Hair drier with multiple heat insulation functions

Abstract

The utility model relates to the technical field of hair driers, and provides a multi-heat-insulation hair dryer which comprises a hair dryer head and a handle, the hair dryer head comprises an outer shell and an inner shell, and a heat insulation layer is arranged between the outer shell and the inner shell; the inner shell is provided with an annular containing cavity and an annular air outlet, and the annular air outlet communicates with the annular containing cavity. A heating wire frame is arranged in the annular containing cavity, and a heat insulation barrel is arranged outside the heating wire frame in a sleeving mode; a preset gap is formed between the heat insulation barrel and the cavity wall of the annular containing cavity, so that a heat insulation annular cavity is formed; a wind generating assembly is arranged in the handle and used for supplying wind to the annular containing cavity. The heat insulation layer and the heat insulation ring cavity are arranged at the same time, multi-layer heat insulation is formed in the hair dryer, the temperature of the shell around the air outlet of the hair dryer is greatly reduced, a user can be prevented from being scalded, and meanwhile the heat utilization rate is increased. In addition, the heat insulation layer and the heat insulation ring cavity are thin, the overall size of the blower is not affected, and only the installation gap of the heat insulation layer and the forming space of the heat insulation ring cavity need to be reserved.

Description

Technical Field

[0001] This application relates to the technical field of hair dryers, and particularly to a hair dryer with multiple heat insulations. Background Art

[0002] After washing hair, when people need to wash up and go to bed or go out, it takes a lot of time for the hair to dry naturally or to be dried by a low-speed hair dryer. High-speed hair dryers facilitate people's lives and shorten the time for people to dry their hair. Currently, in order to be able to blow out winds of different temperatures, high-speed hair dryers are usually composed of a group of heating wires and a small fan. If only the small fan rotates and the heating wires do not work, the high-speed hair dryer can only blow out cold air. When the heating wires and the small fan work simultaneously, the heating wire assembly generates heat, and the air blown by the fan becomes hot air after passing through the heating wires.

[0003] Currently, when the hair dryer is working in the heating state, the outer shell part around the air outlet of the hair dryer has a relatively high temperature, even up to 60 °C, which makes it easy for users to be scalded during the use of the hair dryer. Utility Model Content

[0004] To solve the above problems, this application provides a hair dryer with multiple heat insulations, which is ingeniously designed and has a simple structure. By simultaneously setting a heat insulation layer and a heat insulation ring cavity, multiple layers of heat insulation are formed in the hair dryer, greatly reducing the temperature of the outer shell around the air outlet of the hair dryer, avoiding scalding of users, and improving the heat utilization rate at the same time. In addition, the heat insulation layer and the heat insulation ring cavity are relatively thin and do not affect the overall size of the hair dryer. Only the installation gap for the heat insulation layer and the formation space for the heat insulation ring cavity need to be reserved, and there is no need to make major adjustments to the production parameters of each component in the hair dryer due to the setting of the heat insulation layer and the heat insulation ring cavity, greatly saving the cost investment required for product update and upgrade. The technical solutions adopted in this application are as follows:

[0005] A hair dryer with multiple heat insulations, comprising: a blowing head and a handle. The blowing head includes an outer shell and an inner shell, and a heat insulation layer is provided between the outer shell and the inner shell; the inner shell is provided with an annular cavity and an annular air outlet, and the annular air outlet is communicated with the annular cavity; a heating wire holder is provided in the annular cavity, and a heat insulation cylinder is sleeved outside the heating wire holder; a preset gap is provided between the heat insulation cylinder and the cavity wall of the annular cavity to form a heat insulation ring cavity; a wind generating component is provided in the handle, and the wind generating component is used to supply air to the annular cavity.

[0006] By simultaneously setting the heat insulation layer and the heat insulation annular cavity, multi-layer heat insulation is formed in the hair dryer, which greatly reduces the temperature of the outer shell around the air outlet of the hair dryer, avoiding scalding the user. At the same time, the setting of the heat insulation layer reduces the heat released from the outer shell, enabling more heat to be released from the air outlet of the hair dryer and improving the heat utilization rate. In addition, the heat insulation layer and the heat insulation annular cavity are relatively thin and will not affect the overall size of the hair dryer. Only the installation gap for the heat insulation layer and the formation space for the heat insulation annular cavity need to be reserved, without the need to make major adjustments to the production parameters of each component in the hair dryer due to the setting of the heat insulation layer and the heat insulation annular cavity, greatly saving the cost investment required for product update and upgrade.

