CN111879351A - Pipeline graphene composite film sensor - Google Patents

Pipeline graphene composite film sensor Download PDF

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Publication number
CN111879351A
CN111879351A CN202010473834.XA CN202010473834A CN111879351A CN 111879351 A CN111879351 A CN 111879351A CN 202010473834 A CN202010473834 A CN 202010473834A CN 111879351 A CN111879351 A CN 111879351A
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CN
China
Prior art keywords
pipeline
sensor
graphene
elastic
assembly
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CN202010473834.XA
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Chinese (zh)
Inventor
李学瑞
李炯利
***
于公奇
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Beijing Graphene Technology Research Institute Co Ltd
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Beijing Graphene Technology Research Institute Co Ltd
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Priority to CN202010473834.XA priority Critical patent/CN111879351A/en
Publication of CN111879351A publication Critical patent/CN111879351A/en
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/64—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by measuring electrical currents passing through the fluid flow; measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact or friction effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01L9/04—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 of resistance-strain gauges

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The application relates to a pipeline graphene composite film sensor. The pipeline graphene composite film sensor is provided with an elastic substrate, and the graphene sensor is arranged on one side, away from the inner wall of the pipeline to be detected, of the elastic substrate. Because the elastic substrate can utilize self deformation butt in the inner wall of the pipeline that awaits measuring, can exert external force so that the elastic substrate produces elastic deformation to the direction that the volume reduces when installing the elastic substrate promptly to extrude and butt in the inner wall of the pipeline that awaits measuring after removing external force, so the improvement or the destruction to the pipeline that awaits measuring can be avoided to pipeline graphite alkene composite film sensor when using, can realize the detection to the flow and the pressure of the pipeline or the gas circuit that awaits measuring.

Description

Pipeline graphene composite film sensor
Technical Field
The application relates to the technical field of pipeline monitoring, in particular to a pipeline graphene composite film sensor.
Background
In the conventional scheme, the plant and mining enterprises generally use turbine flow meters, roots flow meters, diaphragm flow meters and the like as the flow meters.
However, the above solution requires the docking with the pipe to be monitored, i.e. the modification of the pipe or the destruction of the original pipe.
Disclosure of Invention
Based on this, it is necessary to provide a pipeline graphene composite film sensor for solving the problem that the pipeline needs to be improved or the original pipeline needs to be damaged when the pipeline to be monitored is butted in the prior art.
The application provides a pipeline graphite alkene composite film sensor includes:
the elastic substrate is used for abutting against the inner wall of the pipeline to be detected by utilizing the deformation of the elastic substrate; and
the graphene sensor is arranged on one side, away from the inner wall of the pipeline to be detected, of the elastic substrate and used for detecting the flow and the pressure in the pipeline to be detected.
In one embodiment, the elastic substrate includes at least two elastic bodies, the at least two elastic bodies are both arc-shaped and jointly enclose to form an annular structure, and the radius of the at least two elastic bodies is larger than that of the pipe to be measured within a preset range.
In one embodiment, one end of the elastic body is provided with a butt joint hole, the other end of the elastic body is provided with a bulge matched with the butt joint hole, and the elastic body is connected with the elastic body with the same structure through the butt joint hole and the bulge in an end-to-end mode along the circumferential direction.
In one embodiment, a first mounting hole and a second mounting hole are formed in one side, away from the inner wall of the pipeline to be tested, of the elastic substrate;
the graphene sensor comprises a flow sensor and a pressure sensor, the flow sensor is arranged in the first mounting hole and used for measuring the flow of the pipeline to be measured, and the pressure sensor is arranged in the second mounting hole and used for measuring the pressure of the pipeline to be measured.
In one embodiment, the flow sensor comprises:
a sensor base;
the first resistor assembly is arranged on the surface of the sensor substrate, which is far away from the inner wall of the pipeline to be tested, and is used for generating resistance value change when the flow in the pipeline to be tested changes; and
the first detection assembly is positioned on one side, close to the inner wall of the pipeline to be detected, of the sensor substrate, is electrically connected with the first resistance assembly, and is used for detecting voltage changes at two ends of the first resistance assembly, calculating resistance value changes of the first resistance assembly according to the voltage changes, and determining flow changes according to the resistance value changes of the first resistance assembly.
