CN115452237A - Novel pipeline liquid pressure testing method and device - Google Patents
Novel pipeline liquid pressure testing method and device Download PDFInfo
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- CN115452237A CN115452237A CN202211128396.9A CN202211128396A CN115452237A CN 115452237 A CN115452237 A CN 115452237A CN 202211128396 A CN202211128396 A CN 202211128396A CN 115452237 A CN115452237 A CN 115452237A
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of pipeline conveying, and particularly relates to a novel pipeline liquid pressure testing method and device. The testing device comprises a liquid pressure sensor, a microprocessor and a display module; the liquid pressure sensor includes: the sensor comprises a sensing electrode, a reference electrode and a signal processing module, wherein the sensing electrode, the reference electrode and the signal processing module are formed by metal and oxides thereof; the signal processing module filters and amplifies the obtained voltage signal, and converts the voltage value through the A/D acquisition module; the microprocessor is integrated with a pressure prediction model and is used for converting the voltage value into a liquid pressure value; and the display module acquires and displays the liquid pressure value or/and the voltage value. The device has the characteristics of high sensitivity, simple structure, low cost and energy conservation; the method is suitable for continuous liquid pressure monitoring under static and dynamic conditions.
Description
Technical Field
The invention belongs to the technical field of pipeline transportation, and particularly relates to a novel pipeline liquid pressure testing method and device; the method is applied to the fields of medical diagnosis, chemical production, deep sea pipeline transportation, petroleum transportation and the like.
Background
Pipeline liquid pressure measurement is of great importance in the fields of medical diagnosis, chemical production, deep sea pipeline transportation, petroleum transportation and the like; furthermore, the density, viscosity, level and other parameters of the liquid in the container are mostly measured by a liquid pressure sensor.
The traditional hydrostatic-based liquid column pressure gauges, which are usually composed of glass tubes with scales, require manpower to read data on site, and are only suitable for low liquid pressure measurement in a conventional environment. With the progress of technology, liquid pressure measurement methods based on various piezoelectric, piezoresistive and capacitive sensors are gradually developed. The pressure measuring method is mainly used for measuring the pressure of liquid in various closed pipelines and containers at present. However, long-term monitoring in some extreme liquid environments with high temperature, high pressure and high corrosion requires a tightly designed protective housing, which greatly affects the sensitivity, response time and the like of the sensor. Meanwhile, the piezoelectric pressure sensor cannot measure static pressure; the capacitive pressure sensor is difficult to miniaturize because of the large structural volume. In addition to the above methods, some new liquid pressure measurement methods based on optical fiber, ultrasonic and visual sensors have been developed rapidly, but these methods have not been well applied due to the requirements of measurement accuracy, service life, pipeline installation requirements, and equipment complexity.
Disclosure of Invention
In order to solve the technical problem, the invention is based on the principle of a solid-liquid interface double electric layer, and is provided with a sensing electrode, under the condition of different pressures, the formed double electric layers have different thicknesses, and the electric potentials on the surfaces of the electrodes are different, so that the pressure measurement of the liquid in the pipeline under different states is realized.
In order to achieve the above object, an embodiment of the present invention provides a novel pipeline liquid pressure testing apparatus, where the testing apparatus includes a liquid pressure sensor, a microprocessor, and a display module;
the liquid pressure sensor includes: the sensor comprises a sensing electrode, a reference electrode and a signal processing module, wherein the sensing electrode, the reference electrode and the signal processing module are formed by metal and oxides thereof; one end of the sensing electrode is in contact with the liquid, and the other end of the sensing electrode is connected with a lead to lead out a voltage signal and is fixed on the pipeline; the signal processing module filters and amplifies the obtained voltage signal, and converts the voltage value through the A/D acquisition module;
the microprocessor is integrated with a pressure prediction model and is used for converting the voltage value into a liquid pressure value;
and the display module acquires and displays the liquid pressure value or/and the voltage value.
Further, the metal in the sensing electrode made of the metal and the oxide thereof is any one of tungsten, tantalum, molybdenum, titanium, niobium or platinum. Further, the reference electrode is an electrode capable of providing a stable potential in the liquid, and comprises a saturated Ag/AgCl electrode, a calomel electrode or a SiC electrode and the like.
Further, the signal processing circuit comprises a voltage following circuit, a filtering circuit and an amplifying circuit.
