Ceramic high-temperature heat generating body

Abstract

This utility model discloses a ceramic high-temperature heating element, including a support layer comprising a body and a head connected to one end of the body; separate, non-communicating functional layers are separately arranged on the left and right sides of the body, and a functional layer is also arranged on the head, forming a heating circuit extending from one side of the body to the head and then to the other side of the body; the body and / or the head is a rotating structure; the head is spherical, with the bottom surface of the spherical cap connected to one end of the body; the body and the head are an integral structure. The advantages are: the ingenious layout design ensures uniform resistance distribution, forming a heating circuit extending from one side of the body to the head and then to the other side of the body, significantly extending the heating cross-sectional area and length without changing the overall diameter and total length, resulting in uniform and stable heat distribution, precise and controllable heating power, and adaptability to various application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of electric heating element technology, specifically a ceramic high-temperature heating element. Background Technology

[0002] CN2192115Y describes a novel electric heater, which consists of a metal casing, a heat dissipation mesh, a conductive chemical heating coating, ceramic heating tubes, and a heating tube support. The inner wall of the ceramic heating tubes is coated with a conductive chemical heating coating, and copper rings with terminals are embedded in the inner walls at both ends, connecting multiple ceramic heating tubes in series to form an electric heating circuit. The heating tube support consists of two slotted tubes joined together to form a column. Symmetrical semi-circular grooves are located on the edges of the slots, and the two semi-circular grooves join together to form a circular hole with a diameter matching the outer diameter of the ceramic heating tube. The bottom edge of the slotted column has equidistant locking bolt holes for fastening with locking bolts.

[0003] This solution features a large heat dissipation area, high thermal efficiency, and safety and reliability. However, because the heating layer of the ceramic tube is located on the inner wall of the ceramic tube, it suffers from difficulties in processing, uneven heating of the heating layer, and uneven heating of the ceramic tube body, which can easily lead to cracking and short service life.

[0004] To address this, CN210120669U discloses a planar ceramic heating element for electronic cigarettes, comprising a first insulating layer and a second insulating layer. A heating resistor and an internal electrode are printed side-by-side between the inner surfaces of the first and second insulating layers. A first protective layer is superimposed on the outer surface of the first insulating layer, and a second protective layer is superimposed on the outer surface of the second insulating layer. Lead-out electrodes are printed on the outer surface of the second protective layer. Through holes are formed at corresponding positions of the second insulating layer and the second protective layer, and the through holes are filled with a connecting conductor. The internal electrode and the lead-out electrode are connected through the connecting conductor. Further, the first and second insulating layers are alumina cast sheets, and the first and second protective layers are zirconia cast sheets. Further, the heating resistor, internal electrode, lead-out electrode, and connecting conductor are all formed by coating with a conductive paste primarily composed of tungsten or platinum.

[0005] Its symmetrical design attempts to achieve uniform heat distribution. However, due to structural limitations, current tends to concentrate at the corners, resulting in higher corner temperatures and lower center temperatures, causing stress concentration and cracks (due to uneven stress during thermal expansion / contraction). This affects service life and range, thus making it less adaptable. Utility Model Content

[0006] The purpose of this invention is to provide a ceramic high-temperature heating element with uniform and stable heat distribution that can be adapted to various application scenarios.

[0007] To achieve the above objectives, the basic solution of this utility model provides a ceramic high-temperature heating element, including a support layer, the support layer including a body and a head connected to one end of the body; functional layers that are not interconnected are separately arranged on the left and right sides of the body, and a functional layer is also arranged on the head, forming a heating circuit extending from one side of the body to the head and then to the other side of the body.

[0008] The beneficial effects of this basic solution are as follows: by using a clever layout design to make the resistance distribution uniform, a heating circuit is formed that extends from one side of the body to the head and then to the other side of the body. Without changing the overall diameter and total length, the heating cross-sectional area and length are greatly extended, making the heat distribution uniform and stable, enabling precise and controllable heating power, and adapting to a variety of application scenarios.

