Hydrogen storage cylinder coated with carbon fiber layer

Abstract

The utility model relates to a hydrogen storage cylinder coated with a carbon fiber layer, which belongs to the field of hydrogen storage cylinders, and comprises a hydrogen storage cylinder body and a carbon fiber layer coated on the outer wall of the hydrogen storage cylinder body, an optical fiber is arranged between the outer wall of the hydrogen storage cylinder body and the carbon fiber layer, and the optical fiber is laid on the outer wall of the hydrogen storage cylinder body; the optical fiber is attached to the circumferential outer wall of the hydrogen storage cylinder body; when being observed along the axis direction of the hydrogen storage cylinder body, each optical fiber is in a non-circular ring shape; and a port of the optical fiber can penetrate out of the carbon fiber layer from one side of the hydrogen storage cylinder body in the axis direction. The hydrogen storage cylinder coated with the carbon fiber layer can prevent the optical fiber from being broken due to self-tightening.

Description

Technical Field

[0001] The utility model belongs to the field of hydrogen storage cylinders, and in particular relates to a hydrogen storage cylinder coated with a carbon fiber layer. Background Art

[0002] In order to increase the strength of the hydrogen storage cylinder, a carbon fiber layer is wrapped on the outer wall of the hydrogen storage cylinder, which is called a carbon fiber layer-coated hydrogen storage cylinder.

[0003] The deformation of hydrogen storage cylinders covered with carbon fiber layers needs to be detected to promptly know whether the pressure bearing capacity of hydrogen storage cylinders has decreased. The current method for deformation detection of hydrogen storage cylinders is: Figure 5 , the optical fiber is spirally wound around the outer wall of the hydrogen storage cylinder. The optical fiber appears in a ring shape along the axis of the hydrogen storage cylinder. The optical fiber is located between the outer wall of the hydrogen storage cylinder and the inner wall of the carbon fiber layer. The end of the optical fiber can pass through the carbon fiber layer, and one end of the optical fiber can be electrically connected to the modulator outside the hydrogen storage cylinder, and the other end is used for light source incidence. The modulator is used to convert the optical signal monitored by the optical fiber into an electrical signal, and finally transmit it to the analysis unit for analysis.

[0004] After the light source is injected into the optical fiber, if the analysis element detects that the Bragg grating structure in the optical fiber has a slight frequency shift due to the strain of the hydrogen storage cylinder, it indicates that the hydrogen storage cylinder has deformed, and the deformation of the hydrogen storage cylinder can be known based on the degree of frequency shift. The frequency shift is measured by spectral analysis technology.

[0005] Generally, hydrogen cylinders covered with carbon fiber layers need to be "self-tightened" before leaving the factory. This is to make the hydrogen cylinder fit tightly with the carbon fiber layer. The "self-tightening" method is to fill the hydrogen cylinder with sufficient air pressure to make it expand outward. Since the carbon fiber layer is not easy to deform, the expansion of the hydrogen cylinder will fit tightly with the carbon fiber layer, achieving the purpose of "self-tightening".

[0006] However, because the hydrogen storage cylinder covered with the carbon fiber layer is "self-tightened", the optical fiber wrapped around the outside of the hydrogen storage cylinder will also expand, causing the optical fiber to be stretched and broken. Utility Model Content

[0007] The hydrogen storage cylinder coated with the carbon fiber layer of the utility model can prevent the optical fiber from being broken due to "self-tightening".

[0008] In order to achieve the above-mentioned purpose, the carbon fiber layer-coated hydrogen storage cylinder of the utility model comprises a hydrogen storage cylinder body and a carbon fiber layer wrapped on the outer wall of the hydrogen storage cylinder body, a plurality of optical fibers are arranged between the outer wall of the hydrogen storage cylinder body and the carbon fiber layer, and the optical fibers are laid on the outer wall of the hydrogen storage cylinder body; the optical fibers are bonded to the circumferential outer wall of the hydrogen storage cylinder body;

[0009] Observing along the axial direction of the hydrogen storage cylinder body, each optical fiber is non-circular; the end of the optical fiber can pass through the carbon fiber layer from one side of the axial direction of the hydrogen storage cylinder body.

