CN217398748U - Overflow groove heating device and muffle furnace - Google Patents
Overflow groove heating device and muffle furnace Download PDFInfo
- Publication number
- CN217398748U CN217398748U CN202220400809.3U CN202220400809U CN217398748U CN 217398748 U CN217398748 U CN 217398748U CN 202220400809 U CN202220400809 U CN 202220400809U CN 217398748 U CN217398748 U CN 217398748U
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- Prior art keywords
- baffle
- molten glass
- heater
- overflow
- overflow groove
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 239000006060 molten glass Substances 0.000 claims abstract description 59
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 3
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 239000003870 refractory metal Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 230000009467 reduction Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 31
- 239000011521 glass Substances 0.000 description 24
- 230000008859 change Effects 0.000 description 13
- 239000002244 precipitate Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 239000000758 substrate Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 238000003280 down draw process Methods 0.000 description 3
- 238000007500 overflow downdraw method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
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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 provides an overflow launder heating device and muffle furnace can guarantee the homogeneity and the stability in space temperature field, improves production quality, extension equipment life, reduction in production cost simultaneously. The device comprises baffles arranged at two ends of an overflow groove, wherein one side of each baffle, which is in contact with molten glass flowing out of the overflow groove, is arranged in a bent shape and is used for changing the flowing direction of the molten glass, and a heater is arranged at the other side of each baffle; the heater is divided into an upper section and a lower section according to the position where the flow direction of the molten glass changes, wherein the upper section and the lower section adopt heaters with different resistivities.
Description
Technical Field
The utility model relates to a plane glass production technical field specifically is an overflow launder heating device and muffle furnace.
Background
With the use of a large number of devices with various flat panel display functions, such as notebook computers and smart phones, the market demand for manufacturing the flat substrate glass of the flat panel display is greatly increased. Meanwhile, due to the use of large-sized flat panel displays, increasingly higher requirements are put on parameters such as the size, the flatness and the internal stress of the flat substrate glass. In view of this great rise in demand, the overflow downdraw method plays a significant role in the production of flat substrate glass.
In the production process, the overflow downdraw method seriously depends on the accurate control of the size of the overflow groove and a space temperature field in the production process, but in the use process of equipment, the baffle plates at the two ends of the overflow groove have large heat loss to cause inevitable precipitate adhesion; meanwhile, the flow state of the glass in the baffle plate area can generate flow state change (due to the combined action of the molten glass liquid flowing downwards, the surface temperature of the molten glass liquid is reduced, the molten glass liquid receives surface tension, gravity, wetting of the baffle plate and the like, and the change of the flow state of the molten glass liquid is one of main inducements for inducing precipitates), so that the flow state of the baffle plate area is changed, namely, the glass liquid is easy to generate partial precipitates to be attached to the baffle plate in the time lapse of the baffle plate area, and the flow state is further deteriorated. A phenomenon that is unfavorable for production occurs. Finally, the plate thickness cannot be adjusted, and the service life of the whole equipment is shortened. The adverse effect of greatly increasing the production cost.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides an overflow launder heating device and muffle furnace can guarantee the homogeneity and the stability in space temperature field, improves production quality, extension equipment life, reduction in production cost simultaneously.
In order to achieve the above object, the utility model provides a following technical scheme:
an overflow groove heating device comprises baffle plates arranged at two ends of an overflow groove, wherein one side of each baffle plate, which is contacted with molten glass liquid flowing out of the overflow groove, is bent and used for changing the flowing direction of the molten glass liquid, and a heater is arranged at the other side of each baffle plate;
the heater is divided into an upper section and a lower section according to the position where the flow direction of the molten glass changes, wherein the upper section and the lower section adopt heaters with different resistivities.
Preferably, the heater is installed in a direction parallel to the flow direction of the molten glass.
Preferably, the lower section heater has a higher resistivity than the upper section heater.
