Deuterium gas treatment system for optical fiber

Abstract

The utility model discloses a deuterium gas treatment system for an optical fiber. The deuterium gas treatment system comprises a deuterium gas treatment box and heating equipment, a partition plate is arranged at the lower part of the deuterium gas treatment box and divides the interior of the deuterium gas treatment box into an upper cavity and a lower cavity; mixed gas of deuterium gas and nitrogen gas is stored in the upper cavity, and heating equipment is mounted in the lower cavity; a plurality of heat dissipation holes communicated with the upper cavity and the lower cavity are formed in the partition plate; the deuterium gas is stored in the upper cavity; the heating equipment is arranged in the lower cavity; the heating equipment comprises a heating pipe, a water inlet pipe and a water outlet pipe; the heating pipe is laid in the lower cavity, and cooling fins are arranged on the heating pipe in the axis direction at intervals. The deuterium gas treatment device has the beneficial effects that the deuterium gas is heated by utilizing the heating equipment, so that the temperature stability of a deuterium gas treatment space is ensured, the deuterium gas treatment space is not influenced by the environment, the deuterium gas treatment effect is effectively ensured, and the deuterium gas consumption can be reduced under the same treatment time; the heating pipe and the cooling fins are adopted for heating, and the heating mode can guarantee continuous and stable operation of deuterium gas treatment of the optical fiber.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber preparation, in particular to a deuterium gas processing system for optical fiber. Background Art

[0002] The basic principle of optical fiber signal transmission is the total reflection process of light. Therefore, when the optical signal passes through the optical fiber, the attenuation performance is a key indicator to measure the quality of the optical fiber. Since the essence of the optical fiber is SiO2, the Si-O free radical easily forms a Si-OH group with hydrogen in the hydrogen-containing environment. This group forms a permanent absorption peak in the communication window 1383, which leads to an increase in the additional attenuation of the optical fiber in this band. In order to reduce the attenuation loss in the 1383nm band, the optical fiber needs to be treated with deuterium gas after production, that is, the optical fiber (or optical fiber preform) is placed in a deuterium-rich environment. The principle of deuterium gas treatment is: Si-O is more likely to form a Si-OD group with the D atom in the deuterium gas molecule. The molecular bond energy of the Si-OD group is higher than that of Si-OH, and the molecule is more stable than Si-OH, and its attenuation absorption peak is not in the optical fiber communication window. Therefore, the deuterium treatment of the optical fiber can ensure the hydrogen corrosion resistance of the optical fiber in long-term use.

[0003] Since deuterium is a heavier stable isotope of ordinary hydrogen, deuterium gas, like hydrogen, is a highly dangerous flammable and explosive gas. The existing technology uses a deuterium-nitrogen mixed gas to treat optical fibers with deuterium gas under normal temperature and pressure in a confined space. The deuterium gas treatment time is long and the deuterium gas treatment temperature is uncontrollable, especially in winter when the ambient temperature drops, making it difficult to ensure the deuterium gas treatment effect. In order to ensure the deuterium gas treatment effect, the common method is to extend the deuterium gas treatment time or increase the deuterium gas concentration. Therefore, improving the deuterium gas treatment effect of optical fibers and reducing the amount of deuterium gas used are also urgent issues to be solved in the field of optical fiber preparation. Summary of the invention

[0004] The utility model aims to provide a deuterium treatment system for optical fiber in view of the shortcomings of the prior art, so as to improve the deuterium treatment effect of optical fiber and reduce the usage of deuterium.

