Hair drier

Abstract

The invention 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 present invention relates to the technical field related to hair processing equipment, and in particular to a hair dryer. Background Art

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

[0003] However, although the portable hair dryers currently on the market can also be folded, they are still large in size after folding and cannot truly be portable. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a hair dryer to solve the technical problem in the prior art that hair dryers occupy too much space and are difficult to carry.

[0005] In order to achieve the above objectives, this application provides the following technical solutions: The present application provides a hair dryer, comprising: The housing adopts a cylindrical structure, the first end of the housing forms a mounting opening, the second end of the housing forms a fan outlet, and the second end of the housing is provided with a positioning mounting cylinder that cooperates with the inner peripheral wall of the housing to form an annular mounting gap; An inner shell, wherein the inner shell adopts a cylindrical structure, a first end of the inner shell is slidably nested in the outer shell through the mounting opening, and a second end of the inner shell forms an air inlet for the fan; A heating component is sleeved on the positioning and mounting cylinder; An air supply assembly, disposed in the inner shell, for conveying air through the fan air inlet to the fan air outlet; Wherein, during the relative sliding process between the inner shell and the outer shell, the air supply assembly can move synchronously with the inner shell to extend into or withdraw from the positioning and mounting cylinder.

[0006] According to some embodiments of the present application, a first hollow structure is formed on the peripheral side wall of the positioning and mounting tube.

[0007] According to some embodiments of the present application, an inner cylinder is provided in the outer shell; Among them, the inner cylinder cooperates with the inner wall of the outer shell to form a first annular gap, and the first annular gap is used to position and nest the 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 to install the heating component.

[0008] According to some embodiments of the present application, A first annular limiting protrusion is provided on the inner side wall of the first end of the housing; A second annular limiting protrusion is disposed on the outer side wall of the first end of the inner shell, and the second annular limiting protrusion is used to cooperate with the first annular limiting protrusion to limit the position where the inner shell slides out of the outer shell.

[0009] According to some embodiments of the present application, a third annular limiting protrusion is provided on the inner side wall of the second end of the outer shell, and the third annular limiting protrusion is used to cooperate with the second annular limiting protrusion to limit the position of the inner shell sliding into the outer shell.

[0010] According to some embodiments of the present application, the heat generating component includes: Outer ring cylinder; An inner ring cylinder, wherein the inner ring cylinder is sleeved on the outer circumference of the positioning and mounting cylinder, and the inner ring cylinder and the outer ring cylinder are coaxially sleeved to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder; The heating wires are evenly arranged in the annular heat exchange gap.

[0011] According to some embodiments of the present application, a second hollow structure is opened on the peripheral side wall of the inner ring cylinder, wherein the second hollow structure corresponds to the first hollow structure.

[0012] According to some embodiments of the present application, the heat generating component includes: Outer ring cylinder; An inner ring cylinder, wherein the inner ring cylinder is sleeved on the outer circumference of the positioning and mounting cylinder, and the inner ring cylinder and the outer ring cylinder are coaxially sleeved to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder; Heating wires are evenly arranged in the annular heat exchange gap; Among them, the diameter of the inner ring tube is larger than the diameter of the positioning and mounting tube, so as to form an annular air supply channel between the inner circumferential wall of the inner ring tube and the outer circumferential wall of the positioning and mounting tube; the first end of the inner ring tube is connected to the inner side wall of the first end of the outer shell, and the first end of the inner ring tube is provided with a ventilation hole, and the ventilation hole is used to connect the annular air supply channel with the interior of the inner ring tube.

[0013] According to some embodiments of the present application, the inner side wall of the second end of the shell protrudes to form a hemispherical protrusion, and the hemispherical protrusion is used to cooperate with the ventilation hole to guide the air sent into the positioning and mounting cylinder through the air supply assembly into the annular air supply channel.

[0014] According to some embodiments of the present application, a guide fold is provided at the second end of the positioning and mounting tube, and the guide fold is used to guide the air delivered through the annular air supply channel into the annular heat exchange gap.

