Hair dryer

Abstract

The utility model discloses a hair dryer, it can include: handle with air inlet, the air duct with air outlet is communicated with handle to allow the airflow from handle to enter air duct, fan assembly is contained in handle, wherein, handle is provided with a plurality of non-through noise reduction holes relative to the outer wall in the inner wall. The hair dryer according to the utility model embodiment has lower noise when working, and can improve the use experience of user.

Description

Technical Field

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

[0002] Currently, hair dryers often generate significant noise during operation. This noise primarily originates from the internal airflow noise and the fan operation noise, which diminishes the user experience.

[0003] Therefore, there is an urgent need to provide an improved low-noise hair dryer to enhance the user experience.

[0004] The background description is provided for the purpose of understanding the relevant technologies in this field and is not intended as an admission of prior art. Utility Model Content

[0005] Therefore, the present invention aims to provide a hair dryer with lower operating noise to improve the user experience.

[0006] In some embodiments of this utility model, a hair dryer is provided, which may include:

[0007] A handle with an air inlet end;

[0008] A blower duct with an air outlet is connected to the handle to allow airflow from the handle to enter the blower duct;

[0009] The fan assembly is housed in the handle;

[0010] The handle has multiple noise reduction holes on its inner wall that are not through the outer wall.

[0011] In some embodiments, the plurality of noise reduction holes are located upstream of the fan assembly along the airflow direction and downstream of the air inlet end along the airflow direction.

[0012] In some embodiments, the plurality of noise reduction holes are disposed on the fluid channel between the air inlet and the fan assembly.

[0013] In some embodiments, the plurality of noise reduction holes includes multiple rows of noise reduction holes spaced apart along the handle axis.

[0014] In some embodiments, at least one row of noise reduction holes spaced apart along the handle axial direction has a different hole size than the other rows of noise reduction holes.

[0015] In some embodiments, the noise reduction holes in the multiple rows spaced apart along the handle axis have different hole sizes corresponding to different noise frequencies.

[0016] In some embodiments, the handle includes a handle housing and a handle inner housing, wherein a handle cavity is defined in the handle inner housing.

[0017] In some embodiments, the noise reduction hole includes a through hole extending through the inner shell of the handle.

[0018] In some embodiments, a gap space is defined between the handle outer shell and the handle inner shell, and the handle inner cavity communicates with the gap space through the plurality of through holes.

[0019] In some embodiments, the handle outer shell and the handle inner shell are tightly fitted together at the location of the noise reduction hole.

[0020] In some embodiments, the noise reduction hole includes a countersunk hole disposed in the handle housing corresponding to the through hole.

[0021] In some embodiments, the noise reduction hole includes a countersunk hole disposed in the inner shell of the handle.

[0022] In some embodiments, the inner housing of the handle also has a plurality of wiring holes, wherein the cable of the hair dryer extends through the wiring holes into the gap space and is wired between the outer housing of the handle and the inner housing of the handle.

[0023] In some embodiments, the duct includes a duct shell and an inner cylinder structure housed in the duct shell. The inner cylinder structure includes a flow-guiding outer wall, a flow-guiding inner wall, and a rear end wall. The rear end wall connects the flow-guiding outer wall and the flow-guiding inner wall.

[0024] Wherein, a first air outlet cavity is defined between the outer wall of the guide and the inner wall of the guide, a second air outlet cavity is defined by the inner wall of the guide and separated from the first air outlet cavity, and an installation space is defined between the rear end wall of the inner cylinder structure and the outer shell of the air duct;

[0025] The outer wall of the guide has a first fluid inlet that communicates with the first air outlet cavity to allow airflow from the inner cavity of the handle to flow into the first air outlet cavity;

[0026] The rear end wall has a second fluid inlet communicating with the second air outlet cavity to allow airflow from the installation space to flow into the second air outlet cavity;

[0027] The rear end wall also has at least one cooling fluid hole communicating with the first air outlet cavity to allow cooling airflow from the first air outlet cavity to flow into the mounting space.

[0028] In some embodiments, an isolation portion is formed between the air duct and the handle to isolate the mounting space from the inner cavity of the handle.

[0029] The hair dryer provided by this utility model utilizes multiple noise-reducing holes set on the inner wall of the handle. These holes resonate with noise waves to form a resonator array, allowing them to effectively dissipate the energy of noise waves and reduce noise levels. Therefore, the hair dryer provided by this utility model significantly reduces operating noise, improves airflow stability and space utilization, and enhances the user experience.

