Drying device

Abstract

Disclosed in the present application is a drying device (10), comprising a housing (11) having an air inlet (111), and further comprising an airflow assembly (14) for forming an airflow in the housing (11), the direction of the airflow downstream of the airflow assembly (14) being a first direction; and an air guide structure (12), the air guide structure (12) being mounted on the housing (11) and being located upstream of the airflow assembly (14), the air guide structure (12) comprising a plurality of sub-portions (121), each sub-portion (121) having a ventilation portion (1212) allowing airflow to flow therethrough and an air guide portion (1211) for guiding airflow to the ventilation portion (1212); the air inlet (111) is configured such that the airflow entering the housing (11) from the air inlet (111) is directed to the air guide portions.

Description

Drying equipment Technical Field

[0001] The present application relates to the technical field of drying equipment, and in particular to drying equipment. Background Art

[0002] A hair dryer is a device that delivers hot air. When a user uses a hair dryer, the airflow component inside the hair dryer operates, drawing in external air from the air inlet to form an airflow. Some existing hair dryers have auxiliary air ducts in addition to a main air duct for dissipating air. Airflow introduced into the auxiliary air ducts is expected to dissipate heat from related internal components.

[0003] However, since the main air duct generates a large negative pressure, most of the airflow near the air inlet will be sucked into it, making it difficult for the auxiliary air duct to inhale air to form sufficient airflow, and thus failing to achieve its design purpose.

[0004] Summary of the Invention

[0005] The present application provides a drying device, which aims to solve the problem of the difficulty in ensuring the air flow in the auxiliary air duct of the hair dryer in the technology.

[0006] The present application provides a drying device, including a shell having an air inlet, and an airflow component for forming an airflow in the shell, wherein the airflow direction downstream of the airflow component is a first direction; an air guide structure, wherein the air guide structure is installed on the shell and is located upstream of the airflow component, and the air guide structure includes multiple sub-parts, each of the sub-parts having a ventilation part for airflow to flow through and an air guide part for guiding the airflow to the ventilation part; the air inlet is configured such that the airflow entering the shell from the air inlet is guided to each of the air guide parts.

[0007] The drying equipment in the embodiment of the present application has an air guide structure that cooperates with the air inlet to distribute the inhaled air flow into the main air duct and the auxiliary air duct according to a preset ratio, so that the main air duct and the auxiliary air duct have sufficient air flow to achieve their respective design purposes.

[0008] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0010] FIG1 is a partial structural schematic diagram of a drying device in certain embodiments of the present application;

[0011] FIG2 is a schematic diagram of a housing and an air guide structure in certain embodiments of the present application;

[0012] FIG3 is a schematic diagram of an air guide structure in certain embodiments of the present application;

[0013] FIG4 is a schematic diagram of an air guide structure in some other embodiments of the present application;

[0014] Figures 5 and 6 are schematic diagrams of filter components of a drying device in certain embodiments of the present application;

[0015] FIG7 is a schematic diagram of a drying device with a filter assembly removed in certain embodiments of the present application;

[0016] FIG8 is a schematic diagram of a filter assembly in certain embodiments of the present application;

[0017] FIG9 is a schematic diagram of a filter assembly with a dust cover removed in certain embodiments of the present application;

[0018] FIG10 is a schematic diagram of a dust cover in certain embodiments of the present application;

[0019] FIG11 is a schematic diagram of the overall structure of a drying device in certain embodiments of the present application. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be understood as limiting the embodiments of the present application.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections. They can refer to mechanical connections or electrical connections. They can refer to direct connections or indirect connections through an intermediary. They can refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0024] The disclosure herein provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0025] As shown in Figure 1, an embodiment of the present application provides a drying device 10 comprising a housing 11, an airflow assembly 14, and an air guide structure 12. During operation, drying device 10 outputs airflow to dry a target object. Drying device 10 can be a hair dryer, in which case the target object is hair; drying device 10 can also be a hand dryer, a dryer, or the like.

[0026] A plurality of air ducts are formed inside the shell 11, and the air duct where the airflow component 14 is located is called the main air duct a, and the other air ducts are called auxiliary air ducts b. In the figure, the approximate flow direction of each part of the airflow is shown by dotted arrows, wherein the flow direction of the airflow downstream of the airflow component 14 in the main air duct a is the first direction. When the airflow component 14 is in operation, a negative pressure is generated in the main air duct a, and air is sucked in from the outside to form a high-speed airflow, which is output from the shell 11 and used to dry the target object. Affected by the main air duct a, an airflow is also formed in the auxiliary air duct b, and the airflow can dissipate heat to the relevant structures in the auxiliary air duct b (such as circuit boards, motor control boards, radiation components, power supply components and other heating structures), so that these structures can be prevented from affecting the smoothness of the airflow in the main air duct a while dissipating heat.

[0027] Referring to Figures 1, 2 and 3, the air guide structure 12 is installed in the shell 11 and is located upstream of the airflow component 14. The air guide structure 12 includes a plurality of sub-parts, each of which corresponds to each air duct. For ease of description, the sub-part corresponding to the main air duct a is referred to as the first sub-part 121, and the sub-part corresponding to the auxiliary air duct b is referred to as the second sub-part 122. It is easy to understand that the drying device 10 has at least one main air duct a and one auxiliary air duct b, so the air guide structure 12 includes at least a first sub-part 121 and a second sub-part 122. In other embodiments, the drying device 10 has a greater number of auxiliary air ducts b, then the number of sub-parts on the air guide structure 12 can be multiple, such as three, five, six, etc., wherein at least one sub-part corresponds to the main air duct a, and multiple sub-parts correspond to the auxiliary air ducts b.

[0028] The following describes various embodiments of the present application using a drying device 10 having a main air duct a and an auxiliary air duct b as an example. Accordingly, the air guide structure 12 has a first sub-section 121 and a second sub-section 122, and the two are adjacent. The following description relates to the connection between the first sub-section 121 and the second sub-section 122. In other embodiments, the air guide structure 12 has more sub-sections, and the description of the connection corresponds to the connection relationship between any two adjacent sub-sections, and should not be understood as specifically referring to the connection relationship between the first sub-section 121 corresponding to the main air duct a and the second sub-section 122 corresponding to the auxiliary air duct b.