[0007] In some embodiments, annular abutting surfaces are provided on both sides of one end of the annular cavity close to the annular air outlet, and the abutting surfaces are used to abut against the heat insulation cylinder and the heating wire holder.

[0008] By setting the annular abutting surfaces, the heat insulation cylinder and the heating wire holder can be limited. When the heat insulation cylinder and the heating wire holder abut against the annular abutting surfaces, they cannot continue to penetrate towards the direction close to the annular air outlet. At this time, it indicates that the heat insulation cylinder and the heating wire holder have been installed in place, which improves the installation efficiency of the heat insulation cylinder and the heating wire holder. At the same time, it also reduces the risk of vibration of the heat insulation cylinder and the heating wire holder affected by the air flow during the operation of the hair dryer, improves the stability of the heat insulation cylinder and the heating wire holder, and weakens the noise of the hair dryer.

[0009] In some embodiments, the heat insulation layer is a porous vacuum silicon layer.

[0010] In some embodiments, a heat dissipation layer is provided inside the heat insulation layer, and the heat dissipation layer is provided on the outer wall of the inner housing.

[0011] By setting the heat dissipation layer, the heat can be evenly dispersed on the outer shell around the air outlet of the hair dryer, so that the temperature distribution of the outer shell is relatively uniform, avoiding the occurrence of local overheating of the outer shell and further improving the user experience. By setting the heat dissipation layer inside the heat insulation layer, compared with setting the heat dissipation layer outside the heat insulation layer, the heat dissipation effect can be better, making the temperature distribution of the outer shell more uniform.

[0012] In some embodiments, the heat dissipation layer includes a non-metallic heat conduction layer.

[0013] In some embodiments, the non-metallic heat conduction layer is a graphene coating.

[0014] In some embodiments, the heat dissipation layer further includes a metal foil layer, and the metal foil layer is located inside the non-metallic heat conduction layer.

[0015] By arranging the metal foil layer on the inner side of the non-metal heat-conducting layer, that is, arranging the non-metal heat-conducting layer between the heat-insulating layer and the metal foil layer, good protection can be provided for the non-metal heat-conducting layer, avoiding damage to the non-metal heat-conducting layer, reducing the loss of the non-metal heat-conducting layer, and ensuring the heat equalizing effect of the heat equalizing layer.

[0016] In some embodiments, the metal foil layer is an aluminum foil.

[0017] In some embodiments, the heat equalizing layer is adhesively bonded to the outer wall of the inner housing.

[0018] By pasting the heat equalizing layer on the outer wall of the inner housing, the installation efficiency of the heat equalizing layer is improved, and at the same time, the connection strength between the heat equalizing layer and the outer wall of the inner housing is ensured, and the heat equalizing layer can be prevented from falling off during the assembly process of the components of the hair dryer.

[0019] In some embodiments, the adhesive is a polyacrylic acid adhesive.

[0020] The hair dryer with multiple heat insulations provided by the present application has at least one of the following beneficial effects:

[0021] 1. The hair dryer with multiple heat insulations provided by the present application forms multiple layers of heat insulation in the hair dryer by arranging the heat-insulating layer and the heat-insulating ring cavity at the same time, greatly reducing the temperature of the outer shell around the air outlet of the hair dryer, avoiding scalding the user. At the same time, the arrangement of the heat-insulating layer reduces the heat released from the outer shell, enabling more heat to be released from the air outlet of the hair dryer, improving the heat utilization rate. In addition, the heat-insulating layer and the heat-insulating ring cavity are relatively thin and will not affect the overall size of the hair dryer. Only the installation gap of the heat-insulating layer and the formation space of the heat-insulating ring cavity need to be reserved, and there is no need to make major adjustments to the production parameters of the components in the hair dryer due to the arrangement of the heat-insulating layer and the heat-insulating ring cavity, greatly saving the cost investment required for product update and upgrade.

