CERAMIC ELECTRIC HEATING ELEMENT

Abstract

Disclosed is a ceramic electric heating element. The ceramic electric heating element is completely wrapped by an insulating layer. The ceramic electric heating element can prevent the occurrence of a short circuit when the ceramic electric heating element is in use or is installed. The strength of the ceramic electric heating element is increased, and the shock resistance is enhanced. The service life of the ceramic electric heating element is prolonged, and the power-on duration of the ceramic electric heating element is prolonged. Moreover, the process is simplified, the structure is simple, and the cost is low.

Claims

1. A ceramic electric heating element wherein: the ceramic electric heating element has six layers that include, from the inside out, an inner conducting layer (1), an inner resistive layer (6), an inner insulating layer (2), an outer resistive layer (3), an outer conducting layer (4), and an outer insulating layer (5), respectively; an upper tip portion of the ceramic electric heating element is completely wrapped by the outer insulating layer; the inner conducting layer (1) is located in the center of the ceramic electric heating element; the inner resistive layer (6) wraps the inner conducting layer (1) on the outside; the inner insulating layer (2) wraps the inner resistive layer (6) on the outside, and the inner insulating layer (2) is divided into two segments, with the peripheral profile of the lower segment being greater than that of the upper segment; the outer resistive layer (3) wraps the upper part of the inner insulating layer (2) on the outside, and the outer resistive layer (3) is divided into two segments, with the peripheral profile of the upper segment of the outer resistive layer (3) being less than that of the lower segment of the inner insulating layer (2); the outer conducting layer (4) wraps the lower segment of the outer resistive layer (3) on the outside, and the outer conducting layer (4) is divided into two segments, with the peripheral profile of the lower segment equaling to that of the lower segment of the inner insulating layer (2), and the peripheral profile of the upper segment equaling to that of the upper segment of the outer resistive layer (6); and the outer insulating layer (5) wraps the upper segment of the outer conducting layer (4) and the upper segment of the outer resistive layer (3) on the outside, with the peripheral profile of a lower segment of the outer insulating layer (5) equaling to that of the lower segment of the outer conducting layer (4); and the lower part of the inner conducting layer (1) has a spot (7) where a central electrode is located, the upper end of the inner resistive layer (6) has a connecting hole (8), and the outside of the lower part of the outer conducting layer (4) has a spot (9) where a side electrode is connected.

2. The ceramic electric heating element of claim 1, wherein, the ceramic electric heating element is a cylinder.

3. The ceramic electric heating element of claim 1, wherein, the ceramic electric heating element is a flat-shaped body.

4. The ceramic electric heating element of claim 1, wherein, the spot (7) where the central electrode is located is solid.

5. The ceramic electric heating element of claim 4, wherein, the ceramic electric heating element is a cylinder.

6. The ceramic electric heating element of claim 4, wherein, the ceramic electric heating element is a flat-shaped body.

7. A ceramic electric heating element wherein: the ceramic electric heating element has four layers that include, from the inside out, an inner conducting layer (1), an inner insulating layer (2), a resistive layer (11), and an outer insulating layer (5), respectively; the inner conducting layer (1) is located in the center of the ceramic electric heating element; the inner insulating layer (2) wraps the inner conducting layer (1) on the outside, and the inner insulating layer (2) is divided into two segments, with the peripheral profile of the lower segment being greater than that of the upper segment; the resistive layer (11) wraps the upper part of the inner insulating layer (2) on the outside, and the resistive layer (11) is divided into two segments, with the peripheral profile of the upper segment being less than that of the lower segment, and the peripheral profile of the lower segment of the resistive layer (11) equaling to that of the lower segment of the inner insulating layer (2); and the outer insulating layer (5) wraps the upper segment of the resistive layer (11) on the outside, with the peripheral profile of the outer insulating layer (5) equaling to that of the lower segment of the resistive layer (11); and the lower part of the inner conducting layer (1) has a spot (7) where a central electrode is located, the upper end of the inner resistive layer (11) has a connecting hole (8), and the outside of the lower part of the resistive layer (11) has a spot (9) where a side electrode is connected.

8. The ceramic electric heating element of claim 7, wherein, the ceramic electric heating element is a cylinder.

9. The ceramic electric heating element of claim 7, wherein, the ceramic electric heating element is a flat-shaped body.

10. The ceramic electric heating element of claim 7, wherein, the spot (7) where the central electrode is located is solid.

