CN111486940A - Self-powered sensor for monitoring vibration of marine riser - Google Patents
Self-powered sensor for monitoring vibration of marine riser Download PDFInfo
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- CN111486940A CN111486940A CN202010533276.1A CN202010533276A CN111486940A CN 111486940 A CN111486940 A CN 111486940A CN 202010533276 A CN202010533276 A CN 202010533276A CN 111486940 A CN111486940 A CN 111486940A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
Abstract
The invention relates to the field of ocean engineering equipment, in particular to a self-powered sensor for monitoring the vibration of an ocean riser, which comprises a shell, wherein a first electrode plate and a second electrode plate are arranged on two opposite sides in the shell; a resonant plate with a dielectric film on the surface is arranged between the first electrode plate and the second electrode plate; the resonant plate is connected with the first electrode plate through a first elastic piece, and the resonant plate is connected with the second electrode plate through a second elastic piece; the resonator plate is movable within the housing by compressing the first and second resilient members. The actual amplitude of the measured vertical pipe is calculated by using a voltage value obtained by friction power generation of the resonance plate and the electrode plate, so that the vibration of the vertical pipe can be detected in time; and an auxiliary power supply is not required to be carried, so that the number of components of the sensor is reduced, the size and the weight of the sensor are reduced, and the influence on the stability of the vertical pipe is avoided.
Description
Technical Field
The invention relates to the field of hull cleaning equipment, in particular to a self-powered sensor for monitoring marine riser vibration.
Background
With the dramatic increase in human demand for energy, the rapid consumption of land resources has led to the initiation of human attention to the development of marine resources. At present, the development of marine resources is mainly oil and gas, and the exploitation technology is generally to transport the oil and gas from the sea bottom to the platform through a riser by drilling for processing and storage.
The riser as the sole transport channel plays an important role in the development of marine resources. Due to the complexity of the marine environment, in order to prevent serious leakage accidents from occurring in the mining process, the stress deformation and vibration of the riser in the sea need to be monitored in real time, and therefore, a certain number of various sensors are arranged on the riser to monitor the motion of the riser. For these sensors distributed on the pipeline, electric power is needed for normal operation. The batteries are replaced over time, which adds significantly to the cost of riser monitoring. The use of cables for power supply undoubtedly makes the entire monitoring system cumbersome and increases the instability of the monitoring.
Patent document with application number "CN 201510381858.1" discloses a pendulum type marine riser vortex-induced vibration is from generating electricity monitoring devices, through install a monitoring devices who generates electricity on the riser, can produce electric power when the riser takes place to vibrate to with electric power supply sensor, make the electric power of sensor can be self-sufficient. However, when the riser does not vibrate for a longer period of time, the sensor stops sensing without power support, and when the riser vibrates again, the device regenerates power, but the restarting sensor has no way of sensing the riser vibration in time, and there is also a risk that the initial power of the regeneration is insufficient to activate the sensor. Meanwhile, the self-generating monitoring device comprises a power generation assembly and a sensor for detection, so that the device is large in size and easily influences the stability of the stand pipe.
Disclosure of Invention
The invention aims to solve the problem that the self-generating monitoring device in the prior art is not timely powered or the sensor is not timely detected, and provides the self-powered sensor for monitoring the vibration of the marine riser.
In order to solve the technical problems, the invention adopts the technical scheme that: a self-powered sensor for monitoring vibration of a marine riser comprises a shell, wherein a first electrode plate and a second electrode plate are arranged on two opposite sides in the shell; a resonant plate with a dielectric film on the surface is arranged between the first electrode plate and the second electrode plate; the resonance plate is connected with the first electrode plate through a first elastic piece, and the resonance plate is connected with the second electrode plate through a second elastic piece; the resonance plate moves in the housing by compressing the first elastic member or the second elastic member.