Based on the same inventive concept, the embodiment of the invention also provides a novel pipeline liquid pressure testing method, which specifically comprises the following steps:
s1, installing a liquid pressure sensor on the inner surface of a simulation pipeline, and measuring voltage values in different states by adjusting the state of liquid in the simulation pipeline;
s2, measuring the liquid pressure values in different states in the step S1 by adopting a high-precision resistance type pressure sensor;
s3, performing linear fitting according to the liquid pressure values in different states and the corresponding voltage values to obtain corresponding pressure prediction models;
and S4, integrating the pressure prediction model into a microprocessor, mounting a liquid pressure sensor on the inner surface of the pipeline to be measured during measurement, connecting the microprocessor and a display module, measuring a voltage value, and reading the liquid pressure of the pipeline to be measured.
Further, the different states in step S2 specifically include: different liquid media, liquid static, liquid dynamic at different flow rates.
Further, the step of mounting the liquid pressure sensor on the inner surface of the pipe specifically includes:
will hydraulic sensor's sensing electrode one end is direct and liquid contact, and the sensing electrode other end links to each other with the wire and draws forth the signal of telecommunication, and intermediate junction sets up the waterproof interface of insulating seal, the pressure conduit is passed and is fixed on the pipeline during the sensing electrode installation, and the intermediate junction position sets up sealed interface, specifically through waterproof hickey, glue the mode of sealing.
Has the beneficial effects that:
the method and the device for measuring the pressure of the pipeline liquid based on the principle of the solid-liquid interface double electric layers have the characteristics of high sensitivity, simple structure, low cost and energy conservation; the device is suitable for continuous liquid pressure monitoring under static and dynamic conditions; meanwhile, the sensing electrode is in direct contact with liquid to sense pressure, the response time is short, the linearity is good, the property is stable, the sensing electrode is not easy to damage in an all-solid state, and the sensing electrode can be placed in the liquid for long time to measure; the signal that liquid pressure sensor output is open circuit voltage value, and open circuit voltage value collection technique is comparatively ripe, and transmission distance is unrestricted, and measuring device is convenient for design and development towards intelligent direction.
Drawings
FIG. 1 is a schematic diagram of a device for measuring the liquid pressure in a pipeline based on a solid-liquid double electric layer hydraulic sensor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a solid-liquid double layer sensing electrode structure and installation in a pipe according to an embodiment of the present invention;
fig. 3 is a tap water static pressure response characteristic curve based on a tungsten/tungsten oxide liquid pressure sensor provided in embodiment 1 of the present invention;
fig. 4 is a dynamic pressure response characteristic curve of tap water based on a tungsten/tungsten oxide liquid pressure sensor provided in embodiment 2 of the present invention;
FIG. 5 is a 0.1mol/L KCL solution dynamic pressure response characteristic curve of a tungsten/tungsten oxide-based liquid pressure sensor provided in embodiment 3 of the present invention;
fig. 6 shows glycerin and purified water 1 of a tungsten/tungsten oxide-based liquid pressure sensor according to embodiment 4 of the present invention: 2, the dynamic pressure response characteristic curve of the mixed liquid;
the designations in the drawings are specifically:
1-1, a sensing electrode; 1-2, a reference electrode; 1-3, a signal processing module; 1-4, a microprocessor; 1-5, a liquid storage tank; 1-6, a peristaltic pump; 1-8, and a display module.
Detailed Description
In order to more clearly illustrate the technical content of the present invention, the detailed description is given herein with reference to specific examples and drawings, and it is obvious that the examples are only preferred embodiments of the technical solution, and other technical solutions that can be obviously derived by those skilled in the art from the technical content disclosed still belong to the protection scope of the present invention.
In the embodiment of the invention, a pipeline liquid pressure measuring device based on an MSP430F5438 microprocessor is provided, as shown in fig. 1, a sensing electrode 1-1 is in direct contact with liquid, electric double layers with the thickness of tens to hundreds of nanometers are formed on the surface, the liquid pressure is different, the thickness of the formed electric double layers is different, and therefore, the electric potential on the surface of the electrode is also different; the reference electrode 1-2 provides a reference potential, the potential of which does not change with changes in the liquid pressure; the voltage signal processing module 1-3 filters and amplifies an open-circuit voltage value between the sensing electrode 1-1 and the reference electrode 1-2, and converts a digital voltage value through the A/D acquisition module, and the microprocessor 1-4 is a microprocessor integrated with a pressure prediction model and used for converting the digital voltage value into a liquid pressure value; the display is performed in the display module 1-8. In order to carry out experimental verification on the pipeline liquid pressure measuring device, the hose is flatly laid on a horizontal desktop, two ends of the hose are respectively connected with the liquid storage tanks 1-5, and a liquid static-dynamic pressure testing environment is created in a mode that the hose is continuously extruded by the peristaltic pumps 1-6.
