A hair dryer

Abstract

The utility model relates to a kind of hair dryer, the hair dryer includes shell, fan and control circuit board, first air duct and installation cavity are equipped in the shell, the installation cavity has air inlet and air outlet, the air inlet is communicated with the first air duct, the air outlet is for airflow to discharge the installation cavity;The fan is located in the first air duct, the control circuit board is located in the installation cavity.The hair dryer of the utility model works, so that the airflow in first air duct can enter installation cavity by air inlet, and heat exchange with the control circuit board located in installation cavity, then flow out through the air outlet of installation cavity, and the heat of control circuit board is taken out hair dryer, to realize the cooling of control circuit board.Heat dissipation can effectively reduce the temperature of electronic components on control circuit board, prolong the service life of electronic components on control circuit board, thereby prolong the service life of hair dryer.

Description

Technical Field

[0001] This utility model relates to the field of hair dryer technology, and in particular to a hair dryer. Background Technology

[0002] Hair dryers typically consist of a casing, a fan, a heating element, and a control component. The control component includes a control circuit board and a control switch. The control circuit board houses electronic components that control the start and stop of the fan, heating element, etc. During operation, these electronic components generate heat. When their temperature reaches a high level (e.g., above 90°C), a protection mechanism is activated, and the hair dryer shuts off. To ensure continuous normal operation, a heat dissipation structure is needed to cool the control circuit board. However, current technology often suffers from poor heat dissipation in hair dryers, leading to high temperatures and short lifespans for the electronic components, thus shortening the overall lifespan of the hair dryer. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, this utility model proposes a hair dryer to extend its service life.

[0005] The hair dryer of this utility model includes a housing, a fan, and a control circuit board. The housing has a first air duct and a mounting cavity. The mounting cavity has an air inlet and an air outlet. The air inlet communicates with the first air duct, and the air outlet allows airflow to exit the mounting cavity. The fan is located in the first air duct, and the control circuit board is located in the mounting cavity.

[0006] Optionally, the housing includes a front housing and a handle housing, the rear end of the front housing is connected to a rear cover, the control circuit board is disposed inside the rear cover, and the rear cover is used to enclose the mounting cavity.

[0007] Optionally, both the air inlet and the air outlet are located at the front of the mounting cavity.

[0008] Optionally, a second air duct is provided inside the front shell, the second air duct is connected to the air outlet, and the air outlets of the first air duct and the second air duct are both located at the front end of the front shell.

[0009] Optionally, the first air duct is disposed within the front shell and the handle shell, the second air duct is disposed within the front shell, the air inlet of the first air duct is disposed at the lower part of the handle shell, and the fan is disposed within the handle shell.

[0010] Optionally, an air guide seat is provided inside the front shell on the front side of the rear cover, the rear cover is connected to the air guide seat, and a portion of the first air duct is enclosed between the air guide seat and the front shell.

[0011] Optionally, the air guide seat includes a first portion extending rearward into the rear cover, the first portion and the rear cover surrounding the mounting cavity, and the air inlet is located in the first portion.

[0012] Optionally, the air guide seat includes a second part, which forms a portion of the second air duct between the second part and the rear cover, and the air outlet is located on the rear cover and is provided corresponding to the second part.

[0013] Optionally, the front housing is provided with an air outlet ring, which surrounds a portion of the first air duct between the air outlet ring and the front housing, and the inner wall of the air outlet ring surrounds a portion of the second air duct. The air outlets of the first air duct and the second air duct are both located in the air outlet ring.

[0014] Optionally, the air outlet ring includes an inner cylinder and an outer ring, with the air outlet of the first air duct formed between the inner cylinder and the outer ring, and the air outlet of the second air duct formed at the front end of the inner cylinder.

[0015] Optionally, a heating element is provided in the first air duct, and the heating element is located in front of the air inlet.

