Air heater and blower

Abstract

The utility model discloses an air heater and a blower, the air heater comprises a ceramic heat conductor and a heating circuit, the ceramic heat conductor is provided with a plurality of vent holes, the plurality of vent holes are arranged at intervals, and the two ends of the vent holes are communicated in the thickness direction of the ceramic heat conductor; the heating circuit is integrally formed in the ceramic heat conduction part and distributed in the hole walls of the multiple ventilation holes, and the heating circuit is provided with at least two wiring ends. According to the technical scheme, the heat exchange effect of the blower can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of household appliances, especially to an air heater and a hair dryer. BACKGROUND

[0002] At present, most hair dryers adopt heating wire frames, and the heating wire frames have large volume, high space occupancy and low heating efficiency and temperature control precision. Therefore, with the increasing requirements of fast temperature rise, precise temperature control and safety of high-speed hair dryers, the traditional heating wire frames gradually cannot meet the application requirements. The ceramic heating plate (MCH) has high thermal efficiency and can quickly rise in temperature, and the ceramic material has good insulation and high safety guarantee. However, the ceramic heating plate is mostly in the form of a sheet and is usually used in a straightening iron. When used in a hair dryer, the heat exchange area is small, the heat exchange effect is poor, and it is difficult to meet the use requirements of the hair dryer. SUMMARY

[0003] The main purpose of the utility model is to provide an air heater, which aims to improve the heat exchange effect when used in a hair dryer.

[0004] To achieve the above purpose, the air heater provided by the utility model comprises:

[0005] a ceramic heat conductor having a plurality of ventilation holes, the plurality of ventilation holes are arranged at intervals and both ends of the ventilation holes in the thickness direction of the ceramic heat conductor are through.

[0006] a heating circuit integrally formed in the ceramic heat conductor and distributed in the hole walls of the plurality of ventilation holes, the heating circuit has at least two wiring ends.

[0007] Optionally, the number of the heating circuits is plural, and the plurality of heating circuits are distributed at intervals in the thickness direction of the ceramic heat conductor.

[0008] Optionally, the outer circumferential surface of the ceramic heat conductor is provided with a plurality of wiring grooves, the plurality of wiring grooves are distributed at intervals in the circumferential direction of the ceramic heat conductor, the wiring grooves at least penetrate one end of the ceramic heat conductor in the thickness direction, and each of the wiring ends is located in the wiring groove.

[0009] Optionally, the two wiring ends of any heating circuit are arranged at intervals in the two wiring grooves.

[0010] Optionally, the wiring ends of the plurality of heating circuits are located outside the ceramic heat conductor, and the wiring ends of the respective heating circuits are arranged at intervals.

[0011] Optionally, the plurality of heating lines comprises a first heating line and a second heating line, the first heating line has a greater resistance than the second heating line, the first heating line is used for connecting a 220V voltage circuit, and the second heating line is used for connecting a 110V voltage circuit.

[0012] Optionally, the heating line is composed of two terminals and a heating line part extending from one terminal to the other terminal.

[0013] Optionally, the hole wall of each ventilation hole passes through the heating line.

[0014] Optionally, the ceramic heat conductor comprises a main body part and an outer ring part arranged outside the main body part, the ventilation hole is arranged in the main body part, and a material reducing hole is arranged between the outer ring part and the main body part.

[0015] Optionally, the hole wall of each ventilation hole passes through the heating line.

[0016] Optionally, the ventilation hole is a regular hexagonal hole, a circular hole or a square hole.

[0017] Optionally, the ceramic heat conductor comprises a spiral main body and a plurality of connecting parts, the plurality of connecting parts are connected between the inner and outer circles of the spiral main body and are distributed at intervals along the extension direction of the spiral main body, the ventilation hole is located between two adjacent connecting parts, and the heating line is arranged in the spiral main body.

[0018] Optionally, the spiral main body is in the shape of an Archimedes spiral, the heating line comprises a connecting part and two heating segments connected to the connecting part, the connecting part is located at the center position of the spiral main body, the two heating segments are spaced apart and each extend outward from the connecting part along the spiral main body, and the terminals of the two heating segments are located at the outer end of the spiral main body.

