CN211311296U - Muffle furnace heating device and muffle furnace - Google Patents
Muffle furnace heating device and muffle furnace Download PDFInfo
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- CN211311296U CN211311296U CN201921437899.8U CN201921437899U CN211311296U CN 211311296 U CN211311296 U CN 211311296U CN 201921437899 U CN201921437899 U CN 201921437899U CN 211311296 U CN211311296 U CN 211311296U
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Abstract
The utility model belongs to the field of plane glass production and discloses a muffle furnace heating device and a muffle furnace, wherein the heating device comprises a heating rod and an insulating sleeve, a heat preservation structure and a sealing sleeve which are sleeved at two ends of the heating rod; the insulating sleeve is positioned between the heating rod and the heat insulation structure, one side end face of the sealing sleeve is in contact with the insulating sleeve, an axial protrusion is arranged on the edge of the side end face of the sealing sleeve, and the end face of the axial protrusion is in contact with the surface of the heat insulation structure. The muffle furnace comprises a shell, an overflow groove and a heating device; the overflow groove and the heating device are both positioned in the shell, the overflow groove and the heat preservation structure are both connected with the inner wall of the shell, and the heating rod is arranged along the horizontal direction of the overflow groove. The part manufacturing gaps needing to be reserved at the bearing positions at the two ends of the heating rod are reduced through the sealing sleeve, the influence of air flow disturbance caused by the gaps on a space temperature field is reduced, the uniformity and the stability of the space temperature field are ensured, and meanwhile, the service life of the silicon carbide heater is effectively prolonged.
Description
Technical Field
The utility model belongs to plane glass production field relates to a muffle furnace 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 flat panel substrate glass of flat panel displays has increased greatly. 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.
The overflow downdraw method is in the production process and seriously depends on the size of an overflow groove and the accurate control of a temperature field at the periphery of the overflow groove in the production process, but in the using process of equipment, the service life of part of heating devices hardly reaches the service life working condition of the whole equipment, after the heating devices are damaged, the temperature field in the production process is in a state which is hardly accurately controlled, the overflow quality is seriously influenced, and finally the manufacturing cost of a product is seriously increased or the design and production requirements cannot be met.
Currently, referring to fig. 1, a conventional silicon carbide heater (circular or ring-shaped in cross-section) is mounted and fixed to a thermal insulation structure by an insulating sleeve. Because of the requirement of the overflow flow down-drawing method, in the whole set of forming equipment, the heating devices for heating the space of the overflow groove to ensure the space temperature field all use high-temperature resistant silicon carbide or silicon-molybdenum heaters, the bearing positions of the heaters are all positioned on the heat insulation structures at the two ends of the equipment, but because certain tolerance exists in the straightness of the heating devices in the manufacturing process and the errors of the heat insulation structures in the manufacturing and installing processes, part of manufacturing gaps need to be reserved at the bearing positions at the two ends of the heaters, and the gaps are large. Meanwhile, the manufacturing process of the overflow downward pulling method determines the current situation that the temperature of the upper part of the equipment is higher than that of the lower part of the equipment in the forming process, and the undesirable gas flow is generated at the part which is not completely sealed due to the chimney effect (namely, hot air moves upwards) in the production process, so that the heater at the corresponding position is corroded, and the service life of the heater and the uniformity of a temperature field are influenced. Meanwhile, in the use process of the heating device, the local temperature exceeds 1000 ℃, and under the condition of high temperature, the difficulty in the replacement process of a heating device replacement operator is high, the operation risk of the operator is high, and adverse effects such as adverse disturbance of a temperature field are caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome because current muffle furnace heating device's installation gap is big, and then produces gas flow, produces the erosion to the heater of relevant position, influences the problem of the homogeneity of heater life-span and temperature field, provides a muffle furnace heating device and muffle furnace.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
the utility model discloses an aspect, a muffle furnace heating device, which comprises a heating rod, wherein both ends of the heating rod are sleeved with an insulating sleeve, a heat preservation structure and a sealing sleeve; the insulating sleeve is positioned between the heating rod and the heat insulation structure, one side end face of the sealing sleeve is in contact with the insulating sleeve, an axial protrusion is arranged on the edge of the side end face of the sealing sleeve, and the end face of the axial protrusion is in contact with the surface of the heat insulation structure.
The utility model discloses muffle furnace heating device further improves and lies in:
the insulating sleeve is a stepped flange sleeve; the small end of the insulating sleeve is positioned between the heating rod and the heat insulation structure, one side end face of the large end is contacted with the heat insulation structure, and the other side end face is contacted with the sealing sleeve.
And heat insulation cotton is filled between the sealing sleeve and the heating rod.
And heat insulation cotton is filled between the sealing sleeve and the insulating sleeve.
The thickness of the sealing sleeve is 5-10 mm.
