CN115111535A - Method, system and device for detecting leakage points of water supply pipe network - Google Patents
Method, system and device for detecting leakage points of water supply pipe network Download PDFInfo
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- CN115111535A CN115111535A CN202210775064.3A CN202210775064A CN115111535A CN 115111535 A CN115111535 A CN 115111535A CN 202210775064 A CN202210775064 A CN 202210775064A CN 115111535 A CN115111535 A CN 115111535A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/15—Leakage reduction or detection in water storage or distribution
Abstract
The invention relates to a method, a system and a device for detecting leakage points of a water supply pipe network, wherein the method comprises the following steps: acquiring pressure sensing signals of each pressure sensor, and judging whether a water supply network has a leakage point or not according to the pressure sensing signals; if the leakage point exists, acquiring the pressure drop moment when each pressure sensor detects the instantaneous pressure drop; selecting two pressure sensors as target pressure sensors from all the pressure sensors according to the pressure drop moment, and determining that the position of a leakage point is between the two target pressure sensors; calculating the propagation speed of the pressure wave in the water; and calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors so as to determine the position of the leak point. According to the method, the system and the device, the specific position of the leakage point in the water supply network can be quickly calculated by using the pressure sensing signal, so that the precision and the efficiency of detecting the leakage point of the water supply network are improved.
Description
Technical Field
The invention relates to the technical field of pipe network leakage point detection, in particular to a method, a system and a device for detecting leakage points of a water supply pipe network.
Background
At present to regional water supply network, for example regional cold supply freezing water pipe network, the material is the carbon steel mainly, can appear phenomenons such as pipeline corrosion, construction destruction along with the lapse of time, leads to the pipe network to explode and leak, the phenomenon of leaking appears, if can not in time discover the condition of leaking to confirm the concrete position at leak source place, the maintenance personal can't salvage the very first time so, will cause a large amount of wastes of water resource. Regional water supply network generally includes that the water supply is responsible for, the return water is responsible for and is connected a plurality of bleeder pipes between being responsible for and the return water is responsible for, because the bleeder pipe is numerous, and the structure is complicated relatively, has increased the degree of difficulty that the water supply network leak source detected.
At present, the leakage point detection of a regional water supply pipe network mainly comprises the following two measures: on one hand, flowmeters are arranged on two sides of the pipeline, and a water leakage pipeline section is determined by comparing the difference values of the flowmeters; and on the other hand, a leakage detector is adopted for manual leakage detection.
The mode of installing the flowmeter in pipeline both sides can be according to the flow variation that the flowmeter detected and confirm the pipeline section at leak source place, but can't further confirm the leak source at the concrete position of pipeline section, and it is not high to detect the precision, and because regional cooling bleeder is more, mostly is buried pipe, consequently adopts this mode probably to appear to drop into big, the power supply does not have the guarantee phenomenon. The manual leakage detection method needs to be carried out under the condition of low ambient noise at night, the method is time-consuming and labor-consuming, and the precision of the method depends on the detection level of people. The two modes have certain defects in the aspects of the precision, the efficiency and the like of leak point measurement, and the leak point detection of the water supply network cannot be well realized.
Disclosure of Invention
In order to solve the problems, the invention provides a method, a system and a device for detecting leakage points of a water supply pipe network.
The invention provides a method for detecting leakage points of a water supply network, which is used for detecting the leakage points of the water supply network, wherein the water supply network comprises a main water supply pipe, a main water return pipe and a plurality of branch pipes connected between the main water supply pipe and the main water return pipe, the main water supply pipe, the main water return pipe and each branch pipe are respectively provided with a pressure sensor group, each pressure sensor group comprises two pressure sensors which are separated by a preset distance, and the method comprises the following steps:
acquiring pressure sensing signals of each pressure sensor, and judging whether a water supply network has a leakage point or not according to the pressure sensing signals;
if the leakage point exists, acquiring the pressure drop moment when each pressure sensor detects the instantaneous pressure drop;
selecting two pressure sensors as target pressure sensors from all the pressure sensors according to the pressure drop moment, and determining that the position of a leakage point is between the two target pressure sensors;
calculating the propagation speed of the pressure wave in the water according to the distance between two pressure sensors in the water supply main pipe pressure sensor group and the difference of pressure drop moments;
and calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors so as to determine the position of the leak point.
