CN218709906U - Gradient furnace for optical glass experiments - Google Patents
Gradient furnace for optical glass experiments Download PDFInfo
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- CN218709906U CN218709906U CN202223537477.2U CN202223537477U CN218709906U CN 218709906 U CN218709906 U CN 218709906U CN 202223537477 U CN202223537477 U CN 202223537477U CN 218709906 U CN218709906 U CN 218709906U
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- thermocouple
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The utility model discloses a gradient furnace for optical glass experiments, which comprises a furnace body, a first heating system, a second heating system, a temperature monitoring system and a sample chamber, wherein the first heating system consists of a first heating element and a first thermocouple and is arranged in a high-temperature area of the furnace body; the second heating system consists of a second heating element and a second thermocouple and is arranged in a low-temperature area of the furnace body; the temperature monitoring system consists of a plurality of thermocouple arrays and is arranged between the first thermocouple and the second thermocouple; the sample chamber is arranged in the furnace body and below the first thermocouple, the second thermocouple and the temperature monitoring system. The utility model provides a but gradient furnace for optical glass experiments truly simulates the devitrification condition of glass liquid in the cooling process, and accurate measurement glass devitrification upper limit temperature to melting process control for optical glass provides accurate foundation.
Description
Technical Field
The utility model belongs to the technical field of the glass test, concretely relates to gradient furnace for optical glass experiments.
Background
The melting process of the optical glass comprises 5 stages of melting, heating, clarifying, cooling and stirring, wherein the lower welding temperature (thermocouple is directly welded on platinum and can be similar to the temperature of glass liquid) of a stirring tank is closely related to the upper crystallization temperature (the initial crystallization temperature of the glass liquid in the cooling process) of the glass, and the accurate measurement of the upper crystallization temperature of the glass is crucial to the process control of the production process. DSC is mostly used in colleges and universities for measuring the crystallization range of glass, and although the DSC method is accurate, the DSC method is relatively low in practicability for optical glass manufacturing enterprises due to the fact that instruments are expensive and the using cost is high, and most enterprises adopt a gradient furnace for measuring the crystallization range of glass.
The working principle of the gradient furnace is that the control temperature of a high-temperature section is set firstly, and a temperature gradient is formed in a sample chamber through high-temperature radiation. In addition, chinese patent CN208172001U discloses a glass crystallization test device, which forms a temperature gradient by the density of the coil. Although both the two gradient furnaces can form temperature gradients, in the heat preservation stage, due to high-temperature radiation, each temperature point of the low-temperature section is gradually increased, and particularly when the upper limit temperature of glass crystallization is measured, the temperature of the low-temperature section is increased by about 200 ℃, the crystallization condition of glass liquid in the cooling process is difficult to simulate really, the measurement result is often high, and the process control in the production process is extremely unfavorable.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects of the prior art, and providing the gradient furnace for optical glass experiments, which can truly simulate the devitrification condition of glass liquid in the cooling process and accurately measure the devitrification upper limit temperature of glass.
In order to achieve the purpose, the technical scheme is as follows:
a gradient furnace for optical glass experiments comprises a furnace body, a first heating system, a second heating system, a temperature monitoring system and a sample chamber, wherein the first heating system consists of a first heating element and a first thermocouple and is arranged in a high-temperature area of the furnace body; the second heating system consists of a second heating element and a second thermocouple and is arranged in a low-temperature area of the furnace body; the temperature monitoring system consists of a plurality of thermocouple arrays and is arranged between the first thermocouple and the second thermocouple; the sample chamber is arranged in the furnace body and below the first thermocouple, the second thermocouple and the temperature monitoring system. Firstly, setting the control temperatures of the first heating system and the second heating system to be consistent, and after the temperature of the furnace body is balanced, putting a sample into a sample chamber; after the temperature is kept for a period of time (the temperature keeping time is determined according to the glass formula), the second heating system is closed to reduce the temperature of the low-temperature area, and a temperature gradient in the sample chamber is formed through the first heating system, so that the crystallization condition of the glass liquid in the cooling process is truly simulated, and the glass crystallization upper limit temperature can be accurately measured.
As another preferable scheme of the utility model, the first heating element is formed by connecting 4 groups of U-shaped silicon-molybdenum rods in series.
As another preferred embodiment of the present invention, the first thermocouple is disposed inside the first heating element to more accurately control the temperature of the high temperature zone of the furnace body.
As another preferable scheme of the present invention, the second heating element is formed by connecting 8 groups of U-shaped silicon-molybdenum rods in series.
As another preferred scheme of the utility model, the second thermocouple sets up in the low temperature district outside of being close to of second heating element, guarantees that the initial temperature in low temperature district is the same with the high temperature district.
As another preferred scheme of the utility model, temperature monitoring system comprises 6 thermocouples, and is equal with first thermocouple, second thermocouple distance, can evenly monitor the inside temperature of sample room.
Compared with the prior art, the utility model provides a gradient furnace for optical glass experiments has following gain effect:
the gradient furnace for the optical glass experiment provided by the embodiment is heated to the set control temperature through the first heating system and the second heating system, then the second heating system is closed to reduce the temperature of the low-temperature region, the first heating system continues to work to form the temperature gradient in the sample chamber, the crystallization condition of glass liquid in the cooling process is simulated really, the upper limit temperature of glass crystallization can be measured accurately, and therefore an accurate basis is provided for the control of the melting process of the optical glass.