[0016] Optionally, a ranging and temperature control electronic component is provided in the second air duct on the front side of the rear cover, and the ranging and temperature control electronic component is set corresponding to the air outlet of the second air duct.

[0017] Optionally, the ranging and temperature control electronics includes a time-of-flight sensor, and a lens is provided on the front side of the ranging and temperature control electronics for filtering light.

[0018] Optionally, the front end of the rear cover is provided with a connecting rod sleeve that extends into the second air duct, and the ranging and temperature control electronics and the lens are both connected to the connecting rod sleeve.

[0019] Optionally, the connecting rod is fitted with a connecting box, the ranging and temperature control electronics are located inside the connecting box, the connecting box has a perforation for light to pass through, and the lens blocks the perforation.

[0020] Optionally, the rear cover includes a mounting base and a cover plate, the cover plate being disposed on the rear side of the mounting base and connected to the mounting base, and the control circuit board being connected to the mounting base.

[0021] Optionally, the hair dryer also includes a control switch disposed on the handle housing, the control switch being electrically connected to a control circuit board.

[0022] When the hair dryer of this invention is in operation, driven by a fan within the first air duct, airflow enters from the air inlet of the first air duct and exits from the air outlet, thus drying the user's hair. By connecting the air inlet of the mounting cavity to the first air duct, airflow from the first air duct can enter the mounting cavity through the air inlet and exchange heat with the control circuit board located within the mounting cavity. The air then exits through the air outlet of the mounting cavity, carrying the heat from the control circuit board out of the hair dryer, thereby cooling the control circuit board. This effectively reduces the temperature of the electronic components on the control circuit board, extending their lifespan and consequently extending the lifespan of the hair dryer. Attached Figure Description

[0023] Figure 1 This is a perspective view of a hair dryer according to an embodiment of the present invention.

[0024] Figure 2 This is a cross-sectional view of a hair dryer according to an embodiment of the present invention.

[0025] Figure 3 This is a partial cross-sectional view of a hair dryer according to an embodiment of the present invention.

[0026] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0027] Figure 5 yes Figure 3 Enlarged view of point B in the middle.

[0028] Figure 6 This is a perspective view of a hair dryer according to another embodiment of the present invention.

[0029] 1. Front housing; 11. First air duct; 12. Second air duct; 13. Control circuit board; 14. Air guide seat; 141. First part; 1411. Air inlet; 142. Second part; 15. Control switch; 16. Heating switch; 17. Distance-measuring temperature control switch; 18. Mounting base; 19. Mica base; 20. Mica sheet;

[0030] 2. Handle housing; 21. Upper handle; 22. Lower handle; 23. Handle cover; 24. Air inlet cover; 25. Cable protection sleeve; 26. Fan;

[0031] 3. Rear cover; 31. Mounting base; 32. Cover plate; 33. Mounting cavity; 331. Air outlet; 34. Connecting rod sleeve; 35. Connecting box; 36. Distance measuring and temperature control electronic components; 37. Lens;

[0032] 4. Air outlet ring; 41. Inner cylinder; 42. Outer ring;

[0033] 5. Air nozzle. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] like Figures 1 to 5 As shown, the hair dryer of this embodiment includes a housing, a fan 26, and a control circuit board 13. The housing contains a first air duct 11 and a mounting cavity 33. The mounting cavity 33 has an air inlet 1411 and an air outlet 331. The air inlet 1411 communicates with the first air duct 11, and the air outlet 331 allows airflow to exit the mounting cavity 33. The fan 26 is located within the first air duct 11, and the control circuit board 13 is located within the mounting cavity 33.