[0015] According to some embodiments of the present application, a fan mounting cylinder corresponding to the fan air inlet is provided on the inner side of the second end of the inner shell, and the fan mounting cylinder is used to install the air supply assembly; Wherein, the diameter of the fan installation cylinder is smaller than the diameter of the positioning installation cylinder.

[0016] According to some embodiments of the present application, the fan outlet is an arc-shaped slit opened at the second end of the housing, wherein the arc-shaped slit corresponds to the second annular gap.

[0017] According to some embodiments of the present application, the hair dryer further comprises: a handle, one end of which is rotatably connected to a handle receiving groove at the second end of the inner shell; The handle has a first state in which the handle is accommodated in the handle receiving groove, and a second state in which the handle is rotated and opened to the outside of the handle receiving groove.

[0018] In the above technical scheme, a hair dryer is provided. By improving the hair dryer shell (outer shell and inner shell) and its internal structure, the hair dryer as a whole can be telescopically adjusted. When the hair dryer is not in use, the shell can be retracted and the air supply component can be placed in the gap of the positioning mounting cylinder for fixing the heating component, thereby effectively reducing the overall size of the hair dryer. When using the hair dryer, it is only necessary to lengthen the body of the hair dryer. Compared with portable hair dryers on the market, the size is smaller and more convenient for users to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic diagram of a hair dryer according to an exemplary embodiment Figure 1 ; Figure 2 is a schematic diagram of a hair dryer according to an exemplary embodiment Figure 2 ; Figure 3 is a top view of a hair dryer according to an exemplary embodiment; Figure 4 yes Figure 3 Middle AA section view; Figure 5 is an exploded view of a hair dryer according to an exemplary embodiment; Figure 6 It is a schematic diagram showing a hair dryer having an annular air supply channel formed inside according to an exemplary embodiment.

[0021] In the figure: 10. Shell; 101. Fan outlet; 102. Positioning and mounting cylinder; 1021. Guide fold; 103. First annular limiting protrusion; 104. Third annular limiting protrusion; 105. Inner cylinder; 106. Hemispherical protrusion; 20, inner shell; 201, fan air inlet; 202, fan mounting tube; 203, second annular limiting protrusion; 204, handle receiving groove; 30. Heating component; 301. Outer ring cylinder; 302. Inner ring cylinder; 303. Heating wire; A. Annular air supply channel; 40. Air supply assembly; 50. Handle. DETAILED DESCRIPTION

[0022] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0023] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0024] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0025] In the related art, a portable hair dryer is a hair dryer with a compact and lightweight design, which is easy to carry and use. They are usually small in size and light in weight, suitable for use when traveling or going out. Although the power of a portable hair dryer may not be as strong as a large household hair dryer, it can still provide enough heat to dry the hair quickly. However, although the portable hair dryers currently on the market can also achieve the folding function, they are still large in size after folding and cannot truly achieve the portable function.

[0026] The present application provides a hair dryer, which improves the hair dryer shell (outer shell and inner shell) and its internal structure so that the hair dryer as a whole can be telescopically adjusted. When the hair dryer is not in use, the shell can be retracted and the air supply component can be placed in the gap of the positioning mounting cylinder for fixing the heating component, thereby effectively reducing the overall size of the hair dryer. When the hair dryer is used, it is only necessary to lengthen the body of the hair dryer. Compared with portable hair dryers on the market, the size is smaller and more convenient for users to carry.

[0027] The technical solution of this embodiment is described in detail below in conjunction with the accompanying drawings. The following embodiments and implementation methods can be combined with each other if there is no conflict.

[0028] In an exemplary embodiment of the present invention, a hair dryer is provided, such as Figure 1-Figure 4 As shown, the hair dryer includes: an outer shell 10, an inner shell 20, a heating component 30, an air supply component 40 and other structures.

