CN117740883A - Detection method and device for pipeline blockage - Google Patents
Detection method and device for pipeline blockage Download PDFInfo
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- CN117740883A CN117740883A CN202311761122.8A CN202311761122A CN117740883A CN 117740883 A CN117740883 A CN 117740883A CN 202311761122 A CN202311761122 A CN 202311761122A CN 117740883 A CN117740883 A CN 117740883A
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- 238000001514 detection method Methods 0.000 title claims abstract description 46
- 229920000426 Microplastic Polymers 0.000 claims abstract description 82
- 239000002184 metal Substances 0.000 claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 claims abstract description 46
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 38
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052802 copper Inorganic materials 0.000 claims abstract description 32
- 239000010949 copper Substances 0.000 claims abstract description 32
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 19
- 229920000642 polymer Polymers 0.000 claims abstract description 13
- 238000007747 plating Methods 0.000 claims abstract description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims description 25
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 24
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 17
- 239000000696 magnetic material Substances 0.000 claims description 10
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 5
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 10
- 239000008188 pellet Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention provides a detection method for pipeline blockage, which comprises the following steps: s1, providing a high polymer plastic pellet, and plating nickel metal on the surface of the high polymer plastic pellet to form a magnetic plastic pellet; s2, placing the magnetic plastic pellets beside magnetic control equipment so as to magnetize the magnetic plastic pellets; s3, installing a copper electrode in a region to be detected of the pipeline to be detected; s4, providing an electric signal detection instrument, and electrically connecting the electric signal detection instrument with the copper electrode through a lead; s5, placing the magnetized magnetic plastic pellets in a pipeline to be detected, controlling the magnetized magnetic plastic pellets to pass through a region to be detected of the pipeline to be detected through magnetic control equipment, observing whether an electric signal detection instrument generates a current signal, and judging whether the pipeline to be detected is blocked. In addition, the invention also provides a device for realizing the detection method, which has the advantages of simple structure, convenient operation, wide applicability, high detection efficiency and capability of accurately monitoring the blocking position of the pipeline to be detected.
Description
Technical Field
The invention relates to the technical field of pipeline blockage detection, in particular to a detection method and device for pipeline blockage.
Background
Pipeline transportation is a key link of modern industrial production and civil water supply. However, due to long-term use and external factors, blockage problems often occur inside the pipeline, resulting in various adverse consequences such as flow reduction, energy waste, equipment damage, and the like. Therefore, how to quickly and accurately detect the pipe blockage becomes an urgent problem to be solved. The traditional pipeline blockage detection method is generally an observation method, a pressure difference method, a flow measurement method and the like, has the problems of high time consumption, poor accuracy and the like, and is difficult to meet the requirements of modern industrial production.
In order to solve the problems, research discovers that the friction nano power generation technology utilizes friction electrification and static induction phenomena in the friction process of different materials, can make up the defects of the traditional pipeline blockage detection method, realizes high-sensitivity and accurate monitoring of pipeline blockage, and has the advantages of cost effectiveness and the like.
Accordingly, it is desirable to provide a method and apparatus for detecting pipe blockage that addresses the above issues.
Disclosure of Invention
The invention aims at overcoming the technical defects in the prior art and provides a detection method and a detection device for pipeline blockage.
In order to achieve the purpose of the invention, the technical scheme adopted is as follows:
a method for detecting a pipe blockage, the method comprising:
s1, providing a high polymer plastic pellet, and plating a magnetic material on the surface of the high polymer plastic pellet to form the magnetic plastic pellet;
s2, placing the magnetic plastic pellets beside magnetic control equipment so as to magnetize the magnetic plastic pellets;
s3, installing a metal electrode in a region to be detected of the pipeline to be detected, and enabling the metal electrode to be closely adhered to and encircle the outer side of the pipeline to be detected;
s4, providing an electric signal detection instrument, and electrically connecting the electric signal detection instrument with the copper electrode through a lead;
s5, placing the magnetized magnetic plastic pellets in the pipeline to be detected, controlling the magnetized magnetic plastic pellets to pass through a region to be detected of the pipeline to be detected through the magnetic control equipment, observing whether the electric signal detection instrument generates a current signal or not, and judging that the pipeline to be detected is blocked if no current signal is generated; if a current signal is generated, judging that the pipeline to be detected is not blocked.
