Pipeline graphene composite film sensor

Abstract

The present application relates to a pipeline graphene composite thin film sensor. The pipeline graphene composite thin film sensor is provided by setting an elastic substrate, and setting the graphene sensor on the side of the elastic substrate away from the inner wall of the pipeline to be measured. Since the elastic substrate can use its own deformation to abut against the inner wall of the pipeline to be measured, that is, when the elastic substrate is installed, an external force can be applied to make the elastic substrate produce elastic deformation in the direction of reducing volume, and squeeze and abut against the inner wall of the pipeline to be measured after the external force is removed, the pipeline graphene composite thin film sensor can avoid modification or damage to the pipeline to be measured when in use, and can realize the detection of the flow and pressure of the pipeline or gas path to be measured.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline monitoring, and in particular to a pipeline graphene composite film sensor. Background Art

[0002] In traditional solutions, factories and mines usually use turbine flowmeters, Roots flow disc meters and diaphragm flowmeters as flow disc meters.

[0003] However, the above scheme needs to be connected with the pipeline to be monitored, that is, the pipeline needs to be improved or the original pipeline needs to be destroyed. Summary of the invention

[0004] Based on this, it is necessary to provide a pipeline graphene composite thin film sensor to address the problem in the prior art that the pipeline needs to be improved or the original pipeline needs to be destroyed when docking with the pipeline to be monitored.

[0005] The present application provides a pipeline graphene composite film sensor, comprising:

[0006] An elastic base, used to abut against the inner wall of the pipe to be tested by utilizing its own deformation; and

[0007] The graphene sensor is arranged on a side of the elastic substrate away from the inner wall of the pipeline to be tested, and is used to detect the flow rate and pressure in the pipeline to be tested.

[0008] In one embodiment, the elastic base includes at least two elastic bodies, both of which are arc-shaped and together form a circular ring structure, and the radius of the at least two elastic bodies is greater than the radius of the pipeline to be tested within a preset range.

[0009] In one embodiment, a docking hole is provided at one end of the elastomer, and a protrusion matching the docking hole is provided at the other end. The elastomer is connected end to end with another elastomer with the same structure along the circumferential direction through the docking hole and the protrusion.

[0010] In one embodiment, a first mounting hole and a second mounting hole are formed on a side of the elastic base away from the inner wall of the pipeline to be tested;

[0011] The graphene sensor includes a flow sensor and a pressure sensor. The flow sensor is arranged at the first mounting hole to measure the flow of the pipeline to be tested, and the pressure sensor is arranged at the second mounting hole to measure the pressure of the pipeline to be tested.

[0012] In one embodiment, the flow sensor comprises:

[0013] Sensor substrate;

[0014] A first resistor component is disposed on a surface of the sensor substrate away from the inner wall of the pipeline to be measured, and is used to generate a resistance value change when the flow in the pipeline to be measured changes; and

[0015] The first detection component is located on one side of the sensor base close to the inner wall of the pipeline to be tested, and is electrically connected to the first resistor component, and is used to detect the voltage change across the first resistor component, calculate the resistance change of the first resistor component according to the voltage change, and determine the flow change according to the resistance change of the first resistor component.

[0016] In one embodiment, the first resistor component comprises:

[0017] A first graphene protective layer covers the surface of the sensor substrate away from the inner wall of the pipeline to be measured;

[0018] A heating resistor is arranged on a side of the first graphene protection layer away from the sensor substrate;

[0019] two thermistors, disposed on a side of the first graphene protection layer away from the sensor substrate and symmetrically about the heating resistor; and

[0020] The second graphene protection layer covers the heating resistor and a side of the two thermistors away from the first graphene protection layer.

[0021] In one embodiment, the first detection component includes:

[0022] a first detection circuit, electrically connected to the first resistor component, for detecting a voltage change across the first resistor component, calculating a resistance change of the first resistor component according to the voltage change, and determining the flow change according to the resistance change of the first resistor component; and

[0023] The first radio frequency circuit is electrically connected to the first detection circuit and is used to send the flow change to a remote terminal.

