Optical fiber protection device, hydrogen storage cylinder and manufacturing method

Abstract

The invention discloses an optical fiber protection device, a hydrogen storage cylinder and a manufacturing method, and relates to the technical field of high-pressure hydrogen storage, and the optical fiber protection device comprises an inner-layer protection shell, an outer-layer protection shell, a flexible filling layer and a monitoring optical fiber. The inner-layer protective shell fixedly sleeves the outer side of the hydrogen storage cylinder and is provided with at least one inner-layer optical fiber channel; the outer-layer protective shell is fixedly arranged on the outer side of the inner-layer protective shell in a sleeving manner and is provided with at least one outer-layer optical fiber channel, the outer-layer optical fiber channel and the inner-layer optical fiber channel are arranged on the outer side of the hydrogen storage cylinder in a staggered manner, and a filling gap is formed between the inner side wall of the outer-layer protective shell and the outer side wall of the inner-layer protective shell; the filling gap is respectively communicated with the inner-layer optical fiber channel and the outer-layer optical fiber channel; the flexible filling layer is filled in the filling gap, the inner-layer optical fiber channel and the outer-layer optical fiber channel and plays roles in protecting, buffering and flexibly fixing; at least one monitoring optical fiber is wound and embedded in the flexible filling layer, and the two ends of the monitoring optical fiber are arranged in the inner-layer optical fiber channel and the outer-layer optical fiber channel respectively.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure hydrogen storage, in particular to an optical fiber protection device, a hydrogen storage cylinder and a manufacturing method. Background Art

[0002] At present, hydrogen energy is an important part of the future national energy system. High-pressure gaseous hydrogen storage has attracted widespread attention due to its advantages such as high hydrogen storage density, fast hydrogen charging and discharging speed, low energy consumption and cost, and wide operating temperature range. Among them, the safety of high-pressure hydrogen storage cylinders is directly related to the safety of people's lives and property, social stability, and the future development of hydrogen energy.

[0003] Among them, fiber optic sensing monitoring technology can be used to conduct real-time monitoring and safety warning of hydrogen storage cylinders during the rapid filling and discharging of hydrogen storage cylinders and the entire life cycle of the use of hydrogen storage cylinders due to its advantages of small size, light weight, anti-electromagnetic interference, corrosion resistance, high sensitivity, wide bandwidth, long detection interval and the ability to form a monitoring network matrix.

[0004] At present, the introduction of monitoring optical fiber in hydrogen storage cylinders is often done by fixing the fiber grating at the designed position before winding the fiber, then winding the monitoring optical fiber onto the cylinder, and finally burying the monitoring optical fiber into the cylinder winding layer by winding the fiber. For subsequent optical fiber connection, a longer section of optical fiber is generally left at the lead-out end of the monitoring optical fiber. Due to the lack of a suitable protective device, the lead-out section of the optical fiber is mainly fixed by bonding or directly hung at the bottle mouth. However, weak bonding and hanging will greatly increase the possibility of accidental damage to the lead-out section of the optical fiber. For this reason, a protective device for monitoring optical fiber in hydrogen storage cylinders is urgently needed. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an optical fiber protection device, a hydrogen storage cylinder and a manufacturing method.

[0006] According to a first aspect of an embodiment of the present invention, an optical fiber protection device comprises: An inner protective shell is fixedly sleeved on the outer side of the hydrogen storage cylinder, and the inner protective shell is provided with at least one inner optical fiber channel penetrating the inner side wall and the outer side wall of the inner protective shell; An outer protective shell is fixedly sleeved on the outer side of the inner protective shell, the outer protective shell is provided with at least one outer optical fiber channel penetrating the inner side wall and the outer side wall of the outer protective shell, the outer optical fiber channel and the inner optical fiber channel are staggered on the outer side of the hydrogen storage cylinder, a filling gap is provided between the inner side wall of the outer protective shell and the outer side wall of the inner protective shell, and the filling gap is respectively connected with the inner optical fiber channel and the outer optical fiber channel; A flexible filling layer, which is filled in the filling gap, the inner optical fiber channel and the outer optical fiber channel; At least one monitoring optical fiber is provided. The monitoring optical fiber is wound and embedded in the flexible filling layer. Two ends of the monitoring optical fiber are respectively arranged in the inner optical fiber channel and the outer optical fiber channel.

