CN1233992C - Liquid level measurer based on eddy effect - Google Patents
Liquid level measurer based on eddy effect Download PDFInfo
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- CN1233992C CN1233992C CN 02159486 CN02159486A CN1233992C CN 1233992 C CN1233992 C CN 1233992C CN 02159486 CN02159486 CN 02159486 CN 02159486 A CN02159486 A CN 02159486A CN 1233992 C CN1233992 C CN 1233992C
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- liquid level
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- sounding rod
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- eddy effect
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Abstract
The present invention relates to a liquid level measuring device based on the vortex effect, which comprises a signal processing display, a floatable vortex tube and a measuring rod, wherein an induction coil is arranged in the measuring rod; the vortex tube is sheathed on the external side of the measuring rod in a sliding mode; when the interface height of the liquid to be measured is varied, the vortex tube moves up and down along the measuring rod along with the liquid interface height, so that the induction coil generates vortex effect signals; the signal output line of the measuring rod is electrically connected with the signal input end of the signal processing display, and the signal processing display calculates and processes input signals. The measuring device provided by the present invention converts the liquid level or the interface height size of the liquid into inductance variation signals by using the vortex effect principle, and obtains accurate liquid height and liquid interface height values through the measurement and the conversion of the varied inductance signals. The measurement accuracy of the device is not reduced along with the enlargement of the measurement range of the device, and can realize the liquid level high accuracy measurement of superlong measurement range.
Description
Technical field
The invention discloses a kind of liquid level emasuring device based on eddy effect, particularly a kind of liquid level or liquid circle position height change in the storage tank is converted into electric signal by eddy effect with the coil inductance variable quantity, and obtain high-precision liquid level, liquid circle position height number with this, belong to the measurement technology application.
Background technology
At present, industrial when liquid stored in the storage tank is carried out Measuring and testing, adopt level gauging instrument and static pressure measurement instrument two big classes usually.
The level gauging instrument mainly contains: the BM60 type servo-type measuring system that the 6500 type servo-type level meters that U.S. VAREC company produces, German KROHNE company produce, the 872 serial radar level gauges that Holland produces, the magnetostriction type liquid level gauge released of U.S. K-TEK company and MTS company in recent years.6500 series, BM43 type and BM60 type servo-type level meter that homemade liquid level instrument such as: Beijing Fourth Automation Instrument Factory, Dalian instrument five factories and Ruian instrument and meter for automation factory produce and sell.
The static pressure measurement instrument mainly is the HTG type storage tank measuring system that U.S. ROSEMOUNT company produces.
In above two types storage tank measuring instrument, though the liquid-level type measurement instrument have the measuring accuracy height (error is about ± 1mm) advantage, general energy measurement temperature not promptly enables the magnetostriction type liquid level gauge of thermometric degree, can not accurately calculate liquid quality, carry out the requirement of liquid in storage tank mass metrology so be not suitable for China, and cost an arm and a leg, when this class instrument was installed, each jar needed several ten thousand yuan of costs usually, therefore, has certain difficulty applying of China.Though static pressure type measurement instrument measuring accuracy is higher, it is forbidden the measurement of density, volume, liquid level, can not measure water and oily interface in liquid circle position such as the storage tank, so can't measure the quality that the two-phase wet tank is arranged.In addition, this instrument is because of reasons such as mounting structures, break down easily and serviceable life shorter.
In China, high precision, wide range, cheap and liquid measure instrument that be convenient to the multiparameters such as energy measurement storage tank liquid level, liquid circle position, temperature, pressure, density and liquid quality installing, use, safeguard still belong to blank, and worldwide, do not see relevant report as yet yet.
China is vast in territory, the petroleum resources that are richly stored with, and various types of storage tank are used in a large number.And the reserves of these storage tanks are measured under the less situation of the comprehensive method of investment accurately, especially the ultra-large type storage tank is carried out wide range, high-precision liquid level, liquid circle position and mass measurement, be one of present China metering industry problem anxious to be solved.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of liquid level emasuring device based on eddy effect, this device utilizes principle of eddy-current effect that the height dimension of storage tank liquid level and liquid circle position is converted to the inductance variable signal, and, just can obtain accurate liquid level, liquid circle position height number by mensuration and conversion to the inductance signal that changes.
Another object of the present invention is to provide a kind of liquid level emasuring device based on eddy effect, this device utilizes principle of eddy-current effect, adopt and detect the method that each measuring unit inductance value changes respectively, measuring accuracy is not reduced with the increasing of range, thereby realized the high-acruracy survey of super long range liquid level.