Further, judging whether a leakage point exists in the water supply pipe network according to the pressure sensing signal comprises the following steps:
and if each pressure sensor detects the instantaneous pressure drop and the pressure value detected by each pressure sensor keeps a low-pressure state after the instantaneous pressure drop, judging that the water supply network has a leakage point.
Further, judging whether a leak source exists in the water supply network according to the pressure sensing signal further comprises:
judging whether the interference of load increase and decrease, system pressurization and system decompression measures exists, and if the interference exists, if each pressure sensor detects instantaneous pressure drop, and after the pressure drops instantaneously, the pressure value detected by each pressure sensor keeps a low-pressure state, judging that no leakage point exists in the water supply network;
when interference does not exist, if each pressure sensor detects the instantaneous pressure drop, and after the instantaneous pressure drop, the pressure value detected by each pressure sensor keeps a low-pressure state, and the existence of a leakage point in the water supply network is judged.
Further, a pressure difference sensor is further arranged between the water supply main pipe and the water return main pipe, a plate converter electric valve is arranged on each branch pipe, and whether the interference of load increase and decrease, system pressurization or system pressure reduction measures exists or not is judged as follows:
judging whether the differential pressure value detected by the differential pressure sensor is within a preset reasonable differential pressure value range when each pressure sensor detects the instantaneous pressure drop;
judging whether the opening and closing states of the electric valves of the plate converters are changed when the pressure sensors detect the instantaneous pressure drop;
and if the pressure difference value is not within the preset reasonable pressure difference value range, or the switching state of at least one plate converter electric valve is changed, judging that interference exists, otherwise, judging that the interference does not exist.
Further, selecting two pressure sensors as the target pressure sensor from all the pressure sensors according to the pressure drop timing includes: according to the pressure drop time, two pressure sensors which detect the pressure drop instantly at first are taken as target pressure sensors.
Further, acquiring the pressure sensing signal of each pressure sensor is: and sampling according to a preset sampling period to obtain pressure sensing signals of each pressure sensor, wherein the preset distance is greater than the product of the propagation speed of the pressure wave in the water and the preset sampling period.
Further, according to the propagation velocity of the pressure wave in the water and the distance between the two target pressure sensors, calculating the distances between the leak point and the two target pressure sensors respectively includes:
according to the formula
x1+x2＝L 1-2, ，|t1-t2|＝Δt 1-2 Obtaining a distance x1 between the leak point and a first target pressure sensor located upstream of the leak point, and a distance x2 between the leak point and a second target pressure sensor located downstream of the leak point;
wherein L is 1-2 The distance between the first target pressure sensor and the second target sensor, v is the propagation velocity of the pressure wave in the water, t1 is the pressure drop time of the first target pressure sensor, and t2 is the pressure drop time of the second target pressure sensor.
The invention also provides a water supply network leakage point detection system, which is used for detecting the leakage points of the water supply network, wherein the water supply network comprises a main water supply pipe, a main water return pipe and a plurality of branch pipes connected between the main water supply pipe and the main water return pipe, the main water supply pipe, the main water return pipe and each branch pipe are respectively provided with a pressure sensor group, each pressure sensor group comprises two pressure sensors with preset distance at intervals, and the system comprises a sampling module, a leakage point existence judgment module, a target pressure sensor determination module and a leakage point position determination module, wherein:
the sampling module is connected with the leak source existence judging module and is used for acquiring pressure sensing signals of all the pressure sensors;
the leakage point existence judging module is connected with the target pressure sensor determining module and used for judging whether a water supply network has a leakage point or not according to the pressure sensing signal;
the target pressure sensor determining module is connected with the leakage point position determining module and used for acquiring the pressure drop moment when each pressure sensor detects the instantaneous pressure drop when a leakage point exists; selecting two pressure sensors as target pressure sensors from all the pressure sensors according to the pressure drop moment, and determining that the position of a leakage point is between the two target pressure sensors;
the leakage point position determining module is used for calculating the propagation speed of the pressure wave in the water according to the distance between two pressure sensors in the water supply main pipe pressure sensor group and the difference of pressure drop moments; and calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors so as to determine the position of the leak point.