[0007] An optical fiber protection device according to an embodiment of the present invention has at least the following beneficial effects: The two ends of the monitoring optical fiber led out from the hydrogen storage cylinder pass through the inner optical fiber channel and the outer optical fiber channel respectively. The outer protective shell and the inner protective shell protect the led-out monitoring optical fiber part. The flexible filling layer fills the filling gap between the outer protective shell and the inner protective shell, the inner optical fiber channel and the outer optical fiber channel, so that the led-out monitoring optical fiber is wrapped by the flexible filling layer. The flexible filling layer plays a further buffering and protective role and a flexible fixing role for the led-out monitoring optical fiber, which reduces the impact of the outside world on the led-out monitoring optical fiber. At the same time, it avoids the led-out monitoring optical fiber from shaking and causing breakage and failure, effectively reducing the possibility of accidental damage to the led-out monitoring optical fiber, and improving the safety and stability of the monitoring optical fiber.

[0008] According to some embodiments of the present invention, the flexible filling layer is made of foam material.

[0009] According to some embodiments of the present invention, the inner protective shell and the outer protective shell are both hemispherical shell structures, a through hole is provided at the center of the outer protective shell, and a connecting hole is provided at the center of the inner protective shell, and the connecting hole is arranged opposite to the through hole.

[0010] According to some embodiments of the present invention, the connection hole is coaxially provided with a threaded connection sleeve, the inner peripheral wall of the threaded connection sleeve is provided with an internal thread, and the threaded connection sleeve is sleeved on the through hole.

[0011] According to some embodiments of the present invention, a connecting buckle structure is provided at the edge of the outer protective shell, and the connecting buckle structure is used to be snap-fitted with the edge of the inner protective shell.

[0012] According to some embodiments of the present invention, the connecting buckle structure is provided with a plurality of buckle bodies, and the plurality of buckle bodies are arranged in a ring-shaped manner and spaced apart.

[0013] According to some embodiments of the present invention, the outer optical fiber channel is provided with a flange connector, and one end of the monitoring optical fiber is connected to the flange connector.

[0014] According to some embodiments of the present invention, the inner optical fiber channel is provided with a plurality of monitoring optical fibers, and the plurality of monitoring optical fibers pass through one inner optical fiber channel and are connected through one flange joint, and the flange joint is provided with a protective cover.

[0015] A hydrogen storage cylinder according to a second aspect of an embodiment of the present invention comprises: In the above-mentioned optical fiber protection device and gas cylinder body, the inner protective shell is sleeved on the end of the gas cylinder body, and the monitoring optical fiber is located at one end of the inner optical fiber channel and connected to the gas cylinder body.

[0016] The manufacturing method according to the third aspect of the embodiment of the present invention is applicable to the hydrogen storage cylinder, and the manufacturing method comprises: The inner protective shell and the outer protective shell are obtained by injection molding or compression molding; Pass the monitoring optical fiber led out from the gas cylinder body through the inner optical fiber channel; The inner protective shell is sleeved on one end of the gas cylinder body to complete the installation and fixation of the inner protective shell; Leading the end of the monitoring optical fiber out from the outer optical fiber channel; The outer protective shell is placed on the outer side of the inner protective shell to form a filling gap; Adjusting the position of the monitoring optical fiber in the filling gap so that the excess length of the monitoring optical fiber is wound around the outer side of the inner protective shell; A flexible filling material is injected into the filling gap, the inner optical fiber channel, and the outer optical fiber channel to obtain a flexible filling layer, and the monitoring optical fiber is fixed.