A further object of the present invention is to provide a kind of liquid level emasuring device based on eddy effect, this device utilizes temperature sensor, the pressure transducer in the sounding rod, realization is to the measurement of fluid temperature, density, the final comprehensive physical parameter that realizes accurately measuring fluid to be measured satisfies the related request to the liquid in storage tank mass measurement.
The objective of the invention is to be achieved through the following technical solutions:
A kind of liquid level emasuring device based on eddy effect comprises the signal Processing display, and this device also comprises floatable vortex tube and the inner sounding rod that is provided with inductive coil; The be slidingly located in sounding rod outside of described vortex tube, when the fluid to be measured interfacial level changed, vortex tube moved up and down along sounding rod with the liquid surface height, thereby made inductive coil generation eddy effect signal; The signal input part of the output line of sounding rod and described signal Processing display is electrically connected, and this signal Processing display is to the input signal computing.
The length of described vortex tube is 2～3 times of loop length; Its outside surface is installed with floating body; The quantity of this vortex tube is one or more, can be used for the liquid level of multilayer different medium liquid is measured.
Described sounding rod is the metal body of hollow, and its bottom is a blind end, and inside is provided with by coded sequence and piles up a plurality of inductive coils, temperature sensor and the pressure transducer of putting; Described a plurality of inductive coil has consistent overall dimensions and inductance parameters, for liquid level and the measurement of liquid circle position provide the accurate variation inductance value signal that is produced by eddy effect.
Described temperature sensor quantity is one or more, and this temperature sensor is distributed and is arranged on sounding rod inside, and its output line is connected with signal Processing monitor signal input end, in order to measure the temperature of liquid.
Described pressure transducer is arranged on the bottom and the most significant end of sounding rod, and its output line is connected with signal Processing monitor signal input end; By described pressure transducer can the detected pressures parameter, calculate fluid density and quality.
Described sounding rod is established connection by two joint measuring tubes through the connector string at least, thereby realizes the level gauging of wide range.
Be provided with signal transmission change-over circuit in the described connector, the inductive coil that is provided with in the signal input part of this circuit and the measuring tube is connected, and its output terminal is connected with the output line of sounding rod.
Described measuring tube has the first connection end that is used to set firmly connector, and this connector place, end is provided with and is used to prevent that fluid to be measured from entering the seal element of body; This measuring tube also has second and connects the end, and the connector place of this connection end is provided with and is used to prevent that fluid to be measured from entering the seal element of body.
Pile up by coded sequence in the described measuring tube and be equipped with inductive coil, the signal output part of this inductive coil is connected with the connector signal input end.
Described connector also comprises stiff end, link; The stiff end sealing is installed in first of measuring tube and connects the end; Link is connected the end sealing shroud and connects with second of another measuring tube.
Liquid level emasuring device based on eddy effect provided by the present invention is linked in sequence a plurality of inductive coils with coding and is arranged in the measuring tube, and some measuring tubes that are provided with same inductive coil are linked together by machinery and electric means, thereby form sounding rod; The vortex tube that again one or more is installed with floating body is set in the sounding rod surface and it can be slided on the surface of whole sounding rod.
When carrying out the measurement of liquid level or liquid circle position, floating body floats on the tested liquid level or place, liquid circle position, make vortex tube be stuck in certain position of sounding rod, at this moment, be in the interior coil of vortex tube because of the eddy generation effect, its inductance value is changed, and the inductance value that is not in the coil in the vortex tube does not change.
Because each coil all has preset coding numerical value, and under any circumstance, guaranteeing at least has a coil to be in the vortex tube fully, so, this device only need detect the coil that inductance value changes, by numerical evaluation, and the inductance variable quantity of the unit's of calculating loop length in real time, can calculate the exact position that part is in the coil in the vortex tube in view of the above, according to the coding site of coil, carry out data processing again, can record accurate liquid level, liquid circle position height number.
In addition, measurement mechanism provided by the present invention only need detect the inductance value of single coil respectively, can determine liquid level and liquid circle position height, the range of testing circuit equals the inductance value of single coil, and need just not change and change the size of range with tank level, so this device can connect above-mentioned a plurality of measuring tubes, and keeping carrying out storage tank level gauging in a big way under the constant prerequisite of measuring accuracy.
Also be provided with temperature sensor, pressure transducer in the sounding rod of measurement mechanism provided by the present invention, can detect the temperature and pressure of liquid in storage tank in real time, and calculate fluid density.According to storage tank physical dimension, liquid level, liquid circle position height and fluid density, can calculate the liquid in storage tank quality.The temperature value that detects also can carry out temperature compensation to measurement mechanism, improves measuring accuracy.
