Diffuser and care appliance

Abstract

The utility model discloses a diffuser, include: casing have the intercommunication of air inlet end and air outlet end, the air inlet end with air outlet end form the fluid passage between, air outlet structure, locate air outlet end with a plurality of air outlet holes with the fluid passage intercommunication, locate the fluid passage in the flow guide piece, the flow guide piece has the arc body that protrudes to the air inlet end, wherein, the arc body in the projection of air inlet end center axis direction covers air inlet end. According to the diffuser of the utility model embodiment, the steady and soft air outlet can be provided, and the use experience of user is improved.

Description

Technical Field

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

[0002] Currently, hair drying devices are often equipped with diffusers to reduce the airflow velocity emitted from the device before it reaches the user's hair, thereby increasing the airflow coverage and improving the user's hair drying experience.

[0003] However, existing diffusers are still insufficient in guiding internal airflow. When the internal airflow flows, it is easy to cause a sharp change in direction, which adversely affects the airflow effect, resulting in unstable and not gentle airflow, and failing to provide users with a comfortable hair drying experience.

[0004] Therefore, there is an urgent need to provide a diffuser with an improved internal airflow path to obtain a smooth and gentle airflow to improve the user experience of care appliances.

[0005] 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

[0006] Therefore, the present invention aims to provide a diffuser for nursing devices that can solve at least one of the problems mentioned above, thereby improving the user experience of the diffuser.

[0007] In some embodiments of this utility model, a diffuser is provided, which may include:

[0008] The housing has an air inlet and an air outlet that are connected to each other, and a fluid channel is formed between the air inlet and the air outlet;

[0009] An air outlet structure is provided at the air outlet end and has multiple air outlet holes communicating with the fluid channel;

[0010] A flow guide is provided in the fluid channel, the flow guide having an arc-shaped body that protrudes toward the air inlet end;

[0011] The projection of the arc-shaped main body onto the central axis of the air inlet covers the air inlet.

[0012] In some embodiments, the arc-shaped body is provided with a plurality of arc-shaped notches extending inward along its circumferential edge, and a plurality of spaced guide petals are formed between adjacent arc-shaped notches.

[0013] In some embodiments, the plurality of arc-shaped notches are evenly arranged along the circumference of the arc-shaped body.

[0014] In some embodiments, the arcuate body is spaced apart from the housing in the circumferential direction.

[0015] In some embodiments, the arc-shaped body includes a plurality of support columns extending toward the air inlet end;

[0016] The housing includes a plurality of receiving portions corresponding to the support columns, wherein the support columns are connected to the housing to mount the flow guide to the housing.

[0017] In some embodiments, the plurality of air outlets are arranged in an array, wherein the air outlet structure further includes at least one sealing portion for closing at least a portion of the air outlets.

[0018] In some embodiments, the air outlet structure has a protruding air guide column, and the closure portion is at least partially disposed around the air guide column.

[0019] In some embodiments, the air outlet structure includes one or more sets of annularly arranged air guide columns, at least one set of air guide columns being surrounded by the corresponding plurality of enclosed portions.

[0020] In some embodiments, the air guide columns include a first set of air guide columns located on the outside and a second set of air guide columns located on the inside, wherein at least a portion of the corresponding closure portion is arranged around the first set of air guide columns.

[0021] In some embodiments, in the projection of the closure portion and the guide member along the central axis of the air outlet structure, the closure portion is located outside the guide member.

[0022] In some embodiments, the housing includes an inner shell and an outer shell, with a cavity formed between the inner shell and the outer shell.

[0023] In some embodiments of this utility model, a diffuser is also provided, which may include:

[0024] The housing has an air inlet and an air outlet that are connected to each other, and a fluid channel is formed between the air inlet and the air outlet;

[0025] An air outlet structure is provided at the air outlet end and has multiple air outlet holes communicating with the fluid channel;

[0026] The plurality of air outlets are arranged in an array, and the air outlet structure further includes at least one sealing part for at least sealing a portion of the air outlets.

[0027] In some embodiments, the air outlet is a circular hole, and an air guide column protrudes from the air outlet structure, wherein at least a portion of the closure portion is arranged around at least a portion of the air guide column.

[0028] In some embodiments, the air outlet structure includes one or more sets of annularly arranged air guide columns, wherein at least a portion of the enclosure is arranged around at least one set of air guide columns.

[0029] In some embodiments, the air guide columns include a first set of air guide columns located on the outside and a second set of air guide columns located on the inside, wherein at least a portion of the corresponding closure portion is arranged around the first set of air guide columns.

[0030] In some embodiments, the closure portion is characterized by forming a boss.

[0031] In some embodiments, the diffuser further comprises:

[0032] A flow guide is provided in the fluid channel, the flow guide having an arc-shaped body that protrudes toward the air inlet end.

[0033] In some embodiments of the present invention, a nursing device is also provided, which may include the diffuser described in the embodiments of the present invention.

[0034] According to the present invention, the diffuser, by means of a guide member with an arc-shaped body, enables the high-speed airflow entering the diffuser to smoothly transition with the guidance of the arc-shaped body. This design effectively reduces the streamline curvature gradient, avoids phenomena such as abrupt turns, accelerations or decelerations of the airflow, effectively avoids the generation of unstable eddies and turbulence, and reduces the amplitude of pressure pulsations. Thus, on the one hand, it improves the uniformity of airflow distribution, providing a stable and gentle airflow; on the other hand, it improves the airflow efficiency by reducing flow losses, and also avoids the airflow impacting the diffuser wall due to abrupt changes in direction, reducing the aerodynamic noise level of the diffuser, and comprehensively improving the overall performance of the diffuser and the user experience.

[0035] 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

[0036] 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:

[0037] Figure 1 This is a first exemplary perspective view of a diffuser according to an embodiment of the present invention;

[0038] Figure 2 This is a second exemplary perspective view of a diffuser according to an embodiment of the present invention;

[0039] Figure 3 This is a first exemplary top view of a diffuser according to an embodiment of the present invention;

[0040] Figure 4 This is a first exemplary exploded view of a diffuser according to an embodiment of the present invention;

[0041] Figure 5 This is a second exemplary exploded view of a diffuser according to an embodiment of the present invention;

[0042] Figure 6 This is one of the first exemplary side cross-sectional views of the diffuser according to an embodiment of the present invention;

[0043] Figure 7 This is a second exemplary side cross-sectional view of the diffuser according to an embodiment of the present invention;

[0044] Figure 8 This is an exemplary side cross-sectional view of the air outlet structure of the diffuser according to an embodiment of the present invention;

[0045] Figure 9 This is a second exemplary top view of a diffuser according to an embodiment of the present invention, showing the outline of the air inlet and the outline of the air guide.

