Hair drier

Abstract

The utility model provides a hair drier, and relates to the related technical field of hair treatment equipment. The blower comprises a shell, the shell is of a cylindrical structure, a mounting opening is formed in the first end of the shell, a fan air outlet is formed in the second end of the shell, and a positioning mounting cylinder matched with the inner circumferential wall of the shell to form an annular mounting gap is arranged in the second end of the shell; the inner shell is of a cylindrical structure, the first end of the inner shell is nested in the outer shell in a sliding mode through the mounting opening, and a fan air inlet is formed in the second end of the inner shell; the heating assembly is arranged on the positioning mounting cylinder in a sleeving manner; the air supply assembly is arranged in the inner shell and used for conveying air to the fan air outlet through the fan air inlet. And in the relative sliding process of the inner shell and the outer shell, the air supply assembly can synchronously move along with the inner shell so as to stretch into or retreat from the positioning mounting barrel. By optimizing the shell and the internal structure of the hair dryer, compared with a portable hair dryer in the market, the portable hair dryer is smaller in size and convenient to carry by a user.

Description

TECHNICAL FIELD

[0001] The utility model relates to hair processing equipment related technical field, especially a kind of hair dryer. BACKGROUND

[0002] In related art, portable hair dryer is a small and light hair dryer, which is easy to carry and use. They are usually small in size and light in weight, suitable for travel or use when going out. Although portable hair dryer may not be as powerful as household large hair dryer, it can still provide enough heat to quickly dry hair.

[0003] However, the portable hair dryer on the market can also achieve folding function, but the size is still large after folding, and the portable function cannot be truly realized. UTILITY MODEL CONTENT

[0004] Therefore, the purpose of the present application is to provide a hair dryer to solve the technical problem of large space occupation of the existing hair dryer, which leads to difficulty in carrying.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] The present application provides a hair dryer, which comprises:

[0007] A shell in a cylindrical structure, a first end of the shell forms a mounting port, a second end of the shell forms a fan air outlet, and the second end of the shell is internally provided with a positioning mounting cylinder cooperating with the inner peripheral wall of the shell to form an annular mounting gap;

[0008] An inner shell in a cylindrical structure, a first end of the inner shell is slidably nested in the outer shell through the mounting port, and a second end of the inner shell forms a fan air inlet;

[0009] A heating assembly is sleeved on the positioning mounting cylinder;

[0010] A blowing assembly is arranged in the inner shell for conveying air to the fan air outlet through the fan air inlet;

[0011] During the relative sliding of the inner shell and the outer shell, the blowing assembly can move synchronously with the inner shell to extend into or withdraw from the positioning mounting cylinder.

[0012] According to some embodiments of the present application, a first hollow structure is formed on the peripheral side wall of the positioning mounting cylinder.

[0013] According to some embodiments of the present application, an inner cylinder is arranged in the outer shell.

[0014] The inner cylinder cooperates with the inner side wall of the shell to form a first annular gap, and the first annular gap is used for positioning a first end of the inner shell; the inner cylinder cooperates with the positioning and mounting cylinder to form a second annular gap, and the second annular gap is used for mounting the heat generating assembly.

[0015] According to some embodiments of the present application,

[0016] The first end of the shell is provided with a first annular limiting protrusion.

[0017] The first end of the inner shell is provided with a second annular limiting protrusion, and the second annular limiting protrusion is used for cooperating with the first annular limiting protrusion to limit the position of the inner shell sliding out of the shell.

[0018] According to some embodiments of the present application, the second end of the shell is provided with a third annular limiting protrusion, and the third annular limiting protrusion is used for cooperating with the second annular limiting protrusion to limit the position of the inner shell sliding into the shell.

[0019] According to some embodiments of the present application, the heat generating assembly comprises:

[0020] An outer ring cylinder;

[0021] An inner ring cylinder, which is sleeved on the outer circumferential side of the positioning and mounting cylinder, and the inner ring cylinder is coaxially sleeved with the outer ring cylinder to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder;

[0022] A heat generating wire, which is uniformly arranged in the annular heat exchange gap.