[0030] Other optional features and technical effects of the embodiments of this utility model are partly described below and partly apparent from reading this document. Attached Figure Description

[0031] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The elements shown are not limited to the scale shown in the drawings, and the same or similar reference numerals in the drawings denote the same or similar elements, wherein:

[0032] Figure 1 This is an exemplary perspective view of a hair dryer according to an embodiment of the present utility model;

[0033] Figure 2 This is an exemplary cross-sectional view of a hair dryer according to an embodiment of the present utility model;

[0034] Figure 3 This is an exemplary cross-sectional view of a hair dryer according to an embodiment of the present utility model;

[0035] Figure 4 This is an exemplary side view of the inner cylinder structure of a hair dryer according to an embodiment of the present utility model;

[0036] Figure 5 This is an exemplary front view of the inner cylinder structure of a hair dryer according to an embodiment of the present utility model;

[0037] Figure 6 This is an exemplary rear view of the inner cylinder structure of a hair dryer according to an embodiment of the present utility model;

[0038] Figure 7 This is an exemplary bottom view of the inner cylinder structure of a hair dryer according to an embodiment of the present utility model;

[0039] Figure 8 This is an exemplary side cross-sectional view of the blower casing according to an embodiment of the present utility model, wherein an inner cylinder structure according to an embodiment of the utility model is installed.

[0040] Figure label:

[0041] 100. Hair dryer;

[0042] 10. Handle; 11. Handle outer shell; 12. Handle inner shell; 13. Noise reduction hole; 14. Air inlet; 141. Air inlet hole; 15. Cable routing hole; 16. Gap space; 17. Handle inner cavity;

[0043] 20. Air duct; 21. Air duct housing; 211. Insulation section; 22. Air outlet; 23. Heating component; 24. Installation space; 25. Circuit board; 251. Power module;

[0044] 30. Inner cylinder structure; 31. Outer wall of the flow guide; 311. Front section of the outer wall; 312. Rear section of the outer wall; 318. Rear end wall; 32. First fluid inlet; 33. Cooling fluid hole; 34. Inner wall of the flow guide;

[0045] 35. First air outlet cavity; 351. First air outlet; 36. Second air outlet cavity; 361. Second fluid inlet; 363. Second air outlet;

[0046] 40. Fan assembly. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0048] In the embodiments of this utility model, unless otherwise explicitly stated, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples.

[0050] In this regard, in some embodiments of the present invention, reference is made to Figure 1 A hair dryer 100 is provided, which may include a handle 10 and a nozzle 20 connected to each other. In some embodiments, the handle 10 may have an air inlet end 14, the air inlet end 14 having, for example, a plurality of air inlet holes 141, so that outside air can enter the handle 10 from the air inlet end 14 and then flow to the nozzle 20. Figure 2 In the illustrated embodiment, the airflow direction is schematically shown with dashed arrows. In this embodiment, the air duct 20 may have an outlet end 22, through which airflow from the handle 10 can be discharged.

[0051] In some embodiments, reference Figure 2 The handle 10 may accommodate a fan assembly 40, which can be used to generate airflow and drive the airflow from the air inlet 14 to the air duct 20. In some embodiments, the cross-section of the handle 10 along the airflow direction may optionally be circular or elliptical, and the present invention does not limit this.

[0052] In some embodiments of this utility model, reference is made to Figure 2 The handle 10 may have multiple noise reduction holes 13 on its inner wall that do not penetrate the outer wall. In other words, unlike the air inlet hole 141 on the aforementioned air inlet end 14, the multiple noise reduction holes 13 do not penetrate the outer wall of the handle 10, meaning that the multiple noise reduction holes 13 are not directly connected to the external gas environment of the hair dryer 100. In this embodiment, the noise reduction hole 13 can also be called a resonance hole. For illustrative purposes and not as a limitation, when noise passes through the noise reduction hole 13, the air column in the noise reduction hole 13 will produce acoustic resonance with the noise of a specific frequency, and the noise energy will be partially absorbed. Thus, the noise reduction hole 13 can effectively absorb and reduce the noise generated during the operation of the hair dryer 100, thereby reducing the overall noise level of the hair dryer 100 and improving the user's comfort when using the hair dryer 100.