[0036] When the hair dryer of this embodiment is working, driven by the fan 26 in the first air duct 11, airflow enters from the air inlet of the first air duct 11 and flows out from the air outlet of the first air duct 11, thereby drying the user's hair. By setting the air inlet 1411 of the mounting cavity 33 to communicate with the first air duct 11, the airflow in the first air duct 11 can enter the mounting cavity 33 through the air inlet 1411 and exchange heat with the control circuit board 13 located in the mounting cavity 33. Then, it flows out through the air outlet 331 of the mounting cavity 33, carrying the heat of the control circuit board 13 out of the hair dryer, thereby achieving cooling and heat dissipation of the control circuit board 13. As a result, the temperature of the electronic components on the control circuit board 13 can be effectively reduced, extending the service life of the electronic components on the control circuit board 13, thereby extending the service life of the hair dryer.

[0037] In some embodiments, such as Figure 2 and Figure 3 As shown, the outer shell includes a front shell 1 and a handle shell 2. The rear end of the front shell 1 is connected to a rear cover 3. The control circuit board 13 is located inside the rear cover 3. The rear cover 3 is used to enclose the mounting cavity 33.

[0038] By placing the control circuit board 13 inside the rear cover 3, the impact of the control circuit board 13 on the layout of the first air duct 11 can be reduced, which facilitates the layout design of the first air duct 11.

[0039] Optionally, the rear cover 3 includes a mounting base 31 and a cover plate 32. The cover plate 32 is located on the rear side of the mounting base 31 and connected to the mounting base 31. The control circuit board 13 is connected to the mounting base 31.

[0040] The control circuit board 13 can be connected to the mounting base 31 by screws. The cover plate 32 can be snapped onto the mounting base 31. It should be noted that the control circuit board 13 and the mounting base 31 can also be connected in other ways, such as by snapping or soldering, and are not limited to screw connections. Similarly, the cover plate 32 and the mounting base 31 can also be connected in other ways, such as by screw connections or soldering, and are not limited to snap-fit ​​connections.

[0041] For example, the rear cover 3 encloses a cavity with an opening facing backward, and the cover plate 32 is connected to the rear cover 3 and seals the opening of the cavity, so that an installation cavity 33 is enclosed between the rear cover 3 and the cover plate 32.

[0042] By configuring the rear cover 3 to include a mounting base 31 and a cover plate 32, the control circuit board 13 is connected to the mounting base 31, which facilitates the installation and fixation of the control circuit board 13.

[0043] Optionally, the cover plate 32 is a transparent cover plate, and a light source is provided inside the rear cover 3.

[0044] For example, the control circuit board 13 is equipped with LED beads, which form a light source.

[0045] By making the cover plate 32 transparent and setting a light source inside the rear cover 3, the rear cover 3 of the hair dryer has a luminous effect, improving the appearance of the hair dryer.

[0046] Furthermore, the airflow temperature of the hair dryer can be linked to the color of the light source, with different colors indicating different airflow temperatures. For example, the light source might be red when the airflow temperature is too high, orange when the airflow temperature is suitable, and blue when the airflow temperature is too low. The suitable airflow temperature can be understood as the temperature at which the air reaches the hair (°C).

[0047] Optionally, such as Figure 6 As shown, the hair dryer also includes a control switch 15 located on the handle housing 2, and the control switch 15 is electrically connected to the control circuit board 13.

[0048] By placing the control switch 15 on the handle housing 2, it is convenient for users to operate the control switch 15, thereby improving the user experience.

[0049] Optionally, such as Figure 2 and Figure 6 As shown, the hair dryer also includes a heating switch 16 and a distance-measuring temperature control switch 17 located on the handle housing 2.

[0050] In some embodiments, such as Figure 2 and Figure 3 As shown, the air inlet 1411 and the air outlet 331 are both located at the front of the mounting cavity 33.

[0051] By placing both the air inlet 1411 and the air outlet 331 at the front of the mounting cavity 33, it is possible to avoid opening holes at the rear of the rear cover 3. This prevents external dust, moisture, and other contaminants from entering the mounting cavity 33 through openings in the rear cover 3, which could affect the reliability of the control circuit board 13 and thus improve the reliability of the hair dryer. Furthermore, avoiding opening holes at the rear of the rear cover 3 also ensures the aesthetic appearance of the hair dryer.

