CN113880400A

CN113880400A - Heating and heat-insulating structure for liquid level at top of channel feeding pipe

Info

Publication number: CN113880400A
Application number: CN202111146716.9A
Authority: CN
Inventors: 王答成; 王梦龙; 杨威
Original assignee: Irico Display Devices Co Ltd
Current assignee: Irico Display Devices Co Ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-01-04

Abstract

A liquid level heating and heat preservation structure at the top of a channel feeding pipe comprises a side heater, a top heater and a top heat preservation brick, wherein the top heater and the top heat preservation brick are sequentially and fixedly arranged above the side heater; the top heater is provided with a first through hole, and the first through hole comprises a straight hole heating part at the upper part and a cavity heating part at the lower part; heating wires are arranged on the side walls of the straight hole heating part and the cavity heating part; the cavity heating part is of a circular truncated cone structure; a second through hole is formed in the top insulating brick; the second through hole is coaxially communicated with the first through hole. The inner wall of top heater is provided with the heater strip among this heating insulation construction, and the heat radiation of production can gather at the top of feeder sleeve, and top insulating brick can prevent hot volatile gas condensation on this regional wall, improves the space temperature of liquid level top, has improved the uniformity of the interior liquid temperature of feeder sleeve and the yields of product, has realized the function and the performance requirement of feeder sleeve.

Description

Heating and heat-insulating structure for liquid level at top of channel feeding pipe

Technical Field

The invention belongs to the technical field of substrate glass manufacturing, and relates to a heating and heat-insulating structure for a liquid level at the top of a channel feeding pipe.

Background

The platinum channel plays an important process role in the manufacturing process of the substrate glass, and the states of the designed molten glass in the pipeline are different due to the difference of functional principles of different areas of the platinum channel. For example, in the fining section, since it is necessary to perform fining and bubble removal of the molten glass at a high temperature, a space portion for allowing bubbles to escape needs to be provided above the liquid surface in the pipe. The stirring section area needs to realize homogenization for the molten glass by inserting a stirrer. In addition, the other type is that the liquid level of the system needs to meet the effect of a communicating vessel, and the designed opening structure above the liquid level keeps the liquid level communicated with the external atmospheric pressure, so that the consistency change of the local liquid level and the liquid level of the system is realized. However, such a structure with an opening above the liquid surface also causes certain temperature field defects, i.e. it is difficult to maintain a certain high temperature atmosphere in the opening area. The level of these zones therefore often shows an increase in viscosity and a decrease in fluidity, with a consequent accumulation over time of heterogeneous glass formation, in particular at the top of the feed tank. The upper liquid level does not participate in the movement of the lower flow field under the normal condition, but under the special condition, for example, the liquid level is easy to be disturbed and disordered by the sudden fluctuation of the liquid level, the stagnation balance of the liquid level area is broken, and the heterogeneous glass is involved in the lower flow field. Because the regional distance shaping of feed tank is nearer, the glass that consequently rolls into is difficult to melt in short time and disappears, finally leads to heterogeneous glass to get into the defect on the regional glass substrate that forms of shaping, and this type of defect often presents the transparent color similar with glass, only shows the micro-change in thickness, must observe through professional lighting equipment can comparatively clear manifestation, and this type of defect as long as the glass substrate that appears will judge useless, very big influence product percent of pass.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a heating and heat-insulating structure for the liquid level at the top of a channel feeding pipe, which can effectively improve the space temperature above the liquid level, ensure that the temperature of the liquid level above the liquid level is consistent with that of a flow field below the liquid level while the liquid level meets the communication with the external atmosphere, effectively avoid the appearance of heterogeneous glass and improve the yield of products.

The invention is realized by the following technical scheme:

a liquid level heating and heat preservation structure at the top of a channel feeding pipe comprises a side heater, a top heater and a top heat preservation brick, wherein the top heater and the top heat preservation brick are sequentially and fixedly arranged above the side heater;

the top heater is provided with a first through hole, and the first through hole comprises a straight hole heating part at the upper part and a cavity heating part at the lower part; heating wires are arranged on the side walls of the straight hole heating part and the cavity heating part; the cavity heating part is of a circular truncated cone structure;

a second through hole is formed in the top insulating brick; the second through hole is coaxially communicated with the first through hole.