In one embodiment, the first resistive component comprises:
the first graphene protective layer covers the surface of the sensor substrate, which is far away from the inner wall of the pipeline to be detected;
the heating resistor is arranged on one side, far away from the sensor substrate, of the first graphene protection layer;
the two thermistors are arranged on one side, away from the sensor substrate, of the first graphene protective layer and are symmetrical relative to the heating resistor; and
and the second graphene protective layer covers the heating resistor and one side, far away from the first graphene protective layer, of the two thermistors.
In one embodiment, the first detection assembly comprises:
the first detection circuit is electrically connected with the first resistor assembly and used for detecting voltage changes at two ends of the first resistor assembly, calculating resistance value changes of the first resistor assembly according to the voltage changes and determining the flow rate changes according to the resistance value changes of the first resistor assembly; and
and the first radio frequency circuit is electrically connected with the first detection circuit and is used for sending the flow change to a remote terminal.
In one embodiment, the pressure sensor comprises:
an elastic base film covering the second mounting hole;
the second resistance assembly is arranged on the surface, close to the inner wall of the pipeline to be detected, of the elastic base film and is used for generating deformation when the pressure in the pipeline to be detected changes; and
and the second detection assembly is positioned on one side of the elastic base film, which is close to the inner wall of the pipeline to be detected, is electrically connected with the second resistance assembly, and is used for detecting the voltage change at the two ends of the second resistance assembly, calculating the resistance change of the second resistance assembly according to the voltage change, and determining the pressure change according to the resistance change of the second resistance assembly.
In one embodiment, the second detection assembly comprises:
the second detection circuit is electrically connected with the second resistor assembly and used for detecting voltage changes at two ends of the second resistor assembly, calculating resistance value changes of the second resistor assembly according to the voltage changes and determining the pressure changes according to the resistance value changes of the second resistor assembly; and
and the second radio frequency circuit is electrically connected with the second detection circuit and is used for transmitting the pressure change to a remote terminal.
In one embodiment, the second resistive component comprises:
the third graphene protective layer covers the surface, close to the inner wall of the pipeline to be detected, of the elastic base film;
the four strain resistors are arranged on one side, away from the elastic base film, of the third graphene protective layer and are electrically connected to form a bridge circuit; and
and the fourth graphene protective layer covers one side of the four strain resistors far away from the third graphene protective layer.
In one embodiment, four strain resistors are distributed on the same diameter of the elastic base film, the middle two strain resistors extend along the diameter direction, and the two strain resistors at two ends extend along the direction perpendicular to the diameter direction.
In one embodiment, the pressure sensor further includes a supporting plate disposed between the elastic base film and the second detecting member for preventing the second resistor member from being deformed too much and damaged.
The utility model provides a pipeline graphite alkene composite film sensor is through setting up the elasticity basement, and graphite alkene sensor sets up and keeps away from in the elasticity basement one side of the pipeline inner wall that awaits measuring. Because the elastic substrate can utilize self deformation butt in the inner wall of the pipeline that awaits measuring, can exert external force so that the elastic substrate produces elastic deformation to the direction that the volume reduces when installing the elastic substrate promptly to extrude and butt in the inner wall of the pipeline that awaits measuring after removing external force, so the improvement or the destruction to the pipeline that awaits measuring can be avoided to pipeline graphite alkene composite film sensor when using, can realize the detection to the flow and the pressure of the pipeline or the gas circuit that awaits measuring.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure view of a graphene composite thin film sensor for a pipeline according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an elastomer butt-joint hole and a protrusion in a graphene composite thin film sensor for a pipeline according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a flow sensor in a graphene composite film sensor for a pipeline according to an embodiment of the present disclosure;
fig. 4 is a schematic cross-sectional structure view of a flow sensor in a graphene composite thin film sensor for a pipeline according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a pressure sensor in a graphene composite film sensor for a pipeline according to an embodiment of the present application;
fig. 6 is a schematic cross-sectional structure view of a pressure sensor in a graphene composite thin film sensor for a pipeline according to an embodiment of the present application.
