Tin bath gas protection device for glass production

Abstract

The utility model provides a tin bath gas protection device for glass production, which relates to the technical field of glass production devices and comprises a tin bath body and a gas mixing box. A high-temperature cavity, a temperature cavity and a low-temperature cavity are sequentially formed in the tin bath body; the gas mixing box is connected with a nitrogen source and a hydrogen source and connected with a gas conveying main pipe, the gas conveying main pipe is connected with three gas conveying branch pipes, the three gas conveying branch pipes extend into the high-temperature cavity, the temperature cavity and the low-temperature cavity respectively, the hydrogen source is further connected with a second hydrogen guide pipe, and the second hydrogen guide pipe is connected with three hydrogen branch pipes. And the three hydrogen branch pipes are respectively connected to the three gas transmission branch pipes. The device provided by the utility model has the beneficial effects that the hydrogen branch pipes of the device are respectively provided with a first hydrogen flow regulating valve, and the first hydrogen flow regulating valves can independently regulate the flow of hydrogen entering the three gas transmission branch pipes, so that the hydrogen concentration of protective gas in different temperature cavities in the tin bath is accurately regulated, and the glass production quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of glass production devices, in particular to a tin bath gas protection device used for glass production. Background Art

[0002] The tin bath is one of the important equipment in the production process of float glass. It is mainly used to quench the surface of float glass and provide a stable tin layer to ensure that the glass surface is smooth and flat. The general tin bath is usually an integral tin bath. The inner wall of this tin bath has only one cavity, which is filled with protective gas (generally a mixture of nitrogen and hydrogen). The concentration of hydrogen in the protective gas in the tin bath is basically the same everywhere inside the tin bath. For some glasses with special components or special uses (such as high borosilicate glass), the process temperature control accuracy requirements are high. During the production process, it is necessary to divide multiple temperature zones (temperature chambers) in the tin bath, and the temperature of the temperature zone is reduced in sequence to prevent the temperature difference between the surface and the center of the glass liquid, resulting in uneven flow rate of the glass liquid, causing the glass to fail to meet the flatness requirements. For temperature chambers with different temperatures, it is necessary to ensure that the proportion of the protective gas in them needs to be slightly different (that is, the ratio of nitrogen and hydrogen) to prevent the problem of tempered rainbow that is more likely to appear on glass. The existing tin bath gas protection system can only adjust the overall intake volume of hydrogen and nitrogen, but it is difficult to adjust the relative concentration of hydrogen and nitrogen in the protective gas, and it is impossible to accurately control the hydrogen concentration in different temperature chambers in the tin bath, which makes it difficult to control and improve the quality of glass. Utility Model Content

[0003] In view of this, in order to improve the control accuracy of the gas protection component of the tin bath gas protection system, so that it can accurately control the hydrogen concentration in different temperature chambers of the tin bath, and improve the quality of the produced glass, the utility model provides a tin bath gas protection device for glass production, including a tin bath body and a gas mixing box;

[0004] The tin bath body is provided with a high temperature chamber, a temperature chamber and a low temperature chamber in sequence;

[0005] The gas mixing box is connected with a nitrogen conduit, a first hydrogen conduit and a gas main pipe, and the gas main pipe is connected with three gas branch pipes, and the three gas branch pipes all pass through the tin bath body and extend to the high temperature chamber, the temperature chamber and the low temperature chamber respectively;

[0006] The nitrogen conduit and the first hydrogen conduit are connected to a nitrogen source and a hydrogen source respectively. The hydrogen source is also connected to a second hydrogen conduit. The second hydrogen conduit is connected to three hydrogen branch pipes. The three hydrogen branch pipes are respectively connected to three input branch pipes. Each hydrogen branch pipe is provided with a first hydrogen flow regulating valve.

[0007] Furthermore, a return air port is provided on the tin bath body, and the return air port is connected to the high temperature chamber, the temperature chamber and the low temperature chamber at the same time. A return air duct is also provided on the gas mixing box, and the return air duct connects the return air port and the gas mixing box. A vacuum pump is provided on the return air duct.

[0008] Furthermore, a one-way valve is provided on the return air duct.

