CN1069131C - Passive liquid-level sensor - Google Patents
Passive liquid-level sensor Download PDFInfo
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- CN1069131C CN1069131C CN 98104977 CN98104977A CN1069131C CN 1069131 C CN1069131 C CN 1069131C CN 98104977 CN98104977 CN 98104977 CN 98104977 A CN98104977 A CN 98104977A CN 1069131 C CN1069131 C CN 1069131C
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Abstract
The present invention relates to a passive liquid level sensor which belongs to the technical field of automation control, particularly to a sensor which is used for liquid level monitoring. The present invention is characterized in that the passive liquid level sensor is passive and is a rod type datum sampling sensor which can be used for magnetic sensing sampling through a magnetosensitive device. Liquid level information is transferred by the passive liquid level sensor by using a liquid level nerve line which is composed of a plurality of sensing type neuron switching circuits, wherein each sensing neuron circuit is composed of a group of magnetosensitive devices and a weight resistance network. The present invention has the advantages of precise sampled data, high safety, reliability, convenient installation and maintenance and wide application scope.
Description
Passive liquid-level sensor of the present invention belongs to technical field of automatic control, particularly is a kind of Level Detection that is used for, especially for the sensor of oil level detection.
Technology and the product that adopts aspect level monitoring both at home and abroad is many at present, concludes for following several:
1, ultrasonic detector.This series products mainly is suitable for the Level Detection of broad area.Instrument is installed in the top away from liquid level, transmits and receives electromagnetic wave to liquid level, and measures electromagnetic reflection wavelength, cycle, measures the distance of liquid level apart from instrument, thereby measures liquid level.This type of production producer is all arranged at present both at home and abroad.As Chinese patent " the self-adapting ultrasonic liquid level instrument " patent No. is " 932031064 "
2, differential level sensor: along with development of semiconductor, the semiconductor surface diffusion technique has obtained widespread use in the making of sensor balanced bridge.The diffuse si differential pressure pickup is a pressure principle of utilizing liquid, detects the pressure reduction of the strong and standard atmospheric pressure of liquid base pressure at the bottom of liquid.It is to force semiconductor diffuse si film to produce the piezoelectric effect of deformation by the liquid base pressure, and obtains water level signal.This type of production producer is all arranged at present both at home and abroad.As Chinese patent " differential manometer " publication number is " C N 86105681A "
3, condenser type water (thing) level sensor: be new product, the new technology that occurred in recent years, it relies on capacitance principle and makes.Electric capacity is made of two-plate and medium, changes medium and will change electric capacity.Liquid is as the medium of electric capacity, and it is many more that liquid floods sensor, and the also many more electric capacitys of medium filling are big more.By detecting the size of electric capacity, detect liquid level.Mainly contain several productions such as West Germany, Japan, Canada, the present domestic manufacturer production that also has.
4, induction type digital water level sensor: be a new invention patented technology, it designs according to bionics and imitative neuromechanism the Chinese patent publication number for " C N 1152708A ", but it is a kind of sensor of water level signal direct sample, form by several electro-induction formula neuron circuits, every induction neuron circuit all is to be made of one group of anti-phase relatively D-flip flop and an induction electrode, each neuron circuit all is the form output digital signal with switching pulse, pass through the D-A change-over circuit again, switches digital is transformed into simulating signal output.It is that a kind of working stability is reliable, and more satisfactory level sensor has obtained widespread use at present.But he must be full of level sensor, can be used as the conductive liquid level sensor at most, for nonconducting liquid, or is afraid of that charged liquid then can not use.
" programmable water level measuring and controlling instrument " is a new invention patented technology, the Chinese patent publication number by " C N 1156245A " it be according to modern network theoretical design to the water level signal of each sensor of the control district measurement and control instrument of going the rounds detection, it is the secondary instrument of induction type digital water level sensor, with the supporting use of sensor.
Though more than several sensor technology comparative maturities owing to be subjected to the restriction of service condition, environment aspect, make their usable range be subjected to very big limitation.Particularly in inflammable and explosive liquid, such as the Level Detection of gasoline, kerosene, their use has been subjected to very big limitation.In petrochemical industry and POL depot management, original oil scale, manual measurements are still used in the most places of oil level monitoring at present.
Along with rapid development of science and technology, oil level monitoring just large-scale oil depot and petrochemical industry use in the control automatically, that the oil level detection that spreads all over cities and towns and highway aspects such as refuelling station along the line all suddenly needs is new, can satisfy the general oil level detection control control device that high-performance again can be widely applicable.