[0017] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A cross-sectional view of an embodiment of an optical fiber protection device provided by the present invention; Figure 2 A cross-sectional view of an inner protective shell of an optical fiber protection device provided by the present invention; Figure 3 A top view of an inner protective shell of an optical fiber protection device provided by the present invention; Figure 4 A cross-sectional view of an outer protective shell of an optical fiber protection device provided by the present invention; Figure 5 A top view of an outer protective shell of an optical fiber protection device provided by the present invention; Figure 6 A cross-sectional view of a flexible filling layer of an optical fiber protection device provided by the present invention; Figure 7 A top view of a flexible filling layer of an optical fiber protection device provided by the present invention; Figure 8 A schematic diagram of a manufacturing method provided by the present invention and an embodiment thereof; Figure Number: Inner protective shell 100; connection hole 110; threaded connection sleeve 120; inner optical fiber channel 130; Outer protective shell 200; through hole 210; connecting buckle structure 220; outer optical fiber channel 230; flange connector 240; Flexible filling layer 300; Monitoring optical fiber 400; Gas cylinder body 500. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0024] At present, hydrogen energy is an important part of the future national energy system. High-pressure gaseous hydrogen storage has attracted widespread attention due to its advantages such as high hydrogen storage density, fast hydrogen charging and discharging speed, low energy consumption and cost, and wide operating temperature range. Among them, the safety of high-pressure hydrogen storage cylinders is directly related to the safety of people's lives and property, social stability, and the future development of hydrogen energy.

[0025] Among them, fiber optic sensing monitoring technology can be used to conduct real-time monitoring and safety warning of hydrogen storage cylinders during the rapid filling and discharging of hydrogen storage cylinders and the entire life cycle of the use of hydrogen storage cylinders due to its advantages of small size, light weight, anti-electromagnetic interference, corrosion resistance, high sensitivity, wide bandwidth, long detection interval and the ability to form a monitoring network matrix.

[0026] At present, the introduction of the monitoring optical fiber 400 in the hydrogen storage cylinder is often done by fixing the fiber grating at the designed position before the fiber is wound, then winding the monitoring optical fiber 400 onto the cylinder, and finally burying the monitoring optical fiber 400 in the winding layer of the cylinder by winding the fiber. For subsequent optical fiber connection, a longer section of optical fiber is generally reserved at the lead-out end of the monitoring optical fiber 400. Due to the lack of a suitable protective device, the lead-out section of the optical fiber is mainly fixed by bonding or directly hung at the bottle mouth. However, weak bonding and hanging will greatly increase the possibility of accidental damage to the lead-out section of the optical fiber. For this reason, a protective device for the monitoring optical fiber 400 of the hydrogen storage cylinder is urgently needed.

[0027] To solve the above problems, the present invention proposes an optical fiber protection device, a hydrogen storage bottle and a manufacturing method, which can effectively solve the problem that the lead-out section of the existing monitoring optical fiber 400 is mainly fixed by bonding or directly hung at the bottle mouth and is easily damaged by impact.

[0028] refer to Figure 1 The optical fiber protection device of the present invention is provided in the following embodiments: The optical fiber protection device of this embodiment includes an inner protective shell 100 , an outer protective shell 200 , a flexible filling layer 300 and a monitoring optical fiber 400 .

[0029] From the hydrogen storage cylinder to the outside, there are an inner protective shell 100, a flexible filling layer 300 and an outer protective shell 200. The inner protective shell 100 is sleeved on the outside of the hydrogen storage cylinder, and the outer protective shell 200 is sleeved on the outside of the inner protective shell 100. The inner protective shell 100 and the outer protective shell 200 are hard structures, which play a certain role in bearing pressure and resisting impact. The lead-out section of the monitoring optical fiber 400 is buried in the flexible filling layer 300, and the flexible filling layer 300 is used to buffer and protect the lead-out section of the monitoring optical fiber 400 and flexibly fix it, thereby realizing the protection function of the monitoring optical fiber 400.