[0024] In one embodiment, the pressure sensor comprises:

[0025] An elastic base membrane covering the second mounting hole;

[0026] A second resistor component is disposed on a surface of the elastic base film close to the inner wall of the pipeline to be tested, and is used to generate deformation when the pressure in the pipeline to be tested changes; and

[0027] The second detection component is located on a side of the elastic base membrane close to the inner wall of the pipeline to be tested, and is electrically connected to the second resistor component, and is used to detect the voltage change across the second resistor component, calculate the resistance change of the second resistor component according to the voltage change, and determine the pressure change according to the resistance change of the second resistor component.

[0028] In one embodiment, the second detection component includes:

[0029] a second detection circuit, electrically connected to the second resistance component, for detecting a voltage change across the second resistance component, calculating a resistance change of the second resistance component according to the voltage change, and determining the pressure change according to the resistance change of the second resistance component; and

[0030] The second radio frequency circuit is electrically connected to the second detection circuit and is used to send the pressure change to a remote terminal.

[0031] In one embodiment, the second resistor component includes:

[0032] A third graphene protective layer covers the surface of the elastic base film close to the inner wall of the pipeline to be tested;

[0033] Four strain resistors are arranged on a side of the third graphene protection layer away from the elastic base film, and the four strain resistors are electrically connected to form a bridge circuit; and

[0034] The fourth graphene protection layer covers a side of the four strain resistors away from the third graphene protection layer.

[0035] In one embodiment, the four strain resistors are distributed on the same diameter of the elastic base film, the two strain resistors in the middle extend in the direction of the diameter, and the two strain resistors at both ends extend in a direction perpendicular to the diameter.

[0036] In one embodiment, the pressure sensor further includes a support plate, which is disposed between the elastic base membrane and the second detection component to prevent the second resistor component from being damaged due to excessive deformation.

[0037] The pipeline graphene composite thin film sensor provided by the present application is provided with an elastic substrate, and the graphene sensor is provided on the side of the elastic substrate away from the inner wall of the pipeline to be measured. Since the elastic substrate can abut against the inner wall of the pipeline to be measured by its own deformation, that is, when the elastic substrate is installed, an external force can be applied to make the elastic substrate produce elastic deformation in the direction of volume reduction, and squeeze and abut against the inner wall of the pipeline to be measured after the external force is removed, the pipeline graphene composite thin film sensor can avoid modification or damage to the pipeline to be measured when in use, and can realize the detection of the flow rate and pressure of the pipeline to be measured or the gas path. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic diagram of the cross-sectional structure of a pipeline graphene composite film sensor provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of the docking hole and protrusion of the elastic body in a pipeline graphene composite film sensor provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the structure of a flow sensor in a pipeline graphene composite film sensor provided in an embodiment of the present application;

[0042] Figure 4 A schematic diagram of the cross-sectional structure of a flow sensor in a pipeline graphene composite film sensor provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the structure of a pressure sensor in a pipeline graphene composite film sensor provided in an embodiment of the present application;

[0044] Figure 6 A schematic diagram of the cross-sectional structure of a pressure sensor in a pipeline graphene composite thin film sensor provided in an embodiment of the present application.