[0046] Figure 10(a) is an exemplary top view of the flow guide of the diffuser according to an embodiment of the present invention;

[0047] Figure 10(b) is an exemplary bottom view of the flow guide of the diffuser according to an embodiment of the present invention.

[0048] Figure label:

[0049] 100. Diffuser;

[0050] 10. Housing; 11. Air inlet; 12. Air outlet; 13. Inner housing; 131. Receiving part; 132. First mounting part; 133. First limiting protrusion; 14. Outer housing; 142. First mating part; 143. First limiting rib; 144. Second mating part; 15. Cavity;

[0051] 20. Air outlet structure; 21. Air outlet hole; 22. Air guide column; 221. First group of air guide columns; 222. Second group of air guide columns; 23. Enclosure; 24. Boss; 25. Air outlet; 26. Reinforcing spokes; 27. Inner ring area; 28. Outer ring area; 29. ​​Second mounting part;

[0052] 30. Flow guide; 31. Arc-shaped main body; 32. Arc-shaped notch; 33. Flow guide flap; 34. Support column. Detailed Implementation

[0053] 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.

[0054] 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.

[0055] As mentioned earlier, current diffusers used in nursing devices are insufficient in guiding internal airflow. The internal airflow is prone to abrupt changes in direction, negatively impacting the airflow effect and resulting in uneven and less gentle airflow, thus reducing the user experience. To address this, this invention provides a nursing device 100 that offers more stable and gentler airflow and lower noise levels.

[0056] In some embodiments of this utility model, reference is made to Figures 1 to 10(a) Figure 10(b) shows a diffuser 100, which may include a housing 10, an air outlet structure 20, and a flow guide 30.

[0057] In some embodiments, reference Figure 1 and Figure 2 The housing 10 may have an air inlet 11 and an air outlet 12 that are connected to each other, forming a fluid channel between the air inlet 11 and the air outlet 12. In this embodiment, the air inlet 11 may be used, for example, to connect to the airflow outlet of a hair dryer, hair dryer or other care appliance to receive airflow from the care appliance into the diffuser 100 and flow to the air outlet 12 via the fluid channel in the diffuser.

[0058] In some embodiments of this utility model, reference is made to Figure 4 and Figure 5 The housing 10 may include an outer shell 13 and an inner shell 14. In this embodiment, referring to reference... Figure 1 , Figure 2 , Figure 4 and Figure 5The outer casing 13 can be integrally funnel-shaped, with its constricted end forming the air inlet 11 and its flared end forming the air outlet 12. In this embodiment, on the one hand, this design allows the airflow entering the air inlet 12 to gradually diffuse along the expanding cross section of the casing 10 during the flow process, forming a continuous velocity gradient transition region, reducing momentum loss caused by abrupt changes in airflow and its impact on the system. At the same time, the deceleration process of the airflow during diffusion can effectively reduce the generation of eddies and reduce turbulence intensity, thereby making the airflow distribution more uniform. On the other hand, this design reduces pressure loss during the flow process. Specifically, compared to a suddenly expanding flow channel, this design adopts a gradually expanding cross section structure. The outer casing 10 avoids drastic pressure difference changes during airflow diffusion, avoiding pressure drop when the airflow passes through sharp turns or contractions. Therefore, the overall system pressure loss is significantly reduced, thereby not only improving airflow transmission efficiency but also reducing the burden on the power source.

[0059] In some embodiments, continue to refer to Figure 4 and Figure 5 The inner shell 14 is shaped to match the outer shell 13, exhibiting a shape that gradually expands from the air inlet 11 to the air outlet 12, but is slightly smaller in size than the outer shell 13, thus forming a cavity 15 between the inner shell 14 and the outer shell 13. In this embodiment, the cavity 15 formed between the inner shell 14 and the outer shell 13 functions as a noise isolation structure during airflow. Specifically, since airflow often generates a certain amount of aerodynamic noise when entering and exiting the system, the cavity 15 can effectively block the propagation path of the noise waves, attenuate the sound wave energy, and weaken or eliminate the reflection and propagation of noise, thereby reducing the overall noise level of the diffuser 100. In addition, the cavity 15 between the inner shell 14 and the outer shell 13 can also serve as a thermal insulation structure. When the diffuser 100 receives high-temperature airflow from the nursing device, the cavity 15 can effectively block the transfer of heat, reduce the direct impact of the high-temperature airflow on the surface of the outer shell 13, and improve safety and comfort during use.

[0060] In some embodiments, the inner side of the outer shell 14 may be provided with a first mating portion 142, and the inner shell 13 may be provided with a first mounting portion 132 that mates with the first mating portion 142. The first mounting portion 132 mates with the first mating portion 142 to install the inner shell 13 inside the outer shell 14. In this embodiment, the first mating portion may include a support platform extending inward from the inner wall of the outer shell 14 to support the inner shell 13 axially. The support platform provides reliable axial support force for the inner shell 13, suppressing axial displacement and vibration of the inner shell under the impact of airflow. At the same time, the outer shell 14 may also be provided with a first limiting rib 143, and the inner shell 13 may be provided with a first limiting protrusion 133 that mates with the limiting rib. The two cooperate to prevent the inner shell 13 from rotating circumferentially inside the outer shell 14. This design helps to provide and maintain a uniform cavity 15 and ensure the consistency of sound insulation and heat insulation effects.

[0061] In other embodiments, the housing 10 may also be manufactured using a one-piece molding process, and the housing 10 may have a double-wall structure, that is, a hollow cavity 15 is formed between the inner wall and the outer wall of the housing 10. In this embodiment, the cavity 15 may be formed, for example, by means of gas-assisted injection molding. In this embodiment, the one-piece molded housing 10 can maintain the same sound insulation and heat insulation effect as the double-shell structure, but with higher structural strength, better overall sealing, simplified assembly process, and reduced risk of loosening or deformation during long-term use. The embodiments of the present invention will be further described below in conjunction with the housing 10 including the outer shell 13 and the inner shell 14.

[0062] In some embodiments of this utility model, reference is made to Figures 4 to 7 The guide 30 is disposed in the fluid channel between the air inlet 11 and the air outlet 12, and has an arc-shaped body 31 protruding toward the air inlet 11, so that the arc-shaped body 32 can guide the fluid from the air inlet 11 to the air outlet structure 20.