[0052] Optionally, such as Figure 2 and Figure 3 As shown, a second air duct 12 is provided inside the front shell 1, and the second air duct 12 is connected to the air outlet 331. The air outlets of the first air duct 11 and the second air duct 12 are both located at the front end of the front shell 1.

[0053] Because the airflow has a relatively high velocity when it exits the air outlet of the first air duct 11, it can generate negative pressure near the air outlet of the first air duct 11, thereby driving the airflow near the air outlet of the first air duct 11. By setting the air outlets of the first air duct 11 and the second air duct 12 at the front end of the front shell 1, the air outlet of the second air duct 12 is close to the air outlet of the first air duct 11, thus creating negative pressure near the air outlet of the second air duct 12. The airflow in the second air duct 12 is ejected under the action of this negative pressure, which dries the user's hair.

[0054] This not only increases the airflow velocity within the mounting cavity 33, improving the cooling efficiency of the control circuit board 13 and extending the lifespan of the hair dryer, but also ensures that the airflow within the second air duct 12 is directed towards the user, guaranteeing the air volume of the hair dryer and enhancing the user experience.

[0055] Optionally, such as Figure 2 and Figure 3 As shown, the first air duct 11 is located inside the front shell 1 and the handle shell 2, and the second air duct 12 is located inside the front shell 1. The air inlet of the first air duct 11 is located at the lower part of the handle shell 2, and the fan 26 is located inside the handle shell 2.

[0056] By placing the air inlet of the first air duct 11 inside the handle housing 2 and the fan 26 inside the handle housing 2, the space inside the housing is made reasonable.

[0057] In some embodiments, a wind guide seat 14 is provided inside the front shell 1 on the front side of the rear cover 3, the rear cover 3 is connected to the wind guide seat 14, and a portion of the first air duct 11 is formed between the wind guide seat 14 and the front shell 1.

[0058] The air guide seat 14 can guide the airflow in the first air duct 11, making the airflow in the first air duct 11 smoother, which is conducive to improving the air output effect of the hair dryer and further improving the user experience.

[0059] Optionally, such as Figure 3 and Figure 4 As shown, the air guide seat 14 includes a first part 141 extending rearward into the rear cover 3. The first part 141 and the rear cover 3 enclose the mounting cavity 33, and the air inlet 1411 is provided in the first part 141.

[0060] For example, the air guide seat 14 includes a rearward protrusion, and the rear cover 3 is provided with an insertion hole. The protrusion is inserted into the insertion hole and seals with the insertion hole, and the protrusion forms the first part 141.

[0061] By providing a first portion 141 extending into the rear cover 3 in the air guide seat 14, and placing the air inlet 1411 in the first portion 141, the airflow in the first air duct 11 is guided by the air guide seat 14 and enters the mounting cavity 33 through the air inlet 1411. This helps to increase the airflow velocity within the mounting cavity 33, further improving the cooling and heat dissipation effect of the control circuit board 13 and extending the service life of the blower.

[0062] Optionally, such as Figure 3 and Figure 4 As shown, the air guide seat 14 includes a second part 142, which forms part of the second air duct 12 between the second part 142 and the rear cover 3. The air outlet 331 is located on the rear cover 3 and is provided corresponding to the second part 142.

[0063] For example, there is a gap between the second part 142 and the rear cover 3, which serves as part of the second air duct 12. The air outlet 331 is positioned directly opposite the second part 142 in the front-rear direction, so that the airflow from the air outlet 331 directly enters the second air duct 12.

[0064] The air outlet 331 is located on the rear cover 3 and corresponds to the second part 142, which facilitates the connection between the air outlet 331 and the second air duct 12. This helps to simplify the structure of the hair dryer and reduce its cost.