[0022] 2. The hair dryer with multiple heat insulations provided by the present application can limit the heat-insulating cylinder and the heating wire holder by arranging an annular abutting surface. When the heat-insulating cylinder and the heating wire holder abut against the annular abutting surface, they cannot continue to penetrate towards the direction close to the annular air outlet. At this time, it indicates that the heat-insulating cylinder and the heating wire holder have been installed in place, which improves the installation efficiency of the heat-insulating cylinder and the heating wire holder. At the same time, it also reduces the risk of vibration of the heat-insulating cylinder and the heating wire holder affected by the air flow during the operation of the hair dryer, improves the stability of the heat-insulating cylinder and the heating wire holder, and weakens the noise of the hair dryer.

[0023] 3. The hair dryer with multiple heat insulations provided by this application can evenly disperse heat on the outer shell around the air outlet of the hair dryer by setting a heat equalizing layer, so that the temperature distribution on the outer shell is relatively uniform, avoiding the situation of too high local temperature on the outer shell and further improving the user experience. By setting the heat equalizing layer inside the heat insulation layer, compared with setting the heat equalizing layer outside the heat insulation layer, the heat equalizing effect can be better and the temperature distribution on the outer shell can be more uniform.

[0024] 4. For the hair dryer with multiple heat insulations provided by this application, by setting the metal foil layer inside the non-metal heat conducting layer, that is, setting the non-metal heat conducting layer between the heat insulation layer and the metal foil layer, it can form good protection for the non-metal heat conducting layer, avoid damage to the non-metal heat conducting layer, reduce the loss of the non-metal heat conducting layer, and ensure the heat equalizing effect of the heat equalizing layer.

[0025] 5. For the hair dryer with multiple heat insulations provided by this application, by pasting the heat equalizing layer on the outer wall of the inner shell, the installation efficiency of the heat equalizing layer is improved, and at the same time, the connection strength between the heat equalizing layer and the outer wall of the inner shell is ensured, and the heat equalizing layer can be prevented from falling off during the assembly process of each component of the hair dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above characteristics, technical features, advantages and their implementation manners of a hair dryer with multiple heat insulations will be further described below in a clear and understandable manner in combination with the drawings of the preferred embodiments:

[0027] Figure 1 It is a schematic cross-sectional view of the blowing part in the hair dryer of this application;

[0028] Figure 2 It is an exploded view of the hair dryer of this application;

[0029] Figure 3 It is Figure 2 A schematic view of the heat insulation layer arranged outside the inner shell in the embodiment;

[0030] Figure 4 It is Figure 2 A combined state diagram of the embodiment;

[0031] Figure 5 It is Figure 4 A schematic cross-sectional view of the blowing part in the embodiment;

[0032] Figure 6 It is a schematic view of the inner shell and its inner components of this application;

[0033] Figure 7 It is Figure 6 The state after the embodiment is disassembled;

[0034] Figure 8 It is Figure 6Exploded view of the embodiment;

[0035] Figure 9 It is a schematic diagram of the inner housing of this application.

[0036] Explanation of the reference numerals in the drawings:

[0037] Blowing head 1, handle 2, inner housing 3, outer housing 4, heat insulation layer 5, annular cavity 6, annular air outlet 7, heating wire holder 8, heat insulation cylinder 9, heat insulation ring cavity 10, abutting surface 11. Detailed implementation manners

