CN117553247A - System and method for testing micro leakage of pipeline liquid medium based on sound waves - Google Patents
System and method for testing micro leakage of pipeline liquid medium based on sound waves Download PDFInfo
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- CN117553247A CN117553247A CN202311520748.XA CN202311520748A CN117553247A CN 117553247 A CN117553247 A CN 117553247A CN 202311520748 A CN202311520748 A CN 202311520748A CN 117553247 A CN117553247 A CN 117553247A
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- 239000007788 liquid Substances 0.000 title claims abstract description 69
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title abstract description 14
- 238000004088 simulation Methods 0.000 claims abstract description 62
- 230000026683 transduction Effects 0.000 claims abstract description 23
- 238000010361 transduction Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000005236 sound signal Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 21
- 230000001502 supplementing effect Effects 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
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- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002637 fluid replacement therapy Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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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
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- Acoustics & Sound (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a system and a method for testing micro leakage of a pipeline liquid medium based on sound waves, wherein the system comprises a simulation pipeline and a water sound transduction device which is installed in the simulation pipeline in a lifting manner through a lifting piece; the inlet end of the simulation pipeline is connected with the pressure supply device, and the outlet end of the simulation pipeline is connected with the ball valve; two sides of the analog pipeline, which correspond to the underwater acoustic transduction device, are respectively provided with an analog leakage hole, and each analog leakage hole is provided with a needle valve for controlling the leakage size and a flowmeter for detecting the leakage quantity; the underwater acoustic transducer is connected with the signal acquisition device through a signal wire, and the signal acquisition device is used for receiving, storing and analyzing the signals acquired by the underwater acoustic transducer. The invention can realize collection, storage and analysis of leakage sound signals, can provide high-pressure flowing state and high-pressure non-flowing state, realizes detection of different leakage quantities by adjusting the opening degree of the needle valve, the opening sequence and the flow values before and after observation, and has the advantages of safety, reliability, convenient disassembly and convenient adjustment.
Description
Technical Field
The invention relates to the technical field of pipeline leakage acoustic wave detection, in particular to a pipeline liquid medium micro-leakage testing system and method based on acoustic waves.
Background
The pipeline is used as a main transportation mode and makes great contribution to the development of national economy. However, as the service life increases, the pipeline is easy to corrode and age or illegally damage, and serious economic loss and environmental pollution are caused. Therefore, leak testing of in-service pipelines is becoming a major issue. However, the current pipeline detection technology has mature detection methods aiming at large pipe diameter and large leakage, for example: optical fiber method, pipeline pig, negative pressure wave method, pressure gradient method, and mass balance method. However, if the pipeline pigs are affected by too small pipe diameter, the mass balance method, the negative pressure wave generation method and the pressure gradient method are insensitive to tiny leakage, and the optical fiber method needs to be paved along the pipe, so that a system and a method for testing the tiny leakage of the liquid medium of the pipeline based on sound waves are urgently needed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a system and a method for testing the micro leakage of a pipeline liquid medium based on sound waves, which can realize the collection, storage and analysis of leakage sound signals, can realize the detection of different leakage amounts, the detection of high-pressure flow and high-pressure non-flow and the simulation of different leakage points, and has the advantages of safety, reliability, convenient disassembly, simple structure and convenient adjustment, and meets the requirements of engineering detection.
The invention discloses a test system for micro leakage of a pipeline liquid medium based on sound waves, which comprises a simulation pipeline and a water sound transduction device, wherein the water sound transduction device is installed in the simulation pipeline in a lifting manner through a lifting piece;
the inlet end of the simulation pipeline is connected with the pressure supply device, and the outlet end of the simulation pipeline is connected with the ball valve;
two sides of the simulation pipeline, which correspond to the underwater acoustic transduction device, are respectively provided with a simulation leakage hole, and each simulation leakage hole is provided with a needle valve for controlling the leakage size and a flowmeter for detecting the leakage quantity;
the underwater acoustic transducer is connected with the signal acquisition device through a signal wire, and the signal acquisition device is used for receiving, storing and analyzing the signals acquired by the underwater acoustic transducer.