The all right merogenesis accumulating of storage tank measurement mechanism based on eddy effect provided by the present invention is convenient to site operation and is installed, and simple to operate, easy to maintenance, cheap, so have great practical value.
Description of drawings
Fig. 1 is the structural representation of first embodiment provided by the present invention;
Fig. 2 is the structural representation of second embodiment provided by the present invention;
Fig. 3 is the structural representation of connector among above-mentioned second embodiment;
Fig. 4 is the circuit theory synoptic diagram of above-mentioned second embodiment;
Fig. 5 is the structural representation of the 3rd embodiment provided by the present invention.
Embodiment
Below, the present invention is described in further detail in conjunction with specific embodiments and with reference to accompanying drawing.
First embodiment
As shown in Figure 1, this embodiment comprises sounding rod 1, vortex tube 2, floating body 3, signal Processing display 4.
The bottom of sounding rod 1 is a blind end, and is provided with closed end 12, enters sounding rod 1 inside in order to prevent fluid to be measured.Also be provided with in the sounding rod 1 by coded sequence and pile up a plurality of inductive coils 11 of putting, the two ends of inductive coil are connected with the signal input part of signal Processing display 4 respectively.
In the present embodiment, floating body 3 is a spherosome, and vortex tube 2 passes the center of this floating body 3, and fixing with these floating body 3 welding.The length of vortex tube 2 is 2.2 times of single inductive coil length.
When liquid level was measured, in the container of fluid to be measured was housed, this moment, floating body 3 was subjected to the effect of liquid buoyancy, swam in the fluid to be measured surface, made vortex tube 2 be stuck in certain position of sounding rod 1 with the present embodiment positioned vertical.Because eddy effect, the inductance value that is included in the inductive coil in the vortex tube 2 changes, and is wherein, maximum with the inductance value variation of all involved inductive coil.The inductance value that changes is sent in the signal Processing display 4, according to the coding of inductive coil, and by computing, just can determine vortex tube 2 residing positions, and then can measure the height number of liquid level accurately.
Second embodiment
Second embodiment is the further improvement of being done on the basis of first embodiment.As shown in Figure 2.It still comprises sounding rod 1, vortex tube 2, floating body 3, signal Processing display 4.Different is: sounding rod 1 is to be established by more piece measuring tube string to be formed by connecting.There is shown the syndeton of sounding rod 1 terminal two joints, promptly measuring tube 11 is established by connector 5 strings with measuring tube 12 and is connected.In measuring tube 11 and measuring tube 12, be respectively arranged with and pile up a plurality of inductive coils 111, the inductive coil of putting 121 by coded sequence.
The inside of connector 5 is provided with signal transmission change-over circuit 51, as shown in Figure 3.Connector 5 comprises stiff end 52, link 53; Stiff end 52 in weld seam 54 place's seal weldings in the connection end of measuring tube 12; Link 53 is provided with O-ring seal 55, and connects with the end sealing shroud that is connected of measuring tube 11 by sealing circle 55.
The inductive coil 111 that is provided with in the measuring tube 11 is connected with the signal input part of signal transmission change-over circuit 51 in the connector 5.The output terminal of signal transmission change-over circuit 51 is connected with the output line of sounding rod.
According to above-mentioned setting be connected, the length of sounding rod 1 can be extended greatly, and then can carry out height to the liquid level in the large-scale storage tank and measure, its measuring method is identical with first embodiment, so do not give unnecessary details.
It should be noted that: owing to all be provided with inductive coil in each measuring tube, its signal transmssion line of drawing is more, so signal must be handled in advance, the line that is connected to signal Processing display 4 input ends is not changed because of the quantity of measuring tube.Solution to this problem is by the transmission of the signal in the connector 5 change-over circuit 51, after this circuit is changed the output signal of inductive coil, be connected to the output line of sounding rod, this output line is connected with the signal input part of signal Processing display 4.As shown in Figure 4, be the circuit theory synoptic diagram.Inductive coil 111, inductive coil 121 are respectively the coil groups that is arranged in measuring tube 11 and the measuring tube 12 among the figure.Induced signal is output through the conversion process of signaling conversion circuit 51 and is connected to sounding rod output line 6, and by this output line 6 inductance is changed numerical value and be sent to signal Processing display 4.
