CN2572359Y - Optical fibre liquid level meter - Google Patents
Optical fibre liquid level meter Download PDFInfo
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- CN2572359Y CN2572359Y CN 02269935 CN02269935U CN2572359Y CN 2572359 Y CN2572359 Y CN 2572359Y CN 02269935 CN02269935 CN 02269935 CN 02269935 U CN02269935 U CN 02269935U CN 2572359 Y CN2572359 Y CN 2572359Y
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- fiber
- liquid level
- optical fiber
- encoding disk
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Abstract
The utility model relates to an optical fiber liquid level meter, which is composed of a liquid level detector and an optical fiber sensor, wherein, the optical fiber sensor comprises an optical wave chopping modulation type optical encoding disc, an optical fiber detecting head, an emitting optical fiber, a receiving optical fiber and an optical-electrical converter; the liquid level detector comprises a closed loop mechanical equilibrium system which is composed of an upper fixed pulley, a lower movable pulley, a pulling cable, a floating mark and a weight dropper; the upper fixed pulley and the optical encoding disc are driven for coupling by a multipolar constant magnet magnetic disc. The utility model also has the functions that the utility model can judge the rotating direction of the optical encoding disc and can control the optical encoding disc to swing. The utility model has the characteristics of simple structure, good measuring accuracy, intrinsic safety, stable performance, convenient installation and maintenance, good quality, low price and low failure rate.
Description
One, technical field
The utility model relates to a kind of liquid level self-operated measuring unit, especially for the device of the liquid level of measuring flammable and combustible liquids.
Two, background technology
At present, be used to measure the device of flammable and combustible liquids liquid level both at home and abroad, the representative product of realizing industrialization has two kinds:
1, photoconduction electronic level instrument: see " the great technical renovation of UBG series photoconduction electronic level instrument " (" oil-refining chemical robotization ", publish at station, Petro-Chemical Corporation of the Ministry of Chemical Industry automatic control design centre, the patent No. is 88200398), its structure and principle of work are as shown in Figure 1, liquid level detects with liquid level sensor, detection head is made up of buoy 2a, connection steel band 3a, angle sheave 4a, information code band 5a etc., and light signal is converted to electric signal, is sent to secondary instrument 7a, computing machine 8a with cable through photoelectricity transmitter 6a; Adopt absolute type gray encoding and direct-injection type (without optical fiber) input, make the direct correlation of infrared emission and receiving tube, improved the infrared light transfer efficiency, belong to the instrument of explosion-proof type.
2, fiber optic liquid height meter: see " principle of fiber optic liquid height meter and characteristics " (" China's metering " magazine 62 phase of January calendar year 2001 P48-49, the patent No. 93216664), system is made up of detecting unit (comprising mechanical parts such as ball float 8b, wire rope 9b, weight 10b, angle sheave, rope sheave, magnetic coupling), Fibre Optical Sensor 11b, Transmission Fibers, photoelectric commutator, secondary instrument and computing machine as shown in Figure 2.Magnetic coupling is magnetic ball float 8b and the magnetic force ball float system that isolates the magnetic weight 12b composition in the conduit, weight 10b connects the pulley transmission by wire rope 9b traction, liquid level is changed the rotation that is converted to optical encoding disk, thereby determine the height of ball float in oil tank.
The said goods is complex structure not only, needs the professional to be responsible for installation, maintenance, and on the high side, the user is difficult to bear, but also has the deficiency of following several respects:
1) buoy of the said goods (ball float) traction is open loop mechanical balance system: buoy (ball float) pull-cord is open cycle system through the mechanical balance system that angle sheave and weight connect to form.Mostly be to allow the weight end of pull-cord be installed in outside the oil tank; buoy causes guiding to take turns to the length variations of cable segment between the buoy at differing heights; this section hawser deadweight or be immersed in the buoyancy that the cable segment in the oil produces and change; influence the mechanics balanced system immediately; form new equilibrium state, thereby cause measuring error with level height.Though photoconduction liquid level instrument considers that this is inconsiderate, adopt the hawser of two kinds of different materials, different specific weight, different length to be connected in series the measure of compensating error, it is complicated that physical construction just becomes.Such structure makes its suitable jar of type also be restricted, and particularly the oil tank in pressure oil tank, the cavern, underground petrol tank just can't use at all.
2) in order to guarantee that buoy (ball float) lifts into vertical state at pull-cord, this series products all adopts buoy guide piece 1a, 1b in oil tank, both caused complex structure, made and installation and maintenance trivial operations or be difficult to on-line operation increased machining cost again.
3) photoconduction liquid level instrument directly is converted to electric signal in the tank field with signal, immediately with the long pass of anti-explosion cable rope, belongs to the explosion-proof liquid level instrument of non-intrinsically safe safety.