Preferably, the polymer plastic pellets are polytetrafluoroethylene plastic pellets, the surfaces of the polytetrafluoroethylene plastic pellets are plated with magnetic materials in a magnetron sputtering mode, and the magnetic materials are nickel metal.
Preferably, the diameter of the polytetrafluoroethylene plastic pellet ranges from 0.5mm to 50mm, and the thickness of nickel plating metal on the surface of the polytetrafluoroethylene plastic pellet ranges from 100nm to 1000 nm.
Preferably, the magnetic control device is a strong magnet.
Preferably, the metal electrode is a copper electrode, the thickness of the copper electrode is between 0.05mm and 1mm, and the copper electrode is adhered and surrounds the outer side of the pipeline to be tested through an adhesive tape.
Preferably, the electrical signal detection instrument is a Keithley6514 electrometer.
The embodiment of the invention also provides a detection device for pipeline blockage, which comprises a pipeline to be detected, a metal electrode encircling and attached to the outer side of the pipeline to be detected, a magnetic plastic small ball arranged in the pipeline to be detected, magnetic control equipment positioned on the outer side of the pipeline to be detected and used for magnetizing the magnetic plastic small ball, and an electric signal detection instrument electrically connected with the metal electrode.
Preferably, the positive electrode end of the electric signal detection instrument is connected with the metal electrode, and the negative electrode end of the electric signal detection instrument is grounded.
Preferably, the metal electrode is a copper electrode, the copper electrode comprises two copper electrodes, and the two copper electrodes are oppositely arranged at the outer side of the pipeline to be detected at intervals.
Compared with the related art, the detection method and the detection device for the pipeline blockage are realized by utilizing the working principle of the friction nano generator in a single electrode mode, the magnetized magnetic plastic pellets are controlled to move through the region to be detected of the pipeline to be detected by the magnetic control equipment, the magnetic plastic pellets rub with liquid in the pipeline to be detected, so that the magnetic plastic pellets are negatively charged, and according to the electrostatic induction effect, the magnetic plastic pellets cause the charge transfer of the metal electrode outside the pipeline to generate a current signal, so that the pellets are determined to pass smoothly, and whether the pipeline is blocked or not is judged. The detection method and the detection device for the pipeline blockage provided by the invention have the advantages of simple structure, convenience in operation, no damage, simplicity, rapidness and low cost, and can determine the position of the pipeline blockage.
Drawings
The present invention will be described in detail with reference to the accompanying drawings. The foregoing and other aspects of the invention will become more apparent and more readily appreciated from the following detailed description taken in conjunction with the accompanying drawings. In the accompanying drawings:
FIG. 1 is a schematic flow chart of a method for detecting pipe blockage according to the present invention;
FIG. 2 is a schematic diagram of a device for detecting pipe blockage according to the present invention;
fig. 3 is a schematic diagram of the operation of a detection device for pipe blockage according to the present invention.
Detailed Description
The detailed description/examples set forth herein are specific embodiments of the invention and are intended to illustrate the concepts of the invention, and are intended to be illustrative and exemplary, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to adopt other obvious solutions based on the disclosure of the claims and specification of the present application, including those adopting any obvious substitutions and modifications to the embodiments described herein, all within the scope of the present invention.
Referring to fig. 1, the present invention provides a method for detecting a pipe blockage, comprising:
s1, providing a high polymer plastic pellet, and plating nickel metal on the surface of the high polymer plastic pellet to form a magnetic plastic pellet;
s2, placing the magnetic plastic pellets beside magnetic control equipment so as to magnetize the magnetic plastic pellets;
s3, installing a copper electrode in a region to be detected of the pipeline to be detected, and enabling the copper electrode to be closely adhered to and encircle the outer side of the pipeline to be detected;
s4, providing an electric signal detection instrument, and electrically connecting the electric signal detection instrument with the copper electrode through a lead;
s5, placing the magnetized magnetic plastic pellets in the pipeline to be detected, controlling the magnetized magnetic plastic pellets to pass through a region to be detected of the pipeline to be detected through the magnetic control equipment, observing whether the electric signal detection instrument generates a current signal or not, and judging that the pipeline to be detected is blocked if no current signal is generated; if a current signal is generated, judging that the pipeline to be detected is not blocked.
