Blower

Abstract

A blower. The blower (10) comprises a first portion (210), a second portion (220) and a third portion (230) which are connected in sequence. The first portion (210) forms an air outlet, the second portion (220) can be bent, the second portion (220) takes a straight line as a central axis, and the second portion (220) comprises an inner surface (224), the inner surface (224) forming a channel allowing an airflow to circulate, and there being a plane P passing through the central axis; on the plane P, the point on the inner surface (224) which is the farthest from the central axis is defined as a first point F, and the point which is closest to the central axis is defined as a second point E; and a difference value between a distance from the first point F to the central axis and a distance from the second point E to the central axis is a distance difference d, the distance difference d being smaller than or equal to 8 mm.

Description

hair dryer

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on December 27, 2023, with application numbers 202323601359.8 and 202311837949.2. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to an electric tool, for example, a hair dryer. Background Art

[0003] A hair dryer in the related art can quickly clean fallen leaves, sand and gravel, etc. The hair dryer is a commonly used cleaning tool in parks, communities, streets and other places. Sanitation workers use the hair dryer to clean foreign objects on the ground with high efficiency and good cleaning effect.

[0004] Hair dryers often feature a bellows on their outlet duct, which deforms under external forces, allowing users to easily adjust the airflow angle. However, the bellows also have multiple raised structures on the inside, which act as windbreaks within the air duct, increasing airflow resistance. This increases the power consumption and overall cost of the hair dryer. Summary of the Invention

[0005] This application adopts the following technical solutions:

[0006] A hair dryer comprises: a first part connected in sequence, forming an air outlet; a second part, which is capable of being bent and has a straight line as its central axis; a third part, comprising a fan, which rotates around the fan axis to form an airflow; the second part comprising an inner surface, which forms a channel for airflow; there is a plane P passing through the central axis, on which the point on the inner surface farthest from the central axis is a first point F, and the point on the inner surface closest to the central axis is a second point E, the difference in distances between the first point F and the second point E and the central axis is a distance difference d, and the distance difference d is less than or equal to 8 mm.

[0007] In some embodiments, the second portion includes a first communicating portion and a spiral portion, wherein the spiral portion is coiled outside the first communicating portion.

[0008] In some embodiments, the distance difference d is less than or equal to 5 mm.

[0009] In some embodiments, for any plane P passing through the central axis, the distance difference d is less than or equal to 2 mm.

[0010] In some embodiments, the first connecting portion and the spiral portion are an integrally formed structure, or the first connecting portion and the spiral portion are bonded together.

[0011] In some embodiments, the spiral portion is a layered structure, comprising at least one of a metal layer and a plastic layer; and / or the first connecting portion is a layered structure, comprising a TPU layer.

[0012] In some embodiments, the hair dryer further includes a connector, which connects the second part with the first part or the third part, and the connector is sleeved on the outside of the end of the first connecting part.

[0013] In some embodiments, the end of the spiral portion is embedded in the connector, which includes a first connector and a second connector. The first connector and the second connector are respectively arranged at both ends of the first connecting portion, the first connector is plugged into the first part, and the second connector is plugged into the third part.

[0014] In some embodiments, the hair dryer also includes a first joint, which installs and locks the second part and the third part; the first joint includes a first outer joint, a second outer joint and a first inner joint, the first inner joint is at least partially screwed into the second part, and the first inner joint is at least partially extended into the third part, and the first outer joint can be rotated relative to the second outer joint to lock the second part, the third part and the first inner joint.

[0015] In some embodiments, the spacing a between two adjacent turns of the spiral portion in a naturally extended state is greater than or equal to 5 mm and less than or equal to 50 mm.

[0016] In some embodiments, the overall length b of the first connecting portion in a naturally extended state is greater than or equal to 100 mm and less than or equal to 500 mm.

[0017] In some embodiments, the thickness of the first connecting portion in a naturally extended state is less than or equal to 3 mm.

[0018] In some embodiments, the second portion further includes a second connecting portion, and the second connecting portion is wrapped around the outside of the spiral portion.

[0019] In some embodiments, for any plane P passing through the central axis, a section line formed by the plane P passing through the second portion on the inner surface is substantially a straight line.

[0020] In some embodiments, the third part is used to take in and generate wind. The third part also includes a motor and an air rectifier. The motor can drive the fan to rotate, and the air rectifier is used to guide the airflow.

[0021] In some embodiments, at least a portion of the second portion is made by a thermoplastic process.

[0022] A power tool comprises a first part, a flexible second part, and a third part connected in sequence, wherein the first part, the second part, and the third part all extend with a first straight line as the central axis; the second part comprises a first connecting part, a spiral part, and a second connecting part, wherein the spiral part is coiled on the outside of the first connecting part, and the second connecting part is wrapped around the outside of the spiral part; the inner side of the first connecting part has an inner surface, and the inner surface forms a channel for air flow or liquid circulation; there is a plane P passing through the central axis, and on the plane P, the point on the inner surface farthest from the central axis is a first point F, and the point on the inner surface closest to the central axis is a second point E, and the difference in distance between the first point F and the second point E and the central axis is a distance difference d, and the distance difference d is less than or equal to 8 mm.

[0023] In some embodiments, the electric tool further includes a connector, which connects the second part with the first part or the third part, and the connector is sleeved on the end of the second part.

[0024] In some embodiments, the end of the spiral portion is embedded in the connector, which includes a first connector and a second connector. The first connector and the second connector are respectively arranged at both ends of the first connecting portion, the first connector is plugged into the first part, and the second connector is plugged into the third part.

[0025] In some embodiments, the power tool also includes a first joint, which installs and locks the second part and the third part; the first joint includes a first outer joint, a second outer joint and a first inner joint, the first inner joint is at least partially screwed into the second part and at least partially extends into the third part, the first outer joint can be rotated relative to the second outer joint, and when the first outer joint and the second outer joint are rotated to close, the first joint locks the second part and the third part.

