CN113137996B - Sectional capacitance sensor and multiphase layered liquid level interface measurement system - Google Patents
Sectional capacitance sensor and multiphase layered liquid level interface measurement system Download PDFInfo
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- CN113137996B CN113137996B CN202110519601.3A CN202110519601A CN113137996B CN 113137996 B CN113137996 B CN 113137996B CN 202110519601 A CN202110519601 A CN 202110519601A CN 113137996 B CN113137996 B CN 113137996B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/265—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
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- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a segmented capacitance sensor and a multi-phase layered liquid level interface measuring system, wherein the sensor comprises a plurality of sensor nodes, each sensor node comprises a segmented capacitance polar plate I, a segmented capacitance polar plate I signal adapter plate, a segmented capacitance detecting circuit, a segmented capacitance polar plate I shell, a segmented capacitance polar plate II signal adapter plate, a segmented capacitance polar plate II shell, a power supply and a communication line, the segmented capacitance polar plate I and the segmented capacitance polar plate II are placed in parallel, a plurality of capacitance electrodes I are arranged on the segmented capacitance polar plate I, a plurality of capacitance electrodes II are arranged on the segmented capacitance polar plate II, the capacitance electrodes I and the capacitance electrodes II are arranged oppositely, and the capacitance electrodes I on the segmented capacitance polar plate I and the capacitance electrodes II of the segmented capacitance polar plate II form a plurality of segmented capacitances. The multiphase layered liquid level interface measurement system is based on the sensor. The invention can solve the problems that the prior capacitance sensor is easy to accumulate crude oil and the electrode plate needs to be reliably sealed.
Description
Technical Field
The invention relates to the field of capacitance type liquid level measurement, in particular to a segmented capacitance sensor and a multiphase layered liquid level interface measurement system based on the segmented capacitance sensor.
Background
The oil extracted from the oil field is a three-phase mixture of oil, gas and water, and the extraction process is accompanied by the existence of silt. Generally, from the top of the tank to the bottom of the tank, crude oil, oil-water emulsion, water and sludge layers are arranged in sequence. In the petroleum exploitation link, the transfer tank, the settling tank, the crude oil dehydrator, the electric dehydrator, the buffer tank, the storage and transportation tank and other links need multi-phase liquid level measurement, so that oil-water separation control is facilitated, and data are provided for mastering the water content of crude oil and the yield of crude oil in the exploitation process.
At present, a plurality of methods for researching oil-water liquid level measurement at home and abroad exist, and the most researched method is a sectional capacitance type measurement method. The method based on the segmented capacitance mainly depends on the principle that capacitance changes caused by dielectric changes, and the measured capacitance value is in linear relation with an interface. A single capacitor cannot distinguish oil-water, oil-gas and emulsion zone multiphase interfaces. The method mainly adopts a sectional type capacitance sensor aiming at the measurement of the multiphase interface of the crude oil, and the sectional type capacitance sensor can distinguish whether each capacitor is positioned in water, the crude oil, an emulsification zone or air according to the numerical value of each capacitor so as to calculate and distinguish the multiphase interface. The segmented capacitance sensor has high measurement precision, low cost and the most extensive research.
The arrangement form of the commonly used segmented capacitance electrode is mainly 3 types:
1. the symmetrical bipolar plate segmented capacitor structure is characterized in that two polar plates of each capacitor are symmetrical and have the same parameters;
2. a segmented capacitor structure including a common electrode;
3. the single-pole sectional capacitor structure adopts the tank body of the crude oil tank as the common electrode of the sectional capacitor.
The height of a crude oil storage tank is usually higher, generally more than 10 meters, and in order to improve the liquid level measurement accuracy as much as possible, a measurement scheme of sectional capacitance measurement is adopted, and the number of capacitors is generally dozens, even possibly hundreds. At present, the scheme for measuring oil-water, an emulsification zone and an oil-gas interface in a crude oil tank based on segmented capacitance has the following main problems:
most current segmented capacitance measurement schemes place the circuit that measures the capacitance outside the tank. Because the number of the segmented capacitors is large, a large number of lead wires are led out to a measuring circuit, and difficulty is brought to installation and maintenance of a measuring system. In addition, the capacitor lead is long, the parasitic capacitance value is large, and the lengths of different capacitor leads are different, so that great inconvenience is brought to measurement and data processing.
