CN219456063U - Hydrogen storage cylinder defect simulation sample bottle and sample block - Google Patents

Abstract

The utility model discloses a sample bottle and a sample block for simulating defects of a hydrogen storage bottle, which belong to the technical field of hydrogen storage bottle detection and comprise a sample bottle body, wherein the inner surface and the outer surface of the sample bottle body are provided with various defect patterns, and the defect patterns comprise folding defects, section mutation defects, cracking defects, pit corrosion defects, surface corrosion defects, abrasion defects and screw corrosion; the outer surface of the sample bottle body is also provided with a concave defect, a bulge defect and a bending defect. The utility model provides a hydrogen storage bottle defect simulation sample block for cooperate the aforesaid to simulate the sample block use, the sample block body includes end cover portion and end plug portion, and the surface of end plug portion is provided with multiple defect pattern, and defect pattern includes wear defect and screw corrosion. The utility model can simulate various common defects possibly encountered by the hydrogen cylinder in actual work so as to verify the detection capability of the existing detection means such as ultrasonic detection on the defects.

Description

Hydrogen storage cylinder defect simulation sample bottle and sample block

Technical Field

The utility model relates to the technical field of hydrogen storage cylinder detection, in particular to a hydrogen storage cylinder defect simulation sample cylinder and sample block.

Background

In recent years, along with the high-speed development of national economy in China, the demand for energy is also growing, hydrogen is rapidly developed as clean energy for automobile fuel under the guidance of national energy environmental protection policy, the proportion of hydrogen in the energy consumption structure in China is greatly increased, and containers for storing the energy are also developed towards the directions of high parametrization and structural complexity. In particular, different types of bottle-type containers show unique adaptability advantages in hydrogen storage, and the design pressure of the bottle-type containers is high and is up to 90MPa at present; the volume is large, and the volume of a single bottle is more than 2 cubic meters; the wall thickness is large and reaches more than 28.9 mm; there is also a high demand for the structural and functional safety of bottle-type containers.

Because of the large reserves of high-pressure hydrogen, frequent charging and discharging and easy hydrogen embrittlement, the hydrogen storage bottle has potential leakage and explosion risks. The hydrogen storage cylinder runs in a high-pressure environment for a long time, the hydrogen embrittlement sensitivity of the hydrogen-facing metal material is easy to be rapidly increased due to higher and higher hydrogen pressure, for example, the fatigue crack growth rate of the common hydrogen storage metal material 4130X is 10-15 times faster than that of the common hydrogen storage metal material in a 45MPa hydrogen-facing environment and the fracture toughness is reduced by more than 70%. Meanwhile, the hydrogen storage cylinder is easy to generate surface depression, bulge, fold, crack and inclusion during manufacturing, and the transition part between the neck and the end has the defects of abrupt change or obvious corrugation, and the defects generate potential safety hazards for the safety storage and transportation of the hydrogen storage cylinder. Therefore, it is particularly important to perform timely detection on defects of the hydrogen storage cylinder, and in order to better verify the defect detection capability of the existing detection equipment, test pieces with corresponding defects are required to be used for defect research, signal calibration and rechecking of the detection device.

According to research papers published by Zheng Jinyang institutions et al in 2022, the current state of development and challenges of hydrogen energy high-pressure storage and transportation equipment in China, the national standard of periodic inspection of hydrogen cylinders in China is currently under organization and drafting. Only the recommended standards or group standards related to GB/T35544-2017 (fully wound carbon fiber gas cylinder of compressed hydrogen aluminum inner container for vehicle) and T/CATSI02002-2018 (periodic inspection and evaluation of gas cylinder group for station) relate to partial detection requirements on the hydrogen cylinder, and have no perfect reference scheme for the defect form, detection method, judgment standard and the like of the hydrogen cylinder. It is necessary to collect or prepare gas cylinder-like vials containing known defects for investigation of the corresponding defects, signal calibration and review of the detection device. After searching, the required sample bottles for carrying out defect research, signal calibration and rechecking of a detection device are not found, so that preparation of relevant sample bottles containing defects for relevant research is needed for nondestructive detection to verify the detection capability of the existing nondestructive detection means on the defects.

Disclosure of Invention

1. Technical problem to be solved by the utility model

Aiming at the problem that a defect simulation sample piece is lack in the prior art and is used for verifying the defect detection effect of detection equipment on a hydrogen cylinder, the utility model provides the defect simulation sample bottle for the hydrogen storage cylinder, which can simulate various common defects possibly encountered by the hydrogen cylinder in actual work and is used for nondestructive detection so as to verify the detection capability of the existing nondestructive detection means on the defects.

