Electric heating film ceramic heating body suitable for air heater

Abstract

The utility model relates to an electrothermal film ceramic heating body suitable for a hot-air blower, comprising a ceramic base body, the ceramic base body is a cylindrical structure, at least one circle of heat dissipation holes are arranged around an inner hole in the ceramic base body, and electrothermal film layers are sprayed on the inner surface, the outer surface and the inner hole of the ceramic base body. The two sides of the ceramic base body are respectively provided with a circle of insulation isolation groove, and the electrothermal film layer on the ceramic base body is divided into a front heating body structure and a rear heating body structure through the two circles of insulation isolation grooves. According to the utility model, the ceramic material is optimized, so that the power is increased; the heat dissipation structure of the heating body is optimized, and the heat dissipation efficiency is improved; by optimizing the design of an insulating groove isolation circuit, the electrothermal film layer is uniform in distribution and stable in power, the service life is prolonged, and the dual-purpose electric heating device is suitable for 110V and 220V.

Description

Technical Field

[0001] This utility model relates to the field of heating device technology, and in particular to an electric heating film ceramic heating element suitable for hot air blowers. Background Technology

[0002] Among existing heating elements, traditional resistance wire heating elements suffer from problems such as low heating efficiency, easy oxidation, short lifespan, and high electromagnetic radiation. While some emerging heating elements, such as certain ceramic heating elements, have certain advantages in high-temperature resistance, they still have shortcomings in material selection, structural design, and circuit design. Especially in some applications with high requirements for heating element performance, such as hair dryers, hand dryers, space heaters, and industrial heating devices, existing heating elements have poor heat dissipation efficiency, low power, poor practicality, difficult processing, and power attenuation, making it difficult to meet the requirements of efficient, stable, and safe heating. Therefore, developing a new type of electric heating film ceramic heating element suitable for hot air blowers is of significant practical importance. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an electric heating film ceramic heating element suitable for hot air blowers, so as to solve the problems mentioned in the background art, such as small heat dissipation area, poor heat dissipation efficiency, serious power attenuation, difficulty in manufacturing sheet resistance, and inability to simultaneously apply 220V and 110V voltages.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to provide an electric heating film ceramic heating element suitable for hot air blowers, including a ceramic substrate, the ceramic substrate having a cylindrical structure, the ceramic substrate having at least one ring of heat dissipation holes arranged around the inner hole, the inner surface, outer surface and inner hole of the ceramic substrate being coated with an electric heating film layer, and an insulating isolation groove being arranged on each side of the ceramic substrate, the electric heating film layer on the ceramic substrate being separated by the two rings of insulating isolation grooves to form a front and rear heating element structure.

[0005] As a supplement to the technical solution described in this utility model, the ceramic matrix is ​​made of silicon carbide ceramic material with high thermal conductivity. The thermal conductivity of silicon carbide ceramic material is about 10 times higher than that of ordinary alumina, mullite and other ceramics.

[0006] As a supplement to the technical solution described in this utility model, the electrothermal film layer is selected as a tin oxide electrothermal film layer.

[0007] As a supplement to the technical solution described in this utility model, each heating element structure is provided with an electrode, which is electrically connected to the corresponding electrothermal film layer.

[0008] As a supplement to the technical solution described in this utility model, each heating element structure has an electrode connection hole at its top. The electrode is a ceramic screw or a metal screw, and the ceramic screw or metal screw is threadedly connected to the electrode connection hole.

[0009] As a supplement to the technical solution described in this utility model, the outer side wall of the ceramic substrate is provided with a plurality of external support ribs arranged around the circumference.

[0010] As a supplement to the technical solution described in this utility model, multiple internal support ribs are arranged around the circumference at the inner hole of the ceramic substrate.