[0029] In the first subsection 121, at least a portion of the area forms a first ventilation portion 1212, and at least a portion of the area forms a first air guide portion 1211. The first ventilation portion 1212 allows airflow to flow through, meaning that airflow located outside the air guide structure 12 (toward the exterior of the drying device 10) can enter the interior of the air guide structure 12 (toward the interior of the drying device 10) from the first ventilation portion 1212 and enter the main air duct a. The first air guide portion 1211 is used to guide airflow to the first ventilation portion 1212. In other words, a portion of the airflow flowing into the first subsection 121 directly enters the main air duct a from the first ventilation portion 1212, while another portion is guided and then enters the main air duct a from the first ventilation portion 1212.

[0030] Similarly, part of the airflow flowing to the second sub-portion 122 directly enters the auxiliary air duct b from the second ventilation part 1222, and the other part is guided to the second ventilation part 1222 by the second air guide part 1221, and then passes through the second ventilation part 1222 to enter the auxiliary air duct b.

[0031] The housing 11 is provided with an air inlet 111, which is located upstream of the air guide structure 12 and communicates with the air of the external environment. The air inlet 111 is configured to guide the airflow passing through the housing 11, and guide the airflow entering the housing 11 from the air inlet 111 to the various air guides.

[0032] When the drying apparatus 10 is in operation, because the airflow assembly 14 is located within the main air duct a, the flow path from the first ventilation portion 1212 to the airflow assembly 14 is shorter than the flow path from the second ventilation portion 1222 to the airflow assembly 14; and / or, the overall wind resistance from the first ventilation portion 1212 to the airflow assembly 14 is smaller than the overall wind resistance from the second ventilation portion 1222 to the airflow assembly 14. Accordingly, a greater negative pressure is formed at the first ventilation portion 1212, while a smaller negative pressure is formed at the second ventilation portion 1222.

[0033] Assuming the total amount of airflow drawn into the drying apparatus 10 through the air inlet 111 remains constant, the greater the amount of air entering the main air duct a, the less air entering the auxiliary air duct b. Conversely, the greater the amount of air entering the auxiliary air duct b, the less air entering the main air duct a. For simplicity, the ratio of the airflow in the main air duct a to the airflow in the auxiliary air duct b will be referred to as the main-to-auxiliary air duct flow ratio.

[0034] The larger the flow rate ratio of the main air duct and the auxiliary air duct, the less airflow there is in the auxiliary air duct b. Too little airflow in the auxiliary air duct b will make it difficult to achieve effective heat dissipation of the related structures. The smaller the flow rate ratio of the main air duct and the auxiliary air duct, the less airflow there is in the main air duct a. Too little airflow in the main air duct a will lead to insufficient drying efficiency. In addition, since the negative pressure of the main air duct a is greater than the negative pressure of the auxiliary air duct b, it is easy to cause the flow rate ratio of the main air duct to be too large. For this reason, the air guide structure 12 in the embodiment of the present application cooperates with the related structures to ensure that the flow rate ratio of the main air duct is in a suitable range, so that both the main air duct a and the auxiliary air duct b have sufficient airflow to achieve their respective design purposes.

[0035] Specifically, the air in the external environment is directed twice before entering the main air duct a and the auxiliary air duct b:

[0036] First guidance: The air inlet 111 guides the airflow to the first air guide portion 1211 and the second air guide portion 1221. It can also be understood that the purpose of the first guidance is to prevent the first ventilation portion 1212, the second ventilation portion 1222 from forming a straight airflow path with the external environment.

[0037] Second guidance: the first air guiding portion 1211 guides the airflow to the first ventilation portion 1212 and enters the main air duct a, and the second air guiding portion 1221 guides the airflow to the second ventilation portion 1222 and enters the auxiliary air duct b.

[0038] By adjusting the area, position, and actual orientation of the first and second air guides 1211, 1221, and the direction of the air inlet 111, the proportion of airflow received by the first and second air guides 1211, 1221 from the air inlet 111 can be changed, thereby changing the ratio of the primary and secondary airflows. More specifically, the larger the area of ​​the first and second air guides 1211, 1221, and the closer they are to the downstream side of the air inlet 111, the greater the proportion of airflow received. Conversely, the smaller the area, the smaller the proportion of airflow received.

[0039] In the above-mentioned two guides, if the first guide is missing, for example, the air guide structure 12 is directly connected to the external environment, the first ventilation part 1212 and the second ventilation part 1222 can form a straight airflow path between the external environment. According to aerodynamics, the air will flow along the shortest path to the area with the largest negative pressure. Therefore, almost all the airflow will flow along the straight path to the first ventilation part 1212, and only a weak airflow will flow to the second ventilation part 1222.

[0040] If the secondary guidance is absent, for example, if the air inlet 111 directly directs the airflow to the first ventilation portion 1212 and the second ventilation portion 1222, a straight airflow path will still be formed between the first ventilation portion 1212 and the external environment, causing almost all of the airflow to enter the main air duct a, with only a small amount of airflow flowing into the auxiliary air duct b. In both of these situations, the first air guide portion 1211 and the second air guide portion 1221 will be unable to perform their functions of guiding and distributing the airflow, ultimately resulting in an excessively large flow ratio between the main and auxiliary air ducts.

[0041] From the above content, it can be seen that the drying equipment 10 in the embodiment of the present application guides the airflow through the air inlet 111 and the air guide structure 12, and can control the flow ratio of the main and auxiliary air ducts so that the main air duct a and the auxiliary air duct b have sufficient air flow.

