Device for recycling gas from heating furnace

Abstract

The present invention provides a device for recycling gas from a heating furnace, and relates to the technical field of gas recycling and reuse. The device for recycling gas from a heating furnace comprises a heating furnace, a double-layer high-temperature resistant metal tube, and an adjusting mechanism. A first connecting tube is provided through the left bottom of the heating furnace, an air inlet pipe is fixedly connected to the side wall of the first connecting tube, a first conduit is provided through the right wall of the heating furnace, the right end of the first conduit is connected to a fixed cylinder, a second conduit is provided through the right wall of the fixed cylinder, the bottom end of the second conduit is connected to an outer tube, a second connecting tube is provided through the left bottom of the outer tube, a return pipe is fixedly connected to the side wall of the second connecting tube, a return valve is provided inside the return pipe, and the end of the return pipe away from the second connecting pipe is connected to the first connecting pipe. The present invention anneals optical fibers through heat conducted by helium gas, thereby improving optical fiber quality.

Description

Technical Field

[0001] The present invention relates to the technical field of gas recovery and reuse, and in particular to a device for recovering and reusing gas from a heating furnace. Background Art

[0002] Fiber loss is a key performance characteristic of fiber transmission. High loss indicates short transmission distances. To meet long-distance transmission and maintain cost efficiency, fiber loss requirements are becoming increasingly stringent. Fiber loss is categorized as intrinsic loss and manufacturing loss. Intrinsic loss is an unavoidable loss inherent in the fiber material and determines the loss limit due to Rayleigh scattering. Intrinsic loss in quartz fiber includes both intrinsic absorption and Rayleigh scattering.

[0003] Optical fiber manufacturing loss is generated during the manufacturing process of optical fiber, mainly caused by the absorption of impurities in the optical fiber (impurity absorption) and structural defects of the optical fiber. The most influential impurity absorption is various transition metal ions and OH - The loss of light caused by ions. - The influence of ions is relatively large, and its absorption peaks are located at 950nm, 1240nm and 1390nm, which have a great impact on optical fiber communication systems. As the optical fiber manufacturing process becomes more and more perfect, the influence of transition metals is no longer significant, and the best process can make OH - Ion loss at 1390nm is reduced to 0.04dB / km, even to the point of being negligible. Imperfections in the optical fiber structure can also cause scattering loss, primarily due to the crystal structure inside the fiber.

[0004] In the drawing process, the research and development of low-loss optical fiber has lasted for nearly 20 years, and reducing optical fiber loss is still the research direction that many optical fiber manufacturers are committed to. Existing literature shows that some appropriately increase the height of the drawing tower to increase the natural cooling time of the bare fiber at the same drawing speed, and some add an annealing device after the bare fiber comes out of the heating furnace to keep the fiber at a high temperature. In addition, there is a problem with annealing to improve optical fiber attenuation. The impurities generated during the carbon heating process lead to poor optical fiber PT (abbreviation of fiber breakage rate). Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the shortcomings of the existing technology, the present invention provides a device for recycling gas from a heating furnace, which can use the heat conducted by helium to anneal the optical fiber, thereby improving the quality of the optical fiber and reducing the attenuation of the optical fiber.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for recycling gas from a heating furnace for reuse, comprising a heating furnace, a double-layer high-temperature resistant metal tube and a regulating mechanism, the double-layer high-temperature resistant metal tube comprising an outer tube and an inner tube, the inner tube being located inside the outer tube, a connecting tube being connected between the heating furnace and the inner tube, a first connecting tube being passed through the left bottom of the heating furnace, an air intake pipe being fixedly connected to the side wall of the first connecting tube, a first guide tube being passed through the right wall of the heating furnace, a right end of the first guide tube being connected to a fixed tube, a second guide tube being passed through the right wall of the fixed tube, a bottom end of the second guide tube being connected to the outer tube, a second connecting tube being passed through the left bottom of the outer tube, a side wall of the second connecting tube being fixedly connected to a return pipe, a return valve being provided inside the return pipe, and an end of the return pipe away from the second connecting pipe being connected to the first connecting pipe;

[0009] The adjusting mechanism includes a connecting frame and a fixed cylinder, the fixed cylinder is fixedly connected to the lower surface of the connecting frame, a driving motor is arranged inside the connecting frame, the output end of the driving motor is fixedly connected to a rotating shaft, the outer end of the rotating shaft is fixedly connected to a turntable, the outer surface of the turntable is rotatably connected to a connecting rod, the bottom end of the connecting rod is rotatably connected to a slide, the middle part of the lower surface of the slide is fixedly connected to a sliding rod, the bottom end of the sliding rod slides through the interior of the fixed cylinder and is fixedly connected to a piston.

