CN110803856A

CN110803856A - Optical glass bubbling device

Info

Publication number: CN110803856A
Application number: CN201910755132.8A
Authority: CN
Inventors: 姜敬陆; 张小建; 李攀
Original assignee: Hubei New Huaguang Information Materials Co Ltd
Current assignee: Hubei New Huaguang Information Materials Co Ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-02-18
Anticipated expiration: 2039-08-15
Also published as: CN110803856B

Abstract

The invention discloses an optical glass bubbling device, and belongs to the technical field of optical glass manufacturing. The method mainly solves the problem that the quality of optical glass is influenced because part of small-viscosity optical glass liquid flows into a bubbler to generate bubbler blockage. It is mainly characterized in that: comprises a bubbler and a cooling water jacket; the bubbler comprises an inner pipe (6), an outer pipe (8) and ceramic fiber cotton (7) clamped between the inner pipe and the outer pipe; the inner pipe (6) and the outer pipe (8) can be connected with a heating power supply through conducting wires. The possibility of blockage of the bubbler is reduced by designing a special bubbler; even under the condition that the bubbler is blocked, the bubbler can be dredged in a mode of heating by a large-current power supply and increasing the pressure of the bubbling gas, and the normal work of the bubbler is ensured.

Description

Optical glass bubbling device

Technical Field

The invention belongs to the technical field of optical glass manufacturing, and particularly relates to a bubbling device for optical glass.

Background

The bubbling technology is widely applied to glass manufacturing, can obviously improve the glass melting efficiency and improve the glass quality, and is also widely applied to the field of optical glass manufacturing. However, the manufacturing of optical glass is different from the manufacturing of general glass, and the application environment is special and complicated. For the general glass manufacturing field, the glass has single melting variety, the viscosity of the glass liquid is high, the glass is not easy to crystallize, and the phenomenon of blocking of a bubbler is not easy to occur. In the application of the optical glass, the optical glass has the characteristics of multiple varieties, small batch and the like, so that the optical glass melting furnace has the phenomenon of frequent variety replacement. In order to reduce the performance influence among varieties, the glass liquid needs to be completely emptied when the varieties are changed every time, so that the bubbler is repeatedly exposed to air, the temperature rise and fall amplitude of a bubbling outlet is large, and a silicon-rich phase of the glass liquid is easily formed to be aggregated at the outlet of the bubbler; secondly, the performance difference between the replaced glass varieties is large, and partial glass varieties are easy to crystallize, so that a large amount of glass liquid at the bottom of the smelting furnace is crystallized; thirdly, the viscosity of part of the optical glass liquid is extremely small, and the optical glass liquid can flow into the bubbler from the small hole of the bubbling port under special conditions to form glass liquid infiltration. The above situation causes the application environment of the bubbler of the optical glass to be severe, and the bubbler is blocked frequently, which affects the quality of the optical glass.

Disclosure of Invention

The present invention is directed to a bubbling device for optical glass, which is proposed in view of the above circumstances.

The technical solution of the invention is as follows:

a bubbling device for optical glass comprises a bubbler and a cooling water jacket, and is characterized in that: the bubbler comprises an inner pipe, an outer pipe and ceramic fiber cotton clamped between the inner pipe and the outer pipe; the inner tube and the outer tube can be connected with a heating power supply through conducting wires.

In the technical scheme of the invention, a section of capillary tube bundle or two sections of capillary tube bundles consisting of an upper capillary tube bundle and a lower capillary tube bundle are arranged in an upper section of tube cavity of the inner tube.

In the technical scheme of the invention, a baffle disc is welded on the outer wall of the outer pipe; the cooling water jacket comprises a water inlet pipe, a water outlet pipe and a cooling water cavity, and the cooling water cavity is a circular cylinder cavity with a circle center provided with a through hole; the upper surface of the cooling water cavity is abutted against the baffle disc; the bubbler and the cooling water jacket are matched with the step mounting holes on the furnace bottom brick.

