Glass-lined multipoint temperature measurement thermometer sleeve and preparation process thereof

Abstract

The invention discloses a glass-lined multipoint temperature measurement thermometer sleeve and a preparation process thereof, and relates to the technical field of glass-lined equipment, in particular to a glass-lined multipoint temperature measurement thermometer sleeve and a preparation process thereof. Comprising a thermometer sleeve body, a steel pipe is arranged in the thermometer sleeve body, a glass lining coating is arranged on the outer wall of the thermometer sleeve body, a thermal resistor is arranged at the top end of the thermometer sleeve body, a bottom temperature measuring probe is arranged at the bottom of the thermometer sleeve body, and a side wall temperature measuring probe is arranged on the side wall of the thermometer sleeve body. The thermal resistor comprises a thermal resistor I and a thermal resistor II, the thermal resistor I is electrically connected with the bottom temperature measuring probe, and the thermal resistor II is electrically connected with the side wall temperature measuring probe. According to the invention, the temperature measurement requirements of different height positions in the glass-lined equipment are met by using the single temperature measurement tube, and the temperature measurement tube has the positive effects of saving the top installation space of the glass-lined equipment, saving the equipment investment cost, remarkably improving the chemical stability and metal strength of the thermometer sleeve and prolonging the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of glass-lined equipment, and particularly to a glass-lined multi-point temperature measuring thermometer sleeve and a preparation process thereof. Background Art

[0002] Glass-lined equipment has the dual advantages of chemical stability similar to glass and metal strength, and is widely applicable to industrial fields such as chemical industry, medicine, petroleum, and food manufacturing. In the process production of glass-lined equipment, especially for glass-lined equipment with a large volume, it is crucial to monitor the temperature at different heights inside. Currently, the prior art usually sets multiple glass-lined thermometer sleeves to meet the temperature measurement requirements at different heights. Since the glass-lined thermometer sleeve generally has the function of a baffle, steel pipes with a thick diameter and a large wall thickness are required to meet the strength requirements of the pipe body, which makes the corresponding pipe orifice also large. If multiple glass-lined thermometer sleeves are set, multiple large-sized temperature measurement orifices are needed. The increase in large-sized temperature measurement orifices will inevitably lead to a reduction in the top space of the glass-lined equipment, and the number of orifices required for process feeding and discharging cannot be satisfied. In addition, the design method of multiple glass-lined thermometer sleeves will inevitably lead to an increase in the input cost of the equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a glass-lined multi-point temperature measuring thermometer sleeve and a preparation process thereof to solve the problems of large space occupation and high cost of traditional temperature measurement methods.

[0004] The glass-lined multi-point temperature measuring thermometer sleeve provided by the present invention includes a thermometer sleeve main body. A steel pipe is arranged inside the thermometer sleeve main body. A glass-lined coating is arranged on the outer wall of the thermometer sleeve main body. A thermal resistor is arranged at the top end of the thermometer sleeve main body. A bottom temperature measuring probe is arranged at the bottom of the thermometer sleeve main body through a bolt hole. A side wall temperature measuring probe is arranged on the side wall of the thermometer sleeve main body through a bolt hole. The thermal resistor includes a first thermal resistor and a second thermal resistor. The first thermal resistor is electrically connected to the bottom temperature measuring probe through an insulating and flame-retardant wire. The second thermal resistor is electrically connected to the side wall temperature measuring probe through an insulating and flame-retardant wire.

[0005] Further, a flange is arranged at the upper end of the thermometer sleeve main body, and a cover is arranged at the top end of the thermometer sleeve main body. An L-shaped connecting plate is arranged on the cover, and a thermal resistor is arranged on the connecting plate.

[0006] Further, a side wall additional temperature measuring probe is also arranged on the side wall of the thermometer sleeve main body. The thermal resistor further includes a third thermal resistor, and the third thermal resistor is electrically connected to the side wall additional temperature measuring probe through an insulating and flame-retardant wire.

[0007] Further, a rib plate is arranged on the flange, and a lifting hole is arranged on the rib plate.