4) optical encoding disk of fiber optic liquid height meter is by connecting weight through the hawser of angle sheave, magnet-wheel, and the friction force between roller and the rope drags, and hawser and wheel tread have only 1/4 of wheel girth, easily take place to slide to misplace, thus the measuring error of causing.
Three, summary of the invention
The purpose of this utility model is to overcome the deficiency that existing product exists, and design a kind of explosive liquid level that is used to measure, and essential safety, measurement are accurate, simple in structure, dependable performance, easy to maintenance, low price, the optical-fiber liquid level gauge that is easy to promote.
For realizing this purpose, the utility model adopts following structure: be made up of level sensor and Fibre Optical Sensor, Fibre Optical Sensor comprises optical encoding disk, fiber detector, launching fiber, reception optical fiber and photoelectric commutator; Level sensor comprise by last fixed pulley, down travelling block, be connected in pull-cord between two pulleys, be arranged at the buoy on the pull-cord and be connected in down the closed circuit mechanical balance system that the weight on the travelling block is formed; Above-mentioned last fixed pulley and optical encoding disk are by the magnet driving that intercouples.
Above-mentioned magnet adopts the disk of being made up of multipole permanent magnet, and this disk is symmetrically distributed to hold in the mouth by the neodymium iron boron unipolar magnets and is pressed into dish.
Above-mentioned optical encoding disk is the optical encoding disk of light chopping modulation type, and the circumference of optical encoding disk mills into periodic calibration tooth, launching fiber with receive the optical fiber optical encoding disk both sides that are placed in.
Its principle of work is: when liquid level change, buoyancy changes and causes that buoy floats, the fixed pulley rotation is gone up in the pull-cord pulling that connects buoy, by strong magnetic coupling disk, optical encoding disk and last fixed pulley are rotated synchronously, the straight-line displacement of liquid level is changed, and the linear angle of circumference that is converted to optical encoding disk changes.Fibre Optical Sensor detects the light pulse change information, through opto-electronic conversion, signal Processing, demonstration liquid level value
The utility model is compared with existing product and design, have following characteristics: 1) buoy, pull-cord, upper and lower pulley and weight are formed closed circuit mechanical balance system, two pulleys all have 1/2 girth closely to contact with hawser, increased friction force, stopped the dislocation of sliding.Physical construction is simple, and total system all places in the oil tank, and pull-cord is under the effect of the heavy power of hammer, and is vertical automatically, need not track-type facilities, be easy to install, seal isolation is convenient, mechanical system is definitely separated with optical system, has both guaranteed the oil tank strict seal, makes optical system avoid oil vapour pollution again.Instrument is applicable to various jars of types of normal pressure, pressurization, and the oil tank, the ground tank that are particularly suitable in the cavern are installed and used.2) adopt the strong magnetic coupling of multipole permanent magnet to drive chopping modulation formula coding CD and rotate, have characteristics simple in structure, that manufacturing is easy and precision is high.3) use Fibre Optical Sensor, flash ranging light passes, and the tank field does not have electric operation, is the checkout equipment of essential safe type.
Compact conformation, machining, the circuit design of a whole set of instrument are simple.Show that through on probation Instrument measuring precision is good, essential safety, stable performance are installed simply, and easy to maintenance, the property favorable rates is honest and clean, and failure rate is low, help producing in batches and applying.
Four, description of drawings
Below in conjunction with drawings and Examples the utility model is described in further detail.
Fig. 1 is the structural representation of existing photoconduction electronic level instrument.
Fig. 2 is the structural representation of existing fiber optic liquid height meter.
Fig. 3 is the structural representation of the optical-fiber liquid level gauge of the utility model design.
Fig. 4 is the cut-open view along A-A direction among Fig. 3.
Fig. 5 is the structural drawing that optical encoding disk turns to differentiation and speed measuring system in this optical-fiber liquid level gauge.
Fig. 6 is the circuit theory diagrams of system shown in Figure 5.
Five, embodiment
As shown in Figure 3, be the optical-fiber liquid level gauge that is applied in the oil tank, form by level sensor and Fibre Optical Sensor.
Fibre Optical Sensor comprises optical encoding disk 1, fiber detector 2, launching fiber 3, receives optical fiber 4 and photoelectric commutator 5.Above-mentioned optical encoding disk 1 adopts light chopping modulation type, and promptly the circumference of optical encoding disk 1 mills into periodic calibration tooth, launching fiber 3 with receive optical fiber 4 optical encoding disk 1 both sides that are placed in.Launching fiber 3 emission continuous lights, when optical encoding disk 1 rotates copped wave, receive light pulse by receiving optical fiber 4, the information of carrying out detects, and, become electric pulse through photoelectric commutator 5, shaping circuit by Optical Fiber Transmission information, finish setting, counting and line output by 8951 Single Chip Microcomputer (SCM) system and show, serial output interface circuit and host computer on-line communication simultaneously realizes that flash ranging light passes, the scene does not have electricity, the sensing of essential safe type, detection.