As a further improvement of the invention, the lifting piece comprises an outer fastening nut, a special gasket, an inner rubber gasket and an inner fastening T-shaped nut;
the underwater acoustic transducer is a hydrophone, a probe part of the hydrophone is arranged in the analog pipeline, and a stud part of the underwater acoustic transducer sequentially penetrates through the inner fastening T-shaped nut, the inner rubber gasket, the side wall of the analog pipeline and the special gasket and then is connected with the outer fastening nut.
As a further improvement of the invention, the bottom of the special gasket is of a cambered surface structure which is jointed with the outer edge surface of the simulation pipeline, and the top of the special gasket is of a plane structure which is matched with the external fastening nut;
the top of the internal fastening T-shaped nut is of an arc surface structure matched with the inner edge surface of the simulation pipeline.
As a further improvement of the invention, the pressure supply device comprises a liquid supplementing barrel;
the top of the liquid supplementing barrel is connected with an air compressor through a high-pressure gas pipeline, and a pressure release valve and a high-pressure gas source valve are arranged on the high-pressure gas pipeline;
a liquid level meter for detecting the liquid level in the liquid supplementing barrel is arranged in the liquid supplementing barrel;
the bottom outlet of the liquid supplementing barrel is connected with one end of a pipeline quick connector through a pressure supply pipeline, the other end of the pipeline quick connector is connected with the inlet end of the simulation pipeline, and an outlet valve and a safety valve are sequentially arranged on the pressure supply pipeline.
As a further improvement of the invention, the information acquisition device comprises an industrial computer, a data acquisition card and a data transmission line;
the underwater sound transduction device is connected with the data acquisition card through the data transmission line;
the data acquisition card is connected with the industrial computer through the data transmission line.
As a further improvement of the invention, the analog pipe is also provided with a pressure gauge at a position close to the inlet end, and the pressure gauge is used for detecting the internal pressure of the analog pipe.
As a further improvement of the invention, the device also comprises a turbulence generating device, wherein the turbulence generating device is arranged inside the simulation pipeline and is arranged close to the inlet end of the simulation pipeline;
the turbulence generating device comprises a bracket, a motor and a plurality of blades; the support is arranged in the simulation pipeline and is fixedly connected with the inner wall of the simulation pipeline;
the motor is detachably mounted on the support, the transmission shaft of the motor and the simulation pipeline are coaxially arranged, a plurality of blades are mounted on the transmission shaft, and the blades can rotate around the axis of the simulation pipeline through the transmission shaft.
The invention also discloses a test method of the test system for the micro leakage of the pipeline liquid medium based on the sound wave, which comprises the following steps:
comprising the following steps:
1) Opening the pressure supply device, closing the ball valve, detecting leakage of different opening degrees of one needle valve, recording the numerical value of a flow meter matched with the valve, observing acoustic signals acquired by the underwater acoustic transducer through the information acquisition device, storing and analyzing the acoustic signals, and closing the needle valve after the test is finished;
2) Opening another needle valve, detecting leakage of different opening degrees of the other needle valve, recording the numerical value of a flow meter matched with the other needle valve, observing acoustic signals acquired by a water acoustic transduction device through the information acquisition device, storing and analyzing the acoustic signals, and closing the needle valve after the test is finished;
3) Opening the ball valve, repeating the step 2-3, closing the ball valve after the test is finished, and completing detection of leakage sound signals under high-pressure flow;
4) Adjusting the depth of the underwater sound transduction device in the simulation pipeline, and repeating the steps 2-4 to finish detection of leakage sound signals of different depths of the underwater sound transduction device in the simulation pipeline;
5) And closing the pressure supply device, opening the ball valve, and discharging the residual liquid in the simulation pipeline.