[0045] Description of Figure Numbers

[0046] 100 Pipeline graphene composite film sensor

[0047] 10 Elastic base

[0048] 110 Sensor mounting hole

[0049] 111 First mounting hole

[0050] 112 Second mounting hole

[0051] 120 Elastomer

[0052] 121 Docking hole

[0053] 122 Bump

[0054] 20 Graphene Sensor

[0055] 210 Flow sensor

[0056] 211 sensor substrate

[0057] 212 first resistor component

[0058] 213 First Detection Component

[0059] 214 First graphene protective layer

[0060] 215 Heating resistor

[0061] 216 Thermistor

[0062] 217 Second graphene protective layer

[0063] 218 First detection circuit

[0064] 219 First RF Circuit

[0065] 220 Pressure Sensor

[0066] 221 Elastic basement membrane

[0067] 222 second resistor component

[0068] 223 Second detection component

[0069] 224 Third graphene protective layer

[0070] 225 strain gauge resistor

[0071] 226 Fourth graphene protective layer

[0072] 227 Support Plate

[0073] 228 Second detection circuit

[0074] 229 Second RF Circuit

[0075] 231 First sealing cover

[0076] 232 Second sealing cover

[0077] 200 pipelines to be tested DETAILED DESCRIPTION

[0078] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0079] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0081] Please also see Figure 1 The present application provides a pipeline graphene composite thin film sensor 100. The pipeline graphene composite thin film sensor 100 includes an elastic substrate 10 and a graphene sensor 20. The elastic substrate 10 is used to abut against the inner wall of the pipeline to be tested by using its own deformation, that is, the elastic substrate 10 is used to be subjected to external force during installation and elastically deform inward, and squeeze and abut against the inner wall of the pipeline 200 to be tested after the external force is removed. The graphene sensor 20 is arranged on the side of the elastic substrate 10 away from the inner wall of the pipeline 200 to be tested. In one embodiment, a sensor mounting hole 110 is opened on the side of the elastic substrate 10 away from the inner wall of the pipeline 200 to be tested. The graphene sensor 20 is arranged in the sensor mounting hole 110, and is used to detect the flow and pressure in the pipeline 200 to be tested.

[0082] The pipeline graphene composite thin film sensor 100 provided by the present application is provided with an elastic substrate 10, and the graphene sensor 20 is provided on the side of the elastic substrate 10 away from the inner wall of the pipeline to be measured 200. Since the elastic substrate 10 can abut against the inner wall of the pipeline to be measured 200 by its own deformation, that is, when the elastic substrate 10 is installed, an external force can be applied to make the elastic substrate 10 elastically deform in the direction of reducing the volume, and squeeze and abut against the inner wall of the pipeline to be measured 200 after the external force is removed, the pipeline graphene composite thin film sensor 100 can avoid modification or damage to the pipeline to be measured 200 when in use, and can realize the detection of the flow rate and pressure of the pipeline to be measured 200 or the gas path.

[0083] In one embodiment, the elastic base 10 includes at least two elastic bodies 120, and the at least two elastic bodies 120 are both arc-shaped and enclose together to form a circular ring structure, and the radius of the at least two elastic bodies 120 is greater than the radius of the pipeline to be tested 200 within a preset range. In this embodiment, the radius of the at least two elastic bodies 120 can be slightly greater than the radius of the pipeline to be tested 200, so that the two elastic bodies 120 can be pressed and abutted against the inner wall of the pipeline to be tested 200 after being installed on the inner wall of the pipeline to be tested 200, thereby achieving the fixation of the two elastic bodies 120.

[0084] In one embodiment, the elastic base 10 may include two elastic bodies 120. A protrusion similar to a handle shape is provided near the two end surfaces of the elastic body 120. When the elastic body 120 is installed inside the pipeline 200 to be tested, a clamp may be used to act on the protrusions in the shape of handles at both ends of the elastic body 120 to bend the two ends of the elastic body 120 inwardly, so that the distance between the two ends of the semicircular ring elastic body 120 is slightly smaller than the diameter of the pipeline, and then the elastic body 120 is sent into the position to be monitored in the pipeline 200 to be tested and then the elastic body 120 is released, and the elastic body 120 can be squeezed and abutted against the inner wall of the pipeline 200 to be tested. It can be understood that another elastic body 120 can be sent into the position to be monitored in the pipeline 200 to be tested in the same way. In this embodiment, the elastomer 120 can be made of an elastic alloy material. In addition to having good elastic properties, the elastic alloy material also has the properties of being non-magnetic, having high resistance to micro-plastic deformation, having high hardness, having low resistivity, having a small temperature coefficient of elastic modulus, and having small internal friction. It can improve the performance of the pipeline graphene composite thin film sensor 100 and extend the service life of the pipeline graphene composite thin film sensor 100.