The sensing electrode is generally prepared by a chemical oxidation method and an electrochemical oxidation method, and in the embodiment of the invention, the preparation method of the sensing electrode comprises the following steps: the metal tungsten/tantalum/molybdenum electrode with the purity of more than 99.99 percent is added with H with the concentration of 0.1mol/L 2 SO 4 In the solution, electrochemical oxidation is carried out for 15-30 times by using cyclic voltammetry, the scanning voltage is 1-2-1V, and the scanning speed is 0.02-0.1V/s. The prepared metal oxide electrode is led out through a lead and connected to a back end circuit, and the joint of the electrode and the lead needs to be sealed to prevent water from contacting. The prepared sensing electrode is contacted with liquid, a double electric layer can be formed on the surface, the liquid pressure is different, the thickness of the formed double electric layer is different, and therefore, the electric potential of the electrode surface is different; the greater the liquid pressure, the thinner the electric double layer thickness, sensingThe smaller the electrode potential. The reference electrode comprises a saturated Ag/AgCl electrode, a calomel electrode, a SiC electrode and the like, and has constant potential in the liquid and is used for providing a reference potential.
Specific test methods are described in the following examples
Example 1
A tungsten/tungsten oxide electrode is used as a sensing electrode, the structure of the sensing electrode and the installation schematic diagram in a pipeline are shown in figure 2, one end of a sensitive material tungsten/tungsten oxide 2-1 is in direct contact with liquid, the other end of the sensitive material tungsten/tungsten oxide 2-1 is connected with a lead to lead out an electric signal, and the sensitive material tungsten/tungsten oxide 2-1 and the lead are subjected to insulation-waterproof packaging through a heat-shrinkable polytetrafluoroethylene sleeve 2-2. Meanwhile, the sensing electrode needs to penetrate through the pressure pipeline and be fixed on the surface of the pipeline when being installed, and the middle joint interface 2-3 is sealed and fixed in a glue sealing mode. If the liquid pressure is too large, a waterproof threaded interface with a fastened structure is needed. A saturated Ag/AgCl electrode was chosen as the reference electrode in this example.
As the integral device shown in figure 1, the pipeline is filled with tap water at 25 ℃, the pressure of a peristaltic pump is kept unchanged, liquid in the pipeline does not flow, different static pressures are provided by changing the arrangement positions 1-7 of the tungsten/tungsten oxide sensing electrodes, and the output voltages of the liquid pressure sensors under different static pressures are recorded and stored; the output voltages of the liquid pressure sensors at the five distribution positions shown in 1-7 are-0.3186, -0.3099, -0.2999, -0.2916 and-0.2838 (V) respectively.
The device was calibrated using a high precision resistive pressure sensor to determine pressure data at different static pressures. The static pressures (gauge pressure = absolute pressure-atmospheric pressure) corresponding to the respective position points are-3.10162, -3.02793, -2.97453, -2.9407, -2.90048 (kpa), respectively. The high-precision resistance type pressure sensor is an AE-S micro-pressure sensor of Nanjing Aier sensing, the measurement range is-30 kpa (gauge pressure), the measurement precision is 0.5%, and the measurement requirement is met.
Performing linear fitting on the obtained pressure data and voltage data to obtain a static pressure prediction model, wherein a characteristic curve is shown in fig. 3, and an equation specifically comprises the following steps:
y＝--1.42374+5.20823*x (1)
x is the output voltage (in V) of the tungsten/tungsten oxide based liquid pressure sensor and y is the liquid pressure value to be measured (in kpa).
The prediction model is integrated into a microprocessor, a liquid pressure sensor is installed on the inner surface of the static water pipeline to be measured, and the liquid pressure sensor is connected into the microprocessor and a display module to directly read a pressure value.
Example 2
A tungsten/tungsten oxide electrode is used as a sensing electrode, the structure of the sensing electrode and the installation schematic diagram in a pipeline are shown in figure 2, one end of a sensitive material tungsten/tungsten oxide 2-1 is in direct contact with liquid, the other end of the sensitive material tungsten/tungsten oxide 2-1 is connected with a lead to lead out an electric signal, and the sensitive material tungsten/tungsten oxide 2-1 and the lead are subjected to insulation-waterproof packaging through a heat-shrinkable polytetrafluoroethylene sleeve 2-2. Meanwhile, the sensing electrode needs to penetrate through the pressure pipeline and be fixed on the surface of the pipeline when being installed, and the middle joint interface 2-3 is sealed and fixed in a glue sealing mode. If the liquid pressure is too large, a waterproof threaded interface with a fastened structure is needed. A saturated Ag/AgCl electrode was chosen as the reference electrode in this example.