Further, the step of calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors by the leak point position determining module includes:
according to the formula
x1+x2＝L 1-2, ，|t1-t2|＝Δt 1-2 Obtaining a leak point and a first target pressure upstream of the leak pointDistance x1 of the sensor, distance x2 from a second target pressure sensor located downstream of the leak point;
wherein L is 1-2 The distance between the first target pressure sensor and the second target sensor, v is the propagation velocity of the pressure wave in the water, t1 is the pressure drop time of the first target pressure sensor, and t2 is the pressure drop time of the second target pressure sensor.
The invention also provides a water supply network leakage point detection device, which is used for detecting the leakage point of the water supply network, wherein the water supply network comprises a main water supply pipe, a main water return pipe and a plurality of branch pipes connected between the main water supply pipe and the main water return pipe;
a pressure sensor group is arranged on each branch pipe;
and the computer determines the position of the leakage point according to the water supply pipe network leakage point detection method.
The method, the system and the device for detecting the leakage points of the water supply pipe network, provided by the invention, at least have the following beneficial effects:
(1) the pressure sensor groups are arranged on the water supply main pipe, the water return main pipe and each branch pipe in advance, whether leakage points exist can be automatically judged subsequently according to pressure sensing signals detected by the pressure sensor groups, and after the leakage points are preliminarily positioned, specific positions where the leakage points are located are further calculated, so that the detection precision of the leakage points is improved.
(2) Whole leak source testing process need not artifical the participation, does not have the requirement to check out time, testing environment, and only needs the propagation velocity of pressure wave in aqueous and the distance between two target pressure sensor can calculate the concrete position that obtains the leak source, and the computational process is simple, can improve leak source detection efficiency.
(3) When judging whether the water supply network has the leakage point, the interference of measures of load increase and decrease, system pressurization and system decompression is eliminated, and the accuracy of the leakage point judgment is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a water supply network and a water supply network leak detection device according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting leak points in a water supply network according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for determining whether a missing dot exists according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for determining whether interference exists according to an embodiment of the present invention;
FIG. 5 is a schematic view of a leak detection system for a water supply network in accordance with an embodiment of the present invention;
the system comprises a water pump 1, a water supply main pipe 2, a water supply main pipe 3, a first water supply branch pipe 4, a first plate changer, a second water supply branch pipe 5, a second plate changer 6, a third water supply branch pipe 7, a third plate changer 8, a water return main pipe 9, a first pressure sensor 10, a second pressure sensor 11, a third pressure sensor 12, a fourth pressure sensor 13, a fifth pressure sensor 14, a sixth pressure sensor 15, a seventh pressure sensor 16, an eighth pressure sensor 17, a ninth pressure sensor 18, a tenth pressure sensor 19 and a computer 20.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment of the present invention, a method for detecting water supply network leak points is provided.
As shown in fig. 1, a water supply network is shown, which includes a water pump 1, a main water supply pipe 2, a main water return pipe 9, and a plurality of branch pipes (only 3 branch pipes are illustrated in fig. 1, and the branch pipes are a first branch pipe 3, a second branch pipe 5, and a third branch pipe 7, respectively) connected between the main water supply pipe 2 and the main water return pipe 9. The water supply main pipe 2, the water return main pipe 9 and each branch pipe are respectively provided with a pressure sensor group, each pressure sensor group comprises two pressure sensors which are separated by a preset distance, the preset distance is preset by a technician, and the specific setting of the preset distance is not limited. Furthermore, the pressure sensor group on the main water supply pipe is arranged at the starting end of the main water supply pipe, the pressure sensor group on the main water return pipe is arranged at the tail end of the main water return pipe (namely, at a position close to the water pump), the pressure sensor group on each branch pipe is arranged at the tail end of each branch pipe, namely, at one end close to the user side, and through the arrangement, the power supply of each pressure sensor group is guaranteed.
