assembly 20 and the heating assembly 30). This not only facilitates the fixing and assembly of the sensing assembly 50 but also reduces wiring complexity, thereby improving the assembly efficiency and stability of the overall structure.

[0058] In addition, during maintenance and inspection, the partition structure between the installation cavity 13 and the air duct 12 can form an independent modular design between the interior of the air duct 12 and the installation cavity 13, so that when inspecting or replacing the sensing component 50, there is no need to disassemble the mechanical components inside the air duct 12, thereby improving maintenance efficiency.

[0059] Of course, the design of the present application is not limited thereto. In other embodiments, the installation cavity 13 and the air duct 12 may also be connected to each other.

[0060] Alternatively, the partition structure may be formed by the air duct wall of the air duct 12, so that the internal space of the shell can be utilized to a greater extent, thereby facilitating the miniaturization design of the air duct.

[0061] In some embodiments, the mounting cavity 13 is provided at one end of the air duct portion 11 , which means that the mounting cavity 13 is located near the air inlet 12 b or the air outlet 12 a of the air duct 12 , for example, at the outer edge or end region of the air duct 12 .

[0062] This design, on the one hand, allows for better interaction between the sensing component 50 and the external environment, facilitating the detection and processing of sensing signals. On the other hand, the location of the mounting cavity 13 close to the exterior of the wind tube facilitates optimized heat dissipation, reduces component operating temperature, increases service life, and facilitates maintenance and repair.

[0063] In addition, arranging the installation cavity 13 at one end of the air duct portion 11 is also beneficial to simplifying the structural design of the shell, making it more coordinated and beautiful.

[0064] Of course, the design of the present application is not limited thereto. In other embodiments, the mounting cavity 13 may also be provided at other locations of the air duct portion 11 , such as the middle portion of the air duct portion 11 .

[0065] In some embodiments, the housing includes an outer shell of the air duct portion 11 , and a portion of the outer shell of the air duct portion 11 corresponding to the installation cavity 13 is gradually raised.

[0066] This design allows for a smooth transition within the housing of the air duct portion 11, resulting in a more coordinated and unified overall appearance. Furthermore, by gradually raising the housing of the air duct portion 11 at the mounting cavity 13, the internal volume is effectively increased, allowing the sensor assembly 50 to occupy more space within the raised portion, thereby avoiding spatial conflicts with the fan assembly 20 and heating assembly 30 within the air duct 12.

[0067] Moreover, only the portion of the air duct portion 11 shell corresponding to the installation cavity 13 gradually bulges, which can keep the structure of other portions of the air duct portion 11 shell unchanged, thereby ensuring that the volume of the handheld hair dryer is controllable.

[0068] Of course, the design of the present application is not limited thereto. In other embodiments, the outer shell of the air duct portion 11 may also be designed to be flat, without the need to bulge with respect to the installation cavity 13 .

[0069] In some embodiments, the handle 15 is foldably connected to the air duct portion 11. When the handle 15 is folded, the mounting cavity 13 is located on the side of the air duct portion 11 facing away from the handle 15. This prevents the mounting cavity 13 from overlapping or interfering with the handle 15 when the handle 15 is folded, thereby maintaining the compactness of the hair dryer's structure and the rationality of its component layout when folded. Furthermore, because the outer shell of the air duct portion 11 gradually bulges at the position corresponding to the mounting cavity 13, this bulge faces the handle 15 when the handle 15 is folded, thereby enhancing the overall appearance of the handheld hair dryer.

[0070] Of course, the design of the present application is not limited thereto. In other embodiments, the mounting cavity 13 may also be provided on the side of the air duct 12 facing the handheld portion 15 , or on the side of the air duct 12 adjacent to the handheld portion 15 .

[0071] In some embodiments, the air duct portion 11 includes a connecting portion 11b extending toward the hand-held portion 15. The connecting portion 11b is rotatably connected to the hand-held portion 15 via an embedded pivot structure 60. The pivot structure 60 includes a first pivot base 61 provided on the connecting portion 11b and a second pivot base 62 provided on the hand-held portion 15. The first pivot base 61 and the second pivot base 62 are rotatably engaged with each other, and the hand-held portion 15 rotates around the pivot structure 60 to unfold or fold relative to the air duct portion 11.

[0072] Specifically, the axis of the rotating shaft structure 60 is set at an angle to the extension line of the handle part. In this way, when the hand-held part 15 rotates around the rotating shaft structure 60, its end always moves along an arc trajectory with the rotating shaft structure 60 as the center.

[0073] Furthermore, a wire hole 63 is formed in the rotating shaft structure 60, and the control module 41 of the control circuit 40 is arranged on the handheld part 15. The connecting wire of the control circuit 40 passes through the wire hole 63 to realize the electrical connection between the control module 41 and the fan assembly 20, the heating assembly 30 and the sensing assembly 50.

[0074] Specifically, the connecting portion 11b has a passageway communicating with the air duct 12, and the wire hole 63 extends through the first rotating shaft base 61 and the second rotating shaft base 62, thereby forming a passageway for the connecting wire to enter the air duct 12. The wire hole 63 is designed to be coaxial with the rotation center of the rotating shaft structure 60, so that the connecting wire can rotate synchronously with the rotation of the handheld portion 15, preventing the connecting wire from being subjected to excessive pulling or folding, thereby ensuring the reliability of the electrical connection between the control module 41 and the fan assembly 20, the heating assembly 30, and the sensing assembly 50.