[0009] Preferably, the body and / or head is a rotating structure.

[0010] Preferably, the head is spherical, with the bottom surface of the spherical crown connected to one end of the body.

[0011] Preferably, the body and the head are an integral structure.

[0012] Preferably, the functional layer of the body includes a heating layer and a conductive layer, and the functional layer of the head includes a heating layer, together forming a heating element structure.

[0013] Preferably, the heating element structure is covered with a second outer insulating layer. This ensures that other functional layers are protected from oxidizing atmospheres (or other harmful atmospheres) by the second outer insulating layer, effectively delaying high-temperature oxidative aging of the functional layer materials, improving product lifespan, and making it suitable for various working scenarios involving frequent long-term use, high replacement and maintenance costs, and stringent reliability requirements.

[0014] Preferably, the conductive layer extends from the waist of the heating element structure to the end opposite the head. The resistance and heat generation can be effectively adjusted by changing the position and area of ​​the conductive layer, making it suitable for everything from low-power household appliances (such as curling irons and yogurt makers) to medium- and high-power industrial heating equipment (such as drying tunnels and constant temperature chambers).

[0015] Preferably, the cross-section of the main body section of the heating element structure is shaped like a football field running track. That is, the left and right sides are oppositely arranged arcs, and the front and rear sides are straight lines enclosing the cross-section. Through the arc transition design, the current flows evenly, reducing current concentration points at the source, and ultimately achieving a smaller temperature difference throughout the heating area, uniform and stable heating, and precise and controllable heating power, which is especially suitable for scenarios with high requirements for temperature uniformity. In addition, the running track-shaped arc structure can disperse the stress generated by thermal cycling, reducing failures such as cracks and fractures. Its cycle life is usually longer than that of rectangular heating elements of the same material, making it more suitable for high-frequency start-stop scenarios and with a wider range of applications.

[0016] Preferably, an electrode mounting area is provided on the end of the heating element structure facing away from the head.

[0017] Preferably, the heating element has a sheet-like structure.

[0018] This utility model has the following beneficial effects: 1. By utilizing a reasonable layout design to ensure uniform resistance distribution, a heating circuit is formed that extends from one side of the body to the head and then to the other side of the body. Without changing the overall diameter and total length, the heating cross-sectional area and length are significantly extended, resulting in uniform and stable heat distribution. When applied to igniters, this ensures high ignition reliability.

[0019] 2. Due to its unique and ingenious structural design, it heats up evenly and stably, and the heating power is precisely controllable. It is not prone to stress concentration damage, has a long lifespan, and is suitable for a variety of application scenarios and requirements.

[0020] 3. The resistance and heat generation can be effectively adjusted by adjusting the position and area of ​​the conductive layer. It can be adapted to a wide range of applications, from small household appliances to medium and large industrial heating equipment. Attached Figure Description

[0021] Figure 1 This is a partial structural diagram of Embodiment 1 of the present invention. Figure 1 .

[0022] Figure 2 for Figure 1 Sectional view of the BB plane.

[0023] Figure 3 for Figure 1 Sectional view of the C-plane.

[0024] Figure 4 This is a partial structural diagram of Embodiment 1 of the present invention. Figure 2 .

[0025] Figure 5 for Figure 4 Sectional view of the DD plane.

[0026] Figure 6 for Figure 4 Sectional view of the EE plane.

[0027] Figure 7 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model.

[0028] Figure 8 for Figure 7 Sectional view of the FF plane.

[0029] Figure 9 for Figure 7 Sectional view of the GG plane.

[0030] Among them, in the above Figure 1-9 In the diagram, the dashed lines represent the center lines.

[0031] Figure 1-3 It involves a support layer, an inner insulating layer, a heating layer, and a conductive layer.

[0032] Figure 4-6 It involves a support layer, an inner insulating layer, a heating layer, a conductive layer, and a first outer insulating layer.