Preferably, the ratio of the resistivity of the lower section heater to the resistivity of the upper section heater is not more than 5.
Preferably, the baffle is uniformly provided with heaters at positions where the flow direction of the molten glass liquid changes.
Preferably, the heater adopts a silicon carbon rod or a silicon molybdenum rod.
Preferably, the baffle is made of high-temperature-resistant metal material.
A muffle furnace comprises a shell, an overflow groove and the overflow groove heating device; the overflow groove and the overflow groove heating device are arranged inside the shell, and the overflow groove is connected with the inside of the shell.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides an overflow launder heating device, through all having a baffle at overflow launder both ends, glass liquid flows down from the overflow launder is inside to the outsider, and the baffle at both ends has guaranteed that glass liquid flows down at fixed region, and the baffle has certain direction to draw the effect to the flow direction of molten glass liquid, and the baffle not only plays gain and the important function of stabilizing the glass substrate size in the overflow drop-down method forming technology, plays the key role to the state of glass board limit portion simultaneously. Meanwhile, the baffle plate adopts a curved surface design at the front part contacting with the molten glass liquid, and the infiltration of the molten glass liquid and the baffle plate leads the glass flow direction in the area to have certain change, thereby ensuring excellent thickness distribution of the side plate and the plate width of the glass plate. On this basis the utility model discloses a mode of local heating is maintaining under the unchangeable prerequisite of original overflow launder heating form, and baffle department at the overflow launder both ends increases the heater, and this heater carries out the heat compensation through the space heat radiation to the molten glass liquid of baffle and baffle department, improves the mobility of baffle department molten glass liquid, reduces the precipitate of baffle department molten glass liquid. Overflow launder heating device can promote the temperature of baffle, improved the mobility and the temperature of baffle department molten glass liquid, reduced the quantity of baffle department molten glass liquid educt, delayed the speed that baffle department educt increased, better assurance overflow quality has improved equipment life.
Further, the utility model discloses in, because there is the flow direction change of molten glass liquid in the baffle lower part, the temperature demand of lower part is different on the baffle, can improve the heat compensation of baffle lower part through the different settings of the resistivity of heater upper segment and hypomere, under the condition that baffle lower part molten glass liquid flow is to changing, has reduced the precipitate production of baffle lower part, has guaranteed good overflow quality.
Drawings
FIG. 1 is a schematic plan view of an overflow trough heating apparatus of the present invention;
fig. 2 is a schematic perspective view of the overflow trough heating device of the present invention.
In the figure, 1, an overflow groove; 2. a baffle plate; 3. melting the molten glass; 4. a heater.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in fig. 1 and 2, the overflow chute heating device of the present invention comprises baffles 2 disposed at two ends of an overflow chute 1, wherein one side of each baffle 2 contacting with a molten glass 3 flowing out of the overflow chute 1 is bent to change the flowing direction of the molten glass 3, and a heater 4 is mounted on the other side of each baffle 2;
the heater 4 is divided into an upper section and a lower section at positions where the flow direction of the molten glass 3 changes, wherein the upper section and the lower section employ heaters 4 having different resistivities.