[0019] Optionally, the spiral main body is in the shape of a Fermat spiral, and the heating line extends from one end of the spiral main body to the other end.

[0020] Optionally, the air heater further comprises two heat sinks, the ceramic heat conductor is arranged between the two heat sinks, and the heat sink is provided with a heat dissipation air hole corresponding to each ventilation hole.

[0021] The utility model also provides a hair dryer, including casing, electric control device and air heater as above, the casing is equipped with air inlet, air outlet and the air duct connected between air inlet and air outlet, the air heater is located in the air duct, the electric control device is located in the casing, and is connected with the air heater electricity.

[0022] The beneficial effects of this invention are as follows: By setting multiple ventilation holes on the ceramic heat conductor and distributing the heating circuit integrally formed within the ceramic heat conductor in the walls of the ventilation holes, when current is applied to the heating circuit and heat is generated, heat can be conducted to the outer surface of the ceramic heat conductor and the inner walls of the multiple ventilation holes. Thus, when air flows through the ceramic heat conductor, it can be heated within the multiple ventilation holes, effectively increasing the heat exchange area of ​​the ceramic heat conductor and improving the heat exchange efficiency of the air heater. Compared to sheet-shaped ceramic heating plates, it improves the heat exchange effect when used in hair dryers, meeting the needs of hair dryer usage. Moreover, compared to traditional heating coils, the air heater of this invention has a simple structure and is easy to assemble, which helps to simplify the structure of hair dryers. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the air heater of this utility model;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the ceramic heat conductor;

[0026] Figure 3 for Figure 2 Front view of the ceramic heat conductor;

[0027] Figure 4 for Figure 3 Sectional view at point AA;

[0028] Figure 5 for Figure 3 Sectional view at point BB;

[0029] Figure 6 for Figure 3 Sectional view at CC;

[0030] Figure 7 This is a schematic diagram of another embodiment of the air heater of this utility model.

[0031] Figure 8 for Figure 7 Schematic diagram of the structure of the ceramic heat conductor;

[0032] Figure 9 for Figure 8 Cross-sectional view of one of the heating circuits in the ceramic heat conductor;

[0033] Figure 10 Structure diagram of another embodiment of the air heater of the present application;

[0034] Figure 11 Structure diagram of the ceramic heat conductor Figure 10 Structure diagram of the ceramic heat conductor

[0035] Figure 12 Structure diagram of the ceramic heat conductor Figure 11 Structure diagram of the ceramic heat conductor

[0036] Explanation of reference numerals:

[0037] 10, ceramic heat conductor; 11, air vent; 12, wiring slot; 13, main body; 14, outer ring; 15, material reducing hole; 16, spiral main body; 17, connecting part; 20, heating circuit; 21, wiring end; 22, heating line part; 23, connecting section; 24, heating section; 30, heat sink; 31, heat dissipation air hole.

[0038] The realization, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0042] The utility model provides a kind of air heater for hair dryer.

[0043] In the embodiments of the present application, please refer to Figures 1 to 6 (also can refer to Figures 7 to 9 Or refer to Figures 10 to 12 ), the air heater includes ceramic heat conductor 10 and heating circuit 20, ceramic heat conductor 10 has multiple ventilation holes 11, multiple ventilation holes 11 are arranged at intervals, and are all arranged in both ends through in the thickness direction of ceramic heat conductor 10;Heating circuit 20 is integrally formed in ceramic heat conduction, and is distributed in the hole wall of multiple ventilation holes 11, and heating circuit 20 has at least two wiring ends 21.