The self-powered sensor is arranged on the marine riser, and the axial lead of the shell is perpendicular to the axial lead of the riser. The first electrode plate, the second electrode plate and the resonant plate are connected with an external detection circuit. When the vertical pipe does not vibrate, the resonance plate does not vibrate, and the resonance plate and the electrode do not contact to generate induced charges; when the vertical pipe vibrates, the shell vibrates along with the vertical pipe, the resonant plate compresses the first elastic part or the second elastic part due to inertia to move in the shell, and when the vibration amplitude reaches the set amplitude, the resonant plate is contacted with the electrode plate. When the resonant plate is contacted with the electrode plate, the dielectric film attached to the resonant plate is in frictional contact with the electrode on the electrode plate, and the surfaces of the resonant plate and the electrode plate are respectively charged with positive charges and negative charges because two different materials have different electrode sequences. When the two plates are separated, an induced potential difference is generated between the left electrode plate and the right electrode plate, charge transfer occurs, current and voltage are generated in an external circuit connected to the two electrodes, the resonance plate moves between the first electrode plate and the second electrode plate through the compression elastic element and under the elastic action of the elastic element, and currents in different flow directions are generated, so that an external detection circuit detects a resonance electric signal.
Due to the resonance principle, the vibration amplitude of the resonance plate reflects the vibration amplitude of the riser, different electric signals can be generated due to the difference of the vibration amplitudes of the resonance plate, and the amplitude condition of the marine riser can be calculated according to the difference of the electric signals.
Preferably, a fixing shaft penetrating through the resonance plate is further arranged between the first electrode plate and the second electrode plate, two ends of the fixing shaft are respectively connected with the first electrode plate and the second electrode plate, and the resonance plate moves along the fixing shaft. The resonance plate moves along the fixed shaft, so that the resonance plate is prevented from shaking up and down during movement to influence the contact between the resonance plate and the electrode plate.
Preferably, the axes of the first electrode plate, the second electrode plate, the resonance plate and the fixed shaft are all on the same straight line. The first electrode plate, the second electrode plate, and the resonator plate may be circular, polygonal, or irregular, and are preferably circular to avoid movement resistance due to edges and corners. And the fixed shaft is connected with the axes of the first electrode plate, the second electrode plate and the resonance plate, so that the resonance plate keeps balance everywhere during movement, is not easy to swing, and is convenient to generate larger contact area with the first electrode plate and the second electrode plate, thereby generating larger current.
Preferably, the first electrode plate and the second electrode plate are fixedly connected with the inner wall of the shell, so that the first electrode plate and the second electrode plate are prevented from shaking up and down relative to the shell, and errors are brought to measurement; the inner ring of the resonance plate is attached to the outer surface of the fixed shaft, so that the resonance plate is prevented from swinging up and down during movement, and the measurement accuracy is prevented from being influenced.
Preferably, the first elastic element and the second elastic element are equally spaced along the circumference of the resonator plate, and may be disposed at the center of the resonator plate. Preferably, the first elastic part and the second elastic part are both springs, and the springs are sleeved on the fixed shaft; the elastic element is arranged at one position, so that the resonant plate can smoothly reciprocate, the area occupied by the elastic element is reduced, and the resonant plate has more area to be contacted with the electrode plate. The first electrode plate with the second electrode plate all is provided with the mounting groove, the fixed axle with the spring all packs into in the mounting groove. When the resonant plate compresses the springs, the compressed springs are all positioned in the mounting grooves, and the contact friction between the resonant plate and the electrode plate cannot be influenced.
Preferably, the first electrode plate, the second electrode plate and the resonance plate are all plastic plates, and the plastic plates are made of lighter materials, so that the weight of the whole sensor is reduced, and the burden on the vertical pipe is reduced; electrode films are arranged on one sides, close to the resonance plate, of the first electrode plate and the second electrode plate; the dielectric films are respectively arranged on the surface of the resonance plate close to the first electrode plate and the surface of the resonance plate close to the second electrode plate. The electrode film and the dielectric film are laid on the plastic plate, so that the resonance plate can generate electric charges by friction when contacting the first electrode plate or the second electrode plate, and can generate current when being separated.
Preferably, the electrode film is made of any one of a metal material, an insulating material or a semiconductor material; the dielectric film and the electrode film are made of different materials. The electrode film and the dielectric film can generate positive and negative charges respectively due to different materials,
preferably, the electrode film is made of a copper film, and the dielectric film is made of polytetrafluoroethylene.