[0085] Please also see Figure 2 In one embodiment, a docking hole 121 is provided at one end of the elastic body 120, and a protrusion 122 cooperating with the docking hole 121 is provided at the other end. The elastic body 120 is connected end to end with another elastic body 120 with the same structure in the circumferential direction through the docking hole 121 and the protrusion 122. In one embodiment, the docking hole 121 can be a cylindrical blind hole, and the protrusion 122 cooperating with it can 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 tested, they can be located at the same radial position of the pipeline 200 to be tested, so that the docking hole 121 at the end of the first elastic body 120 cooperates 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 cooperates with the docking hole 121 at the end of the second elastic body 120, so as to improve the connection strength between the two elastic bodies 120, ensure the stability of the installation of the pipeline graphene composite film sensor 100, and thus improve the measurement accuracy.

[0086] In one embodiment, the sensor mounting hole 110 includes 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 arranged in the first mounting hole 111, and is used to measure the flow of the pipeline 200 to be tested, and the pressure sensor 220 is arranged in the second mounting hole 112, and is used to measure the pressure of the pipeline 200 to be tested. In this embodiment, the flow sensor 210 and the pressure sensor 220 can be arranged in different mounting holes, so as to avoid the mutual influence of the two sensors during the flow measurement and pressure measurement process. In one embodiment, the first mounting hole 111 and the second mounting hole 112 can be located in the same radial direction of the pipeline 200 to be tested, and are respectively located on an elastic body 120. The first mounting hole 111 and the second mounting hole 112 can be threaded blind holes, the flow sensor 210 and the first mounting hole 111 can be threadedly connected, and the pressure sensor 220 and the second mounting hole 112 can be threadedly connected, so as to improve the connection strength between the flow sensor 210 and the pressure sensor 220 and the elastic body 120.

[0087] Please also see Figure 3-Figure 4 In one embodiment, the flow sensor 210 includes a sensor base 211, a first resistor component 212 and a first detection component 213. The flow sensor 210 can be located on the surface or inside of the corresponding elastic body 120. The first resistor component 212 is arranged on the surface of the sensor base 211 away from the inner wall of the pipeline 200 to be tested, and is used to generate a resistance change when the flow in the pipeline 200 to be tested changes. The first detection component 213 is located on a side of the sensor base 211 close to the inner wall of the pipeline 200 to be tested, and is electrically connected to the first resistor component 212, and is used to detect the voltage change at both ends of the first resistor component 212, and calculate the resistance change of the first resistor component 212 according to the voltage change, and determine the flow change according to the resistance change of the first resistor component 212.

[0088] In one embodiment, the material of the sensor base 211 can be silicon wafer or elastic alloy material, etc., to provide a mounting base for the first resistor component 212 and / or the first detection component 213. In this embodiment, the sensor base 211 of the flow sensor 210 can be composed of an upper and lower part, wherein the upper and lower parts of the sensor base 211 can be prepared by integral processing. The upper part of the sensor base 211 is a circular thin plate, and the lower part can be a hollow cylindrical structure with a certain thickness, and the outer surface of the hollow cylinder is processed with threads to match the threads in the sensor mounting hole 110 of the elastic body 120.

[0089] In one embodiment, the flow sensor 210 further includes a first sealing cover 231, and the first sealing cover 231 is used to seal the hollow cylindrical structure below the sensor base 211. The first detection component 213 is located on a side of the sensor base 211 close to the inner wall of the pipeline 200 to be tested, and is located on a side of the first sealing cover 231 away from the inner wall of the pipeline 200 to be tested, that is, the first detection component 213 is located in the hollow cylindrical structure enclosed by the first sealing cover 231 and the sensor base 211.