[0008] Further, a sealing head is provided at the bottom of the thermometer sleeve body through tantalum nails; a guiding cone is provided at the upper end of the sealing head, and a bottom temperature measuring probe is provided at the lower end of the sealing head.

[0009] Further, an oval baffle is also provided on the thermometer sleeve body; the oval baffle is integrally formed with the thermometer sleeve body. A steel pipe is provided inside the oval baffle and the thermometer sleeve body, an enamel coating is provided on the outer wall of the oval baffle and the thermometer sleeve body, and a side wall temperature measuring probe and a side wall additional temperature measuring probe are provided on the oval baffle.

[0010] The preparation process of the enamel multi-point temperature measuring thermometer sleeve provided by the present invention includes the following steps: Step 1, according to the temperature measurement requirements during the reaction process of the enamel equipment, a plurality of bolt holes are provided at the bottom and side of the thermometer sleeve body blank. Step 2, after the thermometer sleeve body blank is made, the surface of the blank is subjected to sandblasting treatment. Step 3, after checking that the surface is free of damage, apply the bottom glaze. After the glaze powder is naturally dried, perform high-temperature firing. Step 4, after checking that the bottom glaze firing is okay, spray the surface glaze once. After natural drying, perform firing again. After checking that the fired surface glaze is okay, perform the surface glaze spraying and firing work 2 to 3 times to make the thermometer sleeve body and the enamel coating. Step 5, install the bottom temperature measuring probe and the side wall temperature measuring probe into the bolt holes of the thermometer sleeve body, and electrically connect the thermal resistor to the bottom temperature measuring probe and the side wall temperature measuring probe to meet the requirement of realizing multi-point temperature measurement with a single enamel thermometer sleeve.

[0011] Further, in Step 2, after the thermometer sleeve body blank is made, first perform a heat treatment to eliminate stress; then perform sandblasting treatment on the blank, and the roughness requirement of the sandblasting reaches Sa3 level.

[0012] Further, in Step 3, the high-temperature firing temperature of the bottom glaze is 890°C to 920°C, preferably 900°C, and the sintering duration is 2.5h to 4.0h, preferably 3h.

[0013] Further, in Step 4, the high-temperature firing temperature of the surface glaze is 800°C to 840°C, the sintering duration is 2.5h to 3.5h, preferably 3h; and after checking that the finished product of the thermometer sleeve body 1 is okay, perform fine grinding treatment on the enamel around the screw holes to meet the sealing requirements.

[0014] The enamel multi-point temperature measuring thermometer sleeve and its preparation process provided by the present invention have the following beneficial effects: 1. The bottom of the thermometer sleeve body of the present invention is provided with a bottom temperature measuring probe, and the side wall of the thermometer sleeve body is provided with a side wall temperature measuring probe, which can use a single temperature measuring tube to meet the temperature measuring requirements at different height positions in the glass-lined equipment. At the same time, it can save the top installation space of the glass-lined equipment. Compared with the case where multiple thermometer sleeves are required but a single one can meet the needs, the equipment input cost is greatly saved.

[0015] 2. The thermometer sleeve body of the present invention is provided with an oval baffle, and the side wall temperature measuring probe and the side wall additional temperature measuring probe are arranged on the oval baffle. The oval baffle can play a role in disturbing the flow and optimize the stirring effect.

[0016] 3. The outer wall of the thermometer sleeve body of the present invention is provided with a glass-lined coating. The glass-lined coating is fired with 1 time of base glaze and 1 time of high temperature, and 3 - 4 times of surface glaze and 3 - 4 times of high temperature firing, so that its corrosion resistance to 20% boiling hydrochloric acid for 168h, corrosion resistance to 0.1mol / L sodium hydroxide at 80°C for 24h, temperature difference sudden change resistance, mechanical impact resistance, and corrosion resistance to boiling water for 336h and other indicators are significantly higher than the requirements of relevant national standards, significantly improving the chemical stability and metal strength of the thermometer sleeve and enhancing its service life.