In the measurement process of crude oil and other comparatively dirty liquids, if polytetrafluoroethylene materials are not adopted, oil is easily hung on the surface of the segmented capacitance sensor, so that the capacitance value gradually deviates, and the measurement precision is influenced. The polytetrafluoroethylene has good anti-adhesion performance, and can better solve the problem of oil hanging when being used as an insulating material. Almost all glue bonds do not bond polytetrafluoroethylene strongly, which presents sealing difficulties for segmented capacitive sensors based on polytetrafluoroethylene materials.
In order to realize the sealing of the sensor, polytetrafluoroethylene or fluorinated ethylene propylene circular tubes are mostly used as sheaths of the electrodes. The segmented capacitor plates are placed in a polytetrafluoroethylene or fluorinated ethylene propylene circular tube, all the segmented capacitor electrodes are connected to a measuring circuit through leads, and the segmented capacitor plates are made into a ring shape.
At present, most of products utilize a crude oil tank body as another electrode of a capacitor, and the arrangement form of the electrode is a monopole sectional capacitor structure. This type of sensor has two drawbacks: firstly, the shape of the tank body and the position of the sensor can influence the parameters of the sensor, so the parameters of the sensor with the structure need to be calibrated on site. Secondly, because the jar diameter is great, adopt the jar body as the electrode, the precision of sensor receives the influence, if jar internal wall is non-metallic material especially can't realize accurate measurement.
There is also a research proposal that a stainless steel tube is added outside the circular tube to be used as another electrode of the capacitor, the diameter of the stainless steel tube is larger than that of the polytetrafluoroethylene tube, and the stainless steel tube is coaxial with the polytetrafluoroethylene tube. The structure of the capacitor belongs to a segmented capacitor with a common electrode. The disadvantage of using teflon tube to process the sectional capacitance sensor is that when the tank body is large and the sectional capacitance is large, the electrode of each sectional capacitance connects the circuit to the external measurement, the wiring harness is large, and the wiring harness is long, which is very unfavorable for the processing and the calibration of the product.
Disclosure of Invention
The invention aims to solve the technical problems that a sectional capacitance sensor and a multiphase layered liquid level interface measurement system are provided, and the problems that crude oil is easy to accumulate and a plate electrode needs to be reliably sealed in the conventional capacitance sensor can be solved.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: a segmented capacitance sensor comprises a plurality of sensor nodes, wherein each sensor node comprises a segmented capacitance polar plate I, a segmented capacitance polar plate I signal adapter plate, a segmented capacitance detection circuit, a segmented capacitance polar plate I shell, a segmented capacitance polar plate II signal adapter plate, a segmented capacitance polar plate II shell, a power supply and a communication line, the segmented capacitance polar plate I and the segmented capacitance polar plate II are placed in parallel, a plurality of capacitance electrodes I are arranged on the segmented capacitance polar plate I, a plurality of capacitance electrodes II are arranged on the segmented capacitance polar plate II, the capacitance electrodes I and the capacitance electrodes II are arranged oppositely, the capacitance electrodes I and the capacitance electrodes II are identical in number, size and arrangement position, the capacitance electrodes I and the capacitance electrodes II at the same position form a parallel plate capacitor, and the capacitance electrodes I and the capacitance electrodes II on the segmented capacitance polar plate I and the segmented capacitance polar plate II form a plurality of segmented capacitors;
the sectional capacitor electrode plate I, the sectional capacitor electrode plate I signal adapter plate and the sectional capacitor detection circuit are packaged in a sectional capacitor electrode plate I shell, and the capacitor electrode I is connected to the sectional capacitor detection circuit through the sectional capacitor electrode plate I signal adapter plate;
the segmented capacitor electrode plate II and the segmented capacitor electrode plate II signal adapter plate are packaged in the shell of the segmented capacitor electrode plate II, and the capacitor electrode II is connected to the segmented capacitor detection circuit through the segmented capacitor electrode plate II signal adapter plate and a lead;
the power supply and the communication line are connected with the segmented capacitance detection circuit, the power supply and the communication line are led out from the inside of the shell of the segmented capacitance polar plate I to the outside of the shell of the segmented capacitance polar plate I, and the power supply and the communication line realize the cascade connection of a plurality of sensor nodes and the connection of the sensor nodes to a bus.