[0005] The technical solution adopted by the utility model is: a deuterium gas processing system for optical fiber, comprising a deuterium gas processing box and a heating device;

[0006] A partition is provided at the lower part of the deuterium gas treatment box, and the partition divides the interior of the deuterium gas treatment box into an upper cavity and a lower cavity; a mixed gas of deuterium gas and nitrogen gas is stored in the upper cavity, and a heating device is installed in the lower cavity; a plurality of heat dissipation holes connecting the upper cavity and the lower cavity are opened on the partition; deuterium gas is stored in the upper cavity; and the heating device is arranged in the lower cavity;

[0007] The heating equipment includes a heating pipe, a water inlet pipe and a water outlet pipe; the heating pipe is laid in the lower cavity, and heat sinks are arranged at intervals along the axial direction of the heating pipe; the outlet end of the water inlet pipe passes through the deuterium gas treatment box and enters the lower cavity, and is connected with the inlet of the heating pipe; the inlet end of the water outlet pipe is connected with the outlet of the heating pipe located in the lower cavity, and the outlet end of the water outlet pipe passes through the deuterium gas treatment box.

[0008] According to the above solution, the heating pipes are arranged in a serpentine shape in the lower cavity.

[0009] According to the above scheme, the temperature of the hot water in the heating pipe is 35-45°C.

[0010] According to the above scheme, an explosion-proof fan is installed in the upper cavity.

[0011] According to the above solution, a plurality of first temperature detection devices are arranged in the upper cavity.

[0012] According to the above solution, a second temperature detection device and a regulating valve are provided on the water inlet pipe.

[0013] According to the above solution, the inner wall of the deuterium gas treatment box is covered with a first thermal insulation layer.

[0014] According to the above solution, the section of the water inlet pipe located outside the deuterium gas treatment box is wrapped with a second insulation layer.

[0015] According to the above solution, the partition is made of steel plate; holes are densely opened on the steel plate as heat dissipation holes.

[0016] According to the above solution, the deuterium gas treatment box is rectangular as a whole.

[0017] The beneficial effects of the utility model are:

[0018] 1. The utility model sets a heating device at the inner bottom of the deuterium gas treatment box, uses the heating device to heat the deuterium gas, ensures the temperature stability of the deuterium gas treatment space, is not affected by the environment, effectively ensures the deuterium gas treatment effect, and can reduce the amount of deuterium gas used under the same treatment time; adopts heating pipes and heat sinks for heating, and this heating method can ensure the continuous and stable operation of the optical fiber deuterium gas treatment; a partition is set between the upper cavity for storing deuterium gas and the lower cavity of the heating device, and heat dissipation holes are opened on the partition. This design can improve the uniformity of heating and make the deuterium gas heated evenly.

[0019] 2. The utility model sets a first temperature detection device in the deuterium gas treatment box to detect the deuterium gas temperature, and uses a regulating valve on the water inlet pipe to adjust the flow of hot water entering the heating pipe to make the deuterium gas temperature reach a set temperature range. This design is flexible, reliable and easy to operate.

[0020] 3. The utility model provides an explosion-proof fan in the deuterium gas treatment box to promote the flow, mixing and heat conduction process of the gas.

[0021] 4. The utility model covers the inner wall of the deuterium gas treatment box with a first insulation layer, which can reduce the heat loss in the box; and wraps the second insulation layer outside the water inlet pipe, which can reduce the heat loss of hot water in the water inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.

[0023] Figure 2 Schematic diagram of the arrangement of heating pipes in this embodiment.

[0024] Among them: 1. Deuterium gas treatment box; 1.1. First temperature detection device; 1.2. Explosion-proof fan; 1.3. Partition; 2. Heating pipe; 3. Water inlet pipe; 3.1. Second temperature detection device; 3.3. Regulating valve; 4. Water outlet pipe. DETAILED DESCRIPTION

[0025] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 1 and Figure 2 A deuterium gas processing system for optical fiber shown includes a deuterium gas processing box 1 and a heating device;

[0027] A partition 1.3 is provided at the lower part of the deuterium gas treatment box 1, and the partition 1.3 divides the interior of the deuterium gas treatment box 1 into an upper cavity and a lower cavity; a mixed gas of deuterium gas and nitrogen gas is stored in the upper cavity, and a heating device is installed in the lower cavity; a plurality of heat dissipation holes connecting the upper cavity and the lower cavity are opened on the partition 1.3; the deuterium gas is stored in the upper cavity; and the heating device is arranged in the lower cavity;