The utility model also provides a hydrogen storage bottle defect simulation sample block which can be used by adapting to a simulation sample bottle, can simulate various common defects possibly encountered by a bottle stopper in actual work, and is convenient for detection and verification.

2. Technical proposal

In order to achieve the above object, the present utility model provides a hydrogen storage bottle defect simulation sample bottle, comprising a sample bottle body, wherein the inner surface and the outer surface of the sample bottle body are provided with a plurality of defect patterns, and the defect patterns comprise folding defects, section mutation defects, cracking defects, pit corrosion defects, surface corrosion defects, abrasion defects and screw corrosion; the defect pattern of the outer surface of the sample bottle body further comprises a concave defect, a bulge defect and a bending defect.

Further, the sample bottle body comprises a bottle mouth part, a bottle shoulder part and a bottle body part; the bottle mouth part is provided with an internal thread and an external thread, and crack defects, abrasion defects and thread corrosion are formed on the internal thread and the external thread; the bottle shoulder is provided with a folding defect, a section mutation defect and a crack defect; the bottle body is provided with a crack defect, a pit corrosion defect, a dent defect, a bulge defect, a surface corrosion defect and a bending defect.

Further, the crack defect comprises a circumferential crack and an axial crack, the length direction of the circumferential crack is perpendicular to the axis direction of the sample bottle body, and the length direction of the axial crack is parallel to the axis direction of the sample bottle body.

Further, the length of the crack defect is 24 mm-26 mm, the width is 0.9 mm-1.1 mm, and the depth is 1.4 mm-1.6 mm.

Further, the folding defect is a line defect pattern formed by oblique cutting, and the included angle between the folding position and the tangent line of the surface of the sample bottle body is 9-11 degrees.

Further, the pit corrosion defect is a flat bottom blind hole structure, the aperture is 2 mm-4 mm, and the hole depth is 3 mm-5 mm.

Further, the surface corrosion defect is of a stepped annular structure, the stepped ring comprises a first step and a second step, the depth of the first step in the side wall depression of the sample bottle body is 4mm, and the depth of the second step in the side wall depression of the sample bottle body is 2mm.

Further, the concave defect is in the shape of a concave outer surface and a convex inner surface of the sample bottle body; the bulge defect is in a shape that the outer surface of the sample bottle body is convex and the inner surface of the sample bottle body is concave.

Further, the thickness of the defect part of the concave defect and the bulge defect is consistent with the wall thickness of the sample bottle body.

The utility model also provides a hydrogen storage bottle defect simulation sample block which is used for being matched with the simulation sample bottle, wherein the sample block body comprises an end cover part and an end plug part, and the end plug part is connected with the bottle mouth part; the outer surface of the end plug part is provided with an external thread, and the external thread is provided with a plurality of defect patterns, wherein the defect patterns comprise abrasion defects and thread corrosion.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) According to the hydrogen storage bottle defect simulation sample bottle, various defect patterns are arranged on the inner surface and the outer surface of the sample bottle body, so that defects such as folding defects, section mutation defects, cracking defects, pit corrosion defects, dent defects, bulge defects, surface corrosion defects, bending defects, abrasion defects and screw corrosion which are common in actual work of a hydrogen bottle can be simulated, various defects of the hydrogen bottle can be conveniently researched by existing detection equipment such as ultrasonic equipment, various defect patterns can be calibrated, the detection results of the existing detection equipment such as ultrasonic equipment can be calibrated and rechecked, and the detection capability of the existing ultrasonic detection means on the defects can be verified.

(2) According to the hydrogen storage bottle defect simulation sample bottle, the crack defect, the abrasion defect and the screw corrosion are arranged on the bottle opening part, so that possible defects generated in the process of machining, assembling and using the bottle opening can be verified, and the detection method and the detection capability of the defects can be verified. The defects of folding, section mutation, cracking and the like generated in the processing processes of spinning, calcining and the like or the using process are simulated at the shoulder part of the bottle. Defects such as cracks, pit corrosion, surface corrosion, dents, bulges, bending and the like generated during manufacturing, assembling and using are simulated at the bottle body part, and a detection method and detection capability of the defects are verified. Through setting up corresponding defect pattern at the bottle mouth portion, the shoulder portion and the bottle portion of appearance bottle body, the work scene of the defect that the different positions of hydrogen cylinder produced more easily in the work that agrees with that can be good can increase the accuracy of simulation, is favorable to realizing the actual scene reduction that the hydrogen cylinder defect produced.