The sealing sleeve is made of alumina ceramics.
In another aspect of the present invention, a muffle furnace comprises a housing, an overflow trough and the above-mentioned heating device; the overflow groove and the heating device are both positioned in the shell, the overflow groove and the heat preservation structure are both connected with the inner wall of the shell, and the heating rod is arranged along the horizontal direction of the overflow groove.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses muffle furnace heating device, through establishing sealed sleeve pipe at the both ends cover of heating rod, sealed sleeve pipe one side end face contacts with insulation support, and the edge of sealed sleeve pipe this side end face sets up the axial arch, axially protruding terminal surface and insulation construction surface contact, and then convert the clearance between insulation construction and the heating rod and the clearance between insulation support and the heating rod into the clearance between sealed sleeve pipe and the heating rod, sealed sleeve pipe is small, be convenient for size processing, and then realize reducing the purpose in heating rod both ends clearance, the influence of air current disturbance to the space temperature field is prevented to have reduced, prevent because the air current is outwards flowed from clearance position gas, cause local clearance position air current to the heating rod erosion of relevant position, and then cause the heating rod to damage; meanwhile, in the use process of the heating rod, the local temperature exceeds 1000 ℃, and under the condition of high temperature, the difficulty in the replacement process of heating rod replacement operators is high, the operation danger of the operators is high, and adverse effects such as adverse disturbance of a temperature field are caused. The purpose of prolonging the service life of the silicon carbide heater is achieved, the replacement frequency of the silicon carbide heater is reduced, the smooth production is ensured, and the possibility of injury to operators is reduced.
Furthermore, heat preservation cotton is filled between the sealing sleeve and the heating rod, and heat preservation cotton is filled between the sealing sleeve and the insulating sleeve, so that gaps at two ends of the heating rod are further reduced, and local airflow disturbance is reduced.
Further, the thickness of sealing sleeve is 5 ~ 10mm, and less thickness can make the clearance between sealing sleeve and the heating rod littleer, but is less than 5 mm's thickness and too harsh to the requirement of material and processing technology, adopts 5 ~ 10 mm's thickness, not only in order to obtain littleer clearance, and processing is simple moreover, is convenient for realize.
Furthermore, the sealing sleeve is made of alumina ceramics, and the alumina ceramics has better conductivity, mechanical strength and high temperature resistance, can well bear the temperature of the heating rod, and is also convenient to process into the sealing sleeve with a preset shape.
The utility model discloses muffle furnace through adopting the heating device who has sealing sleeve, effectively guarantees the homogeneity and the stability of the inside temperature field of casing, and high-quality production of carrying out base plate glass has improved muffle furnace's life, reduces cost of maintenance.
Drawings
FIG. 1 is a schematic structural view of a conventional heating apparatus;
fig. 2 is a schematic structural view of the heating device of the present invention;
FIG. 3 is a schematic view of the heating device and overflow trough of the muffle of the present invention;
fig. 4 is a side view of fig. 3.
Wherein: 1-heating a rod; 2-an insulating sleeve; 3-a heat preservation structure; 4-sealing the sleeve; 5-an overflow trough; 6-substrate glass.
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 sequences other than those illustrated or otherwise 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:
referring to fig. 2, the first aspect of the present invention is a muffle furnace heating device, which comprises a heating rod 1, an insulating sleeve 2, a heat insulation structure 3 and a sealing sleeve 4.
The both ends of heating rod 1 are located two through-holes that offer on insulation construction 3 respectively, and the both ends structure of heating rod 1 is the same, describes only one end in this embodiment, and in on-the-spot operating mode, the difference at the both ends of heating rod 1 mainly is different at insulation construction 3's thickness, and mounting structure is the same.
Insulating sleeve 2 is ladder flange formula structure, overlaps and establishes on heating rod 1, and insulating sleeve 2's tip is located between heating rod 1 and insulation construction 3, and the surface of main aspects and insulation construction 3 surface contact. The sealing sleeve 4 is an annular flange sealing sleeve, is sleeved on the heating rod 1 and is in contact with the insulating sleeve 2 and the heat insulation structure 3.
The clearance between sealing sleeve 4 through the cover is established with insulation support 2 and heating rod 1 further reduces, the clearance that combines between sealing sleeve 4 and the heating rod 1 of ring flange and the clearance between sealing sleeve 4 and the insulation support 2 all use the cotton sealed design of heat preservation, local air current disturbance has been reached and has been reduced, the influence of air current disturbance to the space temperature field has been reduced, the homogeneity and the stability in space temperature field have been guaranteed, reduce the damage that heating rod 1 corrodes and causes, prolong the life-span of heating rod 1. Meanwhile, due to the fact that the service life of the heating rod 1 is prolonged, the replacement frequency of the heating rod 1 is reduced, smooth production is guaranteed, and the possibility that operators are injured is reduced.