As the integral device shown in figure 1, the pipeline is filled with tap water at 25 ℃, the flow rate of the peristaltic pump is changed to be 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500 (mL/min) respectively, so as to provide different dynamic pressures, the output voltage of the liquid pressure sensor under different dynamic pressures is recorded and stored, and the output voltage of the liquid pressure sensor is at the moment of being-0.3029, -0.29313, -0.28286, -0.27462, -0.26506, -0.254, -0.2419, -0.23121, -0.22127, -0.2101 and-0.202 (V) respectively.
The device was calibrated using a high precision resistive pressure sensor and the corresponding dynamic pressures (gauge pressure = absolute pressure-atmospheric pressure) were measured as-3.00204, -2.9514, -2.90876, -2.84132, -2.77532, -2.72464, -2.65104, -2.6088, -2.56868, -2.52108, -2.48784 (kpa), respectively.
Performing linear fitting on the obtained pressure data and voltage data to obtain a dynamic pressure prediction model, wherein a characteristic curve is shown in fig. 4, and an equation specifically comprises:
y＝-1.40176+5.21187*x (2)
x is the output voltage (in V) of the tungsten/tungsten oxide based liquid pressure sensor and y is the liquid pressure value to be measured (in kpa).
Example 3
The structure of the sensing electrode and the schematic view of the installation of the sensing electrode in the pipe are the same as in embodiments 1 and 2. As shown in the experimental device of FIG. 1, the duct is filled with 0.1mol/L KCL solution, the flow rate of the peristaltic pump is changed to 0, 100, 200, 300, 400 and 500 (mL/min) respectively to provide different dynamic pressures, and the output voltage of the liquid pressure sensor under different dynamic pressures is recorded and stored, and the output voltage of the liquid pressure sensor is-0.25569, -0.25295, -0.25033, -0.24757, -0.245729 and-0.24189 (V) respectively.
The device was calibrated using a high precision resistive pressure sensor, and the corresponding pressures (gauge pressure = absolute pressure-atmospheric pressure) were measured as-2.77813, -2.70306, -2.65934, -2.61987, -2.57054 (kpa), respectively, in a 0.1mol/L KCL solution.
The obtained pressure data and voltage data are subjected to linear fitting to obtain a liquid pressure prediction model in a KCL solution of 0.1mol/L, a characteristic curve is shown in figure 5, and an equation is specifically as follows:
y＝1.90139+18.26337*x (3)
x is the output voltage (in V) of the tungsten/tungsten oxide based liquid pressure sensor and y is the liquid pressure value to be measured (in kpa).
Example 4
The structure of the sensing electrode and the schematic view of the installation of the sensing electrode in the pipe are the same as in examples 1, 2 and 3, with the tungsten/tungsten oxide electrode as the sensing electrode. As shown in fig. 1, the experimental apparatus is filled with glycerin and purified water 1:2, changing the flow rate of the peristaltic pump to be 0, 100, 200, 300, 400 and 500 (mL/min) respectively to provide different dynamic pressures, recording and storing the output voltages of the liquid pressure sensors under the different dynamic pressures, wherein the output voltages of the liquid pressure sensors are-0.19452, 0.06512, 0.32367, 0.55784, 0.78594 and 0.95015 (V) respectively.
The device was calibrated using a high precision resistive pressure sensor, in glycerol with purified water 1:2 in the mixed solution, the corresponding pressures were measured to be-2.86187, -2.7837, -2.73995, -2.69791, -2.64803, -2.61302 (kpa), respectively.
Performing linear fitting on the obtained pressure data and voltage data to obtain a liquid pressure prediction model in the mixed solution of glycerol and purified water in a ratio of 1:2, wherein a characteristic curve is shown in figure 6, and an equation is as follows:
y＝-2.8150+0.2143*x (4)
x is the output voltage (in V) of the tungsten/tungsten oxide based liquid pressure sensor and y is the liquid pressure value to be measured (in kpa). It can be seen from the above embodiments that the tungsten/tungsten oxide liquid pressure sensor is in the same liquid, and the static and dynamic pressure prediction models thereof exhibit consistency; in different liquids, the pressure prediction models are different and linear. The different prediction models are integrated into a microprocessor, the liquid pressure sensor is installed on the inner surface of the dynamic water pipeline to be measured, the microprocessor and a display module are connected, and the pressure value is directly read.
