CN2288425Y - Ultrasonic liquid level measurer for oil tank - Google Patents
Ultrasonic liquid level measurer for oil tank Download PDFInfo
- Publication number
- CN2288425Y CN2288425Y CN 96233124 CN96233124U CN2288425Y CN 2288425 Y CN2288425 Y CN 2288425Y CN 96233124 CN96233124 CN 96233124 CN 96233124 U CN96233124 U CN 96233124U CN 2288425 Y CN2288425 Y CN 2288425Y
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- transducer
- signal generator
- chip microcomputer
- circuit
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model relates to an ultrasonic liquid level measurer for oil tanks, which solves the problems of low measuring accuracy and inconvenient testing of traditional ultrasonic liquid level measurers. The bottom of an oil tank is provided with a low frequency transducer and a high frequency transducer, and the utility model can measure the liquid level height with making use of the transmission time difference of the two ultrasonic waves. So the measurement can not be affected by the thickness of the tank bottom and the sediment such as water, etc., and the measuring precision is high. The utility model can be used for measuring the level height of inflammable, explosive, noxious and corrosive liquid in the departments of petroleum and chemical industry.
Description
The utility model relates to oil tank level to be measured, and belongs to the Measuring and testing series products.In units such as refinery, oil depot, chemical plant, oil companies, usually need the liquid level of oil tank is measured.Storage tank ultrasonic liquid-level measurement device mainly is made up of transducer and secondary instrument.
Shanghai Automatic Instrument and Meter Factory No.5 has produced a kind of YCS type digital type ultrasound wave liquid level gauge, its purpose is to utilize the excellent specific property of the handy and safe that the ultrasound wave non-cpntact measurement had, go to measure inflammable, explosive, poisonous, the liquid level of mordant liquid, formation is that a transducer is contained in container bottom, when instrument produces the signal excitation transducers transmit ultrasonic waves, make the counter in the instrument begin counting, when ultrasound wave when liquid level reflects back into transducer, transducer converts echoed signal to electric signal, this signal is closed counter after treatment, so just measure sound pulse from being transmitted into the required time that receives, speed according to sonic propagation in the liquid, just can determine liquid level, its weak point be not the energy measurement ultrasound wave at the round trip propagation time of vessel bottom wall, when tank bottom had deposit dirt, measuring accuracy further reduced.
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of measuring accuracy height, storage tank ultrasonic liquid-level measurement device easy to install are provided.
This practical purpose can reach by the following technical programs: the utility model comprises transducer [1], [2] and secondary instrument [3], connect with high frequency cable between transducer and the secondary instrument, secondary instrument [3] comprises signal generator [5], the amplifying circuit [6] that connects signal generator, the shaping circuit [7] that connects amplifying circuit, the counter [8] that connects single-chip microcomputer, connect shaping circuit, the Single Chip Microcomputer (SCM) system of signal generator and counter [9], the electronic gate [12] that connects amp.in, one end connects transducer, the other end connects the relay [10] of signal generator and amplifying circuit, [11], it is characterized in that one low-frequency transducer [1] and a high-frequency transducer [2] being installed abreast in the storage tank bottom; Signal generator [5] is made up of two monostalbe triggers and power amplification circuit, two monostalbe trigger branches are controlled triggering by the P1.0 position and the P1.1 position of the P1 mouth of single-chip microcomputer, the pulse width of monostalbe trigger output is by external resistance, electric capacity decision, the pulse of its output arrives power amplification circuit through diode, and the pulse signal of this circuit output excites transducer [2] or [1] through relay [10] or [11].
