CN216282805U - Indirect temperature measurement system of ultra-high temperature vacuum sintering stove - Google Patents
Indirect temperature measurement system of ultra-high temperature vacuum sintering stove Download PDFInfo
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- CN216282805U CN216282805U CN202122886454.1U CN202122886454U CN216282805U CN 216282805 U CN216282805 U CN 216282805U CN 202122886454 U CN202122886454 U CN 202122886454U CN 216282805 U CN216282805 U CN 216282805U
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- thermocouple
- temperature measurement
- protective sleeve
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Abstract
The utility model discloses an indirect temperature measurement system of an ultrahigh-temperature vacuum sintering furnace, belonging to the technical field of vacuum sintering furnaces. The temperature measurement system comprises a carbon felt arranged in a sintering furnace, wherein a temperature measurement hole is formed in one side of the carbon felt, a protective sleeve is arranged in the temperature measurement hole, the protective sleeve is attached to the inner wall of the temperature measurement hole, a hollow cavity is formed in the protective sleeve, a thermocouple is inserted into the hollow cavity of the protective sleeve, one end of the thermocouple is inserted into the hollow cavity of the protective sleeve, a driving mechanism for driving the thermocouple to stretch into the protective sleeve is arranged at the other end of the thermocouple, and a gap is reserved between the periphery of the thermocouple and the inner wall of the protective sleeve. The utility model has the advantage of accurate temperature measurement.
Description
Technical Field
The utility model relates to the technical field of vacuum sintering furnaces, in particular to an indirect temperature measurement system of an ultrahigh-temperature vacuum sintering furnace.
Background
The pressureless sintering boron carbide ceramic is extremely sensitive to the sintering temperature due to the narrow sintering temperature range, and when the fluctuation of the sintering temperature exceeds 10-20 ℃, the overburning is easily generated, so that the whole furnace product is scrapped. Therefore, a high-stability temperature measurement system is extremely critical to boron carbide sintering.
At present, the vacuum sintering furnace generally adopts a low-temperature thermocouple for temperature measurement and a high-temperature infrared optical lens for temperature measurement to control the temperature of the kiln. Generally, when the firing temperature is higher than 1500 ℃, a common alumina bushing thermocouple temperature measuring device is difficult to be adequate, and a non-contact optical temperature measuring system is required to be used for temperature control. The infrared optical lens temperature measurement mainly comprises a temperature measurement tube, a light receiving sensor and a data processing system. The temperature calibration is mainly carried out by measuring the infrared band in the kiln. When volatile substances are generated in the furnace and enter the temperature measuring tube to form smoke-like substances, the accuracy of the optical temperature measuring system can be seriously influenced, the actual temperature is generally far higher than the display temperature, the product in the furnace is over-burnt, and the structural damage of the furnace due to high temperature can be even caused. In addition, the infrared optical temperature measurement system is easily interfered by the ambient temperature, the infrared temperature measurement can be drifted due to the fluctuation of the room temperature, and the temperature measurement accuracy is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an indirect temperature measurement system of an ultrahigh-temperature vacuum sintering furnace, which can measure temperature accurately.
In order to realize the purpose of the utility model, the indirect temperature measuring system of the ultra-high temperature vacuum sintering furnace adopts the following technical scheme:
the utility model provides an indirect temperature measurement system of ultra-high temperature vacuum sintering stove, is including setting up the charcoal felt in sintering stove inside, and charcoal felt one side is equipped with the temperature measurement hole, is equipped with the protective sheath in the temperature measurement hole, and the inner wall setting in protective sheath laminating temperature measurement hole, the inside cavity that is equipped with of protective sheath, the well cavity interpolation of protective sheath is equipped with the thermocouple, and the cavity intracavity of protective sheath is inserted to thermocouple one end, and the thermocouple other end is equipped with its actuating mechanism who stretches into in the protective sheath of drive, leave the clearance between thermocouple periphery and the protective sheath inner wall.
Preferably, the driving mechanism protects a rack arranged on the outer wall of the sintering furnace, the rack is provided with a driving cylinder, and a piston rod of the driving cylinder is connected with the thermocouple.
Preferably, the material of the protective sleeve is silicon carbide ceramic.
Preferably, the thermocouple is a tungsten-sheathed thermocouple. The utility model adopts a tungsten sleeve thermocouple for temperature test, the highest practical temperature is 1950 ℃, and the highest practical temperature of a common alumina sleeve thermocouple is only 1550 ℃; and the number of the first and second electrodes,
preferably, the distance between the temperature measuring end of the thermocouple and the inner wall of the hearth of the sintering furnace is 10 mm. In the utility model, the tungsten sleeve thermocouple is inserted into the carbon felt, the distance from the head of the thermocouple to the furnace is 10mm, and the temperature can be reduced to 1900 ℃ at the position because the heat insulation performance of the carbon felt is excellent. The tungsten sleeve thermocouple is arranged at the position, so that the working requirement of the tungsten sleeve thermocouple can be met.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model detects the temperature in the furnace by adopting an indirect temperature measuring mode based on the temperature measurement of the thermocouple.