The detection method is realized by utilizing the working principle of a friction nano generator in a single electrode mode, the magnetized magnetic plastic pellets are controlled by a magnetic control device to move through a region to be detected of a pipeline to be detected, the magnetic plastic pellets rub with liquid in the pipeline to be detected, so that the magnetic plastic pellets are negatively charged, and according to an electrostatic induction effect, the magnetic plastic pellets cause the charge transfer of a metal electrode at the outer side of the pipeline to generate a current signal, so that the pellets are determined to pass smoothly, and whether the pipeline is blocked is judged. The detection method and the detection device for the pipeline blockage provided by the invention have the advantages of simple structure, convenience in operation, no damage, simplicity, rapidness and low cost, and can determine the position of the pipeline blockage.
Specifically, the polymer plastic pellets are polytetrafluoroethylene plastic pellets, the surfaces of the polytetrafluoroethylene plastic pellets are plated with magnetic materials in a mode of magnetron sputtering or electrochemical coating and the like, and the magnetic materials are nickel metal. Of course, the polymer plastic pellets are not limited thereto, and may be polyvinylidene fluoride plastic pellets or polydimethylsiloxane plastic pellets, and the magnetic material may be a magnetic material such as iron, cobalt, nickel, or a compound thereof. The material is various, and the polymer plastic pellets with different materials can be selected for the pipelines to be tested of different liquids, so that the device is suitable for the pipelines of various liquids, such as water delivery pipes, oil delivery pipes and other pipelines for liquid delivery.
In the embodiment, the diameter of the polytetrafluoroethylene plastic small ball ranges from 0.5mm to 50mm, and the thickness of nickel plating metal on the surface of the polytetrafluoroethylene plastic small ball ranges from 100nm to 1000 nm. In addition, the larger the diameter of the polytetrafluoroethylene plastic pellet is, the stronger the magnetic field intensity is needed to control the magnet, the thickness of the corresponding nickel plating layer also needs to be increased, the diameter of the polytetrafluoroethylene plastic pellet can be adjusted according to the diameter of the pipeline to be measured, and the application range is wide.
Further, the magnetic control device is a strong magnet or a Helmholtz coil, and the magnetic field generated by the magnetic control device can be in the range of 0.5T-5T.
In this embodiment, the metal electrode is an annular copper electrode, the thickness of the copper electrode is between 0.05mm and 1mm, and the copper electrode is adhered to and surrounds the outer side of the pipeline to be tested through an adhesive tape.
Further, the electrical signal detecting apparatus is a Keithley6514 electrometer, of course, the model thereof is not limited thereto.
Referring to fig. 2-3, the present invention further provides a device for detecting a pipe blockage, which includes a pipe 5 to be detected, a metal electrode 6 surrounding and attached to the outer side of the pipe 5 to be detected, a magnetic plastic pellet 3 placed in the pipe to be detected, a magnetic control apparatus 1 located on the outer side of the pipe 5 to be detected and used for magnetizing the magnetic plastic pellet, and an electrical signal detecting instrument 7 electrically connected with the metal electrode.
In this embodiment, the positive terminal of the electrical signal detecting device 7 is connected to the metal electrode 6, and the negative terminal of the electrical signal detecting device 7 is grounded. The metal electrodes 6 are copper electrodes, the number of the copper electrodes is two, and the two copper electrodes are oppositely arranged at the outer side of the pipeline 5 to be detected at intervals.
It should be noted that, please refer to fig. 3, which is a working flow of the detection device for pipe blockage provided by the present invention, when the magnetic plastic pellets 3 are located at the position shown in the state 1, the liquid in the pipe to be detected flows to rub against the magnetic plastic pellets 3, and the magnetic plastic pellets 3 are negatively charged due to the material property of the magnetic plastic pellets 3; when the magnetic control equipment 1 controls the magnetic plastic pellets 3 to move to the state 2 position, the negatively charged magnetic plastic pellets 3 repel electrons to flow out of the annular metal electrode outside the pipeline to be detected, the annular metal electrode is positively charged, and the electric signal detection instrument detects a current signal; when the magnetic control equipment 1 further controls the magnetic plastic pellets 3 to the position of the state 3, the magnetic plastic pellets 3 are far away from the annular metal electrode 6 at the outer side of the pipeline 5 to be tested, electrons of the metal electrode 6 flow back, and the electrode returns to static balance.