[0042] In some embodiments as shown in FIG3 , the first air guide portion 1211 and the second air guide portion 1221 on the air guide structure 12 are arranged adjacent to each other. It can also be understood that on the air guide structure 12, the first ventilation portion 1212 and the second ventilation portion 1222 are separated by the first air guide portion 1211 and the second air guide portion 1221. The air inlet 111 can roughly direct the airflow to the area where the first air guide portion 1211 and the second air guide portion 1221 are located. The first air guide portion 1211 and the second air guide portion 1221 respectively direct the airflow on their surfaces to the first ventilation portion 1212 and the second ventilation portion 1222. In this way, the air guide accuracy requirements at the air inlet 111 can be reduced, and it is sufficient to roughly determine that the overall direction of the airflow is directed to the area where the two air guides are located. Furthermore, by adjusting the ratio of the areas occupied by the first air guide portion 1211 and the second air guide portion 1221 in the area where they are located, the flow ratio of the main and auxiliary air ducts can be adjusted. In other embodiments not shown, the first air guide portion 1211 and the second air guide portion 1221 are not arranged adjacent to each other, and the air inlet 111 guides the airflow to the first air guide portion 1211 and the second air guide portion 1221 respectively.

[0043] In some embodiments as shown in FIG3 , a step structure 123 is formed between the first air guide portion 1211 and the second air guide portion 1221. The first air guide portion 1211 constitutes the top of the step structure 123, and the second air guide portion 1221 constitutes the bottom of the step structure 123. The step structure 123 has a step sidewall 1231 connecting the first air guide portion 1211 and the second air guide portion 1221.

[0044] Step sidewalls 1231 create significant wind resistance for air flowing toward them. Air flowing from the bottom of the step to the top is affected by the wind resistance of step sidewalls 1231. Conversely, air flowing from the top to the bottom of the step can directly cross step sidewalls 1231, experiencing virtually no wind resistance. Therefore, step structure 123 can function as a one-way wind guide.

[0045] Specifically, the airflow from the first air guide 1211 at the top of the step can flow along the first air guide 1211 toward the first ventilation portion 1212, or cross the step structure 123 toward the second air guide 1221. However, the airflow from the second air guide 1221 at the bottom of the step is hindered by the wind resistance of the step sidewall 1231 when flowing toward the first air guide 1211, making it difficult for the airflow to flow toward the top of the step and thus can only flow toward the second ventilation portion 1222.

[0046] As previously mentioned, the first ventilation section 1212 corresponding to the main air duct a has a relatively large negative pressure, while the second ventilation section 1222 corresponding to the auxiliary air duct b has a relatively small negative pressure. When the negative pressure difference between the two is large, the airflow in the second air guide section 1221 is affected by the negative pressure of the first ventilation section 1212 and flows toward the first ventilation section 1212, ultimately resulting in insufficient air intake in the auxiliary air duct b. The aforementioned stepped structure 123 creates a one-way wind resistance, blocking the airflow from the second air guide section 1221 from flowing toward the first ventilation section 1212, thereby ensuring sufficient airflow in the auxiliary air duct b.

[0047] In addition, by adjusting the angle of the step side wall 123, the closer the angle between it and the plane at the bottom of the step structure 123 (that is, the second air guide portion 1221) is to a right angle, the greater the wind resistance formed by the step side wall 123; by adjusting the size of the step side wall 1231 (that is, the distance between the top and bottom of the step structure 123 in the axial direction of the air guide structure 12), the larger the area of ​​the step side wall 1231, the more airflow can be affected. Both of the above situations will increase the airflow entering the second ventilation portion 1222, that is, reduce the main-to-auxiliary air duct flow ratio. Therefore, without changing other structures and parameters in the drying equipment 10, the main-to-auxiliary air duct flow ratio can be adjusted by adjusting the angle and size of the step side wall 1231. It should be noted that, in the above and below texts, there are multiple ways to adjust the main-to-auxiliary air duct flow ratio. It should be understood that these methods can adjust the main-to-auxiliary air duct flow ratio individually or together, and the following will not be repeated.

[0048] In other embodiments not shown, a bidirectional wind resistance structure may be designed at the junction of the first air guide portion 1211 and the second air guide portion 1221. For example, a convex ring structure may have an outer wall facing the second air guide portion 1221 and creating a greater wind resistance, while an inner wall facing the first air guide portion 1211 and creating a greater wind resistance. The convex ring structure serves as a boundary, preventing airflow from flowing between the first air guide portion 1211 and the second air guide portion 1221.

[0049] In some embodiments shown in FIG4 , the first air guide portion 1211 and the second air guide portion 1221 of the air guide structure 12 are located on the same surface. Alternatively, there is no clear boundary between the first air guide portion 1211 and the second air guide portion 1221 , allowing airflow to flow freely along this surface, resulting in lower wind resistance and wind noise. This is suitable for drying equipment 10 with a smaller negative pressure difference between the first ventilation portion 1212 and the second ventilation portion 1222 .

[0050] The "same surface" mentioned above is not limited to a plane. For example, as shown in FIG4 , the air guide structure 12 has an arcuate surface, and the first air guide portion 1211 and the second air guide portion 1221 are both formed on the arcuate surface. In other embodiments not shown, the air guide structure 12 has a plane, and the first air guide portion 1211 and the second air guide portion 1221 are formed on the plane. In other embodiments not shown, the first air guide portion 1211 and the second air guide portion 1221 are not on the same plane, but the portion connecting the two is a smooth curved surface, and there is no significant change in wind resistance when the air flows between the first air guide portion 1211 and the second air guide portion 1221.

[0051] In some embodiments as shown in Figures 2 and 3, on any plane perpendicular to the first direction, the first sub-portion 121 is circular or annular, and the second sub-portion 122 is annular and surrounds the outside of the first sub-portion 121, with a step structure 123 formed at the intersection of the two. The central area of ​​the air guide structure 12 forms the first sub-portion 121, corresponding to the main air duct a. In some more specific embodiments, the airflow component 14 coincides with the axis of the air guide structure 12, and the first sub-portion 121 is arranged around the axis of the air guide structure 12 near the central area to ensure uniform air intake in the radial direction of the main air duct a.

