Hydrogen conveying pipeline service state monitoring device and hydrogen conveying pipeline

Abstract

The utility model relates to a hydrogen conveying pipeline service state monitoring device and a hydrogen conveying pipeline. According to the hydrogen conveying pipeline service state monitoring device, a hydrogen conveying pipeline comprises a plurality of conveying pipelines and a plurality of connectors, every two adjacent conveying pipelines are connected through one connector, the hydrogen conveying pipeline service state monitoring device comprises a sleeve, the sleeve is arranged on the peripheral side of at least part of the connectors and the peripheral side of one part of the conveying pipelines in a sleeving mode, and the connectors are connected with the sleeves in a sleeving mode. A monitoring cavity is defined by the inner surface of the sleeve, the outer surface of at least part of the connector and the outer surface of one part of the conveying pipeline; the hydrogen concentration detector is arranged in the monitoring cavity, and the hydrogen concentration detector is used for detecting the concentration of hydrogen in the monitoring cavity; and the displacement sensor is used for detecting a displacement change value between the joint and the conveying pipeline which are connected with each other. Therefore, the device for monitoring the service state of the hydrogen conveying pipeline has the advantages of high safety and high reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen pipeline monitoring, in particular to a monitoring device for the service state of a hydrogen pipeline and a hydrogen pipeline. Background Art

[0002] As a renewable energy source, hydrogen energy will play an important role in the transformation and upgrading of China's energy. Compared with metal pipelines, the thermoplastic non-metallic composite pipeline transportation system can solve the problems faced by metal pipelines such as hydrogen embrittlement, weak welding joints, and high construction and operation costs. It has many advantages such as high pressure resistance, acid and alkali resistance, anti-microbial erosion, good flexibility and mechanical strength, aging resistance, long service life, and low investment cost, and can meet more demanding special environmental conditions. In related technologies, the monitoring method of metal joints of hydrogen pipelines mainly relies on regular inspection and maintenance monitoring and early warning, which has problems of potential safety hazards and low efficiency. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related technologies to some extent. For this reason, an embodiment of the utility model provides a monitoring device for the service state of a hydrogen pipeline and a hydrogen pipeline.

[0004] The monitoring device for the service state of a hydrogen pipeline according to an embodiment of the utility model, the hydrogen pipeline includes a plurality of conveying pipelines and a plurality of joints, and two adjacent conveying pipelines are connected by one of the joints, and includes:

[0005] A sleeve, the sleeve is sleeved on at least part of the outer peripheral side of the joint and at least part of the outer peripheral side of the conveying pipeline, and the inner surface of the sleeve and at least part of the outer surface of the joint and at least part of the outer surface of the conveying pipeline define a monitoring cavity;

[0006] A hydrogen concentration detector, the hydrogen concentration detector is arranged in the monitoring cavity, and the hydrogen concentration detector is used to detect the hydrogen concentration in the monitoring cavity;

[0007] A displacement sensor, the displacement sensor is used to detect the displacement change value between the connected joint and the conveying pipeline.

[0008] Therefore, the monitoring device for the service state of a hydrogen pipeline according to an embodiment of the utility model has the advantages of high safety and high reliability.

[0009] The monitoring device for the service state of a hydrogen pipeline according to an embodiment of the utility model includes

[0010] An alarm system, the alarm system can send out early warning signals and alarm signals;

[0011] Data processing system, the data processing system includes a data receiving unit, a data processing unit and a data storage unit, the data receiving unit is connected to the data processing unit, the data storage unit, the hydrogen concentration detector and the displacement sensor, and the data processing unit is connected to the alarm system;

[0012] The data receiving unit is configured to receive the hydrogen concentration data detected by the hydrogen concentration detector and the displacement change value data detected by the displacement sensor;

[0013] The data processing unit can process the received hydrogen concentration data and displacement change value data. When the value of the received hydrogen concentration data is greater than or equal to the first preset value, the data processing unit controls the alarm system to send an alarm signal. When the value of the received hydrogen concentration data is less than the first preset value and the value of the displacement change value data is greater than or equal to the second preset value, the data processing unit controls the alarm system to send a warning signal or an alarm signal;

[0014] The data storage unit is used to store the hydrogen concentration data and the displacement change value data.

[0015] In some embodiments, the alarm system includes an audible and visual alarm provided on the outer surface of the casing and an alarm device provided in the control room;

[0016] During the commissioning phase of the hydrogen pipeline, the acquisition frequency of the data receiving unit is once every fifth preset time;

[0017] During the operation phase of the hydrogen pipeline, the acquisition frequency of the data receiving unit is once every sixth preset time, and the value of the fifth preset time is less than the value of the sixth preset time.

[0018] In some embodiments, the fifth preset time is greater than or equal to 1 minute and less than or equal to 10 minutes;

[0019] The sixth preset time is greater than or equal to 20 minutes and less than or equal to 60 minutes.

[0020] In some embodiments, the conveying pipeline is a non-metallic pipeline and the joint is a metal joint;

[0021] The hydrogen concentration detector is provided at the top of the monitoring chamber;

[0022] The displacement sensor is located in the monitoring chamber, and the displacement sensor includes at least one of a wire encoder, a grating scale, a capacitive grating scale and a laser sensor.

[0023] In some embodiments, the displacement sensor includes a first detection end and a second detection end. The first detection end is fixed to the corresponding joint, and the second detection end is fixed to a fixing member on the conveying pipeline connected to the joint. The first detection end and the second detection end are spaced apart in the length direction of the conveying pipeline, and the displacement sensor can detect the displacement change value between the first detection end and the second detection end.

[0024] In some embodiments, the sleeve includes a first sub-sleeve and a second sub-sleeve. The first sub-sleeve and the second sub-sleeve can be joined together to form the sleeve. Each of the first sub-sleeve and the second sub-sleeve includes an arc-shaped plate, a first arc-shaped plate, and a second arc-shaped plate. The arc-shaped plate extends in a seventh direction, which is consistent with the extending direction of the hydrogen transmission pipeline. The inner wall surfaces at both ends of the arc-shaped plate in the seventh direction are respectively connected to the first arc-shaped plate and the second arc-shaped plate.

[0025] In some embodiments, connecting plates are provided at both circumferential ends of the arc-shaped plate. A plurality of connecting holes spaced apart in the seventh direction are provided on the connecting plates. A plurality of bolts passing through the connecting holes on the first sub-sleeve and the connecting holes on the second sub-sleeve can join the first sub-sleeve and the second sub-sleeve together to form the sleeve.

[0026] In some embodiments, the first arc-shaped plates on the first sub-sleeve and the first arc-shaped plates on the second sub-sleeve can define a first through hole for accommodating the joint;

[0027] The second arc-shaped plates on the first sub-sleeve and the second arc-shaped plates on the second sub-sleeve can define a second through hole for accommodating the conveying pipeline. The diameter of the first through hole is larger than that of the second through hole;

[0028] Elastic members are provided on the inner surfaces of the first arc-shaped plate and the second arc-shaped plate.

[0029] The present utility model also proposes a hydrogen transmission pipeline, including the above-mentioned hydrogen transmission pipeline service status monitoring device. Description of the Drawings

[0030] Figure 1 is a schematic diagram of a hydrogen transmission pipeline service status monitoring device according to an embodiment of the present utility model.

[0031] Figure 2 is a first side view of a sleeve according to an embodiment of the present utility model.

[0032] Figure 3 is a second side view of a sleeve according to an embodiment of the present utility model.

[0033] Figure 4 It is a schematic diagram of the first sub-casing according to an embodiment of the present utility model.

[0034] Reference numerals: 1, conveying pipeline; 2, joint; 3, casing; 31, first sub-casing; 32, second sub-casing; 33, arc plate; 34, first arc plate; 35, second arc plate; 4, hydrogen concentration detector; 5, displacement sensor; 51, first detection end; 52, second detection end; 6, audible and visual alarm. Detailed implementation manners

[0035] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0036] The hydrogen pipeline service state monitoring device according to an embodiment of the present utility model will be described below with reference to the drawings. The hydrogen pipeline includes a plurality of conveying pipelines 1 and a plurality of joints 2. Adjacent two conveying pipelines 1 are connected by one joint 2. Specifically, the conveying pipeline 1 is a non-metal pipeline, and the joint 2 is a metal joint.

[0037] As Figures 1 to 4 shown, the hydrogen pipeline service state monitoring device according to an embodiment of the present utility model includes a casing 3, a hydrogen concentration detector 4 and a displacement sensor 5.

[0038] The casing 3 is sleeved on at least part of the outer peripheral side of the joint 2 and part of the outer peripheral side of the conveying pipeline 1. The inner surface of the casing 3 and at least part of the outer surface of the joint 2 and part of the outer surface of the conveying pipeline 1 define a monitoring cavity. Specifically, the casing 3 is sleeved on at least part of the outer peripheral side of the joint 2 and part of the outer peripheral side of the conveying pipeline 1 connected to the casing 3. For example, the joint 2 is connected to two conveying pipelines 1. The extending direction of the hydrogen pipeline is the front-back direction. The front end of the joint 2 can extend out of the front end face of the casing 3, and the front end of the conveying pipeline 1 located at the rear side connected to the casing 3 is located in the monitoring cavity. A casing 3 is provided outside each joint 2.

[0039] The hydrogen concentration detector 4 is arranged in the monitoring cavity, and the hydrogen concentration detector 4 is used to detect the hydrogen concentration in the monitoring cavity. The displacement sensor 5 is used to detect the displacement change value between the connected joint 2 and the conveying pipeline 1.

[0040] According to the hydrogen transmission pipeline service status monitoring device of the embodiment of the present utility model, a sleeve 3 is arranged on the outer peripheral side of the joint 2 and a part of the transmission pipeline 1, so that a monitoring cavity is defined between the sleeve 3 and the outer surfaces of the joint 2 and a part of the transmission pipeline 1, that is, the sleeve 3 can define a monitoring cavity with the outer surface at the connection of the joint 2 and the transmission pipeline 1. The connection (monitoring cavity) between the joint 2 and the transmission pipeline 1 is a position prone to leakage. A hydrogen concentration detector 4 is arranged in the monitoring cavity, so that the hydrogen concentration detector 4 can easily detect the leaked hydrogen concentration.

[0041] And a displacement sensor 5 is used to detect the displacement change value between the connected joint 2 and the transmission pipeline 1. After the displacement change value between the joint 2 and the transmission pipeline 1 is large, the probability of leakage at the connection of the joint 2 and the transmission pipeline 1 increases. Through the data detected by the displacement sensor 5 and the hydrogen concentration detector 4, it is convenient to judge the state (deformation condition) of the connection between the corresponding joint 2 and the transmission pipeline 1, so as to easily discover the state and damage condition of the joint, prevent leakage or accidents caused by joint failure, and thus improve safety. And it has high reliability, monitors the state of the joint 2 in real time, reduces the dependence on manual inspection, and improves the reliability and stability of the pipeline system. The cost of manual inspection is reduced, and the operation efficiency and economy of the hydrogen transmission pipeline are improved.

[0042] Therefore, the hydrogen transmission pipeline service status monitoring device according to the embodiment of the present utility model has the advantages of high safety and high reliability.

[0043] In some embodiments, the hydrogen transmission pipeline service status monitoring device includes an alarm system and a data processing system.

[0044] The alarm system can issue a warning signal and an alarm signal. Specifically, the alarm system includes an audible and visual alarm 6 arranged on the outer surface of the sleeve 3 and an alarm device arranged in the control room. The audible and visual alarm 6 located on the outer surface of the sleeve 3 can emit an alarm sound and alarm light. For example, the controller of the audible and visual alarm 6 is located at the top of the outer surface of the sleeve 3. After the alarm system issues a warning signal, the audible and visual alarm 6 can emit yellow alarm light, and after the alarm system issues an alarm signal, the audible and visual alarm 6 can emit red alarm light. The alarm device in the control room can facilitate the monitoring staff in the control room to monitor the states of multiple joints 2. The alarm device can be a notification system or other forms of alarm equipment for timely notifying relevant personnel or systems of abnormal states of the joints 2.

[0045] In some embodiments, the data processing system includes a data receiving unit, a data processing unit and a data storage unit. The data receiving unit is connected to the data processing unit, the data storage unit, the hydrogen concentration detector 4 and the displacement sensor 5, and the data processing unit is connected to the alarm system.

[0046] The data receiving unit is used to receive the hydrogen concentration data detected by the hydrogen concentration detector 4 and the displacement change value data detected by the displacement sensor 5. For example, the data receiving unit collects and receives raw data (the hydrogen concentration data detected by the hydrogen concentration detector 4 and the displacement change value data detected by the displacement sensor 5) from various data sources. The data sources can be sensors, databases, files, network interfaces, etc. The data receiving unit may need to perform some preliminary format conversions or preprocessing to ensure that the data can be correctly read and understood by the subsequent data processing unit.

[0047] The data processing unit is responsible for cleaning, transforming, analyzing, and calculating the received data. Data processing can include removing invalid or incorrect data (data cleaning), converting the data into a format suitable for analysis (data transformation), performing statistical analysis or machine learning algorithms (data analysis), etc. The goal of data processing is to extract useful information or insights to support decision-making or further business operations.

[0048] The data processing unit can process the received hydrogen concentration data and displacement change value data. When the value of the received hydrogen concentration data is greater than or equal to the first preset value, the data processing unit controls the alarm system to issue an alarm signal. Specifically, the first preset value is the set hydrogen leakage safety value. When the hydrogen concentration in the monitoring chamber exceeds the first preset value, it indicates that more hydrogen is leaking from the joint 2 and the conveying pipeline 1, and maintenance is required. At this moment, the data processing unit controls the alarm system to issue an alarm signal, and after the staff receives the alarm signal, it is convenient to repair the corresponding joint 2. For example, the data processing unit is implemented by devices such as a microprocessor or a computer, has the ability to process displacement data in real time, and can perform status evaluation according to the set threshold.

[0049] When the value of the received hydrogen concentration data is less than the first preset value and the value of the displacement change value data is greater than or equal to the second preset value, the data processing unit controls the alarm system to issue a warning signal or an alarm signal. When the hydrogen concentration in the monitoring chamber does not reach the first preset value and the value of the displacement change value data is greater than or equal to the second preset value, it indicates that the displacement between the joint 2 and the conveying pipeline 1 is relatively large, and the probability of leakage is relatively high. At this moment, the data processing unit controls the alarm system to issue a warning signal or an alarm signal, and after the staff receives the warning signal, it is convenient to repair the corresponding joint 2.

[0050] The data storage unit is used to store the hydrogen concentration data and the displacement change value data, so as to call historical data for long-term tracking and analysis of the displacement change of the metal joint 2. For example, the data storage unit can be set on the sleeve 3 to ensure that the data storage capacity meets the requirement of storing all data during the pipeline service life.

[0051] In some embodiments, during the commissioning phase of the hydrogen pipeline, the acquisition frequency of the data receiving unit is once every fifth preset time. Specifically, the fifth preset time is greater than or equal to 1 minute and less than or equal to 10 minutes. For example, during the commissioning phase of the hydrogen pipeline, the acquisition frequency of the data receiving unit is once every 5 minutes.

[0052] During the operation phase of the hydrogen pipeline, the acquisition frequency of the data receiving unit is once every sixth preset time, and the value of the fifth preset time is less than the value of the sixth preset time. Specifically, the sixth preset time is greater than or equal to 20 minutes and less than or equal to 60 minutes. For example, during the operation phase of the hydrogen pipeline, the acquisition frequency of the data receiving unit is once every 30 minutes.

[0053] In some embodiments, the hydrogen concentration detector 4 is provided at the top of the monitoring chamber, so as to facilitate quickly measuring the hydrogen concentration in the monitoring chamber.

[0054] In some embodiments, the displacement sensor 5 is located in the monitoring chamber. The displacement sensor 5 includes at least one of a wire rope encoder, a grating scale, a capacitive grating scale, and a laser sensor. Specifically, the displacement sensor 5 includes a first detection end 51 and a second detection end 52. The first detection end 51 is fixed on the corresponding joint 2 (outer surface), and the second detection end 52 is fixed on a fixing member on the conveying pipeline 1 connected to the joint 2. The first detection end 51 and the second detection end 52 are spaced apart in the length direction of the conveying pipeline 1, and the displacement sensor 5 can detect the displacement change value between the first detection end 51 and the second detection end 52. For example, the displacement sensor 5 is a wire rope encoder and is equipped with a fixing member. The fixing member is connected to the second detection end 52 of the displacement sensor 5 for fixing one end of the displacement sensor 5 on the non-metallic pipeline and has a zero adjustment function to eliminate the initial error, ensuring the accuracy and stability of the measurement. The material selection of the wire rope encoder and the fixing member needs to have the characteristic of hydrogen corrosion resistance to ensure stable working performance in a long-term hydrogen environment.

[0055] As Figures 2 to 4 shown, the sleeve 3 includes a first sub-sleeve 31 and a second sub-sleeve 32, and the first sub-sleeve 31 and the second sub-sleeve 32 can be joined together to form the sleeve 3. For example, the first sub-sleeve 31 and the second sub-sleeve 32 can be joined together in the left-right direction.

[0056] Each of the first sub-sleeve 31 and the second sub-sleeve 32 includes an arc plate 33, a first arc plate 34, and a second arc plate 35. The arc plate 33 extends along a seventh direction, and the seventh direction is the same as the extending direction of the hydrogen pipeline. The inner wall surfaces at both ends of the arc plate 33 in the seventh direction are respectively connected to the first arc plate 34 and the second arc plate 33. Specifically, the first arc plate 34 can be attached to the outer peripheral surface of the joint 2, and the second arc plate 35 is attached to the outer peripheral surface of the conveying pipeline 1, so as to facilitate forming the monitoring chamber.

[0057] In some embodiments, connection plates are provided at both circumferential ends of the arc-shaped plate 33. A plurality of connection holes are provided on the connection plates and are spaced apart in the seventh direction. A plurality of bolts passing through the connection holes on the first sub-casing 31 and the connection holes on the second sub-casing 32 can join the first sub-casing 31 and the second sub-casing 32 to form the casing 3. That is to say, the first sub-casing 31 and the second sub-casing 32 can be connected by bolts, thus facilitating disassembly. For example, connection plates are provided at both the upper and lower ends of the arc-shaped plate 33.

[0058] In some embodiments, the first arc-shaped plates 34 on the first sub-casing 31 and the first arc-shaped plates 34 on the second sub-casing 32 can define a first through-hole for accommodating the joint 2. The second arc-shaped plates 35 on the first sub-casing 31 and the second arc-shaped plates 35 on the second sub-casing 32 can define a second through-hole for accommodating the conveying pipeline 1, and the diameter of the first through-hole is larger than the diameter of the second through-hole. Specifically, the shape and size of the first through-hole are adapted to the outer peripheral surface of the corresponding part of the joint 2, and the shape and size of the second through-hole are adapted to the outer peripheral surface of the corresponding part of the conveying pipeline 1, so that the tightness of the monitoring chamber can be relatively good.

[0059] In some embodiments, elastic members are provided on the inner surfaces of the first arc-shaped plate 34 and the inner surface of the second arc-shaped plate 33. The elastic members can form a buffer between the casing 2 and the joint 2 and the conveying pipeline 1. For example, the elastic member is a rubber member.

[0060] The present utility model also proposes a hydrogen transmission pipeline. The hydrogen transmission pipeline according to the embodiments of the present utility model includes the hydrogen transmission pipeline service state monitoring device according to the embodiments of the present utility model, which has the advantages of high safety and high reliability.

[0061] Therefore, the hydrogen transmission pipeline service state monitoring device according to the embodiments of the present utility model has the advantages of high safety and high reliability.

[0062] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 construed as a limitation of the present utility model.

[0063] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0064] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0065] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0066] In the present utility model, terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0067] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. A hydrogen pipeline service status monitoring device, the hydrogen pipeline comprising a plurality of delivery pipelines and a plurality of joints, two adjacent delivery pipelines being connected via one of the joints, characterized in that: include: A sleeve, the sleeve being sleeved on at least a portion of the outer circumference of the joint and a portion of the outer circumference of the delivery pipe, wherein the inner surface of the sleeve and at least a portion of the outer surface of the joint and a portion of the outer surface of the delivery pipe define a monitoring cavity; A hydrogen concentration detector, which is disposed in the monitoring cavity and is used to detect the hydrogen concentration in the monitoring cavity; A displacement sensor is used to detect a displacement change value between the connected joint and the conveying pipeline.