As a further improvement of the present invention, there is also included: the air tightness inspection specifically comprises:
connecting the pressure supply device with the simulation pipeline, and closing the ball valve and the two needle valves;
slowly supplying pressure by using a pressure supply device, and stopping supplying pressure when the pressure value in the analog pipeline reaches a required pressure value;
observing the pressure drop condition of the system and observing whether the acquired acoustic signals are changed or not through an information acquisition device, if not, indicating that the air tightness is good; if there is a change, it is indicated that the air tightness is poor and each connection point of the simulation pipeline needs to be checked.
As a further improvement of the present invention, there is also included: turbulence testing, specifically including:
opening a turbulence generating device arranged in the simulation pipeline;
and (5) repeating the steps 1-5 to finish detection of the leakage sound signals under turbulent flow.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize collection, storage and analysis of leakage sound signals by arranging the underwater acoustic transducer and the signal acquisition device, and has the advantages of safety, reliability, convenient disassembly, simple structure and convenient adjustment by adjusting the opening degree of the needle valve, the switching sequence and the flow values before and after observation under the high-pressure flowing state and the high-pressure non-flowing state which can be provided by controlling the switch of the ball valve by connecting the ball valve at the outlet end of the analog pipeline.
Drawings
FIG. 1 is a schematic diagram of a system for testing micro leakage of a liquid medium in a pipeline based on sound waves according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a leakage principle of a system for testing micro leakage of a liquid medium in a pipeline based on sound waves according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the installation of a lifting member and a hydroacoustic transducer of a sonic-based pipeline liquid medium micro-leakage testing system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a signal acquisition device of a system for testing micro leakage of a liquid medium in a pipeline based on sound waves according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a pressure supply device of a system for testing micro leakage of a liquid medium in a pipeline based on sound waves according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a turbulence generating device of a system for testing micro-leakage of a liquid medium in a pipeline based on sound waves according to an embodiment of the present invention.
In the figure:
1. a pressure supply device; 11. a liquid supplementing barrel; 12. a liquid level gauge; 13. a high pressure gas supply valve; 14. a pressure release valve; 15. an outlet valve; 2. a safety valve; 3. a pipeline quick connector; 4. a pressure gauge; 5. turbulence generating means; 51. a bracket; 52. a motor; 53. a transmission shaft; 54. a blade; 6. a first needle valve; 7. a first flowmeter; 8. an information acquisition device; 81. an industrial computer; 82. a data transmission line; 83. a data acquisition card; 9. a lifting member; 91. internally fastening a T-shaped nut; 92. an inner rubber gasket; 93. a special gasket; 94. an outer fastening nut; 10. a hydroacoustic transducer; 20. a second needle valve; 30. a second flowmeter; 40. simulating a pipeline; 401. simulating a leakage hole; 50. ball valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention is described in further detail below with reference to the attached drawing figures:
1-2, the invention provides a test system for micro leakage of a pipeline liquid medium based on sound waves, which comprises a simulation pipeline 40 and a water sound transduction device 10, wherein the water sound transduction device 10 is installed inside the simulation pipeline 40 in a lifting manner through a lifting piece 9; the inlet end of the simulation pipeline 40 is connected with the pressure supply device 1, and the outlet end of the simulation pipeline 40 is connected with the ball valve 50; two sides of the analog pipeline 40 corresponding to the underwater acoustic transducer 10 are respectively provided with an analog leakage hole 401, and each analog leakage hole 401 is provided with a needle valve for controlling the leakage size and a flowmeter for detecting the leakage quantity; the underwater acoustic transducer 10 is connected with the signal acquisition device 8 through a signal line, and the signal acquisition device 8 is used for converting, processing and analyzing the signals acquired by the underwater acoustic transducer 10.
The invention can realize collection, storage and analysis of leakage sound signals by arranging the underwater acoustic transducer 10 and the signal acquisition device 8, and realizes detection of different leakage quantities by adjusting the opening degree and the opening sequence of the needle valve and observing the flow values before and after the high-pressure flowing state and the high-pressure non-flowing state which can be provided by controlling the opening and the closing of the ball valve 50 by connecting the ball valve 50 at the outlet end of the analog pipeline 40.
