Ceramic heating body with good insulating property

Abstract

The utility model discloses a ceramic heating element with good insulating property, which comprises an upper ceramic layer, a lower ceramic layer and a tungsten slurry heating circuit arranged on the opposite side surfaces of the upper ceramic layer and the lower ceramic layer, and the upper ceramic layer is provided with two electrode holes which are respectively arranged at the two ends of the tungsten slurry heating circuit. The high-temperature-resistant ceramic capacitor is characterized in that a protective shell is arranged at the right end of the upper ceramic layer and the right end of the lower ceramic layer, the electrode holes are located in the inner side of the protective shell, an isolation block is arranged in the protective shell, a filling layer located in the protective shell is arranged on the right side of the isolation block, and the right side of the filling layer is provided with an electrode plate and a power-on wire connected with the electrode plate. The electrified wire sequentially penetrates through the isolation block, the filling layer and the protective shell and extends to the right side of the protective shell; the utility model has the advantage of good electrical insulativity.

Description

Technical Field

[0001] This utility model belongs to the field of ceramic heating element technology, and relates to a ceramic heating element with good insulation. Background Technology

[0002] With the increasing demands of society for energy conservation, environmental protection and efficient thermal energy utilization, water heating systems are widely used in homes, office buildings, commercial centers and other places. In traditional water heating systems, the heating element mainly uses metal heating pipes or traditional ceramic heating elements.

[0003] Chinese utility model patent with authorization announcement number CN204598339U discloses a sheet-like ceramic heating element, including a ceramic substrate. Heating lines and electrode leads are disposed on the surface of the ceramic substrate. The heating lines are printed on the surface of the ceramic substrate, and an insulating layer is disposed on the surface of the heating lines. The ceramic substrate has a sheet-like structure. In this technical solution, the heating element does not protect the electrode holes, which may pose a risk of leakage and short circuit during use. Utility Model Content

[0004] To address the aforementioned problems, this invention proposes a ceramic heating element with good insulation, which effectively solves the problems in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A ceramic heating element with good insulation includes an upper ceramic layer, a lower ceramic layer, and a tungsten paste heating circuit disposed on opposite sides of the upper and lower ceramic layers. Two electrode holes are formed on the upper ceramic layer, which are the two ends of the tungsten paste heating circuit. Electrode plates and conductive wires connected to the electrode plates are disposed in the electrode holes. A protective shell is disposed at the right end of the upper and lower ceramic layers. The electrode holes are located inside the protective shell. An insulating block is disposed inside the protective shell. A filling layer is disposed to the right of the insulating block and located inside the protective shell. The conductive wire passes through the insulating block, the filling layer, and the protective shell in sequence and extends to the right side of the protective shell.

[0006] Furthermore, the filling layer is made of polyurethane foam.

[0007] Furthermore, the inner side of the protective shell is provided with a heat insulation layer that contacts the sides of the upper and lower ceramic plates, and the material of the heat insulation layer is alumina aerogel.

[0008] Furthermore, the energized conductor includes a nickel wire conductor and a Teflon sleeve covering the outer side of the nickel wire conductor, and the nickel wire conductor is connected to the electrode plate.

[0009] Furthermore, the insulating block is provided with a high-temperature resistant sealing gasket that contacts the Teflon sleeve.

[0010] Furthermore, both the upper ceramic layer and the outer surface of the lower ceramic layer are provided with a silicon nitride coating.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This invention achieves multi-level isolation of the electrode holes through a protective shell, an insulating block, and a filling layer, preventing the electrode holes from contacting the outside world and ensuring the electrical insulation of the ceramic heating element. The heat insulation layer provides heat insulation protection between the protective layer and the upper and lower ceramic layers, extending the service life of the protective shell. The silicon nitride coating provides further protection for the upper and lower ceramic layers, improving the electrical insulation of the ceramic heating element while ensuring its heating efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This utility model Figure 1 A schematic diagram of the structure of part AA;

[0015] Figure 3 This is a front view of the present utility model.

[0016] In the diagram: 1. Upper ceramic layer; 101. Electrode hole; 2. Lower ceramic layer; 3. Tungsten paste heating circuit; 4. Silicon nitride coating; 5. Electrode sheet; 6. Nickel wire conductor; 7. Teflon sleeve; 8. Protective shell; 9. Sealing gasket; 10. Heat insulation layer; 11. Insulation block; 12. Filler layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1-3As shown, a ceramic heating element with good insulation includes an upper ceramic layer 1, a lower ceramic layer 2, and a tungsten paste heating circuit 3 printed on opposite sides of the upper ceramic layer 1 and the lower ceramic layer 2. Two electrode holes 101 are formed on the upper ceramic layer 1, which are the two ends of the tungsten paste heating circuit 3, respectively. An electrode plate 5 and a current-carrying wire connected to the electrode plate 5 are disposed in the electrode hole 101. A protective shell 8 is bonded to the right end of the upper ceramic layer 1 and the lower ceramic layer 2 by a high-temperature ceramic adhesive. The electrode holes 101 are located inside the protective shell 8. An insulating block 11 is integrally formed inside the protective shell 8. A filling layer 12 is disposed on the right side of the insulating block 11 and located inside the protective shell 8. The current-carrying wire passes through the insulating block 11, the filling layer 12 and the protective shell 8 in sequence and extends to the right side of the protective shell 8.