[0053] In this embodiment of the invention, the plurality of noise reduction holes 13 may be disposed at various positions on the inner wall of the handle 10, including but not limited to positions on the inner wall of the handle 10 located upstream or downstream of the fan assembly 40. In some embodiments, the plurality of noise reduction holes 13 may also be disposed on the air inlet end 14, for example in the form of a countersunk hole that is not connected to the outside.

[0054] As previously described, outside air can enter the handle 10 through the air inlet 14 and then flow to the air duct 20. Inside the handle 10, a fluid channel is formed between the air inlet 14 and the fan assembly 40, allowing airflow to flow from the air inlet 14 to the fan assembly 40. In some embodiments, reference is made to... Figure 2 The plurality of noise reduction holes 13 are disposed on the fluid channel of the handle 10 between the air inlet end 14 and the fan assembly 40. In other words, referring to Figure 2Multiple noise reduction holes 13 are located upstream of the fan assembly 40 along the airflow direction in the fluid channel, and downstream of the air inlet end 14 along the airflow direction. Therefore, by placing the multiple noise reduction holes 13 upstream of the fan assembly 40 rather than downstream, the multiple noise reduction holes 13 located between the air inlet end 14 and the fan assembly 40 can control airflow noise before the noise source (initial turbulence and pressure fluctuations) forms, thereby suppressing noise more efficiently. At the same time, this design avoids interference with the already accelerated and directional airflow downstream of the fan assembly 40, i.e., between the fan assembly 40 and the air duct 20, ensuring the wind speed and airflow of the blower. It should be understood that in this embodiment of the invention, the term "inner wall" includes the wall structure located between the outer wall of the handle 10 that directly contacts the outside and the internal fluid channel of the handle 10. In some embodiments, when the handle 10 adopts a single-layer shell structure, the "inner wall" may include the wall surface of the single-layer shell facing the inner cavity of the handle. In some embodiments, when the handle 10 adopts a double-layer or multi-layer housing structure, the "inner wall" may include any wall structure located between the outer wall and the inner surface defining the internal fluid channel of the handle 10, such as a multi-layer housing wall located between the outer wall and the internal cavity of the handle 10.

[0055] In some embodiments, reference Figure 2 The plurality of noise reduction holes 13 include multiple rows of noise reduction holes 13 spaced apart along the axial direction of the handle 10. In this embodiment, a row of noise reduction holes 13 may include one or more noise reduction holes 13. In one example, the inner shell 12 of the handle has 12 noise reduction holes 13, which are arranged in three parallel rows. In this embodiment, on the one hand, by spaced apart along the axial direction of the handle 10, the noise reduction holes 13 can gradually reduce the noise of the airflow along the airflow direction; on the other hand, by designing multiple rows of noise reduction holes 13, this multi-row layout design helps the multiple noise reduction holes 13, optionally, multiple noise reduction holes 13 with the same hole parameters, to resonate with each other, thereby further reducing the noise in the hair dryer 100. In other embodiments, the plurality of noise reduction holes 13 may also include multiple rows of noise reduction holes 13 spaced apart circumferentially along the handle 10. This design can reduce noise in all directions inside the handle 10 as comprehensively as possible. In other embodiments, the number of noise reduction holes 13 is not limited to the number shown in the above embodiments, and the arrangement of noise reduction holes 13 is not limited to three rows. It can be designed to have more rows according to actual needs, or different arrangement methods such as rectangular array, hexagonal array or concentric circle array can be adopted. This utility model does not limit this.

[0056] In some embodiments, at least one row of noise-reducing holes 13 arranged axially along the handle 10 has a different hole size than the other rows. In this embodiment, the hole size includes, but is not limited to, the hole diameter, hole depth, spacing between holes, and hole shape. By way of explanation and not limitation, air columns within different hole sizes can absorb noise of different specific frequencies. Thus, the multiple rows of noise-reducing holes 13 can be tuned to slightly different resonant frequencies through certain geometric differences (such as hole diameter, depth, or spacing), thereby creating a noise reduction effect covering a wider frequency band. This effectively absorbs and reduces frequency conversion noise generated at different speeds during fan operation, ensuring stable noise reduction performance under various operating conditions. In other embodiments, the shape of the noise-reducing holes includes, but is not limited to, circular, elliptical, rectangular, or polygonal shapes, and different shapes can be selected according to different noise frequency characteristics.