Furthermore, the shell of the segmented capacitor polar plate I comprises a shell I, the segmented capacitor polar plate I comprises a capacitor electrode I distribution area and a shielding area I, the capacitor electrode I distribution area is arranged in the center of the segmented capacitor polar plate I, the shielding area I surrounds the periphery of the capacitor electrode I distribution area, the single face of the shell I is open, and the shielding area I of the segmented capacitor polar plate I is welded at the opening of the shell I.
Furthermore, the shell of the segmented capacitor polar plate I also comprises a clip frame I, the clip frame I is welded on a shielding area I of the segmented capacitor polar plate I, the segmented capacitor polar plate I welded with the clip frame I is fixed at an opening of the shell I through a bolt, and a sealing gasket is arranged between the segmented capacitor polar plate I and the shell I.
Furthermore, the capacitor electrode I is welded on the front face of the segmented capacitor plate I, the segmented capacitor plate I signal adapter plate and the segmented capacitor detection circuit are welded on the back face of the segmented capacitor plate I, a glue injection port is formed in the shell I, and after the segmented capacitor plate I is connected to the shell I, the shell I is filled with sealant through the glue injection port.
Further, segmentation capacitor plate II shell includes casing II, and segmentation capacitor plate II includes capacitor electrode II distribution area and shield area II, and capacitor electrode II distribution area sets up in segmentation capacitor plate II's central authorities, and shield area II encircles around capacitor electrode II distribution area, casing II single face opening, and segmentation capacitor plate II's shield area II welds at casing II's opening part.
Further, the shell of the segmented capacitor plate II further comprises a clip frame II, the clip frame II is welded on a shielding area II of the segmented capacitor plate II, the segmented capacitor plate II welded with the clip frame II is fixed at an opening of the shell II through a bolt, and a sealing gasket is arranged between the segmented capacitor plate II and the shell II.
Further, capacitance electrode II welds in segmentation capacitance polar plate II's front, and segmentation capacitance polar plate II signal keysets welds in segmentation capacitance polar plate II's the back, is equipped with the injecting glue mouth on casing II, and segmentation capacitance polar plate II connects the back on casing II, fills up sealed glue in to casing II through the injecting glue mouth.
Furthermore, the shell of the segmented capacitor plate I and the shell of the segmented capacitor plate II are both made of metal.
Furthermore, the segmented capacitor electrode plate I and the segmented capacitor electrode plate II are made of one of FR-4 plates, aluminum substrates and polytetrafluoroethylene circuit boards.
Furthermore, the segmented capacitor polar plate I and the segmented capacitor polar plate II are polytetrafluoroethylene circuit boards, and the polytetrafluoroethylene circuit boards are polytetrafluoroethylene material and copper foil laminated boards.
The invention also discloses a multiphase layered liquid level interface measuring system, which comprises a liquid level interface sensor, a bus communication interface and a monitoring host, wherein the liquid level interface sensor is the segmented capacitance sensor, and a plurality of sensor nodes of the segmented capacitance sensor are arranged in the crude oil storage tank and distributed along the height direction of the crude oil storage tank; a plurality of sensor nodes of the segmented capacitance sensor are connected to a bus communication interface through a bus, and the bus communication interface is connected with a monitoring host.
The invention has the beneficial effects that: the segmented capacitor is divided into a plurality of nodes, the measuring circuit is sealed in the sensor nodes, the capacitor signals are converted into digital signals to be output to a communication bus, a large number of wire harnesses are reduced, the measuring wire harnesses are prevented from being connected to the outside, and the measured data are more stable and reliable.
The adopted structure and the bus communication form enable the sensor nodes to be freely increased according to the height of the tank body. The sensor is convenient to process, produce and install.
The sensor adopts polytetrafluoroethylene board (not pipe) as the insulating layer, and polytetrafluoroethylene and copper foil pressfitting are in the same place, and polytetrafluoroethylene can solve the sensor surface and hang oily problem.
The sensor structurally solves the problem that a polytetrafluoroethylene plate (not a polytetrafluoroethylene tube scheme) is difficult to seal, and the formed bipolar plate sectional capacitance measuring scheme has higher precision than a unipolar plate scheme. In the sensor, the polytetrafluoroethylene segmented capacitance polar plate and the detection circuit board adopt adapter plate leads. The lead connection is reliable, the processing is simple and the cost is low.