Drawings
Fig. 1 is the schematic structural view of the present invention, fig. 2 is the top view of the present invention, fig. 3 is the side view of the present invention, and fig. 4 is the front view of the present invention.
Wherein: 1-furnace body; 21-a first heating element; 22-a first thermocouple; 31-a second heating element; 32-a second thermocouple; 4-a temperature monitoring system; 5-sample chamber.
Detailed Description
For a better understanding of the present invention, the following detailed description of the embodiments of the present invention is described in conjunction with the accompanying drawings.
As shown in fig. 1-4, a gradient furnace for optical glass experiments comprises a furnace body 1, a first heating system, a second heating system, a temperature monitoring system 4 and a sample chamber 5, wherein the first heating system is composed of a first heating element 21 and a first thermocouple 22 and is arranged in a high-temperature area of the furnace body 1, the first heating element 21 is formed by connecting 4 groups of U-shaped silicon-molybdenum rods in series, and the first thermocouple 22 is arranged at the inner side of the first heating element 21 so as to more accurately control the temperature of the high-temperature area of the furnace body 1; the second heating system consists of a second heating element 31 and a second thermocouple 32 and is arranged in a low-temperature area of the furnace body 1, the second heating element 31 is formed by connecting 8 groups of U-shaped silicon-molybdenum rods in series, and the second thermocouple 32 is arranged on the outer side, close to the low-temperature area, of the second heating element 31 so as to ensure that the initial temperature of the low-temperature area is the same as that of the high-temperature area; the temperature monitoring system 4 consists of a plurality of thermocouple arrays and is arranged between the first thermocouple 22 and the second thermocouple 32, the temperature monitoring system 4 consists of 6 thermocouples, the distances between the thermocouples and the first thermocouple 22 and the second thermocouple 32 are equal, and the internal temperature of the sample chamber 5 can be uniformly monitored; the sample chamber 5 is arranged inside the furnace body 1 and below the first thermocouple 22, the second thermocouple 32 and the temperature monitoring system 4.
When the device is used, firstly, the control temperatures of the first heating system and the second heating system are set to be consistent, and after the temperature of the furnace body 1 is balanced, a test glass sample is put into the sample chamber 5; after the temperature is kept for a period of time (the heat preservation time is determined according to the glass formula), the second heating system is turned off, the temperature of the low-temperature region of the furnace body 1 is slowly reduced, the first heating system is continuously kept to be turned on, the temperature gradient in the sample chamber 5 is formed by controlling the first thermocouple 22 and the first heating element 21, the temperature in the sample chamber 5 is accurately monitored by the temperature monitoring system 4, the crystallization condition of the glass liquid in the cooling process is truly simulated, the glass crystallization upper limit temperature can be accurately measured, and therefore an accurate basis is provided for the control of the melting process of the optical glass.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model discloses to the ordinary skilled person in technical field's the prerequisite that does not deviate from the utility model discloses under the design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. A gradient furnace for optical glass experiments is characterized by comprising a furnace body, a first heating system, a second heating system, a temperature monitoring system and a sample chamber,
the first heating system consists of a first heating element and a first thermocouple and is arranged in a high-temperature area of the furnace body;
the second heating system consists of a second heating element and a second thermocouple and is arranged in a low-temperature area of the furnace body;
the temperature monitoring system consists of a plurality of thermocouple arrays and is arranged between the first thermocouple and the second thermocouple;
the sample chamber is arranged in the furnace body and below the first thermocouple, the second thermocouple and the temperature monitoring system.
2. The gradient furnace for optical glass experiments as claimed in claim 1, wherein the first heating element is composed of 4 groups of U-shaped silicon-molybdenum rods connected in series.
3. The optical glass experimental gradient furnace of claim 1, wherein the first thermocouple is disposed inside the first heating element.
4. The gradient furnace for optical glass experiments as claimed in claim 1, wherein the second heating element is formed by connecting 8 groups of U-shaped silicon-molybdenum rods in series.
5. The gradient furnace for optical glass experiments as claimed in claim 1, wherein the second thermocouple is disposed outside the second heating element near the low temperature region.
6. The gradient furnace for optical glass experiments as claimed in claim 1, wherein the temperature monitoring system comprises 6 thermocouples which are spaced apart from the first thermocouple and the second thermocouple at equal distances and can uniformly monitor the internal temperature of the sample chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223537477.2U CN218709906U (en) | 2022-12-29 | 2022-12-29 | Gradient furnace for optical glass experiments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223537477.2U CN218709906U (en) | 2022-12-29 | 2022-12-29 | Gradient furnace for optical glass experiments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218709906U true CN218709906U (en) | 2023-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223537477.2U Active CN218709906U (en) | 2022-12-29 | 2022-12-29 | Gradient furnace for optical glass experiments |
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| CN (1) | CN218709906U (en) |
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2022
- 2022-12-29 CN CN202223537477.2U patent/CN218709906U/en active Active
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