According to the technical scheme, the inner pipe penetrates from the lower part of the outer pipe to the upper end of the outer pipe to be flush, and the upper end part of the inner pipe is turned outwards and welded with the inner wall of the outer pipe; the upper end of the outer pipe is welded with a hemispherical shell to form a gas collection cavity, and a bulging hole is drilled in the center of the top of the hemispherical shell.

In the technical scheme of the invention, the capillary tube bundle is formed by a plurality of thin metal tubes which are densely distributed and arranged in a circumference way and are welded into a whole; the upper end of the upper capillary tube bundle in the section of capillary tube bundle or the two sections of capillary tube bundles is flush with the turned edge of the inner tube and is firmly welded; the outer walls of the inner tubes at the upper end and the lower end of the lower capillary tube bundle in the two capillary tube bundles are spun to shrink the diameter of the tubes so as to fix the lower capillary tube bundle.

The technical scheme of the invention is that the thickness of the inner tube at the spinning contracted pipe diameter position of the outer wall of the inner tube is 1/2-2/3 of the normal thickness due to stretching.

In the technical scheme of the invention, the water inlet pipe and the water outlet pipe are welded on the bottom surface of the cooling water cavity, the height of the water inlet pipe in the cavity is flush with the bottom surface in the cavity, and the distance between the height of the water outlet pipe in the cavity and the upper surface of the cavity is the inner diameter of the water outlet pipe.

The use method of the optical glass bubbler comprises the following steps of:

① connecting the inner tube of the bubbler with an external gas source, introducing dry compressed gas to ensure that the pressure of the bubbled gas is greater than 0.3MPa and the gas in the pipeline has no leakage, and continuously or in a pulse mode, blowing the introduced compressed gas into the molten glass;

② when the viscosity of the glass liquid is small and the glass liquid is easy to crystallize or the bubbling pressure is too low, the glass liquid can enter the gas collecting cavity through the bubbling holes, and when the glass liquid is serious, the glass liquid can enter the capillary tube bundle to generate glass liquid solidification or crystallization, so that the bubbler is blocked;

③ when the bubbler is powered on, the inner tube wall of the bubbler at the capillary tube bundle part is thinner, the resistance is larger, the local heat productivity is large, and the local high temperature at the capillary tube bundle part is easier to provide, thereby being beneficial to the dredging of the bubbler.

The invention has the beneficial effects that: the bubbler device is designed, so that the bubbler can be prevented from being blocked under severe melting conditions of melting the easily-crystallized glass or emptying glass liquid in a melting furnace to replace glass varieties and the like; even if the bubbler is clogged under a specific condition, the clogged bubbler can be unclogged by heating the bubbler by supplying electricity and increasing the gas pressure. Thereby ensuring the stability of the melting process of the optical glass and reducing the refractive index fluctuation of the optical glass.

Drawings

FIG. 1 is a schematic view of an optical glass bubbler apparatus according to the present invention.

Fig. 2 is a schematic view of the installation of a capillary bundle of an optical glass bubbler apparatus according to the present invention.

In the figure: 1. a gas collection cavity; 2. bulging holes; 3. an upper capillary bundle; 4. a lower capillary bundle; 5. a catch tray; 6. an inner tube; 7. ceramic fiber cotton; 8. an outer tube; 9. a water inlet pipe; 10. a water outlet pipe; 11. a cooling water cavity; 12. a hearth brick; 13. and (5) spinning and pressing the ring.