[0063] In some embodiments, reference Figure 6 and Figure 7 The direction of fluid flow inside the diffuser 100 is schematically shown by arrows. In this embodiment, referring to the reference... Figure 9 and Figure 6 and Figure 7 The arc-shaped main body 31 is generally U-shaped, and the projection of the arc-shaped main body 31 onto the central axis of the air inlet 11 at least partially, and optionally completely, covers the air inlet 11 (in...). Figure 9The air inlet 11 is shown as a circular dashed line. The airflow entering from the air inlet 11 first contacts the arc-shaped body 31 and is guided by the arc-shaped body 31 to flow through the guide member 30. This prevents the airflow from entering from the air inlet 11 from flowing directly to the air outlet 12 without guidance and diffusion, thus preventing the formation of a high-speed airflow. This helps ensure that the airflow reaching the air outlet 12 is fully diffused. Because the arc-shaped body 31 can guide the airflow to be evenly distributed, the airflow is gradually diffused and softened as it flows through the arc-shaped body 31. Through this fluid guidance mechanism, the airflow can achieve sufficient diffusion and even distribution before flowing to the air outlet 12, effectively avoiding localized airflow concentration, reducing airflow impact, and ensuring that the airflow reaching the user has a smooth and gentle characteristic. By way of explanation and not limitation, this smooth and gentle airflow output is particularly important for applications requiring gentle and slow airflow (such as voluminous hair). In this embodiment, the flow-guiding structure of the arc-shaped main body 31 of the flow guide 30 allows the airflow entering the diffuser 100 to smoothly change direction and speed during flow. Through the smooth arc-shaped flow-guiding structure, the airflow can flow along a gradually changing curvature path without experiencing sudden turns or drastic changes such as acceleration or deceleration. This design avoids sudden airflow instability, effectively suppresses the occurrence of eddies and turbulence, and ensures airflow stability and flow field uniformity. Simultaneously, through the ingenious design of the arc-shaped main body 31, the diffuser 100 ensures uniform and stable airflow diffusion while avoiding noise generated by airflow instability or violent collisions with the equipment wall, further achieving a noise reduction effect.

[0064] In some embodiments, continue to refer to Figure 6 and Figure 7The arc-shaped main body 31 is spaced apart from the shell 10, especially circumferentially, thus defining a circumferential flow channel between the arc-shaped main body 31 and the shell 10. This allows airflow to be guided and diffused between the flow guide 30 and the shell 10. Specifically, a predetermined distance is maintained between the arc-shaped main body 31 and the air inlet 11 circumferentially, and the circumferential distance between the arc-shaped main body 31 and the inner surface of the inner shell 14 gradually increases from the direction of the air inlet 11 (the top area of ​​the arc-shaped main body 31) to the direction of the air outlet 12 (the circumferential edge area of ​​the arc-shaped main body 31). This variable cross-section design, which gradually expands along the airflow direction, forms an expanding flow channel. As the airflow flows along the flow channel between the arc-shaped main body 31 and the inner shell 14, the airflow gradually decelerates within the flow channel and is uniformly diffused through the expansion effect of the variable cross-section channel. This airflow deceleration process avoids the flow noise and uneven distribution that may occur when the airflow enters the air outlet 12 too quickly, thus ensuring the stability and uniformity of the airflow. Therefore, as the airflow flows along the guide channel between the arc-shaped main body 31 and the inner shell 14 towards the air outlet 12, the airflow slows down and diffuses evenly within the guide channel, thus avoiding turbulence and noise caused by sudden changes in airflow. This results in a more uniform speed and temperature distribution at the air outlet 12, providing a more comfortable user experience. In this embodiment, after passing through the expanding guide channel, the airflow forms a more uniform airflow speed and temperature distribution upon reaching the air outlet 12. This is crucial for user comfort. For example, in practical applications, this flow field characteristic allows users to enjoy a gentle and uniform diffused airflow, effectively avoiding the discomfort caused by uneven or excessively fast airflow in traditional designs, and improving the comfort of using the nursing device.

[0065] In some embodiments of this utility model, reference is made to Figures 4 to 7As shown in Figures 10(a) and 10(b), the arc-shaped body 31 may have multiple arc-shaped notches 32 extending inward from its circumferential edge, with multiple guide vanes 33 defined between adjacent arc-shaped notches 32. These guide vanes 33 are, for example, spaced apart. In this embodiment, the combined structure of the arc-shaped notches 32 and the guide vanes 33 provides a combined airflow regulation effect. Specifically, the guide vanes 33 can guide a portion of the airflow to flow smoothly along its arc-shaped surface, generating a directional airflow guiding effect. During the flow, the airflow is guided by the arc-shaped surface of the guide vanes 33, avoiding disordered airflow and thus reducing turbulence. This orderly airflow reduces airflow instability, thereby reducing noise generated by the airflow and optimizing the overall flow field stability. Simultaneously, the presence of the guide vanes 33 allows the airflow to be dispersed and guided when it collides with the arc-shaped body 31, avoiding noise and energy loss caused by the airflow directly impacting the inner wall of the shell. Through this dispersion and guidance, the airflow will not generate high-intensity impact, reducing wall vibration and noise radiation, and further optimizing the noise performance of the diffuser 100.

[0066] In some embodiments, reference Figure 6 and Figure 7 The arc-shaped gaps 32 between the guide vanes 33 also form supplementary airflow channels, allowing some airflow to flow through these gaps towards the central region of the arc-shaped body 31. Specifically, when the airflow flows around the arc-shaped body 31, a relatively low-pressure area often forms in the central region of the arc-shaped body 31. The resulting pressure gradient can effectively guide the wall airflow to supplement the low-pressure central region through the arc-shaped gaps 32, forming a supplementary airflow path, thereby balancing the pressure distribution of the entire flow field. This design allows the airflow to be more uniform when flowing through the arc-shaped body 31, avoiding the formation of large-scale vortex structures caused by an excessively large central low-pressure area, significantly suppressing turbulence generation, and thus reducing airflow noise. Furthermore, the combined design of the guide vane 33 and the arc-shaped notch 32 can also generate a synergistic effect as the airflow flows along the arc-shaped body 31: the guide vane 33 is responsible for guiding and dispersing the main flow, while the arc-shaped notch 32 is responsible for the central replenishment and pressure balance of the airflow. This complementary functional allocation ensures the stability and uniformity of the entire airflow field, further optimizing the acoustic performance and airflow distribution effect of the diffuser 100. Ultimately, the airflow flowing through the diffuser is distributed smoothly and evenly, thereby enhancing the comfort of the airflow and the user experience. In some embodiments of this utility model, increasing the depth of the arc-shaped notch 32 is beneficial for enhancing the replenishment effect of the airflow towards the central region of the arc-shaped body 31, which can more effectively balance the pressure distribution in the central low-pressure region and further reduce the formation of vortex structures.