[0017] Therefore, the present invention can use a single temperature measuring tube to meet the temperature measuring requirements at different height positions in the glass-lined equipment, has the positive effects of saving the top installation space of the glass-lined equipment, saving the equipment input cost, and at the same time significantly improving the chemical stability and metal strength of the thermometer sleeve and enhancing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings partially disclose specific embodiments of the present invention, wherein, Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the thermometer sleeve body of the present invention; Figure 3 is of the present invention Figure 2 schematic structural diagram of part A in; Figure 4 is a schematic structural diagram of the L-shaped connecting plate and the thermal resistor of the present invention; Figure 5 is a quality inspection diagram of the glass-lined coating of the present invention; Reference numerals: 1. Thermometer sleeve body; 11. Bottom temperature measuring probe; 12. Side wall temperature measuring probe; 13. Side wall additional temperature measuring probe; 14. Steel pipe; 15. Guide cone; 16. Sealing head; 17. Oval baffle; 2. L-shaped connecting plate; 3. Thermal resistor; 31. Thermal resistor one; 32. Thermal resistor two; 33. Thermal resistor three; 34. Insulated and flame-retardant wire 4. Flange; 41. Rib plate; 42. Lifting hole 5. Cover Detailed implementation mode Embodiment 1:

[0019] As Figures 1-4 shown, the enamel multi-point temperature measurement thermometer sleeve provided by the present invention includes a thermometer sleeve main body 1. A steel pipe 14 is arranged inside the thermometer sleeve main body 1. An enamel coating is arranged on the outer wall of the thermometer sleeve main body 1. A thermal resistor 3 is arranged at the top end of the thermometer sleeve main body 1. A bottom temperature measurement probe 11 is arranged at the bottom of the thermometer sleeve main body 1 through a bolt hole. A side wall temperature measurement probe 12 is arranged on the side wall of the thermometer sleeve main body 1 through a bolt hole; the thermal resistor 3 includes a thermal resistor one 31 and a thermal resistor two 32. The thermal resistor one 31 is electrically connected to the bottom temperature measurement probe 11 through the insulated and flame-retardant wire 34, and the thermal resistor two 32 is electrically connected to the side wall temperature measurement probe 12 through the insulated and flame-retardant wire 34.

[0020] The present invention installs the thermometer sleeve main body 1 in an enamel equipment. The bottom temperature measurement probe 11 transmits the monitored temperature to the thermal resistor one 31, and the temperature at the bottom of the enamel equipment can be monitored; the side wall temperature measurement probe 12 transmits the monitored temperature to the thermal resistor two 32, and the temperature at different heights on the side wall of the enamel equipment can be monitored. The present invention can meet the temperature measurement requirements at different height positions in the enamel equipment by using a single thermometer sleeve main body 1, saving the installation space at the top of the enamel equipment. At the same time, compared with the need for multiple thermometer sleeves, when a single thermometer sleeve main body 1 can meet the requirements, the input cost of the enamel equipment is greatly saved.

[0021] As Figure 1 、 2 shown, a flange 4 is arranged at the upper end of the thermometer sleeve main body 1, and a cover 5 is arranged at the top end of the thermometer sleeve main body 1; an L-shaped connecting plate 2 is arranged on the cover 5, and a thermal resistor 3 is arranged on the connecting plate 2. The cover 5 is used to seal the upper end of the thermometer sleeve main body 1. The flange 4 facilitates the installation of the thermometer sleeve main body 1 on the enamel equipment. The thermal resistor 3 is fixed on the connecting plate 2 by bolts, and multiple thermal resistors 3 can be installed correspondingly according to the number of the side wall temperature measurement probe 12 and the side wall additional temperature measurement probe 13 to meet the temperature measurement requirements at different height positions in the enamel equipment with a single thermometer sleeve main body 1.