Drawings
FIG. 1 is a schematic diagram of a single sensor node;
FIG. 2 is an external structural diagram of a single sensor node;
FIG. 3 is a schematic diagram of an explosive structure of a single sensor node;
FIG. 4 is a schematic diagram of a segmented capacitor plate I;
FIG. 5 is a schematic diagram of a segmented capacitor plate I signal patch panel;
FIG. 6 is a functional block diagram of a liquid level interface measurement system;
in the figure: 1. segmented capacitance polar plate I,2, segmented capacitance polar plate I signal adapter plate, 3, segmented capacitance detection circuit, 4, segmented capacitance polar plate I shell, 5, segmented capacitance polar plate II,6, segmented capacitance polar plate II signal adapter plate, 7, segmented capacitance polar plate II shell, 8, capacitance electrode I,9, capacitance electrode II,10, power supply and communication line, 13, capacitance electrode I distribution area, 14, shielding area I,15, round hole, 16, copper foil, 17, bonding pad, 18, sealing gasket I,19, clip frame I,20, detection circuit insulating gasket, 21, clip frame II,22, sealing gasket II.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The embodiment discloses a sectional capacitive sensor, which comprises a plurality of sensor nodes, wherein as shown in fig. 1, 2 and 3, each sensor node comprises a sectional capacitive pole plate I1, a sectional capacitive pole plate I signal adapter plate 2, a sectional capacitance detection circuit 3, a sectional capacitive pole plate I shell 4, a sectional capacitive pole plate II5, a sectional capacitive pole plate II signal adapter plate 6, a sectional capacitive pole plate II shell 7 and a power supply and communication line 10.
Sectional capacitance polar plate I1 and sectional capacitance polar plate II5 parallel placement, be equipped with a plurality of capacitance electrode I8 on the sectional capacitance polar plate I1, a plurality of capacitance electrode II9 on the sectional capacitance polar plate II5, capacitance electrode I8 sets up with capacitance electrode II9 relatively, and capacitance electrode I8 is equal the same in quantity, size, arrangement position with capacitance electrode II9, the capacitance electrode I8 and the capacitance electrode II9 of the same position form a parallel plate electric capacity, capacitance electrode I8 on the sectional capacitance polar plate I1 and the capacitance electrode II9 of sectional capacitance polar plate II 6 form a plurality of sectional electric capacities. The space between segmented capacitive plate I1 and segmented capacitive plate II5 is referred to as the dielectric space.
Subsection capacitance polar plate I1, subsection capacitance polar plate I signal keysets 2, subsection capacitance detection circuitry 3 encapsulate in subsection capacitance polar plate I shell 4, and capacitance electrode I8 is connected to subsection capacitance detection circuitry 3 through subsection capacitance polar plate I signal keysets 2.
The segmented capacitor plate II5 and the segmented capacitor plate II signal adapter plate 6 are packaged in the segmented capacitor plate II shell 7, and the capacitor electrode II9 is connected to the segmented capacitor detection circuit 3 through the segmented capacitor plate II signal adapter plate 6 and a lead. In this embodiment, the lead connected between the signal adapter board 6 of the segmented capacitor plate II and the segmented capacitor detection circuit 3 is a multi-core shielding wire, and the electrodes on the segmented capacitor plate II5 are connected to the capacitor detection circuit in the housing 4 of the segmented capacitor plate I through the lead interfaces of the segmented capacitor plate II by using the multi-core shielding wire.
The power supply and communication line 10 is connected with the segmented capacitance detection circuit 3, the power supply and communication line 10 is led out from the inside of the segmented capacitance plate I shell 4 to the outside of the segmented capacitance plate I shell 4, and the power supply and communication line 10 realizes the cascade connection of a plurality of sensor nodes and the connection of the sensor nodes to a bus. As shown in fig. 2 and 3, the power and communication line 10 of the present embodiment includes a first power and communication line 11 and a second power and communication line 12, one of which is used for connecting a power supply and a bus, and the other is used for connecting the power supply and the bus to the next sensor node, so as to facilitate the cascading of the sensor nodes. Cascading of nodes may also be accomplished using a connector capable of cascading, where only one power communication line is required for the sensor node.