The 3rd embodiment
As shown in Figure 5, present embodiment is the floating body 14 of setting up a vortex tube 13 again and be connected with it on the sounding rod of above-mentioned second embodiment.When fluid to be measured is two kinds of different mediums, adjust floating body 14, make on its interface that can float on fluid to be measured 20 and fluid to be measured 21.According to above-mentioned principle of eddy-current effect, can record the height number of liquid level 20 and liquid level 21.
In addition, also distributing in the sounding rod of present embodiment is provided with temperature sensor 15, and the bottom of sounding rod, most significant end are respectively arranged with pressure transducer 16.The output line of temperature sensor 15, pressure transducer 16 is connected to the signal input part of signal Processing display 4.By the setting of temperature sensor and pressure transducer, can realize the measurement of multiple parameters such as temperature, pressure, liquid circle position and quality to fluid to be measured.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1, a kind of liquid level emasuring device based on eddy effect comprises the signal Processing display, it is characterized in that: this device also comprises floatable vortex tube and the inner sounding rod that is provided with inductive coil; The be slidingly located in sounding rod outside of described vortex tube, when the fluid to be measured interfacial level changed, vortex tube moved up and down along sounding rod with the liquid surface height, thereby made inductive coil generation eddy effect signal; The signal input part of the output line of sounding rod and described signal Processing display is electrically connected, and this signal Processing display is to the input signal computing; The length of described vortex tube is 2～3 times of inductive coil length; Its outside surface is installed with floating body; The quantity of this vortex tube is one or more, can be used for the liquid level of multilayer different medium liquid is measured; Described sounding rod is the metal body of hollow, and its bottom is a blind end, and inside is provided with by coded sequence and piles up a plurality of inductive coils, temperature sensor and the pressure transducer of putting; Described a plurality of inductive coil has consistent overall dimensions and inductance parameters, for liquid level and the measurement of liquid circle position provide the accurate variation inductance value signal that is produced by eddy effect.
2, the liquid level emasuring device based on eddy effect according to claim 1, it is characterized in that: described temperature sensor quantity is one or more, this temperature sensor is distributed and is arranged on sounding rod inside, its output line is connected with signal Processing monitor signal input end, in order to measure the temperature of liquid.
3, the liquid level emasuring device based on eddy effect according to claim 1 is characterized in that: described pressure transducer is arranged on the bottom and the most significant end of sounding rod, and its output line is connected with signal Processing monitor signal input end; By described pressure transducer can the detected pressures parameter, calculate fluid density and quality.
4, the liquid level emasuring device based on eddy effect according to claim 1 is characterized in that: described sounding rod is established connection by two joint measuring tubes through the connector string at least, thereby realizes the level gauging of wide range.
5, the liquid level emasuring device based on eddy effect according to claim 4 is characterized in that: be provided with signal transmission change-over circuit in the described connector, the signal input part of this circuit and measurement
6, the liquid level emasuring device based on eddy effect according to claim 4, it is characterized in that: described measuring tube has the first connection end that is used to set firmly connector, and this connector place, end is provided with and is used to prevent that fluid to be measured from entering the seal element of body; This measuring tube also has second and connects the end, and the connector place of this connection end is provided with and is used to prevent that fluid to be measured from entering the seal element of body.
7, the liquid level emasuring device based on eddy effect according to claim 4 is characterized in that: pile up by coded sequence in the described measuring tube and be equipped with inductive coil, the signal output part of this inductive coil is connected with the connector signal input end.
8, the liquid level emasuring device based on eddy effect according to claim 4, it is characterized in that: described connector also comprises stiff end, link; The stiff end sealing is installed in first of measuring tube and connects the end; Link is connected the end sealing shroud and connects with second of another measuring tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02159486 CN1233992C (en) | 2002-12-31 | 2002-12-31 | Liquid level measurer based on eddy effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02159486 CN1233992C (en) | 2002-12-31 | 2002-12-31 | Liquid level measurer based on eddy effect |
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| Publication Number | Publication Date |
|---|---|
| CN1512148A CN1512148A (en) | 2004-07-14 |
| CN1233992C true CN1233992C (en) | 2005-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02159486 Expired - Fee Related CN1233992C (en) | 2002-12-31 | 2002-12-31 | Liquid level measurer based on eddy effect |
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| CN203106651U (en) * | 2010-06-01 | 2013-08-07 | 齐晓燕 | Straw toy |
| CN106918427B (en) * | 2017-04-28 | 2023-06-13 | 嘉兴南湖学院 | Experimental device for real-time measurement oil blanket leakage rate |
| CN112325976B (en) * | 2020-10-28 | 2024-03-19 | 苏州贝康智能制造有限公司 | Liquid level sensor and liquid level detection system |
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