To further demonstrate the invention, the following three experiments were used for illustration:
experiment 1: performing magnetron sputtering on the surface of a polytetrafluoroethylene plastic pellet with the diameter of 10mm to obtain nickel metal, wherein the thickness of a nickel metal layer is 500nm; placing the pellets covered with the nickel metal layer on the surface of the pellets beside a strong magnet with the magnetic field strength of 1T, so that the pellets are magnetized for 12 hours; copper electrodes are arranged in a region to be measured on the outer side of a pipeline to be measured 5 with the inner diameter of 20mm, so that the electrodes are tightly attached to and encircle the outer side of the pipeline, and a wire is connected; connecting the positive electrode of a Keithley6514 electrometer with a ring-shaped metal electrode, and grounding the negative electrode to form a friction nano generator in a single electrode mode, wherein the Keithley6514 electrometer is used for observing whether a current signal is generated by the instrument; and controlling the polytetrafluoroethylene plastic pellets 3 to pass through a region to be detected of the pipeline to be detected by using a strong magnet 1 with the magnetic field strength of 1T, and observing whether a Keithley6514 electrometer generates current or not, so as to judge whether the pipeline is blocked.
Experiment 2, sputtering nickel metal on the surface of a polytetrafluoroethylene plastic pellet with the diameter of 2mm in a magnetron manner, wherein the thickness of a nickel metal layer is 500nm; placing polytetrafluoroethylene plastic pellets with surfaces covered with nickel metal layers beside a strong magnet with the magnetic field strength of 1T, so that the pellets are magnetized for 12 hours; copper electrodes are arranged in a region to be measured on the outer side of a pipeline to be measured 5mm in inner diameter, so that the electrodes are tightly attached to and encircle the outer side of the pipeline, and a wire is connected; connecting the positive electrode of a Keithley6514 electrometer with a ring-shaped metal electrode, and grounding the negative electrode to form a friction nano generator in a single electrode mode, wherein the Keithley6514 electrometer is used for observing whether a current signal is generated by the instrument; and controlling the polytetrafluoroethylene plastic pellets 3 to pass through a region to be detected of the pipeline to be detected by using a strong magnet 1 with the magnetic field strength of 1T, and observing whether a Keithley6514 electrometer generates current or not, so as to judge whether the pipeline is blocked.
Experiment 3, magnetron sputtering nickel metal on the surface of polytetrafluoroethylene plastic pellets with the diameter of 10mm, wherein the thickness of the nickel metal layer is 500nm; placing the pellets covered with the nickel metal layer on the surface of the pellets beside a strong magnet with the magnetic field strength of 1T, so that the pellets are magnetized for 12 hours; installing a copper electrode in a region to be tested on the outer side of the blocked pipeline to be tested 5 with the inner diameter of 20mm, ensuring that the electrode is tightly attached to and surrounds the outer side of the pipeline, and connecting a lead; connecting the positive electrode of a Keithley6514 electrometer with a ring-shaped metal electrode, and grounding the negative electrode to form a friction nano generator in a single electrode mode, wherein the Keithley6514 electrometer is used for observing whether a current signal is generated by the instrument; and controlling the polytetrafluoroethylene plastic pellets 3 to pass through the region to be detected by using a strong magnet 1 with the magnetic field strength of 1T, and observing whether current is generated by an electrometer or not, thereby judging whether a pipeline is blocked.
The test results of the examples are as follows, by observing the Keithley6514 electrometer for current to determine if the tubing is plugged:
| experiment | Electrometer current signal |
| Experiment 1 | Has a signal, a strong signal |
| Experiment 2 | With signal, weak signal |
| Experiment 3 | No signal |
As shown in the test result, compared with the test result in the test 1 and the test 2, the inner diameter of the pipeline to be tested and the diameter of the polytetrafluoroethylene plastic pellets in the test 1 are both larger than those in the test 2, so that the polytetrafluoroethylene plastic pellets induce more static charges due to friction, and the signal tested by the electrometer is stronger; experiment 1 compares experiment 3, because the pipeline to be detected is blocked, polytetrafluoroethylene plastic pellets do not pass through the metal electrode at the blocking position, so that no signal is generated, and therefore, the blocking position in the pipeline can be determined through the electrode position.