Specifically, in fig. 1, a first pressure sensor 10 and a second pressure sensor 11 are mounted on the main water supply pipe 2, a third pressure sensor 12 and a fourth pressure sensor 13 are mounted on the first branch pipe 3, a fifth pressure sensor 14 and a sixth pressure sensor 15 are mounted on the second branch pipe 5, a seventh pressure sensor 16 and an eighth pressure sensor 17 are mounted on the third branch pipe 7, and a ninth pressure sensor 18 and a tenth pressure sensor 19 are mounted on the main return water pipe 9. Wherein, each pressure sensor group is used for detecting the pressure value of the main water supply pipe 2, the main water return pipe 9 and each branch pipe, and transmitting the detected data (referring to the pressure sensing signal mentioned in the present invention) to the computer 20.
The computer 20 stores the distance between two adjacent pressure sensors (for example, in fig. 1, the distance between the first pressure sensor 10 and the second pressure sensor 11, the distance between the third pressure sensor 12 and the fourth pressure sensor 13, the distance between the fifth pressure sensor 14 and the sixth pressure sensor 15, the distance between the seventh pressure sensor 16 and the eighth pressure sensor 17, the distance between the ninth pressure sensor 18 and the tenth pressure sensor 19, the distance between the second pressure sensor 11 and the third pressure sensor 12, the distance between the second pressure sensor 11 and the fifth pressure sensor 14, the distance between the second pressure sensor 11 and the seventh pressure sensor 16, the distance between the fourth pressure sensor 13 and the tenth pressure sensor 19, the distance between the sixth pressure sensor 15 and the tenth pressure sensor 19, and the distance between the eighth pressure sensor 17 and the tenth pressure sensor 19) in advance), and the computer subsequently detects the data according to the pressure sensor group and the stored distance between two adjacent pressure sensors And determining the specific position of the leakage point. Namely, the execution subject of the method is a computer.
As shown in fig. 2, the method comprises the steps of:
step S101: and acquiring pressure sensing signals of the pressure sensors.
In this step, each pressure sensor can detect the pressure value of the water supply network in real time, and then the computer samples the pressure sensing signal (i.e. the detected pressure value) of each pressure sensor according to the preset sampling period (or the preset sampling frequency). Specifically, the sampling period (or sampling frequency) is preset by a technician, the specific value of the sampling period (or sampling frequency) is not limited in the present invention, and it should be understood that the higher the sampling frequency is, the higher the detection accuracy is, and the technician can set the sampling frequency according to the requirement of the detection accuracy.
Further, the preset sampling period and the preset distance between two pressure sensors in the same pressure sensor group should satisfy the following conditions: the preset distance is greater than the product of the propagation speed of the pressure wave in the water and the preset sampling period, and the propagation speed of the pressure wave in the water can be calculated conveniently.
Step S102: and judging whether a leakage point exists in the water supply network according to the pressure sensing signal, if so, executing the step S103, otherwise, continuing to execute the step S102.
Step S103: and acquiring the pressure drop moment when each pressure sensor detects the instantaneous pressure drop.
Specifically, the pressure sensor uploads the pressure sensing signal to the computer in real time after detecting the pressure sensing signal, and the computer records the time of receiving the pressure sensing signal, so that the pressure drop moment when each pressure sensor detects the instantaneous pressure drop can be obtained in the step.
In the present invention, the instant of pressure drop refers to the moment when the pressure sensor detects a sudden drop in pressure value. If a leak point exists in the water supply network, the pressure in the water pipe will drop, and the pressure drop will be detected earlier at positions closer to the leak point. That is, it should be understood that the pressure drop at the instant of the pressure drop detected by the pressure sensor at different locations is different in time.
Step S104: and selecting two pressure sensors from all the pressure sensors according to the pressure drop moment as target pressure sensors, and determining that the position of the leakage point is between the two target pressure sensors.
Specifically, the step is to perform preliminary positioning on the position of the missing point.
Since the closer to the leak point, the earlier the pressure drop is detected, in this step, two pressure sensors are selected as the target pressure sensor from all the pressure sensors according to the pressure drop time: and according to the pressure drop time, taking the two pressure sensors which detect the instantaneous pressure drop as target pressure sensors, determining that the position of the leakage point is between the two target pressure sensors, and then calculating according to the step S105 and the step S106 to obtain the accurate position of the leakage point.
Step S105: and calculating the propagation speed of the pressure wave in the water according to the distance between two pressure sensors in the water supply main pipe pressure sensor group and the difference of pressure drop moments.