[0067] In some embodiments of this utility model, reference is made to Figure 9The arc-shaped notch 32 is configured such that when viewed along the axial direction of the air inlet 11, the lowest end of the arc-shaped notch 32 is located in the outer region of the air inlet 11. This helps to ensure that the high-speed airflow entering from the air inlet 11 does not rush directly to the air outlet 12 through the arc-shaped notch 32 without being guided by the arc-shaped body 31. Instead, it first contacts the arc-shaped surface of the arc-shaped body 31 on the side close to the air inlet 11. Then, the high-speed airflow flows along the arc-shaped surface and gradually decelerates and adjusts its flow direction during the flow process. This avoids the direct high-speed airflow flowing to the air outlet 12 without deceleration and direction adjustment, and ensures that the airflow flows evenly and stably to the air outlet 12 and is discharged. As an explanation and not a limitation, in real-world scenarios such as frizzy hair, a high-speed direct airflow may blow up the user's hair that is in contact with the diffuser's outlet, thus reducing the hair care effect of the diffuser 100. This embodiment of the invention, through the targeted design of the arc-shaped notch 32, ensures that the airflow to the outlet 12 is decelerated and uniform, avoiding the noise increase and uneven airflow distribution that may be caused by direct airflow. This helps the outlet 12 output a gentle and slow airflow for the user to care for their hair, further optimizing the overall performance and user experience of the diffuser 100.

[0068] In other embodiments, the arc-shaped body 31 may be constructed as an arc-shaped grille with multiple through holes. In this embodiment, the arc-shaped body 31 may have a blocking portion to block part of the through holes to form a blocking area, thereby guiding the airflow from the air inlet 11 through the blocking area, while simultaneously replenishing the low-pressure center region of the arc-shaped body 31 with air through the multiple through holes between the blocking areas, thus ensuring the stability and uniformity of the entire airflow field, optimizing the acoustic performance and airflow distribution effect of the diffuser 100, and ensuring that the air outlet 12 has a uniform and stable airflow.

[0069] In other embodiments, the outer edge of the guide vane 33 may also be designed to bend further toward the housing 10 and extend to contact the inner surface of the housing 10 (e.g., the inner surface of the inner shell 14). In this embodiment, multiple through holes may be provided within a predetermined distance of the guide vane 33 near the housing 10. Thus, after the airflow is guided through the guide vane 33 and the guide channel of the inner shell 14, it can be further homogenized by means of the through holes, thereby achieving effective control of the airflow speed and direction, and further reducing turbulence and noise.

[0070] In some embodiments of this utility model, reference continues to be made. Figure 6 , Figure 7As shown in Figures 10(a) and 10(b), multiple arc-shaped notches 32 are evenly arranged circumferentially along the arc-shaped main body 31. In some embodiments, the number of arc-shaped notches 32 is three, and three guide vanes 33 are defined between the arc-shaped notches 32, so that the arc-shaped main body 31 as a whole forms a clover-like structure with circumferential symmetry. In this embodiment, the three guide vanes 33 are evenly distributed at 120°, and the central angle of each guide vane 33 is 60°, thereby achieving a balance of airflow on the outer and inner sides. In particular, it is beneficial for the airflow to fully and evenly replenish the central low-pressure area of ​​the arc-shaped main body 31. The circumferential symmetry of the multiple arc-shaped notches 32 avoids regional pressure unevenness in the flow field, making the pressure field in the central area more balanced and the vortex structure smaller to further reduce the noise level. In one specific embodiment, this clover-shaped airflow design, compared to full U-shaped, elliptical, and double-layer teardrop-shaped airflow structures, can reduce noise by approximately 0.5 dBA while providing a more uniform airflow distribution, significantly improving hair drying performance and user experience. However, it is understood that in other embodiments, the number of arc-shaped notches 32 and the number of airflow guide petals 33 can be greater than three. For example, four arc-shaped notches 32 can be provided, thereby defining four airflow guide petals 33. The four airflow guide petals 33 are evenly distributed at 90° intervals, and the central angle of each airflow guide petal 33 is 45°, thus forming a clover-like structure on the entire arc-shaped body 31. It should be understood that in other embodiments, an even greater number of airflow guide petals 33 and arc-shaped notches 32 can be provided, and this invention does not limit this.

[0071] In some embodiments of this utility model, reference is made to Figures 4 to 7The arc-shaped main body 31 may include a plurality of support columns 34 extending toward the air inlet end 11, and the inner surface of the inner shell 14 may be provided with a plurality of receiving portions 131 corresponding to the support columns 34. In this embodiment, the receiving portions 131 may at least partially, or optionally all of them, correspond one-to-one with the positions of the support columns 34, and the support columns 34 may engage with the receiving portions 131 to install the guide member 30 onto the housing 10. In some embodiments, the receiving portion 131 may include a reinforcing rib structure protruding inward from the inner surface of the inner shell 14, the upper part of which forms a platform-shaped support surface and is provided with mounting holes or mounting grooves for engaging and connecting with the support columns 34. Therefore, unlike the conventional installation method of traditional diffusers 100 which uses peripheral connection or direct attachment to the inner wall, this embodiment of the utility model innovatively designs a support column 34 extending from the arc-shaped body 31, so that the guide element 30 can be stably "suspended" in the fluid channel, that is, it does not need to be supported by the inner wall of the inner shell 13. This helps to define a circumferential flow channel between the guide element 30 and the inner shell 13 to guide and diffuse the airflow. In some embodiments, the number of support columns 34 can correspond to the number of guide petals 33. For example, in a clover-shaped design, the number of support columns 34 can be three, each extending from each guide petal 33 towards the air inlet 11, forming a three-point support structure. This ensures the positional stability of the arc-shaped body 31 in the fluid channel and avoids adverse vibration of the arc-shaped body 31 when it is impacted by airflow, ensuring a stable flow guiding effect. In some embodiments, the support column 34 can also be set as a hollow column, which can provide sufficient support strength and reduce the overall weight of the diffuser, further improving the user experience.

[0072] In other embodiments of this utility model, it should be noted that the diffuser 100 may also include a housing 10 and an air outlet structure 20, but does not include the guide element 30 described in the above embodiments. This may be advantageous in situations where it is necessary to control the overall volume of the diffuser or to install other components inside the diffuser.

[0073] In some embodiments of this utility model, reference is made to Figures 1 to 8 The air outlet structure 20 can be provided at the air outlet end 12 of the housing 10. The air outlet structure 20 can be provided with multiple air outlet holes 21 that communicate with the fluid channel inside the diffuser 100, so that the airflow in the fluid channel of the diffuser 100 can at least partially flow out of the diffuser 100 through the multiple air outlet holes 21.