[0044] Specifically, at least part of the wiring end 21 is located outside the ceramic heat conductor 10, and the wiring end 21 is used for wiring, the heating circuit 20 can be formed by printing metal heating resistance paste, the ceramic heat conductor 10 and the heating circuit 20 are integrally formed by co-sintering process, the ceramic heat conductor 10 is an insulator or its resistance is much larger than the resistance of the heating circuit 20 (for example, ≥10 3The air heater of the utility model can guarantee the normal current flow through the heating circuit 20 and prevent bypass current, and the resistance of the ceramic heat conductor 10 is not limited in the utility model. In the forming process, the ceramic green body with the ventilation hole 11 is initially formed, the high-melting-point metal heating resistance paste such as tungsten or molybdenum manganese is printed on the hole wall area of the ventilation hole 11 of the ceramic green body according to the preset shape, the paste is spaced from the inner wall surface of the ventilation hole 11, the laminated heat pressing is used to realize the interlayer combination of the porous ceramic and the heating circuit, and the high-temperature co-sintering forms the ceramic heat conductor 10 containing the heating circuit 20. The wiring end 21 is used for connecting the power supply circuit, so that when the current is input to the heating circuit 20, the heating circuit 20 converts the electric energy into the heat energy, meanwhile, the heat generated by the heating circuit 20 can be conducted to the outer surface of the ceramic heat conductor 10 and the inner wall surface of the ventilation hole 11, and when the airflow passes through the ceramic heat conductor 10, the heat exchange can be realized, and the airflow heating is realized.

[0045] The utility model technical scheme sets the plurality of ventilation holes 11 on the ceramic heat conductor 10, and distributes the heating circuit 20 integrally formed in the ceramic heat conductor in the hole wall of the plurality of ventilation holes 11, when the heating circuit 20 is heated by inputting the current, the heat can be conducted to the outer surface of the ceramic heat conductor 10 and the inner wall surface of the plurality of ventilation holes 11, so that when the air flows through the ceramic heat conductor 10, the air can be heated in the plurality of ventilation holes 11, the heat exchange area of the ceramic heat conductor 10 is effectively increased, the heat exchange efficiency of the air heater can be improved, compared with the sheet-shaped ceramic heating plate, the heat exchange effect when used for the hair dryer can be improved, and the use demand of the hair dryer is satisfied.

[0046] In some embodiments, the number of the heating circuit 20 is multiple, and the plurality of heating circuits 20 are distributed along the thickness direction of the ceramic heat conductor 10. Specifically, the number of the heating circuit 20 is at least two, and specifically can be two, three, four, five or six and the like. By setting the plurality of heating circuits 20, the heating efficiency can be improved, and different line combinations can realize multiple heating modes. The resistance of the plurality of heating circuits 20 can be the same or different.

[0047] Optionally, the connection terminals 21 of the plurality of heating lines 20 are all located outside the ceramic heat conductor 10, and the connection terminals 21 are led out from the side of the ceramic heat conductor 10 to connect to an external power supply, and the connection terminals 21 of the respective heating lines 20 are spaced apart from each other, so as to facilitate flexible connection according to actual needs during assembly, for example, the plurality of heating lines 20 can be connected in series, or the plurality of heating lines 20 can be connected in parallel, or the plurality of heating lines 20 can be connected in a combination of series and parallel, which can provide more expansion possibilities for subsequent circuit design and heating mode, and the design flexibility is high. Of course, in other embodiments, at least two connection terminals 21 of the heating lines 20 can be connected to each other when printing the resistance paste, and the connection terminals 21 of the two heating lines 20 connected to each other are hidden in the ceramic heat conductor 10 during sintering, and the remaining connection terminals 21 are located outside the ceramic heat conductor 10.

[0048] When used in a hair dryer, a plurality of power supply circuits can be provided, each of which is provided with a switching circuit, and the plurality of heating lines 20 are connected one by one with the plurality of power supply circuits, so as to realize independent power supply of each heating line 20. In use, different heating modes can be realized by selecting to power some or all of the heating lines 20. The number of power supply circuits can also be less than the number of heating lines 20, and some of the heating lines 20 are connected in series or parallel to one power supply circuit (this type of circuit structure can be provided with multiple groups, and the number of heating lines 20 in each group is the same or different), and the remaining heating lines 20 are connected one by one with the remaining power supply circuits.

[0049] Further, the plurality of heating lines 20 includes a first heating line and a second heating line, the resistance of the first heating line is greater than the resistance of the second heating line, the first heating line is used to connect a 220V voltage circuit, and the second heating line is used to connect a 110V voltage circuit. In actual application, a voltage selection switch can be added to automatically switch the connection of the power supply circuit with the first heating line or the second heating line, so that the air heater can be powered by 220V mains or 110V mains, and can be used in countries with different mains voltages, and the versatility can be improved. The resistance design principles of the first heating line and the second heating line are: the resistance R1 of the first heating line is designed according to the 220V rated power (for example, R1=220 2 / P), and the resistance R2 of the second heating line is R2=1 / 4R1. Optionally, the same polarity connection terminals of the first heating line and the second heating line share a connection point, so as to reduce the number of external connections.