Specifically, the distance between two pressure sensors in the pressure sensor group installed in the main water supply pipe is stored in the computer in advance, and taking the distance as S as an example, if the pressure drop times of the two pressure sensors in the pressure sensor group of the main water supply pipe are t3 and t4 respectively, the difference between the pressure drop times of the two pressure sensors is calculated to be | t3-t4|, and the propagation velocity v of the pressure wave in the water is | S t3-t4 |.
Step S106: and calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors so as to determine the position of the leak point.
Specifically, in this step, calculating the distances between the leak point and the two target pressure sensors respectively according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors includes:
according to the formula
x1+x2＝L 1-2, ，|t1-t2|＝Δt 1-2 Obtaining a distance x1 from the leak point to a first target pressure sensor located upstream of the leak point, and a distance x2 from a second target pressure sensor located downstream of the leak point; specifically, the direction of the water supply main pipe network is the upstream direction, and the direction of the water return main pipe network is the downstream direction.
Wherein L is 1-2 The distance between the first target pressure sensor and the second target sensor, v is the propagation velocity of the pressure wave in the water, t1 is the pressure drop time of the first target pressure sensor, and t2 is the pressure drop time of the second target pressure sensor.
According to the water supply pipe network leakage point detection method provided by the invention, the pressure sensor groups are respectively arranged on the water supply main pipe, the water return main pipe and each branch pipe in advance, whether leakage points exist can be automatically judged subsequently according to pressure sensing signals detected by the pressure sensor groups, and after the leakage points are preliminarily positioned, the specific positions of the leakage points are further calculated, so that the leakage point detection precision is improved. And whole leak source testing process need not artifical the participation, does not have the requirement to check-out time, detection ring border, and only need utilize the propagation velocity of pressure wave in aqueous and the distance between two target pressure sensor can calculate the concrete position that obtains the leak source, and the computational process is simple, can improve leak source detection efficiency.
In one embodiment of the present invention, the determining whether there is a leak in the water supply network according to the pressure sensing signal in step S102 includes:
and if the pressure sensors respectively detect the pressure instant drop, and after the pressure instant drop, the pressure values detected by the pressure sensors keep a low-pressure state, and then the existence of leakage points in the water supply network is judged.
In this embodiment, when judging whether the water supply network has the leak source, only every pressure sensor all detected the pressure instantaneous drop, and after the pressure instantaneous drop, the pressure value that each pressure sensor detected keeps the low pressure state, just judges that the water supply network has the leak source to can get rid of because of the influence of the circumstances such as certain pressure sensor trouble, avoid appearing the erroneous judgement, improve the accuracy nature that the leak source detected.
In the actual detection process, the computer may be configured to monitor the pressure value detected by each pressure sensor within a preset time period (for example, 5 minutes, 10 minutes, and the like, where specific values may be set by a technician) after each pressure sensor detects the instantaneous drop of the pressure, and determine whether the pressure value detected by each pressure sensor is in a low-pressure state within the preset time period. The preset low-pressure threshold corresponding to the low-pressure state can be preset, and if the pressure value is smaller than the preset low-pressure threshold, the low-pressure state is considered to be in the low-pressure state.
Further, in another embodiment of the present invention, as shown in fig. 3, the step S102 of determining whether a leak point exists in the water supply network according to the pressure sensing signal further includes:
step S1021: and judging whether the interference of the measures of load increase and decrease, system pressurization and system depressurization exists, if so, executing step S1022, otherwise, executing step S1023.
Step S1022: if each pressure sensor detects the instantaneous pressure drop, and the pressure value detected by each pressure sensor keeps a low-pressure state after the pressure drops instantaneously, judging that no leakage point exists in the water supply network;
step S1023: and if the pressure sensors respectively detect the pressure instant drop, and after the pressure instant drop, the pressure values detected by the pressure sensors keep a low-pressure state, and the existence of leakage points in the water supply network is judged.