[0057] In some embodiments, different rows of noise-reducing holes 13 arranged axially along the handle 10 may have different hole sizes corresponding to different noise frequencies of the hair dryer 100. In this embodiment, different rotational speeds of the fan assembly 40 of the hair dryer 10 may correspond to different noise frequencies. Thus, in some embodiments, the fan assembly 40 of the hair dryer 10 may have different speed settings, and a portion of the noise-reducing holes 13 in the multiple rows may have a first hole size corresponding to a first noise frequency / first speed setting, while another portion of the noise-reducing holes 13 in the multiple rows may have a second hole size corresponding to a second noise frequency / second speed setting. This differentiated hole size arrangement ensures that the hair dryer maintains good noise reduction performance under different operating modes and speeds, providing a noise control solution for all operating conditions.

[0058] In some embodiments of this invention, the handle 10 can be a single-layer structure or a multi-layer structure. In some embodiments, the noise reduction hole 13 can be configured as either a through hole or a countersunk hole.

[0059] In some embodiments, the noise reduction hole 13 includes a through hole that penetrates the inner shell 12 of the handle. In this embodiment, it should be understood that at least a portion of the noise reduction hole 13 may be formed as a through hole that penetrates the inner shell 12 of the handle, and another portion may be formed as a countersunk hole that does not penetrate the inner shell 12 of the handle.

[0060] In some embodiments, reference Figure 3The noise reduction hole 13 includes a through hole penetrating the inner shell 12 of the handle. A gap space 16 is defined between the outer shell 11 and the inner shell 12 of the handle. The inner cavity 17 of the handle communicates with the gap space 16 through multiple through holes. In this embodiment, the multiple noise reduction holes 13 and the gap space 16 between the outer shell 12 and the inner shell 12 of the handle form an acoustic structure conforming to the principle of a Helmholtz resonator. For illustrative purposes, and not as a limitation, a Helmholtz resonator is an acoustic structure composed of channels and cavities. When the frequency of a sound wave is close to the resonant frequency of the resonator, the sound wave energy is absorbed by the resonator and converted into heat energy, thereby achieving a noise reduction effect. In this embodiment, the gap space 16 thus substantially forms a noise reduction cavity. Therefore, in this embodiment, the multiple noise reduction holes 13 form the "neck" or "channel" of the Helmholtz resonator, thereby providing a propagation path for sound waves; the gap space 16 connected to the multiple noise reduction holes 13 acts as the "cavity" for acoustic resonance. When the noise generated by the airflow driven by the fan assembly 40 in the inner cavity 17 of the handle propagates to the noise reduction holes 13, it will excite the air column vibration in the multiple noise reduction holes 13 to form a resonant vibration, thereby absorbing and converting the noise energy in the inner cavity 17 of the handle, thereby reducing the noise of a specific frequency in the hair dryer, thereby reducing the noise when the hair dryer is used and improving the user experience.

[0061] In some embodiments, noise reduction holes 13 may be provided on both the handle housing 11 and the handle inner housing 12. In some embodiments, the noise reduction hole 13 includes a countersunk hole in the handle housing 11 corresponding to the through hole. In this embodiment, the noise reduction hole design on the double-layer housing creates an acoustic resonator combination structure. After the noise wave enters the gap space through the through hole on the handle inner housing 12, it encounters the countersunk hole on the handle housing 13 again, forming a two-stage sound energy absorption mechanism. This structure extends the effective noise reduction bandwidth, enabling more comprehensive control of broadband noise that is difficult to handle with a single structure.

[0062] In some embodiments, the noise reduction hole 13 includes a through hole penetrating the inner shell 12 of the handle, and the outer shell 11 and the inner shell 12 of the handle fit tightly together at the location of the noise reduction hole 13. In this embodiment, the inner wall of the outer shell 11 may or may not have a noise reduction hole 13, or it may have a countersunk hole corresponding to the through hole of the inner shell 12. In this embodiment, when the noise reduction hole 13 includes a through hole penetrating the inner shell 12 of the handle, the noise reduction hole 13 at this location forms an actual countersunk hole, that is, the noise reduction hole 13 only communicates with the inner cavity 17 of the handle defined by the inner shell 12 of the handle, and does not communicate with the gap space 16 formed by the outer shell 11 and the inner shell 12 of the handle. Thus, when the noise sound wave in the inner cavity 17 of the handle propagates to the countersunk hole, part of the sound energy enters the noise reduction hole 13 and is reflected at its closed end to form a standing wave. At a certain frequency, these reflected waves and the incident wave produce destructive interference, thereby effectively absorbing the noise in the inner cavity 17 of the handle, reducing the noise of the hair dryer, and this design also maintains the integrity of the airflow channel and the stability of the flow rate. In this embodiment, the different rows of noise reduction holes 13 in the multi-row noise reduction holes 13 can also have different hole sizes corresponding to different noise frequencies of the hair dryer 100, which will not be described in detail here.