[0029] The outer shell 10 and the inner shell 20 cooperate to form a accommodating chamber of the hair dryer, and the heating component 30 and the air supply component 40 and other structures are installed through the accommodating chamber. Among them, 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 outlet 101, and the second end of the outer shell 10 is provided with a positioning installation cylinder 102 that cooperates with the inner circumferential wall of the outer shell 10 to form an annular installation gap; the inner shell 20 adopts a cylindrical structure adapted to the outer shell 10, the first end of the inner shell 20 can be slidably nested in the outer shell 10 through the mounting port, and the second end of the inner shell 20 forms a fan inlet 201. When fixing the heating component 30, the heating component 30 can be sleeved on the outer peripheral side of the positioning installation cylinder 102. The air supply component 40 is arranged in the inner shell 20, and is used to transport air to the fan outlet 101 through the fan inlet 201. In the relative sliding process between 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 installation cylinder 102 .

[0030] In the present embodiment, since the outer shell 10 and the inner shell 20 constituting the housing of the hair dryer can slide relative to each other, the hair dryer as a whole can be telescopically adjusted. When the hair dryer is not in use, the air supply component 40 (including the motor, etc.) can be placed in the gap of the positioning mounting cylinder 102 for fixing the heating component 30 while the housing is contracted, so that the internal space can be effectively contracted, thereby effectively reducing the overall size of the hair dryer. When using the hair dryer, it is only necessary to lengthen the body of the hair dryer, and it can be used normally in this state. Compared with portable hair dryers on the market, the hair dryer is smaller in size and more convenient for users to carry.

[0031] In some exemplary embodiments, since the internal space of the hair dryer is relatively small, the positioning and mounting cylinder 102 will have a significant impact on the air supply path and flow rate regardless of whether the air supply assembly 40 is inside or outside the positioning and mounting cylinder 102. Therefore, in order to ensure the smoothness of the air supply of the air supply assembly 40, the positioning and mounting cylinder 102 may be improved. For example, Figure 4 As shown, a first hollow structure is provided on the peripheral side wall of the positioning installation tube 102. Based on the first hollow structure provided on the positioning installation tube, the wind sent out by the air supply component 40 can be delivered to the heating component 30 as soon as possible, and the cold wind delivered by the air supply component 40 absorbs the heat on the heating component 30 to obtain hot wind.

[0032] Optionally, ventilation holes are evenly arranged on the outer circumference of the positioning and mounting cylinder 102, so that the cold air delivered by the air supply component 40 can fully contact the heating component 30, so that the two can better achieve heat exchange and improve the stability of the air supply temperature. 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 the hole shapes such as round holes, square holes, diamond holes and triangular holes.

[0033] In some exemplary embodiments, Figure 4 As shown, an inner cylinder 106 is provided in the outer shell 10. Specifically, the inner cylinder 106 cooperates with the inner side wall of the outer shell 10 to form a first annular gap, which is used to locate the first end of the nested inner shell 20; the inner cylinder 106 cooperates with the positioning and mounting cylinder 102 to form a second annular gap, which is used to install the heating component 30.

[0034] In this embodiment, based on the arrangement of the inner cylinder 106 on the inner side of the outer shell 10, the outer shell 10 and the inner cylinder 106 cooperate to obtain a double-layer structure with a first annular gap. The double-layer structure is nested with the first end of the inner shell 20 as a telescopic structure, that is, the first end of the inner shell 20 is nested in the first annular gap and can achieve sliding telescoping.

[0035] In some exemplary embodiments, considering that the inner shell 20 and the outer shell 10 may 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 to prevent the inner shell 20 from completely sliding out of the outer shell 10 after the hair dryer is stretched. Figure 4 As shown, a first annular limiting protrusion 103 is provided on the inner side wall of the first end of the outer shell 10; a second annular limiting protrusion 203 is provided on the outer side wall of the first end of the inner shell 20, and the second annular limiting protrusion 203 is used to cooperate with the first annular limiting protrusion 103 to limit the position where the inner shell 20 slides out of the outer shell 10. Specifically, an annular groove is provided on the first annular limiting protrusion 103, and when the inner shell 20 is stretched, the second annular limiting protrusion 203 is clamped by the annular groove, so that the first end of the inner shell 20 is limited to the first end of the outer shell 10, so that the two do not slide relative to each other.