Preferably, the surface of the electrode film and the surface of the dielectric film are distributed with nano or sub-nano micro structures. The microstructure is easier to generate friction and charge, and the power generation efficiency of the electrode film and the dielectric film is improved.
Preferably, the electrode thin film and the dielectric thin film have the same area, and when vibration occurs, the maximum power generation amount can be generated between the resonance plate and the electrode plate.
Compared with the prior art, the beneficial effects are: the actual amplitude of the measured vertical pipe is calculated by using a voltage value obtained by friction power generation of the resonance plate and the electrode plate, so that the vibration of the vertical pipe can be detected in time; and an auxiliary power supply is not required to be carried, so that the number of components of the sensor is reduced, the size and the weight of the sensor are reduced, and the influence on the stability of the vertical pipe is avoided.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a self-powered sensor for monitoring marine riser vibration according to the present invention;
FIG. 2 is a schematic diagram of the power generation of a self-powered sensor of the present invention for monitoring marine riser vibration;
FIG. 3 is a schematic diagram of the internal structure of another embodiment of a self-powered sensor of the present invention for monitoring marine riser vibration.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1
1-2, an embodiment of a self-powered sensor for monitoring marine riser vibration includes a housing 1, a first electrode plate 2 and a second electrode plate 3 mounted on opposite sides of the housing 1; a resonant plate 5 with a dielectric film 4 on the surface is arranged between the first electrode plate 2 and the second electrode plate 3; the resonant plate 5 is connected with the first electrode plate 2 through a first elastic element 6, and the resonant plate 5 is connected with the second electrode plate 3 through a second elastic element 7; the resonator plate 5 is movable within the housing 1 by compressing the first spring 6 and the second spring 7.
Specifically, a fixed shaft 8 penetrating through the resonance plate 5 is further arranged between the first electrode plate 2 and the second electrode plate 3, the axes of the first electrode plate 2, the second electrode plate 3, the resonance plate 5 and the fixed shaft 8 are all located on the same straight line, two ends of the fixed shaft 8 are respectively connected with the first electrode plate 2 and the second electrode plate 3, and the resonance plate 5 moves along the fixed shaft 8.
The resonance plate 5 moves along the fixed shaft 8, keeps balance everywhere, is not easy to swing, avoids influencing the contact between the resonance plate 5 and the electrode plates, and is convenient to produce larger contact area with the first electrode plate 2 and the second electrode plate 3, thereby generating larger current.
In the present embodiment, the first electrode plate 2, the second electrode plate 3, and the resonator plate 5 are all circular. The edge structure of the resonant plate is reduced, and the motion resistance is reduced.
In order to avoid that the internal structure of the shell moves towards other directions when detecting vibration and brings large errors to measurement to influence accuracy, the first electrode plate 2 and the second electrode plate 3 are fixedly connected with the inner wall of the shell 1, and the inner ring of the resonant plate 5 is attached to the outer surface of the fixed shaft 8.
In this embodiment, the first elastic member 6 and the second elastic member 7 are springs, and both springs are sleeved on the fixed shaft 8; the elastic element is arranged at one position to ensure that the resonance plate 5 can smoothly reciprocate, the area occupied by the elastic element is reduced, and more areas of the resonance plate 5 are in contact with the electrode plate. First electrode board 2 and second electrode board 3 all are provided with mounting groove 9, and fixed axle 8 and spring all pack into in mounting groove 9. When the resonant plate 5 compresses the springs, the compressed springs are all positioned in the mounting grooves 9, and the contact friction between the resonant plate 5 and the electrode plate is not influenced.