[0063] In some embodiments of this utility model, reference is made to Figure 2 The device comprises a handle outer shell 11 and a handle inner shell 12, with the handle inner shell 12 defining a handle inner cavity 17 in which the blower assembly 40 can be accommodated. In this embodiment, the double-layer shell structure of the handle outer shell 11 and the handle inner shell 12 forms an effective acoustic isolation system, which can block the transmission of mid-to-high frequency noise generated by the blower assembly 40 to the outside. Compared with a single-layer shell, this reduces the noise of the blower and improves the user experience.

[0064] In some embodiments of this utility model, reference is made to Figure 3 A gap space 16 is defined between the handle outer shell 11 and the handle inner shell 12. In this embodiment, the handle inner shell 12 also has multiple wiring holes 15, through which the internal cables (not shown) of the hair dryer 100 can extend into the gap space 16 and be routed between the handle outer shell 11 and the handle inner shell 12. Thus, the gap space 16 defined by the double-shell design partially becomes the wiring space for the internal wiring of the hair dryer, thereby minimizing the intrusion of internal cables into the handle inner cavity 17, reducing the obstruction of airflow within the handle inner cavity 17 by internal cables, ensuring a simple airflow path, reducing the formation of airflow turbulence and pressure loss, and thus reducing the noise of the hair dryer. Furthermore, this design also improves the space utilization of the hair dryer 100, making the structure of the handle 10 more compact and contributing to the miniaturization design of the hair dryer 100.

[0065] The hair dryer 100 provided by this utility model achieves the dual goals of noise control and airflow optimization: First, the double-layer shell structure of the handle outer shell 11 and the handle inner shell 12 forms an effective acoustic isolation system, blocking the propagation of fan noise. Second, the gap space 16 between the double shells is used for wiring, ensuring a simple airflow channel and reducing turbulence to lower noise. Simultaneously, multiple noise-reducing holes 13 on the handle inner shell 12, together with the gap space 16, form a Helmholtz resonator array, providing effective absorption of noise in a predetermined frequency band, further reducing noise. Furthermore, different rows of noise-reducing holes 13 have different hole sizes corresponding to different noise frequencies, thereby comprehensively reducing noise over a wider frequency range, thus reducing multi-frequency noise and consequently reducing noise throughout the entire operating condition of the hair dryer. The hair dryer 100 provided by this utility model has significantly reduced operating noise, improved airflow stability and space utilization, and improved user experience.

[0066] In some embodiments of this utility model, reference is made to Figure 2 The present invention also provides a hair dryer 100, which may include a handle 10 having an air inlet end 14 and a blower 20 having an air outlet end 22, wherein the handle 10 may define a handle cavity 17, and the blower 20 includes a blower housing 21 and an inner cylinder structure 30 housed in the blower housing 21.

[0067] In some embodiments, the outer casing 21 of the air duct may house a heating component 23 and a circuit board 25. The circuit board 25 is electrically connected to the fan assembly 40, thereby controlling the fan assembly 40 to introduce outside air from the air inlet 14 into the handle cavity 17, and then discharge it from the air outlet 22 of the air duct 20. Similarly, the circuit board 25 is electrically connected to the heating component 23, thereby enabling the heating component 23 to perform operations such as heating the airflow entering the inner cylinder structure 30. In this embodiment, the electrical connection is, for example, via a cable.

[0068] In some embodiments, reference Figure 2 The inner cylinder structure 30 can be used to receive airflow from the handle cavity 17 and guide the airflow to the outlet 22 and discharge it. In this embodiment, the inner cylinder structure 30 may include a guide outer wall 31, a guide inner wall 34 and a rear end wall 318, wherein the rear end wall 318 connects the guide outer wall 31 and the guide inner wall 34.

