Device and method for detecting air tightness of metal hose in hydrogen environment

Abstract

The invention provides an air tightness detection device and method for a metal hose in a hydrogen environment, and relates to the technical field of hose detection equipment. The device comprises a metal hose, the two ends of the metal hose are sealed, hydrogen with preset pressure is contained in the metal hose, and the fixed end of the metal hose is fixedly arranged; the vertical moving assembly comprises a vertical sliding rail and a pair of vertical sliding tables arranged on the vertical sliding rail in a sliding mode. One end of each telescopic piece is connected with the vertical sliding table; three end parts of the connecting piece are respectively hinged with the pair of telescopic pieces and the swinging end of the metal hose; and the detection end of the pressure detection piece is arranged in the metal hose. Hydrogen is contained in the metal hose, one end of the metal hose is fixed, the swing end of the metal hose is moved up and down through the vertical moving assembly to drive the swing end to bend downwards and upwards, then airtightness detection of the metal hose filled with hydrogen is achieved, and dynamic swing of the metal hose in the actual working condition is simulated.

Description

Technical Field

[0001] The present invention relates to the technical field of hose detection equipment, and particularly to an airtightness detection device and method for metal hoses in a hydrogen-containing environment. Background Art

[0002] With the rapid development of the hydrogen energy industry, higher requirements are put forward for the safety of metal components in the storage and transportation of hydrogen.

[0003] Metal hoses play a key role in hydrogen engines. Specifically, metal hoses are used to transport hydrogen from a storage system or supply source to the combustion chamber of a hydrogen engine. Due to the characteristics of hydrogen such as low density and easy leakage, metal hoses need to have good sealing performance to ensure that hydrogen does not leak during transportation and to ensure the normal operation of the hydrogen engine. During the operation of the hydrogen engine, vibrations and displacements may occur. Metal hoses have a certain degree of flexibility and bendability, which can effectively compensate for these vibrations and displacements and avoid problems such as pipeline rupture or leakage caused by rigid connections.

[0004] It can be seen that as a key component of the hydrogen transportation system, metal hoses are prone to a decrease in airtightness due to vibrations and hydrogen embrittlement effects when exposed to a hydrogen-containing environment for a long time, and there is a risk of leakage. Therefore, it is particularly important to conduct service life evaluation on the airtightness of metal hoses.

[0005] Currently, the commonly used airtightness detection devices for metal hoses are mostly limited to static or single-direction bending tests and cannot simulate the dynamic swing of metal hoses in actual working conditions. Summary of the Invention

[0006] In order to solve the technical problem that the commonly used airtightness detection devices for metal hoses in the prior art are mostly limited to static or single-direction bending tests and cannot simulate the dynamic swing of metal hoses in actual working conditions, an airtightness detection device and method for metal hoses in a hydrogen-containing environment are provided in an embodiment of the present invention. The technical solution is as follows:

[0007] On the one hand, an airtightness detection device for metal hoses in a hydrogen-containing environment is provided. The device includes:

[0008] A metal hose, the two ends of the metal hose are sealed, a hydrogen gas with a preset pressure is contained in the metal hose, and the fixed end of the metal hose is fixedly arranged;

[0009] A vertical moving component, the vertical moving component includes a vertical slide rail and a pair of vertical sliders slidably arranged on the vertical slide rail;

[0010] A pair of telescopic members, one end of the telescopic member is connected to the vertical slider;

[0011] A connecting piece, with three end parts of the connecting piece respectively hinged to a pair of the telescopic pieces and the swinging end of the metal hose;

[0012] A pressure detecting piece, with the detecting end of the pressure detecting piece arranged inside the metal hose.

[0013] Optionally, it further includes: a pressure regulating assembly, with the pressure regulating assembly hermetically connected to the fixed end of the metal hose;

[0014] The pressure regulating assembly includes: a hydrogen generator, a hydrogen booster pump, a pressure relief valve, a pressure regulating valve, a flow meter and a hydrogen transmission pipeline;

[0015] The hydrogen generator is communicated with the fixed end of the metal hose through the hydrogen transmission pipeline, and the hydrogen booster pump, the pressure relief valve, the pressure regulating valve and the flow meter are arranged on the hydrogen transmission pipeline.

[0016] Optionally, it further includes: a fixing assembly, with the fixing assembly including a fixed end support and a tooling flange, the fixed end support being connected to the fixed end of the metal hose through the tooling flange, and the side of the tooling flange connecting the hydrogen transmission pipeline.

