CN102128662B - Segmental capacitor type continuous liquid level sensor - Google Patents
Segmental capacitor type continuous liquid level sensor Download PDFInfo
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- CN102128662B CN102128662B CN2010106238087A CN201010623808A CN102128662B CN 102128662 B CN102128662 B CN 102128662B CN 2010106238087 A CN2010106238087 A CN 2010106238087A CN 201010623808 A CN201010623808 A CN 201010623808A CN 102128662 B CN102128662 B CN 102128662B
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Abstract
The invention relates to a segmental capacitor type continuous liquid level sensor, and in particular relates to a capacitor type sensor for measuring continuous liquid level. Inner electrodes, outer electrodes, a connection bush, coupling screws, soldering flakes, a cable and a digital processor are arranged in the sensor, wherein the outer electrodes are divided into an odd group and an even group; the soldering flakes are riveted on the outer electrodes through rivets, used for connecting the cable, and connected in series with the odd group and the even group respectively; the outer electrodes are sequentially connected together through the connection bush and fixed by use of the coupling screws; the inner electrodes and the outer electrodes are concentrically mounted to form an annular capacitor, namely the segmental capacitor; and the signals of the segmental capacitor sensor are processed by the digital processor which outputs the liquid level height. The sensor provided by the invention has the advantages of high measurement resolution, wide measurement range, fast dynamic response and the like, realizes automatic calibration and saves zero setting.
Description
Technical field
The present invention relates to a kind of device that is used for measuring liquid level, relate in particular to the sensor of the continuous liquid level of a kind of measurement by capacitance, belong to sensor technical field.
Background technology
The liquid level parameter is one of important parameter in a plurality of fields such as Aeronautics and Astronautics.For liquid rocket, in rocket propulsion system, the situation of change of propellant liquid level is the basis of Propellant Management and regulation and control in the rocket flight process.In test or filling process, need the liquid level parameter of propellant tank is measured in real time.The liquid level parameters relationship is to measurement, the measurement of propellant surplus and the control of propellant depleted shutdown of propellant adding amount; Simultaneously, the liquid level parameter also is the underlying parameter that rocket utilizes system works.Therefore, must measure the liquid level of propellant.
At present, the level measuring method of domestic liquid rocket mainly contains three kinds, a kind of level gauging that is based on photovoltaic principals; Another kind is based on the point type level gauging of dried spring principle; The third is based on the continuous level gauging of capacitance principle.Because the different and raw-material restriction of measuring method and measuring object, above-mentioned preceding two kinds of methods are applicable to the level gauging of conventional propellant, for suitable the third method that adopts of the level gauging of cryogenic propellant in the rocket.The capacitance type liquid level measuring method is to have different specific inductive capacity according to different media, and when level change, specific inductive capacity changes, and causes electric capacitance change, thereby causes that sensor sinks to the ratio variation of the height of medium, realizes the measurement of liquid level with this.
Along with carrying out of carrier rocket development work of new generation, the consumption of carrier rocket cryogenic propellant of new generation is big, and the range of fuel tank is big; Characteristics such as and propellant has environment abominable on the rocket, and vibration is strong, and temperature is low.So improved the difficulty of level gauging greatly, so must propose a kind ofly to work at low temperatures, reliable operation, measurement mechanism that measuring accuracy is high.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, provide a kind of merogenesis condenser type continuous liquid level sensor, this sensor is applicable to that cryogenic liquid is measured and reliability is high, good stability, and resolution is high, is applicable to continuous liquid level measuring.
Above-mentioned advantage of the present invention is achieved through following technical scheme:
The continuous liquid level sensor of a kind of merogenesis condenser type; Comprise interior electrode, external electrode, connection lining, weld tabs and cable, external electrode is divided into odd number group electrode and even sets electrode, and the odd number group electrode is parallelly connected as strange electrode; With the parallel connection of even sets electrode as even electrode; Three terminal capacitor of the common formation of strange electrode, even electrode and interior electrode, wherein strange electrode and interior electrode form the odd number capacitance group, and even electrode and interior electrode form the even number capacitance group; Each electrode in the external electrode is connected with cable through weld tabs, and connects through connecting lining between each electrode in the external electrode.
In the continuous liquid level sensor of above-mentioned merogenesis condenser type; Connecting lining is the cylindrical structural that has step in the middle cavity; The a plurality of through holes of circle distribution in the cylinder side wall upper edge, and cylinder side wall radially be 90 ° of four threaded holes that evenly distribute, wherein threaded hole be about two-layer totally eight.
In the continuous liquid level sensor of above-mentioned merogenesis condenser type, respectively to get a threaded hole in the two-layer up and down threaded hole and be fixedly connected with adjacent two external electrodes respectively through screw, all the other six threaded holes are used for water conservancy diversion.