Detailed Description

As shown in fig. 1 and 2. The invention relates to a bubbling device for optical glass, which structurally comprises a bubbler and a cooling water jacket. Wherein, the bubbler comprises an air-collecting cavity 1, an upper capillary tube bundle 3, a lower capillary tube bundle 4, a baffle disc 5, an inner tube 6, ceramic fiber cotton 7 and an outer tube 8. The cooling water jacket comprises a water inlet pipe 9, a water outlet pipe 10 and a cooling water cavity 11. Firstly, a bubbler is manufactured, capillaries with the same length are bundled, the diameter of an excircle of the bundled capillary is smaller than the inner diameter of the inner tube 6, the thermal fusion is carried out, the capillaries are ensured not to be blocked during the fusion, the upper capillary bundle 3 is manufactured, and the lower capillary bundle 4 is manufactured by the same method. And (4) taking one end of the inner pipe 6 for turning, wherein the turning diameter is smaller than the pipe diameter of the outer pipe 8, and manufacturing the upper edge of the inner pipe 6. Spinning is carried out at a certain distance from the upper edge of the inner tube 6, an inward concave ring is formed on the inner tube 6, a spinning ring 13 is formed, the lower capillary bundle 4 is placed in the spinning ring, spinning is carried out at the other side of the lower capillary bundle 4, and the lower capillary bundle 4 can be fixed in the inner tube 6. The wall thickness of the inner pipe is reduced by stretching during spinning, the thickness of the inner pipe at the spinning position is 1/2-2/3 of the normal thickness due to stretching, and the resistance value of the wall of the inner pipe at the spinning position is increased. And then the upper capillary bundle 3 is placed into the inner pipe 6 to be in parallel and level with the upper edge for spot welding, and the upper capillary bundle 3 is fixed. The outer tube 8 is sleeved on the inner tube 6, the inner tube 6 is subjected to parallel and level full welding at the upper edge, the high-temperature-resistant ceramic fiber cotton 7 is filled between the inner tube 6 and the outer tube 8 for insulation and heat insulation, and the length of the inner tube 6 is ensured to be longer than that of the outer tube 8 when materials are taken, so that the external power supply is convenient to wire. And manufacturing a thin-wall hemispherical crown with the outer diameter equal to that of the outer tube 8, drilling a hole at the top to form a bubbling hole 2, and fully welding the bottom of the bubbling hole with the outer tube 8 to form a gas collection cavity 1. The outer tube 8 which is at a certain distance from the bubbling hole 2 is sleeved with a circular ring piece and is fully welded with the wall of the outer tube 8 to form a baffle disc 5, the distance of the baffle disc 5 is suitable for the bubbling hole 2 to penetrate into the molten glass for a certain depth, and the baffle disc 5 is used for fixing the bubbler and blocking the flow of the molten glass.

The furnace bottom brick 12 is an erosion-resistant fused zirconia-corundum brick, a step round hole is drilled at the bottom, the upper part of the furnace bottom brick is small in aperture and used for penetrating a bubbler, the lower part of the furnace bottom brick is large in aperture and used for installing and fixing a cooling water jacket, the upper hole and the lower hole are coaxial, and the step surface is smooth. The manufactured bubbler is inserted into the furnace from the lower part of the furnace bottom brick 12, and then the cooling water jacket penetrates through the lower part, so that the end surface of the cooling water jacket is tightly propped against the bubbler baffle disc 5 and is fixed on the end surface of the step hole of the furnace bottom brick 12, and the bubbler is kept insulated from a furnace body frame, a platform and the like during installation and operation.

The high-pressure gas is butted with the inner pipe 6 through a hose, so that the butt joint is ensured to be airtight. The pressure and the flow of the gas are regulated, and the blown gas is kept to work continuously and normally. In the melting of a general optical glass, the bubbling gas pressure may be maintained at 0.3MPa or more, and an abnormal state such as devitrification of the glass liquid may occur, and the gas pressure may be increased appropriately.

The cooling water jacket of preparation is formed for stainless steel welding, and cooling water cavity 11 is the ring cylinder cavity of center trompil, and the ring cylinder up end is level and smooth, and lower terminal surface installs into,

outlet pipe

9, 10, and the 9 mouthfuls of depths of inlet tube and lower terminal surface inboard flush in the cavity, and the 10 mouthfuls of depths of outlet pipe are apart from about 1~2 outlet pipe diameters of up end inboard. The structure can keep water with a certain depth in the water jacket when the water jacket is used, ensure enough cooling water in the cooling water jacket, and completely drain the water in the water jacket when the water jacket is not in a working state. The cooling medium is deionized water, which can ensure that the cooling water jacket is not blocked.