[0017] Optionally, it further includes: a horizontal moving assembly, with the horizontal moving assembly connected to the fixing assembly.

[0018] Optionally, it further includes: a controller and a displacement sensor;

[0019] The displacement sensor is arranged on the telescopic piece;

[0020] The controller is communicatively connected to the vertical moving assembly, the telescopic piece and the displacement sensor.

[0021] Optionally, the telescopic piece includes a servo oil cylinder and an oil pump connected to the servo oil cylinder, with a temperature sensor inside the oil pump, and an alarm unit is further arranged on the oil pump, and the temperature sensor is communicatively connected to the alarm unit.

[0022] Optionally, a liquid level sensor is arranged inside the oil pump, and the liquid level sensor is communicatively connected to the alarm unit.

[0023] Optionally, it further includes: a vertical moving assembly, with the vertical moving assembly including a vertical slide rail and a vertical slide table slidably connected to the vertical slide rail, the vertical slide rail being fixed on the vertical slide table, and the vertical slide table connecting the telescopic piece.

[0024] Optionally, it further includes: a protective cover and a hydrogen concentration alarm. The protective cover covers the outer sides of the metal hose, the vertical movement assembly, the telescopic member, and the connecting member. The protective cover has a through hole, and the hydrogen concentration alarm is inserted into the through hole.

[0025] On the other hand, a method for detecting the airtightness of a metal hose in a hydrogen-containing environment is also provided. The method includes:

[0026] Filling hydrogen into the metal hose to a preset pressure;

[0027] Moving the swing end of the metal hose up and down through the vertical movement assembly, and driving the connecting member to swing and the telescopic member to expand and contract;

[0028] Obtaining a pressure detection member to obtain the pressure change inside the metal hose.

[0029] The beneficial effects brought by the technical solution provided in the embodiment of the present invention at least include:

[0030] The airtightness detection device for a metal hose in a hydrogen-containing environment provided in the embodiment of the present invention uses the metal hose to contain hydrogen, and the fixed end of the metal hose is fixed. The swing end of the metal hose is moved up and down through the vertical movement assembly to drive the swing end of the metal hose to perform an arc unconstrained movement, that is, to bend downward and upward, so as to realize the airtightness detection of the metal hose after being filled with hydrogen, to simulate the dynamic swing of the metal hose in the actual working condition, and to obtain the pressure data inside the metal hose in real time through the pressure detection member. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 is a schematic structural diagram of an airtightness detection device for a metal hose in a hydrogen-containing environment provided in an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of the swing bending part in an airtightness detection device for a metal hose in a hydrogen-containing environment provided in an embodiment of the present invention;

[0034] Figure 3 is Figure 2 a left view of;

[0035] Figure 4 is a flowchart of a method for detecting the airtightness of a metal hose in a hydrogen-containing environment provided in an embodiment of the present invention.

[0036] Reference numerals:

[0037] 1. Metal hose; 11. Plug

[0038] 2. Vertical moving component; 21. Vertical slide rail; 22. Vertical slide table; 23. Base

[0039] 3. Telescopic component

[0040] 4. Connecting component

[0041] 5. Pressure detection component

[0042] 6. Pressure regulation component; 61. Hydrogen generator; 62. Hydrogen pressure pump; 63. Pressure relief valve; 64. Pressure regulating valve; 65. Flow meter; 66. Hydrogen transmission pipeline; 67. "O"-shaped sealing rubber ring

[0043] 7. Fixing component; 71. Fixed end support; 72. Tooling flange; 73. Sheet metal support

[0044] 8. Horizontal moving component; 81. Horizontal slide rail 81; 82. Horizontal slide table

[0045] 9. Bottom platform

[0046] 10. Protective cover

[0047] 101. Hydrogen concentration alarm Detailed implementation manners

[0048] The technical solutions in the present invention will be described below with reference to the accompanying drawings.

[0049] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, the use of the word "example" aims to present concepts in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or either of the two can be selected.

[0050] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0051] The embodiments of the present invention provide a hermeticity detection device for a metal hose in a hydrogen-containing environment. Figure 1 It is a structural schematic diagram of a hermeticity detection device for a metal hose in a hydrogen-containing environment provided by the embodiments of the present invention. Please refer to Figure 1The device includes: a metal hose 1, a vertical movement component 2, a pair of telescopic components 3, a connecting piece 4, and a pressure detection component 5.