[0069] In this embodiment, in conjunction with reference Figures 3 to 8The inner cylinder structure 30 is divided into multiple spaces that allow airflow. A first air outlet cavity 35 is defined between the outer guide wall 31 and the inner guide wall 34. A second air outlet cavity 36, separated from the first air outlet cavity 35, is defined by the inner guide wall 34. An installation space 24 is defined between the rear end wall 318 of the inner cylinder structure 30 and the outer shell 21 of the air duct. In this embodiment, the aforementioned heating component 23 may be disposed in the first air outlet cavity 35, and the heating component 23 is located at the front end of the first air outlet cavity 35; the aforementioned circuit board 25 may be accommodated in the installation space 24.

[0070] In some embodiments, reference Figure 8 The rear wall 318 separates the first air outlet cavity 35 and the second air outlet cavity 36 from direct communication. This closed inner cylinder structure prevents direct exchange and mixing of airflow between the first and second air outlet cavities 35 and 36. Compared to traditional open guide vane structures, this closed design significantly improves the flow field distribution and airflow quality within the blower, preventing high-speed airflow entering from the handle inner cavity 17 from mixing and turbulence inside the blower. This reduces pressure loss within the blower and lowers overall airflow noise. Furthermore, this inner cylinder structure design particularly ensures the stability and uniformity of airflow around the heating element 23, preventing uneven heating caused by turbulent airflow contacting the heating element 23, resulting in localized hot spots and temperature fluctuations. This reduces airflow noise around the heating element 23, improves the heating efficiency of the heating element 23, and enhances the overall performance of the blower 100.

[0071] In this embodiment, the guide wall 31 has a first fluid inlet 32 ​​communicating with the first air outlet cavity 35 to allow airflow from the handle cavity 17 to flow into the first air outlet cavity 35 and out through the first air outlet 351 of the first air outlet cavity 35 to the outside. Thus, a first fluid path is formed within the blower 100, consisting of the handle cavity 17, the first fluid inlet 32, the first air outlet cavity 35, and the first air outlet 351. Specifically, the airflow from the handle cavity 17 first enters the first air outlet cavity 35 through the first fluid inlet 32, and then flows out through the first air outlet 351 of the first air outlet cavity 35 to the outside. Therefore, in the first fluid path, most of the airflow from the handle cavity 17 flows stably along the designed closed first air outlet cavity 35. This single airflow source design avoids airflow field turbulence caused by the mixing of different airflows, reduces airflow noise within the first air outlet cavity 35, and, with the help of the arc-shaped windward surface of the guide wall 34, reduces pressure loss caused by turning and cross-sectional changes, thus improving airflow efficiency.

[0072] In some embodiments, reference Figure 8The rear end wall 318 also has at least one cooling fluid hole 33 communicating with the first air outlet cavity 35 to allow cooling airflow from the first air outlet cavity 35 to flow into the mounting space 24. In this embodiment, the rear end wall 318 has a second air outlet cavity 36 communicating with the second air outlet cavity 36 to allow airflow from the mounting space 24 to flow into the second air outlet cavity 36, and the second air outlet cavity 36 has a second air outlet 363. Thus, a second fluid path is formed within the blower 100, consisting of the handle cavity 17, the first fluid inlet 32, the first air outlet cavity 35, the cooling fluid hole 33, the mounting space 24, the second fluid inlet 361, the second air outlet cavity 36, and the second air outlet 363. Specifically, a small portion of the airflow entering the first fluid inlet 32 ​​enters the mounting space 24 through the cooling fluid hole 33, then enters the second air outlet cavity 36 via the second fluid inlet 361, and is discharged from the second air outlet 363. Thus, in the second fluid path, the airflow from the cooling fluid hole 33 can be used to cool the circuit board 25 in the mounting space 24. The airflow flowing through the circuit board 25 is then discharged through the second air outlet 363 of the second air outlet cavity 36. This design cleverly combines the blowing function with the cooling function, and can effectively dissipate heat from the circuit board 25 without the need for an additional cooling device, thereby extending the service life of the circuit board 25 and the electrical components mounted on the circuit board 25.