(3) The utility model relates to a hydrogen storage cylinder defect simulation sample bottle, which is more in line with the patterns of various defects generated by a hydrogen cylinder in actual work by limiting the shapes, positions and sizes of crack defects, folding defects, pit corrosion defects, surface corrosion defects, concave defects and bulge defects, and can further increase the simulation accuracy. The thickness of the defect part of the bulge defect and the concave defect is consistent with the wall thickness of the sample bottle body, the test principle of controlling single variable is met, the influence on the result of detecting the simulation defect due to the change of the wall thickness is avoided, and the simulation accuracy is improved.

(4) The hydrogen storage bottle defect simulation sample block can be matched with a simulation sample bottle to be used, is connected to the bottle mouth of the sample bottle body, and plays a role in sealing the bottle mouth. By providing external threads on the outer surface of the end plug portion of the sample block body, and providing wear defects and thread corrosion on the external threads, possible defects of the end plug portion during processing, assembly and use can be verified, for example, the reduction of the height of thread teeth due to thread corrosion or wear can be simulated, the thread teeth can be flattened or broken, and the detection method and detection capability of the defects can be verified.

Drawings

In the drawings, the dimensions and proportions are not representative of the dimensions and proportions of an actual product. The figures are merely illustrative and certain unnecessary elements or features have been omitted for clarity.

FIG. 1 is a schematic diagram of a simulated sample bottle according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of the structure of a dummy block and a dummy bottle mouth according to an embodiment of the present utility model.

Reference numerals in the schematic drawings illustrate:

1. a sample bottle body; 101. a bottle mouth; 102. a bottle shoulder; 103. a bottle body; 2. folding defects; 3. a cross-sectional abrupt defect; 4. a crack defect; 401. axial cracking; 402. circumferential cracks; 5. pit corrosion defects; 6. a dent defect; 7. a bulge defect; 8. surface corrosion defects; 9. bending defects; 10. wear defects; 11. screw thread corrosion; 12. a sample block body; 1201. an end cap portion; 1202. end plug portion.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples. What has been described herein is merely a preferred embodiment according to the present utility model, and other ways of implementing the utility model will occur to those skilled in the art on the basis of the preferred embodiment, and are within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," second, "" third, "" fourth, "" fifth, "and sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

The embodiment provides a hydrogen storage bottle defect simulation sample bottle, which considers rationality and completeness of defect simulation sample bottle and sample block manufacture, refers to the current relevant standard in design, and is used for periodically checking and evaluating a station gas storage bottle group, and is used for tracking the current relevant defect research and report of a high-pressure hydrogen storage bottle, so that the representativeness of defect setting and the feasibility of manufacturing the defect simulation sample bottle are fully ensured.

In this embodiment, referring to fig. 1 and 2, in order to facilitate the display, manufacture and detection of defects, first, a sample bottle body 1 is designed as a split half-type bottle body which is split equally along the axis of a gas bottle, and the inner surface and the outer surface of the sample bottle body 1 are provided with various defect patterns, wherein the defect patterns comprise a folding defect 2, a section abrupt change defect 3, a crack defect 4, a pit corrosion defect 5, a surface corrosion defect 8, a wear defect 10 and a thread corrosion 11; the outer surface of the sample bottle body 1 is also provided with a plurality of defect patterns including a concave defect 6, a bulge defect 7 and a bending defect 9, so that the existing detection equipment such as ultrasonic equipment can be conveniently used for expanding various defect researches on the hydrogen bottle, and can also be used for calibrating signals of various defect patterns, thereby realizing calibration and rechecking of the detection result of the existing detection equipment such as ultrasonic equipment and verifying the detection capability of the existing nondestructive detection means on the defects.

And secondly, manufacturing a simulation sample block for being matched with the sample bottle for simulating defects at the end plug. The sample block body 12 includes an end cap portion 1201 and an end plug portion 1202, and the end plug portion 1202 is connected to the bottle portion 101 to perform a closing function on the bottle portion 101. The outer surface of end plug 1202 is provided with external threads having a variety of defect patterns including wear defects 10 and thread corrosion 11 that verify possible defects of end plug 1202 during machining, assembly, and use, such as simulating reduced thread tooth height, flattened thread teeth, or fracture defects due to thread corrosion 11 or wear defects 10, and verifying the method and ability to detect these defects. The sample bottle body 1 is made of a common hydrogen storage metal material 4130X chromium molybdenum steel, the outer diameter of the gas bottle is 559mm, the length is 2000mm, and the thickness is 30mm.