[0074] In some embodiments, reference Figure 6 as well as Figure 7After the inner shell 13 is installed into the outer shell 14, the air outlet structure 20 can be further installed onto the air outlet end 12 of the outer shell 14. In this embodiment, the air outlet structure 20 may be provided with a second mounting portion 29, and the air outlet end 12 of the outer shell 14 is provided with a second mating portion 144 that cooperates with the second mounting portion 29. The second mounting portion 29 and the second mating portion 144 cooperate to fix the air outlet structure 20 onto the outer shell 14. In some embodiments, one of the second mounting portion 29 and the second mating portion 144 is provided as a hook, and the other is provided as a slot that cooperates with the hook. Multiple hooks and slots can be provided one-to-one, making the connection more reliable. In this embodiment, when the air outlet structure 20 is installed onto the outer shell 14, the engagement of the hook and the slot not only fixes the air outlet structure 20 onto the outer shell 14, but also applies appropriate axial pressure to the inner shell 13, achieving a tight connection of the three-piece structure. It should be understood that the arrangement of the first mounting portion 132 and the first mating portion 142, as well as the second mounting portion 29 and the second mating portion 144, is not limited to one of the above-described forms. In another embodiment, these connection structures may also be configured as mutually mating convex bulges and grooves, or as interference fits, to meet different production process requirements and structural strength requirements.

[0075] In some embodiments, reference Figures 3 to 5 Multiple air outlets 21 are arranged in a ring array and optionally are circular holes. The air outlet structure 20 includes at least one sealing portion 23 for at least partially sealing the air outlets 21. In this embodiment, this design of partially sealing the air outlets 21 breaks the periodic arrangement pattern of traditional diffuser air outlet structures, thereby helping to reduce the overall noise of the air outlet structure 20 and the diffuser 100. For illustrative purposes, and not as limiting, traditional air outlet structures 20 typically have uniformly distributed small holes, which easily form a periodic structure. When high-speed airflow passes through the periodically arranged small holes, the air column in the small holes is prone to form air column resonance at a specific frequency, such as structural acoustic resonances like Helmholtz resonance, leading to noticeable howling or resonant noise. In this embodiment, the irregular sealing portion 23 breaks this frequency uniformity of the air column vibration in the air outlets 21, preventing uniformly distributed holes from forming miniature resonators of the same frequency, thereby effectively suppressing noise amplification at specific frequencies and reducing the noise level of the diffuser.

[0076] In some embodiments of this utility model, reference is made to Figure 6 and Figure 7In the projection of the sealing portion 23 and the guide member 30 along the central axis of the air outlet structure 20, the sealing portion 23 is located outside the guide member 30. In other words, in this embodiment, the blocked air outlet holes 21 are mainly distributed in the outer region of the air outlet structure 20, especially in the outer region of the arc-shaped body 31 of the guide member 30. Thus, this design takes into account that the effect of the guided fluid makes the fluid impact the outer grille larger, which is more likely to cause unstable eddies and turbulence. Therefore, by partially blocking the small holes on the outside, the density of small holes in the outer region can be reduced, which can effectively avoid the large and strong pressure pulsation and turbulence noise caused by the direct impact of the airflow on the holes, and can also improve the stability and uniformity of the outflowing airflow.

[0077] In some embodiments, the air outlet 21 has a gradually expanding conical design, with its flow cross-sectional area gradually increasing from the air inlet 11 to the air outlet 12. This conical air outlet structure allows the airflow to diffuse further within the air outlet 21, thereby helping to reduce noise and provide users with a more uniform and gentle airflow output.

[0078] In some embodiments, multiple closures 23 may be distributed at equal angular intervals around the central axis of the air outlet structure 20. In this embodiment, the closure 23 should be interpreted broadly, including closures formed by blocking a single air outlet 21, as well as closures (regions) formed by blocking multiple adjacent air outlets 21. Thus, the arrangement of the closures 23 can break the traditional periodic structure of the air outlets 21 without significantly affecting the airflow of the air outlet structure 20, thereby avoiding structural acoustic resonance noise generated under high-speed airflow. At the same time, the blocked air outlets 21 and the closures 23 can act as acoustic reflection areas to reflect noise. Specifically, when noise waves present in the diffuser 100 encounter the closures 23, they are forced to change their propagation path, increasing the propagation distance and number of propagation times of the noise waves inside the diffuser 100, forming more refraction and reflection, thereby gradually dissipating the energy of the noise waves internally through multiple reflections, reducing the magnitude of the noise propagating outward, and lowering the noise level perceived by the user.

[0079] In some embodiments, the closure 23 can be integrally formed with the air outlet structure 20. That is, during the injection molding process of the air outlet structure 20, a portion of the area that should have formed the air outlet 21 is directly designed as a solid structure to form an integrated closure 23. In this embodiment, this integral molding method has the advantages of structural stability and high production efficiency, making it suitable for mass production scenarios, and it does not generate additional assembly steps and process costs.

[0080] In other embodiments, the closure 23 can also be designed as a separate component independent of the air outlet structure 20 and installed onto the air outlet structure 20. For example, the closure 23 can be designed as a sealing element that matches the shape of the air outlet 21, and fixed to a predetermined area of ​​the air outlet structure 20 by means of adhesive bonding or thermoforming. In this embodiment, this split design provides greater design flexibility and production adjustment space, allowing manufacturers to adjust the number, position, and shape of the closure 23 according to the acoustic characteristics requirements of different product models without changing the overall mold of the air outlet structure 20, which is beneficial for product iteration optimization and cost control.

[0081] In some embodiments, non-adjacent closed portions 23 may be randomly distributed on the air outlet structure 20, thereby further disrupting the regular arrangement of the air outlet holes 21 to further avoid the generation of structural acoustic resonance, thereby reducing the noise level of the diffuser 100.

[0082] In some embodiments of this utility model, reference is made to Figures 1 to 8 The air outlet structure 20 may have a protruding air guide column 22. In this embodiment, the air guide column 22 is, for example, a column-shaped structure protruding from the surface of the air outlet structure 20, and may be used, for example, to contact the user's hair and guide the airflow to be evenly distributed in the outer surface area of ​​the air outlet structure 20.

[0083] In some embodiments, reference Figure 6 and Figure 7 An air guide column 22 may have an air guide channel 24 formed inside, which is connected to the fluid channel inside the diffuser 100. One or more air outlets 25 are provided at the top of the air guide column 22 to optimize the distribution of the outflowing airflow. In some embodiments, the air outlet 234 may be designed as an ellipse or an elongated slit. Thus, a flat, fan-shaped airflow can be generated by the air outlet 234, increasing the airflow coverage area, thereby achieving a more uniform diffusion effect in conjunction with the air outlet 21 on the air outlet structure 20, enhancing the user experience.