[0052] The outer edge of the air guide structure 12 forms a second subsection 122, corresponding to the auxiliary air duct b surrounding the outer edge of the main air duct a. Other related structures are provided between the main air duct a and the auxiliary air duct b to isolate them from each other to prevent airflow mixing and affect the smoothness of airflow in the main air duct a.

[0053] In some more specific embodiments, the inner wall of the shell 11 forms a side wall of the auxiliary air duct b. When the airflow in the auxiliary air duct b flows along the inner wall of the shell 11, it can dissipate heat from the shell 11, and the user will not feel overheating when touching the shell 11 of the drying device 10.

[0054] As shown in Figures 2 and 3, in some more specific embodiments, on any plane perpendicular to the first direction, the projections of the first ventilation portion 1212, the first air guide portion 1211, the second air guide portion 1221, and the second ventilation portion 1222 form a circle or ring that is nested in descending order. In conjunction with Figure 1, the projection of the air inlet 111 forms a ring or circle that at least partially overlaps with the shape formed by the projections of the first air guide portion 1211 and the second air guide portion 1221.

[0055] When the airflow component 14 is in operation, a negative pressure is formed inside the shell 11. After the airflow enters from the annular or circular air inlet 111, it will be guided to flow to the first air guide portion 1211 and the second air guide portion 1221, and will be evenly distributed along the annular or circular shape in the radial direction, flowing to the first ventilation portion 1212 and the second ventilation portion 1222, so that the main air duct a and the auxiliary air duct b can evenly intake air in the radial direction, each forming a relatively smooth airflow.

[0056] In some embodiments as shown in FIG3 , a portion of the first sub-portion 121 is shaped like a truncated pyramid, a frustum, a pyramid, or a cone, and has an inclined sidewall 1213 that is inclined relative to a first direction. The inclined sidewall 1213 is provided with one or more first through-holes for airflow, and the one or more first through-holes constitute a first ventilation portion 1212. The inclined first ventilation portion 1212 helps reduce wind noise during air guidance and can also guide the passing airflow to a certain extent.

[0057] Furthermore, the greater the slope of the inclined sidewall 1213, the larger its surface area, and the larger the area of ​​the first ventilation portion 1212 that can be accommodated, which is equivalent to increasing the air intake of the main air duct a. Therefore, by adjusting the slope of the inclined sidewall 1213, the flow rate ratio of the main and auxiliary air ducts can also be adjusted.

[0058] In some embodiments, as shown in Figure 3, the second air guide portion 1221 expands outward along the first direction to form an inclined air guide surface. The inner edge of the air guide surface forms the bottom of the step structure 123, and the outer edge connects to the second ventilation portion 1222. Airflow flowing into the second air guide portion 1221 can be guided along the inclined air guide surface to the second ventilation portion 1222. The purpose of the inclined air guide surface is still to reduce wind noise during airflow guidance.

[0059] In some embodiments as shown in FIG3 , the wind guide surface formed by the second wind guide portion 1221 and the air inlet surface of the second ventilation portion 1222 are located in the same plane. In this way, the airflow can flow along the wind guide surface and smoothly enter the second ventilation portion 1222, and no wind noise will be generated between the two. It should be noted that the above-mentioned "same plane" is not limited to a "plane" in the mathematical sense, but can also be a curved surface, an arc-shaped surface, etc. with curvature in space, as long as there is no obvious sudden change in curvature and / or a smooth transition at the connection between the two. The wind guide surface formed by the second wind guide portion 1221 in the figure is roughly a part of the side surface of the cone, and accordingly, the air inlet surface of the second ventilation portion 1222 is also a part of the side surface of the cone.

[0060] In some embodiments as shown in Figure 2, no seal is formed between the outer edge of the air-guiding structure 12 and the shell 11, and a gap is reserved between the two for airflow to pass through, and the gap constitutes the second ventilation portion 1222. In some specific embodiments, a complete gap is formed along the circumference of the air-guiding structure 12 and surrounds the air-guiding structure 12, constituting an annular second ventilation portion 1222. In other specific embodiments, the air-guiding structure 12 has a plurality of gaps spaced circumferentially, and gaps are formed at each gap, and the plurality of gaps constitute the second ventilation portion 1222 spaced along the annular interval. The portion without the gap can be in contact with and positioned with the shell 11 to ensure the axial positioning between the air-guiding structure 12 and the shell 11. In the above embodiments, by adjusting the size of the gap, such as increasing the gap or reducing the gap, the actual air inlet area of ​​the second ventilation portion 1222 can be changed, thereby achieving the purpose of adjusting the flow ratio of the main and auxiliary air ducts.

[0061] In the above embodiment, the second air guide portion 1221 is actually formed by the air guide structure 12 and the shell 11, that is, the air guide structure 12 forms a part of the second air guide portion 1221. In other embodiments not shown, one or more second through holes for air flow to pass through are provided in the second sub-portion 122 of the air guide structure 12, and the plurality of second through holes constitute the second ventilation portion 1222. In this way, the air flow passing through the second ventilation portion 1222 does not flow through the shell 11, and it can also be understood that the entire second air guide portion 1221 is formed by the air guide structure 12. By adjusting the size of the second through hole, such as increasing or decreasing the inner diameter of the second through hole, the actual air inlet area of ​​the second ventilation portion 1222 can be changed, and the purpose of adjusting the flow ratio of the main and auxiliary air ducts can also be achieved.

[0062] In some embodiments shown in Figures 1 and 3, the middle portion of the air guide structure 12 bulges away from the airflow assembly 14 and forms a concave cavity 124 on the side facing the airflow assembly 14. The upstream of the airflow assembly 14 is connected to the concave cavity 124. At least a portion of the first ventilation portion 1212 is disposed on the sidewall of the concave cavity 124, and the second ventilation portion 1222 is not directly connected to the concave cavity 124.