[0023] According to some embodiments of the present application, the circumferential side wall of the inner ring cylinder is provided with a second hollow structure, and the second hollow structure corresponds to the first hollow structure.

[0024] According to some embodiments of the present application, the heat generating assembly comprises:

[0025] An outer ring cylinder;

[0026] An inner ring cylinder, which is sleeved on the outer circumferential side of the positioning and mounting cylinder, and the inner ring cylinder is coaxially sleeved with the outer ring cylinder to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder;

[0027] A heat generating wire, which is uniformly arranged in the annular heat exchange gap.

[0028] The diameter of the inner ring cylinder is greater than the diameter of the positioning installation cylinder, so as to form an annular air supply channel between the inner circumferential wall of the inner ring cylinder and the outer circumferential wall of the positioning installation cylinder; the first end of the inner ring cylinder is connected to the inner side wall of the first end of the outer shell, and the first end of the inner ring cylinder is provided with a ventilation hole for connecting the annular air supply channel and the inside of the inner ring cylinder.

[0029] According to some embodiments of the present application, the inner side wall of the second end of the outer shell is convexly formed into a hemispherical protrusion, which is used in cooperation with the ventilation hole to guide the air supplied into the positioning installation cylinder through the air supply assembly into the annular air supply channel.

[0030] According to some embodiments of the present application, the second end of the positioning installation cylinder is provided with a flow guide flange, which is used to guide the air supplied through the annular air supply channel into the annular heat exchange gap.

[0031] According to some embodiments of the present application, the inner side of the second end of the inner shell is provided with a fan installation cylinder corresponding to the fan air inlet, which is used to install the air supply assembly.

[0032] The diameter of the fan installation cylinder is less than the diameter of the positioning installation cylinder.

[0033] According to some embodiments of the present application, the fan air outlet is an arc-shaped slot formed in the second end of the outer shell, wherein the arc-shaped slot corresponds to the second annular gap.

[0034] According to some embodiments of the present application, the hair dryer further comprises a handle, one end of the handle being rotatably connected into a handle accommodating groove in the second end of the inner shell.

[0035] The handle has a first state of being accommodated in the handle accommodating groove, and a second state of being rotated and opened outside the handle accommodating groove.

[0036] In the above technical solution, a hair dryer is provided, and the hair dryer shell (the outer shell and the inner shell) and the internal structure thereof are improved, so that the hair dryer as a whole can be adjusted in length. When the hair dryer is not used, the shell can be contracted, and at the same time, the air supply assembly can be placed in the gap of the positioning installation cylinder for fixing the heating assembly, so as to effectively reduce the overall size of the hair dryer. When the hair dryer is used, only the length of the hair dryer body needs to be adjusted. Compared with the portable hair dryers on the market, the hair dryer is smaller in size and more convenient for users to carry. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0038] Figure 1 is a schematic diagram of a hair dryer according to an exemplary embodiment Figure 1 ;

[0039] Figure 2 is a schematic diagram of a hair dryer according to an exemplary embodiment Figure 2 ;

[0040] Figure 3 is a top view of a hair dryer according to an exemplary embodiment

[0041] Figure 4 is Figure 3 an A-A sectional view

[0042] Figure 5 is an exploded view of a hair dryer according to an exemplary embodiment

[0043] Figure 6 is a schematic diagram of a hair dryer according to an exemplary embodiment, in which a ring-shaped air supply passage is formed inside the hair dryer.

[0044] In the drawings:

[0045] 10, housing; 101, fan air outlet; 102, positioning mounting cylinder; 1021, flow guide flange; 103, first ring-shaped limiting protrusion; 104, third ring-shaped limiting protrusion; 105, inner cylinder; 106, hemispherical protrusion;

[0046] 20, inner housing; 201, fan air inlet; 202, fan mounting cylinder; 203, second ring-shaped limiting protrusion; 204, handle accommodating groove;

[0047] 30, heating assembly; 301, outer ring cylinder; 302, inner ring cylinder; 303, heating wire; A, ring-shaped air supply passage;

[0048] 40, air supply assembly;

[0049] 50, handle. DETAILED DESCRIPTION

[0050] The present application will be further described in detail through the drawings and embodiments. Through these descriptions, the features and advantages of the present application will become more apparent.