Preferably, the top heater, the top insulating brick and the side heater below the top heater have the same outer diameter.

Preferably, the straight hole heating part, the cavity heating part and the feed pipe are coaxially arranged.

Preferably, an included angle between the circular truncated cone inclined plane of the cavity heating part and the horizontal plane is 45 degrees.

Preferably, the top heater comprises two top heating elements arranged mirror-symmetrically; the upper part of the inner wall of the top heating element after combination forms a straight hole heating part, and the lower part forms a cavity heating part.

Preferably, a plurality of first wire grooves and second wire grooves for winding the heating wires are respectively arranged on the side walls of the straight hole heating part and the cavity heating part in parallel at intervals along the circumferential direction of the straight hole heating part and the cavity heating part; the depth extending direction of the first wire groove is horizontally arranged, and the depth extending direction of the second wire groove is perpendicular to the inner wall of the cavity.

Preferably, the upper surface of top heating member is equipped with and is used for making the heater strip winds out and goes out the silk groove, it sets up with the first silk groove at the top with the horizontal plane to go out the silk groove.

Preferably, the ends of the first wire groove and the second wire groove are communicated, and a communicated side groove is arranged at the communication position.

Preferably, the width and the height of the wire outlet groove, the first wire groove, the second wire groove and the communicating side groove are all larger than the diameter of the heating wire.

Preferably, gaps are reserved between the wire outlet groove, the first wire groove, the second wire groove and the connecting side groove and the heating wires, and mud fillers made of alumina materials are arranged at the gaps.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention provides a liquid level heating and heat-insulating structure at the top of a channel feeding pipe, which is characterized in that a top heater and a top heat-insulating brick with heating wires on the inner wall are arranged above a side heater, the lower part of the top heater is provided with a circular table type heating cavity, the top heater is provided with an inclined heating surface, generated heat radiation can be gathered at the top of the feeding pipe, a straight hole heating part is arranged above the top heater, hot volatile gas is prevented from being condensed on the wall surface of the area, the space temperature above the liquid level is improved, liquid above the feeding pipe is effectively heated and insulated, meanwhile, through holes communicated with the outside atmosphere are designed on the top heater and the top heat-insulating brick, the uniformity of the liquid temperature in the feeding pipe and the yield of products are improved, and the function and performance requirements of the feeding pipe are realized.

Furthermore, the top heater, the top insulating brick and the heaters on the side parts below the top heater are consistent in outer diameter, so that the connection of all parts is firmer, and the structure is more stable.

Further, the cavity structure of lower part sets up to the round platform structure that has 45 contained angles, can make the focus of thermal radiation in the positive centre of feed pipe, and the liquid of top heats in the abundant feed pipe, improves thermal utilization ratio.

Further, the top heater includes two top heating members that mirror symmetry set up, makes things convenient for winding of heater strip to establish more for the use of this structure is more convenient. And, the upper portion of its inner wall constitutes the straight hole heating part after the top heating member combination, and its lower part constitutes the cavity heating part, effectively guarantees thermal production volume and utilization ratio.

Furthermore, the first wire groove and the second wire groove are arranged, so that the winding of the heating wire can be more convenient and faster, and meanwhile, the installation of the heating wire can be firmer. The setting of first silk groove and second silk groove degree of depth extending direction can make the heat radiation that the heater strip produced effectively concentrate in the top of passageway feed pipe, improves thermal utilization ratio.

Furthermore, the wire outlet groove can enable the heating wires to be more convenient and faster to mount and fix.

Further, the setting in intercommunication limit groove can guarantee that top heater is around establishing the heater strip after, and the surface of two top heating member butt joints that mirror symmetry set up is guaranteed to the leakproofness of butt joint back top heating member and is leveled, improves the structure steadiness of device.

Furthermore, the width and the height of the wire outlet groove, the first wire groove, the second wire groove and the communication side groove are larger than the diameter of the heating wire, so that the installation space of the heating wire can be ensured, and the situation that the heating wire is damaged due to physical friction in the installation process and the use safety and the service life of the structure are influenced is avoided.

Furthermore, the wire outlet groove, the first wire groove, the second wire groove and the gap between the communicated side groove and the heating wire are sealed and filled with alumina pug. The alumina pug can meet the high temperature resistance and strength performance of the brick structure.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a top plan view of a top heating element;

FIG. 3 is a bottom view of the top heating element;

FIG. 4 is a schematic structural view of the top insulating brick of the present invention.