[0036] Further optionally, considering that the hair dryer inner shell 20 and the outer shell 10 may not be able to maintain the contracted state, affecting the user experience, other limiting protrusions may be added to limit the first end of the inner shell 20 in the first annular gap at a position close to the second end of the outer shell 10. Exemplarily, the inner side wall of the second end of the outer shell 10 is provided with a third annular limiting protrusion 104, which is used to cooperate with the second annular limiting protrusion 203 to limit the position of the inner shell 20 sliding into the outer shell 10.

[0037] In some exemplary embodiments, since both the inner shell 20 and the outer shell 10 are cylindrical structures, and a positioning and mounting cylinder 102 is provided inside the outer shell 10 to accommodate the air supply assembly 40 when the hair dryer is retracted, the inner cavity formed by the inner shell 20 and the outer shell 10 is an annular inner cavity. Based on this, the heating assembly 30 can also be designed as an annular structure. For example, Figure 5 As shown, the heating component 30 includes: an outer ring cylinder 301, an inner ring cylinder 302 and a heating wire 303. The inner ring cylinder 302 is sleeved on the outer peripheral side of the positioning and mounting cylinder 102, and the inner ring cylinder 302 and the outer ring cylinder 301 are sleeved coaxially to form an annular heat exchange gap between the inner ring cylinder 302 and the outer ring cylinder 301; the heating wire 303 is evenly arranged in the annular heat exchange gap.

[0038] In some exemplary embodiments, in order to realize the installation and fixation of the air supply assembly 40, a corresponding installation portion can be provided in the inner shell 20 to fix it. For example, the installation portion can be designed as a cylindrical structure fixed to the inner side of the second end of the inner shell 20. Specifically, a fan installation cylinder 202 corresponding to the fan air inlet 201 is provided on the inner side of the second end of the inner shell 20, and the fan installation cylinder 202 is used to install the air supply assembly 40. Among them, 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.

[0039] The first end of the inner ring tube 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 mounting tube 202 faces the inside of the positioning mounting tube 102, in order to improve the heat exchange effect and ensure the smoothness of the air supply of the air supply component 40, a hollow structure can also be provided on the inner ring tube 302. Exemplarily, the peripheral side wall of the inner ring tube 302 is provided with a second hollow structure, wherein the second hollow structure corresponds to the first hollow structure. Since the hollow structure is provided on both the inner ring tube 302 and the fan mounting tube 102, the hot air can flow out quickly, and the temperature of the inner ring tube 302 and the outer ring tube 301 in the heat generating component can also be quickly reduced, so as to avoid the residual high temperature inside the hair dryer housing, and reduce or avoid the situation that it affects the service life of the motor and other components in the air supply component 40.

[0040] Furthermore, the outer ring tube 301 can be kept at a certain distance from the inner tube 106 inside the outer shell 10 to prevent the outer ring tube 301 from directly conducting heat to the inner tube 106, thereby causing the outer shell 10 to overheat and affect the user experience. It should be noted that the inner tube 106 can also be made of a material with a certain heat insulation effect and a poor heat conduction.

[0041] In another alternative, if Figure 6 As shown, the first hollow structure is not provided on the peripheral side wall of the positioning and mounting cylinder 102, and the diameter of the inner ring cylinder 302 is designed to be larger than the diameter of the positioning and mounting 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 and mounting 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 the first end of the inner ring cylinder 302 is provided with a ventilation hole, which is used to connect the annular air supply channel A with the inside of the inner ring cylinder 302.

[0042] Based on the existence of the annular air supply channel A, direct heat conduction between the positioning and mounting cylinder 102 and the inner ring cylinder 302 can also be avoided, thereby preventing the positioning and mounting cylinder 102 from retaining high temperature after the inner shell 20 and the outer shell 10 are shrunk, thereby preventing the service life of components such as the motor in the air supply assembly 40 from being affected.