[0011] Beneficial effects: This utility model relates to an electric heating film ceramic heating element suitable for hot air blowers, which has the following advantages:

[0012] 1. Small size and high power: Silicon carbide is used as the ceramic substrate, replacing ceramic materials such as alumina and mullite. Silicon carbide has a thermal conductivity that is about 10 times higher, which makes high-power design possible in a small size. In the same size, the power is 5-10 times higher than that of ordinary ceramics, and it can truly enter the actual application of home appliances.

[0013] 2. Large heating area and fast heat dissipation: The single-row or multi-row annular hole structure provides a large heat dissipation area and fast heat dissipation; the external and internal support ribs enhance the structural strength of the ceramic matrix, preventing deformation and cracking. Moreover, the external and internal support ribs allow ventilation and heat dissipation on the inner and outer surfaces of the ceramic matrix, preventing heat accumulation; the hollow structure of the ceramic matrix facilitates the installation and placement of temperature control elements.

[0014] 3. Easy to manufacture and stable power: The original design without the insulation groove resulted in excessively high sheet resistance and a thin heating film layer when used at 220V, making it difficult to manufacture and causing the power to decay easily. The insulation groove design reduces the sheet resistance by 4 times, greatly reducing the manufacturing difficulty of the heating film and making the power of the heating film layer stable, thus truly entering the practical stage.

[0015] 4. Dual-use design for 110V and 220V, adaptable to various voltages at home and abroad: The design of the insulating isolation groove in the middle of the electric heating film layer allows for dual-use, and it can be conveniently used with both 110V and 220V sockets. Attached Figure Description

[0016] Figure 1 This is a top view of the present invention;

[0017] Figure 2 This is the left view of this utility model.

[0018] Illustration: 1. Ceramic substrate, 2. Insulating groove, 3. Heat dissipation hole, 4. Electrode connection hole, 5. Outer support rib, 6. Inner support rib, 7. Heating element structure. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0020] The embodiments of this utility model relate to an electric heating film ceramic heating element suitable for hot air blowers, such as... Figure 1-2 As shown, the device includes a ceramic substrate 1, which has a cylindrical structure. The hollow structure of the ceramic substrate 1 (i.e., the inner hole) facilitates the installation and placement of temperature control elements. At least one ring of heat dissipation holes 3 is arranged around the inner hole inside the ceramic substrate 1. The single ring of heat dissipation holes 3 has a single-row annular hole structure, while multiple rings of heat dissipation holes 3 have a multi-row annular hole structure. The multi-hole design provides a large heat dissipation area and rapid heat dissipation. An electrothermal film layer is sprayed onto the inner surface, outer surface, and inner hole of the ceramic substrate 1 and then cured at high temperature. An insulating groove 2 is provided on each side of the ceramic substrate 1. The electrothermal film layer on the ceramic substrate 1 is separated by two rings of insulating isolation grooves 2 to form two front and rear heating element structures 7, so as to achieve zone control and uniform heating. Each heating element structure 7 is provided with an electrode, which is electrically connected to the corresponding electrothermal film layer. The two heating element structures 7 are connected in series or in parallel. This utility model has a dual-use design of 110V and 220V. By designing different electrical connections externally, the two heating element structures 7 can be connected in parallel for 110V or in series for 220V, so as to achieve multiple uses in one machine.

[0021] Each insulating groove 2 actually consists of four parts: a vertical groove 1 at the inner hole of the ceramic substrate 1, a vertical groove 2 on the outer wall of the ceramic substrate 1, a transverse groove 1 at the upper end of the ceramic substrate 1, and a transverse groove 2 at the lower end of the ceramic substrate 1. The upper end of the vertical groove 1 and the upper end of the vertical groove 2 are connected by the transverse groove 1, and the lower end of the vertical groove 1 and the lower end of the vertical groove 2 are connected by the transverse groove 2.

[0022] Without the original design of the insulation groove 2, the sheet resistance was too high when using 220V, the heating film layer was too thin and difficult to manufacture, and the power was easily attenuated. With the insulation groove design, the sheet resistance was reduced by 4 times, which greatly reduced the manufacturing difficulty of the heating film and made the power of the heating film layer stable, thus truly entering the practical stage.