[0022] As Figure 1 、 4As shown, a sidewall additional temperature measurement probe 13 is also provided on the sidewall of the thermometer sleeve body 1; the thermal resistor 3 further includes a thermal resistor three 33, and the thermal resistor three 33 is electrically connected to the sidewall additional temperature measurement probe 13 through an insulating and flame-retardant wire 34. According to the temperature measurement requirements during the reaction process of the glass-lined equipment, the number of the sidewall additional temperature measurement probes 13 and the thermal resistors 3 can be reasonably increased. Usually, 1 to 3 sidewall additional temperature measurement probes 13 and thermal resistors 3 can be added to monitor the temperatures at different height positions in the glass-lined equipment.

[0023] As Figure 1 , 2 shown, a rib plate 41 is provided on the flange 4, and a lifting hole 42 is provided on the rib plate 41. The rib plate 41 and the lifting hole 42 facilitate the installation of the thermometer sleeve body 1 on the glass-lined equipment.

[0024] As Figure 3 shown, a sealing head 16 is provided at the bottom of the thermometer sleeve body 1 through tantalum nails; a guiding cone 15 is provided at the upper end of the sealing head 16, and a bottom temperature measurement probe 11 is provided at the lower end of the sealing head 16. The sealing head 16 is used to seal the bottom of the thermometer sleeve body 1. The guiding cone 15 facilitates the installation of the bottom temperature measurement probe 11 and is convenient for the bottom temperature measurement probe 11 to monitor the temperature at the bottom of the glass-lined equipment.

[0025] As Figure 1 , 2 shown, an oval baffle 17 is also provided on the thermometer sleeve body 1; the oval baffle 17 is integrally formed with the thermometer sleeve body 1 by machining. A steel pipe 14 is provided inside the oval baffle 17 and the thermometer sleeve body 1, and a glass-lined coating is provided on the outer walls of the oval baffle 17 and the thermometer sleeve body 1. A sidewall temperature measurement probe 12 and a sidewall additional temperature measurement probe 13 are provided on the oval baffle 17. Placing the oval baffle 17 inside the glass-lined can play a role in disturbing the flow and can optimize the stirring effect. Example two:

[0026] The preparation process of the glass-lined multi-point temperature measurement thermometer sleeve provided by the present invention includes the following steps: Step 1, according to the temperature measurement requirements during the reaction process of the glass-lined equipment, a plurality of bolt holes are provided at the bottom and side of the thermometer sleeve body 1 blank; Step 2, after the thermometer sleeve body 1 blank is made, the blank is subjected to surface sandblasting treatment; Step 3, after checking that the surface is not damaged, apply the bottom glaze. After the glaze powder is naturally dried, perform high-temperature firing; Step 4, after checking that the bottom glaze firing is okay, spray the top glaze once. After natural drying, perform firing again. After checking that the fired top glaze is okay, perform the top glaze powder spraying and firing work 2 to 3 times to make the thermometer sleeve body 1 and the glass-lined coating; Step 5, install the bottom temperature measuring probe 11 and the side wall temperature measuring probe 12 into the bolt holes of the thermometer sleeve body 1, and electrically connect the thermal resistor 3 to the bottom temperature measuring probe 11 and the side wall temperature measuring probe 12 to meet the requirement of multi-point temperature measurement with a single enamel thermometer sleeve. Embodiment 3:

[0027] The preparation process of the enamel multi-point temperature measuring thermometer sleeve provided by the present invention includes the following steps: Step 1, according to the temperature measurement requirements during the reaction of the enamel equipment, set a plurality of bolt holes at the bottom and side of the thermometer sleeve body 1 blank. One bolt hole can be set at the bottom of the thermometer sleeve body 1 blank for installing the bottom temperature measuring probe 11; 1 to 3 bolt holes are set on the side of the thermometer sleeve body 1 blank for installing the side wall temperature measuring probe 12 and the side wall additional temperature measuring probe 13; Step 2, after the thermometer sleeve body 1 blank is made, first perform a heat treatment to eliminate stress; then perform surface sandblasting on the blank, and the roughness requirement of the sandblasting reaches Sa3 level; Step 3, after checking that the surface is not damaged, spray the bottom glaze. After the glaze powder dries naturally, perform high-temperature firing. The high-temperature firing temperature is 890°C to 920°C, preferably 900°C, and the sintering duration is 2.5h to 4.0h, preferably 3h; Step 4, after checking that the bottom glaze firing is okay, spray the top glaze once. After natural drying, perform re-firing. The high-temperature firing temperature is 800°C to 840°C, and the sintering duration is 2.5h to 3.5h, preferably 3h; after checking that the top glaze firing is okay, perform the top glaze spraying and firing work 2 to 3 times. Each time the top glaze is sprayed and fired once, the high-temperature firing temperature is 800°C to 840°C, and the sintering duration is 2.5h to 3.5h, preferably 3h, to make the thermometer sleeve body 1 and the enamel coating; and after checking that the finished product of the thermometer sleeve body 1 is okay, perform fine grinding on the enamel around the screw holes to meet the sealing requirements; Step 5, install the bottom temperature measuring probe 11 and the side wall temperature measuring probe 12 into the bolt holes of the thermometer sleeve body 1, and electrically connect the thermal resistor 3 to the bottom temperature measuring probe 11 and the side wall temperature measuring probe 12 to meet the requirement of multi-point temperature measurement with a single enamel thermometer sleeve.

[0028] As Figure 5As shown, after 1 application of the base glaze and 1 high-temperature firing for the glass-lined coating of the present invention, followed by 3 to 4 applications of the top glaze and 3 to 4 high-temperature firings, with powder spraying and firing once for each application of the top glaze, the thermometer sleeve body 1 and the glass-lined coating are made. Through experimental testing, various indicators of the glass-lined coating, such as the corrosion resistance to 20% boiling hydrochloric acid for 168 hours, the corrosion resistance to 0.1 mol / L sodium hydroxide at 80°C for 24 hours, the resistance to rapid temperature change, the resistance to mechanical impact, and the corrosion resistance to boiling water for 336 hours, meet the requirements of GB / T 25025-2010 "Technical Conditions for Glass-Lined Equipment", and the product quality is significantly higher than the requirements of relevant national standards, significantly improving the chemical stability and metal strength of the thermometer sleeve and enhancing its service life. Example 4:

[0029] For the preparation process of the glass-lined multi-point temperature-measuring thermometer sleeve provided by the present invention, in step 3, after checking that the surface is free of damage, apply the base glaze. After the glaze powder dries naturally, conduct high-temperature firing. The high-temperature firing temperature is 910°C, and the sintering duration is 2.9 h. In step 4, after checking that the base glaze firing is problem-free, apply 1 layer of the top glaze. After natural drying, conduct firing again. The high-temperature firing temperature is 810°C, and the sintering duration is 3.4 h. After checking that the firing of the top glaze is problem-free, conduct the powder spraying and firing operations of the top glaze 2 to 3 more times. The high-temperature firing temperature is 810°C, and the sintering duration is 3.3 h to make the thermometer sleeve body 1 and the glass-lined coating; and after checking that the finished product of the thermometer sleeve body 1 is problem-free, conduct fine grinding of the enamel around the screw hole to meet the sealing requirements. At the same time, through experimental testing, various indicators of the glass-lined coating, such as the corrosion resistance to 20% boiling hydrochloric acid for 168 hours, the corrosion resistance to 0.1 mol / L sodium hydroxide at 80°C for 24 hours, the resistance to rapid temperature change, the resistance to mechanical impact, and the corrosion resistance to boiling water for 336 hours, meet the requirements of GB / T 25025-2010 "Technical Conditions for Glass-Lined Equipment", and the product quality is significantly higher than the requirements of relevant national standards, significantly improving the chemical stability and metal strength of the thermometer sleeve and enhancing its service life. Example 5:

[0030] For the preparation process of the glass-lined multi-point temperature-measuring thermometer sleeve provided by the present invention, in step 3, after checking that the surface is free of damage, apply the base glaze. After the glaze powder dries naturally, conduct high-temperature firing. The high-temperature firing temperature is 900°C, and the sintering duration is 3.0 h. Step 4: After the underglaze firing is inspected and found to be problem-free, apply the topcoat once. After natural drying, conduct firing again. The high-temperature firing temperature is 820 °C, and the sintering duration is 3.0 h. After the fired topcoat is inspected and found to be problem-free, conduct the topcoat powder spraying and firing work 2 to 3 times. The high-temperature firing temperature is 830 °C, and the sintering duration is 2.9 h to produce the thermometer sleeve body 1 and the glass-lined coating. After the finished product of the thermometer sleeve body 1 is inspected and found to be problem-free, conduct fine grinding of the enamel around the screw holes to meet the sealing requirements. At the same time, through experimental testing, various indicators such as the corrosion resistance of the glass-lined coating to 20% boiling hydrochloric acid for 168 h, the corrosion resistance to 0.1 mol / L sodium hydroxide at 80 °C for 24 h, the resistance to rapid temperature change, the resistance to mechanical shock, and the corrosion resistance to boiling water for 336 h meet the requirements of GB / T 25025-2010 "Technical Conditions for Glass-Lined Equipment", and the product quality is significantly higher than the requirements of relevant national standards, significantly improving the chemical stability and metal strength of the thermometer sleeve and enhancing its service life. Example 6:

[0031] For the preparation process of the glass-lined multi-point temperature-measuring thermometer sleeve provided by the present invention, in step 4, after the underglaze firing is inspected and found to be problem-free, apply the topcoat once. After natural drying, conduct firing again. The high-temperature firing temperature is 800 °C to 840 °C, and the sintering duration is 3 h. After natural drying, after the fired topcoat is inspected and found to be problem-free, conduct the second topcoat powder spraying and firing work. The high-temperature firing temperature is 800 °C to 840 °C, and the sintering duration is 3 h. After natural drying, after the fired topcoat is inspected and found to be problem-free, conduct the third topcoat powder spraying and firing work. The high-temperature firing temperature is 800 °C to 840 °C, and the sintering duration is 3 h. Apply the topcoat powder spraying and firing once each time to produce the thermometer sleeve body 1 and the glass-lined coating. After the finished product of the thermometer sleeve body 1 is inspected and found to be problem-free, conduct fine grinding of the enamel around the screw holes to meet the sealing requirements. At the same time, through experimental testing, various indicators such as the corrosion resistance of the glass-lined coating to 20% boiling hydrochloric acid for 168 h, the corrosion resistance to 0.1 mol / L sodium hydroxide at 80 °C for 24 h, the resistance to rapid temperature change, the resistance to mechanical shock, and the corrosion resistance to boiling water for 336 h meet the requirements of GB / T 25025-2010 "Technical Conditions for Glass-Lined Equipment", and the product quality is significantly higher than the requirements of relevant national standards, significantly improving the chemical stability and metal strength of the thermometer sleeve and enhancing its service life.

Claims

1. Glass-lined multi-point temperature measuring thermometer sleeve, including the thermometer sleeve body (1), characterized in that, A steel pipe (14) is provided inside the thermometer sleeve body (1). The outer wall of the thermometer sleeve body (1) is provided with a glass-lined coating. A thermal resistor (3) is provided at the top end of the thermometer sleeve body (1). A bottom temperature measuring probe (11) is provided at the bottom of the thermometer sleeve body (1) through a bolt hole. A side wall temperature measuring probe (12) is provided on the side wall of the thermometer sleeve body (1) through a bolt hole; the thermal resistor (3) includes a first thermal resistor (31) and a second thermal resistor (32). The first thermal resistor (31) is electrically connected to the bottom temperature measuring probe (11) through an insulating and flame-retardant wire (34). The second thermal resistor (32) is electrically connected to the side wall temperature measuring probe (12) through an insulating and flame-retardant wire (34).