The utility model utilizes the basis of ultrasonic measurement oil tank level to be: because of hyperacoustic propagation distance H is determined by its travel-time T and velocity of propagation C, that is:
H＝CT (1)
As seen, for the oil tank of Any shape,, just can determine the height H of jar interior oil storage as long as accurately measure the travel-time and the velocity of propagation of ultrasound wave in liquid.When ultrasound wave was propagated in medium, its signal attenuation was directly proportional with frequency, and promptly frequency is low more, and signal attenuation is more little; Frequency is high more, and signal attenuation is fast more.So low-frequency transducer 1 is used for measuring the big distance H from transducer mounting points (datum mark) to an oily aerosphere face
1:
H1＝(C
st
s+C
wt
w+C
ot
o)/2 (2)
(2) in the formula: C
sThe velocity of propagation of ultrasound wave in the jar diapire
t
sThe round trip propagation time of ultrasound wave in the jar diapire
c
wUltrasound wave is in water transmission speed
t
wThe round trip propagation time of ultrasound wave in water
c
oThe velocity of propagation of ultrasound wave in oil
t
oThe round trip propagation time of ultrasound wave in oil
The measurement blind area of general high-frequency transducer is smaller, thus high-frequency transducer 2 be used for measurement from the datum mark to oil-the small distance H of water termination
2:
H
2＝(C
st
s+C
wt
w)/2 (3)
(3) C in the formula
s, t
s, C
w, t
wThe meaning of representative is identical with (2) formula, and the high H of liquid level of jar interior petroleum products of adorning is like this:
H＝H
1-H
2＝(C
ot
o)/2 (4)
Because the time t that low-frequency transducer 1 records
1Determine by following formula:
t
1＝t
s+t
w+t
o (5)
The time t that high-frequency transducer 2 records
2Determine by following formula:
t
2＝t
s+t
w (6)
Be changed to so (4) formula is variable:
H＝c
ot
o/2＝c
o(t
1-t
2)/2 (7)
By (7) formula as can be seen, as long as accurately measure two hyperacoustic round trip propagation times of transducer, according to ultrasonic propagation velocity in the petroleum products, just can calculate the liquid level in the oil tank, that is measure the influence that oil tank level is not subjected to base plate thickness, water surface elevation and the deposit dirt etc. of concrete oil tank.
Being described as follows of the drawing of accompanying drawing;
Fig. 1 is a storage tank ultrasonic liquid-level measurement device synoptic diagram
Fig. 2 is the block diagram of system of device
Fig. 3 is that the signal of device takes place and amplification circuit diagram
Fig. 4 is the signal transformation circuit figure of device
Fig. 5 is single-chip computer control system figure
Fig. 6 is the Control Software process flow diagram of device
Among the figure: 1. low-frequency transducer 2. high-frequency transducers 3. secondary instruments 4. oil tank diapires 5. signal generators 6. amplifying circuits 7. shaping circuits 8. counters 9. 8031 Single Chip Microcomputer (SCM) system 10. relays 11. relays 12. electronic gates 13. crystal oscillators
Describe the details and the working condition of the utility model device in detail below in conjunction with accompanying drawing.
Two ultrasonic transducers adopt piezoelectricity pottery magnetic transducer cheap, stable performance, transducer is installed in the bottom outer wall of tested oil tank, make couplant with grease, can get rid of the air between tank skin and the transducer like this, transducer and oil tank diapire well are coupled, connect with high frequency cable between transducer and the secondary instrument.Secondary instrument is made up of signal generator 5, amplifying circuit 6, shaping circuit 7 and single-chip microcomputer 9 etc.In order to improve count frequency, reduce timing error, do not adopt the counter of single-chip microcomputer inside, and at the external counter 8 of single-chip microcomputer.Single-chip microcomputer adopts 8031 single-chip microcomputers, forms minimal application system by 74LS373, EPROM2732 etc., external a slice 8155 programmable Is/O mouth.It is 8254 of 10MHZ that counter 8 adopts count frequency.Electronic gate adopts 4066 two-way switchs, the GJ solid-state relay that relay 10.11 adopts Beijing photoelectric device factory to produce.
The resonance ratio of low-frequency transducer 1 is 100KHZ, and its maximum measurement range is 15m, measures blind area≤35cm, and the resonance frequency of high-frequency transducer 2 is 2MHZ, and it measures blind area≤5mm.The trigger pulse of transducer is provided by signal generator, and signal generator is made up of two 74LS122 monostalbe triggers and power amplification circuit, and its working condition is by the p1.0 and the control of p1.1 position of single-chip microcomputer p1 mouth.When wherein one when sending direct impulse (from low to high), the pulse that corresponding trigger sends certain width, its pulsewidth is by trigger outer meeting resistance and electric capacity decision.After power amplification, the output pulse signal voltage magnitude is 25V.