[0030] Among them, the inner protective shell 100 is sleeved on the outside of one end of the hydrogen storage cylinder. The inner protective shell 100 has a hemispherical shell structure, and the shape of the inner wall is consistent with the outer wall of the two ends of the hydrogen storage cylinder, which is convenient for the inner protective shell 100 to fit tightly to the hydrogen storage cylinder for installation and fixation. At the same time, the internal force of the hemispherical shell structure is evenly distributed when under pressure, and the inner protective shell 100 plays a certain role in compressive protection for the hydrogen storage cylinder.

[0031] Furthermore, if Figure 2 , Figure 3 As shown, since boss interfaces are provided at both ends of the hydrogen storage cylinder, in order not to affect the use of the boss interface, a connecting hole 110 is provided at the center of the inner protective shell 100. The inner diameter of the connecting hole 110 is slightly larger than the outer diameter of the boss interface of the hydrogen storage cylinder, and space is reserved for the boss interface to pass through. A coaxial threaded connecting sleeve 120 is provided on the connecting hole 110, and the inner circumferential wall of the threaded connecting sleeve 120 is provided with an internal thread matching the boss interface. During installation, the threaded connecting sleeve 120 is sleeved on the boss interface, and the installation and fixation of the inner protective shell 100 is completed by rotation. In some other embodiments, the installation of the inner protective shell 100 can be achieved by other methods, such as: a slot structure, etc.

[0032] refer to Figure 2 , Figure 3 As shown, the inner protective shell 100 is provided with at least one inner optical fiber channel 130 penetrating the inner wall and the outer wall of the inner protective shell 100, which is used to lead out the monitoring optical fiber 400 arranged on the outside of the hydrogen storage cylinder. In the present embodiment, four inner optical fiber channels 130 are provided and have a circular hole structure. The inner optical fiber channels 130 are arranged in a ring-shaped interval around the connecting hole 110. When multiple monitoring optical fibers 400 are led out of one inner optical fiber channel 130, the inner diameter of the inner optical fiber channel 130 should be larger than the outer diameter of the monitoring optical fiber 400.

[0033] Since the inner protective shell 100 mainly plays the role of fixing and connecting, there is no special requirement for wear resistance and hardness, and general plastics such as polyethylene, polypropylene and amino plastics can be used.

[0034] The outer protective shell 200 is sleeved on the outside of the inner protective shell 100 and presents a hemispherical shell structure. The inner wall radius of the outer protective shell 200 is slightly larger than the outer wall radius of the inner protective shell 100, so that a filling gap is left between the outer protective shell 200 and the inner protective shell 100 for winding and arranging the excess length of the monitoring optical fiber 400. At the same time, since the internal force of the hemispherical shell structure is evenly distributed when under pressure, the outer protective shell 200 provides a certain compressive protection for the flexible filling layer 300, the inner protective shell 100 and the monitoring optical fiber 400.

[0035] Furthermore, if Figure 4 , Figure 5 As shown, a through hole 210 is provided at the center of the outer protective shell 200 and is arranged opposite to the connecting hole 110. The inner diameter of the through hole 210 is slightly larger than the outer diameter of the threaded connecting sleeve 120, and a space is reserved for the threaded connecting sleeve 120 and the boss interface to pass through. During installation, the threaded connecting sleeve 120 is passed through the through hole 210, which plays a certain positioning role.

[0036] The outer protective shell 200 of this embodiment is also provided with a connecting buckle structure 220 for fixing the outer protective shell 200 on the inner protective shell 100. The connecting buckle structure 220 is provided with a plurality of buckle bodies, which are common structures and are used for buckling with the edge of the inner protective shell 100.

[0037] The buckle bodies are located at the outer edge of the outer protective shell 200 and are evenly spaced in a ring shape, so that the force is evenly distributed, improving the stability and reliability of the connection. In some other embodiments, the outer protective shell 200 can also be fixedly installed by other structures, such as bolts, adhesives, etc.

