A tungsten-rhenium thermocouple and quartz preparation system for temperature measurement in quartz preparation

Abstract

This utility model discloses a tungsten-rhenium thermocouple and a quartz preparation system for temperature measurement during quartz preparation. The tungsten-rhenium thermocouple for temperature measurement during quartz preparation includes a flange and a tungsten thermocouple sheath fixed to one side of the flange. The tungsten thermocouple sheath is fitted with a zirconia sheath and a graphite sheath from the inside out. The zirconia sheath completely encloses the end of the tungsten thermocouple sheath within the cavity formed between it and the flange. Both the ends of the zirconia and graphite sheaths are sealed to the flange. The tungsten-rhenium thermocouple for temperature measurement during quartz preparation proposed in this utility model uses isostatically pressed graphite as the first outer sheath to prevent impurity deposits, and uses zirconia as the second inner sheath to prevent carbon elements from contacting the tungsten sheath, thus delaying the cracking time of the tungsten sheath and extending the service life of the tungsten-rhenium thermocouple. Simultaneously, the graphite outer sheath and the zirconia inner sheath have high thermal conductivity and do not affect the accuracy of furnace temperature detection.

Description

Technical Field

[0001] This utility model relates to the field of quartz glass manufacturing equipment technology, and in particular to a tungsten-rhenium thermocouple and a quartz preparation system for temperature measurement during quartz preparation. Background Technology

[0002] The preparation of quartz requires the use of a high-temperature graphite furnace. However, the graphite heating element and graphite insulation layer are prone to volatilizing impurities at high temperatures. Therefore, under such carbon atmosphere conditions, the lifespan of the tungsten-rhenium thermocouple used for temperature measurement is short. The main reason is that traditional tungsten-rhenium thermocouples use metallic molybdenum and metallic tungsten as sheaths. At high temperatures, these materials react with carbon to form brittle carbides. After the carbides fall off, they cause the sheaths to crack, which in turn affects the temperature measurement and lifespan of the tungsten-rhenium thermocouple wire. Utility Model Content

[0003] The main purpose of this invention is to provide a tungsten-rhenium thermocouple and a quartz preparation system for temperature measurement in quartz preparation, aiming to improve the service life of the tungsten-rhenium thermocouple wire while ensuring its temperature measurement accuracy.

[0004] To achieve the above objectives, this utility model provides a tungsten-rhenium thermocouple for quartz preparation temperature measurement, comprising a flange and a tungsten thermocouple sheath fixed to one side of the flange. The tungsten thermocouple sheath is characterized by having a zirconia sheath and a graphite sheath respectively fitted around its outer surface from the inside out. The zirconia sheath completely encloses the end of the tungsten thermocouple sheath within the cavity formed by the zirconia sheath and the flange. The ends of both the zirconia sheath and the graphite sheath are sealed to the flange.

[0005] Preferably, the zirconia sleeve and the graphite sleeve are connected to the flange by threads.

[0006] Preferably, the flange has a protruding fixing seat on the side near the zirconia sheath, and the outer wall of the fixing seat is provided with external threads for connection with the graphite sheath. The fixing seat has a groove inside, and the zirconia sheath is accommodated inside the groove and threadedly connected to the side wall of the groove.

[0007] Preferably, the thickness of the zirconium oxide sheath is 2mm to 3mm.

[0008] Preferably, the thickness of the graphite sheath is 2mm to 3mm.

[0009] Preferably, a gap is provided between the zirconium oxide sheath and the graphite sheath.

[0010] Preferably, the thickness of the gap between the zirconium oxide sheath and the graphite sheath is 0.5 mm to 1.5 mm.

[0011] Preferably, both the zirconium oxide sheath and the graphite sheath are U-shaped sheaths.

[0012] Preferably, the thermocouple tungsten sleeve is fixedly connected to the flange by brazing.

[0013] This utility model also proposes a quartz preparation system, including a graphite high-temperature furnace, inside which is installed the aforementioned tungsten-rhenium thermocouple used for temperature measurement during quartz preparation.

[0014] The tungsten-rhenium thermocouple for temperature measurement in quartz preparation proposed in this invention has the following beneficial effects: 1. By setting a zirconium oxide sheath and a graphite sheath on the outside of the thermocouple tungsten sheath, the reaction between the thermocouple tungsten sheath and the carbon inside the graphite high-temperature furnace is avoided to produce brittle carbides, and the sheath cracking caused by the carbides falling off is avoided, thus greatly improving the service life of the tungsten rhenium thermocouple. 2. Because the zirconia sheath and graphite sheath are used to protect the tungsten tube of the thermocouple, the first outer sheath is made of isostatic graphite to block impurities and deposits, and the second inner sheath is made of zirconia to block carbon elements from contacting the tungsten tube, thus delaying the cracking time of the tungsten tube and extending the service life of the tungsten-rhenium thermocouple. At the same time, the graphite outer sheath and the zirconia inner sheath have strong thermal conductivity and do not affect the accuracy of furnace temperature detection. 3. This tungsten-rhenium thermocouple has the advantages of simple structure and low modification cost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a preferred embodiment of the tungsten-rhenium thermocouple for quartz preparation and temperature measurement according to the present invention.

[0016] In the diagram, 1-flange, 11-external thread, 12-internal thread, 13-copper brazing, 2-thermocouple tungsten sleeve, 3-zirconia sheath, 4-graphite sheath.

[0017] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] It should be noted that in the description of this utility model, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] This invention proposes a tungsten-rhenium thermocouple for temperature measurement in quartz preparation.