Order of the present invention must be:
1, passive detection, safe and reliable, solved the liquid level continuous detecting problem of flammable and combustible liquids.Oil level detection problem as aspects such as oil depot, refuelling stations.
2, enlarge the scope of application, solve installation, use, problem easy to maintenance.
3, reduce cost, provide a kind of simple in structure, adaptable Level Detection liquid level sensor.
Passive liquid-level sensor of the present invention is according to imitative biology. and the theoretical thinking of neural network designs.If a people stands in the water, know that also water logging is less than that position of own health even close eyes.This is that each cell is equivalent to a sensor because human body is a mass of neurocyte, and numerous neurocyte have been formed neural network, neuralward maincenter (brain) mail message.The present invention finishes the transmission of liquid level information by the magnetosensitive neural line that the neural point of several magnetosensitive senses constitutes.Each magnetosensitive induction point is to constitute the magnetic switch circuit by a cover magneto sensor, constitutes the oil level information network by several magnetic switch circuit and weighted resistance network.
Passive liquid-level sensor of the present invention, it is the bar type sensor that the induction type neuron circuit is formed.It is characterized in that it being a kind of, what liquid level signal can be by suspension magnetic induction sampling, the liquid level sensor of the non-transformer power supply of forming by several magnetic inductive neuron circuits, it can the passive data sampling, and the distant signal change is sent.Its circuit chip and metal shell are cast into one, and shell and whole the branch with liquid contacting part all adopt conductive material stainless steel or aluminum to make, and be antistatic, antirust, anticorrosion.This sensor is made up of two parts on the whole, a part is the signal data acquisition part, another part is that part is sent in the signal data change, its chip skeleton of signal data acquisition part is made with dielectric panel, the front of chip is fixed with some blocks of magnetic induction neuron circuit plates, every magnetic induction neuron circuit all is to be made of one group of magnetic induction switch circuit, each magnetic induction unit circuit all is the form output signal with switch, be fixed in the induction neuron circuit on the sensor chip skeleton front, it is spaced apart 0.5 centimetre.It is stainless solid barred body that the chip of whole signal data acquisition part becomes a shell with the insulating material casting.Its cross section is generally 20 millimeters * 38 millimeters, and length generally can be designed to 0.5-20 rice as the case may be.The suspension magnetic that is attached to liquid level changes with liquid level change responds to corresponding magnetosensitive neuron circuit.
Passive liquid-level sensor is characterized in that the most handy epoxy resin board of chip skeleton makes, and plastic insulating material casting such as available epoxy, plastics form.Shell and whole the branch with liquid contacting part all adopt stainless steel to make, and be antirust, anticorrosion, durable in use.The hydrolock lead terminal is that corresponding neuron circuit sends signal to maincenter when liquid level changes up and down with plastics and epoxy resin or the making of other insulating material.Particularly be exactly, liquid level is during near certain induced inside unit circuit, and this circuit produces switch upset, and just signal becomes " 0 " by " 1 ".Output signal becomes " 1 " by " 0 " when liquid level leaves intrinsic nerve unit circuit.Several are responded to first on-off circuit and have formed a liquid (oil) position neural line.See schematic diagram for details.(Fig. 1) some induction unit's on-off circuits and weighted resistance network have constituted the liquid level decoding circuit.Total effect of whole conversion is: the liquid level change with from low to high finally is transformed to 1-5V, signal output in the mark of 4-20 milliampere.
Passive liquid-level sensor has designed anti-power circuit especially in order to prevent the influence of static or external power supply in sensor and between sensor and the transmitter.If because of maloperation or other reason make signal wire charged, this circuit can play buffer action, and power supply is refused in oil tank (oil depot district) in addition.
Passive liquid-level sensor has different specifications, and its barred body external diameter is 20 millimeters * 30 millimeters.Length is 0.5 meter-20 meters.This sensor mainly is made up of two parts, and a part is a part of data acquisition, and another part is the signal transmitting part.(structure auspicious see Fig. 2, Fig. 3, Fig. 4)
The function of signals collecting part is that liquid level is converted to digital impedance signal.Its chip skeleton (1) is made with epoxy resin board, and the front of (or other dielectric panel) chip is fixed with some magnetic induction unit's on-off circuits (2) and weighted resistance network.The chip of making is put into stainless steel casing (3), forms with the insulating material casting then.The casting Available Material has epoxy resin, plastics etc.