In the figure: the heating device comprises a feeding pipe 1, liquid 2, a top heater 3, a side heater 4, a top insulating brick 5, an upper straight hole heating part 30, a lower cavity heating part 31, a top heating element 32, a wire outlet groove 321, a first wire groove 322, a second wire groove 323, a communication side groove 324 and a second through hole 50.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

As shown in figure 1, the top liquid level heating and heat preservation structure of the channel feeding pipe comprises a top heater 3 and a top heat preservation brick 5 which are sequentially and fixedly arranged above a side heater 4. The top heater 3 is wound and installed with a platinum wire as a heating matrix inside, generates heat by loading direct current, further transfers heat to a liquid level area in a heat radiation mode, and keeps the temperature of the liquid level to be more than 1200 ℃. The top insulating brick 5 is an insulating structure designed for the top heater 3, so that heat generated by the top heater 3 can be maintained and transferred to the inside as much as possible, and the utilization rate of the heat is improved.

As shown in fig. 1, the top heater 3 is provided with a first through hole including an upper straight hole heating portion 30 and a lower cavity heating portion 31; the straight hole heating part 30 mainly considers the balance of the internal and external air pressures, so that the liquid level is in a free state communicated with the atmosphere, namely the liquid level at the position is consistent with the liquid level of the system, and the diameter of the straight hole heating part 30 is designed to be 15mm, thus meeting the balance of the air pressure. The inner wall of the straight hole heating section 30 is provided with heating wires to prevent hot volatile gases from condensing on the wall surface of this region. The cavity heating part 31 of lower part can adopt round platform shape cavity structure, is provided with the heater strip on its inner wall, and the design of round platform height is 60mm, also can adjust the height value as required, and the height value decides cavity inclined plane length, further decides the quantity that the heater strip was placed promptly, influences the thermal power size of heater strip. The inclined plane and the horizontal plane angle design of circular platform shape cavity structure are 45 in this embodiment, ensure that heat energy carries out the heat radiation effect to the liquid level region for the heat utilization ratio that the heater strip produced is higher, improves the space temperature of liquid level top, effectively heats and keeps warm the liquid of the top in the feed pipe. The top heater 3 is made of alumina material, wherein the purity of alumina must be higher than 95%, which can satisfy the high temperature resistance and strength performance of brick structure

The top heater 3, the top insulating brick 5 and the side heater 4 below the top heater are consistent in outer diameter, so that all parts are connected more firmly, and the structure is more stable.

As shown in fig. 2, the top heater 3 may include two top heating members 32 arranged in mirror symmetry. The top heating members 32 are assembled so that the upper portions of the inner walls thereof constitute the straight hole heating sections 30 and the lower portions thereof constitute the cavity heating sections 31. The inner wall of the straight hole heating part is provided with a plurality of mounting grooves of heating wires, namely a first wire groove 322, and the number of the mounting grooves is two in the embodiment. The first wire groove 322 is horizontally arranged in the depth extending direction and is used for heating the area and preventing hot volatile gas from condensing on the wall surface of the area. The width of the heating wire mounting groove is designed according to the diameter matching of the heating wires, the diameter of the heating wire in the area is designed to be 3.0mm at present, so that the groove width is designed to be 5.0mm, the mounting space of the heating wire is ensured, and meanwhile, the pitch of the wire grooves is designed to be 4mm, so that more heating wire grooves are ensured to be placed. The side wall of the cavity heating part 31 at the lower part of the heating part is provided with a second wire groove 323 for installing the heating wire, the depth extending direction of the second wire groove 323 is perpendicular to the inner wall of the cavity, so that the heat generated by the heating wire can be effectively concentrated above the channel feeding pipe, and the utilization rate of the heat is improved. The depth of the first wire groove and the second wire groove is designed to be 30mm, the height can be increased according to the requirement of heating capacity, and then the number of winding turns is increased, namely, the heating quantity is also correspondingly increased.

