A system suitable for thermal pipeline leakage detection and leakage point precise positioning

Abstract

The present invention provides a system suitable for thermal pipeline leakage detection and accurate positioning of leakage points. A sound wave transmitter is arranged near the first station of the thermal pipeline, and the sound wave transmitter is connected to the first host. A sound wave receiver is arranged near the last station of the thermal pipeline, and the sound wave receiver is connected to the second host. The inner layer of the thermal pipeline is used for the transportation of high-temperature liquid, and a cavity is formed between the outer layer and the inner layer. The sound wave transmitter and the sound wave receiver are installed at the head end and the end of the cavity. The first host and the second host both have a singular point extraction unit based on the local modulus maximum to extract the abnormal point of sound wave propagation inside the cavity. The first host and the second host exchange information, wherein the second host extracts the abnormal point of sound wave propagation through the singular point extraction unit and gives the first host a transmission signal and a timing signal. After the first host extracts the abnormal point of sound wave propagation through the singular point extraction unit, its processing unit performs accurate positioning calculation on the leakage point. The present invention realizes accurate leakage detection of pipelines.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline detection, and in particular to a system suitable for thermal pipeline leakage detection and leakage point precise positioning. Background Art

[0002] The heat supply network is also called heat supply pipeline, which starts from the boiler room, direct-fired machine room, heating center, etc., and leads from the heat source to the heat supply entrance of the building. Multiple heat supply pipelines form a network. The design pressure of the hot water medium for heating is less than or equal to 2.5MPa, and the design temperature is less than or equal to 200℃; the design pressure of the steam medium for heating is less than or equal to 1.6MPa, and the design temperature is less than or equal to 350℃.

[0003] Thermal pipelines may leak during transportation. Currently, the main methods for monitoring fluid leakage in pipelines include: pressure point analysis method, negative pressure wave method, flow difference monitoring method, optical cable monitoring method, etc. These methods have the possibility of false alarms and cannot meet the needs. Summary of the invention

[0004] The purpose of the present invention is to provide a system suitable for thermal pipeline leakage detection and leakage point precise positioning to solve the above problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a system suitable for thermal pipeline leakage detection and precise positioning of leakage points, including a first station, a thermal pipeline, and a terminal station, wherein the thermal pipeline is provided with a sound wave transmitter near the first station, and the sound wave transmitter is connected to a first host, and the thermal pipeline is provided with a sound wave receiver near the terminal station, and the sound wave receiver is connected to a second host, and the thermal pipeline includes an inner layer and an outer layer, the inner layer is used for the transportation of high-temperature liquid, and the outer layer is coated on the outer side of the inner layer and a closed cavity is formed between the two, wherein the sound wave transmitter and the sound wave receiver are installed in the cavity The first host and the second host both have a singular point extraction unit based on the local modulus maximum to extract the abnormal point of sound wave propagation inside the cavity. The first host and the second host both include a signal transceiver module to exchange information between the first host and the second host. After the second host extracts the abnormal point of sound wave propagation through the singular point extraction unit, it sends a transmission signal and a timing signal to the first host. After the first host extracts the abnormal point of sound wave propagation through the singular point extraction unit, its processing unit accurately locates and calculates the leakage point, and uses the abnormal value that appears when the sound wave propagates at the abnormal temperature to detect whether a pipeline leakage occurs.

[0006] Preferably, the first host and the second host both include a signal processing module, and the signal processing module includes a filtering and noise reduction module to perform noise processing on time-frequency domain signals.

[0007] Preferably, the method for precise positioning calculation is as follows: the first host obtains the transmission wave speed n of the sound wave transmitter, and the timing signal obtains the time period T from the sound wave transmitter transmitting the sound wave to the receiving singular point, and the distance between the sound wave transmitter and the singular point can be obtained by multiplying the wave speed n by the time period T, thereby realizing precise positioning of the leakage point.

[0008] Preferably, the first host and the second host are both electrically connected to an alarm, and the alarm sounds an alarm when the first host and the second host receive a singular point.

[0009] Preferably, the inner layer and the outer layer of the thermal pipeline are both made of thermal insulation materials.

[0010] The present invention provides a system suitable for thermal pipeline leakage detection and leakage point precise positioning. It has the following beneficial effects:

[0011] The present invention provides a system suitable for thermal pipeline leakage detection and precise leakage point positioning, which uses abnormal values ​​that appear when sound waves propagate at abnormal temperatures to detect whether pipeline leakage occurs. The first host and the second host both extract abnormal points of sound wave propagation inside the cavity through a singular point extraction unit and then issue an alarm. The dual-machine joint inspection avoids false alarms. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic diagram of a system structure suitable for thermal pipeline leakage detection and leakage point precise positioning.