[0023] The 110V and 220V dual-use design is suitable for various voltage applications both domestically and internationally. The design of the middle insulating groove 2 of the electric heating film layer allows for dual-use functionality, and it can be conveniently used with both 110V and 220V sockets.

[0024] This invention optimizes the ceramic material to increase power; optimizes the heat dissipation structure of the heating element to improve heat dissipation efficiency; and optimizes the isolation circuit design of the insulating isolation groove 2 to make the electric heating film layer uniformly distributed, the power stable, and the service life extended. It can also be used for both 110V and 220V.

[0025] The ceramic substrate 1 is made of silicon carbide ceramic material with high thermal conductivity. The thermal conductivity of silicon carbide ceramic material is about 10 times higher than that of ordinary alumina, mullite and other ceramics, which significantly improves high thermal efficiency and thermal stability. It makes high power design possible in a small volume. In the same volume, the power of silicon carbide ceramic is 5-10 times higher than that of ordinary ceramic, and it can be truly applied to home appliances.

[0026] The aforementioned electrothermal film layer is made of tin oxide, which has high conductivity, high temperature resistance and oxidation resistance, ensuring that the heating element structure 7 can work stably in a high-temperature environment.

[0027] Each heating element structure 7 has an electrode connection hole 4 on its top. The electrode is a ceramic screw or a metal screw. The ceramic screw or metal screw is threaded into the electrode connection hole 4 to ensure a firm connection and facilitate installation and maintenance.

[0028] Multiple outer support ribs 5 and inner support ribs 6 are arranged around the circumference of the outer wall and inner hole of the ceramic substrate 1, respectively. The structure of the outer support ribs 5 and inner support ribs 6 enhances the structural strength of the ceramic substrate 1, prevents deformation and cracking, and enables ventilation and heat dissipation on the inner and outer surfaces of the ceramic substrate 1, preventing heat accumulation.

[0029] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0032] The above provides a detailed description of an electric heating film ceramic heating element suitable for hot air blowers. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A ceramic heating element for a hot air blower, comprising a ceramic substrate (1), characterized in that: The ceramic substrate (1) has a cylindrical structure. At least one ring of heat dissipation holes (3) is provided around the inner hole of the ceramic substrate (1). The inner surface, outer surface and inner hole of the ceramic substrate (1) are coated with an electrothermal film layer. An insulating isolation groove (2) is provided on each side of the ceramic substrate (1). The electrothermal film layer on the ceramic substrate (1) is separated by the two insulating isolation grooves (2) to form two heating element structures (7) in front and behind.

2. The electric heating film ceramic heating element suitable for hot air blowers according to claim 1, characterized in that: The ceramic matrix (1) is made of silicon carbide ceramic material.

3. The electric heating film ceramic heating element suitable for a hot air blower according to claim 1, characterized in that: The aforementioned electrothermal film layer is selected from tin oxide electrothermal film layers.

4. The electric heating film ceramic heating element suitable for hot air blowers according to claim 1, characterized in that: Each heating element structure (7) is provided with an electrode, which is electrically connected to the corresponding electrothermal film layer.

5. The electric heating film ceramic heating element suitable for a hot air blower according to claim 4, characterized in that: Each heating element structure (7) has an electrode connection hole (4) on its top. The electrode is a ceramic screw or a metal screw, and the ceramic screw or metal screw is threaded into the electrode connection hole (4).

6. The electric heating film ceramic heating element suitable for hot air blowers according to claim 1, characterized in that: The outer side wall of the ceramic substrate (1) is provided with multiple external support ribs (5) arranged around the circumference.

7. The electric heating film ceramic heating element suitable for a hot air blower according to claim 1, characterized in that: The ceramic substrate (1) has multiple internal support ribs (6) arranged around the circumference at the inner hole.

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