[0050] In some embodiments, please refer to Figures 1 to 6The outer peripheral surface of the ceramic heat conductor 10 is provided with a plurality of wire grooves 12, the plurality of wire grooves 12 are spaced apart along the circumference of the ceramic heat conductor 10, the wire groove 12 at least penetrates one end in the thickness direction of the ceramic heat conductor 10, and each wire end 21 is located in the wire groove 12. Thus, when installed in the hair dryer, the wire end 21 and the corresponding wire can be prevented from protruding to the outer peripheral surface of the ceramic heat conductor 10, thereby avoiding interference between the wire end 21 and the corresponding wire and other structures during installation, ensuring reliable wiring of the wire end 21. Of course, in other embodiments, the wire end 21 can also be provided on the outer peripheral surface or end surface of the ceramic heat conductor 10.

[0051] Optionally, the two wire ends 21 of any heating wire 20 are arranged in two wire grooves 12, that is, the two wire ends 21 of the same heating wire 20 are not located in the same wire groove 12, so that the two wire ends 21 of the same heating wire 20 are far apart, which can increase the creepage distance and reduce the risk of short circuit during actual use, while avoiding the need to additionally provide a creepage prevention structure, which is beneficial to simplify the structure of the ceramic heat conductor 10 and facilitate molding. The distance between the two adjacent wire grooves 12 can be set according to the number and voltage of the heating wires 20.

[0052] In some embodiments, the heating wire 20 is composed of two wire ends 21 and a heating wire part 22 extending from one wire end 21 to the other wire end 21. Specifically, in the heating wire 20, the heating wire part 22 is the only conductive wire between the two wire ends 21, that is, the heating wire 20 is a single wire. Compared with the mode of providing multiple parallel wires between the two wire ends 21 of the same heating wire 20, this structure is simple, and the heating wire part 22 can be arranged such that the heating wire 20 passes through the hole wall of each ventilation hole 11, so that the heating wire part 22 is uniformly distributed on the ceramic heat conductor 10, improving the heating uniformity of the heating wire 20. Of course, in other embodiments, multiple parallel wires are provided between the two wire ends 21 of the same heating wire 20, and the lengths of the multiple wires are consistent.

[0053] In some embodiments, the hole wall of each ventilation hole 11 has a heating wire 20 (heating wire part 22) passing through it, so that the hole wall of each ventilation hole 11 can be directly heated by the heating wire 20, which can improve the heating effect and make the heating wire 20 more evenly distributed on the ceramic heat conductor 10, improving the overall heating uniformity of the ceramic heat conductor 10. Optionally, each heating wire 20 passes through the hole walls of all ventilation holes 11. Of course, in other embodiments, the heating wire 20 can not pass through the hole walls of some ventilation holes 11 (for example, when multiple heating wires 20 are provided, one of the heating wires 20 can pass through the hole walls of some ventilation holes 11, and the other heating wire 20 can pass through the hole walls of another set of ventilation holes 11).

[0054] In some embodiments, the ceramic heat conductor 10 comprises a main body part 13 and an outer ring part 14 arranged outside the main body part 13, the ventilation holes 11 are arranged on the main body part 13, and the outer ring part 14 and the main body part 13 are arranged with material reducing holes 15 therebetween; specifically, the outer ring part 14 can be used to connect with other components, so that the shape of the ceramic heat conductor 10 can be shaped according to actual needs by using the outer ring part 14, avoiding the interference of the installation structure with the ventilation holes 11, reducing the influence on the heat exchange efficiency while ensuring convenient installation. By arranging the material reducing holes 15 between the outer ring part 14 and the main body part 13, the situation that the thickness between the outer ring part 14 and the main body part 13 is too large to cause cracking and other defects during sintering can be avoided, and at the same time, the heat exchange area of the ceramic heat conductor 10 can be increased by using the material reducing holes 15 to improve the heat exchange efficiency. Optionally, at least part of the hole walls of the material reducing holes 15 have the heating wire 20 (heating wire part 22) passing through.

