Rare earth chelate evaporation apparatus

Abstract

The application discloses a rare earth chelate evaporation device, which comprises a raw material gas evaporation tank, a sleeve pipe and a material conveying pipe, wherein the material conveying pipe has a first material conveying section and a second material conveying section; the rare earth chelate evaporation device further comprises a mixing device, and the mixing device comprises a heater and a Tesla valve; the gas inlet of the Tesla valve is connected with one end of the first material conveying section, so that the granular solid raw material suspended in the raw material gas repeatedly collides in the Tesla valve to reduce the size of the solid raw material, and the solid raw material in the Tesla valve sublimates into gas under the heating of the heater. The granular small solid raw material suspended in the raw material gas repeatedly collides in the Tesla valve to reduce the size of the granular small solid raw material, and the heater outside the Tesla valve simultaneously heats the solid raw material in the Tesla valve, so that the solid raw material in the Tesla valve can quickly sublimate into gas, and the suspended granular small solid raw material in the raw material gas can be reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical fiber production equipment, and more particularly to a rare earth chelate evaporation equipment. BACKGROUND

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

[0003] At present, several common techniques for rare earth ion doping 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 fiber, the rare earth ion doping method is to adopt a single doping technology, among which the most widely used is high-temperature gas phase doping technology and solution immersion technology.

[0004] CN202410311357.5 discloses a gas-liquid composite doping equipment for preparing rare earth doped optical fiber, which comprises a chelate feeding pipe, the chelate feeding pipe comprising a sleeve pipe and a plurality of feeding pipes, a process gas container, an oven, a rare earth solution storage tank, a circulating water cooling device, and a raw material gas evaporation tank. A plurality of first gas outlet pipes and a second gas outlet pipe are connected to the process gas container. A second gas outlet pipe and a liquid feeding pipe are inserted into the rare earth solution storage tank. The liquid feeding pipe passes through the circulating water cooling device to allow the circulating water cooling device to water cool the liquid feeding pipe, so that the temperature of the rare earth solution flowing into the liner pipe is maintained within a set range. This technology can classify and temperature control the raw materials input into the liner pipe. The gas phase doping raw materials are heated by oil bath, and the liquid phase doping can be cooled by water cooling to prevent gas and liquid from affecting each other. The doping of the raw materials on the inner wall of the liner pipe can be realized on the same lathe. However, the above-mentioned gas-liquid composite doping equipment has some solid raw materials with strong acid corrosion after absorbing water, which causes the feeding pipe to be frequently corroded, resulting in safety hazards, and the water peak and attenuation parameters of the prepared optical fiber are unstable, which makes the quality of the prepared optical fiber not high or the rate of defective products high. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a rare earth chelate evaporation equipment, wherein the Tesla valve of the mixing device can make the raw material vapor repeatedly collide with the particles in the cavity of the mixing device, so that the fine particles can finally sublimate into gas, reducing the residual material formed by the fine raw material particles in the feeding pipe and the instability of the water peak and attenuation parameters of the optical fiber caused by the fine raw material particles in the liner pipe.

[0006] To achieve the above-mentioned purpose, according to the present application, a rare earth chelate evaporation equipment is provided, which comprises a raw material gas evaporation tank, a sleeve pipe, and a feeding pipe connecting the raw material gas evaporation tank and the sleeve pipe, characterized in that,

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

[0009] The gas inlet of the Tesla valve is connected to one end of the first feed section away from the raw material gas evaporation tank, for allowing the particulate solid raw material suspended in the raw material gas to collide repeatedly in the Tesla valve to reduce the size of the solid raw material, so that the solid raw material in the Tesla valve sublimates into gas under the heating of the heater, thereby reducing the particulate solid raw material entering the second feed section and the sleeve;

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

[0011] Preferably, the heater surrounds the Tesla valve by 360° for uniformly heating the Tesla valve to facilitate the sublimation of the particulate solid raw material in the Tesla valve.

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

[0013] Preferably, the first feed section and the second feed 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 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 200 W to 300 W.

[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 to heat the feed pipe by the oven 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 of a pipe structure and has a straight main pipe and branch pipes connected to the side wall of the straight main pipe, and the straight main pipe, the first feed section and the second feed section are coaxially arranged.

[0019] Preferably, the branch pipes are multiple for allowing the particulate solid raw material to collide sufficiently to reduce the size of the solid raw material.