[0063] Airflow from the first subsection 121 can enter the concave cavity 124 through the first ventilation portion 1212. The airflow assembly 14 directly draws air from the concave cavity 124, forming a high-speed airflow in the main air duct a. Without changing the outer diameter of the air guide structure 12 (which would affect its assembly with the housing 11), a greater degree of protrusion in the middle of the air guide structure 12 increases the surface area of ​​the sidewalls of the concave cavity 124, allowing it to accommodate a larger first ventilation portion 1212. This increases the airflow into the main air duct a and achieves the purpose of adjusting the flow rate ratio between the main and auxiliary air ducts.

[0064] The airflow of the second sub-portion 122 does not enter the concave cavity 124 , but enters the auxiliary air duct b from the second ventilation portion 1222 , thereby separating the airflow of the main air duct a and the auxiliary air duct b on the air guide structure 12 .

[0065] In some embodiments as shown in FIG. 5 to FIG. 8 , the drying device 10 further includes a filter assembly 13 for filtering the airflow entering the drying device 10 to prevent debris from entering the housing 11 along with the airflow.

[0066] The filter assembly 13 includes a base 131, a filter structure 132, and a dust cover 133. The base 131 is detachably mounted on the air guide structure 12 and / or the housing 11 to achieve installation and positioning between the filter assembly 13 and the housing 11.

[0067] The filter structure 132 is mounted on the base 131, covering the downstream of the air inlet 111 and located in the path of the air flow. All air entering from the air inlet 111 flows through the filter structure 132 and is filtered. In some specific embodiments, the filter structure 132 includes multiple layers of filter screens with different pore sizes, and each layer of filter screen is capable of filtering foreign matter of different sizes. In other specific embodiments, the filter structure 132 also includes a filter element with a three-dimensional structure. In other specific embodiments, the filter structure 132 includes an air inlet grille to block larger foreign matter, such as paper, cloth, etc.

[0068] The dust cover 133 is removably mounted on the air guide structure 12 and / or the base 131, and the dust cover 133 forms at least a portion of the air inlet 111. The air inlet 111 can be understood as the portion of the drying device 10 that can directly exchange airflow with the external environment, and can also be understood as the upstreammost portion of all structures of the entire drying device 10. In some specific embodiments, the dust cover 133 itself forms the complete air inlet 111, that is, the airflow only flows through the dust cover 133 when entering the drying device 10. In other embodiments, the dust cover 133 and other structures, such as the housing 11, the base 131, etc., together form the air inlet 111, that is, the airflow flows through the dust cover 133 and other structures when entering the drying device 10.

[0069] The "removable installation" of the base 131 and dust cover 133 mentioned above means that the user can install or remove them in a predetermined manner as needed. When the base 131 and dust cover 133 are both installed, the drying device 10 can be used normally. Unless otherwise specified below, the base 131 and dust cover 133 are both installed. When one or both of the base 131 and dust cover 133 are removed, the filter assembly 13 can be cleaned to varying degrees, including the following states:

[0070] (a) With the base 131 in the installed state, remove the dust cover 133. At this point, the user can clean the outer surface of the filter structure 132 (the surface facing the outside of the drying apparatus 10) to remove foreign matter accumulated on the outer surface of the filter structure 132, keeping the outer surface clean.

[0071] (b) With the dust cover 133 installed, remove the base 131. This allows the user to clean the inner surface of the filter structure 132 (the surface facing the interior of the drying apparatus 10). Furthermore, since the entire filter assembly 13 is removed from the housing 11, it can be thoroughly cleaned directly by washing it with water, vacuuming it, or using other methods.

[0072] (c) The dust cover 133 and the base 131 are removed. At this point, the user can thoroughly clean all parts of the filter assembly 13.

[0073] In some specific embodiments, the user applies force to the dust cover 133, causing the entire filter assembly 13 to be removed from the housing 11, and then directly enter the above-mentioned state (b) for cleaning. If the cleaning needs are not met, the dust cover 133 is further removed from the base 131, and the above-mentioned state (c) is entered for cleaning.

[0074] In other specific embodiments, the user applies force to the dust cover 133, which removes the dust cover 133 from the base 131, and then enters the above-mentioned state (a) for cleaning. If the cleaning needs are not met, the base 131 is further removed from the housing 11, and then enters the above-mentioned state (c) for cleaning.

[0075] In some specific embodiments, the base 131 and the air guide structure 12 are mounted on each other through magnetic adsorption. When removing the filter assembly 13, the user applies a force opposite to the magnetic force to the filter assembly 13 and pulls the filter assembly 13 away from the housing 11. In other embodiments, a removable installation between the filter assembly 13 and the air guide structure 12 or the housing 11 can be achieved by means of snap-fitting, bolts, etc. In other embodiments, a rubber ring, spring plunger, or other structure can be provided between the filter assembly 13 and the housing 11 so that the two have greater friction when moving relative to each other, thereby also achieving removable installation of the filter assembly 13.

[0076] In some more specific embodiments as shown in Figures 7 and 8, the air guide structure 12 is provided with at least one mounting portion 125 formed of iron, and the base 131 is correspondingly provided with at least one magnetic portion 1312 having magnetic force. In addition, at least one mounting portion 125 is provided with a Hall sensor (not shown) for detecting whether the magnetic portion 1312 is in place. The Hall sensor is an electrical component that can detect magnetic force. When the filter assembly 13 is in the installed state, the magnetic portion 1312 and the mounting portion 125 are attracted to each other, and the mounting portion 125 can conduct magnetism so that the Hall sensor detects the magnetic force and outputs an in-place signal. In other embodiments, photoelectric sensors, distance sensors, cameras combined with image recognition, Bluetooth or RFID wireless communications, etc. can also be used to identify whether the filter assembly 13 is in place.

[0077] If the user forgets to replace the filter assembly 13 after removing it for cleaning, the Hall effect sensor will not detect the magnetic force and will not send a presence signal. In some embodiments, the drying device 10 is further equipped with an indicator light, a buzzer, a display screen, or other structures that can be used in conjunction with the presence signal to send a prompt message to the user whether the drying device 10 is currently installed with the filter assembly 13. In some embodiments, the control strategy of the drying device 10 is configured such that it cannot start operation if it does not receive the presence signal, thereby preventing the user from using the drying device 10 without the filter assembly 13 installed.