2. According to the utility model, the silicon carbide ceramic protective sleeve is added in the carbon felt, because the tungsten sleeve thermocouple is composed of metal tungsten, tungsten can react with carbon in the carbon felt at high temperature to form tungsten carbide, so that the tungsten sleeve is expanded and cracked, and the tungsten sleeve is difficult to work normally; therefore, through setting up the protective sheath, on the one hand carborundum ceramic protective sheath service temperature reaches 2500 ℃, on the other hand it can effectively prevent carbon and tungsten sleeve pipe contact, extension thermocouple life.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 carbon felt, 2 gaps, 3 protective sleeves, 4 thermocouples, 5 driving cylinders and 6 frames.
Detailed Description
The present invention is further illustrated by the following detailed description, which is to be construed as merely illustrative and not limitative of the remainder of the disclosure, and modifications and variations such as those ordinarily skilled in the art are intended to be included within the scope of the present invention as defined in the appended claims.
As shown in fig. 1, an indirect temperature measurement system of an ultra-high temperature vacuum sintering furnace comprises a carbon felt 1 arranged inside the sintering furnace, wherein a temperature measurement hole is formed in one side of the carbon felt 1, a protection sleeve 3 is arranged in the temperature measurement hole, the protection sleeve 3 is made of silicon carbide ceramic, the protection sleeve 3 is arranged to be attached to the inner wall of the temperature measurement hole, a hollow cavity is formed inside the protection sleeve 3, a thermocouple 4 is inserted into the hollow cavity of the protection sleeve 3, the thermocouple 4 is a tungsten sleeve thermocouple 4, one end of the thermocouple 4 is inserted into the hollow cavity of the protection sleeve 3, the distance between the temperature measurement end of the thermocouple 4 and the inner wall of a hearth of the sintering furnace is 10mm, a driving mechanism for driving the thermocouple 4 to extend into the protection sleeve 3 is arranged at the other end of the thermocouple 4, and a gap 2 is reserved between the periphery of the thermocouple 4 and the inner wall of the protection sleeve 3; the driving mechanism protects a rack 6 arranged on the outer wall of the sintering furnace, the rack 6 is provided with a driving cylinder 5, and a piston rod of the driving cylinder 5 is connected with a thermocouple 4.
The specific working process and principle of the utility model are as follows: the basic principle of the thermocouple 4 in temperature measurement is that two material conductors with different components form a closed loop, when temperature gradients exist at two ends, current flows through the loop, and electromotive force, namely thermoelectric potential, exists between the two ends. A thermocouple 4 graduation meter is made according to the function relation of the thermoelectromotive force and the temperature, and the temperature in the furnace can be measured according to the electromotive forces at different temperatures. The thermocouple temperature measurement has the advantages of high temperature measurement precision, high sensitivity, strong stability and the like, is not interfered by the environmental temperature, and has strong reliability. Specifically, during work, the thermocouple 4 is controlled to extend into the protective sleeve 3 to measure temperature through the driving cylinder 5, and the service life of the thermocouple 4 is prolonged due to the gap 2 reserved between the protective sleeve 3 and the thermocouple 4; the utility model takes the temperature measurement of the thermocouple 4 as the basis and adopts an indirect temperature measurement mode to detect the temperature in the furnace.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. The utility model provides an indirect temperature measurement system of ultra-high temperature vacuum sintering stove which characterized in that: the temperature measurement device comprises a carbon felt arranged in a sintering furnace, wherein a temperature measurement hole is formed in one side of the carbon felt, a protective sleeve is arranged in the temperature measurement hole and is attached to the inner wall of the temperature measurement hole, a hollow cavity is formed in the protective sleeve, a thermocouple is inserted into the hollow cavity of the protective sleeve, one end of the thermocouple is inserted into the hollow cavity of the protective sleeve, a driving mechanism for driving the thermocouple to stretch into the protective sleeve is arranged at the other end of the thermocouple, and a gap is reserved between the periphery of the thermocouple and the inner wall of the protective sleeve.
2. The indirect temperature measurement system of the ultra-high temperature vacuum sintering furnace according to claim 1, characterized in that: the driving mechanism protects a rack arranged on the outer wall of the sintering furnace, the rack is provided with a driving cylinder, and a piston rod of the driving cylinder is connected with a thermocouple.
3. The indirect temperature measurement system of the ultra-high temperature vacuum sintering furnace according to claim 1, characterized in that: the protective sleeve is made of silicon carbide ceramic.
4. The indirect temperature measurement system of the ultra-high temperature vacuum sintering furnace according to claim 1, characterized in that: the thermocouple is a tungsten sleeve thermocouple.
5. The indirect temperature measurement system of the ultra-high temperature vacuum sintering furnace according to claim 1, characterized in that: the distance between the temperature measuring end of the thermocouple and the inner wall of the hearth of the sintering furnace is 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122886454.1U CN216282805U (en) | 2021-11-19 | 2021-11-19 | Indirect temperature measurement system of ultra-high temperature vacuum sintering stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122886454.1U CN216282805U (en) | 2021-11-19 | 2021-11-19 | Indirect temperature measurement system of ultra-high temperature vacuum sintering stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216282805U true CN216282805U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122886454.1U Active CN216282805U (en) | 2021-11-19 | 2021-11-19 | Indirect temperature measurement system of ultra-high temperature vacuum sintering stove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216282805U (en) |
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2021
- 2021-11-19 CN CN202122886454.1U patent/CN216282805U/en active Active
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