High-frequency transducer ultrasound wave t two-way time
2Be to measure like this: the closed relay 10 (control of p1.2 position) that leads to high-frequency transducer of single-chip microcomputer control earlier, disconnect the relay 11 (control of p1.3 position) that leads to low-frequency transducer, disconnect the electronic gate 12 (control of p1.4 position) that leads to amplifying circuit simultaneously.Send a pulse control signal by single-chip microcomputer (p1.0 position) then, trigger signal generator makes it to send the rect.p. that pulsewidth is 0.25us, single-chip microcomputer when sending pulse control signal, enabling counting device 8.Through after the time-delay of 2us, Single-chip Controlling unlocking electronic door 12.High-frequency transducer sends the ultrasound wave that frequency is 2MHZ under pulse excitation, when ultrasound wave arrived jar end inside surface and liquid interface, a part was returned transducer with the form of echo, and another part then sees through the interface to be continued to propagate forward.High-frequency transducer is after receiving the echoed signal that oil tank diapire and liquid interface are returned, be converted into electric signal, signal is by electronic gate 12 arriving signal amplifying circuits 6, amplifying circuit adopts ultralow drift operational amplifier F7650, after two-stage is amplified, its enlargement factor can reach 80-120db, signal after the amplification enters shaping circuit 7, shaping circuit is formed partial pressure type double limiting circuit with two stage amplifer, its objective is that with amplifying the different signal shaping of back amplitude be that positive and negative pulsewidth is equal substantially, the rect.p. that amplitude is identical, to be fit to the Single-chip Controlling needs, for improving shaping effect, the utility model has been selected the double operational LF353 of switching rate height (13v/us) for use, signal after the shaping arrives single-chip microcomputer INTO position, causes singlechip interruption, after the singlechip interruption, read the data in the counter 8, the time that at this moment records is the round trip propagation time t of ultrasound wave at the bottom of the jar
sSeeing through jar diapire and liquid interface at a part of ultrasonic signal enters when propagating in the liquid, if bottom settlings has water, signal is when arriving water one oil content interface, have echoed signal equally and return transducer, this signal is after amplifying shaping, read data in the counter by singlechip interruption, the time that at this moment records promptly is by t
sWith ultrasound wave round trip propagation time t in the water
wThe t that forms
2If a jar end, do not have water, when promptly high-frequency transducer can not receive water-oily echoed signal within a certain period of time, single-chip microcomputer with the numerical value that reads for the first time as t
2, at this moment t is promptly arranged
s=t
2
At t
2After measurement was finished, system began to measure from transducer mounting points (witness mark) to oil-the ultrasound wave round trip propagation time t of aerosphere face
1Single-chip microcomputer elder generation count initialized device 8, and control closing relay 11 disconnect relay 10 (control of p1.2 position) and electronic gate 12, and then trigger signal generator 5 (control of p1.1 position) makes it to send the rect.p. that pulsewidth is 5us.Simultaneously, the enabling counting device begins counting.Since the measurement blind area of low-frequency transducer bigger (＜＜35cm), therefore jar diapire and water surface echo and water-oily interface echo are general all in the measurement blind area, in order not influence measurement, single-chip microcomputer does not receive any echoed signal in the measurement blind area.So single-chip microcomputer is behind time-delay 35us, just electronic gate 12 is opened in control, allows echoed signal to arrive amplifying circuit, and signal causes singlechip interruption after amplifying shaping.Single-chip microcomputer reads the data in this hour counter, and the time that at this moment records is t
1At t
1After measurement was finished, single-chip microcomputer was according to H=c
o(t
1-t
2Data processing is carried out in)/2, can try to achieve the oil tank level height, the stochastic error in order to reduce to measure, and device once carries out the measurement in five cycles, with the mean value measured for the five times actual measured value as liquid level H.