Specific:
as shown in FIG. 1, the simulated pipeline 40 in the invention is a national standard oil and gas pipeline with the diameter not smaller than 200 mm.
As shown in fig. 3, the lifting member 9 of the present invention includes an outer fastening nut 94, a special spacer 93, an inner rubber spacer 93, and an inner fastening T-nut 91; the probe part of the underwater sound transducer 10 is arranged in the analog pipeline 40, and the stud part of the underwater sound transducer 10 sequentially passes through the internal fastening T-shaped nut 91, the internal rubber gasket 93, the side wall of the analog pipeline 40 and the special gasket 93 and then is connected with the external fastening nut 94. The underwater acoustic transduction device 10 of the present invention is a hydrophone.
Further, the bottom of the special gasket 93 in the invention is an arc surface structure attached to the outer edge surface of the analog pipeline 40, and the top of the special gasket 93 is a plane structure matched with the outer fastening nut 94; the top of the internally fastened T-nut 91 is a cambered surface structure that mates with the inner edge surface of the simulated pipe 40. The special gasket 93 in the invention is made of rubber stuck on one surface of the same circumference as the pipe diameter after turning. In actual use, the external fastening nut 94 is rotated to drive the internal fastening T-shaped nut 91 to automatically pull to approach the inner edge surface of the simulation pipeline 40, and the special gasket 93 and the internal rubber gasket 93 are extruded and deformed by tightening the pipe wall direction of the simulation pipeline 40 to provide friction force between the underwater sound transducer 10 and the special gasket 93 and the internal rubber gasket 93 and provide tightness. The underwater sound transducer device 10 is placed at a depth position inside the analog pipe 40 by loosening the outer fastening nut 94 and the inner fastening T-nut 91.
As shown in fig. 4, the information acquisition device 8 in the present invention includes an industrial computer 81, a data acquisition card 83, and a data transmission line 82; the underwater acoustic transduction device 10 is connected with a data acquisition card 83 through a data transmission line 82; the data acquisition card 83 is connected with the industrial computer 81 through a data transmission line 82. The data acquisition card 83 in the present invention can transmit the electric signal acquisition of the underwater acoustic transducer device 10 to the industrial computer 81 through the data transmission line 82 for analysis.
As shown in fig. 5, the pressure supply device in the present invention includes a fluid replacement tank 11; the top of the liquid supplementing barrel 11 is connected with an air compressor through a high-pressure gas pipeline, and a pressure release valve 14 and a high-pressure gas source valve 13 are arranged on the high-pressure gas pipeline; a liquid level meter 12 for detecting the liquid level in the liquid replenishing barrel is arranged in the liquid replenishing barrel 11; the bottom outlet of the liquid supplementing barrel 11 is connected with one end of a pipeline quick connector 3 through a pressure supply pipeline, the other end of the pipeline quick connector 3 is connected with the inlet end of a simulation pipeline 40, and an outlet valve 15 and a safety valve 2 are sequentially arranged on the pressure supply pipeline. When in actual use, the outlet valve 15 is disconnected, the pressure relief valve 14 is opened, liquid is replenished into the liquid replenishing barrel 11 from the outlet valve 15 through the pressure supply pipeline, and the liquid level change is observed through the liquid level meter; when pressure is required to be supplied, the pressure release valve 14 is closed, high-pressure gas from the air compressor enters the liquid supplementing barrel 11 through the high-pressure gas source valve 13, the outlet valve 15 is opened, high-pressure liquid in the liquid supplementing barrel 11 enters the simulation pipeline 40 through the pressure supply pipeline and the pipeline quick connector 3 to perform pressure supply operation, when the pressure is supplied, the liquid level change of the liquid level meter 12 needs to be observed in real time, when the liquid level meter 12 displays the liquid level to be too low, the outlet valve 15 needs to be closed, the liquid supplementing operation is repeated, and the liquid in the liquid supplementing barrel 11 is prevented from being drained.
