Rare earth chelate evaporation equipment

Abstract

The rare earth chelate evaporation equipment comprises a raw material gas evaporation tank, a sleeve and a material conveying pipe, and the material conveying pipe is provided with a first material conveying section and a second material conveying section; the rare earth chelate evaporation equipment further comprises a material mixing device; the material mixing device comprises a heater and a Tesla valve; a gas inlet of the Tesla valve is connected with one end of the first material conveying section and is used for enabling suspended granular solid raw materials in the raw material gas to repeatedly collide in the Tesla valve so as to reduce the size of the solid raw materials, so that the solid raw materials in the Tesla valve are sublimated into gas under the heating of the heater. Granular fine solid raw materials in raw material gas can repeatedly collide in the Tesla valve, so that the size is reduced, and the solid raw materials in the Tesla valve are heated under the assistance of the heater outside the Tesla valve, so that the solid raw materials in the Tesla valve can be quickly sublimated into gas; therefore, suspended granular fine solid raw materials in the raw material gas can be reduced.

Description

Technical Field

[0001] The invention belongs to the field of optical fiber production equipment, and more specifically, relates to a rare earth chelate evaporation device. Background Art

[0002] Rare earth-doped optical fiber is an important component of fiber lasers, and the performance stability of lasers is mainly determined by the product quality of rare earth-doped optical fiber. In this regard, a large number of scholars have carried out theoretical research on the preparation process of rare earth-doped optical fiber.

[0003] At present, the commonly used rare earth ion doping technologies include: solution immersion technology, nano-deposition technology, high-temperature gas phase doping technology and aerosol doping technology. At present, when preparing rare earth-doped optical fibers, the rare earth ion doping methods all use a single doping technology, among which the most widely used are high-temperature gas phase doping technology and solution immersion technology.

[0004] CN202410311357.5 discloses a gas-liquid composite doping device for preparing rare earth-doped optical fiber, including a chelate feed pipe, the chelate feed pipe includes a sleeve and multiple feed pipes, and also includes a process gas container, an oven, a rare earth solution storage tank, a circulating water cooling device and a raw gas evaporation tank, the process gas container is connected to multiple first gas outlet pipes and a second gas outlet pipe, a second gas outlet pipe and an infusion pipe are inserted into the rare earth solution storage tank, and the infusion pipe passes through the circulating water cooling device, so that the circulating water cooling device water-cools the infusion pipe, so that the temperature of the rare earth solution flowing into the liner tube by the infusion pipe is maintained within a set range. This technology can classify the temperature control of the raw materials input into the liner tube, the gas phase doping raw materials are kept warm by oil bath, and the liquid phase doping can be kept cold by water cooling to prevent the gas and liquid from affecting each other, and the raw materials can be doped on the inner wall of the liner tube on the same lathe. However, when the above-mentioned gas-liquid composite doping equipment is used in production, some solid raw materials have strong acid corrosiveness after absorbing water, which causes the feed pipe to be corroded frequently, causing safety hazards. In addition, the water peak, attenuation and other parameters of the prepared optical fiber are unstable, resulting in low quality of the prepared optical fiber or a high rate of defective products. Summary of the invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides a rare earth chelate evaporation device, in which the Tesla valve of the mixing device can make the raw material vapor and particles collide repeatedly in the cavity of the mixing device, and finally enable the fine particles to sublimate into gas, thereby reducing the residual material formed by the fine raw material particles in the feed pipeline and the instability of the water peak, attenuation and other parameters of the optical fiber caused by the fine raw material particles in the liner.

[0006] To achieve the above object, according to the present invention, a rare earth chelate evaporation device is provided, comprising a raw gas evaporation tank, a sleeve and a feed pipe connecting the raw gas evaporation tank and the sleeve, characterized in that:

[0007] The feed pipe comprises a first feed section and a second feed section, one end of the first feed section extends into the raw gas evaporation tank to guide out the raw gas formed by sublimation of the powdered solid raw material in the raw gas evaporation tank;

[0008] The rare earth chelate evaporation device further comprises a mixing device, the mixing device comprises a heater and a Tesla valve, and the Tesla valve is arranged inside the heater to heat the Tesla valve;

[0009] The air inlet of the Tesla valve is connected to the end of the first material conveying section away from the raw gas evaporation tank, so as to allow the granular solid raw materials suspended in the raw gas to collide repeatedly in the Tesla valve to reduce the size of the solid raw materials, so that the solid raw materials in the Tesla valve are sublimated into gas under the heating of the heater, thereby reducing the granular solid raw materials entering the second material conveying section and the casing;

[0010] The gas outlet of the Tesla valve is connected to the second material conveying section.