[0065] Optionally, an air outlet ring 4 is provided inside the front shell 1, and a portion of a first air duct 11 is formed between the air outlet ring 4 and the front shell 1. A portion of a second air duct 12 is formed by the inner wall of the air outlet ring 4. The air outlets of the first air duct 11 and the second air duct 12 are both located in the air outlet ring 4.

[0066] The air outlet ring 4 is designed to facilitate the formation of the first air duct 11 and the second air duct 12 within the front shell 1, which helps to simplify the structure of the hair dryer and reduce its cost.

[0067] Optionally, such as Figure 3 and Figure 5 As shown, the air outlet ring 4 includes an inner cylinder 41 and an outer ring 42. The air outlet of the first air duct 11 is formed between the inner cylinder 41 and the outer ring 42, and the air outlet of the second air duct 12 is formed at the front end of the inner cylinder 41.

[0068] For example, the rear end of the inner cylinder 41 is engaged with the front end of the air guide seat 14, and the inner wall of the inner cylinder 41, the inner wall of the air guide seat 14, and the rear cover 3 form a second air duct 12. The outer ring 42, the air guide seat 14, and the front shell 1 form part of the first air duct 11.

[0069] The air outlet ring 4 is designed as described above, which facilitates the formation of the air outlet of the first air duct 11 and the air outlet of the second air duct 12 at the front end of the front shell 1. This helps to simplify the structure of the hair dryer and reduce its cost.

[0070] Optionally, the air guide seat 14 is connected to the front shell 1, and the rear cover 3 is connected to the air guide seat 14.

[0071] For example, the air guide seat 14 is snapped into the front shell 1, and the rear cover 3 is connected to the air guide seat 14 by screws. Of course, the rear cover 3 and the air guide seat 14 can also be connected in other ways, such as by snapping or welding, and are not limited to screw connection. The air guide seat 14 can be provided with multiple connecting ribs, which are arranged circumferentially around the air guide seat 14. The rear cover 3 is connected to the connecting ribs, and airflow passes between adjacent connecting ribs.

[0072] Optionally, a portion of the inner diameter of the air guide seat 14 gradually increases from front to back. In other words, a portion of the air guide seat 14 is a trumpet-shaped structure with the opening facing backward.

[0073] By setting the air guide seat 14 to the above structure, the air guiding effect of the air guide seat 14 can be improved, and the air output speed of the hair dryer can be increased.

[0074] In some embodiments, such as Figure 6 As shown, a nozzle 5 is connected to the front end of the front shell 1, and the air outlets of the second air duct 12 and the first air duct 11 are both connected to the air outlet of the nozzle 5. The nozzle 5 is detachably connected to the front shell 1.

[0075] For example, nozzle 5 is snapped into front housing 1. In actual use, users can choose whether to use nozzle 5 according to their needs.

[0076] The airflows from the outlets of the second air duct 12 and the first air duct 11 converge at the outlet of the nozzle 5 and are ejected together through the outlet of the nozzle 5.

[0077] Optionally, a heating element is provided in the first air duct 11, and the heating element is located in front of the air inlet 1411.

[0078] The heating element is connected to the heating switch 16 via a signal.

[0079] By placing the heating element in front of the air inlet 1411, the airflow in the first air duct 11 enters the mounting cavity 33 through the air inlet 1411 before flowing past the heating element. This results in a lower airflow temperature entering the mounting cavity 33, improving the heat dissipation of the control circuit board 13 and further extending the lifespan of the hair dryer. Furthermore, the airflow flowing into the mounting cavity 33 through the air inlet 1411 is heated by the control circuit board 13, and the heated airflow is then ejected through the second air duct 12. This effectively utilizes the heat generated by the control circuit board 13, helping to save on the operating costs of the hair dryer.

[0080] Optionally, such as Figure 2 and Figure 3 As shown, the heating element includes a mica base 19 fitted outside the air outlet ring 4, and a fixing seat 18 between the mica base 19 and the rear cover 3. An outer mica cylinder is provided between the fixing seat 18 and the front shell 1, and an inner mica cylinder is provided between the fixing seat 18 and the air outlet ring 4. A plurality of mica sheets 20 are evenly distributed between the outer mica cylinder and the inner mica cylinder.