Heating device need not remove in process of production, consequently with sealing sleeve 4 direct cover on heating rod 1 can, need not carry out extra fixed design, simple structure, be convenient for install and use.
In this embodiment, heating rod 1 adopts carborundum spiral heating rod, also can select for use the silicon molybdenum heating rod, and sealed sleeve 4 adopts the alumina ceramics preparation, and thickness control is at 5 ~ 10mm, and less thickness can guarantee that the clearance between sealed sleeve 4 and the heating rod 1 is as little as possible, promotes sealing performance, also can reach 20mm under specific circumstances, nevertheless can reduce the effect of reducing the clearance. The alumina ceramic has better conductivity, mechanical strength and high temperature resistance, can well bear the temperature of the heating rod 1, and is also convenient to process into the sealing sleeve 4 with a preset shape.
Referring to fig. 3 and 4, in a second aspect of the invention, a muffle comprises a housing, not shown in the figures, a heating device and an overflow channel 5. The heating device adopts the heating device, the heating device is positioned inside the shell and is connected with the inner wall of the shell through the heat preservation relieving 3, the heating rod 1 is horizontally arranged inside the shell, the overflow groove 5 is supported inside the shell through the front end and the rear end, the top end is provided with a groove, the side surface of the glass solution copper drum overflows and is pulled down, and then the substrate glass 6 is produced.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (7)
1. A muffle furnace heating device is characterized by comprising a heating rod (1), wherein both ends of the heating rod (1) are sleeved with an insulating sleeve (2), a heat-insulating structure (3) and a sealing sleeve (4);
the insulating sleeve (2) is located between the heating rod (1) and the heat preservation structure (3), one side end face of the sealing sleeve (4) is in contact with the insulating sleeve (2), an axial bulge is arranged on the edge of the side end face of the sealing sleeve (4), and the end face of the axial bulge is in surface contact with the heat preservation structure (3).
2. Muffle heating device according to claim 1, characterized in that the insulating sleeve (2) is a stepped flange sleeve; the small end of the insulating sleeve (2) is positioned between the heating rod (1) and the heat insulation structure (3), one side end face of the large end is contacted with the heat insulation structure (3), and the other side end face is contacted with the sealing sleeve (4).
3. Muffle heating device according to claim 1, characterized in that the sealing sleeve (4) and the heating rod (1) are filled with insulating cotton.
4. Muffle heating device according to claim 1, characterized in that the sealing sleeve (4) and the insulating sleeve (2) are filled with insulating cotton.
5. Muffle heating device according to claim 1, characterized in that the sealing sleeve (4) has a thickness of 5-10 mm.
6. Muffle heating device according to claim 1, characterized in that the sealing sleeve (4) is of alumina ceramic.
7. A muffle furnace comprising a housing, an overflow tank and a heating device according to any one of claims 1 to 6; the overflow groove and the heating device are both positioned in the shell, the overflow groove and the heat preservation structure (3) are both connected with the inner wall of the shell, and the heating rod (1) is arranged along the horizontal direction of the overflow groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921437899.8U CN211311296U (en) | 2019-08-30 | 2019-08-30 | Muffle furnace heating device and muffle furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921437899.8U CN211311296U (en) | 2019-08-30 | 2019-08-30 | Muffle furnace heating device and muffle furnace |
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| Publication Number | Publication Date |
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| CN211311296U true CN211311296U (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921437899.8U Active CN211311296U (en) | 2019-08-30 | 2019-08-30 | Muffle furnace heating device and muffle furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654343A (en) * | 2021-06-30 | 2021-11-16 | 陕西彩虹工业智能科技有限公司 | Muffle furnace silicon carbide heating system for manufacturing flexible glass and muffle furnace |
| CN115304247A (en) * | 2022-06-28 | 2022-11-08 | 虹阳显示(咸阳)科技有限公司 | Muffle furnace drainage plate crystallization prevention control device and method |
| CN115872605A (en) * | 2022-12-09 | 2023-03-31 | 彩虹显示器件股份有限公司 | Temperature-adjustable overflow trough, control system and method |
-
2019
- 2019-08-30 CN CN201921437899.8U patent/CN211311296U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654343A (en) * | 2021-06-30 | 2021-11-16 | 陕西彩虹工业智能科技有限公司 | Muffle furnace silicon carbide heating system for manufacturing flexible glass and muffle furnace |
| CN115304247A (en) * | 2022-06-28 | 2022-11-08 | 虹阳显示(咸阳)科技有限公司 | Muffle furnace drainage plate crystallization prevention control device and method |
| CN115872605A (en) * | 2022-12-09 | 2023-03-31 | 彩虹显示器件股份有限公司 | Temperature-adjustable overflow trough, control system and method |
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