[0078] In some specific embodiments, there are multiple mounting portions 125 that are evenly distributed along the circumference of the air guide structure 12; and there are correspondingly multiple magnetic portions 1312 that are evenly distributed along the circumference of the base 131. This can provide multi-position magnetic adsorption and increase the installation strength of the filter structure 13.

[0079] In some embodiments as shown in Figures 7 and 8, one or more guide components for guidance are provided between the base 131 and the shell 11 and / or the air guide structure 12, and the guide components include a guide groove 1311 and a guide block 112 that can be inserted into the guide groove 1311 and slide.

[0080] When the user installs the filter assembly 13 into the housing 11, the guide block 112 and the guide groove 1311 cooperate to guide and position the filter assembly 13, so that the magnetic portion 1312 and the mounting portion 125 are aligned with each other during the installation process. In this way, after the filter assembly 13 is installed, the corresponding magnetic portion 1312 and the mounting portion 125 can accurately contact each other and maintain the filter assembly 13 in the installed state through magnetic force.

[0081] The locations of the guide block 112 and the guide groove 1311 are not limited. In some embodiments shown in Figures 7 and 8, the guide groove 1311 is disposed on the base 131, and the guide block 112 is disposed on the air guide structure 12. In other embodiments not shown, the guide block 112 is disposed on the base 131, and the guide groove 1311 is disposed on the housing 11 and / or the air guide structure 12.

[0082] In some specific embodiments, the guide block 112 and the guide groove 1311 extend along a first direction. When the filter assembly 13 is installed into the housing 11, the guide block 112 and the guide groove 1311 cooperate to limit the filter assembly 13 from sliding along the first direction, thereby ensuring that the filter assembly 13 can be installed into the housing 11 in the correct direction without being skewed.

[0083] In some specific embodiments, as shown in Figures 7 and 8, one end of the guide groove 1311 has an outwardly flared, inclined sidewall to facilitate positioning of the guide block 112 when it enters the guide groove 1311. The outwardly flared, inclined sidewall provides a larger insertion opening for the guide groove 1311, reducing the positioning accuracy required for the guide block 112 when inserted into the guide groove 1311, making it easier for the user to install the filter assembly 13.

[0084] In some more specific embodiments, one end of the guide block 112 has an inwardly tapered end portion (not shown) to facilitate positioning of the guide block 112 when entering the guide groove 1311. The inwardly tapered end portion allows the guide block 112 to have a smaller insertion end, thereby reducing the positioning accuracy requirement for the guide block 112 when inserted into the guide groove 1311, making it easier for the user to install the filter assembly 13.

[0085] In some more specific embodiments, one end of the guide groove 1311 has an outward-slanting side wall, and one end of the guide block 112 has an inward-slanting end, which can further reduce the positioning accuracy requirements for inserting the guide block 112 into the guide groove 1311.

[0086] In some embodiments, as shown in Figure 8, the base 131 has multiple magnetic portions 1312, and a portion of each magnetic portion 1312 forms a guide slot 1311. To accommodate the magnets, the magnetic portion 1312 of the base 131 is larger than the other portions, resulting in greater strength. The provision of guide slots 1311 compensates for the impact of slotting on the strength of the base 131, ensuring that the overall strength of the base 131 meets design requirements.

[0087] In some embodiments, as shown in FIG8 , the base 131 has an inner cavity 1313. The filter structure 132 is mounted at one end of the inner cavity 1313, and the other end of the inner cavity 1313 forms an opening. Referring to FIG1 through FIG3 and some of the aforementioned embodiments, the first subsection 121 of the air guide structure 12 passes through the opening and is located within the inner cavity 1313. Airflow passing through the filter structure 132 and entering the inner cavity 1313 can flow toward the first subsection 121 and enter the main air duct a.

[0088] In combination with some of the aforementioned embodiments, the middle portion of the air guide structure 12 protrudes in a direction away from the airflow component 14, and forms a concave cavity 124 on the side facing the airflow component 14, and at least part of the first ventilation portion 1212 is arranged on the side wall of the concave cavity 124. And the greater the degree of protrusion, the greater the air intake of the main air duct a. Therefore, by adjusting the shape and size of the protrusion of the air guide structure 12, it is possible to adjust the flow ratio of the main and auxiliary air ducts. The inner cavity 1313 of the above-mentioned base 131 can accommodate the protruding portion of the air guide structure 12, and the sizes and shapes of the two are adapted to each other to avoid structural interference.

[0089] In some more specific embodiments, as shown in Figure 8 , the sidewalls of the inner cavity 1313 are provided with a plurality of lateral through-holes 1314 for airflow. In conjunction with Figures 1 to 3 and some of the aforementioned embodiments, the second subsection 122 of the air guide structure 12 is located outside the inner cavity 1313. Airflow exiting the lateral through-holes 1314 flows toward the second subsection 122 and enters the auxiliary air duct b. In other embodiments not shown, the sidewalls of the inner cavity 1313, except for the magnetic portion 1312, may be completely removed to increase airflow into the auxiliary air duct b.

[0090] In some embodiments as shown in Figures 9 and 10, one or more first clamping blocks 1331 are provided at the center of the dust cover 133, and one or more second clamping blocks 1315 are provided at the center of the base 131. The first clamping blocks 1331 and the second clamping blocks 1315 can be clamped together to achieve installation between the dust cover 133 and the base 131.

[0091] Specifically, the first card block 1331 and the second card block 1315 are configured as follows:

[0092] When the dust cover 133 at the preset position rotates along the first direction, the first clamping block 1331 and the second clamping block 1315 are clamped together, so that the dust cover 133 and the base 131 are installed together;

[0093] When the dust cover 133 at the preset position rotates along the second direction, the first locking block 1331 and the second locking block 1315 separate from each other, so that the dust cover 133 and the base 131 are released from each other.