[0051] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Unless specifically indicated otherwise, the drawings are not necessarily to scale.

[0052] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0053] In the related art, portable hair dryers are designed to be small and lightweight, making them easy to carry and use. They are usually small in size and light in weight, suitable for travel or use when going out. Although portable hair dryers may not be as powerful as large household hair dryers, they can still provide enough heat to quickly dry hair. However, the portable hair dryers on the market today, although they also have folding functions, the size is still large after folding, and cannot truly realize the function of portability.

[0054] The present application provides a hair dryer, by improving the hair dryer shell (outer shell and inner shell) and its internal structure, so that the hair dryer can realize telescopic adjustment, when not using the hair dryer, the air supply assembly can be placed in the positioning installation cylinder gap used to fix the heating assembly while the shell is retracted, thereby effectively reducing the overall size of the hair dryer; when using the hair dryer, only need to lengthen the hair dryer body, compared with the size of the portable hair dryer on the market, it is more compact and convenient for users to carry.

[0055] The technical solutions of the embodiments will be described in detail below in conjunction with the drawings. In the case of no conflict, the following embodiments and implementation manners can be combined with each other.

[0056] In an exemplary embodiment of the present application, a hair dryer is provided, as shown in Figures 1-4 The hair dryer includes an outer shell 10, an inner shell 20, a heating assembly 30, and an air supply assembly 40, etc.

[0057] The outer shell 10 and the inner shell 20 cooperate to form a containing cavity of the hair dryer, and the heat generating assembly 30 and the air supply assembly 40 and other structures are installed through the containing cavity. In order to realize the telescopic function of the shell as a whole, the outer shell 10 and the inner shell 20 can both adopt a cylindrical structure. Specifically, the outer shell 10 adopts a cylindrical structure, the first end of the outer shell 10 forms a mounting port, the second end of the outer shell 10 forms a fan air outlet 101, and the second end of the outer shell 10 is internally provided with a positioning and mounting cylinder 102 which cooperates with the inner circumferential wall of the outer shell 10 to form an annular mounting gap; the inner shell 20 adopts a cylindrical structure which is adapted to the outer shell 10, the first end of the inner shell 20 is slidably nested in the outer shell 10 through the mounting port, and the second end of the inner shell 20 forms a fan air inlet 201. When the heat generating assembly 30 is fixed, the heat generating assembly 30 can be sleeved on the outer circumferential side of the positioning and mounting cylinder 102. The air supply assembly 40 is arranged in the inner shell 20 and is used to deliver air to the fan air outlet 101 through the fan air inlet 201. During the relative sliding of the inner shell 20 and the outer shell 10, the air supply assembly 40 can move synchronously with the inner shell 20 to extend into or withdraw from the positioning and mounting cylinder 102.

[0058] In the present embodiment, since the outer shell 10 and the inner shell 20 which constitute the shell of the hair dryer can be relatively slidably matched, the hair dryer as a whole can realize telescopic adjustment. When the hair dryer is not used, the air supply assembly 40 (including a motor and the like) can be placed in the gap of the positioning and mounting cylinder 102 which is used to fix the heat generating assembly 30 while the shell is contracted, so that the internal space can be effectively contracted, thereby effectively reducing the overall size of the hair dryer. When the hair dryer is used, it is only needed to lengthen the body of the hair dryer, and in this state, the hair dryer can be normally used. Compared with the portable hair dryers on the market, the hair dryer is smaller and more convenient to carry.