One side of the top heating member 32 upper surface, the position that is close to the through-hole is equipped with and is used for making the heater strip goes out wire groove 321 that the heater strip was wound out, and the width and the height of going out wire groove 321 are according to the heater strip silk diameter matching design, because present silk diameter is 3.0mm, therefore the width and the height of wire groove all design 8.0mm, ensure that the silk material can easily pass and draw forth, be connected with external connection. The preferable wire outlet groove 321 and the uppermost first wire groove 322 are arranged on the same horizontal plane, so that the use safety of the heating wire is ensured.

As shown in fig. 3, since the heating wire needs to be wound in the first wire groove and the second wire groove, and the edge portion of each adjacent wire groove needs to be bent by 180 °, the ends of the first wire groove 322 and the second wire groove 323 are provided with a communicating edge groove 324 for accommodating a space of a wire winding inflection point, the width of the edge groove is designed to be 10mm, and the height of the edge groove is designed to be 8 mm.

After the heating wires of the top heater 3 are wound and installed, alumina pugs made of the same material are used for sealing and filling the residual gaps in the wire outlet groove 321, the communicating side groove 324, the first wire groove 322 and the second wire groove 323, the purity of the alumina must be higher than 95%, and the high temperature resistance and the strength performance of the structure are guaranteed; finally, the platinum wires in the heater are required to be completely sealed and wrapped, so that the too fast oxidation and volatilization in a high-temperature environment are prevented. The same filling material has the same thermal deformation physical property, and the effectiveness of filling and sealing is ensured.

The lower surface of the top heater 3 is overlapped with the upper surface of the side heater 4, and has the same size. The top heating member 32, as described above, has a semi-cylindrical outer contour, and the circumferential diameter of the top heating member is consistent with the outer diameter of the lower side heater 4, and is currently designed to be 145mm according to the outer diameter matching design of the feeding top liquid level pipe 1, and may also be designed to be 120mm to 200mm according to the heat conduction efficiency.

The top insulating brick 5 is placed on the upper part of the top heater 3 and is mainly used for isolating heat generated by the heating wires on the inner wall of the top heater and converting the heat into downward heat as far as possible. As shown in fig. 4, the top insulating brick 5 is designed into a cylindrical structure, the external contour dimension of the top insulating brick is the same as the external contour of the top heater 3, and the top insulating brick 5 is provided with a second through hole 50 which is communicated with the first through hole on the top heater 3, so that the balance of internal and external air pressure is achieved, and the free state of the liquid level is maintained. Preferably, the second through hole 50 and the first through hole are coaxial through hole structures, so that a balance structure of liquid level and air pressure is ensured, meanwhile, the diameter of the second through hole is minimized, the heat loss is minimized, the communication with the external atmosphere is met, and the functions of the second through hole and the first through hole are optimally balanced.

Through the structural functions, the liquid 2 in the channel feeding pipe 1 can be effectively heated, so that the viscosity of the liquid at the upper part of the channel feeding pipe is similar to that of the internal glass fluid, the channel feeding pipe participates in the normal operation of a flow field environment, and the formation of heterogeneous glass with increased viscosity is eliminated from the source. Before the heating device is used, the temperature of the liquid surface area at the top of the feeding pipe is only about 900 ℃ through actual measurement, the viscosity of the glass is close to a semi-solid state, and the glass is difficult to normally participate in a lower flow field, and under the action of the structure, the actually measured temperature of the liquid surface at the top reaches 1218 ℃, and is equivalent to the temperature of the glass of the lower flow field, so that the heating device is further proved to be effective in heating the liquid surface, and meanwhile, the reject ratio caused by the defects of heterogeneous glass is basically eliminated. It can be seen that this configuration increases the temperature of the space above the channel feed conduit 1 and that an increase in the temperature of the top liquid in the liquid 2 in the feed conduit can be achieved.