[0026] A device for allowing liquid or gas to circulate, comprising a first part, a flexible second part, and a third part connected in sequence, wherein the first part, the second part, and the third part all extend with a first straight line as the central axis; the second part comprises a first connecting part, a spiral part, and a second connecting part, wherein the spiral part is coiled on the outside of the first connecting part, and the second connecting part is wrapped around the outside of the spiral part; the inner side of the first connecting part has an inner surface, and the inner surface forms a channel for air flow or liquid circulation; there is a plane P passing through the central axis, on which the point on the inner surface farthest from the central axis is a first point F, and the point on the inner surface closest to the central axis is a second point E, and the difference in distance between the first point F and the second point E and the central axis is a distance difference d, and the distance difference d is less than or equal to 8 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an assembly diagram of the hair dryer and the shoulder strap structure;

[0028] Figure 2 is an exploded view of the hair dryer and strap structure;

[0029] Figure 3 is an exploded view of the hair dryer;

[0030] FIG4 is an assembly diagram of the second part of the hair dryer;

[0031] FIG5 is a front view of the structure shown in FIG4;

[0032] FIG6 is a cross-sectional view of the structure shown in FIG4;

[0033] FIG7 is an exploded view of the second portion of the hair dryer;

[0034] FIG8 is a front view of the structure shown in FIG7;

[0035] FIG9 is a cross-sectional view of the structure shown in FIG7;

[0036] FIG10 is a schematic diagram of the plane P and the second straight line of the second portion;

[0037] FIG11 is a cross-sectional view of the second portion taken along plane P;

[0038] FIG12 is a first schematic diagram of part A in FIG11 ;

[0039] FIG13 is a second schematic diagram of part A in FIG11 ;

[0040] FIG14 is a third schematic diagram of part A in FIG11 ;

[0041] FIG15 is a fourth schematic diagram of part A in FIG11 ;

[0042] FIG16 is a fifth schematic diagram of part A in FIG11 ;

[0043] FIG17 is another embodiment of the blowing and sucking structure;

[0044] FIG18 is a cross-sectional view of FIG17 taken along plane P;

[0045] FIG19 is an exploded view of the blowing and suction structure in FIG17 ;

[0046] FIG20 is a schematic diagram of the assembly of the first outer joint portion and the second outer joint portion;

[0047] FIG21 is a schematic diagram of the first outer joint portion and the second outer joint portion being disassembled;

[0048] FIG22 is an enlarged view of portion B in FIG18 ;

[0049] FIG23 is a schematic diagram of a first inner joint;

[0050] FIG24 is a schematic diagram of the third part;

[0051] FIG25 is a schematic diagram of the first outer joint portion and the second outer joint portion in FIG21 being closed;

[0052] FIG26 is an assembly diagram of the third portion of the hair dryer and the housing from one viewing angle;

[0053] FIG27 is an assembly diagram of the third portion of the hair dryer and the housing from another perspective;

[0054] FIG28 is a schematic diagram of a first structure of a hair dryer;

[0055] FIG29 is an exploded view of the structure shown in FIG28;

[0056] FIG30 is an exploded view of the second structure of the third part of the hair dryer, the housing, and the air inlet grille at one viewing angle;

[0057] FIG31 is an exploded view of the second structure of the third part of the hair dryer, the housing, and the air inlet grille from another perspective;

[0058] FIG32 is an exploded view of a second structure of the third portion of the hair dryer;

[0059] FIG33 is a cross-sectional view of a second configuration of the third portion of the hair dryer;

[0060] FIG34 is an assembly diagram of a third structure of the third part of the hair dryer at a certain viewing angle;

[0061] FIG35 is an assembly diagram of the third structure of the third part of the hair dryer from another perspective;

[0062] FIG36 is a first exploded view of a third structure of the third portion of the hair dryer;

[0063] FIG37 is a second exploded view of the third structure of the third portion of the hair dryer;

[0064] FIG38 is a cross-sectional view of a third structure of the third portion of the hair dryer. DETAILED DESCRIPTION

[0065] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0066] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0067] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0068] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0069] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0070] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0071] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0072] The present application provides a hair dryer 10, which is used to generate airflow to push objects such as fallen leaves and stones. The hair dryer 10 is often used in fields such as cleaning roads and gardens. As shown in Figures 1 to 3, the blowing and suction structure 200 includes a first part 210, a second part 220, and a third part 230 connected in sequence. The third part 230 is used to take in and generate air, the second part 220 is used to connect the first part 210 and the third part 230, and the first part 210 is mainly used to guide the generated wind and to discharge the air. In other words, a channel for airflow is formed from the third part 230 to the first part 210, and the airflow direction flows from the third part 230 through the second part 220 and then out of the first part 210. The hair dryer 10 also includes a housing 100, which can be connected to the blowing and suction structure 200. The housing 100 can also form a storage space to accommodate at least part of the blowing and suction structure 200.

[0073] In this embodiment, the second portion 220 includes a central axis 102, which is hereinafter referred to as the second straight line. The first portion 210 has the first straight line 101 as its central axis, the second portion 220 has the second straight line (i.e., the central axis 102) as its central axis, and the third portion 230 has the third straight line 103 as its central axis.

[0074] Continuing with reference to Figure 3, the first part 210 includes an air duct 270, which is a cylindrical structure with openings at both ends. One end of the air duct 270 forms a connecting portion, which connects the air duct 270 to one end of the second part 220. The other end of the air duct 270 forms an air outlet 211. The wind formed in the third part 230 flows out from the air outlet 211 after being guided by the second part 220 and the first part 210.

[0075] In one embodiment, the air duct 270 is generally cylindrical, and the distal end of the air duct 270 is formed with a tapered structure whose cross-sectional area gradually decreases along the air outlet direction, so that the air outlet 211 is a bell-shaped structure. In some embodiments, the air duct 270 is a spliced ​​structure formed by coaxially connecting multiple cylindrical structures. The overlapping length between two adjacent cylindrical structures can be adjusted and locked after being adjusted to the appropriate length, thereby making the overall length of the air duct 270 adjustable, thereby increasing the flexibility of the hair dryer 10.

[0076] Continuing with Figures 3 to 16 , to facilitate user adjustment of the air outlet 211, the second portion 220 is bendable. Alternatively, the second portion 220 can be deformed to straighten or bend. The second portion 220 is flexible, meaning it can bend in various directions perpendicular to the central axis 102 . The second portion 220 includes an inner surface 224 that forms a channel for airflow. As shown in Figures 10 to 16 , there is a plane P passing through the second straight line. On plane P, the point on the inner surface 224 farthest from the second straight line is a first point F, and the point on the inner surface 224 closest to the second straight line is a second point E. The difference in distance between the first point F and the second point E from the second straight line is a distance difference d, which is greater than or equal to 0 and less than or equal to 8 mm. This arrangement results in fewer wrinkles on the second portion 220, including the inner surface 224, thereby reducing resistance within the air duct. This, in turn, reduces energy consumption during operation of the hair dryer 10, lowering operating costs and increasing airflow.