The working principle or working process of the invention is as follows: the self-powered sensor is arranged on an ocean riser, and the axis of the shell 1 is vertical to the axis of the riser. When the vertical pipe does not vibrate, the resonance plate 5 does not vibrate, and the resonance plate 5 and the electrodes do not contact to generate induced charges; when the vertical pipe vibrates, the shell vibrates along with the vertical pipe, the resonance plate compresses the first elastic part or the second elastic part due to inertia to move in the shell, and when the vibration amplitude reaches the set amplitude, the resonance plate 5 is in contact with the electrode plate. When the resonator plate 5 is in contact with the second electrode plate 3, all positive charges will be attracted to the second electrode plate 3, as shown in fig. 2; then when the resonant plate 5 with negative electricity moves towards the first electrode plate 2, the current moves from the second electrode plate 3 to the first electrode plate 2 through an external load circuit to generate an instantaneous current; when the resonator plate 5 is in contact with the first electrode plate 2, all positive charges will be present on the first electrode plate 2; the electronic reverse motion will be driven by the reverse motion of the resonator plate 5 immediately, until the resonator plate 5 has returned to the initial position and a complete resonance period has ended.
The resonant plate 5 moves between the first electrode plate 2 and the second electrode plate 3, and generates currents of different flow directions, so that an external detection circuit detects a resonant electric signal. Due to the resonance principle, the vibration amplitude of the resonance plate 5 reflects the vibration amplitude of the riser, and meanwhile, different electric signals can be generated due to the difference of the vibration amplitudes of the resonance plate 5, so that the amplitude condition of the marine riser can be calculated according to the difference of the electric signals.
The invention has the beneficial effects that: the actual amplitude of the measured vertical pipe is calculated by using a voltage value obtained by friction power generation of the resonance plate 5 and the electrode plate, so that the vibration of the vertical pipe can be detected in time; and an auxiliary power supply is not required to be carried, so that the number of components of the sensor is reduced, the size and the weight of the sensor are reduced, and the influence on the stability of the vertical pipe is avoided.
Example 2
Referring to fig. 3, another embodiment of a self-powered sensor for monitoring marine riser vibration is shown, and the present embodiment further defines the first electrode plate 2, the second electrode plate 3 and the resonator plate 5 based on the embodiment 1.
The first electrode plate 2, the second electrode plate 3 and the resonator plate 5 are all plastic plates (specifically, acrylic plates), and the plastic plates are made of lighter materials, so that the weight of the whole sensor is reduced, and the burden on the vertical pipe is reduced; electrode films 10 are arranged on one sides of the first electrode plate 2 and the second electrode plate 3 close to the resonance plate 5; dielectric films 4 are respectively provided on the surfaces of the resonator plates 5 adjacent to the first electrode plate 2 and the second electrode plate 3. The electrode film 10 and the dielectric film 4 are laid on the plastic plate, so that the resonance plate 5 can generate electric charges by friction when contacting the first electrode plate 2 or the second electrode plate, and can generate current when being separated.
The material of the electrode thin film 10 and the dielectric thin film 4 is further limited, the material of the electrode thin film 10 is any one of a metal material, an insulating material or a semiconductor material, in this embodiment, the electrode thin film 10 is a copper film; the material of the dielectric film 4 is different from that of the electrode film 10, and in this embodiment, the material of the dielectric film 4 is teflon. The electrode thin film 10 and the dielectric thin film 4 can generate positive and negative charges respectively due to different materials.
In order to improve the power generation efficiency and the power generation capacity of the electrode thin film 10 and the dielectric thin film 4, nano or sub-nano microstructures are distributed on the surfaces of the electrode thin film 10 and the dielectric thin film 4, and the areas of the electrode thin film 10 and the dielectric thin film 4 are equal.
The remaining features and working principle of this embodiment are consistent with embodiment 1.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A self-powered sensor for monitoring the vibration of a marine riser comprises a shell (1), and is characterized in that a first electrode plate (2) and a second electrode plate (3) are arranged on two opposite sides in the shell (1); a resonance plate (5) with a dielectric film (4) on the surface is arranged between the first electrode plate (2) and the second electrode plate (3); the resonance plate (5) is connected with the first electrode plate (2) through a first elastic piece (6), and the resonance plate (5) is connected with the second electrode plate (3) through a second elastic piece (7); the resonator plate (5) is movable within the housing (1) by compressing the first elastic element (6) or the second elastic element (7).