Description of the reference numerals
100 pipeline graphene composite film sensor
10 elastic substrate
110 sensor mounting hole
111 first mounting hole
112 second mounting hole
120 elastic body
121 butt joint hole
122 bulge
20 graphene sensor
210 flow sensor
211 sensor base body
212 first resistance component
213 first detection assembly
214 first graphene protective layer
215 heating resistor
216 thermistor
217 second graphene protective layer
218 first detection circuit
219 first radio frequency circuit
220 pressure sensor
221 elastic base film
222 second resistive element
223 second detection assembly
224 third graphene protective layer
225 strain resistance
226 fourth graphene protective layer
227 support plate
228 second detection circuit
229 second radio frequency circuit
231 first sealing cover
232 second sealing cover
200 pipeline to be tested
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present application provides a graphene composite thin film sensor 100 for a pipeline. The pipeline graphene composite thin film sensor 100 includes an elastic substrate 10 and a graphene sensor 20. The elastic substrate 10 is used for abutting against the inner wall of the pipe to be tested by utilizing the deformation of the elastic substrate, that is, the elastic substrate 10 is used for being subjected to external force and being elastically deformed inwards when being installed, and is extruded and abutted against the inner wall of the pipe to be tested 200 after the external force is removed. The graphene sensor 20 is disposed on a side of the elastic substrate 10 away from the inner wall of the pipe 200 to be measured. In one embodiment, the side of the elastic base 10 away from the inner wall of the pipe 200 to be measured is provided with a sensor mounting hole 110. The graphene sensor 20 is disposed in the sensor mounting hole 110, and is configured to detect a flow rate and a pressure in the pipe 200 to be detected.
The utility model provides a pipeline graphite alkene composite film sensor 100 is through setting up elasticity basement 10, and graphite alkene sensor 20 sets up and keeps away from in elasticity basement 10 one side of the pipeline 200 inner walls that await measuring. Because the elastic substrate 10 can be pressed against the inner wall of the pipeline 200 to be tested by using the deformation of the elastic substrate 10, that is, an external force can be applied when the elastic substrate 10 is installed, so that the elastic substrate 10 is elastically deformed in the direction of reducing the volume, and is pressed and pressed against the inner wall of the pipeline 200 to be tested after the external force is removed, the pipeline graphene composite film sensor 100 can avoid the improvement or the damage to the pipeline 200 to be tested when in use, and the detection of the flow and the pressure of the pipeline 200 to be tested or the gas circuit can be realized.
In one embodiment, the elastic substrate 10 includes at least two elastic bodies 120, the at least two elastic bodies 120 are circular arcs and jointly enclose to form an annular structure, and the radius of the at least two elastic bodies 120 is larger than the radius of the pipe 200 to be measured within a preset range. In this embodiment, the radius of the at least two elastic bodies 120 may be slightly larger than the radius of the pipe 200 to be measured, so that the two elastic bodies 120 may be extruded and abutted against the inner wall of the pipe 200 to be measured after being installed on the inner wall of the pipe 200 to be measured, thereby fixing the two elastic bodies 120.
In one embodiment, the elastic substrate 10 may include two elastic bodies 120. Protrusions similar to a handle shape are provided near both end surfaces of the elastic body 120. When the elastic body 120 is installed inside the pipe 200 to be tested, the clamp can be used to act on the handle-shaped protrusions at the two ends of the elastic body 120, so that the two ends of the elastic body 120 are bent inward, the distance between the two ends of the semicircular elastic body 120 is slightly smaller than the diameter of the pipe, then the elastic body 120 is loosened after the elastic body 120 is sent into the position to be monitored in the pipe 200 to be tested, and the elastic body 120 can be extruded and abutted against the inner wall of the pipe 200 to be tested. It will be appreciated that another elastomer 120 may be fed into the pipe 200 to be monitored at the same location in the same manner. In this embodiment, the elastic body 120 may be made of an elastic alloy material, and the elastic alloy material has, in addition to good elastic properties, non-magnetism, high resistance to micro-plastic deformation, high hardness, low resistivity, small temperature coefficient of elastic modulus, small internal loss, and other properties, and can improve the properties of the graphene composite thin film sensor 100 and prolong the service life of the graphene composite thin film sensor 100.