[0011] Preferably, the heater surrounds the Tesla valve 360° to uniformly heat the Tesla valve, thereby facilitating sublimation of granular solid raw materials in the Tesla valve.

[0012] Preferably, the flow rate of the raw gas in the Tesla valve is 0.1 m / s to 0.3 m / s.

[0013] Preferably, the first feeding section and the second feeding section are both arranged vertically and coaxially.

[0014] Preferably, the temperature of the carrier gas introduced into the raw material gas evaporation tank is equivalent to the temperature inside the raw material evaporation tank, so as to reduce the influence on the temperature field inside the raw material evaporation tank.

[0015] Preferably, the heater is an electric heater, and the power of the heater is 200W to 300W.

[0016] Preferably, the internal temperature of the Tesla valve is higher than the internal temperature of the raw material evaporation tank.

[0017] Preferably, the feed pipe is placed in an oven so that the oven heats the feed pipe so that the temperature of the feed pipe in the oven is higher than the internal temperature of the raw material evaporation tank.

[0018] Preferably, the Tesla valve is a pipeline structure, and has a straight main pipe and a branch pipe connected to the side wall of the straight main pipe, and the straight main pipe, the first material conveying section and the second material conveying section are coaxially arranged.

[0019] Preferably, there are a plurality of branch pipes to allow the granular solid raw materials to fully collide with each other so as to reduce the size of the solid raw materials.

[0020] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0021] 1) A rare earth chelate evaporation device of the present invention adopts a Tesla valve to allow the granular fine solid raw materials in the raw gas to collide repeatedly in the Tesla valve so that the size can be reduced, and the solid raw materials in the Tesla valve are heated by a heater outside the Tesla valve at the same time, so that the solid raw materials in the Tesla valve can be quickly sublimated into gas, thereby reducing the suspended granular fine solid raw materials in the raw gas, making it difficult for the solid raw materials to adhere to the inner wall of the feed pipe and the sleeve to form residues, greatly eliminating the hidden danger of some residues with strong water absorption and strong acid generated after water absorption remaining on the feed pipe and the sleeve to corrode the feed pipe and the valve, and eliminating the hidden danger of instability of optical fiber water peak, attenuation and other parameters caused by the granular solid raw materials entering the liner tube used for burning optical fiber from the sleeve, thereby improving the stability and safety of optical fiber production.

[0022] 2) In the rare earth chelate evaporation equipment of the present invention, an independent heater is provided outside the Tesla valve to uniformly heat the Tesla valve, so that the solid raw materials in all directions around the Tesla valve can be heated, preventing the solid raw materials in some places from being not heated and being on the feed pipe, thereby further improving the sublimation efficiency of the solid raw materials in the Tesla valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the mixing device in the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Patent CN202410311357.5 discloses a gas-liquid composite doping device for preparing rare earth-doped optical fibers. When high-temperature gas-phase doping technology is used to prepare rare earth-doped optical fibers, the feed pipe 3 and the casing 2 are filled with raw gas. The main reason why the feed pipe 3 and the casing 2 are often corroded is often believed to be due to the corrosive raw gas filled in the pipe. Therefore, the conventional countermeasure is to use non-corrosive solid raw materials inside the raw gas evaporator. This will reduce the types of rare earth doping and the types of rare earth-doped optical fibers that can be prepared, resulting in limited production scale.

[0027] However, in practice, it is found that the main reason for the corrosion of the feed pipe is that the solid particles of the raw materials adhere to the pipe and absorb water. At the same time, when the solid particles of the raw materials adhere to the precision stop valve on the feed pipe, the valve is not closed tightly, making the concentration of the doping component unstable.

[0028] The present invention does not change the type of solid raw materials. Starting from the granular solid raw materials in the raw gas, it is committed to reducing or even eliminating the granular solid raw materials in the raw gas, so that the sublimation of the solid raw materials reduces the impact on the feed pipe 3, the sleeve 2 and the precision stop valve, and does not affect the water peak, attenuation and other parameters of the optical fiber.