Lead terminal (4) the plug-in type lead terminal that has water seal of design voluntarily.(this connector need not to do other water-proofing treatment and can drop into use in the water (oil) entirely after patching fastening getting well.
The function of signal transmitting part is that digital impedance signal is for conversion into voltage (1-5V) and electric current (4-20 milliampere) signal that meets international standard.Transmitter has power isolation circuit between the two away from (greater than 200 meters) part of data acquisition.
The main application and the advantage of invention:
1, purposes: the oil level that is used for oil, chemical industry and industrial and mining enterprises detects automatically.Be used for oil level detection and POL measuring management such as oil depot, oil tanker, refuelling station.
2. advantage:
A, passive, not have electricity, fire prevention, explosion-proof performance good.
B, digital quantity detect, the precision height, and error is little, and is reliable and stable.
C, full throw-in type, installation, use, easy to maintenance.
Most preferred embodiment: troops oil depot is with 3 meters liquid level sensors.
Sensor section is 25 millimeters * 38 millimeters, and length is 3 meters.This sensor chip skeleton (1) is made with epoxy resin board.The front of chip is fixed with 600 induction neuron circuits and corresponding weighted resistance network device, and each circuit center distance is 0.5 centimetre, and chip is made in the back casts in one 25 millimeters * 38 millimeters with epoxy resin the stainless-steel tube.The top of chip skeleton is equipped with power isolation circuit.
The lead terminal plug-in type lead terminal that has oil sealing of design voluntarily.(this connector fasteningly need not to do other anti-drain process after good and can drop in the oil entirely and use patching.
Claims (1)
1, passive liquid-level sensor of the present invention, it is the bar type sensor that the induction type neuron circuit is formed, it is characterized in that it being the liquid level sensor that a kind of liquid level signal can be powered by the non-transformer of being made up of several magnetic inductive neuron circuits of suspension magnetic induction sampling, it can be taken a sample by passive data, distant signal becomes to be sent, its circuit chip and metal shell are cast into one, shell and whole the branch with liquid contacting part all adopt conductive material stainless steel or aluminum to make, and be antistatic, antirust, anticorrosion.This sensor is made up of two parts on the whole, a part is the signal data acquisition part, another part is that part is sent in the signal data change, its chip skeleton of signal data acquisition part is made with dielectric panel, the front of chip is fixed with some blocks of magnetic induction neuron circuit plates, every magnetic induction neuron circuit all is to be made of one group of magnetic induction switch circuit, each magnetic induction unit circuit all is the form output signal with switch, be fixed in the induction neuron circuit on the sensor chip skeleton front, it is spaced apart 0.5 centimetre, it is stainless solid barred body that the chip of whole signal data acquisition part becomes a shell with the insulating material casting, its cross section is generally 20 millimeters * 38 millimeters, length generally can be designed to 0.5-20 rice as the case may be, changes with liquid level change at the suspension magnetic of liquid level and responds to corresponding magnetosensitive neuron circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104977 CN1069131C (en) | 1998-01-21 | 1998-01-21 | Passive liquid-level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104977 CN1069131C (en) | 1998-01-21 | 1998-01-21 | Passive liquid-level sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1193103A CN1193103A (en) | 1998-09-16 |
| CN1069131C true CN1069131C (en) | 2001-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98104977 Expired - Fee Related CN1069131C (en) | 1998-01-21 | 1998-01-21 | Passive liquid-level sensor |
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| Country | Link |
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| CN (1) | CN1069131C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221393A (en) * | 2010-04-13 | 2011-10-19 | 王恺 | Signal source device for accurately measuring oil quantity of oil tank of motor vehicle |
| CN102735313B (en) * | 2012-06-19 | 2014-07-30 | 郭云昌 | Method for determining middle material level curve of continuous passive nuclear material level gage |
| CN102749127A (en) * | 2012-07-23 | 2012-10-24 | 宁夏鲁西化工化肥有限公司 | Liquid level monitoring device of phosphoric acid extraction tank |
| CN107123246A (en) * | 2017-04-10 | 2017-09-01 | 劭行（苏州）智能科技有限公司 | Transformer oil surface temperature and oil condition wireless sensing system |
| CN109199119B (en) * | 2017-06-30 | 2021-06-04 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus |
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1998
- 1998-01-21 CN CN 98104977 patent/CN1069131C/en not_active Expired - Fee Related
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| CN1193103A (en) | 1998-09-16 |
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