[0081] The mica base can be connected to the air outlet ring 4, the fixing base 18 can be connected to the air guide seat 14, the inner mica cylinder is connected to the mica base, and the outer mica cylinder is connected to the fixing base 18. For example, the mica base and the air outlet ring 4 can be plugged into each other, and the fixing base 18 and the air guide seat 14 can be connected by screws. The fixing base 18 and the air guide seat 14 can also be connected in other ways, such as by snap-fit ​​or welding, and are not limited to screw connection.

[0082] Among them, the mica sheet can be wound with heating wires to heat the airflow in the first air duct 11.

[0083] The way the heating element is set up facilitates its installation and fixation, and improves its reliability.

[0084] Optionally, such as Figure 2 and Figure 3 As shown, a distance measuring and temperature control electronic component 36 is provided inside the second air duct 12 on the front side of the rear cover 3, and the distance measuring and temperature control electronic component 36 is set corresponding to the air outlet of the second air duct 12.

[0085] Among them, the ranging and temperature control electronic component 36 is connected to the ranging and temperature control switch 17 via signal.

[0086] The distance-measuring and temperature-controlling electronic component 36 is used to detect the distance between the user's hair and the air outlet of the nozzle 5. Based on the distance between the hair and the air outlet of the nozzle 5, the heating power of the heating element is controlled so that when the hair is far from the air outlet of the nozzle 5, the airflow temperature blown out of the nozzle 5 is higher; when the hair is close to the air outlet of the nozzle 5, the airflow temperature blown out of the nozzle 5 is lower, thus ensuring that the airflow temperature reaching the hair is suitable (neither too high nor too low).

[0087] By setting the distance-measuring and temperature-controlling electronic component 36, the distance from the user's hair to the air outlet of the nozzle 5 is detected, so as to control the heating temperature of the airflow by the heating component according to the distance, so that the airflow temperature reaching the user's hair is suitable and the user experience is improved.

[0088] Optionally, such as Figure 2 and Figure 3 As shown, the ranging and temperature control electronics 36 includes a time-of-flight sensor (TOF sensor), and a lens 37 is provided on the front side of the ranging and temperature control electronics 36. The lens 37 is used to filter light.

[0089] The TOF sensor calculates distance by measuring the time difference between the transmission and reception of a light signal.

[0090] For example, a time-of-flight sensor includes a transmitting module and a receiving module. The transmitting module is used to emit light, and the receiving module is used to receive light. The transmitting module emits light forward, and the light is filtered by lens 37 before being emitted forward. The light reflected by the user passes through lens 37 and then enters the receiving module backward.

[0091] By setting lens 37 to filter light, stray light entering the receiving module can be reduced, improving the detection accuracy of the ranging and temperature control electronics 36 and enhancing the user experience of the hair dryer.

[0092] Optionally, such as Figure 2 and Figure 3 As shown, the front end of the rear cover 3 is provided with a connecting rod sleeve 34 that extends into the second air duct 12, and the ranging and temperature control electronic component 36 and the lens 37 are both connected to the connecting rod sleeve 34.

[0093] The connecting rod sleeve 34 facilitates the installation and fixation of the ranging and temperature control electronics 36 and the lens 37, thereby facilitating the assembly of the hair dryer.

[0094] Optionally, a connecting box 35 is attached to the connecting rod sleeve 34, and the ranging and temperature control electronic component 36 is located inside the connecting box 35. The connecting box 35 has a perforation for light to pass through, and the lens 37 blocks the perforation.

[0095] The lens 37 can also block the perforation to prevent external moisture, dust and other impurities from entering the connection box 35 through the perforation and affecting the operation of the distance and temperature control electronic component 36. This can further improve the detection accuracy of the distance and temperature control electronic component and improve the user experience of the hair dryer.