[0038] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will describe the specific implementation manners of this application with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0039] To make the drawings concise, only the parts related to this application are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, parts with the same structure or function are only schematically shown as one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0040] It should also be further understood that the term "and / or" used in the description of this application and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0041] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0042] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0043] Refer to Figures 1 - 8, this application provides a hair dryer with multiple heat insulation functions, including: a blowing head 1 and a handle 2. The blowing head 1 includes an outer housing 4 and an inner housing 3, and a heat insulation layer 5 is provided between the outer housing 4 and the inner housing 3; the inner housing 3 is provided with an annular cavity 6 and an annular air outlet 7, and the annular air outlet 7 is communicated with the annular cavity 6; a heating wire holder 8 is arranged in the annular cavity 6, and a heat insulation cylinder 9 is sleeved outside the heating wire holder 8; a preset gap is provided between the heat insulation cylinder 9 and the cavity wall of the annular cavity 6 to form a heat insulation annular cavity 10; a wind generating component is arranged in the handle 2, and the wind generating component is used to supply air to the annular cavity 6. It should be noted that the setting position of the heat insulation layer 5 mainly corresponds to the part of the hair dryer (when the heat insulation layer 5 is not provided) with a higher outer shell temperature. In addition, the probability of contact between the outer shell and the user can also be taken into consideration. That is to say, it is best to set the heat insulation layer 5 at the part of the hair dryer with a higher outer shell temperature and a greater probability of contact with the user. It can be understood that the heating wire holder 8 includes a heating support frame and a heating wire wound around the heating support frame. Refer to Figures 5 - 8 , the heating wire holder 8, the annular cavity 6 and the annular air outlet 7 are all annular and the three are coaxially arranged. The air flow is heated by passing through the heating wire holder 8 and then blown out from the annular air outlet 7. The heating wire holder 8 and the wind generating component are both prior arts and will not be elaborated here one by one. The heat insulation cylinder 9 can be a mica cylinder, or a cylindrical structure made of heat-resistant ceramics, such as zirconia ceramics, or a cylindrical structure made of glass fiber, such as high-silica glass fiber, or a cylindrical structure made of other materials.

[0044] It is worth noting that in order to improve the heat insulation effect of the hair dryer while minimizing the adjustments and changes made to the existing hair dryer production line, that is to say, the settings of the heat insulation layer 5 and the heat insulation annular cavity 10 will not have a great impact on the production parameters of the existing components of the hair dryer, and the parameter adjustments of the components of the hair dryer are small. This requires that both the thickness of the heat insulation layer 5 and the thickness of the heat insulation annular cavity 10 be thin, the overall weight of the heat insulation layer 5 be light, and the heat insulation layer 5 be easy to install. In order to install the heat insulation layer 5, the thickness of the outer shell in the existing hair dryer can be reduced to provide an installation space for the heat insulation layer 5, or the size of the outer housing 4 can be slightly increased, or the size of the inner housing 3 can be slightly reduced, as long as there is an installation gap for the heat insulation layer 5 between the outer housing 4 and the inner housing 3. There are also various implementation methods for the heat insulation annular cavity 10. For example, it can be achieved by slightly reducing the sizes of the heating wire holder 8 and the heat insulation cylinder 9, or by slightly reducing the wall thickness of the inner housing 3.

[0045] The heat insulation layer 5 can be a porous vacuum silicon layer or a silicon-based aerogel layer. The porous vacuum silicon layer is a new heat insulation material in the form of cross-linked sheets composed of polymer aggregates and nano-porous vacuum silica. The pore diameter of the nano-porous vacuum silica is 10 - 40 nm, which is smaller than the average free path of air molecules (68 nm). It has a porosity of over 97%, and its density can be as low as below 0.03 g / ml, achieving a quasi-vacuum effect. Therefore, there is no intermolecular collision inside the pores, thus realizing ultra-high heat insulation performance. The porous vacuum silicon layer is a flexible sheet insulation material with a thickness that can be made to 0.5 - 4 mm. It has a porous structure with a uniform surface, a thermal conductivity that can be as low as 0.014 W / (m·K), and a thermal resistance as low as 0.353 (m²·K) / W. Its operating temperature ranges from -40 to 200 °C. For the embodiment shown in Figures 1 - 5 When the porous vacuum silicon layer and the heat insulation ring cavity 10 are not provided, the temperature of the outer shell around the air outlet of the hair dryer is as high as 60 °C. However, after setting a 1.5-mm-thick porous vacuum silicon layer, the temperature of the outer shell around the air outlet of the hair dryer drops to about 30 °C, and the heat insulation effect is very significant. It can be understood that if a better heat insulation effect is desired, the thickness of the heat insulation layer 5 can be increased.

[0046] The silicon-based aerogel layer is a nano-porous polymer material with a three-dimensional continuous network formed by interconnected silica particles (1 - 5 nm) as the framework and gas expanding throughout its volume. It has a high porosity (85 - 99.8%) and extremely small pores (not greater than 20 nm). On the one hand, this special nano-pore network structure significantly reduces the gas-solid heat conduction efficiency of the silicon-based aerogel layer, making the thermal conductivity of the silicon-based aerogel layer significantly low, at 0.01 - 0.03 W / (m·K).