As shown in fig. 1, the ball valve 50 is arranged in the invention, so that the simulation of two leakage conditions of high-pressure flow and high-pressure no-flow in the simulation pipeline 40 can be realized, when the system is operated, the ball valve 50 is opened, and the system is used for detecting leakage information under high-pressure flow and is closer to a real pipeline; when the system is in operation, the ball valve 50 is closed, the system detects leakage information under high pressure and no flow, noise signal interference generated during liquid flow is reduced, and analysis of characteristic signals is facilitated; at the end of the system, the ball valve 50 is opened, so that the liquid in the simulation pipeline 40 can be emptied, and the simulation pipeline 40 is prevented from being corroded by the liquid.
As shown in fig. 1, in actual use, a first simulated leakage hole and a second simulated leakage hole are respectively provided on two sides of the simulated pipeline 40 corresponding to the underwater acoustic transducer device 10; wherein the upper part of the first simulated leakage hole is connected with a first flowmeter 6, and the outer side of the first flowmeter 7 is connected with a first needle valve 6; the upper part of the second simulated leakage hole is connected with the second flowmeter 30, the outer side of the second flowmeter 30 is connected with the second needle valve 20, and the simulated leakage points formed by the first flowmeter 6, the first needle valve 6, the second flowmeter 30 and the second needle valve 20 are arranged on two sides of the simulated pipeline 40, so that the characteristic signals of leakage under different flows and the changes of leakage signals at different positions can be checked. The first needle valve 6 and the second needle valve 20 in the present invention each have an inner diameter of 6mm.
Further, the simulated pipe 40 of the present invention is further provided with a pressure gauge 4 near the inlet end, and the pressure gauge 4 is used for detecting the internal pressure of the simulated pipe 40.
As shown in fig. 2, which is a schematic diagram of the leakage principle, under normal conditions, the flow state of the liquid in the pipeline is divided into two parts, namely, a laminar flow close to the pipeline wall and a turbulent flow far away from the pipeline wall, when the pipeline leaks, a larger pressure difference exists at the inner and outer pipeline walls at the leakage point, so that a turbulent jet is generated when the liquid medium runs off at the leakage point, the pipeline vibrates, a stress wave is generated when friction is generated between the turbulent jet and the pipeline wall, the variation of the leakage can be researched by collecting the amplitude-frequency characteristic of the stress wave, and the amplitude-frequency characteristic of the liquid leakage signal can be observed under different flow state working conditions by starting the turbulence generating device 5 to reduce the thickness of the laminar flow layer due to the large difference of the real working condition and the experimental device.
As shown in fig. 6, the turbulence generating means 5 of the present invention is disposed inside the dummy pipe 40 and near the inlet end of the dummy pipe 40; the turbulence generating means 5 comprises a support 51, a motor 52 and a plurality of vanes 54; the bracket 51 is arranged inside the simulation pipeline 40 and is fixedly connected with the inner wall of the simulation pipeline 40; the motor 52 is detachably mounted on the bracket 51, and a transmission shaft 53 of the motor 52 is coaxially disposed with the dummy pipe 40, and a plurality of blades 54 are mounted on the transmission shaft 53 and rotatable about an axis of the dummy pipe 40 by the transmission shaft 53. The fixed connection in the present invention includes welding. The arrangement of the turbulence generating device 5 in the invention can change the laminar flow near the inner pipe wall of the simulation pipe 40 into a turbulent flow state, thereby realizing the research of different sound signals generated by different flow states.
Further, the invention is based on the fact that when a pipeline leaks, a large pressure difference exists at the inner and outer pipe walls at the leakage point, so that turbulent flow is generated when liquid medium runs off at the leakage point, pipe wall vibration is caused, a stress wave is generated when friction is generated between the turbulent flow and the pipe wall, and the underwater sound transduction device 10 receives the stress wave and transmits the stress wave to the signal acquisition device 8. The signal acquisition means 8 may perform filtering, fft and wavelet analysis to determine the characteristics of the leakage signal by observing the frequency range and amplitude of the acquired sound signal.