11. The ceramic electric heating element of claim 10, wherein, the ceramic electric heating element is a cylinder.

12. The ceramic electric heating element of claim 10, wherein, the ceramic electric heating element is a flat-shaped body.

Description

DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 is a structure of an existing ceramic electric heating element;

[0027] FIG. 2 is an internal structural representation of Example 1;

[0028] FIG. 3 is an internal structural representation of Example 2;

[0029] FIG. 4 is an internal structural representation of Example 3; and

[0030] FIG. 5 is an internal structural representation of Example 5.

[0031] Explanation of reference numbers: 1. inner conducting layer; 2.

[0032] inner insulating layer; 3. outer resistive layer; 4 outer conducting layer; 5. outer insulating layer; 6. inner resistive layer; 7. spot where a central electrode is located; 8. connecting hole; 9. spot where the side electrode is connected; 10. electrically conductive cover, 11. resistive layer.

DETAILED DESCRIPTION

[0033] The present invention will be introduced below through examples as shown in the accompanying drawings, however the present invention will not be limited to the embodiments introduced, and any improvements or replacements made on the basis of the spirit of the present examples will still belong to the scope as claimed in the claims of the present invention:

[0034] Example 1: In the ceramic electric heating element as shown in FIG. 2, the ceramic electric heating element is a two-layered ceramic electric heating element and includes an inner resistive layer 1, where the ceramic electric heating element is completely wrapped by an outer insulating layer 5, and an electrically conductive cover 10 is provided on both ends of the ceramic electric heating element.

[0035] The employment of the ceramic electric heating element according to this example can prevent a short circuit resulting from over-lapping the ceramic electric heating element with metal in the processes of installation and use, and can also prevent a a short circuit due to carbon deposition on the surface of the ceramic electric heating element after using it for a long period of time. In addition, the ceramic electric heating element has advantages of high strength, long service life and long one-time power-on duration.

[0036] The ceramic electric heating element according to this example is a cylinder with a strength of 25 KG, a service life of 25,000 switching cycles before failure, and a one-time power-on duration of up to 1.2 minutes.

[0037] Example 2: In the ceramic electric heating element as shown in FIG. 3, an upper tip portion of the ceramic electric heating element is completely wrapped by an insulating layer. The ceramic electric heating element has six layers, and the ceramic electric heating element has, from the inside out, an inner conducting layer 1, an inner resistive layer 6, an inner insulating layer 2, an outer resistive layer 3, an outer conducting layer 4, and an outer insulating layer 5, respectively.

[0038] The ceramic electric heating element according to this example is a cylinder, where the inner conducting layer 1 is located in the center of the ceramic electric heating element; the inner resistive layer 6 wraps the inner conducting layer 1 on the outside; the inner insulating layer 2 wraps the inner conducting layer 6 on the outside, and the inner insulating layer 2 is divided into two segments, with the diameter of the lower segment being greater than that of the upper segment; the outer resistive layer 3 wraps the upper part of the inner insulating layer 2 on the outside, and the outer resistive layer 3 is divided into two segments, with the diameter of the upper segment of the outer resistive layer 3 being less than that of the lower segment of the inner insulating layer 2; the outer conducting layer 4 wraps the lower segment of the outer resistive layer 3 on the outside, and the outer conducting layer 4 is divided into two segments, with the diameter of the lower segment equaling to that of the lower segment of the inner insulating layer 2, and the diameter of the upper segment equaling to that of the upper segment of the outer resistive layer 3; the outer insulating layer 5 wraps the upper segment of the outer conducting layer 4 and the upper segment of the outer resistive layer 3 on the outside, with the diameter of the outer insulating layer 5 equaling to that of the lower segment of the outer conducting layer 4; and the lower part of the inner conducting layer 1 is a spot 7 where a central electrode is located, the upper end of the inner resistive layer 6 has a connecting hole 8, and the outside of the lower part of the outer conducting layer 4 is a spot 9 where a side electrode is connected. The spot 7 where the central electrode is located is solid.

[0039] The employment of the ceramic electric heating element according to this example allows for a quick start and quick heating up, can prevent a short circuit resulting from over-lapping the ceramic electric heating element with metal in the processes of installation and use, and can also prevent a short circuit due to carbon deposition on the surface of the ceramic electric heating element after using it for a long period of time. In addition, the ceramic electric heating element has advantages of high strength, long service life and long one-time power-on duration.

[0040] The ceramic electric heating element according to this example has a strength of 45 KG, a service life of 40,000 switching cycles before failure, and a one-time power-on duration up to 8 minutes.

