Ceramic heating sheet with double heating layers

Abstract

The utility model provides a ceramic heating sheet with double heating layers, which comprises an upper ceramic sheet, a first heating unit, a middle ceramic sheet, a second heating unit and a lower ceramic sheet which are sequentially connected. The length of the second tail longitudinal heating resistor is equal to that of the first tail longitudinal heating resistor; and the length of the second tail transverse heating resistor is equal to the sum of the length of the second transverse heating resistor and the length of one first transverse heating resistor, so that the heating of the heating sheet is uniform, and the service life of the ceramic heating sheet is prolonged.

Description

Technical Field

[0001] The utility model relates to a ceramic heating sheet, in particular to a ceramic heating sheet with a double-layer heating layer. Background Art

[0002] The ceramic heating sheet is a new generation of high-efficiency and green environmental protection heating device, which is widely used in various heating products such as industrial and agricultural technologies, communications, medical treatment, and daily life, for providing heat sources for heating components or directly serving as heating components.

[0003] At present, the ceramic heating sheets on the domestic and foreign markets are flat structures composed of ceramic sheets, heating resistors, and leads. The heating resistors are located between two ceramic sheets, and the leads are electrically connected to the heating resistors. Limited by the heating power, the heating area of each heating sheet is small, and the heating area is concentrated in the middle of the ceramic heating sheet, which makes the volume of the ceramic heating sheet large, but the heating area is small; and due to being concentrated in the middle of the ceramic heating sheet for a long time, the service life of the ceramic heating sheet is further reduced. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a ceramic heating sheet with a double-layer heating layer, so that the heating of the heating sheet is uniform and the service life of the ceramic heating sheet is improved.

[0005] The utility model is realized as follows: a ceramic heating sheet with a double-layer heating layer includes an upper ceramic sheet, a first heating unit, a middle ceramic sheet, a second heating unit, and a lower ceramic sheet. The upper ceramic sheet, the first heating unit, the middle ceramic sheet, the second heating unit, and the lower ceramic sheet are connected in sequence. The first heating unit includes a first positive electrode, a first negative electrode, a first head longitudinal heating resistor, a first tail longitudinal heating resistor, at least one first middle longitudinal heating resistor, and a plurality of first transverse heating resistors; one end of the first head longitudinal heating resistor is connected to the first positive electrode, one end of the first tail longitudinal heating resistor is connected to the first negative electrode, and the other end of the first head longitudinal heating resistor, the plurality of first middle longitudinal heating resistors, and the other end of the first tail longitudinal heating resistor are sequentially connected through the plurality of first transverse heating resistors;

[0006] The second heating unit includes a second positive electrode, a second negative electrode, a second head longitudinal heating resistor, a second tail longitudinal heating resistor, at least one second middle longitudinal heating resistor, a plurality of second transverse heating resistors, and a second tail transverse heating resistor; one end of the second head longitudinal heating resistor is connected to the second positive electrode, one end of the second tail longitudinal heating resistor is connected to the second negative electrode, and the other end of the second tail longitudinal heating resistor is connected to one end of the second tail transverse heating resistor; the other end of the second head longitudinal heating resistor, the plurality of second middle longitudinal heating resistors, and the other end of the second tail transverse heating resistor are sequentially connected through the plurality of second transverse heating resistors;

[0007] The length of the second tail longitudinal heating resistor is equal to that of the first tail longitudinal heating resistor; the length of the second tail transverse heating resistor is equal to the length of the second transverse heating resistor plus the length of a first transverse heating resistor.

[0008] Furthermore, the width of the first transverse heating resistor is greater than that of the first intermediate longitudinal heating resistor.

[0009] Furthermore, the ratio of the width of the first transverse heating resistor to the width of the first intermediate longitudinal heating resistor is 1.1 - 1.2:1.

[0010] Furthermore, the widths of the first head longitudinal heating resistor, the first tail longitudinal heating resistor, and the first intermediate longitudinal heating resistor are the same.

[0011] Furthermore, the upper ceramic sheet, the first heating unit, the middle ceramic sheet, the second heating unit, and the lower ceramic sheet form a flat plate-like structure, a curved plate-like structure, or an annular plate-like structure.