[0055] In some embodiments, the heating wire 20 passes through the hole walls on opposite sides of each ventilation hole 11; in this way, the uniformity of the distribution of the heating wire 20 on the ceramic heat conductor 10 can be further improved, and the overall heating uniformity of the ceramic heat conductor 10 can be improved. It can be understood that, in order to prevent the heating concentration of the hole walls between adjacent two ventilation holes 11, the size of the heating wire 20 at each position should be substantially uniform, and the same heating wire 20 should not pass through the hole walls between any adjacent two ventilation holes 11 multiple times (twice or more times), that is, each heating wire 20 only has one section passing through the hole walls between any adjacent two ventilation holes 11. Optionally, each heating wire 20 passes through the hole walls on opposite sides of all ventilation holes 11.

[0056] In some embodiments, the ventilation hole 11 is a regular hexagonal hole, that is, the parts of the ceramic heat conductor 10 where the plurality of ventilation holes 11 are arranged are arranged in a honeycomb shape, so that the thickness of the hole walls of the ventilation hole 11 is relatively uniform, which is convenient for the molding of the ceramic heat conductor 10 and can also avoid the cracking due to uneven thickness during sintering, thereby improving the molding yield of the ceramic heat conductor 10. Of course, in other embodiments, the ventilation hole 11 can also be a circular hole or a square hole, etc.

[0057] Unlike the ceramic heat conductor 10 in the honeycomb shape, in other embodiments, please refer to Figures 7 to 9 or refer to Figures 10 to 12, the ceramic heat conductor 10 comprises a spiral body 16 and a plurality of connecting portions 17, the plurality of connecting portions 17 are connected between the inner and outer rings of the spiral body 16 and are spaced apart along the extension direction of the spiral body 16, the ventilation hole 11 is located between two adjacent connecting portions 17, and the heating wire 20 is arranged in the spiral body 16. In this way, the heating wire 20 can be arranged along the spiral body 16, the wiring mode is simple, the wiring uniformity can be ensured, and production is facilitated. The connecting portion 17 is located in the spiral gap formed by the spiral body 16 and is spaced apart along the extension direction of the spiral gap, so that the structural strength of the spiral body 16 can be improved through the connecting portion 17, and the risk of deformation or fracture of the spiral body 16 is reduced.

[0058] The specific shape of the spiral body 16 has various forms. For example, in some embodiments, referring to Figures 7 to 9 , the spiral body 16 is in the form of a Fermat spiral, and the heating wire 20 extends from one end of the spiral body 16 to the other end. That is, the cross section (the section perpendicular to the thickness direction) of the spiral body 16 is substantially in the form of a Fermat spiral, so that the two wire connection ends 21 of the heating wire 20 are arranged at the two ends of the spiral body 16, the heating wire 20 extends from one end of the spiral body 16 to the other end, wiring is facilitated, and the forming difficulty of the spiral body 16 and the heating wire 20 can be reduced.

[0059] In other embodiments, referring to Figures 10 to 12 , the spiral body 16 is in the form of an Archimedes spiral, the heating wire 20 comprises a connecting segment 23 and two heating segments 24 connected to the connecting segment 23, the connecting segment 23 is located at the center position of the spiral body 16, the two heating segments 24 are spaced apart and extend outward from the connecting segment 23 along the spiral body 16, and the wire connection ends 21 of the two heating segments 24 are located at the outer ends of the spiral body 16. That is, the cross section (the section perpendicular to the thickness direction) of the spiral body 16 is substantially in the form of an Archimedes spiral, and the two heating segments 24 of the heating wire 20 extend outward from the connecting segment 23 along the spiral body 16 in parallel.

[0060] In some embodiments, referring to Figure 1 , Figure 7 or Figure 10 , the air heater further comprises two heat sinks 30, the ceramic heat conductor 10 is arranged between the two heat sinks 30, and the heat sink 30 is provided with a heat dissipation air hole 31 corresponding to each ventilation hole 11. Specifically, the heat sink 30 is formed by a metal profile with high thermal conductivity (for example, aluminum or the like), in use, the heat of the end surface of the ceramic heat conductor 10 can be conducted into the heat dissipation air hole 31 of the heat sink 30, and when the airflow flows through the heat dissipation air hole 31 of the heat sink 30, the heat exchange can be further improved, the heat exchange area of the air heater can be further improved, and the heat exchange efficiency can be improved. The radial dimension of the heat sink 30 can be greater than or equal to the radial dimension of the ceramic heat conductor 10.

