Thermocouple

Abstract

The thermocouple comprises a thermode, a ceramic column, a metal sheet and a junction box, the top of the ceramic column is provided with an opening, an inner cavity of the ceramic column is provided with a wire hole convenient for the thermode to pass through, and the top opening is communicated with the wire hole; the metal sheet is arranged at the top opening, and a superconductive insulating layer is arranged on the surface of the metal sheet; the hot end of the thermode penetrates through the wire hole to be connected with the metal sheet, and the cold end of the thermode penetrates through the wire hole to extend out of the ceramic column to be connected with the junction box; according to the structure, the metal sheet is arranged at the top of the ceramic column and the superconductive insulating layer is applied to the surface of the ceramic column, so that high-reliability electrical isolation between the hot end and the cold end is realized. On one hand, the superconducting insulating layer can significantly reduce the risk of electric leakage, and avoids measurement signal crosstalk and noise interference.

Description

TECHNICAL FIELD

[0001] The utility model relates to a thermocouple. BACKGROUND

[0002] As a kind of widely used in industrial and scientific research field temperature sensing element, because of its simple structure, response is fast, measurement range is widely used.

[0003] Common thermocouple is usually composed of two different metals or alloy materials, when there is temperature difference between hot end and cold end, that is, thermoelectric electromotive force is generated, to realize temperature measurement.

[0004] In prior art, there is certain defect in the structure design of thermocouple, especially in the interface of metal connecting piece and ceramic shell, due to the existence of partial exposure or edge vulnerable to pollution in the connecting process of metal piece, it can cause insulation failure, cause electric leakage phenomenon.This electric leakage problem not only reduces the accuracy of temperature measurement, and in high temperature or harsh environment, it can also cause safety hazard, affect the reliability and stability of the whole system. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of thermocouple of improving insulation performance and stable electric property transmission.

[0006] The utility model aims at providing a kind of thermocouple of improving insulation performance and stable electric property transmission.

[0007] A kind of thermocouple, including thermoelectrode, ceramic column, metal sheet and terminal box, the top opening of the ceramic column, the line hole for facilitating thermoelectrode to pass through is opened in the inner chamber of the ceramic column, the top opening and line hole are communicated;

[0008] The metal sheet is arranged in top opening, and the surface of the metal sheet is provided with superconducting insulation layer;

[0009] The hot end of the thermoelectrode is connected with metal sheet by passing through line hole, and the cold end of the thermoelectrode is connected with terminal box by passing through line hole and extending out of ceramic column.

[0010] The structure is realized high reliable electrical isolation between hot end and cold end by setting metal sheet on the top of ceramic column and applying superconducting insulation layer on its surface.On the one hand, superconducting insulation layer can significantly reduce the risk of electric leakage, avoid measurement signal crosstalk and noise interference;On the other hand, the direct welding of metal sheet and hot end of thermoelectrode ensures the stable transmission of thermoelectric potential, so as to improve the precision of temperature measurement.In addition, ceramic column itself has excellent high-temperature resistance and chemical corrosion resistance, can still keep structure integrity in harsh environment, prolongs the service life of thermocouple.

[0011] The purpose of the utility model can also be solved by the following technical measures:

[0012] Further, the metal sheet is a planar metal sheet.

[0013] Defining the metal sheet as a planar form can simplify the manufacturing process and make the coating of the superconducting insulation layer more uniform and controllable in thickness, thereby further improving the insulation performance and process yield. The planar metal sheet closely fits the top of the ceramic column, effectively eliminating interface gaps, reducing thermal resistance, ensuring that the thermoelectric potential signal is quickly and stably transmitted to the cold end, reducing response time, and improving the dynamic temperature measurement performance of the system.

[0014] Further, the hot electrode includes a first wire and a second wire, one end of the first wire and the second wire is welded together to form the hot end, the other end of the first wire is a cold end for connecting the terminal box, and the other end of the second wire is a cold end for connecting the terminal box.

[0015] The first wire and the second wire are distinct, welded to form a hot end, and the other end is connected to the terminal box, respectively. This structure can be widely compatible with various industrial terminal boxes and thermocouple temperature measuring instruments, and is suitable for use in high temperature, high interference, and complex electrical environments, and has good versatility and stability.

[0016] In this hot electrode structure, one end of the first wire and the second wire is welded to form a hot end, which can ensure that the wires of two different materials form a stable thermal junction at high temperature, effectively improving the generation efficiency of thermoelectric potential and the response sensitivity of temperature measurement. The reliability of the hot end welding point is crucial to the accuracy of temperature measurement, and this structure can maintain good physical connection and electrical performance under high temperature working conditions.