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

[0021] 1) The rare earth chelate evaporation device of the present application uses a Tesla valve, which allows the particulate small solid raw materials in the raw material gas to repeatedly collide in the Tesla valve to reduce their size, and at the same time, a heater outside the Tesla valve is used to heat the solid raw materials in the Tesla valve, so that the solid raw materials in the Tesla valve can be quickly sublimed into gas, thereby reducing the presence of suspended particulate small solid raw materials in the raw material gas, preventing the solid raw materials from adhering to the inner walls of the feed pipe and the sleeve to form scale, greatly eliminating the hidden dangers of some scale with strong water absorption and strong acid after water absorption remaining on the feed pipe and the sleeve to corrode the feed pipe and the valve, as well as the hidden dangers of unstable parameters such as water peak and attenuation of optical fibers caused by particulate solid raw materials entering the liner tube for burning optical fibers from the sleeve, thereby improving the stability and safety of optical fiber production.

[0022] 2) The rare earth chelate evaporation device of the present application has an independent heater outside the Tesla valve to uniformly heat the Tesla valve, so that the solid raw materials in all directions of the Tesla valve can be heated, preventing some solid raw materials from not being heated and adhering to the feed pipe, thereby further improving the sublimation efficiency of the solid raw materials in the Tesla valve. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application;

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

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0026] In the gas-liquid phase composite doping equipment for preparing rare-earth-doped optical fibers described in patent CN202410311357.5, the feed pipe 3 and sleeve 2 are filled with raw material gas during the high-temperature gas phase doping process. The main reason why the feed pipe 3 and sleeve 2 are often corroded is often attributed to the corrosiveness of the raw material gas. Therefore, the conventional solution is to use non-corrosive solid raw materials inside the raw material gas evaporator. However, this reduces the types of rare earths that can be doped and the types of rare-earth-doped optical fibers that can be prepared, thus limiting the production scale.

[0027] However, practical experience has shown that the main cause of corrosion in the feed pipe is the absorption of water by solid particles of the raw material adhering to the inside of the pipe. Simultaneously, when these solid particles adhere to the precision shut-off valves on the feed pipe, they cause incomplete valve closure, leading to unstable concentrations of adulterants.

[0028] This invention does not change the type of solid raw material. Starting from the particulate solid raw material in the raw material gas, it aims to reduce or even eliminate the particulate solid raw material in the raw material gas, so that the sublimation of the solid raw material reduces the impact on the feed pipe 3, the sleeve 2 and the precision shut-off valve, while not affecting 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 includes a raw material gas evaporator 1, a sleeve 2, and a feed pipe 3 connecting the raw material gas evaporator 1 and the sleeve 2. The structure of the raw material gas evaporator 1, the sleeve 2, and the feed pipe 3 can be found in patent CN202410311357.5, "A gas-liquid phase composite doping device for preparing rare earth-doped optical fibers," and will not be described in detail here.

[0030] The conveying pipe 3 has a first conveying section and a second conveying section. One end of the first conveying section extends into the raw material gas evaporator 1 to extract the raw material gas formed by the sublimation of the powdered solid raw material in the raw material gas evaporator 1. The powdered solid raw material in the raw material gas evaporator 1, after heating, can sublimate into raw material gas, which is then expelled by a carrier gas introduced into the raw material gas evaporator 1. The raw material gas and the carrier gas enter the first conveying section together. Preferably, the temperature of the carrier gas introduced into the raw material gas evaporator 1 is similar to the internal temperature of the raw material evaporator to reduce the impact on the temperature field inside the raw material evaporator. The carrier gas is preferably an inert gas. The carrier gas storage tank 5 contains compressed carrier gas, which is introduced into the raw material gas evaporator 1 through the carrier gas pipe 6 to expel the raw material gas.

[0031] The rare earth chelate evaporation device further comprises a mixing device 4, the mixing device 4 comprises a heater 41 and a Tesla valve 42, and the Tesla valve 42 is arranged inside the heater 41 and is heated by the heater 41, so that the raw material gas entering the Tesla valve 42 is heated, and if the raw material gas carries the particulate solid raw material into the Tesla valve 42, the solid raw material is also heated.

[0032] The gas inlet of the Tesla valve 42 is connected to one end of the first conveying section away from the raw material gas evaporation tank 1, so that the particulate solid raw material suspended in the raw material gas repeatedly collides in the Tesla valve 42 to reduce the size of the solid raw material, so that the solid raw material in the Tesla valve 42 sublimates into gas under the heating of the heater 41, thereby reducing the particulate solid raw material entering the second conveying section and the sleeve 2.

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

[0034] Overall, the pipeline area where the conveying pipe 3 is located is above the raw material gas evaporation tank 1, which is beneficial to the flow of the raw material gas and the settlement of the raw material particles.

[0035] The flow rate of the raw material gas in the Tesla valve 42 is 0.1 m / s to 0.3 m / s. If the flow rate is too fast, the particulate solid raw material cannot be fully collided and reduced in size and heated to sublimate; if the flow rate is too slow, the particulate solid raw material cannot be fully collided or only a small amount of the particulate solid raw material is collided, and a large amount of the particulate solid raw material will travel along the inner wall of the Tesla valve 42 and enter the conveying pipe 3, so that the mixing device 4 cannot fully play the role of reducing the size of the particles and sublimation.