[0041] Example 3: In the ceramic electric heating element as shown in FIG. 4, an upper tip portion of the ceramic electric heating element is completely wrapped by an insulating layer. The ceramic electric heating element has five layers, and the ceramic electric heating element has, from the inside out, an inner conducting layer 1, an inner insulating layer 2, an outer resistive layer 3, an outer conducting layer 4, and an outer insulating layer 5, respectively.

[0042] The ceramic electric heating element according to this example is a flat-shaped body, where the inner conducting layer 1 is located in the center of the ceramic electric heating element; the inner insulating layer 2 wraps the inner conducting layer 1 on the outside, and the inner insulating layer 2 is divided into two segments, with the peripheral profile of the lower segment being greater than that of the upper segment; the outer resistive layer 3 wraps the upper part of the inner insulating layer 2 on the outside, and the outer resistive layer 3 is divided into two segments, with the peripheral profile of the lower segment being less than that of the upper segment, and the peripheral profile of the upper segment of the outer resistive layer 3 being less than that of the lower segment of the inner insulating layer 2; the outer conducting layer 4 wraps the lower segment of the outer resistive layer 3 on the outside, and the outer conducting layer 4 is divided into two segments, with the peripheral profile of the lower segment equaling to that of the lower segment of the inner insulating layer 2, and the peripheral profile of the upper segment equaling to that of the upper segment of the outer resistive layer 3; the outer insulating layer 5 wraps the upper segment of the outer conducting layer 4 and the upper segment of the outer resistive layer 3 on the outside, with the peripheral profile of the outer insulating layer 5 equaling to that of the lower segment of the outer conducting layer 4; and the lower part of the inner conducting layer 1 is a spot 7 where a central electrode is located, the upper end of the inner insulating layer 2 has a connecting hole 8, and the outside of the lower part of the outer conducting layer 4 is a spot 9 where a side electrode is connected. The spot 7 where the central electrode is located is solid, and the ceramic electric heating element is a cylinder.

[0043] The employment of the ceramic electric heating element according to this example can prevent a short circuit resulting from over-lapping the ceramic electric heating element with metal in the processes of installation and use, and can also prevent a short circuit due to carbon deposition on the surface of the ceramic electric heating element after using it for a long period of time. In addition, the ceramic electric heating element has advantages of high strength and long service life. Moreover, this example further has advantages of a simplified process and a simple structure.

[0044] The ceramic electric heating element according to this example has a strength of 35 KG, a service life of 30,000 switching cycles before failure, and a one-time power-on duration up to 6 minutes.

[0045] Example 4: In the ceramic electric heating element as shown in FIG. 5, the ceramic electric heating element is completely wrapped by an insulating layer.

[0046] The ceramic electric heating element has four layers, and the ceramic electric heating element has, from the inside out, an inner conducting layer 1, an inner insulating layer 2, a resistive layer 11, and an outer insulating layer 5, respectively.

[0047] The ceramic electric heating element according to this example is a flat-shaped body, where the inner conducting layer 1 is located in the center of the ceramic electric heating element; the inner insulating layer 2 wraps the inner conducting layer 1 on the outside, and the inner insulating layer 2 is divided into two segments, with the peripheral profile of the lower segment being greater than that of the upper segment; the resistive layer 11 wraps the upper part of the inner insulating layer 2 on the outside, and the resistive layer 11 is divided into two segments, with the peripheral profile of the upper segment being less than that of the lower segment, and the peripheral profile of the lower segment of the resistive layer 11 equaling to that of the lower segment of the inner insulating layer 2; the outer insulating layer 5 wraps the upper segment of the resistive layer 11 on the outside, with the peripheral profile of the outer insulating layer 5 equaling to that of the lower segment of the resistive layer 11; and the lower part of the inner conducting layer 1 is a spot 7 where a central electrode is located, the upper end of the resistive layer 11 has a connecting hole 8, and the outside of the lower part of the outer resistive layer 11 is a spot 9 where a side electrode is connected.

[0048] The employment of the ceramic electric heating element according to this example can prevent a short circuit resulting from over-lapping the ceramic electric heating element with metal in the processes of installation and use, and can also prevent a short circuit due to carbon deposition on the surface of the ceramic electric heating element after using it for a long period of time. In addition, the ceramic electric heating element has advantages of high strength and long service life. Moreover, this example further has advantages of a simplified process and a low cost.

[0049] The ceramic electric heating element according to this example has a strength of 30 KG, a service life of 30,000 switching cycles before failure, and a one-time power-on duration up to 5 minutes.