[0017] The other end of the wire is independently led out as a cold end and connected to the terminal box, which is beneficial to the precise separation of cold end compensation and signal processing. This kind of cold end structure facilitates the independent identification and conversion of the signal of each wire by the measuring equipment, significantly improving the performance of the temperature measurement system in terms of anti-interference and signal stability.

[0018] Further, the wire hole is built-in with a ceramic partition plate, the ceramic partition plate separates the wire hole into a first wire hole and a second wire hole, and a cavity is arranged between the top opening of the ceramic column and the upper end of the wire hole;

[0019] The first wire passes through the first wire hole, and the upper end of the first wire is placed in the cavity, and the lower end of the first wire extends out of the ceramic column to form the cold end;

[0020] The second wire passes through the second wire hole, and the upper end of the second wire is placed in the cavity, and the lower end of the second wire extends out of the ceramic column to form the cold end;

[0021] The bottom of the metal sheet and the hot end are welded.

[0022] The cold end is connected to the terminal box, and the first wire and the second wire between the ceramic column and the terminal box are sleeved with a heat shrink tube.

[0023] The structure divides the wire hole into a first wire hole and a second wire hole by arranging a ceramic partition plate inside the ceramic column, so that the first wire and the second wire maintain good electrical isolation and mechanical stability when passing through the ceramic column, effectively preventing measurement errors caused by wire contact, short circuit or interference.

[0024] The cavity structure arranged between the top and the wire hole provides a relatively spacious operation area for the narrow space inside the ceramic, facilitating the welding of the upper ends of the first wire and the second wire in the cavity to form a hot end, and simultaneously effectively welding the hot end with the bottom of the metal sheet, ensuring stable thermal contact between the hot end and the metal sheet, improving the thermal response speed and thermoelectric signal transmission efficiency.

[0025] In addition, the cold ends of the first wire and the second wire are sleeved with heat shrink tubes after extending out of the ceramic column, which plays a good insulation, sealing and stress buffering role, preventing the performance of the wires from being affected by bending, friction or environmental pollution, and further improving the durability and stability of the thermocouple in high temperature and harsh environments.

[0026] Further, the outer wall of the ceramic column is provided with a ceramic outer ring which is integrally formed with the ceramic column.

[0027] The beneficial effects of the present utility model are as follows:

[0028] The metal sheet surface is covered with a superconducting insulation layer, which effectively isolates the hot end from external electrical interference, reduces the risk of electric leakage, ensures stable output of thermoelectric signals, and improves the safety and long-term stability of system operation.

[0029] The cavity structure provides a relatively spacious operation area for the narrow space inside the ceramic, facilitating the welding of the upper ends of the first wire and the second wire in the cavity to form a hot end, and simultaneously effectively welding the hot end with the bottom of the metal sheet, ensuring stable thermal contact between the hot end and the metal sheet, improving the thermal response speed and thermoelectric signal transmission efficiency.

[0030] The ceramic column structure is firm and resistant to high temperature, and the wires are arranged separately by the built-in ceramic partition plate, reducing thermal coupling and interference between the wires; the cold end wires are sleeved with heat shrink tubes, further protecting the electrical connection parts and enhancing the insulation and mechanical interference resistance.

[0031] The utility model discloses, ceramic column outer wall is equipped with the ceramic outer ring of integrated mould, both convenient for the positioning and fixed of thermocouple in the equipment, and provide reference for subsequent spring loading or support structure, guarantee the good contact of hot end to keep in the use process, thereby prolong the service life of overall equipment. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the schematic view of thermocouple.

[0033] Figure 2 It is the front view of thermocouple.

[0034] Figure 3 It is the sectional view of thermocouple.

[0035] Figure 4 It is the assembly drawing of thermocouple.

[0036] Figure 5 It is another angle assembly drawing of thermocouple. DETAILED DESCRIPTION

[0037] The utility model will be further described in connection with the drawings and examples:

[0038] Example, combine Figures 1 to 5 As shown in the figure, a thermocouple, including thermoelectric pole 31, ceramic column 32, sheet metal 33 and terminal box 34, the top opening 321 of ceramic column 32, the line hole 322 that is convenient for thermoelectric pole 31 to pass through is opened in the inner chamber of ceramic column 32, the top opening 321 and line hole 322 are communicated;

[0039] The sheet metal 33 is arranged in the top opening 321, and the surface of the sheet metal 33 is provided with a superconducting insulation layer 6.

[0040] The hot end 311 of thermoelectric pole 31 passes through line hole 322 and is connected with sheet metal 33, and the cold end 312 of thermoelectric pole 31 passes through line hole 322 and extends out of ceramic column 32 to be connected with terminal box 34.