[0084] In some embodiments of this utility model, reference is made to the following: Figure 6 , Figure 7 and Figure 9 The arc-shaped notch 32 is configured such that when viewed along the axial direction of the air inlet 11, the lowest end of the arc-shaped notch 32 is located in the outer region of the air inlet 11. This helps to ensure that the high-speed airflow entering from the air inlet 11 does not directly rush towards the air outlet structure 20 through the arc-shaped notch 32 without being guided by the arc-shaped body 31. This avoids the reduction of the hair care effect of the diffuser 100 due to the direct airflow blowing up the user's hair in contact with the air outlet structure 20. It also avoids the noise increase and uneven airflow distribution that may be caused by the direct airflow, further optimizing the overall performance and user experience of the diffuser 100.

[0085] In some embodiments of this invention, at least a portion of the sealing portion 23 may be disposed around at least a portion of the air guide column 22. In this embodiment, a plurality of air outlets 21 within a predetermined range around at least a portion of the air guide column 22 are blocked, forming the sealing portion 23 around the air guide column 22. In this embodiment, for example, the air outlets 21 within a range of 1 to 2 times the diameter of the air outlets 21 around the air guide column 22 are blocked, thereby forming the sealing portion 23 around the air guide column 22. In some embodiments, the air outlets 21 directly adjacent to the air guide column 22 may also be blocked, forming the sealing portion 23 around the air guide column 22. Thus, multiple enclosed sections 23 surrounding the air guide column 22 form a closed area around the air guide column 22. This design not only breaks the uniform and regular arrangement of the air outlets 21 near the air guide column 22, thereby avoiding the generation of structural acoustic resonance, such as avoiding the acoustic resonance noise caused by the Helmholtz resonance phenomenon of the air column in the uniformly and regularly arranged air outlets, but also suppresses the formation of noise in the air outlet structure 20. At the same time, the closed area formed by the multiple enclosed sections 23 around the air guide column 22 forms a large reflection area towards the inside of the diffuser 100. When the noise sound waves inside the diffuser come into contact with the reflection area formed by these enclosed sections 23, strong reflection will occur. These reflection areas force the noise sound waves to change their propagation path, propagate towards the inner wall of the diffuser, and form multiple reflections with the diffuser shell and gradually lose energy. Combined with the noise isolation structure formed by the aforementioned double shell, the propagation of noise inside the diffuser shell to the outside is avoided as much as possible, and the noise level of the diffuser 100 is comprehensively reduced. Furthermore, this structural design also contributes to improving the structural strength of the air outlet structure 20. As an explanation rather than a limitation, based on drop test data, when the diffuser 100 is accidentally dropped, the air guide column 22 tends to contact the ground first and therefore has a greater risk of damage, such as breakage, compared to structures like the housing 10. Moreover, due to the structural characteristics of the air guide column 22, the breakage of the air guide column 22 during a drop often occurs at the root where the air guide column 22 contacts the air outlet structure 20, rather than at other parts. Therefore, it is beneficial to strengthen the root of the air guide column 22. By sealing the air outlet holes 21 around the air guide column 22 to form a closed area around the air guide column 22, the effective wall thickness at the root of the air guide column 22 can be increased. On the one hand, this improves the impact resistance, and on the other hand, it mechanically changes the stress distribution and reduces stress concentration, thereby comprehensively improving the drop resistance of the air guide column 22, enhancing the overall structural strength of the diffuser 100, and improving its service life and user experience.

[0086] In some embodiments of this utility model, reference is made to Figures 3 to 7 The air outlet structure 20 may include one or more sets of annularly arranged air guide columns 22, wherein at least a portion of the enclosed portion 23 is disposed around at least one set of air guide columns 22. In some embodiments, continuing... Figures 3 to 7The air guide column 22 may include a first set of air guide columns 221 located on the outside and a second set of air guide columns 222 located on the inside. Thus, the arrangement of the two sets of annular air guide columns forms a multi-layered airflow distribution system, which effectively improves the uniformity of airflow distribution on the outside of the air outlet structure, improves the uniformity of airflow and the drying effect, and enhances the user experience.

[0087] In this embodiment, reference Figures 3 to 7At least a portion of the corresponding closed portion 23 is arranged around the first set of guide columns 221. In this embodiment, the corresponding closed portion 23 includes, for example, a closed portion 23 within a predetermined range around the guide columns, for example, within a range of 1 to 2 times the diameter of the air outlet 21. Thus, a differentiated design is formed for the outer first guide column 221. Explained, but not limited, due to centrifugal effect and flow channel characteristics, the airflow velocity in the diffuser 100 is usually higher, the flow is more turbulent, and the turbulence intensity is greater when the airflow reaches the air outlet structure 20 near the outer region of the air outlet structure 20. In response, this differentiated design, by sealing part of the air outlet 21 around the first set of guide columns 221 (i.e., the outer set of guide columns) to form a closed portion 23, can effectively reduce the airflow outlet density in these areas, reduce the possibility of airflow directly impacting the air outlet 21, and thus reduce the adverse aerodynamic noise generated by airflow impacting the air outlet 21. Meanwhile, as an explanation rather than a limitation, due to centrifugal effect and flow channel characteristics, the airflow within the diffuser 100 typically has a higher velocity near the outer region of the outlet structure 20 when it reaches the outlet structure 20, resulting in more turbulent flow and greater turbulence intensity. Furthermore, these outer airflows are more likely to generate aerodynamic noise when passing through the outlet holes 21, and the outer outlet holes are more prone to Helmholtz resonance under high-speed airflow, leading to noise wave superposition and amplification. In this embodiment, by sealing the outlet holes 21 around the first set of guide columns 221 (i.e., the outer set of guide columns) to form a closed section 23, the airflow outlet density in these areas can be effectively reduced, decreasing the possibility of airflow directly impacting the outlet holes 21, thereby reducing the adverse aerodynamic noise generated by airflow impacting the outlet holes 21. Simultaneously, this differentiated design also optimizes the overall airflow distribution, making the airflow more uniform and avoiding excessive blowing of the user's hair by the strong airflow in the outer region, providing a uniform and gentle airflow output and improving the user experience. Furthermore, as mentioned above, since the diffuser 100 may fall off during daily use, and the outer area of ​​the air outlet structure 20, especially the outer position of the first set of guide columns 221, is often the first part to contact the ground, by forming a closed portion 23 around the first set of guide columns 221, the root strength of the first set of guide columns 221 is effectively improved, reducing the risk of breakage or deformation under impact. The above structural design takes into account airflow optimization, noise control, structural reinforcement, and safety of use, significantly improving the overall performance and reliability of the diffuser 100. In some embodiments, refer to Figures 3 to 7The closure 23 can protrude upwards on the outer surface of the air outlet structure 20 to form a boss 24. This boss 24 configuration further enhances the structural strength of the root of the air guide column 22 while retaining the fluid control function of the closure 23, and is easy to demold. In some embodiments, the boss 24 can extend outward to the outer edge of the air outlet structure 20, thereby forming a continuous reinforcing beam structure. In a specific embodiment, the height of the boss 24 is, for example, 0.5 mm. Through this design of the closure 23 and the boss 24, when the diffuser 100 falls to the ground, the impact force on the air guide column 22 is dispersed to a larger area of ​​the air outlet structure 20 by the continuous area formed around the air guide column 22 by the closure 23 and the boss 24, thereby significantly reducing the local impact stress on the air guide column 22, especially its root, further improving the drop resistance of the air outlet structure 20 and extending the service life of the diffuser 100.