[0033] Figure 7-9 It involves a support layer, an inner insulating layer, a heating layer, a conductive layer, a first outer insulating layer, and a second outer insulating layer (the visual boundary between the first and second outer insulating layers is not obvious in the figure, so the first outer insulating layer is not marked separately). Detailed Implementation

[0034] The "rotational structure" involved in this utility model refers to a three-dimensional geometric structure formed by rotating a straight line, curve, or other object around a fixed axis.

[0035] The "football field track shape" involved in this utility model refers to a cross section formed by two opposing arcs on the left and right sides and straight lines on the front and back sides.

[0036] Currently, in the field of ceramic heating elements, H-shaped all-ceramic heating elements with a central groove and square-shaped ceramic heating elements are widely used. Among them, the H-shaped central slotted structure leads to stress concentration. The thickness of the ceramic material at the central slot is drastically reduced, and the temperature difference between the "slotted area" and the "main body area" is large during heating. The difference in thermal expansion coefficients causes local stress concentration, which can easily lead to cracking at the edge of the slot or even fracture of the main body after long-term hot and cold cycles. The risk is even higher in low-temperature start-up or rapid heating scenarios.

[0037] In contrast, block-shaped ceramic heating elements typically have a compact structure with a small contact area between the electrodes and the ceramic substrate. The heating elements (such as embedded heating wires) are mostly distributed inside the block, and heat must penetrate the entire thickness of the ceramic to reach the surface. This results in a long heat conduction path, significant heat loss, and a relatively slow heating rate. If the heating elements are not evenly distributed, a phenomenon of "one side hot and one side cold" can easily occur, especially with large-sized block-shaped heating elements where the uniformity problem is more pronounced.

[0038] Therefore, this utility model provides a specific embodiment of a ceramic high-temperature heating element that provides uniform and stable heat distribution and can be adapted to various application scenarios.

[0039] The reference numerals in the accompanying drawings include: 1-support layer, 2-inner insulating layer, 3-heating layer, 4-conductive layer, 5-first outer insulating layer, 6-second outer insulating layer, L-left side, and R-right side.

[0040] In the accompanying drawings and the following embodiments, the body of the support layer 1 and the head simultaneously possess the same type of functional layer, which are interconnected and not clearly distinguishable at the boundary, so the same reference numerals are used.

[0041] The ceramic high-temperature heating element provided in this embodiment includes a support layer 1, which includes a body and a head connected to one end of the body. Functional layers that are not interconnected are separately provided on the left and right sides of the body, and a functional layer is also provided on the head, forming a heating circuit that extends from one side of the body to the head and then to the other side of the body.

[0042] Better yet, the body and / or head are rotating structures.

[0043] Even better, the head is spherical, with the bottom surface of the spherical crown connected to one end of the body. Alternatively, the head can also be a convex, arc-shaped structure.

[0044] Even better, the body and head are integrated into one structure.

[0045] Even better, the functional layer of the main body includes a heating layer 3 and a conductive layer 4, and the functional layer of the head includes a heating layer 3, together forming a heating element structure.

[0046] Even better, the heating element structure is covered with a second outer insulating layer 6.

[0047] Even better, the conductive layer 4 extends from the waist of the heating element structure to the end opposite to the head, and the ends of the conductive layer 4 on the left and right sides of the heating element structure are not connected.

[0048] Even better, the cross-section of the main body segment of the heating element structure is shaped like a football field track.

[0049] Even better, an electrode mounting area is provided on the end of the heating element structure that is away from the head.

[0050] Even better, the heating element has a sheet-like structure.

[0051] Each functional layer consists of two main materials: insulation and conductivity. The ratio of insulation to conductivity is adjusted according to the functional requirements of each layer. Insulation materials can be, for example, silicon nitride, silicon carbide, aluminum oxide, aluminum nitride, or other ceramic materials; conductivity materials can be, for example, disilicide, silicon carbide, tungsten carbide, titanium nitride, zirconium nitride, titanium boride, tungsten, or other conductive materials.