In this embodiment, referring to fig. 1, the main structure of the sample bottle body 1 includes a bottle mouth 101, a bottle shoulder 102 and a bottle body 103, the bottle mouth 101 is provided with an internal thread and an external thread, and the main defects provided on the internal thread and the external thread are in the form of a crack defect 4, a wear defect 10 and a thread corrosion 11, so that possible defects generated during processing, assembling and using the bottle mouth 101 can be verified, and the detection method and the detection capability of the defects can be verified. The main defects of the shoulder 102 are a folding defect 2, a section abrupt change defect 3 and a crack defect 4, and the defects of folding, section abrupt change, cracks and the like generated in the processing process of spinning, calcining and the like or the using process are simulated in the shoulder 102. The main defects provided in the bottle portion 103 are a crack defect 4, a pit corrosion defect 5, a dent defect 6, a bulge defect 7, a face corrosion defect 8, and a bending defect 9, and defects such as cracks, pit corrosion, face corrosion, dents, bulges, and bending, which are generated during manufacturing, assembling, and using, are simulated in the bottle portion 103, and a detection method and a detection capability of these defects are verified. Through setting up corresponding defect pattern at bottleneck portion 101, shoulder portion 102 and bottle portion 103 of appearance bottle body 1, the work scene that produces the defect more easily of different positions of hydrogen cylinder in the work that can be fine agrees with, can increase the accuracy of simulation, is favorable to realizing the actual scene reduction to the hydrogen cylinder defect production.

In order to fully verify the detection capability of the defects, the defect arrangement is positioned on the outer surface, the inner surface and the specific structure of the sample bottle body 1 as far as possible, the specific structure is mainly the position of the bottle shoulder, various position defects are fully simulated, typical defect signals of the defects at different positions are obtained, and evaluation references are provided for actual defect detection.

In order to further improve accuracy of the simulation result, various defect patterns set on the sample bottle body 1 are closer to defect patterns of the hydrogen bottle in actual operation, and a designer designs shapes, positions and sizes of various defect patterns, for example, in this embodiment, referring to fig. 1, the crack defect 4 includes a circumferential crack 402 and an axial crack 401, a length direction of the circumferential crack 402 is perpendicular to an axis direction of the sample bottle body 1, and a length direction of the axial crack 401 is parallel to the axis direction of the sample bottle body 1. The length of the crack defect 4 is 24 mm-26 mm, the width is 0.9 mm-1.1 mm, and the depth is 1.4 mm-1.6 mm. The folding defect 2 is a line defect pattern formed by oblique cutting, and the included angle between the folding position and the tangent line of the surface of the sample bottle body 1 is 9-11 degrees. The pit corrosion defect 5 is a flat bottom blind hole structure, the aperture is 2 mm-4 mm, and the hole depth is 3 mm-5 mm. The surface corrosion defect 8 is of a stepped annular structure, the stepped ring comprises a first step and a second step, the depth of the first step in the side wall depression of the sample bottle body 1 is 4mm, and the depth of the second step in the side wall depression of the sample bottle body 1 is 2mm. The concave defect 6 is in the shape of concave on the outer surface and convex on the inner surface of the sample bottle body 1; the bulge defect 7 takes the shape of a bulge on the outer surface and a recess on the inner surface of the sample bottle body 1. The thickness of the defect part of the concave defect 6 and the bulge defect 7 is consistent with the wall thickness of the sample bottle body 1, the test principle of controlling a single variable is met, the influence on the result of detecting the simulation defect due to the change of the wall thickness is avoided, and the simulation accuracy is improved.

In this embodiment, in order to better verify the capability of the existing detection device, such as an ultrasonic device, to detect the defects of the hydrogen cylinder, the types, positions and sizes of the various defects shown in the following table 1 are prefabricated in the sample cylinder, and evaluation references are provided for actual defect detection.