[0010] Different from the existing optical fiber layout, in this solution, the optical fiber is laid on the outer wall of the hydrogen storage cylinder body. When the hydrogen storage cylinder body is "self-tightened", the expansion of the hydrogen storage cylinder body cannot cause the optical fiber to expand because the optical fiber is not wound on the outer wall of the hydrogen storage cylinder body. The optical fiber can be adaptively displaced due to the expansion of the hydrogen storage cylinder body, so the optical fiber of this solution will not be broken. Compared with the prior art where the optical fiber is wound on the outer wall of the hydrogen storage cylinder body, when the hydrogen storage cylinder body is "self-tightened", the optical fiber will expand and be broken; this solution avoids the optical fiber breakage caused by the "self-tightening" of the hydrogen storage cylinder body as much as possible.

[0011] Furthermore, the optical fiber is arranged in a wave shape.

[0012] Compared with the straight fiber layout, the wavy layout can cover a larger area of ​​the outer wall of the hydrogen storage cylinder. The coverage here and in the following text is not coverage in a narrow sense, but coverage in a broad sense, which refers to the area that can be covered in a broad sense, not complete coverage in a narrow sense. In this way, the entire surface of the hydrogen storage cylinder can be covered as much as possible while using as little fiber as possible.

[0013] Furthermore, a plurality of optical fibers are provided.

[0014] If only one optical fiber is used, the optical fiber will not be able to completely cover the entire surface of the outer wall of the hydrogen storage cylinder body, so there will be areas that are missed during detection. Because using one optical fiber to cover the entire outer wall of the hydrogen storage cylinder body is equivalent to wrapping the optical fiber around the outer wall of the hydrogen storage cylinder body, so using only one optical fiber can only cover a certain area of ​​the hydrogen storage cylinder body, and the optical fiber detection of a certain area on the outer wall of the hydrogen storage cylinder body represents the entire outer wall of the hydrogen storage cylinder body, which is inaccurate. Therefore, multiple optical fibers are set up, and multiple optical fibers can better and completely cover the outer wall of the hydrogen storage cylinder body, and the monitoring results are more objective.

[0015] Furthermore, the optical fibers are arranged in a circular array around the axis of the hydrogen storage cylinder body.

[0016] If the sizes of the optical fibers are not uniform, the displacement of each optical fiber when the hydrogen storage cylinder body is "self-tightened" may be different, resulting in different positions of the optical fibers after the hydrogen storage cylinder body is "self-tightened". Therefore, the optical fibers are arranged in a circular array around the axis of the hydrogen storage cylinder body.

[0017] Furthermore, let the two adjacent optical fibers be optical fiber A and optical fiber B respectively, and let the line connecting the points where the troughs of optical fiber A are located be L1, and the line connecting the points where the peaks of optical fiber A are located be L2; let the line connecting the points where the troughs of optical fiber B be L3, and the line connecting the points where the peaks of optical fiber B are located be L4; then L1 coincides with L4 or L2 coincides with L3.

[0018] This is to ensure that the coverage areas of the two adjacent optical fibers are exactly connected, which is conducive to ensuring that each optical fiber covers the entire outer wall of the hydrogen storage cylinder body. Beneficial Effects

[0019] 1. The optical fiber is laid on the outer wall of the hydrogen storage cylinder body, not wound around it. Viewed from the axis of the hydrogen storage cylinder, the optical fiber is not in a circular shape, and can produce adaptive displacement when the hydrogen storage cylinder is self-tightened. When the hydrogen storage cylinder body is "self-tightened", the optical fiber will not be broken.

[0020] 2. The optical fiber is designed to be wavy, which can ensure that the optical fiber can cover the outer wall of the entire hydrogen storage cylinder body while using as little optical fiber as possible.

[0021] 3. Multiple optical fibers are provided, which can completely cover the outer wall of the entire hydrogen storage cylinder body in a non-entangled manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the hydrogen storage cylinder covered with a carbon fiber layer when only one optical fiber is shown;

[0023] Figure 2 is a cross-sectional view of the end face of the hydrogen storage cylinder coated with the carbon fiber layer;

[0024] Figure 3 It is one of the distribution modes of optical fiber A and optical fiber B;

[0025] Figure 4 It is another distribution method of optical fiber A and optical fiber B;

[0026] Figure 5 The invention relates to a hydrogen storage cylinder which is coated with a carbon fiber layer when an optical fiber is spirally wound in the prior art.

[0027] 1. Hydrogen storage cylinder body; 2. Carbon fiber layer; 3. Optical fiber. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See Figure 1 The carbon fiber layer-coated hydrogen storage cylinder comprises a hydrogen storage cylinder body 1 and a carbon fiber layer 2 wrapped around the outer wall of the hydrogen storage cylinder body 1.