[0052] In addition, prior applications such as CN110590371A, MX2024002132A, and CN100484337C also provide a number of parameters and materials that can achieve the functional layer of this utility model, which will not be elaborated here.

[0053] The following detailed description illustrates the specific implementation method: Example 1 is basically as shown in the appendix. Figure 1-9 As shown: The ceramic high-temperature heating element provided in this embodiment is composed of a support layer 1; the support layer 1 is composed of a body and a head connected to one end of the body. The head is preferably spherical, the bottom surface of the spherical crown is connected to the end of the body, and the body is also a rotating body and is an integral structure with the head.

[0054] On each of the left and right sides of the main body, as well as on the head, an inner insulating layer 2, a heating layer 3, and a first outer insulating layer 5 are sequentially covered from the inside out.

[0055] The difference is that a conductive layer 4 is provided between the heating layer 3 and the first outer insulating layer 5 on each of the left and right sides of the main body, while in this preferred embodiment, no conductive layer 4 is provided on the head.

[0056] The inner insulating layer 2, heating layer 3, conductive layer 4, and first outer insulating layer 5 on one side of the main body are not connected to each other, and their edges are not connected.

[0057] Specifically, the bottom of the heating layer 3 on the left side of the main body is connected to the left side of the heating layer 3 on the head, and the bottom of the heating layer 3 on the right side of the main body is connected to the right side of the heating layer 3 on the head.

[0058] As attached Figure 1 , 4 As shown in Figure 7, a heating circuit is formed that extends downward from one side of the body to the head, and then extends upward from the head to the other side of the body.

[0059] Even better, the conductive layer 4 extends from the waist of the body to the end of the body away from the head, but the ends of the two conductive layers 4 on the left and right sides are not connected or connected.

[0060] In addition, an electrode mounting area is provided on the top of the body, that is, on the end opposite to the head.

[0061] In addition, a second outer insulating layer 6 is also covered on the outside of the support layer 1. This layer covers the first outer insulating layer 5 that covers the head and the body, as well as the support layer 1, inner insulating layer 2, heating layer 3, and conductive layer 4 structure exposed around the body. This prevents them from coming into contact with the oxidizing atmosphere, effectively delaying the high-temperature oxidation of the material and improving the product life.

[0062] The ceramic high-temperature heating element provided in this embodiment has a cross-section shaped like a football field track in the body section of the support layer 1. Furthermore, it is preferable that the ceramic high-temperature heating element as a whole has a sheet-like structure.

[0063] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics of the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A ceramic high-temperature heat-generating body, characterized by: It includes a support layer, which includes a body and a head connected to one end of the body; separate, non-communicating functional layers are provided on the left and right sides of the body, and a functional layer is also provided on the head, forming a heating circuit that extends from one side of the body to the head and then to the other side of the body.

2. The ceramic high-temperature heat generator according to claim 1, characterized by: The body and / or head are rotating structures.

3. The ceramic high-temperature heat generator according to claim 2, characterized by: The head is spherical, with the bottom surface of the spherical crown connected to one end of the body.

4. The ceramic high-temperature heating element according to any one of claims 1 to 3, characterized in that: The body and head are an integral structure.

5. The ceramic high-temperature heat generator according to claim 4, characterized by: The functional layer of the body includes a heating layer and a conductive layer, and the functional layer of the head includes a heating layer, together forming a heating element structure.

6. The ceramic high-temperature heat generator according to claim 5, characterized by: The heating element structure is covered with a second outer insulating layer.

7. The ceramic high-temperature heat generator according to claim 6, characterized by: The conductive layer extends from the waist of the heating element structure to the end opposite the head.

8. The ceramic high-temperature heating element according to any one of claims 5 to 7, characterized in that: The cross-section of the main body section of the heating element structure is shaped like a football field track.

9. The ceramic high-temperature heat generator according to claim 8, characterized by: An electrode mounting area is provided on the end of the heating element structure that is away from the head.

10. The ceramic high-temperature heat generator according to claim 9, characterized by: The heating element has a sheet-like structure.

Images