[0028] The heating equipment includes a heating pipe 2, a water inlet pipe 3 and a water outlet pipe 4; the heating pipe 2 is laid in the lower cavity, and heat sinks are arranged at intervals along the axial direction of the heating pipe 2; the outlet end of the water inlet pipe 3 passes through the deuterium gas treatment box 1 and enters the lower cavity, and is connected with the inlet of the heating pipe 2; the inlet end of the water outlet pipe 4 is connected with the outlet of the heating pipe 2 located in the lower cavity, and the outlet end of the water outlet pipe 4 passes through the deuterium gas treatment box 1; hot water enters the heating pipe 2 through the water inlet pipe 3 and flows out from the water outlet pipe 4.

[0029] In the utility model, a heating device is arranged at the inner bottom of a deuterium gas treatment box 1, and the deuterium gas is heated by the heating device, which can effectively ensure the deuterium gas treatment effect; heating is performed by a heating pipe 2 and a heat sink, and this heating method can ensure the temperature stability of the deuterium gas treatment space and is not affected by the environment; a partition 1.3 is arranged between an upper cavity for storing deuterium gas and a lower cavity of the heating device, and heat dissipation holes are provided on the partition 1.3. This design can improve the uniformity of heating and make the deuterium gas heated evenly.

[0030] In the utility model, the heating pipes 2 are arranged in a serpentine shape in the lower cavity.

[0031] In the utility model, the deuterium gas processing box 1 is rectangular as a whole, and the deuterium gas processing box 1 is also provided with a box door; rubber seals are respectively used at the holes of the water inlet pipe 3 and the water outlet pipe 4, as well as at the connection of the box door, so as to ensure the airtightness of the deuterium gas storage box and avoid deuterium gas leakage.

[0032] In the utility model, the partition plate 1.3 is made of steel plate and is used as a bearing plate for the optical fiber; holes are densely opened on the steel plate as heat dissipation holes.

[0033] In the utility model, hot water flows in the heating pipe 2 ; the water inlet pipe 3 provides hot water for the heating pipe 2 , and the water outlet pipe 4 is used to discharge the water in the heating pipe 2 .

[0034] Preferably, the temperature of the hot water in the heating pipe 2 is 35-45°C.

[0035] Since the protective layer on the surface of the optical fiber is made of polyacrylic acid resin material, and deuterium is a flammable and explosive gas, the heating temperature of deuterium cannot exceed 50°C. If the temperature is too low, the diffusion rate of deuterium molecules will be limited and the heating purpose cannot be achieved. Therefore, the heating temperature is preferably maintained at 35-45°C.

[0036] Preferably, an explosion-proof fan 1.2 is installed in the upper cavity; specifically, explosion-proof fans 1.2 are respectively arranged at the top and the bottom of the upper cavity.

[0037] In the utility model, the explosion-proof fan 1.2 can be arranged at the bottom center or the top center of the upper cavity; the explosion-proof fan 1.2 can be used to accelerate heat mixing and promote uniform mixing of gas molecules.

[0038] Preferably, a plurality of first temperature detection devices 1.1 are arranged in the upper cavity.

[0039] In the present invention, there are four first temperature detection devices 1.1, which are respectively arranged at the top and bottom of the upper cavity at opposite corners, such as Figure 1 The first temperature detection device 1.1 can be used to detect the temperature of the gas in the upper cavity.

[0040] Preferably, the water inlet pipe 3 is provided with a second temperature detection device 3.1 and a regulating valve 3.2.

[0041] In the present invention, the second temperature detection device 3.1 is used to detect the water temperature of the water entering the heating pipe 2; the water flow regulating valve 3.2 is used to regulate the water flow entering the heating pipe 2.

[0042] Preferably, the inner wall of the deuterium gas treatment box 1 is covered with a first thermal insulation layer, and the first thermal insulation layer is made of aluminum silicate thermal insulation cotton.

[0043] In the utility model, the design of the first heat-insulating layer can reduce the heat loss in the box.

[0044] Preferably, the pipe section of the water inlet pipe 3 located outside the deuterium gas treatment box 1 is wrapped with a second thermal insulation layer, and the second thermal insulation layer is made of foam material.