Referring to fig. 2, in one embodiment, one end of the elastic body 120 is provided with a butting hole 121, and the other end is provided with a protrusion 122 matched with the butting hole 121, and the elastic body 120 is connected with another elastic body 120 with the same structure end to end along a circumferential direction through the butting hole 121 and the protrusion 122. In one embodiment, the docking hole 121 may be a cylindrical blind hole, and the protrusion 122 cooperating therewith may be a cylinder cooperating with the docking hole 121. In this embodiment, after the two elastic bodies 120 are installed on the inner wall surface of the pipeline 200 to be measured, the two elastic bodies 120 may be located at the same radial position of the pipeline 200 to be measured, so that the butt-joint hole 121 at the end of the first elastic body 120 is matched with the protrusion 122 at the end of the second elastic body 120, and the protrusion 122 at the end of the first elastic body 120 is matched with the butt-joint hole 121 at the end of the second elastic body 120, thereby improving the connection strength between the two elastic bodies 120, ensuring the installation stability of the pipeline graphene composite film sensor 100, and improving the measurement accuracy.
In one embodiment, the sensor mounting holes 110 include a first mounting hole 111 and a second mounting hole 112; the graphene sensor 20 includes a flow sensor 210 and a pressure sensor 220, the flow sensor 210 is disposed in the first mounting hole 111 for measuring a flow rate of the pipe 200 to be measured, and the pressure sensor 220 is disposed in the second mounting hole 112 for measuring a pressure of the pipe 200 to be measured. In this embodiment, the flow sensor 210 and the pressure sensor 220 may be disposed in different mounting holes, so as to avoid mutual influence of the two sensors during the flow measurement and the pressure measurement. In one embodiment, the first mounting hole 111 and the second mounting hole 112 may be located in the same radial direction of the pipe 200 to be tested and located on one elastic body 120. The first and second mounting holes 111 and 112 may be blind threaded holes, the flow sensor 210 may be in threaded connection with the first mounting hole 111, and the pressure sensor 220 may be in threaded connection with the second mounting hole 112, so as to improve the connection strength between the flow sensor 210 and the pressure sensor 220 and the elastic body 120.
Referring to fig. 3-4 together, in one embodiment, the flow sensor 210 includes a sensor base 211, a first resistive element 212, and a first sensing element 213. The flow sensor 210 may be located on the surface or inside the elastic body 120 corresponding thereto. The first resistor assembly 212 is disposed on a surface of the sensor substrate 211 away from the inner wall of the pipe 200 to be measured, and is configured to generate a resistance value change when a flow rate in the pipe 200 to be measured changes. The first detecting element 213 is located on one side of the sensor substrate 211 close to the inner wall of the pipe 200 to be measured, electrically connected to the first resistor element 212, and configured to detect a voltage change at two ends of the first resistor element 212, calculate a resistance change of the first resistor element 212 according to the voltage change, and determine a flow rate change according to the resistance change of the first resistor element 212.
In one embodiment, the material of the sensor body 211 may be a silicon wafer or an elastic alloy material, etc. to provide a mounting substrate for the first resistive element 212 and/or the first sensing element 213. In this embodiment, the sensor base 211 of the flow sensor 210 may be formed by an upper portion and a lower portion, wherein the upper portion and the lower portion of the sensor base 211 may be manufactured by an integral process. The upper portion of the sensor base 211 is a circular thin plate, the lower portion thereof may be a hollow cylinder structure having a certain thickness, and the outer surface of the hollow cylinder is threaded to match the threads in the sensor mounting hole 110 of the elastic body 120.
In one embodiment, the flow sensor 210 further comprises a first sealing cap 231, and the first sealing cap 231 is used for sealing the hollow cylindrical structure below the sensor base 211. The first detecting component 213 is located at a side of the sensor substrate 211 close to the inner wall of the to-be-detected pipe 200, and is located at a side of the first sealing cover 231 away from the inner wall of the to-be-detected pipe 200, that is, the first detecting component 213 is located in a hollow cylinder structure formed by the first sealing cover 231 and the sensor substrate 211 together.