[0029] Specifically, refer to Figure 1 , Figure 2 , a rare earth chelate evaporation device, comprising a raw gas evaporation tank 1, a sleeve 2, and a feed pipe 3 connecting the raw gas evaporation tank 1 and the sleeve 2. The structures of the raw gas evaporation tank 1, the sleeve 2, and the feed pipe 3 can refer to the contents of patent CN202410311357.5, a gas-liquid composite doping device for preparing rare earth-doped optical fiber, which will not be repeated here.

[0030] The feed pipe 3 has a first feed section and a second feed section, and one end of the first feed section extends into the raw gas evaporator 1 to guide the raw gas formed by the sublimation of the powdered solid raw material in the raw gas evaporator 1. The powdered solid raw material in the raw gas evaporator 1 can be sublimated into raw gas after heating, and the raw gas is pressed out through the carrier gas introduced into the raw gas evaporator 1, and the raw gas and the carrier gas enter the first feed section together. The temperature of the carrier gas introduced into the raw gas evaporator 1 is preferably equivalent to the temperature inside the raw material evaporator to reduce the impact on the temperature field in the raw material evaporator. The carrier gas can preferably be an inert gas. The carrier gas storage tank 5 contains compressed carrier gas, which is introduced into the raw gas evaporator 1 through the carrier gas pipeline 6 to press the raw gas out.

[0031] The rare earth chelate evaporation equipment also includes a mixing device 4, which includes a heater 41 and a Tesla valve 42, and the Tesla valve 42 is arranged inside the heater 41 for heating the Tesla valve 42, thereby heating the raw gas entering the Tesla valve 42. If there is granular solidified raw material in the raw gas and it is brought into the Tesla valve 42 by the raw gas, the solid raw material will also be heated.

[0032] The air inlet of the Tesla valve 42 is connected to the end of the first feeding section away from the raw gas evaporator 1, so as to allow the granular solid raw materials suspended in the raw gas to collide repeatedly in the Tesla valve 42 to reduce the size of the solid raw materials, so that the solid raw materials in the Tesla valve 42 are sublimated into gas under the heating of the heater 41, thereby reducing the granular solid raw materials entering the second feeding section and the sleeve 2.

[0033] The gas outlet of the Tesla valve 42 is connected to the second material conveying section.

[0034] In terms of the overall structure, the pipeline area where the feed pipe 3 is located is located above the raw gas evaporation tank 1. This structure is conducive to the flow of raw gas and the sedimentation of raw material particles.

[0035] The flow rate of the raw material gas in the Tesla valve 42 is 0.1m / s to 0.3m / s. If the flow rate is too fast, the granular solid raw materials will not be fully collided to reduce their size and be heated to sublime; if the flow rate is too slow, the granular solid raw materials will not collide with enough force or only a small amount of solid raw materials will not collide, and there will still be larger granular solid raw materials that will stick to the inner wall of the Tesla valve 42 and enter the feed pipe 3, resulting in the mixing device 4 failing to fully play its role in reducing the particle size and sublimating it.

[0036] Furthermore, the heater 41 surrounds the Tesla valve 42 at 360° so as to uniformly heat the Tesla valve 42, thereby facilitating the sublimation of the granular solid raw materials in the Tesla valve 42, so that the solid raw materials in all directions around the Tesla valve 42 can be heated, thereby preventing the solid raw materials in some places from being not heated and being on the feed pipe 3, thereby further improving the sublimation efficiency of the solid raw materials in the Tesla valve 42.

[0037] Furthermore, the first feed section and the second feed section are both arranged vertically and coaxially, so that larger particles entering the feed pipe 3 and the Tesla valve 42 can fall downwards back into the raw gas evaporator 1 for reheating and sublimation, thereby preventing larger particles from being deposited as residues in the feed pipe and the Tesla valve 42.

[0038] Furthermore, the heater 41 is an electric heater that can be independently temperature controlled. The power of the heater 41 is 200W-300W, which can fully heat and sublimate the granular solidified raw materials, and prevent the adverse effects of excessive temperature on the sublimation of the solid raw materials, such as product loss and product impurity.