[0096] In some embodiments, such as Figure 2As shown, the handle housing 2 includes an upper handle 21 and a lower handle 22, forming a portion of a first air duct 11 between the upper handle 21 and the lower handle 22. The upper handle 21 and the lower handle 22 are connected. A handle sleeve 23 is fitted over the upper handle 21 and the lower handle 22, and a filter frame is connected to the lower end of the handle sleeve 23. A filter screen is installed inside the filter frame. The fan 26 is located on the upper side of the filter frame.

[0097] By setting up a filter frame and a filter screen, the airflow in the first air duct 11 is filtered by the filter screen when it flows through it, which can improve the quality of the airflow sprayed by the blower and further improve the user experience.

[0098] Optionally, an air inlet cover 24 is fitted onto the outer wall of the filter frame, and the air inlet of the first air duct 11 is located on the air inlet cover 24.

[0099] By placing the air inlet of the first air duct 11 on the air inlet cover 24, the airflow is filtered by the filter screen after entering the handle housing 2 through the air inlet cover 24, reducing or even eliminating the presence of impurities in the airflow entering the first air duct 11, so as to prevent impurities from damaging the internal components of the hair dryer, thereby further improving the reliability of the hair dryer.

[0100] Optionally, the filter holder is magnetically connected to the air inlet cover 24.

[0101] For example, an iron sheet is provided on the outside of the filter frame, and a filter magnet is provided on the inside of the air inlet cover 24. The filter magnet and the iron sheet are magnetically attracted to each other.

[0102] The filter holder and the air inlet cover 24 are magnetically connected, which facilitates the connection and disassembly of the filter holder and the air inlet cover 24.

[0103] Optionally, such as Figure 2 As shown, the lower ends of the upper handle 21 and the lower handle 22 are connected to the filter frame by a protective sleeve 25 for protecting the power cord.

[0104] The cord sleeve 25 improves the seal between the power cord and the handle housing 2, further enhancing the reliability of the hair dryer.

[0105] When the hair dryer is in use, driven by the fan 26 in the first air duct 11, the outside airflow enters the housing through the air inlet of the first air duct 11 and then flows within the first air duct 11. When the airflow in the first air duct 11 passes through the air guide seat 14, it splits into two parts. One part of the airflow enters the mounting cavity 33 through the air inlet 1411, exchanges heat with the control circuit board 13 in the mounting cavity 33, and then flows out through the air outlet 331 into the second air duct 12. The other part of the airflow and the airflow in the second air duct 12 are both ejected from the front end of the front housing 1.

[0106] In this embodiment, a negative pressure is created at the air outlet of the first air duct 11, resulting in a negative pressure at the air outlet of the second air duct 12. The airflow within the second air duct 12 is then rapidly ejected under this negative pressure. Compared to the negative pressure cooling methods used in related technologies, the hair dryer of this embodiment employs a main fluid (first air duct 11) diversion cooling method, which effectively improves the drawbacks of negative pressure cooling and enhances the heat dissipation effect of the control circuit board 13. The control circuit board 13 within the mounting cavity 33 maintains a low temperature after heat dissipation, effectively protecting the electronic components (e.g., chips) on it. This allows the hair dryer to operate normally at temperatures above 50°C and has a longer service life. Furthermore, the heat from the control circuit board 13 is used to heat the airflow, making efficient use of this heat and saving energy while maintaining the airflow effect and reducing operating costs. Additionally, the heat dissipation structure of the control circuit board 13, combined with the internal air ducts of the hair dryer, significantly simplifies the heat dissipation structure of the control circuit board 13 and the overall structure of the hair dryer.