[0012] The advantages of the present utility model are as follows: The ceramic heating sheet with a double-layer heating layer of the present utility model adopts a two-layer heating layer structure, and through the complementarity of the two layers of heating, the ceramic heating sheet generates heat evenly and does not concentrate in the middle of the ceramic heating sheet; furthermore, due to the even heating, the ceramic is not easily damaged, and the service life of the ceramic heating sheet is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following further describes the present utility model with reference to the accompanying drawings in conjunction with embodiments.

[0014] Figure 1 ... is a schematic diagram of a ceramic heating sheet with a double-layer heating layer of the present utility model Figure 1 .

[0015] Figure 2 ... is a schematic diagram of the first heating unit of a ceramic heating sheet with a double-layer heating layer of the present utility model.

[0016] Figure 3 ... is a schematic diagram of the second heating unit of a ceramic heating sheet with a double-layer heating layer of the present utility model.

[0017] Figure 4 ... is a schematic diagram of a ceramic heating sheet with a double-layer heating layer of the present utility model Figure 2 .

[0018] Figure 5 ... is a schematic diagram of a ceramic heating sheet with a double-layer heating layer of the present utility model Figure 3 . DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Please refer to Figures 1 to 3 As shown, a ceramic heating sheet with a double-layer heating layer according to the present utility model includes an upper ceramic sheet 1, a first heating unit 2, a middle ceramic sheet 3, a second heating unit 4, and a lower ceramic sheet 5. The upper ceramic sheet 1, the first heating unit 2, the middle ceramic sheet 3, the second heating unit 4, and the lower ceramic sheet 5 are connected in sequence. The first heating unit 2 includes a first positive electrode 21, a first negative electrode 22, a first head longitudinal heating resistor 23, a first tail longitudinal heating resistor 24, at least one first middle longitudinal heating resistor 25, and a plurality of first transverse heating resistors 26. One end of the first head longitudinal heating resistor 23 is connected to the first positive electrode 21, one end of the first tail longitudinal heating resistor 24 is connected to the first negative electrode 22, and the other end of the first head longitudinal heating resistor 23, a plurality of first middle longitudinal heating resistors 25, and the other end of the first tail longitudinal heating resistor 24 are connected in sequence through a plurality of first transverse heating resistors 26;

[0020] The second heating unit 4 includes a second positive electrode 41, a second negative electrode 42, a second head longitudinal heating resistor 43, a second tail longitudinal heating resistor 44, at least one second middle longitudinal heating resistor 45, a plurality of second transverse heating resistors 46, and a second tail transverse heating resistor 47. One end of the second head longitudinal heating resistor 43 is connected to the second positive electrode 41, one end of the second tail longitudinal heating resistor 44 is connected to the second negative electrode 42, and the other end of the second tail longitudinal heating resistor 44 is connected to one end of the second tail transverse heating resistor 47. The other end of the second head longitudinal heating resistor 43, a plurality of second middle longitudinal heating resistors 45, and the other end of the second tail transverse heating resistor 47 are connected in sequence through a plurality of second transverse heating resistors 46;

[0021] The length of the second tail longitudinal heating resistor 44 is equal to the length of the first tail longitudinal heating resistor 24. The length of the second tail transverse heating resistor 47 is equal to the length of the second transverse heating resistor 46 plus the length of one first transverse heating resistor 26.

[0022] Since the heat dissipation is relatively fast at both ends of the ceramic heating sheet, resulting in a lower heating temperature at both ends, while the heating temperature in the middle of the ceramic heating sheet is high. By setting the first heating unit 2 and the second heating unit 4 to complement each other's heat, the ceramic heating sheet can heat evenly, so that the heat is not concentrated in the middle of the ceramic heating sheet, and the service life of the ceramic heating sheet is improved. The first positive electrode 21, the second positive electrode 41, the first negative electrode 22, and the second negative electrode 42 are led out through leads, and then the power supply can be connected for use.

[0023] In this embodiment, preferably, the width L1 of the first transverse heating resistor 26 is greater than the width L2 of the first middle longitudinal heating resistor 25.