[0077] For any plane P passing through the second straight line, in some embodiments, the distance difference d is less than or equal to 5 mm; in some embodiments, the distance difference d is less than or equal to 3 mm; in some embodiments, the distance difference d is less than or equal to 2 mm; and in some embodiments, the distance difference d is less than or equal to 1 mm. For any plane P passing through the second straight line, the smaller the distance difference d, the smoother the inner surface 224 of the second portion 220, and the less resistance the inner surface 224 of the second portion 220 creates to airflow.

[0078] In one embodiment, for any plane P passing through the second straight line, the section formed by the plane P passing through the second portion 220 on the inner surface 224 is substantially a straight line. In this case, the inner surface 224 is relatively smooth, and the resistance that the air needs to overcome when flowing through the inner surface 224 is relatively small.

[0079] Compared to the related art in which the second part is directly set as a spiral structure so that the spiral structure part is protruding in the air duct and the wind resistance increases, the hair dryer 10 provided by the present application is provided by setting the second part 220 as a first connecting part 221 and a spiral part 222 that are nested inside and outside. The first connecting part 221 is set inside the spiral part 222, and the inner surface of the first connecting part 221 is surrounded to form an air duct for air to pass through. Since the difference in the distance between the first point F and the second point E on the inner surface of the first connecting part 221 and the second straight line is the distance difference d, the distance difference d is less than or equal to 8 mm, thereby reducing the resistance in the air duct, thereby reducing the energy consumption of the hair dryer 10 during operation and reducing the cost of use. In a specific embodiment, as shown in Figure 12, the inner surface 241 is basically smooth. The second part 220 includes a first connecting part 221 and a spiral part 222. The spiral part 222 is coiled on the outside of the first connecting part 221. The inner surface of the first connecting part 221 forms the inner surface 224 of the second part 220, and the inner surface 224 is basically smooth. The spiral portion 222 drives the first communication portion 221 to deform together with the spiral portion 222 by bending and deforming itself.

[0080] In a specific embodiment, as shown in FIG. 13 , micro protrusions are formed on the inner surface 224 .

[0081] In a specific embodiment, as shown in Figure 14, the second part 220 includes a first connecting portion 221, a spiral portion 222 and a second connecting portion 225. The spiral portion 222 is coiled on the outside of the first connecting portion 221, and the second connecting portion 225 is wrapped on the outside of the spiral portion 222, so that the outer surface 226 of the second part 220 is basically smooth.

[0082] In a specific embodiment, as shown in Figure 15, the second part 220 includes a first connecting part 221, a spiral part 222 and a second connecting part 225. The spiral part 222 is coiled on the outside of the first connecting part 221, and the second connecting part 225 is wrapped around the outside of the spiral part 222. A tiny protrusion is formed on the inner surface 224, and the outer surface 226 of the second part 220 is basically smooth.

[0083] In a specific embodiment, as shown in FIG16 , the cross-section of the second portion 220 cut along a plane P is substantially corrugated.

[0084] In some embodiments, the first connecting portion 221 and the spiral portion 222 are integrally formed, that is, the first connecting portion 221 and the spiral portion 222 can be integrally formed in a molten state during the manufacture of the second portion 220. Of course, in other embodiments, the first connecting portion 221 and the spiral portion 222 can also be formed separately. After the separate forming, the first connecting portion 221 and the spiral portion 222 are assembled together by bonding or other methods.

[0085] The first connecting portion 221 and the spiral portion 222 can be made of metal or non-metal. In one embodiment, the first connecting portion 221 is made of thermoplastic polyurethane (TPU). In other embodiments, other soft materials can also be used to make the first connecting portion 221, as long as they do not affect the bendability of the second portion 220.

[0086] The spiral portion 222 can be made of a single material or a composite structure made of multiple materials. In some embodiments, the spiral portion 222 is a layered structure, comprising at least one of a metal layer and a plastic layer. In one specific embodiment, the spiral portion 222 is a single-layer structure comprising a metal layer or a plastic layer. In another embodiment, the spiral portion 222 is a double-layer structure, comprising a metal layer and a plastic layer stacked one above the other or one stacked inside and outside. In yet another embodiment, the spiral portion 222 is a multi-layer structure comprising at least three layers, with metal layers and plastic layers alternately stacked one above the other or one stacked inside and outside. In one embodiment, a thermoplastic process is used during processing, for example, by heating the material to a molten state, extruding it, and winding it around a cylinder, while simultaneously forming the first connecting portion 221 and the spiral portion 222 into a cylindrical structure, which is then cooled after molding. In other embodiments, the first connecting portion 221 and the spiral portion 222 can be molded separately and then coiled together using other processes.

[0087] The first connecting portion 221 may be a structure made of a single material or a composite structure made of multiple materials. In one embodiment, the first connecting portion 221 is a layered structure, and the first connecting portion 221 includes at least a TPU layer.

[0088] In order to achieve quick connection between the second part 220 and the first part 210 or the third part 230, in some embodiments, the hair dryer also includes a connecting head 223, which is used to dock with the first part 210 or the third part 230, and the connecting head 223 is sleeved on the outside of the end of the first connecting part 221.

[0089] As shown in Figures 4 to 9, the connector 223 is a cylindrical structure, and the connector 223 is plugged into and matched with the connection structure of the first part 210 above, or the connector 223 is plugged into and matched with the third part 230. There are two connectors 223, namely a first connector 2231 and a second connector 2232. The two connectors 223 are respectively sleeved on both ends of the first connecting portion 221, the first connector 2231 is connected to the first part 210, and the second connector 223 is connected to the third part 230. In this embodiment, the first connector 2231 is plugged into the first part 210, and the second connector 2232 is plugged into the third part 230. It should be noted that the connector 223 and the first connecting portion 221 here do not belong to the second part 220.

[0090] In this embodiment, the length of the second portion 220 along the central axis 102 is greater than 50 mm. In some embodiments, the length of the second portion 220 along the central axis 102 is greater than 100 mm. In some embodiments, the length of the second portion 220 along the central axis 102 is greater than 150 mm. In some embodiments, the length of the second portion 220 along the central axis 102 is greater than 200 mm.

[0091] In some embodiments, the length of the second portion 220 along the central axis 102 is greater than 250 mm. In some embodiments, the length of the second portion 220 along the central axis 102 is greater than 300 mm and less than 500 mm. In some embodiments, the length of the second portion 220 along the central axis 102 can be 120 mm, 140 mm, 160 mm, 180 mm, 200 mm, 220 mm, 240 mm, 260 mm, 280 mm, 300 mm, 320 mm, etc.