[0021] Reference Figure 1 In this preferred embodiment, a tungsten-rhenium thermocouple for quartz preparation temperature measurement includes a flange 1 and a thermocouple tungsten sheath 2 fixed to one side of the flange 1. The thermocouple tungsten sheath 2 is covered with a zirconia sheath 3 and a graphite sheath 4 from the inside to the outside. The zirconia sheath 3 completely wraps the end of the thermocouple tungsten sheath 2 inside the cavity formed by the zirconia sheath 3 and the flange 1. The ends of the zirconia sheath 3 and the graphite sheath 4 are both sealed to the flange 1.

[0022] In this embodiment, the zirconia sleeve 3 and the graphite sleeve 4 are threadedly connected to the flange 1. Specifically, the flange 1 has a protruding fixing seat on the side near the zirconia sleeve 3. The outer wall of the fixing seat has an external thread 11 for connection with the graphite sleeve 4. The fixing seat has a groove inside, and the zirconia sleeve 3 is accommodated inside the groove and threadedly connected to the side wall of the groove. The groove has a mounting hole, and the thermocouple tungsten sleeve 2 is inserted into the mounting hole. The thermocouple tungsten sleeve 2 is fixedly connected to the flange 1 by brazing.

[0023] In this embodiment, the thickness of the zirconia sheath 3 is 2mm to 3mm. The thickness of the graphite sheath 4 is 2mm to 3mm. Further, a gap is provided between the zirconia sheath 3 and the graphite sheath 4. The thickness of the gap between the zirconia sheath 3 and the graphite sheath 4 is 0.5mm to 1.5mm.

[0024] Specifically, both the zirconium oxide sheath 3 and the graphite sheath 4 are U-shaped sheaths.

[0025] The manufacturing process of the tungsten-rhenium thermocouple used for quartz temperature measurement is as follows: First, a zirconia sheath 3 is fitted onto the outside of the tungsten sheath 2 of the thermocouple. The zirconia sheath 3 is rotated so that the thread at its end engages with the thread 12 inside the groove of the flange 1 to fix the zirconia sheath 3. Then, a graphite sheath 4 is fitted onto the outside of the zirconia sheath 3. The graphite sheath 4 is rotated so that it engages with the external thread 11 of the flange 1 fixing seat to tighten the graphite sheath 4.

[0026] The tungsten-rhenium thermocouple for quartz preparation temperature measurement proposed in this embodiment has the following beneficial effects: 1. By setting a zirconium oxide sheath 3 and a graphite sheath 4 on the outside of the thermocouple tungsten sheath 2, the brittle carbide is prevented from being produced by the reaction between the thermocouple tungsten sheath 2 and the carbon inside the graphite high-temperature furnace. This avoids the sheath cracking caused by the carbide falling off, thereby greatly improving the service life of the tungsten rhenium thermocouple. 2. Because the zirconia sheath 3 and the graphite sheath 4 are set to protect the tungsten sheath of the thermocouple 2, the first outer sheath is made of isostatic graphite to block impurities and deposits, and the second inner sheath is made of zirconia material to block carbon elements from contacting the tungsten sheath, thus delaying the cracking time of the tungsten sheath and extending the service life of the tungsten-rhenium thermocouple. At the same time, the graphite outer sheath and the zirconia inner sheath have strong thermal conductivity and do not affect the accuracy of furnace temperature detection. 3. This tungsten-rhenium thermocouple has the advantages of simple structure and low modification cost.

[0027] This invention proposes a quartz preparation system.

[0028] In this preferred embodiment, a quartz preparation system includes a graphite high-temperature furnace, inside which a tungsten-rhenium thermocouple for temperature measurement during quartz preparation is installed. The specific structure and beneficial effects of the tungsten-rhenium thermocouple are as described in the above embodiments and will not be repeated here.

[0029] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A tungsten-rhenium thermocouple for temperature measurement in quartz preparation, comprising a flange and a tungsten thermocouple sheath fixed to one side of the flange, characterized in that, The thermocouple tungsten sheath is fitted with a zirconia sheath and a graphite sheath from the inside out. The zirconia sheath completely encloses the end of the thermocouple tungsten sheath within the cavity formed by the zirconia sheath and the flange. The ends of both the zirconia sheath and the graphite sheath are sealed to the flange.

2. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in claim 1, characterized in that, The zirconia sleeve and graphite sleeve are connected to the flange by threads.

3. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in claim 1, characterized in that, The flange has a protruding fixing seat on the side near the zirconia sheath. The outer wall of the fixing seat has external threads for connection with the graphite sheath. The fixing seat has a groove inside, and the zirconia sheath is accommodated inside the groove and threadedly connected to the side wall of the groove.

4. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in claim 1, characterized in that, The thickness of the zirconia sheath is 2mm to 3mm.

5. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in claim 1, characterized in that, The thickness of the graphite sheath is 2mm to 3mm.

6. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in claim 1, characterized in that, A gap is provided between the zirconium oxide sheath and the graphite sheath.

7. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in claim 6, characterized in that, The thickness of the gap between the zirconium oxide sheath and the graphite sheath is 0.5mm to 1.5mm.

8. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in claim 1, characterized in that, Both the zirconium oxide sheath and the graphite sheath are U-shaped sheaths.

9. The tungsten-rhenium thermocouple for quartz preparation temperature measurement as described in any one of claims 1 to 8, characterized in that, The thermocouple tungsten sleeve is fixedly connected to the flange by copper welding.

10. A quartz preparation system, characterized in that, It includes a graphite high-temperature furnace, inside which is installed a tungsten-rhenium thermocouple for temperature measurement in quartz preparation as described in any one of claims 1 to 9.

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