[0038] Reference Figure 4 , Figure 5 As shown, the outer protective shell 200 is also provided with at least one outer optical fiber channel 230 that passes through the inner wall and the outer wall of the inner protective shell 100, which is used to lead out the monitoring optical fiber 400. In order to prevent the excess length of the monitoring optical fiber 400 from being entangled with each other in the filling gap, thereby causing damage to the monitoring optical fiber 400, in the present embodiment, the outer optical fiber channel 230 and the inner optical fiber channel 130 are staggered on the outside of the hydrogen storage cylinder to leave enough space for neatly winding and arranging the excess length of the monitoring optical fiber 400. In the present embodiment, four outer optical fiber channels 230 are provided and have a circular hole structure. The outer optical fiber channels 230 are arranged in a ring-shaped interval close to the outer edge of the outer protective shell 200.

[0039] In order to facilitate the connection of the monitoring optical fiber 400 to external demodulators and other terminal devices such as demodulation and display, multiple outer optical fiber channels 230 are provided with flange connectors 240, and one end of the monitoring optical fiber 400 is connected to the inner end of the flange connector 240, and the outer end of the flange connector 240 can be connected to a terminal device such as a demodulator via a signal transmission optical fiber, thereby realizing a quick and easy connection between the monitoring optical fiber 400 and the terminal device, and at the same time protecting and fixing the end of the monitoring optical fiber 400, effectively reducing the risk of damage to the end face of the monitoring optical fiber 400, and ensuring the signal transmission performance of the monitoring optical fiber 400.

[0040] Furthermore, a protective cover is provided on the flange connector 240 to prevent dust from entering the flange connector 240 and causing contamination of the end face of the monitoring optical fiber 400, reduce adverse effects such as return loss, and ensure normal transmission of the signal of the monitoring optical fiber 400.

[0041] Since the outer protective shell 200 is arranged at the outermost side of the protective device, it needs to have the characteristics of high hardness and good wear resistance. Plastic materials with high hardness such as polypropylene, polyamide, polyethylene and polyurethane and resins with excellent wear resistance can be used.

[0042] As can be seen from the above, the inner fiber optic channel 130 and the outer fiber optic channel 230 are connected to the filling gap, and the three together constitute the path of the monitoring optical fiber 400 from the outside of the hydrogen storage cylinder to the outer protective shell 200. However, the monitoring optical fiber 400 is not fixed in the filling gap, and there is still a risk of breaking and failing of the monitoring optical fiber 400 due to shaking. Therefore, a flexible filling layer 300 is required to fill the inner fiber optic channel 130, the filling gap and the outer fiber optic channel 230, so as to flexibly fix the monitoring optical fiber 400.

[0043] like Figure 6 , Figure 7 As shown, in this embodiment, the flexible filling layer 300 is located between the inner protective shell 100 and the outer protective shell 200 and fills the inner optical fiber channel 130, the gap and the outer optical fiber channel 230. In order to achieve the purpose of protecting and fixing the monitoring optical fiber 400, the flexible filling layer 300 adopts a foaming material, such as polyurethane foam, polystyrene foam, polyvinyl chloride foam, polyethylene foam and polypropylene foam. The foaming material is a soft material. After the foaming process, a porous substance with high strength and low density is formed, and it has good buffering and shock absorption functions.

[0044] In this embodiment, at least one monitoring optical fiber 400 is provided. The type of the monitoring optical fiber 400 may be a temperature sensor, a strain sensor, a hydrogen concentration sensor or any combination of sensors therein. The number of gratings of the monitoring optical fiber 400 is determined according to the monitoring requirements of the hydrogen storage cylinder, and may be a single monitoring grating point or a grating detection matrix.

[0045] The present invention also proposes a hydrogen storage cylinder and makes the following embodiments: The hydrogen storage cylinder includes the above-mentioned optical fiber protection device and a cylinder body 500, wherein the cylinder body 500 includes a hydrogen storage cylinder liner, a boss interface and a winding layer.

[0046] Regarding the installation and use of hydrogen storage cylinders: After the monitoring optical fiber 400 is set with a fiber grating according to the monitoring requirements of the cylinder body 500, the monitoring optical fiber 400 is buried in the winding layer by winding the fiber. A longer section is reserved at the end of the monitoring optical fiber 400 for convenient connection to an external terminal device. The monitoring optical fiber 400 is passed through the inner optical fiber channel 130, the filling gap and the outer optical fiber channel 230 in turn and connected to the inner end of the flange joint 240. The threaded connecting sleeve 120 of the inner protective shell 100 is matched with the boss interface of the cylinder body 500 and tightened to complete the connection and installation of the optical fiber protection device and the cylinder body 500.