[0073] In some embodiments, at least one cooling fluid hole 33 is disposed at the lower part of the rear end wall 318. This brings the cooling fluid hole 33 closer to the first fluid inlet 32, ensuring sufficient airflow to the installation space 24, and ensuring that the airflow exiting the cooling fluid hole 33 can naturally flow to the second air outlet 36 and be discharged, preventing its accumulation within the installation space 24.

[0074] In some embodiments, as previously described, a plurality of electrical components are mounted on the circuit board 25. These components perform different control and drive functions during the operation of the hair dryer 100. These include a power module 251, which is not limited to, power transistors, IGBTs, or other power semiconductor devices or integrated circuits. The power module 251 is primarily used to control the power output of the heating element 23 and the fan assembly 40 of the hair dryer 100. In this embodiment, since the power module 251 needs to handle large currents and voltages during operation, it generates significant heat; therefore, effective heat dissipation is advantageous.

[0075] In some embodiments, reference Figure 8At least a portion of the cooling fluid holes 33 in at least one of the guide outer wall 31 are aligned with the power module 251 on the circuit board 25. Thus, the cooling airflow flowing from the cooling fluid holes 33 to the mounting space 24 can directly and specifically wash the surface of the power module 251. With this directional cooling design, the cooling airflow can efficiently remove the heat generated by the power module 251 during operation, preventing heat accumulation in the mounting space 24, reducing the operating temperature of the power module 251, thereby improving the operational stability and reliability of the circuit board 25 and the power module 251, and extending their service life.

[0076] In some embodiments, the mounting space 24 is also configured not to be in direct communication with the handle cavity 17. In this embodiment, reference... Figure 2 An isolation section 211 is formed between the air duct 20 and the handle 10, isolating the mounting space 24 from the handle cavity 17. Thus, the high-speed airflow from the handle cavity 17 enters the first outlet cavity 35 only through the first fluid inlet 32, and then enters the entire air duct. Therefore, on the one hand, this sealing design prevents the high-speed airflow entering from the handle cavity 17 from directly impacting the air duct housing 21 and the circuit board 25 installed in the mounting space 24, reducing the impact of airflow on the circuit board 25 and the resulting mechanical vibration, thereby protecting the circuit board 25 and reducing vibration noise. On the other hand, this design avoids strong airflow separation and secondary flow caused by airflow impacting the circuit board 25, reducing noise generated by airflow turbulence, and also ensuring the stability and uniformity of the airflow flowing into the second outlet cavity 36.

[0077] In some embodiments, the second air outlet cavity 36 is configured as a columnar inner cavity, and the first air outlet cavity 35 is configured as an annular columnar inner cavity surrounding the second air outlet cavity 36.

[0078] In some embodiments of this utility model, reference is made to Figure 8 The inner cylinder structure 30 can be designed as a split unit. In this embodiment, the guide outer wall 31 includes a front section 311 and a rear section 312. The rear section 312 is integrally formed with the rear end wall 318, and the front section 311 and the rear section 312 are connected by an insertion joint. Compared with the traditional one-piece molded inner cylinder structure, this split design has significant advantages in terms of simple structure and convenient assembly. In this embodiment, referring to the reference... Figure 3 and Figure 8 The inner cylinder structure 30 is divided into multiple spaces that allow airflow. A first air outlet cavity 35 is defined between the outer guide wall 31 and the inner guide wall 34. The inner guide wall 34 defines a second air outlet cavity 36 that is separated from the first air outlet cavity 35. An installation space 24 is defined between the rear end wall 318 of the inner cylinder structure 30 and the outer shell 21 of the air duct.

[0079] This document describes several embodiments of the present invention. However, for the sake of brevity, the descriptions of the embodiments are not exhaustive, and identical or similar features or parts between the embodiments may be omitted. In this document, "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to at least one embodiment or example applicable to the present invention, but not all embodiments. The above terms do not necessarily mean referring to the same embodiment or example. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0080] In this document, it should be understood that, unless otherwise expressly defined, the directional terms such as “center,” “axial,” “radial,” “circumferential,” “longitudinal,” “lateral,” “length,” “width,” and “thickness,” as well as spatial position terms such as “up,” “down,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” and movement direction terms such as “clockwise” and “counterclockwise”, are all relative orientations or positional descriptions defined based on the specific posture and orientation of the device shown in the accompanying drawings, and do not imply or limit that the device or element must have a certain orientation or be constructed or operated in a certain posture. Therefore, they should not be construed as limitations on this utility model.