[0092] In some embodiments, the end of the spiral portion 222 is embedded in the connecting head 223. Specifically, a spiral groove 2233 is formed on the inner wall surface of the connecting head 223, and the end of the spiral portion 222 can be stuck in the spiral groove 2233. This arrangement improves the connection strength between the spiral portion 222 and the connecting head 223 and reduces the chance of accidental detachment of the connecting head 223.

[0093] In some embodiments, the spacing a between two adjacent turns of the spiral portion 222 in its naturally extended state is greater than or equal to 5 mm and less than or equal to 50 mm. In some embodiments, the spacing a between two adjacent turns of the spiral portion 222 in its naturally extended state is greater than or equal to 10 mm and less than or equal to 20 mm. In a specific embodiment, the spacing a between two adjacent turns of the spiral portion 222 in its naturally extended state is 10 mm; in a specific embodiment, the spacing a between two adjacent turns of the spiral portion 222 in its naturally extended state is 14 mm; in a specific embodiment, the spacing a between two adjacent turns of the spiral portion 222 in its naturally extended state is 17 mm; in a specific embodiment, the spacing a between two adjacent turns of the spiral portion 222 in its naturally extended state is 20 mm.

[0094] In some embodiments, the overall length b of the first connecting portion 221 in its naturally extended state is 100 mm to 500 mm. In a specific embodiment, the overall length b of the first connecting portion 221 in its naturally extended state is 100 mm; in a specific embodiment, the overall length b of the first connecting portion 221 in its naturally extended state is 200 mm; in a specific embodiment, the overall length b of the first connecting portion 221 in its naturally extended state is 300 mm; in a specific embodiment, the overall length b of the first connecting portion 221 in its naturally extended state is 400 mm; in a specific embodiment, the overall length b of the first connecting portion 221 in its naturally extended state is 500 mm.

[0095] In some embodiments, the thickness H of the first connecting portion 221 in the naturally extended state is less than or equal to 3 mm. In some embodiments, the thickness H of the first connecting portion 221 in the naturally extended state is less than or equal to 2 mm.

[0096] It should be noted that the spacing a and overall length b herein are measured when the spiral portion 222 is in a naturally extended state. In the naturally extended state, for example, when the spiral portion 222 is placed horizontally on a mirror-like surface, the overall length b or spacing a of the spiral portion 222 is not changed by gravity or human-applied external forces.

[0097] In some embodiments, a coating is provided on the inner surface of the first connecting portion 221. The coating may be an antifouling coating or a lubricating coating. The coating can further reduce the roughness of the inner surface of the first connecting portion 221, thereby further reducing wind resistance. In one embodiment, the coating is a nanomaterial layer.

[0098] Figures 17 to 25 illustrate another embodiment of a blower and suction structure 200 for a hair dryer 10. The components in Figures 17 to 21 that have the same reference numerals as those in the embodiment disclosed in Figures 1 to 9 have the same structure and features, and therefore are not described repeatedly. The following describes in detail only the differences between the embodiment disclosed in Figures 17 to 21 and the embodiment disclosed in Figures 1 to 9.

[0099] The blowing and suction structure 200 includes a first part 210, a second part 220, and a third part 230, wherein the second part 220 can be bent, and the third part 230 includes a fan 2322. The rotation of the fan 2322 forms an airflow, which flows out from the air outlet 211. In this embodiment, the second part 220 and the third part 230 are installed together through the first joint 251, and the second part 220 and the first part 210 are installed together through the second joint 252. In other words, the connector 223 in the embodiment shown in Figures 1 to 9 becomes the first joint 251 and the second joint 252 in this embodiment. The connector 223 and the first joint 251 have the same function, both of which are used to fix the second part 220 to the first part 210 and the third part 230 respectively. The connector 223 and the first joint 251 are both provided with a threaded structure to screw with the spiral part 222.

[0100] As shown in Figure 19, the first joint portion 251 includes a first outer joint portion 2511, a second outer joint portion 2512, and a first inner joint portion 2513. The first inner joint portion 2513 extends into one end of the bendable second portion 220. The outer contour of the first inner joint portion 2513 is formed with a first protrusion 25131. The first protrusion 25131 can be threaded or non-threaded. When the first protrusion 25131 is threaded, the first protrusion 25131 is screw-fitted with the spiral portion 222. The first outer joint portion 2511, the second outer joint portion 2512, and the first inner joint portion 2513 are all made of a rigid material, such as plastic.

[0101] The specific structure of the second portion 220 in this embodiment is the same as that shown in FIG12 , namely, the spiral portion 222 is coiled around the outside of the first connecting portion 221. In conjunction with the cross-sectional view of FIG18 and the partially enlarged view of FIG22 , because the second portion 220 is deformable, or in other words, has a certain degree of flexibility, when the first protrusion 25131 extends into the interior of the opening of the second portion 220, even if the spiral portion 222 is coiled around the outside of the first connecting portion 221, the first protrusion 25131 can still form a spiral engagement with the first connecting portion 221. In this embodiment, the first protrusion 25131 and the spiral portion 222 are spirally engaged, and the flexible first connecting portion 221 is squeezed and deformed, allowing the first inner joint 2513 to achieve a preliminary spiral engagement with the second portion 220.

[0102] 20 and 21 , the first outer joint 2511 and the second outer joint 2512 form a pivotable connection. When the first outer joint 2511 and the second outer joint 2512 are closed, the first inner joint 2513, the second portion 220, and the third portion 230 are locked. The second outer joint 2512 is provided with a connecting pin 25121. The first outer joint 2511 is provided with a mounting opening 25111. The connecting pin 25121 is inserted into the mounting opening 25111, allowing the first outer joint 2511 to rotate about the central axis of the connecting pin 25121, thereby achieving opening or closing of the first outer joint 2511 and the second outer joint 2512. A positioning pin 25122 is provided on the side of the second outer joint 2512 opposite the connecting pin 25121. A positioning hole 25112 is provided on the first outer joint 2511. The positioning pin 25122 extends into the positioning hole 25112, allowing the first outer joint 2511 and the second outer joint 2512 to be precisely positioned before being locked. A first screw hole 25113 is provided on the first outer joint 2511, and a second screw hole 25123 is provided on the second outer joint 2512. When the first outer joint 2511 and the second outer joint 2512 are closed, the first screw hole 25113 and the second screw hole 25123 are aligned, and the user can lock the first outer joint 2511 and the second outer joint 2512 by installing screws.