[0052] Specifically, both ends of the metal hose 1 are sealed. Hydrogen gas at a preset pressure is contained inside the metal hose 1, and the fixed end of the metal hose 1 is fixedly arranged.

[0053] Among them, the metal hose 1 can be the hose to be measured. The metal hose 1 meets the requirements for use in a hydrogen-containing environment, and its material has good hydrogen corrosion resistance. For example, it can be made of stainless steel or special alloy. Seal both ends of the metal hose 1. Using a welding process or a special sealing joint can ensure that no hydrogen leaks from the ends, guaranteeing the accuracy of the detection results. During use, with the help of an inflation device, hydrogen gas at a preset pressure can be filled into the metal hose 1. The pressure value therein is accurately set and monitored through the pressure detection component 5 according to the actual detection requirements. After filling with hydrogen, install the fixed end of the metal hose 1 at a preset fixed position to ensure that it will not displace during the detection process, so as to more accurately control parameters such as the swing amplitude and bending arc of the metal hose 1.

[0054] The above-mentioned vertical movement component 2 is used to drive the swing end of the metal hose 1 to swing up and down. Specifically, the vertical movement component 2 includes a vertical slide rail 21 and a vertical slide table 22. The vertical slide table 22 is slidably arranged on the vertical slide rail 21. Specifically, a dovetail groove or a linear bearing can be used to achieve a tight fit between the vertical slide table 22 and the vertical slide rail 21, ensuring that the slide table can slide smoothly and stably up and down on the slide rail. Specifically, the structure of the vertical slide table 22 can be integral or combined. This embodiment does not limit this.

[0055] One end of each telescopic component 3 in a pair of telescopic components 3 is connected to the vertical slide table 22. Specifically, the telescopic component 3 can be selected as a hydraulic telescopic rod or an electric telescopic rod to accurately control its telescopic length. The vertical slide table 22 is used to drive the telescopic component 3 to move up and down, and the telescopic component 3 is used to adjust the length in the horizontal direction through telescoping.

[0056] Three end parts of the connecting piece 4 are respectively hinged to a pair of telescopic components 3 and the swing end of the metal hose 1. Specifically, hinge holes are designed at the three end parts of the connecting piece 4 and are respectively hinged to a pair of telescopic components 3 and the swing end of the metal hose 1 through a pin shaft, ensuring that the connection part can rotate flexibly and providing sufficient freedom of movement for the swing of the metal hose 1. Through the above structure, during the up and down movement of the vertical slide table 22, the telescopic component 3 can telescope based on a preset telescopic speed and telescopic amount, thereby driving the swing end of the metal hose 1 to move.

[0057] Taking the downward swing of the metal hose 1 as an example: After the detection starts, the lower set of vertical slides 22 and the telescopic member 3 apply a force to the metal hose 1, causing the swinging end of the hose to move downward in an arc. The upper set of vertical slides 22 and the telescopic member 3 follow, but do not apply a force to the metal hose 1. After reaching the limit position of downward bending, the metal hose 1 swings upward to return to a straight state. During this process, the upper set of vertical slides 22 and the telescopic member 3 apply a force, while the lower set of vertical slides 22 and the telescopic member 3 follow, but do not apply a force to the metal hose 1 so that the hose can reach a completely straight state. The process of the metal hose 1 swinging upward is the same and will not be elaborated here.

[0058] Moreover, the detection end of the pressure detection member 5 is arranged inside the metal hose 1 and is used to obtain the pressure data inside the metal hose 1 in real time during the detection process. If there is a sudden drop, it indicates that hydrogen has leaked, that is, the airtightness of the metal hose 1 is poor. Specifically, the detection end of the pressure detection member 5 can be installed inside the metal hose 1 through a sealed interface to ensure that the detection end can accurately sense the pressure change of hydrogen inside the metal hose 1.

[0059] The airtightness detection device for a metal hose in a hydrogen-containing environment provided by the embodiment of the present invention uses the metal hose 1 to contain hydrogen, and the fixed end of the metal hose 1 is fixed. The swinging end of the metal hose 1 is moved up and down by the vertical moving assembly 2 to drive the swinging end of the metal hose 1 to achieve arc unconstrained movement, that is, to achieve downward and upward bending, and then to realize the airtightness detection of the metal hose 1 after being filled with hydrogen, so as to simulate the dynamic swing of the metal hose 1 in the actual working condition, and the pressure detection member 5 is used to obtain the pressure data inside the metal hose 1 in real time.