[0090] In one embodiment, the first resistor component 212 includes a first graphene protective layer 214, a heating resistor 215, two thermistors 216, and a second graphene protective layer 217. The first graphene protective layer 214 covers the surface of the sensor base 211 away from the inner wall of the pipeline 200 to be measured. The heating resistor 215 is arranged on a side of the first graphene protective layer 214 away from the sensor base 211. The two thermistors 216 are arranged on a side of the first graphene protective layer 214 away from the sensor base 211, and are symmetrical about the heating resistor 215. The second graphene protective layer 217 covers the side of the heating resistor 215 and the two thermistors 216 away from the first graphene protective layer 214.

[0091] In one embodiment, the flow resistor composed of the heating resistor 215 and the two thermistors 216 can be prepared by a micro-electromechanical system (MEMS) micro-machining process. In this embodiment, the heating resistor 215 can be located at the center of the surface of the sensor substrate 211 away from the inner wall of the pipeline 200 to be measured, and the two thermistors 216 are respectively located on both sides of the heating resistor 215, and can be at the same distance from the heating resistor 215, that is, the two thermistors 216 are symmetrical about the heating resistor 215.

[0092] In one embodiment, the first graphene protective layer 214 and the second graphene protective layer 217 can 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 can promote heat dissipation on the resistor surface, protect the resistor, and prevent corrosion damage to the resistor caused by moisture, etc. It can be understood that by coating the upper and lower surfaces of the heating resistor 215 and the two thermistors 216 with an anti-corrosion coating composed of high-temperature resistant and corrosion-resistant insulating composite ceramic material and graphene, it can also meet certain acid-base corrosion and steam environments, and at the same time increase the heat dissipation capacity of the sensor and reduce the error of temperature in measurement.

[0093] It can be understood that when the flow sensor 210 is working, the power supply can provide the operating current to the heating resistor 215, and the heating resistor 215 can generate a preset stable temperature. Since the two thermistors 216 are symmetrically distributed on both sides of the heating resistor 215, the initial states of the two thermistors 216 are the same. When gas or fluid passes through the pipeline 200 to be measured, the flow of gas or fluid will cause the temperature field at the two thermistors 216 to produce asymmetric changes, changing the resistance of the two thermistors 216. Therefore, the fluid flow rate can be determined according to the relationship between the electrical signals generated by the change in the resistance of the two thermistors 216, thereby realizing the flow measurement of gas or fluid. In another embodiment, the heating resistor 215 can also be various types of heaters.

[0094] 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 component 212, and is used to detect the voltage change across the first resistor component 212, and calculate the resistance change of the first resistor component 212 according to the voltage change, and determine the flow change according to the resistance change of the first resistor component 212. The first radio frequency circuit 219 is electrically connected to the first detection circuit 218, and is used to send the flow change to a remote terminal or a signal receiver.

[0095] In this embodiment, the first detection circuit 218 can be located between the first sealing cover 231 and the sensor base 211, and can be electrically connected to the two thermistors 216. By measuring the voltage change of the two thermistors 216, the resistance change of the first resistor component 212 is calculated according to the voltage change, and the flow change is determined according to the resistance change of the first resistor component 212. The first radio frequency circuit 219 can be located between the first sealing cover 231 and the sensor base 211, and its input end can be electrically connected to the output end of the first detection circuit 218, thereby forming an output end of the flow signal.

[0096] In one embodiment, the first radio frequency circuit 219 may include a radio frequency device. The two thermistors 216 may convert the flow signal in the pipeline 200 to be tested into an electrical signal, and then transmit the signal to the remote control terminal or the signal receiver through the radio frequency device. The corresponding relationship between the electrical signal and the flow signal may be obtained through the signal analysis circuit in the remote control terminal or the signal receiver, and the flow rate of the pipeline 200 to be tested may be measured according to the preset relationship.