2. The hydrogen pipeline service status monitoring device according to claim 1, characterized in that: include An alarm system, which can send out early warning signals and alarm signals; A data processing system, the data processing system comprises a data receiving unit, a data processing unit and a data storage unit, the data receiving unit is connected to the data processing unit, the data storage unit, the hydrogen concentration detector and the displacement sensor, and the data processing unit is connected to the alarm system; The data receiving unit is used to receive the hydrogen concentration data detected by the hydrogen concentration detector and the displacement change value data detected by the displacement sensor; The data processing unit can process the received hydrogen concentration data and displacement change value data. When the value of the received hydrogen concentration data is greater than or equal to a first preset value, the data processing unit controls the alarm system to send an alarm signal. When the value of the received hydrogen concentration data is less than the first preset value and the value of the displacement change value data is greater than or equal to a second preset value, the data processing unit controls the alarm system to send a warning signal or an alarm signal. The data storage unit is used to store hydrogen concentration data and displacement change value data.

3. The hydrogen pipeline service status monitoring device according to claim 2, characterized in that: The alarm system includes an audible and visual alarm arranged on the outer surface of the casing and an alarm device arranged in the control room; During the commissioning phase of the hydrogen transmission pipeline, the data receiving unit collects data at a frequency of once during a fifth preset time; During the operation phase of the hydrogen transmission pipeline, the data receiving unit collects data at a frequency of once per a sixth preset time, and the value of the fifth preset time is smaller than the value of the sixth preset time.

4. The hydrogen pipeline service status monitoring device according to claim 3 is characterized in that: The fifth preset time is greater than or equal to 1 minute and less than or equal to 10 minutes; The sixth preset time is greater than or equal to 20 minutes and less than or equal to 60 minutes.

5. The hydrogen pipeline service status monitoring device according to claim 1, characterized in that: The delivery pipeline is a non-metallic pipeline, and the joint is a metal joint; The hydrogen concentration detector is arranged at the top of the monitoring chamber; The displacement sensor is located in the monitoring cavity, and the displacement sensor includes at least one of a wire encoder, a grating scale, a capacitive scale and a laser sensor.

6. The hydrogen pipeline service status monitoring device according to claim 5, characterized in that: The displacement sensor includes a first detection end and a second detection end, the first detection end is fixed on the corresponding joint, and the second detection end is fixed on a fixing member on the conveying pipe connected to the joint, and the first detection end and the second detection end are spaced apart in the length direction of the conveying pipe. The displacement sensor can detect the displacement change value between the first detection end and the second detection end.

7. The hydrogen pipeline service status monitoring device according to any one of claims 1 to 6, characterized in that: The casing includes a first sub-casing and a second sub-casing, and the first sub-casing and the second sub-casing can be assembled to form the casing. Each of the first sub-casing and the second sub-casing includes an arc plate, a first arc plate and a second arc plate. The arc plate extends along a seventh direction, and the seventh direction is consistent with the extension direction of the hydrogen transmission pipeline. The arc plate is respectively connected to the first arc plate and the second arc plate on the inner wall surfaces at both ends of the seventh direction.

8. The hydrogen pipeline service status monitoring device according to claim 7, characterized in that: Both ends of the arc plate in the circumferential direction are provided with connecting plates, and the connecting plates are provided with a plurality of connecting holes spaced apart in the seventh direction. A plurality of bolts passing through the connecting holes on the first sub-casing and the connecting holes on the second sub-casing can combine the first sub-casing and the second sub-casing to form the casing.

9. The hydrogen pipeline service status monitoring device according to claim 7, characterized in that: The first arc-shaped plate on the first sub-casing and the first arc-shaped plate on the second sub-casing may define a first through hole for accommodating the joint; The second arc-shaped plate on the first sub-casing and the second arc-shaped plate on the second sub-casing may define a second through hole for accommodating the delivery pipe, and the diameter of the first through hole is greater than the diameter of the second through hole; Elastic parts are arranged on the inner surface of the first arc-shaped plate and the inner surface of the second arc-shaped plate stop.

10. A hydrogen transmission pipeline, characterized in that: The invention comprises the hydrogen pipeline service status monitoring device according to any one of claims 1 to 9.

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