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A thermocouple protection sleeve and its manufacturing method

A technology of protective sleeve and manufacturing method, which is applied in the direction of thermometers that are directly sensitive to heat/magnetic elements, measuring heat, and using electrical devices, etc., which can solve the problems of affecting normal process operation, increasing maintenance costs, and high corundum brittleness, etc. problems, to achieve the effect of improving service life, reducing maintenance costs, and excellent high temperature resistance

Active Publication Date: 2016-09-21
中信钛业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical industry generally uses corundum sleeves or wear-resistant alloy sleeves in harsh environments, and has achieved good results. The requirements are relatively high, so choosing corundum protective sleeve is a relatively ideal solution, but due to the physical properties of corundum brittleness and impact resistance, it often breaks in practical applications, and the service life is short, generally only about 10 days. Increased maintenance costs, seriously affecting normal process operation

Method used

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  • A thermocouple protection sleeve and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 1 As shown, the thermocouple protection sleeve includes a white steel inner sleeve 3 with one end closed and a corundum outer sleeve 1, the corundum outer sleeve 1 is set on the white steel inner sleeve 3, the white steel inner sleeve 3 and the corundum outer sleeve 1 A titanium dioxide bonding layer 2 is filled between the outer casing 1, and the connecting section 101 at the rear of the corundum outer casing 1 is wound with an asbestos rope 5 and bonded with a connecting pipe 6, and the connecting section 101 of the corundum outer casing 1 is connected to the connecting pipe 6 have the same length, and the length is 100 mm to 150 mm. In this embodiment, the length is 100 mm as an example. The material of the connecting pipe 6 is white steel; the front end of the connecting pipe 6 is welded with a connecting flange 4, and the white steel The opening end of the inner casing 3 is welded with a wire head 7, the wall thickness of the white steel inner casing 3 ...

Embodiment 2

[0031] The structure of this thermocouple protection sleeve is with embodiment 1;

[0032] Its specific production steps are as follows:

[0033] (1), titanium dioxide and sodium silicate (Na 2 O nSiO 2 ) aqueous solution according to the mass-volume ratio of 2:1g / mL was mixed and stirred evenly to obtain a paste of titanium dioxide, and the concentration of the aqueous solution of sodium silicate was 210g / L;

[0034] (2) Take a corundum outer sleeve 1 and a white steel inner sleeve 3 that are the same length as the thermocouple core and have one end closed. The gap between the corundum outer sleeve 1 and the white steel inner sleeve 3 after insertion is 2mm. Pour the prepared titanium dioxide paste into the corundum outer sleeve 1 and fill it up to ensure that the air in the corundum outer sleeve 1 is completely discharged;

[0035] (3) After dipping the asbestos rope 5 in the titanium dioxide paste, wind the asbestos rope 5 dipped in the titanium dioxide paste on the conn...

Embodiment 3

[0039] The structure of this thermocouple protection sleeve is with embodiment 1;

[0040] Its specific production steps are as follows:

[0041] (1), titanium dioxide and sodium silicate (Na 2 O nSiO 2 ) aqueous solution according to the mass-volume ratio of 2:1g / mL was mixed and stirred evenly to obtain a paste of titanium dioxide, and the concentration of the aqueous solution of sodium silicate was 230 g / L;

[0042] (2) Take a corundum outer sleeve 1 and a white steel inner sleeve 3 that are the same length as the thermocouple core and have one end closed. The gap between the corundum outer sleeve 1 and the white steel inner sleeve 3 after insertion is 3mm. Pour the prepared titanium dioxide paste into the corundum outer sleeve 1 and fill it up to ensure that the air in the corundum outer sleeve 1 is completely discharged;

[0043](3) After dipping the asbestos rope 5 in the titanium dioxide paste, wind the asbestos rope 5 dipped in the titanium dioxide paste on the conn...

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Abstract

A thermocouple protection casing, including corundum outer casing, titanium dioxide bonding layer, white steel inner casing, connecting flange, asbestos rope, connecting pipe and wire head. The method is: (1), mix and stir the titanium dioxide and sodium silicate aqueous solution evenly to obtain a titanium dioxide paste; (2), pour the prepared titanium dioxide paste into the corundum outer tube and fill it; (3), put After the asbestos rope is dipped in the titanium dioxide paste, it is wound around the back of the corundum outer casing and inserted into the connecting pipe; (4) insert the white steel inner casing into the corundum outer casing filled with titanium dioxide paste, and drain the overflowing titanium dioxide (5) After standing at room temperature for 18h to 24h, weld the connecting flange to the front end of the connecting pipe, and weld the wire head to the open end of the white steel inner sleeve to make a thermocouple protection sleeve. The advantage is that the thermocouple protection sleeve is suitable for normal operation under high temperature, high pressure, corrosion and wear titanium dioxide production conditions, and can prolong the service life of the thermocouple protection sleeve.

Description

technical field [0001] The invention relates to a thermocouple protection casing and a manufacturing method thereof. Background technique [0002] Thermocouple is a kind of temperature detection element commonly used in industrial production. The accuracy and durability of thermocouple directly affect the normal operation of process equipment, and the protection sleeve is what ensures the normal operation of thermocouple. There are many types of thermocouple protection sleeves available, which are suitable for different working conditions. The chemical industry generally uses corundum sleeves or wear-resistant alloy sleeves in harsh environments, and has achieved good results. The requirements are high, so choosing corundum protective sleeve is a relatively ideal solution, but due to the physical properties of corundum brittleness and impact resistance, it often breaks in practical applications, and the service life is short, generally only about 10 days, increasing The ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/04
Inventor 赵玉泉刘向久李世东赵军
Owner 中信钛业股份有限公司
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