[0060] After completing the preset detection cycle, the operation of the vertical moving assembly 2 is stopped. The collected pressure data is comprehensively evaluated to determine whether the metal hose 1 meets the airtightness requirements. If the pressure data is stable and there is no obvious downward trend, it indicates that the airtightness of the metal hose 1 is good; if the pressure shows a significant drop, it is necessary to further check the sealing part, connection part, etc. of the metal hose 1 to determine the leakage point and perform repair or replacement.

[0061] Furthermore, the pressure detection member 5 can also be connected to a data acquisition system to monitor and record the pressure data in real time.

[0062] In an embodiment provided by the present invention, the device further includes: a pressure regulation assembly 6, and the pressure regulation assembly 6 is hermetically connected to the fixed end of the metal hose 1; the pressure regulation assembly 6 includes: a hydrogen generator 61, a hydrogen booster pump 62, a pressure relief valve 63, a pressure regulating valve 64, a flow meter 65 and a hydrogen transmission pipeline 66; the hydrogen generator 61 is connected to the fixed end of the metal hose 1 through the hydrogen transmission pipeline 66, and the hydrogen booster pump 62, the pressure relief valve 63, the pressure regulating valve 64 and the flow meter 65 are arranged on the hydrogen transmission pipeline 66.

[0063] Among them, the hydrogen generator 61 is used to output hydrogen, the hydrogen booster pump 62 is used to pressurize the hydrogen output by the hydrogen generator 61 to meet the detection requirements. The pressure relief valve 63 is used to discharge hydrogen after the detection is completed. The pressure regulating valve 64 is used to cooperate with the hydrogen generator 61 and the hydrogen booster pump 62 to jointly control the hydrogen pressure charged into the metal hose 1 to be tested. The flow meter 65 is used to measure the flow rate of hydrogen in the hydrogen transmission pipeline 66. The hydrogen transmission pipeline 66 is used to transport hydrogen from the hydrogen generator 61 to the metal hose 1 to be tested.

[0064] During the detection, one end of the metal hose 1 to be tested can be hermetically welded to the metal plug 11 through a flange, and the other end is bolt-connected to the equipment. After ensuring good sealing. Open the hydrogen generator 61 and the hydrogen booster pump 62 to fill the metal hose 1 to be tested with hydrogen at a set pressure, and keep the pressure for a period of time to ensure that there is no hydrogen leakage. Then drive the swinging end of the metal hose 1 to swing up and down through the vertical moving assembly 2.

[0065] In an embodiment provided by the present invention, the device further includes: a fixing component 7, and the fixing component 7 includes a fixed-end support 71 and a tooling flange 72. The fixed-end support 71 is connected to the fixed end of the metal hose 1 through the tooling flange 72, and the hydrogen transmission pipeline 66 is connected to the side of the tooling flange 72.

[0066] On the one hand, the tooling flange 72 can be used to fix and disassemble the fixed end of the metal hose 1, and on the other hand, it is also used to connect the hydrogen transmission pipeline 66 so as to introduce hydrogen into the metal hose 1.

[0067] Further, a rubber sealing ring is provided inside the tooling flange 72, and an "O"-shaped sealing rubber ring 67 is also provided at the connection between the hydrogen transmission pipeline 66 and the tooling flange 72. During the detection, after determining the diameter of the metal hose 1 specimen, a tooling flange 72 with a corresponding diameter can be selected, the rubber sealing ring inside the flange can be checked, and one end of it is rigidly connected to the fixed-end support 71 through bolts. The hydrogen transmission pipeline 66 is rigidly connected to the tooling flange 72 through the "O"-shaped sealing rubber ring 67. Manually open the hydrogen generator 61, and after adjusting the hydrogen booster pump 62 and the pressure regulating valve 64 to make the hydrogen pressure reach the experimental design requirements, close the hydrogen generator 61. One end of the metal hose 1 is rigidly connected to the tooling flange 72 as the fixed end.

[0068] The swinging end can be directly blocked using a flange-connected plug 11.

[0069] Figure 2 It is a schematic structural diagram of the swinging and bending part in a device for detecting the airtightness of a metal hose in a hydrogen-containing environment provided by an embodiment of the present invention; Figure 3 is Figure 2 the left view of, please refer toFigures 2 to 3 Further, in an embodiment provided by the present invention, the device further comprises: a horizontal movement assembly 8, and the horizontal movement assembly 8 is connected to the fixed assembly 7.