Under special conditions, such as negative pressure and glass liquid crystallization in the bubbler, the bubbler is required to be dredged when the bubbler is abnormal and cannot work due to the action of a capillary tube bundle and the maintenance of gas pressure, ① confirms that no pipeline gas leaks, dry compressed gas is introduced, the pressure of the bubbling gas is properly increased, ② takes down a water inlet pipe of a cooling water jacket, ③ leads an inner pipe and an outer pipe at the lower part of the bubbler to be respectively connected with two electrodes of a large-current power supply, the bubbler is heated by electrifying and gradually increasing current, the temperature of the inner pipe wrapping ceramic fiber cotton for heat preservation is rapidly increased, solid glass infiltrated into the inner pipe is gradually melted (softened) and is discharged by high-pressure gas, so that the bubbler is dredged, a capillary tube bundle is easy to be connected into a gas collection tube bundle, and the gas collection tube bundle is easily dredged to be heated, the gas flow of the inner pipe is easily increased, the gas collection tube bundle is easily and the gas collection tube bundle is easily dredged to be more easily.

Claims

1. An optical glass bubbling device comprises a bubbler and a cooling water jacket, and is characterized in that: the bubbler comprises an inner pipe (6), an outer pipe (8) and ceramic fiber cotton (7) clamped between the inner pipe and the outer pipe; the inner pipe (6) and the outer pipe (8) can be connected with a heating power supply through conducting wires.

2. The optical glass bubbler apparatus according to claim 1, wherein: and a section of capillary tube bundle or two sections of capillary tube bundles consisting of the upper capillary tube bundle (3) and the lower capillary tube bundle (4) are arranged in the upper section of the inner tube (6).

3. An optical glass bubbler apparatus as claimed in claim 1 or claim 2 wherein: the outer wall of the outer pipe (8) is welded with a baffle disc (5); the cooling water jacket comprises a water inlet pipe (9), a water outlet pipe (10) and a cooling water cavity (11), and the cooling water cavity (11) is a circular cylinder cavity with a center provided with a through hole; the upper surface of the cooling water cavity (11) is propped against the baffle disc (5); the bubbler and the cooling water jacket are matched with step mounting holes on the furnace bottom brick (12).

4. An optical glass bubbler apparatus as claimed in claim 1 or claim 2 wherein: the inner pipe (6) penetrates from the lower part of the outer pipe (8) to the upper end of the outer pipe to be flush, and the upper end part of the inner pipe (6) is turned outwards and welded with the inner wall of the outer pipe (8); the upper end of the outer pipe (8) is welded with a hemispherical shell to form a gas collection cavity (1), and a bulging hole (2) is drilled in the center of the top of the hemispherical shell.

5. The optical glass bubbler device according to claim 4, wherein: the capillary tube bundle is formed by a plurality of thin metal tubes which are densely distributed on the circumference and are welded into a whole; the upper end of the upper capillary tube bundle (3) in the section of capillary tube bundle or the two sections of capillary tube bundles is flush with the turned edge of the inner tube (6) and is firmly welded; the outer walls of the inner tubes (6) at the upper end and the lower end of the lower capillary tube bundle (4) in the two capillary tube bundles are spun to shrink the diameter of the tubes so as to fix the lower capillary tube bundle (4).

6. The optical glass bubbler apparatus according to claim 1, wherein: the inner pipe at the spinning contracted pipe diameter position of the outer wall of the inner pipe (6) is stretched to 1/2-2/3 with the pipe wall thickness being the normal thickness.

7. The optical glass bubbler apparatus according to claim 1, wherein: the water inlet pipe (9) and the water outlet pipe (10) are welded on the bottom surface of the cooling water cavity (11), the height of the water inlet pipe (9) in the cavity is flush with the inner bottom surface of the cavity, and the inner diameter of the water outlet pipe (10) is separated from the upper surface of the cavity by the height of the water outlet pipe (10) in the cavity.