According to the feeding pipe top structure, the platinum liquid level pipe 1 inside the feeding pipe top structure is the same as platinum in a feeding area, the feeding pipe top structure is made of platinum-rhodium alloy materials, the Rh content is controlled to be about 10%, the strength stability of the structure of the feeding area is guaranteed, the glass liquid level is located inside the platinum feeding pipe 1, the liquid level is basically located at 1/3 of the feeding pipe 1, certain fluctuation can occur in the actual production process, high-viscosity glass with the thickness of about 20mm is measured in the glass located at the liquid level in the production process, the viscosity is gradually reduced from top to bottom, the glass liquid level is finally transited to the normal glass liquid viscosity, the temperature above the liquid level pipe in the area is measured actually, the temperature at the platinum liquid level pipe opening above the liquid level is reduced to 800 ℃, the measured temperature on the liquid level is only about 900 ℃, and the power of the side heater 4 is maximized at the moment. The height of the platinum feeding pipe 1 is designed to be 300mm, the fluctuation range of the liquid level and 2/3 allowance required to be reserved at the upper part are mainly considered, the pipe diameter is designed to be 50mm, and the wall thickness of the platinum feeding pipe is designed to be 1.0 mm. Lateral heater 4, it belongs to the structure of former scheme, only can carry out appropriate amount heating to the glass liquid in feed pipe 1, and the heating principle is the joule heat that inside heater strip produced under the circular telegram condition, through heat-conduction to platinum pipe wall and inside glass liquid, through the device, can effectively improve the temperature of the inside upper portion liquid of feed pipe 1.

Through the structural functions, the liquid level in the feeding pipe 1 can be effectively heated, so that the viscosity of the liquid level is similar to that of the internal glass fluid, the liquid level participates in the normal operation of a flow field environment, and the formation of heterogeneous glass with increased viscosity is eliminated from the source.

Claims

1. A liquid level heating and heat-insulating structure at the top of a channel feeding pipe is characterized by comprising a side heater (4), a top heater (3) and a top heat-insulating brick (5), wherein the top heater (3) and the top heat-insulating brick are sequentially and fixedly arranged above the side heater (4);

the top heater (3) is provided with a first through hole, and the first through hole comprises a straight hole heating part (30) at the upper part and a cavity heating part (31) at the lower part; heating wires are arranged on the side walls of the straight hole heating part (30) and the cavity heating part (31); the cavity heating part (31) is of a circular truncated cone structure;

a second through hole (50) is formed in the top insulating brick (5); the second through hole (50) is coaxially communicated with the first through hole.

2. The structure for heating and insulating the liquid level at the top of a channel feed pipe according to claim 1, characterized in that the top heater (3), the top insulating brick (5) and the side heater (4) below the top heater have the same outer diameter.

3. A channel feed tube top surface heating insulation structure according to claim 1, characterized in that the straight hole heating part (30), the cavity heating part (31) and the feed tube (1) are coaxially arranged.

4. The structure for heating and insulating the liquid level at the top of the channel feed pipe according to claim 1, wherein the included angle between the inclined surface of the circular truncated cone of the cavity heating part (31) and the horizontal plane is 45 °.

5. A channel feed tube top liquid level heating insulation structure as claimed in claim 1, characterized in that said top heater (3) comprises two top heating elements (32) arranged mirror-symmetrically; the top heating member (32) is assembled so that the upper part of the inner wall thereof constitutes a straight hole heating portion (30) and the lower part thereof constitutes a cavity heating portion (31).

6. The structure for heating and insulating the liquid level at the top of the channel feed pipe according to claim 5, wherein a plurality of first wire grooves (322) and second wire grooves (323) for winding the heating wires are respectively arranged on the side walls of the straight hole heating part (30) and the cavity heating part (31) at intervals in parallel along the circumferential direction; the depth extending direction of the first wire groove (322) is horizontally arranged, and the depth extending direction of the second wire groove (323) is perpendicular to the inner wall of the cavity.

7. The structure for heating and keeping the temperature of the liquid level at the top of the channel supply pipe according to claim 6, wherein the top heating member (32) is provided at the upper surface thereof with a filament outlet groove (321) for winding out the heating filament, and the filament outlet groove (321) is disposed at the same level as the uppermost first filament groove (322).

8. The structure for heating and insulating the liquid level at the top of the channel feed pipe according to claim 6, wherein the ends of the first wire groove (322) and the second wire groove (323) are communicated with each other, and a communicating side groove (324) is arranged at the communication position.

9. The structure for heating and insulating the liquid level at the top of the channel feed pipe according to claim 8, wherein the width and height of the filament outlet groove (321), the first filament groove (322), the second filament groove (323) and the communicating side groove (324) are larger than the diameter of the heating filament.

10. The structure for heating and insulating the liquid level at the top of the channel feeding pipe according to claim 9, wherein gaps are reserved between the wire outlet groove (321), the first wire groove (322), the second wire groove (323) and the communicating side groove (324) and the heating wires, and the gaps are filled with alumina material mud.