[0070] Specifically, the horizontal movement assembly 8 is connected to the fixed end support 71 in the fixed assembly 7. That is to say, the fixed end support 71 can be horizontally moved through the horizontal movement assembly 8. The function of this structure is to adjust the horizontal position of the fixed end according to the length of the metal hose 1 to be measured, so as to control the distance between the fixed end support 71 and the vertical movement assembly 2, adapt to the length of the metal hose 1 specimen, facilitate installation, and ensure the accuracy of the detection result.

[0071] Specifically, the horizontal movement assembly 8 may be composed of a horizontal slide rail 81 and a horizontal slide table 82, and the horizontal slide rail 81 extends along Figure 1 and Figure 2 the X-axis direction in

[0072] Further, it further comprises a vertical track. The horizontal slide rail 81 and the vertical track are perpendicular to each other, and the vertical track is slidably arranged on the horizontal slide rail 81 through a corresponding slide table. The above-mentioned horizontal slide table 82 is slidably arranged on the vertical track, the horizontal slide rail 81 extends along Figure 1 and Figure 2 the X-axis direction in Figure 3 and the vertical track extends along

[0073] the Y-axis direction in

[0074] In any of the above embodiments provided by the present invention, the device further comprises: a controller and a displacement sensor; wherein, the displacement sensor is arranged on the telescopic member 3; the controller is communicatively connected to the vertical movement assembly 2, the telescopic member 3, and the displacement sensor.

[0075] The function of the displacement sensor is to accurately obtain the telescopic amount of the telescopic member 3, that is, the displacement of the swing end of the metal hose 1 in the horizontal direction.

[0076] Through interaction with the controller, the controller can obtain the displacement of the swing end of the metal hose 1 in the horizontal direction through the telescopic amount of the telescopic member 3, so as to achieve high-precision control of the displacement of the swing end of the metal hose 1 in the horizontal direction.

[0077] Moreover, during the detection, the controller synchronously controls the moving distance of the vertical moving component 2 and the telescopic length of the telescopic component 3 at the corresponding position, and precisely adjusts the horizontal displacement in a timely manner according to the feedback of the displacement sensor, so as to achieve precise control of the position of the swinging end of the metal hose 1. Further, the controller can be a programmable logic controller (PLC), and by pre-writing a program, automatic computer control of the swinging process can be realized. Specifically, functions such as setting parameters such as the motion displacement (bending arc), the number of swings, and the specimen number can be set through the program.

[0078] For example, the telescopic component 3 can adopt a servo oil cylinder. By using a servo oil cylinder with a built-in displacement sensor, high-precision control of the displacement of the swinging end of the metal hose 1 in the horizontal direction can be achieved.

[0079] In an embodiment provided by the present invention, the telescopic component 3 includes a servo oil cylinder and an oil pump connected to the servo oil cylinder. The oil pump is provided with a temperature sensor, and an alarm unit is further provided on the oil pump. The temperature sensor is communicatively connected to the alarm unit.

[0080] Specifically, during the operation of the servo oil cylinder, the temperature may be too high due to various reasons. Through the temperature sensor and the alarm unit, an over-temperature alarm system is formed, which can detect abnormalities in a timely manner and avoid equipment damage. The temperature sensor can be set at positions such as the cylinder block, the piston rod, and the hydraulic oil. The alarm unit can output audible and visual alarms or remote alarms, etc.

[0081] Further, in an embodiment provided by the present invention, the oil pump is provided with a liquid level sensor, and the liquid level sensor is communicatively connected to the alarm unit.

[0082] Specifically, the liquid level sensor continuously monitors the liquid level of the hydraulic oil in the servo oil cylinder and transmits the liquid level information to the alarm unit. The microprocessor built in the alarm unit compares the received liquid level signal with the preset upper and lower limit thresholds. When the liquid level is higher than the upper limit or lower than the lower limit, the alarm unit immediately starts the alarm program and issues an alarm signal to remind the operator to take corresponding measures. The alarm unit can output audible and visual alarms or remote alarms, etc.

[0083] In an embodiment provided by the present invention, the device further includes: a vertical moving component, which includes a vertical slide rail and a vertical slide table slidably connected to the vertical slide rail. The vertical slide rail is fixed on the vertical slide table 22, and the vertical slide table is connected to the telescopic component 3.

[0084] Specifically, the above-mentioned vertical slide rail 21 is along Figure 1 and Figure 2 the Z-axis direction in Figure 3 and the vertical slide rail is along the Y-axis direction in . Through this structure, the swinging end can be moved in both the Z-axis direction and the Y-axis direction in the vertical plane.