[0103] As shown in Figures 21 to 23, the inner surfaces of the first outer joint 2511 and the second outer joint 2512 have similar structures. The following description will only use the first outer joint 2511 as an example. The first outer joint 2511 has a first groove 25114. The outer contour of the first inner joint 2513 is formed with a second protrusion 25133. The first groove 25114 can limit the movement of the second protrusion 25133 in the front-to-back direction. The outer contour of the first inner joint 2513 is formed with a third protrusion 25134. The third protrusion 25134 extends into the first outer joint 2511 and / or the second outer joint 2512, ensuring accurate positioning of the first inner joint 2513 with the first outer joint 2511 and / or the second outer joint 2512. The inner surface of the first outer joint 2511 forms a raised fourth protrusion 25115 , and a second groove 25116 is formed between the two fourth protrusions 25115 . The second groove 25116 accommodates the spiral portion 222 , so that the first outer joint 2511 limits the axial movement of the second part 220 .

[0104] As shown in Figures 24 and 25, the third portion 230 has a first edge 2301 (see Figure 24) near the first joint 251. A fifth protrusion 2302 is provided near the first edge 2301. The inner surface of the first outer joint 2511 is provided with a third groove 25117. The fifth protrusion 2302 forms a form fit with the third groove 25117 to prevent the third portion 230 from moving along the axis or rotating about the axial direction. With reference to Figures 22 and 23, the first inner joint 2513 includes a step 25132 that surrounds and wraps around the first edge 2301.

[0105] The technical solution described above enables the first joint portion 251 to lock the second portion 220 and the third portion 230 together, preventing the second portion 220 and the third portion 230 from axially moving and preventing the third portion 230 from rotating about the third straight line 103. The second joint portion 252 locks the first portion 210 and the second portion 220. The second joint portion 252 includes a third outer joint portion 2521, a fourth outer joint portion 2522, and a second inner joint portion 2523. The working principles of these joint portions are similar to those of the first joint portion 251 and will not be further described here. It should be noted that the second joint portion 252 can also be locked using a different principle from that of the first joint portion 251, which is not limited here.

[0106] The technical solutions disclosed in Figures 1 to 25 are applicable not only to a hair dryer 10, but also to other air flow devices such as blowers and vacuums. It should be noted that the second portion 220 can not only provide air flow but also other fluids such as liquids.

[0107] In one embodiment, the above technical solution can be applied to a power tool. The power tool includes a first portion 210, a flexible second portion 220, and a third portion 230, which are connected in sequence. The first portion 210, the second portion 220, and the third portion 230 all extend along the central axis 102. The second portion 220 includes a first connecting portion 221, a spiral portion 222, and a second connecting portion 225. The spiral portion 222 is coiled around the outside of the first connecting portion 221, and the second connecting portion 225 is wrapped around the outside of the spiral portion 222. The first connecting portion 221 has an inner surface 241 on its inner side, forming a channel for air or liquid to flow. There is a plane P passing through the central axis 102. On plane P, the point on the inner surface 241 farthest from the central axis is a first point F, and the point on the inner surface 241 closest to the central axis is a second point E. The difference in distance between the first point F and the second point E from the central axis is a distance difference d, which is less than or equal to 8 mm.

[0108] In one embodiment, the above technical solution can be applied to a device for liquid or gas circulation. The device comprises a first portion 210, a flexible second portion 220, and a third portion 230, which are connected in sequence. The first portion 210, the second portion 220, and the third portion 230 all extend along the central axis 102. The second portion 220 comprises a first connecting portion 221, a spiral portion 222, and a second connecting portion 225. The spiral portion 222 is coiled around the outside of the first connecting portion 221, and the second connecting portion 225 is wrapped around the outside of the spiral portion 222. The first connecting portion 221 has an inner surface 241 on its inner side, forming a channel for gas or liquid circulation. A plane P passes through the central axis 102. On plane P, the point on the inner surface 241 farthest from the central axis is a first point F, and the point on the inner surface 241 closest to the central axis is a second point E. The difference in distance between the first point F and the second point E and the central axis is a distance difference d, which is less than or equal to 8 mm.

[0109] As shown in Figures 26 to 31, the third part 230 includes a blowing and suction housing 231, a functional component 232, and a radiator 233. The blowing and suction housing 231 includes a wind-generating housing 2312 and an air intake housing 2311, which are interconnected. The air intake housing 2311 is the housing portion for air intake and is formed with an air inlet 23115. The wind-generating housing 2312 is a housing surrounding the functional component 232. The functional component 232 is at least used to generate air. Therefore, the functional component 232 includes at least a fan 2322. In one embodiment, the functional component 232 also includes a motor 2321, which drives the fan 2322 to rotate.

[0110] In this embodiment, the functional component 232 includes a motor 2321, a fan 2322, and an air rectifier 2323. The motor 2321 is at least partially disposed within the air-generating housing 2312 and is used to provide power. The fan 2322 is at least partially disposed within the air-generating housing 2312. The motor 2321 is capable of driving the fan 2322 to rotate about the fan axis 104 to form an airflow within the suction and blowing housing 231. The air rectifier 2323 is at least partially disposed within the air-generating housing 2312 and is used to guide the airflow. The control board 234 is electrically connected to the motor 2321 and is used to control the operation of the motor 2321. The radiator 233 is connected to the control board 234 and is mounted to the suction and blowing housing 231. The radiator 233 is used to accelerate heat dissipation from the control board 234.

[0111] In this embodiment, the first straight line 101 is the central axis of the air cylinder 270, and the second straight line is the central axis of the first connecting portion 221 and the spiral portion 222. In one embodiment, the third straight line 103 may coincide with the fan axis 104. In some embodiments, the functional components 232 are entirely disposed within the air-generating housing 2312. In one specific embodiment, the motor 2321 is entirely disposed within the air-generating housing 2312, and the fan 2322 is partially disposed within the air-generating housing 2312. In another specific embodiment, the motor 2321 is partially disposed within the air-generating housing 2312, and the fan 2322 is entirely disposed within the air-generating housing 2312. It should be noted that the front and rear positions of the motor 2321 and fan 2322 can be reversed. That is, in the direction of the third straight line 103, the motor 2321 can be located in front of or behind the fan 2322.

[0112] 28 and 29 , in some embodiments, the air intake housing 2311 includes an air intake hood 23111. The air intake hood 23111 is trumpet-shaped and has openings at both ends. The larger opening of the air intake hood 23111 forms an air inlet, while the smaller opening of the air intake hood 23111 forms an air outlet. This achieves an air collection effect, allowing air to more easily enter the air intake housing 23111. In some embodiments, the air intake hood 23111 is a single-piece annular structure; in other embodiments, the air intake hood 23111 is a spliced ​​structure composed of multiple hoods.