The shell of the segmented capacitor plate I comprises a shell I, as shown in fig. 4, the segmented capacitor plate I comprises a capacitor electrode I distribution area 13 and a shielding area I14, the capacitor electrode I distribution area 14 is arranged in the center of the segmented capacitor plate I, the shielding area I14 surrounds the periphery of the capacitor electrode I distribution area 13, the single surface of the shell I is open, and the shielding area I14 of the segmented capacitor plate I is welded at the opening of the shell I. The shielding area I14 plays a role in shielding external interference on one hand, and is connected with the shell I in a soldering tin welding mode on the other hand, so that the connection strength is high, and the sealing performance is good. The round hole 15 is the fixed mounting hole, and the quantity of fixed mounting hole 15 can increase or reduce according to actual conditions, if the good welding of metal shielding layer all around to metal casing, can not add the fixed mounting hole this moment.
The fixed mounting holes are arranged to enable connection to be firmer, as shown in fig. 3, the segmented capacitor plate I shell 4 further comprises a clip frame I19, the clip frame I19 is welded on a shielding area I14 of the segmented capacitor plate I, the segmented capacitor plate I1 welded with the clip frame I19 is fixed at an opening of the shell I through bolts, and a sealing gasket I18 is arranged between the segmented capacitor plate I1 and the shell I. As shown in fig. 5, the signal adapter plate 2 of the capacitor plate I can be attached to the segmented capacitor plate, and the square on the adapter circuit board is a copper foil 16 with a size smaller than that of the capacitor electrode, and is attached to the capacitor substrate for increasing the contact area. The round part in the square block is a bonding pad 17 with a round hole, the bonding pad 17 is welded to the capacitor electrodes through soldering tin, and all the capacitor electrodes are switched to an interface which is easier to wire or connect with the segmented capacitor detection circuit through a signal switching board.
Capacitance electrode I8 welds in segmentation capacitance polar plate I1's front, segmentation capacitance polar plate I signal keysets 2 pastes at segmentation capacitance polar plate I1's back, segmentation capacitance polar plate I1 and segmentation capacitance polar plate I signal keysets 2 that assemble together pass through plug connector or lead connection to segmentation electric capacity detection circuitry 3, be equipped with the injecting glue mouth on the casing I, segmentation capacitance polar plate I1 connects the back on casing I, fill up sealed glue through the injecting glue mouth to casing I in.
In this embodiment, the front surface of the segmented capacitor plate I1 refers to a surface of the segmented capacitor plate I1 facing the dielectric space, and the back surface of the segmented capacitor plate I1 refers to a surface of the segmented capacitor plate I facing the inside of the housing I.
Similarly, segmentation capacitor plate II shell 7 includes casing II, and segmentation capacitor plate II5 includes capacitor electrode II distribution area and shield area II, and capacitor electrode II distribution area sets up in segmentation capacitor plate II's central authorities, and shield area II encircles around capacitor electrode II distribution area, casing II single face opening, and segmentation capacitor plate II's shield area II welds at casing II's opening part.
The segmented capacitor plate II shell further comprises a clip frame II21, the clip frame II21 is welded on a shielding area II of the segmented capacitor plate II5, the segmented capacitor plate II5 welded with the clip frame II21 is fixed at an opening of the shell II through a bolt, and a sealing gasket II22 is arranged between the segmented capacitor plate II and the shell II.
Capacitance electrode II9 welds in segmentation capacitance polar plate II 5's front, and segmentation capacitance polar plate II signal keysets 6 pastes at segmentation capacitance polar plate II 5's back, is equipped with the injecting glue mouth on casing II, and segmentation capacitance polar plate II5 is connected the back on casing II, fills up sealed glue in to casing II through the injecting glue mouth.
The front surface of the segmented capacitor plate II5 refers to one surface of the segmented capacitor plate II5 facing the dielectric space, and the back surface of the segmented capacitor plate II5 refers to one surface of the segmented capacitor plate II5 facing the inside of the shell II.
In this embodiment, the casing of the segmented capacitor plate I and the casing of the segmented capacitor plate II are made of metal, so as to shield external interference signals.