Furthermore, in the invention, the leakage sound is collected, and the time domain and frequency domain characteristics of the data are observed by using Fourier transformation, so that low-pass filtering can be performed to remove environment and unnecessary interference.
The invention also provides a test method of the test system for the micro leakage of the pipeline liquid medium based on the sound wave, which comprises the following steps:
1) Opening the pressure supply device 1, closing the ball valve 50 and the turbulence generating device 5, detecting leakage of different opening degrees of the first needle valve 6, recording the numerical value of the first flowmeter 7, observing the acoustic signals acquired by the underwater acoustic transduction device 10 through the information acquisition device 8, storing and analyzing, and closing the first needle valve 6 after the test is finished;
2) Opening the second needle valve 20, detecting leakage of different opening degrees of the second needle valve 20, recording the numerical value of the second flowmeter 30, observing the acoustic signals collected by the underwater acoustic transduction device 10 through the information collection device 8, storing and analyzing, and closing the second needle valve 20 after the test is finished;
3) Opening the ball valve 50, repeating the step 1 and the step 2, and closing the ball valve 50 after the test is finished, so as to finish the detection of the leakage sound signal under the high-pressure flow;
4) Adjusting the depth of the underwater sound transducer 10 in the analog pipeline 40, and repeating the steps 1-3 to finish the detection of the leakage sound signals of the underwater sound transducer 10 at different depths;
5) Closing the pressure supply device 1, opening the ball valve 50 to discharge the residual liquid in the simulation pipeline 40, and disconnecting the pipeline quick connector 3;
6) The collected and stored leakage signals are analyzed by means of the signal collection device 8.
Further, the test method disclosed by the invention further comprises the following steps: the air tightness inspection specifically comprises the following steps:
connecting the pressure supply device 1 with the analog pipe 40, and closing the ball valve 50, the first needle valve 6, and the second needle valve 20;
slowly supplying pressure by using a pressure supply device 1, observing the value of the pressure gauge 4 to a required pressure value, and stopping supplying pressure;
observing the pressure drop condition of the system and observing whether the acquired acoustic signals change or not through the information acquisition device 8;
if the air tightness is unchanged, the air tightness is good; if there is a change, it is indicated that the air tightness is poor, and it is necessary to check each connection point of the analog pipeline 40.
Further, the test method disclosed by the invention further comprises the following steps: turbulence testing, comprising:
opening the turbulence generating means 5 placed inside the simulated tube 40;
and (5) repeating the steps 1-5 to finish detection of the leakage sound signals under turbulent flow.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The system is characterized by comprising a simulation pipeline and a water sound transduction device, wherein the water sound transduction device is installed inside the simulation pipeline in a lifting manner through a lifting piece;
the inlet end of the simulation pipeline is connected with the pressure supply device, and the outlet end of the simulation pipeline is connected with the ball valve;
two sides of the simulation pipeline, which correspond to the underwater acoustic transduction device, are respectively provided with a simulation leakage hole, and each simulation leakage hole is provided with a needle valve for controlling the leakage size and a flowmeter for detecting the leakage quantity;
the underwater acoustic transducer is connected with the signal acquisition device through a signal wire, and the signal acquisition device is used for receiving, storing and analyzing the signals acquired by the underwater acoustic transducer.
2. The acoustic wave based pipe liquid medium micro leakage test system according to claim 1, wherein the lifting member comprises an external fastening nut, a custom gasket, an internal rubber gasket, an internal fastening T-nut;
the underwater acoustic transducer is a hydrophone, a probe part of the hydrophone is arranged in the analog pipeline, and a stud part of the underwater acoustic transducer sequentially penetrates through the inner fastening T-shaped nut, the inner rubber gasket, the side wall of the analog pipeline and the special gasket and then is connected with the outer fastening nut.
3. The acoustic wave based pipeline liquid medium micro leakage testing system according to claim 2, wherein the bottom of the special gasket is of a cambered surface structure which is fit with the outer edge surface of the simulated pipeline, and the top of the special gasket is of a planar structure which is fit with the external fastening nut;
the top of the internal fastening T-shaped nut is of an arc surface structure matched with the inner edge surface of the simulation pipeline.