[0113] In some embodiments, at least a portion of the air intake hood 23111 is made of a second thermally conductive material with good thermal conductivity. The first thermally conductive material can be metal or other materials. As long as they have good thermal conductivity, they are within the scope of protection of this application. It should be noted that the second thermally conductive material and the first thermally conductive material can be the same material or different materials. This application is only for the convenience of introduction, so the "first thermally conductive material" and "second thermally conductive material" are used to distinguish. In some embodiments, the air intake hood 23111 includes a thermally conductive portion made of a second thermally conductive material, and the heat sink 233 extends at least partially to the thermally conductive portion. In some embodiments, the air intake hood 23111 includes a thermally conductive portion made of a second thermally conductive material, and the heat sink 233 constitutes the air intake housing 2311.

[0114] Continuing with FIG31 , the blower / suction housing 231 further includes an air inlet mesh cover 240, which is positioned over the air inlet. The air inlet mesh cover 240 includes a solid portion and a mesh portion. The mesh portion allows air to enter the air inlet hood 23111, while the solid portion prevents foreign matter from entering the air inlet hood 23111 along with the air, thereby reducing the malfunction rate of the hair dryer 10. In some embodiments, continuing with FIG26 , the air inlet mesh cover 240 is detachably connected to the housing 100, and the detachable connection method includes, but is not limited to, a connector connection, a snap connection, and the like.

[0115] 32 , in some embodiments, the air intake hood 23111 is a split structure, the air generating housing 2312 is connected to the air intake hood 23111, and a support structure for supporting the motor 2321 is formed within the air generating housing 2312. The fan 2322 and the motor 2321 are both installed within the air generating housing 2312. In some embodiments, the air generating housing 2312 is a plastic component.

[0116] Continuing with reference to FIG. 37 , in some embodiments, the air intake hood 23111 is composed of two parts, and a fixing ring 23114 and a screw column 23113 are respectively provided at the joint of the two parts. The screw passes through the fixing ring 23114 and is threadedly connected in the screw column 23113 to realize the assembly of the two parts.

[0117] It should be noted that the air intake hood 23111, the wind generating shell 2312 and the air intake mesh cover 240 can be an integrally formed part or a spliced ​​structure composed of multiple parts.

[0118] In the embodiment of the present application, the radiator 233 is at least partially made of a first heat-conductive material, and the radiator 233 at least partially extends to the air intake housing 2311. Compared to the technical solution in the related art that only uses air convection to dissipate heat from the control board, the hair dryer 10 provided in the embodiment of the present application accelerates heat conduction at the control board 234 by making the radiator 233 at least partially of the first heat-conductive material. The radiator 233 made of the first heat-conductive material accelerates heat conduction at the control board 234, and by making the radiator 233 at least partially extend to the air intake housing 2311, the air flow speed at the air intake housing 2311 is faster, thereby further accelerating heat conduction at the control board 234. As a result, the hair dryer 10 improves the heat dissipation effect and heat dissipation efficiency of the radiator 233 on the control board 234 as a whole.

[0119] In some embodiments, the entire structure of the heat sink 233 is made of a first thermally conductive material with good thermal conductivity. The first thermally conductive material can be metal or other materials. As long as it has good thermal conductivity, it is within the protection scope of this application.

[0120] In some embodiments, the heat sink 233 is an integral structure; in some other embodiments, the heat sink 233 is a split structure consisting of multiple parts.

[0121] 26 to 38 provide detailed descriptions of the heat sink 233. FIG28 and FIG29 disclose an embodiment of the heat sink 233, FIG30 to FIG33 disclose another embodiment of the heat sink 233, and FIG34 to FIG38 disclose yet another embodiment of the heat sink 233.

[0122] FIG28 and FIG29 show an embodiment of a radiator 233. In this embodiment, the radiator 233 is generally a box-shaped structure that is mounted outside the controller. The control board 234 is disposed within the internal mounting cavity of the radiator 233. The radiator 233 is entirely disposed outside the air intake hood 23111, with at least the wall surface of the radiator 233 contacting the outer surface of the air intake hood 23111. By disposing the radiator 233 outside the air intake hood 23111, the radiator 233 does not interfere with the air duct formed within the air intake hood 23111, thereby reducing wind resistance within the air duct. This allows the control board 234 to be cooled without affecting the overall efficiency of the hair dryer 10.

[0123] In a specific embodiment, continuing to refer to Figure 29, the radiator 233 includes a first heat dissipation part 2331 and a second heat dissipation part 2332. The first heat dissipation part 2331 is cubic and has a box-like structure, and the second heat dissipation part 2332 is in the shape of a heat dissipation fin. The outer wall surfaces of the first heat dissipation part 2331 and the second heat dissipation part 2332 close to the air intake hood 23111 are all in contact with part of the outer annular surface of the air intake hood 23111.

[0124] In another specific embodiment, the radiator 233 is roughly annular in structure, and the radiator 233 is sleeved outside the air intake hood 23111, so that the inner annular surface of the radiator 233 contacts the outer annular surface of the air intake hood 23111.

[0125] Figures 30 to 33 show another embodiment of a heat sink 233. In this embodiment, the heat sink 233 includes a first heat sink 2331 and a second heat sink 2332. The first heat sink 2331 is not exposed to the airflow directed toward the functional component 232; the second heat sink 2332 is exposed to the airflow directed toward the functional component 232 and extends to the air intake housing 2311. In a specific embodiment, the first heat sink 2331 is in a cubic, box-like structure, and the second heat sink 2332 is in the form of heat dissipation fins.

[0126] That is, along the third straight line 103, the edge of the second heat dissipation portion 2332 does not extend beyond the boundary 23116 of the air intake housing 2311. Specifically, the edge of the second heat dissipation portion 2332 may coincide with the boundary 23116 of the air intake housing 2311, or it may be located inside the boundary 23116 of the air intake housing 2311. When the edge of the second heat dissipation portion 2332 coincides with the boundary 23116 of the air intake housing 2311, the heat dissipation area of ​​the heat sink 233 is increased. In one embodiment, along the third straight line 103, the entire structure of the second heat dissipation portion 2332 is located within the boundary 23116 of the air intake housing 2311. That is, the edge of the heat sink 233 is located inside the boundary 23116 of the air intake housing 2311. This arrangement increases the heat dissipation area and minimizes interference between the heat sink 233 and the installation of other components. In one embodiment, the first heat dissipation portion 2331 may extend beyond the boundary 23116 of the air intake housing 2311. In one embodiment, the first heat dissipation portion 2331 is completely mounted to the outside of the wind-generating shell 2312 .