In one embodiment, the first resistor assembly 212 includes a first graphene overcoat layer 214, a heating resistor 215, two thermistors 216, and a second graphene overcoat layer 217. The first graphene protection layer 214 covers the surface of the sensor substrate 211 away from the inner wall of the pipe 200 to be measured. The heating resistor 215 is disposed on a side of the first graphene protection layer 214 away from the sensor substrate 211. The two thermistors 216 are disposed on a side of the first graphene protective layer 214 away from the sensor substrate 211, and are symmetrical with respect to the heating resistor 215. The second graphene overcoat layer 217 covers the heating resistor 215 and the side of the two thermistors 216 away from the first graphene overcoat layer 214.
In one embodiment, the flow resistor formed by the heater resistor 215 and the two thermistors 216 may be fabricated by Micro Electro Mechanical Systems (MEMS) micromachining. In this embodiment, the heating resistor 215 may be located at the center of the surface of the sensor substrate 211 away from the inner wall of the pipe 200 to be tested, and the two thermistors 216 are respectively located at two sides of the heating resistor 215, and may be located at the same distance from the heating resistor 215, that is, the two thermistors 216 are symmetrical with respect to the heating resistor 215.
In one embodiment, the first graphene protection layer 214 and the second graphene protection layer 217 may be graphene anti-corrosion and heat dissipation coatings covering the upper and lower surfaces of the heating resistor 215 and the two thermistors 216, which may promote heat dissipation on the surface of the resistor, protect the resistor, and prevent moisture from corroding and damaging the resistor. It can be understood that the upper and lower surfaces of the heating resistor 215 and the two thermistors 216 are coated with the high-temperature-resistant and corrosion-resistant insulating composite ceramic material to form the anticorrosive coating with the graphene, so that the use in certain acid-base corrosion and steam environments can be met, the heat dissipation capacity of the sensor can be increased, and the error of temperature to measurement can be reduced.
It is understood that when the flow sensor 210 is operated, the heating resistor 215 may be supplied with an operating current through the power supply, and the heating resistor 215 may generate a preset stable temperature. Since the two thermistors 216 are symmetrically disposed on both sides of the heating resistor 215, the initial states of the two thermistors 216 are the same. When the pipe 200 to be tested passes through gas or fluid, the flow of the gas or fluid will cause the temperature fields at the two thermistors 216 to change asymmetrically, so as to change the resistance values of the two thermistors 216. Therefore, the fluid flow can be determined according to the relationship between the fluid flow, the flow rate and the electric signal generated by the resistance value change of the two thermistors 216, so that the flow measurement of gas or fluid is realized. In another embodiment, the heating resistor 215 may be various types of heaters.
In one embodiment, the first detection component 213 includes a first detection circuit 218 and a first radio frequency circuit 219. The first detection circuit 218 is electrically connected to the first resistor element 212, and is configured to detect a voltage change across the first resistor element 212, calculate a resistance change of the first resistor element 212 according to the voltage change, and determine a flow rate change according to the resistance change of the first resistor element 212. The first rf circuitry 219 is electrically connected to the first detection circuitry 218 for transmitting the flow rate change to a remote terminal or signal receiver.
In this embodiment, the first detection circuit 218 may be disposed between the first sealing cover 231 and the sensor base 211, may be electrically connected to the two thermistors 216, calculates a resistance change of the first resistor assembly 212 according to the voltage change by measuring the voltage change of the two thermistors 216, and determines a flow rate change according to the resistance change of the first resistor assembly 212. A first rf circuit 219 may be located between the first seal cap 231 and the sensor base 211, and its input may be electrically connected to the output of the first sensing circuit 218, thereby forming an output for the flow signal.
In one embodiment, the first rf circuitry 219 may include an rf. The two thermistors 216 can convert the flow signal in the pipeline 200 to be measured into an electrical signal, then the signal is transmitted to a remote control terminal or a signal receiver through a radio frequency device, the corresponding relation between the electrical signal and the flow signal can be obtained through a signal analysis circuit in the remote control terminal or the signal receiver, and the measurement of the flow of the pipeline 200 to be measured can be realized according to a preset relational expression.