[0097] Please also see Figure 5-Figure 6In one embodiment, the pressure sensor 220 includes an elastic base membrane 221, a second resistor 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 membrane 221 covers the second mounting hole 112. The second resistor component 222 is arranged on the surface of the elastic base membrane 221 close to the inner wall of the pipeline 200 to be tested, and is used to generate deformation when the pressure in the pipeline 200 to be tested changes. The second detection component 223 is located on the side of the elastic base membrane 221 close to the inner wall of the pipeline 200 to be tested, and is electrically connected to the second resistor component 222, and is used to detect the voltage change at both ends of the second resistor component 222, and calculate the resistance change of the second resistor component 222 according to the voltage change, and determine the pressure change according to the resistance change of the second resistor component 222.

[0098] In this embodiment, the elastic base film 221 can be made of different materials according to different application environments, and can be a flexible material such as polyimide and copper foil, or a silicon wafer or elastic alloy material with elastic support, etc. It can be understood that the thickness of the elastic base film 221 can be set according to the measured pressure range. When the pressure of the pipeline 200 to be measured is relatively high, the thickness of the elastic base film 221 can be appropriately increased, and when the pressure is relatively low, the thickness of the elastic base film 221 can be appropriately reduced. This application does not make specific limitations on this.

[0099] 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 component 222, and is used to detect the voltage change across the second resistor component 222, and calculate the resistance change of the second resistor component 222 according to the voltage change, and determine the pressure change according to the resistance change of the second resistor component 222. The second radio frequency circuit 229 is electrically connected to the second detection circuit 228, and is used to send the pressure change to the remote terminal.

[0100] In this embodiment, the second detection circuit 228 can be located between the second sealing cover 232 and the sensor substrate 211, and can be electrically connected to the second resistor assembly 222 composed of four strain resistors 225, by measuring the voltage change of the four strain resistors 225, calculating the resistance change of the second resistor assembly 222 according to the voltage change, and determining the pressure change according to the resistance change of the second resistor assembly 222. The second RF circuit 229 can be located between the second sealing cover 232 and the sensor substrate 211, and its input end can be electrically connected to the output end of the second detection circuit 228, thereby forming an output end of the pressure signal.

[0101] In one embodiment, the edge of the elastic base membrane 221 in the pressure sensor 120 can be fixedly mounted on the surface of the elastic body 120 by vacuum diffusion welding, and covers the second mounting hole 112. A second resistor component 222 is arranged on the surface of the elastic base membrane 221, and the second resistor component 222 is located on the side of the elastic base membrane 221 facing the inner wall of the pipeline 200 to be tested. It can be understood that when gas or fluid passes through the pipeline 200 to be tested and generates pressure on the inner wall of the pipeline 200 to be tested, the pressure will cause the elastic base membrane 221 to deform, thereby causing the bridge in the second resistor component 222 on the surface of the elastic base membrane 221 to be unbalanced, thereby converting the pressure signal of the pipeline 200 to be tested into an electrical signal.

[0102] In one embodiment, the second resistor 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 pipeline 200 to be tested. The four strain resistors 225 are arranged on a side of the third graphene protective 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 protective layer 226 covers a side of the four strain resistors 225 away from the third graphene protective layer 224.

[0103] In this embodiment, the third graphene protective layer 224 and the fourth graphene protective layer 226 can be graphene anti-corrosion and heat dissipation coatings covering the upper and lower surfaces of the four strain resistors 225, which can promote heat dissipation on the resistor surface, protect the resistor, and prevent corrosion damage to the resistor caused by moisture, etc. It can be understood that by coating the upper and lower surfaces of the four strain resistors 225 with high-temperature resistant and corrosion-resistant insulating composite ceramic materials and graphene to form an anti-corrosion coating, it can also meet certain acid-base corrosion and steam environments, and at the same time increase the heat dissipation capacity of the sensor and reduce the error of temperature in measurement.

