CN110646032A - Water flow measuring device driven by piezoelectric motor - Google Patents
Water flow measuring device driven by piezoelectric motor Download PDFInfo
- Publication number
- CN110646032A CN110646032A CN201910827863.9A CN201910827863A CN110646032A CN 110646032 A CN110646032 A CN 110646032A CN 201910827863 A CN201910827863 A CN 201910827863A CN 110646032 A CN110646032 A CN 110646032A
- Authority
- CN
- China
- Prior art keywords
- water flow
- measuring device
- sensor
- base
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 239000002033 PVDF binder Substances 0.000 claims abstract description 33
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 6
- 238000004146 energy storage Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 19
- 238000012545 processing Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002520 smart material Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/14—Drive circuits; Control arrangements or methods
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a water flow measuring device driven by a piezoelectric motor, which comprises: the device comprises a shell, a telescopic body, a base, a folding body, a PVDF piezoelectric film sensor, a water level sensor, a temperature sensor, a piezoelectric motor and a control device, wherein the shell is hollow inside, the telescopic body can be stretched in the shell, the base is used for fixing the top end of the telescopic body, the folding body is rotatably arranged on the base, the PVDF piezoelectric film sensor, the water level sensor and the temperature sensor are arranged on the folding body, and the; the PVDF piezoelectric film sensor generates a voltage signal through pressure applied by water flow, transmits the voltage signal to the data acquisition processor through a data transmission line, and displays the voltage signal in real time; and voltage signals of the PVDF piezoelectric film sensor provide power for the piezoelectric motor through the energy storage capacitor. According to the invention, the piezoelectric effect of the piezoelectric intelligent material is utilized to realize the measurement of the flow velocity information of the water flow and the driving of the measuring device to move in the water flow, so that the mobile measurement of the water flow information is realized, and the real-time monitoring of the water level and the water flow velocity of the river channel is realized, thereby enabling the water conservancy monitoring work to be better carried out.
Description
Technical Field
The invention relates to the field of water flow detection, in particular to a water flow measuring device driven by a piezoelectric motor.
Background
Currently, the smart materials are mainly piezoelectric materials, shape memory alloys, electromagnetic stretch materials, electromagnetic rheological materials, and the like, wherein the piezoelectric materials are the most widely used smart materials and are increasingly used in the fields of aerospace, aviation, national defense, automobiles, civil engineering and construction, and the like. Piezoelectric materials can be used not only in sensors, but also in actuators. Specifically, the piezoelectric material is used as a strain sensor due to the positive piezoelectric effect, so that the self-sensing of the intelligent material structure is realized, and the piezoelectric material is mainly used for measuring the external force applied to the piezoelectric body; the inverse piezoelectric effect utilizes the active action of the piezoelectric driving element to realize the self-adjustment of the intelligent material structure.
The piezoelectric motor is a motor for performing electromechanical energy conversion by utilizing the inverse piezoelectric effect of a piezoelectric body, has the characteristics of compact structure, easiness in miniaturization, low processing cost, simplicity in modal excitation, high energy density and the like, and is particularly suitable for the fields of precision driving, underwater detection, semiconductor industry and the like.
Current velocity of flow detection device usually adopts the fixed mode measurement rivers velocity of flow of measuring staff, consequently, can only measure the velocity of flow parameter of fixed point usually, simultaneously, current velocity of flow detection device of rivers adopts floated or when fixed more, all does not possess the power device that removes in the aquatic to fixed velocity of flow detection device of rivers can not reduce rivers when using and to the impact force of measuring staff, is difficult to provide effectual protection to it, can not prolong the life of measuring staff. In addition, current water flow rate devices cannot simultaneously measure information such as water temperature and depth of a corresponding water area.
Therefore, those skilled in the art have made an effort to develop a piezoelectric motor driven water flow measuring device, which dynamically measures the water flow rate under the driving of a piezoelectric motor, and at the same time integrates a water level sensor and a temperature sensor, thereby not only being capable of movably measuring the water flow rate parameter, but also providing the depth and temperature of the measuring point.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to a method for driving and supplying a measuring device underwater, measuring a plurality of parameters such as flow rate, water level and temperature of a water area, and prolonging the service life of the measuring device.