Level sensor comprises fixed pulley 6, following travelling block 7, is connected in the pull-cord 8 between two pulleys, the weight 11 that is arranged at the buoy 9 on the pull-cord and hangs on down travelling block 7 by universal bar 10.Buoy 9, following travelling block 7, weight 11 place in the oil tank 12.Last fixed pulley 6, optical encoding disk 1 and fiber detector 2 are provided with the tank body top, also seal with outer cover 13.Last fixed pulley 6 is located on the bracing frame 16a rotationally by bearing 14a, rotating shaft 15a, and the end of rotating shaft 15a is provided with disk 17a.Optical encoding disk 1 is located on the bracing frame 16b rotationally by bearing 14b, rotating shaft 15b, and the end of rotating shaft 15b is provided with disk 17b.Disk 17a, 17b are symmetrically distributed to hold in the mouth by the neodymium iron boron unipolar magnets and are pressed into dish.Barrier box 18 sealings of being made by permeability magnetic material definitely separate optical systems such as mechanical system such as fixed pulley 6 and optical encoding disk 1, have so both guaranteed the oil tank strict seal, make optical system avoid oil vapour pollution again.
The principle of work of this instrument is: form closed circuit mechanical balance system by last fixed pulley 6, following travelling block 7, pull-cord 8, buoy 9, weight 11.When oil level changed, buoy 9 load lines moved, and buoyancy changes and causes that buoy 9 floats, and pull-cord 8 pullings of connection buoy are gone up fixed pulley 6 and rotated.Last fixed pulley 6 drives coaxial with it continuous disk 17a, thereby drives coupling disk 17b, and optical encoding disk 1 and last fixed pulley 6 are rotated synchronously, and with the straight-line displacement variation of oil level, the linear angle of circumference that is converted to optical encoding disk 1 changes.Fibre Optical Sensor detects the light pulse change information, through opto-electronic conversion, signal Processing, demonstration level height value.Optical-fiber liquid level gauge also has the spacing warning function that presets of oil level.
The outstanding innovative point of another of this instrument is: have optical encoding disk and turn to differentiation and slewing rate measurement function.
As everyone knows, oil level rises, the buoy come-up; Oil level descends, and buoy sinks.Whenever the oil tank oil-feed or when draining the oil, pasta evokes fluctuation, causes buoy to rock, cause that CD rocks.Still does not have at present solution in the document delivered of magazine and the sci-tech book and rock the technical scheme that optical encoding disk under the situation turns to correct decision.The utility model utilizes hardware--digital circuit and software--, and single-chip microcomputer is handled two kinds of technical methods, has solved optical encoding disk effectively and has rocked under the situation, and the problem that turns to correct decision and slewing rate to measure has guaranteed the accuracy of measuring.
The following describes the principle that turns to correct decision and slewing rate to measure: the circumference of chopping modulation type optical encoding disk 1 is to mill into periodic calibration tooth, the position that is D at the facewidth and space width is provided with two pairs of emissions, receive optical fiber detects, two launching fibers or two spacings that receive optical fiber are d, d＜D.CD just transfers to clockwise to be changeed, and counterclockwise rotation is counter-rotating.As shown in Figure 5.Optical fiber receives optical information, is converted to electric pulse.The corresponding calibration tooth of high level of setting electric pulse leads to the light part, is designated as " 1 ", and zero level is for being in the light partly, being designated as " 0 ", and the electric pulse forward position is designated as " ", and the back is along being designated as " ".With calibration tooth two edges serves as to differentiate point, when optical encoding disk rotates, rotation direction is differentiated and the umber of pulse measurement.Can list logical equation:
Just change: A () B (1)+A () B (0)=1
Counter-rotating: A (1) B ()+A (0) B ()=1
Hardware circuit according to the logical equation design--optical encoding disk rotates direction judgment circuit, is formed by connecting by shaping circuit 19, differentiating circuit 20, phase inverter 21, AND circuit 22 and OR circuit 23, as shown in Figure 6.Wherein, I end, II end are respectively input end, and the III end is positive rotaring signal output terminal, and the IV end is the reverse signal output terminal, and the V end is the counting pulse signal output terminal.
The design of software aspect mainly is that the timer of design 8951 Single Chip Microcomputer (SCM) system interrupts, and differentiates calibration tooth optical encoding disk rotation direction and photo-impulses counting and measures.