[0009] Furthermore, a partition plate is provided above the interior of the tin bath body, and the partition plate separates a return air chamber above the interior of the tin bath body. The return air port is provided on the side wall of the tin bath body and connected to the return air chamber. A plurality of connecting holes are provided on the partition plate, and the return air chamber is connected to the high-temperature chamber, the temperature chamber and the low-temperature chamber through the connecting holes.

[0010] Furthermore, the gas mixing box is fixed to the side wall of the tin bath body.

[0011] Furthermore, the ends of the three gas transmission branches are respectively provided with injection pipes, each injection pipe is provided with a plurality of protective gas nozzles, and the three injection pipes are respectively located in the high-temperature chamber, the temperature chamber, and the low-temperature chamber.

[0012] Furthermore, the return air duct is also provided with a dust removal filter for removing tin ash in the gas in the return air duct.

[0013] Furthermore, a storage pipe for collecting tin ash is also provided at the bottom of the dust removal filter.

[0014] Furthermore, a heat exchange cooler is provided on the return air duct.

[0015] Furthermore, the heat exchange cooler includes a heat exchange tube and a protective cover. The heat exchange tube is bent and both ends of the heat exchange tube are connected to the return air duct through connecting joints. The protective cover covers the outside of the heat exchange tube and has multiple heat dissipation holes distributed on the protective cover.

[0016] The beneficial effects of the tin bath gas protection device for glass production of the utility model are:

[0017] (1) The tin bath gas protection device comprises a tin bath body and a gas mixing box; a high temperature chamber, a temperature chamber and a low temperature chamber are sequentially arranged in the tin bath body; the gas mixing box is connected to a nitrogen source and a hydrogen source, a gas supply main is connected to the gas mixing box, three gas supply branches are connected to the gas supply main, the three gas supply branches extend to the high temperature chamber, the temperature chamber and the low temperature chamber respectively, and a second hydrogen conduit is connected to the hydrogen source, the second hydrogen conduit is connected to three hydrogen branches, the three hydrogen branches are respectively connected to three input branches, each hydrogen branch is provided with a first hydrogen flow regulating valve, the three first hydrogen flow regulating valves can independently adjust the hydrogen flow entering the three gas supply branches, so that the tin bath gas protection device can accurately control the hydrogen concentration in different temperature chambers in the tin bath, thereby improving the glass production quality.

[0018] (2) The gas mixing box of the tin bath gas protection device is also provided with a return gas duct, which can filter and separate the tin ash in the protective gas discharged from the bath gas, thereby recycling part of the protective gas, thereby reducing the consumption of protective gas and reducing the cost of glass manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic cross-sectional structure diagram of a tin bath gas protection device for glass production according to an embodiment of the present invention.

[0020] Figure 2 It is a right view of a tin bath gas protection device for glass production according to an embodiment of the utility model.

[0021] Figure 3 yes Figure 1 Schematic diagram of the internal structure of the heat exchange cooler.

[0022] In the above figure: 1-tin bath body, 11-bank plate, 12-partition plate, 13-return air port, 2-gas mixing box, 3-nitrogen conduit, 4-first hydrogen conduit, 41-second hydrogen conduit, 42-hydrogen branch pipe, 43-first hydrogen flow regulating valve, 5-gas main pipe, 51-gas branch pipe, 52-injection pipe, 53-protective gas nozzle, 54-tee joint, 6-return air conduit, 7-heat exchange cooler, 71-heat exchange pipe, 72-connecting joint, 73-protective cover, 74-heat dissipation hole, 8-dust removal filter. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the implementation mode of the utility model will be further described below in conjunction with the accompanying drawings.

[0024] Please refer to Figures 1 to 3 , a tin bath gas protection device for glass production, including a tin bath body 1 and a gas mixing box 2.

[0025] Two step plates 11 are provided in the tin bath body 1, and the two step plates 11 divide the cavity in the tin bath body 1 into three temperature chambers. The three temperature chambers are a high temperature chamber, a temperature chamber and a low temperature chamber arranged from left to right. The high temperature chamber, the temperature chamber and the low temperature chamber are connected through the notch groove on the step plate 11.

