CN-224231114-U - Thermocouple

CN224231114UCN 224231114 UCN224231114 UCN 224231114UCN-224231114-U

Abstract

The utility model relates to a thermocouple which comprises a hot electrode, a ceramic shell, a metal sheet and a junction box, wherein the bottom of the ceramic shell is provided with an opening, the metal sheet is arranged at the opening, the surface of the metal sheet faces the outside of the ceramic shell, the back surface of the metal sheet faces an inner cavity of the ceramic shell, a superconducting insulating layer is arranged on the surface of the metal sheet, the hot end of the hot electrode stretches into the ceramic shell and is connected with the back surface of the metal sheet, and the cold end of the hot electrode stretches out of the ceramic shell and is connected with the junction box. By arranging the superconducting insulating layer on the surface of the metal sheet, the design can obviously reduce the electric leakage problem caused by the insulation defect at the interface of the metal piece and the ceramic shell, thereby ensuring the safe electric connection between the parts of the hot electrode.

Inventors

XU KEMING
DONG JUN
DONG MING

Assignees

工创(中山)电器科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250614
Priority Date: 20250401

Claims (7)

1. The thermocouple comprises a hot electrode, a ceramic shell, a metal sheet and a junction box, and is characterized in that the bottom of the ceramic shell is provided with an opening, the metal sheet is arranged at the opening, the surface of the metal sheet faces the outside of the ceramic shell, and the back surface of the metal sheet faces an inner cavity of the ceramic shell; the surface of the metal sheet is provided with a superconducting insulating layer; The hot end of the hot electrode extends into the back surface of the connecting metal sheet in the ceramic shell, and the cold end of the hot electrode extends out of the ceramic shell to be connected with the junction box.
2. The thermocouple of claim 1, wherein the metal sheet is a planar metal sheet.
3. The thermocouple of claim 1, wherein the metal sheet is an arcuate metal sheet.
4. A thermocouple as in claim 3 wherein said metal sheet protrudes toward the interior cavity of the ceramic housing to form said arcuate metal sheet.
5. The thermocouple of claim 1, wherein the thermode is comprised of two wires of different composition welded together at one end to form the hot end and at the other end to form a free end for connection to a junction box.
6. The thermocouple of claim 1, wherein the top of the ceramic housing is provided with a wire guide hole for facilitating the passage of a wire therethrough.
7. The thermocouple of claim 1, further comprising a connecting piece, wherein the connecting piece is provided with a clamping opening which is convenient for clamping the ceramic shell, the connecting piece is provided with a bolt hole at the periphery of the clamping opening, and the ceramic shell is clamped at the clamping opening.

Description

Thermocouple Technical Field The present utility model relates to thermocouples. Background Thermocouples, which are a common temperature measuring element, have been widely used in industrial control, environmental monitoring, and other temperature sensing in high temperature or special environments. In the prior art, the structural design of the thermocouple has certain defects, especially at the interface of the metal connecting piece and the ceramic shell, the insulation failure can be caused and the electric leakage phenomenon is caused because the metal piece is exposed partially or the edge is easy to be polluted in the connecting process. The leakage problem not only reduces the accuracy of temperature measurement, but also can cause potential safety hazards under high temperature or severe environment, and influences the reliability and stability of the whole system. Disclosure of utility model The utility model aims to provide a thermocouple with high overall insulation performance. The purpose of the utility model is realized in the following way: The thermocouple comprises a hot electrode, a ceramic shell, a metal sheet and a junction box, wherein the bottom of the ceramic shell is provided with an opening, the metal sheet is arranged at the opening, the surface of the metal sheet faces to the outside of the ceramic shell, and the back surface of the metal sheet faces to the inner cavity of the ceramic shell; the surface of the metal sheet is provided with a superconducting insulating layer; The hot end of the hot electrode extends into the back surface of the connecting metal sheet in the ceramic shell, and the cold end of the hot electrode extends out of the ceramic shell to be connected with the junction box. By arranging the superconducting insulating layer on the surface of the metal sheet, the design can obviously reduce the electric leakage problem caused by the insulation defect at the interface of the metal piece and the ceramic shell, thereby ensuring the safe electric connection between the parts of the hot electrode. The application of the superconducting insulating layer not only enhances the overall insulating performance, but also ensures that the electric transmission between the hot end and the cold end is more stable, and avoids measurement errors caused by electric leakage, thereby improving the accuracy of temperature measurement and the long-term stability of the system. On the basis of keeping the high temperature resistance of the ceramic shell, the design ensures that the equipment can still keep a good working state under high temperature and severe environment through the protection of the superconducting insulating layer, and prolongs the service life of the equipment. In the design, the metal sheet is arranged at the bottom opening of the ceramic shell, the hot end of the hot electrode is directly connected with the back surface of the metal sheet, the structure is compact, standardized production and installation are convenient to realize, and the requirements of practical engineering application are met. The first object of the utility model can also be solved by the following technical measures: further, the metal sheet is a planar metal sheet. The planar metal sheet structure simplifies the manufacturing and assembling processes, so that the product has higher consistency and stability, and is beneficial to reducing the production cost and improving the reliability. Further, the metal sheet is an arc-shaped metal sheet. The arc design can adapt to ceramic shell's structure curved surface better, promotes the contact compactness between sheetmetal and the ceramic shell, helps realizing more even temperature transmission and thermoelectric conversion effect to improve measurement accuracy. The arc-shaped metal sheet can enable the thermocouple to be in closer and even contact with the heating pipe body. The structure not only improves the heat conduction efficiency, ensures that the temperature acquisition is more accurate and stable, but also facilitates matching of heating pipe bodies with different specifications, simplifies the replacement and installation processes, thereby reducing the maintenance cost and improving the overall reliability of the system. Further, the metal sheet protrudes towards the inner cavity of the ceramic shell to form the arc-shaped metal sheet. The convex design further optimizes the combination mode of the metal sheet and the inside of the ceramic shell, enhances the firmness of the whole structure, and can effectively prevent the risk of poor contact caused by vibration or external force. Further, the thermode is composed of two wires with different components, one ends of the two wires are welded together to form the hot end, and the other ends of the two wires are free ends for connecting a junction box. The two leads are welded at one end to form a hot end to form a stable and reliable thermoelectric contact, and the other end is