[0104] In one embodiment, four strain resistors 225 are distributed on the same diameter of the elastic base film 221, the two strain resistors 225 in the middle extend in the direction of the diameter, and the two strain resistors 225 at both ends extend in a direction perpendicular to the diameter. In this embodiment, two of the strain resistors 255 can be distributed near the center of the elastic base film 221, and the remaining two strain resistors 255 can be distributed near the edge of the elastic base film 221.

[0105] In one embodiment, when the pipeline 200 to be tested is subjected to pressure and moves radially outward, the elastic base membrane 221 is recessed away from the center of the circle toward the bottom of the second mounting hole 112. The strain resistors R3 and R4 near the center of the elastic base membrane 221 are stretched and deformed, and the strain resistors R1 and R2 near the edge of the elastic base membrane 221 are compressed and deformed, resulting in the bridge composed of the four strain resistors 255 being unbalanced, so an output voltage can be generated.

[0106] In one embodiment, the pressure sensor 220 also includes a second sealing cover 232, and a second radio frequency circuit is provided at the upper end of the second sealing cover 232, that is, the side of the second sealing cover 232 facing the elastic base membrane 221. In this embodiment, the second radio frequency circuit may include a radio frequency device. Since the four strain resistors 225 are connected in the form of a bridge, the output end of the bridge can be connected to the input end of the radio frequency device, thereby forming an output end of the pressure signal. The bridge formed by the four strain resistors 225 can convert the pressure signal in the pipeline 200 to be tested into an electrical signal, and then transmit the signal to the remote control terminal or the signal receiver through the radio frequency device. Through the signal analysis circuit in the remote control terminal or the signal receiver, the corresponding relationship between the electrical signal and the pressure signal can be obtained, and the pressure measurement of the pipeline 200 to be tested can be achieved according to the preset relationship.

[0107] In one embodiment, the pressure sensor 220 further includes a support plate 227, which is disposed between the elastic base film 221 and the second detection component 223 to prevent the second resistor component 222 from being damaged due to excessive deformation. A support plate 227 is also disposed between the elastic base film 221 and the radio frequency device to prevent the strain resistor 255 from being damaged due to excessive deformation of the elastic base film 221, thereby preventing the pressure sensor 220 from being able to measure pressure.

[0108] In one embodiment, the heating resistor 215, the two thermistors 216 and the four strain resistors 225 can all be designed and manufactured using a microelectromechanical systems (MEMS) process, which has the advantage of miniaturization and can be suitable for use in various micro-installation environments, facilitating integration, thereby expanding the application range of the graphene composite film sensor 100.

[0109] It can be understood that the graphene composite film sensor 100 provided in the present application can avoid the need to destroy the pipeline 200 to be tested (drilling, disconnecting) to achieve the connection between the external sensor and the pipeline 200 to be tested, by installing the flow sensor 210 and the pressure sensor 220 inside the pipeline 200 to be tested through the elastic substrate 10, and using the first radio frequency circuit 219 and the second radio frequency circuit to transmit the flow signal and the pressure signal respectively. The traditional solution maintains the structure and function of the original pipeline 200 to be tested.

[0110] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A pipeline graphene composite film sensor, characterized in that: include: The elastic base is used to abut against the inner wall of the pipe to be tested by utilizing its own deformation; as well as A graphene sensor is arranged on a side of the elastic substrate away from the inner wall of the pipeline to be tested, and is used to detect the flow rate and pressure in the pipeline to be tested; The elastic base is provided with a first mounting hole and a second mounting hole on a side away from the inner wall of the pipeline to be tested; The graphene sensor comprises a flow sensor and a pressure sensor, wherein the flow sensor is arranged at the first mounting hole for measuring the flow of the pipeline to be tested, and the pressure sensor is arranged at the second mounting hole for measuring the pressure of the pipeline to be tested; The flow sensor includes: a sensor base; a first resistor component, which is arranged on a surface of the sensor base away from the inner wall of the pipeline to be measured, and is used to generate a resistance change when the flow in the pipeline to be measured changes; and a first detection component, which is located on a side of the sensor base close to the inner wall of the pipeline to be measured, is electrically connected to the first resistor component, and is used to detect a voltage change across the first resistor component, calculate a resistance change of the first resistor component based on the voltage change, and determine the flow change based on the resistance change of the first resistor component.