The utility model provides an overflow launder heating device, through all having a baffle 2 at 1 both ends of overflow launder, glass liquid flows down from overflow launder 1 is inside to the outside, the baffle 2 at both ends has guaranteed that glass liquid flows down in fixed region, baffle 2 has certain direction to draw the effect to the flow direction of fused glass liquid 3, baffle 2 not only plays gain and the important function of stabilizing the glass substrate size in the overflow drop-down method forming technology, plays the key role to the state of glass plate edge portion simultaneously. Meanwhile, the baffle 2 adopts a curved surface design at the front part contacting with the molten glass 3, and the infiltration of the molten glass 3 and the baffle 2 leads the glass flow direction in the area to have certain change, thereby ensuring excellent thickness distribution of the side plate and the plate width of the glass plate. However, the design of the baffle 2 exceeds the high temperature of more than 1000 ℃ due to the corresponding position, and the installation precision is ensured. The baffle 2 is made of thin high-temperature-resistant metal material. Due to the characteristic of higher thermal conductivity of the metal material, the temperature of the molten glass at the baffle 2 is increased by more heat dissipation capacity, so that the temperature of the molten glass flowing downwards along the baffle 2 is lower than that of the molten glass in the middle of the overflow chute 1. In addition, the molten glass flowing down the baffle 2 is relatively likely to generate precipitates due to loss of local heat and change in the flow state of the molten glass 3. The occurrence of the precipitates further causes the change of the flow state, and the change of the flow state is another reason why the precipitates are easily generated in the molten glass. The two are superposed, and the precipitated glass liquid at the baffle 2 is attached to the baffle 2, thereby further deteriorating the flow state. A positive correlation is generated which is not conducive to downward flow of the molten glass. After a certain period of time, the deposit attached to the position of the baffle 2 grows to a certain extent, so that the production requirement cannot be met, and the final equipment is withdrawn. In the later stage of production, the reduction of the yield is also obvious, and the reduction of the yield and the early exit of equipment also lead to the great increase of the production cost. Because the production state of the overflow downdraw method determines that the change of the flow state of the molten glass 3 at the position of the baffle 2 is the production characteristic and cannot be changed, the generation of precipitates can be reduced only by reducing the uncontrollable change of the flow state, namely improving the direction, particularly mainly compensating the temperature field of a local area.
On this basis the utility model discloses a mode of local heating is maintaining under the unchangeable prerequisite of original overflow launder 1 heating form, and baffle 2 department at overflow launder 1 both ends increases heater 4, and this heater 4 carries out the heat compensation through the space heat radiation to baffle 2 and the molten glass liquid 3 of baffle 2 department, improves the mobility of baffle 2 department molten glass liquid 3, reduces the educt of baffle 2 department molten glass liquid 3. The 1 heating device of overflow launder can promote the temperature of baffle 2, improved the mobility and the temperature of 2 fused glass liquid 3 of baffle, reduced the quantity of 2 fused glass liquid 3 educts of baffle, delayed the speed that 2 educts of baffle increase, better assurance overflow quality has improved equipment life.
Further, in the overflow down-draw process, the heater 4 is vertically installed, and the installation direction of the heater 4 is always parallel to the flow direction of the molten glass 3, so that the heating effect and the heating efficiency of the heater 4 can be ensured to the maximum extent, the flow form of the molten glass 3 in the flow process is maintained, and the possibility of adhesion and adsorption is reduced.
In the overflow down-drawing process, if the flowing direction of the molten glass 3 does not change, the heater 4 heats in a uniform heating mode to provide uniform heat for the baffle 2 and the molten glass 3 at the baffle 2.
In the overflow down-draw process, if the flow direction of the molten glass 3 changes, the heater 4 is divided into an upper section and a lower section at the position where the flow direction of the molten glass 3 changes or the position where the flow direction of the molten glass 3 changes obviously according to the flow direction of the molten glass 3, wherein the upper section and the lower section adopt heaters 4 with different resistivities.
Further, the lower heater 4 has a higher resistivity than the upper heater 4.
The utility model discloses in, because there is the flow direction change of molten glass liquid 3 in baffle 2 lower part, the temperature demand of baffle 2 upper and lower part is different, can improve the heat compensation of baffle 2 lower part through the different settings of the resistivity of heater 4 upper segment and hypomere, under the condition that 3 flows to the emergence changes in baffle 2 lower part molten glass liquid, has reduced the precipitate production of baffle 2 lower part, has guaranteed good overflow quality.