[0059] In some example embodiments, since the internal space of the hair dryer is small, and the positioning and mounting cylinder 102 has a great influence on the air supply path and flow rate in both states that the air supply assembly 40 is inside or outside the positioning and mounting cylinder 102, in order to ensure the smoothness of air supply of the air supply assembly 40, the positioning and mounting cylinder 102 can be improved. For example, as shown in Figure 4 the peripheral side wall of the positioning and mounting cylinder 102 is provided with a first hollow structure. Based on the first hollow structure formed on the positioning and mounting cylinder, the air delivered by the air supply assembly 40 can be delivered to the heat generating assembly 30 as soon as possible, and the cold air delivered by the air supply assembly 40 can be heated to hot air after absorbing the heat on the heat generating assembly 30.

[0060] Optionally, ventilation holes are evenly arranged on the outer circumferential side of the positioning mounting cylinder 102, so that the cold air delivered by the air delivery assembly 40 can fully contact the heat generating assembly 30, so that the two can better realize heat exchange, and the stability of the air delivery temperature is improved. It should be noted that the size, number and shape of the ventilation holes can be adjusted according to actual needs, and the shape of the ventilation holes includes but is not limited to at least one of a round hole, a square hole, a rhombic hole and a triangular hole.

[0061] In some example embodiments, as shown in Figure 4 The inner cylinder 106 is arranged in the shell 10. Specifically, the inner cylinder 106 cooperates with the inner side wall of the shell 10 to form a first annular gap, and the first annular gap is used to position the first end of the inner shell 20; the inner cylinder 106 cooperates with the positioning mounting cylinder 102 to form a second annular gap, and the second annular gap is used to mount the heat generating assembly 30.

[0062] In this embodiment, based on the inner cylinder 106 arranged on the inner side of the shell 10, the shell 10 cooperates with the inner cylinder 106 to obtain a double-layer structure with a first annular gap, and the double-layer structure is used as a telescopic structure to cooperate with the first end of the inner shell 20, that is, the first end of the inner shell 20 is nested in the first annular gap and can realize sliding telescoping.

[0063] In some example embodiments, considering that the inner shell 20 and the shell 10 will slide relative to each other, the depth of the first end of the inner shell 20 embedded in the first annular gap needs to be limited, so as to avoid that the inner shell 20 completely slides out of the shell 10 after the hair dryer is stretched open. For example, as shown in Figure 4 The first end of the inner shell 20 is provided with a second annular limiting protrusion 203, and the second annular limiting protrusion 203 is used to cooperate with the first annular limiting protrusion 103 to limit the position of the inner shell 20 sliding out of the shell 10. Specifically, an annular groove is arranged on the first annular limiting protrusion 103, and when the inner shell 20 is stretched, the second annular limiting protrusion 203 is clamped in the annular groove, so that the first end of the inner shell 20 is limited in the first end of the shell 10, and the two do not slide relative to each other.

[0064] Further optionally, considering that the inner shell 20 and the shell 10 of the hair dryer can also not be kept in the contracted state, affecting the user experience, other limiting protrusions can also be added to limit the first end of the inner shell 20 in the first annular gap close to the second end of the shell 10. For example, the second end of the shell 10 is provided with a third annular limiting protrusion 104, and the third annular limiting protrusion 104 is used to cooperate with the second annular limiting protrusion 203 to limit the position of the inner shell 20 sliding into the shell 10.

[0065] In some example embodiments, since the inner shell 20 and the outer shell 10 are both cylindrical structures, and the positioning installation cylinder 102 is arranged inside the outer shell 10 to accommodate the air supply assembly 40 when the hair dryer is in the collapsed state, the inner cavity formed by the cooperation of the inner shell 20 and the outer shell 10 is an annular inner cavity. Based on this, the heat generating assembly 30 can also be designed as an annular structure, for example, as shown in Figure 5 The heat generating assembly 30 includes an outer ring cylinder 301, an inner ring cylinder 302, and heat generating wires 303. The inner ring cylinder 302 is sleeved on the outer peripheral side of the positioning installation cylinder 102, and the inner ring cylinder 302 is coaxially sleeved with the outer ring cylinder 301 to form an annular heat exchange gap between the inner ring cylinder 302 and the outer ring cylinder 301. The heat generating wires 303 are uniformly arranged in the annular heat exchange gap.