2. The enamel multi-point temperature measuring thermometer sleeve according to claim 1, wherein, A flange (4) is provided at the upper end of the thermometer sleeve body (1). A sealing cover (5) is provided at the top end of the thermometer sleeve body (1); an L-shaped connecting plate (2) is provided on the sealing cover (5), and a thermal resistor (3) is provided on the connecting plate (2).

3. The enameled multi-point temperature measuring thermometer sleeve according to claim 1, characterized in that, A side wall additional temperature measuring probe (13) is further provided on the side wall of the thermometer sleeve body (1); the thermal resistor (3) further includes a third thermal resistor (33). The third thermal resistor (33) is electrically connected to the side wall additional temperature measuring probe (13) through an insulating and flame-retardant wire (34).

4. The enameled multi-point temperature measuring thermometer sleeve according to claim 1, characterized in that, A rib plate (41) is provided on the flange (4), and a lifting hole (42) is provided on the rib plate (41).

5. The enameled multi-point temperature measuring thermometer sleeve according to claim 1, characterized in that, A sealing pipe head (16) is provided at the bottom of the thermometer sleeve body (1) through tantalum nails; a guiding cone (15) is provided at the upper end of the sealing pipe head (16), and a bottom temperature measuring probe (11) is provided at the lower end of the sealing pipe head (16).

6. The enameled multi-point temperature measuring thermometer sleeve according to claim 1, characterized in that An oval baffle (17) is further provided on the thermometer sleeve body (1); the oval baffle (17) is integrally formed with the thermometer sleeve body (1) by machining. A steel pipe (14) is provided inside the oval baffle (17) and the thermometer sleeve body (1). The outer walls of the oval baffle (17) and the thermometer sleeve body (1) are provided with a glass-lined coating. A side wall temperature measuring probe (12) and a side wall additional temperature measuring probe (13) are provided on the oval baffle (17).

7. Preparation process of enamel multi-point temperature measuring thermometer sleeve, characterized in that It includes the following steps: Step 1, according to the temperature measurement requirements during the reaction process of the glass-lined equipment, a plurality of bolt holes are provided at the bottom and side of the blank of the thermometer sleeve body (1). Step 2, after the blank of the thermometer sleeve body (1) is made, the surface of the blank is subjected to sandblasting treatment. Step 3, after checking that the surface is not damaged, apply a bottom glaze. After the glaze powder is naturally dried, perform high-temperature firing. Step 4, when the firing of the bottom glaze is checked to be problem-free, spray the surface glaze once. After natural drying, perform firing again. When the firing of the surface glaze is checked to be problem-free, perform the spraying and firing operations of the surface glaze powder 2 to 3 times to make the thermometer sleeve body (1) and the glass-lined coating. Step 5, install the bottom temperature measuring probe (11) and the side wall temperature measuring probe (12) into the bolt holes of the thermometer sleeve body (1), and electrically connect the thermal resistor (3) to the bottom temperature measuring probe (11) and the side wall temperature measuring probe (12) to meet the requirement of multi-point temperature measurement by a single glass-lined thermometer sleeve.

8. The preparation process of the enamel multi-point temperature measuring thermometer sleeve according to claim 7, characterized in that, In Step 2, after the blank of the thermometer sleeve body (1) is fabricated, a heat treatment is first carried out to eliminate stress; then the blank is subjected to surface sandblasting, and the roughness requirement of the sandblasting reaches Sa3 level.

9. The preparation process of the enamel multi-point temperature measuring thermometer sleeve according to claim 7, characterized in that, In Step 3, the high-temperature firing temperature of the base glaze is 890°C to 920°C, preferably 900°C, and the sintering duration is 2.5 h to 4.0 h, preferably 3 h.

10. The preparation process of the enamel multi-point temperature measuring thermometer sleeve according to claim 7, characterized in that, In Step 4, the high-temperature firing temperature of the top glaze is 800°C to 840°C, and the sintering duration is 2.5 h to 3.5 h, preferably 3 h; and after the finished product of the thermometer sleeve body (1) is inspected without problems, fine grinding treatment is carried out on the enamel around the screw hole to meet the sealing requirements.

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