Further, the baffle 2 is uniformly provided with the heaters 4 at the position where the flowing direction of the molten glass 3 changes or changes obviously, the resistivity end of the lower section of each heater 4 needs to completely cover the position where the flowing direction of the molten glass 3 at the lower part of the baffle 2 changes or the position where the flowing direction of the molten glass 3 changes obviously, the inflection point of the baffle 2 is easy to cause uneven heating, the temperature of the molten glass 3 flowing to the inflection point can be ensured by the arrangement, and the output of precipitates due to local cooling caused by uneven heating can be avoided.
Further, the ratio of the resistivity of the lower heater 4 to the resistivity of the upper heater 4 is not more than 5.
Preferably, the ratio of the resistivity of the lower heater 4 to the resistivity of the upper heater 4 is less than 3, and the heating effect at the ratio is better as proved by tests.
Furthermore, the heater 4 of the present invention adopts a silicon carbon rod or a silicon molybdenum rod, and the heating is performed by radiation; the molten glass 3 is heated at the baffle 2 and the baffle 2 of the overflow vessel 1.
Further, the baffle 2 is made of high-temperature-resistant metal materials.
The utility model also provides an application of the overflow groove heating device of the utility model, a muffle furnace, which comprises a shell, an overflow groove 1 and the overflow groove heating device of the utility model; the overflow groove 1 and the overflow groove heating device are arranged inside the shell, the overflow groove 1 is connected with the inside of the shell, and the glass solution can be overflowed and drawn downwards in the muffle furnace to produce the substrate glass.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (8)
1. The overflow trough heating device is characterized by comprising baffle plates (2) arranged at two ends of an overflow trough (1), wherein one side, which is in contact with molten glass (3) flowing out of the overflow trough (1), of each baffle plate (2) is bent and used for changing the flowing direction of the molten glass (3), and a heater (4) is arranged at the other side of each baffle plate (2);
the heater (4) is divided into an upper section and a lower section according to the position where the flow direction of the molten glass (3) changes, wherein the upper section and the lower section adopt heaters (4) with different resistivities.
2. An isopipe heating apparatus in accordance with claim 1, wherein the heater (4) is mounted in a direction parallel to the direction of flow of the molten glass (3).
3. An isopipe heating apparatus in accordance with claim 1, wherein the lower section of the heater (4) has a higher resistivity than the upper section of the heater (4).
4. An isopipe heating apparatus in accordance with claim 1, wherein the ratio of the resistivity of the lower section of the heater (4) to the resistivity of the upper section of the heater (4) is no greater than 5.
5. Isopipe heating apparatus according to claim 1, wherein said baffles (2) are provided with heaters (4) uniformly arranged at the locations where the flow direction of the molten glass (3) changes.
6. An isopipe heating apparatus in accordance with claim 1, wherein the heater (4) is a silicon carbon rod or a silicon molybdenum rod.
7. An isopipe heating apparatus in accordance with claim 1, wherein said baffle (2) is made of a refractory metal material.
8. A muffle furnace, characterized by a housing, an isopipe (1) and an isopipe heating apparatus according to any of claims 1-7; the overflow groove (1) and the overflow groove heating device are arranged inside the shell, and the overflow groove (1) is connected with the inside of the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220400809.3U CN217398748U (en) | 2022-02-24 | 2022-02-24 | Overflow groove heating device and muffle furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220400809.3U CN217398748U (en) | 2022-02-24 | 2022-02-24 | Overflow groove heating device and muffle furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217398748U true CN217398748U (en) | 2022-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220400809.3U Active CN217398748U (en) | 2022-02-24 | 2022-02-24 | Overflow groove heating device and muffle furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217398748U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114426391A (en) * | 2022-02-24 | 2022-05-03 | 彩虹显示器件股份有限公司 | An overflow tank heating device and muffle furnace |
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2022
- 2022-02-24 CN CN202220400809.3U patent/CN217398748U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114426391A (en) * | 2022-02-24 | 2022-05-03 | 彩虹显示器件股份有限公司 | An overflow tank heating device and muffle furnace |
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