[0036] Further, the heater 41 surrounds the Tesla valve 42 by 360°, so as to uniformly heat the Tesla valve 42, facilitate the sublimation of the particulate solid raw material in the Tesla valve 42, and prevent some of the particulate solid raw material from not being heated and entering the conveying pipe 3, thereby further improving the sublimation efficiency of the particulate solid raw material in the Tesla valve 42.

[0037] Further, the first conveying section and the second conveying section are vertically arranged and coaxially arranged, so as to facilitate the larger particles entering the conveying pipe 3 and the Tesla valve 42 to fall back into the raw material gas evaporation tank 1 for re-heating and sublimation, and prevent the larger particles from being deposited as residues in the conveying pipe and the Tesla valve 42.

[0038] Further, the heater 41 is an electric heater, and can be independently temperature-controlled. The power of the heater 41 is 200-300 W, which can sufficiently heat and sublimate the granular solid raw material, and prevent the adverse effects such as product loss and impurity caused by excessive temperature of the solid raw material.

[0039] Further, the internal temperature of the Tesla valve 42 is higher than that of the raw material evaporation tank, which prevents the raw material gas from the raw material gas evaporation tank 1 from entering the Tesla valve 42 and condensing into solid due to the decrease of the internal temperature of the Tesla valve 42.

[0040] Further, the material conveying pipe 3 is placed in the oven 7, so that the oven 7 heats the material conveying pipe 3, and the temperature of the material conveying pipe 3 in the oven 7 is higher than that of the raw material evaporation tank. In this way, multiple material conveying pipes 3 can be arranged, and the oven 7 can continuously heat these material conveying pipes 3.

[0041] Further, the Tesla valve 42 is in a pipe structure, and has a straight main pipe and branch pipes 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, which facilitates the larger granular solid raw material to fall back into the raw material gas evaporation tank 1 and be heated and sublimated again. More preferably, the branch pipes are multiple, which can sufficiently collide the granular solid raw material and reduce the size of the solid raw material.

[0042] The present application can reduce the size of the granular solid raw material in the raw material gas by multiple collisions and heat and sublimate the solid raw material by arranging the Tesla valve on the material conveying pipe and heating the Tesla valve with the heater, which can prevent the corrosion of the material conveying pipe, stabilize the water peak of the optical fiber, the loss parameter, improve the service life of the equipment and the quality of the optical fiber preparation.

[0043] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rare earth chelate evaporation device, comprising a raw material gas evaporator, a casing, and a feed pipe connecting the raw material gas evaporator and the casing, characterized in that, The conveying pipe has a first conveying section and a second conveying section. One end of the first conveying section extends into the raw material gas evaporator to extract the raw material gas formed by the sublimation of powdered solid raw materials in the raw material gas evaporator. The rare earth chelate evaporation equipment also includes a mixing device, which includes a heater and a Tesla valve, and the Tesla valve is installed inside the heater for heating the Tesla valve. The air inlet of the Tesla valve is connected to the end of the first conveying section away from the raw material gas evaporator. This allows the suspended particulate solid raw materials in the raw material gas to collide repeatedly inside the Tesla valve to reduce the size of the solid raw materials. This allows the solid raw materials inside the Tesla valve to sublimate into gas under the heating of the heater, thereby reducing the amount of particulate solid raw materials entering the second conveying section and the sleeve. The outlet of the Tesla valve is connected to the second conveying section.

2. The rare earth chelate evaporation equipment according to claim 1, characterized in that, The heater surrounds the Tesla valve 360° to uniformly heat the Tesla valve, facilitating the sublimation of granular solid materials inside the Tesla valve.

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

4. The rare earth chelate evaporation equipment according to claim 1, characterized in that, The first and second conveying sections are both arranged vertically and are coaxially arranged.

5. The rare earth chelate evaporation equipment according to claim 1, characterized in that, The temperature of the carrier gas introduced into the raw gas evaporator is similar to the temperature inside the raw gas evaporator, so as to reduce the impact on the temperature field inside the raw gas evaporator.

6. The rare earth chelate evaporation equipment according to claim 1, characterized in that, The heater is an electric heater with a power of 200W to 300W.

7. The rare earth chelate evaporation equipment according to claim 1, characterized in that, The internal temperature of the Tesla valve is higher than the internal temperature of the raw gas evaporator.

8. The rare earth chelate evaporation equipment according to claim 1, characterized in that, The feed pipe is placed inside the oven so that the oven heats the feed pipe, thereby making the temperature of the feed pipe inside the oven higher than the internal temperature of the raw material gas evaporator.

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

10. The rare earth chelate evaporation equipment according to claim 9, characterized in that, The branch pipe has multiple branches to allow the granular solid raw materials to collide fully, thereby reducing the size of the solid raw materials.

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