[0026] The gas mixing box 2 is a rectangular hollow box, and a pressure gauge and a hydrogen concentration detection gauge are provided on the gas mixing box 2. The gas mixing box 2 is fixed to the side wall of the tin bath body 1. The gas mixing box 2 is connected with a nitrogen conduit 3, a first hydrogen conduit 4 and a gas transmission main 5, wherein the nitrogen conduit 3 and the first hydrogen conduit 4 are nitrogen sources and hydrogen sources respectively. In this embodiment, the nitrogen source and the hydrogen source are high-pressure nitrogen tanks and hydrogen tanks respectively. The nitrogen conduit 3 and the first hydrogen conduit 4 are respectively provided with a nitrogen regulating valve and a second hydrogen regulating valve. The nitrogen conduit 3 and the first hydrogen conduit 4 are respectively used to input nitrogen and hydrogen into the gas mixing box 2. The nitrogen regulating valve and the second hydrogen regulating valve regulate the input flow of nitrogen and hydrogen. The gas mixing box 2 mixes the nitrogen and hydrogen therein into the tin bath protective gas. The gas main pipe 5 is connected to three gas branch pipes, which all pass through the tin bath body 1 and extend to the high-temperature chamber, the temperature chamber and the low-temperature chamber respectively. The ends of the three gas branch pipes are respectively provided with injection pipes 52, each of which is provided with a plurality of protective gas nozzles 53. The three injection pipes 52 are respectively located in the high-temperature chamber, the temperature chamber and the low-temperature chamber.

[0027] The gas main pipe 5 inputs protective gas into the high-temperature chamber, the temperature chamber and the low-temperature chamber respectively through three gas branch pipes. The function of the protective gas is to maintain a slight positive pressure in the tin bath body 1, so that the external air does not enter the tin bath body 1, and prevent the tin liquid from oxidizing. The hydrogen in the protective gas can also consume the residual oxygen in the tin bath body 1.

[0028] The hydrogen source is also connected to a second hydrogen conduit 41, and the second hydrogen conduit 41 is connected to three hydrogen branch pipes 42. The three hydrogen branch pipes 42 are respectively connected to three input branch pipes through three-way joints 54. Each hydrogen branch pipe 42 is provided with a first hydrogen flow regulating valve 43. The three hydrogen branch pipes 42 respectively replenish hydrogen for the protective gas entering the three temperature chambers. The three first hydrogen flow regulating valves 43 respectively adjust the flow rate of hydrogen replenished for the protective gas entering the three temperature chambers, so that the hydrogen content of the protective gas entering the three temperature chambers can be independently adjusted, thereby improving the quality of glass production.

[0029] It should be noted that the hydrogen in the protective gas in the gas mixing box 2 is controlled to be reduced, and when it is input into the three temperature chambers, the hydrogen branch pipe 42 is required to supplement the input hydrogen. The three first hydrogen flow regulating valves 43 can respectively supplement and adjust the hydrogen content of the protective gas entering the three temperature chambers, so that the tin bath gas protection device can accurately control the hydrogen concentration in different temperature chambers in the tin bath body.

[0030] Preferably, the tin bath body 1 is also provided with a return air port 13, which is connected to the high temperature chamber, the temperature chamber and the low temperature chamber at the same time. Specifically, a partition plate 12 is also provided above the inside of the tin bath body 1, and the partition plate 12 separates the return air chamber above the inside of the tin bath body 1. The return air port 13 is arranged on the side wall of the tin bath body 1 and is connected to the return air chamber. The partition plate 12 is provided with a plurality of connecting holes, and the return air chamber is connected to the high temperature chamber, the temperature chamber and the low temperature chamber through the connecting holes. The gas mixing box 2 is also provided with a return air duct 6, which connects the return air port 13 and the gas mixing box 2, and the return air duct 6 is provided with an exhaust pump. The return air duct 6 is also provided with a one-way valve, and the exhaust pump is used to extract part of the protective gas overflowing from the tin bath body 1 to the gas mixing box 2 for reuse, thereby reducing the consumption of the protective gas, and the one-way valve is used to make the protective gas in the return air duct 6 flow to the gas mixing box 2 in one direction (the exhaust pump and the one-way valve are both shown in the figure).