The utility model has following advantage compared to existing technology:
1. certainty of measurement height. Device adopts two ultrasonic transducers to measure, with two The time difference that individual transducer records is as the propagation time of ultrasonic wave in testing liquid, Survey time t1And t2The time, the error that secondary meter brings is identical, therefore disappears preferably Except the error of measuring instrument system with owing to temperature, humidity variation and component ageing are drawn The error that rises, for the situation that water and deposit dirt are arranged at the bottom of the tank since during the seeking time difference With its impact payment, so do not affect liquid level measurement precision.
Mounting means simple, be easy to safeguard. Because transducer is installed in outside the pot bottom Wall does not need other attachment device and equipment, does not affect operation and the operation of tank during installation. Because transducer adopts grease to be fixed installation, care and maintenance is all very convenient simultaneously.
3. simple to operation. The utility model operation does not need to know the thick of tank diapire Degree, material and other parameter, the ultrasonic propagation velocity of liquid medium be in advance storage also In single-chip microcomputer inside, and can pass through the additional temp interface, realization is automatic to velocity of sound temperature Proofread and correct. When the user operates, only need press gauge tap, single-chip microcomputer is just measured automatically Control, data are processed and the result shows, operate very easy.
Claims (1)
1. storage tank ultrasonic liquid-level measurement device, it comprises transducer [1], [2] and secondary instrument [3], connect with high frequency cable between transducer and the secondary instrument, secondary instrument [3] comprises signal generator [5], the amplifying circuit [6] that connects signal generator, the shaping circuit [7] that connects amplifying circuit, the counter [8] that connects single-chip microcomputer, connect shaping circuit, the Single Chip Microcomputer (SCM) system of signal generator and counter [9], the electronic gate [12] that connects amp.in, one end connects transducer, and the other end connects the relay [10] of signal generator and amplifying circuit, [11] it is characterized in that one low-frequency transducer [1] and a high-frequency transducer [2] being installed abreast in the storage tank bottom; Signal generator [5] is made up of two monostalbe triggers and power amplification circuit, two monostalbe triggers are triggered by the P1.0 position and the control of P1.1 position of the P1 mouth of single-chip microcomputer respectively, the pulse width of monostalbe trigger output is by external resistance, electric capacity decision, the pulse of its output arrives power amplification circuit through diode, and the pulse signal of this circuit output excites transducer [2] or [1] through relay [10] or [11].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96233124 CN2288425Y (en) | 1996-05-18 | 1996-05-18 | Ultrasonic liquid level measurer for oil tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96233124 CN2288425Y (en) | 1996-05-18 | 1996-05-18 | Ultrasonic liquid level measurer for oil tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2288425Y true CN2288425Y (en) | 1998-08-19 |
Family
ID=33909887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96233124 Expired - Fee Related CN2288425Y (en) | 1996-05-18 | 1996-05-18 | Ultrasonic liquid level measurer for oil tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2288425Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674181A (en) * | 2013-12-04 | 2014-03-26 | 江苏大学 | Dynamic liquid level ultrasonic detection device and method |
| CN101896797B (en) * | 2007-12-18 | 2015-12-09 | 恩德莱斯和豪瑟尔两合公司 | For the method for level gauging |
| CN105758499A (en) * | 2016-04-18 | 2016-07-13 | 南京理工大学 | Non-contact type liquid level detection system and method based on ultrasonic pulse echo method |
| CN113566929A (en) * | 2021-09-27 | 2021-10-29 | 山东西王食品有限公司 | Oil tank liquid level ultrasonic measurement method, system, terminal and storage medium based on LSTM |
-
1996
- 1996-05-18 CN CN 96233124 patent/CN2288425Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101896797B (en) * | 2007-12-18 | 2015-12-09 | 恩德莱斯和豪瑟尔两合公司 | For the method for level gauging |
| CN103674181A (en) * | 2013-12-04 | 2014-03-26 | 江苏大学 | Dynamic liquid level ultrasonic detection device and method |
| CN105758499A (en) * | 2016-04-18 | 2016-07-13 | 南京理工大学 | Non-contact type liquid level detection system and method based on ultrasonic pulse echo method |
| CN113566929A (en) * | 2021-09-27 | 2021-10-29 | 山东西王食品有限公司 | Oil tank liquid level ultrasonic measurement method, system, terminal and storage medium based on LSTM |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |