A method, device and system for detecting a leakage point of a pressure maintaining pipeline

Abstract

The application relates to the technical field of pipeline detection, in particular to a gas leakage point detection method, device and system for a pressure maintaining pipeline, which comprises the following steps: obtaining monitoring point data, the monitoring point being represented by a monitoring point position obtained after a sensor is embedded in the pipeline, wherein a plurality of monitoring points are arranged at intervals along the length direction of the pipeline, and the monitoring point data at least comprises a position of the monitoring point and a gas pressure value detected by the monitoring point; calculating a difference value of the gas pressure value in the monitoring point data of adjacent monitoring points, and judging whether a gas leakage point exists according to whether the difference value is abnormal; if the difference value is abnormal, obtaining the position of the gas leakage point according to the position of the monitoring point corresponding to the abnormal difference value. The application has the effect of low cost, simple operation and quick finding of a gas leakage point in a natural gas pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline detection, in particular to a method, device and system for detecting a leakage point of a pressure maintaining pipeline. BACKGROUND

[0002] In the construction of new housing or industrial park, it is necessary to bury natural gas pipelines. After the burial is completed, a specific gas is generally introduced for pressure maintenance. Pressure maintenance refers to sealing the pipeline and, after all pipelines and supporting facilities in the housing or park are completed, the pressure maintaining gas (usually inert gas) is discharged and natural gas is introduced.

[0003] However, during the pressure maintenance process, the pipeline is often dug up by the construction team. On the one hand, sometimes the pipeline is dug up by the construction team, and the construction team often does not report it, resulting in the pipeline being in a damaged state. On the other hand, if the pipeline is damaged, it is difficult for the construction team to find the crack or crack, so it is difficult to find the damage point of the pipeline.

[0004] In related technologies, there is a natural gas inspection robot disclosed in a utility model patent with the announcement number CN207540589U. The robot is placed in the pressure maintaining pipeline, and the robot walks along the preset route for inspection to detect the real-time parameters of each position in the pipeline in real time to determine whether there is leakage.

[0005] However, the natural gas inspection robot in the above scheme is very expensive, and using the above scheme to detect the leakage point of the pipeline will greatly increase the engineering cost. At the same time, because the transfer speed of the natural gas inspection robot is limited, it takes a long time to detect the complete pipeline. SUMMARY

[0006] The purpose of the present application is to find the leakage point of the natural gas pipeline at low cost, simply and quickly.

[0007] In a first aspect, the present application provides a method for detecting a leakage point of a pressure maintaining pipeline, which adopts the following technical scheme:

[0008] A method for detecting a leakage point of a pressure maintaining pipeline, comprising the following steps:

[0009] Obtaining monitoring point data, the monitoring point being a monitoring point position obtained after a sensor is buried in the pipeline, wherein a plurality of monitoring points are arranged at intervals along the length direction of the pipeline, and the monitoring point data at least includes the position of the monitoring point and the gas pressure value detected by the monitoring point;

[0010] Calculating the difference between the gas pressure values in the monitoring point data of adjacent monitoring points, and determining whether there is a leakage point according to whether the difference is abnormal;

[0011] If the difference value is abnormal, the location of the gas leakage point is obtained according to the location of the monitoring point corresponding to the abnormal difference value.

[0012] In some other embodiments, before the difference value of the air pressure values in the monitoring point data on the adjacent monitoring points is calculated, the method further comprises:

[0013] The monitoring point data on the monitoring points located at the head and the tail of the independent pipeline is obtained, wherein the independent pipeline is a complete pipeline without any corner, branch or merging point;

[0014] The difference value of the air pressure values on the monitoring point located at the head and the monitoring point located at the tail is calculated;

[0015] It is judged whether the difference value meets a preset value or not;

[0016] If the difference value meets the preset value, the independent pipeline does not need to compare the difference value of the air pressure values on the adjacent monitoring points, and it is defined that the independent pipeline does not have a gas leakage point;

[0017] If the difference value does not meet the preset value, the difference value of the air pressure values in the monitoring point data on the adjacent monitoring points is calculated, and it is judged whether there is a gas leakage point according to whether the difference value is abnormal or not.

[0018] In some other embodiments, the difference value of the air pressure values in the monitoring point data on the adjacent monitoring points is calculated, and it is judged whether there is a gas leakage point according to whether the difference value is abnormal or not, which comprises the following steps:

[0019] A detection direction is defined, and the first monitoring point along the detection direction in the independent pipeline is defined as a first data point, and the adjacent monitoring point of the first data point along the detection direction is defined as a second data point;

[0020] The difference value of the air pressure values corresponding to the first data point and the second data point is calculated, and it is judged whether there is a gas leakage point according to the difference value;

[0021] After the gas leakage point is judged, the current second data point is defined as a new first data point, and the adjacent monitoring point along the detection direction is defined as a new second data point, and the above steps are repeated until the last monitoring point along the detection direction in the independent pipeline is defined as the second data point.

[0022] In some other embodiments, the difference value of the air pressure values corresponding to the first data point and the second data point is calculated, and it is judged whether there is a gas leakage point according to the difference value, which specifically comprises:

[0023] If the difference value is abnormal, it is defined that there is a suspected gas leakage point between the first data point and the second data point;

[0024] If the difference between the new first data point and the new second data point is abnormal, determining the pressure value between the new second data point and the original first data point;

[0025] If there is no abnormality, confirming the suspected leakage point as a definite leakage point and generating corresponding alarm information;

[0026] If there is abnormality, determining the pressure value between the new second data point and the original first data point;

[0027] If the pressure value at the original first data point is greater than the pressure value at the new second data point, confirming the current suspected leakage point as a definite leakage point, generating corresponding alarm information, and defining the position between the new first data point and the new second data point as a suspected leakage point;

[0028] If the pressure value at the original first data point is equal to the pressure value at the new second data point, redefining the current suspected leakage point as a device fault point and generating corresponding maintenance information.

[0029] In some other embodiments, the method further comprises the following steps:

[0030] The monitoring point generates a trigger signal to the adjacent monitoring point to determine whether there are several adjacent monitoring points on both sides of the monitoring point, and if there is only one adjacent monitoring point on both sides of the monitoring point, determining whether the adjacent monitoring point is along the detection direction;

[0031] If along the detection direction, the monitoring point generates a first communication instruction and a second communication instruction, the first communication instruction is used to make itself emit the detected pressure value and define it as a first data point, and the second communication instruction is used to send to the adjacent monitoring point along the detection direction to make the adjacent monitoring point emit the detected pressure value and define it as a second data point;

[0032] If not along the detection direction, the monitoring point generates a third communication instruction, which is used to make itself stop emitting the detected pressure value;

[0033] If there are adjacent monitoring points on both sides of the monitoring point, the monitoring point generates a second communication instruction, a fourth communication instruction and a fifth communication instruction, wherein the fourth communication instruction is used to send to the adjacent monitoring point opposite to the detection direction to make the adjacent monitoring point stop emitting the detected pressure value, and the fifth communication instruction is used to make itself keep emitting the detected pressure value and redefine its second data point as a new first data point.

[0034] In other embodiments, the first communication instruction, the second communication instruction, the third communication instruction, the fourth communication instruction, and the fifth communication instruction are based on zigbee communication.

[0035] In a second aspect, the application provides a leakage point detection device for a pressure maintaining pipeline, which adopts the following technical solution:

[0036] A leakage point detection device for a pressure maintaining pipeline is fixedly arranged in the pipeline as a monitoring point, and specifically comprises:

[0037] A detection module for detecting the air pressure in a preset range in the pipeline to generate a corresponding air pressure value;

[0038] A position definition module for obtaining position information uploaded by a user and generating a position of the monitoring point based on the position information;

[0039] The air pressure value and the position of the monitoring point jointly constitute monitoring point data.

[0040] In other embodiments, a communication module is further included, which is configured to generate a trigger signal to determine whether there are adjacent leakage point detection devices on both sides, and to generate a corresponding first communication instruction, a second communication instruction, a third communication instruction, a fourth communication instruction, and a fifth communication instruction, and the communication module is based on zigbee communication.

[0041] In a third aspect, the application provides a leakage point detection system for a pressure maintaining pipeline, which adopts the following technical solution:

[0042] A leakage point detection system for a pressure maintaining pipeline comprises a plurality of leakage point detection devices arranged along the length direction of the pipeline, and is configured to implement the leakage point detection method described above.

[0043] In summary, the application has at least one of the following beneficial technical effects:

[0044] The leakage point can be quickly found, and only a plurality of detection devices arranged along the length direction of the pipeline are needed to compare the air pressure value difference between adjacent monitoring points to find the leakage point, which is low in cost and more rapid and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a schematic diagram of the overall process of the leakage point detection method in the application;

[0046] Figure 2 is a schematic diagram illustrating the communication instructions in N1-N5 five monitoring points working in sequence. DETAILED DESCRIPTION

[0047] The application will be further described below in conjunction with the accompanying drawings. Figure 1 - the accompanying drawings Figure 2 , which illustrate the present application.

[0048] As shown in the drawings, the application discloses a method for detecting a leakage point of a pressure maintaining pipeline, comprising the following steps: Figure 1

[0049] S100, acquiring monitoring point data, the monitoring point data at least comprising a position of a monitoring point and a detected air pressure value of the monitoring point.

[0050] The monitoring point is characterized by a monitoring point position obtained after a sensor or other detection device is embedded in the pipeline. The pipeline is provided with a plurality of monitoring points at intervals along the length direction.

[0051] The position of the monitoring point can be uploaded directly with the position information thereof and associated with each monitoring point according to the position corresponding to the number corresponding to different monitoring points, so that when an anomaly occurs near a certain monitoring point, the position of the monitoring point can be directly known.

[0052] The air pressure value is a key value for judging whether a leakage occurs. When a leakage occurs at a position, the difference in the value on the monitoring points near the leakage point will be abnormal.

[0053] S200, calculating the difference in the air pressure value in the monitoring point data on adjacent monitoring points, and judging whether a leakage point exists according to whether the difference is abnormal.

[0054] The adjacent monitoring points are characterized by two adjacent monitoring points. If a leakage point exists, the difference in the air pressure value between the adjacent monitoring points on the two sides of the leakage point will be abnormal, which means that the difference is greater than a preset value.

[0055] When no leakage point exists, the difference in the air pressure value between the two adjacent monitoring points should be 0 or close to 0. If the difference in the air pressure value between the two monitoring points is very large, it means that a leakage point exists between the two monitoring points. Because the inert gas leaks from the leakage point, the size of the air pressure value will change, and thus an abnormal difference will occur.

[0056] S300, if the abnormal difference exists, acquiring the position of the leakage point according to the position of the monitoring point corresponding to the abnormal difference.

[0057] After the existence of the leakage point is confirmed through the calculation and comparison of the difference, the position of the leakage point is determined according to the position of the monitoring point corresponding to the abnormal difference. Because the leakage point is determined by the two adjacent monitoring points, the positions of the two monitoring points are obtained, and the maintenance personnel can know that the approximate position of the leakage point in the pipeline is between the two monitoring points. ​

[0058] Through the above method, the quick search of the leakage point is realized, and only a plurality of detection devices are arranged along the length direction of the pipeline, and the leakage point can be searched by comparing the pressure value difference between adjacent monitoring points, which is low in cost and more rapid and convenient.

[0059] In some other embodiments, before calculating the difference of the pressure values in the monitoring point data on the adjacent monitoring points, the method further comprises:

[0060] S110, obtaining monitoring point data on monitoring points located at the head and tail of an independent pipeline, the independent pipeline being characterized by being a complete pipeline without turning, branching and merging.

[0061] S120, calculating the difference of the pressure values on the monitoring points located at the head and tail.

[0062] S130, judging whether the difference meets a preset value.

[0063] S140, if yes, the independent pipeline does not need to compare the pressure value difference between adjacent monitoring points, and it is defined that there is no leakage point in the independent pipeline.

[0064] S150, if no, calculating the difference of the pressure values in the monitoring point data on the adjacent monitoring points, and judging whether there is a leakage point according to whether the difference is abnormal.

[0065] Firstly, the independent pipeline is determined. There can be a plurality of independent pipelines in one pipeline. When the pipeline appears turning, branching, merging and the like along the length direction, the pipeline before the appearance of the above-mentioned situations is an independent pipeline, and the pipeline corresponding to the appearance of the above-mentioned situations to the subsequent appearance of the above-mentioned situations is another independent pipeline.

[0066] Secondly, it is judged whether the difference of the pressure values corresponding to the monitoring points located at the two heads of the independent pipeline is abnormal, that is, whether the difference is greater than a preset value. If the difference between the monitoring points located at the two heads is zero or very small and does not exceed the preset value, it is indicated that the independent pipeline does not have a leakage point. However, if the difference between the monitoring points located at the two heads is very large, it is indicated that the independent pipeline has one or more leakage points.

[0067] When it is determined that the independent pipeline does not have a leakage point, in order to reduce the processing amount of data comparison processing and save detection time, it is not necessary to compare the differences of the adjacent monitoring points on the independent pipeline.

[0068] In some other embodiments, calculating the difference of the pressure values in the monitoring point data on the adjacent monitoring points, and judging whether there is a leakage point according to whether the difference is abnormal, comprises the following steps:

[0069] S210, define a detection direction, and take the first detection point along the detection direction in the independent pipeline as a first data point, and take the adjacent monitoring point along the detection direction of the first data point as a second data point.

[0070] S211, calculate the difference of the gas pressure values corresponding to the first data point and the second data point, and determine whether there is a gas leakage point through the difference.

[0071] S212, after determining the gas leakage point, take the current second data point as a new first data point, and take the adjacent monitoring point along the detection direction as a new second data point, and repeat the above steps until the last monitoring point along the detection direction in the independent pipeline is taken as the second data point.

[0072] For example, there are five monitoring points on an independent pipeline, which are N1, N2, N3, N4 and N5. First, a detection direction is set, which is generally from the natural gas supply end to the natural gas receiving end. N1 is taken as the first data point, and N2 adjacent to N1 is taken as the second data point. Then, the difference of the gas pressure values corresponding to N1 and N2 is compared, and whether there is a gas leakage point between N1 and N2 is determined according to the difference. After the comparison, N2 is taken as a new first data point, N3 is taken as a new second data point, and the difference calculation and comparison are performed again until N5 is taken as the second data point, and the difference calculation and comparison between each adjacent monitoring point are realized in turn.

[0073] In some other embodiments, the difference of the gas pressure values corresponding to the first data point and the second data point is calculated, and whether there is a gas leakage point is determined through the difference, specifically including:

[0074] S2111, if the difference is abnormal, it is defined that there is a suspected gas leakage point between the first data point and the second data point.

[0075] S2112, take the current second data point as a new first data point, and take the adjacent monitoring point along the detection direction as a new second data point, and determine whether the difference between the new first data point and the new second data point is abnormal.

[0076] S2113, if there is no abnormality, the suspected gas leakage point is confirmed as an explicit gas leakage point, and corresponding alarm information is generated.

[0077] S2114, if there is an abnormality, the gas pressure values between the new second data point and the original first data point are determined.

[0078] S2115, if the air pressure value at the original first data point is greater than the air pressure value at the new second data point, then the current suspected leak point is confirmed as a clear leak point, corresponding alarm information is generated, and a suspected leak point is defined at the location between the new first data point and the new second data point.

[0079] S2116 If the air pressure value at the original first data point is equal to the air pressure value at the new second data point, then the current suspected leak point is redefined as the equipment fault point, and corresponding maintenance information is generated.

[0080] When the difference between adjacent monitoring points is abnormal, there may be two situations: one is that there is a leak, and the other is that the detection device at some monitoring points is damaged.

[0081] When an abnormal difference occurs, the two monitoring points corresponding to that difference are defined as a suspected leak point. At this point, it is uncertain whether it is definitely a leak point and further judgment is required.

[0082] For example, if there is a suspected leak between N1 and N2, N2 is used as the new first data point and N3 is used as the new second data point to judge the difference again. If there is no abnormality in the difference between N2 and N3, it means that the pressure difference between N2 and N3 is the same or very similar. In the case that there is an abnormality between N1 and N2, but no abnormality between N2 and N3, it means that the suspected leak between N1 and N2 can be confirmed as a leak.

[0083] If the difference between N2 and N3 is also abnormal, there are two possibilities. One possibility is that the pressure value of N3 is the same as or similar to the pressure value of N1. This means that there is no leak in the pipeline segment from N1 to N3. In this case, theoretically, the value at the monitoring point of N2 should not change significantly. Therefore, in this case, it is determined that N2 is faulty and maintenance information is generated.

[0084] If there is an anomaly between the gas pressure values ​​of N3 and N1, it can be concluded that there is a leak between N1 and N2. This is because only with a leak would the gas pressure at N3 change when the remaining gas reaches N3, resulting in a difference from N1. Furthermore, since it's uncertain whether there is a leak between N2 and N3—because the gas pressure at N3 will be different from that at N1 regardless of its presence—a suspected leak point needs to be defined between N2 and N3, and its existence will be analyzed through subsequent checks.

[0085] like Figure 2 As shown, in some other embodiments, the following steps are also included:

[0086] S400, monitoring point generates a trigger signal to the adjacent monitoring point to determine whether there are several adjacent monitoring points on both sides, if there is only one adjacent monitoring point on both sides of the monitoring point, it is determined whether the adjacent monitoring point is along the detection direction.

[0087] S410, if along the detection direction, the monitoring point generates a first communication instruction and a second communication instruction, the first communication instruction is used to make itself start detection and define as a first data point, and the second communication instruction is used to send to the adjacent monitoring point along the detection direction, so that the adjacent monitoring point sends the detected air pressure value and defines as a second data point.

[0088] S420, if not along the detection direction, the monitoring point generates a third communication instruction, which is used to make itself stop sending the detected air pressure value.

[0089] S430, if there are adjacent monitoring points on both sides of the monitoring point, the monitoring point generates a second communication instruction, a fourth communication instruction and a fifth communication instruction, wherein the fourth communication instruction is used to send to the adjacent monitoring point opposite to the detection direction to make the adjacent monitoring point stop sending the detected air pressure value, and the fifth communication instruction is used to make itself keep sending the detected air pressure value and redefine its second data point as a new first data point.

[0090] When the air pressure value detection and the comparison between adjacent monitoring points are carried out, the principle followed is that there are at most two monitoring points in the whole process to compare the air pressure value, and the remaining monitoring points remain in a silent state, only keeping real-time detection of the air pressure value without sending.

[0091] First of all, still taking the five monitoring points N1 to N5 as an example, for N1, the adjacent monitoring point is only one, that is, N2, secondly, N2 is along the detection direction, then N1 sends a first communication instruction to make itself as a first data point, at the same time, the detected air pressure value is sent, at the same time, N1 sends a second communication instruction to N2, the second communication instruction makes N2 as a second data point, and also sends the current detected air pressure value, in this way, N1 and N2 can carry out difference comparison and analysis of the air pressure value.

[0092] After the difference comparison between N1 and N2 is finished, N2 is taken as a reference to make a judgment. If there are monitoring points on both sides of N2, a second communication command is generated to N3 (the adjacent monitoring point in the detection direction), so that N3 becomes a new second data point and sends the detected air pressure value, a fourth communication command is sent to N2 (the adjacent monitoring point in the opposite direction of the detection direction), so that N2 stops sending the detected air pressure value, the first data point definition of N2 is cancelled, and a fifth communication command is sent to itself, so that itself changes from the second data point in the last comparison to a new first data point, and continues to send the detected air pressure value, and the difference comparison analysis is performed with the air pressure value sent by N3.

[0093] By analogy, until the difference comparison between N4 and N5 is finished. At this time, N5 is the last monitoring point on the independent pipeline, and the only adjacent monitoring point of N5 is N4, which is the adjacent monitoring point in the opposite direction of the detection direction. At this time, N5 generates a third communication command to itself, so that itself stops sending the detected air pressure value, and the air pressure value comparison work of the entire independent pipeline is finished.

[0094] In this way, the number of data analysis can be effectively reduced, and the speed of data analysis can be accelerated. At the same time, without using the method of comparing all monitoring points at the same time, the detection accuracy can be better and more detailed.

[0095] In other embodiments, the first communication command, the second communication command, the third communication command, the fourth communication command, and the fifth communication command are based on zigbee communication. Based on zigbee communication, the energy consumption can be effectively reduced.

[0096] The application also discloses a leakage point detection device of a pressure maintaining pipeline, which is fixedly arranged in the pipeline to serve as a monitoring point, and specifically comprises:

[0097] A detection module is configured to detect the air pressure in a preset range in the pipeline to generate a corresponding air pressure value.

[0098] A position definition module is configured to obtain position information uploaded by a user and generate a position of the monitoring point based on the position information.

[0099] The air pressure value and the position of the monitoring point jointly constitute monitoring point data.

[0100] In other embodiments, the communication module is further configured to generate a trigger signal to determine whether there are adjacent leakage point detection devices on both sides, and to generate a corresponding first communication command, a second communication command, a third communication command, a fourth communication command, and a fifth communication command. The communication module is based on zigbee communication.

[0101] This application also discloses a leak detection system for pressure-holding pipelines, including several leak detection devices arranged along the length of the pipeline, for implementing the above-mentioned leak detection method.

[0102] The implementation principle of this application embodiment is as follows:

[0103] To quickly locate leaks, simply install several detection devices along the length of the pipeline. By comparing the pressure difference between adjacent monitoring points, leaks can be found. This method is lower in cost and faster and more convenient.

[0104] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for detecting leaks in a pressure-maintaining pipeline, characterized in that, Includes the following steps: Acquire monitoring point data, wherein the monitoring point is characterized by the location of the monitoring point obtained after the sensor is buried in the pipeline, wherein a number of monitoring points are set at intervals along the length of the pipeline, and the monitoring point data includes at least the location of the monitoring point and the air pressure value detected by the monitoring point. Calculate the difference in air pressure values ​​between adjacent monitoring points, and determine whether there is an air leak based on whether the difference is abnormal; If it exists, the location of the leak point is obtained based on the location of the monitoring point corresponding to the abnormal difference. Before calculating the difference in air pressure values ​​between adjacent monitoring points, the process also includes: Acquire monitoring point data at monitoring points located at the head and tail of an independent pipeline, wherein the independent pipeline is characterized as a complete pipeline without corners, branching, or merging; Calculate the difference between the air pressure value at the monitoring point located at the head and the air pressure value at the monitoring point located at the tail; Determine whether the difference meets a preset value; If the conditions are met, then the pressure difference between adjacent monitoring points does not need to be compared for this independent pipeline, and it is defined that there is no leak in this independent pipeline. If the conditions are not met, the difference in air pressure values ​​between the monitoring points on adjacent monitoring points is calculated, and the presence of a leak is determined based on whether the difference is abnormal. Calculate the difference in air pressure values ​​between adjacent monitoring points, and determine whether there is an air leak based on whether the difference is abnormal, including the following steps: Define the detection direction, and take the first monitoring point along the detection direction in the independent pipeline as the first data point, and take the adjacent monitoring points along the detection direction as the second data points; Calculate the difference between the air pressure values ​​corresponding to the first data point and the second data point, and use the difference to determine whether there is an air leak. After identifying the leak point, the current second data point is used as the new first data point, and the adjacent monitoring point along the detection direction is used as the new second data point. The above steps are repeated until the last monitoring point along the detection direction in the independent pipeline is used as the second data point. Calculate the difference in air pressure values ​​corresponding to the first data point and the second data point, and use this difference to determine if there is an air leak. Specifically, this includes: If the difference is abnormal, then a suspected air leak point is defined at the location between the first data point and the second data point; The current second data point is used as the new first data point, and the adjacent monitoring points along the detection direction are used as the new second data points again. It is then determined whether there is an anomaly in the difference between the new first data point and the new second data point. If no abnormality is found, the suspected leak point is confirmed as a confirmed leak point, and a corresponding alarm message is generated. If an anomaly is found, determine the air pressure value between the new second data point and the original first data point; If the air pressure value at the original first data point is greater than the air pressure value at the new second data point, then the current suspected leak point is confirmed as a confirmed leak point, a corresponding alarm message is generated, and a suspected leak point is defined at the location between the new first data point and the new second data point. If the air pressure value at the original first data point is equal to the air pressure value at the new second data point, then the current suspected leak point is redefined as a device fault point, and corresponding maintenance information is generated.