[0043] In this embodiment, the positioning and mounting cylinder 102, the inner ring cylinder 302 and the outer ring cylinder 301 in the heating component 30 are not provided with a hollow structure, the center of the second end of the outer shell 10 is recessed, and a hemispherical protrusion 106 is formed on the inner side of the second end of the outer shell 10, so as to guide the air sent into the positioning and mounting cylinder 102 through the air supply component 40 and guide it out 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 from the fan air inlet 201 at the first end of the inner shell 20, and then passes through the air supply component 40 and enters the positioning and mounting cylinder 102 (at this time, the positioning and mounting cylinder 102 and the air supply component 40 have been separated); then reaches the hemispherical protrusion 106 and is divided, and enters the annular air supply channel A; then enters the annular heat exchange gap formed between the inner ring cylinder 302 and the outer ring cylinder 301 to exchange heat with the heating wire 303, and the heated air is finally blown out from the fan air outlet 101 of the outer shell 10.

[0044] Further optionally, if Figure 6 As shown, a guide fold 1021 can also be set at the second end of the positioning and mounting tube 102 (i.e., the end close to the fan air inlet 201), and the air delivered through the annular air supply channel A is guided into the annular heat exchange gap through the guide fold 1021, thereby increasing the air supply smoothness of the air supply assembly 40.

[0045] In some exemplary embodiments, Figure 1 , Figure 5As shown, the fan air outlet 101 is an arc-shaped slit opened at the second end of the housing 10, wherein the arc-shaped slit corresponds to the second annular gap.

[0046] 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 shell 10 and actual needs. It can be an arc-shaped slit in the above embodiment, or it can be a circle of evenly distributed air outlet holes opened at the second end of the shell 10. The shape of the air outlet holes includes but is not limited to at least one of the hole types such as round holes, square holes and triangular holes.

[0047] In some exemplary embodiments, Figure 2 As shown, the hair dryer further includes a handle 50, one end of which is rotatably connected to the handle receiving groove 204 at the second end of the inner shell 20. The handle 50 has a first state in which it is received in the handle receiving groove 204, and a second state in which it is rotated and opened to the outside of the handle receiving groove 204.

[0048] In this embodiment, the outer shell 10 has a built-in heating component 30, and the inner shell 20 has an air supply component 40. When the outer shell 10 and the inner shell 20 are in a 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 limited at the first end of the outer shell 10; when the outer shell 10 and the inner shell 20 are in a 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 limited at a position close to the second end of the outer shell 10. The handle 50 is foldably connected to the two ends of the inner shell 20, and when the handle 50 is folded, it is accommodated in the handle accommodating groove 204 at the second end of the inner shell 20.

[0049] Based on the relative sliding fit between the outer shell 10 and the inner shell 20, the hair dryer as a whole can be telescopically adjusted. When the hair dryer is not in use, the air supply component 40 can be placed in the gap of the positioning and mounting cylinder 102 for fixing the heating component 30 while the shell is contracted, so that the internal space can be effectively contracted, and the handle 50 can be folded and stored in the handle accommodating groove 204, thereby effectively reducing the overall size of the hair dryer; when using the hair dryer, 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, it can be used normally. Compared with portable hair dryers on the market, it is smaller in size and more convenient for users to carry.

[0050] In addition, based on the handle 50 being 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 blower is not in use, the blower air inlet 201 can be blocked to prevent dust from entering.

[0051] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A hair dryer, characterized in that: The hair dryer comprises: The housing adopts a cylindrical structure, the first end of the housing forms a mounting opening, the second end of the housing forms a fan outlet, and the second end of the housing is provided with a positioning mounting cylinder that cooperates with the inner peripheral wall of the housing to form an annular mounting gap; An inner shell, wherein the inner shell adopts a cylindrical structure, a first end of the inner shell is slidably nested in the outer shell through the mounting opening, and a second end of the inner shell forms an air inlet for the fan; A heating component is sleeved on the positioning and mounting cylinder; An air supply assembly, disposed in the inner shell, for conveying air through the fan air inlet to the fan air outlet; Wherein, during the relative sliding process between the inner shell and the outer shell, the air supply assembly can move synchronously with the inner shell to extend into or withdraw from the positioning and mounting cylinder.