In order to achieve the above object, the present invention provides a water flow measuring device driven by a piezoelectric motor, comprising:
a housing, the housing being hollow inside;
a telescopic body slidably mounted on the housing, extending from within the housing to outside the housing or retracting from outside the housing to outside the housing;
the base is fixed at the top end of the telescopic body;
one end of the folding body is rotatably arranged on the base and can be unfolded or folded along the base;
the sensor module comprises a PVDF piezoelectric film sensor, a water level sensor and a temperature sensor;
the PVDF piezoelectric film sensor is coated on the folding body, and the water level sensor and the temperature sensor are arranged on the folding body;
the piezoelectric motor is arranged in the base and used for driving the measuring device;
the control device is arranged in the base and used for controlling the piezoelectric motor;
the data transmission line is connected with the data acquisition processor and is used for transmitting the data acquired by the sensor module in real time;
and the control device is provided with an energy storage capacitor, and the energy storage capacitor stores electric energy generated by the PVDF piezoelectric film sensor and is used for driving the piezoelectric motor.
Further, the bottom end of the telescopic body is fixed on the connecting block, a driver is installed in the connecting block, and the driver drives the connecting block to slide along the inner wall of the shell.
Further, when the measuring device does not perform measurement, the telescopic body retracts into the shell, the base is located on the surface of the shell, and the folding body is folded; when the measuring device measures, the telescopic body extends out of the shell, and the folding body is unfolded.
Further, the number of the folded bodies is 3.
Further, the three folding bodies are positioned on the same plane after being unfolded.
Further, the folded body is coated with the PVDF piezoelectric film sensor at equal intervals.
Further, the driver is a piezoelectric motor.
Furthermore, the data acquisition processor is arranged outside the water flow and connected with a display device, and the display device displays the data of the water flow in real time.
Further, the PVDF piezoelectric film sensor is connected with the data transmission line through a charge amplifier.
Further, the PVDF piezoelectric film sensor is coated on the telescopic body.
According to the piezoelectric motor driven water flow measuring device, the positive piezoelectric effect and the inverse piezoelectric effect of the piezoelectric intelligent material are utilized, so that the flow velocity information of water flow can be measured, the measuring precision is improved, the measuring device can be driven to move in the water flow, and the water flow information can be measured in a moving mode. Simultaneously, water level sensor and temperature sensor are integrated on the device, have realized carrying out real-time supervision to river course water level, velocity of water flow to make water conservancy monitoring work go on better. In addition, when the measuring device is not required to be measured, all parts are folded, so that obstacles such as weeds can be effectively prevented from being attached to the measuring device, the measuring stability is improved, and the service life is prolonged.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic unfolded configuration of a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the preferred embodiment of the present invention shown in the closed position;
fig. 3 is a schematic structural diagram of a control device according to a preferred embodiment of the invention.
The device comprises a water flow measuring device 1, a shell 2, a telescopic body 3, a base 4, a folding body 5, a PVDF piezoelectric film sensor 51, a connecting block 6, a data transmission line 7, a main control module 81, a voltage storage module 82, a motor control module 83 and a signal processing unit 84.
Detailed Description
A preferred embodiment of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of the technical contents thereof. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
As shown in fig. 1, a piezoelectric motor driven water flow measuring device 1 in the embodiment of the present invention includes a housing 2, a telescopic body 3, a base 4, and a folding body 5. The inside cavity of casing 2, the bottom of the flexible body 3 is installed on casing 2, and base 4 is fixed on the top of flexible body 3, and the one end of the folding body 5 is installed on base 4.
The telescopic body 3 is slidable along the housing 2 so as to be retractable inside the housing 2 or extendable from inside the housing 2. Specifically, be fixed with connecting block 6 at the bottom of the flexible body 3, connecting block 6 and the cooperation of 2 inner walls of casing slide along 2 inner walls of casing to drive flexible body 3 indentation or stretch out. The inside of the connecting block 6 is provided with a driver, such as a piezoelectric linear motor, for driving the telescopic body 3 to move.
One end of the folder 5 is mounted on the base 4 and can rotate around the base 4, thereby completing the unfolded or folded state.
As shown in fig. 2, when the water flow measuring device 1 in this embodiment does not perform detection, the water flow measuring device 1 can be folded, specifically, the telescopic body 3 is retracted into the housing 2, the base 4 moves along with the telescopic body 3 and stays on the surface of the housing 2, and the folding body 5 rotates around its fixed shaft on the base 4, so as to be folded and attached to or close to the side of the housing 2. When the water flow measuring device 1 does not measure, the whole device is folded, so that obstacles such as weeds and the like can be effectively prevented from being attached to the water flow measuring device 1, and the measuring stability of the device is improved. The housing 2 may be cylindrical or spherical, preferably cylindrical in this embodiment.