[0031] Preferably, the return air duct 6 is also provided with a dust removal filter 8 for removing tin ash in the gas in the return air duct 6. The dust removal filter 8 is used to remove tin ash (tin oxide powder) in the recovered protective gas to ensure the cleanliness of the recovered protective gas. A storage pipe for collecting tin ash is also provided at the bottom of the dust removal filter 8.

[0032] Preferably, a heat exchange cooler 7 is provided on the return air duct 6, and the heat exchange cooler 7 is arranged between the return air port 13 and the dust removal filter 8. The heat exchange cooler 7 includes a heat exchange tube 71 and a protective cover 73. The heat exchange tube 71 is bent and made of copper. Both ends of the heat exchange tube 71 are connected to the return air duct 6 through connecting joints 72. The protective cover 73 covers the outside of the heat exchange tube. A plurality of heat dissipation holes 74 are distributed on the protective cover 73. The heat exchange cooler 7 is used to cool the high-temperature protective gas in the return air duct 6 by air cooling, to ensure that the tin oxide in the recovered protective gas can be fully condensed into a powder state, to ensure that the tin oxide in the protective gas can be removed as much as possible, and to further improve the cleanliness of the recovered protective gas.

[0033] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0034] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tin bath gas protection device for glass production, characterized in that: It includes a tin bath body and a gas mixing box; The tin bath body is provided with a high temperature chamber, a temperature chamber and a low temperature chamber which are connected in sequence; The gas mixing box is connected with a nitrogen conduit, a first hydrogen conduit and a gas main pipe, and the gas main pipe is connected with three gas branch pipes, and the three gas branch pipes all pass through the tin bath body and extend to the high temperature chamber, the temperature chamber and the low temperature chamber respectively; The nitrogen conduit and the first hydrogen conduit are connected to a nitrogen source and a hydrogen source respectively. The hydrogen source is also connected to a second hydrogen conduit. The second hydrogen conduit is connected to three hydrogen branch pipes. The three hydrogen branch pipes are respectively connected to three input branch pipes. Each hydrogen branch pipe is provided with a first hydrogen flow regulating valve.

2. A tin bath gas protection device for glass production according to claim 1, characterized in that: The tin bath body is also provided with an air return port, which is connected to the high temperature chamber, the temperature chamber and the low temperature chamber at the same time. The gas mixing box is also provided with an air return duct, which connects the air return port and the gas mixing box. The air return duct is provided with an air pump.

3. A tin bath gas protection device for glass production according to claim 2, characterized in that: A one-way valve is also provided on the air return conduit.

4. A tin bath gas protection device for glass production according to claim 2, characterized in that: A partition plate is also provided above the interior of the tin bath body, and the partition plate separates a return air chamber above the interior of the tin bath body. The return air port is provided on the side wall of the tin bath body and connected to the return air chamber. A plurality of connecting holes are provided on the partition plate, and the return air chamber is connected to the high-temperature chamber, the temperature chamber and the low-temperature chamber through the connecting holes.

5. The tin bath gas protection device for glass production according to claim 1, characterized in that: The gas mixing box is fixed to the side wall of the tin bath body.

6. A tin bath gas protection device for glass production according to claim 1, characterized in that: The ends of the three gas transmission branches are respectively provided with injection pipes, each of which is provided with a plurality of protective gas nozzles, and the three injection pipes are respectively located in the high-temperature cavity, the temperature cavity and the low-temperature cavity.

7. A tin bath gas protection device for glass production according to claim 2, characterized in that: The return air duct is also provided with a dust removal filter, which is used to remove tin ash in the gas in the return air duct.

8. A tin bath gas protection device for glass production according to claim 7, characterized in that: A storage pipe for collecting tin ash is also provided at the bottom of the dust removal filter.

9. A tin bath gas protection device for glass production according to claim 7, characterized in that: A heat exchange cooler is arranged on the return air duct.

10. A tin bath gas protection device for glass production according to claim 9, characterized in that: The heat exchange cooler includes a heat exchange tube and a protective cover. The heat exchange tube is bent, and both ends of the heat exchange tube are connected to the return air duct through connecting joints. The protective cover covers the outside of the heat exchange tube, and a plurality of heat dissipation holes are distributed on the protective cover.

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