[0094] Since the force-applying process for installing and removing the dust cover 133 is rotation, while the force-applying process for installing and removing the base 131 is pulling. Therefore, the installation and removal processes of the dust cover 133 and the base 131 will not affect each other. Specifically, when the user applies an outward pulling force to the dust cover 133, the pulling force will not drive the dust cover 133 to rotate, so the dust cover 133 can remain in the installed state and serve as a force-bearing point for removing the base 131, thereby removing the base 131 from the shell 11 and pulling it out of the shell 11. Similarly, in the process of installing the base 131 into the shell 11, the user applies an inward pushing force to the dust cover 133, and the dust cover 133 can also remain in the installed state and serve as a force-bearing point.

[0095] In conjunction with Figures 7 and 8 and some of the aforementioned embodiments, a guide groove 1311 and a guide block 112 are provided between the base 131 and the housing 11 and / or the air guide structure 12, preventing the base 131 from rotating relative to the housing 11. Therefore, when a user applies a rotational force in the second direction to the dust cover 133, the base 131 does not rotate accordingly. Instead, the dust cover 133 and the base 131 rotate relative to each other until the first engaging block 1331 and the second engaging block 1315 separate, and the dust cover 133 is detached from the base 131. Similarly, when a user applies a rotational force in the first direction to the dust cover 133, the first engaging block 1331 and the second engaging block 1315 engage each other, securing the dust cover 133 and the base 131.

[0096] In conjunction with some of the aforementioned embodiments, the user can either directly pull the dust cover 133 outward to remove the entire filter assembly 13 from the housing 11, or rotate the dust cover 133 to remove it separately. Alternatively, after the user pulls the dust cover 133 outward to remove the filter assembly 13 from the housing 11, they can then firmly grasp the base 131 and dust cover 133 and apply a rotational force to further remove the dust cover 133 from the filter assembly 13.

[0097] In some embodiments as shown in FIG5 , the dust cover 133 is circular or annular, and an annular air inlet 111 is formed between the edge of the dust cover 133 and the housing 11. The annular air inlet 111 can uniformly intake air in the radial direction.

[0098] In conjunction with the embodiments shown in Figures 1 to 3, the first air guide portion 1211 and the second air guide portion 1221 both extend in an annular shape. The annular air inlet 111 formed between the dust cover 133 and the housing 11 enables airflow to enter the housing 11 and flow along a generally annular path to the first air guide portion 1211 and the second air guide portion 1221. In other embodiments, the dust cover 133 may also have other shapes, and the annular air inlet 111 may be provided on the dust cover 133. In other embodiments, the air inlet 111 may also include a plurality of ventilation holes or hollow areas formed on the housing 11 and distributed along an annular path.

[0099] As shown in FIG. 11 , in some embodiments, the housing 11 includes a main body 113 and a handle 114 , wherein the handle 114 is a portion for a user to hold, and the main body 113 is the portion of the drying device 10 that directly outputs airflow.

[0100] In some specific embodiments shown in FIG11 , the air inlet 111 of the drying apparatus 10 is formed on the main body 113. Therefore, the filter assembly 13 is also mounted on the main body 113, and air flows through the air inlet 111 into the main body 113. Referring also to FIG1 , the aforementioned air guide structure 12 is mounted on the main body 113, and the main air duct a and the auxiliary air duct b are both formed within the main body 113.

[0101] In other embodiments not shown, the air inlet 111 of the drying device 10 is formed on a handle 114, and the filter assembly 13 is correspondingly mounted on the handle 114. Air flows through the air inlet 111 into the handle 114, and then flows from the interior of the handle 114 along a predetermined path into the main body 113. The air guide structure 12 is mounted within the handle 114, and at least a portion of the main air duct a or the auxiliary air duct b is formed in the handle 114.

[0102] In other embodiments not shown, the main body 113 and the handle 114 both have an air inlet 111, and a filter assembly 13 and an air guide structure 12 are installed on the handle 114 and the main body 113, respectively, so that air flows into the main body 113 and the handle 114 from the corresponding air inlet 111. In certain more specific embodiments, the handle 114 and the main body 113 are installed with exactly the same air inlet 111, and are correspondingly installed with the same filter assembly 13 and air guide structure 12. In other more specific embodiments, the air inlets 111 of the handle 114 and the main body 113 have different shapes and / or sizes, and are correspondingly provided with different filter assemblies 13 and / or air guide structures 12, which can be a combination of any of the above embodiments.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example" or "some examples" means that the specific features, structures, orientations, positions, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, orientations, positions, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0104] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A drying device, comprising a housing having an air inlet, characterized in that, Further included are: An air flow component for forming an air flow within the housing, and the air flow direction downstream of the air flow component is the first direction; A wind guiding structure, which is installed on the housing and is located upstream of the air flow component. The wind guiding structure includes a plurality of sub-parts, and each sub-part has a ventilation part through which air flow can pass and a wind guiding part for guiding the air flow to the ventilation part; The air inlet is configured such that the air flow entering the housing from the air inlet is guided to each of the wind guiding parts.

2. The drying device according to claim 1, characterized in that, Among two adjacent sub-parts, the two wind guiding parts are arranged adjacent to each other.

3. The drying device according to claim 2, characterized in that, The two adjacent wind guiding parts form a stepped structure, one wind guiding part constitutes the top of the stepped structure, and the other wind guiding part constitutes the bottom of the stepped structure; The stepped structure has a stepped side wall connecting the two wind guiding structures, and the stepped side wall is used to block the air flow from flowing from its bottom to its top.

4. The drying device according to claim 3, characterized in that, The sub-part includes: A first sub-part having a first ventilation part and a first wind guiding part, and the first wind guiding part is located at the top of the stepped structure; A second sub-part having a second ventilation part and a second wind guiding part, and the second wind guiding part is located at the bottom of the stepped structure; The length of the flow path from the first ventilation part to the air flow component is less than the length of the flow path from the second ventilation part to the air flow component; and / or, the overall air resistance from the first ventilation part to the air flow component is less than the overall air resistance from the second ventilation part to the air flow component.