[0081] The exemplary systems and methods of this invention have been specifically shown and described with reference to the foregoing embodiments, and are merely examples of the best mode for implementing the systems and methods. Those skilled in the art will understand that various changes can be made to the embodiments described herein without departing from the spirit and scope of this invention as defined in the appended claims when implementing the systems and / or methods.

Claims

1. A hair dryer (100), characterized in that, include: A handle (10) having an air inlet end (14); A duct (20) having an air outlet (22) is connected to the handle (10) to allow airflow from the handle (10) to enter the duct (20); The fan assembly (40) is housed in the handle; The handle (10) has multiple noise reduction holes (13) on its inner wall that are not through the outer wall.

2. The hair dryer according to claim 1, characterized in that, The plurality of noise reduction holes (13) are located upstream of the fan assembly (40) along the airflow direction and downstream of the air inlet end (14) along the airflow direction.

3. The hair dryer according to claim 1, characterized in that, The plurality of noise reduction holes (13) are disposed on the fluid channel between the air inlet end (14) and the fan assembly (40).

4. The hair dryer according to claim 1, characterized in that: The plurality of noise reduction holes (13) include multiple rows of noise reduction holes (13) spaced apart along the axial direction of the handle (10).

5. The hair dryer according to claim 4, characterized in that, At least one of the multiple rows of noise reduction holes (13) spaced apart along the handle (10) has a different hole size than the other rows of noise reduction holes (13).

6. The hair dryer according to claim 5, characterized in that, The multiple rows of noise reduction holes (13) spaced apart along the handle (10) have different hole sizes corresponding to different noise frequencies.

7. The hair dryer according to claim 1, characterized in that, The handle includes a handle outer shell (11) and a handle inner shell (12), wherein a handle inner cavity (17) is defined in the handle inner shell (12).

8. The hair dryer according to claim 7, characterized in that, The noise reduction hole (13) includes a through hole that penetrates the inner shell (12) of the handle.

9. The hair dryer according to claim 8, characterized in that, A gap space (16) is defined between the handle outer shell (11) and the handle inner shell (12), and the handle inner cavity (17) communicates with the gap space (16) through the plurality of through holes.

10. The hair dryer according to claim 8, characterized in that, The outer shell (11) of the handle and the inner shell (12) of the handle fit tightly together at the location of the noise reduction hole (13).

11. The hair dryer according to claim 8, characterized in that, The noise reduction hole (13) includes a countersunk hole in the handle housing (11) corresponding to the through hole.

12. The hair dryer according to claim 7, characterized in that, The noise reduction hole (13) includes a countersunk hole disposed in the inner shell (12) of the handle.

13. The hair dryer according to claim 9, characterized in that, The inner shell (12) of the handle also has a plurality of wiring holes (15), wherein the cable of the hair dryer (100) extends from the wiring holes (15) into the gap space (16) and is wired between the outer shell (12) of the handle and the inner shell (12).

14. The hair dryer according to any one of claims 1 to 13, characterized in that, The air duct (20) includes an outer shell (21) and an inner cylinder structure (30) housed in the outer shell (21). The inner cylinder structure (30) includes a flow-guiding outer wall (31), a flow-guiding inner wall (34), and a rear end wall (318). The rear end wall (318) connects the flow-guiding outer wall (31) and the flow-guiding inner wall (34). The outer guide wall (31) and the inner guide wall (34) define a first air outlet cavity (35), the inner guide wall (34) defines a second air outlet cavity (36) separated from the first air outlet cavity (35), and the rear end wall (318) of the inner cylinder structure (30) and the outer shell of the air duct (21) define an installation space (24). The outer wall of the guide (31) has a first fluid inlet (32) communicating with the first air outlet cavity (35) to allow airflow from the handle cavity (17) to flow into the first air outlet cavity (35); The rear end wall (318) has a second fluid inlet (361) communicating with the second air outlet cavity (36) to allow airflow from the mounting space (24) to flow into the second air outlet cavity (36); The rear end wall (318) also has at least one cooling fluid hole (33) communicating with the first air outlet cavity (35) to allow cooling airflow from the first air outlet cavity (35) to flow into the mounting space (24).

15. The hair dryer according to claim 14, characterized in that, An isolation section (211) is also formed between the air duct (20) and the handle (10) to isolate the mounting space (24) from the inner cavity (17) of the handle.

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