[0066] In some example embodiments, in order to achieve the installation and fixation of the air supply assembly 40, a corresponding installation portion can be arranged in the inner shell 20 to fix it. For example, the installation portion can be designed as a cylindrical structure fixed on the inner side of the second end of the inner shell 20. Specifically, the inner side of the second end of the inner shell 20 is provided with a fan installation cylinder 202 corresponding to the fan air inlet 201, and the fan installation cylinder 202 is used to install the air supply assembly 40. The diameter of the fan installation cylinder 202 is smaller than the diameter of the positioning installation cylinder 102, so as to ensure that the fan installation cylinder 202 can slide into or out of the positioning installation cylinder 102.

[0067] The first end of the inner ring cylinder 302 is connected to the inner side wall of the first end of the outer shell 10. Considering that the air outlet port formed by the fan installation cylinder 202 faces the inside of the positioning installation cylinder 102, in order to improve the heat exchange effect and ensure the smoothness of the air supply of the air supply assembly 40, a hollow structure can also be formed on the inner ring cylinder 302. For example, a second hollow structure is formed on the peripheral wall of the inner ring cylinder 302, and the second hollow structure corresponds to the first hollow structure. Since the hollow structures are arranged on the inner ring cylinder 302 and the fan installation cylinder 102, the hot air can flow out quickly, and at the same time, the temperature of the inner ring cylinder 302 and the outer ring cylinder 301 in the heat generating assembly can be quickly reduced, avoiding the residual high temperature in the hair dryer shell and reducing or avoiding the influence on the service life of the motor and other devices in the air supply assembly 40.

[0068] Further, the outer ring cylinder 301 can also be kept a certain distance from the inner cylinder 106 inside the outer shell 10, so as to avoid direct heat conduction from the outer ring cylinder 301 to the inner cylinder 106, thereby avoiding overheating of the outer shell 10 affecting the user experience. It should be noted that the inner cylinder 106 can also be made of a material that is not easy to conduct heat and has a certain heat insulation effect.

[0069] In another alternative way, as shown in Figure 6As shown, no first hollow structure is arranged on the peripheral wall of the positioning installation cylinder 102, and the diameter of the inner ring cylinder 302 is designed to be larger than that of the positioning installation cylinder 102, so as to form an annular air supply channel A between the inner peripheral wall of the inner ring cylinder 302 and the outer peripheral wall of the positioning installation cylinder 102. The first end of the inner ring cylinder 302 is connected to the inner side wall of the first end of the outer shell 10, and a ventilation hole is arranged at the first end of the inner ring cylinder 302, which is used to communicate the annular air supply channel A with the inside of the inner ring cylinder 302.

[0070] Based on the existence of the annular air supply channel A, direct heat conduction between the positioning installation cylinder 102 and the inner ring cylinder 302 can also be avoided, thereby preventing the remaining high temperature of the positioning installation cylinder 102 from affecting the service life of the motor and other devices in the air supply assembly 40 after the inner shell 20 and the outer shell 10 are contracted.

[0071] In the embodiment, no hollow structure is arranged in the positioning installation cylinder 102, the inner ring cylinder 302 and the outer ring cylinder 301 in the heating assembly 30, and the central part of the second end of the outer shell 10 is recessed to form a hemispherical protrusion 106 on the inner side of the second end of the outer shell 10. In this way, the air supplied into the positioning installation cylinder 102 by the air supply assembly 40 is guided and discharged through the annular air supply channel A. Specifically, when the outer shell 10 and the inner shell 20 are in a stretched state, the air first enters the fan air inlet 201 of the first end of the inner shell 20, then enters the positioning installation cylinder 102 through the air supply assembly 40 (at this time, the positioning installation cylinder 102 is separated from the air supply assembly 40), and then reaches the hemispherical protrusion 106 and is branched to enter the annular air supply channel A. Then, the air enters the annular heat exchange gap between the inner ring cylinder 302 and the outer ring cylinder 301 to exchange heat with the heating wire 303. Finally, the heated air is blown out from the fan air outlet 101 of the outer shell 10.