The segmented capacitor electrode plate I1 and the segmented capacitor electrode plate II5 are made of one of FR-4 plates, aluminum substrates and polytetrafluoroethylene circuit boards.
Specifically, the segmented capacitor polar plate I1 and the segmented capacitor polar plate II5 are polytetrafluoroethylene circuit boards, the polytetrafluoroethylene circuit boards are polytetrafluoroethylene materials and copper foil laminated boards, the polytetrafluoroethylene circuit boards are processed by the same etching method as the PCB circuit boards, and the processing precision is high.
In order to prevent corrosion and to avoid the measured liquid level from affecting the measured value of the capacitance, the capacitive electrodes must be reliably insulated and sealed. The insulating material can prevent the sensor from being corroded and avoid oil if polytetrafluoroethylene (or polytetrafluoroethylene-based material such as polytetrafluoroethylene and glass fiber mixture) is adopted. However, the polytetrafluoroethylene used as the segmented capacitor plate has the problems that the polytetrafluoroethylene has strong non-adhesiveness, and can hardly be firmly adhered with any glue, so that the sensor is difficult to seal, especially for a parallel plate type sensor. The segmented capacitance sensor is a parallel plate type sensor and is simple in structure, polytetrafluoroethylene is used as a segmented capacitance polar plate, and the segmented capacitance polar plate is welded or fixed on a sensor shell through a bolt, so that the problem that the sensor is corroded due to oil hanging is solved, and the sealing reliability of the sensor can be guaranteed.
Example 2
The embodiment discloses a multiphase layered liquid level interface measurement system, as shown in fig. 6, which comprises a liquid level interface sensor, a bus communication interface and a monitoring host, wherein the liquid level interface sensor is the segmented capacitance sensor described in embodiment 1, and a plurality of sensor nodes of the segmented capacitance sensor are arranged in a crude oil storage tank and distributed along the height direction of the crude oil storage tank; a plurality of sensor nodes of the segmented capacitance sensor are connected to a bus communication interface through a bus, the bus communication interface is connected with a monitoring host, and the monitoring host analyzes the height of the oil, water and oil-water mixture in the tank according to received capacitance data.
The segmented capacitance detection circuit can detect segmented capacitances of all the nodes and convert capacitance data into digital signals. The segmented capacitance detection circuit sends the digital signal to the outside through a communication bus, and the bus CAN be a CAN bus, an RS-485 bus and the like. All nodes in the system can be hung on the bus, so that the external wiring of the whole system only needs a power supply positive electrode, a power supply negative electrode, a communication bus and a common polar plate lead, and the common polar plate lead can also be connected with the power supply negative electrode according to different capacitance detection circuits.
The foregoing description is only for the purpose of illustrating the general principles and preferred embodiments of the present invention, and it is intended that modifications and substitutions be made by those skilled in the art in light of the present invention and that they fall within the scope of the present invention.
Claims (9)
1. A segmented capacitive sensor, comprising: the segmented capacitor comprises a segmented capacitor plate I, a segmented capacitor plate I signal adapter plate, a segmented capacitor detection circuit, a segmented capacitor plate I shell, a segmented capacitor plate II signal adapter plate, a segmented capacitor plate II shell, a power supply and a communication line, wherein the segmented capacitor plate I and the segmented capacitor plate II are arranged in parallel, a plurality of capacitor electrodes I are arranged on the segmented capacitor plate I, a plurality of capacitor electrodes II are arranged on the segmented capacitor plate II, the capacitor electrodes I and the capacitor electrodes II are arranged oppositely, the number, the size and the arrangement positions of the capacitor electrodes I and the capacitor electrodes II are the same, the capacitor electrodes I and the capacitor electrodes II at the same position form a parallel plate capacitor, and the capacitor electrodes I on the segmented capacitor plate I and the capacitor electrodes II of the segmented capacitor plate II form a plurality of segmented capacitors;
the segmented capacitor electrode plate I, the signal adapter plate of the segmented capacitor electrode plate I and the segmented capacitor detection circuit are packaged in a shell of the segmented capacitor electrode plate I, and the capacitor electrode I is connected to the segmented capacitor detection circuit through the signal adapter plate of the segmented capacitor electrode plate I;