[0045] In the utility model, the design of the second heat-insulating layer can reduce the heat loss of hot water in the water inlet pipe 3 .

[0046] The process of using the utility model to treat optical fiber with deuterium is as follows:

[0047] The optical fiber is placed on the partition 1.3 of the deuterium gas treatment box 1, and a mixed gas of deuterium and nitrogen is introduced into the deuterium gas treatment box 1. The heating pipe 2 is laid on the bottom layer of the deuterium gas treatment box 1, and a layer of steel plate with densely arranged small holes is added on it as the partition 1.3. Hot water flows through the heating pipe 2, and the heat is dissipated to the environment inside the deuterium gas treatment box 1 through the heat sink to heat the deuterium and nitrogen mixed gas in the box; the first temperature detection device 1.1 in the box detects the temperature of the gas; when the temperature of the gas in the box exceeds the set temperature range, the hot water flow entering the heating pipe 2 can be reduced by the regulating valve 3.2; when the temperature of the gas in the box is lower than the set temperature range, the hot water flow entering the heating pipe 2 can be increased by the regulating valve 3.2 to ensure the stability of the temperature in the deuterium gas treatment box 1.

[0048] According to actual production verification, when the deuterium gas treatment system of the utility model is used to treat optical fiber, if the deuterium gas treatment time remains unchanged, the deuterium gas concentration is reduced by more than 30%, and the specific reduction value is based on the deuterium gas treatment effect; if the deuterium gas concentration remains unchanged, the deuterium gas treatment time can be shortened by more than 30%, and the specific shortening time is based on the deuterium gas treatment effect.

[0049] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0050] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, 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 deuterium gas processing system for optical fiber, characterized in that: Includes deuterium gas handling box and heating equipment; A partition is provided at the lower part of the deuterium gas treatment box, and the partition divides the interior of the deuterium gas treatment box into an upper cavity and a lower cavity; a mixed gas of deuterium gas and nitrogen gas is stored in the upper cavity, and a heating device is installed in the lower cavity; a plurality of heat dissipation holes connecting the upper cavity and the lower cavity are opened on the partition; deuterium gas is stored in the upper cavity; and the heating device is arranged in the lower cavity; The heating equipment includes a heating pipe, a water inlet pipe and a water outlet pipe; the heating pipe is laid in the lower cavity, and heat sinks are arranged at intervals along the axial direction of the heating pipe; the outlet end of the water inlet pipe passes through the deuterium gas treatment box and enters the lower cavity, and is connected with the inlet of the heating pipe; the inlet end of the water outlet pipe is connected with the outlet of the heating pipe located in the lower cavity, and the outlet end of the water outlet pipe passes through the deuterium gas treatment box.

2. The deuterium gas processing system according to claim 1, characterized in that: The heating pipes are arranged in a serpentine shape in the lower cavity.

3. The deuterium gas processing system according to claim 1 or 2, characterized in that: The temperature of the hot water in the heating pipe is 35-45°C.

4. The deuterium gas processing system according to claim 3, characterized in that: An explosion-proof fan is installed in the upper cavity.

5. The deuterium gas processing system according to claim 4, characterized in that: A plurality of first temperature detection devices are arranged in the upper cavity.

6. The deuterium gas processing system according to claim 4 or 5, characterized in that: The water inlet pipe is provided with a second temperature detection device and a regulating valve.

7. The deuterium gas processing system according to claim 1, characterized in that: The inner wall of the deuterium gas treatment box is covered with a first thermal insulation layer.

8. The deuterium gas processing system according to claim 1, characterized in that: The pipe section of the water inlet pipe located outside the deuterium gas processing box is wrapped with a second thermal insulation layer.

9. The deuterium gas processing system according to claim 1, characterized in that: The partition is made of a steel plate; holes are densely opened on the steel plate as heat dissipation holes.

10. The deuterium gas processing system according to claim 1, characterized in that: The deuterium gas processing box is rectangular in shape as a whole.

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