[0085] Specifically, during the detection process, the power component can drive the vertical sliding table 22 to move up and down along the vertical slide rail 21. During this process, since the vertical slide rail is fixedly connected to the vertical sliding table 22 to form a whole, the vertical slide rail also moves up and down. Furthermore, the vertical slide rail drives the vertical sliding table, the telescopic member 3, and the swinging end of the metal hose 1 to move up and down.

[0086] Of course, the power component can also drive the vertical sliding table to move along the vertical slide rail in the Y-axis direction, so as to adjust the horizontal position of the swinging end or detect the horizontal swinging state of the swinging end.

[0087] Furthermore, the vertical slide rail 21 is arranged on the base 23 to achieve a fixing function. Furthermore, the base 23 can be fixed on the horizontal slide rail 81.

[0088] In an embodiment provided by the present invention, the device further includes: a protective cover 10 and a hydrogen concentration alarm 101. The protective cover 10 covers the outside of the metal hose 1, the vertical moving assembly 2, the telescopic member 3, and the connecting member 4. The protective cover 10 has through holes, and the hydrogen concentration alarm 101 is inserted into the through holes. The function of the protective cover 10 is to protect the normal operation of the components inside it. A hydrogen alarm is used to achieve an ultra-high hydrogen concentration alarm in the experimental environment and maintain the normal operation of the device. Furthermore, the protective cover 10 is transparent for observing the detection process. Even further, the material of the protective cover 10 is acrylic board.

[0089] When using this device to perform airtightness detection of the metal hose in a hydrogen-containing environment, the operation steps are as follows:

[0090] (1) Determine the caliber of the metal hose 1 specimen and select the corresponding flange. Check the rubber sealing ring inside the tooling flange 72 and rigidly connect one end of it to the fixed-end support 71.

[0091] (2) Rigidly connect the hydrogen transmission pipeline 66 to the tooling flange 72 through the "O"-shaped sealing rubber ring 67.

[0092] (3) Manually turn on the hydrogen generator 61. After adjusting the hydrogen pressure pump 62 and the pressure regulating valve 64 to make the hydrogen pressure reach the experimental design requirements, turn off the hydrogen generator 61.

[0093] (4) Rigidly connect one end of the metal hose 1 to the tooling flange 72 as the fixed end; connect the other end to the plug 11 for sealing as the swinging end.

[0094] (5) Move the horizontal sliding table 82 to make the experimental device adapt to the length of the metal hose 1.

[0095] (6) Place the pressure detection member 5 at the swinging end and observe the air pressure change in the pipe.

[0096] (7) Move a pair of vertical sliding tables 22 so that they are placed on the upper and lower sides of the metal hose 1 and at equal distances.

[0097] (8) The two groups of servo cylinders are hinged to the metal hose 1, and the initial positions are as Figures 1 to 3 shown.

[0098] (9) Open the hydrogen generator 61 until the pressure detector 5 reaches the design pressure and remains unchanged for a long time.

[0099] (10) Take the downward swing and bending of the metal hose 1 as an example: According to the required curvature and frequency of the metal hose 1 in the experiment, the computer controls the distance and speed of the downward movement of a pair of vertical sliding tables 22, as well as the distance and speed of the expansion and contraction of a pair of telescopic members 3 respectively, so that the swinging and bending of the metal hose 1 reach the required position and frequency. The upward swing and bending of the metal hose 1 are the same.

[0100] (11) After the test experiment is completed, the metal hose 1 returns to the straight state, and the data of the pressure detector 5 is read to obtain the airtightness conclusion of the test piece.

[0101] (12) Close the hydrogen generator 61, open the pressure relief valve 63, empty the hydrogen in the hydrogen transmission pipeline 66 system, and disassemble the metal hose 1, that is, complete the experiment.

[0102] During the whole experiment process, various protectors and alarms need to be monitored at all times. Once an accident occurs, the experiment needs to be stopped in time.

[0103] Working principle:

[0104] Through electrical signals, start the servo motor corresponding to the vertical sliding table 22, drive the vertical sliding table 22 to move and control its moving speed and displacement; through electrical signals, start the oil pump to drive the servo cylinder to move and control its expansion and contraction speed and expansion and contraction amount. The servo cylinder drives the test piece to move through the hinge joint. Take the downward swing of the metal hose 1 as an example: At the beginning of the experiment, the lower group of sliding tables and cylinders apply force to the metal hose 1, so that the swinging end of the hose moves downward in an arc. The upper group of sliding tables and cylinders follow, but do not apply force to the metal hose 1; during the process of the metal hose 1 recovering from the downward bending limit position to the straight state, the upper group of sliding tables and cylinders apply force so that the hose can reach the completely straight state, while the lower group of sliding tables and cylinders follow, but do not apply force to the metal hose 1. The upward swing of the metal hose 1 is the same. When the number of test times reaches the set number, the program issues a stop command, and the motor and the oil pump stop running.