[0127] Continuing with FIG. 31 , in one embodiment, the air intake housing 2311 includes, in addition to the air intake hood 23111, a noise reduction member 23112 disposed on the inner wall of the air intake hood 23111. The heat sink 233 is mounted outside the air intake hood 23111 and is at least partially embedded within the air intake hood 23111 and / or the noise reduction member 23112. This arrangement places at least a portion of the heat sink 233 closer to the air duct within the air intake hood 23111, facilitating faster heat transfer. The noise reduction member 23112 also reduces noise. In one embodiment, the noise reduction member 23112 is a sponge; however, in other embodiments, the noise reduction member 23112 may be made of other materials.

[0128] 31 , in one embodiment, the surface of the heat sink 233 facing the central axis of the air intake hood 23111 is flush with the surface of the noise reduction member 23112 facing the central axis of the air intake hood 23111. This arrangement prevents the heat sink 233 from protruding into the air duct, thereby preventing increased wind resistance and reducing energy consumption of the hair dryer 10.

[0129] Continuing with reference to FIG. 33 , in a specific embodiment, the blowing and suction shell 231 forms a partial air duct, and a partial structure of the radiator 233 is exposed in the air duct, for example, the second heat dissipation portion 2332 is exposed in the air duct. This arrangement allows a partial structure of the radiator 233 to directly contact the wind in the air duct, which is beneficial for further improving the heat dissipation effect. It should be noted that a mounting notch can be partially formed corresponding to the air intake hood 23111 and the noise reduction component 23112, and a partial structure of the radiator 233 is filled in the mounting notch. The inner wall surface of the radiator 233 located on the inner side of the mounting notch is flush with the inner annular surface of the noise reduction component 23112, and the outer wall surface of the radiator 233 located on the outer side of the mounting notch is flush with the outer annular surface of the air intake hood 23111, or the outer wall surface of the radiator 233 located on the outer side of the mounting notch protrudes from the outer annular surface of the air intake hood 23111.

[0130] In one embodiment, the noise reducing member 23112 is an integral ring structure. In another embodiment, as shown in FIG32 , the noise reducing member 23112 is a spliced ​​structure composed of multiple sponge blocks.

[0131] As shown in Figures 34 to 38, there is another embodiment of the radiator 233. In this embodiment, the radiator 233 is roughly annular in structure. The radiator 233 is directly mounted between the wind-generating shell 2312 and the air intake shell 2311. This arrangement enables the radiator 233 to be directly installed without changing the structure of other components of the hair dryer 10.

[0132] In one specific embodiment, as shown in Figures 34 and 35 , the heat sink 233 is partially located within the air duct formed by the suction and air blowing housing 231, while partially located outside the suction and air blowing housing 231. Specifically, as shown in Figure 36 , the heat sink 233 includes an annular second heat sink 2332, a plate-shaped first heat sink 2331 disposed outside the second heat sink 2332, and a connecting plate for connecting the second heat sink 2332 and the first heat sink 2331. The second heat sink 2332 is disposed within the suction and air blowing housing 231 and is positioned at the junction of the air intake housing 2311 and the airflow generating housing 2312. The connecting plate extends through the gap between the air intake housing 2311 and the airflow generating housing 2312, allowing the first heat sink 2331 to be positioned outside the air intake housing 2311 and the airflow generating housing 2312. In one specific embodiment, the first heat sink 2331 is disposed outside the suction and air blowing housing 231.

[0133] To position the second heat dissipation portion 2332 of the radiator 233, a retaining ring groove is formed on the inner wall of the air intake hood 23111 and the air generating housing 2312. The second heat dissipation portion 2332 of the radiator 233 is retained within the mounting groove formed by the two retaining ring grooves. This arrangement improves the installation stability of the radiator 233 and facilitates quick assembly.

[0134] In a specific embodiment, at least a portion of the radiator 233 is made of a third thermally conductive material with good thermal conductivity. It should be noted that the third thermally conductive material and the second thermally conductive material and the first thermally conductive material can be the same material or different materials. This application is only for the convenience of introduction, so the "first thermally conductive material", "second thermally conductive material" and "third thermally conductive material" are used to distinguish them. In a specific embodiment, the second heat dissipation part 2332 is an annular structure made of a good thermally conductive material. For example, the second heat dissipation part 2332 can be a metal part, such as an aluminum ring. In another specific embodiment, the blowing and suction shell 231 and the second heat dissipation part 2332 are made of different materials.

[0135] In a specific embodiment, as shown in Figure 36 , the wind-generating housing 2312 and the annular second heat dissipation portion 2332 are loosely coupled, which reduces assembly difficulty. To ensure assembly strength, after the wind-generating housing 2312, heat sink 233, and air intake condenser 23111 are plugged together, a connector can be used to detachably connect the wind-generating housing 2312 and the air intake condenser 23111.

[0136] In one specific embodiment, as shown in FIG37 , the air intake housing 2311 includes an air intake shroud 23111, a noise reduction member 23112, and a sponge lining (not shown) for supporting the noise reduction member 23112. The sponge lining is detachably connected to the radiator 233. Removable connection methods include, but are not limited to, screw connections and snap connections. In one specific embodiment, the sponge lining is secured to the radiator 233 via screws, such that the radiator 233 cannot be separated without removing the screws.

[0137] In addition to using the aforementioned heat sink 233 to accelerate heat dissipation at the control board 234, in one embodiment, at least one of the air intake hood 23111, the air generating housing 2312, and the air intake mesh cover 240 can be made of a material with good thermal conductivity, so that the air intake hood 23111, the air generating housing 2312, and the air intake mesh cover 240 can be used as another heat sink 233, thereby enabling the air intake hood 23111, the air generating housing 2312, and the air intake mesh cover 240 to assist in heat conduction of the heating elements on the control board 234. In another embodiment, in addition to the heat sink 233, at least part of the structure of the control board 234 can also be directly placed in the air duct, thereby achieving dual heat dissipation.

[0138] Continuing with reference to Figures 1 and 2, in some embodiments, the hair dryer 10 is a backpack-type hair dryer, which is fixed to the user's side through a shoulder strap structure 20, thereby enabling the user to flexibly operate the hair dryer 10 and reducing the burden on the user to operate the hair dryer 10.