[0041] Further, the sheet metal 33 is a planar sheet metal.

[0042] Further, the thermoelectric pole 31 includes a first wire 8 and a second wire 9, one end of the first wire 8 and the second wire 9 is welded together to form the hot end 311, the other end of the first wire 8 is the cold end 312 for connecting the terminal box 34, and the other end of the second wire 9 is the cold end 312 for connecting the terminal box 34.

[0043] Further, the wire hole 322 is built-in with a ceramic partition 10, which separates the wire hole 322 into a first wire hole 101 and a second wire hole 102, and a cavity 103 is set between the top opening 321 of the ceramic column 32 and the upper end of the wire hole 322;

[0044] The first wire 8 passes through the first wire hole 101, and the upper end of the first wire 8 is placed in the cavity 103, and the lower end of the first wire 8 extends out of the ceramic column 32 to form the cold end 312;

[0045] The second wire 9 passes through the second wire hole 102, and the upper end of the second wire 9 is placed in the cavity 103, and the lower end of the second wire 9 extends out of the ceramic column 32 to form the cold end 312;

[0046] The bottom of the metal sheet 33 is welded with the hot end 311.

[0047] The cold end 312 is connected with the terminal box 34, and the first wire 8 and the second wire 9 between the ceramic column 32 and the terminal box 34 are sleeved with a heat shrink tube.

[0048] Further, the outer wall of the ceramic column 32 is provided with a ceramic outer ring 7, which is integrally formed with the ceramic column 32.

[0049] Thermocouple 3 temperature measurement process:

[0050] In the design of the thermocouple 3, the temperature measurement process first relies on the direct contact of the hot end 311 of the hot electrode 31 with the object to be measured (such as the heating part of the furnace). When the hot end 311 (formed by welding the first wire 8 and the second wire 9) of the hot electrode 31 contacts the measured object, the temperature difference generated by the hot end 311 induces a thermoelectric effect, i.e. a temperature difference potential is formed between the hot end 311 and the cold end 312. The temperature difference generated by the hot end 311 will generate a corresponding voltage signal at the cold end 312, which is transmitted to the terminal box 34 through the cold end 312 and finally read by the measuring instrument. The wire hole 322 and the ceramic partition 10 in the ceramic column 32 stably guide and separate the wires of the hot electrode 31, ensuring the electrical isolation and stable connection of the hot end 311 and the cold end 312.

[0051] In addition, the surface of the metal sheet 33 is provided with a superconducting insulation layer 6, which further isolates the influence between the electrical signal and the heat source, improves the measurement accuracy, and prevents external electromagnetic interference. Since the outer wall of the ceramic column 32 is provided with a ceramic outer ring 7, this structure enhances the high temperature resistance and mechanical stability of the entire thermocouple 3.

Claims

1. A thermocouple comprising thermoelectrodes, a ceramic column, a metal sheet, and a junction box, characterized in that: The top of the ceramic column is open, and the inner cavity of the ceramic column has a wire hole to facilitate the passage of the thermoelectrode. The top opening and the wire hole are connected. The metal sheet is disposed at the top opening, and a superconducting insulating layer is disposed on the surface of the metal sheet; The hot end of the thermoelectrode passes through a wire hole and connects to a metal sheet, while the cold end of the thermoelectrode passes through a wire hole, extends out of the ceramic post, and connects to a junction box.

2. The thermocouple according to claim 1, characterized in that: The metal sheet is a planar metal sheet.

3. The thermocouple according to claim 1, characterized in that: The thermoelectric electrode includes a first wire and a second wire, one end of which is welded together to form the hot end, and the other end of the first wire is a cold end for connecting to the junction box, and the other end of the second wire is a cold end for connecting to the junction box.

4. The thermocouple according to claim 3, characterized in that: The wire hole is equipped with a ceramic partition, which divides the wire hole into a first wire hole and a second wire hole. A cavity is provided between the top opening of the ceramic column and the upper end of the wire hole. The first wire passes through the first wire hole, the upper end of the first wire is placed in the cavity, and the lower end of the first wire extends out of the ceramic column to form the cold end; The second wire passes through the second wire hole, with its upper end placed inside the cavity and its lower end extending out of the ceramic column to form the cold end. The bottom of the metal sheet is welded to the hot end; The cold end is connected to the junction box, and the first and second wires located between the ceramic post and the junction box are fitted with heat shrink tubing.

5. The thermocouple according to claim 1, characterized in that: The outer wall of the ceramic column is provided with a ceramic outer ring, and the ceramic outer ring and the ceramic column are integrally formed.

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