[0088] In some embodiments of this utility model, reference is made to Figure 9 Viewed along the axial direction of the air inlet 11, the arc-shaped body 31 may have an arc-shaped notch 32 that is tangent or approximately tangent to the edges of the second set of air guide columns 222. In this embodiment, referring to... Figure 9 The diagram shows a top view along the axis of the air inlet 11, illustrating the outline of the arc-shaped main body 31 under the air outlet structure 20. The circular outline of the air inlet 11 is shown in dashed lines. The arc-shaped notch 32 of the arc-shaped main body 31 is positioned in the region between adjacent guide columns 22 of the second set of guide columns 222, and the arc-shaped edge of the notch 32 is tangent or approximately tangent to the edge of the adjacent guide column 22. Therefore, because the arc-shaped notch 32 is located between adjacent guide columns 22, the airflow returning through the arc-shaped notch 32 avoids directly impacting the guide columns 22 in the second set of guide columns 222, reducing eddies and turbulence that may be generated by the airflow impacting the guide columns 22, and lowering the noise level. At the same time, this structure also allows the replenishing airflow to flow out from the arc-shaped gap 32 and first flow into the area between adjacent air guide columns 22 to diffuse evenly, filling the weak airflow areas that may exist between the air guide columns 22, improving the uniformity of the overall airflow distribution, making the airflow generated by the diffuser 100 more uniform and gentle, and improving the user's hair drying experience.

[0089] In other embodiments, reinforcing spokes 26 may be provided in the area corresponding to the air guide column 22 inside the air outlet structure 20 to further enhance the root strength of the air guide column 22, effectively improving the bending and fracture resistance of the air guide column 22. In some embodiments, refer to Figure 8The reinforcing spokes 26 can be preferentially disposed in the area corresponding to the air guide column 22 in the first group of air guide columns 221. As mentioned above, the first group of air guide columns 221 is located in the outer area of ​​the air outlet structure 20. When the diffuser 100 falls, the location of the first group of air guide columns 221 is often the first to contact the ground, thus having a higher risk of damage. In this embodiment, by adding reinforcing spokes 26 to the root of the air guide column 22 in the first group of air guide columns 221, its impact resistance can be significantly improved, the probability of damage in a fall accident can be reduced, and the service life of the diffuser 100 can be extended. In a further embodiment, the reinforcing spokes 26 can also be disposed in the area corresponding to the closed portion 23 formed around the air guide column 22, thereby forming a synergistic reinforcing structure with the closed portion 23. Meanwhile, since there is no through-hole 21 in the closed section 23 area, a continuous material base is provided, making the forming and connection of the reinforcing spokes 26 more convenient and robust. The combined structure of the closed section 23 and the reinforcing spokes 26 can more effectively disperse and transmit external impact force, further improving the overall drop resistance of the diffuser 100.

[0090] In some embodiments of this utility model, reference is made to Figures 1 to 8 The air outlet structure 20 has a plate body in the form of a flat circular or elliptical plate, and has a certain thickness, which is defined as the height from the surface of the air outlet structure 20 facing the inside of the diffuser 100 to its exposed surface. In some embodiments, the height (thickness) h of the plate body of the air outlet structure 20 is in the range of 3.0 mm to 4.0 mm. In this embodiment, by limiting the height (thickness) of the plate body of the air outlet structure 20 to a certain range, noise sound waves inside the diffuser 100 can be blocked, thereby reducing the noise level of the diffuser 100 during use and increasing user comfort.

[0091] In other embodiments of this utility model, in conjunction with reference to the reference Figure 3 as well as Figure 8 The first set of air guide columns 221 and the second set of air guide columns 222 are arranged concentrically, wherein the second set of air guide columns 222, located relatively inside, defines an inner ring region 27, for example, circular, and an outer ring region 28, for example, annular, defined between the first set of air guide columns 221 and the second set of air guide columns 222, located relatively outside. Figure 8 In the embodiment shown, the inner ring region 27 is, for example, a circular region with a diameter of d1, and the outer ring region 28 is, for example, an annular region with a width of d2.

[0092] In some embodiments, the height of at least a portion of the air outlets 21 in the inner ring region 27 may differ from the height of the air outlets 21 in the outer ring region 28, thereby creating a differentiated airflow effect. In an optional embodiment, the height of at least a portion of the air outlets 21 in the inner ring region is greater than the height of the air outlets 21 in the outer ring region. Thus, the higher air outlets 21 in the inner ring region 27 provide a longer airflow channel, increasing the contact area and time between the airflow and the channel wall, effectively consuming the noise energy carried by the airflow and suppressing noise. Simultaneously, the different heights of the air outlets 21 in the inner ring region 27 and the outer ring region 28 create a multi-layered airflow diffusion system, effectively preventing the air outlet end 12 of the diffuser 100 from forming a single-frequency acoustic resonance, further reducing the overall noise level of the diffuser 100 and optimizing the user experience.

[0093] In other embodiments, the air outlet 21 in the inner ring region may vary in height from the central axis region outwards, with the height of the air outlet 21 gradually decreasing from a maximum value (e.g., 4.0 mm) near the central axis of the air outlet structure 20 to a height close to that of the air outlet 21 in the outer ring region 28 (e.g., approximately 3.0 mm). This gradient design results in a relatively low airflow velocity from the inner ring region 27, and the decreasing height of the air outlet 21 with increasing distance from the central axis leads to a relatively uniform increase in airflow velocity, thereby optimizing the overall airflow distribution and making the diffusion effect more uniform, thus providing the user with a softer and more even breeze.