[0030] At least one optical fiber 3 is provided between the outer wall of the hydrogen storage cylinder body 1 and the carbon fiber layer 2. In this embodiment, there are multiple optical fibers 3. Multiple optical fibers 3 are laid on the outer wall of the hydrogen storage cylinder body 1, and the optical fibers 3 are attached to the outer wall of the hydrogen storage cylinder body 1. Figure 2 , viewed from the axial direction of the hydrogen storage cylinder body 1, because the circumferential outer wall of the hydrogen storage cylinder body 1 is not a plane but a curved surface, the optical fiber 3 can fit the curved surface and the optical fiber 3 is also arranged in a curve.

[0031] In this embodiment, the optical fibers 3 are arranged in a circular array around the axis of the hydrogen storage cylinder body 1 .

[0032] From the perspective of a single optical fiber 3, the shape of the optical fiber 3 is wavy. The extending direction of the wavy optical fiber 3 is along the axial direction of the hydrogen storage cylinder body 1. In other words, the length direction of the wavy optical fiber 3 is parallel to the axial direction of the hydrogen storage cylinder body 1.

[0033] Seen from the axis of the hydrogen storage cylinder, each optical fiber 3 cannot be in a circular shape, so when the hydrogen storage cylinder expands, each optical fiber 3 can produce adaptive displacement to avoid being broken.

[0034] The two end ports of the optical fiber 3 can respectively pass through the carbon fiber layer 2 from both sides of the axial direction of the hydrogen storage cylinder body 1. One end is electrically connected to a monitoring element, such as a host computer, through a modulator, and the other end is provided for incident light. The monitoring element can read the frequency shift monitored by the optical fiber 3 by means of spectral analysis technology, and the degree of deformation of the hydrogen storage cylinder body 1 can be indirectly reflected according to the frequency shift.

[0035] In this embodiment, two adjacent optical fibers 3 are respectively set as optical fiber A and optical fiber B, the line connecting the points where the troughs of optical fiber A are located is L1, and the line connecting the points where the peaks of optical fiber A are located is L2; ​​the line connecting the points where the troughs of optical fiber B are located is L3, and the line connecting the points where the peaks of optical fiber B are located is L4; see Figure 3 and Figure 4 , then L1 coincides with L4 or L2 coincides with L3.

[0036] In the hydrogen storage cylinder covered with the carbon fiber layer, since the optical fiber 3 is no longer spirally wound on the circumferential side wall of the hydrogen storage cylinder body 1, the optical fiber 3 will not be broken due to the expansion of the hydrogen storage cylinder when the hydrogen storage cylinder body 1 is "self-tightened". In the hydrogen storage cylinder covered with the carbon fiber layer, when the hydrogen storage cylinder body 1 is "self-tightened", since each optical fiber 3 presents a non-closed ring shape along the axis of the hydrogen storage cylinder body, each optical fiber 3 can produce a small adaptive deformation on the circumferential side wall of the hydrogen storage cylinder body 1, avoiding the situation where each optical fiber 3 is broken due to the "self-tightening" of the hydrogen storage cylinder body 1.

[0037] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A hydrogen storage cylinder coated with a carbon fiber layer, comprising a hydrogen storage cylinder body and a carbon fiber layer wrapped around the outer wall of the hydrogen storage cylinder body, characterized in that: A plurality of optical fibers are arranged between the outer wall of the hydrogen storage cylinder body and the carbon fiber layer, and the optical fibers are laid on the outer wall of the hydrogen storage cylinder body; the optical fibers are bonded to the circumferential outer wall of the hydrogen storage cylinder body; Observing along the axial direction of the hydrogen storage cylinder body, each optical fiber is non-circular; the end of the optical fiber can pass through the carbon fiber layer from one side of the axial direction of the hydrogen storage cylinder body.

2. The carbon fiber layer-coated hydrogen storage cylinder according to claim 1, characterized in that: The optical fiber is arranged in a wave shape.

3. The carbon fiber layer-coated hydrogen storage cylinder according to claim 2, characterized in that: A plurality of optical fibers are provided.

4. The carbon fiber layer-coated hydrogen storage cylinder according to claim 3, characterized in that: The optical fibers are arranged in a circular array around the axis of the hydrogen storage cylinder body.

5. The carbon fiber layer-coated hydrogen storage cylinder according to claim 3, characterized in that: Let two adjacent optical fibers be optical fiber A and optical fiber B respectively, and let the line connecting the points where the troughs of optical fiber A are located be L1, and the line connecting the points where the peaks of optical fiber A are located be L2; let the line connecting the points where the troughs of optical fiber B be L3, and the line connecting the points where the peaks of optical fiber B are located be L4; then L1 coincides with L4 or L2 coincides with L3.

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