Further, as shown in fig. 1, a differential pressure sensor (not shown in the figure) is further disposed between the water supply main pipe 2 and the water return main pipe 9, each of the branch pipes 3, 5, and 7 is respectively provided with a first plate-changing unit 4, a second plate-changing unit 6, and a third plate-changing unit 8, (each branch pipe is provided with a plate-changing unit, fig. 1 only takes 3 branch pipes as an example), wherein, on each branch pipe, a plate-changing unit valve (not shown in the figure) corresponding to the front end (i.e. the upstream position) of each plate-changing unit is disposed. Wherein the differential pressure sensor and the plate converter electric valve at the front end of each plate converter are respectively in communication connection with the computer 20. The computer can detect the pressure difference value between the water supply main pipe 2 and the water return main pipe 9 according to the pressure difference sensor, and the computer can acquire the on-off state of the electric valves of the plate changers on each branch pipe, such as the on-off state of the electric valves of the first plate changer 4, the second plate changer 6 and the third plate changer 8 in fig. 1.
As shown in fig. 4, the determination of whether there is a disturbance in the load increase or decrease, system pressurization, or system depressurization measures includes the steps of:
step S401: judging whether the differential pressure value detected by the differential pressure sensor is within a preset reasonable differential pressure value range when each pressure sensor detects the instantaneous pressure drop;
step S402: judging whether the opening and closing states of the electric valves of the plate converters are changed when the pressure sensors detect the instantaneous pressure drop;
step S403: and if the pressure difference value is not within the preset reasonable pressure difference value range, or the switching state of at least one plate converter electric valve is changed, judging that interference exists, otherwise, judging that the interference does not exist.
Specifically, the preset reasonable differential pressure value range is preset by a technician, and the invention is not limited to this. Whether the system pressurization and decompression conditions exist or not is determined by judging whether the differential pressure value is within a preset reasonable differential pressure value range or not, the interference of the system pressurization and decompression conditions is eliminated, and the interference of load increase and decrease can be eliminated by judging whether the switching state of the electric valve of the plate converter is changed or not. In this embodiment, on the basis of the previous embodiment, when it is determined whether a leak point exists in the water supply network, it is necessary to eliminate the interference of the measures of increasing and decreasing the load, increasing the pressure of the system, and reducing the pressure of the system, so that the interference can be further avoided, and the accuracy of leak point detection can be improved.
The invention also provides a water supply network leakage point detection system for detecting the leakage point of the water supply network, similarly, the water supply network comprises a water supply main pipe, a water return main pipe and a plurality of branch pipes connected between the water supply main pipe and the water return main pipe, the water supply main pipe, the water return main pipe and each branch pipe are respectively provided with a pressure sensor group, and each pressure sensor group comprises two pressure sensors with a preset distance at intervals. The invention is not expanded here.
As shown in fig. 5, the system includes a sampling module 501, a leak existence determining module 502, a target pressure sensor determining module 503, and a leak position determining module 504, wherein:
the sampling module 501 is connected with the leak existence judging module 502 and is used for sampling to obtain pressure sensing signals of each pressure sensor according to a preset sampling period;
a leak point existence judging module 502 connected to the target pressure sensor determining module 503 for judging whether a leak point exists in the water supply network according to the pressure sensing signal;
the target pressure sensor determining module 503 is connected to the leak point position determining module 504, and is configured to, when a leak point exists, obtain a pressure drop time when each pressure sensor detects an instantaneous pressure drop; selecting two pressure sensors as target pressure sensors from all the pressure sensors according to the pressure drop moment, and determining that the position of a leakage point is between the two target pressure sensors;
the leak point position determining module 504 is configured to calculate a propagation speed of the pressure wave in the water according to a distance between two pressure sensors in the water supply main pipe pressure sensor group and a difference between pressure drop moments; and calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors so as to determine the position of the leak point.
In another embodiment of the present invention, the step of calculating the distance between the leak point and each of the two target pressure sensors by the leak point position determination module 504 according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors includes:
according to the formula
x1+x2＝L 1-2, ，|t1-t2|＝Δt 1-2 Obtaining a distance x1 from the leak point to a first target pressure sensor located upstream of the leak point, and a distance x2 from a second target pressure sensor located downstream of the leak point; wherein the direction of the water supply main pipe network is the upstream direction, and the direction of the water return main pipe network is the downstream direction.
Wherein L is 1-2 The distance between the first target pressure sensor and the second target sensor, v is the propagation velocity of the pressure wave in the water, t1 is the pressure drop time of the first target pressure sensor, and t2 is the pressure drop time of the second target pressure sensor.