[0107] When the distance-measuring and temperature-controlling electronic component 36 is activated, it can detect the distance between the user's head and the hair dryer. When the distance between the user's head and the hair dryer is far, it controls the temperature of the heating component to increase; when the distance between the user's head and the hair dryer is close, it controls the temperature of the heating component to decrease, so that the temperature of the airflow blowing on the hair is kept constant at about 50℃.

[0108] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hair dryer, characterized in that, include: The housing has a first air duct and a mounting cavity inside. The mounting cavity has an air inlet and an air outlet. The air inlet is connected to the first air duct, and the air outlet allows airflow to exit the mounting cavity. The fan and the control circuit board are located in the first air duct and the mounting cavity, respectively.

2. The hair dryer according to claim 1, characterized in that, The housing includes a front housing and a handle housing. A rear cover is connected to the rear end of the front housing. The control circuit board is located inside the rear cover, which is used to enclose the mounting cavity.

3. The hair dryer according to claim 2, characterized in that, Both the air inlet and the air outlet are located at the front of the mounting cavity.

4. The hair dryer according to claim 3, characterized in that, The front shell is provided with a second air duct, which is connected to the air outlet. The air outlets of the first air duct and the second air duct are both located at the front end of the front shell.

5. The hair dryer according to claim 4, characterized in that, The first air duct is located inside the front shell and the handle shell, the second air duct is located inside the front shell, the air inlet of the first air duct is located at the lower part of the handle shell, and the fan is located inside the handle shell.

6. The hair dryer according to claim 4, characterized in that, An air guide seat is provided inside the front shell on the front side of the rear cover. The rear cover is connected to the air guide seat, and a portion of the first air duct is formed between the air guide seat and the front shell.

7. The hair dryer according to claim 6, characterized in that, The air guide seat includes a first part that extends rearward into the rear cover, the first part and the rear cover surrounding the mounting cavity, and the air inlet is located in the first part.

8. The hair dryer according to claim 6, characterized in that, The air guide seat includes a second part, which forms a portion of the second air duct between the second part and the rear cover, and the air outlet is located on the rear cover and is provided corresponding to the second part.

9. The hair dryer according to claim 4, characterized in that, The front shell is provided with an air outlet ring, which forms a part of the first air duct between the air outlet ring and the front shell. The inner wall of the air outlet ring forms a part of the second air duct. The air outlets of the first air duct and the second air duct are both located in the air outlet ring.

10. The hair dryer according to claim 9, characterized in that, The air outlet ring includes an inner cylinder and an outer ring. The air outlet of the first air duct is formed between the inner cylinder and the outer ring, and the air outlet of the second air duct is formed at the front end of the inner cylinder.

11. The hair dryer according to claim 3, characterized in that, A heating element is provided inside the first air duct, and the heating element is located in front of the air inlet.

12. The hair dryer according to claim 4, characterized in that, The second air duct is provided with a distance measuring and temperature control electronic component on the front side of the rear cover, and the distance measuring and temperature control electronic component is set corresponding to the air outlet of the second air duct.

13. The hair dryer according to claim 12, characterized in that, The ranging and temperature control electronics include a time-of-flight sensor, and a lens is provided on the front side of the ranging and temperature control electronics for filtering light.

14. The hair dryer according to claim 13, characterized in that, The front end of the rear cover is provided with a connecting rod sleeve that extends into the second air duct, and the ranging and temperature control electronic component and the lens are both connected to the connecting rod sleeve.

15. The hair dryer according to claim 14, characterized in that, The connecting rod is fitted with a connecting box, the ranging and temperature control electronics are located inside the connecting box, the connecting box has a perforation for light to pass through, and the lens blocks the perforation.

16. The hair dryer according to any one of claims 2-15, characterized in that, The rear cover includes a mounting base and a cover plate. The cover plate is located on the rear side of the mounting base and connected to the mounting base. The control circuit board is connected to the mounting base.

17. A hair dryer according to any one of claims 2-15, characterized in that, The hair dryer also includes a control switch located on the handle housing, and the control switch is electrically connected to the control circuit board.

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