The design also adopts to rock and declares to declaring to signal and count pulse that software extracts, and the measuring error that the load line displacement caused when the direction of floating was suddenlyd change is revised.Because oil level changes; buoy fluctuates; when the resistance that produces when friction force changes; the buoy waterline variable quantity surpasses the measuring accuracy range of control of design; may make the load line changing value surpass the measuring error that allows, so the design also adopts to rock to declare to declaring to signal and count pulse of extracting of software and revises.Fluctuate when sudden change load line of buoy is moved the measuring error that causes and revises, to guarantee the accuracy of measured value.
Claims (5)
1, optical-fiber liquid level gauge, form by level sensor and Fibre Optical Sensor, Fibre Optical Sensor comprises optical encoding disk, fiber detector, launching fiber, reception optical fiber and photoelectric commutator, it is characterized in that: level sensor comprise by last fixed pulley, down travelling block, be connected in pull-cord between two pulleys, be arranged at the buoy on the pull-cord and be connected in down the closed circuit mechanical balance system that the weight on the travelling block is formed; Above-mentioned last fixed pulley and optical encoding disk are by the magnet driving that intercouples.
2, optical-fiber liquid level gauge according to claim 1 is characterized in that: above-mentioned magnet adopts the disk of being made up of multipole permanent magnet, and this disk is symmetrically distributed to hold in the mouth by the neodymium iron boron unipolar magnets and is pressed into dish.
3, optical-fiber liquid level gauge according to claim 1, it is characterized in that: above-mentioned optical encoding disk is the optical encoding disk of light chopping modulation type, the circumference of optical encoding disk mills into periodic calibration tooth, launching fiber with receive the optical fiber optical encoding disk both sides that are placed in.
4, optical-fiber liquid level gauge according to claim 3, it is characterized in that: two pairs of emissions are set on the equidistant position of the facewidth and space width, receive optical fiber, between two launching fibers or two receive spacing between the optical fiber less than the facewidth or the space width of optical encoding disk on this position.
5, optical-fiber liquid level gauge according to claim 4 is characterized in that: comprise that also the optical encoding disk that is formed by connecting by shaping circuit, differentiating circuit, phase inverter, AND circuit and OR circuit rotates direction judgment circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02269935 CN2572359Y (en) | 2002-09-29 | 2002-09-29 | Optical fibre liquid level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02269935 CN2572359Y (en) | 2002-09-29 | 2002-09-29 | Optical fibre liquid level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2572359Y true CN2572359Y (en) | 2003-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02269935 Expired - Fee Related CN2572359Y (en) | 2002-09-29 | 2002-09-29 | Optical fibre liquid level meter |
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| Country | Link |
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| CN (1) | CN2572359Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975604A (en) * | 2010-10-13 | 2011-02-16 | 北京交通大学 | Liquid level height measuring device based on Rayleigh scattering |
| WO2015043506A1 (en) * | 2013-09-26 | 2015-04-02 | 江苏多维科技有限公司 | Multiturn pulley liquid level sensor device |
| CN105783866A (en) * | 2016-04-28 | 2016-07-20 | 东华大学 | Liquid level meter and settlement monitoring system based on low-coherence interference technology |
| CN105974080A (en) * | 2016-06-20 | 2016-09-28 | 无锡虹业自动化工程有限公司 | Spherical sewage detection equipment |
| CN107345806A (en) * | 2016-05-06 | 2017-11-14 | 财团法人国家实验研究院 | Detection system and detection method using same |
| CN109990724A (en) * | 2019-02-27 | 2019-07-09 | 西安科技大学 | Prestressing force loading experimental apparatus, system and method based on distributed fiberoptic sensor |
-
2002
- 2002-09-29 CN CN 02269935 patent/CN2572359Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975604A (en) * | 2010-10-13 | 2011-02-16 | 北京交通大学 | Liquid level height measuring device based on Rayleigh scattering |
| WO2015043506A1 (en) * | 2013-09-26 | 2015-04-02 | 江苏多维科技有限公司 | Multiturn pulley liquid level sensor device |
| US9952085B2 (en) | 2013-09-26 | 2018-04-24 | MultiDimension Technology Co., Ltd. | Multiturn pulley liquid level sensor device |
| CN105783866A (en) * | 2016-04-28 | 2016-07-20 | 东华大学 | Liquid level meter and settlement monitoring system based on low-coherence interference technology |
| CN105783866B (en) * | 2016-04-28 | 2018-04-06 | 东华大学 | A kind of tank gage and sedimentation monitoring system based on low coherence interference technology |
| CN107345806A (en) * | 2016-05-06 | 2017-11-14 | 财团法人国家实验研究院 | Detection system and detection method using same |
| CN105974080A (en) * | 2016-06-20 | 2016-09-28 | 无锡虹业自动化工程有限公司 | Spherical sewage detection equipment |
| CN109990724A (en) * | 2019-02-27 | 2019-07-09 | 西安科技大学 | Prestressing force loading experimental apparatus, system and method based on distributed fiberoptic sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030910 Termination date: 20100929 |