[0039] Furthermore, the internal temperature of the Tesla valve 42 is higher than the internal temperature of the raw material evaporator, which prevents the raw gas from the raw material gas evaporator 1 from entering the Tesla valve 42 and condensing into a solid due to a decrease in temperature.

[0040] Furthermore, the feed pipe 3 is placed in the oven 7 so that the oven 7 heats the feed pipe 3 so that the temperature of the feed pipe 3 in the oven 7 is higher than the internal temperature of the raw material evaporator. In this way, multiple feed pipes 3 can be arranged and continuously heated by the oven 7.

[0041] Furthermore, the Tesla valve 42 is a pipeline structure, and has a straight main pipe and a branch pipe connected to the side wall of the straight main pipe. The straight main pipe, the first material conveying section and the second material conveying section are coaxially arranged to facilitate the large-sized particles to fall back into the raw gas evaporator 1 for reheating and sublimation. More preferably, there are multiple branch pipes to allow the granular solid raw materials to fully collide and thus reduce the size of the solid raw materials.

[0042] The present invention arranges a Tesla valve on the feed pipe and heats the Tesla valve with a heater, so that the granular solid raw materials in the raw gas can collide multiple times to reduce the size and heat and sublimate, thereby preventing the feed pipe from being corroded, stabilizing the water peak and loss parameters of the optical fiber, and improving the service life of the equipment and the quality of optical fiber preparation.

[0043] It will be easily understood by those skilled in the art that 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rare earth chelate evaporation device, comprising a raw gas evaporation tank, a sleeve and a feed pipe connecting the raw gas evaporation tank and the sleeve, characterized in that: The feed pipe comprises a first feed section and a second feed section, one end of the first feed section extends into the raw gas evaporation tank to guide out the raw gas formed by sublimation of the powdered solid raw material in the raw gas evaporation tank; The rare earth chelate evaporation device further comprises a mixing device, the mixing device comprises a heater and a Tesla valve, and the Tesla valve is arranged inside the heater to heat the Tesla valve; The air inlet of the Tesla valve is connected to the end of the first material conveying section away from the raw gas evaporation tank, so as to allow the granular solid raw materials suspended in the raw gas to collide repeatedly in the Tesla valve to reduce the size of the solid raw materials, so that the solid raw materials in the Tesla valve are sublimated into gas under the heating of the heater, thereby reducing the granular solid raw materials entering the second material conveying section and the casing; The gas outlet of the Tesla valve is connected to the second material conveying section.

2. The rare earth chelate evaporation device according to claim 1, characterized in that: The heater surrounds the Tesla valve 360° to uniformly heat the Tesla valve, thereby facilitating sublimation of the granular solid raw material in the Tesla valve.

3. The rare earth chelate evaporation device according to claim 1, characterized in that: The flow rate of the raw gas in the Tesla valve is 0.1m / s to 0.3m / s.

4. The rare earth chelate evaporation device according to claim 1, characterized in that: The first feeding section and the second feeding section are both arranged vertically and coaxially.

5. The rare earth chelate evaporation device according to claim 1, characterized in that: The temperature of the carrier gas introduced into the raw material gas evaporation tank is equivalent to the temperature inside the raw material evaporation tank, so as to reduce the influence on the temperature field inside the raw material evaporation tank.

6. The rare earth chelate evaporation device according to claim 1, characterized in that: The heater is an electric heater, and the power of the heater is 200W-300W.

7. The rare earth chelate evaporation device according to claim 1, characterized in that: The internal temperature of the Tesla valve is higher than the internal temperature of the raw material evaporation tank.

8. The rare earth chelate evaporation device according to claim 1, characterized in that: The feed pipe is placed in the oven so that the oven heats the feed pipe so that the temperature of the feed pipe in the oven is higher than the internal temperature of the raw material evaporation tank.

9. The rare earth chelate evaporation device according to claim 1, characterized in that: The Tesla valve is a pipeline structure, and has a straight main pipe and a branch pipe connected to the side wall of the straight main pipe. The straight main pipe, the first material conveying section and the second material conveying section are coaxially arranged.

10. The rare earth chelate evaporation device according to claim 9, characterized in that: There are a plurality of branch pipes for allowing the granular solid raw materials to fully collide so as to reduce the size of the solid raw materials.

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