[0075] Of course, the design of the present application is not limited thereto. In other embodiments, the handheld portion 15 and the air duct portion 11 may also be connected in an openable and closable manner via the rotating shaft structure 60. In this case, the connecting wires may be provided with a certain length redundancy to ensure the reliability of the connection between the control module 41 and the fan assembly 20, the heating assembly 30 and other components.

[0076] In some embodiments, the air duct portion 11 is further provided with a sensing window 12 c communicating with the installation cavity 13 , and the sensing sides of the temperature sensor 52 and the distance sensor 53 face the sensing window 12 c .

[0077] It can be understood that the setting of the sensing window 12c enables the sensing component 50 to accurately detect the external environment or the air state in the air duct 12 without being exposed to the high-speed airflow or high-temperature environment in the air duct 12, thereby improving the sensing accuracy and stability.

[0078] In some embodiments, the sensing window 12c and the air outlet 12a are both disposed on an end surface of the same end of the air duct portion 11, and the sensing window 12c and the air outlet 12a are spaced apart.

[0079] This arrangement ensures that the sensing component 50 is effectively shielded from the direct influence of the high-speed airflow from the air outlet 12a during operation. For example, when the sensing side of the temperature sensor 52 or the distance sensor 53 faces the sensing window 12c, the sensing component 50 can accurately detect the temperature of the airflow at the air outlet 12a or the distance to an external object through this window, without being affected by airflow disturbances from the air outlet 12a or errors caused by excessively high temperatures. In other words, this spacing design provides a more stable operating environment for the sensing component 50, improving the accuracy and reliability of the detection signal.

[0080] Furthermore, the placement of the sensing window 12c and the air outlet 12a on the same end surface simplifies the overall housing design, making the structure of the air duct portion 11 more compact and unified. This design reduces the number of openings in the housing, thereby enhancing the overall aesthetics and integrity of the dryer. The spacing between the sensing window 12c and the air outlet 12a also creates a visually distinct partitioning effect, making the handheld dryer more harmonious in appearance and making it easier for users to distinguish the location of the air outlet 12a and the sensing area, thus enhancing the user experience.

[0081] In other embodiments, the sensing window 12 c may also be disposed at other locations, such as on the side of the air duct portion 11 .

[0082] In some embodiments, the sensing component 50 further includes a circuit board 414 facing the sensing window 12c. The temperature sensor 52, distance sensor 53 and displacement sensor 51 of the sensing component 50 are installed on a side of the circuit board 414 facing the sensing window 12c.

[0083] This design can effectively improve the overall compactness of the sensing component 50 and at the same time make the sensing end of each sensor closer to the sensing window 12c, thereby ensuring that the sensing component 50 can sense the external environment or various conditions inside the air duct 12 more directly and accurately.

[0084] In addition, through this layout, the other side of the circuit board 414 can be used to arrange other electronic components or perform wiring, thereby avoiding interference between the sensor and other components.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A handheld hair dryer, characterized in that: include: The housing includes an air duct portion and a hand-held portion connected to the side of the air duct portion, the air duct portion is provided with an air duct and a mounting cavity, the mounting cavity is located radially outside the air duct, and one end of the air duct portion is further provided with an air outlet connected to the air duct; a fan assembly, disposed in the air duct, for driving air through the air duct to flow toward the air outlet; A heating component is provided in the air duct; a control circuit, disposed in the housing, the control circuit being electrically connected to the fan assembly and the heating assembly, and being used to control the fan assembly and the heating assembly; and The sensing component is arranged in the installation cavity and is electrically connected to the control circuit.

2. The handheld hairdryer according to claim 1, wherein: The installation cavity and the air duct are separated by a separation structure.

3. The handheld hairdryer according to claim 1, wherein: The installation cavity is arranged at one end of the air duct portion.

4. The handheld hairdryer according to any one of claims 1 to 3, wherein: The housing includes an air duct housing, and a portion of the air duct housing corresponding to the installation cavity is gradually raised.

5. The handheld hairdryer according to claim 4, wherein: The handheld portion is foldably connected to the air duct portion. When the handheld portion is in a folded state, the mounting cavity is located on a side of the air duct portion facing away from the handheld portion.

6. The handheld hairdryer according to claim 5, wherein: The air duct portion includes a connecting portion extending toward the handheld portion, the connecting portion and the handheld portion being rotatably connected via an embedded rotating shaft structure, the rotating shaft structure including a first rotating shaft base provided on the connecting portion and a second rotating shaft base provided on the handheld portion, the first rotating shaft base and the second rotating shaft base being rotatably engaged, the handheld portion being rotated about the rotating shaft structure to be unfolded or folded relative to the air duct portion, wherein a wire hole is formed in the hollow portion of the rotating shaft structure; The control circuit includes a control module provided on the handheld portion, and the control module is electrically connected to the fan component, the heating component and the sensing component through the wire holes.

7. The handheld hairdryer according to any one of claims 1 to 3, characterized in that: The sensing component includes at least one of a displacement sensor, a temperature sensor, and a distance sensor.

8. The handheld hairdryer according to claim 7, wherein: The air duct portion is further provided with a sensing window communicating with the installation cavity, and the sensing side of the temperature sensor and / or the distance sensor faces the sensing window.

9. The handheld hairdryer according to claim 8, wherein: The sensing window and the air outlet are both arranged on the end surface of the same end of the air duct portion, and the sensing window and the air outlet are spaced apart.

10. The handheld hairdryer according to claim 8, wherein: The sensing component further includes a circuit board, which faces the sensing window. The temperature sensor, distance sensor and / or displacement sensor of the sensing component are installed on a side of the circuit board facing the sensing window.

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