[0105] The airtightness detection device for metal hoses in a hydrogen environment provided by the embodiments of the present invention contains hydrogen in the metal hose 1, and the fixed end of the metal hose 1 is fixed. The vertical movement assembly 2 moves the swing end of the metal hose 1 up and down to drive the swing end of the metal hose 1 to perform an arc unconstrained movement, that is, to bend downward and upward, so as to realize the airtightness detection of the metal hose 1 after being filled with hydrogen, to simulate the dynamic swing of the metal hose 1 in the actual working condition, and the pressure detection component 5 is used to obtain the pressure data in the metal hose 1 in real time.

[0106] The present invention also provides a method for detecting the airtightness of a metal hose in a hydrogen environment. Figure 4 The flowchart of a method for detecting the airtightness of a metal hose in a hydrogen environment provided by the embodiments of the present invention is shown in Figure 4 . This method includes:

[0107] 401. Fill the metal hose 1 with hydrogen to a preset pressure.

[0108] During the detection, one end of the metal hose 1 to be tested can be hermetically welded to the metal plug 11 through a flange, and the other end is bolted to the equipment. After ensuring good sealing, open the hydrogen generator 61 and the hydrogen booster pump 62 to fill the metal hose 1 to be tested with hydrogen at a set pressure, and keep the pressure for a period of time to ensure that there is no hydrogen leakage.

[0109] 402. Move the swing end of the metal hose 1 up and down through the vertical movement assembly 2, and drive the connecting piece 4 to swing and the telescopic piece 3 to telescope.

[0110] Taking the downward swing of the metal hose 1 as an example: after the detection starts, the lower group of vertical slides 22 and the telescopic piece 3 apply force to the metal hose 1, so that the swing end of the hose moves downward in an arc. The upper group of vertical slides 22 and the telescopic piece 3 follow, but do not apply force to the metal hose 1; after reaching the limit position of downward bending, the metal hose 1 swings upward to return to a straight state. During this process, the upper group of vertical slides 22 and the telescopic piece 3 apply force, while the lower group of vertical slides 22 and the telescopic piece 3 follow, but do not apply force to the metal hose 1 so that the hose can reach a completely straight state. The same is true for the upward swing process of the metal hose 1, which will not be elaborated here.

[0111] 403. Obtain the pressure detection component 5 to obtain the pressure change in the metal hose 1.

[0112] Specifically, the detection end of the pressure detector 5 is arranged inside the metal hose 1 and is used to obtain the pressure data inside the metal hose 1 in real time during the detection process. If there is a sudden drop, it indicates that hydrogen has leaked, that is, the airtightness of the metal hose 1 is poor. Specifically, the detection end of the pressure detector 5 can be installed inside the metal hose 1 through a sealed interface to ensure that the detection end can accurately sense the pressure change of hydrogen inside the metal hose 1.

[0113] In the airtightness detection method of the metal hose in a hydrogen-containing environment provided by the embodiment of the present invention, hydrogen is contained in the metal hose 1, and the fixed end of the metal hose 1 is fixed. The vertical moving assembly 2 is used to move the swinging end of the metal hose 1 up and down to drive the swinging end of the metal hose 1 to perform an arc unconstrained movement, that is, to bend downward and upward, so as to realize the airtightness detection of the metal hose 1 after being filled with hydrogen, to simulate the dynamic swing of the metal hose 1 in the actual working condition, and the pressure detector 5 is used to obtain the pressure data inside the metal hose 1 in real time.

[0114] By using the longitudinal displacement of the vertical moving assembly 2, the lateral displacement of the telescopic member 3 and its hinged connection with the swinging end of the metal hose 1, the control of the bending of the metal hose 1 specimen in any curvature in the up and down direction is realized. The present invention can realize the arc unconstrained movement of the swinging end of the metal hose 1, that is, while realizing downward and upward bending, accurately control its bending curvature, and can be applied to the tests of metal hoses 1 with different specifications and lengths.