Referring to fig. 5-6, in one embodiment, the pressure sensor 220 includes an elastic base film 221, a second resistance component 222 and a second detection component 223, which can be fixedly mounted on the surface or inside of the elastic body 120. The elastic base film 221 covers the second mounting hole 112. The second resistor assembly 222 is disposed on the surface of the elastic base film 221 near the inner wall of the pipe 200 to be tested, and is configured to deform when the pressure in the pipe 200 to be tested changes. The second detection component 223 is located on one side of the elastic base film 221 close to the inner wall of the pipe 200 to be detected, electrically connected to the second resistance component 222, and configured to detect a voltage change at two ends of the second resistance component 222, calculate a resistance value change of the second resistance component 222 according to the voltage change, and determine a pressure change according to the resistance value change of the second resistance component 222.
In this embodiment, the elastic base film 221 may be made of a material selected according to different application environments, and specifically may be a flexible material such as polyimide and copper foil, or may also be a material with an elastic support such as a silicon wafer or an elastic alloy material. It is understood that the thickness of the elastic base film 221 may be set according to the measured pressure range, when the pressure of the pipe 200 to be measured is larger, the thickness of the elastic base film 221 may be increased appropriately, and when the pressure is smaller, the thickness of the elastic base film 221 may be decreased appropriately, which is not particularly limited in this application.
In one embodiment, the second detection component 223 includes a second detection circuit 228 and a second radio frequency circuit 229. The second detection circuit 228 is electrically connected to the second resistor element 222, and is configured to detect a voltage change across the second resistor element 222, calculate a resistance change of the second resistor element 222 according to the voltage change, and determine a pressure change according to the resistance change of the second resistor element 222. The second rf circuit 229 is electrically connected to the second detection circuit 228 for transmitting the pressure change to the remote terminal.
In this embodiment, the second detection circuit 228 may be disposed between the second sealing cover 232 and the sensor base 211, may be electrically connected to the second resistor assembly 222 formed by four strain resistors 225, and may calculate a resistance change of the second resistor assembly 222 according to the voltage change by measuring the voltage change of the four strain resistors 225, and determine the pressure change according to the resistance change of the second resistor assembly 222. A second rf circuit 229 may be located between the second seal cap 232 and the sensor base 211 and may have an input electrically connected to an output of the second sensing circuit 228 to form an output for a pressure signal.
In one embodiment, the edge of the elastic base film 221 in the pressure sensor 120 may be fixedly mounted on the surface of the elastic body 120 by vacuum diffusion welding and covers the second mounting hole 112. The surface of the elastic base film 221 is provided with a second resistance component 222, and the second resistance component 222 is positioned on one side of the elastic base film 221 facing the inner wall of the pipe 200 to be tested. It can be understood that when the pipe 200 to be tested has gas or fluid passing through and generates pressure on the inner wall of the pipe 200 to be tested, the pressure will cause the elastic base film 221 to deform, and further cause the bridge in the second resistor assembly 222 on the surface of the elastic base film 221 to be unbalanced, so as to convert the pressure signal of the pipe 200 to be tested into an electrical signal.
In one embodiment, the second resistive component 222 includes a third graphene protective layer 224, four strain resistors 225, and a fourth graphene protective layer 226. The third graphene protective layer 224 covers the surface of the elastic base film 221 close to the inner wall of the pipe 200 to be measured. The four strain resistors 225 are disposed on a side of the third graphene protection layer 224 away from the elastic base film 221, and the four strain resistors 225 are electrically connected to form a bridge circuit. The fourth graphene protection layer 226 covers a side of the four strain resistors 225 far from the third graphene protection layer 224.
In this embodiment, the third graphene protection layer 224 and the fourth graphene protection layer 226 may be graphene anti-corrosion heat dissipation coatings covering the upper and lower surfaces of the four strain resistors 225, so as to promote heat dissipation of the resistor surface, protect the resistors, and prevent corrosion damage to the resistors caused by moisture and the like. It can be understood that the upper surface and the lower surface of the four strain resistors 225 are coated with high-temperature-resistant and corrosion-resistant insulating composite ceramic materials to form an anticorrosive coating with graphene, so that the use in certain acid-base corrosion and steam environments can be met, the heat dissipation capacity of the sensor can be increased, and the error of temperature to measurement is reduced.
In one embodiment, four strain resistors 225 are distributed on the same diameter of the elastic base film 221, the middle two strain resistors 225 extend along the diameter direction, and the two strain resistors 225 at the two ends extend along the direction perpendicular to the diameter direction. In this embodiment, two of the strain resistors 255 may be distributed near the center of the elastic base film 221, and the remaining two strain resistors 255 may be distributed near the edge of the elastic base film 221.