5. The drying device according to claim 4, characterized in that, On any plane perpendicular to the first direction, the first sub-part is circular or annular, the second sub-part is annular and surrounds the outside of the first sub-part, and the stepped structure is formed at the junction of the two.

6. The drying device according to claim 4, characterized in that, On any plane perpendicular to the first direction, the projections of the first ventilation part, the first wind guiding part, the second wind guiding part, and the second ventilation part form circles or rings nested in sequence from large to small; The projection of the air inlet forms a ring or a circle, and at least partially overlaps with the shapes formed by the projections of the first wind guiding part and the second wind guiding part.

7. The drying device according to claim 4, characterized in that, The shape of a partial area of the first sub-part is any one of a frustum, a frustum of a cone, a pyramid, and a cone, and it has inclined side walls inclined relative to the first direction. One or more first through holes for air flow to pass through are provided on the inclined side walls, and the plurality of first through holes constitute the first ventilation part.

8. The drying device according to claim 4, characterized in that, Along the first direction, the second wind guiding part expands outward and forms an inclined wind guiding surface; The inner edge of the wind guiding surface forms the bottom of the stepped structure, and the outer edge is connected to the second ventilation part.

9. The drying device according to claim 8, characterized in that, The wind guiding surface and the air inlet surface of the second ventilation part are in the same plane.

10. The drying device according to claim 4, characterized in that, One or more second through holes for air flow to pass through are provided on the second sub-part, and the plurality of second through holes constitute the second ventilation part; or, The gap between the outer edge of the wind guiding structure and the housing constitutes the second ventilation part.

11. The drying device according to claim 2, characterized in that, Two adjacent wind guiding parts are formed on the same surface; or, the transition between two adjacent wind guiding parts is smooth.

12. The drying device according to claim 11, characterized in that, The shape of a partial area of the air guiding structure is any one of a frustum of a pyramid, a frustum of a cone, a pyramid, and a cone, and has inclined side walls inclined relative to the first direction, and the two air guiding parts are formed on the inclined side walls.

13. The drying device according to claim 4, characterized in that, The middle part of the air guiding structure bulges away from the air flow assembly, and a concave cavity is formed on the side facing the air flow assembly, and the upstream of the air flow assembly communicates with the concave cavity; at least a part of the first ventilation part is arranged on the side wall of the concave cavity, and the second ventilation part is not directly communicated with the concave cavity.

14. The drying device according to any one of claims 1 to 13, characterized in that, It further includes a filtering assembly, and the filtering assembly includes: A base, detachably installed on the air guiding structure and / or the housing; A filtering structure, installed on the base and covering the air inlet; A dust-proof cover, detachably installed on the air guiding structure and / or the base, and the dust-proof cover forms at least a part of the air inlet.

15. The drying device according to claim 14, wherein The dust-proof cover is circular or annular, and an annular air inlet is formed between the edge of the dust-proof cover and the housing.

16. The drying device according to claim 14, wherein The filtering structure includes multiple layers of filter meshes with different pore sizes.

17. The drying device according to claim 14, wherein One or more first magnetic parts are provided on the air guiding structure, one or more second magnetic parts are provided on the base, and the base and the air guiding structure are mutually installed by magnetic adsorption.

18. The drying device according to claim 17, wherein At least one of the first magnetic parts is formed of iron, and a Hall sensor for detecting whether the second magnetic part is in place is provided on the installation part.

19. The drying device according to claim 18, wherein The number of the first magnetic parts is multiple and evenly distributed along the circumferential direction of the air guiding structure; the number of the second magnetic parts corresponds to multiple and is evenly distributed along the circumferential direction of the base.

20. The drying device according to claim 17, wherein One or more groups of guiding assemblies for guiding are provided between the base and the housing and / or the air guiding structure, and the guiding assemblies include guiding grooves and guiding blocks that can be placed in the guiding grooves and slide.

21. The drying device according to claim 20, wherein One end of the guiding groove has a laterally expanding inclined side wall for positioning when the guiding block enters the guiding groove; and / or, One end of the guiding block has a retracted inclined end for positioning when the guiding block enters the guiding groove.

22. The drying device according to claim 20 or 21, wherein The guiding block and the guiding groove extend along the first direction.

23. The drying device according to claim 20 or 21, wherein The base has one or more installation parts, and the second magnetic part and the guiding groove are provided on each installation part.

24. The drying device according to claim 20 or 21, wherein The installation part has a cavity extending radially along the first direction, and the second magnetic part is installed in the cavity.

25. The drying device according to claim 14, wherein One or more first clamping blocks are provided at the center of the dust-proof cover, and one or more second clamping blocks are provided at the center of the base. The first clamping block and the second clamping block are configured as follows: When the dust-proof cover in the preset position rotates along the first direction, the first clamping block and the second clamping block are clamped with each other, so that the dust-proof cover and the base are mutually installed; When the dust-proof cover in the preset position rotates along the second direction, the first clamping block and the second clamping block are separated from each other, so that the dust-proof cover and the base are disassembled.

26. The drying device according to claim 14, wherein The base has an inner cavity; The filtering structure is installed at one end of the inner cavity, an opening is formed at the other end of the inner cavity, and at least one sub-part passes through the opening and is located in the inner cavity.

27. The drying device according to claim 26, wherein A plurality of lateral through holes through which air can pass are provided on the side wall of the inner cavity; At least one of the sub-parts is located outside the inner cavity, and the air flow flowing out from the lateral through-hole flows towards the sub-part.

28. For the drying device according to claim 14, the housing includes a main body and a handle; The air guiding structure and the filtering assembly are installed on the main body, and air flows through the air inlet into the main body; or, The air guiding structure and the filtering assembly are installed on the handle, and air flows through the air inlet into the handle; or, The main body and the handle are respectively provided with the air inlet structure and the filter assembly, and air flows into the main body and the handle respectively from the corresponding air inlets.

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