In another embodiment of the present invention, the present invention further provides a water supply network leakage point detection device for detecting leakage points of a water supply network, the water supply network includes a main water supply pipe, a main water return pipe and a plurality of branch pipes connected between the main water supply pipe and the main water return pipe, the device includes a computer and a plurality of pressure sensor groups in communication connection with the computer, each pressure sensor group includes two pressure sensors spaced by a preset distance;
a pressure sensor group is arranged on each branch pipe; and the computer determines the position of the leakage point according to the water supply pipe network leakage point detection method.
According to the method, the system and the device for detecting the leakage point of the water supply pipe network, provided by the invention, the pressure sensor groups are arranged on the main water supply pipe, the main water return pipe and each branch pipe in advance respectively, whether the leakage point exists can be automatically judged subsequently according to the pressure sensing signals detected by each pressure sensor group, and after the leakage point is preliminarily positioned, the specific position of the leakage point is further calculated, so that the detection precision of the leakage point is improved. Whole leak source testing process need not artifical the participation, does not have the requirement to check out time, detection ring border, and only need utilize the propagation velocity of pressure wave in aqueous and the distance between two target pressure sensor can calculate the concrete position that obtains the leak source, and the computational process is simple, can improve leak source detection efficiency.
It will be appreciated by those skilled in the art that changes could be made to the details of the above-described embodiments without departing from the underlying principles thereof. The scope of the invention is, therefore, indicated by the appended claims, in which all terms are intended to be interpreted in their broadest reasonable sense unless otherwise indicated.
Claims (10)
1. The utility model provides a water supply network leak source detection method for detect the water supply network leak source, its characterized in that, the water supply network includes that the water supply is responsible for, the return water is responsible for and connects a plurality of bleeder pipes between the water supply is responsible for and the return water is responsible for, the water supply is responsible for, the return water is responsible for and every bleeder pipe on all is equipped with a pressure sensor group, every pressure sensor group includes two pressure sensors of interval preset distance, the method includes:
acquiring pressure sensing signals of each pressure sensor, and judging whether a leakage point exists in the water supply network or not according to the pressure sensing signals;
if the leakage point exists, acquiring the pressure drop moment when each pressure sensor detects the instantaneous pressure drop;
selecting two pressure sensors from all pressure sensors according to the pressure drop moment as target pressure sensors, and determining that the position of the leakage point is between the two target pressure sensors;
calculating the propagation speed of the pressure wave in the water according to the distance between two pressure sensors in the water supply main pipe pressure sensor group and the difference between pressure drop moments;
and calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors so as to determine the position of the leak point.
2. The method of claim 1, wherein said determining if a leak exists in the water supply network based on the pressure sensing signal comprises:
and if the pressure sensors respectively detect the pressure instant drop, and after the pressure instant drop, the pressure values detected by the pressure sensors keep a low-pressure state, and then the existence of leakage points in the water supply network is judged.
3. The method of claim 1, wherein said determining if a leak exists in said water supply network based on said pressure sensing signal further comprises:
judging whether the interference of load increase and decrease, system pressurization and system decompression measures exists, and judging that no leakage point exists in the water supply network if each pressure sensor detects the instantaneous pressure drop and the pressure value detected by each pressure sensor keeps a low-pressure state after the instantaneous pressure drop when the interference exists;
when no interference exists, if each pressure sensor detects the instantaneous pressure drop, and after the instantaneous pressure drop, the pressure value detected by each pressure sensor keeps a low-pressure state, and the existence of a leakage point in the water supply network is judged.
4. The method for detecting the leakage point of the water supply pipe network according to claim 3, wherein a differential pressure sensor is further arranged between the main water supply pipe and the main water return pipe, each branch pipe is provided with a plate-exchanger electric valve, and the step of judging whether the interference of the measures of load increase and decrease, system pressurization or system depressurization exists is as follows:
judging whether the differential pressure value detected by the differential pressure sensor is within a preset reasonable differential pressure value range when each pressure sensor detects the instantaneous pressure drop;
judging whether the opening and closing states of the electric valves of the plate converters are changed when the pressure sensors detect the instantaneous pressure drop;
and if the pressure difference value is not within the preset reasonable pressure difference value range, or the switching state of at least one plate converter electric valve is changed, judging that interference exists, or judging that interference does not exist.