Compared with the related art, the detection method and the detection device for the pipeline blockage are realized by utilizing the working principle of the friction nano generator in a single electrode mode, the magnetized magnetic plastic pellets are controlled to move through the region to be detected of the pipeline to be detected by the magnetic control equipment, the magnetic plastic pellets rub with liquid in the pipeline to be detected, so that the magnetic plastic pellets are negatively charged, and according to the electrostatic induction effect, the magnetic plastic pellets cause the charge transfer of the metal electrode outside the pipeline to generate a current signal, so that the pellets are determined to pass smoothly, and whether the pipeline is blocked or not is judged. The detection method and the detection device for the pipeline blockage provided by the invention have the advantages of simple structure, convenience in operation, no damage, simplicity, rapidness and low cost, and can determine the position of the pipeline blockage.
The above description is only of the preferred embodiments 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 such modifications, equivalents, and improvements that fall within the spirit and principles of the present invention are intended to be covered by the following claims.
Claims (9)
1. A method for detecting a pipe blockage, the method comprising:
s1, providing a high polymer plastic pellet, and plating a magnetic material on the surface of the high polymer plastic pellet to form the magnetic plastic pellet;
s2, placing the magnetic plastic pellets beside magnetic control equipment so as to magnetize the magnetic plastic pellets;
s3, installing a metal electrode in a region to be detected of the pipeline to be detected, and enabling the metal electrode to be closely adhered to and encircle the outer side of the pipeline to be detected;
s4, providing an electric signal detection instrument, and electrically connecting the electric signal detection instrument with the copper electrode through a lead;
s5, placing the magnetized magnetic plastic pellets in the pipeline to be detected, controlling the magnetized magnetic plastic pellets to pass through a region to be detected of the pipeline to be detected through the magnetic control equipment, observing whether the electric signal detection instrument generates a current signal or not, and judging that the pipeline to be detected is blocked if no current signal is generated; if a current signal is generated, judging that the pipeline to be detected is not blocked.
2. The method for detecting pipeline blockage according to claim 1, wherein the high polymer plastic pellets are polytetrafluoroethylene plastic pellets, the surfaces of the polytetrafluoroethylene plastic pellets are plated with magnetic materials in a magnetron sputtering mode, and the magnetic materials are nickel metal.
3. The method for detecting pipeline blockage according to claim 2, wherein the diameter of the polytetrafluoroethylene plastic pellet ranges from 0.5mm to 50mm, and the thickness of nickel plating metal on the surface of the polytetrafluoroethylene plastic pellet ranges from 100nm to 1000 nm.
4. The method for detecting a pipe blockage according to claim 1, wherein the magnetic control device is a strong magnet.
5. The method for detecting pipe blockage according to claim 1, wherein the metal electrode is a copper electrode, the thickness of the copper electrode is between 0.05mm and 1mm, and the copper electrode is adhered and surrounds the outer side of the pipe to be detected through an adhesive tape.
6. A method for detecting a pipe blockage according to claim 1, wherein the electrical signal detection instrument is a Keithley6514 electrometer.
7. The detection device for pipeline blockage is characterized by comprising a pipeline to be detected, a copper electrode, a magnetic plastic pellet, magnetic control equipment and an electric signal detection instrument, wherein the copper electrode surrounds and is attached to the outer side of the pipeline to be detected, the magnetic plastic pellet is placed in the pipeline to be detected, the magnetic control equipment is positioned on the outer side of the pipeline to be detected and used for magnetizing the magnetic plastic pellet, and the electric signal detection instrument is electrically connected with metal.
8. The method for detecting a pipe blockage according to claim 7, wherein a positive electrode terminal of the electric signal detecting instrument is connected to the metal, and a negative electrode terminal of the electric signal detecting instrument is grounded.
9. The method for detecting pipe blockage according to claim 8, wherein the metal electrode is a copper electrode, the copper electrode comprises two copper electrodes, and the two copper electrodes are oppositely arranged at the outer side of the pipe to be detected at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311761122.8A CN117740883A (en) | 2023-12-19 | 2023-12-19 | Detection method and device for pipeline blockage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311761122.8A CN117740883A (en) | 2023-12-19 | 2023-12-19 | Detection method and device for pipeline blockage |
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| Publication Number | Publication Date |
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| CN117740883A true CN117740883A (en) | 2024-03-22 |
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| CN202311761122.8A Pending CN117740883A (en) | 2023-12-19 | 2023-12-19 | Detection method and device for pipeline blockage |
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| WO2023216698A1 (en) * | 2022-05-11 | 2023-11-16 | 北京纳米能源与系统研究所 | Annular hybrid power generation unit, preparation method therefor, and wave energy power generation device |
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