[0019] In use, the operator places the ceramic layer 1 and the lower ceramic layer 2 on opposite sides of the printed paper of the tungsten paste heating circuit 3, and clamps the electrode 5 between the upper ceramic layer 1 and the lower ceramic layer 2. Then, the upper ceramic layer and the lower ceramic layer 2 are fixedly connected together by high-temperature sintering. After sintering, the operator welds the conductive wire to the electrode 5 and fixes it with adhesive. Then, the conductive wire is passed through the protective shell 8, and the protective shell 8 is bonded to the upper ceramic layer 1 and the lower ceramic layer 2 with high-temperature ceramic adhesive, so that the protective shell 8 seals the electrode hole 101, preventing the electrode hole 101 from being directly exposed to the outside world, and preventing the electrode 5 and the conductive wire inside the electrode hole 101 from coming into contact with the outside world, thus preventing short circuit and leakage. This improves the insulation of the ceramic heating element. At the same time, the insulating block 11 and the filling layer 12 achieve multiple isolation between the electrode hole 101 and the outside world, reducing the risk of external water flowing through the gap between the conductive wire and the shell and coming into contact with the electrode 5, further ensuring the safety of the ceramic heating element.

[0020] In this embodiment, the material of the filling layer 12 is polyurethane foam. When in use, polyurethane foam not only has good heat insulation properties, but also has certain moisture-proof properties. It can effectively prevent moisture penetration in a sealed environment, thus ensuring the moisture-proof effect of the protective shell 8.

[0021] In this embodiment, a heat insulation layer 10 is provided on the inner side of the protective shell 8, which contacts the sides of the upper ceramic sheet and the lower ceramic sheet. The material of the heat insulation layer 10 is alumina aerogel. Alumina aerogel has extremely low thermal conductivity and is suitable for thermal insulation in high-temperature environments. At the same time, alumina aerogel has good high-temperature resistance and can maintain structural stability at high temperatures. It is not easy to melt or decompose. It can be used as the heat insulation layer 10 material between the protective shell 8 and the upper ceramic layer 1 and the lower ceramic layer 2, thereby extending the service life of the protective shell 8.

[0022] In this embodiment, the power-conducting wire includes a nickel wire 6 and a Teflon sleeve 7 covering the outer side of the nickel wire 6. The nickel wire 6 is connected to the electrode plate. In use, the Teflon sleeve 7 can provide protection for the nickel wire 6, prevent the nickel wire 6 from directly contacting the outside world, prevent the nickel wire 6 from leaking electricity, and improve the reliability of the power-conducting wire in use.

[0023] In this embodiment, a high-temperature resistant sealing gasket 9 is provided inside the insulating block 11, which contacts the Teflon sleeve 7. During use, the high-temperature resistant sealing gasket 9 further improves the sealing effect of the protective shell 8 on the electrode hole 101, and further ensures the electrical insulation of the ceramic heating element.

[0024] In this embodiment, both the outer surfaces of the upper ceramic layer 1 and the lower ceramic layer 2 are coated with a silicon nitride coating 4. Silicon nitride is a ceramic material with excellent thermal conductivity and electrical insulation. It can be coated onto the surface of the substrate by spraying or sputtering, which can improve the electrical insulation of the ceramic heating element while ensuring its heating efficiency.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ceramic heating element with good insulation, comprising an upper ceramic layer, a lower ceramic layer, and a tungsten paste heating circuit disposed on opposite sides of the upper and lower ceramic layers, wherein two electrode holes are formed on the upper ceramic layer, which are the two ends of the tungsten paste heating circuit, and electrode plates and conductive wires connected to the electrode plates are disposed in the electrode holes, characterized in that: A protective shell is provided at the right end of the upper ceramic layer and the lower ceramic layer. The electrode hole is located inside the protective shell. An isolation block is provided inside the protective shell. A filling layer is provided on the right side of the isolation block inside the protective shell. The current-carrying wire passes through the isolation block, the filling layer and the protective shell in sequence and extends to the right side of the protective shell.

2. The ceramic heating element with good insulation according to claim 1, characterized in that: The filling layer is made of polyurethane foam.

3. The ceramic heating element with good insulation according to claim 1, characterized in that: The inner side of the protective shell is provided with a heat insulation layer that contacts the sides of the upper and lower ceramic plates. The material of the heat insulation layer is alumina aerogel.

4. The ceramic heating element with good insulation according to claim 1, characterized in that: The energized conductor includes a nickel wire conductor and a Teflon sleeve covering the outer side of the nickel wire conductor. The nickel wire conductor is connected to the electrode plate.

5. A ceramic heating element with good insulation according to claim 4, characterized in that: The insulating block is equipped with a high-temperature resistant sealing gasket that contacts the Teflon sleeve.

6. The ceramic heating element with good insulation according to claim 1, characterized in that: Both the upper ceramic layer and the outer surface of the lower ceramic layer are coated with silicon nitride.

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