[0013] In the figure: 1. thermal pipe; 2. sound wave transmitter; 3. sound wave receiver; 4. first host; 5. second host. DETAILED DESCRIPTION

[0014] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0015] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top end", "bottom end", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] like Figure 1As shown, a system suitable for thermal pipeline leakage detection and precise positioning of leakage points includes a head station, a thermal pipeline 1, and a terminal station, wherein the thermal pipeline 1 is provided with a sound wave transmitter 2 near the head station, and the sound wave transmitter 2 is connected to a first host 4, and the thermal pipeline 1 is provided with a sound wave receiver 3 near the terminal station, and the sound wave receiver 3 is connected to a second host 5. The thermal pipeline 1 includes an inner layer and an outer layer, the inner layer is used for conveying high-temperature liquid, and the outer layer is coated on the outer side of the inner layer and a closed cavity is formed between the two, wherein the sound wave transmitter 2 and the sound wave receiver 3 are installed at the head end and the end of the cavity, and during detection, the first host 4 controls the sound wave transmitter 2 to emit sound waves, and the sound wave receiver 3 receives sound waves, and the first host 4 and the second host 5 extract abnormal points of sound wave propagation inside the cavity based on a singular point extraction unit of a local modulus maximum value, and during the extraction process, the filtering noise reduction module of the signal processing module of the first host and the second host performs noise processing on the time-frequency domain signal, and the first host 4 and the second host 5 exchange information between the first host 4 and the second host 5 through a signal transceiver module, wherein the second host 5 uses a singular point extraction unit to extract the abnormal points of sound wave propagation inside the cavity, and ... After the point extraction unit extracts the abnormal point of sound wave propagation, it gives the first host 4 a transmission signal and a timing signal. (When the sound wave is emitted for the first time here, the first host 4 does not directly activate the alarm when it directly receives the abnormal point of sound wave propagation in order to reuse the second host 5 to feedback to the first host so that the sound wave transmitter 2 emits the sound wave again and the first host verifies again whether the abnormal point of sound wave propagation exists to avoid false alarms. At the same time, the first host 4 and the second host 5 both need to detect the existence of the abnormal point of sound wave propagation to complete the above transmission control to avoid false alarms from a single host. The first host and the second host are electrically connected to the alarm. When the first host and the second host receive the singular point, the alarm sounds an alarm. Alarms are set at both ends for alarm leakage management, and the two are turned on and off at the same time). The timing signal is to start the timing module for timing, specifically the time period from emitting the sound wave to detecting the singular point. After the first host 4 extracts the abnormal point of sound wave propagation through the singular point extraction unit, its processing unit accurately locates and calculates the leakage point, and uses the abnormal value that appears when the sound wave propagates at the abnormal temperature to detect whether a pipeline leakage occurs.

[0017] The method for precise positioning calculation is as follows: the first host obtains the transmission wave speed n of the sound wave transmitter, and the timing signal obtains the time period T from the sound wave transmitter to the receiving singular point. By multiplying the wave speed n by the time period T, the distance between the sound wave transmitter and the singular point can be obtained, thereby realizing the precise positioning of the leakage point.

[0018] A system suitable for thermal pipeline leakage detection and precise positioning of leakage points in the present invention can be used for leakage detection and positioning of a segment on a thermal pipeline. The detection of leakage in a long-distance thermal pipeline can be equipped with multiple systems arranged along the thermal pipeline. Each system is independently installed in an independent cavity, and each cavity is shielded from each other.

[0019] In summary, the present invention provides a system suitable for thermal pipeline leakage detection and precise positioning of leakage points, which uses abnormal values ​​that appear when sound waves propagate at abnormal temperatures to detect whether a pipeline leak occurs. The first host and the second host both issue an alarm when they extract abnormal points of sound wave propagation inside the cavity through a singular point extraction unit, and the two machines conduct joint inspection to avoid false alarms.

[0020] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system suitable for thermal pipeline leakage detection and leakage point accurate positioning, characterized in that: The invention comprises a first station, a thermal pipeline and a terminal station, wherein a sound wave transmitter is arranged near the first station of the thermal pipeline, and the sound wave transmitter is connected to a first host, and a sound wave receiver is arranged near the terminal station of the thermal pipeline, and the sound wave receiver is connected to a second host, and the thermal pipeline comprises an inner layer and an outer layer, wherein the inner layer is used for conveying high-temperature liquid, and the outer layer is coated on the outer side of the inner layer and a closed cavity is formed between the two, wherein the sound wave transmitter and the sound wave receiver are installed at the head end and the end of the cavity, and the first host and the second host both have a singular point extraction unit based on a local modulus maximum value to extract the abnormal point of sound wave propagation inside the cavity, and the first host and the second host both include a signal transceiver module to exchange information between the first host and the second host, wherein the second host sends a transmission signal and a timing signal to the first host after extracting the abnormal point of sound wave propagation through the singular point extraction unit, and the first host extracts the abnormal point of sound wave propagation through the singular point extraction unit, and its processing unit performs precise positioning calculation on the leakage point, and uses the abnormal value appearing when the sound wave propagates at the abnormal temperature to detect whether the pipeline leaks.

2. A system suitable for thermal pipeline leakage detection and leakage point precise positioning according to claim 1, characterized in that: The first host and the second host both include a signal processing module, and the signal processing module includes a filtering and noise reduction module to perform noise processing on time-frequency domain signals.

3. A system suitable for thermal pipeline leakage detection and leakage point precise positioning according to claim 1, characterized in that: The method for precise positioning calculation is as follows: the first host obtains the transmission wave speed n of the sound wave transmitter, and the timing signal obtains the time period T from the sound wave transmitter transmitting the sound wave to the receiving singular point. The distance between the sound wave transmitter and the singular point can be obtained by multiplying the wave speed n by the time period T, thereby realizing precise positioning of the leakage point.

4. A system suitable for thermal pipeline leakage detection and leakage point precise positioning according to claim 1, characterized in that: The first host and the second host are both electrically connected to an alarm, and the alarm sounds an alarm when the first host and the second host receive a singular point.

5. The system for thermal pipeline leakage detection and leakage point accurate positioning according to claim 1 is characterized by: The inner layer and the outer layer of the thermal pipeline are both made of heat insulation materials.

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