The water flow measuring device 1 further comprises piezoelectric motors driving the device to move in different directions, a control device for controlling the piezoelectric motors, a sensor module for acquiring water flow data and a data transmission line 7 for data transmission and communication with an acquired data processor on the ground or on a ship.
The sensor module is used for collecting data such as flow rate, water level, temperature and the like of water flow and comprises a flow rate sensor, a water level sensor and a temperature sensor. Among them, the flow rate sensor employs a PVDF piezoelectric film sensor 51, the PVDF piezoelectric film sensor 51 is coated on the folding body 5, and a water level sensor (not shown) and a temperature sensor (not shown) are provided on the folding body 5.
In order to improve the measuring effect, 3 folding bodies 5 can be arranged, three folding bodies 5 are arranged on the same plane after being unfolded, and the water flow measuring device 1 is controlled to deflect when measuring, so that the plane is positioned on the water flow section. The PVDF piezoelectric film sensor 51 on the folding body 5 can measure the pressure of the flowing water on the upstream surface of the folding body, and then converts the pressure into the flow rate of the flowing water.
The relationship between the voltage between the two plates of the PVDF piezoelectric film sensor 51 and the flow rate of the river caused by the action of the water flow pressure can be expressed as follows:
where U is the converted voltage value, d33Is the piezoelectric strain constant,. epsilon0Is a vacuum dielectric constant, ∈rIs the relative dielectric constant of the PVDF piezoelectric thin film sensor 51, t is the thickness of the PVDF piezoelectric thin film sensor 51, and δ is the volume weight of water, typically 10KN/m3G is the acceleration of gravity and v is the flow rate of the water flow. PVDF piezoelectric thin film sensor 51The value of the voltage collected is proportional to its thickness t and inversely proportional to the square of the water flow velocity v.
According to the acquired voltage value, temperature, water level and other water body conditions of the PVDF piezoelectric film sensor 51, the flow velocity of the water area is converted and detected in real time according to the measured voltage value, the temperature and water level information is used for providing auxiliary information of a measuring point, and test data is provided for the subsequent drawing of the relationship among the flow velocity, the temperature and the water level of the basin.
Piezoelectric motors (not shown) are used to drive the water flow testing device 1 to move in different directions, and the PVDF piezoelectric film sensor 51 supplies energy. Specifically, the PVDF piezoelectric film sensor 51 is connected to a rectifying and filtering circuit, and the rectifying and filtering circuit converts the signal into a dc signal, and then the dc signal is stored by a super capacitor, and the stored electric signal is used as a power supply for driving the piezoelectric motor.
As shown in fig. 3, the control device is used for controlling the piezoelectric motor and transmitting the collected data, and includes a main control module 81, a voltage storage module 82, a motor control module 83, and a signal processing unit 84. The main control module 81 is respectively connected with the motor control module 83 and the signal processing unit 84, the motor control module 83 is connected with the voltage storage module 82, the signal processing unit 84 is connected with the sensor module, and the main control module can be expanded according to actual requirements and comprises a flow rate signal processing module, a water level signal processing module, a temperature signal processing module and the like. The signal processing unit 84 transmits the processed data to the acquisition data processor through the data transmission line 7. The main control module 81 adopts a single chip microcomputer.
The piezoelectric motor and the control device for controlling the water flow testing device 1 to move are both arranged in the base 4.
Because the PVDF piezoelectric film sensor 51 has a small amount of electric charge generated by the water flow pressure, the electric signal is weak, and the PVDF piezoelectric film sensor itself needs a very high insulation resistance, for this reason, a pre-charge amplifier is configured in the present embodiment to amplify the voltage output by the PVDF piezoelectric film sensor 51, and preferably, the pre-charge amplifier is AD 8067. The voltage output by the PVDF piezoelectric film sensor 51 amplified by the amplifier is:
wherein, C0Is the intrinsic capacitance, C, of the PVDF piezoelectric thin-film sensor 51fIs the feedback resistance connected to AD 8067.
The acquisition data processor is arranged on the shore or on the ship and is not in the water flow. The collected water flow data is received through a data transmission line 7. The data acquisition processor is connected with the display device and displays the measurement result in real time. The display device is preferably an LED screen.