[0010] Preferably, a light rod protective sleeve is provided through the upper side of the heating furnace.

[0011] Preferably, an air intake valve is provided inside the air intake pipe.

[0012] Preferably, a first one-way valve is provided at the connection between the first conduit and the fixed cylinder, and a second one-way valve is provided at the connection between the second conduit and the fixed cylinder.

[0013] Preferably, a plurality of energy-gathering rings are fixedly sleeved on the outer surface of the inner tube, and the energy-gathering rings are funnel-shaped.

[0014] Preferably, a temperature sensor is provided on one side of the second conduit.

[0015] Preferably, the side wall of the second connecting pipe is fixedly connected to an exhaust pipe, and an exhaust valve is provided inside the exhaust pipe.

[0016] (3) Beneficial effects

[0017] The present invention provides a device for recycling gas recovered from a heating furnace. It has the following beneficial effects:

[0018] A heating furnace and a double-layer high-temperature resistant metal tube are provided, and the heating furnace and the outer tube of the double-layer high-temperature resistant metal tube are connected, so that the heat in the heating furnace can be conducted to the inside of the outer tube of the double-layer high-temperature resistant metal tube, and the optical fiber is annealed with the heat conducted by helium, thereby improving the quality of the optical fiber and reducing the attenuation of the optical fiber.

[0019] An adjustment mechanism is provided, which drives the rotating shaft and the turntable to rotate through the driving action of the driving motor, and drives the slide plate and the slide rod to move back and forth up and down under the connection action of the connecting rod, thereby causing the piston to move back and forth up and down on the inner wall of the fixed cylinder. When the piston moves upward, air is drawn from the first conduit into the fixed cylinder, and when the piston moves downward, the air in the fixed cylinder is pressed into the second conduit, thereby realizing heat transfer, thereby facilitating the annealing of the optical fiber. In particular, since the annealing temperature is gradually and slowly reduced, the heat introduced can be gradually reduced by reducing the speed of the driving motor, thereby achieving the purpose of slowly cooling the optical fiber, ensuring a more compact crystal structure, and reducing optical fiber attenuation.

[0020] A reflux pipe is provided so that the heat after annealing can be reused, thereby reducing costs.

[0021] The annealing gas flows in the space on the inner wall of the outer tube. The gas extraction and recovery does not affect the operation of the optical fiber, prevents the optical fiber from shaking when the gas is recovered, and also prevents the exhausted gas from containing impurities that affect the quality of the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic cross-sectional view of the whole of the present invention;

[0024] Figure 3 It is a side view schematic diagram of the turntable of the present invention;

[0025] Figure 4 For the present invention Figure 2 A schematic diagram of the structure at center A;

[0026] Figure 5 It is a schematic diagram of the energy-gathering ring structure of the present invention.

[0027] Among them, 1. Heating furnace; 2. Double-layer high-temperature resistant metal tube; 21. Outer tube; 22. Inner tube; 3. Adjustment mechanism; 4. Inlet pipe; 41. Inlet valve; 5. First connecting pipe; 6. First conduit; 7. Second conduit; 8. Temperature sensor; 9. Energy focusing ring; 10. Second connecting pipe; 11. Return pipe; 111. Return valve; 12. Exhaust pipe; 121. Exhaust valve; 13. Light rod protective sleeve; 15. First one-way valve; 16. Second one-way valve; 17. Connecting pipe;

[0028] 31. Connecting frame; 32. Fixing cylinder; 33. Driving motor; 34. Rotating shaft; 35. Turntable; 36. Connecting rod; 37. Slide plate; 38. Sliding rod; 39. Piston. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example:

[0031] like Figure 1-5 As shown, an embodiment of the present invention provides a device for recycling gas from a heating furnace, comprising a heating furnace 1, a double-layer high-temperature resistant metal tube 2 and an adjusting mechanism 3. A light rod protective sleeve 13 is provided through the upper side of the heating furnace 1 for the entry of the light rod. The light rod melts under the high temperature of the heating furnace 1 and falls by gravity to form an optical fiber. The heating furnace 1 is a prior art and is used for high-temperature (2000°C) heating, which will not be described in detail here.