[0139] In addition to the two straps, the strap structure 20 also includes an assembly structure for assembling with the housing 100 of the hair dryer 10. In some embodiments, as shown in Figures 2 and 27, the assembly structure is a plug hole 201. The housing 100 is provided with a plug protrusion 160. The plug protrusion 160 and the plug hole 201 are plugged together to achieve the assembly of the strap structure 20 and the hair dryer 10. When storing, the hair dryer 10 and the strap structure 20 can be disassembled and stored separately. Of course, in other embodiments, the arrangement positions of the plug protrusion 160 and the plug hole 201 can be interchanged, that is, the plug hole 201 is provided on the housing 100, and the plug protrusion 160 is provided on the strap structure 20.

[0140] In some embodiments, a battery pack is further provided on the shoulder strap structure 20, and the battery pack can power the motor 2321 in the hair dryer 10, thereby improving the convenience of electricity use of the hair dryer 10. Furthermore, as shown in FIG2 , two battery mounting positions 202 for mounting the battery pack are provided on the shoulder strap structure 20, and the battery pack is installed in the battery mounting positions 202 by plugging. It should be noted that some electrical connectors 203 are also provided in the shoulder strap structure 20, so that after the battery pack is installed in the battery mounting position 202, the hair dryer 10 can be directly powered by the battery pack by touching the power button.

[0141] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A hair dryer, comprising: connected in sequence: A first part, forming an air outlet; A second part, which can be bent, with a straight line as the central axis; A third part, including a fan, the fan rotates around the fan axis to form an air flow; The second part includes an inner surface, and the inner surface forms a channel for the air flow to pass through; There is a plane P passing through the central axis. On the plane P, the point on the inner surface farthest from the central axis is the first point F, and the point on the inner surface closest to the central axis is the second point E. The difference between the distances from the first point F and the second point E to the central axis respectively is the distance difference d, and the distance difference d is less than or equal to 8 mm.

2. The hair dryer according to claim 1, wherein, The second part includes a first connecting part and a spiral part, and the spiral part is coiled outside the first connecting part.

3. The hair dryer according to claim 1, wherein, The distance difference d is less than or equal to 5 mm.

4. The hair dryer according to claim 1, wherein, For any plane P passing through the central axis, the distance difference d is less than or equal to 2 mm.

5. The hair dryer according to claim 2, wherein, The first connecting part and the spiral part are of an integrally formed structure, or the first connecting part and the spiral part are bonded.

6. The hair dryer according to claim 2, wherein The spiral part is a layered structure, and the spiral part includes at least one of a metal layer and a plastic layer; And / or, the first connecting part is a layered structure, and the first connecting part includes a TPU layer.

7. The hair dryer according to claim 2, further comprising a connector, the connector docks the second part with the first part or the third part, and the connector is sleeved on the end of the first connecting part.

8. The hair dryer according to claim 7, wherein, The end of the spiral part is embedded in the connector. The connector includes a first connector and a second connector. The first connector and the second connector are respectively sleeved on both ends of the first connecting part. The first connector is inserted into the first part, and the second connector is inserted into the third part.

9. The hair dryer according to claim 1, further comprising a first coupling part, the first coupling part mounts and locks the second part and the third part; the first coupling part includes a first outer coupling part, a second outer coupling part and a first inner coupling part. The first inner coupling part is at least partially screwed into the second part and at least partially extends into the third part. The first outer coupling part can rotate relative to the second outer coupling part. When the first outer coupling part and the second outer coupling part are rotated to be closed, the first coupling part locks the second part and the third part.

10. The hair dryer according to claim 2, wherein, The pitch a between adjacent turns of the spiral part in the natural extended state is greater than or equal to 5 mm and less than or equal to 50 mm.

11. The hair dryer according to claim 2, wherein, The overall length b of the first connecting part in the natural extended state is greater than or equal to 100 mm and less than or equal to 500 mm.

12. The hair dryer according to claim 2, wherein, The thickness H of the first connecting part in the natural extended state is less than or equal to 3 mm.

13. The hair dryer according to claim 2, wherein, The second part further includes a second connecting part, and the second connecting part is wrapped outside the spiral part.

14. The hair dryer according to claim 1, wherein, For any plane P passing through the central axis, the section line of the section formed by the plane P passing through the second part on the inner surface is substantially a straight line.

15. The hair dryer according to claim 1, wherein, The third part is used for air intake and wind generation. The third part further includes a motor and an air rectifier. The motor is capable of driving the fan to rotate, and the air rectifier is used for guiding the air flow.

16. The hair dryer according to any one of claims 1 to 15, wherein, At least a part of the second part is made by a thermoplastic process.

17. A power tool, comprising a first part, a flexible second part, and a third part connected in sequence. The first part, the second part, and the third part all extend with a first straight line as the central axis; The second part includes a first communication part, a spiral part, and a second communication part. The spiral part is coiled outside the first communication part, and the second communication part is wrapped outside the spiral part; The inner side of the first communication part has an inner surface, and the inner surface forms a channel for the flow of air or liquid. There is a plane P passing through the central axis. On the plane P, the point on the inner surface farthest from the central axis is the first point F, and the point on the inner surface closest to the central axis is the second point E. The difference between the distances from the first point F and the second point E to the central axis respectively is the distance difference d, and the distance difference d is less than or equal to 8 millimeters.

18. The power tool according to claim 17, further comprising a connector that docks the second part with the first part or the third part. The connector is sleeved on the end of the second part.

19. The power tool according to claim 18, wherein, The end of the spiral part is embedded in the connector. The connector includes a first connector and a second connector. The first connector and the second connector are respectively sleeved on both ends of the first communication part. The first connector is inserted into the first part, and the second connector is inserted into the third part.

20. The power tool according to claim 19, further comprising a first coupling part that mounts and locks the second part and the third part; the first coupling part includes a first outer coupling part, a second outer coupling part, and a first inner coupling part. The first inner coupling part is at least partially screwed into the second part and at least partially extends into the third part. The first outer coupling part can rotate relative to the second outer coupling part. When the first outer coupling part and the second outer coupling part are rotated to be closed, the first coupling part locks the second part and the third part.

21. A device for allowing the flow of liquid or gas, comprising a first part, a flexible second part, and a third part connected in sequence. The first part, the second part, and the third part all extend with a first straight line as the central axis; The second part includes a first communication part, a spiral part, and a second communication part. The spiral part is coiled outside the first communication part, and the second communication part is wrapped outside the spiral part; The inner side of the first connecting part has an inner surface, and the inner surface forms a channel for the flow of air or liquid; there is a plane P passing through the central axis. On the plane P, the point on the inner surface farthest from the central axis is the first point F, and the point on the inner surface closest to the central axis is the second point E. The difference between the distances from the first point F and the second point E to the central axis respectively is the distance difference d, and the distance difference d is less than or equal to 8 millimeters.

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