[0047] It should be noted that by simultaneously setting the heat insulation layer 5 and the heat insulation ring cavity 10, multi-layer heat insulation is formed in the hair dryer, greatly reducing the temperature of the outer shell around the air outlet of the hair dryer, which can prevent users from being scalded. At the same time, the setting of the heat insulation layer 5 reduces the heat released from the outer shell, enabling more heat to be released from the air outlet of the hair dryer, improving the heat utilization rate. In addition, the heat insulation layer 5 and the heat insulation ring cavity 10 are relatively thin and do not affect the overall size of the hair dryer. Only the installation gap for the heat insulation layer 5 and the formation space for the heat insulation ring cavity 10 need to be reserved, without the need to make major adjustments to the production parameters of each component in the hair dryer due to the setting of the heat insulation layer 5 and the heat insulation ring cavity 10, greatly saving the cost investment required for product renewal and upgrading.

[0048] Refer to Figure 1 、 Figure 8 、 Figure 9, in one embodiment, annular abutting surfaces 11 are provided on both sides of one end of the annular cavity 6 close to the annular air outlet 7. The abutting surfaces 11 can abut against the heat insulation cylinder 9 and the heating wire holder 8. By providing the annular abutting surfaces 11, the heat insulation cylinder 9 and the heating wire holder 8 can be limited. When the heat insulation cylinder 9 and the heating wire holder 8 abut against the annular abutting surfaces 11, they cannot continue to penetrate deeper in the direction close to the annular air outlet 7. At this time, it indicates that the heat insulation cylinder 9 and the heating wire holder 8 have been installed in place. This improves the installation efficiency of the heat insulation cylinder 9 and the heating wire holder 8, and at the same time reduces the risk of vibration of the heat insulation cylinder 9 and the heating wire holder 8 caused by the influence of air flow during the operation of the hair dryer, improves the stability of the heat insulation cylinder 9 and the heating wire holder 8, and weakens the noise of the hair dryer.

[0049] It can be understood that when installing the heat insulation layer 5, it can be directly wrapped around the outer wall of the inner housing 3, and the installation of the heat insulation layer 5 can be completed after connecting the seams of the heat insulation layer 5, or the heat insulation layer 5 can be pasted on the outer wall of the inner housing 3 by using an adhesive. Preferably, the adhesive is directly compounded with the heat insulation layer 5 to form an adhesive layer on one side of the heat insulation layer 5, and a protective film is provided outside the adhesive layer. When the heat insulation layer 5 needs to be installed, the protective film can be directly torn off for pasting, which greatly improves the installation efficiency of the heat insulation layer 5 and at the same time ensures the connection strength between the heat insulation layer 5 and the outer wall of the inner housing 3. The adhesive can be polyacrylic acid glue, polyurethane glue, or inorganic high-temperature glue. Polyacrylic acid glue with a relatively low price is preferred, and polyacrylic acid glue can be used at a temperature of 150-160 °C.

[0050] In one embodiment, a heat dissipation layer (or heat conduction layer) may also be provided between the outer housing 4 and the inner housing 3. The heat dissipation layer may be provided outside the heat insulation layer 5 or inside the heat insulation layer 5. By providing the heat dissipation layer, heat can be evenly dispersed on the outer housing around the air outlet of the hair dryer, so that the temperature distribution on the outer housing is relatively uniform, avoiding the occurrence of too high local temperature on the outer housing and further improving the user experience. It should be noted that it is preferable to provide the heat dissipation layer inside the heat insulation layer 5, that is, to provide the heat dissipation layer between the heat insulation layer 5 and the inner housing 3. By providing the heat dissipation layer inside the heat insulation layer 5, compared with providing the heat dissipation layer outside the heat insulation layer 5, the heat dissipation effect can be better and the temperature distribution on the outer housing can be more uniform. It can be understood that the heat insulation layer 5 and the heat dissipation layer can be provided independently of each other, that is, the two are not bonded but only in close contact with each other. In another case, the heat insulation layer 5 and the heat dissipation layer are combined together, and the two are combined through an adhesive to form a composite layer. The type of the adhesive can refer to the foregoing embodiments. The heat dissipation layer can also be combined with the heat insulation layer 5 as a coating. It is easy to understand that when the heat dissipation layer is provided inside the heat insulation layer 5, the connection method between the heat dissipation layer and the outer wall of the inner housing 3 can refer to the connection method between the heat insulation layer 5 and the outer wall of the inner housing 3 when the heat insulation layer 5 is provided alone. That is to say, the heat dissipation layer can merely wrap around the outer wall of the inner housing 3 without being bonded to it, or can be bonded to the outer wall of the inner housing 3 through an adhesive.