[0032] The double-layer high-temperature resistant metal tube 2 includes an outer tube 21 and an inner tube 22. The inner tube 22 is located inside the outer tube 21. A connecting tube 17 is connected between the heating furnace 1 and the inner tube 22. The optical fiber enters the inner tube 22 through the connecting tube 17 and then undergoes annealing. A first connecting tube 5 is provided through the left bottom of the heating furnace 1. The side wall of the first connecting tube 5 is fixedly connected to an air intake pipe 4. An air intake valve 41 is provided inside the air intake pipe 4 to control the introduction of the cooling gas helium.

[0033] A first conduit 6 is provided through the right side wall of the heating furnace 1. The right end of the first conduit 6 is connected to a fixed tube 32. A second conduit 7 is provided through the right side wall of the fixed tube 32. A temperature sensor 8 is provided in the middle of the second conduit 7 for detecting the temperature of the gas. The bottom end of the second conduit 7 is connected to the outer tube 21. The gas in the heating furnace 1 enters the outer tube 21 through the connection between the first conduit 6 and the second conduit 7, and anneals the optical fiber passing through the inner tube 22.

[0034] The outer surface of the inner tube 22 is fixedly sleeved with a number of energy-gathering rings 9, which are funnel-shaped and can guide the heated helium, increase the contact area, and accelerate heating; a second connecting pipe 10 is provided through the left bottom of the outer tube 21, and a return pipe 11 is fixedly connected to the side wall of the second connecting pipe 10, and a return valve 111 is provided inside the return pipe 11. The end of the return pipe 11 away from the second connecting pipe 10 is connected to the first connecting pipe 5, and the helium used after annealing can be reused. An exhaust pipe 12 is fixedly connected to the side wall of the second connecting pipe 10, and an exhaust valve 121 is provided inside the exhaust pipe 12, which can be discharged into the helium recovery system for collection. It can be reasonably arranged according to the existing technology, which is not shown in the figure.

[0035] The adjusting mechanism 3 includes a connecting frame 31 and a fixed cylinder 32. The fixed cylinder 32 is fixedly connected to the lower surface of the connecting frame 31. A driving motor 33 is provided inside the connecting frame 31. The output end of the driving motor 33 is fixedly connected to a rotating shaft 34. The outer end of the rotating shaft 34 is fixedly connected to a turntable 35. The outer surface of the turntable 35 is rotatably connected to a connecting rod 36. The bottom end of the connecting rod 36 is rotatably connected to a slide plate 37. The slide plate 37 is slidably connected to the inner wall of the connecting frame 31 to play a role of limited sliding. A sliding rod 38 is fixedly connected to the middle part of the lower surface of the slide plate 37. The bottom end of the sliding rod 38 slides through the interior of the fixed cylinder 32 and is fixedly connected to a piston 39. The piston 39 is slidably connected to the inner wall of the fixed cylinder 32; secondly, a first one-way valve 15 is provided at the connection between the first conduit 6 and the fixed cylinder 32, and a second one-way valve 16 is provided at the connection between the second conduit 7 and the fixed cylinder 32 for one-way conduction.

[0036] The above structure drives the rotating shaft 34 and the turntable 35 to rotate through the driving action of the driving motor 33, and drives the slide plate 37 and the slide rod 38 to move back and forth up and down under the connecting action of the connecting rod 36, thereby causing the piston 39 to move back and forth up and down on the inner wall of the fixed cylinder 32. When the piston 39 moves upward, air is drawn from the first conduit 6 into the fixed cylinder 32. When the piston 39 moves downward, the air in the fixed cylinder 32 is pressed into the second conduit 7, thereby realizing heat transfer, and facilitating the annealing of the optical fiber. Among them, since the annealing temperature is gradually and slowly reduced, the speed of the driving motor 33 can be reduced at this time, thereby gradually reducing the introduced heat, thereby achieving the purpose of slowly cooling the optical fiber, ensuring a more compact crystal structure, and reducing optical fiber attenuation.