[0024] In this embodiment, preferably, the ratio of the width L1 of the first lateral heating resistor 26 to the width L2 of the first intermediate longitudinal heating resistor 25 is 1.1 - 1.2:1. By setting this ratio, the heating energy of the first lateral heating resistor 26 is greater than the heat generation of the first intermediate longitudinal heating resistor 25, making the heat on the entire ceramic heating sheet uniform. A larger width means a larger resistance value, and thus a greater heat generation after power-on. The heating resistors are all set by printing, so their thicknesses are the same.

[0025] In this embodiment, preferably, the first head longitudinal heating resistor 23, the first tail longitudinal heating resistor 24, and the first intermediate longitudinal heating resistor 25 have the same width.

[0026] As Figure 1 shown, the upper ceramic sheet 1, the first heating unit 2, the middle ceramic sheet 3, the second heating unit 4, and the lower ceramic sheet 5 form a flat plate-like structure.

[0027] As Figure 4 shown, the upper ceramic sheet 1, the first heating unit 2, the middle ceramic sheet 3, the second heating unit 4, and the lower ceramic sheet 5 form a curved plate-like structure.

[0028] As Figure 5 shown, the upper ceramic sheet 1, the first heating unit 2, the middle ceramic sheet 3, the second heating unit 4, and the lower ceramic sheet 5 form an annular plate-like structure.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative only, rather than for limiting the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should all be covered by the scope protected by the claims of the present invention.

Claims

1. A ceramic heating sheet with a double-layer heating layer, comprising an upper ceramic sheet, a first heating unit, a middle ceramic sheet, a second heating unit and a lower ceramic sheet, wherein the upper ceramic sheet, the first heating unit, the middle ceramic sheet, the second heating unit and the lower ceramic sheet are connected in sequence, and is characterized in that: The first heating unit includes a first positive electrode, a first negative electrode, a first head longitudinal heating resistor, a first tail longitudinal heating resistor, at least one first middle longitudinal heating resistor and a plurality of first transverse heating resistors; one end of the first head longitudinal heating resistor is connected to the first positive electrode, one end of the first tail longitudinal heating resistor is connected to the first negative electrode, and the other end of the first head longitudinal heating resistor, the plurality of first middle longitudinal heating resistors and the other end of the first tail longitudinal heating resistor are connected in sequence through the plurality of first transverse heating resistors; The second heating unit includes a second positive electrode, a second negative electrode, a second head longitudinal heating resistor, a second tail longitudinal heating resistor, at least one second middle longitudinal heating resistor, a plurality of second transverse heating resistors and a second tail transverse heating resistor; one end of the second head longitudinal heating resistor is connected to the second positive electrode, one end of the second tail longitudinal heating resistor is connected to the second negative electrode, and the other end of the second tail longitudinal heating resistor is connected to one end of the second tail transverse heating resistor; the other end of the second head longitudinal heating resistor, the plurality of second middle longitudinal heating resistors and the other end of the second tail transverse heating resistor are connected in sequence through the plurality of second transverse heating resistors; The length of the second tail longitudinal heating resistor is equal to the length of the first tail longitudinal heating resistor; the length of the second tail transverse heating resistor is equal to the length of the second transverse heating resistor plus the length of one first transverse heating resistor.

2. The ceramic heating sheet with a double-layer heating layer according to claim 1, characterized in that: The width of the first transverse heating resistor is greater than the width of the first middle longitudinal heating resistor.

3. The ceramic heating sheet with a double-layer heating layer according to claim 2, characterized in that: The ratio of the width of the first transverse heating resistor to the width of the first middle longitudinal heating resistor is: 1.1～1.2:1。 4. The ceramic heating sheet with a double-layer heating layer according to claim 1, characterized in that: The widths of the first head longitudinal heating resistor, the first tail longitudinal heating resistor and the first middle longitudinal heating resistor are the same.

5. The ceramic heating sheet with a double-layer heating layer as described in claim 1, characterized in that: The upper ceramic sheet, the first heating unit, the middle ceramic sheet, the second heating unit and the lower ceramic sheet form a flat plate structure, a curved plate structure or an annular plate structure.

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