In one embodiment, when the pipe 200 to be tested is pressed radially outward, the elastic base film 221 is recessed away from the center toward the bottom of the second mounting hole 112. The strain resistors R3 and R4 near the center of the elastic base film 221 are deformed in tension, and the strain resistors R1 and R2 near the edge of the elastic base film 221 are deformed in compression, so that the bridges formed by the four strain resistors 255 are not balanced, and an output voltage can be generated.
In one embodiment, the pressure sensor 220 further comprises a second sealing cover 232, and a second rf circuit is disposed at the upper end of the second sealing cover 232, i.e., the side of the second sealing cover 232 facing the elastic base film 221. In this embodiment, the second rf circuit may include an rf. Since the four strain resistors 225 are connected in a bridge, the output of the bridge can be connected to the input of the rf device, thereby forming the output of the pressure signal. The bridge formed by the four strain resistors 225 can convert the pressure signal in the pipeline 200 to be measured into an electric signal, then the signal is transmitted to a remote control terminal or a signal receiver through a radio frequency device, the corresponding relation between the electric signal and the pressure signal can be obtained through a signal analysis circuit in the remote control terminal or the signal receiver, and the measurement of the pressure of the pipeline 200 to be measured can be realized according to a preset relational expression.
In one embodiment, the pressure sensor 220 further comprises a supporting plate 227, wherein the supporting plate 227 is disposed between the elastic base film 221 and the second detecting element 223 for preventing the second resistor element 222 from being deformed too much and damaged. A supporting plate 227 is further disposed between the elastic base film 221 and the radio frequency device, and the supporting plate 227 can be used to prevent the strain resistor 255 from being damaged due to excessive deformation of the elastic base film 221, so that the pressure sensor 220 cannot realize pressure measurement.
In one embodiment, the heating resistor 215, the two thermistors 216, and the four strain resistors 225 may all be designed and manufactured by a Micro Electro Mechanical Systems (MEMS) process, which has the advantage of miniaturization, and may be applied to various micro installation environments, and are convenient for integration, thereby expanding the application range of the graphene composite thin film sensor 100.
It can be understood that the graphene composite film sensor 100 provided by the present application is installed inside the to-be-measured pipeline 200 through the elastic substrate 10 by the flow sensor 210 and the pressure sensor 220, and the first radio frequency circuit 219 and the second radio frequency circuit are adopted to transmit the flow signal and the pressure signal respectively, so that the connection between the external sensor and the to-be-measured pipeline 200 in a manner (drilling and disconnecting) of damaging the to-be-measured pipeline 200 in a conventional scheme can be avoided, and the structure and function of the original to-be-measured pipeline 200 structure are maintained.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A pipeline graphene composite film sensor, comprising:
the elastic substrate is used for abutting against the inner wall of the pipeline to be detected by utilizing the deformation of the elastic substrate; and
the graphene sensor is arranged on one side, away from the inner wall of the pipeline to be detected, of the elastic substrate and used for detecting the flow and the pressure in the pipeline to be detected.
2. The pipeline graphene composite thin film sensor according to claim 1, wherein the elastic substrate comprises at least two elastic bodies, the at least two elastic bodies are both arc-shaped and jointly enclose to form a circular ring-shaped structure, and the radius of the at least two elastic bodies is larger than that of the pipeline to be measured within a preset range.
3. The pipeline graphene composite thin film sensor according to claim 2, wherein one end of the elastic body is provided with a butt hole, the other end of the elastic body is provided with a protrusion matched with the butt hole, and the elastic body is connected with another elastic body with the same structure end to end in the circumferential direction through the butt hole and the protrusion.
4. The pipeline graphene composite thin film sensor according to claim 1, wherein a first mounting hole and a second mounting hole are formed in one side, away from the inner wall of the pipeline to be detected, of the elastic substrate;
the graphene sensor comprises a flow sensor and a pressure sensor, the flow sensor is arranged in the first mounting hole and used for measuring the flow of the pipeline to be measured, and the pressure sensor is arranged in the second mounting hole and used for measuring the pressure of the pipeline to be measured.
