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Copper-constantan thermocouple and preparation method thereof

A technology of thermocouple and constantan, which is applied in the direction of directly heat-sensitive electric/magnetic element thermometers, measuring heat, and using electric devices, etc. It can solve the problems of difficult preparation technology, inability to use preparation methods, and broken soldering.

Inactive Publication Date: 2014-12-10
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the metal wire with a diameter of less than 0.2mm is prone to virtual welding, broken welding, and the welding point is not easy to form a spherical shape during welding, this ultra-fine copper-constantan thermocouple cannot use the common commercial thermocouple preparation method in terms of welding parameters. , its preparation technology is difficult

Method used

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  • Copper-constantan thermocouple and preparation method thereof

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Embodiment 1

[0030] This embodiment discloses a copper-constantan thermocouple, which includes a thermal electrode welded by a copper wire conductor and a constantan wire conductor; the diameter of the copper wire conductor is 0.04mm to 0.2mm; the constantan wire The diameter of the conductor is 0.04 mm to 0.2 mm. Moreover, the external diameter of the test end of the thermocouple disclosed in this embodiment is less than 1mm. It can meet certain specific purposes, such as temperature test of tiny sample chamber, transient test of rapid temperature rise, etc. to complete accurate measurement.

Embodiment 2

[0032] Such as figure 1 As shown, according to another embodiment of the present invention, this embodiment discloses a method for preparing a copper-constantan thermocouple, the main equipment used in this embodiment is DC arc welding equipment, such as figure 1 As shown, it mainly includes a device body, which is provided with a rectifier 3 and a pressure regulating handle 4, and a switch 5 is provided on the device body for starting and closing the device. It is preferred that the welding rod in this device adopts carbon rod 1, Weldment 2 is composed of copper wire and constantan wire. Wherein the diameter of the copper wire conductor is 0.04mm to 0.2mm; the diameter of the constantan wire conductor is 0.04mm to 0.2mm. Preferably, the contact end between the carbon rod and the weldment is provided with a tip structure. Specifically, it can be prepared by using the carbon rod in the waste No. 1 battery and grinding it into the shape of a pencil head.

[0033] In the prepa...

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Abstract

The invention discloses a copper-constantan thermocouple and a preparation method thereof. The preparation method includes the steps: A, selecting direct-current arc welding equipment; B, selecting a copper wire and a constantan wire, removing insulating layers at welding ends of the copper wire and the constantan wire, and twin twisting a copper wire welding portion and a constantan wire welding portion; C, connecting the welding ends to an output end of a transformer; contacting a carbon rod tip structure with the twin twisted copper wire and constantan wire welding portion; welding two electrodes of a twin twisted thermocouple by electric arc generated by point discharge; D, judging welding quality after welding; E, selecting an insulating guide tube, penetrating the copper wire and the constantan wire into the insulating guide tube, exposing a welding spot outside the insulating guide tube to serve as a test end, grinding the other ends of the copper wire and the constantan wire to remove the insulating layers, welding to a wiring card and fastening. The preparation method of the copper-constantan thermocouple is available for metal wires with diameters ranging from 0.04mm to 0.2mm, and the outer diameter of the test end of the thermocouple is smaller than 1mm.

Description

technical field [0001] The invention relates to the technical field of temperature sensors, in particular to a copper-constantan thermocouple and a preparation method thereof. Background technique [0002] Thermocouple is a commonly used temperature measuring element in temperature measuring instruments. It directly measures the temperature, and converts the temperature signal into a thermal electromotive force signal, and converts it into the temperature of the measured medium through an electrical instrument (secondary instrument). The shapes of various thermocouples are often very different due to needs, but their basic structures are roughly the same, usually composed of main parts such as thermal electrodes, insulating sleeve protection tubes, and junction boxes, and are usually associated with display instruments, recording instruments, and electronic regulators. used together with the device. [0003] A thermocouple is a temperature sensor prepared by melting and wel...

Claims

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Application Information

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IPC IPC(8): G01K7/04
Inventor 沈明温茂萍陈红霞刘更
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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