The above-mentioned embodiments are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical scope of the present invention, and equivalents and modifications of the technical solutions and concepts of the present invention should be covered by the scope of the present invention.
Claims (6)
1. The novel pipeline liquid pressure testing device is characterized by comprising a liquid pressure sensor, a microprocessor and a display module;
the liquid pressure sensor includes: the sensor comprises a sensing electrode, a reference electrode and a signal processing module, wherein the sensing electrode, the reference electrode and the signal processing module are formed by metal and oxides thereof; one end of the sensing electrode is in contact with the liquid, and the other end of the sensing electrode is connected with a lead to lead out a voltage signal and is fixed on the pipeline; the signal processing module filters and amplifies the obtained electric signals, and converts the voltage value through the A/D acquisition module;
the microprocessor is integrated with a pressure prediction model and is used for converting the voltage value into a liquid pressure value;
and the display module acquires and displays the liquid pressure value or/and the voltage value.
2. The pipeline liquid pressure test device of claim 1, wherein the metal electrode in the sensing electrode made of metal and its oxide is any one of tungsten, tantalum, molybdenum, titanium, niobium or platinum.
3. The pipeline liquid pressure test device of claim 1, wherein the reference electrode is an electrode capable of providing a stable potential in the liquid, including a saturated Ag/AgCl electrode, a calomel electrode, or a SiC electrode.
4. The novel pipeline liquid pressure testing method is characterized by comprising the following steps:
s1, installing a liquid pressure sensor on the inner surface of a simulation pipeline, and measuring voltage values in different states by adjusting the state of liquid in the simulation pipeline;
s2, measuring the liquid pressure values in different states in the step S1 by adopting a high-precision resistance type pressure sensor;
s3, carrying out linear fitting according to the liquid pressure values in different states and the corresponding voltage values to obtain corresponding pressure prediction models;
and S4, integrating the pressure prediction model into a microprocessor, mounting a liquid pressure sensor on the inner surface of the pipeline to be measured during measurement, connecting the microprocessor and a display module, measuring a voltage value, and reading the liquid pressure of the pipeline to be measured.
5. The method for testing the liquid pressure in the pipeline according to claim 4, wherein the different states in the step S2 specifically include:
different liquid media, liquid static, liquid dynamic at different flow rates.
6. The method for testing the liquid pressure in the pipeline according to claim 4, wherein the step of mounting the liquid pressure sensor on the inner surface of the pipeline specifically comprises:
will hydraulic sensor's sensing electrode one end is direct and liquid contact, and the sensing electrode other end links to each other with the wire and draws forth the signal of telecommunication, and intermediate junction sets up the waterproof interface of insulating seal, pass the pressure conduit and fix on the pipeline during the sensing electrode installation, and the intermediate junction position sets up sealed interface, concrete accessible waterproof hickey, gluey mode of sealing.
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| US4821564A (en) * | 1986-02-13 | 1989-04-18 | Atlantic Richfield Company | Method and system for determining fluid pressures in wellbores and tubular conduits |
| US20140200836A1 (en) * | 2011-06-30 | 2014-07-17 | Pedro Jose Lee | Flow rate determination method and apparatus |
| CN104459195A (en) * | 2014-12-02 | 2015-03-25 | 浙江大学 | Device and method for measuring ultralow liquid flow rate |
| CN110763866A (en) * | 2019-11-11 | 2020-02-07 | 湖南大学 | Liquid phase flow velocity measuring device and method |
| CN113049848A (en) * | 2021-03-31 | 2021-06-29 | 隋卓君 | Portable current meter based on numerical simulation and pressure sensor |
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2022
- 2022-09-16 CN CN202211128396.9A patent/CN115452237B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4821564A (en) * | 1986-02-13 | 1989-04-18 | Atlantic Richfield Company | Method and system for determining fluid pressures in wellbores and tubular conduits |
| US20140200836A1 (en) * | 2011-06-30 | 2014-07-17 | Pedro Jose Lee | Flow rate determination method and apparatus |
| CN104459195A (en) * | 2014-12-02 | 2015-03-25 | 浙江大学 | Device and method for measuring ultralow liquid flow rate |
| CN110763866A (en) * | 2019-11-11 | 2020-02-07 | 湖南大学 | Liquid phase flow velocity measuring device and method |
| CN113049848A (en) * | 2021-03-31 | 2021-06-29 | 隋卓君 | Portable current meter based on numerical simulation and pressure sensor |
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