5. The method of claim 1, wherein said selecting two pressure sensors as target pressure sensors from all pressure sensors based on said pressure drop time comprises: and according to the pressure drop time, taking two pressure sensors which detect the pressure drop instantly at first as target pressure sensors.
6. The method for detecting leak points in a water supply network according to claim 1, wherein the obtaining of the pressure sensing signals of each pressure sensor comprises: and sampling according to a preset sampling period to obtain pressure sensing signals of each pressure sensor, wherein the preset distance is greater than the product of the propagation speed of the pressure wave in water and the preset sampling period.
7. The method of claim 1, wherein calculating the respective distances between the leak point and the two target pressure sensors according to the propagation velocity of the pressure wave in the water and the distance between the two target pressure sensors comprises:
according to the formula
x1+x2＝L 1-2, ，|t1-t2|＝Δt 1-2 Obtaining a distance x1 from the leak point to a first target pressure sensor located upstream of the leak point, and a distance x2 from a second target pressure sensor located downstream of the leak point;
wherein L is 1-2 Is the distance between the first target pressure sensor and the second target sensor, v is the propagation of the pressure wave in the waterVelocity, t1, is the time of the pressure drop of the first target pressure sensor, and t2 is the time of the pressure drop of the second target pressure sensor.
8. The utility model provides a water supply pipe network leak source detecting system for detect the water supply pipe network leak source, its characterized in that, the water supply pipe network is responsible for including supplying water, the return water and is connected a plurality of bleeder pipes between the person in charge of and the return water are responsible for supplying water, the water supply is responsible for, the return water is responsible for and all is equipped with a pressure sensor group on every bleeder pipe, and every pressure sensor group includes the pressure sensor of two intervals default distance, the system includes that sampling module, leak source exist judging module, target pressure sensor confirm module and leak source position confirm module, wherein:
the sampling module is connected with the leak point existence judging module and is used for acquiring pressure sensing signals of all the pressure sensors;
the leakage point existence judging module is connected with the target pressure sensor determining module and used for judging whether a leakage point exists in the water supply pipe network or not according to the pressure sensing signal;
the target pressure sensor determining module is connected with the leak point position determining module and is used for acquiring the pressure drop moment when each pressure sensor detects the instantaneous pressure drop when a leak point exists; selecting two pressure sensors from all pressure sensors according to the pressure drop moment as target pressure sensors, and determining that the position of the leakage point is between the two target pressure sensors;
the leakage point position determining module is used for calculating the propagation speed of the pressure wave in the water according to the distance between two pressure sensors in the water supply main pipe pressure sensor group and the difference between pressure drop moments; and calculating the distances between the leak point and the two target pressure sensors according to the propagation speed of the pressure wave in the water and the distance between the two target pressure sensors so as to determine the position of the leak point.
9. The system of claim 8, wherein the leak location determining module calculates the respective distances between the leak and the two target pressure sensors based on the propagation velocity of the pressure wave in the water and the distance between the two target pressure sensors comprises:
according to the formula
x1+x2＝L 1-2, ，|t1-t2|＝Δt 1-2 Obtaining a distance x1 from the leak point to a first target pressure sensor located upstream of the leak point, and a distance x2 from a second target pressure sensor located downstream of the leak point;
wherein L is 1-2 The distance between the first target pressure sensor and the second target sensor, v is the propagation velocity of the pressure wave in the water, t1 is the pressure drop time of the first target pressure sensor, and t2 is the pressure drop time of the second target pressure sensor.
10. A water supply network leakage point detection device is used for detecting leakage points of a water supply network and is characterized in that the water supply network comprises a main water supply pipe, a main water return pipe and a plurality of branch pipes connected between the main water supply pipe and the main water return pipe, the device comprises a computer and a plurality of pressure sensor groups in communication connection with the computer, and each pressure sensor group comprises two pressure sensors with a preset distance at intervals;
the water supply main pipe, the water return main pipe and each branch pipe are respectively provided with a pressure sensor group;
the computer determines the location of a leak in a water supply network according to the method of any one of claims 1 to 7.
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| CN116557792B (en) * | 2023-07-07 | 2023-10-10 | 杭州智缤科技有限公司 | Low-cost water supply network pipe explosion detection method, device and application |
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