2. A self-powered sensor for monitoring marine riser vibrations as claimed in claim 1, wherein a fixed shaft (8) passing through the resonator plate (5) is further arranged between the first electrode plate (2) and the second electrode plate (3), both ends of the fixed shaft (8) are connected to the first electrode plate (2) and the second electrode plate (3), respectively, and the resonator plate (5) moves along the fixed shaft (8).
3. A self-powered sensor for monitoring marine riser vibrations according to claim 2, characterised in that the axial centres of the first electrode plate (2), the second electrode plate (3), the resonator plate (5) and the stationary shaft (8) are all on the same line.
4. A self-powered sensor for monitoring marine riser vibrations according to claim 2, characterised in that the first electrode plate (2) and the second electrode plate (3) are fixedly connected to the inner wall of the housing (1); the inner ring of the resonance plate (5) is attached to the outer surface of the fixed shaft (8).
5. A self-powered sensor for monitoring marine riser vibrations according to claim 2, characterised in that the first (6) and second (7) resilient members are springs and that the first (6) or second (7) resilient member is fitted over the stationary shaft (8); first electrode board (2) with second electrode board (3) all are provided with mounting groove (9), fixed axle (8) with the spring all packs into in mounting groove (9).
6. A self-powered sensor for monitoring marine riser vibrations according to any of claims 1-5, characterised in that the first electrode plate (2), the second electrode plate (3) and the resonator plate (5) are all plastic plates; electrode films (10) are arranged on one sides, close to the resonance plate (5), of the first electrode plate (2) and the second electrode plate (3); the dielectric films (4) are respectively arranged on the surface of the resonance plate (5) close to the first electrode plate (2) and the surface of the resonance plate close to the second electrode plate (3).
7. A self-powered sensor for monitoring marine riser vibration according to claim 6, wherein the electrode membrane (10) is made of any one of a metal material, an insulating material or a semiconductor material; the dielectric film (4) and the electrode film (10) are made of different materials.
8. A self-powered sensor for monitoring marine riser vibrations as claimed in claim 7, characterised in that the electrode membrane (10) is of copper and the dielectric membrane (4) is of polytetrafluoroethylene.
9. A self-powered sensor for monitoring marine riser vibrations according to claim 7, characterised in that the surface of the electrode membrane (10) and the dielectric membrane (4) is distributed with microstructures on the order of nanometers or sub-nanometers.
10. A self-powered sensor for monitoring marine riser vibrations according to claim 6, characterised in that the electrode membrane (10) and the dielectric membrane (4) are of equal area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010533276.1A CN111486940A (en) | 2020-06-12 | 2020-06-12 | Self-powered sensor for monitoring vibration of marine riser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010533276.1A CN111486940A (en) | 2020-06-12 | 2020-06-12 | Self-powered sensor for monitoring vibration of marine riser |
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| CN111486940A true CN111486940A (en) | 2020-08-04 |
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| CN202010533276.1A Pending CN111486940A (en) | 2020-06-12 | 2020-06-12 | Self-powered sensor for monitoring vibration of marine riser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039365A (en) * | 2020-08-20 | 2020-12-04 | 合肥工业大学 | Vibration energy collecting device based on liquid metal and application thereof |
| CN112924014A (en) * | 2021-01-29 | 2021-06-08 | 中国地质大学（武汉） | Self-powered downhole drilling tool vibration sensor based on friction nanometer generator |
| CN114608698A (en) * | 2022-03-15 | 2022-06-10 | 广东海洋大学 | Self-driven vibration sensor based on friction nano generator |
-
2020
- 2020-06-12 CN CN202010533276.1A patent/CN111486940A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039365A (en) * | 2020-08-20 | 2020-12-04 | 合肥工业大学 | Vibration energy collecting device based on liquid metal and application thereof |
| CN112039365B (en) * | 2020-08-20 | 2021-08-13 | 合肥工业大学 | Vibration energy collector and application thereof |
| CN112924014A (en) * | 2021-01-29 | 2021-06-08 | 中国地质大学（武汉） | Self-powered downhole drilling tool vibration sensor based on friction nanometer generator |
| CN114608698A (en) * | 2022-03-15 | 2022-06-10 | 广东海洋大学 | Self-driven vibration sensor based on friction nano generator |
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