[0115] After completing the preset detection cycle, stop the operation of the vertical moving assembly 2. Comprehensively evaluate the collected pressure data to judge whether the metal hose 1 meets the airtightness requirements. If the pressure data is stable and there is no obvious downward trend, it indicates that the airtightness of the metal hose 1 is good; if the pressure shows a significant drop, it is necessary to further check the sealing parts, connecting parts, etc. of the metal hose 1 to determine the leakage point and perform repair or replacement.

[0116] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A and B can be singular or plural. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after, but it may also represent an "and / or" relationship, which can be specifically understood with reference to the context before and after.

[0117] In the present invention, "at least one" means one or more, and "a plurality of" means two or more than two. "At least one of the following items" or its similar expressions refer to any combination of these items, including any combination of single item or plural items. For example, at least one of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or plural.

[0118] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the above - mentioned processes does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0119] As described above, the above are only specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A hermeticity detection device for a metal hose in a hydrogen-containing environment, characterized in that, The device includes: A metal hose, with both ends of the metal hose sealed. Hydrogen gas at a preset pressure is contained inside the metal hose, and the fixed end of the metal hose is fixedly arranged. A vertical moving component, which includes a vertical slide rail and a pair of vertical sliders slidably arranged on the vertical slide rail. A pair of telescopic components, with one end of the telescopic component connected to the vertical slider. A connecting component, with three end parts of the connecting component respectively hinged to a pair of the telescopic components and the swinging end of the metal hose. A pressure detection component, with the detection end of the pressure detection component arranged inside the metal hose.

2. The airtightness detection device for the metal hose in a hydrogen-containing environment according to claim 1, wherein, It further includes: A pressure regulation component, which is hermetically connected to the fixed end of the metal hose. The pressure regulation component includes: a hydrogen generator, a hydrogen pressure pump, a pressure relief valve, a pressure regulating valve, a flow meter, and a hydrogen transmission pipeline. The hydrogen generator is connected to the fixed end of the metal hose through the hydrogen transmission pipeline, and the hydrogen pressure pump, the pressure relief valve, the pressure regulating valve, and the flow meter are arranged on the hydrogen transmission pipeline.

3. The airtightness detection device for the metal hose in a hydrogen-containing environment according to claim 2, characterized in that, It further includes: A fixing component, which includes a fixed end support and a tooling flange. The fixed end support is connected to the fixed end of the metal hose through the tooling flange, and the side surface of the tooling flange is connected to the hydrogen transmission pipeline.

4. The airtightness detection device for the metal hose in a hydrogen-containing environment according to claim 3, wherein, It further includes: a horizontal moving component, which is connected to the fixing component.

5. The airtightness detection device for the metal hose in a hydrogen-containing environment according to any one of claims 1 to 4, characterized in that, It further includes: A controller and a displacement sensor; The displacement sensor is arranged on the telescopic component; The controller is communicatively connected to the vertical moving component, the telescopic component, and the displacement sensor.

6. The airtightness detection device for a metal hose in a hydrogen-containing environment according to claim 1, wherein, The telescopic component includes a servo oil cylinder and an oil pump connected to the servo oil cylinder. A temperature sensor is provided inside the oil pump, and an alarm unit is also arranged on the oil pump. The temperature sensor is communicatively connected to the alarm unit.

7. The airtightness detection device for a metal hose in a hydrogen-containing environment according to claim 6, wherein, A liquid level sensor is provided inside the oil pump, and the liquid level sensor is communicatively connected to the alarm unit.

8. The airtightness detection device for the metal hose in a hydrogen-containing environment according to claim 1, characterized in that, It further includes: A vertical moving component, which includes a vertical slide rail and a vertical slider slidably connected to the vertical slide rail. The vertical slide rail is fixed on the vertical slider, and the vertical slider is connected to the telescopic component.

9. The airtightness detection device for the metal hose in a hydrogen-containing environment according to claim 1, wherein It further includes: A protective cover and a hydrogen concentration alarm. The protective cover covers the outside of the metal hose, the vertical moving component, the telescopic component, and the connecting component. The protective cover has through holes, and the hydrogen concentration alarm is inserted into the through holes.

10. A method for detecting the airtightness of a metal hose in a hydrogen-containing environment, characterized in that, The method includes: Filling hydrogen gas into the metal hose to a preset pressure; Moving the swinging end of the metal hose up and down through the vertical moving component, and driving the connecting component to swing and the telescopic component to stretch and contract; Obtaining the pressure detection component to obtain the pressure change inside the metal hose.

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