[0037] Working principle: This device for recycling gas in a heating furnace is used. When in use, the optical rod is put into the heating furnace 1 from the optical rod sheath 13. The optical rod melts under the high temperature of the heating furnace 1 and falls by gravity to form an optical fiber. The optical fiber passes through the heating furnace 1 and the inner tube 22. The cooling gas helium is introduced into the heating furnace 1 for heating. By turning on the switch of the drive motor 33, the heated helium enters the outer tube 21, and then the optical fiber passing through the inner tube 22 can be annealed. Since the annealing temperature is gradually and slowly reduced, the speed of the drive motor 33 can be reduced at this time, and the heat introduced can be gradually reduced to achieve the purpose of slowly cooling the optical fiber, ensuring a more compact crystal structure and reducing optical fiber attenuation.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for recycling gas recovered from a heating furnace, characterized by: The invention comprises a heating furnace (1), a double-layer high-temperature resistant metal tube (2) and an adjusting mechanism (3), wherein the double-layer high-temperature resistant metal tube (2) comprises an outer tube (21) and an inner tube (22), wherein the inner tube (22) is located inside the outer tube (21), and a connecting tube (17) is connected between the heating furnace (1) and the inner tube (22). A first connecting tube (5) is provided through the bottom of the left side of the heating furnace (1), and an air inlet pipe (4) is fixedly connected to the side wall of the first connecting tube (5). A first guide tube (6) is provided through the right side wall of the heating furnace (1). The right end of the first conduit (6) is connected to a fixed cylinder (32), a second conduit (7) is provided through the right side wall of the fixed cylinder (32), the bottom end of the second conduit (7) is connected to the outer tube (21), a second connecting tube (10) is provided through the left bottom of the outer tube (21), a side wall of the second connecting tube (10) is fixedly connected to a return tube (11), a return valve (111) is provided inside the return tube (11), and the end of the return tube (11) away from the second connecting tube (10) is connected to the first connecting tube (5); The regulating mechanism (3) comprises a connecting frame (31) and a fixed cylinder (32), wherein the fixed cylinder (32) is fixedly connected to the lower surface of the connecting frame (31), a driving motor (33) is provided inside the connecting frame (31), an output end of the driving motor (33) is fixedly connected to a rotating shaft (34), an outer end of the rotating shaft (34) is fixedly connected to a turntable (35), an outer surface of the turntable (35) is rotatably connected to a connecting rod (36), a bottom end of the connecting rod (36) is rotatably connected to a slide plate (37), a middle portion of the lower surface of the slide plate (37) is fixedly connected to a sliding rod (38), a bottom end of the sliding rod (38) slides through the inside of the fixed cylinder (32) and is fixedly connected to a piston (39).

2. The device for recycling recovered gas from a heating furnace according to claim 1, characterized in that: A light rod protective sleeve (13) is provided through the upper side of the heating furnace (1).

3. The device for recycling recovered gas from a heating furnace according to claim 1, characterized in that: An air intake valve (41) is provided inside the air intake pipe (4).

4. The device for recycling recovered gas from a heating furnace according to claim 1, characterized in that: A first one-way valve (15) is provided at the connection between the first conduit (6) and the fixed cylinder (32), and a second one-way valve (16) is provided at the connection between the second conduit (7) and the fixed cylinder (32).

5. The device for recycling recovered gas from a heating furnace according to claim 1, characterized in that: A plurality of energy-gathering rings (9) are fixedly sleeved on the outer surface of the inner tube (22), and the energy-gathering rings (9) are funnel-shaped.

6. The device for recycling recovered gas from a heating furnace according to claim 1, characterized in that: A temperature sensor (8) is provided on one side of the second conduit (7).

7. The device for recycling recovered gas from a heating furnace according to claim 1, characterized in that: An exhaust pipe (12) is fixedly connected to the side wall of the second connecting pipe (10), and an exhaust valve (121) is provided inside the exhaust pipe (12).

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