5. The graphene composite thin film sensor of claim 4, wherein the flow sensor comprises:
a sensor base;
the first resistor assembly is arranged on the surface of the sensor substrate, which is far away from the inner wall of the pipeline to be tested, and is used for generating resistance value change when the flow in the pipeline to be tested changes; and
the first detection assembly is positioned on one side, close to the inner wall of the pipeline to be detected, of the sensor substrate, is electrically connected with the first resistance assembly, and is used for detecting voltage changes at two ends of the first resistance assembly, calculating resistance value changes of the first resistance assembly according to the voltage changes, and determining flow changes according to the resistance value changes of the first resistance assembly.
6. The pipeline graphene composite thin film sensor of claim 5, wherein the first resistive component comprises:
the first graphene protective layer covers the surface of the sensor substrate, which is far away from the inner wall of the pipeline to be detected;
the heating resistor is arranged on one side, far away from the sensor substrate, of the first graphene protection layer;
the two thermistors are arranged on one side, away from the sensor substrate, of the first graphene protective layer and are symmetrical relative to the heating resistor; and
and the second graphene protective layer covers the heating resistor and one side, far away from the first graphene protective layer, of the two thermistors.
7. The pipeline graphene composite thin film sensor of claim 5, wherein the first detection assembly comprises:
the first detection circuit is electrically connected with the first resistor assembly and used for detecting voltage changes at two ends of the first resistor assembly, calculating resistance value changes of the first resistor assembly according to the voltage changes and determining the flow rate changes according to the resistance value changes of the first resistor assembly; and
and the first radio frequency circuit is electrically connected with the first detection circuit and is used for sending the flow change to a remote terminal.
8. The pipeline graphene composite thin film sensor of claim 4, wherein the pressure sensor comprises:
an elastic base film covering the second mounting hole;
the second resistance assembly is arranged on the surface, close to the inner wall of the pipeline to be detected, of the elastic base film and is used for generating deformation when the pressure in the pipeline to be detected changes; and
and the second detection assembly is positioned on one side of the elastic base film, which is close to the inner wall of the pipeline to be detected, is electrically connected with the second resistance assembly, and is used for detecting the voltage change at the two ends of the second resistance assembly, calculating the resistance change of the second resistance assembly according to the voltage change, and determining the pressure change according to the resistance change of the second resistance assembly.
9. The graphene composite film sensor according to claim 8, wherein the second detection assembly comprises:
the second detection circuit is electrically connected with the second resistor assembly and used for detecting voltage changes at two ends of the second resistor assembly, calculating resistance value changes of the second resistor assembly according to the voltage changes and determining the pressure changes according to the resistance value changes of the second resistor assembly; and
and the second radio frequency circuit is electrically connected with the second detection circuit and is used for transmitting the pressure change to a remote terminal.
10. The pipe graphene composite thin film sensor of claim 8, wherein the second resistive component comprises:
the third graphene protective layer covers the surface, close to the inner wall of the pipeline to be detected, of the elastic base film;
the four strain resistors are arranged on one side, away from the elastic base film, of the third graphene protective layer and are electrically connected to form a bridge circuit; and
and the fourth graphene protective layer covers one side of the four strain resistors far away from the third graphene protective layer.
11. The graphene composite thin film sensor as claimed in claim 10, wherein four strain resistors are distributed on the same diameter of the elastic base film, the middle two strain resistors extend along the diameter direction, and the two strain resistors at two ends extend along a direction perpendicular to the diameter direction.
12. The graphene composite film sensor for pipelines according to claim 8, wherein the pressure sensor further comprises a supporting plate, the supporting plate is disposed between the elastic base film and the second detection assembly, and is used for preventing the second resistance assembly from being damaged due to too large deformation.
CN202010473834.XA 2020-05-29 2020-05-29 Pipeline graphene composite film sensor Pending CN111879351A (en)

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CN202010473834.XA CN111879351A (en) 2020-05-29 2020-05-29 Pipeline graphene composite film sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010473834.XA CN111879351A (en) 2020-05-29 2020-05-29 Pipeline graphene composite film sensor

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CN111879351A true CN111879351A (en) 2020-11-03

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