[0061] The utility model discloses still a kind of hair dryer, the hair dryer includes shell, electric control device and air heater, the specific structure of the air heater refers to above-mentioned embodiment. Among them, shell is equipped with air inlet, air outlet and the air duct connected between air inlet and air outlet, air heater is located in air duct, electric control device is located in shell, and with air heater electric connection. The specific shape of hair dryer and the specific structure of electric control device can refer to prior art, the utility model does not repeat again here.

[0062] The above-mentioned is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made under the inventive concept of the utility model, using the utility model specification and the contents of drawings, or direct / indirectly applied in other related technical fields are included in the patent protection range of the utility model.

Claims

1. An air heater, characterized in that The air heater comprises: a ceramic heat conductor having a plurality of ventilation holes, the ventilation holes being spaced apart from each other and penetrating through both ends of the ceramic heat conductor in the thickness direction of the ceramic heat conductor; and a heating wire integrally formed in the ceramic heat conductor and distributed in the hole walls of the ventilation holes, the heating wire having at least two wire ends. The number of the heating wires is plural, and the heating wires are spaced apart from each other along the thickness direction of the ceramic heat conductor.

2. The air heater of claim 1, wherein The outer circumferential surface of the ceramic heat conductor is provided with a plurality of wire grooves, the wire grooves being spaced apart from each other along the circumferential direction of the ceramic heat conductor, the wire grooves penetrating through at least one end of the ceramic heat conductor in the thickness direction, and each of the wire ends being located in the wire grooves.

3. The air heater of claim 2, wherein The two wire ends of any one of the heating wires are divided and arranged in the two wire grooves. The wire ends of the plurality of heating wires are located outside the ceramic heat conductor, and the wire ends of each of the heating wires are spaced apart from each other. The plurality of heating wires comprises a first heating wire and a second heating wire, the resistance of the first heating wire being greater than that of the second heating wire, the first heating wire being used for connecting a 220V voltage circuit, and the second heating wire being used for connecting a 110V voltage circuit.

4. The air heater of claim 2, wherein The heating wire is composed of the two wire ends and a heating wire part extending from one wire end to the other wire end.

5. The air heater according to any one of claims 1 to 4, wherein The hole walls of each of the ventilation holes pass through the heating wire. The ceramic heat conductor comprises a main body and an outer ring arranged outside the main body, the ventilation holes are arranged in the main body, and a material reducing hole is arranged between the outer ring and the main body.

6. The air heater of claim 5, wherein The hole walls of each of the ventilation holes pass through the heating wire. The ventilation holes are regular hexagonal holes, circular holes or square holes. The ceramic heat conductor comprises a spiral main body and a plurality of connecting parts, the connecting parts being connected between the inner and outer circles of the spiral main body and spaced apart from each other along the extension direction of the spiral main body, the ventilation holes being located between adjacent connecting parts, and the heating wire being arranged in the spiral main body.

7. The air heater as claimed in claim 1 or 2, wherein The spiral main body is in the shape of an Archimedes spiral, the heating wire comprises a connecting part and two heating segments connected to the connecting part, the connecting part being located at the center of the spiral main body, the two heating segments being spaced apart from each other and extending outward from the connecting part along the spiral main body, and the wire ends of the two heating segments being located at the outer ends of the spiral main body.

8. The air heater of claim 7, wherein Alternatively, the spiral main body is in the shape of a Fermat spiral, and the heating wire extends from one end of the spiral main body to the other end. The air heater further comprises two heat sinks, the ceramic heat conductor being arranged between the two heat sinks, and each of the ventilation holes being provided with a heat dissipation hole on the heat sink.

9. The air heater of claim 1, wherein, The air heater comprises a shell, an electric control device and the air heater according to any one of claims 1 to 9, the shell being provided with an air inlet, an air outlet and an air duct connected between the air inlet and the air outlet, the air heater being arranged in the air duct, and the electric control device being arranged in the shell and electrically connected with the air heater.

10. A hair dryer characterized by ​

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