In the continuous liquid level sensor of above-mentioned merogenesis condenser type, the number of external electrode and the relation of transducer range are following:
S＝[2N·L+δ·(2N-1)]
Wherein: S is the range of sensor, and 2N is the number of external electrode, and L is the length of single external electrode, and δ is an external electrode internode dead band length.
In the continuous liquid level sensor of above-mentioned merogenesis condenser type, many sensor series connection are joined and are measured, and realize the measurement of wide range liquid level; Measurement range is: nS+ (n-1) H; Wherein n is the radical of sensor, and H is sensor root measurements dead band, and S is the range of sensor.
In the continuous liquid level sensor of above-mentioned merogenesis condenser type, the two ends up and down of single external electrode are 90 ° respectively and are evenly distributed with four through holes, and wherein up and down two ends are respectively got a through hole and are used for and are connected the lining fixed connection, and all the other six through holes are used for water conservancy diversion.
The present invention compared with prior art has following advantage:
(1) external electrode in the sensor of the present invention is divided into odd number group electrode and even sets electrode; The odd number group electrode is parallelly connected as strange electrode; With the parallel connection of even sets electrode as even electrode; Three terminal capacitor of the common formation of strange electrode, even electrode and interior electrode, the structural design of this merogenesis electric capacity improves the level gauging scope greatly, can also when measuring, many sensor series connection be used with the increase useful range as required simultaneously;
(2) segmented design in the sensor of the present invention can self calibration, exempt from zeroing; Because very, even number capacitance group working environment is in full accord; So sensor itself can self-correcting; After every group of strange, even number capacitance section work was accomplished, the error of the last period will once be eliminated, thereby can be totally produces bigger cumulative errors to next stage;
(3) sensor of the present invention has adopted 2N joint merogenesis electric capacity to test, and as far as gamut, its resolution is original 2N times, has improved Measurement Resolution greatly;
(4) sensor of the present invention is a structural type transducer, does not have any electron device, is applicable to the measurement of cryogenic liquid height;
(5) the connection lining of sensor of the present invention is provided with pod apertures and carries out liquid guide flow, realizes the quick response of level gauging, and connects in the cavity of lining and be provided with step, is used to realize the assurance of electrode gap between external electrode and the interior electrode, has improved measuring accuracy;
(6) the connection lining sidewall of sensor of the present invention is provided with attachment screw, is used for fastening external electrode, prevents that external electrode from rotating, and is applicable to that the liquid level of characteristics such as the rocket body fierceness is vibrated, level change speed is fast is measured.
Description of drawings
Fig. 1 is the structural representation of sensor of the present invention;
Fig. 2 connects the partial enlarged drawing of lining for sensor of the present invention;
Fig. 3 is the sectional view of sensor of the present invention;
Fig. 4 is Fundamentals of Sensors figure of the present invention;
Fig. 5 is for connecting the lining synoptic diagram in the sensor of the present invention;
Fig. 6 is for connecting lining A-A sectional view in the sensor of the present invention;
Fig. 7 is for connecting lining B-B sectional view in the sensor of the present invention;
Fig. 8 is external electrode synoptic diagram in the sensor of the present invention;
Fig. 9 is many sensor string translocations of a present invention amount synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed explanation:
Be illustrated in figure 1 as the structural representation of sensor of the present invention; By electrode 1, external electrode 2, connection lining 4, weld tabs 5 and cable 6 in but sensor comprises in the invention of figure knowledge capital; Interior electrode 1 is a metal material of the same race with external electrode 2; External electrode 2 internal diameters are bigger, length is shorter, and interior electrode 1 external diameter is smaller, length is long.Interior electrode 1 forms with external electrode 2 concentric installations, and the annular between the two circularizes electric capacity.The external electrode 2 number mothers of merogenesis capacitive transducer are even number, and number is made as 2N, make in the present embodiment that N is 5, totally 10 external electrodes 2.The merogenesis capacitive transducer wherein the 1st, 3,5 ... An electrode is drawn in 9 joint parallel connections; Be strange electrode; 2,4,6 ... Another utmost point is drawn in 10 joint parallel connections, is even electrode, these two electrodes and public three terminal capacitor of interior electrode 1 common formation; Strange electrode and interior electrode 1 form the odd number capacitance group, and even electrode and interior electrode 1 form the even number capacitance group.Be illustrated in figure 3 as the sectional view of sensor of the present invention.
Each electrode in the external electrode 2 is connected with cable 6 through weld tabs 5, and connects through connecting lining 4 between each electrode in the external electrode 2, is illustrated in figure 2 as the partial enlarged drawing that sensor of the present invention connects lining.