2. The hair dryer according to claim 1, characterized in that: The peripheral side wall of the positioning and mounting tube is provided with a first hollow structure.

3. The hair dryer according to claim 2, characterized in that: An inner cylinder is arranged in the outer 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 heating component.

4. The hair dryer according to claim 1, characterized in that: A first annular limiting protrusion is provided on the inner side wall of the first end of the housing; A second annular limiting protrusion is provided on the outer side wall of the first end of the inner shell, and the second annular limiting protrusion is used to cooperate with the first annular limiting protrusion to limit the position where the inner shell slides out of the outer shell.

5. The hair dryer according to claim 4, characterized in that: A third annular limiting protrusion is provided on the inner side wall of the second end of the outer shell, and the third annular limiting protrusion is used to cooperate with the second annular limiting protrusion to limit the position where the inner shell slides into the outer shell.

6. The hair dryer according to claim 3, characterized in that: The heating component comprises: Outer ring cylinder; An inner ring cylinder, wherein the inner ring cylinder is sleeved on the outer circumference of the positioning and mounting cylinder, and the inner ring cylinder and the outer ring cylinder are coaxially sleeved to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder; The heating wires are evenly arranged in the annular heat exchange gap.

7. The hair dryer according to claim 6, characterized in that: A second hollow structure is formed on the peripheral side wall of the inner ring tube, wherein the second hollow structure corresponds to the first hollow structure.

8. The hair dryer according to claim 1, characterized in that: The heating component comprises: Outer ring cylinder; An inner ring cylinder, wherein the inner ring cylinder is sleeved on the outer circumference of the positioning and mounting cylinder, and the inner ring cylinder and the outer ring cylinder are coaxially sleeved to form an annular heat exchange gap between the inner ring cylinder and the outer ring cylinder; Heating wires are evenly arranged in the annular heat exchange gap; Among them, the diameter of the inner ring tube is larger than the diameter of the positioning and mounting tube, so as to form an annular air supply channel between the inner circumferential wall of the inner ring tube and the outer circumferential wall of the positioning and mounting tube; the first end of the inner ring tube is connected to the inner side wall of the first end of the outer shell, and the first end of the inner ring tube is provided with a ventilation hole, and the ventilation hole is used to connect the annular air supply channel with the interior of the inner ring tube.

9. The hair dryer according to claim 8, characterized in that: The inner side wall of the second end of the shell protrudes to form a hemispherical protrusion, and the hemispherical protrusion is used to cooperate with the ventilation hole to guide the air sent into the positioning installation cylinder through the air supply component to the annular air supply channel.

10. The hair dryer according to claim 9, characterized in that: A guide fold is provided at the second end of the positioning and mounting tube, and the guide fold is used to guide the air sent out through the annular air supply channel into the annular heat exchange gap.

11. The hair dryer according to claim 1, characterized in that: A fan installation cylinder corresponding to the fan air inlet is provided on the inner side of the second end of the inner shell, and the fan installation cylinder is used to install the air supply assembly; Wherein, the diameter of the fan installation cylinder is smaller than the diameter of the positioning installation cylinder.

12. The hair dryer according to claim 3, characterized in that: The fan air outlet is an arc-shaped slit opened at the second end of the housing, wherein the arc-shaped slit corresponds to the second annular gap.

13. The hair dryer according to any one of claims 1 to 12, characterized in that: The hair dryer further comprises: a handle, one end of which is rotatably connected to a handle receiving groove at the second end of the inner shell; The handle has a first state in which the handle is accommodated in the handle receiving groove, and a second state in which the handle is rotated and opened to the outside of the handle receiving groove.

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