[0072] Further optionally, as shown in Figure 6 , a flow guide folding edge 1021 can also be arranged at the second end of the positioning installation cylinder 102 (i.e., the end close to the fan air inlet 201), so as to guide the air supplied through the annular air supply channel A into the annular heat exchange gap, thereby increasing the air supply smoothness of the air supply assembly 40.

[0073] In some example embodiments, as shown in Figure 1 , Figure 5 , the fan air outlet 101 is an arc-shaped slit arranged at the second end of the outer shell 10, wherein the arc-shaped slit corresponds to the second annular gap.

[0074] It should be noted that the shape of the fan air outlet can be adjusted and designed according to the size of the second end of the outer shell 10 and actual needs, which can be the arc-shaped slit in the above embodiments, or a circle of uniformly distributed air outlets arranged at the second end of the outer shell 10. The shape of the air outlet includes but is not limited to at least one of the hole types such as a round hole, a square hole and a triangular hole.

[0075] In some example embodiments, as shown in Figure 2 The handle 50 is rotatably connected to the handle accommodating groove 204 at the second end of the inner shell 20. The handle 50 has a first state of being accommodated in the handle accommodating groove 204 and a second state of being rotated out of the handle accommodating groove 204.

[0076] In the present embodiment, the outer shell 10 houses the heating assembly 30 and the inner shell 20 houses the air supply assembly 40. When the outer shell 10 and the inner shell 20 are in the stretched state, the first end of the inner shell 20 is embedded in the first annular gap and the first end of the inner shell 20 is correspondingly positioned at the first end of the outer shell 10. When the outer shell 10 and the inner shell 20 are in the contracted state, the first end of the inner shell 20 is embedded in the first annular gap and the first end of the inner shell 20 is correspondingly positioned at a position close to the second end of the outer shell 10. The handle 50 is foldably connected to the second end of the inner shell 20 and is accommodated in the handle accommodating groove 204 at the second end of the inner shell 20 when the handle 50 is folded.

[0077] Based on the relative sliding fit of the outer shell 10 and the inner shell 20, the overall hair dryer can be adjusted in length. When the hair dryer is not in use, the air supply assembly 40 can be placed in the positioning installation cylinder 102 gap for fixing the heating assembly 30 while the shell is contracted, the internal space is effectively contracted, and the handle 50 is folded and accommodated in the handle accommodating groove 204, thereby effectively reducing the overall size of the hair dryer. When the hair dryer is in use, the handle 50 can be unfolded in the handle accommodating groove 204 and the body of the hair dryer can be lengthened. In this state, the hair dryer can be normally used. Compared with the portable hair dryers on the market, the hair dryer is smaller and more convenient to carry.

[0078] In addition, when the handle 50 is folded and accommodated in the handle accommodating groove 204 at the second end of the inner shell 20, the air inlet can also be blocked. When the hair dryer is not in use, the air inlet 201 of the hair dryer can be blocked to prevent dust from entering.

[0079] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship based on the working state of the present application, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0080] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0081] The application has been described above with the reference made to preferred embodiments, but these are merely exemplary and serve only to illustrate the application. On the basis of this, various substitutions and modifications can be made to the application, which all fall within the scope of protection of the application.