Be illustrated in figure 4 as Fundamentals of Sensors figure of the present invention; The continuous liquid level sensor principle of work of merogenesis condenser type is following: during the level change of the annular gap between odd number capacitance group or even number capacitance group; Change with specific inductive capacity; Cause electric capacitance change, thereby cause that sensor sinks to the ratio variation of the height of medium, realizes the measurement of liquid level with this.
Be illustrated in figure 5 as and connect the lining synoptic diagram in the sensor of the present invention; Shown in Figure 6 for connecting lining A-A sectional view in the sensor of the present invention, shown in Figure 7 for connecting lining B-B sectional view in the sensor of the present invention, connect lining 4 for having the cylindrical structural of step 10 in the middle cavity 11 by scheming to know; The a plurality of through holes 9 of circle distribution in the cylinder side wall upper edge; Be 12 through holes in the present embodiment, and cylinder side wall radially be 90 ° of four threaded holes 8 that evenly distribute, wherein threaded hole 8 be about two-layer totally eight; Respectively get a threaded hole wherein in the two-layer threaded hole 8 and be fixedly connected with adjacent two external electrodes 2 respectively through screw 3, all the other six threaded holes 8 are used for water conservancy diversion.
As shown in Figure 2; The interior step 10 of cavity that connects lining 4 withstands interior electrode 1; Prevent that the bigger interior electrode 1 of length from use shaking; Guarantee the electrode gap between external electrode 2 and the interior electrode 1, improved measuring accuracy, each electrode in the external electrode 2 is connected with cable 6 through weld tabs 5.
Be illustrated in figure 8 as external electrode synoptic diagram in the sensor of the present invention; The two ends up and down of single external electrode 2 are 90 ° respectively and are evenly distributed with four through holes 12; Wherein up and down two ends are respectively got a through hole 12 and are used for and the threaded hole that is connected lining 48 fixed connections, and all the other six through holes 12 are connected with six threaded holes 8 that are connected lining 4 and are used for water conservancy diversion.
Be illustrated in figure 9 as many sensor string translocations of the present invention amount synoptic diagram; In the actual measurement; If the range of propellant tank is too big, because manufacturing process, single sensor can not satisfy the demand of measured medium liquid level wide range; Can be connected in series through the merogenesis capacitive transducer of many basic inventions and measure, to realize the measurement of arbitrary height, wide range liquid level.Range according to every sensor is (2000+9 δ) mm, if 3 sensor string translocation amounts, then total range is that (mm of 6000+27 δ+2H), wherein H is a sensor root measurements dead band length.
As shown in Figure 1, sensor also comprises the digital processing unit 7 that is connected with cable 6, and digital processing unit 7 is judged the residing external electrode joint number of measured medium liquid level through the capacitance signal of merogenesis capacitive transducer, and then converts joint number into liquid level.According to the characteristics of segment type capacitive liquid level sensor self, when liquid level rises or descends, strange, even merogenesis units alternately contact medium; Its electric capacity alternately changes; Strange for this reason, even electric capacity difference can generate the output of triangular wave characteristic, through behind the chromacoder, produces the change in voltage with triangular wave characteristic; Utilize triangular wave liquid level computing method to calculate liquid level, realize the continuous coverage of liquid level.This method liquid level computational accuracy is higher, and triangular wave has been represented the absolute position of true liquid level, and different triangular waves represented diverse location, and the liquid level error of calculation is not accumulated, and therefore has the self-correcting function.In addition, the flex point of output triangular wave just in time is the interphase that adjacent two economize on electricitys are held, and these flex points become the calibration point of liquid level gauge itself, so the measuring accuracy of merogenesis capacitance level transducer is very high, not influenced by range.
The above; Be merely an instance of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
The content of not doing to describe in detail in the instructions of the present invention belongs to this area professional and technical personnel's known technology.
Claims (6)
1. continuous liquid level sensor of merogenesis condenser type; It is characterized in that: comprise interior electrode (1), external electrode (2), connect lining (4), weld tabs (5) and cable (6); External electrode (2) is divided into odd number group electrode and even sets electrode; As strange electrode, as even electrode, said strange electrode, even electrode and interior electrode (1) constitute a three terminal capacitor jointly with the parallel connection of said even sets electrode with said odd number group electrode parallel connection; Wherein strange electrode and interior electrode (1) form the odd number capacitance group; Idol electrode and interior electrode (1) form the even number capacitance group, and each electrode in the external electrode (2) is connected with cable (6) through weld tabs (5), and connect through connecting lining (4) between each electrode in the external electrode (2).