The working principle of the water flow testing device 1 of the embodiment is as follows: when an unknown water area is measured, the water flow testing device 1 is thrown into the water area, when the water flow testing device 1 enters the water stably, the folding body 5 is unfolded, the telescopic body 3 extends out of the shell 2, and the base 4 is pushed to leave the shell 2; water level, flow rate and temperature information are detected by the PVDF piezoelectric film sensor 51, the water level sensor and the temperature sensor; meanwhile, a data transmission line 7 is arranged at the tail of the shell 2, acquired data are transmitted to an acquired data processor outside water flow in real time, and measured temperature, water level and flow rate values are displayed in real time through an LED screen.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A piezoelectric motor driven water flow measuring device, comprising:
a housing, the housing being hollow inside;
a telescopic body slidably mounted on the housing, extending from within the housing to outside the housing or retracting from outside the housing to outside the housing;
the base is fixed at the top end of the telescopic body;
one end of the folding body is rotatably arranged on the base and can be unfolded or folded along the base;
the sensor module comprises a PVDF piezoelectric film sensor, a water level sensor and a temperature sensor;
the PVDF piezoelectric film sensor is coated on the folding body, and the water level sensor and the temperature sensor are arranged on the folding body;
the piezoelectric motor is arranged in the base and used for driving the measuring device;
the control device is arranged in the base and used for controlling the piezoelectric motor;
the data transmission line is connected with the data acquisition processor and is used for transmitting the data acquired by the sensor module in real time;
and the control device is provided with an energy storage capacitor, and the energy storage capacitor stores electric energy generated by the PVDF piezoelectric film sensor and is used for driving the piezoelectric motor.
2. The water flow rate measuring device of claim 1, wherein the bottom end of the telescopic body is fixed to a connecting block, and a driver is installed in the connecting block and drives the connecting block to slide along the inner wall of the housing.
3. The device for measuring the flow rate of water flow of claim 1, wherein when the measuring device is not measuring, the telescopic body is retracted into the shell, the base is positioned on the surface of the shell, and the foldable body is folded; when the measuring device measures, the telescopic body extends out of the shell, and the folding body is unfolded.
4. The water flow rate measuring device of claim 1, wherein the number of said folded bodies is 3.
5. The water flow velocity measuring device of claim 4, wherein three of said folded bodies are located in the same plane after being unfolded.
6. The water flow rate measuring device of claim 1, wherein said pleated body is coated with said PVDF piezoelectric film sensor at equal intervals.
7. The water flow rate measuring device of claim 2, wherein the actuator is a piezoelectric motor.
8. The water flow rate measuring device according to claim 1, wherein the data acquisition processor is disposed outside the water flow, and the data acquisition processor is connected to a display device, and the display device displays the data of the water flow in real time.
9. The water flow rate measuring device of claim 1, wherein the PVDF piezoelectric film sensor is connected to the data transmission line via a charge amplifier.
10. The system of claim 1, wherein said PVDF piezoelectric film sensor is coated on said telescopic body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910827863.9A CN110646032B (en) | 2019-09-03 | 2019-09-03 | Water flow measuring device driven by piezoelectric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910827863.9A CN110646032B (en) | 2019-09-03 | 2019-09-03 | Water flow measuring device driven by piezoelectric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110646032A true CN110646032A (en) | 2020-01-03 |
| CN110646032B CN110646032B (en) | 2020-11-13 |
Family
ID=69010054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910827863.9A Expired - Fee Related CN110646032B (en) | 2019-09-03 | 2019-09-03 | Water flow measuring device driven by piezoelectric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110646032B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114634242A (en) * | 2022-03-29 | 2022-06-17 | 河海大学 | Water pollutant degradation aeration integrated device based on piezoelectric catalysis |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11142197A (en) * | 1997-11-11 | 1999-05-28 | Saginomiya Seisakusho Inc | Fluid detecting sensor |