2. The leak detection method according to claim 1, characterized in that, It also includes the following steps: The monitoring point generates a trigger signal to the adjacent monitoring point to determine how many adjacent monitoring points exist on both sides of it. If there is only one adjacent monitoring point on both sides of the monitoring point, it is determined whether the adjacent monitoring point is along the detection direction. If along the detection direction, the monitoring point generates a first communication command and a second communication command. The first communication command is used to make itself emit the detected air pressure value and define it as a first data point. The second communication command is used to send to the monitoring point adjacent to it along the detection direction, so that the adjacent monitoring point emits the detected air pressure value and defines it as a second data point. If not along the detection direction, the monitoring point generates a third communication command, which is used to stop itself from sending out the detected air pressure value; If there are adjacent monitoring points on both sides of the monitoring point, the monitoring point generates a second communication command, a fourth communication command, and a fifth communication command. The fourth communication command is used to send to the adjacent monitoring point opposite to the detection direction so that the adjacent monitoring point stops transmitting the detected air pressure value. The fifth communication command is used to keep transmitting the detected air pressure value and redefine its own second data point as a new first data point.

3. The leak detection method according to claim 2, characterized in that, The first communication command, the second communication command, the third communication command, the fourth communication command, and the fifth communication command are all based on Zigbee communication.

4. A leak detection device for a pressure-maintaining pipeline, characterized in that, It is fixedly installed inside the pipeline as a monitoring point, specifically including: The detection module is used to detect the air pressure within a preset range in the pipeline to generate the corresponding air pressure value; The location definition module is used to obtain the location information uploaded by the user and generate the location of the monitoring point based on the location information; The air pressure value and the location of the monitoring point together constitute the monitoring point data; This also includes: Acquire monitoring point data at monitoring points located at the head and tail of an independent pipeline, wherein the independent pipeline is characterized as a complete pipeline without corners, branching, or merging; Calculate the difference between the air pressure value at the monitoring point located at the head and the air pressure value at the monitoring point located at the tail; Determine whether the difference meets a preset value; If the conditions are met, then the pressure difference between adjacent monitoring points does not need to be compared for this independent pipeline, and it is defined that there is no leak in this independent pipeline. If the conditions are not met, the difference in air pressure values ​​between the monitoring points on adjacent monitoring points is calculated, and the presence of a leak is determined based on whether the difference is abnormal. Calculate the difference in air pressure values ​​between adjacent monitoring points, and determine whether there is an air leak based on whether the difference is abnormal, including the following steps: Define the detection direction, and take the first monitoring point along the detection direction in the independent pipeline as the first data point, and take the adjacent monitoring points along the detection direction as the second data points; Calculate the difference between the air pressure values ​​corresponding to the first data point and the second data point, and use the difference to determine whether there is an air leak. After identifying the leak point, the current second data point is used as the new first data point, and the adjacent monitoring point along the detection direction is used as the new second data point. The above steps are repeated until the last monitoring point along the detection direction in the independent pipeline is used as the second data point. Calculate the difference in air pressure values ​​corresponding to the first data point and the second data point, and use this difference to determine if there is an air leak. Specifically, this includes: If the difference is abnormal, then a suspected air leak point is defined at the location between the first data point and the second data point; The current second data point is used as the new first data point, and the adjacent monitoring points along the detection direction are used as the new second data points again. It is then determined whether there is an anomaly in the difference between the new first data point and the new second data point. If no abnormality is found, the suspected leak point is confirmed as a confirmed leak point, and a corresponding alarm message is generated. If an anomaly is found, determine the air pressure value between the new second data point and the original first data point; If the air pressure value at the original first data point is greater than the air pressure value at the new second data point, then the current suspected leak point is confirmed as a confirmed leak point, a corresponding alarm message is generated, and a suspected leak point is defined at the location between the new first data point and the new second data point. If the air pressure value at the original first data point is equal to the air pressure value at the new second data point, then the current suspected leak point is redefined as a device fault point, and corresponding maintenance information is generated.

5. The leak detection device according to claim 4, characterized in that, It also includes a communication module, which is used to generate a trigger signal to determine whether there are adjacent leak detection devices on both sides, and is also used to generate corresponding first communication command, second communication command, third communication command, fourth communication command and fifth communication command. The communication module is based on Zigbee communication.

6. A leak detection system for a pressure-maintaining pipeline, characterized in that, The system includes several leak detection devices arranged along the length of the pipeline, used to implement the leak detection method for a pressure-maintaining pipeline as described in any one of claims 1-3.

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