2. the continuous liquid level sensor of a kind of merogenesis condenser type according to claim 1; It is characterized in that: said connection lining (4) is for having the cylindrical structural of step (10) in the middle cavity (11); The a plurality of through holes of circle distribution (9) in the cylinder side wall upper edge; And cylinder side wall radially be 90 ° of four threaded holes (8) that evenly distribute, wherein threaded hole (8) be about two-layer totally eight.
3. the continuous liquid level sensor of a kind of merogenesis condenser type according to claim 2; It is characterized in that: respectively get a threaded hole in the said two-layer threaded hole (8) up and down and be fixedly connected with adjacent two external electrodes (2) respectively through screw (3), all the other six threaded holes (8) are used for water conservancy diversion.
4. the continuous liquid level sensor of a kind of merogenesis condenser type according to claim 1 is characterized in that: the number of said external electrode (2) and the relation of transducer range are following:
S＝[2N·L+δ·(2N-1)]
Wherein: S is the range of sensor, and 2N is the number of external electrode, and L is the length of single external electrode, and δ is an external electrode internode dead band length.
5. the continuous liquid level sensor of the described a kind of merogenesis condenser type of claim 1; It is characterized in that: many said sensor series connection are joined and are measured; Realize the measurement of wide range liquid level, measurement range is: nS+ (n-1) H, and wherein n is the radical of sensor; H is sensor root measurements dead band, and S is the range of sensor.
6. the continuous liquid level sensor of a kind of merogenesis condenser type according to claim 1; It is characterized in that: the two ends up and down of single said external electrode (2) are 90 ° respectively and are evenly distributed with four through holes (12); Wherein up and down two ends are respectively got a through hole (12) and are used for and are connected lining (4) fixed connection, and all the other six through holes are used for water conservancy diversion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106238087A CN102128662B (en) | 2010-12-31 | 2010-12-31 | Segmental capacitor type continuous liquid level sensor |
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| CN2010106238087A CN102128662B (en) | 2010-12-31 | 2010-12-31 | Segmental capacitor type continuous liquid level sensor |
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| CN102128662A CN102128662A (en) | 2011-07-20 |
| CN102128662B true CN102128662B (en) | 2012-08-22 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202012000569U1 (en) * | 2012-01-20 | 2013-04-23 | Seuffer Gmbh & Co.Kg | Sensor device for detecting liquid properties |
| CN103913207B (en) * | 2014-03-24 | 2017-02-22 | 郑州科达自动化工程有限公司 | High-precision variable-scan oil level measurement sensor with matrix capacitor |
| CN105091988B (en) * | 2014-05-15 | 2019-04-02 | 上海航天设备制造总厂 | The calibrating installation and calibration method of ultralow temperature liquid level sensor |
| CN104330135B (en) * | 2014-10-23 | 2017-09-29 | 北京遥测技术研究所 | A kind of continuous liquid level analog simulation method |
| CN105806443B (en) * | 2014-12-30 | 2022-04-19 | 北京强度环境研究所 | Liquid level measuring system of shaking test storage tank |
| CN106289451B (en) * | 2016-07-27 | 2019-01-18 | 上海航天设备制造总厂 | Merogenesis condenser type low temperature liquid-level converter |
| CN106092262B (en) * | 2016-07-29 | 2019-05-31 | 上海航天设备制造总厂 | Device for low-temperature insulation medium continuous liquid level measuring |
| CN107014454A (en) * | 2016-11-29 | 2017-08-04 | 北京航天试验技术研究所 | A kind of method for calculating cryogenic media steady state flow |
| CN107246899A (en) * | 2017-07-11 | 2017-10-13 | 西安航天动力试验技术研究所 | A kind of triangular wave altitude signal processing method and system |
| CN107313878B (en) * | 2017-07-21 | 2018-12-04 | 西京学院 | A kind of double elements liquid propellant liquid level measure and control device |
| CN108362355B (en) * | 2017-12-18 | 2019-12-20 | 北京遥测技术研究所 | Liquid level measurement method and device based on segmented capacitor and electronic equipment |
| CN111632227B (en) * | 2020-04-23 | 2022-12-06 | 罗云汉 | Infusion monitoring control system and device |
| CN112798077B (en) * | 2020-12-29 | 2023-04-07 | 北京金迈捷科技股份有限公司 | Liquid level height analysis method, device, equipment, storage medium and system |
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| SU632909A2 (en) * | 1977-03-09 | 1978-11-15 | Уфимский моторостроительный завод | Capacitance-type level sensor |
| CN2250517Y (en) * | 1995-08-28 | 1997-03-26 | 李春和 | Level tube detector |
| JP2004205445A (en) * | 2002-12-26 | 2004-07-22 | Matsushita Electric Works Ltd | Electrostatic capacity type liquid level sensor |
| US7802471B2 (en) * | 2007-12-28 | 2010-09-28 | Sieh Philip J | Liquid level sensing device and method |
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