[0047] In actual use, the external demodulator, display and other terminal devices are connected to the flange connector 240 via the signal transmission optical fiber. Depending on the type of the monitoring optical fiber 400, the real-time transmission signal transmitted by the monitoring optical fiber 400 can be analyzed to obtain information such as temperature, stress or leakage, thereby achieving real-time online monitoring and safety warning of the gas cylinder body 500 during its entire life cycle, effectively improving the safety of the use of the gas cylinder body 500.

[0048] The present invention also provides a manufacturing method, which is applicable to the above-mentioned hydrogen storage cylinder, and the manufacturing method comprises the following steps: Step S100: obtaining the inner protective shell 100 and the outer protective shell 200 by injection molding or compression molding; Step S200: passing the monitoring optical fiber 400 led out from the gas cylinder body 500 through the inner optical fiber channel 130; Step S300: The inner protective shell 100 is sleeved on one end of the gas cylinder body 500 to complete the installation and fixation of the inner protective shell 100; Step S400: Leading the end of the monitoring optical fiber 400 out from the outer optical fiber channel 230; Step S500: The outer protective shell 200 is placed on the outer side of the inner protective shell 100 to form a filling gap; Step S600: adjusting the position of the monitoring optical fiber 400 in the filling gap so that the excess length of the monitoring optical fiber 400 is wound around the outer side of the inner protective shell 100; Step S700: injecting a flexible filling material into the filling gap, the inner optical fiber channel 130 and the outer optical fiber channel 230 to obtain a flexible filling layer 300, and fixing the monitoring optical fiber 400.

[0049] In step S100, the injection molding process includes mold closing, glue injection, pressure holding, cooling, mold opening, and product removal. It is applicable to thermosetting plastics and thermoplastic plastics. The inner protective shell 100 and the outer protective shell 200 have simple structures and can achieve one-way rapid demolding.

[0050] In step S200 , the inner protective shell 100 approaches the cylinder body 500 along the axial direction of the cylinder body 500 , and a plurality of monitoring optical fibers 400 are led out from one end of the cylinder body 500 and pass through the inner optical fiber channel 130 .

[0051] In step S300, the connection hole 110 at the center of the inner protective shell 100 is correspondingly mounted on the boss interface of the gas cylinder body 500, the threaded connection sleeve 120 is matched and tightened with the threads on the outer periphery of the boss interface, and the inner protective shell 100 is connected and installed on the gas cylinder body 500.

[0052] In step S400 , the inner protective shell 100 approaches the cylinder body 500 along the axial direction of the cylinder body 500 , and the monitoring optical fiber 400 led out from the inner optical fiber channel 130 passes through the outer optical fiber channel 230 and is connected to the inner end of the flange joint 240 .

[0053] In step S500, the outer protective shell 200 is sleeved on the outside of the inner protective shell 100, the threaded connection sleeve 120 passes through the through hole 210, and the outer protective shell 200 is connected to the inner protective shell 100 through the connecting buckle structure 220 at the bottom of the outer protective shell 200. The inner wall of the outer protective shell 200 and the outer wall of the inner protective shell 100 jointly limit the space for filling the gap.

[0054] In step S600, the excess length of the monitoring optical fiber 400 is located in the filling gap, and the excess length of the monitoring optical fiber 400 is neatly arranged and wound on the outside of the inner protective shell 100 so that the monitoring optical fibers 400 are not connected to each other, reducing the risk of accidental damage to the monitoring optical fibers 400.