| CN104198756A (en) * | 2014-08-28 | 2014-12-10 | 华中科技大学 | Piezoelectric and photoelectric composite fluid flowing speed and flowing direction measurement device and method |
| CN204214888U (en) * | 2014-11-27 | 2015-03-18 | 东北林业大学 | The multi-functional flow rate measuring device of a kind of wireless online based on PVDF |
| US20170248458A1 (en) * | 2016-02-29 | 2017-08-31 | Mueller International, Llc | Flow sensor |
| CN107561308A (en) * | 2017-08-17 | 2018-01-09 | 浙江师范大学 | A kind of piezoelectricity wind direction and wind velocity measurement apparatus |
| CN108459176A (en) * | 2018-04-12 | 2018-08-28 | 常州机电职业技术学院 | Piezoelectric energy collection structure based on wind induced vibration and self-powered wind speed measurement device and method |
| CN109856420A (en) * | 2019-01-17 | 2019-06-07 | 江苏大学 | A kind of flow velocity method for automatic measurement of the blade water pump outlet pipe based on stepper motor |
-
2019
- 2019-09-03 CN CN201910827863.9A patent/CN110646032B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11142197A (en) * | 1997-11-11 | 1999-05-28 | Saginomiya Seisakusho Inc | Fluid detecting sensor |
| CN104198756A (en) * | 2014-08-28 | 2014-12-10 | 华中科技大学 | Piezoelectric and photoelectric composite fluid flowing speed and flowing direction measurement device and method |
| CN204214888U (en) * | 2014-11-27 | 2015-03-18 | 东北林业大学 | The multi-functional flow rate measuring device of a kind of wireless online based on PVDF |
| US20170248458A1 (en) * | 2016-02-29 | 2017-08-31 | Mueller International, Llc | Flow sensor |
| CN107561308A (en) * | 2017-08-17 | 2018-01-09 | 浙江师范大学 | A kind of piezoelectricity wind direction and wind velocity measurement apparatus |
| CN108459176A (en) * | 2018-04-12 | 2018-08-28 | 常州机电职业技术学院 | Piezoelectric energy collection structure based on wind induced vibration and self-powered wind speed measurement device and method |
| CN109856420A (en) * | 2019-01-17 | 2019-06-07 | 江苏大学 | A kind of flow velocity method for automatic measurement of the blade water pump outlet pipe based on stepper motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114634242A (en) * | 2022-03-29 | 2022-06-17 | 河海大学 | Water pollutant degradation aeration integrated device based on piezoelectric catalysis |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110646032B (en) | 2020-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Erturk et al. | Underwater thrust and power generation using flexible piezoelectric composites: an experimental investigation toward self-powered swimmer-sensor platforms | |
| CN110646032B (en) | Water flow measuring device driven by piezoelectric motor | |
| CN103760604B (en) | Circuit module for dragging multi-linear-array horizontal control device | |
| CA3013934C (en) | Weather sensor including vertically stacked multi-power modules | |
| CN202599971U (en) | Liquid flow rate measuring device based on resistance strain gage | |
| US4355280A (en) | Accumulator condition indicator with spring biasing to indicate linear displacement of a piston | |
| CN104677466B (en) | Underwater robot compensator displacement detecting sensor and its detection method | |
| CN107329004A (en) | A kind of contactless MEMS autoexcitations stilling the theatre electrical resistivity survey examining system and its detection method based on electrostatic induction principle | |
| CN202329895U (en) | Power diagram measurement device of pumping unit in oil field | |
| Abrol et al. | Experimental investigations of piezoelectric energy harvesting with turbulent flow | |
| CN102809423A (en) | On-orbit satellite micro-vibration measurement system | |
| CN105807085A (en) | Bearing rotation measuring device based on piezoelectric properties and electrostatic induction | |
| CA1088646A (en) | Measurement of force/velocity characteristic | |
| CN104121981A (en) | Remote wireless vibration monitoring device applied to offshore jacket ocean platform | |
| CN208568956U (en) | A kind of exciting bank of the electric power pylon detection based on electromagnet | |
| CN207991994U (en) | Rheological behavior in-situ measurement device after a kind of liquefaction of bottom sediment | |
| CN217359949U (en) | Ocean current velocity of flow monitoring devices | |
| CN203249932U (en) | Device acquiring rotation speed of drive peristaltic pump direct current motor | |
| CN108362611A (en) | Rheological behavior in-situ measurement device after a kind of liquefaction of bottom sediment | |
| CN203772890U (en) | Hand-held hollow flow meter | |
| CN205122038U (en) | Experimental apparatus of flapping wing motion under water | |
| CN109358346A (en) | A kind of service robot autonomous navigation chassis system | |
| CN111880246A (en) | Piezoelectric rain gauge applicable to railway meteorological measurement | |
| CN203084008U (en) | Anti-interference quartz flexible acceleration sensor | |
| Suhag et al. | Design of a closed channel fluid flow system for piezoelectric energy harvsting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201113 |