[0051] Specifically, the heat dissipation layer can merely be a metal foil layer, such as an aluminum foil, a copper foil or a tin foil, or can merely be a non-metal heat conduction layer, such as a graphene coating, a graphene film, a fullerene coating or a fullerene film, or can also be a natural graphite film, an artificial graphite heat dissipation film or a nano-carbon heat dissipation film. It should be noted that the heat dissipation layer can also be a composite layer of a metal foil layer and a non-metal heat conduction layer. In one embodiment, the heat insulation layer 5, the non-metal heat conduction layer and the metal foil layer are combined together in sequence, which can greatly improve the installation efficiency of the heat insulation layer 5 and the heat dissipation layer. In addition, the non-metal heat conduction layer is provided between the heat insulation layer 5 and the metal foil layer, which can form a good protection for the non-metal heat conduction layer, avoid damage to the non-metal heat conduction layer, reduce the loss of the non-metal heat conduction layer and ensure the heat dissipation effect (heat conduction effect) of the heat dissipation layer. In this application, the metal foil layer is preferably an aluminum foil with a relatively low price, and the non-metal heat conduction layer is preferably a graphene coating. The thickness of the aluminum foil can be 15μm, 30μm or 250μm, and the thickness of the graphene coating can be 13μm. It can be understood that the specific types and thicknesses of the above aluminum foil and graphene coating are only some selections that can meet the heat insulation requirements of the hair dryer. In other embodiments, other types and thicknesses of heat dissipation materials can be selected according to specific heat insulation requirements.

[0052] It should be noted that the above embodiments can be freely combined as needed. The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A hair dryer with multiple heat insulation, characterized in that: include: A hair dryer head and a handle, the hair dryer head comprises an outer shell and an inner shell, an insulating layer is provided between the outer shell and the inner shell; the inner shell is provided with an annular cavity and an annular air outlet, the annular air outlet is communicated with the annular cavity; a heating wire rack is provided in the annular cavity, an insulating tube is provided outside the heating wire rack; a preset gap is provided between the insulating tube and the cavity wall of the annular cavity to form an insulating annular cavity; a wind-generating component is provided in the handle, and the wind-generating component is used to supply air to the annular cavity.

2. A hair dryer with multiple thermal insulation according to claim 1, characterized in that: Annular abutting surfaces are provided on both sides of one end of the annular cavity close to the annular air outlet, and the abutting surfaces are used to abut the heat insulation tube and the heating wire rack.

3. A hair dryer with multiple thermal insulation according to claim 2, characterized in that: The heat insulation layer is a porous vacuum silicon layer.

4. A hair dryer with multiple thermal insulation according to claim 3, characterized in that: A heat equalizing layer is arranged inside the heat insulating layer, and the heat equalizing layer is arranged on the outer wall of the inner shell.

5. A hair dryer with multiple thermal insulation according to claim 4, characterized in that: The heat-dissipating layer includes a non-metallic heat-conducting layer.

6. A hair dryer with multiple thermal insulation according to claim 5, characterized in that: The non-metallic heat-conducting layer is a graphene coating.

7. A hair dryer with multiple thermal insulation according to claim 5, characterized in that: The heat-dissipating layer further includes a metal foil layer, and the metal foil layer is located on the inner side of the non-metallic heat-conducting layer.

8. A hair dryer with multiple thermal insulation according to claim 7, characterized in that: The metal foil layer is aluminum foil.

9. A hair dryer with multiple thermal insulation according to any one of claims 4 to 8, characterized in that: The heat-dissipating layer is bonded to the outer wall of the inner shell by an adhesive.

10. A hair dryer with multiple thermal insulation according to claim 9, characterized in that: The adhesive is polyacrylic acid glue.

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