[0094] In other embodiments of this utility model, it should be noted that the diffuser 100 may also include a housing 10 and a flow guide 30, and may include other types of air outlet structures instead of the air outlet structure 20 described in the above embodiments. This may be advantageous in situations where it is necessary to control the overall volume of the diffuser or to use the air outlet structure 20 to achieve other functions.

[0095] In some embodiments of this utility model, a nursing device is also provided, which includes a diffuser 100, a handle, and a blower according to any of the above embodiments. In some embodiments, a first fluid channel may be formed in the handle, and a second fluid channel may be formed in the blower. The handle and the blower are connected, so that the first fluid channel formed in the handle communicates with the second fluid channel formed in the blower.

[0096] In some embodiments, the first fluid channel may be connected to the outside via the air inlet of the handle, thereby facilitating the entry of external fluids, such as airflow, into the first fluid channel and into the second fluid channel. The second fluid channel may be connected to the outside via the air outlet of the duct, thereby facilitating the flow of fluids in the second fluid channel, such as heated airflow, to the outside.

[0097] In some embodiments of the present invention, the air outlet of the duct is detachably connected to a diffuser 100 according to any of the above embodiments of the present invention, so that the airflow from the duct can enter the diffuser 100 through the air inlet 11 of the diffuser 100, flow through the fluid channel in the diffuser 100 and at least partially flow out from the plurality of air outlet holes 21 of the air outlet structure 20.

[0098] In a specific embodiment of this utility model, when the user starts the hair care device, the fan located in the handle begins to work, drawing in ambient air from the air inlet into the first fluid channel. The airflow then enters the second fluid channel of the air duct. A heating element (such as a PTC heater or a far-infrared heating element) is configured in this channel to heat the airflow. The heated, high-temperature airflow flows out from the air outlet of the air duct and enters the air inlet 11 of the diffuser 100. Then, guided by the guide member 30, the airflow is diverted and slowed down by the arc-shaped body 31. This process initially diffuses the originally concentrated and high-speed airflow. Subsequently, the airflow passes through the guide channel formed between the arc-shaped body 31 and the housing 10, further slowing down and distributing evenly. Finally, the airflow diffuses evenly outward through multiple air outlets 21 on the air outlet structure 20 and the air guide column 22, thus facilitating hair care for the user and achieving a naturally voluminous hairstyle.

[0099] It should be understood that the diffuser 100 of this utility model can be used with various hair care appliances that require the installation of diffusers, including but not limited to traditional hair dryers, flexible hair dryers, hair dryers, hot air styling tools, multi-functional hair care tools and other hair care devices. The diffuser 100 of this utility model can be used in conjunction with appropriate connection structures to reduce noise during uniform airflow diffusion and improve airflow uniformity, so as to meet the needs of users in different usage scenarios to care for their hair and obtain a natural and fluffy hairstyle.

[0100] 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.

[0101] 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.

[0102] 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 diffuser, characterized in that, include: The housing has an air inlet and an air outlet that are connected to each other, and a fluid channel is formed between the air inlet and the air outlet; An air outlet structure is provided at the air outlet end and has multiple air outlet holes communicating with the fluid channel; A flow guide is provided in the fluid channel, the flow guide having an arc-shaped body that protrudes toward the air inlet end; The projection of the arc-shaped main body onto the central axis of the air inlet covers the air inlet.

2. The diffuser according to claim 1, characterized in that, The arc-shaped body has multiple arc-shaped notches extending inward along its circumferential edge, and multiple spaced guide petals are formed between adjacent arc-shaped notches.

3. The diffuser according to claim 2, characterized in that, The multiple arc-shaped notches are evenly arranged along the circumference of the arc-shaped main body.

4. The diffuser according to any one of claims 1 to 3, characterized in that, The arc-shaped main body is spaced apart from the shell in the circumferential direction.

5. The diffuser according to any one of claims 1 to 3, characterized in that, The arc-shaped main body includes multiple support columns extending toward the air inlet end; The housing includes a plurality of receiving portions corresponding to the support columns, wherein the support columns are connected to the housing to mount the flow guide to the housing.

6. The diffuser according to any one of claims 1 to 3, characterized in that, The plurality of air outlets are arranged in an array, wherein the air outlet structure further includes at least one sealing part, the sealing part being used to close at least a portion of the air outlets.

7. The diffuser according to claim 6, characterized in that, The air outlet structure has a protruding air guide column, and the closure portion is at least partially arranged around the air guide column.

8. The diffuser according to claim 7, characterized in that, The air outlet structure includes one or more sets of annularly arranged air guide columns, at least one set of air guide columns being surrounded by the corresponding plurality of enclosed parts.

9. The diffuser according to claim 8, characterized in that, The air guide columns include a first set of air guide columns located on the outside and a second set of air guide columns located on the inside, wherein at least part of the corresponding enclosed portion is arranged around the first set of air guide columns.

10. The diffuser according to claim 9, characterized in that, In the projection of the closure and the guide along the central axis of the air outlet structure, the closure is located outside the guide.

11. The diffuser according to any one of claims 1 to 3, characterized in that, The housing includes an inner shell and an outer shell, with a cavity formed between the inner shell and the outer shell.

12. A diffuser, characterized in that, include: The housing has an air inlet and an air outlet that are connected to each other, and a fluid channel is formed between the air inlet and the air outlet; An air outlet structure is provided at the air outlet end and has multiple air outlet holes communicating with the fluid channel; The plurality of air outlets are arranged in an array, and the air outlet structure further includes at least one sealing part for at least sealing a portion of the air outlets.

13. The diffuser according to claim 12, characterized in that, The air outlet is a circular hole, and the air outlet structure has a protruding air guide column, wherein at least a portion of the closure portion is arranged around at least a portion of the air guide column.

14. The diffuser according to claim 13, characterized in that, The air outlet structure includes one or more sets of annularly arranged air guide columns, wherein at least a portion of the enclosed portion is arranged around at least one set of air guide columns.

15. The diffuser according to claim 14, characterized in that, The air guide columns include a first set of air guide columns located on the outside and a second set of air guide columns located on the inside, wherein at least part of the corresponding enclosed portion is arranged around the first set of air guide columns.

16. The diffuser according to any one of claims 12 to 15, characterized in that, The closed portion forms a boss.

17. The diffuser according to any one of claims 12 to 15, characterized in that, The diffuser also includes: A flow guide is provided in the fluid channel, the flow guide having an arc-shaped body that protrudes toward the air inlet end.

18. A nursing appliance, characterized in that, Includes the diffuser according to any one of claims 1 to 17.

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