2. The pipeline graphene composite film sensor according to claim 1, characterized in that: The elastic base includes at least two elastic bodies, and the at least two elastic bodies are arc-shaped and together form a circular ring structure. The radius of the at least two elastic bodies is greater than the radius of the pipeline to be tested within a preset range.

3. The pipeline graphene composite film sensor according to claim 2, characterized in that: One end of the elastic body is provided with a docking hole, and the other end is provided with a protrusion matched with the docking hole. The elastic body is connected end to end with another elastic body with the same structure along the circumferential direction through the docking hole and the protrusion.

4. The pipeline graphene composite film sensor according to claim 1, characterized in that: The first resistance component comprises: A first graphene protective layer covers the surface of the sensor substrate away from the inner wall of the pipeline to be measured; A heating resistor is arranged on a side of the first graphene protection layer away from the sensor substrate; two thermistors, disposed on a side of the first graphene protection layer away from the sensor substrate and symmetrically about the heating resistor; and The second graphene protection layer covers the heating resistor and a side of the two thermistors away from the first graphene protection layer.

5. The pipeline graphene composite film sensor according to claim 1, characterized in that: The first detection component comprises: a first detection circuit, electrically connected to the first resistor component, for detecting a voltage change across the first resistor component, calculating a resistance change of the first resistor component according to the voltage change, and determining the flow change according to the resistance change of the first resistor component; and The first radio frequency circuit is electrically connected to the first detection circuit and is used to send the flow change to a remote terminal.

6. The pipeline graphene composite film sensor according to claim 1, characterized in that: The pressure sensor comprises: An elastic base membrane covering the second mounting hole; A second resistor component is disposed on a surface of the elastic base film close to the inner wall of the pipeline to be tested, and is used to generate deformation when the pressure in the pipeline to be tested changes; and The second detection component is located on a side of the elastic base membrane close to the inner wall of the pipeline to be tested, and is electrically connected to the second resistor component, and is used to detect the voltage change across the second resistor component, calculate the resistance change of the second resistor component according to the voltage change, and determine the pressure change according to the resistance change of the second resistor component.

7. The pipeline graphene composite film sensor according to claim 6, characterized in that: The second detection component comprises: a second detection circuit, electrically connected to the second resistance component, for detecting a voltage change across the second resistance component, calculating a resistance change of the second resistance component according to the voltage change, and determining the pressure change according to the resistance change of the second resistance component; and The second radio frequency circuit is electrically connected to the second detection circuit and is used to send the pressure change to a remote terminal.

8. The pipeline graphene composite film sensor according to claim 6, characterized in that: The second resistance component comprises: A third graphene protective layer covers the surface of the elastic base film close to the inner wall of the pipeline to be tested; Four strain resistors are arranged on a side of the third graphene protection layer away from the elastic base film, and the four strain resistors are electrically connected to form a bridge circuit; and The fourth graphene protection layer covers a side of the four strain resistors away from the third graphene protection layer.

9. The pipeline graphene composite film sensor according to claim 8, characterized in that: The four strain resistors are distributed on the same diameter of the elastic base film, the two strain resistors in the middle extend in the direction of the diameter, and the two strain resistors at both ends extend in a direction perpendicular to the diameter.

10. The pipeline graphene composite film sensor according to claim 6, characterized in that: The pressure sensor further includes a support plate, which is disposed between the elastic base film and the second detection component and is used to prevent the second resistor component from being damaged due to excessive deformation.

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