[0055] In step S700, a flexible filling material is injected into the filling gap, the inner optical fiber channel 130 and the outer optical fiber channel 230. The flexible filling material is a foaming material. Ensure that the flexible filling material completely fills the filling gap, the inner optical fiber channel 130 and the outer optical fiber channel 230. After the foaming process is completed, a flexible filling layer is formed. The monitoring optical fiber 400 is fixed to the outer side of the inner protective shell 100 by the flexible filling layer.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An optical fiber protection device for protecting the monitoring optical fiber of a hydrogen storage cylinder, characterized in that: include: An inner protective shell, fixedly sleeved on the outer side of the hydrogen storage cylinder, the inner protective shell being provided with at least one inner optical fiber channel penetrating the inner side wall and the outer side wall of the inner protective shell; An outer protective shell, fixedly sleeved on the outer side of the inner protective shell, the outer protective shell is provided with at least one outer optical fiber channel penetrating the inner side wall and the outer side wall of the outer protective shell, the outer optical fiber channel and the inner optical fiber channel are staggered on the outer side of the hydrogen storage cylinder, a filling gap is provided between the inner side wall of the outer protective shell and the outer side wall of the inner protective shell, and the filling gap is communicated with the inner optical fiber channel and the outer optical fiber channel respectively; A flexible filling layer, filling the filling gap, the inner optical fiber channel and the outer optical fiber channel; At least one monitoring optical fiber is provided, and the monitoring optical fiber is wound and embedded in the flexible filling layer, and two ends of the monitoring optical fiber are respectively arranged in the inner optical fiber channel and the outer optical fiber channel.

2. An optical fiber protection device according to claim 1, characterized in that: The flexible filling layer is made of foaming material.

3. The optical fiber protection device according to claim 1, characterized in that: The inner protective shell and the outer protective shell are both hemispherical shell structures. A through hole is provided at the center of the outer protective shell, and a connecting hole is provided at the center of the inner protective shell. The connecting hole is arranged opposite to the through hole.

4. An optical fiber protection device according to claim 3, characterized in that: The connection hole is coaxially provided with a threaded connection sleeve, the inner peripheral wall of the threaded connection sleeve is provided with an internal thread, and the threaded connection sleeve is sleeved on the through hole.

5. The optical fiber protection device according to claim 3, characterized in that: The edge of the outer protective shell is provided with a connecting buckle structure, and the connecting buckle structure is used to be connected with the edge of the inner protective shell.

6. An optical fiber protection device according to claim 5, characterized in that: The connecting buckle structure is provided with a plurality of buckle bodies, and the plurality of buckle bodies are arranged in a ring-shaped manner and at intervals.

7. The optical fiber protection device according to claim 1, characterized in that: The outer optical fiber channel is provided with a flange connector, and one end of the monitoring optical fiber is connected to the flange connector.

8. An optical fiber protection device according to claim 7, characterized in that: The inner optical fiber channel is provided with a plurality of monitoring optical fibers, and the plurality of monitoring optical fibers pass through one inner optical fiber channel and are connected through one flange joint, and the flange joint is provided with a protective cover.

9. A hydrogen storage cylinder, characterized in that: include: According to the optical fiber protection device and the gas cylinder body as described in any one of claims 1 to 8, the inner protective shell is sleeved on the end of the gas cylinder body, and the monitoring optical fiber is located at one end of the inner optical fiber channel and connected to the gas cylinder body.

10. A manufacturing method, characterized in that: Applicable to the hydrogen storage cylinder as claimed in claim 9, the manufacturing method comprises: The inner protective shell and the outer protective shell are obtained by injection molding or compression molding process; Lead one end of the monitoring optical fiber out from the inner optical fiber channel; The inner protective shell is sleeved on one end of the gas cylinder body to complete the installation and fixation of the inner protective shell; Passing the monitoring optical fiber led out from the gas cylinder body through the inner optical fiber channel; The outer protective shell is placed on the outer side of the inner protective shell to form a filling gap; Adjusting the position of the monitoring optical fiber in the filling gap so that the excess length of the monitoring optical fiber is wound around the outer side of the inner protective shell; A flexible filling material is injected into the filling gap, the inner optical fiber channel, and the outer optical fiber channel to obtain a flexible filling layer, and the monitoring optical fiber is fixed.

Images