TABLE 1 preset defect types, preset defect locations, preset defect sizes in sample bottles, sample blocks

It should be noted that the values of the defect sizes in table 1 are a preferred embodiment, and the values can be adjusted according to design requirements. The reduction in the height of the thread teeth due to corrosion or abrasion is simulated in the finish portion 101, and the thread teeth are flattened or broken. The reduction in thread tooth height due to corrosion or wear is simulated in the end plug portion 1202, and the thread tooth is flattened or broken. The folding defect 2 is only processed into a line defect pattern obtained by oblique cutting, and the included angle between the folding position and the tangent line of the surface of the sample bottle body 1 is 10 degrees. The abrupt change of the section simulates the non-smooth transition of the bottle wall, the wall thickness change in the wall thickness direction only simulates the increase of the wall thickness, and the wall thickness reduction is additionally arranged in the corrosion defect. The concave is arranged as concave outside the bottle and convex inside the bottle under the condition that the wall thickness is not thinned. The bulge is arranged under the condition that the wall thickness is not thinned, and the bulge is convex outside the bottle and the concave defect is formed inside the bottle. The bending is simulated to simulate the straightness exceeding standard defect of the bottle body, and the maximum chord height value is taken as a bending reference, wherein the maximum chord height value in the embodiment is 40mm.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (10)

1. The hydrogen storage bottle defect simulation sample bottle comprises a sample bottle body (1) and is characterized in that the inner surface and the outer surface of the sample bottle body (1) are provided with a plurality of defect patterns, wherein the defect patterns comprise folding defects (2), section mutation defects (3), crack defects (4), pit corrosion defects (5), surface corrosion defects (8), abrasion defects (10) and thread corrosion (11); the defect pattern of the outer surface of the sample bottle body (1) further comprises a concave defect (6), a bulge defect (7) and a bending defect (9).

2. A hydrogen storage bottle defect simulation sample bottle according to claim 1, characterized in that the sample bottle body (1) comprises a bottle mouth (101), a bottle shoulder (102) and a bottle body (103); the bottle mouth part (101) is provided with an internal thread and an external thread, and crack defects (4), abrasion defects (10) and thread corrosion (11) are respectively arranged on the internal thread and the external thread; the bottle shoulder part (102) is provided with a folding defect (2), a section abrupt change defect (3) and a crack defect (4); the bottle body (103) is provided with a crack defect (4), a pit corrosion defect (5), a dent defect (6), a bulge defect (7), a surface corrosion defect (8) and a bending defect (9).

3. A hydrogen storage bottle defect simulation sample bottle according to claim 2, characterized in that the crack defect (4) comprises an axial crack (401) and a circumferential crack (402), the length direction of the circumferential crack (402) is perpendicular to the axis direction of the sample bottle body (1), and the length direction of the axial crack (401) is parallel to the axis direction of the sample bottle body (1).

4. A hydrogen storage cylinder defect simulation sample bottle according to claim 3, wherein the length of the crack defect (4) is 24-26 mm, the width is 0.9-1.1 mm, and the depth is 1.4-1.6 mm.

5. The simulated sample bottle for the defect of the hydrogen storage bottle according to claim 2, wherein the folding defect (2) is a line defect pattern formed by oblique cutting, and the included angle between the folding position and the tangent line of the surface of the sample bottle body (1) is 9-11 degrees.

6. The simulated sample bottle for the defects of the hydrogen storage bottle according to claim 2, wherein the pit corrosion defect (5) is of a flat bottom blind hole structure, the aperture is 2 mm-4 mm, and the hole depth is 3 mm-5 mm.

7. The hydrogen storage bottle defect simulation sample bottle according to claim 2, wherein the surface corrosion defect (8) is of a stepped annular structure, the stepped ring comprises a first step and a second step, the depth of the first step in the side wall of the sample bottle body (1) is 4mm, and the depth of the second step in the side wall of the sample bottle body (1) is 2mm.

8. The simulated sample bottle for the defect of the hydrogen storage bottle according to claim 2, wherein the concave defect (6) takes the shape of a concave outer surface and a convex inner surface of the sample bottle body (1); the bulge defect (7) is in a shape that the outer surface of the sample bottle body (1) is convex and the inner surface is concave.

9. A hydrogen storage cylinder defect simulation sample cylinder according to claim 8, characterized in that the thickness of the defect part of the concave defect (6) and the bulge defect (7) is consistent with the wall thickness of the sample cylinder body (1).

10. A hydrogen storage bottle defect simulation sample block, characterized in that the sample block is used with the simulation sample bottle according to any one of claims 2-9, the sample block body (12) comprises an end cover part (1201) and an end plug part (1202), and the end plug part (1202) is connected with the bottle mouth part (101); the outer surface of the end plug portion (1202) is provided with an external thread, on which are provided a plurality of defect patterns including wear defects (10) and thread corrosion (11).