4. The acoustic wave based pipeline liquid medium micro leakage test system according to claim 1, wherein the pressure supply device comprises a liquid supplementing barrel;
the top of the liquid supplementing barrel is connected with an air compressor through a high-pressure gas pipeline, and a pressure release valve and a high-pressure gas source valve are arranged on the high-pressure gas pipeline;
a liquid level meter for detecting the liquid level in the liquid supplementing barrel is arranged in the liquid supplementing barrel;
the bottom outlet of the liquid supplementing barrel is connected with one end of a pipeline quick connector through a pressure supply pipeline, the other end of the pipeline quick connector is connected with the inlet end of the simulation pipeline, and an outlet valve and a safety valve are sequentially arranged on the pressure supply pipeline.
5. The acoustic wave based pipeline liquid medium micro leakage test system according to claim 1, wherein the information acquisition device comprises an industrial computer, a data acquisition card and a data transmission line;
the underwater sound transduction device is connected with the data acquisition card through the data transmission line;
the data acquisition card is connected with the industrial computer through the data transmission line.
6. The acoustic wave based pipe liquid medium micro leakage test system according to claim 1, wherein the simulated pipe is further provided with a pressure gauge at a position close to the inlet end, and the pressure gauge is used for detecting the internal pressure of the simulated pipe.
7. The acoustic wave based pipeline liquid medium micro-leakage testing system of claim 1, further comprising a turbulence generating device disposed inside the simulated pipeline and disposed proximate an inlet end of the simulated pipeline;
the turbulence generating device comprises a bracket, a motor and a plurality of blades; the support is arranged in the simulation pipeline and is fixedly connected with the inner wall of the simulation pipeline;
the motor is detachably mounted on the support, the transmission shaft of the motor and the simulation pipeline are coaxially arranged, a plurality of blades are mounted on the transmission shaft, and the blades can rotate around the axis of the simulation pipeline through the transmission shaft.
8. A method of testing a system for testing for micro-leakage of liquid medium in a pipe based on acoustic waves as claimed in any one of claims 1 to 7, comprising:
1) Opening the pressure supply device, closing the ball valve, detecting leakage of different opening degrees of one needle valve, recording the numerical value of a flow meter matched with the valve, observing acoustic signals acquired by the underwater acoustic transducer through the information acquisition device, storing and analyzing the acoustic signals, and closing the needle valve after the test is finished;
2) Opening another needle valve, detecting leakage of different opening degrees of the other needle valve, recording the numerical value of a flow meter matched with the other needle valve, observing acoustic signals acquired by a water acoustic transduction device through the information acquisition device, storing and analyzing the acoustic signals, and closing the needle valve after the test is finished;
3) Opening the ball valve, repeating the step 2-3, closing the ball valve after the test is finished, and completing detection of leakage sound signals under high-pressure flow;
4) Adjusting the depth of the underwater sound transduction device in the simulation pipeline, and repeating the steps 2-4 to finish detection of leakage sound signals of different depths of the underwater sound transduction device in the simulation pipeline;
5) And closing the pressure supply device, opening the ball valve, and discharging the residual liquid in the simulation pipeline.
9. The method of testing of claim 8, further comprising: the air tightness inspection specifically comprises:
connecting the pressure supply device with the simulation pipeline, and closing the ball valve and the two needle valves;
slowly supplying pressure by using a pressure supply device, and stopping supplying pressure when the pressure value in the analog pipeline reaches a required pressure value;
observing the pressure drop condition of the system and observing whether the acquired acoustic signals are changed or not through an information acquisition device, if not, indicating that the air tightness is good; if there is a change, it is indicated that the air tightness is poor and each connection point of the simulation pipeline needs to be checked.
10. The method of testing of claim 8, further comprising: turbulence testing, specifically including:
opening a turbulence generating device arranged in the simulation pipeline;
repeating steps 1-5 of claim 1 to complete detection of the leakage acoustic signal of the turbulent flow.
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