the segmented capacitor electrode plate II and the segmented capacitor electrode plate II signal adapter plate are packaged in the shell of the segmented capacitor electrode plate II, and the capacitor electrode II is connected to the segmented capacitor detection circuit through the segmented capacitor electrode plate II signal adapter plate and a lead;
the power supply and the communication line are connected with the segmented capacitance detection circuit and are led out from the inside of the shell of the segmented capacitance polar plate I to the outside of the shell of the segmented capacitance polar plate I;
the power supply and the communication line realize the connection of the sensor nodes to the bus, and can realize the cascade connection of a plurality of sensor nodes to form more segmented capacitance measuring systems;
the shell of the segmented capacitor polar plate I comprises a shell I, the segmented capacitor polar plate I comprises a capacitor electrode I distribution area and a shielding area I, the capacitor electrode I distribution area is arranged in the center of the segmented capacitor polar plate I, the shielding area I surrounds the periphery of the capacitor electrode I distribution area, the shell I is provided with an opening on one side, and the shielding area I of the segmented capacitor polar plate I is welded at the opening of the shell I; segmentation capacitor plate II shell includes casing II, and segmentation capacitor plate II includes capacitor electrode II distribution district and shield area II, and capacitor electrode II distribution district sets up in segmentation capacitor plate II's central authorities, and shield area II encircles around capacitor electrode II distribution district, and casing II single face opening, segmentation capacitor plate II's shield area II welding is at casing II's opening part.
2. The segmented capacitive sensor of claim 1 wherein: the shell of the segmented capacitor polar plate I also comprises a clip frame I, the clip frame I is welded on a shielding area I of the segmented capacitor polar plate I, the segmented capacitor polar plate I welded with the clip frame I is fixed at an opening of the shell I through a bolt, and a sealing gasket is arranged between the segmented capacitor polar plate I and the shell I.
3. The segmented capacitive sensor of claim 1 or 2 wherein: capacitance electrode I welds in segmentation capacitance polar plate I's front, and segmentation capacitance polar plate I signal keysets pastes at segmentation capacitance polar plate I's back, and segmentation capacitance polar plate I signal keysets assembled together pass through plug connector or pin connection to segmentation capacitance detection circuitry, are equipped with the injecting glue mouth on the casing I, and segmentation capacitance polar plate I connects the back on the casing I, fills up sealed glue in to casing I through the injecting glue mouth.
4. The segmented capacitive sensor of claim 1, wherein: the shell of the segmented capacitor polar plate II further comprises a clip frame II, the clip frame II is welded on a shielding area II of the segmented capacitor polar plate II, the segmented capacitor polar plate II welded with the clip frame II is fixed at the opening of the shell II through a bolt, and a sealing gasket is arranged between the segmented capacitor polar plate II and the shell II.
5. The segmented capacitive sensor of claim 1 or 4 wherein: capacitor electrode II welds in segmentation capacitor plate II's front, and segmentation capacitor plate II signal keysets pastes at segmentation capacitor plate II's the back, is equipped with the injecting glue mouth on casing II, and segmentation capacitor plate II connects the back on casing II, fills up sealed glue in to casing II through the injecting glue mouth.
6. The segmented capacitive sensor of claim 1, wherein: the shell of the segmented capacitor plate I and the shell of the segmented capacitor plate II are both made of metal.
7. The segmented capacitive sensor of claim 1, wherein: the segmented capacitor electrode plate I and the segmented capacitor electrode plate II are made of one of FR-4 plates, aluminum substrates and polytetrafluoroethylene circuit boards.
8. The segmented capacitive sensor of claim 7, wherein: the segmented capacitor polar plate I and the segmented capacitor polar plate II are polytetrafluoroethylene circuit boards, and the polytetrafluoroethylene circuit boards are formed by high-temperature pressing of polytetrafluoroethylene materials and copper foils.
9. A multiphase layered liquid level interface measurement system is characterized in that: the system comprises a liquid level interface sensor, a bus communication interface and a monitoring host, wherein the liquid level interface sensor is the segmented capacitance sensor disclosed in claim 1, and a plurality of sensor nodes of the segmented capacitance sensor are arranged in a crude oil storage tank and distributed along the height direction of the crude oil storage tank; a plurality of sensor nodes of the sectional capacitance sensor are connected to a bus communication interface through a bus, and the bus communication interface is connected with a monitoring host.
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