Claims

1. A hair dryer characterized by, The hair dryer comprises: a shell in a cylindrical structure, a first end of the shell forms a mounting port, a second end of the shell forms a fan air outlet, and the inside of the second end of the shell is provided with a positioning mounting cylinder cooperating with the inner circumferential wall of the shell to form an annular mounting gap; the shell is internally provided with an inner cylinder; wherein the inner cylinder cooperates with the inner side wall of the shell to form a first annular gap, an inner shell in a cylindrical structure, the first end of the inner shell is slidably nested in the shell through the mounting port, and the second end of the inner shell forms a fan air inlet; the first annular gap is used for positioning and nesting the first end of the inner shell; a heating assembly sleeved on the positioning mounting cylinder; an air supply assembly arranged in the inner shell for conveying air to the fan air outlet through the fan air inlet; wherein during the relative sliding of the inner shell and the shell, the air supply assembly can move synchronously with the inner shell to extend into or exit from the positioning mounting cylinder.

2. The hair dryer of claim 1, wherein The circumferential wall of the positioning mounting cylinder is provided with a first hollow structure.

3. The hair dryer of claim 2, wherein, The inner cylinder cooperates with the positioning mounting cylinder to form a second annular gap, and the second annular gap is used for mounting the heating assembly.

4. The hair dryer according to claim 1, wherein the first end of the shell is provided with a first annular limiting protrusion on the inner side wall; the first end of the inner shell is provided with a second annular limiting protrusion on the outer side wall, and the second annular limiting protrusion is used for cooperating with the first annular limiting protrusion to limit the position of the inner shell sliding out of the shell.

5. The hair dryer of claim 4, wherein, the second end of the shell is provided with a third annular limiting protrusion on the inner side wall, and the third annular limiting protrusion is used for cooperating with the second annular limiting protrusion to limit the position of the inner shell sliding into the shell.

6. The hair dryer of claim 3, wherein The heating assembly comprises: an outer ring cylinder; an inner ring cylinder, the inner ring cylinder is sleeved on the outer circumferential side of the positioning mounting cylinder, and the inner ring cylinder is coaxially sleeved with the outer ring cylinder to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder; heating wires uniformly arranged in the annular heat exchange gap.

7. The hair dryer of claim 6, wherein The circumferential wall of the inner ring cylinder is provided with a second hollow structure, wherein the second hollow structure corresponds to the first hollow structure.

8. The hair dryer of claim 1, wherein, The heating assembly comprises: an outer ring cylinder; an inner ring cylinder, the inner ring cylinder is sleeved on the outer circumferential side of the positioning mounting cylinder, and the inner ring cylinder is coaxially sleeved with the outer ring cylinder to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder; heating wires uniformly arranged in the annular heat exchange gap; wherein the diameter of the inner ring cylinder is greater than the diameter of the positioning mounting cylinder, so as to form an annular air supply channel between the inner circumferential wall of the inner ring cylinder and the outer circumferential wall of the positioning mounting cylinder; the first end of the inner ring cylinder is connected to the first end inner side wall of the shell, and the first end of the inner ring cylinder is provided with a ventilation hole for communicating the annular air supply channel with the inside of the inner ring cylinder.

9. The hair dryer of claim 8, wherein, The second end inner side wall of the shell protrudes to form a hemispherical protrusion, and the hemispherical protrusion is used for cooperating with the ventilation hole to guide the air conveyed into the positioning mounting cylinder by the air supply assembly into the annular air supply channel.

10. The hair dryer of claim 9, wherein, The second end of the positioning installation cylinder is provided with a flow guide flange, which is used for guiding the air sent out through the annular air supply channel into the annular heat exchange gap.

11. The hair dryer of claim 1, wherein, The inner side of the second end of the inner shell is provided with a fan installation cylinder corresponding to the fan air inlet, which is used for installing the air supply assembly. The diameter of the fan installation cylinder is smaller than the diameter of the positioning installation cylinder.

12. The hair dryer of claim 3, wherein, The fan air outlet is an arc-shaped slot opened in the second end of the outer shell, and the arc-shaped slot corresponds to the second annular gap.

13. The hair dryer of any one of claims 1-12, wherein, The hair dryer further comprises a handle, one end of the handle being rotatably connected into a handle accommodating groove in the second end of the inner shell. The handle has a first state of being accommodated in the handle accommodating groove and a second state of being rotated and opened outside the handle accommodating groove.

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